Abstract It has been repeatedly assumed that Heinz Lettau found the Obukhov length in 1949 independently of 1946. However, it was not characteristic scale, L , but ratio height and ( z / ), stability parameter, he analyzed. Whether described parameter is investigated herein. Regardless speculation about this, significant contributions made by application merit this term being called Obukhov–Let...

stability and performance are two main issues in motion of bipeds. to ensure stability of motion, a biped needs to follow specific pattern to comply with a stability criterion such as zero moment point. however, there are infinity many patterns of motion which ensure stability, so one might think of achieving better performance by choosing proper parameters of motion. step length and step perio...

This study focuses on the creep response of meso-length scale systems, whose smallest dimensions lie in range a few hundred micrometers to millimeters. Here, uniaxial experiments were performed commercially pure Al polycrystals using samples having (or, characteristic sample) dimension 500 μm 7 mm “five”-power law regime. Compared interior, near-surface region developed compliant dislocation su...