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 36 for “"Spin-down"”.
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Spin-down of a stratified, rotating fluid,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1974.
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Measurement of Continuum Breakdown Using a Disc Spin-Down Experiment in Low Pressure Air
… few experimental measurements of continuum breakdown in boundary layer flows exist. All experimental measurements of the TMAC in macro-scale boundary layer flows have been done in the continuum slip and the transition flow regimes. Moreover the experimental apparatus used by previous researchers …
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An analysis of a developing and non-developing disturbance during the predict experiment
… of Karl are used to describe the system-scale spin-up within the marsupial paradigm frame-work. The circulation tendency shows that Karl underwent periods of spin-up and spin-down until its eventual development on 14 September. These spin-up and spin-down episodes correspond with the cycle of …
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A Study of Dynamical and Emission Variabilities in Pulsars
… shown that these emission changes effect the spin dynamics, particularly the spin-down rate. This indicates that pulsar emissions are even more complex than previously thought. The goal of this thesis is to apply new analysis techniques to help shed light on the pulsar emission problem.;Over …
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Naval applications of enhanced temperature, vibration and power monitoring
… using vibration analysis during the machine's spin-down. A method to determine the thermal storage capacity of a structure, so that HVAC loads can be more effectively managed, is also explained. Finally, the potential impacts of a Non-Intrusive Load Monitor (NILM) on a ship are investigated.
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Accretion by rotating magnetic neutron stars
… 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 sufficiently high stellar angular velocities or sufficiently low accretion rates, the above coupling dominates that due to the plasma and the magnetic …
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Gravitational radiation detectability of supernova 1987A's remnant fully matched filter for double resonant gravitational detector
… we can determine important parameters of the spinning neutron star as rotation frequency, precession frequency and spin-down rate. The neutron star is believed to spin down due to the emission of gravitational waves. We give a precise calculation of the strain value of the gravitational waves …
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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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X-ray timing of the accreting millisecond pulsar SAX J1808.4-3658
… shape variability limits the ability to measure spin frequency evolution within a given X-ray outburst (and calls previous zi measurements of this source into question), with typical upper limits of Jil < 2.5 x 10-14 Hz s-1 (2a). However, combining data from all the outbursts shows with high (6 …
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A systematic periodicity and time-variable modulation search in RXTE ASM data : methods, findings, and implications for astrophysical X-ray sources
… low-mass X-ray binary GX 9+9 and the recent spin-down event of the pulsar in the high-mass X-ray binary X0114+650, are reported. These searches employed new methods of periodicity detection that employed an algorithm to reduce the effects of low frequency noise from X-ray sources. We discuss …
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Magnetic Coupling between a “Hot Jupiter” Extrasolar Planet and Its Pre-Main-Sequence Central Star
… out the planet during its inward migration and spin-down the star's angular rotation. This investigation shows that the magnetic torque is a viable mechanism to explain the short period pile-up of many extrasolar planets.</p>
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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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Fluid Agitation Studies for Drug Product Containers Using Computational Fluid Dynamics
… these undesired particles using a high speed spin-stop agitation process. To better understand the fluid movements to swirl the particles away from the walls, Computational Fluid Dynamics (CFD) is used to analyze the nature of the two phase flow of air and a liquid solution.</p> <p>Several 2-D …
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K-Star rapid rotators and the detection of relatively young multiple K-Star systems
… the 14,440 K star targets is consistent with spin evolution models that presume an initial contraction phase followed by spin down due to magnetic braking where typical K stars would be expected to spend up to a few hundred million years before slowing down to a rotation period of more than 2 …
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Effects of a single magnetic impurity on superconductivity
… A magnetic impurity tends to align the spins of the neighboring electrons and break up Cooper pairs, and has similar effects of lo- cally suppressing superconductivity. A striking difference, however, from the vortex problem is that around a magnetic impurity there is particle-hole …
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Spin and lattice properties of optically trapped exciton polaritons
… can be created. This thesis shows that the spin properties of polariton condensates are strongly modified by such trapping. Under linearly polarised pumping, helicity can spontaneously develop at a critical occupation, breaking the parity symmetry. This formation of spin-up/spin-down …
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Atmospheric interactions with Gulf Stream Rings
… interactions. First, we compute the forced spin down of a Gulf Stream Ring. The variations in surface stress across the Ring necessary to spin it down are caused by the variations in relative air-sea velocity, of which the stress is a quadratric function. From numerical simulations, we find …
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Discovering and characterising compact mergers in wide-field surveys
… of an additional powering source, such as the spin-down of a magnetic neutron star remnant, to provide a plausible model fit to the bolometric lightcurve. Spectral modelling suggests the object is characterised by intermediate mass elements (including oxygen, silicone and magnesium) which …
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Magnetospheres of neutron stars accreting from disks
… I also discuss the maximum pitch and largest spin-up and spin-down torques that can be supported by the magnetic field.
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Rossby waves and two-dimensional turbulence in the presence of a large-scale zonal jet
… numerical simulation experiments of both the spin-down and forced-dissipative equilibrium variety. In particular, the nature of the wave, mean-flow interaction can be identified by examining the interaction terms as functions of the meridional wavenumber X for fixed k. In so doing one can …
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