Showing items 33081 - 33100 of 33211

Your selections:

The nonlinear absorption in new lanthanide double decker pyridine-based phthalocyanines in solution and thin films

- Sekhosana, Kutloano Edward, Nyokong, Tebello

  • Authors: Sekhosana, Kutloano Edward , Nyokong, Tebello
  • Language: English
  • Type: Article
  • Identifier: vital:7299 , http://hdl.handle.net/10962/d1020366
  • Description: The optical behavior of bis-{2(3), 9(10), 16(17), 23(24)-(tetrapyridin-4-yloxy phthalocyaninato)} lanthanum (III) (2) and its ytterbium (3) counterpart in dimethyl sulfoxide are presented and compared to bis-{1(4), 8(11), 15(18), 22(25)-(tetrapyridin-4-yloxy phthalocyaninato)} ytterbium (III) (4). We report on the third-order susceptibility, second-order hyperpolarizability and the limiting threshold values. The nonlinear optical limiting threshold values of complexes 2, 3 and 4 showed improvement in the solid state (thin films), with complex 4 giving the best value at 0.033 J cm−2. , Original publication is available at http://dx.doi.org/10.1016/j.optmat.2015.05.022
  • Full Text: false

The perceptions of educators, in the Queenstown education district, of the labour dispute resolution system

- Rataza, Themba Theophilus

  • Authors: Rataza, Themba Theophilus
  • Subjects: Labor disputes -- South Africa -- Queenstown , Labor laws and legislation -- South Africa
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:9434 , http://hdl.handle.net/10948/d1020542
  • Description: The objective of this study is to conduct a survey concerning the perceptions of educators in the Queenstown education district of the labour dispute resolution system. The education department is one of the biggest departments in the Eastern Cape’s Provincial Administration system. The likelihood of disputes is high when there are many employees. The focus of the study therefore is on how educators perceive the role of the department in terms of ensuring that labour disputes with the department are resolved efficiently and speedily. The advent of a democratic dispensation resulted in the ushering in of progressive labour legislation such as Labour Relations Act 55 of 1995. The objective of this Act is to facilitate economic development, social justice, labour peace and democratization of the workplace. In other words this Act gave birth to the manner in which labour disputes should be resolved. The study was carried out not only to explore the perceptions of educators but also with a view to making recommendations on the findings in order to help contribute towards labour peace and productivity in the workplace. The attitudes of one hundred and forty-one educators were surveyed via questionnaires and six educators who have had labour disputes with the department were interviewed. The key findings of the study revealed that both the educators who were surveyed and those interviewed lack confidence in the effectiveness of the labour dispute procedures in the district; they perceive the system as being inaccessible to them; time taken to resolve disputes is too lengthy; the system lacks necessary independence from the department of education or government and the department is seen as not adhering to its own policies and legislation. Hence there are many disputes and there is a great need for more awareness and for improved training in handling labour dispute resolution systems for district officials and educators. The study recommends more awareness and training sessions for both district officials responsible for labour relations and educators at large. It also calls for an increasingly proactive role by teacher unions in partnership with the department of education to avoid labour disputes. Although the findings cannot be generalized toother districts of the province, they do however highlight critical areas in labour dispute resolution where attention can be paid and focus made in order to ensure labour peace in the workplace for improved productivity and effective teaching and learning.
  • Full Text:

The Photophysical Properties of Multi-Functional Quantum Dots-Magnetic Nanoparticles—Indium Octacarboxyphthalocyanine Nanocomposite

- Tshangana, Charmaine, Nyokong, Tebello

  • Authors: Tshangana, Charmaine , Nyokong, Tebello
  • Language: English
  • Type: Article
  • Identifier: vital:7248 , http://hdl.handle.net/10962/d1020254
  • Description: This work presents the development of a multifunctional hybrid nanoparticle made of L-glutathione capped quantum dots (GSH-CdSe@ZnS), amino functionalized Fe3O4 magnetic nanoparticles and indium octacarboxy phthalocyanine (ClInPc(COOH)8). In this work we investigate the photophysical properties of the individual components and the hybrid nanoparticle, in addition we study the energy transfer (Förster Resonance Energy Transfer (FRET)) in the complex. FRET efficiencies of ~48 % were obtained for energy transfer between the QDs (when alone or linked to MNPs). Both triplet yields and lifetimes of ClInPc(COOH)8 increase in the nanocomposite, with a decrease in fluorescence lifetime. The hybrid nanoparticle showed improved photophysical properties and as a result can be used in photodynamic therapy. , Original publication is available at http://dx.doi.org/10.1007/s10895-014-1497-6
  • Full Text: false

The Plastic University: Knowledge, Disciplines and Decolonial 'Circulations'

- Keet, Andre

  • Authors: Keet, Andre
  • Subjects: Critical pedagogy , Transformative learning , f-sa
  • Language: English
  • Type: text , Lectures
  • Identifier: http://hdl.handle.net/10948/21077 , vital:29436
  • Description: The university is as plastic as the social figure of ‘Mandela’ after whom it is named. It is as plastic as the globe and its humanity in whose name it exists. And, it is as plastic as the human subject that is ‘perpetually called on to reconfigure itself in relation to the artefacts of the age’, as Mbembe2 argues in Critique of Black Reason. The very nature of addressing, of writing … of inaugurating … oneself, through an address is an act of reconfiguration, of responding to an artefact of the university and the professoriate. It is, when all is said and done, a performance, a performative act: declaring so and so a professor of this or that status, authorizing ‘it’ to utter something with some kind of formative force.
  • Full Text:

The relationship between work place well-being, psychological capital and work place trust

- Schoeman, Johannes Dames

  • Authors: Schoeman, Johannes Dames
  • Subjects: Well-being , Trust , Work -- Psychological aspects , Job satisfaction
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: vital:9406 , http://hdl.handle.net/10948/d1013044
  • Description: A study of the available literature on Workplace Well-being, Positive Organisational Capital and Workplace Trust revealed that enormous potential existed for further research. This is a relatively new field with limited literature and research evidence available. It became very clear from the beginning that the relationships between these constructs could successfully be researched. It was therefore decided to embark on an academic research journey in order to contribute to the existing knowledge available on these constructs within the South African business scenario. This quantitative research was used to obtain more clarity about the relationships between the three constructs and to gather the responses from the research population. This research group consisted of 228 managers from the manufacturing operation of a motor vehicle production company and 224 managers from their National Dealership network. The research sample consisted of 452 managers. Three questionnaires were integrated to develop the composite Workplace Wellbeing Questionnaire and consisted of i) Workplace Well-being questionnaire developed by Parker and Hyett (2011), ii) PSYCAP Questionnaire developed by Luthans, Youssef and Avolio (2007), and iii) Workplace Trust Survey developed by Ferres (2001). The managers (n = 452) responded to a 91–item electronic questionnaire. Seven research questions were formulated and covered areas such as: The content, validity and portability of the measuring instruments; The configuration of the various constructs; Relationships between some of the variables; The effect of demographical data on the research variables and; The building of a research model. The content and the structure of the measuring instruments were assessed by means of Confirmatory Factor Analysis (CFA) and Exploratory Factor Analyses (EFA). These assessments showed that the original measuring instruments are not portable to a culture which is different to the one where they were originally developed. The relationships between the variables were determined by: Pearson product moment correlation; Multiple Regression co-efficient; ANOVA and Cohen’s d Test. The relationship between aspects of Workplace Well-being (Job satisfaction) and trust is a significant finding; so are some aspects of PSYCAP (sense of achievement and optimism) and Trust and Well-being. Trust has shown a definite relationship with Work- place well-being. A structural equation model was built to test the relationships between the elements of Workplace Well-being, PSYCAP and Workplace Trust. No satisfactory fit of the model on the data was obtained, although strong correlations between some of the variables existed. The significance of the findings of this study and the contribution that it makes to the existing theory is seen in the importance of the portability of measuring instruments. Recommendations in this regard have been made in Chapter 5. Various findings have also highlighted the relationships between Workplace Well-being, PSYCAP and Work-place Trust. The importance of future research topics has been recommended and a proposal has been made to consider a longitudinal well-being research study.
  • Full Text:

The resilience of African music

- Tracey, Hugh

The reward preference/motivation paradox and implications for performance and education

- Snelgar, Robin

  • Authors: Snelgar, Robin
  • Subjects: Employee motivation , Incentive (Psychology) , f-sa
  • Language: English
  • Type: text , Lectures
  • Identifier: http://hdl.handle.net/10948/21897 , vital:29799
  • Description: The focus on reward preference has emerged essentially as a result of the need to identify what really motivates productive behaviour within the workplace, despite the fact that other variables such as retention and attraction have also been taken into consideratin. Motivation has always been an issue of great interest to both reserachers as well as practitioners within the organizational setting, the intention being to find ways to improve performance and, more specifically, particular types of performance within the world of work. Ultimately, the issue has always been how to understand, predict, shape and control human behaviour.
  • Full Text: false

The role of renewable energy in de-urbanizing post COVID Africa

- Phillips, Russell

  • Authors: Phillips, Russell
  • Subjects: Renewable energy sources -- Africa , Telecommuting -- Africa , f-sa
  • Language: English
  • Type: text , Lectures
  • Identifier: http://hdl.handle.net/10948/52484 , vital:43673
  • Description: The world is becoming increasingly urbanized with more than half of the world population living in cities. In many instances urbanization is seen as a positive phenomenon, however in Africa, urbanization is shown to result in a large proportion of the urban population living in slum conditions. The recent COVID pandemic has necessitated that many persons work remotely and has shown that this arrangement can be both cost effective and efficient. The notion of promoting a remote work concept beyond the pandemic with a view to encouraging de-urbanization is proposed in this research. To achieve meaningful levels of de-urbanization in Africa, particularly in remote, rural areas two major challenges need to be overcome, namely internet connectivity and energy supply. The imminent rollout of Low Earth Orbit Satellites (LEO) for affordable remote connectivity coupled with the maturity of the current solar photovoltaic offerings present seemingly perfect solutions to the identified challenges. Additionally, the record low prices recently reached by Photovoltaic modules and Lithium-ion batteries seem to present fortuitous timing for a mass de-urbanization drive which may have the potential to improve the lives of many people in Africa.
  • Full Text:

The show must go on

- Unknown

The Sisters and the Lion Men

- Tracey, Hugh

  • Authors: Tracey, Hugh
  • Subjects: African story , Three sisters , Disobedience
  • Language: English
  • Type: Sound , Story
  • Identifier: vital:15470 , MOA34-07 , http://hdl.handle.net/10962/d1017826 , MOA34
  • Description: Traditional african story of the three sisters who disobeyed thier mother and what became of them. , This recording is held at the International Library of African Music. For further information contact ilamlibrary@ru.ac.za , This recording was digitised by the International Library of African Music , Original format: 15ips reel , Equipment used in digitisation: Studer B 67 Tape Recorder; Nagra III , Software: Sound Forge V.6 , Sample rate: 44100Hz 16Bit Stereo
  • Full Text: false

The Snake who bit a Girl

- Tracey, Hugh

  • Authors: Tracey, Hugh
  • Subjects: African story , Snake , Bad end
  • Language: English
  • Type: Sound , Story
  • Identifier: vital:15465 , MOA34-02 , http://hdl.handle.net/10962/d1017821 , MOA34
  • Description: Traditional african story of the snake who came to a bad end. , This recording is held at the International Library of African Music. For further information contact ilamlibrary@ru.ac.za , This recording was digitised by the International Library of African Music , Original format: 15ips reel , Equipment used in digitisation: Studer B 67 Tape Recorder; Nagra III , Software: Sound Forge V.6 , Sample rate: 44100Hz 16Bit Stereo
  • Full Text: false

The Sound of Africa: A documentary broadcast for the Canadian Broadcast Corporation

- Tracey, Hugh

The Sound of Africa: Best selection

- Tracey, Hugh, Tracey, Peggy

The Sound of Africa: Divining songs of the Xhosa

- Tracey, Hugh, Tracey, Peggy

The Sound of Africa: Eastern Congo and Ruanda-Urundi

- Tracey, Hugh

The Sound of Africa: Ganda-Soga music of Uganda

- Tracey, Hugh, Tracey, Peggy

The Sound of Africa: High Commission Territories: The music of Mozambique

- Tracey, Hugh

The Sound of Africa: Kenya

- Tracey, Hugh

The Sound of Africa: Kikuyu, Kamba and Nyika

- Tracey, Hugh, Tracey, Peggy

The Sound of Africa: Masai, Chaga, Kipsigis and Nandi

- Tracey, Hugh, Tracey, Peggy

  • Disclaimer
  • Privacy
  • Copyright
  • Contact