Recent Submissions

  • Afrikaans and Dutch as closely-related languages : a comparison to West Germanic languages and Dutch dialects 

    Heeringa, Wilbert; De Wet, Febe; Van Huyssteen, Gerhard B. (University of Stellenbosch, Department of General Linguistics, 2015)
    Following Den Besten’s (2009) desiderata for historical linguistics of Afrikaans, this article aims to contribute some modern evidence to the debate regarding the founding dialects of Afrikaans. From an applied perspective ...
  • Regression adjusted colocalisation colour mapping (RACC) : a novel biological visual analysis method for qualitative colocalisation analysis of 3D fluorescence micrographs 

    Theart, Rensu P.; Loos, Ben; Niesler, Thomas R. (Public Library of Science, 2019-11-11)
    ENGLISH ABSTRACT: The qualitative analysis of colocalisation in fluorescence microscopy is of critical importance to the understanding of biological processes and cellular function. However, the degree of accuracy achieved ...
  • Analysis of template-based detection algorithms for inshore Bryde’s whale short pulse calls 

    Ogundile, Olayinka O.; Versfeld, Daniel J. J. (Institute of Electrical and Electronics Engineers, 2020)
    Marine mammals use sound for communication and echolocation within their ecosystems. The detection of these sounds is an important aspect of signal processing, such that we can estimate the spatial position and direction ...
  • Review of channel estimation for candidate waveforms of next generation networks 

    Ijiga, Owoicho E.; Ogundile, Olayinka O.; Familua, Ayokunle D.; Versfeld, Daniel J. J. (MDPI, 2019)
    ENGLISH ABSTRACT: The advancement in wireless communication applications encourages the use of effective and efficient channel estimation (CE) techniques because of the varying behaviour of the Rayleigh fading channel. In ...
  • Revival of the magnetar PSR J1622–4950 : observations with MeerKAT, Parkes, XMM-Newton, Swift, Chandra, and NuSTAR 

    Camilo, F.; Serylak, M.; Buchner, S.; Merryfield, M.; Kaspi, V. M.; Archibald, R. F.; Bailes, M.; Jameson, A.; Van Straten, W.; Sarkissian, J.; Reynolds, J. E.; Johnston, S.; Hobbs, G.; Abbott, T. D.; Adam, R. M.; Adams, G. B.; Alberts, T.; Andreas, R.; Asad, K. M. B.; Baker, D. E.; Baloyi, T.; Bauermeister, E. F.; Baxana, T.; Bennett, T. G. H.; Bernardi, G.; Booisen, D.; Booth, R. S.; Botha, D. H.; Boyana, L.; Brederode, L. R. S.; Burge, J. P.; Cheetham, T.; Conradie, J.; Conradie, J. P.; Davidson, D. B.; De Bruin, G.; De Swardt, B.; De Villiers, C.; De Villiers, D. I. L.; De Villiers, M. S.; De Villiers, W.; De Waal, C.; Dikgale, M. A.; Du Toit, G.; Du Toit, L. J.; Esterhuyse, S. W. P.; Fanaroff, B.; Fataar, S.; Foley, A. R.; Foste, G.; Fourie, D.; Gamatham, R.; Gatsi, T.; Geschke, R.; Goedhart, S.; Grobler, T. L.; Gumede, S. C.; Hlakola, M. J.; Hokwana, A.; Hoorn, D. H.; Horn, D.; Horrell, J.; Hugo, B.; Isaacson, A.; Jacobs, O.; Jansen Van Rensburg, J. P.; Jonas, J. L.; Jordaan, B.; Joubert, A.; Joubert, F.; Jozsa, G. I. G.; Julie, R.; Julius, C. C.; Kapp, F.; Karastergiou, A.; Karels, F.; Kariseb, M.; Karuppusamy, R.; Kasper, V.; Knox-Davies, E. C.; Koch, D.; Kotze, P. P. A.; Krebs, A.; Kriek, N.; Kriel, H.; Kusel, T.; Lamoor, S.; Lehmensiek, R.; Liebenberg, D.; Liebenberg, I.; Lord, R. T.; Lunsky, B.; Mabombo, N.; Macdonald, T.; Macfarlane, P.; Madisa, K.; Mafhungo, L.; Magnus, L. G.; Magozore, C.; Mahgoub, O.; Main, J. P. L.; Makhathini, S.; Malan, J. A.; Malgas, P.; Manley, J. R.; Manzini, M.; Marais, L.; Marais, N.; Marais, S. J.; Maree, M.; Martens, A.; Matshawule, S. D.; Matthysen, N.; Mauch, T.; McNally, L. D.; Merry, B.; Millenaar, R. P.; Mjikelo, C.; Mkhabela, N.; Mnyandu, N.; Moeng, I. T.; Mokone, O. J.; Monama, T. E.; Montshiwa, K.; Moss, V.; Mphego, M.; New, W.; Ngcebetsha, B.; Ngoasheng, K.; Niehaus, H.; Ntuli, P.; Nzama, A.; Obies, F.; Obrocka, M.; Ockards, M. T.; Olyn, C.; Oozeer, N.; Otto, A. J.; Padayachee, Y.; Passmoor, S.; Patel, A. A.; Paula, S.; Peens-Hough, A.; Pholoholo, B.; Prozesky, P.; Rakoma, S.; Ramaila, A. J. T.; Rammala, I.; Ramudzuli, Z. R.; Rasivhaga, M.; Ratcliffe, S.; Reader, H. C.; Renil, R.; Richter, L.; Robyntjies, A.; Rosekrans, D.; Rust, A.; Salie, S.; Sambu, N.; Schollar, C. T. G.; Schwardt, L.; Seranyane, S.; Sethosa, G.; Sharpe, C.; Siebrits, R.; Sirothia, S. K.; Slabber, M. J.; Smirnov, O.; Smith, S.; Sofeya, L.; Songqumase, N.; Spann, R.; Stappers, B.; Steyn, D.; Steyn, T. J.; Strong, R.; Struthers, A.; Struthers, A.; Stuart, C.; Sunnylall, P.; Swart, P. S.; Taljaard, B.; Tasse, C.; Taylor, G.; Theron, I. P.; Thondikulam, V.; Thorat, K.; Tiplady, A.; Toruvanda, O.; Van Aardt, J.; Van Balla, T.; Van den Heever, L.; Van der Byl, A.; Van der Merwe, C.; Van der Merwe, P.; Van Niekerk, P. C.; Van Rooyen, R.; Van Staden, J. P.; Van Tonder, V.; Van Wyk, R.; Wait, I.; Walker, A. L.; Wallace, B.; Welz, M.; Williams, L. P.; Xaia, B.; Young, N.; Zitha, S. (American Astronomical Society, 2018)
    New radio (MeerKAT and Parkes) and X-ray (XMM-Newton, Swift, Chandra, and NuSTAR) observations of PSR J1622–4950 indicate that the magnetar, in a quiescent state since at least early 2015, reactivated between 2017 March ...
  • Feature trajectory dynamic time warping for clustering of speech segments 

    Lerato, Lerato; Niesle, Thomas (SpringerOpen, 2019)
    ENGLISH ABSTRACT: Dynamic time warping (DTW) can be used to compute the similarity between two sequences of generally differinglength. We propose a modification to DTW that performs individual and independent pairwise ...
  • Reconsidering the advantages of the three-dimensional representation of the interferometric transform for imaging with non-coplanar baselines and wide fields of view 

    Smith, D. M. P.; Young, A.; Davidson, D. B. (EDP Sciences, 2017)
    Radio telescopes with baselines that span thousands of kilometres and with fields of view that span tens of degrees have been recently deployed, such as the Low Frequency Array, and are currently being developed, such as ...
  • Temporal case study of household behavioural response to Cape Town's Day Zero using smart meter data 

    Booysen, M. J.; Visser, M.; Burger, R. (Elsevier, 2018-11-13)
    ENGLISH ABSTRACT: Faced with the threat of "Day Zero", when it was feared that Cape Town's taps could run dry, consumers reduced household water usage from 540 to 280 litres per household per day over the 36 months ...
  • Biosensors for the detection of Escherichia coli 

    Maas, M. B.; Perold, W. J.; Dicks, L. M. T. (South African Water Research Commission, 2017-10)
    ENGLISH ABSTRACT: The supply of safe potable water, free from pathogens and chemicals, requires routine analyses and the application of several diagnostic techniques. Apart from being expensive, many of the detection methods ...
  • Improved region of interest selection and colocalization analysis in three-dimensional fluorescence microscopy samples using virtual reality 

    Theart, Rensu P.; Loos, Ben; Powrie, Yigael S. L.; Niesler, Thomas R. (Public Library of Science, 2018)
    Although modern fluorescence microscopy produces detailed three-dimensional (3D) datasets, colocalization analysis and region of interest (ROI) selection is most commonly performed two-dimensionally (2D) using maximum ...
  • Animal-borne behaviour classification for sheep (Dohne Merino) and rhinoceros (Ceratotherium simum and diceros bicornis) 

    Le Roux, Solomon Petrus; Marias, Jacques; Wolhuter, Riaan; Niesler, Thomas (BioMed Central, 2017-11-21)
    Background: The ability to study animal behaviour is important in many fields of science, including biology, behavioural ecology and conservation. Behavioural information is usually obtained by attaching an electronic ...
  • A comparative evaluation of the impact of average speed enforcement (ASE) on passenger and minibus taxi vehicle drivers on the R61 in South Africa 

    Akoku Ebot Eno Akpa, Nelson; Booysen, M. J.; Sinclair, M. (South African Institution of Civil Engineering, 2016)
    Average speed enforcement (ASE) is an emergent alternative to instantaneous speed limit enforcement to improve road safety, and is used to enforce an average speed limit over a road segment. This paper presents a study on ...
  • Multivariate adaptive sampling of parameterized antenna responses 

    Mutonkole, Ngoy; De Villiers, Dirk I. L. (Institute of Electrical and Electronics Engineers, 2017)
    ENGLISH ABSTRACT: We present a robust method to adaptively construct parameterized models of the full radiation patterns of antennas and the associated S-parameters. The method sequentially selects points (geometric ...
  • Virtual reality assisted microscopy data visualization and colocalization analysis 

    Theart, Rensu P.; Loos, Ben; Niesler, Thomas R. (BioMed Central, 2017-02-15)
    Background: Confocal microscopes deliver detailed three-dimensional data and are instrumental in biological analysis and research. Usually, this three-dimensional data is rendered as a projection onto a two-dimensional ...
  • An efficient beam steerable antenna array concept for airborne applications 

    Aliakbarian, Hadi; Van der Westhuizen, Ewald; Wiid, Riaan; Volskiy, Vladimir; Wolhuter, Riaan; Vandenbosch, Guy A. E. (Radioengineering Society, 2014)
    Deployment of a satellite borne, steerable antenna array with higher directivity and gain in Low Earth Orbit makes sense to reduce ground station complexity and cost, while still maintaining a reasonable link budget. The ...
  • Ripple compensation for a class-D amplifier 

    Cox, Stephen M.; Mouton, H. du Toit (Society for Industrial and Applied Mathematics, 2015)
    ENGLISH ABSTRACT: This paper presents the first detailed mathematical analysis of the ripple compensation technique for reducing audio distortion in a class-D amplifier with negative feedback. The amplifier converts a ...
  • Clustering acoustic segments using multi- stage agglomerative hierarchical clustering 

    Lerato, Lerato; Niesler, Thomas (Public Library of Science, 2015)
    Agglomerative hierarchical clustering becomes infeasible when applied to large datasets due to its O(N2) storage requirements. We present a multi-stage agglomerative hierarchical clustering (MAHC) approach aimed at large ...
  • Compact conical line power combiner design using circuit models 

    Beyers, Ryno D.; De Villiers, Dirk I. L. (Institute of Electrical and Electronics Engineers, 2014)
    ENGLISH ABSTRACT: A simple equivalent circuit model with empirical equations describing the peripheral feeding ports of conical line power combiners is presented. The model allows the entire structure to be designed using ...
  • Fast parametric modeling of radio astronomy reflector antenna noise temperature 

    De Villiers, Dirk I. L. (Institute of Electrical and Electronics Engineers, 2016)
    This communication presents an approximate method to rapidly estimate the antenna noise temperature of a reflector antenna system as a function of the geometric parameters describing the reflector dishes. The initial ...
  • Constant radiation characteristics for log-periodic dipole array antennas 

    Lehmensiek, Robert; De Villiers, Dirk I. L. (Institute of Electrical and Electronics Engineers, 2014)
    Given the correct terminal voltages on each element of a log-periodic dipole array constant radiation characteristics can be achieved for an omni-directional radiation pattern. In this communication it is shown that this ...

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