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Your search keyword '"Naugolnykh, K. A."' showing total 25 results
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25 results on '"Naugolnykh, K. A."'

6. NEW SCHEMES OF OCEAN ACOUSTIC TOMOGRAPHY

Author

Shang, E. C., Voronovich, A. G., Wang, Y. Y., Naugolnykh, K., and Lev Ostrovsky

Subjects
Acoustics and Ultrasonics, Applied Mathematics
Abstract

Ocean acoustic tomography based on modal horizontal refraction/phase difference measurement has been developed in recent years. In this paper, potential opportunities for remotely sensing various interesting ocean dynamic structures by using the modal-horizontal-refraction tomography and modal-phase tomography are discussed, including: (1) retrieval of the 3-D structure of a mesoscale eddy, (2) monitoring of the transverse component of the current, (3) retrieval of ocean frontal parameters, and (4) acoustically diagnosing internal solitary waves (ISW) in the coastal zone.

Published
2000

14. Infrasound Radiation of Cyclone.

Author

Naugolnykh, K. and Rybak, S.

Subjects
*TROPICAL cyclones, *ASTRONOMICAL perturbation, *ACOUSTIC radiation pressure, *SOUND waves, *INFRASONIC waves, *ATMOSPHERIC waves, *WAVEGUIDES, *PARTIAL differential equations
Abstract

Tropical cyclones produce strong perturbations of atmosphere and the ocean surface accompanying by an acoustical radiation. Infrasonic signals in the 0.1–0.5 frequency band can be observed at a distances of thousands of miles from the cyclone. There are specific features of the mechanism of infrasound radiation by cyclone. The radiated sound can be trapped by atmospheric wave guide. The presence of oversaturated water vapor layer in the upper domain of the cyclone leads to the development of specific nonlinear effects of radiation instability that provides amplification of infrasound radiation. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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17. Nonlinear propagation of laser-generated sound pulses in a granular medium.

Author

Naugolnykh, K. A., Esipov, I. B., and Matveev, K. A.

Subjects
*NONLINEAR acoustics, *ACOUSTIC surface waves, *GRANULAR materials
Abstract

Nonlinear propagation of finite amplitude acoustic pulses in a water-saturated granular medium is considered, A laser sound source was used to generate acoustical pulses of amplitude up to 3 MPa and duration of about 1 µs in water. Specific acoustical features of the crust such as nonlinear sound pulse distortion and the frequency dependance of attenuation, varying with the amplitude, are considered. A theoretical interpretation of the results is given. [ABSTRACT FROM AUTHOR]

Published
2000

20. Sound Signal Scintillation Approach in the Acoustic Modeling of the Current Speed Profile in the Fram Strait.

Author

Esipov, I. B., Johannessen, O. M., Naugolnykh, K. A., Ovchinnikov, O. B., and Tuzhilkin, Yu. I.

Subjects
SOUND
Abstract

The results of mathematical model measurements of the speed of the transverse current in the Fram Strait are presented. The method is based on the statistical processing of the propagation time fluctuations of the probing signals along 16 acoustic tracks. The dependence of the sound velocity on depth is assumed to correspond to winter conditions. For the imitation of the current, the three-dimensional field of environmental inhomogeneities observed in the strait is computed. The complex profile of the current in the direction across the strait is represented by the motion of 10 layers of this field that move with different velocities. The measuring system consists of four transmitters and four receivers positioned near both coasts of the strait. The rays used for the measurements do not touch the bottom and do not change their type under the effect of environmental inhomogeneities crossing the acoustic tracks. [ABSTRACT FROM AUTHOR]

Published
2002
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23. NEW SCHEMES OF OCEAN ACOUSTIC TOMOGRAPHY.

Author

SHANG, E. C., VORONOVICH, A. G., WANG, Y. Y., NAUGOLNYKH, K., and OSTROVSKY, L.

Subjects
OCEAN tomography, OCEAN dynamics, MESOSCALE eddies
Published
2004

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