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Author: ERIC.. BLUEM
Publisher:
ISBN:
Category :
Languages : fr
Pages : 284
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Book Description
LE SUJET DE CE MEMOIRE PORTE A LA FOIS SUR LA PROPAGATION D'ONDE ET LA CARACTERISATION EXPERIMENTALE D'UN PLASMA MICROONDE, EXICTE A 2450 MHZ, DE GRAND DIAMETRE 120 MM. LES GAZ UTILISES SONT L'ARGON ET L'OXYGENE AVEC DES PRESSIONS DE L'ORDRE DU TORR. LE CHAPITRE I EST CONSACRE A UN RAPPEL DES RESULTATS REMARQUABLES CONCERNANT LES DECHARGES EN ONDES DE SURFACE DE PLUS PETIT DIAMETRE ETUDIEES JUSQU'ICI (PROPAGATION DES ONDES, MAINTIEN DE LA DECHARGE, DENSITE ELECTRONIQUE ET CARACTERISTIQUES DE LA DECHARGE). LES CHAPITRES SUIVANTS SONT CONSACRES A L'ETUDE DU PLASMA MICROONDE DE GRAND DIAMETRE. APRES AVOIR DETAILLE LA RESOLUTION DE L'EQUATION DE DISPERSION DES DIFFERENTS MODES POUVANT SE PROPAGER DANS UNE STRUCTURE CYLINDRIQUE A 3 MILIEUX, NOUS PRESENTONS LE MONTAGE EXPERIMENTAL, LES CONDITIONS D'ETUDES, PUIS LES DIFFERENTS DIAGNOSTICS NON INTRUSIFS UTILISES ANTENNE ELECTRIQUE, BOUCLE MAGNETIQUE, BANC INTERFEROMETRIQUE, SPECTROSCOPIE D'EMISSION POUR CARACTERISER AU MIEUX LA DECHARGE DANS LES TROIS DIRECTIONS: LONGITUDINALE, RADIALE ET AZIMUTALE. NOUS EFFECTUONS ALORS UN BILAN DES DIFFERENTS RESULTATS OBTENUS DANS LA DECHARGE. POUR DES PUISSANCES MICROONDES DE L'ORDRE DE 1 KW, LES LONGUEURS DE PLASMA S'ETALENT DE 15 CM EN OXYGENE PUR A 1.3 M EN ARGON PUR. LES DENSITES ELECTRONIQUES SONT DE L'ORDRE DE 10#1#2 CM#-#3. D'APRES L'ETUDE THEORIQUE, L'ENTRETIEN DE LA DECHARGE EST EFFECTUE PAR UN OU PLUSIEURS MODES PLASMA. DES MESURES LONGITUDINALES QUI PRESENTENT DES MODULATIONS, IL RESSORT UN PHENOMENE DE BATTEMENT D'ONDES DU A UNE PROPAGATION MULTIMODE DE LA DECHARGE. SEULE LA PRESENCE DU MODE PLASMA MAJORITAIRE, LE MODE HEXAPOLAIRE, EST ALORS CLAIREMENT MISE EN EVIDENCE PAR LES MESURES AZIMUTALES ET LES ETATS EXCITES REFLETENT DIRECTEMENT LA CONFIGURATION DU CHAMP ELECTROMAGNETIQUE. PAR CONTRE, LES DENSITES D'OXYGENE ATOMIQUE NEUTRE DE LA DECHARGE, DE L'ORDRE DE 1%, ONT UN PROFIL HOMOGENE DANS LES 3 DIRECTIONS SPATIALES
Author: ERIC.. BLUEM
Publisher:
ISBN:
Category :
Languages : fr
Pages : 284
Get Book Here
Book Description
LE SUJET DE CE MEMOIRE PORTE A LA FOIS SUR LA PROPAGATION D'ONDE ET LA CARACTERISATION EXPERIMENTALE D'UN PLASMA MICROONDE, EXICTE A 2450 MHZ, DE GRAND DIAMETRE 120 MM. LES GAZ UTILISES SONT L'ARGON ET L'OXYGENE AVEC DES PRESSIONS DE L'ORDRE DU TORR. LE CHAPITRE I EST CONSACRE A UN RAPPEL DES RESULTATS REMARQUABLES CONCERNANT LES DECHARGES EN ONDES DE SURFACE DE PLUS PETIT DIAMETRE ETUDIEES JUSQU'ICI (PROPAGATION DES ONDES, MAINTIEN DE LA DECHARGE, DENSITE ELECTRONIQUE ET CARACTERISTIQUES DE LA DECHARGE). LES CHAPITRES SUIVANTS SONT CONSACRES A L'ETUDE DU PLASMA MICROONDE DE GRAND DIAMETRE. APRES AVOIR DETAILLE LA RESOLUTION DE L'EQUATION DE DISPERSION DES DIFFERENTS MODES POUVANT SE PROPAGER DANS UNE STRUCTURE CYLINDRIQUE A 3 MILIEUX, NOUS PRESENTONS LE MONTAGE EXPERIMENTAL, LES CONDITIONS D'ETUDES, PUIS LES DIFFERENTS DIAGNOSTICS NON INTRUSIFS UTILISES ANTENNE ELECTRIQUE, BOUCLE MAGNETIQUE, BANC INTERFEROMETRIQUE, SPECTROSCOPIE D'EMISSION POUR CARACTERISER AU MIEUX LA DECHARGE DANS LES TROIS DIRECTIONS: LONGITUDINALE, RADIALE ET AZIMUTALE. NOUS EFFECTUONS ALORS UN BILAN DES DIFFERENTS RESULTATS OBTENUS DANS LA DECHARGE. POUR DES PUISSANCES MICROONDES DE L'ORDRE DE 1 KW, LES LONGUEURS DE PLASMA S'ETALENT DE 15 CM EN OXYGENE PUR A 1.3 M EN ARGON PUR. LES DENSITES ELECTRONIQUES SONT DE L'ORDRE DE 10#1#2 CM#-#3. D'APRES L'ETUDE THEORIQUE, L'ENTRETIEN DE LA DECHARGE EST EFFECTUE PAR UN OU PLUSIEURS MODES PLASMA. DES MESURES LONGITUDINALES QUI PRESENTENT DES MODULATIONS, IL RESSORT UN PHENOMENE DE BATTEMENT D'ONDES DU A UNE PROPAGATION MULTIMODE DE LA DECHARGE. SEULE LA PRESENCE DU MODE PLASMA MAJORITAIRE, LE MODE HEXAPOLAIRE, EST ALORS CLAIREMENT MISE EN EVIDENCE PAR LES MESURES AZIMUTALES ET LES ETATS EXCITES REFLETENT DIRECTEMENT LA CONFIGURATION DU CHAMP ELECTROMAGNETIQUE. PAR CONTRE, LES DENSITES D'OXYGENE ATOMIQUE NEUTRE DE LA DECHARGE, DE L'ORDRE DE 1%, ONT UN PROFIL HOMOGENE DANS LES 3 DIRECTIONS SPATIALES
Author: Valerio Bozza
Publisher: Springer
ISBN: 3319274589
Category : Science
Languages : en
Pages : 262
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Book Description
In this book, renowned scientists describe the various techniques used to detect and characterize extrasolar planets, or exoplanets, with a view to unveiling the “tricks of the trade” of planet detection to a wider community. The radial velocity method, transit method, microlensing method, and direct imaging method are all clearly explained, drawing attention to their advantages and limitations and highlighting the complementary roles that they can play in improving the characterization of exoplanets’ physical and orbital properties. By probing the planetary frequency at different distances and in different conditions, these techniques are helping astrophysicists to reconstruct the scenarios of planetary formation and to give robust scientific answers to questions regarding the frequency of potentially habitable worlds. Twenty years have passed since the discovery of a Jupiter-mass companion to a main sequence star other than the Sun, heralding the birth of extrasolar planetary research; this book fully conveys the exciting progress that has been achieved during the intervening period.
Author: International Livestock Research Institute
Publisher: ILRI (aka ILCA and ILRAD)
ISBN: 9789291460038
Category : Animal industry
Languages : en
Pages : 268
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Book Description
Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.
Author: Michael A. Blake
Publisher: Springer Science & Business Media
ISBN: 1597455601
Category : Medical
Languages : en
Pages : 229
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Book Description
Imaging of the adrenal gland has made tremendous progress in the last decade as new technologies continue to evolve. Adrenal Imaging highlights the pertinent clinical and pathological information that underpins the accurate interpretation and use of adrenal imaging. Written by a prestigious group of international contributors, individual chapters in Adrenal Imaging serve as a relevant and up-to-date reference of adrenal imaging findings, algorithms and techniques in CT, MR nuclear medicine, intervention and trauma. Summary sections at the end of each chapter illuminate key teaching points to enhance retention.
Author: Alexandre Koyre
Publisher: Routledge
ISBN: 1135028346
Category : Philosophy
Languages : en
Pages : 520
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Book Description
Originally published in English in 1973. This volume traces the development of the revolution which so drastically altered man’s view of the universe in the sixteenth and seventeenth centuries. The "astronomical revolution" was accomplished in three stages, each linked with the work of one man. With Copernicus, the sun became the centre of the universe. With Kepler, celestial dynamics replaced the kinematics of circles and spheres used by Copernicus. With Borelli the unification of celestial and terrestrial physics was completed by abandonment of the circle in favour the straight line to infinity.
Author: Goddard Space Flight Center. Office of Public Affairs
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 366
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Book Description
Author: Vasilios Lykousis
Publisher: Springer Science & Business Media
ISBN: 1402065124
Category : Science
Languages : en
Pages : 407
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Book Description
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.
Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author: Émilie du Châtelet
Publisher:
ISBN: 9781693596483
Category :
Languages : en
Pages : 58
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Book Description
The amazing scientist, mathematician, philosopher Émilie du Châtelet (1706-49) has widely been hailed as a rare female intellectual in the Enlightenment. At the same time, her own ideas and contributions remain largely unknown and her writings are rarely read. This is unfortunate, since she has interesting contributions to and explanations of physics, metaphysics, religion, translation, the equality of the sexes, and ethics.This book is a selection of du Châtelet's philosophical writings, in new English translations: -Foreword to "Foundations of Physics"-On the Principles of Our Knowledge (From "Foundations of Physics")-On the Existence of God (From "Foundations of Physics")-On Liberty-Translator's Preface to Mandeville's "Fable of the Bees"-On the Resurrection of the Dead (from "Examinations of the Bible")-On Happiness
Author: Aditya Johri
Publisher: Cambridge University Press
ISBN: 1107785855
Category : Technology & Engineering
Languages : en
Pages : 1124
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Book Description
The Cambridge Handbook of Engineering Education Research is the critical reference source for the growing field of engineering education research, featuring the work of world luminaries writing to define and inform this emerging field. The Handbook draws extensively on contemporary research in the learning sciences, examining how technology affects learners and learning environments, and the role of social context in learning. Since a landmark issue of the Journal of Engineering Education (2005), in which senior scholars argued for a stronger theoretical and empirically driven agenda, engineering education has quickly emerged as a research-driven field increasing in both theoretical and empirical work drawing on many social science disciplines, disciplinary engineering knowledge, and computing. The Handbook is based on the research agenda from a series of interdisciplinary colloquia funded by the US National Science Foundation and published in the Journal of Engineering Education in October 2006.
