Browsing School of Chemistry and Physics by Title
Now showing items 668-687 of 705
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Thermal transformation of organoboranes : applicability of ¹¹B NMR spectroscopy and supporting molecular modelling.
(2008)The high temperature transformations of trialkylboranes were investigated in the range: 50- 200 ºC. The extent of dealkylation was found to be linked to temperature with ca. 10% octene liberation from tri-n-octylborane at ... -
The thermodynamics of complexation of the ligand KELEX 100 with various metal ions.
(1995)The experimental work conducted in this thesis was aimed at determining the thermodynamic quantities associated with the formation of complexes formed between various metal ions and KELEX 100, a ligand which is used ... -
The thermodynamics of liquid mixtures : an investigation into the low temperature bleaching of a cotton non- woven fabric using hydrogen peroxide.
(1993)This thesis is presented in two parts. In part one, the excess molar volumes and the excess molar enthalpies have been determined for several binary systems at 298.15 K using an LKB flow microcalorimeter and/or a 2277 ... -
Thermodynamics of liquid mixtures : experimental and theoretical studies on the thermochemical and volumetric behaviour of some liquids and liquid mixtures.
(1996)The excess molar volumes VEm and the excess molar enthalpies HEm have been determined for several binary systems at 298.15 K using an Anton Paar Digital Densitometer and a 2277 Thermal Activity Monitor, respectively. VEm ... -
Thermodynamics of liquid mixtures containing carboxylic acids.
(2003)The thesis involves a study of the thermodynamics of ternary liquid mixtures involving carboxylic acids with nitriles, hydrocarbons including cycloalkanes, and water. Carboxylic acids are an important class of compounds ... -
Thermodynamics of liquid mixtures containing N-methyl-2- pyrrolidone.
(1997)This thesis involves a study of the thermodynamics of liquid mixtures containing N-methyl-2pyrrolidone (NMP) and hydrocarbons or ethers. NMP is a polar liquid which is used in liquid extraction procedures for the separation ... -
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) ...