Lived experience of positional suffering for room attendants at Rhodes University: insights for the transformation agenda
- Authors: Toli, Vuyolwethu
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/7890 , vital:21320
- Description: Taking insights from the domestic work literature both locally and internationally, this study explores the lived experiences of room attendants who work as cleaners in the students’ residences at Rhodes University. The study focuses on the housekeeping division of Rhodes University. Data was generated from in-depth individual interviews and focus groups with 26 women and 3 men participants (aged between 28 and 60) who work as room attendants, and who were recruited from the residences across the university. The phenomenological approach allowed the participants to articulate in-depth, their experiences of working as room attendants in intimate spaces. This study used a triangulated conceptual framework, which amalgamated the concepts of pain, social space and intersectionality, and exploitation under the umbrella concept of positional suffering. Within a higher education transformation agenda which has marginalised the experiences of unskilled workers at the university, the study seeks to bring insights to the understanding of transformation at Rhodes University through the experiences of the being-in-the-world of room attendants.
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- Date Issued: 2017
Lizalise Idinga Lakho [Honour Thy Promise]: The Methodist Church Women’s Manyano, the Bifurcated Public Sphere, Divine Strength, Ubufazi and Motherhood in Post-Apartheid South Africa
- Authors: Ngcobozi, Lihle
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/17717 , vital:22271
- Description: This study examines the socio-political role of the Christian church based women’s Manyano organisations in post-apartheid South Africa. Specifically, the study examines the ways in which the women’s Manyano organisations offer black women a site for the performance of citizenship. The study is based on life history interviews conducted with seventeen members of the Methodist Church Women’s Manyano of the Lamontville Circuit in Kwa-Zulu Natal. The study shows that dominant literature on Manyano women is primarily located in the historiography of the formation of Manyano groups within the historical development of the black church from the moment of missionary contact in South Africa. This literature shows that the missionaries used the coming together of black women in the church to promote ideas of devout domesticity that are based on Anglophone Victorian womanhood. This literature also shows that the structural constraints of colonisation and apartheid transformed the black church into a counterpublic space which focused largely on the liberation of the black majority from political, economic, and social exclusion from the colonial and apartheid public sphere. These constraints also transformed the role of women’s Manyano organisations to become an important space from which black women came to resist and defeat apartheid. This study shows that this historical framing of women’s Manyano groups has shaped their role in post-apartheid South Africa. Located in the African feminist theory, the study argues that Manyano women’s publicness is not limited to gendered expressions of the public and private sphere. Instead, Manyano women demonstrate that their publicness in post-apartheid South Africa ought to be understood through a combination of the varied identities that they straddle, such as those of a politically and culturally defined womanhood and communally based motherhood, which express their understanding and performance of citizenship. The thesis, therefore, argues that the contemporary role and functioning of Manyanos is located within both the hegemonic public sphere that is granted by the civil liberties of the new South Africa, and the historical black bifurcated counterpublic -which combined offer black women the ability to devise strategies to confront present-day socioeconomic challenges such as structural poverty that shapes the lives of the majority of black women in post-apartheid South Africa. The study contributes, therefore, to the reconstruction of the concept of the public sphere through the use of Manyano women’s dynamic position in post-apartheid South Africa. It shows that the dualist nature of Manyano women’s position and identity allows for a multifaceted approach in the understanding of citizenship for Manyano women today. Furthermore, and importantly, the study shows that the complex roles that Manyano women navigate within the different spheres complicate the interpretations of womanhood and motherhood as understood in dominant (white western) feminist theory in ways that often lead to the delegitimisation and erasure of Manyano women’s contributions to ideas about post-apartheid feminisms.
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- Date Issued: 2017
Lurking or listening? an ethnographic study of online and offline student political participation through the #MustFall protests at Rhodes University
- Authors: Govender, Carissa Jade
- Date: 2017
- Subjects: #Feesmustfall , #Rhodesmustfall , Social media -- Political aspects -- South Africa , Social movements -- South Africa , Political participation -- South Africa , Online social networks -- Political aspects -- South Africa , Student movements -- South Africa , Rhodes University -- Students
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/35123 , vital:24330
- Description: The way media is created and consumed plays an important role in political participation as it provides information, guides thinking and allows citizens to make informed political choices. It can also interrogate the status quo and challenge existing systems or power relations. This thesis discusses the use of social media by Rhodes University students in the context of the 2015 #RhodesMustFall and #FeesMustFall protests in South Africa. This thesis interrogates the concept of slacktivism, a term used to describe online or digital activism which is considered to be less active and not as effective as physical activism. Furthermore, the thesis acknowledges that even when digital political participation is recognised, the emphasis and value is placed on those who speak and create content. The thesis examines the notion of participation and what counts as active citizenship. In particular, the majority of social media users who merely lurk and never contribute to content creation or online discussions are further investigated. The qualitative methodological approach used for this thesis involved three parts which looked at student activity on Facebook, student engagement offline, and how students made sense of their online and offline involvement. Firstly, a cyberethnographic investigation was done in order to understand the cyber world in which students are present. Thereafter, a participant observation was carried out to immerse myself in the offline spaces that students engaged in politically, to get a better sense of how their online presence influenced or supplemented their offline activity. Finally, individual interviews were carried out with lurkers to determine why they did not participate in traditional ways, both online and offline. The findings suggest that lurkers are in fact doing more than just being passively present. The high levels of attention paid to content posted by others on social media, as well as the way that the content influences their offline lives suggest that the choice to lurk is far more active than assumed. Students are consciously deciding to lurk for a multitude of reasons, one of which is for the opportunity to learn. Social media is a fast developing; increasingly used form of communication and how political communication across social media platforms is framed affects what we consider to be active engagement. By using theories of listening and emotion talk, the thesis provides new ways of understanding lurking by Rhodes University students on social media, which in turn can lead to better listening, better understanding and greater political participation.
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- Date Issued: 2017
L’etude comparative des elements merveilleux dans trois epopees africaines: Soundjata ou I’epopee mandingue, Emperor Shaka The Great: a Zulu Epic et Nsongo’a Lianja: I’epopee nationale des Nkundo
- Authors: Nkaongami, Josue Bosange
- Date: 2017
- Language: French , English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/5590 , vital:20944
- Description: This thesis is a comparative study in Francophone literature which analyses the supernatural factors in three African epics, namely the Sundiata or Mandingo Epic from West Africa by Djibril Tasmir Niane (1960), Emperor Shaka The Great : A Zulu Epic from Southern Africa by Mazisi Kunene (1979), and Nsongo’a Lianja : the National Epic of Nkundo People from Central Africa by Edmond Boelaert (1949). The study analyses similarities and differences between the supernatural figures in these epics and their respective societies using contextual and socio-critical theories. In this thesis it is demonstrated that the presence of supernatural forces is a sine qua non condition for the existence of the epic in the sense that : “the essential mark of the heroic personality in many African folk epics is its reliance on supernatural resources” (Okpewho 1979 : 119). This study shows that in Africa, supernatural forces play vital roles in the society and therefore dominate the African oral epic traditions. Furthermore, the study is significant in the sense that it tries to describe the worldview, especially the religious and cultural beliefs of the particular society or group that produces the epic. The thesis is made up of six chapters. In the first chapter, I outline the study’s subject matter, its aims and objectives, its significance, its assumptions and methodology. In the second chapter, I examine the impact of supernatural devices on the lives of the epic heroes Sundiata, Shaka, and Lianja, the predictions and divinations about their births, childhoods, exiles or epic journeys, their ascension to the throne as well as their genealogies and deaths. Such analysis allows one to identify the supernatural factors surrounding each stage of the life of the heroes, and to understand further the importance of supernatural forces in the communities and institutions where the heroes exercise their powers. In the third chapter, I discuss the typology of the supernatural forces in the heroic epics Sundiata, Shaka and Lianja, using Greimas’s theory of actants. I divide the characters into protagonists, accessories and opponents. In the fourth chapter, I examine the sources of the supernatural forces prevailing on Sundiata, Shaka, and Lianja. The chapter shows how supernatural agents act on the epic heroes and how these supernatural beings make or mar them in the course of the narratives. In the fifth chapter, I investigate the supernatural factors acting on the heroes’ opponents, and in chapter six, I examine the supernatural forces and heroism of the women in the three epics. In the conclusion, I demonstrate that this analysis of supernatural factors enables us not only to appreciate their place and function in the three African epics under study, but also opens a window onto the culture of the Mandingo, Zulu, and Mongo People’s : their activities, beliefs, taboos and the rules which organise their respective societies. , This thesis is presented in two parts: French and English.
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- Date Issued: 2017
Maimed bodies in George R.R. Martin’s A song of ice and fire
- Authors: Goodenough, Amy Caroline
- Date: 2017
- Subjects: Martin, George R. R. -- Song of ice and fire , Violence in literature , Fantasy fiction -- History and criticism
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7301 , vital:21240
- Description: George R.R. Martin’s fantasy series, A Song of Ice and Fire, has joined franchises like Harry Potter and The Lord of the Rings at the forefront of popular culture. Unlike other popular fantasy franchises, however, Song is notably ‘gritty’ - inspired as much by the realism of historical fiction as it is by its fantastical predecessors. The novels focus on a massive struggle for power, and that struggle is a famously bloody one: the violence of the novel’s medieval-inspired world and of medieval warfare, is placed front and center. This thesis argues that Song portrays this excessive violence with a view to more than mere sensation. The body is central to Martin’s text, and since power is the object of Martin’s characters, he depicts the way in which power interacts with the body with sophistication. The use of capital and corporal punishment is foregrounded frequently in the text, and presented as central to the process of ruling, but horrifying in its potential for injustice. For all that these acts of maiming - public execution, public torture - may be presented as ceremonies of justice, Martin makes it evident that they are in fact rituals of power. The spectacular display of maimed bodies occurs frequently - so frequently that it is clearly ordinary to Martin’s characters - and nearly always with a view to creating a perception of power. Heads are spiked on castle walls, gibbets hung in town squares, and slaves crucified on road-signs, and these all speak not of the criminality of the victims, but of the power of those doing the punishing. While such displays may be successful, they usually signal weakness to the reader: Martin writes numerous characters whose acts of violence come as misplaced reactions to their own vulnerability. This dynamic comes to the fore most powerfully in the absurd performances of violence by Theon Greyjoy, and, later, in his torture by Ramsay Bolton.
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- Date Issued: 2017
Malawi’s foreign policy decision-making: the 2012 Malawi-Tanzania boundary dispute
- Authors: Kaunda, Mapopa Charles Martin Sazamleke
- Date: 2017
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/59225 , vital:27484
- Description: Expected release date-April 2019
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- Date Issued: 2017
Malawi’s trilemma: monetary policy independence, exchange rate stability and financial integration
- Authors: Kamamkhudza, Charity
- Date: 2017
- Subjects: Malawi -- Economic conditions , Economic policy -- Malawi , Monetary policy -- Malawi , Foreign exchange rates -- Malawi
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/41634 , vital:25112
- Description: Malawi has, in the last few decades, undergone several reforms relating to monetary, exchange rate and financial integration policies in a bid to achieve sustainable economic growth. Despite these reforms, however, the country has barely attained desirable macroeconomic performance. This study sets out to establish if the need for these policy reforms is due to the fact that the country is constrained from the simultaneous achievement of optimal levels of monetary policy independence, exchange rate stability and financial integration, as postulated by the ‘trilemma’. The trilemma is evaluated using an approach introduced by Aizenman et al. (2008), in which the Ordinary Least Squares (OLS) method is applied to a model in which a constant is regressed on indices constructed for the policy intermediate goals; the results indicate that the trilemma is a binding constraint in Malawi and that the largest trade-off is between exchange rate stability and financial integration. Given these constraints, the study also considers the combination of the trilemma intermediate policy goals that has been dominant in the country in the last three decades, using predicted values from the model and a graphical analysis to explore this objective. The analysis reveals that Malawi has, on average, prioritised exchange rate stability and monetary policy independence at the expense of financial integration. The study also assesses how the trilemma intermediate policy goals affect macroeconomic performance, specifically regarding output growth rate and inflation. The results reveal that exchange rate stability is associated with faster output growth, financial integration is associated with higher inflation, and that monetary policy independence is not a significant factor. The results emphasise the importance of consistent stability of the exchange rate if Malawi is to achieve faster and sustainable economic growth. Given this, policy makers must be cautious, as the current floating exchange rate regime, combined with financial integration, could lead to slow growth and high inflation.
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- Date Issued: 2017
Masculine performance and enactment in the Rhodes University Rowing Club
- Authors: Dlamini, Thobile Lungile
- Date: 2017
- Subjects: Masculinity in sports -- South Africa , College sports -- South Africa , Male college athletes -- Psychology -- South Africa -- Case studies , Masculinity , Sex role , Rhodes University. Rowing Club , Rhodes University -- Students -- Psychology
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/4315 , vital:20647
- Description: Drawing on the interactions between gender and power in the South African context, this study explores how masculinities are produced, reproduced and contested in one particular realm of social life, namely organised university sport. The study focuses on a rowing club at a historically white South African university (RURC). The narratives of ten male participants (aged between 19 and 23) who self-identified as heterosexual and were recruited from RURC, were utilised to make meaning of the process of identity construction of young males who participate in organised sport within the higher education sphere. The ethnographic aspect of the study, which spanned over three months, provided a window into the norms, values and rituals of the club and how these variously reinforce or interrupt the prevailing gender order. Employing Connell’s typology of masculinities as a lens, the study traces the lived construction of masculinity in the individual lives of the members of RURC as one sphere of university life in which masculinities are produced and contested. Within a wider culture that has been characterised as white, heteronormative and patriarchal, the study argues that although masculinities and masculine performances in the RURC are highly contested the practices of the club ultimately perpetuate an exclusionary, orthodox masculinity.
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- Date Issued: 2017
MEQSILHOUETTE: a mm-VLBI observation and signal corruption simulator
- Authors: Blecher, Tariq
- Date: 2017
- Subjects: Large astronomical telescopes , Very long baseline interferometry , MEQSILHOUETTE (Software) , Event horizon telescope
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/40713 , vital:25019
- Description: The Event Horizon Telescope (EHT) aims to resolve the innermost emission of nearby supermassive black holes, Sgr A* and M87, on event horizon scales. This emission is predicted to be gravitationally lensed by the black hole which should produce a shadow (or silhouette) feature, a precise measurement of which is a test of gravity in the strong-field regime. This emission is also an ideal probe of the innermost accretion and jet-launch physics, offering the new insights into this data-limited observing regime. The EHT will use the technique of Very Long Baseline Interferometry (VLBI) at (sub)millimetre wavelengths, which has a diffraction limited angular resolution of order ~ 10 µ-arcsec. However, this technique suffers from unique challenges, including scattering and attenuation in the troposphere and interstellar medium; variable source structure; as well as antenna pointing errors comparable to the size of the primary beam. In this thesis, we present the meqsilhouette software package which is focused towards simulating realistic EHT data. It has the capability to simulate a time-variable source, and includes realistic descriptions of the effects of the troposphere, the interstellar medium as well as primary beams and associated antenna pointing errors. We have demonstrated through several examples simulations that these effects can limit the ability to measure the key science parameters. This simulator can be used to research calibration, parameter estimation and imaging strategies, as well as gain insight into possible systematic uncertainties.
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- Date Issued: 2017
Microbial water quality monitoring of raw and treated water sources in Harare and the effect of gender in disaster management due to water related disasters
- Authors: Chirenda, Tatenda Grace
- Date: 2017
- Subjects: Drinking water Microbiology Zimbabwe Harare , Heterotrophic bacteria Zimbabwe Harare , Emergency management Zimbabwe Harare , Disasters Social aspects Zimbabwe Harare , Water quality management Zimbabwe Harare , Public health Zimbabwe Harare , Sex role Zimbabwe Harare
- Language: English
- Type: text , Thesis , Masters , MPharm
- Identifier: http://hdl.handle.net/10962/59156 , vital:27444
- Description: Background - Microbial water quality monitoring is essential to the provision of potable water for domestic use. Unsafe water sources increase the risk of waterborne diseases. There is a need to raise awareness of legislature that supports management of water related disasters. Gender, education, health, and economic vulnerability contribute to the success of disaster management. Aim - This study aimed to investigate the microbial water quality of treated water in the Harare area. The study also researched the microbial water quality monitoring practices in Zimbabwe and how these contribute to the management of water borne diseases. The impact of gender, marriage, education, and disease in disaster management practices in Zimbabwe and South Africa was analysed. Method - Literature review was conducted on microbial water quality monitoring practices in Zimbabwe and legislature that supports disaster management. Practices of disaster management in Zimbabwe, and South Africa were investigated and compared. The perspective of the Harare community on the quality of their potable water was investigated through the use of a questionnaire and water quality testing was conducted using hydrogen sulphide test and R2A based heterotrophic plate count. Raw water supplying Manyame River and tap water in Harare households were assessed for microbial quality. Results and Discussion - Raw water sources were found to be contaminated by faecal matter. Household water sources had no faecal contamination, but tested positive for heterotrophic bacteria. The CFU/ml quantities obtained ranged from 1- 452 CFU/ml for all samples. The WHO guidelines for domestic water sources recommend that domestic water should have no coliforms/100 ml sample. Disaster management protocols were available in disaster prone areas such as the Matabeleland South Province. No guidelines were in place for monitoring microbial water quality as a disaster prevention method. Conclusion - The current state of treated water supplied by the Morton Jaffray Treatment Plant was found to be suitable for domestic use, but not sufficient to meet the Harare population’s needs. The need to push for legislature supporting microbial water quality monitoring was recognised. Initiating public / private partnerships in water distribution and water quality monitoring in Zimbabwe was encouraged.
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- Date Issued: 2017
Middle management communication in the midst of a crisis
- Authors: Mbolekwano, Veliswa A
- Date: 2017
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/52477 , vital:26194
- Description: Crisis communication by organisational top leadership to external stakeholders has been explored in literature, while internal crisis communication dynamics by middle managers with their employees within the organisation has been under studied. This paper pursues an understanding of crisis communication dynamics between middle management and their subordinates by investigating how the Middle Managers/Team Leaders of Makana Brick Manufacturing Firm (MBMF) communicated with their employees in the midst of the Eskom load shedding crisis in 2014. The investigation is not limited only to how they handled or made sense of the crisis, but also examines the effect and efficiency of their daily communication on both employees (subordinates) and operations in pursuing this end. As a foundation and background, the study broadly explores the literature on Crisis Leadership, Crisis and Crisis Communication, which are critical topics to understanding the communication role of the middle managers who were the primary subject of this research. The research was conducted through semi-structured, face-to-face interviews. Nine Team Leaders were interviewed. The data collected was transcribed verbatim and analysed through open coding. In the literature of crisis management, the concept of crisis communication has been extensively examined as a function of crisis management, primarily with regards to the crisis communication strategy, encompassing the actual verbal and nonverbal responses an organisation uses to address a crisis. The findings are generally congruent with the crisis communication literature, and reinforce the importance of efficient internal communication in building a culture of transparency between management and employees, as espoused in the literature reviewed, which in addition presents an invaluable opportunity for employees across all levels to engage in and be informed of the organisation’s priorities and therefore has the potential to dictate the success or failure of any major change or crisis situation. As such, it can be argued that there is a need for the same analytical rigour that is given to external crisis communication to be given to financial or operational measures (Barrett, 2002). For both external and internal stakeholders, human compassion, concern and empathy; faith in legitimate and appropriate actions taken by the chosen organisation spokesperson; and honesty, candidness and openness in communication (Seeger 2006, p. 242) are universal. The quality and the quantity of communication, essentially, affect the level of trust and involvement of employees (Thomas, Zolin & Hartman, 2009), which is particularly relevant in times of crisis (Mazzei & Ravazzani, 2015 p. 322). Trust must be developed with staff through clear, honest communication and transparent actions. These encompass being fair, open in communication and intentions, showing consistency, fulfilling promises and being honest about what middle managers can and cannot communicate to their employees (Farrel & Schlesinger, 2013, p. 125). In this study, face to face communication proved to be the most preferred communication channel because of its rewarding advantages such as direct feedback, two-way communication, relationship building and project collaboration.
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- Date Issued: 2017
Mineralogical and geochemical constraints on the origin, alteration history and metallogenic significance of the Manganore iron-formation, Northern Cape Province, South Africa
- Authors: Papadopoulos, Vlassis
- Date: 2017
- Subjects: Banded iron formation , Transvaal Supergroup (South Africa) , Groups (Stratigraphy) South Africa , Lithostratigraphy , Petrology South Africa , Geochemistry South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65189 , vital:28702
- Description: The Manganore iron-formation (MIF) of the Transvaal Supergroup is host to the most important high-grade iron ore bodies in South Africa. Prevailing models for ore genesis invoke supergene processes performing during a long period of erosion, oxidation and weathering under tropical lateritic conditions while the role of potential hydrothermal processes is not addressed. Lack of detailed petrographical and geochemical data necessitated reexamination of the MIF through new and existing drill core exploration material. Thorough petrographical investigation revealed a multi-event complex alteration history involving hydrothermal activity. Iron and silica mobility during alteration is demonstrated by a series of replacement, overprinting, crosscutting textures, extensive silicification and hematitization. Metasomatized textures such as pseudomorphs of primary magnetite, carbonate minerals and chert pods/lenses point to an alteration occurring in layer- controlled fronts and link stratigraphically the MIF to Kuruman and Griquatown iron- formations. Whole-rock geochemical data verify textural observations suggesting strong enrichment of iron or silica in meter-scale horizons, expressed by different generations of quartz and hematite. High-grade iron ore is highly enriched in TiO2 and Al2O3 compared to the protolith while both BIF and iron ore display highly increased concentrations of trace elements (transition metals and HFSE). Oxygen isotopes from different quartz textures reveal little to none isotopic exchangement during alteration whereas O isotopes from hematite are in concert to values from literature and suggest two different generations of hematite. A total of 20 minerals apart from quartz and hematite were documented. An earlier alkali/HFSE alteration event that is believed to have affected the overlying Gamagara shales is recorded in the BIF by the presence of muscovite, apatite, rutile, zircon and xenotime. A later and possibly ongoing event of succeeding hydrothermal pulses involves mainly sulphates (gypsum, baryte, celestine), pyrite, carbonates (siderite, calcite) and silicates (berthierine and tourmaline). Alkali-bearing brines persistently exploit the BIF mainly through karstification-related secondary porosity, are evidently carrying iron and are proposed to participate in or control the iron enrichment by facilitating removal of silica. The source of metals, sulfur and carbon is attributed to the underlying Campbellrand dolomites and especially to the upper Gamogaan Formation. The unconformable contact between BIF and the overlying shales is suggested as a suitable fluid conduit for the development of the observed BIF and shale-derived high-grade hematite iron ore.
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- Date Issued: 2017
Mineralogical variation in the basal Upper Zone, Bushveld Igneous Complex, South Africa: implications for ore genesis and mineral extraction
- Authors: Van Huyssteen, Darryn Ashley
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5060 , vital:20762
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- Date Issued: 2017
Mineralogy and geochemistry of structurally-controlled metasomatic alteration of carbonate-rich manganese ore at Mamatwan Mine, Kalahari Manganese Field
- Authors: Harawa, Esau Tonderai
- Date: 2017
- Subjects: Metasomatism (Mineralogy) , Manganese ores -- Geology -- South Africa , Geology -- South Africa , Mamatwan Mine (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4717 , vital:20715
- Description: The Kalahari Manganese Field (KMF) located in the Northern Cape Province about 700km south west of Johannesburg contains 80% of the world manganese ore reserves. Mamatwan Mine is hosted within the low grade Mamatwan type ore and is located in the southernmost tip of the KMF. This mine is an open pit mine which is divided into three benches namely the top cut, middle cut and bottom cut. These three benches are structurally controlled by faults which influence the overall grade of the manganese ore. This study is a follow up work to the previous two studies carried out at Wessels Mine and Mamatwan Mine by (Gutzmer and Beukes) in 1995 and 1996 respectively with regards to alteration processes around fault controlled systems in which they concluded that epithermal fluids caused local reduction and bleaching of ore followed by oxidation and carbonate leaching of manganese ore through ascending oxidized groundwater. Metasomatic activity around fault controlled systems is controlled by three main processes namely redistribution, enrichment and depletion. These processes are determined by mobility/immobility of elements from the fault which are introduced into the pre-existing braunite carbonate rich ore. Elements such as Ca, Mg, Si, Fe, C and Mn interact with pre-existing ore due to temperature, fluid pressure, physico-chemical property of fluid gradient. Structurally, faulting and folding contribute to the movement of elements as one end of the system gets depleted the other end of the system gets enriched and vice versa. To better understand this metasomatic activity, it is crucial to conduct mass balance studies of these elements. Grant (1986) introduced the isocon diagram which is a modification of Gresen’s equation (1967) to ascertain which elements are directly or indirectly related to alteration through enrichment and depletion of Ca, Mg, Si, Fe, C and Mn. As the section approaches from altered to less altered manganese ore the mineral chemistry gradually changes from a manganese rich matrix composed of manganomelane and todorokite to a carbonate rich matrix composed of braunite, dolomite, kutnohorite and Mn-rich calcites.
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- Date Issued: 2017
Missing values: a closer look
- Authors: Thorpe, Kerri
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/d1017827 , vital:20798
- Description: Problem: In today’s world, missing values are more present than ever. Due to the ever-changing and fast paced global society in which we live, most business and research data produced around the world contain missing data. This means that locating data which is meticulously precise can be a hard task in itself, but at times may prove essential as the consequences of making use of incomplete data could be disastrous. The reasons for missing data cropping up in almost all forms of work are numerous and shall be discussed in this dissertation. For example, those being interviewed or polled may choose to simply ignore questions which are posed to them, recording equipment may malfunction or be misplaced, or organisers may not be able to locate the respondent in order to rectify the missing data. Whatever the reasons for data being incomplete, it is necessary to avoid having to use inefficient and incomplete data as a result from the above problems. Therefore, various strategies or methods have been developed in order to handle these missing values. It is important, however, that these strategies or methods are utilised effectively as missing data treatment can introduce bias into the analysis. This dissertation shall look at these and other problems in more detail by using a data set which consists of records for 581 children who were interviewed in 1990 as part of the National Longitudinal Survey of Youth (NLSY). Approach: As mentioned above, many strategies or methods have been developed in order to deal with missing values. More specifically, traditional methods such as complete case analysis, available case analysis or single imputation are widely used by researchers and shall be discussed herein. Although these methods are simple and easy to implement, they require assumptions about the data that are not often satisfied in practice. Over the years, more up to date and relevant methods, such as multiple imputation and maximum likelihood have been developed. These methods rely on weaker assumptions and contain superior statistical properties when compared to the traditional techniques. In this dissertation, these traditional methods shall be reviewed and assessed in SAS and shall be compared to the more modern techniques. Results: The ad hoc techniques for handling missing data such as complete case and available case methods produce biased parameter estimates when the data is not missing completely at random (MCAR). Single imputation techniques likewise produce biased estimates as well as result in the underestimation of standard errors. Although the expectation maximisation (EM) algorithm yields unbiased parameter estimates, the lack of convenient standard errors suggests that using this algorithm for hypothesis testing is not a good idea. Multiple imputation, however, yields unbiased parameter estimates and correctly estimates standard errors. Conclusion: Ignoring missing data in any analysis produces biased parameter estimates. Using single imputation to handle missing values is not recommended, as using a single value to replace missing values does not account for the variation that would have been present if the variables were observed. As a result, the variance will be greatly underestimated. The more modern missing data methods such as the EM algorithm and multiple imputation are preferred over the traditional techniques as they require less stringent assumptions and they also mitigate the downsides of the older methods.
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- Date Issued: 2017
Modelling the causality between FDI and Zimbabwe’s economic growth
- Authors: Mashamhanda, Tendai
- Date: 2017
- Subjects: Investments, Foreign -- Zimbabwe , Zimbabwe -- Economic conditions -- 1965-1980 , Zimbabwe -- Economic conditions -- 1980-
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/50260 , vital:25970
- Description: The study investigates the causal nexus between economic growth and FDI in Zimbabwe for the period spanning 1976 to 2011. The bounds testing approach to cointegration and Granger causality methodology was applied and results suggest a bi-directional causal relationship between FDI and economic growth in the long run. However, the causal effect from economic growth to FDI was weak. Domestic investment, human capital and trade openness were also found to be crucial determinants of economic growth in Zimbabwe. Implementing policies that promote inflow of FDI into Zimbabwe are recommended.
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- Date Issued: 2017
Modelling water quality : complexity versus simplicity
- Authors: Jacobs, Haden
- Date: 2017
- Subjects: Water quality management -- Mathematical models , Water quality -- Measurement , Water quality biological assessment
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4754 , vital:20721
- Description: Water quality management makes use of water quality models as decision making tools. Water quality management decisions need to be informed by information that is as reliable as possible. There are many situations where observational data are limited and therefore models or simulation methods have a significant role to play in providing some information that can be used to guide management decisions. Water quality modelling is the use of mathematical equations and statistics to represent the processes affecting water quality in the natural environment. Water quality data are expensive and difficult to obtain. Nutrient sampling requires a technician to obtain ‘grab samples’ which need to be kept at low temperatures and analysed in a laboratory. The laboratory analyses of nutrients is expensive and time consuming. The data required by water quality models are seldom available as complete datasets of sufficient length. This is especially true for ungauged regions, either in small rural catchments or even major rivers in developing countries. Water quality modelling requires simulated or observed water quantity data as water quality is affected by water quantity. Both the water quality modelling and water quantity modelling require data to simulate the required processes. Data are necessary for both model structure as well as model set up for calibration and validation. This study aimed to investigate the simulation of water quality in a low order stream with limited observed data using a relatively complex as well as a much simpler water quality model, represented by QUAL2K and an in-house developed Mass Balance Nutrient (MBN) model, respectively. The two models differ greatly in the approach adopted for water quality modelling, with QUAL2K being an instream water quality fate model and the MBN model being a catchment scale model that links water quantity and quality. The MBN model uses hydrological routines to simulate those components of the hydrological cycle that are expected to differ with respect to their water quality signatures (low flows, high flows, etc.). Incremental flows are broken down into flow fractions, and nutrient signatures are assigned to fractions to represent catchment nutrient load input. A linear regression linked to an urban runoff model was used to simulate water quality entering the river system from failing municipal infrastructure, which was found to be a highly variable source of nutrients within the system. A simple algal model was adapted from CE-QUAL-W2 to simulate nutrient assimilation by benthic algae. QUAL2K, an instream water quality fate model, proved unsuitable for modelling diffuse sources for a wide range of conditions and was data intensive when compared to the data requirements of the MBN model. QUAL2K did not simulate water quality accurately over a wide range of flow conditions and was found to be more suitable to simulating point sources. The MBN model did not provide accurate results in terms of the simulation of individual daily water quality values; however, the general trends and frequency characteristics of the simulations were satisfactory. Despite some uncertainties, the MBN model remains useful for extending data for catchments with limited observed water quality data. The MBN model was found to be more suitable for South African conditions than QUAL2K, given the data requirements of each model and water quality and flow data available from the Department of Water and Sanitation. The MBN model was found to be particularly useful by providing frequency distributions of water quality loads or concentrations using minimal data that can be related to the risks of exceeding management thresholds.
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- Date Issued: 2017
Modern celebrity and inspiration in South Africa: an examination of the Mail & Guardian 200 Young South Africans
- Authors: Lishivha, Welcome
- Date: 2017
- Subjects: Youth in mass media -- South Africa , Youth -- Social conditions -- South Africa , Mail & Guardian , Mail & Guardian 200 Young South Africans
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/5165 , vital:20782
- Description: The postapartheid condition of a majority of young people in South Africa is substantially similar to the apartheid conditions under which their parents lived. This results in a dominant narrative in the media and everyday talk circulating in South African that the youth are a ‘lost generation’ and also that they represent a significant danger and risk for the stability of our democracy. Against this backdrop The Mail and Guardian, one of the South Africa’s most influential newspapers has chosen to celebrate a small number of young people every year as inspirational and extraordinary in their achievements. This investigation into this representation of a significant - although small - group of young South Africans employed content analysis of the 2015 edition of 200 Young South Africans, interviews with profiled individuals across the years, and a focus group of readers. The study aimed to unpack the complexity of constructing certain young people as exemplary given the structural conditions that constrain and prevent a majority from attaining the education and mobility they need to make a difference in their own lives. The study found through the content analysis that the Mail&Guardian is setting up these young people as exemplary citizens whose actions should inspire other young people to similarly ‘make a difference’. Through the interviews the study found that those featured on the list found both that there was significant social capital in being valorised this way, but that this position was also a complex one to negotiate given the structural limitations of poverty and lack of education for those out of whom they had been chosen. The readers in the focus group did find inspiration in reading about their exemplary peers but they too were conscious of how small a group this was in comparison to the majority of young South Africans. In conclusion the study found that the narrative of hope, inspiration and making a difference is an important message in relation to a generalised hopelessness about South African youth but that it runs the risk of ignoring the significant structural constraints that young, poor, undereducated, unskilled young South Africans face.
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- Date Issued: 2017
Molecular cloning and expression of equine CYP1A2 in Escherichia coli
- Authors: Mkabayi, Lithalethu
- Date: 2017
- Subjects: Escherichia coli , Escherichia coli infections in animals , Cytochrome P-450 , Cytochromes , Horses -- Effect of drugs on
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4830 , vital:20734
- Description: Information regarding drug metabolism in veterinary species, especially horses, remains fragmented and incomplete. This information is essential for detection of metabolites of potential performance-enhancing substances in horseracing and for veterinary drug development. Equine liver microsomes have been used to study metabolism of a limited number of drugs, but these provide little information about individual drug metabolizing enzymes. Recombinant CYP enzyme systems are commonly used to determine contribution of individual CYP to metabolism of specific drugs. A limited number of recombinant equine CYPs have been expressed in insect cells and mammalian cell lines. However, there are no reports of recombinant equine CYP1A2 enzyme. In this study, equine CYP1A2 was identified, codon-optimized, cloned and expressed in E. coli BL21 cells. Multiple sequence alignments of equine CYP1A2 revealed an amino acid sequence identity of 83.69% to its human homolog which has previously been expressed in E. coli. The enzyme was expressed using both auto-induction and IPTG induction. Expressed equine CYP1A2 had a size of about 55 kDa, and was insoluble after cell lysis. Sarkosyl- solubilized CYP1A2 was purified using nickel affinity chromatography and gel filtration. For activity reconstitution, yeast NADPH-cytochrome P450 reductase was first expressed in E. coli BL21 cells and exhibited activity of 0.13 U/ml. Activity assay with Glo-P450 CYP1A2 assay kit indicated that CYP1A2 was inactive. Despite numerous attempts to obtain the activity, the CYP1A2 remained inactive. Although expression of equine CYP1A2 in E. coli produced non- catalytically active enzyme, this study could be used as the first step in an effort to fully develop a recombinant equine CYP1A2 system.
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- Date Issued: 2017
Monolingualism and its meaning in two KwaZulu-Natal high schools
- Authors: Carlyle, Jacqui
- Date: 2017
- Subjects: Monolingualism -- South Africa , Monolingualism -- South Africa -- Case studies , Language awareness -- South Africa , Language and education -- South Africa , School children -- South Africa -- Attitudes , School children -- South Africa -- Attitudes -- Case studies , African languages -- Study and teaching -- South Africa -- Attitudes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/6543 , vital:21135
- Description: This study reports on the identity and attitudes of monolingual English speakers (MES) at two high schools in Durban, South Africa, in relation particularly to the role and meaning of monolingualism. Two bodies of data are used to investigate the attitudes of MES and are oriented towards four variables: English, African languages (particularly Zulu), monolingualism and plurilingualism. The attitudes to these variables reveal the impact on identity of language usage in Durban, and negotiations of the participants in trying to mitigate or justify attitudes that are counter to the embracing of diversity encouraged in modern South Africa. First, an attitude questionnaire provides quantitative data that is subjected to analysis, including a chi-squared test. Second, a narrative elicitation interview provides qualitative narrative data that is analysed in relation to APPRAISAL theory. Both analysis types are used to ascertain the presence of a monolingual mindset in the scholars’ responses, as well as to capture the ideological forces to which they are subjected as monolingual English speakers in the unique multilingual setting of Durban. In essence, the data points to a discourse of compromise and unease on the part of the participants - as they juggle with the effects of an English-centric monolingual mindset, and a more pervasive pluralism that embraces the Rainbowism of ‘the new South Africa’. This discourse of compromise is characterized on one side by insecurity and dissatisfaction with the language in education policy, and well as the monolingual upbringing of MES in Durban, and a lack of Language other than English (LOTE), in particular, Zulu. This side of the compromise also portrays a pro- plurilingual orientation, a positive valuation of knowing a LOTE and of plurilingual people. Here, however, the manifestation of the ‘other side’ of the compromise appears as the MES characterize plurilingualism as exceptional and too difficult, and language learning at school as having a negative impact on academic success. Alongside this is a normalization of English and othering of African languages in practical situation. English is also promoted as the language of unity and economic and academic progress or success, while the material value of African languages is questioned.
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- Date Issued: 2017