Now showing items 70-89 of 104

    • Novel laser beams for optical trapping and tweezing. 

      Ismail, Yaseera. (2011)
      Optical trapping and tweezing has been around for the last 30 years and since found its place in the fields of physics and biology. Over the years this technique has advanced exceedingly and is a unique tool to carry out ...
    • Novel pulsed power applications. 

      Turner, Geoffrey Robert. (2001)
      The purpose of this dissertation is to examine the mechanisms of the glow (Townsend) discharge, the arc (streamer) discharge, the corona discharge, and the vacuum discharge. The physics of each discharge is presented and ...
    • Nuclear structure studies with (n,d) reactions. 

      Naidoo, Ravenderan Yagambaram. (2013-11-08)
      The ²⁷AI(n,d)²⁶Mg and ⁵⁶Fe(n,d)⁵⁵Mn reactions have been studied at 22 MeV incident energy. The 6MV Van de Graaff facility at the National Accelerator Centre, Faure was used for the experimental aspects. An (n, charged ...
    • Numerical sampling of nonadiabatic dynamics of quantum-classical systems. 

      Uken, Daniel A. (2010)
      The simulation of the dynamics of quantum systems is very di cult, due to the fact that, in general, it cannot be calculated exactly for interacting many-body systems. Brute force simulations of quantum dynamics are ...
    • Numerical simulation of pressure response in partially completed oil wells. 

      Strauss, Jonathan Patrick. (2002)
      This work is concerned with the application of finite difference simulation to modelling the pressure response in partially penetrating oil wells. This has relevance to the oil and hydrology industries where pressure ...
    • On non-Hermitian quantum mechanics. 

      Peacock, Jared L. (2014-03-19)
      The purpose of this dissertation is to review the salient features of non-Hermitian quantum mechanics. An introduction to Hermitian quantum mechanics is included to make this review as accessible as possible. Attempts ...
    • Outer electron radiation belt dropouts : Geosynchronous and ionospheric responses. 

      Ogunjobi, Olakunle. (2011)
      The study of outer radiation belt dynamics has been ongoing for over 5 decades. Outer radiation belt dropouts involve the rapid lost of electron fluxes at the main phase of a storm and subsequent recovery. The characteristics ...
    • Pharos : pluri-director, high-resolution, analyser of radiometric properties of soil cores. 

      Pitout, Richard. (2001)
      The core-logger has been designed for the high-resolution radiometric analysis of soil cores using multiple detectors. This device allows for the automation of the measuring process and eliminates the need to dissect the ...
    • Phytochemical, elemental and biotechnological study of cryptocarya latifolia, an indigenous medicinal plant of South Africa. 

      Hamza, Mohammed Falalu. (2013)
      Cryptocarya latifolia (Lauraceae) is an indigenous South African plant used in ethnomedicinal practices. Traditional healers in KwaZulu-Natal, South Africa are extensively using the bark of C. latifolia as a substitute for ...
    • Preparation and characterization of organic solar cell. 

      Bell, July Teboho. (2014-02-12)
      Organic molecules based photovoltaic cells were fabricated in an open laboratory conditions without the use of glove box or clean room. Conducting polymers such as P3HT and PCBM were used as a photo-active layer of ...
    • Profile analysis of X-ray powder diffraction data. 

      Naicker, Vishnu Visvanathan. (2013-11-07)
      Various strategies have been tested for obtaining integrated intensities from x-ray powder diffractometer data. An asymmetric pseudo-Voigt profile function was used to fit the pattern in the region above 2θ = 35̊ (Cu-Kα ...
    • Progress with the colliding shock lens. 

      Mahlase, Andrew Conrad Khoro. (2013)
      The Colliding Shock Lens (CSL) exploits the interference of shock waves in a gas to form a region in which high pressure, temperature and density change the refractive index of the gas, making it possible to focus laser ...
    • Quantum dynamics in classical constant-temperature baths. 

      Dlamini, Nkosinathi B. (2013-05-23)
      In this dissertation the formulation of various integration algorithms is studied, with a view to simulate quantum-classical systems in contact with a thermal bath. In particular focus is given to the constant temperature ...
    • Quantum dynamics in the partial Wigner picture. 

      Beck, Geoffrey Martin. (2013)
      The Wigner formalism can be used to provide a representation of quantum dynamics in a classical-like phase space. However, there are many cases, such as when dealing with spin systems in a dissipative environment, in ...
    • Radiating solutions with heat flow in general relativity. 

      Govender, Megandren. (1994)
      In this thesis we model spherically symmetric radiating stars dissipating energy in the form of a radial heat flux. We assume that the spacetime for the interior matter distribution is shear-free. The junction conditions ...
    • A satellite and ground based study of fine structure in VLF whistlers. 

      Caldeira, Paulo S. (1992)
      The matched filtering technique for improving the spectral resolution of VLF whistlers, originally developed by Bhegin and Siredey (1964), has proven to be useful for extracting information about the magnetospheric plasma ...
    • Security and entanglement in differential-phase-shift quantum key distribution. 

      Marais, Adriana. (2009)
      Quantum key distribution (QKD) aims at the creation of a secret key in the two locations of partners, traditionally Alice and Bob, wishing to communicate in private. A generic QKD protocol utilises a quantum channel and ...
    • Simple qubit systems in bosonic baths. 

      Pumulo, Nathan. (2013-10-03)
      The study is focused on the thermal entanglement of spin chains. Chains consisting of two and three qubits are considered. These chains are considered open because they are coupled to bosonic baths at different temperatures. ...
    • A statistical lightning model. 

      Van Zyl, Marlie. (2013-11-29)
      The detailed spatial and temporal influence of lightning on precipitation losses from the Earth's radiation belts is not yet well known. The precipitation is mainly due to the pitch angle scattering of electrons by lightning ...
    • Stratospheric ozone climatology and variability from ground-based and satellite observations over Irene, South Africa (25.5°S; 28.1°E) 

      Ogunniyi, Jeremiah Ayodele. (2014)
      The climatological characteristic of ozone over Irene (25.˚S, 28.1˚E) was assessed in this thesis using ground-based satellite observations. The aim of this was to examine the variability of both total and vertical ozone ...