Author:Rossouw, M; Terblanche, L; Moes, JDate:Sep 2013Long-period waves are almost invisible waves due to the long wave-lengths of several hundreds of metres and heights of only decimetres. The effect of these long waves can, however, be devastating in the form of harbour basin oscillations and ...Read more
Author:Smith, Andrew C; Kotzé, Paula; Gelderblom, HDate:Sep 2011The authors discuss the application of the 'general design methodology‘ in the context of a physical computing project. The aim of the project was to design and develop physical objects that could serve as metaphors for computer programming ...Read more
Author:Booth, R; Meyer, T; Sombattheera, CDate:Jul 2009Most belief change operators in the AGM tradition assume an underlying plausibility ordering over the possible worlds which is transitive and complete. A unifying structure for these operators, based on supplementing the plausibility ordering ...Read more
Author:Booth, R; Meyer, T; Sombattheera, CDate:Sep 2009Most belief change operators in the AGM tradition assume an underlying plausibility ordering over the possible worlds which is transitive and complete. A unifying structure for these operators, based on supplementing the plausibility ordering ...Read more
Author:Shatalov, MYDate:May 2008A general model of operation of vibratory gyroscopes, which is applicable to a broad class of instruments, including cylindrical, disc and micro-machined gyros, is formulated on the basis of analysis of dynamics and control of a hemispherical ...Read more
Author:Louw, A; Davel, M; Barnard, EDate:Jul 2005A general-purpose isiZulu text-to-speech (TTS) system was developed, based on the “Multisyn” unit-selection approach supported by the Festival TTS toolkit. The development involved a number of challenges related to the interface between speech ...Read more
Author:Claassens, J; Demiris, YDate:Sep 2011This paper concerns modelling human hand or tool trajectories when interacting with everyday objects. In these interactions symmetries may be exhibited in portions of the trajectories which can be used to identify task space redundancy. This ...Read more
Author:Makitla, I; Mtsweni, Jabu SDate:Dec 2015In this paper, we describe the development of a generalized metric for computing response time of a web service. Such a generalized metric would help to develop consensus with regards to the meanings of contracted Quality of Service (QoS) ...Read more
Author:Van Deventer, HeidiDate:Aug 2010The construction of linear developments, such as roads, railways, pipelines and power lines, in South Africa requires a number of alternatives to be considered prior to the submission of a proposed development for an Environmental Impact ...Read more
Author:Li, Y; Dudley, Angela L; Mhlanga, T; Escutia, MJ; Forbes, ADate:Aug 2013We experimentally generate non-diffracting vector vortex beams by using a Spatial Light Modulator (SLM) and an azimuthal birefringent plate (q-plate). The SLM generates scalar Bessel beams and the q-plate converts them to vector vortex beams. ...Read more
Author:Dudley, Angela L; Lib, Y; Mhlanga, T; Escuti, M; Forbes, ADate:Mar 2014We demonstrate how to create non-diffracting vector Bessel beams by implementing a spatial light modulator (SLM) to generate scalar Bessel beams which are then converted into vector fields by the use of an azimuthally-varying birefringent ...Read more
Author:Carter, WS; Zunckel, M; Diab, RDate:Oct 2008Biomass burning is a source category that is often ignored in pollution dispersion modelling simulations. This study presents a unique contribution to the quantification of emissions from biomass burning for high resolution modelling. Previous ...Read more
Author:Bell, Teboho; Ngcobo, Sandile; Haddadi, S; Ait-Ameur, K; Forbes, ADate:Jul 2015Using the digital laser one can generate various types of modes, like, Laguerre-Gaussian modes. The digital laser was forced to generate high-order radial Laguerre-Gaussian modes, LGp , with zero azimuthal order, by loading a digital hologram ...Read more
Author:Botha, N; Botha, L; Du Plessis, A; Schwoerer, HDate:31 Aug 2010Femtosecond pulse shaping can be done by different kinds of pulse shapers, such as liquid crystal spatial light modulators (LC SLM), acousto optic modulators (AOM) and deformable and movable mirrors. A few applications where pulse shaping is ...Read more
Author:Vasilyeu, R; Dudley, Angela L; Khilo, N; Forbes, ADate:Oct 2009An experimental setup to generate a superposition of higher-order Bessel beams by means of a spatial light modulator and ring aperture is presented. The experimentally produced fields are in good agreement with those calculated theoretically.Read more
Author:Forbes, A; Du Preez, N; Litvin, IA; Botha, LRDate:Jul 2009Generation and application of high power flattened Gaussian beams. Presented at the 54th Annual Conference of the South African Institute of Physics (SAIP) 2009.Read more
Author:Belyi, VN; Khilo, NA; Forbes, A; Ryzhevich, AADate:Aug 2009Linear and nonlinear processes of transferring optical singularities from anisotropic crystals onto the wavefront of Bessel light beams (BLBs) are investigated. The generation of high-order vortices at the propagation of BLBs along the optical ...Read more
Author:Hendriks, A; Naidoo, Darryl; Roux, FS; Löpez-Mariscal, C; Forbes, ADate:Aug 2012Phase-only spatial light modulators are now ubiquitous tools in modern optics laboratories, and are often used to generate so-called structured light. In this work we outline the use of a phase-only spatial light modulator to achieve full ...Read more
Author:Ngcobo, Sandile; Ait-Ameur, K; Forbes, ADate:Jul 2012This 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 geometry is in ...Read more
Author:Bell, Teboho; Forbes, A; Ngcobo, SandileDate:Oct 2015The solid state digital laser was used in generation of Laguerre-Gaussian modes, LGpl, of different orders. This work demonstrates that we can generate high-order Laguerre-Gaussian modes with high purity using a digital laser.Read more