Abstract: A device for taking samples of bottom sediments from water basins includes at least one vertical sectional coring tube having a closed upper end provided with a check valve. The device includes, in the form of a cover, also a device for preventing the loss of a taken sample in the process of the device lifting, closing in a rest position the open lower end of the coring tube and being connected with the movable rod. The rod is secured by hinges to the carrying element. The upper end of the coring tube is secured to the carrying element.

Abstract: A process for producing a water-soluble polyelectrolyte which comprises reacting acrylic acid and/or methacrylic acid with ammonium carbonate at a temperature of 15.degree.-20.degree. C. and at a molar ratio of the acrylic acids to ammonium carbonate of 1-4:1 respectively; the resulting reaction mass is added with hydrogen peroxide in an amount of 0.1-1.0% by mass of the acrylic acids and with a 5-14% aqueous solution of a joiner's glue based on animal-origin proteins in an amount of 0.7-2.0% by mass of acrylic acids as calculated for dry solids, the reaction mass is polymerized first at a temperature of 15.degree.-23.degree. C. for 30-60 minutes and then--at a spontaneous elevation of temperature to 110.degree.-130.degree. C.

Abstract: A characteristic feature of the design are the rounded off peripheral portions of surfaces of discs which face each other and are spaced equidistantly apart, the discs being rigidly attached to a power-driven rotor.

Abstract: A device for taking samples of bottom sediments from water basins, comprises a vertical sectional coring tube, a ballast weight, rod-type vertical supports and shock-absorbing units. The latter are made in the form of hollow cylinders with closed ends, with a plunger in each cylinder and installed in parallel with the coring tube from the outside. A hole is made in the upper and lower ends of each cylinder, and passed through the holes in the lower ends are the rod-type supports each of which is rigidly connected by one end with a respective plunger.

Abstract: An optical prosthetic device made from a material based on silicone compounds is a cured composition resulting from vulcanization of a mixture of .alpha.,.omega.-bis-trivinylsiloxyoligodimethyl(methylphenyl)-siloxane and .alpha.,.omega.-bis-trimethyl(dimethylhydro)siloxyoligomethyl(phenyl)methy lhydro-siloxane in the presence of a polyaddition reaction catalyst based on the compounds of metals of the platinum group, the ratio of the first mixture component to the second one ranging within 100:1 and 100:20 parts by mass.

Abstract: A photo- and electron resist distributed in an organic solvent, and including an additive which forms a donor-acceptor complex to eliminate luminescence effects and increase the stability of the resist.The photo- and electron resist can be used in microelectronics, optics, printing and precision machine building industry when resists are employed to manufacture structures of semiconductor devices and solid-state circuits.