Abstract: A digital twin based method for monitoring behavior of a passenger on an escalator includes: first, constructing a digital twin virtual scene of the escalator carrying the passenger; constructing a virtual person model in a physics engine, generating various types of risky behavior in reality, and outputting different types of behavior of a virtual person; second, through a human posture recognition method for monitoring behavior of a passenger, extracting a feature map as an input by means of a visual geometry group 19 (VGG19) pre-training network, to enter part affinity fields (PAFs) and a part confidence map (PCM), so as to complete recognition of human postures; classifying the human postures with a support vector machine; and performing emergency stop control on the escalator under risky behavior of the passenger according to a result of posture classification.

Abstract: The present invention provides a point cloud data acquisition method and device under a situation of no GNSS signal. The method comprises: re-sampling line data acquired from a topographic map to obtain discrete line data; generating a full-second PPS pulse in a simulating manner; counting by using a distance measuring instrument, sampling the count, when it is detected that the full-second PPS pulse is received, calculating position information at a current moment; simulating a GNSS satellite protocol according to the position information at the current moment; parsing the GNSS satellite protocol by using a point cloud data acquisition module to complete time synchronization, and controlling a LiDAR to acquire point cloud data; parsing the GNSS satellite protocol by using an inertial measurement module, and recording attitude determination positioning data in real time to generate POS data; and optimizing the POS data to obtain accurate point cloud data.

Abstract: The present invention provides a point cloud data acquisition method and device under a situation of no GNSS signal. The method comprises: re-sampling line data acquired from a topographic map to obtain discrete line data; generating a full-second PPS pulse in a simulating manner; counting by using a distance measuring instrument, sampling the count, when it is detected that the full-second PPS pulse is received, calculating position information at a current moment; simulating a GNSS satellite protocol according to the position information at the current moment; parsing the GNSS satellite protocol by using a point cloud data acquisition module to complete time synchronization, and controlling a LiDAR to acquire point cloud data; parsing the GNSS satellite protocol by using an inertial measurement module, and recording attitude determination positioning data in real time to generate POS data; and optimizing the POS data to obtain accurate point cloud data.

Abstract: A coating composition comprises 10-20 wt % of polyester resin, 2-8 wt % of amino resin, and 0-6 wt % of acrylic resin, based on the total weigh of the coating composition. A substrate coated with the coating composition is also provided.

Abstract: The invention relates to a three-dimensional bionic composite material based on refection elimination and double-layer P/N heterojunctions. The preparation method of the composite material comprises: (1) anisotropically etching a silicon wafer with an alkaline solution, to form compactly arranged tetragonal pyramids on the surface of the silicon wafer; (2) performing hydrophilic treatment on the silicon wafer, growing TiO2 crystal seeds on the surface of the silicon wafer, and calcining the silicon wafer in a muffle furnace; (3) putting the silicon wafer obtained in the step (2) into a reaction kettle, and growing TiO2 nano-rods on the side walls of silicon cones by a hydrothermal synthesis method; and (4) depositing PPY nano-particles on the TiO2 nano-rods. The composite material has good refection elimination performance and efficient photogenerated charge separation capability, and is applicable in fields of photo-catalysis, photoelectric conversion devices, solar cells and the like.

Abstract: The invention relates to a three-dimensional bionic composite material based on refection elimination and double-layer P/N heterojunctions. The preparation method of the composite material comprises: (1) anisotropically etching a silicon wafer with an alkaline solution, to form compactly arranged tetragonal pyramids on the surface of the silicon wafer; (2) performing hydrophilic treatment on the silicon wafer, growing TiO2 crystal seeds on the surface of the silicon wafer, and calcining the silicon wafer in a muffle furnace; (3) putting the silicon wafer obtained in the step (2) into a reaction kettle, and growing TiO2 nano-rods on the side walls of silicon cones by a hydrothermal synthesis method; and (4) depositing PPY nano-particles on the TiO2 nano-rods. The composite material has good refection elimination performance and efficient photogenerated charge separation capability, and is applicable in fields of photo-catalysis, photoelectric conversion devices, solar cells and the like.

Abstract: A fetching mechanism includes a support base, a fetching member positioned on the support base and an adsorbing assembly. The adsorbing assembly is positioned on the support base and is spaced from the fetching member. The adsorbing assembly includes a driving member positioned on the support base and an adsorbing member driven by the driving member. The fetching member fetches one welding member, the adsorbing member is driven by the driving member to extend out and adsorbs the workpiece, and the adsorbing member is driven to drawback until each welding member attaches the workpiece. The application also supplies an automatic welding system using the fetching mechanism.