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Author : L.B. Felsen
Publisher : Springer
Page : 274 pages
File Size : 55,5 Mb
Release : 2014-03-12
Category : Science
ISBN : 3662309068
Author : L.B. Felsen
Publisher : Springer Science & Business Media
Page : 289 pages
File Size : 46,6 Mb
Release : 2006-01-21
Category : Science
ISBN : 9783540380955
Author : Hans J. Schmitt
Publisher : Unknown
Page : 44 pages
File Size : 47,7 Mb
Release : 1963
Category : Antennas (Electronics)
ISBN : UOM:39015095136498
The receiving and transmitting properties of small linear antennas, conical antennas, and loops for transient electromagnetic fields were investigated experimentally. Short electrical dipoles loaded by a capacitance represented by a cathode follower can be used successfully for the measurement of transient fields with rise times of less than 1 nanosecond, if the first antenna resonance is suppressed by a series resistor at the base of the antenna. The currents induced on nonresonant structures by transient electromagnetic fields are investigated and their application to a direct measurement of the time sequence of the electromagnetic field is discussed. Signals with a simple and known time dependence such as a unidirectional pulse can be radiated into space if the reflection of current waves at discontinuities of the antenna structure is avoided. In a manner similar to that useful for the absorption of continuous waves in media with a stratified conductivity, it is shown that reflections at discontinuities can be avoided by dipoles with tapered resistive loading. (Author).
Author : Charles W. Harrison
Publisher : Unknown
Page : 44 pages
File Size : 44,9 Mb
Release : 1964
Category : Antennas (Electronics)
ISBN : UOM:39015095136597
Author : Anonim
Publisher : Unknown
Page : 128 pages
File Size : 52,6 Mb
Release : 1964
Category : Electronic
ISBN : OCLC:958277443
Author : Charles W. Harrison
Publisher : Unknown
Page : 20 pages
File Size : 52,7 Mb
Release : 1964
Category : Antennas (Electronics)
ISBN : UOM:39015095136589
Author : Alexander A. Kaufman,George Vernon Keller
Publisher : Elsevier Publishing Company
Page : 716 pages
File Size : 46,5 Mb
Release : 1983
Category : Electromagnetic fields
ISBN : UCAL:B4118514
Author : Xiu Li,Guoqiang Xue,Changchun Yin
Publisher : Springer
Page : 139 pages
File Size : 44,7 Mb
Release : 2016-10-15
Category : Science
ISBN : 9789811027086
This book is based on more than a decade of research the authors have pursued on the pseudo-seismic migration imaging of the transient electromagnetic method, and provides a series of important findings on the theory and applications in this area. It present and analyzes transforming principles, TEM wave field methods, characteristics of the TEM virtual wave field and studies on many significant related technologies. The coverage is supplemented by a wealth of 1-D, 2-D and 3-D figures to illustrate pseudo-seismic theory. The book offers a valuable resource for teachers, students, researchers and engineers in the fields of geophysics, earth exploration and information technology.
Author : Neil R. Sheeley, Jr.
Publisher : Springer Nature
Page : 231 pages
File Size : 41,8 Mb
Release : 2020-03-23
Category : Science
ISBN : 9783030402648
This book is an original study aimed at understanding how vacuum magnetic fields change with time. Specifically, it describes the waves that radiate from a sphere when the electric current on its surface is turned on or off, either suddenly, gradually, or periodically. Numerical simulations are an invaluable source of information about this and related subjects, but they are often more difficult to interpret than exact, closed-form solutions that can easily be applied to a variety of situations. Thus, the objective here is to obtain an exact solution of Maxwell’s equations in closed form—something simple, yet rigorous, which can be used as a model for understanding transient magnetic fields in more complicated situations. The work therefore stands as a self-contained solution of Maxwell’s equations for an electric current wrapped around the surface of a sphere. This study assumes a strong background in electromagnetism or a related research area. Online animations are available for each figure to better illustrate the motions of magnetic field lines.
Author : Yunze He,Bin Gao,Ali Sophian,Ruizhen Yang
Publisher : Butterworth-Heinemann
Page : 374 pages
File Size : 42,8 Mb
Release : 2017-05-25
Category : Technology & Engineering
ISBN : 9780128128367
Transient Electromagnetic-Thermal Nondestructive Testing: Pulsed Eddy Current and Transient Eddy Current Thermography covers three key areas of theories, methods and applications, primarily the multi-physics field, including eddy current, heat conduction and Infrared radiation for defect evaluation, lateral heat conduction, which is analyzed to detect parallel cracks, and longitudinal heat conduction, which is analyzed to detect depth defect, or that which is beyond skin depth. In addition, the book explores methods, such as time domain, frequency domain and logarithm domain, also comparing A-scan , B-scan and C-scan. Sections on defect identification, classification and quantification are covered, as are advanced algorithms, principal components analysis (PCA), independent components analysis (ICA) and support vector machine (SVM). The book uses a lot of experimental studies on multi-layer aluminum structures, honeycomb structure, CFRP in the aerospace field, and steel and coating in the marine rail and transportation fields. Presents two kinds of transient NDT testing, from theory and methodology, to applications Includes time domain frequency domain and logarithm domain, which are all analyzed Introduces A-scan , B-scan and C-scan, which are compared Provides experimental studies for real damages, including corrosion and blister in steel, stress in aluminum, impact and delamination in CFRP laminates and RCF cracks are abundant
Author : Dragan Poljak,Mario Cvetkovic
Publisher : Academic Press
Page : 280 pages
File Size : 54,8 Mb
Release : 2019-06-07
Category : Science
ISBN : 9780128166246
Human Interaction with Electromagnetic Fields: Computational Models in Dosimetry presents some highly rigorous and sophisticated integral equation techniques from computational electromagnetics (CEM), along with practical techniques for the calculation and measurement of internal dosimetry. Theory is accompanied by numerical modeling algorithms and illustrative computational examples that range from academic to full real-world scenarios. Covers both deterministic and stochastic modeling Presents implementations of integral equation approaches, overcoming the limitations of the FDTD approach Presents various biomedical applications
Author : A. Savini,J. Turowski
Publisher : Springer Science & Business Media
Page : 306 pages
File Size : 55,5 Mb
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 9781461307211
This book is the collection of the contributions offered at the International Symposium on Electromagnetic Fields in Electrical Engineering, ISEF '87, held in Pavia, Italy, in September 1987. The Symposium was attended by specialists engaged in both theoretical and applied research in low-frequency electromagnetism. The charming atmosphere of Pavia and its ancient university provided a very effective environment to discuss the latest results in the field and, at the same time, to enjoy the company or colleagues and friends coming from over 15 countries. The contributions have been grouped into 7 chapters devoted to fundamental problems, computer programs, transformers, rotating electrical machines, mechanical and thermal effects, various applications and synthesis, respectively. Such a classification is merely to help the reader because a few papers could be put in several chapters. Over the past two decades electromagnetic field computations have received a big impulse by the large availability of digital computers with better and better performances in speed and capacity. Many various methods have been developed but not all of them appear convenient enough for practical engineering use. In fact, the technical and industrial challenges set some principal attributes and criteria for good computation methods. They should be relatively easy to use, fit into moderately sized computers, yield useful design data, maintain flexibility with m1n1mum cost in time and effort.
Author : Chalmers M. Butler
Publisher : Unknown
Page : 250 pages
File Size : 46,9 Mb
Release : 1962
Category : Electromagnetism
ISBN : WISC:89011053717
Author : Jean G. Van Bladel
Publisher : John Wiley & Sons
Page : 1171 pages
File Size : 40,7 Mb
Release : 2007-05-23
Category : Science
ISBN : 9780470124574
Professor Jean Van Bladel, an eminent researcher and educator in fundamental electromagnetic theory and its application in electrical engineering, has updated and expanded his definitive text and reference on electromagnetic fields to twice its original content. This new edition incorporates the latest methods, theory, formulations, and applications that relate to today's technologies. With an emphasis on basic principles and a focus on electromagnetic formulation and analysis, Electromagnetic Fields, Second Edition includes detailed discussions of electrostatic fields, potential theory, propagation in waveguides and unbounded space, scattering by obstacles, penetration through apertures, and field behavior at high and low frequencies.
Author : Jian-Ming Jin
Publisher : John Wiley & Sons
Page : 744 pages
File Size : 44,6 Mb
Release : 2015-08-26
Category : Science
ISBN : 9781119108092
Reviews the fundamental concepts behind the theory and computation of electromagnetic fields The book is divided in two parts. The first part covers both fundamental theories (such as vector analysis, Maxwell’s equations, boundary condition, and transmission line theory) and advanced topics (such as wave transformation, addition theorems, and fields in layered media) in order to benefit students at all levels. The second part of the book covers the major computational methods for numerical analysis of electromagnetic fields for engineering applications. These methods include the three fundamental approaches for numerical analysis of electromagnetic fields: the finite difference method (the finite difference time-domain method in particular), the finite element method, and the integral equation-based moment method. The second part also examines fast algorithms for solving integral equations and hybrid techniques that combine different numerical methods to seek more efficient solutions of complicated electromagnetic problems. Theory and Computation of Electromagnetic Fields, Second Edition: Provides the foundation necessary for graduate students to learn and understand more advanced topics Discusses electromagnetic analysis in rectangular, cylindrical and spherical coordinates Covers computational electromagnetics in both frequency and time domains Includes new and updated homework problems and examples Theory and Computation of Electromagnetic Fields, Second Edition is written for advanced undergraduate and graduate level electrical engineering students. This book can also be used as a reference for professional engineers interested in learning about analysis and computation skills.
