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Seminars

Contact :
Matthieu Labousse
matthieu.labousse (arobase) espci.psl.eu
Tel : +33 (0) 1 40 79 45 97

Joshua McGraw
joshua.mcgraw (arobase) espci.fr
Tel : +33 (0) 1 40 79 59 62

Map

Gulliver seminars take place on Mondays at 11:30 AM in the F304 room, and typically last one hour including questions. The seminars are in English, and the scientific topics are mainly those studied in the laboratory.


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Séminaires  (520)

  • Jean-Christophe Géminard (Laboratoire de Physique, École Normale Supérieure de Lyon)
    Lundi 8 décembre 2014 11:15-12:15 - Bibliothèque PCT - F3.04
    Softening Induced Instability of a Stretched Cohesive Granular Layer
    First, we report on a cellular pattern which spontaneously forms at the surface of a thin layer of a cohesive granular material submitted to in-plane stretching. We then present a simple model in which the mechanism responsible for the instability is the ‘‘strain softening'' exhibited by humid granular materials (...)
  • Jean-Christophe Géminard (Laboratoire de Physique, École Normale Supérieure de Lyon)
    Lundi 8 décembre 2014 11:15-12:15 - Bibliothèque PCT - F3.04
    Softening Induced Instability of a Stretched Cohesive Granular Layer
    First, we report on a cellular pattern which spontaneously forms at the surface of a thin layer of a cohesive granular material submitted to in-plane stretching. We then present a simple model in which the mechanism responsible for the instability is the ‘‘strain softening'' exhibited by humid granular materials (...)
  • Vincent Démery (PCT, Gulliver, ESPCI)
    Lundi 5 janvier 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Droplets Like to Wear Thin Polygonal Dresses
    A flat sheet must deform to wrap a liquid drop. Thin sheets (∼ 100 nm) wrap using small-scale wrinkles and folds, unlike thick sheets, which only bend over large scales. These features cost little mechanical energy but give considerable freedom to deform without stretching. We demonstrate that the global wrapped (...)
  • Vincent Démery (PCT, Gulliver, ESPCI)
    Lundi 5 janvier 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Droplets Like to Wear Thin Polygonal Dresses
    A flat sheet must deform to wrap a liquid drop. Thin sheets (∼ 100 nm) wrap using small-scale wrinkles and folds, unlike thick sheets, which only bend over large scales. These features cost little mechanical energy but give considerable freedom to deform without stretching. We demonstrate that the global wrapped (...)
  • Mederic Argentina (INLN, Nice)
    Lundi 19 janvier 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Scaling Macroscopic Aquatic Locomotion
    Inertial aquatic swimmers that use undulatory gaits range in length L from a few millimetres to 30 metres, across a wide array of biological taxa. Using elementary hydrodynamic arguments, we uncover a unifying mechanistic principle characterizing their locomotion by deriving a scaling relation that links swimming (...)
  • Mederic Argentina (INLN, Nice)
    Lundi 19 janvier 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Scaling Macroscopic Aquatic Locomotion
    Inertial aquatic swimmers that use undulatory gaits range in length L from a few millimetres to 30 metres, across a wide array of biological taxa. Using elementary hydrodynamic arguments, we uncover a unifying mechanistic principle characterizing their locomotion by deriving a scaling relation that links swimming (...)
  • Anne-Dominique Cambou (EC2M, Gulliver, ESPCI)
    Lundi 26 janvier 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Geometry and Ordering in Crumpled Sheets
    Graphene membranes, cabbage leaves, and even the Himalayas are all examples of thin sheets : objects with a thickness much smaller than their length and width. Despite their differences in size and in material composition, similar patterns emerge when sheets are crumpled or forced into a small three-dimensional (...)
  • Anne-Dominique Cambou (EC2M, Gulliver, ESPCI)
    Lundi 26 janvier 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Geometry and Ordering in Crumpled Sheets
    Graphene membranes, cabbage leaves, and even the Himalayas are all examples of thin sheets : objects with a thickness much smaller than their length and width. Despite their differences in size and in material composition, similar patterns emerge when sheets are crumpled or forced into a small three-dimensional (...)
  • Christophe Poulard (LPS, Paris XI)
    Lundi 2 février 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Adhesion with a Cassie-Wenzel-like Transition for Textured Elastic Contacts
    When a smooth sphere of elastomer is pressed against a substrate micropatterned with a regular hexagonal array of pillars, a transition between a contact only established at the top of the pillars (Cassie-like state) and a mixed contact with a central zone of full contact (Wenzel-like state) surrounded by a top (...)
  • Christophe Poulard (LPS, Paris XI)
    Lundi 2 février 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Adhesion with a Cassie-Wenzel-like Transition for Textured Elastic Contacts
    When a smooth sphere of elastomer is pressed against a substrate micropatterned with a regular hexagonal array of pillars, a transition between a contact only established at the top of the pillars (Cassie-like state) and a mixed contact with a central zone of full contact (Wenzel-like state) surrounded by a top (...)
  • Olivier Pouliquen (IUSTI, Marseille)
    Lundi 9 février 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    How Plants Feel Gravity : a Granular Flow Problem ?
    A plant accidentally put in a horizontal position rapidly bends and deforms to recover a vertical position. The ability of plants to feel gravity thus plays a key role in their development and adaptation to environmental changes (gravitropism). A crucial step in this gravisensing occurs in specific cells, the (...)
  • Olivier Pouliquen (IUSTI, Marseille)
    Lundi 9 février 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    How Plants Feel Gravity : a Granular Flow Problem ?
    A plant accidentally put in a horizontal position rapidly bends and deforms to recover a vertical position. The ability of plants to feel gravity thus plays a key role in their development and adaptation to environmental changes (gravitropism). A crucial step in this gravisensing occurs in specific cells, the (...)
  • François Pétrélis (LPS, ENS)
    Lundi 16 février 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Large Scale Dynamics and 1/f Fluctuations in Turbulence
    In a turbulent flow, many length scales contain energy. It is known for a long time that how the energy depends on the length scale is independent of details of the flow forcing or dissipation. Less in known about the temporal evolution of the turbulent field, in particular for the largest scales. I present a (...)
  • François Pétrélis (LPS, ENS)
    Lundi 16 février 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Large Scale Dynamics and 1/f Fluctuations in Turbulence
    In a turbulent flow, many length scales contain energy. It is known for a long time that how the energy depends on the length scale is independent of details of the flow forcing or dissipation. Less in known about the temporal evolution of the turbulent field, in particular for the largest scales. I present a (...)
  • Jean-Christophe Baret (CRPP, Université de Bordeaux)
    Lundi 23 février 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Soft Interfaces in Microfluidics
    Droplet-based microfluidics offers new means to miniaturize and automatize biochemical assays. The technology opens up on many applications in biotechnology, for example for single cell screening or molecular diagnostics. As the technology relies on emulsion manipulation in microchannels, it is crucial to (...)
  • Jean-Christophe Baret (CRPP, Université de Bordeaux)
    Lundi 23 février 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Soft Interfaces in Microfluidics
    Droplet-based microfluidics offers new means to miniaturize and automatize biochemical assays. The technology opens up on many applications in biotechnology, for example for single cell screening or molecular diagnostics. As the technology relies on emulsion manipulation in microchannels, it is crucial to (...)
  • David Gonzalez-Rodriguez (LadHyX, Polytechnique)
    Lundi 2 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Cellular Morphodynamics : Shivering of Cellular Aggregates and Elasto-Capillary Instability of Mitochondria
    In this talk I will present two problems in cell mechanics where insight is gained through physical modeling and analogies to inert systems. First I will discuss our work on cellular aggregates, a simple laboratory model of tissues and tumors. We have studied the behavior of cellular aggregates under stretching (...)
  • David Gonzalez-Rodriguez (LadHyX, Polytechnique)
    Lundi 2 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Cellular Morphodynamics : Shivering of Cellular Aggregates and Elasto-Capillary Instability of Mitochondria
    In this talk I will present two problems in cell mechanics where insight is gained through physical modeling and analogies to inert systems. First I will discuss our work on cellular aggregates, a simple laboratory model of tissues and tumors. We have studied the behavior of cellular aggregates under stretching (...)
  • Germain Rousseaux (Institut P', Poitiers)
    Lundi 9 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    The Naval Battle of Actium and the Myth of the Ship-Holder
    "The small Echeneis is present, wonderful to say, a great hindrance to ships." (Ovid, Halieutica)
  • Germain Rousseaux (Institut P', Poitiers)
    Lundi 9 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    The Naval Battle of Actium and the Myth of the Ship-Holder
    "The small Echeneis is present, wonderful to say, a great hindrance to ships." (Ovid, Halieutica)
  • Basile Audoly (Institut d'Alembert, Paris VI)
    Lundi 16 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Inextensible Elastic Ribbons : Models and Stability
    We consider the deformation of elastic ribbons, i.e. solids whose thickness is much smaller than the width, and whose width is much smaller than the length. A ribbon can typically be obtained by cutting out a strip in a piece of paper. From a mechanical perspective, the ribbon lies halfway between a (...)
  • Basile Audoly (Institut d'Alembert, Paris VI)
    Lundi 16 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Inextensible Elastic Ribbons : Models and Stability
    We consider the deformation of elastic ribbons, i.e. solids whose thickness is much smaller than the width, and whose width is much smaller than the length. A ribbon can typically be obtained by cutting out a strip in a piece of paper. From a mechanical perspective, the ribbon lies halfway between a (...)
  • Massimiliano Esposito (Joliot Chair & University of Luxembourg)
    Lundi 23 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Nonequilibrium Thermodynamics of Closed and Open Chemical Networks
    I will present a systematic procedure to study the thermodynamics of chemical networks made of coupled elementary reactions satisfying mass action law. Convergence to equilibrium is proved in closed networks. In open networks (i.e. networks where concentrations of some of the species called chemostats are hold (...)
  • Massimiliano Esposito (Joliot Chair & University of Luxembourg)
    Lundi 23 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Nonequilibrium Thermodynamics of Closed and Open Chemical Networks
    I will present a systematic procedure to study the thermodynamics of chemical networks made of coupled elementary reactions satisfying mass action law. Convergence to equilibrium is proved in closed networks. In open networks (i.e. networks where concentrations of some of the species called chemostats are hold (...)
  • Fabian Brau (ULB, Belgium)
    Lundi 30 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Morphogenesis, Self-Organization and Fracture in Elastic Thin Sheets
    When a curtain is suspended, a periodic deformation, having a given mean wavelength, is usually applied at one of its edges. This deformation relaxes along the curtain producing a cascade of folds characterized by an increase of the mean wavelength. We will show that this pattern can be understood as a (...)
  • Fabian Brau (ULB, Belgium)
    Lundi 30 mars 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Morphogenesis, Self-Organization and Fracture in Elastic Thin Sheets
    When a curtain is suspended, a periodic deformation, having a given mean wavelength, is usually applied at one of its edges. This deformation relaxes along the curtain producing a cascade of folds characterized by an increase of the mean wavelength. We will show that this pattern can be understood as a (...)
  • Andrew Griffiths (LBC, ESPCI)
    Lundi 13 avril 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Droplet-based Microfluidics for Ultra-High-Throughput Digital Biology
    Programmable microfluidic modules have been created which can precisely make, combine, split, mix, incubate, detect fluorescence and sort microscopic droplets. Integration of multiple modules onto a single microfluidics chip enables a vast number of assays (> 105 / min) to be performed using extremely low volumes (...)
  • Andrew Griffiths (LBC, ESPCI)
    Lundi 13 avril 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Droplet-based Microfluidics for Ultra-High-Throughput Digital Biology
    Programmable microfluidic modules have been created which can precisely make, combine, split, mix, incubate, detect fluorescence and sort microscopic droplets. Integration of multiple modules onto a single microfluidics chip enables a vast number of assays (> 105 / min) to be performed using extremely low volumes (...)
  • Martin Lenz (LPTMS, Université Paris-Sud)
    Lundi 20 avril 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Disordered Actomyosin Contracts in Unexpected Ways
    The motion of living cells is in large part due to the interaction of semi-flexible actin filaments (F-actin) and myosin molecular motors, which induce the relative sliding of F-actin. It is often assumed that this simple sliding is sufficient to account for all actomyosin-based motion. While this is correct (...)
  • Martin Lenz (LPTMS, Université Paris-Sud)
    Lundi 20 avril 2015 11:15-12:15 - Bibliothèque PCT - F3.04
    Disordered Actomyosin Contracts in Unexpected Ways
    The motion of living cells is in large part due to the interaction of semi-flexible actin filaments (F-actin) and myosin molecular motors, which induce the relative sliding of F-actin. It is often assumed that this simple sliding is sufficient to account for all actomyosin-based motion. While this is correct (...)

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General recommendations for the speakers

The audience is often heterogeneous - because of the wide range of scientific topics covered in the lab - so planning a talk for a broader audience would be preferred. The seminar is in English, and speakers are thus invited to prepare their slides in English.

The seminar starts at 11:30 AM. The speaker is asked to arrive in the lab at least 15 minutes in advance to set up their computer. The talks last typically 45 minutes, and are followed by a discussion time.

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