Abstract: A feedback-type optical fiber amplifier using hybrid pumping light beams disclosed, including: an optical line through which an optical signal is propagated; a plurality of rare-earth-doped fibers, doped with a predetermined rare earth ion, being coupled to the optical line in series; a plurality of pumping light sources for outputting pumping light beams having wavelengths different from each other; a plurality of optical coupling means for coupling the pumping light beams to the optical line; and feedback means for dividing the pumping light beam outputted through at least one of the rare-earth-doped fibers, and looping it back to corresponding rare-earth-doped fiber as its input. Therefore, the length of fiber constructing the optical fiber amplifier is reduced, and the amplification efficiency is improved.

Abstract: The present invention relates to a smart battery charging system, a charging method therefor and a power supply system for portable computer using the same that executes various charging operations securely corresponding to types of the smart batteries connected to the notebook computer. A smart battery charger 60 supplies charging voltage and charging current to the smart battery 70 selectively by controlling data input through an SM bus. The smart battery charger 60 and the smart battery 70 are connected to a keyboard controller 80 through the SM bus. The keyboard controller 80 determines the power on-off status of the notebook computer, based on second power voltage outputted from an SMPS 130, and identifies the types of the smart batteries, based on battery identifying signals outputted from the smart battery charger 60.

Abstract: An optical fiber amplifier is disclosed including: an optical line through which an optical signal is transmitted; a rare-earth-doped fiber, doped with a predetermined rare earth ion, being set on the optical line; a pumping light beam source for generating a pumping light beam having a predetermined wavelength; a first multiplexer for coupling the pumping light beam to the optical line; a second multiplexer for dividing the pumping light beam outputted from the rare-earth-doped fiber; and pumping light beam looping means for looping the pumping light beam divided by the second multiplexer back to the rare-earth-doped fiber. The residual pumping light beam outputted from the rare-earth-doped pumping light beam is looped back by the feedback loop or reflection loop, to be reprovided to the rare-earth-doped fiber through the multiplexer.

Abstract: The proposed machine comprises a chamber accommodating a headstock and a tailstock. The headstock has a rotation drive, whereas the tailstock is capable of longitudinal movement along a guide. The machine also includes a rod carrying a spray gun capable of lateral reciprocations by a drive in guides secured on the carriage capable of moving longitudinally by a drive along a guide. The tailstock has a hole, whereas a table of a size smaller than the dimensions of the hole is secured on the guide. A rear wall of the chamber has a longitudinal slot, the chamber having a gate capable of longitudinal displacement and engageable with a hollow pusher secured on the carriage and receiving the rod. The drives are arranged at the outer side of the rear wall of the chamber.

Abstract: A single - stroke pneumatic apparatus comprises a hollow cylindrical frame 1) in which is mounted for reciprocating back and forth a striker (2) forming in the frame (1) front and rear chambers (3 and 4), the front chamber (3) has its own inlet and outlet ports (5 and 6) and the rear chamber (4) has its own ports (7 and 8). A directional flow control sleeve (10) fitted outside the frame (1) is arranged to uncover and cover the inlet and outlet ports (5, 6, 7, 8). The directional flow control sleeve (10) is provided with front and rear longitudinal internal passages (11 and 12) and front and rear radial holes (13 and 14).

Abstract: A lighting system comprises gaseous discharge lamps (8) connected to a source (1) of regulated alternating current through current transformers (5). The primary windings (6) of the current transformers (5) are connected in series to the source (1). The gaseous discharge lamps (8) are connected to the secondary windings (7) of the transformers (5).The lighting system is designed for lighting industrial buildings, streets, highways, stadiums, mines, etc.

Abstract: The klystron of the invention comprises cavities 5 with face walls 7 and drift tubes 8. There are annular slots 9in the face walls 7 and drift tubes 8, said annular slots 9 accommodating plates 10 rigidly attached thereto, said plates 10 being made of a nonmagnetic material. The height of the plates 10 is less than half the height of the body 6 of the cavity 5. The length of the plates 10 is equal to the half-difference between the inner diameter of the body 6 and the inner diameter of the drift tube 8. The length of the inner circumference of the body 6 is more than ten times the total thickness of the plates 10.The klystron of the invention can be used in radioelectronic units to provide for higher stability of their output characteristics.

Abstract: A stator of a generator, which stator comprises a housing accommodating a slotted magnetic core 2, a dielectric oil-separating cylinder 4 arranged next to the internal surface of the magnetic core, and a winding composed of two series-connected half-windings 7, 8, each composed, in turn, of high-voltage elements 6. The high-voltage elements 6 of one half-winding 8 in the slotted part of the stator are placed in insulation sleeves 14 which have hollow projections 15 on their internal surfaces. Placed between the hollow projections is a thermosetting compound. The part of each insulation sleeve, which extends beyond the slotted part of the stator, has a cylindrical portion integral with a cone-shaped cable-type termination reinforced with current-carrying layers.

Abstract: A device for exciting a master generator of self-contained power units for transportation facilities comprises a master generator with a first excitation winding, an auxiliary exciter generator with a second excitation winding, an exciting current regulator, and an independent d-c source. One of the leads of the first excitation winding of the master generator is electrically coupled to a respective d-c lead of the auxiliary exciter generator through its second excitation winding connected accordantly in series with the first excitation winding of the master generator.

Abstract: Wire payoff devices are described which are used in conjunction with bobbin supporting cradles typically found in wire stranding and cabling machines such as high speed tubular stranders, bow or skip stranders and planetary stranders. The payoff devices include dancer arrangements each having a pair of pulley wheels mounted on a common support member which is itself mounted for independent movements along two substantially orthogonal directions. One of the pulley wheels is effectively fixed and continuously releases the wire along the axis of the cradle. The other or receiving pulley repeatedly traverses the axial width of the bobbin to follow the take-off points of the wire to provide uniform take-off and prevent scraping or chafing of the wire.

Abstract: A shaft furnace comprises a body (2) made up of superimposed heated sections (3,4,5,6 and 7) each of which is provided with a tubular member (10,11,12,13 and 14) having its walls arranged at an angle of 3 to 4 deg. to the longitudinal axis of the furnace. The tubular members (10,11,12,13 and 14) are partially inserted one into another with a gap (15) formed therebetween; the opening area of the lower portion (16) of each tubular member (10-14) of each section (3-7) is 20 to 25 percent smaller than that of the upper portion (17) of the adjacent underlying tubular member (11) of the furnace section (4).In the area of the gaps (15), the upper portions of the tubular members are formed with pockets (30) which are connected with outlet pipes (20) intended for discharging gaseous and vaporous fumes from the furnace shaft.

Abstract: A method of preparing contacts and electrodes of electric vacuum apparatuses comprising the steps of exposing the contact (electrode) surface to a concentrated thermal flux of 10.sup.4 to 10.sup.6 W/cm.sup.2 in a vacuum or in the environment of an inert gas for 21 to 100 ms and subjecting said surface to subsequent cooling at a cooling rate ranging from 10.sup.4 to 10.sup.6 K/s.

Abstract: A game ball holder for holding a ball, such as a tennis ball, on a garment. The holder includes two elongate strips of elastic material arranged side by side with one lateral edge of one strip adjacent to one lateral edge of the other. The adjacent lateral edges are joined together along a prescribed length from each end and unjoined for a prescribed length midway between the ends. The strips are either attached directly to a garment or attached to a base of cloth material which, in turn, is attached to the garment.

Abstract: A device for attachment of coil ends in a generator stator high-voltage winding includes insulation spacers (13) disposed on external surfaces of the coil end bars (16), auxiliary spacers disposed between coil end bars (16), a case (1), spring stops (15) anchored inside the case (1), and planks (14). The case (1) is made of two coaxial truncated-cone members (2 and 3) and a part of a torus member (4) made integral therewith and incorporating a joint (5) with a seal (6). Each plank (14) is arranged between two insulation spacers (13), and the insulation spacers (13) are arranged between the coil end bars (16) and the spring stops (15). The insulation spacers (13), the planks (14), the spring (15) and a side surface of the case (1) form cooling passages.

Abstract: An electronic ergometer for cardiac arrhythmia patients is disclosed, and it is capable of determining and indicating the magnitude of power developed by an individual. In addition, it can indicate the power at which a cardiac arrhythmia occurs. In one embodiment of the invention, the electronic ergometer is capable of storing the magnitude of power developed by the patient at which the cardiac arrhythmia occurred. The device consists of various electronic components encased in a simple housing attached to the belt, or other clothing, of the patient. It is used by the patient during physical activity, in order to monitor the work and power of the patient. In addition, since an electrocardiogram sensor is provided, the unit sounds an alarm when a cardiac arrhythmia occurs. This advises the patient to cease his working and to rest.