Browsing School of Chemistry and Physics by Title
Now showing items 674-693 of 705
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Title: Study of anomalous VLF perturbations in possible relation to seismic activity.
(2011)Anomalous perturbations of the ionosphere have been observed either as uctuations in the critical frequency of the F-region ionosphere, foF2, or as uctuations in the nighttime VLF signals that propagate through the ... -
Total and preferential CO oxidation over solid-solution and supported gold catalysts.
(2015)Abstract available in PDF file. -
Towards novel Au (III) porphyrins : synthesis and characterization of a range of mesotetraalkylporphyrins.
(2007)The principal goal of this work was to synthesize and fully characterize a range of free -
Towards practical quantum cryptography.
(2009)The information society that presides today is dependent on the communication industry to facilitate unintelligible data transfers between authenticated parties. Such requirements have, to date, taken advantage of security ... -
Towards the synthesis of biotinylated boron compounds and 1, 3, 2 benzodiazaboroles derivatives and their application as potential BNCT delivery agents.
(2015)In this study, boron neutrons capture therapy (BNCT) principles which have been reported as the best treatment of glioblastoma multiforme tumors thus far were explored. The aim of this study was to synthesizing boron ... -
Towards the total synthesis of a novel diarylheptanoid.
(2010)Diarylheptanoids are a family of plant metabolites with a characteristic structure of two hydroxylated aromatic rings attached by a linear seven-carbon chain. Diarylheptanoids have mostly been isolated from plants belonging ... -
Toxic compounds in cycads.
(1990)The present-day cycads comprise the diverse, modified, remnants of a much larger group of gymnosperms which flourished in the Mezozoic era. The systematic position that the cycads occupy in the botanical hierarchy is ... -
Tracer diffusion of oxygen in YBa2Cu3O7-x from Monte Carlo simulations of an Ising-type model.
(1998)In the research reported here, a two-dimensional Ising-type model was used to study the tracer diffusion coefficients of oxygen ions in YBa2Cu307-x (YBCO) for various values of oxygen concentration and temperature. The ... -
Transfer hydrogenation of ketones mediated by (Pyrazolylmethyl) pyridine nickel (II) and iron (II) complexes.
(2016)Abstract available in PDF file. -
The transpassive behaviour of the anodic film on Fe-Cr alloys.
(1993)This work was undertaken to investigate the transpassive behaviour of the anodic film on two Fe-Cr alloys, namely Fe18Cr and Fe18Cr2Mo in acidic aqueous media in the pH range 0.5 to 3.8. Two electrochemical techniques were ... -
Transverse modes in porro prism resonators
(2008)This dissertation consists of two main sections. The first is a review of laser resonators using spherical mirrors, and incorporates a physical optics numerical model of a Fabry-Perot laser resonator without gain. The ... -
Tropospheric ozone climatology over equatorial and Southern Africa using climate change parameters.
(2016)Tropospheric ozone climatology over equatorial and southern Africa has been at the core of this study. SHADOZ (Southern Hemisphere ADditional OZonesondes) network data for the period 1998-2013, from Irene (South Africa) ... -
Tuning the reactivity of mononuclear tridentate platinum (II) complexes : a detailed kinetic and mechanistic approach using Azole Nucleophiles.
(2014)The kinetic substitution reactions of two different sets of mononuclear Platinum(II) complexes with heterocyclic bio-relevant azole nucleophiles, viz. Imidazole (Im), 1-methylimidazole (MIm), 1,2-Dimethylimidazole (DIm), ... -
Tuning the steric and electronic parameters of mixed-donor palladium(II) complexes: coordination chemistry, substitution kinetics and biological activities.
(2021)Reactions of 2,6-bis(benzimidazol-2-yl)pyridine (L1), 2,6-bis(benzoxazol-2-yl)pyridine (L2), and 2,6-bis(benzothiazol-2-yl)pyridine (L3) with [Pd(NCMe)2Cl2] in the presence of NaBF4 afforded the corresponding Pd(II) ... -
Turning reactivity of platinum(II) complexes : a kinetic and mechanistic investigation into substitution behaviour of mono-and Dinuclear platinum(II) complexes.
(2012)Systematic kinetic and thermodynamic analyses of the substitution reactions of different Pt(II) complexes with a series of bio-relevant nucleophiles have been investigated as a function of concentration and temperature, ... -
Two-dimensional plasma sheath observations in plasma source ion implantation.
(1996)Plasma Source Ion Implantation (PSII) is the process of implanting high energy ions [10-50 keV] into metallic targets, by pulsing them negatively whilst immersed in a background plasma. PSII achieves surface hardening, ... -
Two-level system coupled to a structured environment - a computational study.
(2015)It is well known that analytical solutions to large complex problems are not tractable. Computational or numerical simulations of these types of systems allow one to investigate regimes where analytical methods fail. In ... -
Ultra low frequency (ULF) waves observed at mid to low latitudes during daytime using low Earth orbit (LEO) satellite and ground-based data.
(2011)The launch of German geoscience satellite CHAMP inspired the increased interest in the study of ultra low frequency waves. In this work data from low Earth orbiting (LEO) German CHAMP satellite and South African ground-based ...