Abstract: A high temperature oxide superconducting wire is provided which is capable of preventing metal located on the outer periphery of the superconducting wire from diffusing into a superconductor to achieve restriction of reduction in the critical current density. The high temperature oxide superconducting wire includes a high temperature oxide superconductor 1, a sheathing body 2 formed of material containing silver for coating the high temperature oxide superconductor 1, a heat-resistant oxide ceramic material 3 for coating the sheathing body 2, and a coating body 4 mwhich is inactive relative to the heat-resistant oxide ceramic material 3 in a high temperature oxidative atmosphere.

Abstract: Provided are an oxide superconducting wire which maintains a high critical current density and has a small current drift with small ac loss when the same carries an alternating current and a method of preparing the same, and a cable conductor which is formed by assembling such oxide superconducting wires. The oxide superconducting wire is a flat-molded stranded wire which is formed by twisting a plurality of metal-coated strands consisting of an oxide superconductor, and is characterized in that the flat-molded stranded wire has a rectangular sectional shape, and a section of each strand forming the flat-molded stranded wire has an aspect ratio (W1/T1) of at least 2. The method of preparing this oxide superconducting wire comprises the steps of preparing a stranded wire by twisting a plurality of strands, each of which is formed by metal-coating an oxide superconductor or raw material powder therefor, flat-molding the prepared stranded wire, and repeating rolling and a heat treatment of at least 800° C.

Abstract: A SQUID made of an oxide superconducting thin film is formed on a sapphire substrate. CeO2 film, RBa2Cu3O7−x film (“R” indicates a rare earth element chosen among a group formed of Yb, Er, Ho, Y, Dy, Gd, Eu, Sm and Nd) and SrTiO3 film are deposited on the substrate top of the sapphire substrate successively. Furthermore, an oxide superconducting thin film to form a SQUID is deposited on the SrTiO3 film.

Abstract: A proportional pressure control valve of the type in which a spool is driven by an electromagnet to control the load pressure to a value corresponding to the electromagnet energizing current is provided to simplify and reduce the cost of such valve. The number of springs has been reduced to one by biasing the spool with a spring through an actuating element of the electromagnet. Also, by providing a reaction force piston near a low-pressure pressure chamber, the need to form a hole in the actuator at a functionally important portion has been eliminated. Furthermore, arrangement is such that the load pressure acts on the spool in the same direction with the force of the electromagnet to supplement it. Further, the actuating element is formed integrally with the spool to eliminate any sliding portions from the actuating element, and a gap is formed between the actuation element and the member surrounding the actuating element to reduce the sliding resistance thereof.

Abstract: A long oxide superconducting wire for a coil or a cable, manufacturing method thereof, an oxide superconducting coil and a cable conductor which have high operational frequency are provided. The wire is a tape-like oxide superconducting wire including a plurality of filaments of oxide superconductor embedded in a matrix, and each filament is twisted spirally along the longitudinal direction of the tape wire. By winding the wire in a coil, an oxide superconducting coil is obtained. When a plurality of such wires are collected, an oxide superconducting cable conductor can be obtained.

Abstract: In a heating furnace which holds at least one end of a glass rod with a holding portion and elongates the glass rod by softening the glass rod successively from the other end portion thereof with heating while applying a tensile force thereto, the heating furnace comprises a tubular portion through which the glass rod to be elongated is inserted such as to be longitudinally movable; heater, positioned within the tubular portion such as to circumferentially surround the glass rod, for heating the glass rod; a moving portion through which one end of the glass rod is inserted; bellows the ends of which are respectively secured to the moving portion and the tubular portion and which is longitudinally expandable and contractible and composed of at least a double cylinder surrounding the part of the glass rod such as to block an outside air from flowing into the heating furnace; and gas supply line for supplying, for purging, an inert gas into a space within the tubular portion and the inner bellows as well as the

Abstract: The present invention relates to a single-mode optical fiber having a configuration which enables lowering of dispersion slope while securing a sufficient MFD. This single-mode optical fiber has a refractive index profile in which an indent with a sufficient width is provided at the center of its core region. In particular, this indent satisfies the following relationship:a.multidot.(.DELTA.n.sub.2 -.DELTA.n.sub.1)/(b.multidot..DELTA.n.sub.2).gtoreq.0.04when the first core portion in the single-mode optical fiber has a mean relative refractive index difference of .DELTA.n.sub.1 with respect to the cladding portion and an outer diameter of a while the second core portion has a mean relative refractive index difference of .DELTA.n.sub.2 with respect to the cladding portion and an outer diameter of b.

Abstract: A highly reliable connecting lead for devices that mount semiconductors. The lead is made of copper or copper alloy. The thickness of the oxide film at the interface between the copper or copper alloy lead and an aluminum bump electrode is 10 nm or less. The contents of oxygen and carbon in the aluminum bump electrode are 1 atm % or less each.

Abstract: In a method of manufacturing a self-support optical cable, a support wire and an optical cable body arranged in parallel are fed with each other; a sheath into an eight figure shape is extruded by an extruder to collectively coat the outer circumferences of the support wire and the optical cable body with the sheath, and thereafter, the self-support optical cable is cooled before hardening while the cable passes through a plurality of guide wheels so that an excess length is given to the optical cable body.

Abstract: The present invention provides a thermocompression tool, i.e. high strength bonding tool used for mounting a semiconductor device or element such as IC, LSI, etc. on a substrate, for example, a tool of pulse heating type used for soldering, and a mounting tool (bonding tool) used for heating, melting and bonding or thermocompression bonding in a lump a number of workpieces to be bonded, making up a part of electronic parts, in particular, a high precision tool called outer lead bonding tool. The high strength bonding tool comprises a substrate consisting of a cemented carbide having microscopic protrusions of hard carbides and/or hard carbonitrides on at least one surface and a coefficient of linear expansion of 4.0.times.10.sup.-6 to 5.5.times.10.sup.-6 /.degree. C. at room temperature to 400.degree. C.

Abstract: The present invention relates to a single-mode optical fiber having a configuration which enables lowering of dispersion slope while securing a sufficient MFD. This single-mode optical fiber has a refractive index profile in which an indent with a sufficient width is provided at the center of its core region. In particular, this indent satisfies the following relationship:a.multidot.(.DELTA.n.sub.2 -.DELTA.n.sub.1)/(b.multidot..DELTA.n.sub.2).gtoreq.0.04when the first core portion in the single-mode optical fiber has a mean relative refractive index difference of .DELTA.n.sub.1 with respect to the cladding portion and an outer diameter of a while the second core portion has a mean relative refractive index difference of .DELTA.n.sub.2 with respect to the cladding portion and an outer diameter of b.

Abstract: A metal electrode disposed on a surface of an oxide superconductor and forming electric contact with the oxide superconductor wherein at least a portion of the metal electrode is in contact with a side surface of the oxide superconductor which is perpendicular to the surface on which the metal electrode is disposed.

Abstract: The present invention provides a thermocompression tool, i.e. high strength bonding tool used for mounting a semiconductor device or element such as IC, LSI, etc. on a substrate, for example, a tool of pulse heating type used for soldering, and a mounting tool (bonding tool). The tool is used for heating, melting and bonding or thermocompression bonding in a lump a number of workpieces to be bonded, making up a part of electronic parts, in particular, a high precision tool called outer lead bonding tool. The high strength bonding tool has a substrate that is composed of a cemented carbide having microscopic protrusions of hard carbides and/or hard carbonitrides on at least one surface and having a coefficient of linear expansion of 4.0.times.10.sup.-6 to 5.5.times.10.sup.-6 /.degree.C. at room temperature to 400.degree. C.

Abstract: An optical fiber amplifier comprises a composite optical fiber for receiving signal light and excitation light, amplifying the signal light and emitting the amplified signal light, comprising at least two kinds of optical fibers serially coupled each having a glass composition selected from at least two kinds of rare-earth-doped glass compositions, and excitation means for generating excitation light and supplying it to the composite optical fiber. Then, an optical fiber amplifier which reduces the wavelength dependency of gain in various wavelength ranges in wavelength division multiplexing transmission or in optical analog transmission, and which maintains an energy efficiency for amplification, an optical fiber amplifier which makes a wavelength at a gain peak to a predetermined one in accordance with intensities of various input lights, and an optical amplifier repeater comprising this optical fiber amplifier are provided.

Abstract: A process for the production of a sintered composite boron carbide body, the process comprising:(a) mixing 40.0 to 99.5 volume % of B.sub.4 C with 0.5 to 60.0 volume % of fine grain powdered SiC, TiC, or both in an organic solvent;(b) drying to form a powder mix; and(c) hot pressing the mix at 1,800.degree. to 2,300.degree. C. for 5 to 600 minutes,whereby the body comprises SiC, TiB.sub.2 or both dispersed in the B.sub.4 C and whereby the body further comprises(i) B.sub.4 C matrix crystal grains having an average grain size of not more than 3.0 .mu.m and(ii) dispersed uniform fine grains of SiC, TiB.sub.2, or both having an average grain size of 1 to 500 nm free of coarse grains and whiskers, the dispersed fine grains being distributed within the matrix crystal grains.

Abstract: A furnace and method for drawing an optical fiber is provided. The furnace included a furnace core chamber in which a preform is inserted into the chamber through the upper end thereof and a drawn optical fiber is pulled out of the chamber through an opening positioned at the lower end thereof. The furnace also includes a gas-supply means for introducing an inert gas into the furnace core chamber to thus establish an inert gas atmosphere within the chamber, and a heater for heating the preform so that the lower part of the preform is molten and drawn into the optical fiber, which is positioned around the outer periphery of the furnace core chamber. The furnace further includes an inner furnace core tube, which is positioned within the furnace core chamber and which has a cylindrical part whose lower part is communicated to the opening of the furnace core chamber and a funnel-like part which is positioned on the upper end of the cylindrical part.

Abstract: An apparatus for connecting metal tubes covering optical fiber cables includes at least two clamp units 10, 10' for holding a metal sleeve (C5) and two metal tubes (C2, C2') covering two optical fiber cables (C, C') in close position. A laser welding head is placed between two adjacent clamp units. Each clamp unit has a gear (22) as a rotation body to be driven by a drive gear, a clamp device (28, 33, 34) for clamping the metal tube covered optical fiber cables which are introduced in inserting holes (31) where the metal tube covered optical fiber cables are inserted. The clamp device is supported by the rotation body (22) so as to be movable together with the rotation body. The rotation body and the clamp device each are provided with a radially extending selectively open or blocked extraction path (36, 22') to remove, in a radial direction, the metal tube optical fiber cable which has been connected by the apparatus.

Abstract: An LPC analysis of a voice waveform is performed by an LPC analyzing circuit before analyzing vocal tract parameters by a vocal tract parameter analyzing circuit. The result of the analysis is converted into the components of source parameters by converting circuits and to eliminate the component of the source parameters from the voice waveform by an inverse filter. The components of the vocal tract parameters obtained by the analysis in the vocal tract parameter analyzing circuit is eliminated from the voice waveform through an inverse filter.

Abstract: An apparatus for vitrifying a soot preform from which an optical fiber is produced by drawing, is composed of a main vacuum chamber 20 in which a muffle tube 70 for vitrifying the soot preform PF is located, and an auxiliary vacuum chamber 30 mounted on the main vacuum chamber 20 and communicated therewith through a passage, and a gate valve 60 for opening and closing the passage. The muffle tube 70 has a inner surface covered with silicon carbide layer 70a.

Abstract: A long-life, inexpensive rotary anode for use in an X-ray tube having an X-ray generating layer formed by CVD on a graphite substrate and capable of producing high-power X-rays without the possibility of thermal cracks or delamination. When forming the X-ray generating layer of a tungsten-rhenium alloy on the graphite substrate through a rhenium intermediate layer by CVD, material gases are supplied intermittently so that the entire part or only the surface area of the X-ray generating layer will be formed of laminated structure of ultra-thin films each 0.1-5.0 microns thick. The content of rhenium in the tungsten-rhenium alloy forming the X-ray generating layer has a gradient form, i.e. increases from the interface with the rhenium intermediate layer toward the surface, so that the total amount of rhenium added can be reduced.