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31results about How to "Density Requirements Reduced" patented technology
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Indoor wireless positioning method by utilizing fingerprint technique
ActiveCN103139907ADensity Requirements ReducedReduce workloadWireless communicationTraining phaseAlgorithm
The invention discloses an indoor wireless positioning method by utilizing fingerprint technique. The indoor wireless positioning method by utilizing the fingerprint technique largely lowers the requirements for the density of sampling points, enriches distribution information of signal strength, lightens the workload, and keeps high-precision positioning results. The indoor wireless positioning method by utilizing the fingerprint technique comprises an off-line training phase and an on-line training phase. The off-line training phase includes the following steps: firstly, an indoor environment is set up and signal strength data are acquired; secondly, an original fingerprint database with a low sampling rate is constructed; and thirdly, the original fingerprint database is reconstructed through a low-order matrix fill model, the low-order matrix fill model is minrank (X) s.t.A(X) = B. In the on-line training phase, signal strength vectors used for testing and the signal strength vector of each sampling point in the reconstructed fingerprint database are compared and matched, and position coordinates of a present position are estimated by utilizing the point coordinates of the known sampling points to obtain on-line positioning coordinates.
Owner:BEIJING UNIV OF TECH
Indoor positioning method and device based on Wi-Fi hot spots
InactiveCN107517446ALow costDensity Requirements ReducedUsing reradiationLocation information based serviceWi-FiReference sample
The invention discloses an indoor positioning method based on Wi-Fi hot spots. The method includes: building a fingerprint database; determining multiple target reference sample points from multiple reference sample points according to the received signal strength, from each Wi-Fi hot spot, at each reference sample point in the fingerprint database and the received signal strength, from multiple Wi-Fi hot spots, at the to be positioned target, wherein the distance between the target reference sample points and the to be positioned target is in a preset range; determining the positions of the target reference sample points according to the fingerprint database so as to determine the position of the to-be-positioned target. Due to the fact that the multiple target reference sample points are determined during positioning in real time and the distance between the target reference sample points and the to-be-positioned target is in the preset range, the acquired target reference sample points are suitable for the positioning of the to-be-positioned target at a current position, introduction of reference sample points with large deviation due to the fact a fixed k value is used is avoided, and the position of the to-be-positioned target can be estimated accurately.
Owner:CHIGOO SHANGHAI INTERACTIVE TECH CO LTD
Densification method of porous workpiece
The invention discloses a densification method of a porous workpiece. The method comprises the following steps: placing the porous workpiece in a jacket, and performing seal welding on a joint between the jacket and an end cover; performing leak detection for the jacket; after the tightness of the jacket is ensured, filling glass powder in the jacket, and shaking to be solid; vacuumizing the jacket and performing seal welding on a suction pipe to obtain a compact; performing hot isostatic pressing treatment on the compact; and after a hot isostatic pressing hearth is cooled, taking out the compact, and removing the glass and the jacket from the surface of the workpiece to obtain a dense workpiece. The method with a metal jacket and glass powder as force transfer media, can be used for processing any porous workpieces with complicated shapes and relative density being less than 90%, and is particularly suitable for densifying sintering pieces and castings such as SLS / SLM and the like.
Owner:HUAZHONG UNIV OF SCI & TECH
Underground coal mine personnel positioning system and positioning method
InactiveCN103228041ASmall amount of calculationDensity Requirements ReducedMining devicesWireless communicationSystem testingTriangulation
The invention discloses an underground coal mine personnel positioning system and an underground coal mine personnel positioning method. The underground coal mine personnel positioning system comprises a ground control center which is arranged aboveground, and a transmitting base station, multiple gateway nodes, an optical fiber, a bus, multiple beacon nodes and multiple mobile nodes which are arranged underground, wherein all the underground equipment is intrinsically safe. The underground coal mine personnel positioning method is a BP (Back Propagation) neural network-based and non-ranging APIT (Approximate Point-in-triangulation Test) underground personnel positioning method. The underground coal mine personnel positioning method comprises the following steps: according to the structure of an underground laneway, deploying the beacon nodes; in a training state, generating coordinates of intersection points of every two circumcircles of three intersected triangles which are formed by the beacon nodes through training, and storing the coordinates in a database; in a positioning stage, testing according to a PIT (Power Interruption Test) test system to obtain rough positions of unknown nodes; comparing the rough positions with information in the database, and deploying mobile nodes at corresponding coordinate positions; and testing by using the PIT test system for precise positioning. The underground coal mine personnel positioning method has the advantages of high positioning accuracy, small calculating amount and small influence from the density of the beacon nodes.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Sensor node locating method and device based on sequences
InactiveCN103458504AGood robustnessImprove matching accuracyNetwork topologiesSensor nodeSignal strength
The invention relates to a sensor node locating method and device based on sequences. The sensor node locating method comprises the following steps that a sensor node to be located collects the signal strength indication values of a plurality of beacon nodes within the communication range; regional division is conducted according to the coordinate position of each beacon node and the communication range of each beacon node, and sorting is conducted on the signal strength in each region to obtain the signature sequences; a plurality of detection sequences and the signature sequences undergo matching calculation sequentially; the sensor node to be detected collects the coordinate positions of beacon nodes beyond a first jump range and the coordinate positions of a located quasi beacon node; a perpendicular bisector is respectively and sequentially drawn between each beacon node beyond the first jump range and a corresponding beacon node within the first jump range and between each quasi beacon node and a corresponding beacon node within the first jump range to obtain a final region to be located; the centroid of the region to be located serves as the coordinate position of the sensor node to be located. The sensor node locating method and device based on the sequences have robustness, have higher matching precision and lower the requirements for the intensity of the beacon nodes.
Owner:INST OF INFORMATION ENG CAS
High-Mo Ni3Al-based monocrystal high-temperature alloy modified by rare earth and preparation method of high-Mo Ni3Al-based monocrystal high-temperature alloy
InactiveCN106521244AImproves antioxidant propertiesLow densityPolycrystalline material growthFrom frozen solutionsRare-earth elementOxidation resistant
The invention discloses high-Mo Ni3Al-based monocrystal high-temperature alloy modified by rare earth and a preparation method of the high-Mo Ni3Al-based monocrystal high-temperature alloy and belongs to the technical field of high-temperature alloy. The alloy comprises Ni, Al, Mo, Re, Ta, Cr, C, Y and Dy or Ce, an alloy casting-state structure comprises three phase structures including the gamma' phase, the gamma phase and the white precipitated phase rich in Mo and Re, the density is 7.9-8.1 g / cm<3>, and the alloy can reach the complete oxidization resistance level or the oxidization resistance level or the secondary oxidization resistance level at the temperature of 1100 DEG C. The method comprises the steps of preparing a liquid metal cooling medium, preparing a mother alloy bar, preparing Ni3Al-based monocrystal alloy seed crystals not containing rare earth elements, preparing high-Mo Ni3Al-based high-temperature alloy containing the rare earth elements through a direction monocrystal furnace, and conducting post heat treatment. The Ni3Al-based monocrystal high-temperature alloy provided by the invention is low in density and can meet the low-density requirement of aircraft engines, and the oxidization resistance of the alloy can reach the complete oxidization resistance level or the oxidization resistance level or the secondary oxidization resistance level at the temperature of 1100 DEG C.
Owner:BEIHANG UNIV
1S1R memory integrated structure and preparation method thereof
ActiveCN108630810ALower requirementSuppress leakage currentSolid-state devicesSemiconductor devicesPower flowElectrical and Electronics engineering
The invention provides a 1S1R memory integrated structure and a preparation method thereof. The 1S1R memory integrated structure comprises a word line metal, a resistive change material layer, a gatetube lower electrode, a gate tube material layer, a gate tube upper electrode, an interconnecting wire and a bit line metal, wherein the gate tube material layer is in the shape of a groove, and the gate tube upper electrode is formed in the groove. According to the 1S1R memory integrated structure and the preparation method thereof disclosed by the invention, the device area of a gate tube is much bigger than that of a memory through the change of the integrated position of the gate tube, so that the requirement on the ON state current density of the gate tube is reduced obviously.
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI
Transparent liquid variable temperature viscosity coefficient measurement device based on video
PendingCN109253945AEliminate measurement errorsDensity Requirements ReducedFlow propertiesMeasurement deviceEngineering
The invention discloses a transparent liquid variable temperature viscosity coefficient measurement device based on a video and belongs to the technical field of viscosity coefficient measurement. Thetechnical scheme comprises the fact that a falling ball experiment component is connected with a cyclic heating medium assembly; a camera component for photographing is set at one side of the fallingball experiment component; a scale is set on the falling ball experiment component; a transparent falling ball tube cap is mounted on a vertical transparent falling ball tube; a falling ball is builtin the vertical transparent falling ball tube; a transparent tubular jacket is set out of the vertical transparent falling ball tube; and a heating medium is set between the vertical transparent falling ball tube and the transparent tubular jacket. The device has the beneficial effects that the device is convenient for recording a whole motion process when the falling ball falls, so influence ofcomplex falling ball motion on a measurement result can be timely eliminated; the viscosity coefficient can be measured through utilization of a uniform velocity method; the viscosity coefficient alsocan be measured through utilization of a nonuniform uniform motion method under the condition that uniform velocity sections are short or no uniform velocity section exists; the device is applicableto measurement of the viscosity coefficients of various transparent liquids under different temperatures; and the device has high universality.
Owner:DALIAN NATIONALITIES UNIVERSITY
Multi-accuracy node positioning method based on area judgment
ActiveCN104168579AReduce overheadAccurate positioning needsNetwork planningFingerprintDistribution characteristic
The invention discloses a multi-accuracy node positioning method based on area judgment. The multi-accuracy node positioning method based on area judgment comprises the steps that firstly, a fingerprint information difference value of a beacon node is calculated; secondly, an initial clustering center and the residual beacon nodes are clustered; thirdly, the deployment mode of the beacon nodes is judged; fourthly, a first-stage virtual block not deployed evenly is divided; fifthly, a first-stage virtual block deployed evenly is divided; sixthly, a second-stage virtual block not deployed evenly is divided; seventhly, a second-stage virtual block deployed evenly is divided; eighthly, a positioning tree based on whole-network beacon node distribution characteristics is built; ninthly, unknown nodes are positioned. The multi-accuracy node positioning method based on area judgment has low requirements for the density of beacon nodes in a monitoring area, can realize fine grit positioning, and can obtain the survival data of wild animals more conveniently and flexibly, thereby carrying out effective protection.
Owner:NORTHWEST UNIV
Indoor positioning system, indoor positioning method and mobile terminal
InactiveCN113055838ADensity Requirements ReducedParticular environment based servicesServerElectrical and Electronics engineering
The indoor positioning system comprises a to-be-positioned mobile terminal which is arranged indoors; mobile terminals which are movably arranged indoors, wherein each mobile terminal is used for broadcasting information in a communication range of the mobile terminal if the mobile terminal is static within a preset time and meets a preset condition so as to calculate position information of other mobile terminals and the mobile terminal to be positioned; at least three access points, wherein each access point has fixed position information; and a positioning server in communication connection with the mobile to-be-positioned terminal, the mobile terminals and the access points, wherein the positioning server is used for determining the position information of the to-be-positioned mobile terminal if the number of target access points of the to-be-positioned mobile terminal searched in the access points in a broadcast manner and the number of target mobile terminals of the to-be-positioned mobile terminal searched in the mobile terminals in the broadcast manner is greater than or equal to 3. The invention further provides an indoor positioning method and the mobile terminals, and the requirement for the density of the access points can be reduced.
Owner:SHENZHEN FUTAIHONG PRECISION IND CO LTD +1
Rhenium-containing Ni3Al-based single crystal alloy
InactiveCN102140597ALow densityDensity Requirements ReducedPolycrystalline material growthSingle crystal growth detailsAlloy elementSingle crystal
The invention provides a rhenium-containing Ni3Al-based single crystal alloy, which comprises the following components in percentage by weight: 7 to 8 percent of Al, 8 to 13 percent of Mo, 0.0005 to 3 percent of Re and the balance of Ni; and the rhenium-containing Ni3Al-based single crystal alloy also can contain more than one of 0.05 to 0.5 percent of Dy, 0.1 to 1 percent of Y and 0.05 to 0.5 percent of Hf. In the rhenium-containing Ni3Al-based single crystal alloy, the rhenium element is added into a Ni3Al-based single crystal alloy, so that the rhenium element is subjected to solid solution in a gamma' phase and a gamma phase and forms a rhenium atom cluster in short range order in the gamma phase. At high temperature, the diffusion coefficient of rhenium in the gamma phase and the gamma' phase is small, the diffusion coefficients of other alloy elements such as Al, Mo and the like in the gamma phase and the gamma' phase can be reduced, and the high temperature stability of the alloy is improved.
Owner:BEIHANG UNIV
Multi-section water cup
ActiveCN113116107ADensity Requirements ReducedIncrease buoyancyDrinking vesselsMechanical engineeringMechanics
Owner:ZHEJIANG DAIAN COMMODITY
Low-density foaming BMC material and preparation method thereof
The invention discloses a low-density foaming BMC material. The material comprises the following components in parts by weight: 60-70 parts of unsaturated resin, 1-2 parts of thermal expansion microspheres, 0.5-1 part of a foaming agent, 30-40 parts of a low-shrinkage additive, 0.7-1 part of a polymerization inhibitor, 1-2 parts of a wetting dispersant, 3-4.5 parts of color paste, 1-1.5 parts of athickening agent, 1-1.2 parts of a curing agent, 4-5 parts of a release agent, 100-120 parts of aluminum hydroxide, 50-80 parts of calcium bicarbonate and 20-60 parts of glass fibers. According to the invention, the density of the BMC product is effectively reduced, the material cost is greatly reduced, and the obtained BMC material has good mechanical properties and meets the expected low-density requirement.
Owner:广东百汇达新材料有限公司
A method and device for automatic calibration of laser radar parameters and laser radar
ActiveCN107179534BRealize automatic calibrationFully automaticWave based measurement systemsLaser scanningComputer science
The invention discloses an automatic calibration method and device of laser radar parameters and a laser radar. The method comprises the steps of (10) setting a first marker with a first marking point in a calibration field, using the laser radar to carry out laser scanning on the calibration field and obtaining scanning data, (20) fitting the scanning data of a position where the first marker is located, and obtaining the fitting space coordinate of the first marking point, and (30) calculating the laser radar parameters by using an error between the fitting space coordinate and the measurement space coordinate of the first marking point, and carrying out the automatic calibration by using the calculated laser radar parameters. According to the method, device and the laser radar, the fully automatic high precision calibration of the laser radar is realized, the density requirement of a laser point is low, the integrity requirement of marker scanning is low, and the automatic precision inspection and evaluation of calibrated laser radar measurement precision can be carried out.
Owner:BEIJING SURESTAR TECH
Liquid stream battery stack
InactiveCN101252200BSmall self-dischargeReduce manufacturing costElectrolyte moving arrangementsRegenerative fuel cellsFlow cellElectrical polarity
The invention provides a flow cell stack, comprising two endplates, a diaphragm, and two bipolar plates, the flow cell stack is separated into an anode electrolyte area and a cathode electrolyte areathrough the diaphragm between the two endplates, each area is provided with a bipolar plate which has the same polarity with the electrolyte of the corresponding area and the same polarity at both sides; two poles of the same bipolar plate are connected in parallel; an inlet of each bipolar plate is arranged at the same position below the bipolar plate, and an outlet of each bipolar plate is arranged at the same position above the bipolar plate. The flow cell stack is simple in structure, can reduce the requirement on the performance of the material of the bipolar plate effectively, particularly the requirement on the compactness of the bipolar plate so as to reduce the production cost effectively; meanwhile, the flow cell stack can effectively decrease the self-discharging and reduction of efficiency of the cell caused by the crossing between the anode electrolyte and the cathode electrolyte in the cell stack and prolong the service life of the cell, is suitable to be an update of theprior flow cell stack, particularly to be used on a cell stack which needs large current discharging.
Owner:CENT SOUTH UNIV +1
Locating method of wireless sensor network based on RSSI (Received Signal Strength Indicator)
InactiveCN101860959BOvercome the defect that the error of the final positioning result is too largeDensity Requirements ReducedNetwork topologiesTransmission monitoringWireless mesh networkTelecommunications
The invention relates to a locating method of a wireless sensor network based on an RSSI (Received Signal Strength Indicator), which belongs to the technical field of wireless sensor networks and comprises the following steps of: respectively measuring the RSSI values of anchor nodes and a blind node to obtain the information on the distance between the blind node and each anchor node; selecting three anchor nodes nearest to the blind node as reference nodes to perform rough locating to obtain the rough locating position of the blind node; establishing a distribution probability model of the blind node to obtain the distribution probability of the blind node in each position of the wireless sensor network; performing locating searching processing by using the rough locating position of the blind node as an initial position and L1 as step length to obtain the first locating position of the blind node; and performing locating searching by using the (N-1)th locating position as an initial position and L(N) as step length to obtain the Nth locating position of the blind node, i.e. the finial position of the blind node. The invention has low requirements for node density, no environmental interference, great improvement on locating accuracy and low locating error reduced to be between 20% and 50%.
Owner:SHANGHAI JIAOTONG UNIV
A Cell-Based Localization Method for Wireless Sensor Networks
InactiveCN101363909BDensity Requirements ReducedImprove positioning accuracyNetwork topologiesPosition fixationComputation complexityWireless sensor networking
The invention discloses a wireless sensor network positioning method based on unit grids, and the method is used for estimating the location of an undetermined location node through the intersection of a plurality of coverage areas based on the constraint from anchor nodes in a unit grid model to the communication coverage range thereof. A location constraint relationship also exists between nodes, the anchor node beacon information of which is not detected and received, and the anchor nodes, namely in the complementary set of the anchor node communication coverage range. The invention improves the location estimating precision, especially the precision and the algorithm coverage capacity of the sparse node location. The calculating and communicating expenses of the locating process are greatly reduced, and the requirements to the anchor node density are decreased; and the calculating complexity of each node is independent of the network scale and has strong anti-interference ability and certain application value, thereby effectively satisfying the requirements to the high-precision distributed location of the wireless sensor network.
Owner:NANCHANG UNIV
Novel breathable-insole manufacturing process
The invention discloses a novel breathable-insole manufacturing process. The novel breathable-insole manufacturing process includes: performing primary foaming and shaping of a raw material into test pieces; sectioning the test pieces into thickness as required according to different shoe types; gluing off the sectioned test pieces for cloth laminating; performing secondary hot press molding on the test pieces laminated with cloth prior to cutting. The test pieces foamed and shaped are of regular shapes even in thickness; during sectioning the test pieces in the step b, the test pieces are sectioned along the direction perpendicular to the thickness of the test pieces, breathable surfaces of the test pieces are preserved, and unventilated surfaces of the test pieces are removed; sectioning of two surfaces or maybe one surface of the test pieces can meet the required thickness, and the breathable surfaces are preserved; flow production is allowed, demand on density of the foamed material is reduced, working efficiency is high, and cost is lowered; breathable insoles manufactured with the process are high in elasticity, good in flexibleness, lightweight and durable and attractive.
Owner:中山杰伟鞋业有限公司 +1
An Indoor Wireless Positioning Method Using Fingerprint Method
ActiveCN103139907BDensity Requirements ReducedReduce workloadTransmissionWireless communicationTraining phaseAlgorithm
Owner:BEIJING UNIV OF TECH
Exhaust device and method for endoscopic surgery
PendingCN113975930AEnsure a healthy environmentMove fastCombination devicesDiagnosticsMedical staffEngineering
The invention relates to the field of medical suction or drawing instruments, and particularly discloses an exhaust device for endoscopic surgery. The exhaust device comprises a body, wherein a partition plate is arranged in the middle of the body, the partition plate divides the internal space of the body into a first cavity and a second cavity which are mutually independent, the top end of the first cavity is provided with a first pipe body and a second pipe body, the top end of the second cavity is provided with a third pipe body and a fourth pipe body, one end of the first pipe body and one end of the third pipe body both extend to the bottom end of the body, one end of the second pipe body and one end of the fourth pipe body both extend to the top end of the body, the second pipe body is connected with the third pipe body, and a filter element is arranged in the second cavity. The invention further discloses an exhaust method for the endoscopic surgery. According to the invention, a filter element can filter harmful smoke containing particulate matters such as PM2.5 and PM10 in gas, meanwhile, peculiar smell can be removed, and the healthy environment of the medical staff in the surgery process is guaranteed.
Owner:NINGBO MEDICAL CENT LIHUILI HOSPITACL
Device and method for preparing large number of cold molecular ions
ActiveCN113871287APrecise screeningDensity Requirements ReducedTime-of-flight spectrometersNuclear energy generationContinuous lightIon trap mass spectrometry
The invention relates to a device and method for preparing a large number of cold molecular ions, and belongs to the technical field of cold molecular ion preparation. The device integrates a magneto-optical trap for cooling and trapping neutral atoms and a linear Paul trap for trapping ions, the center of the magneto-optical trap coincides with the center of an ion trap to ensure that the center of ion cloud coincides with the center of atom cloud, and meanwhile, a micro-channel plate is used as a detection device of the ion time-of-flight mass spectrometry. According to the method, a large number of cold atoms are prepared in the magneto-optical trap through laser cooling, then a large number of ions are generated through continuous photo ionization of the cold atoms, the ions collide with the cold atoms to generate cold molecular ions, the cold molecular ions are trapped by the ion trap, then a large number of cold molecular ions are obtained, and finally clear and distinguishable molecular ion signals are obtained through the ion time-of-flight mass spectrometry. The problem that cold molecule ions are difficult to prepare and discriminate is solved.
Owner:UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
A sequence-based sensor node positioning method and device
The invention relates to a sequence-based sensor node positioning method and device, comprising the following steps: the sensor node to be positioned collects signal strength indication values of multiple beacon nodes within the communication range; according to the coordinate position and communication range of each beacon node Carry out area division, sort the signal strength in each area to obtain multiple signature sequences; match and calculate multiple detection sequences with the signature sequence table; the sensor node to be located collects the coordinate position of the beacon node outside the range of one hop and the coordinate positions of the quasi-beacon nodes that have been located; draw vertical bisectors between all beacon nodes and all quasi-beacon nodes outside the range of one hop and each beacon node within the range of one hop in order to obtain the final The area to be located; the centroid of the final area to be located is taken as the coordinate position of the sensor node to be located. The invention has good robustness and higher matching precision, and reduces the requirement on the density of beacon nodes.
Owner:INST OF INFORMATION ENG CHINESE ACAD OF SCI
A multi-precision node localization method based on region determination
The invention discloses a multi-precision node positioning method based on regional determination. The steps include: step one, calculating the fingerprint information difference value of the beacon node; step two, clustering the initial clustering center and the remaining beacon nodes; step three , determine the deployment method of the beacon node; step four, the first-level virtual block division of non-uniform deployment; step five, the first-level virtual block division of even deployment; step six, the second-level virtual block division of non-uniform deployment; Step seven, divide the virtual blocks evenly deployed at the second level; step eight, establish a positioning tree based on the distribution characteristics of beacon nodes in the entire network; step nine, position the unknown nodes. The method of the present invention does not have high requirements on the density of beacon nodes in the monitoring area, can achieve fine-grained positioning, and can obtain the survival data of wild animals more conveniently and flexibly, thereby achieving effective protection.
Owner:NORTHWEST UNIV
Composite foaming agent particles and preparation method thereof, and preparation method of aluminum foam
ActiveCN107398557BStop the spreadProtect cell shapeTransportation and packagingMetal-working apparatusFoaming agentDecomposition
The invention provides a composite foaming agent particle, which includes a titanium hydride phase and a metal phase, the metal phase covers the titanium hydride phase, and the melting point of the metal phase is lower than the decomposition temperature of the titanium hydride. The present invention also provides a method for preparing composite blowing agent particles, comprising mixing titanium hydride particles and metal particles to obtain mixed particles, the melting point of the metal particles being lower than the decomposition temperature of the titanium hydride; Apply pressure to the particles to make the metal particles and the titanium hydride particles composite to form a block composite; mechanically crush the block composite to obtain composite particles; and perform particle size screening on the composite particles to screen out The metal phase coats the composite particles of the titanium hydride phase. The invention also provides a preparation method of foamed aluminum.
Owner:TSINGHUA UNIV +1
Ceramic-based composite material thread machining method
The invention relates to a thread machining method, in particular to a ceramic-based composite thread machining method. The technical problems that an existing ceramic-based composite material thread machining method is poor in thread quality, poor in thread machining quality stability, short in thread service life and the like are solved. The thread machining method comprises the following steps: 1) weighing rosin, alum and boron carbide powder according to a certain mass ratio; 2) adding the rosin and the alum into a container, heating until the rosin and the alum are completely melted, then adding the boron nitride powder, and heating until a viscous glue solution is formed; (3) the ceramic-based composite part is polished, cleaned and dried; (4) the to-be-machined thread part is coated with a glue solution; (5) thread machining is conducted after the glue solution is cured; (6) the ceramic-based composite part obtained after thread machining is completed is subjected to high-temperature treatment, and the glue solution is removed; and (7) silicon carbide coating deposition is conducted on the surface of the ceramic-based composite part, and the completely-machined ceramic-based composite part is obtained.
Owner:XIAN XINGUI CERAMIC COMPOSITE MATERIAL CO LTD
High-energy X-ray industrial CT ionization detector
InactiveCN101526623BIncrease conversion rateReduce manufacturing costX/gamma/cosmic radiation measurmentLattenSignal processing circuits
The invention provides a high-energy X-ray industrial CT ionization detector, which can overcome the defects of scintillator detectors and is suitable for radiation detection of a high-energy X-ray industrial CT system. The detector comprises seal housing which is filled with working gases and is provided with a plurality of ionization chamber units; the ionization chamber unit is elongated and comprises a U-shaped ionization chamber wall and a latten; a receiving terminal of the X-ray on the latten is fixedly arranged at an open end of the U-shaped ionization chamber wall via an insulation sheet; the other end of the latten is arranged in the ionization chamber and spread along the length direction of the ionization chamber; the latten, with thickness less than or equal to 0.3mm, is manufactured by high-density metals with high atomic number or the alloy of the metals; a coat on which secondary electrons are easily generated covers the external surface of the latten; the U-shaped ionization chamber wall is connected with a signal processing circuit as a collector; the latten is connected with a high-voltage cathode and a high-voltage power supply as a radiation converter.
Owner:CHONGQING UNIV
A Method for Improving the Density of Parallel Arrays of Carbon Nanotubes Using Elastic Material Poisson's Ratio
The invention discloses a method for increasing the density of parallel arrays of carbon nanotubes by means of the Poisson's ratio of an elastic material. First, the parallel array of carbon nanotubes grown on the substrate is transferred to elastic materials, such as polymethyl methacrylate, silicone rubber or polyester, and other elastic materials; then stretch the carbon nanotubes along the direction of extension. The elastic material makes it shrink in the direction perpendicular to the extension of carbon nanotubes, thereby obtaining high-density carbon nanotubes; finally, the parallel array of carbon nanotubes on the film is transferred to the target substrate. The method of the invention is simple and practical, high in efficiency and low in cost, and can produce high-density and high-quality parallel arrays of pure semiconductor carbon nanotubes.
Owner:PEKING UNIV
Preparation method of milnacipran hydrochloride preparation
PendingCN114569566AImprove stabilityMedication requirementsOrganic active ingredientsNervous disorderAdhesivePharmaceutical drug
The invention relates to the technical field of medicine preparation, in particular to a preparation method of a milnacipran hydrochloride preparation. Aiming at the defects in the production process of the existing milnacipran hydrochloride preparation, the preparation method of the milnacipran hydrochloride preparation comprises the following steps: crushing milnacipran hydrochloride; the preparation method comprises the following steps: taking milnacipran hydrochloride, adding a flow aid, a part of filler, an adhesive and / or a disintegrating agent, mixing, crushing, dispersing and sieving; the dosage of the filling agent is 0-2 times of the total weight of milnacipran hydrochloride, the flow aid and the adhesive and / or disintegrating agent; taking the residual filling agent, and sieving; if the adhesive or the disintegrating agent is not added in the step, the adhesive or the disintegrating agent is taken and sieved; uniformly mixing the sieved powder; uniformly mixing lubricant powder; and molding to obtain the core material. And coating the core material. The method is low in cost, and the prepared milnacipran hydrochloride preparation is good in stability and high in applicability to raw materials of different batches and manufacturers.
Owner:SICHUAN CREDIT PHARMA +1
Preparation method of niobium pentoxide with small tap density
ActiveCN114180626AUniform particle size distributionReduce reunionNiobium compounds preparationPhysical chemistryNiobium oxide
The invention discloses a preparation method of niobium pentoxide with small shaking density. The preparation method comprises the following steps: secondary neutralization, precipitate washing, drying, calcining and grinding and screening. According to the preparation method disclosed by the invention, by adjusting and optimizing process conditions, on one hand, the particle size distribution of the prepared niobium oxide real particles is uniform, so that the agglomeration of the real particles is reduced; on the other hand, the aggregation of the real particles is reduced by diluting the fluoroniobic acid (H2Nb7) to a certain concentration before neutralization and precipitation, controlling the neutralization time and controlling the washing conditions, and the aggregation effect of the real particles is reduced by changing a screen mesh from 60 meshes to 80 meshes during screening, so that the generation of the granularity of false particles is reduced, and the requirement of reducing the density is met.
Owner:江门富祥电子材料有限公司
Method for producing synthetic quartz material for semiconductor mask
PendingCN114735927AImprove Optical UniformityGood process repeatabilityGlass shaping apparatusGlass productionPhysicsVapor phase
The invention relates to a method for producing a synthetic quartz material for a semiconductor mask plate. The method comprises the following steps: (1) depositing a silicon source on a guide rod by adopting a vapor phase axial deposition method to obtain a low-density SiO2 loose body; wherein in the deposition process, the interior of the deposition cavity is controlled to be in a negative pressure environment, and the temperature is not higher than 500 DEG C; (2) transferring the low-density SiO2 loose body into a sintering furnace, and heating to 1100-1300 DEG C in a closed environment filled with dehydroxylation airflow and oxygen so as to dehydrate the low-density SiO2 loose body; (3) in an inert gas environment, introducing fluorine-containing gas into the sintering furnace, and heating to 1400-1600 DEG C, so that the low-density SiO2 loose body is vitrified to form transparent quartz glass; in the dehydration and vitrification process, the low-density SiO2 loose body is kept not moving in the longitudinal direction, and the longitudinal and radial temperature gradient in the deposition cavity is smaller than or equal to 2 DEG C; and (4) annealing the transparent quartz glass to obtain the synthetic quartz material. According to the method disclosed by the invention, the continuity of the production process is high, and T170-193nm of the synthesized quartz product is greater than or equal to 95%.
Owner:江苏亨芯石英科技有限公司
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