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Vortex features of acoustic intensity vector in the shallow water

Shchurov V., Kuleshov V., Cherkasov A.

Hydroacoustics

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2011

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Vol. 14

209-216

EN

The vortex structure of acoustic intensity vector in the shallow water depending on a distance and frequency emitting was researched basing on the natural in-situ experiment. The experiment was fulfilled using the combined acoustic receivers in the Peter the Great Bay in the Japanese Sea. When axes x and y of rectangular system of coordinates being located in horizontal plane of the combined receiver, axis z was directed from surface to bottom. The receiver was submerged to ~70 m depth at the site depth of ~120 m; sound velocity on the surface was higher than that of the bottom’s one. To determine the vorticity there were calculated three components of rotor of intensity vector then, their histograms of distribution of probability density were plotted. In the work there were presented distribution histograms of the vorticity probability density of intensity vector for 110 Hz frequency under the different distances between source and receiver within ~1000–5000 m. In the case of single source the highest density of probability corresponds to magnitude of š1 for x- and y- norm components of rotor and 0 – magnitude for its z-component. As follows from the experiment the steady vorticity of acoustic intensity vector was observed along the entire distance (~4000 m) from source to receiver. The described mechanism of acoustic intensity transfer opens new possibilities in the research of acoustic features in the shallow water. The fixed vortex structures pose an interest as for physical acoustics, as for applied challenges of undersea acoustics.

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Spectral Division of the Optical Fiber Passband Using Narrowband Controllable Filter on the Base of Semiconductor Waveguide Microresonator

Goncharenko I., Esman A., Zykov G., Kuleshov V., Marciniak M., Pilipovich V.

Journal of Telecommunications and Information Technology

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2008

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nr 4

67-72

EN

We analyze the new principle of multichannel spectral division of optical fiber passband using controllable narrowband integrated optical filters composed of two-coupled ring microresonators made of different semiconductor materials. It is shown that appropriate selecting the semiconductor material and optimizing the design factors of selective optical element allows creating the simple and economical integrated optical filter with bandwidth 0.1 nm, frequency separation between adjacent optical carriers 0.2 nm and signal-to-noise ratio 50 dB. Utilizing such filters in optical fiber communication lines makes it possible to increase the number of transmitted in parallel optical carrier wavelengths up to 160 and even more, i.e., to provide the traffic transmission with the speed up to 1.6 Tbit/s in one direction and in single optical fiber.

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On cross-processing scalar and vector quantities in underwater acoustics

Shchurov V., Kuyanova M., Tkachenko H., Kuleshov V.

Hydroacoustics

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2006

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Vol. 9

159-170