Author:Roux, FSDate:Oct 2013Optical vortices are always created or annihilated as vortex dipoles — pairs with opposite topological charge. Here a quantity, consisting of the transverse first and second derivatives of the optical field, is derived with which one can ...Read more
Author:Burger, L; Litvin, I; Ngcobo, Sandile; Forbes, ADate:Mar 2014The beam from a laser resonator is determined by the optical elements it contains. Most commonly, these consist of two spherical mirrors, but phase- and amplitude-modulating elements can also be included to produce custom beams. For every ...Read more
Author:Walwyn, DR; Taylor, D; Brickhill, GDate:Sep 2002Risk management practices in the R&D departments of many chemical and pharmaceutical companies lack much of the rigor and sophistication of the equivalent corporation in the financial sector. For instance investment decisions on research ...Read more
Author:Booth, R; Meyer, TDate:Feb 2011Most approaches to iterated belief revision are accompanied by some motivation for the use of the proposed revision operator (or family of operators), and typically encode enough information in the epistemic state of an agent for uniquely ...Read more
Author:Bischof-Niemz, Thomas; Roro, Kittessa T; Milazi, DominicDate:2015In South Africa, embedded PV is at retail grid parity today. It is even cost-competitive to alternative new-build options (“new-build parity”). Many electricity customers are therefore already installing embedded PV. This would lead to an ...Read more
Author:Bischof-Niemz, Sebastian T; Roro, Kittessa T; Milazi, Dominic BKDate:Sep 2015Due to drastically reduced prices for Photovoltaic (PV) systems and significantly increased electricity tariffs recently, small scale embedded generators (particularly PV units) are now attractive for many electricity customers in South Africa. ...Read more
Author:Burke, Ivan D; Pieterse, HeloiseDate:Mar 2015The Android mobile market has expanded greatly in recent years, but with its increased market share Android became a popular target for malware developers. The latest Anti-Virus reports suggest that Android account for the majority of malware ...Read more
Author:Thwala, Melusi; Musee, N; Sikhwivhilu, L; Wepener, VDate:Sep 2013The dispersion of nAg and nZnO engineered nanoparticles (ENPs) in water was investigated through the dissolution and agglomeration analysis over a 14 days exposure period. Before testing, the ENPs were in the nanoscale: 40-60 and 10-130 nm ...Read more
Author:Van Wyk, E; Van Wilgen, BW; Roux, DJDate:Sep 2001Since the era of great water engineering works in South Africa, there has been a major shift in the thinking and approach to water resources management. Previous focus on water supply has been replaced by demand management initiatives and the ...Read more
Author:Du Toit, JDate:Oct 2017This presentation discusses the basics of product development, and how it is influenced and affected by Industry 4.0.Read more
Author:Shibambu, Ncedisa AM; Moganedi, SDate:Dec 2022The notion of working from home is not a new concept. However, it has become a buzzword amid the COVID19 pandemic. Some scholars were already engaging in the work-from-home concept a few years before the pandemic. However, contextualization ...Read more
Author:Olukanmi, P; Nelwamondo, Fulufhelo V; Marwala, TDate:Aug 2020This paper introduces a hybridization of the k-means and k-medoids paradigms. The new algorithms is named HP (hybrid partitioning) algorithm. Specifically, we improve on a recently developed scalable version of k-means (k-means-lite), by ...Read more
Author:Ssamula, B; Venter, CDate:Jul 2007This paper analyses a study aimed at testing the cost effectiveness of designing a hub and spoke network (H&S network”) for Africa that allows airlines to reduce the costs of travel and increase connectivity. Various hub networks are designed ...Read more
Author:Heera, J; Pretorius, HC; Erasmus, Louwrence DDate:Oct 2023The South African Local Government is currently experiencing a backlog in providing basic services to its citizens due to financial constraints, lack of planning, poor project management and integration between sector departments. The South ...Read more
Author:Featherstone, Coral; Van der Poel, EDate:Jul 2017There are some aspects of visualisation that are uniquely human. This is because data visualisation is heavily influenced by the science of human visual perception, much of which emerged from the Gestalt School of Psychology. Humans can ...Read more
Author:Dickens, JS; Green, JJ; Van Wyk, MADate:Jul 2011Underground mine automation has the potential to increase safety, productivity and allow the mining of lower-grade resources. In a mining environment with both autonomous robots and humans, it is essential that the robots are able to detect ...Read more
Author:Venter, Karien; Labuschagne, FJJ; Le Roux, M; Cloete, GDate:Oct 2013Worldwide, fatigue has been cited as a contributory cause in heavy vehicle crashes. In South Africa very little scientific evidence is available to support or reject this notion. A study was commissioned to investigate the role fatigue plays ...Read more
Author:Garland, Rebecca M; Rother, HDate:Oct 2017Southern Africa has multiple risks that contribute to the overall burden of disease (i.e. the quadruple burden of disease), which may make people more vulnerable to the health impacts from climate change. In addition, the sector is vulnerable ...Read more
Author:Wright, CY; Garland, Rebecca M; Norval, M; Vogel, CDate:Aug 2014Climate change is projected to lead to warmer temperatures, especially in southern Africa, where the warming is predicted to be 2°C higher than the global increase. Given the high burden of disease already associated with environmental factors ...Read more