• A path integral approach to the coupled-mode equations with specific reference to optical waveguides 

      Mountfort, Francesca Helen (Stellenbosch : University of Stellenbosch, 2009-03)
      The propagation of electromagnetic radiation in homogeneous or periodically modulated media can be described by the coupled mode equations. The aim of this study was to derive analytical expressions modeling the solutions ...
    • Photoinduced charge dynamics in indoline-dye sensitised solar cells 

      Minda, Iulia (2014-12)
      ENGLISH ABSTRACT: The demand for renewable energy sources has grown out of the humanity’s increasing need for electricity as well as depleting fossil fuel reserves. Organic-dye sensitised solar cells were developed as a ...
    • Point spread function engineering for fluorescence microscopy 

      Holinirina Dina Miora, Ratsimandresy (Stellenbosch : Stellenbosch University, 2018-03)
      ENGLISH SUMMARY: A tool for biological imaging is developed within this work. It consists of engineering the point spread function (PSF) of a fluorescent molecule or a nanoparticle emitter by modulating the phase of the ...
    • Polymer networks at surfaces 

      Vandoolaeghe, Wendy Leigh (Stellenbosch : Stellenbosch University, 2003-03)
      ENGLISH ABSTRACT: In this thesis the formation and properties of a polymer gel on and at a surface are investigated. The gel under investigation is defined as a three-dimensional network of macromolecules that form ...
    • Polymer networks with mobile force-applying crosslinks 

      Mateyisi, Mohau Jacob (Stellenbosch : University of Stellenbosch, 2011-03)
      ENGLISH ABSTRACT: We construct and study a simple model for an active gel of exible polymer filaments crosslinked by a molecular motor cluster that perform reversible work while translating along the filaments. The ...
    • Portable X-ray fluorescence and nuclear microscopy techniques applied to the characterisation of southern African rock art paintings 

      Steyn, Ruan (Stellenbosch : Stellenbosch University, 2014-04)
      ENGLISH ABSTRACT: Non-destructive portable X-ray Fluorescence (pXRF) and Particle Induced X-ray Emission (PIXE) were used to measure the elemental concentration of rock art fragment paintings. For pXRF the Amptek Silicon ...
    • Pre-equilibrium excitation of nuclei in ([rho], [alpha]) and ([rho], 3He) reactions induced by 120, 160 and 200 MeV protons 

      Arendse, Gillian John (Stellenbosch : Stellenbosch University, 1994)
      ENGLISH ABSTRACT: The study of pre-equilibrium reactions induced by medium-energy light ions have become of increasing importance in recent years as they represent the bulk of the measured spectrum. On a nuclear time ...
    • The production of hypernuclei via the weak interaction 

      Van Niekerk, David Douglas (Stellenbosch : University of Stellenbosch, 2007-03)
      In this thesis we present a relativistic formalism for the description of hypernuclei production via the weak interaction. It will be shown that the cross section can be written as the contraction of a leptonic and ...
    • Proton pencil beam kernels as extracted from Geant4 Monte Carlo simulations 

      Chisapi, Maluba Vernon J. (Stellenbosch : Stellenbosch University, 2016-12)
      ENGLISH ABSTRACT : The contribution of primary protons, secondary protons, heavy recoil ions, and other secondary particles to the total energy deposited in water by a proton pencil beam (in the therapeutic energy regime) ...
    • 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 ...
    • Relativistic mean-field theory applied to the study of neutron star properties 

      Diener, Jacobus Petrus Willem (Stellenbosch : Stellenbosch University, 2008-03)
      Nuclear physics can be applied in various ways to the study of neutron stars. This thesis reports on one such application, where the relativistic mean-field approximation has been employed to calculate the equations of ...
    • Relativistic quantum mechanics on non-commutative spaces 

      Williams, Paul Henry (Stellenbosch : Stellenbosch University, 2015-12)
      ENGLISH ABSTRACT: A brief review of non-relativistic and relativistic quantum mechanics is carried out, with particular attention to concepts that are modified in the noncommutative setting. The Hilbert-Schmidt operator ...
    • Resonance ionization spectroscopy with time of flight mass spectrometry 

      Waso, Frederick John (Stellenbosch : Stellenbosch University, 2019-04)
      ENGLISH ABSTRACT : Resonance ionization using laser light is one of the most useful techniques for isolating radioactive isotopes and producing radioactive ion beams at accelerator facilities around the world. The aim of ...
    • Response of NaI(T1) detectors in geophysical applications 

      Titus, Nortin P. (Stellenbosch : Stellenbosch University, 2005-03)
      ENGLISH ABSTRACT: Airborne gamma-ray spectrometry is used for exploration and environmental monitoring over large areas. Such datasets of 7-ray are acquired using large 16l NaI(T1) detector crystals mounted in an aircraft. ...
    • The Role of a direct knock-out mechanism in the inclusive (p, α) reaction 

      Van Zyl, Johannes Jacobus (Stellenbosch : University of Stellenbosch, 2008-03)
      Experimental double differential cross sections and analyzing powers for the inclusive 93 Nb(p,α) r and 93 Nb(p, 3He) r reactions have been measured at an incident energy of 160 MeV. The results of this experiment, for ...
    • Scattering in soliton models and crossing symmetry 

      Abdelhady, A. M. H. H. (Stellenbosch : Stellenbosch University, 2012-12)
      ENGLISH ABSTRACT: Crossing symmetry relates scattering and annihilation processes to each other. Its derivation is straightforward in perturbative approaches to quantum field theory: it merely reflects the exchange of ...
    • Search for the scissors resonance in 182Ta 

      Brits, Christiaan Petrus (Stellenbosch : Stellenbosch University, 2016-12)
      ENGLISH ABSTRACT :Relatively small changes to the overall shape of the photon strength function such as the scissors or pygmy resonances can have a significant impact on reaction rates. Reaction rates are important for ...
    • Self-organised criticality and seismicity 

      Boonzaaier, Leandro (Stellenbosch : Stellenbosch University, 2002-12)
      ENGLISH ABSTRACT: In this thesis we give an overview of self-organised criticality and its application to studying seismicity. We recall some of the basic models and techniques for studying self-organised critical systems. ...