Pulse and Synchro-Photon Electronics


Book Description

This book presents the theory of large-signal nonlinear impulse processes occurring in bipolar and field-effect transistors with a Schottky gate, collapse TRAPATT and tunnel diodes, superlattices, and double heterojunction lasers. It evaluates the maximum speed of impulse operation of these elements and experimentally constructs the generation of pulse oscillations with a repetition frequency of up to 1, 2 and 4 GHz. Original or adapted methods of mathematical modeling of processes provide an opportunity to obtain quantitative dependencies of generated pulse parameters, while the book also details the synchro-photon effect. In addition, as shown here, when a semiconductor element is switched on by an electric pulse, and at the same time a pulse of photons synchronously illuminates it, an effect occurs which increases the switching speed of the element by an order of magnitude. At the same time, the switching transient characteristic is shortened by 10 times or more. After applying this effect in pulse generators in the gigahertz frequency range, an increase in the repetition frequency of the generated oscillations is possible.




Pulse Width Modulation In Power Electronics


Book Description

This book provides a theoretical discussion of pulse width modulation (PWM) in power electronic inverters. Pulse width modulation is widely used for the frequency control of speed of ac motors, the design of uninterruptible power supplies (UPS) as well as the integration of renewable energy sources into existing power grid systems. PWM technique is based on approximation of sinusoidal waveforms by sequences (trains) of rectangular pulses whose widths are properly modulated. This width-modulation results in the suppression of low order harmonics at the expense of amplification of high order harmonics which are suppressed by energy-storage elements in load circuits. The discussion covers various PWM techniques with a focus on the optimal time-domain PWM techniques proposed by the authors.




Transient Electronics


Book Description

Passive Pulse Generators are circuits used to generate very high power electrical pulses. Such pulses find application in a wide range of disciplines, including plasma generation, gas laser physics and radar. * Includes two introductory chapters on techniques used to analyse passive pulse generators * Includes worked examples A valuable reference resource for specialist undergraduates, post graduate students and researchers active in the field og pulsed power and areas where pulsed power is applied, including physicists, engineers and those with an interest in waste and materials processing.




Advanced Pulse-Width-Modulation: With Freedom to Optimize Power Electronics Converters


Book Description

This book is a technical publication for students, scholars and engineers in electrical engineering, focusing on the pulse-width-modulation (PWM) technologies in power electronics area. Based on an introduction of basic PWM principles this book analyzes three major challenges for PWM on system performance: power losses, voltage/current ripple and electromagnetic interference (EMI) noise, and the lack of utilization of control freedoms in conventional PWM technologies. Then, the model of PWM's impact on system performance is introduced, with the current ripple prediction method for voltage source converter as example. With the prediction model, two major advanced PWM methods are introduced: variable switching frequency PWM and phase-shift PWM, which can reduce the power losses and EMI for the system based on the prediction model. Furthermore, the advanced PWM can be applied in advanced topologies including multilevel converters and paralleled converters. With more control variables in the advanced topologies, performance of PWM can be further improved. Also, for the special problem for common-mode noise, this book introduces modified PWM method for reduction. Especially, the paralleled inverters with advanced PWM can achieve good performance for the common-mode noise reduction. Finally, the implementation of PWM technologies in hardware is introduced in the last part.




Pulsed Power


Book Description

Mesyats' Pulsed Power provides in-depth coverage of the generation of pulsed electric power, electron and ion beams, and various types of pulsed electromagnetic radiation. The electric power that can be produced by the methods described ranges from 106 to 1014W for pulse durations of 10-10-10-7s. The book consists of nine parts containing 28 chapters, which deal with various aspects of pulsed power and high-power electronics and cover a concise theory of electric circuits as applied to nanosecond pulse technology; physics of fast processes occurring in electrical discharges in vacuum, gases, and liquids; phenomena in long lines; mechanisms of operation and designs of high-power gas-discharge, plasma, and semiconductor closing and opening switches as well as of high-power electric pulse generators using these switches; solid-state (semiconductor and magnetic) methods of production and transformation of nanosecond high-power pulses; and methods of production of high-power pulsed electron and ion beams. The closing part describes methods applied to produce high-power nanosecond pulsed X-rays, laser beams, microwaves, and ultrawideband electromagnetic radiation. This all-embracing book covers gas, laser, semiconductor, and magnetic circuit elements, the phenomenon of explosive electron emission discovered by the author, diodes of various types, including semiconductor diodes based on the SOS effect discovered with participation of the author, and methods of production of various types of high-power pulsed radiation.




Power Electronics


Book Description

This book is the result of the extensive experience the authors gained through their year-long occupation at the Faculty of Electrical Engineering at the University of Banja Luka. Starting at the fundamental basics of electrical engineering, the book guides the reader into this field and covers all the relevant types of converters and regulators. Understanding is enhanced by the given examples, exercises and solutions. Thus this book can be used as a textbook for students, for self-study or as a reference book for professionals.




Quantum Software


Book Description

This open access book explains the state of the art in quantum software engineering and design, independent from a specific hardware. It deals with quantum software theoretical aspects and with classical software engineering concepts like agile development approaches, validation, measurement, and deployment applied in a quantum or hybrid environment, and is complemented by a number of various industry applications. After an introductory chapter overviewing the contents of the subsequent chapters, the book is composed of three parts. It starts with a theoretical part on quantum software, as a bold declaration that quantum software theory is deep and valuable independent from the existence of specific quantum hardware. It is based upon the claim that quantum software is the more general theory subsuming classical and hybrid software system theories. The second, more extensive part deals with quantum software system and engineering design. Its quality follows from the comparison of the broad diversity of sometimes conflicting views. Moreover, the variety of approaches to design, enable the reader to make a well-pondered rational choice of preference. The book concludes with a third part, referring to multiple software applications and corresponding laboratory experiences, in order to understand their implications in practice and avoid repeating past mistakes. This book is of interest to industry professionals and researchers in academia, which are either producing or applying quantum software systems in their work or are considering their potential utility in the future. Furthermore, it also could be beneficial for practitioners already experienced with classical software engineering who desire to understand the fundamentals or possible applications of quantum software.




Mössbauer Spectroscopy of Environmental Materials and Their Industrial Utilization


Book Description

Mössbauer Spectroscopy of Environmental Materials and their Industrial Utilization provides a description of the properties of materials formed on the earth's surface, their synthetic analogs where applicable, and the products of their modifications in the course of natural processes, such as weathering, or in industrial processing as reflected in their Mössbauer spectra. Particular emphasis is placed on the way in which these processes can be observed and elucidated through the use of Mössbauer spectroscopy. The first chapter covers the basic theory of the Mössbauer effect and Chapters 2 and 3 deal with the nuts and bolts of experimental Mössbauer spectroscopy. The principles of these first three chapters, illustrated with many case studies, are applied to different areas of interest in Chapters 4 through 12. The book is directed to a broad audience ranging from graduate students in environmental sciences or chemical engineering with little or no expertise in Mössbauer spectroscopy to researchers from other disciplines who are familiar with this technique but wish to learn more about possible applications to environmental materials and issues.




Century of Endeavour


Book Description

This work is the study of a family's century long involvement with Irish self rule and political freedom. Joe Johnston (1890-1972), from a Tyrone Presbyterian small-farm background, had 3 elder brothers who made their careers in the Indian Civil Service. The family were 'Home Rule within the Empire' supporters in the Ulster liberal tradition. After studying classics and ancient history in Trinity College Dublin (TCD) and then in Oxford, JJ became a Fellow of Trinity in 1913. He then published his anti-Carson book Civil War in Ulster, attacking the process which culminated in the 1914 Larne gun-running. He contributed significantly to the emergent national movement. He wrote critically about 1930s economic policies, and went on the serve in the Irish Senate/Sennad from 1939 to 1954. His son RJ (b.1929) was a pioneer of the student left in TCD in the 1940s, and was associated with the post-war attempt to bring European Marxist thinking into the Irish labour movement, with the foundation of the Irish Workers League in 1948. After a period in London in the early 1960s, he returned to Dublin, this time as a research scientist, and helped Cathal Goulding in his attempt to get the 1960s generation of republicans to go political, in a democratic left-wing mode, decoupling from the Stalinist incubus. He helped set the stage for the emergence of the Civil Rights approach to reform in Northern politics, as a means of opening up an all-Ireland perspective. His opponents in the Republican movement, the Provisionals, opted for violence . In the ensuing decades he participated in various politicising processes which may, in the end, show the counter-productive nature of the role of the gun in politics, in Ireland and elsewhere. Roy Johnston lives in Dublin and continues to be politically active. "An important addition to any library of 20th century Irish Studies" Professor J.Skelly