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*epl* draft Localization by entanglement

, 705

"... PACS 05.45.-a – Nonlinear dynamics and chaos PACS 11.15.Kc – General theory of fields and particles – Classical and semiclassical techniques Abstract.- We study the localization of bosonic atoms in an optical lattice, which interact in a spatially confined region. The classical theory predicts that ..."

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further show, using an explicit solution of the two-particle bound state and an appropriate measure of entanglement, that the entanglement tends to a

*finite*value in the limit of weak interactions. Coupled with the non-existence of localization in an optimized quantum product state, we conclude###
*epl* draft Generation of *finite* wave trains in excitable media

, 807

"... PACS 47.54.-r – Pattern selection, pattern formation Abstract.- Spatiotemporal control of excitable media is of paramount importance in the development of new applications, ranging from biology to physics. To this end we identify and describe a qualitative property of excitable media that enables us ..."

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us to generate a sequence of traveling pulses of any desired length, using a one-time initial stimulus. The wave trains are produced by a transient pacemaker generated by a one-time suitably tailored spatially localized

*finite*amplitude stimulus, and belong to a family of fast pulse trains. A second###
*epl* draft Molecular kinetic analysis of a *finite*-time Carnot cycle

, 802

"... Abstract.- We study the efficiency at the maximal power ηmax of a finite-time Carnot cycle of a weakly interacting gas which we can regard as a nearly ideal gas. In several systems interacting with the hot and cold reservoirs of the temperatures Th and Tc, respectively, it is known that ηmax = 1 − ..."

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Abstract.- We study the efficiency at the maximal power ηmax of a

*finite*-time Carnot cycle of a weakly interacting gas which we can regard as a nearly ideal gas. In several systems interacting with the hot and cold reservoirs of the temperatures Th and Tc, respectively, it is known that ηmax = 1###
*epl* draft Stretching helical nano-springs at *finite* temperature

, 803

"... PACS 87.15.-v – Biomolecules; structure and physical properties PACS 62.25.+g – Mechanical properties of nanoscale materials PACS 82.37.Gk – STM and AFM manipulations of a single molecule Abstract.- Using dynamic simulations and analytic methods, we study the elastic response of a helical filament s ..."

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PACS 87.15.-v – Biomolecules; structure and physical properties PACS 62.25.+g – Mechanical properties of nanoscale materials PACS 82.37.Gk – STM and AFM manipulations of a single molecule Abstract.- Using dynamic simulations and analytic methods, we study the elastic response of a helical filament subject to uniaxial tension over a wide range of bend and twist persistence length. A low-pitch helix at low temperatures exhibits a stretching instability and the force-extension curve consists of a sequence of spikes. At elevated temperature (i.e. small persistence lengths) the helix melts and a pronounced force plateau is obtained in the fixed-extension ensemble. The torque boundary condition significantly affects the resulting elastic properties. The elasticity of flexible filaments has been the subject of intense research efforts, responding to the growing need to understand mechanical and thermodynamic properties of biopolymers such as DNA or filamentous proteins [1]. Various theoretical approaches, ranging from linear elasticity theory [2] to quantum-chemical modelling [3],

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*epl* draft Wave Resistance for Capillary Gravity Waves: *Finite* Size Effects

"... PACS 68.03.-g – Gas-liquid and vacuum-liquid interfaces Abstract.- We study theoretically the capillary-gravity waves created at the water-air interface by an external surface pressure distribution symmetrical about a point and moving at constant velocity along a linear trajectory. Within the framew ..."

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PACS 68.03.-g – Gas-liquid and vacuum-liquid interfaces Abstract.- We study theoretically the capillary-gravity waves created at the water-air interface by an external surface pressure distribution symmetrical about a point and moving at constant velocity along a linear trajectory. Within the framework of linear wave theory and assuming the fluid to be inviscid, we calculate the wave resistance experienced by the perturbation as a function of its size (compared to the capillary length). In particular, we analyze how the amplitude of the jump occurring at the minimum phase speed cmin = (4gγ/ρ) 1/4 depends on the size of the pressure distribution (ρ is the liquid density, γ is the water-air surface tension, and g is the acceleration due to gravity). We also show how for pressure distributions broader than a few capillary lengths, the result obtained by Havelock for the wave resistance in the particular case of pure gravity waves (i.e., γ = 0) is progressively recovered. Introduction. – Water waves are both captivating and of great practical significance [1–3]. They have thus attracted the attention of scientists and engineers for many

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*epl* draft Kinetics of the helix-coil transition

, 905

"... Abstract.- Based on the Zimm-Bragg model we study cooperative helix-coil transition driven by a finite-speed change of temperature. There is an asymmetry between the coil→helix and helix→coil transition: the latter is displayed already for finite speeds, and takes shorter time than the former. This ..."

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Abstract.- Based on the Zimm-Bragg model we study cooperative helix-coil transition driven by a

*finite*-speed change of temperature. There is an asymmetry between the coil→helix and helix→coil transition: the latter is displayed already for*finite*speeds, and takes shorter time than the former###
*epl* draft Parameters of the fractional Fokker-Planck equation

, 811

"... PACS 05.40.Fb – Random walks and Levy flights Abstract.- We study the connection between the parameters of the fractional Fokker-Planck equation, which is associated with the overdamped Langevin equation driven by noise with heavytailed increments, and the transition probability density of the noise ..."

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of the noise generating process. Explicit expressions for these parameters are derived both for

*finite*and infinite variance of the rescaled transition probability density. Introduction. – Heavy-tailed distributions, i.e., probability distributions with power tails and infinite second moments, are an important###
*epl* draft Nonionic and ionic surfactants at an interface

, 805

"... Abstract.- A Ginzburg-Landau theory is presented on surfactants in polar binary mixtures, which aggregate at an interface due to the amphiphilic interaction. They can be ionic surfactants coexisting with counterions. Including the solvation and image interactions and accounting for a finite volume f ..."

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Abstract.- A Ginzburg-Landau theory is presented on surfactants in polar binary mixtures, which aggregate at an interface due to the amphiphilic interaction. They can be ionic surfactants coexisting with counterions. Including the solvation and image interactions and accounting for a

*finite*volume###
*epl* draft Density Functional approach to Nonlinear Rheology

"... PACS 05.20.Jj – Statistical mechanics of classical fluids Abstract – We present a density functional based closure of the pair Smoluchowski equation for Brownian particles under shear flow. Given an equilibrium free energy functional as input the theory provides first-principles predictions for the ..."

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steady and start-up shear. Introduction. – The addition of colloidal particles to a Newtonian liquid gives rise to a nonlinear rheological re-sponse, characterized by a rate dependent viscosity,

*finite*normal stress differences and nontrivial transient dynam-ics [1]. Understanding the interplay between###
*epl* draft Unjamming a granular hopper by vibration

, 907

"... Abstract.- We present an experimental study of the outflow of a hopper continuously vibrated by a piezoelectric device. Outpouring of grains can be achieved for apertures much below the usual jamming limit observed for non vibrated hoppers. Granular flow persists down to the physical limit of one gr ..."

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grain diameter, a limit reached for a

*finite*vibration amplitude. For the smaller orifices, we observe an intermittent regime characterized by alternated periods of flow and blockage. Vibrations do not significantly modify the flow rates both in the continuous and the intermittent regime. The analysis