We study global asymptotic behavior of Poisson-Nernst-Planck (PNP) systems for flow of two ion species through a narrow tubular-like membrane channel. As the radius of the cross-section of the three-dimensional tubular-like membrane channel approaches zero, a one-dimensional limiting PNP system is derived. This one-dimensional limiting system differs from previously studied one-dimensional PNP ...

  In this numerical study the the heat transfer and laminar nanofluid flow in the three-dimensional microchannels with triangular cross-section is simulated. For increase the heat transfer from the walls of the channel, semiattached & offset mid- truncated rib,s Placed in the canal, and the tooth geometry and the impact is studied. In this study, the water is base fluid, and the influence of th...

One of the newest of viscoelastic RANS turbulence models for drag reducing channel flow with polymer additives is studied in different flow and rheological properties. In this model, finitely extensible nonlinear elastic-Peterlin (FENE-P) constitutive model is used to describe the viscoelastic effect of polymer solution and turbulence model is developed in the k-ϵ-(ν^2 ) ̅-f framework. The geome...

We present a MIMO channel modelling approach that combines the advantages of geometry-based and stochastic elements. The channel is characterised by a timeand delay-dependent MIMO channel matrix that contains the impulse responses from each transmit to each receive antenna (for both polarisations), calculated from dual-polarised doubledirectional wave propagation. Based on 5GHz indoor measureme...

Many microfluidic devices use macroscopic pressure differentials to overcome viscous friction and generate flows in microchannels. In this work, we investigate how the chemical and geometric properties of the channel walls can drive a net flow by exploiting the autophoretic slip flows induced along active walls by local concentration gradients of a solute species. We show that chemical patterni...

A channel model for line-of-sight (LoS) microcell in dense urban areas is proposed. It is a kind of geometry-based stochastic channel model (GSCM) for which the scattering-powerdistribution (SPD) in the channel seen from the receiver mobile terminal (MT) based on the physical phenomenon is obtained. Furthermore, information from a specific environment can be inserted into the model to acquire t...

Introduction: Ever since the first recognition of channels on Mars, attempts to estimate the flow characteristics of channel systems and their sediment transport consequences have been a holy grail of martian hydrological and sedimentological studies [1-4]. Previous attempts were severely hampered by the lack of sufficiently precise data to perform the necessary calculations. The MOLA data set ...

For an undirected graph G = (V,E), let G denote the graph whose vertex set is V n in which two distinct vertices (u1, u2, . . . , un) and (v1, v2, . . . , vn) are adjacent iff for all i between 1 and n either ui = vi or uivi ∈ E. The Shannon capacity c(G) of G is the limit limn→∞(α(G)), where α(G) is the maximum size of an independent set of vertices in G. We show that there are graphs G and H ...

The absence of deviations from the Standard Model for the differential cross section dσ dQ at HERA is used to set limits on electron quark compositeness scale and on new vector bosons, especially the hadrophilic one recently introduced as a possible explanation for LEP/SLC and CDF anomalies. ———————————— 1 Moniteur CIES and allocataire MENESR. email : [email protected]