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357results about How to "The method is simple" patented technology

Pulse vortexing defect quantitative detection method and detection system

The invention discloses a pulse vortexing defect quantitative detection method and a detection system. The detection method mainly comprises the followings steps of: step 1, obtaining a relation curve algebraic expression of a time domain signal difference peak value among response signals and surface defect depth or width or a relation curve algebraic expression of a frequency domain signal fundamental frequency difference peak value among the response signals and the surface defect depth or width under the condition with known defect depth or width of a tested piece; and step 2, carrying out quantitative evaluation on the defect depth or width of the tested piece, thus obtaining a time domain signal curve or a frequency domain signal curve of a test signal, and further obtaining a time domain signal difference peak value or a frequency domain signal fundamental frequency difference peak value between the test signal and a reference signal, and then substituting the time domain signal difference peak value or the frequency domain signal fundamental frequency difference peak value to the curve algebraic expression obtained in the step 1, thus finally obtaining the defect depth or width. The detection method and the detection system provided by the invention can detect the existence of a defect by solving the relation between signals through differential operation, and also can quantitatively obtain the defect depth or width, are simple, and are easy to operate.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

Direct-writing forming method of precursor conversion ceramic

The invention belongs to forming range of three-dimensional structure, and particularly relates to a direct-writing forming method of printing and converting a precursor into ceramic. The method includes: using a ceramic precursor as a solute, dissolving the ceramic precursor in liquid-state organic matter, stirring raw materials to obtain ink with certain viscoelasticity, and putting the ink intoa needle cylinder; through an air pressure controller and according to a set program, printing out a three-dimensional structure on a substrate layer by layer, and carrying out precursor conversion to obtain ceramic with a complex three-dimensional structure. The direct-writing forming method overcomes the defect that existing direct-writing forming ceramic suspensions are prone to nozzle blockage, low in continuity and unstable in slurry in the process of forming. The designed slurry is simple and reasonable in composition, high in rheological controllability and convenient for large-scale industrial application. A three-dimensional periodic structure prepared by the method is wide in scale range, and decimeter-scale, centimeter-scale, millimeter-scale, micrometer-scale or nanometer-scale control can be realized simply through adjusting aperture of a needle head.
Owner:CENT SOUTH UNIV

Method for simultaneously measuring residue of multiple pesticides in cotton by liquid chromatography tandem mass spectrometry/mass spectrometry method

The invention relates to a method for simultaneously measuring the residue of multiple pesticides in cotton by a liquid chromatography tandem mass spectrometry/mass spectrometry method. The method comprises the steps of (1) carrying out sample treatment; (2) measuring by adopting the liquid chromatography tandem mass spectrometry/mass spectrometry method; (3) carrying out a blank test; and (4) carrying out result calculation and expression, namely calculating the contents of all the pesticides in a sample according to a formula: X=CV/m, wherein X represents the contents of all the pesticides in the sample in milligrams per kilogram, C represents the concentrations of all the pesticides in sample liquid obtained by a standard work curve in micrograms per milliliter, V represents the final volume of the sample liquid in milliliters, and m represents the sample amount of the final sample liquid in grams. The measurement method can be used for simultaneously measuring the residue of the multiple pesticides in the cotton by adopting the liquid chromatography tandem mass spectrometry/mass spectrometry method and is simple, convenient, fast, accurate and reliable; the detection limit, the recovery rate and the accuracy of the method are in accordance with the requirements.
Owner:THE INSPECTION & QUARANTINE TECH CENT ZHEJIANG ENTRY EXIT INSPECTION & QUARANTINE BUREAU

Oxygen functionalized carbon material and use thereof

The invention discloses an oxygen-functionalized carbon material and uses of the same, and belongs to the technical field of adsorbent. The invention is characterized in that the oxygen-functionalized carbon material is prepared by oxidative modification of hydrogen peroxide or ultrasonic-assisted hydrogen peroxide; the number of oxygen-containing functional groups on the surface of the carbon material after the oxidative modification of the hydrogen peroxide is obviously increased, but the pore structure and the strength of the carbon material are basically kept unchanged; the adsorption capacity of the oxygen-functionalized carbon material on metallic ions such as Ag, Cu and Cr is greatly improved compared with a raw material carbon; and when an impregnated carbon catalyst prepared by infusing the oxygen-functionalized carbon material is used for protecting cyan chloride, the protection time of the impregnated carbon catalyst is improved by 20 to 30 percent under the same preparation condition compared with the raw material carbon. The oxygen-functionalized carbon material prepared by the oxidative modification of the hydrogen peroxide or the ultrasonic-assisted hydrogen peroxide has the advantages of simple process, quickness, environmental protection, and the like, and provides an effective carbon carrier for the impregnated carbon catalyst for protecting the cyan chloride.
Owner:DALIAN UNIV OF TECH +1

Method for preparing epoxy morpholine quaternary ammonium salt-modified polybenzimidazole anion exchange membrane

The invention relates to a method for preparing an epoxy morpholine quaternary ammonium salt-modified polybenzimidazole anion exchange membrane, which comprises the steps of: at first, adding chloroepoxy propane and N-methylmorpholine to an acetonitrile solvent, controlling reaction time and temperature to obtain epoxy morpholine quaternary ammonium salt, then dissolving an amino-containing polybenzimidazole homopolymer or copolymer in an organic solvent, reacting the organic solvent with the epoxy morpholine quaternary ammonium salt to obtain epoxy morpholine quaternary ammonium salt-modified polybenzimidazole, then dissolving the epoxy morpholine quaternary ammonium salt-modified polybenzimidazole in the organic solvent, adding a diepoxy crosslinking agent to the organic solvent, and performing casting membrane forming to obtain the epoxy morpholine quaternary ammonium salt-modified polybenzimidazole anion exchange membrane with excellent properties, wherein the anion electric conductivity of the membrane can reach 0.06S/cm. The epoxy quaternary ammonium salt compound-modified polybenzimidazole crosslinking membrane has quite extensive industrial application prospect in the fields such as alkali fuel cell, water treatment, heavy metal ion recovery and the like.
Owner:SHANGHAI JIAO TONG UNIV

Rhodococcus strain C3, microbial agent containing rhodococcus strain C3, and applications of rhodococcus strain C3 and microbial agent

The invention discloses a rhodococcus strain C3. A preparation method of the rhodococcus strain C3 comprises the following steps of sucking an activated sludge sample from a wastewater biological treatment system of a coking plant to a fresh enrichment culture medium of phenol for shaking culture, wherein the inoculum concentration is 1%; after an enrichment bottle becomes muddy, taking a certain amount of the culture solution, inoculating a phenol liquid culture medium with increased concentration with the culture solution for culturing; in the same way, gradually increasing the concentration of phenol to 1000mg/L; inoculating an inorganic salt culture medium with the concentration of phenol being 1000mg/L with the strain enriched by the enrichment culture medium for domestication; and separating and screening a strain taking phenol as the unique carbon source and energy source from an isolation medium plate by adopting a dilution spread plate method and a streak plate A single colony of the strain is separated from an LB solid medium in a streaking manner, wherein the single colony is yellowish and semitransparent, has a neat edge and wet texture, and is easy to prick up; phenol, pyridine and o-cresol are taken as carbon sources, and the strain can degrade 1000mg/L of phenol in the inorganic salt liquid culture medium. The invention further provides a microbial agent taking rhodococcus strain C3 as the active component, and a preparation method of the microbial agent.
Owner:CNOOC TIANJIN CHEM RES & DESIGN INST +1

Shenqi hypoglycemic preparation HPLC standard finger print and construction method thereof

The present invention discloses a Shenqi hypoglycemic preparation HPLC standard finger print and a construction method thereof. The construction method comprises the following steps: preparing test sample solutions and a reference solution, measuring the test sample solutions and the reference solution by using the HPLC method and the linear gradient elution process, so as to obtain the Shenqi hypoglycemic preparation finger prints, wherein the chromatographic condition is that a mobile phase A is acetonitrile, a mobile phase B is 0.1% (v/v) phosphoric acid solution, the detection wavelength is 203nm, the column temperature is 25-35 DEG C and the flow rate is 0.8-1.2mL/min. The common characteristic peaks of at least ten finger prints are used as the characteristic peaks of the standard finger print; the standard finger print comprises 38 characteristic peaks, and the numbers of the characteristic peaks of saponin of ginseng stem and leaf, astragalus, Chinese magnoliaving, rehmannia root and raspberry are 13, 4, 7, 3 and 4 respectively. The Shenqi hypoglycemic preparation HPLC standard finger print and the construction method thereof can comprehensively and accurately evaluate the whole quality of the Shenqi hypoglycemic preparation, and facilitate to ensure the quality and the clinical curative effect of the Shenqi hypoglycemic preparation.
Owner:广东万年青制药股份有限公司

Preparation method of catalyst for methanol electrocatalytic reforming

The invention discloses a preparation method of a catalyst for methanol electrocatalytic reforming. The method comprises the following steps: first, dissolving a certain amount of terephthalic acid (BDC) in a mixed solution with a certain proportion of ethanol, deionized water and N,N-dimethylformamide (DMF), then dissolving CuCl2.2H2O and CoCl2.6H2O in the mixed solution, adding triethylamine (TEA), carrying out stirring for a plurality of minutes, carrying out ultrasonic treatment under a sealing condition for a plurality of hours for generating a double-metal organic framework compound of copper ions, cobalt ions and the BDC, carrying out ultrasonic centrifugation for a plurality of times, carrying out drying at room temperature to obtain a sample (marked as CoCu-BDC), mixing the samplewith carbon black according to a certain proportion, adding a certain amount of Nafion solution, and carrying out ultrasonic dispersion in a mixed solution of ethanol and water, so as to obtaining catalyst slurry finally. The CoCu-BDC prepared by the method provided by the invention is dispersed in the slurry in the form of ultra-thin nanometer sheets in the catalyst, the charge conduction capability is good, and the very high methanol electrocatalytic reforming performance is achieved. In addition, the preparation method is simple and feasible, has a short preparation time, and has a good industrial application prospect.
Owner:EAST CHINA NORMAL UNIVERSITY

Standard emission sample for environmental chamber combination property detection and its detection method

The invention relates to a standard emission sample for detecting the comprehensive performance of an environmental chamber and a detecting method thereof. The invention belongs to the indoor environment detection field; and the sample comprises a unidiameter long tube just with one open end and volatile organic compound liquid which is put into the long tube. The method comprises the following steps that: a model of the emission velocity of the volatile organic compound liquid VOC in the standard emission sample and the influence of the emission velocity on the concentration of the environmental chamber is established; parameters needed for the model are acquired; the standard emission sample is positioned in the environmental chamber to be measured; under a closed state of the environmental chamber, the VOC liquid in the tube is freely diffused; the VOC concentration in the environmental chamber is calculated and obtained by the model; the VOC concentration in an outlet of the environmental chamber is acquired by a gas chromatograph in real time; and the acquired value is compared with the VOC concentration calculated by the model so as to evaluate the comprehensive performance of the environmental chamber. The standard emission sample and the detection method are simple and easy to operate and have high precision and reliability.
Owner:TSINGHUA UNIV

Improved preparation method of polypropylene hollow fiber separation membrane

The invention relates to an improved preparation method of a polypropylene hollow fiber separation membrane. The invention belongs to the field of high-molecular material science. The method comprises the steps that: (1) polypropylene and a diluent are added into a kettle with a stirring device; heating and stirring are carried out, such that a membrane casting liquid is obtained; and when stirring is stopped, the liquid is subjected to standing and defoaming for 0.5-2h; (2) the membrane casting liquid is filtered by using a filter; an inner core liquid is introduced into a spinning nozzle, wherein a nozzle temperature is 145-165 DEG C; the inner core liquid and the membrane casting liquid are extruded by the spinning nozzle; the mixture first passes through air atmosphere, and then enters a multi-stage coagulating bath; the membrane casting liquid is cooled by the multi-stage coagulating bath, and the hollow fiber membrane is obtained by curing; (3) the hollow fiber membrane is wound by using a winding machine, and is extracted in one or a plurality of extraction agents; and (4) the extracted membrane is fetched and dried; and extraction agent is removed, such that the polypropylene hollow fiber separation membrane is obtained. With the method provided by the invention, under a same condition, a membrane flux is improved from 15/m<2>.h of one-stage water coagulating bath to higher than 1200/m<2>.h of two-stage coagulating bath.
Owner:CHINA PETROLEUM & CHEM CORP +1
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