Abstract: A method for functionalizing plant viral nanoparticles (VNPs) includes selecting a plant VNP. Additionally, a metal ion and a phenolic compound that form a metal-phenolic network (MPN), and at least one functional component that adheres to the MPN are also selected. A nanohybrid structure is synthesized from a solution of the selected metal, the selected phenolic compound and the selected functional component such that the synthesized nanohybrid structure has an MPN coating encapsulating the plant VNP with the functional component being embedded in the MPN coating.

Abstract: The disclosure provides an object shoveling mechanism, a 3D printer and a 3D printing method, and relates to the technical field of printing. The object shoveling mechanism is applied to the 3D printer. The 3D printer includes a forming platform, provided with a forming surface.

Abstract: The present invention provides a method and an apparatus for performing a full backup for a distributed database system, and a computer-readable storage medium.

Abstract: A transaction processing method and system, and a server. The method includes: after a first node obtains at least one statement corresponding to a first transaction, the first node may classify each statement, and send the at least one statement to at least one second node according to the type of each statement, respectively, so that the at least one second node generates an execution plan corresponding to the received statement according to the statement; then the first node may process the first transaction according to the received execution plan which corresponds to the at least one statement of the first transaction and is sent by the at least one second node. In this way, embodiments can process statements of multiple types at the same time, thereby effectively improving the processing efficiency of the system, reducing the operating burden of the system, and ensuring the transactionality of the system.

Abstract: Proposed are a transaction savepoint management apparatus and method, which may involve: creating, based on a transaction initiation request from a user terminal, a transaction, wherein the transaction includes a plurality of operation instructions, and subsequently accessing at least one of a plurality of databases so as to sequentially execute the plurality of operation instructions according to a time sequence; and if the plurality of operation instructions includes global savepoint establishment instruction, creating and maintaining a global savepoint queue to coordinate the plurality of databases and implement an operation for global savepoints, and based on the global savepoints, triggering a database, involved in this transaction, from among the plurality of databases to establish local savepoints and record an association relationship between each of the local savepoints and the global savepoints.

Abstract: A method for preparing a magnetic chain structure is provided. The method comprises providing a plurality of magnetic particles; dispersing the plurality of magnetic particles in a solution comprising a dopamine-based material to form a reaction mixture; applying a magnetic field across the reaction mixture to align the magnetic particles in the reaction mixture; and polymerizing the dopamine-based material on the aligned magnetic particles to obtain the magnetic chain structure. A magnetic chain structure prepared by the method is also provided.

Abstract: Proposed are a transaction savepoint management apparatus and method, which may involve: creating, based on a transaction initiation request from a user terminal, a transaction, wherein the transaction includes a plurality of operation instructions, and subsequently accessing at least one of a plurality of databases so as to sequentially execute the plurality of operation instructions according to a time sequence; and if the plurality of operation instructions includes global savepoint establishment instruction, creating and maintaining a global savepoint queue to coordinate the plurality of databases and implement an operation for global savepoints, and based on the global savepoints, triggering a database, involved in this transaction, from among the plurality of databases to establish local savepoints and record an association relationship between each of the local savepoints and the global savepoints.

Abstract: A transaction processing method and system, and a server. The method includes: after a first node obtains at least one statement corresponding to a first transaction, the first node may classify each statement, and send the at least one statement to at least one second node according to the type of each statement, respectively, so that the at least one second node generates an execution plan corresponding to the received statement according to the statement; then the first node may process the first transaction according to the received execution plan which corresponds to the at least one statement of the first transaction and is sent by the at least one second node. In this way, embodiments can process statements of multiple types at the same time, thereby effectively improving the processing efficiency of the system, reducing the operating burden of the system, and ensuring the transactionality of the system.

Abstract: A statement parsing method for a database statement comprises: conducting lexical analysis on a database statement inputted into a database, to obtain an inputted word sequence; looking up a statement similarity table according to the inputted word sequence to determine whether there is an existing word sequence similar to the inputted word sequence in the statement similarity table; if yes, obtaining the parsed data corresponding to the existing word sequence from the statement similarity table; otherwise, parsing the inputted word sequence to obtain parsed data corresponding thereto, and storing the inputted word sequence and the corresponding parsed data in the statement similarity table; and executing the database statement inputted to the database based on the parsed data corresponding to the existing or inputted word sequence. The method can quickly parse a database statement and is favorable for improving the response speed and the working efficiency of a database.

Abstract: A statement parsing method for a database statement comprises: conducting lexical analysis on a database statement inputted into a database, to obtain an inputted word sequence; looking up a statement similarity table according to the inputted word sequence to determine whether there is an existing word sequence similar to the inputted word sequence in the statement similarity table; if yes, obtaining the parsed data corresponding to the existing word sequence from the statement similarity table; otherwise, parsing the inputted word sequence to obtain parsed data corresponding thereto, and storing the inputted word sequence and the corresponding parsed data in the statement similarity table; and executing the database statement inputted to the database based on the parsed data corresponding to the existing or inputted word sequence. The method can quickly parse a database statement and is favorable for improving the response speed and the working efficiency of a database.

Abstract: A core-shell plasmonic nanogapped nanostructured material is provided. The core-shell nanogapped nanostructured material has a core and at least one shell surrounding the core, wherein the at least one shell comprises a first layer comprising a polymer having a catechol group, wherein the first layer defines the nanogap in the core-shell plasmonic nanostructured material, and a second layer comprises a metal disposed on the first layer. A method of preparing the core-shell plasmonic nanogap nanostructured material, and use of the core-shell plasmonic nanogap nanostructured material are also provided. As an embodiment, a polydopamine covalently bonded to a Raman probe or a fluorescent probe is used to prepare the first layer of the shell in said core-shell plasmonic nanogap nanostructured material, thereafter a gold shell is deposited onto the polydopamine to form a second layer of the shell.

Abstract: A method for preparing a magnetic chain structure is provided. The method comprises providing a plurality of magnetic particles; dispersing the plurality of magnetic particles in a solution comprising a dopamine-based material to form a reaction mixture; applying a magnetic field across the reaction mixture to align the magnetic particles in the reaction mixture; and polymerizing the dopamine-based material on the aligned magnetic particles to obtain the magnetic chain structure. A magnetic chain structure prepared by the method is also provided.

Abstract: In the field of communications technologies, a down sampling method and a down sampling device are provided, to enable the energy of a down sampling point obtained in down sampling to be as large as possible. The down sampling method includes: extracting energy statistical values of sampling point sets in a current period; selecting a sampling position corresponding to a sampling point set with the largest energy statistical value as a down sampling position; and performing down sampling according to the down sampling position.

Abstract: In the field of communications technologies, a down sampling method and a down sampling device are provided, to enable the energy of a down sampling point obtained in down sampling to be as large as possible. The down sampling method includes: extracting energy statistical values of sampling point sets in a current period; selecting a sampling position corresponding to a sampling point set with the largest energy statistical value as a down sampling position; and performing down sampling according to the down sampling position.