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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 41 for “"electromagnet"”.
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The gridded electromagnet probe
… a grid, a collector, and an inertially cooled electromagnet. The electric mirror force of the grid, which is located at the electromagnet throat, reduces the demand on the magnetic mirror force and thereby on the electromagnet current, which then allows for the construction of a compact probe …
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Analysis of the Modified Square Toroid, A Force-Reduced Electromagnet
Made available in DSpace on 2017-07-06T18:48:28Z (GMT). No. of bitstreams: 3 Hill_James_L_MS.pdf: 59446779 bytes, checksum: 6f9a388bc7f966f031ed23df5e3dc80b (MD5) Hill_James_L_MS_ABS.pdf: 903512 bytes, checksum: d0f38e70bbe02fa291766b009006202e (MD5) license.txt: 4813 bytes, checksum: …
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Full-wave algorithms for model order reduction and electromagnet analysis of impedance and scattering
… ubiquity, the demand for thorough, efficient Electromagnetic (EM) analysis continues to rise. The prohibitive costs of constructing and maintaining measurement facilities and designing and buildin-l system prototypes has fueled even greater demand for Computational Electromagnetics (CEM). …
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Development of a Magnetic Field Sensor System for Nondestructive Evaluation of Reinforcing Steel in Prestressed Concrete Bridge Members
… has been established using a prototype electromagnet-sensor, showing a direct relationship between the cross-sectional area of the strand and the magnitude of magnetic field induced in it. A field test of a box-beam bridge was conducted using both MMF and MFL detection techniques …
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Shading coils for alternating current electromagnets
… in reducing noise in an alternating current electromagnet as those which are smaller and thus have a greater value of resistance. This occurs because in addition to obtaining the greatest shift possible between flux produced by the unshaded and shaded portions of the pole the magnitudes of …
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Some aspects of wind tunnel magnetic suspension systems with special application at large physical scales
… of wind tunnels and advances in superconducting electromagnet technology have greatly reduced the apparent cost of a large, or perhaps more specifically, high Reynolds Number MSBS (LMSBS). Many difficulties remain, however, and three are addressed in this thesis.<br/>A powerful method of magnetic …
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Electromagnetic Printhead Core for Programming Magnetic Pixels
… the design process and implementation of an electromagnetic printhead core used to generate varied flux patterns on said surfaces. The thesis also assess how the generated flux pixels, using an electromagnet, compare to those generated by permanent magnets, before offering some praxis for …
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A low-power-extended-linear-range magnetic levitator
… nonlinear terms which compensate for the electromagnet and sensor nonlinearities, which were measured experimentally. Implementing the nonlinear compensation allows the system to be operating point independent. Frequency compensation was done with a lead network since the resulting …
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Modeling, Analysis and Testing of a Semi-Active Control System for Landing Gear Applications
… for this project used an externally mounted electromagnet located between the damper and remote reservoir, as opposed to an electromagnet located internal to the damper body. This design allows landing gear to use semi-active MR dampers with few modifications to existing designs. A set of …
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An automated monitoring system for the production and measurement of metal fatigue
… them to be driven efficiently by a "U"-core electromagnet. A small, piezoceramic strain gauge provides a method of picking up the vibrations. To maintain resonance, the signal is used in a positive feedback loop, which incorporates an analogue multiplier to provide AGC. This also keeps the …
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Characterization of an Electromagnetic Tuned Vibration Actuator
… to the absorber mass. This research examines an electromagnetic tuned vibration absorber that can have its tuned frequency altered by gap and current variation. The advantage of an adjustable TVA is that the system can be tuned to various excitation frequencies to cancel vibration. This research …
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Growth and Characterization of Manganese Doped Galium Arsenide Thin Films
… Hall Effect characterization system including an electromagnet was set up. GaAs films with various Ga to As ratios were grown at low temperature and high As ratios were used as the basis of growth for Mn doped GaAs thin films. Van der Pauw Hall Effect and resistivity measurements of these films …
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Ferrofluid dynamics in a Hele-Shaw cell simultaneously stressed by DC and rotating magnetic fields
… reported measurements. The large and heavy electromagnet and power supply used in earlier work were also replaced by a small permanent magnet assembly from MagswitchTM to still produce ferrofluid spirals and spontaneous self-assembling ferrofluid dot patterns.
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Floating coil position detection system for the Levitated Dipole Experiment
… The field is created with a superconducting electromagnetic ring in the center of a large vacuum chamber. The goals of the experiment call for the ring to be levitated in the center of the vacuum vessel by the magnetic field of another superconducting electromagnet. This act requires a …
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Shooting device for free-surface impact studies
… a pinball shooter to propel the ball and an electromagnet to suspend the ball before shooting. This shooting mechanism uses magnetic balls of diameter 1 inch and can achieve velocities of 278 m/s when located 1 m above the free surface. The adaptability of the mechanism to other downward …
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A Biaxial Magneto-optical Kerr Magnetometer for Studying Magnetic Thin Films
… is suspended between the pole pieces of an electromagnet resting on the floor. The magnetometer allows for the examination of two independent Kerr effect measurements for application in magneto-optical recording. I have tested the equipment on ferromagnetic films and Fe/ Al2O3 multilayers. …
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Flow NMR, analytical applications and theoretical aspects
… (LC-¹H NMR) is described. Flow inserts for electromagnet and superconducting solenoid magnets are described. Applications to fuel analysis are presented. LC-¹H NMR is shown to be an informative technique. The principle limitation is sensitivity. Conditions for quantitative flow pulse NMR …
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Catheter for endoscopic magnetomotive optical coherence tomography
… (MNPs) are introduced into tissue and an electromagnet is used to generate a small modulated magnetic field within the tissue during OCT imaging. The magnetic field will introduce mechanical displacement of the MNPs, which can be detected, and the MM-OCT signal can be measured. The current …
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DETECTION OF MAGNETIZATION REVERSAL IN A NEODYMIUM-IRON-BORON MAGNET USING A HALL-EFFECT MICROPROBE
… and inserting the probe-magnet assembly into an electromagnet. Barkhausen steps, indicating rapid domain wall motion, were observed (superimposed upon the blank probe signal) in the demagnetization of a fully magnetized magnet. Magnetization traces for a thermally demagnetized Nd-Fe-B magnet did …
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A Study of Non-Fluid Damped Skin Friction Measurements for Transonic Flight Applications
… method utilized eddy current damping from an electromagnet to dampen the motion of the gage. The eddy current damper achieved a much larger reduction in the vibration characteristics of the gage than the previous designs. In addition, the gage was capable of operating at various levels of …
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