Browsing Faculty of Engineering by Title
Now showing items 274-293 of 1122
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Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution
(Association of the Chemical Engineers of Serbia AChE, 2015)Wet flue gas desulphurization (FGD) is a crucial technology which can be used to abate the emission of sulphur dioxide in coal power plants. The dissolution of coal fly ash in adipic acid is investigated by varying acid ... -
DNNs as layers of cooperating classifiers
(AAAI Press, 2020-01)A robust theoretical framework that can describe and predict the generalization ability of deep neural networks (DNNs) in general circumstances remains elusive. Classical attempts have produced complexity metrics that rely ... -
Does cancer risk increase with HbA1c, independent of diabetes?
(Cancer Research UK, 2014)Background: The risks for several cancer types are increased in people with diabetes. Hyperglycaemia, hyperinsulinaemia, inflammation and altered hormonal concentrations are common characteristics between the two diseases ... -
Drying of coal fines assisted by ceramic sorbents
(Springer, 2016)It is proposed to introduce contact sorption drying as a method to reduce the moisture content in coal fines. The aim of this study was to investigate the possibility of drying fine and ultra-fine coal using porous ceramic ... -
Drying of fine coal using air in a fluidized bed
(IMPC, 2014)Fluidised bed drying is currently receiving much attention as a dewatering option during the beneficiation of fine (defined here as between 1 mm and 2 mm particles) coal. Apart from concerns about safety and combustion, ... -
Dynamic load-shedding for enhancement of power system stability for the Lesotho 132 kV transmission network
(IEEE, 2019)The transient and dynamic stability are key elements that a system should satisfy to achieve stable system operation [1]. Fault type and location determine the impact that each fault puts on the system and whether power ... -
Dynamic optimisation of deep-level mine refrigeration control
(Stellenbosch Univ, 2018)Artificial cooling remains vital to the deep-level mining industry. This is mainly to ensure a safe underground working environment. Unfortunately, the refrigeration systems of South African gold mines are outdated. ... -
Editor's page
(Wiley, 2019) -
Effect of 3d transition metal substitutional dopants and adatoms on mono layer TcS2 ab initio insights
(Elsevier, 2020)Within the spin polarized density functional theory formalism, the properties (structural, magnetic, electronic and optical) of transition metal (TM) substitutional doping as well as adsorption on monolayer TcS2 has been ... -
The effect of a reduced power quality on the energy efficiency of stand-alone generator systems
(IEEE, 2016)It has already been thoroughly validated that the efficiency of direct online motors is susceptible towards certain power quality parameters such as voltage unbalance or harmonic voltage distortion. It can be assumed that ... -
The effect of acid demineralising bituminous coals and de-ashing the respective chars on nitrogen functional forms
(Elsevier, 2017)An opportunity presented itself to compare changes in nitrogen functional forms brought by the acid treatment of South African bituminous coals and their respective chars. X-ray photoelectron spectroscopy (XPS) was used ... -
The effect of acid washing on the pyrolysis products derived from a vitrinite-rich bituminous coal
(Elsevier, 2015)Extensive characterization of the pyrolysis products, derived from raw and acid washed samples of a vitrinite-rich South African bituminous coal is reported. Pyrolysis experiments were carried out with use of a modified ... -
The effect of added minerals on the pyrolysis products derived from a vitrinite-rich demineralised South African coal
(Elsevier, 2016)A better understanding of the behaviour of the inorganic matter present in coal will assist in more cost-effective operations and more consistency in product yield and composition during thermal processing. In this study, ... -
The effect of aqueous phase recirculation during hydrothermal liquefaction of spent coffee grounds
(EARET, 2018)Batch hydrothermal liquefaction of spent coffee grounds was done in this study. The effect of subsequent diluted aqueous phase recirculation was studied at a constant temperature of 275 °C and residence time of 10 ... -
Effect of biomass feedstock composition on biochar properties produced through hydrothermal liquefaction
(EARET, 2018)The effect that 6 different biomass feedstocks have on biochar was investigated. The biochar was produced through hydrothermal liquefaction at temperatures of 260˚C and 300˚C. The effect of temperature was also investigated. ... -
The effect of carbon dioxide partial pressure on the gasification rate and pore development of Highveld coal chars at elevated pressures
(Elsevier, 2018)Char structural changes occurring during gasification are normally only related to conversion and few data is published on the effect of carbon dioxide partial pressure on the extent of pore development. In this study, the ... -
The effect of carbonaceous reductant selection on chromite pre-reduction
(Springer, 2017)Ferrochrome (FeCr) production is an energy-intensive process. Currently, the pelletized chromite pre-reduction process, also referred to as solid-state reduction of chromite, is most likely the FeCr production process ... -
Effect of dipole corrections and spin orbit coupling on tungsten dichalcogenides monolayer: a in silico first principles study
(IEEE, 2018)The structural and electronic properties of tungsten dichalogenides compounds (WS 2 , WSe 2 , WTe 2 ) were investigated from first principles calculations. We found that the structural and electronic properties changed ... -
Effect of fine coal tailing porosity on the mobility and speciation of heavy metals in the leachates
(EARET, 2018)The effect of porosity of coal tailings on the mobilization and speciation of heavy metals is important for the implementation of management strategies. In this study, column leaching experiments were carried out to ... -
Effect of fly ash as an additive on the limestone dissolution rate constant
(American Chemical Society, 2015)Limestone dissolution is a very important factor in flue gas desulfurization systems because it determines its reactivity toward SO2. Fly ash, a siliceous material, has been reported to improve sorbent reactivity. This ...