Ratchet device with broken friction symmetry

An experimental setup (gadget) has been made for demonstration of a ratchet mechanism induced by broken symmetry of a dependence of dry friction on external forcing. This gadget converts longitudinal oscillating or fluctuating motion into a unidirectional rotation, the direction of which is in accordance with given theoretical arguments. Despite the setup being three dimensional, the ratchet rotary motion is proved to be described by one simple dynamic equation. This kind of motion is a result of the interplay of friction and inertia

Two-dimensional dynamics of a free molecular chain with a secondary structure

A simple two-dimensional ͑2D͒ model of an isolated (free) molecular chain with primary and secondary structures has been suggested and investigated both analytically and numerically. This model can be considered as the simplest generalization of the well-known Fermi-Pasta-Ulam model of an anharmonic chain in order to include transverse degrees of freedom of the chain molecules. Both the structures are provided by the first-and second-neighbor intermolecular bonds, respectively, resulting in a regular zig-zag (''2D helix'') chain on a plane. The set of two coupled nonlinear field equations with respect to the longitudinal and transverse displacements of the chain molecules has been derived. Two types of stable ͑nontopological͒ soliton solutions which describe either ͑i͒ a supersonic solitary wave of longitudinal stretching accompanied by transverse slendering or, as in the 1D model, ͑ii͒ supersonic pulses of longitudinal compression propagating together with localized transverse thickening (bulge) have been found. Some peculiar stability properties of these two-component soliton solutions have been discovered by using numerical techniques developed in this paper. ͓S1063-651X͑96͒10809-6

Soliton models of power and charge transfer in systems with hydrogen bond

The investigation is concerned with the nonlinear dynamics of one-dimensional molecular lattices, soliton physics. The object to be attained is soliton simulation of dynamic processes of transfer of oscillating power, electrons and protons in quasi-one-dimensional molecular chains. The soliton models for description of dynamic processes of transfer of power of intermolecular excitation amid-I, electrons in quasi-one-dimensional molecular systems have been developed and studied; the features of nonlinear dynamics of one-dimensional molecular lattices in consideration of various anharmonic corrections have been studied. The newly developed models can found application in the theory of molecular crystals, theoretical biophysicsAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio