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The effect of a surface impedance load on the behavior of quasi-Rayleigh waves near a cylindrical cavity
Pleiades Publishing Ltd - Tập 56 - Trang 422-428 - 2010
The effect of a surface impedance load on the properties of axisymmetric quasi-Rayleigh waves propagating along the boundaries of a cylindrical cavity is investigated. By solving the problem by means of the impedance method, a dispersion equation for these waves is obtained. It is shown that the equation can be represented as the condition that the determinant of the sum of impedance matrices of t......
Reconstruction of the fine structure of an acoustic scatterer against the distorting influence of its large-scale inhomogeneities
Pleiades Publishing Ltd - Tập 49 - Trang 627-637 - 2003
In the ultrasonic diagnostics of small-size neoplasms of biological tissues at the earliest stage of their development, an efficient way to eliminate the distorting influence of high-contrast or large inhomogeneities of the biological medium is to apply the iterative technique. A simple approach is proposed, which makes it possible with only two iteration steps to achieve an efficient focusing of ......
Study of how hydrological conditions affect the propagation of pseudorandom signals from the shelf in deep water
Pleiades Publishing Ltd - Tập 62 - Trang 350-356 - 2016
The paper examines how hydrological conditions affect manifestation of the acoustic “landslide” effect, which consists in focusing of acoustic energy in the near-bottom layer on the shelf and its transition to the axis of an underwater sound channel in deep water. We compare the results of experiments performed in the Sea of Japan in April 2014 and August 2006 on the same acoustic track, where the......
Acoustic attenuation in the layers of a microwave transducer at the excitation of longitudinal and shear elastic waves by a piezoelectric of the 6mm symmetry class
Pleiades Publishing Ltd - Tập 49 Số 6 - Trang 668-676 - 2003
Generation of a single normal wave by a vertical linear array in the water layer
Pleiades Publishing Ltd - Tập 54 Số 1 - Trang 52-57 - 2008
Spatial Vector–Scalar Structure of Low-Frequency Fields of Multipole Sources in Interference Maxima Zones
Pleiades Publishing Ltd - - 2020
Study of thermoviscous dissipation on axisymmetric wave propagating in a shear pipeline flow confined by rigid wall. Part I. theoretical formulation
Pleiades Publishing Ltd - Tập 62 - Trang 27-37 - 2016
Axisymmetric acoustic wave propagation in a shear pipeline flow confined by a rigid wall is studied in the two-part paper. The effects of viscous friction and thermal conduction on the acoustic wave propagating in the liquid and perfect gas are respectively analyzed under different configurations of acoustic frequency and shear flow profile. In Part 1 of this paper, mathematical models of non-isen......
Correlation reception of thermal acoustic radiation
Pleiades Publishing Ltd - Tập 49 - Trang 615-619 - 2003
Correlated signals of thermal acoustic radiation from heated sources extending in the transverse direction (a pair of narrow plasticine plates and a wide plasticine strip) are measured. The measurements are performed by multiplying together the signals that are shifted in time with respect to each other and detected by two piezoelectric transducers. The values of the correlated signals of thermal ......
Phase method of crosswell profiling using coherent SH waves
Pleiades Publishing Ltd - Tập 58 - Trang 596-602 - 2012
The results of an experiment on crosswell profiling using the coherent downhole source of SH waves are presented. Seismic records were obtained during stationary disposal of the source and varying depths of the vector receiver position. The source coherence made it possible to accumulate signals, thus sub-stantially improving the quality of seismograms and measuring phases. These procedures allowe......
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