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Students

1. Deputovich Natalia Sergeevna
   Work: Device design for the sound-absorption coefficient measurement at low frequency range and it experimental verification. Moscow Technical University of Telecommunication and Information.
   Date of birth: November 23, 1973.
   Place of birth: Moscow, Russia.
   Education: Graduated from Moscow Technical University of Telecommunication and Information (MTUTI) 1997.
   Scientific supervisor: Dr. Yury I. Belousov.
   She developed research the problem of sound-absorption measuring the coefficient in low frequency range. She designed a device and an experimental model.
    
2. Egorychev Sergey Alexandrovich
   Work: Theoretical and experimental research of sound propagation in inhomogeneous waveguides. Radiophysics Department of University of Nizhny Novgorod.
   Date of birth: March 14, 1974.
   Place of birth: Dzerzhinsk, Gorky (Nizhny Novgorod) region, Russia.
   Education: Graduated from Radiophysics Department of University of Nizhny Novgorod 1997.
   1997-2000: PhD Student at Acoustic Chair, of Radiophysical Department, Nizhny Novgorod State University.
   E-mail: nikvas@rf.unn.runnet.ru.
   Scientific Advisor: Dean of Radiophysical department, head of acoustic chair Prof. Gurbatov S. N., Assistant of Acoustic Chair Kurin V. V.
   Starting in 1997 based on laboratory complex of the acoustic faculty of Nizhny Novgorod State University performed some experiments dedicated to study characteristics of separate normal waves that form the field of waveguide.
   
   • A method for registration of the complex amplitude (the amplitude and the phase) of the PA acoustic field is suggested. Results of laboratory experiments in a few-mode Pekeris waveguide exited by an acoustic parametric array are presented.
   • Results of experimental works on selection of separate normal waves in a few-mode laboratory two-layer hydroacoustics waveguide under condition of limited range of sound propagation are presented. The idea of the approach under discussion is to combine the method of selection by times of arrival of mode pulses to the receiver and the method of selection by synthesized apertures. It is experimentally shown that the combination of these two methods of selection of separate normal waves allowed studying the mode structure of the acoustic field in more detail then in the case of separate application any of these methods.
   • The results of laboratory experiments on propagation of low-frequency acoustic waves produced by a parametric antenna in a few-mode waveguide with a linear depth variation along propagation direction are described. It is shown experimentally that the azimuth structure of separate modes is transformed in the process of sound propagation to area of smaller waveguide depths. The highly directed low-frequency radiation application obtained with the help of the nonlinear sound source has made it possible to convincingly demonstrate the inhomogeneous media spatial filtering properties.
   • The results of laboratory experiments on excitation of low-frequency seismic waves in an hydroacoustic waveguide with metal bottom are described. Highly directed radiation produced by a parametric antenna allows us to selective excite not only water modes of waveguide, but also seismic (longitudinal and shear lateral) waves. It is shown experimentally that the seismic waves contribute significantly to the formation of interference structure of field in waveguide near to a source of a sound.
   These works supported by RFBR grants No 99-02-18354, No 98-02-16402, INTAS grant No 97-11134.
   Publications:
   1. Virovlyansky A. L., Egorychev S. A., Kurin V. V., Pronchatov-Rubtsov N. V. Experimental investigation of modal structure of field generated by a pulse-source in a laboratory hydroacoustic waveguide // J. Acoust. Soc. Am., Vol. 101, No 5, Pt. 2, May 1997, p. 3091.
   2. Egorychev S. A., Kurin V. V., Kustov L. M., Pronchatov-Rubtsov N. V. Experimental investigation of mode structure formation of the field generated by an acoustic parametric array in the Pekeris waveguide // Proceedings of VI session of the Russian Acoustical Society, Moscow, Russia, 14-16 October, 1997.
   3. Virovlyansky A. L., Egorychev S. A., Kurin V. V., Pronchatov-Rubtsov N. V. A test of modified method for selection of normal waves in a laboratory hydroacoustic waveguide // Proceedings of VI session of the Russian Acoustical Society, Moscow, Russia, 14-16 October, 1997.
   4. Gurbatov S. N., Gushchin M. V., Egorychev S. A., Kurin V. V., Kustov L. M., Pronchatov-Rubtsov N. V. On the horizontal structure of a field in separate modes radiated by a parametric antenna in axially nonuniform acoustic waveguides // Preprint Collection on the CD, Joint Meeting 137th regular meeting of the Acoustical Society of America, 2nd convention of the EAA: Forum Acusticum - integrating the 125th German Acoustics DAGA Conference, Berlin, Germany, 14 - 19 March, 1999.
   5. Gurbatov S. N., Egorychev S. A., Zakharov D. A., Kurin V. V., Kustov L. M., Pronchatov-Rubtsov N. V. Excitation of seismic waves by parametric acoustic arrays located in isovelocity waveguides // International Symposium on Nonlinear Acoustics, Gottingen, Germany, 1-4 September, 1999.
   6. Gurbatov S. N., Egorychev S. A., Kurin V. V., Kustov L. M., Pronchatov-Rubtsov N. V. The experimental investigation the mode structure of field of parametric array to the model acoustic waveguide // Sov. Phys. Acoustics, 2000, V.46, No 2. (in press).
   Also he took part in the competitions of student's scientific works and won prize places. Sergey Egorychev is successfully combining his own research and co-advising of course's works of students in the Chair of Acoustics. 19 scientific conferences attended. Scientific interest now is: experimental research of sound wave propagation in ocean waveguides.
    
3. Kurbatov Mikhail
   Work: Dissipation effect on the Anderson localization of sound. Moscow Institute of Physics and Technology.
   Date of birth: August 7, 1975.
   Place of birth: Russia, Moscow region.
   Education: Graduated from Moscow Institute of Physics and Technology in 1998.
   Scientific supervisor: Prof. Samuil A. Rybak.
   The goal of the graduate work is: to investigate the process of destroying of the sound localization due to dissipation. One and two dimensional models are supposed to be considered in two cases: i) random refraction index and ii) random boundaries at the restricted area. Mikhail V. Kurbatov won all- Russian Olympiad on physics among the pupils in 1992. Reveals excellent achievements in all fields of education during 9 terms.
   Scientific activity: Presentation on the 10th course of the International School of Cosmic Ray Astrophysics, Ettore Majorana Center for Scientific Culture, Erice, Sicily, Italy.
    
4. Pisljakov Vladimir Vladimirovich
   Work: One-dimensional acoustical "Black Hole". Moscow Institute of Physics and Technology.
   Date of birth: April 17, 1975.
   Place of birth: Dolgoprudny, Moscow region.
   Education: Entered the Moscow Institute of Physics and Technology in 1991.
   Scientific supervisor: Dr. Mikhail A. Mironov.
   Velocity of the sound, propagating through the narrow tube, depends upon acoustical conductivity of the tube's wall. If the wall conductivity is an elastic one, the effective compressibility of the medium in the tube is increased with respect to rigid wall. Consequently, the sound propagation velocity is decreased. The goal of graduate work of Vladimir Pisljakov is to investigate sound propagation in a tube with variable impedance of the wall. Particular point of interest in this research is to consider the case when sound propagation velocity is decreased smoothly and it reaches a zero level at some point. Propagation time of sound from some cross-section of the tube to this point is infinite. As a result, the wave doesn't reach this point and reflect from it. Being made of absolutely hard materials, the tube, nevertheless, absorbs incident sound. Preliminary results of this work were reported at the conference in Moscow Institute of Physics and Technology in 1996. Now the paper is preparing for submitting to Acoustical Physics Journal.
    
5. Pronin Vadim Anatolievich
   Work: Determination of the angular acoustic intensity radiated by a vibrating body with the arbitrary shape. Moscow Technical University of Telecommunication and Information.
   Date of birth: March 14, 1974.
   Place of birth: Moscow, Russia.
   Education: Graduated from Moscow Technical University of Telecommunication and Information (MTUTI) in 1997.
   Scientific supervisor: Prof. Vsevolod B. Stepanov.
   Now Vladimir changed his professional interest.
    
6. Voronin Egor Vasilyevitch
   Work: Research of nonlinear interaction of acoustic waves in media with a heterogeneity and development of the receiving parametrical arrays. Taganrog State University of Radio Engineering, Department of electrohydroacoustics and medical technique.
   Date of birth: 1976.
   Place of birth: Taganrog, Rostov region.
   Education: Graduated from Taganrog State University of Radio Engineering, Department of electrohydroacoustics and medical technique in 1999.
   Present - PhD student.
   Scientific supervisor: Prof. Vladimir I. Timoshenko.
   The purpose of work is the research of acoustic finite amplitude waves parameters extending in inhomogeneous mediums and parameters of waves interactions, generated in an outcome, and self-interaction.
   The researches are conducted by a method of mathematical simulation. For mediums with a changed velocity of a sound the expression for account of performances of parametrical arrays working on difference frequency and on harmonics of pump waves is introduced, and for a basis the solution because of equations Khohlov-Zabolotskaiy-Kuznetsov is taken. The model of parameters account was reduced to "seaming" a solution on the boundary of mediums with various velocities of a sound, accepting a bundle incident on the boundary for a virtual pump antenna. Doing a passage to the limit to an infinite amount of stratums with small their thickness, the final expression permitting to conduct account of performances of parametrical antennas in mediums with linear and periodic modification of a velocity of a sound along a line of distribution of pump waves is obtained. For definition of modifications of distribution directions and phases of waves the equation such as an eikonal equation, with a right member as the relation of sound velocities on the boundary of adjacent stratums of a medium is introduced. Is shown, that the distribution of a wave of final amplitude even in a medium from a constant by a velocity of a sound results in a modification of an extending wave phase. And the modification of a sound velocity on a line of distribution of waves results in a modification of geometry of a bundle because of a waves refraction.
   Publications:
   1. Voronin E. V., Voronin V. A., Kiritchenko I. A. Peculiarities of application of the parametrical array ecological researches of water media Summ. ISC "I Gagarin reading", 1995. T.27.
   2. Voronin E. V., Grineva S., Dmitrieva I. Account of the characteristics of the acoustic parametrical array of a sound. The report on 43 student's scientific conferences TSURE.1996.
   3. Voronin E. V., Voronin V. A. Using of receiving parametrical arrays for research of a media inhomogeneities. The theses of the reports on a conference "Physics and engineering of a ultra sound". SPETU.S.-Petersburg 1997.
   4. Voronin E. V., Voronin V. A., Kiritchenko I. A. Parametrical hydroacoustic complex for hydrophysical researches of ocean. Third RSTC "Technical cybernetics, radioelectronics and control systems". Taganrog, TSURE, 1996.
   5. E. V. Voronin, V. A. Voronin, G. G. Pashkov. A research of interaction of acoustic waves with fields of a wave nature. Information's TSURE. Special issue "Materials XLIII scientifically - technical conference". Taganrog: TSURE, 1998. N3 (9).

1. Brosalin Andrey Vitalievich
   Work: Research of methods for parametrical profiler development intended for stratified bottom probing.
   Date of birth: May 16, 1972.
   Place of birth: Russia, Kuibyshev region, Toliatti.
   Education: Graduated from the Taganrog State University of Radio Engineering, Department of electrohydroacoustics and medical technique in 1995.
   1997-present - PhD student.
   Publicaitions:
   1. Borisov S, Brosalin A. A shaper of signals for a ecological locator of media, Thesis of the report in the collection 'HT' Gagarinskie chtenia 1995, Moscow.
   2. Borisov S, Brosalin A. Application kepstr of the analysis for the sanction echo-impulse Labour the third Russia, TRI, Taganrog.
   3. Tarasov S., Voronin V., Borisov S, Brosalin A. Research and analysis of the characteristics of a parametrical profiler of bottom adjournment, Collection the third, Novosibirsk.
   4. Tarasov S., Brosalin A. A parametrical hydroacoustic profiler for research of marine bottom deposits the Thesis of the report, S-Petersburg.
   
    
2. Economov Andrey Nicolaevich
   

   Prof. Nikolai Dubrovsky is presenting student's grant

   Work: Research of nonlinear acoustical properties of metals. Physical department of Moscow State University.
   Date of birth: May, 19, 1974.
   Place of birth: Russia, Moscow.
   Education: Graduated from Physics Department of Moscow State University in 1997.
   1998- present PhD student
   E-mail: economov@orc.ru.
   Publication:
   "Absorption of longitudinal sound waves in polycrystalline titanium at the low temperature"."Vestnik Moscovskogo Universiteta" (in Russian), 1997, No.4.
    
3. Kochkin Alexander
   Work: Theoretical and experimental research of reconstruction of vibration displacement and stress fields in structures through the measurements on a part of structure surface. Solid State Physics Department of Moscow State Engineering Physical Institute.
   Date of birth: July 26, 1973.
   Place of birth: Moscow, Russia.
   Education: Graduated from Solid State Physics Department of Moscow State Engineering Physical Institute (Technical University) 1996.
   Scientific supervisor: Prof. Yuri I. Bobrovnitskii.
   Research interest: To develop method of vibration field reconstruction in unmeasured (inaccessible) region of a forced vibrating thin cylindrical shell using the data from measurement (accessible) region.
   Results: The method of field reconstruction is developed. The vibration field of the shell was modeled by a finite sum of normal waves, amplitudes of which were determined by equating the modeling values to the data. The SVD technique was used in the inverse procedure for parameter identification. Most attention was paid to finding an appropriate procedure for choosing the best model of the shell which minimized the reconstruction error. For the measurement error 0.08 of the experiment conducted, the reconstruction error varied from 0.2 to 0.7 as the measurement region diminished from 0.7 to 0.3.
   Publications:
   1. T. M. Tomilina, Yu. I. Bobrovnitskii, V. B. Yashkin & A. A. Kochkin "Power output of noise sources operating near elastic scatterers of finite dimensions"// Journal of Sound and Vibration, 1999, v.226, N2.
   2. A. A. Kochkin "Experimental Reconstruction of Vibration Field in a Cylindrical Shell"// Joint meeting 138th meeting of ASA/2nd convention of EAA/25th German acoustics DEGA conference, Berlin 99.
   3. Yu. I. Bobrovnitskii, M. P. Korotkov, A. A. Kochkin, and T. M. Tomilina "Setting and Solving the Problem of Wave-field Reconstruction in Elastic Structures"// Doclady Physics, Vol. 43, No. 3, 1998, pp. 177-180.
   4. A. A. Kochkin "Experimental Investigation of the Problem of Vibration Field Reconstruction"// Proceedings of VI session of the Russian Acoustical Society, Moscow 1997.
   After finishing in 1999 Post Graduate Studies, Alexander works as a scientific worker in Mechanical Engineering Research Institute. The topic of his present work is connected with attenuation of low frequency vibrations.
    
4. Morozov Sergey Alexandrovich
   Work: Functional methods of the reconstruction of internal field in the scatters. Physical Department of Moscow State University.
   Date of birth: November 15, 1972.
   Place of birth: Russia, Sverdlovsk region, Rezh.
   Education: Graduated from Moscow State University, Physical Department, 1997.
   1998- present - PhD student.
   E-mail: burov@acs373v.phys.msu.su .
   Scientific supervisor: Professor V. A. Burov.
   Scientific research of S. A. Morozov deals with the solution of the inverse scattering problem of acoustic waves by strong scatters. It is necessary to take into account processes of multiply scattering. The inverse problem is nonlinear and ill posed; methods for its solution have not been investigated in details. S. A. Morozov investigates the new method of reconstruction of inner field (distorted by the scattering) based on Marchenko-Newton-Rose equation. Knowledge of the inner field allows reconstructing the scatters. Algorithm of the competitive solution of this inverse problem has been worked out and competitive programs for its realization have been produced. To check efficiency of the algorithm the strict solution of the direct modeling problem has been obtained for strong scatters (the Born series diverges). S. A. Morozov has studied mathematical aspects of the scattering theory, competitive methods of wave physics and programming methods. Results obtained are interesting, though they are needed in further analysis and perfection. It is very important that these are the first competitive results in the framework of the new investigated method of solution of the inverse scattering problem. This scientific research supposes both the further development of the general theory of inverse scattering in acoustics and realization of specific algorithms for applied problems (for example, medical and ocean inverse scattering problems).
    
5. Yashkin Vladimir
   Work: Sound radiation of extended sources in a bounded space. Solid State Physics Department of Moscow State Engineering Physical Institute.
   Date of birth: September 28, 1973.
   Place of birth: Moscow, Russia.
   Education: Graduated from Moscow State Engineering Physical Institute (Technical University), Department of Solid State Physics in 1996.
   Scientific supervisor: Prof. Yuri I. Bobrovnitskii.
   Scientific interest: To design a source model for calculation of acoustical field, created by a sphere with given normal velocity, near a finite circular elastic plate by means of ESM. And to investigate the influence of presence of an elastic body on the total power flow of the sphere.
   Results: Total radiation power flow and radiation impedance of a spherical sound source with given normal velocity near a finite circular elastic plate are calculated using ESM. It is shown that total radiation power flow in presence of the elastic scatterers is increased at certain frequencies by several orders of magnitude compared to that in free space. The increase is due to the effects of resonant re-radiation and "source order lowering".
   Publications:
   1. T. M. Tomilina, Yu. I. Bobrovnitskii, V. B. Yashkin & A. A. Kochkin "Power output of noise sources operating near elastic scatterers of finite dimensions"// Journal of Sound and Vibration, 1999, v.226, N2.
   2. V. B. Yashkin "Radiation of a sphere near reflecting planes"// Joint meeting 138th meeting of ASA/2nd convention of EAA/25th German acoustics DEGA conference, Berlin 99.
   3. V. B. Yashkin "Radiation Power flux from a Spherical Sound Source near Reflecting Surfaces"// Acoustical Physics, Vol. 44, No. 5, 1998, pp. 598-604.
   4. V. B. Yashkin "Influence of Reflecting Surfaces on the Radiation Power of a Spherical Sound Source"// Proceedings of VI session of the Russian Acoustical Society, Moscow 1997.
   After finishing in 1999 Post Graduate Studies, Vladimir works as a scientific worker in Laboratory of Structural Acoustics of Mechanical Engineering Research Institute. The topic of his present work is amplification of the power output of mechanical sound sources due to near-by elastic scatterers.