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Theses and Dissertations (Physics): Recent submissions
Now showing items 161-180 of 194
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(University of Pretoria, 2012-11-12)The behaviour of iodine, before and after annealing, in pyrolytic carbon (PyC) has been studied using the Rutherford backscattering spectrometry (RBS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). PyC ...
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(University of Pretoria, 2009-10-29)For direct cycle gas cooled high temperature reactor designs, operating conditions may be limited as a result of excessive maintenance dose rates caused by the 110mAg source term on the turbine. The accurate prediction of ...
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(University of Pretoria, 2012-05-08)Due to their great importance, both from the fundamental and from the practical points of view, it is imperative that the various facets of the concepts of information and entanglement are explored systematically in ...
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(University of Pretoria, 2010-05-26)There are many potential areas for the utilization of GaN-based nitride materials, including ultraviolet photodetectors. Ultraviolet photodetectors are used in the military for missile plume detection and space communications. ...
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(University of Pretoria, 2010-05-26)The electrical properties of ZnO and contacts to ZnO have been investigated using different techniques. Temperature dependent Hall (TDH) effect measurements have been used to characterize the as-received melt grown ZnO ...
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(University of Pretoria, 2009-04-16)Please read the abstract in the dissertation
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(University of Pretoria, 2010)Metal-semiconductor contacts have been widely studied in the past 60 years. These structures are of importance in the microelectronics industry. As the scaling down of silicon-based complementary metal-oxide-semiconductor ...
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(University of Pretoria, 2008-08-20)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2012-10-11)We replaced the classical string theory notions of parameter space and world-time with noncommutative tori and consider maps between these spaces. The dynamics of mappings between different noncommutative tori were studied ...
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(University of Pretoria, 2007-02-06)The bicyclic substrates 1-oxo-2,8-diaryl-2,5,8-triaza-1<font face="symbol">l</font face>5-phosphabicyclo[3.3.0]-octane 3 were studied before. The molecular rearrangement of the alcoholysis product of 3 (the eight-membered ...
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(University of Pretoria, 2007-08-13)A fully automated Temperature Dependent Hall (TDH) measurement setup has been assembled for the purposes of this study. This TDH setup is capable of measuring samples in the 20 K to 370 K temperature range. Sample sizes ...
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(University of Pretoria, 2010-05-26)Defects in semiconductors are crucial to device operation, as they can either be beneficial or detrimental to the device operation depending on the application. For efficient devices it is important to characterize the ...
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(University of Pretoria, 2007-02-02)This study extended existing research on structured problem solving into disadvantaged South African classrooms. Sixteen disadvantaged urban South African high schools participated in a quasi-experimental study to investigate ...
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(University of Pretoria, 2011-02-18)The structural and electronic properties of graphene and graphene-related materials have been intensively investigated using the plane wave based periodic density func- tional theory (DFT). The Vienna ab initio simulation ...
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(University of Pretoria, 2011-07-04)The diffusion of iodine implanted 6H-SiC has been investigated using Rutherford backscattering Spectrometry (RBS). SiC is used as the main barrier in the modern high temperature gas cooled reactors. An understanding of the ...
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(University of Pretoria, 2012-07-16)The magnetic behavior of cubic B20 crystal structure FeSi thin film has been previously probed at macroscopic level using a magnetometer. The results revealed ferromagnetic state with significant hysteresis. This is contrary ...
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(University of Pretoria, 2010-08-11)Quantum systems usually suffer from unavoidable interactions with the environment. In most experiments, it is virtually impossible to isolate the system under study from the environment. It is thus imperative to study and ...
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(University of Pretoria, 2010-07-27)SiC is used as the main diffusion barrier in the fuel spheres of the pebble bed modular reactor (PBMR). The PBMR is a modern high temperature nuclear reactor. However, the release of silver from the fuel spheres has raised ...
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(University of Pretoria, 2007-06-18)Since the development of deep level transient spectroscopy (DLTS) in the 1970’s by Lang and others, the technique has become a powerful analytical tool to characterise the electrical properties of defects in semiconductors. ...
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(University of Pretoria, 2010-09-23)No abstract available.
Now showing items 161-180 of 194