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 13 of 13 for “"Wave Behavior"”.
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Arbitrarily Oriented Biaxially Anisotropic Media: Wave Behavior and Microstrip Antennas
<p>This dissertation explores the electromagnetic behavior of arbitrarily oriented biaxially anisotropic media. An overview of wave behavior in biaxially anisotropic (or simply biaxial) media is presented. The reflection and transmission behaviors of electromagnetic waves from half-space and …
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Chemical and Thermochemical Wave Behavior in Multiphase Fluid Flow Through Permeable Media: Wave-Wave Interactions
… reactive flow. These regions are separated by waves, which mark the change in composition from one region to the next. We develop a theory which elucidates the interactions of these chemical waves with those formed from other flowing phenomena. We consider the following interactions: 1.) the …
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Experimental Investigation of Hyperbolic Heat Transfer in Heterogeneous Materials
In previous studies, evidence of thermal wave behavior was found in heterogeneous materials. Thus, the overall goal of this study was to experimentally verify those results, and develop a parameter estimation scheme to estimate the thermal properties of various heterogeneous materials. Two types of …
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Imaging surface acoustic waves in anisotropic and periodic media
… has been developed for studying surface acoustic wave propagation. The technique, which uses non-contact immersion transducers to excite and detect ultrasound with frequencies between 1 and 20 MHz, allows convenient examination of surface waves traveling in arbitrary directions on a sample. …
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Sound-induced micromechanical motions in an isolated cochlea preparation
… by measuring both radial motions and traveling-wave behavior of structures within this organ in response to sound stimuli. To enable such measurements, we have developed a new preparation for observing three-dimensional motions of micromechanical structures in the apical region of an isolated …
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Detection and assessment of wood decay – glulam beams and wooden utility poles
… of the structure of trees, the mechanical behavior of wood subjected to rot, and current utility pole inspection methods. Background regarding inspection methodology on wood structures is provided. Cross-sectional images of the glulam beams and the utility poles used in this study were …
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Developments in time-resolved ultrafast imaging and spectroscopy at terahertz frequencies
… in THz detection methodology, both in a waveguide platform and in a more typical free space geometry. In the waveguide approach, THz generation, detection, and manipulation is self-contained in an on-chip system that we term the polaritonics platform, which simply consists of a single …
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A Wave Propagation Approach for Prediction of Tire-Pavement Interaction Noise
… work proposes a new approach that incorporates wave behavior along the tire's circumferential direction, while modes are assumed along its transversal direction. The formulation for new infinite plate and cylindrical shell structural models of a tire is presented. These are capable of accounting …
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Asymptotic Wave Solutions for Euler-Bernoulli and Timoshenko Beam by Ray Method and Stationary Phase Method
The behavior of flexural (bending, transverse) waves in beam structures is of basic importance in the stress wave theory and has been studied for many years. Many methods have been attempted to understand the flexural waves in beams based on Euler-Bernoulli and Timoshenko beam theories. Accurate …
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Instabilities in newtonian films and nematic liquid crystal droplets
… droplets within the framework of the long wave (lubrication) approximation are studied. For Newtonian films, it is found that, under destabilizing gravitational force, a contact line, modeled by a commonly used precursor film model, leads to free surface instabilities without any additional …
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Characterization of Liquid Metal Free Surface Response to an Electromagnetic Impulse and Implications for Future Nuclear Fusion Devices
… if the PFCs are LM, the forces excite wave behavior that has not previously been investigated. The work presented here first characterizes the response of LMs to current pulses which peak between 50 and 200 kA and generate magnetic pressures between 0.5 and 5 MPa. High-speed videography …
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Interfacial properties of fluid phases in two dimensions and of three-component surfactant systems
… fluids. The first problem concerns the critical behavior of the thickness of interface of simple fluids in two dimensions of space. We study this problem using both theory and computer simulations. In our theoretical study of this problem, the equilibrium interface is assumed, in accord with …
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Analysis and Experimental Investigation of Wave Propagation and Energy Transfer in Mechanical Rotator Metamaterials
… and manipulating the propagation of waves and energy transfer in engineered materials characterized by periodic arrangements of unit cells. This organized arrangement governs wave behavior, imparting dispersive characteristics and frequency band structures, thereby inspiring the …