2024-03-29T05:57:42Zhttps://repository.nwu.ac.za:443/oai/requestoai:repository.nwu.ac.za:10394/180762020-09-07T13:37:23Zcom_10394_1865col_10394_1869
Zabihi, Nima
Gouws, Rupert
11760052 - Gouws, Rupert
2016-07-27T09:58:59Z
2016-07-27T09:58:59Z
2014
Zabihi, N. & Gouws, R. 2014. Analysing two control methods of shunt active filters for unbalanced load. International journal of research in engineering and applied sciences, 2(2):48-53. [http://www.mgijournal.com/]
2249-9210
2348-1862 (Online)
http://hdl.handle.net/10394/18076
https://www.researchgate.net/publication/305412137_ANALYSING_TWO_CONTROL_METHODS_OF_SHUNT_ACTIVE_FILTERS_FOR_UNBALANCED_LOAD
A three-phase shunt active filter is used for current and/or voltage unbalance compensation. Two control schemes with two
different theory, instantaneous power theory and Generalized Fryze are considered to compensate the unbalance of current,
voltage, or both that are due to the unbalanced load. The compensation results of the different control schemes in unbalance
case are simulated and results are shown here. Different compensation objectives can be achieved, i.e., balanced and unity
power factor source current, balanced and regulated voltage, or both, by choosing appropriate control schemes by using
Instantaneous Power theory. In the case of Generalized Fryze it is seen that the current compensated by means of the
generalized Fryze currents method makes the compensated line current proportional to the corresponding phase voltage, that is,
they have the same waveform and behave like a “pure resistive” load
en
Nagpur: Yeshwantrao Chavan College of Engineering
Shunt active filter
instantaneous power theory
generalized Fryze theory
unbalanced load
Analysing two control methods of shunt active filters for unbalanced load
Article
ORIGINAL
Int jnl research engineering applied sciences-2014-2(2)-48.pdf
Int jnl research engineering applied sciences-2014-2(2)-48.pdf
application/pdf
502894
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18076/1/Int%20jnl%20research%20engineering%20applied%20sciences-2014-2%282%29-48.pdf
a6fd337e1f91ee9917c4403d2074f2b1
MD5
1
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18076/2/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
2
TEXT
Int jnl research engineering applied sciences-2014-2(2)-48.pdf.txt
Int jnl research engineering applied sciences-2014-2(2)-48.pdf.txt
Extracted text
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https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18076/5/Int%20jnl%20research%20engineering%20applied%20sciences-2014-2%282%29-48.pdf.txt
1a48a01a539e3b56cf125b88dd7229fe
MD5
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THUMBNAIL
Int jnl research engineering applied sciences-2014-2(2)-48.pdf.jpg
Int jnl research engineering applied sciences-2014-2(2)-48.pdf.jpg
IM Thumbnail
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2654
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18076/6/Int%20jnl%20research%20engineering%20applied%20sciences-2014-2%282%29-48.pdf.jpg
831a82282cca30104d022170b1c270e1
MD5
6
10394/18076
oai:v-des-dev-lnx1:10394/18076
2020-09-07 15:37:23.599
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/311052018-09-25T08:13:51Zcom_10394_1865col_10394_1869
Jacobs, Johannes A.
09273498-c66f-472e-94c9-abd205fa338e
600
Mathews, Marc J.
b4696f2d-0d45-4bdd-abb0-7ef620a3e177
600
Kleingeld, M.
fb8b8453-a30c-413d-bc7f-b398867184d3
600
25890484 - Mathews, Marc John
11962003 - Kleingeld, Marius
24153435 - Jacobs, Johannes A.
2018-09-25T08:04:49Z
2018-09-25T08:04:49Z
2018
Jacobs, J.A. et al. 2018. Failure prediction of mine de-watering pumps. Journal of failure analysis and prevention, 18(4):927-938. [https://doi.org/10.1007/s11668-018-0488-3]
1547-7029
1864-1245 (Online)
http://hdl.handle.net/10394/31105
https://doi.org/10.1007/s11668-018-0488-3
https://link.springer.com/article/10.1007/s11668-018-0488-3
The de-watering reticulation system of a deep level mine requires a network of pumps to pump water from underground to the surface. These de-watering pumps are exposed to extreme operating conditions, which can result in unacceptably short service lives. It is thus important for mining personnel to use the available tools to improve system operations and maintenance procedures. Current maintenance strategies involve reactive and preventive models, which can lead to failure creep. In order to implement proactive strategies, forecasting models are required. One of such models can be Weibull models, which has proven to be successful for many product failure mechanisms. The Weibull models have been used extensively in the reliability-engineering environment, but have not yet been implemented on a de-watering pump operating in extreme conditions on a deep level mine. A new practical method for predicting pump failure using various Weibull distribution functions was thus developed. The methodology was validated on four pumps, and it was found that the failures of new pumps were successfully predicted based on the Weibull analysis of previously failed pumps. It was also found that a quadratic relationship exists between the characteristic life of a de-watering pump and the operating depth underground. This is significant because all of the factors affecting the service life of a de-watering pump are quantified regarding only the operating depth and the characteristic life
en
Springer
Pump failure prediction
Reliability engineering
Weibull analysis
Failure prediction of mine de-watering pumps
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/31105/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/31105
oai:v-des-dev-lnx1:10394/31105
2018-09-25 10:13:51.615
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
Tk9OLUVYQ0xVU0lWRSBESVNUUklCVVRJT04gTElDRU5TRQoKQnkgc2lnbmluZyBhbmQgc3VibWl0dGluZyB0aGlzIGxpY2Vuc2UsIHlvdSAodGhlIGF1dGhvcihzKSBvciBjb3B5cmlnaHQgb3duZXIpCmdyYW50cyB0byBOb3J0aC1XZXN0IFVuaXZlcnNpdHkgKE5XVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24KaW5jbHVkaW5nIHRoZSBhYnN0cmFjdCkgd29ybGR3aWRlIGluIHByaW50IGFuZCBlbGVjdHJvbmljIGZvcm1hdCBhbmQgaW4gYW55IG1lZGl1bSwKaW5jbHVkaW5nIGJ1dCBub3QgbGltaXRlZCB0byBhdWRpbyBvciB2aWRlby4KCllvdSBhZ3JlZSB0aGF0IE5XVSBtYXksIHdpdGhvdXQgY2hhbmdpbmcgdGhlIGNvbnRlbnQsCnRyYW5zbGF0ZSB0aGUgc3VibWlzc2lvbiB0byBhbnkgbWVkaXVtIG9yIGZvcm1hdCBmb3IgdGhlIHB1cnBvc2Ugb2YgcHJlc2VydmF0aW9uLgpZb3UgYWxzbyBhZ3JlZSB0aGF0IE5XVSBtYXkga2VlcCBtb3JlIHRoYW4gb25lIGNvcHkgb2YgdGhpcyBzdWJtaXNzaW9uIGZvciBwdXJwb3NlcyBvZiBzZWN1cml0eSwKYmFjay11cCBhbmQgcHJlc2VydmF0aW9uLgoKWW91IHJlcHJlc2VudCB0aGF0IHRoZSBzdWJtaXNzaW9uIGlzIHlvdXIgb3JpZ2luYWwgd29yaywKYW5kIHRoYXQgeW91IGhhdmUgdGhlIHJpZ2h0IHRvIGdyYW50IHRoZSByaWdodHMgY29udGFpbmVkIGluIHRoaXMgbGljZW5zZS4KWW91IGFsc28gcmVwcmVzZW50IHRoYXQgeW91ciBzdWJtaXNzaW9uIGRvZXMgbm90LCB0byB0aGUgYmVzdCBvZiB5b3VyIGtub3dsZWRnZSwKaW5mcmluZ2UgdXBvbiBhbnlvbmUncyBjb3B5cmlnaHQuCgpJZiB0aGUgc3VibWlzc2lvbiBjb250YWlucyBtYXRlcmlhbCBmb3Igd2hpY2ggeW91IGRvIG5vdCBob2xkIGNvcHlyaWdodCwKeW91IHJlcHJlc2VudCB0aGF0IHlvdSBoYXZlIG9idGFpbmVkIHRoZSB1bnJlc3RyaWN0ZWQgcGVybWlzc2lvbiBvZiB0aGUgY29weXJpZ2h0IG93bmVyCnRvIGdyYW50IE5XVSB0aGUgcmlnaHRzIHJlcXVpcmVkIGJ5IHRoaXMgbGljZW5zZSwgYW5kIHRoYXQgc3VjaCB0aGlyZC1wYXJ0eSBvd25lZCBtYXRlcmlhbAppcyBjbGVhcmx5IGlkZW50aWZpZWQgYW5kIGFja25vd2xlZGdlZCB3aXRoaW4gdGhlIHRleHQgb3IgY29udGVudCBvZiB0aGUgc3VibWlzc2lvbi4KCklGIFRIRSBTVUJNSVNTSU9OIElTIEJBU0VEIFVQT04gV09SSyBUSEFUIEhBUyBCRUVOIFNQT05TT1JFRCBPUiBTVVBQT1JURUQgQlkgQU4gQUdFTkNZCk9SIE9SR0FOSVpBVElPTiBPVEhFUiBUSEFOIE5XVSwgWU9VIFJFUFJFU0VOVCBUSEFUIFlPVSBIQVZFIEZVTEZJTExFRCBBTlkgUklHSFQgT0YgUkVWSUVXCk9SIE9USEVSIE9CTElHQVRJT05TIFJFUVVJUkVEIEJZIFNVQ0ggQ09OVFJBQ1QgT1IgQUdSRUVNRU5ULgpOV1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZSBzdWJtaXNzaW9uLAphbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMgbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo=
oai:repository.nwu.ac.za:10394/182102020-09-08T12:34:48Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Dobzhanskyi, O.
Gouws, R.
Zabihi, N.
11760052 - Gouws, Rupert
24881902 - Dobzhanskyi, Oleksandr
2016-08-10T12:12:21Z
2016-08-10T12:12:21Z
2015
Dobzhanskyi, O. et al. 2015. In-line water heating system for industrial application. Proceedings of the Southern African Universities Power Engineering Conference, Jan: 450-454. [https://pdfs.semanticscholar.org/95d2/d0fbce3c0221ca09c87317b199451c8fa905.pdf]
978-0-86970-786-9
http://hdl.handle.net/10394/18210
https://pdfs.semanticscholar.org/95d2/d0fbce3c0221ca09c87317b199451c8fa905.pdf
Due to the increase of electricity prices in South Africa and the World, there exists the need for energy efficient water heating systems. The authors of this paper conducted a literature study on existing water heating systems. The study shows that there is a possibility of designing more efficient water heating system at lower cost. An in-line water heating system for industrial applications was designed and tested. Before the system was designed a Finite Element Method
analysis of the system was carried out to predict the systems’ pressure and temperature.
During a physical model test the energy consumption was measured and compared to a conventional storage water heating system. The designed in-line water heating system is shown to be more energy efficient than the conventional storage water heating system. It also had a variety of advantages such as: size, adaptability to a variety of locations, and robustness
en
Energy consumption
temperature controller
water heating system
In-line water heating system for industrial application
Presentation
ORIGINAL
Conf-Dobzhanskyi & Gouws & Zabihi-In-line_water_heating_system_for_industr-1.pdf
Conf-Dobzhanskyi & Gouws & Zabihi-In-line_water_heating_system_for_industr-1.pdf
application/pdf
300460
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18210/1/Conf-Dobzhanskyi%20%26%20Gouws%20%26%20Zabihi-In-line_water_heating_system_for_industr-1.pdf
120350ff9e6e8db64cb2b2e000883cb7
MD5
1
LICENSE
license.txt
license.txt
text/plain
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
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TEXT
Conf-Dobzhanskyi & Gouws & Zabihi-In-line_water_heating_system_for_industr-1.pdf.txt
Conf-Dobzhanskyi & Gouws & Zabihi-In-line_water_heating_system_for_industr-1.pdf.txt
Extracted text
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15965
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18210/5/Conf-Dobzhanskyi%20%26%20Gouws%20%26%20Zabihi-In-line_water_heating_system_for_industr-1.pdf.txt
3473162ae2590c90c6c9455fa0a79f07
MD5
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Conf-Dobzhanskyi & Gouws & Zabihi-In-line_water_heating_system_for_industr-1.pdf.jpg
Conf-Dobzhanskyi & Gouws & Zabihi-In-line_water_heating_system_for_industr-1.pdf.jpg
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https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18210/6/Conf-Dobzhanskyi%20%26%20Gouws%20%26%20Zabihi-In-line_water_heating_system_for_industr-1.pdf.jpg
32061202dc7f1eb8872febb5772f9700
MD5
6
10394/18210
oai:v-des-dev-lnx1:10394/18210
2020-09-08 14:34:48.766
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/180552020-09-08T10:07:47Zcom_10394_1865col_10394_1869
Gouws, R.
Dobzhanskyi, O.
11760052 - Gouws, Rupert
24881902 - Dobzhanskyi, Oleksandr
2016-07-27T06:21:17Z
2016-07-27T06:21:17Z
2015
Gouws, R. & Dobzhanskyi, O. 2015. Efficiency analysis of a three-phase power transformer. E+C spot on, 18(8):36-41. [http://www.eandcspoton.co.za/]
http://hdl.handle.net/10394/18055
http://www.eandcspoton.co.za/resources/docs/Transformers/Efficiency_analysis_of_a_three_phase_power_transformer.pdf
Transformers are key elements in the industrial processes into
which they are integrated. Reliability is crucial to ensure uninterrupted power supply to motors, furnaces and smelters used
in a wide variety of applications including primary aluminium and
steel plants, mines, pump storage power plants, rail networks etc. For
example, referring to ‘references’ in this article – in [1] authors discuss
an importance of efficient transformers feeding electric railways
en
Crown Publications
Efficiency analysis of a three-phase power transformer
Article
LICENSE
license.txt
license.txt
text/plain
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
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ORIGINAL
E+C-2015-18(8)-Gouws.pdf
E+C-2015-18(8)-Gouws.pdf
application/pdf
247729
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18055/2/E%2bC-2015-18%288%29-Gouws.pdf
dd26dbd40c60b615c242f50e39781b6e
MD5
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TEXT
E+C-2015-18(8)-Gouws.pdf.txt
E+C-2015-18(8)-Gouws.pdf.txt
Extracted text
text/plain
19744
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cdba96e89fc74e51e27195422e30f33c
MD5
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THUMBNAIL
E+C-2015-18(8)-Gouws.pdf.jpg
E+C-2015-18(8)-Gouws.pdf.jpg
IM Thumbnail
image/jpeg
3558
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198920dc8813da7c926e98dc67b7288e
MD5
6
10394/18055
oai:v-des-dev-lnx1:10394/18055
2020-09-08 12:07:47.89
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/182682016-08-17T16:17:35Zcom_10394_1865col_10394_1869
Tokarev, Andrey
a6b1503b-9126-49a3-897a-b70afb9f9fff
600
Bessarabov, Dmitri G.
e33d736a-a565-4a92-930e-03962a849b39
600
Avdeenkov, Alexander V.
34dcbca9-b924-4c6f-86a6-9aea5c0ec369
600
Langmi, Henrietta
4ef33a4b-7a96-40ab-87fd-e5da5e0d31af
600
24851396 - Tokarev, Andrey
22730389 - Bessarabov, Dmitri Georgievich
2016-08-17T06:46:55Z
2016-08-17T06:46:55Z
2015
Tokarev, A. et al. 2015. Modeling hydrogen storage in boron-substituted graphene decorated with potassium metal atoms. International journal of energy research, 39(4):524-528. [http://onlinelibrary.wiley.com/doi/10.1002/er.v39.4/issuetoc]
0363-907X
1099-114X (Online)
http://hdl.handle.net/10394/18268
http://dx.doi.org/10.1002/er.3268
http://onlinelibrary.wiley.com/doi/10.1002/er.3268/full
Boron-substituted graphene decorated with potassium metal atoms was considered as a novel material for hydrogen
storage. Density functional theory calculations were used to model key properties of the material, such as geometry,
hydrogen packing, and hydrogen adsorption energy. We found that the new material has extremely high hydrogen
storage capacity: 22.5wt%. It is explained by high-density packing of hydrogen molecules into hydrogen layers with
specific geometry. In turn, such geometry is determined by the composition and topology of the material
Department of
Science and Technology for funding through the Hydrogen
South Africa program
en
Wiley
Hydrogen storage
physical adsorption
density functional theory
Modeling hydrogen storage in boron-substituted graphene decorated with potassium metal atoms
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18268
oai:v-des-dev-lnx1:10394/18268
2016-08-17 18:17:35.207
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
Tk9OLUVYQ0xVU0lWRSBESVNUUklCVVRJT04gTElDRU5TRQoKQnkgc2lnbmluZyBhbmQgc3VibWl0dGluZyB0aGlzIGxpY2Vuc2UsIHlvdSAodGhlIGF1dGhvcihzKSBvciBjb3B5cmlnaHQgb3duZXIpCmdyYW50cyB0byBOb3J0aC1XZXN0IFVuaXZlcnNpdHkgKE5XVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24KaW5jbHVkaW5nIHRoZSBhYnN0cmFjdCkgd29ybGR3aWRlIGluIHByaW50IGFuZCBlbGVjdHJvbmljIGZvcm1hdCBhbmQgaW4gYW55IG1lZGl1bSwKaW5jbHVkaW5nIGJ1dCBub3QgbGltaXRlZCB0byBhdWRpbyBvciB2aWRlby4KCllvdSBhZ3JlZSB0aGF0IE5XVSBtYXksIHdpdGhvdXQgY2hhbmdpbmcgdGhlIGNvbnRlbnQsCnRyYW5zbGF0ZSB0aGUgc3VibWlzc2lvbiB0byBhbnkgbWVkaXVtIG9yIGZvcm1hdCBmb3IgdGhlIHB1cnBvc2Ugb2YgcHJlc2VydmF0aW9uLgpZb3UgYWxzbyBhZ3JlZSB0aGF0IE5XVSBtYXkga2VlcCBtb3JlIHRoYW4gb25lIGNvcHkgb2YgdGhpcyBzdWJtaXNzaW9uIGZvciBwdXJwb3NlcyBvZiBzZWN1cml0eSwKYmFjay11cCBhbmQgcHJlc2VydmF0aW9uLgoKWW91IHJlcHJlc2VudCB0aGF0IHRoZSBzdWJtaXNzaW9uIGlzIHlvdXIgb3JpZ2luYWwgd29yaywKYW5kIHRoYXQgeW91IGhhdmUgdGhlIHJpZ2h0IHRvIGdyYW50IHRoZSByaWdodHMgY29udGFpbmVkIGluIHRoaXMgbGljZW5zZS4KWW91IGFsc28gcmVwcmVzZW50IHRoYXQgeW91ciBzdWJtaXNzaW9uIGRvZXMgbm90LCB0byB0aGUgYmVzdCBvZiB5b3VyIGtub3dsZWRnZSwKaW5mcmluZ2UgdXBvbiBhbnlvbmUncyBjb3B5cmlnaHQuCgpJZiB0aGUgc3VibWlzc2lvbiBjb250YWlucyBtYXRlcmlhbCBmb3Igd2hpY2ggeW91IGRvIG5vdCBob2xkIGNvcHlyaWdodCwKeW91IHJlcHJlc2VudCB0aGF0IHlvdSBoYXZlIG9idGFpbmVkIHRoZSB1bnJlc3RyaWN0ZWQgcGVybWlzc2lvbiBvZiB0aGUgY29weXJpZ2h0IG93bmVyCnRvIGdyYW50IE5XVSB0aGUgcmlnaHRzIHJlcXVpcmVkIGJ5IHRoaXMgbGljZW5zZSwgYW5kIHRoYXQgc3VjaCB0aGlyZC1wYXJ0eSBvd25lZCBtYXRlcmlhbAppcyBjbGVhcmx5IGlkZW50aWZpZWQgYW5kIGFja25vd2xlZGdlZCB3aXRoaW4gdGhlIHRleHQgb3IgY29udGVudCBvZiB0aGUgc3VibWlzc2lvbi4KCklGIFRIRSBTVUJNSVNTSU9OIElTIEJBU0VEIFVQT04gV09SSyBUSEFUIEhBUyBCRUVOIFNQT05TT1JFRCBPUiBTVVBQT1JURUQgQlkgQU4gQUdFTkNZCk9SIE9SR0FOSVpBVElPTiBPVEhFUiBUSEFOIE5XVSwgWU9VIFJFUFJFU0VOVCBUSEFUIFlPVSBIQVZFIEZVTEZJTExFRCBBTlkgUklHSFQgT0YgUkVWSUVXCk9SIE9USEVSIE9CTElHQVRJT05TIFJFUVVJUkVEIEJZIFNVQ0ggQ09OVFJBQ1QgT1IgQUdSRUVNRU5ULgpOV1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZSBzdWJtaXNzaW9uLAphbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMgbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo=
oai:repository.nwu.ac.za:10394/182342020-11-04T11:48:24Zcom_10394_1865col_10394_1869
Fosso-Kankeu, E.
Mittal, H.
Mishra, Shivani B.
Mishra, Ajay K.
24838616 - Fosso-Kankeu, Elvis
2016-08-15T06:51:57Z
2016-08-15T06:51:57Z
2015
Fosso-Kankeu, E. et al. 2015. Gum ghatti and acrylic acid based biodegradable hydrogels for the effective adsorption of cationic dyes. Journal of industrial and engineering chemistry, 22:171-178. [https://doi.org/10.1016/j.jiec.2014.07.007]
1226-086X
http://hdl.handle.net/10394/18234
https://www.sciencedirect.com/science/article/pii/S1226086X14003517
https://doi.org/10.1016/j.jiec.2014.07.007
This article reports biosorption properties of Gum ghatti and acrylic acid based graft co-polymers for the adsorption of methylene blue (MB) and rhodamine B (RhB). Gg–cl–PAA removed 99% MB and 98% RhB from the respective dye solutions. Adsorption isotherm followed Langmuir isotherm with maximum adsorption capacity of 909.09 mg/g (MB) and 819.67 mg/g (RhB). Both the dyes followed pseudo second order rate equation. Eco-friendliness of Gg–cl–PAA was studied by assessing its susceptibility to biodegradation by Pseudomonas aeruginosa in phosphate buffered saline (PBS) and mineral salt medium (MSM). Gg–cl–PAA degraded faster in PBS (18%) than MSM (15.1%) using P. aeruginosa
National Research Foundation (NRF), South Africa
en
Elsevier
Gum ghatti
Pseudomonas aeruginosa
biodegradation
dyes
adsorption
Gum ghatti and acrylic acid based biodegradable hydrogels for the effective adsorption of cationic dyes
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18234
oai:v-des-dev-lnx1:10394/18234
2020-11-04 13:48:24.548
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/30222020-08-19T13:14:04Zcom_10394_1865col_10394_1869
Du Toit, Charl G.
10184600 - Du Toit, Charl Gabriel De Kock
2010-05-14T07:37:11Z
2010-05-14T07:37:11Z
2008
Du Toit, C.G. 2008. Radial variation in porosity in annular packed beds. Nuclear engineering and design, 238(11):3073-3079. [https://doi.org/10.1016/j.nucengdes.2007.12.018]
0029-5493
http://hdl.handle.net/10394/3022
https://www.sciencedirect.com/science/article/pii/S0029549308001350
https://doi.org/10.1016/j.nucengdes.2007.12.018
This paper describes the results of a study of the variation in the radial direction in the porosity of annular packed beds. A comparison is made between the predictions by a number of empirical correlations found in literature, the porosities obtained from physical experiments and the porosities obtained from the analysis of numerically generated packed beds. It is concluded that the numerical annular packed beds can be considered as acceptable representations of the actual annular packed beds. From the comparison between a number of exponential correlations proposed by various authors for the variation in the radial direction in the “averaged” porosity and the numerical results it is recommended that the correlation proposed by Hunt and Tien be used to describe the variation in the radial direction in the porosity. It is, however, also recommended that a further thorough study be conducted to develop a more detailed understanding of the porosity characteristics of annular packed beds
en
Elsevier
Radial variation in porosity in annular packed beds
Article
LICENSE
license.txt
license.txt
text/plain
1751
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0e90939092c11d20ebbf01077723c4f0
MD5
2
10394/3022
oai:v-des-dev-lnx1:10394/3022
2020-08-19 15:14:04.136
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/58912020-11-04T12:42:19Zcom_10394_1865col_10394_1869
Janse van Rensburg, Jacobus J.
Kleingeld, Marius
2012-02-29T09:49:12Z
2012-02-29T09:49:12Z
2010
Janse van Rensburg, J.J. & Kleingeld, M. 2010. A CFD method to evaluate the integrated influence of leakage and bypass flows on the PBMR reactor unit. Nuclear engineering and design, 240(11):3841-3850. [https://doi.org/10.1016/j.nucengdes.2010.08.011]
0029-5493
http://hdl.handle.net/10394/5891
https://www.sciencedirect.com/science/article/pii/S002954931000525X
https://doi.org/10.1016/j.nucengdes.2010.08.011
Elsevier
A CFD method to evaluate the integrated influence of leakage and bypass flows on the PBMR reactor unit
10394/5891
oai:v-des-dev-lnx1:10394/5891
2020-11-04 14:42:19.502
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/33052020-08-18T10:37:02Zcom_10394_1865col_10394_1869
Bunt, J.R.
Waanders, F.B.
Wagner, N.J.
10059571 - Waanders, Frans Boudewijn
2010-08-04T15:35:17Z
2010-08-04T15:35:17Z
2009
Bunt, J.R. et al. 2009. Carbon particle type characterization of the carbon behaviour impacting on a commercial-scale Sasol-Lurgi FBDB gasifier. Fuel, 88(5):771-779. [https://doi.org/10.1016/j.fuel.2008.11.021]]
http://hdl.handle.net/10394/3305
https://www.sciencedirect.com/science/article/abs/pii/S0016236108004778
https://doi.org/10.1016/j.fuel.2008.11.021
Char-form analysis, whilst not yet an ISO standard, is a relatively common characterization method applied to pulverized coal samples used by power utilities globally. Fixed-bed gasification coal feeds differ from pulverized fuel combustion feeds by nature of the initial particle size (+6 mm, −75 mm). Hence it is unlikely that combustion char morphological characterization schemes can be directly applied to fixed-bed gasifier chars. In this study, a unique carbon particle type analysis was developed to characterize the physical (and inferred chemical) changes occurring in the particles during gasification based on coal petrography and combustion char morphology. A range of samples sequentially sampled from a quenched commercial-scale Sasol-Lurgi fixed-bed dry-bottom (FBDB) Gasifier were thus analysed.
It was determined that maceral type (specifically vitrinite and inertinite) plays a pivotal role in the changes experienced by carbon particles when exposed to increasing temperature within the gasifier. Whole vitrinite particles and vitrinite bands within particles devolatilized first, followed at higher temperatures by reactive inertinite types. By the end of the pyrolysis zone, all the coal particles were converted to char, becoming consumed in the oxidation/combustion zone as the charge further descended within the gasifier.
The carbon particle type results showed that both the porous and carbominerite char types follow similar burn-out profiles. These char types formed in the slower pyrolysis region within the pyrolysis zone, increasing to around 10% by volume within the reduction zone, where 53% carbon conversion occurred. Both of these char forms were consumed by the time the charge reached the ash-grate at the base of the reactor, and therefore did not contribute to the carbon loss in the ash discharge. It would appear as if the dense char and intermediate char types are responsible for the few percent carbon loss that is consistently obtained at the gasification operations.
The carbon particle type analysis developed for coarse coal to the gasification process was shown to provide a significant insight into the behaviour of the carbon particles during gasification, both as a stand alone analysis and in conjunction with the other chemical and physical analyses performed on the fixed-bed gasifier samples
Elsevier
Coarse coal
Char morphology
Petrography
Fixed-bed gasification
Reaction zones
Carbon particle type characterization of the carbon behaviour impacting on a commercial-scale Sasol-Lurgi FBDB gasifier
Article
10394/3305
oai:v-des-dev-lnx1:10394/3305
2020-08-18 12:37:02.67
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/276912018-06-19T13:13:07Zcom_10394_1865col_10394_1869
De Medeiros, Diego
44cc2f35-2a02-4aa9-8438-d03929ecc76c
600
Waanders, F.
96a3b4d0-272b-4dfa-8efc-7410357d9c1b
600
Pires, A.
09f73282-108e-43f5-aa25-92bce831464c
600
Oliveira, M.
15e3dbb4-b93d-4a74-b8da-8c804d05fbd8
600
Lima, B.
33646d61-b307-4815-9649-5c6bb2585cb4
600
10059571 - Waanders, Frans Boudewijn
2018-06-19T13:11:57Z
2018-06-19T13:11:57Z
2016
De Medeiros, D. et al. 2016. Coal cleaning rejects and sulphide oxidation by Fenton’s reaction. 33rd Annual International Pittsburgh Coal Conference (IPCC 2016). Coal: energy, environment and sustainable development, Cape Town, South Africa, 8-12 Aug. 2016:1222-1229. [http://toc.proceedings.com/37637webtoc.pdf]
978-1-5108-5366-9
http://hdl.handle.net/10394/27691
http://toc.proceedings.com/37637webtoc.pdf
en
International Pittsburgh Coal Conference
Coal cleaning rejects and sulphide oxidation by Fenton’s reaction
Presentation
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/27691/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/27691
oai:v-des-dev-lnx1:10394/27691
2018-06-19 15:13:07.06
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/182092020-09-08T10:31:49Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Bisschoff, Wilhelm A.
Gouws, Rupert
13273523 - Bisschoff, Wilhelm Andreas
11760052 - Gouws, Rupert
2016-08-10T11:56:30Z
2016-08-10T11:56:30Z
2015
Bisschoff, W.A. & Gouws, R. 2015. Energy management system for a residential grid-tied micro-grid. Proceedings of the International Conference on the Domestic use of Energy, Cape Town, South Africa, April: 85-91. [https://doi.org/10.1109/DUE.2015.7102966]
978-0-9922041-8-1
http://hdl.handle.net/10394/18209
https://ieeexplore.ieee.org/document/7102966
https://doi.org/10.1109/DUE.2015.7102966
With the national power grid under
tremendous pressure, there are enormous pressure exerted
on residential electricity consumers to cut-back on
electricity consumption to ensure a reliable supply. This has
led to residential electricity users wanting to generate their
own electricity through solar and wind systems, more
formally known as distribution energy resources (DERs).
The possibility of DERs currently exists within the
centralized power grid, but is currently not well supported
by Eskom and local municipalities. There are currently very
little widely implemented policies regarding net-metering
and feed-in tariff structures amongst Eskom and
municipalities. Thus, excess generated energy fed into the
grid is used elsewhere without any benefit going to the
owner of the DER. By implementing an active energy
management system (EMS) alongside the grid integrated
system, electricity generated by the DER can be consumed
locally by the residential loads. The EMS achieves an
electricity consumption reduction of 23. 4 % compared to a
system with no EMS. Further results show that the EMS
compensated system shows a cost saving of R19.17 per day
which translates to a reduction of 51. 4 % compared to a
system with no EMS
en
IEEE
Energy management
micro-grids
renewable energy
Energy management system for a residential grid-tied micro-grid
Presentation
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18209/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18209
oai:v-des-dev-lnx1:10394/18209
2020-09-08 12:31:49.381
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/74522020-08-19T08:30:55Zcom_10394_1865col_10394_1869
Hattingh, Burgert B.
Everson, Raymond C.
Neomagus, Hein W.J.P.
Bunt, John R.
12979244 - Hattingh, Barend Burgert
10168249 - Everson, Raymond Cecil
20164200 - Bunt, John Reginald
12767107 - Neomagus, Hendrik Willem Johannes P.
2012-10-08T09:18:42Z
2012-10-08T09:18:42Z
2011
Hattingh, B.B. et al. 2011. Assessing the catalytic effect of coal ash constituents on the CO2 gasification rate of high ash, South African coal. Fuel processing technology, 92(10):2048-2054. [http://dx.doi.org/10.1016/j.fuproc.2011.06.003]
0378-3820
http://hdl.handle.net/10394/7452
https://www.sciencedirect.com/science/article/pii/S0378382011002220
https://doi.org/10.1016/j.fuproc.2011.06.003
The catalytic effect of inorganic species, within the ash, on the CO2 gasification of three South African coals containing similar carbon-structural properties (elemental, structural and petrographical properties) was assessed. The reactivity of the coals with a particle size between 150 and 250 μm was determined in a thermo gravimetric analyser. The reactivity was measured at temperatures between 900 and 1000 °C, pressures between 1 and 10 bar, and fractions of CO2 between 10 and 30%. For the selected coals, the reactivity decreased with ash content, and was found to be dependent on the composition of the ash. Specifically, the reactivity increased with calcium and magnesium content and alkali index.
en
Elsevier
South African coal
Characterisation
CO2 gasification
Inherent catalytic effect
Ash constituents
Assessing the catalytic effect of coal ash constituents on the CO2 gasification rate of high ash, South African coal
Article
10394/7452
oai:v-des-dev-lnx1:10394/7452
2020-08-19 10:30:55.961
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/180612020-09-08T10:16:33Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Gouws, Rupert
11760052 - Gouws, Rupert
2016-07-27T07:48:54Z
2016-07-27T07:48:54Z
2015
Gouws, R. 2015. Efficiency analysis of an induction motor with direct torque and flux control at a hot rolling mill. Journal of energy in Southern Africa, 26(3):111-115. [https://doi.org/10.17159/2413-3051/2016/v26i3a2150]
1021-447X
2413-3051 (Online)
http://hdl.handle.net/10394/18061
https://journals.assaf.org.za/index.php/jesa/article/view/2150
https://doi.org/10.17159/2413-3051/2016/v26i3a2150
This paper presents an efficiency analysis of an
induction motor with direct torque and flux control
at a hot rolling mill in South Africa. Two scenarios
were evaluated: 1) where the induction motor was
controlled at a constant speed with a variable thickness
slab; and 2) where the speed of the induction
motor was controlled according to the thickness of
the slab. Both scenarios used the speed as reference
to control the torque and flux of the induction
motor. A comparison on the energy consumption of
the induction motor for both scenarios was done by
means of a detailed simulation model. The simulation
model for this specific case study is explained in
detail. The results obtained showed an increase in
the efficiency of the induction motor from the original
system (scenario 1) to the improved system (scenario
2). Part of this paper provides an overview on
hot rolling mills
en
Energy Research Centre, University of Cape Town
Efficiency analysis
induction motor
hot rolling mill
direct torque control
flux control
Efficiency analysis of an induction motor with direct torque and flux control at a hot rolling mill
Paper presented at the Industrial & Commercial Use of Energy Conference (ICUE) 2014, 18-20 August 2014, Cape Town, South Africa. Republished here with permission
Article
ORIGINAL
Jnl energy Southern Africa-v26(3)-111.pdf
Jnl energy Southern Africa-v26(3)-111.pdf
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10394/18061
oai:v-des-dev-lnx1:10394/18061
2020-09-08 12:16:33.804
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/182672020-08-19T10:08:38Zcom_10394_1865col_10394_1869
Stander, B.F.
Everson, R.C.
Neomagus, H.W.J.P.
Van der Merwe, A.F.
Tietz, M.R.
13029355 - Stander, Barend Frederik
10168249 - Everson, Raymond Cecil
12767107 - Neomagus, Hendrik Willem Johannes P.
10212361 - Van der Merwe, Abraham Frederik
20538049 - Tietz, Max Rolf
2016-08-17T06:19:41Z
2016-08-17T06:19:41Z
2015
Stander, B.F. et al. 2015. Sulphur trioxide decomposition with supported platinum/palladium on rutile catalyst. 2. Performance of a laboratory fixed bed reactor. International journal of hydrogen energy, 40(6):2493-2499. [http://www.journals.elsevier.com/international-journal-of-hydrogen-energy/]
0360-3199
http://hdl.handle.net/10394/18267
https://www.sciencedirect.com/science/article/pii/S0360319914034843
https://doi.org/10.1016/j.ijhydene.2014.12.087
The construction, operation and experimental evaluation of a laboratory scale fixed bed reactor for the decomposition of sulphur trioxide with a supported platinum and palladium based catalyst, were undertaken. The heating was accomplished with an electrical furnace and the objective was to operate at steady state with an acceptable conversion of sulphur trioxide involving an endothermic reaction. The catalyst consisted of 0.5 wt.% platinum and 0.5 wt.% palladium on rutile and the effect of the inlet temperature and weight hourly space velocity (WHSV) was investigated. It was found that the reactor attained a steady state of operation for experiments conducted over a temperature range of 903 K and 1103 K with a sintered pelletized catalyst at a high temperature prior to reduction and reaction. Sulphur trioxide conversions equivalent to 60%, within 80% of the equilibrium value, were obtained at 1103 K over a range of weight hourly space velocities (2.6–865 h−1) involving a low gas velocity (Rep = 16) with a range of fixed bed configurations (2.5 mm diameter with 5–400 mm bed lengths)
Anglo Platinum; HYSA Infrastructure
en
Elsevier
Sulphur trioxide decomposition
platinum–palladium catalyst
fixed bed reactor performance
Sulphur trioxide decomposition with supported platinum/palladium on rutile catalyst. 2. Performance of a laboratory fixed bed reactor
Article
LICENSE
license.txt
license.txt
text/plain
1649
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10394/18267
oai:v-des-dev-lnx1:10394/18267
2020-08-19 12:08:38.627
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/77642016-04-28T09:34:55Zcom_10394_1865col_10394_1869
Kleingeld, Marius
6a2cf583-9adf-4c77-979c-24c4848c08de
-1
Janse van Rensburg, Jacobus Johannes
29c6c083-5167-4fa9-b617-4566493ec484
-1
2012-11-15T06:29:40Z
2012-11-15T06:29:40Z
2011
Janse van Rensburg, J.J. & Kleingeld, M. 2011. CFD applications in the Pebble Bed Modular Reactor Project: a decade of progress. Nuclear engineering and design, 241(9):3683-3696. [http://www.journals.elsevier.com/nuclear-engineering-and-design/]
0029-5493
1872-759x (Online)
http://hdl.handle.net/10394/7764
Of all the systems and components that have to be designed for a nuclear plant, the Reactor Unit is the most significant since it is at the very heart of the plant. At Pebble Bed Modular Reactor (Pty) Ltd. (PBMR), the design of the Reactor Unit is conducted with the aid of extensive analysis work. Due to the rapid computational improvements, the analysis capabilities have had to evolve rather significantly over the last decade. This paper evaluates the evolution of RU Computational Fluid Dynamics (CFD) analysis in particular and presents a historical timeline of the analyses conducted at PBMR. The influence of advances in the hardware and software applications on the evolution of the analysis capabilities is also discussed. When evaluating the evolution of analysis, it is important to look not only at the advances in mesh generation and the representation of the geometry, but also at the improvements regarding the physics that were included in the models. The discussion evaluates the improvements from the pre-conceptual analyses, the concept design, the basic design and finally, the detail design. It is however important to note that the focus of this research was on establishing a methodology for the integrated CFD analysis of High Temperature Reactors. It is recognized however that results from this research can currently only be used to investigate and understand trends and behaviors rather than absolute values. It was therefore required to also launch an extensive V&V program of which the focus was to verify the approach and validate the methodology that was established. The final aim was therefore to combine the research into the methodology with that of V&V in an effort to determine uncertainty bands which would enable the researcher to supply absolute results with an uncertainty value attached.
http://dx.doi.org/10.1016/j.nucengdes.2011.05.018
en
Elsevier
CFD applications in the Pebble Bed Modular Reactor Project: a decade of progress
Article
10394/7764
oai:v-des-dev-lnx1:10394/7764
2016-04-28 11:34:55.159
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/26072020-09-23T08:33:13Zcom_10394_1865col_10394_1869col_10394_1872
Van der Walt, Izak J.
Neomagus, Hein W.J.P.
Bruinsma, O.S.L.
Nel, Johann T.
Crouse, Philippus L.
12359890 - Bruinsma, Odolphus Simon Leo
12767107 - Neomagus, Hendrik Willem Johannes P.
2009-11-25T08:20:59Z
2009-11-25T08:20:59Z
2008
Van der Walt, I.L.. et al. 2008. A kinetic expression for the pyrolytic decomposition of polyterafluoroethylene. Journal of fluorine chemistry, 129(4):314-318. [https://doi.org/10.1016/j.jfluchem.2008.01.003]
0022-1139
http://hdl.handle.net/10394/2607
https://www.sciencedirect.com/science/article/abs/pii/S0022113908000286
https://doi.org/10.1016/j.jfluchem.2008.01.003
Despite the fact that the thermal decomposition of polytetrafluoroethylene has been extensively studied over the past six decades, some inconsistencies regarding the kinetic parameters, e.g. the order of the reaction, remain. Representative kinetic data are essential for practical purposes such as reactor design and scaling. In general the literature data refer to homogeneous bulk heating, whereas the case of the non-homogeneous heating of a single particle has not received attention. Data (reaction rate and pre-exponential factor) applicable to this latter case were experimentally determined from isothermal thermogravimetric analyses of the depolymerisation reaction of PTFE. The kinetic data obtained on coarse granules (800–1000 μm) are reported here. The rate law is consistent with a shrinking particle kinetic model, with chemical kinetics controlling phase-boundary movement. The mass loss rate is directly proportional to surface area. A rate law applicable to this case, and useable for geometries of arbitrary shape, is derived
en
Elsevier
PTFE
Pyrolysis
Kinetics
Decomposition
A kinetic expression for the pyrolytic decomposition of polyterafluoroethylene
Article
LICENSE
license.txt
license.txt
text/plain
1751
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7d42ee5563dbada71d117ab48f939bfc
MD5
2
10394/2607
oai:v-des-dev-lnx1:10394/2607
2020-09-23 10:33:13.887
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/181162020-09-08T09:09:33Zcom_10394_1865col_10394_1869
Gouws, Rupert
Nieuwoudt, Abrie
11760052 - Gouws, Rupert
2016-08-01T10:03:29Z
2016-08-01T10:03:29Z
2012
Gouws, R. & Nieuwoudt, A. 2012. Design and cost analysis of an automation system for swimming pools. Vector: 74-80, Jul. [http://www.ee.co.za/wp-content/uploads/legacy/Vector%202012/nwu_design%20and%20cost.pdf]
1818-2119
http://hdl.handle.net/10394/18116
http://www.ee.co.za/wp-content/uploads/legacy/Vector%202012/nwu_design%20and%20cost.pdf
A low-cost automation system to minimise energy consumption
of circulation pumps and to regulate the chemical
composition of the water in swimming pools
This paper was presented at the
Domestic Use of Energy conference
and is published here with permission
en
EE Publishers
Design and cost analysis of an automation system for swimming pools
Article
ORIGINAL
Vector-2012-July-74.pdf
Vector-2012-July-74.pdf
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Vector-2012-July-74.pdf.txt
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10394/18116
oai:v-des-dev-lnx1:10394/18116
2020-09-08 11:09:33.333
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/33042016-04-28T09:34:24Zcom_10394_1865col_10394_1869
Schutte, Abraham Jacobus
17ab4f75-4cc5-456c-8040-2ce45cc6dc3f
-1
Helberg, Albert
454aa5f5-28fe-46fa-8765-fcbdc7dae310
-1
2010-08-04T15:35:17Z
2010-08-04T15:35:17Z
2008
SCHUTTE, A.J. & HELBERG, A. 2008. A study of the effect of MPLS on Quality of Service in Wireless LANS. SAIEE (South African Institude of Electrical Engineers)Africa Research Journal, 99(3):70-76, Sept. [http://www.saiee.org.za/index.php?pageID=105][http://www.saiee.org.za/index.php]
http://hdl.handle.net/10394/3304
This a Conference Paper by Schutte, Abraham Jacobus & Helberg, Albert. It was submitted on 30 April, 2006. The author would like to thank the Telkom Centre of Excellence department for their financial support. Jaco Schutte studies at the Potchefstroom Campus of the North-West University
OPNET Technologies
Conference Paper
A study of the effect of MPLS on Quality of Service in Wireless LANS
10394/3304
oai:v-des-dev-lnx1:10394/3304
2016-04-28 11:34:24.627
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/58892020-08-18T09:46:58Zcom_10394_1865col_10394_1869
Enslin, F.
Van der Mey, L.
Waanders, F.
10059571 - Waanders, Frans Boudewijn
20327579 - Enslin, Frederick Hendrik
13207245 - Van der Mey, Laura Elizabeth
2012-02-29T09:49:11Z
2012-02-29T09:49:11Z
2010
Enslin, F.H. et al. 2010. Acid leaching of heavy metals from bentonite clay, used in the cleaning of acid mine drainage. Journal of the South African Institute of Mining and Metallurgy, 110:187-191. [http://www.scielo.org.za/pdf/jsaimm/v110n4/06.pdf]
0038-223X
http://hdl.handle.net/10394/5889
http://www.scielo.org.za/pdf/jsaimm/v110n4/06.pdf
Heavy metals and sulphates in acid mine drainage (AMD) can be
adsorbed onto bentonite clay, leaving clean water and a heavy
metal loaded clay precipitate as products. Due to the toxicity of
heavy metals, the clay could not be disposed of safely in the past. A
method was thus required to remove the heavy metal content from
the clay. Acid leaching was proposed to liberate the heavy metals
from the loaded clay. Sulphuric, nitric and hydrochloric acid were
considered as lixiviants. Loaded clay samples were leached over a
range of pH values from 1 to 3.5 to identify an optimum leaching
condition. From the results it was found that metals can be
recovered from loaded bentonite clay by means of acid leaching and
the optimum pH for heavy metal liberation was found to be 2.5,
with uranium as an exception, being optimally leached at a pH of 3.
This allows for the possibility of selective leaching. Furthermore, Xray diffraction analyses indicated that the clay structure did not
deteriorate significantly during acid leaching, suggesting that the
bentonite could be reused.
The treatment of AMD with bentonite clay, and subsequent acid
leaching of the clay, is a sustainable solution, and current outcomes
could possibly lead to industrial implementation of the process
during water purifying and metal recovery from waste streams
Heavy metals and sulphates in acid mine drainage (AMD) can be
adsorbed onto bentonite clay, leaving clean water and a heavy
metal loaded clay precipitate as products. Due to the toxicity of
heavy metals, the clay could not be disposed of safely in the past. A
method was thus required to remove the heavy metal content from
the clay. Acid leaching was proposed to liberate the heavy metals
from the loaded clay. Sulphuric, nitric and hydrochloric acid were
considered as lixiviants. Loaded clay samples were leached over a
range of pH values from 1 to 3.5 to identify an optimum leaching
condition. From the results it was found that metals can be
recovered from loaded bentonite clay by means of acid leaching and
the optimum pH for heavy metal liberation was found to be 2.5,
with uranium as an exception, being optimally leached at a pH of 3.
This allows for the possibility of selective leaching. Furthermore, Xray diffraction analyses indicated that the clay structure did not
deteriorate significantly during acid leaching, suggesting that the
bentonite could be reused.
The treatment of AMD with bentonite clay, and subsequent acid
leaching of the clay, is a sustainable solution, and current outcomes
could possibly lead to industrial implementation of the process
during water purifying and metal recovery from waste streams
SAIMM
Acid mine drainage
Bentonite
Heavy metals
Acid leaching of heavy metals from bentonite clay, used in the cleaning of acid mine drainage
10394/5889
oai:v-des-dev-lnx1:10394/5889
2020-08-18 11:46:58.497
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/79612016-04-28T09:34:54Zcom_10394_1865col_10394_1869
Liebenberg, Leon
d2b3b2aa-857d-4cf5-a076-e94d9f75a040
-1
Mathews, Edward Henry
e70a934c-1075-432f-a8bd-9d22b6122452
-1
2013-01-28T07:24:34Z
2013-01-28T07:24:34Z
2012
Mathews, E.H. & Liebenberg, L. 2012. A practical quantification of blood glucose production due to high-level chronic stress. Stress and health, 28(4):327-332. [http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291532-2998]
1532-3005
1532-2998 (Online)
http://hdl.handle.net/10394/7961
Blood glucose (BG) is the primary metabolic fuel for, among others, cancer cell progression, cardiovascular disease and inflammation. Stress is an important contributor to the amount of BG produced especially by the liver. In this paper, we attempt to quantify the BG production due to chronic (in the order of weeks) high-level psychological stress in a manner that a lay person will understand. Three independent approaches were used. The first approach was based on a literature survey of stress hormone data from healthy individuals and its subsequent mathematical manipulation. The next approach was a deductive process where BG levels could be deduced from published stress data of large cardiovascular clinical trials. The third approach used empirical BG data and a BG simulation model. The three different methods produced an average BG increase of 2.2-fold above basal for high levels of stress over a period of more than a day. The standard deviation normalized to the average value was 4.5%.
http://dx.doi.org/10.1002/smi.2415
en
Wiley
High-level chronic stress
practical indicative quantification
blood glucose production
A practical quantification of blood glucose production due to high-level chronic stress
Article
10394/7961
oai:v-des-dev-lnx1:10394/7961
2016-04-28 11:34:54.62
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/276882020-08-18T10:06:11Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
De Leão, Felipe B.
Waanders, F.
Taffarel, S.
Sampaio, C.
Lima, B.
10059571 - Waanders, Frans Boudewijn
2018-06-19T12:53:37Z
2018-06-19T12:53:37Z
2016
De Leão, F.B. et al. 2016. Multifaceted nanominerals and ultrafine particles in phosphogypsum: a by-product of coal cleaning rejects. 33rd Annual International Pittsburgh Coal Conference (IPCC 2016). Coal: energy, environment and sustainable development, Cape Town, South Africa, 8-12 Aug. 2016:504. [http://toc.proceedings.com/37637webtoc.pdf]
978-1-5108-5366-9
http://hdl.handle.net/10394/27688
http://toc.proceedings.com/37637webtoc.pdf
en
International Pittsburgh Coal Conference
Multifaceted nanominerals and ultrafine particles in phosphogypsum: a by-product of coal cleaning rejects
Presentation
LICENSE
license.txt
license.txt
text/plain
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10394/27688
oai:v-des-dev-lnx1:10394/27688
2020-08-18 12:06:11.782
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/190212020-08-18T13:53:51Zcom_10394_1865col_10394_1869
Arif, S.
Branken, D.J.
Everson, R.C.
Neomagus, H.W.J.P.
Le Grange, L.A.
Arif, A.
12767107 - Neomagus, Hendrik Willem Johannes P.
10168249 - Everson, Raymond Cecil
12763764 - Branken, David Jacobus
10066578 - Le Grange, Louis Adolf
25283448 - Arif, Samrana
2016-10-11T11:10:10Z
2016-10-11T11:10:10Z
2016
Arif, S. et al. 2016. CFD modeling of particle charging and collection in electrostatic precipitators. Journal of electrostatics, 84:10-22. [https://doi.org/10.1016/j.elstat.2016.08.008]
0304-3886
http://hdl.handle.net/10394/19021
https://www.sciencedirect.com/science/article/pii/S0304388616301139
https://doi.org/10.1016/j.elstat.2016.08.008
A CFD model was developed to describe the particle laden gas flow through an ESP, particle charging and collection. The corona discharge was modeled using the open source software OpenFOAM to solve the Poison and charge conservation equations, and results were entered using user-defined field functions in the commercial CFD software STAR-CCM+. The gas flow, EHD flow, particle charging and dynamics were modeled using STAR-CCM+. The developed CFD model allows for direct solution of the drift and diffusional flux of gas ions. The influence of the various ESP dimensions, operating parameters and ash properties on the collection efficiency are reported
en
Elsevier
CFD model
Electrostatic precipitation (ESP)
Electro-hydrodynamic (EHD) flow
Permittivity
Particle charging
ESP collection efficiency
CFD modeling of particle charging and collection in electrostatic precipitators
Article
LICENSE
license.txt
license.txt
text/plain
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10394/19021
oai:v-des-dev-lnx1:10394/19021
2020-08-18 15:53:51.948
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/136202018-03-08T13:00:18Zcom_10394_10929com_10394_1865col_10394_10936col_10394_1869col_10394_1872
Aditi Sharma, Grover
b1b86580-d4ec-40b2-b888-67b852bc647e
Calteaux, Caren
9ac202d8-7145-42ca-93ab-906f173bc453
Barnard, Etienne
161d52de-8d72-483b-b44d-610a7b318b73
Van Huyssteen, Gerhard
68cafb34-21b0-4f85-84ac-12978e2f7d5c
21021287 - Barnard, Etienne
10215484 - Van Huyssteen, Gerhardus Beukes
2015-03-30T07:13:36Z
2015-03-30T07:13:36Z
2012
Grover, A.S. & Barnard, E., et al. 2012. A voice service for user feedback on school meals. In: Proceedings of the 2nd ACM Symposium on Computing for Development, 11-12 March 2012.
978-1-4503-1262-2
http://hdl.handle.net/10394/13620
Proceedings of the 2nd ACM Symposium on Computing for Development, New York, USA, 11-12 March 2012
Research using voice-based services as a technology platform for providing information access and services within developing world regions has shown much promise. The results for design and deployment of such voice-based services have varied depending on the application domain, user community and context. In this paper the authors describe their work on developing a voice-based service for obtaining feedback from school children, a previously unexplored user community. Through a user study, focus group discussions and observations of learners’ interaction with multiple design prototype versions, they investigated several factors around input modality preference, language preference, performance and overall user experience. Whilst no significant differences were observed for performance across the prototypes, there were strong preferences for speech (input modality) and English (language). Focus group discussions revealed rich information on learner’s perceptions around trust, confidentiality and general system usage. They highlight several design changes made and provide further recommendations on designing for this user community.
http://dx.doi.org/10.1145/2160601.2160619
http://dl.acm.org/citation.cfm?id=2160619
http://dl.acm.org/citation.cfm?id=2160601
en
ACM
Voice user interface
Dual tone multi frequency
DTMF
Speech interface
Children's technology usage
Developing world technology usage
School meals
Mobile voice-based services
Interactive voice response
IVR
A voice service for user feedback on school meals
Other
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/13620/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
METADATA
2012-grover-school-meals.pdf
2012-grover-school-meals.pdf
A voice service for user feedback on school meals
application/pdf
353061
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/13620/2/2012-grover-school-meals.pdf
f9913417d2fb634496a436ca851e2a14
MD5
2
10394/13620
oai:v-des-dev-lnx1:10394/13620
2018-03-08 15:00:18.098
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/182552020-08-19T08:42:25Zcom_10394_1865col_10394_1869
Okolo, Gregory N.
Neomagus, Hein W.J.P.
Everson, Raymond C.
Roberts, Mokone J.
Bunt, John R.
22006303 - Okolo, Gregory Nworah
12767107 - Neomagus, Hendrik Willem Johannes P.
10168249 - Everson, Raymond Cecil
22061452 - Roberts, Mokone Joseph
20164200 - Bunt, John Reginald
2016-08-16T11:20:33Z
2016-08-16T11:20:33Z
2015
Okolo, G.N. et al. 2015. Chemical–structural properties of South African bituminous coals: insights from wide angle XRD–carbon fraction analysis, ATR–FTIR, solid state 13C NMR, and HRTEM techniques. Fuel, 158:779-792. [https://doi.org/10.1016/j.fuel.2015.06.027]
0016-2361
1873-7153 (Online)
http://hdl.handle.net/10394/18255
https://www.sciencedirect.com/science/article/pii/S0016236115006079
https://doi.org/10.1016/j.fuel.2015.06.027
The chemical–structural properties of four South African bituminous coals were investigated using wide angle X-ray diffraction–carbon fraction analysis (WAXRD–CFA), attenuated total reflection Fourier transform infra-red spectroscopy (ATR–FTIR), solid state 13C nuclear magnetic resonance spectroscopy (ss 13C NMR), and high resolution transmission electron microscopy (HRTEM). The aromaticity of the samples determined by solid state 13C NMR ranged from 0.74 to 0.87 and compared well with the WAXRD–CFA results (0.73–0.86). WAXRD–CFA, ATR–FTIR and 13C NMR data showed that the lower iso-rank coal samples contained more aliphatic moieties; while the higher rank sample contained higher fractions of polyaromatic moieties and saturated long chain hydrocarbons. The lattice parameters determined from WAXRD–CFA show that lower rank coals investigated are structurally less well-ordered than the higher rank coal. Also, its fringes were quantified as having the greatest preferential alignment of the coals examined. HRTEM aromatic fringe image analysis revealed that the carbon lattice of the samples consist of aromatic fringes of varying lengths, L (3 Å ⩽ L ⩽ 95 Å), which corresponded to a molecular weight distribution ranging from 75 to 1925 amu, assuming circular catenation. The coal with the highest volatile matter yield was found to exhibit a higher frequency of lower molecular weight fringes; while the higher rank coal possessed the most higher molecular weight fringes. The average molecular weights determined for the samples from 13C NMR varied between 504 and 544 amu; and compared well with the values from HRTEM aromatic fringe image analysis data. Thus, there was good agreement and consistency between the different techniques. It was demonstrated that, for the characterisation methods used in this study; that vitrinite reflectance impacts more on the chemical–structural properties of these coals than maceral composition does
South African Research Chairs Initiative of the Department of
Science and Technology and National Research Foundation of
South Africa (Chair Grant No.: 86880, UID 85643, Grant No.:
85632)
en
Elsevier
Chemical–structural properties
WAXRD–CFA
ATR–FTIR
solid state 13C NMR
HRTEM
Chemical–structural properties of South African bituminous coals: insights from wide angle XRD–carbon fraction analysis, ATR–FTIR, solid state 13C NMR, and HRTEM techniques
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18255/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18255
oai:v-des-dev-lnx1:10394/18255
2020-08-19 10:42:25.173
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/189292016-10-03T06:44:56Zcom_10394_1865col_10394_1869
Matjie, Ratale
d049a50f-11ac-4ee7-a97e-0db3425e16b3
600
Bunt, John R.
43ba2cde-81f4-4dea-87b4-b15db5065206
600
Zhang, Shuai
f1af8814-d6e4-4dbd-ba8d-952b2faddbfc
600
Zhao, Qi
6abd18b1-838d-4ab4-b613-050ab40ca292
600
Mabuza, Nhlanganiso
f2bd5d31-1bc6-44bd-a91c-29ef2379f8ef
600
21166625 - Matjie, Ratale Henry
20164200 - Bunt, John Reginald
2016-09-30T11:31:26Z
2016-09-30T11:31:26Z
2016
Matjie, R. et al. 2016. Tailored surface energy of stainless steel plate coupons to reduce the adhesion of aluminium silicate deposit. Fuel, 181:573-578. [http://www.journals.elsevier.com/fuel/]
0016-2361
1873-7153 (Online)
http://hdl.handle.net/10394/18929
http://dx.doi.org/10.1016/j.fuel.2016.04.105
http://www.sciencedirect.com/science/article/pii/S0016236116302708
Fouling in heat exchangers not only reduces heat transfer performance significantly, but also causes considerable pressure drop, resulting in higher pumping requirements. It would be much more desirable if surfaces which are inherently less prone towards fouling could be developed. In this paper, autocatalytic Nickel–Phosphorus–Polytetrafluoroethylene (Ni–P–PTFE) composite coatings and modified diamond-like carbon (DLC) coatings were applied to the coupons of the 316L stainless steel plates. The effects of surface energies of the coatings on the adhesion of aluminium silicate fouling were investigated and the best surface energy for which the fouling adhesion is lowest was obtained. The experimental results show that the coating with the most favourable surface energy reduced the adhesion of aluminium silicate deposit by 97%, compared with uncoated stainless steel plate coupons. The anti-fouling mechanism of the coatings was explained with the extended Deryagin, Landau, Verwey and Overbeek (DLVO) theory
en
Elsevier
Ni–P–PTFE coating
DLC coating
fouling
aluminium silicate
stainless steel
surface energy
Tailored surface energy of stainless steel plate coupons to reduce the adhesion of aluminium silicate deposit
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18929/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18929
oai:v-des-dev-lnx1:10394/18929
2016-10-03 08:44:56.022
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/27752020-11-04T13:58:58Zcom_10394_1865col_10394_1869
Van Dyk, J.C.
Waanders, F.B.
Hack, K.
10059571 - Waanders, Frans Boudewijn
2010-02-01T07:03:26Z
2010-02-01T07:03:26Z
2008
Van Dyk, J.C. et al. 2008. Behaviour of calcium-containing minerals in the mechanism towards in situ CO2 capture during gasification. Fuel, 87(12):2388-2393. [https://doi.org/10.1016/j.fuel.2008.03.015]
0016-2361
http://hdl.handle.net/10394/2775
https://www.sciencedirect.com/science/article/pii/S0016236108001129
https://doi.org/10.1016/j.fuel.2008.03.015
Mineral matter transformation and the behavior of mineral matter in the coal during gasification, provide more information on the suitability of a specific coal source for combustion or gasification purposes. Therefore, the chemistry and mineral interactions have to be understood in order to determine the suitability for fixed bed gasification purposes with regards to mineral matter transformations and slagging properties.
Although a suite of minerals important for the gasification process were identified [Van Dyk JC, Melzer S, Sobiecki A. Mineral matter transformations during Sasol-Lurgi fixed bed dry bottom gasification – utilization of HT-XRD and FactSage modelling. Minerals Engineering 2006; 19: 1126–35], some of the minerals, i.e. anorthite and calcite, with a specific behavior at different concentrations in the mineral structure and the transformation thereof was not studied and highlighted in detail. A number of other researchers [Reifenstein AP, Kahraman H, Coin CDA, Calos NJ, Miller G, Uwins P. Behavior of selected minerals in an improved ash fusion test: quartz, potassium feldspar, sodium feldspar, kaolinite, illite, calcite, dolomite, siderite, pyrite and apatite. Fuel 1999; 78: 1449–61], [Kondratiev A, Jaks E. Predicting coal ash slag flow characteristics (viscosity model for the Al2O3–CaO–‘FeO’–SiO2 system). Fuel 2001; 80: 1989–2000] and [Kondratiev A, Jak E. Applications of the coal ash slag viscosity model for the slagging gasification technologies (viscosity model in the Al2O3–CaO–‘FeO’–SiO2 system), 18th Pittsburgh Coal Conference, Newcastle, Australia, December 2001]) also did not investigate these gasification changes and mineralogical deformation during specific gasification conditions in detail.
The principle aim of this paper is to identify the role of Ca-containing mineral species towards the in situ capture of CO2 during gasification, as well as understanding the chemistry and interpret the mechanism of CO2 capture by means of high temperature X-ray diffraction (HT-XRD), in combination with FactSage modeling. The CaO content of a South African and another coal source investigated in the present study, were 6 mass% and 30 mass% respectively. The basic components present in the coal, or specifically CaO, only act as a fluxing component up to a specific percentage, where after the ash fusion temperature starts to increase again. At this turning point the (Si+Al):Ca molar mass ratio is 2.75, which implies that after the turning point, the formation of anorthite is maximized and can thereafter only remain at the same level.
The anorthite formation, when the Ca content increases, follows the inverse trend of the ash flow temperature prediction curve with the coal containing 6% CaO. The decrease in anorthite formation, with increasing Ca content, after the turning point in the graph, can be explained by the fact that more of the crystalline phase becomes a liquid (slag), and thus also the increase in the amount CaO in the slag will be observed. At the turning point, it is also interesting to note the stabilisation of the amount of other Ca-containing species. These are the minerals that are responsible and available for the mechanism where CO2 can be captured on Ca to form CaCO3. The formation of CaCO3 can also be observed from the turning point where the (Si+Al):Ca molar mass ratio is <2.75, which corresponds with the formation of other Ca-containing species.
Thermodynamic modeling with FactSage results indicated that anorthite can only form to the point where the (Si+Al):Ca molar mass ratio is >2.75. Anorthite (CaSi2Al2O8) forms within the gasification zone and all non-reacted Ca react with CO2 to form CaCO3 further down in the combustion zone
en
Elsevier
CO2 capture
Ca-content
Gasification
Mineral matter
Behaviour of calcium-containing minerals in the mechanism towards in situ CO2 capture during gasification
Article
LICENSE
license.txt
license.txt
text/plain
1751
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/2775/2/license.txt
ec9c1f8b1b9ea7b13c2bf7134b357628
MD5
2
10394/2775
oai:v-des-dev-lnx1:10394/2775
2020-11-04 15:58:58.454
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/189842016-10-11T06:27:51Zcom_10394_1865col_10394_1869
Ntwampe, I.O.
76089338-2598-4789-b233-6ff99f1d449e
600
Waanders, F.B.
a6e30a9a-f9aa-4d3c-acad-de50400935da
600
Bunt, J.R.
110b401a-57f3-46a0-bb80-ede9f10fbbaf
600
10059571 - Waanders, Frans Boudewijn
20164200 - Bunt, John Reginald
2016-10-10T10:32:17Z
2016-10-10T10:32:17Z
2016
Ntwampe, I.O. et al. 2016. Reactivity of Fe salts in the destabilization of acid mine drainage employing mixing and shaking techniques without pH adjustment. International journal of mineral processing, 146:65-73. [http://www.journals.elsevier.com/international-journal-of-mineral-processing/]
0301-7516
http://hdl.handle.net/10394/18984
http://dx.doi.org/10.1016/j.minpro.2015.11.009
http://www.sciencedirect.com/science/article/pii/S0301751615300491
Ferric chloride and Fe-sulphates are commonly Fe-salts used in water treatment, and the iron ionizes to form Fe3 + or Fe2 + when reduction occurs. A volume of 200 mL acid mine drainage (AMD) sample was poured into five 500 mL glass beakers or Erlenmeyer flasks and dosed with salts such as FeCl3, Fe2(SO4)3 and FeSO4 respectively. The samples were treated in a jar test and shaken respectively, then settled for 1 h, after which the pH, conductivity and turbidity were then measured. Another similar set of experiments was conducted in a jar test where the jars were rotated at 100, 150, 200, 250 and 300 rpm for 2 min, after which the samples settled for 1 h and the same measurements were conducted. A third, similar set of experiments was conducted at a rotating speed of 250 rpm for 30, 60 and 90 s, and then settled for 1 h and the same measurements were conducted. Although the Fe-salts are both divalent and trivalent, the turbidity removal values of the treated AMD samples do not differ significantly. The turbidity in the AMD samples with 90 s rapid mixing is slightly higher than in the samples with 30 and 60 rapid mixing. The SEM image of the sample with 90 s rapid mixing showed scattered agglomerates which indicates that rupturing occurred. Although there was no pH adjustment done on AMD sample before treatment, the pH and conductivity showed a direct relationship with the turbidity
en
Elsevier
AMD
treatment
pH
conductivity
agglomerates
Reactivity of Fe salts in the destabilization of acid mine drainage employing mixing and shaking techniques without pH adjustment
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18984/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18984
oai:v-des-dev-lnx1:10394/18984
2016-10-11 08:27:51.673
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/29142020-08-18T11:01:18Zcom_10394_1865col_10394_1869
Bunt, J.R.
Waanders, F.B.
10059571 - Waanders, Frans Boudewijn
2010-04-14T07:13:36Z
2010-04-14T07:13:36Z
2008
Bunt, J.R. & Waanders, F.B. 2008. Identification of the reaction zones occurring in a commercial-scale Sasol-Lurgie FBDB gasifier. Fuel, 87(10-11):1814-1823. [https://doi.org/10.1016/j.fuel.2007.11.012]
0016-2361
http://hdl.handle.net/10394/2914
https://www.sciencedirect.com/science/article/abs/pii/S0016236107005145
https://doi.org/10.1016/j.fuel.2007.11.012
Gasification behaviour is particle dependent, whilst gasifier (reactor) behaviour is an averaging process of individual responses of each particle. It was hypothesized, that if it were possible to extract and analyze particles from different reaction zones within a gasifier, it may be likely to enhance the understanding of the contribution that these particles make towards gasification. This better understanding of the particle-type compositional responses could act as an enabler to further manipulate and improve gasifier performance.
The primary focus of this study was to evaluate a sequential (axial) sampling “turn-out” methodology of a quenched fixed-bed commercial-scale Sasol–Lurgi gasifier, in order to present samples that accurately describe operational aspects occurring in the reaction zones within the reactor. Characterization of the chemical properties of the sample increments were expected to deliver distinct profiles of the drying, pyrolysis, reduction and combustion (ash-bed) zones, which could be used to advance the kinetic modeling capability of the process. In order to interpret the coal property transformational behaviour occurring within the commercial-scale gasifier, the proximate, Fischer tar, ultimate, and coal char CO2 reactivity analysis were conducted.
The pyrolysis zone was found to be the largest reaction zone situated below the drying zone within the gasifier, followed by the reduction zone, and combustion (ash-bed) zones. Whilst the boundaries of the pyrolysis zone were very clearly defined by the residual volatile matter distribution profile, distinctive regional overlap with a “slow pyrolysis with gasification” region was observed in the bottom half of the pyrolysis zone, above which a “rapid de-volatilization” region existed. The reduction zone was found to also exhibit an overlap in zonal fronts, i.e. a gasification region occurred below the pyrolysis zone and co-existed in equal proportions, with an oxidation frontal region occurring above the combustion zone. The combustion zone was found to be very shallow, below which the ash-bed region existed.
The findings clearly suggest that text book pictures showing axially-depicted reaction zones occurring within the fixed-bed gasifier, i.e. drying, pyrolysis, gasification and combustion, inadequately describe the “real” situation and in practice, overlap of reaction regions within zones indeed also transpire
en
Elsevier
Sasol-Lurgi fixed-bed dry bottom gasification
“Turn-out” sampling methodology
Reaction zones
Identification of the reaction zones occurring in a commercial-scale Sasol-Lurgie FBDB gasifier
Article
LICENSE
license.txt
license.txt
text/plain
1751
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/2914/2/license.txt
94cb7d3b41f5c0b5b243ea504b6bee68
MD5
2
10394/2914
oai:v-des-dev-lnx1:10394/2914
2020-08-18 13:01:18.757
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/77412020-06-25T08:34:53Zcom_10394_1865col_10394_1869
Mathews, Edward Henry
Liebenberg, Leon
Pelzer, Ruaan
10477438 - Mathews, Edward Henry
12850071 - Liebenberg, Leon
12674818 - Pelzer, Ruaan
2012-11-08T08:39:36Z
2012-11-08T08:39:36Z
2011
Mathews, E.H. et al. 2011. High-glycolytic cancers and their interplay with the body's glucose demand and supply cycle. Medical hypotheses, 76(2):157-165. [https://doi.org/10.1016/j.mehy.2010.09.006]
0306-9877
1532-2777 (Online)
http://hdl.handle.net/10394/7741
https://www.sciencedirect.com/science/article/abs/pii/S0306987710003609
https://doi.org/10.1016/j.mehy.2010.09.006
Many difficult-to-treat solid cancer tumours and metastases have high-glucose uptake, usually under hypoxic conditions. Hypoxic tumours suppress the immune system and are insensitive to traditional chemoradiotherapies. The only therapy usually available is surgical resection. However, with widespread metastases, surgery often becomes unviable. Surgery in itself can also result in metastasis. The need for investigating adjuvant treatments is obvious. Here we investigate whether the high-glucose uptake of hypoxic tumours could lead to such a treatment. Before any treatment can be hypothesised, it is crucial to understand how this glycolytic cancer phenotype fits in with the normal body’s blood glucose cycle. The brain creates the healthy body’s largest demand for blood glucose (BG) and ensures a very high level of control on in vivo supply. It is hypothesised that, through somatic evolution, high-glycolytic cancer cells opportunistically tap into this very stable energy environment. It is shown that therapies which target the glycolytic cancers’ high BG needs cannot be developed without addressing the brain’s energy needs. Based on this knowledge, and to initiate thinking on potential BG therapies, a first attempt is made at hypotheses for potential control of the in vivo brain demand as well as the available in vivo BG. The aim is to adversely affect primary as well as metastatic tumours without damaging brain and innocent bystander cells.
DOI: http://dx.doi.org/10.1016/j.mehy.2010.09.006
en
Elsevier
High-glycolytic cancers and their interplay with the body's glucose demand and supply cycle
Article
10394/7741
oai:v-des-dev-lnx1:10394/7741
2020-06-25 10:34:53.628
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/74152016-04-28T09:34:55Zcom_10394_1865col_10394_1869
Liebenberg, Leon
d2b3b2aa-857d-4cf5-a076-e94d9f75a040
-1
Mathews, Edward Henry
e70a934c-1075-432f-a8bd-9d22b6122452
-1
Pelzer, Ruaan
efac379e-a89d-4c39-8ec9-a9ae018c0b70
-1
2012-10-02T06:01:05Z
2012-10-02T06:01:05Z
2011
Pelzer, R. et al. 2011. Prelimanary application of a new Bolus Insulin model for Type 1 Diabetes. Diabetes technology & therapeutics, 13(5):527-535. [http://www.liebertpub.com/overview/diabetes-technology-and-therapeutics]
1520-9156
1557-8593 (Online)
http://hdl.handle.net/10394/7415
Previous work derived a theoretically rigorous bolus insulin model. It was shown that the new model predicts insulin response of subjects without diabetes substantially better than the carbohydrate counting method (CHOcm). As most individuals with type 1 diabetes use the CHOcm, this article investigates if the new model can be applied to them.
en
Mary Ann Liebert
Prelimanary application of a new Bolus Insulin model for Type 1 Diabetes
Article
10394/7415
oai:v-des-dev-lnx1:10394/7415
2016-04-28 11:34:55.755
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/167182016-04-28T09:34:45Zcom_10394_1865col_10394_1869
Plessis, L.
40ce9303-cb6a-4485-96fd-fa83aeaef0c9
-1
Liebenberg, L.
c9e26126-b9ea-4e85-85bd-27385e53c216
-1
Nokes, W.
65c236be-8fd3-4a24-a31f-70807f5011e7
-1
Mahdavi, M.
9714142a-438b-431e-897e-281f7eab39cf
-1
Burmas, N.
90f6c863-fc9d-4daf-94c8-efb656d203af
-1
Holland, T.
4e60bbfe-d421-4207-8564-c6fe0b722b60
-1
Harvey, J.
e74fcdfe-4317-4612-9104-40985486b796
-1
12850071 - Liebenberg, Leon
2016-03-18T12:58:55Z
2016-03-18T12:58:55Z
2013
Plessis, L. et al. 2013. Case study for evaluating benefits of pavement research: final results. Transportation research record, 2367:63-75. [http://www.trb.org/Finance/TRRJournalOnline1.aspx]
0361-1981
2169-4052 (Online)
http://hdl.handle.net/10394/16718
Heavy-duty pavement innovations developed through research for a major rehabilitation project in California were evaluated. The performance benefits of the innovations were examined, and the economic benefits from implementation of the pavement designs were analyzed. Benefits are presented through descriptions of the rehabilitation project, background on the development of long-life pavement rehabilitation innovations, and design requirements that limit permanent deformation (rutting) within the first 5 years of service. Results from field measurements confirmed that the innovative pavements met the performance criterion. The final results of a pilot study to quantify direct benefits stemming from accelerated pavement testing are presented. Cost-benefit analysis that included agency costs with and without road user costs was used, and the influence of the discount rate in net present value calculations is given. Road user costs had a significant influence on cost-benefit calculations, especially in the case of a heavily congested freeway. This influence led to cost savings ranging from $1.128 million to $121.570 million, which emphasized the importance of performing a sensitivity analysis instead of reporting a single estimate of savings and benefit-cost ratio. The final results showed clear field performance benefits of the pavement innovations and indicated positive economic benefits from the research that led to innovations
http://www.trb.org/Finance/TRRJournalOnline1.aspx
http://trrjournalonline.trb.org/doi/abs/10.3141/2367-07
DOI: http://dx.doi.org/10.3141/2367-07
en
The National Academies of Sciences, Engineering, and Medicine
Case study for evaluating benefits of pavement research: final results
Article
10394/16718
oai:v-des-dev-lnx1:10394/16718
2016-04-28 11:34:45.121
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/276832018-06-19T12:17:19Zcom_10394_1865col_10394_1869
Mthombo, Thabo
79971d7f-6f5f-4d92-bde3-0b17627b26e9
600
Strydom, C.
28ab95b6-85d9-4d19-9b18-78bca735b535
600
Bunt, J.
187981f9-869d-44d5-ad01-ba7ad026bd86
600
25805703 - Mthombo, Thabo Sydney
20164200 - Bunt, John Reginald
20682972 - Strydom, Christiena Adriana
2018-06-19T12:15:23Z
2018-06-19T12:15:23Z
2016
Mthombo, T. et al. 2016. Mechanical and thermal characterization of briquetted high ash South African coal fines using low density polyethylene as the binding agent. 33rd Annual International Pittsburgh Coal Conference (IPCC 2016). Coal: energy, environment and sustainable development, Cape Town, South Africa, 8-12 Aug. 2016: 771-779. [http://toc.proceedings.com/37637webtoc.pdf]
978-1-5108-5366-9
http://hdl.handle.net/10394/27683
http://toc.proceedings.com/37637webtoc.pdf
en
International Pittsburgh Coal Conference
Mechanical and thermal characterization of briquetted high ash South African coal fines using low density polyethylene as the binding agent
Presentation
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/27683/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/27683
oai:v-des-dev-lnx1:10394/27683
2018-06-19 14:17:19.379
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
Tk9OLUVYQ0xVU0lWRSBESVNUUklCVVRJT04gTElDRU5TRQoKQnkgc2lnbmluZyBhbmQgc3VibWl0dGluZyB0aGlzIGxpY2Vuc2UsIHlvdSAodGhlIGF1dGhvcihzKSBvciBjb3B5cmlnaHQgb3duZXIpCmdyYW50cyB0byBOb3J0aC1XZXN0IFVuaXZlcnNpdHkgKE5XVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24KaW5jbHVkaW5nIHRoZSBhYnN0cmFjdCkgd29ybGR3aWRlIGluIHByaW50IGFuZCBlbGVjdHJvbmljIGZvcm1hdCBhbmQgaW4gYW55IG1lZGl1bSwKaW5jbHVkaW5nIGJ1dCBub3QgbGltaXRlZCB0byBhdWRpbyBvciB2aWRlby4KCllvdSBhZ3JlZSB0aGF0IE5XVSBtYXksIHdpdGhvdXQgY2hhbmdpbmcgdGhlIGNvbnRlbnQsCnRyYW5zbGF0ZSB0aGUgc3VibWlzc2lvbiB0byBhbnkgbWVkaXVtIG9yIGZvcm1hdCBmb3IgdGhlIHB1cnBvc2Ugb2YgcHJlc2VydmF0aW9uLgpZb3UgYWxzbyBhZ3JlZSB0aGF0IE5XVSBtYXkga2VlcCBtb3JlIHRoYW4gb25lIGNvcHkgb2YgdGhpcyBzdWJtaXNzaW9uIGZvciBwdXJwb3NlcyBvZiBzZWN1cml0eSwKYmFjay11cCBhbmQgcHJlc2VydmF0aW9uLgoKWW91IHJlcHJlc2VudCB0aGF0IHRoZSBzdWJtaXNzaW9uIGlzIHlvdXIgb3JpZ2luYWwgd29yaywKYW5kIHRoYXQgeW91IGhhdmUgdGhlIHJpZ2h0IHRvIGdyYW50IHRoZSByaWdodHMgY29udGFpbmVkIGluIHRoaXMgbGljZW5zZS4KWW91IGFsc28gcmVwcmVzZW50IHRoYXQgeW91ciBzdWJtaXNzaW9uIGRvZXMgbm90LCB0byB0aGUgYmVzdCBvZiB5b3VyIGtub3dsZWRnZSwKaW5mcmluZ2UgdXBvbiBhbnlvbmUncyBjb3B5cmlnaHQuCgpJZiB0aGUgc3VibWlzc2lvbiBjb250YWlucyBtYXRlcmlhbCBmb3Igd2hpY2ggeW91IGRvIG5vdCBob2xkIGNvcHlyaWdodCwKeW91IHJlcHJlc2VudCB0aGF0IHlvdSBoYXZlIG9idGFpbmVkIHRoZSB1bnJlc3RyaWN0ZWQgcGVybWlzc2lvbiBvZiB0aGUgY29weXJpZ2h0IG93bmVyCnRvIGdyYW50IE5XVSB0aGUgcmlnaHRzIHJlcXVpcmVkIGJ5IHRoaXMgbGljZW5zZSwgYW5kIHRoYXQgc3VjaCB0aGlyZC1wYXJ0eSBvd25lZCBtYXRlcmlhbAppcyBjbGVhcmx5IGlkZW50aWZpZWQgYW5kIGFja25vd2xlZGdlZCB3aXRoaW4gdGhlIHRleHQgb3IgY29udGVudCBvZiB0aGUgc3VibWlzc2lvbi4KCklGIFRIRSBTVUJNSVNTSU9OIElTIEJBU0VEIFVQT04gV09SSyBUSEFUIEhBUyBCRUVOIFNQT05TT1JFRCBPUiBTVVBQT1JURUQgQlkgQU4gQUdFTkNZCk9SIE9SR0FOSVpBVElPTiBPVEhFUiBUSEFOIE5XVSwgWU9VIFJFUFJFU0VOVCBUSEFUIFlPVSBIQVZFIEZVTEZJTExFRCBBTlkgUklHSFQgT0YgUkVWSUVXCk9SIE9USEVSIE9CTElHQVRJT05TIFJFUVVJUkVEIEJZIFNVQ0ggQ09OVFJBQ1QgT1IgQUdSRUVNRU5ULgpOV1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZSBzdWJtaXNzaW9uLAphbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMgbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo=
oai:repository.nwu.ac.za:10394/276842020-06-24T11:32:42Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Sumbane-Prinsloo, L.P.
Bunt, J.
Neomagus, H.
Piketh, S.
Kühn, M.
18002080 - Piketh, Stuart John
20164200 - Bunt, John Reginald
12767107 - Neomagus, Hendrik Willem Johannes P.
22063560 - Sumbane-Prinsloo, L.P.
2018-06-19T12:22:15Z
2018-06-19T12:22:15Z
2016
Sumbane-Prinsloo, L.P. et al. 2016. Evaluation of a domestic-use low-smoke fuel produced via the pyrolysis of lump coals. 33rd Annual International Pittsburgh Coal Conference (IPCC 2016). Coal: energy, environment and sustainable development, Cape Town, South Africa, 8-12 Aug. 2016: 780-792. [http://toc.proceedings.com/37637webtoc.pdf]
978-1-5108-5366-9
http://hdl.handle.net/10394/27684
http://toc.proceedings.com/37637webtoc.pdf
en
International Pittsburgh Coal Conference
Evaluation of a domestic-use low-smoke fuel produced via the pyrolysis of lump coals
Presentation
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/27684/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/27684
oai:v-des-dev-lnx1:10394/27684
2020-06-24 13:32:42.634
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/181112019-06-25T14:10:49Zcom_10394_1865col_10394_1869
Gouws, Rupert
788d8ba8-cb33-4c5c-8992-49fe0dc3f84c
600
11760052 - Gouws, Rupert
2016-08-01T07:58:47Z
2016-08-01T07:58:47Z
2013
Gouws, R. 2013. Energy management by means of SMD model analysis for AMB systems with eccentricity. International journal of new trends in electronics and communication (IJNTEC), 1(3):14-19. [http://www.iret.co.in/J2.html]
2347-7334
http://hdl.handle.net/10394/18111
http://www.iret.co.in/Docs/IJNTEC/Volume%203/Issue1/3.%20Energy%20Management%20by%20means%20of%20SMD%20Model%20Analysis%20for%20AMB%20Systems%20with%20Eccentricity.pdf
This paper provides the spring-mass-damper (SMD)
model analysis of a radial active magnetic bearing (AMB)
system that displays eccentricity. Energy management of AMB
systems can be done by means of a detailed SMD model analysis.
It is specifically important to use SMD model analysis when the
AMB system displays eccentricity. A SMD model analysis as
well as the free-body diagram analysis is presented for the
following scenarios: 1) rotational load unbalance, 2) foundation
looseness, 3) rotating overhung rotor, 4) static eccentricity and
5) dynamic eccentricity
en
IRET (Institute of Research in Engineering and Technology)
Active magnetic bearings
energy management
eccentricity
spring-mass-damper
Energy management by means of SMD model analysis for AMB systems with eccentricity
Article
ORIGINAL
Int jnl new trends electronics communications-2013-1(3)-14.pdf
Int jnl new trends electronics communications-2013-1(3)-14.pdf
application/pdf
477350
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18111/1/Int%20jnl%20new%20trends%20electronics%20communications-2013-1%283%29-14.pdf
4f4e47e91d71ff5b1ba19e1d34efdbfc
MD5
1
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18111/2/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
2
TEXT
Int jnl new trends electronics communications-2013-1(3)-14.pdf.txt
Int jnl new trends electronics communications-2013-1(3)-14.pdf.txt
Extracted text
text/plain
18518
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18111/5/Int%20jnl%20new%20trends%20electronics%20communications-2013-1%283%29-14.pdf.txt
b53b58f599174fcf225cf37f2d3c4139
MD5
5
THUMBNAIL
Int jnl new trends electronics communications-2013-1(3)-14.pdf.jpg
Int jnl new trends electronics communications-2013-1(3)-14.pdf.jpg
IM Thumbnail
image/jpeg
3350
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18111/6/Int%20jnl%20new%20trends%20electronics%20communications-2013-1%283%29-14.pdf.jpg
12bf4fca5a8d3f091af2af48fbec99a7
MD5
6
10394/18111
oai:v-des-dev-lnx1:10394/18111
2019-06-25 16:10:49.005
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
Tk9OLUVYQ0xVU0lWRSBESVNUUklCVVRJT04gTElDRU5TRQoKQnkgc2lnbmluZyBhbmQgc3VibWl0dGluZyB0aGlzIGxpY2Vuc2UsIHlvdSAodGhlIGF1dGhvcihzKSBvciBjb3B5cmlnaHQgb3duZXIpCmdyYW50cyB0byBOb3J0aC1XZXN0IFVuaXZlcnNpdHkgKE5XVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24KaW5jbHVkaW5nIHRoZSBhYnN0cmFjdCkgd29ybGR3aWRlIGluIHByaW50IGFuZCBlbGVjdHJvbmljIGZvcm1hdCBhbmQgaW4gYW55IG1lZGl1bSwKaW5jbHVkaW5nIGJ1dCBub3QgbGltaXRlZCB0byBhdWRpbyBvciB2aWRlby4KCllvdSBhZ3JlZSB0aGF0IE5XVSBtYXksIHdpdGhvdXQgY2hhbmdpbmcgdGhlIGNvbnRlbnQsCnRyYW5zbGF0ZSB0aGUgc3VibWlzc2lvbiB0byBhbnkgbWVkaXVtIG9yIGZvcm1hdCBmb3IgdGhlIHB1cnBvc2Ugb2YgcHJlc2VydmF0aW9uLgpZb3UgYWxzbyBhZ3JlZSB0aGF0IE5XVSBtYXkga2VlcCBtb3JlIHRoYW4gb25lIGNvcHkgb2YgdGhpcyBzdWJtaXNzaW9uIGZvciBwdXJwb3NlcyBvZiBzZWN1cml0eSwKYmFjay11cCBhbmQgcHJlc2VydmF0aW9uLgoKWW91IHJlcHJlc2VudCB0aGF0IHRoZSBzdWJtaXNzaW9uIGlzIHlvdXIgb3JpZ2luYWwgd29yaywKYW5kIHRoYXQgeW91IGhhdmUgdGhlIHJpZ2h0IHRvIGdyYW50IHRoZSByaWdodHMgY29udGFpbmVkIGluIHRoaXMgbGljZW5zZS4KWW91IGFsc28gcmVwcmVzZW50IHRoYXQgeW91ciBzdWJtaXNzaW9uIGRvZXMgbm90LCB0byB0aGUgYmVzdCBvZiB5b3VyIGtub3dsZWRnZSwKaW5mcmluZ2UgdXBvbiBhbnlvbmUncyBjb3B5cmlnaHQuCgpJZiB0aGUgc3VibWlzc2lvbiBjb250YWlucyBtYXRlcmlhbCBmb3Igd2hpY2ggeW91IGRvIG5vdCBob2xkIGNvcHlyaWdodCwKeW91IHJlcHJlc2VudCB0aGF0IHlvdSBoYXZlIG9idGFpbmVkIHRoZSB1bnJlc3RyaWN0ZWQgcGVybWlzc2lvbiBvZiB0aGUgY29weXJpZ2h0IG93bmVyCnRvIGdyYW50IE5XVSB0aGUgcmlnaHRzIHJlcXVpcmVkIGJ5IHRoaXMgbGljZW5zZSwgYW5kIHRoYXQgc3VjaCB0aGlyZC1wYXJ0eSBvd25lZCBtYXRlcmlhbAppcyBjbGVhcmx5IGlkZW50aWZpZWQgYW5kIGFja25vd2xlZGdlZCB3aXRoaW4gdGhlIHRleHQgb3IgY29udGVudCBvZiB0aGUgc3VibWlzc2lvbi4KCklGIFRIRSBTVUJNSVNTSU9OIElTIEJBU0VEIFVQT04gV09SSyBUSEFUIEhBUyBCRUVOIFNQT05TT1JFRCBPUiBTVVBQT1JURUQgQlkgQU4gQUdFTkNZCk9SIE9SR0FOSVpBVElPTiBPVEhFUiBUSEFOIE5XVSwgWU9VIFJFUFJFU0VOVCBUSEFUIFlPVSBIQVZFIEZVTEZJTExFRCBBTlkgUklHSFQgT0YgUkVWSUVXCk9SIE9USEVSIE9CTElHQVRJT05TIFJFUVVJUkVEIEJZIFNVQ0ggQ09OVFJBQ1QgT1IgQUdSRUVNRU5ULgpOV1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZSBzdWJtaXNzaW9uLAphbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMgbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo=
oai:repository.nwu.ac.za:10394/182172016-08-12T06:48:09Zcom_10394_1865col_10394_1869
Avdeenkov, A.V.
1bbf52d8-9e37-40e8-892a-a07e80ab66d8
600
Bessarabov, D.G.
45cb56a1-743e-42e6-adbb-e77768988601
600
Tokarev, A.
fb88b8bd-db7c-41b3-9982-67d7a9f15298
600
Bodrenko, I.V.
162ec86a-b039-420e-8584-f8a2ef6a737b
600
Bibikov, A.V.
df64e1cb-add8-4344-8c9d-f08bc2b3d65e
600
22730389 - Bessarabov, Dmitri Georgievich
24851396 - Tokarev, Andrey
2016-08-11T11:43:48Z
2016-08-11T11:43:48Z
2015
Avdeenkov, A.V. et al. 2015. Thermodynamical model for hydrogen storage capacity in carbon nanostructures. International journal of hydrogen energy, 40(11):4184-4193. [http://www.journals.elsevier.com/international-journal-of-hydrogen-energy/]
0360-3199
1879-3487 (Online)
http://hdl.handle.net/10394/18217
http://dx.doi.org/10.1016/j.ijhydene.2015.01.129
http://www.sciencedirect.com/science/article/pii/S0360319915001974
A simple thermodynamical model taking into account non-ideality and inhomogeneity of
absorbed hydrogen molecular gas has been proposed to calculate hydrogen storage capacity
in carbon nanostructures as a function of temperature and pressure. The model
utilizing the effective interaction potential of the hydrogen molecule with the atoms of the
considered material, is based on the experimental equation of state and a local density
approximation for molecular hydrogen. We have applied the model for the search of the
optimal geometry for hydrogen storage of such promising carbon materials as a set of
graphene layers and bundles of carbon nanotubes. We demonstrate that the hydrogen
storage capacity depends on the geometry of material and discuss the origin of this effect
en
Elsevier
Hydrogen storage
optimal geometry
Thermodynamical model for hydrogen storage capacity in carbon nanostructures
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18217
oai:v-des-dev-lnx1:10394/18217
2016-08-12 08:48:09.988
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/99662016-04-28T09:35:22Zcom_10394_1865col_10394_1869
Gouws, Rupert
788d8ba8-cb33-4c5c-8992-49fe0dc3f84c
-1
2014-01-20T10:52:19Z
2014-01-20T10:52:19Z
2012
Gouws, R. 2012. Environmental impact of an industrial compressed air system for solar power in South Africa. Energy & environment, 23(8):1327-1337. [ URL ]
0958-305X
http://hdl.handle.net/10394/9966
Almost 14% of the electricity generated by the national energy supplier (Eskom) in South Africa is sold directly to the mining sector and almost 20% is utilized directly by the compressed air systems of the mining sector. The industrial compressed air systems in South Africa therefore have a substantial impact on the environment in terms of emissions output. In this paper a solar powered compressor is installed parallel to an existing industrial compressed air system. The environmental (emissions) impact and energy consumption of the industrial compressed air system with the solar powered compressor is calculated and the results are provided. It is shown from the results that the solar powered air compressor improved the overall system efficiency and lowered the carbon footprint of the industrial compressed air system. The impact of the energy improvement on the amount of trees required to offset the calculated amount of CO2 is also provided.
http://dx.doi.org/10.1260/0958-305X.23.8.1327
en
Multi-Science Publishing
Industrial compressed air
solar power
energy efficiency
emissions impact
Environmental impact of an industrial compressed air system for solar power in South Africa
Article
10394/9966
oai:v-des-dev-lnx1:10394/9966
2016-04-28 11:35:22.491
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/417822023-06-18T01:07:45Zcom_10394_1865col_10394_1869
Oosthuizen, Marko C
Hoffman, Alwyn J
Davel, Marelie H
2023-06-17T19:00:57Z
2023-06-17T19:00:57Z
2022
Oosthuizen, Marko C et.al.2022.A Comparative Study of Graph Neural Network Speed Prediction during Periods of Congestion.
http://hdl.handle.net/10394/41782
Traffic speed prediction using deep learning has been the topic of many studies. In this paper, we analyse
the performance of Graph Neural Network-based techniques during periods of traffic congestion. We first
compare a selection of recently proposed techniques that claim to achieve good results using the METR-LA
and PeMS-BAY data sets. We then investigate the performance of three of these approaches – GraphWaveNet,
Spacetime Neural Network (STNN) and Spatio-Temporal Attention Wavenet (STAWnet) – during congested
periods, using recurrent congestion patterns to set a threshold for general congestion through the entire traffic
network. Our results show that performance deteriorates significantly during congested time periods, which
is concerning, as traffic speed prediction is usually of most value during times of congestion. We also found
that, while the above approaches perform almost equally in the absence of congestion, there are much bigger
differences in performance during periods of congestion.
en
SciTePress
Traffic Prediction
Congestion
Graph Neural Network
A Comparative Study of Graph Neural Network Speed Prediction during Periods of Congestion
Article
ORIGINAL
Oosthuizen. M.C. A Comparative Study of Graph Neural Network.pdf
Oosthuizen. M.C. A Comparative Study of Graph Neural Network.pdf
application/pdf
501205
https://repository.nwu.ac.za/bitstream/10394/41782/1/Oosthuizen.%20M.C.%20A%20Comparative%20Study%20of%20Graph%20Neural%20Network.pdf
c96d66716ad7be217a7bbc070a67bbac
MD5
1
LICENSE
license.txt
license.txt
text/plain
1652
https://repository.nwu.ac.za/bitstream/10394/41782/2/license.txt
5bcc9b8c053facba986e0627f3259c0d
MD5
2
TEXT
Oosthuizen. M.C. A Comparative Study of Graph Neural Network.pdf.txt
Oosthuizen. M.C. A Comparative Study of Graph Neural Network.pdf.txt
Extracted text
text/plain
33976
https://repository.nwu.ac.za/bitstream/10394/41782/3/Oosthuizen.%20M.C.%20A%20Comparative%20Study%20of%20Graph%20Neural%20Network.pdf.txt
5ec4d36ee522f6989a05d642cae54db1
MD5
3
THUMBNAIL
Oosthuizen. M.C. A Comparative Study of Graph Neural Network.pdf.jpg
Oosthuizen. M.C. A Comparative Study of Graph Neural Network.pdf.jpg
Generated Thumbnail
image/jpeg
2150
https://repository.nwu.ac.za/bitstream/10394/41782/4/Oosthuizen.%20M.C.%20A%20Comparative%20Study%20of%20Graph%20Neural%20Network.pdf.jpg
b28440aa91c69b6375275a3b9f5e50fd
MD5
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10394/41782
oai:repository.nwu.ac.za:10394/41782
2023-06-18 03:07:45.747
Institutional Repository | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/138702016-04-28T09:34:42Zcom_10394_1865col_10394_1869
Malumbazo, N.
ef968ccd-dedc-471b-b63a-d962fc333910
-1
Wagner, N.J.
15677aee-a17d-4383-a212-76f01a5bcdb8
-1
Bunt, J.R.
4161f585-5e87-4bfb-8d1a-b4c61c80f12b
-1
20164200 - Bunt, John Reginald
2015-05-26T09:15:40Z
2015-05-26T09:15:40Z
2013
Malumbazo, N. et al. 2013. The impact of particle size and maceral segregation on char formation in a packed bed combustion unit. Fuel. 111:350-356. [http://www.journals.elsevier.com/fuel/]
0016-2361
1873-7153 (Online)
http://hdl.handle.net/10394/13870
Highveld parent coal was crushed into three size fractions, namely: 5 mm–75 mm, 5 mm–53 mm, and
5–37.5 mm. The crushed samples were subjected as feed coals to heating in a packed-bed reactor to
investigate the influence of particle size reduction on char formation and reactivity. Coal petrography
was utilized to assess the maceral and char formation distribution of the feed coal samples and their
packed-bed combustion unit’s products. The maceral distribution of the feed coal fractions differed from
the typical run-of-mine Highveld coal petrographic composition; the smallest size fractions ( 53 mm
and 37.5 mm) having the highest vitrinite content. Maceral distribution was further divided into total
reactive maceral particles, total inert maceral particles, and total inertinite particles. The 53 mm and
37.5 mm feed coal samples had the highest total reactive maceral particle content. Inert char particles
dominated in the packed-bed combustion unit samples due to high inertinite maceral group content of
the Highveld coals. Unexpectedly, the 53 mm feed coal sample had higher content of total reactive
maceral particles and lower content of total inert maceral particles; whereas the 37.5 mm feed coal
sample had high content of reactive maceral particles and high content of total inert maceral particles.
This variation in maceral group content lead to the 53 mm feed coal sample being more reactive (producing
more devolatilized and porous chars and thus reacting faster with reactant gases) than the
37.5 mm feed coal sample. This was due to inert maceral particles restricting the 37.5 mm feed coal
sample from fully softening and reacting with reactant gas. This was also this was attributed to variation
in volatile propagation of the three particle sizes. This confirms that a feed coal with smaller particle sizes
results in different reactivity, char formation, and better heat transfer during combustion than the feed
coal with large particle size range. Another important factor that plays a role in combustion is maceral
association; it was observed that maceral distribution has a great influence on the char formation and
its reactivity more than coal particle size.
http://www.journals.elsevier.com/fuel/
en
ELSEVIER
Highveld coal
char morphology
maceral segregation
reactivity
The impact of particle size and maceral segregation on char formation in a packed bed combustion unit
Article
10394/13870
oai:v-des-dev-lnx1:10394/13870
2016-04-28 11:34:42.357
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/135972020-09-02T10:20:16Zcom_10394_1865col_10394_1869
Du Plessis, Gideon Edgar
Liebenberg, Leon
Mathews, Edward Henry
12850071 - Liebenberg, Leon
10477438 - Mathews, Edward Henry
24046744 - Du Plessis, Gideon Edgar
2015-03-19T13:12:49Z
2015-03-19T13:12:49Z
2013
Du Plessis, G.E. et al. 2013. The use of variable speed drives for cost–effective energy savings in South African mine cooling systems. Applied energy, 111:16-27. [https://doi.org/10.1016/j.apenergy.2013.04.061]
0306-2619
http://hdl.handle.net/10394/13597
https://www.sciencedirect.com/science/article/abs/pii/S0306261913003577
https://doi.org/10.1016/j.apenergy.2013.04.061
An industrial energy efficiency improvement through the introduction of modern technology is an important demand-side management initiative. Cooling systems on South African mines have been identified as large electricity consumers. There is significant potential for energy efficiency improvement by the widespread introduction of variable speed drive (VSD) technology. An energy audit was conducted on 20 large mine cooling systems and potential savings and feasibility indicators were calculated. A pilot implementation study was also done on one mine to experimentally validate the estimated savings. In this paper, the results of the audit, the potential savings and the pilot study results are presented. It is shown that large-scale implementation of VSDs on mine cooling system pumps and fans is economically viable. A total annual electrical energy saving of 144,721 MW h, or 32.2%, can be achieved. An annual cost saving of US$6,938,148 and CO2 emissions reduction of 132 Mton is possible. The implementation of VSDs on mine chiller compressors will also result in large energy savings, but is not economically feasible at present. Results of the pilot study indicate an electricity savings of 29.9%. The results are important to decision makers and indicate the significant impact that widespread VSD usage on mine cooling systems can have on South African mine sustainability
en
Elsevier
Variable speed drives
mine cooling systems
energy savings
emission reductions
The use of variable speed drives for cost–effective energy savings in South African mine cooling systems
Article
10394/13597
oai:v-des-dev-lnx1:10394/13597
2020-09-02 12:20:16.52
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/33022020-08-18T11:23:12Zcom_10394_1865col_10394_1869
Bunt, J.R.
Waanders, F.B.
10059571 - Waanders, Frans Boudewijn
2010-08-04T15:35:16Z
2010-08-04T15:35:16Z
2009
Bunt, J.R. & Waanders, F.B. 2009. Trace element behaviour in the Sasol-Lurgi fixed-bed dry-bottom gasifier. Part 3. The non-volatile elements: Ba, Co, Cr, Mn, and V. Fuel, 89(3):537-548. [https://doi.org/10.1016/j.fuel.2009.04.018]
0360-1315
http://hdl.handle.net/10394/3302
https://www.sciencedirect.com/science/article/abs/pii/S0016236109001835
https://doi.org/10.1016/j.fuel.2009.04.018
Coal contains most of the naturally occurring chemical elements in (at least) trace amounts, with specific elements and their concentrations dependent on the rank of the coal and its geological origins. The focus of this paper is to discuss more recent environmentally-focused research developments by Sasol, where trace element simulation and validation of model predictions have been undertaken for the gasification process operating on low-rank bituminous Highveld coal. A Sasol-Lurgi fixed-bed dry-bottom (FBDB) gasifier was mined via turn-out sampling in order to determine the trace element changes through the gasifier, results being used for comparison with Fact-Sage modelled data for the non-volatile trace elements Ba, Co, Cr, Mn and V. Considering the experimental error, good agreement between measured results and model predictions in terms of ash phase partitioning behaviour was obtained for Ba, Co, Mn and V. On the contrary, rather poor agreement between model predicted and measured results were obtained for Cr partitioning to the solid ash fraction, which yielded a large overbalance (outside of experimental error) in the case of the measured results. This anomaly was found to not be caused by erosion of the gasifier internals, but rather possibly be ascribed to accumulation and contamination caused by likely condensation and vaporisation of this species during the gasifier sampling campaign, as well as by the particle size reduction processes utilized prior to elemental analyses. When considering the predicted speciation behaviour of the elements studied, the model output in some cases needs to be treated with some caution when validating findings with standard text book data for the elements studied, but was found to correctly model the elemental ash phase partitioning behaviour during fixed-bed gasification. Leaching tests have been conducted on the bottom ash collected from the gasifier and results have shown that the trace elements studied are firmly bound into the ash matrix and therefore would not be released during later disposal. The relative enrichment in trace element content observed for Cr within the gasifier should be further investigated
Elsevier
Sasol-Lurgi Fixed Bed Dry Bottom Gasification
Ba
Co
Cr
Mn
Trace element behaviour in the Sasol-Lurgi fixed-bed dry-bottom gasifier. Part 3. The non-volatile elements: Ba, Co, Cr, Mn, and V
Article
10394/3302
oai:v-des-dev-lnx1:10394/3302
2020-08-18 13:23:12.272
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/58922016-04-28T09:34:43Zcom_10394_1865col_10394_1869
Liebenberg, Leon
d2b3b2aa-857d-4cf5-a076-e94d9f75a040
-1
Mathews, Edward Henry
e70a934c-1075-432f-a8bd-9d22b6122452
-1
2012-02-29T09:49:12Z
2012-02-29T09:49:12Z
2010
Liebenberg, L. & Mathews, E.H. 2010. Integrating innovation skills in an introductory engineering design-build course. International journal of technology and design education, (10798):21, Sept. [http://www.springer.com/education+%26+language/learning+%26+instruction/journal/10798]
0957-7572
1573-1804 (Online)
http://hdl.handle.net/10394/5892
http://dx.doi.org/10.1007/s10798-010-9137-1
Spring
Integrating innovation skills in an introductory engineering design-build course
10394/5892
oai:v-des-dev-lnx1:10394/5892
2016-04-28 11:34:43.241
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/182222020-10-27T06:26:31Zcom_10394_1865col_10394_1869
Conradie, Frederik H.
Bunt, John R.
Neomagus, Hein W.J.P.
Waanders, Frans B.
Everson, Raymond C.
12895008 - Conradie, Frederik Hendrik
20164200 - Bunt, John Reginald
12767107 - Neomagus, Hendrik Willem Johannes P.
10059571 - Waanders, Frans Boudewijn
10168249 - Everson, Raymond Cecil
2016-08-11T14:16:44Z
2016-08-11T14:16:44Z
2015
Conradie, F.H. et al. 2015. A laboratory scale fixed-bed coal conversion reactor. Part 1. Operation, reaction zone identification and industrial representativeness. Journal of analytical and applied pyrolysis, 115:428-436. [https://doi.org/10.1016/j.jaap.2015.06.016]
0165-2370
1873-250X (Online)
http://hdl.handle.net/10394/18222
https://www.sciencedirect.com/science/article/pii/S016523701530067X
https://doi.org/10.1016/j.jaap.2015.06.016
Fixed bed coal gasification and combustion operations form an important part in the global energy supply, and these processes are characterized by complex interactions which are difficult to study on an industrial scale. A laboratory scale fixed-bed coal conversion reactor (LSR) was therefore constructed and used to mimic pilot and industrial scale fixed bed combustion and gasification. The initial design aims were to establish operating conditions comparable to that of previous pilot and commercial scale work. Secondary design aims were to keep operations less expensive, more flexible, while using smaller samples and particle sizes and maintaining representativeness. The laboratory scale reactor is 1200 mm in length and has an internal diameter of 104 mm. A 500 mm coal bed is initially loaded into the reactor and converted to produce an ash bed of 100 mm. The coal loading for this reactor was on average 3.6 kg in comparison to the 240 kg of the pilot scale reactor (PSR). A maximum temperature of 1250 °C was maintained to assure similarities to pilot and industrial operations. Seven thermocouples measured the axial temperature profile in the reactor. Measurement capabilities inside the reactor and post experiment bed dissection have shown that bed temperature profiles and reaction zones were representative of both a pilot scale reactor (PSR) and a commercial scale reactor (ISR)
South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation of South Africa (Chair Grant No. 86880, UID85643, Grant No. 85632)
en
Elsevier
Packed bed
coal
combustion
gasification
reaction zone
A laboratory scale fixed-bed coal conversion reactor. Part 1. Operation, reaction zone identification and industrial representativeness
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18222/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18222
oai:v-des-dev-lnx1:10394/18222
2020-10-27 08:26:31.499
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/210092017-03-30T13:59:29Zcom_10394_1865col_10394_1869
Tokarev, Andrey
a6b1503b-9126-49a3-897a-b70afb9f9fff
600
Bessarabov, Dmitri
dd89c594-d2ce-41c9-b2e8-ff373779e4ec
Kjeang, Erik
5af4a5b2-f08d-4853-8660-744116539c8a
Cannon, Mark
227cd790-67f5-4ee8-a8a3-0346dcd6ca88
600
22730389 - Bessarabov, Dmitri Georgievich
2017-03-30T12:42:23Z
2017-03-30T12:42:23Z
2016
Tokarev, A. et al. 2016. Theoretical limit of reversible hydrogen storage capacity for pristine and oxygen-doped boron nitride. International journal of hydrogen energy, 41(38):16984-16991. [https://www.journals.elsevier.com/international-journal-of-hydrogen-energy/]
0360-3199
http://hdl.handle.net/10394/21009
http://dx.doi.org/10.1016/j.ijhydene.2016.07.010
http://www.sciencedirect.com/science/article/pii/S0360319915317791
To achieve higher hydrogen storage capacity than that of compressed gas vessels, new advanced materials must be developed. Among the most promising are two-dimensional layered nanomaterials, such as graphene and boron nitride, storing hydrogen via physisorption which is potentially reversible at relatively low pressures. Unlike graphene, boron nitride is a polar material that makes it potentially more attractive for hydrogen physisorption. To quickly evaluate storage capacity of novel materials an efficient theoretical tool is proposed. A customized model combining quantum simulation with thermodynamic calculation is developed and applied for pristine and oxygen-doped boron nitride materials. It is shown that pristine boron nitride has a maximum reversible hydrogen storage capacity of 1.5 wt.% under 5 MPa at room temperature. Oxygen doping increases the capacity to 1.9 wt.% under the same conditions by deepening and widening the adsorption potential. Both gravimetric and volumetric storage properties are found to be strong functions of the interlayer separation distance of the material, with an optimum distance near 7 Å. The present results indicate that pristine and oxygen doped boron nitride materials have a suitable base configuration for potentially high reversible hydrogen storage
en
Elsevier
Hydrogen storage
Boron nitride
Density functional theory
Optimal geometry
Theoretical limit of reversible hydrogen storage capacity for pristine and oxygen-doped boron nitride
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/21009/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/21009
oai:v-des-dev-lnx1:10394/21009
2017-03-30 15:59:29.704
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
Tk9OLUVYQ0xVU0lWRSBESVNUUklCVVRJT04gTElDRU5TRQoKQnkgc2lnbmluZyBhbmQgc3VibWl0dGluZyB0aGlzIGxpY2Vuc2UsIHlvdSAodGhlIGF1dGhvcihzKSBvciBjb3B5cmlnaHQgb3duZXIpCmdyYW50cyB0byBOb3J0aC1XZXN0IFVuaXZlcnNpdHkgKE5XVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24KaW5jbHVkaW5nIHRoZSBhYnN0cmFjdCkgd29ybGR3aWRlIGluIHByaW50IGFuZCBlbGVjdHJvbmljIGZvcm1hdCBhbmQgaW4gYW55IG1lZGl1bSwKaW5jbHVkaW5nIGJ1dCBub3QgbGltaXRlZCB0byBhdWRpbyBvciB2aWRlby4KCllvdSBhZ3JlZSB0aGF0IE5XVSBtYXksIHdpdGhvdXQgY2hhbmdpbmcgdGhlIGNvbnRlbnQsCnRyYW5zbGF0ZSB0aGUgc3VibWlzc2lvbiB0byBhbnkgbWVkaXVtIG9yIGZvcm1hdCBmb3IgdGhlIHB1cnBvc2Ugb2YgcHJlc2VydmF0aW9uLgpZb3UgYWxzbyBhZ3JlZSB0aGF0IE5XVSBtYXkga2VlcCBtb3JlIHRoYW4gb25lIGNvcHkgb2YgdGhpcyBzdWJtaXNzaW9uIGZvciBwdXJwb3NlcyBvZiBzZWN1cml0eSwKYmFjay11cCBhbmQgcHJlc2VydmF0aW9uLgoKWW91IHJlcHJlc2VudCB0aGF0IHRoZSBzdWJtaXNzaW9uIGlzIHlvdXIgb3JpZ2luYWwgd29yaywKYW5kIHRoYXQgeW91IGhhdmUgdGhlIHJpZ2h0IHRvIGdyYW50IHRoZSByaWdodHMgY29udGFpbmVkIGluIHRoaXMgbGljZW5zZS4KWW91IGFsc28gcmVwcmVzZW50IHRoYXQgeW91ciBzdWJtaXNzaW9uIGRvZXMgbm90LCB0byB0aGUgYmVzdCBvZiB5b3VyIGtub3dsZWRnZSwKaW5mcmluZ2UgdXBvbiBhbnlvbmUncyBjb3B5cmlnaHQuCgpJZiB0aGUgc3VibWlzc2lvbiBjb250YWlucyBtYXRlcmlhbCBmb3Igd2hpY2ggeW91IGRvIG5vdCBob2xkIGNvcHlyaWdodCwKeW91IHJlcHJlc2VudCB0aGF0IHlvdSBoYXZlIG9idGFpbmVkIHRoZSB1bnJlc3RyaWN0ZWQgcGVybWlzc2lvbiBvZiB0aGUgY29weXJpZ2h0IG93bmVyCnRvIGdyYW50IE5XVSB0aGUgcmlnaHRzIHJlcXVpcmVkIGJ5IHRoaXMgbGljZW5zZSwgYW5kIHRoYXQgc3VjaCB0aGlyZC1wYXJ0eSBvd25lZCBtYXRlcmlhbAppcyBjbGVhcmx5IGlkZW50aWZpZWQgYW5kIGFja25vd2xlZGdlZCB3aXRoaW4gdGhlIHRleHQgb3IgY29udGVudCBvZiB0aGUgc3VibWlzc2lvbi4KCklGIFRIRSBTVUJNSVNTSU9OIElTIEJBU0VEIFVQT04gV09SSyBUSEFUIEhBUyBCRUVOIFNQT05TT1JFRCBPUiBTVVBQT1JURUQgQlkgQU4gQUdFTkNZCk9SIE9SR0FOSVpBVElPTiBPVEhFUiBUSEFOIE5XVSwgWU9VIFJFUFJFU0VOVCBUSEFUIFlPVSBIQVZFIEZVTEZJTExFRCBBTlkgUklHSFQgT0YgUkVWSUVXCk9SIE9USEVSIE9CTElHQVRJT05TIFJFUVVJUkVEIEJZIFNVQ0ggQ09OVFJBQ1QgT1IgQUdSRUVNRU5ULgpOV1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZSBzdWJtaXNzaW9uLAphbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMgbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo=
oai:repository.nwu.ac.za:10394/311072018-09-25T09:18:49Zcom_10394_1865col_10394_1869
Du Plessis, L.
2357ce80-e2d5-47df-817c-78afc2a59aed
600
Krüger, J.J.
51cc26ef-0063-4faa-8818-296233d30834
600
26601249 - Krüger, J.J.
2018-09-25T09:09:59Z
2018-09-25T09:09:59Z
2018
Du Plessis, L. & Krüger, J.J. 2018. Methods, measures and indicators for evaluating benefits of transportation research. International journal of pavement engineering, 19(2):181-190. [https://doi.org/10.1080/10298436.2016.1172713]
1029-8436
1477-268X (Online)
http://hdl.handle.net/10394/31107
https://doi.org/10.1080/10298436.2016.1172713
https://www.tandfonline.com/doi/full/10.1080/10298436.2016.1172713
The purpose of this article is to provide updated information by identifying and discussing methods, measures and indicators for evaluating benefits appropriate for transportation-related research facilities/programmes. The information has been drawn from within and outside transportation research. The article discusses the sources driving the need for evaluating benefits and describes the challenges confronting the evaluation process. It reviews and compares qualitative and quantitative techniques and highlights previous published work, investigations and case studies. Many traditional challenges of determining benefits persist, contributing to the gap between the ability to identify non-technical benefits of research and the growing need to demonstrate such benefits. This article aims to stimulate dialogue and investigations to advance the development of an appropriate robust method to determine quantitative benefits stemming from specifically accelerated pavement testing (APT) type transportation research. The ultimate goal is to help better understand, demonstrate and communicate the benefits of APT research
en
Taylor & Francis
Transportation research benefit determination
Benefit-cost analysis
Accelerated pavement testing
Methods, measures and indicators for evaluating benefits of transportation research
Article
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license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/31107
oai:v-des-dev-lnx1:10394/31107
2018-09-25 11:18:49.934
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/33002020-06-25T11:02:07Zcom_10394_1865col_10394_1869
Osifo, Peter O.
Neomagus, Hein W.J.P.
Everson, Raymond C.
Webster, Athena
Gun, Marius A.
12767107 - Neomagus, Hendrik Willem Johannes P.
10168249 - Everson, Raymond Cecil
2010-08-04T15:35:16Z
2010-08-04T15:35:16Z
2009
Osifo, P.O. et al. 2009. The adsorption of copper in a packed-bed of chitosan beads: modeling, multiple adsorption and regeneration. Journal of hazardous materials, 167(1-3):1242-1245. [https://doi.org/10.1016/j.jhazmat.2009.01.109]
0304-3894
http://hdl.handle.net/10394/3300
https://www.sciencedirect.com/science/article/abs/pii/S0304389409001526#!
https://doi.org/10.1016/j.jhazmat.2009.01.109
In this study, exoskeletons of Cape rock lobsters were used as raw material in the preparation of chitin that was successively deacetylated to chitosan flakes. The chitosan flakes were modified into chitosan beads and the beads were cross-linked with glutaraldehyde in order to study copper adsorption and regeneration in a packed-bed column. Five consecutive adsorption and desorption cycles were carried out and a chitosan mass loss of 25% was observed, after the last cycle. Despite the loss of chitosan material, an improved efficiency in the second and third cycles was observed with the adsorbent utilizing 97 and 74% of its adsorbent capacity in the second and third cycles, respectively. The fourth and fifth cycles, however, showed a decreased efficiency, and breakage of the beads was observed after the fifth cycle. In the desorption experiments, 91–99% of the adsorbed copper was regenerated in the first three cycles. It was also observed that the copper can be regenerated at a concentration of about a thousand fold the initial concentration. The first cycle of adsorption could be accurately described with a shrinking core particle model combined with a plug flow column model. The input parameters for this model were determined by batch characterization methods, with as only fitting parameter, the effective diffusion coefficient of copper in the bead
Elsevier
Copper adsorption
Cross-linked chitosan beads
Adsorption column
Column regeneration
The adsorption of copper in a packed-bed of chitosan beads: Modeling, multiple adsorption and regeneration
10394/3300
oai:v-des-dev-lnx1:10394/3300
2020-06-25 13:02:07.107
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/77632016-04-28T09:34:54Zcom_10394_1865col_10394_1869
Kleingeld, Marius
6a2cf583-9adf-4c77-979c-24c4848c08de
-1
Janse van Rensburg, Jacobus Johannes
29c6c083-5167-4fa9-b617-4566493ec484
-1
2012-11-15T06:24:09Z
2012-11-15T06:24:09Z
2011
Janse van Rensburg, J.J. & Kleingeld, M. 2011. An integral CFD approach for the thermal simulation of the PBMR reactor unit. Nuclear engineering and design, 241(8):3130-3141. [http://www.journals.elsevier.com/nuclear-engineering-and-design/]
0029-5493
1872-759X (Online)
http://hdl.handle.net/10394/7763
A CFD method was developed to conduct integral thermal reactor analysis for the complete Reactor Unit of the Pebble Bed Modular Reactor (Pty) Ltd (PBMR). The requirement was however also to include very detailed aspects such as leakage and bypass flow paths through the reflector blocks and sleeves. The aim was therefore to investigate the influence of leakage and bypass flow on the thermal performance of the Reactor Unit in an integral fashion. The focus of this paper is to discuss the methodology that was developed. The discussion will firstly highlight all the required inputs, elaborate briefly on the underlying theory and how this was implemented into the CFD modeling capability. Results will be discussed briefly, but the focus is on the methodology.
http://dx.doi.org/10.1016/j.nucengdes.2011.05.034
en
Elsevier
An integral CFD approach for the thermal simulation of the PBMR reactor unit
Article
10394/7763
oai:v-des-dev-lnx1:10394/7763
2016-04-28 11:34:54.93
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/173622018-03-07T12:33:40Zcom_10394_1865col_10394_1869col_10394_1872
Molapo, Raymond
4209a641-f75b-4987-9a67-c6b563e2a896
600
Barnard, Etienne
ecb42d4f-cc27-491a-af10-a530cfa46a00
600
de Wet, Febe
bb7cc09a-e675-476a-b8c1-068cc048ddc7
600
21021287 - Barnard, Etienne
2016-05-19T12:52:58Z
2016-05-19T12:52:58Z
2014
Molapo, R. et al. 2014. Speech data collection in an under-resourced language within a multilingual context. (In: 4th International Workshop on Spoken Language Technologies for Under-resourced Languages, St Petersburg, Russia, 14-16 May. p. 238-242).
978-5-8088-0908-6.
http://hdl.handle.net/10394/17362
In this paper, we present an end-to-end solution to the development of an automatic speech recognition (ASR) system in
typical under-resourced languages, where the target language is likely to be influenced by one more embedded foreign languages. We first describe the collection and processing of the text corpus crawled from the World Wide Web using the
Rapid Language Adaptation Toolkit. In particular, we highlight the challenges faced when foreign languages are embedded
within the matrix language. Thereafter, we discuss our speech data collection efforts in under-resourced environments.
We finally report on a strategy called transliteration that aids to improve recognition results of our grapheme-based automatic speech recognition system in the presence of embedded language words.
http://www.mica.edu.vn/sltu2014/
http://mica.edu.vn/sltu2014/proceedings/35.pdf
en
International Research Institute MICA
Under-resourced languages
Matrix language
Transliteration
Grapheme-based ASR
Speech data collection in an under-resourced language within a multilingual context
Presentation
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/17362/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
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Molapo_2014.pdf
Molapo_2014.pdf
molapo-2014-speech-data
application/pdf
3185950
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/17362/2/Molapo_2014.pdf
e577fa23099a8e0967663966d57d0d02
MD5
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10394/17362
oai:v-des-dev-lnx1:10394/17362
2018-03-07 14:33:40.029
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/181142019-06-25T14:10:51Zcom_10394_1865col_10394_1869
Gouws, R.
30aee899-cacd-45fb-827c-dcc27223c12d
600
Swanepoel, M.
618d4159-150b-46c5-a9e8-8107817e7f9b
600
11760052 - Gouws, Rupert
2016-08-01T09:41:13Z
2016-08-01T09:41:13Z
2012
Gouws, R. & Swanepoel, M. 2012. Source stabilisation of single-phase induction motor-pump configurations. Vector: 36-39, May. [http://www.vector.co.za/]
1818-2119
http://hdl.handle.net/10394/18114
http://www.ee.co.za/wp-content/uploads/legacy/Vector%202012/source%20stabilisation_norht-west%20university.pdf
The effect of source stabilisation on the energy consumption
and harmonic distortion of a single-phase induction motor-pump
configuration for a swimming pool in South Africa
en
EE Publishers
Source stabilisation of single-phase induction motor-pump configurations
Article
ORIGINAL
Vector-May2012-36.pdf
Vector-May2012-36.pdf
application/pdf
283141
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18114/1/Vector-May2012-36.pdf
687b38c70b05b9bb0919be26a419405f
MD5
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LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18114/2/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
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TEXT
Vector-May2012-36.pdf.txt
Vector-May2012-36.pdf.txt
Extracted text
text/plain
8175
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18114/5/Vector-May2012-36.pdf.txt
60e34d35aa3487d627357cee25fa8a1d
MD5
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THUMBNAIL
Vector-May2012-36.pdf.jpg
Vector-May2012-36.pdf.jpg
IM Thumbnail
image/jpeg
3399
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18114/6/Vector-May2012-36.pdf.jpg
e11b2d7f1b1d887c412cd09e09003619
MD5
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10394/18114
oai:v-des-dev-lnx1:10394/18114
2019-06-25 16:10:51.375
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/181362020-09-08T13:07:42Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Storm, M.E.
Gouws, R.
Grobler, L.J.
11760052 - Gouws, Rupert
11342021 - Grobler, Louis Johannes
11794097 - Storm, Markus Erasmus
2016-08-04T06:06:35Z
2016-08-04T06:06:35Z
2013
Storm, M.E. et al. 2013. Measurement and verification of the Eskom irrigation pumping standard product programme: evaluation of crop load factors. Proceedings of the Southern African Energy Efficiency Conference: 1-6, Nov. [https://www.researchgate.net/publication/305556682_Measurement_and_verification_of_the_Eskom_irrigation_pumping_standard_product_programme_Evaluation_of_crop_load_factors]
978-0-620-58204-9
http://hdl.handle.net/10394/18136
https://www.researchgate.net/publication/305556682_Measurement_and_verification_of_the_Eskom_irrigation_pumping_standard_product_programme_Evaluation_of_crop_load_factors
Eskom Integrated Demand Management (IDM) also
included irrigation in the Standard Product
Programme (SPP) to cater for smaller irrigation
Energy Efficient (EE) projects. The irrigation sector is a
large energy consumer in South Africa and may have a
large EE potential. The unique characteristics of
irrigation projects create significant challenges for
Measurement and Verification (M&V) under the SPP.
Previous M&V studies assessed a large sample of
irrigation pumping Variable Speed Drive (VSD) SPP
projects. These assessments were conducted to verify
project impact availability, project viability and
achieved savings credibility. A further study was
required to quantify attainable project impacts over the
whole project life by incorporating crop Load Factors
(LF). This paper focuses specifically on the evaluation
and validation of crop LFs as well as its applicability
and use in SPP irrigation projects. The evaluation was
conducted through a comprehensive crop LF analysis.
The aim of this analysis was to determine the typical LF
of a large sample of real world pumps and compare
these with the Eskom proposed crop LFs
en
Measurement and verification of the Eskom irrigation pumping standard product programme: evaluation of crop load factors
Presentation
ORIGINAL
Conf-Gouws-2013-Measurement_and_verification_of_the_Eskom.pdf
Conf-Gouws-2013-Measurement_and_verification_of_the_Eskom.pdf
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Conf-Gouws-2013-Measurement_and_verification_of_the_Eskom.pdf.txt
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10394/18136
oai:v-des-dev-lnx1:10394/18136
2020-09-08 15:07:42.794
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/182302020-08-19T09:43:21Zcom_10394_1865col_10394_1869
Everson, R.C.
Neomagus, H.W.J.P.
Van der Merwe, G.W.
Koekemoer, A.
Bunt, J.R.
10168249 - Everson, Raymond Cecil
12767107 - Neomagus, Hendrik Willem Johannes P.
20074476 - Van der Merwe, George William
13096788 - Koekemoer, Andrei Frederik
20164200 - Bunt, John Reginald
2016-08-12T08:57:53Z
2016-08-12T08:57:53Z
2015
Everson, R.C. et al. 2015. The properties of large coal particles and reaction kinetics of corresponding chars. Fuel, 140:17-26. [https://doi.org/10.1016/j.fuel.2014.09.038]
0016-2361
1873-7153 (Online)
http://hdl.handle.net/10394/18230
https://www.sciencedirect.com/science/article/pii/S0016236114009077
https://doi.org/10.1016/j.fuel.2014.09.038
An investigation was undertaken to determine the distribution of chemical-, petrographic- and mineralogical properties of large coal particles of different sizes and densities and to evaluate a suitable reaction rate model for combustion of corresponding chars. This was undertaken in order to contribute to the knowledge of the combustion kinetics of large particles in fluidized bed combustion and moving bed combustion/gasification. The study was confined to a mineral rich (24.1 wt%) and inertinite rich (74 wt%) parent coal (precursor) that was separated into different sizes and density fractions. The combustion reactive properties of chars prepared at 1100 °C and at a reaction temperature of 1000 °C were determined using a horizontal tubular furnace with the associated on-line analysers and temperature controllers. Coal particles in the size range of 0.50–53 mm diameter and density from 1.4 g cm−3 to 2.0 g cm−3 were studied. The characterisation of the different coal samples consisting of ash content, maceral content, fuel ratios and calorific values showed that the parameters did not vary significantly over the particle size ranges, but were different for the different density fractions. Combustion studies showed that particle size and density influenced the time required for complete conversion of the chars. The smaller particles and low density particles reacted faster and the modeling of the experimental data showed that the isothermal shrinking un-reacted core model with film and ash layer diffusion was applicable. The effective ash layer diffusion becomes more prominent as the density increased and the mass transfer coefficients correlated well with published results
National Research Foundation, South Africa
en
Elsevier
Large coal particles
particle size
particle density
devolatilization
combustion
The properties of large coal particles and reaction kinetics of corresponding chars
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
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10394/18230
oai:v-des-dev-lnx1:10394/18230
2020-08-19 11:43:21.882
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/58942016-04-28T09:34:43Zcom_10394_1865col_10394_1869
Uren, Kenneth Richard
5c07ea5e-f604-47b1-b057-ac7601d5bafa
-1
Van Niekerk, Casparus Rynhardt
673df720-5836-4fa5-8fb3-ae31175e76a6
-1
Van Schoor, George
3b6ad4b1-e1c0-466c-beec-351a3d766415
-1
2012-02-29T09:49:12Z
2012-02-29T09:49:12Z
2010
Uren, K.R., Van Niekerk, C.R. & Van Schoor, G. 2010. Optimal power control of a three-shaft brayton cycle based power conversion unit. SAIEE Africa research journal (transactions of the South African insitute of electrical engineers), 101(2):60-67, Jun. [http://www.saiee.org.za/index.php]
1991-1696
http://hdl.handle.net/10394/5894
Gardenview [South Africa] : SAIEE Publications
Optimal power control of a three-shaft brayton cycle based power conversion unit
10394/5894
oai:v-des-dev-lnx1:10394/5894
2016-04-28 11:34:43.269
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/182402020-08-19T09:25:51Zcom_10394_1865col_10394_1869
Koech, Lawrence
Everson, Ray
Neomagus, Hein
Rutto, Hilary
10168249 - Everson, Raymond Cecil
12767107 - Neomagus, Hendrik Willem Johannes P.
2016-08-15T11:04:30Z
2016-08-15T11:04:30Z
2015
Koech, L. et al. 2015. Leaching kinetics of bottom ash waste as a source of calcium ions. Journal of the Air & Waste Management Association, 65(2):126-132. [https://doi.org/10.1080/10962247.2014.978958]
1096-2247
2162-2906 (Online)
http://hdl.handle.net/10394/18240
https://www.tandfonline.com/doi/full/10.1080/10962247.2014.978958
https://doi.org/10.1080/10962247.2014.978958
Bottom ash is a waste material from coal-fired power plants, and it is known to contain elements that are potentially toxic at
high concentration levels when disposed in landfills. This study investigates the use of bottom ash as a partial substitute sorbent
for wet flue gas desulfurization (FGD) processes by focusing on its leaching kinetics in adipic acid. This was studied basing on
the shrinking core model that was applied to the experimental data obtained by the authors presented at the International
Conference on Industrial, Manufacturing, Automation and Mechanical Engineering, Johannesburg, South Africa, November
27–28, 2013) on dissolution of bottom ash. The leaching rate constant was obtained from different reaction variables, namely,
temperature, pH, acid concentration, and solid-to-liquid ratio, that could affect the leaching process. The solid sample of bottom
ash was characterized at different leaching periods using X-ray diffraction (XRD) and scanning electron microscopy (SEM). It
was found that solid-to-liquid ratio had a significant effect on the leaching rate constant when compared with other variables.
The leaching kinetics showed that diffusion through the product layer was the rate-controlling step during leaching, and the
activation energy for the process was found to be 18.92 kJ/mol
Eskom Power Plant
Engineering Institute (EPPEI)
en
Taylor & Francis
Leaching kinetics of bottom ash waste as a source of calcium ions
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18240
oai:v-des-dev-lnx1:10394/18240
2020-08-19 11:25:51.711
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/93592020-09-15T12:34:00Zcom_10394_1865col_10394_1869
Cilliers, Anthonie Christoffel
Mulder, Eben Johan
11858176 - Cilliers, Anthonie Christoffel
13276379 - Mulder, Eben Johan
2013-10-24T10:37:18Z
2013-10-24T10:37:18Z
2012
Cilliers, A.C. & Mulder, E.J. 2012. Adapting plant measurement data to improve hardware fault detection performance in pressurised water reactors. Annals of nuclear energy, 49:81-87. [http://www.journals.elsevier.com/annals-of-nuclear-energy/]
0306-4549
1873-2100 (Online)
http://hdl.handle.net/10394/9359
https://www.sciencedirect.com/science/article/pii/S0306454912001958
https://doi.org/10.1016/j.anucene.2012.05.027
With the fairly recent adoption of digital control and instrumentation systems in the nuclear industry a lot of research now focus on the development expert fault identification systems. The fault identification systems enable detecting early onset faults of fault causes which allows maintenance planning on the equipment showing signs of deterioration or failure. This includes valve and leaks and small cracks in steam generator tubes usually detected by means of ultrasonic inspection.
Detecting faults early during transient operation in NPPs is problematic due to the absence of a reliable reference to compare plant measurements with during transients. The distributed application of control systems operating independently to keep the plant operating within the safe operating boundaries complicates the problem since the control systems would not only operate to reduce the effect of transient disturbances but fault disturbances as well.
This paper provides a method to adapt the plant measurements that isolates the control actions on the fault and re-introduces it into the measurement data, thereby improving plant diagnostic performance.
http://dx.doi.org/10.1016/j.anucene.2012.05.027
en
Elsevier
Nuclear plant safety
diagnostics
fault detection
predictive maintenance
Adapting plant measurement data to improve hardware fault detection performance in pressurised water reactors
Article
10394/9359
oai:v-des-dev-lnx1:10394/9359
2020-09-15 14:34:00.961
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/182732020-08-19T13:49:47Zcom_10394_1865col_10394_1868col_10394_1869
Van Niekerk, Willem
Mentz, Elsa
10191984 - Van Niekerk, Wilhelm Marinus Kalmyn
10064915 - Mentz, Elsa
2016-08-17T07:21:57Z
2016-08-17T07:21:57Z
2015
Van Niekerk, W. & Mentz, E. 2015. Cooperative pair problem solving: a strategy for problem solving tutorials in the engineering sciences. International journal of engineering education, 31(6):1516-1525. [https://dialnet.unirioja.es/servlet/articulo?codigo=7353362]
0949-149X (Online)
http://hdl.handle.net/10394/18273
https://dialnet.unirioja.es/servlet/articulo?codigo=7353362
Engineering science courses, such as Thermodynamics, are often seen as difficult, and students have difficulty understanding the
concepts and solving the problems. In an effort to improve the situation, we developed a well-structured, cooperative teachinglearning
strategy, Cooperative Pair Problem Solving (CPPS), suitable for large groups (more than one hundred students) for
implementation during tutorial sessions. CPPS will be of interest to educators already making use of tutorial sessions where
students solve problems under the guidance of the lecturer and/or assistants. For educators expecting students to solve problems on
their own, as homework, CPPS presents a viable alternative strategy to harness the proven advantages of Cooperative Learning.
This article describes the procedure we followed with the implementation of CPPS during the tutorials. It further reports on the
extent to which we were able to structure the five elements of CL and the effect this had on the tutorials. The study was performed
at two universities in South Africa. The population comprised the second-year engineering students taking their first course in
Thermodynamics—in total, approximately 400 students in three groups. The students and assistants completed questionnaires and
two observers were asked to attend tutorials and report on their observations. There was almost universal agreement that CPPS led
to effective cooperation between the students. From the questionnaires, it was clear that positive interdependence was sufficiently
structured into the procedure. The majority of students engaged in promotive interaction and took responsibility to complete the
task. The students possessed sufficient social skills to work effectively together, and group processing was effected by letting the
groups grade their own work. It was found that an effective group formation procedure is vital for the successful implementation
of CPPS otherwise students tend to sit with friends, and positive interdependence and promotive interaction suffer. Although CPPS
was developed in a Thermodynamics environment, we are convinced that it can also be implemented successfully in other
engineering science and even pure science courses where instructors want to implement CL during problem solving tutorials
en
Tempus Publications
Thermodynamics
cooperative learning
large groups
pair problem solving
Cooperative pair problem solving: a strategy for problem solving tutorials in the engineering sciences
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18273/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18273
oai:v-des-dev-lnx1:10394/18273
2020-08-19 15:49:47.287
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/180622019-06-25T14:09:57Zcom_10394_1865col_10394_1869
Gouws, Rupert
788d8ba8-cb33-4c5c-8992-49fe0dc3f84c
600
Visser, Tjaart
a9bc41d4-f97f-4a18-8bf4-c0a6cfaadbc1
600
11760052 - Gouws, Rupert
2016-07-27T08:22:31Z
2016-07-27T08:22:31Z
2014
Gouws, R. & Visser T. 2014. Prototype monitoring system for power line inspection by means of a PandaBoard. Journal of energy and power engineering, 8(1):176-182. [http://www.davidpublisher.com/Home/Journal/JEPE]
1934-8975
1934-8983 (Online)
http://hdl.handle.net/10394/18062
http://dx.doi.org/10.17265/1934-8975/2014.01.020
http://www.davidpublisher.com/index.php/Home/Article/index?id=12333.html
The national energy supplier (Eskom in South Africa) supplies electricity through thousands-of-kilometers of overhead
power lines. The current methods of inspection of these overhead power lines are infrequent and expensive. In this paper, the authors
present the development of a prototype monitoring system for power line inspection in South Africa. The developed prototype
monitoring system collects data (information) from the overhead power lines, is remotely accessible and fits into a power line robot.
The prototype monitoring system makes use of a PandaBoard® (SBC) with GPS receiver and 5 MP camera to collect data. Hardware
fatigue is the biggest problem faced on the overhead power lines and is captured by means of the 5 MP camera and is displayed on a
website hosted by the PandaBoard® via Wi-Fi. The monitoring system has low power consumption, is light weight, compact and easily
collects data. The data obtained from the prototype monitoring system was satisfactory and provides an improved solution for
monitoring power lines for Eskom in South Africa
en
David Publishing
PandaBoard
inspection robot
monitoring system
transmission line inspection
Prototype monitoring system for power line inspection by means of a PandaBoard
Article
ORIGINAL
Jnl energy power engineering-2014-8(1)-176.pdf
Jnl energy power engineering-2014-8(1)-176.pdf
application/pdf
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LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18062/2/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
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Jnl energy power engineering-2014-8(1)-176.pdf.txt
Jnl energy power engineering-2014-8(1)-176.pdf.txt
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image/jpeg
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MD5
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10394/18062
oai:v-des-dev-lnx1:10394/18062
2019-06-25 16:09:57.981
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
Tk9OLUVYQ0xVU0lWRSBESVNUUklCVVRJT04gTElDRU5TRQoKQnkgc2lnbmluZyBhbmQgc3VibWl0dGluZyB0aGlzIGxpY2Vuc2UsIHlvdSAodGhlIGF1dGhvcihzKSBvciBjb3B5cmlnaHQgb3duZXIpCmdyYW50cyB0byBOb3J0aC1XZXN0IFVuaXZlcnNpdHkgKE5XVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24KaW5jbHVkaW5nIHRoZSBhYnN0cmFjdCkgd29ybGR3aWRlIGluIHByaW50IGFuZCBlbGVjdHJvbmljIGZvcm1hdCBhbmQgaW4gYW55IG1lZGl1bSwKaW5jbHVkaW5nIGJ1dCBub3QgbGltaXRlZCB0byBhdWRpbyBvciB2aWRlby4KCllvdSBhZ3JlZSB0aGF0IE5XVSBtYXksIHdpdGhvdXQgY2hhbmdpbmcgdGhlIGNvbnRlbnQsCnRyYW5zbGF0ZSB0aGUgc3VibWlzc2lvbiB0byBhbnkgbWVkaXVtIG9yIGZvcm1hdCBmb3IgdGhlIHB1cnBvc2Ugb2YgcHJlc2VydmF0aW9uLgpZb3UgYWxzbyBhZ3JlZSB0aGF0IE5XVSBtYXkga2VlcCBtb3JlIHRoYW4gb25lIGNvcHkgb2YgdGhpcyBzdWJtaXNzaW9uIGZvciBwdXJwb3NlcyBvZiBzZWN1cml0eSwKYmFjay11cCBhbmQgcHJlc2VydmF0aW9uLgoKWW91IHJlcHJlc2VudCB0aGF0IHRoZSBzdWJtaXNzaW9uIGlzIHlvdXIgb3JpZ2luYWwgd29yaywKYW5kIHRoYXQgeW91IGhhdmUgdGhlIHJpZ2h0IHRvIGdyYW50IHRoZSByaWdodHMgY29udGFpbmVkIGluIHRoaXMgbGljZW5zZS4KWW91IGFsc28gcmVwcmVzZW50IHRoYXQgeW91ciBzdWJtaXNzaW9uIGRvZXMgbm90LCB0byB0aGUgYmVzdCBvZiB5b3VyIGtub3dsZWRnZSwKaW5mcmluZ2UgdXBvbiBhbnlvbmUncyBjb3B5cmlnaHQuCgpJZiB0aGUgc3VibWlzc2lvbiBjb250YWlucyBtYXRlcmlhbCBmb3Igd2hpY2ggeW91IGRvIG5vdCBob2xkIGNvcHlyaWdodCwKeW91IHJlcHJlc2VudCB0aGF0IHlvdSBoYXZlIG9idGFpbmVkIHRoZSB1bnJlc3RyaWN0ZWQgcGVybWlzc2lvbiBvZiB0aGUgY29weXJpZ2h0IG93bmVyCnRvIGdyYW50IE5XVSB0aGUgcmlnaHRzIHJlcXVpcmVkIGJ5IHRoaXMgbGljZW5zZSwgYW5kIHRoYXQgc3VjaCB0aGlyZC1wYXJ0eSBvd25lZCBtYXRlcmlhbAppcyBjbGVhcmx5IGlkZW50aWZpZWQgYW5kIGFja25vd2xlZGdlZCB3aXRoaW4gdGhlIHRleHQgb3IgY29udGVudCBvZiB0aGUgc3VibWlzc2lvbi4KCklGIFRIRSBTVUJNSVNTSU9OIElTIEJBU0VEIFVQT04gV09SSyBUSEFUIEhBUyBCRUVOIFNQT05TT1JFRCBPUiBTVVBQT1JURUQgQlkgQU4gQUdFTkNZCk9SIE9SR0FOSVpBVElPTiBPVEhFUiBUSEFOIE5XVSwgWU9VIFJFUFJFU0VOVCBUSEFUIFlPVSBIQVZFIEZVTEZJTExFRCBBTlkgUklHSFQgT0YgUkVWSUVXCk9SIE9USEVSIE9CTElHQVRJT05TIFJFUVVJUkVEIEJZIFNVQ0ggQ09OVFJBQ1QgT1IgQUdSRUVNRU5ULgpOV1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZSBzdWJtaXNzaW9uLAphbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMgbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo=
oai:repository.nwu.ac.za:10394/214352017-04-19T06:21:09Zcom_10394_1865col_10394_1869col_10394_1872
Bessarabov, Dmitri
dd89c594-d2ce-41c9-b2e8-ff373779e4ec
600
Krüger, Andries
a4aeb0a7-1a61-45b2-b572-e13843ffbc85
600
Luopa, Sean M.
e3907aed-ee6d-4126-9abd-f3f416eda0d7
600
Park, Jiyoung
e41efe9e-f0dc-4a63-b0fb-33e0cc8c4262
600
Molnar, Attila A.
571b9d1a-f5a2-4139-bac0-550e44498b60
600
13061631 - Krüger, Andries Johannes
22730389 - Bessarabov, Dmitri Georgievich
2017-04-18T09:46:30Z
2017-04-18T09:46:30Z
2016
Bessarabov, D. et al. 2016. Gas crossover mitigation in PEM water electrolysis: hydrogen cross-over benchmark study of 3M's Ir-NSTF based electrolysis catalyst-coated membranes. ECS transactions, 75(14):1165-1173. [http://ecst.ecsdl.org/]
http://hdl.handle.net/10394/21435
http://dx.doi.org/10.1149/07514.1165ecst
http://ecst.ecsdl.org/content/75/14/1165.full.pdf+html?sid=83d7f034-5c3a-4709-b6c0-b17901cc9e92
In this work we present some preliminary data, such as permeability (gas crossover) of oxygen and hydrogen as a function of current density and other operational variables, aimed at establishing baselines for unmitigated hydrogen crossover of 3M’s electrolyzer MEAs based on 3M’s NSTF low-PGM loading catalyst and several types of perfluoro sulfonic acid based PEM membranes, both of which are widely commercially available (such as Nafion™ membranes), and membranes made by 3M. Experimental challenges associated with ex situ and in situ gas crossover measurements will be also discussed
en
ECS
Gas crossover mitigation in PEM water electrolysis: hydrogen cross-over benchmark study of 3M's Ir-NSTF based electrolysis catalyst-coated membranes
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/21435
oai:v-des-dev-lnx1:10394/21435
2017-04-19 08:21:09.1
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/33092016-04-28T09:34:05Zcom_10394_1865col_10394_1869
Van Schoor, George
3b6ad4b1-e1c0-466c-beec-351a3d766415
-1
Gouws, Rupert
788d8ba8-cb33-4c5c-8992-49fe0dc3f84c
-1
2010-08-04T15:35:17Z
2010-08-04T15:35:17Z
2009
VAN SCHOOR, G., & GOUWS, R. 2009. Multiple frequency fault detection, correction and identification of vibration forces on the rotor of a rotational active magnetic bearing system. SAIEE Africa Research Journal, 99(4):114-123, Dec. [http://www.saiee.org.za/index.php]
1991-1696
http://hdl.handle.net/10394/3309
School of Electrical, Electronic and Computer Engineering, North-West University
Multiple frequency fault detection, correction and identification of vibration forces on the rotor of a rotational active magnetic bearing system
10394/3309
oai:v-des-dev-lnx1:10394/3309
2016-04-28 11:34:05.612
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/181622020-09-08T13:28:42Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Bisschoff, W.A.
Gouws, R.
11760052 - Gouws, Rupert
13273523 - Bisschoff, Wilhelm Andreas
2016-08-05T12:41:31Z
2016-08-05T12:41:31Z
2014
Bisschoff, W.A. & Gouws, R. 2014. Ontwerp van 'n energiebestuurstelsel vir optimale energieverbruik en effektiwiteit van 'n distribusievlakmikrokragnetwerk. Proceedings of the Student Symposium in Science, 6-7 Nov. Unisa, South Africa. [https://www.researchgate.net/publication/305556426_Design_of_an_energy_management_system_utilizing_optimum_energy_consumption_and_efficiency_of_a_distribution_level_microgrid_Ontwerp_van_%27n_energiebestuurstelsel_vir_optimale_energieverbruik_en_effekti]
http://hdl.handle.net/10394/18162
https://www.researchgate.net/publication/305556426_Design_of_an_energy_management_system_utilizing_optimum_energy_consumption_and_efficiency_of_a_distribution_level_microgrid_Ontwerp_van_%27n_energiebestuurstelsel_vir_optimale_energieverbruik_en_effekti
South African state-owned utility company, Eskom, is under severe pressure to ensure the stability and reliability of the national electricity grid. With a shortfall in capacity of the national electricity grid, the possibility of distribution level generation in the form of micro-grids takes rise
Onlangse persvrystellings en media-aankondigings deur die Suid-Afrikaanse staatsbeheerde nutsmaatskappy, Eskom, dui daarop dat die nasionale kragnetwerk onder geweldige druk is. Daar word enorme druk deur residensiële- en industriële elektrisiteitverbruikers uitgeoefen om die betroubaarheid van 'n stabiele kragnetwerk te verseker. Die moontlikheid van 'n mikrokragnetwerk bestaan wel binne die huidige gesentraliseerde kragnetwerk, maar word tans nie baie goed ondersteun deur Eskom en streekmunisipaliteite nie. Mikrokragnetwerke verwys na kragopwekking deur onafhanklike kragprodusente op distribusie- en transmissievlak. Mikrokragnetwerke kan as 'n selfstandige, kragnetwerkgeïntegreerde of hibriede kragnetwerk opgestel word. Sodoende, met toepassing van hierdie topologieë, kan die mikrokragnetwerk aanvullend tot die gesentraliseerde kragnetwerk wees. In eerstewêreldlande soos België en Switserland word mikrokragnetwerke baie goed ondersteun deurdat die nutsmaatskappye oortollige gegenereerde elektrisiteit by die mikrokragnetwerk terugkoop. Dit is egter nie die geval in Suid-Arika nie en oortollige gegenereerde elektrisiteit gaan verlore. 'n Residensiële energiebestuurstelsel kan die genoemde probleem oorkom deur aktiewe monitering en bestuur van die mikrokragnetwerk se inkomende en uitgaande energie
other
Ontwerp van 'n energiebestuurstelsel vir optimale energieverbruik en effektiwiteit van 'n distribusievlakmikrokragnetwerk
Design of an energy management system utilizing optimum energy consumption and efficiency of a distribution level microgrid
Presentation
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18162/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18162
oai:v-des-dev-lnx1:10394/18162
2020-09-08 15:28:42.143
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/112452020-08-19T13:04:34Zcom_10394_1865col_10394_1869
Du Toit, C.G.
Rousseau, P.G.
10184600 - Du Toit, Charl Gabriel De Kock
10199365 - Rousseau, Pieter Gerhardus
2014-08-22T07:14:33Z
2014-08-22T07:14:33Z
2012
Du Toit, C.G. & Rousseau, P.G. 2012. Modeling the flow and heat transfer in a packed bed high temperature gas-cooled reactor in the context of a systems CFD approach. Journal of heat transfer, 134(3): #031015. [https://doi.org/10.1115/1.4005152]
0022-1481
1528-8943
http://hdl.handle.net/10394/11245
https://asmedigitalcollection.asme.org/heattransfer/article-abstract/134/3/031015/455485/
https://doi.org/10.1115/1.4005152
ABSTRACT
Engineers are faced with two major challenges when carrying out the thermal-fluid design of a complex system consisting of many interacting components. The first challenge is to predict the performance of all the individual thermal-fluid components. The second challenge is to predict the performance of the integrated plant consisting of all its subsystems. The complexity associated with the thermal-fluid design of complex systems requires the use of a variety of analysis techniques and simulation tools. These range from simple one-dimensional models that do not capture all the significant physical phenomena, to large-scale three-dimensional computational fluid dynamics (CFD) codes that, for practical reasons, cannot simulate the entire plant as a single integrated model. In the systems CFD approach, a network code serves as the framework to link the models of the various components together and to control the solution. The models of the components can be of varying degrees of complexity. These can range from simple lumped models to complex fully three-dimensional CFD models. This paper gives a brief overview of the systems CFD (SCFD) approach and an overview of the model of the pebble bed nuclear reactor that was developed in the context of the SCFD approach.
http://dx.doi.org/10.1115/1.4005152
en
ASME
Modeling the flow and heat transfer in a packed bed high temperature gas-cooled reactor in the context of a systems CFD approach
Article
10394/11245
oai:v-des-dev-lnx1:10394/11245
2020-08-19 15:04:34.509
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/182292016-08-12T08:53:28Zcom_10394_1865col_10394_1869
Du Toit, Marina
f0fb94fc-d401-40d9-9fef-2f54f394b15d
600
Chirayath, Sunil
cd6a17ef-ee71-40e7-a024-a9e8967de029
600
20517122 - Du Toit, Maria Hendrina
2016-08-12T08:28:39Z
2016-08-12T08:28:39Z
2015
Du Toit, M. & Chirayath, S. 2015. Proposal for improved nuclear fuel utilisation and economic performance by utilising thorium. Journal of energy in Southern Africa, 26(2): 11-18. [http://www.erc.uct.ac.za/journals/jesa]
1021-447X
http://hdl.handle.net/10394/18229
http://www.erc.uct.ac.za/sites/default/files/image_tool/images/119/jesa/26-2jesa-dutoit-chirayath.pdf
A systematic and strategic nuclear power reactor
deployment roadmap has been developed for
South Africa within the national strategic plan, utilizing
thorium-based fuel. The roadmap was developed
through analysis of economical, strategic and
historical aspects. The accumulated advantages of
thorium-based fuels are summarized, which could
form the initiative to implement thorium-based
nuclear fuels in South Africa.
A timeline (which forms the basis of the roadmap)
was constructed and consists of three different phases.
Phase 1 starts in 2015 and extends to 2030.
Phase 2 starts in 2031 and ends in 2044 whilst
Phase 3 is from 2045 to 2060. Each phase is discussed
with regard to construction, implementation
and research activities. This roadmap starts at current
pressurized water reactors (PWRs) and
advances to future reactor technologies, using an
evolutionary approach.
In addition to the results reported in this paper, the
economic advantages to introducing thorium as a
fertile component in PWR fuels as compared to
once-through conventional uranium-only cycles is
explored (Du Toit & Cilliers, 2014). The economic
evaluation compares uranium fuel to thorium-uranium
fuel in terms of the fuel cycle costs, reactor
downtime costs due to refuelling and income
derived from electricity sales
Eskom; National Research Foundation (NRF), South Africa
en
Univ Cape Town, Energy Research Centre
PWR
thorium-based fuels
roadmap
fuel cycle
nuclear power in South Africa
Proposal for improved nuclear fuel utilisation and economic performance by utilising thorium
Article
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license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18229/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18229
oai:v-des-dev-lnx1:10394/18229
2016-08-12 10:53:28.434
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/182272018-08-23T13:05:30Zcom_10394_1865col_10394_1869
De Beer, M.
bf82a971-59bb-416d-bf42-866ad01d95cb
600
Liebenberg, L.
c9e26126-b9ea-4e85-85bd-27385e53c216
600
Doucet, F.J.
e41b3f8d-598b-46d3-9d54-a85bb4927415
600
Maree, J.P.
97cce87a-94d0-40a5-9e56-d2287eeb76b6
600
13087398 - De Beer, Marinda
12850071 - Liebenberg, Leon
2016-08-12T07:46:32Z
2016-08-12T07:46:32Z
2015
De Beer, M. et al. 2015. Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste. Waste management, 46:619-627. [https://doi.org/10.1016/j.wasman.2015.08.023]
0956-053X
http://hdl.handle.net/10394/18227
https://doi.org/10.1016/j.wasman.2015.08.023
https://www.sciencedirect.com/science/article/pii/S0956053X1530091X
We recently showed that the production of elemental sulphur and calcium carbonate (CaCO3) from gypsum waste by thermally reducing the waste into calcium sulphide (CaS) followed by its direct aqueous carbonation yielded low-grade carbonate products (i.e. <90 mass% as CaCO3). In this study, we used the insight gained from our previous work and developed an indirect aqueous CaS carbonation process for the production of high-grade CaCO3 (i.e. >99 mass% as CaCO3) or precipitated calcium carbonate (PCC). The process used an acid gas (H2S) to improve the aqueous dissolution of CaS, which is otherwise poorly soluble. The carbonate product was primarily calcite (99.5%) with traces of quartz (0.5%). Calcite was the only CaCO3 polymorph obtained; no vaterite or aragonite was detected. The product was made up of micron-size particles, which were further characterised by XRD, TGA, SEM, BET and true density. Results showed that about 0.37 ton of high-grade PCC can be produced from 1.0 ton of gypsum waste, and generates about 0.19 ton of residue, a reduction of 80% from original waste gypsum mass to mass of residue that needs to be discarded off. The use of gypsum waste as primary material in replacement of mined limestone for the production of PPC could alleviate waste disposal problems, along with converting significant volumes of waste materials into marketable commodities
THRIP (Technology and
Human Resource for Industry Programme of the National
Research Foundation (NRF)), Tshwane University of Technology
(TUT), Northwest University (NWU), the Council for Scientific and
Industrial Research (CSIR) and the Council for Geoscience (CGS)
en
Elsevier
Gypsum waste
indirect carbonation
precipitated calcium carbonate
calcium sulphide
valorisation
Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18227
oai:v-des-dev-lnx1:10394/18227
2018-08-23 15:05:30.815
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/138692020-08-31T05:30:50Zcom_10394_1865col_10394_1869
Brink, Jacobus
Marx, Sanette
10216847 - Marx, Sanette
2015-05-26T09:03:37Z
2015-05-26T09:03:37Z
2013
Brink, J. & Marx, S. 2013. Harvesting of Hartbeespoort Dam micro–algal biomass through sand filtration and solar drying. Fuel, 106:67-71. [https://doi.org/10.1016/j.fuel.2012.10.034]
0016-2361
1873-7153 (Online)
http://hdl.handle.net/10394/13869
https://www.sciencedirect.com/science/article/abs/pii/S0016236112008319
https://doi.org/10.1016/j.fuel.2012.10.034
Renewable energy sources such as biomass are becoming more and more important as alternative to fossil
fuels. One of the most exciting new sources of biomass is microalgae. One of the major obstacles in the commercial
production of microalgae as feedstock for biomass-to-liquid fuels, is the development of energy
efficient and cost effective harvesting methods for the separation of micro-algal biomass from its growth
medium. In this study, a promising method of harvesting micro-algal biomass from the Hartbeespoort
Dam through a combination of sand filtration and solar drying was investigated, which could be used to
increase the energy efficiency and cost effectiveness of an integrated biomass-to-liquids process. Microalgal
biomass was collected from the Hartbeespoort Dam and the wet biomass was allowed to separate
from the aqueous phase for 24 h through its natural buoyancy. The bottom aqueous layer was drained
and the top green layer of wet biomass was poured onto metal palettes containing buildings sand and left
in the sun to dry for 24 h. An average dry weight of 7.6 g of dried micro-algal biomass from the
Hartbeespoort Dam was harvested after one day of sun-drying on a patch of 0.0484 m2 or 497.7 g of building
sand. An average, annualized, volumetric harvesting yield of 4.6 kg L 1 a 1 of dry weight micro-algal
biomass was achieved per liter of Hartbeespoort Dam pulp and an average, annualized, aerial harvesting
yield of 47.3 kg m 2 a 1 of dry weight micro-algal biomass was achieved per square meter of drying area.
Micro-algal biomass from the Hartbeespoort Dam was successfully harvested by sun-drying on building
sand. The building sand substrate improves the separation of water from the wet micro-algal biomass.
As water is absorbed into the sand, it increases the drying area and thus increases the drying rate of the
micro-algal biomass. Solar radiation provides the energy to evaporate the moisture. Thermo-chemical liquefaction
is one of the preferred methods to extract bio-oils from microalgae, but is very energy-intensive.
After extraction of bio-oils, micro-algal biomass rests could be sand-filtered, sun-dried and combusted to
provide heating for the liquefaction section. Sand filtration and solar drying has the potential to produce
9938 GJ ha 1 a 1 of renewable energy which could be used to offset the energy requirements of an integrated
biomass-to-liquids process. Harvesting costs could also be reduced from 20% to 30% of the total cost
of biomass-to-liquids production to 18–19% by utilizing sand filtration and solar drying.
en
Elsevier
Hartbeespoort Dam
micro-algal biomass
harvesting
sand filtration
solar drying
Harvesting of Hartbeespoort Dam micro-algal biomass through sand filtration and solar drying
Article
10394/13869
oai:v-des-dev-lnx1:10394/13869
2020-08-31 07:30:50.633
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/190832020-10-27T12:32:28Zcom_10394_1865col_10394_1869
Bessarabov, Dmitri
Human, Gerhard
Chiuta, Steven
Van Niekerk, Frik
De Beer, Deon
Malan, Hannes
Grobler, L.J.
22730389 - Bessarabov, Dmitri Georgievich
21876533 - Chiuta, Steven
20828179 - Human, Gerhardus
21755876 - De Beer, Deon Johan
11342021 - Grobler, Louis Johannes
10291563 - Van Niekerk, Frederik
2016-10-17T06:27:53Z
2016-10-17T06:27:53Z
2014
Bessarabov, D. et al. 2014. HySA infrastructure center of competence: a strategic collaboration platform for renewable hydrogen production and storage for fuel cell telecom applications. 36th International Telecommunications Energy Conference (INTELEC), 28 Sep - 2 Oct, Vancouver. [https:/doi.org/10.1109/INTLEC.2014.6972151]
978-1-4799-3104-0
http://hdl.handle.net/10394/19083
https://ieeexplore.ieee.org/document/6972151/
https:/doi.org/10.1109/INTLEC.2014.6972151
The Department of Science and Technology of South Africa developed the National Hydrogen and Fuel Cells Technologies (HFCT) Research, Development and Innovation Strategy. The National Strategy was branded Hydrogen South Africa (HySA). HySA has been established consisting of three Competency Centres - HySA Infrastructure, HySA Catalyst and HySA Systems. The scope of the Hydrogen Infrastructure Competency Centre (HySA Infrastructure CoC, [1]) is to develop applications and solutions for small- and medium-scale hydrogen production and storage through innovative research and development. The aim of this paper is to present an overview of the HySA Infrastructure CoC projects related to renewable hydrogen and fuel cell applications. The presentation will discuss how the HySA Infrastructure could assist telecommunication industry with providing a potential strategic platform for developing and testing various hydrogen generating solutions for fuel cell applications specific to African conditions. More specifically, the following enablers will be discussed: existing active projects for hydrogen production: solar-to-hydrogen demonstrations based on PEM electrolysis, ammonia-to-hydrogen projects for telecom, advanced PEM electrolysis concepts (high-current density operation), hydrogen storage, safety and codes, as well as close proximity of HySA Infrastructure to Gauteng, an economical hub of South Africa, commercialization road map, activities towards establishing “Platinum Valley” SEZ (special economic zone for Pt-related activities)
en
IEEE
Hydrogen
Batteries
Production
Fuel cells
Hydrogen storage
Industries
HySA infrastructure center of competence: a strategic collaboration platform for renewable hydrogen production and storage for fuel cell telecom applications
Presentation
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10394/19083
oai:v-des-dev-lnx1:10394/19083
2020-10-27 14:32:28.476
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/181602020-09-08T09:16:06Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Du Plessis, N.W.
Gouws, R.
11760052 - Gouws, Rupert
2016-08-05T11:41:19Z
2016-08-05T11:41:19Z
2013
Du Plessis, N. & Gouws, R. 2013. Design of a prototype power line inspection robot. Proceedings of the South African Universities Power Engineering Conference (SAUPEC): 104-109, Jan. [https://www.researchgate.net/publication/305556620_Design_of_a_prototype_power_line_inspection_robot]
978-1-86822-631-3
http://hdl.handle.net/10394/18160
https://www.researchgate.net/publication/305556620_Design_of_a_prototype_power_line_inspection_robot
The purpose of this paper is to provide the design of a prototype power line inspection
robot for the monitoring of Eskom transmission lines. It should also determine if an inspection robot
would be a feasible solution to aid Eskom in monitoring their lines for potential problems and should
also determine if it would be a viable financial choice to implement an inspection robot as to their
current inspection methods. The designed prototype robot must be capable of balancing on a
transmission line wire, should be capable of driving on it and to manoeuvre past certain obstacles that
are found on a transmission line. Tests were done to ensure that the robot is capable of performing
these tasks and other relevant tasks. The main reason for the prototype is to ensure a future
development platform for an inspection robot. In return it would result in a cost effective, easy to
maintain and a safer environment for the inspection staff
en
Transmission lines
manoeuvrability
centre of gravity
inspection robot
balancing
Design of a prototype power line inspection robot
Presentation
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oai:v-des-dev-lnx1:10394/18160
2020-09-08 11:16:06.678
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/182422020-08-19T13:58:06Zcom_10394_1865col_10394_1869
Le Roux, M.
Campbell, Q.P.
Van Rensburg, M.J.
Peters, E.S.
Stiglingh, C.
12413887 - Le Roux, Marco
10192247 - Campbell, Quentin Peter
21089906 - Van Rensburg, Martha Johanna
21683883 - Peters, Elmarie Sunette
22791310 - Stiglingh, Christel
2016-08-15T12:11:08Z
2016-08-15T12:11:08Z
2015
Le Roux, M. et al. 2015. Air drying of fine coal in a fluidized bed. Journal of the Southern African Institute of Mining and Metallurgy, 115(4):335-338. [https://doi.org/10.17159/2411-9717/2015/v115n4a10]
0038-223X
2411-9717 (Online)
http://hdl.handle.net/10394/18242
https://www.saimm.co.za/Journal/v115n04p335.pdf
https://doi.org/10.17159/2411-9717/2015/v115n4a10
The demand for energy has continued to rise worldwide in line with
population growth. The majority of South Africa’s electricity is supplied by
coal-fired power stations. The amount of fine coal (-2 mm) generated at
coal processing plants has increased, due mainly to mechanized mining
methods. Fine coal retains more water, which lowers its heating value.
Drying the coal is costly and it is difficult to achieve the required
moisture content. Consequently, coal fines are often discarded. An
estimated 8% of the total energy value of mined coal is lost1.
Fluidized bed technology is often used to dry coal thermally, but this
method is expensive and has an adverse environmental impact. The
objective of this study was to investigate the removal of moisture from fine
coal (<2 mm) in a fluidized bed operated with dry fluidizing air at moderate
temperatures as the drying agent. The effects of different air temperatures
and relative humidity levels were investigated in a controlled environment.
The study further investigated the influence of coal particle size on
moisture removal.
The drying rate was found to increase with increasing temperature. The
relative humidity of the drying air had a more pronounced effect on the
drying rate, even at temperatures as low as 25°C.. It became more
challenging to remove moisture as the particle size decreased. The gain in
calorific value was greater than the energy required to dry the coal
samples, showing that a fluidized bed using moderately warm dry air is an
energy-efficient drying technology. The energy efficiency of the fluidized
bed compared favourably with other thermal drying methods
Coaltech;
NRF (National Research Foundation), South Africa
en
SAIMM
coal fines
drying
fluidized bed
energy efficiency
Air drying of fine coal in a fluidized bed
Article
ORIGINAL
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Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/181042020-09-08T10:56:59Zcom_10394_1865col_10394_1869
Chauke, Gerald
Gouws, Rupert
11760052 - Gouws, Rupert
24052442 - Chauke, Gerald Vonani
2016-07-29T08:39:22Z
2016-07-29T08:39:22Z
2013
Chauke, G. & Gouws, R. 2013. Fly ash resistivity profiling for South African coal fired power stations. Journal of energy and power engineering, 7(12):2306-2311. [https://doi.org/10.17265/1934-8975/2013.12.012]
1934-8975
1934-8983 (Online)
http://hdl.handle.net/10394/18104
http://www.davidpublisher.org/Public/uploads/Contribute/559dd2fd18be7.pdf
https://doi.org/10.17265/1934-8975/2013.12.012
Particulate emission is a major problem in industrial processes, mainly power plants that make use of coal as a primary
source of energy. Stringent emissions limits, set by government organisations requires industries to conform to these limits to ensure
that air quality is sustained and with minimum pollutant present. Electrostatic precipitators are typically used to filter and collect these
particulate emissions. Fly ash resistivity is a primary parameter in the collection of particulate emissions, and there is a resistivity range
at which electrostatic precipitator collection is most efficient and anything outside this range limits, their operation. High resistivity ash
results in back-corona discharge, whilst low resistivity results in particle re-entrainment into the flue gas stream. The purpose of this
paper is to investigate and obtain a fly ash resistivity profile for existing power plants in South Africa. Ash samples obtained from
power plants are, tested making use of an ash-resistivity test oven, in accordance with IEEE Standard 548-1984. This paper discusses
obtained experimental results, to determine the resistivity profile at which South African power plant electrostatic precipitators operate.
The electrical efficiency of the electrostatic precipitator system is evaluated based on the obtained resistivity profiles
en
David Publishing
Electrostatic precipitator
fly ash
resistivity
back-corona
re-entrainment
Fly ash resistivity profiling for South African coal fired power stations
Article
ORIGINAL
Jnl energy power engineering-2013-2306.pdf
Jnl energy power engineering-2013-2306.pdf
application/pdf
349802
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18104/1/Jnl%20energy%20power%20engineering-2013-2306.pdf
1d93b6e2bd6da62a7338a4cdd8513a5b
MD5
1
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
2
TEXT
Jnl energy power engineering-2013-2306.pdf.txt
Jnl energy power engineering-2013-2306.pdf.txt
Extracted text
text/plain
20738
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9722fc8163d791ec5b19ff4000909c01
MD5
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Jnl energy power engineering-2013-2306.pdf.jpg
Jnl energy power engineering-2013-2306.pdf.jpg
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3011
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18104/6/Jnl%20energy%20power%20engineering-2013-2306.pdf.jpg
432c624861af53b643266924603ba8ba
MD5
6
10394/18104
oai:v-des-dev-lnx1:10394/18104
2020-09-08 12:56:59.917
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/181532020-09-08T14:10:16Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Visser, T.C.
Gouws, R.
11760052 - Gouws, Rupert
2016-08-05T07:57:58Z
2016-08-05T07:57:58Z
2013
Visser, T.C. & Gouws, R. 2013. Transmission line monitoring system for a power line inspection robot. Proceedings of the South African Universities Power Engineering Conference (SAUPEC): 127-132, Jan. [https://www.researchgate.net/publication/305556720_Transmission_line_monitoring_system_for_a_power_line_inspection_robot]
978-1-86822-631-3
http://hdl.handle.net/10394/18153
https://www.researchgate.net/publication/305556720_Transmission_line_monitoring_system_for_a_power_line_inspection_robot
Eskom has thousands-of-kilometres of transmission lines running across South Africa. The
current methods of overhead power line inspection (foot patrols and air inspections) have been
implemented for a long time now and are expensive and infrequent. The aim was to develop a
prototype monitoring system, which had to fit into a transmission line robot to collect information
from the power line and will allow a person to remotely (wirelessly) inspect the power line. The
hardware consists of a PandaBoard® (SBC) together with a 5 MP camera and GPS receiver to collect
information. High detail (resolution) photos of the power line covered the biggest problem faced on
the lines, namely: hardware fatigue. The evidence was then accessible on a website hosted by the
PandaBoard® via Wi-Fi. The solution is light weight, compact and has a low power consumption. The
monitoring system makes collecting evidence easy and fast. The results obtained by this prototype are
satisfactory as a concept for further development and can provide a feasible and improved solution for
monitoring of transmission lines for Eskom
en
Monitoring system
transmission line inspection
inspection robot
PandaBoard
Transmission line monitoring system for a power line inspection robot
Presentation
ORIGINAL
Conf-2013-Visser-Transmission_line_monitoring_system_for.pdf
Conf-2013-Visser-Transmission_line_monitoring_system_for.pdf
application/pdf
1173205
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18153/1/Conf-2013-Visser-Transmission_line_monitoring_system_for.pdf
bcca839fbe531aff26a2f6ab5c6f45bc
MD5
1
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
2
TEXT
Conf-2013-Visser-Transmission_line_monitoring_system_for.pdf.txt
Conf-2013-Visser-Transmission_line_monitoring_system_for.pdf.txt
Extracted text
text/plain
21460
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c6cdc421c8c98d2dd2b45188e1ec6ebf
MD5
5
THUMBNAIL
Conf-2013-Visser-Transmission_line_monitoring_system_for.pdf.jpg
Conf-2013-Visser-Transmission_line_monitoring_system_for.pdf.jpg
IM Thumbnail
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2760
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4fa843ad18cc2add1a39e3c291a75132
MD5
6
10394/18153
oai:v-des-dev-lnx1:10394/18153
2020-09-08 16:10:16.932
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/180662020-09-08T10:06:44Zcom_10394_1865col_10394_1869
Gouws, R.
Dobzhanskyi, O.
11760052 - Gouws, Rupert
24881902 - Dobzhanskyi, Oleksandr
2016-07-27T08:51:38Z
2016-07-27T08:51:38Z
2014
Gouws, R. & Dobzhanskyi, O. 2014. Efficiency analysis of a three-phase power transformer. Energize (4):61-65. [http://www.ee.co.za/wp-content/uploads/2014/04/energize-april-14-p-61-65.pdf]
1818-2127
http://hdl.handle.net/10394/18066
http://www.ee.co.za/wp-content/uploads/2014/04/energize-april-14-p-61-65.pdf
Metal, chemical, cement, concrete automobile, mining and other industries struggle to increase the efficiency of the energy they use.
Three-phase power transformers play significant role in terms of energy saving, so one method of improving efficiency is to ensure that power
transformers operate within their rated loads. However, many industries experience problems with inefficient power transformers
This paper was presented at the 2013 ICUE
conference and is republished here with
permission
en
EE Publishers
Efficiency analysis of a three-phase power transformer
Article
ORIGINAL
Energize-2014-April-p61.pdf
Energize-2014-April-p61.pdf
application/pdf
391252
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18066/1/Energize-2014-April-p61.pdf
fc5101d80ddee4464fdceb9573c66236
MD5
1
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
2
TEXT
Energize-2014-April-p61.pdf.txt
Energize-2014-April-p61.pdf.txt
Extracted text
text/plain
18560
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18066/7/Energize-2014-April-p61.pdf.txt
5d6578160788ef4d01a58cb5b00194ea
MD5
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THUMBNAIL
Energize-2014-April-p61.pdf.jpg
Energize-2014-April-p61.pdf.jpg
IM Thumbnail
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3410
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7b3f37812d877d383690fdcd1a23c1b3
MD5
8
10394/18066
oai:v-des-dev-lnx1:10394/18066
2020-09-08 12:06:44.244
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/33072020-09-07T12:53:55Zcom_10394_1865col_10394_1869
Du Rand, C.P.
Van Schoor, G.
Nieuwoudt, C.
11790199 - Du Rand, Carel Petrus
12134457 - Van Schoor, George
2010-08-04T15:35:17Z
2010-08-04T15:35:17Z
2009
Du Rand, C.P. et al. 2009. Enthalpy-entropy graph approach for the classification of faults in the main power system of a closed Brayton cycle HTGR. Annals of nuclear energy, 36(6):703-711. [https://doi.org/10.1016/j.anucene.2009.02.012]
0077-8923
1749-6632 (Online)
http://hdl.handle.net/10394/3307
https://www.sciencedirect.com/science/article/pii/S0306454909000735
https://doi.org/10.1016/j.anucene.2009.02.012
An enthalpy–entropy (h–s) graph approach for the classification of faults in a new generation type high temperature gas-cooled reactor (HTGR) is presented. The study is performed on a 165 MW model of the main power system (MPS) of the pebble bed modular reactor (PBMR) that is based on a single closed-loop Brayton thermodynamic cycle. In general, the h–s graph is a useful tool in order to understand and characterize a thermodynamic process. It follows that it could be used to classify system malfunctions from fault patterns (signatures) based on a comparison between actual plant graphs and reference graphs. It is demonstrated that by applying the h–s graph approach, different fault signatures are derived for the examined fault conditions. The fault conditions that are considered for the MPS are categorized in three fault classes and comprise the main flow bypass of the working fluid, an increase in main flow resistance, and a decrease in component effectiveness or efficiency. The proposed approach is specifically illustrated for four single and two multiple fault conditions during normal power operation of the plant. The simulation of the faults suggests that it is possible to classify all of the examined system malfunctions correctly with the h–s graph approach, using only single reference fault signatures
Elsevier
Enthalpy-entropy graph approach for the classification of faults in the main power system of a closed Brayton cycle HTGR
10394/3307
oai:v-des-dev-lnx1:10394/3307
2020-09-07 14:53:55.153
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/191902019-06-25T14:11:37Zcom_10394_1865col_10394_1869
Wissing, Daniel Petrus
dd3da2bd-df6c-4a83-918e-c297cb8cff31
Pienaar, Wikus
ef44a4c0-5b5b-41e4-9536-3fdbc84b2c7e
Van Niekerk, Daniel Rudolph
0c40c3d0-ad70-4b7a-b109-f995259eb7e1
20305893 - Pienaar, Wikus
10171347 - Wissing, Daniel Petrus
2016-10-25T14:09:01Z
2016-10-25T14:09:01Z
2015
Wissing, D.P. et al 2015. Palatalisation of /s/ in Afrikaans. Spil Plus, 48:137–158. [ http://dx.doi.org/10.5842/48-0-688 ]
1726–541X
2224-3380 (online)
http://hdl.handle.net/10394/19190
http://dx.doi.org/10.5842/48-0-688
This article reports on the investigation of the acoustic characteristics of the Afrikaans voiceless alveolar fricative /s/$^2$. As yet, a palatal [$\int$] for /s/ has been reported only in a limited case, namely where /s/ is followed by palatal /j/, for example in the phrase is jy ( “are youˮ ), pronounced as [ǝ–$\int$ǝi]. This seems to be an instance of regressive coarticulation, resulting in coalescence of basic /s/ and /j/. The present study revealed that, especially in the pronunciation of young, white Afrikaans–speakers, /s/ is also palatalised progressively when preceded by /r/ in the coda cluster /rs/, and, to a lesser extent, also in other contexts where /r/ is involved, for example across syllable and word boundaries. Only a slight presence of palatalisation was detected in the production of /s/ in the speech of the white, older speakers of the present study. This finding might be indicative of a definite change in the Afrikaans consonant system. A post hoc reflection is offered here on the possible presence of /s/–fronting, especially in the speech of the younger females. Such pronunciation could very well be a prestige marker for affluent speakers of Afrikaans.
en
Department of General Linguistics, Stellenbosch University
Afrikaans
Acoustic features
Centre of Gravity
Palatalisation
/s/-fronting
Voiceless sibilant fricatives
Palatalisation of /s/ in Afrikaans
Article
ORIGINAL
Wissing & Pienaar_2015.pdf
Wissing & Pienaar_2015.pdf
application/pdf
650045
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/19190/1/Wissing%20%26%20Pienaar_2015.pdf
1986b3b1acedc3c245ed50618375adc4
MD5
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Wissing & Pienaar_2015.pdf.txt
Wissing & Pienaar_2015.pdf.txt
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62243
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2c2d1b9d3946c58240bd3cb93f50d58e
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Wissing & Pienaar_2015.pdf.jpg
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fcc8a0565a9a04f8cf45a44d1221f016
MD5
5
10394/19190
oai:v-des-dev-lnx1:10394/19190
2019-06-25 16:11:37.277
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/33102020-11-04T13:28:04Zcom_10394_1865col_10394_1869
Van Schoor, George
Neser, Morné
12134457 - Van Schoor, George
2010-08-04T15:35:17Z
2010-08-04T15:35:17Z
2009
Van Schoor, G. & Neser, M. 2009. Object-oriented embedded C. SAIEE Africa research journal, 100(4):90-96. [https://doi.org/10.23919/SAIEE.2009.8531856]
1991-1696
http://hdl.handle.net/10394/3310
https://doi.org/10.23919/SAIEE.2009.8531856
https://ieeexplore.ieee.org/document/8531856
This paper presents an object-oriented implementation of ANSI-C for embedded systems.
It offers practical guidelines for producing generic software libraries and portable applications. While
various object-oriented implementations of C is available, the aim is to impress a culture of producing
safe, robust embedded software which can easily be shared and integrated amongst developers and
systems. Starting from coding standards, a design philosophy is proposed for creating reusable
drivers, services, applications and finally, a complete real-time operating system.
IEEE
Modular design
Coding standards
Real-time
Operating system
Object-oriented embedded C
10394/3310
oai:v-des-dev-lnx1:10394/3310
2020-11-04 15:28:04.172
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/73962020-09-02T09:35:09Zcom_10394_1865col_10394_1869
Legg, Murray
Mathews, Edward
Pelzer, Ruaan
10477438 - Mathews, Edward Henry
12674818 - Pelzer, Ruaan
21078017 - Legg, Murray Christopher
2012-09-18T09:55:26Z
2012-09-18T09:55:26Z
2012
Legg, M. et al. 2012. The design and development of a stented tissue mitral and aortic heart valve replacement for human implantation. Cardiovascular journal of Africa, 23(3):126-130. [http://www.cvja.co.za/onlinejournal/vol23/vol23_issue3/files/assets/basic-html/index.html#8]
1995-1892
1996-3467 (Online)
http://hdl.handle.net/10394/7396
http://www.cvja.co.za/onlinejournal/vol23/vol23_issue3/files/assets/basic-html/index.html#8
CVJA is the official journal of the PASCAR (Pan African Society of Cardiology)
A study was conducted into the development of a mitral and aortic heart valve replacement that caters for patients having suffered valve damage due to stenosis or rheumatic fever. The appeal of the valve is that it is constituted from a solid frame housing pericardial tissue leaflets, and allows the patient freedom from post-operative blood-thinning medication. The valve is designed to appeal to patients in developing areas of the world, as it features a clip-in mechanism to secure the valve assembly into the sewing ring, which is stitched in independently of the frame and leaflets. Re-operative valve replacement would then be made possible when the pericardial leaflets began to calcify. Novel aspects of the design added value to the science of heart valve replacements, through the use of sintered chrome cobalt in the valve components, the insights gained into mechanical testing of pericardium, and the patient benefits offered by the complete design. Further work is planned to fatigue test the assembly, undergo animal trials and make the valve available for commercial use.
en
Clinics Cardive
Aortic valve replacement
mitral valve replcement
tissue valve
The design and development of a stented tissue mitral and aortic heart valve replacement for human implantation
Article
10394/7396
oai:v-des-dev-lnx1:10394/7396
2020-09-02 11:35:09.572
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/180922020-09-08T14:07:20Zcom_10394_1865col_10394_1869
Gouws, R.
Van Jaarsveldt, H.
11760052 - Gouws, Rupert
2016-07-27T13:36:08Z
2016-07-27T13:36:08Z
2012
Gouws, R. & Van Jaarsveldt, H. 2012. Thermal and efficiency analysis of a single phase induction motor with Peltier devices. World journal of engineering, 9(1):63-70. [ https://doi.org/10.1260/1708-5284.9.1.63]
1708-5284
http://hdl.handle.net/10394/18092
https://www.emerald.com/insight/content/doi/10.1260/1708-5284.9.1.63/full/html
https://doi.org/10.1260/1708-5284.9.1.63
We present the results obtained from the thermal and efficiency analysis of a single phase
induction motor with Peltier devices. A single phase induction motor is completely simulated in
SolidWorks® and Matlab® Simulink®. The cooling of the induction motor is done by means of
Peltier devices and the corresponding power consumption and stator temperature is recorded.
From the SolidWorks® simulation results it can be seen that the temperature of the induction motor
under normal operating conditions is cooled from 68°C to 35°C. From the Matlab® Simulink®
simulation results show that the efficiency of the induction motor is increased by an average of
3.73% from the normal operating condition to the cooled operating condition with the inclusion of
the Peltier devices onto the system
en
Emerald
Peltier devices
single phase induction motor
energy efficiency
thermal analysis
Thermal and efficiency analysis of a single phase induction motor with Peltier devices
Article
ORIGINAL
World jnl engineering-2012-9(1)-63.pdf
World jnl engineering-2012-9(1)-63.pdf
application/pdf
1597119
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18092/1/World%20jnl%20engineering-2012-9%281%29-63.pdf
703f8f6bfbdb738c137da851dacffd25
MD5
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license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18092/2/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
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TEXT
World jnl engineering-2012-9(1)-63.pdf.txt
World jnl engineering-2012-9(1)-63.pdf.txt
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22767
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18092/5/World%20jnl%20engineering-2012-9%281%29-63.pdf.txt
041abed4c2795505d05b4144f7eb9265
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World jnl engineering-2012-9(1)-63.pdf.jpg
World jnl engineering-2012-9(1)-63.pdf.jpg
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0370625c783fdd2ae3e13d48993b32ac
MD5
6
10394/18092
oai:v-des-dev-lnx1:10394/18092
2020-09-08 16:07:20.614
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/25682020-06-25T10:02:09Zcom_10394_1865col_10394_1869
Van Dyk, J.C.
Waanders, F.B.
Van Heerden, J.H.P.
10059571 - Waanders, Frans Boudewijn
2009-11-17T12:01:01Z
2009-11-17T12:01:01Z
2008
Van Dyk, J.C. et al. 2008. Quantification of oxygen capture in mineral matter during gasification. Fuel, 87(12):2735-2744. [https://doi.org/10.1016/j.fuel.2008.02.013]
0016-2361
http://hdl.handle.net/10394/2568
https://www.sciencedirect.com/science/article/pii/S0016236108000689
https://doi.org/10.1016/j.fuel.2008.02.013
It has been observed that during the transformation of minerals at higher temperatures (>1000 °C), mineral species are formed containing a high number of oxygen molecules, i.e. gehlenite (Ca2Al2SiO7), mullite (Al6Si3O15), margarite (CaAl4Si2O10(OH)2) and almandine (Fe3Al2Si3O12).
Results of the coal sources evaluated in this investigation indicated significant differences in mineral elemental composition, i.e. the CaO content varied between 5 mass % and 10 mass %, the Fe2O3 content varied between 1.6 mass % to more than 5 mass %, as well as differences in the TiO2, P2O5 and MgO content. The coal sources producing the highest concentration of Ca–Al–Si species (CaAl2Si2O8 anorthite and CaAl4Si2O10(OH)2 margarite), which crystallized from the slag-liquid phase during the combustion stage, also contained the highest amount of acidic components or highest percentage of kaolinite. The highest concentration of mullite and free SiO2 after the gasification reaction (before the combustion zone), also resulted in the highest concentration of Ca–Al–Si compounds forming during the oxidation phase. The free-SiO2 in the mineral structure of the coal sources resulted then in the formation of mineral structures with Mg, Na or Ca when present in the mineral structure, to form new mineral compounds such as KAl3Si3O10(OH)2 (muscovite), Mg5Al2Si3O10(OH)8 (clinochlore), or other high oxygen molecule-containing mineral compounds. Thus, if free-SiO2 was not present after the gasification phase, and mostly taken up in the form of anorthite (due to high or higher CaO contents or Fe-contents in high Fe-containing coal sources), the concentration of Si-oxygen capture compounds are relatively low.
An acceptable linear correlation between oxygen capture tendencies (increase in mineral matter content during the combustion phase) versus CaO-content was obtained with the South African coal sources evaluated. This confirmed the observations obtained based on HT-XRD and FactSage modelling. It can be concluded that the linear model to predict oxygen capture behavior from CaO-content is acceptable and can be used as a predictive tool. The SiO2 content, for example, has an inverse affect on oxygen trends up to a specific concentration of CaO in the coal. However, this model is only valid for the coal types tested (South African Highveld coal sources), and additional test work will have to be conducted for other coal types, i.e. northern hemisphere coal
en
Elsevier
Fixed bed gasification
Mineral structure
Oxygen capture
HT-XRD
FactSage
Quantification of oxygen capture in mineral matter during gasification
Article
LICENSE
license.txt
license.txt
text/plain
1751
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/2568/2/license.txt
ad25a4780ee9bee68a3e17892463d77f
MD5
2
10394/2568
oai:v-des-dev-lnx1:10394/2568
2020-06-25 12:02:09.749
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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oai:repository.nwu.ac.za:10394/27762020-08-18T10:53:47Zcom_10394_1865col_10394_1869
Van Dyk, J.C.
Waanders, F.B.
Hack, K.
10059571 - Waanders, Frans Boudewijn
2010-02-01T07:40:52Z
2010-02-01T07:40:52Z
2008
Van Dyk, J.C. et al. 2008. Behaviour of calcium-containing minerals in the mechanism towards in situ CO2 capture during gasification. Fuel, 87(12):2388-2393. [https://doi.org/10.1016/j.fuel.2008.03.015]
0016-2361
http://hdl.handle.net/10394/2776
https://www.sciencedirect.com/science/article/abs/pii/S0016236108001129
https://doi.org/10.1016/j.fuel.2008.03.015
Mineral matter transformation and the behavior of mineral matter in the coal during gasification, provide more information on the suitability of a specific coal source for combustion or gasification purposes. Therefore, the chemistry and mineral interactions have to be understood in order to determine the suitability for fixed bed gasification purposes with regards to mineral matter transformations and slagging properties.
Although a suite of minerals important for the gasification process were identified [Van Dyk JC, Melzer S, Sobiecki A. Mineral matter transformations during Sasol-Lurgi fixed bed dry bottom gasification – utilization of HT-XRD and FactSage modelling. Minerals Engineering 2006; 19: 1126–35], some of the minerals, i.e. anorthite and calcite, with a specific behavior at different concentrations in the mineral structure and the transformation thereof was not studied and highlighted in detail. A number of other researchers [Reifenstein AP, Kahraman H, Coin CDA, Calos NJ, Miller G, Uwins P. Behavior of selected minerals in an improved ash fusion test: quartz, potassium feldspar, sodium feldspar, kaolinite, illite, calcite, dolomite, siderite, pyrite and apatite. Fuel 1999; 78: 1449–61], [Kondratiev A, Jaks E. Predicting coal ash slag flow characteristics (viscosity model for the Al2O3–CaO–‘FeO’–SiO2 system). Fuel 2001; 80: 1989–2000] and [Kondratiev A, Jak E. Applications of the coal ash slag viscosity model for the slagging gasification technologies (viscosity model in the Al2O3–CaO–‘FeO’–SiO2 system), 18th Pittsburgh Coal Conference, Newcastle, Australia, December 2001]) also did not investigate these gasification changes and mineralogical deformation during specific gasification conditions in detail.
The principle aim of this paper is to identify the role of Ca-containing mineral species towards the in situ capture of CO2 during gasification, as well as understanding the chemistry and interpret the mechanism of CO2 capture by means of high temperature X-ray diffraction (HT-XRD), in combination with FactSage modeling. The CaO content of a South African and another coal source investigated in the present study, were 6 mass% and 30 mass% respectively. The basic components present in the coal, or specifically CaO, only act as a fluxing component up to a specific percentage, where after the ash fusion temperature starts to increase again. At this turning point the (Si+Al):Ca molar mass ratio is 2.75, which implies that after the turning point, the formation of anorthite is maximized and can thereafter only remain at the same level.
The anorthite formation, when the Ca content increases, follows the inverse trend of the ash flow temperature prediction curve with the coal containing 6% CaO. The decrease in anorthite formation, with increasing Ca content, after the turning point in the graph, can be explained by the fact that more of the crystalline phase becomes a liquid (slag), and thus also the increase in the amount CaO in the slag will be observed. At the turning point, it is also interesting to note the stabilisation of the amount of other Ca-containing species. These are the minerals that are responsible and available for the mechanism where CO2 can be captured on Ca to form CaCO3. The formation of CaCO3 can also be observed from the turning point where the (Si+Al):Ca molar mass ratio is <2.75, which corresponds with the formation of other Ca-containing species.
Thermodynamic modeling with FactSage results indicated that anorthite can only form to the point where the (Si+Al):Ca molar mass ratio is >2.75. Anorthite (CaSi2Al2O8) forms within the gasification zone and all non-reacted Ca react with CO2 to form CaCO3 further down in the combustion zone
en
Elsevier
CO2 capture
Ca-content
Gasification
Mineral matter
Behaviour of calcium-containing minerals in the mechanism towards in situ CO2 capture during gasification
Article
LICENSE
license.txt
license.txt
text/plain
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oai:v-des-dev-lnx1:10394/2776
2020-08-18 12:53:47.188
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/138742020-08-18T12:26:48Zcom_10394_1865col_10394_1869
Mangena, S.J.
Bunt, J.R.
Waanders, F.B.
10059571 - Waanders, Frans Boudewijn
20164200 - Bunt, John Reginald
2015-05-29T09:40:44Z
2015-05-29T09:40:44Z
2013
Mangena, S.J. et al. 2013. Physical property behaviour of North Dakota lignite in an oxygen/steam blown moving bed gasifier. Fuel processing technology, 106:326-331. [https://doi.org/10.1016/j.fuproc.2012.08.016]
0378-3820
http://hdl.handle.net/10394/13874
https://www.sciencedirect.com/science/article/pii/S0378382012003098
https://doi.org/10.1016/j.fuproc.2012.08.016
In this study lignite originating from North Dakota (USA) was thermally treated in an oxygen/steam blown
commercial-scale moving bed gasifier operating on lump coal at the Dakota Gasification Company (DGC)
in order to identify the physical property changes that occur during heating. After reaction, the solid particulate
remnants were extracted from the reactor and characterised using standard techniques. Thermal fragmentation
was found to be severe with the coal tested, i.e. the lump coal was found to decrease in size to
about 90% b6.3 mm particles in the drying and de-volatilisation zones of the reactor. The particle size
(mean Sauter diameter) however increased slightly in the reduction and combustion zones due to ash melting
and subsequent agglomeration. The particle as well as the bulk density residual profiles of the fuel bed
samples in the reactor was found to be in alignment with the residual ash content profile. The ash fusion temperature
(AFT) of the feed coal to the commercial-scale moving-bed gasifier was found to be higher as compared
to the ash bed. Fluxing elements in the dominating glass phase determined in the reduction and
combustion zones are most probably the reason behind this phenomenon.
en
Elsevier
Coal
lignite
particle size distribution
density
ergun index
ash fusion temperature
Physical property behaviour of North Dakota lignite in an oxygen/steam blown moving bed gasifier
Article
10394/13874
oai:v-des-dev-lnx1:10394/13874
2020-08-18 14:26:48.305
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/180892020-09-08T13:32:29Zcom_10394_10929com_10394_1865col_10394_10933col_10394_1869
Van Rooyen, T.
Gouws, R.
22144153 - Van Rooyen, Tian
11760052 - Gouws, Rupert
2016-07-27T12:57:29Z
2016-07-27T12:57:29Z
2014
Van Rooyen, T. & Gouws, R. 2014. Ontwerp van ’n transmissielyn-monteringsoplossing vir ’n onbemande vier-rotor helikopter. South African journal of science and technology, 33(1):#1211. [https://doi.org/10.4102/satnt.v33i1.1211]
0254-3486
2222-4173 (Online)
http://hdl.handle.net/10394/18089
https://journals.satnt.aosis.co.za/index.php/satnt/article/view/1211/2536
https://doi.org/10.4102/satnt.v33i1.1211
A need
exists for a transmission line monitoring system for use by Eskom to inspect transmission
lines. A solution which uses a single board computer, visual and infrared cameras and a
GPS module is described. Real-time data streaming from the cameras, GPS and fault logging
capability was achieved
Student
Symposium in Science, 07
and 08 November 2013,
University of Pretoria,
South Africa
other
AOSIS
Ontwerp van ’n transmissielyn-monteringsoplossing vir ’n onbemande vier-rotor helikopter
Design of a transmission line monitoring solution for an unmanned quadcopter
Presentation
ORIGINAL
SA Jnl Science Tech-2014-33-VanRooyen & Gouws.pdf
SA Jnl Science Tech-2014-33-VanRooyen & Gouws.pdf
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license.txt
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SA Jnl Science Tech-2014-33-VanRooyen & Gouws.pdf.txt
SA Jnl Science Tech-2014-33-VanRooyen & Gouws.pdf.txt
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10394/18089
oai:v-des-dev-lnx1:10394/18089
2020-09-08 15:32:29.664
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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oai:repository.nwu.ac.za:10394/58882016-04-28T09:34:43Zcom_10394_1865col_10394_1869
Du Toit, Charl Gabriel De Kock
f337b48b-b3fb-4592-99a0-46f787055829
-1
Rousseau, Pieter Gerhardus
375a423a-fa23-4759-a898-bce6f1aece1d
-1
Van Antwerpen, Werner
ca65c436-2985-4ab4-a0cb-3bd09c91033e
-1
2012-02-29T09:49:11Z
2012-02-29T09:49:11Z
2010
Du Toit, C.G.D.K., Rousseau, P.G. & Van Antwerpen, W. 2010. A review of correlations to model the packing structure and effective thermal conductivity in packed beds of mono-sized spherical particles. Nuclear engineering and design, 240(7):1803-1818, Jul. [http://www.sciencedirect.com/science/journal/00295493] [http://www.elsevier.com/wps/find/journaldescription.cws_home/505661/description]
0029-5493
http://hdl.handle.net/10394/5888
http://dx.doi.org/10.1016/j.nucengdes.2010.03.009
Elsevier
A review of correlations to model the packing structure and effective thermal conductivity in packed beds of mono-sized spherical particles
10394/5888
oai:v-des-dev-lnx1:10394/5888
2016-04-28 11:34:43.197
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/78722016-04-28T09:34:55Zcom_10394_1865col_10394_1869
Grobler, Magdalena Johanna
63f2a5bc-ad44-47ab-afd7-21c8ed227086
-1
Helberg, Albertus Stephanus Jacobus
bbfc777b-43c7-4a7f-83b3-7eb735a84e1f
-1
2013-01-11T12:59:21Z
2013-01-11T12:59:21Z
2011
Grobler, M.J. & Helberg, A.S.J. 2011.Identifying opportunities for deterministic network coding in wireless mesh networks. Africa Research Journal , 102(1):8-15. [http://www.saiee.org.za/content.php?pageID=349]
1991-1696
http://hdl.handle.net/10394/7872
Transactions of the South African Insitute of Electrical Engineers
Recent advances in methods to improve network utilisation has lead to the introduction of Network Coding, a technique that can reduce local congestion in a network by combining information sent over the network. In this paper the use of deterministic Network Coding in a Wireless Mesh Network (WMN) is proposed. A method to determine where Network Coding can be implemented in a WMN is presented. It is shown that the inherent properties of WMNs provide good opportunities for the implementation of this method.
en
SAIEE Publishers
Capacity
network coding
network topology
network utilisation
quality of service
wireless mesh networks
Identifying opportunities for deterministic network coding in wireless mesh networks
Article
10394/7872
oai:v-des-dev-lnx1:10394/7872
2016-04-28 11:34:55.154
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/276932018-06-19T13:26:49Zcom_10394_1865col_10394_1869
De Medeiros, Diego
44cc2f35-2a02-4aa9-8438-d03929ecc76c
600
Waanders, F.
96a3b4d0-272b-4dfa-8efc-7410357d9c1b
600
Oliveira, M.
15e3dbb4-b93d-4a74-b8da-8c804d05fbd8
600
Lima, B.
33646d61-b307-4815-9649-5c6bb2585cb4
600
Silva, L.
21200d21-41a0-4e8c-b65e-b700c7f2fa2d
600
10059571 - Waanders, Frans Boudewijn
2018-06-19T13:25:26Z
2018-06-19T13:25:26Z
2016
De Medeiros, D. et al. 2016. Geochemical mobility of potential hazardous elements of coal cleaning rejects. 33rd Annual International Pittsburgh Coal Conference (IPCC 2016). Coal: energy, environment and sustainable development, Cape Town, South Africa, 8-12 Aug. 2016:1687. [http://toc.proceedings.com/37637webtoc.pdf]
978-1-5108-5366-9
http://hdl.handle.net/10394/27693
http://toc.proceedings.com/37637webtoc.pdf
en
International Pittsburgh Coal Conference
Geochemical mobility of potential hazardous elements of coal cleaning rejects
Presentation
LICENSE
license.txt
license.txt
text/plain
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
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10394/27693
oai:v-des-dev-lnx1:10394/27693
2018-06-19 15:26:49.09
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/138732020-08-18T12:22:14Zcom_10394_1865col_10394_1869
Mangena, S.J.
Bunt, J.R.
Waanders, F.B.
20164200 - Bunt, John Reginald
10059571 - Waanders, Frans Boudewijn
2015-05-29T09:28:09Z
2015-05-29T09:28:09Z
2013
Mangena, S.J. et al. 2013. Mineralogical behaviour of North Dakota lignite in an oxygen/steam blown moving bed reactor. Fuel processing technology, 106:474-482. [https://doi.org/10.1016/j.fuproc.2012.09.015]
0378-3820
http://hdl.handle.net/10394/13873
https://www.sciencedirect.com/science/article/pii/S0378382012003311
https://doi.org/10.1016/j.fuproc.2012.09.015
In this study, lignite fromNorth Dakota (USA)was thermally treated in a commercial-scale oxygen/steamblown
moving bed reactor at the Dakota Gasification Conpany (DGC) in order to identify mineralogical changes that
occur during the conversion process. After reaction, the solid particulate remnants were extracted from the
reactor reaction zones and characterised using XRD, CCSEM and SEMPC techniques. It was found that the feed
coal mineralization was mainly dominated by organically bound calcium. On the other hand, the crystalline
phases present in the hottest regions of the reactor were governed by gehlenite and bredigite which may have
formed from the transformation, (at higher temperatures), of the organically bound Ca and Mg to form CaO
and MgO and subsequent interaction with the reactive silica and transformation products of the clays. A significant
amount of calcitewas found to develop at the start of the reduction zone; it is suggested that the calcitewas
synthesised fromthe reaction of CaO (formed fromthe transformation of the organically bound Ca)with the CO2
from the product gas in the reactor, in agreementwith the literature. The glass phase was found to constitute the
major part of the ash mineral assemblage in the reduction and combustion zones of the reactor. This phase was
composed mainly of the Ca, Mg, Na aluminosilicates with some Fe. There was therefore a significant amount of
melting that occurred in the hotter reaction zones (i.e. reduction and combustion zones) of the reactor. The
organically bound Ca, Mg and Na seemed to have played a significant role in the formation of this glass phase.
en
Elsevier
Moving-bed gasification
coal
mineralogy
XRD
CCSEM
SEMPC
Mineralogical behaviour of North Dakota lignite in an oxygen/steam blown moving bed reactor
Article
10394/13873
oai:v-des-dev-lnx1:10394/13873
2020-08-18 14:22:14.543
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/28422016-04-28T09:33:57Zcom_10394_1865col_10394_1869
Grobler, Louis
fed3f1de-14ae-4e67-a12a-efeecd81f289
-1
Masoso, Okatoseng Tsametse
f87ebcd5-0362-4197-9dbc-b296a62434fe
-1
2010-02-24T05:55:09Z
2010-02-24T05:55:09Z
2008
GROBLER, L. & MASOSO, O.T. 2008. A new and innovative look at anti-insulation behaviour in building energy consumption. Energy and buildings, 40(10):1889-1894. [ttp://www.elsevier.com/wps/find/journaldescription.cws_home/504083/description#description]
0378-7788
http://hdl.handle.net/10394/2842
http://dx.doi.org/doi:10.1016/j.enbuild.2008.04.013
en
Elsevier Science Limited
A new and innovative look at anti-insulation behaviour in building energy consumption
Article
LICENSE
license.txt
license.txt
text/plain
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1e662d2cd15151bfa6d995c82917b3ec
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10394/2842
oai:v-des-dev-lnx1:10394/2842
2016-04-28 11:33:57.549
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/181172020-09-08T10:40:04Zcom_10394_1865col_10394_1869
Gouws, Rupert
11760052 - Gouws, Rupert
2016-08-01T10:42:24Z
2016-08-01T10:42:24Z
2012
Gouws, R. 2012. Environmental impact of an industrial compressed air system with a solar powered compressor in South Africa. Energy and environment: 1327-1337. [https://doi.org/10.1260/0958-305X.23.8.1327]
0958-305X
http://hdl.handle.net/10394/18117
https://journals.sagepub.com/doi/10.1260/0958-305X.23.8.1327
https://doi.org/10.1260/0958-305X.23.8.1327
Almost 14% of the electricity generated by the national energy supplier (Eskom)
in South Africa is sold directly to the mining sector and almost 20% is utilized
directly by the compressed air systems of the mining sector. The industrial
compressed air systems in South Africa therefore have a substantial impact on the
environment in terms of emissions output. In this paper a solar powered
compressor is installed parallel to an existing industrial compressed air system.
The environmental (emissions) impact and energy consumption of the industrial
compressed air system with the solar powered compressor is calculated and the
results are provided. It is shown from the results that the solar powered air
compressor improved the overall system efficiency and lowered the carbon
footprint of the industrial compressed air system. The impact of the energy
improvement on the amount of trees required to offset the calculated amount of
CO2 is also provided
en
Sage
Industrial compressed air
solar power
energy efficiency
emissions impact
Environmental impact of an industrial compressed air system with a solar powered compressor in South Africa
Article
ORIGINAL
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oai:v-des-dev-lnx1:10394/18117
2020-09-08 12:40:04.578
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/180992020-09-08T10:28:14Zcom_10394_1865col_10394_1869
Gouws, Rupert
11760052 - Gouws, Rupert
2016-07-29T07:30:05Z
2016-07-29T07:30:05Z
2013
Gouws, R. 2013. Energy management by means of fault conditions on active magnetic bearing systems. International journal of emerging trends in electrical and electronics, 8(1):35-38. [http://www.iret.co.in/index.html]
2320-9569
http://hdl.handle.net/10394/18099
http://www.iret.co.in/Docs/IJETEE/Volume%208/Issue1/7.%20Energy%20Management%20by%20Means%20of%20Fault%20Conditions%20on%20Active%20Magnetic%20Bearing%20Systems.pdf
This paper presents the use of fault conditions on
active magnetic bearing (AMB) systems as an energy
management tool to improve the operation of AMB systems.
Fault conditions on AMB system are broadly classified into
external faults and internal faults, where external faults
normally have some external disturbance acting on the system.
These external disturbances will always have a transient
component and possibly a steady state component. Internal fault
conditions mostly refer to signal processing faults or failures. It
can be seen that by analyzing these fault conditions, the
operation of the AMB system can be improved. The use of fault
condition on AMB systems therefore provides a valuable energy
management tool
en
IRET (Institute of Research in Engineering and Technology)
Energy management
active magnetic bearings
fault conditions
failures
Energy management by means of fault conditions on active magnetic bearing systems
Article
LICENSE
license.txt
license.txt
text/plain
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10394/18099
oai:v-des-dev-lnx1:10394/18099
2020-09-08 12:28:14.75
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/93982020-08-18T13:07:27Zcom_10394_1865col_10394_1869
Venter, W.C.
Lamprecht, E.C.
10063218 - Venter, Willem Christiaan
2013-10-30T12:20:56Z
2013-10-30T12:20:56Z
2012
Venter, W.C. & Lamprecht, E.C. 2012. Pebble Bed Micro Model system identification. Annals of nuclear energy, 46:1-10. [https://doi.org/10.1016/j.anucene.2012.02.019]
0306-4549
1873-2100 (Online)
http://hdl.handle.net/10394/9398
https://www.sciencedirect.com/science/article/pii/S0306454912000655
https://doi.org/10.1016/j.anucene.2012.02.019
Linear system identification techniques will be applied to obtain mathematical models of a simulation of the Pebble Bed Micro Model (PBMM). The PBMM is a conceptual model of the Pebble Bed Modular Reactor (PBMR), a new high temperature gas nuclear reactor. The basis of the PBMR and PBMM is a three-phase Brayton Power Generation Cycle. The Brayton cycle will in this paper be simulated by the use of Flownex, a general thermal-fluid network analysis code solver. A description of the Brayton Power Generation Cycle, as well as description of the Flownex modelling program, will also be given.
en
Elsevier
Nuclear reactor
system identification
mathematical models
Pebble Bed Micro Model system identification
Article
10394/9398
oai:v-des-dev-lnx1:10394/9398
2020-08-18 15:07:27.18
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/138312020-09-02T10:25:51Zcom_10394_1865col_10394_1869
Du Plessis, Gideon Edgar
Liebenberg, Leon
Mathews, Edward Henry
Du Plessis, Johan Nicolaas
12850071 - Liebenberg, Leon
10477438 - Mathews, Edward Henry
24046744 - Du Plessis, Gideon Edgar
20036353 - Du Plessis, Johan Nicolaas
2015-05-18T13:32:36Z
2015-05-18T13:32:36Z
2013
Du Plessis, G.E. et al. 2013. A versatile energy management system for large integrated cooling systems. Energy conversion and management. 66:312-325. [https://doi.org/10.1016/j.enconman.2012.12.016]
0196-8904
http://hdl.handle.net/10394/13831
https://www.sciencedirect.com/science/article/abs/pii/S0196890412004761
https://doi.org/10.1016/j.enconman.2012.12.016
Large, energy intensive cooling systems are found on deep level mines to supply chilled service water and
cool ventilation air to the mine. The need exists for a simple, real-time energy management tool for large,
integrated cooling systems. A versatile energy management system was developed for the large cooling
systems of deep mines as a typical example of a generic systems-based energy management tool. The system
connects to the SCADA systems of mines and features a hierarchical control function. Set points of
various subsystems are optimised in real-time by means of an integrated, systems approach. Real-time
monitoring and automatic reporting functions support integrated energy management. In this paper,
the development and viability of the system as a practical and versatile energy management platform
are presented. In situ experimental results from implementation on four large cooling systems of different
designs, sizes and requirements are considered to investigate the potential for such energy management
tools. An average electrical energy saving of 33.3% is realised for all the sites without adversely affecting
mine cooling requirements. The potential for application to other large cooling systems is also shown.
en
Elsevier
Energy management system
large cooling system
mine cooling
real-time control
A versatile energy management system for large integrated cooling systems
Article
10394/13831
oai:v-des-dev-lnx1:10394/13831
2020-09-02 12:25:51.736
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/180782020-09-08T14:12:52Zcom_10394_1865col_10394_1869
Zabihi, Nima
Gouws, Rupert
Dobzhanskyi, Oleksandr
11760052 - Gouws, Rupert
24881902 - Dobzhanskyi, Oleksandr
2016-07-27T10:46:51Z
2016-07-27T10:46:51Z
2014
Zabihi, N. et al. 2014. Using dynamic model of PEM-Fuel Cell supplying the load by the Z-source inverter with a novel control strategy. International journal of research in engineering and applied sciences, 2(2):54-59. [https://www.researchgate.net/publication/305412130_USING_DYNAMIC_MODEL_OF_PEM-FUEL_CELL_SUPPLYING_THE_LOAD_BY_THE_Z-SOURCE_INVERTER_WITH_A_NOVEL_CONTROL_STRATEGY]
2249-9210
2348-1862 (Online)
http://hdl.handle.net/10394/18078
https://www.researchgate.net/publication/305412130_USING_DYNAMIC_MODEL_OF_PEM-FUEL_CELL_SUPPLYING_THE_LOAD_BY_THE_Z-SOURCE_INVERTER_WITH_A_NOVEL_CONTROL_STRATEGY
A new dynamic model is developed in this paper to connect PEM Fuel Cell (PEMFC) to a Z-source inverter (ZSI). This
model is used to analyse the behaviour of a fuel cell by providing a polarization curve. A controller is designed based on
an interpolation to spot parameters of PEM Fuel Cell such as temperature (or anode and cathode pressure). A current
feedback is gained to regulate the output voltage through determination of physical parameters. The ZSI is used in the
proposed model to generate AC power. In this research, to compensate the voltage drop of fuel cell the capacitor voltage
of the Z-network is controlled using the state space averaging method to stabilize the AC output voltage of the ZSI.
Simulation and experimental results verify the validity of the proposed controlling model
en
Staff Research Council of Yeshwantrao Chavan College of Engineering (YCCE) , Nagpur, India
Z-source inverter
PEM-Fuel Cell
shoot-through
state space averaging model
Using dynamic model of PEM-Fuel Cell supplying the load by the Z-source inverter with a novel control strategy
Article
ORIGINAL
Int jnl research engineering applied sciences-2014-2(2)-54.pdf
Int jnl research engineering applied sciences-2014-2(2)-54.pdf
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2020-09-08 16:12:52.594
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/180542020-09-08T13:35:53Zcom_10394_1865col_10394_1869
Dobzhanskyi, Oleksandr
Gouws, Rupert
11760052 - Gouws, Rupert
24881902 - Dobzhanskyi, Oleksandr
2016-07-27T06:03:23Z
2016-07-27T06:03:23Z
2016
Dobzhanskyi, O. & Gouws, R. 2016. Performance analysis of a permanent magnet transverse flux generator with double coil . IEEE transactions on magnetics, 52(1):1-11. [https://doi.org/10.1109/TMAG.2015.2472371]
0018-9464
http://hdl.handle.net/10394/18054
https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=20
https://doi.org/10.1109/TMAG.2015.2472371
One of the disadvantages of permanent magnet (PM) transverse flux machines is high magnetic flux leakage in the stator and rotor
cores. To improve the magnetic circuit of this class of machines, a generator with double coil was designed and built to research
the problem. The machine topology is different from the topologies previously introduced in the literature. The main difference was
in the stator and rotor configurations. The stator of the generator is divided by two parts: 1) outer and 2) inner. Two coils were
placed in the inner and outer stators. The rotor with PMs was placed between the two stators. To diminish magnetic flux leakage
in the stator and to decrease machine’s weight, magnetic poles were placed in aluminum housings. This resulted in high-density
eddy currents induced in the housings, and a significant raise of the temperature. The housing of the machine was modified.
The prototype test showed that the modified version of the stator contributed to a significant decrease in temperature.
Electromechanical parameters and cogging torque of the proposed generator is also studied and presented in this paper
en
IEEE
Cogging torque
eddy currents
flux leakage
transverse flux generator
Performance analysis of a permanent magnet transverse flux generator with double coil
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18054/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18054
oai:v-des-dev-lnx1:10394/18054
2020-09-08 15:35:53.198
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/93622020-09-07T12:56:46Zcom_10394_1865col_10394_1869
Du Rand, C.P.
Van Schoor, G.
11790199 - Du Rand, Carel Petrus
12134457 - Van Schoor, George
2013-10-24T10:55:29Z
2013-10-24T10:55:29Z
2012
Du Rand, C.P. & Van Schoor, G. 2012. Fault diagnosis of generation IV nuclear HTGR components. Part 1. The error enthalpy-entropy graph approach. Annals of nuclear energy, 40:14-24. [https://doi.org/10.1016/j.anucene.2011.09.013]
0306-4549
1873-2100 (Online)
http://hdl.handle.net/10394/9362
https://www.sciencedirect.com/science/article/pii/S030645491100380X
https://doi.org/10.1016/j.anucene.2011.09.013
Fault diagnosis (FD) is an important element in modern nuclear power plant (NPP) diagnostic systems. In this respect, FD of generation II and III water-cooled nuclear energy systems has become an active research topic to continually improve levels of reliability, safety, and operation. However, evolutionary advances in reactor and component technology together with different energy conversion methodologies support the investigation of alternative approaches to FD. Within this context, the basic aim of this two part series is to adopt the application of the enthalpy–entropy (h–s) graph approach for FD of generation IV nuclear high temperature gas-cooled reactor (HTGR) components. In Part I, the error method is utilized to derive fault patterns from the h–s graph in order to classify malfunctions via the fault classification index (FCI) in the nuclear reactor, turbo-machinery (gas turbine and compressors), heat exchangers (pre-cooler, intercooler, and recuperator) and the primary transporting medium of the working fluid. The study is conducted on a 165 MW model of the main power system (MPS) of the Pebble Bed Modular Reactor (PBMR) that is based on a single-shaft, closed-loop, direct Brayton thermodynamic cycle. Illustrative signatures that correspond to 24 single fault transients, categorized in three fault classes by means of a sensitivity analysis of a simplified HTGR, are presented. FD is demonstrated for steady state operation as well as load following of the MPS during normal power operation of the plant. In Part II of the series, a second classifier named the area error method is devised for NPP supervision to ultimately address the FD problem using a multiple classifier system. The application of the proposed h–s graph approach (both methods) is specifically illustrated for classification of an emulated fault transient in data from the real prototype Pebble Bed Micro Model (PBMM) plant.
en
Elsevier
Enthalpy-entropy (h-s)
fault diagnosis
nuclear
Pebble Bed Modular Reactor (PBMR)
High Temperature Gas-Cooled Reactor (HTGR)
Fault diagnosis of generation IV nuclear HTGR components. Part 1. The error enthalpy-entropy graph approach
Article
10394/9362
oai:v-des-dev-lnx1:10394/9362
2020-09-07 14:56:46.034
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/330942019-08-02T14:06:17Zcom_10394_1865col_10394_1869
Hattingh, Teresa
629b95cc-88a5-4a0a-a243-93bfe9f055f1
600
Direito, Ines
31da14ee-f8e5-4e4e-b872-83529f2eb058
600
Polmear, Madeline
2d80afe9-0935-4396-8199-88e18b2d70fd
600
Jensen, Karin
2c013b9d-7a4c-4730-93ad-b486adf54389
600
Klassen, Mike
c7e4f255-0852-432e-9b78-7c1e09fed4c0
600
29779235 - Hattingh, Teresa
2019-08-02T14:03:28Z
2019-08-02T14:03:28Z
2019
Hattingh, T. et al. 2019. Editor's page. Journal of engineering education, 108(2):143-144. [ https://doi.org/10.1002/jee.20257]
1069-4730
2168-9830 (Online)
http://hdl.handle.net/10394/33094
https://onlinelibrary.wiley.com/doi/full/10.1002/jee.20257
https://doi.org/10.1002/jee.20257
en
Wiley
Editor's page
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/33094
oai:v-des-dev-lnx1:10394/33094
2019-08-02 16:06:17.859
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/189982020-11-04T11:43:20Zcom_10394_1865col_10394_1869
Fosso-Kankeu, Elvis
Mulaba-Bafubiandi, Antoine F.
Piater, Lizelle A.
Matsobane, G. Tlou
24838616 - Fosso-Kankeu, Elvis
2016-10-11T07:48:24Z
2016-10-11T07:48:24Z
2016
Fosso-Kankeu, E. et al. 2016. Cloning of the cnr operon into a strain of Bacillaceae bacterium for the development of a suitable biosorbent. World journal of microbiology and biotechnology, 32(7): art. #114. [https://doi.org/10.1007/s11274-016-2069-5]
0959-3993
1573-0972 (Online)
http://hdl.handle.net/10394/18998
https://link.springer.com/article/10.1007/s11274-016-2069-5
https://doi.org/10.1007/s11274-016-2069-5
In this study, a potential microbial biosorbent
was engineered to improve its capacity to remediate heavy
metal contaminated water resources. A Bacillaceae bacterium
isolated from a mining area was transformed with a
plasmid carrying the (pECD312)-based cnr operon that
encodes nickel and cobalt resistance. The bioadsorption
ability of the transformed strain was evaluated for removal
of nickel from metallurgical water relative to the wildtype
strain. Results showed that transformation improved the
adsorption capacity of the bacterium by 37 % at nickel
concentrations equivalent to 150 mg/L. Furthermore it was
possible to apply prediction modelling to study the bioadsorption
behaviour of the transformed strain. As such, this
work may be extended to the design of a nickel bioremediation
plant utilising the newly developed Bacillaceae
bacterium as a biosorbent
en
Springer
Bacillaceae bacterium
adsorption behaviour
bioremediation
mining water
nickel
transformation
Cloning of the cnr operon into a strain of Bacillaceae bacterium for the development of a suitable biosorbent
Article
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18998
oai:v-des-dev-lnx1:10394/18998
2020-11-04 13:43:20.529
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/189902016-10-11T06:14:51Zcom_10394_1865col_10394_1869
Dalmora, A.C.
d582ce36-caf3-4b14-820f-90fb4cf094f3
600
Waanders, F.B.
a6e30a9a-f9aa-4d3c-acad-de50400935da
600
Silva, L.F.O.
21200d21-41a0-4e8c-b65e-b700c7f2fa2d
600
10059571 - Waanders, Frans Boudewijn
2016-10-10T12:48:13Z
2016-10-10T12:48:13Z
2015
Dalmora, A.C. et al. 2015. Detailed characteristics of coal ash from the largest coal-fired power plant in South America. 32nd Annual IPCC, 5-8 Oct. [http://tinyurl.com/hbensn7]
http://hdl.handle.net/10394/18990
http://tinyurl.com/hbensn7
en
Swanson School of Engineering, Univ of Pittsburgh
Detailed characteristics of coal ash from the largest coal-fired power plant in South America
Presentation
LICENSE
license.txt
license.txt
text/plain
1649
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89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18990
oai:v-des-dev-lnx1:10394/18990
2016-10-11 08:14:51.279
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/180572020-09-08T12:52:54Zcom_10394_1865col_10394_1869
Pelser, Wiehan A.
Gouws, Rupert
11760052 - Gouws, Rupert
22704515 - Pelser, Wiehan A.
2016-07-27T07:10:49Z
2016-07-27T07:10:49Z
2015
Pelser, W.A. & Gouws, R. 2015. Intelligente beheer van ’n hernubare, energiedoeltreffende tenk vir melkboerderye. South African journal of science and technology, 34:1344. [ http://dx.doi.org/10.4102/satnt.v34i1.1334]
0254-3486
2222-4173 (Online)
http://hdl.handle.net/10394/18057
http://dx.doi.org/10.4102/satnt.v34i1.1334
http://www.satnt.ac.za/index.php/satnt/article/viewPDFInterstitial/1334/2884
To reduce strain on Eskom and decrease the cost for producing dairy products, an energy-efficient
bulk storage tank using solar power was designed. The system uses thermoelectric cooling
modules as a supporting cooling mechanism to the traditional bulk tank cooling methods, and
is intelligently controlled by a programmable logic controller
en
AOSIS
Intelligente beheer van ’n hernubare, energiedoeltreffende tenk vir melkboerderye
Intelligent control of a renewable, energy-efficient bulk storage tank for dairy farms
Article
ORIGINAL
SA Jnl Science Tech-2015-34-Pelser.pdf
SA Jnl Science Tech-2015-34-Pelser.pdf
application/pdf
206454
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18057/1/SA%20Jnl%20Science%20Tech-2015-34-Pelser.pdf
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license.txt
license.txt
text/plain
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89636ac25b119fc1c2d7e16dd1c31e1c
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TEXT
SA Jnl Science Tech-2015-34-Pelser.pdf.txt
SA Jnl Science Tech-2015-34-Pelser.pdf.txt
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7b7576456c8e9848d57f94c6562f6cc7
MD5
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10394/18057
oai:v-des-dev-lnx1:10394/18057
2020-09-08 14:52:54.488
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/160232020-09-18T09:27:22Zcom_10394_1865col_10394_1869
Odeh, A.
Neomagus, H.W.J.P.
Osifo, P.
12767107 - Neomagus, Hendrik Willem Johannes P.
2016-01-25T12:54:36Z
2016-01-25T12:54:36Z
2013
Odeh, A.O. et al. 2013. A comparative study of the processing scheme of chitosan and Nafion 117 in membrane electrode assembly. Petroleum science and technology, 31(2):121-128. [https://doi.org/10.1080/10916466.2010.533141]
1091-6466
1532-2459 (Online)
http://hdl.handle.net/10394/16023
https://www.tandfonline.com/doi/abs/10.1080/10916466.2010.533141
https://doi.org/10.1080/10916466.2010.533141
The authors considered two fabrication techniques in the fabrication of the membrane electrode
assembly. It was observed that catalytic deposition through electro-spraying was not successful for
chitosan and Nafion 117 membranes. Chitosan membranes are highly crystalline in their dry form and
as a result the sprayed Pt/C and PtRu/C catalytic layers became detached from the membrane surface
when immersed in a mixture of water and methanol. This was not the case when both membranes
were subjected to hot-pressing as both catalytic layers were successfully transferred onto the surfaces
of chitosan and Nafion 117 membranes. For chitosan membranes, the catalysts adhered onto the
membrane both in its dry form and when hydrated in distilled water
en
Taylor & Francis
Catalyst layer
chitosan
electro-spraying
hot-pressing
membrane
membrane electrode assembly
A comparative study of the processing scheme of chitosan and Nafion 117 in membrane electrode assembly
Article
10394/16023
oai:v-des-dev-lnx1:10394/16023
2020-09-18 11:27:22.217
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/189882016-10-11T06:19:52Zcom_10394_1865col_10394_1869
Civeira, M.S.
4cfc2804-dc2f-4f19-9033-63e9d4fd76e6
600
Waanders, F.B.
a6e30a9a-f9aa-4d3c-acad-de50400935da
600
Saikia, B.K.
9c86d4ff-066d-4cc7-b50d-3ac58a9888c3
600
Silva, L.F.O.
21200d21-41a0-4e8c-b65e-b700c7f2fa2d
600
10059571 - Waanders, Frans Boudewijn
2016-10-10T12:30:02Z
2016-10-10T12:30:02Z
2015
Civeira, M.S. et al. 2015. Coal science de-sulfurization of some brazilian power-coals by low energy ultrasonication. 32nd Annual IPCC, 5-8 Oct. [http://tinyurl.com/hbensn7]
http://hdl.handle.net/10394/18988
http://tinyurl.com/hbensn7
en
Swanson School of Engineering, Univ of Pittsburgh
Coal science de-sulfurization of some brazilian power-coals by low energy ultrasonication
Presentation
LICENSE
license.txt
license.txt
text/plain
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10394/18988
oai:v-des-dev-lnx1:10394/18988
2016-10-11 08:19:52.864
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/170852020-09-15T12:39:37Zcom_10394_1865col_10394_1869
Cilliers, A.C.
Nicholls, D.
Helberg, A.S.J.
11858176 - Cilliers, Anthonie Christoffel
12363626 - Helberg, Albertus Stephanus Jacobus
2016-04-29T08:12:34Z
2016-04-29T08:12:34Z
2011
Cilliers, A.C. et al. 2011. Fault detection and characterisation in pressurised water reactors using real-time simulations. Annals of nuclear energy, 38:1196-1205. [https://doi.org/10.1016/j.anucene.2010.11.025]
0306-4549
1873-2100 (Online)
http://hdl.handle.net/10394/17085
https://www.sciencedirect.com/science/article/pii/S0306454910004251
https://doi.org/10.1016/j.anucene.2010.11.025
The use of real-time plant simulators running in parallel with a nuclear plant to predict the control system
behaviour and highlighting unexpected plant behaviour is presented. The study is performed on a
910 MW Generation II Framatome Pressurised Water Reactor model and simulator. By simulating the
plant behaviour in real-time whilst comparing it with the real-time transient the plant is following, a
complete second set of expected control operations and simulated plant measurements is generated. This
enables the calculation of the unknown set of variables introduced into the plant as a fault condition. The
benefit of such a system is that plant faults that are too small to detect (especially during transients when
the plant operating point is moving around) can be identified as unexpected or faulty plant behaviour.
The behaviour of the control system is also continually predicted so the effect of the control system compensating
for fault symptoms (which in most cases hides the fault condition) is used to characterise the
fault as a control variable acting on the plant. The approach is illustrated by simulating a specific fault,
small enough to go undetected for an extended period of time, during a typical transient. This is continually
compared with a plant simulation, simulating the same transient without the fault. Using the
described methodology, the fault is detected and characterised long before the plant safety is jeopardised
or the fault is detected by the conventional protection system.
en
Elsevier
Control and instrumentation
Simulator
Online monitoring
Pressurised Water Reactor
Fault detection
Fault characterisation
Fault detection and characterisation in pressurised water reactors using real-time simulations
Article
10394/17085
oai:v-des-dev-lnx1:10394/17085
2020-09-15 14:39:37.939
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/99672016-09-29T07:23:32Zcom_10394_1865col_10394_1869
Carrier, Marion
489033db-1685-4779-bcb5-6122318f8f59
Knoetze, Johannes
5f8b3493-c12b-4d2a-8669-6f9eb8a22a39
Neomagus, Hendrik Willem Johannes P.
3773f996-ad99-451e-9e51-becca4147043
Görgens, Johann
3f623950-e9e8-4da0-b291-60651cbba179
2014-01-20T12:38:43Z
2014-01-20T12:38:43Z
2012
Carrier, M. et al. 2012. Influence of chemical pretreatment on the internal structure and reactivity of Pyrolysis chars produced from sugar cane bagasse. Energy & fuels, 26(7):4497-4506. [http://pubs.acs.org/journal/enfuem]
0887-0624
1520-5029
http://hdl.handle.net/10394/9967
http://dx.doi.org/10.1021/ef300500k
http://pubs.acs.org/doi/pdf/10.1021/ef300500k
The characterization of char obtained from the vacuum pyrolysis (8 kPaabs, 460 °C, 18 °C/min) of sugar cane bagasse followed by steam gasification (60 wt % of steam, 700−900 °C) was studied. The influence of different chemical pretreatments prior to pyrolysis (acetone, ethanol, HNO3 and HF) on the ash content, the pore structure, and chemical composition of resulting chars and activated carbons were investigated. Changes in the pore structure were observed during the pyrolysis process and the steam gasification, namely, the development of a channel network and the increase of meso- and macroporosity distributions, respectively. These porous changes affect the pyrolytic yields. Clear influences of the surface area and ash content on the pyrolytic water yields and the inorganic devolatilization effect on the meso- and macropore distributions of chars were shown. Furthermore, the structural reorganization of chars obtained during the vacuum pyrolysis of HF and solvent-leached bagasse was beneficial to their reactivity toward steam gasification.
en
American Chemical Society
Industrial compressed air
solar power
energy efficiency
emissions impact
Influence of chemical pretreatment on the internal structure and reactivity of Pyrolysis chars produced from sugar cane bagasse
Article
10394/9967
oai:v-des-dev-lnx1:10394/9967
2016-09-29 09:23:32.262
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/181272020-09-08T14:03:06Zcom_10394_1865col_10394_1869
Gouws, R.
Swanepoel, M.
11760052 - Gouws, Rupert
2016-08-02T11:53:08Z
2016-08-02T11:53:08Z
2012
Gouws, R. & Swanepoel, M. 2012. Source stabilization of a single-phase induction motor pump configuration for a swimming pool in South Africa. Proceedings of the 20th Domestic Use of Energy Conference (DUE): 3-8, 3-4 Apr, Cape Town, South Africa. [https://ieeexplore.ieee.org/document/6198205]
978-1-4673-1232-5
http://hdl.handle.net/10394/18127
https://ieeexplore.ieee.org/document/6198205
In this paper the authors investigate the effect of source stabilization on the energy consumption and harmonic distortion of a single-phase induction motor pump configuration for a swimming pool in South Africa. The design of the source stabilization system together with the power dissipation at different cut-off frequencies is provided. Results on the energy consumption and harmonic distortion for the following two scenarios are provided: 1) normal operating condition and 2) improved operating condition (where the source stabilization system has been activated)
en
IEEE
Source stabilization of a single-phase induction motor pump configuration for a swimming pool in South Africa
Presentation
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/18127/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/18127
oai:v-des-dev-lnx1:10394/18127
2020-09-08 16:03:06.258
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
oai:repository.nwu.ac.za:10394/108262016-04-28T09:35:21Zcom_10394_1865col_10394_1869
Huyssen, R.J.
86280c2f-0436-49de-8f9f-a49316ca527c
-1
Spedding, G.R.
0fadeaed-37c5-4a00-9f47-7919644c61fd
-1
Mathews, E.H.
9febf8a3-fb0b-4ebf-8dbe-b6830b04c421
-1
Liebenberg, L.
c9e26126-b9ea-4e85-85bd-27385e53c216
-1
2014-07-08T13:30:23Z
2014-07-08T13:30:23Z
2012
Huyssen, R.J. et al. 2012. Wing-body circulation control by means of a fuselage trailing edge. Journal of aircraft, 49(5):1279-1289. [http://arc.aiaa.org/loi/ja ]
2090-1232
http://hdl.handle.net/10394/10826
Ideal flight sheds the least amount of kinetic energy into a wake while imparting momentum sufficient to balance the vehicle weight. This combination defines a unique downwash distribution for the wake, which an aircraft designer should provide for. A central fuselage, as required for the typical flicht objective, presents an obstacle to this intent. A wing interrupted by a prominent fuselage is expected to shed inboard trailing vortices with central upwash harmful to the span efficiency of the aircraft. It is proposed here that a trailing edge on the fuselage can be used to control the circulation in the central region of the aircraft so that the central downwash deficiency can be avoided. Such a Kutta edge can further be applied as part of a high-o8ft system to increase cehtrao d9ownwashy by ihncreasi8ng the loading on the wing root and lift over the fuselage itself. Time-averaged flowfields behind a wing-body combination with and without a Kutta edge have been measured in wind-tunnel experiments. The results show that an edged aft-body does influence central circulation, as predicted. Flight with ideal wakes may be more readily attained than hitherto realized.
http://dx.doi.org/10.2514/1.C031543
http://arc.aiaa.org/doi/abs/10.2514/1.C031543
en
American Institute of Aeronautics & Astronatics
Wing-body circulation control by means of a fuselage trailing edge
Article
10394/10826
oai:v-des-dev-lnx1:10394/10826
2016-04-28 11:35:21.767
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
oai:repository.nwu.ac.za:10394/212352017-04-10T06:05:47Zcom_10394_1865col_10394_1869
Musyoka, Nicholas
af7d15e0-c221-4c96-ac8f-e31776c19a08
600
Bessarabov, Dmitri
dd89c594-d2ce-41c9-b2e8-ff373779e4ec
600
Ren, Jianwei
f75edfa6-60be-46a6-8c58-817a84d84243
600
Annamalai, Perushini
6d7af176-1c90-4368-9163-cf48da4875a9
600
Langmi, Henrietta W.
0b6c579a-e106-45a5-b802-86edf910ba2a
600
22730389 - Bessarabov, Dmitri Georgievich
2017-04-07T12:49:38Z
2017-04-07T12:49:38Z
2016
Musyoka, N.M. et al. 2016. Synthesis of a hybrid MIL-101(Cr)/ZTC composite for hydrogen storage applications. Research on chemical intermediates, 42(6):5299-5307. [http://link.springer.com/journal/11164]
0922-6168
1568-5675 (Online)
http://hdl.handle.net/10394/21235
http://dx.doi.org/10.1007/s11164-015-2361-2
http://link.springer.com/article/10.1007/s11164-015-2361-2
Metal–organic frameworks (MOFs) hybrid composites have recently attracted considerable attention in hydrogen storage applications. In this study a hybrid composite of zeolite templated carbon (ZTC) and Cr-based MOF (MIL-101) was synthesised by adding the templated carbon in situ during the synthesis of MIL-101(Cr). The obtained sample was fully characterized and hydrogen adsorption measurements performed at 77 K up to 1 bar. The results showed that the surface areas and the hydrogen uptake capacities of individual MIL-101 (2552 m2 g−1, 1.91 wt%) and zeolite templated carbon (2577 m2 g−1, 2.39 wt%) could be enhanced when a hybrid MIL-101(Cr)/ZTC composite (2957 m2 g−1, 2.55 wt%) was synthesized. The procedure presents a simple way for enhancement of hydrogen uptake capacity of the individual Cr-MOF and templated carbon samples
en
Springer
Metal organic framework (MOF)
Zeolite templated carbon (ZTC)
Hybrid MIL-101(Cr)/ZTC
Hydrogen uptake
Surface area
Synthesis of a hybrid MIL-101(Cr)/ZTC composite for hydrogen storage applications
Article
LICENSE
license.txt
license.txt
text/plain
1649
https://v-des-dev-lnx1.nwu.ac.za/bitstream/10394/21235/1/license.txt
89636ac25b119fc1c2d7e16dd1c31e1c
MD5
1
10394/21235
oai:v-des-dev-lnx1:10394/21235
2017-04-10 08:05:47.364
Institutional Repository Development | North-West University | NWU
Lizwi.Njani@nwu.ac.za
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
xoai///col_10394_1869/100