A lattice Boltzmann scheme is developed for homogeneous mixture modeling, based on the multiple-relaxation-time (MRT) formulation, which fully recovers the Maxwell-Stefan diffusion model in the continuum limit with (a) external force and (b) tunable Schmidt number. The theoretical basis of the proposed MRT formulation is a recently proposed Bhatnagar-Gross-Krook-type kinetic model for gas mixtu...

The classical two-phase Stefan problem in level set formulation is considered. The implementation of a solver on triangular grids is described. Extended finite elements (X-FEM) in space and an implicit Euler method in time are used to approximate the temperature. For the level set equation, a discontinuous Galerkin (DG) and a strong stability preserving (SSP) RungeKutta scheme are employed. Pol...

We present time-parallel multigrid methods for the eecient numerical solution of moving boundary problems of two-phase Stefan type describing heat transfer processes with a change of phase. Using either a direct approach to the nonlinear enthalpy formulation of the problem or a linearization thereof based on semigroup theory, parallelism comes in by the simultaneous application of multigrid met...

Brent Hoon (Brent ByungHoon Kang, UNC at Charlotte) said that although Conficker had been contained (by buying up the domain names to be used in C&C) in 2009, Conficker has never disappeared. They are still seeing hits, and there appear to be about six million IP addresses that show signs of infection. Stefan Savage wondered how you could economically get patches to six million people. Someone ...

It seems using the Maxwell-Stefan (M-S) diffusion model in combination with the vacancy solution theory (VST) and the single-component adsorption data provides a superior, qualitative, and quantitative prediction of diffusion in zeolites. In the M-S formulation, thermodynamic factor (Г) is an essential parameter which must be estimated by an adsorption isotherm. Researchers usually utilize the ...

References: 1) Husain Aljazzar and Stefan Leue: Debugging of Dependability Models Using Interactive Visualization of Counterexamples, to appear in proceedings of QEST 2008. 2) Husain Aljazzar and Stefan Leue: Directed explicit state-space search in the generation of counterexamples for probabilistic reachability, 2008, submitted for journal publication. 3) Husain Aljazzar and Stefan Leue: Count...

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Optimal control (motion planning) of the free interface in classical two-phase Stefan problems is considered. The evolution of the free interface is modeled by a level set function. The first-order optimality system is derived on a formal basis. It provides gradient information based on the adjoint temperature and adjoint level set function. Suitable discretization schemes for the forward and a...

Department for Geoand Environmental Sciences, GeobioCenter and Center for Nanoscience, Ludwig-Maximilians-Universität, Theresienstrasse 41, 80333 München, Germany *E-mail: [email protected] URL: www.nanobiomed.de Over the last 15 years, the use of atomic force microscopy (AFM) has spread from the materials science of hard matter to the fields of biology and biomolecular research....

The best stage in a scientist s career is ... when they can still do chemistry in the lab with their own hands. The biggest problem that scientists face is ...—sadly enough—to focus on science. The best advice I have ever been given is ... not to get frustrated over problems but to come up with respective solutions (J. M. J. Fr chet). A good work day begins with ... breakfast with the family, r...