Surface wave character on slabs with negative electrical permittivity or negative magnetic permeability

Evolutionary topology optimization of periodic composites for extremal magnetic permeability and electrical permittivity

Structural and Multidisciplinary Optimization ◽

10.1007/s00158-012-0766-8 ◽

2012 ◽

Vol 46 (3) ◽

pp. 385-398 ◽

Cited By ~ 58

Author(s):

X. Huang ◽

Y. M. Xie ◽

B. Jia ◽

Q. Li ◽

S. W. Zhou

Keyword(s):

Topology Optimization ◽

Magnetic Permeability ◽

Periodic Composites ◽

Electrical Permittivity

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Introductory Chapter: Causal Models of Electrical Permittivity and Magnetic Permeability

Electromagnetic Field Radiation in Matter ◽

10.5772/intechopen.92313 ◽

2020 ◽

Author(s):

Walter Gustavo Fano

Keyword(s):

Magnetic Permeability ◽

Causal Models ◽

Electrical Permittivity

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MATCHED FILTER DETECTION OF ELECTROMAGNETIC TRANSIENT REFLECTIONS

Geophysics ◽

10.1190/1.1440457 ◽

1974 ◽

Vol 39 (5) ◽

pp. 683-691 ◽

Cited By ~ 3

Author(s):

C. S. Clay ◽

L. L. Greischar ◽

T. K. Kan

Keyword(s):

Surface Wave ◽

Magnetic Permeability ◽

Matched Filter ◽

Numerical Models ◽

Transient Signal ◽

Matched Filters ◽

Electromagnetic Transient ◽

Different Depths ◽

Aluminum Plates ◽

Laboratory Models

An electromagnetic transient signal is distorted as it travels in the conducting earth. At vertical incidence, the signal is stretched by a time that is proportional to the magnetic permeability, conductivity, and depth squared. The stretch is a function of the travel distance, and a set of filters can be constructed to match the waveforms of signals which have traveled to different depths. Surface waves travel from the source and can overlap the reflected signals. The reflected signals were estimated by subtracting an estimate of the surface wave and then passing the estimated reflections through a set of matched filters. This method was tested by means of numerical models and laboratory models. The latter were coaxial coils on aluminum plates. In both cases, the matched filters determined the depth of the reflected signals.

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Exit-surface wave reconstruction using a focal series

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100129577 ◽

1992 ◽

Vol 50 (2) ◽

pp. 988-989

Author(s):

W.J. de Ruijter ◽

M.R. McCartney ◽

David J. Smith ◽

J.K. Weiss

Keyword(s):

Surface Wave ◽

Spherical Aberration ◽

Data Extraction ◽

High Sensitivity ◽

Geometric Distortion ◽

Variation Method ◽

Objective Lens ◽

Immediate Reconstruction ◽

Exit Surface ◽

Electron Microscopes

Further advances in resolution enhancement of transmission electron microscopes can be expected from digital processing of image data recorded with slow-scan CCD cameras. Image recording with these new cameras is essential because of their high sensitivity, extreme linearity and negligible geometric distortion. Furthermore, digital image acquisition allows for on-line processing which yields virtually immediate reconstruction results. At present, the most promising techniques for exit-surface wave reconstruction are electron holography and the recently proposed focal variation method. The latter method is based on image processing applied to a series of images recorded at equally spaced defocus.Exit-surface wave reconstruction using the focal variation method as proposed by Van Dyck and Op de Beeck proceeds in two stages. First, the complex image wave is retrieved by data extraction from a parabola situated in three-dimensional Fourier space. Then the objective lens spherical aberration, astigmatism and defocus are corrected by simply dividing the image wave by the wave aberration function calculated with the appropriate objective lens aberration coefficients which yields the exit-surface wave.

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