Download or read book ETUDE DE LA MICROABLATION LASER A PRESSION ATMOSPHERIQUE EN VUE DE LA CARTOGRAPHIE ELEMENTAIRE written by Christian Gertsen and published by . This book was released on 1996 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJECTIF PRINCIPAL DE CETTE THESE ETAIT L'EXTENSION DE LA TECHNIQUE D'ANALYSE PAR SPECTROMETRIE D'EMISSION OPTIQUE SUR PLASMA PRODUIT PAR LASER (SEO-PPL) A LA MICROANALYSE (DIAMETRE DE LA ZONE ETUDIEE 5 A 10 MICROMETRES). CETTE REDUCTION DE UN OU DEUX ORDRES DE GRANDEUR DES DIMENSIONS LINEAIRE DE LA TACHE FOCALE DU LASER S'ACCOMPAGNE DE CHANGEMENTS DANS LA PHYSIQUE DE L'INTERACTION LASER-MATIERE PAR RAPPORT AUX SITUATIONS MIEUX CONNUES DE LA MACROABLATION (DIAMETRE D'INTERACTION SIGNIFICATIVEMENT SUPERIEUR A 100 MICROMETRES), CAR LES GRADIENTS INITIAUX DE TEMPERATURE, PRESSION ET DENSITE SONT TRES GRANDS. LE MANUSCRIT EST ESSENTIELLEMENT PARTAGE EN DEUX PARTIES: UNE PREMIERE PARTIE MELANT DONNEES DE LA LITTERATURE ET RESULTATS EXPERIMENTAUX PERMETTANT DE DECRIRE ET COMPRENDRE LE PHENOMENE D'ABLATION. LES POINTS SUIVANTS SONT ABORDES: ? INTERPRETATION DU PHENOMENE D'ABLATION AVEC UN LASER ULTRAVIOLET ET EXPLICATION DE LA STOECHIOMETRIE DE L'ABLATION ? RENDEMENT D'ABLATION TRES ELEVE EN MICROANALYSE ? MISE EN EVIDENCE D'UN REGIME STATIONNAIRE ET ISOTHERME D'ABLATION ? CARTOGRAPHIE EN TROIS DIMENSIONS DE LA TEMPERATURE D'EXCITATION ET DE LA DISTRIBUTION LOCALE DE PRESSION ET D'ATOMES DANS LE PLASMA ? EXPLICATION DU RESULTAT EXPERIMENTAL SELON LEQUEL L'ONDE ACOUSTIQUE EST PROPORTIONNELLE A LA MASSE ABLATEE. LA DEUXIEME PARTIE DU MANUSCRIT EST CONSACREE A L'APPLICATION DE LA TECHNIQUE LA MICROANALYSE. LE DISPOSITIF UTILISE PERMET D'ATTEINDRE UNE RESOLUTION LATERALE DE 6 A 8 MICROMETRES ET DES LIMITES DE DETECTION DE 1 A 100 MICROGRAMMES PAR GRAMME. LES DROITES D'ETALONNAGE OBTENUES MONTRENT QUE LES EFFETS DE MATRICE SONT LIMITES

Download or read book ETUDE DE LA MICROABLATION LASER A PRESSION ATMOSPHERIQUE EN VUE DE LA CARTOGRAPHIE ELEMENTAIRE written by Christian Gertsen and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJECTIF PRINCIPAL DE CETTE THESE ETAIT L'EXTENSION DE LA TECHNIQUE D'ANALYSE PAR SPECTROMETRIE D'EMISSION OPTIQUE SUR PLASMA PRODUIT PAR LASER (SEO-PPL) A LA MICROANALYSE (DIAMETRE DE LA ZONE ETUDIEE 5 A 10 MICROMETRES). CETTE REDUCTION DE UN OU DEUX ORDRES DE GRANDEUR DES DIMENSIONS LINEAIRE DE LA TACHE FOCALE DU LASER S'ACCOMPAGNE DE CHANGEMENTS DANS LA PHYSIQUE DE L'INTERACTION LASER-MATIERE PAR RAPPORT AUX SITUATIONS MIEUX CONNUES DE LA MACROABLATION (DIAMETRE D'INTERACTION SIGNIFICATIVEMENT SUPERIEUR A 100 MICROMETRES), CAR LES GRADIENTS INITIAUX DE TEMPERATURE, PRESSION ET DENSITE SONT TRES GRANDS. LE MANUSCRIT EST ESSENTIELLEMENT PARTAGE EN DEUX PARTIES: UNE PREMIERE PARTIE MELANT DONNEES DE LA LITTERATURE ET RESULTATS EXPERIMENTAUX PERMETTANT DE DECRIRE ET COMPRENDRE LE PHENOMENE D'ABLATION. LES POINTS SUIVANTS SONT ABORDES: ? INTERPRETATION DU PHENOMENE D'ABLATION AVEC UN LASER ULTRAVIOLET ET EXPLICATION DE LA STOECHIOMETRIE DE L'ABLATION ? RENDEMENT D'ABLATION TRES ELEVE EN MICROANALYSE ? MISE EN EVIDENCE D'UN REGIME STATIONNAIRE ET ISOTHERME D'ABLATION ? CARTOGRAPHIE EN TROIS DIMENSIONS DE LA TEMPERATURE D'EXCITATION ET DE LA DISTRIBUTION LOCALE DE PRESSION ET D'ATOMES DANS LE PLASMA ? EXPLICATION DU RESULTAT EXPERIMENTAL SELON LEQUEL L'ONDE ACOUSTIQUE EST PROPORTIONNELLE A LA MASSE ABLATEE. LA DEUXIEME PARTIE DU MANUSCRIT EST CONSACREE A L'APPLICATION DE LA TECHNIQUE LA MICROANALYSE. LE DISPOSITIF UTILISE PERMET D'ATTEINDRE UNE RESOLUTION LATERALE DE 6 A 8 MICROMETRES ET DES LIMITES DE DETECTION DE 1 A 100 MICROGRAMMES PAR GRAMME. LES DROITES D'ETALONNAGE OBTENUES MONTRENT QUE LES EFFETS DE MATRICE SONT LIMITES

Download or read book ETUDE DES PARAMETRES DE L INTERACTION LASER CIBLE QUI INFLUENCENT LA COMPOSITION DU PLASMA CREE PAR ABLATION LASER EN VUE DE L ANALYSE ELEMENTAIRE QUANTITATIVE DES MATERIAUX written by CORINNE.. NOUVELLON and published by . This book was released on 1999 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ABLATION LASER COUPLEE A LA SPECTROMETRIE D'EMISSION OPTIQUE EST UNE TECHNIQUE A FORT POTENTIEL POUR L'ANALYSE ELEMENTAIRE DE MATERIAUX CAR ELLE POSSEDE PEU DE CONTRAINTES DE MISE EN UVRE ET EST UTILISABLE POUR DE NOMBREUX MATERIAUX. LE PRINCIPE CONSISTE A ANALYSER L'INTENSITE EMISE LORS DE LA DESEXCITATION DES ESPECES DU PLASMA CREE PAR FOCALISATION D'UN FAISCEAU LASER SUR L'ECHANTILLON A ANALYSER. POUR QUE L'ANALYSE ELEMENTAIRE SOIT QUANTITATIVE, LE PLASMA DOIT ETRE REPRESENTATIF DU MATERIAU A ANALYSER. NOTRE OBJECTIF EST DE DETERMINER LES PARAMETRES FONDAMENTAUX DE L'INTERACTION LASER-MATIERE QUI INFLUENCENT LA CONSERVATION DE LA STCHIOMETRIE ENTRE LA CIBLE ET LE PLASMA CREE LORS DE L'ABLATION DE METAUX PAR UN LASER UV A PRESSION ATMOSPHERIQUE DANS UN DOMAINE DE FLUENCES DE 10 A 255 J/CM 2. L'ETUDE DU COUPLAGE LASER-MATERIAU, NECESSAIRE POUR ANALYSER L'INTERACTION REELLE ENTRE LE LASER ET LA CIBLE, EST REALISEE A PARTIR DE L'OBSERVATION DES CRATERES OBTENUS DANS LES ECHANTILLONS. ELLE MET EN EVIDENCE QUE LA SURFACE D'INTERACTION EST UN PARAMETRE DETERMINANT. EN EFFET, L'EFFICACITE D'ABLATION EST PLUS ELEVEE ET LES CRATERES PLUS HOMOGENES LORSQUE LA SURFACE D'INTERACTION EST PLUS PETITE, CE QUI CORRESPOND A DES CONDITIONS POUR LESQUELLES L'ECRANTAGE DU LASER PAR LE PLASMA EST REDUIT. L'ANALYSE DU PLASMA EST EFFECTUEE DANS SA PHASE DE DESEXCITATION, APRES L'IMPULSION LASER. DANS DES ALLIAGES D'ALUMINIUM CONTENANT DU CUIVRE, DU MAGNESIUM ET DU ZINC A QUELQUES % NOUS OBSERVONS QUE LA COMPOSITION DU PLASMA EST IDENTIQUE A CELLE DE LA CIBLE, POUR DIFFERENTES CONDITIONS D'IRRADIATIONS (SURFACE D'INTERACTION, FLUENCE). DANS LES LAITONS (CU-ZN), LES COMPORTEMENTS DES DEUX ELEMENTS SONT DIFFERENTS. L'ANALYSE DU ZINC PEUT ETRE REALISEE QUELLES QUE SOIENT LES CONDITIONS D'IRRADIATION ALORS QU'ELLE N'EST POSSIBLE POUR LE CUIVRE QU'A FLUENCE ELEVEE (> 50 J/CM 2). CETTE ETUDE SYSTEMATIQUE DES LAITONS MET AINSI EN EVIDENCE L'IMPORTANCE DE LA FLUENCE SUR LA COMPOSITION DU PLASMA.

Download or read book ETUDE DE L INTERACTION LASER MATERIAU APPLIQUEE A L ANALYSE ELEMENTAIRE DES SOLIDES written by BEATRICE.. SALLE and published by . This book was released on 1999 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ABLATION LASER, QUI CONSISTE A FOCALISER UN FAISCEAU LASER DE FORTE PUISSANCE SUR UNE CIBLE AFIN DE LA VAPORISER, EST UTILISEE POUR L'ANALYSE ELEMENTAIRE DES MATERIAUX PAR SPECTROMETRIE D'EMISSION OPTIQUE SUR PLASMA PRODUIT PAR LASER. LES PERFORMANCES ANALYTIQUES POURRAIENT ETRE AMELIOREES PAR UNE MEILLEURE MAITRISE DE L'INTERACTION LASER CIBLE RESULTANT D'UNE MEILLEURE COMPREHENSION DES MECANISMES PHYSIQUES MIS EN JEU DANS LE PROCESSUS D'ABLATION LASER. DANS CE BUT, L'INFLUENCE DE LA DUREE D'IMPULSION (FS A NS) SUR LE PROCESSUS DE MICROABLATION LASER (DIAMETRES D'INTERACTION PROCHES DE 10 M), A PRESSION ATMOSPHERIQUE, EST ETUDIEE AFIN DE DEFINIR LES REGIMES D'INTERACTION OU LE PLASMA INFLUENCE L'ABLATION ET QUI SONT DEFAVORABLES POUR UNE BONNE MAITRISE DU PROCEDE EN CONDITIONS DE MICROANALYSE. L'ETUDE CONSISTE A METTRE EN EVIDENCE LES CHANGEMENTS D'EVOLUTION DE L'EFFICACITE D'ABLATION LORSQUE L'IRRADIANCE LASER AUGMENTE. ELLE EST EFFECTUEE A PARTIR DE L'OBSERVATION DES CRATERES FORMES EN SURFACE DES METAUX ET DE LA REALISATION D'UNE IMAGERIE RESOLUE EN TEMPS DES PLASMAS EN EXPANSION PENDANT ET APRES UNE IMPULSION LASER. LES DIFFERENTS RESULTATS MONTRENT L'EXISTENCE DE DEUX REGIMES D'INTERACTION DONT LA LIMITE SE SITUE ENTRE 800 FS ET 2 PS. DANS LE REGIME FS, L'INTERACTION EST DIRECTE ENTRE LE LASER ET LE METAL. L'EFFICACITE D'ABLATION EST INDEPENDANTE DE LA LONGUEUR D'ONDE ET MEILLEURE QUE DANS LE REGIME PS- NS. DANS CE REGIME OU LE MATERIAU EST VAPORISE PENDANT L'IMPULSION LASER, LE PLASMA CREE AU DESSUS DE L'ECHANTILLON ABSORBE, REFLECHIT ET DIFFUSE LE FAISCEAU LASER INCIDENT CE QUI DIMINUE L'EFFICACITE PAR RAPPORT AU REGIME FS, DANS DES PROPORTIONS QUI DEPENDENT DES PARAMETRES EXPERIMENTAUX (LONGUEUR D'ONDE, DIAMETRE D'INTERACTION). AVEC UN LASER NS MULTIMODE FOCALISE AVEC UN OBJECTIF DE GRANDE OUVERTURE NUMERIQUE, IL EST POSSIBLE DE REDUIRE L'ECRANTAGE PLASMA ET D'OBTENIR UN VOLUME ABLATE IDENTIQUE A CELUI OBTENU DANS LE REGIME D'INTERACTION IDEAL FS.

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 Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Download or read book AGARD Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In Vessel Melt Retention and Ex Vessel Corium Cooling IAEA Tecdoc No 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.

Download or read book Multifunctional Oxide Heterostructures written by Evgeny Y. Tsymbal and published by OUP Oxford. This book was released on 2012-08-30 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the rapidly developing field of oxide thin-films and heterostructures. Oxide materials combined with atomic-scale precision in a heterostructure exhibit an abundance of macroscopic physical properties involving the strong coupling between the electronic, spin, and structural degrees of freedom, and the interplay between magnetism, ferroelectricity, and conductivity. Recent advances in thin-film deposition and characterization techniques made possible the experimental realization of such oxide heterostructures, promising novel functionalities and device concepts. The book consists of chapters on some of the key innovations in the field over recent years, including strongly correlated oxide heterostructures, magnetoelectric coupling and multiferroic materials, thermoelectric phenomena, and two-dimensional electron gases at oxide interfaces. The book covers the core principles, describes experimental approaches to fabricate and characterize oxide heterostructures, demonstrates new functional properties of these materials, and provides an overview of novel applications.

Download or read book Comprehensive Cervical Cancer Control written by World Health Organization and published by World Health Organization. This book was released on 2006 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most women who die from cervical cancer, particularly in developing countries, are in the prime of their life. They may be raising children, caring for their family, and contributing to the social and economic life of their town or village. Their death is both a personal tragedy, and a sad and unnecessary loss to their family and their community. Unnecessary, because there is compelling evidence, as this Guide makes clear, that cervical cancer is one of the most preventable and treatable forms of cancer, as long as it is detected early and managed effectively. Unfortunately, the majority of women in developing countries still do not have access to cervical cancer prevention programmes. The consequence is that, often, cervical cancer is not detected until it is too late to be cured. An urgent effort is required if this situation is to be corrected. This Guide is intended to help those responsible for providing services aimed at reducing the burden posed by cervical cancer for women, communities and health systems. It focuses on the knowledge and skills needed by health care providers, at different levels of care.

Download or read book Science and the Media written by Massimiano Bucchi and published by Routledge. This book was released on 2014-03-20 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a theoretical framework which allows us to understand why and how scientists address the general public. Bucchi's theories on scientific communication in the media make a valuable contribution to the current debate.

Download or read book Cantor s Dilemma written by Carl Djerassi and published by Doubleday. This book was released on 2012-11-21 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: When Professor Isidore Cantor reveals his latest breakthrough in cancer research, his promising research fellow, Dr. Jeremiah Stafford, has only to conduct the experiment and win Cantor the Nobel prize. But how far will Stafford go to guarantee the results? Carl Djerassi draws from his career as a world-famous scientist to describe the fierce competition driving scientific superstars in this gripping novel.

Download or read book Data Storage at the Nanoscale written by Gan Fuxi and published by CRC Press. This book was released on 2015-02-09 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the big data era, data storage is one of the cores in the whole information chain, which includes production, transfer, sharing, and finally processing. Over the years, the growth of data volume has been explosive. Today, various storage services need memories with higher density and capacity. Moreover, information storage in the big data applic

Download or read book The Problems of the Arid Zone written by Unesco and published by paris. This book was released on 1962 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cancer Pain Relief written by World Health Organization and published by World Health Organization. This book was released on 1996 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of a guide, which introduced a simple, yet highly effective method for the relief of cancer pain. Thoroughly revised and updated, the new edition further refines the WHO method, which advocates the use of a small number of relatively inexpensive drugs, including morphine. Revisions draw on experiences with millions of patients around the world as well as new knowledge about the specific pain syndromes unique to cancer. Completely new are chapters describing the international system by which morphine and other opioids are made available for medical purposes. The book has two parts. Part one provides a practical guide to the relief of cancer pain, concentrating on drug treatment as the mainstay of pain management. The most extensive section sets out detailed guidelines for the selection and prescribing of non-opioid analgesics, opioid analgesics, drugs for neuropathic pain, and adjuvant drugs for the treatment of adverse effects, the enhancement of pain relief and the management of concomitant psychological disturbances. Information ranges from explanations of how specific drugs work, through the precautions to take in the presence of certain disorders, to a list of factors that influence the effectiveness of opioids. Concerning the use of opioids, readers are reminded that psychological dependence does not occur in cancer patients and that the only correct dose of morphine is the one that relieves the pain. Part two provides a guide to opioid availability. A discussion of the reasons why opioids continue to be underprescribed or difficult to obtain is followed by an explanation of the Single Convention on Narcotic Drugs.

Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.

Download or read book Climate and the British Scene Collins New Naturalist Library Book 22 written by Gordon Manley and published by HarperCollins UK. This book was released on 2013-04-11 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: From Chaucer’s sweet April showers to the peasoupers of Sherlock Holmes the British scene cannot be contemplated without climate entering in. This edition is exclusive to newnaturalists.com