Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Thermal actuation"”.
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Fully Compliant Tensural Bistable Mechanisms (FTBM) with On-Chip Thermal Actuation
… with optimization. In a coupled design approach, thermal actuators were optimized to the force and displacement requirements of the bistable mech-anisms, and selected FTBM devices were combined in switching systems with the result-ing Thermomechanical In-plane Microactuators (TIMs) and Amplified …
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Thermally-actuated piezoresistively-sensed mechanical silicon oscillator
… feedback mechanism. The oscillator is based on a thermal actuation mechanism due to the Joule heating effect caused by running currents through narrow channels. These narrow channels when oriented along the <100>direction in an n-doped Si wafer, show large negative piezoresistance coefficients. …
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On-Chip Actuation of Compliant Bistable Micro-Mechanisms
… be switched in either direction using on-chip thermal actuation. The energy storage and bistable behavior of the mechanisms are achieved through the elastic deflection of compliant segments. The pseudo-rigid-body model was used for the compliant mechanism design, and for analysis of the …
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High-Resolution Thermal Measurements in Fluids
Based on the thermal measuring methods for mass-flow sensors a thin-film sensor is presented allowing flow-rate measurements of down to 1 milligramm per hour, as required for application in medical dosing systems. <br>Due to the fast response of the sensor to thermal actuation and its low power …
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Steady and Unsteady Thermo-Strucural Simulation of Thermally Actuated Micro- and Nano-Structures
… and fixed boundary conditions which are either thermally positioned, buckled, or actuated. The study begins with simulating a pinned-pinned beam in micro-scale and nano-scale. The steady state thermo-structural equation is solved numerically using an implicit Finite Difference method implemented …
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Active wavefront correction in laser interferometric gravitational wave detectors
… method of active wavefront correction via direct thermal actuation on optical elements of the interferometer; or, "thermally adaptive optics". A simple nichrome heating element suspended off the face of an affected optic will, through radiative heating, remove the gross axisymmetric part of the …
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Gas lift valve failure mode analysis and the design of a thermally-actuated positive-locking safety valve
… fluid-mechanical model and a transient thermal model are constructed to study failure modes and sensitivities of a gas-lifted well system including the reservoir, two-phase flow within the tubing, and gas lift valve geometry. A set of three differential algebraic equations of the system …
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Thermally actuated MEMS seal for vacuum applications
… of an isolated silicon island supported on a thermally-insulating silicon nitride membrane in the center of a die. The through via is surrounded by a moderately high aspect ratio ring of indium solder. To seal the solder over the through via, the island and solder are heated by passing a …
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Methods for nano-precise overlay in advanced in pick-and-place assembly
… overlay in multi-field patterning, including thermal-actuation based substrate-distortion-control, and genetic algorithm-based template topology-optimization. Separately, we have realized that localized overlay errors can be introduced in J-FIL due to sub-micron sized particles, which are …
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Analysis and Design of Surface Micromachined Micromanipulators for Out-of-Plane Micropositioning
This thesis introduces two ortho-planar MEMS devices that can be used to position microcomponents: the XZ Micropositioning Mechanism and the XYZ Micromanipulator. The displacement and force relationships are presented. The devices were fabricated using surface micromachining processes and the …
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High Frequency Thermally Actuated Single Crystalline Silicon Micromechanical Resonators with Piezoresistive Readout
… frequencies.</p> <p>In this presented research, thermally actuated resonators with piezoresistive readout have been developed. It has been shown that not only do such resonators require a simple fabrication process, but also their performance improves at higher frequencies by scaling down all the …
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Temperature and dynamic form in contemporary hardscape environments
This thesis explores how the property of thermal expansion in building materials can be leveraged to express seasonality in hardscape environmental design. Four contemporary designed landscapes (Princess Diana Memorial Fountain, Memorial to the Murdered Jews of Europe, Theater Square, and Seattle …