Thesis (S.B.)--Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013. / Cataloged from PDF version of thesis. / Includes bibliographical references (page 29). / An attempt was made at reconstructing the now decommissioned World War II era destroyer USS Cassin Young using blueprints on file at the Hart Nautical Museum . After the electronic model was constructed, an attempt was made to run an FEA analysis to determine stress levels in the ship's hull. The ship was made using the various Solidworks tools available including surfacing and extrusion tools while using the available blueprints for recreation accuracy. The FEA was not completed due to problems encountered in the meshing and analysis of the complex geometry of the ship hull. / by Malik Miller. / S.B.

During World War II, the United States Army employed a new weapon on the battlefield in an attempt to defeat German armor tactics: the tank destroyer. Tank Destroyer Force was created to stem the tide of German armored attacks and form an opening for American tanks to make their own counter-attacks. Since the end of the war, tank destroyer battalions have been regarded as a failed experiment, despite the evidence that they effectively did their jobs. The negative feedback in the immediate post-war period lead to the dissolution of the Tank Destroyer Force. Many of the studies of tank destroyers focus on the doctrine they followed and the faults in it. However, most of the studies do not look at the successful application of tank destroyer doctrine in the field by tank destroyer battalions. This paper will examine operations of the 773rd Tank Destroyer Battalion and its application of tank destroyer doctrine during the Battle of Chambois from August 17-21, 1944, for which it won a Presidential Unit Citation.

<p>Through the collection and analysis of negotiations surrounding the gay magazine Destroyer, the intention of this paper is to identify norms of sexuality within a contemporary sex-radical discourse. These negotiations are collected from interviews with individuals whom, at the time of the inter-view, consider themselves or their politics sex-radical. In order to allow for a more general under-standing of the context in which these negotiations have come about, material about Swedish law is also included in this text, together with the interview material, and serves as a base for analysis through the application of Gayle Rubin’s theory on the hierarchical value system of sexuality.</p><p>Following, are the main themes throughout the paper: The meaning of the context; Sexualized children; The possibility to (not) participate: differences of power; The decision whether or not to sell the publication and The position of the pedophile and crossgenerational love/sexuality within the LGBTQ community.</p><p>Key words: sex radicalism, pornography, boy-love, kiddy porn, pedophilia, Destroyer, Gayle Rubin.</p>

Through the collection and analysis of negotiations surrounding the gay magazine Destroyer, the intention of this paper is to identify norms of sexuality within a contemporary sex-radical discourse. These negotiations are collected from interviews with individuals whom, at the time of the inter-view, consider themselves or their politics sex-radical. In order to allow for a more general under-standing of the context in which these negotiations have come about, material about Swedish law is also included in this text, together with the interview material, and serves as a base for analysis through the application of Gayle Rubin’s theory on the hierarchical value system of sexuality. Following, are the main themes throughout the paper: The meaning of the context; Sexualized children; The possibility to (not) participate: differences of power; The decision whether or not to sell the publication and The position of the pedophile and crossgenerational love/sexuality within the LGBTQ community. Key words: sex radicalism, pornography, boy-love, kiddy porn, pedophilia, Destroyer, Gayle Rubin.

The need for a reduced dependence on fossil fuels is motivated by a wide range of factors: from increasing fuel costs, to national security implications of supply, to rising concern for environmental impact. Although much focus is given to terrestrial systems, over 90% of the world's freight is transported by ship. Likewise, naval warfighting systems are critical in supporting U.S. national interests abroad. Yet the vast majority of these vessels rely on fossil fuels for operation. The results of this thesis illustrate a common theme that hybrid mechanical-electrical marine propulsion systems produce substantially better fuel efficiency than other technologies that are typically emphasized to reduce fuel consumption. Naval and commercial powertrains in the 60-70 MW range are shown to benefit substantially from the utilization of mechanical drive for high speed propulsion; complemented by an efficient electric drive system for low speed operations. This hybrid architecture proves to be able to best meet the wide range of performance requirements for each of these systems, while also being the most easily integrated technology option. Naval analyses evaluate powertrain options for the DDG-51 Flight III. Simulation results using actual operational profile data show a CODLAG system produces a net fuel savings of up to 12% more than a comparable all-electric system, corresponding to a savings of 37% relative the existing DDG-51 powertrain. These results prove that a mechanical linkage for the main propulsion engine greatly reduces fuel consumption and that for power generation systems requiring redundancy, diesel generators represent a vastly superior option to gas turbines. For the commercial application it is shown that an augmented PTO/PTI hybrid system can better reduce cruise fuel consumption than modern sail systems, while also producing significant benefit with regard to CO2 emissions. In addition, using such a shaft mounted hybrid system for low speed electric drive in ports reduces NOx emissions by 29-43%, while CO is reduced 57-66% and PM may be reduced up to 25%, depending on the specific operating mode. As an added benefit, fuel consumption rates under these conditions are reduced 20-29%. / text