Browsing Faculty of Natural Science by Title
Now showing items 2067-2086 of 2562
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A robust audio-based symbol recognition system using machine learning techniques
(University of the Western Cape, 2020-02)This research investigates the creation of an audio-shape recognition system that is able to interpret a user’s drawn audio shapes—fundamental shapes, digits and/or letters— on a given surface such as a table-top using a ... -
Robust computational methods for two-parameter singular perturbation problems
(University of the Western Cape, 2010)This thesis is concerned with singularly perturbed two-parameter problems. We study a tted nite difference method as applied on two different meshes namely a piecewise mesh (of Shishkin type) and a graded mesh (of Bakhvalov ... -
Robust computational methods to simulate slow-fast dynamical systems governed by predator-prey models
(University of the Western Cape, 2019)Numerical approximations of multiscale problems of important applications in ecology are investigated. One of the class of models considered in this work are singularly perturbed (slow-fast) predator-prey systems which ... -
Robust facial expression recognition in the presence of rotation and partial occlusion
(University of Western Cape, 2014)This research proposes an approach to recognizing facial expressions in the presence of rotations and partial occlusions of the face. The research is in the context of automatic machine translation of South African Sign ... -
Robust numerical methods to solve differential equations arising in cancer modeling
(University of the Western Cape, 2020)Cancer is a complex disease that involves a sequence of gene-environment interactions in a progressive process that cannot occur without dysfunction in multiple systems. From a mathematical point of view, the sequence ... -
Robust recognition of facial expressions on noise degraded facial images
(University of the Western Cape, 2011)We investigate the use of noise degraded facial images in the application of facial expression recognition. In particular, we trained Gabor+SVMclassifiers to recognize facial expressions images with various types of noise. ... -
Robust South African sign language gesture recognition using hand motion and shape
(2014)Research has shown that five fundamental parameters are required to recognize any sign language gesture: hand shape, hand motion, hand location, hand orientation and facial expressions. The South African Sign Language ... -
Robust Spectral Methods for Solving Option Pricing Problems
(University of the Western Cape, 2012)Robust Spectral Methods for Solving Option Pricing Problems by Edson Pindza PhD thesis, Department of Mathematics and Applied Mathematics, Faculty of Natural Sciences, University of the Western Cape Ever since the ... -
Rock art in the Northern Cape: the implications of variability in engravings and paintings relative to issues of social context and change in the precolonial past
(2012)This thesis follows and builds upon a previous study at the rock engraving site of Driekopseiland (Morris 2002). The earlier findings are here contrasted with another site in the area, namely Wildebeest Kuil, as a means ... -
The role of aluminium content in the control of the morphology of fly ash based hierarchical zeolite X
(University of the Western Cape, 2015)Coal is the main source of electricity in South Africa, the combustion of which produces a large amount of waste (coal fly ash) annually. The large-scale generation of coal fly ash places major strain on landfills and the ... -
The role of c-reactive protein as a marker for preterm delivery
(University of Western Cape, 2020)Pregnancy associated maternal morbidity and mortality along with adverse pregnancy outcomes have gained momentum over the past few years, particularly in Sub-Saharan Africa and Southern Asia despite the advances in medical ... -
The role of grazers and basal sustrate cover in the control of intertidal algal distribution
(University of the Western Cape, 2006)This study investigated the role of grazing as a possible cause for the upper limit of distribution of algae on a typical South African south coast. -
The role of high-risk human papillomavirus in periocular cancers
(University of the Western Cape, 2018)PURPOSE: High risk human papillomavirus (HR-HPV) is well established as a causative agent of squamous cell carcinoma (SCC) of the orophaynx. HR-HPV has also been reported in periocular cancers and precancers, but controversy ... -
The role of high-risk human papillomavirus in periocular cancers
(University of the Western Cape, 2018)Purpose: High risk human papillomavirus (HR-HPV) is well established as a causative agent of squamous cell carcinoma (SCC) of the orophaynx. HR-HPV has also been reported in periocular cancers and precancers, but controversy ... -
The role of p-coumaric acid on physiological and biochemical response of chia seedling under salt stress
(University of the Western Cape, 2020)The role of phenolic acids in mitigating salt stress tolerance have been well documented. However, there are contradicting reports on the effect of exogenously applied phenolic acids on the growth and development of various ... -
Role of Rutin in 1-Mtthyl-4-Phenylpyridinium toxicity: Therapeutic implications for Parkinson's disease
(University of the Western Cape, 2018)Parkinson’s disease (PD) is a common neurodegenerative disorder characterized by the progressive loss of dopaminergic neurons in the substantia nigra pars compacta of the midbrain. Although the etiology of PD is not ... -
The role of salt tectonics in the hydrocarbon potential of the post-salt deposits (albian to recent), offshore Gabon
(University of the Western Cape, 2014)Following successful discovery and production of hydrocarbons, Gabon is one of the key hydrocarbon target countries in Africa. Located in the Lower Congo Basin, the study area is based in Etame Marin Permit (EMP), which ... -
The role of salt tectonics in the hydrocarbon potential of the post-salt deposits (Albian to Recent), offshore Gabon
(University of Western Cape, 2014)Following successful discovery and production of hydrocarbons, Gabon is one of the key hydrocarbon target countries in Africa. Located in the Lower Congo Basin, the study area is based in Etame Marin Permit (EMP), which ... -
The role of surface modified TiO2 nanoparticles for application in 68Ge/68Ga generator systems and the use of molecular imprinted polymers for 68Ge breakthrough control
(University of Western Cape, 2021)Titanium dioxide (TiO2) has potential as an adsorbent within the 68Ge/68Ga generator context. To function effectively, three basic requirements are required: optimum 68Ga elution efficiency, stability and removal of the ... -
The role of visualization in the teaching and learning of multivariate calculus and systems of ordinary differential equations
(University of the Western Cape, 2015)The purpose of this study was to investigate the role of visualization in the conceptualisation and solution of problems in multivariate calculus and dynamical systems. The theoretical basis, and the visual and analytical ...