484 research outputs found
Dual Killing-Yano symmetry and multipole moments in electromagnetism and mechanics of continua
In this work we introduce the Killing-Yano symmetry on the phase space and we
investigate the symplectic structure on the space of Killing-Yano tensors. We
perform the detailed analyze of the -dimensional flat space and the
Riemaniann manifolds with constant scalar curvature. We investigate the form of
some multipole tensors, which arise in the expansion of a system of charges and
currents, in terms of second-order Killing-Yano tensors in the phase space of
classical mechanics.
We find some relations between these tensors and the generators of dynamical
symmetries like the angular momentum, the mass-inertia tensor, the conformal
operator and the momentum conjugate Runge-Lenz vector.Comment: 11 pages LaTeX, no figures, content enlarged and revised, accepted
for publication in Helvetica Physica Act
Stationary rotation of the unbalanced rotor with the liquid autobalancing device under action of external friction forces
Influence of external friction forces on rotation of the rotor with the liquid autobalancing device is considered. The liquid in the balancing chamber at stationary movement rotates together with the rotor as solids. Analytical expressions for deflection of the shaft, unbalance of the system and the necessary rotating moment from the engine providing rotation with set speed are received
Stationary rotation stability of unbalanced rotor with autobalancing device with liquid on flexible shaft
The condition of rotor rotation stability with liquid autobalancing device consisting of chamber, float and incompressible homogeneous liquid filling the space between them has been obtained. The restoring force and forces of internal and external friction take effect on the rotor. The latter depend linearly respectively on strain rate and absolute velocity of rotor connection point to the shaf
Two-dimensional micromagnetic simulation of domain structures in films with combined anisotropy
The transformation of the domain structure of micrometer-thick films with variations in the induced uniaxial anisotropy constant with the easy magnetization axis perpendicular to the film surface has been investigated using numerical micromagnetic simulation in the framework of a two-dimensional model of the magnetization distribution. The case where the tetra-axial crystallographic anisotropy exists in the film with uniaxial magnetic anisotropy has been considered. The transformation of the open domain structure into the structure with a magnetic flux closed inside the sample has been investigated in detail, and new types of 109-degree and 90-degree vortex-like domain walls and periodic domain structures have been obtained. Β© 2013 Pleiades Publishing, Ltd
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