Abstract: Provided are a system and a method for impact testing and monitoring of a high-energy flexible net. The system includes a vertical impact testing unit, a slope impact testing unit, an impact simulation unit, and an impact monitoring unit. The vertical impact testing unit includes a vertically positioned gravity wall. The slope impact testing unit includes a wall slope positioned perpendicularly to a second side of the gravity wall. A first side of the gravity wall and a slope surface of the wall slope are securely provided with a flexible net, respectively. The impact simulation unit includes an impact assembly and a lifting assembly. The impact monitoring unit is configured to monitor a deformation result and an internal force change result of the flexible net.

Abstract: A common-mode voltage injection control method and apparatus for an inverter. For the method and apparatus, a common-mode voltage for a DPWM mode is calculated based on three-phase port voltages and an output power command; a common-mode voltage for an MPC modulation mode is calculated based on the direct current bus voltage, the three-phase port voltages, and the output power command; a modulation proportion is determined based on a maximum phase voltage peak value of the three-phase port voltages, the direct current bus voltage, and a power factor of the output power command; and a common-mode injection voltage is generated based on the common-mode voltage for the DPWM mode, the modulation proportion, and the common-mode voltage for the MPC modulation mode.

Abstract: Certain aspects of the present disclosure provide techniques for securely accessing a wallet on a blockchain. An example method generally includes receiving a request to access a wallet on a blockchain. The request generally includes an authorization code associated with the wallet and user credentials associated with an owner of the wallet. A first portion of a private key is decrypted based on the authorization code and a salt associated with the user credentials, and a second portion of the private key is decrypted based on credentials associated with an application through which the wallet is accessed. Access to the wallet is granted based on the decrypted first portion and the decrypted second portion of the private key.

Abstract: A recycling method of waste lithium manganate cathode materials is provided. The recycling method includes: firstly, mixing the waste lithium manganate cathode materials with sulfuric acid for hydrothermal reaction, to obtain manganese dioxide and washing solution; then reacting the washing solution with ammonium bicarbonate, to obtain manganese carbonate and lithium sulfate; and mixing the manganese dioxide, lithium sulfate and lithium hydroxide monohydrate, then performing a sintering treatment, washing and a tempering treatment in sequence, to obtain recycled lithium manganate cathode materials. The recycling method can obtain manganese dioxide, spherical manganese carbonate and lithium sulfate by adjusting the reaction temperature and reaction time, realizing the effective recovery of manganese and lithium.

Abstract: The disclosure provides a chain-link converter, comprising: a first node; a second node; and a plurality of switch submodules, wherein the plurality of switch submodules are connected in series, and the plurality of switch submodules are electrically connected between the first node and the second node, and a switching time of at least one switch submodule is greater than the switching time of other switch submodules. The chain-link converter of the disclosure effectively suppresses the common-mode current by extending the switching time of at least one switch submodule.

Abstract: Building and using a smart contract in order to resolve the isolation between database users and service operators for hyper-protect database as a service (DBaaS). The use of the smart contract in the hyper-protect DBaaS environment allows the service operator to perform operations on sensitive and secure data in the database owned by a user without necessarily revealing the content of the sensitive and secure data.

Abstract: A power converter includes a power conversion circuit, a bus capacitor, and a controller. A direct current input end of the power conversion circuit is configured to connect to a direct current power supply through a direct current bus. An alternating current output end of the power conversion circuit is configured to connect to an alternating current power grid through a point of common coupling (PCC). The controller is configured to: in response to that a difference between a voltage across two ends of the positive bus capacitor and a voltage across two ends of the negative bus capacitor is greater than a specified threshold, control the power converter to inject a second harmonic current into the alternating current power grid, to reduce the difference between the voltage across the two ends of the positive bus capacitor and the voltage across the two ends of the negative bus capacitor.

Abstract: A gearshift overlap control system and a control method for improving vehicle dynamic response includes a gearshift progress calculation module: the gearshift progress calculation module is capable of calculating a gearshift progress in real time; a clutch control module: the clutch control module is capable of executing a first power-on downshift control and starting to perform a second power-on downshift control when a set second power-on downshift in a corresponding gearshift progress is requested; and an iterative learning control module: the iterative learning control module is capable of automatically adjusting a first on-coming clutch control pressure and a first off-going clutch control pressure in the first power-on downshift by means of monitoring the overshoot of the gearshift progress.

Abstract: A configuration evaluation method and a platform for electromechanical coupling transmission of hybrid electric vehicles, includes an energy flow transfer path evaluation module for evaluating the energy flow transfer path, an electromechanical coupling transmission dynamic performance evaluation module for evaluating the dynamic performance of electromechanical coupling transmission, an electromechanical coupling transmission economic efficiency evaluation module for evaluating the economic efficiency of electromechanical coupling transmission, an electromechanical coupling transmission driving cycle adaptability evaluation module for evaluating the driving cycle adaptability of electromechanical coupling transmission, a component feature parameter rationality evaluation module for evaluating the rationality of component feature parameters, a structure and cost evaluation module for evaluating the structure and cost, and a comprehensive evaluation module for performing a comprehensive evaluation.

Abstract: A method for treating battery positive electrode material includes: cold plasma treatment of at least part of the battery positive electrode material with carbon layer on the surface to be treated to have active particles doped in the carbon layer, where the doping amount is not less than 50 ppm (Part per million). At least part of the surface of the positive electrode material of the battery contains a carbon layer and at least part of the surface has a rod-like shape. The carbon layer is a carbon layer doped with active particles after cold plasma treatment, and a high-sodium ion conductance NaF layer is formed on the surface of the positive electrode material.

Abstract: A configuration evaluation method and a platform for electromechanical coupling transmission of hybrid electric vehicles, includes an energy flow transfer path evaluation module for evaluating the energy flow transfer path, an electromechanical coupling transmission dynamic performance evaluation module for evaluating the dynamic performance of electromechanical coupling transmission, an electromechanical coupling transmission economic efficiency evaluation module for evaluating the economic efficiency of electromechanical coupling transmission, an electromechanical coupling transmission driving cycle adaptability evaluation module for evaluating the driving cycle adaptability of electromechanical coupling transmission, a component feature parameter rationality evaluation module for evaluating the rationality of component feature parameters, a structure and cost evaluation module for evaluating the structure and cost, and a comprehensive evaluation module for performing a comprehensive evaluation.

Abstract: The present disclosure provides a display module and a display device. The display module includes: a circuit board including a first surface and a second surface opposite to the first surface; a display substrate on the first surface of the circuit board; a first glue layer on the first surface of the circuit board and surrounding the a sidewall of the display substrate; and a second glue layer on the second surface of the circuit board, wherein a transparency of the second glue layer is different from a transparency of the first glue layer.

Abstract: The present invention provides a gearshift overlap control system and a control method for improving vehicle dynamic response; the control system includes a gearshift progress calculation module: the gearshift progress calculation module is capable of calculating a gearshift progress in real time; a clutch control module: the clutch control module is capable of executing a first power-on downshift control and starting to perform a second power-on downshift control when a set second power-on downshift in a corresponding gearshift progress is requested; and an iterative learning control module: the iterative learning control module is capable of automatically adjusting a first on-coming clutch control pressure and a first off-going clutch control pressure in the first power-on downshift by means of monitoring the overshoot of the gearshift progress.

Abstract: A power converter control method includes: determining a phase angle difference between a phase angle of a voltage output by the power converter and a phase angle of a power grid voltage; and if the phase angle difference is greater than or equal to a first angle threshold, setting a d-axis current reference value and a q-axis current reference value that are used to determine a modulation voltage of the power converter to preset fixed values; calculating a first modulation voltage of the power converter based on the d-axis current reference value, the q-axis current reference value, and a power grid current; calculating a compensation voltage of the power converter based on a preset virtual resistance parameter and the power grid current; and using a sum of the first modulation voltage and the compensation voltage as a total modulation voltage.

Abstract: Methods, systems, and computer-readable storage media for receiving a query request including authorization data and a query, the authorization data indicating a privilege level index, determining a set of row ranges based on the privilege level index and a row range table, the set of row ranges including one or more row ranges having a privilege level associated therewith in the row range table, providing an initial results set including one or more records of a data table that are determined to be responsive, determining a final results set including at least one record of the initial results set, the at least one record being included in the final results set in response to determining that the at least one record is included in a row range of the set of row ranges, and outputting the final results set as at least a portion of a query result.

Abstract: A communication method includes a first network device that receives a service packet from a first endpoint device, where a destination media access control (MAC) address of the service packet is a specific local MAC address of a second endpoint device, the specific local MAC address includes an indication prefix and location information, the indication prefix indicates that the specific local MAC address includes the location information, and the location information indicates an access location of an endpoint device in a network. The first network device determines an egress port from a preset routing table based on the location information in the specific local MAC address of the second endpoint device, and sends the service packet through the egress port, where the routing table includes the location information and the egress port corresponding to the location information.

Abstract: A breeding method for rapidly stabilizing cotton distant hybridization progeny is disclosed. It belongs to the technical field of plant breeding. The disclosure is based on VSG (G. barbadense semi-compatible material) as female parent, general G. hirsutum materials as male parent of the cross to get F1 generation of G. barbadense-G. hirsutum hybrid materials, and treats the F1 generation of young bolls with 0.03-0.05% of colchicine aqueous solution to induce F2 generation to separate the stable intermediate materials or new varieties with excellent genes of both G. barbadense and G. hirsutum, so as to produce new cotton germplasm resources. The main innovation of the present disclosure lies in that it changes the previous treatment position and method of colchicine on cotton plant, and the disclosure is not limited by haploid and directly treats the cotton bolls on F1 cotton plants.

Abstract: This application discloses a photovoltaic system and a carrier wave signal synchronization method. The photovoltaic system includes a plurality of inverters and a controller. Each inverter in the photovoltaic system inverts a direct current into an alternating current based on a received carrier wave signal, and transmits the alternating current to a power grid. The controller obtains first output currents of the plurality of inverters in an adjustment period, so that the controller can obtain first output current valid values of the plurality of inverters based on the first output currents of the plurality of inverters.

Abstract: Methods, systems, and computer-readable storage media for providing a first instance of a database system within the cloud computing environment, determining that scale out of the database system is to be executed, and in response, providing a second instance of the database system within the cloud computing environment, the first instance and the second instance collectively defining a cluster, establish a remote direct memory access (RDMA) connection between the first instance and the second instance, copying data stored within the first instance to a data store of the second instance over the RDMA connection, and configuring the first instance to replicate a first transaction log to the second instance over the RDMA connection, and receiving, by each of the first instance and the second instance, requests from one or more client devices.

Abstract: A power line communication (PLC) system includes a PLC signal transmitting end, a PLC signal receiving end, and a power electronic apparatus. The PLC signal transmitting end is connected to the PLC signal receiving end through a power line, and the power electronic apparatus is connected to the power line. The power electronic apparatus is configured to increase output impedance in a first PLC communication frequency band, to reduce interference from an output current of the power electronic apparatus to a PLC signal in the first PLC communication frequency band. The first PLC communication frequency band is a PLC communication frequency band in which the PLC signal transmitting end sends the PLC signal to the PLC signal receiving end. In this way, the interference from the power electronic apparatus to the PLC signal in the first PLC communication frequency band can be reduced without adding an additional passive filter.