Author:Gbadeyan, OJ; Adali, S; Bright, G; Sithole, Bishop B; Onwubu, SDate:Jul 2020The possibility of obtaining calcium carbonate nanoparticles from Achatina fulica shell through mechanochemical synthesis to be used as a modifying filler for polymer materials has been studied. The process of obtaining calcium carbonate ...Read more
Author:Bergh, J; Snedden, Glen; Dunn, DwainDate:Apr 2020This paper presents the predicted, as well as final experimental results for the design of an automatically optimized non-axisymmetric endwall and as such, attempts to close the loop between design and practice, providing additional information ...Read more
Author:Moolman, FS; Rolfes, H; Van der Merwe, SW; Focke, WWDate:29 Jul 2004The oxygen carrying performance of a perfluorooctyl bromide (PFOB) emulsion is considered. The intended purpose is to enhance hepatocyte growth and function in a bio-artificial liver support system (BALSS). Such oxygen carrying emulsions have ...Read more
Author:Jacobs, V; Patanaik, A; Anandjiwala, RDDate:Nov 2011This paper reports the optimization of electrospinning process and solution parameters using factorial design approach to obtain uniform polyethylene oxide (PEO) nanofibers. The parameters studied were distance between nozzle and collector ...Read more
Author:Menya, E; Olupot, PW; Storz, H; Lubwama, M; Kiros, Y; John, Maya JDate:Mar 2019Response surface methodology was employed to optimize pyrolysis conditions for production of char with maximum yield, fixed carbon content, and with minimum ash content from Uganda’s New Rice for Africa (NERICA) 1 rice husk variety. The aim ...Read more
Author:Pelders, Jodi L; Magweregwede, Fleckson; Rupprecht, SMDate:Aug 2021Increased depths of conventional gold and platinum mines, longer travelling times as working places move further from the shaft, and ancillary activities taking place in the mining cycle reduce the useable time spent at the workface. Current ...Read more
Author:Dada, M; Popoola, P; Aramide, O; Mathe, Ntombizodwa R; Pityana, Sisa LDate:Jun 2020Laser Additive Manufacturing was used to fabricate AlTiCrFeCoNi high entropy alloy and the corrosion properties of the alloy were investigated in 3.5 wt% NaCl solution. The tests were conducted via potentiodynamic polarization at room temperature ...Read more
Author:Adetunji, KE; Hofsajer, IW; Abu-Mahfouz, Adnan MI; Cheng, LDate:Sep 2022In developing a sustainable and efficient power systems network while reducing carbon footprint, renewable energy (RE)-based Distribution Generation (DG) units are highly recommended. Furthermore, Battery Energy Storage Systems (BESS) and ...Read more
Author:Venkatasamy, V; Mathe, Mahlanyane K; Cox, SM; Happek, U; Stickney, JLDate:Jun 2006Studies of the optimization of HgSe thin film deposition using electrochemical atomic layer epitaxy (EC-ALE) are reported. Cyclic voltammetry was used to obtain approximate deposition potentials for each element. These potentials were then ...Read more
Author:Mwakikunga, Bonex W; Forbes, A; Sideras-Haddad, E; Arendse, CDate:Oct 2008Laser pyrolysis has been used to synthesize WO3 nanostructures. Spherical nano-particles were obtained when acetylene was used to carry the precursor droplet, whereas thin films were obtained at high flow-rates of oxygen carrier gas. In both ...Read more
Author:Smith, Marie E; Robertson, lain L; Bernard, StewartDate:Jun 2018Productive upwelling zones such as the southern Benguela can exhibit phytoplankton biomass variability over several orders of magnitude, from near oligotrophic offshore waters to hypertrophic inshore blooms of>100 mgm (sup-3). This introduces ...Read more
Author:Thomalla, Sandy J; Moutier, William; Ryan-Keogh, Thomas J; Gregor, Luke; Schutt, JuliaDate:Dec 2017Autonomous platforms will begin to address the space-time gaps required to improve estimates of phytoplankton distribution, which will aid in the quantification of baseline conditions necessary to detect long-term trends that can be attributed ...Read more
Author:Stamp, J; Majozi, TDate:2011Heat integration to minimise energy usage in multipurpose batch plants has been in published literature for more than two decades. In most present methods, time is fixed a priori through a known schedule, which leads to suboptimal results. ...Read more
Author:Romero, J; Giovannini, D; McLaren, MG; Galvez, EJ; Forbes, A; Padgett, MJDate:Aug 2012We report orbital angular momentum (OAM) and angle correlations between signal and idler photons observed when the nonlinear crystal used in spontaneous parametric down-conversion is illuminated by a non-fundamental Gaussian pump beam. We ...Read more
Author:Patridge, TC; Demenocal, PB; Lorentz, SA; Paiker, MJ; Vogel, JCDate:1997Late Pleistocene variations in rainfall in subtropical Southern Africa are estimated from sediments preserved in the Pretoria saltpan, a 200,000 year-old closed-basin crater lake on the interior plateau of South Africa. This record is one of ...Read more
Author:Hamadou Ibrahim, A; Roux, FS; McLaren, M; Konrad, T; Forbes, ADate:Jun 2013The turbulence-induced decay of orbital-angular-momentum (OAM) entanglement between two photons is investigated numerically and experimentally. To compare our resultswith previouswork,we simulate the turbulent atmosphere with a single phase ...Read more
Author:Barnhoorn, IEJ; Van Dyk, JC; Genthe, Bettina; Harding, WR; Wagenaar, GM; Bornman, MSDate:Feb 2014There are increasing concerns regarding the safe human consumption of fish from polluted, freshwater impoundments. The aim of this study was to analyse the muscle tissue of the sharptooth catfish Clarias gariepinus for selected organo-chlorine ...Read more
Author:John, J; Oosthuizen, R; Webb, E; Voyi, K; Ijsselmuiden, CDate:Mar 2004The authors characterized the exposure of 5-year-old pre-school children, in two areas of Pretoria, to lead in air and surface soil. The study was conducted at 30 pre-schools in Soshanguve and 24 in Pretoria East during July 2001. Exposure ...Read more
Author:Berglund, Martin; Drewes, F; Van der Merwe, BDate:Apr 2018The output size problem, for a string-to-tree transducer, is to determine the asymptotic behavior of the function describing the maximum size of output trees, with respect to the length of input strings. We show that the problem to determine, ...Read more