
BibTeX:
@techreport{Aumaitre2014, author = {S. Aumaître}, title = {Fluctuations and instabilities in Outofequilibrium systems}, year = {2014} } 

Abstract: We analyze the intermittent dynamics of cracks in heterogeneous brittle materials and the roughness of the resulting fracture surfaces by investigating theoretically and numerically crack propagation in an elastic solid of spatiallydistributed toughness. The crack motion splits up into discrete jumps, avalanches, displaying scalefree statistical features characterized by universal exponents. Conversely, the ranges of scales are nonuniversal and the mean avalanche size and duration depend on the loading microstructure and specimen parameters according to scaling laws which are uncovered. The crack surfaces are found to be logarithmically rough. Their selection by the fracture parameters is formulated in term of scaling laws on the structure functions measured on onedimensional roughness profiles taken parallel and perpendicular to the direction of crack growth. 
BibTeX:
@article{Bares2014a, author = {J. Barés and M. Barlet and C. L. Rountree and L. Barbier and D. Bonamy}, title = {Nominally brittle cracks in inhomogeneous solids: From microstructural disorder to continuumlevel scale}, journal = {Frontiers in Physics}, year = {2014}, volume = {2}, number = {70}, url = {http://www.frontiersin.org/interdisciplinary_physics/10.3389/fphy.2014.00070/abstract}, doi = {10.3389/fphy.2014.00070} } 

BibTeX:
@article{Bares2014, author = {Barés, J. and Hattali, M.L. and Dalmas, D. and Bonamy, D.}, title = {Fluctuations of Global Energy Release and Crackling in Nominally Brittle Heterogeneous Fracture}, journal = {Physical Review Letters}, publisher = {American Physical Society}, year = {2014}, volume = {113}, pages = {264301}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.113.264301}, doi = {10.1103/PhysRevLett.113.264301} } 

Abstract: Abstract This paper's focus is the failure and hardness properties of pure amorphous silica (Corning 7980Â®) after Î²irradiation at different doses (02 GGy). Crack propagation takes place in the SCC regime (1071010 m.s1) and Vickers indentation techniques probe the hardness properties of the samples. Irradiation is found to create point defects which mainly include Eâ centers, NonBridging Oxygen Hole Centers and Peroxy Radicals. Î²irradiation herein invokes minor changes in the structure. A small effect of Î²irradiation on SCC and hardness variations cannot be eliminated, despite minute variations in the SCC and the hardness properties. 
BibTeX:
@article{Barlet2014, author = {M. Barlet and JM. Delaye and M. Gennisson and R. Caraballo and B. Boizot and D. Bonamy and C.L. Rountree}, title = {Influence of Electronic Irradiation on Failure and Hardness Properties of Pure Silica Glasses }, journal = {Procedia Materials Science }, year = {2014}, volume = {7}, number = {0}, pages = {286  293}, note = {2nd International Summer School on Nuclear Glass Wasteform: Structure, Properties and LongTerm Behavior, SumGLASS 2013 }, url = {http://www.sciencedirect.com/science/article/pii/S2211812814010803}, doi = {10.1016/j.mspro.2014.10.037} } 

Abstract: In vivo measurements of the passive movements of biomolecules or vesicles in cells consistently report "anomalous diffusion," where meansquared displacements scale as a power law of time with exponent alpha < 1 (subdiffusion). While the detailed mechanisms causing such behaviors are not always elucidated, movement hindrance by obstacles is often invoked. However, our understanding of how hindered diffusion leads to subdiffusion is based on diffusion amidst randomly located immobile obstacles. Here, we have used Monte Carlo simulations to investigate transient subdiffusion due to mobile obstacles with various modes of mobility. Our simulations confirm that the anomalous regimes rapidly disappear when the obstacles move by Brownian motion. By contrast, mobile obstacles with more confined displacements, e. g., OrsteinUlhenbeck motion, are shown to preserve subdiffusive regimes. The meansquared displacement of tracked protein displays convincing power laws with anomalous exponent alpha that varies with the density of OrsteinUlhenbeck (OU) obstacles or the relaxation time scale of the OU process. In particular, some of the values we observed are significantly below the universal value predicted for immobile obstacles in two dimensions. Therefore, our results show that subdiffusion due to mobile obstacles with OU type of motion may account for the large variation range exhibited by experimental measurements in living cells and may explain that some experimental estimates are below the universal value predicted for immobile obstacles. 
BibTeX:
@article{Berry2014, author = {Berry, Hugues and Chate, Hugues}, title = {Anomalous diffusion due to hindering by mobile obstacles undergoing Brownian motion or OrsteinUlhenbeck processes}, journal = {Physical Review E}, year = {2014}, volume = {89}, number = {2}, pages = {022708}, doi = {10.1103/PhysRevE.89.022708} } 

Abstract: A comment on the contribution of T. Ihle [1] in this special issue. 
BibTeX:
@article{Bertin2014, author = {Bertin, E. and Chate, H. and Ginelli, F. and Gregoire, G. and Leonard, S. and Peshkov, A.}, title = {Comment on Ihle, "Towards a quantitative kinetic theory of polar active matter"}, journal = {European Physical Journalspecial Topics}, year = {2014}, volume = {223}, number = {7}, pages = {14191422}, doi = {10.1140/epjst/e2014022023} } 

Abstract: Although silicate glass is considered as the archetype of brittle materials, which break without deforming irreversibly, its fracture involves some dissipation. By examining the postmortem fracture surfaces, by following in situ the progression of a stress corrosion crack and by measuring the depth of penetration of water in the material during slow fracture, we show that glass behaves in fact in a quasibrittle manner, with a damaged zone of similar to 10 nm developing ahead of the crack tip. (C) 2014 Published by Elsevier Masson SAS on behalf of Academie des sciences. 
BibTeX:
@article{Bouchaud2014, author = {Bouchaud, Elisabeth}, title = {Is glass brittle at all scales?}, journal = {Comptes Rendus Physique}, year = {2014}, volume = {15}, number = {6}, pages = {527535}, doi = {10.1016/j.crhy.2014.06.002} } 

Abstract: We determine the basic phase diagram of the fish school model derived from data by Gautrais et al (2012 PLoS Comput. Biol. 8 e1002678), exploring its parameter space beyond the parameter values determined experimentally on groups of barred flagtails (Kuhlia mugil) swimming in a shallow tank. A modified model is studied alongside the original one, in which an additional frontal preference is introduced in the stimulus/response function to account for the angular weighting of interactions. Our study, mostly limited to groups of moderate size (in the order of 100 individuals), focused not only on the transition to schooling induced by increasing the swimming speed, but also on the conditions under which a school can exhibit milling dynamics and the corresponding behavioural transitions. We show the existence of a transition region between milling and schooling, in which the school exhibits multistability and intermittence between schooling and milling for the same combination of individual parameters. We also show that milling does not occur for arbitrarily large groups, mainly due to a distance dependence interaction of the model and information propagation delays in the school, which cause conflicting reactions for large groups. We finally discuss the biological significance of our findings, especially the dependence of behavioural transitions on social interactions, which were reported by Gautrais et al to be adaptive in the experimental conditions. 
BibTeX:
@article{Calovi2014, author = {Calovi, Daniel S. and Lopez, Ugo and Ngo, Sandrine and Sire, Clement and Chate, Hugues and Theraulaz, Guy}, title = {Swarming, schooling, milling: phase diagram of a datadriven fish school model}, journal = {New Journal of Physics}, year = {2014}, volume = {16}, pages = {015026}, doi = {10.1088/13672630/16/1/015026} } 

Abstract: We show that hydrodynamic theories of polar active matter generically possess inhomogeneous traveling solutions. We introduce a unifying dynamicalsystem framework to establish the shape of these intrinsically nonlinear patterns, and show that they correspond to those hitherto observed in experiments and numerical simulation: periodic density waves, and solitonic bands, or polarliquid droplets both cruising in isotropic phases. We elucidate their respective multiplicity and mutual relations, as well as their existence domain. 
BibTeX:
@article{Caussin2014, author = {Caussin, JeanBaptiste and Solon, Alexandre and Peshkov, Anton and Chate, Hugues and Dauxois, Thierry and Tailleur, Julien and Vitelli, Vincenzo and Bartolo, Denis}, title = {Emergent Spatial Structures in Flocking Models: A Dynamical System Insight}, journal = {Physical Review Letters}, year = {2014}, volume = {112}, number = {14}, pages = {148102}, doi = {10.1103/PhysRevLett.112.148102} } 

Abstract: Given the secondorder scalar Lax pair of the sixth PainlevÃ© equation, we build a generalized heat equation with rational coefficients which does not depend any more on the PainlevÃ© variable. 
BibTeX:
@article{Conte2014, author = {R. Conte and I. Dornic}, title = {The master Painlevé VI equation}, journal = {Comptes Rendus Mathematique }, year = {2014}, volume = {352}, number = {10}, pages = {803  806}, note = {http://arxiv.org/abs/1409.1166}, doi = {10.1016/j.crma.2014.08.006} } 

Abstract: The nonlinear stationary response of an assembly of long range interacting electric dipoles is calculated via Berne's nonlinear rotational diffusion equation [J. Chem. Phys. 62 1154 (1975)]. Analytical formulas are derived, showing that the behavior of omega and 3 omega components of the nonlinear external field response spectra in such polar dielectrics strongly deviates from the CoffeyParanjape formulas [Proc. R. Ir. Acad., Sect. A 78, 17 (1978)] as the long range dipoledipole interactions increase, while the linear response remains qualitatively unaffected. By qualitatively comparing with recent experimental measurements on glycerol, it is further demonstrated that nonlinear dielectric response experiments provide a powerful tool for the characterization of short range intermolecular interactions in polar liquids. (C) 2014 AIP Publishing LLC. 
BibTeX:
@article{Dejardin2014, author = {Dejardin, P. M. and Ladieu, F.}, title = {Nonlinear susceptibilities of interacting polar molecules in the selfconsistent field approximation}, journal = {Journal of Chemical Physics}, year = {2014}, volume = {140}, number = {3}, doi = {10.1063/1.4855195} } 

Abstract: We apply a new threshold detection method based on the extreme value theory (EVT) to the von Karman sodium (VKS) experiment data. The VKS experiment is a successful attempt to get a dynamo magnetic field in a laboratory liquidmetal experiment. We first show that the dynamo threshold is associated with a change of the probability density function of the extreme values of the magnetic field. This method does not require the measurement of response functions from applied external perturbations and thus provides a simple threshold estimate. We apply our method to different configurations in the VKS experiment, showing that it yields a robust indication of the dynamo threshold as well as evidence of hysteretic behaviors. Moreover, for the experimental configurations in which a dynamo transition is not observed, the method provides a way to extrapolate an interval of possible threshold values. 
BibTeX:
@article{Faranda2014a, author = {Faranda, D. and Bourgoin, M. and Miralles, S. and Odier, P. and Pinton, J.F. and Plihon, N. and Daviaud, F. and Dubrulle, B.}, title = {Robust estimate of dynamo thresholds in the von Karman sodium experiment using the extreme value theory}, journal = {New Journal of Physics}, year = {2014}, volume = {16}, pages = {083001}, doi = {10.1088/13672630/16/8/083001} } 
Abstract: We address the problem of defining earlywarning indicators of critical transitions. To this purpose, we fit the relevant time series through a class of linear models, known as autoregressive movingaverage (ARMA( p , q )) models. We define two indicators representing the total order and the total persistence of the process, linked, respectively, to the shape and to the characteristic decay time of the autocorrelation function of the process. We successfully test the method to detect transitions in a Langevin model and a 2D Ising model with nearestneighbor interaction. We then apply the method to complex systems, namely for dynamo thresholds and financial crisis detection. 
BibTeX:
@article{Faranda2014b, author = {D. Faranda and B. Dubrulle and F. M. E. Pons}, title = {Statistical earlywarning indicators based on autoregressive movingaverage models}, journal = {Journal of Physics A: Mathematical and Theoretical}, year = {2014}, volume = {47}, number = {25}, pages = {252001}, url = {http://stacks.iop.org/17518121/47/i=25/a=252001} } 

BibTeX:
@article{Faranda2014c, author = {Faranda, D. and Leoncini, X. and Vaienti, S.}, title = {Mixing properties in the advection of passive tracers via recurrences and extreme value theory}, journal = {Physical Review E}, publisher = {American Physical Society}, year = {2014}, volume = {89}, pages = {052901}, url = {http://link.aps.org/doi/10.1103/PhysRevE.89.052901}, doi = {10.1103/PhysRevE.89.052901} } 

Abstract: Abstract Extreme Value Theory (EVT) is exploited to determine the global stability threshold R g of plane Couette flow â the flow of a viscous fluid in the space between two parallel plates â whose laminar or turbulent behavior depends on the Reynolds number R. Even if the existence of a global stability threshold has been detected in simulations and experiments, its numerical value has not been unequivocally defined. R g is the value such that for R > R g , turbulence is sustained, whereas for R < R g it is transient and eventually decays. We address the problem of determining R g by using the extremes â maxima and minima â of the perturbation energy fluctuations. When R â« R g , both the positive and negative extremes are bounded. As the critical Reynolds number is approached from above, the probability of observing a very low minimum increases causing asymmetries in the distributions of maxima and minima. On the other hand, the maxima distribution is unaffected as the fluctuations towards higher values of the perturbation energy remain bounded. This tipping point can be detected by fitting the data to the Generalized Extreme Value (GEV) distribution and by identifying R g as the value of R such that the shape parameter of the GEV for the minima changes sign from negative to positive. The results are supported by the analysis of theoretical models which feature a bistable behavior. 
BibTeX:
@article{Faranda2014d, author = {D. Faranda and V. Lucarini and P. Manneville and J. Wouters}, title = {On using extreme values to detect global stability thresholds in multistable systems: The case of transitional plane Couette flow }, journal = {Chaos, Solitons & Fractals }, year = {2014}, volume = {64}, number = {0}, pages = {26  35}, note = {Nonequilibrium Statistical Mechanics: Fluctuations and Response }, url = {http://www.sciencedirect.com/science/article/pii/S0960077914000162}, doi = {10.1016/j.chaos.2014.01.008} } 

Abstract: We introduce a novel way to extract information from turbulent datasets by applying an Auto Regressive Moving Average (ARMA) statistical analysis. Such analysis goes well beyond the analysis of the mean flow and of the fluctuations and links the behavior of the recorded time series to a discrete version of a stochastic differential equation which is able to describe the correlation structure in the dataset. We introduce a new index Upsilon that measures the difference between the resulting analysis and the Obukhov model of turbulence, the simplest stochastic model reproducing both Richardson law and the Kolmogorov spectrum. We test the method on datasets measured in a von Karman swirling flow experiment. We found that the ARMA analysis is well correlated with spatial structures of the flow, and can discriminate between two different flows with comparable mean velocities, obtained by changing the forcing. Moreover, we show that the Upsilon is highest in regions where shear layer vortices are present, thereby establishing a link between deviations from the Kolmogorov model and coherent structures. These deviations are consistent with the ones observed by computing the Hurst exponents for the same time series. We show that some salient features of the analysis are preserved when considering global instead of local observables. Finally, we analyze flow configurations with multistability features where the ARMA technique is efficient in discriminating different stability branches of the system. 
BibTeX:
@article{Faranda2014e, author = {Faranda, D. and Pons, F. M. E. and Dubrulle, B. and Daviaud, F. and SaintMichel, B. and Herbert, E. and Cortet, P.P.}, title = {Modelling and analysis of turbulent datasets using Auto Regressive Moving Average processes}, journal = {Physics of Fluids}, year = {2014}, volume = {26}, number = {10}, pages = {105101 (22 pp.)105101}, doi = {10.1063/1.4896637} } 

Abstract: Abstract In this paper we prove the existence of extreme value laws for dynamical systems perturbed by the instrumentlikeerror, also called observational noise. An orbit perturbed with observational noise mimics the behavior of an instrumentally recorded time series. Instrument characteristicsâdefined as precision and accuracyâact both by truncating and randomly displacing the real value of a measured observable. Here we analyze both these effects from a theoretical and a numerical point of view. First we show that classical extreme value laws can be found for orbits of dynamical systems perturbed with observational noise. Then we present numerical experiments to support the theoretical findings and give an indication of the order of magnitude of the instrumental perturbations which cause relevant deviations from the extreme value laws observed in deterministic dynamical systems. Finally, we show that the observational noise preserves the structure of the deterministic attractor. This goes against the common assumption that random transformations cause the orbits asymptotically fill the ambient space with a loss of information about the fractal structure of the attractor. 
BibTeX:
@article{Faranda2014, author = {D. Faranda and S. Vaienti}, title = {Extreme value laws for dynamical systems under observational noise }, journal = {Physica D: Nonlinear Phenomena }, year = {2014}, volume = {280281}, number = {0}, pages = {86  94}, url = {http://www.sciencedirect.com/science/article/pii/S0167278914000906}, doi = {10.1016/j.physd.2014.04.011} } 

BibTeX:
@article{Faranda2014f, author = {Faranda, S. and Dubrulle, B. and Daviaud, F. and Pons, F. M. E.}, title = {Probing turbulence intermittency via autoregressive movingaverage models}, journal = {Physical Review E}, publisher = {American Physical Society}, year = {2014}, volume = {90}, pages = {061001}, url = {http://link.aps.org/doi/10.1103/PhysRevE.90.061001}, doi = {10.1103/PhysRevE.90.061001} } 

Abstract: We study the nonequilibrium critical behavior of the pair contact process with diffusion (PCPD) by means of nonperturbative functional renormalization group techniques. We show that usual perturbation theory fails because the effective potential develops a nonanalyticity at a finite length scale: Perturbatively forbidden terms are dynamically generated and the flow can be continued once they are taken into account. Our results suggest that the critical behavior of PCPD can be either in the directed percolation or in a different (conjugated) universality class. 
BibTeX:
@article{Gredat2014, author = {D. Gredat and H. Chate and B. Delamotte and I. Dornic}, title = {Finitescale singularity in the renormalization group flow of a reactiondiffusion system}, journal = {Physical Review E}, year = {2014}, volume = {89}, number = {1}, pages = {010102}, note = {http://arxiv.org/abs/1211.1274}, doi = {10.1103/PhysRevE.89.010102} } 

Abstract: The notion of instability of a turbulent flow is introduced in the case of a von Karman flow thanks to the monitoring of the spatiotemporal spectrum of the velocity fluctuations, combined with projection onto suitable Beltrami modes. It is shown that the large scale coherent fluctuations of the flow obey a sequence of Eckhaus instabilities when the Reynolds number Re is varied from 10(2) to 10(6). This sequence results in modulations of increasing azimuthal wavenumber. The basic state is the laminar or timeaveraged flow at an arbitrary Re, which is axisymmetric, i.e., with a 0 azimuthal wavenumber. Increasing Re leads to nonaxisymmetric modulations with increasing azimuthal wavenumber from 1 to 3. These modulations are found to rotate in the azimuthal direction. However, no clear rotation frequency can be established until Re approximate to 4 x 10(3). Above, they become periodic with an increasing frequency. We finally show that these modulations are connected with the coherent structures of the mixing shear layer. The implication of these findings for the turbulence parametrization is discussed. Especially, they may explain why simple eddy viscosity models are able to capture complex turbulent flow dynamics. (C) 2014 AIP Publishing LLC. 
BibTeX:
@article{Herbert2014, author = {Herbert, E. and Cortet, P.P. and Daviaud, F. and Dubrulle, B.}, title = {Eckhauslike instability of large scale coherent structures in a fully turbulent von Karman flow}, journal = {Physics of Fluids}, year = {2014}, volume = {26}, number = {1}, pages = {015103}, doi = {10.1063/1.4855018} } 

Abstract: This article deals with the theoretical prediction of the wetting hysteresis on nonideal solid surfaces in terms of the surface heterogeneity parameters. The spatially periodical chemical heterogeneity is considered. We propose precise definitions for both the advancing and the receding contact angles for the Wilhelmy plate geometry. It is well known that in such a system, a multitude of metastable states of the liquid meniscus occurs for each different relative position of the defect pattern on the plate with respect to the liquid level. As usual, the static advancing and receding angles are assumed to be a consequence of the preceding contact line motion in the respective direction. It is shown how to select the appropriate states among all metastable states. Their selection is discussed. The proposed definitions are applicable to both the static and the dynamic contact angles on heterogeneous surfaces. The static advancing and receding angles are calculated for two examples of periodic heterogeneity patterns with sharp borders: the horizontal alternating stripes of a different wettability (studied analytically) and the doubly periodic pattern of circular defects on a homogeneous base (studied numerically). The wetting hysteresis is determined as a function of the defect density and the spatial period. A comparison with the existing results is carried out. 
BibTeX:
@article{Iliev2014, author = {Iliev, Stanimir and Pesheva, Nina and Nikolayev, Vadim S.}, title = {Contact angle hysteresis and pinning at periodic defects in statics}, journal = {Physical Review E}, year = {2014}, volume = {90}, number = {1}, pages = {012406}, doi = {10.1103/PhysRevE.90.012406} } 

Abstract: By studying a nonlinear susceptibility on supercooled glycerol, we show that applying a static field Est increases the glass transition temperature Tg by an amount quadratic in Est. This has important consequences: (i) it reinforces the relation between the two paths put forward in the last years to unveil the dynamical correlation volume close to Tg; (ii) it clarifies the interpretation of nonlinear measurements; (iii) it yields a new control parameter of the glass transition, which paves the way for experiments deepening our understanding of glasses. 
BibTeX:
@article{LHote2014, author = {L'Hote, D. and Tourbot, R. and Ladieu, F. and Gadige, P.}, title = {Control parameter for the glass transition of glycerol evidenced by the staticfieldinduced nonlinear response}, journal = {Physical Review B}, year = {2014}, volume = {90}, number = {10}, doi = {10.1103/PhysRevB.90.104202} } 

BibTeX:
@article{Lecoutre2014, author = {C. Lecoutre and Y. Garrabos and D. Beysens and V. Nikolayev and I. Hahn}, title = {Boiling phenomena in nearcritical SF6 observed in weightlessness}, journal = {Acta Astronautica}, year = {2014}, volume = {100}, number = {0}, pages = {22  29}, url = {http://www.sciencedirect.com/science/article/pii/S0094576514001088}, doi = {10.1016/j.actaastro.2014.03.012} } 
Abstract: We present the magnetic property evolution in longrange ordered fcc supracrystals of Co nanocrystals (NCs) induced mainly by nanocrystallinity. By increasing the nanocrystalline order of individual NCs, ac susceptibility measurements indicate a significant increase in the 'interactiontoanisotropy' energy ratio, a trend favourable for the formation of SFM state in these 3D supracrystals. 
BibTeX:
@article{Lisiecki2014a, author = {Isabelle Lisiecki and Sawako Nakamae}, title = {Crystalline Order Effects on the Magnetic Properties of Superlattices made of Cobalt Nanocrystals}, journal = {Journal of Physics: Conference Series}, year = {2014}, volume = {521}, number = {1}, pages = {012007}, url = {http://stacks.iop.org/17426596/521/i=1/a=012007} } 

Abstract: In this paper we provide a connection between the geometrical properties of the attractor of a chaotic dynamical system and the distribution of extreme values. We show that the extremes of socalled physical observables are distributed according to the classical generalised Pareto distribution and derive explicit expressions for the scaling and the shape parameter. In particular, we derive that the shape parameter does not depend on the chosen observables, but only on the partial dimensions of the invariant measure on the stable, unstable, and neutral manifolds. The shape parameter is negative and is close to zero when highdimensional systems are considered. This result agrees with what was derived recently using the generalized extreme value approach. Combining the results obtained using such physical observables and the properties of the extremes of distance observables, it is possible to derive estimates of the partial dimensions of the attractor along the stable and the unstable directions of the flow. Moreover, by writing the shape parameter in terms of moments of the extremes of the considered observable and by using linear response theory, we relate the sensitivity to perturbations of the shape parameter to the sensitivity of the moments, of the partial dimensions, and of the KaplanYorke dimension of the attractor. Preliminary numerical investigations provide encouraging results on the applicability of the theory presented here. The results presented here do not apply for all combinations of Axiom A systems and observables, but the breakdown seems to be related to very special geometrical configurations. 
BibTeX:
@article{Lucarini2014, author = {Lucarini, Valerio and Faranda, Davide and Wouters, Jeroen and Kuna, Tobias}, title = {Towards a General Theory of Extremes for Observables of Chaotic Dynamical Systems}, journal = {Journal of Statistical Physics}, year = {2014}, volume = {154}, number = {3}, pages = {723750}, doi = {10.1007/s1095501309146} } 

Abstract: The asymmetric simple exclusion process (ASEP) has become a paradigmatic toymodel of a nonequilibrium system, and much effort has been made in the past decades to compute exactly its statistics for given dynamical rules. Here, a different approach is developed; analogously to the equilibrium situation, we consider that the dynamical rules are not exactly known. Allowing for the transition rate to vary, we show that the dynamical rules that maximize the entropy production and those that maximise the rate of variation of the dynamical entropy, known as the KolmogorovSinai entropy coincide with good accuracy. We study the dependence of this agreement on the size of the system and the couplings with the reservoirs, for the original ASEP and a variant with Langmuir kinetics. 
BibTeX:
@article{Mihelich2014, author = {Mihelich, Martin and Dubrulle, Berengere and Paillard, Didier and Herbert, Corentin}, title = {Maximum Entropy Production vs. KolmogorovSinai Entropy in a Constrained ASEP Model}, journal = {Entropy}, year = {2014}, volume = {16}, number = {2}, pages = {10371046}, doi = {10.3390/e16021037} } 

Abstract: Hydrodynamic and magnetic behaviors in a modified experimental setup of the von Karman sodium flowwhere one disk has been replaced by a propellerare investigated. When the rotation frequencies of the disk and the propeller are different, we show that the fully turbulent hydrodynamic flow undergoes a global bifurcation between two configurations. The bistability of these flow configurations is associated with the dynamics of the central shear layer. The bistable flows are shown to have different dynamo efficiencies; thus for a given rotation rate of the softiron disk, two distinct magnetic behaviors are observed depending on the flow configuration. The hydrodynamic transition controls the magnetic field behavior, and bifurcations between high and low magnetic field branches are investigated. 
BibTeX:
@article{Miralles2014, author = {Miralles, Sophie and Herault, Johann and Fauve, Stephan and Gissinger, Christophe and Petrelis, Francois and Daviaud, Francois and Dubrulle, Berengere and Boisson, Jean and Bourgoin, Mickael and Verhille, Gautier and Odier, Philippe and Pinton, JeanFrancois and Plihon, Nicolas}, title = {Dynamo efficiency controlled by hydrodynamic bistability}, journal = {Physical Review E}, year = {2014}, volume = {89}, number = {6}, pages = {063023}, doi = {10.1103/PhysRevE.89.063023} } 

Abstract: Interacting magnetic nanoparticles display a wide variety of magnetic behaviors ranging from modified superparamagnetism, superspin glass to possibly, superferromagnetism. The superspin glass state is described by its slow and outofequilibrium magnetic behaviors akin to those found in atomic spin glasses. In this article, recent experimental findings on superspin correlation length growth and the violation of the fluctuationdissipation theorem obtained in concentrated frozen ferrofluids are presented to illustrate certain outofequilibrium dynamics behavior in superspin glasses. (C) 2013 Elsevier B.V. All rights reserved. 
BibTeX:
@article{Nakamae2014, author = {Nakamae, S.}, title = {Outofequilibrium dynamics in superspin glass state of strongly interacting magnetic nanoparticle assemblies}, journal = {Journal of Magnetism and Magnetic Materials}, year = {2014}, volume = {355}, pages = {225229}, doi = {10.1016/j.jmmm.2013.12.018} } 

Abstract: Interacting magnetic nanoparticles display a wide variety of magnetic behaviors ranging from modified superparamagnetism, superspin glass to possibly, superferromagnetism. The superspin glass state is described by its slow and outofequilibrium magnetic behaviors akin to those found in atomic spin glasses. In this article, recent experimental findings on superspin correlation length growth and the violation of the fluctuationdissipation theorem obtained in concentrated frozen ferrofluids are presented to illustrate certain outofequilibrium dynamics behavior in superspin glasses. (C) 2014 Published by Elsevier B.V. 
BibTeX:
@article{Nakamae2014a, author = {Nakamae, S}, title = {Reprint of: Outofequilibrium dynamics in superspin glass state of strongly interacting magnetic nanoparticle assemblies}, journal = {Journal of Magnetism and Magnetic Materials}, year = {2014}, volume = {368}, pages = {438442}, doi = {10.1016/j.jmmm.2014.05.045} } 

Abstract: We show that dry active nematics, e.g., collections of shaken elongated granular particles, exhibit largescale spatiotemporal chaos made of interacting dense, ordered, bandlike structures in a parameter region including the linear onset of nematic order. These results are obtained from the study of both the wellknown (deterministic) hydrodynamic equations describing these systems and of the selfpropelled particle model they were derived from. We prove, in particular, that the chaos stems from the generic instability of the band solution of the hydrodynamic equations. Revisiting the status of the strong fluctuations and longrange correlations in the particle model, we show that the giant number fluctuations observed in the chaotic phase are a trivial consequence of density segregation. However anomalous, curvaturedriven number fluctuations are present in the homogeneous quasiordered nematic phase and characterized by a nontrivial scaling exponent. 
BibTeX:
@article{Ngo2014, author = {Ngo, S. and Peshkov, A. and Aranson, I. S. and Bertin, E. and Ginelli, F. and Chate, H.}, title = {LargeScale Chaos and Fluctuations in Active Nematics}, journal = {Physical Review Letters}, year = {2014}, volume = {113}, number = {3}, pages = {038302}, doi = {10.1103/PhysRevLett.113.038302} } 

Abstract: We describe a generic theoretical framework, denoted as the BoltzmannGinzburgLandau approach, to derive continuous equations for the polar and/or nematic order parameters describing the large scale behavior of assemblies of pointlike active particles interacting through polar or nematic alignment rules. Our study encompasses three main classes of dry active systems, namely polar particles with 'ferromagnetic' alignment (like the original Vicsek model), nematic particles with nematic alignment ("active nematics"), and polar particles with nematic alignment ("selfpropelled rods"). The BoltzmannGinzburgLandau approach combines a lowdensity description in the form of a Boltzmann equation, with a GinzburgLandautype expansion close to the instability threshold of the disordered state. We provide the generic form of the continuous equations obtained for each class, and comment on the relationships and differences with other approaches. 
BibTeX:
@article{Peshkov2014, author = {Peshkov, A. and Bertin, E. and Ginelli, F. and Chate, H.}, title = {BoltzmannGinzburgLandau approach for continuous descriptions of generic Vicseklike models}, journal = {European Physical Journalspecial Topics}, year = {2014}, volume = {223}, number = {7}, pages = {13151344}, doi = {10.1140/epjst/e201402193y} } 

Abstract: We consider homogeneous shearstratified turbulence in a rotating frame, that exhibits complex nonlinear dynamics. Since the analysis of relative orientation between coupled fluctuating fields helps us to understand turbulence dynamics, we focus on the alignment properties of both the velocity and gravity fields with the potential vorticity gradient. With the help of statistical mechanics, we define a vector field which plays a role in the analogous socalled crosshelicity in magnetohydrodynamics. Highresolution direct numerical simulations of developed homogeneous baroclinic turbulence are performed, and a detailed analysis of probability density functions for crosshelicity is provided. A net preference for positive crosshelicity is shown to be related to a new alignment mechanism. We argue that the analysis of crosshelicity is crucial for understanding the dynamics of buoyancy driven flows. 
BibTeX:
@article{Pieri2014, author = {Pieri, A. B. and Godeferd, F. S. and Cambon, C. and Dubrulle, B. and Thalabard, S.}, title = {Crosshelicity in Rotating Homogeneous ShearStratified Turbulence}, journal = {Physical Review Letters}, year = {2014}, volume = {112}, number = {11}, doi = {10.1103/PhysRevLett.112.114501} } 

BibTeX:
@patent{Rountree2014, author = {Cindy Rountree and Daniel Bonamy}, title = {Method for measuring the tenacity of a material}, year = {2014}, number = {WO 2014023729 A1} } 

BibTeX:
@article{Rousset2014, author = {B. Rousset and P. Bonnay and P. Diribarne and A. Girard and J. M. Poncet and E. Herbert and J. Salort and C. Baudet and B. Castaing and L. Chevillard and F. Daviaud and B. Dubrulle and Y. Gagne and M. Gibert and B. Hébral and Th. Lehner and P.E. Roche and B. SaintMichel and M. Bon Mardion}, title = {Superfluid high Reynolds von Kármán experiment}, journal = {Review of Scientific Instruments}, year = {2014}, volume = {85}, pages = {103908}, doi = {10.1063/1.4897542} } 

Abstract: We suggest that the dynamical spontaneous symmetry breaking reported in a turbulent swirling flow at Re = 40 000 by Cortet et al (2010 Phys. Rev. Lett. 105 214501) can be described through a continuous one parameter family transformation (amounting to a phase shift) of steady states. We investigate a possible mechanism of emergence of such spontaneous symmetry breaking in a toy model of outofequilibrium systems. We show that the stationary states are solutions of a linear differential equation. For a specific value of the Reynolds number, they are subject to a spontaneous symmetry breaking through a zeromode mechanism. The associated susceptibility diverges at the transition, in a way similar to what is observed in the experimental turbulent flow. Overall, the susceptibility of the toy model reproduces the features of the experimental results, meaning that the zeromode mechanism is a good candidate to explain the experimental symmetry breaking. 
BibTeX:
@article{SaintMichel2014, author = {SaintMichel, B. and Daviaud, F. and Dubrulle, B.}, title = {A zeromode mechanism for spontaneous symmetry breaking in a turbulent von Karman flow}, journal = {New Journal of Physics}, year = {2014}, volume = {16}, pages = {013055}, doi = {10.1088/13672630/16/1/013055} } 

Abstract: We study dry active nematics at the kinetic equation level, stressing the differences with the wellknown Doi theory for nonactive rods near thermal equilibrium. By deriving hydrodynamic equations from the kinetic equation, we show analytically that these two description levels share the same qualitative phase diagram, as defined by the linear instability limits of spatiallyhomogeneous solutions. In particular, we show that the ordered, homogeneous state is unstable in a region bordering the linear onset of nematic order, and is only linearly stable deeper in the ordered phase. Direct simulations of the kinetic equation reveal that its solutions are chaotic in the region of linear instability of the ordered homogeneous state. The local mechanisms for this largescale chaos are discussed. 
BibTeX:
@article{Shi2014, author = {Shi, X.Q. and Chate, H. and Ma, Y.Q.}, title = {Instabilities and chaos in a kinetic equation for active nematics}, journal = {New Journal of Physics}, year = {2014}, volume = {16}, pages = {035003}, doi = {10.1088/13672630/16/3/035003} } 

Abstract: We present a detailed study of a global bifurcation occuring in a turbulent von Karman swirling flow. In this system, the statistically steady states progressively display hysteretic behaviour when the Reynolds number is increased above the transition to turbulence. We examine in detail this hysteresis using asymmetric forcing conditionsrotating the impellers at different speeds. For very high Reynolds numbers, we study the sensitivity of the hysteresis cycleusing complementary particle image velocimetry and global mechanical measurementsto the forcing nature, imposing either the torque or the speed of the impellers. New mean states, displaying multiple quasisteady states and negative differential responses, are experimentally observed in torque control. A simple analogy with electrical circuits is performed to understand the link between multistability and negative responses. The system is compared to other, similar 'bulk' systems, to understand some relevant ingredients of negative differential responses, and studied in the framework of thermodynamics of longrange interacting systems. The experimental results are eventually compared to the related problem of RayleighBenard turbulence. 
BibTeX:
@article{StMichel2014, author = {StMichel, B. and Dubrulle, B. and Marie, L. and Ravelet, F. and Daviaud, F.}, title = {Influence of Reynolds number and forcing type in a turbulent von Karman flow}, journal = {New Journal of Physics}, year = {2014}, volume = {16}, pages = {063037}, doi = {10.1088/13672630/16/6/063037} } 

Abstract: In the present paper, microcanonical measures for the dynamics of three dimensional (3D) axially symmetric turbulent flows with Swirl in a TaylorCouette geometry are defined, using an analogy with a long range lattice model. We compute the relevant physical quantities and argue that two kinds of equilibrium regime exist, depending on the value of the total kinetic energy. For low energies, the equilibrium flow consists of a purely swirling flow whose toroidal profile depends on the radial coordinate only. For high energies. the typical toroidal field is uniform, While the typical poloidal field is organized into either a single vertical jet or a large scale dipole, and exhibits infinite fluctuations. This unusual phase diagram comes from the poloidal fluctuations not being bounded for the axisymmetric Euler dynamics. even though the latter conserve infinitely many `Casimir invariants'. This shows that 3D axially symmetric flows can be considered as intermediate between 2D and 3D flows. 
BibTeX:
@article{Thalabard2014, author = {Thalabard, S. and Dubrulle, B. and Bouchet, F.}, title = {Statistical mechanics of the 3D axisymmetric Euler equations in a TaylorCouette geometry}, journal = {Journal of Statistical Mechanics: Theory and Experiment}, year = {2014}, doi = {10.1088/17425468/2014/01/P01005} } 

Abstract: The thiolate/disulfide organic redox couple (McMT () /BMT), derived from 2mercapto5methyl1,3,4thiadiazole (McMT), recently proposed as an alternative to usual inorganic couples in dyesensitized solar cells, exhibits a remarkable reversibility and stability in a thermogalvanic cell containing a 1ethyl3methyimidazolium tetrafluoroborate/acetonitrile (EMIMBF4/AN) mixture. The thermoelectric power depends strongly on concentrations of both the ionic liquid and the redox couple. It is enhanced by a factor of six at high ionicliquid concentrations. The control of these parameters can be used to enhance the thermopower and the thermoelectric efficiency of future ionicliquid thermocells. 
BibTeX:
@article{Zinovyeva2014, author = {Zinovyeva, V. and Nakamae, S. and Bonetti, M. and Roger, M.}, title = {Enhanced Thermoelectric Power in Ionic Liquids}, journal = {Chemelectrochem}, year = {2014}, volume = {1}, number = {2}, pages = {426430}, doi = {10.1002/celc.201300074} } 
Maj : 07/02/2017 (2443)