published_or_final_version / Comparative Asian Studies / Master / Master of Arts

The objective of the research was to determine the role which South African trade policy played in shaping the development of the domestic petrochemical industry. The focus of the study falls on the domestic development of the petrochemical industry in general, and the polymer industry in particular. Three broad stages are distinguished in the domestic development of the petrochemical industry. Prior to the early 1970's development occurred primarily on an ad hoc basis, with the establishment of domestic production plants for most major petrochemicals. The development of the domestic petrochemical industry over the period from the early 1970's to the early 1980's was characterised by rapid growth in the domestic production of petrochemicals, while the period from the early 1980's to the early 1990's saw a significant slowdown in the annual growth rate for the domestic production of petrochemicals. The role of trade policy in the industry's development over each of these three periods could not be established conclusively. In each period a number of factors were identified which may have impacted on the industry's development. However, two factors do appear to have played particularly important roles in the industry's development prior to the early 1980's, namely strong growth in domestic petrochemical demand and the provision of a substantial degree of protection through quantitative import controls and tariffs. with regard to the industry's development over the period from the early 1980's to the early 1990's, a number of factors were identified which may have influenced trends in domestic petrochemical production, including the withdrawal of quantitative import controls and the progressive lowering of import tariffs, the depreciation of the rand in the mid-1980's, a slowdown in the growth of the domestic demand for petrochemicals, the fall in the international prices of petrochemicals in the early 1980's, and the fall in the international oil price in the mid-1980's. In view of the small size of the domestic petrochemical market it is recommended that local petrochemical producers should continue to expand their focus beyond that of producing solely for the requirements of the domestic market. In light of the key role played by the petrochemical industry in a modern economy, it is also recommended that the industry in South Africa receive more attention from policy makers than it has in the past.

The petroleum industry has one of the most complex supply chains in the world. A unique characteristic of Petroleum Supply Chain (PSC) is the high degree of uncertainty which propagates through the network. Therefore, it is necessary to develop quantitative models aiming at optimizing the network and managing logistics operations. This work proposes a deterministic Mixed Integer Linear Program (MILP) model for downstream PSC to determine the optimal distribution center (DC) locations, capacities, transportation modes, and transfer volumes. Three products are considered in this study: gasoline, diesel, and jet fuel. The model minimizes multi-echelon multi-product cost along the refineries, distribution centers, transportation modes and demand nodes. The relationship between strategic planning and multimodal transportation is further elucidated. Furthermore, this work proposes a two stage Stochastic Mixed Integer Linear Program (SMILP) models with recourse for PSC under the risk of random disruptions, and a two stage Stochastic Linear Program (SLP) model with recourse under the risk of anticipated disruptions, namely hurricanes. Two separate types of mitigation strategies – proactive and reactive – are proposed in each model based on the type of disruption. The SMILP model determines optimal DC locations and capacities in the first stage and utilizes multimode transportation as the reactive mitigation strategy in the second stage to allocate transfer volumes. The SLP model uses proactive mitigation strategies in the first stage and employs multimode transportation as the reactive mitigation strategy. The goal of both stochastic models is to minimize the expected total supply chain costs under uncertainty. The proposed models are tested with real data from two sections of the U.S. petroleum industry, PADD 3 and PADD 1, and transportation networks within Geographic Information System (GIS). It involves supply at the existing refineries, proposed DCs and demand nodes. GIS is used to analyze spatial data and to map refineries, DCs and demand nodes to visualize the process. Sensitivity analysis is conducted to asses supply chain performance in response to changes in key parameters of proposed models to provide insights on PSC decisions, and to demonstrate the impact of key parameters on PSC decisions and total cost. / Upper Great Plains Transportation Institute (UGPTI) / Mountain Plains Consortium (MPC)

<p> Carbon sequestration is a promising solution to mitigate the accumulation of greenhouse gases. Depleted oil and gas reservoirs are desirable vessels for carbon sequestration. It is crucial to maintain the sealing ability of carbon sequestration fields with high concentrations of CO₂.</p><p> A systematic well integrity evaluation system has been developed and validated for carbon sequestration fields. The system constitutes 1) a newly developed analytical model for assessing cement sheath integrity under various operating conditions, 2) quantifications of well parameters contributing to the probability of well leakage, and 3) genetic-neural network algorithm for data analysis and well-leakage probability assessment.</p><p> A wellbore system consists of well casing, cement sheath, and formation rock. A new analytical stress model was developed. The new analytical model solves for the stresses in the casing-cement sheath formation system loaded by the isotropic and anisotropic horizontal in-situ stresses. Further analyses with the analytical model reveal that Young&rsquo;s modulus of cement sheath is a major factor that contributes to the sealing ability of the cement sheath, while Poisson&rsquo;s ratio and cohesion play less important roles in the cement sheath sealing ability. The cement sheath in the shale formation exhibits higher sealing ability than that in the sandstone formation. The sealing ability of weak cement is higher than that of strong cement.</p><p> Descriptive quantifications of well parameters were made in this study for analyzing their effect on the probability of well leakage. These parameters include well cement placement relative to aquifers and fluid reservoir zones, cement type, cement sheath integrity in operating conditions, well aging, and well plugging conditions. It is the combination of these parameters that controls the probability of well leakage. A significant proportion of wells were identified as risky wells in these two fields. It is concluded that the well trained neural network model can be used to predict the well leakage risk over the CO₂ sequestration lifespan, which can promote prevention activities and mitigations to the CO₂ leakage risky wells.</p>

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Call number: LD2668 .T4 1956 D37 / Master of Science

This dissertation is a contribution to two fields of study: applied social epistemology and the philosophy of technology. That is, it is a philosophical study, based on empirical fieldwork research, of social and technical knowledge. Social knowledge here is defined as knowledge acquired through the interactions between epistemic agents and social institutions. Technical knowledge is here defined as knowledge about technical artefacts (including how to design, produce, and operate them). I argue that the two must be considered collectively both in the sense that they are best considered in the light of collectivist approaches to knowledge and in the sense that they must be considered together as part of the same analysis. An analysis solely of the interactions between human epistemic agents operating within social institutions does not give adequate credit to the technological artefacts that help to produce knowledge; an analysis of technical knowledge which does not include an analysis of how that technical knowledge is generated within a rich and complex social network would be similarly incomplete. I argue that it is often inappropriate to separate analyses of technical knowledge from social knowledge and that although not all social knowledge is technical knowledge, all technical knowledge is, by definition, social. Further, the influence of technology on epistemic cultures is so pervasive that it also forms or 'envelops' what we consider to be an epistemic agent.

This thesis provides a structure for understanding the various issues in the design and implementation of a petroleum tax system. Its main objective is to examine whether the Nigerian petroleum tax system is appropriately designed to achieve the benefits the country desires from its petroleum contractual arrangements. Informed by the literature reviewed, economic rent theory was adopted as a theoretical framework in the thesis. While other theories could have been applied as a framework, economic rent theory was deemed to be most appropriate because taxes levied on economic rent are not generally perceived to act as a disincentive to the initiation or continuation of business operations. Informed views on the petroleum fiscal system used in Nigeria were sought from a range of "experts" in the field via a large scale questionnaire. The empirical data collected were then subjected to statistical analysis to determine the overall response patterns of the respondents for each of the 58 variables surveyed. This analysis enabled tentative conclusions to be drawn about the validity of various hypotheses developed in the thesis. Further analysis was carried out to determine and critically assess statically significant responses between respondent groups. The study revealed that the Nigerian petroleum taxation system was viewed as being well-designed, insofar as it protects the interests of both the government and the international oil companies operating within Nigeria. Furthermore, the "expert" respondents were of the view that a majority of the measures put in place to ensure compliance with the petroleum taxation system have been effective. However, the study revealed differences in views amongst the various groups of "experts" to some questions which suggests that some groups may have articulated views based on partisan values. The differences suggest that the different groups may have vested interests in the petroleum taxation system. Given the role these groups play in the petroleum fiscal system in Nigeria, it is argued that these vested interests may well have negatively affected the design and operation of the petroleum fiscal system. This finding may have important implications for the future design and operation of the Nigerian petroleum taxation system. The literature reviewed and survey data analysed resulted in a number of conclusions. First, it is argued that it is very difficult to make a single petroleum tax system that serves the needs of different countries. Second, it is suggested Nigeria‘s petroleum tax regime is predicated upon a desire to capture as much revenue as possible for the government. Third, the thesis concludes that the implementation processes of the Nigerian petroleum tax system are fundamentally weak and require further improvement. Fourth, it is also the conclusion of this thesis that the Nigerian petroleum tax system lacks the capacity for timely review. Finally, it is shown that the Nigerian petroleum tax system is sensitive to changes in tax regulations across oil producing countries.