The closed relativistic string carrying a point-like mass in the space with nontrivial geometry is considered. For rotational states of this system (resulting in non-trivial Regge trajectories) the stability problem is solved. It was shown that rotations of the folded string with the massive point placed at the rotational center are stable (with respect to small disturbances) if the mass exceed...

Compared to nanoscale friction of translational motion, the mechanisms rotational have received less attention. Such motion becomes an important issue for miniaturization mechanical machinery that often involves rotating gears. In this study, molecular-dynamics simulations are performed explore solid-state gears on top different substrates. each case, viscous damping is observed and found be in...

introduction: animal models of parkinson’s disease (pd) with partial damage of nigrostriatal dopaminergic system are very suitable for development of treatment strategies. although drug-induced rotational behavior has been conventionally used for analysis of lesioned animals, but bcause of the development of sensitization, it is necessary to invent a pure behavioral test that can evaluate such ...

Rotational excitation and spatial alignment in moderate intensity radiation fields are studied numerically and analytically, using time-dependent quantum mechanics. Substantial rotational excitation is found under conditions typically used in time-resolved spectroscopy experiments. The broad rotational wave packet excited by the laser pulse is well defined in the conjugate angle space, peaking ...

We present a systematic understanding of the rotational structure of a long-range (vibrationally highly-excited) diatomic molecule. For example, we show that depending on a quantum defect, the leastbound vibrational state of a diatomic molecule with −Cn/r (n > 2) asymptotic interaction can have only 1, 2, and up to a maximum of n − 2 rotational levels. A classification scheme of diatomic molecu...