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 68 for “"Magnetic Energy"”.
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Clamp–On Magnetic Energy Harvesting
… and waste problems associated with batteries. Energy harvesting offers an exciting solution to the battery problem, enabling circuits that can power themselves on-site from available ambient energy. Magnetic energy harvesters, configured as current transformers (CTs), extract energy from the …
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Coronal magnetic energy release by current sheet reconnection
… this thesis we investigate the rapid release of energy in the solar corona, with a particular view to understanding the solar flare in which magnetic reconnection is thought to play a key role. A review of existing reconnection solutions is given in Chapters 2 and 3, with new analytic and numeric …
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Core Material Evaluation for Magnetic Energy Harvester Applications
Current transformer magnetic energy harvesters (CTMEHs) harvest magnetic energy from an AC current-carrying conductor and convert this energy into usable electrical energy for use by various low-power devices, such as sensors and microcontrollers. The amount of power harvested by CTMEHs is …
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Magnet design considerations for superconductive magnetic energy storage
Superconducting Magnetic Energy Storage (SMES) offers many advantages over conventional forms of energy storage. The higher unit costs of SMES make it economically feasible only for large-scale applications (5000 MWh or more). Early studies showed that low aspect ratio solenoids have the lowest …
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Applications of superconducting magnetic energy storage systems in power systems
A Superconducting Magnetic Energy Storage (SMES) system is a very efficient storage device capable of storing large amounts of energy. The primary applications it has been considered till now are load-leveling and system stabilization.This thesis explores new applications/benefits of SMES in power …
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Superconducting magnetic energy storage for power system stability and quality enhancement
… Concerns over climate change are now moving the energy sector into a new era of modern power grids. To sustain the reliable operation of power systems and improve the quality of power generation, several instability issues that affect the quality of the operation of power systems are addressed in …
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Integrated cryogenic refrigeration system design for superconducting magnetic energy storage systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Impacts of superconducting magnetic energy storage unit on power system stability
… investigates the impacts of superconducting magnetic energy storage (SMES) unit on the power system first-swing stability by the impedance model of the SMES unit and EMTP simulations. The impedance model of the SMES unit is established in this thesis for study purpose. It has been concluded …
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Magnetostatic Modelling and Measurement for Particle Dynamics of a Magnetic Energy Filter
… the modelling and measurement of electromagnetic fields in a filter designed to selectively filter low-energy electrons from beams produced by electron sources. Two electron source configurations—based on a direct current (DC) 0.5 MeV electron gun and a 3.5 MeV radio frequency (RF) …
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Analysis of the Power Conditioning System for a Superconducting Magnetic Energy Storage Unit
Superconducting Magnetic Energy Storage (SMES) has branched out from its application origins of load leveling, in the early 1970s, to include power quality for utility, industrial, commercial and military applications. It has also shown promise as a power supply for pulsed loads such as electric …
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A Power Conditioning System for Superconductive Magnetic Energy Storage based on Multi-Level Voltage Source Converter
… conditioning system (PCS) for superconductive magnetic energy storage (SMES) is developed and its prototype test system is built and tested. The PCS uses IGBTs for high-speed PWM operation and has a multi-level chopper-VSC structure. The prototype test system has three-level that can handle up …
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Relationship between photospheric magnetic fields and coronal activities
… known to be related to the evolution of surface magnetic fields. This dissertation studies the evolution of photospheric magnetic fields and flow fields and their relation to the properties of these two coronal emission components. The key issue in the study of the steady coronal emission is the …
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Energy storage in reconfigurable antennas
… antennas is often strongly influenced by energy storage effects. Many antenna types achieve their performance characteristics through a careful balance of electric and magnetic energy storage. The distinct effects of magnetic and electric energy storage convey important information about …
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Activation volumes of carbon diffusion in F.C.C. iron-nickel alloys
… of ΔV is satisfactorily reproduced by a magnetic energy continuum model in which it is assumed that the activation free energy of diffusion is essentially ferromagnetic in origin "--Abstract, page iii.
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MODELING OF PLASMA-SHEET CONVECTION: IMPLICATIONS FOR SUBSTORMS (MAGNETOSPHERE)
… is suggested to the question of why plasma and magnetic energy accumulate in the Earth's magnetotail to be released in sporadic events, namely substorms. It is shown that the idea of steady convection is inconsistent with the idea of slow, approximately lossless, plasma convection in a long, …
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Catastrophe Model for the Onset of Fast Magnetic Reconnection
Solar flares, magnetic substorms and sawtooth crashes in fusion devices are explosive events in which magnetic reconnection facilitates the rapid release of energy stored in stressed magnetic fields into the surrounding plasma. Much effort has gone into understanding how the energy is released so …
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Two-fluid simulations of magnetic reconnection with a kinetic closure for the electron pressure anisotropy
Magnetic reconnection is a rapid rearrangement of magnetic line topology in a plasma that can allow magnetic energy to heat, drive macroscopic flows, or accelerate particles in space and laboratory plasmas. Though reconnection affects global plasma dynamics, it depends intimately on small-scale …
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Magnetic interaction of super-Earths with their host star and planet composition
We study the magnetic field and the planet-star interactions of super Earths, extrasolar planets with masses between 1 and 10 times the mass of the Earth. We first present a model of the magnetic field of a super Earth, the dynamo model. We then list and explain several mechanisms through which …
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Non-invasive and minimally invasive techniques for urodynamic stress incontinence of urine in women
1. Extra-corporeal magnetic energy stimulation of pelvic floor muscles for urodynamic stress incontinence;Objective: To assess the efficacy and practicalities of extra-corporeal magnetic energy stimulation of pelvic floor muscles as a non-invasive technique for urodynamic stress incontinence of …
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Quasi-one-dimensional magnetism in TiOCl and a theory of a lightly doped dimerized insulator
… this picture, the effect of doping with non-magnetic Sc impurities can be explained in good agreement with the experiment. The magnetic energy scale of J - 660K and the frustration of the interchain geometry render TiOC1 unique among materials with a spin-Peierls transition. This unusual …
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