Abstract: A thermally, heat and chemically stable polyimide asymmetric ultrafiltration membrane, is a porous film or a hollow fiber, having an anisotropic structure a selective surface layer and a substrate, wherein the selective ultraporous surface layer has size of pores 70-800 ? with thickness 0.1-10 mcm and is composed of insoluble rigid-chain aromatic (co)polyimide based on dianhydride of aromatic tetracarbonic acid and aromatic diamine and located on the microporous substrate with thickness 50-250 mcm, and the membrane has water permeability Q=(2?500)·10?4 cm/sec atm and nominal molecular weight cutoff ML=(5?500)·103 g/mol, and method for producing an ultrafiltration membrane as disclosed.

Abstract: An apparatus for lengthening of extremities includes at least two supporting rings, a plurality of spikes mounted in each of the at least two supporting rings by spike-fixating elements, the at least two supporting rings connected with one another by threaded rods, which are displaced into rectilinear movement by automated drives connected with a portable block for power supply and control. Each automated drive includes a screw pair composed of a threaded rod and a threaded insert mounted via two bearings that are spaced from one another, and movable through a reducer with a stepper motor. The portable block is provided with elements for controlling a speed and a direction of movement of each of the automated drives, and a unit is provided for calculation and indication of displacement supplied by each of the automated drives.

Abstract: Aeration drying and disinfecting grain crops in bulk and pretreating seeds includes passing through a bulk of grain crops and seeds disinfecting and drying agents including an ozone and air mixture and surrounding air, subdividing the disinfecting and drying agents into a plurality of streams spaced from one another in a vertical direction, and passing the streams at different heights through levels located at corresponding heights of the bulk of grain crops and seeds transversely in a substantially horizontal direction.

Abstract: A CAD/CAM method is disclosed for a computer system to capture and interchange schematic drawing and associated design information. The schematic drawing and design information are stored in an extensible, platform-independent format.