Author:Thomalla, Sandy J; Nicholson, Sarah-Anne; Ryan-Keogh, Thomas J; Smith, Marie EDate:Aug 2023Climate change is expected to elicit widespread alterations to nutrient and light supply, which interact to influence phytoplankton growth and their seasonal cycles. Using 25 years of satellite chlorophyll a data, we show that large regions ...Read more
Author:Kekana, H; Landwehr, Gregory BDate:Jun 2019The wind capacity factor calculator is developed to perform two main tasks: to estimate the annual energy production from the wind resource at any location in South Africa, and to compare the two datasets used in its operation with standard ...Read more
Author:Rouault, Marjolaine J; Verley, P; Backeberg, Bjorn-ChristophDate:2016Sea surface temperature (SST) estimated from the Advanced Microwave Scanning Radiometer E onboard the Aqua satellite and altimetry-derived sea level anomalies are used south of the Agulhas Current to identify warm-core mesoscale eddies ...Read more
Author:Karamanski, Stefan; Erfort, GDate:Apr 2023South Africa’s energy network is under severe pressure due to low supply and overwhelming demand. With an increase in renewable energy providers, specifically wind energy, knowing how the supply can satisfy the electricity demand may relieve ...Read more
Author:Domingues, R; Goni, G; Swart, S; Dong, SDate:Feb 2014The variability of the Antarctic Circumpolar Current (ACC) system is largely linked to the atmospheric forcing. The objective of this work is to assess the link between local wind forcing mechanisms and the variability of the upper-ocean ...Read more
Author:Morelli, Mauro FDate:Nov 2022This item is the John Weston Memorial Lecture and comprises a conference presentation providing details on a career involving wind tunnel testing (1990-2022).Read more
Author:Goliger, Adam MDate:Apr 2010In recent years large-scale global sports events and related ventures have received significant international media coverage and socio-economic support from the hosting countries. This is especially evident in respect of all recent Olympic ...Read more
Author:Cloete, R; Loock, JC; Mtshali, Thato N; Fietz, S; Roychoudhury, ANDate:Apr 2019First measurements of labile dissolved copper (LdCu) and dissolved zinc (dZn) and nickel (dNi) in the Atlantic sector of the Southern Ocean in winter are compared with summer data at reoccupied stations in order to better understand the winter ...Read more
Author:Smit, AJ; Fitchett, JM; Engelbrecht, FA; Scholes, RJ; Dzhivhuho, G; Sweijd, Neville ADate:Jul 2020SARS-CoV-2 virus infections in humans were first reported in December 2019, the boreal winter. The resulting COVID-19 pandemic was declared by the WHO in March 2020. By July 2020, COVID-19 was present in 213 countries and territories, with ...Read more
Author:Khoza, NN; Grové, TDate:Jun 2012Silicosis has long been associated with non-mining industries; however, there has been a paucity of studies regarding silica dust exposure in these industries. Silicosis is an incurable and non-reversible disease, but is highly preventable. ...Read more
Author:Pelders, Jodi; Schutte, SDate:Feb 2021Worker participation in equipment development can result in improved user acceptance and product quality. This paper focuses on worker engagement in equipment development processes in the South African minerals sector. Qualitative data was ...Read more
Author:Wall, K; Clinton, DD; Sanio, MR; Botha, D; Cleland, A; Negussey, D; Lewis, SDate:Apr 2013The Standing Committee on Engineering Capacity Building of the World Federation of Engineering Organisations in October 2010 launched the first edition of a guidebook setting out its understanding of the challenges and complexities facing the ...Read more
Author:Burke, Ivan D; Van Heerden, Renier PDate:Oct 2017Data breaches are becoming more common and numerous every day, where huge amount of data (corporate and personal) are leaked more frequently than ever. Corporate responses to data breaches are insufficient, when commonly remediation is minimal. ...Read more
Author:Vincent, K; Cull, T; Archer, Emma RM; Awiti, ADate:Aug 2012Increased public awareness, and the concomitant growth in political commitment to mitigation and adaptation, has made the need for accurate and relevant communication of scientific information on climate change more pressing (Fischoff, 2011). ...Read more
Author:Grobler, TL; Van Zyl, AJ; Olivier, JC; Kleynhans, W; Salmon, BP; Penzhorn, WTDate:Jan 2012In this paper we reviewed Wu’s algorithm and introduced it as a cryptanalysis technique. This study reveals that when Wu’s algorithm is used for cryptanalysis it simplifies. This is true because Wu’s algorithm has to be applied to binary ...Read more
Author:Muchavi, Noluntu S; Bam, L; De Beer, FC; Chikosha, Silethelwe; Machaka, RonaldDate:Oct 2016Parts manufactured through power metallurgy (PM) typically contain pores that can be detrimental to the final mechanical properties. This paper explores the merits of 3D X-ray computed tomography over traditional microscopy for the characterization ...Read more
Author:Barnier, V; Heintz, O; Roberts, DE; Oltra, R; Costil, SDate:Apr 2006During laser cleaning of aluminium in ambient atmosphere, modifications of the metal surface can be induced by transient thermal effects. This work aims to characterize the modification of the aluminium oxide layer on pure aluminium for a ...Read more
Author:Bolokang, AS; Phasha, MJ; Oliphant, C; Motaung, DDate:Jan 2011In the current study, results of the milled and sintered V, W, C, Co powders are presented. Analytical techniques such as SEM equipped with EDS and XRD were used to study microstructure and phase evolution, respectively. In addition to B1 ...Read more