Abstract: A three-dimensional star-shaped ?-helix polypeptide having a high-efficiency gene delivery capability, and a preparation method and an application thereof. A dendrimer is used as an initiator and dichloromethane is used as a reaction solvent to initiate high-speed ring-opening polymerization of different types of N-carboxylic anhydride monomers, and groups having different electrical properties are introduced at the ends via click chemistry reactions. The abundant amino groups on the surface of the dendrimer provide enough polymerization sites to enable the polypeptide to form a three-dimensional spherical topological structure, and the topological structure provides an opportunity for initial acceleration of the ring-opening polymerization reaction. The higher positive charge density caused by polypeptide side chain modified guanidine/amino groups etc.

Abstract: A three-dimensional star-shaped ?-helix polypeptide having a high-efficiency gene delivery capability, and a preparation method and an application thereof. A dendrimer is used as an initiator and dichloromethane is used as a reaction solvent to initiate high-speed ring-opening polymerization of different types of N-carboxylic anhydride monomers, and groups having different electrical properties are introduced at the ends via click chemistry reactions. The abundant amino groups on the surface of the dendrimer provide enough polymerization sites to enable the polypeptide to form a three-dimensional spherical topological structure, and the topological structure provides an opportunity for initial acceleration of the ring-opening polymerization reaction. The higher positive charge density caused by polypeptide side chain modified guanidine/amino groups etc.

Abstract: A method, an apparatus, a device and a computer-readable storage medium for recognizing aerial handwriting are provided. The method may include detecting a palm region of a user in a two-dimensional grayscale image; detecting a fingertip in the two-dimensional gray-scale image based on the palm area; determining a spatial trajectory of the fingertip based on a set of two-dimensional gray-scale images, the set of two-dimensional gray-scale images including the two-dimensional gray-scale image; and recognizing handwritten content of the user based on the spatial trajectory. A two-dimensional gray-scale image is used to recognize and track the spatial trajectory of the fingertip, which may speed up aerial handwriting recognition, and has low processing performance requirements for the device, while also ensuring high accuracy.

Abstract: A method, an apparatus, a device and a computer-readable storage medium for recognizing aerial handwriting are provided. The method may include detecting a palm region of a user in a two-dimensional grayscale image; detecting a fingertip in the two-dimensional gray-scale image based on the palm area; determining a spatial trajectory of the fingertip based on a set of two-dimensional gray-scale images, the set of two-dimensional gray-scale images including the two-dimensional gray-scale image; and recognizing handwritten content of the user based on the spatial trajectory. A two-dimensional gray-scale image is used to recognize and track the spatial trajectory of the fingertip, which may speed up aerial handwriting recognition, and has low processing performance requirements for the device, while also ensuring high accuracy.

Abstract: The present invention related to a method for preparing carbon nanospheres modified current collector and its application in metal secondary battery. The said method includes the preparation of carbon nanospheres modified current collector by chemical vapor deposition process and the process for loading metal into the modified current collector as an anode. Comparing with the bare Ni, the said anode with modified current collector demonstrates enhanced stripping/plating efficiency, well confinement of Li dendrite, stable long lifespan and strengthen safety.

Abstract: The present invention related to a method for preparing carbon nanospheres modified current collector and its application in metal secondary battery. The said method includes the preparation of carbon nanospheres modified current collector by chemical vapor deposition process and the process for loading metal into the modified current collector as an anode. Comparing with the bare Ni, the said anode with modified current collector demonstrates enhanced stripping/plating efficiency, well confinement of Li dendrite, stable long lifespan and strengthen safety.

Abstract: The present invention provides a sulfur-carbon composite material, said composite material comprising a porous carbon substrate containing both micropores and mesopores and sulfur, wherein the sulfur is only contained in the micropores of the carbon substrate. Moreover, a lithium-sulfur battery with its cathode comprising said sulfur-carbon composite material and the method for preparing such material is also provided.

Abstract: The present invention relates to a sulfur-containing composite with a core-shell structure for lithium-sulfur battery, wherein the substrate of the core contains macropores and/or mesopores and optionally micropores, and the substrate of the shell is a microporous coating layer; as well as a process for preparing said sulfur-containing composite, an electrode material and a lithium-sulfur battery comprising said sulfur-containing composite.

Abstract: The present invention relates to a sulfur-containing composite with a core-shell structure for lithium-sulfur battery, wherein the substrate of the core contains macropores and/or mesopores and optionally micropores, and the substrate of the shell is a microporous coating layer; as well as a process for preparing said sulfur-containing composite, an electrode material and a lithium-sulfur battery comprising said sulfur-containing composite.

Abstract: The present invention provides a sulfur-carbon composite material, said composite material comprising a porous carbon substrate containing both micropores and mesopores and sulfur, wherein the sulfur is only contained in the micropores of the carbon substrate. Moreover, a lithium-sulfur battery with its cathode comprising said sulfur-carbon composite material and the method for preparing such material is also provided.