A flapper valve is made from a hardened and tempered high strength strip steel which opens and shuts as it is subjected to very high cyclic loads. Steel strip of which flapper valves are made from can   encounter a surface defect which are anticipated to influence fatigue life negatively. In this study, the influence of surface scratches on fatigue life of flapper valve strip was investigated. The analysis was carried out by using thirty samples that were blanked out of eight different steel strips in the transverse direction. Of these samples, fifteen of them had scratches on the surface and fifteen did not, all these samples were fatigue tested by constant amplitude method. An S-N curve was plotted based upon the values and results from the fatigue test, considering the curve as the nerve center in relation with fractrographic studies using the Scanning electron microscope. Therefore this master thesis work aims to explain the influence of scratches on fatigue life of flapper valve strip and suggest future improvements based on the findings.

Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 200-222).

Thesis (Ph. D.)--Ohio State University, 2008. / Title from first page of PDF file. Includes bibliographical references (p. 315-342).

Thesis (M.B.A.)--Carleton University, 2002. / Includes bibliographical references (p. 236-240). Also available in electronic format on the Internet.

Thesis (PhD) -- AUT University, 2008. / Includes bibliographical references. Also held in print (xiii, 265 leaves ; 30 cm.) in the Archive at the City Campus (T 338.47910688 BHA)

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M.Com. (Business Management) / The opportunity to create a case where students can apply their knowledge and insight pose a number of challenges. The purpose of this study was to create a case study that encapsulates various management opportunities and dilemmas that businesses face on a daily basis and explore possible questions and solutions, as well as reflect on the output ofthe process. This mini-dissertation starts by orientating the reader regarding the objective of the study, method followed and academic overview. It includes an overview of the evaluation criteria required to test the use and applicability of the case study. The case study "SwisslT: New horizons in stormy waters" is presented with a number of critical questions. A facilitation manual follows the case study and provides a structured grouping of the questions, an overview of didactic principles and discusses possible answers. The dissertation concludes with an evaluation of the case study and the answers by summarising the input received from facilitators, practicing managers and a management consultant. The conclusion drawn from this study is that the utilisation ofcase studies and the case method is not limited to only being a teaching tool. The process ofcreating and evaluating a case has value in itself. It not only supports the constructivist approach to teaching, but it also creates a platform for the identification offuture research topics as incorporated at the end of this study.

This thesis aims at examining processes in capitalist food production through a case study of Vion’s Halls factory in Broxburn, Scotland, which closed in 2012. The researcher uses his position as a former employee to receive interviews with former workers at the factory to gain knowledge about what happened in the factory and how that relates to bigger developments in the economy. Concepts such as buyers-driven supply chains, absolute and relative value production and flexible accumulation are guiding the interviews, using parts of the extended case method. Through this theoretical approach, the intention is to reach a better understanding of the local process and its interplay with broader developments and at the same time hopes to contribute to the theoretical field. No solid conclusion about the relationship of power in the supply chain could be gained from the interviews even if, in line with other studies, it indicates a move toward a buyers-driven supply chain with production for the retailers’ labels instead of its own brand. This was not followed by changes in the form of production with more flexibility and adaptations to rapidly changing markets, as was the case in the clothing industry. Instead, the Fordist method of standardized mass production appears to be utilized. A picture emerges of how Vion tries to counteract falling profits by intensifying the work process and extending the hours of production. This was made partly through aggressive management and the employment of skilled agency workers, getting more produced with fewer workers and without any substantial investments in new machines or technology.

No description available.