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Showing 1 to 20 of 56 for “"Reflection Coefficients"”.
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Reflection coefficients and azimuthal AVO analysis in anisotropic media
Includes bibliographical references (pages 140-147).
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Thin-bed resolution from cepstrum analysis
… is shown to be sensitive to the ratio of the reflection coefficients at the top and bottom of the thin-bed. Specifically, the resolution depends on the ratio of the reflection coefficients. Optimum resolution is achieved when the reflection coefficients at the top and bottom of the thin-bed …
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Adaptive Control Strategies for Mitigating Spaceflight Fluid Shifts Using Lower Body Negative Pressure and Non-Invasive Fluid Shift Sensing
… study involving controlled LBNP exposure. Reflection coefficients (S₁₁ and S₂₂) were analyzed to detect regional fluid changes in arm and leg tissue. The preliminary results indicated a statistically significant decrease in the arm reflection coefficients (S₁₁) during active LBNP, which is …
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The effect of segment averaging on the quality of the Burg spectral estimator
… segment averaged. Averaging of autoregressive coefficients, reflection coefficients, or spectral density functions is used with the BSE and the corresponding performances are studied. Approximate expressions for the mean and variance of these modified Burg spectral estimators are derived. Lower …
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Azimuthal P-wave AVA Inversion for Fracture Orientation and Density
… medium to analyze variations of seismic reflection amplitudes with incident and azimuthal angles (AVAZ). The intent is to extract the information about the fracture orientation and intensity of a fractured medium. The effective compliance tensor for a fractured medium can be written as …
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A seismic reflection study over the Bane anticline in Giles County, Virginia
A seismic reflection study over the Bane anticline in southwest Virginia (37° 16' 50" N, 80° 41' 30" W) was made in an attempt to gain information about the thickness of sedimentary rocks in this part of the Appalachian Valley and Ridge province. Eleven seismograms were obtained. In addition to …
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Extracting Polar Anisotropy Parameters from Seismic Data
… factors in the real data, but not the reflection coefficients. After scaling, the difference between the real data, thus normalized, and the isotropic synthetic data are attributed to the anisotropic part of the reflection coefficients. The resulting distributions of and are compared to …
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Prediction of sound pressure and intensity fields in rooms and near surfaces by ray tracing
… travelled and phase changes imparted by surface reflections as described by complex reflection coefficients. Further modifications included predicting steady-state and transient sound-intensity levels, providing information on the direction of sound-energy flow. The modifications were validated …
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Radio Echo Sounding Studies of Svalbard Glaciers
… using, as the primary data source, radar reflection coefficients. From these data inferences about the presence of water and/or debris, roughness of the interface and geographical trends were made. A number of geological divides were detected. Second, the dielectric properties of Svalbard …
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Calculation of a Synthetic Gather using the Aki-Richards Approximation to the Zoeppritz Equations
… rock properties useful in oil exploration. Reflection coefficients derived from measured well log data are convolved with a Ricker wavelet to create a synthetic seismic trace. The Zoeppritz equations describe the propagation of an acoustic wave across an interface between two viscous media …
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Inelastic nuclear scattering of strongly absorbed particles
… the Coulomb force and the shape of the reflection coefficients in angular momentum space. Analyses of representative sets of experimental data are presented. The results indicate that the Austern-Blair theory. ts remarkably successful in representing the shape of the angular …
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Scattering Matrix Analysis of Surface Acoustic Wave Reflectors and Transducers
… transfer function, and acoustic transmission and reflection coefficients as functions of frequency. Analysis results for the complete modeling of transducers with floating electrodes are also presented.
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Correlation of seismic reflection data with seismicity over the Ramapo, New Jersey, fault zone
Reflection seismic data, mylonite reflectivity, gravity data, and earthquake hypocenters have been integrated into a possible explanation for seismicity in the Ramapo fault area. Seven reflection seismic lines were processed using variations in sorting and residual statics. Single VIBROSEIS sweeps …
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Continuously tapered dielectric matching transitions for waveguides
… other continuous tapers which promise lower reflection coefficients than the linear tapers are analyzed using the first-order approximation"--Abstract, page iii.</p>
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Wave reflections from breakwaters
A new method is presented for estimating the reflection of a random, multi-directional sea from a coastal structure. The technique is applicable to an array of wave gauges of arbitrary geometry deployed seaward of the reflector. An expansion for small oblique wave incidence angles is used to derive …
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Acoustic sounding of snow water equivalent
… was used to determine acoustic pressure wave reflection coefficients at the interfaces between 'layers' indicative of changes in acoustic impedance. Using an iterative approach involving boundary conditions at the interfaces, the depth-integrated SWE was determined using the Berryman equation …
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Tensorial Impedance Surfaces for Manipulating Microwaves
… illumination are initially discussed, with the reflection coefficients for a generic tensorial impedance boundary derived. This work includes the derivation of an equation that calculates the range of impedance spatial distributions that satisfy a desired reflection problem. The degree of …
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INTERPRETATION OF NARROW BEAM SONAR ECHOS USING A VARIABLE IMPEDANCE SUBBOTTOM MODEL
… The magnitude and phase angle of the boundary reflection coefficients were calculated allowing determination of positive or negative changes in the characteristic acoustic impedance of the respective layers. Relative impedance profiles, plotted over a region where facsimile graphs indicated a …
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Exact Solutions of Planar Photonic Crystal Waveguides with Infinite Claddings
… this investigation, a rigorous analysis of the reflection of uniform plane waves from a semi- infinite periodic dielectric structure is undertaken. Both parallel and perpendicular polarizations for the incident plane wave are considered. Exact expressions for the reflection coefficients …
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