Download or read book Pr vision du rayonnement acoustique des structures complexes et identification des sources written by Lionel Oddo and published by . This book was released on 1999 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le but de l'étude est d'utiliser deux approches différentes pour modéliser le comportement vibra-acoustique d'une structure complexe : une modélisation analytique et une modélisation systémique. La modélisation analytique s'est attachée au problème du rayonnement acoustique d'une coque cylindrique couplée à des structures mécaniques internes. Plusieurs exemples issus de simulations numériques et d'expérimentation ont mis en évidence le phénomène de «lissage fréquentiel» de la réponse vibra-acoustique de la coque. Cependant, ce phénomène requiert des conditions sévères sur les structures mécaniques internes : elles doivent être de forte densité modale et adaptées en impédance avec la coque. Si ces conditions sont respectées, alors il est possible d'estimer l'amortissement apparent de la coque, à partir de la formulation S.E.A. du facteur de perte par couplage. La modélisation systémique, par 1 'utilisation des réseaux de neurones, a été appliquée au problème de la localisation des efforts sur une structure. Pour cela, un réseau de neurone est construit à partir de la connaissance du champ vibratoire de la structure, ainsi que de la position de l'effort. Le réseau est alors capable de localiser un effort inconnu, d'après le champ vibratoire mesuré ou calculé. Il a été montré que la qualité des résultats fournis par le réseau de neurones dépendait fortement d'un critère en longueur d'onde sur la distance entre les efforts choisis pour l'apprentissage du réseau.
Download or read book Rayonnement acoustique des structures written by Dominique Trentin and published by . This book was released on 1990 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Identification de sources acoustiques complexes en milieu r verb rant par grands r seaux de microphones written by Hugo Demontis and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La directivité d'une source sonore intervient dans de nombreuses applications en acoustique, allant de la compréhension des phénomènes physiques aéro-acoustiques jusqu'à la reproduction sonore spatialisée. Pour estimer expérimentalement cette signature spatiale, il est d'usage de déployer les microphones de sorte à englober partiellement ou totalement les sources. Le rayonnement acoustique est ainsi capté dans toutes les directions de l'espace. Sur ce principe, nous proposons dans ce manuscrit le développement d'un réseau microphonique 3D de grandes dimensions. L'antenne baptisée MODO ("Les Murs Ont Des Oreilles") comprend un total de 1024 MEMS digitaux, répartis sur les murs et les parois d'une salle rectangulaire classique. Pour localiser les sources acoustiques et caractériser leur directivité, nous résolvons le problème inverse associé sous contrainte de parcimonie structurée. La méthode choisie exploite le faible nombre de sources dans la salle, autorisant une représentation parcimonieuse du champ sonore mesuré. Le formalisme des harmoniques sphériques est utilisé pour décomposer efficacement la directivité des sources et les composantes élémentaires de rayonnement qui la compose. Les trajets de propagation acoustique sont modélisés via l'intégration des fonctions de transfert de la salle, qui sont synthétisées grâce au principe des antennes virtuelles. Nous validons la méthode de caractérisation proposée sur des sources directives connues, dont la directivité est étalonnée au préalable à l'aide d'une antenne sphérique d'ordre élevé.
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 36 (thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 36 reports theses submitted in 1991, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 1993 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 36 reports (for thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 US universities. The organization of the volume, as in past years, consists of thesis titles arranged by discipline, and by university within each discipline. The titles are contributed by any and all a
Download or read book Safeguarding Traditional Cultures written by Peter Seitel and published by . This book was released on 2001 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings from a conference "A global assessment of the 1989 recommendation on the safeguarding of traditional culture and folklore" held at the Smithsonian Institution June 27-30 1999. The purpose of the conference was to assess the implementation of the Recommendation (an international normative instrument adopted by UNESCO in 1989), to bring together points of view and perspectives on the Recommendaion from around the world, and suggest ways in which the Recommendation might develop in the future so that its purpose, the safeguarding of traditional culture and folklore, might be achieved.
Download or read book Artificial Intelligence in Society written by OECD and published by OECD Publishing. This book was released on 2019-06-11 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The artificial intelligence (AI) landscape has evolved significantly from 1950 when Alan Turing first posed the question of whether machines can think. Today, AI is transforming societies and economies. It promises to generate productivity gains, improve well-being and help address global challenges, such as climate change, resource scarcity and health crises.
Download or read book Quantum Mechanics Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Download or read book Dictionary of French and English English and French written by John Bellows and published by . This book was released on 1911 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Relentless Pursuit of Tone written by Robert Fink and published by Oxford University Press. This book was released on 2018-09-18 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Relentless Pursuit of Tone: Timbre in Popular Music assembles a broad spectrum of contemporary perspectives on how "sound" functions in an equally wide array of popular music. Ranging from the twang of country banjoes and the sheen of hip-hop strings to the crunch of amplified guitars and the thump of subwoofers on the dance floor, this volume bridges the gap between timbre, our name for the purely acoustic characteristics of sound waves, and tone, an emergent musical construct that straddles the borderline between the perceptual and the political. Essays engage with the entire history of popular music as recorded sound, from the 1930s to the present day, under four large categories. "Genre" asks how sonic signatures define musical identities and publics; "Voice" considers the most naturalized musical instrument, the human voice, as racial and gendered signifier, as property or likeness, and as raw material for algorithmic perfection through software; "Instrument" tells stories of the way some iconic pop music machines-guitars, strings, synthesizers-got (or lost) their distinctive sounds; "Production" then puts it all together, asking structural questions about what happens in a recording studio, what is produced (sonic cartoons? rockist authenticity? empty space?) and what it all might mean.
Download or read book Submarine Mass Movements and Their Consequences written by Vasilios Lykousis and published by Springer Science & Business Media. This book was released on 2007-09-14 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from leading researchers in science and engineering, this book provides a global perspective on submarine mass movements and their consequences. Authors report on new findings from fundamental as well as site-specific studies from around the world. All studies relied on the most recent technologies, including multi-beam sonar imaging techniques, 3D seismic analysis, slope stability analysis, debris flow, and tsunami modeling.
Download or read book In Vessel Melt Retention and Ex Vessel Corium Cooling IAEA Tecdoc No 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Download or read book Musical Excellence written by Aaron Williamon and published by Oxford University Press. This book was released on 2004-06-17 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers performers, teachers, and researchers, new perspectives and practical guidance for enhancing performance and managing the stress that typically accompanies performance situations. It draws together the findings of pioneering initiatives from across the arts and sciences.
Download or read book The Oxford Handbook of Timbre written by Emily I. Dolan and published by Oxford University Press. This book was released on 2021-09-15 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite its importance as a central feature of musical sounds, timbre has rarely stood in the limelight. First defined in the eighteenth century, denigrated during the nineteenth, the concept of timbre came into its own during the twentieth century and its fascination with synthesizers and electronic music-or so the story goes. But in fact, timbre cuts across all the boundaries that make up musical thought-combining scientific and artistic approaches to music, material and philosophical aspects, and historical and theoretical perspectives. Timbre challenges us to fundamentally reorganize the way we think about music. The twenty-five essays that make up this collection offer a variety of engagements with music from the perspective of timbre. The boundaries are set as broad as possible: from ancient Homeric sounds to contemporary sound installations, from birdsong to cochlear implants, from Tuvan overtone singing to the tv show The Voice, from violin mutes to Moog synthesizers. What unifies the essays across this vast diversity is the material starting point of the sounding object. This focus on the listening experience is radical departure from the musical work that has traditionally dominated musical discourse since its academic inception in late-nineteenth-century Europe. Timbre remains a slippery concept that has continuously demanded more, be it more precise vocabulary, a more systematic theory, or more rigorous analysis. Rooted in the psychology of listening, timbre consistently resists pinning complete down. This collection of essays provides an invitation for further engagement with the range of fascinating questions that timbre opens up.
Download or read book Thermal Quadrupoles written by Denis Maillet and published by . This book was released on 2000-11-17 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This superb text describes a novel and powerful method for allowing design engineers to firstly model a linear problem in heat conduction, then build a solution in an explicit form and finally obtain a numerical solution. It constitutes a modelling and calculation tool based on a very efficient and systemic methodological approach. Solving the heat equations through integral transforms does not constitute a new subject. However, finding a solution generally constitutes only one part of the problem. In design problems, an initial thermal design has to be tested through the calculation of the temperature or flux field, followed by an analysis of this field in terms of constraints. A modified design is then proposed, followed by a new thermal field calculation, and so on until the right design is found. The thermal quadrupole method allows this often painful iterative procedure to be removed by allowing only one calculation. The chapters in this book increase in complexity from a rapid presentation of the method for one dimensional transient problems in chapter one, to non uniform boundary conditions or inhomogeneous media in chapter six. In addition, a wide range of corrected problems of contemporary interest are presented mainly in chapters three and six with their numerical implementation in MATLAB (r) language. This book covers the whole scope of linear problems and presents a wide range of concrete issues of contemporary interest such as harmonic excitations of buildings, transfer in composite media, thermal contact resistance and moving material heat transfer. Extensions of this method to coupled transfers in a semi-transparent medium and to mass transfer in porous media are considered respectively in chapters seven and eight. Chapter nine is devoted to practical numerical methods that can be used to inverse the Laplace transform. Written from an engineering perspective, with applications to real engineering problems, this book will be of significant interest not only to researchers, lecturers and graduate students in mechanical engineering (thermodynamics) and process engineers needing to model a heat transfer problem to obtain optimized operating conditions, but also to researchers interested in the simulation or design of experiments where heat transfer play a significant role.
Download or read book Government at a Glance Southeast Asia 2019 written by OECD and published by OECD Publishing. This book was released on 2019-09-10 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Government at a Glance Southeast Asia 2019 is the first edition in the Government at a Glance series for the region. It provides the latest available data on public administrations in the 10 ASEAN member countries: Brunei Darussalam, Cambodia, Indonesia, Lao People’s Democratic Republic, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Viet Nam.
Download or read book The Orchestral Revolution written by Emily I. Dolan and published by Cambridge University Press. This book was released on 2013-01-17 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the relationship between the history of orchestration and the development of modern musical aesthetics in the Enlightenment. Using Haydn as a focal point, it examines how the consolidation of the modern orchestra radically altered how people listened to and thought about the expressive capacity of instruments.
