Author:Mhlongo, Gugu H; Dhlamini, MS; Swart, HC; Ntwaeaborwa, OM; Hillie, KTDate:Aug 2011Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphor powders with different concentrations of Eu3+ ions were synthesized by a sol–gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu3+ ions with the main ...Read more
Author:Olakanmi, EO; Tlotleng, Monnamme; Meacock, C; Pityana, Sisa L; Doyoyo, MDate:Jun 2013Surface treatment is one of the most costly processes for treating metallic components against corrosion. Laser-assisted cold spray (LACS) has an opportunity to decrease those costs particularly in transportation systems, chemical industries, ...Read more
Author:Venkatasamy, V; Jayaraju, N; Cox, SM; Thambidurai, C; Mathe, Mahlanyane K; Stickney, LJDate:Apr 2006This paper describes the first instance of HgTe growth by electrochemical atomic layer epitaxy (EC-ALE). EC-ALE is the electrochemical analog of atomic layer epitaxy (ALE) and atomic layer deposition (ALD), all of which are based on the growth ...Read more
Author:Selatile, Mantsopa K; Ray, Suprakas S; Ojijo, Vincent O; Sadiku, RDate:Feb 2018We have investigated the filtration properties of electrospun bio-based polylactide air filter membranes by studying the kinetics of filtration and the influence of fiber diameter, fiber size, and the nature of dust particles on the depth of ...Read more
Author:Prins, SN; Cornish, LA; Boucher, PSDate:10 Nov 2005The liquidus surface projection for the Al-Pt-Ru ternary system has been determined based on the micro-structural characterisation of arc-melted alloys. The liquidus surface is dominated by the similarity to RuAl phase, and slopes down to the ...Read more
Author:Ryan-Keogh, Thomas J; Thomalla, Sandy JDate:May 2020Chlorophyll fluorescence, primarily used to derive phytoplankton biomass, has long been an underutilized source of information on phytoplankton physiology. Diel fluctuations in chlorophyll fluorescence are affected by both photosynthetic ...Read more
Author:Mashabatu, M; Ntshidi, Zanele; Dzikiti, S; Jovanovic, N; Dube, T; Taylor, NJDate:Aug 2023Inaccurate crop coefficients are major contributing sources of uncertainty that lead to inefficient use of limited available water resources. Understanding the need to improve water use efficiency in South Africa’s fruit industry, this study ...Read more
Author:Debba, Pravesh; Carranza, EJM; Stein, A; Van der Meer, FDDate:Aug 2008This paper describes a quantitative methodology for deriving optimal exploration target zones based on a probabilistic mineral prospectivity map. The methodology is demonstrated in the Rodalquilar mineral district in Spain. A subset of known ...Read more
Author:Klarman, S; Gutierrez-Basulto, VDate:May 2013We introduce Description Logics of Context (DLCs) - an extension of Description Logics (DLs) for context-based reasoning. Our approach descends from J. McCarthy's tradition of treating contexts as formal objects over which one can quantify ...Read more
Author:Van Heerden, Renier P; Leenen, L; Irwin, BDate:Jun 2021The identification of network attacks in real-time is becoming increasingly important. Most Artificial Intelligence (AI) applications use machine learning to do the classification of attack types but the advantage of an ontological approach ...Read more
Author:Marais, Laurette; Van Zijl, LDate:May 2022Unary self-verifying symmetric difference automata have a known tight bound of 2n-1-1 for their state complexity. We now consider the non-unary case and show that, for every n=2, there is a regular language Ln accepted by a non-unary ...Read more
Author:Prince, SD; Wessels, Konrad J; Tucker, CJ; Nicholson, SEDate:Jul 2007In semiarid regions the ratio of annual net primary production to precipitation, rain-use efficiency (RUE), has been used as an index of desertification. In a recent publication (Hein & de Ridder, 2006) it was proposed that an incorrect ...Read more
Author:Mathew, Maya J; Dyanti, Nokuzola; Mokhena, Teboho C; Agbakoba, Victor; Sithole, Bishop BDate:Jun 2021This paper deals with the development of cellulose nanofibres (CNFs) reinforced biopolymers for use in packaging applications. Cellulose nanofibres were extracted from sawdust by a combination of chemical and mechanical treatments. The extracted ...Read more
Author:Katata, L; Tshweu, L; Naidoo, Saloshnee; Kalombo, Lonji; Swai, HDate:Oct 2012Efavirenz (EFV) is one of the first-line antiretroviral drugs recommended by the World Health Organisation for treating HIV. It is a hydrophobic drug that suffers from low aqueous solubility (4 lg/mL), which leads to a limited oral absorption ...Read more
Author:Xungu, Sipho; Mgangira, Martin B; Giani, John CDate:Nov 2021This paper describes the design and manufacturing of a mechanical system, the Aggregate Abrasion Test Device (AATD), which comprises of a rolling model drum, with the purpose of obtaining experimental data that is subsequently used to quantify ...Read more
Author:Forbes, A; Botha, LR; Du Preez, N; Drake, TEDate:Jul 2006Laser ultrasonic is currently the optimal method for non-destructive testing of composite materials in the aerospace industry. The process is based on a laser-generated, ultrasound wave which propagates inside the composite. The response at ...Read more
Author:Olivier, K; Cilliers, Jacques E; Du Plessis, MDate:Jul 2011The test and evaluation of modem radars using hardware in the loop simulators requires the use of wideband high-fidelity, digital radio frequency memories (DRFM) in order to generate realistic target retums. Important aspects of wideband DRFM ...Read more
Author:Oyesola, M; Mpofu, K; Daniyan, I; Mathe, Ntombizodwa RDate:Dec 2022In evaluating emerging technology, such as additive manufacturing, it is important to analyse the impact of the manufacturing process on efficiency in an objective and quantifiable manner. This study deals with the design and simulation of a ...Read more
Author:Seid, ER; Majozi, TDate:Oct 2013The increasing interest in multipurpose batch plants is evident, because of their inherent flexibility to cope with an ever changing market environment. These plants are easily reconfigured for product modifications, to cover a wide range of ...Read more