Abstract: The invention provides a friction material containing a fibrous reinforcement, a friction modifier, and a binder as major components, which does not contain asbestos fibers but contains, as an organic friction modifier, para-, meta- and meta-para-type aramide resin dusts independently or as a mixture thereof. It is preferred to mix the para-type and m-type aramide resin dusts independently or as a mixture in an amount of 1 to 60% by volume based on the volume of the whole friction material.

Abstract: A plurality of thermal power generation plants 100 are provided with a communication terminal 200 and a function of controlling respectively a boiler control unit 110, a turbine control unit 120 and an auxiliary machine sequence control unit 130 based on an operation signal inputted via the communication terminal 200. A remote control center 10 which is connected to the communication terminal 200 via the Internet 300, accessses the control units and remotely controls operating states including starting and stopping of the concerned thermal power generation plant 100.

Abstract: A friction material comprising a fibrous reinforcement, a friction modifier and a binder, characterized by being free from asbestos fiber and containing, as the organic fibrous reinforcement, a mixture of a dry aramid pulp with at least one member selected from the group consisting of a wet aramid pulp, a woodpulp and an acrylic pulp.

Abstract: An object is to realize acoustic noise reduction under a wide range of rotating speeds and together with PWM control. A signal (VCTL1) is generated as a trapezoidal wave repeatedly rising and falling in each given electrical angle section extending before and after the current-supply pattern is switched in accordance with the electrical angle of a rotor of a motor, and a signal (VCTL2) is generated in the opposite phase. A control circuit (22) appropriately selects among the signals (VCTL1 and VCTL2) and a given signal (SCTL) and inputs them to comparators (59 to 61). The comparators (59 to 61) compare the input signals with a carrier signal (B6) provided as a triangular wave. Switch elements for controlling the current-supply pattern to the motor turn on/off on the basis of output signals (C1 to C6) from the comparators (59 to 61). As a result, the current-supply pattern is switched softly by PWM control in the electrical angle section mentioned above.

Abstract: Poly(3-hydroxybutanoic acid) having a number average molecular weight of not less than 500,000 is oriented at a draw ratio of 2-fold or more to reproducibly obtain a film made of poly(3-hydroxybutanoic acid) having biodegradability and biocompatibility as well as sufficient strength and flexibility (for example, tensile strength of not less than 30 MPa and elongation to break of not less than 15%).

Abstract: An operating method of a combined plant that has several gas turbines and exhaust heat recovery boilers which generate steam by exhaust gas from the gas turbines wherein exhaust gas from each of the heat recovery boilers is passed through exhaust gas ducts and discharged from a common chimney. The method includes operating a combined plant having plural axes which may be suitably started or stopped and having means for discharging exhaust gas from three or more gas turbines through one common chimney. When the pressure at a joining part of an exit duct of an exhaust heat recovery boiler is a positive pressure or the atmospheric temperature is higher than a preset atmospheric temperature, gas turbines can be re-started or stopped without back-flow of exhaust gas of the gas turbine.

Abstract: It is an object to enable efficient driving even if the rotation speed is variable in a driving circuit for a DC brushless motor having no position detection. The counterelectromotive force of the motor M is received by the comparators (201-203) and the trigger signals (G1 and G2) are outputted with 120.degree. cycle in synchronization with the rotation. Two oscillation signals (N1 and N2) in synchronization with the rotation of the motor are generated therefrom and a serial control signal (CNT) which becomes active/inactive for every 30.degree. is further produced in the 30.degree. signal operation circuit (104). The control signal (CNT) is serial/parallel converted into conversion control signals (L1-L3) in the 180.degree. signal conversion circuit (105). The 120.degree. switching circuit (1116) further converts them into driving signals (K1-K6) and applies them to the current control portion (300). The motor is driven by a signal delayed by a rotation angle of 30.degree.

Abstract: A color video printer has a liquid crystal body acting as a shutter extending across a color printing paper. The liquid crystal body includes a first shutter array for a first color, a second shutter array for a second color, and a third shutter array for a third color, and an electrical arrangement for supplying first, second, and third color signals to the respective first, second, and third shutter arrays. Relative motion between the liquid crystal body and the color printing paper is provided in a direction to cause the liquid crystal body to scan the paper.

Abstract: A device which includes a polarizer wherein one of a pair of transmission faces of a transparent substrate by a light beam on which a polarizing separating film is not formed is formed in an inclined relationship with respect to the other transmission face of the transparent substrate on which the polarizing separating film is formed and a parallel light beam having a predetermined incident angle with respect to the polarizing separating film is passed through the polarizing separating film to effect polarized light separation. Two such devices are provided and a Faraday rotator is provided between the two devices to constitute an optical isolator.

Abstract: In an optical atmospheric link system for transmitting a light beam carrying an information signal between a transmitter and a receiver which is located apart from the transmitter, the transmitter includes a light source for generating the first light beam modulated with the information signal, a first optical system for transmitting the light beam toward the receiver, a second optical system for turning at least a portion of the light beam, and a third optical system for observing the light beam turned by the second optical system and the receiver.

Abstract: An image input apparatus is disclosed, which comprises a running roller manually rolled along an image information surface for the scanning thereof, position detecting means for detecting the position of the running roller according to the rotation thereof, a line sensor for reading out image information of the image information surface, a line sensor driving circuit for driving the line sensor according to a control pulse signal having a constant cycle period, and memory means for storing the output of the line sensor. The output of the position detecting means is utilized as address data of a memory to accurately store image information in the memory.

Abstract: A pickup assembly for a disc player includes a magnetic circuit for generating magnetic fluxes perpendicular to each other, a first coil group through which a current flows in a direction perpendicular to the magnetic fluxes, a second coil group through which a current flows in a direction perpendicular to one of the magnetic fluxes, a third coil group through which a current flows in a direction perpendicular to the other of the magnetic fluxes, a bobbin on which the first, second and third coil groups are wound, and a supporting member for supporting the bobbin so as to be movable in the three ways as along X-, Y- and Z axes.

Abstract: Apparatus for controlling a tone arm in a record playing device of the linear tracking pickup type includes a pair of guide rails; a carriage slidably mounted on the guide rails; a pickup assembly mounted on the carriage and including a support mechanism for supporting the tone arm for horizontal movement with respect to a record disc; a linear drive motor for linearly driving the carriage along the guide rails in the horizontal direction with respect to the record disc; a motor drive circuit for controlling the energization of the linear drive motor; an offset angle detecting device for detecting an offset angle of the tone arm and for generating an offset angle output in response thereto; a first switch circuit for supplying the offset angle output to the motor drive circuit when the tone arm traces the record disc to drive the linear drive motor so as to compensate for the detected offset angle; an inclination detecting circuit for detecting an inclination of the carriage with respect to the record disc an

Abstract: Apparatus for controlling a tone arm is provided with a horizontal drive motor for moving the tone arm in the horizontal direction, a horizontal velocity detector connected to the same rotating shaft as the tone arm so as to move concurrently with both the tone arm and the horizontal drive motor, a control circuit having a motional feedback loop to energize the horizontal drive motor in accordance with a desired pre-set velocity signal and a fedback detected velocity signal.

Abstract: A tone arm assembly provided with a motor for moving a tone arm in a horizontal direction with respect to a record disc, a servo circuit for keeping the moving velocity of the tone arm constant, and a positioning servo circuit to operate when the tone arm reaches a reproducing position, in which the positioning servo circuit and the velocity controlling servo circuit are combined together thereby to stop the tone arm quickly at a predetermined position.