Download or read book Etude de la propagation des ondes de choc en milieu confin g om trie complexe written by Baptiste Julien and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La sécurité des biens et des personnes est, de nos jours, une préoccupation première, en particulier lorsqu'elle concerne l'usage des explosifs. Afin de répondre à ces exigences de sécurité, il est nécessaire de pouvoir prédire le comportement des ondes de pression issues d'une explosion, que ce soit à l'intérieur ou à l'extérieur du bâtiment, et leur interaction avec leur environnement. Une importante quantité d'informations sur les ondes de choc se propageant en champ libre est disponible dans la littérature, de sorte que leur comportement est maintenant bien connu. Toutefois, il y a très peu de données disponibles en littérature ouverte sur les explosions en milieu confiné. Les travaux présentés dans ce mémoire de thèse s'inscrivent dans le cadre de l'étude du comportement des ondes de choc en milieu confiné multi-chambres et de l'effet de différents paramètres tels que le volume des cellules ou la largeur du couloir sur les profils de pression à l'intérieur d'un bâtiment. La propagation de l'onde de choc est analysée par l'évolution de certains paramètres du choc (temps d'arrivée, surpression maximale et impulsion positive).Plusieurs essais à échelle réduite ont été réalisés à l'aide d'une maquette modulable, représentative d'un bâtiment pyrotechnique de plein pied, composé de quatre pièces alignées et reliées entre elles par un couloir.
Download or read book Etude de la propagation des ondes de choc en milieu confin written by Kévin Gault and published by . This book was released on 2018 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: De nos jours, la sécurité des installations publiques, industrielles ou militaires est une problématique majeure. Les phénomènes de détonations en champ libre sont bien connus et documentés. Néanmoins les modèles et les lois mises en place ne s’appliquent pas dans le cas d’explosions confinées.Les travaux présentés dans ce mémoire de thèse portent sur l’étude de la propagation des ondes de choc dans des géométries simples et fermées. Différents paramètres ont été étudiés tels que l’influence du volume, de la position d’amorçage ou encore de la taille de l’évent.Les essais réalisés à petite échelle, dans deux maquettes expérimentales ont permis de mettre en place des lois prédictives portant sur les principaux paramètres de l’onde de choc incidente et réfléchie que sont la surpression maximale, le temps d’arrivée ainsi que l’impulsion.Ces lois ont ensuite été implémentées dans un code de calculs permettant d’automatiser la recherche des réflexions et des différents paramètres associés dans des configurations géométriques simples.
Download or read book Etude de la propagation des ondes de choc dans des milieux diphasiques written by G. Parmentier and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Etude des ph nom nes physiques associ s la propagation d ondes cons cutives une explosion et leur interaction avec des structures dans un environnement complexe written by Pierre-Emmanuel Sauvan and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux présentés dans ce mémoire de thèse s'inscrivent dans le cadre des études liées aux dégâts sur les structures et les blessures subies par les personnes à la suite d'explosions de charges explosives en milieu confiné et semi-confiné. Afin de mener cette étude, des expériences sont réalisées à petite échelle en laboratoire et sont complétées par des simulations numériques. Les ondes de choc sont obtenues grâce à la détonation d'une charge explosive gazeuse composée de propane-oxygène en proportion stoechiométrique. L'étude consiste donc à réaliser des expériences à petite échelle en laboratoire afin d'apprécier les champs de pression obtenus à la suite de la détonation d'une charge explosive au sein de deux configurations différentes. La première représente un atelier pyrotechnique et la seconde met en jeu un entrepôt de stockage de bouteilles de gaz. Les résultats expérimentaux sont ensuite confrontés à des résultats obtenus par simulations numériques réalisées grâce au logiciel AUTODYN. En complément de ces deux configuration principales, une étude est menée sur l'identification des pics de surpressions réfléchis grâce à une approche expérimentale appelée paroi par paroi. Une étude est également menée sur la détermination d'une équivalence massique entre le TNT et le mélange gazeux utilisé pour les expériences.
Download or read book CONTRIBUTION A L ETUDE DE LA PROPAGATION DES ONDES DE CHOC DANS L ATMOSPHERE written by CHRISTOPHE.. PEYRET and published by . This book was released on 1995 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: PHYSIQUEMENT, APRES UNE EXPLOSION AERIENNE D'ORIGINE NATURELLE OU ARTIFICIELLE, L'ONDE ACOUSTIQUE EMISE SE PROPAGE DANS L'ATMOSPHERE SUR DES DISTANCES DE PLUSIEURS MILLIERS DE KILOMETRES. DU FAIT DE L'EXTENSION GEOMETRIQUE DE LA PERTURBATION, L'ENERGIE ACOUSTIQUE SE REPARTIT SUR UN VOLUME D'AIR CROISSANT ET DEVIENDRAIT RAPIDEMENT INDECELABLE SI PLUSIEURS FACTEURS NE FAVORISAIENT PAS SA FOCALISATION EN CERTAINES ZONES. DANS LA PRESENTE THESE, UNE MODELISATION PHYSIQUE ET NUMERIQUE DE LA PROPAGATION DES ONDES ACOUSTIQUES DANS L'ATMOSPHERE SONT REALISEES. LA PROPAGATION S'EFFECTUE DU SOL JUSQU'A 200 KM D'ALTITUDE ET VA JUSQU'A 300 KM DE LA SOURCE. DEUX APPROCHES NUMERIQUES SONT PRESENTEES ET COMPAREES. ENFIN, UNE CONFRONTATION DES SIMULATIONS NUMERIQUES ET DE RESULTATS EXPERIMENTAUX EST REALISEE. ELLE FAIT APPARAITRE DES TEMPS D'ARRIVEE VOISINS ET DES DETECTIONS CONCORDANTES ENTRE LES MESURES ET LES SIMULATIONS. DANS L'ENSEMBLE, LES RESULTATS OBTENUS SONT POSITIFS ET MONTRENT PLUSIEURS VOIES QU'IL SERAIT DESORMAIS NECESSAIRES D'ABORDER POUR LA POURSUITE DE CETTE ETUDE. AUSSI, IL EST POSSIBLE DE CONCLURE FAVORABLEMENT SUR LE BIEN FONDE D'UN RESEAU MONDIAL DE CAPTEURS MICROBAROGRAPHIQUES UTILISE EN VUE D'UNE SURVEILLANCE DES TIRS NUCLEAIRES OU CHIMIQUES PUISSANTS REALISES DANS L'ATMOSPHERE
Download or read book tude th orique et exp rimentale de la propagation des ondes hyperfr quences en milieu confin et urbain written by Philippe Mariage and published by . This book was released on 1992 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: De nombreuses applications des radiocommunications utilisant une porteuse hyperfréquence font intervenir des phénomènes de propagation par chemins multiples. La planification des systèmes de télécommunication envisagés dans ce travail nécessite la réalisation d'outils de prédiction. Ceux-ci ont été élaborés en utilisant une méthode numérique haute fréquence: la Théorie Uniforme de la Diffraction (TUD). Dans cette théorie, le concept de rayon de l'Optique Géométrique est étendu aux phénomènes de diffraction, ce qui permet de prendre en compte les trajets multiples suivis par l'onde rayonnée. Après avoir étudié au préalable et de manière approfondie la configuration canonique du dièdre électrique faiblement conducteur à bord droit, nous avons effectué des comparaisons théoriques et numériques entre les méthodes de prédictions approchées classiques des pertes en milieu urbain et des modèles basés sur la T.U.D. Nous avons également modélisé le cas d'une bifurcation entre deux couloirs de bâtiment, le but étant de définir le couplage moyen obtenu au passage de ce type de transition. Dans le cadre de la propagation en tunnel, nous avons envisagé le cas important de la présence d'une rame située entre l'émetteur et le récepteur. La perturbation apportée par le masquage de cette rame sur le niveau moyen du champ est analysée en considérant le cas d'un rétrécissement localisé de la section droite du tunnel
Download or read book Mod lisation de la propagation d ondes hyperfr quences en milieu confin ou urbain written by Sylvie Magniez Baranowski and published by . This book was released on 1999 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Continuum Mechanics Through the Twentieth Century written by Gerard A Maugin and published by Springer Science & Business Media. This book was released on 2013-04-08 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This overview of the development of continuum mechanics throughout the twentieth century is unique and ambitious. Utilizing a historical perspective, it combines an exposition on the technical progress made in the field and a marked interest in the role played by remarkable individuals and scientific schools and institutions on a rapidly evolving social background. It underlines the newly raised technical questions and their answers, and the ongoing reflections on the bases of continuum mechanics associated, or in competition, with other branches of the physical sciences, including thermodynamics. The emphasis is placed on the development of a more realistic modeling of deformable solids and the exploitation of new mathematical tools. The book presents a balanced appraisal of advances made in various parts of the world. The author contributes his technical expertise, personal recollections, and international experience to this general overview, which is very informative albeit concise.
Download or read book Boundary Layer Theory written by Hermann Schlichting (Deceased) and published by Springer. This book was released on 2016-10-04 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of the near-legendary textbook by Schlichting and revised by Gersten presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with particular emphasis on the flow past bodies (e.g. aircraft aerodynamics). The new edition features an updated reference list and over 100 additional changes throughout the book, reflecting the latest advances on the subject.
Download or read book Programme Music in the Last Four Centuries written by Frederick Niecks and published by Ardent Media. This book was released on 2009-08 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1907. Not illustrated. Excerpt: ... CHAPTER IV. IN GERMANY. The writing of the present chapter cannot be called an inspiring task. Without Wagner's sovereign contempt for the music of his time, and Tchaikovsky's belief in Germany's complete exhaustion, one may yet be unable to grow enthusiastic over the theme. The productivity during the period with which we are concerned has been enormous. But how about the really valuable outcome of it? In the latter part of the 19th century the question was often asked: What remains if you remove from the living German composers Wagner and Brahms? And then there were ever so many people who, while heartily admitting the greatness of one of the two, were not so sure of the other--not to mention those who were all for the one and would have none whatever of the other. Now, ' this exclusive way of looking at men and things is not only unfair, it is absolutely foolish. The men of genius leave room for the men of talent; and the masters en grand for the masters en miniature. To be sure for some time past Germany has not been abounding in musical genius of the first or even second order. But if there has been a dearth of powerful original creativeness and of strikingly outstanding individuality, there has been also a goodly provision of artistic ability well deserving our respect and gratitude, ability displaying itself not merely in technical skill, but often also in imaginativeness, sensibility, and poetic charm. The great bulk of crudities, futilities, and vacuities need not trouble us: they are not peculiar to any one period. One could classify composers into (1) such as write only absolute music, and are uninfluenced by and even averse to the programmatic tendency; (2) such as write programme music, but only in the classical manner and forms; (3) such as go only ...
Download or read book The Theory of Ionization of Gases by Collision written by Sir John Townsend and published by . This book was released on 1910 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Narratives of fear and safety written by Kaisa Kaukiainen and published by BoD - Books on Demand. This book was released on 2020-09-01 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: The essays in this edited volume, written in English and French, tackle the intriguing problems of fear and safety by analysing their various meanings and manifestations in literature and other narrative media. The articles bring forth new, cross-cultural interpretations on fear and safety through examining what kinds of genre-specific means of world-making narratives use to express these two affectivities. The articles also show how important it is to study these themes in order to understand challenges in times of global threats, such as the climate crisis. The main themes of the book are approached from various theoretical perspectives as related to their literary and cultural representations. Recent trends in research, such as affect and risk theory, serve as the basis for the discussion. The articles in the volume also draw from disciplines such as gender studies and trauma studies to examine the threats posed by collective fears and aggression on individuals' lives and propose ways of coping with fear. These themes are addressed also in articles analysing new adaptations of old myths that retell stories of the past. Many of the articles in the volume discuss apocalyptic and dystopian narratives that currently permeate the entire cultural landscape. Dystopian narratives do not only deal with future threats, such as totalitarianism, technocracy, or environmental disasters, but also suggest alternative ways of being and new hopes in the form of political resistance.
Download or read book Buyology written by Martin Lindstrom and published by Currency. This book was released on 2010-02-02 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: NEW YORK TIMES BESTSELLER • “A fascinating look at how consumers perceive logos, ads, commercials, brands, and products.”—Time How much do we know about why we buy? What truly influences our decisions in today’s message-cluttered world? In Buyology, Martin Lindstrom presents the astonishing findings from his groundbreaking three-year, seven-million-dollar neuromarketing study—a cutting-edge experiment that peered inside the brains of 2,000 volunteers from all around the world as they encountered various ads, logos, commercials, brands, and products. His startling results shatter much of what we have long believed about what captures our interest—and drives us to buy. Among the questions he explores: • Does sex actually sell? • Does subliminal advertising still surround us? • Can “cool” brands trigger our mating instincts? • Can our other senses—smell, touch, and sound—be aroused when we see a product? Buyology is a fascinating and shocking journey into the mind of today's consumer that will captivate anyone who's been seduced—or turned off—by marketers' relentless attempts to win our loyalty, our money, and our minds.
Download or read book Resonant Recoveries written by Jillian C. Rogers and published by Oxford University Press. This book was released on 2021 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: "French Music and Trauma Between the World Wars illustrates that coping with trauma was a central concern for French musicians active after World War I. The losses and violent warfare of World War I shaped how interwar French musicians-from those fighting in the trenches and working in military hospitals to more well-known musicians-engaged with music. Situated at the intersections of musicology, history, sound and performance studies, and psychology and trauma studies, Resonant Recoveries argues that modernists' compositions and musical activities were sonorous locations for managing and performing trauma. Through analysis of archival materials, French medical, philosophical, and literary texts, and the music produced between the wars, this book illuminates how music emerged during World War I as an embodied technology of consolation. Resonant Recoveries demonstrates that music making came to be understood by French interwar musicians as a consolatory practice that enhanced their abilities to remember lost loved ones, gave them opportunities to perform their grief publicly and privately, allowed them to create healing bonds of friendship, and soothed them with sonic vibrations and the rhythmically regular bodily movements required in order to perform many French neoclassical compositions. In revealing the importance music making held for interwar French musicians, this book refigures French modernist music as a therapeutic medium for creators, performers, and audiences, while also underlining the importance of addressing trauma, mourning, and people's emotional lives in music scholarship"--
Download or read book Before We Visit the Goddess written by Chitra Banerjee Divakaruni and published by Simon and Schuster. This book was released on 2017-04-25 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A new novel from the author of Oleander Girl, a novel in stories, built around crucial moments in the lives of 3 generations of women in an Indian/Indian-American Family"--
Download or read book Epic and Empire written by David Quint and published by Princeton University Press. This book was released on 2021-01-12 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alexander the Great, according to Plutarch, carried on his campaigns a copy of the Iliad, kept alongside a dagger; on a more pronounced ideological level, ancient Romans looked to the Aeneid as an argument for imperialism. In this major reinterpretation of epic poetry beginning with Virgil, David Quint explores the political context and meanings of key works in Western literature. He divides the history of the genre into two political traditions: the Virgilian epics of conquest and empire that take the victors' side (the Aeneid itself, Camoes's Lusíadas, Tasso's Gerusalemme liberata) and the countervailing epic of the defeated and of republican liberty (Lucan's Pharsalia, Ercilla's Araucana, and d'Aubigné's Les tragiques). These traditions produce opposing ideas of historical narrative: a linear, teleological narrative that belongs to the imperial conquerors, and an episodic and open-ended narrative identified with "romance," the story told of and by the defeated. Quint situates Paradise Lost and Paradise Regained within these rival traditions. He extends his political analysis to the scholarly revival of medieval epic in the late eighteenth and nineteenth centuries and to Sergei Eisenstein's epic film, Alexander Nevsky. Attending both to the topical contexts of individual poems and to the larger historical development of the epic genre, Epic and Empire provides new models for exploring the relationship between ideology and literary form.
Download or read book Proceedings of the Royal Geographical Society of London written by Royal Geographical Society (Great Britain) and published by . This book was released on 1873 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
