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

Vibration modeling and analyzing method of crack impeller structure of centrifugal compressor

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.
Owner:XI AN JIAOTONG UNIV

Method for determination of phytic acid content of cotton seed powder

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.
Owner:ZHEJIANG UNIV

Method for measuring carbonyl compound in electronic cigarette liquid

ActiveCN104267135ARapid determinationSimple elution procedureComponent separationSolventChemistry
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.
Owner:CHINA TOBACCO ANHUI IND CO LTD

Method for detecting microelements in chromium powder

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.
Owner:ZIGONG CEMENTED CARBIDE CORP

Psychological behavior analysis method based on compatible storage rate and FP-growth

The invention relates to a psychological behavior analysis method based on a facultative rate and FP-growth and belongs to the technical field of data mining. The method includes, firstly, establishing an affair database of human psychological behavior vocabulary data; then, solving a compatible storage rate and a minimum compatible storage rate of each psychological behavior vocabulary compatiblestorage rate item so as to reserve a strong association item and generate a new transaction set D; then, scanning the D for the first time, and calculating and reserving frequent vocabularies; then scanning D for the second time, and constructing a frequent pattern tree FP-tree, and extracting a frequent item set; secondly, generating a corresponding strong association rule by each frequent itemset, and calculating the confidence degree of each strong association rule; and finally, sorting the frequent item sets according to the confidence degree of each strong association rule, and visuallydisplaying the association degree of each psychological behavior vocabulary according to the result. According to the invention, the optimized PE-growth algorithm plays a role in correlation analysisof human psychological behavior vocabularies, and a more accurate and efficient analysis method is provided for disciplines such as psychology and micro-expressions.
Owner:KUNMING UNIV OF SCI & TECH

Device for measuring internal structure of coke and measuring method thereof

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.
Owner:BAOSHAN IRON & STEEL CO LTD +1

Method for qualitative and quantitative detection on glycoside structured surfactant

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.
Owner:SHANGHAI WUXI BIOLOGIC TECH CO LTD

Method for simultaneously determining multiple heterocyclic pesticides, degradation products and intermediates in water by adopting liquid-liquid extraction/liquid chromatography

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.
Owner:湖南省生态环境监测中心

Method for analyzing scratch of hard and brittle materials on basis of trochoidal feed tracks

ActiveCN108627386AClose logical relationshipComplete analysis methodStrength propertiesGeometric relationsMaterial removal
The invention discloses a method for analyzing scratch of hard and brittle materials on the basis of trochoidal feed tracks. The method includes acquiring test pieces with trochoidal scratch; dividingtrack line distribution regions of the test pieces; extracting experimental factor representation information of 'point', 'line' and 'plane' critical regions according to particular experimental schemes by the aid of corresponding observation equipment by reference to track line division rules; integrating related theories such as theoretical mechanics and fracture mechanics with one another, combining information acquired by trochoidal scratch track critical region equipment and analyzing correlations between experimental factors and material damage and material removal mechanisms. Divisionrules for the track line distribution regions are plane space geometric relations among 'points', 'lines' and 'planes'. The experimental factor representation information of the 'point', 'line' and 'plane' critical regions is related to the material damage and material removal mechanisms. The method has the advantage that the method is a complete and efficient method with close logic relations andaccordingly has a great scientific research value in the aspect of research on hard and brittle material removal mechanisms.
Owner:TIANJIN UNIV

A method for the determination of carbonyl compounds in electronic cigarette liquid

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.
Owner:CHINA TOBACCO ANHUI IND CO LTD

A psychobehavioral analysis method based on coexistence rate and association rules

The invention relates to a psychological behavior analysis method which is always based on coexistence rate and association rules, belonging to the technical field of data association rules mining. Firstly, a transaction database of human psychological and behavioral vocabulary data is established. Then, the coexistence rate and the minimum coexistence rate of the coexistence terms of the mental behavior words are obtained, so that the strong correlation terms are preserved and a new transaction set is generated. Then, the association rule algorithm is introduced to compute the frequent itemsets with different number of items, in which each mental behavior word in the new transaction set is regarded as an item. Secondly, the corresponding strong association rules are generated from each frequent itemset, and the confidence level of each strong association rule is calculated. Finally, by sorting these frequent itemsets according to the confidence level of each strong association rule, the result directly shows the relevance degree of each psychological behavior words. The invention provides that the coexistence rate optimizes the data of the association rule algorithm, and the optimized association rule algorithm plays an association analysis role on the human psychological behavior vocabulary.
Owner:KUNMING UNIV OF SCI & TECH
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