The initial grounding of rational numbers : an investigation
- Authors: Brown, Bruce John Lindsay
- Date: 2007
- Subjects: Number theory Numbers, Rational -- Study and teaching (Elementary) Numeracy -- Study and teaching (Elementary) Mathematics -- Study and teaching (Elementary)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1904 , http://hdl.handle.net/10962/d1006351
- Description: This small scale exploratory research project investigated the grounding of rational number concepts in informal, everyday life situations. A qualitative approach was taken to allow for the identification and then in depth investigation, of issues of importance for such a grounding of rational number understanding. The methodology followed could be seen as a combination of grounded theory and developmental research. And the data was generated through in-depth and clinical interviews structured around a number of grounded tasks related to rational numbers. The research comprised three cycles of interviews that were transcribed and then analysed in detail, interspersed with periods of reading and reflection. The pilot cycle involved a single grade three teacher, the second cycle involved 2 grade three teachers and the third cycle involved 2 grade three children. The research identified a number of different perspectives that were all important for the development of a fundamental intuitive understanding that could be considered personally meaningful to the individual concerned and relevant to the development of rational number concepts. Firstly in order to motivate and engage the child on a personal level the grounding situation needed to be seen as personally significant by the child. Secondly, coordinating operations provided a means of developing a fundamental intuitive understanding, through coordination with affording structures of the situation that are relevant to rational numbers. Finally, goal directed actions that are deliberately structured to achieve explicit goals in a situation are important for the development of more explicit concepts and skills fundamental for rational number understanding. Different explicit structures give rise to different interpretations of rational numbers in grounding situations. In addition to these perspectives, it became evident that building and learning representations was important for developing a more particularly mathematical understanding, based on the fundamental understanding derived from the child's grounded experience. The conclusion drawn in this research as a result of this complexity, is that to achieve a comprehensive and meaningful grounding, children's learning of rational numbers will not follow a simple linear trajectory. Rather this process forms a web of learning, threading coordinating operations for intuitive development, interpretations for explicit grounding and representations to develop more formal mathematical conceptions.
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The microbial ecology of sulphidogenic lignocellulose degradation
- Authors: Clarke, Anna Maria
- Date: 2007
- Subjects: Microbial ecology , Lignocellulose , Sulfides , Lignin , Lignocellulose -- Biodegradation , Mines and mineral resources -- Waste disposal , Acid mine drainage
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4094 , http://hdl.handle.net/10962/d1008181
- Description: Acid mine drainage is a well known environmental pollutant, not only in South Africa, but throughout the world, and the use of microbial processes in the treatment of these wastes has been the subject of investigation over past decades. Lignocellulose packed-bed reactors have been used in passive treatment systems, and, although effective initially, they show early decline in performance while the packing material remains largely un-utilized. Little is known about this phenomenon which remains a severe constraint in the development of efficient passive mine water treatment systems. It has been proposed that the degradation pathways of the complex lignocellulose substrate may be limited in some way in these systems during the manifestation of this effect. This study has addressed the problem using a molecular microbial ecology methodology in an attempt to relate trophic functions of the microbial population to the physico-chemical data of the system. A field-scale lignocellulose packed-bed reactor located at Vryheid Coronation Colliery (Northern Kwa-Zulu Natal province, South Africa) was monitored for six years and the results showed the classic profile of performance decline related to a slowdown in sulphate reduction and alkalinity production. The reactor was decommissioned , comprehensive samples were collected along the depth profile and the microbial populations investigated by means of 16S rRNA gene methodology. The population was found to include cellulolytic Clostridia spp., CytophagaIFlavobacterlBacteroidetes, Sphingomonadaceae and as yet uncultured microorganisms related to microbiota identified in the rumen and termite gut. These are all known to be involved as primary fermenters of cellulose. Oesulphosporosinus was present as sulphate reducer. A comparison of substrata sampling and population distribution suggested that spatial and temporal gradients within the system may become established over the course of its operation. Based on these findings, a laboratory-scale reactor was constructed to simulate the performance of the packed-bed reactor under controlled experimental conditions. The laboratory-scale reactor was operated for 273 days and showed comparable performance to that in the field in both biomolecular and physicochemical data. Clearly defined trophic niches were observed. These results suggested that a sequence of events does occur in lignocellulose degradation over time. Based on the spatial and temporal column studies, a descriptive model was proposed to account for these events. It was found that fermentative organisms predominate in the inlet zone of the system using easily extractable compounds from the wood, thus providing feedstock for sulphate reduction occurring in the succeeding compartments. Production of sulphide and alkalinity appears to be involved in the enhancement of lignin degradation and this, in turn, appears to enhance access to the cellulose fraction. However, once the readily extractables are exhausted, the decline in sulphide and alkalinity production leads inexorably to a decline in the overall performance of the system as a sulphate reducing unit operation. These observations led to the proposal that with the addition of a limited amount of a readily available carbon source, such as molasses, in the initial zone of the the reactor, the ongoing generation of sulphide would be sustained and this in turn would sustain the microbial attack on the lignocellulose complex. This proposal was tested in scale-up studies and positive results indicate that the descriptive model may, to some extent, provide an account of events occurring in these systems. The work on sustaining lignocellulose degradation through the maintenance of sulphate reduction in the initial stages of the reactor flow path has led to the development of the Degrading Packed-bed Reactor concept and that, has subsequently been successfully evaluated in the field.
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The mutual embodiment of landscape and livelihoods: an environmental history of Nqabara
- Authors: De Klerk, Henning
- Date: 2007
- Subjects: Land reform -- South Africa -- Eastern Cape , Human ecology -- South Africa -- Eastern Cape , Human beings -- Effect of environment on -- South Africa -- Eastern Cape , Land use -- Environmental aspects -- South Africa -- Eastern Cape , Landscapes -- Social aspects -- South Africa -- Eastern Cape , Landscape ecology -- South Africa -- Eastern Cape , Land use, Rural -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4750 , http://hdl.handle.net/10962/d1007054 , Land reform -- South Africa -- Eastern Cape , Human ecology -- South Africa -- Eastern Cape , Human beings -- Effect of environment on -- South Africa -- Eastern Cape , Land use -- Environmental aspects -- South Africa -- Eastern Cape , Landscapes -- Social aspects -- South Africa -- Eastern Cape , Landscape ecology -- South Africa -- Eastern Cape , Land use, Rural -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape
- Description: This thesis presents a history of the landscape of Nqabara, an administrative area in a rural and coastal area of the Eastern Cape Province, South Africa. In the process of investigating landscape history, the inquiry engages with a range of data sources from diverging discursive contexts, including data from ethnographic fieldwork, from the consultation of archival documents and historical reports as well as from comparative historic and ethnographic research, necessitating a critical consideration of the epistemological contexts of data production and the dialogue between researcher and data. Furthermore, in its aim to move beyond historical description towards explanation, the study interrogates the dualist ontological conceptualisations of nature and culture, society and ecology, object and meaning upon which are built three dominant conceptual frameworks concerned with human-environment relationships: social-ecological systems theory, transdisciplinary landscape studies and political ecology. Drawing primarily upon the works of James Gibson, Anthony Giddens and Tim Ingold, an ontological foundation is developed to guide the enquiry and move towards an alternative understanding of the relationship of people’s livelihoods with respect to the landscape in which it is lived, which I call here the praxisembodiment perspective. This ontology takes the situated patterns of action of a situated agent-in-its-environment as its point of departure and proceeds to develop a framework explaining how relations among the patterns of action of different agents-in-their-environment, emerge in structures that simultaneously enable and constrain future action. The foundation is thereby provided for a monist understanding of how landscape and social structure emerge simultaneously from the complex intersection of patterns of actions and interactions of agents in their environment. This framework calls for an understanding of time, space and scale, not as independent variables influencing process and action, but as emergent properties arising from the patterns of actions of situated agents. Finally the alternative ontology is applied to the history of landscape and livelihoods of people of Nqabara. It is concluded that an appropriate understanding and explanation of the critical transformations in the landscape as well as in social institutions, should be sought through analysis of the complex ways in which patterns of action of multiple spatial and temporal rhythms and between multiple agents in an environment, intersect and resonate.
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The politics of planning in Eastern Cape local government: a case study of Ngqushwa and Buffalo City, 1998-2004
- Authors: Hollands, Glenn Delroy
- Date: 2007
- Subjects: Buffalo City (South Africa) Local government -- South Africa -- Eastern Cape -- Case studies Municipal government -- South Africa -- Eastern Cape -- Case studies Political planning -- South Africa -- Eastern Cape Eastern Cape (South Africa) -- History -- 20th century Eastern Cape (South Africa) -- History -- 21st century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2875 , http://hdl.handle.net/10962/d1008199
- Description: This thesis examines the political implications of the integrated development planning process embarked upon by South African municipalities in the period 1998-2004. Through the use of case study methodology that focuses on the Eastern Cape municipalities of Buffalo City and Ngqushwa, the conventions of municipal planning are examined. This inquiry into municipal planning draws upon official government documents and reports and publications from the nongovernment sector. The thesis is particularly focused on the claims made in policy documents and related secondary sources and compares these to more critical reports and publication as well as the author's personal experience of the integrated development planning process. Of key interest is the possibility that planning serves political interests and the material needs of an emerging municipal elite and that this is seldom acknowledged in official planning documentation or government sanctioned publications on the topic. The primary findings of the thesis are as follows: • That the 'reason' of expert policy formulations that accompanied integrated development planning has weakened political economy as a prism of understanding and separated itself from the institutional reality of municipal government • That the dominant critique of planning and other post-apartheid municipal policy is concerned with the triumph of neoliberalism but this critique, while valid, does not fully explain successive policy failures especially in the setting of Eastern Cape local government • That function of policy and its relationship to both the state and civil society is usually understood only in the most obvious sense and not as an instrument for wielding political power • That planning still derives much of its influence from its claim to technical rationality and that this underpinned the 'authority' of the integrated development planning project in South Africa and reinforced its power to make communities governable.
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The principal's leadership role in a successful rural school in Namibia
- Authors: Kawana, Joseph Jost
- Date: 2007
- Subjects: Rural schools -- Namibia School principals -- Namibia Educational leadership -- Namibia School management and organization -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1713 , http://hdl.handle.net/10962/d1003596
- Description: Rural schools generally find it hard to function effectively for a variety of reasons, and managing and leading these schools brings additional challenges. This study explored the role of the principal in an academically successful rural school in Namibia. It drew on leadership theory and findings from related studies to make sense of this particular case of leadership against the odds. Using the interpretive orientation, the research explored selected organisation members’ perceptions of the principal’s leadership through semi-structured interviews. The study found that the actions and attitudes of the leader had a significant influence on the school’s performance. The manner in which the principal conducted himself, the shared vision he encouraged and his insistence on associating with all stakeholders involved in education, were instrumental in the organization’s positive achievements. The principal was shown as committed and a leader with good interpersonal working relationships. The study also revealed that this principal was both a person- and taskoriented leader, and closely resembled the ideals of transformational leadership. This study further found that, through the principal’s instructional leadership, teaching and learning are seen as the core of the school’s activities. Finally, the principal’s leadership role opens the school to the community and results in strong and mutually beneficial relationships between the school and its community.
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The relationship between individual needs and the choice of incentive schemes in the South African Breweries
- Authors: Long, Allan
- Date: 2007
- Subjects: South African Breweries Ltd. Incentives in industry -- South Africa Workers' compensation -- South Africa Performance -- Management Employee motivation
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:800 , http://hdl.handle.net/10962/d1006119
- Description: After careful review of all the relevant literature pertaining to motivation, performance management and compensation in the form of incentives, this thesis focuses primarily on determining whether a statistically significant relationship exists between individual needs and the choice of an incentive scheme option. The secondary aims of the research are to determine whether: A relationship exists between the job grade of an individual and the choice of an incentive scheme. A particular incentive scheme option is preferred by the employees in The South African Breweries (SAB). A particular preference exists, and if so, to make recommendations to SAB for consideration as alternatives to their existing incentive scheme options. After collation of the survey data from the respondents in the sample, the analysis and discussion of the results determined that no significant relationship exists between individual needs and the choice of an incentive scheme option. It was, however, determined that a significant relationship exists between the grade of the employees in SAB and their choice of an incentive scheme. 81% of all respondents indicated a desire for shares as an option in their Short Term Incentives (STI) which indicates a desire for shares in some form or another and may well indicate a level of confidence and commitment by the employees to the organisation. Although the research hypothesis was not proven, significant insights into remuneration within SAB was obtained, which has resulted in recommendations being made for further research into the option of shares in some form or another in the organisation. A further recommendation for SAB is to consider some form of share options for all employees in the organisation. As many other organisations that are performing at remarkable levels attest this performance to share ownership and the behaviour that emanates from it, it would be in the interests of SAB to further investigate the issue as it may improve performance, ownership and retention within the company.
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The relationship between leadership style and employee commitment: an exploratory study in an electricity utility of South Africa
- Authors: Nyengane, Mongezi Hutton
- Date: 2007
- Subjects: Eskom (Firm) -- Management Leadership -- South Africa -- Eastern Cape Management -- Employee participation -- South Africa -- Eastern Cape Organizational behavior -- South Africa -- Eastern Cape Employee motivation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:759 , http://hdl.handle.net/10962/d1003880
- Description: This research investigates the relationship between leadership styles and different types of organisational commitment in Eskom Eastern Region. The literature provided discusses the leadership and organisational commitment. Information was gathered, using two instruments, from a sample of 86 leaders and 334 raters. The Multifactor Leadership Questionnaire, which was formulated from Bass and Avolio’s (1997) Full Range Leadership Development Theory, was used to determine leadership style within the organisation. Employee commitment was captured using Bagraim’s (2004) Organisational Commitment, a South African adaptation of Meyer and Allen’s (1997) Three-Component Model of employee commitment. Leadership was identified as the independent variable and organisational commitment as the dependent variable. Data obtained from each of the research instruments was then statistically analysed. Two-tailed correlation analysis showed that although the relationship is not strong, there is a positive relationship between the transformational leadership behaviours and commitment (affective commitment, continuance commitment and normative commitment). The correlation analysis also indicates a weak, but significant, positive relationship between transactional leadership behaviours and continuance commitment. However, no statistically significant correlation was found between transactional leadership behaviours and affective commitment as well as between transactional leadership behaviours and normative commitment. The correlation results showed a weak, but significant, negative correlation between laissez-faire leadership behaviours and affective commitment. There was no statistically significant correlation between laissez-faire leadership behaviours and continuance commitment as well as between laissez-faire leadership behaviours and normative commitment. Overall findings from this study suggest that transformational and transactional leadership behaviours do play important roles in determining levels of affective commitment, continuance commitment and normative commitment. These findings also reveal that the laissez-faire leadership behaviour had a negative relationship with affective commitment. This research therefore adds a new dimension to the body of literature that will help researchers’ efforts to understand the relationship between leadership style and organisational commitment. As this research takes place in the South African context, it contributes to the bank of findings relating to the development of organisational commitment.
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The representation of South African women politicians in the Sunday Times during the 2004 presidential and general elections
- Authors: Katembo, Tina Kabunda
- Date: 2007
- Subjects: Sunday Times (Johannesburg, South Africa) Women politicians -- South Africa Women in mass media Mass media -- Political aspects -- South Africa Elections -- South Africa South Africa -- Politics and government -- 1994-
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3445 , http://hdl.handle.net/10962/d1002899
- Description: This study analysed the representation of South African women politicians in the Sunday Times’ election news during the 2004 Presidential and general elections, by drawing on perspectives from cultural studies, the constructionist approach to representation and the sociology of news production. Using content analysis and critical discourse analysis, the study found that very few women politicians were used as news actors/sources in the Sunday Times, and that when women politicians were figured, the paper tended to present them in ways that serve to sustain women’s subordinate status in society. Using content analysis, the study analysed 106 news items published between January 1, 2004 and April 30, 2004, and found that of all the 588 identifiable news actors/sources counted, 135 were women and 453 were men. Of these, only 7.67% (or 26) were women politicians and 92.33% (or 313) were men politicians. On average however, the amount of words allocated to a woman politician was more than that allocated to a man politician. The discourse analysis also revealed how the Sunday Times managed to reproduce textually the hegemonic power relations between women and men, by constructing different subject positions for women politicians and men politicians, which generally tended to be negative and positive respectively. In the representation of women politicians, the study revealed patterns that tended to ascribe them negative personality traits, accentuate their passivity and dependency on men, and construct them as incompetent political leaders. This study’s conclusions pose a challenge to the role of the national newspaper in the transformation of gender relations and the promotion of equal access to political and decision-making positions, and to the news media. News discourse, as a social practice, both determines and is determined by the social structure in which it is produced. By systematically reproducing subordinate subject positions for women in the news, the Sunday Times helps to further women’s subordinate status in society. Particularly, as part of the broader social cultural context that is embedded in patriarchal and gender ideologies, the Sunday Times does not merely reflect but actively and effectively constructs the reality it claims to be representing.
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The resurgence of tuberculosis in South Africa: an investigation into socio-economic aspects of the disease in a context of structural violence in Grahamstown, Eastern Cape
- Authors: Erstad, Ida
- Date: 2007
- Subjects: Tuberculosis -- South Africa -- Grahamstown Tuberculosis -- Patients -- South Africa -- Grahamstown Tuberculosis -- Treatment -- South Africa -- Grahamstown Community health services -- South Africa -- Grahamstown Medical anthropology -- South Africa -- Grahamstown Tuberculosis -- Economic aspects -- South Africa -- Grahamstown Tuberculosis -- Social aspects -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2090 , http://hdl.handle.net/10962/d1002653
- Description: This thesis is an investigation into the socio-economic constraints that influence the decisions of tuberculosis sufferers in the health seeking process and therapeutic management of tuberculosis in Grahamstown, the Eastern Cape. It is shown that structural violence influences experiences and perceptions of tuberculosis at all levels. Management of tuberculosis in the formal health sector is explored at local levels and related to national and global strategies of health care. The role of health workers, and particularly voluntary health workers, is explored and it is shown that they work within a context of growing burden of sickness and co-infections and a lack of government commitment to deal with increasing TB and HIV incidences. Kleinman’s notion of explanatory models is explored and it is evident that although knowledge of the aetiology of tuberculosis is well-known to patients and general members of the communities, they are nevertheless victims of increased stigmatisation and marginalisation as a result of illness. The importance of social support in curing tuberculosis is explored using Janzen’s concept of therapy managing groups. Social capital is a fundamental component in adhering to biomedical therapy, but is commonly weak among the structurally poor. The availability of temporary social grants for people living with TB influences health seeking behaviour. In a context of structural poverty the sick are faced with what Nattrass terms “perverse incentives”, having to choose between the right to health and the right to social security, both guaranteed in the South African Constitution, for him/herself and dependants. Although adherence to biomedical therapy is essential in curing tuberculosis, it is shown throughout this thesis that ignoring wider structural causes of disease limits the patient’s ability to get well. The ethnography shows that the right to health is a social and economic right which is not the reality for most South Africans.
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The Rhodes BioSURE process and the use of sustainability indicators in the development of biological mine water treatment
- Authors: Neba, Alphonsus
- Date: 2007
- Subjects: Acid mine drainage Water -- Purification -- Biological treatment Mine water Mine water -- Purification Sewage -- Purification
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3984 , http://hdl.handle.net/10962/d1004043
- Description: Polluted waters, arising from extensive past and ongoing mining operations in South Africa, pose serious environmental threats to the limited fresh water resource. The long time periods, of decades to centuries, over which decanting mine waters may be expected to flow raises additional concerns about the sustainability of these resources. Responses to the problem have thus increasingly been directed towards the long-term sustainability of mine water treatment technologies (MWTT) as a critical indicator in both their research and development, and application. Bioprocess treatments have been considered in this regard and, among these, the Rhodes BioSURE Process has been investigated in preliminary studies using complex organic carbon wastes as the carbon source and electron donor for the central sulphate reduction unit operation. Although both the mining industry and the related statutory/regulatory authority in South Africa share public commitment to sustainability in the treatment of mine waters, no systematic mechanism has emerged to enable the application of sustainability thinking as a guiding principle in the selection and application of MWTTs, nor in the research and development undertaking. This study undertook the development of a Sustainability Indicator Framework in order to provide a systematic basis for the incorporation of sustainability objectives in MWTT bioprocess development, and specifically to use this framework as an input to the investigation of the scaleup development of the Rhodes BioSURE Process. In the development of the MWTT Sustainability Indicator Framework, an initial survey of industry thinking in this area was undertaken and, based on these outcomes, a detailed questionnaire methodology was developed in order to identify and quantify critical sustainability indicators. These included analysis of environmental, economic, social and technical indicators used in sustainability accounting practice in the industry. Statutory/regulatory sustainability targets in the same categories were derived from State of the Environment Reports (SoER) from Provincial authorities where mining is undertaken in South Africa. A synthesis of industry and SoER values was derived from weighted averages and the Sustainability Indicator Framework based on these outcomes. A Conceptual Decision-Support System, to guide the selection and development of MWTTs, was proposed and also based on these results. In the development of the Rhodes BioSURE Process the use of primary sludge (PS) had been investigated as a potential complex carbon and electron donor source. In this regard the utility operator, and sewage treatment process infrastructure, was identified as potentially meeting aspects of the sustainability objectives identified for MWTT application development. Both the Sustainability Indicator Framework and the Conceptual Decision-Support System provided inputs in the formulation of the experimental programme relating to the scale-up development of the Rhodes BioSURE Process. Based on these outcomes, a series of single- and multi-stage reactor configuration, optimisation and enzymology studies were undertaken at bench-, pilot- and technical-scale operations. These units were operated at hydraulic retention times (HRT) ranging between 22 to 72 hours and at chemical oxygen demand to sulphate ratios (COD:SO[subscript 4]) ranging between 1:1 to 2:1. Studies undertaken in fed-batch, bench-scale reactors confirmed the preliminary feasibility of using established sewage treatment infrastructure as a replacement for novel reactor configurations that had been used in the initial studies. The results further indicated that the hydrolysis of PS occurred at different rates under biosulphidogenic conditions in the different reactor configurations investigated. Scale-up of these findings in multi-stage pilot- (7.4m[superscript 3]) and technical-scale plants (680m[superscript 3]) showed comparable performances between the unit operations in terms of SO[subscript 4] and COD removal. These results indicated no apparent advantages in the uncoupling of hydrolysis and sulphate reduction in separate unit operations as had been suggested in previous studies. Scale-down/scale-up studies were undertaken in a continuously fed single-stage reactor configuration and showed that the process could be effectively operated in this way. Previous proposals that chemical and biological gradients established in the sludge bed of the Recycling Sludge Bed Reactor (RSBR) exercised an influence on the rates of substrate hydrolysis were investigated and the relative activity of α- and β-glucosidase and protease enzymes was measured. Results provided additional support for this hypothesis and it was shown that enzyme assay may also provide a useful tool in process development and monitoring studies. While sulphide recovery, following the sulphate reduction step in the BioSURE Process, was not investigated as a component of this study, the treatment of final effluent or waste spills was identified as an important sustainability requirement given the toxicity of sulphide to human and ecosystem environments. A conventional trickle filter reactor system was evaluated for this purpose and showed close to 100% oxidation to sulphate in a short contact time operating regime. Although residual COD removal was low at ~20% of influent, it is considered that high rate recycle biofilter operation could achieve the COD discharge standard of 75 mg/l. The results of the above studies provided inputs into the design, construction and commissioning of the first full-scale commercial application of the Rhodes BioSURE Process for mine wastewater treatment using sewage sludge as the carbon and electron donor source. An adjacent mine and sewage works have been linked by pipeline and an operational capacity of 10 Ml/day water treated has been established with sulphate reduced from ~1300mg/l to <200mg/l. These developments constitute a novel contribution in the mine waste water treatment field.
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The role and efficacy of management in influencing the implementation of an occupational health and safety policy : a case study of DaimlerChrysler South Africa East London
- Authors: Pringle, Jessica Samantha
- Date: 2007 , 2013-07-04
- Subjects: DaimlerChrysler , Automobile industry and trade -- South Africa -- East London -- Case studies , Industrial safety -- Law and legislation -- South Africa , Industrial hygiene -- Law and legislation -- South Africa , Industrial safety -- Management -- South Africa , Industrial hygiene -- Management -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3355 , http://hdl.handle.net/10962/d1007589 , DaimlerChrysler , Automobile industry and trade -- South Africa -- East London -- Case studies , Industrial safety -- Law and legislation -- South Africa , Industrial hygiene -- Law and legislation -- South Africa , Industrial safety -- Management -- South Africa , Industrial hygiene -- Management -- South Africa
- Description: The existence of an occupational health and safety policy is believed to be evidence of management accepting their occupational health and safety role in terms of the Occupational Health and Safety Act. It is accepted that this results in management ensuring the provision of a safe workplace. Despite the emphasis in legislation (the Occupational Health and Safety Act) on the need for management to implement comprehensive occupational health and safety policies, there is a lack of research on the implementation and efficacy of occupational health and safety policies in the workplace. This study investigates the efficacy with which management carries out their occupational health and safety duties and responsibilities when implementing the provisions of an occupational health and safety policy in the workplace. A number of factors are essential to the efficient performance of management in this regard. These factors include managerial commitment, practices and strategies; communication practices and structures; training initiatives and information; the extent of employee and trade union involvement; and the infrastructure of the organisation. This research study is primarily qualitative in nature. Semi-structured interviews were the primary tool used by the researcher to collect the data. The case-study research method was employed to assist the researcher in collecting the data. The participants involved in the research were selected using the principles of strategic informant sampling and expert choice sampling. The participants consisted of a sample of management, employees and shop stewards. The research findings indicate that firstly, the presence of occupational health and safety policies, practices, strategies and systems in the workplace do not automatically result in reduced hazards, accidents or deaths in the workplace. Secondly, the participation schemes and the communication practices put in place by management are weak. The reason for their weakness is their ineffective implementation by management and use by employees and the trade union. Thirdly, management has a definite impact on the involvement, attitudes and actions of the employees and the trade union in occupational health and safety issues. Fourthly, there is an unequal partnership between management and employees as a result of the educational differences regarding occupational health and safety between them. The outcome is that management and employees are faced with numerous challenges in relation to occupational health and safety. Contributing to this challenge is a lack of sufficient resources allocated to training, resulting ultimately in the ineffective monitoring of occupational health and safety in the workplace. The existence of occupational health and safety structures and systems does not provide the essential evidence to suggest that their mere presence makes a difference to the workplace safety level. However, through more co-operation and participation by all the parties, these structures and systems have the potential to be effective. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
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The role of aardvarks (Orycteropus afer) as ecosystem engineers in arid and semi-arid landscapes of South Africa
- Authors: Whittington-Jones, Gareth Morgan
- Date: 2007
- Subjects: Aardvark , Aardvark -- South Africa , Aardvark -- South Africa -- Habitations , Animal burrowing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5757 , http://hdl.handle.net/10962/d1005445 , Aardvark , Aardvark -- South Africa , Aardvark -- South Africa -- Habitations , Animal burrowing
- Description: Arid and semi arid environments are characterised by extreme fluctuations in temperature and low rainfall which present significant challenges to the animals inhabiting these areas. Mammals, such as aardvarks (Orycteropus afer, Pallas 1766), excavate burrows in order to avoid predators and climatic extremes and are termed “ecosystem engineers” as they physically modify their environment and in doing so create new habitats and alter the availability of resources to other species. In this study I assessed the microhabitat conditions (maximum and minimum temperature, relative humidity and seed abundance) of aardvark burrows in relation to paired control sites. In addition, I evaluated the use of aardvark burrows by other vertebrate and invertebrate species and investigated the impact of aardvark burrow mounds on landscape scale floristic diversity. Maximum temperatures were significantly lower (p < 0.05) and minimum temperatures and midday humidity were significantly higher (p < 0.05) inside the burrows at the three study sites, Kwandwe Private Game Reserve (Kwandwe), Mountain Zebra National Park (MZNP) and Tswalu Kalahari Reserve (Tswalu). There were no significant differences between the concentration of seeds, the average numbers of unique individual small mammals, trap success or small mammal species richness recorded inside the burrows compared to outside (p > 0.05). At all three sites, small mammal species diversity was higher in the burrows but this result was also not significant (p > 0.05 for all). Trap success and the number of individuals captured was higher at Tswalu than the other two sites (p < 0.05 for both). The different methods used in this study revealed a total of 25 mammal, seven bird, one amphibian and six reptile species utilising aardvark burrows. There were significant differences in insect community assemblages between the burrows and open control areas at Kwandwe and Tswalu (p < 0.05 for both) but not at MZNP (p > 0.05). The parasitic guild was more prominent inside the burrows than outside but their abundance was not as high as anticipated, possibly due to the placement of traps closer to the burrow entrances than the sleeping chambers. The complex structure of the burrows prevented the placement of traps in close proximity to the sleeping chambers. As expected, the amount of bare earth was significantly higher on active and recently abandoned burrow mounds compared to the old burrow mounds and reference plots at all three sites (p < 0.05 for all), with the exception of the active burrows at Tswalu. Overall, the different plot types were characterised by significantly different plant communities during all the seasons at MZNP, during three of the seasons at Kwandwe and only during winter at Tswalu. The total species richness recorded on the reference plots was higher than on the burrow mounds at all three sites. However, species diversity on the reference plots was not significantly higher than the burrows at any of the sites (p > 0.05 for all sites). Although the results were not significant, the overall species diversity at a site level was greater than the reference patches at Kwandwe and Tswalu (p > 0.05 for both). Aardvarks fulfil the criteria of a significant ecosystem engineer and their presence in arid and semi-arid environments is likely to be critical to the survival of other individual organisms and species, particularly when alternative burrowing animals are either absent or restricted in their activities. Thus, aardvark populations should be considered a conservation priority in arid and semi-arid ecosystems.
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The role of achievement motivation on the interlanguage fossilization of middle-aged English-as-a-second-language learners
- Authors: Vujisic, Zoran
- Date: 2007
- Subjects: Second language acquisition Language and languages -- Study and teaching Fossilization (Linguistics) Interlanguage (Language learning) English language -- Study and teaching -- Foreign speakers Motivation in education
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2368 , http://hdl.handle.net/10962/d1003748
- Description: Second language acquisition (SLA) is seldom entirely successful with adult learners. It has been suggested that all second language (L2) learners, in the process of mastering a target language (TL), develop a linguistic system that is self-contained and different from both the learner's native language and the TL. This system is referred to as 'interlanguage' (lL). In the process of SLA, IL evolves into an ever-closer approximation of the TL, and ideally, a learner's IL should continue to advance until it becomes equivalent to the TL. However, it has been observed that somewhere in the L2 learning process, IL may reach one or more plateaus during which the development of the IL is delayed or arrested. A permanent cessation of progress toward the TL is referred to as 'fossilization'. Researchers in SLA agree that motivation is one of the key factors influencing language-learning success and studies suggest that some language learning motivation may be related to the need for achievement. The purpose of this research was to establish if adult ESL learners are aware of fossilization and, to examine if motivation, and more specifically achievement motivation, is a factor in IL fossilization. The participants in this study consisted of 15 ESL learners in Puerto Rico who had at least eight years of formal ESL training. The instrument used to gather information included a questionnaire to obtain demographical and qualifying data, an 'English Language Proficiency Evaluation' to determine levels of IL fossilization, a 'Measure of Achievement Motivation' to ascertain achievement motive, and individual and group interviews in order to ascertain perception(s) regarding the role of motivation on fossilization and perceptions regarding the barriers to achieving TL competency. The research demonstrated that there is a moderate to strong positive relationship between IL fossilization and achievement motivation, i.e., high achievement motive is correlated to TL competency and descending levels of achievement motive are correlated to ascending levels of IL fossilization. The findings have significant implications for both ESL learning and instruction, and suggest that not all IL fossilization may be permanent.
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The role of ants in structuring insect communities on the canopies of senegalia drepanolobium near Laikipia, Kenya
- Authors: Kuria, Simon Kamande
- Date: 2007
- Subjects: Ants -- Kenya Ants -- Behavior Insect societies -- Kenya Forest canopy ecology -- Kenya
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5758 , http://hdl.handle.net/10962/d1005446
- Description: In the black cotton ecosystem of Laikipia, Kenya, four symbiotic ants coexist at a fine spatial scale on canopies of Senegalia drepanolobium. They exhibit different aggressive behaviours and modify their tree canopies differently. These diverse behaviours were expected to affect the associated canopy arthropod communities. At the Kenya long-term exclosure experiment (KLEE) and its immediate environs at Mpala Research Centre, Laikipia, the insect communities coexisting with each of the four ant species were characterized, and their response to different vertebrate herbivory. Other ant species inhabiting the tree canopies or the ground were surveyed too. Pitfall trapping was used in sampling terrestrial ants, while beating and mist-blowing were used in collecting arboreal insects. Different sampling methods had varying efficacies, revealing the importance of using several methods. There are at least sixteen ant species in this ecosystem, all occurring on the ground, but only ten species on the trees. Terrestrial ant communities in this ecosystem cannot be used as indicators of grazing pressure for range management. A total of 10,145 individual insects were collected from the tree canopies, comprising of 117 species from seven orders and 25 families, forming a complex community of species interacting at different levels. Symbiotic ant species had a significant effect on insect community structure and composition. Crematogaster sjostedti was associated with a community that was significantly different from the other ant species. There was no significant effect of vertebrate feeding pressure on the canopy insect community, but there was an interaction effect between ant species and treatments. Significant differences between ant species mostly occurred on treatment plots where only cows were allowed to graze. One or more of the ant species may be a keystone species in this ecosystem even though experimental manipulations failed to confirm earlier findings. It was concluded that the one-year period during which experimental manipulations were carried out was not long enough to reflect takeover effects on the insect community. The four symbiotic ant species colonizing S. drepanolobium comprises of two guilds, the hemipteran-tending ants (C. sjostedti and Crematogaster mimosae) and non-tending ants (Crematogaster nigriceps and Tetraponera penzigi). Communities associated with these guilds were found to be significantly different in all four diversity indices. The black cotton ecosystem is species-poor compared to other ecosystem such as forests. The number of insect species that colonizes S. drepanolobium and coexists with acacia-ants forms a large proportion of the invertebrate community. Therefore, this ecosystem should be conserved to safeguard this invertebrate community. This will also give scientists a chance to establish how the various insect species coexist with symbiotic ants on tree canopies.
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The role of arbuscular mycorrhizal fungi in the biotransformation of coal and application in dump rehabilitation
- Authors: Mukasa-Mugerwa, Thomas Tendo
- Date: 2007
- Subjects: Vesicular-arbuscular mycorrhizas , Mycorrhizal fungi , Fungi -- Biotechnology , Bermuda grass , Coal mines and mining -- Environmental aspects , Acid mine drainage
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3999 , http://hdl.handle.net/10962/d1004059 , Vesicular-arbuscular mycorrhizas , Mycorrhizal fungi , Fungi -- Biotechnology , Bermuda grass , Coal mines and mining -- Environmental aspects , Acid mine drainage
- Description: Fundamental processes underpinning the biotransformation of coal by fungal biocatalysts have been intensively investigated, however, limited large-scale industrial applications using such systems have been reported. The un-anticipated sporadic growth of Cynodon dactylon on the surface of un-rehabilitated discard coal dumps has been noted and this was found to be coupled with the breakdown of coal into a humic soil-like material in the top 1.5 metres of the dumps. Extensive fungal growth was observed to be associated with the Cynodon dactylon root system and examination of plant roots indicated the presence of mycorrhizal fungi. Analysis of the Cynodon dactylon plant roots around which coal biotransformation was occurring confirmed the presence of arbuscular mycorrhizal colonisation with the species Glomus clarum, Paraglomus occultum, Gigaspora gigantea and Glomus mosseae identified to be associated with the plants. Further molecular characterisation of non-mycorrhizal rhizospheric fungi showed the presence of fungal species with coal-degrading capabilities that most likely played a role in the coal biotransformation observed. The discard coal dump environment was simulated in pot and column studies and coal biotransformation was reproduced, with this process enhanced by the addition of mycorrhizal and non-mycorrhizal rhizospheric fungal inocula to the environment. Mycorrhizal and non-mycorrhizal species in the inoculum were re-isolated from the simulated environment fulfilling a number of Koch’s postulates and indicating a causal role in the biotransformation of coal. An inversion of conventional mycorrhizal colonisation was demonstrated in this system with reduction in extraradicular presence and an increase in intracellular colonisation compared to soil controls. A descriptive model was formulated suggesting a two-part fungal system involving organic carbon and nutrient exchange between the plant, mycorrhizal fungi and non-mycorrhizal coal-degrading rhizospheric fungi ultimately resulting in the biotransformation of coal. The biotransformation observed was comparable to reports of “rock-eating fungi”. Results suggest that the biological degradation of coal in situ with the production of a soil-like substrate could provide a feasible method of discard coal dump rehabilitation as well as provide a humic-rich substrate that can be utilised in further industrial applications.
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The role of school-based studies in developing reflective practice at a Namibian College of Education
- Authors: Kapalu, Henry
- Date: 2007
- Subjects: Teachers -- Training of -- Namibia Educational change -- Namibia Curriculum planning -- Namibia Education, Higher -- Namibia Universities and colleges -- Namibia -- Curricula
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1751 , http://hdl.handle.net/10962/d1003635
- Description: This investigation looks at the role played by school-based studies in the development of reflective practice among student teachers at a Namibian college of education. Literature reviewed indicates that reflective practice helps teachers continually grow and enhance their professional insights and practices. The study focused on the perceptions and experiences of a group of teacher educators, support teachers and student teachers involved in a particular teacher education programme. A case study was chosen, and built up using an interpretive paradigm. This enabled the researcher to make meaning of information often taken for granted. Triangulation was used to ensure the development of as broad and authentic a picture of the case as possible. Key findings reveal that despite claims that Namibia’s three-year Basic Education Teacher Diploma programme (BETD) is explicitly designed to facilitate the development of critical reflective and reflexive practice in student teachers, the way in which aspects of the programme are implemented frequently undermines this design intention. A lack of careful and explicit mentoring on the importance of reflection for enhancing teaching, plus a measure of distrust between student teachers and teacher educators prevents college students from fully exploiting the opportunities afforded by school-based studies for the development of reflective skills.
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The role of the euthecosome pteropod, limacina retroversa, in the polar frontal zone, Southern Ocean
- Authors: Bernard, Kim Sarah
- Date: 2007
- Subjects: Pteropoda Limacidae Zooplankton -- Antarctic Ocean Copepoda Phytoplankton
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5761 , http://hdl.handle.net/10962/d1005449
- Description: The aim of the present study was to assess the ecological role of the euthecosome pteropod, Limacina retroversa, in particular, and the mesozooplankton community, in general, in the pelagic ecosystem of the Polar Frontal Zone (PFZ), Southern Ocean. Data were collected from four oceanographic surveys to the Indian sector of the PFZ during austral autumn 2000, 2002, 2004 and 2005. Copepods, mainly Calanus simillimus, Oithona similis, Clausocalanus spp. and Ctenocalanus spp., typically dominated total mesozooplankton counts, accounting for, on average, between 75.5 % and 88.1 % (Mean = 77.4 %; SD = 13.4 %) of the total, during the present investigation. Results of the study indicate that L. retroversa may, at times, contribute substantially to total mesozooplankton abundances. During the study, L. retroversa contributed between 0.0 and 30.0 % (Mean = 5.3 %; SD = 7.1 %) to total mesozooplankton numbers. Significant small-scale variability in abundance and size structure of L. retroversa and abundance of copepods was minimal. Inter-annual variability, on the other hand, was significant between some years. Total pteropod numbers were greatest during April 2002 and 2004, while copepods exhibited greatest abundances during April 2004 only. Pearson’s Correlation analysis suggested that L. retroversa abundances were positively correlated to total surface chlorophyll-a (chl-a) concentrations. The significantly lower chl-a concentrations recorded during April 2005 may explain the reduced pteropod numbers observed during that survey. The size class structure of L. retroversa comprised mainly small and mediumsized individuals during all four surveys. This corresponds well with records from the northern hemisphere (sub-Arctic and Arctic waters) where Limacina spp. are reported to exhibit maximum spawning during mid to late-summer. Higher abundances of large individuals only occurred during April 2005, when chl-a concentrations were very low; possibly the result of delayed spawning, due to reduced food availability. Ingestion rates of the four most abundant copepods, determined using the gut fluorescence technique, ranged between 159.32 ng (pigm) ind⁻¹ day⁻¹ and 728.36 ng (pigm) ind⁻¹ day⁻¹ (Mean = 321.01 ng (pigm) ind⁻¹ day⁻¹; SD = 173.91 ng (pigm) ind⁻¹ day). Ingestion rates of L. retroversa were much higher, ranging from an average of 4 28.68 ng (pigm) ind⁻¹ day⁻¹ in April 2002 to 4 196.88 ng (pigm) ind⁻¹day⁻¹in April 2005 (Mean = 4157.36 ng (pigm) ind⁻¹ day⁻¹; SD = 35.37 ng (pigm) ind⁻¹day⁻¹). Average daily grazing rates for the pteropod varied between 0.39 mg (pigm) m⁻² day⁻¹ in April 2005 and 17.69 mg (pigm) m-2 day-1 in April 2004 (Mean = 6.13 mg (pigm) m⁻² day⁻¹; SD = 11.04 mg (pigm) m⁻² day⁻¹); corresponding average daily grazing impacts ranged between 8.4 % and 139.8 % of the phytoplankton standing stock in April 2005 and 2004, respectively (Mean = 48.5 %; SD = 84.5 %). Average daily grazing rates of the four copepods ranged from 4.58 mg (pigm) m⁻² day⁻¹ to 8.77 mg (pigm) m⁻² day⁻¹ -1, during April 2002 and 2004, respectively (Mean = 6.28 mg (pigm) m⁻² day⁻¹; SD = 5.94 mg (pigm) m⁻² day⁻¹). Collectively, the copepods removed an average of between 31.6 % and 89.8 % of the phytoplankton standing stock per day, during April 2002 and 2004, respectively (Mean = 70.8 %; SD = 86.7 %). The daily grazing impact of the copepods accounted for an average of between 40.4 % and 87.8 % of the total zooplankton grazing impact, during April 2004 and 2005, respectively (Mean = 75.0 %; SD = 65.5 %). L. retroversa was responsible for an average of 52.4 % and 59.5 % of the total zooplankton grazing impact, during April 2002 and 2004, respectively. However, during April 2005, when L. retroversa numbers were significantly lower than previous years, the pteropod contributed an average of only 7.5 % to the total zooplankton grazing impact. Thus, during the present investigation,the pteropod was responsible for removing a mean of 48.9 % of the available phytoplankton (SD = 74.9 %). The predation impact of the dominant carnivorous macrozooplankton and micronekton in the PFZ was determined during April 2004 and 2005 using daily ration estimates obtained from the literature. Additionally, gut content analysis was used to determine the contribution of L. retroversa to the diet of the dominant predators. Average predation impact ranged from 1.1 % and 5.7 % of the total mesozooplankton standing stock during April 2004 and 2005, respectively (Mean = 3.8 %; SD = 12.3 %). Chaetognaths and euphausiids dominated total carnivore numbers and made the greatest contributions to total predation impact during both years. Copepods appeared to be the main prey item of the dominant carnivorous macrozooplankton-micronekton in the region. L. retroversa was only detected in the gut contents of the amphipod, Themisto gaudichaudi, but not in either of the chaetognath species (Eukrohnia hamata and Sagitta gazellae) or the myctophid fish (Electrona spp.). The pteropod was found in 19 % of amphipod guts dissected. Pearson’s Correlation analyses showed that the four major predatory zooplankton groups found in the PFZ (chaetognaths, euphausiids, amphipods and myctophid fish) were positively correlated to abundances of L. retroversa, suggesting that the pteropod might be an important prey item for many of the carnivorous macrozooplankton/micronekton in the PFZ. To conclude, L. retroversa may play an important role in the pelagic ecosystem of the PFZ, in austral autumn. However, ocean acidification and calcium carbonate undersaturation (as a result of increased anthropogenic carbon dioxide emissions), that is predicted to occur within the next 50 – 100 years, will most likely have significant implications for the Sub-Antarctic pelagic ecosystem if L. retroversa cannot adapt quickly enough to the changes.
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The significance of participation in capacity development and project sustainability: a case study of the Zimbabwe Secondary Teacher Training Environmental Education Project (St²eep)
- Authors: Van Ongevalle, Jan
- Date: 2007
- Subjects: High school teachers -- Training of -- Zimbabwe Environmental education -- Study and teaching (secondary) -- Zimbabwe Environmental education -- Curricula -- Case studies -- Zimbabwe Environmental education -- Curricula -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1766 , http://hdl.handle.net/10962/d1003651
- Description: This study uses a systems thinking perspective to explore the role and meaning of participation, capacity development and project sustainability in the Zimbabwe Secondary Teacher Training Environmental Education Project (St²eep). Since there was no consistent critical reflection upon the different assumptions that underpin these important aspects of St²eep in the original project design, this study aims to articulate a theoretical framework for guiding the project. St2eep is a donorfunded project, located in the Ministry of Higher and Tertiary Education in Zimbabwe that seeks to integrate environmental education across the curriculum of secondary teacher education. The study first develops a theoretical framework drawing on systems thinking. In particular it uses the holistic and constructivist perspectives embedded in systems thinking to describe a number of analytic frameworks that are used as a guide to investigate participation, capacity development and project sustainability in the St²eep case study. The research methodology comprises a qualitative case study approach, which contains elements of an instrumental, evaluative and critical case study. Data-collection methods include document analysis, focus group discussions, focus group interviews, semi-structured face-to-face interviews and participant observation. Data analysis follows the constant comparative method of coding and categorising data as outlined by Strauss and Corbin (1998). The outcomes of this research show that participation processes in St²eep evolve around the interactions between a political dimension and a learning dimension. The political dimension relates to giving the project stakeholders a critical voice, allowing them to shape the project and involving them in the decision-making process. This approach has fostered an ongoing learning process in a small team of committed stakeholders based on the principles of collaborative learning, team learning and action research. Participation was shown to enhance capacity-development processes at individual and institutional level by the provision of support through learning teams, and by the renegotiation of responsibilities and power relations between lecturers involved in St²eep, donor representatives and college administrations. The strong operational role of the donor organisation was seen as a serious threat towards individual and institutional capacity development since it creates a functional but artificial and independent project system within the college system and takes over any local institutional support structure that it might seek to develop. Fostering continuous learning and capacity development, St²eep’s participatory approach was shown to contribute to a better understanding of the interconnectedness of factors that influence future sustainability of the project and the implementation of environmental education. This has assisted in the development of different scenarios on the sustainability of the project. The research shows that the project-ustainability planning process draws directly from St²eep’s ongoing learning process, with individual and institutional capacity development featuring strongly in the different scenarios, and with the external context such as the economic situation and the low priority of environmental education being recognised as important factors that need to be considered. Drawing on the findings from the case study, this study makes a tentative recommendation that donor organisations should focus more on capacity-development initiatives and avoid taking on a strong operational role in project activities. The research also recommends that there is need for a deliberate focus on both the political and learning dimensions of the participation process in order to foster local ownership. Making the learning aspect much more central in St²eep is presented as a possible strategy for motivating a larger number of college lecturers to become involved in the project and the implementation of environmental education. The study also urges St²eep to combine the different scenarios that have emerged during the project sustainability planning process and to focus on the benefits that stakeholders want to see sustained.
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The significance of the safety-net role of NTFPs in rural livelihoods, South Africa
- Authors: Paumgarten, Fiona
- Date: 2007
- Subjects: Non-timber forest products -- South Africa , Households -- Economic aspects -- South Africa , Rural development -- South Africa -- Economic aspects , Sustainable development -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4763 , http://hdl.handle.net/10962/d1007161 , Non-timber forest products -- South Africa , Households -- Economic aspects -- South Africa , Rural development -- South Africa -- Economic aspects , Sustainable development -- South Africa
- Description: This study was conducted in two rural villages in South Africa with the purpose of investigating the safety-net role of non-timber forest products (NTFPs). The use of NTFPs as a safety-net is reported as a common feature of rural livelihoods however empirical data supporting this function is limited. Therefore, policy makers and land-use planners underappreciate the probable role and consequent value of the safety-net function. The findings show that poor, rural households are vulnerable to a range of risks. Over a two year period 100% of households reported experiencing crises including unexpected idiosyncratic risks (e.g. illness, retrenchment, crop failure and death) as well as expected expenses and periods of vulnerability (e.g. the payment of school fees and seasonal crop shortfalls). Households are prone to these risks irrespective of wealth or gender of the de jure household head. To secure their livelihoods households in both villages rely on a variety of livelihood strategies including waged labour (53%), self-employment (30%), government grants (60%), arable agriculture (56%), animal husbandry (64%) and the use (100%) and sale (22%) of NTFPs. In terms of the proportion of households involved, the findings suggest land-based strategies make an important contribution. Formal employment and old-age pensions distinguish wealthy households from poor and allow for investments in assets and saving schemes (62%). In response to the risks experienced households employed a variety of coping strategies. Generally the most commonly used strategies were kinship (85%), reduced household spending (72%), changes to food consumption and saving (72%) and relying on NTFPs (70%). Kinship and NTFPs show no differences for wealth or gender of the de jure household head. The remaining strategies are influenced by wealth. The use of NTFPs as a safety-net manifested predominantly through the increased use of products, then the substitution of commercial goods by NTFPs and lastly through the sale. Of those using NTFPs as a rural safety-net 41.4% used of wild foods, 40% used medicinal plants, 25.7% substituted paraffin with fuelwood, 10% sold fuelwood and 8.6% sold other products.
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The term structure of interest rates and economic activity in South Africa
- Authors: Shelile, Teboho
- Date: 2007
- Subjects: Finance -- South Africa , Monetary policy -- South Africa , Interest rates -- South Africa , Economic development -- South Africa , South Africa -- Economic conditions -- 21st century
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:994 , http://hdl.handle.net/10962/d1002729 , Finance -- South Africa , Monetary policy -- South Africa , Interest rates -- South Africa , Economic development -- South Africa , South Africa -- Economic conditions -- 21st century
- Description: Many research papers have documented the positive relationship between the slope of the yield curve and future real economic activity in different countries and different time periods. One explanation of this link is based on monetary policy. The forecasting ability of the term spread on economic growth is based on the fact that interest rates reflect the expectations of investors about the future economic situation when deciding about their plans for consumption and investment. This thesis examined the predictive ability of the term structure of interest rates on economic activity, and the effects of different monetary policy regimes on the predictive ability of the term spread. The South African experience offers a unique opportunity to examine this issue, as the country has experienced numerous monetary policy frameworks since the 1970s. The study employed the Generalised Method Moments technique, since it is considered to be more efficient than Ordinary Least Squares. Results presented in this thesis established that the term structure successfully predicted real economic activity during the entire research period with the exception of the last sub-period (2000-2004) when using the multivariate model. In the periods of financial market liberalisation and interest rates deregulation the term structure was found to be a better predictor of economic activity in South Africa. These findings emphasise the importance of considering the prevailing economic environment in testing the term structure theory.
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