Contents

Acoustical Physics

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Vol. 67, No. 2, 2021

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Classical Problems of Linear Acoustics and Wave Theory

A Study of Wave Processes in Elastic Topographic Waveguides

A. O. Vatulyan and L. I. Parinova p. 101  abstract

Two Approaches to Solving the Problem of Diffraction on a Janus Sphere

D. V. Krysanov, A. G. Kyurkchan and S. A. Manenkov p. 108  abstract

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Nonlinear Acoustics

Levitating Force and Stability Analysis of Near-field Acoustic Levitation using Flexural Vibrations of the Plate

Saurabh Yadav and Arpan Gupta p. 120  abstract

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Physical Acoustics

An Acousto-Optic Polarization-Insensitive Two-Coordinate Deflector

S. N. Antonov and Yu. G. Rezvov p. 128  abstract

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Ocean Acousticics. Hydroacoustics

Experimental Evaluation of the Influence of the Seawater Characteristics on Spatial and Temporal Variations of the Sound Speed in the Southern Abyssal, Intermediate and Shelf Zones of the Caspian Sea

Siamak Jamshidi and Marzieh Yousefi p. 134  abstract

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Acoustics of Structurally Inhomogeneous Solid Media. Geological Acoustics

Experiments with Vibration Displacement of Volume-Localized Clusters of a Loose Granular Medium: New Effects

Yu. N. Makov p. 147  abstract

Acoustic Features of the Elastic Anisotropic Properties of Rock Samples Along the Section of the Kola Superdeep Borehole (SD-3)

O. M. Trishina, F. F. Gorbatsevich and M. V. Kovalevsky p. 156  abstract

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Acoustic Ecology. Noises and Vibrations

Two Dimensional Locally Resonance Phononic Crystals for the Reduction of Vibration and Noise in Wheel-driven Bus

Boqiang Zhang, Penghui Chen, Chengxin Cai and Xinping Wu p. 175  abstract

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Acoustic Signals Processing. Computer Simulation

Direction Finding of a Source in an Acoustic Waveguide and the Angular Resolution Limit

A. G. Sazontov and I. P. Smirnov p. 183  abstract

Phase Analysis of the Activity of a Voice Source

V. N. Sorokin and A. S. Leonov p. 193  abstract

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Acoustics of Animate Systems. Biomedical Acoustics

Control of the Biceps Activity with the Simple Ultrasound Probe

T. Krit, Sh. Asfandiyarov and Y. Kamalov p. 210  abstract

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Physical Foundations of Technical Acoustics

The Features of Measuring the Gas Flow Velocity in Pipes by an Ultrasonic Correlation Method

A. D. Mansfeld, G. P. Volkov, R. V. Belyaev, A. G. Sanin, P. R. Gromov and N. E. Klimkina p. 216  abstract

Experiments on Actively Suppressing Sound Reflection and Radiation by a Piston in a Water-Filled Pipeline

S. G. Mikhailov p. 222  abstract

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