where QT = R d×(0, T ) with T > 0 fixed, u : QT → R is the sough function, V : R → R is a (not necessarily divergence free) velocity field, f : R → R is the convective flux function, and A : R → R is the “diffusion” function. For the diffusion function the basic assumption is that A(·) is nonincreasing. This condition implies that (1.1) is a (strongly) degenerate parabolic problem. For example,...

Abstract A 3D model of straight-through labyrinth liquid seal for water pump was built to analyse the fluid-induced forces. We found that eccentricity and pressure difference have great impact on both tangential force radial force. The increases along with rotating speed. When tooth hight is T h =2.4mm, comes minimum. width Tw =2.0mm, maximum. numbers a influence more number sealing teeth will ...

Inspired by the application scenarios such as battery-operated wireless sensor networks (WSN), we investigate the design of an easy-to-implement energy-efficient two-way relaying scheme in which two source nodes exchange their messages with the help of an intermediate relay node. Due to their efficient decoder hardware implementation, block codes, such as Hamming and BCH codes, instead of convo...

We observed the classical T Tauri star TW Hya with HST/STIS using the E140M grating, from 1150–1700 Å, with the E230M grating, from 2200–2900 Å, and with FUSE from 900–1180 Å. Emission in 143 Lyman-band H2 lines Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in A...

in this work, the adsorption of the anionic dye, congo red (cr), from aqueous solution by using tea waste (tw) has been carried out at 30 °c. the equilibrium sorption isotherms and kinetics were investigated. the equilibrium adsorption was studied by the langmuir and freundlich models of adsorption. the experimental results manifested that the langmuir isotherm was the best model for the adsorp...

h = heat transfer coefficient q = heat flux from the wall of evaporator to refrigerant Tw =Temperature at the wall of evaporator Tf = Temperature of the refrigerant kal = Conductivity of aluminum t = Thickness of evaporator M& = Mass flow rate of refrigerant Cp = Constant-pressure specific heat of refrigerant Tsat = Saturation temperature of refrigerant Tin = Temperature of refrigerant at inlet...

Since the eighties we have begun, in Brazil, a search for Post-T Tauri stars. Here we describe the main steps of this research that resulted in the discovery of the nearby TW Hya and Horologium associations. A very recent survey resulted in the detection of three different kinematical groups: 1) the Great Austral Young Association, which is a very extended complex region involving the Horologiu...