Bølgemekanik (vibration og akustik)

This book reviews basic electromagnetic (EM) wave theory and applies it specifically to lasers in order to give the reader not only tangible examples of how the theory is manifested in real life, but also practical knowledge about lasers, and their operation and usage. The latter can be useful for those involved with using lasers. As a short treatise on this subject matter, this book is not intended to dwell deeply into the details of EM waves nor lasers. A bibliography is provided for those who wish to explore in more depth the topics covered in this book. Rather the aim of this book is to offer a quick overview, which will allow the reader to gain a competent general understanding of EM waves and lasers.

Sound-Power Flow: A practitioner's handbook for sound intensity is a guide for practitioners and research scientists in different areas of acoustical science. There are three fundamental quantities in acoustics: sound pressure, sound particle velocity, and sound intensity. This book is about sound intensity and demonstrates the advantages and uses of acoustical sensing compared with other forms of sensing. It describes applications such as: measuring total sound power; directional hearing of humans and mammals; echolocation; measuring sound-power flow in ducts; and uses of non-contact, focused, high-frequency, pulse-echo ultrasonic probes.This book presents computational approaches using standard mathematics, and relates these to the measurement of sound-power flow in air and water. It also uses linear units rather than logarithmic units - this making computation in acoustics simpler and more accessible to advanced mathematics and computing. The book is based on work by the author and his associates at General Motors, the University of Mississippi, and Sonometrics.

This book covers the technology of switching or modulating light in semiconductor optical waveguides. Currently a key function for optical communications systems is the conversion of data from an electrical signal to an optical signal for transmission in very low loss optical fibres and the converse process of optical to electrical conversion the O/E/O data conversion. This conversion between electronic and photonic signals imposes an energy consumption overhead on optical communication systems. So many research workers have been attracted to ultrafast all-optical switching of data in different formats. As a way of introduction to all-optical switching in semiconductor waveguides the book covers the electro-optic effect, electroabsorption and electrorefraction; effects that can be used in semiconductor optical modulation devices. But the book focuses on all-optical switching using second and third order optical nonlinearities in AlGaAs optical waveguides. It covers a variety of device configurations including integrated nonlinear couplers and Mach-Zehnder interferometers. Further, it provides design software in suit of Mathematica notebooks that can be used to explore the device design.

These books provide a state-of-the-art treatment of mathematical theories of vibration. The first volume discusses numerical and semi-analytical methods to be used in solving various vibration problems. It is an invaluable guide for graduate and postgraduate students, teachers and researchers in various fields including applied mathematics, physics and engineering.

During the nineteenth century, a remarkable scientific instrument known as a harmonograph revealed the beautiful patterns found in music. Harmonograph is an introduction to the evolution of simple harmonic theory, from the discoveries of Pythagoras to diatonic tuning and equal temperament. Beautiful drawings show the octave as a triangle, the fifth as a pentagram; diagrams show the principles of harmonics, overtones, and the monochord. Anthony Ashton examines the phenomenon of resonance in Chladni patterns, describes how to build a harmonograph of your own, and provides tables of world tuning systems. This inspiring book will appeal to musicians, mathematicians, designers, and artists alike.

The first edition of this book presented the principles of vibration and sound with only a little discussion of applications of these principles. During the past eight years, our own experience, as well as that of other teachers who used it as a textbook, has indicated that students would benefit from more discussion of applications. In this edition we have revised some of the mate- rial in the first nine chapters, but more importantly we have added four new chapters dealing with applications, including microphones, loudspeakers, and other transducers; acoustics of concert halls and studios; sound and noise outdoors; and underwater sound. Of course we could have selected many additional applications of vibration and sound, but that would have led to a book with too much material for the average acoustics course in physics and engineering departments. We think there is now ample material in the book so that instructors may select the applications of particular in- terest and omit the others without loss of continuity. We have continued to stress concepts over detailed theory, as seems most appropriate for an in- troductory course. We appreciate the comments we have received from users, students, and teachers alike, and we continue to welcome feedback. September 2003 Thomas D. Rossing Neville H. Fletcher Preface to the First Edition Some years ago we set out to write a detailed book about the basic physics of musical instruments.

The 34 chapters of the 2nd edition of How to Gain Gain give a detailed insight into a collection (54) of the most common gain producing, constant current generating possibilities, and electronic noise creation of triodes for audio pre-amplifier purposes. These chapters also offer complete sets of formulae to calculate gain, frequency and phase responses, and signal-to-noise ratios of certain building blocks built-up with this type of vacuum valve (tube). In all cases detailed derivations of the gain formulae are also presented. All what is needed are the data sheet valve characteristic figures of the triode's mutual conductance, the gain factor and the internal plate (anode) resistance. To calculate frequency and phase responses of gain stages the different data sheet based input and output capacitances have to be taken into account too. To calculate transfer functions and signal-to-noise ratios for any kind of triode driven gain stage, including all its bias setting, frequency, phase, and electronic noise influencing components, example Mathcad 11 worksheets as an essential simulation tool for each chapter allow easy follow-up and application of the respective formulae. Free download of all worksheets is guaranteed from the editor's web-site.

Reality Is Not What It Seems: The Journey to Quantum Gravity is a thought-provoking book written by the renowned physicist, Carlo Rovelli. Published in 2018 by Riverhead, this book dives deep into the genre of science and physics. Rovelli, with his eloquent writing and profound understanding, takes the readers on a journey through the enigmatic world of quantum gravity. The book challenges our understanding of reality, suggesting that it's not as we perceive it to be. It's a must-read for those curious about the mysteries of the universe. Riverhead, known for publishing intellectually stimulating works, adds another gem to its collection with this book.

This book details the ideas underlying geometrical theory of diffraction (GTD) along with its relationships with other EM theories.

"Having made his name in the late 1980s as a member of the indie band Galaxie 500, Damon Krukowski has watched cultural life lurch from analog to digital. And as an artist who has weathered the transition, he has challenging, urgent questions for both creators and consumers about what we have thrown away in the process: Are our devices leaving us lost in our own headspace even as they pinpoint our location? Does the long reach of digital communication come at the sacrifice of our ability to gauge social distance? Do streaming media discourage us from listening closely? Are we hearing each other fully in this new environment? Rather than simply rejecting the digital disruption of cultural life, Krukowski uses the sound engineer's distinction of signal and noise to reexamine what we have lost as a technological culture, looking carefully at what was valuable in the analog realm so we can hold on to it. Taking a set of experiences from the production and consumption of music that have changed since the analog era--the disorientation of headphones, flattening of the voice, silence of media, loudness of mastering, and manipulation of time--as a basis for a broader exploration of contemporary culture, Krukowski gives us a brilliant meditation and guide to keeping our heads amid the digital flux. Think of it as plugging in without tuning out."--Book jacket.