Literatura académica sobre el tema "Imagerie de Microstructure par Diffraction"
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Artículos de revistas sobre el tema "Imagerie de Microstructure par Diffraction"
Boutu, Willem y Hamed Merdji. "Imagerie nanométrique femtoseconde par diffraction X cohérente". Photoniques, n.º 59 (mayo de 2012): 44–49. http://dx.doi.org/10.1051/photon/20125944.
Texto completoAbdallahoui, Y., H. Walaszek, C. Peyrac y H. P. Lieurade. "Evaluation des contraintes résiduelles de soudage par méthode ultrasonore et validation par la méthode du trou par perçage incrémental et diffraction des rayons X. Influence de la microstructure". Revue de Métallurgie 96, n.º 9 (septiembre de 1999): 1143–54. http://dx.doi.org/10.1051/metal/199996091143.
Texto completoPonnouradjou, A., R. Piques, A. R. Brunsell, J. Renard y M. Durand. "Étude de la microstructure des phases amorphes dans des fibres de nylon-6 par diffraction des rayons X". Le Journal de Physique IV 08, PR5 (octubre de 1998): Pr5–15—Pr5–22. http://dx.doi.org/10.1051/jp4:1998503.
Texto completoBoulle, A., R. Guinebretière y A. Dauger. "Étude de la microstructure de couches minces par diffraction des rayons X : description analytique des profils de raie". Journal de Physique IV (Proceedings) 118 (noviembre de 2004): 183–91. http://dx.doi.org/10.1051/jp4:2004118022.
Texto completoBoughedaoui, Rachid, Mohamed Cherif Azzaz, Mohamed Tahar Melouah, Abdennour El Mohri, M. Zergoug, Azzeddine Lounis y Mohamed Azzaz. "Structure, Microstructure and Magnetic Properties of Nanostructured Alloys Fe-Nd-B Prepared by Mechanical Alloying". Journal of Nano Research 55 (noviembre de 2018): 11–21. http://dx.doi.org/10.4028/www.scientific.net/jnanor.55.11.
Texto completoPaillère-Martinot, M. L., H. Lemaitre, H. Vulser, E. Artiges, R. Miranda y J. L. Martinot. "Vulnérabilité aux troubles de l’humeur à l’adolescence". European Psychiatry 28, S2 (noviembre de 2013): 60. http://dx.doi.org/10.1016/j.eurpsy.2013.09.157.
Texto completoJi, N., J. L. Lebrun, B. Marty, M. Bessiere y B. Chenal. "Etude de la microstructure de déformation par diffraction "haute résolution" : contribution des parois et de l’intérieur des cellules de dislocations". Revue de Métallurgie 90, n.º 9 (septiembre de 1993): 1110. http://dx.doi.org/10.1051/metal/199390091110.
Texto completoAli, A., A. Ahmad, K. M. Deen y R. Ahmad. "Microstructural and Electrochemical Characterization of Ni/Ti2N Composite Coating for Sintered NdFeB Permanent Magnets". Key Engineering Materials 442 (junio de 2010): 255–62. http://dx.doi.org/10.4028/www.scientific.net/kem.442.255.
Texto completoDorval, Vincent, Nicolas Leymarie, Alexandre Imperiale, Edouard Demaldent, Zakaria Aghenzour y Pierre-Emile Lhuillier. "Simulations numériques à l'échelle de microstructures hétérogènes pour déterminer des propriétés effectives de propagation ultrasonore". e-journal of nondestructive testing 28, n.º 9 (septiembre de 2023). http://dx.doi.org/10.58286/28514.
Texto completoNagaraju, Sharath Ballupete, Karthik Sathyanarayana, Madhu Kodigarahalli Somashekara, Dyavappanakoppalu Govindaswamy Pradeep, Madhu Puttegowda y Akarsh Verma. "Artificial neural networks for predicting mechanical properties of Al2219-B4C-Gr composites with multireinforcements". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 5 de septiembre de 2023. http://dx.doi.org/10.1177/09544062231196038.
Texto completoTesis sobre el tema "Imagerie de Microstructure par Diffraction"
Ribart, Clément. "Essais 4D multimodaux et simulations numériques appliqués à l'étude de la plasticité cristalline". Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLM001.
Texto completoEstablishing microstructure-property relationships is a critical challenge for the design of structural materials. Metals dis-play an heterogeneous polycrystalline organisation which drives their performance, hence the need to access to themechanical quantities of interest at the grain and sub-grain scales. A variety of characterization techniques now givesaccess to those levels of details. Recent progress in synchrotron and laboratory X-ray techniques have contributed to therise of multimodal experiments, especially by allowing non destructive in situ testing. In particular, Diffraction ContrastTomography (DCT), which belongs to the Diffraction Microcrostructure Imaging (DMI) techniques family, allows the re-construction of 3D grain maps with their associated orientations field and actual morphology. These digital twins canbe used directly for simulations. Improved convergence of experimental and numerical modalities leads to unified andmassive databases. This represents an opportunity to unlock the understanding of the complex physical mechanisms atstake. The main objective of the present work is to contribute, with concrete use cases, to demonstrate the potential ofthis approach. We introduce two in situ multimodal datasets applied to incipient crystal plasticity on a commercially puretitanium. First, we assess the performance of the EBSD, synchrotron DCT and LabDCT techniques used. A statisticalregistration technique allows to compare rigorously these modalities. Typical plasticity mechanisms are observed at thesurface and in the volume (grains rotation, plastic slip and intragranular transmission, GND dislocations accumulation atgrain boundaries), as well as the formation of sub grains, an unprecedented observation only enabled by the DCT. Inaddition, the FFT simulation performed on a DCT volume allowed us to validate the performance of the continuous crystalplasticity model, excepted in the vicinity of the non modelized precipitates. The last chapter presents a complementarynumerical study of the performance of the LabDCT algorithm, commercialized by XNovo Technology, on a microstructurein the deformed state. This study lies in the scope of extending the reconstruction applications of DMI techniques. Weshowed good performance of the algorithm for tracking grains rotations during the deformation. On the other hand, the program is not able to reconstruct a reliable intragranular orientation field
Ge, Xunyou. "Imagerie ultrarapide à l'échelle nanométrique par diffraction XUV cohérente". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00828058.
Texto completoGe, Xunyou. "Imagerie ultrarapide à l’échelle nanométrique par diffraction XUV cohérente". Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112361/document.
Texto completoUltrafast imaging of isolated objects with nanometric spatial resolution is a great challenge in our time. The lensless imaging techniques have shown great potential to answer this challenge. In lensless imaging, one can reconstruct sample images from their diffraction patterns with computational algorithms, which replace the conventional lens systems. Using ultrafast and coherent light sources, such as free electron laser and high order harmonics, one can investigate dynamic phenomena at the femtosecond time scale. In this thesis work, I present the lenless imaging experiments using XUV radiation provided by a laser driven high order harmonic beamline. The manuscript is composed of an introduction, a chapter of theoretical background, three chapters of main research work and a general conclusion with perspectives. The first part of this work concerns the development of the harmonic beamline to optimize the illumination condition for lensless imaging. The second part concentrates on the imaging techniques: the Coherent Diffraction Imaging (CDI), the Fourier Transform Holography (FTH) and the Holography using extended references (HERALDO). The reconstructions have achieved 78 nm spatial resolution in case of CDI and 112 nm resolution in case of HERALDO, both in single-shot regime corresponding to a temporal resolution of 20 fs. The third part presents the first physical application on the harmonic beamline using the lensless imaging. Samples with magnetic nano-domains have been studied with sub-100 nm spatial resolution, which paves the way for ultrafast magnetic dynamic studies. At the end, single-shot 3D imaging and further beamline development have been discussed
Wang, Fan. "Imagerie nanométrique 2D et 3D ultrarapide par diffraction cohérente". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112226/document.
Texto completoCoherent diffraction is an amazing art by its experimental simplicity: a coherent XUV source illuminates a single, isolated sample, and the diffraction pattern of the object is recorded by a CCD camera. An inversion of the diffraction pattern to an image in real space is possible through an approach based on iterative algorithms. The techniques for Fourier transform holography, for which reference is placed near the object to be imaged, allow the direct reconstruction of the image, even when the quality of the experimental data is worse. We have a laboratory sufficiently intense compact XUV source for this type of experience. The ultrashort XUV pulses (from femtosecond to attosecond) are produced by selecting high order harmonics of a femtosecond infrared laser which is focused into a cell of rare gas. We recently demonstrated the feasibility of using this source for coherent diffraction imaging with a spatial resolution of 78 nm. Furthermore, we demonstrated experimentally a holographic technique with extended reference and obtained a resolution of 110 nm in single shot (i.e. an integration time of 20 femtoseconds). A perception of an object in three dimensions gives us a better understanding thereof. A nanoscale 3D imaging techniques are from tomographic techniques of electron microscopy. However, many shots required (from different angles) make these techniques obsolete during the study time-resolved irreversible phenomena on non-reproducible samples. In this context, the aim of my thesis is to extend the 2D imaging techniques for 3D perception of nanoscale (physical, biological ) objects, while preserving the ultrafast appearance. The development of a new technology of 3D coherent imaging in single view, named ‘ankylography’, proposed by Professor Miao J. UCLA [Raines et al., Nature 2010] was made in progress. This technique allows reconstructing a 3D image of the sample after a single diffraction image. Its basic principle is to find the depth of a 3D object by the longitudinal constructive interference. However, this technique is more requested in both the quality of experimental data and the computer hardware and analysis. The other idea for 3D imaging is to imitate human vision using two coherent beams X arriving simultaneously on the sample but with a small angle. In this scheme, we use references near the target object (i.e. holography) to improve the signal to noise ratio in the diffraction pattern (hologram). Two holograms are then collected on the same detector. The inverse Fourier of each hologram forms two images from different views of the object. Parallax is thus produced. The stereo reconstruction of the object is performed by computer. Finally, the demonstration of applications will be considered after my thesis. This imaging of biological objects (such as nanoplanktons already collected and prepared CEA). And we are also interested in the study of 3D nanoscale objects (azo-polymers) movement on ultrashort time. Furthermore, another important application will be to study the ultra-fast phase transition such as nano-magnetic field where demagnetization phenomena induced by femtosecond pulse occurs
Mastropietro, Francesca. "Imagerie de nanofils uniques par diffraction cohérente des rayons X". Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00716410.
Texto completoGuillermin, Régine. "Caractérisation d'objets enfouis dans des sédiments marins par imagerie acoustique". Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX22068.
Texto completoCassin, Rémy. "Imagerie nanométrique ultra-rapide par diffraction cohérente de rayonnement XUV produit par génération d'harmoniques d'ordre élevés". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS591/document.
Texto completoThe aim of this dissertation is todevelop new lensless single shot imagingtechnique in 2D and 3D with XUV harmonicsources which can be applied to study biologicalobjects and phase objects. Firstly, we introducethe theory underlying lensless imagingtechniques and we describe the methods usedduring this thesis to reconstruct the light fielddiffracted by the studied object. The imagingtechniques are split in two categories: iterativeand holographic. The iterative methodsreconstruct the phase of the diffracted wavefront using constraints in the Fourier space andthe reel space. With the holographic techniques,the phase is encoded directly in the interferencefringes between the reference and the objectwithin the diffraction pattern. We discuss theexperimental parameters required to achieve animage reconstruction and we compare therespective advantages of the two types ofmethod. Then, we describe the experimentalparameters of the XUV beam produced by highharmonic generation (HHG) and we brieflyexplain the theory of the HHG. The next sectiondiscusses the parameters the quality of thereconstructed image. We show how to improvethe resolution and the signal to noise ratio usingthe HERALDO technique in the low fluxregime.We then show the result of a new technique forthe single shot characterization of the spatialcoherence of XUV beams. Indeed, the spatialcoherence is a critical parameter for coherentdiffractive imaging techniques. Using a NRA ofreference holes, we measure the spatialcoherence for each distance between each pairof holes, without the knowledge of the intensitydistribution on the sample. We show that thespatial coherence has a gaussian distribution andthat its diameter varies according to thegeneration parameters of the harmonic beam.We also study quantitatively the effect of multishotsaccumulation of the diffraction pattern onthe apparent coherence of the beam. We alsoshow the result of phase object imaging usingcoherent diffractive imaging with a harmonicsource. To our knowledge, this if the first timesuch result has been achieved. The rest of thedissertation present new lensless imaging 3Dtechniques using harmonic sources. The first ofthe last two experiments shown is a lenslesssingle shot stereo 3D technique. It is the first oneallowing a 3D reconstruction from a singleacquisition, with a nanometer spatial resolutionand a femtosecond temporal resolution, withoutusing \textit{a priori} knowledge of the samplestudied. This method has a vast spectrum ofapplication and is particularly interesting for thestructural study of biological sample sensitive toradiation damage and for the study of nonreversibledynamical phenomena in 3D.Furthermore, this can easily be implemented inFELs and synchrotrons to reach even betterspatial resolution. The second 3D experimentshown in this thesis is a proof of concept ofcryptotomography using a high harmonic sourcein a low flux regime. To reconstruct the 3Dvolume of the sample, cryptotomographie usesdiffraction pattern acquired for unknown sampleorientations and therefore non-classified. Thelow flux regime used here simulate the flux of aharmonic source generated in the water window.We conclude from this experiment that, with theproper experimental conditions, the diffractionsignal is sufficient to allow the classification byorientation of the diffraction patterns. Withenough diffraction pattern and angles of thesample recorded, we can achieve a 3Dreconstruction of the sample. This result impliesthat the cryptotomography of biological objectsusing a water window harmonic source ispossible
Herail, Christophe. "Etude et réalisation d'un système de mesure rapide de champs acoustiques : applications à l'imagerie médicale en tomographie par diffraction". Paris 11, 1989. http://www.theses.fr/1989PA112194.
Texto completoThis thesis contributes to the experimental study of ultrasound imaging with the so-called diffraction tomography method in which the diffraction phenomena inside the object under investigation are taken into account. The work was carried out in three steps: - Implementing a linear network of electronically scanned sensors within an ongoing experiment and solving the problem of inter-element coupling. - Designing and making a new electronic device in order to measure the acoustical pressure field then exploited by a microcomputer which both drives the experimental set-up and computes the images. This device was carefully conceived and made, so as to obtain performances (e. G. Noise level, accuracy, temperature stability) compatible with the requirement of the reconstruction method. - Conducting various experiments on objects of simple shapes (phantoms) and on a real biological object, and last, carrying out a qualitative study of thermography with differential imaging
Gauthier, David. "Imagerie nanométrique ultra-rapide par diffraction cohérente de rayonnement extrême-UV produit par génération d'harmoniques d'ordre élevé". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00734344.
Texto completoVarlet, Joël. "Microstructure et propriétés mécaniques d'alliages de polymères polypropylène - polyamide 12 stabilisés par un tiers corps". Lyon, INSA, 1990. http://www.theses.fr/1990ISAL0071.
Texto completo[The blends have been studied by means of variations complementary techniques in order to obtain information on several levels of the microstructure:-The crystal lattice level (scale of a few Angstroms), the crystalline regions level (scale of a few hundred of Angstroms), and the homopolymers regions level (scale of a few microns). - By X-ray techniques (eg W. A. X. S. And S. A. X. S. ), we have characterized an orientation of the crystalline phases which occur in. The samples as a result of the injection-moulding preparation technique. The mechanical spectrometry and scanning electron microscopy results have been combined to show the specific geometrical arrangement of the homopolymer regions, as well as the changes that occur in these regions as they are mixed. Nucleating effects of the third component (TC) on the crystalline phase of polypropylene have been detected. The microstructural information thus obtained was used to interpret the main features of the large deformation response of the blends, such as its anisotropic nature and the large influence of TC]
Capítulos de libros sobre el tema "Imagerie de Microstructure par Diffraction"
GENTILS, Aurélie, Stéphanie JUBLOT-LECLERC y Patrick SIMON. "Caractérisation des dommages d’irradiation". En Les matériaux du nucléaire sous irradiation, 273–96. ISTE Group, 2024. http://dx.doi.org/10.51926/iste.9148.ch10.
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