Includes abstract. / Includes bibliographical references. / The unique knowledge that teachers possess Shulman called pedagogical content knowledge or PCK. In the following 25 years many scholars have conceptualised PCK, and only recently, with an international PCK Summit, have attempts been made to consolidate this field. South Africa’s primary and secondary public education system is continuously under scrutiny, as it continues to perform poorly in international benchmarking assessments. The need to understand what is happening in our classrooms, especially in science and mathematics, is now more important than ever. In response to this need, this study investigated the classroom practice of a dedicated and experienced science teacher over a period of three years, as she taught the organic chemistry section of the Grade 12 Physical Sciences syllabus. PCK was used as a lens to focus on how teacher knowledge manifests in practice.

This study focuses on three projects by Gabriel Fagan, one of South Africa’s most respected and awarded architects, namely The Dias Museum in Mossel Bay, the SA Breweries Visitor’s Centre in Newlands and the University of Cape Town’s Institute of Infectious Disease and Molecular Medicine. These projects are all essentially contemporary interventions in historic fabric and each contains easily identifiable and iconic new portions – the sail-like roof of the Dias Museum, the glass lift shaft at SAB and the circular glazed pavilion at UCT’s Medical School.

Includes abstract. / Includes bibliographical references (leaves 82-86). / These studies aimed to investigate the sustainability conceptions held by engineering students and to assess their level of knowledge on sustainability concepts. The findings revealed that the level of knowledge is poor and engineering students had varying ideas on what sustainability is.

Includes bibliographical references (leaves 103-113). / A lacuna is a disruption in a figurative image and impedes comprehension of the unity of the whole. It is something missing, a void, in material form and, in some cases memory. The urge to eradicate or minimize a disruption to an aesthetic whole has long been a dilemma in conservation, particularly in painting and sculpture, but also in the repair of historical buildings. Any solution must address the issue of authenticity, as repair will be an insertion into an ancient, perhaps layered artefact. The solution requires a theoretically based methodology if the aim of the conservation intervention is to conserve the value and meaning of the building or artefact. The repair of lacunae at the Castle of Good Hope in Cape Town has had a distinct aesthetic impact on the complex and has changed the perception of the complex. The extensive three-decade-long intervention undertaken by Gabriël Fagan Architects is a re-establishment of the Castle complex as a VOC/Dutch fortified citadel as envisioned by the Architects and reveals the issues that must be confronted in order to conserve authenticity.

This dissertation examines how cultural significance has changed through the reuse (conversion) of an existing religious building to perform a new religious function. The conversion of the former Johannesburg West Nederduitsche Gereformeerde Kerk (Dutch Reformed Church) to become the Masjid-ul-Islam is used as a vehicle for this study. The history of the Afrikaner and South African Muslim communities and their architecture is explored as well as the history of the changes to the building. The post-colonial concept of hybridity is used to understand the new identity of the building. This new identity determined as being hybrid. Concepts of memory and its use in the construction of identity are further examined with the former church being understood as a site of memory. Through the personal perceptions of significance expressed by both the mosque and church communities the change in significance is explored. It is determined that the building is the site of hybrid memory, with multiple layers of significance which have created a sense of continuity for both communities creating a sense of place and continuity in the post- Apartheid city. The building has come to be a symbol of the changes that have occurred in post-Apartheid South Africa through its layering of history, sense of inclusivity and regeneration.

Includes bibliographical references (leaves 88-92). / This study investigates the appropriateness of conservation controls in low-income communities. The imposition of development controls is a limitation on the private rights of individuals in the interest of the public good. This is essential in order to preserve heritage resources for future generations. However, questions arise around this practice when such limitations have a direct negative effect on the daily struggle for survival that many people face. Many poor people cannot bear the cost associated with maintenance and restoration of old buildings, and this puts many heritage resources at risk. Actors within bureaucracies also have their own goals to achieve, and this also influences the way that heritage is managed in low-income areas. The central research question of this study is: Are conservation controls in lowincome communities appropriate? This question was explored within the context of Mamre, a historical mission station approximately 50 km north of Cape Town. Firstly, several descriptive scenarios around which the research question could be explored were constructed, and this was followed by an investigation of the relevant literature. A contextual analysis of Mamre was also completed in order to gain an understanding of the character and functioning of the village. The case study then focused on two incidents where heritage-related building applications were made. Several instances where values conflict emerged from the study, and these enabled the researcher to draw some conclusions on conservation in low-income communities. The study found that the concept of significance is not well understood by officials, and its application differs widely. It was also clear that the law is often applied in a well-intended but incorrect, and in fact at times illegal, manner. This study also found that mechanisms of financial support should be available in certain cases. In order to ensure effective conservation of heritage resources, the correct legal mechanisms and strong policy must be in place. This must be based on a thorough assessment of significance and it is essential that this is done with a good understanding of the context.

The turn of this century has been characterised by a flurry of research activities taking place around the history of Mission stations and missionaries in South Africa (SA). In Venda, in the Limpopo Province of SA, research about the Berlin Missionary Society (BMS) also gained momentum. Most of the researchers working in the area relied mainly on diaries, letters, annual reports, and limited published materials written by the BMS missionaries who worked at various mission stations in the area. These researchers focused on historical, educational, and religious developments, as captured by the Berlin missionaries. Of these historical accounts, the voices of the local communities have been hushed. Most of the stories available in written sources are from the viewpoints of the missionaries. At the same time, the focus of researchers in the heritage conservation fields has been on the physical condition of heritage properties, where the intention was to arrest deterioration of material. While there is a change in thinking in the heritage field to take into consideration the involvement of relevant stakeholders, the focus is still on the challenges related to the physical condition of heritage properties. Researchers in the heritage field have come to realise that conservation cannot unify or advance with any real innovation or vision if there is a continuation to concentrate the bulk of conservation discourse on issues of physical condition. This study addresses the issue of community participation in research by responding to the following question: What is the impact of community attitudes and perspectives towards Georgenholtz Mission Station (GHMS) as a heritage resource? Various community groupings were given the responsibility of airing their views regarding the Mission station as a heritage resource. In doing so, they were able to identify and articulate the values they associate with the mission station. Without an understanding of these values, practitioners, managers, and communities would be unable to act in respect of the gradual but rapid deterioration of the same heritage resource. Because of these values, communities were able to recommend what actions would be to the benefit of all of them. The research question of this study is answered through one-on-one oral interviews the researcher conducted with respondents. These respondents are divided into four categories of communities namely the youth, Lutheran Church leadership, Ha-Luvhimbi community leaders and members of families with historic ties with the Berlin Missionary Society. Individual respondents from these community categories were asked to comment upon the history of the Berlin Missionary Society and the development of Georgenholtz Mission Station from 1877 to the present times. They were also asked to broadly identify and explain the heritage significance of Georgenholtz Mission Station. The last question they were asked relates to what communities would like to see happening with Georgenholtz moving forward. The responses that came from these respondents show that Georgenholtz Mission Station has extensive connections to Mission history in rural South Africa which assists in conveying the significance of this Mission station beyond its importance to Ha-Luvhimbi village. Communities could identify various values attached to the Mission station, including amongst others, historical, aesthetic and architectural, social and economic values that should be preserved for the benefit of current and future generations. The results from this study indicate that communities interviewed regard Georgenholtz Mission Station as their heritage resource that should be taken care of and that there are economic benefits that could be derived from the adaptive reuse of the Mission station. The study concludes by outlining recommendations for further and extended research on the subject by other researchers.

Bibliography: leaves 139-146. / The present study has focused on exploring the extent to which metal ion activation occurs and influences flotation and how this can be managed so as to increase the separation of pentlandite from pyroxene and feldspar. The aim was to minimise the percentage pyroxene and feldspar reporting to the concentrate and simultaneously maximise the pentlandite recovery. The possible chemical reactions taking place on surfaces of synthetic pentlandite, natural pyroxene and feldspar were investigated at pH 4, 6 and 9 in di-sodium tetra borate solution and in synthetic process water in the case of zeta potential determinations, microflotation and ToF-SIMS (time of flight secondary ion mass spectrometry) analyses and in synthetic process water in the case of batch flotation tests.

Includes bibliographical references (leaves 170-181). / The Platreef is located in the northern limb of the Bushveld Complex of South Africa. This reef consists of a complex assemblage of rock types, with pyroxenites, serpentinites and calcsilicates being the most abundant. The predominant PGMs are the tellurides, arsenides, alloys and sulphides. The Pt and Pd tellurides contribute between 20-45% of the PGMs present in the Platreef ore followed by the alloys (26%), arsenides (21%) and sulphides (19%). Flotation is used in the processing of the Platreef ore to separate the siliceous gangue from the platinum group minerals (PGM) and base metal sulphides. The PGE arsenide and telluride minerals are considered to be slow floating when compared to other PGMs as there is evidence of them reporting to the tailings.This thesis aimed to investigate the flotation behaviour of these minerals and presents results which characterise the surface properties of synthetic cooperite (PtS), vysotskite (PdS), sperrylite (PtAS2), palladoarsenide (Pd2As), moncheite (PtPd(BiTe)2 and PtTe2) and merenskyite (PdPt(BiTe)2 and PdTe2) and attempts to relate the flotation behaviour of the various minerals to these characteristics.

Includes bibliographical references. / This study examines the first identification and assignment of heritage values and significance undertaken by the “establishment”, the South African Heritage Resources Agency (SAHRA) and the City of Cape Town (CCT) in the Township of Langa in the Cape Province a decade ago. In brief, this is the story of Langa migrant labour hostels reviewed for its meaning as heritage to the diverse communities within Langa, compared with an earlier 2001/2 official evaluation by the state-led heritage management institutions. It is within a broader socio-political, cultural and heritage discourse context that this research project explores what the residents of Langa find significant. This is done with particular reference to the migrant labour hostel schemes since the intention was to establish to what extent conservation and heritage management is an appropriate response in an environment of material, economic and social difficulties; and, if so, to what degree the inhabitants of the hostels’ sense of value correspond to that articulated in the “official statement of significance” of 2004. This study questions the validity of nominating migrant labour hostels as “Grade I” national heritage resources.