Pub Date : 2006-10-01DOI: 10.1109/DIPED.2006.314283
A. Sveshnikov, A. N. Bogolyubov, M. Malykh, J. Mukhartova
The scalar problem of oscillation excitation in the cylindrical waveguide, when the contraction of the operator on the cross section perpendicular to waveguide's axis is an arbitrary elliptic operator, and the boundary condition is the condition of the third kind is considered. It's shown, that it's effective to use the method of generalized Fourier-transformation for such a problem, and the requirement of generalized Fourier-transform existence is the condition, singling the solution, that is the superposition of waves propagating from the source
{"title":"The Solution of the Boundary Problem for an Arbitrary Elliptic Operator Satisfying the Radiation Condition","authors":"A. Sveshnikov, A. N. Bogolyubov, M. Malykh, J. Mukhartova","doi":"10.1109/DIPED.2006.314283","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314283","url":null,"abstract":"The scalar problem of oscillation excitation in the cylindrical waveguide, when the contraction of the operator on the cross section perpendicular to waveguide's axis is an arbitrary elliptic operator, and the boundary condition is the condition of the third kind is considered. It's shown, that it's effective to use the method of generalized Fourier-transformation for such a problem, and the requirement of generalized Fourier-transform existence is the condition, singling the solution, that is the superposition of waves propagating from the source","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131331849","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314297
V. Yatsyk
Numerical analysis of the diffraction by a transversely non-homogeneous, isotropic, nonmagnetic, linearly polarized, weakly nonlinear layered dielectric structures (with Kerr-like nonlinearity) is performed in the resonant frequency range when the parameter of cubic susceptibility takes positive and negative values. It is shown that as the excitation field intensity increases the diffraction characteristics acquire essentially different properties for positive and negative values of susceptibility. For a layered structure consisting of layers with positive and negative susceptibility of the enveloping medium the effects inherent to environments with positive and negative value of susceptibility are observed in certain areas of variation of the excitation field intensity
{"title":"Diffraction on Layered Dielectric Structure with Weakly Kerr-Like Nonlinearity","authors":"V. Yatsyk","doi":"10.1109/DIPED.2006.314297","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314297","url":null,"abstract":"Numerical analysis of the diffraction by a transversely non-homogeneous, isotropic, nonmagnetic, linearly polarized, weakly nonlinear layered dielectric structures (with Kerr-like nonlinearity) is performed in the resonant frequency range when the parameter of cubic susceptibility takes positive and negative values. It is shown that as the excitation field intensity increases the diffraction characteristics acquire essentially different properties for positive and negative values of susceptibility. For a layered structure consisting of layers with positive and negative susceptibility of the enveloping medium the effects inherent to environments with positive and negative value of susceptibility are observed in certain areas of variation of the excitation field intensity","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130125065","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314284
O. Drobakhin, A. V. Doronin
Application of neural network ideology for layered dielectric structure inverse problem solution is under consideration. The 3-layered feed-forward with activation function as a sigmoid (S-shaped) was chosen. The real part of reflection coefficient at many frequencies is used as input signal. Levenberg-Marquardt algorithm was used for training of the network. Some results of numerical simulation for two-layered structure in presence of Gaussian additive noise are demonstrated
{"title":"Neural Network Inverse Method for Dielectric Structures by Multifrequency Signals","authors":"O. Drobakhin, A. V. Doronin","doi":"10.1109/DIPED.2006.314284","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314284","url":null,"abstract":"Application of neural network ideology for layered dielectric structure inverse problem solution is under consideration. The 3-layered feed-forward with activation function as a sigmoid (S-shaped) was chosen. The real part of reflection coefficient at many frequencies is used as input signal. Levenberg-Marquardt algorithm was used for training of the network. Some results of numerical simulation for two-layered structure in presence of Gaussian additive noise are demonstrated","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116897718","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314290
F. Yaman, A. Yapar
A regularized Newton iterative method is presented for the determination of one-dimensional profile of an inhomogeneous layer located on an inhomogeneous impedance plane. By using the Fourier transformation of field expressions, the problem is first reduced to a system of non-linear operator equations which can be solved through regularized Newton method. Numerical simulations are carried out to test the applicability and the effectiveness of the method
{"title":"One - Dimensional Profile Inversion of a Planar Layer Bounded by an Inhomogeneous Impedance Boundary","authors":"F. Yaman, A. Yapar","doi":"10.1109/DIPED.2006.314290","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314290","url":null,"abstract":"A regularized Newton iterative method is presented for the determination of one-dimensional profile of an inhomogeneous layer located on an inhomogeneous impedance plane. By using the Fourier transformation of field expressions, the problem is first reduced to a system of non-linear operator equations which can be solved through regularized Newton method. Numerical simulations are carried out to test the applicability and the effectiveness of the method","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123694986","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314310
Y. Kunets’, V. Matus, V.V. Porokhovs'kyj, V. O. Mishchenko
An algorithm is proposed for remote definition of physical-mechanical and geometric parameters of thin spatial elastic inclusions with varying thickness. It is assumed that mechanical characteristics of inhomogeneity and matrix differ insignificantly in comparison with the inhomogeneity relative thickness. The elastic longitudinal waves are sounding waves and the unknown parameters are defined in terms of the scattering amplitudes of these waves in the Fraunhoffer zone
{"title":"Remote Definition of Mechanical and Geometric Parameters of Thin Spatial Plane Inclusions of Low Contrast","authors":"Y. Kunets’, V. Matus, V.V. Porokhovs'kyj, V. O. Mishchenko","doi":"10.1109/DIPED.2006.314310","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314310","url":null,"abstract":"An algorithm is proposed for remote definition of physical-mechanical and geometric parameters of thin spatial elastic inclusions with varying thickness. It is assumed that mechanical characteristics of inhomogeneity and matrix differ insignificantly in comparison with the inhomogeneity relative thickness. The elastic longitudinal waves are sounding waves and the unknown parameters are defined in terms of the scattering amplitudes of these waves in the Fraunhoffer zone","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122732623","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314285
V.N. Dumin, O. Dumina, V. Katrich
The nonstationary three-dimensional radiation problem is transformed into the problem for one-dimensional evolutionary equations by means of the construction of modal basis for electromagnetic field with arbitrary time dependence. Transient electromagnetic fields in infinite space filled with inhomogeneous in radial direction transient medium without losses are presented by spherical modes. The expansion coefficients of transient electromagnetic field on the modal basis are found from the set of evolutionary equations which describe independent propagation of the spherical modes. The transient electromagnetic field can be found without Fourier transform application directly by means of one-dimensional FDTD method for arbitrary medium or using Laplace transform and wave splitting for the case of homogeneous stationary medium. The above mentioned methods are compared with the three-dimensional FDTD method for the case of excitation of small loop by transient current
{"title":"Comparative Analysis of the Analytical and Numerical Solutions of Transient Wave Propagation Problem","authors":"V.N. Dumin, O. Dumina, V. Katrich","doi":"10.1109/DIPED.2006.314285","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314285","url":null,"abstract":"The nonstationary three-dimensional radiation problem is transformed into the problem for one-dimensional evolutionary equations by means of the construction of modal basis for electromagnetic field with arbitrary time dependence. Transient electromagnetic fields in infinite space filled with inhomogeneous in radial direction transient medium without losses are presented by spherical modes. The expansion coefficients of transient electromagnetic field on the modal basis are found from the set of evolutionary equations which describe independent propagation of the spherical modes. The transient electromagnetic field can be found without Fourier transform application directly by means of one-dimensional FDTD method for arbitrary medium or using Laplace transform and wave splitting for the case of homogeneous stationary medium. The above mentioned methods are compared with the three-dimensional FDTD method for the case of excitation of small loop by transient current","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134631101","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314314
Y. Topolyuk
Problem of finding pseudo-solutions of the free phase equation an isometric operator in Hilbert spaces is considered. Convergence property of the gradient method are proven
研究了希尔伯特空间中等距算子自由相方程的伪解问题。证明了梯度法的收敛性
{"title":"Convergence of Gradient Method for Free Phase Problem with Isometric Operator","authors":"Y. Topolyuk","doi":"10.1109/DIPED.2006.314314","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314314","url":null,"abstract":"Problem of finding pseudo-solutions of the free phase equation an isometric operator in Hilbert spaces is considered. Convergence property of the gradient method are proven","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117146554","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314322
A. Sydor
For unsymmetrical compound electromagnetic systems ramified to level 2, models of main reliability characteristics are worked out for the cases when the lifetime of ageing output elements is circumscribed by the Weibull distribution. These models make it possible to compare variants of system structures depending on requirements of production process
{"title":"Analysis of Reliability Indices for Compound Electromagnetic Systems","authors":"A. Sydor","doi":"10.1109/DIPED.2006.314322","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314322","url":null,"abstract":"For unsymmetrical compound electromagnetic systems ramified to level 2, models of main reliability characteristics are worked out for the cases when the lifetime of ageing output elements is circumscribed by the Weibull distribution. These models make it possible to compare variants of system structures depending on requirements of production process","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123899950","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314289
O. Ozdemir, Y. Altuncu
A new, simple and fast method for the solution of electromagnetic scattering problems related to perfectly conducting objects of arbitrary shape is presented. The method is based on the representation of the conducting object in terms of a circular one having higher order impedance boundary condition on its surface. Through the Taylor expansion of the total field on the minimum circle covering the object, a universal relation between higher order surface impedances and the shape of the object is obtained. Numerical simulations show that the method yields quite accurate results
{"title":"On the Relation between Surface Impedance and Shape of the Perfectly Conducting Objects","authors":"O. Ozdemir, Y. Altuncu","doi":"10.1109/DIPED.2006.314289","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314289","url":null,"abstract":"A new, simple and fast method for the solution of electromagnetic scattering problems related to perfectly conducting objects of arbitrary shape is presented. The method is based on the representation of the conducting object in terms of a circular one having higher order impedance boundary condition on its surface. Through the Taylor expansion of the total field on the minimum circle covering the object, a universal relation between higher order surface impedances and the shape of the object is obtained. Numerical simulations show that the method yields quite accurate results","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"152 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116701269","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314293
Z. Modebadze, B. Partcvania, T. SurguIadze, L. Shoshiashvili
Influence of EM radiation at 900 MHz on mollusk neuron placed in TEM cell is investigated. TEM cell model for 900 MHz after numerical study is manufactured and validated. Spatial absorption rate and temperature rise is calculated using FDTD method. Performed series of experiments with experimental results are presented and discussed. Results of experimental investigation RF EMF influence on the neuron functional activity-habituation, which is regarded as simplest kind of learning are presented
{"title":"Experimental and Numerical Study of Electromagnetic Field Influence on Mollusk Neurons","authors":"Z. Modebadze, B. Partcvania, T. SurguIadze, L. Shoshiashvili","doi":"10.1109/DIPED.2006.314293","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314293","url":null,"abstract":"Influence of EM radiation at 900 MHz on mollusk neuron placed in TEM cell is investigated. TEM cell model for 900 MHz after numerical study is manufactured and validated. Spatial absorption rate and temperature rise is calculated using FDTD method. Performed series of experiments with experimental results are presented and discussed. Results of experimental investigation RF EMF influence on the neuron functional activity-habituation, which is regarded as simplest kind of learning are presented","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128585638","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}
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