Browsing Faculty of Science by Title

Now showing items 1196-1215 of 1925

    • N-heterosikliese karbeenkomplekse van groep 10 metale : nuwe moontlikhede 

      Kruger, Anneke (Stellenbosch : Stellenbosch University, 2007-03)
      ENGLISH ABSTRACT: This study comprises the synthesis and characterisation of N-heterocyclic carbene complexes of group 10 metals with the main focus on such complexes with the nucleophilic N-atom in a position further ...

    • N-vinylpyrrolidone-vinyl acetate block copolymers as drug delivery vehicles 

      Bailly, Nathalie (Stellenbosch : Stellenbosch University, 2012-03)
      ENGLISH ABSTRACT: The primary aim of this study was to investigate the feasibility of the amphiphilic block copolymer poly((vinylpyrrolidone)-b-poly(vinyl acetate)) (PVP-b-PVAc) as a vehicle for hydrophobic anti-cancer ...

    • Nanochemistry through self-assembly : polymerisation of the organised phases of polyelectrolyte-surfactant complexes 

      Ganeva, Desislava Evgenieva (Stellenbosch : Stellenbosch University, 2003-12)
      ENGLISH ABSTRACT: The general objective of this research was to develop a new approach to direct templating, where the organised phases of polyelectrolyte-surfactant complexes are used as hosts for organic polymerisation ...

    • Nanocolorants for hot-melt inks 

      Al-Aeeb, Ahmed Z. (Stellenbosch : Stellenbosch University, 2013-03)
      ENGLISH ABSTRACT: A new class of nanocolorants is described for the use as a colorant in hot-melt ink application for ink-jet printing technology. An inverse miniemulsion polymerization process was utilized successfully ...

    • Native Fusarium species from indigenous fynbos soils of the Western Cape 

      Bushula, Vuyiswa Sylvia (Stellenbosch : Stellenbosch University, 2008-12)
      The genus Fusarium contains members that are phytopathogens of a number of agricultural commodities causing severe diseases such as wilts and rots. Fusarium species also secrete mycotoxins that have devastating effects ...

    • NCR-sensitive gene expression and regulation of nitrogen interconversion by VID30 in Saccharomyces cerevisiae 

      Van der Merwe, George K., (George Karel)1968- (Stellenbosch : Stellenbosch University, 2002-03)
      ENGLISH ABSTRACT: Saccharomyces cerevisiae uses the nitrogenous compounds in its environment selectively. The basis of this phenomenon is the transcriptional regulation of genes whose products are required for nitrogen ...

    • Near vector spaces 

      De Bruyn, Aletta (Stellenbosch : Stellenbosch University, 1990)
      ENGLISH ABSTRACT: The preliminary material in Chapter 1 is included in order that this work be reasonably self-contained. The main aim of this thesis is to give an exposition of the theory of near vector spaces, as ...

    • Near-target and other heavy residues in the interaction of ¹²C and ¹⁶O with ¹⁰³Rh 

      Buthelezi, Edith Zinhle (Stellenbosch : University of Stellenbosch, 2004-04)
      ENGLISH ABSTRACT: This study forms part of a larger investigation which has as a primary objective the development of a comprehensive theoretical description of all the processes which contribute to the continuum in ...

    • Nectar distribution and nectarivorous bird foraging behaviour at different spatial scales 

      Coetzee, Anina (Stellenbosch : Stellenbosch University, 2016-03)
      ENGLISH ABSTRACT: While foraging strategies of animals may be shaped by the distribution of their food resources, these strategies in turn also affect the ecology and evolution of their resources. In this regard, African ...

    • Negative thermal expansion of organic compounds 

      Greyling, Guillaume Hermanus (Stellenbosch : Stellenbosch University, 2011-03)
      ENGLISH ABSTRACT: The primary objective of the work was to investigate the negative thermal expansion of organic materials and to determine the mechanisms governing this phenomenon by using the principles of crystal ...

    • Neighbourhood operators on Categories 

      Razafindrakoto, Ando Desire (Stellenbosch : Stellenbosch University, 2013-03)
      ENGLISH ABSTRACT: While the notions of open and closed subsets in a topological space are dual to each other, they take on another meaning when points and complements are no longer available. Closure operators have ...

    • Neonatal recognition in sheep 

      Burger, B. V.; Viviers, Marlize Z.; Le Roux, Niel J.; Morris, John; Bekker, Jan P. I.; Le Roux, Maritha (Springer New York, 2013)
      The strong bond formed between ewe and lamb shortly after parturition is an important factor in lamb survival. Evidence exists that the ewe can distinguish her lamb by its unique smell, but the constituents of such a ...

    • Network engineering using multi-objective evolutionary algorithms 

      Baruani, Atumbe Jules (Stellenbosch : Stellenbosch University, 2007-12)
      ENGLISH ABSTRACT: We use Evolutionary Multi-Objective Optimisation (EMOO) algorithms to optimise objective functions that reflect situations in communication networks. These include functions that optimise Network ...

    • Neural network ensembles 

      De Jongh, Albert (Stellenbosch : Stellenbosch University, 2004-04)
      ENGLISH ABSTRACT: It is possible to improve on the accuracy of a single neural network by using an ensemble of diverse and accurate networks. This thesis explores diversity in ensembles and looks at the underlying theory ...

    • New amino- and titanoxycarbene complexes of group 6 metals 

      Heydenrych, Greta (Stellenbosch : Stellenbosch University, 2001-03)
      ENGLISH ABSTRACT: Please refer to fulltext for abstract

    • New and interesting orchid records for Tanzania 

      Bytebier, Benny; Sakwa, Jane; Kurzweil, Hubert (BioOne, 2004-01)
      The orchid taxa Brachycorythis ovata subsp. schweinfurthii, Habenaria arianae and Habenaria disparilis are newly recorded for Tanzania, while Brachycorythis congoensis is newly recorded for the floral region T7. A stable, ...

    • New approaches to the synthesis and exfoliation of polymer/functional graphene nanocomposites by miniemulsion polymerization 

      Etmimi, Hussein Mohamed (Stellenbosch : Stellenbosch University, 2012-03)
      ENGLISH ABSTRACT: New methods are described for the synthesis of polymer/graphite nanocomposites using the miniemulsion polymerization process. Natural graphite was functionalized by oxidation to produce graphite oxide ...

    • New developments in the coordination chemistry of Gold(I), Gold(II) and Gold(III) with C-, N- , P-and S-donor ligands 

      Coetzee, Jacorien (Stellenbosch : University of Stellenbosch, 2007-03)
      A comprehensive, comparative structural study of gold(I), gold(II) and gold(III) compounds with the general formula [Aux(C6F5)y(tht)z] (tht = tetrahydrothiophene) was performed. The series of compounds included the ...

    • A new femtosecond electron diffractometer for structural dynamics experiments at cryogenic temperatures 

      Smit, Albert Bart (Stellenbosch : Stellenbosch University, 2014-12)
      ENGLISH ABSTRACT: In this thesis, a femtosecond electron diffraction (FED) set-up that is capable of investigating the photo-induced switching of Cu(DCNQI)2 from being an insulator to being a conductor is presented. ...

    • New gold(I) and gold(III) coordination complexes derived from N and S heterocycles 

      Kifle Hagos, Tesfamariam (Stellenbosch : University of Stellenbosch, 2006-03)
      Please refer to full text for abstract