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 106 for “"Phase changes"”.
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Incorporation of phase changes in functional magnetic resonance imaging
… as a complex image pair including magnitude and phase information. The vast majority of fMRI experiments do not attempt to take advantage of the time varying phase information. The phase of the MRI signal is related to the local magnetic field changes, suggesting it may contain useful information …
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Equilibrium of stressed solids with respect to phase changes, and its geological applications.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1974.
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A New Dynamic Fluid Flow Method for Studying the Phase Changes of the Light/Heavy Crude Oil-Solvent Systems
… flow (DFF) method, was developed to study the phase changes of various light/heavy crude oil‒solvent systems. First, two series of constant-composition-expansion (CCE) tests and constant-composition-expansion and compression (CCEC) tests were conducted by using a pressure‒volume‒temperature …
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Boiling heat transfer in porous media with/without chimneys
… in the porous corrosion deposits deal with two-phase flows with phase changes in heterogeneous porous media. This analysis further requires a basic understanding of boiling heat transfer in homogeneous porous media. Therefore, two-phase flows with phase changes in porous media without chimneys …
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Raman Spectroscopy and Synchrotron X-ray Diffraction Study of Lunar and Terrestrial Plagioclase Feldspar at High-Pressure and High-Temperature Conditions
… This dissertation seeks to better understand the phase changes in plagioclase when subjected to meteorite impact and fundamental information about impact cratering process. Shock features in plagioclase from Mistastin Lake impact structure, Canada, and Apollo samples returned from the Moon were …
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A novel sublimable mask lift-off method for patterning thin films
… use of a chemically inert resist that relies on phase changes for lift-off patterning thin films of organic semiconductors and metals.
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Modeling of melt pool thermal behavior in laser material
… place in the laser-material interaction, such as phase changes and the Marangoni effect. Since the melt pool dynamics is primarily driven by the interfacial forces, which in turn rely considerably on the melt pool geometry, a free surface tracking method associated with the numerical …
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The dynamic cutting of metals
… are given. The results show that there are large phase changes of cutting force relative to chip thickness when vibrating. A simplified criterion is given for assessing machining stability and it is shown that the observed phase changes will greatly affect machining stability; in some cases …
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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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Functional Spectral Domain Optical Coherence Tomography Imaging
… non-invasive backscattering amplitude and phase from a sample. Due to the translucent nature of the tissue, ophthalmic imaging is an ideal space for SDOCT imaging. </p><p>Structural imaging of the retina has provided new insights into ophthalmic disease. The phase component of SDOCT images …
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Controlling the sense of molecular chirality with light: Toward a liquid crystal optical switch
… chiral compounds that are capable of inducing phase changes in liquid crystals upon irradiation. The concept is based on control of chirality with light, a light-induced switching of the stereochemistry of a chiral molecule. This can be done in one of the two ways: photoresolution of a racemate …
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Alternative methods and materials for patterning organic thin film electronics
… lithography. These primarily include employing phase changes for lift-off patterning thin films of organic semiconductors and metals, and also propose and discuss the use of combustible and magnetic materials.
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In situ Raman spectroscopy of lanthanum-strontium-cobaltite thin films
… electrochemical applications. No structural phase changes were found in the research of this thesis, interesting effects in the surface regime were observed and possible explanations are offered. Future research should focus on resolving the surface regime via altered experimental set up. …
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Effect of polymorphic phase transformations within an alumina layer on the ignition of aluminum particles
… experimental conditions. The properties of and phase changes occurring in the alumina scale existing on the surface of aluminum particles at different temperatures are systematically studied. The mechanism of aluminum oxidation is quantified and a new simplified ignition model is developed. …
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Luminescence studies of photoexcited electron-hole plasmas in silicon and germanium
… as a function of uniaxial stress. This condensed phase of photoexcited carriers that forms in Ge and. Si has a high stability due to the degeneracies present in the band structure of the material. By applying <111> uniaxial stress to a Ge crystal, many of the degeneracies are lifted -altering the …
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Low coherence fibre optic Fabry-Perot sensors suitable for multiplexed strain measurement
… (WLI) techniques to measure the optical path changes produced in the sensors by the application of strain. Since thermal effects also produce phase changes in the fibre Fabry-Perot interferometer (FFPI) which are indistinguishable from strain changes the investigations have included both …
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Numerical simulation of forward combustion in a radial system
… heat losses to the surrounding formations, three phase fluid flow, conductive-convective heat transfer within the producing formation, combustion, and aqueous-phase changes considered. The mathematical form of the temperature equation requires that numerical solutions be obtained with a digital …
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Reactions of thin film bilayers of nickel on silicon-germanium alloys
… of the bilayers, yields information about changes in the whole electrically conductive volume of the film structure. In-situ X-ray Photoelectron Spectroscopy (XPS) is also done during vacuum annealing of the bilayer structure, and yields information about phase changes that occur at the …
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Experimental investigations of the thermodynamic properties of Nd-C and Ce-C binary systems for TRISO fuel applications
… provided new data to expand upon predicted phase change boundaries, with experimental phase changes exhibiting comparatively higher transition temperatures.
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Mechanochemical approaches to MOF glasses and the thermal response of amorphous MOFs
… as ZIF-8, from the mechanochemically amorphised phase. We solve the structure of this polymorph and investigate its porosity and thermal behaviour. The main points highlighted in this thesis include the importance of conducting thorough thermal analysis on ZIFs, and employing appropriate …
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