52results about How to "Reduce analysis steps" patented technology

The invention discloses a method for quickly screening and detecting azo dyes forbidden in textile materials, leathers and dyes using gas chromatography mass spectrometry, which comprises the following steps: 1) preparing a sample, 2) subjecting the sample to reduction reaction, 3) extracting the sample, 4) performing the gas chromatography mass spectrometry on the sample, 5) screening decision: compared with the GC-MS analysis result of a standard solution, if the retention time and the mass spectrum of the aromatic amine in the sample keep with standards, the sample is judged as a suspicious positive sample, otherwise it is a negative sample and directly judged as a qualified sample. The sample pre-treatment time is shortened, the cost is reduced, the detection time is shortened, the operation step is simple, the operation is convenient, the operation time is short, the operation cost is low, the detection efficiency is improved; the aromatic amine in the sample is detected by a gas chromatography mass spectrometer, color interference problem is not existed, the sample matrix is effectively prevented from being infected, and the judgment accuracy is high, thus the method is not only suitable for textile materials, but also suitable for other products such as leathers and dyes.

The invention relates to a method for determining ethanol and isopropyl benzene contents of air and waste gas, and mainly aims to solve the problem that ethanol and isopropyl benzene cannot be sampled and analyzed at the same time in the air and the waste gas in the prior art. The method for determining ethanol and isopropyl benzene contents of the air and the waste gas comprises the following steps: (1) sampling with an activated carbon tube at a sampling point, immediately enclosing the two ends of the activated carbon tube after sampling, and waiting for determination; (2) opening the activated carbon tube collected in the step (1) during detection, pouring activated carbon into a solvent desorption bottle, and extracting upper-layer desorption solution for determination; (3) injecting the desorption solution obtained in the step (2) into a gas chromatograph, quantitatively analyzing under a certain chromatographic condition, and dividing a detection result by a sampling volume to obtain the concentrations of the ethanol and the isopropyl benzene in the air and the waste gas at a workplace. If the sample concentrations exceed a detection range, the problem is well solved by determination after dilution with the desorption solution. The method can be applied to determination of the ethanol and isopropyl benzene contents.

The invention belongs to an ocean chemical engineering technology, and particularly relates to a method for measuring the chitosan oligosaccharide content in a specific polymerization degree range. According to the method, a dextran standard product is subjected to chromatographic analysis, a standard curve is drawn, and a linear regression equation is obtained; chitosan oligosaccharide molecular weights M1 and M2 corresponding to two end values n1 and n2 of the specific polymerization degree range to be measured are substituted into the linear regression equation, and the chitosan oligosaccharide chromatographic retention time t1 and t2 of the two end values of the specific polymerization degree range to be measured; a chitosan oligosaccharide solution to be measured is analyzed by measuring the chromatographic analysis condition of the standard sample, the chromatographic peak total area A corresponding to the sample to be measured and the chromatographic area A<t1-t2> in the chitosan oligosaccharide chromatographic retention time t1 to t2 of the two end values of the specific polymerization degree range to be measured are obtained through a chromatogram of the sample to be measured, and the chitosan oligosaccharide content of the specific polymerization degree range n1 to n2 is obtained according to a chromatographic area formula. The method has the advantages that the chitosan oligosaccharide content of the specific polymerization degree is indirectly measured by using the molecular weight as a calibration measure through gel exclusion chromatography, the analysis steps are few, and the operation is simple and convenient.

The invention discloses a rapid analysis method for sodium hydroxide and ammonia content in sodium cyanide reaction solution and its liquid products, which uses excess formaldehyde and ammonia to react to generate hexamethylenetetramine, and then divides into two groups of titration with hydrochloric acid, Obtain two sets of values ​​of ammonia-containing acid consumption and ammonia-removing acid consumption, and then calculate the content of sodium hydroxide and ammonia in the sample through data measurement, thereby effectively reducing the interference of free ammonia on the analysis of sodium hydroxide content, and quickly and accurately analyzing cyanide. Sodium hydroxide content and ammonia content in sodium chloride reaction liquid and its liquid products. The method of the invention is fast and effective, has obvious mutations in analysis and titration, accurate and reliable measured values, simple and convenient operation and easy mastery.

The invention relates to the technical field of network security and data processing, and relates to a method, device and equipment for analyzing and classifying network traffic and a storage medium.The first aspect of the invention provides a method for analyzing and classifying network traffic, which comprises the following steps of: acquiring a message; shunting the message according to a protocol, wherein the message at least comprises common TCP/UDP; for the common TCP/UDP, extracting the fingerprint of each type according to a payload clustering method; obtaining a domain name with themaximum jaccard coefficient in the network connection; and judging whether the existing resource library has related characteristics or not, and if not, storing the corresponding classification rules.The invention further provides electronic equipment and a computer readable storage medium. According to the method for analyzing and classifying the network traffic, a sample library does not need to be prepared in advance, the traffic in the network can be automatically classified, the attribution service of each type of traffic is analyzed, and the whole process realizes automatic and accurateclassification.

The invention discloses a spectrum-potential-temperature multi-dimensional titration analyzer. The analyzer comprises a spectrum titration measurement device, a temperature titration measurement device and a potential titration measurement device arranged in parallel; synchronous measurement requirement of different analysis methods in chemical analysis can be satisfied, the measurement precision between different measurement methods is improved, the workload of repeated single experiments is effectively reduced, and the synchronous measurement for the same analysis object and different analysis methods can be realized. The invention further provides a use method of the spectrum-potential-temperature multi-dimensional titration analyzer, analysis results in different angles and with different representation parameters can be provided for the material structure change process in the chemical reaction by comparing and analyzing the data obtained through different measurement technologies, the precision between different measurement methods and the accuracy of the analysis method are balanced, the workload of the titration analysis is effectively reduced, a more accurate measurement method can be acquired, and the new material physical character and structure data can be discovered.

The invention discloses a distribution network reliability evaluation method suitable for a distributed power supply with high permeability. The method comprises the following steps of dividing a power supply area of the distributed power supply and obtaining a normal system operation period and a system failure operation period through uniform random number inverse transformation; carrying out power matching in the normal system operation period to obtain failure times and failure time of each load point in the corresponding period; carrying out failure effect analysis to obtain an isolated island operation state of each area and the failure times and the failure time which are generated by the failure effect of the component on the load point according to a relative position of a failurecomponent and each area; carrying out power matching in the system failure operation period to obtain the failure times and the failure time of each load point in the corresponding period according to the isolated island operation state of each area; and simulating for many times to obtain the failure times and the failure time of each load point in the simulative total period and computing a reliability index. According to the method, the distribution network reliability evaluation method under the high permeability condition of the distributed power supply is realized.

The embodiment of the invention discloses a method and system for analyzing a splicing wall. The analyzing operation of the splicing wall is made simple, standard and unified, the analyzing process can be quantized, and the analyzing efficiency is improved. The method comprises the steps that a splicing wall analyzing system acquires first color gamut data of a preset image displayed by the splicing wall, the first color gamut data are converted into second color gamut data capable of reflecting the brightness and the chroma of the image, the difference of the brightness and the chroma of a preset point is compared according to the second color gamut data, and therefore the analysis of color consistency of the splicing wall is obtained.

The invention relates to a bolt pre-tightening force application method for nonlinear analysis of complex connection structures. The method comprises the following steps: 1, converting bolt pre-tightening force moment into bolt axial force; 2, simplifying a pre-tightening force bolt loading form; 3, carrying out displacement calculation on the bolt axial pre-tightening force; and 4, cutting off a pre-tightening force bolt at any place, establishing the constraint relationship between two sections and the section midpoints thereof, and connecting the midpoint 1, the midpoint 2 and a loading point 3, wherein MPC (multipoint constraint) connection is adopted between the midpoint 1 and the section 1 as well as between the midpoint 2 and the section 2, the translation motion and rotation are constrained through the constraint between the midpoints and the sections, namely, Ux/Uy/Uz and Rx/Ry/Rz. The bolt pre-tightening force application method for nonlinear analysis of complex connection structures is obtained through carrying out improvement on the basis of a traditional bolt pre-tightening force application method, so that the simplification of the nonlinear analysis of complex connection structures, the calculation period is effectively shortened and the working efficiency is improved.

The invention discloses an adjustable differential pressure flowmeter, and relates to the technical field of differential pressure flowmeters. The adjustable differential pressure flowmeter comprisesa fixing plate; a differential pressure transmitter and a flow display instrument are fixedly mounted at the top of the fixing plate; a self-adjusting pore plate mechanism is fixedly installed in thefixing plate; four connecting rods are fixedly connected to the left side of the fixing plate at equal intervals; the ends, away from the fixing plate, of the four connecting rods are fixedly connected with a two-phase detection mechanism; and the two-phase detection mechanism comprises a fixing ring piece, an electric heating ring, a vertical rod and a first contact type sensor. The two-phase detection mechanism is matched with the self-adjusting orifice plate mechanism, so that compared with a traditional flowmeter, the flowmeter of the invention can omit the step of analyzing the componentsof detected fluid, and can realize a detection function based on the flowmeter itself under the condition that normal flowing of the fluid is not affected, and an orifice plate can be correspondinglyadjusted according to a detection result.