Abstract: This application provides a method for issuing a digital certificate performed by a digital certificate issuing center that includes a public-private key generation module and an authentication module. The method includes: receiving a public-private key request from a node in a blockchain network; generating a public key and a private key of the node by using the public-private key generation module, and transmitting the public and private keys to the node; receiving the public key of the node and registration information of the node, and authenticating the registration information by using the authentication module; and generating, in accordance with a determination that the authentication succeeds, a digital certificate of the node by using the authentication module, and transmitting the digital certificate to the node. The embodiments of this application can improve the probative value of an issued digital certificate, thereby improving the security of data exchange in a blockchain network.

Abstract: A vehicle-mounted refrigerator with a pull rod limiting structure, comprising a refrigerator body and a pull rod, wherein a pull rod connecting base is centrally arranged on an end face of the refrigerator body, pull rod connecting grooves are arranged on the top of both sides of the pull rod connecting base, two support legs of the pull rod are rotationally connected with the two pull rod connecting grooves respectively, and two side walls of the pull rod connecting base are configured with limiting projections which abut against side walls of the support legs when the pull rod is retracted to prevent the support legs from shaking. The invention has the advantages of simple structure and convenient use. The pull rod used can be limited when retracted so as to prevent it from shaking and making noises.

Abstract: A solar rechargeable vehicle refrigerator with plug-in battery, comprising a refrigerator body (1), wherein one side of the refrigerator body (1) is provided with a battery compartment (7) and a battery pack (2) is inserted into the battery compartment (7); the front end of the battery pack (2) is centrally and symmetrically provided with a pair of unlocking buttons (3) which can relatively and transversely move, and a spring (4) is connected between two unlocking buttons (3) which are correspondingly connected with side lock rods (5), the outer ends (51) of the side lock rods (5) are inserted into the lock holes (71) on sides of the battery compartment (7). The invention has simple structure, and the battery pack can be easily taken out and fixed in place.

Abstract: A camera assembly includes a camera component, a first wireless transmission component and a first magnet. The camera component is configured to acquire an image. The first wireless transmission component may be electrically connected to the camera component and configured to transmit data.

Abstract: A camera assembly includes a camera component, a first wireless transmission component and a first magnet. The camera component is configured to acquire an image. The first wireless transmission component may be electrically connected to the camera component and configured to transmit data.

Abstract: Disclosed are a video studio creating method and a service device. The method includes: receiving a live video application-based live video request instruction sent by a client, in which the live video request instruction includes user information; acquiring live channel information associated with the user information; acquiring a live channel configuration parameter set corresponding to the live channel information, and creating a video studio according to the live channel configuration parameter set; and outputting an interactive interface of the video studio to the client.

Abstract: Biomarkers for diabetes and usages thereof are provided. And the biomarkers are nucleotides having polynucleotide sequences defined in SEQ ID NOs: 1-50.