Download or read book Electromagnetic Field Measurements of Very Short Radio Waves Near Their Source written by Richard Orin Cornett and published by . This book was released on 1936 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tour of the Electromagnetic Spectrum written by Ginger Butcher and published by Government Printing Office. This book was released on 2016 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Waves written by Mike Goldsmith and published by Oxford University Press, USA. This book was released on 2018 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: From sound waves to gravitational waves, and from waves of light to crashing rollers on the ocean, Mike Goldsmith explores the fundamental features shared by all waves in the natural world, and considers the range of phenomena resulting from wave motion, including reflection, diffraction, and polarization in light, and beats and echoes in sound.
Download or read book Propagation of Short Radio Waves written by Donald E. Kerr and published by IET. This book was released on 1987 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book treats the phenomena associated with the propagation of short radio waves between terminal points, whether they be the radar antenna serving a dual purpose or the antennas of a communications system. The intention is to present a summary of the state of knowledge in the microwave propagation field at the close of the war. There has been no attempt to produce either a handbook or textbook, but only an interim report on a rapidly changing subject. An attempt has been made to survey all relevant information that was available, from whatever source, and to summarise as much of it as was feasible.
Download or read book Measurements of Electromagnetic Fields in the Close Proximity of CB Antennas written by Paul S. Ruggera and published by . This book was released on 1979 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Human Exposure to Electromagnetic Fields written by Patrick Staebler and published by John Wiley & Sons. This book was released on 2017-05-12 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: Everyone, whether they like it or not, is exposed to electromagnetic fields, most of the time, at very low levels. In this case, they are inconsequential, but they can cause adverse health effects when they become intense enough. This topic is complex and sensitive. Covering frequencies from 0 Hz to 300 GHz, Human Exposure to Electromagnetic Fields provides an overview of this vast topic. After a reminder of the concepts of electromagnetic fields, the author presents some examples of sources of radiation in daily life and in the industrial or medical sectors. The biophysical and biological effects of these fields on the human body are detailed and the exposure limits are recalled. The exposure assessment and the implementation of the appropriate regulation within companies are also covered. Technically and practically, this book is aimed at people with a scientific background, risk prevention actors, health physicians, especially occupational doctors, and equipment designers.
Download or read book Electromagnetic Subsurface Imaging at VLF Using Distributed Optimization written by David Strauss and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of radio remote sensing is to learn more about the environment by observing how the environment interacts with radio waves. Radio remote sensing can be seen as three generic steps: measurement, processing, and interpretation. In this thesis, we discuss methods to address the latter components of radio remote sensing as they pertain to electromagnetic subsurface imaging. We describe a signal processing technique, known as sparse separation, that allows us to decompose the observed data into components that are of scientific value and those that are considered interference. We formulate electromagnetic subsurface imaging as an optimization problem constrained by a set of partial differential equations (PDEs), specifically Maxwell's equations, which govern electromagnetic wave propagation. Algorithms for approximating the solution to these optimization problems are presented and tested numerically. We image conductivities underground with natural sources of electromagnetic radio waves. In the VLF (Very Low Frequency, 3-30kHz) band there are many types of naturally occurring electromagnetic waves. We are primarily interested in a class of electromagnetic waves known as radio atmospherics, or sferics for short. Sferics are short-duration, broadband radio bursts produced by lightning discharges worldwide. Sferics provide three basic advantages for electromagnetic subsurface imaging. First sferics are plentiful; lightning occurs at a rate of 45 discharges per second. Second, because of the global distribution of lightning discharges, we are able to observe sferics incident from multiple different directions of arrival. Each independent incident direction provides more information about the subsurface conductivities. Third, sferics are broadband in nature. Each sferic contains information at multiple frequencies, further augmenting the information we have collected about the subsurface area of interest. The techniques developed in this thesis are designed to take advantage of these three basic properties. To better understand the data, we introduce and develop the technique of sparse separation in an overcomplete dictionary. By solving for a sparse, higher dimensional representation of our data we are able to partition the data into components that are scientifically valuable and components that are considered interference. We develop methods based on soft thresholding, the proximal operator for the sparsity promoting l1 bound. These first order methods scale well, thus permitting the processing of large datasets. Electromagnetic subsurface imaging is formulated as a nonlinear, non-convex, PDE-constrained optimization problem. Using the finite difference frequency domain (FDFD) method for modeling Maxwell's equations on a discrete grid, we can predict the electromagnetic fields everywhere within a computational domain for any wave illumination and any set of scattering conductivities underground. The goal of electromagnetic subsurface imaging is to find an optimal set of conductivities within our model of Maxwell's equations that predict electromagnetic fields that closely match a set of electromagnetic field observations. Many techniques exist for approximating the solution to non-convex optimization problems including sequential linear approximation, alternating projections, and semidefinite relaxations and embeddings. Adaptations of the alternating directions method of multipliers (ADMM) to this non-convex problem have shown the best performance for obtaining the best accuracy and incorporating the multiple frequency and multiple direction of arrival information from sferics in a distributed and scalable manner. Development of these algorithms leads to computational experiments to discover the real-world performance bounds. Adding more information to the problem increases estimation accuracy of subsurface conductivities. We investigate performance as a function of background conductivity and sensor noise. Varying these parameters allows us to predict the influence of basic physics principles and test the algorithms in a variety of possible real-world scenarios. Furthermore, we explore the relationship between the number of sensor measurements necessary and the accuracy we can obtain for determining the subsurface conductivity parameters. Numerical testing leads to a subsampling principle which gives a relationship between accuracy and the number of radio observations.
Download or read book University Physics written by Samuel J. Ling and published by . This book was released on 2017-12-19 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: University Physics is designed for the two- or three-semester calculus-based physics course. The text has been developed to meet the scope and sequence of most university physics courses and provides a foundation for a career in mathematics, science, or engineering. The book provides an important opportunity for students to learn the core concepts of physics and understand how those concepts apply to their lives and to the world around them. Due to the comprehensive nature of the material, we are offering the book in three volumes for flexibility and efficiency. Coverage and Scope Our University Physics textbook adheres to the scope and sequence of most two- and three-semester physics courses nationwide. We have worked to make physics interesting and accessible to students while maintaining the mathematical rigor inherent in the subject. With this objective in mind, the content of this textbook has been developed and arranged to provide a logical progression from fundamental to more advanced concepts, building upon what students have already learned and emphasizing connections between topics and between theory and applications. The goal of each section is to enable students not just to recognize concepts, but to work with them in ways that will be useful in later courses and future careers. The organization and pedagogical features were developed and vetted with feedback from science educators dedicated to the project. VOLUME II Unit 1: Thermodynamics Chapter 1: Temperature and Heat Chapter 2: The Kinetic Theory of Gases Chapter 3: The First Law of Thermodynamics Chapter 4: The Second Law of Thermodynamics Unit 2: Electricity and Magnetism Chapter 5: Electric Charges and Fields Chapter 6: Gauss's Law Chapter 7: Electric Potential Chapter 8: Capacitance Chapter 9: Current and Resistance Chapter 10: Direct-Current Circuits Chapter 11: Magnetic Forces and Fields Chapter 12: Sources of Magnetic Fields Chapter 13: Electromagnetic Induction Chapter 14: Inductance Chapter 15: Alternating-Current Circuits Chapter 16: Electromagnetic Waves
Download or read book Concise Encyclopedia of System Safety written by Clifton A. Ericson, II and published by John Wiley & Sons. This book was released on 2011-04-12 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive reference work covering safety professional terminology A convenient desk reference designed to fill a serious gap in the system safety body of knowledge, the Concise Encyclopedia of System Safety: Definition of Terms and Concepts is the first book explicitly devoted to defining system safety terms and concepts and designed to help safety professionals quickly and easily locate the definitions and information which they need to stay abreast of research new and old. Definitions for safety-related terminology currently differ between individual books, guidelines, standards, and even laws. Establishing a single common and complete set of definitions for the first time, with examples for each, the book revolutionizes the way in which safety professionals are able to understand their field. The definitive resource devoted to defining all of the major terms and concepts used in system safety and reliability in a single volume, Concise Encyclopedia of System Safety is the go-to book for systems safety engineers, analysts, and managers as they encounter new terms, or need an exact, technical definition of commonly used terms.
Download or read book Biological Effects of Radiofrequency Radiation written by Joe Allen Elder and published by . This book was released on 1984 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Oklahoma Academy of Science written by Oklahoma Academy of Science and published by . This book was released on 1937 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 1-49 are Proceedings of the 1st-57th annual meetings.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Essential Radio Astronomy written by James J. Condon and published by Princeton University Press. This book was released on 2016-04-05 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ideal text for a one-semester course in radio astronomy Essential Radio Astronomy is the only textbook on the subject specifically designed for a one-semester introductory course for advanced undergraduates or graduate students in astronomy and astrophysics. It starts from first principles in order to fill gaps in students' backgrounds, make teaching easier for professors who are not expert radio astronomers, and provide a useful reference to the essential equations used by practitioners. This unique textbook reflects the fact that students of multiwavelength astronomy typically can afford to spend only one semester studying the observational techniques particular to each wavelength band. Essential Radio Astronomy presents only the most crucial concepts—succinctly and accessibly. It covers the general principles behind radio telescopes, receivers, and digital backends without getting bogged down in engineering details. Emphasizing the physical processes in radio sources, the book's approach is shaped by the view that radio astrophysics owes more to thermodynamics than electromagnetism. Proven in the classroom and generously illustrated throughout, Essential Radio Astronomy is an invaluable resource for students and researchers alike. The only textbook specifically designed for a one-semester course in radio astronomy Starts from first principles Makes teaching easier for astronomy professors who are not expert radio astronomers Emphasizes the physical processes in radio sources Covers the principles behind radio telescopes and receivers Provides the essential equations and fundamental constants used by practitioners Supplementary website includes lecture notes, problem sets, exams, and links to interactive demonstrations An online illustration package is available to professors
Download or read book The Stars written by DK and published by Penguin. This book was released on 2016-10-11 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Expand your horizons and take in the awesome sights of the Universe. Using stunning space photography and easy-to-understand infographics, The Stars takes you to scores of galaxy clusters fantastically far away. Since the Big Bang 13.8 billion years ago, there are now hundreds of billions of stars, 200 billion alone in our home galaxy - the Milky Way. The Stars details 88 constellations to be found in the night sky, including Ursa Major, which contains the seven stars that make up the Plough, as well as Hercules, Lyra, Orion, and far away Andromeda. It explains how they came into being, where they are situated, and their key features. Feast your eyes on glowing galaxies, and rare sights such as dust clouds in the Carina and Ring Nebulae, taken by the Hubble Space Telescope. The Stars also provides an endless parade of mind-blowing facts such as when Betelgeuse explodes, it will release more energy in an instant that the Sun produces in its entire lifetime!
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Fundamentals of Lightning written by Vladimir A. Rakov and published by Cambridge University Press. This book was released on 2016-04-07 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the current state of the art in lightning science, for advanced undergraduate and graduate students on a single-semester course.
Download or read book Journal of Research written by United States. National Bureau of Standards and published by . This book was released on 1960 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt:
