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  • Translocation of a polymer chain under geometric confinement 

    Gumede, Sthembiso R. (Stellenbosch : Stellenbosch University, 2014-04)
    ENGLISH ABSTRACT: The advent of the synthesis or manufacturing of controlled structures on submicron scales as well as experimental developments enabling the investigation of physics in speci c biological systems at ...
  • 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 ...
  • Crossovers and phase transitions in Bose-Fermi mixtures 

    Kimene Kaya, Boniface Dimitri Christel (Stellenbosch : Stellenbosch University, 2014-04)
    ENGLISH ABSTRACT: We present a theoretical approach that allows for the description of trapped Bose-Fermi mixtures with a tunable interspecies interaction in the vicinity of a Feshbach resonance magnetic field.The many-body ...
  • Suboptimal LULU-estimators in measurements containing outliers 

    Astl, Stefan Ludwig (Stellenbosch : Stellenbosch University, 2013-12)
    ENGLISH ABSTRACT: Techniques for estimating a signal in the presence of noise which contains outliers are currently not well developed. In this thesis, we consider a constant signal superimposed by a family of noise ...
  • Thulium doped fibre lasers in continuous-wave and pulsed regimes 

    Coetzee, Riaan Stuart (Stellenbosch : Stellenbosch University, 2013-12)
    ENGLISH ABSTRACT: The following work focuses on the development and characterization of efficient, high-power, Thulium doped fibre lasers. Lasers emitting light around ~2 μm have generated a large amount of interest owing ...
  • Development of a magneto optical trap for Rubidium 87 

    Elnour, Huzifa Mohammed Ahamed Mohammed (Stellenbosch : Stellenbosch University, 2013-12)
    ENGLISH ABSTRACT: A Magneto Optical Trap (MOT) is a configuration formed by three orthogonal pairs of counterpropagating circularly polarized laser beams and a magnetic field gradient. A MOT is used to cool, capture and ...
  • Manipulation of short pulses 

    Okoye, Raphael (Stellenbosch : Stellenbosch University, 2013-12)
    ENGLISH ABSTRACT: An ultra-fast laser pulse can be described in the time or frequency domain. If the timebandwidth product of an ultra-fast pulse is not satisfied, then the pulse is stretched. Stretching can be described ...
  • Modelling of end-pumped Ho:YLF amplifiers 

    Collett, Oliver John Philip (Stellenbosch : Stellenbosch University, 2013-03)
    This work is a thesis regarding the energy scaling of end-pumped Ho:YLF amplifiers. The work includes: a brief review of laser physics and models, the development of a suitable three dimensional time resolved numerical ...
  • Development and application of tunable VUV laser sources 

    Nortje, Anton Christiaan (Stellenbosch : Stellenbosch University, 2013-03)
    ENGLISH ABSTRACT: A tunable narrow-bandwidth vacuum ultra violet laser source was developed and characterised. Two-photon resonant four-wave sum-frequency mixing of two pulsed dye laser beams in magnesium vapour was used ...
  • Geodesics and resonances of the Manko-Novikov spacetime 

    Geyer, Marisa (Stellenbosch : Stellenbosch University, 2013-03)
    ENGLISH ABSTRACT: In this thesis I study compact objects described by the Manko-Novikov spacetime. The Manko- Novikov spacetime is an exact solution to the Einstein Field Equations that allows objects to be black hole-like, ...
  • Spectral and temporal modulation and characterization of femtosecond ultra-short laser pulses 

    Mbanda Nsoungui, Gaelle Carine (Stellenbosch : Stellenbosch University, 2012-12)
    ENGLISH ABSTRACT: Ultra-short laser pulses are useful in materials processing like melting and cutting metals, and medical applications such as surgery and many other fields. In this study, we characterize and control ...
  • Terahertz (THz) spectroscopy 

    Numan, Nagla Numan Ali (Stellenbosch : Stellenbosch University, 2012-12)
    ENGLISH ABSTRACT: Terahertz radiation is currently used in security, information and communication technology (ICT), and biomedical sciences among others. The usability of terahertz (THz) radiation, in many of its ...
  • 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 ...
  • Theoretical investigation of dielectrophoresis and electrophoresis as techniques for silver deflections 

    Mokgalapa, Naphtali Malesela (Stellenbosch : Stellenbosch University, 2012-12)
    ENGLISH ABSTRACT: The primary circuit components of very high temperature reactors (VHTRs) experience various unwanted fission products such as Kr, Xe, I, Cs, Sr, and Ag. These particle are generated during normal ...
  • 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 ...
  • 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 ...
  • Flow equations for hamiltonians from continuous unitary transformations 

    Bartlett, Bruce (Stellenbosch : Stellenbosch University, 2003-03)
    ENGLISH ABSTRACT: This thesis presents an overview of the flow equations recently introduced by Wegner. The little known mathematical framework is established in the initial chapter and used as a background for the entire ...
  • 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. ...
  • Numerical design of an optical solid-state amplifier 

    Van der Westhuizen, Gysbert Johannes (Stellenbosch : Stellenbosch University, 2007-12)
    Please refer to full text for abstract
  • Statistical thermodynamics of long-range quantum spin systems 

    Olivier, G. J. F. (Gerrit Jacobus Francois) (Stellenbosch : Stellenbosch University, 2012-03)
    ENGLISH ABSTRACT:In this thesis we discuss some of the anomalies present in systems with long-range interactions, for instance negative speci c heat and negative magnetic susceptibility, and show how they can be related ...