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64results about How to "Demand adaptation" patented technology

Network file system access method, device and system

The invention relates to the technical field of cluster network attached storage and discloses a network file system access method and device. The method comprises the following steps: receiving network file system input / output request; if the mount point corresponding to the request is in cluster state, distributing the IP addresses of the remote server providing the network file system according to the request; and utilizing the distributed IP addresses to perform network file system access. By using the network file system access method, device and system of the invention, a plurality of different cluster NAS nodes in the cluster can be selected for NFS shared access so as to realize the load balance among the cluster NAS nodes and the maximization of the resource utilization.
Owner:CHENGDU HUAWEI TECH

Flexible metal sheet shearing center

The invention discloses a flexible metal sheet shearing center, belonging to the technical field of metal plate shearing machinery. The flexible metal sheet shearing center is structurally characterized in that a track section (I) and a roller way section (III) are mounted at the front end of a shearing section (IV) on a shearing center production line in sequence, wherein an unloading section (V) and a material collecting section (VI) are mounted on the rear surface of the shearing section (IV) in sequence; a loading trolley is placed on the track section (I); a portal jib crane is mounted on the rear half part of the track section (I) and the front half part of the roller way section (III), a vacuum chuck is arranged on the lower part of a travelling jack of the portal jib crane, a clamp mechanism for aligning and clamping materials, and feeding the materials to a shearing mechanism is arranged at the foremost end of the roller way section (III); an unloading device and a material collecting device are mounted behind a shearing machine in sequence. The flexible metal sheet shearing center has the advantages of automatically completing a process from preparing sheet materials to collecting sheared materials, relieving the labor intensity of workers and improving the production efficiency and the product quality.
Owner:TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Dedicated infant formula for infant boys

ActiveCN103404595AMeet intellectual development needsDemand adaptationMilk preparationDocosahexaenoic acidVegetable oil
The invention provides a dedicated infant formula for infant boys, which comprises raw milk, demineralized whey powder, vegetable oil, docosahexaenoic acid (DHA), prebiotics, taurine, L-carnitine and / or L-carnitine salt, choline substances, composite nucleotide and mineral substances. The dedicated infant formula optimizes the ratio of intelligence nutrient substances (DHA, ARA, choline and the like), especially improves the content of the DHA and the like to be more suitable for the intelligence development requirement of the infant boys, optimizes the content of the prebiotics to be more in tune with the digestive absorption requirement of the infant boys, and further optimizes the ratio of energy substance, protein, fat, carbohydrate and the like to be more suitable for the requirement of the infant boys.
Owner:北安宜品努卡乳业有限公司

Preparation method of high-dispersion lamellar nanometer ceric oxide/graphene composite material

The invention provides a simple and convenient method for preparing a high-dispersion lamellar nanometer ceric oxide / graphene composite material. The simple and convenient method is characterized in that low-cost graphite oxide, an organic raw material and a dimethylformamide (DMF) solution are adopted, acrylamide is used as an additive, hydrazine hydrate is used as a reducing agent, and the distribution and the size of ceric oxide nanometer particles loaded on the surface of graphene can be obviously improved by using a simple water bath reaction and changing the addition amount of the acrylamide. The simple and convenient method is simple to operate; the raw materials are cheap and easy to obtain; the high-dispersion lamellar nanometer ceric oxide / graphene composite material is easy to industrialize and has a wide practical application prospect.
Owner:NANJING UNIV

Minitype jetting type washing machine

The invention relates to a minitype jetting type washing machine which comprises a fixing frame and a clothes hanging piece used for hanging clothes. The clothes hanging piece is arranged in the fixing frame. The minitype jetting type washing machine further comprises a jetting device, a moving device and a control device. The jetting device comprises a pumping mechanism and a spray nozzle, wherein the pumping mechanism is connected with the spray nozzle and used for sucking liquid or gas to the spray nozzle, and the spray nozzle is used for jetting the liquid or the gas towards the clothes. The moving device is arranged on the fixing frame and comprises an X-axis moving mechanism, a Y-axis moving mechanism and a moving unit. The moving unit moves along the X axis or the Y axis relative to the fixing frame through the corresponding X-axis moving mechanism or the Y-axis moving mechanism. The spray nozzle is arranged on the moving unit and moves along with the moving unit. The control device is used for controlling the operation of the jetting device and the moving device. The automatic washing machine integrates washing, rinsing and air drying and has the advantages of being simple in structure and good in washing effect.
Owner:XIAMEN UNIV OF TECH

Process for producing granular tea

The production process of granular tea includes the technological steps of: picking fresh tea leaf, crushing, fermentation, pelletizing, wetting and sieving, stoving, eliminating impurity and packing. The product is heavy and round grains with different sizes obtained via altering sieve, and has rich fragrance, rich tea taste, red and bright tea color and other features; and the technological process is environment friendly, hygienic and efficient and can make full use of tea resource.
Owner:王松立 +1

General development platform and development method for greenhouse remote intelligent control system

The invention discloses a general development platform and a development method for a greenhouse remote intelligent control system. The general development platform for the greenhouse remote intelligent control system comprises a server, a remote browser, a monitoring device, an execution device, a transmission module, and a control module, wherein the server runs a web server, a greenhouse intelligent control module and an interlayer, the remote browser accesses the server through a network, the monitoring device is used for monitoring environmental parameters of a greenhouse, the execution device is used for executing a control instruction of the server, the transmission module receives and transmits data of the execution device and the monitoring device, the control module sends the control instruction of the server to the execution device and the monitoring device through the transmission module, and the greenhouse intelligent control module adds or deletes relationships between the devices. According to the general development platform and the development method for the greenhouse remote intelligent control system, the defect that structures and control rules of existing greenhouse intelligent control systems are difficult to change is overcome, and the greenhouse remote intelligent control system can be conveniently and rapidly developed or modified.
Owner:CAU XIANFEI AGRI ENG TECH BEIJING

Appropriate-temperature and appropriate-humidity environment control system based on human body thermal comfort mechanism

The invention discloses an appropriate-temperature and appropriate-humidity environment control system based on a human body thermal comfort mechanism. The appropriate-temperature and appropriate-humidity environment control system comprises an intelligent environment control gateway and an indoor environment sensor, an outdoor meteorological parameter acquisition system, a multi-split air conditioner unit, a fresh air unit and an information acquisition device which are connected with the intelligent environment control gateway. According to the appropriate-temperature and appropriate-humidity environment control system based on the human body thermal comfort mechanism, a dynamic indoor thermal environment has the obvious benefits on the health and the comfortableness of a user, an air conditioning system adopting intelligent learning is more humanized, the user experience can be better improved, and the user requirements are met.
Owner:MCC REAL ESTATE GRP CO LTD

Communication method and device

The invention relates to a communication method and device, which are used for enabling a mode of informing terminal equipment of selected modulation coding mode information to better adapt to the requirement of URLLC service. The communication method comprises the following steps: determining a modulation and coding mode index; determining first information; determining modulation coding mode information corresponding to the modulation coding mode index according to the first information; wherein the determination of the first information comprises: determining the first information accordingto the received DCI, or determining the first information according to the frequency of receiving the first HARQ response information in the first time window and / or the frequency of not receiving the first HARQ response information, the first HARQ response information being the first positive response information or the first negative response information.
Owner:HUAWEI TECH CO LTD

Preparation method of oat beta-glucan

InactiveCN111978430APromote decompositionStimulates breakdown and separation of beta-glucan from oat branBulk chemical productionDissolutionIsoelectric point
The invention discloses a preparation method of oat beta-glucan. The preparation method comprises the steps of performing degreasing treatment on raw materials to enable subsequent effective components to be dissolve out and reduce impurities, performing water extraction, and performing electrolysis treatment on a mixed solution to promote separation and dissolution of beta-glucan in oat bran; after electrolytic treatment, performing ultrasonic treatment and enzymolysis treatment to promote complete release of the beta-glucan, so as to effectively increase the extraction rate of the beta-glucan; and removing the impurities through isoelectric precipitation, flocculent precipitation and alcohol precipitation in the extraction process to ensure the purity of the product, and finally, obtaining products with different molecular weights by series separation of separation membranes with different specifications. The preparation method is simple, the requirements of various fields are met, finally, the chemical structure of the beta-glucan can be prevented from being damaged to the maximum extent in a vacuum drying mode, the excellent chemical activity of the beta-glucan is maintained, and the preparation method has high practical application value.
Owner:广州贝塔健康生物科技有限公司

Dual-X-shaped spacecraft thruster and layout method thereof

ActiveCN104249817ASmall space resource requirementsReduce the impactSpacecraft guiding apparatusAttitude controlOn board
The invention discloses a dual-X-shaped spacecraft thruster and a layout method thereof. The spacecraft thruster comprises a main branch A and a backup branch B, wherein the main branch A is provided with six thruster bodies A1, A2, A3, A4, A5 and A6, the backup branch B is provided with six thruster bodies B1, B2, B3, B4, B5 and B6, the spacecraft thruster is provided with the 12 thruster bodies in total, eight thruster bodies are in a dual-X-shaped layout, and the thruster bodies are arranged on a baseplate of a spacecraft, have three-axis attitude control and single-axis orbit control capabilities and are fully backuped. The problem about thruster layout under the conditions of limited layout space of the spacecraft and limited on-board resources is mainly solved, configuration is simple and reasonable, resource demand is small, and the requirements on complicated attitude and orbit control can be met. The spacecraft thruster and the layout method thereof are applicable to spacecraft platforms limited in layout space and resources and have high engineering application value.
Owner:SHANGHAI SATELLITE ENG INST

Software generation system and method

ActiveCN102053855ABalance the difficulty of multi-version managementBalance needsProgram controlMemory systemsInterface selectionSoftware generation
The invention discloses a software generation system and method and overcomes the defect that multiple versions of software in the prior art are inconvenient to manage and maintain. The method comprises the following steps: selecting a corresponding function module by means of a pattern configuration interface, and recording the selection result in a record file; judging whether the target source code or target configuration corresponding to the selected function module is changed in accordance with the record file or a source code file; if so, compiling the target source code, and storing the compilation result in a temporary system directory; if not, extracting the compilation result corresponding to the function module, and storing in the temporary system directory; copying a basic system file into the temporary system directory; and releasing the compilation result and the basic system file in the temporary system directory to generate software. In the technical scheme in the invention, the user requirements and the multi-version management difficulty of the software are effectively balanced, and the requirements of more users without increasing the software management and maintenance difficulty can be met.
Owner:内蒙古浪潮信息科技有限公司

Mask wearing condition monitoring system and method based on probabilistic neural network

The invention relates to a mask wearing condition monitoring system and method based on a probabilistic neural network, and the system comprises: an input management module which is responsible for the reading and preprocessing of an input video; the target detection and segmentation module that is responsible for detecting and identifying each target in the video and segmenting the pedestrian mask part for detection; the multi-target tracking association module that performs many-to-many association on the detection result in each video in the video; the mask monitoring module that is used for carrying out low confidence coefficient and track discretization after completing preliminary track association; the output module that is arranged at a unified data center node, supports multi-pathcross-camera data output, performs multi-target tracking on each scene, and uniformly converges and outputs a calculation result; the system setting module that is used for configuring training of anetwork model used in the plurality of modules. Technical support is provided for the fields of video monitoring, behavior analysis and the like.
Owner:BEIHANG UNIV

Meniscus gelatinizing device for single-sided gelatinizing of steel band tapes

The invention discloses a meniscus gelatinizing device for the single-sided gelatinizing of steel band tapes, which belongs to the field of steel band tape gelatinizing devices for grating ruler manufacturing. The device comprises a driven steel band plate, two steel band plate brackets, a steel band tape horizontal positioning device, a slit plating rod, a glue conveying pipe, a delivery pump, a glue container, a glue solution solidifying device, a driving steel band plate, a vacuumizing system and a driving device, wherein the slit plating rod is located between the driven steel band plate and the driving steel band plate and arranged below the motion plane of a steel band; and the two ends of the delivery pump are connected with the glue conveying pipe, and the glue container is connected with the slit plating rod through the glue conveying pipe and the delivery pump. By using the device disclosed by the invention, a meniscus gelatinizing method can be applied to a one-time gelatinizing process of steel band tapes belonging to a wide and large-surface flexible material, the utilization rate and recovery rate of a glue solution for film coating are both relatively high, and the thickness of a coated film formed by the glue solution can be precisely controlled, and uniform; and in addition, the glue solution for film coating required by the gelatinizing device is easy to prepare, and therefore, the gelatinizing device can well satisfy the gelatinizing requirements of the coated films of the steel band tapes.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Cascade-heating multimode-coupled heat pump water heater

The invention relates to a cascade-heating multimode-coupled heat pump water heater which comprises an evaporator, a first compressor, a first stop valve, a second stop valve, a second compressor, a first expansion valve, a second condenser, a first condenser, a water pump, a third stop valve, a fourth stop valve, a fifth stop valve, a sixth stop valve, a seventh stop valve, an eighth stop valve,a ninth stop valve, a tenth stop valve, a flow regulating valve, a water tank, a first water mixing valve, a second water mixing valve, a third water mixing valve and an eleventh stop valve. Accordingto the cascade-heating multimode-coupled heat pump water heater, two-stage compression and two-stage throttling heat pump cycle is switched in multiple modes to independently heat multiple stratifiedzones with different temperatures in the water tank; by switching the different stop valves, the separate heating mode for the stratified zones with different setting temperatures is realized in different coupling modes, and the mode of taking water from the stratified zones with different temperatures is adopted. The heat production efficiency is high.
Owner:ZHEJIANG UNIV OF TECH

Process for producing granular tea

The production process of granular tea includes the technological steps of: picking fresh tea leaf, crushing, fermentation, pelletizing, wetting and sieving, stoving, eliminating impurity and packing. The product is heavy and round grains with different sizes obtained via altering sieve, and has rich fragrance, rich tea taste, red and bright tea color and other features; and the technological process is environment friendly, hygienic and efficient and can make full use of tea resource.
Owner:王松立 +1

Control method and device for air conditioner and air conditioner

The invention relates to the technical field of intelligent household appliances, and discloses a control method for an air conditioner. The control method comprises the steps that a baby information base is obtained, and a plurality of behavior states of babies and environment parameter requirements of the babies at all month age stages under different behavior states are stored in the baby information base; under the condition that the infant is detected in the associated area of the air conditioner, monthly age information of the infant and the current behavior state of the infant are obtained; a target environment parameter requirement of the infant matched with the current behavior state and meeting the month age information is determined from an infant information base; and the air conditioner is controlled to operate in a target operation mode corresponding to the target environment parameter requirement. The air conditioner is controlled to operate according to the month age information and the current behavior state of the baby, the air conditioner is controlled to operate according to the target environment parameter requirement, and the requirement of the baby for the environment can be well met. The invention further discloses a control device for the air conditioner and the air conditioner.
Owner:QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD +2

Vertical multi-cylinder or single-cylinder hydraulic briquette extruder with helical impeller feeding

The invention relates to a vertical multi-cylinder or single-cylinder hydraulic briquette extruder with helical impeller feeding. The vertical multi-cylinder or single-cylinder hydraulic briquette extruder comprises one group or at least two groups of laterally feeding helical impeller feeding parts, one group or at least two groups of multi-cylinder or single-cylinder hydraulic molding parts which are subjected to longitudinally hydraulic molding and a PLC (Programmable Logic Controller) control part, wherein each helical impeller feeding part comprises a motor, a cycloidal pin wheel speed reducer, a coupler and an impeller shaft, the impeller shaft is arranged in a bearing pedestal and a conveying barrel, helical blades are welded on the impeller shaft, and a feeding hopper is arranged at the top of the front end of the conveying barrel; each vertical type multi-cylinder or single-cylinder hydraulic molding part comprises an oil cylinder, an extrusion piston, a briquette cavity and a briquette nose, the oil cylinder and the extrusion piston are fixedly arranged at the upper part of a rack longitudinally, the briquette cavity and the briquette nose are fixedly arranged at the lower part of the rack, and the extrusion piston is driven by the oil cylinder to move up and down in the briquette cavity; a feeding port is arranged at the upper end of the briquette cavity and is connected with the conveying barrel. Mechanical energy is converted into pressure intensity energy, made briquettes have a low water content, the yield is high, electricity consumption is reduced, and automatic control is realized.
Owner:闵和清

Meniscus gelatinizing device for single-sided gelatinizing of steel band tapes

The invention discloses a meniscus gelatinizing device for the single-sided gelatinizing of steel band tapes, which belongs to the field of steel band tape gelatinizing devices for grating ruler manufacturing. The device comprises a driven steel band plate, two steel band plate brackets, a steel band tape horizontal positioning device, a slit plating rod, a glue conveying pipe, a delivery pump, a glue container, a glue solution solidifying device, a driving steel band plate, a vacuumizing system and a driving device, wherein the slit plating rod is located between the driven steel band plate and the driving steel band plate and arranged below the motion plane of a steel band; and the two ends of the delivery pump are connected with the glue conveying pipe, and the glue container is connected with the slit plating rod through the glue conveying pipe and the delivery pump. By using the device disclosed by the invention, a meniscus gelatinizing method can be applied to a one-time gelatinizing process of steel band tapes belonging to a wide and large-surface flexible material, the utilization rate and recovery rate of a glue solution for film coating are both relatively high, and the thickness of a coated film formed by the glue solution can be precisely controlled, and uniform; and in addition, the glue solution for film coating required by the gelatinizing device is easy to prepare, and therefore, the gelatinizing device can well satisfy the gelatinizing requirements of the coated films of the steel band tapes.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Cascade heating multi-mode coupled multi-water-tank dual compression heat pump water heater

The invention discloses a cascade heating multi-mode coupled multi-water-tank dual compression heat pump water heater. The water heater comprises an evaporator, a first compressor, a first stop valve,a second stop valve, a second compressor, a first expansion valve, a second expansion valve, a heat regenerator, a third expansion valve, a second condenser, a first condenser, a water pump, a thirdstop valve, a fourth stop valve, a fifth stop valve, a sixth stop valve, a seventh stop valve, an eighth stop valve, a ninth stop valve, a tenth stop valve, a flow adjusting valve, a first water tank,a second water tank, a third water tank, a first water mixing valve, a second water mixing valve, a third water mixing valve and an eleventh stop valve. The two-stage compression two-stage throttlingtype heat pump circulation is adopted for carrying out cascade heating on the multiple water tanks with different set temperatures through multi-mode switching, the water tanks with different set temperatures are separately heated by switching the different stop valves in different coupled modes, and water is taken out from the water tanks with different set temperatures. The cascade heating multi-mode coupled multi-water-tank dual compression heat pump water heater is high in heat production efficiency.
Owner:ZHEJIANG UNIV OF TECH

Assembling support of seat

The invention provides an assembling support of a seat. The assembling support comprises a base support, a backrest support and a headrest support. The base support comprises a base body outer frame,and handles are fixedly arranged on the two sides, close to the front end, of the base body outer frame. The backrest support comprises a backrest outer frame, and an upper lug pipe and a lower lug pipe are fixedly arranged on the left side and the right side of the backrest outer frame respectively. Base body embedded iron used for being connected with the backrest outer frame is fixedly arrangedon the two sides, close to the rear end, of the base body outer frame, and backrest embedded iron used for being connected with the base body outer frame is fixedly arranged on the two sides of the lower end of the backrest outer frame. A headrest outer frame is fixedly arranged at the top of the backrest outer frame, and headrest embedded iron used for being connected with the headrest support is fixedly arranged in the middle of the headrest outer frame. The headrest support comprises a headrest fixing piece and a headrest movable piece, the headrest fixing piece is fixedly connected with the headrest embedded iron, the headrest movable piece is connected with the headrest fixing piece, the position of the headrest movable piece relative to the headrest fixing piece in a vertical direction is variable, and the headrest movable piece can be disengaged from the headrest fixing piece. The assembling support is stable in structure and convenient to assemble.
Owner:DIRIX TECH WUXI CO LTD

Programmable spinning machine motion simulation test platform

The invention discloses a programmable spinning machine motion simulation test platform, which comprises a traveler, a ring, a high-speed DC motor, a slender metal connection rod with a hole at the front end, a photoelectric rotation speed sensor, a sensor support, a high-strength light thin line, a single chip microcomputer system for rotation speed control and a Tiny6410 embedded core board with a touch screen. In the case of work, the traveler is driven by the metal connection rod and the light thin line to rotate at a high speed at the edge of the ring, thereby simulating the high-speed rotation working state of the traveler during a yarn winding process. Rotation speed sensors are arranged at upper and lower relative positions near the ring, and each sensor comprises a light transmitter and a light receiver which are independent and placed relatively for detecting the actual rotation speed and a line-breaking state of the traveler. Through comparing the detection result of the measured sensor and the actual motion state of the traveler, calibration and detection of the measured sensor are realized automatically. The working mode of the test platform is programmable, the cost is low, the mounting is convenient, and the quality of the sensor can be automatically and easily detected.
Owner:SHANDONG UNIV

Optical adhesive with low gel fraction and preparation method thereof

The invention discloses an optical adhesive with low gel fraction. The optical adhesive is prepared from the following substances: 0 to 80 parts of 2-ethylhexyl acrylate, 0 to 30 parts of hydroxyethyl acrylate, 0 to 15 parts of isobornyl acrylate, 0 to 5 parts of isocyanate ethyl acrylate and 0 to 0.5 part of a photoinitiator. The invention relates to a preparation method of an optical adhesive with low gel fraction. The preparation method comprises the following steps: 1, mixing 0-80 parts of 2-ethylhexyl acrylate, 0-30 parts of hydroxyethyl acrylate, 0-15 parts of isobornyl acrylate, 0-5 parts of isocyanate ethyl acrylate and 0-0.5 part of the photoinitiator to obtain an optical prepolymer; 2, adding a polyfunctional group monomer into the optical prepolymer, coating on a base film, and then carrying out UV light irradiation; and 3, irradiating the coated base film under UV light, reacting and curing to obtain the optical adhesive film; 4, carrying out heat preservation on the coated optical adhesive film at 40-120 DEG C for 12-72 hours, and carrying out deep curing crosslinking. The gel fraction of the optical adhesive can be controlled according to different requirements, so that the optical adhesive can adapt to different requirements.
Owner:世星科技股份有限公司

Low temperature heat-pump water heater capable of cascade heating multimode coupling layered water discharge

The invention discloses a low temperature heat-pump water heater capable of cascade heating multimode coupling layered water discharge. The low temperature heat-pump water heater comprises an evaporator, a first compressor, a first stop valve, a second stop valve, a middle heat exchanger, a first expansion valve, a second compressor, a first condenser, a second condenser, a second expansion valve,a water pump, a third stop valve, a fourth stop valve, a fifth stop valve, a sixth stop valve, a seventh stop valve, an eighth stop valve, a ninth stop valve, a tenth stop valve, a flow regulating valve, a water tank, a first water mixing valve, a second water mixing valve, a third water mixing valve and an eleventh stop valve. Two types of coupling heat pump circulation are adopted to independently heat a plurality of different temperature stratification areas in the water tank through switching of multiple modes; and the manner that different temperature stratification areas are independently heated under different coupling modes through switching of different stop valves is adopted. The low temperature heat-pump water heater disclosed by the invention is higher in operating stability and larger in working range.
Owner:ZHEJIANG UNIV OF TECH

Multifunctional monitoring and nursing device for cardiology department

The invention discloses a multifunctional monitoring and nursing device for the cardiology department,which comprises a bed body. A support is arranged on the bed body, and a monitoring device used for displaying various data of the body of a patient is arranged on the support. A movable plate is arranged below the support, and a massage box used for massaging the back of a patient is arranged at the bottom of the movable plate. A plurality of movable rods are arranged at the lower end of the massage box in a sliding manner; the lower end of the movable rod is provided with a massage head used for making contact with the back of a patient. According to the multifunctional monitoring and nursing device for the cardiology department, through cooperation of a movable rod, a massage head, a reset spring and a pushing mechanism, the back of a patient can be massaged comprehensively and quickly, the massage frequency can be controlled by controlling the rotating speed of a pushing motor, and therefore the requirements of different patients are met; by arranging the height adjusting mechanism, the vertical height of the massage box can be conveniently adjusted so as to meet the requirements of different patients.
Owner:HUBEI POLYTECHNIC INST

Reflow soldering clamping and positioning device of microwave assembly

The invention discloses a reflow soldering clamping and positioning device of a microwave assembly. The microwave assembly comprises a shell and a circuit board, wherein the clamping and positioning device comprises a base, a plurality of positioning parts, at least two shell pressing assemblies and a circuit board pressing block assembly. Each positioning part is arranged on the base, and the positioning parts are used for positioning the relative position of the shell on the base; each shell pressing assembly is connected with the base, and the shell pressing assemblies are used for pressingthe shell on the base; and the circuit board pressing block assembly is connected with the base and used for pressing the circuit board on the shell. The reflow soldering clamping and positioning device of the microwave assembly can conveniently, quickly and accurately position and clamp the microwave assembly, and solves the technical problem in the prior art that the reflow soldering clamping and positioning device is not suitable for the microwave assembly containing the printed board or a microstrip board, the shell and electronic components.
Owner:SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST

Method for preparing high-toughness high-temperature-resistant directionally-arranged silicon nitride monolithic porous ceramic

The invention relates to a method for preparing high-toughness and high-temperature-resistant silicon nitride monolithic porous ceramic, which comprises the following steps of: preparing beta-Si3N4 whiskers with high length-diameter ratio by using alpha-Si3N4 as a raw material and Y2O3 as an auxiliary agent through a normal-pressure sintering method, preparing tape casting slurry from the prepared beta-Si3N4 whiskers, directionally arranging the silicon nitride whiskers by using tape casting to prepare a thin film, and carrying out laminated sample preparation, thereby obtaining the high-toughness and high-temperature-resistant silicon nitride monolithic porous ceramic. SiO is subjected to high-temperature evaporation gas phase infiltration and reacts with residual carbon among fibers to obtain silicon nitride, and the silicon nitride monolithic porous ceramic material is prepared; the structure design thought of fiber directional arrangement and secondary silicon nitride bonding is provided, effective preparation of the porous ceramic constructed by the pure silicon nitride fibers is achieved, the advantage of anisotropy of the porous ceramic is exerted through directional arrangement, and therefore the fracture toughness of the silicon nitride ceramic is effectively improved, the high-temperature resistance is improved to the maximum extent through bonding of pure silicon nitride, and the service life of the porous ceramic is prolonged. The application range of the porous silicon nitride ceramic material is greatly expanded.
Owner:XI AN JIAOTONG UNIV
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