Letteratura scientifica selezionata sul tema "Gradient discontinuity"
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Articoli di riviste sul tema "Gradient discontinuity":
Zakharov, S. V., e A. M. Il'in. "From weak discontinuity to gradient catastrophe". Sbornik: Mathematics 192, n. 10 (31 ottobre 2001): 1417–33. http://dx.doi.org/10.1070/sm2001v192n10abeh000599.
Carriero, M., A. Leaci e F. Tomarelli. "Free gradient discontinuity and image inpainting". Journal of Mathematical Sciences 181, n. 6 (marzo 2012): 805–19. http://dx.doi.org/10.1007/s10958-012-0716-4.
Liu, Yahong, Meize Li, Kun Song, Yuhao Jing, Jiale Guo, Qingyu Hai e Xiaopeng Zhao. "Broadband gradient phase discontinuity all-dielectric metasurface". Modern Physics Letters B 34, n. 15 (30 marzo 2020): 2050168. http://dx.doi.org/10.1142/s0217984920501687.
Brill, J. P. "Discontinuities in the Orkiszewski Correlation for Predicting Pressure Gradients in Wells". Journal of Energy Resources Technology 111, n. 1 (1 marzo 1989): 34–36. http://dx.doi.org/10.1115/1.3231398.
Gobbino, Massimo, e Maria Giovanna Mora. "Finite-difference approximation of free-discontinuity problems". Proceedings of the Royal Society of Edinburgh: Section A Mathematics 131, n. 3 (giugno 2001): 567–95. http://dx.doi.org/10.1017/s0308210500001001.
Gobbino, Massimo, e Maria Giovanna Mora. "Finite-difference approximation of free-discontinuity problems". Proceedings of the Royal Society of Edinburgh: Section A Mathematics 131, n. 3 (giugno 2001): 567–95. http://dx.doi.org/10.1017/s0308210501000257.
Aifantis,, K. E., e H. Askes,. "Gradient Elasticity with Interfaces as Surfaces of Discontinuity for the Strain Gradient". Journal of the Mechanical Behavior of Materials 18, n. 4 (agosto 2007): 283–306. http://dx.doi.org/10.1515/jmbm.2007.18.4.283.
Liu, Yahong, Congcong Liu, Kun Song, Meize Li e Xiaopeng Zhao. "A broadband high-transmission gradient phase discontinuity metasurface". Journal of Physics D: Applied Physics 51, n. 9 (12 febbraio 2018): 095103. http://dx.doi.org/10.1088/1361-6463/aaa92d.
Saadon-Grosman, Noam, Zohar Tal, Eyal Itshayek, Amir Amedi e Shahar Arzy. "Discontinuity of cortical gradients reflects sensory impairment". Proceedings of the National Academy of Sciences 112, n. 52 (11 dicembre 2015): 16024–29. http://dx.doi.org/10.1073/pnas.1506214112.
Acharya, Amit, Huang Tang, Sunil Saigal e John L. Bassani. "On boundary conditions and plastic strain-gradient discontinuity in lower-order gradient plasticity". Journal of the Mechanics and Physics of Solids 52, n. 8 (agosto 2004): 1793–826. http://dx.doi.org/10.1016/j.jmps.2004.02.005.
Tesi sul tema "Gradient discontinuity":
Khazraj, Kaoutar. "Paramétrisation hybride champ/objet et inversion full-wave hybride de données sismiques de puits dans un contexte subsalt". Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1267.
Seismic imaging techniques play a crucial role in the exploration and understanding of subsurface structures. In the field of petroleum exploration, subsalt zones present a challenge for conventional imaging techniques and full-wave inversion (FWI). The application of FWI to seismic well data is expected to overcome these challenges. The primary goal is to characterize hydrocarbon reservoirs that may be located beneath and alongside salt bodies. However, the context of well seismic imaging, combined with the challenges of imaging beneath and around salt bodies, requires the introduction of strong constraints into the geophysical inverse problem due to its underdetermined nature.This thesis presents a three-step approach to tackle these challenges. Firstly, it suggests incorporating extit{a priori} geological information into the inversion process by defining geological objects bounded by discontinuities. Secondly, it aims to formalize and compute the gradient with respect to the geometric parameters that define these discontinuities. Thirdly, it proposes the implementation of a hybrid full-wave inversion algorithm that combines field and object-based approaches. This hybrid FWI utilizes both the gradient of physical fields and the gradient relative to geometric parameters.The thesis content is divided into four distinct chapters. The first chapter introduces the fundamental concepts used in the hybrid FWI algorithm. It highlights the approach based on a dual representation of interfaces (explicit/implicit) using deformable unstructured meshes for the explicit discretization of discontinuities and the level-set method for the implicit representation of the geological objects in the inverse problem. Chapter 2 describes the development steps of a software platform for the numerical implementation of these approaches and the execution of hybrid FWI tests. This software platform includes a wave propagation modeling code based on the spectral elements method and an inversion code based on the gradient computation using the Green's function method, with a probabilistic approach to the inverse problem. The third chapter outlines the various stages of the geometric FWI algorithm and its application to well seismic data to estimate the position of salt/sediment interfaces in 2D environments. Finally, the fourth chapter presents the hybrid inversion algorithm and its implementation with well seismic data to estimate the velocities of compression and shear waves, as well as the position of salt body boundaries in 2D environments. The results of the presented numerical tests are promising, validating our hybrid inversion approach
Kawagoe, Daisuke. "Regularity of solutions to the stationary transport equation with the incoming boundary data". Kyoto University, 2018. http://hdl.handle.net/2433/232413.
Wilke, Daniel Nicolas. "Approaches to accommodate remeshing in shape optimization". Thesis, University of Pretoria, 2010. http://hdl.handle.net/2263/24270.
Thesis (PhD)--University of Pretoria, 2011.
Mechanical and Aeronautical Engineering
unrestricted
Souchotte, Pascal. "Pressions pariétales induites par des discontinuités de surface soumises à un gradient de pression externe : applications à l'automobile". Ecully, Ecole centrale de Lyon, 1999. http://www.theses.fr/1999ECDL0027.
Wall pressure fluctuations inducted by a surface roughness in adverse pressure gradient: Automobile applications Wall pressure fluctuations near isolated singularities under an adverse mean pressure gradient are experimentally investigated. A new concept of anechoic wind tunnel is designed in order to obtain a channel flow which is representative of the flow around a given region of a real car. The experiment is carried out in two phases: first, the flow around a singularity is examined under an unperturbed mean flow, the singularities being a backward facing step; second, singularities like windshield joints or roof antennas are placed into the adverse pressure gradient flow which mimics the around the upper side of the car. An extensive data base is provided both as validation tool for computer programs and as input for vibro-acoustic models. Furthermore results give a new insight into the physics of flow reattachment
Shunde, Yin. "Geomechanics-Reservoir Modeling by Displacement Discontinuity-Finite Element Method". Thesis, 2008. http://hdl.handle.net/10012/3826.
Libri sul tema "Gradient discontinuity":
Geological Survey (U.S.), a cura di. Combining edge-gradient information to improve adaptive discontinuity-preserving smoothing of multispectral images. Reston, VA (521 National Center, Reston 22092): U.S. Geological Survey, 1994.
Geological Survey (U.S.), a cura di. Combining edge-gradient information to improve adaptive discontinuity-preserving smoothing of multispectral images. Reston, VA (521 National Center, Reston 22092): U.S. Geological Survey, 1994.
Geological Survey (U.S.), a cura di. Combining edge-gradient information to improve adaptive discontinuity-preserving smoothing of multispectral images. Reston, VA (521 National Center, Reston 22092): U.S. Geological Survey, 1994.
Geological Survey (U.S.), a cura di. Combining edge-gradient information to improve adaptive discontinuity-preserving smoothing of multispectral images. Reston, VA (521 National Center, Reston 22092): U.S. Geological Survey, 1994.
Combining edge-gradient information to improve adaptive discontinuity-preserving smoothing of multispectral images. Reston, VA (521 National Center, Reston 22092): U.S. Geological Survey, 1994.
Combining edge-gradient information to improve adaptive discontinuity-preserving smoothing of multispectral images. Reston, VA (521 National Center, Reston 22092): U.S. Geological Survey, 1994.
Capitoli di libri sul tema "Gradient discontinuity":
Carriero, Michele, Antonio Leaci e Franco Tomarelli. "Local Minimizers for a Free Gradient Discontinuity Problem in Image Segmentation". In Variational Methods for Discontinuous Structures, 67–80. Basel: Birkhäuser Basel, 2002. http://dx.doi.org/10.1007/978-3-0348-8193-7_5.
Vatulyan, Alexander O., Sergey A. Nesterov, Victor O. Yurov e Oksana V. Yavruyan. "On the Structure of Solutions in the Vicinity of Discontinuity of Boundary Conditions for Gradient Models". In Advanced Structured Materials, 687–98. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-26186-2_42.
Imre, E., J. Szendefy, J. Lőrincz, P. Q. Trang e Vijay P. Singh. "On the Effect of Soil Modification with Lime Using Grading Entropy". In Discrete Element Modelling of Particulate Media, 271–79. The Royal Society of Chemistry, 2012. http://dx.doi.org/10.1039/bk9781849733601-00271.
Atti di convegni sul tema "Gradient discontinuity":
Vallecchi, A., S. Hubert, A. Schuchinsky e C. Craeye. "Phase gradient discontinuity metasurface with intertwined spiral arrays". In 2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS). IEEE, 2016. http://dx.doi.org/10.1109/metamaterials.2016.7746407.
Cosimo, Alejandro, V´ıctor Fachinotti e Alberto Cardona. "TEMPERATURE GRADIENT DISCONTINUITY AWARE NUMERICAL SCHEME FOR SOLIDIFICATION PROBLEMS". In 10th World Congress on Computational Mechanics. São Paulo: Editora Edgard Blücher, 2014. http://dx.doi.org/10.5151/meceng-wccm2012-18375.
Li, Yuebing, Jianwei Zhu, Shiyi Bao e Zengliang Gao. "Analysis on Ultimate Load Capacity of Cylinder With Local Discontinuity Under High Temperature Gradient". In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-29051.
Shaikh, J. A., K. Murata, H. Kuramata e H. K. Mogensen. "Impact of a Vertical Temperature Gradient on H2S Gradient in Sour, Near-Critical Reservoir Fluids". In SPE Conference at Oman Petroleum & Energy Show. SPE, 2024. http://dx.doi.org/10.2118/218801-ms.
Asadkarami, Ali, e Wolf Reinhardt. "Shakedown at Thermal Discontinuities Involving Thermal Membrane and Thermal Bending Stress". In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78660.
Bayoumy, Ahmed H., Ayman A. Nada e Said M. Megahed. "Modeling Slope Discontinuity of Large Size Wind-Turbine Blade Using Absolute Nodal Coordinate Formulation". In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70467.
Enakoutsa, Koffi, Fazle R. Ahad, Kiran N. Solanki, Yustianto Tjiptowidjojo e Douglas J. Bammann. "Localization Effects in Bammann-Chiesa-Johnson Metals With Damage Delocalization". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65935.
Gajjar, Margi, e Himanshu Pathak. "XFEM Fracture Analysis of 2-D Plastically Graded Domain With Thermo-Mechanical J-Integral". In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23355.
Ogata, Hideki. "Thermohydrodynamic Lubrication Analysis of Slider Bearings With Steps on Bearing Surface". In ASME/STLE 2009 International Joint Tribology Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ijtc2009-15144.
Mohammadi-Araz, Pishdad. "Finite Element Analysis and Stress Intensification Factor Determination for Core to Jacket Joints". In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-78007.