Abstract: A process for producing an ultrafine multifilamentary superconducting Nb3(Al,Ge) wire capable of generating a high critical current density comprising: preparing a composite core material comprising an A1—(2-30)at. % Ge alloy (where at. % represents % by atomic) 1 &mgr;m or less in thickness uniformly incorporated into a Nb matrix at a volume ratio in a range of 1:2.5 to 1:3.5 and forming a composite therewith; fabricating a composite wire having an ultrafine multifilamentary structure by embedding several tens to several millions of the resulting composite core materials in a cylindrical matrix material containing Nb; forming a A15-phase filament having a lower order in crystallinity inside the composite wire by a rapid heating and quenching treatment comprising rapidly heating to a temperature of 1,700° C.

Abstract: Ups and downs having a cycle of not more than 5 &mgr;m and an amplitude of not less than 200 nm are formed in a part of not less than 70% per unit length of a prior-austenite grain boundary which is observed in a linear form when seen from a vertical plane by a series of steps of subjecting a steel in a state of austenite to a deformation in not less than 30% of a total area reduction rate at a temperature region which is lower than recrystallization temperature of austenite, and subsequently cooling a deformed steel without causing neither recrystallization nor phase transformation of a diffusion type.

Abstract: Si nanocrystals are formed by irradiating SiO2 substrates with electron beams at a temperature of 400° C. or higher, thereby causing electron-stimulated decomposition reaction. As a result of the said reaction, single crystalline Si nanostructures are fabricated on the SiO2 substrate with good size and positional controllability.

Abstract: A simple and low-cost method for producing a thin film of ribbon-like oxide high-temperature (high-Tc) superconductor, which comprises placing a solid starting material for the oxide high-temperature superconductor on a substrate and heating it at a temperature in the vicinity of the melting point of the solid starting material under ambient pressure in an oxygen atmosphere.

Abstract: The invention according to the present application provides a high strength solidification body by solidifying a starting metallic powder of iron and the like by means of plastic working using hydrostatic pressing, which is, for instance, a high strength high toughness steel material and the like having a superfine texture comprising a crystalline texture consisting of grains 5 &mgr;m or less in average diameter, or preferably, 3 &mgr;m or less in average diameter. Furthermore, the present invention provides a steel material included in the high strength solidification body, which contains oxide grain 0.2 &mgr;m or less in diameter at a volume ratio of from 0.5 to 60%.

Abstract: Heat resisting steel containing a ferrite or tempered martensite structure, in which intermetallic compound phases having a L10 or L12 ordered structure are uniformly precipitated in ferrite or tempered martensite grains.

Abstract: In order to provide a welding system capable of freely controlling dispersion and concentration of arc heat input at a groove face of base material, and ensure melting of the base material while restraining excessive weld heat input, in arc welding using a wire consumable electrode system, at a groove between members to be welded a position of a weld torch or feed speed of a wire is periodically varied, and welding is carried out by controlling a difference between the phase of the variation and a phase of an arc current waveform in accordance with a change in the arc current waveform.

Abstract: A high strength phosphorus-containing steel having fine texture free from the problem of embrittlement by positively using the presence of P, which is a carbon steel having an average ferritic grain diameter of 3 &mgr;m or less and containing from 0.04 to 0.1% by mass of P, wherein the volume fraction of P segregated in the grain boundary accounts for 0.3 or less in case the grain boundary is covered by a P layer 1 nm in thickness.

Abstract: A clad superconductive wire or tape of an oxide superconductive material and a silver-copper alloy base containing 0.05-90 atomic % a copper or a silver alloy. The silver-copper alloy base contains one or more elements selected from the group of Zr, Hf, Al, V, Nb and Ta in amounts of from 0.01-3 atomic %, or contains Au in amount of 0.01-10 atomic %. The silver alloy contains one or more elements selected from the group of Ti, Zr, Hf, V, Nb, Ta, Mg, Ca, Sr and Ba in amounts of from 0.01 to 3 atomic %, or one or more elements selected from the group of Au, Al, Ga, In and Sn in amounts of 0.05 to atomic %. The base material is filled with a Bi-containing oxide of Bi1PbuSrxCayCuzOw wherein u=0-0.3, X=0.8-1.2, y=0.2-1.2, and z=0.8-2.0, and processed to obtain a superconductive wire or tape having enhanced mechanical strength, superconductivity and plastic workability.

Abstract: A clad superconductive wire or tape of an oxide superconductive material and a silver-copper alloy base containing 0.05-90 atomic % copper or a silver alloy. The silver-copper alloy base contains one or more elements selected from the group of Zr, Hf, Al, V, Nb and Ta in amounts of from 0.01-3 atomic %, or contains Au in amount of 0.01-10 atomic %. The silver alloy contains one or more elements selected from the group of Ti, Zr, Hf, V, Nb, Ta, Mg, Ca, Sr and Ba in amounts of from 0.01 to 3 atomic %, or one or more elements selected from the group of Au, Al, Ga, In and Sn in amounts of 0.05 to atomic %. The base material is filled with a Bi-containing oxide of Bi1PbuSrxCayCuzOw wherein u=0-0.3, X=0.8-1.2, y=0.2-1.2, and z=0.8-2.0, and processed to obtain a superconductive wire or tape having enhanced mechanical strength, superconductivity and plastic workability.

Abstract: In a process in which a composite consisting of a metallic base and a superconductor mainly containing a Bi2Sr2CaCu2Ox superconducting phase is formed into a composite wire or wire, the composite is subjected to calcination and cold working before heat treatment for crystallization from a partial molten state.

Abstract: A Ni-base directionally solidified alloy casting is produced by casting a Ni-base directionally solidified alloy having a composition of 10 to 14 wt. % Co, 2 to 3 wt. % Cr, 1.5 to 2.5 wt. % Mo, 5 to 6.5 wt. % W, 5.7 to 6.5 wt. % Al, 5.5 to 6.5 wt. % Ta, 4.5 to 5.0 wt. % Rd, 0.01 to 1.5 wt. % Hf, 0.01 to 0.30 wt. % C, 0.01 to 0.03 wt. % B, and the balance of Ni and inevitable impurities. The Ni-base directionally solidified alloy casting is subjected to a solid solution treatment process at a temperature in the range of 1250 to 1300° C. Then the Ni-base directionally solidified alloy casting is subjected to a two-stage aging process for aging the Ni-base directionally solidified alloy casting at a temperature in the range of 750 to 1200° C.

Abstract: The invention provides an ultra-fine grain steel comprising fine ferrite grains as oriented at random and surrounded by large angle grain boundaries. The steel comprises fine ferrite grains having a mean grain size of not larger and 3.0 &mgr;m and surrounded by large angle grain boundaries having an misorientation not smaller than 15°.

Abstract: A pulse discharge is caused between an electrode in an insulating nozzle 2 jetting a gas in vacuum and a skimmer 8. An apparatus for performing the method includes an insulating nozzle 2 perforated with a gas jet hole 2a at a front end thereof and having a needle-like electrode 5 at an inside thereof, and includes a skimmer 8 formed in a funnel-like shape and having an opening portion 8a at a front end thereof. The opening 8a is arranged at a position remote from the gas jet hole 2a of the insulating nozzle 2 by a predetermined distance. The method and apparatus can be used in the field of measurement, material synthesis and the like with an object of surface science, and can form simultaneously and with high intensity both pulsed metastable atom beam and pulsed ultraviolet radiation which can be preferably used as a probe for investigating the electronic state at a surface of a substance and several layers on the inner side of the surface.

Abstract: The invention relates to a nickel-base single-crystal superalloy applied to parts for industrial gas turbine or the like such as turbine rotor blade and stator blade which are used at high temperatures, a method for manufacturing the same, and gas turbine parts prepared from such nickel-base single-crystal superalloys, and more particularly the invention provides a nickel-base single-crystal superalloy consisting essentially of, in percentages by weight, 5% to 10% cobalt, 4.7% to 6% chromium, more than 2.0% to less than 3.5% molybdenum, 7.5% to 10% tungsten, 5% to 6% aluminum, 0.1% to 2% titanium, 4% to 5.5% tantalum, 1% to 4% rhenium, 0.01% to 0.2% hafnium, the balance being nickel and incidental impurities, which is excellent in high-temperature strength and high-temperature corrosion resistance, and further excellent in structural stability even in a long time use.

Abstract: To provide an antimonic acid film having an excellent conductivity and a high response to humidity, and useful as a high-performance humidity sensor, a hydrogen gas sensor or a hydrogen fuel cell, the present invention provides an antimonic acid film comprising single crystals of cubic antimonic acid dispersed in amorphous antimonic acid by causing metallic antimony or an oxygen-containing compound thereof to react with hydrogen peroxide using the resultant reaction solution as the raw material, and forming a film on an insulated substrate.

Abstract: An oxide single crystal having a nominal composition expressed BaM.sub.2 O.sub.4 (M is at least an element selected from the group consisting of Al and Ga), M of which is partially substituted with B, is provided. The BaM.sub.2 O.sub.4 oxide single crystal has an asymmetric central portion formed around B and thereby exhibits a non-linear optical property.

Abstract: An amorphous substance has a nominal composition expressed by a general formula of Ba(B.sub.1-x M.sub.x).sub.2 O.sub.4 (where M is at least one element selected from the group consisting of Al and Ga, and 0.05<x<0.20).

Abstract: A phthalocyanine radical anion stable in ambient atmosphere, which is formed by subjecting a salt containing dihalogeno(phthalocyaninato)antimony (V) cation to a one-electron reduction. According to the present invention, a phthalocyaninc radical stable in ambient atmosphere, which is expected to be developed as an n-type organic semiconductor, is provided.

Abstract: In carbon steel, oxides with grain diameter of 1 .mu.m or less and with grain spacing of 6 .mu.m or less are dispersed to suppress growth of .gamma. grains by heating at .gamma. region temperature.