Author:Nkosi, FP; Jafta, CJ; Kebede, Mesfin A; Le Roux, Lukas J; Mathe, Mahlanyane K; Ozoemena, KIDate:Mar 2015Microwave irradiation at the pre- and post-annealing steps of the synthesis of LiAl(subx)Mn(sub2-x)O(sub4) (x = 0 and 0.3) spinel cathode materials for rechargeable lithium ion battery is a useful strategy to optimize the average manganese ...Read more
Author:Jafta, CJ; Mathe, Mahlanyane K; Manyala, N; Roos, WD; Ozoemena, KIDate:Aug 2013The LiMn1.5Ni0.5O4 spinel is an important lithium ion battery cathode material that has continued to receive major research attention because of its high operating voltage (∼4.8 V). This study interrogates the impact of microwave irradiation ...Read more
Author:Mathe, Ntombizodwa R; Scriba, Manfred R; Rikhotso, Rirhandzu S; Coville, NJDate:2017Bimetallic Pt–Ni nanoparticles were synthesized for use as electrocatalysts for the methanol oxidation reaction using a cost-effective microwave-irradiation synthesis procedure that offers precise temperature control. By varying the concentration ...Read more
Author:Henshilwood, C; D'Errico, F; Vanhaeren, M; Van Niekerk, K; Jacobs, ZDate:16 Apr 2004There are two competing models for the emergence of modern human behaviour: first, a late emergence in Africa or Eurasia similar to 50 to 40 thousand years ago and second, and a gradual transition in Africa between 250 to 50 ka. The earliest ...Read more
Author:Van Heerden, AdelaiDate:Dec 2016The African life philosophy of ubuntu is about two aspects ubu and ntu, and constitutes a wholeness and oneness (Ramose, 2002).1 Modern psychology has until very recently entailed oneness with its Western ideas and approaches (Sinha, 1986).2 ...Read more
Author:Carpenter, SR; DeFries, R; Dietz, T; Mooney, HA; Polasky, S; Reid, WV; Scholes, RJDate:Oct 2006The Millennium Ecosystem Assessment (MA) was designed to meet the needs of decision-makers for scientific information on the consequences of ecosystem change for human well-being. Even though the intended audience is decision-makers, the ...Read more
Author:Milev, AM; Spottiswoode, SM; Noble, KRDate:Sep 1995Mining results in seismic activity of varying intensity, from small micro seismic events to larger seismic events, often associated with significant seismic induced damages. This work deals with the understanding of the present seismicity in ...Read more
Author:Oboirien, BO; Engelbrecht, AD; North, Brian C; Eramus, RM; Falcon, RDate:Sep 2011The mineral-char interaction can occur during the gasification of high-ash coals in fluidized-bed gasifiers when the melted minerals cover the char surface by penetrating into the cracks and pores of the char. In addition to the physical ...Read more
Author:Green, JJ; Hlophe, K; Dickens, J; Teleka, Ruth; Price, MDate:Apr 2012Underground mining robotics has not enjoyed the same technology advances as above ground mining. This paper examines sensing technologies that could enable the development of underground autonomous vehicles. Specifically, we explore a combination ...Read more
Author:Riemer, KL; Durrheim, RJDate:Jun 2012The Kaapvaal Craton in South Africa hosts one of the largest gold placer deposits in the world. Mining in the Witwatersrand Basin here has been the source of about one third to one half of the gold ever produced in the world. Gold was discovered ...Read more
Author:Schachtschneider, KDate:Mar 2012Acid mine drainage (AMD) is a serious threat to water quality in South Africa. Questions are being asked to South African government leaders as to what they are doing to mitigate the effects that South Africa’s mining industry is having on ...Read more
Author:Schulze, C; Ngcobo, Sandile; Duparre, M; Forbes, ADate:Dec 2012The modal decomposition of an arbitrary optical field may be done without regard to the spatial scale of the chosen basis functions, but this generally leads to a large number of modes in the expansion. While this may be considered as ...Read more
Author:Zhang, Y; Roux, FSDate:Jun 2014We investigate the effect of the down-conversion angle between the signal and idler beams in spontaneous parametric down-conversion on the bandwidth of the modal spectrum (Schmidt number) of the down-converted quantum state. For this purpose, ...Read more
Author:Flamm, D; Naidoo, Darryl; Schulze, C; Forbes, A; Duparré, MDate:Jul 2012A procedure for the real-time analysis of laser modes using a phase-only spatial light modulator is outlined. The procedure involves encoding into digital holograms by complex amplitude modulation a set of orthonormal basis functions into ...Read more
Author:Loveday, Philip W; Long, Craig S; Ramatlo, Dineo AMDate:Mar 2018Accurate computation of dispersion characteristics of guided waves in rails is important during the development of inspection and monitoring systems. Wavenumber versus frequency curves computed by the semi-analytical finite element method ...Read more
Author:Greben, JM; Elphinstone, E; Holloway, Jennifer PDate:Jun 2006A novel model has been developed to predict elections on the basis of early results. The electorate is clustered according to their behaviour in previous elections. Early results in the new elections can then be translated into voter behaviour ...Read more
Author:Mulovhedzi, PT; Rambuwani, GT; Bopape, MJ; Maisha, R; Monama, Nkwe ODate:Sep 2021Numerical weather prediction (NWP) models have been increasing in skill and their capability to simulate weather systems and provide valuable information at convective scales has improved in recent years. Much effort has been put into developing ...Read more
Author:Stylianides, TDate:Oct 1998This paper describes a model which has been applied in practice to determine an optimal plan for clinker capacity expansion. The problem was formulated as an integer linear program aiming to determine the optimal number, size and location of ...Read more
Author:Kasum, J; Pilic, M; Jovanovic, Nebojsa; Pienaar, Harrison HDate:Oct 2019Forensic science plays a vital role in the work of judicial bodies. The contents, knowledge, and specialized expertise permit the identification of facts essential to law enforcement and judicial disputes. Hydrography is an applied science ...Read more