Browsing Faculty of Engineering by Title
Now showing items 1077-1096 of 1129
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Ultrasonic assisted amaranth stem pretreatment for bio-ethanol production
(ETA-Florence Renewable Energies, 2015)An investigation was undertaken to determine the effect of ultrasound on enzymatic hydrolysis rate and enhanced bioethanol yields. Compositional analysis of the feedstock reveals that amaranth lignocellulose contains 36.35% ... -
Ultrasonic assisted biodiesel production
(ETA-Florence Renewable Energies, 2014)One of the biggest hurdles in the production of biodiesel is the high production cost compared to petroleum-derived diesel. Even though the mechanical agitation utilised during biodiesel production is effective, it is ... -
An understanding of lump coal physical property behaviour (density and particle size effects) impacting on a commercial-scale Sasol-Lurgi FBDB gasifier
(Elsevier, 2008)Thermal processes which utilize coarse coal, such as fixed-bed gasification and chain grate stoker boilers, are dependant on a stable particle size for stable operation. During coarse coal utilization, thermal fragmentation ... -
An understanding of the behaviour of a number of element phases impacting on a commercial-scale Sasol-Lurgi FBDB gasifier
(Elsevier, 2008)Chemical properties of coal which impact on gasification performance relate to those processes which do effect a change in chemical constitution, these in turn may lead to changes in physical properties such as particle ... -
An understanding of the porosity of residual coal/char/ash samples from an air-blown packed bed reactor operating on inertinite-rich lump coal
(Elsevier, 2012)The thermal treatment of coal causes a development of internal porosity of the resultant char due to the changes in the coal char pores, i.e. the opening of original closed pores, the formation of new pores, and an ... -
Unsupervised acoustic model training: comparing South African English and isiZulu
(IEEE, 2015)Large amounts of untranscribed audio data are generated every day. These audio resources can be used to develop robust acoustic models that can be used in a variety of speech-based systems. Manually transcribing this ... -
Unsupervised Fine-tuning of Speaker Diarisation Pipelines using Silhouette Coefficients
(SACAIR, 2021)We investigate the use of silhouette coefficients in cluster analysis for speaker diarisation, with the dual purpose of unsupervised fine-tuning during domain adaptation and determining the number of speakers in an audio ... -
Up-flow vs downflow anaerobic digester reactor configurations for treatment of fats-oil-grease laden poultry slaughterhouse wastewater: a review
(IWA Publishing, 2020)The process of anaerobic digestion has been and still remains the most efficient, cost effective and environmentally benign treatment process for poultry slaughterhouse wastewater (PSW). The PSW is characterized by a high ... -
Update temperature control for a Claus unit with neural networks
(Gulf Publishing Company, 2013)The Natref Oil Refinery in Sasolburg, South Africa, experienced refractory problems in the combustion chamber of the Sulphur Recovery Unit (SRU) since start-up (Figure 1). Even though the SRU was at all times operated ... -
The use of Mössbauer spectroscopy in environmental research
(Springer, 2017)The impact that mining has on the environment is becoming an ever increasing problem all over the world. South Africa, Brazil and India are main producers of various valuable resources such as for example iron ore, platinum, ... -
The use of optimisation modelling for energy recovery investment decision making
(IEEE, 2019)Investment decision making is a common occurrence for any engineering company. These investments include any possibility from relative inexpensive to extremely costly equipment. When power generation turbine procurements ... -
The use of tracking technology for improved management of trade corridors
(IEEE, 2013)The sub-Sahara African economy is suffering from the inefficient management of trade corridors. Long delays experienced at weigh bridges and border posts are a big contributor towards the slow average movement of freight. ... -
The use of variable speed drives for cost–effective energy savings in South African mine cooling systems
(Elsevier, 2013)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 ... -
Using a meta-model to compensate for training-evaluation mismatches
(Southern African Conference for Artificial Intelligence Research, 2020)One of the fundamental assumptions of machine learning is that learnt models are applied to data that is identically distributed to the training data. This assumption is often not realistic: for example, data collected ... -
Using an effective viscosity to account for the effect of the walls on the pressure drop through an annular packed bed
(ASME, 2009)The question arose whether the correlation for the pressure drop prescribed for cylindrical pebble bed reactors by the Nuclear Safety Commission (KTA) of Germany could still be applied to the proposed annular configuration ... -
Using big data for insights into sustainable energy consumption in industrial and mining sectors
(Elsevier, 2018)Human activities related to the production and consumption of energy are negatively impacting the environment and need to be addressed by focusing on cleaner production. With this perspective, this study investigates ... -
Using dynamic model of PEM-Fuel Cell supplying the load by the Z-source inverter with a novel control strategy
(Staff Research Council of Yeshwantrao Chavan College of Engineering (YCCE) , Nagpur, India, 2014)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 ... -
Using information and communication technology to improve the efficiency of African border posts
(IEEE, 2015)African border posts have long been characterized by high levels of inefficiency, resulting in long cross-border delays that hamper the African economy. This partly results from the conflicting objectives of the multiplicity ... -
Using specific energy as a metric to characterise compressor system performance
(Elsevier, 2019)Mine compressed air systems are inefficient and complex to analyse. There is no clear method which can be used to characterise the total performance of the supply side system in terms of the air supplied and energy consumed. ... -
Using summary layers to probe neural network behaviour
(South African Institute of Computer Scientists and Information Technologists, 2020)No framework exists that can explain and predict the generalisation ability of deep neural networks in general circumstances. In fact, this question has not been answered for some of the least complicated of neural network ...
