Masters Degrees (Physics)
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The search for high-energy gamma-ray emission from the close binary system AR Scorpii using Fermi-LAT data
(University of the Free State, 2021-10)AR Scorpii (AR Sco) is an enigmatic close binary system which is observable across most of the electromagnetic spectrum. Multi-wavelength emission consists of both thermal and non-thermal components, where pulsed non-thermal ... -
The search for pulsed radio and gamma-ray emission from the cataclysmic variable system AE Aquarii using MeerKAT and Fermi-LAT data
(University of the Free State, 2021-12)The nova-like AE Aquarii was extensively studied using 11 years of data and contemporaneous optical data with the aim to establish pulsed gamma-ray emission at the rotational period (33.08 s) of the white dwarf and the ... -
Synthesis and characterization of long afterglow phosphors (Sr Al2iO4:Ce3+ SrAl2iO4:Tb3+CaAlxOy:Tb3+, Y3Al5O12:Eu3+) using solution combustion method
(University of the Free State, 2011-11)This work consists of several aspects of phosphor materials. Strontium, calcium and yttrium aluminate doped with rare earth (Ce, Tb and Eu) have been synthesized by solution combustion method using urea as a fuel for ... -
Synthesis and characterization of undoped and doped ZnO nanoparticles prepared by sol-gel process
(University of the Free State, 2009-11)Nanotechnology is an emerging field of engineering that has intrigued a tremendous potential to change today's lives. Nanoparticles represent the transition region between individual atom/molecule and bulk materials have ... -
Room temperature gas sensing characteristics of titanium dioxide nanostructures: effects of hydrochloric acid on the structure and magnetic properties
(University of the Free State, 2016-01)Monitoring and detection of toxic and combustible gases such as methane in underground mining, carbon monoxide from burning coal in our homes and odourless gases such as nitrogen dioxide and sulphur dioxide in industries ... -
'n Ondersoek na die segregasie van fosfor en ander onsuiwerhede in 3Cr12 vlekvrye staal
(University of the Free State, 2003-11)English: One of the main reasons for temper embrittlement in steel is the segregation of impurities like P to the grain boundaries. Segregation can be defined as the diffusion of atoms from the bulk to the surface and ... -
A comparative study between the simulated and measured cathodoluminescence generated in ZnS phosphor powder
(University of the Free State, 2003-08)In the past few decades cathode ray tubes (CRTs) have dominated the display market because of their excellent image quality, ease and economy of manufacture. However their bulky packaging and high power consumption make ... -
An investigation of variability and its associated synchrotron emission in relativistic AGN jets using numerical hydrodynamic simulations
(University of the Free State, 2017-03)English: Active regions at the centres of certain galaxies known as Active Galactic Nuclei (AGN) are some of the most energetic and violent sources of emission in the universe. Certain types of AGN can produce jet-like ... -
Study of the structure, particle morphology and optical properties of mixed metal oxides
(University of the Free State, 2017-01)The structure, morphology and optical properties of metal oxides (ZnO, MgO and SrO), their composites (MgO-ZnO, SrO-ZnO) and systems with different x molar concentration values (0.2, 0.4, 0.5, 0.6, 0.7, 0.8) of MgxZn1-xO ... -
Oxidation of a segregated MoN layer grown on Fe(100)-3.5wt%Mo-N
(University of the Free State, 2001-06)English: The oxidation behaviour of the segregated MoN layer on the Fe(100)-3.5wt% Mo-N substrate was investigated in this study. Previous studies suggested the synergetic segregation of the Mo and N from the Fe(100)-3.5wt% ... -
A multi-wavelength study of super soft X-ray sources in the Magellanic Clouds
(University of the Free State, 2012-02)English: Supersoft X-ray Sources (SSS) form Cl, highly luminous class of objects that emit more Than ~ 90% of their energy in the supersoft X-ray band, i.e. below 0.5 keV. They are generally believed to consist of a white ... -
Mode identification in delta δ Scuti stars
(University of the Free State, 1998-10)This thesis discusses mode-identification from multicolour photometry. First, the need for a better mode identification technique for stars that have significant phase differences between the light curves in different ... -
The determination of ternary segregation parameters using a linear heating method
(University of the Free State, 2000-11)In this study the segregation behaviour of the ternary system Cu(lll ), Sb, Sn is investigated experimentally, as well as with the modified Darken segregation model. The model, which describes the kinetics as well as the ... -
Bepaling van die elastisiteitskonstantes van yster enkel-kristalle
(University of the Free State, 1966-10)Abstract not available -
Magnetic, luminescence and gas sensing properties of various zinc oxide nanostructures: the influence of surface modification by gold on the gas sensing properties
(University of the Free State, 2016-01)Various morphologies of zinc oxide (ZnO) including particles, spheres, flowers and sheets achieved by varying the pH from 7 to 13 were successfully synthesized using the microwave-assisted hydrothermal method. Effect of ... -
Luminescent properties of combustion synthesized BaAl₂O₄:Eu²⁺ and (Ba₁₋xSrx)Al₂O₄:Eu²⁺ phosphors co-doped with different rare earth ions|
(University of the Free State, 2011-11)Combustion method was used to prepare all the alkaline earth aluminates (rare-earths doped BaAl2O4, BaSrAl2O4 and BaZnAl2O4) phosphor powders in this study. Measurements of these phosphor powders were carried out using ... -
Low-cost thermoluminescence measurement using photodiode sensing
(University of the Free State, 2015-05)Many branches of scientific and industrial research require precise instrument(s) for control and measurement. Such instruments tend to be prohibitively expensive. In the current global economic climate the funding to ... -
Narrowband Ultraviolet B emission from gadolinium and praseodymium co-activated calcium phosphate phosphors for phototherapy lamps
(University of the Free State, 2014-01)Different phases of calcium phosphates co-doped with gadolinium and praseodymium were prepared by co-precipitation, urea combustion, citrate-gel combustion and microwave-assisted methods. Ca5(PO4)3OH:Gd3+,Pr3+ phosphors ... -
An investigation into the nature of the relativistic compact object in the micro-quasar system LS 5039 : a multi-wavelength study
(University of the Free State, 2007-11-30)English: LS 5039 is a high mass binary system that shows multi-wavelength broad non-thermal emission. It is also a very high energy gamma-ray emitter, with TeV energy gamma-rays detected by H.E.S.S. (High Energy Stereoscopic ... -
Simulating the formation of Pt nanostructures utilizing molecular dynamic calculations
(University of the Free State, 2014)Platinum (Pt) is an important catalyst for applications such as catalytic converters. In this thesis the formation of platinum nanoparticles was investigated by means of simulations. For the first part of the thesis a ...
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