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Autor: Ramdani, Karim (Comienzo)
2 registros cumplieron la condición especificada en la base de información BIBCYT. ()
Registro 1 de 2, Base de información BIBCYT
Publicación seriada
Referencias AnalíticasReferencias Analíticas
Autor: Bonnet-Ben Dhia, Anne-Sophie ; Ramdani, Karim
Título: Mathematical Analysis of Conducting and Superconducting Transmission Lines
Páginas/Colación: pp. 2087-2113
Url: Ir a http://siamdl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=SMJMAP000060000006002087000001&idtype=cvips&gifs=Yeshttp://siamdl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=SMJMAP000060000006002087000001&idtype=cvips&gifs=Yes
SIAM Journal on Applied Mathematics Vol. 60, no. 6 May/June 2000
Información de existenciaInformación de existencia

Palabras Claves: Palabras: MAXWELL'S EQUATIONS MAXWELL'S EQUATIONS, Palabras: SPECTRAL ANALYSIS SPECTRAL ANALYSIS, Palabras: SUPERCONDUCTING TRANSMISSION LINES SUPERCONDUCTING TRANSMISSION LINES, Palabras: WAVEGUIDES WAVEGUIDES

Resumen
RESUMEN

RESUMEN

 

This paper is concerned with a mathematical study of guided propagation in the microstrip transmission lines used in microelectronics.

 

In the first part, the case of a zero-thickness perfectly conducting strip is considered. Using a regularized formulation of Maxwell's equations, it is shown that finding guided modes amounts to the spectral analysis of a noncompact family of self-adjoint operators. The existence of guided modes is then proved thanks to the min-max principle.

 

In the second part, we deal with the case of a zero-thickness superconducting strip. An asymptotic model derived from London's equation is studied and the existence of guided modes is deduced from the case of the perfectly conducting strip.

 

Registro 2 de 2, Base de información BIBCYT
Publicación seriada
Referencias AnalíticasReferencias Analíticas
Autor: HAZARD, CHRISTOPHE ; Ramdani, Karim
Título: Selective Acoustic Focusing Using Time-Harmonic Reversal Mirrors
Páginas/Colación: pp. 1057-1076
Url: Ir a http://epubs.siam.org/sam-bin/dbq/article/42873http://epubs.siam.org/sam-bin/dbq/article/42873
SIAM Journal on Applied Mathematics Vol. 64, no. 3 March/April 2004
Información de existenciaInformación de existencia

Resumen
A mathematical study of the focusing properties of acoustic fields obtained by a time-reversal process is presented. The case of time-harmonic waves propagating in a nondissipative medium containing sound-soft obstacles is considered. In this context, the so-called D.O.R.T. method (decomposition of the time-reversal operator in French) was recently proposed to achieve selective focusing by computing the eigenelements of the time-reversal operator. The present paper describes a justification of this technique in the framework of the far field model, i.e., for an ideal time-reversal mirror able to reverse the far field of a scattered wave. Both cases of closed and open mirrors, that is, surrounding completely or partially the scatterers, are dealt with. Selective focusing properties are established by an asymptotic analysis for small and distant obstacles. Key words. acoustic scattering, time-reversal, far field operator, small obstacles

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

UCLA - Biblioteca de Ciencias y Tecnologia Felix Morales Bueno

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