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De Quelques Proprietes Des Nouvelles Phases De Cristaux Liquides Antiferroelectriques
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Book Synopsis DE QUELQUES PROPRIETES DES NOUVELLES PHASES DE CRISTAUX LIQUIDES ANTIFERROELECTRIQUES by : PATRICK.. GISSE
Download or read book DE QUELQUES PROPRIETES DES NOUVELLES PHASES DE CRISTAUX LIQUIDES ANTIFERROELECTRIQUES written by PATRICK.. GISSE and published by . This book was released on 1994 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE ETUDE EXPERIMENTALE A ETE REALISEE AUTOUR DES TRANSITIONS ENTRE LES PHASES SMECTIQUES FERROELECTRIQUE, FERRIELECTRIQUE ET ANTIFERROELECTRIQUE DE DEUX COMPOSES D'UNE NOUVELLE FAMILLE DE CRISTAUX LIQUIDES ANTIFERROELECTRIQUES. DES MESURES DE DIFFRACTION DES RAYONS X SUR DES POUDRES OU DES MONODOMAINES, AINSI QUE LES VARIATIONS D'ANGLES DE TILT EN FONCTION DE LA TEMPERATURE NOUS ONT PERMIS DE METTRE EN EVIDENCE LA POSSIBILITE D'EXISTENCE POUR LA PHASE FERRIELECTRIQUE, D'UNE STRUCTURE SMECTIQUE BICOUCHE A MEME ANGLE DE TILT ET A ANGLE AZIMUTAL COMPRIS ENTRE 0 ET . DES MESURES DIELECTRIQUES ONT EGALEMENT ETE EFFECTUEES DANS DIFFERENTES CONDITIONS, SOIT D'EPAISSEURS D'ECHANTILLONS, SOIT EN PRESENCE D'UN CHAMP ELECTRIQUE EXTERNE. ELLES SONT INTERPRETEES DANS LE CADRE D'UN DEVELOPPEMENT PHENOMENOLOGIQUE A LA LANDAU. SONT ENFIN INCLUSES, LES ETUDES DU COMPORTEMENT DES DEFAUTS STRUCTURAUX DE TYPE LIGNES DE DECHIRALISATION DANS DES ECHANTILLONS EN GEOMETRIE CONTROLEE, LORS DU PROCESSUS DE DEROULEMENT DE LA STRUCTURE HELICOIDALE PAR APPLICATION D'UN CHAMP ELECTRIQUE EXTERNE. UNE ANALYSE DE L'ENERGIE D'ANCRAGE DES MOLECULES AUX SURFACES NOUS PERMET DE COMPRENDRE COMMENT CES DEFAUTS PEUVENT SE REALISER
Book Synopsis Etude des propriétés électriques et optiques de cristaux liquides présentant des phases smectiques chirales et les phases frustrées SmQ et L by : Mounir Manai
Download or read book Etude des propriétés électriques et optiques de cristaux liquides présentant des phases smectiques chirales et les phases frustrées SmQ et L written by Mounir Manai and published by . This book was released on 2006 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans une première partie de ce travail, nous avons étudié l'effet de la longueur de la chaîne alcoxyle et la position du fluor sur les propriétés physiques et sur la séquence des phases d'une nouvelle série monofluorée de CL. Les résultats montrent que la phase SmC*a est déstabilisée, une augmentation de la plage d'existence de la phase SmC*a pour les chaînes de longueurs moyennes alors que pour les courtes chaînes seule la phase SmA est présente. Par ailleurs, l'étude du comportement du mode mou à basse fréquence combiné avec les résultats électriques et optiques nous ont permis d'établir le diagramme de phase (E, T) d'un composé choisi. Ce qui nous a permis de situer les phases de base et celles induites par le champ et de mieux interpréter le nombre de pics obtenu dans les expériences d'électro-optique. Dans une deuxième partie, nous avons étudié des composés présentant une haute chiralité et des molécules suffisamment allongées qui conduisent, la plus part du temps aux deux phases L et SmQ ou bien la phase SmC*a. La phase L est isotrope et présente un ordre chiral et smectique de courte portée et elle est dotée de PRO alors que la phase SmQ n'en présente pas à cause de son caractère uniaxe. Dans la phase SmC*a, les propriétés électro-optiques de la phase ferroélectrique induite sont de type super-paraélectrique déjà décrit dans les composés bananes. Dans une dernière partie, nous avons étudié la propagation de la lumière le long de l'axe hélicoïdal dans les phases SmC* et SmC*A. La décomposition du tenseur diélectrique dans une nouvelle base tensorielle nous a permis de retrouver les deux modes de propagation
Book Synopsis CONTRIBUTION A L'ETUDE DES PROPRIETES ELECTRIQUES DE CRISTAUX LIQUIDES ANTIFERROELECTRIQUES by : REDOUANE.. DOUALI
Download or read book CONTRIBUTION A L'ETUDE DES PROPRIETES ELECTRIQUES DE CRISTAUX LIQUIDES ANTIFERROELECTRIQUES written by REDOUANE.. DOUALI and published by . This book was released on 2000 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES CRISTAUX LIQUIDES SONT CONNUS POUR LEURS PROPRIETES OPTIQUES ET ELECTRIQUES PARTICULIERES (BIREFRINGENCE ET COMMANDE PAR CHAMP ELECTRIQUE). DE NOS JOURS, ILS SONT LARGEMENT UTILISES DANS LES DISPOSITIFS DE VISUALISATION. CE TRAVAIL CONCERNE L'ETUDE DES PROPRIETES ELECTRIQUES DE CRISTAUX LIQUIDES ANTIFERROELECTRIQUES ADAPTES AU DEVELOPPEMENT D'AFFICHEURS RAPIDES ET TRISTABLES. DEUX COMPOSES D'UNE MEME SERIE PRESENTANT LA SEQUENCE DE PHASES C-S* C A-S* C F I I-S* C F I 2-S* C-S* C -S A-I ONT ETE CARACTERISES A L'AIDE DE TROIS TECHNIQUES DEVELOPPEES AU LABORATOIRE : LA SPECTROSCOPIE DIELECTRIQUE A LARGES GAMMES DE FREQUENCE ET DE TEMPERATURE, LES MESURES DE POLARISATION ET DE BRUIT BASSE FREQUENCE. L'ETUDE DIELECTRIQUE PERMET DE DETECTER LES TRANSITIONS DE PHASES S A-S* C ET S* C -S* C. SANS CHAMP ELECTRIQUE CONTINU, UN MECANISME DE RELAXATION LIE A L'HELICITE DE LA PHASE S* C EST OBSERVE. CE MECANISME EST FORTEMENT MODIFIE PAR L'APPLICATION D'UN CHAMP CONTINU QUI INDUIT LE DEROULEMENT DE CETTE PHASE. DES COMPORTEMENTS DIFFERENTS POUR LES DEUX COMPOSES SONT MIS EN EVIDENCE EN FONCTION DE LA TEMPERATURE ET DE LA TENSION CONTINUE. L'ANALYSE DES SPECTRES DIELECTRIQUES DANS LES PHASES S* C A ET S* C F I MONTRE L'EXISTENCE DE PLUSIEURS MECANISMES DE RELAXATION. LEUR ORIGINE EST DISCUTEE A PARTIR DES MODELES STRUCTURAUX DE CES PHASES CONSIDERANT DES CELLULES DE BASE A DEUX, TROIS ET QUATRE COUCHES. UN BRUIT BASSE FREQUENCE ATTRIBUE A DES FLUCTUATIONS DE LA POLARISATION EST MIS EN EVIDENCE DANS LES PHASES S A, S* C ET S* C. LA CORRELATION AVEC LES PERTES MONTRE QUE LES MESURES DIELECTRIQUES S'EFFECTUENT EN REGIME LINEAIRE ET QUE CE BRUIT EST D'ORIGINE THERMIQUE. UNE ETUDE THEORIQUE DES PROPRIETES DIELECTRIQUES DE LA PHASE S*
Book Synopsis Etude structurale et propriétés électriques de cristaux liquides smectiques à torsion par joints de grain (TGB) by : Myriam Petit
Download or read book Etude structurale et propriétés électriques de cristaux liquides smectiques à torsion par joints de grain (TGB) written by Myriam Petit and published by . This book was released on 1997 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: SUITE A L'ANALOGIE ETABLIE ENTRE LES SUPRACONDUCTEURS ET LES CRISTAUX LIQUIDES SMECTIQUES A (DE GENNES, MC MILLAN 1972), LA PHASE SMECTIQUE A TORSION PAR JOINTS DE GRAIN (TGB) DANS LES CRISTAUX LIQUIDES EST PROPOSEE (RENN, LUBENSKY 1988) COMME L'ANALOGUE DE LA PHASE A RESEAUX DE FLUX D'ABRIKOSOV DANS LES SUPRACONDUCTEURS DE TYPE II. LES PREMIERES PHASES TGB#A ET TGB#C SONT DECOUVERTES RESPECTIVEMENT EN 1989 (J. GOODBY) ET EN 1992 (H.T. NGUYEN). DANS CE MEMOIRE, NOUS ETUDIONS DANS UN PREMIER TEMPS LES PROPRIETES ELECTRIQUES DE PHASES TGB. LES TRAVAUX ONT PERMIS DE VALIDER LA NATURE HELIELECTRIQUE DE LA STRUCTURE TGB#C. L'ETUDE PAR DIFFRACTION X D'UN TGB#C SOUMIS A UN CHAMP ELECTRIQUE TRANSVERSE A PERMIS D'OBSERVER LES CHANGEMENTS STRUCTURAUX INDUITS : DEPLACEMENT DES JOINTS DE GRAIN (FREQUENCE DE COUPURE 10##3 HZ) ET FAIBLE ROTATION DES BLOCS SMECTIQUES. A LA TRANSITION TGB#A-TGB#C, UN EFFET ELECTRONIQUE EST INDUIT PAR UN CHAMP TRANSVERSE STATIQUE. LA MODELISATION DES INTERACTIONS AVEC LE CHAMP EXTERNE A PERMIS D'INTERPRETER LES OBSERVATIONS EXPERIMENTALES. DANS UNE DEUXIEME PARTIE, LA COMMENSURABILITE DE LA STRUCTURE (OU SYMETRIE QUASI-CRISTALLINE) EST ETUDIEE EN GEOMETRIE CONFINEE : L'INCOMMENSURABILITE OBSERVEE AUX FAIBLES EPAISSEURS LAISSE PLACE A UNE STRUCTURE COMMENSURABLE QUAND L'EPAISSEUR AUGMENTE.
Book Synopsis Propriétés diélectriques de la nouvelle phase cristal liquide TGBa by : Pascal Pochat
Download or read book Propriétés diélectriques de la nouvelle phase cristal liquide TGBa written by Pascal Pochat and published by . This book was released on 1996 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PREMIERE ET MAJEURE PARTIE DU TRAVAIL EST CONSACREE A L'ETUDE DES PROPRIETES DIELECTRIQUES DE CRISTAUX LIQUIDES FERROELECTRIQUES DE SYNTHESE RECENTE ET PRESENTANT LA PHASE SMECTIQUE TORSADEE PAR JOINTS DE GRAINS (TGBA). DEUX FAMILLES DE MESOGENES SONT ETUDIEES AINSI QUE DEUX TEXTURES DIFFERENTES DE LA PHASE TGBA. LES MODES DIELECTRIQUES SONT ANALYSES DE PART ET D'AUTRE DE LA TRANSITION SMECTIQUE SC#*-TGBA. L'EXPOSE DES RESULTATS EST PRECEDE D'UNE ANALYSE DES PROPRIETES GENERALES DES CRISTAUX LIQUIDES ET D'UNE PRESENTATION DES METHODES EXPERIMENTALES MISES EN UVRE. LA DERNIERE PARTIE EST UNE ETUDE DE FAISABILITE CONCERNANT L'UTILISATION DES CRISTAUX LIQUIDES DANS LE DOMAINE DES ONDES HYPERFREQUENCES
Book Synopsis Contribution à l'étude de la dynamique moléculaire dans les cristaux liquides antiferroélectriques à partir de leurs propriétés diélectriques by : François Bibonne
Download or read book Contribution à l'étude de la dynamique moléculaire dans les cristaux liquides antiferroélectriques à partir de leurs propriétés diélectriques written by François Bibonne and published by . This book was released on 1996 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: DEPUIS LA DECOUVERTE RECENTE D'UN PHENOMENE DE NATURE ANTIFERROELECTRIQUE POUR CERTAINS CRISTAUX LIQUIDES SMECTIQUES, DE NOMBREUSES ETUDES ONT ETE ENTREPRISES EN VUE D'UNE MEILLEURE COMPREHENSION DES STRUCTURES ET DES PROPRIETES DES DIFFERENTES MESOPHASES PRESENTES DANS CE TYPE DE MATERIAU. POUR UN ENSEMBLE DE PRODUITS ORIGINAUX, LA DETERMINATION DES MECANISMES DE REORIENTATION PROPRES A CHACUNE DES PHASES PAR LA SPECTROSCOPIE DIELECTRIQUE DANS LA GAMME BASSE FREQUENCE COMPRISE ENTRE 10 HZ ET 10 MHZ PERMET DE VALIDER CERTAINS MODELES STRUCTURAUX. AINSI EN PHASE ANTIFERROELECTRIQUE, L'ABSENCE DU MODE DE GOLDSTONE CONFIRME L'ALTERNANCE DE L'ORIENTATION DES MOLECULES D'UNE COUCHE A L'AUTRE. EN PHASE FERRIELECTRIQUE UNE STRUCTURE HELICOIDALE BICOUCHE CARACTERISEE PAR UN DEPHASAGE DEPENDANT UNIQUEMENT DE LA TEMPERATURE SE MANIFESTE PAR LA COEXISTENCE DE DEUX PROCESSUS DE RELAXATION DE FORTE AMPLITUDE. ENFIN LES RESULTATS EN PHASE ALPHA DENOTENT UNE TORSION HELICOIDALE TRES IMPORTANTE. PARALLELEMENT ON DECRIT LA REPONSE DIELECTRIQUE AUTOUR DE LA SEQUENCE DE PHASE ANTIFERRO-FERRI-FERRO ELECTRIQUE A L'AIDE D'UN MODELE PHENOMENOLOGIQUE BASE SUR LA THEORIE DE LANDAU
Book Synopsis Magnetism and Superconductivity by : Laurent-Patrick Levy
Download or read book Magnetism and Superconductivity written by Laurent-Patrick Levy and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: This up-to-date work presents a modern vision of magnetism and superconductivity covering both microscopic and phenomenological aspects. The basic information is illustrated with the help of current research topics such as the quantum Hall effect or mesoscopic aspects of superconductivity.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Combustion Synthesis: Novel Routes to Novel Materials by : Maximilian Lackner
Download or read book Combustion Synthesis: Novel Routes to Novel Materials written by Maximilian Lackner and published by Bentham Science Publishers. This book was released on 2010-07-08 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion Synthesis covers a wide range of technologies to produce advanced materials, ranging from oxides, nitrides and intermetallics to various nanostructured compounds, such as nanopowders and carbon nano tubes (CNT). This Ebook, with contributions from leading experts in industry and academia, provides an up-to-date overview about combustion synthesis. a comparison to conventional methods as well as a description of analytical techniques is given, alongside the description of special techniques, such as microwave or electrical field assistance. Aspects such as historic development and scale-up make this book a concise, yet comprehensive review about combustion synthesis. This book should be useful for scientists, engineers and practitioners working in materials science and related fields.
Book Synopsis Morphology of Crystals by : Ichiro Sunagawa
Download or read book Morphology of Crystals written by Ichiro Sunagawa and published by Springer. This book was released on 1988-02-29 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: The molecular mechanisms underlying the fact that a crystal can take a variety of external forms is something we have come to understand only in the last few decades. This is due to recent developments in theoretical and experimental investigations of crystal growth mechanisms. Morphology of Crystals is divided into three separately available volumes. Part A contains chapters on roughening transition; equilibrium form; step pattern theory; modern PBC; and surface microtopography. This part provides essentially theoretical treatments of the problem, particularly the solid-liquid interface. Part B contains chapters on ultra-fine particles; minerals; transition from polyhedral to dendrite; theory of dendrite; and snow crystals. All chapters are written by world leaders in their respective areas, and some can be seen as representing the essence of a life's work. This is the first English-language work which covers all aspects of the morphology of crystals - a topic which has attracted top scientific minds for centuries. As such, it is indispensable for anyone seeking an answer to a question relating to this fascinating problem: mineralogists, petrologists, crystallographers, materials scientists, workers in solid-state physics and chemistry, etc. In Parts A: Fundamentals and B: Fine Particles, Minerals and Snow equilibrium and kinetic properties of crystals are generally approached from an `atomistic' point of view. In contrast, Part C: The Geometry of Crystal Growth follows the alternative and complementary `geometrical' description, where bulk phases are considered as continuous media and their interfaces as mathematical surfaces with orientation-dependent properties. Equations of motion for a crystal surface are expressed in terms of vector and tensor operators working on surface free energy and growth rate, both expressed as functions of surface orientation and driving force, or `affinity' for growth. This approach emphasizes the interrelation between equilibrium and kinetic behavior. Part 1 establishes the theoretical framework. Part 2 gives a construction toolbox for explicit (analytic) functions. An extra chapter is devoted to experimental techniques for measuring such functions: a new approach to sphere growth experiments. The emphasis throughout is on principles and new concepts. Audience: Advanced readers familiar with traditional aspects of crystal growth theory. Can be used as the basis for an advanced course, provided supplementation is provided in the areas of atomistic models of the advancing surface, diffusion fields, etc.
Book Synopsis Bulletin de L'Institut International Du Froid by : International Institute of Refrigeration
Download or read book Bulletin de L'Institut International Du Froid written by International Institute of Refrigeration and published by . This book was released on 1983 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some numbers called Special issue and consist of summaries of papers to be presented at the International Congresses of Refrigeration.
Book Synopsis Neutron Diffraction Studies by : C. G. Shull
Download or read book Neutron Diffraction Studies written by C. G. Shull and published by . This book was released on 1949 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis X-Ray and Neutron Reflectivity: Principles and Applications by : Jean Daillant
Download or read book X-Ray and Neutron Reflectivity: Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Book Synopsis The Philosophy of Physical Science by : Sir Arthur Eddington
Download or read book The Philosophy of Physical Science written by Sir Arthur Eddington and published by BoD – Books on Demand. This book was released on 2021-03-17 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is often said that there is no "philosophy of science", but only the philosophies of certain scientists. But in so far as we recognize an authoritative body of opinion which decides what is and what is not accepted as present-day physics, there is an ascertainable present-day philosophy of physical science. It is the philosophy to which those who follow the accepted practice of science stand committed by their practice. This book contains the substance of the course of lectures which the author Eddington delivered as Tarner Lecturer of Trinity College Cambridge in the Easter Term 1938. The lectures have afforded him an opportunity of developing more fully than in his earlier books the principles of philosophic thought associated with the modern advances of physical science.
Book Synopsis Nondestructive Activation Analysis by : Saadia Amiel
Download or read book Nondestructive Activation Analysis written by Saadia Amiel and published by Elsevier Science & Technology. This book was released on 1981 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Diffusion in Materials - DIMAT 2011 by : Igor Bezverkhyy
Download or read book Diffusion in Materials - DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.
