Recent Submissions

  • Which strategy saves the most energy for stratified water heaters? 

    Ritchie, Michael J.; Engelbrecht, Jacobus A. A.; Booysen, M. J. (Thinus) (MDPI, 2021)
    ENGLISH ABSTRACT: The operation of water heating uses a substantial amount of energy and is responsible for 30% of a household’s overall electricity consumption. Determining methods of reducing energy demand is crucial ...
  • Wind resource clustering based on statistical Weibull characteristics 

    Janse van Vuuren, Chantelle Y.; Vermeulen, Hendrik J. (Multi-Science Publishing, 2019)
    ENGLISH ABSTRACT: This investigation presents results for the clustering of wind resource data based on statistical Weibull characteristics. The clustering of a chosen geographical area is based on the Weibull and mean ...
  • Evaluation of next-generation low-power communication technology to replace GSM in IoT-applications 

    Durand, Thomas G.; Visagie, Lourens; Booysen, Marthinus J. (Institution of Engineering and Technology, 2019)
    ENGLISH ABSTRACT: The large demand for smart metering and control, asset tracking, remote monitoring, and other applications has resulted in the emergence of innovative new internet of things (IoT) low-power wide-area ...
  • Non-destructive measurement of internal quality of apple fruit by a contactless NIR spectrometer with genetic algorithm model optimization 

    Nturambirwe, Jean Frederic Isingizwe; Nieuwoudt, Helene H.; Perold, Willem J.; Opara, Umezuruike Linus (Elsevier, 2019)
    ENGLISH ABSTRACT: Spectrometric methods based on near infrared radiation (NIR) are commonly used effectively in the agricultural and food industry. However, these methods still face limitations whereby meeting requirements ...
  • Classified atmospheric states as operating scenarios in probabilistic power flow analysis for networks with high levels of wind power 

    Dalton, Amaris; Bekker, Bernard; Koivisto, Matti Juhani (Elsevier, 2021)
    ENGLISH ABSTRACT: Large-scale atmospheric circulation patterns are the primary drivers of wind power variability on power networks at timescales of hours to days. This paper proposes a methodology that allows power system ...
  • Analytical modeling of surface-mounted and consequent-pole linear vernier hybrid machines 

    Botha, Christoff D.; Kamper, Maarten J.; Wang, Rong-Jie; Chama, Abdoulkadri (Institute of Electrical and Electronics Engineers, 2021)
    ENGLISH ABSTRACT: This paper presents an analytical method for modeling the no-load air gap ux density of a surface-mounted and a consequent-pole linear Vernier hybrid machine (LVHM). The approach is based on simple ...
  • Wind generator impedance matching in small-scale passive wind energy systems 

    Labuschagne, Casper J. J.; Kamper, Maarten J. (Institute of Electrical and Electronics Engineers, 2021)
    ENGLISH ABSTRACT: In this paper, the improved turbine power matching of passive wind energy systems for dcconnected battery storage applications with an impedance matching method is investigated. The passive system uses ...
  • Mitochondrial event localiser (MEL) to quantitativelydescribe fission, fusion and depolarisation in the three-dimensional space 

    Theart, Rensu P.; Kriel, Jurgen; Du Toit, Andre; Loos, Ben; Niesler, Thomas R. (Public Library of Science, 2020-12)
    ENGLISH ABSTRACT: Mitochondrial fission and fusion play an important role not only in maintaining mitochondrial homeostasis but also in preserving overall cellular viability. However, quantitative analysis based on the ...
  • Cross-coupling inductance parameter estimation for more accurate performance evaluation of wound-field flux modulation machines 

    Mabhula, Mkhululi; Akuru, Udochukwu B.; Kamper, Maarten J. (MDPI, 2020-10-22)
    ENGLISH ABSTRACT: In this paper, a proposed numerical frozen permeability modeling procedure is fully derived to accurately estimate the parameters of two variants of wound-field flux modulation machines (WF-FMMs) namely: ...
  • Review of automatic detection and classification techniques for cetacean vocalization 

    Usman, Ayinde M.; Ogundile, Olayinka O.; Versfeld, Daniel J. J. (Institute of Electrical and Electronics Engineers, 2020-06-03)
    ENGLISH ABSTRACT: Cetaceans have elicited the attention of researchers in recent decades due to their importance to the ecosystem and their economic values. They use sound for communication, echolocation and other social ...
  • 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 ...

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