We investigate the three-dimensional evolution of shock impact on a membraneless gas bubble. When a shock wave impacts a gas interface, gas layer is generally perturbed via the Richtmyer-Meshkov instability. We show the vortex structure evolves from the merging process of the extending spikes on the...

[Phys. Rev. E 87, 051002] Published Fri May 17, 2013

The local density of states or its Fourier transform, usually called fidelity amplitude, are important measures of quantum irreversibility due to imperfect evolution. In this Rapid Communication we study both quantities in a paradigmatic many body system, the Dicke Hamiltonian, where a single-mode b...

[Phys. Rev. E 87, 050902] Published Fri May 17, 2013

Rotational movement of isolated single cilia in mice embryo was investigated, which generates leftward fluid flow in the node cavity and plays an important role in left-right determination. The leftward unidirectional flow results from tilting of the rotational axis of the cilium to the posterior si...

[Phys. Rev. E 87, 050701] Published Wed May 15, 2013

We report the observation of a doubly periodic surface defect pattern in the liquid crystal 8CB, formed during the nematic–smectic-A phase transition. The pattern results from the antagonistic alignment of the 8CB molecules, which is homeotropic at the surface and planar in the bulk of the sample ce...

[Phys. Rev. E 87, 050501] Published Wed May 15, 2013

The efficiency of microscopic heat engines in a thermally heterogenous environment is considered. We show that—as a consequence of the recently discovered entropic anomaly—quasistatic engines, whose efficiency is maximal in a fluid at uniform temperature, have in fact vanishing efficiency in the pre...

[Phys. Rev. E 87, 050102] Published Mon May 13, 2013

By combining total internal reflection fluorescence cross-correlation spectroscopy with Brownian dynamics simulations, we were able to measure the hydrodynamic boundary condition of water flowing over a smooth solid surface with exceptional accuracy. We analyzed the flow of aqueous electrolytes over...

[Phys. Rev. E 87, 051001] Published Fri May 10, 2013

Detecting unstable periodic orbits (UPOs) in chaotic systems based solely on time series is a fundamental but extremely challenging problem in nonlinear dynamics. Previous approaches were applicable but mostly for low-dimensional chaotic systems. We develop a framework, integrating approximation the...

[Phys. Rev. E 87, 050901] Published Fri May 10, 2013

We show that distinct topological phases of the band structure of a non-Hermitian Hamiltonian can be classified with elements of the braid group. As the proof of principle, we consider the non-Hermitian evolution of the statistics of nonequilibrium stochastic currents. We show that topologically non...

[Phys. Rev. E 87, 050101] Published Fri May 10, 2013

Neither a purely deterministic rotary nanomotor nor a purely orientational diffuser exhibits long-term translational motion, but coupling rotation to orientational diffusion yields translational diffusion. We demonstrate that this effective translational diffusion can easily dominate the ordinary th...

[Phys. Rev. E 87, 050301] Published Wed May 08, 2013

We describe a high-speed physical random number generator based on a hybrid Boolean network with autonomous and clocked logic gates, realized on a reconfigurable chip. The autonomous logic gates are arranged in a bidirectional ring topology and generate broadband chaos. The clocked logic gates recei...

[Phys. Rev. E 87, 040902] Published Thu Apr 25, 2013

The Hilbert-Huang transform is applied to analyze single-particle Lagrangian velocity data from numerical simulations of hydrodynamic turbulence. The velocity trajectory is described in terms of a set of intrinsic mode functions C_i(t) and of their instantaneous frequency ω_i(t). On the basis of this ...

[Phys. Rev. E 87, 041003] Published Mon Apr 22, 2013

The dynamical regimes of models belonging to the Kardar-Parisi-Zhang (KPZ) universality class are investigated in d=2+1 by extensive simulations considering flat and curved geometries. Geometry-dependent universal distributions, different from their Tracy-Widom counterpart in one dimension, were fou...

[Phys. Rev. E 87, 040102] Published Mon Apr 22, 2013

The effect of Coulomb friction is studied in the framework of collisional ratchets. It turns out that the average drift of these devices can be expressed as the combination of a term related to the lack of equipartition between the probe and the surrounding bath, and a term featuring the average fri...

[Phys. Rev. E 87, 040101] Published Mon Apr 22, 2013

We outline a possibility of hyperbolic chaotic dynamics associated with the expanding circle map for spatial phases of parametrically excited standing wave patterns. The model system is governed by a one-dimensional wave equation with nonlinear dissipation. The phenomenon arises due to the pump modu...

[Phys. Rev. E 87, 040901] Published Fri Apr 19, 2013

In the thin-double-layer limit κa≫1, electrokinetic flows about free surfaces are driven by a combination of an electro-osmotic slip and effective shear-stress jump. An intriguing case is that of a highly conducting liquid drop of radius a, where the inability to balance the viscous shear by Maxwell...

[Phys. Rev. E 87, 041002] Published Thu Apr 18, 2013

One of the most noticeable collective motion of noncohesive granular matter is clustering under certain conditions. In particular, when a quasi-two-dimensional monolayer of monodispersed noncohesive particles is vertically vibrated, a solid-liquid-like transition occurs when the driving amplitude ex...

[Phys. Rev. E 87, 040202] Published Thu Apr 18, 2013

In this experimental and numerical study, we consider the role of inertial waves in the inverse energy cascade and the transfer of momentum in a rotating fluid. An oscillating torus generates two inertial-wave cones with their energy focusing at their apex. For high wave amplitudes, turbulence is ge...

[Phys. Rev. E 87, 041001] Published Tue Apr 16, 2013

We analyze the anomalous dynamics of a tagged monomer under external navigation. The memory effect causing the anomaly is elucidated, which depends on the magnitude of the force. In particular, the nonlinear and nonequilibrium memory effect under strong force is characterized by the force-dependent ...

[Phys. Rev. E 87, 040601] Published Wed Apr 10, 2013

The directed polymerization of actin networks is an essential element of many biological processes, including cell migration. Different theoretical models considering the interplay between the underlying processes of polymerization, capping, and branching have resulted in conflicting predictions. On...

[Phys. Rev. E 87, 040701] Published Wed Apr 03, 2013

The twist-bend nematic, an enantiomorphic liquid-crystalline phase, exhibited by the structurally symmetric liquid-crystal dimer CB7CB is induced to form a single domain of uniform handedness, in the bulk, by the addition of the dopant chiral solute (S)-1-phenylethanol. Addition of a nonracemic (or ...

[Phys. Rev. E 87, 040501] Published Wed Apr 03, 2013

We investigate the motion of a two-dimensional wedge-shaped object (a granular Brownian motor), which is restricted to move along the x axis and cannot rotate as gas particles collide with it. We show that its steady-state drift, resulting from inelastic gas-motor collisions, is dramatically affecte...

[Phys. Rev. E 87, 040201] Published Wed Apr 03, 2013

We report the measurements of active and passive viscosities of a bent-core nematic liquid crystal. The active viscosity is measured using a rheometer and the passive viscosities are measured by measuring the self-diffusion coefficient of a microsphere in the aligned sample. The effective active vis...

[Phys. Rev. E 87, 030501] Published Fri Mar 29, 2013

The Lévy walk model is a stochastic framework of enhanced diffusion with many applications in physics and biology. Here we investigate the time-averaged mean squared displacement δ²̅ often used to analyze single particle tracking experiments. The ballistic phase of the motion is nonergodic a...

[Phys. Rev. E 87, 030104] Published Fri Mar 29, 2013

We analyze a class of estimators of the generalized diffusion coefficient for fractional Brownian motion B_t of known Hurst index H, based on weighted functionals of the single-time square displacement. We show that for a certain choice of the weight function these functionals possess an ergodic prop...

[Phys. Rev. E 87, 030103] Published Fri Mar 29, 2013

We study the role of delay in phase synchronization and phenomena responsible for cluster formation in delayed coupled maps on various networks. Using numerical simulations, we demonstrate that the presence of delay may change the mechanism of the unit to unit interaction. At weak coupling values, t...

[Phys. Rev. E 87, 030902] Published Mon Mar 25, 2013

We present analytic expressions for the amplitude of perturbations at the interface of two viscous fluids or two metals subjected to a shock. We derive a scaling law by collapsing this eight-parameter problem into two (three) nondimensional variables in the linear (nonlinear) regime. We propose a co...

[Phys. Rev. E 87, 031003] Published Fri Mar 22, 2013

Period variability, quantified by the standard deviation (SD) of the cycle-to-cycle period, is investigated for noisy phase oscillators. We define the checkpoint phase as the beginning or end point of one oscillation cycle and derive an expression for the SD as a function of this phase. We find that...

[Phys. Rev. E 87, 030901] Published Fri Mar 15, 2013

Nucleation of ⁴He crystals from the metastable superfluid in high porosity silica aerogel was investigated by an optical measurement. Critical overpressures at which the first ⁴He crystal appeared during pressurization were measured 50 times at each temperature. Contrary to the intuitive pore-size-l...

[Phys. Rev. E 87, 030401] Published Fri Mar 15, 2013

We investigate the effects of the timescale of motion on the shape of energy landscapes. The distinction between the free-energy landscape and the potential of mean force is clarified. The former is related to a thermal equilibrium distribution for chosen coordinates, whereas the latter is determine...

[Phys. Rev. E 87, 030803] Published Thu Mar 14, 2013

In the presence of wave dissipation, phase-space structures emerge in nonlinear Vlasov dynamics. Our theory gives a simple relation between the growth of these coherent structures and that of the wave energy. The structures can drive the wave by direct momentum exchange, which explains the existence...

[Phys. Rev. E 87, 031101] Published Tue Mar 12, 2013