Abstract: A flexible guide vane structure of a mixed flow pump with adjustable flow area, a mixed flow pump and an adjustment method are provided. The flexible guide vane structure includes a flexible guide vane and a flexible guide vane adjusting device. The flexible guide vane adjusting device includes a support rib, a support rib base and a base driving mechanism. As the skeleton of the flexible guide vane, the support rib realizes the shape change of the flexible vane through the base driving mechanism and the support rib base. In the mixed flow pump, the flexible guide vane adjusting device is installed inside the blade hub. Through the flow section feedback regulation system, the angle of the support rib is adjusted based on the real-time working condition of the mixed flow pump to adjust the flow area of the blade and achieve the best working condition.

Abstract: Provided is a method for preparing rebaudioside N using an enzymatic method, comprising using rebaudioside A or rebaudioside J as a substrate, and making the substrate, in the presence of a glycosyl donor, react under the catalysis of a UDP-glycosyl-transferase and/or a UDP-glycosyltransferase-containing recombinant cell to generate rebaudioside N.

Abstract: Provided is a method for preparing Rebaudioside C using an enzymatic method, comprising using rubusoside or dulcoside A as a substrate, and making the substrate, in the presence of a glycosyl donor, react under the catalysis of UDP-glycosyltransferase-containing recombinant cell and/or UDP-glycosyltransferase prepared therefrom to generate Rebaudioside C.

Abstract: A clothing treating device comprises a first clothing treating bucket, a second clothing treating bucket and an air duct, wherein an air inlet end of the air duct respectively communicates with a first air inlet of the first clothing treating bucket and a second air inlet of the second clothing treating bucket through an air duct conversion device at the air inlet end, and the air duct conversion device at the air outlet end of the air duct respectively communicates with a first air outlet of the first clothing treating bucket and the second air outlet of the second clothing treating bucket. Through respectively arranging an air duct conversion device at two ends of the air duct, a single air duct can provide a circulating air flow for drying clothes to the first clothing treating bucket or the second clothing treating bucket, respectively.

Abstract: Provided is a method for preparing Rebaudioside J using an enzymatic method, comprising using rebaudioside A as a substrate, and making the substrate, in the presence of a glycosyl donor, react under the catalysis of a UDP-glycosyltransferase-containing recombinant cell and/or UDP-glycosyltransferase prepared therefrom to generate Rebaudioside J.

Abstract: A semiconductor structure includes a substrate and a word line structure. The substrate includes an array region and a peripheral region. The word line structure includes a first conductive layer disposed on the substrate, and the first conductive layer penetrates the array region and extends to the peripheral region in a first direction. In a normal direction of the substrate, a height of the first conductive layer on a surface of the peripheral region is higher than a height of the first conductive layer on a surface of the array region.

Abstract: A computer-implemented method for performing an operation in a tree structure is provided according to embodiments of the present disclosure. In the computer-implemented method, an operation to be performed in a tree structure may be received. The tree structure may comprise a plurality of non-leaf nodes and a plurality of leaf nodes. The operation may be associated with a record comprising a pair of key and value. One of the non-leaf nodes may be determined based on the key of the record. Then, the operation may be performed in the determined non-leaf node.

Abstract: Provided are a class of compounds, represented by formula (I??), as selective EGFR inhibitors, a pharmaceutical composition containing the compounds, useful intermediates for preparing the compounds, and a method for using the compounds of the present invention to treat cell proliferative diseases, such as cancers.

Abstract: A computer-implemented method to transform and execute queries by merging sparsely populated columns. The method includes receiving, from a host, a first query configured to perform a command on one or more target columns in a database. The method further includes analyzing a set of statistics for the database. The method also includes determining, based on the analyzing, a first column of the one or more target columns is included in a set of sparse columns. The method includes generating a plurality of access plans for the first query, including a first access plan that merges the first column with a second column. The method further includes transforming, based on the first access plan, the first query to merge the first column with the second column. The method also includes executing, in response to the transforming of the first query, the first query.

Abstract: A system collects statistical data for a data page, divides the data page into parts, analyzes the data page and the statistical data, based on compression efficiency of one or more compression methods for each part of each page, to determine a compression method for each part of page, and compresses, based on the analyzing, the parts of the data page.

Abstract: A system collects statistical data for a data page, divides the data page into parts, analyzes the data page and the statistical data, based on compression efficiency of one or more compression methods for each part of each page, to determine a compression method for each part of page, and compresses, based on the analyzing, the parts of the data page.

Abstract: A computer-implemented method to transform and execute queries by merging sparsely populated columns. The method includes receiving, from a host, a first query configured to perform a command on one or more target columns in a database. The method further includes analyzing a set of statistics for the database. The method also includes determining, based on the analyzing, a first column of the one or more target columns is included in a set of sparse columns. The method includes generating a plurality of access plans for the first query, including a first access plan that merges the first column with a second column. The method further includes transforming, based on the first access plan, the first query to merge the first column with the second column. The method also includes executing, in response to the transforming of the first query, the first query.

Abstract: A system collects statistical data for a data page, divides the data page into parts, analyzes the data page and the statistical data, based on compression efficiency of one or more compression methods for each part of each page, to determine a compression method for each part of page, and compresses, based on the analyzing, the parts of the data page.

Abstract: The present invention provides a novel aminopyrimidine compound as a fourth-generation EGFR (T790M/C797S mutation) selective inhibitor, a pharmaceutical composition comprising the compound, an intermediate useful for preparing the compound, and a method for treating a cell proliferative disease, such as a cancer, by using the compound of the present invention.

Abstract: Provided are a class of compounds, represented by formula (I??), as selective EGFR inhibitors, a pharmaceutical composition containing the compounds, useful intermediates for preparing the compounds, and a method for using the compounds of the present invention to treat cell proliferative diseases, such as cancers.

Abstract: At least some embodiments of the present disclosure disclose a program production method, a program production device, a program production system and a computer-readable medium. The program production method includes that: at least one medium is acquired; at least one playlist is generated according to the at least one medium, each of the at least one playlist being associated with the at least one medium; at least one program is generated according to the at least one playlist, each of the at least one program including a play region and the play region corresponding to the at least one playlist; and the play region is scheduled.

Abstract: A computer-implemented method masks shard operations in a distributed database. The method includes performing a shard operation on a first table with a first column and a second column, where the shard operation divides the first table into a first shard with the first column and a second shard with the second column. The method also includes receiving a query, where the query is configured to perform at least a first command. The method further includes determining the first command is directed to the first column. The method includes updating the query to access the first shard in place of the first table. The method also includes executing the query and returning a set of results for the query to a source of the query.

Abstract: Trace processing in a database system is facilitated by obtaining database trace data collected from database tracing a database system, and data analyzing, by one or more processors, the database trace data to determine one or more field-related rules to, in part, reduce impact on system performance of database tracing in the database system. Trace processing is further facilitated by applying the one or more field-related rules to a database trace in the database system to adjust trace fields of the database trace according to the one or more field-related rules, thereby reducing impact on system performance of the database trace in the database system.

Abstract: Trace processing in a database system is facilitated by obtaining database trace data collected from database tracing a database system, and data analyzing, by one or more processors, the database trace data to determine one or more field-related rules to, in part, reduce impact on system performance of database tracing in the database system. Trace processing is further facilitated by applying the one or more field-related rules to a database trace in the database system to adjust trace fields of the database trace according to the one or more field-related rules, thereby reducing impact on system performance of the database trace in the database system.