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358results about How to "Reduce spread" patented technology

Nitride LED (light-emitting diode) structure and nitride LED structure preparing method

The invention discloses a nitride LED (light-emitting diode) structure. A P-type doped InGaN/GaN superlattice structure is inserted between a multiple quantum well active layer and an electronic barrier layer so as to improve the hole concentration and reduce the dosage concentration of the P-type hole injection layer; the superlattice structure has polarization effect, thus being capable of improving the doping efficiency and reducing the P-type impurity concentration; and impurity atoms are prevented from being diffused to the potential well, and the inner quantum efficiency and the luminous efficiency of the device can be improved. The invention also discloses a preparation method of the nitride LED structure, through inserting the P-type doped InGaN/GaN superlattice structure between the multiple quantum well active layer and the electronic barrier layer, the hole concentration can be improved, and the dosage concentration of the P-type hole injection layer can be reduced; since the superlattice structure has polarization effect, the doping efficiency can be improved and the P-type impurity concentration can be reduced; and the impurity atoms are prevented from being diffused to the potential well, and the inner quantum efficiency and the luminous efficiency of the device can be improved.
Owner:ENRAYTEK OPTOELECTRONICS

Instant execution method of block chain based on homomorphic encryption

The invention discloses an instant execution method of a block chain based on homomorphic encryption. The instant execution method includes the steps: encrypting data needing to be shared by using ahomomorphic encryption algorithm; outputting the encrypted data; jointly generate cooperation parameters by multiple participants; and verifying that the input and output of the encrypted ciphertext amount in the transaction are equal, and executing a response or write operation on accounts of a transaction initiator and a transaction receiver with readable or writable authority, wherein incentivepayment is used for encouraging a resource provider to share redundant memory and bandwidth resources as cache nodes of a transaction flow. According to the instant execution method of a block chainbased on homomorphic encryption, the block chain is used to carry out hierarchical linking on each service node, so as to ensure that the data exchange record is real and reliable and cannot be tampered, and meanwhile, for the data distribution problem, in combination with a blockchain cross-chain and instant execution contract technology, the blockchain-based data distribution system is provided,thus changing the traditional data distribution mode, and promoting the system maintenance on the system safety, stability and other performances through an incentive payment excitation measure.
Owner:山东公链信息科技有限公司

Systematic temperature compensation method for laser inertial measurement unit based on spline interpolation iterative correction

InactiveCN108645427AAvoid the problem of poor matching effectAvoid complicated calibrationMeasurement devicesAccelerometerCompensation methods
A systematic temperature compensation method for a laser inertial measurement unit based on spline interpolation iterative correction, provided by the invention, comprises the following steps: (1) obtaining gyro and accelerometer zero offset and scale factors corresponding to different temperature points in a preset temperature range; (2) establishing the initial temperature model of the gyro andaccelerometer zero offset and scale factors by using a cubic spline interpolation technology; (3) offline compensating obtained gyro and accelerometer pulse output values; (4) calculating the zero offset and scale factors corresponding to all the temperature points after the compensation according to the compensated gyro and accelerometer pulse output values; (5) establishing the secondary temperature model of the gyro and accelerometer zero offset and scale factors; (6) normalizing the initial temperature model and the secondary temperature model to obtain a gyro and accelerometer zero offsetand scale factor optimized temperature model; and (7) offline compensating and outputting the actually measured pulse output values of the gyro and the accelerometer by using the optimized temperature model. The method improves the systematic precision of the laser inertial measurement unit.
Owner:BEIJING AEROSPACE ERA LASER NAVIGATION TECH CO LTD

Production technology for polycrystalline silicon

The invention discloses a production technology for polycrystalline silicon. The production technology includes the following steps: 1, a first coating, a second coating and a third coating are sequentially arranged on the surface of a crucible from inside to outside, and a crystalline silicone leftover material layer is laid; 2, a small quantity of raw polycrystalline silicon materials in the melted state is contained in the crucible, and the temperature of the crucible is controlled to be lower than the melting point of the crystalline silicone leftover material layer to enable the small quantity of melted raw polycrystalline silicon materials to form a crystallization protection layer; 3, in the vacuum environment, to-be-processed raw polycrystalline silicon materials are contained in the crucible, placed in a melting furnace with an electron beam generating device and processed through laser irradiation; 4, high-frequency induction heating is carried out in the vacuum environment, a slag forming constituent is added, plasma heating is carried out, steam-and-hydrogen-mixed argon is introduced, and directional solidification is carried out to obtain the polycrystalline silicon serving as the target product. By means of the production technology, the boron content, the phosphorous content and the metal impurity content can be effectively reduced, the complete polycrystalline silicon is prepared, long crystal dislocation is less, grain boundaries are proper, and the conversion rate of a polycrystalline silicon battery is increased.
Owner:THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG

Method for molding vertical wall of deep foundation pit

InactiveCN101806066AConstruction independenceLow economic indicatorsBlastingExcavationsDetonatorSurface layer
The invention discloses a method for molding a vertical wall of a deep foundation pit. The method comprises the following steps: drilling a plurality of presplit holes on a preset edge of the foundation pit and filling each presplit hole with a stick dynamite and a detonating fuse connected with an instant electric detonator outside the hole by adopting full-pit-depth one-step drilling molding; forming a buffer hole, a main explosion hole and a cutting hole in turn from outside to inside on the surface layer of the foundation pit; arranging segmented stick dynamites and non-electric millisecond difference detonators in the buffer hole, the main explosion hole and the cutting hole, wherein the non-electric millisecond difference detonators are connected with the instant electric detonators; after all the instant electric detonators are connected with each other in series, connecting all the instant electric detonators to a trigger; igniting a plurality of rows of blast holes at the same time and detonating the presplit hole, the cutting hole, the main explosion hole and the buffer hole in turn; after blasting, performing digging and transportation and wall surface timbering in sequence; blasting step by step to the bottom of a preset foundation pit; and manually repairing and scattering the bottom of the foundation pit. The method has the advantages of little construction difficulty, high protection safety, short construction period, stable engineering project quality and excellent comprehensive benefit.
Owner:CHONGQING IRON & STEEL (GRP) CO LTD

Fireproof explosion-proof high-low voltage switch cabinet

The invention discloses a fireproof explosion-proof high-low voltage switch cabinet, which relates to the technical field of switch cabinets. The fireproof explosion-proof high-low voltage switch cabinet comprises a cabinet body, a cabinet door and an explosion-proof device, wherein the cabinet door used for displaying the temperature of each cavity of the switch cabinet is hinged to the front face of the cabinet body; the explosion-proof device used for ventilation and air diffusion is fixedly installed in the cabinet body; and an air inlet fan, a dust exhaust hole and a filter plate are arranged in the cabinet body. A controller, the air inlet fan and an exhaust fan are arranged, external air is extracted by the air inlet fan and is sequentially filtered by a first filter hole and a second filter hole to effectively filter impurities, and the problem that impurities easily enter the switch cabinet to block electrical equipment due to a conventional heat dissipation mode is solved. The device is good in filter effect, prevents impurities from blocking electrical equipment and reduces the heat dissipation effect, prolongs the service life of the electrical equipment, reduces the probability of open fire of the electrical equipment caused by overheating, and prolongs the service life of the device.
Owner:安徽卓越电力设备有限公司

Water-spraying fireproof door capable of delaying fire

The invention provides a water spraying fireproof door capable of delaying fire, including a frame, a rectangular bucket, bakelite plates, an evaporation cavity, an evaporation liquid, a water pipe, water, an evaporation box, an air pipe, a balancing weight, a rubber sheet, a clamping block, a gasket, a sheet, an air outlet, a nozzle and a protrusion; the rectangular bucket is seamlessly welded atthe bottom of the inner wall of the frame; two bakelite plates are adhered to the inner wall of the rectangular bucket through structural adhesives; and the evaporation cavity is formed in the rectangular bucket, the evaporation box is embedded and welded to one side of the frame, the air pipe is seamlessly embedded into the top of the evaporation box, the evaporation cavity and the evaporation box are filled with evaporation liquid with uncertain shapes, the water pipe is embedded into the frame, the rectangular bucket is filled with water with uncertain shapes, and the balancing weight is arranged between the bakelite plates in a seamless sliding mode. The water 7 in the rectangular bucket 2 can be rapidly sprayed out of the frame 1 through the water pipe 6 and the nozzle 16 when the frame 1 encounters a fire, so that the fire spreading function is greatly slowed down, and precious time is gained for people to escape.
Owner:浙江哈勃实业有限公司 +1

High temperature oxidation-resistant thermal barrier coating layer with composite structure and preparation method thereof

The invention provides a high temperature oxidation-resistant thermal barrier coating layer with a composite structure. The high temperature oxidation-resistant thermal barrier coating layer comprises a metal bonding layer, a first ceramic layer, a second ceramic layer, a metal deposition layer, a third ceramic layer and a fourth ceramic layer deposited at the top of a high-temperature alloy basal body in sequence; the first ceramic layer and the third ceramic layer are both isometric crystal structures; the second ceramic layer and the fourth ceramic layer are both columnar crystal structures; components of the ceramic layers are ZrO2 with stable Y2O3; components of the metal bonding layer are MCrAlY; and components of the metal deposition layer are MCrAlY or NiAl, wherein M is Ni or/and Co. The invention further provides a method for preparing the high temperature oxidation-resistant thermal barrier coating layer. The high temperature oxidation-resistant thermal barrier coating layer has multiple layers of laminated isometric crystal and columnar crystal structures, and is excellent in oxygen resistance and thermal shock resistance; and the preparation method is simple in process, excellent in repeatability and easy to operate.
Owner:NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH

High-efficiency welding method of stainless steel composite board

InactiveCN103862183AWeld depth is smallIncrease weld widthArc welding apparatusMetal working apparatusElectricitySlag
The invention relates to the field of composite board welding methods, in particular to a high-efficiency welding method of a stainless steel composite board. The high-efficiency welding method of the stainless steel composite board comprises the following steps: processing grooves; cleaning and pairing the grooves; welding a base layer on the side of a composite layer; welding the composite layer; welding a base layer on a back surface. The high-efficiency welding method of the stainless steel composite board has the beneficial effects that since electroslag welding with wire electrodes is adopted for welding the composite layer and electrode wires with content of Cr and Ni which is close to the content of Cr and Ni of composite materials, low-carbon weld metal with excellent corrosion resistance is guaranteed to be obtained; since the electroslag welding with wire electrodes has the characteristics of small weld depth and large weld width, welding passes can be effectively reduced, the reduction of the welding passes means the simplification of the welding process, the welding efficiency is improved and the probability of occurrence of defects such as incomplete fusion and slag inclusion is also greatly reduced; since the base layer of the back surface is welded by adopting 450A-500A large-current submerged-arc welding, the weld penetration of base metal can be effectively guaranteed, the defect of incomplete fusion is precluded from occurring and the welding efficiency can be greatly improved.
Owner:JIGANG GRP
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