9results about How to "Fast inversion" patented technology

The application discloses a kind of acoustic-electric tomography image imaging algorithm based on two-point gradient iterative method, and the innovation is to improve the calculation efficiency by two-point gradient iterative method, and the accuracy of image reconstruction is improved by the selection of regularization term.The core of the application is to use the characteristics of acoustic-electric hybrid imaging, that is, when the boundary detection current is applied, the power density data is obtained by using ultrasonic disturbance, so as to obtain the internal data of biological tissue.At the same time, according to the different characteristics of different biological tissue conductivity, different regularization terms are introduced, two-point gradient iterative method is established, and high-resolution reconstruction of biological tissue conductivity is realized.Compared with the traditional acoustic-electric imaging method, the application reduces the calculation and storage cost of multiple observation currents, improves the imaging efficiency.And the iteration process is modified by using a special regularization term, so that the boundaries or geometric characteristics of different tissues can be accurately determined, and the imaging accuracy is improved.

The present application relates to the technical field of complex radiation field inversion, and particularly relates to a complex radiation field inversion system and method based on a multi-layer source grid, wherein a multi-layer source grid division subsystem is used to perform multi-layer discrete approximation on a complex source term with a known position and shape to be inverted, a detector partition arrangement subsystem is used to set detectors for a radioactive source, all coarse grid volume sources and all fine grid volume sources respectively in different manners for detection, a source term inversion subsystem is used to perform inversion on source intensity distribution of the complex source term according to the radioactive source, all coarse grid volume sources, all fine grid volume sources and first, second and third measurement values, and a radiation field calculation subsystem is used to calculate the radiation field distribution of the inverted complex source term. The technical problem that the complex source cannot be inverted in the traditional inversion is overcome, and the radiation field under the complex source distribution can be quickly and accurately inverted.

The application discloses a soft soil foundation settlement prediction method based on a physical information neural network, and relates to the technical field of geotechnical engineering monitoring. Multi-source data containing settlement, displacement and pore water pressure are collected, wavelet denoising and feature screening are performed, and a high-quality data set is constructed; a forward mapping model based on finite element FEM is constructed, an improved immune genetic algorithm IGA is used to minimize errors, and accurate inversion of key mechanical parameters is realized; the mechanical parameters are embedded into a long short-term memory network LSTM, a hybrid loss function containing data fitting loss and physical limit constraint loss is constructed, and a physical information neural network PINN-LSTM is formed; the future deformation trend is predicted through the network, the safety factor is calculated in combination with the limit equilibrium theory, and hierarchical early warning and disposal suggestion pushing are realized according to a dynamic early warning threshold. The method significantly improves the physical interpretability and precision of soft soil foundation settlement prediction, and has wide application value.

The invention discloses an active inversion method of a typical deep sea sound velocity profile based on a reliable sound path, and relates to acoustic inversion of marine environment parameters. The method comprises the steps that based on ocean mode data or measured data, a sound propagation model is combined, and a sea surface scattering echo arrival pitch angle and arrival time two-dimensional curve under different deep sea sound velocity profiles is obtained through simulation; a vertical receiving array carrying an active sound source is arranged at the bottom of a deep sea, and sea surface scattering echoes obtained by active emission are subjected to beam forming to obtain actually measured sea surface scattering echo arrival pitch angle and arrival time two-dimensional curves; comparing the two curves to obtain sound velocity profile expression parameters under the optimal matching of the two-dimensional curve, and obtaining deep sea sound velocity profile estimation by using the expression parameters. And a full-water-depth sound velocity profile can be obtained without covering a measurement system of a whole water body. A traditional receiving and transmitting split double-subsurface buoy system does not need to be used for obtaining a deep sea water sound velocity profile between receiving and transmitting, and deep sea sound velocity profile estimation can be achieved by placing a single receiving and transmitting assembly on a system on the seabed.

The application discloses a kind of multi-source data fusion soil attribute collaborative inversion and management method and system, belong to wisdom agriculture and soil informatization technical field.The method is by obtaining gamma spectrometry data, optical remote sensing data and ground sensing and measured data to multi-source heterogeneous data carry out space-time registration, feature extraction and fusion modeling;Multi-task learning model is constructed to realize the collaborative inversion of soil nutrients, physical and chemical properties and biological characteristics;Introduce soil health evaluation model to carry out grading evaluation and index representation to soil health state, and generate management and control suggestion.The system includes data access and management layer, data preprocessing and feature engineering layer, collaborative inversion and model library layer and decision support and visualization layer, with the advantages of high inversion accuracy, strong adaptability and outstanding decision support capability.The application improves soil attribute inversion accuracy and regional coverage efficiency, and provides technical support for precision fertilization, soil improvement and sustainable agricultural management.

The present application relates to the technical field of oil and gas drilling engineering, and specifically discloses a multi-field coupling complex fractured formation fracture width distribution inversion method, based on the theory of porous elasticity, a drilling fluid loss model considering fluid-solid coupling effect is constructed, a roughness correction factor is introduced to correct the traditional cubic law, and the application of Darcy's law in the matrix is improved, a drilling fluid loss mathematical model coupled with the matrix and the fracture is established, through numerical simulation, the influence law of key parameters such as fluid viscosity, pressure difference and fracture width on drilling fluid loss is obtained, and on this basis, a fracture width multivariate linear regression inversion equation with fluid viscosity, pressure difference and cumulative loss as independent variables is established, the inversion equation has high prediction accuracy and practicability, can be used for quickly and accurately inverting the fracture width on site, and provides theoretical and technical support for the understanding of the loss mechanism of multi-scale fractured formation and the optimization of leakage prevention and treatment.

The patent relates to a kind of time-domain optical wave electric field measurement techniques based on vector double-pulse supercontinuum, belongs to the field of optoelectronic technology.The technology includes vector double-pulse laser configuration, nonlinear optical medium, optical signal processing unit, photoelectric conversion processing unit and other components.Pulse laser to be measured is first converted into vector double-pulse laser in the system, and is injected into nonlinear optical medium, and then obtains the optical wave electric field information of the laser to be measured after optical signal processing and photoelectric conversion processing.This technology has positive contribution to the characterization of time-domain ultrashort pulse laser.

This application discloses a device for generating Mach-Zehnder interferometry, a photothermal spectral gas sensing device based thereon, and a detection method thereof, belonging to the field of laser spectral gas sensing technology. The interferometer device sequentially includes an optical frequency comb and a first optical beam splitter in the optical transmission path. A movable-arm mirror group is provided in the optical path of one beam B, which is split into two beams by the first beam splitter. Beam B changes its path after passing through the movable-arm mirror group and intersects with the optical path of the other beam C. A beam combiner is provided at the intersection. The movable-arm mirror group is connected to a driving mechanism, which drives the movable-arm mirror group to perform linear motion, the trajectory of which is parallel to the line containing beam B. The interferometer device of this application does not require multi-heterodyne interference using a local oscillator optical comb and a signal optical comb. The downconversion factor can be directly calculated using the moving speed of the movable-arm mirror group in the Mach-Zehnder interferometer structure, mapping each longitudinal mode of the signal optical comb at the optical frequency to the radio frequency component.

The invention relates to the technical field of soil nutrient inversion, and particularly discloses a soil nutrient inversion method and system based on a gamma-ray energy spectrum full spectrum.The method comprises the steps that firstly, a gamma-ray energy spectrometer is used for measuring a target area, and full spectrum data containing characteristic peaks of natural radionuclides such as 40K, 238U and 232Th are obtained; performing energy calibration and normalization processing on the original energy spectrum, and converting a channel number into an actual energy value to form a standardized energy spectrum; the method comprises the following steps: extracting main characteristics of a spectrum shape by introducing a characteristic selection and dimension reduction algorithm, performing characteristic correction in combination with soil moisture content parameters, constructing a mapping model of energy spectrum characteristics and soil nutrient content, and realizing rapid inversion of main nutrients such as nitrogen, phosphorus, potassium, organic matters, pH and the like; compared with a traditional chemical analysis or single-point spectrum inversion method, the method provided by the invention can make full use of energy spectrum full information, improves the inversion efficiency and precision, realizes rapid, lossless and spatial estimation of soil nutrients, and provides technical support for precise fertilization and cultivated land quality monitoring.