7 research outputs found

    Analysis, synthesis, and fabrication of VLSI Si detector arrays for optoelectronic interconnections

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    Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.Includes bibliographical references (p. 141-145).by Edward Joseph Ouellette, III.M.S

    Acta Polytechnica Hungarica 2020

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    Renewable Energy

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    This book discusses renewable energy resources and systems as well as energy efficiency. It contains twenty-three chapters over six sections that address a multitude of renewable energy types, including solar and photovoltaic, biomass, hydroelectric, and geothermal. The information presented herein is a scientific contribution to energy and environmental regulations, quality and efficiency of energy services, energy supply security, energy market-based approaches, government interventions, and the spread of technological innovation

    Static Fatigue: A Key Cause of Time Effects in Sand.

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    Freshly deposited or disturbed sands have a tendency to alter their mechanical properties. This is often seen after dynamic compaction of sand beds, where at first, the cone penetration resistance may not have increased, but in a matter of weeks and months the increase in resistance to penetration becomes evident. This time effect has been known for decades, but there is no universally accepted explanation as to what causes such time-delayed effects in sands. A hypothesis is postulated, which suggests that a key contributing factor behind time effects in sands is the delayed fracturing of the micro-morphological features present on surfaces of sand grains in contact. Experimental tests performed as part of this research support this hypothesis, and the numerical simulations indicate that the hypothesis is plausible. Experiments were performed using two custom-designed laboratory devices for testing of inter-granular sand contacts, and also tests were carried out on sand specimens, dry and wet. All experimental results are consistent with the hypothesis suggested. In addition, discrete element and finite element computations were performed as part of this study on aging of sand. Discrete element simulations were able to mimic the characteristics of the true (experimental) process when the static fatigue hypothesis was used. The model also predicted an increase in horizontal stress in sand subjected to sustained vertical load with restrained horizontal deformation, which is central to explaining the process of time-delayed increase in cone penetration resistance of sands after disturbance. Aging of sands under confined conditions leads to an increase in inter-granular contact stiffness, and thereby, to an increase in macroscopic elastic moduli, but the internal friction angle of sand remains nearly unchanged during aging.PHDCivil EngineeringUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/102292/1/siddu_1.pd

    Space station systems: A bibliography with indexes (supplement 6)

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    This bibliography lists 1,133 reports, articles, and other documents introduced into the NASA scientific and technical information system between July 1, 1987 and December 31, 1987. Its purpose is to provide helpful information to the researcher, manager, and designer in technology development and mission design according to system, interactive analysis and design, structural and thermal analysis and design, structural concepts and control systems, electronics, advanced materials, assembly concepts, propulsion, and solar power satellite systems. The coverage includes documents that define major systems and subsystems, servicing and support requirements, procedures and operations, and missions for the current and future Space Station

    Funcional Characterization of MEL-28/ELYS

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    Programa de Doctorado en BiotecnologĂ­a y TecnologĂ­a QuĂ­micaUniversidad Pablo de Olavide de Sevilla. Departamento de BiologĂ­a Molecular e IngenierĂ­a BioquĂ­micaPostprin
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