35 results about "Quantitative methodology" patented technology

Disclosed is a method of extracting all metabolites existing in a biological sample to detect a comprehensive difference between metabolites of a control group and a test group, thereby verifying significance thereof. More particularly, the invention comprises a first step of analyzing a fraction extracted with a solid phase extraction method, a fraction obtained by extracting the remnant fraction with a liquid-liquid extraction method and fractions extracted with the liquid-liquid extraction method at two pH different from each other after the hydrolysis, with a gas chromatography-mass spectrometry; a second step of converting the chromatogram result into numerical values capable of being statistically processed; and a third step of analyzing the numerical values with a principal component analysis (PCA) and a discriminant analysis (DA) to detect a difference between the control group and the test group. According to the invention, the difference between the two groups can be comprehensively detected with the areas of the peaks on the chromatogram, without a standard material or verified quantitative method. Therefore, it is possible to detect the metabolic change in the organism due to the disease or gene mutation, without an accurate quantitative analysis of the metabolites.

The invention discloses a method used for quantification of steel samples via combination with laser-induced breakdown spectroscopy. The method comprises following steps: 1, spectrum data is collectedso as to obtain two data sets; 2, the data sets are subjected to wavelet packet transformation, and spectrum peak intensity feature extraction so as to obtain wavelet packet energy, and the wavelet packet energy is adopted in a vector machine regression model as an input end; and 3, the vector machine regression model is established, and modeling prediction of content is carried out. According tothe method, wavelet packet transformation and an improved related vector machine kernel function quantitative analysis method are combined with laser-induced breakdown spectroscopy to realize rapid quantitative determination of steel samples.

The invention discloses a Logging big data real time driving based in-service oil casing pipe defect automatic determination method. The method includes: determining the minimum wall thickness threshold and the maximum depth of an in-service oil casing pipe, the depth increment and the circumference increment recorded by a logging meter, and wall thickness big data of the oil casing pipe; performing a value compensation treatment and a smoothing treatment on the wall thickness big data of the oil casing pipe; determining a defect zone of the oil casing pipe; quantitatively calculating out basic parameters of the defect zone of the oil casing pipe; and determining the qualitative type of a defect of the oil casing pipe through a quantitative analysis method. The method can perform data treatment and analysis in real time according to the logging big data, can effectively detect the defect zone of the oil casing pipe, can quantitatively calculating out the basic parameters of the defect zone of the oil casing pipe so as to achieve accurate positioning of the defect zone, and can accurately determine the qualitative type of the defect of the oil casing pipe through the quantitative analysis method. The method is good in real-time performance, is high in accuracy, is high in reliability, is full in information, and is high in degree of automation.

The invention discloses a landslide and rockfall protection design method based on three-dimensional laser scanning, comprising the following steps: S1. collection of three-dimensional topographical data; S2. three-dimensional rockfall simulation without protection; S3. preliminarily planning the installation position of a passive protection system; S4. Three-dimensional rockfall simulation with protection; S5. Statistics Based on the results of step S4, count the number of rockfalls after interception under each working condition, that is, the interception rate of rockfalls IR, the energy rate of escaping rockfalls ERER and the cost of the protective net Cost: S6. Protection effect Quantitative analysis: determine a new quantitative method based on IR, ERER and Cost to evaluate the passive protection net; S7. Determine the protection scheme: select the appropriate installation position of the protection net according to the comprehensive level of the protection net and the actual engineering needs. The present invention selects the site of the optimal rockfall protection net based on the interception rate IR, the remaining rockfall energy rate ERER and the cost Cost, so as to evaluate the protection efficiency and cost of passive protection nets with different site selection positions, and screen out the optimal installation position to achieve low cost. Cost-effective, high-efficiency protection system design effect.

The invention discloses a quantitative method for fish diversity based on eDNA and a sampling and filtering device thereof, and belongs to the field of fish diversity research. According to the method, sample DNA extraction is performed by adopting a filtering method, the eDNA-based quantitative sampling and filtering device for fish diversity is adopted, and stirring is performed at the same timeof multiple suction filtration, so that an experimental period is greatly shortened, and meanwhile, samples can be effectively avoided from being cross-contaminated in the experimental stage; the filtered samples are used for DNA extraction within 24 hours, which can effectively reduce DNA degradation; by adopting human tissue and a blood extract as an extractant, the maximum extraction amount can be obtained, and the extracted DNA concentration and purity are relatively high; by adopting DNA clone sequencing, the experiment cost can be reduced; an absolute quantitative PCR method is used forquantitative research of fish, absolute quantification can be used for determining the copy number or concentration of genes in the samples by a standard curve and a dissolution curve, the specificity is high and the accuracy is good.

The invention relates to the field of analytical chemistry, and more specifically relates to a method for precise quantitative analysis of metal elements using a patented technology combining a standard addition method and a differential method. This analysis method adopts the combination of standard addition method and difference method, and designs the standard curve concentration calculation formula based on the difference method. Combined with software calculation, the standard addition method is used to establish the standard curve, which improves the efficiency of preparing the standard curve and effectively reduces the matrix concentration. The interference caused by the effect, so as to realize the precise quantification of metal elements. This method greatly reduces the amount of calculation when using the traditional standard addition method to prepare a standard curve, thereby improving the accuracy and speed of quantitative analysis of harmful metal elements, so that the standard addition method can replace the standard curve method (external standard method), allowing metal elements to be accurately Quantitative methods can be applied to the detection of batch samples and as an efficient method of measuring element concentrations when the instrument used does not have a special device for measurement using the standard addition method.

The present invention relates to a label-based DIA quantification method. It utilizes dimethylation reaction to label peptides, realizes multiple labeling of peptide samples through the organic combination of various isotope forms of dimethylation labeling reagents, uses data-independent (DIA) acquisition mode to collect data, and extracts the corresponding Extracted ion chromatograms of multiple parent ions and product ions in the DIA data, using the extracted peak areas for multiple quantitative analysis of proteins. The advantages of this method are: high quantitative accuracy, good reproducibility, high labeling efficiency, simple method, low requirements on the reproducibility of the liquid-mass system, easy multi-dimensional separation of samples, and high throughput of quantitative proteome analysis. The invention improves the quantitative accuracy and throughput of the DIA strategy by marking, and has obvious advantages in the analysis of large sample proteomes.