Author:Ramchuran, Santosh O; O’Brien, Frances F; Dube, Noluthando N; Ramdas, VDate:Jun 2023Recently, there has been a paradigm shift towards ‘greener’ processes/products, with emphasis being placed on sustainability. The traditional manufacturing processes require re-working and adapting new methods to ensure that they are more ...Read more
Author:Hersey, SP; Garland, Rebecca M; Crosbie, E; Schinger, T; Sorooshian, A; Piketh, S; Burger, RDate:Apr 2015The authors present a comprehensive overview of particulate air quality across the five major metropolitan areas of South Africa (Cape Town, Bloemfontein, Johannesburg and Tshwane (Gauteng Province), the Industrial Highveld Air Quality Priority ...Read more
Author:Banerjee, R; Ray, Suprakas SDate:Jan 2021The article reports recent advances in reference to the existing literature and presents a knowledge gap and potential solution ideas for polylactide (PLA) nanocomposites as sustainable materials. Various types of nanoparticles have been used ...Read more
Author:Theyse, HL; De Beer, Morris; Rust, FCDate:1996A historical overview of the South African mechanistic pavement design method, from its development in the early 1970s to the present, is presented. Material characterization, structural analysis, and pavement life prediction are discussed, ...Read more
Author:Anele, AO; Hamam, Y; Abu-Mahfouz, Adnan MI; Todini, EDate:Nov 2017The stochastic nature of water consumption patterns during the day and week varies. Therefore, to continually provide water to consumers with appropriate quality, quantity and pressure, water utilities require accurate and appropriate short-term ...Read more
Author:Maphoru, MV; Heveling, J; Kesavan Pillai, SreejaraniDate:Jul 2017Oxidative coupling of naphthols is a useful method for the formation of new carbon-carbon bonds in organic synthesis. In the presence of hydrogen peroxide, platinum supported on activated carbon catalyses this reaction. The outcome is influenced ...Read more
Author:Maphoru, MV; Heveling, J; Kesavan Pillai, SreejaraniDate:Jan 2014Bismuth-promoted platinum catalysts were tested for the oxidative coupling of 2- and 4-substituted 1-naphthols at different temperatures and ambient pressure. The principal final products are the 3,3'-substituted 1,1'-binaphthalenylidene-4,4'-diones ...Read more
Author:Thwala, Melusi; Musee, N; Sikhwivhilu, L; Wepener, VDate:Sep 2013The toxicity effects of silver (nAg) and zinc oxide (nZnO) engineered nanoparticles (ENPs) on the duckweed Spirodela punctuta were studied to investigate the potential risks posed by these ENPs towards higher aquatic plants. The influence of ...Read more
Author:Tshilombo, KG; Pistorius, PCDate:2007The authors argue the possibility of using an oxygen probe to follow iron removal during converting, if local equilibrium is established between iron in the matte and the iron oxides in the fayalitic slag. The oxygen activity is expected to ...Read more
Author:Waterhouse, JS; Switsur, VR; Barker, AC; Carter, AHC; Robertson, IDate:30 Jul 2002Annual oxygen and hydrogen isotope ratios in the alpha-cellulose of the latewood of oak (Quercus robur L.) growing on well-drained ground in Norfolk, UK have been measured. The authors have compared the observed values of isotope ratios with ...Read more
Author:Heyes, AMDate:Apr 2001Examination of a failed roof tube from a bagasse boiler showed transverse through-cracks and extensive pitting. The pitting was typically oxygen induced pitting and numerous fatigue cracks had started within these pits. It is highly probable ...Read more
Author:Masa, J; Ozoemena, K; Schuhmann, W; Zagal, JHDate:Aug 2012In this review, we describe and discuss the developments in the use of metalloporphyrins and metallophthalocyanines as catalysts for oxygen reduction in aqueous electrolytes. The main goal of most researchers in this field has been to design ...Read more
Author:Andrew, JE; Johakimu, Jonas K; Ngema, NEDate:Aug 2013Ozone use in conjunction with chlorine dioxide during pulp bleaching offers several advantages over conventional bleaching sequences that make use of chlorine dioxide only. Despite this, in South Africa, only one mill uses ozone. The current ...Read more
Author:Vogt, T; Pieters, R; Newman, Brent KDate:Apr 2018Polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were analysed from sediment samples collected in 2012 from rivers, surface runoff canals and estuaries in three highly urbanised ...Read more
Author:Zeevaart, JG; Parkinson, CJ; De Koning, CBDate:24 May 2004The coupling reaction between ethyl acetoacetate and a number of aryl halides in the presence of palladium acetate, a bulky and electron rich phosphine and K3PO4 is described. The arylated acetoacetate ester is de-acylated under the reaction ...Read more
Author:Zeevaart, JG; Parkinson, CJ; De Koning, CBDate:07 Mar 2005Alpha-Arylation of inethanesulfonamides using palladium catalysis is described. For example, treatment of N-benzyl-Nmethylmethanesulfonamide with catalytic Pd (OAc) (2) in the presence of sodium tert-butoxide, triphenylphosphine and toluene ...Read more
Author:Henriques, R; Griffiths, C; Rego, EH; Mhlanga, MusaDate:May 2011Live-cell fluorescence light microscopy has emerged as an important tool in the study of cellular biology. The development of fluorescent markers in parallel with super-resolution imaging systems has pushed light microscopy into the realm of ...Read more
Author:Henriques, R; Mhlanga, MusaDate:Jun 2009Super-resolution imaging allows the imaging of fluorescently labeled probes at a resolution of just tens of nanometers, surpassing classic light microscopy by at least one order of magnitude. Recent advances such as the development of ...Read more
Author:Burke, Michael G; Lasenby, JDate:Oct 2015This paper introduces a pantomimic gesture interface, which classifies human hand gestures using unmanned aerial vehicle (UAV) behavior recordings as training data. We argue that pantomimic gestures are more intuitive than iconic gestures and ...Read more