Abstract: A powder coating is provided, comprising a particulate material having a particle distribution satisfying the following requirements:(a) the volume 50% diameter is from 7 .mu.m to 20 .mu.m;(b) the proportion by volume of particles having a particle diameter of not less than 30 .mu.m is not more than 20%; and(c) the proportion by population of particles having a particle diameter of not more than 5 .mu.m in the particulate material is not more than 65%, the particulate material also has an external additive attached to the surface thereof, the percent coverage by the external additive (determined by an equation described in the specification) being from 30 to 200%. The powder coating can provide a film having a reduced thickness with an improved leveling, thus improving working efficiency. In addition, the fractions of the powder coating from the coating process can be recycled and re-used, thereby reducing the total cost.

Abstract: A current detector (130) is connected between the negative output terminal (-) of a high voltage DC power source (9) and the ground; the current detector (130) comprises a core (12) which is electrostatically shielded by a grounded conductive cover (15), a coil (11) wound around the core (12) and connected in series between the negative output terminal (-) and an electrode (4b) of a gas laser (1), and a Hall device (13) which is magnetically coupled to the core (12) and sends its output signal to a control signal input terminal (91) of the high voltage DC power source (9) so as to control high voltage output power of the latter.

Abstract: A powder coating is provided, comprising a particulate material having a particle diameter satisfying the following requirements:(a) the volume 50% diameter be from 7 to 15 .mu.m;(b) the proportion by volume of the particles having a particle diameter of not less than 20 .mu.m and those having a particle diameter of not less than 30 .mu.m in the particulate material be not more than 10% and 0%, respectively; and(c) the proportion by population of the particles having a particle diameter of not more than 5 .mu.m in the particulate material be not more than 50%, the particulate material having an external additive attached to the surface thereof, the percent coverage by the external additive determined by the following equation described in the specification being from 30 to 100%.

Abstract: In a high velocity gas laser oscillator of radio frequency or microwave exciting type, both end parts of the discharge tube are provided with gas flow rectifiers for making an inward flowing whirlwind at the discharge region of the discharge tube by blowing the discharge gas through plural slits located in a plane disposed at a predetermined angle with respect to a plane including axis of the discharge tube, wherein microwave power is applied to the discharge tube so as to define an annular discharge region in the discharge tube.

Abstract: An axial flow type laser oscillator has a laser resonator having a first gas discharge tube (5a) and a second gas discharge tube (5b) connected coaxially, serially and linearly connected (5a, 5b) to form an integral gas discharge tube (5a+5b) and a resonator base (9) containing a gas distribution paths therein for distributing the laser medium gas to both ends of the integral gas discharge tube (5a, 5b) and disposed in substantial parallelism along the laser resonator and holds both ends of said integral gas discharge tube; the resonator base is held at one end by a pin-bearing and the other end by a roller bearing, so that no stress is given to the integral gas discharge tube (5a+5b) even at temperature rise of the laser medium gas.

Abstract: In the laser beam machining apparatus, an optical sensor provided with a blue filter detects change of color of light emission from the machining spot on a workpiece irradiated by a machining laser beam from orange color light emission to blue color light emission, when laser beam intensity per area becomes above a certain level as a result of good focusing by a condenser lens; and the position of the condenser lens is controlled based on output of the optical sensor, in a manner that the optical lens lies in such a positional range that the blue color is emitted from machining spot.

Abstract: A semiconductor memory includes a random access memory (RAM) and a serial access memory (SAM). The RAM includes a memory cell array including memory cells.

Abstract: A semiconductor memory device includes: a first memory cell array having a plurality of memory cells arrayed in a row direction and a column direction; a second memory cell array having at least serial access memory cells corresponding to a single row of the first memory cell array; a first data bus; a second data bus; a third data bus; and a bus switching control circuit for controlling a connection of each of the serial access memory cells to one of the first, second and third data buses and selecting one of the buses to connect the selected data bus to the external of the device. The bus switching control circuit outputs each of bit data in the serial access memory cells serially and alternately to the first and second data buses and, where a plurality of transfer data blocks are serially read out from the second memory cell array, outputs a bit data in the serial access memory cell corresponding to the head or last address in each of the transfer data blocks to the third data bus.

Abstract: A hydraulic operating apparatus for a circuit interrupter comprises a conversion unit for converting input information from the exterior concerning a speed control pattern into an electrical signal for driving a linear or servo motor according to the closing and interrupting commands, the motor drive signal provided from the converting means being transmitted to the motor such that the displacement of the motor causes the hydraulic control valve apparatus to be operated to switch the fluid passages to selectively drive the hydraulic cylinder in different directions, and that the position during the switching of the hydraulic control valve driven by the motor is made different from the final stop position at its interruption or closed state to provide a throttle effect of a throttle in the hydraulic control valve thereby controlling the speed of the hydraulic cylinder.

Abstract: A hydraulic operating apparatus in which a differential piston is used as a drive unit, and in which the differential piston is driven by applying a high pressure fluid on a large piston face side through a hydraulic pressure control device for controlling the hydraulic pressure, and a high pressure fluid always being applied on the small piston face side. The hydraulic operating apparatus is constructed such that a high pressure fluid is applied concurrently on both piston faces when the differential piston stops at its receded position, and a thrust generated due to the difference between the forces applied on the both piston faces is held in check by a holding device acting on the differential piston or its extension. The differential piston is moved forward upon the removal of the holding force of the holding device, and the piston is moved backward upon the removal of the high pressure fluid on the large piston face side.

Abstract: A tank-type switchgear comprises a main contact disposed in a hollow tank and having movable and stationary contact elements, an auxiliary contact disposed in the tank and electrically connected parallel with the main contact and having movable and stationary contact elements, a main lever rotatably connected to the movable contact element of the main contact, an auxiliary lever rotatably connected at one end thereof to the movable contact element of the auxiliary contact, a connecting link for rotatably supporting the other end of the auxiliary lever, a device for rotatably supporting the main lever and the connecting link with respect to the tank, and a driving device for rotating the main lever. The auxiliary lever is rotatably connected to the main lever such that the auxiliary lever rotates in the direction opposite the rotational direction of the main lever.