58results about How to "Efficient analysis method" patented technology

The invention discloses a vibration modeling and analyzing method of a crack impeller structure of a centrifugal compressor. The vibration modeling and analyzing method comprises the steps of firstly, providing a modeling method of a centrifugal impeller, obtaining a whole model by rotating and converting a finite element model of a section of the impeller, reducing the DOF (Degree of Freedom) of a system by adopting a hybrid interface modal synthesis method, and simulating a breath effect of a crack by defining a contact mode on a crack interface; secondly, providing a method for solving large-scale symmetrical sparse matrix-inverse matrix, and thus obviously reducing the memory space needed by calculation; finally, providing a method for carrying out statistical analysis on resonant frequency of the crack impeller structure, considering dissonant factors such as manufacturing error and state degradation which exist in an actual impeller, and obtaining statistical regularity of structure resonant frequency under a random dissonant mode. According to the vibration modeling and analyzing method disclosed by the invention, the calculating accuracy is ensured, obvious improvement effect of calculating efficiency is realized at the same time, and a high-efficiency analyzing method is provided for optimal design of the impeller and quantitative diagnosis of the crack.

The invention discloses a method for measuring main phenolic compounds in electronic cigarette liquid. The method comprises the steps of preparing a sample solution to be measured by an ultrasonic extracting method, preparing a mixed standard working solution with give concentration gradients, analyzing the solution by a high-efficient liquid-phase chromatography and a fluorescent detector, and quantizing by an external standard method. The result shows that the method is simple in preprocessing, simple to operate, short in analysis time, high in sensitivity, good in recovery rate and precision and suitable for measurement on the content of phenolic compounds in the electronic cigarette liquid.

The invention discloses a method for determination of phytic acid content of cotton seed powder. The method comprises collecting different kinds of cottonseed samples planted in different regions, carrying out sample husking, grinding, sieving and moisture balance on the samples, collecting full spectrum data, pretreating the near infrared spectroscopy data through a plurality of pretreatment methods, accurately determining sample phytic acid content through high performance ion chromatography, constructing the optimal PLS model in a full spectrum range through a full cross-validated method, carrying out variable selection on the spectroscopic data, building multiple correction models through a multivariate calibration regression method, building a near infrared spectroscopy correction model and detecting phytic acid content of cotton seed powder through the model. The method utilizes a Buchi NIR Flex-N500 Fourier transform near infrared spectrometer to acquire a spectrogram of cotton seed powder, has a fast determination speed and high accuracy, is environmentally friendly, convenient and efficient and has an important meaning for cultivation of low-phytic acid cotton and promotion of cotton side product processing and utilization.

The invention discloses a method for measuring a carbonyl compound in electronic cigarette liquid. The method comprises the following steps: preparing carbonyl compound derivative solutions at different concentration gradients by taking an acetonitrile solution of pyridine as a solvent; detecting the prepared carbonyl compound derivative solutions at different concentration gradients to obtain corresponding high-performance liquid chromatograms by utilizing high-performance liquid chromatographic instrument with an ultraviolet detector; drawing a standard working curve of carbonyl compound derivatives by taking the concentrations of the carbonyl compound derivatives in the carbonyl compound derivative solutions as the abscissa and taking the ultraviolet response integral areas of the carbonyl compound derivatives at different concentrations as the ordinate; measuring a sample solution to be measured by utilizing the high-performance liquid chromatographic instrument with the ultraviolet detector, and calculating the content of the carbonyl compound in the sample solution to be measured. The method is simple in pretreatment, convenient to operate, short in analysis time, high in sensitivity, recovery rate and precision and suitable for the measurement of the content of the carbonyl compound in the electronic cigarette liquid.

The invention discloses a method for quickly measuring harmful ingredients in main stream smoke of a cigarette. According to the method, solvent gathering and filter disc gathering are adopted on a smoking machine at the same time, carbon monoxide is detected through a non-scattering infrared detection on the smoking machine, a solvent is used for gathering ammonia, hydrogen cyanide and crotonaldehyde, a filter disc is used for gathering NNK, ammonia, hydrogen cyanide and phenol, and after being collected, samples are detected through efficient high oerformance liquid chromatography, ion chromatography and a liquid chromatogram/gas chromatograph-mass spectrometer. The method integrates six tobacco industry standard methods for harmful ingredient detection in smoke of the cigarette, operation is easy and convenient, the analysis procedure is simplified, the analysis step of repeatedly smoking the cigarette is avoided, precision is good, and the method is suitable for measuring the content of the harmful ingredients in the main stream smoke of the cigarette.

The invention discloses a method for detecting microelements in chromium powder. On an inductively coupled plasma atomic emission spectrometer, the best detection condition and the optimum detection wavelength of to-be-detected microelements are selected, and the standard work curve is obtained by detecting standard serial solutions of chromium substrates; a sample solution is detected according to the detection conditions of the standard serial solutions and the best detection wavelength of each microelement, and corresponding spectral line intensity of to-be-detected microelements in the sample solution is obtained; the content of the to-be-detected microelements in the sample solution is determined according to the acquired standard work curve and the corresponding spectral line intensity of the to-be-detected microelements in the sample solution. The content of multiple microelements in chromium powder can be measured simultaneously with the detection method; with the adoption of amatched standard work curve method of the of chromium substrates, spectral interference of the substrates with chromium as a major component to microelement determination is eliminated, influence ofa hydrochloric acid solution to the substrates is also eliminated, and the accuracy of the microelement detection result is high.

The invention relates to the technical fields of separation and analysis and particularly discloses a preparation method and application of a magnetic diethylstilbestrol molecularly-imprinted polymer based on an organic-inorganic hybridizing technology. The preparation method comprises the steps of preparing ferroferric oxide particles by using a coprecipitation method; preparing silanized ferroferric oxide by using a stober method; preparing an organic and inorganic hybrid magnetic diethylstilbestrol molecularly-imprinted polymer by using a bulk polymerization method; and grinding the polymer, sieving, adding an eluent to extract and elute, and then, drying to obtain the magnetic diethylstilbestrol molecularly-imprinted polymer. A target product, namely diethylstilbestrol, can be rapidly combined on the surface of the magnetic diethylstilbestrol molecularly-imprinted polymer synthesized by using the preparation method and can be rapidly separated from a reaction system under the action of an external magnetic field, so that the aim of efficiently separating a trace amount of diethylstilbestrol from a complex matrix at high specificity is achieved, and the sample pretreatment efficiency is greatly increased.

The invention relates to a method for detecting tripolycyanamide in an aquatic product via pressurized capillary electrochromatography, which comprises the steps of: 1) sample preparation; 2) sample pretreatment: centrifugal extraction of a sample by mixed solution of trichloroacetic acid with the mass concentration of 0.8-1.2 percent and acetonitrile at the volume ratio of (1.5-2.5):1, purification by an MCX (methoxycinnamate) solid-phase extraction column, and filtration by a filter film of 0.20-0.24mum for determination via the pressurized capillary electrochromatography; 3) preparation of standard tripolycyanamide solution; 4) analysis via the pressurized capillary electrochromatography; and 5) detection and analysis of the sample, quantitative analysis according to the retention time, and then quantitative analysis in an external marking method according to the peak area. The analytical method is efficient, accurate and highly sensitive, and the demands of drug detection of the tripolycyanamide in the daily aquatic product can be satisfied.

The invention provides a method for acquiring the logged-on user password from memory mirroring documents of a 64-bit Windows operation system. The method comprises the following steps: (a) acquiring version information of a system; (b) acquiring the value of a PEB structure variable from aCR3 register and a process environment block of lsass.exe process; (c) dumping execution samples of dynamic link library lsasrv.dll and tspkg.dll; (d) acquiring key related data; (e) acquiring user information from lsasrv.dll; (f) acquiring a login user master certificate from the tspkg.dll dumping document; and (g) acquiring the password. The method for acquiring the logged-on user password plaintext is accurate and efficient, has the analysis effect not influenced by password complexity, and is an important means for acquiring user login information from a physical memory mirroring document; and the acquired login user password is an important evidence in computer online evidence collection.

The invention discloses a GPU-based three-dimensional medical image registration similarity calculation method. An operation platform with an NVIDIA GeForce series display card is used, a thread execution kernel function is reasonably distributed, three-dimensional image gray scale information is calculated and processed through combination of a CPU and serial and parallel, regional mutual information is obtained, and similarity measurement can be conducted on three-dimensional medical image registration. Compared with a common mutual information method, more accurate evaluation data can be obtained, the processing speed is greatly increased through GPU parallel computing, and an accurate, stable and repeatable method can be provided for the three-dimensional medical image registration process.

The invention relates to restricted access poly(3-sulfopropyl methacrylate (SPM)-co-ethylene glycol dimethacrylate (EDMA)) modified silica gel chromatographic packing (Silica-g-p(SPM-co-EDMA)-g-pGMMA ([poly(glycerol monomethacrylate)]) and a preparation method thereof. The silica gel chromatographic packing is a material formed by grafting a double-layer polymer onto the surface of silica gel, and adopts poly(3-SPM-co-EDMA) as an inner layer and pGMMA as an outer layer. The expression of the silica gel chromatographic packing is Silica-g-p(SPM-co-EDMA)-g-pGMMA, wherein Silica is porous silica gel, g indicates grafting, p(SPM-co-EDMA) indicates a cross-linked polymer of 3-SPM and EDMA, and pGMMA indicates poly(glycerol monomethacrylate). The silica gel chromatographic packing can serve as a chromatographic stationary phase or a solid phase extraction material for analyzing biological samples and environmental samples, directly samples and extracts cationic compounds, and improves the analysis efficiency and accuracy. A method for measuring melamine and cyromazine in milk by online solid phase extraction/high-performance liquid chromatography coupling technology is provided and has good accuracy and reproducibility.

The invention relates to a method for controlling quality of Shenbao mixture percolating fluid, and particularly relates to a method for fast measuring the specific gravity of the Shenbao mixture percolating fluid and the content of icariin. The method comprises the following steps: step 1, measuring the near infrared spectrum and specific gravity of the percolating liquid and a standard graph and data of icariin content during the process of qualified Shenbao mixture preparation; step 2, respectively establishing corresponding models among between the percolating liquid near infrared spectrum, the specific gravity and the concentration of the icariin by using chemometrics software; step 3, measuring the near infrared spectrum of the percolating liquid to be measured during the process of Shenbao mixture preparation; and step 4, respectively obtaining the specific gravity of the percolating fluid sample to be measured and the concentration of the icariin in the Shenbao mixture preparation by utilizing the corresponding models established in the step 2 via the chemometrics software.

The invention provides a device for measuring an internal structure of coke and a measuring method thereof; the device comprises a microscope and a computer; the computer is used for controlling rotation of a polarizer of the microscope and front, rear, left, right, upper and lower three-dimensional moving of an object stage. The measuring method comprises the following steps: pretreating a to-be-tested sample for standby application; establishing the relationship between pixel values of a digital image of a substance and the reflectivity; shooting digital images for analysis of sample bireflectivity and optical anisotropic indexes; determining an effective point classification statistical rule; and analyzing an optical structure of the coke by the statistical rule. The device and the method have the advantages that compared with an image analysis method purely relying on gray and shape characteristics, the method adopts three parameters of the maximum reflectivity, the bireflectivity and the optical anisotropic indexes for identification and analysis of the optical structure, and the measured results are more accurate and more reliable; and the whole analysis process is fully automatic, and the method is a fast and efficient analysis method.

The invention discloses a method for qualitative and quantitative detection on a glycoside structured surfactant. The method comprises the following steps: step 1: separating to-be-measured substancesin a glycoside structured surfactant sample by adopting a reverse-phase chromatography; step 2, after separation, enabling a glycoside compound to enter an electric fog detector for detection; step 3, performing quantitative measurement on the contents of the to-be-measured substances in the sample by adopting an external standard quantitative method. The method disclosed by the invention has thebenefits that the method combining the reverse-phase chromatography with the electric fog detector is established to perform qualitative and quantitative detection on glycosides with surfactant structures, so that the microgram per milliliter level of sample concentration can be accurately measured. The method is a high-throughput test method, and the to-be-measured glycosides in the sample are not required to be derived or modified. The invention provides the method which is wide in application range, accurate and effective for the qualitative and quantitative detection on the glycosides, thereby providing a strong support for dissolution, stability and characterization of membrane proteins.

The invention provides a method for simultaneously determining various heterocyclic pesticides, degradation products and intermediates in water by liquid-liquid extraction/liquid chromatography. The method comprises the following steps of by using dichloromethane as an extractant, extracting a neutral water sample added with sodium chloride, extracting the target, drying, and concentrating the extract to obtain the target product; purifying the extract, and replacing the solvent with acetonitrile or directly replacing the solvent with acetonitrile; and separating and detecting by using a liquid chromatograph, carrying out gradient elution by using a ternary mobile phase or a binary mobile phase during separation, and quantifying by using an external standard method according to the qualitative retention time to obtain the concentration of each target object in the water sample. The method is efficient, easy to operate, low in detection limit, good in accuracy and precision and good inlinear relation, 16 heterocyclic pesticides, degradation products and intermediates can be detected at the same time, and problems that an existing heterocyclic pesticide detection method is not highin integration level, incomplete in target object coverage and even vacant, tedious in step and high in detection cost are solved; requirements of heterocyclic pesticide environment monitoring and management in China at the present stage are met.

The invention discloses a carbon nano material modified electrode and a preparation method thereof. A carbon nano material, a Cu+ recognition ligand, a reference molecule and a pH response molecule are used as raw materials, and in a solvent at 10-25 DEG C, the carbon nano material, the Cu+ recognition ligand, the reference molecule and the pH response molecule are modified on the carbon nano material to prepare the carbon nano material modified electrode. The invention also discloses the application of the carbon nano material modified electrode for simultaneous detection of Cu+ and pH in vivo and in vitro. The invention also discloses the application of the carbon nano material modified electrode in simultaneously detecting Cu+ and pH, and the carbon nano material modified electrode hasthe advantages of high selectivity and high sensitivity; the electrode is used for measuring metal ions (Cu+) and pH in a body, and achieves simultaneous, in situ and real-time online electrochemicaldetection. The carbon nano material modified electrode has important significance for further elucidating the role of the Cu+ and pH in physiological and pathological processes.

The invention discloses a method for analyzing flavonoid chemical components in walnut flowers. The method comprises the following steps: extracting the medicine walnut flowers by using an ethanol heating reflux method, concentrating, redissolving, carrying out ultrasonic treatment, and filtering to obtain a test solution; detecting the test solution by using an ultrahigh performance liquid chromatography-quadrupole-time of flight mass spectrometry so as to obtain secondary mass spectrometry information of compounds, and analyzing the information about the chemical components in the detectionresult. The method provided by the invention can be used for rapidly and efficiently analyzing the flavonoid compounds in the walnut flowers, thus providing a basis for the research and rapid and accurate identification of effective substances of the walnut flowers and being beneficial to the development and utilization of the walnut flowers.

The invention discloses a macro-micro model equivalence method for analyzing the use state of reinforced concrete in a chloride ion environment, and relates to the technical field of building material analysis, and the method comprises the following steps: S1, establishing equivalence of mechanical properties of micro-concrete and macro-concrete models; S2, establishing an equivalent diffusion coefficient of a single aggregate and ITZ; S3, according to the quantity ratio of the aggregate with each particle size, obtaining equivalent diffusion coefficient Deq of aggregate and ITZ; and S4, enabling the mortar, the aggregate and ITZ mesoscopic concrete to be equivalent to a concrete macroscopic diffusion coefficient D. According to the method disclosed by the invention, aiming at a complex maritime work environment, the calculation dimension of an analysis main body can be effectively reduced and the calculation efficiency is improved while the analysis requirement is met by the equivalent method, and the basic method in the durability research of the reinforced concrete structure is further enriched and developed.