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
Author:Ibrahim, AH; Roux, FS; Konrad, TDate:Nov 2014When a pair of photons that are entangled in terms of their transverse modes, such as an orbital angular momentum (OAM) basis, propagates through atmospheric turbulence, the scintillation causes a decay of the entanglement. Here, we use ...Read more
Author:Page, Philip R; Abu-Mahfouz, Adnan MI; Yoyo, SonwabisoDate:Sep 2017Reducing pressure in a water distribution system leads to a decrease in water leakage, decreased cracks in pipes, and consumption decreases. Pressure management includes an advanced type called remote real-time control. Here pressure control ...Read more
Author:Klein, Peter; Roos, TH; Sheer, TJDate:Aug 2015The development of a high temperature Thermal Energy Storage (TES) system will allow for high solar shares in Solar Gas Turbine (SGT) plants. In this research a pressurised storage solution is proposed that utilises a packed bed of alumina ...Read more
Author:Klein, Peter; Roos, TH; Sheer, TJDate:Aug 2015The development of a high temperature Thermal Energy Storage (TES) system will allow for high solar shares in Solar Gas Turbine (SGT) plants. In this research a pressurised storage solution is proposed that utilises a packed bed of alumina ...Read more
Author:Folorunso, O; Hamam, Y; Sadiku, R; Ray, Suprakash S; Joseph, ADate:Jul 2019The problem associated with mixtures of llers and polymers is that they result in mechanical degradation of the material (polymer) as the ller content increases. This problem will increase the weight of the material and manufacturing cost. ...Read more
Author:Dada, M; Popoola, P; Mathe, Ntombizodwa R; Pityana, Sisa L; Adeosun, SDate:Aug 2020In this study, a full-factorial design of experiments was systematically structured to optimize the laser processing parameters of additively manufactured high entropy alloys by determining the impact of these parameters on the mechanical ...Read more
Author:Marais, Laurette; Pretorius, LDate:Jul 2023While Grammatical Framework (GF) resource grammars are primarily intended as linguistic software libraries, they can also be employed to enable syntax parsing via the GF runtime system. The isiZulu resource grammar (ZRG) in conjunction with ...Read more
Author:Godfrey, Linda K; Scott, D; Difford, M; Trois, CDate:Nov 2012An empirical study was undertaken with 31 organisations submitting data to the South African Waste Information System (SAWIS) in order to explore the relationship between data and resultant waste knowledge generated through a process of ...Read more
Author:Godfrey, Linda K; Scott, D; Difford, M; Trois, CDate:Jun 2012Combining the process of learning and the theory of planned behaviour into a new theoretical framework provides an opportunity to explore the impact of data on waste behaviour, and consequently on waste management, in South Africa. Fitting ...Read more
Author:Duma, M; Twala, B; Nelwamondo, Fulufhelo V; Marwala, TDate:Sep 2013We propose a hybrid missing data imputation technique using positive selection and correlation-based feature selection for insurance data. The hybrid is used to help supervised learning methods improve their classification accuracy and ...Read more
Author:Versfeld, DBDate:1995South Africa has hundreds of thousands of hectares of heavily populated and badly degraded landscapes. Past attempts at land management have been either through avoidance or the top-down imposition of ''betterment'' schemes. Participatory ...Read more
Author:Liebermann, S; Coulson, JDate:Oct 2004Community policing remains more a talked-about concept than a practice actually taking place in South Africa today. In spite of much legislation pointing to the need for people's participation, there is limited understanding of how this should ...Read more
Author:Gerber, G; Diedericks, G; Basson, GRDate:Mar 2011Particle image velocimetry scalar measurements were carried out on the body of a stably stratified density current with an inlet Reynolds number of 2,300 and bulk Richardson number of 0.1. These measurements allowed the mass and momentum ...Read more