Abstract: An optical fiber connection structure includes a first optical fiber and a second optical fiber each including plural cores and a cladding surrounding outer peripheries of the plural cores, the first optical fiber and the second optical fiber being connected to each other at end faces of the first optical fiber and the second optical fiber, arrangements of the plural cores of the first optical fiber and the second optical fiber matching each other at least partly.

Abstract: A blood glucose measurement device capable of measuring a blood glucose in the blood while suppressing the influence of light absorption by water in a living body. The blood glucose measurement device includes a light source that irradiates light having a wavelength selected from a wavelength band of 800 to 950 nm, and a sensor that receives light transmitted, reflected, or scattered in a living body and outputs information according to the amount of light received. A blood glucose acquisition unit acquires the blood glucose in the blood in the living body based on the information obtained by the sensor.

Abstract: An optical module includes: a substrate and a waveguide element having a mount face opposed to the substrate, the waveguide element having an interference waveguide portion having an optical interference function. Further, the mount face includes a projection region to which the interference waveguide portion is projected on the mount face and a non-projection region, and the waveguide element is joined to the substrate with a joint material in the non-projection region.

Abstract: An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy containing Fe: 0.005 to 1.800 mass % with the balance being Al and inevitable impurities, wherein a flatness change of the aluminum alloy disc blank for a magnetic disc when the aluminum alloy disc blank for a magnetic disc is held in the atmosphere at 50° C. or lower for 336 hours is 2.0 ?m or less.

Abstract: The vapor chamber includes a container having a hollow cavity and formed of one plate-shaped member and another plate-shaped member facing the one plate-shaped member that are layered on each other, a working fluid enclosed in the cavity, and a wick structure provided in the cavity. The wick structure includes a first wick part extending from a heat receiving part to a heat discharge part and having a first wick member using a linear member, and a second wick part provided to the heat receiving part and having a second wick member using a linear member. An average diameter the linear member of the second wick member is smaller than an average diameter of the linear member of the first wick member or an aperture dimension of the second wick member is smaller than an aperture dimension of the first wick member.

Abstract: A pressure sensor includes: a light source that outputs signal light; a sensor optical fiber where the signal light is input and the signal light is propagated with a loss of 0.3 dB/m or more; and an optical receiver that receives the signal light propagated through the sensor optical fiber. Further, pressure applied to the sensor optical fiber is detected on a basis of intensity of the signal light received by the optical receiver.

Abstract: A multicore fiber includes: a plurality of first linear portions including a first core portion, and a first cladding portion having a refractive index lower than a maximum refractive index of the first core portion, the first cladding portion surrounding an outer periphery of the first core portion; and a first tubular portion. The first linear portions are respectively joined to an inner wall of the first tubular portion, and two of the first linear portions are not in contact with each other in at least a portion in a longitudinal direction on a first virtual line connecting centers of two of the first core portions included in the two of the first linear portions, on a cross-section perpendicular to the longitudinal direction.

Abstract: An optical semiconductor device outputting a predetermined wavelength of laser light includes a quantum well active layer positioned between a p-type cladding layer and an n-type cladding layer in thickness direction. The optical semiconductor device includes a separate confinement heterostructure layer positioned between the quantum well active layer and the n-type cladding layer. The optical semiconductor device further includes an electric-field-distribution-control layer positioned between the separate confinement heterostructure layer and the n-type cladding layer and configured by at least two semiconductor layers having band gap energy greater than band gap energy of a barrier layer constituting the quantum well active layer. The optical semiconductor device is applied to a ridge-stripe type laser.

Abstract: A catalyst structure that allows prevention of aggregation of fine particles of a functional substance, suppresses decrease of catalyst activity, and thus enables extension of the lifetime of the catalyst structure. A catalyst structure has a carrier that is formed from a zeolite-type compound and has a porous structure. The functional substance includes a first element that is at least one metallic element selected from the group consisting of cobalt (Co), nickel (Ni), iron (Fe), and ruthenium (Ru), and at least one second element selected from the group consisting of metallic elements in group 1, group 2, group 4, group 7, and group 12 on the periodic table. The carrier has paths connected to each other. The functional substance is present in at least the paths of the carrier.

Abstract: An optical fiber includes: a core portion made of glass; and a cladding portion made of glass, having a refractive index lower than the refractive index of the core portion, and positioned on an outer periphery of the core portion. Further, the cladding portion has an outer diameter smaller than 100 ?m, and the core portion has a relative refractive-index difference of 0.32% to 0.40% with respect to the cladding portion.

Abstract: A sensing cable includes a first optical fiber, a second optical fiber that extends along the first optical fiber and that is spaced from the first optical fiber, and a transmitting material that includes an intervention portion present between the first optical fiber and the second optical fiber, the transmitting material being configured to transmit light from the first optical fiber to the second optical fiber through the intervention portion.

Abstract: An optical fiber includes: a core portion; and a cladding portion that has a refractive index lower than a maximum refractive index of the core portion and that surrounds an outer periphery of the core portion. The core portion includes a center core doped with germanium, and a low refractive index layer that surrounds an outer periphery of the center core, and in which ??max that is a minimum value of a relative refractive-index difference with respect to an average refractive index of the cladding portion is a negative value. A residual compressive stress in the center core is equal to or larger than 40 MPa and equal to or less than 150 MPa, and ?1 that is an average maximum relative refractive-index difference of the center core with respect to the average refractive index of the cladding portion is equal to or less than 0.8%.

Abstract: A heat sink including: a base portion to which a heat-generating element is thermally connected; a radiating fin provided on a front surface of the base portion; a heat pipe that is provided in an internal space of the base portion and stretches in a planar direction of the base portion; and a sealing member that is provided in the internal space of the base portion so as to face an end portion of the heat pipe in a longitudinal direction and seals the internal space of the base portion.

Abstract: An adhesive composition containing: an epoxy resin (A) having a fused ring structure; an epoxy resin curing agent (B); a polyrotaxane compound (C); and a polymer component (D), wherein the polyrotaxane compound (C) is contained in a content of 5 to 15 parts by mass based on total 100 parts by mass of contents of the epoxy resin (A) and the polymer component (D); a film adhesive using the adhesive composition; and a semiconductor package and a producing method thereof.

Abstract: An optical module includes: a substrate and a waveguide element having a mount face opposed to the substrate, the waveguide element having an interference waveguide portion having an optical interference function. Further, the mount face includes a projection region to which the interference waveguide portion is projected on the mount face and a non-projection region, and the waveguide element is joined to the substrate with a joint material in the non-projection region.

Abstract: Provided is a power cable and a method for manufacturing a power cable that reduces occurrence of uneven thickness of an insulating layer and voids and peeling due to shrinkage and has good dielectric breakdown strength. The power cable includes the insulating layer containing 15 mass % or more of a propylene-based resin having a melting point of 110° C. or higher with respect to a whole. The power cable further includes a relationship between a cooling rate X [° C./min] at the time of manufacturing an interface portion in the insulating layer with the inner semiconductive layer and a cooling rate Y [° C./min] at the time of manufacturing a central portion of the insulating layer and is expressed by the relationship (Z), wherein X?Y×0.8 . . . (Z).

Abstract: A harness-side connector includes a retaining portion main body having a harness-side terminal disposed therein, a shell main body, a harness insertion cylinder and a harness insertion outer cylinder. A retainer outserted over a portion, of a high-voltage electric wire that is inserted into the harness insertion cylinder and the harness insertion outer cylinder, to be secured is provided. The retainer includes a retainer securing portion inserted into the harness insertion outer cylinder to be secured, and an electric wire retaining portion protruding from the harness insertion outer cylinder and retaining the high-voltage electric wire. The electric wire retaining portion includes a securing-side retaining portion integrally formed with the retainer securing portion, and an attachment retaining portion attached to the securing-side retaining portion.

Abstract: An optical functional device includes: first and second optical couplers each including a multi-mode interferometer waveguide portion having a first end portion and a second end portion, two units of first input/output ports and two units of second input/output ports; and first and second arc-shaped waveguides each optically connecting one of the first and second input/output ports of the first and second optical coupler and one of the first and second input/output ports of the second optical coupler, respectively. Further, the first optical coupler, the second optical coupler, the first arc-shaped waveguide, and the second arc-shaped waveguide constitute a ring resonator, and each of the multi-mode waveguide portions of the first optical coupler and the second optical coupler have a narrow portion, an average width of the narrow portion in a longitudinal direction being narrower than widths at the first end portion and the second end portion.

Abstract: A rechargeable battery short-circuit early detection device that detects a short-circuit in a rechargeable battery includes one or more processors connected to a current sensor that detects a charging current of the rechargeable battery, wherein the one or more processors are programmed to: if a detected temporal slope of the charging current exceeds a first threshold, determine that there is a possibility that a short circuit has occurred in at least one of the cells; detect anew a temporal slope of the charging current after a prescribed period of time has elapsed since the determination of said possibility; and thereafter, if the anew detected temporal slope of the charging current exceeds a second threshold that is greater than the first threshold, determine that there is a possibility that the short-circuit is progressing, and output a signal indicating said possibility.

Abstract: A cooling device that can reduce heat resistance by improving a heat exchange action of a condensation tube, and can exhibit excellent cooling characteristics, and a cooling system using the cooling device are provided. The cooling device includes a container to which at least one heating element is thermally connected, a primary refrigerant sealed inside the container, a condensation tube through which a secondary refrigerant flows and which penetrates through a gaseous phase portion inside the container, and a porous member provided at an outer surface of the condensation tube.