Now showing items 1-20 of 36

    • Some Mal'cev conditions for varieties of algebras. 

      Moses, Mogambery. (1991)
      This dissertation deals with the classification of varieties according to their Mal'cev properties. In general the so called Mal'cev-type theorems illustrate an interplay between first order properties of a given class ...
    • Conformal symmetries : solutions in two classes of cosmological models. 

      Moodley, Manikam. (1991)
      In this thesis we study the conformal symmetries in two locally rotationally symmetric spacetimes and the homothetic symmetries of a Bianchi I spacetime. The conformal Killing equation in a class AIa spacetime (MacCallum ...
    • Conformal motions in Bianchi I spacetime. 

      Lortan, Darren Brendan. (1992)
      In this thesis we study the physical properties of the manifold in general relativity that admits a conformal motion. The results obtained are general as the metric tensor field is not specified. We obtain the Lie derivative ...
    • The theory of option valuation. 

      Sewambar, Soraya. (1992)
      Although options have been traded for many centuries, it has remained a relatively thinly traded financial instrument. Paradoxically, the theory of option pricing has been studied extensively. This is due to the fact ...
    • On Stephani universes. 

      Moopanar, Selvandren. (1992)
      In this dissertation we study conformal symmetries in the Stephani universe which is a generalisation of the Robertson-Walker models. The kinematics and dynamics of the Stephani universe are discussed. The conformal ...
    • Relativistic spherical stars. 

      Mkhwanazi, Wiseman Thokozani. (1993)
      In this thesis we study spherically symmetric spacetimes which are static with a perfect fluid source. The Einstein field equations, in a number of equivalent forms, are derived in detail. The physical properties of a ...
    • On the integrity of domination in graphs. 

      Smithdorf, Vivienne. (1993)
      This thesis deals with an investigation of the integrity of domination in a.graph, i.e., the extent to which domination properties of a graph are preserved if the graph is altered by the deletion of vertices or edges or ...
    • Distance measures in graphs and subgraphs. 

      Swart, Christine Scott. (1996)
      In this thesis we investigate how the modification of a graph affects various distance measures. The questions considered arise in the study of how the efficiency of communications networks is affected by the loss of ...
    • Spatial modelling of fire dynamics in Savanna ecosystems. 

      Berjak, Stephen Gary. (1999)
      Fire is used in the management of ecosystems worldwide because it is a relatively inexpensive means of manipulating thousands of hectares of vegetation. Deciding how, where and when to apply fire depends primarily on the ...
    • Assessment of variability in on-farm trials : a Uganda case. 

      Lapaka, Odong Thomas (2002)
      On-farm trials techniques have become an integral part of research aimed at improving agricultural production especially in subsistence farming. The poor performance of certain technologies on the farmers' fields known to ...
    • Application of the wavelet transform for sparse matrix systems and PDEs. 

      Karambal, Issa. (2009)
      We consider the application of the wavelet transform for solving sparse matrix systems and partial differential equations. The first part is devoted to the theory and algorithms of wavelets. The second part is concerned ...
    • Bayesian analysis of cosmological models. 

      Moodley, Darell. (2010)
      In this thesis, we utilise the framework of Bayesian statistics to discriminate between models of the cosmological mass function. We first review the cosmological model and the formation and distribution of galaxy clusters ...
    • Group analysis of equations arising in embedding theory. 

      Okelola, Michael. (2010)
      Embedding theories are concerned with the embedding of a lower dimensional manifold (dim = n, say) into a higher dimensional one (usually dim = n+1, but not necessarily so). We are concerned with the particular case of ...
    • Identifying and modeling the dynamics of a core cancer sub-network. 

      Bayleyegn, Yibeltal Negussie. (2011)
      Many recent studies have shown that the initiation of human cancer is due to the malfunction of some genes at the R-checkpoint during the G1-to-S transition of the cell cycle. Identifying and modeling the dynamics of ...
    • Solution generating algorithms in general relativity. 

      Krupanandan, Daniel D. (2011)
      We conduct a comprehensive investigative review of solution generating algorithms for the Einstein field equations governing the gravitational behaviour of an isolated neutral static spherical distribution of perfect ...
    • Exact solutions for perfect fluids conformal to a Petrov type D spacetime. 

      Mewalal, Narenee. (2011)
      Abstract is available from the print copy.
    • Degree theory in nonlinear functional analysis. 

      Pillay, Paranjothi. (2013-10-21)
      The objective of this dissertation is to expand on the proofs and concepts of Degree Theory, dealt with in chapters 1 and 2 of Deimling [28], to make it more readable and accessible to anyone who is interested in the ...
    • Exact solutions for relativistic models. 

      Ngubelanga, Sifiso Allan. (2013-10-31)
      In this thesis we study spherically symmetric spacetimes related to the Einstein field equations. We consider only neutral matter and apply the Einstein field equations with isotropic pressures. Our object is to model ...
    • Impact of exogenous reinfection on TB infection in a genetically susceptible population. 

      Mwangi, Wangari Isaac. (2013-12-17)
      In this study we investigated the impact of exogenous reinfection on genetically resistant and genetically sensitive sub populations. We qualitatively analysed the dynamics of TB by assuming that TB is transmitted in two ...
    • Modelling the response of cytotoxic t-lymphocytes in controlling solid tumour invasion. 

      Malinzi, Joseph. (2013-12-20)
      We present mathematical models to study the mechanism of interaction of tumour infiltrating cytotoxic lymphocytes (TICLs) with tumour cells. We focus on the phase spaces of the systems and the nature of the solutions for ...