Abstract: To provide a magnetic encoder which can be assembled having a thin-walled structure while securing an excellent detection sensitivity and which can provide an excellent moldability by suitably selecting materials, the magnetic encoder is provided which includes a multi-pole magnet 14 having a plurality of opposite magnetic poles alternating in a direction circumferentially thereof, and a core metal 11 for supporting the multi-pole magnet. The multi-pole magnet 14 contains a powdery magnetic material mixed in an amount within the range of 20 to 90 vol. % relative to the total volume of the multi-pole magnet 14. The multi-pole magnet 14 may be a sintered magnet.

Abstract: To provide a magnetic encoder that has an increased detecting sensitivity, can be thin-walled, have an increased reliability and an increased durability, can easily be handled during manufacture and assembly and is excellent in productivity, the magnetic encoder (10) includes a multi-pole magnet element (14) having opposite magnetic poles alternating with each other in a circumferential direction, and a core metal (11) for supporting the multi-pole magnet element (14). The multi-pole magnet element (14) is made of a sintered element prepared by sintering a powdery mixture of a powdery magnetic material and a powdery non-magnetic metallic material.

Abstract: A power transmission shaft is constructed by winding a membrane, film, foil or thin sheet in layers and comprising a longitudinal middle portion composed of FRP layers alone, a transitional portion disposed between the middle portion and each endportion and composed of a composite layer of FRP layers and metal layers, the end portions being composed of metal layers alone. The joining, as by welding, pinning, press-fitting, or friction welding, of metal ports, such as joint elements, is effected at the ends or the ends and transitional portions.

Abstract: A fiber reinforced plastic pipe is provided to prevent it from being damaged and make full use of its practical performance when the fiber reinforced plastic pipe, reduced in thickness and increased in diameter by pultrusion process, is reduced in the circumferential direction and inserted into a metal pipe. The fiber reinforced plastic pipe, reduced in thickness and increased in diameter by pultrusion process, includes a fiber bundle spun and aligned in the longitudinal direction, and circumferential reinforced fiber sheet provided at least on one of the outer and inner surface layers. The circumferential reinforced fiber sheet is inserted into the metal pipe to form a power transmission shaft such as an intermediate shaft for use with a propeller shaft or a drive shaft.

Abstract: A power transmission shaft to be used mainly in vehicles comprises metal joint elements and a metal pipe connected to each other. A fiber reinforced plastic pipe having a large flexural modulus of elasticity is inserted into the metal pipe, thus forming a composite FRP shaft having flexural rigidity sufficient to serve as a power transmission shaft.

Abstract: A propeller shaft has a metal pipe (1) with a joint element (3) joined at an end thereof. A fiber reinforced plastic layer (5) having a thickness that achieves a flexural rigidity satisfying a required natural bending frequency is formed on an outer circumference of the metal pipe (1) satisfying a static torsional strength required as a propeller shaft. The fiber reinforced plastic layer (5) has an interface strength between the reinforcing fiber and the matrix within a range of 20 to 200 MPa as measured by the microdroplet method.

Abstract: The present invention relates to a process for producing a 4-quinolone derivative, comprising allowing an o-aminoacetophenone derivative to react with a formic acid in an aprotic solvent in the presence of a suitable base, and adding a protic solvent to the reaction mixture. This is a simple process for producing 4-quinolone derivatives, applicable to large-scale commercial production.

Abstract: In a write operation, input data sequences "00", "01", "10", and "11" are converted into identification number groups "00", "02", "20", and "22", respectively, and the individual figures are stored in a pair of three-level memory cells. If a data error occurs during a read operation, the probable transition is only a transition from an upper state in which electric charge is stored in a memory cell to a lower state in which electric charge is reduced, i.e., only a first transition of only one of the identification numbers from state "2" to state "1" or from state "1" to state "0". Error correction is performed by taking account of this property, and a correct data sequence is output. This allows very efficient and accurate error correction when multi-level data using three or more values is written or read out.

Abstract: A method for manufacturing an SOI semiconductor substrate and a manufacturing apparatus therefor in which a mean implantation depth and a dose of each of a series of oxygen ion implantations are continuously or stepwise changed, a depthwise distribution of an oxygen atom concentration has a single peak and uniform in a plane at a predetermined depth, a maximum oxygen atom concentration is preferably no larger than 2.25.times.10.sup.22 atoms/cm.sup.3 and no smaller than 1.0.times.10.sup.22 atoms/cm.sup.3, a total oxygen dose is equal to a desired thickness of a buried oxide film multiplied by 4.48.times.10.sup.22 (in ions/cm.sup.3), and preferably a thermal process at a temperature of 1300.degree. C. or higher is applied after the completion of the oxygen ion implantation to form the buried oxide film.

Abstract: In a timer device having a timer sleeve at a housing with a timer piston slidably provided at the timer sleeve, a high pressure chamber is constituted by securing to the housing a high pressure side cover member constituted as an integrated part of the timer sleeve. The high pressure chamber and a passage at the housing communicating with a chamber are connected to each other by a passage formed in high pressure side cover member. A check valve for absorbing shock waves generated within the high pressure chamber is provided in the passage in the high pressure side cover member. The passage can be designed and manufactured with ease, and at the same time, the timer piston and the check valve can be separately designed and manufactured. Furthermore, stable operation of the check valve is achieved.

Abstract: The composition of the present invention is a thermoplastic elastomer composition obtained by dynamically crosslinking (A) 51-95% by weight of a thermoplastic polyester elastomer and (B) 49-5% by weight of a rubber during kneading. The composition is excellent in all of hardness, tensile strength, tensile elongation, compression set, thermal aging resistance, oil resistance and molded product appearance, and is suitably used as a material for automobile parts such as joint boot and the like.

Abstract: A process for producing a semiconductor substrate, including the phases of implanting oxygen ions into a semiconductor silicon substrate through one surface thereof to form a high oxygen concentration layer in the semiconductor silicon substrate, and then heat-treating the semiconductor substrate to cause a chemical reaction to occur between the implanted oxygen ions and the silicon, thereby forming an insulating silicon oxide film in the semiconductor silicon substrate, wherein the heat treatment phase includes at least a heat treatment step using an atmosphere having an oxygen partial pressure of 5.times.10.sup.3 Pa or more.

Abstract: Disclosed are pyridinecarboximidamides having a vasodilating effect (hypotensive activity or antianginal activity), and acid adduct salts thereof. ##STR1## wherein when R.sup.1 represents an alkyl, hydroxyalkyl, carboxyl, amino, acylamino, alkylamino, dialkylamino, aralkylamino, alkylsulfonamide, bisalkylsulfonylamino or hydroxyl group, R.sup.2 represents a hydrogen atom and R.sup.3 represents a nitroxyl, 2-chlorophenyl or phenyl group; andwhen R.sup.1 represents a hydrogen atom, R.sup.2 represents an alkyl, hydroxyalkyl, carboxyl, amino, acylamino, alkylamino, dialkylamino, aralkylamino, alkylsulfonamide, bisalkylsulfonylamino or hydroxyl group and R.sup.3 represents a nitroxyl, 2-chlorophenyl or phenyl group.There is also disclosed the use of the compounds represented by the formula (I) for antihypertensive or antianginal purpose.

Abstract: A thermoplastic elastomer composition comprising (A) 50-98% by weight of a thermoplastic polyester elastomer, (B) 50-2% by weight of a rubber and (C) a polyorganosiloxane in a proportion of 0.01-10 parts by weight per 100 parts of the total of the components (A) and (B). The above thermoplastic elastomer composition enables one to improve the flexibility and compression set of the thermoplastic polyester elastomer excellent mechanical properties, heat resistance and oil resistance without impairing the abrasion resistance of the thermoplastic polyester elastomer.

Abstract: Novel diphenylmethyl piperazine derivatives of this invention have a chemical structure represented by the following Formula [I]: ##STR1## wherein R represents ##STR2## The compounds have an effect of inhibiting the overcontraction and overextension of the myocardium without being accompanied by a myocardium-inhibiting effect. By using the novel diphenylmethyl piperazine derivatives as an effective ingredient, it is possible to obtain a myocardial necrosis inhibitor which can protect against myocardial necrosis, and a drug for the treatment and prevention of acute myocardial infarction.

Abstract: A magnetic sensor includes a sensor housing having a front end directed toward a member to be sensed. A magneto-electric transducer is mounted in the sensor housing and disposed adjacent to the front end of the sensor housing. A magnetic flux-collecting chip of a high-permeability material is supported on the front end of the sensor housing. The magnetic flux-collecting chip is disposed forwardly of the magneto-electric transducer. The magnetic flux-collecting chip has an exposed front face directed away from the magneto-electric transducer. The sensing ability or performance of the magneto-electric transducer is substantially determined by a magnetic gap between the front face of the magnetic flux-collecting chip and the member to be sensed.