Creeping Waves

Author: Matthew M. Bartlett
Editor:
ISBN: 9780997080315
File Size: 11,95 MB
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Where is the real Leeds? How does one get there? Is it floating on the air-words and music you can almost reach out and grab like wriggling worms of sound and ether? Is it in the carnival that seethes under the corrupted church, drawing the lost along shadowy corridors and through the strangely angled Funhouse doors to the place where the city fathers perform secret rites with the goat-headed masters of the dark? Do you seek the Real Leeds? Venture out to a secluded spot, turn on your radio, and spin that dial down to the murky low numbers, somewhere just around 87.9... That music, that voice calling on the edge of static and distortion-it might lead you to that blasted and damned path toward the Real and Truest heart of Leeds, Massachusetts. This is WXXT. It's the witching hour, when shadows take wing and nightmares stalk. Turn your radio up. Point your antennas to the infinite sky. And stay tuned for Weather on the Sixes. WXXT. The bubbling blisters on the tongue of the Pioneer Valley.

Creeping Waves And Lateral Waves In Acoustic Scattering By Large Elastic Cylinders

Author: George Vladimir Frisk
Editor:
ISBN:
File Size: 64,12 MB
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The connection between creeping wave and flat surface wave theory is established by investigating the limit of acoustic scattering from a solid elastic cylinder, imbedded in a fluid, whose radius tends to infinity. First, the asymptotic behavior of the complex circumferential wave numbers is calculated by substituting the appropriate Debye- or Airy-type asymptotic expansions into the 3 x 3 secular determinant and solving it using iterative techniques. It is found that, in the limit of infinite cylinder radius, the wave numbers of the Rayleigh and Stoneley modes tend toward those of the Rayleigh and Stoneley waves on a flat elastic half-space, while the Franz mode wave numbers tend toward the wave number of sound in the fluid. The longitudinal and transverse Whispering Gallery mode wave numbers tend toward the longitudinal and transverse wave numbers in the solid. Graphical results are presented for an aluminum cylinder in water (and in one case, also in vacuum) and show good agreement with existing numerical results. Then, using the Watson-Sommerfeld transformation, the limiting behavior of the solution to the problem of the scattering of a cylindrical wave from a cylinder whose radius tends to infinity is investigated. Using the analytic expressions for the creeping wave numbers, it is shown that the residue sums corresponding to the different classes of circumferential waves tend individually toward the different types of surface waves found on the flat surface.

Electromagnetic Wave Interactions

Author: Ard‚shir Guran
Editor: World Scientific
ISBN: 9789810226299
File Size: 29,57 MB
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This book is a collection of papers on electromagnetic wave mechanics and its applications written by experts in this field. It offers the reader a sampling of exciting research areas in this field. The topics include polarimetric imaging, radar spectroscopy, surface or creeping waves, bistatic radar scattering, the Seebeck affect. Mathematical methods include inverse scattering theory, singularity expansion method, mixed potential integral equation, method of moments, and diffraction theory. Applications include Cellular Mobile Radios (CMR), radar target identification, and Personal Communication Services (PCS). This book shows how electromagnetic wave theory is currently being utilized and investigated. It involves a modicom of mathematical physics and will be of interest to researchers and graduate students in electrical engineering, physics and applied mathematics.

Recueil Documentation Sur Arthur William Heintzelman

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ISBN:
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Welding Of Plastics

Author:
Editor: Woodhead Publishing
ISBN: 9781855735194
File Size: 57,52 MB
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Research reports carried out by TWI staff for The Welding Institute’s industrial members. Title includes: Structural integrity of butt fusion welded polyethylene pipes – a review; Ultrasonic and radiographic NDT of butt fusion welded polyethylene pipes; Assessment of ageing properties and residual stresses in thermoplastic welds.

Review Of Progress In Quantitative Nondestructive Evaluation

Author: Donald O. Thompson
Editor: Springer Science & Business Media
ISBN: 146151987X
File Size: 49,16 MB
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These Proceedings, consisting of Parts A and B, contain the edited versions of most of the papers presented at the annual Review of Progress in Quantitative Nondestructive Evaluation held at Snowmass Village, Colorado, on July 31 to August 4, 1994. The Review was organized by the Center for NDE at Iowa State University, in cooperation with the Ames Laboratory of the US DOE, the Materials Directorate of the Wright Laboratory, Wright-Patterson Air Force Base, the American Society of Nondestructive Testing, the Department of Energy, the National Institute of Standards and Technology, the Federal Aviation Administration, the National Science Foundation Industry/University Cooperative Research Centers, and the Working Group in Quantitative NDE. This year's Review of Progress in QNDE was attended by approximately 450 participants from the U.S. and many foreign countries who presented over 360 papers. The meeting was divided into 36 sessions, with as many as four sessions running concurrently. The Review covered all phases of NDE research and development from fundamental investigations to engineering applications or inspection systems, and it included many important methods of inspection science from acoustics to x-rays. In the last eight to ten years, the Review has stabilized at about its current size, which most participants seem to agree is large enough to permit a full-scale overview of the latest developments, but still small enough to retain the collegial atmosphere which has marked the Review since its inception.

Practical Applications Of Asymptotic Techniques In Electromagnetics

Author: Francisco Saez de Adana
Editor: Artech House
ISBN: 1608070646
File Size: 62,78 MB
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"Antenna, wireless communication and other electrical engineers use asymptotic techniques for solving electromagnetic problems when the electrical size of a given scenario is large in comparison to the wavelength. This practical book offers in-depth coverage of this area, showing how to apply these techniques to the analysis of complex electromagnetic problems in order to obtain results with an exceptionally high degree of accuracy. Focusing on two highly-effective methods - the uniform theory of diffraction (UTD) and physical optics (PO), this book is unique in that it emphasizes how to solve real-world problems, rather than simply explaining theory like other books on the market. This first-of-its-kind resource show professionals how to apply this knowledge to a wide range of projects in the field, including antenna design, mobile communications, and RCS (radar cross section) computation. This authoritative book is supported with more than 100 illustrations and over 250 equations."

Electromagnetic Wave Theory

Author: J. C. Brown
Editor: Elsevier
ISBN: 1483185923
File Size: 70,64 MB
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Electromagnetic Wave Theory, Part 2 contains the proceedings of a Symposium on Electromagnetic Wave Theory held at Delft, The Netherlands in September 1965. The symposium provided a forum for discussing electromagnetic wave theory and tackled a wide range of topics, from propagation in nonlinear media to electromagnetic wave propagation and amplification in solid-state plasmas. Electromagnetic waves in nonlinear transmission lines with active parameters are also considered, along with the phase dependence of maser active material Q-factor on pump intensity and frequency. Comprised of four sections, this volume begins with an analysis of two modes of propagation that are coupled through parametric modulation in nonlinear media. The discussion then turns to symmetry restrictions in nonlinear, non-absorbing, non-dispersive media; nonlinear interaction between two beams of plane electromagnetic waves in an anisotropic medium; radiation in periodically non-stationary media; and electromagnetic wave propagation in time-varying media. Subsequent chapters explore the diffraction of electromagnetic waves by plasma structures; resonant electromagnetic scattering from gyrotropic plasmas; scattering and transmission of electromagnetic waves at a statistically rough boundary between two dielectric media; and developments in wavefront reconstruction. This book will be useful for students, practitioners, and researchers in physics.

Mathematical And Numerical Aspects Of Wave Propagation Waves 2003

Author: Gary Cohen
Editor: Springer Science & Business Media
ISBN: 3642558569
File Size: 31,86 MB
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This volume includes articles on the mathematical modeling and numerical simulation of various wave phenomena. For many years Waves 2003 and its five prior conferences have been an important forum for discussions on wave propagation. The topic is equally important for fundamental sciences, engineering, mathematics and, in particular, for industrial applications. Areas of specific interest are acoustics, electromagnetics, elasticity and related inverse and optimization problems. This book gives an extensive overview of recent developments in a very active field of scientific computing.

Diffraction Of Creeping Waves

Author: N. Chr Albertsen
Editor:
ISBN:
File Size: 73,88 MB
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Pulsed Creeping Waves In Acoustics

Author: H. Uberall
Editor:
ISBN:
File Size: 30,53 MB
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The phenomenon of diffraction of acoustic and electromagnetic waves by finite or semi-finite obstacles has been interpreted, mainly following the classical paper by Franz, in terms of damped waves which, starting out at the boundary of the geometrical shadow, encircle the body any number of times ('creeping waves'). In acoustics, the sound velocity is small enough so that with sound pulses of sufficiently short duration, the individual creeping waves may be followed around the obstacle directly, whereas in the electromagnetic case, only steady-state interference effects can mainly be observed. The present work is a study of the diffraction of plane-wave sound pulses of arbitrary shape, including their geometrical reflection from the vertex, and their propagation on both the shadow and the insonified surface of the body, as well as their observation at large distances. The special example of an infinitely long, acoustically soft circular cylinder of not too small radius is used, but an extension to other simple cases is possible. (Author).

Geometrical Theory Of Diffraction

Author: V. A. Borovikov
Editor: IET
ISBN: 9780852968307
File Size: 35,26 MB
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This book details the ideas underlying geometrical theory of diffraction (GTD) along with its relationships with other EM theories.

Diffraction Of Creeping Waves

Author: N. C. Albertsen
Editor:
ISBN:
File Size: 61,82 MB
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Longitudinal Surface Acoustic Waves Creeping Waves

Author: Stanislovas Sajauskas
Editor:
ISBN: 9789955097778
File Size: 39,62 MB
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Pulse Shapes Of Creeping Waves Around Soft Cylinders

Author: H. Uberall
Editor:
ISBN:
File Size: 37,75 MB
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The process of diffraction of sound waves by finite obstacles is now commonly analyzed in terms of creeping waves that encircle the scattering object azimuthally. For the example of a soft infinite circular cylinder, we have studied the scattering of pulsed sound waves, both of delta-function and of finite step function shape (with or without harmonic modulation). We investigated the changes in pulse shape which occur as the pulse propagates over the cylinder surface. This constitutes an extension of previous work by Friedlander and by the present authors in which only the initial rise of the creeping pulses was obtained numerically, and it has been accomplished by an asymptotic expansion in the Laplace-transform variable s. (Author).

Diffraction Of Creeping Waves By An Edge

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ISBN:
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Determination Of Microscale Roughness Of Cylindrical Surfaces Using Ultrasonic Creeping Waves

Author: H. S. Hayre
Editor:
ISBN:
File Size: 54,60 MB
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The circumferential waves or creeping waves propagate in both media separated by a rough interface in an alternating fashion, and are reviewed from a theoretical point of view; the associated velocity of propagation dependence on the interface surface roughness is shown to be reasonably valid for microscale roughness determination. Experimental results are also included to support theory, and certain empirical relationships are derived as an example of the application of the technique. (Author).

Review Of Progress In Quantitative Nondestructive Evaluation

Author: Donald Thompson
Editor: Springer Science & Business Media
ISBN: 1468411942
File Size: 42,63 MB
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This Proceedings contains the edited papers presented at the annual Review of Progress in Quantitative NDE held at the University of California, Santa Cruz, Aug. 7-12, 1983. In it, papers have been arranged topically by chapters and subsections rather than by order of presentation at the Review. The editors believe that this format is preferable as a reference volume. Thus, the Proceedings contains nine chapters and subsections which provide broad coverage of topics of current interest in NDE research and development. The Review was sponsored by the Center for Advanced NDE, Ames Laboratory of the U. S. Department of Energy, in cooperation with the Office of Basic Energy Sciences, USDOE, the Defense Advanced Research Projects Agency, the Materials Laboratory of the Air Force Wright Aeronautical Laboratories, and the Naval Sea Systems Command. Approximately 275 attendees representing various government agencies, industry, and academia participated in the technical presentations, poster sessions, and discussions. This Review, possibly the most comprehensive annual symposium in NDE, emphasizes both basic research and early engineering applications; it provides a valuable forum for the transfer of technical information. Para graphs given below provide a brief summary of the contents of the Proceedings. Chapter 1 consists of four papers that discuss elements of NDE Reliability and contains the keynote paper given by Dr. J. M. Coffey of the NDT Applications Centre, Central Electricity Generating Board, Manchester, England. In his paper, Dr.

Electromagnetic Wave Propagation Radiation And Scattering

Author: Akira Ishimaru
Editor: John Wiley & Sons
ISBN: 1118098811
File Size: 76,99 MB
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One of the most methodical treatments of electromagnetic wave propagation, radiation, and scattering—including new applications and ideas Presented in two parts, this book takes an analytical approach on the subject and emphasizes new ideas and applications used today. Part one covers fundamentals of electromagnetic wave propagation, radiation, and scattering. It provides ample end-of-chapter problems and offers a 90-page solution manual to help readers check and comprehend their work. The second part of the book explores up-to-date applications of electromagnetic waves—including radiometry, geophysical remote sensing and imaging, and biomedical and signal processing applications. Written by a world renowned authority in the field of electromagnetic research, this new edition of Electromagnetic Wave Propagation, Radiation, and Scattering: From Fundamentals to Applications presents detailed applications with useful appendices, including mathematical formulas, Airy function, Abel’s equation, Hilbert transform, and Riemann surfaces. The book also features newly revised material that focuses on the following topics: Statistical wave theories—which have been extensively applied to topics such as geophysical remote sensing, bio-electromagnetics, bio-optics, and bio-ultrasound imaging Integration of several distinct yet related disciplines, such as statistical wave theories, communications, signal processing, and time reversal imaging New phenomena of multiple scattering, such as coherent scattering and memory effects Multiphysics applications that combine theories for different physical phenomena, such as seismic coda waves, stochastic wave theory, heat diffusion, and temperature rise in biological and other media Metamaterials and solitons in optical fibers, nonlinear phenomena, and porous media Primarily a textbook for graduate courses in electrical engineering, Electromagnetic Wave Propagation, Radiation, and Scattering is also ideal for graduate students in bioengineering, geophysics, ocean engineering, and geophysical remote sensing. The book is also a useful reference for engineers and scientists working in fields such as geophysical remote sensing, bio–medical engineering in optics and ultrasound, and new materials and integration with signal processing.