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Etude Numerique De La Relaxation Dun Cristal Liquide Nematique
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Book Synopsis Étude numérique de la relaxation d'un cristal liquide nématique by : Matthieu Kocher
Download or read book Étude numérique de la relaxation d'un cristal liquide nématique written by Matthieu Kocher and published by . This book was released on 1978 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE L'INFLUENCE D'UN PHENOMENE DE DISSIPATION A LA PAROI SUR LA RELAXATION D'UNE CELLULE DE CNL FAIBLEMENT ANCREE SUR DEUX PLAQUES PLANES PARALLELES. MISE EN EVIDENCE DE L'INFLUENCE DE LA VISCOSITE DE PAROI. LA SIMULATION NUMERIQUE DONNE UNE REPRESENTATION DE L'ETAT DE DISTORSION AU COURS DE LA RELAXATION.
Book Synopsis TRANSITION ET SEPARATION DE PHASE DANS LES SYSTEMES CRISTAUX LIQUIDES by : Yves Lansac
Download or read book TRANSITION ET SEPARATION DE PHASE DANS LES SYSTEMES CRISTAUX LIQUIDES written by Yves Lansac and published by . This book was released on 1993 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE CONCERNE L'ETUDE DE LA DYNAMIQUE DES TRANSITIONS ET SEPARATIONS DE PHASE DANS DES CORPS PURS CRISTAUX LIQUIDES (CHAINES DE POLYMERE SEMI-RIGIDE DE DEGRE DE POLYMERISATION N ET DE LONGUEUR DE PERSISTANCE Q OU PETITES MOLECULES) ET DES MELANGES BINAIRES DONT L'UN DES CONSTITUANTS PEUT ETRE MESOMORPHE. DANS LA PREMIERE PARTIE, NOUS DERIVONS UNE ENERGIE LIBRE TRES GENERALE, A PARTIR D'UN FORMALISME BASE SUR LES INTEGRALES FONCTIONNELLES. CETTE ENERGIE LIBRE TIENT COMPTE DE PLUS DES INHOMOGENEITES SPATIALES DU MILIEU PAR L'INTRODUCTION DE TERMES DE VARIATIONS SPATIALES DES PARAMETRES D'ORDRE DU SYSTEME, A SAVOIR LES CONCENTRATIONS VOLUMIQUES DE CHAQUE CONSTITUANT ET LES ORIENTATIONS MOYENNES DES MOLECULES DE CRISTAUX LIQUIDES PAR RAPPORT A UN DIRECTEUR FIXE, UNIQUE DANS LE MILIEU. NOUS ETUDIONS ENSUITE LES POINTS D'EQUILIBRE EN FONCTION DES PARAMETRES PERTINENTS DES DIFFERENTS SYSTEMES ENVISAGES AINSI QUE LEURS EVOLUTIONS DYNAMIQUES, GOUVERNEES PAR DES EQUATIONS AUX DERIVEES PARTIELLES NON LINEAIRES, DE TYPE CAHN-HILLIARD DANS LE CAS D'UN MELANGE NON MESOMORPHE POUR LEQUEL LE PARAMETRE D'ORDRE (CONCENTRATION) EST CONSERVATIF, DE TYPE GINZBURG-LANDAU REEL POUR UN CORPS PUR CRISTAL LIQUIDE NEMATIQUE DONT LE PARAMETRE D'ORDRE ORIENTATIONNEL MOYEN EST NON CONSERVATIF ET PAR UN COUPLAGE DE CES DEUX EQUATIONS DANS LE CAS D'UN MELANGE DONT L'UN DES COMPOSANTS EST MESOMORPHE. DU FAIT DES NON-LINEARITES PRESENTES, CES EQUATIONS SONT SIMULEES NUMERIQUEMENT A 2 D, A L'AIDE D'UN CALCULATEUR MASSIVEMENT PARALLELE (CONNECTION MACHINE CM 200 A L'INRIA SOPHIA-ANTIPOLIS). LES DIFFERENTES STRUCTURES APPARAISSANT LORS DES PROCESSUS DYNAMIQUES EN FONCTION DES PARAMETRES PERTINENTS SONT VISUALISES ET LEURS LOIS D'EVOLUTION SONT DONNEES. DANS LA DERNIERE PARTIE, NOUS ETUDIONS, TOUJOURS A L'AIDE DE SIMULATION NUMERIQUE, LA TRANSITION DE PHASE DANS DES CORPS PURS THERMOTROPES, NEMATIQUES OU CHOLESTERIQUES, EN TENANT COMPTE DES VARIATIONS SPATIALES DU DIRECTEUR. LES EQUATIONS DYNAMIQUES SONT DE TYPE GINZBURG-LANDAU POUR UN PARAMETRE D'ORDRE TENSORIEL ET NOUS VISUALISONS LA TRANSITION DE PHASE AINSI QUE LES DEFAUTS CARACTERISTIQUES DE CE TYPE DE MATERIAUX
Book Synopsis Rentrance sous pression dans les cristaux liquides by : Abdelkader Anakkar
Download or read book Rentrance sous pression dans les cristaux liquides written by Abdelkader Anakkar and published by . This book was released on 1990 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Un développement à l'ordre trois en fonction de la température et de la pression de la différence d'énergie de Gibbs entre deux phases successives est proposé pour rendre compte et prévoir les diagrammes de phase pression-température de cristaux liquides présentant des phénomènes de double rentrance. Pour l'étude expérimentale de ces comportements originaux, parmi les différentes méthodes d'analyse des transitions de phase des mésogènes sous pression, seule la méthode piézothermique convient. Elle consiste à mesurer la chaleur dégagée ou absorbée à la suite d'une variation de pression par un échantillon enfermé dans une cellule haute pression dans des conditions isothermes. Un nouveau microcalorimètre à flux thermique à couches composites, utilisant de faibles quantités de produit et fonctionnant entre -100°C et +300°C pour des pressions allant jusqu'à 7000 bars a été mis au point. Les performances du nouveau montage ont été déterminées. L'étude sur 10 mm3 d'un cristal liquide, p-octylbenzoate de p-cyanobenzoyloxyphényle, présentant une transition nématique rentrant - smectique Ad a été entreprise pour deux isothermes. Les courbes donnant le coefficient de dilatation thermique isobare en fonction de la pression montrent une nette anomalie à la transition qui diminue lorsque la température augmente. Bien que l'analyse enthalpique différentielle ne détecte pas cette transformation, les études piézothermiques montrent que cette transition n'est pas purement du second ordre, mais peut être qualifiée de très faiblement du premier ordre. La portion du diagramme de phase Pression-Température correspondant à cette transition a été déterminée.
Download or read book Journal de physique written by and published by . This book was released on 1985 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Papers on Polarization by : Bruce H. Billings
Download or read book Selected Papers on Polarization written by Bruce H. Billings and published by . This book was released on 1990 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Convection in Liquids by : J.K. Platten
Download or read book Convection in Liquids written by J.K. Platten and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: Both of the authors of this book are disciples and collaborators of the Brussels school of thermodynamics. Their particular domain of competence is the application of numerical methods to the many highly nonlinear problems which have arisen in the context of recent developments in the thermodynamics of irreversi ble processes: stability of states far from equilibrium, search for marginal critical states, bifwrcation phenomena, multiple stationnary states, dissipative structures, etc. These problems cannot in general be handled using only the clas sical and mathematically rigorous methods of the theory of differential, partial differential, and int~grodifferential equations. The present authors demonstrate how approximate methods, re lyi ng usually on powerful computers, lead to significant progress in these areas, if one is prepa red to accept a certain lack of rigor, such as, for example, the lack of proof for the convergence of the series used in the context of problems which are not self adjoint, nor even linear. The results thus obtained must consequently be submit ted to an exacting confrontation with experimental observations. - Even though, the '1 imited information obtained concerning the, often unsuspec ted, mechanisms underlying the observed phenomena is both precious and frequently sufficient. This information results from the properties of the trial functions best suited to the constraints of the problem such as the initial, boundary, and "feedback" conditions, and the analysis of their behavior in the course of the evolution of the system.
Download or read book Dew Water written by Daniel Beysens and published by CRC Press. This book was released on 2022-09-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world’s ever-increasing need for fresh water has led to the use of non-conventional sources such as rain and fog water collection. Although rain water collection is relatively simple, the supply is often erratic. Passive fog water collection has been used in several parts of the world but is only relevant to certain geographical locations. Dew occurrence, however, is far more widespread, can form in most climates and geographic settings, show high frequency and prevalence throughout the year. During the past 20 years, dew collection has therefore been investigated as a serious supplemental source of fresh water. Dew Water offers a thorough review of dew, its formation characteristics and potential for dew collection, for audiences that include policy-makers, non-governmental organizations involved in development aid and sustainable development, engineers, urban planners, researchers and students.After providing a background on atmospheric water, humid air, and sky and materials emissivity, the book deals with dew formation and its estimation with a focus on the use of meteorological data. Dew measurement techniques are reviewed and discussed as well as dew collection by passive means. Computational fluid dynamics technique is described for better design of dew collectors. Dew quality (chemistry, biology) is assessed in view of potable water quality. Costs and economic aspects are also considered.
Book Synopsis Developments in Heat Transfer by : Warren M. Rohsenow
Download or read book Developments in Heat Transfer written by Warren M. Rohsenow and published by MIT Press (MA). This book was released on 1964 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Essay on Dew and Several Appearances Connected with it by : William Charles Wells
Download or read book An Essay on Dew and Several Appearances Connected with it written by William Charles Wells and published by . This book was released on 1866 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Magnetoelectric Interaction Phenomena in Crystals by : Manfred Fiebig
Download or read book Magnetoelectric Interaction Phenomena in Crystals written by Manfred Fiebig and published by Springer Science & Business Media. This book was released on 2013-11-09 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the quest for higher data density in information technology manipulation of magnetization by other means than magnetic fields has become an important challenge. This lead to a startling revival of the magnetoelectric effect, which characterizes induction of a polarization by a magnetic field or of a magnetization by an electric field. The magnetoelectric crosslink of material properties opens just those degrees of freedom which are needed for the mutual control of magnetic and electric states. The book gives a state-of-the-art review on magnetoelectrics research, classifies current research tendencies, and points out possible future trends. Novel compounds and growth techniques and new theoretical concepts for the understanding of magnetoelectric coupling phenomena are introduced. Highlights are the discovery of "gigantic" magnetoelectric effects which are strong enough to trigger electric or magnetic phase transitions; the concept of magnetochirality; and development "structural" magnetoelectric effects in artificial multiphase compounds. The book is addressed to condensed-matter physicists with a particular focus on experts in highly correlated systems.
Book Synopsis Marketing in Zambia by : Reginald Biddle
Download or read book Marketing in Zambia written by Reginald Biddle and published by . This book was released on 1985 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Elements of Transport Phenomena by : Leighton E. Sissom
Download or read book Elements of Transport Phenomena written by Leighton E. Sissom and published by McGraw-Hill Companies. This book was released on 1972 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modern Aspects of Small-Angle Scattering by : H. Brumberger
Download or read book Modern Aspects of Small-Angle Scattering written by H. Brumberger and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, Como, Italy, May 12--22, 1993
Book Synopsis Making the Most of Your Presentation by :
Download or read book Making the Most of Your Presentation written by and published by . This book was released on 2000 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unidentified written by Robert Salas and published by Career Press. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1969 the U.S. Air Force issued a statement that read' "No UFO reported, investigated and evaluated by the Air Force was ever an indication of threat to our national security." This statement is patently false. It has been proven untrue by the testimony of many military officers and airmen and documentation of incidents involving UFOs and nuclear weapons, testimonies of which the U.S. Air Force was fully aware. Unidentified details many of these testimonies, some for the first time. As partial justification for its position, the Air Force cites a University of Colorado study that was contracted and paid for by federal funds. Unidentified reveals how this study was actually just another part of the plan to cover up the reality of the UFO phenomenon. For the first time, Unidentified publishes evidence that the investigators for the Colorado study knew about the UFO-related missile shutdown incidents but did not investigate them or include them in their final report.
Author :Richard A. Dudley Publisher :SPIE-International Society for Optical Engineering ISBN 13 :9781510602151 Total Pages : pages Book Rating :4.6/5 (21 download)
Book Synopsis Engineered Materials and Metamaterials by : Richard A. Dudley
Download or read book Engineered Materials and Metamaterials written by Richard A. Dudley and published by SPIE-International Society for Optical Engineering. This book was released on 2016-06-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The field of metamaterials arose from a deeper understanding of how electromagnetic waves interact with materials and subwavelength-scaled scattering structures. This opened up the field of metamaterials or engineered materials through advances in understanding how material properties not found in nature could be designed along with advances in fabrication capabilities. Metamaterial advances span the electromagnetic spectrum, with examples being more common at lower (e.g., microwave) frequencies. The microwave or x-band regime has proven to be a good testbed for the first generation of metamaterials, but recently we have seen optical and IR metamaterials emerging as well. The exploitation of these more complex material-wave interactions, based on arrangements of subwavelength scale components, has generated a lot of global activity. We can, in principle, engineer material properties to greatly extend those currently available. This tutorial text presents both the usual and unusual electromagnetic properties of materials, focusing especially man-made or engineered metamaterials. After a review of Maxwell's equations and material properties, the idea of resonant meta-atoms and composite media are introduced. The fabrication of metamaterials and the properties of negative index materials are explained. The difficulties associated with reducing the size of meta-atoms for use at optical frequencies are described, and the use of metamaterials for superresolution imaging is presented in some detail"--
Book Synopsis Lost Secrets of the Sacred Ark by : Laurence Gardner
Download or read book Lost Secrets of the Sacred Ark written by Laurence Gardner and published by HarperCollins UK. This book was released on 2004 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ark of the Covenant is the source of one of the deepest mysteries of the Western world. Laurence Gardner has accessed Rosicrucian archives to reveal where the Ark is, what it is and how this lost secret of the distant past has led to the phenomenal new science of space-time manipulation.
