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203136 ressources correspondant à votre recherche (Fil RSS)
Auteur: David, Guy, Engelstein, Max, Toro, Tatiana
Résumé: On étudie la régularité des frontière libres des presque-minimiseurs de la fonctionnelle$$J(u)=\int_\O |\nabla u(x)|^2 +q^2_+(x)\chi_{\{u>0\}}(x) +q^2_-(x)\chi_{\{u<0\}}(x)\ dx,$$où $q_\pm \in L^\infty(\O)$.Les presque-minimiseurs vérifient une in\'egalité variationnelle, mais pas une EDP ni une formule de monotonie comme le font les minimiseurs(voir \cite{AC}, \cite{ACF}, \cite{CJK}, \cite{W}).Néanmoins on démontre que, sous une hypothèse de ...
Auteur: Chinesta, Francisco, Ammar, Amine, Lemarchand, François, Beauchêne, P., Boust, Fabrice
Résumé: Industrial processes involving composite materials need for efficient numerical simulations in order to optimize the process parameters. Even if the thermo-mechanical models are nowadays well established, efficient simulations need for further developments. In this work we are addressing some of these issues, in particular the one related to fast solutions ...
Auteur: Ammar, Amine, Prulière, Etienne, Chinesta, Francisco, Laso, Manuel
Résumé: Kinetic theory models involving the Fokker-Planck equation can be accurately discretized using a mesh support (Finite Elements, Finite Differences, Finite Volumes, Spectral Techniques, ...). However, these techniques involve a high number of approximation functions. In the finite element framework, widely used in complex flow simulations, each approximation function has only ...
Auteur: Chinesta, Francisco, Ammar, Amine
Résumé: Ces dernières années, nous avons assisté à une impressionnante progression de la modélisation numérique aussi bien en sciences informatiques qu'en analyse des méthodes numériques. Par conséquent, de nouvelles échelles ont été explorées permettant ainsi la considération de modèles physiques plus riches et plus fins. Dans ce travail, on s'intéresse à ...
Auteur: Challa, Aditya, Danda, Sravan, Daya Sagar, B,, Najman, Laurent
Résumé: The problem of interpolation of images is defined as-given two images at time t = 0 and t = T, one must find the series of images for the intermediate time. This problem is not well posed, in the sense that without further constraints, there might be many solutions possible. ...
Auteur: Challa, Aditya, Danda, Sravan, Daya Sagar, B S, Najman, Laurent
Résumé: Classification of remotely sensed data is an important task for many practical applications. However, it is not always possible to get the ground truth for supervised learning methods. Thus unsupervised methods form a valuable tool in such situations. Such methods are referred to as clustering methods. There exists several strategies ...
Auteur: Potier, Rémy
Résumé: Suivre le « motif » de la jeunesse dans l’œuvre de W. Gombrowicz, témoigne de la nostalgie spécifique du regard que porte l’adulte sur un temps pour lui révolu. L’idéalisation de l’adolescence prise chez l’auteur permet d’envisager le regard de l’adulte, en mettant à jour le décalage avec lequel il ...
Auteur: Danda, Sravan, Challa, Aditya, Daya Sagar, B,, Najman, Laurent
Résumé: Edge-preserving image filtering is an important pre-processing step in many filtering applications. In this article, we analyse the basis of edge-preserving filters and also provide theoretical links between the MST filter, which is a recent state-of-art edge-preserving filter, and filters based on geodesics. We define shortest path filters, which are ...
Auteur: Treille, Avril, Vilain, Coriandre, Hueber, Thomas, Lamalle, Laurent, Sato, Marc
Résumé: Action recognition has been found to rely not only on sensory brain areas but also partly on the observer's motor system. However, whether distinct auditory and visual experiences of an action modulate sensorimotor activity remains largely unknown. In the present sparse sampling fMRI study, we determined to which extent sensory ...
Auteur: Reagor, Matthew, Pfaff, Wolfgang, Axline, Christopher, Heeres, Reinier W., Ofek, Nissim, Sliwa, Katrina, Holland, Eric, wang, chen, Blumoff, Jacob, Chou, Kevin, Hatridge, Michael J., Frunzio, Luigi, Devoret, Michel H., Jiang, Liang, Schoelkopf, Robert J.
Résumé: Significant advances in coherence have made superconducting quantum circuits a viable platform for fault-tolerant quantum computing. To further extend capabilities, highly coherent quantum systems could act as quantum memories for these circuits. A useful quantum memory must be rapidly addressable by qubits, while maintaining superior coherence. We demonstrate a novel ...
Auteur: Reimer, D,, Bulgarini, V, Fognini, D, Heeres, Reinier W., Witek, J,, Versteegh, V,, Rubino, D, Braun, P,, Kamp, P,, Höfling, P,, Dalacu, D, Lapointe, J,, Poole, P,, Zwiller, V
Résumé: One of the key challenges in developing quantum networks is to generate single photons with high brightness, purity, and long temporal coherence. Semiconductor quantum dots potentially satisfy these requirements; however, due to imperfections in the surrounding material, the coherence generally degrades with increasing excitation power yielding a broader emission spectrum. ...
Auteur: Morán-Meza, José A., Cousty, Jacques, Lubin, Christophe, Thoyer, François
Résumé: Epitaxial graphene (EG) grown on an annealed 6H-SiC(0001) surface has been studied under ultra-high vacuum (UHV) conditions by using a combined dynamic-scanning tunneling microscope/frequency modulation-atomic force microscope (dynamic-STM/FM-AFM) platform based on a qPlus probe. STM and AFM images independently recorded present the same hexagonal lattice of bumps with a 1.9 ...
Auteur: Tiron, Vasile, Velicu, Ioana-Laura, Stanescu, Dana, Magnan, Helene, Sirghi, Lucel
Résumé: Reactive High Power Impulse Magnetron Sputtering (HiPIMS) of a pure Zn target in Ar/N$_2$/O$_2$ gas mixture was used to synthesize ZnO$_x$N$_y$ thin films with nitrogen content and optical band-gap energy values ranging over 0–6.2 at.% and 3.34–1.67 eV, respectively. The fine control of the nitrogen content in the deposited ZnO$_x$N$_y$ ...
Auteur: Demeter, Alexandra, Samoila, Florentina, Tiron, Vasile, Stanescu, Dana, Magnan, Helene, Straticiuc, Mihai, Burducea, Ion, Sirghi, Lucel
Résumé: Reactive High Power Impulse Magnetron Sputtering operated in multi-pulse mode (m-HiPIMS) of a pure Ti target in Ar/N$_2$/O$_2$ gas mixture (mass flow rates of 50, 2 and 0.16 sccm, respectively) has been used for the deposi-tion of titanium oxynitride (TiO$_x$N$_y$) thin films with variable content of nitrogen (from 0.6 at.% ...
Auteur: Nikolayev, Vadim S., Garrabos, Yves, Lecoutre, Carole, Pichavant, Guillaume, Chatain, Denis, Beysens, Daniel
Résumé: Thermocapillary (Marangoni) motion of a gas bubble (or a liquid drop) under a temperature gradient can hardly be present in a one-component fluid. Indeed, in such a pure system, the vapor–liquid interface is always isothermal (at saturation temperature). However, evaporation on the hot side and condensation on the cold side ...