Etude De La Cinetique Des Ions Negatifs O Dans Une Decharge Luminescente Doxygene

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Etude de la cinétique des ions négatifs O dans une décharge luminescente d'oxygène

Author : Assia Zellagui
Publisher :
ISBN 13 :
Total Pages : 161 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis Etude de la cinétique des ions négatifs O dans une décharge luminescente d'oxygène by : Assia Zellagui

Download or read book Etude de la cinétique des ions négatifs O dans une décharge luminescente d'oxygène written by Assia Zellagui and published by . This book was released on 1991 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail concerne l'étude des processus de peuplement et de destruction des ions négatifs crées dans la colonne positive d'une décharge luminescente d'oxygène à basse pression (0.1-3 torr; 5-80 ma). Les concentrations absolues d'ions o sont mesurées par photo détachement laser à partir de l'impulsion de courant de décharge induite par la perturbation laser. Ce diagnostic a été validé par la mesure directe à l'aide d'une cavité hyperfréquence de l'impulsion de densité électronique photo détachée. Des concentrations d'ions négatifs de l'ordre de la densité électronique ont été mesurées. Les oscillations observées lors de la relaxation des impulsions de densité électronique et de courant de décharge sont interprétées en terme d'excitation d'une onde acoustique ionique, dont la vitesse de propagation dépend de la population des ions négatifs. Les résultats des concentrations d'ions négatifs mesurées sont interprétés à l'aide d'un modèle cinétique. On montre que ces ions sont confinés au centre de la décharge par le champ de charge d'espace, et ne peuvent atteindre la paroi. Ils sont créés par attachement dissociatif à partir des molécules d'oxygène à l'état fondamental et à l'état métastable singulet, et sont détachés par collision avec les atomes et les molécules métastables à l'état singulet. Leur concentration relative moyenne par rapport à la densité électronique est donnée par le rapport des coefficients d'attachement et de détachement. Les diagnostics mis au point, et le code de calcul développé pourront être utilisés pour étudier d'autres gaz électronégatifs

ETUDE D'UNE DECHARGE LUMINESCENTE D'OXYGENE PAR SPECTROSCOPIE V.U.V

Author : Pierre Panafieu
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis ETUDE D'UNE DECHARGE LUMINESCENTE D'OXYGENE PAR SPECTROSCOPIE V.U.V by : Pierre Panafieu

Download or read book ETUDE D'UNE DECHARGE LUMINESCENTE D'OXYGENE PAR SPECTROSCOPIE V.U.V written by Pierre Panafieu and published by . This book was released on 1986 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA COLONNE POSITIVE D'UNE DECHARGE CONTINUE D'OXYGENE A BASSE PRESSION (0,2-5 TORR). LES CONCENTRATIONS DE O::(2)(X**(3)SIGMA ), O::(2)(**(1)ALAPLACIEN DE ), O, O::(3) SONT DETERMINEES PAR SPECTROSCOPIE D'ABSORPTION DANS L'U.V. SOUS-VIDE. LES PROBLEMES SPECIFIQUES A L'ABSORPTION DANS L'U.V. LOINTAIN SOUS-VIDE SONT EXPOSES AINSI QUE LES SOLUTIONS EXPERIMENTALES RETENUES. UN MODELE CINETIQUE SIMPLE DESTINE A RENDRE COMPTE DES RESULTATS EXPERIMENTAUX EST ETABLI. CE MODELE INCLUT LES ESPECES DOSEES, O::(2), O::(2)(**(1)LAPLACIEN DE ), O, O::(3), N::(E) ET LES IONS O::(2)**(+) ET O**(-). IL COMPREND 13 EQUATIONS TRADUISANT LES REACTIONS PREPONDERANTES POUR CHACUNE DES ESPECES CITEES. LE SYSTEME D'EQUATIONS DIFFERENTIELLES COUPLEES REPRESENTANT LES PROCESSUS DE GAIN ET DE PERTE POUR CHAQUE ESPECE EST RESOLU PAR UNE METHODE NUMERIQUE A PAS VARIABLE

Exchange Reactions

Author :
Publisher :
ISBN 13 :
Total Pages : 442 pages
Book Rating : 4.:/5 (36 download)

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Book Synopsis Exchange Reactions by :

Download or read book Exchange Reactions written by and published by . This book was released on 1965 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

ICREEC 2019

Author : Ahmed Belasri
Publisher : Springer Nature
ISBN 13 : 9811554447
Total Pages : 659 pages
Book Rating : 4.8/5 (115 download)

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Book Synopsis ICREEC 2019 by : Ahmed Belasri

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.

Aromatic C-nitroso Compounds

Author : Hrvoj Vančik
Publisher : Springer Science & Business Media
ISBN 13 : 9400763379
Total Pages : 168 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Aromatic C-nitroso Compounds by : Hrvoj Vančik

Download or read book Aromatic C-nitroso Compounds written by Hrvoj Vančik and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed to collect and review the research covering main directions in investigations of aromatic nitroso compounds in last decades, and to present both, the academic aspects of this chemistry, as well as the open field of its applicability. The book is divided in five chapters. The basic structural properties of the nitroso aromatic molecules are described in the first chapter. The second chapter is an overview of the methods of preparations of aromatic nitroso and polynitroso compounds, including classical synthetic methods and some new preparative approaches. The third part deals with the physico-chemical properties of nitroso aromates and azodioxides, its structure, crystallography, quantum chemical calculations, spectroscopy, typical reactions, and especially it is focused on the dimerizations in the solid-state. In the fourth chapter is represented organometallic chemistry of nitroso aromatic molecules and its applications in catalysis. The last part of the book deals with the behavior of this class of compounds in the biological systems, reactions with biomolecules and the use in toxicology.

An Introduction to Differential Manifolds

Author : Jacques Lafontaine
Publisher : Springer
ISBN 13 : 3319207350
Total Pages : 408 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis An Introduction to Differential Manifolds by : Jacques Lafontaine

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.

Aeronomy

Author : P. M. Banks
Publisher : Elsevier
ISBN 13 : 1483260666
Total Pages : 445 pages
Book Rating : 4.4/5 (832 download)

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Book Synopsis Aeronomy by : P. M. Banks

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.

Collected Papers on Wave Mechanics

Author : Erwin Schrödinger
Publisher : American Mathematical Soc.
ISBN 13 : 0821835246
Total Pages : 226 pages
Book Rating : 4.8/5 (218 download)

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Book Synopsis Collected Papers on Wave Mechanics by : Erwin Schrödinger

Download or read book Collected Papers on Wave Mechanics written by Erwin Schrödinger and published by American Mathematical Soc.. This book was released on 2003 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: The famous equation that bears Erwin Schrödinger's name encapsulates his profound contributions to quantum mechanics using wave mechanics. This third, augmented edition of his papers on the topic contains the six original, famous papers in which Schrödinger created and developed the subject of wave mechanics as published in the original edition. As the author points out, at the time each paper was written the results of the later papers were largely unknown to him. This edition also contains three papers that were written shortly after the original edition was published and four lectures delivered by Schrödinger at the Royal Institution in London in 1928. The papers and lectures in this volume were revised by the author and translated into English, and afford the reader a striking and valuable insight into how wave mechanics developed.

Molecular Mechanics Across Chemistry

Author : Anthony K. Rappé
Publisher : University Science Books
ISBN 13 : 9780935702774
Total Pages : 480 pages
Book Rating : 4.7/5 (27 download)

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Book Synopsis Molecular Mechanics Across Chemistry by : Anthony K. Rappé

Download or read book Molecular Mechanics Across Chemistry written by Anthony K. Rappé and published by University Science Books. This book was released on 1997-05-07 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The remarkable breadth of modern molecular mechanics is covered in this textbook, developed for an undergraduate or first-time course on molecular mechanics. With applications ranging from drug design to homogeneous transition metal catalysis, the book implements a case-study approach designed to give readers exposure to the relevance and utility of molecular mechanics, as well as the opportunity to study a particular problem and its solution in depth.

Aerosol Filtration

Author : Dominique Thomas
Publisher : Elsevier
ISBN 13 : 008102116X
Total Pages : 228 pages
Book Rating : 4.0/5 (81 download)

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Book Synopsis Aerosol Filtration by : Dominique Thomas

Download or read book Aerosol Filtration written by Dominique Thomas and published by Elsevier. This book was released on 2016-11-30 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filtration of aerosols is omnipresent in our daily lives, in areas as diverse as health, the protection of people and the environment, and air treatment inside buildings. However, the collection of particles within a filter media is not, contrary to popular belief, linked to a simple screen effect. The phenomena involved are much more complex and require the consideration of aerosol interactions, filter media and process conditions to select the best fiber filter for a given application. Aerosol Filtration, book for students, hygiene or process engineers, fibrous media manufacturers, designers, and filtration system suppliers or users addresses the filtration of aerosols in six chapters. These chapters cover physics and aerosol characterization, the fibrous media, and efficiency and filter clogging by solid or liquid aerosols, with special attention to the filtration of the nanoparticles. Analyses the behavior of fibrous media against solid and liquid aerosols Presents models of efficiency and pressure drop Introduces computing elements for estimating the lifetime of filters Provides guidance for designing filters and predicting their behavior over time

Hortus Kewensis; Or, A Catalogue of the Plants Cultivated in the Royal Botanic Garden at Kew

Author : William Aiton
Publisher :
ISBN 13 :
Total Pages : 538 pages
Book Rating : 4.A/5 ( download)

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Book Synopsis Hortus Kewensis; Or, A Catalogue of the Plants Cultivated in the Royal Botanic Garden at Kew by : William Aiton

Download or read book Hortus Kewensis; Or, A Catalogue of the Plants Cultivated in the Royal Botanic Garden at Kew written by William Aiton and published by . This book was released on 1812 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Minimum competence in scientific English

Author : Sue Blattes
Publisher : L'Editeur : EDP Sciences
ISBN 13 : 9782868835888
Total Pages : 264 pages
Book Rating : 4.8/5 (358 download)

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Book Synopsis Minimum competence in scientific English by : Sue Blattes

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.

Flexoelectricity in Liquid Crystals

Author : Agnes Buka
Publisher : World Scientific
ISBN 13 : 1848167997
Total Pages : 299 pages
Book Rating : 4.8/5 (481 download)

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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.

X-Ray and Neutron Reflectivity: Principles and Applications

Author : Jean Daillant
Publisher : Springer Science & Business Media
ISBN 13 : 3540486968
Total Pages : 347 pages
Book Rating : 4.5/5 (44 download)

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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.

Popular Astronomy

Author : Camille Flammarion
Publisher :
ISBN 13 :
Total Pages : 732 pages
Book Rating : 4.A/5 ( download)

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Book Synopsis Popular Astronomy by : Camille Flammarion

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:

Quantum Chemistry

Author : Hinne Hettema
Publisher : World Scientific
ISBN 13 : 9789812795762
Total Pages : 522 pages
Book Rating : 4.7/5 (957 download)

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Book Synopsis Quantum Chemistry by : Hinne Hettema

Download or read book Quantum Chemistry written by Hinne Hettema and published by World Scientific. This book was released on 2000 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical physics is presently a very active field, where theoretical computation and accurate experimentation have led to a host of exciting new results. Among these are the possibility of state-to-state reactive scattering, the insights in non-adiabatic chemistry, and, from the computational perspective, the use of explicitly correlated functions in quantum chemistry. Many of these present-day developments use ideas, derivations and results that were obtained in the very early days of quantum theory, in the 1920s and 1930s. Much of this material is hard to study for readers not familiar with German. This volume presents English translations of some of the most important papers. The choice of material is made with the relevance to present-day researchers in mind. Included are seminal papers by M. Born and J.R. Oppenheimer, J. von Neurmann and E. Wigner, E.A. Hylleraas, F. London, F. Hund, H.A. Kramers, R. de L. Kronig and F. Huckel, among others.

Phytochemicals in Nutrition and Health

Author : Mark S. Meskin
Publisher : CRC Press
ISBN 13 : 1420031694
Total Pages : 221 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Phytochemicals in Nutrition and Health by : Mark S. Meskin

Download or read book Phytochemicals in Nutrition and Health written by Mark S. Meskin and published by CRC Press. This book was released on 2002-03-19 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Are soy isoflavones neuroprotective? Just how different is one species of Echinacea from another? Which phytochemicals will be effective as therapeutic agents in vivo? Supported by solid scientific research, Phytochemicals in Nutrition and Health helps provide answers to these and other probing questions concerning the mechanisms of action associat