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Browsing General science, engineering & technology by Title

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  • Focke, RW; De Villiers, Johan P; Inggs, MR (Elsevier, 2015-05)
    Interval Algebra provides an effective means to schedule surveillance radar networks, as it is a temporal ordering constraint language. Thus it provides a solution to a part of resource management, which is included in the ...
  • Van Niekerk, DR; Barnard, E (INTERSPEECH 2010, 2010-09)
    The authors present an initial investigation into the acoustic realisation of tone in continuous utterances in Sepedi (a language in the Southern Bantu family). An analytic model for the generation of appropriate pitch ...
  • Naidoo, Darryl; Forbes, A; Aït-Ameur, K; Fromager, M (SPIE, 2011-01)
    A method of decomposing a dual-directional laser beam into a forward propagating field and a backward propagating field for an apertured plano-concave cavity is presented. An intra-cavity aperture is a simple method of ...
  • Ngcobo, S; Ait-Ameur, K; Forbes, A (2012-08)
    This work deals with the generation of symmetrical high order Laguerre Gaussian modes. These high order Laguerre-Gaussian beams are generated by forcing the laser using an annular binary Diffractive Optical Element whose ...
  • Naidoo, Darryl; Aït-Ameur, K; Brunel, M; Forbes, A (Springer Verlag, 2012)
    In this paper we demonstrate experimentally the intra-cavity generation of a coherent superposition of Laguerre–Gaussian modes of zero radial order but opposite azimuthal order. The superposition is created with a simple ...
  • Naidoo, Darryl; Litvin, I; Laskin, A; Forbes, A (SPIE Proceedings, 2014-02)
    We explore an intra-cavity beam shaping approach to generate a Gaussian distribution by the metamorphosis of a Gaussian beam into a flat-top distribution on opposing mirrors. The concept is tested external to the cavity ...
  • Naidoo, Darryl; Aït-Ameur, K; Forbes, A (SPIE, 2011-08)
    In this paper the authors explore vortex beams and in particular the generation of single LG0l modes and superpositions thereof. Vortex beams carry orbital angular momentum (OAM) and this intrinsic property makes them ...
  • Litvin, IA; Khilo, NA; Forbes, A; Belyi, VN (Society of Photo-Optical Instrumentation Engineers, 2009-08)
    In this paper the researchers report on two resonator systems for producing LDBLBs with arbitrary initial parameters. First resonator system is based on doublet of divergence and convergence lenses with spherical aberration. ...
  • Litvin, IA; Loveday, PW; Long, CS; Kazak, NS; Belyi, V; Forbes, A (Society of Photo-Optical Instrumentation Engineers (SPIE), 2008-08)
    There are many applications in which a laser beam with a flat–top intensity profile would be ideal, as compared to a laser beam with a non–uniform energy distribution. Standard stable optical resonators will unfortunately ...
  • Mthunzi, P; Lee, WM; Riches, AC; Brown, CTA; Gunn-Moore, FJ; Dholakia, K (IEEE, 2010-05)
    Optical micromanipulation of transparent microparticles such as cellularmaterials relies upon the application of optical forces that are crucially dependent on the refractive index contrast between the particle and the ...
  • Wesley-Smith, J; Berjak, P; Pammenter, NW; Walters, Chavon R (Oxford University Press (OUP), 2014-03)
    Cryopreservation is the only long-term conservation strategy available for germplasm of recalcitrant-seeded species. Efforts to cryopreserve this form of germplasm are hampered by potentially lethal intracellular freezing ...
  • Kwezi, Lusisizwe; Wheeler, JI; Marondedze, C; Gehring, C; Irving, HR (Taylor & Francis, 2018-02)
    Signal modulation is important for the growth and development of plants and this process is mediated by a number of factors including physiological growth regulators and their associated signal transduction pathways. Protein ...
  • Botha, N; Kok, S; Inglis, HM (2012-07)
    Glaucoma is the second leading cause of irreversible blindness. The primary indicator for glaucoma is an elevated intraocular pressure, which is estimated by means of contact or non-contact tonometry. However, these ...
  • Litvin, IA; Forbes, A (Society of Photo-Optical Instrumentation Engineers, 2009-08)
    In this paper the authors present the analytical and numerical analyses of two new resonator systems for generating flat–top–like beams. Both approaches lead to closed form expressions for the required cavity optics, but ...
  • Litvin, IA; Khilo, NA; Forbes, A; Belyi, VN (Optical Society of America, 2010-02)
    The authors report on two resonator systems for producing Bessel–like beams with longitudinally dependent cone angles (LDBLBs). Such beams have extended propagation distances as compared to conventional Bessel– Gauss beams, ...
  • Rens, GB; Varzinczak, IJ (PRASA 2009, 2009-12)
    The authors are developing a new logic (DyMoDeL) for reasoning about dynamic agents with stochastic action, partial observation, knowledge-of and degree-of-belief-in a state of affairs. Development of the syntax and semantics ...
  • Bopape, Mary-Jane M; Engelbrecht, F (South African Society for Atmospheric Sciences, 2011-09)
    A nonhydrostatic sigma coordinate model (NSM) is currently being developed at the Council for Scientific and Industrial Research (CSIR), using the equation set of Engelbrecht et. al. (2007), for purposes of simulating ...
  • Pattinson, T; Majozi, T (Elsevier, 2009)
    A novel operational policy, the Process Intermediate Storage operational policy, is introduced and used to synthesize, schedule and design multipurpose batch plants. The model is based on the State Sequence Network and ...
  • Casini, G; Meyer, T; Moodley, K; Sattler, U; Varzinczak, I (Springer International Publishing, 2015-10)
    In recent years, various approaches have been developed for representing and reasoning with exceptions in OWL. The price one pays for such capabilities, in terms of practical performance, is an important factor that is yet ...
  • Stavropoulos, CC (Cooperative Scientific Programmes: CSIR, 1977-09)
    The telemetering of information over long distances from unattended environmental monitoring equipment at remote sites can be difficult to carry out using conventional high frequency radio communication. This is because ...

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