Abstract: This disclosure provides a query task execution method, apparatus, computer device, storage medium. The method includes: receiving a query task for a target data table; determining at least one candidate degree of parallelism for executing the query task based on a first number of child tables obtained by pre-partitioning the target data table; selecting a target degree of parallelism within a preset range of degrees of parallelism from the at least one candidate degree of parallelism; and determining required computing units according to the target degree of parallelism, and evenly allocating the child tables to the computing units which concurrently execute the query task based on the allocated child tables.

Abstract: The present disclosure provides a database-based data query method, an apparatus, an electronic device and a storage medium. The method includes: receiving a data query request; determining a plurality of search strategies that match target data as indicated by the data query request; for each search strategy, querying a data selection rate stored in association with the search strategy from a cache, wherein the data selection rate stored in the cache is determined based on real selection rates obtained from multiple historical data queries; in response to an existence of the data selection rate stored in association with the search strategy, taking the data selection rate as a target selection rate corresponding to the search strategy; and determining a target search strategy based on the target selection rate corresponding to respective search strategy, wherein the target data is obtained from a database based on the target search strategy.

Abstract: The present disclosure relates to a database-based data processing method, device, medium, and apparatus, the method including: receiving a target query statement; determining a corresponding target materialized view for executing the target query statement according to a data query time corresponding to the target query statement and a time granularity of the materialized view in a database, wherein the database is constructed with the materialized view at different time granularities; rewriting the target query statement according to the time granularity of the target materialized view to obtain a plurality of target sub-query statements, wherein the target sub-query statements include sub-query statements which are queried based on the target materialized view; and merging the target sub-query statements, and performing a data query according to a query statement obtained by merging.

Abstract: There are provided a method, device, and storage medium for processing a data table. The method includes: performing an equivalent join on a left table and a right table in two data tables that are to be joined by a hash join, and acquiring first associated data of an association between the left table and the right table; filtering the first associated data according to a predetermined non-equivalent filtering condition, and determining second associated data satisfying the predetermined non-equivalent filtering condition in the first associated data; identifying, in a predetermined data structure according to a target join type of the two data tables; and processing the left table and/or the right table according to the target join type of the two data tables and the predetermined data structure to generate a target join table.

Abstract: The present disclosure describes hybrid transactional and analytical processing (HTAP) techniques. A HTAP system comprises a first processing engine configured to perform online transactional processing, a second processing engine configured to perform online analytical processing, and a storage in communication with the first processing engine and the second processing engine. The first processing engine, the second processing engine, and the storage may be modularized and configured to be decoupled from each other. The system may be configured to capture data by the first processing engine in real time, organize the data in a first format in a first part of the storage for use by the first processing engine, propagate the data to a second part of the storage subsystem, and organize the data in a second format in the second part of the storage for use by the second processing engine.

Abstract: A backplane and a glass-based circuit board. The backplane includes: a base substrate and a plurality of light-emitting units, arranged in an array on the base substrate. Each of the light-emitting units includes at least one light-emitting sub-unit; the light-emitting sub-unit includes a connection line and a plurality of light-emitting diode chips connected with the connection line, and the light-emitting diode chips are located on a side of the connection line away from the base substrate. The connection line includes a first connection portion, a second connection portion and a third connection portion; in each of the light-emitting sub-units, the third connection portion includes a plurality of connection sub-portions, each of the connection sub-portions includes at least one electrical contact point; the electrical contact points at adjacent ends of adjacent connection sub-portions constitute an electrical contact point pair.

Abstract: A parking brake control method for an electromechanical brake system of an urban rail vehicle includes an operation instruction mechanism, a brake control mechanism, an electromechanical actuating mechanism and an auxiliary mechanism. The operation instruction mechanism outputs a control signal to the brake control mechanism to drive the action of the electromechanical actuating mechanism so as to achieve braking application and relief of the vehicle. The auxiliary mechanism is used for a redundant power supply system of a brake system. The auxiliary mechanism further includes a zero-speed state monitoring mechanism for monitoring a zero-speed state of the vehicle and an energy storage battery mechanism for providing a backup power supply. The parking brake control method enables an urban rail vehicle using an electromechanical brake system to achieve brake application and relief in a parked state and achieve brake application and relief in a dormant state of the urban rail vehicle.

Abstract: A beam tracking method and apparatus, describes that, during vehicle platooning, following vehicles have a low reliability of receiving a beam signal and a low speed of discovering a beam signal. Said method includes: receiving first position information of a designated vehicle obtaining, on the basis of the first position information and second position information of a following vehicle, relative position information of the designated vehicle and the following vehicle; and tracking, according to the relative position information, a beam transmitted by the designated vehicle.

Abstract: A polyurethane adhesive composition, such as a two-component polyurethane adhesive, including (A) at least one isocyanate group-containing component including at least one isocyanate group-containing compound; and (B) at least one polyol component including: (Bi) at least one polyester polyol compound; and (Bii) at least one phosphate ester polyol compound; and a process for making the above composition.

Abstract: A two-component adhesive composition comprising the reaction product of: a polyol component, comprising a hydrophobic polyol and a phosphate-functional adhesion promoter; and an isocyanate component, comprising the reaction product of an isocyanate monomer and a dimer acid polyester polyol.

Abstract: The present disclosure provides a two-component solvent-less adhesive composition. The two-component solvent-less adhesive composition contains the reaction product of (A) an isocyanate component containing the reaction product of (i) an isocyanate monomer and (ii) a first dimer acid polyester polyol; and (B) a polyol component containing (i) a second dimer acid polyester polyol and (ii) optionally, a polyol selected from a polyether polyol, a polyester polyol, and combinations thereof. The two-component solvent-less adhesive composition contains from 15 wt % to 45 wt % units derived from dimer acid, based on the total weight of the two-component solvent-less adhesive composition.

Abstract: A backplane and a glass-based circuit board. The backplane includes: a base substrate and a plurality of light-emitting units, arranged in an array on the base substrate. Each of the light-emitting units includes at least one light-emitting sub-unit; the light-emitting sub-unit includes a connection line and a plurality of light-emitting diode chips connected with the connection line, and the light-emitting diode chips are located on a side of the connection line away from the base substrate. The connection line comprises a first connection portion, a second connection portion and a third connection portion; in each of the light-emitting sub-units, the third connection portion comprises a plurality of connection sub-portions, each of the connection sub-portions comprise at least one electrical contact point; the electrical contact points at adjacent ends of adjacent connection sub-portions constitute an electrical contact point pair.

Abstract: A task processing method and apparatus, an electronic device, a storage medium and a program product are provided. The method includes: receiving a remote shuffling service request of a target task, and generating a topological graph of the target task according to execution flow information of the target task in response to a remote system service request of the target task, the topological graph including a plurality of target nodes, and each target node corresponding to at least one subtask of the target task; matching information of the target node with information of at least one historical node to obtain a first matching result; sifting the target historical task based on a preset attribute condition; and determining, based on a sifting result, execution parameter recommendation information for the target task as a processing result of the remote shuffling service request.

Abstract: A home device control method and a device. When detecting that the home device meets a preset condition, the electronic device sends a second message to the home device, to indicate the home device to use a first antenna and to indicate to obtain a random code; receives the random code sent by the home device by using the first antenna; accesses a wireless local area network based on the random code, and obtains configuration information including an interface element of a control page and a control instruction that are used to control the home device; and displays the control page and interacts with a user by using the control page, and sends the control instruction to the home device through the wireless local area network, to control the home device.

Abstract: An adhesive composition comprising: (A) an acrylic emulsion polymer; and (B) a vinyl aromatic monomer-maleic anhydride copolymer is provided, wherein (B) vinyl aromatic monomer-maleic anhydride copolymer is present at an amount of 0.1% by weight to 6.5% by weight, based on the total solid weight of the adhesive composition. The adhesive composition provides improved performances in terms of bonding strength and/or heat seal performance.

Abstract: This disclosure provides methods and apparatuses relating to device control right obtaining. One method is applied to a system including a first device and a second device. The first device detects that the second device approaches the first device, the first device sends a first key to the second device. After receiving the first key, the second device encrypts a control instruction by using the first key, where the control instruction is used to control the first device. The second device sends the encrypted control instruction to the first device, and the first device decrypts the encrypted control instruction to obtain the control instruction and executes the control instruction.

Abstract: The present invention provides an application of a small-molecule compound in preparation of an antitumor drug. A series of small-molecule drugs with high brain tumor growth activity inhibitory properties are obtained, are docked to pharmacodynamic analysis of the small-molecule drugs, and do not need to be transferred to other testing platforms.

Abstract: A facial recognition method using online sparse learning includes initializing target position and scale, extracting positive and negative samples, and extracting high-dimensional Haar-like features. A sparse coding function can be used to determine sparse Haar-like features and form a sparse feature matrix, and the sparse feature matrix in turn is used to classify targets.

Abstract: The present disclosure describes techniques of providing data consistency for hybrid transactional and analytical processing. Logical logs and log serial numbers (LSNs) associated with the logical logs may be generated based on data captured by a first processing engine. The logical logs and the LSNs may be propagated to a storage subsystem configured to be in communication with the first processing engine and a second processing engine. The LSNs and information indicative of LSN schema versions may be stored and distributed by a metadata service. The first processing engine, the second processing engine, the storage subsystem and the metadata service are modularized, and support a LSN mechanism for maintaining data consistency.

Abstract: A vehicle body contour-based derailment detection method for a rail vehicle, including: measuring distances between measuring points and rails through a range finder mounted on an underframe of a vehicle body, and calculating a transverse displacement of the current vehicle body in a vehicle body coordinate system; measuring an inclination angle of the current vehicle body in the vehicle body coordinate system through an inclination sensor on the vehicle body; with reference to a size of the vehicle body and distribution positions of the measuring points, as well as the transverse displacement of the current vehicle body in the vehicle body coordinate system and the inclination angle of the vehicle body in the vehicle body coordinate system, obtaining a dynamic outer contour of the vehicle body in the vehicle body coordinate system and converting it into a dynamic outer contour in the rail coordinate system.