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Quantitative comparison of mean field mixing laws for conductivity and dielectric constants of porous media

Widjajakusuma, J.; Biswal, B.; Hilfer, R. - In: Physica A: Statistical Mechanics and its Applications 318 (2003) 3, pp. 319-333

Exact numerical solution of the electrostatic disordered potential problem is carried out for four fully discretized three-dimensional experimental reconstructions of sedimentary rocks. The measured effective macroscopic dielectric constants and electrical conductivities are compared with...

Persistent link: https://www.econbiz.de/10010873735

Effect of shape anisotropy on transport in a two-dimensional computational model: numerical simulations showing experimental features observed in biomembranes

Pradhan, Gauri R; Pandit, Sagar A; Gangal, Anil D; … - In: Physica A: Statistical Mechanics and its Applications 270 (1999) 1, pp. 288-294

We propose a 2-d computational model system comprising a mixture of spheres and the objects of some other shapes, interacting via the Lennard–Jones potential. We propose a reliable and efficient numerical algorithm to obtain void statistics. The void distribution, in turn, determines the...

Persistent link: https://www.econbiz.de/10010874522

Transport and diffusion in overdamped ratchets as a synchronization problem

Zarlenga, D.G.; Larrondo, H.A.; Arizmendi, C.M.; … - In: Physica A: Statistical Mechanics and its Applications 352 (2005) 2, pp. 282-294

The forced and overdamped motion of non-interacting particles in a periodic asymmetric potential is studied. The analysis is focused on synchronization of the motion of the particles with the external sinusoidal driving force. Two cases are considered: a perfect lattice without disorder and a...

Persistent link: https://www.econbiz.de/10010871669

Transport between a drifting and a non-drifting gas near the edge of a separating wall

Mohazzabi, Pirooz; Bernhardt, Mark D. - In: Physica A: Statistical Mechanics and its Applications 243 (1997) 1, pp. 37-46

Transport between a drifting and a non-drifting gas near the edge of a thin separating wall is investigated. Monte … Carlo simulations show that net transport of particles takes place predominantly near the edge of the wall. The effects of …

Persistent link: https://www.econbiz.de/10010587400

A random walker on a ratchet

Mateos, José L. - In: Physica A: Statistical Mechanics and its Applications 351 (2005) 1, pp. 79-87

We analyze a model for a walker moving on a ratchet potential. This model is motivated by the properties of transport … the current, indicating optimal transport. …

Persistent link: https://www.econbiz.de/10010588978

A transport theory contribution to the understanding of current transient

Mostacci, D.; Molinari, V.; Maritato, L. - In: Physica A: Statistical Mechanics and its Applications 343 (2004) C, pp. 474-486

In this work, the distribution function for electrons inside a solid was obtained for several collision frequency models. The distortion of the Fermi distribution function induced by the electric field was shown at different times: its behaviour at early times proved particularly interesting....

Persistent link: https://www.econbiz.de/10010589293

A transport theory contribution to the understanding of conductivity in metals

Mostacci, D.; Molinari, V.; Giusti, D.; Maritato, L. - In: Physica A: Statistical Mechanics and its Applications 291 (2001) 1, pp. 345-361

In the transport of conduction electrons different types of scattering interaction can be recognized, with cross …

Persistent link: https://www.econbiz.de/10010589472

Effects of decision-making on the transport costs across complex networks

Gourley, Sean; Johnson, Neil. F. - In: Physica A: Statistical Mechanics and its Applications 363 (2006) 1, pp. 82-88

We analyse the effects of agents’ decisions on the creation of congestion on a centralised network with ring-and-hub topology. We show that there are two classes of agents each displaying a distinct set of behaviours. The dynamics of the system are driven by an interplay between the formation...

Persistent link: https://www.econbiz.de/10010589505

Environment-dependent transport in multiple asymmetric well potentials

Rosa, Jane; Beims, Marcus W. - In: Physica A: Statistical Mechanics and its Applications 342 (2004) 1, pp. 29-33

The classical transport of particles in multiple asymmetric well potentials is studied through numerical integration of … oscillators is discussed and the transport is analyzed as a function of coupling strength and number of oscillators. It is shown … that by increasing the coupling strength or the number of oscillators, the transport process can be destroyed. …

Persistent link: https://www.econbiz.de/10010589616

Fractional vector calculus for fractional advection–dispersion

Meerschaert, Mark M.; Mortensen, Jeff; Wheatcraft, … - In: Physica A: Statistical Mechanics and its Applications 367 (2006) C, pp. 181-190

We develop the basic tools of fractional vector calculus including a fractional derivative version of the gradient, divergence, and curl, and a fractional divergence theorem and Stokes theorem. These basic tools are then applied to provide a physical explanation for the fractional...

Persistent link: https://www.econbiz.de/10010589879