Download or read book Analyse des spectres infrarouges haute r solution des formes isotopiques de l ozone Application aux tudes atmosph riques written by Arnaud Chichery and published by . This book was released on 2000 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: OUTRE SON INTERET FONDAMENTAL POUR LA COMPREHENSION DE LA DYNAMIQUE INTRAMOLECULAIRE, L'ETUDE DE LA MOLECULE D'OZONE S'AVERE ETRE TRES IMPORTANTE COMPTE TENU DE SON IMPACT SUR LA PHYSICO-CHIMIE DE L'ATMOSPHERE TERRESTRE. LES TRAVAUX PRESENTES ICI S'INSCRIVENT DANS LE CADRE DE L'ANALYSE EXHAUSTIVE DU SPECTRE INFRAROUGE DE CETTE MOLECULE ET DE SES DERIVES ISOTOPIQUES, CONDUISANT AINSI AUX PARAMETRES SPECTROSCOPIQUES DE 57 ETATS VIBRATIONNELS. A L'AIDE DU SPECTROMETRE PAR TRANSFORMEE DE FOURIER DE L'UNIVERSITE DE REIMS, DE NOMBREUX SPECTRES ONT ETE ENREGISTRES POUR LES MOLECULES 1 6O 3, 1 8O 3, AINSI QUE POUR LES ISOTOPES MONOSUBSTITUES EN 1 6O ET 1 8O. LEUR ANALYSE A CONDUIT A L'INTERPRETATION D'UN GRAND NOMBRE DE BANDES VIBRATIONNELLES UTILISANT TRES SOUVENT UN MODELE D'INTERACTION EN POLYADE, TENANT COMPTE DES RESONANCES ANHARMONIQUES ET DE CORIOLIS. LES MOLECULES 1 6O 3 ET 1 8O 3 (VARIETE ISOTOPIQUE TOTALEMENT SUBSTITUEE) PRESENTENT LES MEMES PROPRIETES DE SYMETRIE ET ONT, PAR CONSEQUENT, DES STRUCTURES SPECTRALES SIMILAIRES. EN OUTRE, LES RESONANCES OBSERVEES PRESENTENT DES CARACTERISTIQUES COMMUNES : DANS LES DEUX CAS, LES SCHEMAS DE RESONANCES LIES A LA PROXIMITE 1 3 QUI PERMETTENT DE DECRIRE LES ETATS INFERIEURS, NE SEMBLENT PAS DIRECTEMENT EXTRAPOLABLES AUX ETATS EXCITES : CERTAINS COUPLAGES DEVIENNENT NEGLIGEABLES TANDIS QUE DE NOUVELLES RESONANCES ACCIDENTELLES DOIVENT ETRE INTRODUITES DANS LES MODELES. L'ETUDE DES BANDES DES ISOTOPES MONOSUBSTITUES EN 1 6O ET 1 8O EST RENDUE TRES DELICATE DU FAIT DE LA PRESENCE DE L'ENSEMBLE DE CES ESPECES DANS LA CELLULE. C'EST POURQUOI L'OBJECTIF A LE PLUS SOUVENT ETE LIMITE A LA DETERMINATION DES CENTRES DE BANDES AFIN DE COMPLETER LES INFORMATIONS NECESSAIRES A LA DETERMINATION
Download or read book Spectroscopie infrarouge haute r solution par lasers accordables written by Nofal Ibrahim and published by . This book was released on 2006 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: La spectroscopie infrarouge à haute résolution est un outil très puissant pour mesurer les concentrations d’un grand nombre de gaz traces atmosphériques et pour caractériser les propriétés physico-chimiques de ces espèces. L’utilisation de lasers accordables permet de balayer de petits intervalles spectraux avec une très haute résolution spectrale et un rapport signal/bruit très élevé. Ainsi, la détermination expérimentale des paramètres de raies par spectroscopie laser complète les informations obtenues par la spectroscopie à transformée de Fourier. Nous avons travaillé dans cette thèse sur la conception et la réalisation de plusieurs spectromètres basés sur des diodes-laser accordables et les applications de ces instruments pour la spectroscopie quantitative d’espèces d’intérêt atmosphérique. Nous avons réalisé quatre études différentes : Une étude pour mesurer les paramètres spectroscopiques (intensités, coefficients d’élargissement) de H2O dans l’infrarouge proche (au voisinage de 820 nm) en utilisant une diode laser à cavité externe (ECDL) et la technique de spectroscopie directe. Une étude d’intercomparaison des coefficients d’absorption de l’ozone entre deux régions spectrales : l’ultraviolet (270-290 nm) et l’infrarouge moyen (à 10 micron). Étude des paramètres spectroscopiques (positions, intensités, et coefficients d’élargissement) et limite de détection de NH3 simultanément par deux techniques différentes (spectroscopie d’absorption directe et spectroscopie photoacoustique) au voisinage de 1550 nm. La première mesure des coefficients d’élargissement par l’air de HO2 par la technique CRDS au voisinage de 1550 nm.
Download or read book Spectres haute r solution infrarouge et microonde de la bande Nu 3 de l ozone written by Nicole Monnanteuil and published by . This book was released on 1976 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE MODELE PROPOSE PERMET L'IDENTIFICATION DU SPECTRE HAUTE RESOLUTION DE LA BANDE NU ::(3) DE L'OZONE A PARTIR DES ETUDES MICROONDES DE L'ETAT FONDAMENTAL ET DES ETATS EXCITES NU ::(1)=1 ET NU ::(3)=1. L'ANALYSE DU SPECTRE CONDUIT A LA DETERMINATION DE PARAMETRES DONNANT UN ACCORD SATISFAISANT ENTRE SPECTRE CALCULE ET EXPERIMENTAL. LE CALCUL DES NIVEAUX D'ENERGIE DE L'ETAT NU ::(3)=1 ET DES FONCTIONS D'ONDE CORRESPONDANTES PERMET UNE PRESENTATION DES PHENOMENES DE RESONANCE DE CORIOLIS ENTRE NU ::(1)=1 ET NU ::(3)=1. COMME IL SUBSISTE QUELQUES ECARTS ENTRE SPECTRE EXPERIMENTAL ET CALCULE POUR LES NIVEAUX FORTEMENT AFFECTES PAR LA RESONANCE, IL SEMBLE QUE LE MODELE UTILISE N'EST PAS SUFFISAMMENT DEVELOPPE QUANT AUX TERMES DE COUPLAGE.
Download or read book Contribution l tude des tats excit s rovibrationnels de D2O et O3 par l analyse de spectres infrarouges haute r solution written by Eugeniya Starikova and published by . This book was released on 2009 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents the studies of the excited rovibrational states of D2O and O3 by the analyses of the high resolution spectra. The first part is dedicated to the D2160 isotopologue of the water molecule. The emission spectra have been recorded in the 320-520 cm-1 and 1800-5600 cm-1 spectral ranges. For the first time, the emission spectra at high temperature (1000-2000 K) have also been recorded. To correctly reproduce the set of the observed excited rovibrational states, the effective Hamiltonian uses the G-function. Our studies provide new information concerning the excited rovibrational states, as well as the spectroscopic assignment. The second part is dedicated to the 1803 isotopologue of the ozone molecule. The CRDS spectra have been recorded in the 5900-7000 cm-1 spectral range. The higher observed energy levels correspond to 82% of the dissociation energy of the molecule. The observations have been modelled by effective Hamiltonians including a large number of resonances between interacting vibrational states. These CRDS spectra allowed to study the isotopic shifts in vibrational levels of ozone du to the homogeneous substitution 1603-1803.
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 The Ecology of Even aged Forest Plantations written by International Union of Forestry Research Organizations. Division I--Site and Silviculture and published by . This book was released on 1979 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book El Ni o written by Bruno Voituriez and published by UNESCO. This book was released on 2000 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: El Nino, caprice of the heavens, scapegoat for every calamity? The general public cannot really understand what is behind the El Nino phenomenon. The book offers a tour of the Earth's climate to understand one of its normal but extreme components.
Download or read book Anagram Solver written by Bloomsbury Publishing and published by Bloomsbury Publishing. This book was released on 2009-01-01 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anagram Solver is the essential guide to cracking all types of quiz and crossword featuring anagrams. Containing over 200,000 words and phrases, Anagram Solver includes plural noun forms, palindromes, idioms, first names and all parts of speech. Anagrams are grouped by the number of letters they contain with the letters set out in alphabetical order so that once the letters of an anagram are arranged alphabetically, finding the solution is as easy as locating the word in a dictionary.
Download or read book Model Cellulosic Surfaces written by Maren Roman and published by OUP USA. This book was released on 2010-04-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of the different methods of model cellulosic surface preparation and presents recent studies on the properties of these surfaces. The topics covered are considered relatively new and would serve as the launch pad for further research in this area.
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 Agrochimica written by International Atomic Energy Agency and published by . This book was released on 1977 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic matter and soil productivity; Turnover of plant residues; Mineralization of organic compounds; Dynamics of organic forms of nitrogen; Nitrogen economy; Biodegradation of organic matter; Biochemical transformation of organic matter; Bitumens in soil organic matter; Characterization of humic acids; Carbon dating; Modern techniques and their implact on soil organic matter research; Sludge; Soil organic matter components and plant metabolism; Interaction between agrochemicals and organic matter; Peat.
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 Newer Trace Elements in Nutrition written by Walter Mertz and published by . This book was released on 1971 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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:
Download or read book Plant Response to Climatic Factors written by R. O. Slatyer and published by . This book was released on 1973 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
