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629results about How to "Fast response" patented technology

Double-optical frequency comb optical imaging method based on continuous frequency stabilized laser

ActiveCN104316180AFast responseAcquisition fast and highSpectrum investigationPhysicsVIT signals
The invention discloses a double-optical frequency comb optical imaging method based on a continuous frequency stabilized laser. According to the optical imaging method, two optical frequency comb seed resources are locked onto a stable outside atomic clock through a repetition frequency control module, meanwhile, an electric signal which has optical comb frequency instability is extracted through interaction between the continuous frequency stabilized laser and the laser output by the two optical frequency comb seed resources, radio-frequency signal power distribution and processing are conducted on the electric signal, a part of the electric signal is directly used for feedback control of the laser resonator character of the two optical frequency comb seed resources so as to stabilize the output carrier envelope phase frequency of a semiconductor laser unit, the other part of the electric signal is used for being mixed with a periodical interference spectrum signal generated by a double-optical comb imaging system so as to further counteract the frequency variations of the optical comb system, and therefore the measurement precision of the whole double-optical comb imaging system is controlled from two aspects and quick and super-high-resolution optical comb coherent imaging is achieved.
Owner:华东师范大学重庆研究院

Basic traffic flow parameter based automatic identification method for traffic congestion states

ActiveCN102938203AFast responseSolve problems that are difficult to judge accuratelyDetection of traffic movementTraffic volumeUnexpected events
The invention discloses a basic traffic flow parameter based automatic identification method for traffic congestion states. The method comprises the steps of determining traffic state characteristic threshold values and judging real-time traffic states, wherein firstly, characteristic threshold values of free-flowing, congestion and blockage are determined through normal fitting of the traffic flow and the occupancy phase angle tangent value, and self correction of threshold values can be conducted according to changes of traffic states; and secondly, real-time traffic states are judged through calculation of the distribution of fitted values of real-time traffic flow phase angle characteristic values according to continuous twice real-time traffic volumes. The method has the advantages that three important basic parameters of the traffic flow, such as the flow, the speed and the occupancy, serve as evidences for judgment of traffic states, the problem that traffic states of city roads at rush hours are difficult to judge correctly, and traffic conditions comprise the free-flowing state, the congestion state and the blockage state. By the aid of the method, the reaction speed for emergencies can be accelerated, and suggestions on selection of traveling routes are provided for travelers.
Owner:JIANGSU AEROSPACE DAWEI TECH CO LTD

Preparation method of bromfenac sodium

The invention relates to a preparation method of bromfenac sodium. The preparation method comprises the following steps of (a) reacting a compound represented by a formula (V) with an electrophilic substitutional reagent in the presence of N,N-dimethylformamide or dimethyl sulfoxide to obtain a compound represented by a formula (IV), (b) adding the compound represented by the formula (IV) into 2-methoxyethanol, adding phosphoric acid and carrying out acid hydrolysis to obtain a compound represented by a formula (III), (c) hydrolyzing the compound represented by the formula (III) with sodium hydroxide, extracting with dichloromethane and adding acetic acid to neutralize to obtain a compound represented by a formula (II) and (d) in the presence of an organic alcohol solvent, adding a sodium hydroxide solution, hydrolyzing the compound represented by the formula (II) to form a salt, adding the organic alcohol solvent, cooling and crystallizing to obtain bromfenac sodium. According to the preparation method disclosed by the invention, the reaction yield of the intermediate (IV) and the quality of the product are improved, high-purity bromfenac sodium can be obtained just by virtue of crystallizing with the organic alcohol solvent, the good environmental benefit is achieved and the generation of bromfenac sodium polymer impurity is reduced.
Owner:GUANGDONG XIANQIANG PHARMA +1

Packaging system of package sorting machine

The invention relates to a package sorting machine, and belongs to the field of logistics. The invention provides a packaging system of the package sorting machine. The packaging system comprises a main transmission line and a packaging transmission line of the package sorting machine, and is characterized in that the packaging transmission line comprises a package supply platform which is provided with a package supply template; the package supply template is used for confirming the locating positions of postal matters when the postal matters are supplied, the accurate positions of the postal matters to be supplied and the movement loca of the postal matters on the package supply platform; the main transmission line is provided with a main line detection and communication area; the main line detection and communication area is used for detecting the positions of trays on the main transmission line and confirming the trays to be supplied with packages; the trays to be supplied with the packages are in communication with the package supply platform by the main line detection and communication area; whether the package is supplied onto the tray or not is confirmed, and the position of the tray is adjusted; the package supply platform is used for accurately completing the package supply by adjusting the speed of movement of letters. According to the packaging system, the package supply template is used for locating, and the trays are directly in the communication with the package supply platform, so that the packaging is relatively clear and accurate; furthermore, the packaging system is rapid in response speed and higher in efficiency.
Owner:CHINA POST SCI & TECH

Method for preparing reversible addition-fragmentation chain transfer emulsion polymerization

ActiveCN101591403AShort reaction inhibition periodFast responseEmulsionChemistry
The invention discloses a method for preparing reversible addition-fragmentation chain transfer emulsion polymerization. The method comprises the following steps: adding 0.1 to 2.5 portions of amphiphilic macromolecular reversible addition-fragmentation chain transfer reagent, 20 to 40 portions of water and 1 to 20 portions of monomer by weight into a reactor, and stirring and mixing the mixture; introducing nitrogen into the reactor; heating the reactor to a temperature of between 50 and 80 DEG C; and adding 0.005 to 0.05 portion of water-soluble initiator by weight into the reactor to initiate polymerization for 0.5 to 6 hours. The method has the advantages of simple flow equipment, low energy consumption, easy removal of water system reaction heat, short reaction inhibition period, high reaction speed, high final percent conversion and good emulsion stability, and the amphiphilic macromolecular reversible addition-fragmentation chain transfer reagent can be used as a chain transfer reagent and an emulsifier without adding conventional emulsifier in addition, has actual molecular weight in accordance with a molecular weight design value and distribution of the molecular weight less than 1.4, can be synthesized into a segmented copolymer through semicontinuously adding the monomer, and has good industrial prospect.
Owner:ZHEJIANG UNIV

Large-scale preparation method of niobium pentoxide nanowires and hydrogen-sensitive element thereof

The invention discloses a large-scale preparation method of niobium pentoxide nanowires and a hydrogen-sensitive element thereof. The preparation method particularly comprises the following steps of: strictly cleaning Nb foils cut into suitable sizes, arranging the foils in a vacuum tube type furnace after a bending or folding treatment, and strictly controlling processing conditions (such as Ar flow rate, O2 flow rate, holding temperature, time and the like) of a thermal oxidation process to synthesize large-scale Nb2O5 nanowires with higher length diameter ratios. By adopting the large-scale preparation method disclosed by the invention, the large-scale synthesis of the Nb2O5 nanowires with the higher length diameter ratios can be realized in a limited-volume furnace tube, thus the production cost can be effectively reduced. Hydrogen-sensitive elements manufactured from Pt electrodes, prepared by sputtering Nb2O5 nanowires as sensitive materials, have the characteristics of small size, low energy consumption and the like, and represent higher response speed and higher sensitivity at the room temperature towards a hydrogen-containing atmosphere; and the size, the energy consumption and the production cost of hydrogen sensors can be hopefully reduced.
Owner:武汉正光恒远科技有限公司

Thermoplastic cellulose-based solid-solid phase transition material and preparation method thereof

The invention discloses a thermoplastic cellulose-based solid-solid phase transition material and a preparation method thereof. The preparation method comprises the following steps: 1, drying cellulose or a cellulose derivative; 2, respectively dissolving a cross-linking agent and polyethylene glycol alkyl ether in an organic solvent I to obtain a cross-linking agent solution and a polyethylene glycol alkyl ether solution, adding the polyethylene glycol alkyl ether to the cross-linking agent solution in a dropwise manner, adding a catalyst, and reacting for 0.5-10h to obtain a prepolymer solution, wherein a mole ratio of the polyethylene glycol alkyl ether to the cross-linking agent is 1:1; and 3, dissolving cellulose in an ionic liquid to obtain a cellulose solution, adding the prepolymer solution, acid anhydride and a catalyst to the above obtained cellulose solution, carrying out a polymerization reaction for 2-24h to obtain a finally obtained mixture, adding the finally obtained mixture to deionized water or an organic solvent II for precipitation, repeatedly washing the above obtained precipitate with deionized water 2-3 times, and carrying out vacuum drying to obtain the thermoplastic cellulose-based solid-solid phase transition material. The phase transition material has a good thermal stability and a melting processing performance, and can be blended with a thermoplastic copolymer matrix for melting processing.
Owner:TIANJIN POLYTECHNIC UNIV +1

Ultrasonic-assisted microwave controllable preparation method of Cu2ZnSnS4 nano-particles

InactiveCN103420411AFast responseAvoid expensive vacuum equipmentMaterial nanotechnologyTin compoundsQuantum dotLithium electrode
The invention relates to an ultrasonic-assisted microwave controllable preparation method of Cu2ZnSnS4 nano-particles and belongs to the field of inorganic materials. On the basis of optimizing the formula, the microwave power and the time of a reaction solution, controllable preparation of the Cu2ZnSnS4 nano-particles is realized through adjusting the ultrasonic power. As the performance of the nano-particles is greatly influenced by the shapes and the sizes of the nano-particles, the Cu2ZnSnS4 nano-particles in different shapes and sizes have different application values. The particles with the particle sizes smaller than 10 nm are Cu2ZnSnS4 quantum dots with better luminous performance, the nano-particles with bigger particle sizes can be used for preparing ink, the ink is then used for preparing a Cu2ZnSnS4 film serving as an absorbing layer of a solar cell, and the Cu2ZnSnS4 particles of which the particle sizes reach the quasi micron size can be used as an anode material of a lithium ion battery. Therefore, controllable preparation of the Cu2ZnSnS4 nano-particles is very important. The inexpensive and easy-to-implement method is adopted to successfully prepare the Cu2ZnSnS4 particles in different particle sizes and different shapes.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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