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.
Results
Showing 1 to 20 of 23 for “"proximity effects"”.
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Superconducting Proximity Effects and Josephson Coupling in CoFeB Structures
This thesis presents experimental results that assess the suitability of a ferromagnetic cobalt-iron-boron alloy (CoFeB) for further research and application in ‘superconducting spintronics’ - the field that aims to utilise the distinct physics arising at interfaces between superconducting and …
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Josephson coupling and proximity effects through helimagnetic rare earth interfaces
This thesis presents research on the effect of superconducting-helimagnetic heterostructures. First, the electric and magnetic properties of epitaxial Nb(20 nm)/HoDy(40 nm) bilayers are studied. The saturation magnetisation values are consistent with previously reported values for Ho and Dy. The …
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Proximity effects and vortex dynamics in mesoscopic superconductor-normal metal-superconductor arrays
"Anderson's scaling theory of localization has proven invaluable in characterizing the behavior of real systems, that is, those possessing any amount of disorder. The theory predicts that, at zero temperature in 1D and 2D systems, the diffusive motion of electrons scattering off impurities ceases, …
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Complex-induced proximity effects in proton transfer and halogen-metal exchange reactions
Reactions in which there is formal intramolecular transfer of an acidic deuterium to a site of halogen-lithium exchange could be interpreted to show that initial halogen-lithium exchange occurs faster than loss of the acidic deuterium. However studies of the competition between halogen-metal …
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Spin-triplet proximity effects in magnetically controlled heterostructures with s-wave superconductors
… (SSVs), in which the thin film superconductor is proximity-coupled to two ferromagnets. Evidence of triplet generation is provided through *T*<sub>C</sub> measurements as a function of the magnetisation angle between the two ferromagnets. A maximum suppression in *T*<sub>C</sub> was obtained when …
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Group size and proximity effects on computer-mediated idea generation: A laboratory investigation.
This dissertation investigated the effects of group size, group member proximity and the interaction of these two variables on the performance of brainstorming groups in a synchronous, computer-mediated environment. A laboratory experiment was employed to manipulate the independent variables group …
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Magnetic structures and proximity effects in rare-earth / transition metal ferromagnetic and superconductor systems
The antiferromagnetic coupling between a rare-earth (RE) and a tran- sition metal (TM) ferromagnet can be exploited to engineer normal state and superconducting functional devices. RE/TM ferromagnetic multi- layers were previously used as spin-mixers to generate spin-triplet su- percurrents. This …
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Sub-10-nm electron-beam lithography for templated placement of colloidal quantum dots
… Sub-10-nm structures were fabricated and proximity effects were evaluated in both conditions. As an application of sub-10-nm EBL, this thesis presents a templated-self-assembly technique to control the position of individual colloidal quantum dots smaller than 10 nm.
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Low-voltage spatial-phase-locked scanning-electron-beam lithography
… at higher voltages, LVEBL has minimal proximity effects and is not resolution-limited by these effects. The fabrication of ultra-thin photoresist grids is investigated and the secondary electron signal levels of these grids are measured.
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PROTON BEAM WRITING OF MICRO/NANO FLUIDIC DEVICES FOR DNA ANALYSIS AND PARTICLE SEPARATION
… penetrate a photoresist very deep with minimal proximity effects allow us to fabricate 3D high aspect ratio molds.
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Low-loss inductor design for high-frequency power applications
… At these frequencies, losses due to skin and proximity effects are difficult to reduce, and gaps needed to keep B fields low in the core add fringing field loss. This thesis aims to improve the design of HF inductors. A low-loss inductor structure for HF applications and associated design …
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Proximity effect in superconductors: Experimental and theoretical determination of the transition temperature
… and theoretical investigations of the proximity effect in superconductors, with particular reference to the measurement and prediction of the transition temperature of superimposed films. The theoretical work consists of two parts: (1) an extension of the diffusion approximation theory …
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Mitigation of Asymmetrical Currents in Permanent Magnet Synchronous Machine with Unbalanced Stator Winding Impedance for Electric Vehicle Application
… additional losses in the motor due to skin and proximity effects, vibration and noise, uneven heating of the motor phases, and torque ripple appear in the PMSM drive. These effects reduce the reliability, efficiency, and lifespan of the machine. The conventional proportional-integral (PI) …
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Gorilla-Visitor Interface at a Zoo Exhibit: Positioning Effects of Western Lowland Gorillas (Gorilla gorilla gorilla) and Zoo Visitors
… in a zoo environment. The effect of gorilla proximity to visitor viewing areas on visitor attentiveness was examined in indoor and outdoor gorilla exhibits. Visitor experience surveys were collected from visitors exiting the outdoor exhibit. Stepwise multiple regressions revealed group and …
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Numerical methods for frequency dependent line parameters with applications to microstrip lines and pipe-type cables
… to calculate line parameters because of skin and proximity effects. A common strategy is to apply the subdivision principle — to subdivide the line conductors into smaller parts so that the traditional formulae may be used. Based on this strategy, new numerical methods have been developed in this …
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Hydrogenation of monolayer graphene in the diamond anvil cell and supercritical phenomena in methane
… Frenkel line or by critical point proximity effects described by Widom in the 1960s. The Raman discontinuity is not observed at 523 K, suggesting that alternative methods must be employed to conclusively determine the presence (or absence) of the Frenkel line.
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Delta-gap port model for surface-volume-surface electric field integral equation
… behaviour in the presence of skin-, corner- and proximity-effects makes it an attractive alternative to the classical EFIE solutions for antenna analysis and circuit characterization.
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The Effects of Geography and Proximity on Board of Directors: An Exponential Random Graphs Approach
… dissertation aims at exploring how physical proximity, among other geographical elements, affects the synthesis of boards of directors, the decisions executives make, and, in general, organizations. Drawing on the rich literature in economic geography, these studies focus on re-evaluating the …
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