Recent Submissions

  • Evidence estimation using stochastic likelihood approximations 

    Cameron, Scott (Stellenbosch : Stellenbosch University., 2020-04)
    ENGLISH ABSTRACT: We consider the problem of estimating evidence for parametric Bayesian models in the large data regime. Many existing evidence estimation algorithms scale poorly due to their need to repeatedly calculate ...
  • The analysis of multi-clustering in heavy nuclei 

    Carolus, Timothy Gary (Stellenbosch : Stellenbosch University., 2020-04)
    ENGLISH ABSTRACT: The binary cluster model is the simplest mathematical model which is used to describe a system of strongly interacting, and highly correlated nuclear matter. This study will serve as a means to better ...
  • 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 ...
  • Probabilistic graphical modelling of seismic data processing in mining 

    Du Toit, Cornel (Stellenbosch : Stellenbosch University., 2020-04)
    ENGLISH ABSTRACT: Mining has long been characterised by deep shafts and dangerous conditions. Accurate monitoring and prediction of seismic activity and rockfalls are matters of life and death. The Institute of Mine ...
  • 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, ...
  • Single molecule diffusion in polymeric systems 

    Sibanda, Charmaine (Stellenbosch : Stellenbosch University, 2019-04)
    ENGLISH ABSTRACT : The dynamics of thin polymeric systems were studied in this research work using the diffusion of single fluorescent molecules observed by single molecule fluorescence microscopy. A wide field single ...
  • Spectroscopy of atomic zinc inside a heat pipe: Towards resonance ionisation 

    Hattingh, Brandon Dane (Stellenbosch : Stellenbosch University, 2019-04)
    ENGLISH ABSTRACT : Zinc (Zn) reserves in South Africa are not being used to full potential. Separating Zn into its different stable isotopes drastically increases its value, as well as usefulness in certain areas such ...
  • Thermalisation of a two-species condensate coupled to a bosonic bath 

    Louw, Jan Cillié (Stellenbosch : Stellenbosch University, 2019-04)
    ENGLISH ABSTRACT : Motivated by recent experiments, we study the time evolution of a two-species Bose-Einstein condensate which is coupled to a bosonic bath. For the particular condensate, unconventional thermodynamics ...
  • 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 ...
  • Towards atomic physics using spatially structured light 

    Webster, Jason (Stellenbosch : Stellenbosch University, 2018-12)
    ENGLISH ABSTRACT : Structured light has seen many applications in the fields of telecommunications, optical microscopy, and quantum information processing, however, few works exist that explore the interactions of ...
  • Optical tweezers for advanced microscopy 

    Erasmus, Anneke (Stellenbosch : Stellenbosch University, 2018-03)
    ENGLISH SUMMARY: The integration of lasers into microscopy has enabled new areas of research and expanded existing ones. Not only can one now image samples to resolutions and contrast unheard of before lasers became ...
  • 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 ...
  • Bayesian parameter estimation for discrete data spectra 

    Wang, Li (Stellenbosch : Stellenbosch University, 2017-12)
    ENGLISH ABSTRACT : Discrete spectra are ubiquitous in physics; for example nuclear physics, laser physics and experimental high energy physics measure integer counts in the form of particles in dependence of angle, ...
  • 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 ...
  • Studying the structural phase transition of organic Cu(DCNQI)2 with ultrafast electron diffraction 

    Payne, Nancy (Stellenbosch : Stellenbosch University, 2017-12)
    ENGLISH ABSTRACT : Organic molecular solids combine the richness of molecular and solid state physics. The structure and properties of organic solids can be modified to a great extent—for example, by utilising isotope ...
  • Computing the Arnold Tongue in the Zipoy-Voorhees Space-time 

    Sherif, Abbas Mohamed (Stellenbosch : Stellenbosch University, 2017-03)
    ENGLISH ABSTRACT : In this thesis I study the integrability of the geodesic equations of the ZipoyVoorhees metric. The Zipoy-Voorhees spacetime is a one parameter family of Stationary Axisymmetric Vacuum spacetimes (SAV’s) ...
  • 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 ...
  • 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 ...
  • Supercontinuum pulse characterisation and compression 

    Viljoen, Ruan (Stellenbosch : Stellenbosch University, 2017-03)
    AFRIKAANSE OPSOMMING : In hierdie projek word die infrastruktuur van 'n hoë-resolusie nie-lineêre mikroskoop ontwikkel. Spesifiek word daar gekyk na generering van breëband lig deur middel van 'n fotoniese-kristalvesel ...
  • Fluorescence and self-absorption free excitation spectroscopy of carbon monoxide isotopomers in the vacuum ultraviolet 

    De Bruyn, Andre (Stellenbosch : Stellenbosch University, 2017-03)
    ENGLISH ABSTRACT : Carbon Monoxide (CO) is the most abundant heteronuclear diatomic molecule in the universe and has been of great interest in the fields of astrophysics and astronomy. CO is additionally, a prototype ...

View more