Now showing items 263-282 of 1122

    • The development process of an axial active magnetic bearing 

      Gouws, R.; Van Schoor, G. (2005)
      The purpose of this paper is to motivate and inspire students to investigate and understand fundamental principles of electrical engineering such as magnetic levitation, control theory and sensor design. This paper describes ...
    • DFT + U studies of the electronic and optical properties of ReS2 mono-layer doped with lanthanide atoms 

      Obodo, Kingsley Onyebuchi; Ouma, Cecil N.M.; Gebreyesus, Grebremedh; Obodo, Joshua T.; Ezeonu, Stella O. (IOP Publishing, 2019)
      The structural, electronic and optical properties of various elements in the lanthanide series as dopant atoms in the triclinic mono-layered rhenium disulphide (ReS2) structure was evaluated using density functional theory ...
    • DFT plus U studies of the electronic and optical properties of ReS2 mono-layer doped with lanthanide atoms 

      Obodo, Kingsley Onyebuchi; Ouma, Cecil N.M.; Gebreyesus, Grebremedh; Obodo, Joshua T.; Ezeonu, Stella O. (IOP, 2019)
      The structural, electronic and optical properties of various elements in the lanthanide series as dopant atoms in the triclinic mono-layered rhenium disulphide (ReS2) structure was evaluated using density functional theory ...
    • Die ontwikkeling van ’n superkapasitoraangedrewe voertuig vir die mynboubedryf 

      Bisschoff, W.A.; Gouws, R. (AOSIS, 2014)
      The mining industry is currently looking to implement electrical vehicles into the underground tunnels of mines to reduce the amount of carbon pollution in these tunnels. This electrical vehicle is driven by an ultracapacitor ...
    • Different techniques for reducing DLOFC fuel temperatures in a PBMR-DPP-400 core 

      Tchonang Pokaha, Marius; Serfontein, Dawid E. (Elsevier, 2018)
      This article addresses the topic of modifying the fuel cycles of Pebble Bed Reactors in order to reduce their maximum fuel temperatures during Depressurised Loss of Forced Coolant (DLOFC) accidents, in order to prevent ...
    • Direct liquefaction of 2 South African bituminous coal fines and their beneficiated float fractions 

      Uwaoma, R.C.; Strydom, C.A.; Matjie, R.H.; Bunt, J.R. (EARET, 2018)
      The direct liquefaction of South African coal fines and their density separated (float) fractions were carried out under moderate conditions in a laboratory autoclave. The liquefaction temperature ranged between 380 and ...
    • Direct metal laser sintering, using conformal cooling, for high volume production tooling 

      Van As, B.; De Beer, D.J.; Combrinck, J.; Booysen, G.J. (Univ Stellenbosch, 2017)
      Existing techniques to manufacture conventional tool steel inserts for the plastic injection moulding process are expensive and time-consuming. Complex mould inserts, difficult to manufacture with conventional processes, ...
    • A Discourse Model of Affect for Text-to-Speech Synthesis 

      Schlunz, Georg I.; Barnard, Etienne (Pattern Recognition Association of South Africa and Mechatronics International Conference, 2013)
      This paper introduces a model of affect to improve prosody in text-to-speech synthesis. It operates on the discourse level of text to predict the underlying linguistic factors that contribute towards emotional appraisal, ...
    • A discriminative approach to harmonic emission assessment 

      Peterson, Brandon; Rens, Johan; Botha, Gerhard; Desmet, Jan (IEEE, 2015)
      With the onset of renewable power sources onto the network, such as Photovoltaic power plants contributing to Total Harmonic Distortion (THD) in voltage, a methodology to quantify their contribution to the THD in voltage ...
    • Dispersion of inorganic contaminants in surface water in the vicinity of Potchefstroom 

      Manyatshe, A.; Fosso-Kankeu, E.; Van der Berg, D.; Lemmer, N.; Waanders, F. (Elsevier, 2017)
      Potchefstroom and the neighbouring cities rely mostly on the Mooi River and Vaal River for their water needs. These rivers flow through the gold mining areas and farms, and are therefore likely to be contaminated with ...
    • Dissolution kinetics of sorbents and effect of additives in wet flue gas desulfurization 

      Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (De Gruyter, 2014)
      Flue gas desulfurization (FGD) technology has been adopted by a number of power stations for the removal of sulfur dioxide (SO2) from flue gas. The wet FGD system is the most commonly used process because of high SO2 removal ...
    • Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution 

      Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (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 

      Davel, Marelie H.; Theunissen, Marthinus W.; Pretorius, Arnold M.; Barnard, Etienne (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? 

      De Beer, J.C.; Liebenberg, L. (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 

      Van Rensburg, M.J.; Le Roux, M.; Campbell, Q.P. (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 

      Le Roux, M.; Campbell, Q.P.; Van Rensburg, M.J. (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 

      Raphoolo, Ikaneng Victor; De Kock, Jan A. (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 

      Peach, P.; Bredenkamp, J.I.G.; Van Rensburg, J.F. (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 

      Hattingh, Teresa; Direito, Ines; Polmear, Madeline; Jensen, Karin; Klassen, Mike (Wiley, 2019)
    • Effect of 3d transition metal substitutional dopants and adatoms on mono layer TcS2 ab initio insights 

      Ouma, Cecil N.M.; Obodo, Kingsley O.; Parlak, Cemal; Amolo, George O. (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 ...