Abstract: The present invention provides a method of producing a latent polarized image having high contrast characteristics with no apparent contours or traces of the image under normal visualization. A polymer solution is prepared in an organic solvent, and then applied onto a light-reflecting substrate. The polymer layer is dried to produce an optically isotropic polymer layer and anisotropic images are formed on the polymer layer. The polymer solution's concentration is from 5 to 30% by weight, and the images are formed by application of micro-lines by thermo-mechanical means, having depths from 1 to 3 ?m and being separated from one another by 4 to 6 ?m at a process rate from 10 to 50 m/min. The thermomechanical means operates at a temperature that is 10 to 60% less than the polymer melting/disintegration temperature and contacts the polymer layer to form micro-lines for 0.015 to 0.650 msec.

Abstract: The invention is related to polygraphy, and, in particular, to the production of polymer layers documents, security papers, banknotes as well as for manufacturing of excise documentary stamps, labels, tags and other products of the kind.

Abstract: A multi-phase induction motor torque control method comprising the steps of establishing an adaptive speed observer and an adaptive flux observer using a speed sensorless control scheme. Rotor speed is estimated based on filtered current and voltage command signals as inputs. A flux observer based on the estimated rotor speed and rotor flux angle is calculated using the estimated rotor flux. Torque is determined following estimation of speed and flux.

Abstract: A multi-phase induction motor torque control method comprising the steps of establishing an adaptive speed observer and an adaptive flux observer using a speed sensorless control scheme. Rotor speed is estimated based on filtered current and voltage command signals as inputs. A flux observer based on the estimated rotor speed and rotor flux angle is calculated using the estimated rotor flux. Torque is determined following estimation of speed and flux.

Abstract: A pipe-welding mill for production of coiled pipes from coiled strips comprises a coil preparation section including unwinders disposed in a manner allowing displacement thereof in a direction perpendicular to the direction of pipe movement, and a magazine including a reel with set-up coils, the mill further including a strip coupler, shaping, welding, and drawing stands, a coiling arrangement with bending rollers, and cutting and receiving arrangements, the components being successively installed in the direction of pipe movement. Guide or receiving rollers of the receiving arrangement are located on a platform installed in a manner allowing the platform tilt with respect to the axes of the bending rollers, the receiving rollers being connected to the output shaft of the drive of the bending rollers through a universal joint.