Opening of Parliament in Grahamstown 1864
- Subjects: Grahamstown (South Africa) -- Pictorial works , Parliament (South Africa) -- history
- Type: Image
- Identifier: vital:14218 , http://hdl.handle.net/10962/d1018142 , MS 10 542 , CD 55
- Description: Showing the opening of the only Parliamentary session ever held away from Cape Town.
- Full Text: false
- Subjects: Grahamstown (South Africa) -- Pictorial works , Parliament (South Africa) -- history
- Type: Image
- Identifier: vital:14218 , http://hdl.handle.net/10962/d1018142 , MS 10 542 , CD 55
- Description: Showing the opening of the only Parliamentary session ever held away from Cape Town.
- Full Text: false
Opening of Quad II
- Subjects: Rhodes University -- Buildings -- Photographs Rhodes University -- History -- Photographs
- Type: Image
- Identifier: http://hdl.handle.net/10962/36548 , vital:24563 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 6609
- Full Text: false
- Subjects: Rhodes University -- Buildings -- Photographs Rhodes University -- History -- Photographs
- Type: Image
- Identifier: http://hdl.handle.net/10962/36548 , vital:24563 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 6609
- Full Text: false
Opening of Rhodes Summer School 1975 - East London Library, November 3rd 1975
- Authors: Henderson, Derek Scott
- Subjects: Rhodes University
- Language: English
- Type: Text
- Identifier: vital:7333 , http://hdl.handle.net/10962/d1017061
- Full Text:
- Authors: Henderson, Derek Scott
- Subjects: Rhodes University
- Language: English
- Type: Text
- Identifier: vital:7333 , http://hdl.handle.net/10962/d1017061
- Full Text:
Opening of Robert Niven Trust school at Amanzi farm 1978
- Authors: Henderson, Derek Scott
- Language: English
- Type: Text
- Identifier: vital:7368 , http://hdl.handle.net/10962/d1017248
- Full Text:
- Authors: Henderson, Derek Scott
- Language: English
- Type: Text
- Identifier: vital:7368 , http://hdl.handle.net/10962/d1017248
- Full Text:
Opening of the NIC - Sensors by the Minister of Science Me Naledi Pandor
- Authors: Nyokong, Tebello
- Identifier: vital:7229 , http://hdl.handle.net/10962/d1006048
- Description: Opening of the NIC - Sensors by the Minister of Science Me Naledi Pandor on 13 September 2010
- Full Text: false
- Authors: Nyokong, Tebello
- Identifier: vital:7229 , http://hdl.handle.net/10962/d1006048
- Description: Opening of the NIC - Sensors by the Minister of Science Me Naledi Pandor on 13 September 2010
- Full Text: false
Opening Professor Scully's multi-image presentation
- Authors: Henderson, Derek Scott
- Language: English
- Type: Text
- Identifier: vital:7385 , http://hdl.handle.net/10962/d1017274
- Full Text:
- Authors: Henderson, Derek Scott
- Language: English
- Type: Text
- Identifier: vital:7385 , http://hdl.handle.net/10962/d1017274
- Full Text:
Optical nonlinearities and photophysicochemical behaviour of green and blue forms of lutetium bisphthalocyanines
- Sekhosana, Kutloano Edward, Amuhaya, Edith, Mack, John, Nyokong, Tebello
- Authors: Sekhosana, Kutloano Edward , Amuhaya, Edith , Mack, John , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7316 , http://hdl.handle.net/10962/d1020543
- Description: A rare earth sandwich-type phthalocyanine: bis-{2,3,9,10,16,17,23,24-octa(4-tert-butylphenoxy) phthalocyaninato} lutetium(III) has been synthesized. The photophysical and nonlinear optical behavior of both the “green” and “blue” forms ([LuIIIPc2] and [LuIIIPc2]−, respectively) of the complex have been investigated. High triplet state and singlet oxygen quantum yield values were obtained for the neutral blue form which contains no unpaired electrons. Relatively high third order susceptibility and hyperpolarizability values of the order of 10−10 and 10−28 esu were obtained for both the green and blue forms, respectively. A very low threshold intensity of 0.00051 J cm−2 was obtained for the blue form. Hence the complex shows promise for non-linear optical applications. , Original publication is available at http://dx.doi.org/10.1039/C4TC00505H
- Full Text:
- Authors: Sekhosana, Kutloano Edward , Amuhaya, Edith , Mack, John , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7316 , http://hdl.handle.net/10962/d1020543
- Description: A rare earth sandwich-type phthalocyanine: bis-{2,3,9,10,16,17,23,24-octa(4-tert-butylphenoxy) phthalocyaninato} lutetium(III) has been synthesized. The photophysical and nonlinear optical behavior of both the “green” and “blue” forms ([LuIIIPc2] and [LuIIIPc2]−, respectively) of the complex have been investigated. High triplet state and singlet oxygen quantum yield values were obtained for the neutral blue form which contains no unpaired electrons. Relatively high third order susceptibility and hyperpolarizability values of the order of 10−10 and 10−28 esu were obtained for both the green and blue forms, respectively. A very low threshold intensity of 0.00051 J cm−2 was obtained for the blue form. Hence the complex shows promise for non-linear optical applications. , Original publication is available at http://dx.doi.org/10.1039/C4TC00505H
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Optical nonlinearities in non-peripherally substituted pyridyloxy phthalocyanines: a combined effect of symmetry, ring-strain and demetallation
- Sanusi, Kayode, Antunes, Edith M, Nyokong, Tebello
- Authors: Sanusi, Kayode , Antunes, Edith M , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7301 , http://hdl.handle.net/10962/d1020375
- Description: The optical nonlinearities of six non-peripherally-substituted pyridyloxy phthalocyanines have been studied at 532 nm using a nanosecond Z-scan technique in a dimethyl sulphoxide solution. Ring-strain effects and the absence of a metal center were found to greatly reduce the inherent high nonlinearities expected of some of these phthalocyanine complexes. Of the six molecules investigated, 1(4),8(11),15(18),22(25)-tetrakis-(2-pyridyloxy)phthalocyaninato lead(II) 3, 1(4),8(11),15(18),22(25)-tetrakis-(2-pyridyloxy)phthalocyanine 5, and 1(4),8(11),15(18),22(25)-tetrakis-(4-pyridyloxy)phthalocyanine 6 were found to exhibit negligible nonlinear optical behavior, due to either the absence of asymmetry or central metal and/or the presence of a ring-strain effect. A two-photon absorption process was found to be the major contributor to the observed reverse saturable absorption (RSA) in 1(4),8(11),15(18),22(25)-tetrakis-(4-pyridyloxy)phthalocyaninato lead(II) 4, 1(4)-mono-(2-pyridyloxy)phthalocyaninato lead(II) 7, and 1(4)-mono-(4-pyridyloxy)phthalocyaninato lead(II) 8, with large two-photon absorption cross-section, high hyperpolarizability and high third-order susceptibility values in the range of 4.53 × 10−43–5.33 × 10−42 cm4 s per photon, 1.61 × 10−28–1.89 × 10−27 esu and 9.73 × 10−12–7.05 × 10−11 esu respectively. , Original publication is available at http://dx.doi.org/10.1039/C3DT52462K , Arbortext Advanced Print Publisher 9.1.520/W Unicode , Acrobat Distiller 10.0.0 (Windows); modified using iText� 5.3.3 �2000-2012 1T3XT BVBA (AGPL-version)
- Full Text:
- Authors: Sanusi, Kayode , Antunes, Edith M , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7301 , http://hdl.handle.net/10962/d1020375
- Description: The optical nonlinearities of six non-peripherally-substituted pyridyloxy phthalocyanines have been studied at 532 nm using a nanosecond Z-scan technique in a dimethyl sulphoxide solution. Ring-strain effects and the absence of a metal center were found to greatly reduce the inherent high nonlinearities expected of some of these phthalocyanine complexes. Of the six molecules investigated, 1(4),8(11),15(18),22(25)-tetrakis-(2-pyridyloxy)phthalocyaninato lead(II) 3, 1(4),8(11),15(18),22(25)-tetrakis-(2-pyridyloxy)phthalocyanine 5, and 1(4),8(11),15(18),22(25)-tetrakis-(4-pyridyloxy)phthalocyanine 6 were found to exhibit negligible nonlinear optical behavior, due to either the absence of asymmetry or central metal and/or the presence of a ring-strain effect. A two-photon absorption process was found to be the major contributor to the observed reverse saturable absorption (RSA) in 1(4),8(11),15(18),22(25)-tetrakis-(4-pyridyloxy)phthalocyaninato lead(II) 4, 1(4)-mono-(2-pyridyloxy)phthalocyaninato lead(II) 7, and 1(4)-mono-(4-pyridyloxy)phthalocyaninato lead(II) 8, with large two-photon absorption cross-section, high hyperpolarizability and high third-order susceptibility values in the range of 4.53 × 10−43–5.33 × 10−42 cm4 s per photon, 1.61 × 10−28–1.89 × 10−27 esu and 9.73 × 10−12–7.05 × 10−11 esu respectively. , Original publication is available at http://dx.doi.org/10.1039/C3DT52462K , Arbortext Advanced Print Publisher 9.1.520/W Unicode , Acrobat Distiller 10.0.0 (Windows); modified using iText� 5.3.3 �2000-2012 1T3XT BVBA (AGPL-version)
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Optical properties and electronic structures of axially-ligated group 9 porphyrins
- Wang, Bei-Bei, Zuo, Huiping, Mack, John, Majumdar, Poulomi, Nyokong, Tebello, Chan, Kin Shing, Shen, Zhen
- Authors: Wang, Bei-Bei , Zuo, Huiping , Mack, John , Majumdar, Poulomi , Nyokong, Tebello , Chan, Kin Shing , Shen, Zhen
- Language: English
- Type: Article
- Identifier: vital:7295 , http://hdl.handle.net/10962/d1020358
- Description: A series of group 9 metal tetra-(p-tolyl)-porphyrin (M(ttp), M = Co(II), Rh(III), Ir(III)) complexes with axial phenyl substituents have been synthesized and characterized. An aryl bromide cleavage reaction of transition metal complexes was used to prepare the complexes from Co(ttp), Rh(ttp)Cl and Ir(ttp)COCl, respectively. Magnetic circular dichroism (MCD) spectroscopy and TD-DFT calculations have been used to study trends in the optical spectra and electronic structures. The effect of introducing different para-substituents on the phenyl substituents was examined. During fluorescence emission studies, phosphorescence was observed for the Ir(III) complexes in the near infrared (NIR) region. , Original publication is available at http://dx.doi.org/10.1142/S108842461550073X
- Full Text: false
- Authors: Wang, Bei-Bei , Zuo, Huiping , Mack, John , Majumdar, Poulomi , Nyokong, Tebello , Chan, Kin Shing , Shen, Zhen
- Language: English
- Type: Article
- Identifier: vital:7295 , http://hdl.handle.net/10962/d1020358
- Description: A series of group 9 metal tetra-(p-tolyl)-porphyrin (M(ttp), M = Co(II), Rh(III), Ir(III)) complexes with axial phenyl substituents have been synthesized and characterized. An aryl bromide cleavage reaction of transition metal complexes was used to prepare the complexes from Co(ttp), Rh(ttp)Cl and Ir(ttp)COCl, respectively. Magnetic circular dichroism (MCD) spectroscopy and TD-DFT calculations have been used to study trends in the optical spectra and electronic structures. The effect of introducing different para-substituents on the phenyl substituents was examined. During fluorescence emission studies, phosphorescence was observed for the Ir(III) complexes in the near infrared (NIR) region. , Original publication is available at http://dx.doi.org/10.1142/S108842461550073X
- Full Text: false
- Authors: Jill
- Identifier: http://hdl.handle.net/10962/110045 , vital:33216
- Full Text: false
Optimal cycle dating of large financial time series
- Identifier: http://hdl.handle.net/10948/17735 , vital:28445
- Full Text:
- Identifier: http://hdl.handle.net/10948/17735 , vital:28445
- Full Text:
Optimisation of clearcoat viscosity
- Identifier: http://vital.seals.ac.za8080/10948/28319 , http://hdl.handle.net/10948/4845 , vital:20705
- Full Text: false
- Identifier: http://vital.seals.ac.za8080/10948/28319 , http://hdl.handle.net/10948/4845 , vital:20705
- Full Text: false
Optimisation of cold rolling process parameters to improve surface quality of the AA 3003-H22 treadbright coils
- Authors: Makhanya, Lehlohonolo
- Subjects: Aluminum alloys
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9611 , http://hdl.handle.net/10948/554 , Aluminum alloys
- Description: The main objective of this dissertation was to investigate how cold rolling process parameters could be optimised to improve surface quality of the AA 3003 H22 treadbright coils. This treadbright product is one of Hulett Aluminium’s main products and is exported mainly to the North American market. One of its critical requirements is a defect-free bright surface. The literature review was conducted with particular focus on the effects of selected parameters or settings with respect to surface quality and a chapter outlining these aspects has been included. It was clear from the literature review that selected parameters do affect the surface quality and if adjusted accordingly can improve surface quality on treadbright coils. Subsequent chapters after the literature review outline how the tests were conducted, procedures followed and equipments used from the cold rolling machine to laboratories. Surface appearance results after each parameter was adjusted, showed that the surface quality did improve and even got better when other parameters like the colouring roll angle and percentage reduction were adjusted. Correct working limits within which each parameter would yield acceptable surface quality were also established. All experiments conducted had no influence on the microstructure of the metal as it remained the same throughout each experiment. The same has been found with the mechanical properties as percentage reductions experiments led to no change in tensile strength, proof strength and percentage elongation. In conclusion, this research has proved that cold rolling process parameters selected did affect the product surface quality. If controlled they can be used to optimise the surface quality on the treadbright product as required by Hulett Aluminium and its customers.
- Full Text:
- Authors: Makhanya, Lehlohonolo
- Subjects: Aluminum alloys
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9611 , http://hdl.handle.net/10948/554 , Aluminum alloys
- Description: The main objective of this dissertation was to investigate how cold rolling process parameters could be optimised to improve surface quality of the AA 3003 H22 treadbright coils. This treadbright product is one of Hulett Aluminium’s main products and is exported mainly to the North American market. One of its critical requirements is a defect-free bright surface. The literature review was conducted with particular focus on the effects of selected parameters or settings with respect to surface quality and a chapter outlining these aspects has been included. It was clear from the literature review that selected parameters do affect the surface quality and if adjusted accordingly can improve surface quality on treadbright coils. Subsequent chapters after the literature review outline how the tests were conducted, procedures followed and equipments used from the cold rolling machine to laboratories. Surface appearance results after each parameter was adjusted, showed that the surface quality did improve and even got better when other parameters like the colouring roll angle and percentage reduction were adjusted. Correct working limits within which each parameter would yield acceptable surface quality were also established. All experiments conducted had no influence on the microstructure of the metal as it remained the same throughout each experiment. The same has been found with the mechanical properties as percentage reductions experiments led to no change in tensile strength, proof strength and percentage elongation. In conclusion, this research has proved that cold rolling process parameters selected did affect the product surface quality. If controlled they can be used to optimise the surface quality on the treadbright product as required by Hulett Aluminium and its customers.
- Full Text:
Order of Mapungubwe
- Authors: Nyokong, Tebello
- Identifier: vital:7166 , http://hdl.handle.net/10962/d1005916
- Description: Professor Nyokong was bestowed with the Order of Mapungubwe: Bronze by the State President Thabo Mbeki - 2005
- Full Text: false
- Authors: Nyokong, Tebello
- Identifier: vital:7166 , http://hdl.handle.net/10962/d1005916
- Description: Professor Nyokong was bestowed with the Order of Mapungubwe: Bronze by the State President Thabo Mbeki - 2005
- Full Text: false
Organosilicon compounds as fluorescent chemosensors for fluoride anion recognition
- Gai, Lizhi, Mack, John, Lu, Hua, Nyokong, Tebello, Li, Zhifang, Kobayashi, Nagao, Shen, Zhen
- Authors: Gai, Lizhi , Mack, John , Lu, Hua , Nyokong, Tebello , Li, Zhifang , Kobayashi, Nagao , Shen, Zhen
- Language: English
- Type: Article
- Identifier: vital:7241 , http://hdl.handle.net/10962/d1020245
- Description: Recent developments in organosilicon-based chemosensors for F− recognition are reviewed. The design strategies for improving the photophysical properties of organosilicon-based chemosensors are elaborated, with an emphasis placed on their utility for biological applications. The photophysical properties and electronic structures are analyzed in depth with reference made to the results of molecular modeling calculation and possible future research directions are assessed. , Original publication is available at http://dx.doi.org/10.1016/j.ccr.2014.10.009
- Full Text: false
- Authors: Gai, Lizhi , Mack, John , Lu, Hua , Nyokong, Tebello , Li, Zhifang , Kobayashi, Nagao , Shen, Zhen
- Language: English
- Type: Article
- Identifier: vital:7241 , http://hdl.handle.net/10962/d1020245
- Description: Recent developments in organosilicon-based chemosensors for F− recognition are reviewed. The design strategies for improving the photophysical properties of organosilicon-based chemosensors are elaborated, with an emphasis placed on their utility for biological applications. The photophysical properties and electronic structures are analyzed in depth with reference made to the results of molecular modeling calculation and possible future research directions are assessed. , Original publication is available at http://dx.doi.org/10.1016/j.ccr.2014.10.009
- Full Text: false
Oriel House
- Subjects: Rhodes University College -- Buildings -- Photographs
- Type: Image
- Identifier: vital:14185 , http://hdl.handle.net/10962/d1018109 , MS 10 542 , CD 55
- Description: Oriel House was the first women's residence and was completed in 1915. It was built to Baker and Kendall's plans.
- Full Text: false
- Subjects: Rhodes University College -- Buildings -- Photographs
- Type: Image
- Identifier: vital:14185 , http://hdl.handle.net/10962/d1018109 , MS 10 542 , CD 55
- Description: Oriel House was the first women's residence and was completed in 1915. It was built to Baker and Kendall's plans.
- Full Text: false
Original jazz music
- Unknown
- Authors: Unknown
- Subjects: McGregor, Chris--1936-1990 , Dollar Brand , Jazz at the Playhouse
- Language: English
- Type: Article
- Identifier: vital:13737 , http://hdl.handle.net/10962/d1012751
- Description: Photocopied article from the South African newspaper The Star about Chris McGregor rehearsing for the concert Jazz at the Playhouse. There is a picture with this article of Chris McGregor (left) talking to 4 other persons.
- Full Text:
- Authors: Unknown
- Subjects: McGregor, Chris--1936-1990 , Dollar Brand , Jazz at the Playhouse
- Language: English
- Type: Article
- Identifier: vital:13737 , http://hdl.handle.net/10962/d1012751
- Description: Photocopied article from the South African newspaper The Star about Chris McGregor rehearsing for the concert Jazz at the Playhouse. There is a picture with this article of Chris McGregor (left) talking to 4 other persons.
- Full Text:
Ostrich camp
- Subjects: (South Africa) -- History -- Photographs
- Type: Image
- Identifier: http://hdl.handle.net/10962/21485 , vital:22941 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/A 2719_73
- Description: Album of "Photographs of South Africa", compiler and photographer not stated. Photos covering Easter and Western Cape, Natal, Free State, Rivers, Transport, Ostriches and Black people. [1880-1883] , Gold Fields of South Africa Ltd. (donor)
- Full Text: false
- Subjects: (South Africa) -- History -- Photographs
- Type: Image
- Identifier: http://hdl.handle.net/10962/21485 , vital:22941 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/A 2719_73
- Description: Album of "Photographs of South Africa", compiler and photographer not stated. Photos covering Easter and Western Cape, Natal, Free State, Rivers, Transport, Ostriches and Black people. [1880-1883] , Gold Fields of South Africa Ltd. (donor)
- Full Text: false
Our party says Fitzem front right
- Subjects: FitzSimons, Vivian F.M. (Vivian Frederick M.) 1901-1975
- Type: still image
- Identifier: http://hdl.handle.net/10962/48317 , vital:25785 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 6133
- Description: Photograph of women and men sitting in front of the house
- Full Text: false
- Subjects: FitzSimons, Vivian F.M. (Vivian Frederick M.) 1901-1975
- Type: still image
- Identifier: http://hdl.handle.net/10962/48317 , vital:25785 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 6133
- Description: Photograph of women and men sitting in front of the house
- Full Text: false
Outcomes and Risk Factors Associated with Drug Resistant Tuberculosis in Rural Eastern Cape, South Africa.pdf
- Identifier: http://hdl.handle.net/11260/5058 , vital:44312
- Full Text:
- Identifier: http://hdl.handle.net/11260/5058 , vital:44312
- Full Text: