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, accesses the control units and remotely controls operating states including starting and stopping of the concerned thermal power generation plant 100.
Abstract:
A motor driving circuit includes an induced voltage detecting circuit for detecting induced voltages in a motor; a rotation speed/phase detecting circuit and an output matrix circuit for generating a plurality of control signals in response to the detection result of the voltage detecting circuit; a current control circuit for generating current control command values in response to the control signals; and a current detecting circuit for detecting output currents that are driving the motor, and for controlling output transistors in response to its detection result and the current control command values. The motor driving circuit can sharply reduce the driving noise of the motor with improving the efficiency of the motor drive by shaping the output currents in a sinusoidal waveform.
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:
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. Also, the receiver includes a first detector for receiving the first light beam transmitted from the transmitter through the first optical system, detecting a relative position of the first light beam received and the receiver and for generating a position error signal, a second light source for generating a second light beam modulated with the position error signal, and a second optical system for transmitting the second light beam generated by the second light source toward the transmitter, wherein the transmitter further includes a second detector for receiving the second light beam transmitted from the receiver through the second optical system and demodulating the second light beam to obtain the position error signal, and a position control circuit for controlling a position of the transmitter according to the position error signal obtained by the second detector so that the light beam is directed toward the receiver.
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 friction material is provided with a baked carbonized organic material as the binder thereof. The friction material has a degree of compression deformation at room temperature of from 0.3 to 2.5% under a load of 4 MPa and from 1.0 to 4.5% under a load of 10 MPa. The compression deformation ratio of the degree of compression deformation at 300° C. to the degree of compression deformation at room temperature is from 1.0 to 1.5 under a load of from 1 to 10 MPa. The baking carbonization step comprises carbonizing an organic material in any atmosphere of vacuum, reducing gas or inert gas at a temperature of from 550° C. to 1300° C. with applying a load thereto.
Abstract:
In a friction material, columnar or scaly non-whisker-like alkali metal titanate or non-whisker-like alkali metal.alkaline-earth metal titanate having an average particle diameter in the range of 0.1 to 100 μm and an aspect ratio of 3 or less and an inorganic porous filler are compounded, and a friction material in which non-whisker-like lithium.potassium titanate having an average particle diameter in the range of 0.1 to 100 μm and an aspect ratio of 3 or less is compounded.
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. not according to the number of rotation of the motor.
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.