Electrodynamics in Moving Media

2019 ◽  
pp. 293-310
Author(s):  
Antonio Romano ◽  
Mario Mango Furnari
Keyword(s):  
Moving Media

scholarly journals Tutorial on seismic interferometry: Part 2 — Underlying theory and new advances

Geophysics ◽  
2010 ◽  
Vol 75 (5) ◽  
pp. 75A211-75A227 ◽  
Author(s):  
Kees Wapenaar ◽  
Evert Slob ◽  
Roel Snieder ◽  
Andrew Curtis
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Seismic Interferometry ◽  
Virtual Source ◽  
Bending Waves ◽  
Complex Source ◽  
Recent Developments ◽  
Diffusion Phenomena ◽  
Quantum Mechanical Scattering ◽  
Moving Media

In the 1990s, the method of time-reversed acoustics was developed. This method exploits the fact that the acoustic wave equation for a lossless medium is invariant for time reversal. When ultrasonic responses recorded by piezoelectric transducers are reversed in time and fed simultaneously as source signals to the transducers, they focus at the position of the original source, even when the medium is very complex. In seismic interferometry the time-reversed responses are not physically sent into the earth, but they are convolved with other measured responses. The effect is essentially the same: The time-reversed signals focus and create a virtual source which radiates waves into the medium that are subsequently recorded by receivers. A mathematical derivation, based on reciprocity theory, formalizes this principle: The crosscorrelation of responses at two receivers, integrated over differ-ent sources, gives the Green’s function emitted by a virtual source at the position of one of the receivers and observed by the other receiver. This Green’s function representation for seismic interferometry is based on the assumption that the medium is lossless and nonmoving. Recent developments, circumventing these assumptions, include interferometric representations for attenuating and/or moving media, as well as unified representations for waves and diffusion phenomena, bending waves, quantum mechanical scattering, potential fields, elastodynamic, electromagnetic, poroelastic, and electroseismic waves. Significant improvements in the quality of the retrieved Green’s functions have been obtained with interferometry by deconvolution. A trace-by-trace deconvolution process compensates for complex source functions and the attenuation of the medium. Interferometry by multidimensional deconvolution also compensates for the effects of one-sided and/or irregular illumination.

Neutron Transport in Moving Media

1979 ◽  
Vol 36 (2) ◽  
pp. 230-262 ◽  
Author(s):  
H. L. Wilson ◽  
W. H. Scott, Jr. ◽  
G C. Pomraning
Keyword(s):  
Neutron Transport ◽  
Moving Media

scholarly journals Relativistic Effects of Light in Moving Media with Extremely Low Group Velocity

2000 ◽  
Vol 84 (5) ◽  
pp. 822-825 ◽  
Author(s):  
U. Leonhardt ◽  
P. Piwnicki
Keyword(s):  
Group Velocity ◽  
Relativistic Effects ◽  
Moving Media

Polarization Relations and Dispersion Equations for Anisotropic Moving Media

1979 ◽  
Vol 34 (10) ◽  
pp. 1147-1157 ◽  
Author(s):  
Helmut Hebenstreit ◽  
Kurt Suchy
Keyword(s):  
Quadratic Forms ◽  
Bilinear Forms ◽  
Dispersion Equations ◽  
Left And Right ◽  
Moving Media ◽  
Eigenvectors And Eigenvalues

Abstract For media anisotropic (but not bi-anisotropic) in the comoving frame polarization relations and dispersion equations are derived using bilinear forms and quadratic forms, respectively. Specializations for media electrically anisotropic but magnetically isotropic (or vice versa) are given using (left and right) eigenvectors and eigenvalues of the material tensors.

Light drag in moving media with a high frequency dispersion

2006 ◽  
Vol 101 (5) ◽  
pp. 777-790 ◽  
Author(s):  
Yu. I. Heller
Keyword(s):  
High Frequency ◽  
Frequency Dispersion ◽  
Moving Media
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