Download or read book ETUDE THEORIQUE ET SIMULATION NUMERIQUE DES INTERACTIONS ENTRE ATOMES COMPLEXES ET CHAMPS LASER INTENSES written by ALAIN.. CYR and published by . This book was released on 1998 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: POUR PERMETTRE L'ETUDE DES INTERACTIONS ENTRE ATOMES COMPLEXES ET CHAMPS LASER, LA THEORIE R-MATRICE FLOQUET EST L'UNE DES METHODES LES PLUS ADAPTEES ET PROPOSE UN TRAITEMENT AB INITIO, TOTALEMENT NON-PERTURBATIF DE L'INTERACTION ATOME-CHAMP LASER. L'EQUATION DE SCHRODINGER DEPENDANTE DU TEMPS EST RESOLUE DANS LE FORMALISME DE FLOQUET-FOURIER ET NOUS UTILISONS UNE FORME ADEQUATE DE L'INTERACTION SUIVANT LA REGION DE L'ESPACE DES CONFIGURATIONS. CETTE REGION EST DEFINIE PAR LA VALEUR DE LA COORDONNEE RADIALE DE L'ELECTRON POUVANT ETRE EJECTE (THEORIE R-MATRICE). DANS LE BUT D'ETENDRE LA NOUVELLE CHAINE DE PROGRAMME RMATRX2 AUX TRANSITIONS RADIATIVES, NOUS AVONS EFFECTUE D'IMPORTANTS DEVELOPPEMENTS DE LA THEORIE R-MATRICE STANDARD ET R-MATRICE FLOQUET. NOUS NOUS SOMMES INTERESSES AU PHOTODETACHEMENT MULTIPHOTONIQUE DE O# DANS LA CONFIGURATION FONDAMENTALE 2S#22P#4 (#2P#O) CAR L'ETUDE DE CET ION NEGATIF A COUCHE OUVERTE EST TRES DELICAT A SIMULER A CAUSE DE L'IMPORTANCE DES CORRELATIONS ELECTRONIQUES NECESSAIRES A LA DESCRIPTION DU SYSTEME COLLISIONNEL. POUR LE PHOTODETACHEMENT A UN PHOTON, NOUS RESULTATS SONT EN BON ACCORD AVEC LES AUTRES VALEURS EXPERIMENTALES ET THEORIQUES. NOUS PRESENTONS LA PREMIERE ETUDE DU PHOTODETACHEMENT A DEUX PHOTONS DE O# POUR UNE LARGE GAMME DE FREQUENCES. A LA FREQUENCE DU LASER ND : YAG, L'ACCORD AVEC LES DONNEES EXPERIMENTALES EST BON. NOUS AVONS EFFECTUE UNE ETUDE THEORIQUE ET UNE MODELISATION COMPLETES D'UN PHENOMENE TRES RECEMMENT DECOUVERT : LES ETATS DEGENERES INDUITS PAR CHAMP LASER INTENSE. DEUX ETATS ATOMIQUES DE L'ARGON, LE NIVEAU FONDAMENTAL 3S#23P#6 (#1S) ET L'ETAT DOUBLEMENT EXCITE 3S3P#64P (#1P#O), CONNECTES PAR LE CHAMP LASER, PEUVENT ETRE DEGENERES AU SENS DE LA QUASI-ENERGIE (I.E. MEME ENERGIE ET MEME TAUX D'IONISATION) POUR UNE CERTAINE FREQUENCE ET INTENSITE DU CHAMP ELECTROMAGNETIQUE. SUIVANT CERTAINES VALEURS DE CES DEUX PARAMETRES, ON PEUT PARVENIR A UN ECHANGE COMPLET DU ROLE DE CES DEUX ETATS. UNE MODELISATION SIMPLE, RETENANT TOUS LES COUPLAGES ENTRE L'ETAT DOUBLEMENT EXCITE ET UN ETAT FONDAMENTAL VIRTUEL A ETE DEVELOPPEE AFIN DE DEMONTRER LES PRINCIPES PHYSIQUES PRINCIPAUX.
Download or read book DYNAMIQUE DES SYSTEMES ATOMIQUES COMPLEXES EN CHAMP LASER INTENSE written by DAVID.. CHARLO and published by . This book was released on 1999 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS AVONS DEVELOPPE LA THEORIE R-MATRICE-FLOQUET POUR L'ETUDE DES COLLISIONS ELECTRON-ATOME EN CHAMP LASER INTENSE. LA METHODE EST AB INITIO ET NON-PERTURBATIVE, TRAITE EXPLICITEMENT L'ECHANGE ENTRE LES ELECTRONS ET INCLUT UNE DESCRIPTION DE LA CIBLE HABILLEE PAR LES PHOTONS. LA THEORIE A ETE MISE EN UVRE SOUS FORME D'UNE GRANDE CHAINE DE PROGRAMMES GENERAUX ADAPTES AUX ORDINATEURS PARALLELES. NOUS AVONS D'ABORD ETUDIE LA DIFFUSION ELASTIQUE ELECTRON-HYDROGENE ET ELECTRON-HELIUM EN CHAMP LASER CO 2 ( = 10 640 NM) POUR DES INTENSITES ENTRE 1.2 10 5 ET 1.2 10 7 W/CM 2, A BASSE ENERGIE DE COLLISION ET DANS LA GEOMETRIE OU L'ELECTRON EST INCIDENT SUIVANT L'AXE DE POLARISATION DU CHAMP. NOUS AVONS EGALEMENT REALISE DES CALCULS EXACTS DANS LE CAS OU LA CIBLE EST MODELISEE PAR UN POTENTIEL CENTRAL. NOUS MONTRONS QUE LA POLARISATION DE LA CIBLE ATOMIQUE PAR L'ELECTRON COLLISIONNEL ET L'ECHANGE ONT PEU D'EFFETS SUR LES SECTIONS EFFICACES. NOS RESULTATS SONT EN BON ACCORD AVEC LES PREDICTIONS DE LA FORMULE DE L'APPROXIMATION BASSE FREQUENCE (ABF) (KROLL ET WATSON 1973). LES TRES GRANDES VALEURS MESUREES PAR WALLBANK ET HOLMES (1993, 1994) AUX PETITS ANGLES DE DIFFUSION DEMEURENT INEXPLIQUEES. NOUS AVONS ENSUITE ETUDIE L'EXCITATION A BASSE ENERGIE DES QUATRE PREMIERS ETATS EXCITES DE L'HELIUM PAR IMPACT SIMULTANE D'ELECTRON ET DE PHOTONS EN PRESENCE D'UN CHAMP LASER CO 2 (I = 10 8 W/CM 2) OU ND : YAG ( = 1 064 NM, I = 10 1 0 W/CM 2). NOS RESULTATS METTENT EN EVIDENCE DES STRUCTURES ADDITIONNELLES INDUITES PAR LE CHAMP LASER DANS LES SECTIONS EFFICACES D'EXCITATION. EN CHAMP LASER CO 2, NOS CALCULS RENDENT COMPTE DU CARACTERE FORTEMENT NON-PERTURBATIF DU PROCESSUS ET CONFIRMENT LA VALIDITE DE LA THEORIE ABF. ILS SONT PAR AILLEURS EN BON ACCORD QUALITATIF AVEC LES DONNEES EXPERIMENTALES DE WALLBANK ET AL. (1989). EN CHAMP LASER ND : YAG, NOUS MONTRONS QUE LA RESONANCE 2S E (1S2S 2) DE L'ION HE JOUE UN ROLE ESSENTIEL DANS L'EXPLICATION DE LA FORME DU SIGNAL ENREGISTRE PAR LUAN ET AL. (1991).
Download or read book Simulation num rique des processus d excitation et d ionisation de l ion mol culaire d hydrog ne en champ laser intense written by Salima Hennani and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nous présentons dans ce document une étude théorique d'un ion moléculaire diatomique à un électron en interaction avec un champ laser intense. Nous établissons tout d'abord une méthode basée sur les fonctions B-splines permettant de calculer avec précision la structure énergétique totale d'un ion moléculaire homonucléaire ou hétéronucléaire à un seul électron en absence de champ laser. Nous résolvons ensuite numériquement l'équation de Schrödinger dépendante du temps par une approche spectrale pour décrire l'interaction entre l'ion moléculaire H+2 et un champ laser. À l'aide de notre méthode, nous étudions dans un premier temps le processus d'ionisation au-dessus du seuil dans H+2 à différentes intensités lasers. Dans un second temps, nous étudions les processus d'ionisation et d'excitation de l'ion H+2 soumis à une impulsion laser à dérive de fréquence. Nous montrons plus particulièrement l'influence de la dérive de fréquence laser sur le transfert de population de l'état fondamental vers les états liés mis en jeu."-- Sommaire.
Download or read book Etude th orique de l interaction entre un syst me 1 ou 2 lectrons actifs et un champ laser intense written by Éric Cormier and published by . This book was released on 1994 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS PRESENTONS UNE ETUDE DE L'INTERACTION ENTRE UN ATOME ET UN CHAMP LASER INTENSE ET PLUS PARTICULIEREMENT SA MANIFESTATION SOUS FORME DE PROCESSUS MULTIPHOTONIQUES. NOUS DECRIVONS DANS UN PREMIER TEMPS UNE METHODE DE CALCUL DE LA STRUCTURE ATOMIQUE BASEE SUR L'UTILISATION DE FONCTIONS B-SPLINES. NOUS EXPOSONS ENSUITE LES DIFFERENTES THEORIES ADAPTEES A L'ETUDE DE L'IONISATION MULTIPHOTONIQUE A TRAVERS DEUX APPROCHES: UN TRAITEMENT EN THEORIE DES PERTURBATIONS ET UN TRAITEMENT NON PERTURBATIF DEPENDANT DU TEMPS. CHACUNE DE CES THEORIES EST ILLUSTREE DANS L'APPLICATION A UN CAS CONCRET
Download or read book A Guide to the Preventive Conservation of Photograph Collections written by Bertrand Lavédrine and published by Getty Publications. This book was released on 2003 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: A resource for the photographic conservator, conservation scientist, curator, as well as professional collector, this volume synthesizes both the masses of research that has been completed to date and the international standards that have been established on the subject.
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 Reactor Core Materials written by and published by . This book was released on 1960 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Duplex Stainless Steels written by Iris Alvarez-Armas and published by John Wiley & Sons. This book was released on 2013-01-16 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Duplex Stainless Steels (DSSs) are chromium-nickel-molybdenum-iron alloys that are usually in proportions optimized for equalizing the volume fractions of austenite and ferrite. Due to their ferritic-austenitic microstructure, they possess a higher mechanical strength and a better corrosion resistance than standard austenitic steels. This type of steel is now increasing its application and market field due to its very good properties and relatively low cost. This book is a review of the most recent progress achieved in the last 10 years on microstructure, corrosion resistance and mechanical strength properties, as well as applications, due to the development of new grades. Special attention will be given to fatigue and fracture behavior and to proposed models to account for mechanical behavior. Each subject will be developed in chapters written by experts recognized around the international industrial and scientific communities. The use of duplex stainless steels has grown rapidly in the last 10 years, particularly in the oil and gas industry, chemical tankers, pulp and paper as well as the chemical industry. In all these examples, topics like welding, corrosion resistance and mechanical strength properties (mainly in the fatigue domain) are crucial. Therefore, the update of welding and corrosion properties and the introduction of topics like texture effects, fatigue and fracture strength properties, and mechanical behavior modeling give this book specific focus and character.
Download or read book Experimental Chaos written by Stefano Boccaletti and published by A I P Press. This book was released on 2004-12-14 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 8th Experimental Chaos Conference again demonstrated the broad spectrum of areas where nonlinear dynamics plays an important role, such as circuits, hydrodynamics, optics, chemistry, fracture dynamics, neuroscience, and cognitive science. Additional contributions outline the trends for development and application of concepts and techniques of nonlinear dynamics.
Download or read book Robots on the Battlefield written by Ronan Doaré and published by Combat Studies Institute Press. This book was released on 2014 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solid Propellant Rocket Research written by Martin Summerfield and published by Elsevier. This book was released on 2013-11-11 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid Propellant Rocket Research
Download or read book Organic Solid State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
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.
Download or read book Artificial Intelligence in Society written by OECD and published by OECD Publishing. This book was released on 2019-06-11 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The artificial intelligence (AI) landscape has evolved significantly from 1950 when Alan Turing first posed the question of whether machines can think. Today, AI is transforming societies and economies. It promises to generate productivity gains, improve well-being and help address global challenges, such as climate change, resource scarcity and health crises.
Download or read book Government at a Glance Southeast Asia 2019 written by OECD and published by OECD Publishing. This book was released on 2019-09-10 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Government at a Glance Southeast Asia 2019 is the first edition in the Government at a Glance series for the region. It provides the latest available data on public administrations in the 10 ASEAN member countries: Brunei Darussalam, Cambodia, Indonesia, Lao People’s Democratic Republic, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Viet Nam.
Download or read book Genmix written by D Brian Spalding and published by Elsevier. This book was released on 2014-05-18 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genmix: A General Computer Program for Two-dimensional Parabolic Phenomena explains a computer program called GENMIX. The main intention of the program is to be used as a tool of instructions. The name of the program is a mixture of two considerations: its generality and its concern for mixing processes. The book aims to help the potential user to understand the physical and mathematical basis of the topic computer program. It is also the aim of the book to make the program applicable to practical problems. The book is arranged in such a way as to parallel a course of lectures and associated computer-workshop sessions wherein the student is allowed to do some elementary computations as soon as he has gained some knowledge of the method. The book contains the mathematical, physical, and computer-coding aspects of the program. Concepts such as the boundary layer, two-dimensional, and steady- flow are defined and discussed in depth. The text will be a useful tool for computer instructors and students.
Download or read book The Theory of Ionization of Gases by Collision written by Sir John Townsend and published by . This book was released on 1910 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
