TALL-1/BAFF/BLyS was recently identified as a member of the tumor necrosis factor (TNF) ligand family. The crystal structure of the functional soluble TALL-1 (sTALL-1) has been determined at 3.0 A. sTALL-1 forms a virus-like assembly with 200 A diameter in the crystals, containing 60 sTALL-1 monomers. The cluster formation is mediated by a "flap" region of the sTALL-1 monomer. The virus-like as...

Rotating stall contributes to global oscillation vibration problems, accompanied by noise and possible turbomachinery damage. This study with special emphasis on the vaned diffuser investigates unsteady pressure interaction within pump. A low specific speed centrifugal pump (ns = 69), fitted a is modeled studied. The model performance curve shows characteristic positive slope at 30% of best eff...

Abstract Dynamic stall on an airfoil comprises a series of complex aerodynamic phenomena in response to an unsteady change of the angle of attack. It is accompanied by a lift overshoot and delayed massive flow separation with respect to static stall. The classical hallmark of the dynamic stall phenomenon is the dynamic stall vortex. The flow over an oscillating OA209 airfoil under dynamic stall...

Leonardo Baldassarre is currently the Engineering Manager & Principal Engineer for Compressors & Expanders with General Electric Oil & Gas Company, in Florence, Italy. He is responsible for all requisition, and standardization as well as for detailed design of new products for centrifugal compressors, reciprocating compressors and turboexpanders. Dr.Baldassarre began his career with General Ele...

Stall phenomenon, a classical physical phenomenon which is located in the vaneless region of pump–turbine and accompanied by complex vortex evolution process, strongly related to formation hump unsteady at pump mode S turbine mode. In present paper, detached eddy simulation model employed numerically investigate impact runner high-pressure side (HPS) on stall characteristics typical operating p...