12results about How to "Reduce analysis costs" patented technology

The invention provides a spark source atomic emission spectrometry determination method for acid-soluble aluminum and inclusion aluminum, and belongs to the technical field of assessment of inclusions in steel. The spark source atomic emission spectrometry determination method for acid-soluble aluminum and inclusion aluminum comprises the following steps: establishing a calibration curve of all aluminum, then determining integral intensities of inclusion aluminum, all aluminum and acid-soluble aluminum in a sample under corresponding conditions, and calculating the intensity of the inclusion aluminum by using a difference value between the integral intensities; selecting two standard samples with adjacent strength according to the strength of aluminum inclusion in the sample, and calculating a calibration coefficient K according to the aluminum content Al% lt; the excitation rate F is calculated according to the peak integral intensity of the inclusion aluminum and the integral intensity of the total aluminum in the 0.0007% standard sample, the inclusion aluminum content Als% is equal to K * F * (IAlt-IAls), and the content of the acid-soluble aluminum is equal to the difference between the content of the total aluminum and the content of the inclusion aluminum. According to the method, the accuracy of a measurement result is effectively improved while high analysis speed, low cost and simplicity and convenience in operation are ensured.

This invention provides an apparatus, system, and method for analyzing altered carbonate carbon isotopes. The apparatus includes: an enrichment component comprising at least one enrichment tube having an enrichment section; and a freezing component comprising a container filled with a refrigerant. The enrichment section is completely immersed in the refrigerant to freeze the target gas generated by sample decomposition within the enrichment section to a target concentration. Based on the technical solution of this invention, analysis of low-content altered carbonate carbon isotopes can be achieved; it can also simultaneously acquire multiple sets of samples required for altered carbonate carbon isotope analysis, saving time for detecting large quantities of altered carbonate carbon isotopes. Furthermore, the operation is simple, reducing analytical costs and providing a reliable technical means for the application of geochemical exploration technology.

This invention discloses a rapid prediction method for rail rolling contact fatigue damage in the field of rail damage prediction technology. The method includes establishing a three-dimensional elastoplastic wheel-rail cyclic rolling contact finite element model, improving the cyclic plastic constitutive model, and simulating the stress-strain evolution of the rail. A rail stress-strain sample library is generated through parametric sampling and batch calculation. A Physically Constrained Generative Adversarial Network (PC-GAN) is constructed, embedding physical constraints such as contact force conservation and energy consistency into the loss function to achieve rapid and high-precision mapping from operating parameters to the stress-strain field. Based on the PC-AN prediction results, cumulative damage and fatigue life are calculated using an incremental multiaxial fatigue damage model, and a damage distribution map of the entire rail line is drawn, identifying high-risk sections. This invention deeply integrates physical modeling with intelligent algorithms, achieving an order-of-magnitude improvement in rail fatigue damage assessment efficiency while ensuring prediction accuracy, providing efficient and reliable technical support for rail life assessment and maintenance decisions across the entire rail line.

The method for simultaneously determining multiple nitrophenol compounds in different food matrices according to the present invention involves preparing a series of mixed solutions with different concentrations of 2,4-dinitrophenol, 2,5-dinitrophenol, 2,6-dinitrophenol, 3,4-dinitrophenol, and 3,5-dinitrophenol using acetonitrile-acetic acid solution as standard samples; the food matrices to be tested are then subjected to extraction and purification treatment. The sample was obtained through a process; then, high-performance liquid chromatography-tandem mass spectrometry was used to detect the sample and standard to obtain the concentrations of 2,4-dinitrophenol, 2,5-dinitrophenol, 2,6-dinitrophenol, 3,4-dinitrophenol, and 3,5-dinitrophenol in the sample. The content of each nitrophenol compound in the food matrix was then calculated based on the concentrations of 2,4-dinitrophenol, 2,5-dinitrophenol, 2,6-dinitrophenol, 3,4-dinitrophenol, and 3,5-dinitrophenol in the sample.

The invention provides a direct shear test soil parameter calibration method fusing numerical simulation and machine learning, and relates to the field of geotechnical engineering. According to the direct shear test soil parameter calibration method fusing numerical simulation and machine learning, high-fidelity finite element numerical simulation, Kernel PCA dimension reduction, a PINN agent model and Bayesian parameter inversion are subjected to systematic deep fusion for the first time. The progressive damage process from the edge to the interior and non-uniform stress-strain distribution of a soil body in a direct shear test are precisely restored through high-fidelity finite element numerical simulation, low-dimensional essential characteristics of a high-dimensional response curve are extracted through a dimension reduction method, and a constitutive model and a strength criterion are embedded into an agent model to guarantee physical rationality. And finally, parameter estimation is realized through a Bayesian parameter inversion framework. The combination solves the interference of non-uniform stress and strain of the soil body in the direct shear test on parameter calibration, so that the calibration result better fits the actual mechanical property of the soil body.

This invention relates to the field of material analysis and detection technology, specifically disclosing a method for determining the lithium isotope ratio of spodumene using laser ablation-multiple-receiver inductively coupled plasma mass spectrometry (ICP-MS). The method includes: adding water vapor to the laser carrier gas to achieve wet plasma conditions; performing laser ablation with a laser spot size of 24-45 μm and a repetition frequency of 2-4 Hz; using natural spodumene megacrystalline crystals or synthetic spodumene glass with uniform lithium isotope composition as calibration reference materials, alternating with the sample to be tested for ablation analysis, and using a cross-injection method to correct instrument mass deviations. This invention systematically characterized four candidate reference materials, whose δ... 7 Recommended Li values ​​were 12.85±0.31‰, 12.29±0.31‰, 12.37±0.35‰, and 4.74±0.30‰, respectively. This method optimizes the water vapor addition rate and laser ablation parameters, which can reduce carrier gas consumption, decrease mass fractionation, and δ... 7 The accuracy of Li determination has been significantly improved, making it suitable for in-situ micro-area analysis in the mineralization study of pegmatite-type lithium deposits.

The invention discloses a method for measuring residual quantity of residual impurities DMAP and EDU in synthesis of antitumor drugs, and belongs to the technical field of drug analysis. According to the method, high performance liquid chromatography is adopted for detection; dimethyl sulfoxide is used as a solvent to dissolve the sample for detection; detection conditions of the high performance liquid chromatography are as follows: a chromatographic column is an octadecyl bonded silica gel column; the mobile phase A is a sodium perchlorate buffer solution or a potassium hexafluorophosphate buffer solution; the mobile phase B is acetonitrile; the detector is an ultraviolet detector; the detection wavelength for detecting the DMAP is 278 to 282 nm, and the detection wavelength for detecting the EDU is 198 to 202 nm; a gradient elution mode is adopted. The method is used for detecting DMAP and EDU residues in the raw material medicine, is high in sensitivity and accuracy, does not need a special column, can meet the control limit of the ICH guidance principle on genotoxic impurities and general impurities of the raw material medicine, provides reliable guarantee for impurity control of the raw material medicine, and further guarantees the safety of clinical medication.

The application provides a file monitoring method and an electronic device. The method comprises the following steps: during the running of a first operating system, changing a kernel code to replace an initial inotify event processing function in the kernel with a preset inotify event processing function; obtaining a target file operation event and target context information of a target file through the preset inotify event processing function; wherein the target file operation event and the target context information are determined by the preset inotify event processing function based on a preset first configuration file, and the first configuration file is used to record at least one target file; and recording the target file operation event and the target context information in a kernel log. By dynamically replacing the inotify event processing function and adding the context information of the file operation, the application can ensure that the key file operation is captured in time. In this way, during the problem positioning and troubleshooting process of the electronic device, the whole process of the event occurrence can be accurately restored, thereby greatly improving the maintainability of the system.

The invention belongs to the technical field of drug detection, and relates to a detection method for simultaneously determining two nitrosamine impurities in fluoxetine hydrochloride bulk drugs. Comprising the following steps: dissolving a fluoxetine hydrochloride bulk drug to obtain a test solution, and analyzing and detecting N-nitroso-fluoxetine and N-nitroso-fluoxetine EP impurity A in the test solution by adopting ultra-high performance liquid chromatography-mass spectrometry, in the analysis and detection process, a pentafluorophenyl propyl chromatographic column is adopted, a formic acid aqueous solution is used as a mobile phase A, acetonitrile is used as a mobile phase B, and gradient elution is performed; triple quadrupole mass spectrometry is used as a detector, electrospray ionization source detection is adopted, and multi-reaction detection of MRM is carried out through positive ion mode scanning. The method is stronger in specificity and higher in sensitivity, detection can be completed only in 12 minutes, and the content of two nitrosamine impurities in a sample can be accurately and rapidly detected. The method is of great significance to quality control of fluoxetine hydrochloride bulk drugs and guarantee of medication safety.

The application relates to the technical field of intelligent control, and discloses an unmanned water sample automatic analysis system and method based on artificial intelligence and a computer storage medium, which comprises a water sample access device, a water sample storage device, a water sample separation device and a water sample analysis device. Through the cooperative linkage of the water sample access device, the water sample storage device, the water sample separation device and the water sample analysis device, the system realizes the whole-process unmanned operation from water sample access, identification, control, storage, separation pretreatment to water quality analysis and result synthesis. It can be seen that the system described in the application can realize the full-automatic control and analysis monitoring of a plurality of water samples, and is favorable for improving the water quality analysis monitoring efficiency and the water quality analysis monitoring reliability.

The application discloses a method for detecting artepillin C in Brazilian propolis by using a thin layer scanner and belongs to the field of traditional Chinese medicine quality detection. The method specifically comprises the following steps: sucking the pretreated propolis sample solution and spotting the sample solution on a thin layer chromatography silica gel plate; adopting a mixed system of petroleum ether, ethyl acetate and formic acid with a volume ratio of (8-14):(3-6):(0.2-1) as a developing agent, flowing the developing agent through the fixed phase with the propolis sample solution, and drying to obtain a sample to be measured; scanning the chromatographic spots in the sample to be measured by using a thin layer scanner, testing the wavelength of 290-320 nm, the reference wavelength of 400-800 nm, and obtaining the absorbance integral value of the sample to be measured; and converting the absorbance integral value with an artepillin C standard curve to obtain the content of artepillin C in the sample to be measured. The method can simultaneously determine the content of artepillin C in multiple batches of propolis samples, the chromatographic peak of artepillin C is well separated and stable in scanning, and the method has the advantages of fast detection speed and low cost.

The invention discloses an equivalent analysis method for a maximum paraboloid assembled antenna, which greatly reduces the analysis cost of a module assembled antenna structure, and can quickly and accurately realize the evaluation of natural vibration characteristics and static deformation characteristics of module assembled antenna structures with different calibers. Two analysis methods of theoretical derivation and numerical simulation are combined when the scaling rule is constructed, full verification is carried out, and the scaling rule is accurate and reliable. According to the scaling rule, the mechanical property of the full-size on-orbit operation structure can be reflected through a mechanical test of a ground small-caliber prototype, and the method is suitable for industrial large-scale application and popularization.