Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Olga D. Rumyantseva"'
Publikováno v:
Journal of Inverse and Ill-posed Problems. 29:407-420
The inverse wave problem of tomographic type is considered. It consists in reconstruction of several scatterer’s characteristics in the form of spatial distributions for sound speed, medium density, absorption coefficient and power index of its fre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ba1a4fc719f12c0bf0d12d2242dd8bd4
https://doi.org/10.1515/jiip-2020-0141
https://doi.org/10.1515/jiip-2020-0141
Autor:
Olga D. Rumyantseva, K. V. Dmitriev
Publikováno v:
Doklady Physics. 65:301-307
An acoustic field scattered by a single inhomogeneity consists of components of different orders of multipolarity. For symmetric or weak-contrast inhomogeneities of a small wave size, these components are related to multipole components of an initial
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e1e1ad143de10b114cc1f7fe5c24dd3
https://doi.org/10.1134/s1028335820090037
https://doi.org/10.1134/s1028335820090037
Publikováno v:
Bulletin of the Russian Academy of Sciences: Physics. 84:210-214
The scattering of a monochromatic wave by an inhomogeneity with the small wave size is considered. The scattering coefficients are introduced, and sets of their allowable values are obtained with and without absorption inside the inhomogeneity. The s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b1eb251dc4b21937b9bbce16cd40784
https://doi.org/10.3103/s1062873820020094
https://doi.org/10.3103/s1062873820020094
Publikováno v:
Bulletin of the Russian Academy of Sciences: Physics. 83:59-63
A procedure is described for reconstructing separately the spatial distributions of the absorption coefficient, speed of sound, and the intrinsic temperature of an investigated object by means of acoustic thermotomography. The use of radiation focusi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6074c669cd4bf3d574efd63937531f2
https://doi.org/10.3103/s1062873819010052
https://doi.org/10.3103/s1062873819010052
Publikováno v:
Bulletin of the Russian Academy of Sciences: Physics. 83:64-69
Different ways of coding radiated signals that probe a tomographized object such as a liquid medium are compared in order to reconstruct the spatial distribution of acoustic nonlinear parameters using a small number of transducers. The results from r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::960fcc919fde399b83639cf441ee8f89
https://doi.org/10.3103/s1062873819010131
https://doi.org/10.3103/s1062873819010131
Publikováno v:
Moscow University Physics Bulletin. 73:470-474
An algorithm for estimating the geometrical and phase corrections for receiving–transmitting transducers of a ring antenna array of an ultrasonic tomograph is proposed. These corrections should be taken into account at the stage of the reconstructi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b661df503c40217b1a2f475e945b3978
https://doi.org/10.3103/s0027134918050077
https://doi.org/10.3103/s0027134918050077
Publikováno v:
Acoustical Physics. 64:590-595
A possibility to create controlled anisotropic illumination in an acoustic tomographic system with correlation processing of experimental data is considered. Fundamental difficulties encountered in setting up anisotrpic illumination in a ring array s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a59dd17148639a49731bdc28e7a8b03
https://doi.org/10.1134/s1063771018040036
https://doi.org/10.1134/s1063771018040036
Publikováno v:
Bulletin of the Russian Academy of Sciences: Physics. 82:35-39
A procedure is proposed for separating contributions to the scatterer function by inhomogeneities of the speed of sound, density of a medium, and coefficient of absorption. The scatterer function is reconstructed by solving the inverse problem. The p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef04bdcebe6baf39b8b65480b3807388
https://doi.org/10.3103/s1062873818010276
https://doi.org/10.3103/s1062873818010276
Autor:
Andrey S. Shurup, Olga D. Rumyantseva
Publikováno v:
Acoustical Physics. 63:751-768
Numerical implementation of the two-dimensional functional-analytical Novikov–Agaltsov algorithm is considered and its possibilities are discussed. This algorithm is intended for reconstructing combined scalar-vector inhomogeneities describing spat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7c9f6a3d59a3681966dc432b112961b
https://doi.org/10.1134/s1063771017060136
https://doi.org/10.1134/s1063771017060136
Publikováno v:
Bulletin of the Russian Academy of Sciences: Physics. 81:915-919
Physical, mathematical, and engineering problems related to creating two fundamentally different types of tomographs (so-called linear and nonlinear tomographs) are considered. The tomographs under development are designed for diagnosing pathological
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d29c472a1afb40993f0bc22776a25dec
https://doi.org/10.3103/s106287381708010x
https://doi.org/10.3103/s106287381708010x