Abstract: A diagonalized spatial smoothing coherent DOA estimation method based on non-circular signals includes the following steps: firstly, receiving non-circular signals through a uniform linear array antenna to obtain received information; according to non-circular characteristics of the signals, concatenating the received information and the conjugate to form extended received information, and calculating the covariance matrix; then extracting subarrays from the covariance matrix diagonally, and performing augmented spatial smoothing operation on the extracted subarrays; splicing the results of smoothing operations to generate a new covariance matrix, and performing eigenvalue decomposition on the new covariance matrix to obtain a noise subspace; finally, based on the noise subspace, estimating the DOA of the non-circular signal by the reduced-dimension MUSIC algorithm.

Abstract: A method for constructing a large prediction model of coal burst based on multimodal data is provided. The method includes: constructing a multimodal data set by collecting data from different modalities; preprocessing the multimodal data set to construct precursor pattern sequences; and converting, according to features of different mining areas, each precursor pattern sequence into a corresponding grade form to assign a corresponding risk grade label of coal burst; processing graded precursor pattern sequences by using Transformer to predict an occurrence probability of risk grade of coal burst; evaluating, by using a comprehensive index method, risk degrees of mining information data and geological structure data, and evaluating an overall risk grade of coal burst comprehensively by combining the prediction result output by the coal burst prediction module.

Abstract: An electrical connection device includes a through-type connector, a first cable-end connector and a second cable-end connector. The through-type connector includes an outer shell and a plurality of pins, the outer shell is formed with a first cavity and a second cavity, the first cavity has a first independent insertion groove and a second independent insertion groove. The first cable-end connector is provided to be capable of independently inserting into the first independent insertion groove and includes a first insulative housing, a first terminal position assurance member, a plurality of first terminals and a plurality of first conductive wires. The second cable-end connector is provided to be capable of independently inserting into the second independent insertion groove and includes a second insulative housing, a second terminal position assurance member, a plurality of second terminals and a plurality of second conductive wires.

Abstract: A method and system for assessing contamination level of non-aqueous phase liquids (NAPL) in groundwater based on image learning are provided herein. A water image data of groundwater monitoring wells is acquired, processed, and extracted to give image features. Types and concentrations of the NAPLs in groundwater are obtained based on monitoring data of groundwater monitoring wells collected within a preset period, and matched with the image features of the water image data to construct a feature dataset. A groundwater NAPL contamination database is established based on the feature dataset in combination with local hydrogeological information. A groundwater NAPL contamination level assessment model is constructed based on deep learning, and trained by utilizing the groundwater NAPL contamination database. The NAPL contamination level of water in the groundwater monitoring wells is determined to issue the contamination early warning.

Abstract: Techniques described herein provide for text string comparison for documents identified using automated near-duplicate detection. In one example, a system can receive a pair of documents. The system can extract text strings from the documents. The system can normalize the extracted text strings using a predefined normalization scheme. The system can identify boilerplate text segments in the normalized text strings. The system can remove the boilerplate text segments from the normalized text strings to generate filtered text strings. The system can divide the filtered text strings by identifying section indicators. The system can, for each section, generate groupings of text strings and determine a similarity score between each pair of corresponding groupings to identify matching groupings of text strings. The system can generate an output for display showing the visual indications of the matched groupings of text strings.

Abstract: The present application provides an ultrahigh-molecular-weight polyolefin separator, including ultrahigh-molecular-weight polyethylene. ultrahigh-molecular-weight polyethylene has an average molecular weight of ?1 million. The ultrahigh-molecular-weight polyolefin separator has a median aperture of 0.04 ?m-1 ?m, the maximum aperture of no more than 1.2 ?m, and a puncture strength of ?50 gf. Further, the present application further provides a method for preparing an ultrahigh-molecular-weight polyolefin separator. Because the polyolefin separator is safer than an ordinary non-woven separator, and has higher ionic conductivity and larger median aperture, the problems that an ordinary non-woven separator of a lithium-ion battery, although having a high lithium-ion passage rate, has a high degree of danger, and is prone to cause a short circuit of the battery are exactly solved.

Abstract: A belt cleaning device for a coal loading and unloading belt conveyor, including a split-type spraying pipe, a first alloy scraper, and a second alloy scraper. The first alloy scraper is provided on the belt, the belt is supported by a roller. The second alloy scraper is elastically pushed against an underside of the belt and suspended below the roller. A material scraping area is covered by the split-type spraying pipe, the split-type spraying pipe is configured to spray water onto the material scraping area. The belt cleaning device can independently control the inclination angle of the first alloy scraper and the second alloy scraper and uniformly control the adhesion force between the alloy scrapers and the belt, thus solving the problem of scraping off adhesive materials at different wear rates of the belt, improving the efficiency of the coal loading and unloading belt conveyor, and reducing maintenance needs.

Abstract: This application provides a power supply circuit. The power supply circuit may include a power conversion module, a compensation module, a sampling module, and a gain-adjustable drive module. The power conversion module is configured to: convert a first direct current voltage into a second direct current voltage and output the second direct current voltage to the load. The sampling module is configured to: collect a voltage of the load, convert the voltage of the load into a first sampling voltage, and output the first sampling voltage to the gain-adjustable drive module. The gain-adjustable drive module is configured to output a gain-adjustable drive voltage to the compensation module based on the first sampling voltage. The compensation module may be configured to output a compensation current to the load or bleed an output current of the power conversion module based on the first direct current voltage and the gain-adjustable drive voltage.

Abstract: The present disclosure pertains to the technical field of pharmaceutics, and relates to a 3,4-alkoxy substituted phenethyl lactam compound as an enzyme inhibitor of phosphodiesterases, a preparation method therefor, and pharmaceutical use thereof. Specifically, the present disclosure relates to a compound represented by general formula (I), a preparation method therefor, and use thereof in a medicament for preventing and/or treating a phosphodiesterase-associated disease.

Abstract: A zero-delay panoramic video bit rate control method that considers distortion temporal propagation aims to optimize target bit allocation and achieve global rate-distortion optimization in coding. It encompasses coding tree unit (CTU)-level bit rate control and temporal global rate-distortion optimization. CTU-level bit rate control involves optimizing target bit allocation and updating bit rate control parameters. Temporal global rate-distortion optimization utilizes the reconstruction error and motion compensation prediction error information of the previous coded frame to estimate the temporal dependence between CTUs in the current coding frame and those in the previous coded frame to adjust the coding parameters of the current CTU.

Abstract: A cleaning robot may include a body, a driving wheel, and a cleaning member. The driving wheel and the cleaning member may be installed on and rotatably connected with the body. The cleaning robot may have a backward obstacle-crossing mode and a forward obstacle-crossing mode. In the forward obstacle-crossing mode, a head of the cleaning robot may face an obstacle, the driving wheel may rotate forward, and the cleaning member may rotate in the same or in an opposite direction to the rotation of the driving wheel. In the backward obstacle-crossing mode, a tail of the cleaning robot may face the obstacle, the driving wheel may rotate reversely, and a rotation direction of the cleaning member may be the same as or opposite to the rotation direction of the cleaning member in the forward obstacle-crossing mode.

Abstract: Disclosed is a massive data-driven method for automatically locating a mine microseismic source, including: constructing a microseismic wave calibration data set by using a large-scale seismic data set containing seismic signals and non-seismic signals; constructing a pre-training calibration model based on a full convolution neural network through deep learning of a seismic wave calibration data set; using microseismic data of mine sites for transfer learning of an initial arrival time calibration model to construct an arrival time automatic calibration model suitable for mine microseismic signals; and automatically as well as accurately locating mine microseismic events based on an isokinetic homogeneous isotropic velocity model by using an optimization algorithm to deduce arrival time errors and through repeated iteration and fine-tuning.

Abstract: A tree assessment method and a tree assessment device are provided, including steps: acquiring a tree image set to be evaluated, wherein the tree image set to be evaluated includes a plurality of tree images to be evaluated; using a tree risk assessment model that is pre-constructed to perform a risk prediction and a multi-scale feature extraction on each of the plurality of tree images to be evaluated to obtain a risk assessment result and a multi-scale feature; generating an initial assessment report based on the risk assessment result and determining a similarity between the multi-scale feature and a target risk category feature that is pre-stored; and generating a tree assessment report based on the similarity and the initial assessment report.

Abstract: The present disclosure provides a method and device for intelligent control of heating furnace combustion based on a big data cloud platform, which relates to the technical field of artificial intelligence control. The method includes: construction of big data cloud platform based on production and operation parameters of the heating furnace; identification of key factors in the production process of the heating furnace by using big data mining technology; independent deployment of traditional heating furnace combustion control systems based on the mechanism model; and integration of cloud platform big data expert knowledge base and the heating furnace combustion intelligent control system.

Abstract: A landslide volume calculation method fusing principal component analysis and voxel integration, comprising the steps of: collecting and registering bi-temporal point cloud data; establishing grids in a landslide area; calculating a normal vector of a point in each grid and a fitting planar function by using a principal component analysis method; calculating a volume variation of each grid by means of planar function integration; and calculating volume variations of all the grids, identifying an abnormal value by means of statistical analysis, and correcting the abnormal value. In the present disclosure, a landslide volume is efficiently and accurately calculated by using laser radar ranging technology and an acquired point cloud, constructing voxel units, fusing same with a principal component analysis method, and using voxel-based double integration to calculate volume variations inside voxels, thereby solving the problem of a volume result calculated by means of an average elevation being unreliable.

Abstract: A zero-delay panoramic video bit rate control method that considers distortion temporal propagation aims to optimize target bit allocation and achieve global rate-distortion optimization in coding. It encompasses coding tree unit (CTU)-level bit rate control and temporal global rate-distortion optimization. CTU-level bit rate control involves optimizing target bit allocation and updating bit rate control parameters. Temporal global rate-distortion optimization utilizes the reconstruction error and motion compensation prediction error information of the previous coded frame to estimate the temporal dependence between CTUs in the current coding frame and those in the previous coded frame to adjust the coding parameters of the current CTU.

Abstract: A composite phase change material with a high thermal storage density and a preparation method are provided. The preparation method includes the following steps: oxalic acid dihydrate, glutaric acid, magnesium sulfate heptahydrate and alkylolamide phosphate are mixed uniformly according to parts of mass, then heated and held for a period of time, further stirred at a constant temperature, and then cooled to room temperature for solidification, and finally a composite phase change material with a high thermal storage density is obtained.

Abstract: The invention discloses a multi-port DC transfer switch based on a controllable negative voltage source, which belongs to the technical field of power equipment. It includes X (X=5 or 3) main branches, a current commutation branch and X groups of controllable conduction switches. The main branch is composed of through-current vacuum switch, and the current commutation branch is composed of a controllable negative voltage source and a square wave resonant DC circuit breaker in series. The five main branches at the sending terminal are connected to the positive rectifier at the sending terminal, etc., and the three main branches at the receiving terminal are connected to the positive rectifier at the receiving terminal, etc., which are connected to the current commutation branch through the controllable conduction switches.

Abstract: Techniques described herein provide for generation of structured output for documents identified using automated near-duplicate detection. In one example, a system can receive a set of documents including at least one pair of similar documents determined to be similar to one another based on similarity scores generated using a predefined similarity scoring technique. The system can generate document groups by merging together pairs of documents that share at least one document. The system can, for each of the document groups, identify a representative document for the document group. The system can generate an output for display including a section for each document group, in which each section includes the representative document for the document group and, for each document in the document group, the similarity score relative to the representative document for the document group.

Abstract: A rock burst hazard prediction method based on vibration wave energy attenuation characteristics of a mine earthquake cluster is provided. The rock burst hazard prediction method comprehensively considers the static load and dynamic load effects of the vibration waves of the mine earthquake cluster based on vibration wave energy attenuation characteristics of the mine earthquake cluster. The static load strength index and the dynamic load strength index involved in the method have clear physical meanings. A comprehensive prediction index calculation model proposed based on the dynamic and static load superposition principle of rock burst occurrence is clear, and the method has a firm theoretical support as well as strong universality and operability. Meanwhile, the updating and adjustment of weights are rapid and the objective judgment and prediction of the final comprehensive prediction results are efficient, and the high-energy mine earthquake and impact behavior area can be effectively predicted.