Abstract: A method includes displaying a list interface including a first container prop that contains a first pet virtual character and a second container prop that does not contain a pet virtual character. The method further includes, in response to a touch selection operation corresponding to selecting one of the first container prop or the second container prop, displaying an aiming interface corresponding to the selected one of the first container prop or the second container prop and displaying an aiming sight. The method further includes, in response to a touch aiming operation on the aiming interface, adjusting a position of the displayed aiming sight. The method further includes, when the first container prop is selected, displaying throwing the first pet virtual character in response to a touch throwing operation, and when the second container prop is selected, displaying throwing the second container prop in response to the touch throwing operation.

Abstract: A method and device of data transmission, applied to a distributed database is provided including a plurality of nodes, with accelerator cards provided in at least two of the nodes, the high-speed interfaces of each the accelerator card is interconnected to form a data transmission path, the method including: when the accelerator card receives a database operation command from the CPU of the node requesting access to the target data, generating a data request based on the get data operation or the modify data operation; the accelerator card detects hit the target data in the cache based on the data request, the accelerator card fetches the target data from the cache; otherwise the accelerator card sends a data request message corresponding to the data request to a distant destination node via the data transmission path, and obtains the target data based on the data packet returned from the destination node.

Abstract: The present disclosure discloses a method for constructing an efficient Bacillus subtilis promoter, and belongs to the technical field of gene engineering. According to the present disclosure, natural promoters identified by different sigma subunits are connected in series to obtain some double-series and triple-series promoters, the lengths of intervening sequences between core areas of the promoters are optimized on the basis of series connection of the promoters to further improve the activity of the promoters, finally, different RBS designs are performed on the promoters, and it is verified that this strategy can not only improve the compatibility between the promoters and other gene expression regulating and controlling elements, but also controllably regulate the expression of exogenous genes.

Abstract: The disclosure discloses a mutant of nitrile hydratase derived from Caldalkalibacillus thermarum, and belongs to the technical field of enzyme engineering. The nitrile hydratase mutant Cal. t Nhase-A20V provided by the disclosure has a half-life of about 10 min at 70° C., which does not change much compared with the thermal stability of the wild enzyme. The specific enzyme activity of the mutant Cal. t Nhase-A20V is 128% of that of the wild enzyme. At the same time, the mutant also has better tolerance to a substrate and a product, and the final yield of nicotinamide produced by whole-cell catalysis reaches 598 g/L. Therefore, the nitrile hydratase mutant Cal. t Nhase-A20V provided by the disclosure has good enzymatic properties and is beneficial to future industrial production.

Abstract: A method and device for storing data in a distributed database according to a row storage mode and a column storage mode, respectively, the method including: when a change is detected in the data in the row storage mode, obtaining the target row data that has changed based on a preset synchronization policy; determining the number of original data copies and the number of redundant data copies based on the attribute information and the number of failure-resistant nodes of the target row in which the target row data is located; coding the target row data in accordance with a predetermined corrective coding algorithm based on the number of original data copies and the number of redundant data copies, generating coded data; and distributing each copy of the coded data equally by column or group of columns to different nodes in the distributed database for storage.

Abstract: A method and device for accelerating database operation, applied to a database connected with a hardware accelerator is provided, the method includes: when receiving an initial execution plan tree sent by the database that needs to be accelerated, processing the initial execution plan tree and generating a new execution plan tree and a new execution cost based on the basic operation and accelerated resource supported by the hardware accelerator; if the new execution cost of the new execution plan tree is less than the initial execution cost of the initial execution plan tree, distributing the new execution plan tree to the hardware accelerator for execution based on the organization approach and the operation approach of the hardware accelerator; the execution result returned by the hardware accelerator to complete the accelerated operation of the database operation; determining the result data after the hardware accelerator accelerates the database operation based on the execution results returned by the har

Abstract: A system and method for hierarchical database operation accelerator for scaling a single node database with a plurality of accelerator cards is provided, including: a host, receiving a query plan, generating a corresponding query operation and distributing them, receiving and processing aggregated execution results; a hierarchy accelerator module, which is connected to the host, receiving the query operation distributed and returning the aggregated execution results; the hierarchy accelerator module comprises a master accelerator card and at least one slave accelerator card, the slave accelerator card returns the execution results to the master accelerator card, by the master accelerator card completes the subsequent query operation which is aggregated and assigned by the execution results, returning the aggregated execution results to the host; the accelerator system having a multi-level storage architecture of accelerator chip on-chip cache, the accelerator card memory, the accelerator card storage, and the

Abstract: A method for preparing polymer includes the steps of enabling olefin and unsaturated carboxylate be subjected to a polymerization reaction in the presence of a catalyst to generate an olefin-unsaturated carboxylate polymer. The catalyst has a primary catalyst and optionally a cocatalyst. The primary catalyst has at least one complex represented by formula I, formula I?, or formula I?. By selecting a reacted unsaturated carboxylate monomer, catalysts, and a suitable polymerization process, a spherical and/or sphere-like polymer having good shape is directly prepared without subsequent processing steps such as granulation, and the obtained polymer product is not prone to fouling in a reactor and is convenient for transportation.

Abstract: A branched olefin polymer, a preparation method therefor and the use thereof are provided. The branched olefin polymer is obtained by polymerizing at least one C4-C20 nonterminal olefin monomer with optional ethylene, propylene, and C4-C20 terminal olefin monomers; and the branched olefin polymer has the following characteristics: (a) a molecular weight of 20000 to 500000 g/mol; (b) a molecular weight distribution of 3.5 to 6.0, and a bimodal structure characterized by GPC; (c) a melting point of 0° C. to 110° C. and a glass-transition temperature of ?80° C. to ?50° C.; and (d) having 20 to 200 methyl groups per 1000 methylene groups.

Abstract: A solid component for preparing an olefin polymerization catalyst, and a preparation method therefor and an application thereof are provided. The solid component contains: (i) a magnesium compound as represented by the following formula (1), (ii) a Lewis base (LB), and optionally, (iii) metal components other than magnesium. The LB is a compound as shown in general formula (II) or an amide compound as shown in general formula (II?). The solid component has a better particle morphology, and a catalyst prepared by using the solid component as a carrier is less likely to be crushed, and has better stereostructural orientation in olefin polymerization, particularly in propylene polymerization or copolymerization.

Abstract: A spherical carrier for olefin polymerization catalysts has at least one magnesium-containing compound having a structure represented by formula (1). The spherical carrier has a relatively good particle morphology, and substantially no abnormally morphological particles will appear. A method for preparing the spherical carrier can be used to prepare a carrier having a small particle size and greatly expands the particle size range of the preparable carrier. When the catalyst prepared by using the carrier is used for olefin polymerization, polymerization activity is good, substantially no abnormally morphological material is present, and hydrogen response is good.

Abstract: A catalyst system for olefin polymerization contains a main catalyst and a cocatalyst. The cocatalyst contains a twelve-membered ring compound represented by formula (M). The catalyst system is suitable for preparing polypropylene products having high stereoregularity and low ash, and can regulate the melt index of the products within a wide range by adjusting the amount of hydrogenation. It is also suitable for copolymerization systems to improve the copolymerization yield.

Abstract: A copolymer contains, based on the total amount of structural units of the copolymer, 90-99 mol % of propylene structural units and 1-10 mol % of butene structural units. The xylene solubles content of the copolymer is less than or equal to 4 wt %, and preferably less than or equal to 3 wt %. The propylene-butene copolymer is substantially free of fraction having a molecular weight lower than 1000. The copolymer has a melt flow index of greater than or equal to 20 g/10 min as measured at 230° C. under a load of 2.16 kg. The propylene-butene copolymer has a high melt flow index and few xylene solubles, and does not contain a phthalate-type plasticizer, and can be used in fields such as food and medical and health services.

Abstract: A magnesium-based solid, by means of determination based on a nitrogen adsorption method, has a multimodal pore distribution and a specific surface area of not less than 50 m2/g, and the pore size distribution of the solid is in a range of 1 nm to 300 nm. There is at least one peak within a pore size range of less than 10 nm, and there is at least another peak within a pore size range of not less than 10 nm. A catalyst is formed using the solid catalyst component is used for propylene polymerization.

Abstract: A preparation method for a copolymer includes the step(s) of contacting an olefin and an unsaturated carboxylic acid shown in Formula II or a derivative of the unsaturated carboxylic acid shown in Formula II with a catalyst and optionally a chain transfer agent for reaction in the presence of an alkane solvent to obtain the copolymer. The copolymer is a spherical and/or spherical-like copolymer.

Abstract: The invention provides an olefin-olefinic alcohol copolymer and a preparation method thereof, said copolymer comprising a spherical and/or spherical-like polymer. The copolymer provided by the invention exhibits a good morphology and has good prospects in industrial use.

Abstract: An amino-imine metal complex represented by Formula I, its preparation method and an application thereof are provided. The complex is used as a main catalyst in catalysts for olefin polymerization, and can catalyze the polymerization of ethylene at a relatively high temperature to prepare branched polyethylene having high molecular weight.

Abstract: A method for preparing an olefin-olefinic alcohol copolymer and an olefin-olefinic alcohol copolymer prepared by the method are provided. The catalyst used in the method for preparing the olefin-olefinic alcohol copolymer has a diimine metal complex as shown in Formula I.

Abstract: A diimine metal complex represented by Formula I, a preparation method therefor, and application thereof are provided. The complex is used as a main catalyst in catalysts for olefin polymerization, and can achieve catalytic ethylene polymerization at a high temperature to prepare high molecular weight branched polyethylene.

Abstract: A catalyst system for olefin polymerization contains a main catalyst and a cocatalyst. The cocatalyst contains a twelve-membered ring compound represented by formula (M). The catalyst system is suitable for preparing polypropylene products having high stereoregularity and low ash, and can regulate the melt index of the products within a wide range by adjusting the amount of hydrogenation. It is also suitable for copolymerization systems to improve the copolymerization yield.