Abstract: Disclosed is a ship detection and tracking method and device, the method comprises: pre-training a yolov5s network model with a first preset number of high-speed moving object datasets to obtain an initial ship detection model; adding a preset attention mechanism to the initial ship detection model to obtain a transitional ship detection model; inputting a second preset number of annotated ship datasets into the initial ship detection model with the preset attention mechanism for training to obtain a target ship detection model; inputting an original ship video frame into the target ship detection model, and outputting the position information of the ship to be tracked; performing ship video image tracking on the ship to be tracked according to the position information. This disclosure performs pre-training, which only requires a small amount of annotated ship data to determine the target ship detection model, achieving video image tracking of the target ship.

Abstract: The present disclosure provides a hydraulic phosphogypsum (PG)-based cementitious material, and a preparation method and use thereof, belonging to the technical field of cementitious materials. The present disclosure provides a hydraulic PG-based cementitious material, including the following raw materials: modified PG particles and an auxiliary active powder, where the modified PG particles have a dosage of 50 wt % to 95 wt %; the modified PG particles are obtained by conducting modification on original PG particles through a calcareous material, and the calcareous material has a mass 3% to 5% of that of the original PG particles; and the original PG particles have typical dimensions of: a length of 50 ?m to 200 ?m and an aspect ratio of 1.5 to 5; and at least 80% of materials in the auxiliary active powder have a particle size of less than or equal to 60 ?m. In the present disclosure, the hydraulic PG-based cementitious material adopts a particle accumulation method of gap grading.

Abstract: An automatic pressure regulating valve for multiple levels of driving automation of a commercial vehicle includes an upper valve body, a lower valve body, a piston, a main valve core assembly, a switching valve, a quick-acting intake valve, and a quick-acting exhaust valve. The switching valve, the quick-acting intake valve and the quick-acting exhaust valve are all mounted at an upper end of the upper valve body. The piston is located in a chamber formed by the upper valve body and the lower valve body to divide the chamber into an upper control chamber and a lower chamber. The main valve core assembly is mounted in the lower valve body. The automatic pressure regulating valve is applicable to a commercial vehicle allowing for multiple levels of driving automation.

Abstract: Disclosed is a method for calculating surface energy matching index of specific surface area of asphalt mortar-aggregate, including the following steps: determining surface energy parameter of aggregate by vapor adsorption method; determining surface energy parameter of filler by improved capillary rising method; determining specific surface area of asphalt mixture aggregate by specific surface area coefficient method; using an automatic specific surface area and pore analyzer to determine the specific surface area of the filler; calculating adhesive bond energy of the asphalt mixture and adhesive bond energy under liquid condition; calculating the surface energy matching index of asphalt mortar-aggregate. The beneficial effects of this disclosure include: the water stability of asphalt mixture is improved because the influence of the surface energy matching index of the specific surface area of asphalt mortar-aggregate is considered.

Abstract: Disclosed is method for evaluating influence of humidity on adhesion of asphalt-aggregate adhesion, the method includes the following steps: S1 putting multiple pull-out specimens into constant temperature and humidity phases with different relative humidity for curing, after the humidity reaches equilibrium, carrying out macroscopic mechanical pull-out test out and obtaining images of two aggregate surfaces of each broken pull-out specimen; S2 cropping the images, and then importing the cropped images into the Images Pro Plus software; S3 obtaining asphalt peeling rate according to the pixel value and calculation formula of asphalt peeling rate; S4 according to the asphalt peeling rate, asphalt cohesive energy and asphalt-aggregate binding energy, combined with calculation formula of asphalt-aggregate interface energy, obtaining asphalt-aggregate interface energy, and evaluating asphalt-aggregate adhesion according to the interface energy.

Abstract: An intelligent assistance system and a method for berthing and unberthing based on multi-tugboat collaboration are provided.

Abstract: The present disclosure relates to the field of sodium-ion batteries and discloses a sodium-chromium-titanium-manganese phosphate self-supporting electrode material, and a preparation method therefor and use thereof; the sodium-chromium-titanium-manganese phosphate self-supporting electrode material is a composite material of sodium-chromium-titanium-manganese phosphate and carbon, and the sodium-chromium-titanium-manganese phosphate has a chemical formula of Na3+xCrxTi1?xMn(PO4)3, wherein 0<x<1. The sodium-chromium-titanium-manganese phosphate self-supporting electrode material provided by the present disclosure has a brand-new chemical formula and crystal structure, and an electrode prepared thereby does not need a current collector, a binder, or additional conductive carbon, greatly improving the overall energy density of the electrode.

Abstract: The present invention discloses a grating enhanced distributed vibration demodulation system based on three-pulse shearing interference, comprising: a laser device, a pulse optical modulator, a three-pulse generation polarization-maintaining structure, a first erbium-doped fiber amplifier, a first optical circulator, a fiber grating array, a second erbium-doped fiber amplifier, a second optical circulator, a three-in-three optical coupler, a first Faraday rotator mirror, a second Faraday rotator mirror, and a four-channel data acquisition card, On the basis of a distributed fiber grating vibration sensing system, three-pulse dislocation interference and three-in-three optical coupler digital phase demodulation technologies are adopted, XX and XY pulses are utilized to complement interference visibility, and demodulation is performed by selecting a better path, so that polarization fading resistance and interference signal high visibility in the distributed fiber grating vibration sensing system are realized.

Abstract: A method for preparing a microbattery includes: placing a micromachined thin metal-based interdigital electrode into a nickel sulfate and ammonium sulfate solution with a certain concentration; rapidly constructing a three-dimensional porous structure on the surface of the interdigital microelectrode by a bubble-templated electrodeposition method; then, mixing 3,4-ethylenedioxythiophene and manganese acetate with a certain constructing concentration; a manganese dioxide/3,4-ethylenedioxythiophene polymer thin film by a cyclic voltammetry deposition method; combining an obtained interdigital microelectrode cathode with a zinc interdigital anode; and then, coating the surface of the assembled electrode with a manganese sulfate/zinc sulfate/xanthan gum gel electrolyte, and conducting packaging to obtain the microbattery.

Abstract: The invention provides an evaluation method for creep property of LUHPC. It includes the following steps: S1, testing the compressive strength, elastic modulus, environmental temperature and humidity, and creep deformation variables of LUHPC prism samples; S2, based on the test data obtained in the step S1, calculating the initial creep coefficient of LUHPC at different ages and different steel fiber contents, and establishing a primary LUHPC creep model; S3, performing nonlinear regression analysis on the primary LUHPC creep model and fitting it by using the least squares method to establish a secondary LUHPC creep model regarding compressive strength and steel fiber content; S4, calculating a creep coefficient based on the secondary LUHPC creep model to evaluate the creep property of LUHPC. The creep model considers the influence of concrete compressive strength and steel fiber content, which makes the long-term performance analysis of LUHPC structures more reasonable and accurate.

Abstract: An optimized coverage-path planning method for a single unmanned surface mapping vessel (USMV) is implemented with a system including a computer processor executing a computer program loaded in a storage device and implanting the method. The method includes rasterizing and initializing an environmental map, and an unmanned vessel outputting position data and obstacle data according to the environmental map so that path planning is started to provide a target point to the unmanned vessel. In case of tripping in a local optimum at a current-level map for the target point, the map level is updated in an ascending order until the highest level, in order to identify a map level in which the target point is found.

Abstract: Disclosed is a tracking and identification method for multiple vessel targets, devices, electronic device, and storage media. The method comprises: determining the current position of the vessel based on effective AIS data, and projecting it into an image to obtain the visual motion trajectory of the vessel; obtaining target detection boxes corresponding to multiple vessels based on video surveillance data; determining an occluded area based on the target detection boxes of multiple vessels at the previous time, determining the predicted detection box of the occluded area, and loading the appearance features of the predicted detection boxes as the appearance features extracted at the last time before occlusion; integrating effective AIS data from multiple vessels into video surveillance data to determine the vessel's identity. This disclosure can solve the problem of anti-occlusion tracking for vessels in complex vessel navigation scenarios such as severe occlusion and complete occlusion.

Abstract: A water-air integrated search and rescue system includes a flight power module, a navigation power module, a biomimetic boat module, a drone, and an integrated control module. The integrated control module is configured to acquire weather information and determine whether to send a flight signal to the flight power module or to send a navigation signal to the navigation power module based on the weather information; the flight power module is configured to fly the drone to a search and rescue region after receiving the flight signal; the navigation power module is configured to navigate the drone to the search and rescue region after receiving the navigation signal; the integrated control module is further configured to control the drone to deploy the biomimetic boat module; and the biomimetic boat module is configured to carry out search and rescue work in the search and rescue region.

Abstract: Disclosed is an intelligent collision avoidance method for a swarm of unmanned surface vehicles based on deep reinforcement learning; firstly, a theoretical framework of autonomous learning collision avoidance of a swarm of unmanned surface vehicles based on deep reinforcement learning is proposed, and the LSTM neural network memory ability is integrated to realize the continuity of collision avoidance actions; then, according to the USV environment in the framework, the characterization method is obtained, and the USV collision avoidance reward and punishment function is proposed to evaluate the collision avoidance effect; finally, an intelligent collision avoidance training system for a swarm of unmanned surface vehicles is formed. The simulation and verification of this disclosure show that the USV trained in this disclosure can navigate safely in the collision avoidance environment with a swarm of unmanned surface vehicles and realize intelligent collision avoidance.

Abstract: Disclosed is a method for measuring surface energy of aggregates based on static drop method, comprising (1) aggregates grinding and pretreatment; (2) obtaining the surface texture index; (3) calculating the surface energy based on static drop method experiment; (4) fitting to obtain a functional relationship between the surface texture index and surface energy; (5) calculating the surface energy of the original aggregate. The method considers the influence of the grinding process on the surface texture of the aggregates when measuring the surface energy of the aggregates, which significantly improves the accuracy of the static drop method test. The static drop method can be used to replace the vapor adsorption method to test the surface energy of aggregate, and the low-cost optical contact angle instrument can replace the expensive magnetic suspension weight balance system to test the surface energy of aggregate, which greatly reduces the test cost.

Abstract: Disclosed is a method and device for automatic detection of vessel draft depth, which processes the image of a vessel's hull and extracts local area image blocks with vessel's water gauge scale separately to improve the pertinence of data processing and reduce the complexity of data processing; and based on a multi-task learning network model, performing data processing on local area image blocks to extract scale characters and waterline position, reducing the computational complexity of the model; finally, based on the relative positions of the scale and waterline, determining the vessel's draft depth, thus achieving automatic acquisition of the vessel's draft depth, this method greatly improves the efficiency of reading the vessel's draft depth.

Abstract: The present invention relates to the field of inland vessel identification and ranging technology, and discloses a method, system, medium, equipment and terminal for identifying and ranging inland vessels. In the stage of vessel identification, based on the classical YOLO-V4 network model, the MobileNetV1 network is used to replace the feature extraction network CSPDarknet53 of the YOLO-V4 model; In the stage of vessel ranging, a binocular stereo vision ranging model is established, and the FSRCNN is used for super-resolution reconstruction of the original image pairs to enhance the vessel feature information; the ORB algorithm is used to achieve feature detection and matching at the sub-pixel level to obtain the parallax value between image pairs, and the depth information of the vessel target is obtained by triangulation principle and coordinate conversion.

Abstract: A test device for an automatic pressure regulating valve of an electronic braking system includes a test device composed of an air supply, a pneumatic circuit, a valve, a sensor, a signal processing unit, and a control unit. By subjecting an automatic pressure regulating valve to a bench test including a functional test, a static performance test, a dynamic performance test, an air tightness test, a leakage test, and a brake chamber braking force test, the present disclosure avoids the high risk of a field test, improves the test efficiency, and ensures the test consistency. An automatic pressure regulating valve is tested before being loaded on a vehicle, and parameters of the automatic pressure regulating valve are continuously modified through tests to improve the performance, such that the automatic pressure regulating valve can meet the real-time, fast, independent, and accurate regulation requirements of EBS of commercial vehicles.

Abstract: A granite stone powder phosphoric acid-based geopolymer and a preparation method thereof are provided. The granite stone powder phosphoric acid-based geopolymer is prepared from following raw materials in parts by weight: 35-70 parts of granite stone powder, 15-50 parts of metakaolin, 8-50 parts of fly ash, 8-30 parts of acid activation solution and 8-30 parts of solvent.

Abstract: An interferometric demodulation system for a large capacity fiber grating sensing network is provided by the present disclosure, comprising: a continuous light output end of the nanoscale wide-spectrum light source is connected to an input end of the pulse optical modulator, an output end of the reference grating is connected to an input end of the grating array sensing network, and a third communication end of the optical circulator is connected to an input end of the optical amplifier, an output end of the optical amplifier is connected to an input end of the Mach-Zehnder interferometer, three-channel signal output ends of the Mach-Zehnder interferometer are respectively connected to signal input ends corresponding to the embedded signal processor through the photoelectric converter, and the embedded signal processor controls the heating device to control a temperature of an any one of interference arms of the Mach-Zehnder interferometer.