Vol. 66, No. 2, 2020

Acoustical Physics

Classical Problems of Linear Acoustics and Wave Theory

On Estimating the Laws of Radial Inhomogeneity in a Cylindrical Waveguide

A. O. Vatul’yan and V. O. Yurov p. 97 abstract

Experimental Confirmation of an Analytical Model of the Sound Propagation in a Rectangular Duct in the Presence of Impedance Transitions and Development of an Impedance Eduction Method Based on it

N. N. Ostrikov, M. A. Yakovets and M. S. Ipatov p. 105 abstract

Physical Acoustics

Tunable Elastic wave Bandgaps and Waveguides by Acoustic Metamaterials with Magnetorheological Elastomer

Shaogang Liu, Yuechao Zhao, Dan Zhao, Junchao Wu and Chunxiao Gao p. 123 abstract

Application of the Optoacoustic Method to Assess the Effect of Voids on the Crack Resistance of Structural Carbon Plastics

R. I. Vorobyev, I. V. Sergeichev, A. A. Karabutov, E. A. Mironova, E. V. Savateeva and I. Sh. Akhatov p. 132 abstract

Levitation and Control for an Ordered Group of Particles and Rectilinear Structures in an Ultrasonic Field

D. Ya. Sukhanov, S. N. Roslyakov and F. S. Emel’yanov p. 137 abstract

Ocean Acoustics. Hydroacoustics

Conditions for Separation Rays by Their Arrival Time at Large Distances and Low Frequencies

V. A. Zverev, V. N. Golubev and P. I. Korotin p. 145 abstract

Direction Finding with a Vector–Scalar Receiver in the Field of Anisotropic Interference

S. G. Mikhailov p. 152 abstract

Caustic and Weakly Diverging Beams in Horizontally Inhomogeneous Oceanic Waveguides

Yu. V. Petukhov, V. G. Burdukovskaya and E. L. Borodina p. 162 abstract

Dimension Reduction in Location Estimation—the Need for Variable Propagation Speed

J. L. Spiesberger p. 178 abstract

Acoustics of Structurally Inhomogeneous Solid Media. Geological Acoustics

Influence of the Contribution of Body Waves to the Result of the Microseismic Sounding Method

A. A. Tsukanov and A. V. Gorbatikov p. 191 abstract

Acoustic Signals Processing. Computer Simulation

Ultrasound Imaging through Layers with Unknown Parameters

S. A. Titov and P. V. Zinin p. 198 abstract

A Low-complexity Minimum Variance Algorithm Combined with Power Method for Ultrasound Imaging