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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.

Agenda

  • Lundi 29 mai 14:00-15:30 - Maria Consiglia Merola - Stanford University, USA

    Viscoelastic properties of corneal epithelial cells using the “Linear Cell Monolayer Rheometer”

    Résumé : Mechanical properties of cells are determined by complex intracellular structures. In other words, there is a strong connection between biological processes and cellular mechanical response to external stimuli. In fact, cells’ interactions with their living environment are affected by their own mechanical behavior during biological deformations. These interactions, notably adhesion, are crucial to understand the cells adaptation in presence of artificial material such as contact lenses or medical devices.
    During the last decades, different experimental techniques have been used to investigate cell mechanics. Among them, we can mention atomic force microscopy (AFM) and microrheology. While they present a great interest, these techniques are however limited since they can only probe a single cell. In order to overcome the challenges with the biological variation between individual cells, new technologies are thus necessary.
    In this work, we present measurements using a purpose made Linear Cell Monolayer Rheometer (LCMR) that can characterize averaged cell mechanics or averaged cell adhesion. The LCMR enables the investigation of biologically active layers : controlled amounts of live cells with or without artificial materials (e.g., contact lenses). It is used in this study to measure the mechanics of corneal epithelial cells in order to characterize how these cells mechanically deform to external stimuli.
    To simulate physiological conditions, cell mechanics is quantified in experiments in which cells are strained tangential to the cell monolayer. Time-dependent step-strain tests are used to determine the mechanical relaxation of the cell layers.
    The quantification of cell mechanics using the LCMR has the potential for multiple biomedical applications, including disease diagnosis and drug-efficacy screening.



    contact : Claude Verdier

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Jeudi 1er juin 14:00-15:30 - Silvio FRANZ - LPTMS, CNRS, Univ. Paris-Sud, Universite' Paris-Saclay, 91405 Orsay

    Mean-field avalanches in jammed spheres

    Résumé : Disordered systems are characterized by the existence of many sample-dependent local-energy minima that cause a step-wise response when the system is perturbed. In this talk I will illustrate an approach based on elementary probabilistic methods to compute the complete probability distribution of the jumps (static avalanches) in the response of mean-field systems described by replica symmetry breaking ; there is a precise condition for having a power-law behavior in the distribution of avalanches caused by small perturbations, our predictions are in remarkable agreement with simulations of three-dimensional systems of soft spheres, either at jamming or at slightly higher densities.
    Ref : SF and S. Spigler PHYSICAL REVIEW E 95, 022139 (2017)



    contact : Giacomo Gradenigo

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Mercredi 7 juin 14:00-15:30 - Stefanos Papanikolaou

    LIPHY Seminar

    Résumé :



    contact : Kirsten Martens

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 12 juin 14:00-15:30 - Kaare Jensen

    LIPHY Seminar

    Résumé :



    contact : Jean-François Louf

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 24 juillet 14:00-15:30 - Loïc Tadrist - Laboratoire de microfluidique, Université de Liège, Belgium

    Hydrodynamic Wave-Particle Coupling : Chaos Generated by Non-regular Bounces

    Résumé : Ten years ago, Y. Couder, was studying delayed coalescence of a drop on a vibrated bath. By serendipity he discovered a unique example of macroscopic wave-particle duality : the walkers.
    A droplet deposited on a vertically vibrated bath may, under some conditions, stay in a stable state for which the air layer that separates the drop from the bath is constantly renewed. The droplet never merges with the bath. Under even more restrictive conditions, the waves created by the consecutive impacts of the droplet on the bath interact with the droplet : the droplet is spontaneously propelled. The object compounded of the particle and the waves is called a walker. Scientific debate about the possible analogy between this system and quantum mechanics is still abundant and far from being closed.
    In this talk, I show that the bouncing phase of the droplet in regard to the driving vibration is a crucial parameter for multi-body interactions and chaos generation. At last, I will tell about very first results about the “wavy” potential that rules the interaction between walkers and I will try to show their quantum analog. 



    contact : Jean-François Louf

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 30 octobre 14:00-15:30 - Thomas Ihle - Germany

    LIPHY Seminar

    Résumé :



    contact : Chaouqi Misbah

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


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