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 226 for “"depolarization"”.
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Rain depolarization scatter prediction
… extends an existing mathematical model of rain depolarization and attenuation to include the expected variances as well as the usually predicted mean values. It emphasizes depolarization and develops data for waves with frequencies ranging from 4 to 34.8 GHz propagating in rain cells which vary …
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Dynamics of biological macromolecules investigated by fluorescence depolarization
… to their physiological function. Fluorescence depolarization is a powerful technique for the investigation of these dynamics. A general overview of the use of time-resolved fluorescence to investigate nanosecond dynamics is presented. The basic theory and experimental techniques for measuring …
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Dynamics of biological macromolecules investigated by fluorescence depolarization
… to their physiological function. Fluorescence depolarization is a powerful technique for the investigation of these dynamics. A general overview of the use of time-resolved fluorescence to investigate nanosecond dynamics is presented. The basic theory and experimental techniques for measuring …
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Thermally stimulated polarization and depolarization current (TSPC/TSDC) in glass
… using thermally stimulated polarization (TSPC)/depolarization current (TSDC) techniques was investigated with 4Na₂O·96SiO₂ and 30PbO·70SiO₂ (mol%) glasses. The TSDC peaks in these glasses were dependent on glass composition and attributed to bulk polarization. The high temperature background …
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Fluorescence Depolarization Study of Internal Tryptophan Mobility in Hydrated Azurin Films
… was investigated using steady state fluorescence depolarization on azurin, which has a single tryptophan residue well-buried in the hydrophobic interior. Azurin was imbedded in a thin, solid, water-permeable polymer film. This procedure inhibited whole-protein motion while allowing examination of …
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Fluorenscence depolarization study of internal tryptophan mobility in hydrated azurin films
… was investigated using steady state fluorescence depolarization on azurin, which has a single tryptophan residue well-buried in the hydrophobic interior. Azurin was imbedded in a thin, solid, water-permeable polymer film. This procedure inhibited whole-protein motion while allowing examination of …
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Modulation of Kras Structure and Dynamics By Kras Ubiquitination and Membrane Depolarization
… by which monoubquitination and membrane depolarization affected KRAS structure and dynamics and its interactions with regulators, effectors, and the membrane.</p> <p>KRAS undergoes monoubiquitination at two sites, Lys104 and Lys147. We observed that ubiquitin is quite dynamic around KRAS …
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The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes
The mechanism of the corrosive action of sulphate reducing bacteria of the genus Desulfovibrio towards ferrous metals has been investigated. This corrosive action is anomalous when considered in the light of established knowledge of corrosion processes, since it occurs in the absence of oxygen, at …
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Ventricular Depolarization in Ischemic Heart Disease.Value of Electrocardiography in Assessment of Severity and Extent of Acute Myocardial Ischemia.
… objective was to increase the understanding of depolarization changes during myocardial ischemia and to evaluate whether these changes have possible clinical implications in patients with acute MI. Different QRS methods are applied in patients during ischemia produced by elective, prolonged PCI …
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Sustained Depolarization of the Resting Membrane Potential Regulates Muscle Progenitor Cell Growth and Maintains Stem Cell Identity in vitro
… focused on elucidating the impact of sustained depolarization on MPC growth and differentiation in vitro. Cultures were treated with either potassium gluconate or the sodium-potassium pump blocker ouabain and evaluated for proliferation, DNA content using propidum iodide staining, and expression …
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The Role of Temperature in the Preparation and Viability of Rodent Brain Slices, and Propensity to Evoke Spreading Depolarization
Following an ischemic stroke, recurrent spreading depolarization (SD) propagates across the higher grey matter of the brain and is the primary contributor to acute neuronal injury. Within minutes of the brain being deprived of oxygen and glucose (OGD), Na+/K+ pumps on neuronal membranes fail and …
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Temporal evolution of intracellular signaling and gene expression following patterns of membrane depolarization in the pheochromocytoma cell line, PC 12
… the effects of different patterns of membrane depolarization on undifferentiated pheochromocytoma (PC 12) cells. In response to chronic depolarization, cytoplasmic free Ca2+ ([Ca2+]i) levels increased transiently, then decreased to intermediate levels that were maintained for more than 90 …
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Rain attenuation and depolarization along 10 to 30 GHz earth space links predicted from s-band dual-polarized radar measurements
This thesis presents the computer model FORWP that is capable of predicting attenuation and cross polarization at 10-30 GHz from dual-polarization radar data with a high degree of accuracy. FORWP uses a rigorous backscattering computer model BSCAT to infer rain drop size distribution along the …
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Theoretical Investigation of Two-Color, Two-Photon, 6s(2)S(1/2) → 5d(2)D(j) → 11p(2)P(3/2) Excitation and Depolarization Spectra in Atomic Cesium
… of two-photon, two-color intensity and depolarization spectra for the 6s<sup>2</sup>S<sub>1/2</sub> → 5d<sup>2</sup>D<sub>j</sub> → 11p<sup>2</sup>P<sub>3/2</sub> transition in atomic caesium is considered. For quadrupole-dipole transitions the dependence of excitation from the ratio of …
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Statistical correlation as a tool in propagation studies
… patterns usually appears. Ice-crystal depolarization produces a pattern of near zero attenuation coefficients and varying isolation coefficients. Rain produces a correlation pattern in which the attenuation coefficient pattern is nearly mirror image of the isolation coefficient pattern. …
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A simple model for the depolarizing effects of rain and ice on earth satellite links in the 10 to 30 GHz frequency range
… in the form of rain and ice leads to significant depolarization and attenuation of dual polarized signals above about 10 GHz. The depolarization versus attenuation relationship is examined in depth using a rigorous multiple scattering model. This relationship for rain is expressed in the form of a …
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Focused orientation of campaniform sensilla on Periplaneta americana L. (Orthoptera: Blattidae) trochanters and femurs
… of campaniform sensilla fields suggests that depolarizations originating from each field are integrated. Intra- and inter-field functional integration is suggested by the frequency of parallel and series campaniform sensilla orientations. Although several campaniform sensilla are focused in …
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Three-dimensional magnetic domain imaging with polarized neutrons
… fields. This study experimentally tested the depolarization of neutrons in five different materials with known magnetic order using PONTO, an instrument at Helmholtz-Zentrum Berlin (Germany) that uses a polarization-sensitive filter and analyzer to measure neutron depolarization in magnetic …
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Multiple scattering of electromagnetic waves by distributions of particles with applications to radio wave propagation through precipitation
… particles. The above equation is applied to ice depolarization and rain attenuation and depolarization. Twersky's procedure is then extended in order to derive a vector-valued Dyson equation and a tensor-valued two-frequency BetheSaltpeter equation for waves propagating in a distribution of …
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