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1. |
Record Nr. |
UNINA9910299856003321 |
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Autore |
Schmerr Jr Lester W |
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Titolo |
Fundamentals of Ultrasonic Phased Arrays / / by Lester W. Schmerr Jr |
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Pubbl/distr/stampa |
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Cham : , : Springer International Publishing : , : Imprint : Springer, , 2015 |
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ISBN |
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Edizione |
[1st ed. 2015.] |
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Descrizione fisica |
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1 online resource (382 p.) |
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Collana |
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Solid Mechanics and Its Applications, , 0925-0042 ; ; 215 |
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Disciplina |
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Soggetti |
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Materials science |
Vibration |
Dynamics |
Acoustics |
Radiology |
Applied mathematics |
Engineering mathematics |
Characterization and Evaluation of Materials |
Vibration, Dynamical Systems, Control |
Ultrasound |
Mathematical and Computational Engineering |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Description based upon print version of record. |
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Nota di bibliografia |
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Includes bibliographical references at the end of each chapters and index. |
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Nota di contenuto |
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From the Contents: Introduction -- Acoustic Field of a 1-D Array Element -- Large, Single Element Transducer Models -- Phased Array Beam Modeling (1-D Elements) -- Time Delay Laws (2-D) -- Acoustic Field of a 2-D Array Element -- Phased Array Beam Modeling (2-D Elements) -- Time Delay Laws (3-D) -- Linear System Models of Phased Arrays -- Phased Array System Functions -- Measurement Models for Ultrasonic Arrays -- Imaging with Phased Arrays - An Introduction -- Imaging Measurement Models -- Element Boundary Conditions and Other Modeling Issues -- Appendix A - The Beylkin Determinant -- Appendix B - Angle Area Ratios -- Appendix C - MATLAB® Functions and Scripts -- Index. |
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Sommario/riassunto |
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This book describes in detail the physical and mathematical foundations of ultrasonic phased array measurements. The book uses linear systems theory to develop a comprehensive model of the signals and images that can be formed with phased arrays. Engineers working in the field of ultrasonic nondestructive evaluation (NDE) will find in this approach a wealth of information on how to design, optimize and interpret ultrasonic inspections with phased arrays. The fundamentals and models described in the book will also be of significant interest to other fields, including the medical ultrasound and seismology communities. A unique feature of this book is that it presents a unified theory of imaging with phased arrays that shows how common imaging methods such as the synthetic aperture focusing technique (SAFT), the total focusing method (TFM), and the physical optics far field inverse scattering (POFFIS) imaging method are all simplified versions of more fundamental and quantitative imaging approaches, called imaging measurement models. To enhance learning, this book first describes the fundamentals of phased array systems using 2-D models, so that the complex 3-D cases normally found in practice can be more easily understood. In addition to giving a detailed discussion of phased array systems, Fundamentals of Ultrasonic Phased Arrays also provides MATLAB® functions and scripts, allowing the reader to conduct simulations of ultrasonic phased array transducers and phased array systems with the latest modeling technology. |
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2. |
Record Nr. |
UNINA9910954754603321 |
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Autore |
Baer Hill Josette |
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Titolo |
Alexander Dubček Unknown (1921–1992) : The Life of a Slovak Hero / / Josette Baer Hill, Stanislav Sikora |
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Pubbl/distr/stampa |
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ISBN |
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Edizione |
[1st ed.] |
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Descrizione fisica |
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1 online resource (299 pages) : illustrations |
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Disciplina |
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Soggetti |
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Biografie |
Politik |
Tschecheslowakei |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di bibliografia |
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Includes bibliographical references (pages 253-271) and index. |
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Sommario/riassunto |
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Alexander Dubček is well-known, so one might think; nothing new can be written about him. Is this true? Dubček is the symbol of the Czechoslovak attempt to reform communism that gained worldwide admiration in 1968. The invasion of Warsaw Pact troops in the night of August 21, 1968 set a brutal end to the Prague Spring. Josette Baer’s new biography focuses on Dubček’s early years, his childhood in Soviet Kirghizia, his participation in the Slovak National Uprising in 1944 against Nazi Germany and the Slovak clerical-fascist government, and his career in the Slovak Communist Party in the late 1950s and early 1960s. It offers new insights into the political thought of the father of ‘Socialism with a Human Face’, based on archive material available to the Western reader for the first time. Who was Alexander Dubček—a naïve apparatchik, an independent thinker, a courageous liberator, or a political dreamer? |
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