Abstract: A data access control method, device and medium based on semantic support. The method comprises: establishing an ontology model of data semantics by a data provider based on an ontology knowledge of each distributed data source data, and uploading the ontology model to a blockchain network; rule information is provided for the data source data, and a distributed data source data address is provided for writing the rule information into a smart contract of the blockchain network. The rule information is used to represent an access control policy, wherein data access requests are uploaded through the blockchain network, and authorization information for the data access request is acquired from rule information in the smart contract. If it is determined that the authorization information permits access, encrypted fine-grained data corresponding to the data access request is sent to a data access end.

Abstract: A humidifying device and a humidifying method for an air-conditioning unit includes a connecting piece, where the connecting piece includes a connecting coiled pipe fixedly connected to an inner wall of a top end of a humidifying cavity, an air inlet end of the connecting coiled pipe extends out of the humidifying cavity to be selectively communicated with an air-conditioner indoor unit or air-conditioner outdoor unit, and an air outlet end of the connecting coiled pipe extends into a flocculating cavity; a flocculating piece arranged in the flocculating cavity, including a flocculating cylinder rotatably connected with the flocculating cavity, where the flocculating cylinder is provided with flocculating holes, one end of the connecting coiled pipe extending into the flocculating cavity is in transmission connection with the flocculating cylinder; a heat exchanging piece arranged in the humidifying cavity includes a supporting shell, supporting holes and a vibrating piece.

Abstract: The present invention relates to the technical field of disaster model experiment of underground engineering, and more particularly to an experimental system for surrounding rock crack evolution and water inrush disaster change in a tunnel excavation of a near-covered karst cave. The experimental system includes a base, an upper crossbeam, standing columns, an experimental cabin, guide rails, a tunnel excavation device and an experimental control system. By setting a tunnel excavation device instead of the traditional manual excavation experimental system, the step-by-step excavation of the tunnel is realized. A camera inside the tunnel mold collects real-time images of the whole process of tunnel excavation. The front side plate is separated from the whole experimental cabin, such that the deformation and damage of the front side of the physical model can be directly observed.

Abstract: A preparation method of photo catalyst by transition metal halide molten salt and use thereof, wherein low-valence titanium complexes stable in air and water are used as a Ti source, transition metal halide is used as molten salt, mixing the Ti source and the molten salt as per a certain mole ratio and grinding, heating at air atmosphere until no lower than a fusion point of the molten salt, keeping the molten salt in a state of melting, maintaining the temperature, washing with water, and reduced TiO2?x rich in Ti3+ and Ov is obtained in one-step melting reaction. Deficiencies that multiple steps are involved for preparing conventional defect titanium dioxide or use of inflammable and explosive reducing gases or other dangerous reducing agents or oxidizing agents have been addressed; and the defect that the Ti source is liable to be dissolved in organic and other solvents is fully avoided.

Abstract: Disclosed are a device and a method for measuring a Soret coefficient. The device comprises a control component, a diffusion mechanism, a temperature regulating component and a circulation mechanism. The diffusion mechanism comprises a liquid flow tank; the side wall of the inner cavity of the liquid flow tank is fixedly connected with an insulating layer; the side wall of that liquid flow tank is communicated with a plurality of liquid taking components; the circulation mechanism comprises a transfer unit, a cooling component and a heating unit; a temperature regulating component is fixedly connected between the liquid flow tank and the cooling component; the bottom surface of the heating unit is fixedly connected with the top surface of the liquid flow tank; the cooling component and the heating unit are respectively communicated with the transfer unit; the transfer unit is electrically connected with the control component.

Abstract: The present invention discloses preparation and use of a nanoparticle-doped RNA hydrogel targeting to a triple negative breast cancer (TNBC). The RNA hydrogel is a pure RNA system formed in a rolling circle transcription manner. The transcription process generates a large number of GC bonds, which provides a large number of sites for the introduction of DOX. The large number of RNA copy structures generated by rolling circle replication is a polyanionic aggregate. Due to the strong electronegativity of the polyanionic aggregate, electropositive MnO2@Ce6 nanoparticles are introduced, such that the colloid cationic MnO2@Ce6 particles can be stabilized by the polyanionic hydrogel, and thus target into a breast cancer cell for synergistic treatment. It can be used for a drug slow release system, has good biocompatibility, and has broad prospects in the fields of growth inhibition effects on targeted MDA-MB-231 tumor cells, inhibition of cancer metastasis and recurrence, and the like.