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Browsing Masters by Faculty "Faculty of Science"

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1+1+2 covariant approach to gravitational lensing in f(R) gravity

Author: Nzioki, Anne Marie Date: 2009 In this thesis, we develop the 1 + 1 + 2 formalism, a technique originally devised for General Relativity, to treat spherically symmetric spacetimes in for fourth order theories of gravity. Using this formalism, we derive equations for a ... Read more
A 14C and 15N study of the effects of ammonium or nitrate nutrition on carbon allocation in Triticum aestivum L. and Zea mays L

Author: Van der Leij, Martina Date: 1991 The poor response of some plant species, e.g. wheat, to ammonium nutrition has been attributed to a diversion of carbon allocation from structural material for root extension to functions associated with the assimilation and translocation of ... Read more
An 15N study of the effects of nitrate, ammonium, and nitrate + ammonium nutrition on nitrogen assimilation in Zea Mays L.

Author: Murphy, Andrew Telfer Date: 1984 A brief review of the literature on the effects of nitrate and ammonium nitrogen sources on plant growth, and the assimilation of those nitrogen sources, has been presented. A water culture technique for the growth of maize was developed. The ... Read more
A 3D fault seal analysis study conducted in the Ibhubesi Gas Field Offshore the West Coast of South Africa

Author: Ntombela, Nondumiso Date: 2018 A three dimensional fault seal analysis study of the AK fault situated offshore of the West Coast of South Africa is presented. This study is aimed at informing the development plan of the Ibhubesi gas field with regards to the compartmentalization ... Read more
3D Scan Campaign Classification with Representative Training Scan Selection

Author: Pocock, Christopher Date: 2019 Point cloud classification has been shown to effectively classify points in 3D scans, and can accelerate manual tasks like the removal of unwanted points from cultural heritage scans. However, a classifier’s performance depends on which ... Read more
4000 years of environmental and climate change at Eilandvlei : a palynological investigation into the late Holocene palaeoenvironment of the Wilderness Embayment

Author: Du Plessis, Nadia Date: 2015 It is a well-known fact that the South African palaeoenvironmental record is fairly limited, mainly because the environmental conditions here do not lend themselves to the preservation of proxy data sources. This being said, new evidence is ... Read more
45000 years of hunter-gatherer history as seen from Umhlatuzana Rock Shelter

Author: Kaplan, Jonathan Michael Date: 1989 Umhlatuzana Rock Shelter in Natal was excavated in 1985. A long and detailed sequence of stone artefacts was recovered. These artefacts covered the time range from the Middle Stone Age (MSA) to the Later Stone Age (LSA). The excavations ... Read more
4D seismic analysis: discriminating between saturation and pressure changes form a data acquired Offshore Equatorial Guinea

Author: Msolo, Andile Lucky Date: 2017 4D seismic analysis is used to understand the performance of a producing oil field in order to increase production and mitigate risk. This is done by interpreting changes in water saturation and changes in effective pressure in the reservoir, ... Read more
A baited remote underwater video survey of the Goukamma Marine Protected Area's ichthyofauna and a subsequent community structure comparison with the Betty's Bay, Stilbaai, and Tsitsikamma Marine Protected Areas

Author: Dando, Jackson Willy Date: 2020 The Goukamma Marine Protected Area (GMPA) along the South African south coast has been in existence since 1990. The MPA encompasses 40.2 km2 of subtidal ocean, 76% of which is made up of sandy substrata and the remainder of which is made of ... Read more
A camera trap assessment of factors influencing leopard (Panthera pardus) habitat use in the Nouabalé-Ndoki National Park, Republic of Congo

Author: Mavinga, Franck Barrel Date: 2018 Leopards (Panthera pardus) are faced with increasing levels of anthropogenic pressure resulting in population declines across much of their historical range. While there is relatively limited knowledge of leopards occurring in African rain ... Read more
A CMIP5 Model Selection Specific to South Africa's Winter Rainfall Zone

Author: Marsh, Peter Date: 2022 This study undertakes a CMIP5 model selection specific to the Winter Rainfall Zone (WRZ) of South Africa, seeking to reduce the range of future climate projections through identifying a subset of models with increased realism and independence. ... Read more
A comparative study between the cubic spline and b-spline interpolation methods in free energy calculations

Author: Kaya, Hikmet Emre Date: 2020 Numerical methods are essential in computational science, as analytic calculations for large datasets are impractical. Using numerical methods, one can approximate the problem to solve it with basic arithmetic operations. Interpolation is a ... Read more
A comparative study of recurrent neural networks and statistical techniques for forecasting the stock prices of JSE-listed securities

Author: Galant, Rushin Date: 2022 As machine learning has developed, the attention of stock price forecasters has slowly shifted from traditional statistical forecasting techniques towards machine learning techniques. This study investigated whether machine learning techniques, ... Read more
A comparison of a factor-based investment strategy and machine learning for predicting excess returns on the JSE

Author: Drue, Stefan Date: 2018 This study investigated the application of Machine Learning to portfolio selection by comparing the application of a Factor Based Investment strategy to one using a Support Vector Machine performing a classification task. The Factor Based ... Read more
A comparison of mobile search interfaces for isiXhosa speakers

Author: Modise, Morebodi Date: 2018 Search interfaces have for a long time been targeted at the resource-rich languages, such as English. There has been little effort to support African (Bantu) languages in search interfaces when compared to languages such as English, particularly ... Read more
A computational study of acidic Ionic Liquids for cellobiose hydrolysis in ionic liquids

Author: Nel, Jessica Lisé Date: 2019 The current environmental situation, with respect to global warming and the ever– approaching depletion of fossil fuel sources, places significance on the development of green fuel and platform chemical production methods. In this context, ... Read more
A flood of communications in a drought: a frame analysis of the City of Cape Town's communications during the 2017-2018 water crisis

Author: Hill, Erin Date: 2020 Like many other urban areas around the world, Cape Town, South Africa relies on governmental management authorities to ensure water supply. Recently, a three year drought from 2015 to 2018 caused a major water shortage, threatening water ... Read more
A genetic perspective on leopard (Panthera pardus) conservation units across southern Africa

Author: Thacker, Thomas M Date: 2021 Conservation units are a tool to guide policy such that conservation goals can be achieved. These units should ideally synthesise a wide array of data – genetic, ecological, demographic – to identify the appropriate scales at which conservation ... Read more
A GLMM analysis of data from the Sinovuyo Caring Families Program (SCFP)

Author: Nhapi, Raymond T Date: 2018 We present an analysis of the data from a longitudinal randomized control trial that assesses the impact of an intervention program aimed at improving the quality of childcare within families. The SCFP was a group-based program implemented ... Read more
A Lagrangian formulation of a theory of a scalar field superfluid dark matter

Author: Tema, Seturumane Date: 2022 In this thesis we discuss the dynamics of the relativistic Lagrangian of the theory of dark matter superfluidity. The second and third chapters of the thesis are a review. In the fourth chapter we show that a complex scalar field whose dynamics ... Read more

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