Abstract: A method for producing an AlN single crystal substrate, the method including: i) preparing a first base substrate consisting of a first AlN single crystal; ii) growing a first AlN single crystal layer over a main face of the first base substrate, to obtain a layered body; iii) cutting the first MN single crystal layer of the layered body, to separate the layered body into a second base substrate and a first part of the first AlN single crystal layer, the second base substrate including the first base substrate and a thin film layered thereon, the thin film being a second part of the first AlN single crystal layer; iv) polishing a surface of the thin film, to obtain a third base substrate consisting of a second AlN single crystal; and v) growing a second AlN single crystal layer over the polished surface of the third base substrate.

Abstract: A membrane-electrode-gasket assembly for alkaline water electrolysis, the assembly including: a separating membrane having first and second membrane faces; a first electrode arranged in contact with the first membrane face; and an insulating gasket holding the membrane and the electrode as one body, the gasket including: first and second faces for contacting with anode- and cathode-side frames respectively; a slit part opening toward an inner side of the gasket and receiving the entire peripheries of the membrane and the electrode; first and second parts facing with each other across the slit part; and a continuous part arranged on an outer periphery side of the slit part, uniting the first and second parts into one body, and sealing an outer periphery end of the slit part, wherein the first and second parts sandwich therebetween to hold the entire peripheries of the membrane and the electrode received in the slit part into one body.

Abstract: To provide (i) a new internal member capable of accelerating reaction between a gas and a solid, (ii) a fluidized-bed reactor in which such an internal member is placed, and (iii) a method for producing trichlorosilane with use of such a fluidized-bed reactor, an internal member in accordance with an embodiment of the present invention is an internal member for use in a fluidized-bed reactor, the internal member including at least one resistive element having an upper surface having a conical or pyramid-shaped portion.

Abstract: A boron structure body includes boron having each concentration of Ti, Al, Fe, Cr, Ni, Co, Cu, W, Ta, Mo and Nb being 0.1 ppmw or less and having a thickness of 0.8 to 5 mm. The boron structure body may have a tubular shape, and when used as a doping agent, a ratio of 11B that is an isotope may be 95 mass % or more. The boron structure body can be easily crushed, and a high-purity boron powder having an average particle diameter of 0.5 to 3 mm and having each metal impurity concentration of 0.3 ppmw or less can be obtained.

Abstract: A method for manufacturing polycrystalline silicon fragments includes producing a polycrystalline silicon rod by the Siemens method; crushing the polycrystalline silicon rod to obtain polycrystalline silicon fragments; and cleaning by etching the polycrystalline silicon fragments in a cleaning tank. In the cleaning, small pieces of the polycrystalline silicon having controlled shapes and sizes are present in the cleaning tank and the weight change of the small pieces of the polycrystalline silicon before and after the etching is measured to thereby manage the cleaning.

Abstract: A group III nitride single crystal substrate including a main surface, the main surface including: a center; a periphery; an outer region whose distance from the center is greater than 30% of a first distance, the first distance being a distance from the center to the periphery; and an inner region whose distance from the center is no more than 30% of the first distance, wherein a ratio (?A??B)/?B is within the range of ±0.1%, wherein ?A is a minimum value of peak wave numbers of micro-Raman spectra in the inner region; and ?B is an average value of peak wave numbers of micro-Raman spectra in the outer region.

Abstract: To provide an adhesive composition capable of firmly bonding polymer sheets together, comprising: (I) 100 parts by mass of an end-unreactive urethane urea resin; and (III) 4.0 to 20 parts by mass of a polyisocyanate compound having at least two isocyanate groups in the molecule, wherein the polyisocyanate compound (III) contains (IIIA) a polyisocyanate compound having an isocyanate group bonded to secondary carbon and (IIIB) a polyisocyanate compound having 4 to 30 carbon atoms in the molecule other than the component (IIIA), and the amount of the component (IIIB) is 10 to 500 parts by mass based on 100 parts by mass of the component (IIIA).

Abstract: A method for effectively removing minute impurities of 1 ?m or less in size that are present on a surface of an aluminum nitride single-crystal substrate without etching the surface includes scrubbing a surface of an aluminum nitride single-crystal substrate using a polymer compound material having lower hardness than an aluminum nitride single crystal, and an alkali aqueous solution having 0.01-1 mass % concentration of potassium hydroxide or sodium hydroxide, the alkali aqueous solution being absorbed in the polymer compound material.

Abstract: A silicon etching solution includes a mixed solution comprising a quaternary alkylammonium hydroxide and water and further comprises a compound represented by the following formula (1): R1O—(CmH2mO)n—R2??(1) wherein R1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R2 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, m is an integer of 2 to 6, and n is 1 or 2.

Abstract: A primer composition for optical articles includes (A) a urethane prepolymer which is a reaction product of an aromatic polyisocyanate compound and a polyol compound, and which has a reactive group at an end, the reactive group being selected from among an isocyanate group and a hydroxyl group, (B) a light absorbing compound which has a maximum absorption wavelength within the range of from 320 nm to 650 nm (inclusive) and (C) an organic solvent which has a solubility parameter of 8 (cal/cm3)1/2 or more, while containing no active hydrogen.

Abstract: This surface-treated sol-gel silica is characterized by containing sol-gel silica having an average particle size of 0.05 ?m or more and 2.0 ?m or less as measured by laser diffraction scattering and a surface treatment agent on the surface of the sol-gel silica. In a dispersion produced by dispersing 5 mass % of the sol-gel silica in ethanol by emitting ultrasonic waves at 40W for 10 minutes, the content of particles with particle sizes of 5 ?m or more is 10 ppm or less in a particle number size distribution obtained by a Coulter counter method.

Abstract: To provide a laminate comprising a pair of polycarbonate optical sheet or film which are laminated together through a polarizing film layer and an adhesive layer of a photochromic composition comprising (I) a polyurethane urea resin and (II) a photochromic compound and having excellent photochromic properties, adhesion, heat resistance, perspiration resistance and excellent adhesion to a lens substrate.

Abstract: In the method, a trione compound represented by the following formula (1) is (i) reduced by NaAlH2(OCH2CH2OCH3)2 and subsequently further reduced by a metal borohydride salt, or (ii) reduced by calcium borohydride, thereby producing an amide alcohol compound represented by the following formula (3) (wherein, R1 and R2 may be the same or different and each represents a hydrogen atom or a protecting group of an ureylene group; R4 represents an alkyl group, an aralkyl group, or an aryl group; and each of R5, R6, and R7 represents a hydrogen atom, an alkyl group, an alkoxy group, or a halogen atom).

Abstract: A chromene compound having at least one indenonaphthopyran moiety which has a group forming a spiro ring together with the 13-position carbon atom and further an oligomer chain group selected from a polyalkylene oxide oligomer chain group having at least three recurring units and a polyester oligomer chain group having at least three recurring units, represented by the following formula and having reduced matrix dependence: wherein R1 and R2 are each a group which may have an oligomer chain group, the ring Z bonded to the 13-position carbon atom of the chromene compound is a Spiro ring group, and R3 and R4 are each an aryl group or heteroaryl group which may have an oligomer chain group. Preferably, the chromene compound has at least one oligomer chain group in the molecule.

Abstract: A photochromic polyrotaxane compound which comprises an axial molecule and a plurality of cyclic molecules clathrating the axial molecule, wherein at least one side chain containing a photochromic moiety is bonded to at least one of the cyclic molecules, and a curable composition comprising the photochromic polyrotaxane compound and a polymerizable compound.

Abstract: A core wire holder 3 attached on an electrode 2 placed on a bottom panel of a device 20 for producing silicon by Siemens process includes a silicon core wire holding portion 9 being generally circular truncated cone-shaped, and holding and energizing a silicon core wire 4. The silicon core wire holding portion 9 includes a generally circular truncated cone having an upper surface formed with a silicon core wire insertion hole 7 for holding the silicon core wire 4, and the silicon core wire holding portion 9 includes an upper surface and a side surface, which form a ridge having a curved surface and serving as a chamfered portion 8.

Abstract: A teat opening protection Patch is stuck to portions inclusive of the teat openings of livestock, and includes a laminate 1 of an elastic sheet 2 and an adhesive layer 3 laminated on one surface of the elastic sheet 2, the laminate 1 having a double-stretched tensile stress in a range of 0.1 to 5 N.

Abstract: A teat opening protection patch is stuck to portions inclusive of the teat openings of livestock, and includes a laminate 1 of an elastic sheet 2 and an adhesive layer 3 laminated on one surface of the elastic sheet 2, the laminate 1 having a double-stretched tensile stress in a range of 0.1 to 5 N.

Abstract: A teat opening protection patch is stuck to portions inclusive of the teat openings of livestock, and includes a laminate 1 of an elastic sheet 2 and an adhesive layer 3 laminated on one surface of the elastic sheet 2, the laminate 1 having a double-stretched tensile stress in a range of 0.1 to 5 N.

Abstract: A process for producing a modified fly ash comprising the steps of providing, as a raw material, the raw fly ash discharged from a pulverized coal combustion boiler; classifying the raw fly ash into a crude powder and a fine powder; removing the unburned carbon contained in the crude powder by heating the crude powder at a temperature in a range of 500 to 1000° C.; and mixing together the crude powder from which the unburned carbon has been removed and the fine powder to obtain a modified fly ash.