Author:Pelly, SC; Parkinson, CJ; Van Otterlo, WAL; De Koning, CBDate:09 Dec 2005The metathesis reaction is used as a key step for the synthesis of the indolo [2,3-a] carbazole core of rebeccamycin 13 and the sulfur analog of furostifoline 21. Using the same methodology for the attempted synthesis of furostifoline, the ...Read more
Author:White, N; teWaterNaude, J; Van der Walt, A; Ravenscroft, G; Roberts, W; Ehrlich, RDate:Sep 2009Community concern about asthma prompted an epidemiological study of children living near a petrochemical refinery in Cape Town, South Africa. Because of resource constraints and the complexity of refinery emissions, neither direct environmental ...Read more
Author:Creedy, DP; Phillips, HRDate:Aug 1997This report reviews the state of knowledge on the occurrence, investigation, detection, monitoring, prevention and dispensation of methane layers in coal mines. Mining practice throughout the world in respect of methane layering is generally ...Read more
Author:Creedy, DPDate:Jun 1999The primary aim of the project was to assess the current status of research on methane emission prediction for collieries in South Africa in comparison with methods used and advances achieved elsewhere in the world.Read more
Author:Louw, EKDate:Dec 2013Electrochemical atomic layer deposition technique was chosen in this study for the deposition of platinum nanostructures onto various substrates such as carbon paper, nickel foam and titanium mesh. Electrochemical evaluation and morphological ...Read more
Author:Modibedi, Remegia M; Masombuka, T; Hietkamp, S; Mathe, Mahlanyane KDate:Jun 2009Pt-Ru-P was prepared by the chemical reduction method using sodium hypophoshite as a reducing agent on Vulcan XC 72 and multi-walled carbon nano-tubes (MWCNTs). Sodium citrate was added as the stabilizer during electro-catalyst preparation. ...Read more
Author:Mathe, Ntombizodwa R; Scriba, Manfred R; Coville, NJDate:Nov 2014Bimetallic Pt nanoparticles were prepared by alloying Pt with the non-noble transition metals, Co and Ni, using a conventional heat-treatment (HT) method and microwaveirradiation (MW). The resulting samples were PteCo-Ht, PteNi-HT, PteCo, MW ...Read more
Author:Kirton, A; Scholes, B; Archibald, SDate:Aug 2010Often researchers are interested in obtaining estimates of variables which are quite difficult or expensive to measure. To obtain these estimates, relationships between those variables of interest and more easily measured variables are used. ...Read more
Author:De Vries, M; Van der Merwe, A; Kotzé, Paula; Gerber, ADate:Dec 2011Staying competitive in the 21st century requires enterprise unity and integration, allowing for agility to accommodate swift changes in strategy as markets evolve and new opportunities emerge. The foundation for execution approach acknowledges ...Read more
Author:Heyns, T; Heyns, PS; De Villiers, JPDate:Apr 2012Current haul road management techniques, such as routine, periodic and urgent maintenance have shortcomings in many complex haul road environments. Real-time road condition monitoring may significantly reduce maintenance costs, both to the ...Read more
Author:Roberts, MBDate:Sep 1976The minimum quantity of chromate necessary for the production of deep colors of high wet fastness on wool is shown for four chrome dyes.Read more
Author:Adebesin, F; Kotzé, Paula; Ritz, D; Foster, R; Van Greunen, DDate:May 2014There is growing concern over the fragmentation and inability of healthcare information systems (e-health systems) to exchange pertinent healthcare information that can empower healthcare professionals to make informed decisions regarding the ...Read more
Author:Venter, SN; Kuhn, AL; Harris, JDate:1998The increased threat of faecal pollution in recent years and the high priority of protecting human health by the government led to the initiation of a national microbial monitoring programme for surface water in South Africa. According to the ...Read more
Author:Lysko, Albert ADate:Mar 2010A novel method has been devised where one set of higher order polynomial-based basis functions can be applied over several wire segments, thus permitting to decouple the number of unknowns from the number of segments, and so from the geometrical ...Read more
Author:Lysko, Albert ADate:Mar 2010A novel method has been devised where one set of higher order polynomial-based basis functions can be applied over several wire segments, thus permitting to decouple the number of unknowns from the number of segments, and so from the geometrical ...Read more
Author:Mofolo, M; Lysko, Albert A; Clarke, WDate:Sep 2010This paper presents a method of electronic beam steering for a smart antenna system based on a switched parasitic array. The antenna system is made up of circular array of half wave dipoles, with four parasitic elements positioned equidistantly, ...Read more
Author:Denneman, EDate:Aug 2010Fatigue cracking is an important mode of failure in hot-mix asphalt (HMA). As part of the revision of the South African pavement design method (SAPDM) a need was identified to assess the fracture toughness of HMA in terms of fracture energy. ...Read more
Author:Taljaard, Susan; Lemley, DA; Van Niekerk, LaraDate:Aug 2022Situated at the land-sea interface, estuaries are susceptible to land- and sea-based sources of pollution. Despite growing scientific evidence of deterioration in water quality, quantitative methods to translate such information in support ...Read more
Author:Brill, G; Anderson, P; O’Farrell, PatrickDate:May 2017This study contributes to both the methodological and empirical literature by developing an integrative approach to assessing temporal and spatial change in riparian ecosystem service delivery by drawing on available and diverse data sets. ...Read more