Author:Katumba, G; Makiwa, G; Olumekor, L; Forbes, ADate:Jan 2008It is possible to design an optical material, through control of the substrate and coatings, to absorb a large fraction of the solar spectrum and to emit very little radiation energy in the near and far infra-red wavelength range. This requires ...Read more
Author:Wright, C; Albers, PDate:Sep 2011While some sun exposure induces a sense of well-being and synthesis of vitamin D excess sun exposure has been associated with skin cancer, immune suppression and ocular cataracts. In South Africa, approximately 30% of all histologically-diagnosed ...Read more
Author:Wright, CYDate:01 Sep 2010On average, places in South Africa experience between 6 and 12 hours of sunshine per day. Of course, on heavily cloudy and rainy days, less sunshine reaches us, but generally we enjoy a frequent supply of blue skies and bright sun. So, what ...Read more
Author:Wright, GY; Griffith, DDate:Sep 2015Solar ultraviolet radiation (UVR) data for matching time periods between November 2014 and February 2015 were recorded by two instruments, namely a UVR biometer and a Davis UVR sensor, and their data were compared. Several checks and challenges ...Read more
Author:McGuigan, KG; Conroy, RM; Mosler, H-J; Du Preez, M; Ubomba-Jaswa, Eunice; Fernandez-Ibanez, PDate:Oct 2012Solar water disinfection (SODIS) has been known for more than 30 years. The technique consists of placing water into transparent plastic or glass containers (normally 2 L PET beverage bottles) which are then exposed to the sun. Exposure times ...Read more
Author:White, D; Taverner, BC; Coville, NJ; Wade, PWDate:14 Jun 1995The values of the solid angles Omega for a range of commonly encountered ligands in organometallic chemistry (phosphines, phosphites, amines, arsines and cyclopentadienyl rings) have been determined. The solid angles were derived from a single ...Read more
Author:Mo, L; Zheng, HaitaoDate:Nov 2020In generally, the thermal behaviour of cathode and electrolyte are the major concerns for the safety of lithium-ion battery, In contrast to rare attention on thermal effects of anode materials. In this work, Li4Ti5O12/polyaniline (PANI@LTO) ...Read more
Author:Mo, L; Zheng, HaitaoDate:Nov 2020In generally, the thermal behaviour of cathode and electrolyte are the major concerns for the safety of lithium-ion battery, In contrast to rare attention on thermal effects of anode materials. In this work, Li4Ti5O12/polyaniline (PANI@LTO) ...Read more
Author:Noble, RGDate:Jun 1976The importance of solid wastes management in environmental pollution control cannot be over-emphasised. Increased socio-economic development in South Africa has brought with it increasing volumes of urban, industrial and agricultural wastes, ...Read more
Author:Sha, G; Moller, H; Stumpf, WE; Xia, JH; Govender, G; Ringer, SPDate:Jan 2012The solute nanostructures formed in the primary a-Al grains of a semi-solid metal cast Al–7Si–0.6Mg alloy (F357) during ageing at 180°C, and the age-hardening response of the alloy, have been systematically investigated by transmission electron ...Read more
Author:Lebelo, RS; Fedotov, I; Shatalov, MDate:Sep 2008In this paper, the method of approximating solutions of partial differential equations with variable coefficients is studied. This is done by considering heat flow through a one-dimensional model with variable cross-sections. Two cases are ...Read more
Author:McDonald, Andre M; Van Wyk, MDate:Aug 2017A novel solution of the inverse Frobenius–Perron problem for constructing semi–Markov chaotic maps with prescribed statistical properties is presented. The proposed solution uses recursive Markov state disaggregation to construct an ergodic ...Read more
Author:Kebede, Mesfin A; Phasha, MJ; Kunjuzwa, N; Mathe, Mahlanyane K; Ozoemena, KIDate:Jun 2015High-performing (LiAl(subx)Mn(sub2-x)O(sub4) (x = 0, 0.125, 0.25, 0.375, and 0.5) spinel cathode materials for lithium-ion battery were developed using a solution combustion method. The as-synthesized cathode materials have spinel cubic ...Read more
Author:Kebede, Mesfin A; Kunjuzwa, N; Jafta, CJ; Mathe, Mahlanyane K; Ozoemena, KIDate:2014Spherically shaped Ni-substituted LiNi(subx)Mn(sub2-x)O(sub4) (x=0, 0.1, 0.2) spinel cathode materials for lithium ion battery with high first cycle discharge capacity and remarkable cycling performance were synthesized using the solution-combustion ...Read more
Author:Maphoru, MV; Heveling, J; Kesavan Pillai, SreejaraniDate:Aug 2015Using H(sub2)O(sub2) as the oxidant, 1-naphthols with electron-donating groups at the 2- and 4-positions couple oxidatively over a carbon-supported platinum catalyst to 3,3'-substituted 1,1'-binaphthalenylidene-4,4'-diones and 4,4'-substituted ...Read more
Author:Meissner, HD; Mclver, BADate:Aug 1974A method is described for dyeing wool with reactive dyes from perchloroethylene utilizing the solvent soluble complex of the dye and a surface-active agent of opposite charge.Read more
Author:Greeff, M; Engelbrecht, APDate:Jun 2008Many optimisation problems are multi-objective and change dynamically. Many methods use a weighted average approach to the multiple objectives. This paper introduces the usage of the vector evaluated particle swarm optimiser (VEPSO) to solve ...Read more
Author:Bello, O; Abu-Mahfouz, Adnan MI; Haman, Y; Page, Philip R; Adedeji, KB; Piller, ODate:Mar 2019Modern water distribution networks (WDNs) are complex and difficult to manage due to increased level of urbanization, varying consumer demands, ageing infrastructure, operational costs, and inadequate water resources. The management problems ...Read more