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Importance of infragravity waves for the generation of washover deposits
No full textInternational audienc
De l’usage politique du peuple Padano. La construction d’identité par la Ligue du Nord
No full textNational audienceEn Italie, le « peuple » de la Lega Nord (Ligue du Nord) s’est adossé originellement au façonnage d’une identité « padane » sans réel substrat culturel ou géographique. Au fil du temps, de nouvelles frontières sociales et symboliques ont été dessinées, complétées plus récemment par un repositionnement au cœur de l’espace des droites radicales populistes en Europe. Cette complexité tient en partie à la nature opportuniste et caméléonienne du régional-populisme « léguiste », et au statut hybride du mouvement, entre force de coalition gouvernementale et parti d’opposition. Elle illustre en outre la variabilité des structures d’opportunités politiques qui existent au nord et au sud de l’Italie
Viscous stabilizations for high order approximations of Saint-Venant and Boussinesq flows
No full textInternational audienceTwo viscous stabilization methods, namely the spectral vanishing viscosity (SVV) technique and the entropy viscosity method (EVM), are applied to flows of interest in geophysics. First, following a study restricted to one space dimension, the spectral element approximation of the shallow water equations is stabilized using the EVM. Our recent advances are here carefully described. Second, the SVV technique is used for the large-eddy simulation of the spatial and temporal development of the turbulent wake of a sphere in a stratified fluid. We conclude with a parallel between these two stabilization techniques
Multiactive objects and their applications
No full textInternational audienceIn order to tackle the development of concurrent and distributed systems, the active object programming model provides a high-level abstraction to program concurrent behaviours. There exists already a variety of active object frameworks targeted at a large range of application domains: modelling, verification, efficient execution. However, among these frameworks, very few consider a multi-threaded execution of active objects. Introducing controlled parallelism within active objects enables overcoming some of their limitations. In this paper, we present a complete framework around the multi-active object programming model. We present it through ProActive, the Java library that offers multi-active objects, and through MultiASP, the programming language that allows the formalisation of our developments. We then show how to compile an active object language with cooperative multi-threading into multi-active objects. This paper also presents different use cases and the development support to illustrate the practical usability of our language. Formalisation of our work provides the programmer with guarantees on the behaviour of the multi-active object programming model and of the compiler
La communication environnementale et climatique, entre objectifs de réputation et d'information.
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Normes linguistiques et terminologiques : conflits d’usages. Présentation
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AnaEE France - L'apport de l'expérimentation à l'étude de la biodiversité
No full textAnaEE France - L'apport de l'expérimentation à l'étude de la biodiversité. Séminaire Ecoscope : Données et évaluation de la biodiversité. Quels enjeux, quels défis
Electron-scale reduced fluid models with gyroviscous effects
No full textInternational audienceReduced fluid models for collisionless plasmas, including electron inertia and finite Larmor radius corrections, are derived for scales ranging from the ion to the electron gyroradii. Based either on pressure balance or on the incompressibility of the electron fluid, they respectively capture kinetic Alfvén waves (KAWs) or whistler waves (WWs), and can provide suitable tools for both reconnection and turbulence. Isothermal and Landau-fluid closures are considered. For small β e , a perturbative computation of the gyroviscous force valid at the electron inertial length is performed at order O(β e), which requires second-order contributions in a scale expansion. Anisotropy of pressure fluctuations enter the model equations in this regime. Comparisons with kinetic theory are performed in the linear regime, with special attention paid to the influence of Landau damping. The spectrum of transverse magnetic fluctuations in either strong or weak turbulence energy cascades is also phenomenologically predicted for both types of waves. New regimes, possibly related to the steep spectra observed in space plasmas in the sub-electron range, are obtained for KAWs at scales smaller than the electron inertial length, characterized by magnetic energy spectra decaying faster than those of WWs
Convection and Radiation During Melting of a Phase Change Material: A Simplified Model for Engineering Applications
No full textInternational audienceA simplified model for combined natural convection and radiation during melting process of a phase change material (PCM) is presented. First, the simplified model for natural convection during melting is validated using a CFD model, in addition to experimental and numerical benchmark solutions for a test case. Then, the simplified model for both natural convection and radiation is applied to the melting of a fatty acid eutectic filled in glass bricks and validated against lattice Boltzmann-discrete ordinate method (LBM-DOM). Finally, the complete model is applied to study the thermal behavior of a translucent wall; then validated experimentally using a full-scale building located in southern France