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Assessment of the status of lean implementation at selected South African Revenue Service branch offices

  • Authors: Samela, Thandile
  • Date: 2011
  • Subjects: Lean manufacturing -- Evaluation , Production management
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: http://hdl.handle.net/10948/8702 , vital:26422
  • Description: Governments around the world want to deliver better education, better health care, better pensions and better transportation services. They know that impatient electorates want to see change, and fast. But, the funds required to meet such expectations are enormous, particularly in the many developed economies where populations are aging and the public sector's productivity has not kept pace with that of the private sector. The need to get value for money from governments at all levels is therefore under the spotlight as never before. However, cost-cutting programmes that seek savings of 1 to 3% per year will not be sufficient and, in some cases, may even weaken the quality of service (Bhatia & Drew, 2006). One of the key innovative means to improve productivity, and do more with less, is through the implementation of lean initiatives. The purpose of this study is to conduct an 'Assessment of the status of lean implementation at selected SARS (South African Revenue Service) branch offices'. Literature review was conducted to investigate the origins of lean and how the service industry tapped from this philosophy, which was initially developed for the manufacturing sector. The lean philosophy has now been widely adopted in various service industries, from government agencies such as the South African Revenue Service to financial institutions such as ABSA bank, including the healthcare industry. The findings of the research indicated that even though the organisation has made a strategic decision to implement lean, this has not been entirely successful as there is a lack of understanding of lean among managers and team leaders. There are some pockets of excellence though. The researcher recommends that a comprehensive road map be developed to guide the organisation into a sustainable lean implementation.
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  • Date Issued: 2011

Associations in ephemeral systems: the lack of trophic relationships between sandhoppers and beach wrack

  • Authors: Porri, Francesca , Hill, Jaclyn M , McQuaid, Christopher D
  • Date: 2011
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/444552 , vital:74250 , https://doi.org/10.3354/meps08951
  • Description: In ephemeral systems, material subsidies can play a key role in the persistence and connectivity of populations, especially if the organisms living within them are trophically dependent on imported resources. Sandy beaches are heavily subsidized by organic material of both terrestrial and marine origin. For highly mobile supratidal fringe species, such as amphipods, which are marine but with a high tolerance of aerial conditions, such material potentially provides both food and shelter. We investigated the relationship between beach wrack and amphipods by examining the trophic contribution of allochthonous food sources to sandhopper diets using stable isotope analysis. Replicate samples of the sandhopper Talorchestia capensis and several types of beach wrack (including seagrass, wood and different macrophytes) colonized by these amphipods were collected from 11 sites within one biogeographical region along the south coast of South Africa.
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  • Date Issued: 2011

Balancing the educator's rights to fair labour practices and to strike with the right to education

  • Authors: Govender, Mahalingum
  • Date: 2011
  • Subjects: Right to education -- Law and legislation -- South Africa , Children's rights -- South Africa , Educational law and legislation -- South Africa , Strikes and lockouts -- Teachers -- South Africa , Right to strike -- South Africa
  • Language: English
  • Type: Thesis , Masters , LLM
  • Identifier: vital:10198 , http://hdl.handle.net/10948/1565 , Right to education -- Law and legislation -- South Africa , Children's rights -- South Africa , Educational law and legislation -- South Africa , Strikes and lockouts -- Teachers -- South Africa , Right to strike -- South Africa
  • Description: This treatise investigates the potential for law (including courts and tribunals) to intervene and act as a lever for the protection and advancement of the rights of the child including the right to basic education. The dissertation critically explores the debate on the educator‟s right to strike and fair labour practices and the child‟s right to education, by assessing the rights and liberties, which accrue to educators and the child (learners) in terms of existing law. The South African Constitution has made specific provision for the protection of the rights of children and the rights of educators and these rights are fundamental to the development of a society in transition. The vexed question that arises is whether these rights can co-exist in a society that has inherited a legacy of discrimination and inequality. The consequences of this legacy have resulted in the rights of educators competing with those of learners. The normalisation of the balance of these opposite rights is the challenge that lies ahead and this process will require intervention of all stakeholders rather than purely legislative intervention. This dissertation recommends a consensus-based approach, which is the most appropriate solution to balance the rights of educators with this of the child‟s right to education, as opposed to a declaration of the education sector as an essential service. It further proposes the establishment of a more structured and organised forum / institution and its sole purpose would be to deal with the individual or collective rights of educators that compete with the rights of learners.
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  • Date Issued: 2011

Barriers to entrepreneurship: assessing NMBM school leavers for business enterprise

  • Authors: Qumza, Thabang Vuyo
  • Date: 2011
  • Subjects: Young adults -- Employment -- South Africa -- Eastern Cape , Youth development -- South Africa , Entrepreneurship -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: vital:8943 , http://hdl.handle.net/10948/d1011804 , Young adults -- Employment -- South Africa -- Eastern Cape , Youth development -- South Africa , Entrepreneurship -- South Africa -- Eastern Cape
  • Description: In plight of the country‟s high unemployment, poverty, and income inequalities, there is an urgent need to address these issues by converging toward entrepreneurship. World-wide, it is acknowledged by both government and academia that entrepreneurship soothes and remedies socio-economic ills. It creates employment, wealth, alleviates poverty, increases tax base, balances income disparities and accomplishes social stability. With the high youth (18-34 year age) unemployment looming at 73 percent and a low South African total entrepreneurship rate at 8.9 percent; this study attempts to investigate the barriers that hinder school leavers from engaging in entrepreneurship. The research investigates critical entrepreneurial factors including entrepreneurial character and behaviour, entrepreneurial knowledge and skills, managerial knowledge and skills, knowledge on legal aspects of a business, sourcing of finances, and entrepreneurial background and orientation. The primary objective was met through the investigation of the secondary objectives. This was accomplished through a questionnaire survey, composed with multiple choice questions and closed questions measured on a Likert scale. The questionnaire was constructed based on the literature reviewed from various sources including books, dissertations, journals, government reports, newspapers, magazines, internet, television and radio broadcasts (interviews and news). The study discovers that learners are inhibited by various factors from engaging into business venturing. The list of barriers identified was: A discouraging entrepreneurial background (heritage) – parents had low levels of education and were not entrepreneurial, Weak entrepreneurial character and behaviour, Lack of entrepreneurial exposure and work experience, Learners lack financial skills and computer skills, Families lack savings to financially support their business start-ups, Limited knowledge on the legal aspects regulating a business, Limited knowledge on sourcing finances (angel and venture capital investors).
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  • Date Issued: 2011

Bayesian logistic regression models for credit scoring

  • Authors: Webster, Gregg
  • Date: 2011
  • Subjects: Bayesian statistical decision theory Credit scoring systems Regression analysis Logistic regression analysis Monte Carlo method Markov processes Financial institutions
  • Language: English
  • Type: Thesis , Masters , MCom
  • Identifier: vital:5574 , http://hdl.handle.net/10962/d1005538
  • Description: The Bayesian approach to logistic regression modelling for credit scoring is useful when there are data quantity issues. Data quantity issues might occur when a bank is opening in a new location or there is change in the scoring procedure. Making use of prior information (available from the coefficients estimated on other data sets, or expert knowledge about the coefficients) a Bayesian approach is proposed to improve the credit scoring models. To achieve this, a data set is split into two sets, “old” data and “new” data. Priors are obtained from a model fitted on the “old” data. This model is assumed to be a scoring model used by a financial institution in the current location. The financial institution is then assumed to expand into a new economic location where there is limited data. The priors from the model on the “old” data are then combined in a Bayesian model with the “new” data to obtain a model which represents all the available information. The predictive performance of this Bayesian model is compared to a model which does not make use of any prior information. It is found that the use of relevant prior information improves the predictive performance when the size of the “new” data is small. As the size of the “new” data increases, the importance of including prior information decreases
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  • Date Issued: 2011

Becoming African: debating post-apartheid white South African identities

  • Authors: Matthews, Sally
  • Date: 2011
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/142409 , vital:38077 , DOI: 10.1080/14725843.2011.530440
  • Description: The post-apartheid era necessitates the rethinking of white identities in South Africa. One way in which some white South Africans are seeking to redefine themselves is through describing themselves as African. However, claims by white South Africans that they too are Africans have been met with mixed responses from black South Africans. In this article I use contributions to an online university students' forum to explore ways in which some white South Africans are embracing an African identity and to consider ways in which some black South Africans are responding to white South Africans' shifting identities. I use contributions to this forum as a starting point to think about the possibilities and limitations that the embracing of an African identity has for the development of what Frankenberg calls ‘anti-racist forms of whiteness’ among white South Africans.
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  • Date Issued: 2011

Being Indian, being MK: an exploration of the experiences and ethnic identities of Indian South African Umkhonto we Sizwe members

  • Authors: Lalla, Varsha
  • Date: 2011
  • Subjects: Umkhonto we Sizwe (South Africa) -- Research Political activists -- Research -- South Africa East Indians -- Politics and government -- Research -- South Africa Ethnicity -- Political aspects -- South Africa -- Research
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:2792 , http://hdl.handle.net/10962/d1003002
  • Description: Umkhonto we Sizwe (MK) was a military organization dominated by black Africans. Although it is not generally associated with Indian South Africans, who form a minority in the country, there were Indian MK members. This thesis explores the way in which Indian MK members reconciled aspects of their ethnic identity with their membership of MK. It explores the experiences of two generations of members: those born between 1929 and 1944 and those born between 1960 and 1969. In particular it looks at whether they experienced tensions between their ethnic and political identities. It explores what set these Indian South Africans apart from the rest of the Indian South African community that did not join MK. It also looks at what significant differences there were between different generations of Indian MK members. The research results show that the first generation MK members believe that their MK activities were „the highest form of passive resistance‟. An explanation for this way of referring to their activities could be that this was a way of reconciling tensions between their ethnic and political identities. The first generation was also very critical of the Indian SA community. This could be because they still feel part of this community despite having a strong political consciousness that is different from most of the community. It was found that some of the features that set Indian MK members apart from other Indian South Africans were that they were not raised in very religious households and occupied a fairly low rather than „middle man‟ economic position. In addition, members of the first generation of MK members were raised in comparatively multi-racial areas. Both generations made the decision to join MK because of Indian role models. There were some marked differences between the two generations of MK veterans. Most notably, the younger did not see their activities as in line with passive resistance and they also displayed more ambivalence about their ethnic identities.
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  • Date Issued: 2011

Being moved by a way the world is not

  • Authors: Jones, Ward E
  • Date: 2011
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/275631 , vital:55064 , xlink:href="https://doi.org/10.1007/s11229-009-9522-z"
  • Description: At the end of Lecture 3 of The Empirical Stance, Bas van Fraassen suggests that we see the change of view involved in scientific revolutions as being, at least in part, emotional. In this paper, I explore one plausible way of cashing out this suggestion. Someone’s emotional approval of a description of the world, I argue, thereby shows that she takes herself to have reason to take that description seriously. This is true even if she is convinced—as a scientific community is when it considers alternative theories—that this description is false, that it is not the way the world is.
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  • Date Issued: 2011

Benefication of glycerol from algae and vegetable oil

  • Authors: Mafu, Lubabalo Rowan
  • Date: 2011
  • Subjects: Glycerin -- Biotechnology , Biodiesel fuels , Renewable natural resources
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:10409 , http://hdl.handle.net/10948/d1011503 , Glycerin -- Biotechnology , Biodiesel fuels , Renewable natural resources
  • Description: This research has been directed at furthering the utilization of crude glycerol oversupply formed as a by-product from the biodiesel manufacturing process. Phosphorylation of hydroxyl groups is a synthetic route that was investigated for the conversion of glycerol into a glycerol-phosphate (GPE) ester mixture. The process investigated for the synthesis of a GPE product was based on phosphorylation reaction procedures that were previously reported in the literature. The reaction to convert glycerol into a GPE mixture has been thoroughly investigated and the hydrogen chloride gas formed as a reaction by-product has been optimized. The chemical properties of GPE have been studied and discussed together with a mass balance of the overall glycerol phosphorylation process. The phosphate groups contained in polyhydric phosphate molecules have a potential chelating effect on cations. There are several cations that may be chelated by the phosphate ester group of polyhydric phosphate molecules. These cations include ammonium (NH4+), Potassium (K+), Calcium (Ca2+) etc, which are essential as nutrients in plant fertilizer formulations. This research has investigated the use of a GPE synthesized from glycerol in the laboratory and the use thereof as a phosphorus containing base in the formulation and evaluation of Nitrogen, Phosphorus and Potassium (NPK) containing fertilizer solution, Ammonium-Potassium-Glycerol-Phosphate (APGP) fertilizer solution. The APGP fertilizer solution has further been evaluated by growing two week old tomato seedlings under controlled conditions. The performance of the APGP fertiliser solution has been evaluated using design of experiments by comparison with traditionally used liquidAmmonium-Potassium-Phosphate inorganic fertilizer. This fertilizer solution has been prepared in similar manner as APGP formulation with the difference between them being the source of phosphorus. The results have been evaluated using statistic analysis where a significant difference between the evaluated fertilizer formulations was found. The comparative study of these formulations was monitored by the observed plant weights. A blank treatment was used as a control to determine if a significant difference among these formulations was observed. Anova single factor and t-Test methods (Two-Samples assumed of equal variances) are statistical models that were applied to interpret the observed experimental data with respect to wet and dry weighed masses of tomato seedlings. These methods indicated a confirmed conclusion that there was a significant difference between APPO4 solution and APGP solution. The observed data have shown that the APPO4 solution provided significantly better fertigation performance than APGP solution. Consequently, further investigation has been conducted to determine the cause of the poorer performance of the APGP solution. The further study of the APGP fertilizer solution included nutrient stability testing, biological analysis and other observed physical changes of the APGP solution over time. Biological results have revealed the presence of a Fusarium fungus species that has grown and is suspended in APGP fertilizer solution. This microbe species has been observed to play a vital role in consuming fertilizer nutrients. In addition, the observed abnormal plant growth and nutrient decomposition of the APGP formulation has been proposed to be mostly a result of the pathogenicity of the fusarium fungi species that was suspended in the APGP solution. Further work has been proposed in which the effect of such biological contamination is eliminated through adequate sterilization procedures and the APGP formulation re-evaluated.
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  • Date Issued: 2011

Bioactivity and phytochemical analysis of Hydnora Africana on some selected bacterial pathogens

  • Authors: Nethathe, Bono Bianca
  • Date: 2011
  • Subjects: Helicobacter pylori , Medicinal plants -- South Africa -- Eastern Cape , Microbial sensitivity tests , Herbs -- Therapeutic use -- South Africa -- Eastern Cape , Plants -- Analysis , Staphylococcus aureus , Aeromonas hydrophila , Drug resistance in microorganisms , Plant-pathogen relationships
  • Language: English
  • Type: Thesis , Masters , MSc (Microbiology)
  • Identifier: vital:11247 , http://hdl.handle.net/10353/d1001063 , Helicobacter pylori , Medicinal plants -- South Africa -- Eastern Cape , Microbial sensitivity tests , Herbs -- Therapeutic use -- South Africa -- Eastern Cape , Plants -- Analysis , Staphylococcus aureus , Aeromonas hydrophila , Drug resistance in microorganisms , Plant-pathogen relationships
  • Description: Abstract Medicinal plants have been for long remedies for human diseases because they contain components of therapeutic value. The growing problem of antibiotic resistance by organisms demands the search for novel compounds from plant based sources. The present study was aimed at evaluating the bioactivity and phytochemical analysis of Hydnora africana on clinical and standard strains of Helicobacter pylori (PE 252C and ATCC 43526), Aeromonas hydrophila ATCC 35654, and Staphylococcus aureus NCT 6571 in an effort to identify potential sources of cheap starting materials for the synthesis of new drugs against these strains. Ethyl acetate, acetone, ethanol, methanol, and water crude extracts of H. africana were screened for activity against the test organisms using the agar well diffusion assay. The Minimum Inhibitory Concentration (MIC50) and Minimum Bactericidal Concentration (MBC) of the most potent extracts were determined by the microdilution method, followed by qualitative phytochemical analysis. Results were analyzed statistically by ANOVA one - way test. Different concentrations (200,100, 50mg/mL) of the methanol, acetone, ethanol and ethyl acetate extracts showed activity against S. aureus and A. hydrophila while for H. pylori, only methanol and ethyl acetate extracts were active; water showed no activity for all studied bacterial pathogens. Mean zone diameter of inhibition which ranged from 0-22mm were observed for all test bacterial pathogens and 14-17mm for ciprofloxacin. The activity of methanol and ethyl acetate extracts were statistically significant (P< 0.05) compared to all the other extracts. MIC50 and MBC ranged from 0.078 – 2.5mg/mL, 0.78-25mg/mL respectively for all tested bacterial pathogens. For ciprofloxacin, the MIC50 and MBC ranged from 0.00976 – 0.078mg/mL and 0.098– 0.78mg/mL respectively. There was no statistically significant difference between extracts (methanol, acetone, ethanol, ethyl acetate) and the control antibiotic (ciprofloxacin) (P> 0.05). Qualitative phytochemical analysis confirmed the presence of alkaloids, saponins, steroids, tannins and flavonoids in the methanol, acetone,ethanol and ethyl acetate extracts. The results demonstrate that H. africana may contain compounds with therapeutic potentials which can be lead molecules for semi-synthesis of new drugs.
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  • Date Issued: 2011

Biological control of cactaceae in South Africa

  • Authors: Paterson, Iain D , Hoffmann, John H , Klein, Hildegard , Mathenge, C W , Neser, Stephan , Zimmermann, Helmuth G
  • Date: 2011
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/452308 , vital:75119 , https://hdl.handle.net/10520/EJC32918
  • Description: This review is a summary of developments that have contributed to the success of several biological control programmes against invasive cactus species (Cactaceae) that have been worked on in South Africa over the last 12 years. Six potential biological control agents have been identified for the control of Pereskia aculeata Mill. and molecular studies have identified the origin of the South African P. aculeata population. Host-specificity testing is now required for the three most promising of these agents. The successful biological control programme against Opuntia stricta (Haw.) Haw. has resulted in a change in management strategies against this weed in the Kruger National Park and the control of O. stricta is now almost entirely reliant on biological control. Taxonomic problems associated with the identification of Cylindropuntia fulgida var. fulgida (Engelm.) F.M.Knuth var. fulgida have been resolved and an appropriate cochineal insect (Hemiptera: Dactylopiidae) biotype has been released, resulting in substantial declines in Cyl. fulgida var. fulgida populations. A long-term monitoring programme has been initiated to evaluate the progress of this new cochineal insect biotype. The Harrisia mealybug, Hypogeococcus pungens Granara de Willink (Hemiptera: Pseudococcidae), which was originally released on Harrisia martinii (Labour.) Britton and Rose has been collected and redistributed onto Cereus jamacaru DC., where it reduces fruit production and leads to the death of both seedlings and large plants. Resolving taxonomic problems to ensure the correct identification of plant species and the most appropriate biological control biotypes have been key issues that have led to the successful control of several cactaceous weed species in South Africa.
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  • Date Issued: 2011

Biological control of Pereskia aculeata Miller (Cactaceae)

  • Authors: Paterson, Iain Douglas
  • Date: 2011
  • Subjects: Pereskia -- Biological control -- South Africa Cactus -- Biological control -- South Africa Invasive plants -- Biological control -- South Africa Curculionidae -- South Africa Pyralidae -- South Africa Insects as biological pest control agents -- South Africa
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5825 , http://hdl.handle.net/10962/d1007653
  • Description: Pereskia aculeata Miller (Cactaceae) is an environmental weed that is damaging to natural ecosystems in South Africa. The plant is native to Central and South America and was first recorded in South Africa in a botanical garden in 1858. In this thesis, research into the biological control of P. aculeata was conducted with the intention of improving the control of the weed. A pre-release study of the relationship between P. aculeata density and native plant biodiversity indicated that P. aculeata has a negative impact on native biodiversity. The native plant biodiversity associated with different P. aculeata densities was used to determine threshold values and goals for the control of the weed. A threshold value of 50% P. aculeata density was calculated, indicating that P. aculeata density must be maintained below 50% in order to conserve native plant biodiversity. The ultimate goal of the control programme should be to maintain P. aculeata densities below 30%. At these densities there was no significant difference in native plant biodiversity from if the weed were absent from the ecosystem. The biological control agent, Phenrica guérini Bechyne (Chrysomelidae), has been released in South Africa but the potential of the agent to impact P. aculeata is not known and no post release evaluation has been conducted. Impact assessment studies indicate that P. guérini does not impact P. aculeata, even at high densities, but the results of greenhouse experiments should be interpreted with caution because of problems with extrapolation into the field. Although observations in the field suggest that P. guérini has reduced P. aculeata densities at one site, it is clear that new biological control agents are needed to reduce the weed to acceptable levels. Identifying the origin of the South African P. aculeata population was believed to be important to the biological control programme due to the disjunct native distribution and intraspecific variation of the species. Natural enemies associated with plant genotypes in different parts of the native distribution may have developed specialised relationships with certain intraspecific variants of the plant, resulting in differences in agent efficacy on certain host plant genotypes. A molecular study indicated that the closest relatives to the South African weed population found in the native distribution were in Rio de Janeiro Province, Brazil. A bioassay experiment in which fitness related traits of the biological control agent, P. guérini, were measured on various P. aculeata genotypes was conducted to determine the importance of host plant intraspecific variation. There was little variation in fitness traits between genotypes and no evidence of intraspecific host plant specialization. Although intraspecific variation had no effect on agent efficacy in the case of P. guérini, it is possible that other natural enemies may be more specialized. Genotype matching is expected to be more important when natural enemies likely to be specialised to individual genotypes are considered for biological control. Potential biological control agents were prioritized from data collected on surveys in the native distribution. The most promising of these, based on the presence of feeding, incidence, predicted host range, climatic matching, genotype matching and mode of damage, are two species of Curculionidae, the current biological control agent P. guérini and the stem boring moth, Maracayia chiorisalis Walker (Crambidae). The two curculionid species and M. chlorisalis should be considered priorities for host specificity studies. Releases of P. guérini and any new biological control agents should be made at sites where the pre-release study was conducted so that post-release evaluation data can be compared with the pre-release data and the impact of biological control can be evaluated. Retrospective analyses of biological control programmes provide important ways of improving aspects of biological control programmes, such as methods of agent selection. The evaluation of success in biological control programmes is essential for retrospective analyses because factors that have lead to successes or failures can be analysed. Retrospective analyses of biological control programmes, such as this thesis, may improve weed management, thereby contributing to the conservation of natural resources.
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  • Date Issued: 2011

Biomechanical, physiological and perceptual responses of three different athlete groups to the cycle-run transition

  • Authors: Cripwell, Devin Matthew
  • Date: 2011
  • Subjects: Biomechanics -- Research , Human mechanics -- Research , Cycling -- Physiological aspects -- Research , Running -- Physiological aspects -- Research , Exercise -- Physiological aspects -- Research
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5106 , http://hdl.handle.net/10962/d1005184 , Biomechanics -- Research , Human mechanics -- Research , Cycling -- Physiological aspects -- Research , Running -- Physiological aspects -- Research , Exercise -- Physiological aspects -- Research
  • Description: The transition from cycling to running has been identified as one of the key determinants of success in triathlon, as it has been suggested that the cycle may affect subsequent running efficiency such that running performance is significantly altered or reduced. It is also suggested that athletes more adapted to the transition itself, rather than purely running or cycling, may be more efficient during the post-cycle running bout. The current study sought to investigate the effects of prior cycling on subsequent selected biomechanical, physiological and perceptual responses of three different athlete groups. Subjects were selected on the basis of their sporting background, and were divided into three groups – triathletes, cyclists and runners. Experimentation required subjects to perform a seven minute treadmill running protocol at 15km.h⁻¹, during which biomechanical (EMG, Stride rate, Stride length, Vertical acceleration), physiological (HR, VO₂, EE) and perceptual (RPE) responses were recorded. After resting, subjects were required to perform a twenty minute stationary cycle at 70% of maximal aerobic power (previously determined), immediately followed by a second seven minute treadmill running protocol during which the same data were collected and compared to those collected during the first run. Biomechanical responses indicate that the cycle protocol had no effect on the muscle activity or vertical acceleration responses of any of the three subject groups, while the triathlete group significantly altered their gait responses in order to preserve running economy. The triathlete group was the least affected when considering the physiological responses, as running economy was preserved for this group. The runner and cyclist groups were significantly affected by the transition, as running economy decreased significantly for these groups. Perceptual responses indicate that athletes more experienced with the transition may find the transition from cycling to running to be easier than those inexperienced in this transition. It is apparent that a high intensity cycle protocol has limited statistical impact on selected biomechanical responses, while physiological and perceptual responses were altered, during a subsequent run, regardless of athlete type. That said, the ability of transition-trained athletes to transition comfortably between disciplines was highlighted, which may have important performance implications.
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  • Date Issued: 2011

Biphenyl sorption to different soil clay minerals

  • Authors: Tandlich, Roman , Baláž, Štefan
  • Date: 2011
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/76869 , vital:30632 , https://doi.org/10.5897/AJAR10.1012
  • Description: Only limited information is available in the literature on the role of soil mineral surfaces in the sorption of hydrophobic organic pollutants. This knowledge gap is addressed through the assessment of biphenyl sorption to kaolinite, illite and bentonite; using the batch equilibration technique with incubations lasting 6 or 21 days at 28 ± 2°C in the dark [RT1]. Sorption of biphenyl onto kaolinite followed the Freundlich sorption isotherm, whereas linear sorption isotherms were observed on illite and bentonite [RT2]. The biphenyl sorption partition coefficient on kaolinite ranged from 0.1 to 9.1 cm3.g-1 after 6 days and no sorption was observed after 21 days. This could have been caused by a completely reversible sorption or a loss of binding capacity after 21 days [RT3]. The respective values of the biphenyl sorption partition coefficient on illite and bentonite ranged from 20.3 ± 0.3 to 120 ± 8 cm3.g-1.Sorption equilibrium on the internal clay surfaces was reached after 6 days, as indicated by the sorption data for illite and bentonite [RT4]. Access of biphenyl molecules to the internal clay surfaces is a function of the ionic strength of soil solution and the soil organic matter is the dominant site for biphenyl sorption after 6 to 21 days.
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  • Date Issued: 2011

Bluetooth audio and video streaming on the J2ME platform

  • Authors: Sahd, Curtis Lee
  • Date: 2011 , 2010-09-09
  • Subjects: Bluetooth technology , Mobile communication systems , Communication -- Technological innovations , Communication -- Network analysis , Wireless communication systems , L2TP (Computer network protocol) , Computer network protocols , Streaming audio , Streaming video
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4633 , http://hdl.handle.net/10962/d1006521 , Bluetooth technology , Mobile communication systems , Communication -- Technological innovations , Communication -- Network analysis , Wireless communication systems , L2TP (Computer network protocol) , Computer network protocols , Streaming audio , Streaming video
  • Description: With the increase in bandwidth, more widespread distribution of media, and increased capability of mobile devices, multimedia streaming has not only become feasible, but more economical in terms of space occupied by the media file and the costs involved in attaining it. Although much attention has been paid to peer to peer media streaming over the Internet using HTTP and RTSP, little research has focussed on the use of the Bluetooth protocol for streaming audio and video between mobile devices. This project investigates the feasibility of Bluetooth as a protocol for audio and video streaming between mobile phones using the J2ME platform, through the analysis of Bluetooth protocols, media formats, optimum packet sizes, and the effects of distance on transfer speed. A comparison was made between RFCOMM and L2CAP to determine which protocol could support the fastest transfer speed between two mobile devices. The L2CAP protocol proved to be the most suitable, providing average transfer rates of 136.17 KBps. Using this protocol a second experiment was undertaken to determine the most suitable media format for streaming in terms of: file size, bandwidth usage, quality, and ease of implementation. Out of the eight media formats investigated, the MP3 format provided the smallest file size, smallest bandwidth usage, best quality and highest ease of implementation. Another experiment was conducted to determine the optimum packet size for transfer between devices. A tradeoff was found between packet size and the quality of the sound file, with highest transfer rates being recorded with the MTU size of 668 bytes (136.58 KBps). The class of Bluetooth transmitter typically used in mobile devices (class 2) is considered a weak signal and is adversely affected by distance. As such, the final investigation that was undertaken was aimed at determining the effects of distance on audio streaming and playback. As can be expected, when devices were situated close to each other, the transfer speeds obtained were higher than when devices were far apart. Readings were taken at varying distances (1-15 metres), with erratic transfer speeds observed from 7 metres onwards. This research showed that audio streaming on the J2ME platform is feasible, however using the currently available class of Bluetooth transmitter, video streaming is not feasible. Video files were only playable once the entire media file had been transferred.
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  • Date Issued: 2011

Brand loyalty in the South African tyre industry

  • Authors: Stewart, Russel
  • Date: 2011
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: vital:8796 , http://hdl.handle.net/10948/d1015983
  • Description: The tyre industry plays an important role in the concept of mobility. Mobility defines the human need for transportation, which has been growing at an accelerated pace since the dawn of the nineteenth century. More importantly, modern mobility cannot be achieved without the use of a pneumatic tyre, a commodity that has become increasingly complex and competitive with countless brands and products available on a global scale. In order to stand out in this competitive market landscape, big brands attempt to build an amount of brand awareness within the market place, while maintaining a balance in creating a demand for their product in pull marketing strategies. While the market place becomes increasingly competitive on a both a global and local level, tyre brands are all trying various tactics in an effort to secure wheel positions on consumer’s vehicles. Within the marketing mix there are various strategies and tactics that can be adopted by tyre brands to secure a share of voice within the mind of the consumer when the need arises for new tyres, however in South Africa, only the established brands have the spending power to employ traditional media space in an effort to communicate with the consumer. It has also become increasingly difficult for established brands to remain dominant within the decision journey of consumers, especially when the retailer has the final contact with the consumer and may be promoting the purchase of a tyre brands that results in higher margins that the brand originally requested by the consumer. The tyre industry plays an important role in the concept of mobility. Mobility defines the human need for transportation, which has been growing at an accelerated pace since the dawn of the nineteenth century. More importantly, modern mobility cannot be achieved without the use of a pneumatic tyre, a commodity that has become increasingly complex and competitive with countless brands and products available on a global scale. In order to stand out in this competitive market landscape, big brands attempt to build an amount of brand awareness within the market place, while maintaining a balance in creating a demand for their product in pull marketing strategies. While the market place becomes increasingly competitive on a both a global and local level, tyre brands are all trying various tactics in an effort to secure wheel positions on consumer’s vehicles. Within the marketing mix there are various strategies and tactics that can be adopted by tyre brands to secure a share of voice within the mind of the consumer when the need arises for new tyres, however in South Africa, only the established brands have the spending power to employ traditional media space in an effort to communicate with the consumer. It has also become increasingly difficult for established brands to remain dominant within the decision journey of consumers, especially when the retailer has the final contact with the consumer and may be promoting the purchase of a tyre brands that results in higher margins that the brand originally requested by the consumer. The questions that remain are; do retailers have a high degree of influence on consumer behaviour or are high levels of brand awareness enough for a brand owner to be assured of a consistent demand on their product? This research aims to validate the interdependence of brand awareness and retailer influence on the consumer decision journey within the South African tyre industry. The research starts by setting the scene within the global and local tyre industry through the use of the Continental Corporation for illustration purposes. Once the scene is set in terms of the industry in which the research is taking place, brand theory is exhaustively discussed providing relevance and context within the tyre industry. Within the discussion of brand equity, the consumer decision journey and touch points are introduced as process and influence before the final purchase is made. With the theory of the tyre industry and branding covered, qualitative fieldwork was undertaken by two researchers at a tyre retail group in Tswane, South Africa. The fieldwork consisted of questionnaires that needed to be completed by consumers who had just concluded their purchase decision and were waiting in the retailer for the work to be concluded on their vehicle. The results of the fieldwork are extensively analysed and discussed upon which conclusions and recommendations for future research are drawn. The sample attained is sufficient for qualitative analysis; however the conclusions need to be read within the context of the sample size and geographical location in which the research was conducted. Further context was provided from the retail store owner who provided expert comment and insight based on experience within the industry and retail environment. The comment was utilised along with the theory to either validate or disprove findings, which formed the basis for recommendations for future research.
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  • Date Issued: 2011

Building employee value proposition for attracting and retaining talent in large organisations in South Africa

  • Authors: Chen, Shih-hwa James
  • Date: 2011
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:9121 , http://hdl.handle.net/10948/d1016056
  • Description: Globalisation of businesses and the advancement of information technology have changed the way employees think, live and behave. As a result, some of the traditional theories and models on talent management have been tested, and to some extent, challenged. Companies large and small must be creative, responsive and ready to let go outdated management practices when challenged by new paradigms to improve competitiveness and alignment to market needs. In the current climate of widespread skill shortages and declining workforce numbers, large organisations continue to wrestle with appropriate management practices that could truly protect their most valuable asset – its people. This research was aimed at providing an insight into what makes a good attraction and retention strategy for large organisations in South Africa. It further examined the principles which underpin an effective employee value proposition that would capture comprehensively the expectations, personal needs and career goals of the new generation employees especially in a developing economy. Quantitative data focusing on students‘ expectations on their future employer of choice was collected via a national survey distributed at 23 tertiary institutions in South Africa during career fairs. Qualitative data was collected through focus group discussions with a sample of SARS graduate employees. Triangulation of results was possible and the analysis of data provided scientific evidence for meaningful conclusions and recommendations. The findings of this research enabled the development of a structured argument in terms of what organisations need to start, stop and continue doing to improve the talent management practices for attracting, developing and retaining highly talented people. The research further enabled the identification of key components that are essential for building an attractive and practical EVP for large organizations that focus on enhancing the value of their talent in the 21st century.
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  • Date Issued: 2011

Business cycles and stock market performance in South Africa

  • Authors: Muchaonyerwa, Forward
  • Date: 2011
  • Subjects: Stock exchanges -- South Africa , Economic indicators -- South Africa , Business cycles -- South Africa , Economic forecasting -- South Africa , Stocks -- South Africa
  • Language: English
  • Type: Thesis , Masters , M Com
  • Identifier: vital:11460 , http://hdl.handle.net/10353/312 , Stock exchanges -- South Africa , Economic indicators -- South Africa , Business cycles -- South Africa , Economic forecasting -- South Africa , Stocks -- South Africa
  • Description: The study investigates the relationship between stock market performance and business cycles in South Africa for the period 2002-2009 using monthly data. This is done by constructing a Vector Error Correction Model (VECM). The study specifies a business cycle model with the business cycle coincident indicator (BC) regressed against, the All Share Price Index (ALSI), Real Effective Exchange Rate (REER), Money Supply (M1), Inflation (CPIX) and the Prime Overdraft Rate (POR). The ALSI represents stock market performance whilst the rest of the variables are to enhance model specification. The study found a positive relationship between stock market performance and business cycles in South Africa. The results also indicated that business cycles are positively related to the lagged variable of the coincident indicator and money supply. In addition, the findings also reveal that BC is negatively related to interest rates and the real effective exchange rate.
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  • Date Issued: 2011

Callenges facing school management teams in the general education and training band schools

  • Authors: Bafundi,Zealous Mapisa
  • Date: 2011
  • Language: English
  • Type: Masters theses , text
  • Identifier: http://hdl.handle.net/11260/3538 , vital:43625
  • Description: Abstract text The study investigated the factors that lead to the high failure rate of grade 12 learners of the two high schools in the Ngqeleni area of Libode Mega District of the Eastern Cape, South Africa. The study was qualitative in nature; therefore interviews were used as the method of collecting data. Seven SMT members, four parents and four learners were, randomly selected from the two schools in the Ngqeleni area of Libode Mega District. The researcher randomly selected the participants then interviewed them. The researcher used a video recoder as an instrument to record the responses from the participants. To analyse data, the researcher transcribed the interview responses and interpreted them. The main findings of the study showed that the high failure rate was caused by the following factors: over-croweded classes, shortage of teaching and learnin~ materials, lack of parental involvement, teachers' low morale, poor learner discipline, teachers experiencing problems in implementing government policies, work-load and as such teaching becoming stressful. The researcher in his study therefore recommends that the Department of Education plans more workshops for schools to capacitate them. There should be provision for more classrooms and incentives for teachers. Key Words: factors, high failure rate, grade 12, Ngqeleni area, Department of Education. , Thesis (MMED) -- Faculty of Educational Sciences, 2011
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  • Date Issued: 2011

Cattle manure, scalping and soil wetness effects on some physical properties of a hardsetting soil and associated early maize growth

  • Authors: Nciizah, Adornis Dakarai
  • Date: 2011
  • Subjects: Soil formation , Crops and soils , Manures , Soil mechanics , Soil moisture , Soil stabilization , Soil penetration test
  • Language: English
  • Type: Thesis , Masters , MSc Agric (Crop Science)
  • Identifier: vital:11861 , http://hdl.handle.net/10353/349 , Soil formation , Crops and soils , Manures , Soil mechanics , Soil moisture , Soil stabilization , Soil penetration test
  • Description: Most soils in the Eastern Cape Province, South Africa are shallow and are low in organic matter. Therefore these soils are structurally fragile and highly susceptible to inherent degradative processes like hardsetting. The objective of this study was to determine the effect of cattle manure, scalping and soil wetness on aggregate stability, penetration resistance and early maize growth in hardsetting soils. Glasshouse and field studies were conducted to determine the effect of cattle manure on aggregate stability and penetration resistance of freshly exposed topsoils by scalping at 0, 10 and 20 cm depths. In the glasshouse cattle manure was applied at 0 and 20 Mg/ha and matric suction was kept at ~ 30 and ~ 400 kPa; contrasting high and low soil wetness. Three soils were put in pots and arranged in a randomized complete block 3 2 2 factorial design. The field study was done at the University of Fort Hare research farm and the treatments were arranged in a split-plot complete randomized design with three replications. Scalping treatment was the main plot whilst the quantity of the cattle manure applied was the sub plot. Cattle manure increased mean weight diameter (MWD) by between 48% and 71% under glasshouse and between 18% and 33% under field conditions, depending on the soil wetting rate. Cattle manure reduced MWD when the soil under field condition was subjected to mechanical shaking. Soil penetration resistance decreased linearly, with increasing soil wetness but it rapidly increased with increase in matric suction up to ~200 kPa and thereafter the rate of increase reduced. In the glasshouse, all treatments had no significant effects on shoot dry weight but low matric suction increased root dry weight by 133%. Interaction of cattle manure and low matric suction reduced shoot length by 6%, shoot fresh weight by 25%, root surface area by 36%, root length by 5% and root fresh weight by 29% compared to the control. In contrast, application of cattle manure and high matric suction increased shoot length by 37%, shoot fresh weight by 136%, root surface area by 159%, root length by 94% and root fresh weight by 119%. In the field, cattle manure application increased root length density and shoot dry matter by 26% and 30% respectively. Cattle manure improved the stability of aggregates of the hardsetting soil under rapid or slow water intake conditions experienced during rainfall or irrigation. However, under field conditions cattle manure acted as a deflocculant and decreased the stability of aggregates when mechanical stress was applied. The effectiveness of cattle manure in improving maize growth in hardsetting soils was determined by matric suction.
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  • Date Issued: 2011
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