Mthatha Research and Innovation Day: programme
- Authors: Walter Sisulu University
- Date: 2021-08-15
- Subjects: Mthatha Research and Innovation Day
- Language: English
- Type: lecture , text
- Identifier: http://hdl.handle.net/11260/6267 , vital:45361
- Description: Mthatha Research and Innovation Day. Topic The Impact of the pandemic in Higher Education and Research: Challenges and possibilities.
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- Date Issued: 2021-08-15
F-and F+-band radioluminescence and the influence of annealing on its emission spectra in Al2O3: C, Mg:
- Authors: Chithambo, Makaiko L , Kalita, Jitumani M , Finch, A A
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/150130 , vital:38942 , https://doi.org/10.1016/j.radmeas.2020.106306
- Description: Radioluminescence spectra of Al2O3:C,Mg monitored at temperatures up to 400 °C is reported. Measurements were made on samples either as received or on ones annealed at 1200 °C. Radioluminescence is observed at 410 nm for the unannealed sample but principally at 330 and 410 nm in the annealed sample with the emission at 330 nm dominant. Both bands are subject to thermal quenching but the change for the F+ band is atypical. Temperature induced effects on these and other bands are discussed, as are complementary measurements of thermoluminescence spectra.
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- Date Issued: 2020
Preferences of resettled refugees on pictograms describing common symptoms of illness:
- Authors: Bellamy, Kim , Dowse, Roslind , Ostini, Remo , Martini, Nataly , Kairuz, Therese
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/${Handle} , vital:40086 , https://0-doi.org.wam.seals.ac.za/10.1007/s10903-019-00908-3
- Description: Illustrated health resources are useful for people who have limited English linguistic ability. The aim was to compare the preferences of resettled refugees from Africa and non-African countries, on pictograms describing common symptoms of illness. Data were collected in two cities in Queensland, Australia. Participants indicated their preference for three types of pictograms depicting seven symptoms. Pictogram sources included the International Pharmaceutical Federation, royaltyfree stock images, and pictograms designed in South Africa.
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- Date Issued: 2020
[Post] Colonial Histories: Trauma, Memory and Reconciliation in the Context of the Angolan Civil War
- Authors: Baines, Gary F
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125752 , vital:35814 , https://doi.10.1080/03612759.2019.1587342
- Description: In 2007, a former South African Defence Force (SADF) paratrooper, Marius van Niekerk, embarked on a journey to confront his shameful memories relating to his role in the Angolan Civil War. From Sweden (where he had gone into exile), Van Niekerk returned to Angola, where he had been deployed during the mid-1980s, and recruited three other veterans of the war to join his party: Patrick Johannes, who had been coerced to fight for the Popular Armed Forces for the Liberation of Angola (FAPLA); Samuel Machado Amaru, who was forcefully enlisted by the National Union for the Total Independence of Angola (UNITA); and Mario Mahonga, who had fought for the Portuguese colonial army before he was recruited by the SADF to fight against the Popular Movement for the Liberation of Angola (MPLA) regime. Van Niekerk had been conscripted at the age of seventeen, and the others had been coerced into their respective militias at more tender ages. It is not clear how the three Angolans were induced to participate in the project, whose objectives they evidently did not share.
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- Date Issued: 2019
Exhibition review: Site of memory: Berni Searle’s-aplace-in-the-sun
- Authors: Muvhuti, Barnabas , Zhang, Lifang
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146937 , vital:38578 , https://artthrob.co.za/2019/07/31/site-of-memory-berni-searles-a-place-in-the-sun/
- Description: Commissioned by the National Arts Festival, Berni Searle created a four-screen multi-channel video installation, A Place in the Sun, which cooperated perfectly with the four wall compartments of the rotunda-shaped Gallery in the Round in the basement of the 1820 Settlers Monument. With the shifting of lights, the video symbolically indicates a full day at a drained swimming pool, from morning to sunset until the whole scene turns into ashes and darkness.
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- Date Issued: 2019
Mulling over Art with Andrew Mulenga: Ni Mzilo – it is taboo
- Authors: Mulenga, Andrew
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146793 , vital:38558 , https://www.themastonline.com/2019/05/14/ni-mzilo-it-is-taboo/
- Description: “Ni Mzilo — It is taboo”, the ongoing solo exhibition by Agness Buya Yombwe at the Livingstone National Art Gallery that investigates the subject of Taboos and superstitions, but really anything from environmental concerns to prostate cancer is no secret by now, having been opened alongside the launch of a book also authored by the artist.
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- Date Issued: 2019
Mulling over Art with Andrew Mulenga: Shapley inspirations
- Authors: Mulenga, Andrew
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146893 , vital:38567 , https://www.themastonline.com/2019/11/05/mulling-over-art-shapley-inspirations/
- Description: Sponsored by the Confucius Institute at the University of Zambia (UNZA), the guiding idea of the exhibition “2019 Confucius Institute Art Exhibition and Open Day” at the Lusaka National Museum was a simple one, to celebrate the friendship of Zambia and China.
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- Date Issued: 2019
Mulling over Art with Andrew Mulenga: Wadada’s paintings: vehicles for peace
- Authors: Mulenga, Andrew
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146854 , vital:38564 , https://www.themastonline.com/2019/10/23/mulling-over-art-2/
- Description: ART can be argued to possess a visual agency that gives it the ability to sway popular mindsets or aid peacebuilding and help mediate social healing. It can help bring together aggressively opposing political parties by encouraging nonviolent politicking. In short, art is a vehicle for peace.
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- Date Issued: 2019
Mulling over Art with Andrew Mulenga: ZAOU releases 6th stream of Fine Art Students
- Authors: Mulenga, Andrew
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146882 , vital:38566 , https://www.themastonline.com/2019/12/31/mulling-over-art-zaou-releases-6th-stream-of-fine-art-students/
- Description: Friday the 13th of December marked the last day of a four-year academic journey for 14 Bachelor of Fine Arts students at the Zambian Open University. Held at the Lusaka National Museum, it culminated in what is now called the Fourth Year Undergraduate Fine Arts Expo, an annual event.
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- Date Issued: 2019
Plaxenone A and B: Cytotoxic halogenated monoterpenes from the South African red seaweed Plocamium maxillosum
- Authors: Knott, Michael G , de la Mare, Jo-Anne , Edkins, Adrienne L , Zhang, Angel , Stillman, Martin J , Bolton, John J , Antunes, Edith M , Beukes, Denzil R
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/164446 , vital:41119 , https://doi.org/10.1016/j.phytol.2018.12.009
- Description: The endemic South African red seaweed Plocamium maxillosum (Poiret) Lamouroux produces two unusual isomeric dichlorinated cyclohexenone monoterpenes, plaxenone A and B (1 and 2). The structures of the isolated compounds were determined from spectroscopic data and their absolute configuration was determined by comparison of the experimental and calculated ECD spectra. Compounds 1 and 2 inhibit the growth of MDA-MB-231 breast cancer cells.
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- Date Issued: 2019
The influence of dopants on thermoluminescence of Sr2MgSi2O7
- Authors: Thomas, Sunil , Kalita, Jitumani M , Chithambo, Makaiko L , Ntwaeaborwa, Odireleng M
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/105148 , vital:32469 , https://doi.org/10.1016/j.jlumin.2018.12.035
- Description: We report the influence of dopants on the thermoluminescence of Sr2MgSi2O7. Samples studied comprise undoped Sr2MgSi2O7 and doped versions, namely, Sr2MgSi2O7:Dy3+, Sr2MgSi2O7:Eu3+, Sr2MgSi2O7:Tb3+ and Sr2MgSi2O7:Tb3+,Eu3+ phosphors. All samples show a broad glow peak near 60 °C when measured at 1 °C/s after irradiation to 10 Gy. The peak changes with partial heating, irradiation and fades between irradiation and measurement in a manner expected of a composite one. The behaviour is used to exemplify the analysis of a composite peak on the basis that particular features reflect those of the dominant component.
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- Date Issued: 2019
Photoluminescence and thermoluminescence properties of BaGa2O4
- Authors: Noto, L L , Poelman, D , Orante-Barrón, V R , Swart, H C , Mathevula, Langutani E , Nyenge, R , Chithambo, Makaiko L , Mothudi, B M , Dhlamini, M S
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/116037 , vital:34292 , https://doi.org/10.1016/j.physb.2017.07.059
- Description: Rare–Earth free luminescent materials are fast becoming important as the cost of rare earth ions gradually increases. In this work, a Rare–Earth free BaGa2O4 luminescent compound was prepared by solid state chemical reaction, which was confirmed to have a single phase by X-ray Diffraction. The Backscattered Electron image and Energy Dispersive X-ray spectroscopy maps confirmed irregular particle and homogeneous compound formation, respectively. The Photoluminescence spectrum displayed broad emission between 350 to 650 nm, which was deconvoluted into two components. The photoluminescence excitation peak was positioned at 254 nm, which corresponds with the band-to-band position observed from the diffuse reflectance spectrum. The band gap was extrapolated to 4.65 ± 0.02 eV using the Kubelka-Munk model. The preliminary thermoluminescence results indicated that the kinetics involved were neither of first nor second order. Additionally, the activation energy of the electrons within the trap centres was approximated to 0.61 ± 0.01 eV using the Initial Rise model.
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- Date Issued: 2018
Silent and Complex Histories: in conversation with Buhlebezwe Siwani
- Authors: Makandula, Sikhumbuzo
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147236 , vital:38607 , https://artthrob.co.za/2018/11/05/silent-and-complex-histories-in-conversation-with-buhlebezwe-siwani/
- Description: A feature by Sikhumbuzo Makandula on the 5th of November 2018
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- Date Issued: 2018
A record of cheetah (Acinonyx jubatus) diet in the Northern Tuli Game Reserve, Botswana
- Authors: Craig, Christie A , Brassine, Eleanor I , Parker, Daniel M
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/123004 , vital:35395 , https://doi.org/10.1111/aje.12374
- Description: Cheetahs (Acinonyx jubatus) typically prey upon the most available small to medium-sized (23–56 kg) antelope (Hayward et al., 2006). In Botswana, impala (Aepyceros melampus) and springbok (Antidorcas marsupialis), followed by steenbok (Raphicerus campestris) and duiker (Sylvicapra grimmia), are the prey species most frequently killed by cheetahs (Klein, 2007). Juvenile eland (Tragelaphus oryx), gemsbok (Oryx gazella), hartebeest (Alcelaphus buselaphus) and kudu (Tragelaphus strepsiceros) are also taken (Klein, 2007). The Northern Tuli Game Reserve (NOTUGRE) in eastern Botswana is naturally delineated by the nonperennial Shashe and Limpopo rivers in the east and south and has relatively porous game fencing along portions of the western and southern boundaries (Fig. 1) (Jackson, McNutt & Apps, 2012). Neither the fences nor the rivers restrict the movement of large carnivores such as cheetahs, lions (Panthera leo), leopards (Panthera pardus), spotted hyaenas (Crocuta crocuta) and African wild dogs (Lycaon pictus) onto neighbouring pastoral land (Jackson, McNutt & Apps, 2012). It is thus possible that cheetahs are feeding on livestock outside of the park. However, the diet of the cheetahs in NOTUGRE has not been evaluated. Our study serves to describe the diet of the cheetahs in NOTUGRE using both scats and kill sightings.
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- Date Issued: 2017
Looking after freedom?:
- Authors: Dantas, Nancy
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147081 , vital:38591 , https://www.buala.org/en/ill-visit/looking-after-freedom
- Description: Did freedom come to South Africa in 1994? Should it be marked and set in time, or is it a fragile process, an ambition and a becoming? Do we see ourselves coming closer to this ideal, or desperately receding from it as an invisible rip current pulls us away? To think of freedom as a given, a day in the year or a landmark on the horizon is to neglect that liberty from bondage and oppression, in all its disastrous and fatidic forms requires vigilance, nurturing and a spirit of insatiable demand. When our freedom becomes commodified, transformed into a mark on annual calendars, a mere commemoration; something we think have obtained and cannot possibly stand to loose, we are all in for trouble.
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- Date Issued: 2017
MD-TASK: a software suite for analyzing molecular dynamics trajectories
- Authors: Brown, David K , Penkler, David L , Amamuddy, Olivier S , Ross, Caroline J , Atilgan, Ali R , Atilgan, Canan , Tastan Bishop, Özlem
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125138 , vital:35735 , https://doi.10.1093/bioinformatics/btx349
- Description: Molecular dynamics (MD) determines the physical motions of atoms of a biological macromolecule in a cell-like environment and is an important method in structural bioinformatics. Traditionally, measurements such as root mean square deviation, root mean square fluctuation, radius of gyration, and various energy measures have been used to analyze MD simulations. Here, we present MD-TASK, a novel software suite that employs graph theory techniques, perturbation response scanning, and dynamic cross-correlation to provide unique ways for analyzing MD trajectories.
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- Date Issued: 2017
Relative features of the principal and secondary luminescence lifetimes in quartz
- Authors: Chithambo, Makaiko L , Ogundare, F O
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125821 , vital:35820 , https://doi.10.1002/pssc.200673721
- Description: Quartz is a common natural mineral with properties that make it amenable for application in radiation dosimetry using luminescence methods [1]. The luminescence properties of quartz including its sensitivity and luminescence lifetimes undergo notable changes when the quartz is annealed, and in particular, near its phase inversion temperatures of 573 and 867 oC [2, 3]. The physical processes leading up to the emission of luminescence in quartz may be investigated using time-resolved optical stimulation. The aim of this method is to separate in time the stimulation and emission of luminescence to enable measurement of time-resolved luminescence spectra which may be resolved into associated lifetimes, defined in this sense as the delay between stimulation and emission of luminescence [4, 5]. A number of such studies show that annealing defines the detailed distribution of lifetimes with measurement temperature as well as the irradiation-dependent characteristics of the lifetimes [3, 6]. In particular, it was noted [3] that spectra measured at certain temperatures could be accurately resolved into more than one component, a scenario that pointed to the possibility of involvement of multiple luminescence centers in the emission of luminescence from quartz. The aim of this work is to build on the findings described, specifically to study the influence of measurement temperature and irradiation on the principal and subsidiary luminescence lifetimes in natural quartz.
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- Date Issued: 2017
Undefined cellulase formulations hinder scientific reproducibility
- Authors: Himmel, Michael E , Abbas, Charles A , Baker, John O , Bayer, Edward A , Bomble, Yannick J , Brunecky, Roman , Chen, Xiaowen , Felby, Claus , Jeoh, Tina , Kumar, Rajeev , McCleary, Barry V , Pletschke, Brett I , Tucker, Melvin P , Wyman, Charles E , Decker, Stephen R
- Date: 2017
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/61402 , vital:28022 , https://doi.org/10.1186/s13068-017-0974-y
- Description: In the shadow of a burgeoning biomass-to-fuels industry, biological conversion of lignocellulose to fermentable sugars in a cost-effective manner is key to the success of second-generation and advanced biofuel production. For the effective comparison of one cellulase preparation to another, cellulase assays are typically carried out with one or more engineered cellulase formulations or natural exoproteomes of known performance serving as positive controls. When these formulations have unknown composition, as is the case with several widely used commercial products, it becomes impossible to compare or reproduce work done today to work done in the future, where, for example, such preparations may not be available. Therefore, being a critical tenet of science publishing, experimental reproducibility is endangered by the continued use of these undisclosed products. We propose the introduction of standard procedures and materials to produce specific and reproducible cellulase formulations. These formulations are to serve as yardsticks to measure improvements and performance of new cellulase formulations.
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- Date Issued: 2017
Employment and diversity in the cultural and creative industries in South Africa: research note
- Authors: Snowball, Jeanette D
- Date: 2016
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/71493 , vital:29858 , https://hdl.handle.net/10520/EJC188591
- Description: The publication of Richard Florida's (2002) The Rise of the Creative Class marked a growing international interest in the creative economy. There are several ways of understanding the creative economy, often divided into the cultural and creative industries. Cultural industries are those whose major outputs have some symbolic value, such as fine arts, film and craft, jewelry design, publishing and fashion. Creative industries are defined more broadly as those that have knowledge as their major input. In addition to cultural goods and services, these include things like software design and internet services. UNESCO (2009) provides guidelines for defining the cultural and creative industries and the ways in which they can be measured, but there is currently no international consensus. Nor is there likely to be, since different countries will have very different levels of involvement and focus that may shape what information is useful, for example, for shaping policy.
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- Date Issued: 2016
On luminescence stimulated from deep traps using thermally-assisted time-resolved optical stimulation in α-Al2O3: C
- Authors: Nyirenda, Angel N , Chithambo, Makaiko L , Polymeris, G S
- Date: 2016
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124627 , vital:35639 , https://doi.org/10.1016/j.radmeas.2016.01.016
- Description: We report a study of charge transfer mechanisms of electrons stimulated optically from very deep traps, also known as donor traps, in α-Al2O3:C. The investigations were carried out using thermally-assisted time-resolved optical stimulation, thermoluminescence and by way of residual thermoluminescence from the main electron trap. When the charges are optically stimulated from the deep traps, they are redistributed via the conduction band to the main electron trap and the shallow trap from where they are optically or thermally released for recombination at luminescence centres. The luminescence is strongly quenched at high measurement temperature as evident by very short luminescence lifetimes at these temperatures. The main peak due to residual thermoluminescence is located at a higher temperature than the conventional main peak.
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- Date Issued: 2016