Author:Vogel, JC; Fuls, A; Visser, EDate:Mar 2001High-precision radiocarbon dating of a millennium-old yellowwood tree from the Midlands of Natal shows that the tree-rings do, in general, record annual growth, but that both missing and false rings occur. At two places along the transect of ...Read more
Author:Ryan, PG; Steele, WK; Siegfried, WR; Vogel, JCDate:Nov 1992There are several problems associated with determining radiocarbon dates, particularly for organic material from Antarctica. However, this study attempts to find accurate measure of the length of time these radiocarbon dates have been established ...Read more
Author:Oschadleus, HD; Vogel, JC; Scott, LDate:Jan 1996The age of the peat, or 'lignite', layer in the Port Durnford Formation on the Zululand coast has been established to be about 70 kyr by means of the Th-230/U-234 disequilibrium dating technique. This date places the pent temporally at the ...Read more
Author:Loveday, Philip W; Long, Craig SDate:Dec 2019Ultrasonic guided waves have been shown to propagate large distances in continuously welded rail track.Read more
Author:Shackleton, CMDate:Mar 1999Woody community phenology was studied in the central lowveld, South Africa, over a twelve month period at three sites along a rainfall gradient, with both toplands and bottomlands sampled at each site. Each month, individual plants, in ...Read more
Author:Zunckel, M; Saizar, C; Zarauz, JDate:Apr 2003The aim in this paper is threefold: firstly to gain an initial understanding of rainwater chemistry in the northeast of Uruguay; secondly to identify possible sources that contribute to its chemical composition; and thirdly to establish a ...Read more
Author:Gibberd, Jeremy TDate:Dec 2022Different approaches have been developed to design rainwater harvesting systems. However, these have not been widely applied in schools and are not well understood. This paper presents findings from a study in which different rainwater water ...Read more
Author:Mayers, J; Evans, J; Foy, TDate:Oct 2001This report is about the changes taking place in South African forestry, the pros and cons of these changes and the prospects for a forest sector that can contribute to sustainable national development and local empowerment. Across many sectors ...Read more
Author:Mguda, Z; Faltenbacher, A; Van der Heyden, K; Gottlöber, S; Cress, C; Vaisanen, P; Yepes, GDate:Jan 2015In this paper we use the MareNostrum Universe Simulation, a large scale, hydrodynamic, non-radiative simulation in combination with a simple abundance matching approach to determine the ram pressure statistics for bent radio sources (BRSs). ...Read more
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