Download or read book LASERS A CENTRES COLORES POMPES PAR UN FLASH OU PAR UNE DIODE LASER written by Jean-Louis Doualan and published by . This book was released on 1988 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: UN LASER UTILISANT UNE LAMPE FLASH A ETE CONSTRUIT. IL FONCTIONNE AVEC LES CENTRES F::(2)**(+) DANS LIF A 77 K, F::(2)**(+) DANS NAF ET (F::(2)**(+))::(A) DANS NAF:LI**(+) A TEMPERATURE AMBIANTE. NOUS AVONS ETUDIE LES CARACTERISTIQUES LASERS. L'ETUDE A ETE POUSSEE PLUS LOIN POUR LE CENTRE F::(2)**(+) DANS LIF AVEC DES MESURES SUR LES EFFETS D'ECHAUFFEMENT, LE GAIN ET LES PERTES DANS LE MATERIAU. POUR LA PREMIERE FOIS NOUS AVONS UTILISE UNE DIODE LASER POUR POMPER DES CENTRES COLORES. LE LASER AINSI OBTENU EST PEU ENCOMBRANT ET MOINS ONEREUX QUE LE POMPAGE PAR DEUX LASERS EN TANDEM NECESSAIRE POUR LE POMPAGE DES CENTRES (F::(2)**(+))**(*) DANS NAF:MG**(2+). L'EMISSION CONTINUE A 77 K EST ACCORDABLE ENTRE 1,03 ET 1,12 MU M, LA PUISSANCE MAXIMUM EST DE 8,1 MW POUR 400 MW DE POMPE

Download or read book LASERS A CENTRES COLORES POMPES PAR DIODES LASERS written by KHALED.. MAZIGHI and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: L'AMELIORATION D'UN LASER A CENTRES COLORES UTILISANT LE FLUORURE DE SODIUM DOPE AU MAGNESIUM POMPE PAR UNE DIODE LASER DE PUISSANCE, A ETE ACCOMPLIE. CE LASER DELIVRE ACTUELLEMENT 35 MILLIWATTS EN EMISSION CONTINUE SOUS 480 MILLIWATTS DE POMPE POUR UN MIROIR DE SORTIE DE 4 POURCENT DE TRANSMISSION, ET PEUT ETRE ACCORDE ENTRE 1009 ET 1175 NANOMETRES POUR UNE TRANSMISSION DE 0,5% DE SON MIROIR DE SORTIE; LES CENTRES ACTIFS NE SONT PAS SEVEREMENT BLANCHIS PAR CE MODE DE POMPAGE. LE BLOCAGE DES MODES LONGITUDINAUX DE CE LASER A ETE REALISE PAR DEUX METHODES SIMPLES QUI NE NECESSITENT L'INTRODUCTION D'AUCUN ELEMENT INTRACAVITE. L'UNE CONSISTE A MODULER ELECTRIQUEMENT LA DIODE LASER PAR UN SIGNAL SINUSOIDAL HAUTE FREQUENCE D'ORIGINE EXTERNE, ET L'AUTRE UTILISE UN SYSTEME DE BOUCLE DE REACTION OPTO-ELECTRONIQUE OU UNE FRACTION DE LA LUMIERE EMISE SERT A ASSERVIR LA DIODE LASER DE POMPE. UN LASER A CENTRES COLORES UTILISANT LE BROMURE DE POTASSIUM DOPE A L'OXYGENE EMETTANT VERS 2 MICROMETRES A ETE CONSTRUIT ET MISE EN UVRE AVEC POUR SOURCE DE POMPAGE UN AUTRE LASER A CENTRES COLORES. C'EST UNE PREMIERE ETAPE DE LA REALISATION D'UN LASER A CENTRES COLORES, POMPE PAR UNE DIODE LASER PULSEE A 1,55 MICROMETRES

Download or read book POMPAGE PAR DIODE LASER DE LASERS A CENTRES COLORES EMETTANT AU VOISINAGE DE 1 5M written by ADAMA.. KONATE and published by . This book was released on 1995 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS AVONS ETENDU LE DOMAINE SPECTRAL COUVERT PAR LES LASERS A CENTRES COLORES (LCC) POMPES PAR DIODE LASER EN UTILISANT DEUX DIODES LASER EMETTANT RESPECTIVEMENT A 962 ET 993NM POUR EXCITER LES CENTRES TL (1) DANS KCL:TL#+ ET NACL:TL#+ ET LES CENTRES (F#2#+)#H DANS NACL:OH#-. AVEC KCL:TL#+ L'EMISSION EST ACCORDABLE DE 1488 A 1542NM, AVEC NACL:TL#+ DE 1493 A 1540NM. LE LASER A CENTRES (F#2#+)#H DANS NACL:OH#- EST PLUS PERFORMANT. AVEC 695MW DE LA DIODE A 993NM, NOUS OBTENONS 25MW ET UNE LARGE PLAGE D'ACCORD ALLANT DE 1480 A 1680NM. CES DIFFERENTS LASERS PEUVENT SERVIR, PAR EXEMPLE, A DES MESURES SPECTROSCOPIQUES SUR DES MATERIAUX LASER DOPES AVEC DES IONS TERRES RARES. L'EMISSION DES CENTRES (F#2#+)#H EST LIMITEE PAR DES PHENOMENES DE REORIENTATION CAUSES PAR L'INTENSE LUMIERE DE POMPAGE. NOUS AVONS SYSTEMATIQUEMENT EXAMINE CET EFFET, AINSI QUE LA FACON DE LE COMBATTRE PAR UNE LUMIERE AUXILIAIRE, DITE DE REGENERATION. CETTE ETUDE A ETE FAITE D'UNE PART DE FACON PUREMENT SPECTROSCOPIQUE ET D'AUTRE PART EN ETUDIANT L'EMISSION D'UN LCC POMPE SOIT PAR UNE DIODE LASER, SOIT, PAR UN LASER ND:YAG. NOUS AVONS MONTRE QU'A COTE DE LA REORIENTATION DES CENTRES (F#2#+)#H PAR LA LUMIERE DE POMPE INTERVIENT UNE DESTRUCTION DE CES MEMES CENTRES, HEUREUSEMENT ENTIEREMENT RENVERSABLE SOUS L'EFFET DE LA LUMIERE AUXILIAIRE. ENFIN, NOUS AVONS OBTENU, POUR LA PREMIERE FOIS, L'EMISSION LASER CONTINUE ACCORDABLE DE LA VARIETE A (ET NON PLUS B) DES CENTRES (F#2#+)#H DANS NACL:OH#-(A 30K, EN POMPANT PAR UN LASER ND:YAG)

Download or read book Lasers centres color s dans les domaines written by Denis Mounier and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Le pompage par un flash à xénon de deux lasers à centres colorés a été réalisé. Il s'agit des centres (F#2#+)* de NAF : MG#2#+ et (F#2#+)#H de NACL:OH#. Ces deux lasers peuvent fonctionner à température ambiante: leur émission se fait alors dans les domaines 1,05-1,27 M pour (F#2#+)* et 1,52-1,76 M pour (F#2#+)#H. Des impulsions laser de 10 S et de plusieurs MJ, pour 10J d'énergie électrique de pompe, ont été obtenus. Les centres (F#2#+)* sont sévèrement blanchis par la lumière du flash mais ils peuvent néanmoins délivrer plus de 100.000 impulsions à 300 K. Leur endurance n'apparaît pas nettement améliorée lorsqu'on abaisse la température du cristal à 77 K. Quant aux centres (F#2#+)#H, leur endurance aux coups de flash répétés est meilleure que celle des centres (F#2#+)* dès que la température du cristal est inférieure a 0C.

Download or read book Experimental Aerodynamics written by Stefano Discetti and published by CRC Press. This book was released on 2017-03-16 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental Aerodynamics provides an up to date study of this key area of aeronautical engineering. The field has undergone significant evolution with the development of 3D techniques, data processing methods, and the conjugation of simultaneous measurements of multiple quantities. Written for undergraduate and graduate students in Aerospace Engineering, the text features chapters by leading experts, with a consistent structure, level, and pedagogical approach. Fundamentals of measurements and recent research developments are introduced, supported by numerous examples, illustrations, and problems. The text will also be of interest to those studying mechanical systems, such as wind turbines.

Download or read book Turbulent Reactive Flows written by R. Borghi and published by Springer. This book was released on 2012-10-20 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent reactive flows are of common occurrance in combustion engineering, chemical reactor technology and various types of engines producing power and thrust utilizing chemical and nuclear fuels. Pollutant formation and dispersion in the atmospheric environment and in rivers, lakes and ocean also involve interactions between turbulence, chemical reactivity and heat and mass transfer processes. Considerable advances have occurred over the past twenty years in the understanding, analysis, measurement, prediction and control of turbulent reactive flows. Two main contributors to such advances are improvements in instrumentation and spectacular growth in computation: hardware, sciences and skills and data processing software, each leading to developments in others. Turbulence presents several features that are situation-specific. Both for that reason and a number of others, it is yet difficult to visualize a so-called solution of the turbulence problem or even a generalized approach to the problem. It appears that recognition of patterns and structures in turbulent flow and their study based on considerations of stability, interactions, chaos and fractal character may be opening up an avenue of research that may be leading to a generalized approach to classification and analysis and, possibly, prediction of specific processes in the flowfield. Predictions for engineering use, on the other hand, can be foreseen for sometime to come to depend upon modeling of selected features of turbulence at various levels of sophistication dictated by perceived need and available capability.

Download or read book Enter the Ninja Sudoku written by Frank Longo and published by Sterling Publishing Company. This book was released on 2007-03 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sudoku is the martial art of puzzles. This book presents a collection of energetic enigmas and numerical conundrums. It is suitable for solvers on the go and for anyone and everyone.

Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pressure and Temperature Sensitive Paints written by Tianshu Liu and published by Springer Science & Business Media. This book was released on 2006-01-06 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Luminescent molecule sensors, called pressure-sensitive paint (PSP) and temperature-sensitive paint (TSP), measure factors essential for understanding the aerodynamic performance and heat transfer characteristics of flight vehicles. They provide a powerful tool for experimental aerodynamicists to obtain a deeper understanding of the rich physical phenomena in complex flows around a flight vehicle. This book helps the reader to understand the physics and chemistry and the capabilities of PSP and TSP. It provides an overview of the wide scope of applications and explains the system requirements for using these sensors. The book also includes an extensive table of properties of PTP and TSP. As such, it is a thorough and up-to-date coverage of the underlying physics and applications of luminescent molecules designed for global pressure and temperature mapping

Download or read book IELTS Testbuilder written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Paddy Bogside written by Paddy Doherty and published by Mercier Press. This book was released on 2001 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: A carpenter and builder by trade, Paddy Doherty was strongly active in the Civil Rights agitation of the late 1960s and early 1970s and was on occasion a victim of police brutality. A radical and trade unionist, this is his story as he gives an account of his life in the city of Derry.

Download or read book Alphaherpesviruses written by Sandra Knowles Weller and published by Caister Academic Press Limited. This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alphaherpesviruses are a fascinating group of DNA viruses that includes important human pathogens such as herpes simplex virus type 1 (HSV-1), HSV-2, and varicella-zoster virus (VZV): the causative agents of cold sores, genital ulcerous disease, and chickenpox/shingles, respectively. A key attribute of these viruses is their ability to establish lifelong latent infection in the peripheral nervous system of the host. Such persistence requires subversion of the host's immune system and intrinsic antiviral defense mechanisms. Understanding the mechanisms of the immune evasion and what triggers viral reactivation is a major challenge for today's researchers. This has prompted enormous research efforts into understanding the molecular and cellular biology of these viruses. This up-to-date and comprehensive volume aims to distill the most important research in this area providing a timely overview of the field. Topics covered include: transcriptional regulation, DNA replication, translational control, virus entry and capsid assembly, the role of microRNAs in infection and oncolytic vectors for cancer therapy. In addition there is coverage of virus-host interactions, including apoptosis, subversion of host protein quality control and DNA damage response pathways, autophagy, establishment and reactivation from latency, interferon responses, immunity and vaccine development. Essential reading for everyone working with alphaherpesviruses and of interest to all virologists working on latent infections.

Download or read book Report on Procurement written by United States. Department of Defense. Advisory Committee on Fiscal Organization and Procedures and published by . This book was released on 1954 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analecta Or Materials For a History of Remarkable Providences Mostly Relating to Scotch Ministers and Christians written by Robert Wodrow and published by BoD – Books on Demand. This book was released on 2024-05-25 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1842.

Download or read book Unidentified written by Robert Salas and published by Career Press. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1969 the U.S. Air Force issued a statement that read' "No UFO reported, investigated and evaluated by the Air Force was ever an indication of threat to our national security." This statement is patently false. It has been proven untrue by the testimony of many military officers and airmen and documentation of incidents involving UFOs and nuclear weapons, testimonies of which the U.S. Air Force was fully aware. Unidentified details many of these testimonies, some for the first time. As partial justification for its position, the Air Force cites a University of Colorado study that was contracted and paid for by federal funds. Unidentified reveals how this study was actually just another part of the plan to cover up the reality of the UFO phenomenon. For the first time, Unidentified publishes evidence that the investigators for the Colorado study knew about the UFO-related missile shutdown incidents but did not investigate them or include them in their final report.

Download or read book HIE ISOLDE the Technical Options written by European Organization for Nuclear Research and published by . This book was released on 2006 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Information Technology Home Electronic System HES Architecture written by and published by . This book was released on 2018 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: