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64results about How to "Improve contact quality" patented technology

Field effect gas sensor taking air gap as insulation layer and preparation method thereof

The invention discloses a field effect transistor gas sensor taking an air gap as an insulation layer and a preparation method. The preparation method mainly comprises the following steps of: spin-coating an organic insulation layer on an electric conducting substrate to serve as a device supporting layer, and etching a part of the device supporting layer to prepare an air gap groove; placing a micro-nano crystal above the air gap; and preparing source and drain electrodes of the device by utilizing a gold plate pasting electrode method or a photoetching technology, wherein the air gap between the micro-nano crystal and a grid electrode at the bottom of the groove is taken as a grid electrode insulation layer of the device. According to the field effect transistor gas sensor taking the air gap as the insulation layer and the preparation method, disclosed by the invention, the pollution and the damage to the surface of the nano-crystal due to the contact of the insulation layer in a preparation process is avoided; the point discharge effect is avoided favorably, and the stability of the sensor is increased; the success rate for preparing the device is greatly increased, and the device performance is improved; and an electric conducting channel is directly exposed in gas to be tested, and thus the field effect transistor gas sensor has a better air-sensitive performance. The field effect transistor gas sensor disclosed by the invention has the advantages of good stability, high sensitivity, detection limit reaching ppb (parts per billion) order and high response speed and recovery speed.
Owner:NORTHEAST NORMAL UNIVERSITY

Precise roll forming method for bimetallic rings

ActiveCN103042142ASignificant energy saving and material savingReduce manufacturing costMetal rollingProduction rateRoll forming
The invention relates to a precise roll forming method for bimetallic rings. The method comprises: S1, obtaining an outer ring blank and an inner ring blank; S2, assembling the outer ring blank and the inner ring blank; S3, placing a core roller in the inner ring blank; S4, placing a drive roller outside the outer ring blank; S5, driving the drive roller to rotate through a drive device and driving the core roller to perform linear feed movement radially, wherein the outer ring blank and the inner ring blank are attached closely constantly to produce continuous local plastic deformation with the wall thickness reducing and the diameter expanding; and S6, stopping feed of the core roller and getting the core roller back when the outer diameter of the outer ring blank reaches a preset value of the outer diameter of a bimetallic ring. According to the precise roll forming method, the bimetallic ring is formed integrally through one step through continuous local plastic deformation, so that the method has the advantage that energy and materials are saved, the production cost is reduced, and the yield is improved. The bimetallic ring interface contact quality is good, the connection strength is high, and requirements of service performances and service lives of high-performance bimetallic rings can be met.
Owner:WUHAN UNIV OF TECH

Precise roll forming method of bimetal tubular part

The invention relates to a precise roll forming method of a bimetal tubular part. The precise roll forming method of the bimetal tubular part comprises a first step of obtaining an outer ring part blank and an inner ring part blank, a second step of assembling the outer ring part blank and the inner ring part blank, a third step of placing a core roller in the inner ring part blank, a fourth step of placing a drive roller outside the outer ring part blank, a sixth step of driving the drive roller to rotate through a drive device, wherein the core roller is driven to conduct linear feed movement along the radial direction, the outer ring part blank and the inner ring part blank are closely attached to each other all the time, continuous partial plastic deformation with small wall thickness, expanded inner and outer diameter and axial tension is generated, and a sixth step of stopping the core roller from feeding and enabling the core roller to return. By means of the continuous partial plastic deformation, the bimetal tubular part is formed integrally at a time. The geometric dimensioning of the bimetal tubular part is easy to control. Therefore, the precise roll forming method of the bimetal tubular part has the obvious advantages of saving energy and materials, reducing production cost, and improving the production efficiency. The bimetal tubular part is good in interface contact quality, high in connection intensity, and capable of meeting requirements of the service performance and the service life of the bimetal tubular part.
Owner:WUHAN UNIV OF TECH

Bistable state magnetic latching contactor for power supply switch of electric tricycle

The invention relates to an electromagnetic switch, in particular to a bistable state magnetic latching contactor for a power supply switch of an electric tricycle. The bistable state magnetic latching contactor comprises a cover assembly, wherein the lower part of the cover assembly is connected with a casing; a static iron core is fixed on the upper part inside the casing; the lower part of thestatic iron core is connected with a movable iron core assembly; the upper part of the static iron core is connected with a movable contact assembly; a copper bush is arranged outside the static ironcore; a coil assembly is arranged between the outside of the copper bush and the casing; an upper spring is arranged between the static iron core and the movable contact assembly; and a lower spring is arranged between the static iron core and the movable iron core assembly. Compared with the prior art, the bistable state magnetic latching contactor for the power supply switch of the electric tricycle aims to eliminate the electric energy consumption and improve the performance of products and eliminates the defects that the traditional electromagnetic switch loses electric energy when being connected because a coil is always in the electrified state and the coil is easy to burn down due to long-term energization and heating.
Owner:宁波松乐电器有限公司

Method for measuring p-layer carrier concentration of pin-type GaN avalanche device

The invention discloses a method for measuring the p-layer carrier concentration of a GaN avalanche detector, which comprises the steps of growing an i-layer gallium nitride and an n-layer gallium nitride in a distributed manner under the same condition, performing ohmic contact by using a metal electrode, and testing the carrier concentration of the corresponding i-layer and n-layer by using a Hall effect; obtaining a current-voltage curve of the pin-type GaN avalanche detector device during reverse bias under the condition of no illumination, and reading a critical reverse voltage value whenthe current just begins to be exponentially increased; establishing an electric field intensity distribution diagram E-x of the pin-type GaN avalanche detector device under reverse bias according toa Poisson equation; and according to the maximum electric field intensity when the gallium nitride material is just subjected to avalanche breakdown, reversely deducing the p-layer carrier concentration according to the measured critical reverse voltage value in combination with an electric field intensity distribution diagram. The test method disclosed by the invention is a non-consumable test method, and can be used for repeatedly detecting the sample.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI

Transportation robot capable of climbing stairs

PendingCN109649519ARealize automatic up and downRealize automatic up and down stairsEndless track vehiclesEngineeringHeavy load
The invention relates to a transportation robot capable of climbing stairs. The transportation robot comprises a material storage box, a distribution box and running tracks, the distribution box comprises driving mechanisms, supporting mechanisms and balance auxiliary mechanisms, the transportation robot applies traction onto the running tracks by driving force of the driving mechanisms, the running tracks contact with steps of the stairs by the acting force of the supporting mechanisms when the transportation robot climbs the stairs, and the running tracks consistently and obliquely contact with the stairs by the acting force of the balance auxiliary mechanisms when the transportation robot goes down the stairs. The transportation robot has the advantages that the traction is applied ontothe running tracks by the driving mechanisms on the distribution box, so that movement of the running tracks is controlled, contact among the running tracks and the steps of the stairs is guaranteedby the acting force of the supporting mechanisms in the stair climbing process, so that stability of the transportation robot is ensured in the stair climbing process, turnover of the transportation robot can be decreased, stair climbing efficiency is improved, the carrying intensity of workers is relieved, and safety in heavy object carrying is improved.
Owner:STATE GRID ZHEJIANG CIXI POWER SUPPLY +1

Conductive paint for anode steel claws

The invention provides conductive paint for anode steel claws. The conductive paint comprises, by weight, 18%-22% of a conductor, 2%-8% of curing agent, 0.2%-1.8% of dispersing agent, 7%-23% of film-forming agent and the balance deionized water. The conductor comprises 17%-19% of graphite and 1%-3% of high-polymer carbon fiber, the curing agent is mixture of 1%-4% of potassium fluosilicate and 1%-4% of sodium fluorosilicate, the dispersing agent is mixture of 0.1%-0.9% of polypropylene glycol and 0.1%-0.9% of tannic acid, and the film-forming agent is mixture of 2%-10% of potassium silicate and 5%-13% of sodium silicate. Compared with the prior art, the conductive paint has the advantages that the graphite and the polyacrylonitrile of the high-polymer carbon fiber are used as the main conductor of the composite conductive paint, the potassium silicate and the sodium silicate are used as the film-forming agent of the composite conductive paint, the potassium fluosilicate and sodium fluorosilicate are used as the curing agent of the composite conductive paint, the polypropylene glycol and the tannic acid are used as the dispersing agent of the composite conductive paint, accordingly, shortcomings of graphite oil technologies can be overcome, the contact quality of the steel claws and phosphorous pig iron can be obviously improved, and iron carbon pressure drop can be greatly reduced.
Owner:HUNAN CHUANGYUAN ALUMINUM IND
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