83results about How to "Broaden the field of study" patented technology

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.

The invention discloses a soft manipulator based on pneumatic artificial muscles,which comprises a manipulator mechanism and an air circuit control system. The manipulator mechanism comprises a manipulator fixing platform, an elbow joint, a manipulator lower arm, a manipulator upper arm and a wrist joint; the air circuit control system comprises an air source device, pneumatic triple pieces, a pressure-reducing valve, a proportional pressure valve, an electromagnetic valve, a pneumatic artificial muscle, a data collecting card and a computer. The pneumatic muscle actuator based soft manipulator researches and develops a pneumatic muscle manipulator based on the working characteristics of a human arm structure and the pneumatic artificial muscle, uses the flexibility advantage of the pneumatic artificial muscle to solve a plurality of weaknesses of the modern robot, researches and develops a humanized manipulator mechanism and a corresponding air circuit control system, and adopts the pneumatic artificial muscle as a driver to widen the research field of the manipulator. The soft manipulator based on pneumatic artificial muscle has the advantages of novelty, flexibility, simple structure and easy controlling and the like, and can meet the requirements on the manipulator properties in the field of bionic robots and rehabilitant robots and the like.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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).

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.

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.

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.

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.

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.

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.

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.

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.