摘要:
An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 μm, and a high nonlinear susceptibility χ3 equal to or greater than 1×10−12 esu, and uses tellurite glass having sufficient thermal stability for processing into a low loss fiber, employs a PCF structure or HF structure having strong confinement into a core region. This enables light to propagate at a low loss. The size and geometry of air holes formed in the core region, and the spacing between adjacent air holes make it possible to control the zero dispersion wavelength within an optical telecommunication window (1.2-1.7 μm), and to achieve large nonlinearity with a nonlinear coefficient γ equal to or greater than 500 W−1 km−1.
摘要:
An optical fiber, which has a zero-material dispersion wavelength equal to or greater than 2 μm, and a high nonlinear susceptibility χ3 equal to or greater than 1×10−12 esu, and uses tellurite glass having sufficient thermal stability for processing into a low loss fiber, employs a PCF structure or HF structure having strong confinement into a core region. This enables light to propagate at a low loss. The size and geometry of air holes formed in the core region, and the spacing between adjacent air holes make it possible to control the zero dispersion wavelength within an optical telecommunication window (1.2-1.7 μm), and to achieve large nonlinearity with a nonlinear coefficient γ equal to or greater than 500 W−1 km−1.
摘要:
A fabrication method of an optical fiber using as a core material tellurite glass. The method includes a first process of molding a tellurite glass melt into a mold, the mold having a plurality of convex portions defining an inner wall, which portions run parallel to each other in a longitudinal direction in order to make a polygon columnar glass preform, and a second process of inserting the glass preform into a cylindrical jacket tube made of tellurite glass and carrying out fiber-drawing under pressure so as to maintain or enlarge air holes which are gaps generated between the glass preform and the jacket tube.
摘要:
A motion assisting device or the like, wherein the asymmetry degree of the motion patterns of human limbs is evaluated according to the variation patterns of the values of a pair of posture variables which vary with the postures in the respective same locations of the limbs. Furthermore, the evaluation result of the degree of the asymmetry can be utilized as the foundation of the motion control of the actuator of the motion assisting device. As a result, the motion of the human limbs can be assisted by the motion assisting device in such a manner that the balance of the motion patterns of the limbs is adjusted.
摘要:
A shift control system for a vehicle transmission with multiple gear trains and a main shaft connected to an engine crankshaft through a clutch. The shift control system allowing shifting without disengaging the clutch. In conducting a shifting operation through a roller synchro mechanism associated with a gear train, the number of revolutions per minute of the engine crankshaft is promptly decreased through at least one of an ignition control device and a fuel supply control means to synchronize the number of revolutions per minute of a main shaft and a counter shaft of the transmission when the number of revolutions per minute of the main shaft is larger than the number of revolutions per minute for synchronizing with the counter shaft and the number of revolutions per minute of the engine crankshaft is increased to synchronize the number of revolutions per minute of the main shaft and the counter shaft when the number of revolutions per minute of the main shaft is less than the number of revolutions per minute for synchronizing with the counter shaft. This enables a prompt shifting.
摘要:
A facsimile communication system and method in which facsimile information from original documents is sequentially transmitted from a transmitter to a remote receiver. The transmitter is utilized for changing the data transfer speed of the facsimile information in accordance with an instruction signal provided by the remote receiver. The remote receiver supervises the error rate level of each unit of facsimile information of the original documents and provides the instruction signal when the error rate level is detected to exceed a reference error rate level.
摘要:
A motion assisting device or the like, wherein the asymmetry degree of the motion patterns of human limbs is evaluated according to the variation patterns of the values of a pair of posture variables which vary with the postures in the respective same locations of the limbs. Furthermore, the evaluation result of the degree of the asymmetry can be utilized as the foundation of the motion control of the actuator of the motion assisting device. As a result, the motion of the human limbs can be assisted by the motion assisting device in such a manner that the balance of the motion patterns of the limbs is adjusted.
摘要:
A system adapted to control a control valve for controlling the quantity of supplementary air being supplied to an internal combustion engine, in a feedback manner responsive to a difference between actual engine rpm and desired engine rpm at engine idle. The above control valve is opened in synchronism with a signal indicative of a predetermined rotational position of the engine. The system is also adapted to detect a total quantity of suction air including the supplementary air being supplied to the engine, in synchronism with the above predetermined rotational position signal, to supply a quantity of fuel corresponding to the detected total suction air quantity. Further, the system is adapted to start opening the control valve upon a lapse of such a period of time after each pulse of the predetermined engine rotational position signal has been inputted to the system that a proper value of the total suction air quantity can be detected at the time of inputting of the next pulse of the same signal to the system.