We investigate the growth of tidal instabilities in accretion discs in a binary star potential, using three dimensional numerical simulations. As expected from analytic work, the disc is prone to an eccentric instability provided that it is large enough to extend to the 3:1 resonance. The eccentric disc leads to positive superhumps in the light curve. It has been proposed that negative superhum...

perfectionism, in fact, is an irrational belief individuals have about themselves and their surroundings. perfectionists believe that they and their surroundings must be complete and any attempt in life must be without error. the aim of the present study was to determine the relationship of positive and negative perfectionism with competitive state anxiety. 100 soccer players completed positive...

BACKGROUND The position and arrangement of teeth as well as the entire scheme of occlusion differs from one individual to the other .The purpose of this study was to examine differences in position and inclination of incisors, overjet, overbite and lower arch crowding in subjects with different depths of curve of Spee and to determine correlations between depth of curve of Spee and these variab...