Three-dimensional optimization of squealer-tip for a transonic axial-flow compressor rotor blade.

This research represents an innovative method for geometry generation of the squealer-tip in axial compressor rotors and its exploit in a numerical optimization process to obtain a better stage performance. For this purpose, the NASA Rotor-67 transonic compressor rotor blade is used as a test case to study the aerodynamic performance using computational fluid dynamics. The validation was performed for the characteristic map at the design speed and the comparison with the experimental results indicates excellent matching and high adaptability of the numerical method.

Pre-transplant calcium-phosphate-parathormone homeostasis as a risk factor for early graft dysfunction.

While good organ quality and ideal transplant conditions eliminate many of the know factors that compromise initial graft function (IGF), poor early graft function (EGF) still occurs after living donor kidney transplantation (LDKT). Uncontrolled pre-transplant hypercalcemia and hyperparathyroidism are associated with impaired allograft function. Between April 2004 and January 2006, data were collected on 354 LDKT recipients including 252 males and 102 females, to determine risk factors for poor EGF, defined as either delayed or slow graft function (DGF or SGF).