Author:Esser, MJD; Preussler, DR; Bernhardi, EH; Bollig, C; Posewang, MDate:Oct 2009High power operation at 1818 and 1915 nm has been demonstrated from a Tm:GdVO4 laser operating in quasi-continuous-wave mode with a maximum measured power of 8.7Wand a laser output energy of 175 mJ was observed in a 20 ms pulse at 1.9 µm. The ...Read more
Author:Meyer, T; Moodley, K; Sattler, UDate:Jul 2014The preferential approach to nonmonotonic reasoning was consolidated in depth by Krause, Lehmann and Magidor (KLM) for propositional logic in the early 90's. In recent years, there have been efforts to extend their framework to Description ...Read more
Author:Simpson, BRS; Morris, WMDate:Feb 2004The measurement of Mn-54 and Zn-65 by liquid scintillation coincidence counting results in low detection efficiencies. The activity obtained from the extrapolation of efficiency data can therefore become problematic if curvature is present. ...Read more
Author:Esser, MJD; Bollig, C; Preussler, DRDate:2006In this work, the thermal lenses generated in diode-end-pumped Nd:YVO4 and Nd:GdVO4 lasers were evaluated and compared using a simple technique based on the stability criteria of a plane-parallel laser resonator [example 1], as shown in the ...Read more
Author:Bollong, CA; Vogel, JC; Jacobson, L; Van der Westhuizen, WA; Sampson, CGDate:Jan 1993Several 14C dates have been obtained from the fibre temper in cooking bowls made by the forbears of the Zeekoe River Bushmen (Basarwa), South Africa. Although the temper appears to be burned grass, the Q (13) C values do not match those of ...Read more
Author:Adesina, AJ; Kumar, KR; Sivakumar, V; Griffith, DDate:01 Dec 2014The present study uses the data collected from Cimel Sunphotometer of Aerosol Robotic Network (AERONET) for the period from January to December, 2012 over an urban site, Pretoria (PTR; 25.75°S, 28.28°E, 1449 m above sea level), South Africa. ...Read more
Author:Morrison, A; Hietkamp, S; Van Vuuren, DSDate:Aug 2004A direct reduction process for refractory oxides and a life cycle analysis comparison with conventional pelletising and sintering process for chargechrome are presented. The new route has potential to reduce the environmental impact of the ...Read more
Author:Molobi, E; Sacks, N; Theron, MarithaDate:Nov 2021In this study a cemented tungsten carbide rotary burr prototype was fabricated using directed energy deposition based on an optimal parameter set which was previously derived from a full factorial design of experiments matrix approach. Finite ...Read more
Author:Kruger, A; Goliger, Adam M; Retief, JDate:Jul 2013Directional statistics provide design engineers with the opportunity to realise considerable cost savings, but these are not yet provided for in the South African standard for wind loading. The development of the directional statistics of ...Read more
Author:Greyling, T; Huntley, BJDate:Dec 1984This Directory provides detailed information on 155 conservation areas of greater than 1 000 ha administered by government and statutory bodies in the Republics of South Africa, Transkei, Bophuthatswana, Ciskei and Venda, and the Kingdoms of ...Read more
Author:Napier, Mark; Coulson, J; Matsebe, GNDate:2006This chapter is based on work undertaken for an international comparative study on 'enable environments' which included case studies in Pretoria (South Africa) and New Dehli (India), with the focus being the four case study settlements in the ...Read more
Author:Van Niekerk, Lara; Taljaard, Susan; Lamberth, SJ; Adams, JB; Weerts, Steven P; MacKay, CFDate:May 2022Globally, the ability of estuaries to sustain functionality and productivity is deteriorating rapidly under ever-increasing anthropogenic pressures. We present a systematic approach to identify, characterise and rank global pressures affecting ...Read more
Author:Bruwer, A; Van Staden, M; Le Roux, Alize; Van Niekerk, Cornelia WDate:Dec 2017The 2015 Global Assessment Report on Disaster Risk Reduction concludes that the mortality and economic loss associated with extensive risks (minor but recurrent disaster risks) in low- and middle-income countries are trending up. In the last ...Read more
Author:Van Zyl, MDate:Sep 2000The objectives of the investigation described in this report (GAP502) were the same as those of the previous SIMRAC projects, i.e. to verify, and possibly refine, the discard criteria of SABS0293. For this investigation special emphasis had ...Read more
Author:Oelofse, Suzanna HH; Viljoen, P; Taljaard, Susan; Botes, WAMDate:2004The National Water Act, 1998 (Act 36 of 1998) mandates the Department of Water Affairs and Forestry to manage all water containing waste (wastewater), which emanates from land-based sources and which directly impact on the marine environment. ...Read more
Author:Schlunz, Georg I; Barnard, EDate:Dec 2013This 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, rather than any ...Read more
Author:Fanucchi, StephanieDate:Aug 2017Dr Fanucchi is a South African born cell biologist who was recently awarded the 2017 L'Oreal/UNESCO International Rising Talent Award (15 of which are awarded worldwide annually); she was also a finalist for the 2016/2017 TW Kambule-NSTF Award ...Read more
Author:Nthambeleni, R; Moodley, N; Maharaj, VJ; Klimkait, T; Matter, A; Sewnarain, P; Naidoo, DashnieDate:01 Sep 2010HIV/AIDS is now the leading cause of death in Sub-Saharan Africa and has moved up to fourth place among all causes of death worldwide. According to estimates from the UNAIDS 2009 report (UNAIDS 2009) on the global AIDS epidemic, around 33.4 ...Read more
Author:Petersen, C; Jovanovic, Nebojsa; Genthe, BettinaDate:Jul 2012The polluted Upper Olifants River, in Mpumalanga, has been the focus for many studies in recent years. However, a group of researchers from the CSIR are now also studying an element of the system which has to date been largely overlooked, ...Read more