64,381 research outputs found
Fluid dynamics video of domains with spiral dislocations formed in the wake of an enslaved phase-separation front
Enslaved phase-separation fronts that move with a speed just smaller than
that of a free front will leave in their wake a morphology of alternating
domains that are roughly aligned with the front. However, these alternating
domains will typically not be in phase initially. Instead there are defects.
Here we present novel phase-separation morphologies that are formed in such
systems where the defects are reminiscent of spiral dislocations in crystal
growth.Comment: 1 pag
Scalar Casimir Energies for Separable Coordinate Systems: Application to Semi-transparent Planes in an Annulus
We derive a simplified general expression for the two-body scalar Casimir
energy in generalized separable coordinate systems. We apply this technique to
the case of radial semi-transparent planes in the annular region between two
concentric Dirichlet cylinders. This situation is explored both analytically
and numerically.Comment: 8 pages, 5 figures. Contribution to Proceedings of 9th Conference on
Quantum Field Theory Under the Influence of External Conditions, QFEXT0
Biology helps to construct weighted scale free networks
In this work we study a simple evolutionary model of bipartite networks which
its evolution is based on the duplication of nodes. Using analytical results
along with numerical simulation of the model, we show that the above
evolutionary model results in weighted scale free networks. Indeed we find that
in the one mode picture we have weighted networks with scale free distributions
for interesting quantities like the weights, the degrees and the weighted
degrees of the nodes and the weights of the edges.Comment: 15 pages, 7 figures, Revte
A Symmetric Free Energy Based Multi-Component Lattice Boltzmann Method
We present a lattice Boltzmann algorithm based on an underlying free energy
that allows the simulation of the dynamics of a multicomponent system with an
arbitrary number of components. The thermodynamic properties, such as the
chemical potential of each component and the pressure of the overall system,
are incorporated in the model. We derived a symmetrical convection diffusion
equation for each component as well as the Navier Stokes equation and
continuity equation for the overall system. The algorithm was verified through
simulations of binary and ternary systems. The equilibrium concentrations of
components of binary and ternary systems simulated with our algorithm agree
well with theoretical expectations.Comment: 7 pager, 4 figure
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