{"title":"Electromagneton a new type of electromagnetic oscillations","authors":"G. Karapetyan","doi":"10.1109/AEM.1996.873120","DOIUrl":"https://doi.org/10.1109/AEM.1996.873120","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130406548","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}
The availability of numerous High Performance Computing (HPC) platforms provide the necessary computational power to pioneer research into otherwise unsolvable, in terms of execution time required, electromagnetic problems such as the focusing of the pulse modulated radiation of a concentric waveguide array in biological tissues and the analyse of electrically large planar scattering structures. Using HPC and parallel programming techniques have reduced the computational times of solving large electromagnetic problems from the order of months to days, even hours, The solution of such problems has direct implications in clinical environments such treatment planning of tumours using hypothermia techniques.
{"title":"A re configurable HPC platform to support the solution of large electromagnetic problems","authors":"A. Marsh","doi":"10.1109/AEM.1996.873075","DOIUrl":"https://doi.org/10.1109/AEM.1996.873075","url":null,"abstract":"The availability of numerous High Performance Computing (HPC) platforms provide the necessary computational power to pioneer research into otherwise unsolvable, in terms of execution time required, electromagnetic problems such as the focusing of the pulse modulated radiation of a concentric waveguide array in biological tissues and the analyse of electrically large planar scattering structures. Using HPC and parallel programming techniques have reduced the computational times of solving large electromagnetic problems from the order of months to days, even hours, The solution of such problems has direct implications in clinical environments such treatment planning of tumours using hypothermia techniques.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129945854","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}
{"title":"Numerical model propagation of electromagnetic waves in turbulent flows","authors":"V. Spitsyn","doi":"10.1109/AEM.1996.873093","DOIUrl":"https://doi.org/10.1109/AEM.1996.873093","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121443976","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}
{"title":"The application of advanced numerical simulation techniques to electromagnetic problems","authors":"C. Christopoulos","doi":"10.1109/AEM.1996.873081","DOIUrl":"https://doi.org/10.1109/AEM.1996.873081","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121029252","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}
Junction circulators in stripline and microstrip version are considered on the base of planar model analysis. The main steps of the proposed method includes: i) Replacing of the real structure of the coupling lines and disk resonator with its planar equivalents of the same height and characterized with effective dimensions and effective permittivity and permeability; ii) Assuming an approximate electrodynamical behaviour of the planar models the analysis of the investigated complicated microwave structures is done in closed-form and as a result of that the convenient expressions for the main junction parameters — Isolation and Return Losses are obtained; iii) Through a computer simulation an extensive information for the potential possibilities of the investigated junctions is easy obtained and in addition some new alternatives for the matching procedure are proposed. The planar model analysis is used for design of number stripline and microstrip circulators and isolators for communication and radar purposes.
{"title":"Planar model analysis of microwave ferrite junctions","authors":"S. Ivanov, P. Dankov","doi":"10.1109/AEM.1996.873145","DOIUrl":"https://doi.org/10.1109/AEM.1996.873145","url":null,"abstract":"Junction circulators in stripline and microstrip version are considered on the base of planar model analysis. The main steps of the proposed method includes: i) Replacing of the real structure of the coupling lines and disk resonator with its planar equivalents of the same height and characterized with effective dimensions and effective permittivity and permeability; ii) Assuming an approximate electrodynamical behaviour of the planar models the analysis of the investigated complicated microwave structures is done in closed-form and as a result of that the convenient expressions for the main junction parameters — Isolation and Return Losses are obtained; iii) Through a computer simulation an extensive information for the potential possibilities of the investigated junctions is easy obtained and in addition some new alternatives for the matching procedure are proposed. The planar model analysis is used for design of number stripline and microstrip circulators and isolators for communication and radar purposes.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124002174","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}
where f ( x ) represents the one-dimensional surface rougbness, a is the amplitude scaling fwtor, K is the fundamental surface wavenumber, b (Wl) is the frequency scaling parameter, cpn Is are specified phases, o is the rms height of the &add surface, C is a normalization f''aCt0r [1,2,3] and M is the number of surface tones. Note that the amplitude scaling factor a is related to the roughness fractal dimension Dr by [ l,2] :
{"title":"Scattering from multi - tone fractally corrugated or almost periodic conducting surfaces using the extended boundary condition method","authors":"S. Savaidis, P. Frangos, K. Hizanidis, D. Jaggard","doi":"10.1109/AEM.1996.873063","DOIUrl":"https://doi.org/10.1109/AEM.1996.873063","url":null,"abstract":"where f ( x ) represents the one-dimensional surface rougbness, a is the amplitude scaling fwtor, K is the fundamental surface wavenumber, b (Wl) is the frequency scaling parameter, cpn Is are specified phases, o is the rms height of the &add surface, C is a normalization f''aCt0r [1,2,3] and M is the number of surface tones. Note that the amplitude scaling factor a is related to the roughness fractal dimension Dr by [ l,2] :","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123181240","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}
G. Denisov, V. A. Flyagin, A. Kuftin, A. Pavelyev, V. Zapevalov
{"title":"Advanced russian gyrotrons for plasma investigations","authors":"G. Denisov, V. A. Flyagin, A. Kuftin, A. Pavelyev, V. Zapevalov","doi":"10.1109/AEM.1996.873192","DOIUrl":"https://doi.org/10.1109/AEM.1996.873192","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128303573","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}
H.V. Bagdassaryan, A. Daryan, T. Knyazyan, N. Uzunoglu
The investigation of electromagnetic wave penetration and reflection peculiarities fiom multilayer (periodic or nonperiodic) media are of great practical and theoretical interest. Till now extensively are considered only electromagnetic wave interaction with slabs whose permittivity don't depend on field intensity. But at present the theoretical solution of the problems of plane electromagnetic wave interaction with nonlinear slabs, i.e. with slabs in which occurs wave self-action is topical. Due to nonlinearity the wave process cannot be represented as superposition of counter-propagating traveling waves. Therefore we use a special form of solution of nonlinear wave equation in form of an indivisible expression, which completely describes the phase and amplitude distribution along the wave propagation direction Using this approach we investigated the interaction of plane electromagnetic wave with periodic structure. The observed structure consists of two adjacent slabs of two same thickness and different permittivities. This bilayer system can repeat two or more times. The nonlinearity was put into slabs by turns with low linear permittivity and vice versa. The consideration is carries out on the basis of exact equations solution by using numerical calculation methods. The received dependencies of reflectivity and transmittivity on the incident wave intensity show the bistable behaviour of these parameters. With increasing the number of bilayers at the same nonlinearity we observed the lessening of necessary value of incident wave intensity for bistable behaviour appearance. The used numerical calculation technique allows also to consider the absorption in slabs, the fact that makes this method of great practical and theoretical interest. PI.
{"title":"Plane electromagnetic wave selfraction in multilayer dielectric media","authors":"H.V. Bagdassaryan, A. Daryan, T. Knyazyan, N. Uzunoglu","doi":"10.1109/AEM.1996.873155","DOIUrl":"https://doi.org/10.1109/AEM.1996.873155","url":null,"abstract":"The investigation of electromagnetic wave penetration and reflection peculiarities fiom multilayer (periodic or nonperiodic) media are of great practical and theoretical interest. Till now extensively are considered only electromagnetic wave interaction with slabs whose permittivity don't depend on field intensity. But at present the theoretical solution of the problems of plane electromagnetic wave interaction with nonlinear slabs, i.e. with slabs in which occurs wave self-action is topical. Due to nonlinearity the wave process cannot be represented as superposition of counter-propagating traveling waves. Therefore we use a special form of solution of nonlinear wave equation in form of an indivisible expression, which completely describes the phase and amplitude distribution along the wave propagation direction Using this approach we investigated the interaction of plane electromagnetic wave with periodic structure. The observed structure consists of two adjacent slabs of two same thickness and different permittivities. This bilayer system can repeat two or more times. The nonlinearity was put into slabs by turns with low linear permittivity and vice versa. The consideration is carries out on the basis of exact equations solution by using numerical calculation methods. The received dependencies of reflectivity and transmittivity on the incident wave intensity show the bistable behaviour of these parameters. With increasing the number of bilayers at the same nonlinearity we observed the lessening of necessary value of incident wave intensity for bistable behaviour appearance. The used numerical calculation technique allows also to consider the absorption in slabs, the fact that makes this method of great practical and theoretical interest. PI.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114089274","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}
{"title":"GPIB in high speed data acquisition systems for remote sensing","authors":"S. Marinov","doi":"10.1109/AEM.1996.873178","DOIUrl":"https://doi.org/10.1109/AEM.1996.873178","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114305192","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}
Institute of Physics, St.Petersburg University, Ulyanovskaya 1, Petrodvorets, St.Petersburg, 198904, Russia Fax: (7) (812) -428-72-40 E-mail: boris4phim.niif.spb.su boris4snoopy.niif.spb.su In this report we present the explicit solutions of the inhomogeneous wave equation in the spacetime domain.The wavefunction is of one Cartesian component of electromagnetic field strength or the magnetic induction vectors (in special cases the description in terms of onecompone of the Hertzian vector can also be used) The source of some special form is distributed on a circle. The circle lies on the sphere surface, which begins its expansion with the velocity of light at fixed moment of time. The solution of the initial value problem is consructed in terms of transient modes in cylindrical coordinates by means of the incomplete separation of variables and the Riemann method [1,2]. Using the above solution we discuss the spacetime structure of above modes and two limiting cases: (i) the point source moving with velocity of light along the straight lines [3], and (ii) the source distributed on a circle, which is expanding with the velocity of light in the immobile plane. Notefthat the present results permit us to describe the electromagnetic wave produced by a pylse of hard radiation [ 4 , 5 1 . In particular, the above solutions are important in connection with the opportunity of traditional electromagnetic wave radiator construction.
{"title":"Transient waves produced by a source on the expanding circle","authors":"V. Borisov, I. Simonenko","doi":"10.1109/AEM.1996.872835","DOIUrl":"https://doi.org/10.1109/AEM.1996.872835","url":null,"abstract":"Institute of Physics, St.Petersburg University, Ulyanovskaya 1, Petrodvorets, St.Petersburg, 198904, Russia Fax: (7) (812) -428-72-40 E-mail: boris4phim.niif.spb.su boris4snoopy.niif.spb.su In this report we present the explicit solutions of the inhomogeneous wave equation in the spacetime domain.The wavefunction is of one Cartesian component of electromagnetic field strength or the magnetic induction vectors (in special cases the description in terms of onecompone of the Hertzian vector can also be used) The source of some special form is distributed on a circle. The circle lies on the sphere surface, which begins its expansion with the velocity of light at fixed moment of time. The solution of the initial value problem is consructed in terms of transient modes in cylindrical coordinates by means of the incomplete separation of variables and the Riemann method [1,2]. Using the above solution we discuss the spacetime structure of above modes and two limiting cases: (i) the point source moving with velocity of light along the straight lines [3], and (ii) the source distributed on a circle, which is expanding with the velocity of light in the immobile plane. Notefthat the present results permit us to describe the electromagnetic wave produced by a pylse of hard radiation [ 4 , 5 1 . In particular, the above solutions are important in connection with the opportunity of traditional electromagnetic wave radiator construction.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116564855","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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