Exploring how Grade 11 Physical Science learners make sense of the concept of rates of reactions through the inclusion of the indigenous practice of making oshikundu: a Namibian case study
- Nikodemus, Kristof Shingwilila
- Authors: Nikodemus, Kristof Shingwilila
- Date: 2017
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/8154 , vital:21360
- Description: It has been observed that the teaching and learning of the concept of rates of reactions is seen as being difficult for most Namibian learners. Concerns have been expressed in Examiners’ Reports about candidates showing little knowledge of the topic ‘rates of reactions’. Hence, this study sought to explore how indigenous knowledge and practices through a practical activity of making oshikundu, enabled or constrained learner-engagement and sense-making of the concept of rates of reactions in Namibian schools. Underpinned by an interpretive paradigm, the study tried to describe and understand how learners make sense of their world. Within the interpretive paradigm, a mixed-method case study approach was adopted. It is informed by Vygotsky’s socio-cultural theory, which recognises that learning and meaning-making are represented as originating from social interactions among individuals. The research study was conducted in a rural secondary school in the northern part of Namibia with Grade 11 Physical Science learners. Purposive sampling techniques were used to select three learners from the class, as the interview sample. A pre-test was used to gather data on the type of prior knowledge that Grade 11 Physical Science learners had of concepts related to rates of reactions. The pre-test’s content was validated by two Physical Science specialists. Observations were used to explore how learners make sense of rates of reactions during lessons. In addition to observations, interviews and a post-test were used in order to gather data on how the practical activity of making oshikundu enabled or constrained Grade 11 Physical Science: (a) learner engagement and (b) sense-making of the concept of rates of reactions. The findings of the study found that learners were more engaged and participated more fully in class than in previous year when the indigenous practice of making oshikundu was incorporated during the science lessons. The study thus recommends that indigenous knowledge and practices be integrated into Physical Science classrooms for effective teaching and learning and sense making of science concepts.
- Full Text:
- Date Issued: 2017
- Authors: Nikodemus, Kristof Shingwilila
- Date: 2017
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/8154 , vital:21360
- Description: It has been observed that the teaching and learning of the concept of rates of reactions is seen as being difficult for most Namibian learners. Concerns have been expressed in Examiners’ Reports about candidates showing little knowledge of the topic ‘rates of reactions’. Hence, this study sought to explore how indigenous knowledge and practices through a practical activity of making oshikundu, enabled or constrained learner-engagement and sense-making of the concept of rates of reactions in Namibian schools. Underpinned by an interpretive paradigm, the study tried to describe and understand how learners make sense of their world. Within the interpretive paradigm, a mixed-method case study approach was adopted. It is informed by Vygotsky’s socio-cultural theory, which recognises that learning and meaning-making are represented as originating from social interactions among individuals. The research study was conducted in a rural secondary school in the northern part of Namibia with Grade 11 Physical Science learners. Purposive sampling techniques were used to select three learners from the class, as the interview sample. A pre-test was used to gather data on the type of prior knowledge that Grade 11 Physical Science learners had of concepts related to rates of reactions. The pre-test’s content was validated by two Physical Science specialists. Observations were used to explore how learners make sense of rates of reactions during lessons. In addition to observations, interviews and a post-test were used in order to gather data on how the practical activity of making oshikundu enabled or constrained Grade 11 Physical Science: (a) learner engagement and (b) sense-making of the concept of rates of reactions. The findings of the study found that learners were more engaged and participated more fully in class than in previous year when the indigenous practice of making oshikundu was incorporated during the science lessons. The study thus recommends that indigenous knowledge and practices be integrated into Physical Science classrooms for effective teaching and learning and sense making of science concepts.
- Full Text:
- Date Issued: 2017
Exploring rural parents’ attitudes and experiences towards teaching and learning of the topics of human reproduction in junior secondary schools: a Namibian case study
- Authors: Kavila, Kornelius Embumbulu
- Date: 2017
- Subjects: Human reproduction -- Study and teaching (Secondary) -- Namibia , Parents -- Namibia -- Attitudes , Sex instruction for teenagers -- Namibia , Sexual health -- Study and teaching -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/13543 , vital:21836
- Description: The Namibian school curriculum mandates that the subject of Life Science should be taught in all schools from grade 8-10. Among the main themes in this subject is Human Biology which covers topics of human reproduction. According to the Junior Secondary Certificate JSC Life Science Examiners’ reports (2010-2015), and my personal experience, learners perform poorly in the topics of human reproduction. Many of the parents in Namibian communities are not comfortable talking to their children about their sexuality, and some believe that communication about sexuality could influence adolescents to become more sexually active (Silas, 2015). Yet, there is agreement among educationists that parents’ involvement in their children’s education has an impact on the mediation of concepts, skills and attitudes. It is against this backdrop that this study explored rural parents’ attitudes and experiences towards teaching and learning of the topics of human reproduction being taught to their children in junior secondary schools (Grade 8-10). This study was informed by Vygotsky’s socio-cultural theory with the focus on how adults and peers influence individual learning and how cultural beliefs impact on instruction and learning in science classrooms. The sociocultural theory was supplemented by the Feminist Standpoint Theory (FST) with the focus on how different knowledge systems and standpoints produced from a specific social community (that is, rural parents) in terms of who to say what and when, to whom regarding sex-related information. The study was located within the interpretive paradigm. Within an interpretive paradigm, a case study approach was employed. This case study used a mixed method approach, that is, both quantitative and qualitative data were gathered to help understand the subjective nature of human’s attitudes and experiences. Data were collected using an administered questionnaire with twenty-two rural parents, workshop observation and semi-structured interviews with four of the twenty-two participated parents. Additionally, data from documents such as textbooks and curriculum documents were used to strengthen the context of this study. The study provided valuable information regarding issues around discussions about sex education. It revealed that the majority of rural parents regard sexual health education a taboo. However, the majority are of the supportive attitude towards sexual health education. The study provided some insights on the factors that influence rural parents’ attitude and experiences towards sexual health education. It was also found that parent-child communication is an essential skill, which needs to be developed either through parents’ workshops or other means to support and empower parents to understand the importance of teaching and learning about sexual health issues. It is also recommended to empower and support parents on how to talk to their children about sexual health issues.
- Full Text:
- Date Issued: 2017
- Authors: Kavila, Kornelius Embumbulu
- Date: 2017
- Subjects: Human reproduction -- Study and teaching (Secondary) -- Namibia , Parents -- Namibia -- Attitudes , Sex instruction for teenagers -- Namibia , Sexual health -- Study and teaching -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/13543 , vital:21836
- Description: The Namibian school curriculum mandates that the subject of Life Science should be taught in all schools from grade 8-10. Among the main themes in this subject is Human Biology which covers topics of human reproduction. According to the Junior Secondary Certificate JSC Life Science Examiners’ reports (2010-2015), and my personal experience, learners perform poorly in the topics of human reproduction. Many of the parents in Namibian communities are not comfortable talking to their children about their sexuality, and some believe that communication about sexuality could influence adolescents to become more sexually active (Silas, 2015). Yet, there is agreement among educationists that parents’ involvement in their children’s education has an impact on the mediation of concepts, skills and attitudes. It is against this backdrop that this study explored rural parents’ attitudes and experiences towards teaching and learning of the topics of human reproduction being taught to their children in junior secondary schools (Grade 8-10). This study was informed by Vygotsky’s socio-cultural theory with the focus on how adults and peers influence individual learning and how cultural beliefs impact on instruction and learning in science classrooms. The sociocultural theory was supplemented by the Feminist Standpoint Theory (FST) with the focus on how different knowledge systems and standpoints produced from a specific social community (that is, rural parents) in terms of who to say what and when, to whom regarding sex-related information. The study was located within the interpretive paradigm. Within an interpretive paradigm, a case study approach was employed. This case study used a mixed method approach, that is, both quantitative and qualitative data were gathered to help understand the subjective nature of human’s attitudes and experiences. Data were collected using an administered questionnaire with twenty-two rural parents, workshop observation and semi-structured interviews with four of the twenty-two participated parents. Additionally, data from documents such as textbooks and curriculum documents were used to strengthen the context of this study. The study provided valuable information regarding issues around discussions about sex education. It revealed that the majority of rural parents regard sexual health education a taboo. However, the majority are of the supportive attitude towards sexual health education. The study provided some insights on the factors that influence rural parents’ attitude and experiences towards sexual health education. It was also found that parent-child communication is an essential skill, which needs to be developed either through parents’ workshops or other means to support and empower parents to understand the importance of teaching and learning about sexual health issues. It is also recommended to empower and support parents on how to talk to their children about sexual health issues.
- Full Text:
- Date Issued: 2017
A stratigraphic, petrographic and geochemical study of the gamagara formation at the maremane dome, Northern Cape province, South Africa
- Authors: Cousins, David Patrick
- Date: 2017
- Subjects: Iron ores -- Geology -- South Africa -- Northern Cape , Geology -- South Africa -- Northern Cape , Mineralogy -- South Africa -- Northern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4679 , vital:20711
- Description: Between 80 and 90 percent of the potential iron ore reserves in the Griqualand West basin in the Northern Cape province of South Africa is situated in the Asbesheuwels Iron-formation immediately below an unconformity that separates it from the Gamagara Formation of the Olifantshoek Supergroup. This extensive regional unconformity marks a lengthy period of non-deposition and erosion which preceded the deposition of the Gamagara Formation. Due to the nature of the intimate relationship between the shales and iron ore body, specifically on the Maremane dome, new insights into the Gamagara Formation were required. The thesis provides a renewed stratigraphic, petrographic and geochemical study on the Gamagara Formation and relates it to previous studies done on the lateral correlative Mapedi Formation, some 70 km north of the Maremane dome. The use of 10 newly available drill-cores selected from across the Maremane Dome allows for regional correlations to be made in a study which employs petrographic/mineralogical investigations using transmitted/reflected light microscopy, XRD and EPMA, complimented by traditional whole-rock geochemical analysis of majors, traces, rare earth elements and Nd isotopes. At the base of the Gamagara lie conglomerates representing an alluvial fan deposit, overlying this, shale and quartzite successions represent progradational delta lobes. The deltas are interpreted to be tide- dominated as indicated by a combination of features including: microbial mat growth, intertidal deposition in the delta top, sand bars and flaser laminations in the upward coarsening quartzite units of the delta front. Transgression is indicated by periodic transgressive lag deposits. A variety of sedimentary structures and textural features are described that can be interpreted as the results of microbial mat colonization on the sediment surface. Although in none of the described features can it irrefutably be proven that they are microbial mat deposits, the observed features are consistent with such an interpretation and should be considered indicators of possible microbial mat presence in the Gamagara Formation. Hydrothermal modifications are identified in various units of the Gamagara Formation and seem to occur as separate events. Basal white shales show mobility of Al and slight HFSE enrichments, while overlying red shales record HFSE, K and Fe enrichments. K-metasomatism has been known to occur in the underlying paleoweathering profile of the Transvaal Supergroup (Ongeluk lavas) a unit which is interpreted as the most likely provenance for the mid-to-upper shale lithofacies of the Gamagara Formation. Highly alkaline F-bearing brines had the ability to mobilize titania and fluorapatite, reset Nd isotope systematics and ultimately enriched HFSE concentrations in the red shales of the Gamagara Formation. As the same enrichment is evident in the Mapedi Formation, the event possibly represents unconformity related fluid flow on a regional scale (~140 km). Nd-isotopes record an isotopic disturbance concurrent with the HFSE enrichment and Tdm model ages suggest disruption (and enrichment) occurred between 1.73 and 1.86 Ga. Following this, Fe-addition occurred by epigenetic mechanisms similar to those of MVT-type deposits. Although gaps in the current understanding of the modifications of the Gamagara Formation exist, such events may have far reaching implications for the underlying iron ore bodies and the possibility arises that the genesis and/or epigenetic modification of the ore bodies of the Transvaal Supergroup may be casually linked to the same fluid-migration event/s.
- Full Text:
- Date Issued: 2017
- Authors: Cousins, David Patrick
- Date: 2017
- Subjects: Iron ores -- Geology -- South Africa -- Northern Cape , Geology -- South Africa -- Northern Cape , Mineralogy -- South Africa -- Northern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4679 , vital:20711
- Description: Between 80 and 90 percent of the potential iron ore reserves in the Griqualand West basin in the Northern Cape province of South Africa is situated in the Asbesheuwels Iron-formation immediately below an unconformity that separates it from the Gamagara Formation of the Olifantshoek Supergroup. This extensive regional unconformity marks a lengthy period of non-deposition and erosion which preceded the deposition of the Gamagara Formation. Due to the nature of the intimate relationship between the shales and iron ore body, specifically on the Maremane dome, new insights into the Gamagara Formation were required. The thesis provides a renewed stratigraphic, petrographic and geochemical study on the Gamagara Formation and relates it to previous studies done on the lateral correlative Mapedi Formation, some 70 km north of the Maremane dome. The use of 10 newly available drill-cores selected from across the Maremane Dome allows for regional correlations to be made in a study which employs petrographic/mineralogical investigations using transmitted/reflected light microscopy, XRD and EPMA, complimented by traditional whole-rock geochemical analysis of majors, traces, rare earth elements and Nd isotopes. At the base of the Gamagara lie conglomerates representing an alluvial fan deposit, overlying this, shale and quartzite successions represent progradational delta lobes. The deltas are interpreted to be tide- dominated as indicated by a combination of features including: microbial mat growth, intertidal deposition in the delta top, sand bars and flaser laminations in the upward coarsening quartzite units of the delta front. Transgression is indicated by periodic transgressive lag deposits. A variety of sedimentary structures and textural features are described that can be interpreted as the results of microbial mat colonization on the sediment surface. Although in none of the described features can it irrefutably be proven that they are microbial mat deposits, the observed features are consistent with such an interpretation and should be considered indicators of possible microbial mat presence in the Gamagara Formation. Hydrothermal modifications are identified in various units of the Gamagara Formation and seem to occur as separate events. Basal white shales show mobility of Al and slight HFSE enrichments, while overlying red shales record HFSE, K and Fe enrichments. K-metasomatism has been known to occur in the underlying paleoweathering profile of the Transvaal Supergroup (Ongeluk lavas) a unit which is interpreted as the most likely provenance for the mid-to-upper shale lithofacies of the Gamagara Formation. Highly alkaline F-bearing brines had the ability to mobilize titania and fluorapatite, reset Nd isotope systematics and ultimately enriched HFSE concentrations in the red shales of the Gamagara Formation. As the same enrichment is evident in the Mapedi Formation, the event possibly represents unconformity related fluid flow on a regional scale (~140 km). Nd-isotopes record an isotopic disturbance concurrent with the HFSE enrichment and Tdm model ages suggest disruption (and enrichment) occurred between 1.73 and 1.86 Ga. Following this, Fe-addition occurred by epigenetic mechanisms similar to those of MVT-type deposits. Although gaps in the current understanding of the modifications of the Gamagara Formation exist, such events may have far reaching implications for the underlying iron ore bodies and the possibility arises that the genesis and/or epigenetic modification of the ore bodies of the Transvaal Supergroup may be casually linked to the same fluid-migration event/s.
- Full Text:
- Date Issued: 2017
Mineralogical and geochemical constraints on the origin, alteration history and metallogenic significance of the Manganore iron-formation, Northern Cape Province, South Africa
- Authors: Papadopoulos, Vlassis
- Date: 2017
- Subjects: Banded iron formation , Transvaal Supergroup (South Africa) , Groups (Stratigraphy) South Africa , Lithostratigraphy , Petrology South Africa , Geochemistry South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65189 , vital:28702
- Description: The Manganore iron-formation (MIF) of the Transvaal Supergroup is host to the most important high-grade iron ore bodies in South Africa. Prevailing models for ore genesis invoke supergene processes performing during a long period of erosion, oxidation and weathering under tropical lateritic conditions while the role of potential hydrothermal processes is not addressed. Lack of detailed petrographical and geochemical data necessitated reexamination of the MIF through new and existing drill core exploration material. Thorough petrographical investigation revealed a multi-event complex alteration history involving hydrothermal activity. Iron and silica mobility during alteration is demonstrated by a series of replacement, overprinting, crosscutting textures, extensive silicification and hematitization. Metasomatized textures such as pseudomorphs of primary magnetite, carbonate minerals and chert pods/lenses point to an alteration occurring in layer- controlled fronts and link stratigraphically the MIF to Kuruman and Griquatown iron- formations. Whole-rock geochemical data verify textural observations suggesting strong enrichment of iron or silica in meter-scale horizons, expressed by different generations of quartz and hematite. High-grade iron ore is highly enriched in TiO2 and Al2O3 compared to the protolith while both BIF and iron ore display highly increased concentrations of trace elements (transition metals and HFSE). Oxygen isotopes from different quartz textures reveal little to none isotopic exchangement during alteration whereas O isotopes from hematite are in concert to values from literature and suggest two different generations of hematite. A total of 20 minerals apart from quartz and hematite were documented. An earlier alkali/HFSE alteration event that is believed to have affected the overlying Gamagara shales is recorded in the BIF by the presence of muscovite, apatite, rutile, zircon and xenotime. A later and possibly ongoing event of succeeding hydrothermal pulses involves mainly sulphates (gypsum, baryte, celestine), pyrite, carbonates (siderite, calcite) and silicates (berthierine and tourmaline). Alkali-bearing brines persistently exploit the BIF mainly through karstification-related secondary porosity, are evidently carrying iron and are proposed to participate in or control the iron enrichment by facilitating removal of silica. The source of metals, sulfur and carbon is attributed to the underlying Campbellrand dolomites and especially to the upper Gamogaan Formation. The unconformable contact between BIF and the overlying shales is suggested as a suitable fluid conduit for the development of the observed BIF and shale-derived high-grade hematite iron ore.
- Full Text:
- Date Issued: 2017
- Authors: Papadopoulos, Vlassis
- Date: 2017
- Subjects: Banded iron formation , Transvaal Supergroup (South Africa) , Groups (Stratigraphy) South Africa , Lithostratigraphy , Petrology South Africa , Geochemistry South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65189 , vital:28702
- Description: The Manganore iron-formation (MIF) of the Transvaal Supergroup is host to the most important high-grade iron ore bodies in South Africa. Prevailing models for ore genesis invoke supergene processes performing during a long period of erosion, oxidation and weathering under tropical lateritic conditions while the role of potential hydrothermal processes is not addressed. Lack of detailed petrographical and geochemical data necessitated reexamination of the MIF through new and existing drill core exploration material. Thorough petrographical investigation revealed a multi-event complex alteration history involving hydrothermal activity. Iron and silica mobility during alteration is demonstrated by a series of replacement, overprinting, crosscutting textures, extensive silicification and hematitization. Metasomatized textures such as pseudomorphs of primary magnetite, carbonate minerals and chert pods/lenses point to an alteration occurring in layer- controlled fronts and link stratigraphically the MIF to Kuruman and Griquatown iron- formations. Whole-rock geochemical data verify textural observations suggesting strong enrichment of iron or silica in meter-scale horizons, expressed by different generations of quartz and hematite. High-grade iron ore is highly enriched in TiO2 and Al2O3 compared to the protolith while both BIF and iron ore display highly increased concentrations of trace elements (transition metals and HFSE). Oxygen isotopes from different quartz textures reveal little to none isotopic exchangement during alteration whereas O isotopes from hematite are in concert to values from literature and suggest two different generations of hematite. A total of 20 minerals apart from quartz and hematite were documented. An earlier alkali/HFSE alteration event that is believed to have affected the overlying Gamagara shales is recorded in the BIF by the presence of muscovite, apatite, rutile, zircon and xenotime. A later and possibly ongoing event of succeeding hydrothermal pulses involves mainly sulphates (gypsum, baryte, celestine), pyrite, carbonates (siderite, calcite) and silicates (berthierine and tourmaline). Alkali-bearing brines persistently exploit the BIF mainly through karstification-related secondary porosity, are evidently carrying iron and are proposed to participate in or control the iron enrichment by facilitating removal of silica. The source of metals, sulfur and carbon is attributed to the underlying Campbellrand dolomites and especially to the upper Gamogaan Formation. The unconformable contact between BIF and the overlying shales is suggested as a suitable fluid conduit for the development of the observed BIF and shale-derived high-grade hematite iron ore.
- Full Text:
- Date Issued: 2017
Post-release evaluation of the biological control programme against Cereus jamacaru De Candolle (Cactaceae), in South Africa
- Authors: Sutton, Guy Frederick
- Date: 2017
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/7982 , vital:21330
- Description: Cereus jamacaru De Candolle (Cactaceae) is an environment-transforming weed of both agricultural and wildlife habitats in South Africa. Weed infestations reduce carrying capacity of the land, and pose a risk to livestock, wildlife and human safety due to the plant’s spiny thorns. The weed is considered to be under complete biological control in South Africa, due to its introduced control agent, Hypogeococcus festerianus Lizer y Trelles (Hemiptera: Pseudococcidae), although observational reports suggest that the level of success achieved is variable. In this thesis, a formal post-release evaluation of this biological control programme was conducted, specifically to determine the efficacy of H. festerianus as a biological control agent, and to identify factors which may limit or constrain the level of success achieved by the control agent. These data were collected with the intention of improving the control of C. jamacaru in South Africa. A field-based study of C. jamacaru population demographics investigated the efficacy of H. festerianus as a biological control agent of the weed, by integrating weed growth, fecundity and survival metrics with C. jamacaru population dynamics and demographic patterns from 8 sites where H. festerianus was present and 14 sites where the control agent was absent. The findings indicated that H. festerianus significantly reduced weed fecundity, which resulted in fewer seedling recruits, and that levels of plant mortality were greater at sites where H. festerianus was present. The reduction in weed fecundity and survival translated into negative population-level consequences for H. festerianus. Weed-population age frequency distributions in the absence of H. festerianus demonstrated a “reverse J-shaped” distribution, indicative of high recruitment rates and population stability, while C. jamacaru populations infected with H. festerianus were described by bell-shaped distributions, and were typified by limited recruitment, or a complete lack thereof. By constraining recruitment and inhibiting selfregeneration, H. festerianus appears to regulate populations of C. jamacaru. Predation and parasitism of H. festerianus was believed to be a limiting factor for the biological control programme against C. jamacaru in South Africa, although no formal evaluation of this claim had been undertaken. Accordingly, the assemblage of natural enemies acquired by H. festerianus in South Africa was identified by field-collections of infected H. festerianus gall-material. Further, timed point-count surveys of natural enemies associated with H. festerianus were performed and integrated with the data on the impact of H. festerianus on weed population dynamics to assess the impact of two prominent predaceous taxa on H. festerianus efficacy as a biological control agent. Although H. festerianus had acquired a diverse suite of novel natural enemies in South Africa, this has not prevented the biocontrol agent from having an impact on C. jamacaru populations, although other subtler effects cannot be ruled out. This study showed that biological control efforts employing H. festerianus for the management of C. jamacaru have been successful. Furthermore, these data demonstrated the utility of retrospective analyses in developing and improving the science of biological control, specifically how to improve candidate agent prioritisation, determining how many agents are required for successful biological control, and how to evaluate the success of biological control efforts. Improvements in our theoretical understanding of biological control will undoubtedly reduce costs of biological control programmes, improve success rates, and increase the predictability of biological control.
- Full Text:
- Date Issued: 2017
- Authors: Sutton, Guy Frederick
- Date: 2017
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/7982 , vital:21330
- Description: Cereus jamacaru De Candolle (Cactaceae) is an environment-transforming weed of both agricultural and wildlife habitats in South Africa. Weed infestations reduce carrying capacity of the land, and pose a risk to livestock, wildlife and human safety due to the plant’s spiny thorns. The weed is considered to be under complete biological control in South Africa, due to its introduced control agent, Hypogeococcus festerianus Lizer y Trelles (Hemiptera: Pseudococcidae), although observational reports suggest that the level of success achieved is variable. In this thesis, a formal post-release evaluation of this biological control programme was conducted, specifically to determine the efficacy of H. festerianus as a biological control agent, and to identify factors which may limit or constrain the level of success achieved by the control agent. These data were collected with the intention of improving the control of C. jamacaru in South Africa. A field-based study of C. jamacaru population demographics investigated the efficacy of H. festerianus as a biological control agent of the weed, by integrating weed growth, fecundity and survival metrics with C. jamacaru population dynamics and demographic patterns from 8 sites where H. festerianus was present and 14 sites where the control agent was absent. The findings indicated that H. festerianus significantly reduced weed fecundity, which resulted in fewer seedling recruits, and that levels of plant mortality were greater at sites where H. festerianus was present. The reduction in weed fecundity and survival translated into negative population-level consequences for H. festerianus. Weed-population age frequency distributions in the absence of H. festerianus demonstrated a “reverse J-shaped” distribution, indicative of high recruitment rates and population stability, while C. jamacaru populations infected with H. festerianus were described by bell-shaped distributions, and were typified by limited recruitment, or a complete lack thereof. By constraining recruitment and inhibiting selfregeneration, H. festerianus appears to regulate populations of C. jamacaru. Predation and parasitism of H. festerianus was believed to be a limiting factor for the biological control programme against C. jamacaru in South Africa, although no formal evaluation of this claim had been undertaken. Accordingly, the assemblage of natural enemies acquired by H. festerianus in South Africa was identified by field-collections of infected H. festerianus gall-material. Further, timed point-count surveys of natural enemies associated with H. festerianus were performed and integrated with the data on the impact of H. festerianus on weed population dynamics to assess the impact of two prominent predaceous taxa on H. festerianus efficacy as a biological control agent. Although H. festerianus had acquired a diverse suite of novel natural enemies in South Africa, this has not prevented the biocontrol agent from having an impact on C. jamacaru populations, although other subtler effects cannot be ruled out. This study showed that biological control efforts employing H. festerianus for the management of C. jamacaru have been successful. Furthermore, these data demonstrated the utility of retrospective analyses in developing and improving the science of biological control, specifically how to improve candidate agent prioritisation, determining how many agents are required for successful biological control, and how to evaluate the success of biological control efforts. Improvements in our theoretical understanding of biological control will undoubtedly reduce costs of biological control programmes, improve success rates, and increase the predictability of biological control.
- Full Text:
- Date Issued: 2017
Spectroscopic and nonlinear optical characterisation of alpha substituted binuclear phthalocyanines
- Authors: Ngubeni, Grace Nomthandazo
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5038 , vital:20757
- Full Text:
- Date Issued: 2017
- Authors: Ngubeni, Grace Nomthandazo
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5038 , vital:20757
- Full Text:
- Date Issued: 2017
Communication in selected Eastern Cape public healthcare facilities offering termination of pregnancy services: inter/intra-cultural implications
- Authors: Mavuso, Snethemba Fikile
- Date: 2017
- Subjects: Communication in medicine -- South Africa , Medical care -- Communication systems -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7290 , vital:21239
- Description: This study examines pre-termination of pregnancy (PTOP) counselling, focussing on issues of language and access, and sociocultural influences. This research examines linguistic and cultural aspects of communication between healthcare providers and clients in PTOP contexts. The overarching aim of this research was to identify patterns that indicate miscommunication and to propose ways to bridge any linguistic and cultural gaps. This research examine how social norms related to turn taking guide healthcare providers - clients interaction and how the clients respond to advice offered during the counselling sessions. The study provides an indepth understanding of linguistic and cultural barriers in public healthcare, and further emphasizes the need for implementation of support systems for cross-cultural and effective patient-centred communication in healthcare. The findings in this study are thatpresent that miscommunication occurs within intercultural and intra-cultural medical encounters. Excessive use of medical terminology causes communication difficulties. Clients often provide a positive response to indicate that they understand what the healthcare provider is communicating. Clients sometimes respond positively out of politeness. This practice is common in some cultures; it often occurs when the recipient is interacting with a figure of authority or someone of higher positioning. It is found that healthcare provider’s value systems sometimes have an impact on their professional conduct, influencing the type of PTOP counselling provided to clients. Sometimes the language and communication barriers have a negative impact on the quality of care/PTOP counselling. This study argues that healthcare provider’s communication styles and value systems influence PTOP counselling. Healthcare providers have the power to control the medical discourse; their turns at talk influence those of clients. The manner in which the nurses and counsellors address the clients elicits a certain response. This study thus suggests that healthcare providers need to improve their communicative skills, be mindful of their position as power holders and adopt a patient-centred approach, which is crucial for clinical and cultural competence.
- Full Text:
- Date Issued: 2017
- Authors: Mavuso, Snethemba Fikile
- Date: 2017
- Subjects: Communication in medicine -- South Africa , Medical care -- Communication systems -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7290 , vital:21239
- Description: This study examines pre-termination of pregnancy (PTOP) counselling, focussing on issues of language and access, and sociocultural influences. This research examines linguistic and cultural aspects of communication between healthcare providers and clients in PTOP contexts. The overarching aim of this research was to identify patterns that indicate miscommunication and to propose ways to bridge any linguistic and cultural gaps. This research examine how social norms related to turn taking guide healthcare providers - clients interaction and how the clients respond to advice offered during the counselling sessions. The study provides an indepth understanding of linguistic and cultural barriers in public healthcare, and further emphasizes the need for implementation of support systems for cross-cultural and effective patient-centred communication in healthcare. The findings in this study are thatpresent that miscommunication occurs within intercultural and intra-cultural medical encounters. Excessive use of medical terminology causes communication difficulties. Clients often provide a positive response to indicate that they understand what the healthcare provider is communicating. Clients sometimes respond positively out of politeness. This practice is common in some cultures; it often occurs when the recipient is interacting with a figure of authority or someone of higher positioning. It is found that healthcare provider’s value systems sometimes have an impact on their professional conduct, influencing the type of PTOP counselling provided to clients. Sometimes the language and communication barriers have a negative impact on the quality of care/PTOP counselling. This study argues that healthcare provider’s communication styles and value systems influence PTOP counselling. Healthcare providers have the power to control the medical discourse; their turns at talk influence those of clients. The manner in which the nurses and counsellors address the clients elicits a certain response. This study thus suggests that healthcare providers need to improve their communicative skills, be mindful of their position as power holders and adopt a patient-centred approach, which is crucial for clinical and cultural competence.
- Full Text:
- Date Issued: 2017
Development and validation of an In Vitro Release Test (IVRT) to investigate the release of miconazole nitrate from topical cream formulations
- Authors: Purazi, Potiwa
- Date: 2017
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65223 , vital:28711
- Description: Expected release date-May 2019
- Full Text:
- Date Issued: 2017
- Authors: Purazi, Potiwa
- Date: 2017
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65223 , vital:28711
- Description: Expected release date-May 2019
- Full Text:
- Date Issued: 2017
Nonlinear optical responses of phthalocyanines in the presence of nanomaterials or when embedded in polymeric materials
- Authors: Bankole, Owolabi Mutolib
- Date: 2017
- Subjects: Phthalocyanines , Phthalocyanines -- Optical properties , Alkynes , Triazoles , Nonlinear optics , Photochemistry , Complex compounds , Amines , Mercaptopyridine
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/45794 , vital:25548
- Description: This work describes the synthesis, photophysical and nonlinear optical characterizations of alkynyl Pcs (1, 2, 3, 8 and 9), 1,2,3-triazole ZnPc (4), mercaptopyridine Pcs (5, 6 and 7) and amino Pcs (10 and 11). Complexes 1, 2, 4, 7, 8, 9 and 11 were newly synthesized and characterized using techniques including 1H-NMR, MALDI-TOF, UV-visible spectrophotometry, FTIR and elemental analysis. The results of the characterizations were in good agreement with their molecular structures, and confirmed the purity of the new molecules. Complex 10 was covalently linked to pristine graphene (GQDs), nitrogen- doped (NGQDs), and sulfur-nitrogen co-doped (SNGQDs) graphene quantum dots; gold nanoparticles (AuNPs); poly(acrylic acid) (PAA); Fe3O4@Ag core-shell and Fe3O4- Ag hybrid nanoparticles via covalent bonding. Complex 11 was linked to Agx Auy alloy nanoparticles via NH2-Au and/or Au-S bonding, 2 and 3 were linked to gold nanoparticles (AuNPs) via clicked reactions. Evidence of successful conjugation of 2, 3, 10 and 11 to nanomaterials was revealed within the UV-vis, EDS, TEM, XRD and XPS spectra. Optical limiting (OL) responses of the samples were evaluated using open aperture Z-scan technique at 532 nm and 10 ns radiation in solution or when embedded in polymer mixtures. The analyses of the Z-scan data for the studied samples did fit to a two-photon absorption mechanism (2PA), but the Pcs and Pc-nanomaterial or polymer composites also possess the multi-photon absorption mechanisms aided by the triplet-triplet population to have reverse saturable absorption (RSA) occur. Phthalocyanines doped in polymer matrices showed larger nonlinear absorption coefficients (ßeff), third-order susceptibility (Im [x(3)]) and second-order hyperpolarizability (y), with an accompanying low intensity threshold (Ium) than in solution. Aggregation in DMSO negatively affected NLO behaviour of Pcs (8 as a case study) at low laser power, and improved at relatively higher laser power. Heavy atom-substituted Pcs (6) enhanced NLO and OL properties than lighter atoms such as 5 and 7. Direct relationship between enhanced photophysical properties and nonlinear effects favoured by excited triplet absorption of the 2, 3, 10 and 11 in presence of nanomaterials was established. Major factor responsible for the enhanced nonlinearities of 10 in the presence of NGQDs and SNGQDs were fully described and attributed to the surface defects caused by the presence of heteroatoms such as nitrogen and sulfur. The studies showed that phthalocyanines-nanomaterial composites were useful in applications such as optical switching, pulse compressor and laser pulse narrowing.
- Full Text:
- Date Issued: 2017
- Authors: Bankole, Owolabi Mutolib
- Date: 2017
- Subjects: Phthalocyanines , Phthalocyanines -- Optical properties , Alkynes , Triazoles , Nonlinear optics , Photochemistry , Complex compounds , Amines , Mercaptopyridine
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/45794 , vital:25548
- Description: This work describes the synthesis, photophysical and nonlinear optical characterizations of alkynyl Pcs (1, 2, 3, 8 and 9), 1,2,3-triazole ZnPc (4), mercaptopyridine Pcs (5, 6 and 7) and amino Pcs (10 and 11). Complexes 1, 2, 4, 7, 8, 9 and 11 were newly synthesized and characterized using techniques including 1H-NMR, MALDI-TOF, UV-visible spectrophotometry, FTIR and elemental analysis. The results of the characterizations were in good agreement with their molecular structures, and confirmed the purity of the new molecules. Complex 10 was covalently linked to pristine graphene (GQDs), nitrogen- doped (NGQDs), and sulfur-nitrogen co-doped (SNGQDs) graphene quantum dots; gold nanoparticles (AuNPs); poly(acrylic acid) (PAA); Fe3O4@Ag core-shell and Fe3O4- Ag hybrid nanoparticles via covalent bonding. Complex 11 was linked to Agx Auy alloy nanoparticles via NH2-Au and/or Au-S bonding, 2 and 3 were linked to gold nanoparticles (AuNPs) via clicked reactions. Evidence of successful conjugation of 2, 3, 10 and 11 to nanomaterials was revealed within the UV-vis, EDS, TEM, XRD and XPS spectra. Optical limiting (OL) responses of the samples were evaluated using open aperture Z-scan technique at 532 nm and 10 ns radiation in solution or when embedded in polymer mixtures. The analyses of the Z-scan data for the studied samples did fit to a two-photon absorption mechanism (2PA), but the Pcs and Pc-nanomaterial or polymer composites also possess the multi-photon absorption mechanisms aided by the triplet-triplet population to have reverse saturable absorption (RSA) occur. Phthalocyanines doped in polymer matrices showed larger nonlinear absorption coefficients (ßeff), third-order susceptibility (Im [x(3)]) and second-order hyperpolarizability (y), with an accompanying low intensity threshold (Ium) than in solution. Aggregation in DMSO negatively affected NLO behaviour of Pcs (8 as a case study) at low laser power, and improved at relatively higher laser power. Heavy atom-substituted Pcs (6) enhanced NLO and OL properties than lighter atoms such as 5 and 7. Direct relationship between enhanced photophysical properties and nonlinear effects favoured by excited triplet absorption of the 2, 3, 10 and 11 in presence of nanomaterials was established. Major factor responsible for the enhanced nonlinearities of 10 in the presence of NGQDs and SNGQDs were fully described and attributed to the surface defects caused by the presence of heteroatoms such as nitrogen and sulfur. The studies showed that phthalocyanines-nanomaterial composites were useful in applications such as optical switching, pulse compressor and laser pulse narrowing.
- Full Text:
- Date Issued: 2017
A water footprint assessment of dryland pasture based dairy enterprise in the Eastern Cape: a case study
- Authors: Jenje, Paige
- Date: 2017
- Subjects: Water supply, Agricultural -- South Africa , Water supply, Agricultural -- Government policy -- South Africa , Water consumption -- Measurement -- South Africa , Water demand management -- South Africa , Water-supply -- Accounting -- South Africa , Cattle -- Water requirements -- South Africa -- Cast studies
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/5362 , vital:20917
- Description: Water scarcity continues to pose a threat to South Africa, with severe water scarcity predicted within the next fifty years. As a result, national interest has been sparked over the development of market based water resource allocation strategies to alleviate pressures on South Africa's freshwater resources, and ensure compliance with the National Water Act. Agriculture is the largest water user internationally and within South Africa, highlighting the importance of improving the water use efficiency within the industry. This study performed a full water footprint assessment (WFA) of a dryland pasture based dairy enterprise in the Eastern Cape. Following the guidelines of the WFA, this study calculated the blue, green and grey water footprints of dryland pasture based dairy production from crop- to-farm gate by assessing the water footprints of pasture production, bought in feed and concentrates, drinking water and servicing water processes over a period of five years. Following the accounting the of the water footprint, economic and environmental sustainability indicators were used along with the incorporation of the Water Risk Filter tool. This revealed that the case study farm was operating efficiently with the enterprise's highest water related risk being governmental regulation. Water footprint accounting results highlighted that green water was largest contributor to the overall water footprint of over 80%, and grey water contributed the least to the water footprint of dryland pasture based dairy production. Economic productivity results indicated that milk production is highly correlated with annual rainfall due to the breeding strategy undertaken by the farm. Results also indicated little correlation between the monthly water footprint and milk production, with the majority of the enterprise's milk production occurring in the last quarter regardless of the water footprint. The study demonstrated the relationship between the water footprint and economic land and water productivity, along with the value of milk to costs ratio which indicated that approximately R1.00 worth of costs generates between R1.80 and R2.06 value of milk. The sustainability indicators suggested that the farm's management of its effluent dam requires attention to meet the Department of Water and Sanitations effluent waste quality guidelines. The overall analysis of the water footprint suggested that the highest water related risk to dryland dairy production was regulatory risk. This risk suggests that the government cannot be relied upon for the management of freshwater resources within the study area, leaving the onus on the individual dairy farmers. As such, farmers should utilise the water footprint to formulate water stewardship programmes which have the potential to influence the regulation and protection of freshwater resources.
- Full Text:
- Date Issued: 2017
- Authors: Jenje, Paige
- Date: 2017
- Subjects: Water supply, Agricultural -- South Africa , Water supply, Agricultural -- Government policy -- South Africa , Water consumption -- Measurement -- South Africa , Water demand management -- South Africa , Water-supply -- Accounting -- South Africa , Cattle -- Water requirements -- South Africa -- Cast studies
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/5362 , vital:20917
- Description: Water scarcity continues to pose a threat to South Africa, with severe water scarcity predicted within the next fifty years. As a result, national interest has been sparked over the development of market based water resource allocation strategies to alleviate pressures on South Africa's freshwater resources, and ensure compliance with the National Water Act. Agriculture is the largest water user internationally and within South Africa, highlighting the importance of improving the water use efficiency within the industry. This study performed a full water footprint assessment (WFA) of a dryland pasture based dairy enterprise in the Eastern Cape. Following the guidelines of the WFA, this study calculated the blue, green and grey water footprints of dryland pasture based dairy production from crop- to-farm gate by assessing the water footprints of pasture production, bought in feed and concentrates, drinking water and servicing water processes over a period of five years. Following the accounting the of the water footprint, economic and environmental sustainability indicators were used along with the incorporation of the Water Risk Filter tool. This revealed that the case study farm was operating efficiently with the enterprise's highest water related risk being governmental regulation. Water footprint accounting results highlighted that green water was largest contributor to the overall water footprint of over 80%, and grey water contributed the least to the water footprint of dryland pasture based dairy production. Economic productivity results indicated that milk production is highly correlated with annual rainfall due to the breeding strategy undertaken by the farm. Results also indicated little correlation between the monthly water footprint and milk production, with the majority of the enterprise's milk production occurring in the last quarter regardless of the water footprint. The study demonstrated the relationship between the water footprint and economic land and water productivity, along with the value of milk to costs ratio which indicated that approximately R1.00 worth of costs generates between R1.80 and R2.06 value of milk. The sustainability indicators suggested that the farm's management of its effluent dam requires attention to meet the Department of Water and Sanitations effluent waste quality guidelines. The overall analysis of the water footprint suggested that the highest water related risk to dryland dairy production was regulatory risk. This risk suggests that the government cannot be relied upon for the management of freshwater resources within the study area, leaving the onus on the individual dairy farmers. As such, farmers should utilise the water footprint to formulate water stewardship programmes which have the potential to influence the regulation and protection of freshwater resources.
- Full Text:
- Date Issued: 2017
I did not die
- Authors: Mzamo, Tebello
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7246 , vital:21232
- Description: My novella is about a mine worker and his family. Set in both Lesotho and South Africa, it engages the effects of migrant labour on families in post-apartheid South Africa. Told through the eyes of the different family members, the narrative uses shifting points of view and moves fluidly through time to present an intimate but complex view of the lives of ordinary working class people. It incorporates witchcraft and ghosts to reveal the blurred lines between the realms of life and death. This collection is inspired by my own father who is a former mine worker. I am influenced by Joyce Carol Oates and Chibundu Onuzo's darkly realistic style, Veronique Tadjo’s explorations of migration and death, the family chronicles of Chimamanda Ngozi Adichie and Yvonne Adhiambo Owuor. I am also inspired by female fantasy and horror writers such as those collected in Ann and Jeff VanderMeer’s anthology, Sisters of the Revolution: A Feminist Speculative Fiction Anthology.
- Full Text:
- Date Issued: 2017
- Authors: Mzamo, Tebello
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7246 , vital:21232
- Description: My novella is about a mine worker and his family. Set in both Lesotho and South Africa, it engages the effects of migrant labour on families in post-apartheid South Africa. Told through the eyes of the different family members, the narrative uses shifting points of view and moves fluidly through time to present an intimate but complex view of the lives of ordinary working class people. It incorporates witchcraft and ghosts to reveal the blurred lines between the realms of life and death. This collection is inspired by my own father who is a former mine worker. I am influenced by Joyce Carol Oates and Chibundu Onuzo's darkly realistic style, Veronique Tadjo’s explorations of migration and death, the family chronicles of Chimamanda Ngozi Adichie and Yvonne Adhiambo Owuor. I am also inspired by female fantasy and horror writers such as those collected in Ann and Jeff VanderMeer’s anthology, Sisters of the Revolution: A Feminist Speculative Fiction Anthology.
- Full Text:
- Date Issued: 2017
Emathunjini omhlaba kuhlala abantu
- Authors: Moya, Mlandeli Wellington
- Date: 2017
- Subjects: Short stories, Xhosa
- Language: Xhosa , English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7235 , vital:21231
- Description: My short stories are about the circumstances in which black gold miners in Welkom in the 1980s and 1990s found themselves. These mineworkers - I was one of them - made up a large, uneducated segment of personnel because our work required strength and good health only. We came from all over the African continent. The places we had to live in were like jails or military barracks, sometimes with twenty or more of us sharing a single room. Because of these conditions, we shared our pains, and the pains of wives, children and relatives of those who were killed or disabled by their work, the repatriation of those who lost their capacity to continue working because of accidents and work, and work-related illnesses. We did not share the same language, and so we had to learn Fanakalo, the language of South African mine workers. My stories show how pain and happiness rub shoulders with each other in the miners' life, because besides the dangerous work there was also cultural entertainment, religious practices, robbery by tsotsis, and many prostitutes. The book Buzani Kubawo by Witness K. Tamsanqa has been an important influence on my writing. Other influences have been L.L. Sebe's Ucamngco and P.T. Mtuze's Alitshoni Lingaphumi. , La mabali angeemeko zabembi-migodi baseWelkom phaya kwiminyaka ephakathi koo-1980 noo-1990. Aba basebenzi, endandingomnye wabo, babeliqela elivisayo elingafundanga — bezingca ngamandla. Sasiphuma mbombo zonke zeli lase-Afrika. Indawo esasihlala kuyo ibifana nqwa nezisele zentolongo okanye izindlu zasemkhosini. Amashumi amabini amadoda elala ndlwini - nye. Ngenxa yaloo meko sachubelana amabali ngeemeko zobomi bethu, ngabafazi nabantwana, nezizalwane, nangeengozi esasingena kuzo nokugoduswa kwabo bagulayo. Kwathi kuba sasithetha iilwimi ngeelwimi safundiswa isiFanakalo. Amabali am abonisa iintlungu ezayame kulonwabo kuloo meko yasemigodini kuba yayikho nemidlalo nemigcobo ezonwabisayo ngokweentlanga ngeentlanga. Sasikwajongene nootsotsi kunye neentwazana ezithengisa ngemizimba. Ababhali abathe banefuthe ekubhaleni kwam baquka aba: uW.K. Thamsanqa ngencwadi yakhe ethi "Buzani kubawo," uP.T. Mtuze ngeyakhe ethi "Alitshoni Lingaphumi," kunye no L.L. Sebe ngencwadi yakhe ethi "Ucamngco."
- Full Text:
- Date Issued: 2017
- Authors: Moya, Mlandeli Wellington
- Date: 2017
- Subjects: Short stories, Xhosa
- Language: Xhosa , English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7235 , vital:21231
- Description: My short stories are about the circumstances in which black gold miners in Welkom in the 1980s and 1990s found themselves. These mineworkers - I was one of them - made up a large, uneducated segment of personnel because our work required strength and good health only. We came from all over the African continent. The places we had to live in were like jails or military barracks, sometimes with twenty or more of us sharing a single room. Because of these conditions, we shared our pains, and the pains of wives, children and relatives of those who were killed or disabled by their work, the repatriation of those who lost their capacity to continue working because of accidents and work, and work-related illnesses. We did not share the same language, and so we had to learn Fanakalo, the language of South African mine workers. My stories show how pain and happiness rub shoulders with each other in the miners' life, because besides the dangerous work there was also cultural entertainment, religious practices, robbery by tsotsis, and many prostitutes. The book Buzani Kubawo by Witness K. Tamsanqa has been an important influence on my writing. Other influences have been L.L. Sebe's Ucamngco and P.T. Mtuze's Alitshoni Lingaphumi. , La mabali angeemeko zabembi-migodi baseWelkom phaya kwiminyaka ephakathi koo-1980 noo-1990. Aba basebenzi, endandingomnye wabo, babeliqela elivisayo elingafundanga — bezingca ngamandla. Sasiphuma mbombo zonke zeli lase-Afrika. Indawo esasihlala kuyo ibifana nqwa nezisele zentolongo okanye izindlu zasemkhosini. Amashumi amabini amadoda elala ndlwini - nye. Ngenxa yaloo meko sachubelana amabali ngeemeko zobomi bethu, ngabafazi nabantwana, nezizalwane, nangeengozi esasingena kuzo nokugoduswa kwabo bagulayo. Kwathi kuba sasithetha iilwimi ngeelwimi safundiswa isiFanakalo. Amabali am abonisa iintlungu ezayame kulonwabo kuloo meko yasemigodini kuba yayikho nemidlalo nemigcobo ezonwabisayo ngokweentlanga ngeentlanga. Sasikwajongene nootsotsi kunye neentwazana ezithengisa ngemizimba. Ababhali abathe banefuthe ekubhaleni kwam baquka aba: uW.K. Thamsanqa ngencwadi yakhe ethi "Buzani kubawo," uP.T. Mtuze ngeyakhe ethi "Alitshoni Lingaphumi," kunye no L.L. Sebe ngencwadi yakhe ethi "Ucamngco."
- Full Text:
- Date Issued: 2017
Exploring a genre-based pedagogy in the teaching of writing explanation texts in a Grade 11 ESL classroom: an action research case study
- Authors: Nekondo, Linus Vaakohambo
- Date: 2017
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/41603 , vital:25107
- Description: This thesis reports on an action research case study into the use of a genre-based approach (GBA) in teaching the writing of explanation texts to Grade 11 learners in Ohangwena Region, Namibia. Knowledge of how to write different genres is a requirement of the Namibian curriculum, and in particular the Grade 11-12 English Second Language [ESL] syllabus. The study aimed to improve my pedagogic practice in the teaching of genre as an English Second Language [ESL] teacher. It also aimed to further develop my Grade 11 learners’ academic language proficiency in genre writing. I employed two action research [AR] cycles. The first cycle was aimed at establishing learners’ baseline proficiencies with regards to writing explanation texts. The second was then aimed at strengthening the weaknesses I identified in my first cycle. Theoretically informed by the genre and socio-constructivism theories, and following the recommended stages of the genre pedagogy cycle, I designed a GBA lesson unit comprising seven lessons. The lessons spanned a two week period. I used formative assessment to assess my learners’ activities during each lesson using marking rubrics designed in line with the structural and linguistic conventions of explanation texts. Data sources include document evidence from my learners’ pre- and post- instruction written works, my written reflections on the teaching/learning process from my research journal, my learners’ written reflections on each lesson, and the whole class closing discussion. The data revealed that, prior to the GBA intervention, while my Grade 11 learners possessed some skill in writing shorter explanations for content subjects; they lacked deep knowledge for so doing in ESL. The post GBA intervention data revealed that, by interacting with texts and working collaboratively in unpacking the features of the genre, learners were able to develop a more critical awareness of the generic and linguistic features of written explanation texts. The study concludes that learners’ genre writing skills can be strengthened through using a GBA approach in which they are immersed in the relevant text features and provided with appropriate assistance and feedback.
- Full Text:
- Date Issued: 2017
- Authors: Nekondo, Linus Vaakohambo
- Date: 2017
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/41603 , vital:25107
- Description: This thesis reports on an action research case study into the use of a genre-based approach (GBA) in teaching the writing of explanation texts to Grade 11 learners in Ohangwena Region, Namibia. Knowledge of how to write different genres is a requirement of the Namibian curriculum, and in particular the Grade 11-12 English Second Language [ESL] syllabus. The study aimed to improve my pedagogic practice in the teaching of genre as an English Second Language [ESL] teacher. It also aimed to further develop my Grade 11 learners’ academic language proficiency in genre writing. I employed two action research [AR] cycles. The first cycle was aimed at establishing learners’ baseline proficiencies with regards to writing explanation texts. The second was then aimed at strengthening the weaknesses I identified in my first cycle. Theoretically informed by the genre and socio-constructivism theories, and following the recommended stages of the genre pedagogy cycle, I designed a GBA lesson unit comprising seven lessons. The lessons spanned a two week period. I used formative assessment to assess my learners’ activities during each lesson using marking rubrics designed in line with the structural and linguistic conventions of explanation texts. Data sources include document evidence from my learners’ pre- and post- instruction written works, my written reflections on the teaching/learning process from my research journal, my learners’ written reflections on each lesson, and the whole class closing discussion. The data revealed that, prior to the GBA intervention, while my Grade 11 learners possessed some skill in writing shorter explanations for content subjects; they lacked deep knowledge for so doing in ESL. The post GBA intervention data revealed that, by interacting with texts and working collaboratively in unpacking the features of the genre, learners were able to develop a more critical awareness of the generic and linguistic features of written explanation texts. The study concludes that learners’ genre writing skills can be strengthened through using a GBA approach in which they are immersed in the relevant text features and provided with appropriate assistance and feedback.
- Full Text:
- Date Issued: 2017
Progress in implementing the ecosystem approach to fisheries in South Africa in principle and in practice
- Duna, Elethu Zamandlane Lona
- Authors: Duna, Elethu Zamandlane Lona
- Date: 2017
- Subjects: Fisheries -- Environmental aspects -- South Africa , Sustainable fisheries -- South Africa , Fishery management -- South Africa , South African Sustainable Seafood Initiative
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/44879 , vital:25449
- Description: Over the last century, the population of the world has more than doubled, resulting in an increase in seafood consumption (FAO 2010), and placing strain on fisheries wild stocks, their habitats, and the coastal communities that rely on them for food and survival. The ecosystem approach to fisheries (EAF) differs from other management approaches by combining all aspects of ecosystem management, and strives to conserve ecosystem structure, maintain diversity, productivity, and integrity, and to meet human food and economic needs. This study aims to assess how South Africa is progressing in implementing EAF in principle and in practice, to identify challenges, and suggest solutions, where appropriate. The law sets precedence on governance. An assessment of the Marine Living Resources Act, (MLRA) and the South African Policy for Small-scale Fisheries (SSFP) revealed that, although these instruments recognise and contain elements of EAF, this management approach has not been adequately implemented. In practice, the status of implementation of EAF was assessed through the Southern African Sustainable Seafood Initiative (SASSI) and the Ecological Risk Assessments (ERA). The scores of 65 assessments, conducted in 2013 and 2014, were obtained from SASSI. Of the 65 species assessed; 18.4% were listed as Green, 50.8% were listed as Orange and 30.8% were listed as Red. Two methods were used to analyse the data; non-metric multidimensional scaling (NMDS), and cluster analysis in the statistical program R. Analysis of the SASSI assessments indicates that there has been progress in implementing EAF since the World Summit on Sustainable Development in 2002. The high number of Orange and Red listed species however, indicate that major sustainability issues still exist. Species in commercially important fisheries enjoy the bulk of research and management attention compared to other species, including bycatch species, as reflected by a high proportion of Green-rated commercially important species. Based on these results, four fisheries were chosen for further indepth analysis using additional information found in ecological risk assessments: offshore demersal trawl, inshore demersal trawl, West Coast rock lobster fishery and the line fishery. The documents and published literature of the Department of Agriculture, Forestry and Fisheries Internal Scientific Working Groups provided further information. A Wilcoxon signed rank test conducted in the programme R on the results of the ERAs showed that there was a decline in implementation of EAF and reinforced the earlier conclusion that large commercial fisheries, offshore and inshore demersal trawl, were progressing in implementing EAF faster than West Coast rock lobster and line fisheries, which are examples of smaller-scale fisheries that are more accessible to many resource users. Both progress and challenges appeared to be largely influenced by several common factors, which include the presence or absence of positive incentives, co-management, management plans, access, compliance, economic importance, capacity, and the interests of rights holders and other stakeholders.
- Full Text:
- Date Issued: 2017
- Authors: Duna, Elethu Zamandlane Lona
- Date: 2017
- Subjects: Fisheries -- Environmental aspects -- South Africa , Sustainable fisheries -- South Africa , Fishery management -- South Africa , South African Sustainable Seafood Initiative
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/44879 , vital:25449
- Description: Over the last century, the population of the world has more than doubled, resulting in an increase in seafood consumption (FAO 2010), and placing strain on fisheries wild stocks, their habitats, and the coastal communities that rely on them for food and survival. The ecosystem approach to fisheries (EAF) differs from other management approaches by combining all aspects of ecosystem management, and strives to conserve ecosystem structure, maintain diversity, productivity, and integrity, and to meet human food and economic needs. This study aims to assess how South Africa is progressing in implementing EAF in principle and in practice, to identify challenges, and suggest solutions, where appropriate. The law sets precedence on governance. An assessment of the Marine Living Resources Act, (MLRA) and the South African Policy for Small-scale Fisheries (SSFP) revealed that, although these instruments recognise and contain elements of EAF, this management approach has not been adequately implemented. In practice, the status of implementation of EAF was assessed through the Southern African Sustainable Seafood Initiative (SASSI) and the Ecological Risk Assessments (ERA). The scores of 65 assessments, conducted in 2013 and 2014, were obtained from SASSI. Of the 65 species assessed; 18.4% were listed as Green, 50.8% were listed as Orange and 30.8% were listed as Red. Two methods were used to analyse the data; non-metric multidimensional scaling (NMDS), and cluster analysis in the statistical program R. Analysis of the SASSI assessments indicates that there has been progress in implementing EAF since the World Summit on Sustainable Development in 2002. The high number of Orange and Red listed species however, indicate that major sustainability issues still exist. Species in commercially important fisheries enjoy the bulk of research and management attention compared to other species, including bycatch species, as reflected by a high proportion of Green-rated commercially important species. Based on these results, four fisheries were chosen for further indepth analysis using additional information found in ecological risk assessments: offshore demersal trawl, inshore demersal trawl, West Coast rock lobster fishery and the line fishery. The documents and published literature of the Department of Agriculture, Forestry and Fisheries Internal Scientific Working Groups provided further information. A Wilcoxon signed rank test conducted in the programme R on the results of the ERAs showed that there was a decline in implementation of EAF and reinforced the earlier conclusion that large commercial fisheries, offshore and inshore demersal trawl, were progressing in implementing EAF faster than West Coast rock lobster and line fisheries, which are examples of smaller-scale fisheries that are more accessible to many resource users. Both progress and challenges appeared to be largely influenced by several common factors, which include the presence or absence of positive incentives, co-management, management plans, access, compliance, economic importance, capacity, and the interests of rights holders and other stakeholders.
- Full Text:
- Date Issued: 2017
New spaces and old stories: the Luminance woman, black womanhood and the illusion of the “new” South Africa
- Alweendo, Ndapwa Magano Nelao
- Authors: Alweendo, Ndapwa Magano Nelao
- Date: 2017
- Subjects: Luminance stores (South Africa) , Dhlomo, Khanyi , Dlamini, Judy , Women, Black -- South Africa -- Social life and customes , Women, Black -- South Africa -- Social conditions , Clothing trade -- South Africa , Social classes -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/42619 , vital:25220
- Description: This study examines ideas of black womanhood in post-apartheid South Africa. The opening of the Luminance boutique in 2013, previously owned by South African businesswoman and media mogul Khanyi Dhlomo in Johannesburg’s ultra-exclusive Hyde Park Corner, has been articulated as representing a rupture in the public and private performance of black womanhood. Luminance has positioned itself as a provider of world-class style and beauty and has embraced a narrative of black women’s empowerment in the process. The study is based on narrative semistructured interviews conducted Johannesburg with black women who have shopped at the boutique and women who believe themselves as having a meaningful connection to the store. The literature on black women, both internationally and in South Africa, acknowledges that black women experience multiple and intersecting oppressions of race, class and gender, among others. Located within black feminist theory, the study argues that the Luminance woman does represent some rupture in the historic understanding of black womanhood in South Africa. This woman is an elite player in both the corporate world and the world of luxury consumption, and is certainly entering spaces to which black women have historically been denied access. However, this study argues that there is a danger in reducing this woman to an oversimplified character, allowing responses to her to ignore the complexities of her reality in favour of the simplicity of her story, and ignore the structural socioeconomic challenges that continue to shape the lives of all black women in postapartheid South Africa. In this regard, the Luminance woman, while on the surface appearing to be an empowering new iteration of womanhood that should inspire other black woman, contributes to the erasure of her particular marginal experiences, and the oppression of black women in general. The story of the Luminance women contributes to a narrative of individual hard work and determination that frames her as a respectable example of what the “new” South Africa has delivered for its citizens. This woman is a model example of a South African who has succeeded because she took advantage of the opportunities supposedly afforded to all in the post-1994 era. It is therefore argued that praise of the Luminance woman serves a dual purpose: to reinforce the myth of equal opportunity in South Africa, and to lessen the legitimacy of marginalised groups’ experiences of oppression, especially black women who continue to constitute the poor majority.
- Full Text:
- Date Issued: 2017
- Authors: Alweendo, Ndapwa Magano Nelao
- Date: 2017
- Subjects: Luminance stores (South Africa) , Dhlomo, Khanyi , Dlamini, Judy , Women, Black -- South Africa -- Social life and customes , Women, Black -- South Africa -- Social conditions , Clothing trade -- South Africa , Social classes -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/42619 , vital:25220
- Description: This study examines ideas of black womanhood in post-apartheid South Africa. The opening of the Luminance boutique in 2013, previously owned by South African businesswoman and media mogul Khanyi Dhlomo in Johannesburg’s ultra-exclusive Hyde Park Corner, has been articulated as representing a rupture in the public and private performance of black womanhood. Luminance has positioned itself as a provider of world-class style and beauty and has embraced a narrative of black women’s empowerment in the process. The study is based on narrative semistructured interviews conducted Johannesburg with black women who have shopped at the boutique and women who believe themselves as having a meaningful connection to the store. The literature on black women, both internationally and in South Africa, acknowledges that black women experience multiple and intersecting oppressions of race, class and gender, among others. Located within black feminist theory, the study argues that the Luminance woman does represent some rupture in the historic understanding of black womanhood in South Africa. This woman is an elite player in both the corporate world and the world of luxury consumption, and is certainly entering spaces to which black women have historically been denied access. However, this study argues that there is a danger in reducing this woman to an oversimplified character, allowing responses to her to ignore the complexities of her reality in favour of the simplicity of her story, and ignore the structural socioeconomic challenges that continue to shape the lives of all black women in postapartheid South Africa. In this regard, the Luminance woman, while on the surface appearing to be an empowering new iteration of womanhood that should inspire other black woman, contributes to the erasure of her particular marginal experiences, and the oppression of black women in general. The story of the Luminance women contributes to a narrative of individual hard work and determination that frames her as a respectable example of what the “new” South Africa has delivered for its citizens. This woman is a model example of a South African who has succeeded because she took advantage of the opportunities supposedly afforded to all in the post-1994 era. It is therefore argued that praise of the Luminance woman serves a dual purpose: to reinforce the myth of equal opportunity in South Africa, and to lessen the legitimacy of marginalised groups’ experiences of oppression, especially black women who continue to constitute the poor majority.
- Full Text:
- Date Issued: 2017
Understanding as an epistemic virtue : a value-driven non-factive account
- Authors: Rybko, Caitlin
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:21195 , http://hdl.handle.net/10962/6874
- Description: Understanding has been somewhat undervalued and underexplored in the current literature and often its value is tied into that of either truth or knowledge. This thesis aims to provide an account of understanding that defends its value as an epistemic good that is not contingent on either knowledge or truth. I will aim to construct an account that is value driven rather than nature driven as it seems that this is where the problem lies. In order to do this I will assess two current accounts of understanding and show that they cannot adequately explain the value that we give to understanding, nor do they explain how we understand.
- Full Text:
- Date Issued: 2017
- Authors: Rybko, Caitlin
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:21195 , http://hdl.handle.net/10962/6874
- Description: Understanding has been somewhat undervalued and underexplored in the current literature and often its value is tied into that of either truth or knowledge. This thesis aims to provide an account of understanding that defends its value as an epistemic good that is not contingent on either knowledge or truth. I will aim to construct an account that is value driven rather than nature driven as it seems that this is where the problem lies. In order to do this I will assess two current accounts of understanding and show that they cannot adequately explain the value that we give to understanding, nor do they explain how we understand.
- Full Text:
- Date Issued: 2017
A sustainability assessment of the Inxuba Yethemba local municipality
- Authors: Van Lingen, Matthew
- Date: 2017
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/7056 , vital:21213
- Description: The aim of this research was to assess the sustainability of the Inxuba Yethemba local municipality with the goal that policy-makers would use the assessment recommendations to improve their decision-making. The United Nations Indicators for Sustainable Development framework (3rd Edition) was chosen to carry out the assessment because of its indicator selection and methodology for distinguishing which indicators were relevant or irrelevant for the assessment (United Nations, 2007). If an indicator showed that the situation was improving, it was assumed to help with the overall sustainability of the area (Hedayati-Moghadam, Eskandar Seidayi and Nouri, 2014; and United Nations, 2007). The indicators for environmental sustainability showed that the area is on an environmentally sustainable path (Du Toit, 2017; United Nations, 2007). While the indicators for social sustainability showed that the living standards of the population (measured by poverty, housing, and access to electricity amongst others) had increased which is a good indication for social sustainability. The indicators for education and labour productivity showed the opposite (CHDM a, 2012; CHDM a, 2014; United Nations, 2007). The indicators for the economy showed that the economy was not growing which is not a good indication for economic sustainability (CHDM a, 2012; CHDM a, 2014; United Nations, 2007). The recommendation to policy-makers is that developing labour productivity through education and skills training is the most important area to improve, and compiling regular sustainability assessments will improve their decision making. Another recommendation is that, because 65% of the households rely on the social grant (CHDM b, 2014) this cannot be withdrawn in the short term. Furthermore, if inflation were to develop into hyperinflation, the value of the social grants would deteriorate (Market Insight South Africa, 2016). A recommendation to policy makers is that more data collection is needed in order to do proper sustainability assessments. Overall, the municipality cannot be classified as sustainable mainly on account of the poor education system, high levels of unemployed and unskilled labour, and the social, and economic dependence that the municipality has on government spending.
- Full Text:
- Date Issued: 2017
- Authors: Van Lingen, Matthew
- Date: 2017
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/7056 , vital:21213
- Description: The aim of this research was to assess the sustainability of the Inxuba Yethemba local municipality with the goal that policy-makers would use the assessment recommendations to improve their decision-making. The United Nations Indicators for Sustainable Development framework (3rd Edition) was chosen to carry out the assessment because of its indicator selection and methodology for distinguishing which indicators were relevant or irrelevant for the assessment (United Nations, 2007). If an indicator showed that the situation was improving, it was assumed to help with the overall sustainability of the area (Hedayati-Moghadam, Eskandar Seidayi and Nouri, 2014; and United Nations, 2007). The indicators for environmental sustainability showed that the area is on an environmentally sustainable path (Du Toit, 2017; United Nations, 2007). While the indicators for social sustainability showed that the living standards of the population (measured by poverty, housing, and access to electricity amongst others) had increased which is a good indication for social sustainability. The indicators for education and labour productivity showed the opposite (CHDM a, 2012; CHDM a, 2014; United Nations, 2007). The indicators for the economy showed that the economy was not growing which is not a good indication for economic sustainability (CHDM a, 2012; CHDM a, 2014; United Nations, 2007). The recommendation to policy-makers is that developing labour productivity through education and skills training is the most important area to improve, and compiling regular sustainability assessments will improve their decision making. Another recommendation is that, because 65% of the households rely on the social grant (CHDM b, 2014) this cannot be withdrawn in the short term. Furthermore, if inflation were to develop into hyperinflation, the value of the social grants would deteriorate (Market Insight South Africa, 2016). A recommendation to policy makers is that more data collection is needed in order to do proper sustainability assessments. Overall, the municipality cannot be classified as sustainable mainly on account of the poor education system, high levels of unemployed and unskilled labour, and the social, and economic dependence that the municipality has on government spending.
- Full Text:
- Date Issued: 2017
Evaluating the potential of monometallic and bimetallic nanomaterials as horseradish peroxidase mimetics
- Authors: Mvango, Sindisiwe
- Date: 2017
- Subjects: Uncatalogued
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/65134 , vital:28694
- Description: This study presents the synthesis of citrate-capped gold nanoparticles (cit-AuNPs), copper oxide nanoparticles (CuONPs), glutathione-capped gold nanoparticles (GSH-AuNPs), 4- aminothiophenol-capped gold nanoparticles (4-ATP-AuNPs), 4-mercapto benzoic acid- capped gold nanoparticles (4-MBA-AuNPs) and copper oxide gold nanoalloys (CuO-Au nanoalloys). Microscopy and spectroscopy techniques were used to confirm the successful synthesis of these nanoparticles. The synthesized nanoparticles were studied their potential applications as horseradish peroxidase (HPR) enzyme mimetics and for the detection of glucose. The cit-AuNPs and GSH-AuNPs exhibited peroxidase-like activity towards hydrogen peroxide (H2O2) with high Michaelis-Menten (Km) values of 61.5 mM and 30.8 mM, respectively. The other nanoparticles, that is, 4-ATP-AuNPs, CuONPs and CuO-Au nanoalloys gave lower Km values of 4.74 mM, 1.92 mM and 4.05 mM, respectively. The obtained Km values were comparable to those of HRP enzymes which ranged from 0.214 - 3.70 mM with 4-ATP-AuNPs and CuO-Au nanoalloys slightly higher. These values were within the reasonable experimental values of the HRP enzyme. The studies showed that the gold nanoparticles had low adsorptive efficiency towards H2O2 compared to the copper-based nanoparticles (CuONPs and CuO-Au nanoalloys). The CuO-Au nanoalloys also showed the synergistic effect between the gold and copper nanoparticles with extended linear concentration range for the quantification of H2O2. The mechanism of catalysis was confirmed using UV-vis spectroscopy and electron paramagnetic resonance (EPR) in that the generation of reactive oxygen species was observed. The use of 1,3-diphenylisobenzofuran (DPBF) as radical quencher and 5,5- dimethyl-1-pyrroline N-oxide (DMPO) as a radical scavenger confirmed the production of reductive reactive oxygen species using UV-vis and EPR studies. The rate of production of reactive oxygen species in the gold-based nanoparticles was small compared to the copper-based nanoparticles, that is CuONPs and CuO-Au (bimetallic) nanoalloys. The synthesized nanoparticles were further studied their potential use in the colorimetric detection of glucose. The copper-based nanomaterials, CuONPs and CuO-Au nanoalloys, were excellent towards detection of glucose, with a limit of detection (LoD) of 9.34 pM for CuONPs and 6.75 pM for CuO-Au nanoalloys. The linear concentration (LCR) range of CuONPs was 0 to 70 pM and for CuO-Au nanoalloys the LCR was 0.0 - 30 pM. , Thesis (MSc) -- Faculty of Science, Chemistry, 2017
- Full Text:
- Date Issued: 2017
- Authors: Mvango, Sindisiwe
- Date: 2017
- Subjects: Uncatalogued
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/65134 , vital:28694
- Description: This study presents the synthesis of citrate-capped gold nanoparticles (cit-AuNPs), copper oxide nanoparticles (CuONPs), glutathione-capped gold nanoparticles (GSH-AuNPs), 4- aminothiophenol-capped gold nanoparticles (4-ATP-AuNPs), 4-mercapto benzoic acid- capped gold nanoparticles (4-MBA-AuNPs) and copper oxide gold nanoalloys (CuO-Au nanoalloys). Microscopy and spectroscopy techniques were used to confirm the successful synthesis of these nanoparticles. The synthesized nanoparticles were studied their potential applications as horseradish peroxidase (HPR) enzyme mimetics and for the detection of glucose. The cit-AuNPs and GSH-AuNPs exhibited peroxidase-like activity towards hydrogen peroxide (H2O2) with high Michaelis-Menten (Km) values of 61.5 mM and 30.8 mM, respectively. The other nanoparticles, that is, 4-ATP-AuNPs, CuONPs and CuO-Au nanoalloys gave lower Km values of 4.74 mM, 1.92 mM and 4.05 mM, respectively. The obtained Km values were comparable to those of HRP enzymes which ranged from 0.214 - 3.70 mM with 4-ATP-AuNPs and CuO-Au nanoalloys slightly higher. These values were within the reasonable experimental values of the HRP enzyme. The studies showed that the gold nanoparticles had low adsorptive efficiency towards H2O2 compared to the copper-based nanoparticles (CuONPs and CuO-Au nanoalloys). The CuO-Au nanoalloys also showed the synergistic effect between the gold and copper nanoparticles with extended linear concentration range for the quantification of H2O2. The mechanism of catalysis was confirmed using UV-vis spectroscopy and electron paramagnetic resonance (EPR) in that the generation of reactive oxygen species was observed. The use of 1,3-diphenylisobenzofuran (DPBF) as radical quencher and 5,5- dimethyl-1-pyrroline N-oxide (DMPO) as a radical scavenger confirmed the production of reductive reactive oxygen species using UV-vis and EPR studies. The rate of production of reactive oxygen species in the gold-based nanoparticles was small compared to the copper-based nanoparticles, that is CuONPs and CuO-Au (bimetallic) nanoalloys. The synthesized nanoparticles were further studied their potential use in the colorimetric detection of glucose. The copper-based nanomaterials, CuONPs and CuO-Au nanoalloys, were excellent towards detection of glucose, with a limit of detection (LoD) of 9.34 pM for CuONPs and 6.75 pM for CuO-Au nanoalloys. The linear concentration (LCR) range of CuONPs was 0 to 70 pM and for CuO-Au nanoalloys the LCR was 0.0 - 30 pM. , Thesis (MSc) -- Faculty of Science, Chemistry, 2017
- Full Text:
- Date Issued: 2017
Talent management: a case study of Namibia’s Directorate of Civil Aviation (DCA) in securing talent for aviation safety, 2008 to 2014
- Authors: Simataa, George
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7131 , vital:21220
- Description: This study is about talent management, focusing on a case study of the initiatives undertaken by the Directorate of Civil Aviation (DCA) of Namibia over the period 2008 to 2014 in securing talent for aviation safety. The International Civil Aviation Organisation (ICAO) regularly assesses the extent to which member states comply with their safety oversight responsibilities. According to a 1996 report by the ICAO, under the auspices of its Universal Safety Oversight and Security Audit Programme (USOSAP), Namibia’s safety oversight was found to be weak, as indicative of the State’s inability to guarantee the safety of aircraft operations within the national airspace (ICAO, 1996). One of the significant audit findings was the critical shortage of qualified professionals at the Directorate Civil Aviation (DCA) to effectively perform the State’s regulatory and oversight function as contained in the Chicago Convention of 1944. The shortage of qualified professionals resulted in Namibia being unable to respond to its obligations and responsibilities under the Chicago Convention and Namibia’s subsequent blacklisting by the ICAO Audit Result Review Board (ARRB). Consequently, a corrective action plan was undertaken. This study examines one aspect of this plan, namely the initiatives that were undertaken to secure the talent required for aviation safety posts. The aim of the research is, from the perspective of talent management, to analyse the corrective action plan of the Directorate of Civil Aviation (DCA), as a process of securing talent for strategic positions in aviation safety in Namibia. This initiative was analysed from the perspective of the fourth stream of talent management, which emphasises securing talent for strategic positions (Collings and Mellahi, 2009; Huselid & Becker, 2011). Taking into account the fact that Namibia was a racially and culturally divided society until about 25 years ago, the study also deals with issues of diversity management as they impacted upon the talent management of the civil aviation industry nationally. Furthermore, the study is located against the background of the Bantu Education System that was provided by the apartheid South African government to Namibians before independence in 1990. The research design of this study involved conducting a case study that followed a deductive approach. Data were collected using multiple methods and sources such as documentation, interviews and archival records. Content analysis was used in the analysis of collected data. The findings of the study showed the talent management strategies that were adopted in managing strategic positions, the challenges encountered and the impact of the programme. The findings were initially discussed from the perspective of stream four of talent management, with its focus on strategic positions in organisations. Some of the findings of the study were in line with this approach to talent management, but certain challenges that were encountered in carrying out the talent management programme could not be addressed from this perspective, thereby exposing the limits of this approach to talent management in an emerging economy like Namibia. Consequently, a proposed model of sustainable talent management for the DCA was developed. From the perspective of this model of sustainable talent management, recommendations were made for practice and further research.
- Full Text:
- Date Issued: 2017
- Authors: Simataa, George
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7131 , vital:21220
- Description: This study is about talent management, focusing on a case study of the initiatives undertaken by the Directorate of Civil Aviation (DCA) of Namibia over the period 2008 to 2014 in securing talent for aviation safety. The International Civil Aviation Organisation (ICAO) regularly assesses the extent to which member states comply with their safety oversight responsibilities. According to a 1996 report by the ICAO, under the auspices of its Universal Safety Oversight and Security Audit Programme (USOSAP), Namibia’s safety oversight was found to be weak, as indicative of the State’s inability to guarantee the safety of aircraft operations within the national airspace (ICAO, 1996). One of the significant audit findings was the critical shortage of qualified professionals at the Directorate Civil Aviation (DCA) to effectively perform the State’s regulatory and oversight function as contained in the Chicago Convention of 1944. The shortage of qualified professionals resulted in Namibia being unable to respond to its obligations and responsibilities under the Chicago Convention and Namibia’s subsequent blacklisting by the ICAO Audit Result Review Board (ARRB). Consequently, a corrective action plan was undertaken. This study examines one aspect of this plan, namely the initiatives that were undertaken to secure the talent required for aviation safety posts. The aim of the research is, from the perspective of talent management, to analyse the corrective action plan of the Directorate of Civil Aviation (DCA), as a process of securing talent for strategic positions in aviation safety in Namibia. This initiative was analysed from the perspective of the fourth stream of talent management, which emphasises securing talent for strategic positions (Collings and Mellahi, 2009; Huselid & Becker, 2011). Taking into account the fact that Namibia was a racially and culturally divided society until about 25 years ago, the study also deals with issues of diversity management as they impacted upon the talent management of the civil aviation industry nationally. Furthermore, the study is located against the background of the Bantu Education System that was provided by the apartheid South African government to Namibians before independence in 1990. The research design of this study involved conducting a case study that followed a deductive approach. Data were collected using multiple methods and sources such as documentation, interviews and archival records. Content analysis was used in the analysis of collected data. The findings of the study showed the talent management strategies that were adopted in managing strategic positions, the challenges encountered and the impact of the programme. The findings were initially discussed from the perspective of stream four of talent management, with its focus on strategic positions in organisations. Some of the findings of the study were in line with this approach to talent management, but certain challenges that were encountered in carrying out the talent management programme could not be addressed from this perspective, thereby exposing the limits of this approach to talent management in an emerging economy like Namibia. Consequently, a proposed model of sustainable talent management for the DCA was developed. From the perspective of this model of sustainable talent management, recommendations were made for practice and further research.
- Full Text:
- Date Issued: 2017
A critical analysis of the role of the Movement for Democratic Change (MDC) in the democratisation process in Zimbabwe from 2000 to 2016
- Authors: Mwonzora, Gift
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/8093 , vital:21353
- Description: The thesis provides a critical analysis of the role of the Movement for Democratic Change (MDC) in contributing to processes of democratisation in Zimbabwe from 2000 to 2016. The MDC was formed in 1999 and it became the most important opposition party to the ruling Zimbabwe African National Union-Patriotic Front (ZANU-PF) party in Zimbabwe since independence in 1980. During this period, though, the MDC also entered into a coalition government with ZANU-PF under the Government of National Unity (GNU) from 2009 to 2013. In characterising the Zimbabwean state as a semi-authoritarian regime with a defiant ruling party, the thesis identifies and examines the significant challenges faced by the MDC in seeking democratisation, including within the realms of electoral, constitutional and legislative change. At the same time, the MDC suffered from significant internal problems including major splits, with the original MDC becoming MDC-Tsvangirai (MDC-T) in 2005. In focusing on the MDC and democratisation over the entire course of the party’s existence, the thesis is able to identify any important differences between the pre-GNU period, the GNU period and the post-GNU period. As well, it is able to consider the changing relationships between the MDC and the pro-democracy forces from which it first emerged, namely urban civil society and trade unions. The thesis concludes that the effectiveness of the MDC in bringing about democratisation has been highly uneven across the realms of electoral, constitutional and legislative change, and that any changes are necessarily tentative and subject to reversals given the ongoing semi-authoritarian regime in which the ruling ZANU-PF party has in effect fused with the state. Though there has been some evidence of democratic transition in Zimbabwe under the influence of the MDC (and MDC-T), more far-reaching democratic consolidation remains elusive. The fieldwork for the thesis is in large part based on a qualitative research methodology, involving key informant interviews, observations, primary documentation, and participation in political rallies and public lectures.
- Full Text:
- Date Issued: 2017
- Authors: Mwonzora, Gift
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/8093 , vital:21353
- Description: The thesis provides a critical analysis of the role of the Movement for Democratic Change (MDC) in contributing to processes of democratisation in Zimbabwe from 2000 to 2016. The MDC was formed in 1999 and it became the most important opposition party to the ruling Zimbabwe African National Union-Patriotic Front (ZANU-PF) party in Zimbabwe since independence in 1980. During this period, though, the MDC also entered into a coalition government with ZANU-PF under the Government of National Unity (GNU) from 2009 to 2013. In characterising the Zimbabwean state as a semi-authoritarian regime with a defiant ruling party, the thesis identifies and examines the significant challenges faced by the MDC in seeking democratisation, including within the realms of electoral, constitutional and legislative change. At the same time, the MDC suffered from significant internal problems including major splits, with the original MDC becoming MDC-Tsvangirai (MDC-T) in 2005. In focusing on the MDC and democratisation over the entire course of the party’s existence, the thesis is able to identify any important differences between the pre-GNU period, the GNU period and the post-GNU period. As well, it is able to consider the changing relationships between the MDC and the pro-democracy forces from which it first emerged, namely urban civil society and trade unions. The thesis concludes that the effectiveness of the MDC in bringing about democratisation has been highly uneven across the realms of electoral, constitutional and legislative change, and that any changes are necessarily tentative and subject to reversals given the ongoing semi-authoritarian regime in which the ruling ZANU-PF party has in effect fused with the state. Though there has been some evidence of democratic transition in Zimbabwe under the influence of the MDC (and MDC-T), more far-reaching democratic consolidation remains elusive. The fieldwork for the thesis is in large part based on a qualitative research methodology, involving key informant interviews, observations, primary documentation, and participation in political rallies and public lectures.
- Full Text:
- Date Issued: 2017