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author = "Ciliberto, Sergio"
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Found 79 documents, displaying page 1 of 8

Off equilibrium fluctuations in a polymer glass.

Author(s) : Buisson, Lionel , Ciliberto, Sergio
Description : The fluctuation-dissipation relation (FDR) is measured on the dielectric properties of a polymer glass (polycarbonate). It is observed that the fluctuation dissipation theorem is strongly violated after a quench from above to below the glass transition temperature. The amplitude and the persistence ...
Repository : HAL - Hyper Article on Line
Language(s) : English

Nonequilibrium fluctuations in a resistor

Author(s) : Garnier, Nicolas , Ciliberto, Sergio
Description : In small systems where relevant energies are comparable to thermal agitation, fluctuations are of the order of average values. In systems in thermodynamical equilibrium, the variance of these fluctuations can be related to the dissipation constant in the system, exploiting the Fluctuation-Dissipatio...
Repository : HAL - Hyper Article on Line
Language(s) : English

Experimental study of the statistics of slipping events in solid friction

Author(s) : Ciliberto, Sergio , Laroche, Claude
Description : The statistics of the stick-slip motion is studied in two experiments, where elasticity is distributed either on a surface or on a volume. The rough surface is realised by embedding steel spheres in an elastic substrate whereas the volume is constituted by several layers of rubber spheres. Both syst...
Repository : HAL - Hyper Article on Line
Language(s) : English

Experimental study of the Fluctuation-Dissipation-Relation during an aging process

Author(s) : Bellon, Ludovic , Ciliberto, Sergio
Description : The validity of fluctuation dissipation relations in an aging system is studied in a colloidal glass during the transition from a fluid-like to a solid-like state. The evolution of the rheological and electrical properties is analyzed in the range $1Hz - 40Hz$. It is found that at the beginning of...
Repository : arXiv
Language(s) : Undetermined

Heat fluctuations for harmonic oscillators

Author(s) : Joubaud, Sylvain , Garnier, Nicolas , Ciliberto, Sergio
Description : Heat fluctuations of a harmonic oscillator in contact with a thermostat and driven out of equilibrium by an external deterministic force are studied experimentally and theoretically within the context of Fluctuation Theorems. We consider the case of a periodic forcing of the oscillator, and we calcu...
Repository : HAL - Hyper Article on Line
Language(s) : English

Slow crack growth : models and experiments

Author(s) : Santucci, Stéphane , Vanel, Loïc , Ciliberto, Sergio
Description : The properties of slow crack growth in brittle materials are analyzed both theoretically and experimentally. We propose a model based on a thermally activated rupture process. Considering a 2D spring network submitted to an external load and to thermal noise, we show that a preexisting crack in the ...
Repository : HAL - Hyper Article on Line
Language(s) : English

Fluctuation theorems for harmonic oscillators

Author(s) : Joubaud, Sylvain , Garnier, Nicolas , Ciliberto, Sergio
Description : We study experimentally the thermal fluctuations of energy input and dissipation in a harmonic oscillator driven out of equilibrium, and search for Fluctuation Relations. We study transient evolution from the equilibrium state, together with non equilibrium steady states. Fluctuations Relations are ...
Repository : HAL - Hyper Article on Line
Language(s) : English

Comment on ''Measurement of Effective Temperatures in an Aging Colloidal Glass''

Author(s) : Jop, Pierre , Petrosyan, Artyom , Ciliberto, Sergio
Description : We measure the fluctuations of the position of a silica bead trapped by an optical tweezers during the aging of a Laponite suspension. We find that the effective temperature is equal to the bath temperature.
Repository : HAL - Hyper Article on Line
Language(s) : English

Sub-critical statistics in rupture of fibrous materials : experiments and model.

Author(s) : Santucci, Stéphane , Vanel, Loïc , Ciliberto, Sergio
Description : We study experimentally the slow growth of a single crack in a fibrous material and observe stepwise growth dynamics. We model the material as a lattice where the crack is pinned by elastic traps and grows due to thermally activated stress fluctuations. In agreement with experimental data we find th...
Repository : HAL - Hyper Article on Line
Language(s) : English

Fluctuations of the total entropy production in stochastic systems

Author(s) : Joubaud, Sylvain , Garnier, Nicolas , Ciliberto, Sergio
Description : Fluctuations of the excess heat in an out of equilibrium steady state are experimentally investigated in two stochastic systems : an electric circuit with an imposed mean current and a harmonic oscillator driven out of equilibrium by a periodic torque. In these two linear systems, we study excess he...
Repository : HAL - Hyper Article on Line
Language(s) : English
1 2 3 4 5 > >>

Found 79 documents, displaying page 1 of 8