Global ETD Search

1	Concentrated Solar Thermoelectric Generators Based on V-shaped Metallic Couples Li, Xinjie January 2020 (has links) No description available. Electrical Engineering solar thermoelectrics thermoelectric generator metallic TE elements TE module fabrication
2	Development of Bi-Directional Module using Wafer-Bonded Chips Kim, Woochan 06 January 2015 (has links) Double-sided module exhibits electrical and thermal characteristics that are superior to wire-bonded counterpart. Such structure, however, induces more than twice the thermo-mechanical stress in a single-layer structure. Compressive posts have been developed and integrated into the double-sided module to reduce the stress to a level acceptable by silicon dice. For a 14 mm x 21 mm module carrying 6.6 mm x 6.6 mm die, finite-element simulation suggested an optimal design having four posts located 1 mm from the die; the z-direction stress at the chip was reduced from 17 MPa to 0.6 MPa. / Ph. D. Double-sided die wafer-bonded chip hourglass joint compressive post module fabrication module characterization high density integration thermal management thermo-mechanical stress reliability test
3	A Risk Based Approach to Module Tolerance Specification Shahtaheri, Yasaman 22 April 2014 (has links) This research investigates tolerance strategies for modular systems on a project specific basis. The objective of the proposed research is to form a guideline for optimizing the construction costs/risks with the aim of developing an optimal design of resilient modular systems. The procedures for achieving the research objective included: (a) development of 3D structural analysis models of the modules, (b) strength/stability investigation of the structure, (c) developing the fabrication cost function, (e) checking elastic and inelastic distortion, and (f) constructing the site-fit risk functions. The total site-fit risk function minimizes the cost/risk associated with fabrication, transportation; alignment, rework, and safety, while maximizing stiffness in terms of story drift values for site re-alignment and fitting alternatives. The fabrication cost function was developed by collecting 61 data points for the investigated module chassis using the SAP2000 software while reducing the initial section sizes, in addition to the fabrication costs at each step (61 steps). With the reduction of the structural reinforcement, story drift values increase, therefore there will be a larger distortion in the module. This generic module design procedure models a trade-off between the amount of reinforcement and expected need for significant field alterations. Structural design software packages such as SAP2000, AutoCAD, and Autodesk were used in order to model and test the module chassis. This research hypothesizes that the influential factors in the site-fit risk functions are respectively: fabrication, transportation, alignment, safety, and rework costs/risks. In addition, the site-fit risk function provides a theoretical range of possible solutions for the construction industry. The maximum allowable modular out-of-tolerance value, which requires the minimum amount of cost with respect to the defined function, can be configured using this methodology. This research concludes that over-reinforced or lightly-reinforced designs are not the best solution for mitigating risks, and reducing costs. For this reason the site-fit risk function will provide a range of pareto-optimal building solutions with respect to the fabrication, transportation, safety, alignment, and rework costs/risks. Risk Tolerance Tolerance Specification Risk Based Risk Based Approach Module Modular Module Tolerance Module Tolerance Specification Fabrication Cost Function Risk Function Module Fabrication Module Risk Function Module Fabrication Cost Module Risk Optimal Resilient Design Perato Optimal Boundary Optimal Module Resilient Design SAP2000 Module Transportation Risk Module Alignment Risk Module Safety Risk Module Rework Risk Story Drift Over Reinforcement Lightly Reinforced Lightly Reinforced Module Elastic Inelastic Distortion Stiffness Optimal Modular Resilient Design Over Reinforced Module

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