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 50 for “"Wave Reflection"”.
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Spherical wave reflection and transmission
This study is concerned with the reflection and transmission of spherical waves at a plane interface between two different media. The phenomenon of the reflection and transmission of spherical waves has been studied by means of analytical methods, numerical computation, and experimental tests. A …
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Wave reflection by a flat plate cascade
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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P-SV converted wave reflection seismic prospecting system. A
Includes bibliographical references (pages 129-130).
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Ultrasonic wave reflection measurements on self-compacting pastes and concretes
… to extend the use of combined longitudinal (P-wave) and shear (S-wave) ultrasonic wave reflection (UWR) to monitor the setting and stiffening of self-compacting pastes and concretes. An additional objective was to interpret the UWR responses of various modified cement pastes. A polymeric buffer …
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A study of water wave reflection using close range photogrammetry
… is to investigate the various forms of water wave reflection to a high degree of accuracy. Close range photogrammetry is the technique that is used to measure the water surface profile, as it produces an accurate and comprehensive analysis of the water surface profiles. Conventional …
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Joint identification in structural waveguides using wave reflection and transmission coefficients
… but often with limited success. In this thesis a wave approach is employed to investigate the reflection and transmission coefficients of various joint models in structural waveguides. The reflection and transmission coefficients are potentially more sensitive to the parameters of the joint …
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Ultrasonic wave reflection measurements on stiffening and setting of cement paste
… of this research is to extend the use of P-wave and S-wave ultrasonic wave reflection (UWR) to monitor stiffening and setting of portland cement paste. The research focuses especially on the very early hydration period, during the first hours after mixing. For such purpose, it is necessary …
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A Nondimensional Scaling Parameter for Predicting Pressure Wave Reflection in Stented Arteries
… be improved, focusing on the problem of pressure wave reflections. A one-dimensional finite-difference model was developed to predict these reflections, and effects of variations in stent and vessel properties were examined, including stent stiffness, length, and compliance transition region, as …
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Algorithm for computation of the acoustic plane-wave reflection coefficient of the ocean bottom
For a spherical acoustic wave incident on a horizontally stratified ocean bottom, the reflected pressure field and the plane-wave reflection coefficient are related through a two-dimensional spatial-wavenumber Fourier transform. An algorithm is proposed to evaluate the plane-wave reflection …
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Simulating acoustic wave reflection, transmission, and scattering in k-Wave for quantitative ultrasound applications
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-12-01
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Application of P-wave Reflection Imaging to Unknown Bridge Foundations and Comparison with Other Non-Destructive Test Methods
… and to compare these methods to an ultrasonic P-wave reflection imaging system. The ultrasonic P-wave reflection system has tremendous potential to provide more information and address several short-comings of other NDT methods. A laboratory study was initiated to explore various aspects related …
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Analysis and interpretation of compressional (P-wave) and shear (SH-wave) reflection seismic and geologic data over the Bane Dome, Giles County, Virginia
Approximately 37 km of predominantly 24-fold P-wave Vibroseis data and 16 km of 24-fold SH-wave Vibroseis data were acquired in the southern portion of the folded Appalachians near the Bane Dome in Giles County, Virginia. Data processing techniques included the application of newly developed …
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The numerical synthesis and inversion of acoustic fields using the Hankel transform with application to the estimation of the plane wave reflection coefficient of the ocean bottom
The plane wave reflection coefficient is an important geometry independent mean of specifying the acoustic response of a horizontally stratified ocean bottom. It is an integral step in the inversion of acoustic field measurements to obtain parameters of the bottom and it is used to characterize an …
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The numerical synthesis and inversion of acoustic fields using the Hankel transform with application to the estimation of the plane wave reflection coefficient of the ocean bottom
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Experimental investigation of wave-induced morphological changes of gravel beaches
… of the behaviour of gravel beaches under wave attack. A two-dimensional physical model was developed for gravel beach applications. Regular and irregular waves were considered as well as two different initial beach slopes. An extensive analysis was performed on the time history of the …
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Impact of Prolonged Sitting on Central Hemodynamics: Role of Intermittent Pneumatic Compression Therapy
… increases central blood pressure, aortic pulse wave reflection and vascular stiffness. <strong>Methods:</strong> In 10 subjects (Age=22±2 yrs, BMI=28±4kg/m<sup>2</sup>, 3 females), brachial artery pulse wave analysis was performed before (baseline-BL), during, and after 3 hours of sitting. …
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Damping of Vibration Using Periodically Voided Viscoelastic Metamaterials
… previously to improve the damping of vibrational waves and acoustic waves through wave scattering and wave reflection at periodic impedance changes. Impedance changes can occur at both material boundaries and geometric changes of the medium. Impedance changes cause wave scattering, wave …
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Autocorrelation Analysis of the Seismic Data Recorded on Mars
… to retrieve two types of seismic phases, body-wave reflection signals and Mars orbiting surface wave signals. The body-wave reflection signal originated from subsurface interfaces of Mars can inform the depth range of these seismic boundaries, including Moho, olivine-wadsleyite transition and …
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