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Author: Ahmed Belasri Publisher: Springer Nature ISBN: 9811554447 Category : Technology & Engineering Languages : en Pages : 659
Book Description
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.
Author: DAVID.. JACOB Publisher: ISBN: Category : Languages : fr Pages : 250
Book Description
POUR CARACTERISER LA SENSIBILITE D'UN LASER A DIFFERENTES PERTURBATIONS, LE CONCEPT DE ROBUSTESSE DES ETATS PROPRES EST INTRODUIT. ON MONTRE QUE LA CONSTANTE DE COUPLAGE C ENTRE LES DEUX ETATS PROPRES EST UN PARAMETRE DETERMINANT POUR LA ROBUSTESSE DU SYSTEME. L'ETUDE DE LA ROBUSTESSE ET LE CONTROLE DU COUPLAGE CONDUISENT A DIFFERENTES APPLICATIONS POUR LA MISE AU POINT DE NOUVEAUX SENSEURS OPTIQUES. UNE NOUVELLE SOURCE LASER A DEUX RAIES SIMULTANEES ET RESOLUES SPATIALEMENT EST PRESENTEE ET UTILISEE POUR FAIRE UNE MESURE DIFFERENTIELLE ET ABSOLUE DE TRACES DE METHANE DANS L'ATMOSPHERE. UN EFFET DE LEVIER OPTIQUE EST MIS EN EVIDENCE POUR LA MESURE INTRACAVITE DE TRES FAIBLES ABSORPTIONS DANS UN LASER MONOMODE UTILISE DANS UN REGIME QUASI-CRITIQUE. NOUS PRESENTONS EGALEMENT UNE MESURE DIFFERENTIELLE D'ACTIVITE OPTIQUE DANS UN LASER GRACE A DES ETATS PROPRES PRESENTANT UNE STRUCTURE PARTICULIERE: LES ETATS PROPRES BIHELICOIDAUX. LES ETATS PROPRES DES CAVITES PASSIVES DE GRANDE FINESSE SONT DES SONDES TRES SENSIBLES POUR CARACTERISER LES MIROIRS DE LA CAVITE ET POUR LA MESURE INTRACAVITE D'EFFETS TRES PETITS. DEUX METHODES NOUVELLES ET COMPLEMENTAIRES L'UNE DE L'AUTRE SONT PRESENTEES POUR MESURER LES BIREFRINGENCES RESIDUELLES DE SUPERMIROIRS POUR DIFFERENTS ANGLES D'INCIDENCE. L'UNE, DYNAMIQUE, EST FONDEE SUR L'EVOLUTION TEMPORELLE DE LA POLARISATION D'UNE IMPULSION LUMINEUSE DANS UNE CAVITE, ALORS QUE LA SECONDE, STATIQUE, UTILISE LA LOI EN F#2. LES POTENTIALITES DE CETTE DEUXIEME TECHNIQUE SONT AUSSI ILLUSTREES DANS LE CAS D'UNE CAVITE DE HAUTE FINESSE PAR LA MESURE DE TRES PETITES ROTATIONS FARADAY
Book Description
LE COMPORTEMENT DE LA POLARISATION D'UN LASER A UN OU DEUX ETATS PROPRES STABLES EST ETUDIE, LORSQU'UN ENTRAINEMENT MAGNETIQUE OU OPTIQUE LUI FAIT QUITTER L'EQUILIBRE. UN RETOUR EST D'ABORD EFFECTUE SUR LA CARACTERISATION DES ETATS PROPRES DU LASER A L'EQUILIBRE. DANS CE BUT, LA MATRICE DE JONES D'UNE LAME INCLINEE A FACES PARALLELES EST REDEFINIE EN TENANT COMPTE DES REFLEXIONS INTERNES ET DE LA NATURE GAUSSIENNE DU FAISCEAU INCIDENT. LES DEUX MECANISMES (ROTATION ET INHIBITION) DE BISTABILITE ENTRE ETATS PROPRES CIRCULAIRES SONT ISOLES. EN FAISANT QUITTER SON EQUILIBRE A UN LASER A UN OU DEUX ETATS PROPRES STABLES PAR UN CHAMP MAGNETIQUE CONTINU (ROTATION DE POLARISATION) ET ALTERNATIF (VIBRATION DE POLARISATION), ON OBTIENT DES INSTABILITES DE POLARISATION. LA NOTION DE CHAMP MAGNETIQUE CRITIQUE EFFECTIF EST INTRODUITE POUR DISTINGUER LES FAIBLES AMPLITUDES DE VIBRATION, POUR LESQUELLES IL EXISTE UNE FREQUENCE DE COUPURE, ET LES GRANDES AMPLITUDES DE VIBRATION, ETABLIES AUTOUR DE L'ETAT PROPRE STABLE OU DE L'ETAT PROPRE INSTABLE. LA SUPERPOSITION DE CES DEUX CHAMPS CONDUIT A DES ACCROCHAGES ENTRE LA ROTATION ET LA VIBRATION, REPRESENTES PAR DES LANGUES D'ARNOLD TORSADEES OU QUASI-TORSADEES. COMME CES INSTABILITES VECTORIELLES NE COMPORTENT PAS DE CHAOS, L'ACTIVATION MAGNETIQUE D'UN MAGNETOMETRE LASER EST ETUDIEE POUR CONTOURNER LA FAIBLE ZONE AVEUGLE. L'INJECTION VECTORIELLE, QUI PERMET AUSSI DE SORTIR LE LASER DE SON ETAT D'EQUILIBRE, PERMET DANS LE CAS D'UN LASER ISOTROPE, LE TRANSFERT TOTAL ET L'ENTRAINEMENT DE LA POLARISATION. POUR UN LASER ANISOTROPE, LE TRANSFERT N'A LIEU QUE SUR LES ETATS PROPRES. POUR UN SEUL ETAT PROPRE STABLE, LA NOTION DE LANGUE D'ADLER EST INTRODUITE, ET LE TRANSFERT DE LA POLARISATION SUR L'ETAT INSTABLE PERMET DE SEPARER SIMPLEMENT LES CONTRIBUTIONS DU MAITRE ET DE L'ESCLAVE. POUR DEUX ETATS PROPRES STABLES, LA POLARISATION EXTERIEURE COMMANDE LE BASCULEMENT ENTRE LES ETATS PROPRES S'ILS SONT EN BISTABILITE
Book Description
DANS UNE PREMIERE PARTIE, NOUS ETENDONS LE MODELE STANDARD DU LASER A ELECTRONS LIBRES (LEL) AU CAS D'UN ONDULEUR DONT LE CHAMP MAGNETIQUE N'EST PLUS SIMPLEMENT SINUSOIDAL, MAIS COMPOSE D'UN NOMBRE QUELCONQUE D'HARMONIQUES, ET MONTRONS QUE CETTE GENERALISATION REVIENT SIMPLEMENT A REMPLACER LES COEFFICIENTS DE COUPLAGE USUELS AUX HARMONIQUES LASERS PAR DES COEFFICIENTS GENERALISES. APRES AVOIR INTRODUIT LES MODIFICATIONS INDUITES PAR CE NOUVEAU MODELE DANS SPECTRE, UN CODE DEVELOPPE POUR RESOUDRE LES EQUATIONS DU LEL, NOUS ETUDIONS NUMERIQUEMENT, DANS UNE SECONDE PARTIE, DIFFERENTES CONFIGURATIONS MAGNETIQUES SUSCEPTIBLES DE PRODUIRE UN CHAMP LASER A DEUX HARMONIQUES. NOUS METTONS EN PARTICULIER EN EVIDENCE UNE STRUCTURE A DEUX SECTIONS, LA PREMIERE ETANT DE PERIODE TROIS FOIS PLUS PETITE QUE LA SECONDE, CAPABLE D'ENGENDRER UN RAYONNEMENT A DEUX HARMONIQUES, EN PROPORTIONS CONTINUMENT AJUSTABLES. DANS UNE QUATRIEME PARTIE, NOUS TIRONS PROFIT DE L'INSTALLATION DE BRUYERES-LE-CHATEL, ELSA, DECRITE EN TROISIEME PARTIE, POUR TESTER EXPERIMENTALEMENT UN CERTAIN NOMBRE DE CONCEPTS THEORIQUES. APRES AVOIR VERIFIE LA COHERENCE DES DONNEES FOURNIES PAR LA MACHINE A L'AIDE DE LA RELATION DE RESONANCE DU LEL, NOUS METTONS EN EVIDENCE, CONFORMEMENT AUX PREDICTIONS THEORIQUES ET NUMERIQUES, L'ELARGISSEMENT DES SPECTRES, A FORT RENDEMENT, ET LEUR CONVERGENCE VERS UN REGIME ASYMPTOTIQUE TURBULENT CARACTERISE PAR UNE BRILLANCE DE VALEUR UNIVERSELLE 0,8. NOUS EN PROFITONS POUR NOUS LIVRER AUX PREMIERES VERIFICATIONS EXPERIMENTALES DE LA LOI EXPRIMANT, DANS CE TYPE DE REGIME, LE RENDEMENT EN FONCTION DES DIFFERENTS PARAMETRES DU LEL. ENFIN, NOUS TIRONS PARTI DE LA MOTORISATION DES AIMANTS DE L'ONDULEUR STANDARD D'ELSA POUR ENTREPRENDRE QUELQUES ETUDES PARAMETRIQUES COMPLEMENTAIRES SUR LE TAPERING ET LA GENERATION DE SPECTRES A DEUX COULEURS
Author: Ahmed Belasri Publisher: Springer Nature ISBN: 9811554447 Category : Technology & Engineering Languages : en Pages : 659
Book Description
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.
Author: John Wilfred Orton Publisher: ISBN: 0199695822 Category : Science Languages : en Pages : 529
Book Description
The book is a history of Molecular Beam Epitaxy (MBE) as applied to the growth of semiconductor thin films (note that it does not cover the subject of metal thin films). It begins by examining the origins of MBE, first of all looking at the nature of molecular beams and considering their application to fundamental physics, to the development of nuclear magnetic resonance and to the invention of the microwave MASER. It shows how molecular beams of silane (SiH4) were used to study the nucleation of silicon films on a silicon substrate and how such studies were extended to compound semiconductors such as GaAs. From such surface studies in ultra-high vacuum the technique developed into a method of growing high quality single crystal films of a wide range of semiconductors. Comparing this with earlier evaporation methods of deposition and with other epitaxial deposition methods such as liquid phase and vapour phase epitaxy (LPE and VPE). The text describes the development of MBE machines from the early 'home-made' variety to that of commercial equipment and show how MBE was gradually refined to produce high quality films with atomic dimensions. This was much aided by the use of various in-situ surface analysis techniques, such as reflection high energy electron diffraction (RHEED) and mass spectrometry, a feature unique to MBE. It looks at various modified versions of the basic MBE process, then proceed to describe their application to the growth of so-called 'low-dimensional structures' (LDS) based on ultra-thin heterostructure films with thickness of order a few molecular monolayers. Further chapters cover the growth of a wide range of different compounds and describe their application to fundamental physics and to the fabrication of electronic and opto-electronic devices. The authors study the historical development of all these aspects and emphasise both the (often unexpected) manner of their discovery and development and the unique features which MBE brings to the growth of extremely complex structures with monolayer accuracy.
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher: ISBN: 9789283600046 Category : Aeronautics Languages : en Pages :
Author: Sébastien Forget Publisher: Springer ISBN: 3642367054 Category : Science Languages : en Pages : 179
Book Description
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.
Author: Fabien Bretenaker Publisher: World Scientific ISBN: 9814612421 Category : Science Languages : en Pages : 185
Book Description
This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.
Author: Alan D. Lopez Publisher: World Bank Publications ISBN: 0821362631 Category : Medical Languages : en Pages : 511
Book Description
Strategic health planning, the cornerstone of initiatives designed to achieve health improvement goals around the world, requires an understanding of the comparative burden of diseases and injuries, their corresponding risk factors and the likely effects of invervention options. The Global Burden of Disease framework, originally published in 1990, has been widely adopted as the preferred method for health accounting and has become the standard to guide the setting of health research priorities. This publication sets out an updated assessment of the situation, with an analysis of trends observed since 1990 and a chapter on the sensitivity of GBD estimates to various sources of uncertainty in methods and data.
Author: Ahmed Belasri
Author: DAVID.. JACOB
Author: JEAN-CHARLES.. COTTEVERTE
Author: DANIEL.. TOUATI
Author: Ahmed Belasri
Author: John Wilfred Orton
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Author: Sébastien Forget
Author: Institute of Electrical and Electronics Engineers
Author: Fabien Bretenaker
Author: Alan D. Lopez