Abstract: A changeover valve has a valve body formed on a valve rod in such a manner as to be detached from forming molds and easily and securely mounted on a projection formed on the valve rod. The valve body is bisected at the center of the projection on the valve rod and has a mechanism for effectively preventing the downward penetration of compressed air from the edge of the bisected segment. The changeover valve has a valve rod carrying a valve body that switches the flow of fluid between individual ports by coming in and out of contact with two opposite valve seats. The valve rod has an annular projection on which the valve body of elastic substance is to be fitted. While a first annular groove is provided on each side of the annular projection, a second annular groove is cut at the center of the annular projection. The valve body is bisected into two segments that are individually mounted on both sides of the second groove.

Abstract: A novel polymer having repeating units of the formula: ##STR1## (wherein R.sub.1 stands for a hydrogen atom or a methyl group) is produced by polymerizing N-tetrahydrofurfuryl acrylamide or N-tetrahydrofurfuryl methacrylamide. This is a hydrophilic-hydrophobic thermally reversible type polymer.

Abstract: Pyridazinone derivatives represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 represent a hydrogen atom, hydroxy group or alkoxy group of not more than 5 carbon atoms, or two of R.sub.1, R.sub.2 and R.sub.3 may be combined together to form a group of --O--CH.sub.2 --O-- or --O--CH.sub.2 --CH.sub.2 --O--, R.sub.4 represents an alkyl group, n represents an integer of 0 to 4 and the dotted line represents a single or double bond, or salts thereof.

Abstract: A compressor comprises a casing having an aperture, a compressor unit provided in the casing, and an electric motor for driving the compressor unit, the electric motor being provided in the casing together with the compressor unit. An iron joint is mounted to the aperture of the casing and is formed with an electrically conductive metal coating having a corrosion resistance greater than that of iron on the surface thereof. The iron joint is comprised of a cylindrical portion and a conical outer surface portion welded to the edge of the aperture by resistance welding. A pipe for sucking or discharging gas to or from the casing is brazed into the cylindrical portion of the iron joint with a copper brazing material.

Abstract: In a numerical control feed device, an objective velocity signal is produced from the difference between command pulses from a numerical controller, which indicative of an objective feed amount and an objective feed rate for a slide of a machine tool, and a feedback feed amount from a pulse generator driven by a servomotor. A subtraction circuit calculates a difference signal based on the objective velocity signal and a feedback velocity signal from a tachogenerator also driven by the servomotor and applies the difference signal to a drive amplifier for driving the servomotor. A frequency-voltage converter generates a feedforward velocity signal depending on the frequency of the command pulses. A gain adjustable amplifier amplifies the feedforward velocity signal at the amplifying ratio designated by the numerical controller and outputs the amplified feedforward velocity signal to the subtraction circuit for addition.

Abstract: A photometer in a camera having a plurality of light receiving portions on an identical substrate for conducting photo-metering for portions each corresponding to a marginal area and a central area of a picture plane in the camera.

Abstract: A method for producing large-area power semiconductor components, wherein at least two irradiation processes (neutron irridiation, ion implantation electron, .gamma.or proton irradiation) are used to produce the basic doping, to introduce deep pn junctions and to introduce recombination centers. It is precisely for the critical process steps (p-base, n-type stop layer) that the improved homogeneity of the layers signifies a higher yield and improved limit data for the finished components.

Abstract: A tapered rod producing process by which a tapered rod having a profile very near to an aimed profile can be produced with high accuracy. According to the process, during working of a wire diameter gradually decreasing portion of a tapered rod in which the diameter of a stock gradually decreases in a feeding direction of the stock, the drawing length of the stock from starting to ending of acceleration of variable speed feeding mechanism is made greater than predetermined length of the wire diameter gradually decreasing portion, and during working of a wire diameter gradually increasing portion in which the diameter of the stock gradually increases, the drawing length of the stock from starting to completion of deceleration of the variable speed feeding mechanism is made smaller than an a desired length of the wire diameter gradually increasing portion of the tapered rod.

Abstract: A method for separating a trihalogenobenzene isomer from a mixture of at least two trihalogenobenzene isomers selected from the group consisting of 1,2,3-, 1,2,4- and 1,3,5-substituted isomers among trihalogenobenzenes represented by the formula: ##STR1## wherein X is Cl or Br, by means of a zeolite adsorber, characterized in that a ZSM-zeolite is used as the adsorber.

Abstract: Process for increasing the room-temperature ductility of a workpiece composed of oxide-dispersion-hardened nickel-base superalloy and existing as coarse, longitudinally oriented columnar crystallites by subjecting the previously zone-annealed workpiece to a solution anneal in the temperature range between 1,160.degree. and 1,280.degree. C. under argon atmosphere for 1/2 h to 5 h and then to a purposefully chosen cooling down at a rate of 0.1.degree. C./min to 5.degree. C./min to a temperature of 500.degree. to 700.degree. C. Thereafter the workpiece is cooled down to room temperature in air. Preferred purposefully chosen cooling down rate: approx. 0.5.degree. C./min.

Abstract: A magnetic recording medium wherein a magnetic layer containing a particulate magnetic material and a binder is formed on a substrate exhibits improved performance as magnetic recording tape, disk, and sheet when the particulate magnetic material comprises particles having iron carbide at least on the surface thereof and optional oxide particles, and the particulate magnetic material contains 5 to 90% by weight of iron carbide in the form of Fe.sub.n C.

Abstract: Injection device used when a reactor is shut down to remove radioactive substances from within the gap between the internal piping and the inside of the nozzles of a RPV by injecting fluid towards the inside of these nozzles. The injection device is equipped with an injection nozzle that injects fluid towards the end of the gap, a casing that supports this injection nozzle, a suspension mechanism whereby the casing is movably suspended from above the RPV, a water feed device that supplies high-pressure fluid to the injection nozzle, a sensor or the like that senses when the casing is positioned directly above the internal piping and a fixing mechanism that temporarily fixes the casing to the inside wall of the RPV.

Abstract: Aliphatic aldehydes of the general formula I ##STR1## where R.sup.1 is hydrogen or methyl,R.sup.2 is a straight-chain or branched alkyl radical of 1 to 4 carbon atoms and the two radicals X are each hydrogen or together form a further C--C bond, in particular2,5,7,7-tetramethyloctanal,2,4,5,7,7-pentamethyloctanal,2-ethyl-5,7,7-trimethyloctanal and2,5,7,7-tetramethyl-2-octen-1-al, are used in scent compositions and are prepared by a process in which an aldehyde of the general formula II ##STR2## is condensed with an aldehyde of the general formula III ##STR3## in the presence of an aldol condensation catalyst to give the substituted octenal of the general formula I, and, if required, the latter is partially hydrogenated or reduced to give the ocorresponding octanal of the formula I.

Abstract: An automatic density control device in a copying machine combined with an automatic document feeder capable of feeding a document onto a document support table has a document density detector for detecting the density of a document placed on the document support table, a scanner means movable in a forward direction for exposure to the image of the document on the document support table and movable in a backward direction for enabling the document density detector means to read the density of the document on the document support table, a reference position detector for detecting when the scanner means reaches a reference position, and a controller for determining the density of the document from a document density signal from the document density detector means in a range prior to generation of a signal by the reference position detector means when the scanner means moves back to the reference position, for determining an amount of exposure or an image developing bias voltage based on the document density sign

Abstract: An electrode material made of a carbonaceous material that is obtained by the pyrolysis of an organic compound capable of forming the graphite structure is disclosed. This carbonaceous material is such that the spacing of (002) planes, d002, is at least 3.37 .ANG. and thecrystallite size in the direction of c axis, Lc, is not more than 220 .ANG., as determined by X-ray wide-angle diffractiometry, and the line width .DELTA.Hpp between peaks in the first differential of the absorption spectrum of electron spin resonance is at least 10 gauss. The electrode material made of such carbonaceous material is capable of providing a stable secondary battery that produces high electromotive force and which has high energy density.

Abstract: A headed steel pin for a multi-grip fastener of the pin and swageable collar type has a homogeneous microstructure, and consists substantially entirely of sorbitic tempered martensite. Suitable coarse-grained medium carbon steel is shaped to form a headed pin having a plurality of identical, regularly spaced, annular, combination grooves each able to function alternatively as a locking groove, a pulling groove, or a breaker groove. The shaped pin is heat treated, the steel rendered homogeneously martensitic and then tempered at a temperature approaching as closely as practicable to the lower critical temperature of the steel, to convert the martensitic steel entirely to sorbite. The finished pin has a suitable balance of brittleness, toughness, ductility and impact strength, and tends to break cleanly and reliably at a selected one of the combination grooves when the fastener is installed in a workpiece.

Abstract: A gallium alloy for dental restorations which is hardenable at mouth temperature or around 37.degree. C. or more after triturating multicomponent liquid gallium alloy with alloy powder, is disclosed. The mixture has a heterogeneous structure after hardening, and contains as the overall composition, 9-47% gallium, 1-35% indium, 0.2-38% tin and 1-68% silver as indispensable components and one or more elements selected from 0.4-35% palladium, 0.5-25% copper and 0.4-12% zinc as arbitrary components. The multicomponent liquid gallium alloy contains 45-85% gallium, 5-40% indium and 1-30% tin as fundamental components and small amounts one or more elements selected from silver, palladium, gold, platinium, copper, zinc and germanium as arbitrary components. The alloy powder contains 1-85% silver and two or more elements selected from 1-40% tin, 1-40% palladium, 1-30% copper, 1-15% zinc and 1-25% indium.

Abstract: A method for preparing an aqueous polyurethane dispersion, comprising (a) preparing a prepolymer with free NCO groups by reacting an aliphatic or cycloaliphatic polyisocyanate with a polyol, and an anionic compound; (b) dispersing said prepolymer in water; (c) reacting said water-dispersed prepolymer with a diamino hydrazide of the formula: ##STR1## wherein R is an alkylene group of 2 to 15 carbon atoms or a cycloalkylene or arylene group of 6 to 15 carbon atoms as a chain lengthening agent; (d) reacting the prepolymer of step (c) in said dispersion with formaldehyde to effect crosslinking.

Abstract: A graphic fluorescent display device is disclosed which is capable of effectively eliminating a streak pattern occurring right below cathodes. The fluorescent display device is constructed in such a manner that an electric field controlling electrode is disposed on the surface of a cover plate opposite to a substrate having anodes formed thereon, and potential positive with respect to the cathodes is applied to the electric field controlling electrode so that electrons emitted from the cathodes may be diffused by the positive electric field of the electric field controlling electrode.

Abstract: An inductance device comprises a coil wound on a magnetic core; and an electrode layer made of a metal foil bonded on an end surface of said magnetic core on which an end of said coil and an end of a lead wire are soldered on said metal foil.