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 34 for “"electromagnetic theory"”.
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Optimization of image formation in X-ray lithography using rigorous electromagnetic theory and experiments
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Theory and Experiments of Scattering From Microscale Random Rough and Deterministic Surfaces
… Systems (MEMS). Rigorous electromagnetic theory analysis is used to demonstrate the influence of the surface materials, incident wavelength, incident angles and surface geometric parameters on the reflection distribution. A geometric optics approximation to the rigorous …
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Efficient algorithms for the study of waveguiding and scattering structures
… is on the computational aspects rather than electromagnetic theory, although the theory is discussed whenever it is needed.
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Novel Concepts for Differential -Equation-Based Electromagnetic Field Simulations
… and analyze consistency properties of the electromagnetic theory on lattice, for PDE solvers such as the finite-difference, finite-volume or finite-element methods.
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Differential Geometry in Computational Electromagnetics
… In this approach, rather than take the classical theory based on the continuum as a given and constructing approximate numerical techniques from there, work is done toward constructing an alternative to the continuum theory that is built up from scratch in a discrete setting. The goal is to take …
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Design and implementation of control system for magnetic suspension device
… areas of modeling, dynamics, and applied control theory. A single-axis magnetic suspension device originally designed by Professor David Trumper for classroom demonstrations was chosen to improve the understanding of the previously mentioned topics. The dynamics of these types of systems provide …
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Ingestible electronics without batteries : power and communication for gastroresident devices
… under specific absorption of radiation limits. Electromagnetic theory and microwave simulations identified the optimal region of operation for transmitting power through tissue as around 1 GHz. Small loop antennas fabricated to fit onto a circuit board the size of a pill capsule exhibited power …
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The utilization of piezoelectric materials and optical fiber sensors for electric field detection
… preferable due to the immunity of the fibers to electromagnetic interference. A novel electric field sensor is proposed which utilizes the displacement measurement capabilities of the Extrinsic Fabry-Perot Interferometric sensor, and the actuation produced by a piezoelectric material when placed …
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Passive electromagnetic damping device for motion control of building structures
… control of motion in building structures: an electromagnetic damper. The electromagnetic damper is a self-excited device that provides a reaction force to an applied motion. We chose a tubular permanent-magnet linear machine as this new structural damper, and we derive its mathematical model …
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Design and Fabrication of High Frequency Electromagnetic Coil for Magnetic Particle Imaging
… for imaging. This work presents a high frequency electromagnetic coil which fulfills operational, safety, and geometric parameters necessary for incorporation in a custom MPI system and will allow us to simultaneously image and stimulate at specific locations within the body of a mouse. …
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Control and characterization of a cyclotron proton beam
… system was designed by using magnetic circuit theory and fundamental electromagnetic theory. A software package called finite element method magnetic (FEMM) has been used as a simulation tool to conduct finite element analysis of the designed circuit. The beam steering experiment was conducted …
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Electromagnetic analysis with discrete exterior calculus
… to implement discrete exterior calculus (DEC) in electromagnetic analysis. The problem is studied for both partial differential equation (PDE) and integral equation (IE) based approaches. A systematical treatment is proposed for various boundary conditions. With a careful implementation of the …
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A novel wideband 140 GHz gyrotron amplifier
The theory, design and experimental results of a wideband 140 GHz, 1 kW pulsed gyro-traveling wave amplifier are presented. The gyro- TWA operates in the HE(0,6) mode of a novel cylindrical confocal waveguide using a gyrating electron beam. The electromagnetic theory, interaction theory, design …
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Analysis and design of ferrite cores for eddy current-killed oscillator inductive proximity sensors
… this development makes use of fundamental electromagnetic theory. Subsequently, the performance of a score or so ferrite geometries is evaluated by computer simulation using the results of the theory to facilitate effective comparison. The computer simulation is performed using …
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Multilayer composite photonic bandgap fibers
… bandgap fibers. The pertinent background in electromagnetic theory of multilayer dielectric mirrors and optical fibers is surveyed. Materials properties constraints are outlined, with emphasis on those constraints related to processing strategy and ultimate target length scale. Interfacial …
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Second-Surface Mirror Effects in Thin-Film Absorber Layers
… presents three models for the absorption of electromagnetic radiation in thin films. The first assumes a surface heating boundary condition. The second model, derived from electromagnetic theory, is an analytical volumetric heat generation model. This model can be applied to a semi-infinite …
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YEAR ONE HUNDRED REFOUNDATION: A DIDACTIC PROPOSAL FOR A CULTURAL UNDERSTANDING OF QUANTUM MECHANICS
… mechanics for macroscopic bodies and Maxwell’s electromagnetic theory for radiation. This confidence was bolstered by the technological successes that marked a significant phase of the Industrial Revolution. However, beneath this facade, classical physics faced emerging difficulties, struggling …
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Scanning standing-wave illumination microscopy : a path to nanometer resolution in X-ray microscopy
… approaching that of electron microscopy. In theory, x-ray microscopes can image unsectioned hydrated cells with nanometer resolution. In practice, however, the resolution of x-ray microscopes is limited to approximately 20 nm due to difficulties in the construction of high numerical-aperture …
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