Física de la Matèria Condensada: Envíos recientes
Mostrando ítems 61-80 de 1288
Onsager symmetry principle for a particle moving through a fluid not in equilibrium
We have shown that the mobility tensor for a particle moving through an arbitrary homogeneous stationary flow satisfies generalized Onsager symmetry relations in which the time-reversal transformation should also be applied ...
Pure Lovelock Kasner metrics
We study pure Lovelock vacuum and perfect fluid equations for Kasner-type metrics. These equations correspond to a single Nth order Lovelock term in the action in $d=2N+1,2N+2$ dimensions, and they capture the relevant ...
Bistability driven by dichotomous noise
We consider mean-first-passage times and transition rates in bistable systems driven by dichotomous colored noise. We carry out an asymptotic expansion for short correlation times ¿c of the colored noise and find results ...
Editorial: The Science of Citizen Science Evolves
Podeu consultar el llibre complet a: http://hdl.handle.net/2445/173349
Landscape-Inversion Phase Transition in Dipolar Colloids: Tuning the Structure and Dynamics of 2D Crystals
We study the 2D crystalline phases of paramagnetic colloidal particles with dipolar interactions and constrained on a periodic substrate. Combining theory, simulation, and experiments, we demonstrate a new scenario of ...
Auxin influx carriers control vascular patterning and xylem differentiation in Arabidopsis thaliana
Auxin is an essential hormone for plant growth and development. Auxin influx carriers AUX1/LAX transport auxin into the cell, while auxin efflux carriers PIN pump it out of the cell. It is well established that efflux ...
Accounting for adsorption and desorption in Lattice Boltzmann simulations
We report a Lattice-Boltzmann scheme that accounts for adsorption and desorption in the calculation of mesoscale dynamical properties of tracers in media of arbitrary complexity. Lattice Boltzmann simulations made it ...
Hydra Molecular Network Reaches Criticality at the Symmetry-Breaking Axis-Defining Moment
We study biological, multicellular symmetry breaking on a hollow cell sphere as it occurs during hydra regeneration from a random cell aggregate. We show that even a weak temperature gradient directs the axis of the ...
Reversible adiabatic temperature changes at the magnetocaloric and barocaloric effects in Fe49Rh51
We report on the adiabatic temperature changes (DT) associated with the magnetocaloric and barocaloric effects in a Fe49Rh51 alloy. For the magnetocaloric effect, data derived from entropy curves are compared to direct ...
Collective directional locking of colloidal monolayers on a periodic substrate
We investigate the directional locking effects that arise when a monolayer of paramagnetic colloidal particles is driven across a triangular lattice of magnetic bubbles. We use an external rotating magnetic field to generate ...
Low-resistance spin-dependent tunnel junctions with HfAlOx barriers for high-density recording-head application
Spin-dependent tunnel junctions with the structure (Ta 70 /spl Aring//NiFe 70 /spl Aring//MnIr 80 /spl Aring//CoFe 35 /spl Aring//HfAlO/sub x//CoFe 35 /spl Aring//NiFe 40 /spl Aring//TiW(N) 150 /spl Aring/) were fabricated ...
Bistability driven by dichotomous noise: A comment
Two recently reported treatments [J. M. Porrà et al., Phys. Rev. A 44, 4866 (1991) and I. L¿Heureux and R. Kapral, J. Chem. Phys. 88, 7468 (1988)] of the problem of bistability driven by dichotomous colored noise with a ...
Three-dimensional telegrapher's equation and its fractional generalization
We derive the three-dimensional telegrapher's equation out of a random walk model. The model is a threedimensional version of the multistate random walk where the number of different states form a continuum representing ...
Intramolecular coupling as a mechanism for a liquid-liquid phase transition
We study a model for water with a tunable intramolecular interaction Js, using mean-field theory and off-lattice Monte Carlo simulations. For all Js>~0, the model displays a temperature of maximum density. For a finite ...
Nonperturbative semiclassical stability of de Sitter spacetime for small metric deviations
We consider the linearized semiclassical Einstein equations for small deviations around de Sitter spacetime including the vacuum polarization effects of conformal fields. Employing the method of order reduction, we find ...
Lateral-drag propulsion forces induced by anisotropy
We predict the existence of lateral drag forces near the flat surface of an absorbing slab made of an anisotropic material. The forces originate from the fluctuations of the electromagnetic field, when the anisotropy axis ...
What can we learn about gravitational wave physics with an elastic spherial antenna?
A general formalism is set up to analyze the response of an arbitrary solid elastic body to an arbitrary metric gravitational wave (GW) perturbation, which fully displays the details of the interaction antenna wave. The ...
Multiphase magnetic deflagrations in a Nd5Ge3 single crystal
We report magnetic deflagration phenomena ocurring in both antiferromagnetic and ferromagnetic phases in a single crystal of the intermetallic compound Nd5Ge3. We have investigated, using a trigger heat pulse, the spatial ...
Percolation analysis of force networks in anisotropic granular matter
We study the percolation properties of force networks in an anisotropic model for granular packings, the so-called q-model. Following the original recipe of Ostojic et al (2006 Nature 439 828), we consider a percolation ...
Evidence of the anomalous charge state 57Fe4+ in the nuclear decay of 57Co3+
The first observation of the elusive Fe4+ charge state coming from the nuclear decay of 57Co3+ has been found in the Mössbauer emission spectra of 57Co:La2Li0.5Co0.5O4. A Ti-doped sample was prepared in order to show that ...
