Akustik

Hohe Spröd-duktil-Übergangstemperaturen schließen den Einsatz von konventionell gefertigtem Wolfram (W) als Strukturwerkstoff aus. Ultrafeinkörnige (UFG) W-Werkstoffe zeigen jedoch den Spröd-duktil-Übergang bereits bei sehr tiefen Temperaturen und weisen folglich Raumtemperaturduktilität auf. Die korrelative Mikrostrukturanalyse offenbarte einen starken Zusammenhang zwischen der Übergangstemperatur und dem mittleren Korngrenzenabstand entlang der Rissfront. High brittle-ductile transition temperatures preclude the use of conventionally manufactured tungsten (W) as a structural material. Ultrafine grained (UFG) W materials, however, exhibit the brittle-ductile transition at very low temperatures and consequently exhibit room-temperature ductility. The correlative microstructure analysis revealed a strong correlation between the transition temperature and the mean grain boundary spacing along the crack front.

Im Zuge der fortschreitenden Elektrifizierung der Fahrzeuge fällt mit steigender Effizienz die zur Verfügung stehende Abwärme des Antriebsstrangs zur Deckung des Wärmebedarfs des Innenraums. Um der dadurch reduzierten elektrischen Reichweite entgegenzuwirken, befasst sich diese Arbeit mit der Entwicklung eines ganzheitlichen energieeffizienten Thermomanagement-Systems auf Basis einer umkehrbaren Wärmepumpe, welches mit einer nichtlinearen modellprädiktiven Regelung geregelt wird. In the course of the electrification of drive systems less waste heat is generated to cover the heat demand of the passenger cabin, which results in a significantly reduced electric range in cold seasons or climate regions. This work deals with the development of a holistic energy-efficient thermal management system to avoid a range drop due to thermal conditioning and uses nonlinear model predictive control approach to exploit the full potential of the system.

Source Modeling.- Experimental Techniques.- Analytical Developments.- Numerical Methods.

This book offers detailed insights into new methods for high-fidelity CFD, and their industrially relevant applications in aeronautics. It reports on the H2020 TILDA project, funded by the European Union in 2015-2018. The respective chapters demonstrate the potential of high-order methods for enabling more accurate predictions of non-linear, unsteady flows, ensuring enhanced reliability in CFD predictions. The book highlights industrially relevant findings and representative test cases on the development of high-order methods for unsteady turbulence simulations on unstructured grids; on the development of the LES/DNS methodology by means of multilevel, adaptive, fractal and similar approaches for applications on unstructured grids; and on leveraging existent large-scale HPC networks to facilitate the industrial applications of LES/DNS in daily practice. Furthermore, the book discusses multidisciplinary applications of high-order methods in the area of aero-acoustics. All in all, it offers timely insights into the application and performance of high-order methods for CFD, and an extensive reference guide for researchers, graduate students, and industrial engineers whose work involves CFD and turbulence modeling.

As the author mentions in the Preface, the intent of the book is to explain in a non-technical manner the main outlines of parts of science specially related to the questions and problems of music, assuming no previous knowledge either of science or of mathematics on the part of the reader.Sir James Jeans, who was a noted British scientist, gave a physical analysis of musical sounds, in what is considered to be the best exposition on the subject, a book of great intellectual stature. His aim was to convey precise information, in a simple non-technical way, that will be of interest to the amateur as well as the serious student of music.The discussion begins with an explanation of the development of the human faculty of hearing. For example, why do some sounds produce pleasure when they reach our ears and some pain? How do we retain the pleasurable quality, as it passes on from one stage of electronic equipment to another? These and other pertinent questions on the transmission and reproduction of sound are answered. The various methods of producing sound, and the qualities of the sounds produced, are further discussed as they relate to vibrations of strings and harmonics, and vibrations of air. Harmony and discord are also considered. In the final chapters on the concert room and hearing, the discussion focuses on the transmission of sound from its source to the eardrum and from the eardrum to the brain. A general theory of acoustics is also covered as well as acoustical analyses."Science and Music is a rare book, as an author does not often combine very distinguished scientific abilities with musical knowledge and power of simple exposition. It will probably become a minor classic." - Manchester Guardian.

En 1855, le télégraphe électrique a remplacé, en France, le télégraphe aérien, forcé de disparaître devant son puissant rival. La télégraphie aérienne est donc un peu oubliée aujourd'hui. Cependant, cette invention a sa glorieuse histoire. Elle est française, et par son inventeur et par le gouvernement qui l'accueillit et la propagea, au milieu des embarras et des périls de la guerre étrangère. Sans doute, nous envisageons aujourd'hui avec quelque pitié ces grêles tiges de fer, qui se dessinaient sur le fond du ciel, agitant leurs bras persillés, ne transmettant des signaux que pendant le jour, et par une atmosphère sereine. Mais si l'on se reporte à l'époque de cette invention, c'est-à-dire au temps des diligences et des malles-postes, on partagera l'admiration qu'ont éprouvée nos pères, quand ils voyaient transmettre en une heure une dépêche de Paris à Marseille, à travers une série de postes échelonnés, sans que les signaux, étalés librement aux yeux de tous, fussent compris par personne, sinon par l'expéditeur de Paris et le destinataire de Marseille...

This book contains selected and expanded contributions presented at the 15th Conference on Acoustics and Vibration of Mechanical Structures held in Timisoara, Romania, May 30-31, 2019. The conference focused on a broad range of topics related to acoustics and vibration, such as analytical approaches to nonlinear noise and vibration problems, environmental and occupational noise, structural vibration, biomechanics and bioacoustics, as well as experimental approaches to vibration problems in industrial processes.The different contributions also address the analytical, numerical and experimental techniques applicable to analyze linear and non-linear noise and vibration problems (including strong nonlinearity) and they are primarily intended to emphasize the actual trends and state-of-the-art developments in the above mentioned topics.The book is meant for academics, researchers and professionals, as well as PhD students concerned with various fields of acoustics and vibration of mechanical structures.

This book presents the state of the art in approaches, methodologies and systems from the emerging field of automation in music mixing and mastering. A comprehensive guide, providing an introductory read for beginners, as well as a crucial reference point for experienced researchers, producers, engineers and developers.

Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7: Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics, 2018, the seveth volume of nine from the Conference brings together contributions to this important area of research and engineering.  The collection presents early findings and case studies on fundamental and applied aspects of Rotating Machinery, Hybrid Testing, Vibro-Acoustics & Laser Vibrometry, including papers on:Rotating MachineryVibro-AcousticsExperimental TechniquesScanning Laser Doppler Vibrometry Methods

Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems, Volume 7 of the Proceedings of the 2018 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, the seventh volume of eight from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on a wide range of areas, including:Inverse Problems/Hybrid TechniquesMaterial Characterizations Using ThermographyThermoelastic Stress AnalysisFatigue & Damage Evaluation Using Infrared ThermographyIntegration of Infrared Thermography & DICThermographic Non-Destructive Evaluation (NDE)

Power electronics technology is still an emerging technology, and it has found its way into many applications, from renewable energy generation (i.e., wind power and solar power) to electrical vehicles (EVs), biomedical devices, and small appliances, such as laptop chargers. In the near future, electrical energy will be provided and handled by power electronics and consumed through power electronics; this not only will intensify the role of power electronics technology in power conversion processes, but also implies that power systems are undergoing a paradigm shift, from centralized distribution to distributed generation. Today, more than 1000 GW of renewable energy generation sources (photovoltaic (PV) and wind) have been installed, all of which are handled by power electronics technology. The main aim of this book is to highlight and address recent breakthroughs in the range of emerging applications in power electronics and in harmonic and electromagnetic interference (EMI) issues at device and system levels as discussed in ‎robust and reliable power electronics technologies, including fault prognosis and diagnosis technique stability of grid-connected converters and ‎smart control of power electronics in devices, microgrids, and at system levels.

Acoustics is a branch of physics that is concerned with the study of mechanical waves in different media such as solids, liquids and gases. The study covers the generation, propagation and reception of mechanical waves and vibrations. The subdisciplines of acoustics are archaeoacoustics, aeroacoustics, acoustic signal processing, architectural acoustics, musical acoustics, etc. An understanding of different mechanical waves such as pressure waves, surface waves, transverse and longitudinal waves is crucial for a comprehensive understanding of acoustics. The applications of acoustics are in medicine, audio and noise control, climate change monitoring, sonar for submarine detection, etc. The book aims to shed light on some of the unexplored aspects of acoustics and the recent researches in this field. The various sub-fields of acoustics along with technological progress that have future implications are glanced at in this book. It aims to equip students and experts with the advanced topics and upcoming concepts in this area of study.

What if I told you that the symbolism we see is actually rooted in truth? Imagine for a moment that you now have the ability to understand what is taught in the ancient schools of mysticism? That I can show you how everything in the entire Universe correlates to each other... Come, Take a ride with me, you will be amazed!

A music-career book like no other, The Music Producer's Survival Guide offers a wide-ranging, exploratory, yet refreshing down-to-earth take on living the life of the independent electronic music producer. If you are an intellectually curious musician/producer eager to make your mark in today's technologically advanced music business, you're in for a treat.

23:B&W 6 x 9 in or 229 x 152 mm Perfect Bound on White w/Gloss Lam