75results about How to "Meet the requirements of the analysis" patented technology

The invention provides a combined liquid chromatography-mass spectroscopy method for high-flux detection of 113 lipids in a blood sample of a living body, belonging to the field of bioanalytical chemistry. The method comprises the following steps: subjecting a to-be-detected sample to pretreatment; then adding a reaction solvent and an extraction agent for extraction; and then carrying out liquid chromatographic-mass spectroscopic detection. The method is simple to operate and high in selectivity and sensitivity, and can rapidly detect 113 lipids in blood, wherein the 113 lipids include 48 of phosphatidylcholines (PC), 21 lysophosphatidylcholines (Lyso-PC), 17 phosphatidylethanolamines (PE), 4 lysophosphatidylethanolamines (LPE), 6 lysophosphatidylinositols (PI), 9 sphingomyelins (SM) and 8 ceramides (Cer). The method has precision meeting requirements on analysis of serum samples, good stability and high detection sensitivity to most lipid metabolites, and is applicable to lipidomic analysis of serum samples.

The invention discloses a method and a device for analyzing trace gaseous elemental mercury, and belongs to the technical field of atmospheric environment monitoring. In the method, the whole analysis process is controlled by a programmable logic controller. The method comprises the following steps of: arranging a mercury trapping tube collecting atmospheric gaseous elemental mercury (GEM) samples into a pyrolysis releaser for rapid heating, removing acid components carried by released HgO vapor from the released HgO vapor, introducing the HgO vapor into a secondary enrichment/pyrolysis releaser, and secondarily absorbing the HgO vapor by using the mercury trapping tube in the secondary enrichment/pyrolysis releaser; and rapidly heating the secondary enrichment/pyrolysis releaser, and blowing the secondarily pyrolyzed desorbed HgO vapor into a cold atomic fluorescence detector for quantitative detection by using a carrier gas. The device provided by the invention has a simple system, and is reliable in running; the atmospheric GEM samples collected by the mercury trapping tube are analyzed after being secondarily enriched, pyrolyzed and released so as to effectively reduce the limit of detection of the device and meet the requirements of trace analysis on the atmospheric GEM.

The invention belongs to the new material alloy element analysis technology, and relates to an analysis method for determining titanium, vanadium, tungsten, manganese and silicon in a K25 chromium-base high temperature alloy. The analysis steps comprise: weighing a sample; preparing a sample solution; preparing a calibration solution; measuring concentrations of titanium, vanadium, tungsten, manganese and silicon in the sample solution; and calculating the measurement result to obtain contents of titanium, vanadium, tungsten, manganese and silicon. According to the present invention, the ICP-AES method for determining contents of titanium, vanadium, tungsten, manganese and silicon in the K25 chromium-base high temperature alloy is provided, wherein the method has characteristics of high analysis sensitivity, simple operation, short analysis period, high efficiency and wide application prospect, can meet engineering application of the high temperature alloy, can meet requirements of scientific research and production on material quality control, and further has characteristics of product scrap rate reduction, development saving and production cost saving.

The invention provides a malicious code analysis method and system under a Linux platform. According to the method and the system provided by the invention, dynamic loading can be realized by using an LKM (Loadable Kernel Module) technology, a position of intercepting system call is positioned between a VFS (Virtual File system) layer and a detailed file system so as to acquire more information related to file operation and provide more accurate and useful monitoring information. The system call can be intercepted without the need of correcting a system call table, so that the potential safety hazards brought by the traditional method of correcting the system call table are avoided; a shared memory mechanism is adopted to increase the communication speed of a kernel module and a user progress, and the data volume of communication transmission; key files and progresses needing to be monitored are selected by a user so as to improve the usability, the flexibility and the high efficiency of the system, and the demands of the user on malicious code analysis are well met; the selected malicious code progresses and a plurality of important key files are monitored so as to avoid great performance loss of the system and improve the operation speed of the analysis system.

The invention discloses a concealed channel identification method. A system source code is used as an analysis object. The method comprises the following steps of: formally describing a concealed channel in a secure information system as (V, PAh, PVl, P); then dividing a system to be analyzed into relatively independent subsystems; searching related function calling branches in the subsystems by using a shared variable as a basic unit, and further constructing directed information flow graphs according to an information flow relationship; and pruning each information flow graph according to the formal description of the concealed channel to eliminate invalid flow branches and variable aliases in the code, wherein all flow nodes and function calling branches in the finally obtained information flow graphs are potential concealed channel forming factors. The method is suitable for source codes of information systems such as an operating system, a database, a network and the like of high security level, has wide application range, high execution efficiency and low error report rate and missing report rate, can identify the potential concealed channel in the system, and meets the requirement of security standards on concealed channel analysis.

The invention discloses an online pretreatment method and an online pretreatment device of SVOCs (Semi Volatile Organic Compounds) in water. A water sample circulates to carry out contact adsorption with a fixed extracting rod by using an online pulse extraction technology, so that the competitive adsorption of the surface of a stirrer on the sample in solid phase microextraction of fiber is avoided, and the extracting rod is prevented from colliding with a container, thus the service life is prolonged. On the basis of the method, the invention also provides the online pretreatment device of the SVOCs in water, which can be used for realizing procedures of fully-automatic sampling, sampling matching, adsorptive enrichment, analysis and self-washing of a flow passage as well as intermittent pretreatment of the SVOCs in the water sample and is very suitable for online pretreatment of the SVOCs in the water.

The invention provides an automatic anticipated fault set generation method based on a typhoon model. The method comprises the following steps: acquiring a fracture surface and geographic information of power grid operation mode data, establishing a typhoon model, determining a typhoon influence zone, judging overhead line fault risk, and automatically generating an anticipated fault set. According to the automatic anticipated fault set generation method provided by the invention, an overhead line fault risk judgment standard is provided according to a reasonable typhoon model, the typhoon influence scope with relatively high danger level for an overhead line is calculated, then the typhoon influence zone is obtained through the typhoon data, and finally, in combination with the power grid geographic information and multi-point fault recognition, a fault set is automatically generated.

The invention discloses an analytical method for identifying gold, platinum and palladium in chemical samples. Analytical identification process is completed by firing samples, dissolving ore by aqua regia and vibrating and enriching composite resin and determining by plasma mass spectrography. The analytical method can precisely analyze ultratrace gold, platinum and palladium under low detection limit, batch production and low cost so as to meet various technical requirements for analyzing geochemical samples.

The invention discloses a segmenting method for a surface electromyogram signal activity section based on sample entropy and a Gaussian model. The segmenting method comprises the steps that 1 electricpotential values of surface electromyogram signals are collected from the related muscles of the human body, widths u and step lengths f of sliding windows are set, and sliding segmentation is conducted on data; 2 sample entropy parameters m and r are set, and the sample entropy of each sliding window is calculated; 3 a DBSCAN cluster method is adopted for determining a Gaussian polynomial basicmodel, and then model parameters are initialized; 4 a nonlinear least square method is adopted for fitting of the Gaussian model; 5 according to the Gaussian model, an energy threshold is determined,and the activity section is segmented. According to the method, the characteristic can be utilized that the sample entropy has an inhibition effect on noise, the influence of the noise on signal segmentation is overcome, and therefore the foundation is provided for precision and reliability of further analysis for the surface electromyogram signals.

The invention belongs to analysis technologies for low-content elements in alloy, and relates to an analysis method for measuring arsenic in high-chromium high-nickel steel. The method comprises: adding 5 mL-15 mL of hydrochloric acid, 3 mL-8 mL of nitric acid and 10 drops-30 drops of hydrofluoric acid, heating and dissolving a sample. According to the method, hydrofluoric acid is employed for dissolve the sample, so that a clear sample solution is obtained; by performing interference experiments, an optimum analysis spectral line is determined, and the measuring accuracy is improved; the method is wide in measure scope, the measure lower limit is 0.01%, and the measure upper limit is 0.50%; by synchronously processing the sample and preparing a high-standard solution and a low-standard solution for measuring arsenic element, the analysis error is minimum and the method is good in repeatability; the recovery rate and the precision degree are relatively good; results obtained through analysis on a standard sample, method reviewing and the like are compared and indicate that the made analysis method is good in accuracy and the method is stable and completely accords with requirements on low-content element analysis; and the method disclosed by the invention is rapid in measure and simple in operation and helps to save a large amount of manpower and material resource.

The invention belongs to the field of traditional Chinese medicine identification methodology and relates to a detection method of ginsenoside in an evodia decoction and an application thereof, specifically to an in vitro and in vivo detection method of ginsenoside and its application in the evodia decoction for treating migraine. By combination of modern HPLC and the mass spectrometric detection technology, the method has advantages of accurate result, good reproducibility and simple and fast operation, and meets requirements of biological sample analysis. With an adjuvant ginseng as the point of penetration, rat plasma pharmacokinetics of relevant components in the evodia decoction is researched, thus providing methodology reference for objectively evaluating pharmacokinetics rules of the components in human body or animal body and effects of the components in the compound prescription.

The invention discloses a method for measuring nucleotide content in a dairy product and belongs to the field of food additives and detection methods thereof. The method comprises the following steps: (1), preparing stock solutions of GMP, UMP, CMP, IMP, AMP, wherein the concentrations of the stock solutions are 1 mg/ml, and preparing into solutions with the series normal concentrations of 10.0 [mu]g/ml, 20.0 [mu]g/ml, 30.0 [mu]g/ml, 40.0 [mu]g/ml and 50.0 [mu]g/ml, wherein the sample size is 10 [mu]l, measuring the peak heights of the solutions through a liquid chromatograph and calculating a regression equation; (2), weighing 10.0 g of a sample, dissolving the sample with 20 ml of warm water, putting into an ultrasonic bath for oscillation for 10 min, then taking out, transferring into a 50-ml volumetric flask, adding acetic acid for protein precipitation, after diluting, uniformly mixing, filtering through filtering paper, filtering through a filtering membrane, and measuring the peak height of the sample through the high performance liquid chromatograph; (3), according to a standard curve equation and the peak height value of the sample, obtaining the nucleotide content in the dairy product. According to the invention, the liquid chromatography is adopted to measure the nucleotide content in an infant formula milk powder, the method is simple and convenient to operate, the measurement precision and accuracy can meet analysis requirements of the dairy product, and the method can be used as a normal inspection method.

The invention provides an open permanent magnet module which is provided with an anti-leakage structure and used for a magnetic resonance spectrum analyser, in particular to the open permanent magnet module which solves the problems that a superconducting magnet adopted by the existing magnetic resonance spectrum analysis equipment has large volume and weight and high maintenance cost. The magnetization direction of an upper cylindrical magnetic shell is gradually changed from being parallel to the vertical direction close to a C-shaped magnetic yoke upper arm to being vertical to the vertical direction; an upper magnetic core is arranged inside the upper cylindrical magnetic shell; the magnetization direction of the upper magnetic core is parallel to the vertical direction; the upper end surface of a magnetic core is arranged on the lower end surface of the upper magnetic core; the lower end surface of the magnetic pole is a convex-concave ring-shaped structure; a shim coil is arranged at the position close to the lower end surface of the magnetic pole; the structure of the lower magnet is the same with that of the upper magnet; furthermore, the lower magnet and the upper magnet are arranged symmetrically in the upper and lower direction on the lower end surface of the C-shaped magnetic yoke; the magnetization direction of the lower cylindrical magnetic shell of the lower magnet and the magnetization direction of the upper cylindrical magnetic shell are symmetric in the upper and lower direction. The magnetization direction of the lower magnetic core of the lower magnet is the same with that of the upper magnetic core.

The invention discloses a comprehensive pretreatment instrument for chemical analysis of samples. The comprehensive pretreatment instrument comprises a liquid storage part, a dilution part, a sample collection part, a neutralization part, a concentration part and a control part. The comprehensive pretreatment instrument provided by the invention can select the on-line/off-line neutralization, dilution, concentration and matrix elimination functions for the samples by controlling the switching of circuits and valves; all the functions can be used independently on line or off line, can also be combined randomly according to requirements, can convert complex samples into aqueous solution, reduce or remove interfering substances, reduce the concentration of organism, adjust the pH value, concentrate and enrich components to be measured to meet the requirements on instrument analysis, reduce the influence of complex samples on analysis results, expand the selection of analysis method, increase a response value of instrument detection, and ensure the reproducibility and accuracy of instrument test. The comprehensive pretreatment instrument provided by the invention is suitable for scientific research, medicine and hygiene, environmental protection, industrial and agricultural production, recycling of industrial wastewater and waste materials and other industries, especially the alumina industry, and is high in practicability.

The invention discloses a high-pressure aerosol detection conduit, which comprises a pipe body, a high-pressure lens and a lens cover, wherein a through part in the pipe body is used for introducing aerosol to be detected, and a lens mounting hole is formed on the upper part of the pipe body; the high-pressure lens is arranged in the lens mounting hole, the space between the high-pressure lens and the pipe body is sealed by a high pressure resistant sealant, the high-pressure lens is a high pressure resistant glass lens, and the surface of the high-pressure lens is coated with an anti-reflection film; and the lens cover is mounted in the lens mounting hole, covers the outside of the high-pressure lens and has a hole, light rays emitted by an external light source pass through the hole to detect the aerosol in the pipe. The high-pressure aerosol detection conduit can bear aerosol to be tested under a higher pressure to realize the detection of the high-pressure aerosol, and the structure of the high-pressure aerosol detection conduit is simple, and the operation of the high-pressure aerosol detection conduit is easy.

The invention discloses a VFTO spectrum analysis method based on continuous wavelet transform and hard threshold denoising, comprising the following steps of: performing continuous wavelet transform on VFTO time-domain waveform by using basic wavelet; performing hard threshold denoising on the results of the continuous wavelet transform to obtain a denoised time spectrum; and extracting amplitude-time characteristics of a specific frequency component from the time spectrum. Through the VFTO spectrum analysis method based on the continuous wavelet transform and the hard threshold denoising, theamplitude-time characteristics of the frequency components and the frequency of the VFTO are obtained, which helps the GIS designers to specifically suppress the harmful frequency components in the VFTO.

The invention discloses a method of detecting the content of lincomycin hydrochloride in a feed through a high performance liquid chromatography method. A waters 2695 high performance liquid chromatograph is employed with a C18 chromatographic column; a mobile phase includes a 0.05 mol/L borax solution and methanol according to ratio of 55:45; flow rate is 1.0 ml/min; detection wavelength is 214 nm. The method has good separation between a main peak and adjacent peaks, in the range of 14.7-492 [mu]g/ml, the lincomycin hydrochloride can form good linearity, R2 = 0.9987 (n=6). The method is quick, sensitive and reliable, can be used for content detection of the lincomycin hydrochloride in a feed additive. The LC-MS/MS method can supply structural information of a to-be-detected substance; the method is high in sensitivity and selectivity and is an excellent method of detecting various antibiotics. The method is quick, sensitive, reliable and accurate.

The invention discloses a method for solving the dynamic radar ratio of a laser radar according to real-time aerosol distribution. The method is suitable for the conditions of clear sky and few clouds. The method comprises the following steps: 1) measuring by an aerosol extinction coefficient sensor to obtain a ground actually-measured aerosol extinction coefficient [alpha]a(r0); 2) calculating a radar signal P(r0) at the ground; 3) giving a pre-estimation radar ratio suitable for the local; 4) fitting the extinction coefficients of the ground and the uniformly mixed part; 5) reversely substituting into a Fernald backward integral equation to solve the dynamic radar; 6) carrying out iteration on the inverse substitution algorithm; and 7) performing inversion to obtain a distribution profile of the extinction coefficient of the aerosol. On the basis of the Fernald method, the method for solving the dynamic radar ratio according to the real-time aerosol distribution is provided, the purpose of radar ratio localization can be achieved, the method is used for improving the precision of a laser radar inversion algorithm, and therefore the more accurate distribution profile of the aerosol extinction coefficient can be obtained.