Abstract: An information management method, a device, a system and a medium. The information management method applied to a first terminal, including: sending an information acquisition request to a server, so that the server responds to the information acquisition request and sends visitor information to the first terminal; receiving the visitor information sent by the server; generating card information according to the visitor information; and sending the card information to an electronic card, so that the electronic card displays the card information.

Abstract: A scheduling electronic device is used for selecting a candidate time-frequency resource set required for communication of a predetermined electronic device in the group to which the scheduling electronic device belongs; and the scheduling electronic device comprises a processing circuit, and the processing circuit is configured to: receive, from at least one member electronic device located in an overlapping region between said group and other groups, a cooperative sensing result obtained by sensing a time-frequency resource by the at least one member electronic device during at least a portion of a cooperative resource sensing window, so as to assist the scheduling electronic device in selecting a candidate time-frequency resource set, the cooperative resource sensing window being a time period for the at least one member electronic device to perform the assistance so as to sense the time-frequency resource.

Abstract: A mobile liquid nitrogen fire extinguishing system for a utility tunnel is provided, including a liquid nitrogen production assembly, a fire extinguishing assembly, a monitoring device, and a liquid nitrogen conveying tubing. The mobile fire extinguishing assembly includes a liquid nitrogen storage tank and a liquid nitrogen booster pump. The liquid nitrogen storage tank is connected to the liquid nitrogen booster pump. The liquid nitrogen booster pump conveys liquid nitrogen to branch pipes in the utility tunnel through the liquid nitrogen conveying tubing. Liquid nitrogen injection ports are formed in each of the branch pipes. The liquid nitrogen production assembly is mobile and conveys the prepared liquid nitrogen to the liquid nitrogen storage tank. The monitoring device includes a first monitoring assembly and a second monitoring assembly.

Abstract: The present invention belongs to the technical field of turbine cooling of aero-engine and gas turbine, and relates to the honeycomb-like helically cavity cooling structure of turbine blade. The honeycomb-like helically cavity cooling structure of turbine blade includes hollow turbine blade, honeycomb-like helically cavity and pin fins. Some cooling channels are arranged inside the hollow the hollow turbine blade, the cooling gas flows through the tunnels and cools the blade. Multi-arrays of honeycomb-like helically cavity are arranged in the blade wall, for cooling gas to enter and convective cooling. A cylindrical pin fin is arranged in the center of the honeycomb-like helically cavity. In each unit, the inlet hole and film hole are located on both sides of the blade wall, and the center lines of them are parallel in the same vertical plane.