Author:Du Preez, NC; Forbes, A; Botha, LRDate:Sep 2009In this paper researchers present the design of a CO2 laser resonator that produces as the stable transverse mode a super–Gaussian laser beam. The resonator makes use of an intra–cavity diffractive mirror and a flat output coupler, generating ...Read more
Author:Strauss, Hencharl J; Bollig, C; Botha, RC; Von Bergmann, HM; Burger, JPDate:Jul 2006This presentation aims at the following: to develop new techniques to mount laser crystals; compare the laser properties of two equally doped, high power Nd:YVO4 and Nd: GdVO4 lasers; build a 1um vanadate laser with average output power ...Read more
Author:Abia, ALK; Ubomba-Jaswa, Eunice; Momba, MNBDate:Oct 2015This study aimed at investigating the presence of antibiotic-resistant Escherichia coli in river bed sediments of the Apies River, Gauteng, South Africa, in order to better inform health management decisions designed to protect users of the ...Read more
Author:Khutlang, Rethabile; Khanyile, Nontokozo P; Makinana, Sisanda; Nelwamondo, Fulufhelo VDate:May 2016Biometric fingerprint scanners scan the external skin features onto a 2D image. The performance of the automatic fingerprint identification system suffers if the finger skin is wet, worn out, fake fingerprint is used et cetera. Swept source ...Read more
Author:Malherbe, Johan; Engelbrecht, F; Landman, W; Engelbrecht, CDate:Sep 2011Tropical cyclone landfall within the southwest Indian Ocean (SWIO) basin occurs on average about 3 times per year over Mozambique and Madagascar. Rainfall associated with tropical cyclones over the interior of southern Africa can also cause ...Read more
Author:Mngadi, SB; Durrheim, RJDate:Oct 2013Subsidence and collapse of unmapped shallow coal mine workings poses a risk to the public and hampers the development of valuable property. A high-resolution reflection seismic survey was conducted to determine whether it is possible to map ...Read more
Author:Sharma, AmeethDate:Jul 2016Light based techniques continue to gain momentum in different spheres of diagnostic and therapeutic applications as a result of their non-invasive, noncontact properties. One such technique is Optical Coherence tomography (OCT). Since it was ...Read more
Author:Sharma, Ameeth; Singh, Ann; Roberts, Ted; Ramokolo, Lesiba R; Strauss, Hencharl JDate:Jul 2016Light-based techniques continue to gain momentum in different spheres of diagnostic and therapeutic applications due to their non-invasive, non-contact properties. One such technique is Optical Coherence tomography (OCT). Since first being ...Read more
Author:Klein, Peter; Roos, T; Sheer, JDate:Jan 2014The development of high temperature thermal storage systems is required to increase the solar share of solar-hybrid gas turbine cycles. This paper proposes a pressurised packed bed of Encapsulated Phase Change Materials (EPCM) as a thermal ...Read more
Author:Fouché, Gerda; Senabe, J; Khorombi, E; Kolesnikoya, N; Maharaj, VJ; Nthambeleni, RDate:Nov 2008Plants have a long history of use in the treatment of cancer and over 60% of currently used anti-cancer agents are derived in one way or another from natural sources. South Africa has a rich plant biodiversity with only a limited number ...Read more
Author:Kruger, OADate:2001The most commonly used method in the calibration of step gauges is the coordinate measuring machine (CMM), equipped with a laser interferometer for the highest accuracy. This paper describes a modification to a length-bar measuring machine ...Read more
Author:De Saxe, CC; Van Eeden, J; Kemp, Lana; Steenkamp, Anton J; Cowper, JDate:Jun 2023South Africa's national power utility, Eskom, is under growing pressure to increase its power generation capacity in the face of national rolling blackouts while also containing costs, increasing revenue, and reducing its environmental impact. ...Read more
Author:Kwon, Y-J; Lee, W; Genovesio, A; Emans, NDate:Mar 2012G-protein–coupled receptors (GPCRs) are pivotal in cellular responses to the environment and are common drug targets. Identification of selective small molecules acting on single GPCRs is complicated by the shared machinery coupling signal ...Read more
Author:Lalloo, Rajesh; Maharajh, Dheepak M; Gorgens, J; Gardiner, NS; Gorgens, JFDate:May 2009Previous studies have demonstrated the efficacy of our Bacillus cereus isolate (NRRL 100132) in reducing concentrations of nitrogenous wastes and inhibiting growth of fish pathogens. In vivo efficacy and tolerance to a range of physiological ...Read more
Author:Mabena, Chemist M; Roux, FSDate:Nov 2017A method is proposed to characterize a high-dimensional quantum channel with the aid of classical light. It uses a single nonseparable input optical field that contains correlations between spatial modes and wavelength to determine the effect ...Read more