A5101883737- Nonlinear Dynamics and Pattern Formation
- Advanced Thermodynamics and Statistical Mechanics
- Fluid Dynamics and Thin Films
- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Solid State Laser Technologies
- Complex Systems and Time Series Analysis
- Solidification and crystal growth phenomena
- Fluid Dynamics and Turbulent Flows
- Statistical Mechanics and Entropy
- stochastic dynamics and bifurcation
- Medical Imaging Techniques and Applications
- Ocean Waves and Remote Sensing
- Ancient Mediterranean Archaeology and History
- Meteorological Phenomena and Simulations
- Quantum Electrodynamics and Casimir Effect
- Thermal Radiation and Cooling Technologies
- Neuroscience and Music Perception
- Atomic and Subatomic Physics Research
- Music Technology and Sound Studies
- Heart Rate Variability and Autonomic Control
- Plant Water Relations and Carbon Dynamics
- Neural dynamics and brain function
- Neonatal and fetal brain pathology
- Archaeology and Historical Studies
Laboratoire de Physique de l'ENS de Lyon
2015-2024
École Normale Supérieure de Lyon
2014-2024
Archéologie et Philologie d’Orient et d’Occident
2012-2024
Centre National de la Recherche Scientifique
2015-2024
École Normale Supérieure - PSL
2012-2024
Université Claude Bernard Lyon 1
2004-2023
Service de Physique de l'État Condensé
1998-2018
École Normale Supérieure
2018
École Normale Supérieure d'Abidjan
2018
ProbaYes (France)
2017
In small systems where relevant energies are comparable to thermal agitation, fluctuations of the order average values. in thermodynamical equilibrium, variance these can be related dissipation constant system, exploiting fluctuation-dissipation theorem. nonequilibrium steady systems, theorems (FT) additionally describe symmetry properties probability density functions (PDFs) injected and dissipated energies. We experimentally probe a model system: an electrical dipole driven out equilibrium...
In this paper we derive expressions for the laser slope efficiency and threshold absorbed pump power which explicitly include excited-state absorption in as well laser-emission-wavelength domains. They are applied to case of diode-pumped ${\mathrm{Nd}}^{3+}$-doped systems and, along with allowing calculation excited-state-absorption (ESA) cross sections within framework Judd-Ofelt theory, they provide a theoretical second part present both experimental measurements calibrations an analysis...
The time-reversal symmetry of nonequilibrium fluctuations is experimentally investigated in two out-of-equilibrium systems: namely, a Brownian particle trap moving at constant speed and an electric circuit with imposed mean current. dynamical randomness their characterized terms the standard time-reversed entropies per unit time systems theory. We present experimental results showing that difference equals thermodynamic entropy production units Boltzmann's constant.
The work fluctuations of an oscillator in contact with a thermostat and driven out equilibrium by external force are studied experimentally theoretically within the context fluctuation theorems. dynamics is modeled second order Langevin equation. Both transient stationary state theorems hold finite time corrections very different from those first periodic forcing also studied; it presents new unexpected short convergences. Analytical expressions given all cases.
We report experiments on buoyant-thermocapillary instabilities in differentially heated liquid layers. The results are obtained for a fluid of Prandtl number 10 rectangular geometry with different aspect ratios. Depending the height and ratios, two-dimensional basic flow destabilizes into oblique traveling waves or longitudinal stationary rolls, respectively, small large heights. Temperature measurements space–time recordings reveal to correspond hydrothermal predicted by linear stability...
A novel optical method is used both to probe and control dynamics in experiments on the spreading of microscale liquid films over solid substrates. The flow manipulated by thermally induced surface-tension gradients that are regulated controlling absorption light substrate. This approach permits, for first time, measurement dispersion relation well-known contact line instability; measurements compared with theoretical predictions from slip model films. also demonstrate use feedback suppress...
We apply the Hilbert transform to physics of internal waves in two-dimensional fluids. Using this demodulation technique, we can discriminate propagating different directions: This is very helpful answering several fundamental questions context waves. focus more precisely paper on phenomena associated with dissipation, diffraction, and reflection
Abstract This study evaluates the performance of analog-based methodologies to predict, in a statistical way, longitudinal velocity turbulent flow. The data used comes from hot wire experimental measurements Modane wind tunnel. We compared different methods and explored impact varying number analogs their sizes on prediction accuracy. illustrate that innovation, defined as difference between true value value, highlights particularly unpredictable events we directly link with extreme...
We study experimentally the thermal fluctuations of energy input and dissipation in a harmonic oscillator driven out equilibrium, search for fluctuation relations. Both transient evolution from equilibrium state, non-equilibrium steady states are analyzed. Fluctuation relations obtained both work heat, stationary evolutions. A state theorem is verified various time dependences imposed external torque. The satisfied given to system but not heat dissipated by case linear forcing. Experimental...
For generic systems exhibiting power law behaviors, and hence multiscale dependencies, we propose a new, yet simple, tool to analyze multifractality intermittency, after noticing that these concepts are directly related the deformation of probability density function from Gaussian at large scales non-Gaussian smaller scales. Our framework is based on information theory, uses Shannon entropy Kullback-Leibler divergence. We an extensive application three-dimensional fully developed turbulence,...
We here present the complete analysis of experiments on driven Brownian motion and electric noise in an RC circuit, showing that thermodynamic entropy production can be related to breaking time-reversal symmetry statistical description these non-equilibrium systems. The expressed terms dynamical entropies per unit time, one for forward process other time-reversed process. These time characterize randomness, i.e., temporal disorder, series fluctuations. Their difference gives well-known...
Among the different indicators that quantify spread of an epidemic such as on-going COVID-19, stands first reproduction number which measures how many people can be contaminated by infected person. In order to permit monitoring evolution this number, a new estimation procedure is proposed here, assuming well-accepted model for current incidence data, based on past observations. The novelty approach twofold: 1) achieved convex optimization within proximal-based inverse problem formulation,...
Fluctuations of the total entropy are experimentally investigated in two stochastic systems a non-equilibrium steady state: an electric circuit with imposed mean current and harmonic oscillator driven out equilibrium by periodic torque. In these linear systems, we study production which is created to maintain system state. The fluctuation theorem holds for experimental both all observation times magnitudes.
This paper proposes a first attempt to study quantitatively Collective Free Improvisation (CFI). We report an experiment designed the relationship between improvisers' individual high-level decisions and improvisation's form perceived by external auditors. recorded 16 trios in which improvisers used MIDI-pedal indicate real-time significant change their own musical production. Expert listeners were later asked segment each improvisation so that we obtained perception of structure. By...
We propose a new perspective on turbulence using information theory. compute the entropy rate of turbulent velocity signal and we particularly focus its dependence scale. first report how is able to describe distribution amongst scales, one can use it isolate injection, inertial dissipative ranges, in perfect agreement with Batchelor model fractional Brownian motion (fBM) model. provide analytical derivations scalings these two models. In second stage, design conditioning procedure order...
The work described in this paper concerns the study of a Bénard–Marangoni convection problem differentially heated cylindrical cavity. had two main aims; first to justify from numerical point view transitions that have been reported several experiments as aspect ratio is varied and, second, both theoretically and experimentally role vertical horizontal temperature differences lateral heating convection. Initially, we analyzed layers where dynamic flow imposed through nonzero gradient at...