Raging in service of the self: exploring a five-year old boy's aggression within his play therapy
- Authors: Smith, Austin
- Date: 2006
- Subjects: Play therapy , Aggressiveness in children , Self-perception in children , Child development , Child psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3057 , http://hdl.handle.net/10962/d1002566 , Play therapy , Aggressiveness in children , Self-perception in children , Child development , Child psychology
- Description: This thesis takes the form of an in-depth case study within which the play therapy process of an aggressive 5-year-old boy was explored. The aim of the research was to examine the abundant expressions of aggression that were present within his therapy, and in so doing reflect their rich communicative content and their relevance and purpose in the development of his Self. Object relations theory formed the lens and theoretical context for this research with Winnicott’s contributions and Parens' model of aggression being considered in particular. A detailed data resource of the therapy process was compiled and transposed into narrative form. These narratives were reviewed with a reading guide as a means to facilitate a hermeneutic exploration of the data. The emergent themes were considered against the case data and the current theory, which allowed for their further analysis and development. From this the value of using Parens’ model was considered and deemed useful although limited in its contribution. The analysis and the themes which emerged conveyed how within this case the child’s aggression presented as: a significant feature of his ambivalence towards relationships; a powerful and pervasive protective fantasy of omnipotence; inherently linked to his sense of self and self expression; and as actively involved in his True Self’s hope-filled attempts for an alternative experience. This thesis provides a descriptive account of a challenging case, offering insights into the value and meaningful content of aggressive behaviours, with the intention being to reflect that which is often not easily appreciated or readily observable within such a therapy process, a trace of hope.
- Full Text:
- Date Issued: 2006
- Authors: Smith, Austin
- Date: 2006
- Subjects: Play therapy , Aggressiveness in children , Self-perception in children , Child development , Child psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3057 , http://hdl.handle.net/10962/d1002566 , Play therapy , Aggressiveness in children , Self-perception in children , Child development , Child psychology
- Description: This thesis takes the form of an in-depth case study within which the play therapy process of an aggressive 5-year-old boy was explored. The aim of the research was to examine the abundant expressions of aggression that were present within his therapy, and in so doing reflect their rich communicative content and their relevance and purpose in the development of his Self. Object relations theory formed the lens and theoretical context for this research with Winnicott’s contributions and Parens' model of aggression being considered in particular. A detailed data resource of the therapy process was compiled and transposed into narrative form. These narratives were reviewed with a reading guide as a means to facilitate a hermeneutic exploration of the data. The emergent themes were considered against the case data and the current theory, which allowed for their further analysis and development. From this the value of using Parens’ model was considered and deemed useful although limited in its contribution. The analysis and the themes which emerged conveyed how within this case the child’s aggression presented as: a significant feature of his ambivalence towards relationships; a powerful and pervasive protective fantasy of omnipotence; inherently linked to his sense of self and self expression; and as actively involved in his True Self’s hope-filled attempts for an alternative experience. This thesis provides a descriptive account of a challenging case, offering insights into the value and meaningful content of aggressive behaviours, with the intention being to reflect that which is often not easily appreciated or readily observable within such a therapy process, a trace of hope.
- Full Text:
- Date Issued: 2006
French Research Director visits Rhodes
- Authors: Phiri, Aretha
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7209 , http://hdl.handle.net/10962/d1006415
- Description: Dr Fethi Bedioui, a research director from the Centre National de la Recherche Scientifique (CNRS) in Paris, recently spent two weeks in the Department of Chemistry working with Professor Tebello Nyokong's research group.
- Full Text:
- Date Issued: 2008
- Authors: Phiri, Aretha
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7209 , http://hdl.handle.net/10962/d1006415
- Description: Dr Fethi Bedioui, a research director from the Centre National de la Recherche Scientifique (CNRS) in Paris, recently spent two weeks in the Department of Chemistry working with Professor Tebello Nyokong's research group.
- Full Text:
- Date Issued: 2008
From Pringles of the Valleys
- Pringle, Eric, 1907-, Pringle, Mark Elliot, 1880-, Pringle, John Adams, 1910-
- Authors: Pringle, Eric, 1907- , Pringle, Mark Elliot, 1880- , Pringle, John Adams, 1910-
- Date: 1957
- Subjects: Acacia karroo -- South Africa , Trees -- South Africa
- Language: English
- Type: mixed material , essay
- Identifier: http://hdl.handle.net/10962/109198 , vital:33084
- Description: Transcript: "from PRINGLES OF THE VALLEYS ,1957, by Eric, Mark and John Pringle. p.29. (On the farm now known as Clifton). "The next day, July 2nd (1820) was our first Sunday on our own grounds. Feeling deeply the importance of maintaining the suitable observance of this day of sacred rest, it was unanimously resolved that we should strictly abstain from an secular employment not sanctioned by absolute necessity; and at the same time commence such a system of religious services as might be with propriety maintained in the absence of a clergyman or minister. The whole party were accordingly assembled after breakfast under a venerable acacia tree, on the margin of a little stream which murmured around our camp. It was, indeed, an affecting sight to look round on our little band of Scottish emigrants, thus congregated for the first time to worship God in the wild glen allotted for their future home and the heritage of their offspring". An inspection in 1956 established this spot with some certainty is just south of the present Craig Rennie homestead".
- Full Text:
- Date Issued: 1957
- Authors: Pringle, Eric, 1907- , Pringle, Mark Elliot, 1880- , Pringle, John Adams, 1910-
- Date: 1957
- Subjects: Acacia karroo -- South Africa , Trees -- South Africa
- Language: English
- Type: mixed material , essay
- Identifier: http://hdl.handle.net/10962/109198 , vital:33084
- Description: Transcript: "from PRINGLES OF THE VALLEYS ,1957, by Eric, Mark and John Pringle. p.29. (On the farm now known as Clifton). "The next day, July 2nd (1820) was our first Sunday on our own grounds. Feeling deeply the importance of maintaining the suitable observance of this day of sacred rest, it was unanimously resolved that we should strictly abstain from an secular employment not sanctioned by absolute necessity; and at the same time commence such a system of religious services as might be with propriety maintained in the absence of a clergyman or minister. The whole party were accordingly assembled after breakfast under a venerable acacia tree, on the margin of a little stream which murmured around our camp. It was, indeed, an affecting sight to look round on our little band of Scottish emigrants, thus congregated for the first time to worship God in the wild glen allotted for their future home and the heritage of their offspring". An inspection in 1956 established this spot with some certainty is just south of the present Craig Rennie homestead".
- Full Text:
- Date Issued: 1957
The perceptions of staff and management regarding social dialogue and codetermination at Goedgedacht Trust
- Authors: Hartley, Craig
- Date: 2021-04
- Subjects: Management -- Employee participation -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/52546 , vital:43685
- Description: The purpose of this study is to determine the perception of Management and Staff at Goedgedacht Trust regarding Social Dialogue and Codetermination. Goedgedacht Trust is a non-profit organisation that has been in existence for 27 (twenty-seven) years. The organisation pursues its mandate to alleviate poverty in the rural communities of the Swartland area in the Western Cape. Funders of Goedgedacht Trust have undertaken 2 (two) impact studies, the reports of which constitute the impetus for this study. The study utilised a qualitative research methodology and research explores the field of Organisational Behaviour, General and Human Resource Management in the context of a non-profit organisation. It is submitted that the findings emanating from this paper are equally applicable to organisations with a profit driven agenda. In terms of the findings, it is submitted that the overriding perception of both Staff and Management was that Social Dialogue and Codetermination were practiced to a certain degree, albeit on an ad hoc basis such that it did not result in any significant value to the organisation’s success at the time of writing. As set out more fully herein, a concerted effort is required to make Social Dialogue and Codetermination a strategic objective of an organisation, which objective should be pursued and the outcomes measured (with shortcomings appropriately addressed) for continuous improvement. Following this study, it is submitted that for there to be impactful Social Dialogue and Codetermination, the organisation in question must foster an environment that encourages vertical communication throughout, undertakes a cohesive and transformative approach to management and an overall collaborative culture at all levels. The study also found that the support factors to Social Dialogue and Codetermination is an engaging, collaborative culture with communication that is open throughout the organisation. Furthermore, in addition to inter alia an inclusive and engaging culture, Social Dialogue and Codetermination requires a well-defined Human Resource Management and a Conflict Management system, which should be transparent, trustworthy and consistent in its application. This study lays the foundation for further research on the effectiveness of the proposed conflict management system and whether conflict management has produced a saving on the real cost of conflict at Goedgedacht Trust. , Thesis (MPhil) -- Faculty of Humanities, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Hartley, Craig
- Date: 2021-04
- Subjects: Management -- Employee participation -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/52546 , vital:43685
- Description: The purpose of this study is to determine the perception of Management and Staff at Goedgedacht Trust regarding Social Dialogue and Codetermination. Goedgedacht Trust is a non-profit organisation that has been in existence for 27 (twenty-seven) years. The organisation pursues its mandate to alleviate poverty in the rural communities of the Swartland area in the Western Cape. Funders of Goedgedacht Trust have undertaken 2 (two) impact studies, the reports of which constitute the impetus for this study. The study utilised a qualitative research methodology and research explores the field of Organisational Behaviour, General and Human Resource Management in the context of a non-profit organisation. It is submitted that the findings emanating from this paper are equally applicable to organisations with a profit driven agenda. In terms of the findings, it is submitted that the overriding perception of both Staff and Management was that Social Dialogue and Codetermination were practiced to a certain degree, albeit on an ad hoc basis such that it did not result in any significant value to the organisation’s success at the time of writing. As set out more fully herein, a concerted effort is required to make Social Dialogue and Codetermination a strategic objective of an organisation, which objective should be pursued and the outcomes measured (with shortcomings appropriately addressed) for continuous improvement. Following this study, it is submitted that for there to be impactful Social Dialogue and Codetermination, the organisation in question must foster an environment that encourages vertical communication throughout, undertakes a cohesive and transformative approach to management and an overall collaborative culture at all levels. The study also found that the support factors to Social Dialogue and Codetermination is an engaging, collaborative culture with communication that is open throughout the organisation. Furthermore, in addition to inter alia an inclusive and engaging culture, Social Dialogue and Codetermination requires a well-defined Human Resource Management and a Conflict Management system, which should be transparent, trustworthy and consistent in its application. This study lays the foundation for further research on the effectiveness of the proposed conflict management system and whether conflict management has produced a saving on the real cost of conflict at Goedgedacht Trust. , Thesis (MPhil) -- Faculty of Humanities, 2021
- Full Text:
- Date Issued: 2021-04
An empirical formula for estimating the water use of Scaevola plumieri
- Peter, Craig I, Ripley, Bradley S
- Authors: Peter, Craig I , Ripley, Bradley S
- Date: 2000
- Language: English
- Type: Article
- Identifier: vital:6530 , http://hdl.handle.net/10962/d1005971
- Description: Transpirational water loss of Scaevola plumieri (L) Vahl. (= Scaevola thunbergii Eckl. & Zeyh.) (Goodeniaceae), a dune pioneer plant along the eastern and southern coasts of South Africa, was measured over a wide range of atmospheric conditions and related to the atmospheric vapour pressure deficit (VPD). A plot of leaf transpiration rate (E) against VPD yielded a curvilinear relationship (r[sup 2] = 0.88, P = 0.000). As both leaf and canopy E were found to be closely coupled to atmospheric conditions, this correlation was used to calculate canopy E for entire days. The bulk volumes of water transpired per day were related to the mean daily temperature as recorded at a nearby weather station and were strongly related (r2 = 0.71, P = 0.0037). This correlation allowed the bulk volume of water transpired by one square metre of a S. plumieri-covered dune to be calculated on a daily basis for an entire year. Transpirational losses (566 litres) in 1997 were then compared with rainfall (539 litres), indicating that rainfall was perhaps insufficient to support the plants that year. Similar deficits were calculated for 1996, suggesting that plants were possibly reliant on water stored in the sand or taped ground water. This species showed an unusual positive response of increasing leaf conductance to increasing VPD over the range 0-3 kPa.
- Full Text: false
- Date Issued: 2000
- Authors: Peter, Craig I , Ripley, Bradley S
- Date: 2000
- Language: English
- Type: Article
- Identifier: vital:6530 , http://hdl.handle.net/10962/d1005971
- Description: Transpirational water loss of Scaevola plumieri (L) Vahl. (= Scaevola thunbergii Eckl. & Zeyh.) (Goodeniaceae), a dune pioneer plant along the eastern and southern coasts of South Africa, was measured over a wide range of atmospheric conditions and related to the atmospheric vapour pressure deficit (VPD). A plot of leaf transpiration rate (E) against VPD yielded a curvilinear relationship (r[sup 2] = 0.88, P = 0.000). As both leaf and canopy E were found to be closely coupled to atmospheric conditions, this correlation was used to calculate canopy E for entire days. The bulk volumes of water transpired per day were related to the mean daily temperature as recorded at a nearby weather station and were strongly related (r2 = 0.71, P = 0.0037). This correlation allowed the bulk volume of water transpired by one square metre of a S. plumieri-covered dune to be calculated on a daily basis for an entire year. Transpirational losses (566 litres) in 1997 were then compared with rainfall (539 litres), indicating that rainfall was perhaps insufficient to support the plants that year. Similar deficits were calculated for 1996, suggesting that plants were possibly reliant on water stored in the sand or taped ground water. This species showed an unusual positive response of increasing leaf conductance to increasing VPD over the range 0-3 kPa.
- Full Text: false
- Date Issued: 2000
A common framework for lattice-valued uniform spaces and probabilistic uniform limit spaces
- Craig, Andrew, Jäger, Gunter
- Authors: Craig, Andrew , Jäger, Gunter
- Date: 2009
- Language: English
- Type: Article
- Identifier: vital:6784 , http://hdl.handle.net/10962/d1006927
- Description: We study a category of lattice-valued uniform convergence spaces where the lattice is enriched by two algebraic operations. This general setting allows us to view the category of lattice-valued uniform spaces as a reflective subcategory of our category, and the category of probabilistic uniform limit spaces as a coreflective subcategory.
- Full Text:
- Date Issued: 2009
- Authors: Craig, Andrew , Jäger, Gunter
- Date: 2009
- Language: English
- Type: Article
- Identifier: vital:6784 , http://hdl.handle.net/10962/d1006927
- Description: We study a category of lattice-valued uniform convergence spaces where the lattice is enriched by two algebraic operations. This general setting allows us to view the category of lattice-valued uniform spaces as a reflective subcategory of our category, and the category of probabilistic uniform limit spaces as a coreflective subcategory.
- Full Text:
- Date Issued: 2009
Military strategy and it's [i.e.] its use in competitive strategy with reference to the Nelson Mandela Metropole automotive industry
- Authors: Fouché, Craig
- Date: 2005
- Subjects: Strategic planning -- South Africa -- Nelson Mandela Metropole , Automobile industry and trade -- South Africa -- Nelson Mandela Metropole , Competition
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8542 , http://hdl.handle.net/10948/177 , Strategic planning -- South Africa -- Nelson Mandela Metropole , Automobile industry and trade -- South Africa -- Nelson Mandela Metropole , Competition
- Description: Presently in the South African automotive industry competition is becoming more fierce. It is becoming more important for companies to concentrate on thier competitive strategies to ensure that they remain competitive in this industry. Military strategy techniques have always been successful in defeating an anemy opponent. An enemy in a military sense could be considered as a competitor in a business sense. There is currently a potential for an improvement of the competitive strategies that South African organisations, in particular the South African automotive industry uses to remain competitive. Military strategists such as Sun Tzu and Carl von Clausewitz have provided valuable strategy theories and philosophies to many military institutions. Military strategies such as Attrition and Maneuver have long been used by these institutions in battle to defeat the enemy. Military strategies could provide the edge that companies ranging from manufacturers, suppliers of components and dealerships need, to remain competitive in the automotive industry.
- Full Text: false
- Date Issued: 2005
- Authors: Fouché, Craig
- Date: 2005
- Subjects: Strategic planning -- South Africa -- Nelson Mandela Metropole , Automobile industry and trade -- South Africa -- Nelson Mandela Metropole , Competition
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8542 , http://hdl.handle.net/10948/177 , Strategic planning -- South Africa -- Nelson Mandela Metropole , Automobile industry and trade -- South Africa -- Nelson Mandela Metropole , Competition
- Description: Presently in the South African automotive industry competition is becoming more fierce. It is becoming more important for companies to concentrate on thier competitive strategies to ensure that they remain competitive in this industry. Military strategy techniques have always been successful in defeating an anemy opponent. An enemy in a military sense could be considered as a competitor in a business sense. There is currently a potential for an improvement of the competitive strategies that South African organisations, in particular the South African automotive industry uses to remain competitive. Military strategists such as Sun Tzu and Carl von Clausewitz have provided valuable strategy theories and philosophies to many military institutions. Military strategies such as Attrition and Maneuver have long been used by these institutions in battle to defeat the enemy. Military strategies could provide the edge that companies ranging from manufacturers, suppliers of components and dealerships need, to remain competitive in the automotive industry.
- Full Text: false
- Date Issued: 2005
Testing chemical markers on granivorous birds
- Steele, G R, Whittington-Jones, Craig A, Craig, Adrian J F K
- Authors: Steele, G R , Whittington-Jones, Craig A , Craig, Adrian J F K
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6936 , http://hdl.handle.net/10962/d1011957
- Description: We tested two substances (oxytetracycline and rhodamine B) that can be added to food or water of free-living birds, and serve as markers in their plumage for later identification. Oxytetracycline produced no detectable changes in the plumage of red bishops or redbilled queleas. Rhodamine B fed to captive birds produced fluorescence in the wing feathers when viewed under ultraviolet light. This fluorescence lasted for at least 14 weeks, and was retained until feathers were moulted. Rhodamine B may thus be useful in identifying birds using a specific feeding site, and for studies of moult and feather growth.
- Full Text: false
- Date Issued: 1999
- Authors: Steele, G R , Whittington-Jones, Craig A , Craig, Adrian J F K
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6936 , http://hdl.handle.net/10962/d1011957
- Description: We tested two substances (oxytetracycline and rhodamine B) that can be added to food or water of free-living birds, and serve as markers in their plumage for later identification. Oxytetracycline produced no detectable changes in the plumage of red bishops or redbilled queleas. Rhodamine B fed to captive birds produced fluorescence in the wing feathers when viewed under ultraviolet light. This fluorescence lasted for at least 14 weeks, and was retained until feathers were moulted. Rhodamine B may thus be useful in identifying birds using a specific feeding site, and for studies of moult and feather growth.
- Full Text: false
- Date Issued: 1999
Vice-chancellor's speech for plaque ceremony: Chapel of St. May and all the Angels
- Authors: Henderson, Derek Scott
- Language: English
- Type: Text
- Identifier: vital:7570 , http://hdl.handle.net/10962/d1018447
- Description: Unveiling of the Plaque on the occasion of the Chaepl of St. Mary and all the Angels being declared a national monument, 9 February 1982.
- Full Text:
- Authors: Henderson, Derek Scott
- Language: English
- Type: Text
- Identifier: vital:7570 , http://hdl.handle.net/10962/d1018447
- Description: Unveiling of the Plaque on the occasion of the Chaepl of St. Mary and all the Angels being declared a national monument, 9 February 1982.
- Full Text:
A review of generalized linear models for count data with emphasis on current geospatial procedures
- Authors: Michell, Justin Walter
- Date: 2016
- Subjects: Spatial analysis (Statistics) , Bayesian statistical decision theory , Geospatial data , Malaria -- Botswana -- Statistics , Malaria -- Botswana -- Research -- Statistical methods
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:5582 , http://hdl.handle.net/10962/d1019989
- Description: Analytical problems caused by over-fitting, confounding and non-independence in the data is a major challenge for variable selection. As more variables are tested against a certain data set, there is a greater risk that some will explain the data merely by chance, but will fail to explain new data. The main aim of this study is to employ a systematic and practicable variable selection process for the spatial analysis and mapping of historical malaria risk in Botswana using data collected from the MARA (Mapping Malaria Risk in Africa) project and environmental and climatic datasets from various sources. Details of how a spatial database is compiled for a statistical analysis to proceed is provided. The automation of the entire process is also explored. The final bayesian spatial model derived from the non-spatial variable selection procedure using Markov Chain Monte Carlo simulation was fitted to the data. Winter temperature had the greatest effect of malaria prevalence in Botswana. Summer rainfall, maximum temperature of the warmest month, annual range of temperature, altitude and distance to closest water source were also significantly associated with malaria prevalence in the final spatial model after accounting for spatial correlation. Using this spatial model malaria prevalence at unobserved locations was predicted, producing a smooth risk map covering Botswana. The automation of both compiling the spatial database and the variable selection procedure proved challenging and could only be achieved in parts of the process. The non-spatial selection procedure proved practical and was able to identify stable explanatory variables and provide an objective means for selecting one variable over another, however ultimately it was not entirely successful due to the fact that a unique set of spatial variables could not be selected.
- Full Text:
- Date Issued: 2016
- Authors: Michell, Justin Walter
- Date: 2016
- Subjects: Spatial analysis (Statistics) , Bayesian statistical decision theory , Geospatial data , Malaria -- Botswana -- Statistics , Malaria -- Botswana -- Research -- Statistical methods
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:5582 , http://hdl.handle.net/10962/d1019989
- Description: Analytical problems caused by over-fitting, confounding and non-independence in the data is a major challenge for variable selection. As more variables are tested against a certain data set, there is a greater risk that some will explain the data merely by chance, but will fail to explain new data. The main aim of this study is to employ a systematic and practicable variable selection process for the spatial analysis and mapping of historical malaria risk in Botswana using data collected from the MARA (Mapping Malaria Risk in Africa) project and environmental and climatic datasets from various sources. Details of how a spatial database is compiled for a statistical analysis to proceed is provided. The automation of the entire process is also explored. The final bayesian spatial model derived from the non-spatial variable selection procedure using Markov Chain Monte Carlo simulation was fitted to the data. Winter temperature had the greatest effect of malaria prevalence in Botswana. Summer rainfall, maximum temperature of the warmest month, annual range of temperature, altitude and distance to closest water source were also significantly associated with malaria prevalence in the final spatial model after accounting for spatial correlation. Using this spatial model malaria prevalence at unobserved locations was predicted, producing a smooth risk map covering Botswana. The automation of both compiling the spatial database and the variable selection procedure proved challenging and could only be achieved in parts of the process. The non-spatial selection procedure proved practical and was able to identify stable explanatory variables and provide an objective means for selecting one variable over another, however ultimately it was not entirely successful due to the fact that a unique set of spatial variables could not be selected.
- Full Text:
- Date Issued: 2016
Flower orientation in Gloriosa superba (Colchicaceae) promotes cross-pollination via butterfly wings:
- Daniels, Ryan J, Johnson, Steven D, Peter, Craig I
- Authors: Daniels, Ryan J , Johnson, Steven D , Peter, Craig I
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/150141 , vital:38943 , https://0-doi.org.wam.seals.ac.za/10.1093/aob/mcaa048
- Description: Complex modifications of angiosperm flowers often function for precise pollen placement on pollinators and to promote cross-pollination. We explore the functional significance of the unusually elaborate morphology of Gloriosa superba flowers, which are divided into one hermaphrodite meranthium and five male meranthia (functional pollination units of a single flower). We used controlled pollination experiments, floral measurements, pollen load analyses and visitor observations in four populations of G. superba in South Africa to determine the breeding system, mechanism of pollination and role of flower in the promotion of cross-pollination.
- Full Text:
- Date Issued: 2020
- Authors: Daniels, Ryan J , Johnson, Steven D , Peter, Craig I
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/150141 , vital:38943 , https://0-doi.org.wam.seals.ac.za/10.1093/aob/mcaa048
- Description: Complex modifications of angiosperm flowers often function for precise pollen placement on pollinators and to promote cross-pollination. We explore the functional significance of the unusually elaborate morphology of Gloriosa superba flowers, which are divided into one hermaphrodite meranthium and five male meranthia (functional pollination units of a single flower). We used controlled pollination experiments, floral measurements, pollen load analyses and visitor observations in four populations of G. superba in South Africa to determine the breeding system, mechanism of pollination and role of flower in the promotion of cross-pollination.
- Full Text:
- Date Issued: 2020
Intellectual achievement in pursuit of true belief
- Authors: Shapiro, Lucy Deborah
- Date: 2006 , 2013-06-14
- Subjects: Delusions , Knowledge, Theory of , Epistemics , Truth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2735 , http://hdl.handle.net/10962/d1005955 , Delusions , Knowledge, Theory of , Epistemics , Truth
- Description: The practice of inquiry, in which we seek and pursue true beliefs by forming justified beliefs, is important to us. This thesis will address two questions concerning the significance of this practice. These are the question of what explains our preference for this particular belief-forming practice, and whether this value can be explained by the value of true belief alone. To answer these questions I will examme a variety of our intuitive commitments to particular values, assuming their general accuracy. I will use an inference from the goal of a practice to the value of a practice, an inference based on the assumption that when we pursue something it is valuable. I will discuss our intuitive commitments to the value of justification. I will also rely on the implications of the presence of pride and admiration in relation to the outcome of an inquiry (especially in situations where a belief is difficult to form). By using this methodology, I will argue for three sources of value that explain the unique significance of the value of inquiry. The first is the value of its unique role in our being able to form reliably true beliefs. Second, I will argue for Wayne D. Riggs' account of epistemic credit; Riggs defends the value of our being responsible for true beliefs, they are our achievements. Third, I will argue for an additional the value of delivering a skilful epistemic performance, another kind of achievement. I will show that although the value of true belief plays a role in explaining some of the values, the third value for inquiry is independent of the value of true belief. This means that there are intellectual rewards, which can be gained from this practice, that extend beyond the value of true belief. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2006
- Authors: Shapiro, Lucy Deborah
- Date: 2006 , 2013-06-14
- Subjects: Delusions , Knowledge, Theory of , Epistemics , Truth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2735 , http://hdl.handle.net/10962/d1005955 , Delusions , Knowledge, Theory of , Epistemics , Truth
- Description: The practice of inquiry, in which we seek and pursue true beliefs by forming justified beliefs, is important to us. This thesis will address two questions concerning the significance of this practice. These are the question of what explains our preference for this particular belief-forming practice, and whether this value can be explained by the value of true belief alone. To answer these questions I will examme a variety of our intuitive commitments to particular values, assuming their general accuracy. I will use an inference from the goal of a practice to the value of a practice, an inference based on the assumption that when we pursue something it is valuable. I will discuss our intuitive commitments to the value of justification. I will also rely on the implications of the presence of pride and admiration in relation to the outcome of an inquiry (especially in situations where a belief is difficult to form). By using this methodology, I will argue for three sources of value that explain the unique significance of the value of inquiry. The first is the value of its unique role in our being able to form reliably true beliefs. Second, I will argue for Wayne D. Riggs' account of epistemic credit; Riggs defends the value of our being responsible for true beliefs, they are our achievements. Third, I will argue for an additional the value of delivering a skilful epistemic performance, another kind of achievement. I will show that although the value of true belief plays a role in explaining some of the values, the third value for inquiry is independent of the value of true belief. This means that there are intellectual rewards, which can be gained from this practice, that extend beyond the value of true belief. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2006
Scientific theories : a philosophical analysis
- Authors: Schwerin, Alan Kenneth
- Date: 1979
- Subjects: Science -- Philosophy , Logical positivism , Realism
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2701 , http://hdl.handle.net/10962/d1001976
- Description: In this essay I have considered some of the philosophical problems involved in attempting to settle the question, What are scientific theories about? And in order to expose these problems, I have dealt with two influential responses to this question of the referents of scientific theories - namely, logical empiricism and realism.
- Full Text:
- Date Issued: 1979
- Authors: Schwerin, Alan Kenneth
- Date: 1979
- Subjects: Science -- Philosophy , Logical positivism , Realism
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2701 , http://hdl.handle.net/10962/d1001976
- Description: In this essay I have considered some of the philosophical problems involved in attempting to settle the question, What are scientific theories about? And in order to expose these problems, I have dealt with two influential responses to this question of the referents of scientific theories - namely, logical empiricism and realism.
- Full Text:
- Date Issued: 1979
Modelling annual evapotranspiration in a semi-arid, African savanna: functional convergence theory, MODIS LAI and the Penman–Monteith equation
- Palmer, Anthony R, Weideman, Craig I, Finca, Andiswa, Everson, Colin S, Hanan, Niall P, Ellery, William F N
- Authors: Palmer, Anthony R , Weideman, Craig I , Finca, Andiswa , Everson, Colin S , Hanan, Niall P , Ellery, William F N
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144387 , vital:38341 , DOI: 10.2989/10220119.2014.931305
- Description: Accurately measuring evapotranspiration (ET) is essential if we are to derive reasonable estimates of production and water use for semi-arid savannas. Estimates of ET are also important in defining the health of an ecosystem and the quantity of water used by the vegetation when preparing a catchment-scale water balance. We derived ET0 from an automatic weather station 30 km west of Skukuza, Kruger National Park, South Africa using the Penman– Monteith equation, and then used the MODIS LAI to inform the model of canopy phenological dynamics. This result was compared with 173 days of ET measurements from the eddy covariance (ETec) system near Skukuza in 2007 as well as from the ET recorded by a large-aperture scintillometer at the same site in 2005. The model compared favourably with both sets of measured data and, when used independently of the eddy covariance data, ETMODIS predicted an annual ET of 378 mm in 2007 for the semi-arid savanna around the Skukuza flux site.
- Full Text:
- Date Issued: 2014
- Authors: Palmer, Anthony R , Weideman, Craig I , Finca, Andiswa , Everson, Colin S , Hanan, Niall P , Ellery, William F N
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144387 , vital:38341 , DOI: 10.2989/10220119.2014.931305
- Description: Accurately measuring evapotranspiration (ET) is essential if we are to derive reasonable estimates of production and water use for semi-arid savannas. Estimates of ET are also important in defining the health of an ecosystem and the quantity of water used by the vegetation when preparing a catchment-scale water balance. We derived ET0 from an automatic weather station 30 km west of Skukuza, Kruger National Park, South Africa using the Penman– Monteith equation, and then used the MODIS LAI to inform the model of canopy phenological dynamics. This result was compared with 173 days of ET measurements from the eddy covariance (ETec) system near Skukuza in 2007 as well as from the ET recorded by a large-aperture scintillometer at the same site in 2005. The model compared favourably with both sets of measured data and, when used independently of the eddy covariance data, ETMODIS predicted an annual ET of 378 mm in 2007 for the semi-arid savanna around the Skukuza flux site.
- Full Text:
- Date Issued: 2014
What literature? : inaugural lecture delivered at Rhodes University
- Authors: Van Wyk Smith, Malvern
- Date: 1981
- Language: English
- Type: Text
- Identifier: vital:676 , http://hdl.handle.net/10962/d1020745 , ISBN 0868100692
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1981
- Authors: Van Wyk Smith, Malvern
- Date: 1981
- Language: English
- Type: Text
- Identifier: vital:676 , http://hdl.handle.net/10962/d1020745 , ISBN 0868100692
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1981
Apneic Bradycardia : terrestrial and aquatic responses in man under working conditions
- Authors: Manley, Elizabeth
- Date: 1989
- Subjects: Apnea Respiration -- Measurement Heart rate monitoring Work -- Physiological aspects Underwater -- Physiology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5098 , http://hdl.handle.net/10962/d1001838
- Description: The focus of this research was the reappraisal in physiological and psychophysical terms of current equivocal theories regarding the onset, course and termination of apneic bradycardia. Sixteen healthy male subjects participated in four separate testing sessions . Maximal oxygen consumption (VO₂ max) was measured on land and underwater using an identical direct, continuous progressive cycle ergometer test. On each of two other occasions subjects exercised in either environment at 50, 70 and 90% of the appropriate VO₂ max, during which time heart rate was continuously recorded. An initial apneic bout at each exercise intensity was followed by performance of the same workload without apnea for an equivalent period of time. Ratings of perceived exertion (RPE) were also monitored. While apneic bradycardia occurred at each exercise intensity studied underwater, it was apparent only at 50% VO₂ max on land. With the exception of between 50 and 90% VO₂ max on land, the mean apneic heart rates did not differ with varying exercise intensity (p<0.05); nor did the lowest heart rate recorded, although this was lower underwater than on land. Apart from 70% VO₂ max on land, apneic heart rates were lower than the equivalent values measured during exercise without apnea. Land and underwater heart rates during apneic and non-apneic conditions did not differ until 90% VO₂ max. The effects of increasing exercise intensity upon the onset of bradycardia were evident in that it occurred earlier at 50% VO₂ max underwater than at the heavier workloads, and only at 50% VO₂ max on land. The mean breath-hold duration did not differ between the land and underwater environments, nor was it affected by increasing exercise intensity. The order in which breath-holds was performed did not alter the length of apnea. Land and underwater RPE did not differ and increased with increasing exercise intensity in both environments. During apneic exercise RPE was greater than the equivalent exercise without apnea. Twelve of the original 16 subjects were divided equally into two groups on the basis of vital capacity expressed relative to body surface area. Vital capacity was measured during the first laboratory session. Neither the mean heart rate response to apneic exercise at 50% V0₂ max in both environments, nor the lowest heart rates recorded differed between groups, prompting the conclusion that lung volume did not affect apneic bradycardia. Despite a longer breath-hold duration for Group A (large relative lung volume) than Group B (small relative lung volume), the onset point of bradycardia was the same for either group when expressed relative to total breath-hold duration
- Full Text:
- Date Issued: 1989
- Authors: Manley, Elizabeth
- Date: 1989
- Subjects: Apnea Respiration -- Measurement Heart rate monitoring Work -- Physiological aspects Underwater -- Physiology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5098 , http://hdl.handle.net/10962/d1001838
- Description: The focus of this research was the reappraisal in physiological and psychophysical terms of current equivocal theories regarding the onset, course and termination of apneic bradycardia. Sixteen healthy male subjects participated in four separate testing sessions . Maximal oxygen consumption (VO₂ max) was measured on land and underwater using an identical direct, continuous progressive cycle ergometer test. On each of two other occasions subjects exercised in either environment at 50, 70 and 90% of the appropriate VO₂ max, during which time heart rate was continuously recorded. An initial apneic bout at each exercise intensity was followed by performance of the same workload without apnea for an equivalent period of time. Ratings of perceived exertion (RPE) were also monitored. While apneic bradycardia occurred at each exercise intensity studied underwater, it was apparent only at 50% VO₂ max on land. With the exception of between 50 and 90% VO₂ max on land, the mean apneic heart rates did not differ with varying exercise intensity (p<0.05); nor did the lowest heart rate recorded, although this was lower underwater than on land. Apart from 70% VO₂ max on land, apneic heart rates were lower than the equivalent values measured during exercise without apnea. Land and underwater heart rates during apneic and non-apneic conditions did not differ until 90% VO₂ max. The effects of increasing exercise intensity upon the onset of bradycardia were evident in that it occurred earlier at 50% VO₂ max underwater than at the heavier workloads, and only at 50% VO₂ max on land. The mean breath-hold duration did not differ between the land and underwater environments, nor was it affected by increasing exercise intensity. The order in which breath-holds was performed did not alter the length of apnea. Land and underwater RPE did not differ and increased with increasing exercise intensity in both environments. During apneic exercise RPE was greater than the equivalent exercise without apnea. Twelve of the original 16 subjects were divided equally into two groups on the basis of vital capacity expressed relative to body surface area. Vital capacity was measured during the first laboratory session. Neither the mean heart rate response to apneic exercise at 50% V0₂ max in both environments, nor the lowest heart rates recorded differed between groups, prompting the conclusion that lung volume did not affect apneic bradycardia. Despite a longer breath-hold duration for Group A (large relative lung volume) than Group B (small relative lung volume), the onset point of bradycardia was the same for either group when expressed relative to total breath-hold duration
- Full Text:
- Date Issued: 1989
Guibourtacacidin: a new Leuco-anthocyanidin from Rhodesian copalwood; (Guibourtia coleosperma)
- Authors: De Bruyn, Guustaaf Cornelis
- Date: 1962
- Subjects: Phanerogams , Angiosperms , Flavonoids , Anthocyanidins
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4459 , http://hdl.handle.net/10962/d1011043
- Description: A new leuco-anthocyanidin, (+)-7,4'dihydroxyflavan- 3:4-diol has been isolated from the heartwood of Guibourtia coleosperma. The heartwood extractives were fractionated by enrichment procedures involving fractional precipitation and Craig partitioning, to give a high RF (subscript) low molecular weight fraction containing the above leuco -anthocyanidin. This was further fractionated by "preparative" paper chromatography . The leuco-anthocyanidin was amorphous and present in low proportion (0.004%) in the wood. On boiling with alcoholic hydrochloric acid the compound gave an anthocyanidin which was identified as 3,7,4'-trihydroxyflavylium chloride. The degradation products formed by alkali fusion, on a micro-scale, were resorcinol and ♭-resorcylic acid, and also p (underscore)-hydroxybenzoic acid. This indicated resorcinol and phenol A and B nuclei respectively. The formation of amorphous dimethyl ether and tetra-acetoxy derivatives indicated two phenolic and two alcoholic hydroxyl groups. The above indicates that the compound was 7,4'-dihydroxyflavan- 3:4- diol and a molecular weight estimation showed it to be monomeric. Comparison of the infrared absorption spectra of the natural dimethyl ether with synthetic (±) dimethoxyflavan- 3:4-diol, to which a tentative 2:3- trans- 3:4-cis conformation had been assigned (Phatak and Kulkarni 94), showed close identity. Crystalline (±)-7, 4 '-dihydroxyflavan- 3:4 - diol was synthesised by catalytic hydrogenation over platinum oxide of the corresponoing (±) -7,4'-dihydroxyflavanonol. The flavanonol was synthesised by sodium hyposulphite reduction of the 7,4 ' -dihydroxyflavonol. The infrared absorption spectra of the natural and synthetic diols were similar but not identical. Chromatographic evidence showed the apparent identity of the synthetic and natural flavan- 3:4- diols, and two possible configurations were assigned for the natural flavan-3:4-diol. The new leuco-anthocyanidin was observed to form an O(underscore)-ethyl ether derivative on manipulation in ethanol. A monomeric leuco- fisetinidin from the heartwood was identified, by two dimensional paper chromatography, as (+) - mollisacacidin. The condensed tannins found also in the heartwood of G.(underscore)- coleosperma appear to be polymeric forms of leuco - fisetinidin and leuco - guibourtinidin. These polymeric tannins form a large proportion of the heartwood extractives and furnish high yields of fisetinidin and guibourtinidin chlorides on boiling with alcoholic hydrochloric acid. Examination of some other members of the Guibourtia spp . by paper chromatography showed that only G (underscore). coleosperma contained the new leuco - anthocyanidin as well as a leuco - fisetinidin. G. (underscore) tessmannii and G. (underscore) demeusii heartwoods contained only leuco-fisetinidin and the related polymers and a close chemical relationship to G.(underscore) coleosperma is thus apparent. G.(underscore) arnoldiana on the other hand is not chemically interrelated with the above members since it appeared to contain only leuco - cyanidin. (±) - 7,4 ' -Dihydroxyflavan- 4-ol was synthesised by hydrogenation of the corresponding flavanone over platinum oxide. Observations were made regarding its reddenig and ease of condensation.
- Full Text:
- Date Issued: 1962
- Authors: De Bruyn, Guustaaf Cornelis
- Date: 1962
- Subjects: Phanerogams , Angiosperms , Flavonoids , Anthocyanidins
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4459 , http://hdl.handle.net/10962/d1011043
- Description: A new leuco-anthocyanidin, (+)-7,4'dihydroxyflavan- 3:4-diol has been isolated from the heartwood of Guibourtia coleosperma. The heartwood extractives were fractionated by enrichment procedures involving fractional precipitation and Craig partitioning, to give a high RF (subscript) low molecular weight fraction containing the above leuco -anthocyanidin. This was further fractionated by "preparative" paper chromatography . The leuco-anthocyanidin was amorphous and present in low proportion (0.004%) in the wood. On boiling with alcoholic hydrochloric acid the compound gave an anthocyanidin which was identified as 3,7,4'-trihydroxyflavylium chloride. The degradation products formed by alkali fusion, on a micro-scale, were resorcinol and ♭-resorcylic acid, and also p (underscore)-hydroxybenzoic acid. This indicated resorcinol and phenol A and B nuclei respectively. The formation of amorphous dimethyl ether and tetra-acetoxy derivatives indicated two phenolic and two alcoholic hydroxyl groups. The above indicates that the compound was 7,4'-dihydroxyflavan- 3:4- diol and a molecular weight estimation showed it to be monomeric. Comparison of the infrared absorption spectra of the natural dimethyl ether with synthetic (±) dimethoxyflavan- 3:4-diol, to which a tentative 2:3- trans- 3:4-cis conformation had been assigned (Phatak and Kulkarni 94), showed close identity. Crystalline (±)-7, 4 '-dihydroxyflavan- 3:4 - diol was synthesised by catalytic hydrogenation over platinum oxide of the corresponoing (±) -7,4'-dihydroxyflavanonol. The flavanonol was synthesised by sodium hyposulphite reduction of the 7,4 ' -dihydroxyflavonol. The infrared absorption spectra of the natural and synthetic diols were similar but not identical. Chromatographic evidence showed the apparent identity of the synthetic and natural flavan- 3:4- diols, and two possible configurations were assigned for the natural flavan-3:4-diol. The new leuco-anthocyanidin was observed to form an O(underscore)-ethyl ether derivative on manipulation in ethanol. A monomeric leuco- fisetinidin from the heartwood was identified, by two dimensional paper chromatography, as (+) - mollisacacidin. The condensed tannins found also in the heartwood of G.(underscore)- coleosperma appear to be polymeric forms of leuco - fisetinidin and leuco - guibourtinidin. These polymeric tannins form a large proportion of the heartwood extractives and furnish high yields of fisetinidin and guibourtinidin chlorides on boiling with alcoholic hydrochloric acid. Examination of some other members of the Guibourtia spp . by paper chromatography showed that only G (underscore). coleosperma contained the new leuco - anthocyanidin as well as a leuco - fisetinidin. G. (underscore) tessmannii and G. (underscore) demeusii heartwoods contained only leuco-fisetinidin and the related polymers and a close chemical relationship to G.(underscore) coleosperma is thus apparent. G.(underscore) arnoldiana on the other hand is not chemically interrelated with the above members since it appeared to contain only leuco - cyanidin. (±) - 7,4 ' -Dihydroxyflavan- 4-ol was synthesised by hydrogenation of the corresponding flavanone over platinum oxide. Observations were made regarding its reddenig and ease of condensation.
- Full Text:
- Date Issued: 1962
Stuffed birds on trees: an historical review of avian systematics in southern Africa
- Authors: Craig, Adrian J F K
- Date: 2000
- Language: English
- Type: Article
- Identifier: vital:6931 , http://hdl.handle.net/10962/d1011949
- Description: Avian systematics in southern Africa has been heavily dependent on a small number of museum-based specialists. They produced bird checklists which prescribed the names to be used by other scientists. After an initial phase of cataloguing the avifauna, a major preoccupation was the description of geographical variation, which was documented in an extensive subspecific nomenclature. Until recent years, few African ornithologists have been involved in systematics as a biological discipline. This historical overview considers the contribution of particular individuals from Andrew Smith to Phillip Clancey.
- Full Text: false
- Date Issued: 2000
- Authors: Craig, Adrian J F K
- Date: 2000
- Language: English
- Type: Article
- Identifier: vital:6931 , http://hdl.handle.net/10962/d1011949
- Description: Avian systematics in southern Africa has been heavily dependent on a small number of museum-based specialists. They produced bird checklists which prescribed the names to be used by other scientists. After an initial phase of cataloguing the avifauna, a major preoccupation was the description of geographical variation, which was documented in an extensive subspecific nomenclature. Until recent years, few African ornithologists have been involved in systematics as a biological discipline. This historical overview considers the contribution of particular individuals from Andrew Smith to Phillip Clancey.
- Full Text: false
- Date Issued: 2000
Where have all the fathers gone? Media(ted) representations of fatherhood.
- Authors: Prinsloo, J
- Date: 2006
- Language: English
- Type: Book review
- Identifier: vital:530 , http://hdl.handle.net/10962/d1008483
- Description: [From the introduction]: "It is in the mundane world that media operate most significantly. They filter and frame everyday realities, through their singular and multiple representations, providing touchstones, references, for the conduct of everyday life, for the production and maintenance of common-sense (Silverstone 1999, p.6). While it is broadly accepted that the media do not reflect society, they do provide us with a repertoire of roles and images which we encounter and with which we engage." As the opening quote suggests, the media play a vital role in the circulation and mediation of ideas, attitudes and actions and their significance is commented on frequently. It is noteworthy that such commentary in South Africa identifies that men are infrequently depicted in parental roles. This is in comparison to the other roles men inhabit and in contrast to the role of women as mother. It is also suggested that the macho masculine identities that the media offer serve as proxy father roles.
- Full Text:
- Date Issued: 2006
- Authors: Prinsloo, J
- Date: 2006
- Language: English
- Type: Book review
- Identifier: vital:530 , http://hdl.handle.net/10962/d1008483
- Description: [From the introduction]: "It is in the mundane world that media operate most significantly. They filter and frame everyday realities, through their singular and multiple representations, providing touchstones, references, for the conduct of everyday life, for the production and maintenance of common-sense (Silverstone 1999, p.6). While it is broadly accepted that the media do not reflect society, they do provide us with a repertoire of roles and images which we encounter and with which we engage." As the opening quote suggests, the media play a vital role in the circulation and mediation of ideas, attitudes and actions and their significance is commented on frequently. It is noteworthy that such commentary in South Africa identifies that men are infrequently depicted in parental roles. This is in comparison to the other roles men inhabit and in contrast to the role of women as mother. It is also suggested that the macho masculine identities that the media offer serve as proxy father roles.
- Full Text:
- Date Issued: 2006
An emancipatory approach for innovative access to education in farm schools of the Eastern Cape, South Africa
- Authors: Robinson, Craig Grant
- Date: 2019
- Language: English
- Type: text , Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/72462 , vital:30055
- Description: Expected release date-April 2020
- Full Text: false
- Date Issued: 2019
- Authors: Robinson, Craig Grant
- Date: 2019
- Language: English
- Type: text , Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/72462 , vital:30055
- Description: Expected release date-April 2020
- Full Text: false
- Date Issued: 2019