22results about How to "Accurate method" patented technology

The invention provides a method for identifying gallnut honey by utilizing a characteristic marker, and belongs to the technical field of honey detection. According to the method, kynurenic acid is taken as a characteristic marker, quantitative detection is carried out on kynurenic acid through a high performance liquid chromatography-diode array detector method, and the content of kynurenic acid in gallnut honey is not lower than 14 mg / kg. The kynurenic acid is used as the characteristic marker of the gallnut honey for the first time, the developed identification method also can successfully discriminate the gallnut honey, and the method has the advantages of simple pretreatment, common instruments and mobile phases, low cost, short time, accuracy and the like, and is suitable for industrial production. The method has application potential in gallnut honey identification and product grading.

The invention relates to the field of analytical testing, and particularly discloses a novel whitening and freckle-removing component peptomidodol quantitative method which comprises the following steps: (1) drawing a peptomidodol standard curve; (2) preparing a sample solution; and (3) high performance liquid chromatography detection and analysis. According to the present invention, with the liquid chromatography external standard method and the specific pretreatment means, the peptomidogen content in the cream sample can be simply, rapidly and efficiently determined, such that the peak interference problem of various substances is solved, and the quantitative error of the peptomidogen is reduced.

The invention provides a method for detecting two types of chloronaphthylamine in drinking water by gas chromatography-mass spectrometry, which comprises the following steps: optimizing conditions such as a chromatographic column and temperature programming thereof, an extracting solvent and the use amount thereof, and combining liquid-liquid extraction with a gas chromatography-mass spectrometer to detect two types of chloronaphthylamine in drinking water. The invention establishes a novel method for simultaneously determining the content of two novel nitrogen-containing disinfection byproducts 2-chloro-1-naphthylamine and 4-chloro-1-naphthylamine in drinking water. The method has the characteristics of simplicity, accuracy, good reproducibility, high sensitivity and the like, is suitable for quantitative detection of 2-chloro-1-naphthylamine and 4-chloro-1-naphthylamine in drinking water, and provides a technical means for guaranteeing the quality safety of domestic drinking water.

The invention relates to a detection method of a medicine for dispelling wind and eliminating dampness. The detection method comprises the following steps: thin-layer identification of a notopterygium root medicinal material, thin-layer identification of a radix angelicae pubescentis medicinal material, thin-layer identification of a radix saposhnikoviae medicinal material, thin-layer identification of ligusticum and ligusticum wallichii medicinal materials, and thin-layer identification of a honey-fried licorice root medicinal material. Through methodological investigation, the detection method has the effects of strong specificity, good durability, clear spots after thin layer expansion, satisfactory separation degree and the like, can effectively control the product quality condition, improves the product quality detection standard, and ensures the product quality.

The invention discloses an aircraft pneumatic data correction method based on parameter identification, which comprises the following steps: in a fixed wing mode, an aircraft stably and flatly flies at a certain fixed speed, and test flight data is recorded; in the fixed wing mode, on the basis of the first step, tail thrust is closed, gliding is kept at the stable speed, and test flight data are recorded; in the fixed wing mode, the flight speed is changed, and the steps 1-2 are repeated; and processing data according to a kinematics equation of the airplane to obtain an airplane lift-drag coefficient and tail thrust aerodynamic data, so as to correct the model. According to the method, the flight mechanics mathematical model is corrected by adopting a parameter identification method, the tail thrust model with interference can be accurately identified, and a basic guarantee is provided for control system design, aircraft simulation and flight quality evaluation of an aircraft.

This invention provides a system for evaluating the breakthrough pressure of temporarily plugged chemical bridge plugs, comprising: a high-temperature oven; a breakthrough pressure main device for holding the base fluid of the temporarily plugged chemical bridge plug, which can be arranged inside the high-temperature oven, the breakthrough pressure main device having an inlet pipeline and an outlet pipeline; a horizontal flow pump for injecting a displacement medium, the horizontal flow pump being connected to the inlet pipeline; a first pressure sensor and a second pressure sensor respectively installed on the inlet pipeline and the outlet pipeline; a pressure sensor workstation connected to the first pressure sensor and the second pressure sensor for recording the data measured by the first pressure sensor and the second pressure sensor; and a camera for capturing the breakthrough process of the temporarily plugged chemical bridge plug. This invention also provides a method for evaluating the breakthrough pressure of temporarily plugged chemical bridge plugs.

The invention discloses an electroencephalogram emotion recognition method and device based on comparative learning and a graph neural network. The method comprises the steps that firstly, data preprocessing is conducted on electroencephalogram signals, baseline signals are removed, and time sequence segmentation and baseline effect removal are conducted; then constructing a node feature extraction module, and extracting time and space features by using time convolution and depth separable convolution; next, sampling and aggregating neighbor node features on the complete undirected graph by using a GraphSAGE algorithm, and generating graph-level features through a full connection layer; then, constructing a comparative learning module, generating a triple sample pair according to the graph-level features, carrying out triple comparative learning, and selecting a semi-hard negative sample for training; and finally, constructing a classifier through a full connection layer and a softmax function to perform emotion classification. According to the method, the time and space features and the graph structure information of the electroencephalogram signals are effectively extracted and utilized through the method combining comparative learning and the graph neural network, and the accuracy of emotion recognition is improved.

This invention relates to the field of drug detection technology, specifically to a method for detecting nitrogen oxide impurities in vonoprazan fumarate tablets and its application. The invention employs liquid chromatography-mass spectrometry (LC-MS) to detect the nitrogen oxide impurities in the sample. The detection method provided by this invention can achieve qualitative and quantitative analysis of nitrogen oxide impurities in vonoprazan fumarate tablets, and has advantages such as high impurity separation, good specificity, high precision, good repeatability, and high sensitivity. The method is accurate and reliable and can be widely applied to the quality testing of vonoprazan fumarate tablets.

This invention discloses an immune cell with enhanced anti-tumor effect, its preparation method, and its application. Experiments using this invention show that... SERTAD1 CD8 gene overexpression + T cells can enhance their function in anti-tumor immunotherapy. SERTAD1 Gene overexpression can downregulate CD8 + The expression of immune checkpoint molecules on T cells upregulates the expression of mRNAs of tumor-killing cytokines. In the MC38-OVA subcutaneous tumor model, Naïve CD8 cells were extracted from OT-I mice. + T cells were infected with a virus to overexpress SERTAD1, followed by adoptive transfer to mice. The results showed that SERTAD1 overexpression enhanced CD8 expression. + T cells kill MC38-OVA cells, inhibit the growth of MC38-OVA tumor cells, and overexpress SERTAD1 CD8. + The tumor volume and weight in the T-cell adoptive group were significantly smaller than those in the control group.

This invention relates to a rapid prediction method for the spoilage period of heat-sensitive, oil-containing powdered products. The method includes: measuring the shelf life (t) of pure oil products from different manufacturers with the same shelf life; measuring the OSI value of the oil at 120°C and calculating the average value (a); placing the oil-containing powdered products in ovens at different temperatures for fortification, and determining the highest fortification temperature (T) at which browning does not occur; taking pure oil with an OSI value of a ± 0.1 h and measuring the sensory spoilage period (d days) of the pure oil at T°C, and calculating the average peroxide value rate (V1); fortifying the oil-containing powdered products at T°C for d days; taking oil-containing powdered samples before and after fortification, extracting them with an organic solvent to obtain the extracted oil before and after fortification, and calculating the average peroxide value rate (V2); if V2 ≤ V1, then the predicted spoilage period of the oil-containing powdered products is ≥ t. This invention provides a simple and highly accurate method.

The application provides a high-temperature connecting piece evaluation method and system considering stress relaxation, and relates to the technical field of connecting piece performance detection, and comprises the following steps: determining the type of complex load according to the pre-tightening force of the connecting piece; determining the attribute value of the connecting piece according to the complex load type; obtaining the initial equivalent stress level calculation equation under the type of the complex load according to the attribute value and the stress distribution characteristics of the complex load type; determining the Norton-Bailey constitutive equation coefficients A, stress index m and time index n, establishing the equivalent relaxation theory equation, and obtaining the axial average stress of the connecting piece after relaxation in combination with the composition working condition characteristics of each load in the complex load type; and comparing the axial average stress of the connecting piece after relaxation with the preset minimum clamping limit value to evaluate the connecting piece. The application solves the problem of lacking a stress relaxation calculation method for high-temperature connecting pieces under complex load in the prior art.

The invention provides a method for evaluating shale oil molecule composition in different occurrence states under in-situ conditions of medium and high-maturity shale. The method comprises the following steps: performing pressure-maintaining coring to obtain a shale sample; rapidly crushing the shale sample to 20-60 meshes, and carrying out component analysis in TD-GC (Time Division-Gas Chromatography) to obtain the free oil light component molecular composition in the communicating holes; the method comprises the following steps: crushing a shale sample to 2.5-5 meshes, and sequentially and respectively extracting by using normal hexane and dichloromethane; then crushing the residue shale sample to 60-80 meshes, and extracting by using dichloromethane; finally, crushing the residue shale sample to 200-250 meshes, and extracting by using a mixed solvent of dichloromethane and methanol; and carrying out molecular composition analysis on the obtained extract. According to the method, light component dispersion loss is considered, and the reliability and persuasion of an evaluation result are greatly improved; molecular composition of shale oil in different occurrence states is determined, difference of molecular composition of shale oil in different pore spaces is clarified, and shale oil component systematic evaluation is realized.

The present invention discloses an efficient numerical analysis method based on a regular space grid, which comprises the following steps: step 1, meshing a structural model, dividing it into a plurality of grid units, the grid unit where the boundary of the structural model is located is called a boundary unit; step 2, multi-level subdividing the boundary unit into a plurality of subdomains, the subdomain where the boundary of the structural model is located is called a boundary subdomain; reconstructing the boundary within the boundary subdomain to obtain a reconstructed boundary; step 3, generating the equilibrium equation of the structural model based on the reconstructed boundary, and solving to obtain the field variables of the structural model; post-processing the field variables to obtain the analysis result of the structural model. The method described in the present invention can better balance the calculation efficiency and calculation accuracy, and can obtain more accurate results in a faster way compared to the existing analysis method.

The present invention belongs to the field of unmanned driving technology, and specifically discloses a synchronous positioning and mapping method based on heterogeneous multimodal data fusion. The present invention solves the problems existing in traditional positioning and mapping methods when applied to complex environments such as tunnels by means of data fusion of millimeter-wave radar and lidar, filtering of dynamic objects, enhancement of loop detection, and global consistency optimization, and provides a more accurate, stable, and adaptable positioning and mapping method. The method of the present invention can be applied to the positioning and mapping of autonomous mobile devices such as drones and robots in dynamic environments such as tunnels, and can provide stable positioning and map building capabilities in the presence of dynamic obstacles (such as construction equipment, vehicles, etc.) and low light conditions, significantly improving the positioning accuracy, map building capabilities, and system stability of drones or robots in complex dynamic environments.

The invention provides a method for detecting pinholes in the surface of enamel steel. The method comprises the following steps: 1) surface cleaning: cleaning the surface of an enamel steel product and then drying; 2) electrochemical treatment: carrying out electrochemical treatment on the dried enamel steel product in an electrolyte solution by adopting a two-electrode system and a constant current mode; wherein the working electrode adopts a steel substrate of the enamel steel product treated in the step 1), and the auxiliary electrode adopts an inert electrode; the color of the electrolyte solution is different from that of an enamel layer on the surface of the enamel steel product; and 3) detection and identification: after the electrochemical treatment is finished, taking out the enamel steel product, drying, and detecting whether a color mark of the electrolyte solution appears on the surface of the enamel steel. According to the method, an electrochemical method is adopted, obvious color marking (different from the color of a surface enamel layer) is carried out at pinhole positions through electrochemical treatment, so that pinholes in the surface of the enamel steel are exposed and easy to find, and rapid and accurate identification of the pinholes in the surface of the enamel steel is realized.

The invention relates to the technical field of pharmaceutical analysis, and particularly discloses a method for detecting in-vivo prototype components in an antiviral traditional Chinese medicine composition. According to the method, an octadecyl bonded silica gel chromatographic column is used as a detection chromatographic column, 0.08%-0.12% formic acid aqueous solution-acetonitrile is used as a mobile phase, a gradient elution procedure is adopted, and specific mass spectrum conditions are matched, so that more comprehensive identification and identification of 46 blood-entering prototype components in the antiviral traditional Chinese medicine composition are realized; and a reliable experimental basis is provided for identifying the pharmacodynamic material basis of the antiviral traditional Chinese medicine composition. Meanwhile, research on the in-vivo pharmacokinetic process of prototype components in the antiviral traditional Chinese medicine composition is further facilitated, pharmacokinetic markers of the antiviral traditional Chinese medicine composition can be screened according to the in-vivo absorption condition of the compounds, and a data foundation is laid for deep research on the action mechanism of the antiviral traditional Chinese medicine composition.

The present invention belongs to the field of medicinal material identification, and specifically relates to a primer probe set and a real-time fluorescence PCR identification method for identifying striped scorpion. The present invention takes striped scorpion as the research object, and based on the mitochondrial gene sequence of East Asian scorpion, striped scorpion and other common confused products, spiked messenger scorpion, the specific primers and probes of striped scorpion are studied and found, and the primers, probes and fluorescence PCR method are applied to striped scorpion medicinal materials, powder and Chinese patent medicine containing the medicinal materials, to identify the striped scorpion medicinal materials from the DNA level. The method is fast, accurate, effective and safe, and can realize the qualitative detection of striped scorpion medicinal materials.

A method for estimating and simulating the distribution of spatial point events based on B-spline smoothing, comprising: collecting independently recorded spatial point location data corresponding to a number of spatial location nodes; selecting the least squares estimator or maximum likelihood estimator using B-spline smoothing according to the number of samples, and obtaining the optimal coefficient matrix by solving the corresponding optimization problem; calculating the intensity function using the obtained optimal coefficient matrix estimate, and applying the Thinning algorithm to generate pseudo data for simulating the distribution of spatial point events, which are further used in Monte Carlo simulation to infer the expected value of spatial statistics. The method exhibits significant flexibility, smoothness and robustness when processing spatial data, effectively reduces the impact of noise data, and improves the accuracy and reliability of the model. Through experimental verification, the present invention is superior to the traditional kernel method in multiple evaluation indicators, and provides a new and efficient solution for the estimation and simulation of spatial point event distribution.

The invention relates to a method for detecting polymer impurities in potassium sodium dehydroandroan drographolide succinate and application of the method, and the detection method comprises the step of detecting a sample by adopting a liquid chromatography-mass spectrometry method to obtain the content of the polymer impurities. The detection method provided by the invention can realize qualitative and quantitative analysis of polymer impurities in potassium sodium dehydroandroan drographolide succinate, has the advantages of high impurity separation degree, good specificity, high precision, good repeatability and high sensitivity, is accurate and reliable, and can be widely applied to quality detection of potassium sodium dehydroandroan drographolide succinate.

The present invention relates to a method for separating and detecting 1,3-propane sultone, and belongs to the field of analytical chemistry. The method comprises: using a chromatographic column with octadecylsilane bonded phase filler, wherein the mobile phase is divided into phase A and phase B, wherein phase A is an aqueous solution of ammonia water or an ammonium salt, and phase B is acetonitrile. The method of the present invention has high sensitivity, good specificity, and reliable accuracy.

The present invention discloses a scaled test design and calculation method for the circumferential joint of a shield segment. The method decomposes the function of the bolted joint of the prototype shield segment into tensile resistance, shear resistance, and bending resistance, and accordingly designs a combined joint model of "external spring connection component and internal sleeve bolt". Then, based on the equivalent stiffness hypothesis theory and similarity theory, the equivalent condition expressions required for each component of the combined model joint are calculated, and then the specific physical and mechanical parameters of each component are determined according to the specific situation and construction requirements. The scaled model of the circumferential joint designed and calculated by this method can accurately and effectively simulate the shear resistance, tensile resistance, and bending resistance of the bolted circumferential joint of the prototype segment at the same time, and can restore the mechanical properties of the shield segment joint with discontinuity under actual conditions to a large extent, thereby providing a reference and basis for various shield tunnel model tests.

The application discloses a method for measuring electromagnetic wave propagation constant of two-dimensional periodic structure. The method is based on field values of five points in the structure, and uses an analytical expression containing the field values of the five points to respectively express phase constants and attenuation constants of two dimensions of the two-dimensional periodic structure. The method is simple, fast and accurate. The method can be used for two-dimensional uniform structure, two-dimensional periodic structure, closed transmission line structure, open transmission line, two-dimensional waveguide structure, antenna radiation structure, non-loss structure and loss structure.