Abstract: A load test machine includes a base block, at least a pair of posts rising from the base block, a cross head spanning between the pair of posts, and an actuator mounted on the base block or the cross head. The actuator is able to apply a load on a test piece positioned between the cross head and the base block. The cross head is secured to each of the posts via an elastic member, and the elastic member is constructed to be changeable in its jointing position with the cross head or with each of the posts to change a resonance frequency of the test machine.

Abstract: The number of components of a high frequency power amplifier is reduced. A bias resistance ratio is adjusted in accordance with a change in the threshold voltage Vth of a transistor. A high frequency power amplifier has a plurality of amplifying systems. Each of these systems has an input terminal to which a signal to be amplified is supplied, an output terminal, a bias terminal, a plurality of amplifying stages which are sequentially cascaded between the input and output terminals, and a bias circuit connected to the bias terminal and each of the amplifying stages to apply a bias potential to the amplifying stage. The amplifying stage includes a control terminal for receiving an input signal and the bias potential supplied to the stage and a first terminal for transmitting an output signal of the stage.

Abstract: An entry board for use in drilling small holes in boards: the entry board comprises a lubricant layer of a mixture of a polyethylene glycol having an average molecular weight of at least 3000 to less than 10000, a polyethylene glycol having an average molecular weight of at least 10000 and trimethylolpropane formed over at least one surface of an aluminum base board with an undercoat layer of a partially saponified product of polyvinyl acetate provided between the lubricant layer and the base board. The partially saponified polyvinyl acetate has a degree of saponified 15 to 70 mole % and has an average molecular weight of 9000 to 50000. The adhesion of the lubricant layer to the base board is excellent, and the lubricant layer prevents cracking.

Abstract: A method of manufacturing a semiconductor device able to reduce the number of manufacturing steps and attain the rationalization of a manufacturing line is disclosed. The semiconductor device is a high-frequency module assembled by mounting chip parts (22) and semiconductor pellets (21) onto each of wiring substrates (2) formed on a matrix substrate (27) after inspection. A defect mark (2e) is affixed to a wiring substrate (2) as a block judged to be defective in the inspection of the matrix substrate (27), then in a series of subsequent assembling steps the defect mark (e) is recognized and the assembling work for the wiring substrate (2) with the defect mark (2e) thereon is omitted to attain the rationalization of a manufacturing line.

Abstract: A method of manufacturing a semiconductor device able to reduce the number of manufacturing steps and attain the rationalization of a manufacturing line is disclosed. The semiconductor device is a high-frequency module assembled by mounting chip parts (22) and semiconductor pellets (21) onto each of wiring substrates (2) formed on a matrix substrate (27) after inspection. A defect mark (2e) is affixed to a wiring substrate (2) as a block judged to be defective in the inspection of the matrix substrate (27), then in a series of subsequent assembling steps the defect mark (e) is recognized and the assembling work for the wiring substrate (2) with the defect mark (2e) thereon is omitted to attain the rationalization of a manufacturing line.

Abstract: The number of components of a high frequency power amplifier is reduced. A bias resistance ratio is adjusted in accordance with a change in the threshold voltage Vth of a transistor.

Abstract: A load test machine includes a base block, at least a pair of posts rising from the base block, a cross head spanning between the pair of posts, and an actuator mounted on the base block or the cross head. The actuator is able to apply a load on a test piece positioned between the cross head and the base block. The cross head is secured to each of the posts via an elastic member, and the elastic member is constructed to be changeable in its jointing position with the cross head or with each of the posts to change a resonance frequency of the test machine.

Abstract: The number of components of a high frequency power amplifier is reduced. A bias resistance ratio is adjusted in accordance with a change in the threshold voltage Vth of a transistor. A high frequency power amplifier has a plurality of amplifying systems. Each of these systems has an input terminal to which a signal to be amplified is supplied, an output terminal, a bias terminal, a plurality of amplifying stages which are sequentially cascaded between the input and output terminals, and a bias circuit connected to the bias terminal and each of the amplifying stages to apply a bias potential to the amplifying stage. The amplifying stage includes a control terminal for receiving an input signal and the bias potential supplied to the stage and a first terminal for transmitting an output signal of the stage.

Abstract: An entry board (1) for use in drilling small holes in boards. A lubricant layer (4) of a mixture of a polyethylene glycol having an average molecular weight of at least 3000 to less than 10000, a polyethylene glycol having an average molecular weight of at least 10000 and trimethylolpropane is formed over at least one surface of an aluminum base board (2), with an undercoat layer (3) of a partially saponified product of polyvinyl acetate provided between the layer and the base board. The partially saponified product of polyvinyl acetate is 15 to 70 mole % in the degree of saponification and 9000 to 50000 in average molecular weight. The entry board (1) is excellent in the adhesion of the lubricant layer (4) to the base board (2), and the lubricant layer (4) is prevented from cracking.

Abstract: A cyanoiminoquinoxaline derivative of the formula (II) is useful as a preventive or therapeutic agent for diseases due to hyperexcitation of glutamate receptors. (wherein, X and Y each is independently O or NCN, provided that at least one of X and Y is NCN; R1, R2, R3, and R4 each is independently hydrogen, halogen, nitro, optionally substituted heterocyclic group etc.; R5 is hydrogen etc.; R1 and R2, R2 and R3, R3 and R4, and R4 and R5, each taken together with the adjacent atoms may form a carbocycle which may be substituted or may contain a heteroatom(s).

Abstract: A method of manufacturing a semiconductor device able to reduce the number of manufacturing steps and attain the rationalization of a manufacturing line is disclosed. The semiconductor device is a high-frequency module assembled by mounting chip parts (22) and semiconductor pellets (21) onto each of wiring substrates (2) formed on a matrix substrate (27) after inspection. A defect mark (2e) is affixed to a wiring substrate (2) as a block judged to be defective in the inspection of the matrix substrate (27), then in a series of subsequent assembling steps the defect mark (e) is recognized and the assembling work for the wiring substrate (2) with the defect mark (2e) thereon is omitted to attain the rationalization of a manufacturing line.

Abstract: When one piston 3A and 3B moves to the forward edge by the pressured fluid supplied to the head side pressured chamber 5A and 5B, two communicating paths 11A and 11B communicates the head side pressured chamber 5A and 5B with the rod side pressured chamber 5B and 5A of other piston 3B and 3A. In a rod holding unit plate, the rod holding unit plate is provided such that one engaging unit 21A and 21B of the rod holding unit plate is in sliding contact with the side surface of this piston rod 4A and 4B to regulate the oscillation during one piston rod 4A and 4B is making forward or is setting back. At the same time, the rod holding unit plate is provided such that other engaging unit 21B and 21A of the rod holding unit plate 21 is engaged in the hollow 25 of other piston rod 4B and 4A located at the forward edge to engage the returning operation of the piston rod.

Abstract: A material testing machine has a movable, load applying block and a fixed, load sensing block. The load sensing block has a body with sufficient volume and mass and a small sensing projection provided on the body. The sensing projection is much smaller than the body and has a side surface on which strain gages are affixed. A test piece is installed to the material sensing projection such that any load applied to the test piece may be transmitted to the sensing projection to cause a corresponding strain of the sensing projection. Any strain of the sensing projection, which may be either static strain or dynamic strain, can be determined from the outputs of the strain gages. The determined strain of the sensing projection is used to derive the load transmitted to the sensing projection and thus the load applied to the test piece.

Abstract: The number of components of a high frequency power amplifier is reduced. A bias resistance ratio is adjusted in accordance with a change in the threshold voltage Vth of a transistor.

Abstract: A two-drive-system fluid pressure chuck including two sets of jaw members capable of chucking a workpiece from two directions X and Y. The chuck includes two cylinder apparatuses, a first rod, a second rod, and a cam member. The first rod being slidably disposed within the inside of the second rod. The cam member is formed at the tip of each rod and is used to convert the reciprocal operation of each rod into the opening and closing operations of the jaw members. A notch is formed in the side of the second rod, and the cam member of the first rod protrudes out from the second rod through this notch to connect to the jaw member.

Abstract: Pinching of the fingers of an air chuck is prevented during opening or closing in order to allow them to open or close smoothly and to miniaturize the air chuck. In a linear guide air chuck having a rod that is operated by an air cylinder mechanism; a pair of fingers is provided that can be opened and closed to grip a workpiece; a guide mechanism moves the fingers linearly to open or close them; and a pair of levers convert operation of the rod into the opening and closing operation of both fingers the lever and finger being coupled together by fitting a spherical engagement element formed on the lever so, in a circular engagement hole cut in the top surface of the finger, at a position at which the acting force of the lever can be transmitted to the finger at nearly the same height as that of the guide mechanism.

Abstract: A process for the preparation of 3-isoxazolecarboxlic acid which is an intermediate for prepearing useful compounds is provided, said process being characterized in that a compound of formula (I) is reacted with hydroxylamine to obtain a compound of formula (II), and the compound thus obtained is treated with an alkali: ##STR1## wherein R.sup.1 is a lower alkyl, R.sup.2 is a carboxy protecting group, X is a halogen atom, and Y is a hydrogen atom, or X and Y together may form a single bond.

Abstract: A process for the preparation of 3-isoxazolecarboxlic acid which is an intermediate for prepearing useful compounds is provided, said process being characterized in that a compound of formula (I) is reacted with hydroxylamine to obtain a compound of formula (II), and the compound thus obtained is treated with an alkali: ##STR1## wherein R.sup.1 is a lower alkyl, R.sup.2 is a carboxy protecting group, X is a halogen atom, and Y is a hydrogen atom, or X and Y together may form a single bond.

Abstract: An oxopyridinylquinoxaline derivative represented by the following Formula I or pharmaceutically acceptable salts thereof: ##STR1## wherein R.sup.1 is hydrogen, halogen, nitro, or trihalomethyl; R.sup.2 is hydrogen, halogen, nitro, cyano, trihalomethyl, carbamoyl, carbamoyl substituted with lower alkyl, sulfamoyl, or sulfamoyl substituted with lower alkyl; R.sup.3 is hydrogen, nitro, or halogen; R.sup.4 is hydrogen, lower alkyl, substituted lower alkyl, lower cycloalkyl, or substituted lower cycloalkyl; R.sup.5 's are substituents independently selected from the group consisting of halogen, nitro, cyano, lower alkyl, carbamoyl, and carbamoyl substituted with lower alkyl; and n is an integer of 0 to 4. The derivative works as an antagonistic agent against both the NMDA receptors and the AMPA receptors, so that it is effective as a therapeutic agent for neurological disorders caused by excitatory amino acids binding to the receptors.

Abstract: A field emission element including an electrode structure made of a thin film exhibiting increased adhesive strength. A thin film of niobium nitride (NbN) is formed on a glass substrate by sputtering or the like. The NbN film exhibits increased adhesive strength to a degree sufficient to prevent etching for formation of the film into electrodes from causing peeling of the film.