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 “"Surface mode"”.
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Superfluid helium on solid hydrogen
… We observe, in addition to third sound, a new surface mode of wave propagation in superfluid films. On a D$\sb2$ substrate, we observe a similar phase diagram as on H$\sb2,$ though only the third sound mode is seen.
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Fluctuation-mediated interactions of atoms and surfaces on a mesoscopic scale
… properties of metals on the electromagnetic surface noise, with applications to atomic trapping in atom-chip setups and quantum computing, and on the magnetic dipole contribution to the Van der Waals-Casimir-Polder potential in and out of thermal equilibrium. In both cases, the particular …
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Novel ground states of Bose-condensed gases
… size, vortices were either nucleated at discrete surface-mode resonances (large beams) or over a broad range of stirring frequencies (small beams). Additionally, the dynamics of the lattices have been studied at finite temperature by varying the condensed fraction of atoms in the system. The decay …
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Quantifying microbubble streaming and its applications
… of the interface, and (ii) results in much wider surface-mode frequency resonance peaks than is nominally predicted by potential flow theory. The oscillatory dynamics then feed into a calculation of the secondary flow, which rigorously accounts for boundary layers over the bubble and the wall. We …
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Photon management in thermal and solar photovoltaics
… absorption in silicon nanowire structures, surface-plasmon enhanced near-bandgap optical absorption in silicon, and selective absorber surface for solar thermal applications. For thermophotovoltaic systems, the work is focused on thermal emission and photon transport. The study of photon …
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Instability of Dielectric Elastomer Actuators
… dielectrics undergo finite strains, and their modelling requires a formulation based on the Mechanics of Solids at large deformations. A major problem that limits the widespread diffusion of such devices in everyday technology is the high voltage required to activate large strains, because of …
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Mechanisms, Conditions and Applications of Filament Formation and Rupture in Resistive Memories
… of various thicknesses of oxides, a resulting model supported by the data postulates that there are two distinct modes of creating oxygen vacancies: i) a conventional bulk mode creation, and ii) surface mode of creating oxygen vacancies at the active metal-dielectric interface. A further …
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Enhanced Light-Matter Interactions in Complex Photonic Systems
… enables strong nonlocal coupling between a dark mode and a brighter surface mode, which offers new opportunities for efficient sensing and Raman scattering.</p> <p>Introducing complexity in the material constituents together with deliberate spatial designs, we further explore how nonlinearities …
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SPIN WAVES AND PHASE TRANSITIONS IN FERROMAGNETIC SUPERLATTICES
… such as man-tailored superlattice materials, surface and interface condition probe etc. In this dissertation, the spin waves in both magnetostatic region and exchange region, as well as phase transitions in Ising Model for ferromagnetic superlattices are studied. A new method of recurrence …
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The harmonic excitation of a cylindrical bubble pinned to a plane surface: flow field and oscillation dynamics
… based on the boundary conditions at the bubble surface and at the wall. We show that the shape of the bubble oscillations must depend on the Stokes boundary layer thickness, both close to and away from the wall. We discuss also the implications of the oscillatory flow on the steady streaming. We …
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Stress Effects on Phase Morphological and Compositional Non-uniformity in Intercalation Compounds
… interface could be destablized by two different modes of perturbation, i.e. surface vs bulk mode. While the surface-mode interface perturbations could be suppressed when interface moves far away from particle surface, unstable bulk-mode perturbations persist throughout the (de)intercalation …