Recently added

ETD imports: Recent submissions

  • The transition between the mafic and the acid phase of the Bushveld complex in the Rustenburg-Brits area 
    Walraven, Feodor (University of Pretoria, 1977)
    In the western Transvaal the Veekraal granite (the Lebowa Granite Suite) and the basic rocks (the Rustenburg Layered Suite) of the Bushveld Complex are separated by a thickness of acid rocks here called the transition zone. ...
  • Bacteriological studies on the extension of the shelf life of raw minced beef 
    Von Holy, Alexander (University of Pretoria, 1983)
    Two hundred and thirty four samples of raw minced beef were subjected to storage at 0° and 7°C over a period of 17 days. The samples were subjected to four different treatments where the controls (TREAT 1) were aerobically ...
  • Stone-Cech compactification and rings of continuous functions 
    Walus, Yvonne Eve (University of Pretoria, 1991)
    The overall purpose of this thesis is to define and to investigate rings of continuous functions defined on completely regular topological spaces. One of the objectives, achieved in Chapter 1 and Chapter 3, is to present ...
  • Isolation and characterization of tick toxins 
    Viljoen, Gerrit Johannes (University of Pretoria, 1985)
    Ticks are the most important ectoparasites of domestic animals in the Republic of South Africa. Annual losses due to ticks amount to several hundred million Rand. They may cause disease since they may serve as vectors of ...
  • Lactic acid bacteria as antagonists of phytopathogenic bacteria 
    Visser, Ronel (University of Pretoria, 1987)
    Lactic acid bacteria were isolated from plants and plant-associated products. These isolates were identified and tested as possible biocontrol agents of certain phytopathogenic bacteria, namely: 2 strains of Xanthomonas ...
  • A Study of mathematical models for pseudo-homogeneous chemical reactors 
    Viljoen, Hendrik Jacobus (University of Pretoria, 1984)
    In the pseudo-homogeneous models of chemical reactors, one assumes that the content of the reactor is homogeneous. These models are categorized as two-dimensional (axial and radial changes occur) and one-dimensional models ...
  • n Eerste-orde turbulensiemodel vir sterkroterende straalvloei 
    Vermeulen, Dekker Adam (University of Pretoria, 1988)
    The aim of the project was the development of an efficient turbulence model for numerical simulation of strongly swirling incompressible jet flow. As point of departure a general review is given of turbulence modelling in ...
  • n Plantsosiologiese studie van die Suikerbosrandnatuurreservaat 
    Bredenkamp, George Johannes (University of Pretoria, 1975)
    Die doel van hierdie studie was om die plantegroei van die Suikerbosrandnatuurreservaat volgens die metodes van die Zurich-Montpellier-skool vir plantsosiologie t~ klassifiseer, te beskryf, te karakteriseer en ekologies ...
  • Purification and characterisation of tick toxins 
    Viljoen, Gerrit Johannes (University of Pretoria, 1983)
    Ectoparasites can serve as vectors of numerous disease agents i.e. they are involved in maintaining and transmitting for example viral and rickettsial organisms pathogenic to man and animals (Sl). An understanding of these ...
  • Vibrational analysis of the low-temperature modification of the chloride spinels : Li2MCl4 (M = Fe, Co and Cr) 
    Van Rooyen, Gert Cornelis (University of Pretoria, 1992)
    A vibrational analysis is carried out for the low-temperature modification of the chloride spinals: Li 2MC1 4 (M = Fe, Co and Cr), with special emphasis on the theoretical interpretation and representation of the vibrational ...
  • Thermogravimetry : a method to evaluate the regenerability of activated carbon 
    Vennekens, Marc Jozef August (University of Pretoria, 1988)
    A method was developed to evaluate solid phase adsorbate distribution and implied regenerability of activated carbon used in water reclamation. The method is based on thermal analysis principles and consists of heating the ...
  • Applications of Raman spectroscopy to solid state chemistry 
    Venter, Myrl Wendy (University of Pretoria, 1989)
    Two investigations of solid state chemistry problems, using various aspects of Raman spectroscopy, are described. The first includes high pressure studies of pyridine and ZnCl2py2. Both of these studies gave phases which ...
  • Ground-water in the Orange Free State Gold-Field 
    Venter, Philippus Petrus (University of Pretoria, 1967)
    The difficulties experienced in the control and disposal of large flows of saline water in to the mine workings in the Orange Free State Gold-field provided the impetus for a detailed study of the geohydrological conditions ...
  • The development of rational basis functions for the finite element method 
    Van Niekerk, Andre (University of Pretoria, 1989)
    This thesis is concerned with the development of rational basis functions for the finite element method to obtain the numerical solution of time- dependent partial differential equations. The concept of a rational basis ...
  • Characterization of waveguides, beam coupling and propagation for simulated Raman conversion 
    Van Heerden, Stephanus Philipus (University of Pretoria, 1993)
    The Raman conversion of a 10 μm CO2 laser beam in parahydrogen is an integral part of the 235 UF6 laser isotope enrichment process. The nonlinear Raman process depends strongly on the input laser power density. Lasers ...
  • Sonering van 'n dolomietgebied suid van Pretoria met behulp van 'n meervoudige-faktor klassifikasiestelsel 
    Van Rooy, Jan Louis (University of Pretoria, 1984)
    One of the requirements for establishing a township on dolomitic rocks in the Transvaal is the submission of a geological report on the township. The aim of the geological investigation is to delineate areas of low risk ...
  • Eindige-element-metodes vir tydafhanklike parsiele differensiaalvergelykings 
    Van Niekerk, Frederik Devillebois (University of Pretoria, 1981)
    This thesis is concerned with the numerical solutions of time-dependent differential equations by finite element methods. The solutions are approximated by finite elements which depend on both space and time variables. A ...
  • n Raman- en X-straalstudie van alkalimetaalformiate 
    Van Niekerk, Ockert Tobias (University of Pretoria, 1987)
    The crystallographic and spectroscopic properties of the alkali metal formiates are investigated, with particular emphasis on the thermal behaviour of these salts. X-ray powder diffraction, Raman spectroscopy and thermal ...
  • Die gebruik van dialise in vloei-inspuitanalise 
    Van Rensburg, Ancel (University of Pretoria, 1989)
    The growth in analytical chemistry and in particular analytical biochemistry during the last decade, highlighted the necessity for automatic analytical systems. The majority of automated systems are flow-injection analytical ...
  • Structural studies on the toxic principle of Ornithogalum Thyrsoides 
    Van der Westhuizen, Driekus (University of Pretoria, 1966)
    The main aim of the investigation as described in the thesis, is the isolation and structure elucidation of the toxic principle(s) of the plant 0rnithogalum thyrsoides. Extracts of fresh 0. thyrsoides material were evaluated ...