Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean
- Authors: Froneman, P William , Ansorge, Isabelle J , Richoux, Nicole B , Blake, Justin , Daly, Ryan , Sterley, Jessica A , Mostert, B , Heyns, Elodie R , Sheppard, Jill N , Kuyper, B , Hart, N , George, C , Howard, J , Mustafa, E , Pey, F , Lutjeharms, Johan R E
- Date: 2007
- Language: English
- Type: Article
- Identifier: vital:6966 , http://hdl.handle.net/10962/d1012030
- Description: A detailed hydrographic and biological survey was conducted in the region of the Subtropical Convergence in the Indian sector of the Southern Ocean in April 2007. Hydrographic data revealed that the subsurface expression of the Subtropical Convergence (at 200 m), marked by the 10°C isotherm, appeared to meander considerably between 41°S and 42°15’S. Total surface chlorophyll- a concentration was low and ranged from 0.03 to 0.42 µg l–1 and was always dominated by the pico- (<2 µm) and nano- (2–120 µm) size classes, which contributed between 81% and 93% of the total pigment. The total chlorophyll-a integrated over the top 150m of the water column showed no distinct spatial trends, and ranged from 12.8 to 40.1mg chl-a m–2. There were no significant correlations between the total integrated chlorophyll- a concentration and temperature and salinity (P > 0.05). The zooplankton community was dominated, numerically and by biomass, by mesozooplankton comprising mainly copepods of the genera, Oithona,Paraeuchaeta, Pleuromamma, Calanus and Clausocalanus. An exception was recorded at those stations in the region of the front where the tunicate, Salpa thompsoni, dominated the total zooplankton biomass.
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- Date Issued: 2007
The experience of AIDS orphans living in a township
- Authors: Frood, Sharron
- Date: 2007
- Subjects: Orphans -- South Africa , Children of AIDS patients -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10078 , http://hdl.handle.net/10948/505 , Orphans -- South Africa , Children of AIDS patients -- South Africa
- Description: One of the challenges facing health care professionals today is the phenomenon of rendering care to children who have been orphaned in the AIDS pandemic. The number of AIDS orphans in South Africa has risen out of all proportion and is causing existing health and social structures to become stretched in providing care to this vulnerable population of children. The objectives of this study are to explore and to describe the lived experience of children living in a township who have become AIDS orphans and to develop broad guidelines for Primary Health Care Nurses (PHCN’s), related professionals and partners involved in the care of AIDS orphans living in a township. The theoretical grounding of this study is found in Kotze’s Theory on Nursing Accompaniment (Kotzé, 1998:3). The proposed research design was based upon a qualitative study using an explorative, descriptive, contextual and phenomenological strategy of inquiry. Data was collected by means of in-depth interviews from a purposively selected sample and then analysed using the steps of qualitative data analysis proposed by Tesch (in Creswell, 1994). Guba’s model was used to assess the trustworthiness of the qualitative data. Based upon the findings, guidelines were developed to assist PHCN’s related professionals and partners involved in the care of AIDS orphans living in a township. Through this study the goal of the researcher was to give a voice to AIDS orphans living in a township and to represent accurately their lived experience.
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- Date Issued: 2007
Laboratory investigation of a load carriage task observed in forestry
- Authors: Furney, Sheena Elizabeth
- Date: 2007
- Subjects: Work -- Physiological aspects , Foresters -- Workload , Human engineering , Lifting and carrying
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5145 , http://hdl.handle.net/10962/d1008188 , Work -- Physiological aspects , Foresters -- Workload , Human engineering , Lifting and carrying
- Description: The objective of the present study was to investigate and compare the human responses to two load carriage tasks performed with three different load masses and on three different gradients. The task of carrying hydrogel in one hand was observed in a silviculture industry and crude physiological and perceptual responses were measured. This task was simulated in a laboratory setting together with a suggested intervention of backpack carriage. Eighteen conditions were established which consisted of the two modes of carriage and a combination of three load masses (9kg, 12kg and 15kg) and three gradients (5%, 10% and 15%). Twenty eight Rhodes University female students comprised the sample and the experimental procedures were conducted on a Quinton treadmill. Each participant was required to complete nine of the eighteen conditions which were each four minutes in duration. Postural changes were assessed using lateral and posterior digital images taken at the second and fourth minute and compression and shearing forces were estimated with the ErgolmagerTM Physiological responses (heart rate, ventilation and metabolic responses) were measured continuously with the Quark b² and perceptual responses ('central' and 'local' RPE) were measured every minute during the experimentation and body discomfort was rated at the completion of each condition. Overall responses revealed that hand carriage (146 bt.min⁻¹ , 25.09 mIO₂. kg-l.min⁻¹) was generally found to be more physiologically stressful than backpack carriage (130 bt.min⁻¹, 22.15 mIO₂.kg⁻¹ .min⁻¹) independent of load mass and gradient. Physiological responses were higher (113 bt.min-1 to 174 bt.min⁻¹ ) in responses to increasing gradient as opposed to increasing load mass (104 bt.min-1 to 153 bt.min⁻¹ ) for both backpack and hand carriage. Categorisation using the guidelines of Sanders and McCormick (1993) allowed for classification of conditions, with respect to physiological responses, into 'moderate', 'heavy' and 'very heavy' stress. For almost all of the physiological responses the majority of conditions which were classified as 'moderate' were backpack carriage conditions and the conditions classified as 'very heavy' were mostly hand carriage conditions. In terms of postural responses hand carriage resulted in more strain and greater compression and shearing forces on the spine. In terms of the compression forces increasing gradient had a greater affect on backpack carriage (681 N to 935 N) compared to hand carriage (570N to 793N). In contrast, increasing load mass had a larger affect on hand carriage postures and compression forces (751 N to 935N) in comparison to backpack carriage (723N to 780N). Shearing forces were found to be worse in hand carriage conditions overall. Although participants generally underrated perceived exertion in relation to cardiorespiratory responses, these perceptions revealed that backpack carriage, with a mean 'central' RPE of 12 compared to 11 for hand carriage, was somewhat preferred to hand carriage and that increasing gradient was perceived to be marginally more straining than increasing load mass.
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- Date Issued: 2007
A model for integrating information security into the software development life cycle
- Authors: Futcher, Lynn Ann
- Date: 2007
- Subjects: Computer security , Software maintenance
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9737 , http://hdl.handle.net/10948/506 , Computer security , Software maintenance
- Description: It is within highly integrated technology environments that information security is becoming a focal point for designing, developing and deploying software applications. Ensuring a high level of trust in the security and quality of these applications is crucial to their ultimate success. Therefore, information security has become a core requirement for software applications, driven by the need to protect critical assets and the need to build and preserve widespread trust in computing. However, a common weakness that is inherent in the traditional software development methodologies is the lack of attention given to the security aspects of software development. Most of these methodologies do not explicitly include a standardised method for incorporating information security into their life cycles. Meaningful security can be achieved when information security issues are considered as part of a routine development process, and security safeguards are integrated into the software application throughout its life cycle. This, in turn, will lead to users being more confident to use software applications, and to entrust today's computer systems with their personal information. To build better or more secure software, an improved software development process is required. Security of a software application must be based on the risk associated with the application. In order to understand this risk, the relevant information assets need to be identified together with their threats and vulnerabilities. Therefore, security considerations provide input into every phase of the Software Development Life Cycle (SDLC), from requirements gathering to design, implementation, testing and deployment. This research project presents a Secure Software Development Model (SecSDM) for incorporating information security into all phases of the SDLC, from requirements gathering to systems maintenance. The SecSDM is based on many of the recommendations provided by relevant international standards and best practices, for example, the ISO 7498-2 (1989) standard which addresses the underlying security services and mechanisms that form an integral part of the model.
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- Date Issued: 2007
A critical review of the IFIP TC11 Security Conference Series
- Authors: Gaadingwe, Tshepo Gaadingwe
- Date: 2007
- Subjects: Database security , Data protection , Computers -- Access control
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9795 , http://hdl.handle.net/10948/507 , Database security , Data protection , Computers -- Access control
- Description: Over the past few decades the field of computing has grown and evolved. In this time, information security research has experienced the same type of growth. The increase in importance and interest in information security research is reflected by the sheer number of research efforts being produced by different type of organizations around the world. One such organization is the International Federation for Information Processing (IFIP), more specifically the IFIP Technical Committee 11 (IFIP TC11). The IFIP TC11 community has had a rich history in producing high quality information security specific articles for over 20 years now. Therefore, IFIP TC11 found it necessary to reflect on this history, mainly to try and discover where it came from and where it may be going. Its 20th anniversary of its main conference presented an opportunity to begin such a study of its history. The core belief driving the study being that the future can only be realized and appreciated if the past is well understood. The main area of interest was to find out topics which may have had prevalence in the past or could be considered as "hot" topics. To achieve this, the author developed a systematic process for the study. The underpinning element being the creation of a classification scheme which was used to aid the analysis of the IFIP TC11 20 year's worth of articles. Major themes were identified and trends in the series highlighted. Further discussion and reflection on these trends were given. It was found that, not surprisingly, the series covered a wide variety of topics in the 20 years. However, it was discovered that there has been a notable move towards technically focused papers. Furthermore, topics such as business continuity had just about disappeared in the series while topics which are related to networking and cryptography continue to gain more prevalence.
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- Date Issued: 2007
Intermediating Africa:
- Authors: Garman, Anthea
- Date: 2007
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158806 , vital:40230 , https://hdl.handle.net/10520/EJC144693
- Description: In July, Vanity Fair, based in New York, did a unique special edition. Editor Graydon Carter explained how it came about: "Earlier this year, Mark Dowley, a marketing polymath at the Endeavour talent agency who has been involved with Bono's (Red) campaign from the start, called to inquire if I would be interested in having him guest edit an issue of the magazine. Interested? I'll say!".
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- Date Issued: 2007
Antjie Krog and the accumulation of ‘media meta‐capital’:
- Authors: Garman, Anthea
- Date: 2007
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159713 , vital:40336 , DOI: 10.1080/1013929X.2007.9678272
- Description: While Krog's significant body of work in poetry, prose and journalism is undoubtedly central in her trajectory towards international renown, in this essay I explore the dynamics of her “meteoric rise in status”. The news media's role in mediating Krog to the world for nearly 40 years becomes crucial to this investigation. I use a mix of media theory and field theory to illuminate the multi‐faceted and complex relationship Krog has had with the news media and I argue that her acquisition of ‘media meta‐capital’ has played a significant role in her attainment of a unique voice and speaking platform in a postapartheid, public domain in which few white voices, and especially Afrikaner ones, are being heard.
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- Date Issued: 2007
Enhancing phosphorus availability in some phosphate fixing soils of the Transkei region, South Africa using goat manure
- Authors: Gichangi, Elias Maina
- Date: 2007
- Subjects: Phosphorus in agriculture , Soils -- Phosphorus content , Phosphatic fertilizers , Soils -- Phosphorus content -- South Africa -- Transkei
- Language: English
- Type: Thesis , Doctoral , PhD (Soil Science)
- Identifier: vital:11960 , http://hdl.handle.net/10353/80 , Phosphorus in agriculture , Soils -- Phosphorus content , Phosphatic fertilizers , Soils -- Phosphorus content -- South Africa -- Transkei
- Description: Low availability of soil phosphorus (P) caused by strong sorption of P is a major constraint to agricultural production in most South African soils, particularly those from the high rainfall areas. The aim of this study was therefore to investigate whether combined addition of goat manure with inorganic P fertilizers could enhance P availability in some P fixing soils of the Transkei region, South Africa. The study addressed the following specific objectives (i) to assess P sorption capacities and requirements of selected soils and their relationship with selected soil properties and single point sorption test, (ii) to assess the effects of goat manure and lime addition on P sorption properties of selected P fixing soils (iii) to assess the temporal changes in concentration of inorganic and microbial biomass P fractions following application of inorganic fertilizer P with goat manure in a laboratory incubation experiment, and, (iv) to assess the effects of goat manure application with inorganic phosphate on inorganic and microbial biomass P fractions, P uptake and dry matter yield of maize. Sorption maxima (Smax) of seven soils examined ranged from 192.3 to 909.1 (mg P kg-1) and were highly and positively correlated with sorption affinity constant (r = 0.93, p = 0.01) and organic C (r = 0.71, p = 0.01). The amount of P required for maintaining a soil solution concentration of 0.2 mg P l-1 ranged from 2.1 to 123.5 mg P kg-1 soil. Soils collected from Qweqwe (a Cambisol), Qunu (an Acrisol), Ncihane (a Luvisol) and Bethania (a Ferralsol) had lower external P requirement values and were classified as lower sorbers, whereas soils from Ntlonyana (a Planosol), Chevy Chase (a Ferralsol) and Flagstaff (a Ferralsol) were classified as moderate sorbers. The results suggested that P availability could be compromised in 43 percent iii of the soils studied and that measures to mitigate the adverse effects of P sorption were needed to ensure that P is not a limiting factor to crop production, where such soils are found. Goat manure addition at varying rates (5, 10 and 20 tha-1 dry weight basis) to two of the moderately P fixing soils from Chevy Chase and Flagstaff, reduced P sorption maxima (Smax) compared to the control treatment. Phosphate sorption decreased with increasing amounts of goat manure in both soils but the extent of reduction was greater on Chevy Chase soil than on Flagstaff soil. The relative liming effects of the different rates of goat manure followed the order 20 t GM ha-1 > 10 t GM ha-1 > 5 t GM ha-1. In a separate experiment, addition of inorganic P at varying rates (0, 90, 180, and 360 kg P ha-1) to Flagstaff soil increased labile P fractions (resin P, biomass P and NaHCO3-Pi) and the increases were greater when goat manure was co-applied. The control treatments contained only 17.2 and 27.5 mg P kg-1 of resin extractable P in the un-amended and manure amended treatments, respectively which increased to 118.2 and 122.7 mg P kg-1 on day 28 of incubation. Biomass P concentration was increased from 16.8 to 43.9 mg P kg-1 in P alone treatments but the fraction was greatly enhanced with manure addition, increasing it from 32.6 to 97.7 mg P kg-1. NaOH-Pi was the largest extractable Pi fraction and ranged from 144.3 to 250.6 mg P kg-1 and 107.5 to 213.2 mg P kg-1 in the unamended and manure amended treatments, respectively. Dry matter yield and P uptake by maize grown in the glasshouse were highly and significantly (p = 0.05) correlated with the different P fractions in the soil. The correlations followed the order resin P (r = 0.85) > NaOH-Pi (r = 0.85) > NaHCO3-Pi (r = 0.84) >> biomass P (r = 0.56) for dry matter yield at 6 weeks after planting. At 12 weeks after planting, goat manure had iv highly significant effects on resin P and biomass P but had no effect on NaHCO3-Pi and NaOH–Pi. The combination of biomass P, resin P and NaHCO3-Pi explained 75.8 percent of the variation in dry matter yield of which 63.0 percent of the variation was explained by biomass P alone. The greatest increase in biomass P occurred when added P was co-applied with 5 or 10 tha-1 goat manure. The predictive equation for maize dry matter yield (DM) was: DM (g) = 1.897 biomass P + 0.645 resin P (r = 0.73). Resin P was the fraction that was most depleted due to plant uptake and decreased by 56 to 68 percent between the 6th week and the 12th week of sampling indicating that it played a greater role in supplying plant available P. The results therefore suggested that the use of goat manure may allow resource poor farmers to use lower levels of commercial phosphate fertilizers because of its effect to reduce soil P sorption. In addition, higher increases in biomass P due to manure addition observed at lower rates of added P indicated that goat manure has potential for enhancing bioavailability and fertilizer use efficiency of small inorganic P applications.
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- Date Issued: 2007
Lazarus in the Constitutional Court: an exhumation of the exceptio doli generalis
- Authors: Glover, Graham B
- Date: 2007
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70678 , vital:29688 , https://hdl.handle.net/10520/EJC53775
- Description: A landmark moment in the history of South African contract law was the emphatic interment of the exceptio doli generalis by Joubert JA in Bank of Lisbon and South Africa v De Ornelas 1988 (3) SA580 (A). Throughout most of the twentieth century, the exceptio doli generalis had been viewed as an equitable defence that allowed a defendant to resist a claim for performance under a contract when there was something unconscionable about the plaintiff's seeking to enforce the contract (or a clause thereof) in the specific circumstances of that case (see A J Kerr Principles of the Law of Contract 6 ed (2002) 637ff; P J Aronstam 'Unconscionable contracts: The South African solution?' (1979) 42 THRHR 21; P van Warmelo 'Exceptio doli' 1981 De Jure 202).
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- Date Issued: 2007
Engaging employees to build a performance culture in Telkom's NCC division
- Authors: Goliath, Elize
- Date: 2007
- Subjects: Performance -- Management , Quality assurance -- Management , Organizational effectiveness , Telkom (Firm : South Africa)
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8591 , http://hdl.handle.net/10948/1051 , Performance -- Management , Quality assurance -- Management , Organizational effectiveness , Telkom (Firm : South Africa)
- Description: Operating as a commercial company since October 1991, Telkom has grown into the largest communications services provider in Africa based on operating revenue and assets. The Group, consisting of the fixed-line company Telkom and a 50 per cent shareholding in mobile operator Vodacom. Telkom has changed its vision to the following: “To be a leading customer and employee centric ICT solutions service provider”. The company has been retrenching staff since 1999 and the staff numbers have reduced significantly from approximately 65 000 people to 25 575 people in 2006. The focus has been on increasing shareholder value and the staff feel that their value has not been recognised. The research paper focused on the extent that employees engaged to build a performance culture in Telkom’s NCC division. The following research methodology was followed: - A literature survey to determine factors or behaviours that will enhance employee engagement in building a performance culture and what Telkom NCC can do to build the workplace that will foster higher levels of employee engagement. - A survey was conducted to determine what the engagement levels of employees are at Telkom NCC, what stops the employees from doing their best and what Telkom NCC division can do to show they care and value their staff as according to their employees by means of a questionnaire. - The findings from the literature study and empirical study would be used to determine to what extent are employees engaged to build a performance culture in Telkom’s NCC division. A self administered questionnaire was used to collect the data required for this research. In conclusion it was said that employee engagement is a partnership between the company and the employees where everyone works together to achieve the business objectives of the company and the personal aspirations of employees. The organization has the responsibility to create the conditions for this to happen (Understanding Employee Engagement, 2004: 2). It was recommended that in order for NCC to enhance their employees attitudes toward the promoters’ team especially in terms of pride, strong attachment, feeling part of the family and motivating employees to do well promoters must concentrate on building relationships with their teams and individual members of the team. Employees must also be given decision making power for implementing the idea. NCC should educate their leaders on the value of recognition and the best way to go about it. In order for employees to grow and be promoted into higher positions, NCC must consider that if positions become available that they first be advertised in the NCC division before it be made available to the rest of the company.
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- Date Issued: 2007
Statistical analyses of artificial waterpoints: their effect on the herbaceous and woody structure composition within the Kruger National Park
- Authors: Goodall, Victoria Lucy
- Date: 2007
- Subjects: South African National Parks , Ecology -- Statistical methods , Regression analysis , Log-linear models , Game reserves -- South Africa , Kruger National Park (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5570 , http://hdl.handle.net/10962/d1002810 , South African National Parks , Ecology -- Statistical methods , Regression analysis , Log-linear models , Game reserves -- South Africa , Kruger National Park (South Africa)
- Description: The objective of this project is to link the statistical theory used in the ecological sciences with an actual project that was developed for the South African National Parks Scientific Services. It investigates the changes that have occurred in the herbaceous and woody structure due to the closure of artificial waterpoints; including the impacts that elephants and other herbivores have on the vegetation of the Kruger National Park. This project was designed in conjunction with South African National Parks (SANP) Scientific Services and it is a registered project with this department. The results of this project will be submitted to Scientific Services in accordance with the terms and conditions of a SANP research project. A major concern within the KNP is the declining numbers of rare antelope and numerous projects have been developed to investigate possible ways of halting this decline and thus protecting the heterogeneity of the Kruger National Park. Three different datasets were investigated, covering three aspects of vegetation structure and composition within the KNP. The first investigated the changes that have occurred since the N'washitsumbe enclosure in the Far Northern KNP was fenced off from the rest of the park. The results show that over the 40 years since the enclosure was built, changes have occurred which have resulted in a significant difference in the abundance of Increaser 2 and Decreaser grass species between the inside and the outside of the enclosure. Increaser 2 and Decreaser categories are the result of a grass species classification depending on whether the species thrives or is depressed by heavy grazing. The difference in grass species composition and structure between the inside and the outside of the enclosure indicates that the grazing animals within the KNP have influenced the grass composition in a way that favours the dominant animals. This has resulted in a declining roan antelope population - one of the species that is considered as a 'rare antelope'. Many artificial waterpoints (boreholes and dams) have also been closed throughout the KNP in the hope of resulting in a change in vegetation structure and composition in favour of the roan. Veld condition assessment data for 87 boreholes throughout the Park was analyzed to determine whether the veld in the vicinity is beginning to change towards a more Decreaser dominated sward which would favour the roan. The results were analyzed for the different regions of the Park; and they indicate that changes are becoming evident; however, the results are not particularly conclusive, yet. The majority of the boreholes were closed between 1994 and 1998 which means that not a lot of data were available to be analyzed. A similar study conducted in another 10 years time might reveal more meaningful results. However the results are moving in the direction hoped for by the management of the KNP. The results show that the grass composition has a higher proportion of Decreaser grasses since the closure of the waterpoints, and the grass biomass around these areas has also improved. The results were analyzed on an individual basis; and then on a regional basis as the minimal data meant that the individual analyses did not provide any significant results. A third study was then done on the impact that the rapidly increasing elephant population on the vegetation within the Riparian zone along three rivers in the Far Northern region of the KNP. The riparian zone is an important part of the landscape, in terms of providing food for many animals as well as shade. The elephant population has increased substantially since the termination of the culling program and this means that the feeding requirements of the population has increased which could result in severe damage upon the vegetation, as elephants can be very destructive feeders. The results show surprising differences between the three years of data that were analyzed; however the results indicate that the elephants are targeting specific height ranges of trees when feeding; however they do not seem to consistently target specific tree species. This is positive for the diversity of the Riparian zone as this region is very important both ecologically and aesthetically for the tourists who visit the Park.
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- Date Issued: 2007
The effective combating of intrusion attacks through fuzzy logic and neural networks
- Authors: Goss, Robert Melvin
- Date: 2007
- Subjects: Computer security , Fuzzy logic , Neural networks (Computer science)
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9794 , http://hdl.handle.net/10948/512 , http://hdl.handle.net/10948/d1011917 , Computer security , Fuzzy logic , Neural networks (Computer science)
- Description: The importance of properly securing an organization’s information and computing resources has become paramount in modern business. Since the advent of the Internet, securing this organizational information has become increasingly difficult. Organizations deploy many security mechanisms in the protection of their data, intrusion detection systems in particular have an increasingly valuable role to play, and as networks grow, administrators need better ways to monitor their systems. Currently, many intrusion detection systems lack the means to accurately monitor and report on wireless segments within the corporate network. This dissertation proposes an extension to the NeGPAIM model, known as NeGPAIM-W, which allows for the accurate detection of attacks originating on wireless network segments. The NeGPAIM-W model is able to detect both wired and wireless based attacks, and with the extensions to the original model mentioned previously, also provide for correlation of intrusion attacks sourced on both wired and wireless network segments. This provides for a holistic detection strategy for an organization. This has been accomplished with the use of Fuzzy logic and neural networks utilized in the detection of attacks. The model works on the assumption that each user has, and leaves, a unique footprint on a computer system. Thus, all intrusive behaviour on the system and networks which support it, can be traced back to the user account which was used to perform the intrusive behavior.
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- Date Issued: 2007
A multiple case study of parent involvement with grade 8 learners of mathematics
- Authors: Govender, Vasuthavan Gopaul
- Date: 2007
- Subjects: Education, Secondary -- Parent participation , Parent-teacher relationships , Mathematics -- Study and teaching (Secondary)
- Language: English
- Type: Thesis , Doctoral , DEd
- Identifier: vital:9556 , http://hdl.handle.net/10948/511 , http://hdl.handle.net/10948/d1011913 , Education, Secondary -- Parent participation , Parent-teacher relationships , Mathematics -- Study and teaching (Secondary)
- Description: The learning of mathematics is a worldwide concern. International studies over the last decade place South African learners amongst the lowest achievers. Although various initiatives have been tried there does not seem to be any improvement. In the USA and UK initiatives include the involvement of parents and these have been implemented with great success. One of the parent involvement programmes from the USA, the Family Maths Programme has been in South Africa since 1996. This programme has been successful in South Africa but is confined to parents of grades 4-7 children. However, there is no programme for parents of high school learners. As grade 8 is usually the first high school year in South Africa, this study focuses on parents of grade 8 children and their involvement in their children’s mathematics learning. It consists of an initial survey of grade 8 parents’ (from an urban school) mathematical backgrounds and experiences and their involvement in their children’s education. Using key points from the survey and elements from the literature review and other sources, the researcher designed a parent assistance programme for mathematics which was conducted with three groups of parents of grade 8 children from the same high school. Each group of parents was exclusive and the same set of procedures was applied to each group, making this study a qualitative multiple case study, within the interpretive research paradigm. The parent-assistance programme consists of a parents’ workshop and completion of journals over a 7-week period. Parents documented their interactions with their children in structured journals, a process known as participant journaling. After this journaling period, parents and children were surveyed on this interaction by means of follow-up questionnaires. This was followed later in interviews with the parents and mathematics teachers, separately. After the completion of all three case studies parents and children participated in focus group discussions to discuss and share experiences of the programme. The interrogation of the data, on two levels, suggests parents’ and children’s perceptions of mathematics were likely to be positively influenced. The data also suggest that children were likely to become more confident and to improve in mathematics.
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- Date Issued: 2007
The community structure and feeding ecology of the ichthyofauna in the Mngazana and Mngazi estuaries, Port St. Johns, South Africa
- Authors: Grant, Walter Lawrence
- Date: 2007
- Subjects: Estuarine fishes -- South Africa -- Eastern Cape , Fish communities -- South Africa -- Eastern Cape , Estuaries -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10713 , http://hdl.handle.net/10948/513 , http://hdl.handle.net/10948/d1012017 , Estuarine fishes -- South Africa -- Eastern Cape , Fish communities -- South Africa -- Eastern Cape , Estuaries -- South Africa -- Eastern Cape
- Description: The Mngazana and Mngazi estuaries are situated just south of Port St. Johns close to the biogeographical boundary between the warm temperate and subtropical zones along the east coast of Southern Africa. The Mngazana estuary is a permanently open estuary with three species of mangrove. The Mngazi estuary is a temporarily open/closed system. The ichthyofauna was sampled with seine nets and gillnets during June 2005, August 2005, November 2005, February 2006 and April 2006. The fish community structure was significantly different between the two estuaries with the differences being especially noticeable in the larger fish sampled with gillnets. There were significant differences in the fish community sampled with the seine net on both spatial and temporal scales in both of the estuaries. Certain warm temperate species were less abundant and certain subtropical species were more abundant at the Mngazana estuary than they were during a study conducted in 1975. Stomach content analysis revealed that most species had similar diets in the two estuaries with the only differences occurring among benthic feeding species. The diet of sub-adult piscivores comprised of a large proportion of penaeid prawns while the juveniles feed mainly on mysids. The zooplanktivorous fish feed mainly on copepods and mysids with the proportions varying between the species. Benthic feeding fishes showed the greatest variability in diet with plant material, detritus, crabs and copepods being the main food sources. Stable isotopes revealed that particulate organic matter and microphytobenthos were the most important carbon sources to fish in the Mngazi estuary. In the Mngazana estuary a combination of mangrove material, detritus, particulate organic matter and Zostera material were the most important carbon sources. The importance of each of these sources did, however, vary greatly between the different trophic guilds of the fish in the Mngazana estuary. The distribution of certain fish species was investigated in relation to physical parameters (temperature, salinity, turbidity and depth) and biological parameters (prey and predators) in the environment. It was found that most small fish (< 100 mm SL) were strongly correlated with turbidity where-as they showed weak correlations with their prey. Sub-adult piscivores fell into two groups, i.e. those that could tolerate turbid water and those that were only found in clear water. The group that also occurred in turbid water showed very strong correlations with their prey but the clear water group did not. It would appear that the small and thus vulnerable fish seemed to occur in areas that offered them protection rather than areas where their food supply is most abundant, where-as the piscivores were more influenced by prey distribution, as long as the physical conditions were tolerable to them.
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- Date Issued: 2007
The influence of service quality perceptions and customer satisfaction on patients' behavioural intentions in the healthcare industry
- Authors: Gray, Beverley Ann
- Date: 2007
- Subjects: Patient satisfaction -- South Africa , Medical care -- South Africa -- Evaluation , Hospitals, Proprietary -- Consumer satisfaction -- South Africa , Hospital patients -- South Africa -- Attitudes
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:9294 , http://hdl.handle.net/10948/514 , Patient satisfaction -- South Africa , Medical care -- South Africa -- Evaluation , Hospitals, Proprietary -- Consumer satisfaction -- South Africa , Hospital patients -- South Africa -- Attitudes
- Description: Healthcare today has become a competitive industry, not only locally, but on a global level as well. In the South African economy the healthcare sector presently offers healthcare seekers two options to satisfy their healthcare needs – either through private business enterprises in the private sector or public enterprises in the public sector. Likewise, in the healthcare sector's hospital environment, patients can receive treatment from either private or public hospitals. As private business enterprises offering a relatively 'pure', but generally unsought-after service, private hospitals compete aggressively to attract patients. Patients are a hospital's lifeblood and they rightfully expect a high standard of customer service throughout the stay. With today's consumers being better informed, more sophisticated and more demanding than in the past, experts agree that the key to survival in the service industry today, almost without exception, is the quality of the service. The cornerstone of the service industry is without doubt the ability to deliver superior service quality that results in customer satisfaction. And the healthcare industry is no exception. Most consumers will experience a need for healthcare services at some time in their lives, but in South Africa, escalating medical costs in general and private hospitals in particular, have made private healthcare increasingly more expensive for the majority of the country's healthcare seekers. This situation raises the question of customer service in the private hospital industry and how patients' perceive service quality and evaluate customer satisfaction after a hospital stay. There is a growing body of empirical evidence from United States studies to show that service quality and customer (patient) satisfaction positively influence patients' behavioural intentions to reuse the hospital or recommend it to others (word-of-mouth endorsements). However, in South Africa, empirical studies to investigate these relationships have not been adequately addressed. This study was therefore an attempt to address the lack of scientific evidence and debate in the area of patient satisfaction. Against this background, the primary objective of this study was to measure patients' perceptions of service quality and customer satisfaction with a private hospital experience and to estimate the effect that each of these constructs will have on future behavioural intentions. More specifically, the present study was an attempt to assess empirically the most important dimensions of service quality and transaction-specific customer satisfaction dimensions that drive both patient loyalty and ‘overall’ or cumulative satisfaction in the South African private hospital industry. For the purpose of this study, buying intentions was used as a surrogate measure of loyalty as measured by willingness to reuse the hospital and/or willingness to recommend it to others (word-of-mouth endorsements). Initial exploratory research was conducted with the aim of assessing the views of three private hospital stakeholder groups, namely former patients, doctors and management about what the quality of service and customer satisfaction meant to each individual interviewed. A service enterprise that specialises in patient satisfaction surveys in the US provided particularly useful information during this phase of the study. Several case studies of patient satisfaction programmes, mostly at US hospitals, provided additional insights in this area. The study was conducted nationally at private hospitals owned by one of South Africa's three major hospital groups. Five private hospitals in four major centres were selected on a non-probability convenience basis to participate in the study. The hospital group's senior management and the management at each selected hospital gave their full commitment to ensure that the survey was successfully conducted in their hospital wards. Data were collected by means of a quantitative study using a selfadministered, structured questionnaire. Patients had to meet certain qualifying criteria which included being of adult age, in the hospital for an operation and at least one overnight stay. A total of 3 800 questionnaires was distributed to patients on a random basis in selected wards at the five hospitals by senior hospital staff designated for this task. From this distribution, 425 questionnaires were returned of which a final sample of 323 could be statistically analysed. To confirm the internal reliability of the measuring instrument, Cronbach alpha coefficients were calculated for each of the factors identified by the exploratory factor analysis. In order to assess the discriminant validity of the measuring instrument used to measure both service quality and customer satisfaction, the items were subjected to an exploratory factor analysis. The factors that emerged after the exploratory factor analysis were then used as independent variables in the four subsequent multiple regression analyses to assess the study's four hypothesised relationships. The findings revealed that the service quality dimensions that impact positively on both loyalty and cumulative satisfaction are Empathy of nursing staff and Assurance. The customer satisfaction dimensions to impact positively on both loyalty and cumulative satisfaction are Satisfaction with the nursing staff, Satisfaction with meals, and Satisfaction with fees charged.
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- Date Issued: 2007
Apprenticing learners in the context of the Grade 10 physical science classroom
- Authors: Gray, Wesley Barclay
- Date: 2007
- Subjects: Science -- Study and teaching (Secondary) -- South Africa. Education, Bilingual -- South Africa Language and education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1423 , http://hdl.handle.net/10962/d1003304
- Description: The number of African learners who participate and succeed in physical science is recognized to be ‘disturbingly low’. One of the factors attributed to the low levels of enrolment and performance in physical science is language. In this study, teaching and learning through the language of science is examined in the context of the bilingual classroom. A model of analysis is constructed that (1) extends the notion of the language of science to include the mathematical and visual ‘languages’ of science, (2) takes recognition of the manner in which language, content, and values and beliefs construct the science learner, and (3) moves beyond the characterization of teaching and learning according to the dichotomy of the ‘traditional’/ the ‘progressive’. The model of analysis draws upon the central concepts of a sociocultural model of pedagogy, namely the ‘developmental model’. In addition, the model of analysis makes use of Systemic Functional Linguistics to examine teaching and learning at the micro level of classroom interaction. This study reveals the complex nature in which the language, content, and values and beliefs change as a lesson unfolds: teaching and learning through the language of science has been shown in these classrooms to be marked by features of both a ‘traditional’ and a ‘progressive’ model – each of which appears to serve different functions in the overall construction of the science learner. In addition, this study begins to uncover how a ‘successful’ teacher equips his/ her learners in the context of the bilingual physical science classroom: teaching and learning through the language of science has been shown in these classrooms to incorporate complex and varied strategies that depend upon choices made by both the teacher and learners. These findings substantiate the need to understand the challenges teachers and learners face in the bilingual physical science classroom in ways that acknowledge the complexity of the teaching and learning process.
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- Date Issued: 2007
Karen Horney : a psychobiographical study
- Authors: Green, Sarah-Jane
- Date: 2007
- Subjects: Horney, Karen, 1885-1952 Women psychologists Levinson, Daniel J., d.1994 Levinson, Daniel J., d.1994 -- The seasons of a woman's life
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3186 , http://hdl.handle.net/10962/d1008374
- Description: This psychobiography on the life of Karen Horney is an exploratory-descriptive study that aims to explore and describe Horney's life structure development according to Daniel Levinson's (1996) theory of adult development. The method of research uses a qualitative single-case research design that studies her life over her entire lifespan and highlights the individual characteristics of Horney in a holistic manner within her socio-historical context. A purposive sampling procedure was used to select Karen Horney as the subject of the research and only published data was analyzed in the research. Multiple sources of data are used to obtain the information in this research, including an autobiography and three biographies written by three different authors. This data is organized according to the temporal sequence of her lifespan and the developmental periods and time frame of Levinson's theory. Horney's life is described and explored to highlight those areas of her life that conform to the developmental theory and those aspects of her life that are not included in the theoretical constructs of Levinson 's theory. By exploring the significant relationships that Horney developed throughout her life with family, friends, work colleagues, community and religious affiliations, and the important issues in her development, this study verifies Levinson's theory by corroborating his conceptualisation of adult development as a process of sequential stages divided into four main eras of development, linked by three periods of transition. A shortcoming of Levinson's theory relates to his omission of self-esteem issues and religious concerns as relevant factors experienced during the era of pre-adulthood and spiritual concerns during the era of late adulthood.
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- Date Issued: 2007
AfrOBIS: a marine biogeographic information system for sub-Saharan Africa
- Authors: Grundlingh, M L , St Ange, U B , Bolton, John J
- Date: 2007
- Language: English
- Type: Article
- Identifier: vital:7137 , http://hdl.handle.net/10962/d1011813
- Description: AfrOBIS is one of 11 global nodes of the Ocean Biogeographic Information System (OBIS), a freely accessible network of databases collating marine data in support of the Census of Marine Life.Versatile graphic products, provided by OBIS, can be used to display the data. To date, AfrOBIS has loaded about 3.2 million records of more than 23 000 species located mainly in the seas around southern Africa. This forms part of the 13.2 million records of more than 80 000 species currently stored in OBIS. Scouting for South African data has been successful, whereas locating records in other African countries has been much less so.
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- Date Issued: 2007
Development of a web-based interface for a wireless sensor network monitoring system
- Authors: Gumbo, Sibukele
- Date: 2007
- Subjects: Wireless LAN , Sensor networks , Wireless communication systems , Web sites -- Design , User interfaces (Computer systems)
- Language: English
- Type: Thesis , Masters , MSc (Computer Science)
- Identifier: vital:11372 , http://hdl.handle.net/10353/68 , Wireless LAN , Sensor networks , Wireless communication systems , Web sites -- Design , User interfaces (Computer systems)
- Description: In the recent past, wireless sensor technology has undergone advancements in its autonomous data collecting aspects, and has become an area worth investigating in relation to structural monitoring applications. The system described in this thesis aims at acquiring, storing and displaying overhead transmission line related data collected from a wireless sensor network. Open source tools were used in its development and implementation. The inherent linearly aligned topology of transmission line monitoring devices is not without shortcomings; hence analysis of linear node placement, hardware and software components was carried out to determine the feasibility of the system. Their limited data processing capabilities has motivated the development of a post processing wireless sensor application in order to present any collected structural data in an understandable format.
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- Date Issued: 2007
Perceptions of selected beneficiaries regarding government grants for sustainable development projects
- Authors: Gwam, Zukiswa Sylvia
- Date: 2007
- Subjects: Sustainable development -- South Africa , Government aid -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9989 , http://hdl.handle.net/10948/517 , Sustainable development -- South Africa , Government aid -- South Africa
- Description: The overall aim of the study was to explore and describe the perceptions of beneficiaries of government grants for the sustainability of development projects. A qualitative method was used following an explorative and descriptive design, as the researcher seeks to understand paradigm shifts from a welfare perspective to a developmental perspective. The qualitative approach is most suitable when the aim of the researcher is to understand a phenomenon from the point of view of participants (Creswell, 1998:17) and to elicit thought processes and feelings (Straus and Corbin, 1998:11). The methods of data collection included in-depth semi-structured interviews, field notes as well as the use of focus groups. The semi-structured interviews allowed the researcher to ask specific questions in an open-ended manner when necessary. Data analysis was done according to Tesch’s eight steps for analyzing qualitative research data (Creswell, 1994: 154-155). Guba’s model was used to assess the trustworthiness of research findings for ensuring trustworthiness in qualitative research (Krefting, 1990: 214-222). It is envisaged that this study will provide insights into the perceptions of beneficiaries of government social development grants. Findings indicate that a great deal of skills development for sustainability of development projects is needed, and will be used for further research in the area of social development.
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- Date Issued: 2007