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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.
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The inverse problem in the theory of electromagnetic shapingFelici, Thomas P. January 1992 (has links)
No description available.
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Design optimization for obtaining zero defects in steel castingPurkar, Pranit Pramod January 2019 (has links)
This thesis is about the design of the gating system and selection of proper alloy for defects free (grate bar) casting. The gating system plays an important role in casting manufacturing process. The gating system has different elements like pouring cup, sprue, well, runner, riser, and ingates. The function of the gating system is to provide molten metal to the mould cavity through different gating system elements. Casting is a metal shaping process which is used to produce a cast component. The casting process depends upon the material, type of pattern, mould and various techniques like sand casting, investment casting, die casting, squeeze casting and lost foam casting. The sand mould casting process is used in this report. The casting process is used for making small to large cast parts, complicated shapes, and precision parts, etc. Making a casting without defects is an important requirement for its strength. The effective and efficient design of the gating system is necessary for making defects free castings. There are various defects like shrinkage cavity, porosity, pinholes, blowholes and incomplete filling that may occur in sand casting. The simulation software like Magma Soft and Nova Flow Solid are used to predict the possible defects in the casting. The uses of the simulation improve product quality and increase productivity. It also helps to reduce the rejection rate by identifying and controlling defects. This work is done at AB Bruzaholms Bruk as part of master thesis work at Jönköping University, Sweden. The company provides all the necessary data for simulation purposes. The design of the gating system is finalized as per company requirements and needs. The research questions that have been answered in this report based on the following points. 1) What does zero-defect mean? 2) Which is the best design among the ones that are prepared and simulated? 3) Which is the best alloy combination for casting parts that give defects free casting and better fluidity and filling?
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Corrosion Behaviors Of Stainless Steels In Molten Zinc Aluminum AlloyOzcan, Emre 01 July 2012 (has links) (PDF)
High grade galvanized steel in large amounts is needed to match the increasing
demand of automotive industry both in our country and in the world. Stainless steels,
used in fabrication of zinc bath hardware of continuous galvanizing lines, lose their
corrosion resistance due to various mechanisms in such mediums containing molten
metals like zinc and aluminum. Consequently they corrode to the levels where they
should be taken to maintenance or replaced. In this study, corrosion performance and
the effect of typical galvanizing and age treating heat treatments to mechanical
properties of 4 newly developed austenitic stainless steels and AISI 316L grade
stainless steel were investigated and compared with each other. Experimental studies
involved immersion corrosion tests for 168 and 504 hours followed by weight loss
determinations and comparisons of corrosion performances of age treated and
solution annealed stainless steels. Parallel with corrosion testing, delta ferrite content
v
determinations with 3 different methods, tensile tests and v-notch impact tests at 4
different heat exposure conditions were carried out and discussed. 2 new stainless
steel compositions were selected to be used in fabrication of galvanizing hardware
based on the comparisons of corrosion & / mechanical performances of candidate
steels.
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The Medieval Reception of Firdausī's Shāhnāma: The Ardashīr Cycle as a Mirror for PrincesAskari, Nasrin 02 August 2013 (has links)
Based on a broad survey of the reception of Firdausī’s Shāhnāma in medieval times, this dissertation argues that Firdausī’s oeuvre was primarily perceived as a book of wisdom and advice for kings and courtly élites. The medieval reception of the Shāhnāma is clearly manifested in the comments of medieval authors about Firdausī and his work, and in their use of the Shāhnāma in the composition of their own works. The production of ikhtiyārāt-i Shāhnāmas (selections from the Shāhnāma) in medieval times and the remarkable attention of the authors of mirrors for princes to Firdausī’s opus are particularly illuminating in this regard.
The survey is complemented by a close textual reading of the Ardashīr cycle in the Shāhnāma in comparison with other medieval historical accounts about Ardashīr, in order to illustrate how history in the Shāhnāma is reduced to only a framework for the presentation of ideas and ideals of kingship. Based on ancient Persian beliefs regarding the ideal state of the world, I argue that Ardashīr in the Shāhnāma is represented as a Saviour of the world. Within this context, I offer new interpretations of the symbolic tale of Ardashīr’s fight against a giant worm, and explain why the idea of the union of kingship and religion, a major topic in almost all medieval Persian mirrors for princes, has often been attributed to Ardashīr. Finally, I compare the Ardashīr cycle in the Shāhnāma with nine medieval Persian mirrors for princes to demonstrate that the ethico-political concepts contained in them, as well as the portrayal of Ardashīr, remain more or less the same in all these works.
Study of the Shāhnāma as a mirror for princes, as this study shows, not only reveals the meaning of its symbolic tales, but also sheds light on the pre-Islamic roots of some of the ethico-political concepts presented in the medieval Perso-Islamic literature of wisdom and advice for kings and courtiers.
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The Medieval Reception of Firdausī's Shāhnāma: The Ardashīr Cycle as a Mirror for PrincesAskari, Nasrin 02 August 2013 (has links)
Based on a broad survey of the reception of Firdausī’s Shāhnāma in medieval times, this dissertation argues that Firdausī’s oeuvre was primarily perceived as a book of wisdom and advice for kings and courtly élites. The medieval reception of the Shāhnāma is clearly manifested in the comments of medieval authors about Firdausī and his work, and in their use of the Shāhnāma in the composition of their own works. The production of ikhtiyārāt-i Shāhnāmas (selections from the Shāhnāma) in medieval times and the remarkable attention of the authors of mirrors for princes to Firdausī’s opus are particularly illuminating in this regard.
The survey is complemented by a close textual reading of the Ardashīr cycle in the Shāhnāma in comparison with other medieval historical accounts about Ardashīr, in order to illustrate how history in the Shāhnāma is reduced to only a framework for the presentation of ideas and ideals of kingship. Based on ancient Persian beliefs regarding the ideal state of the world, I argue that Ardashīr in the Shāhnāma is represented as a Saviour of the world. Within this context, I offer new interpretations of the symbolic tale of Ardashīr’s fight against a giant worm, and explain why the idea of the union of kingship and religion, a major topic in almost all medieval Persian mirrors for princes, has often been attributed to Ardashīr. Finally, I compare the Ardashīr cycle in the Shāhnāma with nine medieval Persian mirrors for princes to demonstrate that the ethico-political concepts contained in them, as well as the portrayal of Ardashīr, remain more or less the same in all these works.
Study of the Shāhnāma as a mirror for princes, as this study shows, not only reveals the meaning of its symbolic tales, but also sheds light on the pre-Islamic roots of some of the ethico-political concepts presented in the medieval Perso-Islamic literature of wisdom and advice for kings and courtiers.
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