# Seminars

PMMH’s weekly seminar is held every Friday at 11 am (map)

Contact :
Benoit Semin
Sylvain Patinet
Etienne Reyssat

PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France

Tel : (33) 1 40 79 45 22

#### Séminaire PMMH - Priya Subramanian (Univ. of Leeds)

Vendredi 12 avril 2019 11:00-12:00 - Salle réunion PMMH 1

## Modal Interactions and Superlattice Patterns

Pattern formation in systems in many real world systems such as neural-field models, reaction-diffusion systems and fluid systems such as the Faraday wave system have separation of scales leading to nonlinear modal interactions. A general analysis of possible terms that can arise via modal interactions is subject to both the choice of a lattice grid and the ratio between the two length scales $q$. Motivated by the observance of different grid states and superlattice states in experiments of the Faraday wave system, here we consider a hexagonal lattice grid and identify families of amplitude equations for different values of the ratio in the range $02$. We find that the ratio of $q=1/\sqrt7$ gives rise to the maximum number of terms in the amplitude equations (up to third order terms) and that other families of amplitude equations can be recovered by setting the coefficients of certain modal interactions in this `general' form to vanish. For the case with $q=1/\sqrt7$, we use homotopy methods to investigate the existence and stability of multiple co-existing superlattice patterns over a range of growth rates for both the length scales. By varying the relative strengths of the different quadratic interactions, we explore the effect of different types of quadratic modal interactions in making superlattice patterns the globally stable state, i.e. observations in experiments.

## Seminar archive  (105)

• ### 2022

• Séminaire PMMH - Bruno Moulia (INRAE)
Vendredi 20 mai 11:00-12:00 - Salle réunion PMMH 1
The dimensionless numbers of the shaping of plant axes and crowns through tropism and elasticity : a physicist approach of the biological regulation of plant morphogenesis.
The shape of plant stems and/or of the whole crown of isolated trees are conspicuous traits of each species, while at the same time-varying a lot depending on the environment in which the plant grew. A major process involved in this shaping is stem tropism, i.e. oriented growth directed by external clues. In plant (...)
• Séminaire PMMH - Olivier Devauchelle (IPGP, Paris)
Vendredi 13 mai 11:00-12:00 - Salle réunion PMMH 1
Swimming in a wave field
When a bath of silicon oil vibrates vertically, a droplet of the same oil can bounce indefinitely on its surface [1]. As it does so, it generates a Faraday wave around itself, which then pushes the droplet across the surface. Guided by this wave, the droplet interacts with its own trajectory, with the boundaries, (...)
• Séminaire PMMH - Alexandre Nicolas (U. Lyon 1)
Vendredi 22 avril 11:00-12:00 - Salle réunion PMMH 1
Physical modelling of pedestrian dynamics : Make your way through the crowd !
Physics has constantly been pushing back its boundaries, so much so that active systems of biological interest have come under its scrutiny in the past decades. At present, among its outermost interfaces, research into the dynamics of pedestrian crowds aspires to provide physical insight into issues of major (...)
• Séminaire PMMH - Jens Eggers, U. of Bristol, UK
Vendredi 15 avril 11:00-12:00 - Salle réunion PMMH 1
Theory of bubble tips in strong viscous flows
A free surface, placed in a strong viscous flow (such that viscous forces overwhelm surface tension), often develops ends with very sharp tips. For example, observe a bubble in a shampoo bottle, turned upside down. We shown that the axisymmetric shape of the ends, non-dimensionalized by the tip curvature,is (...)
• Séminaire PMMH - Luca Cipelletti (Univ. Montpellier)
Vendredi 8 avril 11:00-12:00 - Salle réunion PMMH 1
• Séminaire PMMH - Stefan Catheline (INSERM, Univ. Lyon1)
Vendredi 1er avril 11:00-12:00 - Salle réunion PMMH 1
Wave elastography applied to soft tissues and membrane
Elastography, sometimes referred as seismology of the human body, is an imaging modality now implemented on medical ultrasound systems, on MRI and recently in optical coherence tomography devices. It allows to measure shear wave speeds within soft tissues and gives a tomography reconstruction of the shear (...)
• Séminaire PMMH : Raphaël Jeanneret, LPENS
Vendredi 25 mars 11:00-12:00 - Salle réunion PMMH 1
• Séminaire PMMH - Arnaud Lazarus (Institut d'Alembert, Sorbonne Université)
Vendredi 18 mars 11:00-12:00 - Salle réunion PMMH 1
New insights on the dynamic stability of time-periodic systems
Periodically time-varying systems are a class of mathematical problems that underlie many important phenomena and applications in physics, such as parametric instabilities, acoustic tweezers, mass spectrometers and Paul traps or any Floquet engineered systems in Quantum Mechanics. Eventually, the mechanics (...)
• Séminaire PMMH : Valentin Leroy, MSC, Université de Paris
Vendredi 11 mars 11:00-12:00 - Salle réunion PMMH 1
• Séminaire PMMH, Marianne Grognot (LBE - ESPCI)
Vendredi 11 février 11:00-12:00 - Salle réunion PMMH 1
A multiscale chemotaxis assay to unravel how motile bacteria navigate their environment(s)
Flagellated bacteria swim by rotating one or several flagella ; motility alone results in a random walk, but the flagella's rotation can be influenced by an intracellular sensory system that enables cells to climb or descend chemical gradients, in a process called chemotaxis. Altogether, motility and chemotaxis (...)
• Séminaire PMMH Jasna Brujic
Vendredi 4 février 11:00-12:00 - Salle réunion PMMH 1
• Séminaire PMMH - Julian Talbot (LPTMC, Sorbonne Univ.)
Vendredi 21 janvier 11:00-12:00 - Salle réunion PMMH 1
Statistics and Optimisation of Random Pan Stacking
The stacking of objects is a familiar operation. For example, a common conundrum of daily life is how to arrange a collection of pots and pans so that the stack will fit in a kitchen cupboard. Because of the varying form and convex nature of the pans, the height will vary depending on the order in which they are (...)
• ### 2021

• Séminaire PMMH - Varda Hagh (Univ. of Chicago)
Vendredi 10 décembre 2021 11:00-12:00 - Salle réunion PMMH 1
Free-then-freeze : transient learning degrees of freedom for introducing function in materials
Many protocols used in material design and training have a common theme : they introduce new “learning'' degrees of freedom, often by relaxing away existing constraints, and then evolve these degrees of freedom based on a rule that leads the material to a desired state at which point these learning degrees of (...)
• Séminaire PMMH - Edouard Ravier (Université du Mans)
Vendredi 3 décembre 2021 11:00-12:00 - Salle réunion PMMH 1
What can we learn from the experimental modelling of subglacial hydrology ?
The configuration and evolution of the hydrological system under ice sheets is a key control on ice flow dynamics, erosion, sedimentation and bed deformation. Due to the inaccessibility of the subglacial environment, the understanding of subglacial meltwater drainage and its interaction with the ice and the (...)
• Séminaire PMMH - Tom Witten (University of Chicago)
Vendredi 26 novembre 2021 11:00-12:00 - Salle réunion PMMH 1
Latent sculpture in a curved crease
Thin sheets have an inherent tendency to shape themselves. When forced, they seek to deform in a way that bends without stretching. Thus a crushed sheet shapes itself into a crumpled shape made of flat facets bounded by sharp edges. These sharp features fail to avoid stretching : the deformation energy of (...)
• Séminaire PMMH David Richard (Liphy, Grenoble)
Vendredi 12 novembre 2021 11:00-12:00 - Salle réunion PMMH 1
Using soft excitations to predict and understand plastic flow in disordered solids
Imposing an external driving, amorphous solids can flow via a succession of plastic rearrangement of localized particles. Numerous numerical and experimental studies have shown that loci of plastic instability in glasses are triggered by spatially localized soft spots in direct analogy with dislocations present in (...)
• Séminaire PMMH Rémi Carminati (Institut Langevin, ESPCI)
Vendredi 22 octobre 2021 11:00-12:00 - Salle réunion PMMH 1
Seeing through disordered scattering materials
The propagation of coherent light through a scattering medium produces speckle patterns in reflection and transmission. Despite the apparent randomness of the speckle patterns, a statistical correlation between the reflected and transmitted intensities survives even in the multiple scattering regime. This mutual (...)
• Séminaire PMMH - Marco Faustini (LCMCP, Sorbonne Univ.)
Vendredi 15 octobre 2021 11:00-12:00 - Salle réunion PMMH 1
Evaporation-driven processes towards photonic colloidal assemblies
Developing patterning methods to obtain periodic and ordered colloidal films could open perspectives for their utilization in fields ranging from electronics, photonics, microfluidics or dew-harvesting (1). For instance, integrating porous nanoparticles (oxides or Metal-Organic Frameworks) in periodic structures (...)
• Séminaire PMMH Elim Hong (IBPS, Sorbonne Université)
Vendredi 24 septembre 2021 11:00-12:00 - Salle réunion PMMH 1
The yin yang pathway in the aversive brain
The habenulo-interpeduncular (Hb-IPN) pathway is an evolutionarily conserved neural pathway mediating diverse pathophysiological behaviors including locomotion, fear, anxiety and nicotine addiction. The left and right habenular nuclei consists of hundreds of neurons that send long axons to project to its target, (...)
• Séminaire PMMH - Valentina Di Santo (Stockholm University)
Vendredi 10 septembre 2021 11:00-12:00 - Salle réunion PMMH 1
How fishes save energy : exploring biomechanical and physiological performance of locomotion
Swimming ability has contributed to the evolutionary success of fishes, and its mechanics have been studied extensively across groups. Fishes exhibit an astounding diversity of locomotor behaviors, from classic swimming with their body and fins to jumping, flying, walking, and collective behaviors such as (...)
• Séminaire PMMH - Hillel Aharoni (Weizmann Inst.)
Vendredi 3 septembre 2021 11:00-12:00 - Salle réunion PMMH 1
On wrinkles, and what they have to do with liquid crystals
A thin elastic sheet attached to a soft substrate often develops wrinkle patterns when subject to an external forcing or as a result of geometric incompatibility. Such patterns appear spontaneously in a variety of natural systems, ranging from plant tissues to drying paint and from milk skin to human skin. The (...)
• Séminaire PMMH Lucilla de Arcangelis (Univ. of Naples)
Vendredi 9 juillet 2021 11:00-12:00 - Salle réunion PMMH 1
Acoustic fluidization and remote earthquake triggering
Lucilla de Arcangelis, Eugenio Lippiello, Massimo Pica Ciamarra Engineering Department University of Campania “Luigi Vanvitelli” Occasionally, a major earthquake can trigger additional events at distances up to 1000 km away. How that happens is a longstanding puzzle since the amplitude of the seismic waves (...)
• Séminaire PMMH - Eva Adnan Kanso (Univ. of Southern California)
Vendredi 25 juin 2021 11:00-12:00 - Salle réunion PMMH 1
One Fish, Two Fish
I will tell two short stories of fish hydrodynamics. First, I will argue, based on biological observations and mathematical models, that fish that actively flap their tail in concert with passive hydrodynamic forces can simultaneously improve swimming speed and efficiency. Second, I will show that passive (...)
• Séminaire PMMH - Thomas Paehtz (Zhejiang University)
Vendredi 11 juin 2021 11:00-12:00 - Salle réunion PMMH 1
Unified model of sediment transport threshold and rate across subaqueous bedload, windblown sand, and windblown snow
Loose sedimentary grains cover much of the wind-blown (i.e., aeolian) and water-worked (i.e., fluvial) sedimentary surfaces of Earth and other planetary bodies. To predict how such surfaces evolve in response to aeolian and fluvial flows, one needs to understand the rate at which sediment is transported for given (...)
• Séminaire PMMH - Philippe Gondret (FAST, Univ. Paris-Saclay)
Vendredi 30 avril 2021 11:00-12:00 - Salle réunion PMMH 1
Tsunami generation by landslides : From laboratory experiments to geophysical events
Tsunami waves can arise from significant geological events such as the collapse of a mountain flank or a volcano into a lake or an ocean. We reproduce this situation at the laboratory scale. The landslide is modeled by the sudden release of a rectangular granular column, which then impacts a still water layer and (...)
• Séminaire PMMH - Jérôme Weiss (ISTerre, Grenoble)
Vendredi 19 mars 2021 11:00-12:00 - Salle réunion PMMH 1
Is mechanics driving the Arctic sea ice decline ?
In the Arctic, sea ice is undergoing for several decades a dramatic decline both in terms of spatial extent and average thickness. As sea ice strongly affects the exchanges of energy and momentum between the ocean and the atmosphere, its decline is accompanied by a particularly strong warming in the Arctic. The (...)
• Séminaire PMMH - Jérémy Hure (CEA Saclay)
Vendredi 5 mars 2021 11:00-12:00 - Salle réunion PMMH 1
Plasticity and ductile fracture in irradiated metals
Metals used in nuclear reactors core are subjected to neutron irradiation, leading to different kind of crystallographic defects depending on irradiation conditions. The main irradiation defects include dislocation loops and nano-voids. These defects have a strong influence on plasticity mechanisms, and, in turn, (...)
• Séminaire PMMH - Matilda Backholm (Aalto Univ., Helsinki, Finland)
Vendredi 12 février 2021 11:00-12:00 - Salle réunion PMMH 1
When honey moves faster than water
The viscosity of a fluid is well known to limit its flow : the more viscous a droplet, the slower it moves [1,2]. Here, we show that this intuitive rule breaks down in a confined liquid-repellent geometry. A gravity-driven, highly viscous glycerol droplet placed in a sealed superhydrophobic capillary moves more (...)
• Séminaire PMMH - Emmanuelle Rio (LPS-Univ. Paris Saclay)
Vendredi 5 février 2021 11:00-12:00 - Salle réunion PMMH 1
Rupture of Foam Films and Surface Bubbles
Surface bubbles are of crucial interest since they favours the transport of material from the bulk to the overlying atmosphere through the production of aerosols. This is important for example in climate models, air pollution studies or in the carbonated beverage industry since the produced aerosols contain most (...)
• Séminaire PMMH - Joe Tavacoli (München, Germany)
Vendredi 29 janvier 2021 11:00-12:00 - Salle réunion PMMH 1
Programmable design and performance of modular magnetic microswimmers
Synthetic microswimmers are promising agents for targeted in-vivo healthcare as well as important frameworks from which to advance the understanding of locomotion strategies at the microscopic scale.[1,2] Nevertheless, constructing these types of devices with flexibility of design and in large numbers remains a (...)
• Séminaire PMMH - Baptiste Darbois-Texier (FAST)
Vendredi 22 janvier 2021 11:00-12:00 - Salle réunion PMMH 1
Surface instability of shear-thickening suspensions down an inclined plane
A shear-thickening suspension, such as cornstarch particles in water, exhibits a very strange behavior : it flows as milk when gently stirred but turns rock solid under impact. Despite its notoriety, this phenomenon has been understood only recently. Based on this progress, we decided to explore the behavior of (...)
• ### 2020

• Séminaire PMMH - Lorraine Montel (UPMC)
Vendredi 11 décembre 2020 11:00-12:00 - Salle réunion PMMH 1
Emulsion droplets as a model biomimetic system
Emulsion droplets recapitulate the deformability and surface fluidity of biological objects, in a simpler and tunable fashion. Thus, they can be used as a model biomimetic system to study cell-cell interactions. During this talk, I will demonstrate this use in two different systems : the study of phagocytosis, and (...)
• Séminaire PMMH - A.M. Goryaeva (Université de Rouen)
Vendredi 27 novembre 2020 11:00-12:00 - Salle réunion PMMH 1
Reinforcing materials modelling by encoding the structures of defects in crystalline solids into distortion scores
A perfect crystal is a purely theoretical concept. Real-world crystals contain imperfections, also called defects. Identification and characterization of defects provide the crucial information for interpretation of simulations and experiments that bridge the gap between atomic- and micrometer-scales. But what is (...)
• Séminaire PMMH - Joseph d'Alessandro
Vendredi 13 novembre 2020 11:00-12:00 - Salle réunion PMMH 1

## Eukaryotic cells as interacting living particles

Cells move. They propel themselves using an internal machinery which endows them with the characteristics of active particles. At the same time, they interact dynamically with their (...)
Eukaryotic cells as interacting living particles
Cells move. They propel themselves using an internal machinery which endows them with the characteristics of active particles. At the same time, they interact dynamically with their environment and with neigbouring cells, by adhering, exerting forces and exchanging biochemical signals. In this talk, we will first (...)

• Séminaire PMMH - Costantino Creton (SIMM ESPCI)
Vendredi 6 novembre 2020 11:00-12:00 - Salle réunion PMMH 1
Using light to detect molecular forces, chemical bond scission and to understand fracture
Costantino Creton Soft Matter Science and Engineering, ESPCI Paris, Université PSL, Paris, F Recent advances in chemistry have made it possible to directly optically visualize forces on chemical bonds or even bond scission by using molecules that either emit light or become fluorescent when activated by the (...)
• Séminaire PMMH-Cécile Sykes (Institut Curie, Paris)
Vendredi 27 mars 2020 11:00-12:00 - Salle réunion PMMH 1
Active or passive deformation of the cell membrane supplied by actin assembly. Perpectives on nucleus deformation
In all cell functions, a common observation is that cytoskeleton assembly correlates with membrane deformation based on active forces. The exact role, in particular, of the actin cytoskeleton in cell membrane deformation, with pushing or pulling forces, is what we address both experimentally and theoretically. We (...)
• Séminaire PMMH - Chung-Yuen Hui (Cornell University)
Vendredi 13 mars 2020 11:00-12:00 - Salle réunion PMMH 1
Mechanical Properties of Fiber-Reinforced Soft Composites
In this talk I will focus on an emerging class of fiber reinforced composites where the matrix is extremely soft and tough. For example, an upper estimate for fiber/matrix modulus ratio in traditional fiber reinforced polymer composites is at most 100. Matrices made from tough elastic gels can have modulus (...)
• Séminaire PMMH, Arthur Lebée ENPC
Vendredi 6 mars 2020 11:00-12:00 - Salle réunion PMMH 1
Continuum elasticity of Miura Tessellations
Origami tessellations are curved two-dimensional discrete shells folded out of a periodic crease pattern. Unlike solid shells, Origami tessellations can morph and access a space of configurations each characterized by the list of folding angles of all creases. Due to inextensibility constraints imposed by Origami (...)
• Séminaire PMMH- Paulo E. Arratia (UPenn)
Vendredi 28 février 2020 11:00-12:00 - Salle réunion PMMH 1
A microstructural view of yielding and plasticity in 2D disordered materials
When stressed sufficiently, amorphous materials yield and deform plastically via reorganization of microscopic constituents. Despite much effort, understanding the interdependence of yielding, plasticity, and microscopic structure in non-equilibrium states (i.e. under stress) remains a major challenge. In this (...)
• Séminaire PMMH- Elisabeth Guazzelli (MSC)
Vendredi 7 février 2020 11:00-12:00 - Salle réunion PMMH 1
Particle motion in vortical flows
In many natural phenomena or industrial applications, heavy particles are transported in complex flows. The flow structures may happen to promote the stirring and dispersion of the particles. But the opposite can also take place and the flow configuration may contribute to the focussing and accumulation of (...)
• Séminaire PMMH- Dwight Barkley (University of Warwick)
Vendredi 31 janvier 2020 11:00-12:00 - Salle réunion PMMH 1
A fluid mechanic's analysis of the tea-cup singularity
In 1926 Einstein published a short paper explaining the meandering of rivers. He famously began the paper by discussing the secondary flow generated in a stirred tea cup — the flow now widely known to be responsible for the collection of tea leaves at the center of a stirred cup of tea. In 2014, Luo and Hou (...)
• Séminaire PMMH- Kristina Davitt (ENS)
Vendredi 24 janvier 2020 11:00-12:00 - Salle réunion PMMH 1
Wetting hysteresis and dynamics : interpreting dissipation mechanisms at the contact line
A liquid moving over a solid substrate is an everyday occurrence, and the hysteresis and dynamics of the three-phase contact line have been measured in innumerable experiments over the years. In addition, the ingredients needed to describe the phenomenon are known : in the most basic picture, there is viscous (...)
• Séminaire PMMH - Doron Grossman (Collège de France)
Vendredi 17 janvier 2020 11:00-12:00 - Salle réunion PMMH 1
From Molecules to Helical Ribbons - Shape and Shape Fluctuations
* Self assembly of molecules into supramolecular structures is an important process through which non trivial structures are formed in nano-metric scale. The resulting structure depends on chemical and physical principles that govern the process, and may be sensitive to the exact conditions in which they are (...)
• Séminaire PMMH Nicolas Triantafyllidis (LMS polytechnique)
Vendredi 10 janvier 2020 11:00-12:00 - Salle réunion PMMH 1
STABILITY PROBLEMS IN MECHANICS : MULTIPHYSICS AND MULTISCALE ASPECTS (A MECANICIAN'S PERSPECTIVE…)
Stability is a fascinating topic in solid mechanics that has its roots in the celebrated Euler column buckling problem, which ﬁrst appeared in 1744. Over the years advances in technology have led to the study of ever more complicated structures ﬁrst in civil and subsequently in mechanical engineering applications. (...)
• ### 2019

• Séminaire PMMH - Jean-Philippe Bouchaud
Vendredi 20 décembre 2019 11:00-12:00 - Salle réunion PMMH 1
Crises et phénomènes socio-économiques collectifs
Comme l'écrivait P. W. Anderson en 1972 dans « More is different », le comportement de grandes assemblées d'individus ne peut pas être compris à partir de l'extrapolation du comportement d'individus isolés. Au contraire, des comportements complètement nouveaux, parfois spectaculaires et difficiles à anticiper, peuvent (...)
• Séminaire PMMH - Séverine Atis (Harvard University)
Vendredi 13 décembre 2019 11:00-12:00 - Salle réunion PMMH 1
On Growth and Form of Range Expansions at Liquid Interfaces
Range expansions coupled with fluid flows are of great importance in understanding the organization and competition of microorganism populations in liquid environments. However, combining growth dynamics of an expanding assembly of cells with hydrodynamics leads to challenging problems, involving the coupling of (...)
• Séminaire PMMH, Vinod Kumar Saranathan (Yale NUS College)
Vendredi 6 décembre 2019 11:00-12:00 - Salle réunion PMMH 1
Biomimetic and Bio-inspired Potential of Self-assembled Biophotonic Nanostructures
Colors in Nature can be produced either chemically, by the selective light bsorption by pigments, or physically, by light interference from biophotonic nanostructures. Intriguingly, there are almost no known violet, blue or green pigments in animals. And yet these structurally produced colors are ubiquitous in (...)
• Séminaire PMMH — Miguel Fernandez (équipe-projet Commedia, INRIA Paris)
Vendredi 22 novembre 2019 11:00-12:00 - Salle réunion PMMH 1
Numerical methods for fluid-structure interaction with immersed elastic bodies
The mechanical interaction of an incompressible fluid flow with an elastic structure is a multi-physic problem omnipresent in nature and in many engineering fields. One can think, for instance, of the opening/closing dynamics of heart valves when blood is propelled into the arteries and of the wings of a bird (...)
• Séminaire PMMH - Jérôme Fresnais (PHENIX, UPMC)
Vendredi 15 novembre 2019 11:00-12:00 - Salle réunion PMMH 1
Making superhydrophobic surfaces with magnetic elastomer : towards controlled droplet movement
In the field of superhydrophobic surfaces, natural surfaces exhibiting non-wetting filament networks remain a challenge to understand. Indeed, if classical superhydrophobic surfaces developed roughness at different scales, superhydrophobicity on hairy surfaces shows elastic behavior that is more difficult to (...)
• Séminaire PMMH -Julien Bobroff (LPS, Univ. Paris-Sud/Paris-Saclay)
Vendredi 8 novembre 2019 11:00-12:00 - Salle réunion PMMH 1
La physique autrement
Pourquoi vulgariser la physique autrement ? Et surtout comment ? Voilà les deux questions au coeur des activités de notre équipe de recherche. Nous y explorons de nouvelles formes de vulgarisation en lien avec le monde du design et de la création. Parmi nos dernières productions, un objet de médiation sur la (...)
• Séminaire PMMH- Pedro Saenz (University of North Carolina at Chapel Hill)
Vendredi 25 octobre 2019 11:00-12:00 - Salle réunion PMMH 1
Hydrodynamic Spin Lattices
Mesoscale and macroscale analogs of electronic spin systems, such as ultra-cold fermionic lattice gases and mechanical metamaterials, offer direct insights into fundamental physical prin ciples while simultaneously promising groundbreaking applications, from quantum computation and simulators to photonic and (...)
• Séminaire PMMH - Jean Comtet (EPFL)
Vendredi 4 octobre 2019 11:00-12:00 - Salle réunion PMMH 1
Soft matter and mechanics at the molecular scale : from the rheology of few-atoms gold junctions to the observation of single proton transport at solid/water interfaces.
Jean Comtet École Polytechnique Fédérale de Lausanne, Département Sciences et Techniques de l'Ingénieur, CH-1015 Lausanne New paradigms are expected to emerge at the nanometer scale for soft matter and mechanics, stemming from the breakdown of continuum concepts and the appearance of new force scales. I will present (...)
• Séminaire PMMH - Natsuhiko Yoshinaga (Tohoku University)
Lundi 30 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
Model Selection of PDE for Pattern Forming Systems
Partial differential equations (PDE) have been widely used to reproduce patterns in nature, and to give an insight on the mechanism underlying pattern formation. Although enormous number of PDE models have been proposed, they rely on pre-request knowledge of physical laws and symmetries, and one has difficulties (...)
• Séminaire PMMH-Arezki Boudaoud (ENS Lyon)
Vendredi 27 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
From tissue mechanics to plant morphogenesis
The form of organisms relies on the mechanical properties of their cells and tissues. In order to help understanding how plants grow and reach well-defined shapes, we developed a set of experimental and theoretical approaches to quantify tissue mechanics in living plants at multiple scales and to relate such (...)
• Séminaire PMMH - David Saintillan (University of California San Diego)
Vendredi 20 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
Viscous dynamics of passive and active microfilaments
Elastic filaments and semiflexible polymers are ubiquitous in biology, where they play a role in cell mechanics and locomotion as well as for fluid transport on the microscale. In this talk, I will discuss two problems involving the interaction of such filaments with fluid flows. The first problem focuses on the (...)
• Séminaire PMMH - Patrick Bot (Institut de Recherche de l'Ecole Navale)
Vendredi 13 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
From sails aerodynamics to the Lift Crisis (and other results on the lift generated by a highly curved plate)
Yacht sails show some peculiarities among aerodynamic systems. Rather flat sails are used to sail upwind, and the flow remains mostly attached. To sail downwind, highly cambered sails may be used where flow separation is significant. Some results will be shown on the flow around a spinnaker and the related fluid (...)
• Séminaire PMMH - Yukitaka Ishimoto (Akita Prefectural University)
Vendredi 6 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
Biomechanical excursions : from cell shapes to dragonfly wings
In the last decade, much attention has been paid to the physical/mechanical aspects of biological phenomena inside/outside living bodies, owing to the latest technological developments. For example, it becomes possible to directly measure the forces generated by cells on specially designed substrates, or to infer (...)
Lundi 26 août 2019 11:00-12:00 - Salle réunion PMMH 3
• Séminaire PMMH - Farzam Zoueshtiagh (IEMN, Lille)
Vendredi 5 juillet 2019 11:00-12:00 - Salle réunion PMMH 1
Dynamics and stability of a liquid-gas interface in the presence of micro-particles
This French-Japan-US collaborative study examines the influence of the micro-particles on the stability of the liquid-air interface. We will first revisit the effect of these particles on the dynamics of the interface in a confined "1D" geometry [1] with the formation of armored bubbles (fig. 1(a)) and will show (...)
• Séminaire PMMH - Allbens Atman (Centro Federal de Educação Tecnológica de Minas Gerais, Brasil)
Vendredi 28 juin 2019 11:00-12:00 - Salle réunion PMMH 1
Experimental validation of nonextensive scaling law in confined granular media : emergence of shear bands
The statistics of grain displacements probability distribution function (pdf) during the shear of a granular medium displays an unusual dependence with the shear increment upscaling as recently evinced [Phys. Rev. Lett. 115 238301 2015]. Basically, the pdf of grain displacements has clear nonextensive (q-Gaussian) (...)
• Séminaire PMMH-Nicolas Vandewalle (Université de Liège)
Vendredi 21 juin 2019 11:00-12:00 - Salle réunion PMMH 1
Milliswimmers : Self-assembling complex and functional structures at the (sub)millimeter scale
When soft ferromagnetic particles are suspended at air-water interfaces in the presence of a vertical magnetic field, dipole-dipole repulsion competes with capillary attraction such that structures self-assemble. The complex arrangements of such floating bodies are emphasized. By adding a horizontal and (...)
• Séminaire PMMH - Denis Guthleben (CNRS)
Vendredi 7 juin 2019 11:00-12:00 - Salle réunion PMMH 1
Le CNRS, 80... et quelques années d'histoire
Créé par un décret du 19 octobre 1939, le CNRS voit le jour dans un monde qui vient de basculer dans l'abîme : six semaines plus tôt, l'Allemagne nazie a envahi la Pologne et, dans la foulée, l'Angleterre et la France lui ont déclaré la guerre. Dans ce contexte, le nouvel établissement doit piloter la mobilisation (...)
• Séminaire PMMH- Tom Mullin (Univ Oxford)
Vendredi 31 mai 2019 11:00-12:00 - Salle réunion PMMH 1
Levitation by Thin Viscous Layers
The results of experimental investigations into balancing cuboids, cylinders and spheres‘ on a vertical moving wall which is covered a thin layer of viscous fluid are discussed. It is found that balance can be achieved over a narrow range of speeds in all cases. Systematic results for spheres and cylinders have (...)
• Séminaire PMMH - Corrado Rainone (ITP Univ. of Amsterdam)
Vendredi 24 mai 2019 11:00-12:00 - Salle réunion PMMH 1
Addressing the protocol dependence of glass plasticity and yielding
The glassy slowdown is a phenomenon whereupon a liquid, when supercooled below its melting point, exhibits a dramatic slowdown of its dynamics, such that it rapidly becomes impossible to maintain it equilibrated on feasible experimental timescales. The resulting out-of-equilibrium system is referred to as a glass, (...)
• Séminaire PMMH - Michaël Baudoin (IEMN - Université de Lille)
Vendredi 17 mai 2019 11:00-12:00 - Salle réunion PMMH 1
Manipulation of fluid and particles at microscales with selective acoustical tweezers
The selective contactless manipulation and assembly of physical and biological objects and fluids at micrometric down to nanometric scales promises tremendous development in fields as diverse as microrobotics, microfluidics, tissue engineering or micro/nano- medicine. In this regard, acoustical tweezers is a (...)
• Séminaire PMMH-Bertrand Maury (Dpt maths, ENS)
Vendredi 10 mai 2019 11:00-12:00 - Salle réunion PMMH 1
Faster is Slower effect in crowds
The so-called Faster is Slower (FiS) effect is commonly observed in real-life or experimental situations. In the context of evacuation processes, it expresses that increasing the speed (or, more generally, the eagerness to egress) of individuals may induce a reduction of the flow through the exit door. We propose (...)
• Séminaire PMMH - Barakat Abdul (Ladhyx, Polytechnique)
Vendredi 19 avril 2019 11:00-12:00 - Salle réunion PMMH 1
Optimizing the Performance of Endovascular Stents : Cells, Vessels, and Connected Devices
The pathological complications of atherosclerosis, namely heart attacks and strokes, are the leading cause of mortality in the world. The most common treatment for atherosclerosis is the implantation of a stent, a wire-mesh structure that is deployed on a balloon catheter and expanded at the location of arterial (...)
• Séminaire PMMH Michaël Berhanu (MSC)
Vendredi 5 avril 2019 11:00-12:00 - Salle réunion PMMH 1
Nonlinear interactions and turbulence of capillary surface waves
The dynamics of the waves propagating on a water surface is often influenced by nonlinear effects. The complex and disordered patterns of gravity waves seen on a choppy sea are indeed interpreted as a statistical dynamic equilibrium of waves in interaction. Using among some others the hypothesis of weak non (...)
• Séminaire PMMH-Elim Hong (IBPS, Sorbonne Université)
Vendredi 29 mars 2019 11:00-12:00 - Salle réunion PMMH 1
The yin yang pathway in the aversive brain
The habenulo-interpeduncular (Hb-IPN) pathway is an evolutionarily conserved neural pathway mediating diverse pathophysiological behaviors including locomotion, fear, anxiety and nicotine addiction. The left and right habenular nuclei consists of hundreds of neurons that send long axons to project to its target, (...)
• Séminaire PMMH - Corrado Maurini (Inst. J.-L. d'Alembert UPMC)
Vendredi 22 mars 2019 11:00-12:00 - Salle réunion PMMH 1
Nucleation and propagation of cracks in the variational approach to fracture
Damage and fracture in brittle materials are associated to a loss of stiffness and an energy dissipation. These phenomena can be modelled as a minimisation problem on the sum of the elastic and the dissipated energies. This view led a fecund variational theory of fracture and to efficient numerical approximation (...)
• Séminaire PMMH - Shreyas Mandre (Brown Univ., Providence)
Vendredi 15 mars 2019 11:00-12:00 - Salle réunion PMMH 1
Surfactants driven out of equilibrium by a flow
A surfactant is a chemical compound that adsorbs onto a fluid-fluid interface and reduces its surface tension. A non-uniform distribution of such compounds at the interface causes a Marangoni stress that drives a flow, which in turn transports the surfactant. Estimating in situ the degree to which the adsorbed (...)
• Séminaire PMMH Jean-Arthur Olive (ENS)
Vendredi 22 février 2019 11:00-12:00 - Salle réunion PMMH 1
From micro-crack to crustal fault
Major fault systems dissect the Earth's crust at the boundaries of tectonic plates. On human time scales, faults may slip catastrophically during earthquakes, but fault lines remain steady features of tectonic landscapes. On geological time scales, new fault lines can form, shape mountains and basins as they (...)
• Séminaire PMMH - Tobias Schneider (EPFL)
Vendredi 15 février 2019 11:00-12:00 - Salle réunion PMMH 1
A network of invariant solutions underlying spatio-temporal patterns in inclined layer convection
Thermal convection in a fluid between two horizontal plates, a lower hot plate and an upper cold plate, exhibits chaotic dynamics and turbulence. If such a convection cell is inclined against gravity, buoyancy forces drive hot and cold fluid up and down the incline leading to a shear flow in the base state and the (...)
• Séminaire PMMH - Marie Le Merrer (ILM, Univ. Lyon 1)
Vendredi 8 février 2019 11:00-12:00 - Salle réunion PMMH 1
Flow and surfactant dynamics in bubble rearrangements in foams
Liquid foams are assemblies of gas bubbles in a soapy solution, found in many applications from cosmetics to oil drilling. The nature of surfactants changes the properties of the liquid-gas interfaces, and consequently the macroscopic properties of the foam like its stability and rheology. However, the flow (...)
• Séminaire PMMH - Christophe Gissinger (ENS)
Vendredi 1er février 2019 11:00-12:00 - Salle réunion PMMH 1
Instabilités dans les écoulements entraînés par forçage magnétique
La conversion d'énergie électromagnétique en énergie cinétique par un fluide conducteur de l'électricité est un phénomène omniprésent que l'on trouve dans plusieurs systèmes naturels ainsi que dans de nombreuses applications industrielles. Malgré l'importance de ces applications, plusieurs aspects des écoulements (...)
• Séminaire PMMH - Sophie Ramananarivo (LadHyX, École Polytechnique)
Vendredi 18 janvier 2019 11:00-12:00 - Salle réunion PMMH 1
Emergent order, from fish schools to colloidal crystals
It has long been thought that fish form into schools and birds into flocks so that each individual can take advantage of the flows produced by others. Using physical experiments that mimic the movements of fins or wings, we discover that flapping bodies not only swim or fly faster when grouped together but that (...)
• Séminaire PMMH - Bernadette Bensaude-Vincent (Univ. Paris 1)
Vendredi 11 janvier 2019 11:00-12:00 - Salle réunion PMMH 1
Dialogue avec les matériaux
Cette intervention est une invite à penser les matériaux comme des partenaires de nos aventures techniques. Après un bref historique des conditions d'émergence de la science des matériaux on montrera en quel sens les matériaux sont des hybrides de nature, de technique et de société. Et on illustrera cette condition (...)
• ### 2018

• Séminaire PMMH - Emmanuel Virot (EPFL - Harvard University)
Vendredi 21 décembre 2018 11:00-12:00 - Salle réunion PMMH 1
Non-destructive prediction of the buckling load of soda cans and space rockets
What is the critical load required to crush a soda can or a space rocket shell ? Surprisingly, there is no good way to estimate it, because of the high defect-sensitivity of the buckling instability. Here we measure the response of (imperfect) empty Coca-Cola cans to lateral poking and identify a generic stability (...)
• Séminaire PMMH - Ory Schnitzer ( Imperial College London)
Vendredi 14 décembre 2018 11:00-12:00 - Salle réunion PMMH 1
Asymptotic models of wave propagation and resonance in micro-structured media
The study of microstructured media in acoustic settings is undergoing a considerable revival, with ideas originating from electromagnetism, photonic crystals and metamaterials influencing structured acoustic devices. Fundamentally, these advancements rely on incorporating resonances to effectively control wave (...)
• Séminaire PMMH - Dimitry Kolomenskiy (JAMSTEC, Japon)
Vendredi 7 décembre 2018 11:00-12:00 - Salle réunion PMMH 1
Bumblebee in flight and in digit
Flight as a mode of animal locomotion emerges from interaction of internal biological systems with the external environment. Although it is currently, or even generally, unrealistic to fully reduce this problem to first principles, it proves possible and useful to combine low-dimensional models of biological (...)
• Séminaire PMMH - Nicolas Taberlet (UCBL - ENS Lyon)
Vendredi 30 novembre 2018 11:00-12:00 - Salle réunion PMMH 1
Morphogenèse glaciaire induite par ablation différentielle
Les processus d'ablation de la glace sont multiples, la sublimation et la fonte étant dépendantes des conditions climatiques (ensoleillement, température, humidité, précipitations, vent…). Nous avons étudié la morphogenèse des « Zen Stones » qui se forment essentiellement sur le lac Baïkal au cours de la saison hivernale. (...)
• Séminaire PMMH - Pierre Jop (SVI, Saint-Gobain)
Vendredi 23 novembre 2018 11:00-12:00 - Salle réunion PMMH 1
Vers un matériau granulaire humide : quand la capillarité contrôle les interfaces
Le mélange de grains avec un liquide est souvent la première étape d'un processus industriel, mais la nature triphasique du milieu rend la description globale difficile [1] : la cohésion des ponts capillaires [2] et la progression du liquide dans le système créent des zones de comportements mécaniques différents. De (...)
• Séminaire PMMH - Lucio Isa (ETH, Zurich)
Vendredi 16 novembre 2018 11:00-12:00 - Salle réunion PMMH 1
Breaking the symmetry : Designing colloidal motors and swimming at oil-water interfaces
Breaking symmetry is at the very core of achieving propulsion at the microscale, where viscous forces dominate. Nature has perfected a range of different strategies to reach this goal for swimming microorganisms, which scientists have taken inspiration from to produce artificial micro-swimmers [1]. A common way to (...)
• Séminaire PMMH - Mark Pauly (EPFL)
Vendredi 9 novembre 2018 11:00-12:00 - Salle réunion PMMH 1
Light, Matter, Form - Computational Design of Functional Geometry
In this talk, I will outline a general computational approach for material-aware design of complex 3D models. The key step is to identify suitable geometric abstractions of physical properties that enable effective computations with high predictive accuracy. I will show several examples of this approach for (...)
• Séminaire PMMH - Thomas Lessinnes (EPFL)
Vendredi 19 octobre 2018 11:00-12:00 - Salle réunion PMMH 1
New tools for the mechanics of biofilaments
Many biological objects present themselves as elongated slender structures. One may for instance mention proteins, polymers, DNA, bacterial fibres, fungi, stems, roots, arteries or neurons to cite but a few. It so happens that these bio-filaments are often organised as bundles of sub-filaments. The interplay of (...)
• Séminaire PMMH- Nicolas FRANCOIS (The Australian National University)
Vendredi 12 octobre 2018 11:00-12:00 - Salle réunion PMMH 1
Surfing wave driven turbulence at a fluid surface
Nicolas FRANCOIS, Hua XIA, Horst PUNZMANN, Michael SHATS Physics of Fluids Laboratory, The Australian National University When a laminar flow becomes turbulent, its energy is spread over a range of scales in a process named energy cascade. It has recently been discovered that turbulent flows can be forced by (...)
• Séminaire PMMH - Laurent Duchemin (IRPhE, Marseille)
Vendredi 5 octobre 2018 11:00-12:00 - Salle réunion PMMH 1
Deux écoulements capillaires impulsionnels
Dans cet exposé, je présenterai deux études expérimentales et théoriques sur des écoulements ayant une dynamique rapide à une échelle capillaire. La première concerne l'étirement impulsionnel d'un ligament liquide millimétrique. Dans le contexte général de la fragmentation, cette expérience modèle permet à la fois d'étudier (...)
• Séminaire PMMH - Sara Jabbari Farouji (Gutenberg University, Mainz, Germany)
Vendredi 28 septembre 2018 11:00-12:00 - Salle réunion PMMH 1
Controlling stability and transport of magnetic microswimmers by an external field
Inspired by intriguing dynamics of magnetotactic bacteria, we present a minimal kinetic model for magnetic swimmers in an external magnetic field to investigate their collective behavior. Our kinetic model couples a Fokker-Planck equation for active particles in an external magnetic field to the Stokes flow. (...)
• Séminaire PMMH - Marc Durand (MSC, Univ. Paris Diderot)
Vendredi 21 septembre 2018 11:00-12:00 - Salle réunion PMMH 1
Milieux cellulaires fluides et réseaux : microstructure et propriétés effectives
Les propriétés structurelles (géométrie, topologie, désordre) d'un matériau à l'échelle de ses constituants affectent profondément ses propriétés effectives, telles que sa réponse mécanique ou acoustique. Au cours de ce séminaire, je présenterai diverses études visant à caractériser - de manière exacte ou statistique - les (...)
• Séminaire PMMH - Hans Herrmann (ETH, Zürich)
Vendredi 14 septembre 2018 11:00-12:00 - Salle réunion PMMH 1
Structures granulaires renforcées par un fil et éjections granulaires d'un milieu poreux
Je vais présenter deux sujets granulaires : Le premier c'est la stabilisation d'une colonne granulaire avec un fil. Il s'agit de comprendre avec des expériences et des simulations numériques pourquoi et comment stabilisent des piliers renforcés par ficelle selon une nouvelle technique développée par des architectes. (...)
• Séminaire PMMH - Fernando Peruani (Univ. de Nice)
Vendredi 7 septembre 2018 11:00-12:00 - Salle réunion PMMH 1
Towards a non-equilibrium statistical mechanics of biological and biomimetic systems
Collective phenomena are observed in biological and biomimetic systems at all scales, from bacterial systems to sheep herds in biology, and from Quincke rollers to bristlebots or kilobots in man-made, active systems. Provided that these non-equilibrium systems consist of independent units without a central control (...)
• Séminaire PMMH : Antonio de Simone (Trieste)
Vendredi 13 juillet 2018 11:00-12:00 - Salle réunion PMMH 1
Biological and bio-inspired motility at microscopic scales : locomotion by shape control
Locomotion strategies employed by unicellular organism are a rich source of inspiration for studying mechanisms for shape control. In fact, in an overwhelming majority of cases, biological locomotion can be described as the result of the body pushing against the world, by using shape change. Motion is then a (...)
• Séminaire PMMH - Federico Toschi (Technische Universiteit, Eindhoven)
Vendredi 6 juillet 2018 11:00-12:00 - Salle réunion PMMH 1
Turbulence and plastic events in fluid emulsions
Emulsions made of immiscible fluids can display an very rich phenomenology. In this talk we will discuss how to numerically model fluid emulsions and we will present results from recent numerical studies. The numerical model that we employ is based on the multi-component Lattice Boltzmann method as it provides a (...)
• Séminaire PMMH - Philippe Marcq (Institut Curie)
Vendredi 29 juin 2018 11:00-12:00 - Salle réunion PMMH 1
From cells to tissue : A continuum model of epithelial mechanics
A continuum model of epithelial tissue mechanics is formulated using cellular-level mechanical ingredients and cell morphogenetic processes, including cellular shape changes and cellular rearrangements. This model incorporates stress and deformation tensors, which can be compared with experimental data. Focusing (...)
• Séminaire PMMH - Alexander Alexeev (Georgia Tech)
Vendredi 22 juin 2018 11:00-12:00 - Salle réunion PMMH 1
Biomimetic flapping and beating in viscous fluid
We probe interactions of elastic structures with viscous fluids to investigate biomimetic approaches for fluid manipulation. We consider two systems : fish-like elastic fines and artificial cilia. Fish displays incredible agility and speed using oscillating flexible fins. We represent fins as thin elastic plates (...)
• Séminaire PMMH - Ludovic Bellon (ENS Lyon)
Vendredi 15 juin 2018 11:00-12:00 - Salle réunion PMMH 1
Interrupteur optique, ondes gravitationnelles et physique statistique hors d'équilibre : des microleviers à tout faire
Dans cette présentation, je montrerai comment le bruit thermique, loin d'être une simple nuisance, peut être un outil de précision dans l'exploration des matériaux autant qu'une porte ouverte sur des phénomènes de physique statistique intrigants. Guidée par la sérendipité, cette marche aléatoire de la physique à l'échelle (...)
• Séminaire PMMH : Thomas Engels (LMD, ENS)
Vendredi 8 juin 2018 11:00-12:00 - Salle réunion PMMH 1
The impact of turbulence on flying insects in tethered and free flight : high-resolution numerical experiments
Flapping insects are remarkably agile fliers, adapted to a highly turbulent environment. We present a series of high resolution numerical simulations of a bumblebee interacting with fully developed turbulent inflow. We consider both tethered and free flight, the latter with all six degrees of freedom coupled to (...)
• Séminaire PMMH - John Kolinski (EPFL)
Vendredi 1er juin 2018 11:00-12:00 - Salle réunion PMMH 1
Wetting and contact line propagation on solid surfaces
John M. Kolinski, EMSI, EPFL, Lausanne Switzerland The propagation of a contact line at the interface between liquid and a dry solid is of great fundamental and practical importance. We experimentally probe the dynamics of wetting that occur when an impacting drop first contacts a dry surface. We show that the (...)
• Séminaire PMMH - Alba Marcellan (SIMM, ESPCI)
Vendredi 25 mai 2018 11:00-12:00 - Salle réunion PMMH 1
Some strategies for hydrogel toughening, from polymer adsorption onto NPs to responsive toughening by phase-separation
Based on gel's remarkable features of absorption, storage or release of water (or solvent), gels have become essential in engineering applications like superabsorbent, soilless agriculture or tissue engineering and regeneration. Gels could also be key players for the design of flexible actuators, valves or (...)
• Séminaire PMMH - Aleksandra Walczak (ENS - LPT)
Vendredi 18 mai 2018 11:00-12:00 - Salle réunion PMMH 1
Learning how bird flocks coordinate
Flocking is a typical example of emergent collective behavior, where interactions between individuals produce collective patterns on large scales. I will discuss how by analysing different aspect of this motion based on quantitative data we can learn about the origins of these interactions. Specifically I will (...)
• Séminaire PMMH - Giuseppe Zurlo (National University of Ireland)
Vendredi 13 avril 2018 11:00-12:00 - Salle réunion PMMH 1
Manufacturing of information-rich elastic bodies through surface deposition.
In this talk I will discuss a recent theory, developed in collaboration with Lev Truskinovsky, that describes how desired distributions of residual stress can be achieved in bodies that are manufactured though the local addition of mass on their boundary [1],[2]. The source of residual stresses in elastic bodies (...)
• Séminaire PMMH - Etienne Guyon
Vendredi 6 avril 2018 11:00-12:00 - Salle réunion PMMH 1
Une brève histoire des musées de sciences jusqu'au Palais de la Découverte aujourd'hui et demain (?)
Au-delà de la diversité des conditions de leurs créations et de leurs fonctionnements dans l'histoire, on retrouve dans l'histoire des Musées des composantes universelles. Tout en faisant références à d'autres expériences culturelles scientifiques, nous axerons notre présentation sur quatre grands musées français. Tout (...)
• Séminaire Charlotte K. Hemelrijk (Univ. Groningen)
Mercredi 4 avril 2018 11:00-12:00 - Salle réunion PMMH 2
• Séminaire PMMH - Leonardo Gordillo (Universidad De Santiago de Chile)
Vendredi 30 mars 2018 11:00-12:00 - Salle réunion PMMH 1
Drop-impact dynamics on solid surfaces : Evolution of impact force
In this talk, I will give an overview of our latest advances in understanding the dynamics of drop impacts on dry solid surfaces. By synchronizing high-speed photography with fast force sensing, we simultaneously measured the temporal evolution of the shape and impact force of impacting drops over a wide range of (...)
• Séminaire PMMH - Falko Ziebert (Universität Heidelberg)
Vendredi 9 mars 2018 11:00-12:00 - A1 (Urbain)
Self-propelled motion of biological cells and polymeric fibers
Self-propulsion, i.e. self-organized motion in the absence of external forces, is an active research topic in non-equilibrium physics. Depending on the system, open questions span from the propulsive force generation and transfer over guiding mechanisms to collective effects in ensembles of self-propellers. The (...)
Information for the speakers

The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.

## Practical information

Laboratoire : 01 40 79 45 22
Directeur : Damien Vandembroucq
Codirecteur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel :