Abstract:
The invention provides a conductor comprising a reaction-sintered body of a conductive nitride produced from a powder of at least one metal selected from Ti, Zr, V, Nb, Ta, Cr, Ce, Co, Mn, Hf, W, Mo, Fe, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Yb, Lu, Th and Ni, and a process for producing such conductor by heating a molding containing a metal powder in a nitriding gaseous atmosphere containing no CO gas.
Abstract:
A method of treating a metal alkoxide solution to form metal oxide prepolymer molecules therein is characterized by irradiating the solution with light energy having a wavelength selected to break the metal-alkoxy group bond in said metal alkoxide, thereby to form the metal oxide prepolymer molecules in the solution. The prepolymer is converted into polymeric metal oxide gel. The stoichiometry of the oxide is high. A gel of carbon content below 4 atomic % can be achieved by the step of decarbonizing the gel, preferably using light to produce ozone.
Abstract:
A structure of a nuclear fusion reactor having a vacuum vessel in which hydrogen isotope plasma is enclosed and a confining magnetic field generating coil for confining said plasma at a predetermined position in said vacuum vessel. It comprises a low tritium-permeable layer having lower tritium-permeability than that of a cooling metal base for forming a refrigerant passage for cooling the vacuum vessel on at least the surface adjacent to said plasma enclosed and a heat resistant and insulating fire member of the level higher than that of said cooling metal base for thermally shielding said low tritium-permeable layer from said plasma or corpuscular rays is formed on the low tritium-permeable layer. The similar processings are applied to the cooling metal base for forming the refrigerant passage for cooling a divertor disposed in the vacuum vessel and for neutralizing ionized corpuscles so as to exhaust them.
Abstract:
A superconducting oxide wire and a method of manufacturing the same are disclosed. The wire comprises a pipe made of a metal and a superconducting oxide material filling the interior of the pipe and comprising superconducting oxide grains which are bonded to each other and which have a perovskite crystal structure having a C face and a C axis. The superconducting oxide grains contain more than 50 vol % of plate-shaped grains of which the length in the direction of the C face is greater than the length in the direction of the C axis. The C faces of most the plate-shaped grains are arranged to be directed toward longitudinal axis of the pipe.
Abstract:
There is obtained, by mixing oxide raw material powders, compacting the mixture and sintering the compact, a silicon nitride sintered body mainly composed of silicon nitride and having a grain boundary phase wherein crystals represented by Yb.sub.2 Si.sub.2 O.sub.7 and a Zr.sub.3 Yb.sub.4 O.sub.12 are present in the grain boundary phase and molar ratio ZrO.sub.2 /Yb.sub.2 O.sub.3 in terms of ZrO.sub.2 and Yb.sub.2 O.sub.3 is 2/98 to 75/25 and the total amount of ZrO.sub.2 and Yb.sub.2 O.sub.3 is 1-40% by weight of the sintered body.
Abstract translation:通过混合氧化物原料粉末,将混合物压实并烧结成型体,主要由氮化硅组成并具有晶界相的氮化硅烧结体,其中由Yb2Si2O7和Zr3Yb4O12表示的晶体存在于晶界相 ZrO 2和Yb 2 O 3的摩尔比ZrO2 / Yb2O3为2/98〜75/25,ZrO2和Yb2O3的总量为烧结体的1-40重量%。
Abstract:
A photo-coupler semiconductor device includes a semiconductor light emitter and a semiconductor light detector coupled optically with each other through an optical guide. A portion of the optical guide close to the semiconductor light detector is made of glass. The glass portion of the optical guide is brought into intimate contact with a glass layer which is formed on a light sensitive region of the semiconductor light detector. The intimate contact is made by melting the glass portion on the glass layer.
Abstract:
The present invention provides fiber-reinforced ceramics containing at least one member of fibers and whiskers as distributed in a sintering ceramic matrix, which comprises the ceramic matrix being composed mainly of SiC, Si.sub.3 N.sub.4 and Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z, where 0
Abstract:
Oxygen sensor ceramic of solid electrolyte of zirconia-yttria system comprises aggregates of cubic zirconia grains having an average grain size of 2-10 .mu.m and monoclinic zirconia grains having an average grain size of 0.2-1 .mu.m, the appregates of the cubic zirconia grains being in contact with one another, and the monoclinic zirconia grains being distributed as aggregates in clearances among the aggregates of the cubic zirconia grains, and has a high thermal shock resistance, a high mechanical strength and a resistivity equal to that of the ceramic consisting only of cubic zirconia grains. The oxygen sensor ceramic is prepared by mixing zirconia powder having a grain size of 0.1-0.5 .mu.m with 4-8% by mole of yttria powder having an average grain size of 0.5-5 .mu.m, on the basis of total mixture, and molding and firing the mixture at 1,400.degree.-1,550.degree. C.
Abstract:
There are provided a sodium-sulfur battery system suitable for shifting the peak of an electric power line, and a method of operating the sodium-sulfur battery system and an electric power line system using the sodium-sulfur battery system. In a sodium-sulfur battery system comprising a battery module having a sodium-sulfur battery contained in a thermal insulation container, an amount of peak-shift of an electric power line, which can be performed by the battery module, is calculated using a daily load characteristic of the electric power line and a discharge characteristic of the battery module, and an allowable amount of heat generation in battery and an allowable amount of discharge, and discharge of the battery module is controlled using the calculated result. The peak-shift of an electric power line can be effectively performed without deteriorating the reliability of the sodium-sulfur battery, and the efficiencies of the sodium-sulfur battery system and an electric power line system using the sodium-sulfur battery system can be kept high.
Abstract:
A superconducting oxide wire and a method of manufacturing the same are disclosed. The wire comprises a pipe made of a metal and a superconducting oxide material filling the interior of the pipe and comprising superconducting oxide grains which are bonded to each other and which have a perovskite crystal structure having a C face and a C axis. The superconducting oxide grains contain more than 50 vol % of plate-shaped grains of which the length in the direction of the C face is greater than the length in the direction of the C axis. The C faces of most the plate-shaped grains are arranged to be directed toward longitudinal axis of the pipe.