A study of the kinetics of a high temperature thermoluminescence peak in annealed natural quartz
- Thomas, Sunil, Chithambo, Makaiko L
- Authors: Thomas, Sunil , Chithambo, Makaiko L
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/110007 , vital:33213 , DOI: 10.1016/j.jlumin.2018.08.077
- Description: Thermoluminescence of a high temperature secondary glow-peak in natural quartz annealed at 900 °C is reported. The glow-curve of a sample irradiated to 10 Gy and measured at 1 °C/s shows three peaks; the main peak at 71 °C and two other weaker-intensity peaks at 125 °C and 177 °C. For reference, the peaks are labelled as I, II and III. This study is concerned with the secondary peak at 177 °C (peak III). The electron trap responsible for peak III is stable at ambient temperature as determined by monitoring the peak intensity after various delays between irradiation and measurement. The activation energy and frequency factor of the peak were estimated as ~1.24 eV and ~10¹² s⁻¹ respectively. The dose response of the peak in the range 1–300 Gy is sublinear. The influence of either partial heating or irradiation dose on the peak position suggest that the peak follows non-first-order kinetics.
- Full Text: false
- Date Issued: 2018
- Authors: Thomas, Sunil , Chithambo, Makaiko L
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/110007 , vital:33213 , DOI: 10.1016/j.jlumin.2018.08.077
- Description: Thermoluminescence of a high temperature secondary glow-peak in natural quartz annealed at 900 °C is reported. The glow-curve of a sample irradiated to 10 Gy and measured at 1 °C/s shows three peaks; the main peak at 71 °C and two other weaker-intensity peaks at 125 °C and 177 °C. For reference, the peaks are labelled as I, II and III. This study is concerned with the secondary peak at 177 °C (peak III). The electron trap responsible for peak III is stable at ambient temperature as determined by monitoring the peak intensity after various delays between irradiation and measurement. The activation energy and frequency factor of the peak were estimated as ~1.24 eV and ~10¹² s⁻¹ respectively. The dose response of the peak in the range 1–300 Gy is sublinear. The influence of either partial heating or irradiation dose on the peak position suggest that the peak follows non-first-order kinetics.
- Full Text: false
- Date Issued: 2018
A study on the creative industry as a pillar of sustained growth and diversification: the film and music sectors in Jamaica: lessons from case studies of successful firms and ventures
- Hendrickson, Michael, Stanley Niaah, Sonjah
- Authors: Hendrickson, Michael , Stanley Niaah, Sonjah
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146992 , vital:38583 , https://repositorio.cepal.org/handle/11362/43410
- Description: In 2007 the Caribbean Community (CARICOM) published ‘The Cultural Industries in CARICOM: Trade and Development Challenges’ report, which stated that the film and music industries refer to “aesthetic, identity, and copyrightable goods, services and intellectual property. They represent a wide array of activities that make and circulate sounds, words, and images or a combination of these. It applies to artistic, creative, and copyright works that are for sale, license, commercialisation, or display in some marketplace or public arena.” Using the definition in the CARICOM report, this study will identify the critical success factors that have resulted in the global competitiveness and sustainability of individuals, firms and ventures within the music and film subsectors in Jamaica. To anchor the study of the individual firms and ventures, the study first evaluates the historical evolution and recent trends in the development of the music and film subsectors, including their economic contribution and the main challenges and opportunities for their further development and lessons learned.
- Full Text:
- Date Issued: 2018
- Authors: Hendrickson, Michael , Stanley Niaah, Sonjah
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146992 , vital:38583 , https://repositorio.cepal.org/handle/11362/43410
- Description: In 2007 the Caribbean Community (CARICOM) published ‘The Cultural Industries in CARICOM: Trade and Development Challenges’ report, which stated that the film and music industries refer to “aesthetic, identity, and copyrightable goods, services and intellectual property. They represent a wide array of activities that make and circulate sounds, words, and images or a combination of these. It applies to artistic, creative, and copyright works that are for sale, license, commercialisation, or display in some marketplace or public arena.” Using the definition in the CARICOM report, this study will identify the critical success factors that have resulted in the global competitiveness and sustainability of individuals, firms and ventures within the music and film subsectors in Jamaica. To anchor the study of the individual firms and ventures, the study first evaluates the historical evolution and recent trends in the development of the music and film subsectors, including their economic contribution and the main challenges and opportunities for their further development and lessons learned.
- Full Text:
- Date Issued: 2018
A survey of organizational culture and organizational performance in a manufacturing company
- Authors: Dom, Veliswa Virginia
- Date: 2018
- Subjects: Corporate culture -- South Africa -- Eastern Cape , Organizational behavior -- South Africa -- Eastern Cape , Factories -- South Africa -- Eastern Cape , Analysis of variance , Shift systems -- South Africa -- Eastern Cape , Employees -- Rating of -- South Africa -- Eastern Cape , Competing Values Framework (CVF)
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/61861 , vital:28069
- Description: The purpose of this research was to explore the relationship between organizational culture and organizational performance in a manufacturing company. This company supplies metal products to the motor vehicle manufacturing industry, where the quality and quantity of parts produced is of paramount importance, since the buyers of these products are quality conscious. The organization has three production shifts that rotate each week. Anecdotal observations are that irrespective of the time that a shift operates over the course of the month, the different shifts tend to perform at different levels in terms of quality and quantity of output. This study therefore sought to investigate if these differences between shifts are statistically significant, and if so, whether these shifts also have differences in organizational culture. Components of organizational culture include values, norms, beliefs, attitudes, principles and expectations that give the organization a unique personality and differentiate it from other organizations. While the literature indicates that qualitative or quantitative approaches can be used in organizational culture research, this research adopted the quantitative approach, making use of the Competing Values Framework (CVF). The CVF is a four-category organizational culture typology established by Cameron and Quinn (2006). The framework is based on two dimensions: stability or flexibility of the organization, and external or internal focus. In this research, the CVF was used as a measurement tool to evaluate organizational culture. In order to determine differences in organizational culture between shifts, a survey was undertaken (N=138) which measured employee perceptions pertaining to the existing organizational culture of each of the three production shifts at the company. Secondly, differences in performance between the shifts were examined by using the performance data for a three-month period for each shift in terms of quantity and quality. This data was obtained from the management of the production process at the company. Statistical analysis was done using ANOVA to analyse the differences between the shifts. The findings indicated that the dominant existing organizational culture at the company under investigation is a clan culture. Furthermore, there is a statistically significant difference between the cultures of all the three shifts at the manufacturing company. The results also indicated that there is a statistically significant difference in the quantity and quality of production between the three shifts. In conclusion, the research indicated there are differences in culture and in performance, but given the nature of the data, it was not possible to statistically analyse the relationship between shift culture and performance. However, it is conceivable that cultural differences between shifts may be contributing to performance differences. With regards to further research, it is recommended that this research be extended to other branches of the manufacturing company in other regions, in order to determine whether there are any significant differences in culture and performance between these branches and their shifts. Research could also be extended to other South African organizations to create a sufficiently large sample of shift and/or business units, so as to be able to do statistical analysis of the relationship between culture and performance.
- Full Text:
- Date Issued: 2018
- Authors: Dom, Veliswa Virginia
- Date: 2018
- Subjects: Corporate culture -- South Africa -- Eastern Cape , Organizational behavior -- South Africa -- Eastern Cape , Factories -- South Africa -- Eastern Cape , Analysis of variance , Shift systems -- South Africa -- Eastern Cape , Employees -- Rating of -- South Africa -- Eastern Cape , Competing Values Framework (CVF)
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/61861 , vital:28069
- Description: The purpose of this research was to explore the relationship between organizational culture and organizational performance in a manufacturing company. This company supplies metal products to the motor vehicle manufacturing industry, where the quality and quantity of parts produced is of paramount importance, since the buyers of these products are quality conscious. The organization has three production shifts that rotate each week. Anecdotal observations are that irrespective of the time that a shift operates over the course of the month, the different shifts tend to perform at different levels in terms of quality and quantity of output. This study therefore sought to investigate if these differences between shifts are statistically significant, and if so, whether these shifts also have differences in organizational culture. Components of organizational culture include values, norms, beliefs, attitudes, principles and expectations that give the organization a unique personality and differentiate it from other organizations. While the literature indicates that qualitative or quantitative approaches can be used in organizational culture research, this research adopted the quantitative approach, making use of the Competing Values Framework (CVF). The CVF is a four-category organizational culture typology established by Cameron and Quinn (2006). The framework is based on two dimensions: stability or flexibility of the organization, and external or internal focus. In this research, the CVF was used as a measurement tool to evaluate organizational culture. In order to determine differences in organizational culture between shifts, a survey was undertaken (N=138) which measured employee perceptions pertaining to the existing organizational culture of each of the three production shifts at the company. Secondly, differences in performance between the shifts were examined by using the performance data for a three-month period for each shift in terms of quantity and quality. This data was obtained from the management of the production process at the company. Statistical analysis was done using ANOVA to analyse the differences between the shifts. The findings indicated that the dominant existing organizational culture at the company under investigation is a clan culture. Furthermore, there is a statistically significant difference between the cultures of all the three shifts at the manufacturing company. The results also indicated that there is a statistically significant difference in the quantity and quality of production between the three shifts. In conclusion, the research indicated there are differences in culture and in performance, but given the nature of the data, it was not possible to statistically analyse the relationship between shift culture and performance. However, it is conceivable that cultural differences between shifts may be contributing to performance differences. With regards to further research, it is recommended that this research be extended to other branches of the manufacturing company in other regions, in order to determine whether there are any significant differences in culture and performance between these branches and their shifts. Research could also be extended to other South African organizations to create a sufficiently large sample of shift and/or business units, so as to be able to do statistical analysis of the relationship between culture and performance.
- Full Text:
- Date Issued: 2018
A systematic review of intervention effectiveness for problem anger in an adult outpatient population
- Authors: von Ruben, Adriana
- Date: 2018
- Subjects: Anger , Anger -- Treatment , Rational emotive behavior therapy , Personality assessment , Social psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/36059 , vital:33886
- Description: Increasing levels of anger are becoming one of the major social problems of modern society, yet anger is one of the least understood emotions. Given the long-term consequences and the seriousness of the negative outcomes associated with anger, there is a pressing need for effective anger management interventions targeted at different populations experiencing various types of problem anger.The purpose of this dissertation was to conduct a systematic review of current qualitative and quantitative research regarding the status of anger reducing interventions within outpatient populations. The aim was to explore the efficacy of various psychological approaches utilised to reduce problem anger. Eligibility criteria included studies with samples that had problem anger defined psychometrically. The search of available literature revealed 16 relevant reports containing 15 studies. All located studies utilised intervention modalities derived from cognitive and behavioural approaches. Results indicated large to moderate improvements in problem anger for the participants receiving the treatment. Cognitive and behavioural anger interventions were found to produce reductions in trait anger, general anger, the negative expression and suppression of anger, anger related physiological arousal, and increased the positive, controlled anger experience. More large-scale studies are needed implementing other psychological approaches to test their effectiveness in reducing maladaptive anger. The dearth of anger research conducted within outpatient populations is discussed in the context of the emerged themes.
- Full Text:
- Date Issued: 2018
- Authors: von Ruben, Adriana
- Date: 2018
- Subjects: Anger , Anger -- Treatment , Rational emotive behavior therapy , Personality assessment , Social psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/36059 , vital:33886
- Description: Increasing levels of anger are becoming one of the major social problems of modern society, yet anger is one of the least understood emotions. Given the long-term consequences and the seriousness of the negative outcomes associated with anger, there is a pressing need for effective anger management interventions targeted at different populations experiencing various types of problem anger.The purpose of this dissertation was to conduct a systematic review of current qualitative and quantitative research regarding the status of anger reducing interventions within outpatient populations. The aim was to explore the efficacy of various psychological approaches utilised to reduce problem anger. Eligibility criteria included studies with samples that had problem anger defined psychometrically. The search of available literature revealed 16 relevant reports containing 15 studies. All located studies utilised intervention modalities derived from cognitive and behavioural approaches. Results indicated large to moderate improvements in problem anger for the participants receiving the treatment. Cognitive and behavioural anger interventions were found to produce reductions in trait anger, general anger, the negative expression and suppression of anger, anger related physiological arousal, and increased the positive, controlled anger experience. More large-scale studies are needed implementing other psychological approaches to test their effectiveness in reducing maladaptive anger. The dearth of anger research conducted within outpatient populations is discussed in the context of the emerged themes.
- Full Text:
- Date Issued: 2018
A thematic analysis of the challenges experienced by those living with tuberculosis
- Authors: Walaza, Robert Letsholo
- Date: 2018
- Subjects: Tuberculosis Patients South Africa , Tuberculosis Social aspects , South Africa Social conditions , Poor Health and hygiene South Africa , Poor Medical care South Africa , Social medicine South Africa
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/61850 , vital:28068
- Description: Friedrich Engels (1820-1895) in his study, The condition of the working class in England, argued that the cause of illness and death amongst the working class was due to their living conditions such as poor housing, over-crowding, poor sanitation, food shortage, low paying jobs and a lack of material resources. The objective of the study was to understand the experiences of six South African individuals who have shared their experiences and challenges of living with TB on the TB&ME blog, and to show how TB is linked to the living conditions of these individuals. The study found that the challenges experienced by TB patient bloggers are of a social nature and confirms Engel’s study findings on the conditions of the working class in England. For example, a disease such as TB has a direct association with the living conditions of people, especially the poor. Thus, socio economic status of TB patient bloggers plays a role in the escalation of their ill health. Further, the study found that gender is central in understanding non-compliance to treatment. This is significant as it highlights the need to not only focus on issues of socioeconomics, but gender issues in fighting TB. Despite the negative consequences associated with living with TB, the bloggers have noted that the support from loved ones and other stakeholders in the fight against TB alleviates the challenges inherent in living with TB.
- Full Text:
- Date Issued: 2018
- Authors: Walaza, Robert Letsholo
- Date: 2018
- Subjects: Tuberculosis Patients South Africa , Tuberculosis Social aspects , South Africa Social conditions , Poor Health and hygiene South Africa , Poor Medical care South Africa , Social medicine South Africa
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/61850 , vital:28068
- Description: Friedrich Engels (1820-1895) in his study, The condition of the working class in England, argued that the cause of illness and death amongst the working class was due to their living conditions such as poor housing, over-crowding, poor sanitation, food shortage, low paying jobs and a lack of material resources. The objective of the study was to understand the experiences of six South African individuals who have shared their experiences and challenges of living with TB on the TB&ME blog, and to show how TB is linked to the living conditions of these individuals. The study found that the challenges experienced by TB patient bloggers are of a social nature and confirms Engel’s study findings on the conditions of the working class in England. For example, a disease such as TB has a direct association with the living conditions of people, especially the poor. Thus, socio economic status of TB patient bloggers plays a role in the escalation of their ill health. Further, the study found that gender is central in understanding non-compliance to treatment. This is significant as it highlights the need to not only focus on issues of socioeconomics, but gender issues in fighting TB. Despite the negative consequences associated with living with TB, the bloggers have noted that the support from loved ones and other stakeholders in the fight against TB alleviates the challenges inherent in living with TB.
- Full Text:
- Date Issued: 2018
A theoretical study on primary health care services within a South African context
- Mkalipi, Thembinkosi Delport
- Authors: Mkalipi, Thembinkosi Delport
- Date: 2018
- Subjects: Primary health care -- South Africa , Health facilities -- South Africa Clinics -- South Africa
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10948/32193 , vital:31979
- Description: Primary health care (PHC) is a system introduced to bring health services closer to communities. It was introduced with its challenges such as the management and treatment of various illnesses including HIV, TB and STI’s which have affected certain communities. The non-communicable diseases which require the attention of PHC institutions still face numerous challenges including the referral system and clinics with limited medicine. The study revealed that there are limited measures in place to deal with communities in rural areas who require medical assistance from government. Further challenges identified from the study included human resource management, supply chain management, finance and other administrative support systems. The inadequate funding of the Department of Health appears to be directly related to adequate service delivery problems. The study adopted a qualitative research methodology which incorporated an extensive desktop analysis and literature review approach. No human participants were involved. Health legislation is an important enabler and a necessary component of health policy. Research has shown that since 1995 when the first edition of the review appeared, South Africa has been engaged in a constant process of public health law reform and despite significant gains, some legislative processes have stalled. Examples include the certificate of need provided for in the National Health Act, the introduction of compulsory continuing professional development for pharmacists, the recognition of specialist nurses as prescribers, and the introduction of international benchmarking for medicinal processes. The process of introducing NHI remains contested with the legislative component, still under developed. Although NHI will in due course be a game changer and there has been some strengthening of the health service in the NHI pilot district to date, in general, implementation has been slower than anticipated in the NHI green paper released in August 2011. The NHI white paper indicated that public health care spending was likely to increase substantially over the next 15years from 4% to 6% of the GDP. Several mechanisms for raising revenue have been proposed, including some combination of an increase of VAT or payroll tax, or an increase of personal income tax. NHI also has the potential to improve efficiencies in the overall health system through improved pooling, strategic purchasing, medicine price reduction through central procurement, redistribution, improved quality in the public sector and providing greater access to general practitioners. Development of, and amendment to the relevant health technology assessment policy and legislative frameworks are needed in order to inform appropriate universal health coverage and to align with the 2015 NHI white paper Addressing social determinants is the cornerstone of the National Department of Health’s primary health care system. A engineering strategy, and an approach that is embedded in the country’s national development plan is needed. However the translation of this policy commitment to programmatic action at different levels in the health system and in partnership with other sectors remains elusive Evidence indicate that South African patients face challenges in accessing heath care particularly those from rural areas. The main challenge is the lack of a coordinated strategy to ensure continuous access to treatment, cure and support for chronic conditions. This study has shown that the private for profit hospital sector is well resourced and caters to a population that is wealthier, urban and more likely to be formerly employed. The public hospital sector catering to the majority of South Africans, faces lower human resourcing ratios, financial constraints and ageing infrastructure. The ideal clinic realisation and maintenance programme was assigned in response to the current deficiencies in the quality of primary health care services and to lay a strong foundation for the implementation of national health insurance. There is an urgent need to develop cohesive, sustainable systems to support evidence based decisions on appropriate regime choices, while minimizing risks associated with medication. This study has shown the importance of a robust national PV system in order to reduce the significant burden of drug induced diseases, to inform treatment policies with real world evidence, to improve outcomes of common diseases, such as HIV, TB, hypertension, and diabetes through optimal therapeutic management, and to ensure the safety of large scale therapeutic interventions such as vaccines, especially when newly introduced. Results from the study suggest that there is a failure by policy-makers to adequately address the challenges faced by PHC institutions. There also appears to be a backlog in terms of the promulgation of enabling legislation to address certain of the challenges. The Department of Health has a number of draft policies which are negatively affecting the level of service delivery. The study revealed that the challenges include, inter alia, inadequate budgeting, staff shortages, aging infrastructure, the non-availability of certain medicines in hospitals, a poor referral system with limited measures in place to address HIV, TB and STI’s as well as non-communicable treatments.
- Full Text:
- Date Issued: 2018
- Authors: Mkalipi, Thembinkosi Delport
- Date: 2018
- Subjects: Primary health care -- South Africa , Health facilities -- South Africa Clinics -- South Africa
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10948/32193 , vital:31979
- Description: Primary health care (PHC) is a system introduced to bring health services closer to communities. It was introduced with its challenges such as the management and treatment of various illnesses including HIV, TB and STI’s which have affected certain communities. The non-communicable diseases which require the attention of PHC institutions still face numerous challenges including the referral system and clinics with limited medicine. The study revealed that there are limited measures in place to deal with communities in rural areas who require medical assistance from government. Further challenges identified from the study included human resource management, supply chain management, finance and other administrative support systems. The inadequate funding of the Department of Health appears to be directly related to adequate service delivery problems. The study adopted a qualitative research methodology which incorporated an extensive desktop analysis and literature review approach. No human participants were involved. Health legislation is an important enabler and a necessary component of health policy. Research has shown that since 1995 when the first edition of the review appeared, South Africa has been engaged in a constant process of public health law reform and despite significant gains, some legislative processes have stalled. Examples include the certificate of need provided for in the National Health Act, the introduction of compulsory continuing professional development for pharmacists, the recognition of specialist nurses as prescribers, and the introduction of international benchmarking for medicinal processes. The process of introducing NHI remains contested with the legislative component, still under developed. Although NHI will in due course be a game changer and there has been some strengthening of the health service in the NHI pilot district to date, in general, implementation has been slower than anticipated in the NHI green paper released in August 2011. The NHI white paper indicated that public health care spending was likely to increase substantially over the next 15years from 4% to 6% of the GDP. Several mechanisms for raising revenue have been proposed, including some combination of an increase of VAT or payroll tax, or an increase of personal income tax. NHI also has the potential to improve efficiencies in the overall health system through improved pooling, strategic purchasing, medicine price reduction through central procurement, redistribution, improved quality in the public sector and providing greater access to general practitioners. Development of, and amendment to the relevant health technology assessment policy and legislative frameworks are needed in order to inform appropriate universal health coverage and to align with the 2015 NHI white paper Addressing social determinants is the cornerstone of the National Department of Health’s primary health care system. A engineering strategy, and an approach that is embedded in the country’s national development plan is needed. However the translation of this policy commitment to programmatic action at different levels in the health system and in partnership with other sectors remains elusive Evidence indicate that South African patients face challenges in accessing heath care particularly those from rural areas. The main challenge is the lack of a coordinated strategy to ensure continuous access to treatment, cure and support for chronic conditions. This study has shown that the private for profit hospital sector is well resourced and caters to a population that is wealthier, urban and more likely to be formerly employed. The public hospital sector catering to the majority of South Africans, faces lower human resourcing ratios, financial constraints and ageing infrastructure. The ideal clinic realisation and maintenance programme was assigned in response to the current deficiencies in the quality of primary health care services and to lay a strong foundation for the implementation of national health insurance. There is an urgent need to develop cohesive, sustainable systems to support evidence based decisions on appropriate regime choices, while minimizing risks associated with medication. This study has shown the importance of a robust national PV system in order to reduce the significant burden of drug induced diseases, to inform treatment policies with real world evidence, to improve outcomes of common diseases, such as HIV, TB, hypertension, and diabetes through optimal therapeutic management, and to ensure the safety of large scale therapeutic interventions such as vaccines, especially when newly introduced. Results from the study suggest that there is a failure by policy-makers to adequately address the challenges faced by PHC institutions. There also appears to be a backlog in terms of the promulgation of enabling legislation to address certain of the challenges. The Department of Health has a number of draft policies which are negatively affecting the level of service delivery. The study revealed that the challenges include, inter alia, inadequate budgeting, staff shortages, aging infrastructure, the non-availability of certain medicines in hospitals, a poor referral system with limited measures in place to address HIV, TB and STI’s as well as non-communicable treatments.
- Full Text:
- Date Issued: 2018
A trend analysis of perinatal mortalities in Barberton Hospital between 2002 and 2016
- Modupe, Oluwarotimi Folorunsho
- Authors: Modupe, Oluwarotimi Folorunsho
- Date: 2018
- Subjects: Newborn infants -- Mortality Perinatology
- Language: English
- Type: Thesis , Masters , MPH
- Identifier: http://hdl.handle.net/10353/11254 , vital:37630
- Description: Background and aim: There is no doubt that the quantification of data on the new born is imperative towards the design of effective public health policy interventions. However, the trend in under-five mortality rates in Barberton Hospital is not recognised as no empirical investigation has been undertaken to ascertain its position in this regard. A trend analysis of infant and maternal deaths in will therefore shed light on possible factors influencing this trend. The specific objectives of this study were to examine the trend and causes of perinatal mortality in Barberton Hospital from 2002-2016. It was hypothesized that there would be a downward trend in the infant and maternal mortality rates in Barberton Hospital from 2002-2016, possibly as a result of improved medical care. Methods: This retrospective study was conducted in Barberton Hospital, located in the Umjindi sub-district in Mpumalanga Province. The data was drawn from the Perinatal Problem Identification Programme (PPIP) database. Pregnancy related deaths of women, and of children from birth to one year in Barberton Hospital from 1999-2014 were extracted. The population study consists of a record review of all infant and maternal deaths in Barberton Hospital from 2002-2016 and captured in the data on the PPIP. The University of Fort Hare ethical review committee approved the study protocol. In addition, permission to use the data was granted by the Mpumalanga Department of Health after applying for approval for use of the data for academic purposes. The data was then exported into an Excel format document and fed to Statistical Package for Social Sciences (SPSS) program to allow for a more detailed analysis. Results: Over the period under review (2002-2016), a total of 21151 babies were delivered, 20593 babies were alive at discharge, 221 babies died in the first 28 days of delivery, and 337 babies were stillbirths. 18577 were normal weight (≥2500gram), 1581 weighed 2000-2499 grams, 568 weighed 1500-1999grams, 286 weighed 1000-1499 and 139 weighed below 1000grams. All the women who gave birth over the period under review, 27.3percent tested positive to HIV, 40.3 percent tested negative. Of all women that tested positive, 80.2percent received any form of ART. For over half of women that received ART (n=2981), the type of ART they received is unknown. Most women whose baby died were young. One in five women did not have their age captured in the database indicating an important gap that need to be addressed in order to ensure integrity of the database. Of all the 558 perinatal mortality, 75.3 weighed below 2500 grams. Low birth weight is major risk factor for child mortality. Babies weighing less than 2,500 grams are 20 times more likely to die than heavier babies. For all the perinatal deaths, the majority of their mothers received antenatal care services. About 86.6percent were delivered at Barberton Hospital and only 1 child was delivered in transit to the hospital. Of all the 558 deaths, only 7.5 percent was multiple births. Of the 558 babies that died, only 39.6percent were born alive, 37.1percent was macerated stillbirths. The syphilis serology test indicated that most mothers tested negative. The HIV serology test indicated that 28percent of mothers tested positive. The hospital recorded a total of 337 stillbirths between 2002 and 2016. This accounts for 60.2percent of all perinatal mortality over the period. Of all stillbirths, 61.6percent was macerated stillbirths. Yearly analysis of stillbirth rate did not clearly indicate whether stillbirth rate is increasing or declining. Not less than 56 primary obstetric causes of perinatal deaths were identified in this study. Many perinatal deaths were unexplainable due to lack of post-mortem. Idiopathic preterm labour was the main primary obstetric cause of early (34.5percent) and late neonatal (38.9percent) deaths, and the next was labour related intrapartum asphyxia. Labour related intrapartum asphyxia also accounts for 6.8percent of all stillbirths. The main known primary obstetric cause of stillbirth in the Hospital was Proteinuric hypertension/hypertension disorders. Over 60percent of perinatal mortality in Barberton Hospital was due to associated maternal conditions. Only 10.9percent was due to fetal related conditions and 26.4percent was unexplained. Few deaths were due to health system failure and domestic violence. Spontaneous preterm labour (18.4percent), abnormal labour or uterine rupture (14.5percent), maternal hypertension (12.4percent), antepartum haemorrhage (10.2percent) were the main associated maternal conditions causes of perinatal mortality in Barberton Hospital. Similarly, Fetal abnormality and infections were the main associated fetal condition causes of perinatal mortality. Of all the babies that were alive at birth, 85.2percent died due to maternal related conditions. Most neonates died due to spontaneous preterm labour (43.5percent) and abnormal labour or uterine rupture (23.1percent). Maternal HIV, diabetics and syphilis only accounted for a few neonatal deaths. For stillbirth babies that were alive at admission, abnormal labour or uterine rupture (33.1percent) and antepartum haemorrhage (19.7percent) were the main causes of their death. Over 60percent of all of macerated deaths have unexplained causes. Maternal hypertension is the main known cause of macerated stillbirth. For stillbirths that were dead on admission, maternal hypertension (13.1percent), antepartum haemorrhage (26.2percent) and abnormal labour or uterine rupture were the main causes of deaths. The majority of perinatal deaths in the hospital were caused by intrauterine deaths (58.8percent). Extreme multi-organ immaturity (13.1percent), Hyaline membrane disease (7.2percent) and Hypoxic ischaemic encephalopathy (5.2percent) were among the main final causes of perinatal deaths. The main behavioural factor causing perinatal mortality in Mpumalanga province was non-use of antenatal care services. The majority of perinatal mortality (60.4percent) was due to health system related causes. Most perinatal deaths were due to poor management of cases and delayed referral. Conclusion: The findings indicate that while stillbirths have slightly declined, neonatal deaths have not declined over the period. Perinatal have slightly declined in the hospital. The findings of this study also indicate that the majority of perinatal deaths in the hospital were caused by idiopathic preterm labour, unexplained intrauterine deaths, hypertension, and intrapartum asphyxia. Patient and health system related factors contributed significantly to perinatal deaths in the hospital. There is a need for yearly analysis of PPIP data to track progress and identify area for continuous improvement in provision of quality obstetric services. A greater community awareness of risk factors for perinatal deaths and importance of early and regular take up antenatal care services is needed.
- Full Text:
- Date Issued: 2018
- Authors: Modupe, Oluwarotimi Folorunsho
- Date: 2018
- Subjects: Newborn infants -- Mortality Perinatology
- Language: English
- Type: Thesis , Masters , MPH
- Identifier: http://hdl.handle.net/10353/11254 , vital:37630
- Description: Background and aim: There is no doubt that the quantification of data on the new born is imperative towards the design of effective public health policy interventions. However, the trend in under-five mortality rates in Barberton Hospital is not recognised as no empirical investigation has been undertaken to ascertain its position in this regard. A trend analysis of infant and maternal deaths in will therefore shed light on possible factors influencing this trend. The specific objectives of this study were to examine the trend and causes of perinatal mortality in Barberton Hospital from 2002-2016. It was hypothesized that there would be a downward trend in the infant and maternal mortality rates in Barberton Hospital from 2002-2016, possibly as a result of improved medical care. Methods: This retrospective study was conducted in Barberton Hospital, located in the Umjindi sub-district in Mpumalanga Province. The data was drawn from the Perinatal Problem Identification Programme (PPIP) database. Pregnancy related deaths of women, and of children from birth to one year in Barberton Hospital from 1999-2014 were extracted. The population study consists of a record review of all infant and maternal deaths in Barberton Hospital from 2002-2016 and captured in the data on the PPIP. The University of Fort Hare ethical review committee approved the study protocol. In addition, permission to use the data was granted by the Mpumalanga Department of Health after applying for approval for use of the data for academic purposes. The data was then exported into an Excel format document and fed to Statistical Package for Social Sciences (SPSS) program to allow for a more detailed analysis. Results: Over the period under review (2002-2016), a total of 21151 babies were delivered, 20593 babies were alive at discharge, 221 babies died in the first 28 days of delivery, and 337 babies were stillbirths. 18577 were normal weight (≥2500gram), 1581 weighed 2000-2499 grams, 568 weighed 1500-1999grams, 286 weighed 1000-1499 and 139 weighed below 1000grams. All the women who gave birth over the period under review, 27.3percent tested positive to HIV, 40.3 percent tested negative. Of all women that tested positive, 80.2percent received any form of ART. For over half of women that received ART (n=2981), the type of ART they received is unknown. Most women whose baby died were young. One in five women did not have their age captured in the database indicating an important gap that need to be addressed in order to ensure integrity of the database. Of all the 558 perinatal mortality, 75.3 weighed below 2500 grams. Low birth weight is major risk factor for child mortality. Babies weighing less than 2,500 grams are 20 times more likely to die than heavier babies. For all the perinatal deaths, the majority of their mothers received antenatal care services. About 86.6percent were delivered at Barberton Hospital and only 1 child was delivered in transit to the hospital. Of all the 558 deaths, only 7.5 percent was multiple births. Of the 558 babies that died, only 39.6percent were born alive, 37.1percent was macerated stillbirths. The syphilis serology test indicated that most mothers tested negative. The HIV serology test indicated that 28percent of mothers tested positive. The hospital recorded a total of 337 stillbirths between 2002 and 2016. This accounts for 60.2percent of all perinatal mortality over the period. Of all stillbirths, 61.6percent was macerated stillbirths. Yearly analysis of stillbirth rate did not clearly indicate whether stillbirth rate is increasing or declining. Not less than 56 primary obstetric causes of perinatal deaths were identified in this study. Many perinatal deaths were unexplainable due to lack of post-mortem. Idiopathic preterm labour was the main primary obstetric cause of early (34.5percent) and late neonatal (38.9percent) deaths, and the next was labour related intrapartum asphyxia. Labour related intrapartum asphyxia also accounts for 6.8percent of all stillbirths. The main known primary obstetric cause of stillbirth in the Hospital was Proteinuric hypertension/hypertension disorders. Over 60percent of perinatal mortality in Barberton Hospital was due to associated maternal conditions. Only 10.9percent was due to fetal related conditions and 26.4percent was unexplained. Few deaths were due to health system failure and domestic violence. Spontaneous preterm labour (18.4percent), abnormal labour or uterine rupture (14.5percent), maternal hypertension (12.4percent), antepartum haemorrhage (10.2percent) were the main associated maternal conditions causes of perinatal mortality in Barberton Hospital. Similarly, Fetal abnormality and infections were the main associated fetal condition causes of perinatal mortality. Of all the babies that were alive at birth, 85.2percent died due to maternal related conditions. Most neonates died due to spontaneous preterm labour (43.5percent) and abnormal labour or uterine rupture (23.1percent). Maternal HIV, diabetics and syphilis only accounted for a few neonatal deaths. For stillbirth babies that were alive at admission, abnormal labour or uterine rupture (33.1percent) and antepartum haemorrhage (19.7percent) were the main causes of their death. Over 60percent of all of macerated deaths have unexplained causes. Maternal hypertension is the main known cause of macerated stillbirth. For stillbirths that were dead on admission, maternal hypertension (13.1percent), antepartum haemorrhage (26.2percent) and abnormal labour or uterine rupture were the main causes of deaths. The majority of perinatal deaths in the hospital were caused by intrauterine deaths (58.8percent). Extreme multi-organ immaturity (13.1percent), Hyaline membrane disease (7.2percent) and Hypoxic ischaemic encephalopathy (5.2percent) were among the main final causes of perinatal deaths. The main behavioural factor causing perinatal mortality in Mpumalanga province was non-use of antenatal care services. The majority of perinatal mortality (60.4percent) was due to health system related causes. Most perinatal deaths were due to poor management of cases and delayed referral. Conclusion: The findings indicate that while stillbirths have slightly declined, neonatal deaths have not declined over the period. Perinatal have slightly declined in the hospital. The findings of this study also indicate that the majority of perinatal deaths in the hospital were caused by idiopathic preterm labour, unexplained intrauterine deaths, hypertension, and intrapartum asphyxia. Patient and health system related factors contributed significantly to perinatal deaths in the hospital. There is a need for yearly analysis of PPIP data to track progress and identify area for continuous improvement in provision of quality obstetric services. A greater community awareness of risk factors for perinatal deaths and importance of early and regular take up antenatal care services is needed.
- Full Text:
- Date Issued: 2018
A trust based model for enhanced adoption of diabetes self-management mobile applications
- Authors: Mainoti, Ganizani Fidelis
- Date: 2018
- Subjects: Medical records -- Data processing Medical records -- Management Mobile communication systems
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10353/11041 , vital:37011
- Description: Information technology (IT) trust is an important concept as people today rely more on IT to perform their tasks than before. Extensive research in Information Systems (IS) has explored trust and how it affects clients’ selection of different IT artefacts. Literature found trust to be a key determinant of technology use and an accelerator of understanding user perceptions regarding technology. Users’ perception of a technology’s characteristics influences their initial decision to adopt it; they are less likely to try the technology once they perceive significant risk linked to the technology exploration. The study focused on trust in relation to adoption of mobile applications (apps) for self-management of diabetic treatment regimens. The aim was to identify factors that should be incorporated in these apps to positively influence user perception of trustworthiness for enhanced adoption. According to extant literature, there are a myriad of apps which are available and ready for use, but diabetic patients are not maximising these opportunities to actively participate in managing their conditions. This is in spite of the numerous benefits accruable from using these apps to aid treatment regimens away from clinical settings or with minimal involvement of health personnel. This work is a qualitative study that investigated the reasons behind the low levels of trust in mobile applications for self-management of diabetes. The research design involved a survey and the study employed interviews for primary data collection. Twenty participants were engaged in the intervention. Some of these respondents were diabetic patients on treatment and others were health staff specialising in diabetes treatment. The participants were asked to download and try, for one month or more, the Diabetes:M app from Google play store for android devices or from iTunes for IOS devices. Thereafter, interviews were held with the participants to investigate their perceptions of the diabetes management app. Based on the outcome of the investigation, the researcher put forward a model proposing the attributes of trustworthiness of diabetes self-management mobile apps for enhanced adoption. Research findings showed that the apps for diabetes self-management should be usable, possess sufficient functionalities, give accurate information for decision-making, be reliable, and secure in order to enhance the trust of diabetic patients.
- Full Text:
- Date Issued: 2018
- Authors: Mainoti, Ganizani Fidelis
- Date: 2018
- Subjects: Medical records -- Data processing Medical records -- Management Mobile communication systems
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10353/11041 , vital:37011
- Description: Information technology (IT) trust is an important concept as people today rely more on IT to perform their tasks than before. Extensive research in Information Systems (IS) has explored trust and how it affects clients’ selection of different IT artefacts. Literature found trust to be a key determinant of technology use and an accelerator of understanding user perceptions regarding technology. Users’ perception of a technology’s characteristics influences their initial decision to adopt it; they are less likely to try the technology once they perceive significant risk linked to the technology exploration. The study focused on trust in relation to adoption of mobile applications (apps) for self-management of diabetic treatment regimens. The aim was to identify factors that should be incorporated in these apps to positively influence user perception of trustworthiness for enhanced adoption. According to extant literature, there are a myriad of apps which are available and ready for use, but diabetic patients are not maximising these opportunities to actively participate in managing their conditions. This is in spite of the numerous benefits accruable from using these apps to aid treatment regimens away from clinical settings or with minimal involvement of health personnel. This work is a qualitative study that investigated the reasons behind the low levels of trust in mobile applications for self-management of diabetes. The research design involved a survey and the study employed interviews for primary data collection. Twenty participants were engaged in the intervention. Some of these respondents were diabetic patients on treatment and others were health staff specialising in diabetes treatment. The participants were asked to download and try, for one month or more, the Diabetes:M app from Google play store for android devices or from iTunes for IOS devices. Thereafter, interviews were held with the participants to investigate their perceptions of the diabetes management app. Based on the outcome of the investigation, the researcher put forward a model proposing the attributes of trustworthiness of diabetes self-management mobile apps for enhanced adoption. Research findings showed that the apps for diabetes self-management should be usable, possess sufficient functionalities, give accurate information for decision-making, be reliable, and secure in order to enhance the trust of diabetic patients.
- Full Text:
- Date Issued: 2018
Access to information on higher education as a barrier for rural learners of Tyolomnqa Village, Eastern Cape
- Authors: Ntwasa, Simbongile
- Date: 2018
- Subjects: Information resources--South Africa--Eastern Cape Information services--South Africa--Eastern Cape Digital divide--South Africa
- Language: English
- Type: Thesis , Masters , Rural Development
- Identifier: http://hdl.handle.net/10353/17149 , vital:40860
- Description: Worldwide, there is a large body of research that convincingly demonstrates the benefits of Higher Education (HE) in the socio-economic status of individuals who have gone through and qualified with certificates, diplomas and degrees. But access to HE does not just benefit individuals, it also has benefits for communities or broader society (access to HE may benefit individual scholars, but can also benefit economically the entire families and poverty stricken communities such as those from Tsholomnqa village where this study was conducted). However, in South Africa, there is limited research that focuses on the importance of and challenges of access to HE as confronted by rural scholars. This research presents findings from a mixed method based study which sought to probe key issues relating to access to HE and challenges facing rural scholars regarding access to information on HE. The study involved as many as 209 Grade 12 learners from two high schools in the rural area of Tsholomnqa village in the Eastern Cape Province, a province associated with high levels of poverty, inequalities and unemployment in South Africa. The findings reveal that rural scholars about to qualify for university access information on HE information primarily from the internet. However, it was found that issues such as not having data or smartphones to search the internet and lack of support from their parents and teachers including universities affected their self-efficacy and self-esteem. The implications of these findings suggest that HE institutions must target and strengthen outreach and visibility in rural schools.
- Full Text:
- Date Issued: 2018
- Authors: Ntwasa, Simbongile
- Date: 2018
- Subjects: Information resources--South Africa--Eastern Cape Information services--South Africa--Eastern Cape Digital divide--South Africa
- Language: English
- Type: Thesis , Masters , Rural Development
- Identifier: http://hdl.handle.net/10353/17149 , vital:40860
- Description: Worldwide, there is a large body of research that convincingly demonstrates the benefits of Higher Education (HE) in the socio-economic status of individuals who have gone through and qualified with certificates, diplomas and degrees. But access to HE does not just benefit individuals, it also has benefits for communities or broader society (access to HE may benefit individual scholars, but can also benefit economically the entire families and poverty stricken communities such as those from Tsholomnqa village where this study was conducted). However, in South Africa, there is limited research that focuses on the importance of and challenges of access to HE as confronted by rural scholars. This research presents findings from a mixed method based study which sought to probe key issues relating to access to HE and challenges facing rural scholars regarding access to information on HE. The study involved as many as 209 Grade 12 learners from two high schools in the rural area of Tsholomnqa village in the Eastern Cape Province, a province associated with high levels of poverty, inequalities and unemployment in South Africa. The findings reveal that rural scholars about to qualify for university access information on HE information primarily from the internet. However, it was found that issues such as not having data or smartphones to search the internet and lack of support from their parents and teachers including universities affected their self-efficacy and self-esteem. The implications of these findings suggest that HE institutions must target and strengthen outreach and visibility in rural schools.
- Full Text:
- Date Issued: 2018
Action for increasing energy-saving behaviour in student residences at Rhodes University, South Africa
- Ancha, Angel, Bulunga, Lindelwa, Thondhlana, Gladman
- Authors: Ancha, Angel , Bulunga, Lindelwa , Thondhlana, Gladman
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67801 , vital:29146 , https://doi.org/10.1108/IJSHE-07-2017-0107
- Description: Publisher version , Purpose: In response to increasing energy demand and financial constraints to invest in green infrastructure, behaviour change energy-saving interventions are increasingly being considered as a tool for encouraging pro-environmental behaviour in campus residences. This paper aims to report on a pilot programme aimed at reducing energy consumption via behaviour change interventions, variably applied in residences at Rhodes University, South Africa. Design/methodology/approach: Data were collected via structured questionnaires, energy consumption records and post-intervention programme focus group discussions. Findings: Participant residences that received a mix of different interventions in the forms of pamphlets, face-to-face discussions, incentives and feedback recorded more energy reductions of up to 9 per cent than residences that received a single or no intervention. In post-experiment discussions, students cited personal, institutional and structural barriers to pro-environmental energy-use behaviour. Practical implications: Overall, the results of this study suggest that information provision of energy-saving tips combined with regular feedback and incentives can result in energy-use reductions in university residences, which may yield environmental and economic benefits for universities, but addressing barriers to pro-environmental behaviour might maximise the results. Originality/value: Given the lack of literature on energy conservation in the global South universities, this study provides the basis for discussing the potential for using behavioural interventions in universities for stirring pathways towards sustainability.
- Full Text: false
- Date Issued: 2018
- Authors: Ancha, Angel , Bulunga, Lindelwa , Thondhlana, Gladman
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67801 , vital:29146 , https://doi.org/10.1108/IJSHE-07-2017-0107
- Description: Publisher version , Purpose: In response to increasing energy demand and financial constraints to invest in green infrastructure, behaviour change energy-saving interventions are increasingly being considered as a tool for encouraging pro-environmental behaviour in campus residences. This paper aims to report on a pilot programme aimed at reducing energy consumption via behaviour change interventions, variably applied in residences at Rhodes University, South Africa. Design/methodology/approach: Data were collected via structured questionnaires, energy consumption records and post-intervention programme focus group discussions. Findings: Participant residences that received a mix of different interventions in the forms of pamphlets, face-to-face discussions, incentives and feedback recorded more energy reductions of up to 9 per cent than residences that received a single or no intervention. In post-experiment discussions, students cited personal, institutional and structural barriers to pro-environmental energy-use behaviour. Practical implications: Overall, the results of this study suggest that information provision of energy-saving tips combined with regular feedback and incentives can result in energy-use reductions in university residences, which may yield environmental and economic benefits for universities, but addressing barriers to pro-environmental behaviour might maximise the results. Originality/value: Given the lack of literature on energy conservation in the global South universities, this study provides the basis for discussing the potential for using behavioural interventions in universities for stirring pathways towards sustainability.
- Full Text: false
- Date Issued: 2018
Active learning strategies used by teachers during English reading comprehension lessons in six selected primary schools in Nigeria
- Adepoju, Adetokunboh Abayomi
- Authors: Adepoju, Adetokunboh Abayomi
- Date: 2018
- Subjects: Education, Primary -- Nigeria Learning strategies -- Nigeria
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/8485 , vital:32838
- Description: Reading is an integral part of education from which one gets access to information. Unfortunately, reading ability among primary school pupils, the foundation level of education, is at its lowest ebb. These pupils when they get to secondary schools eventually fail external examinations-a situation which according to National Examination Council, is caused by inappropriate teaching methods. Consequent upon this, this study assessed active learning strategies used by teacher during English reading comprehension lessons in six selected primary schools in Nigeria. The main research question was: How do teachers employ active learning strategies in teaching English reading comprehension? The study adopted qualitative approach and case study design. With the use of purposive sampling technique to select six head teachers, six primary VI teachers, two members of the School Basic Committee, the Director Local Government Education Authority and six focus groups. The study used interviews, documents and focus group interview as research instruments to collect data. Data were analysed based on interpretivism paradigm which interpreted participants’ views according to the word view of the participants. The study found out that teachers have good knowledge of active learning strategies and use them in teaching English reading comprehension lessons but are faced with some daunting challenges such as non-availability of instructional materials, lack of library, lack of qualified teachers and lack of time. The study concluded that students fail woefully in English reading comprehension because teachers do not use appropriate teaching techniques. The study recommend that teachers must use active learning strategies effectively and more often during English reading comprehension, more time should be allocated for English reading comprehension, effective use of instructional materials should be considered and the government should employ specialist teachers to teach English reading comprehension.
- Full Text:
- Date Issued: 2018
- Authors: Adepoju, Adetokunboh Abayomi
- Date: 2018
- Subjects: Education, Primary -- Nigeria Learning strategies -- Nigeria
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/8485 , vital:32838
- Description: Reading is an integral part of education from which one gets access to information. Unfortunately, reading ability among primary school pupils, the foundation level of education, is at its lowest ebb. These pupils when they get to secondary schools eventually fail external examinations-a situation which according to National Examination Council, is caused by inappropriate teaching methods. Consequent upon this, this study assessed active learning strategies used by teacher during English reading comprehension lessons in six selected primary schools in Nigeria. The main research question was: How do teachers employ active learning strategies in teaching English reading comprehension? The study adopted qualitative approach and case study design. With the use of purposive sampling technique to select six head teachers, six primary VI teachers, two members of the School Basic Committee, the Director Local Government Education Authority and six focus groups. The study used interviews, documents and focus group interview as research instruments to collect data. Data were analysed based on interpretivism paradigm which interpreted participants’ views according to the word view of the participants. The study found out that teachers have good knowledge of active learning strategies and use them in teaching English reading comprehension lessons but are faced with some daunting challenges such as non-availability of instructional materials, lack of library, lack of qualified teachers and lack of time. The study concluded that students fail woefully in English reading comprehension because teachers do not use appropriate teaching techniques. The study recommend that teachers must use active learning strategies effectively and more often during English reading comprehension, more time should be allocated for English reading comprehension, effective use of instructional materials should be considered and the government should employ specialist teachers to teach English reading comprehension.
- Full Text:
- Date Issued: 2018
Acute toxicity study and prevention of Nω-nitro-L-arginine methyl ester-induced hypertension by Osteopermum imbricatum
- Tata, Charlotte, M, Gwebu, Ephraim, T, Olukayode O Aremu, Nkeh-Chungag, Benedicta, N, Oyedeji, Adebola, O, Oyedeji, Opeopluwa, O, Sewani-Rusike, Constance, R
- Authors: Tata, Charlotte, M , Gwebu, Ephraim, T , Olukayode O Aremu , Nkeh-Chungag, Benedicta, N , Oyedeji, Adebola, O , Oyedeji, Opeopluwa, O , Sewani-Rusike, Constance, R
- Date: June-2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/4915 , vital:44303 , https://www.ajol.info/index.php/tjpr/article/view/174343
- Description: Purpose:To determine the phytochemical content, toxicity and hypertension prevention effects of Osteospermum imbricatum leaf and root extracts.Methods:Phytochemical screening of leaf and root extracts of O. imbricatum was performed by colorimetric procedure. Acute toxicity of leaf and root extracts was conductedin two phases; phase I consisted of three groups of mice (n = 3) for each dose level of 10, 100 and 1000 mg/kg while phase II had three mice that received 1600, 2900 or 5000 mg/kg. Wistar rats were grouped into 7 groups that were co-treated with L-NAME and normal saline or L-NAME and hydroethanolic leaf extract (150 and 300 mg/kg) or L-NAME and hydroethanolic root extract (150 and 300 mg/kg) or L-NAME and amlodipine (5 mg/kg) or normal saline only for 4 weeks. Treatment was carried out via the oral route while blood pressure was measured weeklyfor 4 weeks by non-invasive tail cuff method.Results:The phytochemical profile of the leaf and root extracts revealed the presence of phenols, terpenoids, flavonoids, glycosides, tannins, steroids and saponins. Both the leaf and root extracts were toxic at 5000 mg/kg with an LD50of 3807.89 mg/kg. In the fourth week of the study, only the leaf extract significantly (p less 0.01) prevented the progression of L-NAME induced hypertension; systolic and diastolic blood pressure of the group treated with L-NAME and leaf extract (300 mg/kg) were 183 ± 1 and 140 ± 1 mmHg, respectively, compared to the group that was treated with L-NAME and normal saline which produced systolic and diastolic BP values of 213 ± 3 and 172 ± 4 mmHg, respectively. The extracts, especially OIR300, exhibited diuretic effects in the second and third week of study by promoting excretion of 16 and 19 ml urine, respectively, compared to 11 and 14 ml for LN group.Conclusion:The results suggest that O. imbricatum is moderately toxic at a high dose and contains a wide range of phytochemicals which offer partial protection against the development of nitric oxide deficiency hypertension.
- Full Text:
- Date Issued: June-2018
- Authors: Tata, Charlotte, M , Gwebu, Ephraim, T , Olukayode O Aremu , Nkeh-Chungag, Benedicta, N , Oyedeji, Adebola, O , Oyedeji, Opeopluwa, O , Sewani-Rusike, Constance, R
- Date: June-2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/4915 , vital:44303 , https://www.ajol.info/index.php/tjpr/article/view/174343
- Description: Purpose:To determine the phytochemical content, toxicity and hypertension prevention effects of Osteospermum imbricatum leaf and root extracts.Methods:Phytochemical screening of leaf and root extracts of O. imbricatum was performed by colorimetric procedure. Acute toxicity of leaf and root extracts was conductedin two phases; phase I consisted of three groups of mice (n = 3) for each dose level of 10, 100 and 1000 mg/kg while phase II had three mice that received 1600, 2900 or 5000 mg/kg. Wistar rats were grouped into 7 groups that were co-treated with L-NAME and normal saline or L-NAME and hydroethanolic leaf extract (150 and 300 mg/kg) or L-NAME and hydroethanolic root extract (150 and 300 mg/kg) or L-NAME and amlodipine (5 mg/kg) or normal saline only for 4 weeks. Treatment was carried out via the oral route while blood pressure was measured weeklyfor 4 weeks by non-invasive tail cuff method.Results:The phytochemical profile of the leaf and root extracts revealed the presence of phenols, terpenoids, flavonoids, glycosides, tannins, steroids and saponins. Both the leaf and root extracts were toxic at 5000 mg/kg with an LD50of 3807.89 mg/kg. In the fourth week of the study, only the leaf extract significantly (p less 0.01) prevented the progression of L-NAME induced hypertension; systolic and diastolic blood pressure of the group treated with L-NAME and leaf extract (300 mg/kg) were 183 ± 1 and 140 ± 1 mmHg, respectively, compared to the group that was treated with L-NAME and normal saline which produced systolic and diastolic BP values of 213 ± 3 and 172 ± 4 mmHg, respectively. The extracts, especially OIR300, exhibited diuretic effects in the second and third week of study by promoting excretion of 16 and 19 ml urine, respectively, compared to 11 and 14 ml for LN group.Conclusion:The results suggest that O. imbricatum is moderately toxic at a high dose and contains a wide range of phytochemicals which offer partial protection against the development of nitric oxide deficiency hypertension.
- Full Text:
- Date Issued: June-2018
Adsorptive removal of ciprofloxacin and isoniazid from aqueous solution
- Dube, Cyril S, Tandlich, Roman, Wilhelmi, Brendan S
- Authors: Dube, Cyril S , Tandlich, Roman , Wilhelmi, Brendan S
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76846 , vital:30629 , https://doi.org/10.2478/nbec-2018-0002
- Description: This paper describes study of ciprofloxacin and isoniazid removal from aqueous solutions using coal fly ash (FA), kaolinite, perlite, talc and vermiculite. The adsorptive features of the adsorbents were evaluated for ciprofloxacin and isoniazid with regards to the effects of contact time, pH, the solid/liquid ratio and antibiotic concentration. All adsorbents were sterilised by dry heat before use to avoid the proliferation of antimicrobial resistance by the bacteria present on the adsorbents during experiments. The regression correlation coefficients indicate that the Langmuir model gives the best fit for the sorption of both antibiotics onto FA and talc, ciprofloxacin onto kaolinite, and isoniazid onto perlite and vermiculite with R2 values ranging from 0.908 – 0.999. The Freundlich isotherm best describes the sorption of ciprofloxacin onto vermiculite and isoniazid onto kaolinite with R2 values of 0.999 for both. The Tempkin model best describes the sorption of ciprofloxacin onto perlite with an R2 = 0.997. The values of the Freundlich exponent, 1/n, range from 0.221 – 0.998, indicating a favourable adsorption of ciprofloxacin and isoniazid onto the adsorbents. The heat of sorption, B, calculated from the Temkin plots has values ranging from 0.018 – 10.460 J/mol, indicating a physical adsorption process (physisorption). Adsorption equilibrium was achieved after 30 min for both antibiotics and the kinetic data obtained conforms best to the pseudo-second order equation with R2 values ranging from 0.998 – 0.999. The removal of ciprofloxacin and isoniazid by all adsorbents except FA was strongly influenced by the pH suggesting that electrostatic interactions play a major role in the adsorption processes.
- Full Text:
- Date Issued: 2018
- Authors: Dube, Cyril S , Tandlich, Roman , Wilhelmi, Brendan S
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76846 , vital:30629 , https://doi.org/10.2478/nbec-2018-0002
- Description: This paper describes study of ciprofloxacin and isoniazid removal from aqueous solutions using coal fly ash (FA), kaolinite, perlite, talc and vermiculite. The adsorptive features of the adsorbents were evaluated for ciprofloxacin and isoniazid with regards to the effects of contact time, pH, the solid/liquid ratio and antibiotic concentration. All adsorbents were sterilised by dry heat before use to avoid the proliferation of antimicrobial resistance by the bacteria present on the adsorbents during experiments. The regression correlation coefficients indicate that the Langmuir model gives the best fit for the sorption of both antibiotics onto FA and talc, ciprofloxacin onto kaolinite, and isoniazid onto perlite and vermiculite with R2 values ranging from 0.908 – 0.999. The Freundlich isotherm best describes the sorption of ciprofloxacin onto vermiculite and isoniazid onto kaolinite with R2 values of 0.999 for both. The Tempkin model best describes the sorption of ciprofloxacin onto perlite with an R2 = 0.997. The values of the Freundlich exponent, 1/n, range from 0.221 – 0.998, indicating a favourable adsorption of ciprofloxacin and isoniazid onto the adsorbents. The heat of sorption, B, calculated from the Temkin plots has values ranging from 0.018 – 10.460 J/mol, indicating a physical adsorption process (physisorption). Adsorption equilibrium was achieved after 30 min for both antibiotics and the kinetic data obtained conforms best to the pseudo-second order equation with R2 values ranging from 0.998 – 0.999. The removal of ciprofloxacin and isoniazid by all adsorbents except FA was strongly influenced by the pH suggesting that electrostatic interactions play a major role in the adsorption processes.
- Full Text:
- Date Issued: 2018
Adult binge drinking: rate, frequency and intensity in Buffalo City Metropolitan Municipality, South Africa
- Owolabi, Eyitayo Omolara, Goona, Daniel Ter, Adeniyi, Oladele Vincent, Seekoea, Eunice
- Authors: Owolabi, Eyitayo Omolara , Goona, Daniel Ter , Adeniyi, Oladele Vincent , Seekoea, Eunice
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/4944 , vital:44305 , https://doi.org/10.1080/20786190.2017.1382970
- Description: This study was conducted to explore views about the execution of powers and functions of the police in the light of related challenges. This study made use of data from a total of 83 adult participants (a survey involving 73 individuals, and 10 in-depth interviews), including males and females of diverse occupational backgrounds from Bindura and Mount Darwin policing districts in Zimbabwe. A closed-ended, mostly Likert-scale-based questionnaire was used to collect data about the prevalent forms of police abuse of powers and functions, while an in-depth interview guide was provided to harvest information qualitatively. Findings reveal that police officers abuse their powers through unlawful arrests, arbitrary search and seizure, excessive use of force, unlawful methods of investigation, and ill treatment of detainees. Though not as prevalent as other forms of abuse, malicious criminal prosecution and partisan policing were also cited.K EYWOR DS: powers, abuse, function, police, Zimbabwe
- Full Text:
- Date Issued: 2018
- Authors: Owolabi, Eyitayo Omolara , Goona, Daniel Ter , Adeniyi, Oladele Vincent , Seekoea, Eunice
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/4944 , vital:44305 , https://doi.org/10.1080/20786190.2017.1382970
- Description: This study was conducted to explore views about the execution of powers and functions of the police in the light of related challenges. This study made use of data from a total of 83 adult participants (a survey involving 73 individuals, and 10 in-depth interviews), including males and females of diverse occupational backgrounds from Bindura and Mount Darwin policing districts in Zimbabwe. A closed-ended, mostly Likert-scale-based questionnaire was used to collect data about the prevalent forms of police abuse of powers and functions, while an in-depth interview guide was provided to harvest information qualitatively. Findings reveal that police officers abuse their powers through unlawful arrests, arbitrary search and seizure, excessive use of force, unlawful methods of investigation, and ill treatment of detainees. Though not as prevalent as other forms of abuse, malicious criminal prosecution and partisan policing were also cited.K EYWOR DS: powers, abuse, function, police, Zimbabwe
- Full Text:
- Date Issued: 2018
Advanced high speed data and clock transmission over optical fibre for square kilometre telescope array
- Authors: Isoe, George Mosoti
- Date: 2018
- Subjects: Very large array telescopes -- South Africa , Semiconductor lasers Optical communications Optical amplifiers
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/30375 , vital:30935
- Description: There is an ever present need from Internet users for more bandwidth. This is manifested by continuous increase in bandwidth demanding applications such as 5G wireless, new end user consumer links like thunderbolt, video conferencing, high definition video-on-demand transmitted over the Internet and massive data transfers required with and within data centres for backup, storage and data processing in cloud computing. Fibre optic communications technologies are playing a pivotal role in communication, being a major enabling technology in our increasingly Internet-centric society. As network services continue to become more dynamic and diverse, Internet service providers are faced with a challenge of cost reduction in the transmission network, power and spectral efficiency as well as scalability of the optical network infrastructure to support incremental expansions and virtual machines. Intelligent design of terrestrial optical networks to allow for simultaneous signal transmission through shared network infrastructure, and the use of low cost, power efficient, high bandwidth transmitters such as vertical surface emitting lasers (VCSELs) as well as exploitation of spectral efficient in-complex advanced modulation formats is a viable approach to this situation. In this study, techniques for spectral efficiency upgrade and simultaneous transmission of data signal, reference frequency (RF) clock signal and pulse-per-second (PPS) over shared infrastructure have experimentally been optimized in a laboratory environment for adoption in next-generation telescope array networks such as the Square Kilometre Array (SKA), time keeping systems such as banking systems, Coordinated Universal Time(UTC) timing and Global Positioning Systems (GPS), as well as high capacity spectral efficient short reach optical fibre networks such as data centres. This work starts by experimentally optimizing VCSEL technology for simultaneous transmission of 10 Gbps data and 1.712 GHz RF clock signal over a single G. 655 optical fibre of length 24.75 Km at different channel spacing and different propagation direction for implementation in a cost effective next-generation telescope array network. The wavelength tuneability property of VCSEL transmitters allows for wavelength adjustment, a key requirement for simultaneous data and RF clock signal transmission over a single optical fibre. A receiver sensitivity of -19.19 dBm was experimentally achieved at back-to-back analysis. A 24.75 Km of simultaneous data and RF clock signal transmission performed at 0.4 nm channel spacing introduced a transmission penalty of 1.07 dB and 1.63 dB for counter and co-propagation scheme respectively. This work mainly utilized direct modulation and direct detection using a positive intrinsic negative (PIN) due to its simplicity and cost effectiveness. A novel modulation technique for simultaneous data and polarization-based pulse-per-second timing clock signal transmission using a single VCSEL carrier is experimentally demonstrated. Two signal types, a directly modulated 10 Gbps data signal and a polarization-based pulse per second (PPS) clock signal are modulated onto a single mode 10 GHz bandwidth VCSEL carrier at 1310 nm. Spectral efficiency is maximized by exploiting the inherent orthogonal polarization switching of the xiv VCSEL with changing bias in transmission of the PPS signal. A 10 Gbps VCSEL transmission with PPS over 11 Km of G.652 fibre introduced a transmission penalty of 0.52 dB. The contribution of PPS clock signal to this penalty was found to be 0.08 dB. A technique for simultaneous directly modulated data and phase modulated reference clock signal transmission over a signal channel in wavelength division multiplexing (WDM) solutions is experimentally demonstrated. This is to prepare solutions to the ever-increasing demand over gigabit/s, terabit/s and gigahertz capacities in WDM-based terrestrial optical fibre transmission systems such as telescope array networks. a total capacity of 30 Gbps (310 Gbps) data and 12 GHz ( 4 3 GHz) reference clock signal are multiplexed at a channel spacing of 100 GHz and simultaneously transmitted over a single mode G.655 fibre of length 24.73 Km. The recovery of the phase modulated RF clock signal using a differential delay line interferometry technique is experimentally demonstrated. A 625 Gbps (2525 Gbps) DWDM data transmission system is further implemented in simulation by multiplexing 25 channels at 25 Gbps per channel using 50 GHz channel spacing. A four level pulse amplitude modulation (4-PAM) data modulation format employing VCSELs is experimentally demonstrated for adoption in high bitrate networks such as big data science projects and data centre networks. 4-PAM offers a good trade-off between complexity, efficiency, reach, and sensitivity. A software defined digital signal processing (DSP) receiver is designed and implemented in MATLAB to recover the transmitted 4-PAM data signal cost effectively without the necessity of costly receiver hardware. A novel technique for maximizing carrier spectral efficiency through simultaneous 20 Gbps 4-PAM data and phase modulated 2 GHz RF clock signal transmission on a single mode 10 GHz bandwidth VCSEL carrier at 1310 nm is experimentally demonstrated for the first time to the best of our knowledge. Data transmission and clock stability performance of the designed high spectral efficient VCSEL-based link network is evaluated through BER curve plots, phase noise measurements and Allan variance analysis respectively. VCSEL-based Raman amplification is experimentally demonstrated as a viable approach for RF clock signal distribution in extended reach astronomical telescope array networks and other extended reach terrestrial optical fibre network application. This is achieved by adopting two pumping techniques namely forward pumping and backward pumping. A maximum on off gain of 5.7 dB and 1.5 dB was experimentally attained for forward pumping and backward pumping at 24 dBm pump power respectively, while a maximum 100.8 Km fibre transmission achieved experimentally. In summary, this study has successfully demonstrated in-complex, spectral efficient, low cost and power efficient simultaneous data signal, reference frequency (RF) clock signal and pulse-per-second (PPS) transmission techniques over shared network infrastructure. Simultaneous transmission of data, RF clock and PPS timing signal is relevant in nextgeneration telescope array networks such as the Square Kilometre Array (SKA), time keeping systems such as banking systems, Coordinated Universal Time (UTC) timing and Global Positioning Systems (GPS), as well as high capacity spectral efficient short reach optical fibre networks such as data centres.
- Full Text:
- Date Issued: 2018
- Authors: Isoe, George Mosoti
- Date: 2018
- Subjects: Very large array telescopes -- South Africa , Semiconductor lasers Optical communications Optical amplifiers
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/30375 , vital:30935
- Description: There is an ever present need from Internet users for more bandwidth. This is manifested by continuous increase in bandwidth demanding applications such as 5G wireless, new end user consumer links like thunderbolt, video conferencing, high definition video-on-demand transmitted over the Internet and massive data transfers required with and within data centres for backup, storage and data processing in cloud computing. Fibre optic communications technologies are playing a pivotal role in communication, being a major enabling technology in our increasingly Internet-centric society. As network services continue to become more dynamic and diverse, Internet service providers are faced with a challenge of cost reduction in the transmission network, power and spectral efficiency as well as scalability of the optical network infrastructure to support incremental expansions and virtual machines. Intelligent design of terrestrial optical networks to allow for simultaneous signal transmission through shared network infrastructure, and the use of low cost, power efficient, high bandwidth transmitters such as vertical surface emitting lasers (VCSELs) as well as exploitation of spectral efficient in-complex advanced modulation formats is a viable approach to this situation. In this study, techniques for spectral efficiency upgrade and simultaneous transmission of data signal, reference frequency (RF) clock signal and pulse-per-second (PPS) over shared infrastructure have experimentally been optimized in a laboratory environment for adoption in next-generation telescope array networks such as the Square Kilometre Array (SKA), time keeping systems such as banking systems, Coordinated Universal Time(UTC) timing and Global Positioning Systems (GPS), as well as high capacity spectral efficient short reach optical fibre networks such as data centres. This work starts by experimentally optimizing VCSEL technology for simultaneous transmission of 10 Gbps data and 1.712 GHz RF clock signal over a single G. 655 optical fibre of length 24.75 Km at different channel spacing and different propagation direction for implementation in a cost effective next-generation telescope array network. The wavelength tuneability property of VCSEL transmitters allows for wavelength adjustment, a key requirement for simultaneous data and RF clock signal transmission over a single optical fibre. A receiver sensitivity of -19.19 dBm was experimentally achieved at back-to-back analysis. A 24.75 Km of simultaneous data and RF clock signal transmission performed at 0.4 nm channel spacing introduced a transmission penalty of 1.07 dB and 1.63 dB for counter and co-propagation scheme respectively. This work mainly utilized direct modulation and direct detection using a positive intrinsic negative (PIN) due to its simplicity and cost effectiveness. A novel modulation technique for simultaneous data and polarization-based pulse-per-second timing clock signal transmission using a single VCSEL carrier is experimentally demonstrated. Two signal types, a directly modulated 10 Gbps data signal and a polarization-based pulse per second (PPS) clock signal are modulated onto a single mode 10 GHz bandwidth VCSEL carrier at 1310 nm. Spectral efficiency is maximized by exploiting the inherent orthogonal polarization switching of the xiv VCSEL with changing bias in transmission of the PPS signal. A 10 Gbps VCSEL transmission with PPS over 11 Km of G.652 fibre introduced a transmission penalty of 0.52 dB. The contribution of PPS clock signal to this penalty was found to be 0.08 dB. A technique for simultaneous directly modulated data and phase modulated reference clock signal transmission over a signal channel in wavelength division multiplexing (WDM) solutions is experimentally demonstrated. This is to prepare solutions to the ever-increasing demand over gigabit/s, terabit/s and gigahertz capacities in WDM-based terrestrial optical fibre transmission systems such as telescope array networks. a total capacity of 30 Gbps (310 Gbps) data and 12 GHz ( 4 3 GHz) reference clock signal are multiplexed at a channel spacing of 100 GHz and simultaneously transmitted over a single mode G.655 fibre of length 24.73 Km. The recovery of the phase modulated RF clock signal using a differential delay line interferometry technique is experimentally demonstrated. A 625 Gbps (2525 Gbps) DWDM data transmission system is further implemented in simulation by multiplexing 25 channels at 25 Gbps per channel using 50 GHz channel spacing. A four level pulse amplitude modulation (4-PAM) data modulation format employing VCSELs is experimentally demonstrated for adoption in high bitrate networks such as big data science projects and data centre networks. 4-PAM offers a good trade-off between complexity, efficiency, reach, and sensitivity. A software defined digital signal processing (DSP) receiver is designed and implemented in MATLAB to recover the transmitted 4-PAM data signal cost effectively without the necessity of costly receiver hardware. A novel technique for maximizing carrier spectral efficiency through simultaneous 20 Gbps 4-PAM data and phase modulated 2 GHz RF clock signal transmission on a single mode 10 GHz bandwidth VCSEL carrier at 1310 nm is experimentally demonstrated for the first time to the best of our knowledge. Data transmission and clock stability performance of the designed high spectral efficient VCSEL-based link network is evaluated through BER curve plots, phase noise measurements and Allan variance analysis respectively. VCSEL-based Raman amplification is experimentally demonstrated as a viable approach for RF clock signal distribution in extended reach astronomical telescope array networks and other extended reach terrestrial optical fibre network application. This is achieved by adopting two pumping techniques namely forward pumping and backward pumping. A maximum on off gain of 5.7 dB and 1.5 dB was experimentally attained for forward pumping and backward pumping at 24 dBm pump power respectively, while a maximum 100.8 Km fibre transmission achieved experimentally. In summary, this study has successfully demonstrated in-complex, spectral efficient, low cost and power efficient simultaneous data signal, reference frequency (RF) clock signal and pulse-per-second (PPS) transmission techniques over shared network infrastructure. Simultaneous transmission of data, RF clock and PPS timing signal is relevant in nextgeneration telescope array networks such as the Square Kilometre Array (SKA), time keeping systems such as banking systems, Coordinated Universal Time (UTC) timing and Global Positioning Systems (GPS), as well as high capacity spectral efficient short reach optical fibre networks such as data centres.
- Full Text:
- Date Issued: 2018
Advanced radio interferometric simulation and data reduction techniques
- Authors: Makhathini, Sphesihle
- Date: 2018
- Subjects: Interferometry , Radio interferometers , Algorithms , Radio telescopes , Square Kilometre Array (Project) , Very Large Array (Observatory : N.M.) , Radio astronomy
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/57348 , vital:26875
- Description: This work shows how legacy and novel radio Interferometry software packages and algorithms can be combined to produce high-quality reductions from modern telescopes, as well as end-to-end simulations for upcoming instruments such as the Square Kilometre Array (SKA) and its pathfinders. We first use a MeqTrees based simulations framework to quantify how artefacts due to direction-dependent effects accumulate with time, and the consequences of this accumulation when observing the same field multiple times in order to reach the survey depth. Our simulations suggest that a survey like LADUMA (Looking at the Distant Universe with MeerKAT Array), which aims to achieve its survey depth of 16 µJy/beam in a 72 kHz at 1.42 GHz by observing the same field for 1000 hours, will be able to reach its target depth in the presence of these artefacts. We also present stimela, a system agnostic scripting framework for simulating, processing and imaging radio interferometric data. This framework is then used to write an end-to-end simulation pipeline in order to quantify the resolution and sensitivity of the SKA1-MID telescope (the first phase of the SKA mid-frequency telescope) as a function of frequency, as well as the scale-dependent sensitivity of the telescope. Finally, a stimela-based reduction pipeline is used to process data of the field around the source 3C147, taken by the Karl G. Jansky Very Large Array (VLA). The reconstructed image from this reduction has a typical 1a noise level of 2.87 µJy/beam, and consequently a dynamic range of 8x106:1, given the 22.58 Jy/beam flux Density of the source 3C147.
- Full Text:
- Date Issued: 2018
- Authors: Makhathini, Sphesihle
- Date: 2018
- Subjects: Interferometry , Radio interferometers , Algorithms , Radio telescopes , Square Kilometre Array (Project) , Very Large Array (Observatory : N.M.) , Radio astronomy
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/57348 , vital:26875
- Description: This work shows how legacy and novel radio Interferometry software packages and algorithms can be combined to produce high-quality reductions from modern telescopes, as well as end-to-end simulations for upcoming instruments such as the Square Kilometre Array (SKA) and its pathfinders. We first use a MeqTrees based simulations framework to quantify how artefacts due to direction-dependent effects accumulate with time, and the consequences of this accumulation when observing the same field multiple times in order to reach the survey depth. Our simulations suggest that a survey like LADUMA (Looking at the Distant Universe with MeerKAT Array), which aims to achieve its survey depth of 16 µJy/beam in a 72 kHz at 1.42 GHz by observing the same field for 1000 hours, will be able to reach its target depth in the presence of these artefacts. We also present stimela, a system agnostic scripting framework for simulating, processing and imaging radio interferometric data. This framework is then used to write an end-to-end simulation pipeline in order to quantify the resolution and sensitivity of the SKA1-MID telescope (the first phase of the SKA mid-frequency telescope) as a function of frequency, as well as the scale-dependent sensitivity of the telescope. Finally, a stimela-based reduction pipeline is used to process data of the field around the source 3C147, taken by the Karl G. Jansky Very Large Array (VLA). The reconstructed image from this reduction has a typical 1a noise level of 2.87 µJy/beam, and consequently a dynamic range of 8x106:1, given the 22.58 Jy/beam flux Density of the source 3C147.
- Full Text:
- Date Issued: 2018
Aesthetic autonomy at the border:
- Authors: Tello, Verónica
- Date: 2018
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/146244 , vital:38508 , ISBN 9781786606860
- Description: Book abstract. Every politics is an aesthetic. If necropolitics is the (accelerated) politics of what is usually referred to as the ‘apolitical age’, what are its manoeuvres, temporalities, intensities, textures, and tipping points? Bypassing revelatory and reconstructionist approaches – the tendency of which is to show that a particular site or practice is necropolitical by bringing its genealogy into evidence – this collection of essays by artist-philosophers and theorist curators articulates the pre-perceptual working of necropolitics through a focus on the senses, assignments of energy, attitudes, cognitive processes, and discursive frameworks.
- Full Text:
- Date Issued: 2018
- Authors: Tello, Verónica
- Date: 2018
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/146244 , vital:38508 , ISBN 9781786606860
- Description: Book abstract. Every politics is an aesthetic. If necropolitics is the (accelerated) politics of what is usually referred to as the ‘apolitical age’, what are its manoeuvres, temporalities, intensities, textures, and tipping points? Bypassing revelatory and reconstructionist approaches – the tendency of which is to show that a particular site or practice is necropolitical by bringing its genealogy into evidence – this collection of essays by artist-philosophers and theorist curators articulates the pre-perceptual working of necropolitics through a focus on the senses, assignments of energy, attitudes, cognitive processes, and discursive frameworks.
- Full Text:
- Date Issued: 2018
African men and feminism: Reflections on using African feminism in research
- Authors: Chiweshe, Malvern T
- Date: 2018
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/453293 , vital:75243 , https://doi.org/10.1080/10130950.2018.1460088
- Description: The role of African men in African feminism is a precarious one. At the core are debates on whether African men can be feminist. Using my personal experiences as a starting point I navigate these debates. I delve into the politics of the term feminist and conclude, as Ratele and Botha (2013) did, that African men cannot be feminists but pro-feminists. The use of the identifier pro-feminist assists in not silencing African women’s voices. The adaptation of the identifier does not mean African men have no role to play in African feminism; in these spaces African men, acting as collaborators, can apply African feminist methods in their work as it provides rich analysis on the postcolonial position of women in Africa. I use my experiences of doing a PhD on abortion (a highly stigmatised research area in Africa) to illustrate how African feminist methods can enrich our analysis when researching Africa. I propose that it is only through collaborations between African women and men that issues of gender can continue to be addressed on the continent. African feminist methods provide useful tools for African men to challenge and problematise masculinities. I also warn against the danger of not reflecting on male privilege within the research space and how this can lead to a silencing of women’s voices.
- Full Text:
- Date Issued: 2018
- Authors: Chiweshe, Malvern T
- Date: 2018
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/453293 , vital:75243 , https://doi.org/10.1080/10130950.2018.1460088
- Description: The role of African men in African feminism is a precarious one. At the core are debates on whether African men can be feminist. Using my personal experiences as a starting point I navigate these debates. I delve into the politics of the term feminist and conclude, as Ratele and Botha (2013) did, that African men cannot be feminists but pro-feminists. The use of the identifier pro-feminist assists in not silencing African women’s voices. The adaptation of the identifier does not mean African men have no role to play in African feminism; in these spaces African men, acting as collaborators, can apply African feminist methods in their work as it provides rich analysis on the postcolonial position of women in Africa. I use my experiences of doing a PhD on abortion (a highly stigmatised research area in Africa) to illustrate how African feminist methods can enrich our analysis when researching Africa. I propose that it is only through collaborations between African women and men that issues of gender can continue to be addressed on the continent. African feminist methods provide useful tools for African men to challenge and problematise masculinities. I also warn against the danger of not reflecting on male privilege within the research space and how this can lead to a silencing of women’s voices.
- Full Text:
- Date Issued: 2018
Afrikanische Entwicklungsalternativen: Ubuntu und die Post-Development-Debatte
- Authors: Matthews, Sally
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142157 , vital:38054 , DOI: 10.3224/peripherie.v38i2.03
- Description: In post-development theory, ubuntu is often cited as an example of an “alternative to development”. This article investigates whether ubuntu can play this role and what to think of the demand for alternatives to development in general. In order to do this, the paper fi rst deals with central aspects of postdevelopment theory and the debate about ubuntu. Although the concept fi ts well into a post-development perspective, the attempts to contrast ubuntu with Western ideas and ways of life are often fueled by the desire to rekindle an original, pre-colonial, authentic African philosophy. Yet discourses on Africa are always embedded in Western discourses, so this opposition reproduces precisely those dichotomies it aims to fi ght. More generally, this also holds true for the idea of “alternatives to development”, which postulate an essential opposition to “development”. This, however, denies claims for equal rights and participation at the root of demands for “development”. The struggle for these claims cannot be fought beyond the existing global order. Instead of engaging in romanticizing projections about an Africa beyond “development”, people’s views and needs should be taken as the starting point for the struggle against injustice and inequality.
- Full Text:
- Date Issued: 2018
- Authors: Matthews, Sally
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142157 , vital:38054 , DOI: 10.3224/peripherie.v38i2.03
- Description: In post-development theory, ubuntu is often cited as an example of an “alternative to development”. This article investigates whether ubuntu can play this role and what to think of the demand for alternatives to development in general. In order to do this, the paper fi rst deals with central aspects of postdevelopment theory and the debate about ubuntu. Although the concept fi ts well into a post-development perspective, the attempts to contrast ubuntu with Western ideas and ways of life are often fueled by the desire to rekindle an original, pre-colonial, authentic African philosophy. Yet discourses on Africa are always embedded in Western discourses, so this opposition reproduces precisely those dichotomies it aims to fi ght. More generally, this also holds true for the idea of “alternatives to development”, which postulate an essential opposition to “development”. This, however, denies claims for equal rights and participation at the root of demands for “development”. The struggle for these claims cannot be fought beyond the existing global order. Instead of engaging in romanticizing projections about an Africa beyond “development”, people’s views and needs should be taken as the starting point for the struggle against injustice and inequality.
- Full Text:
- Date Issued: 2018
Ageing, wellbeing and development: Brazil and South Africa
- Barrientos, Armando, Moller, Valerie, Saboia, Joao, Lloyd-Sherlock, Peter, Mase, Julia
- Authors: Barrientos, Armando , Moller, Valerie , Saboia, Joao , Lloyd-Sherlock, Peter , Mase, Julia
- Date: 2018
- Language: English
- Type: book chapter , text
- Identifier: http://hdl.handle.net/10962/61690 , vital:28049 , https://books.google.co.za/books?id=0tFMDwAAQBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
- Full Text: false
- Date Issued: 2018
- Authors: Barrientos, Armando , Moller, Valerie , Saboia, Joao , Lloyd-Sherlock, Peter , Mase, Julia
- Date: 2018
- Language: English
- Type: book chapter , text
- Identifier: http://hdl.handle.net/10962/61690 , vital:28049 , https://books.google.co.za/books?id=0tFMDwAAQBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
- Full Text: false
- Date Issued: 2018