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Showing results 182191 to 182200 of 205394

  1. The structures of irradiation damage centres in diamond
    Kirui, Joseph Kiprono, 2008-06-30T10:11:54Z
    Electron Paramagnetic Resonance (EPR) has been used to study radiation damage centres in type Ib diamonds which were either electron- or neutron irradiated. The isochronal annealing behaviour has been determined for a number of EPR centres up to 850 oC. The centres W11, W2, W13 and W14 as well as ...
  2. Development of a novel extraction technique based on combination of molecular imprinted polymers and liquid membrane for biomedical and environmental applications
    Nemulenzi, Ntakadzeni Olga, 2008-06-30T11:16:22Z
    In this study a novel technique for extraction of biological and environmental samples was investigated. The developed technique is based on the combination of liquid membrane and molecular imprinted polymers technologies referred to as liquid membrane-molecular imprinting polymers extraction techni ...
  3. Hedging credit risk using equity derivatives
    Teixeira, Paul, 2008-06-30T11:35:38Z
    Equity and credit markets are often treated as independent markets. In this dissertation our objec- tive is to hedge a position in a credit default swap with either shares or share options. Structural models enable us to link credit risk to equity risk via the ¯rm"s asset value. With an extended ...
  4. The antimicrobial properties and chemical composition of leaf extracts and essential oils of indigenous Pteronia species
    Coovadia, Zubair Hoosen, 2008-06-30T12:07:12Z
    Abstract The genus Pteronia consists of approximately 80 species which are widely distributed in southern Africa. For hundreds of years the indigenous people of southern Africa have turned to the earth in order to provide healing for their people. The genus Pteronia has been amongst the firs ...
  5. Lukas Ligeti as a unique elecroacoustic composer-performer: with reference to the instrument "Marimba Lumina".
    Netshivhambe, Evans Ntshengedzeni, 2008-07-03T09:50:12Z
    Abstract This research report investigates the role of the musical instrument, Marimba Lumina in the post-electronic music compositions by Lukas Ligeti, musician, performer and composer. Innovative works require new kinds of interfaces and instruments for new modes of musical expression. Post-el ...
  6. Guiding dilemmas and principles informing psychotherapeutic work with African refugees in South Africa.
    Grootenhuis, Geertje-Kieke, 2008-07-03T10:22:02Z
    Abstract Therapists seeing refugee populations often struggle with the traditional boundaries of psychotherapy and conventional wisdom’s about therapeutic goals and practice. The social, political and cultural context of the therapeutic work throws up dilemmas and constraints that need to be bet ...
  7. Assessment practices in a first year academic writing module at the University of the Witwatersrand and the National University of Rwanda.
    Nyiratunga, Ritha, 2008-07-03T10:50:58Z
    ABSTRACT Scholars in the field of assessment recognize its key role in teaching and learning (Knight 1998, Brown and Knight 1996, Gipps 1994, Glaser 1990, Van Rooyen and Prinsloo 2003). According to Knight, assessment is ‘the most significant prompt for learning’ (1998:37). This study aimed to u ...
  8. A single-beam positron emission computerized tomography study of trichotillomania in terms of cognitive behaviour therapy
    Gordon, Charmaine, 2008-07-07T12:57:39Z
    ABSTRACT Trichotillomania was first defined over a hundred years ago as a self inflicted alopecia resulting from avulsion of hair. Previous Positron Emission Tomography (PET) studies have shown increased count density in the right superior parietal region of patients suffering from trichotillomania ...
  9. Teachers" selection and use of tasks in the old and new curriculum.
    Modau, Aloysius Stephen, 2008-07-08T11:36:06Z
    Abstract This study investigates how a teacher selects and implements mathematical tasks in the old and new curriculum. Two theoretical perspectives: constructivist theories of learning and the socio-cultural theories were discussed in order to provide a framework from which to understand how te ...