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Author : Delphine Phanon
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (125 download)
Download or read book Ingénierie cristalline pour l'optique non linéaire quadratique written by Delphine Phanon and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Delphine Phanon
Publisher :
ISBN 13 :
Total Pages : 355 pages
Book Rating : 4.:/5 (69 download)
Download or read book Ingénierie cristalline pour l'optique non linéaire quadratique written by Delphine Phanon and published by . This book was released on 2006 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: La plupart des matériaux pour l'ONL quadratique actuellement commercialisés sont utilisés pour des applications dans le domaine de l'UV au proche infrarouge. Cependant, l'atmosphère présente deux autres fenêtres de transparence dans l'infrarouge : fenêtre II entre 3 et 5 Μm et fenêtre III entre 8 et 12 Μm. Les matériaux susceptibles de couvrir les besoins pour les applications entre 4 Μm et 12 Μm sont peu nombreux. Les composés d'iodates anhydres étudiés dans ce travail de formule générale M(IO3)n ou MM'(IO3)4 sont synthétisés soit par lente évaporation dans l'acide nitrique concentré soit en synthèse hydrothermale. Les études structurales menées par diffraction des rayons X sur poudre et sur monocristal, mettent en évidence une analogie entre les composés M(IO3)2, M(IO3)3 et a-LiIO3 qui permet l'obtention de solutions solides. Les composés étudiés présentent trois caractéristiques communes importantes : grande stabilité thermique en moyenne 500°C, non hygroscopicité et très grande fenêtre de transparence qui s'étend en continue de l'UV, pour les composés incolores, vers l'infrarouge lointain en moyenne jusqu'à 13 Μm. De plus, ils présentent un seuil de dommage optique sur poudre de l'ordre de quelques GW.cm-2 et l'efficacité en doublement de fréquence est comparable voire supérieure à celle observée pour a-LiIO3. Par ailleurs, l'insertion d'éléments luminescents a pu être réalisée dans certaines de ces matrices. Nous disposons maintenant de toute une famille de matériaux potentiellement actifs (émission laser due à la présence d'éléments luminescents pour les lasers à longueurs d'ondes fixes ou accordables) et/ou passifs (doubleur de fréquence) qui pourraient répondre aux exigences requises pour les applications visées.
Author : Jacques Pécaut
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (489 download)
Download or read book CRYSTAL ENGINEERING OF ORGANIC-INORGANIC MATERIALS FOR QUADRATIC NON-LINEAR OPTIC written by Jacques Pécaut and published by . This book was released on 1994 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: DES CHROMOPHORES NON LINEAIRES, DERIVES DE LA PYRIDINE, SONT ANCRES DANS DES MATRICES MINERALES PAR UN RESEAU DE LIAISONS HYDROGENE COURTES. LES SELS REMARQUABLES QUE NOUS AVONS ISOLE SONT LES DIHYDROGENOARSENIATE, CHLORURE ET BROMURE DE 2-AMINO-5-NITROPYRIDINIUM DONT LES SIGNAUX DE SECOND HARMONIQUE SONT EQUIVALENTS OU SUPERIEURS A CEUX DU 3-METHYL-4-NITROPYRIDINE-N-OXYDE (POM). LES COMPOSES D'ADDITION, CHLORURE DE CADMIUM DE LA BIS (4-NITROPYRIDINE-N-OXYDE) ET LE BIS (BROMURE MERCURIQUE) DE LA 4-NITROPYRIDINE-N-OXYDE POSSEDENT DES STRUCTURES POLAIRES DONT LA COHESION DE L'ENTITE NON LINEAIRE EST ASSUREE A LA FOIS PAR LA LIAISON METAL-OXYGENE ET LA LIAISON HYDROGENE. LEUR REPONSE EN GENERATION DE SECOND HARMONIQUE EST EQUIVALENTE OU SUPERIEURE A CELLE DU KTIOPO#4 (KTP). DES COMPOSES POSSEDANT UN RESEAU CATIONIQUE PSEUDO-CENTROSYMETRIQUE DE DIMETHYLAMINOPYRIDINIUM, DE GUANIDINIUM (CATION OCTUPOLAIRE DE SYMETRIE D#3#H) ET DE DIMETHYLAMMONIUM-STIBAZOLIUM-N-HYDROXYDE SONT DECRITS DANS LA TROISIEME PARTIE DE CE TRAVAIL. CETTE INGENIERIE EST UNE VOIE D'ACCES A DES CRISTAUX NON LINEAIRES MECANIQUEMENT ET CHIMIQUEMENT STABLES. IL S'AVERE QUE LE NOMBRE IMPORTANT DE SITES DONNEURS ET ACCEPTEURS D'HYDROGENE DE LA MATRICE DANS LAQUELLE EST INTEGREE LA MOLECULE ORGANIQUE EST PREPONDERANT DANS L'OBTENTION DE STRUCTURES NON CENTROSYMETRIQUES. CES MATRICES SE PRESENTENT ALORS GENERALEMENT SOUS LA FORME DE CHAINES OU DE COUCHES A CARACTERE POLYMERE
Author : Hosam El-Din M. Saleh
Publisher : BoD – Books on Demand
ISBN 13 : 1789233607
Total Pages : 414 pages
Book Rating : 4.7/5 (892 download)
Download or read book Heavy Metals written by Hosam El-Din M. Saleh and published by BoD – Books on Demand. This book was released on 2018-06-27 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental societal changes resulted from the necessity of people to get organized in mining, transporting, processing, and circulating the heavy metals and their follow-up products, which in consequence resulted in a differentiation of society into diversified professions and even societal strata. Heavy metals are highly demanded technological materials, which drive welfare and progress of the human society, and often play essential metabolic roles. However, their eminent toxicity challenges the field of chemistry, physics, engineering, cleaner production, electronics, metabolomics, botany, biotechnology, and microbiology in an interdisciplinary and cross-sectorial manner. Today, all these scientific disciplines are called to dedicate their efforts in a synergistic way to avoid exposure of heavy metals into the eco- and biosphere, to reliably monitor and quantify heavy metal contamination, and to foster the development of novel strategies to remediate damage caused by heavy metals.
Author :
Publisher : Ed. Techniques Ingénieur
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4./5 ( download)
Download or read book Optique Non Lineaire Quadratique written by and published by Ed. Techniques Ingénieur. This book was released on with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Julien Leroudier
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (8 download)
Download or read book Croissance rapide en solution de cristaux pour l'optique non linéaire quadratique written by Julien Leroudier and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La croissance cristalline de KH2PO4(KDP)and K(H1-xDx)2PO4(DKDP)a été fortement étudiée depuis de nombreuses années. Les propriétés optiques nonlinéaires (conversion de fréquence: doublage pour le KDP et triplage pour le DKDP)et les études fondamentales sur les mécanismes de croissance sont à la base du développement important de la croissance de ces cristaux. Au début des années 90, un fort intérêt s'est porté sur le KDP et DKDP pour les dispositifs optiques à large ouverture pour les applications industrielles de fusion inertielle comme au NAtional Ignition Facility (NIF) aux USA ou pour le laser MégaJoule en France. La dimension de ces optiques (40*40 cm2) nécessite des cristaux géants crûs en solution. Une technique de croissance rapide a été développé par abaissement de température dans un réacteur de 1000L et par une filtration en continu afin d'éviter la nucléation spontanée. Cette méthode est très robuste et fiable pour la croissance rapide de cristaux géants de KDP mais néanmoins montre des limitations inhérentes à cette méthode. En effet, cela mène à des cristaux inhomogènes (défauts, inhomogénéités isotopiques)ce qui est rédhibitoire pour des solutions solides intermédiaires comme le DKDP : la composition en début de croissance peut varier significativement de celle en fin de croissance. Très récemment, des méthodes par circulation de solution en conditions stationnaires ont été développées pour palier à ce problèmeet sont considérées comme les plus pertinentes. C'est pourquoi nous avons développé un système par circulation en conditions stationnaires avec un traitement original de la solution. Dans un premier temps, le système a été testé sur un composé modèle KDP puis dans un deuxième sur le composé utilisé pour l'application DKDP.
Author : CYRIL.. BOURGOGNE
Publisher :
ISBN 13 :
Total Pages : 315 pages
Book Rating : 4.:/5 (492 download)
Download or read book NOUVEAUX MATERIAUX POUR L'OPTIQUE NON LINEAIRE QUADRATIQUE PRESENTANT UNE STRUCTURE NON CENTROSYMETRIQUE STABLE MODELISATION, SYNTHESE, MISE EN UVRE ET CARACTERISATION written by CYRIL.. BOURGOGNE and published by . This book was released on 2000 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE STRATEGIE D'INGENIERIE MOLECULAIRE ASSOCIEE A UNE ETUDE DES PROPRIETES THEORIQUES PAR MODELISATION MOLECULAIRE A ETE DEVELOPPEE AFIN DE CONCEVOIR DE NOUVEAUX MATERIAUX POUR L'OPTIQUE NON-LINEAIRE QUADRATIQUE. NOUS PROPOSONS PLUSIEURS ALTERNATIVES AUX CHROMOPHORES 1D A FORT DIPOLE QUI SONT HABITUELLEMENT UTILISES POUR CES MATERIAUX. TROIS CONCEPTS ONT ETE DEVELOPPES POUR APPORTER UNE STABILISATION DE L'ORGANISATION NON-CENTROSYMETRIQUE MACROSCOPIQUE NECESSAIRE A L'ONL QUADRATIQUE, ET LES RESULTATS THEORIQUES ONT ETE EXPLOITES EN S'APPUYANT SUR LE FORMALISME SPHERIQUE ET LES COMPOSANTES DIPOLAIRES ET OCTUPOLAIRES DU TENSEUR BETA. DES POLYMERES METHACRYLIQUES GREFFES PAR UN CHROMOPHORE DE FORT ENCOMBREMENT STERIQUE DERIVE DU BINAPHTOL ONT ETE PREPARES. LA VARIATION DE LA TEMPERATURE DE TRANSITION VITREUSE EST EN BON ACCORD AVEC LE TAUX DE GREFFAGE ET LA LONGUEUR DE L'ESPACEUR UTILISE. LE CONCEPT DES CHROMOPHORES PUSH-PULL A TRES FAIBLE MOMENT DIPOLAIRE HISTORIQUEMENT INTRODUIT PAR LE POM, A ETE DEVELOPPE PAR LA SYNTHESE DE DERIVES DE PYRIDINE-N-OXYDE POSSEDANT UN TRANSMETTEUR CONJUGUE ALLONGE. LEUR MOMENT DIPOLAIRE THEORIQUE RESTE VOISIN DE 1,5 D POUR CHACUN DES SYSTEMES ETUDIES, TANDIS QUE L'HYPERPOLARISABILITE EST DU MEME ORDRE QUE CELLE D'UN CHROMOPHORE 1D CLASSIQUE DONT LE DIPOLE EST 4 A 8 FOIS PLUS ELEVE. L'INGENIERIE DES CHROMOPHORES OCTUPOLAIRES EST ILLUSTREE PAR LA SYNTHESE DE CARBOCATIONS A SYMETRIE TERNAIRE PLANE DERIVES DU CRISTAL VIOLET. CES CATIONS ATTEIGNENT DES HYPERPOLARISABILITES THEORIQUES TRES ELEVEES ET ONT ETE INCORPORES DANS DES POLYMERES IONIQUES. CE NOUVEAU TYPE DE MATERIAU OUVRE DE GRANDES PERSPECTIVES QUANT AUX APPLICATIONS POSSIBLES. ENFIN, NOUS AVONS PREPARE LE PREMIER CRISTAL ONL A BASE D'UNE ENTITE HYPERPOLARISABLE OCTUPOLAIRE 3D DE TYPE TETRAARYLPHOSPHONIUM EFFICACE EN GENERATION DE SECOND HARMONIQUE.
Author : SHUOXING.. DOU
Publisher :
ISBN 13 :
Total Pages : 147 pages
Book Rating : 4.:/5 (49 download)
Download or read book INTERACTIONS PARAMETRIQUES EN OPTIQUE NON LINEAIRE QUADRATIQUE DANS LES CRISTAUX ORGANIQUES ET ORGANOMETALLIQUES written by SHUOXING.. DOU and published by . This book was released on 1992 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES TRAVAUX PRESENTES ABORDENT LES TROIS ETAPES PRINCIPALES D'ETUDES SUR DES CRISTAUX MASSIFS POUR L'OPTIQUE NON LINEAIRE QUADRATIQUE: CARACTERISATION D'OPTIQUE LINEAIRE ET NON LINEAIRE, ETUDE DES PROPRIETES D'ACCORD DE PHASE, APPLICATIONS POTENTIELLES. LA THEORIE PRECISE DES FRANGES DE MAKER DANS DES CRISTAUX BIAXES A ETE DEVELOPPEE. LES SIX COEFFICIENTS NON LINEAIRES QUADRATIQUES D'UN NOUVEAU CRISTAL ORGANOMETALLIQUE, THIOSEMICARBAZIDE CADMIUM CHLORIDE MONOHYDRATE DU GROUPE PONCTUEL M ONT AINSI ETE MESURES PAR LA METHODE DES FRANGES DE MAKER, LEURS SIGNES RELATIFS ETANT DETERMINES PAR DES METHODES DIFFERENTES. L'ETUDE DES PROPRIETES D'ACCORD DE PHASE DU CRISTAL POUR LA GENERATION DE SECOND HARMONIQUE (GSH) A ETE MENEE A BIEN. LA CONFIGURATION D'ACCORD DE PHASE NON COLINEAIRE DE TYPE I A ETE ETUDIE EN GENERAL. IL A ETE MONTRE AVEC POM COMME EXEMPLE, QUE L'UTILISATION DE LA CONFIGURATION D'ACCORD DE PHASE NON COLINEAIRE A UN FAISCEAU NON CRITIQUE PEUT ETRE BEAUCOUP PLUS EFFICACE QUE LA CONFIGURATION COLINEAIRE EN GSH, SOMME DE FREQUENCES, ET EN AMPLIFICATION ET OSCILLATION PARAMETRIQUES OPTIQUES. L'OSCILLATION PARAMETRIQUE OPTIQUE A ETE REALISEE DANS UN CRISTAL ORGANIQUE DE NPP D'UNE EPAISSEUR DE 1.9 MM, CECI POUR LA PREMIERE FOIS. LA DUREE DE LA POMPE EST D'UNE NANOSECONDE. UNE THEORIE DU SEUIL D'OSCILLATION D'UN OPO IMPULSIONNEL, DE VALIDITE PLUS GENERALE QUE CELLE UTILISEE JUSQU'A PRESENT, EST PRESENTEE
Author : Bo Song
Publisher : Springer
ISBN 13 : 3319224522
Total Pages : 265 pages
Book Rating : 4.3/5 (192 download)
Download or read book Dynamic Behavior of Materials, Volume 1 written by Bo Song and published by Springer. This book was released on 2015-10-23 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.
Author : N. Krishnamurthy
Publisher : PHI Learning Pvt. Ltd.
ISBN 13 : 9788120336667
Total Pages : 280 pages
Book Rating : 4.3/5 (366 download)
Download or read book Engineering Chemistry written by N. Krishnamurthy and published by PHI Learning Pvt. Ltd.. This book was released on 2008 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael Scoullos
Publisher : Springer Science & Business Media
ISBN 13 : 9781402002243
Total Pages : 552 pages
Book Rating : 4.0/5 (22 download)
Download or read book Mercury — Cadmium — Lead Handbook for Sustainable Heavy Metals Policy and Regulation written by Michael Scoullos and published by Springer Science & Business Media. This book was released on 2001-12-31 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although this is a handbook for policy and regulation, the major part of it is filled with data on the three heavy metals that served as examples: mercury, cadmium and lead. Their stocks, productions, prices, trade flows, uses and applications, recovery and recycling, as well as their (eco)toxicological characteristics have been collected and presented to their fullest extent. In addition, they are thoroughly analysed for consistency, future developments and trends and, of course, their consequences for sustainable development and future policy and regulation. The second part, on policy and regulation, begins with an extensive and fundamental consideration on the characteristics of a sustainable heavy metals policy, whereby innovative policy tools are developed. In many aspects, these considerations are also valid for other metals and even non-metallic persistent substances. Addressing the European Union in particular, its policy-making structure and practice are critically analysed, in order to develop feasible and viable guidelines for long-, medium- and short-term EU policy measures. The results of this exercise are then applied to the three heavy metals. In each of these three chapters, all existing EU measures are presented in detail and confronted with better practices elsewhere, resulting in many suggestions and recommendations for the future. In the last chapter, the main conclusions and recommendations are carefully summarised. Together with a very extended table of contents, this makes the book easily accessible, in spite of its volume. This Handbook is a must for policy-makers and administrators at all levels, as well as for their counterparts in a wide variety of industries. In addition, it is well-suited for environmental science courses at academic or higher professional level.
Author : Agnes Buka
Publisher : World Scientific
ISBN 13 : 1848167997
Total Pages : 299 pages
Book Rating : 4.8/5 (481 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (319 download)
Download or read book Satellite Situation Report written by and published by . This book was released on 1978-12 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : L.S. Miller
Publisher : Springer Science & Business Media
ISBN 13 : 1461538181
Total Pages : 549 pages
Book Rating : 4.4/5 (615 download)
Download or read book Electronic Materials written by L.S. Miller and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electronic materials are a dominant factor in many areas of modern technology. The need to understand'them is paramount; this book addresses that need. The main aim of this volume is to provide a broad unified view of electronic materials, including key aspects of their science and technology and also, in many cases, their commercial implications. It was considered important that much of the contents of such an overview should be intelligible by a broad audience of graduates and industrial scientists, and relevant to advanced undergraduate studies. It should also be up to date and even looking forward to the future. Although more extensive, and written specifically as a text, the resulting book has much in common with a short course of the same name given at Coventry Polytechnic. The interpretation of the term "electronic materials" used in this volume is a very broad one, in line with the initial aim. The principal restriction is that, with one or two minor exceptions relating to aspects of device processing, for example, the materials dealt with are all active materials. Materials such as simple insulators or simple conductors, playing only a passive role, are not singled out for consider ation. Active materials might be defined as those involved in the processing of signals in a way that depends crucially on some specific property of those materials, and the immediate question then concerns the types of signals that might be considered.
Author : Heiner Klinkrad
Publisher : Springer Science & Business Media
ISBN 13 : 3540376747
Total Pages : 438 pages
Book Rating : 4.5/5 (43 download)
Download or read book Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.
Author : Jerome V. Moloney
Publisher : Springer Science & Business Media
ISBN 13 : 9780387985817
Total Pages : 270 pages
Book Rating : 4.9/5 (858 download)
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Author : D H Lawrence
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.5/5 (61 download)
Download or read book The Ladybird Illustrated written by D H Lawrence and published by . This book was released on 2020-11-09 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Ladybird is a long tale or novella by D. H. Lawrence. It was first drafted in 1915 as a short story entitled The Thimble. Lawrence rewrote and extended it under a new title in December 1921 and sent the final version to his English agent on 9 January 1922. It was collected with two other tales, The Captain's Doll and The Fox, and the three novellas were then published in London by Martin Secker in March 1923 under the title The Ladybird and in New York by Thomas Seltzer as The Captain's Doll in April 1923."
