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 37 for “"current distributions"”.
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Switching Current Distributions of Superconducting Nanowires: Evidence of Quantum Phase Slip Events
… order-parameter field between distinct current carrying states. Owing to these phase slips low-dimensional superconductors acquire electrical resistance. In quasi-one-dimensional nanowires it is well known that at higher temperatures phase slips occur via the process of thermal barrier …
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Macroscopic quantum tunneling in superconducting nanowire devices
… in these devices by measuring switching current distributions. It is known that the standard deviation of switching current distributions can be measured on a single nanowire to reveal temperatures at which macroscopic quantum tunneling is responsible for phase-slips. Therefore we begin …
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Numerically efficient analysis of microstrip configurations using closed-form Green's functions
… for which the thicknesses can be arbitrary. The current distributions are computed for a microstrip line terminated by complex loads, a microstrip line with right-angle bends, and microstrip patch antennas using the closed-form expressions for the spatial domain Green's functions in conjunction …
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Investigation of tapered multiple microstrip lines for VLSI circuits
… on the static solution to obtain the charge and current distributions on the lines at different frequencies. From this model, a frequency-dependent scattering parameter characterization is determined. Results for typical geometries are presented and are compared with those published by other …
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Ecomorphological differences between sister species, Rhinolophus capensis and Rhinolophus swinnyi
… in the ecomorphology of these bats in their current distributions. R. capensis is bigger than R. swinnyi, with corresponding differences in echolocation call signatures and wing morphology.
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Arbitrarily Oriented Biaxially Anisotropic Media: Wave Behavior and Microstrip Antennas
… moments. Galerkin's method is used to evaluate current distributions on gap-fed dipole antennas and probe-fed patch antennas. The resulting current distributions are used to compute antenna parameters such as input impedance, resonant length and principal polarization radiation patterns. For the …
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Analysis and modeling of microstrip antennas with electromagnetically coupled feeds
… representations for the patch and feedline current distributions, and input impedances are found by examining the current standing wave pattern along a portion of the feedline where the fields are quasi-transverse electromagnetic (quasi-TEM). Through this procedure, the computed input …
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The Development Of Biomagnetic Systems : Planar Gradiometers And Software Tools
… types of gradiometer in recovering test current distributions, using a distributed current analysis technique, is assessed. Secondly, four major software tools that are essential in the analysis of data from large multi-channel biomagnetic systems are presented. These tools are then used …
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Modal analysis of radiation and energy storage mechanisms on conducting scatterers
… of radiation and stored energy by electric currents on conducting bodies is studied via modal expansions. The novel modal expansions are based on the quadratic operators which map a current distribution to each quantity. Adaptations of the continuous forms of these operators into the Method …
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Distribution and Abundance of American Martens and Cougars in the Black Hills of South Dakota and Wyoming
… Hills of South Dakota and Wyoming. I predicted current distributions and estimated population sizes for both species in the Black Hills. Using geographical information system technology, I constructed and tested ranked habitat-relation models for martens and cougars in the Black Hills National …
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Identification and distribution of South Africa's non-native beachfleas (Crustacea: Amphipoda: Talitridae)
… in order to determine the correct historical and current distributions of both species. It was found that historically and still today O. gammarellus occurs in Langebaan Lagoon. Its other current known distribution is the Berg River Estuary, Milnerton Lagoon and the Bushman's River; it never …
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Synthesis of Optimal Arrays For MIMO and Diversity Systems
… are produced in terms of radiating current distributions along with their resulting radiation patterns. The results reveal that the optimal antennas can provide significantly more diversity gain than that provided by a simple practical design. Computational examples illustrate the …
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Characteristic mode theory for closely spaced dipole arrays
… such as element input impedance and array current distributions for beam scanning and sidelobe reduction. The modes are then calculated and interpreted for higher order dipole resonances to understand their behavior over a wide frequency band. Lastly, the modes of a dipole array with a …
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Probing quantum phase slips in superconducting nanowires modified using high bias voltage pulses
… establishing MQT in JJs. By measuring switching current distributions, we can probe the phase slip rate and determine if it corresponds to thermal activation or quantum tunneling. Having established that the behavior we see is consistent with being in the quantum regime, we can alter properties …
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Frequency Selective Detection of Infrared Radiation in Uncooled Optical Nano-Antenna Array
… array which trap incident radiation as dipole currents. The energy is dissipated as electron plasma loss on the hole-disk system inducing close to ~100% absorption of the incident radiation. This near perfect absorption originates from simultaneous zero crossing of real component of …
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Thermal activation of superconducting Josephson junctions
… interference devices (SQUIDs) and in persistent-current qubit systems. Noise excitations, however, have a critical influence on their dynamics. Thus, the primary focus of this research was to investigate the effects of thermal activation on the superconducting properties of Josephson junctions. …
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The phylogeography of North American chestnuts and chinquapins (Castanea Mill., Fagaceae)
… geographic range, allowing for the comparison of current distributions with locations of possible glacial refugia. Although the precise genetic basis of the confounding morphology in southeastern populations of North American Castanea is still uncertain, an intricate biogeographical history …
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Characterizing and using defects in high-temperature superconductor cables and magnets
… cables and magnets are enabling a range of high-current and high-field applications, including compact fusion devices aiming to achieve net energy. Defects in HTS pose manufacturing, cost, and operational challenges. A rigorous understanding and predictive capability for defect-induced behavior …
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Influences of Historical and Contemporary Environmental Conditions on Threatened and Endemic Aquatic Organisms
… the degree to which conditions have impacted current distribution and population structure of fishes and mussels. The first chapter assesses genomic hybridization dynamics between the endemic and threatened Macrhybopsis australis and the widespread M. hyostoma in the Red River basin of Texas. …
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