Abstract: In the method for producing a polyether compound of the present invention, an oxirane monomer is polymerized with a trialkylaluminum and a non-halogen-containing onium salt to produce a polyether compound.

Abstract: The refrigerator oil of the present invention contains an oxygen-containing base oil and a viscosity index improver, and has a viscosity index (VI) of 200 or more and a volume resistivity of 1×109 ?m or more.

Abstract: According to one embodiment, a disk device includes a disk-shaped recording medium, a head which processes data on the recording medium, and a housing accommodating the recording medium and the head. The housing includes a base with a side wall, and a cover having a welded portion welded to the side wall by laser welding. The welded portion includes a first welded portion welded to a first region of the side wall and having weld beads with a first shape, and a second welded portion welded to a second region of the side wall and having welded beads with a second shape different from the first shape.

Abstract: According to one embodiment, a disk device includes a disk-shaped recording medium, a head which processes data on the recording medium, and a housing accommodating the recording medium and the head. The housing includes a base with a side wall, and a cover having a welded portion welded to the side wall by laser welding. The welded portion includes a first welded portion welded to a first region of the side wall and having weld beads with a first shape, and a second welded portion welded to a second region of the side wall and having welded beads with a second shape different from the first shape.

Abstract: According to one embodiment, a disk device includes a housing and a sealing board fixed to a base of the housing. The base includes a through-hole and an installation surface formed around the through-hole. One of a first principal surface of the sealing board and the installation surface includes a projection formed therein. The sealing board is fixed to the installation surface by an adhesive material provided on an outer side of the projection with respect to the through-hole with the first principal surface or the installation surface abutting against the projection.

Abstract: According to one embodiment, a disk device includes a housing and a sealing board fixed to a base of the housing. The base includes a through-hole and an installation surface formed around the through-hole. One of a first principal surface of the sealing board and the installation surface includes a projection formed therein. The sealing board is fixed to the installation surface by an adhesive material provided on an outer side of the projection with respect to the through-hole with the first principal surface or the installation surface abutting against the projection.

Abstract: According to one embodiment, a disk device includes a disk-shaped recording medium, a head which processes data on the recording medium, and a housing accommodating the recording medium and the head. The housing includes a base with a side wall, and a cover having a welded portion welded to the side wall by laser welding. The welded portion includes a first welded portion welded to a first region of the side wall and having weld beads with a first shape, and a second welded portion welded to a second region of the side wall and having welded beads with a second shape different from the first shape.

Abstract: According to one embodiment, a disk device includes a rotatable disk-shaped recording medium, an actuator supporting a head to be movable with respect to the recording medium, and an enclosure includes a base accommodating the recording medium and the actuator, and a cover fixed to the base and includes a peripheral edge portion including a welded portion laser-welded to the base. The welded portion includes weld beads arranged along the entire peripheral edge portion of the cover, and the weld beads include at least two circular weld beads in the peripheral edge portion of the cover.

Abstract: According to one embodiment, a disk device includes a rotatable disk-shaped recording medium, an actuator supporting a head to be movable with respect to the recording medium, and an enclosure includes a base accommodating the recording medium and the actuator, and a cover fixed to the base and includes a peripheral edge portion including a welded portion laser-welded to the base. The welded portion includes weld beads arranged along the entire peripheral edge portion of the cover, and the weld beads include at least two circular weld beads in the peripheral edge portion of the cover.

Abstract: A resin composition comprising a modified ethylene-vinyl alcohol copolymer (A) and an unmodified ethylene-vinyl alcohol copolymer (B), wherein the modified ethylene-vinyl alcohol copolymer (A) is represented by a following formula (I), contents (mol %) of a, b, and c based on the total monomer units satisfy following formulae (1) to (3), and a degree of saponification is not less than 80 mol %, thereby providing a resin composition that is excellent in a barrier property, impact resistance, and secondary processability and moreover excellent in productivity. 18?a?55??(1) 0.01?c?20??(2) [100?(a+c)]×0.9?b?[100?(a+c)]??(3).

Abstract: Provided is a modified ethylene-vinyl alcohol copolymer, wherein the copolymer is represented by a following formula (I), contents (mol %) of a, b, and c based on the total monomer units satisfy following formulae (1) through (3), and a degree of saponification (DS) defined by a following formula (4) is not less than 90 mol %, 18?a?55??(1) 0.01?c?20??(2) [100?(a+c)]×0.9?b?[100?(a+c)]??(3) DS=[(Total Number of Moles of Hydrogen Atoms in X, Y, and Z)/(Total Number of Moles of X, Y, and Z)]×100??(4).

Abstract: An electronic module is provided with a circuit board including a central-axis insertion hole and composed by laminating a multitude of wiring layers; and a core formed of a magnetic material and inserted through the central-axis insertion hole, wherein the circuit board includes a plurality of coil wiring patterns formed in positions of the respective wiring layers surrounding the core insertion hole; and edge-face through-holes formed on inner wall surfaces of the central-axis core insertion hole to electrically connect the plurality of coil wiring patterns to form a coil, the central-axis insertion hole has a octagon shape in plan view, concave portions are disposed on the inner wall surfaces corresponding to sides of the octagon shape, and the edge-face through-holes are formed in the concave portions.

Abstract: The object of the present invention is to provide a method of producing low valence titanium oxides in a steady supply manner acceptable in industrial production. The low valence titanium oxides are produced by electrical discharge between two electrodes in an aqueous medium, wherein at least one of the electrodes is a titanium-containing electrode.

Abstract: Provided is a modified ethylene-vinyl alcohol copolymer, wherein the copolymer is represented by a following formula (I), contents (mol %) of a, b, and c based on the total monomer units satisfy following formulae (1) through (3), and a degree of saponification (DS) defined by a following formula (4) is not less than 90 mol %, 18?a?55??(1) 0.01?c?20??(2) [100?(a+c)]×0.9?b?[100?(a+c)]??(3) DS=[(Total Number of Moles of Hydrogen Atoms in X, Y, and Z)/(Total Number of Moles of X, Y, and Z)]×100??(4).

Abstract: A method for producing a diester of polyhydric alcohol and fatty acid, comprising a step of reacting a monoester of polyhydric alcohol and fatty acid in the presence of a catalyst containing a hydrotalcite compound to obtain a diester of polyhydric alcohol and fatty acid.

Abstract: An object of the present invention is to provide a production process of an ?-hydroxy acid having a sufficient quality as a polymer raw material, which process does not produce a large amount of waste as a byproduct and is economical. The present invention provides a production process of an ?-hydroxy acid having a step of adding a basic metal to an ?-hydroxy acid ammonium salt to yield an ?-hydroxy acid metal salt and a step of desalting the ?-hydroxy acid metal salt to yield the ?-hydroxy acid.

Abstract: A method for producing a diester of polyhydric alcohol and fatty acid, comprising a step of reacting a monoester of polyhydric alcohol and fatty acid in the presence of a catalyst containing a hydrotalcite compound to obtain a diester of polyhydric alcohol and fatty acid.

Abstract: A method of producing a Group II-VI compound semiconductor. The method involves generating a pulsed electrical discharge plasma between metallic electrodes in sulfur to produce a Group II-VI compound semiconductor. A method of producing a Group II-VI compound semiconductor phosphor using a pulsed electrical discharge plasma. A hexagonal crystal of Group II-VI compound semiconductor composed of a plurality of twin crystals.

Abstract: The object of the present invention is to provide a method of producing low valence titanium oxides in a steady supply manner acceptable in industrial production. The low valence titanium oxides are produced by electrical discharge between two electrodes in an aqueous medium, wherein at least one of the electrodes is a titanium-containing electrode.

Abstract: An object of the present invention is to provide a production process of an ?-hydroxy acid having a sufficient quality as a polymer raw material, which process does not produce a large amount of waste as a byproduct and is economical. The present invention provides a production process of an ?-hydroxy acid having a step of adding a basic metal to an ?-hydroxy acid ammonium salt to yield an ?-hydroxy acid metal salt and a step of desalting the ?-hydroxy acid metal salt to yield the ?-hydroxy acid.