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Etude Des Lignes De Transmission Non Lineaires Pour La Generation Et La Propagation Dimpulsions Ultra Courtes
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Book Synopsis ETUDE DES LIGNES DE TRANSMISSION NON LINEAIRES POUR LA GENERATION ET LA PROPAGATION D'IMPULSIONS ULTRA-COURTES by : Akil Jrad
Download or read book ETUDE DES LIGNES DE TRANSMISSION NON LINEAIRES POUR LA GENERATION ET LA PROPAGATION D'IMPULSIONS ULTRA-COURTES written by Akil Jrad and published by . This book was released on 1999 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE LIGNE DE PROPAGATION NON LINEAIRE EST UNE LIGNE DE TRANSMISSION COPLANAIRE PASSIVE ET LINEAIRE, PERIODIQUEMENT CHARGEE PAR DES ELEMENTS NON LINEAIRES (DES DIODES SCHOTTKY ICI). LA CAPACITE INVERSE DU CONTACT SCHOTTKY VARIANT AVEC LA TENSION, LA VITESSE DE PROPAGATION D'UN SIGNAL LE LONG D'UNE TELLE LIGNE DEPEND EGALEMENT DE SON AMPLITUDE. AINSI PLUS L'AMPLITUDE D'UN SIGNAL EST GRANDE PLUS LA VITESSE DE PROPAGATION L'EST EGALEMENT : LES FORTES AMPLITUDES SE PROPAGENT DONC PLUS VITE QUE LES FAIBLES AMPLITUDES. CE TRAVAIL A CONSISTE A DEVELOPPER UNE METHODE PERMETTANT LA SYNTHESE DE LIGNES DE PROPAGATION NON LINEAIRES OPTIMISEES EN TERMES DE PERFORMANCES POUR LA GENERATION D'ONDES DE CHOC. LA DETERMINATION DES PARAMETRES DES SECTIONS DE LIGNES DE PROPAGATION LINEAIRES, DES DIODES SCHOTTKY UTILISEES EN VARACTOR AINSI QUE LE NOMBRE DE SECTIONS NECESSAIRES EST EFFECTUE DE FACON SYSTEMATIQUE, EN FONCTION DU TYPE D'EXCITATION ET DU SIGNAL A OBTENIR EN SORTIE DU DISPOSITIF. NOUS AVONS TRAVAILLE EGALEMENT SUR LE PROBLEME DE LA SIMULATION DE L'EFFET DE PEAU ET DE LA DISPERSION MODALE DANS LE DOMAINE TEMPOREL DU FAIT DE L'IMPACT IMPORTANT DE CES DEUX PHENOMENES SUR L'EFFICACITE DE COMPRESSION DES LIGNES DE TRANSMISSION NON LINEAIRES. NOUS AVONS DEVELOPPE UNE METHODE PERMETTANT DE PRENDRE EN COMPTE LES PERTES PAR EFFET DE PEAU ET PAR RAYONNEMENT, AINSI QUE LA DISPERSION, DANS LES SIMULATIONS TEMPORELLES SOUS SPICE. CELA NOUS A PERMIS DE MONTRER DE FACON QUANTITATIVE L'INCIDENCE DES PERTES ET DE LA DISPERSION. NOUS AVONS AUSSI CONCU, REALISE ET TESTE UNE LIGNE DE TRANSMISSION NON LINEAIRE HYBRIDE FONCTIONNANT DANS LA BANDE S. LES RESULTATS DE MESURE DANS LE DOMAINE TEMPOREL MONTRENT QUE LA SINUSOIDE D'ENTREE EST FORTEMENT COMPRIMEE (365 PS 145 PS). DANS LE DOMAINE FREQUENTIEL, ON CONSTATE UNE GENERATION D'HARMONIQUES AVEC UNE TRES BONNE EFFICACITE DE CONVERSION (32% POUR L'HARMONIQUE DE RANG 2).
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
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.
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Book Synopsis UCRL. by : U.S. Atomic Energy Commission
Download or read book UCRL. written by U.S. Atomic Energy Commission and published by . This book was released on 19?? with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Boiling Water Reactor Plant by : United Engineers & Constructors, inc
Download or read book Boiling Water Reactor Plant written by United Engineers & Constructors, inc and published by . This book was released on 1972 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Organic Solid-State Lasers by : Sébastien Forget
Download or read book Organic Solid-State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
Book Synopsis Light Filaments by : Jean-Claude Diels
Download or read book Light Filaments written by Jean-Claude Diels and published by IET. This book was released on 2022 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume starts with tutorials about the science of filamentation before presenting in-depth chapters on the latest research, technologies and applications. It cover wide aspects of light filaments considering various mediums of propagation, with structured or single filaments, and filaments of different colours, as well as combined filaments. It also includes a wide range of applications from strong field ionisation and molecular properties to laser development and beam shaping, THz, lasing in air and supercontinuum generation.
Download or read book Properties of UO2 written by J. Belle and published by . This book was released on 1957 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Africa from the Sixteenth to the Eighteenth Century by : Bethwell A. Ogot
Download or read book Africa from the Sixteenth to the Eighteenth Century written by Bethwell A. Ogot and published by Univ of California Press. This book was released on 1992 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt: The result of years of work by scholars from all over the world, The UNESCO General History of Africa reflects how the different peoples of Africa view their civilizations and shows the historical relationships between the various parts of the continent. Historical connections with other continents demonstrate Africa's contribution to the development of human civilization. Each volume is lavishly illustrated and contains a comprehensive bibliography. This fifth volume of the acclaimed series covers the history of the continent from the beginning of the sixteenth century to the close of the eighteenth century in which two themes emerge: first, the continuing internal evolution of the states and cultures of Africa during this period second, the increasing involvement of Africa in external trade--with major but unforeseen consequences for the whole world. In North Africa, we see the Ottomans conquer Egypt. South of the Sahara, some of the larger, older states collapse, and new power bases emerge. Traditional religions continue to coexist with both Christianity (suffering setbacks) and Islam (in the ascendancy). Along the coast, particularly of West Africa, Europeans establish a trading network which, with the development of New World plantation agriculture, becomes the focus of the international slave trade. The immediate consequences of this trade for Africa are explored, and it is argued that the long-term global consequences include the foundation of the present world-economy with all its built-in inequalities.
Book Synopsis Conceptual Basis, Formalisations and Parameterization of the Stics Crop Model by : Nadine Brisson
Download or read book Conceptual Basis, Formalisations and Parameterization of the Stics Crop Model written by Nadine Brisson and published by Editions Quae. This book was released on 2009-01-19 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The STICS crop model has been developed since 1996 at INRA in collaboration with other research and technical institutes. The model syntheses, illustrates and concretizes an important part of the French agronomic knowledge as a point of view on the field and cropping systems working. The formalisations of the STICS crop model presented in this book can be considered as references used in the framework of crop sciences. The book arrangement relies on the way the model designs the crop-soil system functioning, each chapter being devoted to a set of important functions such as growth initiation, yield onset, water uptake, transformation of organic matter etc. One chapter deals with the cropping system and long term simulations and the final chapter is about the involvement of the user in terms of option choices and parameterization. If this book is mainly intended for scientists who use the STICS model, it can also be useful for agronomists, crop modellers, students and technicians looking for elementary formalizations of the crop-soil system functioning.
Book Synopsis Current Nuclear Power Plant Safety Issues by :
Download or read book Current Nuclear Power Plant Safety Issues written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Unesco. International Scientific Committee for the Drafting of a General History of Africa Publisher :Univ of California Press ISBN 13 :9780520067035 Total Pages :1076 pages Book Rating :4.0/5 (67 download)
Book Synopsis Africa Since 1935 by : Unesco. International Scientific Committee for the Drafting of a General History of Africa
Download or read book Africa Since 1935 written by Unesco. International Scientific Committee for the Drafting of a General History of Africa and published by Univ of California Press. This book was released on 1999 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hardcover edition of volume 8 was published in 1994. This paperback edition is the eighth and final volume to be published in the UNESCO General History of Africa. Volume 8 examines the period from 1935 to the present, and details the role of African states in the Second World War and the rise of postwar Africa. This is one of the most important books in the entire series, and as such, it is an unabridged paperback.
Book Synopsis UNESCO General History of Africa, Vol. I, Abridged Edition by : Jacqueline Ki-Zerbo
Download or read book UNESCO General History of Africa, Vol. I, Abridged Edition written by Jacqueline Ki-Zerbo and published by Univ of California Press. This book was released on 1990 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This volume covers the period from the end of the Neolithic era to the beginning of the seventh century of our era. This lengthy period includes the civilization of Ancient Egypt, the history of Nubia, Ethiopia, North Africa and the Sahara, as well as of the other regions of the continent and its islands."--Publisher's description
Book Synopsis Laser: 50 Years Of Discoveries by : Fabien Bretenaker
Download or read book Laser: 50 Years Of Discoveries written by Fabien Bretenaker and published by World Scientific. This book was released on 2014-10-27 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.
Author :Paul Gillaerts Publisher :Peter Lang Gmbh, Internationaler Verlag Der Wissenschaften ISBN 13 :9783034310925 Total Pages :0 pages Book Rating :4.3/5 (19 download)
Book Synopsis Researching Discourse in Business Genres by : Paul Gillaerts
Download or read book Researching Discourse in Business Genres written by Paul Gillaerts and published by Peter Lang Gmbh, Internationaler Verlag Der Wissenschaften. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contributions of this volume approach the genres of employee, CEO and organizational communication from different angles. They analyze how the author's position in the company influences the construction of these genres, what content and linguistic style characterize them, and how the discourse of these genres is related to other resources. They look at linguistic and rhetorical strategies in a range of communicative settings: email correspondence among (male versus female) co-workers, collaborative writing of formats in the workplace, leadership messaging by the CEO, financial disclosures for (non-)financial audiences and expressions of the corporate philosophy. Two methodologies in particular are prominent in the genre-based chapters: corpus analyses and case studies.
Book Synopsis Etude et conception de structures périodiques, type lignes de transmission non linéaires, pour des applications de multiplication de fréquences en bandes V by : Jean-Marc Duchamp
Download or read book Etude et conception de structures périodiques, type lignes de transmission non linéaires, pour des applications de multiplication de fréquences en bandes V written by Jean-Marc Duchamp and published by . This book was released on 2004 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'explosion des besoins en débits numériques des utilisateurs implique la mise en œuvre de techniques d'interconnexion de réseaux performantes. Les besoins de bande passante, à coût faible, nécessitent l'étude de nouveaux dispositifs de communication sans fils à des fréquences de plus en plus élevées. La bande de fréquences, dite bande V est une plage fréquentielle encore libre et qui présente l'avantage de limiter la propagation hertzienne à quelques centaines de mètres ce qui est bien adapté aux liaisons dites du "dernier kilomètre". La génération de fréquences au-delà de quelques dizaines de GHz, est basée sur l'utilisation de composants électroniques à résistance négative. L'inconvénient principal de cette solution est que la puissance générée diminue rapidement lorsque la fréquence de fonctionnement augmente. La solution alternative envisagée repose sur l'association d'un oscillateur et d'un multiplieur de fréquences micro-onde. La multiplication est obtenue grâce à des varactors. Leur association en réseaux périodiques concentre la puissance transmisse quelques fréquences. L'apparition de nouveaux varactors "symétriques" : les varactors hétéro structures (HBV) nécessitent une nouvelle approche des critères de choix des non-linéarités. Les performances fréquentielles de la structure de propagation sur laquelle seront répartis les varactors ont également fait l'objet d'une analyse. L'étude comparative des coefficients de propagation pour une ligne micro ruban, un guide d'onde coplanaire et une Fin-line a permis de mettre en évidence les avantages et inconvénients de chacune de ces structures autour de 60 GHz. Les définitions de nouveaux modèles électriques permettant la prise en compte des différentes pertes dans les structures périodiques ont pu être validé par des réalisations. L'étude de la répartition de la non-linéarité le long de la structure de propagation a également démontré l'intérêt des structures périodiques. L'ensemble des ces résultats a conduit à la définition d'une topologie de ligne de propagation non linéaire optimale qui multiplie une fréquence de 20 GHz par trois. Cette ligne repose sur une structure de guide d'onde co-planaire chargée périodiquement par des HBV avec un rendement de puissance de 2Q% pour une bande passante de plus de 30 %
Book Synopsis Réponse non-linéaire de super-réseaux et quasi-réseaux Josephson by : Denis Barday
Download or read book Réponse non-linéaire de super-réseaux et quasi-réseaux Josephson written by Denis Barday and published by . This book was released on 1990 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous étudions la réponse non-linéaire en transmission de divers dispositifs Josephson. En premier lieu, nous étudions expérimentalement la réponse non linéaire d'une jonction Josephson courte par simulation analogique au moyen d'un circuit électronique a bouclage de phase de type P.L.L. et notamment la réponse a une excitation extérieure d'une jonction avec un courant Josephson du type sine-Gordon généralise, physiquement plus proche que le potentiel sinusoïdal du modèle initial. La propagation des solitons enveloppe dans les jonctions Josephson longues, ou lignes de transmission Josephson est alors étudiée théoriquement et par simulation numérique. Dans l'approximation des milieux continus et la limite des faibles amplitudes, les équations caractéristiques de ce type de ligne se ramènent à l'équation de Schrödinger non linéaire (NLS). La solution a deux solitons enveloppe se propage parfaitement avec des phénomènes de récurrence et de compression d'enveloppe. Ceci est observe également pour des profils d'excitation non solution de NLS, ce qui est d'un grand intérêt pour les applications pratiques comme la compression d'impulsions. Nous examinons ensuite la dépendance en amplitude des propriétés de transmission dans la bande linéairement interdite naturelle (gap) d'une ligne de transmission Josephson (LTJ) et dans la bande lineairement interdite artificielle d'un super-réseau Josephson (SRJ). Nous montrons que la réponse en transmission de ces deux systèmes présente de l'hystérésis et de la bi stabilité due à la formation d'ondes stationnaires non linéaires appelées solitons de gap. La transmission à travers de tels systèmes peut être totale si l'amplitude de l'onde incidente est supérieure à un certain seuil dépendant de la fréquence et de la longueur du dispositif. Nos expériences numériques sur la dynamique des ondes dans de tels systèmes, correspondant au comportement physique réel de la ligne, sont en bon accord avec nos calculs théoriques...
