65results about How to "Avoid local concentration" patented technology

Heat conductive fins are welded along both sides of a belt-like member with a margin left along edges of the both sides, thereby to form a unit. The unit is welded to a body with the heat conductive fins from the outside of each fin. Next, another belt-like member is covered over a gap between adjacent belt-like members, and these members are welded from the outside. With this arrangement, there is no need to weld in a narrow and long space and the entire welding step is carried out from the outside, which makes it easier to assemble a cask.

A speaker's surround to be attached to an edge of a diaphragm in a speaker system is provided, which is capable of keeping its predetermined shape while repeating elastic deformation for accommodating large amplitude vibration of the diaphragm. Further, the surround is highly durable to withstand the repeated large amplitude vibration, and which can achieve high sound pressure levels. The surround for a speaker system includes a surround piece made of a rubber mold and a base member embedded in the surround piece. The base member is obtained by soaking a cloth material made of cotton or aramid fiber with a thermosetting resin such as phenol resin, and press-formed with heat into a predetermined shape. The surround thus has enhanced its shape maintaining capability.

A semiconductor device is provided which is capable of improving its reliability by using a material having a high relative dielectric constant as a material for its gate insulating film, by suppressing degradation of an EOT (Equivalent oxide Thickness) and by preventing crystallization of the material having a high relative dielectric constant. The semiconductor device (Field Effect Transistor) has a silicon substrate, a seed layer made up of silicon oxide, a gate insulating film made of amorphous hafnium aliminate and a gate electrode made up of polycrystalline silicon formed the gate insulating film. The gate insulating film is so formed that a hafnium concentration decreases monotonously or step by step, whereas an aluminum concentration increases monotonously or step by step along a direction of a thickness of the gate insulating film from the silicon substrate side toward the gate electrode. In a boundary region between a lower layer side region and an upper layer side region in the gate insulating film, the hafnium and aluminum concentrations change continuously.

To provide a drum holding structure that does not impair the resonance feature or the sound quality that the drum originally possesses, that is free of occurrence of strains or twists in the drum constituents despite a long term of use, and that is excellent in terms of workability, and a drum held by the holding structure.

A holding structure for fixing a drum 1 to a drum holding rod 9, in which an elongated plate-like holder member 3 extending circumferentially is held by, out of a plurality of bottom-side lugs 2 and 2A arranged on the bottom side of the drum 1, at least two successive prescribed bottom-side lugs 2A arranged circumferentially. The holder member 3 is provided with a bracket member 4 for the drum holding rod 9 to thereby hold the drum 1.

The maximum value of peak intensities of cathode luminescence of a wavelength corresponding to a band gap of gallium nitride and in a measured visual field of 0.1 mm×0.1 mm is 140 percent or higher of an average value of the peak intensities of the cathode luminescence, provided that the peak intensities of the cathode luminescence are measured on a surface of the gallium nitride substrate.

There is provided a light emitting device and electric equipment, which are bright and have low consumption power and are low in costs. When an organic EL material is made present in a metal oxide porous body including a heavy atom, phosphorescence light emitting of the organic EL material in which only fluorescence is generally observed can be promoted. Thus, an organic EL element in which phosphorescence light emitting is produced is obtained. With respect to this element, since phosphorescence can be used, light emitting efficiency is high. Also, since a conventional organic EL material can be used, it can be manufactured with a low cost. A light emitting device and electric equipment are manufactured using this organic EL element.

A steering support member according to the present invention supports a steering shaft, extends in a vehicle width direction and is fixed at both ends to lateral sides of a vehicle, is molded of a light alloy or a resin composite material. And the steering support member includes a fixing portion having a shape of a truncated cone that extends toward a vehicle front side from the vicinity of a position supporting the steering shaft, a top of the fixing portion being fixed to a dash panel delimiting an engine room in a vehicle front portion, and a plurality of reinforcing ribs that are arranged upright along tangents to a circle constituted by the top of the fixing portion and to a bottom circle.

The invention discloses an anchor rod system used for gas extraction and hydraulic fracturing and an extraction method. The anchor rod system comprises a hollow anchor rod, a retaining ring, a closed locking device, a gas extraction pressure pipe, a hydraulic fracturing system, a gas extraction system and the like. The hollow anchor rod comprises an anchoring section and a tensioning section. The anchoring section is a solid body, the retaining ring is arranged outside the anchor section, the diameter of the retaining ring is smaller than that of a drilled hole of the anchor rod, and the retaining ring serves as a connector of the anchoring section solid body and the hollow gas extraction part of the tensioning section. The tensioning section is connected with the closed locking device through an outer thread. The gas extraction pressure pipe is connected in the hollow anchor rod, the diameter of the gas extraction pressure pipe is slightly smaller than that of the hollow anchor rod, and threads are arranged on the upper end and the lower end of the gas extraction pressure pipe to be connected with the hollow anchor rod in a threaded mode. A gas content monitoring instrument is arranged on the lower section of the gas extraction pressure pipe. The gas extraction pressure pipe is connected with a gas extraction pipe of the gas extraction system through a system connecting thread. Gas can be efficiently extracted in an extraction roadway, the hole sealing rate is high, gas extraction intelligence is achieved, and the dangers such as local concentrated gas burst can be effectively pre-warned and predicted.

An object is to improve the efficiency of a compressor by preventing localized concentration of a boundary layer occurring on the surface of a hub, and by inducing a reduction in the thickness of the boundary layer. There is a compressor impeller having a plurality of blades, and a hub disposed at the root of this plurality of blades, and in which at least part of the surface of the hub on which a fluid flows is inclined in relation to an axis of rotation, wherein a boundary layer reduction part which induces a reduction in the thickness of a boundary layer occurring due to a flow of fluid is provided on the surface of the hub.

The invention belongs to the technical field of poultry breeding and particularly relates to a disinfection and sterilization device for poultry breeding. The disinfection and sterilization device forpoultry breeding comprises a base, wherein rollers are fixedly installed at the bottom of the base, a supporting frame is fixedly connected to the top of the base, a liquid storage tank is fixedly installed at the top of the supporting frame, a clamping cover is movably connected to the top of the liquid storage tank through sleeving, a liquid outlet funnel is fixedly installed at the bottom of the liquid storage tank, a liquid outlet pipe is fixedly sleeved and connected in the liquid outlet funnel, a valve is fixedly installed outside the liquid outlet pipe, and one end of the liquid outletpipe is fixedly connected with a transporting pump. By arranging an adjusting rod, an adjusting plate, an adjusting spring, a movable buckle, a fixing bolt and a fixing groove, the height of a spraying device can be adjusted according to the area of a breeding house in the disinfection and sterilization process of poultry breeding, accordingly the spraying range of a disinfectant can be effectively controlled, the disinfection and sterilization speed of the breeding house is improved, and the working efficiency of the disinfection and sterilization device is improved.

The invention provides a high-frequency elliptical vibration cutting system and method, and belongs to the field of ultraprecision machining. The high-frequency elliptical vibration cutting system comprises an ultrasonic power source, power amplifiers and an elliptical vibrator which are connected in sequence. The ultrasonic power source is used for generating two paths of high-frequency sine alternating-current electric signals with adjustable amplitudes and frequencies. The power amplifiers are used for receiving the two paths of high-frequency sine alternating-current electric signals, performing gain amplification on the power of the two paths of high-frequency sine alternating-current electric signals, and outputting a bending vibration excitation electric signal and a longitudinal vibration excitation electric signal respectively. The elliptical vibrator is used for converting the received bending vibration excitation electric signal and the received longitudinal vibration excitation electric signal into a bending vibration signal and a longitudinal vibration signal, and realizing high-frequency elliptical vibration under complex vibration of the bending vibration signal and the longitudinal vibration signal. A second-order longitudinal vibration mode and a fourth-order bending vibration mode are consistent in resonant frequency and have two overlapped standing wave nodes, and the standing wave nodes are used as mounting supporting points. The stability of high-frequency elliptical vibration of the elliptical vibrator is improved.

The invention discloses an engineering packing box bottom board set assembling and welding method. The engineering packing box bottom board set assembling and welding method comprises the first step of combination of a frame, the second step of installation of longitudinal beams, the third step of arrangement of reinforcing bars, the fourth step of arrangement of a bottom board, and the fifth step of installation of accessories. The conventional assembly sequence of a packing box bottom board set is changed, and therefore the purposes of creating the space, improving the welding operation environment and then improving the welding quality are achieved. The more effective welding process method is provided, the welding intensity is further ensured, partial concentration of welding thermal stress is effectively prevented, welding deformation is reduced, and the deformation resistance of the whole is improved.

The invention relates to an extinguishing gas filtering device and an electric current switchgear comprising such a filtering device. The extinguishing gas filtering device for the electric current switchgear with separable contacts, including an electric arc extinguishing chamber, includes, assembled together an inlet part 52 for the extinguishing gases, made of a metal material and including aninlet aperture 60 intended to be fluidically connected with an extinguishing gas outlet of the switchgear; an outlet aperture 66; a flared wall 62, 64, 72 extending between the inlet and outlet apertures; a gas diffuser 54, which covers the outlet aperture, being planar in shape and including through-apertures; and a filter 56 made of porous metal foam, placed at the output of the gas diffuser.

A plasma jet spark plug for igniting an air-fuel mixture in a conventional combustion device such as an internal combustion engine.

A ceramic heater includes a ceramic plate having a wafer placement surface on which a wafer is to be placed, and incorporating a resistance heating element therein, and a ceramic tubular shaft having one end joined to a rear surface of the plate. The tubular shaft has a vertical sectional shape including an S-like portion or a curved portion having an inflection point in at least one position, and includes a through-hole penetrating the tubular shaft from the one end to the other end with an axis extending along the vertical sectional shape of the tubular shaft.