Abstract: A final polishing composition for polishing a silicon wafer used as a substrate crystal in electrical integrated circuits comprises water, colloidal silica, a water-soluble polymeric compound, and a water-soluble salt.

Abstract: There is disclosed an electron shower apparatus which eliminates the adverse effect of a magnetic field on electrons and which provides electrons in sufficient quantity when primary electrons having low energy are employed. In the apparatus, the magnetic field generated by a filament current is decreased or eliminated by pulsing the filament current or by passing a current opposite in direction to the filament current in the vicinity of the filament current.

Abstract: A method is provided for preventing agglomeration of a colloidal silica comprising trialkylsilyating part of silanol groups on the surface of silica particles of the colloidal silica with a trialkylhalosilane or a hexaalkyldisilazane in an amount from about 0.1-10 mole % based on the silanol groups on the surface of the silica particles.

Abstract: The present invention relates to an immunosuppressive agent which comprises at least one compound selected from the compounds of formula ##STR1## wherein R represents a hydrogen atom or an acyl, Y represents carbonyl or hydroxymethylene and represents a single bond or a double bond and their lactones, in an effective amount and a pharmaceutically acceptable carrier; a method of prophylaxis and therapy for suppressing rejection or autoimmune diseases which comprises administering the above-mentioned compound or its lactone in an effective amount; and a novel compound of formula ##STR2## or its lactone.

Abstract: A process for producing high purity silicic acid aqueous solution is disclosed, wherein alkali metals in an alkali silicate solution are removed by ion-exchanging, the resulting solution is treated in an electrochemical process in the present of a strong acid and oxidizing agent to solubilize the remaining non-alkali metal salts, and the non-alkali metals in the water soluble salts are removed by ion-exchanging to obtain the silicic acid aqueous solution.

Abstract: An ion implantation apparatus includes an ion source having an arc chamber generating ions and a drawing electrode drawing ions from the arc chamber, a mass separator transporting only ions desired for implantation, an ion implantation chamber in which the material to be implanted by ions is placed, and a controller means for automatically controlling the distance between the arc chamber and the drawing electrode incrementally in accordance with a theoretical calculation using normalized perveance considering the kind of ions to be implanted, the accelerating voltage, and the ion current and current density distribution.

Abstract: There are disclosed 2-aminopentanoic acid compounds represented by the formula ##STR1## wherein R is as defined in the specification, their optical isomers, their pharmacologically acceptable salts and their use as an immunosuppressant.

Abstract: A high-activity nickel type catalyst, which comprises a carrier compound of high-purity ultra-fine single-crystal magnesia having an average particle size of 100 to 2000 .ANG. or a BET specific surface area of 6 to 170 m.sup.2 /g and metallic nickel or nickel oxide uniformly and thoroughly dispersed on the surface of the carrier in a supported amount of 0.1 to 50% by weight as metallic nickel. The catalyst exhibits a high activity in the steam reforming of hydrocarbons, methanation of synthesis gases, and hydrogenation of cyclic and alicyclic unsaturated hydrocarbons.

Abstract: An ion implantation apparatus comprises an ion beam measuring device to measure and analyze the shape of a beam projected on a substrate for ion implantation and the quantity of current obtained by the ion beam, an analyzing slit member having an opening whose width is changeable, which is located in the ion beam track to extract only implantation ions, and a shaping slit member having an opening whose width is changeable, which is located behind the analyzing slit member to determine the shape of the beam to be projected on the substrate for ion implantation, wherein the widths of the openings of the analyzing slit member and the shaping slit member are changed on the basis of the shape of the beam and the quantity of current obtained as a result of the measurement by the ion beam measuring device.

Abstract: A charged-particle distribution measuring apparatus includes a particle passing member having a plurality of through-holes through which portions of a beam of charged particles can pass, a particle trapping member for trapping charged particles that have passed through the through-holes, a recoil particle trapping member disposed between the particle passing member and the particle trapping member, and a mechanism for moving the members to measure the spatial distribution of the charged particle beam. Preferably, the through-holes in the particle passing member are uniformly distributed in a checkerboard pattern. The movement of the members permits measurement of the currents produced by the charged particle beam at various intervals between the locations of the through-holes at the beginning of the measurement. The measurement of the charged particle beam intensity at positions across through the beam, rather than at fixed locations within the beam, improves the resolution of the measured distribution.

Abstract: A fine polishing composition for wafers, comprising water, particulate amorphous silica and a polysaccharide polymer graft-polymerized with acrylamide alone or together with at least one vinyl monomer selected from the group consisting of acrylic acid, methacrylic acid and styrenesulfonic acid, and adjusted with an alkaline substance to a pH of from 8 to 12.

Abstract: In an ion beam irradiating apparatus for providing a neutralized ion beam to a sample, there are provided an ion source, an accelerating device and an ion beam selecting device to which the accelerated and selection ion beam is irradiated.

Abstract: In an ion beam irradiating apparatus, a specified ion beam is first deflected in a deflection direction perpendicular to an ion beam orbit by an ion beam deflector. The deflected ion beam is neutralized by a thermoelectron beam emitted from a filament of an ion neutralizer. An electrode is employed to control the supply of the thermoelectron beam to the deflected ion beam. Both the filament and control electrode elongated along the deflection direction surround the deflected ion beam traveled along the ion beam orbit.

Abstract: In a tape cartridge of the Philips type, one or more ribs are projected from a main plate of each case half at regions except for the tape chamber and the tape path so as to conform to one or more flow lines of resin when each half of molded, the cartridge is so that the formation of traces of resin can be prevented, resulting in an increase in mechanical strength of the cartridge.

Abstract: A hub assembly for use in a recording tape cartridge is composed of an inner body and an outer ring formed around the inner body so as to decrease distortion on the out-of roundness and the verticality of the outer cylindrical surface of the hub assembly.

Abstract: In a tape cartridge of the type having a front lid for protection of the tape and the position thereof in a tape player is decided by a positioning member of the tape player, a reference face of the tape cartridge to which the positioning member of the tape player abuts is provided on the front end portion of the side wall of the cartridge so as to avoid interference with the front lid and the positioning member and to avoid the need for providing an opening in the front lid for passing the positioning member.

Abstract: An additive for continuous casting of steel comprising as a base material a neutral to basic amorphous fluorine-containing calcium silicate containing up to 10% by weight R.sub.2 O.sub.3, wherein R represents Al and F, and up to 1.5% by weight P.sub.2 O.sub.5 ; this additive prevents surface defects on billets and final products derived therefrom in continuous casting.

Abstract: A hub for use in a magnetic recording tape cassette comprising an engagement recess defined in the cylindrical peripheral surface of the hub and a clamp piece having a pair of elastically deformable lugs. When the clamp piece is fitted in the engagement recess with the magnetic recording tape inserted therebetween, the tape is secured on the hub by clamping the tape between the free ends of the lugs and the side walls of the engagement recess.

Abstract: A fire brick unit or assembly is proposed which has a pile of fire bricks laid one upon another on a supporting member to facilitate the building and dismantling of industrial furnaces. It further includes suspending members on which can be lifted with a crane or the like. There is no necessity of laying or removing fire bricks one by one.

Abstract: A magnetic recording tape cartridge of a Phillips type which comprises a slip sheet for assuring uniformity of the winding of a tape pack on a hub, said slip sheet being provided with at least three embossed convex ribs of special material radially extended with respect to a pair of drive shaft inserting holes, each of said ribs having closed ends said ribs being disposed on the slip sheet in the positions and the directions specially defined so as to prevent fluctuation of the hub and the tape pack during winding the magnetic recording tape in said cartridge.