Abstract: Disclosed are a clamping mechanism and an electric tool. The clamping mechanism includes a main body, a locking cap, a spring chuck and an outer sleeve which is sleeved on a periphery of the locking cap and is configured to drive the locking cap to rotate, wherein the spring chuck includes at least two spring claws; the locking cap is connected with the main body, and the locking cap is able to move in a direction close to the main body, or move in a direction away from the main body, so that the spring claws are loosened; a ring piece is arranged at an end, close to the main body, of the locking cap, and an elastic piece is arranged between the ring piece and the locking cap; a first groove is arranged on an inner wall of the outer sleeve, and a cam block.

Abstract: Methods for creating self-folding materials that change shape in response to grooves created in the surface of the materials and when exposed to a stimuli. A tailored computational design tool, digital fabrication platform and mold for use with the methods also are provided.

Abstract: A blockchain-based interconnected vehicle authentication system and method. During message signature process, a registered vehicle verifies a driver, and broadcasts a message. During a message verification process, a registered vehicle checks the message authentication code from a received message based on the system key, and verifies the message based on a public key of a sender of the message. During a block generation and verification process, the first local trust authority broadcasts a block, and share the block to the second local trust authorities after the block passes verification. During a block confirmation process, second local trust authority makes confirmation with regard to the block and send a confirmation result to the root trust authority, to allow the root trust authority link the block into the blockchain in response to receiving confirmation results from second local trust authorities in a quantity exceeding a predetermined number.