Theory of Electromagnetic Generation of Acoustic Waves in Metals PDF Download
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Author:
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Category :
Languages : en
Pages : 83
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Author:
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ISBN:
Category :
Languages : en
Pages : 83
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Author: Kenneth Russell Lyall
Publisher:
ISBN:
Category : Electro-acoustics
Languages : en
Pages : 358
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Author: Martin R. Gaerttner
Publisher:
ISBN:
Category : Sound-waves
Languages : en
Pages : 332
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"A method of generating (and detecting) ultrasound in metals through purely electromagnetic means is investigated in this thesis. Radio frequency pulse echo techniques used for studying this process, called direct generation (or detection), are described. Measurements of the coupling efficiency of direct generation in a number of metals are reported for both the local and non local limits of electrical conductivity. Accurate measurements of the temperature, frequency, and magnetic field dependence have been made using frequencies between 3 and 100MHz. A free electron theory which assumes specular scattering of electrons at the surface has been proposed by others. This theory is extended in this thesis and quantitative comparisons with experimental measurements are presented. It has been found that, in the local limit of conductivity, experiment and theory are in good agreement for both transverse and longitudinal waves. In the non local limit, only transverse wave direct generation was considered. Discrepancies between experiment and theory were observed for the non local case with a magnetic field parallel to the direction of acoustic propagation. It is postulated that effects of diffuse scattering of electrons at the surface are responsible for some discrepancies. An interesting oscillatory magnetic field dependence of direct generation is reported for magnetic fields oriented perpendicular to the direction of acoustic propagation. The effect is demonstrated to result from forces associated with Gantmakher splashes. Although the coupling efficiency of direct electromagnetic generation is weak, it is demonstrated that signals can be obtained that are useful for non destructive testing. There are indications that non local direct generation becomes very efficient at microwave frequencies. Direct generation has also been observed in liquid metals."--Abstract.
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Author: Lyall, Kenneth Russell
Publisher: National Library of Canada
ISBN:
Category : Phonons
Languages : en
Pages : 358
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Author: Dale Everett Chimenti
Publisher:
ISBN:
Category : Hall effect
Languages : en
Pages : 264
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Author: Volkmar Kose
Publisher: IOS Press
ISBN: 9789051993813
Category : Science
Languages : en
Pages : 926
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The contents is dominated by the latest problems of applied electrical engineering, micro electromechanics, biosensor technology and biomagnetism. The book covers the numerical calculation methods for the design and optimization of sensors, actuators and electric machines, as well as the treatment of inverse problems, in materials testing and in the field of medicine in particular. Other central topics are the material properties and their simulation and much consideration is given to micro-electromechanics.
Author: R. Albanese
Publisher: IOS Press
ISBN: 9789051993752
Category : Medical
Languages : en
Pages : 362
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Europe's place in the world throughout the narrative and in the primary source feature, 'The Global Record.' The seventh edition has been carefully revised and edited for greater accessibility, and features a streamlined design that incorporates pedagogical features such as focus questions, key terms, and section summaries to better support students of western civilization. The reconceived narrative and restructured organization, featuring smaller, more cohesive learning units, lend to greater ease of use for both students and instructors. History CourseMate, a set of media-rich study tools with interactive eBook that gives students access to quizzes, flashcards, primary sources, videos and more, are available for this new edition. (CourseMate may be bundled with the text or purchased separately.) Available in the following split options: WESTERN CIVILIZATION: BEYOND BOUNDARIES, Seventh Edition Complete, Volume I: To 1715, Volume II: Since 1560, Volume A: To 1500, Volume B: 1300-1815, and Volume C: Since 1789. Available with InfoTrac Student Collections http://gocengage.com/infotrac.
Author: Warren P. Mason
Publisher: Elsevier
ISBN: 0323151272
Category : Science
Languages : en
Pages : 416
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Physical Acoustics: Principles and Methods, Volume X, is a five-chapter text that covers the principles and methods of generation of physical acoustics. The first chapter provides the essential results obtained concerning acoustic surface waves on curved surfaces and relates them to the corresponding plane surface waves. This chapter also presents a classification of surface and lateral waves on flat surfaces along with their properties. The second chapter describes a group of acoustic wave problems that are particularly suitable for study by means of Schlieren visualization. The third chapter deals with the production of ultrasonic waves by direct electromagnetic generation, while type II superconductors, which are useful for superconducting magnets with strong magnetic fields and with high current densities, are investigated in the fourth chapter. The fifth chapter discusses the principles of hologram and its application to very short length electromagnetic waves known as microwaves and to acoustic waves of various wavelengths.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 954
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Author:
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ISBN:
Category : Physics
Languages : en
Pages : 884
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