Download or read book Contribution diverses tudes th oriques du contraste en microscopie lectronique transmission written by Noël Bonnet (docteur en sciences physiques.) and published by . This book was released on with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution diverses tudes th oriques du contraste en microscopie lectronique transmission written by Noël Bonnet and published by . This book was released on 1976 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE PARAMETRE PRINCIPAL QUI GOUVERNE LE CONTRASTE DES IMAGES EST LA TENSION D'ACCELERATION. ON MONTRE TOUTEFOIS QUE LES PARAMETRES PROPRES DE L'ECHANTILLON (LE MOTIF CRISTALLIN ET LA TEMPERATURE EN PARTICULIER) PEUVENT AVOIR AUSSI UNE TRES GRANDE IMPORTANCE. LA SECONDE PARTIE EST CONSACREE A LA "THEORIE DU TRANSFERT" PAR LE MICROSCOPE ELECTRONIQUE. RECHERCHE DES CONDITIONS OPTIMALES DE VISIBILITE EN MICROSCOPIE A HAUTE RESOLUTION. DEUX TYPES D'APPLICATIONS: OBJETS DITS "DE PHASE FAIBLE" ET OBJETS CRISTALLINS.

Download or read book Contribution l tude en th orie dynamique de la microscopie lectronique du contraste d un joint de Macle written by Pierre Maletras and published by . This book was released on 1972 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude du contraste des objets amorphes en microscopie lectronique written by Paul Muchin and published by . This book was released on 1974 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Etude des fonctions de transfert du contraste de phase en microscopie lectronique par transmission written by Adrien Beorchia and published by . This book was released on 1973 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude des contrastes en microscopie lectronique tr s haute tension written by André Marc Rocher and published by . This book was released on 1973 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA PENETRATION EN FONCTION DE LA TENSION ET DE L'ORIENTATION DANS DES ECHANTILLONS DE CUIVRE ET D'ALUMINIUM. ETUDE ET INTERPRETATION A PARTIR DE LA THEORIE DYNAMIQUE A N ONDES

Download or read book CONTRIBUTION A L ETUDE DES CONTRASTES DE DIFFRACTION EN MICROSCOPIE ELECTRONIQUE A TRES HAUTE TENSION APPLICATION AUX CONTOURS D EXTINCTION ET AUX DEFAUTS D EMPILEMENT written by C.. PRUNIER MORY and published by . This book was released on 1973 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: INTRODUCTION, GRACE A LA THEORIE DYNAMIQUE, D'EQUATIONS PERMETTANT DE RENDRE COMPTE DU TRAJET DES ELECTRONS DANS LE CRISTAL PARFAIT ET DES INFORMATIONS RECUEILLIES A LA SORTIE DE CELUI-CI. REGLES DE CONTRASTE DES DEFAUTS D'EMPILEMENT EN HAUTE TENSION

Download or read book Contribution l tude des contrastes en microscopie lectronique tr s haute tension written by André Marc Rocher and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ETUDE THEORIQUE ET EXPERIMENTALE DE LA FORMATION DE L IMAGE EN MICROSCOPIE ELECTRONIQUE A BALAYAGE PAR TRANSMISSION written by CLAUDIE.. PRUNIER MORY and published by . This book was released on 1985 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: CALCUL DE LA FORME ET DE LA TAILLE DE LA SONDE D'ELECTRONS INCIDENTS SUR LE SPECIMEN. ETUDE DE L'INTERACTION AVEC L'ECHANTILLON ET ROLE DES DIVERS DETECTEURS. RESOLUTION SPATIALE, CONTRASTE ET RAPPORT SIGNAL SUR BRUIT

Download or read book Contribution l tude en microscopie lectronique de l influence des r flexions accidentelles sur les contrastes de diffraction written by François Ajustron and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude des contrastes des pseudo lignes de Kikuchi par microscopie lectronique balayage written by Edmond Vicario and published by . This book was released on 1970 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microscopie electronique selective en transmission contribution a l etude de l ordre dans la matiere written by SERGE GALAUP and published by . This book was released on 1996 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ADAPTATION SUR LES MICROSCOPES ELECTRONIQUES EN TRANSMISSION DE SYSTEMES DISPERSIFS EN ENERGIE D'ELECTRONS ET DE NOUVEAUX DISPOSITIFS DE DETECTION (SYSTEMES SCINTILLATEUR-PHOTOMULTIPLICATEUR, RESEAUX DE PHOTODIODES OU CCD) PERMET D'ENVISAGER UNE DETERMINATION QUANTITATIVE PRECISE DE LA CONTRIBUTION DES PROCESSUS DE DIFFUSION ELASTIQUE ET INELASTIQUE A LA FORMATION DES IMAGES ET DES DIAGRAMMES DE DIFFRACTION ELECTRONIQUE. ELLE CONSTITUE UNE ETAPE ESSENTIELLE POUR LA CONNAISSANCE DE L'ORDRE DANS LA MATIERE A L'ECHELLE ATOMIQUE. LE DEVELOPPEMENT RECENT DE SYSTEMES DE FILTRAGE D'IMAGES CONFIRME CET INTERET, CEPENDANT LES SYSTEMES PROPOSES RESTENT ONEREUX ET SONT ENCORE PEU ACCESSIBLES. A PARTIR D'UN SYSTEME DISPERSIF CONSTITUE D'UN PRISME MAGNETIQUE, DISPOSE SOUS LA COLONNE D'UN MICROSCOPE, NOUS AVONS DEVELOPPE UN SYSTEME DE FILTRAGE EN ENERGIE DES INTENSITES. IL EST EXPLOITABLE LORSQUE L'INFORMATION UTILE EST DISTRIBUEE SUIVANT UNE DIRECTION COMME C'EST LE CAS DANS LES DIAGRAMMES DE DIFFRACTION ELECTRONIQUE OU DANS LES IMAGES DE RESEAUX DE FRANGES ET D'INTERFACES. DANS NOTRE MONTAGE LE MICROSCOPE EST PILOTE PAR UN MICROORDINATEUR QUI PERMET DE COMMANDER LA DEFLEXION DU DIAGRAMME OU DE L'IMAGE DEVANT L'OUVERTURE D'ENTREE DU SPECTROMETRE UTILISE COMME MONOCHROMATEUR. CET ORDINATEUR EST INTERFACE AVEC LE SPECTROMETRE POUR L'ACQUISITION ET LE TRAITEMENT DES DONNEES. LE SYSTEME DE COMPTAGE SCINTILLATEUR-PHOTOMULTIPLICATEUR POSSEDE UNE DYNAMIQUE SUFFISAMMENT LARGE (6 DECADES) POUR PERMETTRE LE TRAITEMENT DE LA PLUPART DES TYPES DE PROFILS D'INTENSITE OBTENUS A PARTIR DES IMAGES OU DES DIAGRAMMES. LE SYSTEME PEUT ETRE UTILISE POUR ETUDIER LES PROCESSUS DE DIFFUSION ELASTIQUE ET INELASTIQUE ET LEUR CONTRIBUTION A LA FORMATION DES IMAGES ET DES DIAGRAMMES DE DIFFRACTION. UNE DES APPLICATIONS IMPORTANTES DE CE DISPOSITIF CONCERNE LA DETERMINATION DE L'ORDRE A COURTE DISTANCE DANS LES MATERIAUX AMORPHES OU POLYCRISTALLINS. ELLE PEUT ETRE FAITE AVEC UNE PRECISION DE 3.10#-#3 NM POUR DES VALEURS DE CES DISTANCES ALLANT JUSQU'A 1,2 NM. ELLE A ETE UTILISEE POUR L'ETUDE DE MATERIAUX CERAMIQUES.

Download or read book Principles and Practice of Variable Pressure Environmental Scanning Electron Microscopy VP ESEM written by Debbie Stokes and published by John Wiley & Sons. This book was released on 2008-12-22 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers a simple starting point to VPSEM, especially for new users, technicians and students containing clear, concise explanations Crucially, the principles and applications outlined in this book are completely generic: i.e. applicable to all types of VPSEM, irrespective of manufacturer. Information presented will enable reader to turn principles into practice Published in association with the Royal Microscopical Society (RMS) -www.rms.org.uk

Download or read book Am lioration du contraste en microscopie lectronique transmission written by Isabelle ANSELME-BERTRAND and published by . This book was released on 1993 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microscopie lectronique s lective en transmission Contribution l tude de l ordre dans la mati re written by Serge Galaup and published by . This book was released on 1996 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ADAPTATION SUR LES MICROSCOPES ELECTRONIQUES EN TRANSMISSION DE SYSTEMES DISPERSIFS EN ENERGIE D'ELECTRONS ET DE NOUVEAUX DISPOSITIFS DE DETECTION (SYSTEMES SCINTILLATEUR-PHOTOMULTIPLICATEUR, RESEAUX DE PHOTODIODES OU CCD) PERMET D'ENVISAGER UNE DETERMINATION QUANTITATIVE PRECISE DE LA CONTRIBUTION DES PROCESSUS DE DIFFUSION ELASTIQUE ET INELASTIQUE A LA FORMATION DES IMAGES ET DES DIAGRAMMES DE DIFFRACTION ELECTRONIQUE. ELLE CONSTITUE UNE ETAPE ESSENTIELLE POUR LA CONNAISSANCE DE L'ORDRE DANS LA MATIERE A L'ECHELLE ATOMIQUE. LE DEVELOPPEMENT RECENT DE SYSTEMES DE FILTRAGE D'IMAGES CONFIRME CET INTERET, CEPENDANT LES SYSTEMES PROPOSES RESTENT ONEREUX ET SONT ENCORE PEU ACCESSIBLES. A PARTIR D'UN SYSTEME DISPERSIF CONSTITUE D'UN PRISME MAGNETIQUE, DISPOSE SOUS LA COLONNE D'UN MICROSCOPE, NOUS AVONS DEVELOPPE UN SYSTEME DE FILTRAGE EN ENERGIE DES INTENSITES. IL EST EXPLOITABLE LORSQUE L'INFORMATION UTILE EST DISTRIBUEE SUIVANT UNE DIRECTION COMME C'EST LE CAS DANS LES DIAGRAMMES DE DIFFRACTION ELECTRONIQUE OU DANS LES IMAGES DE RESEAUX DE FRANGES ET D'INTERFACES. DANS NOTRE MONTAGE LE MICROSCOPE EST PILOTE PAR UN MICROORDINATEUR QUI PERMET DE COMMANDER LA DEFLEXION DU DIAGRAMME OU DE L'IMAGE DEVANT L'OUVERTURE D'ENTREE DU SPECTROMETRE UTILISE COMME MONOCHROMATEUR. CET ORDINATEUR EST INTERFACE AVEC LE SPECTROMETRE POUR L'ACQUISITION ET LE TRAITEMENT DES DONNEES. LE SYSTEME DE COMPTAGE SCINTILLATEUR-PHOTOMULTIPLICATEUR POSSEDE UNE DYNAMIQUE SUFFISAMMENT LARGE (6 DECADES) POUR PERMETTRE LE TRAITEMENT DE LA PLUPART DES TYPES DE PROFILS D'INTENSITE OBTENUS A PARTIR DES IMAGES OU DES DIAGRAMMES. LE SYSTEME PEUT ETRE UTILISE POUR ETUDIER LES PROCESSUS DE DIFFUSION ELASTIQUE ET INELASTIQUE ET LEUR CONTRIBUTION A LA FORMATION DES IMAGES ET DES DIAGRAMMES DE DIFFRACTION. UNE DES APPLICATIONS IMPORTANTES DE CE DISPOSITIF CONCERNE LA DETERMINATION DE L'ORDRE A COURTE DISTANCE DANS LES MATERIAUX AMORPHES OU POLYCRISTALLINS. ELLE PEUT ETRE FAITE AVEC UNE PRECISION DE 3.10#-#3 NM POUR DES VALEURS DE CES DISTANCES ALLANT JUSQU'A 1,2 NM. ELLE A ETE UTILISEE POUR L'ETUDE DE MATERIAUX CERAMIQUES

Download or read book Cracks in superalloys written by Jonas Saarimäki and published by Linköping University Electronic Press. This book was released on 2018-01-18 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas turbines are widely used in industry for power generation and as a power source at hard to reach locations where other possibilities for electrical power supplies are insufficient. New ways of producing greener energy is needed to reduce emission levels. This can be achieved by increasing the combustion temperature of gas turbines. High combustion temperatures can be detrimental and degrade critical components. This raises the demands on the high temperature performance of the superalloys used in gas turbine components. These components are frequently subjected to different cyclic loads combined with for example dwell-times and overloads at elevated temperatures, which can influence the crack growth. Dwell-times have been shown to accelerate crack growth and change cracking behaviour in both Inconel 718, Haynes 282 and Hastelloy X. On the other hand, overloads at the beginning of a dwell-time cycle have been shown to retard the dwell-time effect on crack growth in Inconel 718. More experiments and microstructural investigations are needed to better understand these effects. The work presented in this thesis was conducted under the umbrella of the research program Turbo Power; "High temperature fatigue crack propagation in nickel-based superalloys", where I have mainly looked at fatigue crack growth mechanisms in superalloys subjected to dwell-fatigue, which can have a devastating effect on crack propagation behaviour. Mechanical testing was performed under operation-like cycles in order to achieve representative microstructures and material data for the subsequent microstructural work. Microstructures were investigated using light optical microscopy and scanning electron microscopy (SEM) techniques such as electron channeling contrast imaging (ECCI) and electron backscatter diffraction (EBSD). The outcome of this work has shown that there is a significant increase in crack growth rate when dwell-times are introduced at maximum load (0 % overload) in the fatigue cycle. With the introduction of a dwell-time there is also a shift from transgranular to intergranular crack growth for both Inconel 718 and Haynes 282. The crack growth rate decreases with increasing overload levels in Inconel 718 when an overload is applied prior to the dwell-time. At high temperature, intergranular crack growth was observed in Inconel 718 as a result of oxidation and the creation of nanometric voids. Another observed growth mechanism was crack advance along ?-phase boundaries with subsequent oxidation of the ?-phase. This thesis comprises two parts. Part I gives an introduction to the field of superalloys and the acting microstructural mechanisms related to fatigue and crack propagation. Part II consists of five appended papers, which report the work completed as part of the project.

Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.