Download or read book REACTION DE DEPLACEMENT DU GAZ A L EAU ET REDUCTION ELECTROCATALYTIQUE DU DIOXYDE DE CARBONE written by ROMAIN.. RUPPERT and published by . This book was released on 1985 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: PREPARATION DE CATALYSEURS: COMPLEXES DE IR ET RH AVEC DES PHENANTHROLINES, POUR CATALYSE HOMOGENE. ELECTROREDUCTION PAR DES COMPLEXES MACROCYCLIQUES, EN PARTICULIER DE NI

Download or read book Electrocatalyse de la r duction s lective du dioxyde de carbone sur lectrodes diffusion de gaz written by Ziad Bitar and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse s'inscrit dans le cadre de la valorisation du CO2 par voie électrochimique. Il est consacré en grande partie à l'élaboration et l'étude physico-chimique d'électrodes à diffusion de gaz (GDE), dans le but de mieux comprendre les mécanismes et les paramètres déterminants pour l'électrocatalyse de la réduction du CO2 avec ce type d'électrodes poreuses. Cette étude est articulée autour de deux axes principaux, le premier concerne des catalyseurs métalliques et le second se focalise sur des catalyseurs moléculaires.Le premier axe est relatif à la préparation, la caractérisation et l'étude électrochimique de catalyseurs de Cu, Co, In, Zn, Bi, Fe et Pb supportés sur poudre de carbone poreux. La mise en œuvre de ces catalyseurs sous forme de GDE a été étudiée, ainsi que leur activité électrocatalytique vis-à-vis la réduction du CO2. En milieu aqueux, les GDE contenant de l'indium ont permis d'obtenir les meilleurs rendements faradiques pour l'électroréduction du CO2 en acide formique. Par comparaison avec une plaque métallique d'indium, les GDE-In/C montrent des performances catalytiques améliorées et une meilleure résistance aux impuretés de l'électrolyte. Nous avons montré, qu'en phase aqueuse, l'apport de CO2 gaz en continu à travers une GDE entraînait une amélioration de l'activité du catalyseur supporté. Ceci met en évidence l'intérêt d'utiliser des métaux sous forme de particules dispersées au sein d'une GDE plutôt que des électrodes métalliques massives.Le second axe de cette étude a fait appel à trois complexes dimère de ruthénium de formule générale [Ru(L)(CH3CN)(CO)2]2(PF6)2. L'étude des propriétés redox de ces précurseurs de catalyseurs contenant des ligands L (bipyridine) diversement substitués a permis de mettre en évidence la formation de polymères à liaisons Ru-Ru par électroréduction. Le ligand portant une fonction pyrrole permet, au préalable, la formation d'un film de polypyrrole conférant au catalyseur une meilleure stabilité et de meilleures performances catalytiques. Différentes stratégies d'immobilisation de ces complexes sur carbone poreux ont été utilisées pour obtenir des GDE modifiées. Cette étude a permis de mieux comprendre l'interaction entre le catalyseur moléculaire et le support lors de la réduction du CO2. Nous avons ainsi montré que l'activité électrocatalytique du catalyseur supporté sur GDE était maintenue en milieu aqueux.Parallèlement à ce travail fondamental, un pilote de laboratoire a été développé pour effectuer la réduction électrocatalytique du CO2 en phase gaz, afin de s'affranchir de limitations rencontrées en milieu aqueux, telles que la solubilité du CO2 et la séparation des produits de la réaction. Cette étude en cours de développement a permis d'identifier certains verrous, notamment la nature de la membrane échangeuse d'ions ainsi que la nature et la proportion du polymère électrolytique entrant dans la formulation de la couche catalytique. Ce travail apporte des connaissances fondamentales et des réponses concrètes qui permettront probablement qu'un tel procédé de valorisation du CO2 puisse constituer un jour un procédé viable à l'échelle industrielle.

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.

Download or read book An Introduction to Differential Manifolds written by Jacques Lafontaine and published by Springer. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.

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 Aeronomy written by P. M. Banks and published by Elsevier. This book was released on 2013-09-24 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.

Download or read book Minimum competence in scientific English written by Sue Blattes and published by L'Editeur : EDP Sciences. This book was released on 2003 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage, devenu célèbre sous son sigle MCSE, a déjà été utilisé par plus de 50 000 étudiants, chercheurs, professionnels. L'objectif est de lire et écrire des textes en anglais scientifique avec facilité et pertinence. L'ouvrage est conçu pour que l'apprenant devienne un véritable utilisateur de l'anglais. La méthode originale repose sur l'analyse des fonctions et structures nécessaires : measurement, frequency, comparison, modification, link words, time, cause and consequence, hypothesis, modality, purpose and process, impersonal forms, compound nouns and adjectives. Dans chaque unit, des tests d'auto-évaluation permettent de se situer et de construire son parcours de formation, d'abord en définissant ses objectifs à l'aide des key points et du lexis, puis, de façon plus personnalisée, en puisant dans les examples in context, checkpoints (back to basics, word web), web search, FAQs... MCSE est l'outil de base d'une méthode qui comprend aussi d'autres outils dans la même collection (Listening Comprehension for Scientiflc English et Speaking Skills in Scientitic English). L'ouvrage est destiné à tout apprenant de niveau baccalauréat qui désire acquérir une réelle compétence dans l'écriture et la lecture de textes en anglais scientifique.

Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.

Download or read book Popular Astronomy written by Camille Flammarion and published by . This book was released on 1894 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book Essentials in Modern HPLC Separations written by Serban C. Moldoveanu and published by Elsevier. This book was released on 2022-06-24 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt: Essentials in Modern HPLC Separations, Second Edition discusses the role of separation in high performance liquid chromatography (HPLC). This new and updated edition systematically presents basic concepts as well as new developments in HPLC. Starting with a description of basic concepts, it provides important guidance for the practical utilization of various HPLC procedures, such as the selection of the HPLC type, proper choice of the chromatographic column, selection of mobile phase and selection of the method of detection, all of which are in correlation with the physico-chemical characteristics of the compounds separated. Every chapter has been carefully reviewed, with several new sections added to bring the book completely up-to-date. Hence, it is a valuable reference for students and professors in chemistry. - Provides a thoroughly updated resource, with an entirely new section on Computer-aided Method Development in HPLC and new subsections on miniaturization and automation in HPLC, chemometric aspects of HPLC, green solvent use in HPLC, and more - Includes insights into the chromatographic process to find the optimum solution for analyzing complex samples - Presents a basis for understanding the utilization of modern HPLC for applications, particularly for the analysis of pharmaceutical, biological, food, beverage and environmental samples

Download or read book Industrial Uses of Large Radiation Sources written by International Atomic Energy Agency and published by . This book was released on 1963 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book Bank Profitability Statistical Supplement written by Organisation for Economic Co-operation and Development and published by . This book was released on 1987 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Decisions of the Commissioner of Patents written by and published by . This book was released on 1871 with total page 230 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.