The recently proposed orthogonal time frequency space (OTFS) modulation technique was shown to provide significant error performance advantages over orthogonal frequency division multiplexing (OFDM) in Doppler channels. In this paper, we first derive the explicit input–output relation describing OTFS modulation and demodulation (mod/demod) for delay–Doppler channels. We then analyze the cases o...

Open-channel bifurcations are the most common water diversion structures in irrigation districts. In conveyance, transport efficiency and sedimentation primary concerns. This study accordingly analyzes influence of open-channel on delivery areas. Herein, three-dimensional flow at an bifurcation was studied via numerical simulations using FLOW-3D software including 15 sets working conditions. Th...

The study?s main objective is to assess a channel heat exchanger?s thermal and hydraulic characteristics in the presence of turbulent air-flow at fixed Reynolds number. Using two distinct versions obstacles terms their shape, fix?ation, arrangement, baffles fins are implanted inside channel. To convert conventional flow path into wave-shaped one, first model contains rectangular alternately dis...

Experiments were performed to study the flow characteristics of ethanol and methanol flow in rectangular micro-channels using test models 1 and 2 (TM1, TM2). The TM1 and TM2 used were of 47 and 50 micro-channels in rectangular crosssection of equivalent diameters of 387 and 327 m respectively. The channel length of 192 mm were fabricated on a 304 stainless steel substrate (230 mm x 160 mm x 1....

In this paper, a simple but accurate modeling method for obtaining analytical solutions for the fundamental characteristics of electroosmotic ow through rectangular pumping channels without the Debye–Hückel approximation is presented. The Poisson–Boltzmann equation without the ebye–Hückel approximation for the electric potential distribution and the momentum equation for the velocity profile ar...

Equations are developed for the tidally-averaged, width-averaged estuarine salinity and circulation in a rectangular estuary. Width and depth may vary along the length of the channel, as may coefficients of vertical turbulent mixing and along channel diffusion. The system is reduced to a single first-order, nonlinear, ordinary differential equation governing the section-averaged salinity. A tec...

The pattern selection problem in binary-mixture convection in an extended channel with a lateral through-flow is presented. The through-flow breaks left–right parity and changes pattern dynamics dramatically. The problem is studied based on computer simulation of the complete set of hydrodynamic equations (OberbeckBoussinesq approximation) in the two-dimensional rectangular channel with aspect ...

Numerical methods are presented for simulating stochastic-in-time current pulses for an electrodiffusion model of the biological channel, with a fixed applied voltage across the channel. The electrodiffusion model consists of the parabolic advection-diffusion equation coupled either to Gauss' law or Poisson's equation, depending on the choice of boundary conditions. The TRBDF2 method is employe...

It has been possible to modify the sampler module of the AutoAnalyzer to enable laboratoriespossessingadditional recorder and colorimeter units to analyse two sets of specimens simultaneously. Basically the device consists of a circular plastic channel of rectangular cross-section which fits on top of the normal sample plate and carries a second ring of cups (Fig. 1). The external diameter is 1...