42 results about "Diffusion field" patented technology

The invention relates to the technical field of intelligent inspection, in particular to a pipeline inspection abnormal hidden danger intelligent identification system based on an unmanned aerial vehicle. According to the invention, the three-dimensional grid construction is carried out on the data collected by the unmanned aerial vehicle in the inspection process, so that the space division of the inspection area is realized, and the detection of the gas pipeline has higher precision. In combination with hyperspectral data analysis, measurement of methane concentration can be accurately mapped to space grid points, interference of environmental factors is reduced, and preliminary recognition accuracy of a leakage area is improved. On the basis of local concentration gradient calculation, through a data smoothing and diffusion optimization method, the boundary of a leakage area is clearer, interference of environmental noise is eliminated, meanwhile, the concentration value is dynamically adjusted, and the adaptive capacity to the change trend of leakage points is enhanced. By means of the construction of the virtual diffusion field and in combination with the space occupation condition of terrain obstacles, the analysis of the gas flow path is more accurate, and the problem of misjudgment caused by terrain complexity is solved.

The invention provides a semiconductor chip defect detection positioning method and system, and relates to the technical field of semiconductor chip detection, and the method comprises the steps: obtaining an original image and electrical test data; forming a defect candidate area based on local density analysis; variational mode decomposition is carried out on the electrical data, and electrical characteristic abnormal points are marked; mapping the image features to an electrical characteristic space and calculating mutual information values to determine defect points; and calculating the distribution and path of a diffusion field and determining the severity of the defect. According to the invention, accurate positioning and severity evaluation of chip defects are realized, and the detection efficiency and accuracy are improved.

The invention relates to the technical field of optical elements, and discloses a fog display point diffusion optical system and a preparation method thereof, and the preparation method comprises the steps: obtaining user visual parameters, and building a visual behavior probability density model through kernel density estimation; designing the front surface of the lens based on the model, and generating an asymmetric defocus system coupled with a gazing habit; the rear surface of the lens is designed, and the distribution density of a fog display point diffusion unit is cooperatively modulated by the front surface defocusing amount, the fixation probability and the pupil diameter; and finally integrating front and rear surface design to form an optical lens body. According to the method, the asymmetric defocus field on the front surface and the fog display point diffusion field on the rear surface are subjected to collaborative design, and the defocus intensity and the contrast modulation intensity are accurately applied to the effective retina area of the user through the visual behavior probability density model; the technical problem that a traditional out-of-focus lens is fixed in signal and cannot adapt to individual staring habits and physiological parameter changes is solved.

The invention provides a real-time monitoring method and system for the construction quality of a jet grouting pile and a storage medium, and relates to the technical field of the construction quality of the jet grouting pile. Pressure sensors, flow sensors and micro-seismic sensors are arranged at an outlet of a jet grouting pile pipeline and a drill bit, multi-dimensional time sequence data with the high signal-to-noise ratio are collected, self-adaptive filtering and drifting correction are conducted, and the real-time monitoring of the construction quality of the jet grouting pile is achieved. Generating a dynamic trajectory based on Takens phase space reconstruction, calculating a rheological entropy and constructing a four-dimensional space-time diffusion field; after the field is projected to a construction plane, an underground karst cave network model is continuously corrected by utilizing Bayesian updating, multi-stage early warning is triggered in a quantitative and graded manner according to an entropy value and a filling rate, and a filling quality thermodynamic diagram is generated, so that high-precision, dynamic and visual monitoring and guidance of a slurry diffusion process are realized.

The invention provides a nuclear radiation diffusion analysis method based on a Gaussian mixture atmospheric diffusion model. The method comprises the steps that nuclear facility source item parameters are acquired; integrating meteorological, geography, remote sensing and radiation monitoring data by using a heterogeneous data fusion engine, extracting atmospheric turbulence, terrain and building interference characteristics and source item parameters, and forming a dynamic input parameter set; constructing an unsteady state diffusion model containing a multi-modal distribution function, processing features, obtaining a mixed distribution model, and correcting the mixed distribution model; predicting spatial and temporal distribution of radiation pollutants, and generating multi-scale diffusion field simulation; and optimizing a diffusion path, and generating a three-dimensional risk field. According to the method, multi-source data are integrated, an unsteady state diffusion model is constructed, Gaussian component weights are dynamically adjusted, the model is corrected by using real-time data, and a geographic information system is coupled to carry out spatial constraint optimization. And through multi-scale feature coupling, dynamic parameter adjustment and geographic space constraint correction, the depicting capability of the atmospheric diffusion model is remarkably improved, and the nuclear radiation diffusion prediction precision is greatly improved.

The invention provides an urban traffic ubiquitous perception method based on a federal aided large model, and belongs to the technical field of data processing, and the method specifically comprises the steps: 1, building a space-time diffusion field based on multi-source heterogeneous traffic data of a target city, and dynamically dividing traffic perception subtasks according to the space-time diffusion field, and obtaining a subtask set; 2, scene training is carried out according to each traffic perception sub-task in the sub-task set based on federated learning, and a traffic perception sub-model corresponding to each traffic perception sub-task is obtained; and step 3, performing hierarchical aggregation and splicing on all the traffic perception sub-models to obtain a hierarchical perception large model, and realizing multi-task parallel perception and dynamic management of target urban traffic. Through the scheme of the invention, the generalization ability and accuracy are improved.

The invention relates to the technical field of civil engineering and computational mechanics, in particular to a load and environmental corrosion coupled reinforced concrete structure analysis method. The method comprises the following steps: carrying out structural finite element modeling; carrying out mechanical field solving; the diffusion characteristics of the crack-driven corrosive medium are updated; solving a corrosive medium diffusion field; the material performance is corrected; carrying out double-time-domain self-adaptive solution; by means of the mode, the coupling effect of complex loads and multiple environmental factors in the reinforced concrete structure can be comprehensively and accurately simulated within the engineering acceptable calculation cost, and reliable prediction of the full life cycle performance is achieved.

The invention discloses an intelligent ecological water resource management system, and the system comprises a sensing layer which is responsible for the collection and preprocessing of multi-source heterogeneous data, and is connected with satellite remote sensing, an unmanned plane LiDAR, a ground sensor, and social media public opinion data; the transmission layer is responsible for data transmission and exchange; the data layer adopts a neural radiation field, loads basin terrain / land utilization GIS data, injects real-time meteorological data to drive hydrological process simulation, constructs a dynamic digital twinborn body, embeds a human activity agent to simulate the influence of different governance policies, selects a variable order fractional derivative kernel function according to a medium fractal dimension, and obtains a variable order fractional derivative kernel function; calculating a migration path of the pollutant in the multi-layer heterogeneous aquifer, simulating an abnormal diffusion process of the pollutant in a heterogeneous medium, and generating diffusion field data; and the application layer is used for generating pollution propagation synthetic data covering long-tail distribution and water quality recovery paths under different treatment policies, and calculating profit and loss distribution of different schemes to upstream and downstream stakeholders.

The invention belongs to the technical field of intelligent grouting simulation, and particularly discloses an intelligent grouting simulation method and system based on a large model.The method comprises the steps that grouting pressure and grouting flow data monitored on a grouting site are obtained, and grouting pressure, flow and grout diffusion form data are obtained through a grouting experiment; obtaining multiphase flow field data through numerical simulation; training a teacher model by utilizing the preprocessed numerical simulation data, grouting experiment data and part of field monitoring data; in the computational domain, for a set prediction working condition, a differential knowledge distillation strategy is adopted, non-field data and field data are processed respectively, and generalization knowledge of the teacher model is migrated to the student model; and acquiring parameters under a to-be-measured working condition, and inputting the parameters into the trained student model to obtain prediction results of the slurry diffusion field, the pressure field and the velocity field. According to the method, the requirement of quickly adapting to new working conditions is met, and the efficiency requirement of real-time decision making in grouting engineering is met.

The invention belongs to the field of robot sensing, decision making and control, and discloses a robot action generation method based on a three-view strategy diffusion field and a related device. The robot action generation method comprises the following steps: acquiring a task instruction and a multi-view RGB-D image observed by a robot; performing action generation by using a pre-trained action generation model to obtain robot action distribution; the motion generation model comprises a three-visual-angle projection module used for inputting a multi-visual-angle RGB-D image and performing three-visual-angle feature mapping processing to obtain three-visual-angle features; the three-view-angle converter module is used for inputting three-view-angle features and task instructions and carrying out feature fusion processing to obtain fused three-view-angle features; and the denoising network module is used for inputting the fused three-view-angle features and carrying out gradual denoising processing to obtain robot action distribution. According to the technical scheme, the technical problems existing in the aspects of sensing precision, calculation efficiency, action generation speed and the like in an existing technical scheme are solved.

A city traffic ubiquitous perception method of a federal auxiliary large model is provided in the application, and belongs to the technical field of data processing, and specifically comprises the following steps: step 1, constructing a space-time diffusion field based on multi-source heterogeneous traffic data of a target city, and dynamically dividing traffic perception subtasks to obtain a subtask set; step 2, performing situational training according to each traffic perception subtask in the subtask set based on federated learning to obtain a traffic perception submodel corresponding to each traffic perception subtask; and step 3, layering and aggregating and splicing all traffic perception submodels to obtain a layered perception large model, and realizing multi-task parallel perception and dynamic management of the target city traffic. Through the scheme of the present application, the generalization ability and accuracy are improved.

The present application relates to a kind of low odor multilayer composite adhesive tape VOC release prediction method, comprising the following steps: S1: the original data of multilayer composite adhesive tape is obtained and preprocessed, and multimodal input data set is obtained;S2: atomic-bond diagram representation is constructed, and input graph neural network is carried out feature extraction, obtains molecular level characterization vector, molecular level feature is fused with material macroscopic attribute, and unified material characteristic representation vector X1 is obtained;S3: based on material characteristic representation vector and environmental parameter as input, establish the neural network model satisfying diffusion equation constraint, obtain VOC diffusion field data X2 for preliminary prediction;S4: the diffusion field data X2 obtained is converted into time series input, and bidirectional recurrent neural network model is constructed to carry out time series feature extraction, and the feature vector X3 containing time dependence is obtained;S5 based on integrated prediction model, output target prediction value.The present application realizes the high-precision, generalizable prediction of the VOC release behavior of multilayer composite adhesive tape.

The invention provides an ecological environment monitoring system and method, and the method comprises the steps: building a three-dimensional digital twinborn model of a designated city in a target region, and enabling the three-dimensional digital twinborn model to comprise thermal environment dynamic data of different environment nodes; determining spatial structure characteristics of different environment nodes, and constructing a spatial communication relationship through the spatial structure characteristics; determining diffusion intensity indexes of each environment node in different thermal diffusion ranges, and further determining the heat island effect intensity of each environment node by combining all the diffusion intensity indexes with the spatial communication relationship; based on the heat island effect intensity, evaluating the influence of the heat island effect intensity on a pollution diffusion field, and obtaining the heat influence pollution diffusion risk of each environment node in different heat diffusion ranges; and generating a multi-scale thermal pollution report of the target area through all the thermal influence pollution diffusion risks. By adopting the scheme of the invention, multi-scale monitoring can be carried out on urban thermal pollution based on a space-time cooperation mechanism of digital twinning.

This invention relates to the field of water quality monitoring technology, specifically to an AI-driven intelligent detection method for water pollution events. The method includes: acquiring pipeline geometric parameters, numerical water quality indicators, and visual images of the water body using intelligent sensors, and extracting multi-dimensional water quality monitoring indicators to generate a water pollution feature tensor; generating a physical constraint deviation term in the loss function using the hydrodynamic convection-diffusion equation, and performing drift compensation on the measured values ​​of the intelligent sensors based on this physical constraint deviation term to construct a water quality evolution prediction model; inputting the water pollution feature tensor into the water quality evolution prediction model to output a three-dimensional dynamic diffusion field of water pollutants; and performing source tracing using a spatiotemporal field inversion operator to calculate the coordinate probability distribution of potential pollution sources and generate early warning commands. This invention improves the robustness and source tracing confidence of complex pipeline monitoring systems through physical consistency constraints and drift compensation.

The invention belongs to the technical field of geophysical exploration, and discloses a ground-air transient electromagnetic attenuation field imaging method based on a complex terrain, which simulates a ground-air transient electromagnetic scene, constructs a model with terrain resistivity for an exploration target area, and performs electromagnetic field finite volume numerical simulation on the model to obtain a ground-air transient electromagnetic attenuation field. Calculating diffusion field induced electromotive force distribution under different half-space resistivity conditions; and then, constructing a loss function of two norms of the induced electromotive force and the observed induced electromotive force under the condition of uniform background resistivity, and searching the optimal background resistivity to enable observation data to reach the minimum value after deducting diffusion field information, thereby extracting an attenuation field for imaging. According to the method, the influence of diffusion information and terrain in a secondary field in the transient electromagnetic method can be effectively removed, the spatial distribution difference of an attenuation field is highlighted, rapid imaging of three-dimensional transient electromagnetic data can be realized, the influence of complex terrain on transient electromagnetic inversion imaging is avoided, and the detection efficiency and reliability of the transient electromagnetic method are improved.

The invention discloses a swarm robot deployment method and device in a dynamic diffusion field, a server and a medium, and belongs to the technical field of robot deployment. Comprising the following steps: dividing a dynamic diffusion field into sub-regions, and arranging sensing robots in the sub-regions; constructing a parabolic pollution diffusion field model, and constructing a global field density observer; constructing a projection operator of the diffusion coefficient, and constructing an adaptive updating law of the diffusion coefficient; obtaining an estimated value of a diffusion coefficient, and obtaining an estimated value of global field density; dividing the dynamic diffusion field into a plurality of sub-regions to obtain a Voronoi cell cavity; calculating an estimated centroid; constructing a sliding mode variable and an auxiliary intermediate variable, and constructing a distributed guidance law; and driving each execution robot to move towards the target deployment position to realize deployment. By constructing a global field density observer and a speed-free distributed guidance law, deployment of swarm robots in a dynamic diffusion field under the conditions that a diffusion coefficient is unknown, the speed is unmeasurable and resources are limited is realized.

The application discloses a kind of intelligent material sound insulation quantity testing device and method, the intelligent material sound insulation quantity testing device and method include using sound source in reverberation chamber to the sound intensity probe in sound absorption chamber occurs sound source, wherein sound source in reverberation chamber forms the diffusion field that energy density is uniform everywhere, in each propagation direction makes random distribution;Using sound intensity probe receives the sound of sound source through the sound material sample to be tested;According to the sound insulation volume of reverberation chamber sound pressure level and sound intensity probe received sound pressure level, the sound material sample to be tested is calculated.This application provides a kind of intelligent material sound insulation quantity testing device and method has the automatic test of using intelligent testing device, can efficiently carry out test and test according to requirement.

The present invention discloses a method for improving the shape control process of carburizing and quenching heat treatment by using heat treatment numerical values, establishing a gear finite element model, setting the temperature heat transfer boundary conditions and carburizing diffusion boundary conditions of the model surface in the carburizing and quenching heat treatment; solving the thermophysical parameters of the material, using thermal simulation tests and heat transfer coefficient determination tests to respectively solve the phase change plasticity coefficients of A, B, and M and the convection heat transfer coefficient of the quenching oil; establishing the mixed rules, heat transfer, diffusion, phase change dynamics, stress-strain constitutive and regression equations of carburizing and quenching heat treatment, and writing a numerical simulation program; numerically simulating the heat of multi-process carburizing and quenching to obtain the distribution laws of temperature field, diffusion field, organization field, and stress-strain field; and then determining the optimal heat treatment process. The present invention realizes the multi-field coupling of carburizing and quenching heat treatment, can improve the consistency between simulation and experimental results, and obtains the influence of process parameters on shape control such as distortion and residual stress.

The invention provides a pollution diffusion prediction method and device based on gamma radioactivity and a wind field, and relates to the technical field of pollutant monitoring, and the method comprises the steps: carrying out the feature peak extraction, nuclide recognition and concentration calculation of a gamma radioactivity energy spectrum data set, and obtaining a nuclide concentration set; constructing a three-dimensional wind field diffusion field through the topographic data and the wind field data set; performing coupling calculation and correlation matching on the nuclide concentration set and the three-dimensional wind field diffusion field through a Gaussian diffusion model, and constructing a correlation matrix of the nuclide concentration and the wind field; obtaining a nuclide half-life period, a gamma-ray emissivity and a terrain, and performing weighted fusion on elements in the incidence matrix through the nuclide half-life period and the gamma-ray emissivity to obtain a fusion coefficient; correcting the fusion coefficient through the terrain to obtain a diffusion trend coefficient set; and constructing a radioactive pollution prediction model, and according to the diffusion trend coefficient set, performing diffusion prediction in a future time period through the radioactive pollution prediction model to obtain a pollution diffusion prediction result.

The present invention discloses a radioactive geophysical data processing method and system based on a physical field attenuation model, which belongs to the field of radioactive geophysical data processing. First, outliers are screened, and a diffusion influence model is constructed by an inverse distance weighted method. The field value of the outlier can be naturally attenuated in space and integrated into the overall data field, avoiding the problem of outliers being ignored or over-smoothed in traditional methods. Kriging interpolation is combined to generate a smooth basic field of normal data, which realizes scientific modeling and precise interpolation of spatial correlation, and significantly improves the fitting accuracy of the data and the authenticity of the field value expression. Subsequently, the diffusion field of the outlier point is superimposed on the normal field, which not only retains the characteristics of the outlier point, but also ensures the smoothness and consistency of the field value. Finally, a contour smoothing model based on deep learning is used to optimize the comprehensive field to generate a smooth contour map with good visual effect, which overcomes the limitations of traditional interpolation methods and provides a solution for radioactive geophysical data processing.

The invention discloses a vehicle-mounted loudspeaker capable of adjusting a pointing angle and a control method thereof, and relates to the technical field of automotive electronics and electroacoustics, and the vehicle-mounted loudspeaker comprises an in-vehicle microphone array, a main control unit, an electric lifting and rotating loudspeaking unit, an auxiliary loudspeaking unit and a self-adaptive digital signal processing power amplifier. The main control unit collects a voice signal, identifies an instruction intention, and calculates the head center coordinate of a sound production passenger; and planning a physical path according to the instruction and the coordinates, and generating an angle control instruction. Executing acoustic parameter coupling calculation: calculating a delay amount in a high-fidelity mode; a diffusion field equalization parameter is configured in a surrounding mode; and calculating the gain and the phase delay of the auxiliary loudspeaker in the privacy mode. And the main control unit synchronously drives the loudspeaker to perform mechanical action and DSP signal processing. According to the method, deterministic mapping of the mechanical degree of freedom and the acoustic parameters is established, dynamic reconstruction of the acoustic path in the vehicle is achieved, the problem of acoustic image positioning drift is effectively solved, and auditory experience is improved.

The invention provides a lateral double-diffusion field effect transistor, a manufacturing method, a chip and a circuit, and relates to the field of semiconductors. The transistor comprises a substrate, a body region, a drift region, a source electrode, a drain electrode and a substrate groove, wherein the substrate groove is of a bowl-shaped structure with a smooth bottom; the field plate oxide layer is formed in the substrate groove, and the thickness of the field plate oxide layer is smaller than the depth of the substrate groove; the gate oxide layer is formed on the upper surface of the substrate without forming the substrate groove between the source electrode and the field plate oxide layer and the groove wall surface, close to the source electrode and not covered by the field plate oxide layer, of the substrate groove; the polycrystalline silicon layer is formed on the upper surface of the gate oxide layer and covers part of the field plate oxide layer, the gate oxide layer and the polycrystalline silicon layer formed on the upper surface of the gate oxide layer jointly serve as a gate, and the field plate oxide layer and the polycrystalline silicon layer covering part of the field plate oxide layer jointly serve as a field plate. According to the invention, the control capability of the gate to the channel can be improved, the on-resistance is reduced, the breakdown voltage is improved, and the device size is reduced.

The present invention relates to the field of geological prospecting technology, and specifically to a waveform processing method, device, equipment and storage medium. The present invention first divides the collected original waveform into various segmented waveforms, selects waveforms that meet the characteristics of the diffuse field from the various segmented waveforms, performs cross-correlation analysis on the selected waveforms, obtains the amplitude cross-correlation function of each diffuse waveform, and analyzes the propagation characteristics of the original waveform in the geological structure based on the amplitude cross-correlation function. The present invention does not need to collect the original waveform that meets the diffusion condition within a long time range, but only needs to extract the segmented waveform that meets the diffusion condition from the original waveform, and then analyzes the propagation characteristics of the original waveform in the geological structure based on the cross-correlation function between the segmented waveforms. Therefore, the present invention can save the time required for analyzing the waveform propagation characteristics.

The present invention is applicable to the field of geophysical exploration technology and provides an inversion method for HVSR spectral ratio curves based on the diffusion field theory, including the following steps: construction of a spectral ratio calculation equation based on the diffusion field theory; artificial synthesis of microtremor records with a random seismic source distribution; model setting and microtremor data acquisition; calculation of HVSR spectral ratio curves; construction and optimization of an inversion objective function; and output of inversion results. Based on the diffusion field theory, the present invention significantly reduces the limitations of traditional single-wavefield assumptions by comprehensively considering various wavefield components such as body waves and surface waves, and improves the inversion accuracy. This method shows excellent adaptability under shallow structure and complex medium conditions, and at the same time has strong noise robustness, and is applicable to complex environments such as urban underground space exploration. In addition, this method reduces the dependence on the initial model, avoids the problem of local optimum, and can be extended to fields such as engineering seismic safety assessment and underground water resource exploration, with broad application prospects.

The present invention provides a global pollutant diffusion field simulation method and system based on sparse data, which relates to the technical field of pollutant diffusion simulation, including: S1, collecting meteorological data, pollution source data and site monitoring concentration data at each natural time; S2, generating an initial particle set at natural time T based on meteorological data and pollution source data at natural time T and before natural time T; S3, combining the particle set at natural time T and particle time t with the meteorological data and pollution source data at natural time T, estimating the state of the particle set at natural time T and particle time t+1, and performing error evaluation. When the error meets the acceptable condition, the RF estimation field at natural time T is estimated based on the state of the particle set at natural time T and particle time t+1, and going to step S4; S5, predicting the predicted pollutant concentration field at natural time T+1 through a generator; S6, evaluating the predicted pollutant concentration field at natural time T+1 through a discriminator.

The present invention provides a lateral double diffused field effect transistor, a manufacturing method, a chip and a circuit, and relates to the field of semiconductors. The transistor includes: a substrate, which includes, from bottom to top, a first substrate layer, a first oxide layer, a heavily doped silicon layer, and a second substrate layer and a second oxide layer protruding from the heavily doped silicon layer; the second oxide layer includes a gate oxide layer and a field plate oxide layer, and the thickness of the field plate oxide layer is greater than the thickness of the gate oxide layer; the heavily doped polysilicon layer and the third oxide layer are formed on the heavily doped silicon layer not covered by the second oxide layer and the second substrate layer; the heavily doped polysilicon layer, the third oxide layer, the second oxide layer and the heavily doped polysilicon layer formed at the bottom of the body region and part of the drift region, and the heavily doped silicon layer at the bottom of the body region and part of the drift region serve as the second gate, and the remaining heavily doped silicon layer and the second oxide layer serve as the second field plate. The present invention can increase the carrier flow channel and increase the working current of the transistor.

The application discloses a kind of dynamic diffusion field under group robot deployment method, device, server and medium, belong to robot deployment technical field.It includes: dynamic diffusion field is divided into sub-region, sensor robot is arranged in sub-region;Parabolic pollution diffusion field model is constructed, global field density observer is constructed;The projection operator of diffusion coefficient is constructed, the adaptive update law of diffusion coefficient is constructed;The estimated value of diffusion coefficient is obtained, the estimated value of global field density is obtained;Dynamic diffusion field is divided into several sub-regions, and Voronoi cell is obtained;Estimated centroid is calculated;Sliding mode variable and auxiliary intermediate variable are constructed, and distributed guidance law is constructed;Drive each execution robot to move to the target deployment position, to realize deployment.By constructing global field density observer and speedless distributed guidance law, the deployment of group robot in dynamic diffusion field is realized under the condition that diffusion coefficient is unknown, speed is not measurable and resource is limited.

A semiconductor structure that includes at least one lateral diffusion field effect transistor is described. The structure includes a source contact and a gate shield that enables the line width of an ohmic region that electrically connects the source / body region to the gate shield to be smaller than the minimum contact feature size. The gate shield defines a bottom recess for forming a narrower bottom portion of the source contact, and a section that flares outward with distance from the ohmic region to extend above and laterally beyond the ohmic region. By providing a wider area for the source contact, the flared portion of the gate shield allows the portion of the gate shield that contacts the ohmic region to be narrower than the minimum contact feature size. As a result, the cell pitch of the lateral diffusion field effect transistor can be reduced.

The invention discloses an N-type drift region accumulation type transverse double-diffusion field effect transistor based on double gates and double channels and a preparation method of the N-type drift region accumulation type transverse double-diffusion field effect transistor. The contradictory relation between the turn-off characteristic and the on-resistance of a device in the prior art is mainly improved. The device comprises a P-type substrate, a first N-type drift region, a trench gate dielectric layer, an N + drain region, an accumulation dielectric layer, top silicon, a source electrode, a drain electrode and a substrate electrode, a second N-type drift region is arranged above the first N-type drift region to form a double-N-type drift region structure, so that the device forms two electron conduction and disappearance paths, and an N-type buffer layer is arranged on one side of the first N-type drift region; a first grid electrode is arranged above the trench gate dielectric layer so as to improve the turn-off characteristic of the device; a first P-type region is arranged on one side of the top layer silicon, and a second grid electrode is arranged above the P-type region, so that a thin electron accumulation layer connecting the channel and the N + drain region is formed on the surface of the first N-type drift region. The on-resistance and turn-off characteristics of the device can be optimized at the same time, and the device can be used for high-power devices of automotive electronics.

The invention discloses a water body micro-plastic magnetic trapping system and method for sewage treatment, and relates to the technical field of sewage treatment.The method comprises the following steps that a density gradient field, a shear-diffusion field and a floating tendency probability field of a water body are obtained; performing interactive mapping on the density gradient field, the shear-diffusion field and the floating tendency probability field to generate an adding amount matrix; and performing short-term prediction on the density gradient field, the shear-diffusion field and the floating tendency probability field in adjacent time windows by taking the dosage matrix as a response variable. According to the method, the time window is divided, the data sequence is constructed, the hybrid predictor is combined to capture the time sequence relevance, and meanwhile, a dynamic fusion mechanism of the vulnerability coefficient and the feeding risk coefficient is introduced, so that the problem that the feeding opportunity is not matched with the micro-plastic concentration peak value due to neglecting of the dynamic change of the water body in the prior art is solved.