Bibliografías temáticas / Tomography in-situ

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Literatura académica sobre el tema "Tomography in-situ"

Autor: Grafiati
Publicado: 11 de marzo de 2023

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Tesis sobre el tema "Tomography in-situ"

1

Jailin, Clément. "Projection-based in-situ 4D mechanical testing." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLN034/document.

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L'analyse quantitative de volumes 3D obtenus par tomographie permet l’identification et la validation de modèles. La séquence d’analyse consiste en trois problèmes inverses successifs : (i) reconstruction des volumes (ii) mesure cinématique par corrélation d'images volumiques (DVC) et (iii) identification. Les très longs temps d’acquisition nécessaires interdisent de capter des phénomènes rapides. Une méthode de mesures, Projection-based Digital Volume Correlation (P-DVC), raccourcit la séquence précédente en identifiant les quantités clés sur les projections. Cette technique réduit jusqu'à 2
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2

Arnold, Klaus, Astrid Ziemann, and Armin Raabe. "Acoustic tomography in comparision to in-situ temperature and wind measurements." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-216523.

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Acoustic travel time tomography is presented as an experimental technique for remote monitoring of areally averaged meteorological quantities as the air temperature and the horizontal wind speed. This ground based remote sensing technique uses the nearly horizontal propagation of sound waves in the atmospheric surface layer. Here the acoustic travel time tomography was applied by measuring the travel time at defined propagation paths between several sound sources and receivers. The resulting sound speed were used to obtain estimates of the meteorological parameters. A measuring campaign was ca
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3

Arnold, Klaus, Astrid Ziemann, and Armin Raabe. "Acoustic tomography in comparision to in-situ temperature and wind measurements." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 22 = Meteorologische Arbeiten aus Leipzig ; 6 (2001), S. 60-68, 2001. https://ul.qucosa.de/id/qucosa%3A15201.

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Acoustic travel time tomography is presented as an experimental technique for remote monitoring of areally averaged meteorological quantities as the air temperature and the horizontal wind speed. This ground based remote sensing technique uses the nearly horizontal propagation of sound waves in the atmospheric surface layer. Here the acoustic travel time tomography was applied by measuring the travel time at defined propagation paths between several sound sources and receivers. The resulting sound speed were used to obtain estimates of the meteorological parameters. A measuring campaign was ca
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4

Kareh, Kristina Maria. "In situ synchrotron tomography of granular deformation in semi-solid Al-Cu alloys." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/29367.

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Optimising casting routes involving semi-solid deformation such as semi-solid processing and high-pressure die casting requires a fundamental understanding of the globule-scale mechanisms behind the macroscopic rheological behaviour. This thesis uses time-resolved 3D imaging to directly observe and measure semi-solid alloy deformation from a microstructural perspective. Under isothermal conditions and constant strain rates, deformation mechanisms both at the crystal scale and at the specimen scale were identified during deformation in globular Al-Cu alloys at 64-93% solid. Imaging and quantify
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5

Ando, Edward. "Experimental investigation of microstructural changes in deforming granular media using x-ray tomography." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI097/document.

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Cette thèse présente un travail expérimental dans le domaine de la mécanique des milieux granulaires.Ce travail introduit une nouveauté fondamentale: durant la déformation d’échantillonsde sable en compression triaxiale classique, leur micro-structure est enregistrée par tomographieà rayons-x en environ 15 étapes de déformation différentes.Afin que tous les grains d’un échantillon soient individuellement visibles dans les imagesde tomographie, les échantillons sont considérablement réduits pour qu’ils mesurent 11 mm endiamètre et 22 mm en hauteur. Cela permet d’identifier et d’individualiser t
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6

Philippe, Julien. "Développement d'une presse portative pour les études in et ex situ sous conditions extrêmes de pression, température et déformation." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066008.

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Les hautes pressions sont précieuses à plusieurs disciplines scientifiques. Ce sera le cas dans cette thèse avec le développement d'un nouvel appareil permettant des possibilités inédites de tomographie et de déformation sous haute pression et haute température. Il apporte la possibilité de nouvelles études scientifiques dans les différents champs disciplinaires que sont les sciences de la Terre, la chimie mécanique, la physique des matériaux et la physique des liquides<br>High pressures are essential in several scientific field. This will be the case in this thesis with the development of a n
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7

Renner, Axel, Uwe Marschner, and Wolf-Joachim Fischer. "A new imaging approach for in situ and ex situ inspections of conductive fiber–reinforced composites by magnetic induction tomography." Sage, 2014. https://tud.qucosa.de/id/qucosa%3A35619.

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Fiber-reinforced plastics for industrial applications face constantly increasing demands regarding efficiency, reliability, and economy. Furthermore, it was shown that fiber-reinforced plastics with tailored reinforcements are superior to metallic or monolithic materials. However, a trustworthy description of the load-specific failure behavior and damage evolution of composite structures can hardly be given, because these processes are very complex and are still not entirely understood. Among other things, several research groups have shown that material damages like fiber fracture, delaminati
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8

Tireira, Aly. "Endommagement dans les alliages AlSi12 pour moteurs automobiles : Observations in situ et modélisation micromécanique." Thesis, Saint-Etienne, EMSE, 2015. http://www.theses.fr/2015EMSE0780/document.

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Cette thèse s'intéresse aux mécanismes de déformations et d’endommagement dans les alliages de coulée pour l’industrie automobile. Les études ont porté sur un alliage modèle contenant 12% de silicium et des éléments d’addition. Il a été fabriqué par le procédé squeeze-casting (coulée sous haute pression) au LKR de l’Université Technologique de Vienne avec laquelle cette thèse s’est déroulée en collaboration. Des essais de traction in situ dans le MEB ainsi que sous tomographie aux rayons X ont permis de suivre l’évolution des microstructures pendant le chargement. Une attention particulière a
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9

Ren, Wenyuan. "In-situ X-ray computed tomography characterisation and mesoscale image based fracture modelling of concrete." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/insitu-xray-computed-tomography-characterisation-and-mesoscale-image-based-fracture-modelling-of-concrete(3307ca0b-b492-4bfc-91f7-61c092b21707).html.

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This study develops a 3D meso-scale fracture characterisation and modelling framework for better understanding of the failure mechanisms in concrete, by combining in-situ micro-scale X-ray computed tomography (XCT) experiments and XCT image-based finite element (FE) simulations. Firstly, sophisticated in-situ XCT experiments are conducted on concrete cubes under Brazilian-like, uniaxial and cyclic compression. Proper procedures for XCT image reconstruction and multi-phasic segmentation are identified. The fracture evolution at different loading stages is characterised and visualised as well as
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10

Cai, Biao. "In situ synchrotron tomographic quantification of semi-solid properties of aluminum-copper alloys." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/in-situ-synchrotron-tomographic-quantification-of-semisolid-properties-of-aluminumcopper-alloys(60c222d0-7e70-4a1e-9ed4-75b8f559d5de).html.

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Semi-solid deformation mechanisms are important in a range of manufacturing and natural phenomena, which range from squeeze casting to magma flows. In this thesis, using high speed synchrotron X-ray tomography and a bespoke precision thermo-mechanical rig, a four dimensional (3D plus time) quantitative investigation was performed to study the mechanical / rheological behavior of semi-solid Al-Cu alloys. Various deformation techniques, namely, isothermal semi-solid compression, extrusion and indentation were used. The time-resolved dynamic 3D images were analyzed with the help of novel image qu
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