Monetary policy, inflation, unemployment and the Phillips curve in South Africa
- Authors: Chicheke, Aaron
- Date: 2009
- Subjects: Monetary policy , Inflation (Finance) , Economic policy -- Mathematical models , Unemployment -- South Africa , Phillips curve
- Language: English
- Type: Thesis , Masters , M Com
- Identifier: vital:11453 , http://hdl.handle.net/10353/d1001202 , Monetary policy , Inflation (Finance) , Economic policy -- Mathematical models , Unemployment -- South Africa , Phillips curve
- Description: Inflation and unemployment are perhaps the two most important challenges that face the South African economy of today. Firstly, the study examines the relationship between monetary policy and the two economic fundamentals (inflation and unemployment), using the VEC modeling technique. The model regresses the monetary policy variable against inflation and unemployment growth over the period 1980-2008. The results suggest that (1) there is a long run relationship between inflation and unemployment (2) monetary policy reacts more to variations in inflation compared to variations in unemployment. Secondly, the relationship between inflation and unemployment as explained by the Phillips curve is investigated. The results show that there is a positive relationship between inflation and unemployment.
- Full Text:
- Date Issued: 2009
- Authors: Chicheke, Aaron
- Date: 2009
- Subjects: Monetary policy , Inflation (Finance) , Economic policy -- Mathematical models , Unemployment -- South Africa , Phillips curve
- Language: English
- Type: Thesis , Masters , M Com
- Identifier: vital:11453 , http://hdl.handle.net/10353/d1001202 , Monetary policy , Inflation (Finance) , Economic policy -- Mathematical models , Unemployment -- South Africa , Phillips curve
- Description: Inflation and unemployment are perhaps the two most important challenges that face the South African economy of today. Firstly, the study examines the relationship between monetary policy and the two economic fundamentals (inflation and unemployment), using the VEC modeling technique. The model regresses the monetary policy variable against inflation and unemployment growth over the period 1980-2008. The results suggest that (1) there is a long run relationship between inflation and unemployment (2) monetary policy reacts more to variations in inflation compared to variations in unemployment. Secondly, the relationship between inflation and unemployment as explained by the Phillips curve is investigated. The results show that there is a positive relationship between inflation and unemployment.
- Full Text:
- Date Issued: 2009
Movement bahaviour of three South African inshore sparid species in rocky intertidal and shallow subtidal habitats
- Authors: Watt-Pringle, Peter Andrew
- Date: 2009
- Subjects: Sparidae -- South Africa , Diplodus , Sparodon Durbanensis , Fisheries -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5302 , http://hdl.handle.net/10962/d1005147 , Sparidae -- South Africa , Diplodus , Sparodon Durbanensis , Fisheries -- South Africa
- Description: This study investigated the movement behaviour of three inshore South African sparids – blacktail (Diplodus sargus capensis), zebra (Diplodus cervinus hottentotus) and white musselcracker (Sparodon durbanensis), popular inshore fishery species caught in appreciable numbers along much of the South African coast. The first study component examined movements of juveniles in a rocky intertidal nursery area at Schoenmakerskop near Port Elizabeth. Juveniles in a single gully were tagged with Visible Implant Elastomer (VIE) and resighted at the study site on snorkelling gear over a seven-month period. Tagged zebra and musselcracker displayed limited movement between potential low tide refuges, being observed repeatedly in the same gully over the full duration of the study. However, blacktail displayed greater movements and were seen infrequently in the later period of the study, probably having undergone an ontogenetic habitat shift to subtidal areas. There was evidence that blacktail maintain use of their intertidal nursery over high tide, during which the other two species moved into shallower areas adjacent to their low tide refuge. The results of three national tagging programs were analysed to determine the movement patterns of adolescent and adult fishes. The coast-wide ORI-WWF National Voluntary Tagging Program and two dedicated research programs in marine protected areas (MPAs) at De Hoop MPA and Tsitsikamma National Park (TNP) recorded few large-scale movements of tagged adult blacktail, zebra and juvenile musselcracker. High spatial-resolution data from the TNP suggested movements were usually on scales far smaller than one km. Together with long periods at liberty for many recaptured individuals, this suggests these fishes are longterm residents of small home range areas. However, tagged musselcracker over 600 mm forklength (adults) were observed to make large-scale movements, including some in excess of 800 km from Eastern Cape to KwaZulu-Natal waters. Predominantly eastward movements of adults recaptured during the spawning season indicate seasonal spawning migrations that occur in different regions of the coast. These enable the use of prevailing oceanographic currents to disperse eggs and larvae to suitable rocky nursery habitat. The third component of this study made use of high-resolution data on the temporal and spatial distribution of catches by scientific angling in the TNP to examine the daily activity patterns of the study species in relation to diel and tidal cycles, and habitat use. Blacktail capture probability was correlated with the diurnal light cycle, with peaks close to twilight suggesting elevated crepuscular foraging activity. Catches of blacktail, zebra and small musselcracker were correlated with the tidal cycle, foraging peaking over high tide periods. All three species used shallow inshore habitats extensively for foraging, blacktail showing a preference for sandy areas, while zebra and small musselcracker preferred shallow reef. Capture probability of larger musselcracker, however, was unrelated to habitat, possibly evidence of increasing area and habitat use with an ontogenetic change in diet. The lifetime movement patterns of these three species are discussed in relation to conservation measures and their management in South African fisheries. Restricted movement throughout post-settlement life for blacktail and zebra, and during the juvenile phase for musselcracker, makes local populations vulnerable to overexploitation. At present, MPAs probably play an important role in protecting local blacktail and zebra populations from overexploitation, and limited post-settlement movements mean the degree of larval dispersal between protected and adjacent areas will likely determine the effectiveness of MPAs in enhancing fisheries for these species. By contrast, MPAs likely provide recruits to fisheries for musselcracker during ontogenetic movements and dispersal from MPAs during spawning migrations. MPAs only offer partial protection to adult musselcracker populations in the spawning season, but this could nevertheless be significant under high levels of exploitation.
- Full Text:
- Date Issued: 2009
- Authors: Watt-Pringle, Peter Andrew
- Date: 2009
- Subjects: Sparidae -- South Africa , Diplodus , Sparodon Durbanensis , Fisheries -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5302 , http://hdl.handle.net/10962/d1005147 , Sparidae -- South Africa , Diplodus , Sparodon Durbanensis , Fisheries -- South Africa
- Description: This study investigated the movement behaviour of three inshore South African sparids – blacktail (Diplodus sargus capensis), zebra (Diplodus cervinus hottentotus) and white musselcracker (Sparodon durbanensis), popular inshore fishery species caught in appreciable numbers along much of the South African coast. The first study component examined movements of juveniles in a rocky intertidal nursery area at Schoenmakerskop near Port Elizabeth. Juveniles in a single gully were tagged with Visible Implant Elastomer (VIE) and resighted at the study site on snorkelling gear over a seven-month period. Tagged zebra and musselcracker displayed limited movement between potential low tide refuges, being observed repeatedly in the same gully over the full duration of the study. However, blacktail displayed greater movements and were seen infrequently in the later period of the study, probably having undergone an ontogenetic habitat shift to subtidal areas. There was evidence that blacktail maintain use of their intertidal nursery over high tide, during which the other two species moved into shallower areas adjacent to their low tide refuge. The results of three national tagging programs were analysed to determine the movement patterns of adolescent and adult fishes. The coast-wide ORI-WWF National Voluntary Tagging Program and two dedicated research programs in marine protected areas (MPAs) at De Hoop MPA and Tsitsikamma National Park (TNP) recorded few large-scale movements of tagged adult blacktail, zebra and juvenile musselcracker. High spatial-resolution data from the TNP suggested movements were usually on scales far smaller than one km. Together with long periods at liberty for many recaptured individuals, this suggests these fishes are longterm residents of small home range areas. However, tagged musselcracker over 600 mm forklength (adults) were observed to make large-scale movements, including some in excess of 800 km from Eastern Cape to KwaZulu-Natal waters. Predominantly eastward movements of adults recaptured during the spawning season indicate seasonal spawning migrations that occur in different regions of the coast. These enable the use of prevailing oceanographic currents to disperse eggs and larvae to suitable rocky nursery habitat. The third component of this study made use of high-resolution data on the temporal and spatial distribution of catches by scientific angling in the TNP to examine the daily activity patterns of the study species in relation to diel and tidal cycles, and habitat use. Blacktail capture probability was correlated with the diurnal light cycle, with peaks close to twilight suggesting elevated crepuscular foraging activity. Catches of blacktail, zebra and small musselcracker were correlated with the tidal cycle, foraging peaking over high tide periods. All three species used shallow inshore habitats extensively for foraging, blacktail showing a preference for sandy areas, while zebra and small musselcracker preferred shallow reef. Capture probability of larger musselcracker, however, was unrelated to habitat, possibly evidence of increasing area and habitat use with an ontogenetic change in diet. The lifetime movement patterns of these three species are discussed in relation to conservation measures and their management in South African fisheries. Restricted movement throughout post-settlement life for blacktail and zebra, and during the juvenile phase for musselcracker, makes local populations vulnerable to overexploitation. At present, MPAs probably play an important role in protecting local blacktail and zebra populations from overexploitation, and limited post-settlement movements mean the degree of larval dispersal between protected and adjacent areas will likely determine the effectiveness of MPAs in enhancing fisheries for these species. By contrast, MPAs likely provide recruits to fisheries for musselcracker during ontogenetic movements and dispersal from MPAs during spawning migrations. MPAs only offer partial protection to adult musselcracker populations in the spawning season, but this could nevertheless be significant under high levels of exploitation.
- Full Text:
- Date Issued: 2009
Music as social discourse : the contribution of popular music to the awareness and prevention of HIV/AIDS in Nairobi, Kenya
- Authors: Gitonga, Priscilla Nyawira
- Date: 2009
- Subjects: AIDS (Disease) -- Songs and music -- Nairobi -- Kenya , AIDS (Disease) -- Social aspects -- Nairobi -- Kenya , AIDS (Disease) -- Prevention , Music therapy
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8510 , http://hdl.handle.net/10948/962 , AIDS (Disease) -- Songs and music -- Nairobi -- Kenya , AIDS (Disease) -- Social aspects -- Nairobi -- Kenya , AIDS (Disease) -- Prevention , Music therapy
- Description: This dissertation is a critical, theoretical study focussing is on the contribution that popular music makes towards raising awareness and promoting the prevention of HIV/Aids in Nairobi, Kenya. Towards this end, an analysis of the lyrics and musical gestures of four Kenyan pop music songs is undertaken in order to highlight their communicative capabilities in this regard. These songs, namely, are Lulumbe by Wasike wa Musungu, Juala by Circute and Jo-el, Vuta Pumz by The Longombas, and Dunia Mbaya Chunguze by Princess Jully. The context in which these musical analyses occur is provided in: - An overview of the Kenya of today, in particular that of the diverse and hybrid ethnic, linguistic, musical and cultural practices of Nairobi, and of the various youth cultures in that city, as well as in an overview of the extent of the HIV/Aids pandemic in Kenya, especially amongst the youth of Nairobi, with some reflection on existing interventions. - An overview of current trends in popular music analysis and an explanation of the author’s own eclectic semiotic analytical methodology within this context. The study concludes that a repeating strategy may be discerned on the part of the composers and performers in question, namely, to first engage audiences through language and music with which they are familiar, and then to encourage audiences to confront the unknown and unfamiliar in music and language, but also ultimately in terms of their social practices. The known and the familiar is highlighted both in the lyrics and in the music itself. It includes use of commonlyspoken languages and dialects, popular musical styles typical of the particular sub-culture, and references to the day-to-day experiences of the ordinary person.
- Full Text:
- Date Issued: 2009
- Authors: Gitonga, Priscilla Nyawira
- Date: 2009
- Subjects: AIDS (Disease) -- Songs and music -- Nairobi -- Kenya , AIDS (Disease) -- Social aspects -- Nairobi -- Kenya , AIDS (Disease) -- Prevention , Music therapy
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8510 , http://hdl.handle.net/10948/962 , AIDS (Disease) -- Songs and music -- Nairobi -- Kenya , AIDS (Disease) -- Social aspects -- Nairobi -- Kenya , AIDS (Disease) -- Prevention , Music therapy
- Description: This dissertation is a critical, theoretical study focussing is on the contribution that popular music makes towards raising awareness and promoting the prevention of HIV/Aids in Nairobi, Kenya. Towards this end, an analysis of the lyrics and musical gestures of four Kenyan pop music songs is undertaken in order to highlight their communicative capabilities in this regard. These songs, namely, are Lulumbe by Wasike wa Musungu, Juala by Circute and Jo-el, Vuta Pumz by The Longombas, and Dunia Mbaya Chunguze by Princess Jully. The context in which these musical analyses occur is provided in: - An overview of the Kenya of today, in particular that of the diverse and hybrid ethnic, linguistic, musical and cultural practices of Nairobi, and of the various youth cultures in that city, as well as in an overview of the extent of the HIV/Aids pandemic in Kenya, especially amongst the youth of Nairobi, with some reflection on existing interventions. - An overview of current trends in popular music analysis and an explanation of the author’s own eclectic semiotic analytical methodology within this context. The study concludes that a repeating strategy may be discerned on the part of the composers and performers in question, namely, to first engage audiences through language and music with which they are familiar, and then to encourage audiences to confront the unknown and unfamiliar in music and language, but also ultimately in terms of their social practices. The known and the familiar is highlighted both in the lyrics and in the music itself. It includes use of commonlyspoken languages and dialects, popular musical styles typical of the particular sub-culture, and references to the day-to-day experiences of the ordinary person.
- Full Text:
- Date Issued: 2009
National identity and nation-building in post-apartheid South Africa
- Authors: Stinson, Andrew Todd
- Date: 2009
- Subjects: Post-apartheid era -- South Africa , South Africa -- Politics and government -- 1994- , Nationalism -- South Africa , Civil society -- South Africa , Democracy -- South Africa , South Africa -- Social policy , Ethnicity -- South Africa , South Africa -- Economic conditions -- 1991- , South Africa -- Social conditions -- 1994-
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2832 , http://hdl.handle.net/10962/d1003042
- Description: Throughout South Africa’s post-Apartheid history, the ANC-led government has undertaken a distinct nation-building program in pursuit of “a truly united, democratic and prosperous South Africa” (ANC, 2007). This is reflected in a two-pronged approach, coupling political and socioeconomic transformation with the social-psychological aspect of forging a broad and inclusive national consciousness. The ANC’s “rainbow nation” approach embraces cultural diversity through what I shall call the practice of “interculturalism”. Interculturalism is a way of recognizing commonalities, reducing tensions and promoting the formation of social partnerships among different cultural groups. The ANC has also promoted a civic culture based on the principles of liberal democracy, non-racism, equality and the protection of individual rights. Interculturalism and civic nationalism are critically important factors to South African nation-building since together they foster a shared public culture and support meaningful participation in the creation of a truly just and democratic South Africa. Unfortunately, in many ways South African society remains deeply divided by race, ethnicity and economic inequality. This thesis analyses various theoretical approaches to national identity and nationbuilding with the aim of identifying several concepts which arguably throw light on the problems of South African nation-building and national identity formation. It is argued that interculturalism and civic nationalism are context appropriate approaches which have been adopted by the ANC to further an inclusive sense of shared public culture and promote participation in the creation of a shared public future. These approaches have led to the limited emergence of a broad South African national identity. However, South Africa’s commitment to socio-economic transformation has been less successful in generating widespread support for a broad national identity. While some of those previously disadvantaged under Apartheid have benefited from poverty alleviation schemes, service delivery initiatives and black economic empowerment programs, many continue to suffer from homelessness, unemployment and worsening economic conditions. Increasing economic marginalization has caused growing discontent among South Africa’s poor and constitutes the biggest threat to the formation of a cohesive national identity in South African society. Ultimately, it is argued that while interculturalism and civic nationalism have played an important role in fostering the growth of a broad national identity, true South African social cohesion will fail to emerge without a massive and sustained commitment to wide-ranging socio-economic transformation.
- Full Text:
- Date Issued: 2009
- Authors: Stinson, Andrew Todd
- Date: 2009
- Subjects: Post-apartheid era -- South Africa , South Africa -- Politics and government -- 1994- , Nationalism -- South Africa , Civil society -- South Africa , Democracy -- South Africa , South Africa -- Social policy , Ethnicity -- South Africa , South Africa -- Economic conditions -- 1991- , South Africa -- Social conditions -- 1994-
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2832 , http://hdl.handle.net/10962/d1003042
- Description: Throughout South Africa’s post-Apartheid history, the ANC-led government has undertaken a distinct nation-building program in pursuit of “a truly united, democratic and prosperous South Africa” (ANC, 2007). This is reflected in a two-pronged approach, coupling political and socioeconomic transformation with the social-psychological aspect of forging a broad and inclusive national consciousness. The ANC’s “rainbow nation” approach embraces cultural diversity through what I shall call the practice of “interculturalism”. Interculturalism is a way of recognizing commonalities, reducing tensions and promoting the formation of social partnerships among different cultural groups. The ANC has also promoted a civic culture based on the principles of liberal democracy, non-racism, equality and the protection of individual rights. Interculturalism and civic nationalism are critically important factors to South African nation-building since together they foster a shared public culture and support meaningful participation in the creation of a truly just and democratic South Africa. Unfortunately, in many ways South African society remains deeply divided by race, ethnicity and economic inequality. This thesis analyses various theoretical approaches to national identity and nationbuilding with the aim of identifying several concepts which arguably throw light on the problems of South African nation-building and national identity formation. It is argued that interculturalism and civic nationalism are context appropriate approaches which have been adopted by the ANC to further an inclusive sense of shared public culture and promote participation in the creation of a shared public future. These approaches have led to the limited emergence of a broad South African national identity. However, South Africa’s commitment to socio-economic transformation has been less successful in generating widespread support for a broad national identity. While some of those previously disadvantaged under Apartheid have benefited from poverty alleviation schemes, service delivery initiatives and black economic empowerment programs, many continue to suffer from homelessness, unemployment and worsening economic conditions. Increasing economic marginalization has caused growing discontent among South Africa’s poor and constitutes the biggest threat to the formation of a cohesive national identity in South African society. Ultimately, it is argued that while interculturalism and civic nationalism have played an important role in fostering the growth of a broad national identity, true South African social cohesion will fail to emerge without a massive and sustained commitment to wide-ranging socio-economic transformation.
- Full Text:
- Date Issued: 2009
Normative indicators for a black, Xhosa speaking population without tertiary education on four tests used to access malingering
- Authors: Wong, Andrea Jane
- Date: 2009
- Subjects: Malingering Neuropsychological tests Language and languages -- Ability testing Educational tests and measurements Education evaluation Xhosa (African people) -- Education
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3088 , http://hdl.handle.net/10962/d1002597
- Description: Malingering has become an increasing concern in neuropsychological assessment in recent years, and a wide range of tests have been designed and examined for the purpose of detecting malingering. Cut-off scores have been recommended for these tests in order to provide indications of malingering performances. However, the derived scores have been in respect of westernised populations of people with relatively high levels of education who speak English as their first language. Accordingly, the current study aimed to attain normative data and cut-off scores for four commonly employed neuropsychological tools, administered in English, on a population of black, South African, Xhosa-speaking people (N = 33), who attended a former DET-type school in the Eastern Cape, with a Grade 11-12 level of education, in the age range of 18 - 40 years. The targeted measures included the TOMM, the Rey-15 Item Memory Test, the Digit Span subtest of the WAIS-III, and the Trail Making Test. The obtained scores were poorer than the previously published cut-offs for at least one component of each of the tests investigated, except the TOMM. The fmdings of this study highlight the important role that the factors of culture, quality of education, and language play in neuropsychological test performance.
- Full Text:
- Date Issued: 2009
- Authors: Wong, Andrea Jane
- Date: 2009
- Subjects: Malingering Neuropsychological tests Language and languages -- Ability testing Educational tests and measurements Education evaluation Xhosa (African people) -- Education
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3088 , http://hdl.handle.net/10962/d1002597
- Description: Malingering has become an increasing concern in neuropsychological assessment in recent years, and a wide range of tests have been designed and examined for the purpose of detecting malingering. Cut-off scores have been recommended for these tests in order to provide indications of malingering performances. However, the derived scores have been in respect of westernised populations of people with relatively high levels of education who speak English as their first language. Accordingly, the current study aimed to attain normative data and cut-off scores for four commonly employed neuropsychological tools, administered in English, on a population of black, South African, Xhosa-speaking people (N = 33), who attended a former DET-type school in the Eastern Cape, with a Grade 11-12 level of education, in the age range of 18 - 40 years. The targeted measures included the TOMM, the Rey-15 Item Memory Test, the Digit Span subtest of the WAIS-III, and the Trail Making Test. The obtained scores were poorer than the previously published cut-offs for at least one component of each of the tests investigated, except the TOMM. The fmdings of this study highlight the important role that the factors of culture, quality of education, and language play in neuropsychological test performance.
- Full Text:
- Date Issued: 2009
Obstacles faced by news journalists in investigative reporting: analysis of four Botswana newspapers, June 2008 - October 2008
- Authors: Pule, Kediretswe
- Date: 2009
- Subjects: Investigative reporting , Journalism -- Political aspects , Journalists -- Legal status, laws, etc
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8398 , http://hdl.handle.net/10948/869 , Investigative reporting , Journalism -- Political aspects , Journalists -- Legal status, laws, etc
- Description: In this research study, the researcher investigates obstacles faced by news journalists in investigative journalism in a democracy as experienced in Botswana. Investigative journalism and democracy have a symbiotic relationship. This relationship serves to make the public sensitive about, and aware of, injustices and undemocratic practices and it could, ultimately, contribute significantly to the process of democratization (Faure 2005: 155). Unfortunately, in their endeavor to keep up with the ethos of investigative journalism, journalists meet obstacles that range from legal to financial issues. The author investigates those factors that reporters in Botswana rate as having the greatest impact on their investigative efforts. The study also assesses the attitudes of journalists in the country towards the roles and responsibilities of the fourth estate, which supports investigative reporting. Investigative journalism is centered on disclosure, described by six elements: public interest, theme, accuracy, follow-up reports, consequences and questioning the status quo (Faure 2005:160; Marron 1995:1). The researcher interrogated the current practice of investigative journalism in newsrooms in the Botswana context, by means of a self-administered questionnaire. A cumulative sum of scores of each rank order for each obstacle was used to observe the one rated the most impeding by Botswana journalists. Elementary descriptive statistics in the form of percentages were used to assess attitudes of Botswana journalists towards investigative journalism. The same method was used to assess the proportion of investigative stories in four sampled Botswana newspapers. The contents of the respective newspapers were assessed against the five elements of investigative reporting that include: theme, public interest, questioning the status quo, accuracy, follow-up reports and consequences.
- Full Text:
- Date Issued: 2009
- Authors: Pule, Kediretswe
- Date: 2009
- Subjects: Investigative reporting , Journalism -- Political aspects , Journalists -- Legal status, laws, etc
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8398 , http://hdl.handle.net/10948/869 , Investigative reporting , Journalism -- Political aspects , Journalists -- Legal status, laws, etc
- Description: In this research study, the researcher investigates obstacles faced by news journalists in investigative journalism in a democracy as experienced in Botswana. Investigative journalism and democracy have a symbiotic relationship. This relationship serves to make the public sensitive about, and aware of, injustices and undemocratic practices and it could, ultimately, contribute significantly to the process of democratization (Faure 2005: 155). Unfortunately, in their endeavor to keep up with the ethos of investigative journalism, journalists meet obstacles that range from legal to financial issues. The author investigates those factors that reporters in Botswana rate as having the greatest impact on their investigative efforts. The study also assesses the attitudes of journalists in the country towards the roles and responsibilities of the fourth estate, which supports investigative reporting. Investigative journalism is centered on disclosure, described by six elements: public interest, theme, accuracy, follow-up reports, consequences and questioning the status quo (Faure 2005:160; Marron 1995:1). The researcher interrogated the current practice of investigative journalism in newsrooms in the Botswana context, by means of a self-administered questionnaire. A cumulative sum of scores of each rank order for each obstacle was used to observe the one rated the most impeding by Botswana journalists. Elementary descriptive statistics in the form of percentages were used to assess attitudes of Botswana journalists towards investigative journalism. The same method was used to assess the proportion of investigative stories in four sampled Botswana newspapers. The contents of the respective newspapers were assessed against the five elements of investigative reporting that include: theme, public interest, questioning the status quo, accuracy, follow-up reports and consequences.
- Full Text:
- Date Issued: 2009
Optimizing the recovery rate of Mycobacterium species from gastric lavages in children at an urban Zambian hospital
- Authors: Lubasi, David
- Date: 2009
- Subjects: Mycobacterium , Tuberculosis in children -- Diagnosis -- Zambia
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10118 , http://hdl.handle.net/10948/1440 , Mycobacterium , Tuberculosis in children -- Diagnosis -- Zambia
- Description: Tuberculosis (TB) has re-emerged as a major worldwide public health hazard with increasing incidence among adults and children. Although cases among children represent a small percentage of all TB cases, they are a reservoir from which many adult cases will arise. Estimates indicate that 9 million people develop TB annually, out of which 1 million (11 percent) occur in children less than 15 years old. Childhood tuberculosis is on the increase worldwide because of persisting inability to conform the diagnosis, leading to a large number of children dying of undiagnosed tuberculosis. Diagnosis of pulmonary tuberculosis has depended on bacteriological examination of sputum. In most of the developing countries sputum smear microscopy has been used as it has been found to be cheap and relative efficient. As a result of the high TB burden, there is an urgent need for improved methods of laboratory diagnosis of TB. This is especially needed in children were diagnosis is more challenging as mycobacteria is being detected in fewer than 50 percent of the cases. Children cannot produce adequate sputum samples for examination. Their sputum samples, if produced, has a low bacterial yield and making detection of mycobacteria by using the smear microscopy difficult. Therefore, gastric lavages from children are being recommended as the best specimen for culture. In this study, gastric lavages from 408 children suspected of having tuberculosis were examined for the recovery of mycobacteria. Recovery was optimized by the use of the relatively new non-radiometric fully automated BACTEC MGIT 960. BACTEC MGIT 960 produced a positivity rate of 27.2 percent against 17.2 percent that of Lowenstein-Jensen (L-J) media, which is a conventional culture method used widely. The direct microscopy which is the cheapest traditional method used in diagnosis of tuberculosis (TB) yielded a 5.6 percent positive rate. The BACTEC MGIT 960 had also a very high isolate detection rate of 98.2 percent compared to that of L-J media of 61.9 percent, and only 20.4 percent were detected with the direct microscopy. On time taken to detection or mean time to detection (TTD) of v isolates, the BACTEC MGIT 960 technique had a shorter mean time to detection, 12.5 days as compared to 34.3 days shown by the L-J media technique. The study showed that children normally get tuberculosis from adult members of the household. A positive TB case was found in the households of 55.4 percent of the suspects. The study has found that 46.4 percent of the children below the age of 4 years developed the disease, compared to 10.5 percent the older children in the age group 10 to 14 years. The study found that tuberculosis in children is mainly caused by Mycobacterium tuberculosis. Out of the 113 isolates detected, 110 (97.3 percent) were M. tuberculosis. The remaining 2.7 percent were the non-tuberculous M. avium complex and M. kansasii. It was inconclusive whether the 2.7 percent of other species were causing tuberculosis and this need to be studied further.
- Full Text:
- Date Issued: 2009
- Authors: Lubasi, David
- Date: 2009
- Subjects: Mycobacterium , Tuberculosis in children -- Diagnosis -- Zambia
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10118 , http://hdl.handle.net/10948/1440 , Mycobacterium , Tuberculosis in children -- Diagnosis -- Zambia
- Description: Tuberculosis (TB) has re-emerged as a major worldwide public health hazard with increasing incidence among adults and children. Although cases among children represent a small percentage of all TB cases, they are a reservoir from which many adult cases will arise. Estimates indicate that 9 million people develop TB annually, out of which 1 million (11 percent) occur in children less than 15 years old. Childhood tuberculosis is on the increase worldwide because of persisting inability to conform the diagnosis, leading to a large number of children dying of undiagnosed tuberculosis. Diagnosis of pulmonary tuberculosis has depended on bacteriological examination of sputum. In most of the developing countries sputum smear microscopy has been used as it has been found to be cheap and relative efficient. As a result of the high TB burden, there is an urgent need for improved methods of laboratory diagnosis of TB. This is especially needed in children were diagnosis is more challenging as mycobacteria is being detected in fewer than 50 percent of the cases. Children cannot produce adequate sputum samples for examination. Their sputum samples, if produced, has a low bacterial yield and making detection of mycobacteria by using the smear microscopy difficult. Therefore, gastric lavages from children are being recommended as the best specimen for culture. In this study, gastric lavages from 408 children suspected of having tuberculosis were examined for the recovery of mycobacteria. Recovery was optimized by the use of the relatively new non-radiometric fully automated BACTEC MGIT 960. BACTEC MGIT 960 produced a positivity rate of 27.2 percent against 17.2 percent that of Lowenstein-Jensen (L-J) media, which is a conventional culture method used widely. The direct microscopy which is the cheapest traditional method used in diagnosis of tuberculosis (TB) yielded a 5.6 percent positive rate. The BACTEC MGIT 960 had also a very high isolate detection rate of 98.2 percent compared to that of L-J media of 61.9 percent, and only 20.4 percent were detected with the direct microscopy. On time taken to detection or mean time to detection (TTD) of v isolates, the BACTEC MGIT 960 technique had a shorter mean time to detection, 12.5 days as compared to 34.3 days shown by the L-J media technique. The study showed that children normally get tuberculosis from adult members of the household. A positive TB case was found in the households of 55.4 percent of the suspects. The study has found that 46.4 percent of the children below the age of 4 years developed the disease, compared to 10.5 percent the older children in the age group 10 to 14 years. The study found that tuberculosis in children is mainly caused by Mycobacterium tuberculosis. Out of the 113 isolates detected, 110 (97.3 percent) were M. tuberculosis. The remaining 2.7 percent were the non-tuberculous M. avium complex and M. kansasii. It was inconclusive whether the 2.7 percent of other species were causing tuberculosis and this need to be studied further.
- Full Text:
- Date Issued: 2009
Organisational restructuring and its impact on job satisfaction, career moblity and stress levels of employees at Lesotho Highlands Development Authority
- Authors: Mahloane, Katiso William
- Date: 2009
- Subjects: Employee morale , Organizational change , Employees -- Attitudes -- Evaluation , Job satisfaction , Stress management
- Language: English
- Type: Thesis , Masters , M Admin
- Identifier: vital:11648 , http://hdl.handle.net/10353/188 , Employee morale , Organizational change , Employees -- Attitudes -- Evaluation , Job satisfaction , Stress management
- Description: Organisations today are in a state of ever accelerating rate of change. Globalisation of the economy, increasing competition, technological innovation as well as global competition are seen to bring about the ever-accelerating pace of change in the working environment worldwide (Christen 2005:241). For this reason, employees are challenged by changes in their careers that they never anticipated, changes which in the long-run, result in stress conditions that bring negative consequences for both employees and the organisation in their wake. This chapter will provide the background to the topic of the study and survey what other studies have revealed about it. The objectives of the study, the research questions, the research objectives over and above the necessary hypotheses will also be mentioned and to conclude, the chapter will provide the theoretical framework in support of this study.As we may be aware, we live in a world of change, where everything constantly has reformed. Organisations are also part of that big change especially in the new millennium where re-engineering, downsizing, outsourcing and restructuring have become common terms associated with many organisations. Although a number of studies have tried to determine how organisational restructuring benefits the organisation, little has been done to find out how the welfare of employees is affected by the restructuring initiatives. This study investigates the perceptions that employees have of organisational restructuring. It investigates how their job satisfaction, career mobility and their stress levels are affected by restructuring process after the restructuring process as well the stress that such employees experience due to restructuring. A survey was conducted at Lesotho Highlands Development Authority, where data was obtained from 121 respondents and statistically analysed. The findings reflect a negative association between restructuring and stress levels and career mobility. The findings show that job satisfaction was still experienced by the employees at LHDA and that most respondents see organisational restructuring as something that benefits the organisation and has little to do with the interests of the workers.
- Full Text:
- Date Issued: 2009
- Authors: Mahloane, Katiso William
- Date: 2009
- Subjects: Employee morale , Organizational change , Employees -- Attitudes -- Evaluation , Job satisfaction , Stress management
- Language: English
- Type: Thesis , Masters , M Admin
- Identifier: vital:11648 , http://hdl.handle.net/10353/188 , Employee morale , Organizational change , Employees -- Attitudes -- Evaluation , Job satisfaction , Stress management
- Description: Organisations today are in a state of ever accelerating rate of change. Globalisation of the economy, increasing competition, technological innovation as well as global competition are seen to bring about the ever-accelerating pace of change in the working environment worldwide (Christen 2005:241). For this reason, employees are challenged by changes in their careers that they never anticipated, changes which in the long-run, result in stress conditions that bring negative consequences for both employees and the organisation in their wake. This chapter will provide the background to the topic of the study and survey what other studies have revealed about it. The objectives of the study, the research questions, the research objectives over and above the necessary hypotheses will also be mentioned and to conclude, the chapter will provide the theoretical framework in support of this study.As we may be aware, we live in a world of change, where everything constantly has reformed. Organisations are also part of that big change especially in the new millennium where re-engineering, downsizing, outsourcing and restructuring have become common terms associated with many organisations. Although a number of studies have tried to determine how organisational restructuring benefits the organisation, little has been done to find out how the welfare of employees is affected by the restructuring initiatives. This study investigates the perceptions that employees have of organisational restructuring. It investigates how their job satisfaction, career mobility and their stress levels are affected by restructuring process after the restructuring process as well the stress that such employees experience due to restructuring. A survey was conducted at Lesotho Highlands Development Authority, where data was obtained from 121 respondents and statistically analysed. The findings reflect a negative association between restructuring and stress levels and career mobility. The findings show that job satisfaction was still experienced by the employees at LHDA and that most respondents see organisational restructuring as something that benefits the organisation and has little to do with the interests of the workers.
- Full Text:
- Date Issued: 2009
Organizational culture and innovation: the case of the Namibian National Institute for Educational Development
- Piepmeyer, Gernot Maximilian
- Authors: Piepmeyer, Gernot Maximilian
- Date: 2009
- Subjects: National Institute for Educational Development (Namibia) Corporate culture -- Namibia Organizational behavior -- Namibia Technological innovations -- Namibia Education -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1685 , http://hdl.handle.net/10962/d1003568
- Description: The purpose of my research is to diagnose the organizational culture of the National Institute for Educational Development [NIED] , in particular to determine whether it is conducive to innovation, as was envisaged at the time of its inception. The diagnosis of NIED's organizational culture was done by using a hybrid qualitative and quantitative case study. A questionnaire, the Cameron and Quinn's Organizational Culture Assessment Instrument [OCAI], was given to all professional members at NIED, while six members of the NIED organization were interviewed. It emerged from the data, first, that the characteristics of the dominant NIED culture, using Cameron and Quinn's six dimensions of culture that produced an "overall culture profile" of NIED, are not likely to enhance innovativeness. Nevertheless, there is a strong preference towards a culture type favourable to innovation. Second, there are cultural factors antithetical to an innovative organizational culture. These include poor information flow and a lack of communication, negligible crossfunction interaction and freedom, and constraining hierarchical and bureaucratic structures. Third, NIED has, in the form of a "green paper," a set of critical norms, values and assumptions that characterize the culture of innovative organizations. Finally, there is evidence of the presence of cultural characteristics conducive to an innovative organizational culture. These include: learning how to learn; being pro-active in initiating change and innovativeness; and sustaining momentum, consistency and perseverance. The discrepancy between the existing organizational culture and the preferred organizational culture revealed by the overall cultural profile can be explained by the fact that the norms, values and assumptions that characterize the culture of innovative organizations and the cultural characteristics conducive to an innovative organizational culture are not fully infused into the whole organization. There is a tension between NIED's bureaucratic nature and its innovative mission. Organizational culture change, where NIED's structures and processes are aligned with its espoused vision and mission, is needed in order for it to be better placed to achieve its original pioneering mandate.
- Full Text:
- Date Issued: 2009
- Authors: Piepmeyer, Gernot Maximilian
- Date: 2009
- Subjects: National Institute for Educational Development (Namibia) Corporate culture -- Namibia Organizational behavior -- Namibia Technological innovations -- Namibia Education -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1685 , http://hdl.handle.net/10962/d1003568
- Description: The purpose of my research is to diagnose the organizational culture of the National Institute for Educational Development [NIED] , in particular to determine whether it is conducive to innovation, as was envisaged at the time of its inception. The diagnosis of NIED's organizational culture was done by using a hybrid qualitative and quantitative case study. A questionnaire, the Cameron and Quinn's Organizational Culture Assessment Instrument [OCAI], was given to all professional members at NIED, while six members of the NIED organization were interviewed. It emerged from the data, first, that the characteristics of the dominant NIED culture, using Cameron and Quinn's six dimensions of culture that produced an "overall culture profile" of NIED, are not likely to enhance innovativeness. Nevertheless, there is a strong preference towards a culture type favourable to innovation. Second, there are cultural factors antithetical to an innovative organizational culture. These include poor information flow and a lack of communication, negligible crossfunction interaction and freedom, and constraining hierarchical and bureaucratic structures. Third, NIED has, in the form of a "green paper," a set of critical norms, values and assumptions that characterize the culture of innovative organizations. Finally, there is evidence of the presence of cultural characteristics conducive to an innovative organizational culture. These include: learning how to learn; being pro-active in initiating change and innovativeness; and sustaining momentum, consistency and perseverance. The discrepancy between the existing organizational culture and the preferred organizational culture revealed by the overall cultural profile can be explained by the fact that the norms, values and assumptions that characterize the culture of innovative organizations and the cultural characteristics conducive to an innovative organizational culture are not fully infused into the whole organization. There is a tension between NIED's bureaucratic nature and its innovative mission. Organizational culture change, where NIED's structures and processes are aligned with its espoused vision and mission, is needed in order for it to be better placed to achieve its original pioneering mandate.
- Full Text:
- Date Issued: 2009
Phases of sustainable development in small and medium enterprise (SME) retail outlets
- Authors: Brower, Marlon
- Date: 2009
- Subjects: Sustainable development -- South Africa -- Nelson Mandela Bay Municipality , Small business -- South Africa -- Nelson Mandela Bay Municipality , Outlet stores -- South Africa -- Nelson Mandela Bay Municipality
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8806 , http://hdl.handle.net/10948/d1018506
- Description: SMEs play a vital role in the country. For the purpose of the study the focus was on SMEs in the Nelson Mandela Bay Municipality Jurisdiction. Businesses which met the SME criteria (refer to Chapter 1, Section 1.7.1), (Du Plessis, 1996: 162; Marx et al., 1998: 728) were included in this study. The study is formed around the aspects of business which contribute to the growth of the business in the long term. A specific study was conducted on the ethnic entrepreneur and the aspects that influence business growth. There are many factors which influence the growth of the business; for the purpose of this study, a specific focus was placed on: (1) knowledge with regard to business; (2) entrepreneurial culture; (3) brand management; (4) location of the business; (5) business relationships; and (6) cultural influences. These variables will determine how the growth of the business is ultimately influenced. The research can also discover from respondents what they view as important in their lives. The study then goes further to analyse whether the independent variables, as reacted to by the respondents, have a significant or non-significant effect on growth.
- Full Text:
- Date Issued: 2009
- Authors: Brower, Marlon
- Date: 2009
- Subjects: Sustainable development -- South Africa -- Nelson Mandela Bay Municipality , Small business -- South Africa -- Nelson Mandela Bay Municipality , Outlet stores -- South Africa -- Nelson Mandela Bay Municipality
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8806 , http://hdl.handle.net/10948/d1018506
- Description: SMEs play a vital role in the country. For the purpose of the study the focus was on SMEs in the Nelson Mandela Bay Municipality Jurisdiction. Businesses which met the SME criteria (refer to Chapter 1, Section 1.7.1), (Du Plessis, 1996: 162; Marx et al., 1998: 728) were included in this study. The study is formed around the aspects of business which contribute to the growth of the business in the long term. A specific study was conducted on the ethnic entrepreneur and the aspects that influence business growth. There are many factors which influence the growth of the business; for the purpose of this study, a specific focus was placed on: (1) knowledge with regard to business; (2) entrepreneurial culture; (3) brand management; (4) location of the business; (5) business relationships; and (6) cultural influences. These variables will determine how the growth of the business is ultimately influenced. The research can also discover from respondents what they view as important in their lives. The study then goes further to analyse whether the independent variables, as reacted to by the respondents, have a significant or non-significant effect on growth.
- Full Text:
- Date Issued: 2009
Phenolic compounds in water and the implications for rapid detection of indicator micro-organisms using ß-D-Galactosidase and ß-D-Glucuronidase
- Authors: Abboo, Sagaran
- Date: 2009
- Subjects: Water -- Purification -- Biological treatment , Pollutants -- Biodegradation , Phenol , Organic water pollutants , Water quality biological assessment , Water -- Pollution
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3978 , http://hdl.handle.net/10962/d1004037 , Water -- Purification -- Biological treatment , Pollutants -- Biodegradation , Phenol , Organic water pollutants , Water quality biological assessment , Water -- Pollution
- Description: Faecal contamination in water is detected using appropriate microbial models such as total coliforms, faecal coliforms and E. coli. Βeta-D-Galactosidase (β-GAL) and Beta-D-glucuronidase (β-GUD) are two marker enzymes that are used to test for the presence of total coliforms and E. coli in water samples, respectively. Various assay methods have been developed using chromogenic and fluorogenic substrates. In this study, the chromogenic substrates chlorophenol red β-D-galactopyranoside (CPRG) for β-GAL and p-nitrophenyl-β-D-galactopyranoside (PNPG) for β-GUD were used. Potential problems associated with this approach include interference from other organisms present in the environment (e.g. plants, algae and other bacteria), as well as the presence of certain chemicals, such as phenolic compounds in water. Phenolic compounds are present in the aquatic environment due to their extensive industrial applications. The USA Enviromental Protection Agency (EPA) lists 11 Priority Pollutant Phenols (PPP) due to their high level of toxicity. This study investigated the interfering effects of the eleven PPP found in water on the enzyme activities of both the β-GAL and β-GUD enzyme assays. The presence of these PPP in the β-GAL and β-GUD enzyme assays showed that over and underestimation of activity may occur due to inhibition or activation of these enzymes. Three types of inhibition to enzyme activities were identified from double reciprocal Lineweaver-Burk plots. The inhibition constants (Ki) were determined for all inhibitory phenolic compounds from appropriate secondary plots. Furthermore, this study presented a validated reverse phase high performance liquid chromatography (RP-HPLC) method, developed for the simultaneous detection, separation and determination of all eleven phenolic compounds found in the environment. This method demonstrated good linearity, reproducibility, accuracy and sensitivity. Environmental water samples were collected from rivers, streams, industrial sites and wastewater treatment plant effluent. These samples were extracted and concentrated using a solid phase extraction (SPE) procedure prior to analysis employing the newly developed HPLC method in this study. Seasonal variations on the presence of the PPP in the environment were observed at certain collection sites. The concentrations found were between 0.033 μg/ml for 2,4-dinitrophenol in a running stream to 0.890 mg/ml for pentachlorophenol from an tannery industrial site. These concentrations of phenolic compounds found in these environments were able to interfere with the β-GAL and β-GUD enzyme assays.
- Full Text:
- Date Issued: 2009
- Authors: Abboo, Sagaran
- Date: 2009
- Subjects: Water -- Purification -- Biological treatment , Pollutants -- Biodegradation , Phenol , Organic water pollutants , Water quality biological assessment , Water -- Pollution
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3978 , http://hdl.handle.net/10962/d1004037 , Water -- Purification -- Biological treatment , Pollutants -- Biodegradation , Phenol , Organic water pollutants , Water quality biological assessment , Water -- Pollution
- Description: Faecal contamination in water is detected using appropriate microbial models such as total coliforms, faecal coliforms and E. coli. Βeta-D-Galactosidase (β-GAL) and Beta-D-glucuronidase (β-GUD) are two marker enzymes that are used to test for the presence of total coliforms and E. coli in water samples, respectively. Various assay methods have been developed using chromogenic and fluorogenic substrates. In this study, the chromogenic substrates chlorophenol red β-D-galactopyranoside (CPRG) for β-GAL and p-nitrophenyl-β-D-galactopyranoside (PNPG) for β-GUD were used. Potential problems associated with this approach include interference from other organisms present in the environment (e.g. plants, algae and other bacteria), as well as the presence of certain chemicals, such as phenolic compounds in water. Phenolic compounds are present in the aquatic environment due to their extensive industrial applications. The USA Enviromental Protection Agency (EPA) lists 11 Priority Pollutant Phenols (PPP) due to their high level of toxicity. This study investigated the interfering effects of the eleven PPP found in water on the enzyme activities of both the β-GAL and β-GUD enzyme assays. The presence of these PPP in the β-GAL and β-GUD enzyme assays showed that over and underestimation of activity may occur due to inhibition or activation of these enzymes. Three types of inhibition to enzyme activities were identified from double reciprocal Lineweaver-Burk plots. The inhibition constants (Ki) were determined for all inhibitory phenolic compounds from appropriate secondary plots. Furthermore, this study presented a validated reverse phase high performance liquid chromatography (RP-HPLC) method, developed for the simultaneous detection, separation and determination of all eleven phenolic compounds found in the environment. This method demonstrated good linearity, reproducibility, accuracy and sensitivity. Environmental water samples were collected from rivers, streams, industrial sites and wastewater treatment plant effluent. These samples were extracted and concentrated using a solid phase extraction (SPE) procedure prior to analysis employing the newly developed HPLC method in this study. Seasonal variations on the presence of the PPP in the environment were observed at certain collection sites. The concentrations found were between 0.033 μg/ml for 2,4-dinitrophenol in a running stream to 0.890 mg/ml for pentachlorophenol from an tannery industrial site. These concentrations of phenolic compounds found in these environments were able to interfere with the β-GAL and β-GUD enzyme assays.
- Full Text:
- Date Issued: 2009
Photosynthetic and evolutionary determinants of the response of selected C3 and C4 (NADP-ME) grasses to fire
- Authors: Martin, Tarryn
- Date: 2009
- Subjects: Photosynthesis , Carbon -- Metabolism , Grasses -- Adaptation , Plants -- Effect of fires on , Grasses -- Research , Grasses -- Physiology , Grasses -- Evolution , Grasslands -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4211 , http://hdl.handle.net/10962/d1003780 , Photosynthesis , Carbon -- Metabolism , Grasses -- Adaptation , Plants -- Effect of fires on , Grasses -- Research , Grasses -- Physiology , Grasses -- Evolution , Grasslands -- Research
- Description: Species possess characteristics that are considered adapted to burning and these allow them to outcompete species and dominate in fire prone environments. It has therefore been proposed that fire might have played a critical role in the observed expansion of the grasslands, during the late Miocene. The aim of this study was (i) to investigate whether plant response to fire was a result of physiology or (ii) whether it was due to phylogenetic history. This was achieved by doing a pair-wise comparison between Panicoideae (and Panicoideae) and non-Panicoideae (Danthonioideae and Aristidoideae) species. Pre-fire characteristics, that would enhance fire frequency and assist with plant recovery after burning, were compared across phylogenies and photosynthetic type. Post fire plant recovery was then followed in a field and pot comparison which examined the re-growth of the leaf canopy area, leaf mass, above-ground biomass and the cost of this to the below-ground biomass. The pre-fire characteristics showed both a photosynthetic and phylogenetic response. It was found that the species showed a greater canopy death during winter and had a lower moisture content than the species. These characteristics would potentially contribute towards a larger fuel load in the species. However, the comparison of the dead standing biomass at the end of winter and the below-ground biomass, showed a phylogenetic response with the Panicoideae having a proportionally larger dead standing biomass and below-ground biomass than the non-Panicoideae. These results suggest that not only did the Panicoideae have a larger potential fuel load but that they also shunted carbon below-ground, enabling a fast recovery after being burned. The post-fire results were more strongly determined by phylogeny than by photosynthetic type. The Panicoideae recovered faster and more completely than the non-Panicoideae grasses, possibly contributing to their success and expansion under conditions of increased fire frequency. Although recovery of the and Panicoideae were similar, frequently burnt grasslands are dominated by the Panicoideae. Hence, this dominance cannot be explained by differences in their fire responses and may be determined by the post-fire environmental conditions that potentially advantage species possessing the photosynthetic pathway. Panicoideae dominance is limited to mesic environments where fire is the likely driver of grassland expansion while more arid environments are dominated by non-Panicoideae species. Representative species from these non-Panicoid subfamilies showed poor recovery after fire. This suggests that factors other than fire were the likely drivers of these xeric grassland expansions. The ability of these subfamilies, and particularly the species, to cope with drought remains a likely selective mechanism that requires further research.
- Full Text:
- Date Issued: 2009
- Authors: Martin, Tarryn
- Date: 2009
- Subjects: Photosynthesis , Carbon -- Metabolism , Grasses -- Adaptation , Plants -- Effect of fires on , Grasses -- Research , Grasses -- Physiology , Grasses -- Evolution , Grasslands -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4211 , http://hdl.handle.net/10962/d1003780 , Photosynthesis , Carbon -- Metabolism , Grasses -- Adaptation , Plants -- Effect of fires on , Grasses -- Research , Grasses -- Physiology , Grasses -- Evolution , Grasslands -- Research
- Description: Species possess characteristics that are considered adapted to burning and these allow them to outcompete species and dominate in fire prone environments. It has therefore been proposed that fire might have played a critical role in the observed expansion of the grasslands, during the late Miocene. The aim of this study was (i) to investigate whether plant response to fire was a result of physiology or (ii) whether it was due to phylogenetic history. This was achieved by doing a pair-wise comparison between Panicoideae (and Panicoideae) and non-Panicoideae (Danthonioideae and Aristidoideae) species. Pre-fire characteristics, that would enhance fire frequency and assist with plant recovery after burning, were compared across phylogenies and photosynthetic type. Post fire plant recovery was then followed in a field and pot comparison which examined the re-growth of the leaf canopy area, leaf mass, above-ground biomass and the cost of this to the below-ground biomass. The pre-fire characteristics showed both a photosynthetic and phylogenetic response. It was found that the species showed a greater canopy death during winter and had a lower moisture content than the species. These characteristics would potentially contribute towards a larger fuel load in the species. However, the comparison of the dead standing biomass at the end of winter and the below-ground biomass, showed a phylogenetic response with the Panicoideae having a proportionally larger dead standing biomass and below-ground biomass than the non-Panicoideae. These results suggest that not only did the Panicoideae have a larger potential fuel load but that they also shunted carbon below-ground, enabling a fast recovery after being burned. The post-fire results were more strongly determined by phylogeny than by photosynthetic type. The Panicoideae recovered faster and more completely than the non-Panicoideae grasses, possibly contributing to their success and expansion under conditions of increased fire frequency. Although recovery of the and Panicoideae were similar, frequently burnt grasslands are dominated by the Panicoideae. Hence, this dominance cannot be explained by differences in their fire responses and may be determined by the post-fire environmental conditions that potentially advantage species possessing the photosynthetic pathway. Panicoideae dominance is limited to mesic environments where fire is the likely driver of grassland expansion while more arid environments are dominated by non-Panicoideae species. Representative species from these non-Panicoid subfamilies showed poor recovery after fire. This suggests that factors other than fire were the likely drivers of these xeric grassland expansions. The ability of these subfamilies, and particularly the species, to cope with drought remains a likely selective mechanism that requires further research.
- Full Text:
- Date Issued: 2009
Phylogeography and epifauna of two intertidal seaweeds on the coast of South Africa
- Authors: Mmonwa, Lucas Kolobe
- Date: 2009
- Subjects: Phylogeography -- South Africa , Marine algae -- South Africa , Red algae -- South Africa , Gelidium -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5738 , http://hdl.handle.net/10962/d1005424 , Phylogeography -- South Africa , Marine algae -- South Africa , Red algae -- South Africa , Gelidium -- South Africa
- Description: Southern African biogeographic boundaries delimit the phylogeographic distribution of some coastal and estuarine invertebrates. This study investigated the impact of these boundaries on the phylogeographic distribution of two intertidal red seaweeds, Gelidium pristoides and Hypnea spicifera using the mitochondrial Cox2-3 spacer and the nuclear ITS1 regions. G. pristoides spores have short distance-dispersal, while long distance-dispersal is more likely in H. spicifera via spores and drifting fertile thallus fragments. Both markers revealed a south-western and south-eastern lineage within G. pristoides but the breaks between lineages do not coincide with any recognised biogeographic limits. The Cox2-3 spacer revealed a boundary between the two lineages at the Alexandria Coastal Dunefield (ACD) and ITS1 at the Gamtoos-Van Stadens Dunefields (GVD) which is approximately 80km west of the ACD. The minor difference between the two markers regarding location of the phylogeographic boundary is probably due to the dating differences between the two dunefields. The ACD as developed currently is superimposed on the ancient dunefields which formed during the Pleistocene, coinciding with the Cox2-3 spacer sequences divergence which dates back 500,000 - 580,000 years. The GVD formed during the Holocene (6,500 - 4,000 years ago), coinciding with the ITS1 sequences divergence which dates 4,224 - 4,928 years ago. Thus, these phylogeographic boundaries probably appeared without the influence of biogeographic boundaries, but rather due to the lack of suitable habitat in the dunefields, coupled with short dispersal-distances of the spores. Analysis of the ITS1 and Cox2-3 spacer regions in H. spicifera revealed that the species is characterized by uniform genetic structure along the coastline. This reflects the species`s potential for long range expansion as it inhabits both the intertidal and subtidal zones; and this presumably leads to high gene flow among populations. The ITS1 sequences showed minimal genetic variation of one substitution between the gametophyte and tetrasporophyte generations within H. spicifera. This suggests the predominance of asexual reproduction, which reduces gene flow and fixes alleles between generations. ANOSIM and Bray-Curtis cluster analyses showed scale-dependant variation in the abundances of epifauna (mainly amphipod, isopod, mollusc and polychaete species) on G. pristoides. At small local (within site) and large (among sites) scales, there were weak and no structure in epifaunal abundances respectively. However, at larger, biogeographic scales, samples from the same biogeographic region tended to be clustered together. Thus, there was a group containing predominantly south coast samples and a group containing east coast samples mixed with the remaining south coast samples. Such scale-dependant variation in epifaunal abundances is probably due to the effects of factors driving species richness at small local (within site) scales (e.g. wave exposure, seaweed biomass) and at larger, biogeographic scales (e.g. surface sea temperature). Moreover, at very small (individual samples) scales; there was no correlation between epifauna composition and genotype of the seaweed. Seaweed samples characterized by distinct ITS1 or Cox2-3 spacer sequences did not show any significant differences in epifaunal composition. Although the distributional pattern of the epifaunal community observed at large biogeographic scale is not clear, it seems to be associated with the biogeographic regions. However, phylogeographic distribution of Gelidium pristoides is not connected to biogeographic regions. Thus, at larger, biogeographic scales, there is no correlation between phylogeographic distribution of G. pristoides and distribution of the associated fauna
- Full Text:
- Date Issued: 2009
- Authors: Mmonwa, Lucas Kolobe
- Date: 2009
- Subjects: Phylogeography -- South Africa , Marine algae -- South Africa , Red algae -- South Africa , Gelidium -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5738 , http://hdl.handle.net/10962/d1005424 , Phylogeography -- South Africa , Marine algae -- South Africa , Red algae -- South Africa , Gelidium -- South Africa
- Description: Southern African biogeographic boundaries delimit the phylogeographic distribution of some coastal and estuarine invertebrates. This study investigated the impact of these boundaries on the phylogeographic distribution of two intertidal red seaweeds, Gelidium pristoides and Hypnea spicifera using the mitochondrial Cox2-3 spacer and the nuclear ITS1 regions. G. pristoides spores have short distance-dispersal, while long distance-dispersal is more likely in H. spicifera via spores and drifting fertile thallus fragments. Both markers revealed a south-western and south-eastern lineage within G. pristoides but the breaks between lineages do not coincide with any recognised biogeographic limits. The Cox2-3 spacer revealed a boundary between the two lineages at the Alexandria Coastal Dunefield (ACD) and ITS1 at the Gamtoos-Van Stadens Dunefields (GVD) which is approximately 80km west of the ACD. The minor difference between the two markers regarding location of the phylogeographic boundary is probably due to the dating differences between the two dunefields. The ACD as developed currently is superimposed on the ancient dunefields which formed during the Pleistocene, coinciding with the Cox2-3 spacer sequences divergence which dates back 500,000 - 580,000 years. The GVD formed during the Holocene (6,500 - 4,000 years ago), coinciding with the ITS1 sequences divergence which dates 4,224 - 4,928 years ago. Thus, these phylogeographic boundaries probably appeared without the influence of biogeographic boundaries, but rather due to the lack of suitable habitat in the dunefields, coupled with short dispersal-distances of the spores. Analysis of the ITS1 and Cox2-3 spacer regions in H. spicifera revealed that the species is characterized by uniform genetic structure along the coastline. This reflects the species`s potential for long range expansion as it inhabits both the intertidal and subtidal zones; and this presumably leads to high gene flow among populations. The ITS1 sequences showed minimal genetic variation of one substitution between the gametophyte and tetrasporophyte generations within H. spicifera. This suggests the predominance of asexual reproduction, which reduces gene flow and fixes alleles between generations. ANOSIM and Bray-Curtis cluster analyses showed scale-dependant variation in the abundances of epifauna (mainly amphipod, isopod, mollusc and polychaete species) on G. pristoides. At small local (within site) and large (among sites) scales, there were weak and no structure in epifaunal abundances respectively. However, at larger, biogeographic scales, samples from the same biogeographic region tended to be clustered together. Thus, there was a group containing predominantly south coast samples and a group containing east coast samples mixed with the remaining south coast samples. Such scale-dependant variation in epifaunal abundances is probably due to the effects of factors driving species richness at small local (within site) scales (e.g. wave exposure, seaweed biomass) and at larger, biogeographic scales (e.g. surface sea temperature). Moreover, at very small (individual samples) scales; there was no correlation between epifauna composition and genotype of the seaweed. Seaweed samples characterized by distinct ITS1 or Cox2-3 spacer sequences did not show any significant differences in epifaunal composition. Although the distributional pattern of the epifaunal community observed at large biogeographic scale is not clear, it seems to be associated with the biogeographic regions. However, phylogeographic distribution of Gelidium pristoides is not connected to biogeographic regions. Thus, at larger, biogeographic scales, there is no correlation between phylogeographic distribution of G. pristoides and distribution of the associated fauna
- Full Text:
- Date Issued: 2009
Planning and managing curriculum implementation in rural schools: an investigation
- Authors: Labane, Nokubonga
- Date: 2009
- Subjects: Curriculum planning -- South Africa , Teacher participation in curriculum planning , Education -- South Africa -- Curricula
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9522 , http://hdl.handle.net/10948/998 , Curriculum planning -- South Africa , Teacher participation in curriculum planning , Education -- South Africa -- Curricula
- Description: Fleisch (2002) and Jansen and Christie (1999) hold that implementation of the national school curriculum in post-apartheid South Africa was riddled with uncertainties, ineffective classroom management and a general lack of academic performance by learners, mainly as a result of inadequate training and support (SMTs) to support the implementation process through proper planning and subsequent management of the implementation (Rogan and Grayson, 2003:1172-1195). Middlewood (2003a: 66- 68) thus assigns the primary responsibility of planning, managing and overseeing the curriculum implementation process to the SMT. Research problem and question 1 In the context of this study, the School Management Team (SMT) includes the school principal, the deputy-principal and the head(s) of department(s) or senior teachers. 4 for teachers in the classroom. Having considered the above essential aspects related to curriculum implementation, there is thus reason to be concerned about the effectiveness of curriculum implementation in South African schools, specifically in rural schools. Due to their remoteness, limited resources, and fluctuating quality of teacher expertise, these schools are often more challenged in terms of curriculum implementation (Delport and Mangwaya, 2008:224). Although there are many factors affecting the (in)effectiveness of implementation, this study regards a school’s curriculum implementation plans and the subsequent management of these implementation plans as crucial to ensuring successful implementation of a new curriculum. The central research problem that guided this study thus relates to the planning and subsequent management of curriculum implementation at school level. The above problem has culminated in the formulation of the following research question: How do selected rural schools plan and manage curriculum implementation?.
- Full Text:
- Date Issued: 2009
- Authors: Labane, Nokubonga
- Date: 2009
- Subjects: Curriculum planning -- South Africa , Teacher participation in curriculum planning , Education -- South Africa -- Curricula
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9522 , http://hdl.handle.net/10948/998 , Curriculum planning -- South Africa , Teacher participation in curriculum planning , Education -- South Africa -- Curricula
- Description: Fleisch (2002) and Jansen and Christie (1999) hold that implementation of the national school curriculum in post-apartheid South Africa was riddled with uncertainties, ineffective classroom management and a general lack of academic performance by learners, mainly as a result of inadequate training and support (SMTs) to support the implementation process through proper planning and subsequent management of the implementation (Rogan and Grayson, 2003:1172-1195). Middlewood (2003a: 66- 68) thus assigns the primary responsibility of planning, managing and overseeing the curriculum implementation process to the SMT. Research problem and question 1 In the context of this study, the School Management Team (SMT) includes the school principal, the deputy-principal and the head(s) of department(s) or senior teachers. 4 for teachers in the classroom. Having considered the above essential aspects related to curriculum implementation, there is thus reason to be concerned about the effectiveness of curriculum implementation in South African schools, specifically in rural schools. Due to their remoteness, limited resources, and fluctuating quality of teacher expertise, these schools are often more challenged in terms of curriculum implementation (Delport and Mangwaya, 2008:224). Although there are many factors affecting the (in)effectiveness of implementation, this study regards a school’s curriculum implementation plans and the subsequent management of these implementation plans as crucial to ensuring successful implementation of a new curriculum. The central research problem that guided this study thus relates to the planning and subsequent management of curriculum implementation at school level. The above problem has culminated in the formulation of the following research question: How do selected rural schools plan and manage curriculum implementation?.
- Full Text:
- Date Issued: 2009
Polymers, catalysts and nanostructures a hybrid approach to biomolecule detection
- Authors: Frith, Kelly-Anne
- Date: 2009
- Subjects: Polymers , Nanostructured materials , Biomolecules , Tryptophan , Melatonin , Electrodes , Electrochemistry , Tryptophan oxygenase
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3980 , http://hdl.handle.net/10962/d1004039 , Polymers , Nanostructured materials , Biomolecules , Tryptophan , Melatonin , Electrodes , Electrochemistry , Tryptophan oxygenase
- Description: The main goals in electroanalytical sensing are towards improved sensitivity and selectivity, or specificity, of an analyte. There are several approaches to achieving these goals with the main approach being modification of an electrode surface with synthetic or natural catalysts (enzymes), polymers and also utilisation of nanostructured materials. At present, there is a strong movement towards hybrid sensing which couple different properties of two or more surface modification approaches. In this thesis, a range of these surface modifications were explored for analysis and detection of two main analytes: the amino acid, tryptophan (Trp); and, the neurotransmitter, dopamine (DA). Specifically, this thesis aimed to utilise these methods to enhance the sensitivity and selectivity for Trp over an interferent, the indoleamine, melatonin (Mel); and, DA over the vitamin, ascorbic acid (AA). For Trp detection, immobilisation of an enzyme, Tryptophanase (Trpase) resulted in poor selectivity for the analyte. However, enhanced sensitivity and selectivity was achieved through pH manipulation of the electrolyte medium at a Nafion®-modified electrode surface for both Trp and Mel. At pH 3.0, the Mel and Trp anodic peak potentials were sufficiently resolved allowing for an LOD of 1.60 and 1.62 nM,respectively, and permitting the accurate analysis of Trp in a dietary supplement containing Mel. Multi-walled carbon nanotubes (MWCNTs) suspended in Nafion® exhibited further increases in the signal responses of these analytes at pH 3.0 and 7.4 with minimal change in the resolution of the anodic peaks. A lower sensitivity was, therefore, observed at the Nafion® and MWCNT modified electrode compared to the Nafion®-modified electrode at pH 3.0 with LODs of 0.59 and 0.80 nM exhibited for Trp and Mel, respectively. Enhanced selectivity for Trp in the presence of Mel can be achieved with MWCNTs in the presence of metallotetrasulphonated phthalocyanines (MTSPcs) particularly at pH 3.0, owing to cation exchange effects. However, the lack of sensitivity towards Trp, and even Mel, at this CoTSPc and MWCNT modified electrode remains a drawback. For DA, detection at the MWCNT and Nafion® surface resulted in improved sensitivity over that of both the bare electrode (613.0 nM) and the Nafion® modified electrode (1045.1 nM) with a calculated LOD of 133.9 nM at this layer. Furthermore, improvements in the selectivity of DA were achieved at the Nafion® and MWCNT modified electrode as exclusion of AA (150 μM) was achieved. At the MWCNT and CoTSPc surface, AA was excluded up to 130 μM with sensitivity for DA extending as low as 14.3 nM, far greater than observed for Trp and Mel. These concentrations are well within physiological concentration ranges and represent the most significant solution yet in terms of AA exclusion and enhanced sensitivity for DA. An examination of the surface layering by impedance spectroscopy and atomic force microscopy indicates that the success of the hybrid sensor utilising CoTSPc and MWCNTs lay in improved dispersion of MWCNTs and improved electron transfer kinetics, facilitated by the net charge of the materials present. This thesis, thus, showed the utility of a judicious selection of synthetic and biological catalysts, polymers and carbon nanomaterials towards a hybrid approach to the electrochemical sensing of Trp, Mel, DA and AA with focus on sensitivity and selectivity of these analytes.
- Full Text:
- Date Issued: 2009
- Authors: Frith, Kelly-Anne
- Date: 2009
- Subjects: Polymers , Nanostructured materials , Biomolecules , Tryptophan , Melatonin , Electrodes , Electrochemistry , Tryptophan oxygenase
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3980 , http://hdl.handle.net/10962/d1004039 , Polymers , Nanostructured materials , Biomolecules , Tryptophan , Melatonin , Electrodes , Electrochemistry , Tryptophan oxygenase
- Description: The main goals in electroanalytical sensing are towards improved sensitivity and selectivity, or specificity, of an analyte. There are several approaches to achieving these goals with the main approach being modification of an electrode surface with synthetic or natural catalysts (enzymes), polymers and also utilisation of nanostructured materials. At present, there is a strong movement towards hybrid sensing which couple different properties of two or more surface modification approaches. In this thesis, a range of these surface modifications were explored for analysis and detection of two main analytes: the amino acid, tryptophan (Trp); and, the neurotransmitter, dopamine (DA). Specifically, this thesis aimed to utilise these methods to enhance the sensitivity and selectivity for Trp over an interferent, the indoleamine, melatonin (Mel); and, DA over the vitamin, ascorbic acid (AA). For Trp detection, immobilisation of an enzyme, Tryptophanase (Trpase) resulted in poor selectivity for the analyte. However, enhanced sensitivity and selectivity was achieved through pH manipulation of the electrolyte medium at a Nafion®-modified electrode surface for both Trp and Mel. At pH 3.0, the Mel and Trp anodic peak potentials were sufficiently resolved allowing for an LOD of 1.60 and 1.62 nM,respectively, and permitting the accurate analysis of Trp in a dietary supplement containing Mel. Multi-walled carbon nanotubes (MWCNTs) suspended in Nafion® exhibited further increases in the signal responses of these analytes at pH 3.0 and 7.4 with minimal change in the resolution of the anodic peaks. A lower sensitivity was, therefore, observed at the Nafion® and MWCNT modified electrode compared to the Nafion®-modified electrode at pH 3.0 with LODs of 0.59 and 0.80 nM exhibited for Trp and Mel, respectively. Enhanced selectivity for Trp in the presence of Mel can be achieved with MWCNTs in the presence of metallotetrasulphonated phthalocyanines (MTSPcs) particularly at pH 3.0, owing to cation exchange effects. However, the lack of sensitivity towards Trp, and even Mel, at this CoTSPc and MWCNT modified electrode remains a drawback. For DA, detection at the MWCNT and Nafion® surface resulted in improved sensitivity over that of both the bare electrode (613.0 nM) and the Nafion® modified electrode (1045.1 nM) with a calculated LOD of 133.9 nM at this layer. Furthermore, improvements in the selectivity of DA were achieved at the Nafion® and MWCNT modified electrode as exclusion of AA (150 μM) was achieved. At the MWCNT and CoTSPc surface, AA was excluded up to 130 μM with sensitivity for DA extending as low as 14.3 nM, far greater than observed for Trp and Mel. These concentrations are well within physiological concentration ranges and represent the most significant solution yet in terms of AA exclusion and enhanced sensitivity for DA. An examination of the surface layering by impedance spectroscopy and atomic force microscopy indicates that the success of the hybrid sensor utilising CoTSPc and MWCNTs lay in improved dispersion of MWCNTs and improved electron transfer kinetics, facilitated by the net charge of the materials present. This thesis, thus, showed the utility of a judicious selection of synthetic and biological catalysts, polymers and carbon nanomaterials towards a hybrid approach to the electrochemical sensing of Trp, Mel, DA and AA with focus on sensitivity and selectivity of these analytes.
- Full Text:
- Date Issued: 2009
Potential of sorghum and finger millet to enhance household food security in Zimbabwe's semi-arid regions: a case study of communal areas in Masvingo Province
- Authors: Mukarumbwa, Peter
- Date: 2009
- Subjects: Food security -- Zimbabwe Case studies , Food supply -- Zimbabwe Case studies , Crops -- Zimbabwe Case studies , Sorghum -- Zimbabwe , Poverty -- Zimbabwe , Millets -- Economic aspects -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MSc Agric (Agricultural Economics)
- Identifier: vital:11186 , http://hdl.handle.net/10353/368 , Food security -- Zimbabwe Case studies , Food supply -- Zimbabwe Case studies , Crops -- Zimbabwe Case studies , Sorghum -- Zimbabwe , Poverty -- Zimbabwe , Millets -- Economic aspects -- Zimbabwe
- Description: Successive droughts, in Zimbabwe compounded by other economic shocks in recent years have resulted in decreased maize productivity amongst the communal farmers most of whom reside in regions IV and V which are considered semi-arid. This has given rise to the need to find alternative food crops, which may be suitable for these areas. Generally, research in the world indicates that sorghum and millet have the potential to end chronic food insecurity in semi-arid areas because of their drought tolerance. Whilst this might be the case, research, government policy and assistance from non-governmental organizations on food crop production in Zimbabwe have shown a continual inclination to maize production in semi-arid areas. However, maize is regarded as a high risk crop in these regions. The main objective of the study was to investigate major factors affecting smallholder farmers in semi-arid areas, from increased production of small grains, specifically sorghum and finger millet. The study was conducted in two rural districts of Masvingo and Gutu, which lie in natural region IV in Masvingo Province. The questionnaire was used as the main tool of inquiry to gather data from households in selected villages within these districts. Questionnaires were administered through face-to-face interviews. The total sample size was 120. The logistic regression model was used to analyze data. The results revealed that, at the 5% level, labour, cattle ownership, farm size, age, extension, yields and access to credit significantly influence sorghum and finger millet production. These findings suggest that an adjustment in each one of the significant variables can significantly influence the probability of participation in small grain production. In view of these research findings, a policy shift that encourages increased production of finger millet and sorghum in Zimbabwe‟s semi-arid regions is proposed. It is suggested that this may increase household food security in these regions.
- Full Text:
- Date Issued: 2009
- Authors: Mukarumbwa, Peter
- Date: 2009
- Subjects: Food security -- Zimbabwe Case studies , Food supply -- Zimbabwe Case studies , Crops -- Zimbabwe Case studies , Sorghum -- Zimbabwe , Poverty -- Zimbabwe , Millets -- Economic aspects -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MSc Agric (Agricultural Economics)
- Identifier: vital:11186 , http://hdl.handle.net/10353/368 , Food security -- Zimbabwe Case studies , Food supply -- Zimbabwe Case studies , Crops -- Zimbabwe Case studies , Sorghum -- Zimbabwe , Poverty -- Zimbabwe , Millets -- Economic aspects -- Zimbabwe
- Description: Successive droughts, in Zimbabwe compounded by other economic shocks in recent years have resulted in decreased maize productivity amongst the communal farmers most of whom reside in regions IV and V which are considered semi-arid. This has given rise to the need to find alternative food crops, which may be suitable for these areas. Generally, research in the world indicates that sorghum and millet have the potential to end chronic food insecurity in semi-arid areas because of their drought tolerance. Whilst this might be the case, research, government policy and assistance from non-governmental organizations on food crop production in Zimbabwe have shown a continual inclination to maize production in semi-arid areas. However, maize is regarded as a high risk crop in these regions. The main objective of the study was to investigate major factors affecting smallholder farmers in semi-arid areas, from increased production of small grains, specifically sorghum and finger millet. The study was conducted in two rural districts of Masvingo and Gutu, which lie in natural region IV in Masvingo Province. The questionnaire was used as the main tool of inquiry to gather data from households in selected villages within these districts. Questionnaires were administered through face-to-face interviews. The total sample size was 120. The logistic regression model was used to analyze data. The results revealed that, at the 5% level, labour, cattle ownership, farm size, age, extension, yields and access to credit significantly influence sorghum and finger millet production. These findings suggest that an adjustment in each one of the significant variables can significantly influence the probability of participation in small grain production. In view of these research findings, a policy shift that encourages increased production of finger millet and sorghum in Zimbabwe‟s semi-arid regions is proposed. It is suggested that this may increase household food security in these regions.
- Full Text:
- Date Issued: 2009
Precooling strategies for passenger vehicles
- Wachsmuth, Carsten Ulrich Harro
- Authors: Wachsmuth, Carsten Ulrich Harro
- Date: 2009
- Subjects: Automobiles -- Air conditioning , Air conditioning
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9643 , http://hdl.handle.net/10948/930 , Automobiles -- Air conditioning , Air conditioning
- Description: By ventilating the vehicle’s interior during a soak, the peak cooling load is reduced and therefore the air-conditioning needs less power. This in turn translates to a smaller air-conditioning unit which would consume less power, be lighter and more compact. This solar driven ventilation of the vehicle’s interior during a soak is defined as precooling. During this project the best precooling strategy for passenger vehicles was found by investigating and testing different precooling strategies and evaluating them according to their thermodynamic performance, their potential implementation and their influence on the required cooling performance of the airconditioning cycle. The best performances were achieved by strategies with a high air flow rate and a relatively low air inlet temperature. Two categories of precooling strategies were examined: natural convection and forced convection strategies. Openings in the vehicle’s body that fit to all strategies had to be found; with a big potential concerning their thermodynamic performance and other aspects like prevention against water penetration. The best investigated precooling strategies proved to be the one which used the design outlet as an inlet and the opening of the HVAC as an outlet. With these openings a good air flow through the whole cabin can be guaranteed. In addition to that the strategy only uses existing openings of the body which prevent against water penetration. The required installation space for this strategy already exists and can be considered for the package of next generation vehicles.
- Full Text:
- Date Issued: 2009
- Authors: Wachsmuth, Carsten Ulrich Harro
- Date: 2009
- Subjects: Automobiles -- Air conditioning , Air conditioning
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9643 , http://hdl.handle.net/10948/930 , Automobiles -- Air conditioning , Air conditioning
- Description: By ventilating the vehicle’s interior during a soak, the peak cooling load is reduced and therefore the air-conditioning needs less power. This in turn translates to a smaller air-conditioning unit which would consume less power, be lighter and more compact. This solar driven ventilation of the vehicle’s interior during a soak is defined as precooling. During this project the best precooling strategy for passenger vehicles was found by investigating and testing different precooling strategies and evaluating them according to their thermodynamic performance, their potential implementation and their influence on the required cooling performance of the airconditioning cycle. The best performances were achieved by strategies with a high air flow rate and a relatively low air inlet temperature. Two categories of precooling strategies were examined: natural convection and forced convection strategies. Openings in the vehicle’s body that fit to all strategies had to be found; with a big potential concerning their thermodynamic performance and other aspects like prevention against water penetration. The best investigated precooling strategies proved to be the one which used the design outlet as an inlet and the opening of the HVAC as an outlet. With these openings a good air flow through the whole cabin can be guaranteed. In addition to that the strategy only uses existing openings of the body which prevent against water penetration. The required installation space for this strategy already exists and can be considered for the package of next generation vehicles.
- Full Text:
- Date Issued: 2009
Predictability of Geomagnetically Induced Currents using neural networks
- Authors: Lotz, Stefan
- Date: 2009
- Subjects: Advanced Composition Explorer (Artificial satellite) , Geomagnetism , Electromagnetic induction , Neural networks (Computer science) , Artificial intelligence
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5483 , http://hdl.handle.net/10962/d1005269 , Advanced Composition Explorer (Artificial satellite) , Geomagnetism , Electromagnetic induction , Neural networks (Computer science) , Artificial intelligence
- Description: It is a well documented fact that Geomagnetically Induced Currents (GIC’s) poses a significant threat to ground-based electric conductor networks like oil pipelines, railways and powerline networks. A study is undertaken to determine the feasibility of using artificial neural network models to predict GIC occurrence in the Southern African power grid. The magnitude of an induced current at a specific location on the Earth’s surface is directly related to the temporal derivative of the geomagnetic field (specifically its horizontal components) at that point. Hence, the focus of the problem is on the prediction of the temporal variations in the horizontal geomagnetic field (@Bx/@t and @By/@t). Artificial neural networks are used to predict @Bx/@t and @By/@t measured at Hermanus, South Africa (34.27◦ S, 19.12◦ E) with a 30 minute prediction lead time. As input parameters to the neural networks, insitu solar wind measurements made by the Advanced Composition Explorer (ACE) satellite are used. The results presented here compare well with similar models developed at high-latitude locations (e.g. Sweden, Finland, Canada) where extensive GIC research has been undertaken. It is concluded that it would indeed be feasible to use a neural network model to predict GIC occurrence in the Southern African power grid, provided that GIC measurements, powerline configuration and network parameters are made available.
- Full Text:
- Date Issued: 2009
- Authors: Lotz, Stefan
- Date: 2009
- Subjects: Advanced Composition Explorer (Artificial satellite) , Geomagnetism , Electromagnetic induction , Neural networks (Computer science) , Artificial intelligence
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5483 , http://hdl.handle.net/10962/d1005269 , Advanced Composition Explorer (Artificial satellite) , Geomagnetism , Electromagnetic induction , Neural networks (Computer science) , Artificial intelligence
- Description: It is a well documented fact that Geomagnetically Induced Currents (GIC’s) poses a significant threat to ground-based electric conductor networks like oil pipelines, railways and powerline networks. A study is undertaken to determine the feasibility of using artificial neural network models to predict GIC occurrence in the Southern African power grid. The magnitude of an induced current at a specific location on the Earth’s surface is directly related to the temporal derivative of the geomagnetic field (specifically its horizontal components) at that point. Hence, the focus of the problem is on the prediction of the temporal variations in the horizontal geomagnetic field (@Bx/@t and @By/@t). Artificial neural networks are used to predict @Bx/@t and @By/@t measured at Hermanus, South Africa (34.27◦ S, 19.12◦ E) with a 30 minute prediction lead time. As input parameters to the neural networks, insitu solar wind measurements made by the Advanced Composition Explorer (ACE) satellite are used. The results presented here compare well with similar models developed at high-latitude locations (e.g. Sweden, Finland, Canada) where extensive GIC research has been undertaken. It is concluded that it would indeed be feasible to use a neural network model to predict GIC occurrence in the Southern African power grid, provided that GIC measurements, powerline configuration and network parameters are made available.
- Full Text:
- Date Issued: 2009
Preservation or exploitation? : a study of the development of the mining rights legislation on the Witwatersrand goldfields from 1886 to 2008
- Authors: Stott, Joan
- Date: 2009
- Subjects: Ostrom, Elinor Chamber of Mines of South Africa Gold mines and mining -- South Africa -- Witwatersrand -- History Mineral industries -- Finance -- South Africa Mining law -- South Africa
- Language: English
- Type: Thesis , Masters , MEcon
- Identifier: vital:988 , http://hdl.handle.net/10962/d1002723
- Description: Elinor Ostrom (2005: 238) assumes that in understanding the make up and behaviour of institutional systems governing natural resources: “Resource users are explicitly thought of as rational egoists who plunder local resources so as to maximise their own short-term benefits. Government officials are implicitly depicted, on the other hand, as seeking, the more general public interest, having the relevant information at hand and the capability of designing optimal policies.” This thesis examines the validity of this assumption through an historical analysis of the deep-level gold mining industry of the Witwatersrand, South Africa. The main focus of the assessment is on the institutions of ownership – that is, the development of mining rights and title legislation between 1886 and 2008. The study looks at the legislations’ transformation and implementation from the perspective of the gold mining industry – made up of the mining finance houses and the Chamber of Mines of South Africa – and that of the state. The transformation of the mining industry’s institutional framework was both a choice by government as well as that of the firms in the mining industry. The theoretical framework is constructed from four areas of economic thought. These include: the neoclassical and Keynesian schools of macroeconomic thought; industrial organisation and its relevance to the relationship between firms and the market; institutional and new institutional economics; and finally property rights. The determinants of policy design and the impact of such design on firms and industry is examined. The development, implementation and use of the aforementioned legislation is examined from two perspectives, namely, that of preserver or exploiter. Throughout the history of this prominent South African industry, the motivation for action from the industry or government has oscillated between the two extremes of preserver or exploiter over the time period examined. The conclusion is drawn on an overall and broad focus of actions – with a strong focus on the most recent developments in mining legislation – post-1992.
- Full Text:
- Date Issued: 2009
- Authors: Stott, Joan
- Date: 2009
- Subjects: Ostrom, Elinor Chamber of Mines of South Africa Gold mines and mining -- South Africa -- Witwatersrand -- History Mineral industries -- Finance -- South Africa Mining law -- South Africa
- Language: English
- Type: Thesis , Masters , MEcon
- Identifier: vital:988 , http://hdl.handle.net/10962/d1002723
- Description: Elinor Ostrom (2005: 238) assumes that in understanding the make up and behaviour of institutional systems governing natural resources: “Resource users are explicitly thought of as rational egoists who plunder local resources so as to maximise their own short-term benefits. Government officials are implicitly depicted, on the other hand, as seeking, the more general public interest, having the relevant information at hand and the capability of designing optimal policies.” This thesis examines the validity of this assumption through an historical analysis of the deep-level gold mining industry of the Witwatersrand, South Africa. The main focus of the assessment is on the institutions of ownership – that is, the development of mining rights and title legislation between 1886 and 2008. The study looks at the legislations’ transformation and implementation from the perspective of the gold mining industry – made up of the mining finance houses and the Chamber of Mines of South Africa – and that of the state. The transformation of the mining industry’s institutional framework was both a choice by government as well as that of the firms in the mining industry. The theoretical framework is constructed from four areas of economic thought. These include: the neoclassical and Keynesian schools of macroeconomic thought; industrial organisation and its relevance to the relationship between firms and the market; institutional and new institutional economics; and finally property rights. The determinants of policy design and the impact of such design on firms and industry is examined. The development, implementation and use of the aforementioned legislation is examined from two perspectives, namely, that of preserver or exploiter. Throughout the history of this prominent South African industry, the motivation for action from the industry or government has oscillated between the two extremes of preserver or exploiter over the time period examined. The conclusion is drawn on an overall and broad focus of actions – with a strong focus on the most recent developments in mining legislation – post-1992.
- Full Text:
- Date Issued: 2009
Principals' interpretation of their role in implementing the national curriculum statement : a study of three KZN Vryheid principals
- Msane, Sikhumbuzo Goodenough
- Authors: Msane, Sikhumbuzo Goodenough
- Date: 2009
- Subjects: Curriculum planning -- South Africa -- KwaZulu-Natal , Teacher participation in curriculum planning , Educational change -- South Africa -- KwaZulu-Natal , Education -- South Africa -- Curricula
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9511 , http://hdl.handle.net/10948/1133 , Curriculum planning -- South Africa -- KwaZulu-Natal , Teacher participation in curriculum planning , Educational change -- South Africa -- KwaZulu-Natal , Education -- South Africa -- Curricula
- Description: Principals were struggling with the interpretation of their roles in the implementation of the NCS in South African schools, parlty due to the huge change and complexity of the NCS. It was found that principals did not understand their roles in the implementation of the NCS, and as a result did not develop staff, were not familiar with the roles of educators as specified by policy and shifted the burden of developing educators to the Department of Education. A qualitative research approach was employed. A reputational case sampling was conducted on three secondary school principals in the KZN Vryheid District. A semi structured interview and a semi-structured questionaire were employed on these three principals to gather data. Theme analysis was used to determine how principals interpreted their roles in the implementation of the NCS. I found that principals did not have enough understanding of their roles in the implementation of the NCS. However, principals complained that the Department of Education was more concerned about expanding access to education than quality of education. They also lamented that teachers had a low self- esteem with the profession. I found that principals required detailed workshops on their roles in the implementation of the NCS, ongoing curriculum leadership training, and required LTSM resources and equipped laboratories.
- Full Text:
- Date Issued: 2009
- Authors: Msane, Sikhumbuzo Goodenough
- Date: 2009
- Subjects: Curriculum planning -- South Africa -- KwaZulu-Natal , Teacher participation in curriculum planning , Educational change -- South Africa -- KwaZulu-Natal , Education -- South Africa -- Curricula
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9511 , http://hdl.handle.net/10948/1133 , Curriculum planning -- South Africa -- KwaZulu-Natal , Teacher participation in curriculum planning , Educational change -- South Africa -- KwaZulu-Natal , Education -- South Africa -- Curricula
- Description: Principals were struggling with the interpretation of their roles in the implementation of the NCS in South African schools, parlty due to the huge change and complexity of the NCS. It was found that principals did not understand their roles in the implementation of the NCS, and as a result did not develop staff, were not familiar with the roles of educators as specified by policy and shifted the burden of developing educators to the Department of Education. A qualitative research approach was employed. A reputational case sampling was conducted on three secondary school principals in the KZN Vryheid District. A semi structured interview and a semi-structured questionaire were employed on these three principals to gather data. Theme analysis was used to determine how principals interpreted their roles in the implementation of the NCS. I found that principals did not have enough understanding of their roles in the implementation of the NCS. However, principals complained that the Department of Education was more concerned about expanding access to education than quality of education. They also lamented that teachers had a low self- esteem with the profession. I found that principals required detailed workshops on their roles in the implementation of the NCS, ongoing curriculum leadership training, and required LTSM resources and equipped laboratories.
- Full Text:
- Date Issued: 2009