A simple two-uid model to describe the dynamics of a plasma is the Euler-Poisson system, where the compressible electron uid interacts with its own electric eld against a constant charged ion background. The plasma frequency produced by the electric eld plays the role of`mass' term to the linearized system. Based on this`Klein-Gordon' eeect, we construct global smooth irrotational ows with smal...

In the present paper a general critisicsm of kinetic equations for vehicular traac is given. The necessity of introducing an Enskog-type correction into these equations is shown. An Enskog-like kinetic traac ow equation is presented and uid dynamic equations are derived. This derivation yields new coeecients for the standard uid dynamic equations of vehicular traac. Numerical simulations for in...

It is known that a generalized open Jackson queueing network after appropriate scaling (in both time and space) converges almost surely to a uid network under the uniform topology. Under the same topology, we show that the distance between the scaled queue length process of the queueing network and the uid level process of the corresponding uid network converges to zero in probability at an exp...

Received (received date) Revised (revised date) We investigate a new method for simulating polymer-solvent systems which combines a lattice Boltzmann approach for the uid with a continuum molecular dynamics (MD) model for the polymer chain. The two parts are coupled by a friction force which is proportional to the diierence of the monomer velocity and the uid velocity at the monomer's position....

This paper presents an approach to measuring uid ow from image sequences. The approach centers around a motion recovery algorithm that is based on principles from uid mechanics: The algorithm is constrained so that recovered ows observe conservation of mass as well as physically motivated boundary conditions. Results are presented from application of the algorithm to transmittance imagery of ui...

In this paper we consider an initial and boundary value problem modeling the self-propelled motion of solids in a bi-dimensional viscous incompressible uid. The self-propelling mechanism, consisting in appropriate deformations of the solids, is a simpli ed model for the propulsion mechanism of sh-like swimmers. The governing equations are composed of the Navier-Stokes equations for the uid, cou...

In this paper, we propose a systematic method for finding impossible differentials for block cipher structures, better than the Umethod introduced by Kim et al [4]. It is referred as a unified impossible differential finding method (UID-method). We apply the UID-method to some popular block ciphers such as Gen-Skipjack, Gen-CAST256, GenMARS, Gen-RC6, Four-Cell, SMS4 and give the detailed imposs...

Liquid He immersed in porous media such as aerogel, Vycor, and Geltech silica are excellent examples of a Bosons in disorder and con nement. Of special interest is the impact of disorder on BoseEinstein condensation (BEC), on the elementary excitations of the super uid and on their connection to the super uid properties. Indeed, the modi cations induced by disorder can be used to reveal the int...

In this paper we study the sedimentation of several thousand circular particles in 2D using the method of distributed Lagrange multipliers for solid-liquid ow. The simulation gives rise to ngering which resembles Rayleigh-Taylor instabilities. The waves have a well de ned wavelength and growth rate which can be modeled as a conventional Rayleigh-Taylor instability of heavy uid above light. The ...

This thesis is concerned with uid motion analysis in image sequences and involves two main issues.In a rst part, we address the problem of estimating a dense motion eld. Due to the great deal ofspatial and temporal distortions that luminance patterns exhibit in uid imagery, standard techniquesfrom Computer Vision, originally designed for quasi-rigid motions with stable salient f...