Abstract: A method for manufacturing a wire includes: preparing a tubular outer layer body including a magnetic metal containing iron; preparing a metal core body having an outer diameter that is 85.1% or more and 99.4% or less of an inner diameter of the tubular outer layer body; mechanically polishing an inner surface of the tubular outer layer body and an outer surface of the metal core body; treating at least one of the inner surface of the tubular outer layer body and the outer surface of the metal core body with hydrochloric acid; obtaining a preform by disposing the metal core body inside the tubular outer layer body; and obtaining a wire by drawing the preform through a wire drawing die.

Abstract: A heat exchanger 10 to be used in a magnetic heat pump device includes: an assembly 11 which is formed by bundling wires 12; a case 13 which accommodates the assembly 11 and is provided with at least one cutout 145 or 146; and a filling portion 16 which is filled in the cutout 145 or 146, in which the wire 12 is formed of a magnetocaloric material having a magnetocaloric effect and the filling portion 16 is in close contact with an outer periphery of the assembly 11.

Abstract: [Object] To provide a wire capable of obtaining a wide temperature span. [Solving Means] An outer surface 121 of a wire 12A formed of a magnetocaloric material having a magnetocaloric effect partially has at least one of a concave portion 122 and a convex portion 123, the concave portion 122 is recessed in a radial direction of the wire 12A, and the convex portion 123 protrudes in the radial direction in a longitudinal direction of the wire 12A.

Abstract: Provided is a gadolinium wire rod including gadolinium as a main component and having a Vickers hardness (HV) 120 or less.

Abstract: Provided is a metal-covered gadolinium wire rod including: a gadolinium wire including gadolinium as a main component, as a core; and a clad layer including, as a main component, a metal other than gadolinium, the clad layer covering the periphery of the core.

Abstract: Provided is a gadolinium wire rod including gadolinium as a main component, wherein the average particle size of a segregated phase containing fluorine atom and/or chlorine atom is 2 ?m or less. The present invention can provide a gadolinium wire rod high in strength and excellent in processability.

Abstract: Provided is an MCM heat exchanger 10 including linear bodies formed of a magnetocaloric material having a magnetocaloric effect and a case 13 filled with the linear bodies, in which each of the linear bodies is a stranded wire 12 obtained by twisting at least two wires 121.

Abstract: Provided is a heat exchanger 10 including: wires 121 formed of a magnetocaloric material having a magnetocaloric effect; and a case 13 filled with the wires 121, wherein a wire diameter of the wire 121 is smaller than 1 mm. According to the invention, it is possible to provide a heat exchanger capable of improving a heat exchange efficiency without causing an increase in size of a device.

Abstract: Displacement measuring device with light irradiation system, first and second FBGs and detecting system. The first FBG has first transmittance distribution or first reflectance distribution. The second FBG has second transmittance distribution or second reflectance distribution. The detecting system detects light passed through the first and second FBGs of which at least one of the first transmittance distribution and the second transmittance distribution changes in a wavelength direction with a change amount different from that of the other, according to a displacement amount of an object, or amplitude of the light passed through the first and the second FBGs of which at least one of the first reflectance distribution and the second reflectance distribution changes in the wavelength direction with a change amount different from that of the other, according to the displacement amount of the object, and acquires an index to indicate the displacement amount based on the amplitude.

Abstract: Displacement measuring device with light irradiation system, first and second FBGs and detecting system. The first FBG has first transmittance distribution or first reflectance distribution. The second FBG has second transmittance distribution or second reflectance distribution. The detecting system detects light passed through the first and second FBGs of which at least one of the first transmittance distribution and the second transmittance distribution changes in a wavelength direction with a change amount different from that of the other, according to a displacement amount of an object, or amplitude of the light passed through the first and the second FBGs of which at least one of the first reflectance distribution and the second reflectance distribution changes in the wavelength direction with a change amount different from that of the other, according to the displacement amount of the object, and acquires an index to indicate the displacement amount based on the amplitude.