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 51 for “"Electric and magnetic fields"”.
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Investigation of germanium in high electric and magnetic fields
… Institute of Technology, Department of Electrical Engineering, 1960
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Transport properties of electrons in potassium bromide
… KBr crystals were measured as o function of electric and magnetic fields in the temperature range of 4.2 K to 78 K. The wavelength dependence o£ the photocurrent was determined in the same range of temperature. The symmetry of the conduction band at 4.2 o K was determined from observation of …
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Tools for electromagnetic field simulation in the KATRIN experiment
… task, the experiment employs precisely defined electric and magnetic fields for particle transport and mass spectroscopy. In order to simulate particle trajectories in the experiment, it is essential to have methods for calculating these fields quickly and accurately. The application of the …
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A dual mode pulsed electro-magnetic cell stimulator
This thesis presents the design and test of a dual-modality cell stimulator. The stimulator generates pulsing electric and magnetic fields at programmable rates and intensities. The target application is the stimulation of bone and muscle cells. While electric and magnetic stimulators have been …
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A mechanical analogy and graphical method for explaining negative transconductance in crossed electrostatic and magnetic fields
The Numerous electronic devices utilize crossed electric and magnetic fields, but only the very simplest of cases may be analyzed by analytical methods. The purpose of this study is to demonstrate the use of a mechanical analogy and graphical methods in the solution of the more complex problems of …
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Wave propagation in lossy waveguide structures
… the propagation constant in waveguides and transmission lines. The technique accounts for both dielectric and conductor losses in a guide having an arbitrary cross section and uses a full-wave solution process. A set of coupled, vector integral equations which characterize the system are …
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A Fourier Solution for Electromagnetic Scattering by a Covered Rectangular Cavity
… metallic surface that has been covered with a dielectric material. The transverse magnetic and transverse electric polarizations are both considered. The rectangular geometry of the embedded cavity allows for the use of a Fourier based solution. Presented here are modifications to the Fourier …
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A Finite Element Approach to Model Electromagnetic Fields Scattered by a Buried Cavity
… has been covered with a layer or layers of dielectric material, considering both transverse electric and transverse magnetic polarizations. Due to the shape of the cavity, this problem is approached using the finite element method. This approach provides a boundary condition at the opening of …
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Chiral symmetry breaking and external fields in the Kuperstein-Sonnenschein model
… breaking has been proposed by Kuperstein and Sonnenschein by embedding non-supersymmetric probe D7 and anti-D7 branes in the Klebanov-Witten background. We study the dynamics of the probe flavours in this model in the presence of finite temperature and a constant electromagnetic field. In …
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Comprehensive Electromagnetic Approach for Modeling of on-Chip Power Grid Switching
… is the development of a discrete electro-magnetic model for the on-chip power grid directly from the physical geometry in chip design. More specifically, the primitive system of Maxwell's equations for the rotation of the electric and magnetic fields is discretized over a finite-difference …
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Electrochemical modulation of fluorescence of nitrogen vacancy centers in nanodiamonds for voltage sensing applications
… environmental variables such as temperature and electric and magnetic fields. Most sensing protocols depend on the optically detectable magnetic resonance of the negatively charged NV- spin state. As such, fluctuations in the NV charge state present a challenge for NV- spin-based sensing. …
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The utilization of piezoelectric materials and optical fiber sensors for electric field detection
… for the measurement of strain, temperature and pressure has been widely investigated. Much less research has been directed towards the use of these sensors for measuring electric and magnetic fields. As existing field meters have conductive parts which inherently cause field distortion, a …
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Development of an electromagnetic numerical solver based on the finite difference time domain (FDTD) technique for research and teaching purposes
… support plane wave excitation in 3D-FDTD domain and the code was developed using C++ programming language. First-order Mur absorbing boundary condition (ABC) is applied to keep outgoing electric and magnetic fields from being reflected into the problem space. In this thesis, the performance of …
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Methodologies for Broadband Electromagnetic Modeling of on-Chip Semiconductor Substrate Noise
… method (FEM) formalism, has been reformulated and adapted to work within the FIT framework. One important element of the presented subgridding scheme is that it maintains the transpose property between the discrete curl operators for electric and magnetic fields. This is a key ingredient for …
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Polaron transport in silver bromide
… in order to observe the transient Hall effect and photoconductivity. High sensitivity is achieved by applying large electric and magnetic fields and through improvements in signal to noise ratio by means of pulsed averaging. In order to observe the Hall effect in thin film samples a novel …
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Design and Testing of the Measuring System for the Characterization of Magnetoelectric Composites
<p>The goal of this thesis is to design, build and test a new measurement system for comprehensive studies of the magnetoelectric and the converse magnetoelectric effect. The research on multiferroic composites is an emerging field of research and there is no commercially available equipment. The …
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Optical properties of GaAs coupled quantum wells and superlattices: electric and magnetic field effects
In this thesis the effects of electric and magnetic fields on the optical transmission and reflection spectra of GaAs/ AlGaAs coupled quantum wells and superlattices are investigated and their potential application in optical modulation demonstrated. Quenching and enhancement of excitonic …
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NV diamond project for nEDM
… as metrological sensors for measuring both, electric and magnetic fields at room temperature and also at 4 K. This thesis discusses different techniques used to probe the NV centers electronic structure. The first, Optically Detected Magnetic Resonance (ODMR) allows us to probe the Zeeman and …
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Subdimensional particles and higher rank quantum phases of matter
… phases of matter, such as quantum spin liquids and fractional quantum hall systems, are well-described in the language of gauge theory. Until recently, most theoretical attention has been focused on systems described by familiar vector gauge theories. In this thesis, we will explore the …
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Green's function analysis of bunched charged particle beams
In this thesis, we analyze the dynamics and equilibrium of bunched charged particle beams in the presence of perfectly conducting walls using a Green's function technique. Exact self-consistent electric and magnetic fields are obtained for charged particles in the vicinity of a conducting boundary …
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