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Author: François Herlemont Publisher: ISBN: Category : Languages : fr Pages : 303
Book Description
La spectroscopie haute résolution dans la cavité d'un laser à C02 est une méthode de spectroscopie utilisée maintenant dans divers laboratoires. La mise au point de laser à C02 guide d'onde ayant des caractéristiques fort différentes des lasers à onde libre nous a conduit à exploiter ses spécificités en spectroscopie intracavité haute résolution. Deux types de spectroscopie subDoppler ont ainsi été développés: - La spectroscopie de saturation. Dans ce cas, c'est la gamme d'accord importante du laser à C02 guide d'onde qui est exploitée. Le Bromure de Methyle a servi de gaz test. Les nombreuses observations ont permis une analyse détaillée de la bande de vibration v6 des deux espèces isotopiques. - La spectroscopie à deux photons à effet Doppler compensé. Cette technique de spectroscopie haute résolution est surtout utilisée dans le domaine visible. Son extension au domaine infrarouge n'est pas sans poser de problèmes. Nous montrons comment la disposition intracavité du gaz absorbant associée à l'utilisation d'un amplificateur à C02 guide d'onde réalise un compromis entre les différents paramètres intervenant dans le processus d'absorption à deux photons (densité de puissance gamme d'accord, résolution). Nous avons appliqué cette méthode de spectroscopie à l'étude de la bande de vibration v3 = 0 + v3 = 2 de SF6, molécule type pour les expériences d'excitation multiphotonique. Par ailleurs, une nouvelle voie de recherche permettant 1'étude d'absorption à deux photons a été mise au point : le gaz absorbant est placé dans une cavité passive en dehors de cette cavité laser. Cette configuration originale fournit une phénoménologie riche dont les principaux aspects sont abordés. Au cours de ces études, de nombreux effets ont été observés et analysés: régime de Q-switch (automodulation de la puissance laser), régime de bistabilité d'absorption, de bistabilité dispersive, dispersion à deux photons.
Author: François Herlemont Publisher: ISBN: Category : Languages : fr Pages : 303
Book Description
La spectroscopie haute résolution dans la cavité d'un laser à C02 est une méthode de spectroscopie utilisée maintenant dans divers laboratoires. La mise au point de laser à C02 guide d'onde ayant des caractéristiques fort différentes des lasers à onde libre nous a conduit à exploiter ses spécificités en spectroscopie intracavité haute résolution. Deux types de spectroscopie subDoppler ont ainsi été développés: - La spectroscopie de saturation. Dans ce cas, c'est la gamme d'accord importante du laser à C02 guide d'onde qui est exploitée. Le Bromure de Methyle a servi de gaz test. Les nombreuses observations ont permis une analyse détaillée de la bande de vibration v6 des deux espèces isotopiques. - La spectroscopie à deux photons à effet Doppler compensé. Cette technique de spectroscopie haute résolution est surtout utilisée dans le domaine visible. Son extension au domaine infrarouge n'est pas sans poser de problèmes. Nous montrons comment la disposition intracavité du gaz absorbant associée à l'utilisation d'un amplificateur à C02 guide d'onde réalise un compromis entre les différents paramètres intervenant dans le processus d'absorption à deux photons (densité de puissance gamme d'accord, résolution). Nous avons appliqué cette méthode de spectroscopie à l'étude de la bande de vibration v3 = 0 + v3 = 2 de SF6, molécule type pour les expériences d'excitation multiphotonique. Par ailleurs, une nouvelle voie de recherche permettant 1'étude d'absorption à deux photons a été mise au point : le gaz absorbant est placé dans une cavité passive en dehors de cette cavité laser. Cette configuration originale fournit une phénoménologie riche dont les principaux aspects sont abordés. Au cours de ces études, de nombreux effets ont été observés et analysés: régime de Q-switch (automodulation de la puissance laser), régime de bistabilité d'absorption, de bistabilité dispersive, dispersion à deux photons.
Author: Michel Lyszyk Publisher: ISBN: Category : Languages : fr Pages : 178
Book Description
ETUDE DU COMPORTEMENT D'UN MELANGE GAZEUX CO::(2)-N::(2)-HE EXCITE PAR UNE DECHARGE CONTINUE EN VUE DE METTRE EN EVIDENCE LES CONDITIONS A REALISER POUR OBTENIR DES ELARGISSEMENTS DE PROFIL DE L'ORDRE DU GHZ. DESCRIPTION DE DEUX REALISATION EXPERIMENTALES: TUBE PYREX, TUBE EN OXYDE DE BE. APPLICATIONS SPECTROSCOPIQUES
Author: G.C. Papageorgiou Publisher: Springer Science & Business Media ISBN: 1402032188 Category : Science Languages : en Pages : 853
Book Description
Chlorophyll a Fluorescence: A Signature of Photosynthesis highlights chlorophyll (Chl) a fluorescence as a convenient, non-invasive, highly sensitive, rapid and quantitative probe of oxygenic photosynthesis. Thirty-one chapters, authored by 58 international experts, provide a solid foundation of the basic theory, as well as of the application of the rich information contained in the Chl a fluorescence signal as it relates to photosynthesis and plant productivity. Although the primary photochemical reactions of photosynthesis are highly efficient, a small fraction of absorbed photons escapes as Chl fluorescence, and this fraction varies with metabolic state, providing a basis for monitoring quantitatively various processes of photosynthesis. The book explains the mechanisms with which plants defend themselves against environmental stresses (excessive light, extreme temperatures, drought, hyper-osmolarity, heavy metals and UV). It also includes discussion on fluorescence imaging of leaves and cells and the remote sensing of Chl fluorescence from terrestrial, airborne, and satellite bases. The book is intended for use by graduate students, beginning researchers and advanced undergraduates in the areas of integrative plant biology, cellular and molecular biology, plant biology, biochemistry, biophysics, plant physiology, global ecology and agriculture.
Author: Terry T. Schaeffer Publisher: Getty Publications ISBN: 0892366451 Category : Art Languages : en Pages : 221
Book Description
The impact of light on works of art and archival materials has long been an issue of concern to conservators and other museum professionals, yet the literature on this subject has never been systematically reviewed. This volume fills that gap by providing a survey of the impact of exposure to light with an emphasis on photoflash and reprographic sources. The information provided will assist the professional audience, especially conservators and collections managers, in assessing the risk to art and archival objects of such exposures. The text surveys relevant photophysical and photochemical principles, photometric and radiometric measurement, and the spectral outputs of several light sources. Materials discussed include colorants and natural fibers; pulp, paper, and wood; natural and synthetic polymers; fluorescent whitening agents; photographic and reprographic materials; and objects containing combinations of materials. Approximations and assumptions used in the evaluation process are discussed in some detail, with examples of the different types of calculations. The Research in Conservation reference series presents the findings of research conducted by the Getty Conservation Institute and its individual and institutional research partners, as well as state-of-the-art reviews of conservation literature. Each volume covers a topic of current interest to conservators and conservation scientists.
Author: Marc Pansu Publisher: Springer Science & Business Media ISBN: 3540312110 Category : Science Languages : en Pages : 996
Book Description
This handbook is a reference guide for selecting and carrying out numerous methods of soil analysis. It is written in accordance with analytical standards and quality control approaches. It covers a large body of technical information including protocols, tables, formulae, spectrum models, chromatograms and additional analytical diagrams. The approaches are diverse, from the simplest tests to the most sophisticated determination methods.
Author: Rodger Talbert Publisher: CRC Press ISBN: 1420017780 Category : Mathematics Languages : en Pages : 242
Book Description
Modern paints and coatings offer an astounding variety of formulations that are used to improve the durability, appearance, and lifespan of countless products. From cars to furniture, computers, and mechanical components, paints and coatings play a vital role in nearly every manufactured product available. Straightforward Guidance for Dev
Author: Victor R Preedy Publisher: Academic Press ISBN: 012800827X Category : Medical Languages : en Pages : 1382
Book Description
Handbook of Cannabis and Related Pathologies: Biology, Pharmacology, Diagnosis, and Treatment is the first book to take an interdisciplinary approach to the understanding of cannabis use and misuse. Recent worldwide trends toward decriminalizing marijuana for medical use have increased legal use of the drug and recreational use remains high, making cannabis one of the most commonly used drugs. Cannabis has a wide range of adverse neurological effects, and use and abuse can lead to physical, social, and psychopathological issues that are multifarious and complex. Effective understanding and treatment requires knowledge of the drug's effects from across scientific disciplines. This book provides an overview of the biological and pharmacological components of the cannabis plant, outlines its neurological, social, and psychopathological effects, assists in the diagnosis and screening for use and dependency, and aids researchers in developing effective treatments for cannabis-related issues and disorders. Fully illustrated, with contributions from internationally recognized experts, it is the go-to resource for neuroscientists, pharmacologists, pathologists, public-health workers, and any other researcher who needs an in-depth and cross-disciplinary understanding of cannabis and its effects. - Comprehensive chapters include an abstract, key facts, mini dictionary of terms, and summary points - Presents illustrations with at least six figures, tables, and diagrams per chapter - Provides a one-stop-shopping synopsis of everything to do with cannabis and its related pathology, from chemicals and cells, individuals and communities, and diagnosis and treatment - Offers an integrated and informed synopsis of the complex issues surrounding cannabis as a substance, its use, and its misuse
Author: Timothy J Mason Publisher: Woodhead Publishing ISBN: 1782420622 Category : Science Languages : en Pages : 166
Book Description
This updated version of Practical Sonochemistry for advanced students and teachers in chemistry and chemical engineering conveys the increasing growth in applications and equipment to power ultrasound. Equipment now on the market offers a wider range of frequencies with more reproducible experimentation and a variety of scale-up systems. The book provides detailed descriptions of newer ultrasonic equipment and its applications, and practical laboratory uses of ultrasound technology for industrial scale performance.Modern exercises familiarise readers with recent sonochemical operations. The book also includes methods for estimating ultrasonic energy entering the system (dosimetry), which will standardise sonochemical methodology and enable practitioners to reproduce results from other laboratories. - Conveys the increasing growth in applications and equipment to power ultrasound - Provides detailed descriptions of new ultrasonic equipment and its applications and practical laboratory uses of ultrasound technology for industrial scale performance - Includes methods for estimating ultrasonic energy entering the system (dosimetry), which will standardise sonochemical methodology and enable practitioners to reproduce results from other laboratories
Author: Lee Tin Sin Publisher: William Andrew ISBN: 1437744591 Category : Technology & Engineering Languages : en Pages : 351
Book Description
Annotation An essential reference for engineers, scientists and product designers that already work with polymers and plastics who wish to convert to a sustainable plastic. It covers the properties, synthesis and polymerisation of PLA and processing techniques involved in fabricating parts from this polymer.
Author: François Herlemont
Author: François Herlemont
Author: Michel Lyszyk
Author: Cristina Secades
Author: G.C. Papageorgiou
Author: Terry T. Schaeffer
Author: Marc Pansu
Author: Rodger Talbert
Author: Victor R Preedy
Author: Timothy J Mason
Author: Lee Tin Sin