Littérature scientifique sur le sujet « Tomography and anisotropy »
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Articles de revues sur le sujet "Tomography and anisotropy"
Carrion, Philip, Jesse Costa, Jose E. Ferrer Pinheiro et Michael Schoenberg. « Cross‐borehole tomography in anisotropic media ». GEOPHYSICS 57, no 9 (septembre 1992) : 1194–98. http://dx.doi.org/10.1190/1.1443333.
Texte intégralKoren, Zvi, Igor Ravve, Gladys Gonzalez et Dan Kosloff. « Anisotropic local tomography ». GEOPHYSICS 73, no 5 (septembre 2008) : VE75—VE92. http://dx.doi.org/10.1190/1.2953979.
Texte intégralPratt, R. G., W. J. McGaughey et C. H. Chapman. « Anisotropic velocity tomography : A case study in a near‐surface rock mass ». GEOPHYSICS 58, no 12 (décembre 1993) : 1748–63. http://dx.doi.org/10.1190/1.1443389.
Texte intégralZhou, Chaoguang, Junru Jiao, Sonny Lin, John Sherwood et Sverre Brandsberg-Dahl. « Multiparameter joint tomography for TTI model building ». GEOPHYSICS 76, no 5 (septembre 2011) : WB183—WB190. http://dx.doi.org/10.1190/geo2010-0395.1.
Texte intégralHadden, Shaun, R. Gerhard Pratt et Brendan Smithyman. « Anisotropic full-waveform inversion of crosshole seismic data : A vertical symmetry axis field data application ». GEOPHYSICS 84, no 1 (1 janvier 2019) : B15—B32. http://dx.doi.org/10.1190/geo2017-0790.1.
Texte intégralMichelena, Reinaldo J. « Singular value decomposition for cross‐well tomography ». GEOPHYSICS 58, no 11 (novembre 1993) : 1655–61. http://dx.doi.org/10.1190/1.1443381.
Texte intégralGao, Zirui, Manuel Guizar-Sicairos, Viviane Lutz-Bueno, Aileen Schröter, Marianne Liebi, Markus Rudin et Marios Georgiadis. « High-speed tensor tomography : iterative reconstruction tensor tomography (IRTT) algorithm ». Acta Crystallographica Section A Foundations and Advances 75, no 2 (6 février 2019) : 223–38. http://dx.doi.org/10.1107/s2053273318017394.
Texte intégralLeinss, S., H. Löwe, M. Proksch, J. Lemmetyinen, A. Wiesmann et I. Hajnsek. « Anisotropy of seasonal snow measured by polarimetric phase differences in radar time series ». Cryosphere Discussions 9, no 6 (5 novembre 2015) : 6061–123. http://dx.doi.org/10.5194/tcd-9-6061-2015.
Texte intégralPratt, R. Gerhard, et Mark S. Sams. « Reconciliation of crosshole seismic velocities with well information in a layered sedimentary environment ». GEOPHYSICS 61, no 2 (mars 1996) : 549–60. http://dx.doi.org/10.1190/1.1443981.
Texte intégralHan, S.-M., et J.-Y. Rho. « Dependence of broadband ultrasound attenuation on the elastic anisotropy of trabecular bone ». Proceedings of the Institution of Mechanical Engineers, Part H : Journal of Engineering in Medicine 212, no 3 (1 mars 1998) : 223–26. http://dx.doi.org/10.1243/0954411981534006.
Texte intégralThèses sur le sujet "Tomography and anisotropy"
Zhang, Qie Sandvol Eric Alan. « Seismic tomography and anisotropy : studies of intraplate seismic zones ». Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6855.
Texte intégralSegovia-Martinez, Manuel. « Texture anisotropy analysis of brain scans ». Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/844053/.
Texte intégralHammond, William Charles. « Dynamics, flow and melt content of the Southern East Pacific Rise upper mantle from teleseismic tomography / ». view abstract or download file of text, 2000. http://wwwlib.umi.com/cr/uoregon/fullcit?p9998033.
Texte intégralTypescript. Includes vita and abstract. Includes bibliographical references (leaves 139-151). Also available for download via the World Wide Web; free to University of Oregon users.
Huang, Hui Ph D. Massachusetts Institute of Technology. « Ambient noise tomography for wavespeed and anisotropy in the crust of southwestern China ». Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87518.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references.
The primary objective of this thesis is to improve our understanding of the crustal structure and deformation in the southeastern Tibetan Plateau and adjacent regions using surface wave tomography. Green's functions for Rayleigh and Love waves are extracted from ambient noise interferometry. Using the Green's functions, we first conduct traditional traveltime tomography for the two shear wavespeeds Vsv and Vsh Their differences are measured as radial anisotropy. We then conduct Eikonal tomography to study azimuthal anisotropy in the crust. Our tomography results are well consistent with geology in the study region. In the Sichuan Basin, low wavespeed and positive radial anisotropy (Vsh> Vsv) in the upper crust reflect thick sedimentary layers at surface; high wavespeed and small radial anisotropy in the middle and lower crust reflect a cold and rigid basin root. Little azimuthal anisotropy is observed in the Basin, indicating small internal deformation. In the Tibetan Plateau, we observe widespread low wavespeed zones with positive anisotropy in the middle and lower crust, which may reflect combined effects of weakened rock mechanism and horizontal flow in the deep crust of southeastern Tibet. The northern part of the Central Yunnan block, which geographically coincides with the inner zone of the Emeishan flood basalt, reveals relatively higher wavespeeds than the surrounding regions and little radial anisotropy throughout the entire crust. We speculate that the high wavespeeds and small radial anisotropy are due to combined effects of the remnants of intruded material from mantle with sub-vertical structures and channel flow with sub-horizontal structures. In general, the azimuthal anisotropy in our study region is consistent with a clockwise rotation around the Eastern Himalayan Syntaxis. Careful examination reveals large angular differences between the azimuthal anisotropy in the upper and lower crust, suggesting different deformation patterns at the surface and in depth. Therefore, our tomography results support models with ductile flow in the deep crust of the southeastern Tibetan Plateau; however, the large lateral variation of both wavespeeds and anisotropy indicates that the flow also varies greatly in intensity and pattern in different geological units.
by Hui Huang.
Ph. D.
Bui, Truong Son. « Caractérisation et modélisation de l’endommagement des géomatériaux par méthode ultrasonore ». Thesis, Orléans, 2014. http://www.theses.fr/2014ORLE2018/document.
Texte intégralThis research is devoted to study the damage of geomaterials using the nondestructive method like ultrasound. To this aim, we develop in the first step a modern and innovative system of ultrasound which, in combining with a mechanical system, can characterize the process of damage in material during the tests such as uniaxial/triaxial compression. More specifically, our ultrasonic system comprises 96 channels and can be able to measure continuously the three types of waves thanks to the specific piezoelectric sensors.The application of the developped system for characterization of the damage of a cement-based géomatériaux showed the efficacy of this approach. Under uniaxial loading, the evolution of the ultrasonic velocities and the attenuation of three types of wave have been detected as a result of damage within the material.We are interested in the second step the application of the ultrasonic system on the tomography (such as the velocities and attenuation) of damage during loading of materials. The study on some mortar specimens give good agreement between the obtained results and the observations, especially at failure , although the resolution is fairly coarse. The last part of this research is to model the damage of material by using a so-called up-scaling approach. A conceptual model is proposed for this type of material that allows to take into account two main damage mechanisms: crack in the cement matrix and debonding effect between the matrix and inclusions. Via a scheme of homogenization in two steps, the impact of such mechanisms on the evolution of velocities of the ultrasonic waves has been elucidated. The comparison of numerical predictions with experimental results allows validating the model
Salaun, Gwénaëlle. « Structure et déformation du manteau supérieur de la région Egée-Anatolie par tomographie en ondes de Rayleigh ». Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENU025/document.
Texte intégralThe last ~40 M.y. tectonics of the Aegean-Anatolia region has shaped a natural laboratory ideal to study the continental deformation processes. The detailed analysis of the mantle structure and deformation of this non-mature continental collision zone constitutes an essential step to investigate the contribution of mantle dynamics to surface kinematics. The upper mantle structure is investigated over the entire region through a new 3-D S-wave velocity model from surface-wave tomography. The model reveals remarkable vertical correlations between geometries of the Hellenic slab tears and geometries of shear zones which accommodate the rapid SW movement of the Aegean bloc. The Cyprus slab is clearly identified in the 3-D model as fold and torn in tree segments beneath Anatolia. The observed azimuthal anisotropy from Rayleigh-wave array analysis suggests the existence of two anisotropic layers in the upper mantle. The lateral variations of anisotropy beneath the region are interpreted as the indication of toroidal mantle flows at different scales governing the slabs deformation and the surface kinematics
Paridis, Kyriakos Costas. « The inverse conductivity problem : anisotropy, finite elements and resistor networks ». Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/the-inverse-conductivity-problem-anisotropy-finite-elements-and-resistor-networks(db58b164-9b6e-45f3-b4b9-4f5935c40e48).html.
Texte intégralBurr, Alexis. « Investigation of pore closure during polar firn densification ». Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI089/document.
Texte intégralDensification from firn to ice is an essential phenomenon to understand for the interpretation of the climate record. A good knowledge of this mechanism enables the precise dating of the air embedded in the ice. The step at which the air becomes entrapped is the pore closure (or close-off). Because of gas flow in the firn column, the ice is older than the entrapped air. The difference between ice and gas is generally defined as Δage.Snow densification consists of grain rearrangements, sintering and viscoplastic deformation. Although the viscoplastic behaviour of the ice crystal is strongly anisotropic, densification models do not take into account this anisotropy. Firn also bears some granular characteristics that may affect its densification. The interactions between pore closure and microstructural mechanisms in the firn are still misunderstood.The aim of this PhD thesis is to incorporate both the granular aspect of firn and its anisotropy into an innovating approach of firn densification modelling. The mutual indentation of viscoplastic monocrystalline ice cylinders was experimentally carried out to propose a contact law that is based on indentation theory and that takes into account the preferential viscoplastic deformation on the basal plane. We have integrated this contact law into a DEM (Discrete Element Method) code for the prediction of firn densification.3D X-ray micro-tomography was performed on polar firn at different stages of the densification (ρ= 0.55-0.88 g/cm3) and depths (~23 to 130m). A thorough investigation of pore closure and of different morphological and physical parameters was achieved for the Dome C and the newly drilled Lock In polar sites. In addition to these ex situ analyses, in situ X-ray micro-mechanical experiments were carried out on firn extracted from Dome C in order to model its densification. Ex situ and in situ microstructural observations indicate significant differences that can be explained by the relatively large strain-rates imposed to the firn during in situ tests. These large strain rates allow for a decoupling of the effects of diffusion kinetics and of viscoplastic deformation. Their relative weights on the morphology of pores and on their closure are discussed. To measure pore closure, we propose a connectivity index, which is the ratio of the largest pore volume over the total pore volume. We show that this index is better suited for X-ray tomography analysis than the classic closed porosity ratio to predict the close-off density
Estève, Clément. « Evolution and Tectonics of the Lithosphere in Northwestern Canada ». Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41097.
Texte intégralVanderBeek, Brandon. « New Perspectives on Mid-Ocean Ridge Magmatic Systems and Deformation in the Uppermost Oceanic Mantle from Active- and Passive-Source Seismic Imaging in Cascadia ». Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24205.
Texte intégralLivres sur le sujet "Tomography and anisotropy"
J, Mezcua, et Carreño E, dir. Iberian lithosphere heterogeneity and anisotropy, ILIHA. Madrid : Instituto Geográfico Nacional, 1993.
Trouver le texte intégralLin, Yu-Pin. Isotropic and Anisotropic Seismic Tomography Using Active Source and Earthquake Records. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5068-8.
Texte intégralLin, Yu-Pin. Isotropic and Anisotropic Seismic Tomography Using Active Source and Earthquake Records. Springer, 2019.
Trouver le texte intégralIsotropic and Anisotropic Seismic Tomography Using Active Source and Earthquake Records. Springer, 2017.
Trouver le texte intégralChapitres de livres sur le sujet "Tomography and anisotropy"
Lin, Yu-Pin. « Full-Wave Multiscale Anisotropy Tomography in Southern California ». Dans Isotropic and Anisotropic Seismic Tomography Using Active Source and Earthquake Records, 71–88. Singapore : Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5068-8_5.
Texte intégralCreager, Kenneth C. « Inner core anisotropy and rotation ». Dans Earth's Deep Interior : Mineral Physics and Tomography From the Atomic to the Global Scale, 89–114. Washington, D. C. : American Geophysical Union, 2000. http://dx.doi.org/10.1029/gm117p0089.
Texte intégralRørvik, Stein, et Lorentz Petter Lossius. « Measurement of Anode Anisotropy by Micro X-Ray Computed Tomography ». Dans Light Metals 2019, 1293–99. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05864-7_159.
Texte intégralKendall, J.-M. « Seismic anisotropy in the boundary layers of the mantle ». Dans Earth's Deep Interior : Mineral Physics and Tomography From the Atomic to the Global Scale, 133–59. Washington, D. C. : American Geophysical Union, 2000. http://dx.doi.org/10.1029/gm117p0133.
Texte intégralMainprice, D., G. Barruol et W. Ben Ismaïl. « The Seismic anisotropy of the Earth's mantle : From single crystal to polycrystal ». Dans Earth's Deep Interior : Mineral Physics and Tomography From the Atomic to the Global Scale, 237–64. Washington, D. C. : American Geophysical Union, 2000. http://dx.doi.org/10.1029/gm117p0237.
Texte intégralMoreno, Rodrigo, Magnus Borga, Eva Klintström, Torkel Brismar et Örjan Smedby. « Anisotropy Estimation of Trabecular Bone in Gray-Scale : Comparison Between Cone Beam and Micro Computed Tomography Data ». Dans Lecture Notes in Computational Vision and Biomechanics, 207–20. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13407-9_13.
Texte intégralForte, Alessandro M. « Seismic-geodynamic constraints on mantle flow : Implications for layered convection, mantle viscosity, and seismic anisotropy in the deep mantle. » Dans Earth's Deep Interior : Mineral Physics and Tomography From the Atomic to the Global Scale, 3–36. Washington, D. C. : American Geophysical Union, 2000. http://dx.doi.org/10.1029/gm117p0003.
Texte intégralChandran, Vimal, Philippe Zysset et Mauricio Reyes. « Prediction of Trabecular Bone Anisotropy from Quantitative Computed Tomography Using Supervised Learning and a Novel Morphometric Feature Descriptor ». Dans Lecture Notes in Computer Science, 621–28. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24553-9_76.
Texte intégralJansen, D. P., T. Chow, D. A. Hutchins et R. P. Young. « Ultrasonic Tomographic Imaging of Anisotropic Solids ». Dans Acoustical Imaging, 59–63. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3370-2_10.
Texte intégralBodin, Thomas, Yann Capdeville, Barbara Romanowicz et Jean-Paul Montagner. « Interpreting Radial Anisotropy in Global and Regional Tomographic Models ». Dans The Earth's Heterogeneous Mantle, 105–44. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15627-9_4.
Texte intégralActes de conférences sur le sujet "Tomography and anisotropy"
Korta Martiartu, Naiara, Saule Simute, Christian Boehm, Lisa Ruby, Thomas Frauenfelder, Andreas Fichtner, Marga Rominger et Sergio J. Sanabria. « Speed-of-sound anisotropy estimation using reflector-based pulse-echo ultrasound ». Dans Ultrasonic Imaging and Tomography, sous la direction de Nicole V. Ruiter et Brett C. Byram. SPIE, 2021. http://dx.doi.org/10.1117/12.2580952.
Texte intégralKirby, Mitchell A., Peijun Tang, Maju Kuriakose, Matthew O’Donnell, Ruikang K. Wang, Russell Ettinger, Tam Pham et Ivan Pelivanov. « Probing Elastic Anisotropy in Human Skin in vivo with Acoustic micro-tapping OCE and Polarization-sensitive OCT ». Dans Optical Coherence Tomography. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/oct.2022.cs4e.3.
Texte intégralRudling, C. J., A. Riaz et J. Smith. « Azimuthal Anisotropy Resolved By Tilted Orthorhombic Tomography ». Dans First EAGE/PESGB Workshop on Velocities. Netherlands : EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201800002.
Texte intégralStekl, I., A. Umpleby et M. Warner. « Seismic anisotropy effects in 3D wavefield tomography ». Dans 72nd EAGE Conference and Exhibition - Workshops and Fieldtrips. European Association of Geoscientists & Engineers, 2010. http://dx.doi.org/10.3997/2214-4609.20149940.
Texte intégralRao, Y., et Y. H. Wang. « Crosshole Seismic Tomography Including the Anisotropy Effect ». Dans 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011. Netherlands : EAGE Publications BV, 2011. http://dx.doi.org/10.3997/2214-4609.20149052.
Texte intégralSoloviev, A. P., M. I. Perchenko et O. V. Zyuryukina. « Effect of scattering anisotropy on acoustooptic tomography signal ». Dans Saratov Fall Meeting and Workshop on Laser Physics and Photonics 2012, sous la direction de Valery V. Tuchin, Elina A. Genina, Vladimir L. Derbov et Igor V. Meglinski. SPIE, 2013. http://dx.doi.org/10.1117/12.2018942.
Texte intégralBreckon. « The Problem of Anisotropy in Electrical Impedance Tomography ». Dans Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.590118.
Texte intégralBreckon, William. « The problem of anisotropy in Electrical Impedance Tomography ». Dans 1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.5762015.
Texte intégralHossain, Murad, et Caterina M. Gallippi. « On the feasibility of quantifying mechanical anisotropy in transversely isotropic elastic materials using acoustic radiation force (ARF)-induced displacements ». Dans Ultrasonic Imaging and Tomography, sous la direction de Nicole V. Ruiter et Brett C. Byram. SPIE, 2019. http://dx.doi.org/10.1117/12.2511765.
Texte intégralUnnikrishnan, Ginu U., Glenn D. Barest, David B. Berry, Amira I. Hussein et Elise F. Morgan. « Influence of Specimen-Specific Trabecular Anisotropy on QCT-Based Finite Element Analyses of Lumbar Vertebra ». Dans ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80114.
Texte intégralRapports d'organisations sur le sujet "Tomography and anisotropy"
Bauer, K., C. Haberland, R. G. Pratt, F. Hou, B E Medioli et M. H. Weber. Ray-based cross-well tomography for P-wave velocity, anisotropy, and attenuation structure around the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2005. http://dx.doi.org/10.4095/220883.
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