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 45 for “"Spin-up"”.
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Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields
… A particular area of interest deals with the "spin-up" mechanisms of ferrofluids, which describe how a container of ferrofluid comes to a steady state of bulk flow when subjected to a uniform rotating external magnetic field. There are two prevailing theories that attempt to explain the spin-up …
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An experimental study of the spin-up of a stratified fluid.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1971.
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Ferrofluid spin-up flows from uniform and non-uniform rotating magnetic fields
… azimuthally directed magnetic field, the fluid "spins up" into an almost rigid-body rotation where ferrofluid nanoparticles have both a linear and an angular "spin" velocity. Flow observations are often limited to the ferrofluid free surface due to the opaque nature of the ferrofluid and the …
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An analysis of a developing and non-developing disturbance during the predict experiment
… air in the failed redevelopment. The findings support the hypothesis that entrained, dry air near 600 hPa thwarted convective updraughts and vertical mass flux, which in turn leads to a reduction in vorticity and a compromised pouch at these middle levels. A compromised pouch allows further …
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Error behavior and optimal discretization of chaotic differential equations
… errors are generally one of two types: transient spin-up error before the system reaches the attractor (i.e. the stationary distribution of long-run states) and sampling error due to finite-time averaging of trajectories on the attractor. In this work, we first propose an error model to describe …
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Ferrofluid surface and volume flows in uniform rotating magnetic fields
… shapes and resulting surface driven flows, spin-up flows, and Hele-Shaw cell flows and instabilities. To characterize the water-based and oil-based ferrofluids used in experiments, measurements were made of the magnetization curve, surface tension, viscosity, density, and the speed of sound. …
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Ferrohydrodynamic flows in uniform and non-uniform rotating magnetic fields
… and measurements of ferrofluid torque and spin-up flow profiles. To characterize the water-based and oil-based ferrofluids used in the experiments, measurements were made of the mass density, surface tension, viscosity, magnetization curve, nanoparticle size, and the speed of sound. Initial …
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Effect of Loss-Cone-Like Scattering Transport on Particle Confinement and Rotation in the Field-Reversed Theta Pinch
… encountered rapid particle losses and plasma disruption after a period of increasing rotation frequency. The objective of the present research was to develop theoretical models to explain the phenomena and simultaneously explore ways to reduce losses and spin-up.
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Formation and dynamics of the Galactic disc and halo
… (Sgr) on stellar streams produced by tidally disrupting globular clusters, with a focus on the GD-1 stream. This reveals a plethora of perturbations that may result from interactions with a massive Sgr, including asymmetry and folding of the tails. In Chapter 3 I run simulations of a stellar …
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Accretion by rotating magnetic neutron stars
… torque on the star. We show that the magnetic coupling between the star and the plasma outside the inner edge of the disk makes an appreciable contribution to the accretion torque, and that the spin-up torque on fast rotators is substantially less than that on slow rotators as a result. For …
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Disk Accretion to Rotating Magnetized Stars: Magnetohydrodynamic Simulations
… star. It was proposed that the ralation between spin-up torque arising from the magnetic connection of the star to the fast rotating inner part of the disk, and the spin-down torque arising from the connection of the star to the slow rotating outer part of the disk determines the spin evolution …
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Evaluating the Skillfulness of the Hurricane Analysis and Forecast System (HAFS) Forecasts for Tropical Cyclone Precipitation using an Object-Based Methodology
… with lead time were also investigated. The model spin-up negatively impacted the model skill up to six hours at the 2 mm/hr threshold and up to three hours at the 5 mm/hr threshold, and the skill was not affected by the spin-up at the 10 mm/hr threshold. This indicates that the model took longer …
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Europium oxide as a perfect electron spin filter
Essential to the emergence of spin-based electronics is a source of highly polarized electron spins. Conventional ferromagnets have at best a spin polarization P-50%. Europium monoxide is a novel material capable of generating a highly spin-polarized current when used as a tunnel barrier. EuO is …
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Continuum modeling of polarizable systems
… magnetic fields, including the effects of couple stresses. We obtain analytical expressions for the translational and spin velocity profiles, vorticity profiles, volumetric flow rate, and the shear force on a moving duct surface, comparing the effects of various boundary conditions for the …
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Effects of a single magnetic impurity on superconductivity
Electronic structure of a conventional superconductor in the vicinity of a single, iso- lated magnetic impurity has been probed experimentally with scanning tunneling spectroscopy by Yazdani et al.. Motivated by their experiment, we study the ef- fects of a single magnetic impurity on …
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Spin and lattice properties of optically trapped exciton polaritons
… excitations arising from the strong coupling of quantum well excitons and cavity photons in semiconductor microcavities. They are compound bosons for which stimulated scattering and macroscopic occupation of single quantum states can occur at sufficiently high densities. One way of …
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Testing the attitude determination and control of a CubeSat with hardware-in-the-loop
… Atmospheric Satellite (MicroMAS), a dual-spinner 3U CubeSat, is used as a case study to demonstrate both the overall methodology and the validation model. Laboratory experiments were performed with a one-degree-of-freedom rotation test set-up inside of a Helmholtz Cage magnetic field …
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Lifshitz transitions in RCo5 (R=Y, La) and in Osmium
… Here, an extraordinarily large peak in the spin-up part of the DOS, which is caused by a nearly dispersionless band in the hexagonal plane, crosses the Fermi level under a pressure of about 21 GPa. Thus, the spin-up 3d states become partly depopulated, which results in a drop of the total …
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Método atômico para o modelo de Anderson em presença de um campo magnético externo.
… into two localized levels, everyone depending on spin xq s and related to the spin up and down channels. Therefore, the problem is parametrized by xq"(#), and every spin channel need to be found self consistently in a way that a generalized Friedel sum rule, that takes into account the magnetic …
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A case study of the formation of an Eastern Pacific tropical cyclone
… that the low-level vortex formed from the spin-up of the monsoon trough, independent of the mid-level vortex.
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