Microkinetics models for the partial oxidations of ethylene and of methanol on silver catalysts are coupled with computational fluid dynamics and implemented in a randomly packed bed of 120 spherical particles. The model includes interactions of the elementary reaction steps and transport inside the particles and the flow field. The effects of using the full implementation of the microkinetics ...

Image smoothing based on anisotropic diffusion provides better performance than classical linear filtering. One difficulty is to compare and evaluate the different models proposed. Since the basic model arises from fluid mechanics, we propose to track anisotropic diffusion using an optical flow technique through a new physics based image model. Consequently to this, we propose a new choice for ...

Surface wave dispersion measurements for Love wave overtones carry evidence of azimuthal anisotropy in the transition zone of Earth's mantle (400 to 660 kilometers deep). A Backus-Gilbert inversion of anisotropic phase velocity maps, with resolution kernels mainly sensitive to the transition zone, shows a robust long-wavelength azimuthally anisotropic velocity structure. This observation puts n...

A modest in-plane magnetic field Bk is sufficient to destroy the fractional quantized Hall states at 1⁄4 5=2 and 7=2 and replace them with anisotropic compressible phases. Remarkably, we find that at larger Bk these anisotropic phases can themselves be replaced by isotropic compressible phases reminiscent of the composite fermion fluid at 1⁄4 1=2. We present strong evidence that this transition...

Colloids are important for our daily life and modern technologies. Among which the colloidal particles with anisotropic properties in geometry, surface functionality, and chemical composition emerge as an important family of the colloidal genome. Scientifically, the inand out-of-equilibrium behavior of anisotropic colloids are fundamentally different from conventional particles because of their...

Here, we adapt the concept of transformational thermodynamics, whereby the flux of temperature is controlled via anisotropic heterogeneous diffusivity, for the diffusion and transport of mass concentration. The n-dimensional, time-dependent, anisotropic heterogeneous Fick's equation is considered, which is a parabolic partial differential equation also applicable to heat diffusion, when convect...

The classical solution for the Scholte wave along a fluid and isotropic substrate .s well known. However, when the subshate is either a weakly anisotropic solid, or the adjoining fitrid is subject o a hydrostatic pressure, the analysis of Scholte wave propagation becomes rather complex and lengthy computations are required to obtain the solution. The purpose of this paper is to apply simple and...

We studied the temporal evolution of the electromagnetic and velocity fields in an incompressible conducting fluid by means of computer simulations from the Navier Stokes and Maxwell’s equations. We then derived the set of coupled partial differential equations for the stream function vector field and the electromagnetic field. These equations are first order difference equations in time and fe...