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 20 of 26 for “"Thermal isolation"”.
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Hybrid microfluidic cooling and thermal isolation technologies for 3D ICs
… dimensional (3D) integrated circuits (ICs) is thermal management. There are two main thermal challenges in typical 3D ICs. First, in the homogeneous integration with multiple high-power tiers, an effective cooling solution that scales with the number of dice in the stack is needed. Second, in …
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Experimental and numerical quantification of EV and PHEV battery pack thermal isolation strategies
… thesis is to quantify the effects of passive thermal management achieved through augmenting thermal isolation incorporated into an electrified vehicle’s energy storage system by design. Temperature changes within the cells are to be minimized over the typical 24 hour daily cycle when exposed …
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A micromachined thermo-optical light modulator based on semiconductor-to-metal phase transition
… switching by using surface micromachined low-thermal-mass pixels to achieve good thermal isolations, which ensures that each pixel can be individually switched without cross talking. In operation, the pixel temperature was controlled by integrated resistor on each pixel or spatially addressed …
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Birefringent single-arm fiber optic enthalpimeter for catalytic reaction monitoring
… Finding solutions to problems involving thermal isolation, specificity, sensitivity, and cross-sensitivity remain as active areas of interest. Fiberoptic interferometers, which use phase phenomena associated with propagating light, are extremely sensitive to heat. This research has …
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Raman scattering in free standing porous Si films
… Free-standing porous Si sample temperature and thermal conductivity are calculated by comparing intensities of Stokes and anti-Stokes Raman peaks. Compared to crystalline Si, we find strong decrease in thermal conductivity accompanied by a change in the phonon spectra. Also, comparing Stokes and …
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Design and Commissioning of a Hybrid Additive Manufacturing System Combining Inkjet Deposition and Laser Powder Bed Fusion
… design considerations for the system including thermal isolation of the inkjet system, temperature control of the build volume (up to 500C), and atmosphere control are discussed.
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Model microfluidic platform prototyping : design and fabrication of a Polymerase Chain Reaction (PCR) chip
… requires precise temperature control and proper thermal isolation of the three temperature zones. In this thesis, the design of a continuous flow PCR microfluidic platform consisting of a monolithic polydimethylsiloxane (PDMS) microfluidic chip assembled on top of a thin film patterned glass base …
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High-temperature microfluidic systems for thermally-efficient fuel processing
… where heat transfer rates are often very high, thermal management is a major challenge. This thesis investigates the use of silicon microfabrication technology to fabricate high-temperature submillimeter-scale fuel processors designed to maximize thermal efficiency. A prototype …
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Integrated microfluidics, heaters, and electronic sensors for Lab-on-a-Chip applications
… of as little as 11nL of reagents over different thermally isolated temperature zones, to be coupled with the field effect sensing capabilities, for label-free detection of biomolecules such as DNA. The microfluidic valves provide control over reagent flow, and flow rates of up to 1.8nLs⁻¹ have …
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INFRARED SENSORS USING SILICON MICROSTRUCTURES
… two groups of detectors: photon detectors and thermal detectors. The high costs of cooling apparatus and infrared ( lR ) sensitive materials restrict the wide application of the photon detector as an IR imager. Recent development of microbolometer detectors enables the fabrication of uncooled …
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Thermal, Electrical, and Spin Transport: Encompassing Low-Damping Ferromagnets and Antiferromagnetic/Ferromagnetic Heterostructures
… This dissertation primarily employs two devices: thermal isolation platform devices employed for measuring thermal conductivity, electrical resistivity, and thermopower of thin films, and the Hall bar design for exploring spin-related phenomena such as the spin Seebeck effect and spin Hall …
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Antenna-coupled Infrared And Millimeter-wave Detectors: Fabrication, Measurement And Optimization
… to infrared radiation is affected by the thermal-conduction properties of the sensor structure. Two fabrication processes were developed to improve the thermal isolation of the antenna-coupled bolometer from its substrate. The first process creates a membrane beneath the device. Measured …
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Design, Fabrication And Testing Of A Shape Memory Alloy Based Cryogenic Thermal Conduction Switch
… this work is to develop an SMA based cryogenic thermal conduction switch for operation between dewars of liquid methane and liquid oxygen in a common bulk head arrangement for NASA. The design of the thermal conduction switch is based on a biased, two-way SMA actuator and utilizes a commercially …
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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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Heat, Charge and Spin Transport of Thin Film Nanostructures
… itself. In this dissertation I present our thermal isolation platform that is primarily used for detection of thermally induced effects in a wide variety of materials. We can accurately and precisely produce in-plane thermal gradients in these membranes, allowing for thin film measurements …
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Thermal, Magnetic, and Electrical Properties of Thin Films and Nanostructures: From Magnetic Insulators to Organic Thermoelectrics
… techniques and instrumentation used in magnetic, thermal, and electrical property measurements of thin films and nanostructures. The understanding of trapped-flux induced artifacts in SQUID magnetometry of large paramagnetic substrates allows for the resolution of increasingly small moments. Using …
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Conformal cooling and rapid thermal cycling in injection molding with 3D printed tools
… the application of this capability to improved thermal management for injection molding tooling through: i)cooling lines which are conformal to the mold surface which provide improved uniformity and stability of mold temperature and ii) tools with low thermal inertia which, in combination with …
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Nonequilibrium behaviour and quasiparticle heating in thin film superconducting microwave resonators
… superconducting thin films, driving them out of thermal equilibrium with the bath. Using the Chang & Scalapino equations, I calculate numerically the steady-state quasiparticle and phonon distributions for various sources of power (sub-gap and above-gap photons and phonons, single frequency and …
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Sodium chlorate oxygen generation for fuel cell power systems
… through the use of improved insulation and thermal isolation techniques.
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Evaluation of foam concrete physical properties and mechanical response under indentation
… applications such as excavatable landfilling or thermal isolation. Different from solid material, this cellularized cementitious foam tends to exhibit extensive plastic deformation when loaded to failure, accompanied by considerable energy dissipation. Taking advantage of this crushable nature, a …
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