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.
Results
Showing 1 to 20 of 2527 for “"Electromagnetic"”.
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Electromagnetic Interactions
Made available in DSpace on 2014-12-04T21:02:40Z (GMT). No. of bitstreams: 1 0009133.pdf: 1646284 bytes, checksum: 3b8d52655c38d7c8a056859056b12868 (MD5) Previous issue date: 1954
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Electromagnetic nanopositioner
… voltage amplifier. This thesis demonstrates an electromagnetically driven nanopositioner that is suspended on rubber bearings as a promising, low cost alternative to the piezoelectric nanopositioners. Several key features of the electromagnetic nanopositioner are the flux-steering actuator that …
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Modern electromagnetic scattering
We develop a numerically stable algorithm for electromagnetic wave propagation through planar stratified media. This algorithm is implemented in a modern programming language and is suitable for the study of such applications as Anderson localization and perfect lensing. Our algorithm remains …
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Web-based electromagnetic simulation
Electromagnetic simulators have traditionally been used as back-end analysis tools to verify the results of circuit simulators. They work by accurately modeling the physical effects in a variety of structures ranging from transmission lines to planar circuits.Most of electromagnetic simulation …
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Electromagnetic effects on soybeans
… exposed different varieties of soybean seeds to electromagnetic (EM) radiation at a frequency other than that of light. The objective was to determine changes in the germination rate, if any, under the influence of EM field of a given frequency, power and exposure time. Soybean was chosen because …
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Improving Electromagnetic Bias Estimates
<p>The electromagnetic (EM) bias is the largest source of error in the TOPEX/Poseidon and Jason-1 satellite sea surface height (SSH) estimates. Due to incomplete understanding of the physical processes which cause the bias, current operational models are based on empirical relationships between the …
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Investigation of electromagnetic welding
… several methodologies to study and optimize the electromagnetic process for Electromagnetic Forming (EMF) and Welding (EMW), thereby lowering the necessary process energy up to a factor of three and lengthening the life-time of EMW compression coils. We present a new theoretical approach to …
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Novel electromagnetic scattering phenomena
Scattering of electromagnetic waves is fundamentally related to the inhomogeneity of a system. This thesis focuses on several theoretical and experimental findings of electromagnetic scattering under contemporary context. These results vary from scattering off real structures and off synthetic …
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Microslots : scalable electromagnetic instrumentation
… work is centered around the design of a novel electromagnetic device scalable from centimeters to micrometers called a microslot. By creating a small slot in a planarized waveguide called a microstrip, the boundary conditions of the system force an electromagnetic wave to create a concentrated …
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Thermographic imaging of electromagnetic fields.
It is recognized that a means of converting electromagnetic fields into visible images would greatly simplify the problem of designing structures to optimize their compatibility with such fields. Two needs must be met to allow such visualization. First, the fields must be transduced into a …
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Electromagnetic Tracking for Medical Imaging
This thesis explores the novel use of a wireless electromagnetic: EM) tracking device in a Computed Tomography: CT) environment. The sources of electromagnetic interference inside a Philips Brilliant Big Bore CT scanner are analyzed. A research version of the Calypso wireless tracking system was …
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Computational design for electromagnetic simulations
… and accurately design the shape of complicated electromagnetic objects. These electromagnetic objects can be simulated for operation at high frequencies (~10 GHz), and can be comprised of dissimilar materials. The automated design procedure consists of linking together an original …
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Conservation Laws and Electromagnetic Interactions
Aside from energy, light carries linear and angular momenta that can be transferred to matter. The interaction between light and matter is governed by conservation laws that can manifest themselves as mechanical effects acting on both matter and light waves. This interaction permits remote, …
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Neutron Star Electromagnetic Field Structure
… magnetization is then applied to determine the electromagnetic field structure of the neutron star. As an application of these two calculations, we briefly investigate several radiation mechanisms that are closely related to stellar magnetic fields.</p> <p>Neutron star magnetic field generation …
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Advances in Complex Electromagnetic Media
… and has inspired the creation of many novel electromagnetic structures such as the invisibility cloak.</p><p>In this dissertation the tools used in the field of transformation optics will be explored and expanded. Several new designs are discussed, each of which expands upon the ideas that …
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Low-Frequency Subsurface Electromagnetic Modeling
Subsurface electromagnetic (EM) methods are applied to obtain underground information that is not available from surface observations. This research develops numerical methods for subsurface electromagnetic modeling. The dissertation includes: (1) fast one-dimensional forward and inverse modeling, …
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Electromagnetic suspensions for ground transportation.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1974
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Velocity modulation of electromagnetic waves
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1956
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