Browsing Faculty of Science by Title

Now showing items 1531-1550 of 1558

  • Vacuum polarisation energies of two interacting scalar fields with a mass gap in (1 + 1) dimensions 

    Capraro, Martin Horst (Stellenbosch : Stellenbosch University, 2014-12)
    ENGLISH ABSTRACT: The tools of perturbative Quantum Field Theory are by now a standard part of the theoretical physicist's arsenal. In this thesis we investigate the spectral method, an approach that uses tools from the ...

  • Vacuum ultraviolet laser spectroscopy of CO molecules in a supersonic jet 

    Steinmann, C. M. (Christine Margarete) (Stellenbosch : Stellenbosch University, 2003-12)
    ENGLISH ABSTRACT: A tunable narrow-bandwidth laser source combined with a supersonic gas jet as sample is wellsuited for obtaining high-resolution spectra of cold isolated molecules and complexes. In the present study ...

  • Variability among individuals and populations : implications for arthropod physiology 

    Terblanche, Jonathan Steed (Stellenbosch : Stellenbosch University, 2006-04)
    ENGLISH ABSTRACT: Within arthropods, inter-individual and inter-population variation is generally poorly explored for physiological parameters. Such physiological variability is important, as it can provide insight into the ...

  • The variability of autophagy and cell death susceptibility : unanswered questions 

    Loos, Ben; Engelbrecht, Anna-Mart; Lockshin, Richard A.; Klionsky, Daniel J.; Zakeri, Zahra (Landes Bioscience, 2013-09)
    Impaired autophagic machinery is implicated in a number of diseases such as heart disease, neurodegeneration and cancer. A common denominator in these pathologies is a dysregulation of autophagy that has been linked to a ...

  • Variants of the gene encoding the beta subunit of pyrophosphate dependent phosphofructokinase (PFP) and their transcriptional expression in sugarcane 

    Reddy, Sanushka (Stellenbosch : Stellenbosch University, 2001-12)
    ENGLISH ABSTRACT: Sugarcane, a complex polyploid, may theoretically contain up to 12 alleles for a particular gene at a single locus. The number of alleles and the extent of their variation is of particular importance ...

  • Vector refinable splines and subdivision 

    Andriamaro, Miangaly Gaelle (Stellenbosch : Stellenbosch University, 2008-12)
    In this thesis we study a standard example of refinable functions, that is, functions which can be reproduced by the integer shifts of their own dilations. Using the cardinal B-spline as an introductory example, we prove ...

  • Vegetation on and adjacent to mesas in the Nama-Karoo, South Africa : characteristics and comparisons 

    Pienaar, Eugene (Stellenbosch : Stellenbosch University, 2002-12)
    ENGLISH ABSTRACT: Arid lands comprise some 47.2 % of the world's land surface. Between 32 % and 35 % of these drylands are subject to some form of desertification and land degradation. South Africa is an arid country ...

  • Vegetation, soil and grazing relationships in the Middelburg District of the Eastern Cape 

    Hendricks, Neile Oliver (Stellenbosch : Stellenbosch University, 2003-12)
    ENGLISH ABSTRACT: Arid and semi-arid rangelands of the Nama-Karoo Biome are believed to have changed considerably since the arrival of domestic livestock in the veld. Severe grazing pressure is considered to be one of ...

  • Verification of patient position for proton therapy using portal X-Rays and digitally reconstructed radiographs 

    Van der Bijl, Leendert (Stellenbosch : University of Stellenbosch, 2006-12)
    This thesis investigates the various components required for the development of a patient position verification system to replace the existing system used by the proton facilities of iThemba LABS1. The existing system ...

  • Verifying stereo vision using structure from motion 

    Van Wyk, Barry-Michael Morne (Stellenbosch : Stellenbosch University, 2008-03)
    The medical radiation treatment facility at iThemba Labs requires a precise and robust patient positioning system. The current system makes use of an accurately calibrated multi-camera stereophotogrammetry (SPG) setup ...

  • Verkennende studie van die menings van vroulike werknemers, van geselekteerde Suid-Afrikaanse maatskappye, jeens korporatiewe drag 

    Frick, Beatrice Liezel (Stellenbosch : Stellenbosch University, 2000-03)
    ENGLISH ABSTRACT: Clothing is an important phenomenon within corporate and organisational culture and forms an integral part of the total corporate identity. It fulfills a symbolic purpose and serves as a reference. It is ...

  • Vertex-criticality of the domination parameters of graphs 

    Roux, Adriana (Stellenbosch : University of Stellenbosch, 2011-03)
    Please refer to full text to view abstract.

  • Video Surveillance Incorporating Pan-Tilt-Zoom Cameras 

    Holtzhausen, Petrus Jacobus (Stellenbosch : Stellenbosch University, 2015-03)
    ENGLISH ABSTRACT : When trespassers target businesses and homes, outdoor spaces are typically the first point of illegal entry. Camera systems can help secure these environments, but typically many cameras are needed to ...

  • A video-based traffic monitoring system 

    Magaia, Lourenco Lazaro (Stellenbosch : University of Stellenbosch, 2006-12)
    This thesis addresses the problem of bulding a video-based traffic monitoring system. We employ clustering, trackiing and three-dimensional reconstruction of moving objects over a long image sequence. We present an ...

  • Virtual world accessibility: a multitool approach 

    Kruger, Rynhardt Pieter (Stellenbosch : Stellenbosch University, 2014-12)
    ENGLISH ABSTRACT: Computer-based virtual worlds are increasingly used for activities which previously required physical environments. However, in its mainstream form, such a virtual world provides output on a graphical ...

  • Visiting ship bringing wood for construction 

    Albertyn, Chris (Stellenbosch : Antarctic Legacy Project, 2011-10-18)
    Video footage of a ship bringing wood and other supplies for construction at the base.

  • A visual programming environment for authoring ASD therapy tools 

    Msiska, Mwawi Fred (Stellenbosch : Stellenbosch University, 2011-12)
    ENGLISH ABSTRACT: 3D virtual environments can be used as therapy tools in patients with autism spectrum disorders (ASDs); however, the development of such tools is time-consuming. A 3D virtual environment development ...

  • Visualizing Qos in networks 

    Grift, Werner (Stellenbosch : University of Stellenbosch, 2006-12)
    ENGLISH ABSTRACT: Network simulations generate large volumes of data. This thesis presents an animated visualization system that utilizes the latest affordable Computer Graphics (CG) hardware to simplify the task of ...

  • Voyage to Bouvet Island 

    Albertyn, Chris (Stellenbosch : Antarctic Legacy Project, 2011-10-17)
    Video footage of Chris Albertyn's voyage to Bouvet Island on the SAS Natal and the events that took place. On this voyage Albertyn was the only member that did not set foot on the island. Researchers stayed for a day on ...

  • Wax characterisation by instrumental analysis 

    Webber, Glenda Vanessa (Stellenbosch : Stellenbosch University, 2000-12)
    ENGLISH ABSTRACT: Various companies produce waxes, which are used extensively in various applications, either as produced or as chemically or physically modified value-added products. They are used in the traditional ...