Abstract: Combined acousto-optic device formed by a cut from optically birefringent single crystal whose one face, parallel to the direction of the principal crystallographic axis, is provided with at least one piezoelectric source of acoustic waves. At that, the normal to the entrance face of the ordinary and extraordinary light beam is inclined from the direction of principal crystallographic axis by an angle .rho. defined by formula.rho.=arc tg(n.sub.e /n.sub.o).+-.20.degree.,in which the symbols n.sub.e and n.sub.o denote the refractive indices of the extraordinary and ordinary light beams in the single crystal.

Abstract: A single crystal of pure or mixed univalent mercury halide, is formed to have a pair of opposite faces polished for entrance and exit of the light wave at least one of the faces of this pair is perpendicular to a direction inclined about a crystallographic direction by a given angle, from the optical axis of the crystal. Another face, provided with a source of acoustic waves, makes an angle of 90.degree. with the at least one face of the pair of faces.

Abstract: The invention concerns the method of feeding particles at multiple points into a fluidized bed by forming at least one auxiliary fluidized bed of the particles and fluidization fluid from which the particles in fluidized state are introduced through a system of inlets into the main fluidized bed. The invention relates to equipment for performing the method consisting of at least one chamber for formation of the auxiliary fluidized bed including the inlet of solid particles and a grid for the inlet of fluidization fluid, and a chamber for the main fluidized bed including the inlet of fluidization fluid, and a system of inlet pipes by which both chambers are mutually interconnected. The system of inlet pipes has the cross-sectional area smaller than 10% of the horizontal cross-sectional area of the main fluidized bed.

Abstract: The invention pertains to hydrophilic macroporous three dimensional copolymers of hydroxyalkyl methacrylates or hydroxyalkyl acrylates (C.sub.1 -C.sub.4 hydroxyalkyl) with crosslinking monomers which contain covalently attached saccharides via an O-glycosidic bond. The invention further pertains to the method of manufacturing of these copolymers by the direct reaction of the basic three dimensional copolymer containing hydroxyl groups with saccharides or their derivatives in an inert organic solvent under catalysis of HCl, BF.sub.3, or their mixtures at 20.degree.-100.degree. C. Saccharides and their derivatives are selected from the group comprising monosaccharides, oligosaccharides, deoxy sugars, amino saccharides, acylated saccharides, ether or halogen derivatives of monosaccharides and oligosaccharides, and the like.

Abstract: The invention relates to a negative electron resist for application in electron lithography. It consists of an organic copolymer formed by copolymerization of butadiene or isoprene with glycidyl acrylate or glycidyl methacrylate. The resist exhibits the high sensitivity to irradiation by electrons and, at the same time, a good adhesion to the base and a resistance towards common etching agents. The copolymer is advantageously prepared by radical polymerization and a high purity of the product does not require further purification. The electron resist manufactured in this way has the long-term workability.

Abstract: The invention relates to polymers and copolymers of pivaloyloxyalkyl methacrylates which contain structural units of the general formula ##STR1## where R.sup.1 is (CH.sub.2).sub.n.sbsb.1 --O (n.sub.1 =2 to 10) or (CH.sub.2 CH.sub.2 --O).sub.n.sbsb.2 (n.sub.2 =1 to 4) and to the method of their preparation and modification. The polymerization and copolymerization can be initiated by free-radical initiators of the peroxy type or by anionic initiators, e.g., alkali metal alkoxides or butyllithium, and carried out in a solution, bulk or suspension process in the presence of a crosslinking agent or without it. Anionic polymerization may result in stereoregular polymers or may be used for preparation of block copolymers by the "living" polymer technique. The polymers and copolymers can be modified by the partial or total conversion of the pivaloyloxyalkyl methacrylate units into hydroxyalkyl methacrylate units by selective hydrolysis, alcoholysis or other reaction.

Abstract: The invention concerns the design arrangement of the cap for the inlet of fluid into the fluidization bed which is heated or cooled by the methods described in U.S. Pat. Nos. 3,897,546 and 3,908,284. The cap is formed by an inlet pipe closed at its upper end on which are formed two or more mutually separated chambers, while in this pipe a number of holes is drilled for the inlet of fluid into the chambers. Into these chambers a number of holes are drilled for the outlet of fluid from these chambers into the fluidized-bed. The vertical distance of the inlet holes from two neighboring chambers of the cap either equals or is smaller than one and one-half times the height of the heat exchanger situated in the particular fluidization bed formed between these two neighboring chambers of the same cap. The caps were used for the inlet of the combustion air into a fluidized-bed combustor, while the pressure drop of the lower part of the cap did not exceed 10% of the pressure drop of the upper part of the caps.

Abstract: The invention relates to the method for producing internally plasticized poly(vinyl chloride) suitable for the purposes of earth insulation and medical care. The production method according to the invention consists in the polymerization or copolymerization of vinyl chloride in an aqueous dispersion medium in the presence of up to 50 weight %, related to vinyl chloride, of a polymeric plasticizer prepared by polyesterification of dicarboxylic acids and diols. If desired, the polymerization can be carried out also in the presence of up to 12 weight % of alkyl esters of cyanuric acid and/or the copolymer of ethylene with vinyl acetate as the stabilizers of polymer-chain structure. The polymerization is carried out to the conversion of vinyl chloride 55 to 94% at temperature -20.degree. to +80.degree. C. in the presence of an emulsifier and the resulting polymer is isolated and worked up in the known way.

Abstract: The invention pertains to hydrophilic macroporous threedimensional copolymers of hydroxyalkyl methacrylates or hydroxyalkyl acrylates (C.sub.1 -C.sub.4 hydroxyalkyl) with crosslinking monomers which contain covalently attached saccharides via an O-glycosidic bond. The invention further pertains to the method of manufacturing of these copolymers by the direct reaction of the basic three dimensional copolymer containing hydroxyl groups with saccharides or their derivatives in an inert organic solvent under catalysis of HCl, BF.sub.3, or their mixtures at 20.degree.-100.degree. C. Saccharides and their derivatives are selected from the group comprising monosaccharides, oligosaccharides, deoxy sugars, amino saccharides, acylated saccharides, ether or halogen derivatives of monosaccharides and oligosaccharides, and the like.

Abstract: The invention relates to a solid insoluble carrier which is activated for bonding of nucleophilic groups and to a method of its preparation. The carrier contains active groups --O.CO.O.R, where R is the residue selected from the group comprising nitrophenyl, dinitrophenyl, trichlorophenyl, pentachlorophenyl, N-succinimidyl, N-phthalimidyl, and 8-quinolinyl. Active groups are bonded to polysaccharides, phenol-formaldehyde resins, polyacrylates, or polyacrylamides. The invention further relates to a method for preparation of the polymeric carrier, which consists in treatment of polymers carrying hydroxyl functions and selected from the group comprising polysaccharides, phenol-formaldehyde resins, polyacrylates, and polyacrylamides, with esters of chloroformic acid which contain the above mentioned active groups.

Abstract: The invention pertains to a method for preparation of polymers, grafted polymers, and copolymers from olefins substituted by polar groups (ester, nitrile, or aryl) or from dienes, wherein the polymerization is initiated by the system formed by mixing of an organic amide of alkaline metal with an alkaline metal alkoxide. The organic amide is derived from primary or secondary amines or polyamines, or from tertiary polyamines containing at least one primary or secondary amino group. These amines contain N-C or N-Si bonds, 1-4000 C atoms and 1-1000 N atoms in a molecula, or have the molecular weight below 100,000. The alkoxides are derived from C.sub.3 -C.sub.16 alcohols. The polymerizations are carried out at -80.degree. to +80.degree. C. (advantageously at +20.degree. C.), at the monomer/organic amide molar ratio 5-1500, at the molar ratio alkoxide/amide 0.5-10, and in hydrocarbon or ether solvents.

Abstract: This invention relates to a method for preparing globular, hydrophilic copolymers which have reticulated internal structures and are suitable for gas and gel chromatography. The method comprises polymerization by suspension polymerization methods of hydrophilic and hydrophilic monomers in aqueous medium in the presence of a component which prevents transfer of the hydrophilic monomer into the aqueous medium and the solubility of the aqueous medium in the monomeric phase.

Abstract: The use of long-acting oxytocin analogs, characterized chemically by replacement of the disulfide bridge by a thioether bridge, in safely inducing labor in mammals is disclosed. Of particular importance in the use of these compounds is the safety factor, that is, the absence of uterine tetany, dangerous to both mother and fetus, at dosage levels required for induction of complete labor. Induction of complete labor can be accomplished with one or, at most, two single injections.

Abstract: A single crystal of pure or mixed univalent mercury halide is formed having a first face perpendicular to the direction [A] which is inclined about the crystallographic direction [110] by an angle .alpha.. The crystal is simultaneously inclined from the crystallographic direction [110] about the direction [A] by an angle .beta. so that the two opposite faces for entrance and exit of the light wave are parallel to the direction [A] and [B]. The first face of the parallelepiped is provided with an acoustic wave.

Abstract: The specification describes the use of S or RS 9-(2, 3-dihydroxypropyl) adenine either alone or in combination with ara-A for the treatment of virus diseases.

Abstract: An unfoamed permeable material, which absorbs and desorbs moisture satisfactorily and which is suitable for making thin-walled articles having a maximum thickness of 3 mm, is based on plastic and/or rubber mixtures containing macromolecular hydrophilic fillers. The hydrophilic fillers are synthetic, water insoluble, cross-linked macromolecular materials containing pendent polar groups, which are able to bind water reversibly, e.g. hydroxy, amine, amide, carboxylic and sulfonic groups in H.sup.+, Na.sup.+, K.sup.+, Li.sup.+, Ca.sup.++, or Ba.sup.++ form, or quaternary ammonium groups in OH.sup.-, Cl.sup.- or HSO.sub.4.sup.- form.

Abstract: Substantially water-insoluble, water-swellable crosslinked hydrogels are prepared by polymerizing monomeric material consisting predominantly of acrylonitrile in aqueous salt solution containing zinc chloride as the main component, in absence of added crosslinking agents. The concentration of acrylonitrile is in the range of about 20 to about 40% by weight, related to the weight of the polymerization batch as a whole 100%. The process is carried out by partially hydrolyzing the primary gel thus obtained which consists of polyacrylonitrile plasticized with the aqueous salt solution, whereafter the zinc ions are removed from the gel by treating it with a dilute aqueous solution of at least one electrolyte forming an insoluble precipitate therewith. The partial hydrolysis may be carried out either by increasing the acidity of the solution or temperature or both.

Abstract: A fluidized-bed seal, formed by a vertical vessel divided with a baffle into two parts, closed at the upper end and having a fluidization grid situated at the lower end of the vessel, two vertical pipes which extend into the upper part of the vessel for inlet and outlet of particles and two pipes situated in the upper part of the vessel for inlet of secondary fluid, the cross sectional area of the fluidization grid being from 30 to 100% of the cross sectional area of the upper part of the vessel. The pipes for the inlet and outlet of particles extend into the upper part of the vessel from one to about three diameters of the pipes. The fluidized-bed seal can be used for continuous transport of cracking catalyst into the fluidization reactor.

Abstract: The invention relates to polymers and copolymers of pivaloyloxyalkyl methacrylates which contain structural units of the general formula ##STR1## where R.sup.1 is (CH.sub.2).sub.n.sbsb.1 --O (n.sub.1 =2 to 10) or (CH.sub.2 CH.sub.2 --O).sub.n.sbsb.2 (n.sub.2 =1 to 4) and to the method of their preparation and modification. The polymerization and copolymerization can be initiated by free-radical initiators of the peroxy type or by anionic initiators, e.g., alkali metal alkoxides or butyllithium, and carried out in a solution, bulk or suspension process in the presence of a crosslinking agent or without it. Anionic polymerization may result in stereoregular polymers or may be used for preparation of block copolymers by the "living" polymer technique. The polymers and copolymers can be modified by the partial or total conversion of the pivaloyloxyalkyl methacrylate units into hydroxyalkyl methacrylate units by selective hydrolysis, alcoholysis or other reaction.

Abstract: The invention pertains to a measuring set for determination of the sagittal depth and the average central curvature of soft contact lenses which consists of two measuring units based on the principle of depth gauges and the common electronic indication part. The apparatus serves for rapid and inexpensive selection of the correct contact lens according to the shape and peculiarities of the patient eye. Each measuring unit consists of a fixed part formed by a support plate, a stable conductive hollow screw, and a coaxially fitted conductor insulated from the screw and protruding above the insulation, and a movable part formed by a conductive nut bearing an insulation bushing for the protruding conductor and a scale and put on the screw.