Abstract: The present disclosure discloses a method and system for data ownership confirmation based on encryption. The method comprises following steps: determining whether data is open; and if the data can be open, encrypting, by a data owner, the data by using a private key of the data owner to complete ownership declaration, and ending a process; or if the data cannot be open, determining whether the data is shared; and if the data cannot be shared, encrypting, by the data owner, the data by using a public key of the data owner to complete data protection, and ending a process; or if the data can be shared, proceeding to ownership declaration and protection steps. The method achieves data ownership confirmation, technically ensures proprietary of data ownership, and implements unique ownership of the data owner for the data, laying a foundation for data responsibility, right, and profit allocation.

Abstract: The present disclosure discloses a method and system for data ownership confirmation based on encryption. The method comprises following steps: determining whether data is open; and if the data can be open, encrypting, by a data owner, the data by using a private key of the data owner to complete ownership declaration, and ending a process; or if the data cannot be open, determining whether the data is shared; and if the data cannot be shared, encrypting, by the data owner, the data by using a public key of the data owner to complete data protection, and ending a process; or if the data can be shared, proceeding to ownership declaration and protection steps. The method achieves data ownership confirmation, technically ensures proprietary of data ownership, and implements unique ownership of the data owner for the data, laying a foundation for data responsibility, right, and profit allocation.

Abstract: The present invention discloses liquid crystal compounds having dibenzopyran derivatives with cycloalkyl groups, and preparation methods and application thereof. The liquid crystal compounds having dibenzopyran derivatives with cycloalkyl terminal groups, shown in formula I, exhibit better miscibility and a very large negative dielectric constant, compared to those having a flexible alkyl chain as a terminal group, therefore the compounds of the present invention, shown in formula I, may improve the miscibility of liquid crystal compounds and broaden the application range of liquid crystal mixtures. In addition, the compounds may also increase the negative dielectric constants of liquid crystal mixtures, having an important application value.

Abstract: The present invention discloses liquid crystal compounds having dibenzopyran derivatives with cycloalkyl groups, and preparation methods and application thereof. The liquid crystal compounds having dibenzopyran derivatives with cycloalkyl terminal groups, shown in formula I, exhibit better miscibility and a very large negative dielectric constant, compared to those having a flexible alkyl chain as a terminal group, therefore the compounds of the present invention, shown in formula I, may improve the miscibility of liquid crystal compounds and broaden the application range of liquid crystal mixtures. In addition, the compounds may also increase the negative dielectric constants of liquid crystal mixtures, having an important application value.

Abstract: A data-oriented information technology system has a data registration center, a data resource pool and a data service unit layer. The data resource pool is a space for storing data; the data registration center is used for constructing uniform data definition, naming and registration functions to realize data management; the data service unit layer includes a plurality of data-oriented, relevant function-encapsulated data function units, and data function units are used for accessing data in the data resource pool; when they first accesses the data resource pool, when the data registration center takes the initiative to refresh the information and informs the data function units, and when abnormalities occur during accessing, it is necessary to obtain information required for access from the data registration center, so that they can access data in the data resource pool.

Abstract: A new, cost effective process for the production of ultrafine particles which is based on mechanically activated chemical reaction of a metal compound with a suitable reagent. The process involves subjecting a mixture of a metal compound and a suitable reagent to mechanical activation to increase the chemical reactivity of the reactants and/or reaction kinetics such that a chemical reaction can occur which produces a solid nano-phase substance. Concomitantly, a by-product phase is also formed. This by-product phase is removed so that the solid nano-phase substance is left behind in the form of ultrafine particles. During mechanical activation a composite structure is formed which consists of an intimate mixture of nano-sized grains of the nano-phase substance and the reaction by-product phase.