DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)最新文献
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822149
O. Piddubniak, N. Piddubniak
The resonance scattering of plane sound waves from a circular cylindrical thin elastic shell with a vacuum inside is investigated. The R-matrix method for suppression of the background contribution in the total form-function and for extraction of the spectral information (positions and widths of the spectral lines) is used. The resonance characteristics of the multipole order m=2 are analyzed in detail. The singularities which permit to distinguish the numerical resonance parameters for sound scattering from cylindrical and spherical elastic shells are discussed.
{"title":"Spectral parameters of resonance sound scattering from a circular cylindrical thin elastic shell","authors":"O. Piddubniak, N. Piddubniak","doi":"10.1109/DIPED.1999.822149","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822149","url":null,"abstract":"The resonance scattering of plane sound waves from a circular cylindrical thin elastic shell with a vacuum inside is investigated. The R-matrix method for suppression of the background contribution in the total form-function and for extraction of the spectral information (positions and widths of the spectral lines) is used. The resonance characteristics of the multipole order m=2 are analyzed in detail. The singularities which permit to distinguish the numerical resonance parameters for sound scattering from cylindrical and spherical elastic shells are discussed.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134431396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822122
D. Shepelsky
An inverse problem for a non-homogeneous (stratified) dispersive chiral slab is considered in the frequency domain. The problem is treated as a holomorphic factorization problem in the frequency complex plane. The reconstruction algorithm is based on the reformulation of the scattering problem as a Riemann-Hilbert problem. Uniqueness in the parameter reconstruction under normal incidence of the exciting waves is studied.
{"title":"Inverse scattering problem for a stratified dispersive chiral medium","authors":"D. Shepelsky","doi":"10.1109/DIPED.1999.822122","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822122","url":null,"abstract":"An inverse problem for a non-homogeneous (stratified) dispersive chiral slab is considered in the frequency domain. The problem is treated as a holomorphic factorization problem in the frequency complex plane. The reconstruction algorithm is based on the reformulation of the scattering problem as a Riemann-Hilbert problem. Uniqueness in the parameter reconstruction under normal incidence of the exciting waves is studied.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"17 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124360352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822120
A. Ramm
Summary form only given, as follows. An overview of the author's results is given. The inverse problems for obstacle, geophysical and potential scattering are considered. The basic method for proving uniqueness theorems in one- and multi-dimensional inverse problems is discussed and illustrated by numerous examples. The method is based on property C for pairs of differential operators. Property C stands for completeness of the sets of products of solutions to homogeneous differential equations. To prove a uniqueness theorem in the inverse scattering problem one assumes that there are two operators which generate the same scattering data. This assumption allows one to derive an orthogonality relation from which, via property C, the uniqueness theorem follows. New results are discussed. These include property C for ordinary differential equations, inversion of I-function (impedance function), inversion of incomplete scattering data (for example, the phase shift of s-wave without the knowledge of bound states and norming constants but assuming a priori that the potential has compact support, etc). Analytical solution of the ground-penetrating radar problem is outlined. Open problems are formulated.
{"title":"Multidimensional inverse scattering problems","authors":"A. Ramm","doi":"10.1109/DIPED.1999.822120","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822120","url":null,"abstract":"Summary form only given, as follows. An overview of the author's results is given. The inverse problems for obstacle, geophysical and potential scattering are considered. The basic method for proving uniqueness theorems in one- and multi-dimensional inverse problems is discussed and illustrated by numerous examples. The method is based on property C for pairs of differential operators. Property C stands for completeness of the sets of products of solutions to homogeneous differential equations. To prove a uniqueness theorem in the inverse scattering problem one assumes that there are two operators which generate the same scattering data. This assumption allows one to derive an orthogonality relation from which, via property C, the uniqueness theorem follows. New results are discussed. These include property C for ordinary differential equations, inversion of I-function (impedance function), inversion of incomplete scattering data (for example, the phase shift of s-wave without the knowledge of bound states and norming constants but assuming a priori that the potential has compact support, etc). Analytical solution of the ground-penetrating radar problem is outlined. Open problems are formulated.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114569488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822137
G. Bit‐Babik, P. Shubitidze, R. Zaridze, D. Karkashadze, K. Tavzarashvili, A. Bijamov
The modification of the method of auxiliary sources (MAS) for solving the electromagnetic (EM) diffraction problems is discussed. The presented approach explores the integrated auxiliary sources reducing in may cases the number of unknowns of a particular problem. This is especially important for scattering problems on open structures, scatterers with thin geometry, dielectric scatterers with very high permittivity. The results of particular problems solution are presented to demonstrate the capabilities of the method (e.g. diffraction on thin dielectric parallelepiped and scattering by perfectly conducting cube with one open side).
{"title":"Generalized method of auxiliary sources (integrated auxiliary sources)","authors":"G. Bit‐Babik, P. Shubitidze, R. Zaridze, D. Karkashadze, K. Tavzarashvili, A. Bijamov","doi":"10.1109/DIPED.1999.822137","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822137","url":null,"abstract":"The modification of the method of auxiliary sources (MAS) for solving the electromagnetic (EM) diffraction problems is discussed. The presented approach explores the integrated auxiliary sources reducing in may cases the number of unknowns of a particular problem. This is especially important for scattering problems on open structures, scatterers with thin geometry, dielectric scatterers with very high permittivity. The results of particular problems solution are presented to demonstrate the capabilities of the method (e.g. diffraction on thin dielectric parallelepiped and scattering by perfectly conducting cube with one open side).","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115459492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822142
A. Boryssenko
This paper presents a 2-D scalar numerical time-domain model with evident physical meaning for simulation of electromagnetic diffraction in the act of electromagnetic sounding implemented by ground-penetrating microwave radar. The data obtained as a result of the radar survey should be interpreted for detection, discrimination and location of hidden objects caused scattering phenomena. The proposed approach allows consideration of the basic physical principles, governing these physical events to form an electromagnetic image of the subsurface region with simulated radar returns. It can also be applied to real radar image processing.
{"title":"Time-domain diffraction phenomena simulation for subsurface electromagnetic sounding","authors":"A. Boryssenko","doi":"10.1109/DIPED.1999.822142","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822142","url":null,"abstract":"This paper presents a 2-D scalar numerical time-domain model with evident physical meaning for simulation of electromagnetic diffraction in the act of electromagnetic sounding implemented by ground-penetrating microwave radar. The data obtained as a result of the radar survey should be interpreted for detection, discrimination and location of hidden objects caused scattering phenomena. The proposed approach allows consideration of the basic physical principles, governing these physical events to form an electromagnetic image of the subsurface region with simulated radar returns. It can also be applied to real radar image processing.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125622089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822140
F. Bogdanov, D. Karkashadze, D. A. Metskhvarishvili
The full-mode electrodynamic analysis together with numerical experiments are used to design a passband microwave filter with the desired characteristics. The advantage of this approach compared with circuit element techniques is shown.
{"title":"Design of direct-coupled cavity microwave filters using full-mode electrodynamic analysis","authors":"F. Bogdanov, D. Karkashadze, D. A. Metskhvarishvili","doi":"10.1109/DIPED.1999.822140","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822140","url":null,"abstract":"The full-mode electrodynamic analysis together with numerical experiments are used to design a passband microwave filter with the desired characteristics. The advantage of this approach compared with circuit element techniques is shown.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131376480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822154
L.M. Pasnak, P. Savenko
We consider the synthesis problem of an antenna array, which consists of thin wire radiators, through the given amplitude directivity pattern (DP) taking into account the mutual coupling of radiators and the vector character of the electromagnetic field. The regularization functional, which regards the mean-square deviations of components of the synthesis and the given magnitudes, and the limitation on the norm of extrinsic currents, is used as a criterion of optimization. The numerical solution of the synthesis problem is reduced to finding solutions of the nonlinear system of algebraic equations. In the iterative process we implement an implicit scheme of the successive approximation method. The analysis problem is reduced to a system of linear integral Poklington type equations. The example of the synthesis of an antenna array with conical two-arm spiral radiators is presented.
{"title":"Numerical solving of the synthesis problem of conical spiral antenna array with regard the mutual coupling","authors":"L.M. Pasnak, P. Savenko","doi":"10.1109/DIPED.1999.822154","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822154","url":null,"abstract":"We consider the synthesis problem of an antenna array, which consists of thin wire radiators, through the given amplitude directivity pattern (DP) taking into account the mutual coupling of radiators and the vector character of the electromagnetic field. The regularization functional, which regards the mean-square deviations of components of the synthesis and the given magnitudes, and the limitation on the norm of extrinsic currents, is used as a criterion of optimization. The numerical solution of the synthesis problem is reduced to finding solutions of the nonlinear system of algebraic equations. In the iterative process we implement an implicit scheme of the successive approximation method. The analysis problem is reduced to a system of linear integral Poklington type equations. The example of the synthesis of an antenna array with conical two-arm spiral radiators is presented.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132657147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822131
S.M. Yaroshko, S.A. Yaroshko
To solve the eigenvalue problem with a completely continuous operator the modified successive approximation method is used. A method to estimate the linear part of the calculation errors is proposed. The questions of a priori estimation of the calculated characteristic numbers of the operator is discussed.
{"title":"Error estimation of characteristic numbers in the modified successive approximation method","authors":"S.M. Yaroshko, S.A. Yaroshko","doi":"10.1109/DIPED.1999.822131","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822131","url":null,"abstract":"To solve the eigenvalue problem with a completely continuous operator the modified successive approximation method is used. A method to estimate the linear part of the calculation errors is proposed. The questions of a priori estimation of the calculated characteristic numbers of the operator is discussed.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115614451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822124
N. Beletskii, J.V. Bludov
The paper deals with the theoretical investigation of surface polaritons (SP) in weakly disordered superlattice (WDSL), formed of the finite number of 2-dimensional electron systems (2DES). The weak disorderedness consists in the fact that one of the inner 2DES was shifted from the position of periodicity on some distance /spl Delta/. It is shown, that under the integer quantum Hall effect (IQHE) conditions all characteristics of SP are represented by the quantized values. The conditions under which the SP phase and group velocities in the finite WDSL can be considerably less than that in the isolated 2DES are defined.
{"title":"Propagation of surface polaritons in finite superlattice with one shifted layer placed into the quantizing magnetic field","authors":"N. Beletskii, J.V. Bludov","doi":"10.1109/DIPED.1999.822124","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822124","url":null,"abstract":"The paper deals with the theoretical investigation of surface polaritons (SP) in weakly disordered superlattice (WDSL), formed of the finite number of 2-dimensional electron systems (2DES). The weak disorderedness consists in the fact that one of the inner 2DES was shifted from the position of periodicity on some distance /spl Delta/. It is shown, that under the integer quantum Hall effect (IQHE) conditions all characteristics of SP are represented by the quantized values. The conditions under which the SP phase and group velocities in the finite WDSL can be considerably less than that in the isolated 2DES are defined.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130089890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822143
A. Boryssenko
This paper reviews topics concerning processing of electromagnetic and acoustic signals with some features resulted from their propagation through a real channel where multipath propagation occurs. The processing algorithm should be used to solve the inverse problem of restoring the signal, which is distorted by the channel. This algorithm, implemented by a time-reversal or non-linear echo-based concept, is discussed.
{"title":"Time-reversal algorithm for wave inverse problems in channels with multipath non-stable propagation","authors":"A. Boryssenko","doi":"10.1109/DIPED.1999.822143","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822143","url":null,"abstract":"This paper reviews topics concerning processing of electromagnetic and acoustic signals with some features resulted from their propagation through a real channel where multipath propagation occurs. The processing algorithm should be used to solve the inverse problem of restoring the signal, which is distorted by the channel. This algorithm, implemented by a time-reversal or non-linear echo-based concept, is discussed.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130067152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)
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