摘要:
Provided are an underwater processing apparatus which can effectively prevent water from entering a shield for a workpiece having a surface ruggedness, and in which variation in a gas flow for a processing part is reduced, a processing method and an application thereof to a nuclear reactor, and the under water processing device is composed of a shield means which locally cover the processing part with the gas in order to prevent water from entering the shield member, the shield means having a solid wall formed of a member which is slidable in a part where it make contact with the workpiece, and adapted to make contact with the workpiece and to be moved up and down by a pressing force, and a water jetting means for forming a water curtain around the outer periphery of the solid wall.
摘要:
A wear resistant material containing no cobalt is used for a sliding portion of a control rod driving mechanism of a nuclear plant for reducing the exposure dose due to elution of cobalt and ensuring smooth driving of a control rod under a high load for a long time. A control rod driving mechanism employs a roller and a pin, each of which is made of a wear resisting alloy comprising coarse particles of a hard phase, having a particle size of from 20 to 100 .mu.m, and dispersed in a soft matrix made of an iron-based or nickel-based alloy containing chromium and having a hardness of 300 Hv or less. A nuclear reactor employs this control rod driving mechanism.
摘要:
The nuclear fusion reactor of the present invention presents a new vacuum vessel for enclosing plasma particles where a reactor wall exposed to the above plasma particles has a piled structure. A plurality of heat-resisting ceramic tiles are metallurgically bonded to a metal-base body having a cooling means through a brazing material. The ceramic tiles are preferably composed of sintered silicon carbide of high density and containing a little beryllium oxide between the boundaries of crystal grains.
摘要:
A carbon film is formed on a ceramic element, or a metal film is formed on the carbon film, and subsequently the ceramic element is bonded to another ceramic or metal element, thereby forming a composite article. The composite article has a high bonding strength and is hardly fractured at joint. Ceramic articles having a surface coating of a hard carbon film or a hard carbon film containing metal grains can also be formed by this process.
摘要:
In a joining method for manufacturing a rotor blade by joining a plurality of members, the members are pressed so as to exert a predetermined pressure on the bonding interface. A pulse voltage is applied to the members to pass electric current therethrough, and the joint portion is heated by resistance heating generated at the bonding interface and in the bulk of the members to cause diffusion bonding and thereby to join the members to each other. With this method, good joining can be achieved without substantially changing the crystal structure and mechanical properties of the base metals.
摘要:
In a Y bar for forming coupling elements, an opening angle of a pair of right and left leg parts is narrower than that of the ordinary ones. Plural bent portions, which are bent inward, are formed successively in an extending direction of the leg parts in a range from a crotch part toward pawl parts at front ends of the leg parts. The gap between the pawl parts are narrowed gradually from proximal ends to front ends thereof. Bulging portions are provided on outer side surfaces of the crotch part. Thus, the stabilization of the posture of a metallic coupling element, which is obtained by cutting the Y bar, at the time of mounting, strength of the coupling element and stabilization of the mounting posture of the coupling element to the fastener tape can be improved.
摘要:
In order to provide a containment boom capable of functioning as a barrier for certainly preventing the containment of oil spill in no concern to momentary violent movements of waves and currents, the containment boom comprises a plurality of float units and a coupling portion by which adjacent float units are coupled to one another. Each of the float units comprises a housing having an oil shielding surface perpendicular to sea level, a float portion having a buoyant force, and a plummet portion positioned under the float portion. In addition, the float portion and the plummet portion are adjusted so as to locate a water line to approximate middle position of vertical length of the oil shielding surface. Furthermore, the coupling portion is a flexible coupling portion for varying a relative position between the adjacent float units.
摘要:
An environmental improvement device for a storage body and more particularly to a simplified, but highly effective device of that type wherein the stored articles are protected by a circulating flow of purified air that also prevents the entry of foreign objects into the storage area.
摘要:
An evaporator and heater core are provided within a cooling unit so that the flow rate of the heating medium flowing into the heater core can be adjusted with a 3-way valve. The target outlet temperature of the air discharged into the space being temperature controlled is calculated based upon the temperature of the air taken into the cooling unit and the temperature setting that is set at the temperature setting device. The openness of the 3-way valve is adjusted in such a manner that the temperature of the air outlet from the cooling unit is adjusted toward the target outlet temperature when the intake air temperature has entered a specific temperature setting range. Also, for each storage compartment, unit fans, an evaporator and a heater core are provided, housed within a unit case. The evaporators are connected in parallel to a common compressor to adjust the flow rates of the coolant with a solenoid valve. The heater cores are connected in series so that they share a common heat source and a bypass passage is provided that bypasses the heater cores to adjust the flow-rate ratios between the individual heater cores and the bypass passage with a 3-way valve.
摘要:
A semiconductor device and the method of fabricating the semiconductor device include a semiconductor substrate and a plurality of conductor films formed on the substrate. Each of the conductor films is made of aluminum alloy including at least one element selected from palladium and platinum and, more preferably, further including at least one element selected from lithium, beryllium, magnesium, manganese, iron, cobalt, nickel, copper, lanthanum, cerium, chromium hafnium, zirconium, cadmium, titanium, tungsten, vanadium, tantalum, and niobium, with a protective film which includes oxide of the selected one of palladium and platinum being formed on the side wall of the conductor film.