Author:Machaka, Ronald; Mwakikunga, Bonex W; Manikandan, E; Derry, TE; Sigalas, IDate:2011Despite hot pressing being the most popular method of consolidating B6O powder, the Raman spectrum of polycrystalline hot-pressed B6O was until now poorly understood. Yet, recent reports have contributed to the understanding of only high-pressure ...Read more
Author:Moodley, MKDate:05 Jul 2006In Raman spectra of SWCNTs, there are many features which can be identifed with specific phonon modes and with specific Raman scattering processes that contribute to each feature. Mechanical, elastic and thermal properties are strongly ...Read more
Author:Andreev, GN; Barzev, ADate:16 Dec 2003The ability of Raman spectroscopy to investigate chemical substances in water media was applied for studying the surface products of the chalcopyrite-sodium isopropyl xanthate flotation system. Performing the reaction in model conditions, ...Read more
Author:Mwakikunga, Bonex W; Sideras-Haddad, E; Forbes, A; Arendse, CDate:2008Novel optical and electrical properties of newly synthesized nano-wires of monoclinic WO3 and nano-belts of rutile VO2 have been investigated by Raman spectroscopy and thermochromism studies respectively. Phonon confinement is observed in the ...Read more
Author:Thackeray, MM; Rossouw, MH; Gummow, RJ; Liles, DC; Pearce, K; De Kock, A; David, WIF; Hull, sDate:Jun 1993A pure and highly crystalline form of ramsdellite-MnO2 has been synthesized by acid treatment of the spinels LiMn2O4 and Li2Mn4O9 at 95°C. Although the ramsdellite-MnO2 framework remains intact on lithiation at 70°C, the hexagonally-close-packed ...Read more
Author:Du Preez, M; Conroy, RM; Ligondo, S; Hennessy, J; Elmore-Meegan, M; Soita, A; McGuigan, KGDate:Sep 2011The authors report the results of a randomized controlled intervention study (September 2007 to March 2009) investigating the effect of solar disinfection (SODIS) of drinking water on the incidence of dysentery, nondysentery diarrhea, and ...Read more
Author:Mellor, JR; Coville, NJ; Sofianos, AC; Copperthwaite, RGDate:23 Dec 1997The initial Raney copper WGS activity based on catalyst volume has been shown to be comparable to industrial and co-precipitated alternatives under varying reaction conditions. The presence of zinc oxide in the Raney copper structure was shown ...Read more
Author:Mellor, JR; Coville, NJ; Sofianos, AC; Copperthwaite, RGDate:23 Dec 1997Characterisation of partially leached Raney copper catalysts demonstrated that the chemical nature of the reactant surface could be determined by controlling the leaching process. Initial water-gas shift (WGS) activity of the Raney copper ...Read more
Author:Mkwelo, Simpiwe; Nicolls, F; De Jager, GDate:Nov 2007This paper presents another approach to segmenting a scene of rocks on a conveyor belt for the purposes of measuring rock size. Rock size estimation instruments are used to monitor, optimize and control milling and crushing in the mining ...Read more
Author:Olwal, TO; Van Wyk, BJ; Djouani, K; Hamam, Y; Siarry, P; Ntlatlapa, Ntsibane SDate:Aug 2009Multi-Radio Multi-Channel (MRMC) systems are key to power control problems in Wireless Mesh Networks (WMNs). In this paper, researchers present a range based dynamic power control for MRMC WMNs. First, WMN is represented as a set of disjoint ...Read more
Author:De Witt, JJ; Nel, Willem AJDate:Oct 2008A dechirp on receive (DoR) concept demonstrator was recently implemented on the Fynmeet radar system of the CSIR, in an attempt to extend its high range resolution (HRR) measurement capabilities. Based on the low dynamic range observed in ...Read more
Author:Mkwelo, Simpiwe; De Jager, G; Nicolls, FDate:Nov 2007This paper presents another approach to segmenting a scene of rocks on a conveyor belt for the purposes of measuring rock size. Rock size estimation instruments are used to monitor, optimize and control milling and crushing in the mining ...Read more
Author:Guest, IW; Pauw, CKDate:Apr 1993A rank detector is used to defect instantaneous received power fades in tracking radar. On detection of a fade, censorship of the angular position measurement is implemented in a Kalman tracking filter. It is shown that this technique can ...Read more
Author:Landman, WA; Barnston, AG; Vogel, CDate:Sep 2015Some of the biggest emerging markets economies include countries in South America, Asia and Africa. In the global south, political and developmental similarities (e.g. climate variability occurring in conjunction with marked developmental ...Read more
Author:du Preez, WB; de Beer, DJDate:Jun 2006The ability to design and develop new products is generally accepted as a strong enabler for improving the competitiveness of a country’s manufacturing industry. This paper describes the establishment and evolution of the Rapid Product ...Read more
Author:Mtsweni, Jabu S; Abdullah, HDate:Nov 2014Information and communication technologies (ICTs) have an immense potential as a tool for development. It is now common knowledge that advances in the use of technology can improve economic opportunities for the poor, improve service delivery ...Read more