Abstract: This specification provides an online evolution method and apparatus for an execution plan, a device, and a storage medium. The method includes: In response to a received current database request including a target database statement, an evolution task is obtained from a plan cache corresponding to the target database statement. A type of an execution plan actually used by the database request is selected, so that an accumulative quantity of execution times of each type of execution plan in an implementation process of the evolution task is positively correlated with performance of each type of execution plan. After the evolution task ends, if it is determined that performance of a current execution plan of an evolution type is better than performance of an execution plan of a baseline type, the execution plan of the evolution type is changed into an execution plan of the baseline type corresponding to the target database statement.

Abstract: The present application relates to the field of database technologies, and provides a data query method and apparatus, an electronic device, and a storage medium. The data query method includes: obtaining a first query statement to be queried; determining, based on the first query statement, a first data table and a second data table to be used for an inner join operation, a first join column to be used for the inner join operation in the first data table, and a second join column to be used for the inner join operation in the second data table; determining, based on the first query statement, whether the first join column and the second join column satisfy a data pushdown condition; in response to determining that the data pushdown condition is satisfied, updating the first query statement to obtain a second query statement; and performing data query on the first data table and the second data table based on the second query statement, to obtain a data query result.

Abstract: A method for preparing a stacked solid aluminum electrolytic capacitor is disclosed. The method includes preparation of a plurality of cores, stacking and fixing of the plurality of cores in a case and encapsulation of the case. The core is prepared through the following steps. An I-shaped aluminum foil is divided into an anode part and a cathode part by applying an insulating blocking tape, where the cathode part includes a dielectric layer, which is subjected to formation. A conductive polymer layer is formed on a surface of the cathode part, and is then impregnated with conductive colloidal graphite followed by drying to form a conductive carbon paste layer. The conductive carbon paste layer is impregnated with a conductive silver paste followed by drying to form a conductive silver paste layer. After that, a core is obtained.

Abstract: A core includes an aluminum foil, a first insulating plate and a second insulating plate. The first insulating plate and the second insulating plate are insulatedly bonded to opposite two sides of the aluminum foil, respectively. A middle of each of the first insulating plate and the second insulating plate is provided with a rectangular hollow portion. A surface of the hollow portion is sequentially provided with a conductive polymer layer, a conductive carbon paste layer and a conductive silver paste layer from inside to outside. A multilayer solid aluminum electrolytic capacitor, including N cores, a conductive frame, a rivet, a substrate and a resin casing, is also provided. This application also provides a method for preparing the multilayer solid aluminum electrolytic capacitor.

Abstract: A cigarette device management system includes an information management module, and a maintenance prediction module, a device state acquisition module and a purchase statistics module which are in communication connection with it. The maintenance prediction module is built by an artificial neural network model and is configured to predict a failure interval. The device state acquisition module acquires a device operating parameter and an operating duration of the device in real time, and compares the device operating parameter with a safety parameter range. In accordance with the system, the maintenance timing of the device can be predicted, the purchase quantity of the spare part and the purchase timing of the spare part also can be predicted.

Abstract: This specification discloses database service execution methods and apparatuses. An object deletion request can be received, and a to-be-deleted object can be determined. However, the to-be-deleted object is not immediately deleted, but an operation permission for the to-be-deleted object is modified, and a user is prohibited from accessing the to-be-deleted object. When an object restoration request that carries an object identifier is received, a to-be-deleted object corresponding to the object identifier is determined from each to-be-deleted object whose operation permission has been modified; and an operation permission for the to-be-deleted object corresponding to the object identifier is modified, and the user is allowed to access the to-be-deleted object corresponding to the object identifier.

Abstract: Embodiments of this application provide a terminal device, including a middle frame, a heat source device, a first heat dissipation assembly, and a second heat dissipation assembly, where the first heat dissipation assembly is disposed on one side of the middle frame, the heat source device and the second heat dissipation assembly are disposed on the other side of the middle frame, and at least one of the first heat dissipation assembly and the second heat dissipation assembly is a graphene heat dissipation assembly.

Abstract: The present disclosure provides compositions comprising anti-LMP2 TCR-T cell populations for the treatment of EBV-associated cancers and methods of making and using same.

Abstract: A core includes an aluminum foil, a first insulating plate and a second insulating plate. The first insulating plate and the second insulating plate are insulatedly bonded to opposite two sides of the aluminum foil, respectively. A middle of each of the first insulating plate and the second insulating plate is provided with a rectangular hollow portion. A surface of the hollow portion is sequentially provided with a conductive polymer layer, a conductive carbon paste layer and a conductive silver paste layer from inside to outside. A multilayer solid aluminum electrolytic capacitor, including N cores, a conductive frame, a rivet, a substrate and a resin casing, is also provided. This application also provides a method for preparing the multilayer solid aluminum electrolytic capacitor.

Abstract: A thienopyrimidine compound (a compound of formula N) and a preparation method therefor are provided. Specifically, the preparation method includes the steps of: (a) in a solvent A, reacting, in the presence of an organic base and acyl chloride, a compound of formula N-2 with 3-amino-6-methoxypyridazine to obtain a compound of formula N-1; and (b) in a solvent B, converting, in the presence of a base, the compound of formula N-1 into the compound of formula N. The preparation method does not require toxic and expensive reagents, has mild reaction conditions and a high product purity, and is suitable for industrial production.

Abstract: The invention discloses a method of preparing a high chiral purity lactam intermediate D comprising a step of reducing a compound C to lactam intermediate D in a solvent by hydrogenation reduction using a heavy metal catalyst and a chiral inducer. Brivaracetam can be prepared in a single step using the lactam intermediate D. The synthesis route is short, reaction conditions are mild, post-treatment is simple, reaction yield is high, chiral selectivity is good, and production cost is low. The conversion rate of the compound C in the reaction is 81%, and the DE value of the compound D is more than 99.0%, which is suitable for industrial production.

Abstract: Embodiments of this application provide a terminal device, including a middle frame, a heat source device, a first heat dissipation assembly, and a second heat dissipation assembly, where the first heat dissipation assembly is disposed on one side of the middle frame, the heat source device and the second heat dissipation assembly are disposed on the other side of the middle frame, and at least one of the first heat dissipation assembly and the second heat dissipation assembly is a graphene heat dissipation assembly.

Abstract: A method for preparing a stacked solid aluminum electrolytic capacitor is disclosed. The method includes preparation of a plurality of cores, stacking and fixing of the plurality of cores in a case and encapsulation of the case. The core is prepared through the following steps. An I-shaped aluminum foil is divided into an anode part and a cathode part by applying an insulating blocking tape, where the cathode part includes a dielectric layer, which is subjected to formation. A conductive polymer layer is formed on a surface of the cathode part, and is then impregnated with conductive colloidal graphite followed by drying to form a conductive carbon paste layer. The conductive carbon paste layer is impregnated with a conductive silver paste followed by drying to form a conductive silver paste layer. After that, a core is obtained.

Abstract: This application provides a multilayer solid aluminum electrolytic capacitor and a method for preparing the same. The multilayer solid aluminum electrolytic capacitor includes a plurality of cores, a rivet, a case, and a cover plate. The cores are stacked in sequence and fastened in the case through the rivet to form a semi-finished capacitor. The semi-finished capacitor is covered by the cover plate and then sealed to form the solid aluminum electrolytic capacitor.

Abstract: This application provides a multilayer solid aluminum electrolytic capacitor and a method for preparing the same. The multilayer solid aluminum electrolytic capacitor includes a plurality of cores, a rivet, a case, and a cover plate. The cores are stacked in sequence and fastened in the case through the rivet to form a semi-finished capacitor. The semi-finished capacitor is covered by the cover plate and then sealed to form the solid aluminum electrolytic capacitor.

Abstract: Systems and apparatuses include a hydraulic suspension system including a front suspension actuator, and a front suspension pressure sensor associated with the front suspension actuator; a tire inflation system; and one or more processing circuits comprising one or more memory devices coupled to one or more processors, the one or more memory devices configured to store instructions thereon that, when executed by the one or more processors, cause the one or more processors to: determine a dynamic weight based on information received from the front suspension pressure sensor of the hydraulic suspension system, determine a current front axle lead ratio based on the dynamic weight, determine a target front axle lead ratio, and control operation of the tire inflation system to adjust from the current front axle lead ratio to the target front axle lead ratio.

Abstract: The invention discloses a method of preparing a high chiral purity lactam intermediate and brivaracetam. The invention provides a method of preparing a lactam intermediate compound represented by molecular formula D, the method comprising a step of reducing a compound C to a lactam intermediate D in a solvent by hydrogenation reduction using a heavy metal catalyst and a chiral inducer. Brivaracetam can be prepared with a single step using the lactam intermediate compound represented by molecular formula D of the present invention. The synthesis route is short, reaction conditions are mild, post-treatment is simple, reaction yield is high, chiral selectivity is good, and production cost is low. The conversion rate of the compound C in the reaction is 81%, and the DE value of the compound D is more than 99.0%, which is suitable for industrial production.

Abstract: A cigarette device management system includes an information management module, and a maintenance prediction module, a device state acquisition module and a purchase statistics module which are in communication connection with it. The maintenance prediction module is built by an artificial neural network model and is configured to predict a failure interval. The device state acquisition module acquires a device operating parameter and an operating duration of the device in real time, and compares the device operating parameter with a safety parameter range. In accordance with the system, the maintenance timing of the device can be predicted, the purchase quantity of the spare part and the purchase timing of the spare part also can be predicted.

Abstract: Described herein are 1,2-dioxetanes that are useful as chemiluminescent probes, diagnostic agents, and imaging agents. Also described herein are compositions containing such compounds and methods of using the same.

Abstract: A lighting fixture is provided. The lighting fixture includes a lamp body, a light source component and an optical element; the lamp body and the optical element form a closed cavity, the light source component is accommodated in the closed cavity; the light source component includes a light source substrate and a light emitting unit located on a front surface of the light source substrate, and the optical element is located in a light emission direction of the light emitting unit; the light source substrate includes a back surface facing away from the front surface, the lamp body is formed with a heat dissipation structure, and the heat dissipation structure is in contact with the back surface of the light source substrate. The lighting fixture provided by the present disclosure has good heat dissipation performance.