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Séminaires Invités

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Séminaires donnés par des invités extérieurs au LIPhy.

Ce sont des séminaires généraux qui s’adressent à tous les membres du LIPhy. Par conséquent, l’introduction, la plus large possible, y joue un rôle important.

Les séminaires durent environ 1heure dont 15mn accordées aux questions. Ils ont lieu les lundis à 14h, en salle de conférence du laboratoire au deuxième étage. La langue des séminaires est en général l’anglais.

L’accès au laboratoire peut-être obtenu en contactant le secrétariat Nadine D’Andréa ou Chantal Reignier par l’intercom à l’entrée principale.


  • Lundi 13 décembre 14:00-15:30 - Adrien Bussonnière - MSC. Univ. Paris / CNRS

    Local origin of the viscoelasticity of liquid foam

    Résumé : Liquid foam mainly consists of air bubbles separated by soap-stabilized thin liquid films. This light and fragile material is surprisingly extremely dissipative, its effective viscosity can be as high as thousands of times the water viscosity. Localization of the velocity gradient in the thin liquid films, resulting in important viscous dissipation, has been invoked to rationalized this dissipation enhancement. Nonetheless, the local stresses driving and controlling the liquid phase flow remains an open question. In this talk, we reveal the local origin of the strain confinement in the films and provide a dissipative mechanism, at the scale of few bubbles.
    When deformed, we show that the largest part of the foam films surprisingly behaves as a pure reversible elastic. Their stored elastic energy is then released by exchanging interface with the neighbor films. However, the film junctions, where 3 films meet, cannot accommodate a uniform velocity on each of its interfaces. This geometrical frustration gives rise to a shear flow in a small domain of the film, close to the junction, and is at the origin of the enhanced dissipation. The size of these sheared regions, and the induced dissipation, are modelled, and are shown to be controlled by the soap molecule diffusivity and solubility. Our results provide the missing link between the solution physico-chemical properties and the apparent viscosity. We foresee that established local laws will allow to unravel foam rheology.
    Contact : Benjamin Dollet

  • Jeudi 13 janvier 2022 14:00-15:30 - Michele Migliore - Institute of Biophysics, National Research Council, Palermo

    Cognitive functions (and dysfunctions) emerging from large-scale data-driven models of brain regions

    Résumé : Understanding the neural basis of brain functions and dysfunctions has a huge impact on a number of scientific, technical, and social fields. Experimental findings have given and continue to give important clues at different levels, from subcellular biochemical pathways to behaviors. However, most of the multi-level mechanisms underlying the cognitive architecture of the involved brain regions are still largely unknown or poorly understood. This mainly depends on the practical impossibility to obtain detailed simultaneous in vivo recordings from an appropriate set of cells, making it nearly impossible to decipher and understand the emergent properties and behavior of large neuronal networks. We are addressing this problem using large-scale computational models of biologically inspired cognitive architectures. I will present and discuss the main results and techniques we use to design and exploit full-scale models of neurons and networks implemented following their natural 3D structure, with the main aim to uncover the mechanisms underlying higher brain functions and helping the development of innovative therapies to treat brain diseases.
    Contact : Laila Blömer

  • Lundi 24 janvier 2022 14:00-15:30 - Marie-Jean Thoraval - King Abdullah University of Science and Technology

    Séminaire LIPhy

    Résumé : ==========
    Contact : Philippe Marmottant

  • Lundi 31 janvier 2022 14:00-15:30 - Isabelle Beurroies - MADIREL, Aix-Marseille Université

    Séminaire LIPhy

    Résumé : Contact : Cyril Picard

  • Lundi 7 février 2022 14:00-15:30 - Uwe Thiele - Institut für Theoretische Physik, Universität Münster

    Séminaire LIPhy

    Résumé : Contact : Karin John

  • Jeudi 24 mars 2022 14:00-15:30 - Gerald Kneller - Centre de Biophysique Moléculaire, CNRS

    Séminaire LIPhy

  • Lundi 28 mars 2022 14:00-15:30 - Ramiro Gaudoy-Diana et Benjamin Thiria - PMMH, ESPCI

    Séminaire LIPhy

    Résumé : Contact : Aurélie Dupont / Philippe Peyla

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