Abstract: The present invention relates to a modified polyurethane prepolymer, a two-component polyurethane adhesive and the preparation method thereof. The modified polyurethane prepolymer is prepared from the raw materials comprising the following components: polyurethane prepolymer and graphene oxide; wherein, the polyurethane prepolymer is prepared from the raw materials comprising the following components: copolymer containing ureidopyrimidinone groups and aliphatic isocyanate; wherein, the copolymer containing ureidopyrimidinone groups is formed by copolymerization of the raw materials comprising the following components: alkyl acrylate ureidopyrimidinone, and hydroxyethyl alkyl acrylate; wherein, the alkyl acrylate ureidopyrimidinone has the structure shown in Formula (I); and the hydroxyethyl alkyl acrylate has the structure shown in Formula (II). The two-component polyurethane adhesive containing the modified polyurethane prepolymer has excellent mechanical properties and aging resistance simultaneously.

Abstract: The present invention relates to the technical field of automobile fittings, and discloses a foldable and flexible vent for an air conditioner, comprising a base, a hose and an air guide cylinder, wherein one end of the base communicates with the vent for the air conditioner, and the other end communicates with the hose; the air guide cylinder is arranged at one end of the hose away from the base; the vent further comprises an air damper and a rotating mechanism. The plurality of air dampers are distributed in a circular array in the air guide cylinder with the axis thereof as the center, and then adjusted by the synchronous angle of the rotating mechanism, so that the wind direction of the hose flowing into the air guide cylinder is uniformly discharged in a spiral manner, achieving the effect of simple, convenient and efficient uniform venting.

Abstract: Disclosed are a simultaneous localization and mapping (SLAM) method and a device based on a sparse depth image, a terminal equipment and a medium. The SLAM method based on a sparse depth image includes: acquiring an environment image collected by a camera and an environment sparse depth image collected by a time of flight (TOF) sensor, and analyzing and processing the environment image and the environment sparse depth image through a preset SLAM system to acquire corresponding pose information. The pose information is used for localization, mapping and path planning of an unmanned system.

Abstract: The present invention provides a coupled feeding multi-band antenna and a coupled feeding multi-band circularly-polarized spiral antenna. The coupled feeding multi-band antenna includes multiple multi-band antenna groups, where each multi-band antenna group forms a multi-band co-feeding antenna with a grounding branch through a coupled feed-in electrode, the coupled feed-in electrode is arranged on one surface of a substrate portion, and the grounding branch is arranged on the other surface of the substrate portion. In this way, a broadband coupled feeding multi-band antenna that meets requirements of people is produced, which not only improves channel capacity and anti-interference ability of an antenna communication system, but also overcomes design difficulties of a feeding network and a feeding structure, achieving good impedance matching and circularly-polarized radiation performance.

Abstract: The present invention relates to the technical field of automobile fittings, and discloses a foldable and flexible vent for an air conditioner, comprising a base, a hose and an air guide cylinder, wherein one end of the base communicates with the vent for the air conditioner, and the other end communicates with the hose; the air guide cylinder is arranged at one end of the hose away from the base; the vent further comprises an air damper and a rotating mechanism. The plurality of air dampers are distributed in a circular array in the air guide cylinder with the axis thereof as the center, and then adjusted by the synchronous angle of the rotating mechanism, so that the wind direction of the hose flowing into the air guide cylinder is uniformly discharged in a spiral manner, achieving the effect of simple, convenient and efficient uniform venting.

Abstract: The present invention relates to a modified polyurethane prepolymer, a two-component polyurethane adhesive and the preparation method thereof. The modified polyurethane prepolymer is prepared from the raw materials comprising the following components: polyurethane prepolymer and graphene oxide; wherein, the polyurethane prepolymer is prepared from the raw materials comprising the following components: copolymer containing ureidopyrimidinone groups and aliphatic isocyanate; wherein, the copolymer containing ureidopyrimidinone groups is formed by copolymerization of the raw materials comprising the following components: alkyl acrylate ureidopyrimidinone, and hydroxyethyl alkyl acrylate; wherein, the alkyl acrylate ureidopyrimidinone has the structure shown in Formula (I); and the hydroxyethyl alkyl acrylate has the structure shown in Formula (II). The two-component polyurethane adhesive containing the modified polyurethane prepolymer has excellent mechanical properties and aging resistance simultaneously.

Abstract: A method for preparing temsirolimus, the method including: using a substituted aromatic aldehyde to protect 2,2-dimethylol propionic acid to produce intermediate II; carrying out reaction between the intermediate II and 2,4,6-trichlorobenzoyl chloride; carrying out condensation reaction between a resulting product and rapamycin to produce intermediate III; and finally using sulfuric acid to remove a protecting group from the intermediate III to yield temsirolimus.

Abstract: A method for synthesizing temsirolimus, the method including: using a substituted boric acid to protect 2,2-dimethylol propionic acid to produce intermediate II; carrying out a reaction between the intermediate II and 2,4,6-trichlorobenzoyl chloride; carrying out condensation reaction between a resulting product and rapamycin to produce intermediate III; and finally using a diol to remove a protecting group from the intermediate III to yield temsirolimus.

Abstract: A method for preparing temsirolimus, the method including: using a substituted aromatic aldehyde to protect 2,2-dimethylol propionic acid to produce intermediate II; carrying out reaction between the intermediate II and 2,4,6-trichlorobenzoyl chloride; carrying out condensation reaction between a resulting product and rapamycin to produce intermediate III; and finally using sulfuric acid to remove a protecting group from the intermediate III to yield temsirolimus.

Abstract: A method for synthesizing temsirolimus, the method including: using a substituted boric acid to protect 2,2-dimethylol propionic acid to produce intermediate II; carrying out a reaction between the intermediate II and 2,4,6-trichlorobenzoyl chloride; carrying out condensation reaction between a resulting product and rapamycin to produce intermediate III; and finally using a diol to remove a protecting group from the intermediate III to yield temsirolimus.