Author:Kganyago, KR; Ngoepe, PE; Catlow, CRADate:Mar 2003Energetics of the anode system LiC6 compared to metallic lithium is calculated within the framework of local-density functional theory (LDA-DFT) techniques. Our results suggest that the energy of anode intercalation results in a small change ...Read more
Author:Mangena, SJ; De Korte, GJ; McCrindle, RI; Morgan, DLDate:15 Oct 2004Five ultra fine bituminous coals from the Witbank coalfield were studied. Selected chemical and physical properties, coal petrographic characteristics and mineralogical compositions of the coals were measured. The coals were compacted, using ...Read more
Author:Parmaliana, A; Frusteri, F; Mezzapica, A; Miceli, D; Scurrell, MS; Giordano, NDate:Sep 1993The partial oxidation of methane to formaldehyde by molecular oxygen on silica and silica-supported oxide catalysts has been investigated at a pressure of 1.7 bars in the temperature range 520-650°C by using a batch reactor with external ...Read more
Author:Bally, RDate:1986This bibliography covers the literature relating to sandy beaches on the African continent and outlying islands. The bibliography lists biological, chemical, geographical and geological references and covers shallow marine sediments, surf ...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: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:Von Woff, WTEDate:1978In the last few years there has been a growing interest in the reactivity of low temperature coke and char towards carbon dioxide. The equation of Hedden, derived for the calculation of the reactivity of metallurgical coke containing negligible ...Read more
Author:Sayle, TXT; Catlow, CRA; Maphanga, RR; Ngoepe, PE; Sayle, DCDate:21 Sep 2005Models of MnO2 nanoparticles, with full atomistic detail, have been generated using a simulated amorphization and recrystallization strategy. In particular, a 25,000-atom "cube" of MnO2 was amorphized (tension-induced) under molecular dynamics ...Read more
Author:Oliphant, CJ; Arendse, CJ; Knoesen, D; Muller, TFG; Prins, S; Malgas, GFDate:May 2011The authors report on the growth kinetics of hydrogenated nanocrystalline silicon, with specific focus on the effects of the deposition time and hydrogen dilution on the nano-structural properties. The growth in the crystallite size, attributed ...Read more
Author:Gummow, RJ; De Kock, A; Thackeray, MMDate:Apr 1994The rechargeable capacity of 4 V LixMn2O4 spinel cathodes (0 < x <= 1) has been improved by modifying the composition of the spinel electrode. Stable rechargeable capacities in excess of 100 mAh/g in flooded-electrolyte lithium cells can be ...Read more
Author:Gregory, MA; McClurg, TP; Brouckaert, CJDate:Jan 2003Marine pollution monitoring surveys often include the measurement of heavy metals and other trace elements in sediments from multiple stations around marine outfalls. EDX may offer a supplementary, relatively cheap and rapid screening method ...Read more
Author:Chidembo, AT; Ozoemena, KI; Agboola, BO; Gupta, V; Wildgoose, GG; Compton, RGDate:Nov 2010The supercapacitive properties of nickel(II) tetraaminophthalocyanine(NiTAPc)/multi-walled carbon nanotube(MWCNT) nanocomposite films have been interrogated for the first time and found to possess a maximum specific capacitance of 981 ± 57 F ...Read more
Author:Parmaliana, A; Frusteri, F; Mezzapica, A; Scurrell, MS; Giordano, NDate:07 May 1993Vanadium oxide-silica catalysts can effect the partial oxidation of methane to formaldehyde with extremely high activities and the space time yield (STY) can reach a value in excess of 800 g kg-1cat h-1; bare silica also shows appreciable STY ...Read more
Author:Mathebula, NS; Pillay, J; Toschi, G; Verschoor, JA; Ozoemena, KIDate:2009Electrochemical impedimetric recognition by anti-mycolic acid antibodies, present in tuberculosis (TB)-positive human serum co-infected with human immunodeficiency virus (HIV), of mycolic acids (MA) integrated into a self-assembled monolayer ...Read more
Author:De Picciotto, LA; Adendorff, KT; Liles, DC; Thackeray, MMDate:Aug 1993The crystal structures of Li1.2V3O8 and a lithiated product Li4.0V3O8 have been determined by single-crystal X-ray diffraction methods. The structure refinement of Li1.2V308 confirms that of Li1+xV3O8(x almost-equal-to 0) reported by Wadsley ...Read more
Author:Liles, DC; Verhoeven, PFMDate:06 Sep 1996Treatment of [RuHL (5)] (+) (L = PMe (2) Ph) with phenylacetylene in ethanol yielded the dimerization of HC=CPh to (Z)-1, 4-diphenylbut-3-en-1-yne. The molecular structure of [Ru(eta(3)-PhC(3)CHPh)L(4)](PF6) (L = PMe(2)Ph) (2) shows a ...Read more
Author:Manase, G; Nkuna, Z; Ngorima, EDate:Sep 2009South Africa is faced by a number of challenges that include low water and sanitation coverage in rural and peri-urban areas, high unemployment and increasing inequality between the rich and the poor as indicated by a Gini coefficient of 0.77; ...Read more
Author:Greben, HA; Baloyi, LJ; Eisberg, R; Joubert, LM; Botha, A; Venter, SNDate:May 2006Acid Mine Drainage (AMD) needs to be treated, before it is recharged in rivers and dams. The biological treatment of AMD can be applied using degradation products of cellulose, for example Volatile Fatty Acids as carbon sources. The aim of ...Read more