Download or read book Application des techniques de traitement du signal en spectroscopie Auger written by Noureddine Doghmane and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Traitement du signal en spectroscopie d lectrons Auger et conception d un logiciel pour l analyse quantitative des surfaces written by Mubanga-Nyembwe and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: L'extraction du signal Auger utile fourni par les spectres d'électrons pose le problème de la soustraction du fond continu des électrons secondaires et de la déconvolution des multiplets en A.E.S. (ou AUGER ELECTRON SPECTROSCOPY). Afin d'optimiser l’acquisition, avant tout traitement numérique, une étude du bruit du canon électronique à effet de champ (pointe w310 de 50 A°) ) et des autres facteurs de bruit inhérents à la spectroscopie d'électrons a été menée. Elle a permis une amélioration du rapport signal sur bruit (S.N.R.) et une minimisation du temps d'acquisition global d'un spectre grâce à la mise en œuvre d'une procédure d'acquisition cyclée système multicanal) et d'un test statistique (basé sur la variance d'Allan) tenant compte de la fréquence-charnière du "bruit rose", de la résolution et des temps de réponse des alimentations "Haute Tension". La modélisation du fond continu ou "background" des électrons secondaires repose sur le modèle théorique de Wolff (1954), revu et corrigé par Seah (1969) et développé par E. N. Sickafus (1977) via une représentation logarithmique du spectre direct N(E). Eu égard à la distribution des électrons rétrodiffusés, dans certains domaines d'énergie primaire et au prorata du nombre atomique Z du matériau analysé, le background doit présenter (en mode Log N(E) VS LogE) des portions linéaires entre pics d'électrons Auger ou sources surfaciques et subsurfaciques. Les pentes de ces segments sont différentes. Après cette modélisation, l’extraction des pics Auger est mise en œuvre à l’aide d'une approche originale fondée sur la théorie des distributions et débouchant sur la résolution d'une équation intégrale de Fredholm. Nous pouvons dès lors approcher la concentration atomique d'un élément dans une matrice donnée.
Download or read book Advances in Electronics and Electron Physics written by and published by Academic Press. This book was released on 1980-11-28 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Electronics and Electron Physics
Download or read book Analyse et traitement des signaux 2e d written by Etienne Tisserand and published by Dunod. This book was released on 2009-01-14 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les méthodes et techniques de traitement des signaux ont connu un essor sans précédent depuis ces trente dernières années. La maîtrise de l'analyse et du traitement du signal est primordiale dans le multimédia et internet, en radiotéléphonie, dans le domaine médical, dans les mesures car le technicien ou l'ingénieur doivent exploiter au mieux le signal pour en extraire l'information utile. Dans cette nouvelle édition, le cours a été entièrement actualisé pour tenir compte des nouveaux formats utilisés pour le son, l'image et la vidéo. L'étudiant trouvera aussi des exemples et des exercices d'applications supplémentaires et il pourra se référer, en fin de chaque chapitre, à des fiches méthodes.
Download or read book S paration de sources non n gatives written by Saïd Moussaoui and published by . This book was released on 2005 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lors de l'analyse d'un échantillon d'une substance multi-composantes par des techniques spectroscopiques, les spectres mesurés sont des mélanges linéaires des spectres purs des différentes composantes. Le but de cette analyse est l'identification des composantes et la détermination de leur concentrations. La contrainte principale étant la non-négativité, il s'agit donc d'un problème de séparation de sources non-négatives. La séparation de sources est un problème fondamental en traitement du signal dont une hypothèse forte est celle de l'indépendance statistique des sources. Compte tenu du recouvrement entre les spectres purs, leur corrélation mutuelle devient parfois importante, ce que rend l'application d'une méthode fondée sur la contrainte d'orthogonalité infructueuse. Par ailleurs, une analyse des solutions admissibles sous la contrainte de non-négativité montre que cette information toute seule ne garantit l'unicité de la solution que dans certains cas particuliers. Ces deux constats motivent le développement de deux méthodes qui considèrent conjointement l'hypothèse d'indépendance et l'information de non-négativité. La première méthode est issue de l'approche de séparation par maximum de vraisemblance et la deuxième se fonde sur une inférence bayésienne. L'évaluation numérique des performances permet, d'une part, de mettre en évidence les avantages de ces méthodes par rapport aux approches usuelles et, d'autre part, de déceler leurs limitations. Des applications au traitement de signaux réels issus de trois types de spectroscopies (Infrarouge, Raman et Ultraviolet-Visible) illustrent l'apport de la séparation de sources non-négatives à l'analyse physico-chimique
Download or read book METHODES DE TRAITEMENT DU SIGNAL APPLIQUEES A LA SPECTROSCOPIE ET A L IMAGERIE PAR RESONANCE MAGNETIQUE written by SOPHIE.. CAVASSILA and published by . This book was released on 1996 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE CONCERNE L'ETUDE ET LE DEVELOPPEMENT DE METHODES DE TRAITEMENT DU SIGNAL POUR LE TRAITEMENT DES DONNEES DE RESONANCE MAGNETIQUE NUCLEAIRE (SPECTROSCOPIE, IMAGERIE). NOUS AVONS AINSI PROPOSE DES TECHNIQUES APPLICABLES DIRECTEMENT DANS LE DOMAINE DE MESURE FONDEES SUR LES METHODES DE PREDICTION LINEAIRE POUR L'ESTIMATION DES PARAMETRES SPECTRAUX ET LE REHAUSSEMENT DES SIGNAUX RMN. LA THEORIE DE CRAMER RAO NOUS A PERMIS D'ETUDIER ANALYTIQUEMENT LES PRECISIONS DES ESTIMATIONS EN FONCTION DES PARAMETRES SPECTRAUX (FREQUENCES, AMPLITUDES, FACTEURS D'AMORTISSEMENT ET PHASES) ET EXPERIMENTAUX (BRUIT ET PERIODE D'ECHANTILLONNAGE) POUR UN SIGNAL COMPORTANT DEUX COMPOSANTES SPECTRALES. CELA NOUS A PERMIS D'EVALUER L'INFLUENCE DE CES PARAMETRES AINSI QUE CELLE DE LA CONNAISSANCE A PRIORI SUR LES PRECISIONS. NOUS AVONS EGALEMENT PROPOSE UNE METHODE SIMPLE DE PRETRAITEMENT FONDEE SUR LE FILTRAGE NUMERIQUE (ER-FILTER) QUI PERMET DE SELECTIONNER LE SIGNAL CORRESPONDANT A LA REGION D'INTERET. APPLIQUEE EN AMONT DES TECHNIQUES PARAMETRIQUES, ELLE PERMET UNE AMELIORATION DE LEUR RESOLUTION TOUT EN REDUISANT CONSIDERABLEMENT LES TEMPS DE CALCUL. D'AUTRE PART, NOUS AVONS PROPOSE DES APPLICATIONS ORIGINALES DES METHODES FONDEES SUR LA DECOMPOSITION AUX VALEURS SINGULIERES POUR L'IMAGERIE. NOUS AVONS PU CONSIDERABLEMENT AUGMENTER LE RAPPORT SIGNAL SUR BRUIT DES IMAGES RMN EN APPLIQUANT L'ESTIMATEUR DE CADZOW AUX SIGNAUX DE L'ESPACE RECIPROQUE DE L'ESPACE IMAGE. D'AUTRE PART, LA QUANTIFICATION DES SIGNAUX D'IMAGERIE SPECTROSCOPIQUE AVEC EPLPSVD NOUS A PERMIS D'OBTENIR LES IMAGES DES PARAMETRES SPECTRAUX ET DES TEMPS DE RELAXATION TRANSVERSAUX T#2, PARAMETRE FONDAMENTAL, POUR CHAQUE COMPOSANTE SPECTRALE
Download or read book Routledge French Technical Dictionary Dictionnaire technique anglais written by Yves Arden and published by Routledge. This book was released on 2013-01-11 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt: The French-English volume of this highly acclaimed set consists of some 100,000 keywords in both French and English, drawn from the whole range of modern applied science and technical terminology. Covers over 70 subject areas, from engineering and chemistry to packaging, transportation, data processing and much more.
Download or read book Journal de microscopie et de spectroscopie lectroniques written by and published by . This book was released on 1985 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atoms Solids and Plasmas in Super Intense Laser Fields written by Dimitri Batani and published by Springer Science & Business Media. This book was released on 2001-09-30 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 30th Course of the International School of Quantum Electronics on Atoms, Solids and Plasmas in Super-Intense Laser Fields, held 8-14 July, in Erice, Sicily
Download or read book Physics Briefs written by and published by . This book was released on 1984 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Analysis of Paper written by Terrance E. Conners and published by CRC Press. This book was released on 1995-07-26 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Analysis of Paper examines surface analysis techniques from a paper industry perspective and places heavy emphasis on applications. Modern techniques, including ion mass spectrometry, infrared spectroscopy, and optical profilometry are reviewed in a straightforward manner. This new book provides details on widely used methods and instruments, and discusses how they can be used to attain, for example, contour maps of the microscopic constituents on paper surfaces and accurate analyses of the physical properties of paper. Organized into three sections, Surface Analysis of Paper provides thorough coverage of the physical characteristics of paper, and a clear picture of new and emerging analytical methods. Carefully chosen background material on fundamental concepts is included wherever such material assists in understanding the uses of analysis methods. Each chapter contains: An introduction A description of the technique A discussion of the type of information that can be obtained with the particular technique Practical examples to demonstrate the advantages of the technique
Download or read book An Introduction to Surface Analysis by XPS and AES written by John F. Watts and published by John Wiley & Sons. This book was released on 2019-08-27 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a concise yet comprehensive introduction to XPS and AES techniques in surface analysis This accessible second edition of the bestselling book, An Introduction to Surface Analysis by XPS and AES, 2nd Edition explores the basic principles and applications of X-ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES) techniques. It starts with an examination of the basic concepts of electron spectroscopy and electron spectrometer design, followed by a qualitative and quantitative interpretation of the electron spectrum. Chapters examine recent innovations in instrument design and key applications in metallurgy, biomaterials, and electronics. Practical and concise, it includes compositional depth profiling; multi-technique analysis; and everything about samples—including their handling, preparation, stability, and more. Topics discussed in more depth include peak fitting, energy loss background analysis, multi-technique analysis, and multi-technique profiling. The book finishes with chapters on applications of electron spectroscopy in materials science and the comparison of XPS and AES with other analytical techniques. Extensively revised and updated with new material on NAPXPS, twin anode monochromators, gas cluster ion sources, valence band spectra, hydrogen detection, and quantification Explores key spectroscopic techniques in surface analysis Provides descriptions of latest instruments and techniques Includes a detailed glossary of key surface analysis terms Features an extensive bibliography of key references and additional reading Uses a non-theoretical style to appeal to industrial surface analysis sectors An Introduction to Surface Analysis by XPS and AES, 2nd Edition is an excellent introductory text for undergraduates, first-year postgraduates, and industrial users of XPS and AES.
Download or read book Physical Principles of Electron Microscopy written by Ray Egerton and published by Springer Science & Business Media. This book was released on 2011-02-11 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scanning and stationary-beam electron microscopes are indispensable tools for both research and routine evaluation in materials science, the semiconductor industry, nanotechnology and the biological, forensic, and medical sciences. This book introduces current theory and practice of electron microscopy, primarily for undergraduates who need to understand how the principles of physics apply in an area of technology that has contributed greatly to our understanding of life processes and "inner space." Physical Principles of Electron Microscopy will appeal to technologists who use electron microscopes and to graduate students, university teachers and researchers who need a concise reference on the basic principles of microscopy.
Download or read book Science Past Science Future written by Isaac Asimov and published by Doubleday Books. This book was released on 1975 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of 43 essays on many subjects, from the various sciences to essays about society.
Download or read book Peaceful Uses of Atomic Energy written by United States. Department of State and published by . This book was released on 1955 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer. This book was released on 1976 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.
Download or read book Sustainability written by Rao Y. Surampalli and published by John Wiley & Sons. This book was released on 2020-03-19 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive resource to sustainability and its application to the environmental, industrial, agricultural and food security sectors Sustainability fills a gap in the literature in order to provide an important guide to the fundamental knowledge and practical applications of sustainability in a wide variety of areas. The authors – noted experts who represent a number of sustainability fields – bring together in one comprehensive volume the broad range of topics including basic concepts, impact assessment, environmental and the socio-economic aspects of sustainability. In addition, the book covers applications of sustainability in environmental, industrial, agricultural and food security, as well as carbon cycle and infrastructural aspects. Sustainability addresses the challenges the global community is facing due to population growth, depletion of non-renewable resources of energy, environmental degradation, poverty, excessive generation of wastes and more. Throughout the book the authors discuss the economics, ecological, social, technological and systems perspectives of sustainability. This important resource: • Explores the fundamentals as well as the key concepts of sustainability; • Covers basic concepts, impact assessment, environmental and socio-economic aspects, applications of sustainability in environmental, industrial, agricultural and food security, carbon cycle and infrastructural aspects; • Argues the essentiality of sustainability in ensuring the propitious future of earth systems; and • Authored by experts from a range of various fields related to sustainability. Written for researchers and scientists, students and academics, Sustainability: Fundamentals and Applications is a comprehensive book that covers the basic knowledge of the topic combined with practical applications.
