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83results about How to "Broaden the field of study" patented technology
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Direct torque control system of permanent-magnet synchronous motor
InactiveCN102611381AEmbody practicalityBroaden the field of studyElectronic commutation motor controlVector control systemsVoltage vectorSynchronous motor
The invention relates to a direct torque control system of a permanent-magnet synchronous motor. According to the control system, an extended kalman filter (EKF) observer is adopted for stator magnetic linkage and rotation speed estimation, according to a mathematical model of the permanent-magnet synchronous motor, the state variable x of the system equals to [Psi alpha, Psi beta, Omega gamma, Theta gamma] T, the input variable mu equals to [mu alpha, mu beta] T, the output variable y equals to [Iota alpha, Iota beta ] T, and state equations and output equations (11) of the system are obtained. The motor rotating speed is used as the input of an automatic data rate changer (ADRC) speed controller, the measurement value Te of the electromagnetic torque is calculated through the obtained stator magnetic linkage, in addition, the measurement value Te and electromagnetic torque given signals are compared, comparison results are used as the input of a space voltage vector pulse generator, and the output of the space voltage vector pulse generator is connected with a voltage source inverter of the permanent-magnet synchronous motor. The direct torque control system has the advantages of good dynamic performance, better stability performance, high robustness and high anti-interference capability.
Owner:ZHEJIANG UNIV OF TECH
Soft manipulator based on pneumatic artificial muscles
Owner:ZHEJIANG SCI-TECH UNIV
Compressive sensing-based adaptive video information hiding method
InactiveCN102917227AOrnamental effectSmall amount of calculationTelevision systemsDigital video signal modificationPattern recognitionKey frame
The invention discloses a compressive sensing-based adaptive video information hiding method, which is characterized by comprising the following steps of: a, framing a video file by using shot as a unit; b, taking the first frame of each shot as a key frame; c, establishing an image texture classification model to obtain a texture classification model mark of each key frame; d, determining a texture category of each key frame and determining whether the key frame is a texture region, or a smooth region or between the texture region and the smooth region; e, selecting an algorithm and determining insert depth; f, inserting secret information, i.e., inserting the secret information in a coefficient matrix; and g, synthesizing a video file. According to the video information hiding method, the secret information can be adaptively inserted under the condition that the entire video file is not required to be decompressed, so that the ornamental value of the video is not affected, and the method has the advantages of small amount of calculation, high information steganography efficiency, small influence on the video and good secret information safety. The method can be widely applied to various fields such as copyright authentication, pirate tracking and secure communication.
Owner:SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
Six-degree-of-freedom flexible mechanical arm based on pneumatic muscles
InactiveCN101817181ANovel structureSimple structureProgramme-controlled manipulatorMuscle workRobotic arm
The invention discloses a six-degree-of-freedom flexible mechanical arm driven by pneumatic muscles, which mainly comprises a mechanical arm fixing platform, a shoulder joint, a shoulder joint drive, an elbow joint, an elbow joint drive, a wrist joint and a wrist joint drive, wherein the shoulder joint drive is arranged on the mechanical arm fixing platform, the pneumatic muscles are connected in parallel to drive a shaft and a rotor so as to realize te shoulder joint rotates around an Y shaft and a Z shaft, the elbow joint adopts a Hooke joint mechanism, four muscles work in parallel to realize the elbow joint rotates around the Z shaft and the Y shaft, the wrist joint adopts a Hooke joint mechanism, and four muscles work in parallel to realize the wrist joint rotates around the Z shaft and the Y shaft. The invention solves the use defects of the present mechanical arm, has the advantages of novel and simple structure, easy control, flexibility, strong bearing capacity, high precision, no accumulated error, quick response, large rigidity and dynamic property, and the like, and has very high value in use in dangerous working environment by controlling the mechanical arm remotely.
Owner:ZHEJIANG SCI-TECH UNIV
Compound potassium lead borophosphate nonlinear optical crystal as well as preparation method and application thereof
InactiveCN101876772AHigh birefringenceBroaden the field of studyPolycrystalline material growthFrom frozen solutionsNonlinear optical crystalPhosphate
The invention relates to a compound potassium lead borophosphate nonlinear optical crystal as well as a preparation method and application thereof. The compound has the chemical formula of KPbBP2O8. The preparation method comprises the following steps of: after uniformly mixing a raw material containing K, Pb, B and P by adopting a solid-phase reaction method, heating for carrying out solid-phase reaction to obtain a compound of the potassium lead borophosphate; and growing a crystal on the compound by adopting a melt method to obtain the potassium lead borophosphate nonlinear optical crystal. The compound is the centimeter-grade large size nonlinear optical crystal of a tetragonal crystal system; a space group is I-42d; cell parameters comprise a=7.1764(7), b=7.1764(7), c=13.9483(13), Z=4 and V=718.35; the powder frequency doubling effect of the compound is equivalent to that of KDP (Potassium Dihydrogen Phosphate); the Mohs hardness is 4 to 5; and the potassium lead borophosphate nonlinear optical crystal has the advantages of easy cutting, polishing processing and storage, no deliquescence, high preparation speed, simple operation, low cost, good mechanical performance, difficult cracking, stable physicochemical property, and the like and is suitable for manufacturing an nonlinear optical device.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
Platinum diselenide crystal material and preparation method thereof
ActiveCN104233214ABroaden the field of studyImprove electronic propertiesVacuum evaporation coatingSputtering coatingTitanium diselenideSe element
The invention discloses a platinum diselenide crystal material and a preparation method thereof. The preparation method comprises the following steps: 1) under a vacuum environment, evaporating and depositing a proper amount of high purity selenium on a metal platinum substrate; and 2) carrying out an annealing treatment, so that selenium atoms covering the surface of the substrate and platinum atoms on the substrate interact to form a two-dimensional ordered crystalline state membrane structure in a sandwich arrangement of selenium-platinum-selenium so as to obtain the platinum diselenide crystal material. The inorganic two-dimensional crystalline state material is a new member of a transitional metal disulfide compound family, expands the field of research on non-carbon based two-dimensional crystal materials, and has a wide application potential in future information electronics and apparatus development and research. According to the method disclosed by the invention, the platinum diselenide two-dimensional crystalline state material with a big area and a high quality is grown on a molecular beam epitaxial method, so that the electronic properties of the platinum diselenide crystalline state material and related applications and development are favorably researched.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI
Preparation method of WO3/ZnWO4 composite micro-nano fiber and product of WO3/ZnWO4 composite micro-nano fiber
InactiveCN107299417AAchieve surface modificationImprove dispersion stabilityMaterial nanotechnologyInorganic material artificial filamentsMicro nanoFiber
The invention discloses a preparation method of WO3 / ZnWO4 composite micro-nano fiber. The preparation method comprises the following steps: firstly, preparing Zif-8 from zinc salt and dimethyl imidazole which serve as a raw material; then adding polyethylene glycol 200 and formamide to prepare a Tris-HCl solution of the Zif-8; dissolving tungstic acid in ammonia water, so as to obtain a solution; slowly dropwise adding the two solutions into a polyvinylpyrrolidone (PVP) solution, so as to obtain a precursor spinning solution, and performing electrostatic spinning and thermal treatment, so as to obtain a final product. According to the WO3 / ZnWO4 composite micro-nano fiber produced through the preparation method, a fiber main body is formed by compounding WO3 and ZnWO4 nano particles, and WO3 heterogeneous phase particles are generated on the surface. A metal organic framework material (Zif-8) is introduced into a synthesis process of the WO3 fiber, so that the preparation process is simple and convenient, high in reaction controllability and high in operability; a crystal phase structure and a microstructure of the product are adjustable, and the product has high repetitiveness. The WO3 / ZnWO4 composite micro-nano fiber obtained through the preparation method has an important market application prospect on the aspects of gas sensitivity, catalysis and the like.
Owner:UNIV OF JINAN
Thermal activation delayed fluorescence material based on dibenzophenazine derivative as well as preparation method and application of thermal activation delayed fluorescence material
ActiveCN111574514AEfficient use ofEfficient transferOrganic chemistrySolid-state devicesQuantum yieldElectron donor
The invention discloses a thermal activation delayed fluorescence material based on a dibenzophenazine derivative as well as a preparation method and application of the thermal activation delayed fluorescence material, and belongs to the technical field of organic photoelectric materials and devices. The structural formula of the material is shown as a formula (I), in the formula (I), R1 is phenoxazinyl, phenothiazinyl or dimethyl acridinyl, R1' is phenoxazinyl, phenothiazinyl or dimethyl acridinyl, R1 '' is phenoxazinyl, phenothiazinyl or dimethyl acridinyl, and R2 is H, phenoxazinyl, phenothiazinyl or dimethyl acridinyl. The material provided by the invention has the advantages that the electron acceptor and the electron donor unit show a highly distorted rigid structure, 100% theoretical internal quantum efficiency can be realized, the fluorescence quantum yield is high, a guarantee is provided for a high-efficiency long-waveband OLED device, and the like. And a polysubstitution mode is adopted, so that red shift of molecular emission wavelength is facilitated, long-waveband luminescence is realized, and a guarantee is provided for an efficient long-waveband OLED device.
Owner:山西穿越光电科技有限责任公司
Electrolyte for lithium secondary battery and lithium-oxygen secondary battery
ActiveCN107221704AGood reversibilityBroaden the field of studyFuel and secondary cellsCell seperators/membranes/diaphragms/spacersLithium hydroxideSilanes
The invention provides an electrolyte for a lithium secondary battery, the electrolyte includes a material which can be reacted with a corrosion matter on the surface of a negative electrode of the lithium secondary battery to form a silicon-containing protection layer, and the lithium secondary battery includes a lithium-oxygen secondary battery or a lithium-sulfur battery. According to the characteristic that corrosion matter lithium hydroxide is formed inevitably on the lithium surface of the lithium secondary battery of the opening system, a silicate material and / or silane material are / is added in the electrolyte, and the silicate material and / or the silane material are / is easy to react with the lithium hydroxide to form a silicon-containing protection film, further erosion of the lithium negative electrode can be effectively prevented, and with the charge and discharge, silicate / silane in the electrolyte can dynamically repair of the protective film, namely, growth of the protection film is continued on the corroded lithium surface, in the circulating charge and discharge process, the lithium negative electrode can be dynamically protected in real time in situ, the effect is better, the protective layer is more compact, metal lithium corrosion can be effectively reduced, and the metal lithium reversibility can be significantly improved.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Pyrimidotriazole compounds containing hydrazone bonds as well as preparation method and application of pyrimidotriazole compounds
InactiveCN106432247AEnhanced inhibitory effectSignificant in vitro antitumor activityOrganic chemistryAntineoplastic agentsHydrazoneDrugs preparations
The invention belongs to the field of medicinal chemistry and discloses pyrimidotriazole compounds containing hydrazine bonds as well as a preparation method and an application of the pyrimidotriazole compounds in drug preparation. The general formula I of the compounds is shown in the specification. The compounds have remarkable inhibition and killing functions on multiple tumor cells such as MGC-803, MCF-7 and EC-109, can serve as candidate or lead compounds for further development and are applied to preparation of an anti-tumor drug.
Owner:ZHENGZHOU UNIV
Position reversal solution control method of six-freedom cascade mechanical arm
ActiveCN102609002ABroaden the field of studyPractical methodPosition/direction controlDegrees of freedomEngineering
The invention discloses a position reversal solution control method of a six-freedom cascade mechanical arm. Characteristics of rotation and translation of a three-dimensional object can be expressed by using a dual quaternion, all rotational joints of the six-freedom cascade mechanical arm are expressed by using the dual quaternion through conversion, a conversion relationship of the rotational joints and the dual quaternion of the six-freedom cascade mechanical arm is determined, and an equation is determined by using links among rotational joints for solving a reversal solution. The position reversal solution control method of the six-freedom cascade mechanical arm has the advantages of better instantaneity and high accuracy.
Owner:ZHEJIANG UNIV OF TECH
Simultaneous stimulating and recording system of cross sensory channels of sight, sound and body sense
InactiveCN102172327AAdjust stimulus parameters arbitrarilySolving the problem of joint presentation of stimuliDiagnostic recording/measuringSensorsSomatosensory systemEngineering
The invention relate to a simultaneous stimulating and recording system of cross sensory channels of sight, sound and body sense, comprising a stimulus control host, an audio-visual stimulus device, an electroencephalogram (EEG) signal filter amplifier and a digital EEG signal recording device, wherein, the stimulus control host is connected with the audio-visual stimulus device; the audio-visual stimulus device is connected with the EEG signal filter amplifier through a testee; and the output end of the EEG signal filter amplifier is connected with the digital EEG signal recording device. The main technical characteristics are as follows: the audio-visual stimulus device is connected with the triggering signal input ends of two body sense stimulators and the marking signal input ends of the EEG signal filter amplifier through a marking signal distributor; and the output ends of the two body sense stimulators are connected with the EEG signal filter amplifier through a testee. By utilizing the system, the function of inducing and recording the stimulus of three sensory channels is realized in a programming manner, and the problem that the prior art can realize the united presentation of the stimulus of only two sensory channels is solved and the research field of (evoked potentials) ERPs is broadened.
Owner:INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
Scalable force and electric field transmission electron microscope in situ sample rod
InactiveCN106057618AReduce difficultyReduce the difficulty of operationElectric discharge tubesElectricityConventional transmission electron microscope
The invention provides a scalable force and electric field transmission electron microscope in situ sample rod which comprises a coarse adjusting device, a signal adapter, a sample rod shell, a coarse adjustment adapter, a switching fixed rod, a coaxial ring, a transmission rod, a piezoelectric ceramic holder, a sample rod head, a piezoelectric ceramic tube, a fixed part, a needle fixed device, a conductive needle tube, a conductive electrode, a nano tip and a test electrode. Test and the control signal lines are inserted into the signal adapter, the electrical control connection of an external control testing module and the piezoelectric ceramic tube, the nano tip and a sample is realized. After the sample rod is inserted into a transmission electron microscope, the coarse adjusting device is controlled to accurately move the nano tip to the fine adjustment range of the sample, through adjusting the driving signal of the external control testing module, the in situ deformation of the piezoelectric ceramic tube is controlled, thus the nano tip is controlled to accurately move in a nano level in a fine adjustment range, finally the mechanical and optical contact of the nano tip and a testing sample is realized, and a force and electric performance in situ experiment is completed.
Owner:LANZHOU UNIVERSITY
Preparation method and application of cobaltosic oxide/graphene aerogel composite material
ActiveCN104986808AEasy to prepareImprove conductivityMaterial analysis by observing effect on chemical indicatorColor/spectral properties measurementsElectronic transmissionCobalt(II,III) oxide
The invention provides a preparation method and application of a cobaltosic oxide / graphene aerogel composite material. The cobaltosic oxide / graphene aerogel composite material can be used in the field of colorimetric method based detection, especially used for colorimetric method based acetyl choline detection. A water solution prepared by oxidized graphene and soluble cobalt salt is transferred into a cylindrical container, then the cylindrical container is moved into a polytetrafluoroethylene hydrothermal kettle to perform constant-temperature thermal reaction, a drying technology is adopted to prepare the cobaltosic oxide / graphene aerogel composite material, and the preparation method is simple. The prepared cobaltosic oxide / graphene aerogel composite material has excellent conductivity, good electronic transmission performance and large localization range, and catalytic effect is remarkably improved. The prepared cobaltosic oxide / graphene aerogel composite material is creatively applied to colorimetric method based acetyl choline detection, operation is simple and convenient, the used instruments are low in price, and the research field of graphene aerogel based materials is widened.
Owner:JIANGSU UNIV
Lightning stroke flashover early warning method and system based on historical information
ActiveCN106651031AThe warning result is accurateBroaden the field of studyForecastingICT adaptationLightning strokesNeighbor algorithm
The present invention discloses a lightning stroke flashover early warning method and system based on historical information. The method comprises: collecting the historical information of the lightning stroke, dividing the historical information of the lightning stroke into a lightning stroke flashover and non-flashover of the lightning stroke, and constructing a KD tree according to the historical information of the lightning stroke; when the lightning stroke happens, obtaining the lightning stroke information to be subjected to early warning through the real-time monitoring of an atmospheric electric field and the like, and employing the KD tree nearest neighbor search algorithm to search K neighbor points of the lightning stroke information to be subjected to early warning; and finally determining the category of the information to be subjected to early warning through adoption of the K neighbor algorithm to output an early warning result. The early warning result through the method provided by the invention is more accurate.
Owner:SHANDONG UNIV
Compound lead rubidium borophosphate and non-linear optical crystal of lead rubidium borophosphate, preparation method and applications thereof
ActiveCN103628136AHigh birefringenceBroaden the field of studyPolycrystalline material growthBy pulling from meltTetragonal crystal systemChemical property
The invention relates to a compound lead rubidium borophosphate and a non-linear optical crystal of lead rubidium borophosphate, a preparation method and applications thereof. The chemical formula of the lead rubidium borophosphate is RbPbBP2O8, and the compound is prepared by adopting a solid phase reaction method. The chemical formula of the non-linear optical crystal of lead rubidium borophosphate is RbPbBP2O8, the crystal belongs to a tetragonal crystal system, the space group of the crystal is I-42d, the lattice parameter is Z=4, the powder frequency-doubling effect is 1.1 times that of KDP(KH2PO4), and ultraviolet light penetrating waveband cutoff edge is less than 240 nm. The preparation of the crystal has the advantages of simple operation and low cost, and the reagents are all inorganic substances, and the crystal has the advantages of low toxicity, short growth period, and stable physical and chemical properties. The crystal is suitable for manufacturing non-linear optical devices, and is widely applied to non-linear optical devices such as frequency doubling conversion, optical parametrical oscillator, and the like.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
Serum-free separating and culturing method for sheep embryo stem cell
InactiveCN101914487ABroaden the field of studySignificant technological progressEmbryonic cellsGerm cellsSerum freeStem cell culture
The invention provides a serum-free separating and culturing method for a sheep embryo stem cell, comprising the following steps of: removing a zona pellucida of sheep blastula cultured in vitro with a Tyrode's Solution and then inoculating the sheep blastula to a serum-free culture solution of the sheep embryo stem cell and fixing by using a needle head; placing under the conditions that the temperature is 38.6DEG C and the saturated humidity is 5 percent CO2 for culturing; during the culturing, replacing the culture solution in a half quantity every 48 hours with the pH value of 6.8-7.2 and primarily culturing for 7-9 days; and carrying out the transfer culture once according to the ratio of 1:2-1:4 by adopting a conventional mechanical method, that is to say, transferring the sheep embryo stem cell cultured in vitro to the 16th generation. The serum-free culture solution of the sheep embryo stem cell is prepared from D-MEM / F-12+80ng / mL bFGF+3muMCHIR 99021+10mu L / mL N2+20mu L / mL B27+10mu L / mL NEAA+2mM L-Glutamine+0.2mM beta-Mercaptoethanol. Bared embryos are fixed at the bottom of a culture dish by using a No.32 needle head so as to avoid the damage to the cells in the blastula, and a baked embryo trophocyte is stripped off. The preferable inoculating amount of the baked embryos is 45-60 / groups. The method can ensure that the formation rate of primary colony of sheep embryo stem cells is improved to 33 percent (14 / 42).
Owner:新疆维吾尔自治区畜牧科学院中国-澳大利亚绵羊育种研究中心
Bifluorescence-emission organic light-emitting material and preparation method thereof
InactiveCN103409134AImprove solubilityEnhance electron pulling effectOrganic chemistryLuminescent compositionsBenzoic acidAryl
The invention discloses a bifluorescence-emission organic light-emitting material and a preparation method thereof. According to the bifluorescence-emission organic light-emitting material, three substitution aryl vinyl constitutional units are introduced to the 2-, 4- and 5- bits of an imidazole ring to form an imidazole organic light-emitting macromolecule comprising nitro and three-aryl vinyl. The preparation method of the bifluorescence-emission organic light-emitting material comprises the following steps: (1) synthesis of the intermediate: 4,4'-(3,4-dioxo-1,5-hexadiene-1,6-di-group) di-benzoic acid di-methyl ester; (2) synthesis of 4,4'-(2,2'-(2-(4-nitrobenzene vinyl)-1H-imidazole-4,5-di-group)) double(ethylene-2,1--di-group) di-benzoic acid di-methyl ester. The compound, disclosed by the invention, shows the bifluorescence emission characteristics in the tetrahydrofuran solution, the fluorescence spectrum of the compound nearly covers the entire visible region, and the compound emits strong yellow fluorescence. The preparation method is simple to operate, convenient to synthesize and easy to purify, has potential application value in the fields of fluorescence sensitivity and the like, and can be used for luminescent devices. The bifluorescence-emission organic light-emitting material and the preparation method expand the research field of three-aryl imidazole compounds.
Owner:TAISHAN UNIV
Congested road section modeling and evaluation method based on complex network
ActiveCN109859480AEasy to studyBroaden the field of studyDetection of traffic movementTraffic networkRoad networks
The invention relates to a congested road section modeling and evaluation method based on complex network. In the method, aiming at a congestion phenomenon of a traffic network, innovation is executedfor the conventional traffic road network in combination with a method of the complex network, in the traffic road network with time-varying characteristics, a traffic network quantification method is optimized through user-defined weight density and neighborhood density, and traffic efficiency of the traffic network is evaluated in combination with a percolation theory and a complex network theory. In the method provided by the invention, research on the network traffic can be simplified through the complex network theory, the congestion phenomenon is described visually, a topologic structure of the road network is analyzed deeply and traffic flow property is investigated, consequently, different methods and angles of view are provided for research on the modern traffic road network; bycombination of the percolation theory and the complex network theory, the field of research on the traffic network can be expanded, a novel method is created, theoretical foundation is provided for solving traffic problems, and a role in guidance is realized.
Owner:ZHEJIANG UNIV OF TECH
Optical fiber cladding SPR micro-bending sensor and calibration device thereof
The invention belongs to the field of optical fiber sensing, and mainly relates to an optical fiber cladding SPR micro-bending sensor and a calibration device thereof. The optical fiber cladding SPR micro-bending sensor disclosed by the invention has the advantages that the manufacturing difficulty and the manufacturing cost of the optical fiber SPR sensor are reduced; the measurement of the bending curvature through the SPR effect is innovatively proposed and verified, and the research field of the traditional optical fiber type micro-bending sensor is expanded to a certain extent. The optical fiber cladding SPR micro-bending sensor has obvious advantages in landslide disaster monitoring, the large landslide disaster frequency generation points are buried, and once tiny deformation occurson the earth surface, and the landslide intensity can be speculated by observing the depth and the displacement of the SPR resonance peak on the spectrometer, so that the landslide disaster can be monitored, and the optical fiber cladding SPR micro-bending sensor has a wide application value.
Owner:CHONGQING THREE GORGES UNIV
Formononetin derivative comprising dithiocarbamate, preparation method and application thereof to antitumor drugs
InactiveCN106674182ASolve the problem of weak anti-tumor activityImprove anti-tumor activityOrganic chemistryAntineoplastic agentsProstate cancerInhibitory effect
The invention discloses a formononetin derivative comprising dithiocarbamate, and a preparation method and application of the formononetin derivative to antitumor drugs, and belongs to the field of pharmaceutical chemistry. The mother nucleus of formononetin is combined with a dithiocarbamate active unit to simply, efficiently and greenly synthesize the formononetin derivative comprising dithiocarbamate. The general molecular formula of the formononetin derivative comprising dithiocarbamate is shown in the description. The in vitro antitumor activity test of the compound indicates that the formononetin derivative has a certain effect of inhibiting multiple tumor cells of EC-109, MGC-803 and PC-3. Compared with the natural formononetin, the anti-prostate cancer activity of the formononetin derivative I-8 comprising dithiocarbamate is improved by 28 times, so that the formononetin derivative comprising dithiocarbamate is a candidate or a lead compound for further development, and is applied to the preparation of the antitumor drugs.
Owner:ZHENGZHOU UNIV
Robot group cooperative active sensing method based on self-organized mapping
ActiveCN109799829ASimplify complexityAvoid local optimaPosition/course control in two dimensionsMathematical modelRadar
The invention discloses a multi-robot cooperative active sensing method based on self-organized mapping. The method includes the steps: performing first-round detection according to a calculated trackand a multi-traveling salesman problem model by a robot group to form a closed-loop path; selecting a robot with the lowest ratio of traveling budget time of reaching a target observation point to actual consumed time as a winning robot, performing iterative calculation on the path point of the winning robot by a self-organized mapping network algorithm to obtain a closed-loop path comprising thetarget observation point, and detecting a current target point according to the closed-loop path through a depth camera and a laser radar by the winning robot; traversing all target points and finishing detection. A robot group cooperative active sensing problem in a scene with a large amount of information is transformed into a multi-traveling salesman mathematical model for multi-objective pathplanning, and complexity of problems is greatly simplified. The robot path point is iteratively processed by the self-organized mapping neural network algorithm, and calculation complexity is low.
Owner:TSINGHUA UNIV
Multifunctional gas high-pressure in situ Raman test cell and application thereof
A multifunctional gas high-pressure in situ Raman test cell comprises an external high pressure cylinder, an internal high pressure cylinder is arranged in the external high pressure cylinder, and the front end of the internal high pressure cylinder is provided with a diaphragm; the tail end of the internal high pressure cylinder is arranged outside the external high pressure cylinder in an extension manner, and is fixedly connected with the tail end of the external high pressure cylinder through a fastener; and a high pressure gas source goes through the internal high pressure cylinder to the front end of the internal high pressure cylinder in order to press a sample to the diaphragm. The test cell can realize in situ test of the Raman spectrum of a material under high temperature, high pressure, special atmosphere, laser irradiation and other extreme conditions. The test cell can be used to test a powder, a block, a high temperature melt, a film and various forms of samples. The test cell can continuously monitor the Raman spectrum of the material in an in-situ manner in the heating, pressurizing and atmosphere changing process in order to realize continuous in-situ tracking of the structure change, the stability and the chemical reaction process of the material.
Owner:SHANDONG UNIV
Manganese dioxide doped hafnium oxide ceramic material and method of producing the same
The invention discloses a hafnium oxide ceramic material with manganese dioxide as doping and a preparation method thereof. The hafnium oxide ceramic material is composed of MnO2 with a mol ratio of 20-50% and HfO2 with a mol ratio of 50-80%. The preparation method has the following steps: 1. the MnO2 and HfO2 are respectively weighed according to the mol ratio; 2. the powder of the weighed MnO2 and HfO2 are both poured into a mortar for full grinding and mixing to obtain mixed powder; 3. the mixed powder is made into blank sheets at the pressure of 8-10 MPa by a pressure machine; 4. the blank sheets are put into a high temperature tubular furnace, and after high sintering in argon atmosphere, high sintering sheets are obtained; 5. the high sintering sheets are cooled to room temperature with the furnace, thus obtaining the finished product. In the invention, the technique is simple and clear, the operation is easy and convenient and the cost is low, meanwhile, the manufactured hafnium oxide ceramic material has fine stability and conductivity.
Owner:NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
Compound rubidium phosphomolybdate, rubidium phosphomolybdate nonlinear optical crystals, and preparation method and applications of compound rubidium phosphomolybdate and rubidium phosphomolybdate nonlinear optical crystals
ActiveCN103628135AHigh birefringenceBroaden the field of studyPolycrystalline material growthBy pulling from meltNonlinear optical crystalRubidium
The invention relates to compound rubidium phosphomolybdate, rubidium phosphomolybdate nonlinear optical crystals, and a preparation method and applications of the compound rubidium phosphomolybdate and the rubidium phosphomolybdate nonlinear optical crystals. Chemical formula of the compound rubidium phosphomolybdate is Rb4Mo5P2O22; the compound rubidium phosphomolybdate is prepared via solid phase method; chemical formula of the rubidium phosphomolybdate nonlinear optical crystals is Rb4Mo5P2O22; the rubidium phosphomolybdate nonlinear optical crystals belong to orthorhombic system; space group is C2221; cell parameter Z=4; powder frequency-doubled effect of the rubidium phosphomolybdate nonlinear optical crystals is one time of that of KDP (KH2PO4); and ultraviolet transmittance wave band cutoff wavelength is 300nm. Growth process of the rubidium phosphomolybdate nonlinear optical crystals possesses advantages such as simple operation, low cost, low toxicity, short growth cycle, and stable physico-chemical properties; and used reagents are inorganic reagents. The rubidium phosphomolybdate nonlinear optical crystals are suitable for preparation of nonlinear optical elements, and can be widely used in the nonlinear optical elements such as double frequency conventors and optical parametric oscillators.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
Compound cesium phosphomolybdate, cesium phosphomolybdate nonlinear optical crystals, and preparation method and applications of compound cesium phosphomolybdate and cesium phosphomolybdate nonlinear optical crystals
ActiveCN103628139AHigh birefringenceBroaden the field of studyPolycrystalline material growthPhosphorus compoundsNonlinear optical crystalDouble frequency
The invention relates to compound cesium phosphomolybdate, cesium phosphomolybdate nonlinear optical crystals, and a preparation method and applications of the compound cesium phosphomolybdate and the cesium phosphomolybdate nonlinear optical crystals. Chemical formula of the compound cesium phosphomolybdate is Cs4Mo5P2O22; chemical formula of the cesium phosphomolybdate nonlinear optical crystals is Cs4Mo5P2O22; molecular weight of the cesium phosphomolybdate nonlinear optical crystals is 1425.28; the cesium phosphomolybdate nonlinear optical crystals belong to orthorhombic system; space group is C2221; cell parameter Z=4; and powder frequency-doubled effect of the cesium phosphomolybdate nonlinear optical crystals is two times of that of KDP (KH2PO4). Growth process of the cesium phosphomolybdate nonlinear optical crystals possesses advantages such as simple operation, low cost, low toxicity, short growth cycle, and stable physico-chemical properties; and used reagents are inorganic reagents. The cesium phosphomolybdate nonlinear optical crystals can be widely used in the nonlinear optical elements such as double frequency conventors and optical parametric oscillators.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
Compressive sensing-based adaptive video information hiding method
InactiveCN102917227BOrnamental effectSmall amount of calculationDigital video signal modificationSelective content distributionPattern recognitionKey frame
Owner:SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
Low-temperature stretchable flexible stress sensor based on 3D printing and preparation method
PendingCN113514176AImprove tensile propertiesHigh sensitivityForce measurementEngineeringConductive materials
The invention discloses a low-temperature stretchable flexible stress sensor based on 3D printing and a preparation method thereof, and the method comprises the steps: 1, mixing CNTs and Ag powder, and obtaining a composite conductive material with a zero temperature coefficient; 2, preparing a flexible substrate; 3, coating the flexible substrate prepared in the step 2 with the composite conductive substance obtained in the step 1, and leading out an electrode to obtain a semi-finished product of the low-temperature stretchable flexible stress sensor; and 4, packaging the semi-finished product of the low-temperature stretchable flexible stress sensor obtained in the step 3 to obtain the low-temperature stretchable flexible stress sensor based on 3D printing. According to the method, the tensile property of the flexible stress sensor is greatly improved, and the flexible stress sensor is high in stability, wide in working range, low in cost, simple in process, safer and more environmentally friendly. The prepared sensor has the advantages of being high in stretchability, good in stability and high in sensitivity in a low-temperature environment below zero, and the application field of the flexible stress sensor is greatly widened.
Owner:SHANGHAI MARITIME UNIVERSITY
(S)-1-(1-phenethyl)thiourea unilateral-modified Fe-Anderson-type heteropoly acid catalyst, preparation method and application thereof
InactiveCN106475139ABroaden the field of studyHigh catalytic activityOrganic-compounds/hydrides/coordination-complexes catalystsMetal/metal-oxides/metal-hydroxide catalystsThioureaHeteropoly acid
The invention discloses a (S)-1-(1-phenethyl)thiourea unilateral-modified Fe-Anderson-type heteropoly acid catalyst, a preparation method and an application thereof. According to the invention, ammonium molybdate and ferric sulfate are reacted to generate Fe-Anderson-type heteropoly acid; then heteropoly acid is reacted under backflow condition to obtain amino unilateral-modified Fe-Anderson-type polyoxometallate; (S)-1-(1-phenethyl)isorhodanate is synthesized; and finally, polyoxometallate and (S)-1-(1-phenethyl)isorhodanate are subjected to a reaction to obtain the target product. The preparation method of the catalyst is simple, the catalyst can be used for a self-oxidation coupling reaction of an aryl methylamine compound; and the catalyst has the characteristics of environment pollution and high efficiency, mild reaction condition, environment friendlessness, and easy recovery and utilization.
Owner:SHANGHAI INST OF TECH
Dried blood spot carrier material for desorbing electrospray ionization mass spectrum, and application thereof
ActiveCN110441102AHigh strengthReduce adsorptionPreparing sample for investigationMaterial analysis by electric/magnetic meansIonizationMass spectrum analysis
The invention discloses a dried blood spot carrier material for desorbing an electrospray ionization mass spectrum, and an application thereof in phospholipidomics; the dried blood spot carrier material is composed of a glass sheet and PARAFILM fixed on the glass sheet, and a sample application slot is formed in the PARAFILM. Since the PARAFILM is made of a non-cellulose base material, and the adsorption on compounds is weaker than that of a cellulose base material, so that the compounds can be desorbed more efficiently; in addition, the constituents of PARAFILM are very difficult to be ionized under the action of electrospray and are unlikely to bring impurity signals to the carrier material itself in mass spectrometry; and the sample application slot can prevent a blood sample from spreading on the one hand to improve the strength of the compounds, and can fix the blood spot on the other hand. By adopting the dried blood spot carrier material disclosed by the invention, the technicaldefects of the non-cellulose base material for DBSS in the DESI-MS analysis are solved, and it is possible to expand the research field of DBSS DESI-MS.
Owner:SUN YAT SEN UNIV
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