Preparation, chemical composition, characterization, and properties of Napier grass paper sheets
- Reddy, K. Obi, Maheswari, C. Uma, Shukla, M., Muzenda, Edison
- Authors: Reddy, K. Obi , Maheswari, C. Uma , Shukla, M. , Muzenda, Edison
- Date: 2014
- Subjects: Pulp and papermaking , Napier Grass fibers
- Type: Article
- Identifier: uj:4767 , ISSN 1520-5754 , http://hdl.handle.net/10210/11942
- Description: In this study, perennial fast growth Napier grass fibers were used for pulp and papermaking. Chlorination and alkaline processes were carried out using sodium chlorite and sodium hydroxide respectively, for pulp extraction from Napier grass. Detailed chemical composition analysis of the Napier grass fibers and the extracted pulp was carried out and a comparison with other perennial grasses was made. The extracted fibers and pulp obtained from Napier grass were characterized using scanning electron microscopy and Fourier transform infrared spectroscopy. The physical, optical, and mechanical properties of Napier grass pulp handmade paper sheets produced in the laboratory were investigated by finding the opacity, brightness, tensile index, breaking length, and burst index. Handmade paper sheets made from Napier grass pulp were compared to paper made from other perennial grasses. The superior properties of paper produced from Napier grass pulp indicate the suitability of Napier grass as an alternative non-wood source for papermaking.
- Full Text:
- Authors: Reddy, K. Obi , Maheswari, C. Uma , Shukla, M. , Muzenda, Edison
- Date: 2014
- Subjects: Pulp and papermaking , Napier Grass fibers
- Type: Article
- Identifier: uj:4767 , ISSN 1520-5754 , http://hdl.handle.net/10210/11942
- Description: In this study, perennial fast growth Napier grass fibers were used for pulp and papermaking. Chlorination and alkaline processes were carried out using sodium chlorite and sodium hydroxide respectively, for pulp extraction from Napier grass. Detailed chemical composition analysis of the Napier grass fibers and the extracted pulp was carried out and a comparison with other perennial grasses was made. The extracted fibers and pulp obtained from Napier grass were characterized using scanning electron microscopy and Fourier transform infrared spectroscopy. The physical, optical, and mechanical properties of Napier grass pulp handmade paper sheets produced in the laboratory were investigated by finding the opacity, brightness, tensile index, breaking length, and burst index. Handmade paper sheets made from Napier grass pulp were compared to paper made from other perennial grasses. The superior properties of paper produced from Napier grass pulp indicate the suitability of Napier grass as an alternative non-wood source for papermaking.
- Full Text:
Close-up Sophiatown : transnational perspectives on past, present and future of an iconic suburb
- Authors: Fink, Katharina
- Date: 2015-02-10
- Subjects: Sophiatown (South Africa) - History
- Type: Article
- Identifier: uj:5586 , ISSN 14692872 , http://hdl.handle.net/10210/14255
- Description: In this article I suggest a different view on Sophiatown’s existence, both in terms of it standing as mythical icon and as a suburb. Instead of continuing the look ‘from afar’ (Hannerz 1994), which positions Sophiatown within the category of desirable ‘global icons’, I turn my gaze deeper into Sophiatown, both as a suburb and an icon. I use the lens of transnationalism to zoom into three scenes in Sophiatown in order to examine what has been ignored and overlooked in previous nar-ratives. Where the global icon stays and focuses on the surface, the transnational perspective focuses on the everyday lives within the icon. Through a series of vignettes, looking at women in Sophiatown’s history, at coffee making with a Greek immigrant, and tales of home with Senegalese businessmen, through a consideration of Bloke Modisane’s post-Sophiatown career, I examine how the time established by focusing on these transnational lives is a time of presence which spans mul-tiple locations. I conclude the article with a final point about the ‘unrepresentability’ of a diverse history in the current ways of narrating history in Sophiatown; and the necessity of extending spaces of representation for other, alternative perspectives.
- Full Text:
- Authors: Fink, Katharina
- Date: 2015-02-10
- Subjects: Sophiatown (South Africa) - History
- Type: Article
- Identifier: uj:5586 , ISSN 14692872 , http://hdl.handle.net/10210/14255
- Description: In this article I suggest a different view on Sophiatown’s existence, both in terms of it standing as mythical icon and as a suburb. Instead of continuing the look ‘from afar’ (Hannerz 1994), which positions Sophiatown within the category of desirable ‘global icons’, I turn my gaze deeper into Sophiatown, both as a suburb and an icon. I use the lens of transnationalism to zoom into three scenes in Sophiatown in order to examine what has been ignored and overlooked in previous nar-ratives. Where the global icon stays and focuses on the surface, the transnational perspective focuses on the everyday lives within the icon. Through a series of vignettes, looking at women in Sophiatown’s history, at coffee making with a Greek immigrant, and tales of home with Senegalese businessmen, through a consideration of Bloke Modisane’s post-Sophiatown career, I examine how the time established by focusing on these transnational lives is a time of presence which spans mul-tiple locations. I conclude the article with a final point about the ‘unrepresentability’ of a diverse history in the current ways of narrating history in Sophiatown; and the necessity of extending spaces of representation for other, alternative perspectives.
- Full Text:
Destructive creation : capital accumulation and the structural violence of tourism
- Büscher, Bram, Fletcher, Robert
- Authors: Büscher, Bram , Fletcher, Robert
- Date: 2016
- Subjects: Tourism , Capital , Value
- Language: English
- Type: Articles
- Identifier: http://hdl.handle.net/10210/241853 , uj:24932 , Citation: Bram Büscher & Robert Fletcher (2017) Destructive creation: capital accumulation and the structural violence of tourism, Journal of Sustainable Tourism, 25:5, 651-667, DOI: 10.1080/09669582.2016.1159214 , ISSN: 0966-9582
- Description: Abstract: Tourism is not merely a capitalist practice but a central practice through which capitalism sustains itself. Precisely how tourism “products” become capital and the types of violence this process entails, however, has not yet been systematically theorized or investigated. Building on Noel Castree’s six principles of commodification, we explore how tourism becomes capital, understood as “value in motion”, and how this process not only provokes various forms of material violence but can become a form of (structural) violence in its own right. Based on research in tourism settings in Southern Africa and Latin America and general trends in international tourism, we argue that three integrated forms of structural violence to both humans and non-human natures are especially prominent, namely the systematic production of inequalities, waste and “spaces of exception”. As a global industry crucially dependent on integrated material and discursive forms of value creation, we also show that these forms of structural violence are often rendered invisible through branding. We conclude that tourism uniquely combines these three forms of structural violence to enable a move from Schumpeter’s famous creative destruction to “destructive creation” as a key form of violence under capitalism.
- Full Text:
- Authors: Büscher, Bram , Fletcher, Robert
- Date: 2016
- Subjects: Tourism , Capital , Value
- Language: English
- Type: Articles
- Identifier: http://hdl.handle.net/10210/241853 , uj:24932 , Citation: Bram Büscher & Robert Fletcher (2017) Destructive creation: capital accumulation and the structural violence of tourism, Journal of Sustainable Tourism, 25:5, 651-667, DOI: 10.1080/09669582.2016.1159214 , ISSN: 0966-9582
- Description: Abstract: Tourism is not merely a capitalist practice but a central practice through which capitalism sustains itself. Precisely how tourism “products” become capital and the types of violence this process entails, however, has not yet been systematically theorized or investigated. Building on Noel Castree’s six principles of commodification, we explore how tourism becomes capital, understood as “value in motion”, and how this process not only provokes various forms of material violence but can become a form of (structural) violence in its own right. Based on research in tourism settings in Southern Africa and Latin America and general trends in international tourism, we argue that three integrated forms of structural violence to both humans and non-human natures are especially prominent, namely the systematic production of inequalities, waste and “spaces of exception”. As a global industry crucially dependent on integrated material and discursive forms of value creation, we also show that these forms of structural violence are often rendered invisible through branding. We conclude that tourism uniquely combines these three forms of structural violence to enable a move from Schumpeter’s famous creative destruction to “destructive creation” as a key form of violence under capitalism.
- Full Text:
Turbulent heat transfer analysis of a three-dimensional array of perforated fins due to changes in perforation sizes
- Jen, T.C, Shaeri, Mohammad Reza, Jen, Tien-Chien
- Authors: Jen, T.C , Shaeri, Mohammad Reza , Jen, Tien-Chien
- Date: 2012
- Subjects: Heat transfer , Perforated fins
- Type: Article
- Identifier: uj:5261 , ISSN 1040-7782 , http://hdl.handle.net/10210/14930
- Description: Turbulent heat transfer characteristics of three-dimensional and rectangular perforated fins, including perforation like channels along the length of the fins, are investigated. Both dimensions and numbers of perforations are changed at the highest porosity in the study of Shaeri and Yaghoubi [7] to determine the effects of perforation sizes on the heat transfer characteristics of the perforated fins. Results show that at a specific porosity, a fin with a higher number of perforations enhances the heat transfer rate more efficiently. Also, total drag is not only remarkably lower in perforated fins compared with a solid fin, but also becomes smaller by decreasing the number of perforations.
- Full Text:
- Authors: Jen, T.C , Shaeri, Mohammad Reza , Jen, Tien-Chien
- Date: 2012
- Subjects: Heat transfer , Perforated fins
- Type: Article
- Identifier: uj:5261 , ISSN 1040-7782 , http://hdl.handle.net/10210/14930
- Description: Turbulent heat transfer characteristics of three-dimensional and rectangular perforated fins, including perforation like channels along the length of the fins, are investigated. Both dimensions and numbers of perforations are changed at the highest porosity in the study of Shaeri and Yaghoubi [7] to determine the effects of perforation sizes on the heat transfer characteristics of the perforated fins. Results show that at a specific porosity, a fin with a higher number of perforations enhances the heat transfer rate more efficiently. Also, total drag is not only remarkably lower in perforated fins compared with a solid fin, but also becomes smaller by decreasing the number of perforations.
- Full Text:
Routes to Sophiatown
- Authors: Erlank, Natasha
- Date: 2015-02-12
- Subjects: Sophiatown (South Africa) - History
- Type: Article
- Identifier: uj:5617 , ISSN 1469-2872 , http://hdl.handle.net/10210/14492
- Description: What is Sophiatown? Is it vibrant black, urbanity, or a more tragic recollection: the suburb that was destroyed by the apartheid state’s forced removals of black South Africans from areas proclaimed white from the 1950s onwards. Both of these representations have considerable contemporary traction. The former lends itself to a very nostalgic view of the suburb, the South African rainbow nation transported into a multi- cultural and co-operative past, while anti -apartheid commemorative initiatives highlight the removals beginning in February 1955. Neither of these representations, though, reflects the entirety of Sophiatown’s histories, including of when it was called Triomf. This article brings together the different histories and representations of Sophiatown, showing their messy connection with one another, through a consideration of two linked sets of ideas: in the first place, space viewed as socially-produced draws attention to the multiply -constructed nature of the landscape known as Sophiatown. In the second, attention to the quotidian accounts which Sophiatown residents produce about their lives reveals the way in which space and place (house and home, daily travel routes) work to overlap the familiar with the unfamiliar. The first set of ideas looks to ideas of space as politically - contingent, the second to the processual role it plays in how people remember their everyday lives.
- Full Text:
- Authors: Erlank, Natasha
- Date: 2015-02-12
- Subjects: Sophiatown (South Africa) - History
- Type: Article
- Identifier: uj:5617 , ISSN 1469-2872 , http://hdl.handle.net/10210/14492
- Description: What is Sophiatown? Is it vibrant black, urbanity, or a more tragic recollection: the suburb that was destroyed by the apartheid state’s forced removals of black South Africans from areas proclaimed white from the 1950s onwards. Both of these representations have considerable contemporary traction. The former lends itself to a very nostalgic view of the suburb, the South African rainbow nation transported into a multi- cultural and co-operative past, while anti -apartheid commemorative initiatives highlight the removals beginning in February 1955. Neither of these representations, though, reflects the entirety of Sophiatown’s histories, including of when it was called Triomf. This article brings together the different histories and representations of Sophiatown, showing their messy connection with one another, through a consideration of two linked sets of ideas: in the first place, space viewed as socially-produced draws attention to the multiply -constructed nature of the landscape known as Sophiatown. In the second, attention to the quotidian accounts which Sophiatown residents produce about their lives reveals the way in which space and place (house and home, daily travel routes) work to overlap the familiar with the unfamiliar. The first set of ideas looks to ideas of space as politically - contingent, the second to the processual role it plays in how people remember their everyday lives.
- Full Text:
Spatial justice and the Western Areas of Johannesburg
- Authors: Chapman, Thomas Patrick
- Date: 2015-02-12
- Subjects: Spatial justice , City planning - South Africa - Johannesburg , Sophiatown (South Africa) - History , Westbury (South Africa) - History
- Type: Article
- Identifier: uj:5564 , ISSN 00020184 , ISSN 14692872 , http://hdl.handle.net/10210/14183
- Description: In Johannesburg, areas like Sophiatown and Westbury, part of the Western Areas, continue to fulfil apartheid intentions 20 years after South Africa’s first democratic elections. I begin this article by describing the layout of Johannesburg. I then go on to frame the more than 100-year history of the Western Areas into five key states of growth and change. Changes to the landscape are presented as urban design ‘actions’ and are analysed in terms of spatial justice theory, both regarding guiding policies and resultant urban forms (such as dividing buffer strips). The stages of growth include the 1904 to 1919 period characterised by the creation of a transport grid for the town; the era 1918 to 1948, as Sophiatown and Western Native Township took shape; the period of high apartheid from 1948 to 1985; and the dismantling of apartheid spatial policies in the post-1985 period. This final section of this article will also include an account of the most recent spatial policy developments in the Western Areas, branded in 2012 as the ‘Corridors of Freedom’.
- Full Text:
- Authors: Chapman, Thomas Patrick
- Date: 2015-02-12
- Subjects: Spatial justice , City planning - South Africa - Johannesburg , Sophiatown (South Africa) - History , Westbury (South Africa) - History
- Type: Article
- Identifier: uj:5564 , ISSN 00020184 , ISSN 14692872 , http://hdl.handle.net/10210/14183
- Description: In Johannesburg, areas like Sophiatown and Westbury, part of the Western Areas, continue to fulfil apartheid intentions 20 years after South Africa’s first democratic elections. I begin this article by describing the layout of Johannesburg. I then go on to frame the more than 100-year history of the Western Areas into five key states of growth and change. Changes to the landscape are presented as urban design ‘actions’ and are analysed in terms of spatial justice theory, both regarding guiding policies and resultant urban forms (such as dividing buffer strips). The stages of growth include the 1904 to 1919 period characterised by the creation of a transport grid for the town; the era 1918 to 1948, as Sophiatown and Western Native Township took shape; the period of high apartheid from 1948 to 1985; and the dismantling of apartheid spatial policies in the post-1985 period. This final section of this article will also include an account of the most recent spatial policy developments in the Western Areas, branded in 2012 as the ‘Corridors of Freedom’.
- Full Text:
En-visioning the dance : the audience as mirror
- Authors: Botha, Catherine F.
- Date: 2015-07-21
- Subjects: Mirror metaphor , Art audience , Dance , Dewey, John. Arts as experience
- Type: Article
- Identifier: uj:5549 , ISSN 2163-7660 , ISSN 1013-7548 , http://hdl.handle.net/10210/14134
- Description: The current article is focused upon an exploration of the question of the nature of the art audience, with a specific emphasis on dance considered as a performing art. Five possible kinds of perceiver involved in the reception of dance as an art are discussed in order to demonstrate that the much criticized metaphor of the mirror can indeed function as a fruitful means to develop an understanding of how dance as an art is perceived, specifically if a more nuanced understanding of the mirror metaphor is applied. In its attempt to rehabilitate this metaphor, the paper draws upon and develops selected aspects of the philosophy of art proposed by John Dewey in his often overlooked Art as Experience (1934).
- Full Text:
- Authors: Botha, Catherine F.
- Date: 2015-07-21
- Subjects: Mirror metaphor , Art audience , Dance , Dewey, John. Arts as experience
- Type: Article
- Identifier: uj:5549 , ISSN 2163-7660 , ISSN 1013-7548 , http://hdl.handle.net/10210/14134
- Description: The current article is focused upon an exploration of the question of the nature of the art audience, with a specific emphasis on dance considered as a performing art. Five possible kinds of perceiver involved in the reception of dance as an art are discussed in order to demonstrate that the much criticized metaphor of the mirror can indeed function as a fruitful means to develop an understanding of how dance as an art is perceived, specifically if a more nuanced understanding of the mirror metaphor is applied. In its attempt to rehabilitate this metaphor, the paper draws upon and develops selected aspects of the philosophy of art proposed by John Dewey in his often overlooked Art as Experience (1934).
- Full Text:
Tensile and thermal properties of poly(lactic acid)/eggshell powder composite films
- Ashok, B., Naresh, S., Reddy, K. Obi, Madhukar, K., Cai, J., Zhang, L., Rajulu, A. Varada
- Authors: Ashok, B. , Naresh, S. , Reddy, K. Obi , Madhukar, K. , Cai, J. , Zhang, L. , Rajulu, A. Varada
- Date: 2014
- Subjects: Eggshell powder , Poly(lactic acid) , Tensile properties , Thermal stability , X-ray diffraction , Biodegradable composite films
- Type: Article
- Identifier: uj:4813 , ISSN 1563-5341 , http://hdl.handle.net/10210/12254
- Description: Biodegradable composite films of poly(lactic acid) (PLA)=eggshell powder (ESP) were prepared by the composite film casting method using chloroform as the solvent. ESP was loaded in PLA in 1 to 5 wt.%. The films were subjected to tensile, FT-IR spectral, thermogravimetric, X-ray, and microscopic analyses. The tensile strength and modulus of the composite films were found to be higher than those of PLA and increased with ESP content up to 4 wt.% and then decreased. A reverse trend was observed in the case of percentage elongation at break. The X-ray diffractograms of the composite films indicated an increase in crystallinity with ESP content. The optical micrographs indicated uniform distribution of ESP particles in the composite films. However, the fractographs indicated agglomeration of ESP particles at 5 wt.% loading. The FT-IR spectra revealed no specific interactions between PLA and ESP. The thermal stability of the composite films increased with ESP content.
- Full Text:
- Authors: Ashok, B. , Naresh, S. , Reddy, K. Obi , Madhukar, K. , Cai, J. , Zhang, L. , Rajulu, A. Varada
- Date: 2014
- Subjects: Eggshell powder , Poly(lactic acid) , Tensile properties , Thermal stability , X-ray diffraction , Biodegradable composite films
- Type: Article
- Identifier: uj:4813 , ISSN 1563-5341 , http://hdl.handle.net/10210/12254
- Description: Biodegradable composite films of poly(lactic acid) (PLA)=eggshell powder (ESP) were prepared by the composite film casting method using chloroform as the solvent. ESP was loaded in PLA in 1 to 5 wt.%. The films were subjected to tensile, FT-IR spectral, thermogravimetric, X-ray, and microscopic analyses. The tensile strength and modulus of the composite films were found to be higher than those of PLA and increased with ESP content up to 4 wt.% and then decreased. A reverse trend was observed in the case of percentage elongation at break. The X-ray diffractograms of the composite films indicated an increase in crystallinity with ESP content. The optical micrographs indicated uniform distribution of ESP particles in the composite films. However, the fractographs indicated agglomeration of ESP particles at 5 wt.% loading. The FT-IR spectra revealed no specific interactions between PLA and ESP. The thermal stability of the composite films increased with ESP content.
- Full Text:
Of Faustian pacts and mega-projects : the politics and economics of the port expansion in the South Basin of Durban, South Africa
- Authors: Desai, Ashwin
- Date: 2015-01-19
- Subjects: Harbors - Political aspects - South Africa - Durban , Harbors - Economic aspects - South Africa - Durban
- Type: Article
- Identifier: uj:5599 , ISSN 10455752 , http://hdl.handle.net/10210/14312
- Description: Please refer to full text to view abstract
- Full Text:
- Authors: Desai, Ashwin
- Date: 2015-01-19
- Subjects: Harbors - Political aspects - South Africa - Durban , Harbors - Economic aspects - South Africa - Durban
- Type: Article
- Identifier: uj:5599 , ISSN 10455752 , http://hdl.handle.net/10210/14312
- Description: Please refer to full text to view abstract
- Full Text:
Effective borehole thermal resistance of a single u-tube ground heat exchanger
- Liao, Quan, Zhou, Chao, Cui, Wenzhi, Jen, Tien-Chien
- Authors: Liao, Quan , Zhou, Chao , Cui, Wenzhi , Jen, Tien-Chien
- Date: 2012
- Subjects: Ground-source heat pumps
- Type: Article
- Identifier: uj:5271 , ISSN 1040-7782 , http://hdl.handle.net/10210/14940
- Description: A ground-source heat pump (GSHP) uses the earth as a heat source or heat sink to extract or reject the thermal energy. Since the annual temperature fluctuation of soil under the ground is relatively small, the GSHP system has been recognized as one of the most energy-efficient systems for space heating and cooling in residential and commercial buildings. In a GSHP system, one of the most important components is the ground-coupled heat exchanger, through which thermal energy is exchanged between heat carrier fluid (i.e., water or water-antifreeze fluid) and soil. Since the ground heat exchanger is responsible for a major portion of the initial cost of the GSHP system, and the efficiency of this system depends on the performance of a ground heat exchanger, careful design of the ground heat exchanger is crucial for successful application of the GSHP system [1].
- Full Text:
- Authors: Liao, Quan , Zhou, Chao , Cui, Wenzhi , Jen, Tien-Chien
- Date: 2012
- Subjects: Ground-source heat pumps
- Type: Article
- Identifier: uj:5271 , ISSN 1040-7782 , http://hdl.handle.net/10210/14940
- Description: A ground-source heat pump (GSHP) uses the earth as a heat source or heat sink to extract or reject the thermal energy. Since the annual temperature fluctuation of soil under the ground is relatively small, the GSHP system has been recognized as one of the most energy-efficient systems for space heating and cooling in residential and commercial buildings. In a GSHP system, one of the most important components is the ground-coupled heat exchanger, through which thermal energy is exchanged between heat carrier fluid (i.e., water or water-antifreeze fluid) and soil. Since the ground heat exchanger is responsible for a major portion of the initial cost of the GSHP system, and the efficiency of this system depends on the performance of a ground heat exchanger, careful design of the ground heat exchanger is crucial for successful application of the GSHP system [1].
- Full Text:
Time and angle of arrival statistics of mobile-tomobile communication channel employing dual annular strip model
- Bhattacharjee, Ratnajit, Paul, B.S.
- Authors: Bhattacharjee, Ratnajit , Paul, B.S.
- Date: 2010
- Subjects: Mobile-to-mobile channel , Channel modeling , Angle of arrival
- Language: English
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/386118 , http://hdl.handle.net/10210/17967 , uj:15944 , ISSN: 0377-2063 , Paul, B.S. & Bhattacharjee, R. 2010. Time and angle of arrival statistics of mobile-to-mobile communication channel employing dual annular strip model. IETE Journal of Research (Nov–Dec).
- Description: Abstract: In this paper, a generalized channel model for mobile-to-mobile communication based on the single bounce geometrybased channel modeling techniques has been proposed and analyzed. The model assumes the scatterers to be present in annular strips around the transmitting and the receiving mobile stations. Time of arrival and angle of arrival statistics, being two important channel parameters, have been derived and verified through computer simulations.
- Full Text:
- Authors: Bhattacharjee, Ratnajit , Paul, B.S.
- Date: 2010
- Subjects: Mobile-to-mobile channel , Channel modeling , Angle of arrival
- Language: English
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/386118 , http://hdl.handle.net/10210/17967 , uj:15944 , ISSN: 0377-2063 , Paul, B.S. & Bhattacharjee, R. 2010. Time and angle of arrival statistics of mobile-to-mobile communication channel employing dual annular strip model. IETE Journal of Research (Nov–Dec).
- Description: Abstract: In this paper, a generalized channel model for mobile-to-mobile communication based on the single bounce geometrybased channel modeling techniques has been proposed and analyzed. The model assumes the scatterers to be present in annular strips around the transmitting and the receiving mobile stations. Time of arrival and angle of arrival statistics, being two important channel parameters, have been derived and verified through computer simulations.
- Full Text:
Bifurcation and hysteresis of flow pattern transition in a shallow molten silicon pool with Cz configuration
- Peng, Lan, Li, You-Rong, Liu, Ying-Jie, Imaishi, Nobuyuki, Jen, Tien-Chien, Chen, Qing-hua
- Authors: Peng, Lan , Li, You-Rong , Liu, Ying-Jie , Imaishi, Nobuyuki , Jen, Tien-Chien , Chen, Qing-hua
- Date: 2007
- Subjects: Bifurcation , Hysteresis , Flow pattern transition
- Type: Article
- Identifier: uj:5272 , ISSN 1040-7782 , http://hdl.handle.net/10210/14941
- Description: Please refer to full text to view abstract
- Full Text:
- Authors: Peng, Lan , Li, You-Rong , Liu, Ying-Jie , Imaishi, Nobuyuki , Jen, Tien-Chien , Chen, Qing-hua
- Date: 2007
- Subjects: Bifurcation , Hysteresis , Flow pattern transition
- Type: Article
- Identifier: uj:5272 , ISSN 1040-7782 , http://hdl.handle.net/10210/14941
- Description: Please refer to full text to view abstract
- Full Text:
“What would they do if you greeted?” The potentiality of greetings in the new South Africa
- Authors: Morgan, Karie L.
- Date: 2015-01-29
- Subjects: Social change - South Africa
- Type: Article
- Identifier: uj:5565 , ISSN 00020184 , http://hdl.handle.net/10210/14184
- Description: Please refer to full text to view abstract
- Full Text:
- Authors: Morgan, Karie L.
- Date: 2015-01-29
- Subjects: Social change - South Africa
- Type: Article
- Identifier: uj:5565 , ISSN 00020184 , http://hdl.handle.net/10210/14184
- Description: Please refer to full text to view abstract
- Full Text:
Five funerals, no weddings, a couple of birthdays : Terry Ranger, his contemporaries, and the end of Zimbabwean nationalism – 24 October 2013–3 January 2015
- Authors: Moore, David
- Date: 2015-04-15
- Subjects: Nationalism - Zimbabwe , Zimbabwe - Politics and government , Ranger, T.O.
- Type: Article
- Identifier: uj:5600 , ISSN 17401720 , http://hdl.handle.net/10210/14330
- Description: Please refer to full text to view abstract
- Full Text:
- Authors: Moore, David
- Date: 2015-04-15
- Subjects: Nationalism - Zimbabwe , Zimbabwe - Politics and government , Ranger, T.O.
- Type: Article
- Identifier: uj:5600 , ISSN 17401720 , http://hdl.handle.net/10210/14330
- Description: Please refer to full text to view abstract
- Full Text:
Numerical simulation of fluid flow and heat transfer in a curved square duct by using the Lattice Boltzmann method
- Authors: Liao, Quan , Jen, T.-C.
- Date: 2008
- Subjects: Fluid flow , Heat transfer
- Type: Article
- Identifier: uj:5274 , ISSN 1040-7782 , http://hdl.handle.net/10210/14943
- Description: The study of viscous flow in curved ducts is of fundamental interest in fluid mechanics due to the numerous applications such as flows through turbomachinery blade passages, aircraft intakes, diffusers, heat exchangers, and so on [1–6]. The major effect of curved ducts on the fluid flow involves the strong secondary flow due to the longitudinal curvature in the geometry [7–9]. The presence of longitudinal curvature generates centrifugal force (which is perpendicular to the main flow along the axis) and produces so-called secondary flow on the cross sections of ducts.
- Full Text:
- Authors: Liao, Quan , Jen, T.-C.
- Date: 2008
- Subjects: Fluid flow , Heat transfer
- Type: Article
- Identifier: uj:5274 , ISSN 1040-7782 , http://hdl.handle.net/10210/14943
- Description: The study of viscous flow in curved ducts is of fundamental interest in fluid mechanics due to the numerous applications such as flows through turbomachinery blade passages, aircraft intakes, diffusers, heat exchangers, and so on [1–6]. The major effect of curved ducts on the fluid flow involves the strong secondary flow due to the longitudinal curvature in the geometry [7–9]. The presence of longitudinal curvature generates centrifugal force (which is perpendicular to the main flow along the axis) and produces so-called secondary flow on the cross sections of ducts.
- Full Text:
Family biography, fertility and memory-making in an AIDS-affected South African site
- Authors: Naidoo, Kammila
- Date: 2014-11-21
- Subjects: Family biography , Life history , AIDS (Disease)
- Type: Article
- Identifier: uj:5605 , ISSN 1081602x , http://hdl.handle.net/10210/14336
- Description: Please refer to full text to view abstract
- Full Text: false
- Authors: Naidoo, Kammila
- Date: 2014-11-21
- Subjects: Family biography , Life history , AIDS (Disease)
- Type: Article
- Identifier: uj:5605 , ISSN 1081602x , http://hdl.handle.net/10210/14336
- Description: Please refer to full text to view abstract
- Full Text: false
Numerical simulation of solute redistribution during transient liquid phase bonding processing for Al-Cu alloy"
- Jiao, Y., Jen, Tien-Chien, Jiao, Yuning
- Authors: Jiao, Y. , Jen, Tien-Chien , Jiao, Yuning
- Date: 2011
- Subjects: Numerical simulation , Solute redistribution , Transient liquid phase , Aluminum alloys , Copper alloys
- Type: Article
- Identifier: uj:5246 , ISSN 1040-7782 , http://hdl.handle.net/10210/14852
- Description: A one-dimensional mathematical model is developed to predict the solute redistribution during the transient liquid phase (TLP) bonding process for Al-Cu alloy. The macroscopic solute diffusion in the liquid and the solid as well as for the solid transformation to the liquid because of the solute macrosegregation are considered in this study. The effects of holding temperatures and the interlayer thickness on the holding time, remelting layer thickness, and the mush zone thickness of the TLP bonding process are investigated. It is shown numerically that the holding time, the holding temperature, and the interlayer thickness influence the solute distribution strongly, which in turn influence the mush zone thickness significantly.
- Full Text:
- Authors: Jiao, Y. , Jen, Tien-Chien , Jiao, Yuning
- Date: 2011
- Subjects: Numerical simulation , Solute redistribution , Transient liquid phase , Aluminum alloys , Copper alloys
- Type: Article
- Identifier: uj:5246 , ISSN 1040-7782 , http://hdl.handle.net/10210/14852
- Description: A one-dimensional mathematical model is developed to predict the solute redistribution during the transient liquid phase (TLP) bonding process for Al-Cu alloy. The macroscopic solute diffusion in the liquid and the solid as well as for the solid transformation to the liquid because of the solute macrosegregation are considered in this study. The effects of holding temperatures and the interlayer thickness on the holding time, remelting layer thickness, and the mush zone thickness of the TLP bonding process are investigated. It is shown numerically that the holding time, the holding temperature, and the interlayer thickness influence the solute distribution strongly, which in turn influence the mush zone thickness significantly.
- Full Text:
Regioselective synthesis of 1,5-disubstituted 1,2,3-triazoles by reusable AlCl₃ immobilized on ϒ-Aɭ₂O₃
- Nanjundaswamy, Hemmaragala M., Abrahamse, Heidi
- Authors: Nanjundaswamy, Hemmaragala M. , Abrahamse, Heidi
- Date: 2015
- Subjects: Triazoles
- Language: English
- Type: Journal article
- Identifier: http://hdl.handle.net/10210/57017 , uj:16366 , ISSN: 0039-7911 (Print) , ISSN: 1532-2432 (Online) , Citation: Nanjundaswamy, H.M. & Abrahamse, H. 2015. Regioselective synthesis of 1,5-disubstituted 1,2,3-triazoles by reusable AlCl₃ immobilized on ϒ-Aɭ₂O₃. Synthetic Communications : An International Journal for Rapid Communication of Synthetic Organic Chemistry, 45(8):967-974. DOI:10.1080/00397911.2014.997366
- Description: Abstract: There is rapidly growing interest in the synthesis and use of substituted 1,2,3- triazoles. We report an easy and interesting procedure that demonstrates the effectiveness of surface-modified c-Al2O3, which is reusable, efficient, catalytic, safe, and environmentally acceptable for the regioselective synthesis of 1,5-disubstituted-1,2,3- triazoles via [3þ2] cycloaddition of phenyl and benzyl azides with a series of aryl nitroolefins in good yields. No adverse effect on substituents such as nitro, cyano, hydroxy, ether linkage, and halogens was observed. The catalyst could easily be recycled and was reused for nine runs without losing its activity.
- Full Text:
- Authors: Nanjundaswamy, Hemmaragala M. , Abrahamse, Heidi
- Date: 2015
- Subjects: Triazoles
- Language: English
- Type: Journal article
- Identifier: http://hdl.handle.net/10210/57017 , uj:16366 , ISSN: 0039-7911 (Print) , ISSN: 1532-2432 (Online) , Citation: Nanjundaswamy, H.M. & Abrahamse, H. 2015. Regioselective synthesis of 1,5-disubstituted 1,2,3-triazoles by reusable AlCl₃ immobilized on ϒ-Aɭ₂O₃. Synthetic Communications : An International Journal for Rapid Communication of Synthetic Organic Chemistry, 45(8):967-974. DOI:10.1080/00397911.2014.997366
- Description: Abstract: There is rapidly growing interest in the synthesis and use of substituted 1,2,3- triazoles. We report an easy and interesting procedure that demonstrates the effectiveness of surface-modified c-Al2O3, which is reusable, efficient, catalytic, safe, and environmentally acceptable for the regioselective synthesis of 1,5-disubstituted-1,2,3- triazoles via [3þ2] cycloaddition of phenyl and benzyl azides with a series of aryl nitroolefins in good yields. No adverse effect on substituents such as nitro, cyano, hydroxy, ether linkage, and halogens was observed. The catalyst could easily be recycled and was reused for nine runs without losing its activity.
- Full Text:
Sophiatown
- Erlank, Natasha, Morgan, Karie L.
- Authors: Erlank, Natasha , Morgan, Karie L.
- Date: 2015-02-13
- Subjects: Sophiatown (South Africa) - History
- Type: Article
- Identifier: uj:5585 , ISSN 14692872 , http://hdl.handle.net/10210/14254
- Description: Please refer to full text to view abstract
- Full Text:
- Authors: Erlank, Natasha , Morgan, Karie L.
- Date: 2015-02-13
- Subjects: Sophiatown (South Africa) - History
- Type: Article
- Identifier: uj:5585 , ISSN 14692872 , http://hdl.handle.net/10210/14254
- Description: Please refer to full text to view abstract
- Full Text:
“Wondrous texture” : Henry James's brocades
- Authors: Scherzinger, Karen
- Date: 2015-06-24
- Subjects: Brocade - History - 19th century , James, Henry, 1843-1916
- Type: Article
- Identifier: uj:5568 , ISSN 17535382 , http://hdl.handle.net/10210/14191
- Description: This essay begins with a brief history of the cultural status of brocade in the nineteenth century and then offers a critical account of the ways in which brocade features in Henry James’s work. James’s association of brocade with the aristocracy and the metropole, and his treatment of it as both an embodied object and a metaphor, reveals the textile to be a significant index of a number of his abiding concerns. The essay concludes with a consideration of how brocade both supports and contradicts poststructuralist positions about the referentiality of things in James’s writing, as well as of how brocade provides a fitting analogy for his later style.
- Full Text:
- Authors: Scherzinger, Karen
- Date: 2015-06-24
- Subjects: Brocade - History - 19th century , James, Henry, 1843-1916
- Type: Article
- Identifier: uj:5568 , ISSN 17535382 , http://hdl.handle.net/10210/14191
- Description: This essay begins with a brief history of the cultural status of brocade in the nineteenth century and then offers a critical account of the ways in which brocade features in Henry James’s work. James’s association of brocade with the aristocracy and the metropole, and his treatment of it as both an embodied object and a metaphor, reveals the textile to be a significant index of a number of his abiding concerns. The essay concludes with a consideration of how brocade both supports and contradicts poststructuralist positions about the referentiality of things in James’s writing, as well as of how brocade provides a fitting analogy for his later style.
- Full Text: