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 27 for “"Vortex-motion"”.
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Vortex motion and dynamical states in Josephson arrays
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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A Study of Narrowband Noise Characteristics Associated with Vortex Motion in High Temperature Superconductors
Vortex motion plays an important role in the transport properties of high Tc superconductors. In the presence of a sufficiently large applied current vortices will drift creating an ohmic resistance in the material, while defects in the material will tend to inhibit their motion. Some types of …
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Compressible Hydrodynamics of Few Body Optical Vortices
… fluid density and phase gradients at the vortex location. However, we find that these gradients alone are insufficient for describing vortex motion. Vortex ellipticity plays a crucial role in vortex dynamics in two-dimensional fluids, particularly during nucleation and annihilation events …
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Phase transitions and vortex dynamics in superconducting island arrays
… island arrays as a platform for studying vortex motion and quantum phase transitions. We investigate superconducting vortex dynamics and lattice structures in superconducting arrays by performing electrical transport measurements on Nb island arrays on Au at milli-kelvin temperatures and …
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Model reduction of linear and nonlinear systems using balancing methods
… filtering theory in the context of 2-point Vortex motion with inroads made towards the prospect of data fusion in regards to the data provided by a number of Lagrangian tracers.
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Near field behavior of reacting free jets
… elliptical jet exhibited out-of-plane vortex dynamics and subsequently, structure merging primarily contained within the minor axis region. Chemical reaction hindered out-of-plane vortex motion causing the reacting jet to form primarily planar vortex rings. The overall structure and …
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Trailing vortex free-surface interaction
An investigation of the interaction of a trailing vortex with a free surface has been undertaken for the purpose of understanding the origin and scars and striations. Velocity and turbulence measurements have been carried out through the use of a Laser-Doppler-Velocimeter (LDV) for various …
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Nonequilibrium interband phase textures induced by vortex splitting in two-band superconductors
… and its boundaries leads to the phenomenon of vortex splitting, which divides composite vortices and creates fractional ones. The interaction between vortices, attractive for different bands and repulsive for the same band, which is controlled by the electric current density flowing through the …
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Inhomogeneous 1H NMR spin-lattice relaxation in the organic superconductor κ-(BEDT-TTF)2-Cu[N(CN)2]Br
… Tc, these fluctuations take the form of bound vortex-antivortex pairs that have no long-range effect on the phase. At Tc, they undergo a Kosterlitz-Thouless unbinding transition; the unbound vortices destroy long-range phase coherence. Previously reported proton NMR measurements on this …
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Hall effect in untwinned single-crystal superconducting YBa2Cu307-y
… _y• Below Tc, we obtained information about vortex motion from the Hall effect and magnetoresistance. For example, we found that the Hall resistivity changes sign over a certain range of magnetic field and temperature below Tc, even in untwinned crystals. Thus this anomalous behavior, …
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Geostrophic vortex dynamics
By generalizing the method of contour dynamics to the quasigeostrophic two layer model, we have proposed and solved a number of fundamental problems in the dynamics of rotating and stratified vorticity fields. A variety of rotating and translating potential vorticity equilibria (V-states) in one …
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Quantized vortices in arbitrary dimensions and the normal-to-superfluid phase transition
… of superflow around quantized vortices, and the motion inherited by these vortices from this superflow, are explored in the general setting of a superfluid in arbitrary dimensions. The vortices may be idealized as objects of co-dimension two, such as one-dimensional loops and two-dimensional …
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Representation of eddies in climate models by a potential vorticity flux
… and momentum transporting properties of eddy motions for use in three-dimensional, primitive equation, z-coordinate atmosphere and ocean models. Determining the transport characteristics of these eddies is fundamental to understanding their effect on the large-scale ocean circulation and …
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Submesoscale coherent vortices in the deep Brazil Basin
… together. There is some evidence that the vortex cores may be enriched in warm, salty North Atlantic Deep Water, suggesting formation in the north or northwest regions of the basin. Data is available from 153 floats which were ballasted for 2500 and 4000 db pressures. They tracked 34 …
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Hall effect in the superconducting and normal states in detwinned and twinned single crystals of zinc-doped YBa2Cu3O7-d
… mixed state [1], the first term comes from the vortex motion's contribution, and the other term comes from the quasiparticles in the vortex cores. We found that absolute value of the coefficient C1 increased faster than (1-T/Tc) with decreasing temperature. The C2 coefficient was found to …
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Proximity effects and vortex dynamics in mesoscopic superconductor-normal metal-superconductor arrays
… temperature in 1D and 2D systems, the diffusive motion of electrons scattering off impurities ceases, and there is no long range electron transport. In other words, there are no metallic states at T = 0 in 1D and 2D systems. Although this theory has accurately described the low-temperature …
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Extracting energy from unsteady flows through vortex control
Vortex control is a new paradigm in fluid mechanics, with applications to propulsion and wake reduction. A heaving and pitching hydrofoil placed in a flow with an array of oncoming vortices can achieve a very high propulsive efficiency and reduced wake signature. The canonical example of flow with …
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Imaging vortex dynamics in Josephson arrays using magnetic force microscopy
Vortices and vortex lattices play a major role in determining the transport properties of type-II superconductors[1–3], and enable a platform to investigate exotic superconducting physics[4,5]. The study of vortex matter has generally focused on novel states in 2D films and structures, and has …
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Dynamics of vortices in complex wakes: modeling, analysis, and experiments
… complex laminar wakes which are formed behind vortex-shedding bluff bodies. These wake structures exhibit a variety of patterns as the bodies oscillate or are in close proximity of one another. The most well-known formation comprises two counter-rotating vortices in each shedding cycle and is …
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