134results about How to "Simplify analysis steps" patented technology

The invention provides a test method of the sulphate content of desulfurization gypsum, comprising the following steps: 3-5 grams of gypsum samples are taken to be heated and dried for 30-60 minutes in a baking oven with the temperature of 42-48 DEG C and then placed into a drier to be cooled to room temperature and weighed by a 1/10000 level balance, the gypsum samples are repeatedly heated and weighed till the gypsum samples have constant weight, and the weight W (g) of the gypsum samples is recorded; the gypsum samples are placed back to the baking oven to be heated and dried for 30-60 minutes under the temperature of 350-370 DEG C and then placed into the drier to be cooled to the room temperature and weighed by the 1/10000 level balance, the gypsum samples are repeatedly heated and weighed till the gypsum samples have constant weight, and the weight W1 (g) of the gypsum samples is recorded; the computation of the crystallization water content of the gypsum samples is as follows: the crystallization water content X(%)=(W-W1)*100/W, and the computation of the sulphate content of the gypsum samples is as follows: the sulphate content is indicated by calcium sulphate dehydrate content, CaSO4.2H2O(%)=X*100/20.9275. The method is simple, convenient and fast; and in addition, compared with the prior art, the invention greatly enhances the analysis speed, simplifies the analysis steps and decreases the experimental apparatus.

The invention belongs to the technical field of design of aircrafts, and relates to a method for designing the fatigue life of aircraft bolts. The method for designing the fatigue life of the aircraft bolts is provided according to the stress characteristics of the bolts and from the field of researching of fatigue damage tolerance. The method for designing the fatigue life of the aircraft bolts is correct in used theoretical basis and clear and simple in analyzing step, and computer automatic iterative computations are convenient to carry out in the computing process. The method for designing the fatigue life of the aircraft bolts solves the problem that the influences on the fatigue life of the bolts by tensile stress and shearing stress need to be taken into consideration when the fatigue life of the bolts is designed. According to the method for designing the fatigue life of the aircraft bolts, the tensile stress and the shearing stress of the bolts are calculated according to the loading characteristics of the bolts, then the tensile stress and the shearing stress borne by the bolts are converted into equivalent tensile force based on the fourth strength theory, the inherent performance DFR value of the bolts is calculated according to the self structural characteristics of the bolts, and lastly the bolts are designed by adopting the detail fatigue rated value (DFR) method.

The invention relates to an airplane suspension joint structure fatigue test design method comprising the following steps: 1, building a whole-aircraft finite element model and carrying out whole-aircraft solution; 2, carrying out load distribution according to each flange rigidity proportion so as to obtain the load of each flange, and simplifying a testpiece structure form; 3, building a local detail model and carrying out calculation solution; 4, obtaining fatigue margin of a test zone and a transition segment; 5, enhancing the rigidity of the transition segment structure according to the obtained fatigue margin; 6, determining transition segment length L1 and L2; 7, loading according to a preset cycle sequence and cycle frequency so as to carry out fatigue tests. The airplane suspension joint structure fatigue test design method is based on the features that the airplane suspension joint structure is complex in jointing, more in transfer lines, and hard to design tests; the airplane suspension joint structure fatigue test design method can provide loads and load distribution rules of joints and each bolt, thus finally determining a testpiece structure form and loading scheme.

The invention discloses a preparation method of a graphene oxide/alpha fetoprotein aptamer electrochemical sensor. The preparation method comprises the following steps: taking carboxylated graphene oxide as a substrate, grafting an aminated alpha fetoprotein aptamer chain on the substrate through carbodiimide reaction, then modifying the obtained compound on an electrode, closing a non-specific adsorption site on the modified electrode with bovine serum albumin, so that a graphene oxide/alpha fetoprotein aptamer electrochemical sensing interface is formed; and taking the modified electrode as a working electrode, and investigating variation, caused by alpha fetoprotein solution with different concentrations, of an impedance signal on the sensing interface by adopting an impedance method. Compared with an existing alpha fetoprotein detection method, the preparation method has the advantages that an alpha fetoprotein aptamer is adopted for analyzing a target protein, harms such as redundant multiple labeling operation, radiation and pollution do not exist, and the sensor has the advantages of high sensitivity, good selectivity, simplicity in preparation, high analysis speed, mild reaction conditions, low preparation cost and the like.

The invention discloses a method used for simultaneously analyzing 20 types of amino acids in tobaccos and tobacco products, adopts the coupling of liquid chromatogram and electrospray tandem mass spectrum, and comprises the following experimental steps: a tobacco sample is preprocessed, extracting solution is obtained and eluted with binary flow phase gradient on a reversed phase chromatography column, two standard curves are produced, and liquid chromatogram-electrospray ion trap tandem mass spectrometry is adopted for analyzing and detecting the 20 types of amino acids in the tobaccos under a positive ion mode. The sampling of the tobacco sample is directly implemented after extraction and filtration and other preprocessing steps including derivation and solid phase extraction are avoided in the method of the invention, thus providing simplicity, convenience and fastness; the method has lowered chromatogram separable degree requirement of detected objects, can effectively and simultaneously solve the co-flow problem and the separated detection problem of amino acid isomers, builds a quickly simultaneous analyzing method of the 20 types of non-derivatized amino acids in the tobaccos, has good reproducibility, high sensitivity and selectivity, greatly simplifies analyzing steps, raises analyzing efficiency, and can be successfully applied into the analytic determination of the amino acids in various tobacco samples.

The invention discloses a circuit breaker fault diagnosis method based on a Hilbert-Huang transform algorithm. Empirical mode decomposition (EMD) is carried out on data signals, through the EMD on the signals, each intrinsic mode function (IMF) component is obtained, Hilbert transform is carried out on each IMF component, instantaneous amplitude and instantaneous frequency parameters are obtained, the amplitude and the instantaneous frequency are drawn to a Hilbert spectrum of energy, frequency and time distribution, the Hilbert spectrum is applied to analysis of nonlinear and nonstationary series, and a mirror extension method is adopted to suppress Hilbert transform endpoint effects. The testing result proves that the method has flexibility and effectiveness in vibration monitoring and analysis on the power system circuit breaker, the EMD is used for decomposing the signals to n IMF components, different frequency components in the vibration signal are in the decomposed IMF component, the frequency distribution in the IMF2 just contains a basic frequency part of a disconnecting switch, the analysis precision is improved, and the analysis steps are simplified.

The invention discloses an evaluation method and an analysis model for the vitality vulnerability of a large surface warship. The evaluation method comprises the following steps: determining the typeof a current incoming attack weapon according to explosion conditions of the incoming attack weapon; determining hitting positions of the incoming attack weapons of all types and corresponding damageload types according to the incoming attack weapons of corresponding types; determining corresponding damage load values according to the hitting positions of the incoming attack weapons of all the types and the corresponding damage load types; according to all the damage load values, analyzing the vitality vulnerability of the large surface warship and establishing ship structures and main powerequipment corresponding to different damage loads as well as a damage model of the electronic equipment; determining a damage coupling relationship between the structures and equipment according to alogical relation between the ship structures and ship equipment; determining the vitality vulnerability condition of the large surface warship according to the damage coupling relationship between thestructures and equipment and the ship structures and main power equipment corresponding to the different damage loads as well as the damage model of the electronic equipment, thereby simplifying analysis steps.

The invention discloses a voltage optimization method of an electric-field coupling type wireless charging technology of an electromobile, and relates to the technical field of electric-field couplingtype wireless charging. A direct current power supply, a high-frequency inverter, a primary edge compensation structure, a coupling structure, a secondary edge compensation structure, a high-frequency rectifier and a load which are successively connected are involved. The coupling structure comprises a simulation ground, a simulation electromobile shell and a coupling pole plate set, the couplingpole plate set comprises two transmitting pole plates and two receiving pole plates, and every two of the transmitting pole plates, the receiving pole plates, the simulation ground and the simulationelectromobile shell form a capacitor. The method comprises the steps that firstly, parameters, input voltages, output voltages and output powers of all the capacitors among the pole plates in the system are determined, then the system frequency v is selected, the system frequency v is compared with the lowest system frequency fmin obtained from calculation of the parameters, the system frequencyv is determined, inductance values of all transmitting coils and receiving coils are calculated, and based on the calculated inductance values, the transmitting coils and the receiving coils are manufactured to construct a CPT system circuit.

The invention discloses a method for testing content of galactooligosaccharide, and in particular relates to a method for testing content of galactooligosaccharide in formula milk powder by means of gas chromatography-mass spectrum. The method comprises the following steps: extracting galactooligosaccharide and lactose from samples to be detected by using hot phosphate buffer liquid; hydrolyzing and centrifuging galactooligosaccharide in extracting liquid by using beta-galactosidase to obtain liquid supernatant; enabling the liquid supernatant to pass through a microfiltration membrane; carrying out nitrogen blowing or performing low-temperature vacuum drying; deriving by using BSTFA and making up to the volume by using acetone. The content of dissociative galactose and lactose in extracting raw liquid and the total quantity of galactooligosaccharide obtained by enzymolysis on decomposition liquid and galactose released by lactose are tested by utilizing a gas phase-mass spectrum combined method, and the content of the galactooligosaccharide in samples is calculated by using the content of galactose content obtained by performing enzymolysis on decomposition liquid to substract the content of galactose obtained by extracting the raw liquid and the content of galactose produced by lactase enzymolysis. The content of galactooligosaccharide in the milk powder is detected by using the method, and the method has the advantages of extremely-low detection and high sensitivity.

The invention relates to the technical field of biomedicine, and in particular relates to a method and prediction model for detecting the tumour mutation burden. The method comprises the following steps of: S1, performing DNA extraction on tumour tissue and blood samples to be detected; S2, for tumour-related genes, constructing a target region targeted capture sequencing library; S3, obtaining original offline data by utilizing a high-throughput sequencing platform; and S4, obtaining the tumour mutation burden of the sample through a check-out process. The invention aims to provide the methodand prediction model for detecting the tumour mutation burden. Gene mutation is detected and calculated through the method and the prediction method; the method can achieve the same result as TMB detection by whole exon sequencing; and thus, the evaluation accuracy of high tumour mutation burden can be improved.

The invention provides a two-optical-path cuvette structure. Data analysis of a 10MM optical path and data analysis of a 2MM optical path can be finished in the same cuvette, so that the cuvette is high in generality, analysis steps are simple, and testing time is shortened. The two-optical-path cuvette structure comprises a cuvette body and an upper cover, and the upper cover covers the inner edge surface of the cuvette body. The two-optical-path cuvette structure is characterized in that a cavity of the cuvette body has a lower narrow strip structure and an upper wide opening structure; the upper end of the lower narrow strip structure smoothly transits to the lower end of the upper wide opening structure; the width of the inner cavity of the lower narrow strip structure is 10MM, and the thickness of the inner cavity of the lower narrow strip structure is 2MM; the thickness of the inner cavity of the upper wide opening structure is 10MM, and the width of the inner cavity of the upper wide opening structure is 10MM; a surface, which corresponds to the 2MM thickness of the lower narrow strip structure, of the cuvette body is a light passing surface; and a light transmitting surface of the light passing surface of the cuvette body has an inwards concave transparent structure, is higher than the lower narrow strip structure, and extends to the upper wide opening structure.

The invention discloses a core-shell rhodamine 6G molecularly imprinted solid phase extraction magnetic material, and a preparation method and application thereof. According to the molecularly imprinted solid phase extraction magnetic material, surface-aminated Fe3O4 nano-particles serve as a magnetic core, and a rhodamine 6G molecularly imprinted polymer membrane serves as a shell. The core-shell rhodamine 6G molecularly imprinted solid phase extraction magnetic material has a memory function for a three-dimensional structure of rhodamine 6G molecules, and rhodamine 6G can be specifically and selectively separated and enriched. The core-shell rhodamine 6G molecularly imprinted solid phase extraction magnetic material is applied to selective adsorption and dynamic extraction and separation of a trace amount of rhodamine 6G in the food sample analysis pretreatment; the rhodamine 6G can be quickly separated and detected; according to the method, the recovery rate is high and the relative standard deviation is small; the core-shell rhodamine 6G molecularly imprinted solid phase extraction magnetic material has the characteristics of small using amount of organic solvents, simplicity, quickness and high efficiency in operation, and the like.

The invention discloses a method for evaluating the residual life of an aircraft, which comprises: on the basis of a full-aircraft fatigue test load spectrum, determining a reference equivalent damage rate (equivalent damage per flight hour) for single-aircraft damage calculation by adopting a damage analogy calculation method; and then, on the basis of the load flight parameter process of any aircraft, determining equivalent damage of any aircraft, and rapidly evaluating and giving the consumption life and the residual life of the single aircraft. The method needs few parameters, is convenient to use, can be used for quickly determining the remaining life of the airplane, and can be further used for monitoring the service life of the single airplane and the structural health.

The invention provides a mesh combination method for acquiring sneak circuits in power electronic converters. Circuit topography of a power electronic converter is regarded as being composed of a plurality of independent meshes, the meshes are subjected to combination operation to obtain all sub-circuits in the converter, the sub-circuits invalid are eliminated according to the basic principle of circuit and the operating principle of power electronic converters, the sub-circuits remaining are in valid operating modes, the valid operating modes are combined to obtain all operating modes according to on and off rules of switch elements in the converter, and the sub-circuit in the mode different from the normal operating nodes is regarded as a sneak circuit, and accordingly the potential circuit in the power electronic converter is obtained. The method has the advantages that the analysis process of sneak circuit is simplified, analysis results are more complete, and no sneak circuit is missed; the method is applicable to the search of sneak circuits in various power electronic converters.

The invention relates to a structure design method for a guiding type rotary steering drilling tool, and the method comprises the following steps: 1) a mandrel in the guiding type rotary steering drilling tool is considered as an overhanging beam, a lower bearing is used as a hinge, an upper bearing is used as a sliding hinge, and the force applied by an offset mechanism to the mandrel is taken as concentrated load; 2) a rectangular coordinate system of the overhanging beam is established: the lower bearing is taken as the origin point, the axial direction of a well is taken as the X axis direction, the positive direction points at the support point of the upper support bearing opposite to the mandrel from the origin point along the X axis, the Y axis goes through the origin point, and the positive direction of the Y axis is opposite to the direction of the concentrated load; 3) the structural mechanics equation of the overhanging beam is obtained on the basis of the hypothesis and the established rectangular coordinate system. The research thought provided by the invention provides design theoretical basis for controlling the well track by the drilling tool.

The invention discloses a determination method of the cation exchange capacity in soil. An ammonium acetate solution for air-dried soil sample is dissolved, uniform mixing is performed, a centrifugal machine is used for conducting centrifuging, and a supernate is taken; the ammonium acetate solution is used for repeated treatment; ethyl alcohol is added into lower-layer slurry, uniform mixing is performed, then the centrifugal machine is used for conducting centrifuging, the ethanol solution is removed, and the ethyl alcohol is used for repeated washing; after collection is performed, wax and magnesium oxide are added, distillation treatment is performed, a Nessler reagent is used for inspecting whether distillation is complete or not, a methyl red-bromocresol green mixing indication agent is added dropwise, and the hydrochloric acid standard solution is used for titration. According to the determination method, traditional methods are improved, the pretreatment and analysis steps are simplified, the sample treatment operation is more accurate in the whole determination process, and therefore the determination result is more accurate. The method has the advantages of being easy and convenient to operate, rapid, accurate and high in accuracy.

The invention relates to a method for determining the content of calcium in a nickel-calcium alloy by adopting a fluorescence titrimetric method and belongs to the technical field of chemical analysis. The method comprises the following steps: weighing raw material, dissolving, filtering, adjusting by a reagent and titrating to determine the content of the calcium in the nickel-calcium alloy. According to the method for determining the content of the calcium in the nickel-calcium alloy by adopting the fluorescence titrimetric method, a range of quantitatively detecting the content of the metal calcium in a nickel-calcium alloy test sample is 4 percent to 15 percent. A beaker containing a test solution is filled into a black barrel and a complete black packaging background is provided for the whole test solution, so that a green fluorescence color of the whole test solution is clear and consistent; the two black barrels can move up and down, so that testers can conveniently put in or take out beakers with different volumes; observation windows, which have the same size and are overlapped, are formed in side faces of the used black barrels so that the testers can conveniently observe. In a fluorescence titration process, a small quantity of iron ions in the solution can be separated in a manner of forming sediment or adding a screening agent for screening. By adopting the fluorescence titrimetric method, an analysis period is greatly shortened and analysis steps are simplified; meanwhile, the precision and accuracy of the detection method are improved.

The invention discloses an on-orbit health determination method suitable for medium and high orbit satellite-borne strong magnetic field output equipment. The method comprises the following steps: selecting magnetic sensitive equipment as a reference object according to the principle that the magnetic sensitive equipment is closest to strong magnetic field output equipment, and selecting performance indexes influenced by a magnetic field as research parameters according to the working principle of the magnetic sensitive equipment; in a satellite ground magnetic test, sequentially arranging strong magnetic field output devices in different directions of the whole satellite to be powered up; acquiring a magnetic field measurement value and an electrical performance index remote measurement value of the magnetic sensitive equipment under the working condition, and identifying a main magnetic field source at the position of the magnetic sensitive equipment; taking the magnetic field intensity and the electrical performance index at the position of the magnetic sensitive equipment as input parameters, and establishing a numerical model for describing the relationship between the two parameters by adopting a fitting method; selecting a satellite on-orbit working mode corresponding to the ground test working condition, substituting the on-orbit telemetry value of the electrical performance index of the magnetic sensitive equipment into the established numerical model, subtracting the on-orbit error term, and performing calculating to obtain the on-orbit magnetic field characteristic index of the evaluated strong magnetic field output equipment; and comparing the difference between the on-orbit magnetic moment calculation value of the high-intensity magnetic field output equipment and the performance index of the equipment to determine the on-orbit health state of the equipment.