Download or read book ETUDE DES TRANSITIONS DE PHASES DE FLUIDES CONFINES DANS LE SILICIUM POREUX written by CENDRINE.. FAIVRE and published by . This book was released on 1998 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PROPRIETE ORIGINALE DU SILICIUM POREUX D'ETRE A LA FOIS NANOPOREUX ET MONOCRISTALLIN NOUS A PERMIS D'OBTENIR DES INFORMATIONS NOUVELLES EN UTILISANT LA DIFFRACTION DES RAYONS X. LES RESULTATS CONCERNENT L'ETUDE STRUCTURALE DES COUCHES DE TYPE P#+ FORMEES SUR UN SUBSTRAT ORIENTE (111), LA MESURE DU COEFFICIENT DE DILATATION THERMIQUE DU SILICIUM POREUX ET LES DEFORMATIONS INDUITES PAR LA PRESENCE DE CDS DANS LES PORES. LA DEUXIEME MOTIVATION DE CETTE THESE CONCERNAIT L'ETUDE PLUS FONDAMENTALE DES CHANGEMENTS DE PHASES DE FLUIDES CONFINES DANS LE SILICIUM POREUX. DU POINT DE VUE DU FLUIDE, LA CALORIMETRIE DIFFERENTIELLE A ETE UTILISEE POUR MESURER LES DECALAGES EN TEMPERATURE DES TRANSITIONS DE PHASES, LIES AUX EFFETS DE CONFINEMENT. UN MODELE DECRIVANT LES MECANISMES THERMODYNAMIQUES DE LA TRANSITION CONFINEE ET TENANT COMPTE DE LA GEOMETRIE DES PORES, A PERMIS DE BIEN DECRIRE LES RESULTATS EXPERIMENTAUX ET DE DEDUIRE LA DISTRIBUTION DE TAILLES DES PORES. CE TRAVAIL A PU ETRE APPLIQUE A DIFFERENTS EFFETS TELS QUE LA DISSOLUTION CHIMIQUE OU L'HOMOGENEITE DES COUCHES. DU POINT DE VUE DE LA MATRICE POREUSE, LES DEFORMATIONS INDUITES PAR LES TRANSITIONS LIQUIDE-VAPEUR ET SOLIDE-LIQUIDE DU FLUIDE CONFINE ONT ETE MESUREES IN SITU PAR DIFFRACTION DES RAYONS X. DANS LE CAS DE L'ADSORPTION, LA VALEUR DE LA PRESSION DE VAPEUR CORRESPONDANT A UNE AMPLITUDE DE DEFORMATION MAXIMALE A ETE MESUREE ET RELIEE A LA TAILLE DES PORES PAR L'EQUATION DE KELVIN. EN CONSIDERANT LES PROPRIETES ELASTIQUES DU SILICIUM POREUX, LES CONTRAINTES CAPILLAIRES INDUITES PAR LA PRESENCE DE MENISQUES DANS LES PORES ONT ETE ESTIMEES LORS DE L'EVAPORATION, ET LES RESULTATS ONT PU ETRE APPLIQUES AU PROBLEME DU SECHAGE DE COUCHES TRES POREUSES. D'AUTRE PART, LA CONSTRUCTION AU COURS DE MA THESE D'UN NOUVEAU DIFFRACTOMETRE A PERMIS DE MESURER IN SITU DES DEFORMATIONS DE LA COUCHE POREUSE LORS DE LA SOLIDIFICATION DU FLUIDE ORGANIQUE AU SEIN DES PORES, LIEES A L'EXISTENCE DE CONTRAINTES CAPILLAIRES.
Download or read book Physique des transitions de phases written by Pierre Papon and published by . This book was released on 1999 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: La physique des transitions de phases est un domaine important à la frontière de plusieurs disciplines et elle joue un rôle central en sciences des matériaux. Cet ouvrage, destiné aux étudiants de maîtrise, de DEA et des écoles d'ingénieurs, traite en onze chapitres des grandes classes de transitions de phases dans les fluides et les solides : vaporisation, fusion, solidification, transitions magnétiques, phénomènes critiques, supraconductivité... Les deux premiers chapitres sont une description générale des phénomènes, chacun des six chapitres suivants aborde l'étude d'une transition spécifique, en explicitant les caractéristiques, les méthodes expérimentales pour l'étudier, les principaux modèles théoriques qui permettent de la prévoir ainsi que ses applications. Les trois derniers chapitres sont consacrés au rôle des microstructures et des nanostructures, aux transitions dans les films minces et aux phénomènes de transitions de phases dans les grands systèmes naturels et techniques. A la fin de chaque chapitre sont proposés des exercices, dont les solutions se trouvent en fin d'ouvrage, ainsi qu'une bibliographie de base.
Download or read book Caract risations physicochimiques de silices m soporeuses fonctionnalis es du type SBA 15 written by Nadia Fekkar-Nemmiche and published by . This book was released on 2009 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail est consacré à l'étude des propriétés physico-chimiques de silices mésoporeuses fonctionnalisées du type SBA-15. Il a consisté à caractériser i) la structure mésoporeuse par DRX et par isothermes d'adsorption d'azote, ii) les états de surface de la silice par RMN lorsqu'on passe d'une fonction propyle à une chaîne -CH2-CH2-CH2-PO(OX)2 où X=Et, H, Li, Na et K, iii) les propriétés de confinement de trois adsorbats (eau, 1-pentanol et n-heptane) par analyses thermiques et iv) les propriétés de conduction ionique par spectroscopie d'impédance complexe. L'examen de la microstructure par RMN du solide a permis de mettre en évidence que la substitution des silanols de surface des pores des silices étudiées par des groupements tétraméthylsilyles (-Si(CH3)3) n'était pas totale. Les analyses par DSC des silices exposées la vapeur saturante d'eau, de 1-pentanol ou de n-heptane ont révélé que les températures de transitions de phase du fluide confiné dans les pores sont modifiées par rapport à celles du fluide en volume étendu. Ceci est dû à l'effet combiné d'une dimension réduite et de l'interface fluide–mur, siège d'interactions spécifiques liées à la nature (polaire ou apolaire) des groupements introduits à la surface des pores. En présence d'eau confinée, les analyses RMN ont montré que celle-ci conserve sa coordination tétraédrique et que la mobilité des chaînes à la surface des pores augmente. L'étude de la conductivité par SIC des silices soumises à la vapeur saturante d'eau, de 1-pentanol ou de n-heptane indique que tous les solides étudiés sont des isolants tant qu'il n'y a pas de phase adsorbée. Lorsqu'une conductivité apparait, elle est de type ionique
Download or read book SYNTHESE DE SILICIURES written by NADINE.. MALHOUROUX-GAFFET and published by . This book was released on 1993 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA CROISSANCE DES SILICIURES SUR SILICIUM A FAIT L'OBJET DE NOMBREUSES ETUDES MOTIVEES PAR LE CARACTERE METALLIQUE ET LA BONNE STABILITE EN TEMPERATURE DE CES MATERIAUX. DEPUIS QUELQUES ANNEES LES SILICIURES OUBLIES JUSQU'ALORS PRESENTANT DES PROPRIETES DIFFERENTES SONT AUSSI ETUDIES. C'EST LE CAS DU DISILICIURE DE FER DONT LA PHASE BASSE TEMPERATURE (BETA) SERAIT SEMICONDUCTRICE A GAP DIRECT. LES TRAVAUX DE CETTE THESE ONT CONSISTE A FORMER DU DISILICIURE DE FER PAR REACTION A L'ETAT SOLIDE DANS DES COUCHES MINCES ET DANS DES POUDRES FE+2SI BROYEES. POUR CELA DIFFERENTES ETUDES DE DIFFRACTION AUX RAYONS X, DE MET, DE MEB, DE MICROSCOPIE A FORCE ATOMIQUE, PROFILOMETRIE ET DE PHOTOLUMINESCENCE ONT ETE EFFECTUEES. LE PREMIER CHAPITRE EST UNE ETUDE BIBLIOGRAPHIQUE DES DIFFERENTS TRAVAUX PORTANT SUR LES SILICIURES SUIVIE D'UNE ANALYSE DES PARAMETRES PERTINENTS GOUVERNANT LA FORMATION DE CES MATERIAUX. LE SECOND CHAPITRE EST CONSACRE A L'ETUDE DES REACTIONS DE FILMS MINCES DE FER ET DE SILICIUM SUR UN SUBSTRAT MONOCRISTALLIN DE SILICIUM. LES RESULTATS MONTRENT L'OBTENTION DE LA PHASE HAUTE TEMPERATURE INATTENDUE A LA TEMPERATURE DE TRAVAIL UTILISEE ET LA FORMATION DE LA PHASE BASSE TEMPERATURE PAR DEUX MODES DIFFERENTS: UNE CROISSANCE CLASSIQUE AVEC UNE MORPHOLOGIE DE SURFACE FACETTEE ET UNE CROISSANCE EXPLOSIVE REVELANT DES CERCLES CONCENTRIQUES EN SURFACE. LE TROISIEME CHAPITRE TRAITE DE LA FORMATION DE SILICIURE DE FER PAR MECANO-SYNTHESE REACTIVE QUI CONSISTE A RECUIRE DES POUDRES FE+2SI PREALABLEMENT BROYEES. CETTE TECHNIQUE QUI PERMET D'EXPLOITER DES PARAMETRES NON ETUDIES AVEC LA METHODE PRECEDENTE NOUS PERMET D'ETABLIR UN SCHEMA REACTIONNEL ABOUTISSANT A LA SYNTHESE DE BETA FESI#2 ET DE METTRE EN EVIDENCE LE ROLE DE L'ETAT INITIAL DES GRAINS DE FER. A TRAVERS LES RESULTATS OBTENUS DANS CE DERNIER CHAPITRE, LA MECANO-SYNTHESE APPARAIT COMME ETANT UNE TECHNIQUE TRES PROMETTEUSE CAR ELLE PERMET D'ABAISSER LA TEMPERATURE D'ELABORATION DES MATERIAUX ET DE FORMER DES PHASES METASTABLES
Download or read book Adhesion Between Polymers and Concrete Adh sion Entre Polym res Et B ton written by H. R. Sasse and published by Springer. This book was released on 1986 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.
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.
Download or read book Basic Technics in Ecological Farming Techniques de Base en Agriculture Biologique Grunds tzliche Verfahren der kologischen Landwirtschaft Le Maintien de la Fertilit des Sols The Maintenance of Soil Fertility Die Erhaltung der Bodenfruchtbarkeit written by Stuart Hill and published by Birkhäuser. This book was released on 2013-12-14 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1985-11 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book In Vessel Melt Retention and Ex Vessel Corium Cooling IAEA Tecdoc No 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Download or read book Explosives written by Josef Köhler and published by Wiley-VCH. This book was released on 1992-11-27 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: This highly acclaimed reference work has set worldwide standards in the field of explosives and propellant materials for the past 60 years. Now in its 4th revised English Edition it describes 120 explosive substances with their formulae, performance, sensitivity characteristics and trade names. Instructions and tables for the calculation of thermodynamic data are also included. A special feature is the short dictionary of explosive characteristics in six languages: English, German, French, Spanish, Russian and Czechoslovakian. From reviews on the 3rd English Edition: 'This wealth of information and an index that comprises some 2500 key-words and several conversion tables make this book a unique source of knowledge for anybody working with explosives.' Propellants, Explosives, Pyrotechnics. 'The objective of the book is to provide fundamental information on the subject of explosives not only to experts but also to the general public. The book will therefore, apart from industrial companies and research facilities concerned, be found useful in documentary centers, translation bureaus, editorial offices, patent and lawyer offices, and other institutions of this nature.' Mining Engineering
Download or read book Guidelines for Soil Description written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2006 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soils are affected by human activities, such as industrial, municipal and agriculture, that often result in soil degradation and loss. In order to prevent soil degradation and to rehabilitate the potentials of degraded soils, reliable soil data are the most important prerequisites for the design of appropriate land-use systems and soil management practices as well as for a better understanding of the environment. The availability of reliable information on soil morphology and other characteristics obtained through examination and description of the soil in the field is essential, and the use of a common language is of prime importance. These guidelines, based on the latest internationally accepted systems and classifications, provide a complete procedure for soil description and for collecting field data. To help beginners, some explanatory notes are included as well as keys based on simple test and observations.--Publisher's description.
Download or read book Satellite Situation Report written by Goddard Space Flight Center. Office of Public Affairs and published by . This book was released on 1977 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Download or read book Rock Blasting and Explosives Engineering written by Per-Anders Persson and published by CRC Press. This book was released on 2018-05-04 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock Blasting and Explosives Engineering covers the practical engineering aspects of many different kinds of rock blasting. It includes a thorough analysis of the cost of the entire process of tunneling by drilling and blasting in comparison with full-face boring. Also covered are the fundamental sciences of rock mass and material strength, the thermal decomposition, burning, shock initiation, and detonation behavior of commercial and military explosives, and systems for charging explosives into drillholes. Functional descriptions of all current detonators and initiation systems are provided. The book includes chapters on flyrock, toxic fumes, the safety of explosives, and even explosives applied in metal working as a fine art. Fundamental in its approach, the text is based on the practical industrial experience of its authors. It is supported by an abundance of tables, diagrams, and figures. This combined textbook and handbook provides students, practitioners, and researchers in mining, mechanical, building construction, geological, and petroleum engineering with a source from which to gain a thorough understanding of the constructive use of explosives.
