Abstract: Voltage compensating circuits are connected serially to a power system, including capacitors each having different charging voltages (in relationship of approximately 2k-fold (K=0, 1, 2, . . . ) of the smallest charging voltage value). The voltage compensating circuits convert DC voltages in the capacitors into AC voltages and output the AC voltages respectively. The voltages of the capacitors are detected as detected values V1 to V3. The detected values V1 to V3 are used as bit signals for a reference value to check a voltage dip amount of the power system with the reference value and to A/D convert the voltage dip amount into a binary signal. A desired combination is selected from the voltage compensating circuits in accordance with the binary signal so that the total sum of output voltages of the selected voltage compensating circuits compensates the voltage dip of the power system.

Abstract: A switching apparatus includes a pair of fixed coils and a pair of movable coils, with one pair being disposed between the other pair. Two of the coils may be connected back to back on opposite sides of a support plate to increase the stiffness of the coils and reduce damage due to impact between the fixed and movable coils. The coils include two sets of coils, each including one of the fixed coils and one of the movable coils. The coil sets can be driven simultaneously or at different times to perform contact opening and closing operation.

Abstract: A switching apparatus for multiphase electric power includes a plurality of switching units corresponding to different phases. Each switching unit includes an operating mechanism having a movable coil disposed between two fixed coils, and a switch portion having a movable contact operatively connected to the movable coil. A separate power supply may be provided for each switching unit to permit individual control of the different phases.

Abstract: A switching device includes a movable coil which is reinforced by a stiffener to increase the resistance of the movable coil to bending moments. The stiffener may include a nonmagnetic case which surrounds the movable coil. Alternatively or in addition, it may include a resin or other material encapsulating the movable coil.

Abstract: An optical element switching apparatus can switch optical elements, as desired, without interference between the optical element and an object. The optical element switching apparatus comprises a movement member to which a plurality of optical elements are detachably attached and which is supported to be parallel-linearly movable by means of a guide mechanism, a drive mechanism for parallel-linearly moving the movement member, and a guide member for guiding, where the optical elements are to be switched, the optical element to be switched in such a direction as to retreat from the object when the movement member is to be parallel-linearly moved.

Abstract: In a switchgear, by using a spring with a varying spring constant from closing to electrode opening as a loading spring, spring load in the opened electrode state is made smaller than a spring load in the closed electrode state to decrease the energy required from electrode closing up to electrode opening. Moreover, by using a spring in which a load in the opposite direction to a load in the closed electrode state works in the opened electrode state, the opened electrode state can be held securely.

Abstract: An optical microscope has a revolver for selectively inserting a plurality of objective lenses including a low-magnification (very-low-magnification) objective lens on an optical axis for observation light. In fluorescence observation using the low-magnification objective lens, the effective diameter of an observation optical system is set larger than that of an illumination optical system. With this arrangement, fluorescence observation using the low-magnification objective lens can be stably performed. A cube unit having a plurality of cubes corresponding to the respective microscopic methods is arranged in the optical microscope. An auxiliary lens serving as a very-low-magnification objective lens is mounted in this cube unit. The auxiliary lens can be automatically used in observation using the very-low-magnification objective lens. With this arrangement, a compact optical microscope excellent in operability can be realized.

Abstract: An optical microscope has a revolver for selectively inserting a plurality of objective lenses including a low-magnification (very-low-magnification) objective lens on an optical axis for observation light. In fluorescence observation using the low-magnification objective lens, the effective diameter of an observation optical system is set larger than that of an illumination optical system. With this arrangement, fluorescence observation using the low-magnification objective lens can be stably performed. A cube unit having a plurality of cubes corresponding to the respective microscopic methods is arranged in the optical microscope. An auxiliary lens serving as a very-low-magnification objective lens is mounted in this cube unit. The auxiliary lens can be automatically used in observation using the very-low-magnification objective lens. With this arrangement, a compact optical microscope excellent in operability can be realized.

Abstract: A cluster type multi-roll rolling mill with 20 rolls provided in a mono-block housing has 4 backing bearing shafts for supporting rolls on each of two, upper and lower, sides of a travelling path of a rolling material, and is characterized in that the 4 backing bearing shafts on at least one side of said two, upper and lower sides consist of two outside backing bearing shafts and two central backing bearing shafts, the two outside backing bearing shafts each are fixed to the housing through a saddle, the two central backing bearing shafts between the two outside backing bearing shafts are movable in a vertical direction and a drive mechanism is provided for moving vertically the two central backing bearing shafts.

Abstract: A fast changeover from one power system to another in the event of an irregularity in the power source system substantially reduces operating costs by minimizing a power loss in switches during conduction, dispenses with a cooling device for cooling a thyristor switch, and implements the thyristor switch in a compact and low-cost design. The power supply system for a load includes one switching apparatus for connecting a load to one power source system, and another switching apparatus for connecting the load to another power source system. Each of the switching apparatus includes a pair of thyristors connected in anti-parallel and a mechanical switch connected in parallel with the thyristor pair. The thyristor pairs and the mechanical switches are controlled so that the mechanical switches conduct a load current when the load is supplied with power from the one power source system in a steady power supply state.

Abstract: In a switchgear, by using a spring with a varying spring constant from closing to electrode opening as a loading spring, spring load in the opened electrode state is made smaller than a spring load in the closed electrode state to decrease the energy required from electrode closing up to electrode opening. Moreover, by using a spring in which a load in the opposite direction to a load in the closed electrode state works in the opened electrode state, the opened electrode state can be held securely.

Abstract: A switching device has a control section to transfer a gate control signal which switches plural thyristors from an ON state to an OFF state after a parallel switch is open and an opening degree of the parallel switch is met where no arc discharge is generated at a contact point in the parallel switch.

Abstract: An antioxidant composition can be obtained efficiently at high yields by (a) adding ethanol to a hot water fraction of an oyster meat to a final concentration of not less than 40 (w/w) % to obtain a supernatant (step 1), (b) concentrating the obtained supernatant to a solid content of 30-45 (w/w) % (step 2), and (c) adding ethanol thereto to a final concentration of 55-70 (w/w) % to recover precipitates (step 3).

Abstract: A strip rolling mill of cluster type has, on at least one side of the strip path, a work roll, a plurality of intermediate rolls supporting said work roll and a plurality of backing bearing assemblies supporting said intermediate rolls. Each backing bearing assembly has a row of backing bearing units and shape control means by which the backing bearing units are adjustable relative to the work roll axis so that strip shape control can be applied. All backing bearing assemblies on one side of the strip path have such shape control means. In the mill at least two of the shape control means are independently operable so as to apply respectively different shape control patterns to the work roll.

Abstract: In a vacuum interrupter comprising a disc-shaped stationary electrode and a disc-shaped movable electrode arranged in an evacuated envelope in opposed relationship. A main electrode is in electrical contact with a coil electrode having arm parts and coil parts to establish predetermined current flows when the stationary and movable electrodes separate.

Abstract: A vacuum interrupter comprising each electrode assembly of a pair of electrode assemblies having substantially the same structure and arranged in an evacuated envelope in opposed relationship adapted to be connected with or disconnected from each other. Each electrode assembly includes a coil electrode having a plurality of arms extending outwardly from a center ring shaped holding part and a plurality of arc-shaped coil parts formed substantially along the same circumference of the coil electrode and connected to respective ones of the arms, a main electrode including an arc-shaped arm electrically connected to each arc-shaped coil part of the coil electrode, the coil parts being in contact with corresponding ones of the arc-shaped arms along entire surfaces thereof, and a first arm connected to each of the arc-shaped arms of the main electrode and extended substantially toward a center of the main electrode in the radial direction.

Abstract: In a vacuum interrupter comprising a disc-shaped stationary electrode and a disc-shaped movable electrode arranged in an evacuated envelope in opposed relationship, a slot or a salient part is formed on the surface of both the electrodes and thereby a path of an arc current in disconnection operation of both the electrodes is formed along the circumference of the disc-shaped electrode. The shape and position of the slot is selected so that the arc current flows uniformly along the entire circumference of both the electrodes.

Abstract: An electromagnetic rail launcher adapted to accelerate a projectile by an electromagnetic force which comprises:a plurality of rail-like electrodes; andan armature being installed so as to shortcircuit the plurality of rail-like electrodes;at least one of said plurality of electrodes being consisted of a first conductive part which contacts with the armature and a second conductive part which is electrically insulated with the first conductive part;said first conductive part being segmented in a plurality of segmented first conductive parts which are insulated with each other, in an acceleration direction of the projectile;each of said plurality of the segmented first conductive parts having at least one hole through which the first conductive part and the second conductive part are bridged by an arc, when a current flows in the second conductive part.

Abstract: A method for producing an aluminum-stabilized superconducting wire is dislcosed herein, which comprises alternately winding superconducting elementary wires and high purity wires around a core, such as an electrically insulated copper wire core, impregnating the entire wire arrangement with solder to bind the wires together and subsequently forming or drawing the wire arrangement to increase the adhesion between the wires. In another embodiment, the thus-impregnated wire arrangement is subjected to a heat treatment to recover the residual resistance ratio of the aluminum. The impregnated wire arrangement is characterized by having a high mechanical toughness and improved electrical contact for greater electrical stability.

Abstract: A forced-cooled superconductor wherein a plurality of superconducting wires are placed within a hollow stabilizer of substantially rectangular section; and a first passage for passing a coolant is longitudinally formed between the stabilizer and a casing encasing the stabilizer, the stabilizer having a plurality of second passages formed therethrough for flowing the coolant from the first passage to the inside of the stabilizer so that the coolant flows through the second passages into the space defined between the superconducting wires for direct cooling. The stabilizer includes a pair of channel members opposedly fitted together to form into a substantially rectangular tube.