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Statistical analysis of hydrogeochemical data from fractured rock aquifers around Beaufort West, South Africa
Get PDFKnowledge surrounding the procedures and protocols related to groundwater sampling are currently limited. In particular, the sampling of radioactive elements from fractured rock aquifers is poorly understood and in need of further research. The aim of this study is to provide a comparative insight into groundwater sampling methods used for the sampling of major and minor elements as well as trace elements within fractured rock aquifers in the immediate vicinity of Beaufort West. The influence of sampling source, seasonality, and vertical flows on sample results are observed. Furthermore, the importance of historical datasets is raised. Aims of this study were achieved by making use of historical data from numerous studies that were conducted near the Karoo town of Beaufort West. Potential profitable uranium deposits saw a great influx of research into the geology, topography, climate and hydrogeology. Synthesising data from these historical research papers has provided valuable information regarding the influences of sampling procedures on the results. A total of 695 well data samples were analysed from four studies collected from farms around Beaufort West. The importance of adequately purging a well prior to sampling cannot be stressed enough. There are minimal chemical differences between sampling boreholes and wind pumps, however there was a noticeable difference in the inter-relationships between major chemical elements. Groundwater samplers were found to be contaminated with Zinc and Copper attributed to wind pump fittings. Boreholes were also analysed to observe any changes in depth. Sodium, temperature and uranium had little to no changes with depth due to the homogenous nature of the borehole water. Principal component analysis was conducted on 159 groundwater samples comprised of 13 variables. These samples were reduced to four principal components (PC) which explained a total of 91.09% of the total variance. Factor one explained 61.99% of the total variance and was strongly associated with water-type and lithology while factor two (13.57%) shows the potential relationship between molybdenum and uranium as well as possible copper contamination as a result of wind pump and borehole fittings. Further research should be conducted by carrying out multiple sampling procedures on a selection of controlled wells to determine the best applicable sampling procedures.Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 202
An exploration of Black women’s motivations for pursuing sociology at Rhodes University
Get PDFEnbargoed. Expected release date 2025.Thesis (MA) -- Faculty of Humanities, Sociology, 202
Quantifying the training demands of an amateur women’s Rugby union team using Global Positioning System
Get PDFRugby union is a dynamic sport that has grown to not only be played by men but by women too. The professionalisation of the sport that happened in 1995 developed the game immeasurably including the focus given to its scientific research. This is important as literature on the demands of the game has become vital in improving the performance of Rugby union players (Deutch et al., 1998; Kay and Gill, 2004; Kruger, 2012). Scientific evidence-based data on the physical and physiological demands is imperative in the planning and setting up of training regimes (Deutch et al., 1998; Kay and Gill, 2004; Kruger, 2012). Unfortunately, the growth in the participation of women’s Rugby union has not been matched with scientific evidence-based literature that seeks to improve the performance of this population of players. Therefore, due to the unavailability of match-play during the COVID-19 outbreak, this study aimed to quantify the physical and physiological demands of training sessions of amateur women’s Rugby union players from the Sarah Baartman District, South Africa using Global Positioning System (GPS). The training’ data collected was compared to previous literature, including studies that also focused on match-play. Furthermore, players were categorized into forwards and backs, allowing for the comparison between the two playing categories. An exploratory, descriptive, observational, and comparative research design was used for the current study. The physical and physiological demands of eighteen women Rugby union players (eight forwards and ten backs) aged between 18 – 36 years old were assessed during training (for a total of nine sessions). To inform the participants’ characteristics, the players’ demographic, and anthropometric characteristics (age, stature, and body mass) were obtained. Using GPS and Zephyr technology the players’ training physical (time spent in speed zones, maximum speed, total distance travelled, number of impacts in the various impact zones) and physiological (heart rate) demands were explored. Statistical analysis methods including descriptive, independent t-test, one-way and two-way ANOVA tests were employed to analyse the data and evaluate the differences between forwards and backs. The mean age and stature for all players was 25,44±5,6 years and 1,60±0,06 m respectively, with no significant differences found between backs and forwards. With regards to body mass, forwards weighed 82,0±9,4 kg while backs weighed significantly lighter at 58,0±5,8 kg. Significant differences (p < 0,05) were found for all players in the time spent in speed zones and the number of impacts in impact zones. When all forwards’ and backs’ physical and physiological demands were compared the results showed no significant differences. The average time spent in all six speed zones combined was 11,41 and 11,62 mins for forwards and backs, respectively. The maximum speeds reached by forwards (21,35±5,72 km/h) and backs (22,85±3,88 km/h) were similar. All players combined travelled an average total distance of 2,14±0,76 km. The total number of impacts in all six impact zones, totalled 116 impacts for forwards and 97 for backs. Heart rate responses recorded for forwards and backs were 139±15 bpm and 134±13 bpm. Based on the findings of this study, the training intensity of amateur women’s Rugby union was lower than the demands experienced in the training and match-play of previous research. It was also observed that there was no specificity with regards to the training programs allocated between forwards and backs of this study. Further research on amateur women’s Rugby union is required to characterise training and match-play demands of these players.Thesis (MSc) -- Faculty of Science, Human Kinetics and Ergonomics, 202
A statistical study of travelling ionospheric disturbances over the African-European and American sectors
Get PDFThis research presents a long-term statistical study of travelling ionospheric disturbances (TIDs) of low- and high-latitude origin over the American and African-European sectors between 2010 and 2018. The TIDs of low latitude origin (hereafter known as poleward TIDs) were studied in both quiet and disturbed conditions, whereas the equatorward TIDs were only studied during quiet conditions. The Kp > 4 and Dst_ -50 nT was used as a criterion for geomagnetic disturbed conditions, while the four geomagnetically quiet days were selected each month based on Kp < 3. Observations of TIDs are made using Global Navigational Satellite Systems (GNSS) total electron content derived data. During quiet conditions, seven and two transhemispheric TIDs were identified over the African-European and American sectors, respectively. The observed TIDs originated from the wintertime hemisphere and propagated into the summertime hemisphere. The horizontal velocity, periods, and horizontal wavelengths of TIDs are in range of cH = 120-274 m/s, 48-80 min and _H = 379-1104 km, respectively. These quiet-time equatorward TIDs have been associated with tertiary gravity waves (GWs) from the dissipation of secondary GWs which are in turn generated from the dissipation of mountain waves (MWs) as a result of excited orographic forcing. The poleward TIDs during geomagnetically quiet conditions over the African and American sectors occur mainly during local daytime. Poleward TIDs were observed mostly in the African-European sector than the American sector. Their horizontal propagation velocities and periods range between 129-280 m/s and 39-70 min over African-European and American sectors. Although the mechanisms responsible for launching quiet-time poleward TIDs have not been established in this study, lower atmospheric processes such as convection systems, sudden stratospheric warming and cold weather fronts may have a role in their generation. During geomagnetic storms in the African sector, almost all poleward TIDs (with the exception of two cases) during the main phase were large-scale with horizontal velocities and periods ranging from 250-503 m/s and 30 min to 2 hours. During recovery phase, poleward TIDs fall under the category of medium scale. In the American sector, the majority of poleward TIDs occurred during the storm's main phase, as opposed to the African-European sector, which experienced a significant number of poleward TIDs during the recovery phase. The periods and horizontal velocities of TIDs range from 45 min-1.5 h and 180-296 m/s during main phase. During the recovery phase, the horizontal velocity and period range from 177-271 m/s and 40-1.5 h, respectively. Overall, it has been shown that statistically, changes in equatorial electrodynamics related to enhanced eastward electric _eld and hence increased equatorial electrojet (vertical E_B drift) correlates highly with the reported poleward TIDs.Thesis (PhD) -- Faculty of Science, Physics and Electronics, 202
Economically important cephalopods of southern Angola, with a focus on the artisanal jig fishery
Get PDFThe global decline in marine finfish stocks has been met with a concomitant expansion of fisheries for cephalopods. Despite the increase in the exploitation and commercialization of cephalopods, there is a dearth of scientific information for over 90% of the extant species and this is even more marked in the developing world. Angolan capture fisheries production noted a tenfold increase in cephalopod landings between 1994 and 2003. One of the important fisheries is a cephalopod directed jig fishery that targets the squid Loligo reynaudii and the cuttlefish Sepia vermiculata in southern Angola, however, there is a complete lack of socio-ecological information available for this fishery. Hence the aim of this thesis was to provide basic biological and demographic information on L. reynaudii and S. vermiculata distributed off the coast of southern Angola, assess the importance and dependence of local artisanal fishers on these two species and examine the current management strategies and policies in the region This study found that the artisanal cephalopod jig fishery is critical for the livelihoods of the coastal communities of southern Angola, particularly due to the limited alternative income generating opportunities available. The cephalopod jig fishery is highly labour intensive, with fishers spending a considerable amount of time per day, drifting over known fishing grounds. Catch composition of the artisanal jig fishery indicated that squid is the dominant species within the fishery, in terms of numerical abundance and weight. The productivity and progression of the fishery is hampered by a number of ecological, socio-economic and governance constraints, as highlighted by socio-economic surveys conducted with local squid fishers. Such constraints include, but are not limited to declining catches, increased negative interactions with seals, increased inter-sector competition, lack of infrastructure, poor quality fishing equipment as well as a lack of communication and support from government officials. To examine aspects of the biology and demography of L. reynaudii, whole specimens were collected monthly, from the two primary fishing areas in southern Angola; Namibe and Tombua, during two main sampling periods, June 2008 – May 2009 (Period 1) and June 2014 – May 2015 (Period 2). Male L. reynaudii were found to be significantly larger in size and weight than females, however both the average and maximum dorsal mantle length (DML) decreased between sampling periods. Length-at-50% maturity was larger for male L. reynaudii (170.47 mm DML – 1st period, 165.44 mm DML – 2nd period) than female L. reynaudii (114.71 mm DML – 1st period, 109.43 mm DML – 2nd period). Gonadosomatic indices (GSI) varied significantly during month and season for both sexes. Peak GSI coincided with a low catches in the artisanal jig fishery suggesting that the population may undergo a spawning migration away from fishing grounds, during late spring and summer. The theory of a seasonal spawning migration is further supported in this study by the low abundance of juvenile and sub-adult L, reynaudii collected during the study, along with the inability to detect egg beds in known fishing grounds. Stomach content analysis indicated that teleosts were the most important dietary item (66.3% F of the stomach contents). Trachurus capensis and Engraulis encrasicolus are both highly abundant small pelagic fishes in the cold nutrient rich waters of the Benguela Current and dominated the diet of sampled squid during autumn and winter months. It is likely that the prevalence of large, adult squid off the coast of Angola, as observed within the current study, may be ascribed to the suitable environmental conditions and the abundance of suitable prey. The results from the current study indicate that the southern Angolan subpopulation reveals similarities to that of the West Coast subpopulation of squid in South Africa, with regards to demographics and reproductive characteristics. It is likely that the population in southern Angola is an extension of the South African subpopulation of L. reynaudii on the western extremities. To examine the basic population biology and ecology of S. vermiculata off southern Angola whole specimens were collected from the fishery between December 2014 and April 2015. Morphological results indicate clear sexual dimorphism in soft part characteristics, cuttlebone and beak morphometry. Length-at-50% maturity was smaller in male S. vermiculata (217.53 mm DML) than female S. vermiculata (231.13 mm DML), although these differences were not significant. Stomach content analysis indicated that S. vermiculata predominantly fed on teleost species which were found within 64.5% of stomachs. Teleosts were more dominant in the diet of male S. vermiculata (78.6% F) than female S. vermiculata (53.0% F), which ate a more varied diet including crustaceans (41.2% F) and cephalopods (17.7% F). Availability and abundance of cuttlefish in Namibe indicates that the species may undergo a spatio-temporal shift in distribution, with majority of the artisanal catches of S. vermiculata occurring during summer months. The results from the current study highlights the fisheries potential of L. reynaudii and S. vermiculata and the dependence of artisanal fishers in southern Angola on cephalopods, and more specifically squid. The development of sustainable fisheries management strategies for the artisanal cephalopod jig fishery is critical, particularly as the global exploitation of cephalopods continues to increase with declining finfish populations. Failure to implement management strategies may remove this critical economic safety net for vulnerable coastal communities which have little alternative livelihood opportunities. Ongoing ecological research, a co-management approach and an increased consideration of local ecological knowledge will assist in designing appropriate management plans for the southern Angolan cephalopod jig fishery.Thesis (PhD) -- Faculty of Science, Ichthyology and Fisheries Science, 202
An analysis of integrated reporting on the governance of selected State-Owned Enterprises (SOEs)
Get PDFThe research investigated how integrated annual reports (IARs) can enhance the governance of state-owned enterprises (SOEs). Governance of SOEs is crucial to achieving the county’s socio-economic objectives. The SOEs listed on Schedule 2 of the Performance Finance Management Act (PFMA), Act No. No.1 of 1999, as amended in March 2017, represents, among many, the electricity, transportation, and telecommunication sectors. This study analysed the integrated reporting (IR) governance of selected schedule 2 of PFMA SOEs. The researcher adopted the qualitative approach for the study. Firstly, the analysis was to identify and describe the governance disclosures as evident in IARs using the King IV principles. Secondly, the study analysed the reporting trends associated with governance practices over 2018 – 2020. Integrated reports from Eskom, Transnet, and Telkom were selected for three years. Relevant concepts discussed in the literature review include corporate governance, King reports on corporate governance, King IV principles, the principle of materiality on governance disclosures, corporate reporting, integrated reporting, integrated thinking, benefits of integrated reporting, theoretical underpinnings of the study, and a conclusion. The disclosures were summarised per year and SOE per King IV principle, resulting in nine (9) excel spreadsheets, which were combined excel spreadsheets sorted into a logical structure based on coding to keep track of the source data sequence. The data was systematically manually coded using Ose's (2016) Microsoft Word and Excel method. Findings included seven themes which were ethics, irregular expenditure, internal controls, accountability, governance structures, reputation, and sustainability. Themes were transferred to subtopics for comparative analysis to assess trends and the SOEs’ governance disclosures. The results found that all three SOEs have disclosed using King IV principles guided by the 2013 International Integrated Reporting Council’s (IIRC) framework. All SOEs disclosed their governance in their reports and practice explained. There are noticeable differences, Eskom and Transnet are solely government-owned, and Telkom is partially privatised and run privately as the majority holding is mostly private. Eskom and Transnet reflected more similarities in terms of their operational and financial challenges, whereas Telkom operates in a more competitive environment and is run as a private company which is portrayed to be profitable and restricted to Johannesburg Stock Exchange (JSE) requirements. Disclosures indicate progress on material matters and links associated with functional areas such as strategy and risks. Materiality is a guiding principle in the IIRC framework, which assist discloses information that significantly affects the organisation’s ability to create value over time. The similarities in all three SOEs include challenges in retaining competent and ethical leaders, which is critical for enhancing good governance. The study recommended how the integrated report can be viewed as a management and accounting tool for the governing body and stakeholders to focus on drivers that create value and consider drivers that erode or preserve value. This feedback may assist in informing strategy, business model, and decision-making for the governing body to set governing structures that support the organisation to create sustained value.Thesis (MBA) -- Faculty of Commerce, Rhodes Business School, 202
The proprietary consequences of foreign marriages for the purposes of estate planning and succession in South Africa
Get PDFThis thesis is intended to provide clarity regarding the proprietary consequences of foreign marriages in the context of estate planning and succession in South Africa. It includes an exploration into the impact of specific legislation on foreign marriages, the implications of matrimonial property regimes on a deceased estate in South Africa, private international law principles affecting matrimonial property and succession claims, the scope of antenuptial contracts and postnuptial contracts as existing remedies for foreign remedies, and the harmonisation of succession and matrimonial property law in the European Union (EU). It furthermore suggests potential reforms for the overhaul of the lex domicilii matrimonii principle and associated issues arising therefrom. Various specific issues discussed include the waiver of accrual claims, maintenance claims by surviving spouses of a foreign marriage, choice-of-law rules for matrimonial property rights and succession rights, the registration of a domestic or foreign antenuptial contract for foreign marriages, the formal validity and proper law of antenuptial contracts, the operation of the immutability principle on a domestic and international level, and the common-law approach to the recognition of postnuptial contracts and spousal donations.Thesis (LLM) -- Faculty of Law, Law, 202
Inkciyo yengwemesha
No full textA genital girdle with brass washers in which the bead apron is supported at the back by two rows of very small brass washers strung on plaited cloth threads, worn by a girl of 12 or more years, It is part of Walter Sisulu University Beadwork Collection that was acquired from Mrs Broster in 1992.Purchased from Mrs Joan BrosterForms part of: Walter Sisulu University Beadwork Collectio
Development of a translation device for axiological-semantic density in political news articles: Wording and charging
Get PDFThe concept of axiological-semantic density from Legitimation Code Theory (LCT) is extremely helpful in analysing political knowledge-building, as it describes the strength of relations between various people, political stances and moral judgements, enabling these to be positioned in relation to each other. We present a multi-level translation device designed to identify strengths of axiological-semantic density in political news articles from the Daily Sun, South Africa’s most popular tabloid newspaper. This translation device was devised through analysis of selected texts from a corpus of 516 articles published between January and June 2015. It was developed through a collaborative process involving the first author and a team of student research assistants. The final translation device has five tools, of which two, the wording and charging tools, are described in this article, and then illustrated using an example analysis of a Daily Sun political news article. Both tools reveal insights into South African political discourses and ways in which axiological-semantic density can be enacted in future research. Making axiological-semantic density visible using such a translation device also has practical applications in assisting readers to understand the ways in which publications such as the Daily Sun position political parties, enabling them to engage more constructively in discussions on the country’s future
Marine spatial planning by the state as trustee of coastal public property
Get PDFThe world is facing an unprecedented biodiversity crisis, endangering human wellbeing, human rights, and the future of life on Earth. This is because the state of the ocean is deteriorating due to increased human activities, which have resulted in the destruction of limited marine resources in terms of space, time, and quantity. Marine spatial planning (MSP) and the public trust doctrine are two concepts that have been proposed to address this ecological crisis. The relatively new notion of MSP has emerged as a comprehensive way to allocate ocean use in space and time to improve coordination and deliver a more sustainable use of the ocean space. While different States have utilised the public trust doctrine to manage trust resources for the exclusive benefit of their current and future citizens. The thesis examines the MSP process and the public trust doctrine in international law to determine international obligations that can be relied on to ensure State compliance at a domestic level. It was determined that MSP and the public trust doctrine are only implicit in certain international law instruments. The thesis further sets out to examine whether both approaches must be explicitly mentioned in binding international law instruments. The thesis is expected to determine whether the South African environmental law regime includes the public trust doctrine – expressly or impliedly. The public trust doctrine is not expressly provided for in the Constitution since section 24 contains an implicit duty. The implicit duty is a constitutional human rights imperative applicable to all environmental management statutes. The picture in South Africa’s environmental legislation differs because the public trust doctrine is expressly mentioned, albeit in different terminology in several environmental law statutes dealing with specific natural resources. However, the legislature failed to include an express public trust provision in the Marine Spatial Planning Act (MSPA). 1 The thesis then embarks on a journey of statutory interpretation. It examines the applicable canons of interpretation to determine whether the MSPA supports or contradicts the public trust doctrine. An implicit public trust duty was found in the MSPA. This exercise also led to the conclusion that the trusteeship clause in National Environmental Management: Integrated Coastal Management Act (NEM: ICMA) also applies in the same geographical area as the MSP Act. Moreover, there is no provision in NEM: ICMA requiring its provisions to be applied or read in accordance with MSP regulation. However, a thorough examination of the NEM: ICMA and MSPA provisions leads to the conclusion that there will be no conflict if both instruments are read together. The most significant finding of this thesis is that, due to the provisions of both statutes, the State, a trustee in NEM: ICMA, is also a trustee in the MSPA. Finally, the combination of MSP and the public trust doctrine in MSP regulation may have several positive impacts, which include useful intervention for the existential crisis that underpins South Africa’s maritime domain and the promotion of sustainable development of the ocean space for both current and future generations. MSP and the public trust doctrine should be used in tandem to ensure that the ocean space is developed sustainably for current and future generations. This thesis demonstrated that the ultimate impact of the State’s implementation of MSP on the relevant State actors is that they must constantly remind themselves of the full implications of their role as trustees of coastal public property to avoid violating their public trust duties.Thesis (LLD) -- Faculty of Law, School of School of Public Law, 202