Download or read book Synth se et caract risation de couches minces et de membranes de silice porosit ordonn e written by Michaela Klotz and published by . This book was released on 2000 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES PROPRIETES STRUCTURANTES DES MESOPHASES DE TYPE CRISTAL LIQUIDE LYOTROPE SONT ASSOCIEES AUX AVANTAGES DU PROCEDE SOL-GEL POUR LA FORMATION DE COUCHES MINCES CONTINUES DE SILICE. LA SYNTHESE DE MATERIAUX INORGANIQUES A TEXTURE POREUSE ORDONNEE PEUT AINSI ETRE OBTENUE PAR EFFET D'EMPREINTE APRES ELIMINATION DE LA MESOPHASE STRUCTURANTE. L'APPLICATION A L'ELABORATION DE MEMBRANES CERAMIQUES DOIT AINSI PERMETTRE UNE AMELIORATION DE LA PERMSELECTIVITE DES COUCHES SEPARATIVES, LIEE A LA MONODISPERSITE EN TAILLE DES PORES. LE CHOIX DES MOLECULES AMPHIPHILES STRUCTURANTES REND DE PLUS POSSIBLE L'AJUSTEMENT DE LA TAILLE DES PORES DE LA MEMBRANE. LES COUCHES A STRUCTURE HEXAGONALE SYNTHETISEES A L'AIDE DE TENSIOACTIFS DE TYPE ALKYLTRIMETHYLAMMONIUM SONT PLUS PARTICULIEREMENT ETUDIEES. IL EST EN NOTAMMENT MONTRE QUE LES CONDITIONS DE SYNTHESE PEUVENT ETRE DEFINIES A PARTIR DES DIAGRAMMES DE PHASE EAU TENSIOACTIF CORRESPONDANTS. LES RESULTATS SONT GENERALISES A D'AUTRES STRUCTURES ET D'AUTRES TYPES DE STRUCTURANTS. LA CARACTERISATION DES MATERIAUX PAR DIFFRACTION DES RAYONS X EN 1D OU 2D AINSI QUE LA MICROSCOPIE ELECTRONIQUE A TRANSMISSION METTENT EN EVIDENCE LA TEXTURATION DE LA COUCHE ET LE FAIT QUE LA STRUCTURE REELLE DES FILMS, APRES SECHAGE ET CALCINATION, N'EST PAS HEXAGONALE MAIS DE TYPE RECTANGLE CENTREE. LA STRUCTURE S'ORIENTE PARALLELEMENT AU SUBSTRAT, CE QUI EST NEFASTE POUR LA PERMEABILITE DES COUCHES POREUSES PRODUITES. POUR MODIFIER CETTE ANISOTROPIE, DES PARTICULES COLLOIDALES SONT INTRODUITES DANS LE MILIEU : DES COLLOIDES DE SILICE OU DES COLLOIDES MAGNETIQUES DE MAGHEMITE. CES DERNIERS SONT UTILISES AFIN D'EVALUER L'EFFET DE LEUR ROTATION SOUS CHAMP MAGNETIQUE SUR L'ORIENTATION DES CYLINDRES MICELLAIRES FORMANT LA MESOPHASE. LES INTERACTIONS ENTRE LES COLLOIDES INTRODUITS ET LES AUTRES CONSTITUANTS DU MILIEU REACTIONNEL SONT D'ABORD ETUDIEES. L'INFLUENCE DE L'ENSEMENCEMENT SUR LA TEXTURE ET LA PERMEABILITE DE COUCHES POREUSES EST ENSUITE EVALUEE.
Download or read book Synth se et caract risation de gels de silice dans les milieux amphiphiles organis s Application l laboration de mat riaux texture anisotrope ou porosit ordonn e et modulable written by Thierry Dabadie and published by . This book was released on 1994 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE NOUVELLE TECHNIQUE DE STRUCTURATION DE MATERIAUX INORGANIQUES PAR VOIE SOL-GEL A ETE MISE AU POINT. CERTAINS TENSIO-ACTIFS PERMETTENT LA PREPARATION DE CRISTAUX LIQUIDES LYOTROPES EN PHASE LAMELLAIRE OU HEXAGONALE. DE TELLES STRUCTURES SONT SUSCEPTIBLES D'ETRE FIGEES LORS DE LA GELIFICATION ET DE LA FORMATION DU RESEAU INORGANIQUE. DANS LE CAS DES GELS HUMIDES, CETTE TECHNIQUE PEUT GENERER UNE ORIENTATION ET UNE ANISOTROPIE DU RESEAU INORGANIQUE LORS DE L'APPLICATION D'UN CISAILLEMENT. DANS LE CAS DE GELS TRAITES THERMIQUEMENT, IL S'AVERE POSSIBLE D'OBTENIR UNE POROSITE ORDONNEE ET MODULABLE APRES ELIMINATION DE LA MESOPHASE STRUCTURANTE. DES COUCHES MINCES SONT PREPAREES ET APPLIQUEES A LA REALISATION DE MEMBRANES SEPARATIVES MICROPOREUSES. CES MEMBRANES SONT TESTEES EN PERVAPORATION
Download or read book Synth se et caract risation de membranes en silice m so et micro poreuses passives ou catalytiquement actives written by Christine Balzer Bichouard and published by . This book was released on 1994 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ZnO Thin Films written by Paolo Mele and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.
Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Plant Ecology written by Unesco and published by . This book was released on 1955 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Micro Mesoporous Materials written by K. Hadjiivanov and published by Heron Press. This book was released on 2008-10-31 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agricultural English written by Georgeta Raţă and published by Cambridge Scholars Publishing. This book was released on 2012-04-25 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agricultural English is a collection of essays on the English of Agriculture. The approach is a linguistic one: the different aspects of the English used in the field of agriculture (agricultural practices, agricultural systems) and in some fields related to agriculture (agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, zoology) are analysed from a morphological (combination, derivation), syntactical (nominal phrases, verbal phrases), lexical and lexicographical, semantic (homonymy, semantic fields, synonymy, terminology), pragmatic (academic discourse, idiom, metaphor), etymological (etymon, Latin heritage), and contrastive (English–Croatian, English–French, English–German, English–Romanian, Romanian–English) points of view. The book will appeal to agriculturists, animal breeders, professors, researchers, students, and translators from Croatian-, English-, French-, German-, and Romanian-speaking countries, active in their own countries or abroad. The types of academic readership it would appeal to include academic teaching staff, researchers and students in the fields of agriculture and related fields – agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, and zoology.
Download or read book The Problems of the Arid Zone written by Unesco and published by paris. This book was released on 1962 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Climatology written by Unesco and published by . This book was released on 1958 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modelling and Simulation in Thermal and Chemical Engineering written by J. Thoma and published by Springer Science & Business Media. This book was released on 2000 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main object of this book is modeling and simulation of energetic processes by bond graphs. But even without knowledge of this powerful method it can be used to a certain extent as an introduction to simulation in thermodynamics. The book addresses advanced students, lecturers and researchers in mechanical engineering and automation as well as experienced engineers in process industries.
Download or read book Climatologie Et Microclimatologie written by Unesco and published by . This book was released on 1958 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progress in Clean Energy Volume 2 written by Ibrahim Dincer and published by Springer. This book was released on 2015-11-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This expansive reference provides readers with the broadest available single-volume coverage of leading-edge advances in the development and optimization of clean energy technologies. From innovative biofuel feed stocks and processing techniques, to novel solar materials with record-breaking efficiencies, remote-sensing for offshore wind turbines to breakthroughs in high performance PEM fuel cell electrode manufacturing, phase change materials in green buildings to bio sorption of pharmaceutical pollutants, the myriad exciting developments in green technology described in this book will provide inspiration and information to researchers, engineers and students working in sustainability around the world.
Download or read book Environmental Physiology and Psychology in Arid Conditions written by Unesco and published by paris. This book was released on 1964 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Physiology and Psychology in Arid Conditions written by Unesco and published by . This book was released on 1963 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non Aboriginal material.
Download or read book Plant Physiology written by Frederick Campion Steward and published by . This book was released on 1972 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
