Abstract: The present disclosure proposes a system and method for measuring particle size distribution of sediment grains. The method includes: acquiring a first sediment grain image and a second sediment grain image; processing the first sediment grain image to obtain a sediment grayscale image; obtaining a depth image based on the sediment grain images, and obtaining a depth grayscale image by processing the depth image; based on the depth grayscale image, generating a preliminary region mask; cropping the sediment grayscale image using the preliminary region mask; obtaining an image with first-stage clustering results by performing cluster analysis on the cropped sediment grayscale image; obtaining an image with second-stage clustering results by performing cluster analysis on the sediment grains with a particle size smaller than a preset threshold in the image with first-stage clustering results using a DBSCAN; obtaining the particle size distribution result based on the image with second-stage clustering results.

Abstract: A composite polyester hot-melt adhesive, a preparation method thereof and a preparation method of an anti-scouring geotextile are provided. The preparation method of the composite polyester hot-melt adhesive includes the following steps: performing an esterification reaction on a dibasic acid and a dihydric alcohol under a protection of nitrogen and an action of a titanium/cobalt composite catalyst, adding a stabilizer for a polycondensation reaction to obtain a polyester hot-melt adhesive, then adding polymethyl methacrylate (PMMA) microspheres for mixing and stirring to obtain the composite polyester hot-melt adhesive. The anti-scouring geotextile is obtained by bonding a polyethylene terephthalate woven fabric with a polypropylene geotextile by the composite polyester hot-melt adhesive.

Abstract: A composite polyester hot-melt adhesive, a preparation method thereof and a preparation method of an anti-scouring geotextile are provided. The preparation method of the composite polyester hot-melt adhesive includes the following steps: performing an esterification reaction on a dibasic acid and a dihydric alcohol under a protection of nitrogen and an action of a titanium/cobalt composite catalyst, adding a stabilizer for a polycondensation reaction to obtain a polyester hot-melt adhesive, then adding polymethyl methacrylate (PMMA) microspheres for mixing and stirring to obtain the composite polyester hot-melt adhesive. The anti-scouring geotextile is obtained by bonding a polyethylene terephthalate woven fabric with a polypropylene geotextile by the composite polyester hot-melt adhesive.

Abstract: A method and an apparatus for road guidance are provided. The method includes: acquiring driving data and navigation data of a vehicle; determining a road guidance type of the vehicle based on the driving data and the navigation data, and generating road guidance data corresponding to the road guidance type; and performing 3D rendering on the road guidance data, and visually displaying the road guidance data in an image collected by the vehicle for road guidance.

Abstract: A method and system for uniformly processing logs of multiple formats under a security situation awareness system. The method includes defining a universal interface file and an interface file that corresponds to each device ID of each vendor; collecting log files of respective vendors; putting a file transfer protocol into the collected log files and the defined universal interface file; reading, when change of any log file is monitored, the log file line by line, and updating the log file through the file transfer protocol; identifying a corresponding device ID; screening out an interface file corresponding to the device ID; based on the screened interface file, converting the updated log file into an interpretable uniform format in terms of the universal interface file; and displaying graphically a log file resulted from the uniform format, and completing a uniform processing with respect to the logs of multiple formats.