Liu Yan, Liu Shi, Lei Jing, Liu Jing, Schlaberg H.Inaki, Yan Yong «A method for simultaneous reconstruction of temperature and concentration distribution in gas mixtures based on acoustic tomography» Акустический журнал, 61, № 5, с. pp597-605 (2015)

The acquisition of the concentration and temperature distributions in a mixed gas system plays a crucial role in real industrial applications. Different from comment measurement method, in this paper an acoustic tomography (AT) based method is developed for the simultaneous reconstruction of the concentration and temperature distributions. The proposed method includes two stages. In the first stage, the correlations of the acoustic velocity and the intensity attenuation with the temperature and concentration are investigated. Then the approach that can simultaneously compute temperature and concentration is proposed. In the second stage, in order to achieve 2D tomography, the stochastic inversion method for solving the inverse problem is developed. Numerical simulations are implemented to validate the feasibility of the proposed reconstruction method.

Jhanwar D., Sharma Kamlesh K., Modani S.G. «Discrimination of environmental background noise in presence of speech using sample-pairs statistics based features» Акустический журнал, 61, № 5, с. pp585-596 (2015)

A methodology to discriminate the different classes of background noise using new features based on samples of the signal is presented here. Two consecutive samples of different amplitude of the discretetime signals are termed as sample-pair and 14 types of sample-pairs are considered here as fundamental features. Results of simulation work proves that count of some of such type of sample-pairs as well as count of few combinations of two, three and four such sample-pairs are useful to detect and discriminate the different acoustic noise mixed with speech signals. On the basis of simulation results, the performance of proposed features have proved better than other spectral features like Mel Frequency Cepstral Coefficients (MFCC), Spectral Centroid, Spectral Flux and Spectral Roll-off regarding discrimination capabilities, simplicity of extraction process and lesser dependency over speech utterances mixed with noise. These sample-pairs based features having advantage of not requiring frame-decomposition and silence period removal. Their discrimination capabilities are shown by Fisher’s F-ratio as performance index. The multiclass Support Vector Machine (SVM) is used as a classifier.

Shchurov V.A. Vector acoustics of the ocean (2006). 297 с.

Results of infrasonic and sonar measurements made by the Ocean Acoustics Noise Laboratory's freely drifting and bottom-mounted unique telemetric combined systems are presented. Field deployments reported were performed in the Pacific and Indian Oceans in 1978 to 1998. The monograph is focused on the ratio of the coherent and diffusive components in underwater ambient noise; interaction between crossing ambient noise and tone or broadband signal energy fluxes; reverberation being observed in the energy flux; connection between the surface roughness direction and strength and the resultant horizontal dynamic noise projection; as well as combined telemetric systems noise immunity. The book is intended for researchers, postgraduates, and students majoring in underwater physical acoustics.

Korobov A.I., Shirgina N.V., Kokshaiskii A.I. «Erratum to: “A pressure effect on the nonlinear reflection of elastic waves from the boundary of two solid media”» Акустический журнал, 62, № 2, с. pp262 (2016)

ACKNOWLEDGMENTS should read as follows: This study was supported by the Russian Science Foundation, project no. 14-22-00042.

Кацнельсон Б.Г., Переселков С.А., Badiey M., Lynch J., Siegmann W. «Пространственно-временная изменчивость звукового поля в океанических волноводах, вызванная внутренними волнами на шельфе. теория и эксперимент (SWARM'95)» Волновые процессы в неоднородных и нелинейных средах. Материалы семинаров научно-образовательного центра, с. 222-242 (2003)

Tokarev Yu.N., Vasilenko V.I., Zhuk V.F., Sokolov B.G., Slipetsky D.Ya. «Acoustical estimation of the antarctic krill swarms spatial distribution and biomass» Морской экологический журнал, № 1, с. 5-14 (2005)

The method of acoustic express-evaluation of the krill (Euphausia superba Dana) population spatial structure and determination of its accumulations biomass, with 80 kHz echosounding frequencies has been worked out during the 7-th Ukrainian Antarctic expedition. The method error does not exceed 10%, which permits to recommend it for usage under the Antarctic krill fishery conditions. The principal possibility to acoustically express-evaluate chorological structure of the Antarctic krill population has been shown. Formation by krill of dense accumulations of different form, elongated for 6 miles, appeared to be an expressed feature of krill behaviour during observations. The school type in krill distribution was observed as well. Parallel to this the accumulations location depth varied in the limits of 10–70 m, and their height made from 5 to 50 m.

Tokarev Yu.N., Vasilenko V.I., Zhuk V.F., Sokolov B.G., Slipetsky D.Ya. «Acoustical estimation of the antarctic krill swarms spatial distribution and biomass» Морской экологический журнал, № 1, с. 5-14 (2005)

The method of acoustic express-evaluation of the krill (Euphausia superba Dana) population spatial structure and determination of its accumulations biomass, with 80 kHz echosounding frequencies has been worked out during the 7-th Ukrainian Antarctic expedition. The method error does not exceed 10%, which permits to recommend it for usage under the Antarctic krill fishery conditions. The principal possibility to acoustically express-evaluate chorological structure of the Antarctic krill population has been shown. Formation by krill of dense accumulations of different form, elongated for 6 miles, appeared to be an expressed feature of krill behaviour during observations. The school type in krill distribution was observed as well. Parallel to this the accumulations location depth varied in the limits of 10–70 m, and their height made from 5 to 50 m.