Abstract: A precursor for a Nb3Sn superconductor wire to be manufactured by the internal diffusion method, includes a plurality of Nb-based single core wires, each of which includes a Nb-based core coated with a Cu-based coating including a Cu-based matrix, a plurality of Sn-based single core wires, each of which includes a Sn-based core coated with a Cu-based coating including a Cu-based matrix; and a cylindrical diffusion barrier including Ta or Nb, in which the plurality of Nb-based single core wires and the plurality of Sn-based single core wires are regularly disposed, wherein the plurality of Nb-based single core wires include Nb-based single core wires having a Cu/Nb ratio of 0.4 or more, wherein the Cu/Nb ratio is a cross sectional area ratio of the Cu-based coating to the Nb-based core.

Abstract: A precursor for a Nb3Sn superconductor wire to be manufactured by the internal diffusion method, includes a plurality of Nb-based single core wires, each of which includes a Nb-based core coated with a Cu-based coating including a Cu-based matrix, a plurality of Sn-based single core wires, each of which includes a Sn-based core coated with a Cu-based coating including a Cu-based matrix; and a cylindrical diffusion barrier including Ta or Nb, in which the plurality of Nb-based single core wires and the plurality of Sn-based single core wires are regularly disposed, wherein the plurality of Nb-based single core wires include Nb-based single core wires having a Cu/Nb ratio of 0.4 or more, wherein the Cu/Nb ratio is a cross sectional area ratio of the Cu-based coating to the Nb-based core.

Abstract: A precursor for a Nb3Sn superconductor wire to be manufactured by the internal diffusion method. The precursor includes Nb-based single core wires, Sn-based single core wires, and a cylindrical diffusion barrier made of Ta or Nb. Each Nb-based single core wire includes a Nb-based core coated with a Cu-based coating made of a Cu-based matrix. Each Sn-based single core wire includes a Sn-based core coated with a Cu-based coating made of a Cu-based matrix. The Nb-based single core wires and the Sn-based single core wires are regularly disposed in the diffusion barrier. The Nb-based single core wires includes at least two kinds of Nb-based single core wires having different Cu/Nb ratios and the Cu/Nb ratio is a cross sectional area ratio of the Cu-based coating to the Nb-based core.

Abstract: An Nb3Sn superconductor wire is manufactured by heating a precursor for an Nb3Sn superconductor wire. The precursor includes a Cu tube made of Cu or Cu-alloy, assemblies, each of which includes Nb filaments disposed in the Cu tube, and each of the Nb filaments includes an Nb core made of Nb or Nb-alloy. Each of the assemblies also includes Sn filaments disposed in the Cu tube, and each of the Sn filaments includes a Sn core made of Sn or Sn-alloy. The precursor also includes reinforcing filaments disposed in the Cu tube for dividing the assemblies such that the assemblies are not adjacent to each other. By heating the precursor, Sn in the Sn core is diffused into the Nb core to produce Nb3Sn.

Abstract: A physical construction of a superconducting multi-core billet is provided together with a method for manufacturing a superconducting multi-core wire to offer reduction of manufacturing time (cost) and low frequency of occurrence of wire break during diameter-reduction drawing. The superconducting multi-core billet by the present invention has such a construction that a plurality of vertical holes are made in a billet 2 of copper or copper alloy of circular cross-section; that the vertical holes are filled with a superconducting material 4 comprised of NbTi; that a copper-volume ratio, which is a ratio of the copper or the copper alloy to NbTi in volume, is not smaller than four; that the plurality of vertical holes are made in the billet so that each of the vertical holes will be arrayed at an equal spacing on each of two inner and outer layers concentric circles.

Abstract: A method of producing a Nb3Sn superconducting wire rod includes forming a wire rod comprising Nb, Sn and Cu, and having a mole ratio of the Sn expressed as ax+b(1?x), where 0.25?x?0.8, 0.3?a?0.4 and 0.02?b?0.1, and x and 1?x are prescribed as a mole ratio of the Nb and a mole ratio of the Cu, respectively, to a total of a mole number of the Nb and a mole number of the Cu, and heating the wire rod to produce Nb3Sn from the Sn and the Nb. By the heating of the wire rod, a Cu—Sn alloy is produced from the Sn and the Cu, concurrently with the Nb3Sn produced from the Sn and the Nb.

Abstract: A precursor for a Nb3Sn superconductor wire to be manufactured by the internal diffusion method. The precursor includes Nb-based single core wires, Sn-based single core wires, and a cylindrical diffusion barrier made of Ta or Nb. Each Nb-based single core wire includes a Nb-based core coated with a Cu-based coating made of a Cu-based matrix. Each Sn-based single core wire includes a Sn-based core coated with a Cu-based coating made of a Cu-based matrix. The Nb-based single core wires and the Sn-based single core wires are regularly disposed in the diffusion barrier. The Nb-based single core wires includes at least two kinds of Nb-based single core wires having different Cu/Nb ratios and the Cu/Nb ratio is a cross sectional area ratio of the Cu-based coating to the Nb-based core.

Abstract: A precursor for a Nb3Sn superconductor wire is configured to be manufactured by the internal Sn diffusion method. The precursor includes a Cu tube including a barrier layer at an inner surface thereof. The barrier layer includes a metal selected from the group consisting of Ta, Ta-alloy, Nb and Nb-alloy. A plurality of Sn single cores are disposed in the Cu tube. Each of the Sn single cores includes Sn or Sn-alloy. A plurality of Nb single cores are also disposed in the Cu tube. Each of the Nb single cores includes Nb or Nb-alloy. The Sn single cores and the Nb single cores are arranged in the Cu tube such that the Sn single cores are not adjacent to each other.

Abstract: A method of producing a Nb3Sn superconducting wire rod includes forming a wire rod comprising Nb, Sn and Cu, and having a mole ratio of the Sn expressed as ax+b(1?x), where 0.25?x?0.8, 0.3?a?0.4 and 0.02?b?0.1, and x and 1?x are prescribed as a mole ratio of the Nb and a mole ratio of the Cu, respectively, to a total of a mole number of the Nb and a mole number of the Cu, and heating the wire rod to produce Nb3Sn from the Sn and the Nb. By the heating of the wire rod, a Cu—Sn alloy is produced from the Sn and the Cu, concurrently with the Nb3Sn produced from the Sn and the Nb.

Abstract: A method of making a Nb3Sn-based superconducting wire has: providing a drawn wire having a sub-element wire that a plurality of filaments having niobium (Nb) or an niobium alloy are disposed in a bronze material having a copper (Cu)-tin (Sn)-based alloy material; and a heat treatment step of heating the drawn wire to generate a Nb3Sn-based superconducting phase in the sub-element wire. The heat treatment step has heating the drawn wire at a rate of temperature rise of 0.5 to 10° C./hour and with a temperature width of 30 to 200° C.

Abstract: An Nb3Sn-based superconductive wire which, when used in a superconductive magnet, manifests sufficient strength also against force along the radius direction in operating the magnet and reveals little deterioration in properties due to mechanical strain ascribable to the force along the radius direction is provided. An Nb3Sn-based superconductive wire comprising a bronze/filament aggregate obtained by placing a lot of niobium (Nb) or niobium alloy filaments in a copper (Cu)-tin (Sn)-based alloy matrix, wherein said niobium or niobium alloy filament constituting the bronze/filament aggregate 3? is a composite filament 5 obtained by combining with a filament reinforcing material having mechanical strength under temperature not more than room temperature after thermal treatment for producing an Nb3Sn-based superconductive compound, larger than the mechanical strength of the niobium or niobium alloy.

Abstract: An Nb3Sn-based superconductive wire which, when used in a superconductive magnet, manifests sufficient strength also against force along the radius direction in operating the magnet and reveals little deterioration in properties due to mechanical strain ascribable to the force along the radius direction is provided. An Nb3Sn-based superconductive wire comprising a bronze/filament aggregate obtained by placing a lot of niobium (Nb) or niobium alloy filaments in a copper (Cu)-tin (Sn)-based alloy matrix, wherein said niobium or niobium alloy filament constituting the bronze/filament aggregate 3′ is a composite filament 5 obtained by combining with a filament reinforcing material having mechanical strength under temperature not more than room temperature after thermal treatment for producing an Nb3Sn-based superconductive compound, larger than the mechanical strength of the niobium or niobium alloy.

Abstract: This invention relates to a process for preparing bisphenol A by the condensation of phenol with acetone in the presence of cation exchange resin obtained by sulfonating copolymers of monovinyl monomers mainly consisting of styrenes and divinyl monomers as crosslinking agent while using divinylbiphenyl and divinylbenzene mainly as said divinyl monomers and controlling the molar ratio of divinylbiphenyl to divinylbenzene at 10/0-2/8. The cation exchange resin to be used as catalyst in the condensation reaction shows a long life, maintains the production of bisphenol A over a long period of time, possesses high strength and is useful for economical and advantageous production of bisphenol A.

Abstract: A miniature bulb assembly adapted to be mounted on a base board includes a socketless miniature bulb, a base portion molded of synthetic resin and a pair of terminal members. The miniature bulb is received in a bulb receiving hole at the central part of the base portion while a pair of lead wires extending from the miniature bulb are inserted through lead wire holes on the bottom wall of the base portion. Each terminal member comprises an elongated plate-shaped terminal and a base fitting portion, both of which are integrated with the base portion during a molding operation. The lead wires are connected to tongue-shaped pieces projecting from lead wire connection tabs in a clamped state. The base portion may be formed with T-shaped terminal insert holes on the opposite sides thereof such that terminal members each having a disengagement preventive tapered portion are tightly inserted thereinto from the above.

Abstract: A miniature bulb assembly adapted to be mounted on a base board includes a socketless miniature bulb, a base portion molded of synthetic resin and a pair of terminal members. The miniature bulb is received in a bulb receiving hole at the central part of the base portion while a pair of lead wires extending from the miniature bulb are inserted through lead wire holes on the bottom wall of the base portion. Each terminal member comprises an elongated plate-shaped terminal and a base fitting portion, both of which are integrated with the base portion during a molding operation. The lead wires are connected to tongue-shaped pieces projecting from lead wire connection tabs in a clamped state. The base portion may be formed with T-shaped terminal insert holes on the opposite sides thereof such that terminal members each having a disengagement preventive tapered portion are tightly inserted thereinto from the above.

Abstract: This invention provides an attachment structure of a car sound apparatus of the type in which an inner case is fitted in an opening of a dashboard panel and the car sound apparatus is inserted through an insertion hole of the inner case and attached there, which is characterized in that pin fitting portions are provided on the front ends of the side faces of the inner case each comprising an inclined edge and a fitting groove, and lock pin units are provided on the side faces of the car sound apparatus each allowing up and down movement of its lock pin, wherein at the time of attaching the car sound apparatus to the inner case the lock pin moves along the inclined edge and fits in the fitting groove of the pin fitting portion, whereas at the time of detachment the lock pin is moved upward by means of a removing member to release engagement with the fitting groove to thereby permit pulling out.

Abstract: A tar-urethane composition comprising (1) an isocyanate-reactive tar obtained by reacting a tar produced as a by-product in the phenol synthesis via hydroperoxides with a formaldehyde in the presence of a basic catalyst and in the presence or absence of at least one phenol compound and (2) a polyisocyanate, which is useful as coating agents, materials for pavement, floor linings, sealing materials and the like.