Abstract: The present disclosure provides a method and an apparatus for identifying a falling object based on a LiDAR system. The method includes obtaining a point cloud data set of a LiDAR system; identifying a dynamic point cloud cluster set based on the point cloud data at a first moment and a second moment, where the dynamic point cloud cluster set includes at least one dynamic point cloud cluster; and enabling a tracking and determination process in response to identifying the dynamic point cloud cluster set where, for each dynamic point cloud cluster, a data set of a dynamic point cloud cluster at each current moment following the second moment is updated in real time, and it is determined that an object represented by the dynamic point cloud cluster is a falling object in response to determining that the data meets a law of free fall.

Abstract: A self-crosslinkable polyurethane or polyurethane-urea aqueous dispersion, a preparation method therefor, and a use thereof. Side chains of the polyurethane or polyurethane-urea contain non-sterically-hindered siloxy groups. During the drying and activation of the aqueous dispersion, the siloxys in the side chains are hydrolyzed and crosslinked with each other to increase the cross-linking density, significantly improving the heat resistance, the humidity resistance, and other properties of an adhesive obtained therefrom. The aqueous dispersion itself has a good stability. In addition, an application system based thereon has an excellent stability and a long storage time. The aqueous dispersion is suitable for the preparation of high quality paints and sealants, especially adhesives.

Abstract: A self-crosslinkable polyurethane or polyurethane-urea aqueous dispersion, a preparation method therefor, and a use thereof. Side chains of the polyurethane or polyurethane-urea contain non-sterically-hindered siloxy groups. During the drying and activation of the aqueous dispersion, the siloxys in the side chains are hydrolyzed and crosslinked with each other to increase the cross-linking density, significantly improving the heat resistance, the humidity resistance, and other properties of an adhesive obtained therefrom. The aqueous dispersion itself has a good stability. In addition, an application system based thereon has an excellent stability and a long storage time. The aqueous dispersion is suitable for the preparation of high quality paints and sealants, especially adhesives.