Browsing Faculty of Science by Title

Now showing items 1733-1752 of 2241

    • QoS routing in IP networks using multi-constrained computational methods 

      Fathelrahman, T. M. (Tayseer) (Stellenbosch : University of Stellenbosch, 2010-03)
      ENGLISH ABSTRACT: In this thesis, we consider the multi-constraints QoS routing problem in IP networks. Namely, we consider the problem of minimizing the path delays on IP networks. We use genetic algorithms to perform ...

    • The quadrifilar helix antenna and its application to wide angle phase-steered arrays 

      Marais, Sarel Jacobus (Stellenbosch : Stellenbosch University, 2007-03)
      ENGLISH ABSTRACT: The quadrifilar helix antenna has frequently been employed to provide the wide angle, circularly polarized radiation pattern which is preferable for mobile satellite communications. A detailed study of ...

    • Qualitative structure-activity relationships of the major tyrocidines, cyclic decapeptides from Bacillus aneurinolyticus 

      Spathelf, Barbara Marianne (Stellenbosch : University of Stellenbosch, 2010-03)
      ENGLISH ABSTRACT: The need for alternative or supplementary treatments due to the global problem of microbial resistance towards conventional antimicrobials may be met by the development of novel drugs based on antimicrobial ...

    • Quality assessment of domestic harvested rainwater in the peri-urban region of Kleinmond, Western Cape and the optimisation of point-of-use treatment systems 

      Dobrowsky, Penelope Heather (Stellenbosch : Stellenbosch University, 2014-04)
      ENGLISH ABSTRACT: Domestic rainwater harvesting (DRWH) refers to the collection and storage of rainwater for domestic purposes and in an effort to achieve the Millennium Development Goals (MGD), the South African government ...

    • The quality attributes of South African rabbit meat and consumer attitudes towards it 

      Nkhabutlane, Pulane (Stellenbosch : Stellenbosch University, 2004-03)
      ENGLISH ABSTRACT: Meat processing industries in South Africa are faced with the challenge to produce a variety of white meats. This is due to the fact that consumers tend to consume less red meat and more chicken and pork ...

    • The quantification of metabolic regulation 

      Van Zyl, Jalene (Stellenbosch : Stellenbosch University, 2013-02-25)
      ENGLISH ABSTRACT: Metabolic systems are open systems continually subject to changes in the surrounding environment that cause uctuations in the state variables and perturbations in the system parameters. However, ...

    • Quantitative Risk Management and Pricing for Equity Based Insurance Guarantees 

      Leboho, Nakedi Wilson (Stellenbosch : Stellenbosch University, 2015-03)
      ENGLISH ABSTRACT : Equity-based insurance guarantees also known as unit-linked annuities are annuities with embedded exotic, long-term and path-dependent options which can be categorised into variable and equity indexed ...

    • Quantitative survey of 3-alkyl-2-methoxypyrazines and first confirmation of 3-ethyl-2-methoxypyrazine in South African Sauvignon blanc wines 

      Alberts, P.; Kidd, M.; Stander, M. A.; Nieuwoudt, H. H.; Tredoux, A. G. J.; De Villiers, A. J. (South African Society for Enology and Viticulture, 2013)
      3-Alkyl-2-methoxypyrazines are important aroma components in Sauvignon blanc wine, contributing to the typical vegetative character associated with the cultivar. The analysis of methoxypyrazines is highly challenging ...

    • Quantum corrections to the kink-antikink potential 

      Lee, Zander (Stellenbosch : Stellenbosch University, 2017-03)
      ENGLISH ABSTRACT : In quantum field theory vacuum polarization effects may drastically alter the classical properties of non-perturbative field configurations. This is especially the case when comparing the vacuum ...

    • A quantum hall effect without landau levels in a quasi one dimensional system 

      Brand, Janetta Debora (Stellenbosch : Stellenbosch University, 2012-12)
      ENGLISH ABSTRACT: The experimental observation of the quantum Hall effect in a two-dimensional electron gas posed an intriguing question to theorists: Why is the quantization of conductance so precise, given the imperfections ...

    • Quantum information theory 

      Schumann, Robert Helmut (Stellenbosch : Stellenbosch University, 2000-12)
      ENGLISH ABSTRACT: What are the information processing capabilities of physical systems? As recently as the first half of the 20th century this question did not even have a definite meaning. What is information, and how ...

    • Quantum mechanical and experimental infra-red studies on stability and structural properties of substituted acylthiourea compounds 

      Ghebreysus Woldu, Mengistu (Stellenbosch : Stellenbosch University, 2004-12)
      ENGLISH ABSTRACT: Please see fulltext for abstract

    • Radial basis function interpolation 

      Du Toit, Wilna (Stellenbosch : Stellenbosch University, 2008-03)
      A popular method for interpolating multidimensional scattered data is using radial basis functions. In this thesis we present the basic theory of radial basis function interpolation and also regard the solvability and ...

    • The Radon-Nikodym and the Krein-Milman properties in Banach spaces 

      Nthebe, Johannes M. T. (Stellenbosch : Stellenbosch University, 2006-12)
      ENGLISH ABSTRACT: A Banach space X over the field of real numbers R. has the Radon-Nikodym property (RNP) if for each finite positive measure space (Ω,∑,µ) and each X-valued, µ-continuous measure v on ∑; with bounded ...

    • RAFT mediated polysaccharide copolymers 

      Fleet, Reda (Stellenbosch : University of Stellenbosch, 2006-12)
      Cellulose, one of the most abundant organic substances on earth, is a linear polymer of D-glucose units joined through 1,4-β-linkages. Cellulose is however not easily processed without chemical modification. A number of ...

    • RAFT-mediated synthesis of graft copolymers via a thiol-ene addition mechanism 

      Stegmann, Jacobus Christiaan (Stellenbosch : Stellenbosch University, 2007-12)
      ENGLISH ABSTRACT: The main objective of this project was the controlled synthesis of graft copolymers via a thiol-ene addition mechanism. The Reversible Addition-Fragmentation chain Transfer (RAFT) process was used in ...

    • Random generation of finite automata over the domain of the regular languages 

      Raitt, Lesley Anne (Stellenbosch : Stellenbosch University, 2006-12)
      ENGLISH ABSTRACT: The random generation of finite automata over the domain of their graph structures is a wellknown problem. However, random generation of finite automata over the domain of the regular languages has not ...

    • Random walk hitting times in random trees 

      Oosthuizen, Joubert (Stellenbosch : Stellenbosch University, 2017-12)
      ENGLISH ABSTRACT : The hitting time Hxy, between two vertices x and y of a graph, is the average time that the standard simple random walk takes to get from x to y. We start by giving a recursive formula for higher moments ...

    • Random walks on graphs 

      Oosthuizen, Joubert (Stellenbosch : Stellenbosch University, 2014-04)
      ENGLISH ABSTRACT: We study random walks on nite graphs. The reader is introduced to general Markov chains before we move on more specifically to random walks on graphs. A random walk on a graph is just a Markov chain ...

    • Rank matrix cascade algorithm, hermite interpolation 

      Dongmo, Guy Blaise (Stellenbosch : University of Stellenbosch, 2007-12)
      ENGLISH ABSTRACT: (Math symbols have changed) Wavelet and subdivision techniques have developed, over the last two decades, into powerful mathematical tools, for example in signal analysis and geometric modelling. Both ...