Abstract: The present invention discloses a Fe—Al-based metal porous membrane and a preparation method thereof, which relate to the technical field of industrial gas-solid and liquid-solid separation and purification, and mainly address problems in the prior art, such as cracking-prone and peeling of a membrane layer of an existing Fe—Al-based metal porous membrane during its preparation and use. The preparation method of the present invention comprises the steps of: adding a Fe—Al-based metal powder and a metal fiber powder into an organic-additive-added water-based solvent, and mixing them into a slurry; casting the slurry, through a casting machine, to form a membrane green body on a metal substrate layer, and letting it dry; and placing the dried membrane green body in a sintering furnace, to remove organic substances and perform high-temperature sintering and predetermined-temperature reaction synthesis.

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 method, a device and a system for processing startup of a preceding vehicle, wherein, the method for processing startup of a preceding vehicle is applicable to the system for processing startup of a preceding vehicle, the system includes a video sensor and a gravity sensor. The method includes: collecting images in front of a vehicle head of a current vehicle by the video sensor and collecting acceleration information of the current vehicle by the gravity sensor (S102); determining a running state of the current vehicle based on image features in the images in front of the vehicle head and/or the acceleration information (S104); acquiring a movement path of a target object in the images in front of the vehicle head when the running state of the current vehicle is a stationary state (S106); determining whether to generate a reminder for reminding the current vehicle to startup based on the movement path of the target object (S108).

Abstract: A method, a device and a system for processing startup of a preceding vehicle, wherein, the method for processing startup of a preceding vehicle is applicable to the system for processing startup of a preceding vehicle, the system includes a video sensor and a gravity sensor. The method includes: collecting images in front of a vehicle head of a current vehicle by the video sensor and collecting acceleration information of the current vehicle by the gravity sensor (S102); determining a running state of the current vehicle based on image features in the images in front of the vehicle head and/or the acceleration information (S104); acquiring a movement path of a target object in the images in front of the vehicle head when the running state of the current vehicle is a stationary state (S106); determining whether to generate a reminder for reminding the current vehicle to startup based on the movement path of the target object (S108).