Now showing items 43-56 of 56

    • 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 ...
    • 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 ...
    • On the physical viability of horizon-free collapse. 

      Ntshangase, Mlungisi Alex Doctor. (2015-09-04)
      The so-called Cosmic Censorship Conjecture has drawn widespread attention amongst astrophysicists and particle physicists. In particular, the end-state of gravitational collapse of a bounded matter distribution is a ...
    • 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 ...
    • Relativistic thermodynamics of radiating stars. 

      Bogadi, Robert Sacha. (2016)
      In this research, on the topic of relativistic thermodynamics of radiating stars, the following three case studies are investigated: Gravitational collapse in spacially isotropic coordinates { The nature of a ...
    • Searching for exoplanets using the transit method. 

      Essack, Zahra. (2017)
      We present a study designed to detect transiting exoplanets in Kepler light curve data. We developed an exoplanet detection algorithm based on modelling transit light curves and fitting the models to light curve data ...
    • Shear-free models for relativistic fluids with heat flow and pressure isotropy. 

      Brassel, Byron P. (2014)
      We model the interior dynamics of a relativistic radiating fuid in a nonstatic spher- ically symmetric spacetime. The matter distribution takes the form of an imperfect fuid with a nonvanishing radially directed heat ...
    • 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 ...
    • 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 ...
    • Southern African Large Telescope observations of Sunyaev-Zel'dovich effect selected clusters from the Atacama Cosmology Telescope. 

      Kirk, Brian. (2014)
      We present Southern African Large Telescope (SALT) follow-up observations of seven massive clusters detected by the Atacama Cosmology Telescope (ACT) using the Sunyaev-Zel’dovich effect (SZE). We conducted multi-object ...
    • 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 ...
    • 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 ...
    • Using spectral methods on HIV infection with TAT and SSU72 activation. 

      Mungwe, S'yanda Nkanyiso. (2016)
      HIV dynamics within the host are complex especially when a reservoir of latently infected CD4+ T cells are present. The failure of the immune system and antiviral therapy to suppress the virus has been suggested to be ...
    • Weak gravitational lensing in the cosmic microwave background : reconstructing the lensing convergence. 

      Ridl, Jethro Venn. (2015-01-05)
      Many of the most significant constraints on the standard model of Cosmology describing the origins, contents and evolution of the Universe arise from the Cosmic Microwave Background (CMB). As we enter an era of precision ...