A realization of a division algorithm suitable for high speed pipeline and realtime processors is presented. Implementation of the divide algorithm can be achieved by utilizing LSI / VLSI gate array technology. The divider performs precision, high speed 9 bit sign magnitude division. The design consist of combinational logic, where input and output data are latched into input and output registers. Data propagates through 16 divide stages. The n'th stage generates the n'th quotient bit upon receiving the updated dividend and controls from the previous stage. A simulation program is developed to verify the algorithm, and an analysis for speed performance and cost is provided. Other division algorithms are discussed.

A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in ful lment of the requirements for the degree of Master of Science in Engineering. Johannesburg, April 2016 / An explosive event in an industrial gas transmission pipe stresses the pipe and can result in pipe rupture and separation at weak points. A shock wave results propagating from the high pressure section of the pipe, through the gap and to the low pressure section. The present study simulates numerically and experimentally the resulting ow eld at the position of pipe separation and propagation conditions in both pipe sections. The e ects of gap width, gap geometry and shock Mach number variation are investigated. Shock Mach numbers of 1.34, 1.45,1.60 and 2.2, gap widths of 40mm to 310mm were used. All variations of boundary conditions were found to have an e ect on the propagation conditions as well as the development of the ow features within the gap. The variation of the gap geometry was done for a pipe gap and a anged gap experimentally. Extended geometries were simulated numerically. For the pipe gap, the incident shock wave accelerated the gas in the upstream pipe to high subsonic speeds and continued in the downstream pipe at a much reduced strength. A strong expansion propagated into the ow in the upstream pipe causing a signi cant pressure drop from the initial post-shock pressure. Expansion waves at the out ow resulted in supersonic speeds as the ow entered the gap for Mach 1.45 and 1.6. A notable feature was the formation of a standing shock at the inlet to the downstream pipe. In addition to the standing shock, shock cells of alternating shocks and expansions developed within the gap essentially controlling the propagation conditions in the downstream pipe. For the lower Mach number of 1.3, no sharp discontinuities were noticed. The e ect of the gap width was found on the nature of the shock cells within the gap. The propagation conditions in the downstream pipe showed that the pressure is initially unsteady but becomes more uniform, controlled by the developed wave system in the gap. For the anged gap case, the ow within the gap is con ned for much longer and hence produced much more intense and complex ow feature interactions and an earlier transition of the ow to turbulence. Numerical investigations for a burst pipe gap, for a gap with a di erent diameter downstream pipe and a gap with a 90-degree bend downstream pipe produced peculiar ow features. / MT2016

"August 2002" / Bibliography: leaves 219-228. / xxix, 255 p. : ill., photos. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Civil and Environmental Engineering. 2003

Thesis (Ph.D.)--University of Tulsa, 1991. / Includes bibliographical references (leaves 106-109).

Thesis (M.Eng.)--University of Wollongong, 2005. / Typescript. Includes bibliographical references: leaf 115-120.

Thesis (M.A. in anthropology)--Washington State University. / Includes bibliographical references.

Thesis (M. Eng.), Memorial University of Newfoundland, 1998. / Restricted until November 1999. Bibliography: leaves 22-25.

The majority of the world's offshore infrastructures are now showing the sign of aging and are approaching the end of their original design life. Their ability to withstand various operational and environmental changes have been the main concerns over the years. This is because the pipeline will still need to operate for a few more decades with increasing demand of oil and gas supply. To address the issues, an effective pipeline integrity management system is required to manage pipeline systems and to ensure the reliability and availability of the pipeline. The main goal is to identify, apply, and assess the applicability of the Bayesian network approach in evaluating the integrity of subsea pipelines that evolves with time. The study is aimed to specifically handle knowledge uncertainties and assist in the decision making of subsea pipeline integrity assessment. A static Bayesian network model was developed to compute the probability of pipeline condition and investigate the underlying factors that lead to pipeline damage. From the model, the most influential factors were identified and the sensitivity analysis demonstrated that the developed model was robust and accurate. The proposed model was then extended to develop a decision tool model using an Influence Diagram. The results from the proposed influence diagram were used to prioritize the maintenance scheme of the pipeline segments. Benefit to cost ratio was applied to determine the pipeline maintenance intervals. Dynamic Bayesian network was utilized to model timedependent deterioration of pipeline structural reliability. A good agreement with conventional structural reliability method is achieved. The present thesis has demonstrated the applicability and effectiveness of Bayesian network approach in the field of oil and gas. It is hoped that the proposed models can be applied by oil and gas pipeline practitioners to enhance the integrity and lifeltime of the oil and gas pipeline.

M.Comm. / The demand for products which are distributed through pipelines has increased worldwide over the last decade. These increases in demand have irrevocably impacted upon top management’s perceptions of risks associated with energy pipeline supply chains. Even in South Africa, the increase in demand for products such as diesel, jet fuel and petrol, which are supplied through the energy pipeline supply chains have increased the risks associated with energy pipeline supply chains. This study explores the different risks associated with South African energy pipelines, and investigates whether these risks can have an influence on the business as well as the physical environment of the energy pipeline supply chains. A literature study was conducted and three energy pipeline supply organisations surveyed to determine what their specific viewpoints were regarding the risks faced by the South African energy pipeline supply chains.

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