• Large deviations of reflected diffusions 

      Du Buisson, Johannes Petrus (Stellenbosch : Stellenbosch University., 2020-04)
      ENGLISH ABSTRACT: We study the fluctuations of time-integrated functionals of Markov diffusions evolving in a bounded domain. These fluctuations can be described in large deviation theory by the so-called rate function, which ...
    • Laser induced chlorphyll fluorescence of plant material 

      Ombinda-Lemboumba, Saturnin (Stellenbosch : University of Stellenbosch, 2007-03)
      Imaging and spectroscopy of laser induced chlorophyll fluorescence (LICF) are emerging as useful tools in plant physiology and agriculture since these methods allow an early detection of plant stress and transformation ...
    • Locating the inner edge of a neutron star crust 

      Van Rooy, Milton William (Stellenbosch : University of Stellenbosch, 2010-12)
      ENGLISH ABSTRACT: The overall goal of this project is to study neutron star properties and locate the transition density from the core to the crust using fifteen parameter sets of the effective Skyrme nucleon-nucleon interaction ...
    • 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 ...
    • Measurement and extraction of the Giles parameters in Ytterbium-doped fibre 

      Hendriks, Adriaan Jacobus (Stellenbosch : University of Stellenbosch, 2009-03)
      The role fulfilled by theoretical models is rapidly increasing due to lasers becoming appli- cation driven to satisfy certain criteria and demands. Construction of high precision lasers requires good theoretical models ...
    • Methods for the radiological characterisation of the FiR 1 TRIGA research reactor decommissioning waste 

      Ackermann, Tarryn (Stellenbosch : Stellenbosch University, 2017-03)
      ENGLISH ABSTRACT : Every nuclear reactor will eventually reach the end of its life time. With more than 60 new power reactors currently under construction, the need for understanding the safe decommissioning of a nuclear ...
    • The metric for non-Hermitian Hamiltonians : a case study 

      Musumbu, Dibwe Pierrot (Stellenbosch : Stellenbosch University, 2006-12)
      ENGLISH ABSTRACT: We are studying a possible implementation of an appropriate framework for a proper non- Hermitian quantum theory. We present the case where for a non-Hermitian Hamiltonian with real eigenvalues, we ...
    • Microdosimetric studies of Auger electrons from DNA-incorporated 123-I using the micronucleus assay and the Geant4 Monte Carlo simulation tookit 

      Fourie, Hein (Stellenbosch : Stellenbosch University, 2014-12)
      ENGLISH ABSTRACT: This study’s focus is on the determination and quantization of radiation damage on a cellular level due to the decay of the Auger electron-emitting 123I and the replication of this energy deposition using ...
    • 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 ...
    • Monte Carlo simulation of direction sensitive antineutrino detection 

      Blanckenberg, J. P (Jacobus Petrus) (Stellenbosch : University of Stellenbosch, 2010-03)
      ENGLISH ABSTRACT: Neutrino and antineutrino detection is a fairly new eld of experimental physics, mostly due to the small interaction cross section of these particles. Most of the detectors in use today are huge ...
    • Natural radioactivity in soils of Ijero, Nigeria: measurements and risk assessment 

      Bailey, Tarryn (Stellenbosch : Stellenbosch University, 2019-12)
      ENGLISH ABSTRACT: Several soil samples were obtained from Ijero, Nigeria, where the chemical and radio-toxicity of soil is under question due to ongoing and unregulated mining activities. The soil samples were crushed, ...
    • A near infrared femtosecond laser source for observation of charge transfer processes in semiconductors 

      Ahmed, Essraa Taha (Stellenbosch : Stellenbosch University, 2017-03)
      ENGLISH ABSTRACT : Near infrared femtosecond laser pulses were generated in the spectral range 900 - 2400 nm using the idler of a noncollinear optical parametric amplifier (NOPA). The amplitude and phase of four exemplary ...
    • A new femtosecond electron diffractometer for structural dynamics experiments at cryogenic temperatures 

      Smit, Albert Bart (Stellenbosch : Stellenbosch University, 2014-12)
      ENGLISH ABSTRACT: In this thesis, a femtosecond electron diffraction (FED) set-up that is capable of investigating the photo-induced switching of Cu(DCNQI)2 from being an insulator to being a conductor is presented. ...
    • A non-commutative walecka model as an effective theory for interacting nucleons of finite size 

      Groenewald, Hendrikus Wilhelm. (Stellenbosch : Stellenbosch University, 2012-03)
      ENGLISH ABSTRACT: The nite size of nucleons should play an important role in the description of high density nuclear matter as found in astro-physical objects. Yet we see that the Walecka model, which is generally used ...
    • Non-linear effects in quantum electrodynamics 

      Kohler, Shane Jerome (Stellenbosch : University of Stellenbosch, 2010-12)
      ENGLISH ABSTRACT: See abstract in full text
    • Non-perturbative flow equations from continuous unitary transformations 

      Kriel, Johannes Nicolaas (Stellenbosch : University of Stellenbosch, 2005-12)
      The goal of this thesis is the development and implementation of a non-perturbative solution method for Wegner’s flow equations. We show that a parameterization of the flowing Hamiltonian in terms of a scalar function ...
    • Noninvasive measurement of dynamic correlations in spin systems 

      Uhrich, Philipp Johann (Stellenbosch : Stellenbosch University, 2017-12)
      ENGLISH ABSTRACT : Dynamic correlations hψ| O1(t1)O2(t2)|ψi of quantum observables are useful quantities for the study of quantum dynamics. Attempts at measuring these correlations are however complicated, due to the ...
    • Nuclear reactions with polarized spin-1/2 beams 

      Hillhouse, G. C. (Gregory Campbell) (Stellenbosch : Stellenbosch University, 1990-03)
      ENGLISH ABSTRACT: The first part of the thesis deals with the subject of polarization in nuclear reactions. The case where the incoming beam is polarized, is emphasized, and the theory is developed for the simple and ...
    • 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
    • Numerical modelling of the excitation of polyatomic molecules by femtosecond laser beams 

      De Clercq, Ludwig Erasmus (Stellenbosch : University of Stellenbosch, 2011-03)
      ENGLISH ABSTRACT: The selective excitation of an arbitrary vibrational level of a polyatomic molecule, without passage through an intermediary electronic excited state is demonstrated. This was achieved by simulating the ...