Abstract: A group-III nitride substrate includes: a first region having a first impurity concentration in a polished surface; and a second region having a second impurity concentration lower than the first impurity concentration in the polished surface, wherein a first dislocation density of the first region is lower than a second dislocation density of the second region.

Abstract: A group-III nitride substrate includes: a first region having a first impurity concentration in a polished surface; and a second region having a second impurity concentration lower than the first impurity concentration in the polished surface, wherein a first dislocation density of the first region is lower than a second dislocation density of the second region.

Abstract: A Ni-based alloy hardened with the ? phase, which is able to exhibit not only superior strength at high temperatures, but also excellent hot corrosion resistance and oxidation resistance at high temperatures in spite of containing no Re or reducing the amount of Re. The Ni-based superalloy contains, by weight, C: 0.01 to 0.5%, B: 0.01 to 0.04%, Hf: 0.1 to 2.5%, Co: 0.8 to 15%, Ta: more than 0% but less than 8.5%, Cr: 1.5 to 16%, Mo: more than 0% but less than 1.0%, W: 5 to 14%, Ti: 0.1 to 4.75%, Al: 2.5 to 7%, Nb: more than 0 % but less than 4%, V: 0 to less than 1.0%, Zr: 0 to less than 0.1%, Re: 0 to less than 9%, at least one of platinum group elements: 0 to less than 0.5% in total, at least one of rare earth elements: 0 to less than 0.1% in total, and the rest being Ni except for unavoidable impurities.

Abstract: A Ni-based alloy hardened with the ?? phase, which is able to exhibit not only superior strength at high temperatures, but also excellent hot corrosion resistance and oxidation resistance at high temperatures in spite of containing no Re or reducing the amount of Re. The Ni-based superalloy contains, by weight, C: 0.01 to 0.5%, B: 0.01 to 0.04%, Hf: 0.1 to 2.5%, Co: 0.8 to 15%, Ta: more than 0% but less than 8.5%, Cr: 1.5 to 16%, Mo: more than 0% but less than 1.0%, W: 5 to 14%, Ti: 0.1 to 4.75%, Al: 2.5 to 7%, Nb: more than 0% but less than 4%, V: 0 to less than 1.0%, Zr: 0 to less than 0.1%, Re: 0 to less than 9%, at least one of platinum group elements: 0 to less than 0.5% in total, at least one of rare earth elements: 0 to less than 0.1% in total, and the rest being Ni except for unavoidable impurities.

Abstract: A Ni-based alloy hardened with the &ggr;′ phase, which is able to exhibit not only superior strength at high temperatures, but also excellent hot corrosion resistance and oxidation resistance at high temperatures in spite of containing no Re or reducing the amount of Re. The Ni-based superalloy contains, by weight, C:0.01 to 0.5%, B:0.01 to 0.04%, Hf:0.1 to 2.5%, Co:0.8 to 15%, Ta:more than 0% but less than 8.5%, Cr:1.5 to 16%, Mo:more than 0% but less than 1.0%, W:5 to 14%, Ti:0.1 to 4.75%, Al:2.5 to 7%, Nb:more than 0% but less than 4%, V:0 to less than 1.0%, Zr:0 to less than 0.1%, Re:0 to less than 9%, at least one of platinum group elements: 0 to less than 0.5% in total, at least one of rare earth elements: 0 to less than 0.1% in total, and the rest being Ni except for unavoidable impurities.

Abstract: This invention provides an oxide-type superconducting flat wire having a critical current density of at least 1,000 A/cm.sup.2, which comprises a Y--Ba--Cu oxide layer having a superconducting property and a silver layer surrounding the oxide layer and has so flat a cross section vertical to the longitudinal direction of the wire that the upper and lower lines between the oxide layer and the silver layers appearing on the cross section having a zone over they are parallel to each other, the thickness of the oxide layer being cold rolled in the range of 0.35 to 0.75 based on the whole thickness of the wire, the whole thickness being 0.2 mm or less, and the metal layer being deformable to follow the shrink deformation of the oxide layer when heat treated to be sintered, but rigid when used.

Abstract: A diagnostic patch comprising at least an adsorption carrier adsorbing a substance secreted from a living body, which is useful particularly for the diagnosis of mammary cancer or atopic dermatitis, and a method for the diagnosis of mammary cancer or atopic dermatitis with said preparation.

Abstract: In order to provide a high strength Ni-base superalloy for directionally solidified castings, which is prevented from solidification cracking at the casting, having a sufficient grain boundary strength for ensuring reliability during its operation and a superior high temperature concurrently, a high strength Ni-base superalloy for directionally solidified castings having a superior grain boundary strength, which contains C: 0.05% to less than 0.1%, B: 0.015% to 0.04%, Hf: 0.01.about.less than 0.5%, Zr: less than 0.01%, Cr: 1.5%.about.16%, Mo: utmost 6%, W: 2.about.12%, Re: 0.1.about.9%, Ta: 2.about.12%, Nb: utmost 4%, Al: 4.5.about.6.5%, Ti: less than 0.5%, Co: less than 9%, and Ni: at least 60% in weight, is disclosed.

Abstract: Piperidine derivatives represented by general formula (I) ##STR1## or pharmaceutically acceptable acid addition salts thereof: wherein n represents an integer of 0 or 1; X represents CH.sub.2, O or CH--CH.sub.3 ; R represents hydrogen, halogen, lower alkyl, hydroxy, lower alkoxy, lower alkylthio, lower alkylsulfinyl, lower alkylsulfonyl, substituted aminosulfonyl or nitro; R.sub.1 and R.sub.2 may be the same or different and each represents hydrogen or lower alkyl, are disclosed. The piperidine derivatives have an antagonism on Substance P and is useful as a preventive or remedy for asthma, vomiting, etc.

Abstract: A method of producing a high-temperature oxide superconducting material, which comprises the steps of (a) preparing a material corresponding to an oxide superconductor of the perovskite type structure consisting essentially of a first member selected from the group consisting yttrium, lanthanoids, thallium and bismuth; at least one alkaline earth metal; copper; and oxygen and (b) heating the material in the presence of an alkali metal selected from the group consisting of potassium, sodium, rubidium and cesium to a temperature around the melting point of the alkali metal or to a higher temperature for a time sufficient to effect grain growth in the superconductor material, thereby to produce the superconductor containing the alkali metal in an amount not larger than 4 mole % based on the first member.

Abstract: The present invention provides a shaped superconductor article such as wire, tape or disk, comprising an oxide superconductor phase and a metal phase in a monolayered or multilayered form, the metal phase comprising a copper, iron, nickel or titanium base alloy containing 1 to 10% by weight of aluminum and having an oxygen-impermeable oxide film formed thereon, preventing the diffusion of oxygen from the oxide superconductor phase to the metal phase.

Abstract: In solid phase diffusion welding of a nickel base superalloy having nickel as a main component, an insert material for solid phase diffusion welding and method thereof are disclosed which can improve the welding strength, the insert material consists of an alloy containing 5-25% by atomic % of total atomic amount of at least one selected from aluminum, titanium, tantalum and niobium, [100-(total atomic % of aluminum, titanium, tantalum and niobium).times.4] % or less by atomic % of total atomic amount of at least one selected from chromium, cobalt, tungsten, molybdenum and zirconium and the balance being substantially nickel.After this insert material is previously subjected to heat treatment at between 700.degree. C. and melting point or plastic working, it is interposed between the welded surfaces and heated up to a temperature of the melting point or less of base metal in vacuum or inactive gas solid phase diffusion welding.

Abstract: A structure comprising a main body formed of a nickel base alloy, and a NiAl coating applied to the main body, wherein the NiAl coating includes a nickel rich NiAl layer and an aluminum rich NiAl layer and the thickness ratio of the nickel rich NiAl layer to the whole NiAl coating is in a range between 20 and 40%. A method of applying an aluminum coating to a nickel base alloy comprising the steps of forming an aluminide layer of Ni.sub.2 Al.sub.3 on the surface portion of the nickel base alloy by the diffusion and penetration of aluminum, and subjecting the alumide layer to heat treatment to change the aluminide layer to a monoaluminide layer and making the thickness ratio of a nickel rich NiAl layer to the whole monoaluminide layer be in the range between 20 and 40%.

Abstract: This invention relates to an apparatus for production of metal powders of a low oxygen content, which are preferred as raw material powders for sintered bodies of a high toughness, according to the water atomizing method. More specifically, when a molten metal is sprayed in a limited space with use of a liquid crystal medium and cooled promptly, a metal powder results of a good moldability which has an oxygen content corresponding to 1/2 or less of the oxygen contents of metal powders prepared by conventional apparatuses and which is excellent in the size uniformity.