Abstract: A directory metadata operation method, including: in response to receiving a directory query request, obtaining a query path carried therein; obtaining a prebuilt prefix directory data table and a prebuilt full load directory data table, where a key of the prefix directory data table is a prefix path of the directory metadata, which is a subpath corresponding to a hierarchy other than a default hierarchy counting from end in a path corresponding to the directory metadata, a value of the prefix directory data table is the directory metadata, a key of the full load directory data table is identification information of the directory metadata and a value thereof is the directory metadata; determining a matching result between the query path and the key of the prefix directory data table; and determining a query result based on the matching result and the full load directory data table.

Abstract: A method and an apparatus for mounting a file system, a device, and a storage medium are provided. The method includes: detecting whether a mount request obtained from a client includes a target token; in response to determining that the target token is included, querying a target authorization record associated with the target token from candidate authorization records of candidate file systems, where the target authorization record includes a target identifier of the target file system; and feeding back the target identifier to the client, enabling the client to access the target file system using the target identifier.

Abstract: A directory metadata operation method, including: in response to receiving a directory query request, obtaining a query path carried therein; obtaining a prebuilt prefix directory data table and a prebuilt full load directory data table, where a key of the prefix directory data table is a prefix path of the directory metadata, which is a subpath corresponding to a hierarchy other than a default hierarchy counting from end in a path corresponding to the directory metadata, a value of the prefix directory data table is the directory metadata, a key of the full load directory data table is identification information of the directory metadata and a value thereof is the directory metadata; determining a matching result between the query path and the key of the prefix directory data table; and determining a query result based on the matching result and the full load directory data table.

Abstract: A dust cleaning device for wind turbine blades is provided and relates to the technical field of wind power generation equipment. The device includes a main body plate frame, suction wheel mounting frames are installed on both sides of a bottom of the main body plate frame, negative pressure soft rubber suction wheels are installed on each of the suction wheel mounting frames, and the main body plate frame is provided with a first vision sensor, an air compressor is installed on the main body plate frame, the main body plate frame is installed with a plurality of threaded connecting pipes, the threaded connecting pipes are used for connecting with a cleaning nozzle, a plurality of intelligent cleaning disks and a blade dustproof maintenance assembly are installed at the bottom of the main body plate frame.

Abstract: The present disclosure provides a metadata tree snapshot method and apparatus, a metadata tree query method and apparatus, and an electronic device, and relates to the field of data processing technology, and in particular to the field of cloud computing and cloud database technology. The specific realization scheme is as follows: acquiring a basic metadata tree and a first incremental metadata tree, where the basic metadata tree is created based on first snapshot data, the basic metadata tree is locked after being created, the first snapshot data is created at a previous snapshot time instant, and the first incremental metadata tree is created based on a metadata change operation after the basic metadata tree is created; locking the first incremental metadata tree in response to reaching a current snapshot time instant; and creating second snapshot data based on the basic metadata tree and the locked first incremental metadata tree.

Abstract: The present invention relates to the technical field of medical data processing, and discloses an iNPH prediction method based on a visual Oddball paradigm, comprising: performing the same visual Oddball paradigm experiments on a target population before and after the target population undergoes LTT, and obtaining an electroencephalography (EEG) signal data; Pre-processing the EEG signal data, and obtaining an event-related potential feature, the event-related potential feature being a P300 amplitude feature; Based on the event-related potential feature, the iNPH prediction model is trained to obtain the iNPH prediction model.

Abstract: Described herein are methods of enriching and growing Type 2 innate lymphoid cells.

Abstract: A distributed power system, wherein a backup boost transformer is connected between a PFC transformer and a FE DC transformer. The backup boost transformer is also parallel connected with a diode. The backup boost transformer only operates in the sustaining time, if the first DC voltage drops gradually, the backup boost transformer will increase this first DC voltage and stabilize it at a preset voltage of the FE DC transformer. Therefore, the capacity of the storage capacitor of the PFC transformer can be fully utilized to have a longer sustaining time and decrease the variation range of the second DC voltage so as to enhance the efficiency and power density thereof.

Abstract: A distributed power system, wherein a backup boost transformer is connected between a PFC transformer and a FE DC transformer. The backup boost transformer is also parallel connected with a diode. The backup boost transformer only operates in the sustaining time, if the first DC voltage drops gradually, the backup boost transformer will increase this first DC voltage and stabilize it at a preset voltage of the FE DC transformer. Therefore, the capacity of the storage capacitor of the PFC transformer can be fully utilized to have a longer sustaining time and decrease the variation range of the second DC voltage so as to enhance the efficiency and power density thereof.