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 13 of 13 for “"Phase changing"”.
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Polymer Microchips for Capillary Electrophoresis and Electric Field Gradient Focusing of Biomolecules
… with improved separation performance, phase-changing sacrificial materials were developed for solvent bonding of polymer microchips. Devices were fabricated by filling channels in embossed PMMA with a heated liquid that formed a solid sacrificial layer at room temperature. The …
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Design and Simulation of Passive Thermal Management System for Lithium-Ion Battery Packs on an Unmanned Ground Vehicle
… expanded graphite matrix infiltrated with a phase-changing paraffin wax. The redesigned battery pack was similarly modeled, showing a decrease in the maximum temperature to 50.3 <strong>°</strong>C after 630 seconds at the same power draw. The proposed passive thermal management system kept …
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Multimaterial rectifying device fibers
… drawing process are described and measured. Phase changing semiconductors are incorporated into the fiber having both amorphous properties amenable to thermal drawing and crystalline properties ideal for electronic devices. Combinations of metals and semiconductors that form both blocking and …
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Combined Steam Power Cycle and Turbofan Engine for Improvement in Aviation Climate Impacts
… needs to be capable of representing the water phase changes and the heat exchangers required to drive those phase changes. My contribution is the development of such a model – with special attention to the modeling of water properties and phase change of water – which ties heat exchanger models …
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Design and fabrication of a digitally reconfigurable surface
… cost for the device. In addition, the phase changing clutch array, when coupled with notched or threaded pins, has an excellent holding strength allowing for many possible high pressure molding applications on surfaces generated. It is my hope that this research will one day pave the …
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Heat Transfer During Melting and Solidification in Heterogeneous Materials
… conductance. The matrix is not allowed to change phase and energy is either generated inside the matrix or transferred from the boundaries, which is initially conducted through the matrix material. The physical model of this coupled, two-step heat transfer process is solved using the energy …
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A study of shape memory polymers and their usage in the development of directional dry adhesives
… shape memory polymers and their unique phase-changing and recoverability properties. The underlying thermodynamic explanations along with their fundamental governing equations is presented. A few possible potential areas of interest for applications of this unique polymer are presented, …
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Microchip Liquid Chromatography and Capillary Electrophoresis Separations in Multilayer Microdevices
… connected with reservoirs for sample and mobile phase, situated at the ends of microchannels for sample injection and separation, respectively. Columns micromachined in glass were coated covalently with an organic stationary phase to provide a separation medium. A pressure-balanced sample …
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Scanning tunneling microscopy and spectroscopy study of layered transition metal chalcogenide thin films tuned by thickness, structural phase, and heterostructure
… WTe2 is a quantum spin Hall insulator, a novel phase of quantum matter, while bulk WTe2 is a Weyl semimetal. Moreover, the electronic and magnetic properties of thin films are able to be tuned by various methods, including chemically doping, electrically gating, varying the structural phase, …
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Development of Quantitative Ultrasound-Mediated Molecular Imaging of The Tumor Microenvironment
… platform was developed to image and activate phase-changing perfluorocarbon nanodroplet contrast agents (PNCAs). Using this imaging platform, PNCAs were activated and imaged to determine PNCA enhancement. Optimal PNCA particles generated a median signal enhancement of 6.2 in a phantom …
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Experimental investigation of an integrated solar driven wastewater treatment system for trigeneration applications
… unit drives the reactor. For the hot side, the phase change material (PCM) which is heated by the concentrator feeds TEG, and the wastewater stream provides the cold surface. The PEC system is investigated experimentally while the design and calculations of the TEG-PCM sub-system are analyzed …
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Processing and characterization of laser-synthesized overcoats for surface engineering
… solidify via hypoeutectic (primary fcc-$\gamma$ phase and interdendritic $\gamma$ and Cr-rich $\rm M\sb7C\sb3$ phase (hypoeutectic) or hypereutectic (primary Cr-rich carbides and eutectic network) solidification modes depending on the alloy composition. In-situ TEM study of the Fe-Cr-W-C coatings …
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In-situ plasmon-enhanced characterization of optically accessible ultra-thin film ferroelectric devices
… 4, Evidence of vacancy migration assisted phase change in FE memories, this study shows the optical tracking of oxygen migration induced phase change in ultra-thin film (≤5 nm) ferroelectric devices. While Hafnia-based films have achieved ferroelectricity at single-digit nanometre …