Bøger udgivet af SciTech Publishing Inc

The long awaited revision of the classic book Transmission Line Transformers, by Jerry Sevick, is now in its fifth edition and has been updated and reorganised by Raymond Mack to provide communication engineers with a clear technical presentation of both the theory and practical applications of the transmission of radio communication.Sevick's Transmission Line Transformers: Theory and Practice, 5th Edition reviews the underlying principles that promote a better understanding of transmission line transformers. Ideal for academics and practicing engineers, this edition is divided into two clear parts for easy reference. Part one is a review of the theory and new concepts, including a discussion on the magnetic properties that affect the core of a transmission line transformer. Part two essentially focuses on the 'practice' element of the book title. This section has been updated to reflect the significant changes in component suppliers over the 30 years since the first edition of the book.Highlights of this title include the coverage of substantial background theory, recent work on fractional ratio transformers and high power Balun designs, and provides updated sources for transformer materials to reflect mergers, sales, and business failures over the past 20 years. There is also expanded coverage of commercial sources of low impedance coaxial cable; expanded construction hints for purpose built rectangular parallel transmission lines; plus an updated test equipment chapter to reflect modern computer based experimenter grade test equipment sources. Ray has leveraged his experience with ferrite materials for switching power to explain the performance characteristics of the ferrite materials used for RF power transmission line transformers.

This book combines theory with practical applications for the analysis and design of a wide variety of antenna configurations simulated on FEKO, the leading real-world commercial software programme.

Practical Communication Theory, 2nd Edition enables the reader to quickly and easily generate the answers to real-world problems encountered in specifying, testing, and fielding any type of systems that involve radio propagation. It deals with free space radio propagation and propagation near the ground and over the ridge lines. As a bonus, this book also includes a special antenna and propagation slide rule, with unique scales, along with detailed explanations, and examples, of how to use it.Now in its second edition, Practical Communication has been updated to include new material on radio propagation near the earth in communication bands, which also explains how to use the slide rule scales for each of the appropriate propagation modes. The section on dynamic range has been expanded and there is additional material on knife-edge diffraction. The appendices have also been updated to include extra propagation formulae and graphs.

This book introduces the powerful Finite-Difference Time-Domain method to students and interested researchers and readers. An effective introduction is accomplished using a step-by-step process that builds competence and confidence in developing complete working codes for the design and analysis of various antennas and microwave devices. This book will serve graduate students, researchers, and those in industry and government who are using other electromagnetics tools and methods for the sake of performing independent numerical confirmation. No previous experience with finite-difference methods is assumed of readers.Key featuresPresents the fundamental techniques of the FDTD method at a graduate level, taking readers from conceptual understanding to actual program development.Full derivations are provided for final equations.Includes 3D illustrations to aid in visualization of field components and fully functional MATLAB® code examples.Completely revised and updated for this second edition, including expansion into advanced techniques such as total field/scattered field formulation, dispersive material modeling, analysis of periodic structures, non-uniform grid, and graphics processing unit acceleration of finite-difference time-domain method.

Greatly expanded from the best-selling second edition by George W.Stimson, this book offers a complete overview of the major developments in air and spaceborne radar in line with advances in modern technology.

Principles of Modern Radar: Basic Principles is a comprehensive and modern textbook for courses in radar systems and technology at the college senior and graduate student level; a professional training textbook for formal in-house courses for new hires; a reference for ongoing study following a radar short course; and a self-study and professional reference book.Principles of Modern Radar focuses on four key areas:Basic concepts, such as the the radar range equation and threshold detectionRadar signal phenomenology, such as radar cross section models, clutter, atmospheric effects, and Doppler effectsDescriptions of all major subsystems of modern radars, such as the antenna, transmitter, receiver, including modern architectural elements such as exciters, and advanced signal processorsSignal and data processing basics, from digital signal processing (DSP) fundamentals, through detection, Doppler processing, waveforms and pulse compression, basic imaging concepts, and tracking fundamentals.While several established books address introductory radar systems, Principles of Modern Radar differs from these in its breadth of coverage, its emphasis on current methods (without losing sight of bedrock principles), and its adoption of an appropriate level of quantitative rigor for the intended audience of students and new professional hires.The manuscript for this book was reviewed by over 50 professionals in academia, military, and commercial enterprises. These reviewers were among thousands of potential users approached by the publisher and asked to share their expertise and experience in radar training and instruction. Their extensive comments, corrections, and insights ensure that Principles of Modern Radar will meet the needs of modern radar educators and students around the world. Written and edited by world-renowned radar instructors and critically reviewed by users before publication, this is truly a radar community-driven book.

Do you believe that the pesticide DDT is responsible for the near destruction of many species of birds? Do you think that our air and water are dirtier now than ever before? Are you worried about global warming? Do you believe that nature is so frail as to be on the verge of collapse due to human interventions? This book challenges current environmental doctrine and beliefs that have broad consensus in the American psyche. The challenges are based in the research of scientists worldwide and published within hundreds of books and thousands of articles which have not received the attention they deserve from American media. For example, research has shown that DDT was not responsible for egg-shell thinning, nor was it the poison environmental activists purported it to be. Our air and water are cleaner today than it has been in the last half-century, did you know? The actual rise in temperature over the last century has been less than one degree Fahrenheit, so is global warming really an issue that we should spend billions on? Research also showed that the beaches in Prince William Sound that were not cleaned after the Exxon Valdez disaster were in better shape 7 years later than those that were cleaned. Thirty two chapters on issues from chemicals to radiation risk, as well as a section on the culture of the environment might just change your mind on several issues. It will give you what you have been lacking for decades...the other side of the story.

This updated edition of the industry's classic text combines the theory, practice, and latest technology of spectrum and network measurements in electronic systems to offer a comprehensive and easy way to understand frequency domain measurements.