Abstract Hole expansion ratio of hot rolled ultra-high strength martensitic steels with tensile around 1000 MPa was evaluated. Steels were produced direct quenching and traditional reheat processes final thickness 3 mm. Achieved yield values (R p0.2 ) varied between 918 – 1068 depending on the processing route. Mean hole ratios (HER) in direct-quenched (DQ) tempered (DQT) conditions 22 36 %, no...

An asymptotic expansion for a ratio of products of gamma functions is derived. 2000 Mathematics Subject Classification: Primary 33B15; Secondary 33C20

objective(s): ex vivo expansion of hematopoitic stem cells is an alternative way to increase umbilical cord blood (ucb)-cd34+ cells for bone marrow transplantation. for this purpose demineralized bone matrix (dbm) and mineralized bone allograft (mba) as two scaffolds based on bone matrix and stem cell niche, were simultaneously used to enhance the effect of human mesenchymal progenitor cells (m...