Browsing Faculty of Engineering by Title
Now showing items 283-302 of 1129
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(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 ... -
Effect of H2S on SO2-depolarised water electrolysis
(Elsevier, 2015)The performance of a PEM SO2 electrolyser, used for the production of H2 gas and liquid H2SO4, was evaluated when the feed was contaminated with hydrogen sulfide. Transient voltage response at constant current density and ... -
Effect of high frequency power supplies on the electrostatic precipitator collection efficiency as compared to conventional transformer rectifiers
(Research India Publications, 2018)Particulate emission is a major problem in industrial processes, caused mainly by power plants that make use of coal as a primary source of energy. Stringent emissions limits, set by government organisations requires ... -
The effect of language identification accuracy on speech recognition accuracy of proper names
(Pattern Recognition Association of South Africa and Mechatronics International Conference, 2017)Utilising the known language of origin of a name can be useful when predicting the pronunciation of the name. When this language is not known, automatic language identification (LID) can be used to influence which ... -
The effect of molar ratio and flow velocity on the surface area required for pertraction of a Zr/Hf mixture
(IOP, 2019)Zirconium (Zr) and hafnium (Hf) need to be separated before being used in nuclear applications. Equilibria data have shown that Hf can be selectively extracted over Zr from a sulphate medium using organophosphorus ... -
Effect of operating parameters on hydrothermal liquefaction of sugarcane bagasse
(EARET, 2018)Hydrothermal liquefaction (HTL) is a thermochemical process that produces various products from lignocellulosic feedstocks. In this study sugar cane bagasse was used as feedstock for HTL. Experiments were carried out ... -
The effect of particle size on the rate and depth of moisture evaporation from coal stockpiles
(SAIMM, 2016)Excessive amounts of moisture in product coal can influence the efficiency of downstream utilization processes due to a decreased calorific value and handling problems. Stockpiles can be used to decrease the moisture content ... -
Effect of reactor vessel cooling insulation and reflector heat pipes on the temperatures of a pebble-bed reactor using a system CFD approach
(Elsevier, 2020)This study investigates firstly, the effects of varying insulation thickness and flow path width between the core barrel and RCCS-concrete pressure vessel of an upward-flow helium-cooled pebble bed HTGR. The effects on ...
