Author:Getz, WM; Pachter, MDate:1981The regions of capturability and draw are derived for a two-target pursuit-evasion differential game of two cars. Specifically, using geometric arguments, complete barrier surfaces are constructed that emanate from the boundaries of the usable ...Read more
Author:Christie, SI; Scholes, RJDate:Nov 1995Carbon (C) is stored by plantation forests either when ecosystems with a low C density (such as tropical grasslands) are afforested or when timber is converted to semi permanent products. If the afforestation rate is relatively constant and ...Read more
Author:Modibedi, Remegia M; Masombuka, T; Mathe, Mahlanyane KDate:Apr 2011Carbon supported Pd-Sn and Pd-Ru-Sn nanocatalysts were prepared by the chemical reduction method, using sodium borohydride and ethylene glycol mixture as the reducing agent. The catalytic activity towards ethanol electro-oxidation in alkaline ...Read more
Author:Ouma, CNM; Meyer, WEDate:Jun 2016Using both the Perdew-Burke-Ernzerhof (PBE) functional and the hybrid functional of Heyd-Scuseria-Ernzerhof (HSE06), the metastability of the carbon-substitutional-carbon-interstitial (C(subs)C(subi)) defect in silicon has been investigated ...Read more
Author:Williams, BG; MacPhail, C; Campbell, C; Taljaard, D; Gouws, E; Moema, S; Mzaidume, Z; Rasego, BDate:Jun 2000For all of the last century, the economy of South Africa, and so also of its neighbouring countries, has depended on migrant labour from rural areas. This is particularly so for the mining industry, especially hard-rock mining, and this has ...Read more
Author:Thambiran, Tirusha; Diab, RDDate:Aug 2011The relationship between air quality and climate change provides a scientific basis for developing integrative policies. Local governments in developing countries are expected to reap significant benefits from incorporating climate change ...Read more
Author:Said, MD; Funke, Nicola S; Jacobs-Mata, Inga M; Steyn, Maronel; Nienaber, SDate:Oct 2011In this paper the authors seek to identify the most appropriate model for a regional co-ordination mechanism for cholera preparedness, response and prevention. The qualitative mixed-method data collection approach that was followed revealed ...Read more
Author:Smith, CJ; Venter, JPDate:Nov 2011In the scope of Tactical Data Links (TDL), the South African National Defence Force (SANDF) started the journey to establish a national TDL capability with the commencement of their national Strategic Defence Procurement Packages (SDPP) in ...Read more
Author:Anochie-Boateng, Joseph; Tutumluer, E; Carpenter, SHDate:Nov 2010Oil sand is a generic name given to naturally occurring deposits of bituminous sand materials that are mined for crude oil production. These materials are currently used as subgrade materials of temporary and permanent roads in oil sand fields. ...Read more
Author:Goedhals-Gerber, LL; Haasbroek, LM; Van Dyk, Esbeth; Dodd, MDate:Aug 2016This study investigated the causes and extent of temperature breaks in the South African summer fruit export cold chain from the pack house to the vessel. Numerous causes of temperature breaks throughout the cold chain were found, resulting ...Read more
Author:Heveling, J; Nicolaides, CP; Scurrell, MSDate:11 Oct 1998The oligomerisation of ethylene into products in the C-4-C-20 range over heterogeneous nickel catalysts in a fixed-bed reactor at low temperature and high pressure (LT-HP) is reported. The catalysts were obtained by Ni (II) exchange or ...Read more
Author:Makgwane, Peter R; Ray, SSDate:2013The promotional effect of nanosized Ru, Fe, Au, and Mn particles on VOHPO(sub4) ·0.5H(sub2)O (VHP) catalytic properties was investigated in benzene hydroxylation reaction using hydrogen hydroperoxide (H(sub2)O(sub2) as oxidant. Catalytic ...Read more
Author:Butler, AC; Nicolaides, CPDate:31 Dec 1993The increased demand for isobutene, used for the production of the octane-enhancer methyl tert-butyl ether, has generated tremendous interest in the catalytic conversion of the linear butenes to isobutene. In this review we survey the progress ...Read more
Author:James, ADate:Mar 1997This paper describes the investigation of the catastrophic failure of a raise boring machine used for underground reaming operations. The results of the investigation indicate that failure was due to the fracture of the 32 drive head bolts, ...Read more
Author:Monteiro, Pedro MS; Matthews, SDate:Jul 2003An interdisciplinary, multi-institutional modelling research project, which will help improve scientific understanding of the linkages between river catchments and their associated coastal environments, was started in October 2002. Named the ...Read more
Author:Adetunji, KE; Hofsajer, IW; Abu-Mahfouz, Adnan MI; Cheng, LDate:Feb 2021Distributed generation (DG) units are power generating plants that are very important to the architecture of present power system networks. The primary benefits of the addition of these units are to increase the power supply and improve the ...Read more
Author:Mhlongo, Gugu H; Ntwaeaborwa, OM; Dhlamini, MS; Swart, HC; Hillie, KTDate:Oct 2010The successful incorporation of ZnO nanoparticles in Pr3+-doped SiO2 using a
sol–gel process is reported. SiO2:Pr3+ gels, with or without ZnO nanoparticles,
were dried at room temperature and annealed at 600 °C. On the basis of the
X-ray ...Read more