Abstract: The present disclosure relates to a searchable encrypted data sharing method and system based on blockchain and homomorphic encryption, which protects security of sensitive data on the blockchain and realizes searchable and homomorphic calculation of data ciphertext. According to the present disclosure, a data owner encrypts the generated sensitive data and the keywords extracted according to the data with his own key, and then sends the encrypted transaction information to the cloud server. The cloud server verifies the identity of the data owner. If the verification succeeds, the uploaded ciphertext data is stored on a local server, and a ciphertext index, keyword ciphertext and related evidences of the data storage are uploaded to an alliance chain. The alliance chain node verifies the consistency of the uploaded transaction information, and if the verification succeeds, the transaction information is recorded.

Abstract: A lightweight, thermal insulation and temperature-adjusting modified polymer aerogel composite material and a preparation method thereof are provided. The composite material includes a heat insulation matrix with a topological and closed-cell foaming structure; And an enhanced thermal insulation low thermal conductivity element embedded in the bubble wall of the thermal insulation matrix, i.e. the non-porous part. Due to the special foaming process, the aerogel phase change thermal insulation composite material has a tiny closed-cell structure similar to that of aerogel materials, and aerogel particles and phase change microcapsules are added, so that the internal cell structure and porosity are further improved, and the aerogel phase change thermal insulation composite material has a certain phase change temperature regulation function and excellent thermal insulation performance.

Abstract: A 6-component load cell used for measuring triaxial force and moment components is disclosed. The load cell has a sensing unit and an external case. In the sensing unit, upper and lower rings individually have a plurality of connectors and arcuate thick parts. The sensing unit also has a cross beam, consisting of horizontal and vertical parts crossing at right angles with a plurality of vertical and transverse binocular openings being formed on the two parts. A radial slit is formed at each corner of the junction of the cross beam. A plurality of strain gauges are attached to the cross beam. The external case has upper and lower parts, individually having a plurality of arcuate openings corresponding to the arcuate thick parts of the sensing unit. The lower part of the case also has a plurality of cord lead openings at the side wall.