105results about How to "Improve analytical precision" patented technology

The invention provides a coaxial rigid rotor coupling pneumatic elastic response analysis method, and belongs to a helicopter kinetic analysis technology. The method is characterized in that according to the operation and control characteristics of a coaxial rigid rotor helicopter, a balance equation optimization solution method is built, and an optimization solution is found according to the given target and constraint conditions. According to the characteristic of complicated coaxial rigid rotor flow field environment, a rotor flow field is calculated by using a computational fluid dynamic method based on an Euler/N-S equation; and then, the coupling pneumatic elastic response is calculated by using a computational fluid dynamic/computational structural dynamic loose coupling analysis method. The coaxial rigid rotor coupling pneumatic elastic analysis method has the advantage that when the analysis method is used, balance operation and control parameters, blade response, rotor loads and the like of the coaxial rigid rotor helicopter can be calculated. The method has good analysis precision and engineering applicability; the relying of the development process on the test can be reduced; and the design period and the development cost can be greatly reduced.

The invention discloses an efficient multi-objective optimization method for a satellite constellation and belongs to the field of constellation system of a spacecraft. The method comprises the stepsof determining an initial condition based on a Walker-delta constellation configuration, and establishing a constellation orbit kinetic equation, an earth coverage analysis module and an earth observation resolution model; optimizing an earth orbit height, an orbital inclination and an ascending node right ascension with a coverage percentage and a ground pixel resolution by use of a sequential radial basis function multi-objective optimization strategy; and constructing an objective function based on l2 weighting and an improved Pareto fitness function, replacing a high time-consuming constellation performance simulation model with an RBF (Radial Basis Function) agent model to optimize design, and updating and managing the RBF agent model through sequence sampling in an interest interval.Therefore, a Pareto non-inferior solution set satisfying engineering requirements is acquired as a satellite constellation design scheme, the coverage percentage of a constellation for a target observation region is realized as high as possible, the pixel resolution of an effective load is realized as low as possible, the calculation cost and the design cost of the satellite constellation are reduced, and the Pareto leading edge search capability is improved.

The invention relates to a geostationary orbit spacecraft electrical propulsion transfer track control method. The method comprises the following steps: determining initial conditions, a carrier rocket transmitting a geostationary orbit spacecraft to a first initial orbit, and determining a Kepler radical of the first initial orbit; establishing a first initial orbit kinetic equation by means of the Kepler radical, reducing the orbit inclination angle of the first initial orbit through a thrust azimuth alpha and performing rounding to obtain a second initial orbit, and obtaining transfer time tf1 and a propellant consumption amount mfuel1; fixing a thrust accelerated speed in a second preset plane, transferring the second initial orbit through a thrust azimuth beta to a geostationary orbit, and obtaining transfer time tf2 and a propellant consumption amount mfuel2; calculating total time tf=tf1+tf2 of a geostationary orbit transfer process and a propellant consumption amount of the transfer process; and by taking minimization of the geostationary orbit total time tf as a design object, optimizing the thrust azimuth alpha at a first initial orbit phase to obtain an optimal geostationary orbit transferring scheme.

The invention discloses a satellite constellation system multidisciplinary design optimization method based on an agent model, and belongs to the field of spacecraft constellation application. The method comprises the steps of on the basis of the Walker-delta constellation configuration and a small-sized earth observation satellite structure, establishing a key subject analysis model of the satellite constellation system by comprehensively considering the design requirements of the constellation configuration and a satellite subsystem; adopting a sequence radial basis function based on a support vector machine and a discrete-continuous variable sampling method and taking the satellite constellation system mass as an objective function to optimize a preselected design variable; mapping thediscrete variables in a continuous space through a discrete-continuous variable sampling method; replacing an original analysis model with an RBF agent model; identifying an interest interval by adopting an SVM (support vector machine), and performing sequence sampling in the interval to update and manage an RBF agent model, so that a design scheme which meets the requirements of constellation configuration and a satellite subsystem and has the minimum total mass of the satellite constellation system is efficiently obtained, the calculation cost of the satellite constellation system is furtherreduced, and the optimization efficiency is improved.

The invention discloses a solar radiation temperature effect analysis method and system of a civil engineering structure. The method comprises the following steps: a geographical longitude and a latitude of a position where the structure is disposed are determined, and through installing a sensing apparatus on the structure, an ambient air temperature and a surface wind speed of the structure are measured. By use of a structure solar radiation model, direct radiation intensity, scattering intensity and reflection intensity acting on the surface of the structure are calculated and determined. According to solar radiation intensity of the structure surface, dynamic temperature boundary conditions are established, by use of a finite-element method, a three-dimensional thermal conduction equation of the structure is solved, and a dynamic temperature effect of any one point at the surface of the civil engineering structure or inside the structure can be determined. The method and system are applied to temperature effect analysis and evaluation of various different types of civil engineering structures under a solar radiation effect, and are particularly applied to analysis evaluation of a temperature effect of a structure with a quite small geometric dimension and a structure with complex shielding around.

The present invention discloses an convergence RLC circuit model-based method for analyzing subsynchronous resonance in a power system. The method comprises the following steps of: establishing a power plant model and a series compensated transmission line system model so as to acquire a non-linear differential equation model of each subsystem; generating a state equation model according to a parameter under a particular working condition and the non-linear differential equation model; generating an algebraic equation model according to the Laplace transform and the state equation model; acquiring a final equivalent resistance model so as to acquire a series resonance point; aggregating the final equivalent resistance model into an equivalent second order RLC electric circuit model according to the series resonance point; and quantifying SSR analysis. According to the analysis method provided by an embodiment of the present invention, the final equivalent resistance model is aggregated into the equivalent second order RLC electric circuit model, so that the SSR analysis is quantified, thus implementing the accurate quantification evaluation of SSR, reducing analysis errors and improving analysis accuracy.

The present invention relates to complexes of oligonucleotide-encoded libraries and methods of tagging and using such libraries. In particular, the oligonucleotides and methods can include complexes having at least one linkage for which a polymerase has reduced ability to read or translocate through.

The invention discloses an analysis method and device for application uninstalling information, relates to the field of information technology and mainly aims to solve the problem that application uninstalling caused by crash cannot be effectively analyzed, and consequently the analysis precision of the application uninstalling information is low. The method comprises the steps that according to identification information of terminal equipment where an application crashes and identification information of terminal equipment where the application is uninstalled, terminal equipment where the application is uninstalled due to crash is determined, and statistics is performed on the quantity of the terminal equipment where the application is uninstalled due to crash and the quantity of the terminal equipment where the application is uninstalled; the crack uninstalling rate corresponding to the application is calculated according to the quantity of the terminal equipment where the application is uninstalled due to crash of the application and the quantity of the terminal equipment where the application is uninstalled. The analysis method and device are applicable for analysis of the application uninstalling information.

A system for inspecting components by evaluating the degree of accuracy of component attribute information provided by third parties, wherein a performance unit for performing the evaluation of the component attribute information comprises a unit for extracting components similar to target components; a unit for determining the abnormality of component attribute information when the component attribute information can take limited kinds of values; a unit for determining the degree of the abnormality of the component attribute information when the component attribute information can take unlimited kinds of values; and a unit for sorting the components in the order of descending degree of abnormality of the component attribute information to clarify the reason for the evaluation result.

An object of the present invention is to provide a method and an apparatus by which PCBs in insulating oil can be analyzed with high accuracy in a convenient, inexpensive, and rapid manner. The method for analyzing polychlorobiphenyls by measuring the concentration of polychlorobiphenyls in insulating oil comprises a step of, as pretreatment, bringing particles of a copolymer that contains divinylbenzene and a methacrylate organic monomer as monomer components into contact with insulating oil containing polychlorobiphenyls, so as to separate polychlorobiphenyls in insulating oil from oil content that is an impurity. The methacrylate organic monomer preferably has a diol type hydroxyl group.

The invention discloses a harmonious wave detecting method in a power system. On the basis of five-layered db 40 wavelet packet transformation, hilbert transform is applied to perform frequency shift operation; every harmonic component is transferred to a side frequency band with relatively high precision, so as to perform wavelet packet decomposition and signal reconstruction, thus the high-precision detection of every harmonic wave is realized. The method includes steps of S01, moving every frequency classification of a former signal to 25-75 Hz frequency sections by hilbert transform; S02, respectively performing wavelet packet decomposition and reconstruction on every component after moving frequency; S03, respectively moving frequency of every restructured component and restoring to original frequency section; S04, acquiring the harmonious wave detecting result according to the recorded waveform data. The method provided by the invention eliminates the adverse influence of wavelet filter aliasing of the middle frequency section on the detecting precision, and has high-resolution time frequency analysis ability, and can effectively position the transient state disturbance; the detecting precision is high and the instantaneity is good; the method is applicable to various occasions of harmonious wave detection.

The invention provides a carbonate coupling isotope preparation device. The preparation device enables continuous injection of multiple samples in a closed environment, and the sample introduction environment and the preparation process can effectively avoid the interference of carbon dioxide gas containing <13>C<18>O<16>O generated by the sample by carbon dioxide in air. The invention further provides a detection method of the carbonate coupling isotope, wherein the preparation of carbon dioxide gas containing <13>C<18>O<16>O using the carbonate coupling isotope preparation device, and the abundance of elements is detected; and the application of the preparation device in carbonate coupling isotope detection is also provided.

Electron beam equipment fitted with a field emission electron gun (FEG) having an extractor electrode, an acceleration electrode, a repeller electrode disposed between the extractor electrode and the acceleration electrode, and a repeller power supply for applying a given voltage to the repeller electrode. Electrons extracted from the emitter collide against the extractor electrode, producing secondary electrons moving toward the acceleration electrode. The secondary electrons are repelled by the repeller electrode and thus prevented from reaching the specimen.

The invention discloses a portable laser probe component analyzer, which comprises a detection head and a host system. The detection head consists of a shell, an optical fiber collimating mirror and a lens. The host system includes a microcontroller, a portable PC machine, a laser power supply, a spectrometer, a light collector, a dichroic mirror, an optical fiber coupler, a diaphragm and a laser emission head. The laser pulse and collected light are all transmitted through one same optical fiber, thus avoiding a complex optical path system, reducing the detection head volume of the laser probe component analyzer, and enhancing the anti-interference performance and repeatability of the system. By adopting dual pulse excitation, the detection limit can be well reduced, and the signal-to-background ratio and the plasma spectrum stability can be improved. At the same time, small energy laser pulse with a pulse energy of 10-20mJ is employed to excite a sample and improve the analysis accuracy, and large damage to the sample surface can be avoided simultaneously. Upper computer software is employed to control a small displacement platform to realize automated focusing and collection.

The invention provides a liquid-state in-situ corrosion fatigue device and a testing method. The device comprises a panel, a side plate, a guide pipe, a fixed platform and a sealing part. The liquid-state in-situ corrosion fatigue device has the advantages that a flow speed of a corrosion solution can be adjusted through changing the power of a submersible pump. The liquid-state in-situ corrosionfatigue device has good sealing performance, can be repeatedly utilized for long time, has certain corrosion resistance and has certain tolerance on inorganic acid and alkali type corrosion media; theliquid-state in-situ corrosion fatigue device is low in cost, simple in structure and easy to process and assemble; the testing method provided by the invention is combined, and a test sample can bemonitored in real time in a liquid in-situ corrosion fatigue experiment process. The testing method can be used for eliminating influences, caused by the corrosion solution, on DIC (Density IndicatingController) information acquisition quality; good analysis precision can be ensured. The testing method is simple in steps and is easy to operate.

The invention relates to an electronic probe analysis method for testing trace elements Na, K, P, S and Ni of lunar glass beads. The method comprises the following steps of: preparing a sample; selecting a proper glass standard sample; determining characteristic X-rays for testing Na, K, P, S and Ni elements; determining test voltage; determining current and beam spot conditions; determining an analysis spectrometer and a crystal; determining peak position test time of each element; determining characteristic X-ray peak positions and backgrounds of the Na, K, P and Ni elements in the glass standard sample; determining the peak position and background of the S element in the glass standard sample; correcting an overlapping peak; testing the components of the glass standard sample; and testing the components of a moon glass bead to be tested. The trace elements in the lunar glass are analyzed by optimizing the electronic probe analysis method, the accuracy (reproducibility) is high, the content change of the trace elements is within +/-10%, and the damage to the lunar glass beads caused by an electronic probe is effectively reduced.

The invention provides a Raman spectrum detection optical path device. The Raman spectrum detection optical path device includes a light source assembly, which is used to emit excitation light on the object to be detected and generate a Raman spectrum; a lens, which is used to collect the Raman spectrum generated when the light source assembly is irradiated on the object to be detected, and convert the resulting The Raman spectrum is focused into a light spot; an optical fiber, one end of the optical fiber is distributed in a cylindrical shape, and the other end is distributed in a flat shape. The cylindrical end of the optical fiber is used to collect the light spot focused by the lens, and the flat end of the optical fiber is It is used to arrange the light spots into narrow strips of light and output them; grating and photodetector. The invention also provides a detection method of the Raman spectrum detection optical path device. The Raman spectrum detection optical path device and detection method of the present invention design one end of the optical fiber into a cylindrical shape and the other end into a flat shape, thereby arranging the focused light spots into narrow strips of light to achieve high-magnification focusing and improve detection of weak Raman Spectral detection capabilities.

The invention relates to a method for measuring arsenic in sulfate slag. An aqua regia sample is adopted and the method comprises the following steps of: weighing pure iron equivalent to iron in the sample in quantity, performing matrix matching by adopting iron base, preparing standard solution of a working curve with effectively eliminating the base interference of the iron base, selecting an analysis spectral line of the arsenic in the sulfate slag by using the conventional inductive coupling plasma spectrograph in a control laboratory, measuring the working curve and the spectral intensity of the arsenic in the test solution on the inductive coupling plasma emitting spectrograph, and directly obtaining the analysis result of the sample by automatic regression calculation of a computer. The method solves the problems of fussy operating process of sample dissolution, absorption and color comparison in the conventional method, poor analysis and operation of high content arsenic and lower analysis result.

Disclosed are a joint data analysis method, device and system, and a computer readable storage medium, the method comprises the following steps that a demand initiator generates an ID packet sample set according to a model, and a data provider uses a secure computing environment to establish a mirror image equivalence model according to the ID packet sample set, and the demand initiator can analyze the sample by using the model obtained by joint calculation of the data provider to obtain an analysis result, i.e., the analysis result is directly used, or the original model is improved accordingto the equivalent model. Features associated with multiple parties are obtained through the mirror image equivalent model, the analysis dimension is expanded under the condition of no mutual data leakage, and the analysis accuracy is improved.