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Psychosocial well-being and the sexual behaviour of orphaned adolescent males in Bizana local municipality

  • Authors: Gqumani, Phumlani
  • Date: 2020
  • Subjects: Teenage boys -- Psychology Youth -- Sexual behavior -- South Africa
  • Language: English
  • Type: Thesis , Masters , MSoc. Sci (Psychology)
  • Identifier: http://hdl.handle.net/10353/18118 , vital:42234
  • Description: The aim of the study was to explore the relationship between the psychosocial wellbeing and the sexual behaviour of orphaned adolescent males. The rationale of the study was to determine out whether the relationship exists between psychosocial wellbeing of orphaned adolescent males and their sexual behaviour (e.g. multiple sexual partners, sexual debut, and unprotected sex). The sample size of the purposively selected participants constituted 201 participants from Grade 07 to Grade 12. The study took place from Bizana Local Municipality, Eastern Cape. The researcher used Statistical Package for Social Sciences. The descriptive analysis and inferential statistics were used to analyse the data. Some of the findings of the study included the following From the hypotheses I drink alcohol and I watch pornography and that is how I learned to have sex, it became apparent that adolescent males who drink alcohol, watched pornography. The alternative hypothesis was confirmed with 8.5% of adolescent males drink alcohol and watch pornography compared to 8.0% who do not drink alcohol but watch pornography. There was no relationship between the hypotheses, my friends are aggressive and commit crime and I started having sex at age 13-16 and 17-20 years as 31. 4% of adolescent males who started having sex at the age of 17-20 years, 1.9% have friends who were aggressive and commit crime compared to 2.9% who started having sex at the age of 13-16 years who have friends who were aggressive and commit crime. Based on the findings of the study, it became clear that some adolescent males are resilient despite their social status and the study may be recommended for future studies.
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  • Date Issued: 2020

Resource Allocation Framework in Fog Computing for the Internet of Things Environments

  • Authors: Vambe, William Tichaona
  • Date: 2020
  • Subjects: Internet of things Cloud computing
  • Language: English
  • Type: Thesis , Doctoral , PhD (Computer Science)
  • Identifier: http://hdl.handle.net/10353/18498 , vital:42575
  • Description: Fog computing plays a pivotal role in the Internet of Things (IoT) ecosystem because of its ability to support delay-sensitive tasks, bringing resources from cloud servers closer to the “ground” and support IoT devices that are resource-constrained. Although fog computing offers some benefits such as quick response to requests, geo-distributed data processing and data processing in the proximity of the IoT devices, the exponential increase of IoT devices and large volumes of data being generated has led to a new set of challenges. One such problem is the allocation of resources to IoT tasks to match their computational needs and quality of service (QoS) requirements, whilst meeting both task deadlines and user expectations. Most proposed solutions in existing works suggest task offloading mechanisms where IoT devices would offload their tasks randomly to the fog layer or cloud layer. This helps in minimizing the communication delay; however, most tasks would end up missing their deadlines as many delays are experienced during offloading. This study proposes and introduces a Resource Allocation Scheduler (RAS) at the IoT-Fog gateway, whose goal is to decide where and when a task is to be offloaded, either to the fog layer, or the cloud layer based on their priority needs, computational needs and QoS requirements. The aim directly places work within the communication networks domain, in the transport layer of the Open Systems Interconnection (OSI) model. As such, this study follows the four phases of the top-down approach because of its reusability characteristics. To validate and test the efficiency and effectiveness of the RAS, the fog framework was implemented and evaluated in a simulated smart home setup. The essential metrics that were used to check if round-trip time was minimized are the queuing time, offloading time and throughput for QoS. The results showed that the RAS helps to reduce the round-trip time, increases throughput and leads to improved QoS. Furthermore, the approach addressed the starvation problem, a phenomenon that tends to affect low priority tasks. Most importantly, the results provides evidence that if resource allocation and assignment are appropriately done, round-trip time can be reduced and QoS can be improved in fog computing. The significant contribution of this research is the novel framework which minimizes round-trip time, addresses the starvation problem and improves QoS. Moreover, a literature reviewed paper which was regarded by reviewers as the first, as far as QoS in fog computing is concerned was produced.
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  • Date Issued: 2020

Financial development, income inequality and poverty: case of a selected SADC countries

  • Authors: Leve, Samkele
  • Date: 2019
  • Subjects: Finance Economic development Income distribution
  • Language: English
  • Type: Thesis , Masters , MCom (Economics)
  • Identifier: http://hdl.handle.net/10353/16918 , vital:40785
  • Description: The financial sector plays a pivotal role in an economy of a country; hence the importance of financial development cannot be underestimated. Financial development is widely regarded as another conduit through which income inequality and poverty can be alleviated, however both theoretical and empirical literature does not reach consensus on the effect of financial development on income inequality and poverty. Against this background, the study empirically examines the effect of financial development on income inequality and poverty in selected Southern African Development Community (SADC) countries, employing the Generalised Method of Moments (GMM) technique for the period 1980 to 2011. Based on the inequalitydecreasing and Mckinnon Conduit effect, two models which link financial sector development and inequality and financial sector development and poverty were estimated using five different dimensions of financial development. Empirical results revealed that financial development overall does have an impact on income inequality and poverty in the selected SADC countries. An interesting observation from the empirical results is that the actual dimension of financial development plays a significant role in determining the relationship between financial development, income inequality and poverty in the SADC region. The impact of financial depth on poverty is not obvious in the study, depending on the variable used. On the relationship between financial system stability, income inequality and poverty, results reveal that a stable financial system is beneficial to the poor. Financial efficiency does not appear to have a significant role in reducing income inequality and poverty in the selected SADC countries. Overall, the findings from the study indicate that financial access or financial inclusion and financial stability is what reduces poverty instead of mere financial sector development at a broader level.
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  • Date Issued: 2019

Assessment of the Eastern Cape Provincial Public Service Commission in promoting public service ethics

  • Authors: Butana, Vulikhaya
  • Date: 2018
  • Subjects: Public administration -- Moral and ethical aspects Civil service ethics Public administration
  • Language: English
  • Type: Thesis , Masters , Public Administration
  • Identifier: http://hdl.handle.net/10353/10295 , vital:35391
  • Description: After the fall of the apartheid government with discriminatory laws and the rise and dawn of democracy in South Africa (SA), the government had to restructure the Public Service (PS). The creation and development of PS legislations and policies to regulate the PS took place. The PSC in 1999 was developed to monitor and steer the operation of the PS. The main objective of this study is to assess the Public Service Commission (PSC) in promoting the professional and ethical environment in the Public Service (PS). The PSC is an independent and impartial body or institution which is mandated by the Republic of South African Constitution of 1996 (Act No.108 of 1996), Public Service Commission Act and the Public Service Act. Chapter ten of the Constitution gives PSC a mandate to ensure that the egalitarian values and principles governing public administration are maintained by government departments, organizations, parastatals and administrations providing the PS, where in this study focus on the promotion of ethics. The methodology used in this study is qualitative research methodology. The study used desktop research where by a data was collected using books, journal articles, academic papers, online information and media reports. The findings of this study highlighted that non-compliance to rules and regulations, lack of policy implementation, limited financial and human resources are still the major problems facing the South African Public Service (SAPS). However, the study recommends that, the PSC must work closely with government departments, promotion of ethics workshops and conferences. In a nutshell, the PSC could improve by developing and regularly reviewing policies, procedures, practices and institutions influencing ethical conduct in the public service.
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  • Date Issued: 2018

Expanded Public Works Programme as a poverty alleviation strategy in Nyandeni local municipality in South Africa : an experiential study

  • Authors: Xhongo, Khanya
  • Date: 2017
  • Subjects: Public works -- South Africa -- Eastern Cape Poverty -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , MSoc
  • Identifier: http://hdl.handle.net/10353/13587 , vital:39682
  • Description: South Africa is faced by huge societal problem of poverty and unemployment, twenty one years after the dawn of democracy. These societal problems have been addressed by policy interventions such as Expanded Public Works Programme. The programme targets Youth, women and people with disabilities. However it appears that the mainstream of the programme the employment creation through infrastructure does not accommodate all the targets especially the disabled. The study sought to investigate the role played by EPWP in alleviating poverty in Nyandeni Municipality and to find out to what extent it really alleviate poverty. The study took a triangulated research paradigm which used both qualitative and quantitative research approaches to collect data from forty eight respondents, by way of in-depth interviews, focus group discussion and questionnaire survey. The study found out that, inter alia, poverty remains high in Nyandeni Local Municipality, there is rampant empowerment exclusion in the area, the wage rate paid to beneficiaries is too little to pull them out of poverty and the effects of poor exiting strategy are unbearable to beneficiaries as they find it hard to find other means of employment once they exit the programme. Some of the recommendations which the study made in line with improved mainstream empowerment security in relation to EPWP are that ,the government needs to improve the information dissemination about proposed interventions to alleviate poverty and that communities should partner with them to alert them about their needs and what best interventions could impact real change. The government should be mobile and take services to people and there should be consideration to review wage rate. The researcher is quite optimistic that the study will play a part in improving policy implementation.
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  • Date Issued: 2017

Factors that influence knowledge management systems to improve knowledge transfer in local government: a case study of Buffalo City Metropolitan Municipality

  • Authors: Ncoyini, Samuel
  • Date: 2017
  • Subjects: Knowledge management -- South Africa -- Eastern Cape Technology transfer -- South Africa -- Eastern Cape Management information systems -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , M Com
  • Identifier: http://hdl.handle.net/10353/1918 , vital:27583
  • Description: The demand for improved service delivery requires new approaches and attitudes from local government. One of the ways this can be achieved is to focus on continuous improvement by driving innovation and lessons learnt from the municipalities’ past successes and failures. For local government authorities to rethink service delivery, they need to find better ways to share information assets, business processes and staff expertise with their citizens and business partners. The lack of Knowledge Management (KM) and, therefore, a low level of information and knowledge transfer in the public services have been identified as two of the main contributors to poor service delivery. The implementation of knowledge transfer process is one of the factors that will impact on the improvement of service delivery. The main purpose of this research study was to investigate how knowledge management systems can be used to improve the knowledge transfer at Buffalo City Metropolitan Municipality (BCMM). The research study focused on knowledge transfer within the Municipality as the general area of research. The objective of this study was to produce critical success factors that would improve knowledge management systems and knowledge transfer among employees at BCMM, which would ultimately improve service delivery.
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  • Date Issued: 2017

Spatial and seasonal distribution of selected persistent organic pollutants and phenolic derivatives along the course of the Buffalo River in the Eastern Cape Province of South Africa

  • Authors: Yahaya, Abdulrazaq
  • Date: 2017
  • Subjects: Organic water pollutants Water -- Purification -- Organic compounds removal
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10353/5939 , vital:29448
  • Description: Persistent organic pollutants (POPs) fall under a group of synthetic chemicals known for their persistence in environmental matrices such as soil and water, and are used in industrial, domestic and agricultural applications. Because of their volatility and lipophilicity, POPs can be transported far away from their point sources and bio-accumulate in food and in fatty tissues of humans and animals. In view of their toxicity and carcinogenicity some organic pollutants such as polychlorinated biphenyl (PCBs), organochlorine pesticides (OCPs) and phenolic derivatives (chlorophenol and nitrophenol) have been classified by United State Environmental Protection Agency (USEPA) and World Health Organization (WHO) as priority pollutants. The present work evaluated the distribution patterns of 19 polychlorinated biphenyls congeners, 17 organochlorine pesticides and selected phenolic derivatives (USEPA 11-priority pollutants) in the Buffalo River, in the Eastern Cape Province, South Africa between December 2015 and May 2016. The Liquid-liquid extraction technique was used for PCBs, OCPs and phenolic derivatives in the river water samples. Silica gel and florisil clean up were carried out for PCBs and OCPs samples respectively and analyzed with gas chromatography electron capture detector (GC/ECD). Phenolic compounds were derivatized and analyzed by gas chromatography mass spectrometer (GC/MS). Limits of detection (LOD), limit of quantitation (LOQ) and relative standard deviation (RSD) for the PCBs were 10 to 330 ng/L, 20 to 1,060 ng/L and 1.18 to 14.1 percent respectively. The LOD, LOQ and RSD for the OCPs were from 20 - 60 ng/L, 110 - 530 ng/L and 0.02 - 0.06 percent, while the corresponding values for the phenolic derivatives were 10 to 70 ng/L, 33 to 222 ng/L and 1.99 - 10.86 percent. In summer, the concentrations of PCBs, OCPs and phenolic derivatives ranged from
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  • Date Issued: 2017

The development of a translucent low fired porcelain casting slip using South African raw materials

  • Authors: Ruiters, Mellaney Bualin
  • Date: 2017
  • Subjects: Arts -- Research -- South Africa , Pottery -- Research -- South Africa , Ceramics -- Research -- South Africa
  • Language: English
  • Type: Thesis , Masters , MTech
  • Identifier: http://hdl.handle.net/10948/20004 , vital:29026
  • Description: The purpose of the research was to develop a translucent low fired porcelain casting slip using South African raw materials, due to the ever increasing electricity tariffs in South Africa as well as the physical deterioration put on the elements and brickwork in electric kilns when fired to traditional porcelain temperatures. Traditional porcelain bodies that can be purchased from South African suppliers are required to be fired to between 12000C and 13000C. The commercially prepared porcelains when tested produced white vitrified bodies but were lacking in translucency. Local ceramic artists are therefore compelled to import their porcelains from overseas suppliers if they require a white translucent porcelain but this is still requires a firing temperature well above 12000C. It has been shown that by using South African ceramic raw materials and adjusting a Parian ceramic formula using a selected frit; a low fired translucent porcelain can be made that matures below 12000C. The addition of paper fibres to the non-plastic porcelain was necessary to reduce the high shrinkage rate and prevented the clay from cracking and tearing in the firing process. With the further adjustments to the formula by the addition of calcium triphosphate true white translucent porcelain was produced. Without this last adjustment the porcelain would be an off-white colour due to the impurities found in the South African ceramic raw materials which are mainly contaminated with iron oxide. It was found that the following formula produced a white translucent porcelain which vitrified at 11900C and satisfies the original concept in the title stated above.
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  • Date Issued: 2017

Heavy mineral characterization and provenance interpretation of the Ecca Group of geological formations in Eastern Cape Province, South Africa

  • Authors: Sinuka, Sikhulule
  • Date: 2016
  • Subjects: Minerals -- South Africa -- Eastern Cape -- Classification Geology -- South Africa -- Eastern Cape Formations (Geology) -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10353/2911 , vital:28125
  • Description: The aim of the research focuses on characterizing heavy mineral assemblages and interpretation of the provenance of the Ecca Group of in the Eastern Cape Province, South Africa. In South Africa, the Ecca Group outcrops extensively in the Main Karoo Basin. Mudstone, siltstone, sandstone, minor conglomerate and coal are the major constituent lithologies within the group. For descriptive purposes, the Ecca is categorized into three different geographical areas: the southern area, the western and northwestern area and the northeastern area. Six of the sixteen geological formations, namely the Prince Albert, Whitehill, Collingham, Ripon, Fort Brown, Waterford and Koonap Formations are present in the study area and are best exposed in road cuttings. For purposes of comparison, the underlying Witteberg Group, the Dwyka (which has Formation status here), and the overlying Koonap Formation of the Beaufort Group, are included in the study. This study is motivated by the relatively little information that is available on the heavy minerals of the Ecca Group, and that research of this nature had not been undertaken in the study area before. Another contributing motivation was to determine whether heavy mineral assemblages could be used to identify formations of the Ecca Group and for correlating between different localities in accordance with studies done elsewhere. Additionally, diagnostic heavy mineral assemblages could aid with stratigraphic selection of future boreholes in the Ecca Group. Heavy minerals are natural provenance tracers because of their stable nature and hydrodynamic behaviour. They are both non-opaque and opaque, with apatite, epidote, garnet, rutile, staurolite, tourmaline and zircon being good examples of non-opaque grains while ilmenite and magnetite are the most common opaques. Heavies are either derived from stable minor accessory minerals or from abundant but unstable mafic components of the host rock. They are very useful in interpreting the provenance due to the fact that some minerals are diagnostic of certain source rocks. However, sediments are exposed to several factors (conditions) such as weathering, erosion, breakage due to abrasion, mixing and recycling during transportation from the source to the depositional area. This implies that there are parameters other than the parent lithology that determine their final composition.
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  • Date Issued: 2016

The effect of kelp supplementation in formulated feed on the production performance and gut microbiota of South African abalone (Haliotis midae)

  • Authors: Nel, Aldi
  • Date: 2016
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/899 , vital:20001
  • Description: Formulated feeds with a relatively low (< 5 % of dry mass) kelp (Ecklonia maxima) inclusion level are widely used on commercial abalone (Haliotis midae) farms in South Africa. Although the use of kelp, a major constituent of the natural diet of H. midae, as a dietary supplement is considered to enhance abalone growth and feed utilisation, there are no published studies which quantify the effects of kelp inclusion in formulated feeds. Furthermore, the physiological mechanisms by which kelp supplementation may positively influence abalone digestive physiology and growth are largely unknown. As the kelp supplement is comprised mostly of soluble fibres and abalone gut bacteria associated with macroalgae (and its fibrous polysaccharides) are known to play a key role in digestion, it was hypothesised that the kelp supplement influences the gut-bacterial community profiles of cultured abalone through prebiotic and other metabolic effects. The present thesis thus examined the effect of kelp supplementation on the performance of abalone (Haliotis midae) fed formulated feeds and explored the influence of a kelp supplement on the abalone gut microbiota and its function in the gastrointestinal tract. The key hypotheses of the study were that kelp supplementation in formulated feed: 1) enhances abalone growth; 2) causes a shift in abalone gut-bacterial community composition through a prebiotic-like effect; 3) may induce changes in crop morphology as a result of potential bacterial-associated increases in volatile short-chain fatty acids, and 4) alters digestive enzyme activities in the abalone gut through changes in bacterial-derived (exogenous) digestive enzymes. The growth-promoting efficacy of low-level kelp supplementation was tested by feeding isonitrogenous and isoenergetic experimental feeds containing 0.00 – 3.54 % kelp (dry mass) to sub-adult abalone (~43 mm shell length) for eight months under commercial farm conditions. The growth trial established that kelp supplementation (0.44 – 3.54 % of dry mass) promoted faster growth and improved feed conversion and protein efficiency ratios in cultured abalone compared to abalone fed the non-supplemented control diet, while there were no significant differences in growth for abalone fed the different kelp-supplemented diets (0.44, 0.88, 1.76 and 3.54 % of dry mass). Feed conversion and protein efficiency ratios displayed significant correlations with kelp level in the range of 0.00 – 3.54 % dry mass, and it is therefore recommended that kelp be included in the formulated feeds of cultured South African abalone at a rate of up to 3.54 % of dry mass. A kelp-supplemented (0.88 % dry weight inclusion) feed was fed to abalone under farm conditions to compare gut physiological parameters (crop morphology, digestive enzyme activities and the gut microbiota) in abalone against that of abalone fed an isonitrogenous and isoenergetic non-supplemented control feed. To establish if the observed higher abalone growth rates were related to improved gastrointestinal tract epithelium activity and integrity, as reflected by epithelial cell growth in response to potential changes in bacterial-derived short-chain fatty acid production, crop epithelial morphology was compared between abalone fed the kelp-supplemented and control feeds. Kelp supplementation did not induce any observable changes in crop epithelial cell height for farm-reared sub-adult abalone fed the experimental diets on-farm for seven weeks. This was attributed to the similar macronutrient compositions of kelp-supplemented and control diets and/ or the common diet history of experimental abalone from weaning to the initiation of the experiment. Digestive enzyme activity was compared between abalone fed a kelp-supplemented and a control feed during an on-farm feeding trial with sub-adult abalone. Gut samples were collected after seven weeks and colorimetric enzyme assays were performed for the polysaccharide-degrading enzymes amylase, alginate lyase, laminarinase and fucoidanase, and for acid protease, trypsin and chymotrypsin activity. Amylase and alginate lyase activities were relatively high, compared to the other enzymes. Polysaccharidase and acid protease activity levels did not differ significantly between abalone fed kelp-supplemented and control feeds, but a greater variability in enzyme activity levels was observed in abalone fed the control diet. It was hypothesised that this might be due to the kelp supplement promoting a more stable and less opportunistic gut-bacterial community than the control diet. Pooled gut samples of abalone fed the kelp-supplemented diet were used for proteomic analyses to identify the composition of enzyme proteins of both endogenous and exogenous origin in the abalone digestive system. The key polysaccharidases and proteases in the gut samples of kelp-supplemented formulated feed-fed abalone were all of abalone origin, whereas the bacterial enzymes were of the types that form part of intermediate reactions in metabolic pathways. The results suggested that bacterial enzymes play a different role to abalone endogenous enzymes in the digestion of formulated feed. While abalone enzymes appear to be the main degraders of carbohydrate and protein macromolecules, the profile of exogenous enzymes suggests that they perform bioconversions of smaller organic compounds. The profiles of gut-bacterial communities of farm-reared sub-adult abalone fed kelpsupplemented and control feeds on-farm for seven weeks were analysed with metagenomic pyrosequencing and DGGE analyses, using 16S rDNA-targeted amplified DNA. The results indicated a shift in gut-bacterial composition with a higher abundance of Mollicutes in abalone fed kelp-supplemented feed compared to those fed the control feed. DGGE band patterns displayed a greater within-group similarity in gut bacteria for abalone fed the kelpsupplemented diet and the presence of unique and variable bands for bacteria in the guts of abalone fed the control diet. It was concluded that when cultured abalone are fed kelpsupplemented formulated feeds, more stable gut bacterial communities are present compared to a more opportunistic gut-bacterial community in abalone fed non-supplemented feeds, and that the observed increase in Mollicutes could reflect the restoration of the abalone gut microbiota to a more natural state. The novel application of proteomics to abalone nutrition in the present study demonstrated that gut-bacterial enzymes may form part of many different metabolic pathways and suggests that the metabolism of the gut microbiota serves as an extension of the abalone’s digestive metabolism. Future studies should quantify the contribution of commensal gut-bacteria to cultured abalone nutrition by employing metabolomic studies to characterize the utilisation of bacterial-derived metabolites by the abalone host.
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  • Date Issued: 2016

The effects of land use on the avifauna and its conservation in a Kenyan coastal forest ecosystem, and the significance of the Arabuko Sokoke Forest to the local community

  • Authors: Chiawo, David O
  • Date: 2016
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5950 , http://hdl.handle.net/10962/d1020946
  • Description: This study examines the effects of land use on the bird community of Arabuko Sokoke Forest, the largest area of coastal forest remaining in East Africa and a major Important Bird Area in mainland Kenya. Bird species diversity in three land use types (primary forest, plantation and farm lands) was compared using multivariate analysis to determine the response of different feeding guilds to habitat characteristics. The effect of habitat characteristics on overall bird diversity and specific feeding guilds was tested using linear mixed models. A total of 2600 bird observations were recorded during point counts, representing 97 bird species including 25 fruit-eating birds, 17 nectar feeders; and 60 species belonging exclusively to other feeding guilds. Land use had a significant effect on overall bird diversity and abundance. The distribution of frugivorous birds was primarily influenced by the presence of fruiting trees rather than land use type, while nectarivores were significantly affected by vertical habitat heterogeneity and vegetation type. Although the distribution of insectivorous birds is influenced by many habitat factors, proximity to natural forest, habitat heterogeneity, and the presence of large trees and fruiting trees appear to be most important to this guild. The natural forest has the greatest avian diversity and a distinctive community compared to plantation and farmlands. Patterns of habitat use by birds in the area suggest that vertical vegetation heterogeneity and complexity is especially significant in sustaining diverse and abundant bird populations, if they are in close proximity to native forests. Improvement of conservation management for the plantation and farmlands is thus critical for connectivity with other remnant primary forest patches in the area. Socio-economic data was collected from 109 forest adjacent households to determine the value of the forest to the local community and their perception of conservation issues. Arabuko Sokoke Forest is important in supplementing the livelihood needs of the local community. However, the community lacks information on the forest management plan and many people have little knowledge of local birds, which could limit their capacity to participate in conservation projects. Drivers for local community participation in conservation projects are primarily a sustainable income and the fulfillment of basic household needs. Community conservation education is needed to promote local knowledge of forest biodiversity, as well as clear frameworks for the active involvement of the local community in forest management. Support of community based projects is vital to achieve both the conservation and livelihood objectives of the Arabuko Sokoke Forest management plan.
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  • Date Issued: 2016

Direct and indirect effects of zooplanktivorous predators on the estuarine plankton community

  • Authors: Wasserman, Ryan John
  • Date: 2014
  • Subjects: Zooplankton -- Effect of predation on , Predation (Biology) , Zooplankton -- Predators of , Copepoda
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5870 , http://hdl.handle.net/10962/d1012938
  • Description: Although predation has been identified as a potentially important driver in terrestrial and freshwater ecosystems, estuarine planktonic research has focused largely on the so-called "bottom-up" drivers of community assemblages. As such, this thesis focuses on the direct and indirect effects of zooplanktivorous predators on the planktonic community in an estuarine environment. By using a suite of in situ mesocosm experiments, a number of hypotheses, pertaining to the major research themes associated with predator-prey interactions, are tested. These themes included trophic cascading, risk effects associated with predation events and the importance of predator diversity in maintaining prey communities. The first experiment assessed the significance of apex predation pressure for the planktonic community through trophic cascades. Various treatments using in situ mesocosms were established in a closed oligotrophic estuary to highlight the importance of predation in stabilising estuarine plankton abundances. Through either the removal (filtration) or addition of certain planktonic groups, varied trophic scenarios were established. The experimental treatment containing apex zooplanktivores had consequences for multiple trophic levels, exerting a stabilising pressure throughout the food web (Chapter 3). Furthermore, pyrosequencing of filtered water samples revealed that when compared to the remaining treatments, the treatment containing stable apex predatory pressure experienced limited temporal deviation-from-initial in bacterial community structure (Chapter 4). These findings are consistent with trophic cascade theory whereby predators mediate interactions at multiple lower trophic levels with consequent repercussions for diversity. To assess the non-consumptive effects of predators on prey, two experiments were conducted. Firstly, using egg numbers per clutch as a measure of potential reproductive output, the non-lethal effects of predatory pressure on reproductive success in a key planktonic copepod was investigated. In this study, the average clutch size of fecund female copepods was found to be consistently lower in the presence of predators when compared to females not exposed to predation threat (Chapter 5). The second study assessed the effects of conspecific chemical alarm cues associated with predation, on population dynamics of a copepod species. This study revealed that the copepods appear to detect the presence of chemical alarm cues associated with predation events, with repercussions for population demographics over time. Furthermore, it showed that in the absence of actual predation, copepod prey responses to alarm cues were adjusted over time, consistent with the threat sensitive predator avoidance hypothesis (Chapter 6). The final data chapter dealt with predator diversity and its implications for zooplankton community structure. By experimentally monitoring the effects of two alternate model predators on the metazoan community over time, dissimilarities in community level control emerged. Alternate key prey populations were regulated by the different model predators, highlighting the importance of predator and prey behaviour in mediating predator-prey interactions (Chapter 7). These results highlight the potential importance of predators in maintaining community dynamics in estuarine planktonic communities under certain conditions. This study represents some of the first work to address these various aspects of predator-prey dynamics within the context of planktonic estuarine ecology.
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  • Date Issued: 2014

Teachers' perceptions of behavioural problems manifested by Grade 11 and 12 learners in three Namibian schools

  • Authors: Akawa, Ester Anna Nelago
  • Date: 2014
  • Subjects: Education, Secondary -- Namibia School children -- Namibia -- Attitudes Learning disabilities -- Social aspects Behavior disorders in children -- Education (Secondary) -- Namibia Children with social disabilities -- Education (Secondary) -- Namibia Emotional problems of children -- Education (Secondary) -- Namibia Teachers -- Job stress -- Namibia
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1962 , http://hdl.handle.net/10962/d1010868
  • Description: In Namibia today few learners with behavioural and learning problems are within special schools as most are placed within the mainstream school system. Placing these learners within the mainstream system is part of the policy of Inclusive Education (IE) because it argues that this would benefit these learners and also save resources. IE is concerned with addressing barriers to learning and behavioural problems are regarded as one of these barriers. IE argues for a series of new approaches to the diagnosis and response to learners with behavioural problems. This poses challenges for teachers in mainstream schools. Teachers are at the forefront of this situation as they are usually the first to observe and experience the behavioural problems in the schools and are expected to respond appropriately. They find this situation both challenging and problematic. This research explores a sample of teachers’ perceptions of learners’ behavioural problems. To collect in-depth information, this study followed a qualitative approach with a case study design. The data were collected through semi-structured interviews, supplemented with observation and document analysis. The study consisted of fifteen respondents: three principals, three teacher counsellors and nine teachers from the three selected schools. This study illuminates the types of behaviour that teachers encounter, the impact of these behaviours, the factors seen as contributing to these behaviours, and how teachers and the school system deal with these behaviours. In addition the study applies Bronfenbrenner’s bioecological model (1992) to explain how the behaviours manifested by Grade 11 and 12 learners, and identified as problematic by teachers, are part of an interconnected nested social system. The results from the study indicate the manifestation of behavioural problems to be common occurrences in secondary schools are evident, amongst others, through fighting, bullying, substance abuse, truancy, and disrespect of teachers and authority. The teachers pointed to the prevalence of these problems as well as the serious impact such problems have on these learners, their fellow learners, and on the teachers. The teachers identified a complex array of what they saw as contributing factors located within the school, peer groups, family and home circumstances, the local community, as well within the national education policy, the economy and society. The study points to some specific, as well as broader, lessons and opportunities for action both for those managing the education system at the national level and for schools and teachers.
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  • Date Issued: 2014

A psychobiographical study of William Wilberforce

  • Authors: Daubermann, Bettina Pamela
  • Date: 2013
  • Subjects: Personality development
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:9966 , http://hdl.handle.net/10948/d1020857 , http://hdl.handle.net/10948/d1021085
  • Description: The proposed study is of a psychobiographical nature and employs a qualitative research approach. The individual that forms the subject of this study is William Wilberforce. A social activist most of his life, Wilberforce is best known for his voice and works behind the abolition of the slave trade in 1807 and the abolition of slavery in 1833. His ambitious nature, social eloquence and verbal intellect resulted in him being elected as a member of parliament in the House of Commons in England during the period 1780 to 1825. Transformed by the Christian faith in 1885, Wilberforce came to the realization he had received a calling from God to speak up for those who could not with a specific task set out before him which was to abolish slavery. It was the purpose of the present research to explore and describe Wilberforce’s psychological development across his life-span according to Carl Rogers’ (1961) personality theory of optimal development. Salient aspects of Wilberforce’s life were related and compared to components of the theory so as to explore and describe the degree of optimal development that Wilberforce reached at different points in his life and whether he could be described as a fully functioning person. According to Rogers’ theory William Wilberforce was chosen as the research subject for his historical contribution to mankind by his devotion to the moral enhancement of his country.
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  • Date Issued: 2013

Managing Information Confidentiality Using the Chinese Wall Model to Reduce Fraud in Government Tenders

  • Authors: Rama, Sobhana
  • Date: 2013
  • Subjects: Chinese walls (Communication barriers) -- South Africa , Business logistics -- South Africa , Confidential communications -- South Africa , Conflict of interests -- South Africa , Fraud -- South Africa , Information services -- Government policy -- South Africa , Communication policy -- South Africa , Communication planning -- South Africa , Chinese Wall Model , Information confidentiality , Conflict of Interest , Government tender fraud
  • Language: English
  • Type: Thesis , Masters , MCom (Information Systems)
  • Identifier: vital:11136 , http://hdl.handle.net/10353/d1006956 , Chinese walls (Communication barriers) -- South Africa , Business logistics -- South Africa , Confidential communications -- South Africa , Conflict of interests -- South Africa , Fraud -- South Africa , Information services -- Government policy -- South Africa , Communication policy -- South Africa , Communication planning -- South Africa , Chinese Wall Model , Information confidentiality , Conflict of Interest , Government tender fraud
  • Description: Instances of fraudulent acts are often headline news in the popular press in South Africa. Increasingly, these press reports point to the government tender process as being the main enabler used by the perpetrators committing the fraud. The cause of the tender fraud problem is confidentiality breach of information. This is accomplished, in part, by compromising the tender information contained in the government information system. This results in the biased award of a tender. Typically, the information in the tender process should be used to make decisions about a tender’s specifications, solicitation, evaluation and adjudication. The sharing of said information to unauthorised persons can be used to manipulate and corrupt the process. This in turn corrupts the tender process by awarding a tender to an unworthy recipient. This research studies the generic steps in the tender process to understand how information is used to corrupt the tender process. It proposes that conflict of interest, together with a lack of information confidentiality in the information system, paves the way for possible tender fraud. Thereafter, a system of internal controls is examined within the South African government as well as in foreign countries to investigate measures taken to reduce the breach of confidential information in the tender process. By referring to the Common Criteria Security Model, various critical security areas within the tender process are identified. This measure is assisted with the ISO/IEC 27002 (2005) standard which has guiding principles for the management of confidential information. Thereafter, an information security policy,the Chinese Wall Model will be discussed as a means of reducing instances where conflict of interest may occur. Finally, an adapted Chinese Wall Model, which includes elements of the tender process, is presented as a way of reducing fraud in the government tender process. Finally, the research objective of this study is presented in the form of Critical Success Factors that aid in reducing the breach of confidential information in the tender process. As a consequence, tender fraud is reduced. These success factors have a direct and serious impact on the effectiveness of the Chinese Wall Model to secure the confidentiality of tender information. The proposed Critical Success Factors include: the Sanitisation Policy Document, an Electronic Document Management System, the Tender Evaluation Ethics Document, the Audit Trail Log and the Chinese Wall Model Prosecution Register.
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  • Date Issued: 2013

An analysis of ionospheric response to geomagnetic disturbances over South Africa and Antarctica

  • Authors: Ngwira, Chigomezyo Mudala
  • Date: 2012
  • Subjects: Geomagnetism -- South Africa , Geomagnetism -- Antarctica , Ionospheric storms -- South Africa , Ionospheric storms -- Antarctica
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5534 , http://hdl.handle.net/10962/d1012957
  • Description: The ionosphere is of practical importance for satellite-based communication and navigation systems due to its variable refractive nature which affects the propagation of trans-ionospheric radio signals. This thesis reports on the first attempt to investigate the mechanisms responsible for the generation of positive ionospheric storm effects over mid-latitude South Africa. The storm response on 15 May 2005 was associated with equatorward neutral winds and the passage of travelling ionospheric disturbances (TIDs). The two TIDs reported in this thesis propagated with average velocities of ∼438 m/s and ∼515 m/s respectively. The velocity of the first TID (i.e. 438 m/s) is consistent with the velocities calculated in other studies for the same storm event. In a second case study, the positive storm enhancement on both 25 and 27 July 2004 lasted for more than 7 hours, and were classified as long-duration positive ionospheric storm effects. It has been suggested that the long-duration positive storm effects could have been caused by large-scale thermospheric wind circulation and enhanced equatorward neutral winds. These processes were in turn most likely to have been driven by enhanced and sustained energy input in the high-latitude ionosphere due to Joule heating and particle energy injection. This is evident by the prolonged high-level geomagnetic activity on both 25 and 27 July. This thesis also reports on the phase scintillation investigation at the South African Antarctic polar research station during solar minimum conditions. The multi-instrument approach that was used shows that the scintillation events were associated with auroral electron precipitation and that substorms play an essential role in the production of scintillation in the high latitudes. Furthermore, the investigation reveals that external energy injection into the ionosphere is necessary for the development of high-latitude irregularities which produce scintillation. Finally, this thesis highlights inadequate data resources as one of the major shortcomings to be addressed in order to fully understand and distinguish between the various ionospheric storm drivers over the Southern Africa mid-latitude region. The results presented in this thesis on the ionospheric response during geomagnetic storms provide essential information to direct further investigation aimed at developing this emerging field of study in South Africa.
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  • Date Issued: 2012

Ruthenium and palladium assisted silver transport in silicon carbide

Systemic influence on Black South African adolescents' career development : adolescent and parental perspectives

  • Authors: Collett, Gary Reece
  • Date: 2010
  • Subjects: Career development -- South Africa , Teenagers -- Vocational guidance , Adolescence , Parent and child
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:9863 , http://hdl.handle.net/10948/1513 , Career development -- South Africa , Teenagers -- Vocational guidance , Adolescence , Parent and child
  • Description: Currently, no career theories exist that sufficiently explain the career development of South Africa’s diverse population groups. Consequently, South African researchers have been entirely dependent on international, western-informed career theories. While such theories have taken on a more ethnocentric complexion in recent times, they remain essentially decontextualised for South Africa. Furthermore, although the influence of family and the significant roles of parents have been theoretically acknowledged as critical influences in adolescent career development, there is still a considerable lack of research in South Africa on this topic. The present study therefore explored the perceptions of systemic influences on adolescent career development from the perspectives of both Black middle-class South African Grade 11 learners and their parents. The research was conceptualised within the Systems Theory Framework (STF) of career development and used its derivative instrument, the My Systems of Career Influences (MSCI, Adolescent). The present study utilised a qualitative research method, using answers derived from the MSCI (Adolescent) booklets to inform semi-structured interviews. The data analysis procedure involved the use of Interpretive Phenomenological Analysis to qualitatively analyse data obtained from the semistructured interviews. Findings revealed a number of influences within the individual system (personality, values, abilities), social system (adolescents’ parents and teachers) and societal-environmental system (financial support, the opportunity to work overseas, geographical location, job availability, and the location of universities) that were acknowledged as having an influence on the career development of South African Black middle class adolescents. Each of these findings were explored and unpacked under the four xii identified Interpretive Phenomenological Analysis (IPA) superordinate themes of Family Dynamics, Great Expectations, The Ghost of Apartheid and Coconuts Fall Far From the Tree. Lastly, the limitations of the present study, as well as recommendations for future research are discussed.
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  • Date Issued: 2010

A changing didacticism : the development of South African young adult fiction from 1985 to 2006

  • Authors: Williams, Jenna Elizabeth
  • Date: 2009 , 2013-07-16
  • Subjects: Didactic fiction, English -- History and criticism Young adult fiction, South African -- History and criticism South Africa -- In literature South Africa -- Politics and government
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:2255 , http://hdl.handle.net/10962/d1004293
  • Description: This thesis endeavours to establish how political transformation in South Africa has impacted on the didactic function of locally produced young adult fiction between the years of 1985 and 2006. To this end, a selection of young adult novels and short stories are examined in relation to the time period during which they were written or are set, namely the final years of apartheid (from 1985 to the early 1990s), the period of transition from apartheid to democracy (approximately 1991 to 1997), and the early years of the twenty-first century (2000 to 2006). Chapter One provides a brief overview of publishing for the juvenile market in South Africa over the last century, noting how significant historical and political events affected both the publishing industry itself and the content of children's and young adult literature. This chapter also adumbrates the theoretical foundations of the study. The second chapter examines a selection of texts either written or set during the final years of the apartheid regime. This chapter establishes how authors during this period challenged notions of racial inequality and undermined the policies of the apartheid government, with varying degrees of success. The authors' methods in encouraging their (predominantly white) readers to question apartheid ideology are also interrogated. Those novels written after, but set during, the apartheid era are examined with the aim of determining their authors' didactic objectives in revisiting this period in their novels. Chapter Three explores how authors writing during the transition period aimed to encourage readers to participate in the building of a 'rainbow nation,' by portraying idealised modes of relating to the racial 'other.' While some of the authors examined in this chapter are optimistic, and even naïve, in their celebration of a newly established democracy, others are more cautious in suggesting that decades of oppression and separation can so easily be overcome. Chapter Four demonstrates how the freedoms afforded by a democratic society have prompted young adult authors to explore the possibilities of adapting the sub-genre of the teenage problem novel to suit a distinctly South African context. While some of these texts are not overtly didactic in nature, they confront the unique issues faced by a generation of South African teenagers raised in a democratic society, and in some cases challenge readers to reconsider their approach to such issues.
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  • Date Issued: 2009

Imagined pasts, suspended presents : South African literature in the contemporary moment

  • Authors: Mbao, Wamuwi
  • Date: 2009
  • Subjects: Post-apartheid era -- South Africa South African literature (English) -- History and criticism Authors, South African -- 21st century -- Criticism and interpretation South African literature -- 21st century -- History and criticism South African fiction (English) -- History and criticism Xenophobia -- South Africa Apartheid in literature
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:2202 , http://hdl.handle.net/10962/d1002244
  • Description: Scholarship on Post-Apartheid South African literature has engaged in various ways with the politics of identity, but its dominant mode has been to understand the literature through an anxious rupture-continuation paradigm in which the Apartheid past manifests itself in the present. However, in the contemporary moment, there are writers whose texts attempt to forge new paths in their depictions of identities both individual and collective. These texts are useful in contemplating how South Africans experience belonging and dislocation in various contexts. In this thesis, I consider a range of contemporary South African texts via the figure of lifewriting. My analysis demonstrates that, while many texts in the contemporary moment have displayed new and more complex registers of perception concerning the issue of ‘race’, there is a need for more expansive and fluid conceptions of crafting identity, as regards the politics of space and how this intersects with issues of belonging and identity. That is, much South African literature still continues along familiar trajectories of meaning, ones which are not well-equipped to understand issues that bedevil the country at this particular historical moment, which are grounded in the political compromises that came to pass during the ‘time of transition’. These issues include the recent spate of xenophobia attacks, which have yet to be comprehensively and critically analysed in the critical domain, despite the work of theorists such as David Coplan. Such events indicate the need for more layered and intricate understandings of how our national identity is structured: Who may belong? Who is excluded? In what situations? This thesis engages with these questions in order to determine how systems of power are constructed, reified, mediated, reproduced and/or resisted in the country’s literature. To do this, I perform an attentive reading of the mosaic image of South African culture that emerges through a selection of contemporary works of literature. The texts I have selected are notable for the ways in which they engage with the epistemic protocol of coming to know the Other and the self through the lens of the Apartheid past. That engagement may take the form of a reassertion, reclamation, displacement, or complication of selfhood. Given that South African identities are overinscribed in paradigms in which the Apartheid past is primary, what potentials and limits are presently encountered when writing of the self/selves is attempted? My study goes beyond simply asserting that not all groups have equal access to representation. Rather, I demonstrate that the linear shaping of the South African culture of letters imposes certain restrictions on who may work within it. Here, the politics of publishing and the increasing focus on urban spaces, such that other spaces become marginalized in ways that reflect the proclivities of the reading public, are subjected to close scrutiny. Overall, my thesis aims to promote a rethinking of South African culture, and how that culture is represented in, and defined through, our literature.
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  • Date Issued: 2009
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