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 11 of 11 for “"local phase"”.
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Topics in the Theory of High-Temperature Superconductors
… lies in the intriguing properties of the global phase diagram of the cuprate materials. In particular, strongly underdoped cuprates exhibit antiferromagnetic order, whereas moderately underdoped cuprate superconductors exhibit a pseudogap in the excitation spectrum above the superconducting …
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A numerical study of barotropic instability of a zonally varying easterly jet.
… a simple mechanistic analytical model using the local phase speed and growth rate concepts. The results are grossly similar in several respects to that expected from the parallel flow theory of barotropic instability, however, the resultant structure of the waves causes a spatial growth rate …
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Electromagnetics in characterizations
… preprocessing is used to reduce the effects of local phase inconsistencies caused by noise. By incorporating the information of the ground control points in the height inversion process, the initial estimation of the baseline parameters based on the satellite state vectors and the commonly used …
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Revealing and analyzing imperceptible deviations in images and videos
… we leverage the complex steerable pyramid, a localized version of the Fourier transform, whose notion of local phase can be used to process and manipulate small motions or changes from stillness in videos. In the second case, we find hidden geometric deformations in images by localizing edges …
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Textural features for fingerprint liveness detection
… textural algorithms. I first used the LBP (Local Binary Pattern) algorithm and then I worked on the introduction of the LPQ (Local Phase Quantization) and the BSIF (Binarized Statistical Image Features) algorithms in the FLD field. In the last two years I worked especially on what we called …
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Evaporating cross flow spray jets in gas-solid circulating fluidized bed
Three-phase flow of solid-gas suspension with liquid spray is found in many industrial applications, including fluidized catalytic cracking in petroleum refinery process, and wet scrubbing process. This dissertation study is aimed to understand the gas-solid-liquid three-phase flow structure, phase …
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Time Reparametrization Symmetry and Spatial-Temporal Fluctuations in Glasses
… glasses.</p><p>We then investigate fluctuating local phases and fluctuating local relaxation times in structural glasses. The presence of fluctuating local relaxation times, <span>\tau_{r}(t)</span> has been used for some time as a conceptual tool to describe dynamical heterogeneities in …
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Probing nano-scale atomic and electronic structures of iron-based superconductors
… BaFe2(PxAs1-x)2, we discovered nanometer-scale phase separation associated with chemical inhomogeneity. Direct evidence of phase separation was obtained from the Z-dependent image contrast recorded in a scanning transmission electron microscope (STEM) using a high angle annular dark field …
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Concurrent evaporating spray jets in dilute gas-solid pipe flows
… exploring fundamental mechanisms of the multi-phase interactions with heat and mass transfer as there are few reported studies on this topic. This study is aimed at better understanding the phase interactions and microstructures of concurrent evaporating spray jets in gas-solids pipe flows. A …
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Deformation mechanisms in a polycrystalline Ni-based superalloy
… process, e.g. from simultaneous SF and antiphase boundary (APB)-coupled shear to predominantly APB-coupled shear to microtwinning. In the finer γ′ microstructure, yield strength increased at higher temperatures. As this microstructure was more prone to SF shear, the elevated strength was …