background: 99mtc is a widely used radioisotope in nuclear medicine centers which is obtained by elution from mo-99/tc-99m generators. usually the generators are either supplied by the iran atomic energy agency or by private companies from foreign countries. in this study we have measured 99mo contamination in 99mtc elute from different generators in a period of one year. materials and methods:...

A unique Taylor-vortex membrane reactor (TVMR) design for continuous gas-liquid reactions is presented in this work. The consists of a cylindrical rotor inside stationary concentric vessel, and flexible system equispaced baffle rings surrounding the rotor. This restricts annular cross section to small gap between baffles rotor, divides annulus into 18 mixing zones. support 6 m long PFA tubular ...

Delay in the onset of static stall via passive vortex generators (VGs) results more efficient equipment. Nevertheless, most studies VGs are conducted on wind turbine blades rather than other turbomachinery devices like axial fan blades. This study is feasibility research to see whether aerodynamic performance improves presence VGs. Therefore, VGs' effect a blade with an elliptical profile havin...