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:May 2012Most 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: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:Mafusire, C; Forbes, ADate:Jul 2011The authors outline a theory for the calculation of the beam quality factor of an aberrated laser beam. They provide closed form equations that show that the beam quality factor of an aberrated Gaussian beam depends on all primary aberrations ...Read more
Author:Onumanyi, Adeiza J; Abu-Mahfouz, Adnan MI; Hancke, GPDate:Jan 2021Parameter-based adaptive threshold estimators (ATEs) are widely used for signal detection in cognitive radio (CR) systems. However, their performance deteriorates under dynamic spectra conditions owing to a lack of valid methods to accurately ...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:Dudley, Angela L; Li, Y; Mhlanga, T; Escuti, M; Forbes, ADate:Sep 2013Nondiffracting vector Bessel beams are of considerable interest due to their nondiffracting nature and unique high-numerical-aperture focusing properties. Here we demonstrate their creation by a simple procedure requiring only a spatial light ...Read more
Author:Harmse, H; Britz, K; Gerber, ADate:Oct 2018A challenge in ontology engineering is the mismatch in expertise between the ontology engineer and domain expert, which often leads to important constraints not being specified. Domain experts often only focus on specifying constraints that ...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:Alexander, B; Bollinger, JJ; Uys, HermannDate:Jun 2020Many quantum state preparation methods rely on a combination of dissipative quantum state initialization followed by unitary evolution to a desired target state. Here we demonstrate the usefulness of quantum measurement as an additional tool ...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:Sayle, TXT; Catlow, CRA; Maphanga, RR; Ngoepe, PE; Sayle, DCDate:21 Sep 2005Models of MnO2 nanoparticles, with full atomistic detail, have been generated using a simulated amorphization and recrystallization strategy. In particular, a 25,000-atom "cube" of MnO2 was amorphized (tension-induced) under molecular dynamics ...Read more