this paper addresses an experimental investigation in the hydrodynamic behavior of a modified slotted sieve tray. slotted sieve tray (push valve sieve tray) is a sieve tray that the push valves have been utilized on the tray deck to eliminate liquid gradients and non-uniformity of liquid distribution on the tray. the air-water system was used in an industrial scale experimental rig with an inte...

Abstract Copper(II) on 4 Å molecular sieve was found to be an efficient heterogeneous catalyst in the addition of different H -phosphinates and secondary phosphine oxides phenylacetylene. All hydrophosphinylation reactions were completely regioselective, as only β-isomers formed, E -alkenylphosphinates -alkenylphosphine synthesized moderate excellent yields. The could reused multiple times reac...

In minor veins of leaves of Beta vulgaris L. (sugar beet) yellows virus particles were found both in parenchyma cells and in mature sieve elements. In parenchyma cells the particles were usually confined to the cytoplasm, that is, they were absent from the vacuoles. In the sieve elements, which at maturity have no vacuoles, the particles were scattered throughout the cell. In dense aggregations...