Browsing Faculty of Engineering by Title
Now showing items 537-556 of 1123
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In-situ biodiesel production from sunflower seeds using liquefaction
(ETA-Florence Renewable Energies, 2015)One of the most expensive steps in the bio-diesel value chain is the extraction of oil from the seeds. Simultaneous extraction and transesterification will lower the overall capital costs of the process while enhancing ... -
In-situ CO2 capture during a UCG process by simulati ng possible CO2 absorption on roof, floor and coal mineral structures
(International Pittsburgh Coal Conference, 2017) -
Induction motor efficiency analysis: direct torque, flux control
(EE Publishers, 2012)In this study, two scenarios were evaluated: where the induction motor was controlled at a constant speed with a variable thickness slab, and where the speed of the induction motor was controlled according to the ... -
Induction motor efficiency test methods: a comparison of standards
(IEEE, 2017)Improved efficiency is the task of the hour. Environmental challenges, which include climate change, global warming and greenhouse gas emission have been fuelling the need to increase energy efficiency in electrical rotating ... -
Industrial viability of homogeneous olefin metathesis: beneficiation of linear alpha olefins with the diphenyl-substituted pyridinyl alcoholato ruthenium carbene precatalyst
(Elsevier, 2016)The catalytic performance of the diphenyl-substituted pyridinyl alcoholato ruthenium carbene precatalyst of the Grubbs 2-type was optimized for 1-octene metathesis by varying operating parameters, such as reaction temperature ... -
Industry 4.0 readiness assessment for South African industries
(Univ Stellenbosch, 2019)Technological advancements related to the fourth industrial revolution are causing disruptive changes that are widely felt at national, industry, and company level. Industry 4.0, an initiative driving the fourth industrial ... -
Industry 4.0 roll-out strategy for dynamic mine heat load management
(Stellenbosch Univ, 2019)Deep-level mining is under severe financial pressure from several unique challenges. One of these is maintaining acceptable underground temperatures for humans to work in while achieving demanding production targets. ... -
Influence of added potassium and sodium carbonates on CO2 reactivity of the char from a demineralized inertinite rich bituminous coal
(Elsevier, 2012)The addition of K2CO3, Na2CO3 and a mixture of the two catalysts showed an increase in the CO2 reactivity of the char prepared from the demineralized inertinite rich bitumious coal at 900 °C in nitrogen. The CO2 reactivity ... -
Influence of additives on the devolatilization product yield of typical South African coals, and effect on tar composition
(SAIMM, 2018)South African coal is mainly used for electricity generation by means of pulverized fuel combustion and liquid fuels production via indirect gasification technology and Fischer-Tropsch synthesis. In order to expand the ... -
The influence of bedding-plane orientation on the degradation characteristics of a South African Waterberg coal
(Taylor & Francis, 2016)A tomographic study of coal microstructure (coal bedding planes, pre-existing cracks, microlithotype boundaries, and mineral boundaries) was undertaken to explain its influence on coal degradation due to impact. A number ... -
The influence of calcium lignosulphonate addition on non-isothermal pyrolysis and gasification of demineralised bituminous coal fines
(Elsevier BV, 2022)Amorphous calcium lignosulphonate (CaLS), a by-product of the paper industry, was evaluated as an adhesive to bind demineralised bituminous coal fines in various weight percentage ratios. Sequential acid (HCl, HF, ... -
Influence of chemical pretreatment on the internal structure and reactivity of Pyrolysis chars produced from sugar cane bagasse
(American Chemical Society, 2012)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 ... -
Influence of density separation of selected South African coal fines on the products obtained during liquefaction using tetralin as a solvent
(ACS, 2019)The liquefaction of two South African discarded coal fines and their density separated (float) fractions were carried out under moderate conditions in a laboratory autoclave. Liquefaction tests were carried out on both ... -
The influence of design parameters on the occurrence of shielding in multi-electrode ESPs and its effect on performance
(Elsevier, 2018)A numerical model in which OpenFOAM® is used to model the electrostatic field resulting from corona discharge in single-channel wire-plate electrostatic precipitators (ESPs) was applied to systematically study the shielding ... -
Influence of input matrix representation on topic modelling performance
(Pattern Recognition Association of South Africa and Mechatronics International Conference, 2010)Topic models explain a collection of documents with a small set of distributions over terms. These distributions over terms define the topics. Topic models ignore the structure of documents and use a bag-of-words approach ... -
The influence of K2CO3 and KCl on H2 formation during heat treatment of an acid-treated inertinite-rich bituminous coal-char
(Springer, 2016)Thermogravimetric-mass spectrometry (TG-MS) studies were conducted in order to investigate the effect of potassium carbonate (K2CO3) and potassium chloride (KCl) on the conversion and hydrogen evolution of chars derived ... -
The influence of K2CO3 on the swelling and caking behavior of large South African coal particles
(International Pittsburgh Coal Conference, 2016) -
Influence of maceral composition on the structure, properties and behaviour of chars derived from South African coals
(Elsevier, 2015)The generation of coal chars is an important intermediate step in coal conversion processes such as combustion and gasification. The char structure impacts their behaviour in these processes. Detailed investigations on ... -
Influence of partial and complete glutamine-and glucose deprivation of breast-and cervical tumorigenic cell lines
(BioMed Central, 2015)Background: Due to their high proliferative requirements, tumorigenic cells possess altered metabolic systems whereby cells utilize higher quantities of glutamine and glucose. These altered metabolic requirements make it ... -
Influence of potassium carbonate on the swelling propensity of South African large coal particles
(ACS, 2015)The swelling propensity of some coals may restrict their use in fixed- and fluidized-bed gasification operations, and effective reduction of swelling can widen the applicability of these coals. Extensive research has been ...