• 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. ...
    • Short-pulse generation in a diode-end-pumped solid-state laser 

      Ngcobo, Sandile (Stellenbosch : University of Stellenbosch, 2010-03)
      ENGLISH ABSTRACT: This thesis consists of two parts; the first part is a discussion on the detailed history of the development of different types of modelocked lasers, especially the neodymium-doped lasers. The second ...
    • 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 ...
    • 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 ...
    • Spectral characteristics of stimulated Raman scattered radiation in a waveguide 

      Du Plessis, Johann Altenburg (Stellenbosch : Stellenbosch University, 1992-01)
      ENGLISH ABSTRACT: The spectral characteristics of stimulated Raman scattered radiation in a waveguide was investigated using a laser as source of pump radiation. The pump laser is focused into the waveguide to obtain a ...
    • Spectral characterization of materials using terahertz time domain spectroscopy (THz-TDS) 

      Hissen, Huzifa Zain Alabdeen Abdarahman (Stellenbosch : Stellenbosch University, 2014-12)
      ENGLISH ABSTRACT: Terahertz (THz) radiation is often used in many promising applications such as information and communication technology and airport security. Optimized and adapted terahertz fields hold huge promise for ...
    • 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 ...
    • 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 specifc heat and negative magnetic susceptibility, and show how they can be related ...
    • Strange particle production via the weak interaction 

      Adera, Gashaw Bekele (Stellenbosch : University of Stellenbosch, 2009-03)
      In this thesis a general relativistic formalism for neutrino-induced weak production of strange particles is presented. In our formalism it is shown that the differential cross section is constructed as a contraction ...
    • Structural dynamics of 1T-TiSe2 using femtosecond electron diffraction 

      Suleiman, Aminat Oyiza (Stellenbosch : Stellenbosch University, 2014-12)
      ENGLISH ABSTRACT: Trilayered transition metal dichalcogenides such as our sample (1T-TiSe2) have been studied for many years as systems with strong electron-electron and electron-phonon correlations. The main attraction ...
    • Study of fusion evaporation channels in the 18O + 18O reaction at 65 MeV 

      Khaleel, Esra Ahmed Mohammed Adam (Stellenbosch : Stellenbosch University, 2011-12)
      ENGLISH ABSTRACT: See full text for abstract
    • 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 ...
    • 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 ...
    • Superconductivity problems with multiple Ginzburg-Landau order parameters 

      Geyer, Jani (Stellenbosch : Stellenbosch University, 2011-12)
      ENGLISH ABSTRACT: Two problems in the field of materials-based condensed matter physics, specifically in the field of superconductivity, are studied theoretically. In both problems, where each is of current exper- imental ...
    • 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 ...
    • Surface enhanced Raman spectroscopy (SERS) of amino acids 

      Pfukwa, Ngaatendwe Buhle Cathrine (Stellenbosch : Stellenbosch University, 2016-03)
      ENGLISH ABSTRACT : Raman spectroscopy (RS) is an invaluable technique for sample identification. This method requires little sample preparation and is not completely non-invasive. The intensity of Raman scattered light can ...
    • 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 ...
    • Test of fast neutron detectors for spectroscopy with (3He,n) two proton stripping reactions 

      Elbasher, Mohamed Elbasher Ahmed (Stellenbosch : Stellenbosch University, 2012-03)
      ENGLISH ABSTRACT: Nine 100x100x600 mm3 plastic scintillators, formerly built for the neutron time of ight measurements at iThemba LABS, were refurbished. The position resolution of these detectors was determined using ...