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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
Е. В. Голубева, V. A. Eliseevnin
Underwater surf noise near sea coasts of different types
Pleiades Publishing Ltd - - 2008
V. I. Bardyshev
Phase method of crosswell profiling using coherent SH waves
Pleiades Publishing Ltd - Tập 58 - Trang 596-602 - 2012
V. S. Averbakh, A. V. Lebedev, S. A. Manakov, V. I. Talanov
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...... hiện toàn bộ
Travel Time Curves of Seismic Waves from Underground Explosions on Amchitka Island
Pleiades Publishing Ltd - Tập 67 - Trang 640-647 - 2022
K. S. Nepeina, V. A. An
The paper presents the parameters of seismic wave travel times for three artificially induced events obtained from the archive of the Institute of Geosphere Dynamics (IDG RAS). For the study, we chose underground nuclear tests (Long Shot, Milrow, and Cannikin) with magnitudes 6.1 < mb < 6.8 conducted by the United States of America from 1965 to 1971 on Amchitka Island in the Aleutian Arc. The stud...... hiện toàn bộ
Continuous model of 2D discrete media based on composite equations
Pleiades Publishing Ltd - Tập 56 - Trang 807-810 - 2010
I. V. Andrianov, V. V. Danishevs’kyy, D. Weichert
The paper focuses on the development of 2D continuous models for a theoretical prediction of dynamic properties of discrete microstructures. A new continualization procedure, which refers to nonlocal interactions between variables of the discrete media, is proposed and the corresponding continuous model is obtained. The performed study is based on the application of composite equations. The develo...... hiện toàn bộ
Focusing of a wave beam in an underwater sound channel
Pleiades Publishing Ltd - Tập 57 - Trang 824-832 - 2011
A. L. Virovlyansky, A. Yu. Kazarova, L. Ya. Lyubavin
The use of a vertical radiating antenna array for generation of a wave beam propagating in an underwater sound channel along the reference ray trajectory is discussed. The method for selecting the starting field in the antenna aperture for maximum compression of a beam in the specified vicinity of the reference ray is proposed. The estimates showing up to what distances a beam can propagate while ...... hiện toàn bộ
Selection of modes by time reversal in a shallow sea
Pleiades Publishing Ltd - Tập 55 - Trang 754-761 - 2009
V. A. Zverev, P. I. Korotin, A. A. Stromkov
Modes of the waveguide are selected from signals of individual receivers by time reversing them with the use of the frequency response of a plane wave. The experimental distribution of the modes on the “arrival time — mode number” plane corresponds to the model of an ideal waveguide, differing in that higher modes advance lower ones in the experiment. A modification of the frequency response, whic...... hiện toàn bộ
An Acousto-Optic Splitter–Rotator of the Plane of Polarization of Two-Color Radiation
Pleiades Publishing Ltd - Tập 68 - Trang 11-17 - 2022
V. M. Kotov
A method for splitting two-color optical radiation into monochromatic components, whose planes of polarization rotate with the frequency of a sound wave, is proposed. The method is based on the double passage of two-color radiation through an acousto-optical (AO) modulator made of a gyrotropic crystal, as well as on the property of light to change the polarization to the mutually orthogonal one as...... hiện toàn bộ
On the attached length of orifices
Pleiades Publishing Ltd - Tập 58 - Trang 628-632 - 2012
A. I. Komkin, M. A. Mironov, S. I. Yudin
The attached length of orifices in reactive mufflers has been estimated based on numerical calculations by the finite-element method. The numerical results for a diaphragm in a duct are compared with the theoretical data obtained by Rayleigh, Fock, Karal, and Ingard. The dependence of the attached length on the diaphragm thickness is given. The results obtained are generalized for the case in whic...... hiện toàn bộ
Modeling the spectrum of infrasonic hydroacoustic radiation generated by the sea surface under storm conditions
Pleiades Publishing Ltd - Tập 62 - Trang 554-558 - 2016
A. S. Zapevalov, K. V. Pokazeev
Generation of infrasonic radiation into a water medium by sea surface waves is analyzed. The analysis is carried out for the situation in which the infrasound is generated by surface waves with frequencies close to those of dominant waves. The presence of two wave systems on the sea surface is assumed: swell and wind waves. It is shown that if the frequencies of spectral peaks of wind waves and sw...... hiện toàn bộ
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