Author:Saxe, AM; Earle, AC; Rosman, Benjamin SDate:Aug 2017Hierarchical architectures are critical to the scalability of reinforcement learning methods. Most current hierarchical frameworks execute actions serially, with macro-actions comprising sequences of primitive actions. We propose a novel ...Read more
Author:Botha, RC; Koen, W; Esser, MJD; Bollig, C; Combrinck, WL; Von Bergmann, M; Strauss, Hencharl JDate:Feb 2015A 1314 nm two-crystal Nd:YLF laser was designed and operated in both CW and actively Q-switched modes. Maximum CW output of 26.5 W resulted from 125 W of combined incident pump power. Active Q-switching was obtained by inserting a Brewster-cut ...Read more
Author:Kemp, Lana; Steenkamp, Anton J; De Saxe, CCDate:Sep 2021The substantial road maintenance backlog in South Africa, coupled with an inadequate budget allocation, requires high impact solutions in order to preserve the 158 000 km paved road network. Focussing efforts on the heavy vehicles operating ...Read more
Author:McGuigan, KG; Samaiyar, P; Du Preez, M; Conroy, RMDate:Sep 2011Recent solar disinfection (SODIS) studies in Bolivia and South Africa have reported compliance rates below 35% resulting in no overall statistically significant benefit associated with disease rates. In this study, the authors report the ...Read more
Author:McLaren, M; Roux, FS; Forbes, ADate:Jul 2012This presentation highlights the increasing interest in quantum and high dimensional entanglement.Read more
Author:Boguslavsky, LDate:Oct 2010In this work, High Efficiency Particulate Air (HEPA) Filters are designed to keep small harmful particles from entering a control environment or to prevent them from escaping. Nonwoven fabrics for filtration application were produced from ...Read more
Author:Ngcobo, Sandile; Forbes, A; Ait-Ameur, KDate:Jul 2012The transformation of a single mode TEM00 Gaussian beam by forcing the laser to operate into a symmetrical single mode higher order TEMp0 Laguerre Gaussian beam intensity distribution is very useful in improving and substantially increasing ...Read more
Author:Ballav, N; Maity, Arjun; Mishra, SBDate:Aug 2012Glycine doped polypyrrole (PPy-gly) adsorbent was prepared via in situ polymerization of pyrrole (Py) monomer in the presence of glycine (gly) for the removal of Cr(VI). Formation of PPy homopolymer and inclusion of gly in the PPy matrix were ...Read more
Author:Dada, M; Popoola, P; Adeosun, S; Mathe, Ntombizodwa RDate:Sep 2019In the aerospace industry, materials used as modern engine components must be able to withstand extreme operating temperatures, creep, fatigue crack growth and translational movements of parts at high speed. Therefore, the parts produced must ...Read more
Author:Dada, M; Popoola, P; Adeosun, S; Mathe, Ntombizodwa RDate:Sep 2019In the aerospace industry, materials used as modern engine components must be able to withstand extreme operating temperatures, creep, fatigue crack growth and translational movements of parts at high speed. Therefore, the parts produced must ...Read more
Author:Robinson, CM; Huot, Y; Schuback, N; Ryan-Keogh, Thomas J; Thomalla, Sandy J; Antoine, DDate:Jul 2021Studying the biogeochemistry of the Southern Ocean using remote sensing relies on accurate interpretation of ocean colour through bio-optical and biogeochemical relationships between quantities and properties of interest. During the Antarctic ...Read more
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