Abstract: The disclosure proposes a method for remote upgrade and rollback of Unmanned Aerial Vehicle (UAV) software. The UAV includes a storage area and a UAV software upgrade module; and the storage area is divided into a main storage area, a backup storage area and a data area.

Abstract: Disclosed are a mold assembly for making alkali metal wax packets, a method for preparing same, and a method for using same. The mold assembly comprises a silicon substrate (10), the silicon substrate (10) comprising a mold isolator (11) at the edge of the silicon substrate (10) and a silicon substrate central portion (18). The upper surface of the silicon substrate central portion (18) is indented to form a plurality of wax packet receiving cavities (12). A cavity isolator (13) locates between adjacent wax packet receiving cavities (12). A release sacrificial layer (15) is formed on the upper surface of the silicon substrate (10), and a paraffin layer (16) is formed on the upper surface of the release sacrificial layer (15) away from the silicon substrate (10). Cavities (121) for containing alkali metal are formed on a side of the paraffin layer (16) away from the release sacrificial layer (15). The mold isolator (11) is provided with corrosion release holes (14).

Abstract: The disclosure proposes a method for remote upgrade and rollback of Unmanned Aerial Vehicle (UAV) software. The UAV includes a storage area and a UAV software upgrade module; and the storage area is divided into a main storage area, a backup storage area and a data area.

Abstract: Disclosed are a mold assembly for making alkali metal wax packets, a method for preparing same, and a method for using same. The mold assembly comprises a silicon substrate (10), the silicon substrate (10) comprising a mold isolator (11) at the edge of the silicon substrate (10) and a silicon substrate central portion (18). The upper surface of the silicon substrate central portion (18) is indented to form a plurality of wax packet receiving cavities (12). A cavity isolator (13) locates between adjacent wax packet receiving cavities (12). A release sacrificial layer (15) is formed on the upper surface of the silicon substrate (10), and a paraffin layer (16) is formed on the upper surface of the release sacrificial layer (15) away from the silicon substrate (10). Cavities (121) for containing alkali metal are formed on a side of the paraffin layer (16) away from the release sacrificial layer (15). The mold isolator (11) is provided with corrosion release holes (14).

Abstract: The present application discloses a screen projecting method, an apparatus, a device and a storage medium. A specific implementation is: receiving a request for screen projecting from a terminal device, where the request for screen projecting includes indication information of content to be screen-projected; acquiring the content to be screen-projected according to the request for screen projecting; receiving a first initiating message of at least one screen projecting source from a target projecting device, and determining a target screen projecting source from the at least one screen projecting source; and sending the content to be screen-projected and an identifier of the target screen projecting source to the target projecting device, where the identifier of the target screen projecting source indicates to the target projecting device to display the content to be screen-projected through the target screen projecting source.

Abstract: The present application discloses a screen projecting method, an apparatus, a device and a storage medium. A specific implementation is: receiving a request for screen projecting from a terminal device, where the request for screen projecting includes indication information of content to be screen-projected; acquiring the content to be screen-projected according to the request for screen projecting; receiving a first initiating message of at least one screen projecting source from a target projecting device, and determining a target screen projecting source from the at least one screen projecting source; and sending the content to be screen-projected and an identifier of the target screen projecting source to the target projecting device, where the identifier of the target screen projecting source indicates to the target projecting device to display the content to be screen-projected through the target screen projecting source.

Abstract: An optimized design method for manufacturing a Fresnel grating is disclosed, including the following steps: (1) making a Fresnel surface type of the Fresnel grating equivalent to a curved surface type, and determining, based on the curved surface type to which the Fresnel surface type is equivalent, an optical path difference function of the Fresnel grating: ? (?)=<AP1P2B>?<AOB>+Nm?; and (2) determining a Fresnel grating parameter that minimizes a function value of the optical path difference function, so as to manufacture a Fresnel grating that has an aberration elimination effect. The manufactured Fresnel grating may effectively eliminate a portion of aberrations of the Fresnel grating, and increase a resolution of a spectrometer.

Abstract: An optimized design method for manufacturing a Fresnel grating is disclosed, including the following steps: (1) making a Fresnel surface type of the Fresnel grating equivalent to a curved surface type, and determining, based on the curved surface type to which the Fresnel surface type is equivalent, an optical path difference function of the Fresnel grating: ? (?)=<AP1P2B>?<AOB>+Nm?; and (2) determining a Fresnel grating parameter that minimizes a function value of the optical path difference function, so as to manufacture a Fresnel grating that has an aberration elimination effect. The manufactured Fresnel grating may effectively eliminate a portion of aberrations of the Fresnel grating, and increase a resolution of a spectrometer.