Abstract: The Nb-Sn phase superconducting wire 15 elongating in the longitudinal direction and having a cross section including a core part and a shell part surrounding of the core part. The wire 15 includes a core part made of only bronze 17 and a shell part including: a matrix made of bronze 17; and Nb3Sn filaments 16 embedded in the bronze, wherein the Nb3Sn filaments 16 are radially arranged and electromagnetically and radially coupled to one another in the radius direction of the wire 15 in the surrounding of the core part, and wherein the Nb3Sn filaments 16 have larger diameters toward the outside, and the Nb3Sn filaments 16 are kept at spacing so as to electromagnetically isolated from one another in the circumferential direction of the wire 15.

Abstract: A precursor wire for the Nb—Sn phase superconducting wire includes a structure having a plurality of modules each composed by arranging a Sn-based metal core in a Cu-based metal matrix and the Nb-based metal filaments concentrically around the core is obtained by adjusting the amount of the Sn-based metal cores in each module to form the boundaries of the ?-phase bronze layers to be formed by reaction of Sn of the Sn-based metal cores and Cu-based metal matrix by the heat-treatment in the range including all of or a ratio of approximately not lower than 0.08 and not more than 0.32 of the existence region the Nb-based metal filaments.

Abstract: A method of producing Nb3Sn superconducting wire, including the steps of: preparing a plurality of Sn modules obtained by burying Sn-based metal cores in a Cu-based metal matrix and a plurality of Nb modules obtained by burying Nb-based metal filaments in a Cu-based metal matrix; bundling the Nb modules and the Sn modules such that the Nb modules surround the Sn modules and obtaining an assembly; inserting the assembly in a tubular member of Cu-based metal which internally comprises tube-like shaped Ta-based metal or Nb-based metal which serves as a diffusion barrier and obtaining a composite; drawing the composite; and heat-treating the composite.

Abstract: A lamp lighting device is arranged such that the optimum specifications of discharge lamps that may be mounted are integrated or entered in advance into a control circuit and the type of a discharge lamp mounted is manually or automatically presented to a microcomputer. This allows any of the discharge lamps to be driven under the optimum conditions at all times. As a result, lamp makers and lamp power can be selected relatively freely, making it possible to select discharge lamps by purpose. Furthermore, the cost, color, outgoing luminous flux and noise caused by a cooling fan can be set to user's better likings.

Abstract: A lamp lighting device is arranged such that the optimum specifications of discharge lamps that may be mounted are integrated or entered in advance into a control circuit and the type of a discharge lamp mounted is manually or automatically presented to a microcomputer. This allows any of the discharge lamps to be driven under the optimum conditions at all times. As a result, lamp makers and lamp power can be selected relatively freely, making it possible to select discharge lamps by purpose. Furthermore, the cost, color, outgoing luminous flux and noise caused by a cooling fan can be set to user's better likings.

Abstract: A method for manufacturing a Sn-based alloy containing a finely dispersed Sn—Ti compound includes melting Sn by heating to a temperature in a range from 1300 to 1500° C. in vacuum or an inert gas atmosphere, adding 0.1 to 5% by weight of Ti followed by melting by heating, and casting the molten alloy into a copper mold directly or through a pouring cup. The Sn-based alloy obtained by this method contains the Sn—Ti compound having a maximum particle diameter of 30 &mgr;m and a mean particle diameter of 5 to 20 &mgr;m. A precursor of a Nb3Sn wire is also obtained by an inner diffusion method using this Sn-based alloy. The Nb3Sn wire manufactured by using the Sn-based alloy of the present invention exhibits excellent superconductive characteristics. The method of the present invention enables the ingot to be free from a shrinkage cavity appearing during prior art manufacturing processes.

Abstract: A method for manufacturing a Sn based alloy containing a finely dispersed Sn-Ti compound by the steps comprising melting Sn by heating at 1300 to 1500° C in vacuum or under an inert gas atmosphere, adding 0.1 to 5% by weight of Ti followed by melting by heating, and casting the molten alloy into a copper mold directly or through a pouring cup. The Sn based alloy obtained by this method contains the Sn-Ti compound having a maximum particle diameter of 30 &mgr;m and mean particle diameter of 5 to 20 &mgr;m. A precursor of a Nb3Sn wire is also obtained by an inner diffusion method using this Sn based alloy. The Nb3Sn wire manufactured by using the Sn based alloy of the present invention exhibits excellent superconductive characteristics. The method of the present invention enables the ingot to be free from a shrinkage cavity appearing during the manufacturing process.

Abstract: A method of producing an Nb—Sn compound superconducting wire precursor includes forming composite filament materials, each filament including a niobium material of an Nb-based metal and a titanium material of pure Ti enveloped in the niobium material; forming a composite rod in which composite filament materials are arranged in a matrix of a Cu-based metal but not in contact with one another, the matrix containing Sn diffused by heat treatment to combine with the niobium material to form a compound; and drawing the composite rod.

Abstract: An Nb—Sn compound superconducting wire precursor comprising a matrix of a Cu-base metal, a plurality of composite filaments each composed of a niobium layer of an Nb-base metal and a titanium layer of pure Ti formed so as to be enveloped in the inside of the niobium layer, and Sn diffused in the matrix by heat treatment so as to be combined with the niobium layer to form a compound, the plurality of composite filaments being embedded in the matrix so as not to be in contact with one another.

Abstract: An Nb—Sn compound superconducting wire precursor comprising a matrix of a Cu-base metal, a plurality of composite filaments each composed of a niobium layer of an Nb-base metal and a titanium layer of pure Ti formed so as to be enveloped in the inside of the niobium layer, and Sn diffused in the matrix by heat treatment so as to be combined with the niobium layer to form a compound, the plurality of composite filaments being embedded in the matrix so as not to be in contact with one another.

Abstract: A compound superconducting wire comprising a matrix of CuX alloy and a multiplicity of Z.sub.3 X filaments embedded in the matrix in a spaced relationship so as not to come into contact with each other wherein X is Sn or Ga and Z.sub.3 X is Nb.sub.3 Sn or V.sub.3 Ga. In a precursor, therefore, a multiplicity of filaments of a base metal material Z such as Nb are arranged in a Cu base metal matrix concentrically in layers around a center core of a base metal material X such as Sn, in which the spacing between any adjacent filaments arranged in a former boundary region of an .epsilon.-phase bronze layer having a certain radius from the center produced when the precursor is preheat-treated at a temperature of 300.degree. to 600.degree. C. is made larger than the spacing between any adjacent filaments arranged in the other matrix regions.

Abstract: A compound superconducting wire comprising a matrix of CuX alloy and a multiplicity of Z.sub.3 X filaments embedded in the matrix in a spaced relationship so as not to come into contact with each other wherein X is Sn or Ga and Z.sub.3 X is Nb.sub.3 Sn or V.sub.3 Ga. In a precursor, therefore, a multiplicity of filaments of a base metal material Z such as Nb are arranged in a Cu base metal metrix concentrically in layers around a center core of a base metal material X such as Sn, in which the spacing between any adjacent filaments arranged in a former boundary region of an .epsilon.-phase bronze layer having a certain radius from the center produced when the precursor is preheat-treated at a temperature of 300.degree. to 600.degree. C. is made larger than the spacing between any adjacent filaments arranged in the other matrix regions.

Abstract: A process for preparing a superconducting wire having improved superconducting characteristics in shortened period of time at a reduced cost, which comprises the steps of forming a plurality of holes in each of Cu base metal plates, stuffing the plates in a supporting container to form a stacked body of the plates with their holes aligned with each other, stuffing a superconductor or a material convertible into a superconductor by a heat treatment into the resulting through-holes of the stacked body, evacuating and sealing the supporting container to form a composite billet, and processing the composite billet in a usual manner to give a superconducting wire.

Abstract: An improved method for producing superconductive oxide substance, wherein a solution containing therein a plurality of elements to constitute the superconductive oxide substance is atomized into mists, then the thus atomized mists are transported on a carrier gas into a chemical reaction device, and, after the chemical reaction in this chemical reaction device, the superconductive oxide substance is deposited on a substrate in a desired shape, with further heat-treatment of the thus deposited superconductive oxide substance in an oxygen-containing atmosphere at a temperature ranging from 200.degree. C. to 1,200.degree. C.

Abstract: The present invention is designated to solve such problems whereby a process for producing a PbMo.sub.6 S.sub.8 type compound superconductor excellent in stoichiometric composition and electric characteristics can be provided.In addition to the above, another purpose of the present invention is to provide a process for producing a PbMo.sub.6 S.sub.8 type compound superconductor with stable electrical characteristics.