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Theses and Dissertations (Physics): Recent submissions
Now showing items 81-100 of 194
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(University of Pretoria, 2019)The main aim of this project is to develop a simple, yet mathematically rigorous, version of Tomita-Takesaki theory for the von Neumann algebra B(H ) with a faithful normal state. In Chapter 2 we formulate the theory in ...
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(University of Pretoria, 2019)In this thesis, different vanadium-based materials and vanadium/carbon composites were synthesized and explored as active electrode materials for supercapacitor application. The major goal of this study was to incorporate ...
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(University of Pretoria, 2019)In this thesis, density functional theory (DFT) calculations are performed to study the transition metal and chalcogen alloying of a molybdenum disul de (MoS2) monolayer for band gap engineering. The e ects of the foreign ...
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(University of Pretoria, 2019)A femtosecond transient absorption spectroscopy system was developed and used to characterize the charge-transfer processes which take place between photo-excited porphyrin and C60-fullerene supramolecular donor-accept ...
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(University of Pretoria, 2018)Coherent control and transient absorption spectroscopy techniques have been used widely in biophysics to manipulate and study ultrafast molecular dynamics such as excitation energy transfer, internal conversion and ...
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(University of Pretoria, 2019)Silicon carbide has become an important material in the implementation of next generation photonics. It harbors the silicon vacancy (VSi) which can be transformed to a carbon antisite-vacancy pair (CSiVC) defect through ...
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(University of Pretoria, 2019)Defects in semiconductors have been studied extensively over the past few decades. The advent of highly sensitive techniques such as deep-level transient spectroscopy (DLTS) and Laplace DLTS (LDLTS) has resulted in more ...
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(University of Pretoria, 2018)Silicon and indium tin oxide (ITO) are the active components of the modern day devices. ITO is the most used transparent conducting material (TC) in smartphones and other touch panel devices, because the required properties ...
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(University of Pretoria, 2018)In this study, the effect of the inclusion of a hydrothermal pre-treatment procedure and varying the mass ratios of the raw material and the activating agents on the electrochemical performance of laboratory-synthesized ...
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(University of Pretoria, 2019)The study of higher spin gravity theories has gathered much interest in recent years. In three dimensions, these theories are particularly tractable due to the fact that they can be de ned in terms of a Chern-Simons ...
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(University of Pretoria, 2019)The primary goal of this thesis is the study of the 1-loop partition function of critical topologically massive gravity, a theory conjectured to be dual to a logarithmic conformal field theory through the AdS3/LCFT2 ...
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(University of Pretoria, 2019)The measurement of spectral irradiance in the ultraviolet (UV) region of the electromagnetic spectrum has higher uncertainties largely due to a low signal-to-noise ratio (SNR). UV-C radiation emitted by low pressure (LP) ...
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(University of Pretoria, 2019)Ions with different energies have been used to modify the properties of semiconductors. In particular, these modifications have included altering the electrical properties of semiconductors. The ion-solid interactions ...
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(University of Pretoria, 2018)Recent research efforts are focused on alternative energy production instead of fossil fuels. Meanwhile, the developments of more efficient energy storage devices are driven by many factors. One is related to our environment. ...
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(University of Pretoria, 2018)The aim of this study is to synthesize and characterize cheap, efficient and high-performance 3D activated carbon (AC) from cork (Quercus Suber) by KOH and KHCO3 activation respectively, Co-Mn LDH and MnO2-CNT nanocomposite ...
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(University of Pretoria, 2017)Generation IV high temperature nuclear reactors use TRISO (tristructural isotropic) particles for containment of radioactive fission products. In these particles silicon carbide (SiC) is the main barrier for containing ...
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(University of Pretoria, 2017)Due to an urgent need for efficient, clean, and sustainable sources of energy, as well as new technologies associated with energy conversion and storage, the most effective and practical technologies for electrochemical ...
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(University of Pretoria, 2017)Recent advances in semiconductor growth techniques have led to the production of high quality Ge that plays a vital role in the fabrication of electrical devices. Germanium (Ge) is mainly used as a detector material being ...
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(University of Pretoria, 2017)The release of radioactive fission products during nuclear energy reactor operation imposes a serious danger to personnel’s health and the environment. In a modern Pebble Bed Modular Reactor (PBMR) TristructuralIsotropic ...
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(University of Pretoria, 2017)First discovered by E.T. Hall in 1879 [1], the Hall Effect is a phenomena that explains the behaviour of a material placed in a magnetic field and a current is allowed to flow through the material, producing an electric ...
Now showing items 81-100 of 194