In this paper, we investigate the performance of turbo codes when applied to a frequency hopped spread spectrum system with partial-band interference, full-band thermal noise, and Rayleigh fading. We consider two types of channel side information: knowledge that the transmitted bit is jammed or unjammed and knowledge of the instantaneous fading amplitudes. Simulation is performed for coherent a...

This article deals with the thermal convection in a dielectric fluid confined in a finite-length plane capacitor with a temperature gradient under microgravity conditions. The dielectrophoretic force resulting from differential polarization of the fluid plays the role of buoyancy force associated with an electric effective gravity. It induces the convection when the Rayleigh number based on thi...

In this work, the steady and laminar mixed convection of nanofluid in horizontal concentric annulus withrotating inner cylinder is investigated numerically. The inner and outer cylinders are kept at constanttemperature Ti and To respectively, where Ti>To. The annular space is filled with Alumina-water nanofluid.The governing equations with the corresponded boundary conditions in the polar coord...

The onset of convection in the form of magneto-inertial waves in a rotating fluid sphere permeated by a constant axial electric current is studied through a perturbation analysis. Explicit expressions for the dependence of the Rayleigh number on the azimuthal wavenumber are derived in the limit of high thermal diffusivity. Results for the cases of thermally infinitely conducting and of nearly t...

The aim of this study was to investigate the effect of conducting boundaries on the onset of convection in a binary fluid-saturated porous layer. The isotropic saturated porous layer is bounded by two impermeable but thermally conducting plates, subjected to a constant heat flux. These plates have identical conductivity. Moreover, the conductivity of the plates is generally different from the p...

In this paper, we investigate the performance of turbo codes when applied to a frequency hopped spread spectrum system with partial-band interference, full-band thermal noise, and Rayleigh fading. We consider two types of channel side information: knowledge that the transmitted bit is jammed or unjammed and knowledge of the instantaneous fading amplitudes. Simulation is performed for coherent a...

We present direct numerical simulations of Boussinesq and non-Boussinesq Rayleigh–Bénard convection in a rigid box containing a perfect gas. For small stratifications, which includes Boussinesq fluids, the first instability after steady rolls was an oscillatory instability ~a Hopf bifurcation!. The resulting convection was characterized by two hot and two cold blobs circulating each convective ...

A numerical and analytical study of the free convection thermal boundary layer or wall jet at nite Prandtl number is performed to understand the mechanisms of the separation of a high Prandtl number thermal boundary layer ows The model is that adopted by Smith Duck in which the upstream in uence delineates the ow into a double deck structure with the lower deck having thickness O R R being the ...

The bio-thermal convection in a rotating layer of porous medium saturated with Newtonian fluid gyrotactic microorganisms is studied on the basis Darcy–Brinkman model. A linear analysis carried out using Galerkin method for rigid-rigid boundary conditions. In stationary regime, we obtained dispersion equation relation between thermal Rayleigh–Darcy number and bioconvection. influence Peclet numb...