Introducing a learning management system in a large first year class: impact on lecturers and students
- Snowball, Jeanette D, Mostert, Markus
- Authors: Snowball, Jeanette D , Mostert, Markus
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68631 , vital:29297 , https://hdl.handle.net/10520/EJC37639
- Description: Publisher version , The challenges of teaching large classes are well documented in the literature on teaching in higher education. Information and communication technologies (ICTs) have the potential to address some of these challenges, but, used inappropriately, technology can perpetuate entrenched practices and simply support performance models of teaching that encourage transmission approaches to learning. This article reports on the impact of implementing a learning management system (LMS) in a first year introductory macroeconomics course with 600 students in a blended learning context. Experiences of the course coordinator, lecturers and an educational technologist are discussed and data was also collected on student perceptions via a course evaluation questionnaire. Results show that the LMS was successful in a number of areas, particularly in improving the lecturers' accessibility to students and in encouraging interaction and participations in online discussion forums.
- Full Text: false
- Date Issued: 2010
- Authors: Snowball, Jeanette D , Mostert, Markus
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68631 , vital:29297 , https://hdl.handle.net/10520/EJC37639
- Description: Publisher version , The challenges of teaching large classes are well documented in the literature on teaching in higher education. Information and communication technologies (ICTs) have the potential to address some of these challenges, but, used inappropriately, technology can perpetuate entrenched practices and simply support performance models of teaching that encourage transmission approaches to learning. This article reports on the impact of implementing a learning management system (LMS) in a first year introductory macroeconomics course with 600 students in a blended learning context. Experiences of the course coordinator, lecturers and an educational technologist are discussed and data was also collected on student perceptions via a course evaluation questionnaire. Results show that the LMS was successful in a number of areas, particularly in improving the lecturers' accessibility to students and in encouraging interaction and participations in online discussion forums.
- Full Text: false
- Date Issued: 2010
Where angels fear to tread: online peer-assessment in a large first-year class
- Mostert, Markus, Snowball, Jeanette D
- Authors: Mostert, Markus , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68845 , vital:29330 , https://doi.org/10.1080/02602938.2012.683770
- Description: Publisher version , In the context of widening participation, large classes and increased diversity, assessment of student learning is becoming increasingly problematic in that providing formative feedback aimed at developing student writing proves to be particularly laborious. Although the potential value of peer assessment has been well documented in the literature, the associated administrative burden, also in relation to managing anonymity and intellectual ownership, makes this option less attractive, particularly in large classes. A potential solution involves the use of information and communication technologies to automate the logistics associated with peer assessment in a time-efficient way. However, uptake of such systems in the higher education community is limited, and research in this area is only beginning. This case study reports on the use of the Moodle Workshop module for formative peer assessment of students’ individual work in a first-year introductory macro-economics class of over 800 students. Data were collected through an end-of-course evaluation survey of students. The study found that using the feature-rich Workshop module not only addressed many of the practical challenges associated with paper-based peer assessments, but also provided a range of additional options for enhancing validity and reliability of peer assessments that would not be possible with paper-based systems.
- Full Text: false
- Date Issued: 2013
- Authors: Mostert, Markus , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68845 , vital:29330 , https://doi.org/10.1080/02602938.2012.683770
- Description: Publisher version , In the context of widening participation, large classes and increased diversity, assessment of student learning is becoming increasingly problematic in that providing formative feedback aimed at developing student writing proves to be particularly laborious. Although the potential value of peer assessment has been well documented in the literature, the associated administrative burden, also in relation to managing anonymity and intellectual ownership, makes this option less attractive, particularly in large classes. A potential solution involves the use of information and communication technologies to automate the logistics associated with peer assessment in a time-efficient way. However, uptake of such systems in the higher education community is limited, and research in this area is only beginning. This case study reports on the use of the Moodle Workshop module for formative peer assessment of students’ individual work in a first-year introductory macro-economics class of over 800 students. Data were collected through an end-of-course evaluation survey of students. The study found that using the feature-rich Workshop module not only addressed many of the practical challenges associated with paper-based peer assessments, but also provided a range of additional options for enhancing validity and reliability of peer assessments that would not be possible with paper-based systems.
- Full Text: false
- Date Issued: 2013
Where angels fear to tread: online peer-assessment in a large first-year class
- Mostert, Markus, Snowball, Jeanette D
- Authors: Mostert, Markus , Snowball, Jeanette D
- Date: 2012
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69289 , vital:29480 , https://doi.org/10.1080/02602938.2012.683770
- Description: In the context of widening participation, large classes and increased diversity, assessment of student learning is becoming increasingly problematic in that providing formative feedback aimed at developing student writing proves to be particularly laborious. Although the potential value of peer assessment has been well documented in the literature, the associated administrative burden, also in relation to managing anonymity and intellectual ownership, makes this option less attractive, particularly in large classes. A potential solution involves the use of information and communication technologies to automate the logistics associated with peer assessment in a time-efficient way. However, uptake of such systems in the higher education community is limited, and research in this area is only beginning. This case study reports on the use of the Moodle Workshop module for formative peer assessment of students’ individual work in a first-year introductory macro-economics class of over 800 students. Data were collected through an end-of-course evaluation survey of students. The study found that using the feature-rich Workshop module not only addressed many of the practical challenges associated with paper-based peer assessments, but also provided a range of additional options for enhancing validity and reliability of peer assessments that would not be possible with paper-based systems.
- Full Text: false
- Date Issued: 2012
- Authors: Mostert, Markus , Snowball, Jeanette D
- Date: 2012
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69289 , vital:29480 , https://doi.org/10.1080/02602938.2012.683770
- Description: In the context of widening participation, large classes and increased diversity, assessment of student learning is becoming increasingly problematic in that providing formative feedback aimed at developing student writing proves to be particularly laborious. Although the potential value of peer assessment has been well documented in the literature, the associated administrative burden, also in relation to managing anonymity and intellectual ownership, makes this option less attractive, particularly in large classes. A potential solution involves the use of information and communication technologies to automate the logistics associated with peer assessment in a time-efficient way. However, uptake of such systems in the higher education community is limited, and research in this area is only beginning. This case study reports on the use of the Moodle Workshop module for formative peer assessment of students’ individual work in a first-year introductory macro-economics class of over 800 students. Data were collected through an end-of-course evaluation survey of students. The study found that using the feature-rich Workshop module not only addressed many of the practical challenges associated with paper-based peer assessments, but also provided a range of additional options for enhancing validity and reliability of peer assessments that would not be possible with paper-based systems.
- Full Text: false
- Date Issued: 2012
Rhodes University Research Report 2012
- Rhodes University, Roberts, Jaine, Connan, Verna, Mantolo, Thumeka, Macgregor, Jill, Jacob, Patricia
- Authors: Rhodes University , Roberts, Jaine , Connan, Verna , Mantolo, Thumeka , Macgregor, Jill , Jacob, Patricia
- Date: 2012
- Language: English
- Type: Text
- Identifier: vital:567 , http://hdl.handle.net/10962/d1011985
- Description: [From Introduction] Rhodes University continued to grow in overall accredited research outputs in 2012, and in other forms of scholarship which enhance the intellectual space of the university. During the graduation ceremonies that followed the 2012 academic year, 2 288 students earned new qualifications. A record 948 students or 41 percent graduated with postgraduate degrees. We also celebrated a new University record of 63 PhD graduates, a wonderful achievement for the smallest university in the country. Our Science Faculty was a particularly noteworthy contributor to the postgraduate numbers, with 35 PhD graduates, 83 Master’s graduates and 132 honours graduates. The University’s Enrolment Plan outlines our intention of becoming a more postgraduate university, and our overall strategy is to enhance our contribution to knowledge production through research and scholarship. Rhodes is well-positioned for such a trajectory, and we look to strengthening our capacity to serve society in this way by striving to provide our academics with effective research support. In the latest Department of Higher Education and Training (DHET) Ministerial Report on National Research Outputs, Rhodes University is listed as having the third most favourable research output rate per capita (the accepted norm for measuring efficiency of investment in the research domain) in the South African university system, and the second highest percentage of academic staff with PhDs (56 percent). Other studies show that Rhodes has the top PhD graduation rate of South African Universities, and very good postgraduate throughput rates overall. We continue to give special attention to identifying potential new postgraduate and research niche areas and programmes, and to developing the appropriate institutional arrangements to effectively support larger numbers of Honours, Masters and Doctoral students, and further enhance their academic and social experiences. The audited result of our DHET submission of accredited research outputs for 2012 has not yet been received at the time of writing, so exact success rates in book and conference submissions are not yet known. These are the smaller components of our overall accredited outputs (in the previous year, books and accredited conference proceedings each contributed 7 percent of our total accredited publishing output, while journals contributed 86 percent). In 2012, Rhodes submitted 46.82 book and book chapter units for consideration (up by 33 percent on the 2011 submission), and 32.04 accredited conference proceeding weighted units (down by 8.6 percent on the 2011 submission, which in turn had been up 46.8 percent on the previous year’s submission).Year-on-year variance on the relatively small submission base in these categories is to be expected. The big component of Rhodes’ publication output, our journal publications, grew by 13.2 percent on the 2011 level to 350.47 units (the previous year has seen a 6 percent increase in this category), maintaining Rhodes’ position amongst the most research productive institutions in the South African Higher Education system. Coupled with Rhodes’ high volume of accredited journal outputs in relation to its size, a very pleasing quality measure is that 90 percent of Journal outputs (the highest proportion in the sector) appear in internationally accredited journal indices. Accredited outputs from thesis-based PhD and Masters graduates rose by 4.9 percent in 2012 to a new high for Rhodes (2011’s figure had grown by 15.4 percent over 2010, which in turn had grown by 35.8 percent over 2009). I add my warm thanks and congratulations to all of our researchers, funders, collaborators and partners who contributed to the excellent accredited research results of 2012, as well as generated the many forms of scholarship that are not counted in the accreditation exercise, but which contribute much to the rich intellectual space that is Rhodes. I also thank all of the administrators who play a crucial role in preparing the university’s meticulous audited submissions.
- Full Text:
- Date Issued: 2012
- Authors: Rhodes University , Roberts, Jaine , Connan, Verna , Mantolo, Thumeka , Macgregor, Jill , Jacob, Patricia
- Date: 2012
- Language: English
- Type: Text
- Identifier: vital:567 , http://hdl.handle.net/10962/d1011985
- Description: [From Introduction] Rhodes University continued to grow in overall accredited research outputs in 2012, and in other forms of scholarship which enhance the intellectual space of the university. During the graduation ceremonies that followed the 2012 academic year, 2 288 students earned new qualifications. A record 948 students or 41 percent graduated with postgraduate degrees. We also celebrated a new University record of 63 PhD graduates, a wonderful achievement for the smallest university in the country. Our Science Faculty was a particularly noteworthy contributor to the postgraduate numbers, with 35 PhD graduates, 83 Master’s graduates and 132 honours graduates. The University’s Enrolment Plan outlines our intention of becoming a more postgraduate university, and our overall strategy is to enhance our contribution to knowledge production through research and scholarship. Rhodes is well-positioned for such a trajectory, and we look to strengthening our capacity to serve society in this way by striving to provide our academics with effective research support. In the latest Department of Higher Education and Training (DHET) Ministerial Report on National Research Outputs, Rhodes University is listed as having the third most favourable research output rate per capita (the accepted norm for measuring efficiency of investment in the research domain) in the South African university system, and the second highest percentage of academic staff with PhDs (56 percent). Other studies show that Rhodes has the top PhD graduation rate of South African Universities, and very good postgraduate throughput rates overall. We continue to give special attention to identifying potential new postgraduate and research niche areas and programmes, and to developing the appropriate institutional arrangements to effectively support larger numbers of Honours, Masters and Doctoral students, and further enhance their academic and social experiences. The audited result of our DHET submission of accredited research outputs for 2012 has not yet been received at the time of writing, so exact success rates in book and conference submissions are not yet known. These are the smaller components of our overall accredited outputs (in the previous year, books and accredited conference proceedings each contributed 7 percent of our total accredited publishing output, while journals contributed 86 percent). In 2012, Rhodes submitted 46.82 book and book chapter units for consideration (up by 33 percent on the 2011 submission), and 32.04 accredited conference proceeding weighted units (down by 8.6 percent on the 2011 submission, which in turn had been up 46.8 percent on the previous year’s submission).Year-on-year variance on the relatively small submission base in these categories is to be expected. The big component of Rhodes’ publication output, our journal publications, grew by 13.2 percent on the 2011 level to 350.47 units (the previous year has seen a 6 percent increase in this category), maintaining Rhodes’ position amongst the most research productive institutions in the South African Higher Education system. Coupled with Rhodes’ high volume of accredited journal outputs in relation to its size, a very pleasing quality measure is that 90 percent of Journal outputs (the highest proportion in the sector) appear in internationally accredited journal indices. Accredited outputs from thesis-based PhD and Masters graduates rose by 4.9 percent in 2012 to a new high for Rhodes (2011’s figure had grown by 15.4 percent over 2010, which in turn had grown by 35.8 percent over 2009). I add my warm thanks and congratulations to all of our researchers, funders, collaborators and partners who contributed to the excellent accredited research results of 2012, as well as generated the many forms of scholarship that are not counted in the accreditation exercise, but which contribute much to the rich intellectual space that is Rhodes. I also thank all of the administrators who play a crucial role in preparing the university’s meticulous audited submissions.
- Full Text:
- Date Issued: 2012
Rhodes University Research Report 2010
- Rhodes University, Roberts, Jaine
- Authors: Rhodes University , Roberts, Jaine
- Date: 2010
- Language: English
- Type: Text
- Identifier: vital:565 , http://hdl.handle.net/10962/d1011968
- Description: From Introduction: In 2010, the total subsidy earning accredited research output count for Rhodes University of 615.3 units represents an increase of 9% on the previous year. By far the major contributor to this growth was the significant increase in both PhD (37.5% up on 2009) and Masters by thesis students (34.5% up on 2009). Rhodes contributed 3.3% of all accredited research output in the public higher education sector in 2010 (0.1% up on 2009). With 1.9% of academic staff in the system, Rhodes retained its place amongst the top three most productive universities as measured by accredited publications per academic. Rhodes exceeds the DHET research output norm for universities by 53%. In 2010, the total accredited publication output count for Rhodes University of 325.33 units represented a decline over 2009 of 7.3 percent. This followed two years of steep growth during which accredited research publication output grew by 28%. Accredited publication output for 2010 consisted mainly of journals at 89.9%, with conference proceedings at 7.2% and books and book chapters at 2.9% making far smaller contributions. This mix is roughly in line with the sector as a whole. It has been recognised that books and book chapters are underappreciated in relation to journals, and recommendations to increase the weighted points that they attract as proposed by ASSAf1 are awaiting approval by the DHET. and book chapters submitted, because the hurdle of independent reviewing is not always met by the publishing avenues chosen by authors. The University has become increasingly reliant on research funding in recent years as a larger proportion of its budget, and attention at university council level is being given to ensuring that appropriate systems and support structures for researchers are in place. I add my warm thanks and congratulations to all of our researchers, funders, collaborators and partners who contributed to the excellent research results of 2010. , A Publication of the Rhodes Research Office,compiled and edited by Jaine Roberts
- Full Text:
- Date Issued: 2010
- Authors: Rhodes University , Roberts, Jaine
- Date: 2010
- Language: English
- Type: Text
- Identifier: vital:565 , http://hdl.handle.net/10962/d1011968
- Description: From Introduction: In 2010, the total subsidy earning accredited research output count for Rhodes University of 615.3 units represents an increase of 9% on the previous year. By far the major contributor to this growth was the significant increase in both PhD (37.5% up on 2009) and Masters by thesis students (34.5% up on 2009). Rhodes contributed 3.3% of all accredited research output in the public higher education sector in 2010 (0.1% up on 2009). With 1.9% of academic staff in the system, Rhodes retained its place amongst the top three most productive universities as measured by accredited publications per academic. Rhodes exceeds the DHET research output norm for universities by 53%. In 2010, the total accredited publication output count for Rhodes University of 325.33 units represented a decline over 2009 of 7.3 percent. This followed two years of steep growth during which accredited research publication output grew by 28%. Accredited publication output for 2010 consisted mainly of journals at 89.9%, with conference proceedings at 7.2% and books and book chapters at 2.9% making far smaller contributions. This mix is roughly in line with the sector as a whole. It has been recognised that books and book chapters are underappreciated in relation to journals, and recommendations to increase the weighted points that they attract as proposed by ASSAf1 are awaiting approval by the DHET. and book chapters submitted, because the hurdle of independent reviewing is not always met by the publishing avenues chosen by authors. The University has become increasingly reliant on research funding in recent years as a larger proportion of its budget, and attention at university council level is being given to ensuring that appropriate systems and support structures for researchers are in place. I add my warm thanks and congratulations to all of our researchers, funders, collaborators and partners who contributed to the excellent research results of 2010. , A Publication of the Rhodes Research Office,compiled and edited by Jaine Roberts
- Full Text:
- Date Issued: 2010
Dancing with the devil: formative peer assessment and academic performance
- Mostert, Markus, Snowball, Jeanette D
- Authors: Mostert, Markus , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69301 , vital:29483 , https://doi.org/10.1080/07294360.2012.705262
- Description: Peer assessment can be important in developing active and independent learners, as well as providing more and faster feedback in large classes, compared to marking done by tutors. In addition, the evaluative, critical stance required by students in order to assess their peers' work encourages the development of higher-order cognitive skills. Changing roles from being assessed to being an assessor can also improve students' ability to judge and improve on their own work. However, peer assessment does have potential problems and there is some debate as to the appropriate academic level at which to implement it, the kinds of feedback that are given and the ways in which students respond. In addition, there is little evidence that peer assessment has an impact on academic performance. This research reports the results of an online peer assessment exercise for a macroeconomics essay conducted in a large Economics 1 class at Rhodes University. Of the 800 students, about half participated in the peer assessment exercise. Data were collected from students via a formal course evaluation. In addition, a sample of 50 essays was evaluated in terms of the relationship between peer marks and final (tutor) marks received and the impact that peer assessment had on the quality of the final essay submitted. An Ordinary Least Squares regression was used to investigate the impact of peer assessment participation on marks. Results showed that peer marks tended to ‘bunch’ in the 60–68% range, indicating the reluctance of peers to give very high or low marks. In general, peers gave more useful feedback on technical aspects, such as presentation and referencing (which were also the categories in which students most often made improvements), than on content. Regression analysis showed that peer assessment participation was not a significant determinant of final essay mark, but that economics ability and English language proficiency were.
- Full Text: false
- Date Issued: 2013
- Authors: Mostert, Markus , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69301 , vital:29483 , https://doi.org/10.1080/07294360.2012.705262
- Description: Peer assessment can be important in developing active and independent learners, as well as providing more and faster feedback in large classes, compared to marking done by tutors. In addition, the evaluative, critical stance required by students in order to assess their peers' work encourages the development of higher-order cognitive skills. Changing roles from being assessed to being an assessor can also improve students' ability to judge and improve on their own work. However, peer assessment does have potential problems and there is some debate as to the appropriate academic level at which to implement it, the kinds of feedback that are given and the ways in which students respond. In addition, there is little evidence that peer assessment has an impact on academic performance. This research reports the results of an online peer assessment exercise for a macroeconomics essay conducted in a large Economics 1 class at Rhodes University. Of the 800 students, about half participated in the peer assessment exercise. Data were collected from students via a formal course evaluation. In addition, a sample of 50 essays was evaluated in terms of the relationship between peer marks and final (tutor) marks received and the impact that peer assessment had on the quality of the final essay submitted. An Ordinary Least Squares regression was used to investigate the impact of peer assessment participation on marks. Results showed that peer marks tended to ‘bunch’ in the 60–68% range, indicating the reluctance of peers to give very high or low marks. In general, peers gave more useful feedback on technical aspects, such as presentation and referencing (which were also the categories in which students most often made improvements), than on content. Regression analysis showed that peer assessment participation was not a significant determinant of final essay mark, but that economics ability and English language proficiency were.
- Full Text: false
- Date Issued: 2013
Water footprint assessment of citrus production in South Africa: A case study of the Lower Sundays River Valley
- Munro, Samantha A, Fraser, Gavin C G, Snowball, Jeanette D, Pahlow, Markus
- Authors: Munro, Samantha A , Fraser, Gavin C G , Snowball, Jeanette D , Pahlow, Markus
- Date: 2016
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69240 , vital:29463 , https://doi.org/10.1016/j.jclepro.2016.06.142
- Description: Water footprint assessment is a developing method that is being increasingly applied to quantify water use, prioritise reductions, assess sustainability and provide information to achieve sustainable, efficient, and equitable water use. The objectives of this paper were to conduct a water footprint assessment of primary citrus production within the Lower Sundays River Valley in South Africa using local, high-resolution data and to examine indicators (water scarcity, pollution, efficiency, productivity and access) to determine the sustainability of blue, green and grey water footprints of a wet, dry and average year. Lemons were found to have the lowest blue and combined green-blue water footprint per ton of production across all climatic years, followed by soft citrus, valencias and navels. Valencias had the lowest, and navels the highest grey WF (relating to inorganic nitrogen). Lemons, despite their high crop water and fertiliser requirements, were regarded more economically efficient in comparison to valencias, soft citrus and navels, in that they provided higher net income and more employment hours per m3 of water in comparison to other citrus crops. In an average season, lemons generated approximately 39% more income per m3 of water than navels, despite navels being the dominant cultivar. Blue water consumption for citrus in the catchment was calculated to be 58.7 Mm3 for an average season and 89.2 Mm3 for a dry season. Due to an inter-basin transfer scheme, no physical water scarcity occurred, and both environmental and basic human needs are met. Water pollution levels related to nitrogen however, exceeded the assimilative capacity of the run-off in dry years. The area also experiences institutional and infrastructural scarcity and 14% of the population do not have access to piped water. Stakeholders and governments may use the results of water footprint assessments to determine the status of river basins, make evaluations for future water usage and the potential impacts of expanding agriculture and different management strategies. Including environmental and socio-economic indicators will also improve the integrity of water footprint assessments.
- Full Text: false
- Date Issued: 2016
- Authors: Munro, Samantha A , Fraser, Gavin C G , Snowball, Jeanette D , Pahlow, Markus
- Date: 2016
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69240 , vital:29463 , https://doi.org/10.1016/j.jclepro.2016.06.142
- Description: Water footprint assessment is a developing method that is being increasingly applied to quantify water use, prioritise reductions, assess sustainability and provide information to achieve sustainable, efficient, and equitable water use. The objectives of this paper were to conduct a water footprint assessment of primary citrus production within the Lower Sundays River Valley in South Africa using local, high-resolution data and to examine indicators (water scarcity, pollution, efficiency, productivity and access) to determine the sustainability of blue, green and grey water footprints of a wet, dry and average year. Lemons were found to have the lowest blue and combined green-blue water footprint per ton of production across all climatic years, followed by soft citrus, valencias and navels. Valencias had the lowest, and navels the highest grey WF (relating to inorganic nitrogen). Lemons, despite their high crop water and fertiliser requirements, were regarded more economically efficient in comparison to valencias, soft citrus and navels, in that they provided higher net income and more employment hours per m3 of water in comparison to other citrus crops. In an average season, lemons generated approximately 39% more income per m3 of water than navels, despite navels being the dominant cultivar. Blue water consumption for citrus in the catchment was calculated to be 58.7 Mm3 for an average season and 89.2 Mm3 for a dry season. Due to an inter-basin transfer scheme, no physical water scarcity occurred, and both environmental and basic human needs are met. Water pollution levels related to nitrogen however, exceeded the assimilative capacity of the run-off in dry years. The area also experiences institutional and infrastructural scarcity and 14% of the population do not have access to piped water. Stakeholders and governments may use the results of water footprint assessments to determine the status of river basins, make evaluations for future water usage and the potential impacts of expanding agriculture and different management strategies. Including environmental and socio-economic indicators will also improve the integrity of water footprint assessments.
- Full Text: false
- Date Issued: 2016
Rhodes University Research Report 2007
- Authors: Rhodes University
- Date: 2007
- Language: English
- Type: Text
- Identifier: vital:562 , http://hdl.handle.net/10962/d1011958
- Description: [From Introduction] For the past 8 years Rhodes University has maintained a research output record (based on publications and Masters and PhD graduates) which has placed it consistently amongst the top three universities in the country on the basis of outputs per capita academic staff member. The past year was no exception. Journal publications were the highest to date (261.9 units) and Masters and PhD graduates (274 units) are amongst the highest achieved, largely due to the record number of PhD graduates (33) in the Science Faculty. In recent years this per capita output has consistently been over 60% higher than the national average. An encouraging aspect of the journal publications in 2007 is the increase in the percentage of articles in subsidy earning journals. While it is appreciated that the most appropriate journals in certain fields of research are not always those that are on the Department of Education’s approved lists, it is financially critical to the University’s research effort and the University as a whole that subsidy earning outputs are maximised. Another positive outcome of the most recent audit of Rhodes’s research outputs (2006; 2007 data will only be available at the end of 2008) is that 89% of the publications in the form of books, chapters and conference proceedings submitted to the Department of Education were approved for subsidy. This is a significantly higher percentage approval than in the past. The award of two highly prestigious NRF/DST Research Chairs to Profs Tebello Nyokong and Christopher McQuaid as part of the first round of the SA Research Chairs Initiative was another major achievement. These Chairs will significantly enhance the research profile and productivity of the University as will the recent award of the highly prestigious Centre of Excellence in Nanotechnology to be headed by Prof Nyokong. Only three such centres of excellence have been established and were officially launched by the Minister of Science and Technology in November 2007. The Centre will be host to researchers from throughout South Africa and will focus on novel technologies for cancer treatment and the development of new biosensors for disease treatment and water contamination. An encouraging statistic recently released by the National Research Foundation indicates that Rhodes has the fourth highest percentage (15.4%) of rated researchers in the country which is an excellent achievement. NRF ratings are awarded to researchers in all disciplines who are regarded as national and international leaders in their fields. Amongst these researchers, three were also recognised by the University and were awarded the Vice-Chancellor’s Research Awards (see highlights section). Postgraduate students have once again been the cornerstone of much of the research activities in all Faculties and have contributed significantly to the research outputs of the University both as co-authors on publications and through the good graduation rates of Masters and PhD candidates. This is particularly evident for example in the Science Faculty, in which Masters and Doctoral students contributed to over 90% of the Faculty and 60% of the University’s outputs. A key factor in the high profile and success of postgraduates at Rhodes is the excellent supervision they receive and all supervisors are to be congratulated for their dedicated approach to what has become an increasingly onerous academic responsibility. They and the Research Office have benefited enormously from the very able support of the Postgraduate Liaison Committee chaired for a second year by Dan Parker. The work of this committee is highly valued. Finally, this will be my last contribution to the annual Rhodes Research Reports as I will be retiring at the end of 2008. I would like to wish my successor with responsibility for Research at Rhodes, the new DVC: R&D Dr Peter Clayton, every success in the future which I am confident will see research at the University going from strength to strength. I would also like to take the opportunity to express my sincere and grateful thanks to all those who have supported me and contributed to the success of Rhodes research in my past 10 years as Dean of Research. This includes two Vice-Chancellors, members of Senior Management, Deans, Heads of Department and staff and postgraduate students in both academic departments and administrative divisions. In particular, a very big thank you to all the staff who have worked in the Research Office and have made such a significant contribution over this past decade. Special mention must be made of my first Assistant, Moira Pogrund, who was instrumental in the establishment and success of the Research Office from its inception in 1998. She gave true meaning to the word efficiency and her outstanding contribution is being continued by the excellent work of her successor, Dr Heather Davies-Coleman. John Gillam has been a tower of strength in the management and administration of postgraduate financial aid and has been an invaluable advisor and confidant to countless postgraduate students over this period.
- Full Text:
- Date Issued: 2007
- Authors: Rhodes University
- Date: 2007
- Language: English
- Type: Text
- Identifier: vital:562 , http://hdl.handle.net/10962/d1011958
- Description: [From Introduction] For the past 8 years Rhodes University has maintained a research output record (based on publications and Masters and PhD graduates) which has placed it consistently amongst the top three universities in the country on the basis of outputs per capita academic staff member. The past year was no exception. Journal publications were the highest to date (261.9 units) and Masters and PhD graduates (274 units) are amongst the highest achieved, largely due to the record number of PhD graduates (33) in the Science Faculty. In recent years this per capita output has consistently been over 60% higher than the national average. An encouraging aspect of the journal publications in 2007 is the increase in the percentage of articles in subsidy earning journals. While it is appreciated that the most appropriate journals in certain fields of research are not always those that are on the Department of Education’s approved lists, it is financially critical to the University’s research effort and the University as a whole that subsidy earning outputs are maximised. Another positive outcome of the most recent audit of Rhodes’s research outputs (2006; 2007 data will only be available at the end of 2008) is that 89% of the publications in the form of books, chapters and conference proceedings submitted to the Department of Education were approved for subsidy. This is a significantly higher percentage approval than in the past. The award of two highly prestigious NRF/DST Research Chairs to Profs Tebello Nyokong and Christopher McQuaid as part of the first round of the SA Research Chairs Initiative was another major achievement. These Chairs will significantly enhance the research profile and productivity of the University as will the recent award of the highly prestigious Centre of Excellence in Nanotechnology to be headed by Prof Nyokong. Only three such centres of excellence have been established and were officially launched by the Minister of Science and Technology in November 2007. The Centre will be host to researchers from throughout South Africa and will focus on novel technologies for cancer treatment and the development of new biosensors for disease treatment and water contamination. An encouraging statistic recently released by the National Research Foundation indicates that Rhodes has the fourth highest percentage (15.4%) of rated researchers in the country which is an excellent achievement. NRF ratings are awarded to researchers in all disciplines who are regarded as national and international leaders in their fields. Amongst these researchers, three were also recognised by the University and were awarded the Vice-Chancellor’s Research Awards (see highlights section). Postgraduate students have once again been the cornerstone of much of the research activities in all Faculties and have contributed significantly to the research outputs of the University both as co-authors on publications and through the good graduation rates of Masters and PhD candidates. This is particularly evident for example in the Science Faculty, in which Masters and Doctoral students contributed to over 90% of the Faculty and 60% of the University’s outputs. A key factor in the high profile and success of postgraduates at Rhodes is the excellent supervision they receive and all supervisors are to be congratulated for their dedicated approach to what has become an increasingly onerous academic responsibility. They and the Research Office have benefited enormously from the very able support of the Postgraduate Liaison Committee chaired for a second year by Dan Parker. The work of this committee is highly valued. Finally, this will be my last contribution to the annual Rhodes Research Reports as I will be retiring at the end of 2008. I would like to wish my successor with responsibility for Research at Rhodes, the new DVC: R&D Dr Peter Clayton, every success in the future which I am confident will see research at the University going from strength to strength. I would also like to take the opportunity to express my sincere and grateful thanks to all those who have supported me and contributed to the success of Rhodes research in my past 10 years as Dean of Research. This includes two Vice-Chancellors, members of Senior Management, Deans, Heads of Department and staff and postgraduate students in both academic departments and administrative divisions. In particular, a very big thank you to all the staff who have worked in the Research Office and have made such a significant contribution over this past decade. Special mention must be made of my first Assistant, Moira Pogrund, who was instrumental in the establishment and success of the Research Office from its inception in 1998. She gave true meaning to the word efficiency and her outstanding contribution is being continued by the excellent work of her successor, Dr Heather Davies-Coleman. John Gillam has been a tower of strength in the management and administration of postgraduate financial aid and has been an invaluable advisor and confidant to countless postgraduate students over this period.
- Full Text:
- Date Issued: 2007
The effect of annealing and beta irradiation on thermoluminescence spectra of α-Al2O3: C, Mg
- Kalita, Jitumani M, Chithambo, Makaiko L
- Authors: Kalita, Jitumani M , Chithambo, Makaiko L
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/112875 , vital:33669 , https://doi.org/10.1016/j.jlumin.2017.12.036
- Description: The effect of annealing on thermoluminescence spectra of beta irradiated α-Al2O3:C,Mg has been studied. Measurements were made on an un-annealed sample and samples annealed at 600, 700 and 900 °C. A glow curve measured at 1 °C/s from samples irradiated to 1 Gy shows a high intensity peak at 163 °C and six secondary peaks of weaker intensity at 43, 73, 195, 280, 329 and 370 °C. When the samples are annealed at 700 or 900 °C, an additional secondary peak appears at 100 °C. The thermoluminescence spectrum of an un-annealed sample measured at 1 °C/s between 300 and 700 nm shows the main emission band at ~ 410 nm and subsidiary emission bands at ~ 325 and 485 nm. The emission from samples annealed at 700 and 900 °C show similar bands except for a decrease in intensity of the emission at 485 nm. The emission bands at 325, 410 and 485 nm are attributed to F+, F and F22+(2Mg) -centres respectively. The decrease of the emission band at 485 nm is deduced to be due to the destruction of the F22+(2Mg) centre at 700 °C. The emission bands are unaffected by irradiation dose between 10 and 320 Gy. However, when the sample is annealed at or beyond 700 °C, any effects on the F+ and F centres emission can be easier distinguished particularly for doses greater than 10 Gy.
- Full Text: false
- Date Issued: 2018
- Authors: Kalita, Jitumani M , Chithambo, Makaiko L
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/112875 , vital:33669 , https://doi.org/10.1016/j.jlumin.2017.12.036
- Description: The effect of annealing on thermoluminescence spectra of beta irradiated α-Al2O3:C,Mg has been studied. Measurements were made on an un-annealed sample and samples annealed at 600, 700 and 900 °C. A glow curve measured at 1 °C/s from samples irradiated to 1 Gy shows a high intensity peak at 163 °C and six secondary peaks of weaker intensity at 43, 73, 195, 280, 329 and 370 °C. When the samples are annealed at 700 or 900 °C, an additional secondary peak appears at 100 °C. The thermoluminescence spectrum of an un-annealed sample measured at 1 °C/s between 300 and 700 nm shows the main emission band at ~ 410 nm and subsidiary emission bands at ~ 325 and 485 nm. The emission from samples annealed at 700 and 900 °C show similar bands except for a decrease in intensity of the emission at 485 nm. The emission bands at 325, 410 and 485 nm are attributed to F+, F and F22+(2Mg) -centres respectively. The decrease of the emission band at 485 nm is deduced to be due to the destruction of the F22+(2Mg) centre at 700 °C. The emission bands are unaffected by irradiation dose between 10 and 320 Gy. However, when the sample is annealed at or beyond 700 °C, any effects on the F+ and F centres emission can be easier distinguished particularly for doses greater than 10 Gy.
- Full Text: false
- Date Issued: 2018
Rhodes University Research Report 2008
- Authors: Rhodes University
- Date: 2008
- Language: English
- Type: Text
- Identifier: vital:563 , http://hdl.handle.net/10962/d1011963
- Description: [From Preface] This report outlines the extent and quality of our research outputs for 2008. Rhodes possesses an admirable research milieu and culture that provides the space for intellectual development, debate, and the flourishing of ideas. As the smallest university in South Africa, we take special pride in Rhodes University having amongst the highest per capita research outputs. One of the core goals of a university is to produce knowledge, a public responsibility that Rhodes takes very seriously, and we continuously seek new opportunities to do so. Many of Rhodes University’s academics, departments, institutes, centres, and units are at the leading edge of research and are actively advancing knowledge in a range of disciplines and fields. During 2008, Rhodes launched three new centres. The DST/Mintek Nanotechnology Innovation Centre (Sensors) was founded under the directorship of Professor Tebello Nyokong; the Centre for Higher Education Research, Teaching & Learning, was formed out of a much expanded Academic Development Centre, under the leadership of the Dean of Teaching and Learning, Professor Chrissie Boughey; and the Centre for the Study of Democracy was launched under the leadership of Professor Stephen Friedman as a joint venture of Rhodes and the University of Johannesburg. A second DST/NRF South African Research Chair was launched in the field of Marine Biology, with Professor Christopher McQuaid as its incumbent. Rhodes’s first DST/NRF Chair, Professor Tebello Nyokong, in the area of Medicinal Chemistry and Nanotechnology, had an outstanding year, with accolades coming from a range of sources. She was officially recognized by the National Research Foundation as one of the most productive researchers in the country with 35 ISI indexed journal papers published during the year, an extraordinary achievement by anyone’s standard, and with a large number of additional accredited outputs by her and her group during the year. In the area of the creative arts, Mrs Janet Buckland of our Drama Department won special recognition as the recipient of the national Woman of the Year award promoted by Shopright-Checkers and SABC 2, in both the Arts and culture section and as the overall recipient. Professor Fackson Banda of our Journalism Department won the 2008 MISA (Media Institute of Southern Africa) Press Freedom Award. In the Geology Department, Professor Goonie Marsh was awarded the Geological Society of South Africa’s highest scientific award, the Draper Memorial Medal, in recognition of his outstanding contribution to geological sciences in general, and particularly for his research work in the petrology of volcanic rocks and igneous provinces in South Africa. The Vice-Chancellor's Distinguished Senior Research Award for 2008 went to Professor Peter Vale of the Department of Political and International Studies, for the national and international impact of his scholarly activities over a sustained period. The Vice-Chancellor's Book Award for 2008 went to Professor Dan Wylie of the Department of English, for Myth of Iron - Shaka in History (UKZN Press, 2008). Rhodes postgraduates continue to excel in winning prestigious international and local scholarships, including the Rhodes (Oxford), Mandela Rhodes, Flanagan, Commonwealth, and Fulbright. A major challenge facing South African Universities is the development of a new generation of teacher-scholars, one that Rhodes University has been engaging with for a number of years. We acknowledge the strong support of the Mellon Foundation, which has assisted us in creating a focused programme aimed at cultivating a new generation of black and women researchers, and in making a contribution towards transforming our academic body in the process. I am pleased to be able to announce that the Kresge Foundation has agreed to fund this initiative for a further four years. I extend my congratulations and thanks to all of our researchers, collaborators, funders, donors, and partners who contributed to making 2008 a year in which research at Rhodes University flourished. Your expertise, dedication, rigour and generosity make Rhodes University the rich and distinctive intellectual space that it is.
- Full Text:
- Date Issued: 2008
- Authors: Rhodes University
- Date: 2008
- Language: English
- Type: Text
- Identifier: vital:563 , http://hdl.handle.net/10962/d1011963
- Description: [From Preface] This report outlines the extent and quality of our research outputs for 2008. Rhodes possesses an admirable research milieu and culture that provides the space for intellectual development, debate, and the flourishing of ideas. As the smallest university in South Africa, we take special pride in Rhodes University having amongst the highest per capita research outputs. One of the core goals of a university is to produce knowledge, a public responsibility that Rhodes takes very seriously, and we continuously seek new opportunities to do so. Many of Rhodes University’s academics, departments, institutes, centres, and units are at the leading edge of research and are actively advancing knowledge in a range of disciplines and fields. During 2008, Rhodes launched three new centres. The DST/Mintek Nanotechnology Innovation Centre (Sensors) was founded under the directorship of Professor Tebello Nyokong; the Centre for Higher Education Research, Teaching & Learning, was formed out of a much expanded Academic Development Centre, under the leadership of the Dean of Teaching and Learning, Professor Chrissie Boughey; and the Centre for the Study of Democracy was launched under the leadership of Professor Stephen Friedman as a joint venture of Rhodes and the University of Johannesburg. A second DST/NRF South African Research Chair was launched in the field of Marine Biology, with Professor Christopher McQuaid as its incumbent. Rhodes’s first DST/NRF Chair, Professor Tebello Nyokong, in the area of Medicinal Chemistry and Nanotechnology, had an outstanding year, with accolades coming from a range of sources. She was officially recognized by the National Research Foundation as one of the most productive researchers in the country with 35 ISI indexed journal papers published during the year, an extraordinary achievement by anyone’s standard, and with a large number of additional accredited outputs by her and her group during the year. In the area of the creative arts, Mrs Janet Buckland of our Drama Department won special recognition as the recipient of the national Woman of the Year award promoted by Shopright-Checkers and SABC 2, in both the Arts and culture section and as the overall recipient. Professor Fackson Banda of our Journalism Department won the 2008 MISA (Media Institute of Southern Africa) Press Freedom Award. In the Geology Department, Professor Goonie Marsh was awarded the Geological Society of South Africa’s highest scientific award, the Draper Memorial Medal, in recognition of his outstanding contribution to geological sciences in general, and particularly for his research work in the petrology of volcanic rocks and igneous provinces in South Africa. The Vice-Chancellor's Distinguished Senior Research Award for 2008 went to Professor Peter Vale of the Department of Political and International Studies, for the national and international impact of his scholarly activities over a sustained period. The Vice-Chancellor's Book Award for 2008 went to Professor Dan Wylie of the Department of English, for Myth of Iron - Shaka in History (UKZN Press, 2008). Rhodes postgraduates continue to excel in winning prestigious international and local scholarships, including the Rhodes (Oxford), Mandela Rhodes, Flanagan, Commonwealth, and Fulbright. A major challenge facing South African Universities is the development of a new generation of teacher-scholars, one that Rhodes University has been engaging with for a number of years. We acknowledge the strong support of the Mellon Foundation, which has assisted us in creating a focused programme aimed at cultivating a new generation of black and women researchers, and in making a contribution towards transforming our academic body in the process. I am pleased to be able to announce that the Kresge Foundation has agreed to fund this initiative for a further four years. I extend my congratulations and thanks to all of our researchers, collaborators, funders, donors, and partners who contributed to making 2008 a year in which research at Rhodes University flourished. Your expertise, dedication, rigour and generosity make Rhodes University the rich and distinctive intellectual space that it is.
- Full Text:
- Date Issued: 2008
Rhodes University Research Report 2011
- Rhodes University, Rhodes University Research Office, Roberts, Jaine, Connan, Verna, Dore, Sally
- Authors: Rhodes University , Rhodes University Research Office , Roberts, Jaine , Connan, Verna , Dore, Sally
- Date: 2011
- Language: English
- Type: Text
- Identifier: vital:566 , http://hdl.handle.net/10962/d1011981
- Description: [From Introduction] Rhodes University continued to show a gratifying and steady increase in overall accredited research outputs in 2011, and individual increases were experienced in all categories of output. Overall accredited units increased to 639.6 (a 12.7% increase on 2010), with a similar percentage increase in the DHET per capita output figure, which kept Rhodes in the position of third most productive university in South Africa in terms of accredited research. 51% of the outputs were due to publications, 25% to PhD graduations, and 24% to Masters graduations by thesis. The PhD contribution represented a record year, and a 30% increase over the number graduating in the preceding year. Our journal output, (which accounts for 86% of our total accredited publishing output for higher education subsidy purposes) grew by 5.9% from the 2010 level (to 309.61 units in 2011). The previous year had seen a 3% decline in this category. Coupled with Rhodes’ high volume of accredited journal outputs in relation to its size, a very pleasing quality measure was that 90% of journal outputs (by far the highest proportion of universities in the sector) appeared in international accredited journals. Our output from accredited conference proceedings, (which in 2011 amounted to 7% of our total accredited publishing output) grew by 3.5% to 24.22 units - from a small base where year-on-year variance in either direction is common. The book outputs (which in 2011 amounted to 7% of our total accredited publishing output) increased by 162% - again from a small base (moving up to 25.02 units), where year-on-year variance is expected. This category had seen a negative growth of 60.6% in the previous year. add my warm thanks and congratulations to all of our researchers, funders, collaborators, partners and students who contributed to the excellent accredited research results of 2011, as well as generated the many forms of scholarship that are not counted in the accreditation exercise, but which contribute much to the rich intellectual space that is Rhodes. I also thank all of the administrators who played a critical role in preparing the university’s meticulous audited submission. , A publication of the Rhodes Research Office, compiled and edited by Jaine Roberts and Verna Connan. Design and Layout: Sally Dore.
- Full Text:
- Date Issued: 2011
- Authors: Rhodes University , Rhodes University Research Office , Roberts, Jaine , Connan, Verna , Dore, Sally
- Date: 2011
- Language: English
- Type: Text
- Identifier: vital:566 , http://hdl.handle.net/10962/d1011981
- Description: [From Introduction] Rhodes University continued to show a gratifying and steady increase in overall accredited research outputs in 2011, and individual increases were experienced in all categories of output. Overall accredited units increased to 639.6 (a 12.7% increase on 2010), with a similar percentage increase in the DHET per capita output figure, which kept Rhodes in the position of third most productive university in South Africa in terms of accredited research. 51% of the outputs were due to publications, 25% to PhD graduations, and 24% to Masters graduations by thesis. The PhD contribution represented a record year, and a 30% increase over the number graduating in the preceding year. Our journal output, (which accounts for 86% of our total accredited publishing output for higher education subsidy purposes) grew by 5.9% from the 2010 level (to 309.61 units in 2011). The previous year had seen a 3% decline in this category. Coupled with Rhodes’ high volume of accredited journal outputs in relation to its size, a very pleasing quality measure was that 90% of journal outputs (by far the highest proportion of universities in the sector) appeared in international accredited journals. Our output from accredited conference proceedings, (which in 2011 amounted to 7% of our total accredited publishing output) grew by 3.5% to 24.22 units - from a small base where year-on-year variance in either direction is common. The book outputs (which in 2011 amounted to 7% of our total accredited publishing output) increased by 162% - again from a small base (moving up to 25.02 units), where year-on-year variance is expected. This category had seen a negative growth of 60.6% in the previous year. add my warm thanks and congratulations to all of our researchers, funders, collaborators, partners and students who contributed to the excellent accredited research results of 2011, as well as generated the many forms of scholarship that are not counted in the accreditation exercise, but which contribute much to the rich intellectual space that is Rhodes. I also thank all of the administrators who played a critical role in preparing the university’s meticulous audited submission. , A publication of the Rhodes Research Office, compiled and edited by Jaine Roberts and Verna Connan. Design and Layout: Sally Dore.
- Full Text:
- Date Issued: 2011
Features of an annealing-induced thermoluminescence peak in α-Al2O3: C, Mg
- Kalita, Jitumani M, Chithambo, Makaiko L
- Authors: Kalita, Jitumani M , Chithambo, Makaiko L
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/116013 , vital:34289 , DOI: 10.1016/j.optmat.2017.05.034
- Description: We report the thermoluminescence glow curves of beta irradiated single crystal α-Al2O3:C,Mg after annealing at 700 and 900 °C. A glow curve measured at 1 °C/s from samples irradiated to 1 Gy following annealing at 700 and 900 °C shows a high intensity peak at 163 °C and seven secondary peaks of weaker intensity at 43, 73, 100, 195, 280, 329 and 370 °C. Comparing the position of the peaks in the annealed samples with those in an un-annealed one, it is observed that the peak at 100 °C appears only after annealing at and above 700 °C. Kinetic analysis of this annealing-induced peak was carried out using the initial rise, whole glow peak, peak shape, curve fitting and variable heating rate methods. The order of kinetics of the peak was determined as first order using various methods including the Tm-Tstop technique and the dependence of Tm on irradiation dose. The activation energy of the peak is about 1.01 eV and the frequency factor of the order of 1012 s−1. The peak was found to be affected by thermal quenching in analysis based on change of peak intensity with heating rate. The activation energy of thermal quenching was evaluated as 1.06 ± 0.08 eV. We speculate that the annealing-induced peak is due to formation of a new electron trap after destruction of the F22+(2 Mg) centre when the sample is annealed at 700 °C. The annealing-induced peak fades with storage between irradiation and measurement. It was also concluded that electrons from traps corresponding to secondary peaks get re-trapped at the main electron trap.
- Full Text: false
- Date Issued: 2017
- Authors: Kalita, Jitumani M , Chithambo, Makaiko L
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/116013 , vital:34289 , DOI: 10.1016/j.optmat.2017.05.034
- Description: We report the thermoluminescence glow curves of beta irradiated single crystal α-Al2O3:C,Mg after annealing at 700 and 900 °C. A glow curve measured at 1 °C/s from samples irradiated to 1 Gy following annealing at 700 and 900 °C shows a high intensity peak at 163 °C and seven secondary peaks of weaker intensity at 43, 73, 100, 195, 280, 329 and 370 °C. Comparing the position of the peaks in the annealed samples with those in an un-annealed one, it is observed that the peak at 100 °C appears only after annealing at and above 700 °C. Kinetic analysis of this annealing-induced peak was carried out using the initial rise, whole glow peak, peak shape, curve fitting and variable heating rate methods. The order of kinetics of the peak was determined as first order using various methods including the Tm-Tstop technique and the dependence of Tm on irradiation dose. The activation energy of the peak is about 1.01 eV and the frequency factor of the order of 1012 s−1. The peak was found to be affected by thermal quenching in analysis based on change of peak intensity with heating rate. The activation energy of thermal quenching was evaluated as 1.06 ± 0.08 eV. We speculate that the annealing-induced peak is due to formation of a new electron trap after destruction of the F22+(2 Mg) centre when the sample is annealed at 700 °C. The annealing-induced peak fades with storage between irradiation and measurement. It was also concluded that electrons from traps corresponding to secondary peaks get re-trapped at the main electron trap.
- Full Text: false
- Date Issued: 2017
Two Coega Kops west at Motherwell, 22 km north of Port Elizabeth
- Authors: Skead, C J (Cuthbert John)
- Date: 1994-05-25
- Subjects: Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:12454 , http://hdl.handle.net/10962/d1013861
- Description: 2 Coega Kops taken from west side. Fast being encroached by Motherwell black township.
- Full Text: false
- Date Issued: 1994-05-25
- Authors: Skead, C J (Cuthbert John)
- Date: 1994-05-25
- Subjects: Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:12454 , http://hdl.handle.net/10962/d1013861
- Description: 2 Coega Kops taken from west side. Fast being encroached by Motherwell black township.
- Full Text: false
- Date Issued: 1994-05-25
Cryptosepalum exfoliatum subsp. pseudotaxus
- Pocock, Mary Agard, Dold, Tony
- Authors: Pocock, Mary Agard , Dold, Tony
- Date: 1925-06-22 , 2016-05-13
- Subjects: Cryptosepalum exfoliatum , Fabaceae , Cryptosepalum , Cryptosepalum exfoliatum De Wild. subsp. pseudotaxus (Baker f.) P.A. Duvign. & Brenan
- Language: English
- Type: image , specimen , still image , herbarium specimen
- Identifier: http://hdl.handle.net/10962/178164 , vital:42917 , M. A. Pocock 6778 , Selmar Schonland Herbarium (GRA)
- Description: Image of original plant specimen held at Selmar Schonland Herbarium, Albany Museum/Rhodes University: M. A. Pocock 6778. Label: Cryptosepalum Pseudotaxus Bak.f = C. exfoliatum De Wild. Location: Kutsi : alt. 4200' : bark used for tying. Legit M.A. Pocock Date 22 June 1925 , Mary Agard Pocock Diary entry: June 22. [1925] : 'Found the bark tree (bark used for tying) in bloom ... got plenty of the curious little, very sweet-scented blooms.' Quoted from 'Bushmen, Botany and Baking Bread. Compiled and edited by Tony Dold and Jean Kelly (2018). , Vernacular plant names: Mbundu - Mukuvi, Mukuve. Bushman - Koviku , Trust: Mary Agard Pocock , Forms part of: Mary Agard Pocock collections
- Full Text: false
- Date Issued: 1925-06-22
- Authors: Pocock, Mary Agard , Dold, Tony
- Date: 1925-06-22 , 2016-05-13
- Subjects: Cryptosepalum exfoliatum , Fabaceae , Cryptosepalum , Cryptosepalum exfoliatum De Wild. subsp. pseudotaxus (Baker f.) P.A. Duvign. & Brenan
- Language: English
- Type: image , specimen , still image , herbarium specimen
- Identifier: http://hdl.handle.net/10962/178164 , vital:42917 , M. A. Pocock 6778 , Selmar Schonland Herbarium (GRA)
- Description: Image of original plant specimen held at Selmar Schonland Herbarium, Albany Museum/Rhodes University: M. A. Pocock 6778. Label: Cryptosepalum Pseudotaxus Bak.f = C. exfoliatum De Wild. Location: Kutsi : alt. 4200' : bark used for tying. Legit M.A. Pocock Date 22 June 1925 , Mary Agard Pocock Diary entry: June 22. [1925] : 'Found the bark tree (bark used for tying) in bloom ... got plenty of the curious little, very sweet-scented blooms.' Quoted from 'Bushmen, Botany and Baking Bread. Compiled and edited by Tony Dold and Jean Kelly (2018). , Vernacular plant names: Mbundu - Mukuvi, Mukuve. Bushman - Koviku , Trust: Mary Agard Pocock , Forms part of: Mary Agard Pocock collections
- Full Text: false
- Date Issued: 1925-06-22
Plan of the division of East London, British Kaffraria
- Thomas, Charles Neumann, 1840-1923, MacDonald, D, Murray, A E, Cooper, E T, Bright, H E R, Merriman, John Xavier, 1841-1926, Powell, J, Griffiths, E, Dumbleton, W D, Watermeyer, C P, Bryant, H, Colley, George Pomeroy, Sir, 1835-1881, Smith, C A, Gray, C J
- Authors: Thomas, Charles Neumann, 1840-1923 , MacDonald, D , Murray, A E , Cooper, E T , Bright, H E R , Merriman, John Xavier, 1841-1926 , Powell, J , Griffiths, E , Dumbleton, W D , Watermeyer, C P , Bryant, H , Colley, George Pomeroy, Sir, 1835-1881 , Smith, C A , Gray, C J
- Date: 1867
- Subjects: f-sa , Scale 1 inch = 400 Cape roods 30.5595° S, 22.9375° E , Cape of Good Hope (South Africa) Maps , Cape of Good Hope (South Africa) History 1795-1872 Maps
- Language: English
- Type: maps , digital maps , cartographic
- Identifier: http://hdl.handle.net/10962/104929 , vital:32446 , Cory Library for Humanities Research, Rhodes University Library, Grahamstown, South Africa , MP176
- Description: Plan of the division of East London, British Kaffraria, taken from general plans framed by D. Macdonald, A. E. Murray, E.T. Cooper, H.E.R. Bright, J.X. Merriman, J. Powell, E. Briffiths, W.D. Dumbleton, C. Watermeyer, H. Bryant, Lieutenant Colley, C.A. Smith and C.J. Gray, Governmetn Surveyors ; Compiled by C. Neumann Thomas, Surveyor General's Office, Cape Town, 1867. Scale 1" = 400 Cape Roods. 1 sheet 30" x 72". Showing Field Cornetcy areas and Leased Lots.
- Full Text: false
- Date Issued: 1867
- Authors: Thomas, Charles Neumann, 1840-1923 , MacDonald, D , Murray, A E , Cooper, E T , Bright, H E R , Merriman, John Xavier, 1841-1926 , Powell, J , Griffiths, E , Dumbleton, W D , Watermeyer, C P , Bryant, H , Colley, George Pomeroy, Sir, 1835-1881 , Smith, C A , Gray, C J
- Date: 1867
- Subjects: f-sa , Scale 1 inch = 400 Cape roods 30.5595° S, 22.9375° E , Cape of Good Hope (South Africa) Maps , Cape of Good Hope (South Africa) History 1795-1872 Maps
- Language: English
- Type: maps , digital maps , cartographic
- Identifier: http://hdl.handle.net/10962/104929 , vital:32446 , Cory Library for Humanities Research, Rhodes University Library, Grahamstown, South Africa , MP176
- Description: Plan of the division of East London, British Kaffraria, taken from general plans framed by D. Macdonald, A. E. Murray, E.T. Cooper, H.E.R. Bright, J.X. Merriman, J. Powell, E. Briffiths, W.D. Dumbleton, C. Watermeyer, H. Bryant, Lieutenant Colley, C.A. Smith and C.J. Gray, Governmetn Surveyors ; Compiled by C. Neumann Thomas, Surveyor General's Office, Cape Town, 1867. Scale 1" = 400 Cape Roods. 1 sheet 30" x 72". Showing Field Cornetcy areas and Leased Lots.
- Full Text: false
- Date Issued: 1867
Leonotis leonurus - Lion's ear
- Authors: Skead, C J (Cuthbert John)
- Date: 1960-05-22
- Subjects: Leonotis leonurus -- South Africa -- Photographs , Trees -- South Africa -- Photographs
- Language: English
- Type: mixed material , photographs , landscape photographs
- Identifier: http://hdl.handle.net/10962/122510 , vital:35298
- Description: Caption "Leonotis leonurus beside railway-line east of Berlin, C. P. 22-05-1960."
- Full Text: false
- Date Issued: 1960-05-22
- Authors: Skead, C J (Cuthbert John)
- Date: 1960-05-22
- Subjects: Leonotis leonurus -- South Africa -- Photographs , Trees -- South Africa -- Photographs
- Language: English
- Type: mixed material , photographs , landscape photographs
- Identifier: http://hdl.handle.net/10962/122510 , vital:35298
- Description: Caption "Leonotis leonurus beside railway-line east of Berlin, C. P. 22-05-1960."
- Full Text: false
- Date Issued: 1960-05-22
Inspection of telegraph line
- Authors: McKay, G. , Brownlee, C.
- Date: 1868
- Language: English
- Type: cartographic
- Identifier: http://hdl.handle.net/10962/105127 , vital:32467
- Description: Inspection of telegraph line - G. McKay, East London to Potsdam - C. Brownlee, King Williams Town to Potsdam; [comp. by G. McKay?].Scale not stated. 1 sheet 14½" x 22". Manuscript; may be dated "1868".
- Full Text: false
- Authors: McKay, G. , Brownlee, C.
- Date: 1868
- Language: English
- Type: cartographic
- Identifier: http://hdl.handle.net/10962/105127 , vital:32467
- Description: Inspection of telegraph line - G. McKay, East London to Potsdam - C. Brownlee, King Williams Town to Potsdam; [comp. by G. McKay?].Scale not stated. 1 sheet 14½" x 22". Manuscript; may be dated "1868".
- Full Text: false
Sediment connectivity in the upper Thina Catchment, Eastern Cape, South Africa
- Van der Waal, Benjamin Cornelis Wentsel
- Authors: Van der Waal, Benjamin Cornelis Wentsel
- Date: 2015
- Subjects: Soil erosion -- South Africa -- Eastern Cape , Sedimentation and deposition -- South Africa -- Eastern Cape , Watersheds -- South Africa -- Eastern Cape , Arroyos -- South Africa -- Eastern Cape , Sediment transport -- South Africa -- Eastern Cape , Soil conservation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4892 , http://hdl.handle.net/10962/d1019754
- Description: [Portion of abstract]: Sediment dynamics are influenced by transformed landscape connectivity in catchments worldwide. The upper Thina catchment, an important high rainfall resource in the northern Eastern Cape, South Africa, is an example of where ongoing subsistence farming on communal land has led to overgrazing and trampling that has initiated large erosive features (e.g. gullies) and river incision. The formation of gullies led to increased hillslope-channel connectivity and the resultant river incision decreased the channel-valley fill connectivity. These two changes in connectivity led to increased sediment export from the catchment that has various down-stream ecological and socio-economic impacts. This study investigates how the change in hillslope-channel and channel-valley fill connectivity has altered the sediment dynamics in the Vuvu catchment, a headwater tributary of the Thina River. A combination of methods were used to assess the changes in hillslope-channel and channel-valley fill connectivity. High resolution aerial images were used to map source features, such as fields, gullies, sheet erosion, landslides, roads and livestock tracks. Topographic and geological characteristics of the source features were extracted using a Geographic Information System. Furthermore, hillslope-channel pathways, such as the natural drainage network, continuous gullies, discontinuous gullies, roads and livestock tracks were mapped and analysed in terms of topographic and geological characteristics. Historic aerial images were assessed to calculate the date the larger gullies began forming. Recent aerial photos and cross sectional surveys of the valley fill were combined to map the various sediment sinks. Particle size and organic content were analysed for flood bench cores and terrace samples. The chronology of the flood benches was determined using unsupported Pb-210 and Cs-137 dating, and determined for the terraces using Optically Stimulated Luminescence dating. Quantitative and qualitative sediment tracing approaches, using mineral magnetic properties, were used to trace the origin of suspended sediment (collected during flood events), sediment stored in the flood benches and sediment stored in the terraces. Hydrological monitoring was used to assess the potential to store sediment on flood benches along the valley fill through flood bench inundation frequency. Hydrological and hydraulic modelling extended the measured inundation frequencies to a 73 year period and other cross sections along the valley fill. Furthermore, a future scenario of an increased vegetation cover and reduced hillslope-channel connectivity was assessed in terms of channel-valley fill inundation frequency.
- Full Text:
- Date Issued: 2015
- Authors: Van der Waal, Benjamin Cornelis Wentsel
- Date: 2015
- Subjects: Soil erosion -- South Africa -- Eastern Cape , Sedimentation and deposition -- South Africa -- Eastern Cape , Watersheds -- South Africa -- Eastern Cape , Arroyos -- South Africa -- Eastern Cape , Sediment transport -- South Africa -- Eastern Cape , Soil conservation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4892 , http://hdl.handle.net/10962/d1019754
- Description: [Portion of abstract]: Sediment dynamics are influenced by transformed landscape connectivity in catchments worldwide. The upper Thina catchment, an important high rainfall resource in the northern Eastern Cape, South Africa, is an example of where ongoing subsistence farming on communal land has led to overgrazing and trampling that has initiated large erosive features (e.g. gullies) and river incision. The formation of gullies led to increased hillslope-channel connectivity and the resultant river incision decreased the channel-valley fill connectivity. These two changes in connectivity led to increased sediment export from the catchment that has various down-stream ecological and socio-economic impacts. This study investigates how the change in hillslope-channel and channel-valley fill connectivity has altered the sediment dynamics in the Vuvu catchment, a headwater tributary of the Thina River. A combination of methods were used to assess the changes in hillslope-channel and channel-valley fill connectivity. High resolution aerial images were used to map source features, such as fields, gullies, sheet erosion, landslides, roads and livestock tracks. Topographic and geological characteristics of the source features were extracted using a Geographic Information System. Furthermore, hillslope-channel pathways, such as the natural drainage network, continuous gullies, discontinuous gullies, roads and livestock tracks were mapped and analysed in terms of topographic and geological characteristics. Historic aerial images were assessed to calculate the date the larger gullies began forming. Recent aerial photos and cross sectional surveys of the valley fill were combined to map the various sediment sinks. Particle size and organic content were analysed for flood bench cores and terrace samples. The chronology of the flood benches was determined using unsupported Pb-210 and Cs-137 dating, and determined for the terraces using Optically Stimulated Luminescence dating. Quantitative and qualitative sediment tracing approaches, using mineral magnetic properties, were used to trace the origin of suspended sediment (collected during flood events), sediment stored in the flood benches and sediment stored in the terraces. Hydrological monitoring was used to assess the potential to store sediment on flood benches along the valley fill through flood bench inundation frequency. Hydrological and hydraulic modelling extended the measured inundation frequencies to a 73 year period and other cross sections along the valley fill. Furthermore, a future scenario of an increased vegetation cover and reduced hillslope-channel connectivity was assessed in terms of channel-valley fill inundation frequency.
- Full Text:
- Date Issued: 2015
Spectral study of radioluminescence in carbon-doped aluminium oxide
- Nyirenda, Angel N, Chithambo, Makaiko L
- Authors: Nyirenda, Angel N , Chithambo, Makaiko L
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/110067 , vital:33220 , https://doi.org/10.1016/j.radmeas.2018.06.026
- Description: The spectral emission study of the radioluminescence (RL) measured from carbon-doped aluminium oxide (α-Al2O3:C) at various temperatures between 30 and 300∘C is reported. The energy-resolved RL emission spectra measured at room temperature show seven gaussian emission bands centred at 1.75, 1.79, 1.85, 2.22, 2.96, 3.72 and 4.44 eV. The 2.96-eV emission, associated with F-centres, is the primary RL emission whereas the narrow (R-line) emission centred at 1.79 eV, associated with Cr3+ impurity ions, is the most intense secondary emission. However, the intensity of 1.79-eV emission decreases with repeated RL measurements. The central emission energy for F-centres is constant throughout the temperature range of investigation. The full width at half maximum (FWHM) for the F-centre emission band increases with temperature whereas the F-centre peak intensity exhibits thermal quenching behaviour at temperatures above 160∘C. On the other hand, the emission energy for the R-line emission of Cr3+ is constant for temperatures between 30 and 160∘C, whereas its peak intensity generally decreases with temperature. F-centres experience strong-coupling in their crystallographic sites with estimated electron-lattice coupling parameters of S = 5.0 ± 0.9, Ep = 0.079 ± 0.008 eV and ν = 1.91 × 1013 Hz where S, Ep and ν are the Huang-Rhys factor, the phonon energy and the phonon frequency, respectively. The RL spectra recorded while ramping the temperature of a sample at a constant rate have been compared against conventional TL spectra.
- Full Text: false
- Date Issued: 2018
- Authors: Nyirenda, Angel N , Chithambo, Makaiko L
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/110067 , vital:33220 , https://doi.org/10.1016/j.radmeas.2018.06.026
- Description: The spectral emission study of the radioluminescence (RL) measured from carbon-doped aluminium oxide (α-Al2O3:C) at various temperatures between 30 and 300∘C is reported. The energy-resolved RL emission spectra measured at room temperature show seven gaussian emission bands centred at 1.75, 1.79, 1.85, 2.22, 2.96, 3.72 and 4.44 eV. The 2.96-eV emission, associated with F-centres, is the primary RL emission whereas the narrow (R-line) emission centred at 1.79 eV, associated with Cr3+ impurity ions, is the most intense secondary emission. However, the intensity of 1.79-eV emission decreases with repeated RL measurements. The central emission energy for F-centres is constant throughout the temperature range of investigation. The full width at half maximum (FWHM) for the F-centre emission band increases with temperature whereas the F-centre peak intensity exhibits thermal quenching behaviour at temperatures above 160∘C. On the other hand, the emission energy for the R-line emission of Cr3+ is constant for temperatures between 30 and 160∘C, whereas its peak intensity generally decreases with temperature. F-centres experience strong-coupling in their crystallographic sites with estimated electron-lattice coupling parameters of S = 5.0 ± 0.9, Ep = 0.079 ± 0.008 eV and ν = 1.91 × 1013 Hz where S, Ep and ν are the Huang-Rhys factor, the phonon energy and the phonon frequency, respectively. The RL spectra recorded while ramping the temperature of a sample at a constant rate have been compared against conventional TL spectra.
- Full Text: false
- Date Issued: 2018
Albany district farms, 1818-1874
- De Smidt, Abraham, 1829-1908, South Africa. Surveyor General
- Authors: De Smidt, Abraham, 1829-1908 , South Africa. Surveyor General
- Date: 1874
- Subjects: 1 inch = 200 Rhynland roods 30.5595° S, 22.9375° E , Farms -- South Africa -- Albany Maps , South Africa History 1806-1910 Maps
- Language: English
- Type: maps , digital maps , cartographic
- Identifier: http://hdl.handle.net/10962/109620 , vital:33161 , Cory Library for Humanities Research, Rhodes University Library, Grahamstown, South Africa , MP472
- Description: Diagrams and/or survayor's descriptions of the farms: Springvale, Proctor's Fontein, Komga, Boekenhoud Fontein (Petrus de Wit J. Wilmot), Assegaai Bush (Johannes Potgieter), Klip Fontein, Carel's Rust (Nics. Niemand), Latham's Farm (Joseph Latham), Matjes Kraal, Seven Fountains, Faber's Kraal (Fred. Potgieter), Hartebeest Pad (Diedk. Niemand), Melville Park (Thos. Butler, George Slater), Sharon (T.C. White), farm of J.D.P. Francis. Negative copy of original, 1874. Signed A. de Smidt.
- Full Text: false
- Date Issued: 1874
- Authors: De Smidt, Abraham, 1829-1908 , South Africa. Surveyor General
- Date: 1874
- Subjects: 1 inch = 200 Rhynland roods 30.5595° S, 22.9375° E , Farms -- South Africa -- Albany Maps , South Africa History 1806-1910 Maps
- Language: English
- Type: maps , digital maps , cartographic
- Identifier: http://hdl.handle.net/10962/109620 , vital:33161 , Cory Library for Humanities Research, Rhodes University Library, Grahamstown, South Africa , MP472
- Description: Diagrams and/or survayor's descriptions of the farms: Springvale, Proctor's Fontein, Komga, Boekenhoud Fontein (Petrus de Wit J. Wilmot), Assegaai Bush (Johannes Potgieter), Klip Fontein, Carel's Rust (Nics. Niemand), Latham's Farm (Joseph Latham), Matjes Kraal, Seven Fountains, Faber's Kraal (Fred. Potgieter), Hartebeest Pad (Diedk. Niemand), Melville Park (Thos. Butler, George Slater), Sharon (T.C. White), farm of J.D.P. Francis. Negative copy of original, 1874. Signed A. de Smidt.
- Full Text: false
- Date Issued: 1874