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Il faut donc trouver un équilibre critique entre famille, État et monde, que l'école a charge de construire. 10 R-F Gauthier conclut en ouvrant sur la décennie à venir. ... R-F Gauthier, attentif aux évolutions les plus récentes, appelle de ses voeux un débat public, démocratique, sur ceCe que l'école devrait enseigner. Pour une révolution de la politique scolair... ...doi:10.4000/ries.4099 fatcat:em3dh676arbszlus6mc7sxfhxu
Gauthier participated equally to this work. only CD4 / T cells but also other immune cells. ...doi:10.1006/viro.1997.8512 pmid:9143314 fatcat:upmdbxjlwzhcbfvolr73vngb5e
An original spectral study of the compressible hybrid lattice Boltzmann method (HLBM) on standard lattice is proposed. In this framework, the mass and momentum equations are addressed using the lattice Boltzmann method (LBM), while finite difference (FD) schemes solve an energy equation. Both systems are coupled with each other thanks to an ideal gas equation of state. This work aims at answering some questions regarding the numerical stability of such models, which strongly depends on thearXiv:2006.08477v1 fatcat:wnrmq25gg5edbbtnmv4mfgqiei
more »... e of numerical parameters. To this extent, several one- and two-dimensional HLBM classes based on different energy variables, formulation (primitive or conservative), collision terms and numerical schemes are scrutinized. Once appropriate corrective terms introduced, it is shown that all continuous HLBM classes recover the Navier-Stokes Fourier behavior in the linear approximation. However, striking differences arise between HLBM classes when their discrete counterparts are analysed. Multiple instability mechanisms arising at relatively high Mach number are pointed out and two exhaustive stabilization strategies are introduced: (1) decreasing the time step by changing the reference temperature T_ref and (2) introducing a controllable numerical dissipation σ via the collision operator. A complete parametric study reveals that only HLBM classes based on the primitive and conservative entropy equations are found usable for compressible applications. Finally, an innovative study of the macroscopic modal composition of the entropy classes is conducted. Through this study, two original phenomena, referred to as shear-to-entropy and entropy-to-shear transfers, are highlighted and confirmed on standard two-dimensional test cases.
Pierre-Louis Gauthier NOTE DE L'AUTEUR Ouvrage disponible librement en ligne sur : http://unesdoc.unesco.org/ images/0014/001475/147570f.pdf ; version anglaise en ligne et papier disponible en mars 2007 ... RÉFÉRENCE Roger-François Gauthier, Les contenus de l'enseignement secondaire dans le monde : états des lieux et choix stratégiques,UNESCO Edit., 2006, 139 p. ...doi:10.4000/ries.108 fatcat:4rhiwfpqg5ffvln5lwn5tb4dyu
IFIP Advances in Information and Communication Technology
Unification of multiple models for complex system development Nesrine BEN BELDI (1, 2) , Lionel ROUCOULES (1) , François MALBURET (1) , Tomasz KRYSINSKI (2) , Pierre GAUTHIER (2) 1 Introduction ...doi:10.1007/978-3-662-45937-9_27 fatcat:yonohm23bncm7m6plubbz4pmqm
The present study proposes a highly accurate lattice Boltzmann direct coupling cell-vertex algorithm, well suited for industrial purposes, making it highly valuable for aeroacoustic applications. It is indeed known that the convection of vortical structures across a grid refinement interface, where cell size is abruptly doubled, is likely to generate spurious noise that may corrupt the solution over the whole computational domain. This issue becomes critical in the case of aeroacousticarXiv:2004.14887v1 fatcat:yas6bcnfonc6tndvylhz5ewjze
more »... ns, where accurate pressure estimations are of paramount importance. Consequently, any interfering noise that may pollute the acoustic predictions must be reduced. The proposed grid refinement algorithm differs from conventionally used ones, in which an overlapping mesh layer is considered. Instead, it provides a direct connection allowing a tighter link between fine and coarse grids, especially with the use of a coherent equilibrium function shared by both grids. Moreover, the direct coupling makes the algorithm more local and prevents the duplication of points, which might be detrimental for massive parallelization. This work follows our first study (Astoul et al. 2020) on the deleterious effect of non-hydrodynamic modes crossing mesh transitions, which can be addressed using an appropriate collision model. The Hybrid Recursive Regularized model is then used for this study. The grid coupling algorithm is assessed and compared to a widely-used cell-vertex algorithm on an acoustic pulse test case, a convected vortex and a turbulent circular cylinder wake flow at high Reynolds number.
In this letter, we demonstrate that buried oxide-confined waveguides can be formed using a lateral oxidation process carried out through a discrete set of small-diameter via holes instead of the conventional scheme where the oxidation starts from the edges of etched mesas. The via-hole oxidation is shown to lead to straight waveguides with smooth oxide/semiconductor interfaces and whose propagation losses are similar to the one obtained using the standard process but with the advantage ofdoi:10.1364/oe.25.019275 pmid:29041120 fatcat:qwum4b3e7ze6bpikfnfa6lawhy
more »... ining a quasi-planar wafer surface. It thereby paves the way towards a simplification of the fabrication of III-Vsemiconductor-oxide photonic devices.
We present a detailed petrographic study of Pele's hairs and tears sampled from Masaya volcano (Nicaragua). This study provides new observations of these little-known pyroclastic objects using both secondary electron images (SEI) and back scattering electron images (BSEI). Our work shows that Pele's tears can be associated with Pele's hairs after their formation: tears can be trapped on the walls and/or in the cavities of Pele's hairs. Moreover, chemical investigations of the Pele's hairs anddoi:10.1016/j.jvolgeores.2007.05.007 fatcat:7zthxx55k5fe7gnkts2jetfxl4
more »... ars highlight the presence of a chemical zonation. The edge of these tears and hairs show a siliceous enrichment, allowing us to quantify the interaction time of the silicate glass with acid gases in the volcanic plume. This study confirms the syneruptive and post eruptive volatile exsolution from Pele's hairs and tears.
Gauthier-Lafaye I confinement in the disk whilst the lower is essentially there to set the lateral confinement of the access waveguide. ... Gauthier-Lafaye are with CNRS, LAAS, 7 avenue du colonel Roche, F-31400 Toulouse, France and with Univ de Toulouse, UPS, LAAS, F-31400 Toulouse, France (e-mail: firstname.lastname@example.org) A. ...doi:10.1109/lpt.2015.2405031 fatcat:acl4mhhixndxlle5o4wbm7seze
We acknowledge Olivier Etienne and Michelle Ricoul for technical help and Thierry Kortulewski, Lamya Irbah and Francoise Hoffschir for use of the iRCM imaging facility. ...doi:10.18632/oncotarget.26616 fatcat:bhjko4kw6fa6nhr3bfge6uvn6y
. & Gauthier, I. (2012) . Inventaire quinquennal 2010 du faucon pèlerin au Québec méridional : état de la population québécoise. ... (Gauthier et collab., 2007) . L'aire d'étude fut restreinte au Québec méridional, soit la portion située au sud du 49 e parallèle. ...doi:10.7202/1009245ar fatcat:4qeu7mdnhref3i4xerqulujovu
The artistic concept and challenges It is the first time that the artist (JP Gauthier) engaged in a high-tech project with robotic arms for which he cooperates with engineers that help him realize this ...doi:10.1145/3371382.3378310 dblp:conf/hri/KaufmannZRGBS20 fatcat:32iiiy23onfubmqgoh7difigsa
Lecture Notes in Computer Science
Morphometric analysis of brain structures is of high interest for premature neonates, in particular for defining predictive neurodevelopment biomarkers. This requires beforehand, the correct segmentation of structures of interest from MR images. Such segmentation is however complex, due to the resolution and properties of data. In this context, we investigate the potential of hierarchical image models, and more precisely the binary partition tree, as a way of developing efficient, interactivedoi:10.1007/978-3-030-20867-7_37 fatcat:vhrwiqgdpza3fpwngdlhxb5kla
more »... d user-friendly 3D segmentation methods. In particular, we experiment the relevance of texture features for defining the hierarchy of partitions constituting the final segmentation space. This is one of the first uses of binary partition trees for 3D segmentation of medical images. Experiments are carried out on 19 MR images for cerebellum segmentation purpose.
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