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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
181

Estimation of suspended sediment yield flowing into Inanda Dam using genetic programming

Jaiyeola, Adesoji Tunbosun January 2016 (has links)
Submitted in fulfilment of the requirements of the degree of Master of Engineering , Durban University of Technology, Durban, South Africa, 2016. / Reservoirs are designed to specific volume called the dead storage to be able to withstand the quantity of particles in the rivers flowing into it during its design period called its economic life. Therefore, accurate calculation of the quantities of sediment being transported is of great significance in environment engineering, hydroelectric equipment longevity, river aesthetics, pollution and channel navigability. In this study different input combination of monthly upstream suspended sediment concentration and upstream flow dataset for Inanda Dam for 15 years was used to develop a model for each month of the year. The predictive abilities of each of the developed model to predict the quantity of suspended sediment flowing into Inanda Dam were also compared with those of the corresponding developed Sediment Rating Curves using two evaluation criteria - Determination of Coefficient (R2) and Root-Mean-Square Error (RMSE). The results from this study show that a genetic programming approach can be used to accurately predict the relationship between the streamflow and the suspended sediment load flowing into Inanda Dam. The twelve developed monthly genetic programming (GP) models produced a significantly low difference when the observed suspended sediment load was compared with the predicted suspended sediment load. The average R2 values and RMS error for the twelve developed models were 0.9996 and 0.3566 respectively during the validation phase. The Genetic Programming models were also able to replicate extreme hydrological events like predicting low and high suspended sediment load flowing into the dam. Moreover, the study also produced accurate sediment rating curve models with low RMSE values of between 0.3971 and 11.8852 and high R2 values of between 0.9833 and 0.9962. This shows that sediment rating curves can be used to predict historical missing data of the quantity of suspended sediment flowing into Inanda Dam using existing streamflow datasets. The results from this study further show that the predictions from the Genetic Programming models are better than the predictions from the Sediment Raring Curve models, especially in predicting large quantities of suspended sediment load during high streamflow such as during flood events. This proves that Genetic Programming technique is a better predictive tool than Sediment Raring Curve technique. In conclusion, the results from this study are very promising and support the use of Genetic Programming in predicting the nonlinear and complex relationship between suspended sediment load and streamflow at the inlet of Inanda Dam in KwaZulu-Natal. This will help planners and managers of the dam to understand the system better in terms of its problems and to find alternative ways to address them.
182

Implementation of the basic antenatal care approach : a tailored practice framework for eThekwini district, KwaZulu-Natal

Ngxongo, Thembelihle Sylvia Patience January 2016 (has links)
submitted in fulfillment of the requirements for the Doctoral Degree in Nursing, faculty of Health Sciences, Durban University of Technology, Durban, South Africa, 2016. / Globally antenatal care is advocated as the cornerstone for reducing children’s deaths and improving maternal health. The World Health Organization designed and tested a Focussed Antenatal Care model for the developing countries to improve their quality of antenatal care services. South Africa has not successfully implemented this approach, referred to by South Africa as the Basic Antenatal Care approach. A convergent parallel mixed methods design was used to assess how the Basic Antenatal Care approach was implemented in the eThekwini district. Data were collected from 12 Primary Health Care clinics using observations, retrospective record reviews and semi-structured interviews conducted with pregnant women. The quantitative data was analysed using version 21.0 of the Statistical Package of Social Services and qualitative data was analysed using Tech’s method of data analysis. The Basic Antenatal Care approach was not being successfully implemented in the Primary Health Care clinics. Several aspects of planning, people, processes and performance were not done according to the Basic Antenatal Care Principles of Good Care and Guidelines. Although good communication was observed between the clinic staff members and the referral institutions, communication problems existed between the Primary Health Care clinics and the Emergency Medical Rescue Services and also with the pregnant women. Antenatal care and delivery plans and the midwives’ counter checking of maternity charts were not recorded. Some pregnant women had positive perceptions about the antenatal care services but others had negative perceptions. Recommendations pertaining to institutional management and practice, nursing education and research were made. A tailored practice framework and an implementation guide were developed based on setting and client-specific factors to facilitate the implementation of the Basic Antenatal Care approach. The framework highlights the importance of cooperation between management and administration, in-service education and skills development departments/units and the operational level. Effective implementation of the Basic Antenatal Care approach could help to reduce South Africa’s high maternal and neonatal mortality rates. Thus the tailored practice framework and implementation guide, developed as part of this study, could help to improve maternal and neonatal health-related outcomes in South Africa. / D
183

Estimating pedestrian accident risk using conflict techniques and digital imaging.

Dookhi, Revash. January 2003 (has links)
Accidents are a complex process involving many contributory factors. The understanding of the accident process has often been sought by the use of accident data. Although accident data provide a direct relationship to estimating accident risk, there are many drawbacks associated with the use of these data. The major drawback with the use of accident data is the very fact that traffic engineers have to wait for accidents to occur before any interventions can be made. This alone is significant as the time span required to collect a sample size is often a three-year period. The many deficiencies with accident data have led to alternative measures such as traffic conflict techniques (TCT's) to estimate accident risk.In this investigation. traffic conflict techniques were used to estimate accident risk. There are four basic traffic conflict concepts and the development of these techniques was based on the accident process. The aim of this investigation was to highlight the differences between these concepts and to assess the applicability of these concepts to vehicle-pedestrian conflicts. The investigation was based on applying the various conflict techniques to data obtained at three intersections in the Durban CBD. In order to record the data an innovative method of using digital imaging was employed. This led to the development of a computer program to analyse conflict events. Analysis of the intersections based on the conflict techniques indicates that the intersections of Pine-Field and Commercial-Grey have a high probability of road users being involved in a "serious event" once there is an interaction between them. However, the probability for Commercial-Albert intersection is low thus indicating a safe intersection for vehicle-pedestrian interactions. The number of "serious events" at these locations was found to be related to the interacting traffic volumes - the conflict rate increases with increasing traffic volume. The use of conflict-volume models and accident models together with the conflict concepts agree that the accident risk is related to the conflicting traffic volumes and speed of the road users. / Thesis (M.Sc.Eng.)-University of Natal, Durban, 2003.
184

An investigation of a waste minimisation club for the metal finishing industry.

Thambiran, Namo. January 2002 (has links)
Take care how you place your moccasins upon the earth, step with care, for the faces of the future generations are looking upfrom the earth waitingfor their turnfor life - Lyoru, 1988 Increasing levels of pollution and the increase in demand for water and other resources by industry led to a number of policies and regulations being developed and revised in South Africa. According to the Constitution of the Republic of South Africa (Act 108 of 1996), everyone has the right to an environment that is not harmful to health or wellbeing. In order to have the environment protected and sustained for future use, it became necessary to move away from the traditional fragmented approach to pollution and waste management and focus on an integrated strategy aimed at achieving a balance between ecological sustainability and socioeconomic development. In the Durban Metropolitan Area (DMA) , the Durban Metropolitan Council (Metro) incorporated pollution prevention in their bylaws, which contained stringent discharge limits for heavy metal concentrations. This posed a potential problem for metal fmishers who were concerned about complying with these discharge standards. In addition, the metal finishing industry was considered to be a significant contributor to the pollution load in the DMA, and therefore needed to find suitable solutions to dealing with environmental problems, especially waste management. Waste minimisation was believed to be a good tool for this industry to utilise in order to reduce its pollution load. It was seen from the literature and case studies from international initiatives that waste minimisation results in an improvement in process efficiency and reductions in production costs and environmental impacts, generally at minimal costs. A waste minimisation club was initiated for the metal finishing industry in the DMA in June 1998. The club consisted of twenty-nine members of which the majority were small and medium sized companies. The club was run over a period of thirty months. A core group of sixteen companies actively participated in the activities of the club. During the period of investigation, a total of 391 waste minimisation options were identified for club members and 147 of these options were implemented. This resulted in a total financial saving in excess of R 4 million for the duration of the club's existence. The saving represents combined savings in water, chemicals, metals, energy, effluent treatment, and waste disposal. Corresponding environmental benefits were achieved including a reduced demand for water, reduced toxicity of effluent from chemical and metal reduction, and a reduction in energy requirements. Four companies were investigated in detail and presented as case studies. These companies showed that the payback on implementing waste minimisation options was mostly immediate. The size of the companies was not critical in determining the level of success from running waste minimisation programmes. Success depended mainly on commitment from companies and motivation of project champions. It was found that the greatest barriers to implementing waste minimisation, as identified by companies, were a lack of time, resources, and commitment. Companies joined the club mainly for benefit of reducing costs and complying with legal standards. Aside from successfully raising awareness and promoting the concept of waste minimisation, the waste minimisation club also resulted in an improvement in the relationship between the metal finishing industry and the Metro, and among club members. Based on the results achieved by club members, and from managing the club, it was evident that the club was effective in promoting waste minimisation in industry. For the future running of clubs, it is recommended that waste minimisation assessment training be given to all employees of a company. It would also be more useful if companies reported savings on a more regular basis and more formally. In addition it is recommended that club membership should be limited to between ten and fifteen companies to facilitate improved management of the club. / Thesis (M.Sc.Eng.)-University of Natal,Durban, 2002.
185

Fear of crime, social cohesion and home security systems in post-apartheid South Africa : a case study of ward 33, Durban.

Vahed, Yasmeen. 22 September 2014 (has links)
This study investigates the causes of fear of crime amongst residents of Ward 33 in KwaZulu-Natal, and the impact of this fear on their behaviour; the relationship between social cohesion and fear of crime; how residents are trying to make themselves safer in their own homes; and whether these measures are indeed producing feelings of greater safety and security. The research methodology employed for this dissertation is mainly qualitative, in particular the use of storytelling and photographs, which were used as a “canopener” to get respondents to discuss their security choices as well as the choices made by others. The findings indicate that the sources and extent of fear of crime vary amongst residents. Fear of crime emanates from the physical and social environment as well as the kinds of information shared within communities. Embedded within the narratives is a strong association of race with crime, which is deepening divisions in the ward. The findings also question whether greater heterogeneity automatically reduces social cohesion. As far as home security is concerned, the northern part of the ward is generally more affluent and this is reflected in the more diverse security measures adopted by residents. In discussing the principles of Crime Prevention Through Environmental Design (CPTED), which is based on the idea that crimes are less likely to occur when properties are visible, residents’ attitudes tended to vary according to their respective fear of crime, their financial status, and specific location within the ward. A theme running consistently through the literature and in some of the narratives is the effect of geography on how residents and potential criminals view an area. The regeneration of some parts of the ward and neglect of others shows the differential outcomes when local community members choose whether or not to be proactive and participate in such projects. / Thesis (M.A.)-University of KwaZulu-Natal, Durban, 2013.
186

An assessment of the capacity of waterfront developments to adapt to climate change : a case study of the Point Waterfront Area, Durban.

Sogoni, Zukisa. 22 September 2014 (has links)
This research set out to investigate the resilience of the Point Waterfront Development in Durban, South Africa, with regards to climate change. Considering that South Africa is a Third World country, the assumption was that Point Waterfront area would fall short of resilience when it comes to climate change. This research made use of primary and secondary data from the Point Waterfront case study. Primary data were obtained through semi-structured interviews with key stakeholders of the Waterfront development. These are The eThekwini Municipality Planning and Economic Development units, Laurusco Developments, Durban Point Development Company and the local Ward Committee and Councilor. Secondary data were obtained through recent publications in the form of municipal reports, newspapers, internet articles, and books had the relevant data on the resilience of Waterfront developments to climate change. Findings suggest that the Point Waterfront is relatively safe unless something of very extreme nature comes along in terms of sea level rise from the Indian Ocean. All the stakeholders are aware of what climate change might do to the development but the municipality is, the findings suggest, the only stakeholder that goes an extra mile as to improve the resilience of the Point Waterfront and of the city of Durban at large. There seems to be some irregularities when it comes to funds as the municipality does not have enough to tackle adaptation on its own. As a recommendation, waterfront developments should be approved only aftermeasures that enable them to be resilient to climate change have been put in place.Developers must ensure efforts to mainstream the issue of climate change adaptation. Policies should be put in place to formalize adaptation among residents. An example would be instituting a policy requiring every property to have a green roof. / Thesis (M.T.R.P.)-University of KwaZulu-Natal, Durban, 2013.
187

Access and utilisation of antenatal care services in a rural community of eThekwini District in KwaZulu-Natal

Bhengu, Thandeka Jacqueline January 2016 (has links)
Dissertation submitted in compliance with the requirements for the Masters Degree in Technology: Nursing, Durban University of Technology, 2016. / Introduction Although the South African Government adopted a primary health care approach to health care service provision in order to ensure equitable access to and utilization of health care services to all communities, the country continues to face challenges regarding access and utilisation of health care services especially in the rural communities. Antenatal care which is mostly provided at primary health care level is regarded as the cornerstone for the success of the maternal and child health care programme. Therefore, poor access to and under-utilisation of health care services could potentially influence the success of this programme and pregnancy outcomes. Aim of the study The aim of the study was to determine whether pregnant women from KwaMkhizwana rural community had access to and were utilising antenatal care services. Methodology A qualitative, exploratory, descriptive and contextual study was conducted guided by Thaddeus and Maine’s three delays model. Purposive sampling of the pregnant women and all categories of nurses who were employed in the three health care facilities in the area was done. Data was collected in two phases through in-depth semi-structured interviews with both the pregnant women and the nurses respectively between February and March 2016. The sample size was guided by data saturation. All data were analysed using the Tesch’s method of data analysis. Study findings Six major themes and several sub-themes emerged from the interviews with both Phase 1 and Phase 2 participants. The major themes included: 1) access to health care and emergency services, 2) availability of human and material resources, 3) social and cultural beliefs, 4) past pregnancy experiences, 5) communication and transparency regarding health care service delivery and 6) quality of antenatal care services. Summary of the findings The pregnant women encountered several challenges which led to delays in seeking, reaching and receiving antenatal care. Most of the pregnant women participants related limited access to health care, with under-utilisation of antenatal services. They were unhappy about the antenatal care services they received in the three available health care facilities in the area, which made these facilities to be inaccessible and underutilised. The nurse participants recognised the challenges facing the pregnant women regarding the access and utilisation of antenatal care services, together with the challenges faced by the nurses while working in the three available health care facilities in the area. Recommendations The recommendations that were made included: to consider building a centrally located fixed primary health care clinic that would ensure equal access to health care services, strengthening the implementation of policies regarding the referral system and ambulance services, ensuring sustainable availability of human and material resources, developing strategies to ensure that the antenatal care services are delivered in line with the South African Department of Health policies and guidelines and strengthening community education. A further study on provision of antenatal care services in the area is also recommended. / M
188

Performance of a horizontal roughing filtration system for the pretreatment of greywater

Mtsweni, Sphesihle January 2016 (has links)
Submitted in fulfillment for the requirements of the degree of Master of Engineering, Department of Chemical Engineering, Durban University of Technology, KwaZulu-Natal, South Africa, 2016. / A large fraction of the world's population, around 1.1 billion people, do not have access to acceptable sources of water. In South Africa there is a growing pressure on the available freshwater resources. New sources of freshwater supply are becoming increasingly scarce, expensive or politically controversial. This has led to large scale interest in the application of water reclamation and reuse of domestic, mining and industrial wastewater as an alternative water supply sources. This is becoming critical to sustain development and economic growth in the Southern African region. This research aims at providing both social and scientific information on the importance of greywater reuse and recycling as an alternate source to aid water demand management under South African conditions. The approach to this research work was divided into two main thrusts: the first was to gain an understanding of the public attitudes towards the idea of reusing greywater that is usually perceived as wastewater which pose health concerns. The second was to provide an understanding of typical greywater quality in a peri-urban community in Durban, South Africa as well as investigate the suitability of a horizontal roughing filtration system in reducing pollutant strength of contaminants found in greywater for non-potable reuse applications. In order to achieve the central aim of this research study, the following objectives were considered: • Investigation of public perception and attitudes towards the reuse of greywater. • Determination of greywater quality in a peri-urban community in Durban South Africa. • Investigation of the performance of a horizontal roughing filtration system for the treatment of greywater collected from a peri-urban community in Durban, South Africa. It was important to have an understanding of public perception and attitudes towards the reuse of greywater because of the fact that the success of any reuse application depends on the acceptance of the public. The methodological approach for this aspect of the research work involved administering of structured questionnaires to residents within the community through field visits. The questionnaire addressed issues related to attitudes towards the reuse of greywater, perceived advantages related to the reuse of greywater and concerns related to public health issues regarding the reuse of greywater. The successful implementation of any greywater treatment process depends largely on its characteristics in terms of the pollutant strength. The methodological approach for this aspect of the research work involved physico- chemical characterization of the greywater collected from different sources within the households in the peri-urban community. Greywater samples were collected from the kitchen, shower and laundry within each of the households. This aspect of the research work was undertaken to gain an understanding of greywater quality from different sources within and between households. In order to achieve the third objective of this research work, a pilot plant horizontal roughing filtration system was designed and fabricated for the treatment of greywater. The system consisted of three compartments containing different sizes of gravel that served as the filter media. This was done in order to investigate the effect of varying filter media size on the performance of the horizontal roughing filtration system in treating greywater. The system had an adjustable manual valve used in varying the filtration rate. The impact of varying filtration rate on the performance of the horizontal roughing filtration system in treating greywater was also investigated. The main findings of this research were: • From the survey conducted, the percentage of the public willing to accept the reuse of greywater within the community was far higher than the percentage opposing its reuse. Concerns have often been expressed by the public that the reuse of greywater could pose possible adverse effects to public health. However, in this pilot study it was found that a higher percentage of respondents (>60%) disagree that the reuse of greywater could negatively impact on public health compared to less than 20% of the respondents that agree. An interesting finding of this study was that a greater percentage of the respondents were willing to have a dual water distribution system installed in their current place of residence. • The physico-chemical characterization of greywater from different sources within the households investigated indicated that, the quality of greywater varies considerably between all sources and from household to household. None of the households investigated produced the same quality of greywater. It was also found that greywater generated from the kitchen contains the most significant pollutants in terms of the physico-chemical parameters considered in this study compared to the other sources within the household. • The pilot plant horizontal roughing filtration system demonstrated its suitability for the treatment of greywater for non-potable reuse applications. It was observed that 90% turbidity and 63% Chemical Oxygen Demand reduction was achieved over the entire duration of operation of the horizontal roughing filter. It was also observed that the removal efficiency was significantly higher in the compartment with the smallest filter media size and the removal efficiency was significantly higher at lower filtration rates. It is therefore concluded from the investigation conducted in this research that the role of the public is a vital component in the development and implementation of any reuse system / application. It was found that there was a relatively high level of acceptance for the reuse of greywater among the respondents within the community where the study was conducted. The greywater characteristics results obtained from this investigation indicated the necessity of treatment prior to disposal in the environment. Also, a low BOD5/COD ratio of 0.24, which is significantly lower than 0.5, is an indication that the greywater generated from the community cannot be easily treated using biological treatment processes and/or technologies. The pilot horizontal roughing filtration system used for the treatment of greywater in this study demonstrated its suitability for the treatment of greywater for non-potable reuse applications such as irrigation, toilet flushing and washing activities. / M
189

An urban-agricultural hub, Umngeni, Durban.

Maphumulo, Mfundo Archibald. January 2008 (has links)
Thesis (MTech. degree in Architecture: Professional)--Tshwane University of Technology, 2008. / The aim of this dissertation is to design an urban-agricultural building to facilitate small scale intensive farming on the edge of the city of Durban. The buildings assume the typology of a vertical farm which has been named the 'ZED' farm, 'ZED' being dichotomous. Firstly the term has been borrowed from Bill Dunster Architects who coined the acronym 'ZED' (Zero Energy Development), which is one of the project's inherent objectives. The second meaning of 'ZED' is a translation of the building's main programmatic function of production in the vertical Z-axis. The site is located on the interface of the metropolitan edge, in an area bustling with activity ranging from industry, trade, recreation, public transportation, and a residential component. This area is flanked by the Umgeni Road corridor and the Suncoast Casino lifestyle entertainment centre along the beachfront.
190

Female employees' perceptions of work-life balance at a banking institution in the Durban region.

Singh, Ashlesha. January 2013 (has links)
This study was interested in female bank employees’ perceptions of work life balance at a banking institution in the Durban region. The Job Demands-Resources (JD-R) Model was used as a theoretical framework to consider the demands that these women encounter as well as the support systems that they utilise to help facilitate work-life balance (WLB). Importantly, as a theoretical framework, the JD-R was used to bring to light employee experiences of their WLB in relation to their work demands and the resources that are available to them. A qualitative research design was used. Semi-structured interviews on a purposive sample of eight research participants were conducted within the sales and credit division at a large banking institution in the Durban region. Theory-led thematic analysis was used to analyse the interview transcripts. The findings of the study indicated that these women relied heavily upon domestic helpers in terms of household duties, extended family and their spouses in terms of childcare duties and needs. These employees felt that work dominates their lives more due to the core demands of meeting targets within the sales and credit divisions. These employees perceived that the bank as a whole was not supportive of WLB as they claimed to be and wanted to be involved with the HR Department in the formation of work-life balance policies. This research study offers insight into the needs of female bank employees and suggests the way forward for organisations to appropriately prioritise WLB as a quality strategy in an attempt to retain talented women in their sales and credit divisions. / Thesis (M.Soc.Sc.)-University of KwaZulu-Natal, Durban, 2013.

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