Time-resolved luminescence of low sensitivity quartz from crystalline rocks
- Chithambo, Makaiko L, Preusser, F, Ramseyer, K, Ogundare, F O
- Authors: Chithambo, Makaiko L , Preusser, F , Ramseyer, K , Ogundare, F O
- Date: 2007
- Language: English
- Type: text , article
- Identifier: vital:6801 , http://hdl.handle.net/10962/d1004164 , https://doi.org/10.1016/j.radmeas.2006.07.005
- Description: preprint , Time-resolved luminescence spectra of low sensitivity natural quartz from crystalline rocks are presented. The luminescence was pulse-stimulated at width using 470 nm blue light from quartz separated from plutonic, metamorphic, volcanic and hydrothermal samples. Measurements were made at 20 °C. All samples show evidence of a short lifetime component less than long although in several cases too weak in intensity to be evaluated accurately. On the other hand, the value of the principal lifetime component varies considerably being about in metamorphic quartz, in plutonic quartz, and in one example of hydrothermal quartz. The results illustrate a new feature of luminescence from quartz for which lifetimes less than or greater than have never been reported at room temperature before. It is argued that the thermal provenance of the quartz and so the annealing it will have experienced influences the size of the observed lifetime. In particular, the results are explained in terms of a model consisting of three luminescence centers with the dominant lifetime linked to preferential recombination at one center depending on the thermal history of the sample and hence the hole concentration of the center.
- Full Text:
- Date Issued: 2007
- Authors: Chithambo, Makaiko L , Preusser, F , Ramseyer, K , Ogundare, F O
- Date: 2007
- Language: English
- Type: text , article
- Identifier: vital:6801 , http://hdl.handle.net/10962/d1004164 , https://doi.org/10.1016/j.radmeas.2006.07.005
- Description: preprint , Time-resolved luminescence spectra of low sensitivity natural quartz from crystalline rocks are presented. The luminescence was pulse-stimulated at width using 470 nm blue light from quartz separated from plutonic, metamorphic, volcanic and hydrothermal samples. Measurements were made at 20 °C. All samples show evidence of a short lifetime component less than long although in several cases too weak in intensity to be evaluated accurately. On the other hand, the value of the principal lifetime component varies considerably being about in metamorphic quartz, in plutonic quartz, and in one example of hydrothermal quartz. The results illustrate a new feature of luminescence from quartz for which lifetimes less than or greater than have never been reported at room temperature before. It is argued that the thermal provenance of the quartz and so the annealing it will have experienced influences the size of the observed lifetime. In particular, the results are explained in terms of a model consisting of three luminescence centers with the dominant lifetime linked to preferential recombination at one center depending on the thermal history of the sample and hence the hole concentration of the center.
- Full Text:
- Date Issued: 2007
Indigenous languages and the media in South Africa:
- Authors: Kaschula, Russell H
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/175137 , vital:42546 , https://hdl.handle.net/10520/EJC15168
- Description: This article explores the status of South Africa’s indigenous languages and how they are being used in the media. More specifically, the performance of these languages in the print media, the broadcasting media and the Internet, is outlined. This is done against the backdrop of the South African Constitution, Section 6, which entrenches eleven official languages. Contrary to the Constitution’s provisions, it is found that the indigenous languages are achieving varying levels of success within the media. The reasons for this are outlined. Finally, the effects of globalisation on the indigenous languages within the media are assessed.
- Full Text:
- Date Issued: 2006
- Authors: Kaschula, Russell H
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/175137 , vital:42546 , https://hdl.handle.net/10520/EJC15168
- Description: This article explores the status of South Africa’s indigenous languages and how they are being used in the media. More specifically, the performance of these languages in the print media, the broadcasting media and the Internet, is outlined. This is done against the backdrop of the South African Constitution, Section 6, which entrenches eleven official languages. Contrary to the Constitution’s provisions, it is found that the indigenous languages are achieving varying levels of success within the media. The reasons for this are outlined. Finally, the effects of globalisation on the indigenous languages within the media are assessed.
- Full Text:
- Date Issued: 2006
JM Coetzee's Disgrace and the Task of the Imagination:
- Authors: Marais, Mike
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144126 , vital:38313 , DOI: 10.2979/JML.2006.29.2.75
- Description: In an early review of Disgrace, Jane Taylor first relates this novel's treatment of violence in post-apartheid South Africa to the European Enlightenment's legacy of the autonomy of the human subject (25), in terms of which each individual is conceived of as a living consciousness separated totally from every other consciousness, and then discusses J.M. Coetzee's postulation of the sympathetic imagination as a potential corrective to the violence attendant on monadic individuality. Taylor makes the telling point that, in the eighteenth century, the notions of sensibility, sympathy, and compassion, which the novel repeatedly invokes, were self-consciously developed as an ethical response to the instrumentalist logic of autonomous individuality and, in this regard, she cites Adam Smith's observation in The Theory of Moral Sentiments that "By the imagination we place ourselves in his situation, we conceive ourselves enduring all the same torments, we enter as it were into his body, and become in some measure the same person with him, and thence form some idea of his sensation" (qtd. in Taylor 25).
- Full Text:
- Date Issued: 2006
- Authors: Marais, Mike
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144126 , vital:38313 , DOI: 10.2979/JML.2006.29.2.75
- Description: In an early review of Disgrace, Jane Taylor first relates this novel's treatment of violence in post-apartheid South Africa to the European Enlightenment's legacy of the autonomy of the human subject (25), in terms of which each individual is conceived of as a living consciousness separated totally from every other consciousness, and then discusses J.M. Coetzee's postulation of the sympathetic imagination as a potential corrective to the violence attendant on monadic individuality. Taylor makes the telling point that, in the eighteenth century, the notions of sensibility, sympathy, and compassion, which the novel repeatedly invokes, were self-consciously developed as an ethical response to the instrumentalist logic of autonomous individuality and, in this regard, she cites Adam Smith's observation in The Theory of Moral Sentiments that "By the imagination we place ourselves in his situation, we conceive ourselves enduring all the same torments, we enter as it were into his body, and become in some measure the same person with him, and thence form some idea of his sensation" (qtd. in Taylor 25).
- Full Text:
- Date Issued: 2006
New Unity Movement Presidential Address
- Date: 2004-03
- Subjects: Government, Resistance to -- South Africa , South Africa -- History -- 20th century , South Africa -- Politics and government
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10948/32492 , vital:32118 , Bulk File 7
- Description: Presidential Addresses were delivered at each Annual conference of the New Unity Movement. This collection, though incomplete, has 18 items ranging from 1989 to 2013.
- Full Text: false
- Date Issued: 2004-03
- Date: 2004-03
- Subjects: Government, Resistance to -- South Africa , South Africa -- History -- 20th century , South Africa -- Politics and government
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10948/32492 , vital:32118 , Bulk File 7
- Description: Presidential Addresses were delivered at each Annual conference of the New Unity Movement. This collection, though incomplete, has 18 items ranging from 1989 to 2013.
- Full Text: false
- Date Issued: 2004-03
Umabatha: global and local
- Authors: Wright, Laurence
- Date: 2004
- Language: English
- Type: text , article
- Identifier: vital:7032 , http://hdl.handle.net/10962/d1007364 , https://doi.org/10.1080/00138390408691324
- Description: preprint , There can be few shows that test the dimensions and pitfalls of 'globalised' theatre as thoroughly as Welcome Msomi's Umabatha. The worldwide success of the show, in box-office terms, can hardly be argued with. And yet, in its very conception, the vehicle is so riven by intrinsic cultural, theatrical, class and 'nationist' tensions that different audiences cannot but reap utterly different experiences, depending on their own cultural and intellectual inheritance.The show is an instance where theatre practice (sometimes) obfuscates political and aesthetic discourse, showing how easily cultures miss each other and fail to connect, and how easily specific historical, geographical and imperial associations are swamped by shallow 'globalised' audience response.
- Full Text:
- Date Issued: 2004
- Authors: Wright, Laurence
- Date: 2004
- Language: English
- Type: text , article
- Identifier: vital:7032 , http://hdl.handle.net/10962/d1007364 , https://doi.org/10.1080/00138390408691324
- Description: preprint , There can be few shows that test the dimensions and pitfalls of 'globalised' theatre as thoroughly as Welcome Msomi's Umabatha. The worldwide success of the show, in box-office terms, can hardly be argued with. And yet, in its very conception, the vehicle is so riven by intrinsic cultural, theatrical, class and 'nationist' tensions that different audiences cannot but reap utterly different experiences, depending on their own cultural and intellectual inheritance.The show is an instance where theatre practice (sometimes) obfuscates political and aesthetic discourse, showing how easily cultures miss each other and fail to connect, and how easily specific historical, geographical and imperial associations are swamped by shallow 'globalised' audience response.
- Full Text:
- Date Issued: 2004
Port Elizabeth History: A Select Annotated Bibliography
- Authors: Baines, Gary F
- Date: 1998
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125742 , vital:35813 , https://doi.10.1080/02582479808671323
- Description: When I commenced my work on aspects of Port Elizabeth’s history in the late 1980s, there was no body of scholarly literature on which to draw. Since thena number of significant publications, both periodical articles and books, as well as theses have appeared, and something of a corpus of works on the city now exists. It seems appropriate to take stock of the current state of Port Elizabeth’s historiography by compiling a bibliography.
- Full Text:
- Date Issued: 1998
- Authors: Baines, Gary F
- Date: 1998
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125742 , vital:35813 , https://doi.10.1080/02582479808671323
- Description: When I commenced my work on aspects of Port Elizabeth’s history in the late 1980s, there was no body of scholarly literature on which to draw. Since thena number of significant publications, both periodical articles and books, as well as theses have appeared, and something of a corpus of works on the city now exists. It seems appropriate to take stock of the current state of Port Elizabeth’s historiography by compiling a bibliography.
- Full Text:
- Date Issued: 1998
National Bi-annual Conference - Treasurer's address
- FAWU
- Authors: FAWU
- Date: July 1997
- Subjects: FAWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/119042 , vital:34696
- Description: Comrade President, Honorary President, General Secretary and delegates, I present this report on behalf of the National Executive Committee (NEC). Since the last Conference the Union has faced many challenges and difficulties, but has despite this managed to play its rightfull role as a social partner by entering into the national debate of socio-economic transformation. This Conference has to further this advances by debating the crucial issues that underpin our advance to the total socio-economic transformation of our country. We also need to revisit and re-assess the pillars on which our Union rest, and strenghten them through policy formulation - and here I specifically want to isolate the areas of finance and administration. Later in this report I will attempt to highlight some of the crucial areas. Comrade President, allow me to express the NEC's appreciation to the staff for their dedication, loyalty and commitment, to FAWU over the past two years. We want to give them the assurance that their loyalty does not go by unnoticed, and that we will attempt to reward them for this excellent service. May I furthermore use this opportunity to thank the comrades in the National Executive Committee (NEC) and the National Office Bearers for their support and commitment over the past few months. It is through this commitment and dedication that we are able to present this Conference with a report. Comrades, the Annual Audited Financial Statements for the financial year will be tabled tommorrow. To the best of my knowledge this statements represents the financial position of the Union for the year ended 31 March 1997.
- Full Text:
- Date Issued: July 1997
- Authors: FAWU
- Date: July 1997
- Subjects: FAWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/119042 , vital:34696
- Description: Comrade President, Honorary President, General Secretary and delegates, I present this report on behalf of the National Executive Committee (NEC). Since the last Conference the Union has faced many challenges and difficulties, but has despite this managed to play its rightfull role as a social partner by entering into the national debate of socio-economic transformation. This Conference has to further this advances by debating the crucial issues that underpin our advance to the total socio-economic transformation of our country. We also need to revisit and re-assess the pillars on which our Union rest, and strenghten them through policy formulation - and here I specifically want to isolate the areas of finance and administration. Later in this report I will attempt to highlight some of the crucial areas. Comrade President, allow me to express the NEC's appreciation to the staff for their dedication, loyalty and commitment, to FAWU over the past two years. We want to give them the assurance that their loyalty does not go by unnoticed, and that we will attempt to reward them for this excellent service. May I furthermore use this opportunity to thank the comrades in the National Executive Committee (NEC) and the National Office Bearers for their support and commitment over the past few months. It is through this commitment and dedication that we are able to present this Conference with a report. Comrades, the Annual Audited Financial Statements for the financial year will be tabled tommorrow. To the best of my knowledge this statements represents the financial position of the Union for the year ended 31 March 1997.
- Full Text:
- Date Issued: July 1997
On the life history of the lesser gurnard (Scorpaeniformes: Triglidae) inhabiting the Agulhas Bank, South Africa
- Authors: Booth, Anthony J
- Date: 1997
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125434 , vital:35782 , https://doi.10.1111/j.1095-8649.1997.tb01133.x
- Description: Fishes of the genus Labeo are widely distributed throughout Africa and consist of at least 80 species which comprise 16.4% of the African cyprinid ichthyofauna (Reid 1985). Most labeo species are also commercially important throughout the African continent, having contributed significantly to various fisheries. Their roe (sensu caviar) is often harvested as an additional bycatch (Skelton et al. 1991). Despite their obvious importance, the few studies that have investigated aspects of their life history have been conducted on the larger commercial species (Lowe 1952, Mulder 1973, Balon et al. 1974, Potgieter 1974, Baird 1976, Tomasson et al. 1984, van Zyl et al. 1995).
- Full Text:
- Date Issued: 1997
- Authors: Booth, Anthony J
- Date: 1997
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125434 , vital:35782 , https://doi.10.1111/j.1095-8649.1997.tb01133.x
- Description: Fishes of the genus Labeo are widely distributed throughout Africa and consist of at least 80 species which comprise 16.4% of the African cyprinid ichthyofauna (Reid 1985). Most labeo species are also commercially important throughout the African continent, having contributed significantly to various fisheries. Their roe (sensu caviar) is often harvested as an additional bycatch (Skelton et al. 1991). Despite their obvious importance, the few studies that have investigated aspects of their life history have been conducted on the larger commercial species (Lowe 1952, Mulder 1973, Balon et al. 1974, Potgieter 1974, Baird 1976, Tomasson et al. 1984, van Zyl et al. 1995).
- Full Text:
- Date Issued: 1997
APDUSA Views
- Date: 1991-10
- Subjects: Government, Resistance to -- South Africa , South Africa -- History -- 20th century , South Africa -- Politics and government
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/10948/33506 , vital:32881 , Bulk File 7
- Description: APDUSA Views was published by the African People’s Democratic Union of Southern Africa (Natal), an affiliate of the New Unity Movement.
- Full Text: false
- Date Issued: 1991-10
- Date: 1991-10
- Subjects: Government, Resistance to -- South Africa , South Africa -- History -- 20th century , South Africa -- Politics and government
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/10948/33506 , vital:32881 , Bulk File 7
- Description: APDUSA Views was published by the African People’s Democratic Union of Southern Africa (Natal), an affiliate of the New Unity Movement.
- Full Text: false
- Date Issued: 1991-10
Cancer: science and society
- Authors: Duncan, John R
- Date: 1991-08-14
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/54280 , vital:26450 , ISBN 0-86810-227-X
- Description: [From introduction] The first question which needs to be answered is “What is Cancer?” This is in fact a very difficult question as, in many respects, cancer is a group of diverse diseases since it can affect every tissue in the body with different manifestations depending on the type of cancer. Can we therefore define this disease? I have synthesised a definition which I think covers the salient points. “Cancer is the uncontrolled or asynchronous growth of abnormal cells arising from a change in the cells DNA”. Let me explain this. Normal cells grow in a very controlled and synchronous manner. In going from a child to an adult hormones and other factors control the rate of growth of bones, muscles, etc.. They do this in a very controlled way by influencing the genetic material in the cell, viz. DNA. In adults there is also constant cell growth in, for example, skin and blood cells where new cells are replacing dead or old cells, again in a very controlled fashion. Many factors, which I will be discussing shortly, can disrupt this controlled cell growth and can further cause cells which normally are static or grow very slowly to enter into a state of high rates of cell growth. These cells which arc now growing in an uncontrolled fashion have been changed by these factors so that they no longer resemble the normal cells in the tissue in which they are found. They can therefore be regarded as abnormal cells.
- Full Text:
- Date Issued: 1991-08-14
- Authors: Duncan, John R
- Date: 1991-08-14
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/54280 , vital:26450 , ISBN 0-86810-227-X
- Description: [From introduction] The first question which needs to be answered is “What is Cancer?” This is in fact a very difficult question as, in many respects, cancer is a group of diverse diseases since it can affect every tissue in the body with different manifestations depending on the type of cancer. Can we therefore define this disease? I have synthesised a definition which I think covers the salient points. “Cancer is the uncontrolled or asynchronous growth of abnormal cells arising from a change in the cells DNA”. Let me explain this. Normal cells grow in a very controlled and synchronous manner. In going from a child to an adult hormones and other factors control the rate of growth of bones, muscles, etc.. They do this in a very controlled way by influencing the genetic material in the cell, viz. DNA. In adults there is also constant cell growth in, for example, skin and blood cells where new cells are replacing dead or old cells, again in a very controlled fashion. Many factors, which I will be discussing shortly, can disrupt this controlled cell growth and can further cause cells which normally are static or grow very slowly to enter into a state of high rates of cell growth. These cells which arc now growing in an uncontrolled fashion have been changed by these factors so that they no longer resemble the normal cells in the tissue in which they are found. They can therefore be regarded as abnormal cells.
- Full Text:
- Date Issued: 1991-08-14
Studies on the Zoarcidae, (Teleostei: Perciformes) of the Southern hemisphere. III. The Southwestern Pacific
- Anderson, M Eric, J.L.B. Smith Institute of Ichthyology
- Authors: Anderson, M Eric , J.L.B. Smith Institute of Ichthyology
- Date: 1990-07
- Subjects: Zoarcidae , Fishes -- South Africa
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/70348 , vital:29647 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
- Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 50 , The eelpout fauna of the southwestern Pacific presently includes 6 species, one of which, Pachycara garricki, is described as new. Full species accounts and illustrations are also provided for Melanostigma inexpectatum, Ophthalmolycus campbellensis, and Lycenchelys maoriorum, known previously only from the meager type series. Two species, Melanostigma gelatinosum, and M. vitiazi were redescribed in the first part of this series, but expanded diagnoses are provided here. Lycenchelys maoriomm and O. campbellensis are expected to be endemic to the New Zealand Plateau and perhaps Lord Howe Rise.
- Full Text:
- Date Issued: 1990-07
- Authors: Anderson, M Eric , J.L.B. Smith Institute of Ichthyology
- Date: 1990-07
- Subjects: Zoarcidae , Fishes -- South Africa
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/70348 , vital:29647 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
- Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 50 , The eelpout fauna of the southwestern Pacific presently includes 6 species, one of which, Pachycara garricki, is described as new. Full species accounts and illustrations are also provided for Melanostigma inexpectatum, Ophthalmolycus campbellensis, and Lycenchelys maoriorum, known previously only from the meager type series. Two species, Melanostigma gelatinosum, and M. vitiazi were redescribed in the first part of this series, but expanded diagnoses are provided here. Lycenchelys maoriomm and O. campbellensis are expected to be endemic to the New Zealand Plateau and perhaps Lord Howe Rise.
- Full Text:
- Date Issued: 1990-07
SACTWU - Shop Stewards Bulletin Vol 1 No.1
- SACTWU
- Authors: SACTWU
- Date: May 1990
- Subjects: SACTWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/116907 , vital:34457
- Description: SO wrote Bertolt Brecht, a German poet of the working people, in his famous poem “In Praise Of Learning”. Today, many years later, South Africa’s factories are filled with hungry persons, fighting for a living wage. One powerful weapon in that fight is knowledge. SACTWU hassetuptheEducationDep artm en t to meet the need for an educated worker leadership. This Bulletin is brought out to help arm worker leaders - with information, fresh ideas, new thoughts, skills - to fight the battle for a new South Africa. The Bulletin will carry articles on issues in the factory and outside of it. All issues which affect workers. Our lives are bigger than the factory only. It will carry stories on events in South Africa and also outside our country. The world today is small. Events in one country can affect people in another. Workers must take on interest in the whole world. It will seek to develop a thinking leadership, not one which follows blindly.
- Full Text:
- Date Issued: May 1990
- Authors: SACTWU
- Date: May 1990
- Subjects: SACTWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/116907 , vital:34457
- Description: SO wrote Bertolt Brecht, a German poet of the working people, in his famous poem “In Praise Of Learning”. Today, many years later, South Africa’s factories are filled with hungry persons, fighting for a living wage. One powerful weapon in that fight is knowledge. SACTWU hassetuptheEducationDep artm en t to meet the need for an educated worker leadership. This Bulletin is brought out to help arm worker leaders - with information, fresh ideas, new thoughts, skills - to fight the battle for a new South Africa. The Bulletin will carry articles on issues in the factory and outside of it. All issues which affect workers. Our lives are bigger than the factory only. It will carry stories on events in South Africa and also outside our country. The world today is small. Events in one country can affect people in another. Workers must take on interest in the whole world. It will seek to develop a thinking leadership, not one which follows blindly.
- Full Text:
- Date Issued: May 1990
The petrogenesis of the Kirwan Basalts of Dronning Maud Land, Antarctica
- Harris, Chris, Marsh, Julian S, Duncan, Andrew R, Erlank, Anthony J
- Authors: Harris, Chris , Marsh, Julian S , Duncan, Andrew R , Erlank, Anthony J
- Date: 1990
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145492 , vital:38443 , https://doi.org/10.1093/petrology/31.2.341
- Description: The 420 m thick sequence of Kirwan basalt crops out along the southernmost 50 km of the Kirwanveggen Escarpment (74°S, 6°W). There is little variation in major element chemistry of these basalts (SiO2 49·3–51·6 wt.%; MgO 5·1–6·6 wt.%), but the concentrations of certain incompatible elements (e.g., Zr) vary by factors of approximately two or more.
- Full Text: false
- Date Issued: 1990
- Authors: Harris, Chris , Marsh, Julian S , Duncan, Andrew R , Erlank, Anthony J
- Date: 1990
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145492 , vital:38443 , https://doi.org/10.1093/petrology/31.2.341
- Description: The 420 m thick sequence of Kirwan basalt crops out along the southernmost 50 km of the Kirwanveggen Escarpment (74°S, 6°W). There is little variation in major element chemistry of these basalts (SiO2 49·3–51·6 wt.%; MgO 5·1–6·6 wt.%), but the concentrations of certain incompatible elements (e.g., Zr) vary by factors of approximately two or more.
- Full Text: false
- Date Issued: 1990
The petrogenesis of the Kirwan Basalts of Dronning Maud Land, Antarctica
- Harris, Chris, Marsh, Julian S, Duncan, Andrew R, Erlank, Anthony J
- Authors: Harris, Chris , Marsh, Julian S , Duncan, Andrew R , Erlank, Anthony J
- Date: 1990
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145472 , vital:38441 , https://doi.org/10.1093/petrology/31.2.341
- Description: The 420 m thick sequence of Kirwan basalt crops out along the southernmost 50 km of the Kirwanveggen Escarpment (74°S, 6°W). There is little variation in major element chemistry of these basalts (SiO2 49·3–51·6 wt.%; MgO 5·1–6·6 wt.%), but the concentrations of certain incompatible elements (e.g., Zr) vary by factors of approximately two or more.
- Full Text: false
- Date Issued: 1990
- Authors: Harris, Chris , Marsh, Julian S , Duncan, Andrew R , Erlank, Anthony J
- Date: 1990
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145472 , vital:38441 , https://doi.org/10.1093/petrology/31.2.341
- Description: The 420 m thick sequence of Kirwan basalt crops out along the southernmost 50 km of the Kirwanveggen Escarpment (74°S, 6°W). There is little variation in major element chemistry of these basalts (SiO2 49·3–51·6 wt.%; MgO 5·1–6·6 wt.%), but the concentrations of certain incompatible elements (e.g., Zr) vary by factors of approximately two or more.
- Full Text: false
- Date Issued: 1990
Opening our eyes
- Cape Educational Computer Society (CECS)
- Authors: Cape Educational Computer Society (CECS)
- Date: 1989
- Subjects: Cape Educational Computer Society (CECS)
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/250511 , vital:52008
- Description: This is a bold statement and a difficult one for people who regard] computers as a tool of the rich. Yes the computer is a tool or the rich. But more and more of these weird little machines are finding their way into our backyards and ghettos, into the backrooms of our community organisations and even into our classrooms. Each of these computers can do what only the rich with million rand typographic equipment could do 10 years ago . Today ordinary people can bring out media of a quality that only highly trained professionals using specialised equipment used to be able to produce. This edition of CECS NEWS is proof of this. Almost the entire newsletter was produced by High School student members of CECS trained on a 5-day camp in June. “Computers For All” is not just an empty slogan but a possible reality. We decided at the camp to devote an entire issue to just this topic: Media on Computers.
- Full Text:
- Date Issued: 1989
- Authors: Cape Educational Computer Society (CECS)
- Date: 1989
- Subjects: Cape Educational Computer Society (CECS)
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/250511 , vital:52008
- Description: This is a bold statement and a difficult one for people who regard] computers as a tool of the rich. Yes the computer is a tool or the rich. But more and more of these weird little machines are finding their way into our backyards and ghettos, into the backrooms of our community organisations and even into our classrooms. Each of these computers can do what only the rich with million rand typographic equipment could do 10 years ago . Today ordinary people can bring out media of a quality that only highly trained professionals using specialised equipment used to be able to produce. This edition of CECS NEWS is proof of this. Almost the entire newsletter was produced by High School student members of CECS trained on a 5-day camp in June. “Computers For All” is not just an empty slogan but a possible reality. We decided at the camp to devote an entire issue to just this topic: Media on Computers.
- Full Text:
- Date Issued: 1989
Detention without trial: past, present and future
- Mathews, A S, Wylie, James Scott
- Authors: Mathews, A S , Wylie, James Scott
- Date: [1988]-02
- Subjects: Detention of persons -- South Africa , Human rights -- South Africa , Political prisoners -- South Africa
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/72512 , vital:30079
- Description: Detention without trial can be a formidable government weapon against political opponents. In South Africa this weapon has been fashioned into a multiple warhead. There are currently seven security law detention provisions on the statute book, of which one is dormant but can be activated by the State President. Non security law detention, for example detention under drug laws, will not be discussed in this paper. While the seven detention laws are of varying severity and serve different purposes, they are best classified and explained under two main categories or groups - preventive detention and pre-trial detention.
- Full Text:
- Date Issued: [1988]-02
- Authors: Mathews, A S , Wylie, James Scott
- Date: [1988]-02
- Subjects: Detention of persons -- South Africa , Human rights -- South Africa , Political prisoners -- South Africa
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/72512 , vital:30079
- Description: Detention without trial can be a formidable government weapon against political opponents. In South Africa this weapon has been fashioned into a multiple warhead. There are currently seven security law detention provisions on the statute book, of which one is dormant but can be activated by the State President. Non security law detention, for example detention under drug laws, will not be discussed in this paper. While the seven detention laws are of varying severity and serve different purposes, they are best classified and explained under two main categories or groups - preventive detention and pre-trial detention.
- Full Text:
- Date Issued: [1988]-02
Problems of species definition in Lake Malawi cichlid fishes (Pisces: Cichlidae)
- Lewis, Digby S C, J.L.B. Smith Institute of Ichthyology
- Authors: Lewis, Digby S C , J.L.B. Smith Institute of Ichthyology
- Date: 1982-09
- Subjects: Cichlids -- Nyasa, Lake , Fishes
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/69918 , vital:29595 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
- Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 23 , The evolution of the cichlid species flock in Lake Malawi has taken place very rapidly and resulted in the proliferation of a large number of species many of which are similar to one another. This has given rise to a situation in which traditional methods of distinguishing species based on preserved specimens are often of limited value. There are many instances of different species having almost identical morphologies, of single populations of one species showing considerable morphological variation and of marked geographical intraspecific variation. Polymorphism is considered not to be as widespread as previously thought, and pronounced random intraspecific colour variation within a population is discounted. Sympatric sibling species may be distinguished by observing behavioural and habitat differences in the field, but no means has been devised for ascertaining whether morphologically and behaviourally similar allopatric forms are specifically distinct. Lack of access to fresh specimens and lack of information on distribution and habitat have resulted in numerous errors appearing in taxonomic works on Lake Malawi cichlids. Great care is needed when attempting scientific descriptions of cichlid species from the African Great Lakes, and it is suggested that such work be left to specialists with knowledge of living and fresh fish in these lakes.
- Full Text:
- Date Issued: 1982-09
- Authors: Lewis, Digby S C , J.L.B. Smith Institute of Ichthyology
- Date: 1982-09
- Subjects: Cichlids -- Nyasa, Lake , Fishes
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/69918 , vital:29595 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
- Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 23 , The evolution of the cichlid species flock in Lake Malawi has taken place very rapidly and resulted in the proliferation of a large number of species many of which are similar to one another. This has given rise to a situation in which traditional methods of distinguishing species based on preserved specimens are often of limited value. There are many instances of different species having almost identical morphologies, of single populations of one species showing considerable morphological variation and of marked geographical intraspecific variation. Polymorphism is considered not to be as widespread as previously thought, and pronounced random intraspecific colour variation within a population is discounted. Sympatric sibling species may be distinguished by observing behavioural and habitat differences in the field, but no means has been devised for ascertaining whether morphologically and behaviourally similar allopatric forms are specifically distinct. Lack of access to fresh specimens and lack of information on distribution and habitat have resulted in numerous errors appearing in taxonomic works on Lake Malawi cichlids. Great care is needed when attempting scientific descriptions of cichlid species from the African Great Lakes, and it is suggested that such work be left to specialists with knowledge of living and fresh fish in these lakes.
- Full Text:
- Date Issued: 1982-09