Abstract: A flexible printed circuit board includes a coil for near-field communication (NFC) and circuit components for performing other functions such as driving a display panel. By integrating the NFC coil into the flexible printed circuit board, the number of components in an electronic device may be reduced. A ferrite sheet is provided below the NFC coil to enhance the performance of NFC signal reception and transmission. A conductive layer is provided below the ferrite sheet to prevent interference with circuits on a printed circuit board below the flexible printed circuit board.

Abstract: A power amplifier including a gate bias circuit that comprises a first power supply interface and a second power supply interface, a drain bias circuit, and a power transistor. A specific voltage difference exists between a first voltage signal received by an input end of the first power supply interface and a second voltage signal received by an input end of the second power supply interface. A gate of the power transistor is configured to receive a radio frequency signal carrying a plurality of signal slice symbols. When a first signal slice symbol carries valid data, the gate is coupled to an output end of the first power supply interface. When the first signal slice symbol carries no valid data or no radio frequency signal is received, the gate is coupled to an output end of the second power supply interface.

Abstract: This application provides a power amplification system comprising a hybrid coupler, a first amplifier, a second amplifier, a first impedance conversion line, and a second impedance conversion line. An output port of the first amplifier is coupled to the hybrid coupler via the first impedance conversion line. An output port of the second amplifier is coupled to the hybrid coupler via the second impedance conversion line. The first amplifier and the second amplifier are configured to output radio frequency signals. The hybrid coupler is configured to: perform impedance conversion with the first impedance conversion line and/or the second impedance conversion line; and output a combined radio frequency signal from a fourth port of the hybrid coupler. The combined radio frequency signal is obtained by combining the plurality of radio frequency signals.

Abstract: A tightly coupled array antenna and a network device are provided. The tightly coupled array antenna includes a first dielectric slab and a plurality of antenna units printed on a lower surface of the first dielectric slab. Each of the antenna units includes a plurality of dipole antennas that are disposed at intervals. Oscillator arms of the dipole antennas are partially hollowed out to reduce both capacitance formed between the oscillator arms and the first dielectric slab and the cross-sectional area of a current path. A plurality of coupling structures is provided on an upper surface of the first dielectric slab so that each of the antenna units is electrically connected to one coupling structure.

Abstract: The invention discloses an information communication management system for rail vehicles, including a communication sub-network module for establishing sub-networks sharing the frequency domain resources of the wireless access network; a communication transmission rate module for calculating a communication transmission rate of users accessing the sub-network; a communication loss requirement module for defining signal transmission path loss and dynamic flow requirement of the rail vehicle; an allocation efficiency module for analyzing frequency domain resource allocation; an allocation optimization module for constructing a frequency domain resource allocation optimization function based on the frequency domain resource allocation efficiency of the wireless access network; and a resource allocation module for allocating frequency domain resources to each sub-network based on the frequency domain resource allocation optimization function and predict the optimal resource allocation state of the sub-network at

Abstract: A data packet transmission method, performed by a first device, includes: determining an Internet Protocol (IP) data packet. The IP data packet comprises a router identifier of a router for transmitting the IP data packet, and a first time corresponding to the router identifier. The first time is time when the router sends the IP data packet.

Abstract: A power converter analog chip includes a sampling circuit configured to collect electrical parameters of the power converter; a maximum power point tracking circuit configured to perform maximum power point tracking based on the input power or the output power obtained by the electrical parameters, and to obtain an adjustment signal; a rapid shutdown circuit configured to, when receiving a rapid shutdown instruction sent from the outside of the analog chip, generate a rapid shutdown signal; a protection circuit, configured to, when an electrical parameter of the power converter exceeds a first preset threshold, generate a protection signal and send the protection signal to the multiplexer; and a multiplexer configured to select one of the rapid shutdown signal, the protection signal, or the adjustment signal as a control signal, to control a power component in the power converter.

Abstract: The invention discloses a method and system for identifying track risks based on big data analysis. The invention uses the YOLO model and SVM classifier to detect the track, extracts the multi-scale features of the track image, and can quickly and effectively detect the deformation and damage positions in the track. Based on the detection results, the RF model and BP neural network are used to further analyze the fault points of the track, and the output of each model is combined to accurately determine the fault points in the track, thereby reducing the misjudgment and omission of the fault points and providing effective support for subsequent inspection path planning. According to the fault points, the inspection path is formulated in combination with the greedy algorithm and the ant algorithm, which can effectively reduce inspection time, improve efficiency and safety of the train operation, and assist in train operation management.

Abstract: Electrochemical conversion of nitrate to ammonia is an approach to alleviate nitrate pollution in water and simultaneously generate green NH3 fuels. The practical application of this approach is challenging due to the lack of efficient electrocatalysts. The present disclosure relates generally to an electrocatalyst including a plurality of CuWO4 hollow nanospheres, which include asymmetric oxygen vacancies and adjacent Mo clusters, and methods of making and using the same. The electrocatalyst of the present disclosure is designed for efficient ammonia electrosynthesis.

Abstract: A power converter box includes at least two power converters, and the at least two power converters include one primary power converter and at least one secondary power converter. The primary power converter obtains status information of a photovoltaic substring corresponding to a secondary power converter, and sends, to an inverter by using a power-line carrier (PLC) communication module in the primary power converter, the status information of the photovoltaic substring corresponding to the secondary power converter and status information of a photovoltaic substring corresponding to the primary power converter. The primary power converter further receives, by using the PLC communication module in the primary power converter, control information sent by the inverter, controls, based on the control information, an output power of the photovoltaic substring corresponding to the primary power converter.

Abstract: A weighted directed graph is initialized with measures corresponding to screened candidates for providing an answer to a question. Candidate scores are calculated via the weighted directed graph. Indirect candidates are grouped based on a secondary analysis performed via the weighted directed graph. Target candidates and candidate groups that contain the indirect candidates are matched via calculations performed via the weighted directed graph, wherein the indirect candidates are suitable for providing an answer to the question.

Abstract: A siphon cooler and a fin thereof are provided. The siphon cooler only includes the fin, or the siphon cooler includes both the fin and a heat sink fin. A compensation cavity with a Tesla valve structure is arranged inside a fin cavity of the fin, and one or more fluid loops are formed in cavities of a cooling base plate and the fin, such that a liquid working medium and a gaseous working medium flow smoothly in the fluid loops.

Abstract: This application provides a direct current converter, including a first BUCK circuit, a second BUCK circuit, a charge pump circuit, a drive circuit, a controller, and a power conversion circuit. A photovoltaic module is connected to the power conversion circuit. The power conversion circuit is connected to an inverter. A direct current output by the power conversion circuit is converted into an alternating current via the inverter, and the alternating current is connected to a power grid. The direct current converter implements maximum power point tracking of the photovoltaic module. The first BUCK circuit provides a first power supply for the drive circuit, and provides a power supply for the charge pump circuit. The charge pump circuit provides a second power supply for the drive circuit. The second BUCK circuit provides a power supply for the controller.

Abstract: Provided in the present disclosure are a paging method and apparatus, and a storage medium. The paging method includes: determining that entry into a target sleep state is required, and transmitting an assisted paging request to at least one second terminal device; and determining that a target terminal device of the at least one second terminal device accepts the assisted paging request, and entering the target sleep state.

Abstract: A method for detecting a stress state-of rocks surrounding a roadway based on three-dimensional electric potential response is disclosed. By collecting electric potential data, and performing spatial interpolation on all the electric potential measurement points to obtain a three-dimensional electric potential imaging volume, three-dimensional electric potentials can be used to draw electric potential isosurface models. By using a radial basis function surface interpolation method to draw a three-dimensional abnormal electric potential inversion probability isosurface model, it is possible to intuitively visualize electric potential distribution spatial characteristics of rocks surrounding a roadway, so as to clearly display a spatial range, direction and development trend of abnormal stress zones, and accurately identify and determine the stress states of roadway rock formations.

Abstract: A metasurface unit includes a metal radiation patch with a gap, an upper-layer dielectric plate, a metal ground layer, a lower-layer dielectric plate, and a feed structure arranged in sequence from top to bottom. One end of the feed structure is connected to the metal radiation patch, and another end of the feed structure is arranged on a bottom layer of the lower-layer dielectric plate through a feed through hole. The feed through hole passes through the upper-layer dielectric plate, the metal ground layer and the lower-layer dielectric plate in turn. The metal radiation patch is rotatable around a central axis. Different included angles between the gap and a positive direction of an X-axis correspond to different polarization states.

Abstract: A vehicle control method and apparatus, an electronic device, and a storage medium relate to the field of vehicle control technologies. The method includes: obtaining a road surface coefficient of a road on which a vehicle is traveling according to speed parameters of the vehicle during traveling, wherein the road surface coefficient represents a flatness degree of a road surface; determining whether the vehicle is currently traveling on a bumpy road according to the road surface coefficient; in response to determining that the vehicle is currently traveling on a bumpy road, determining at least one bump level covered by the bumpy road; and controlling an operation of the vehicle according to the at least one bump level.

Abstract: The present disclosure relates to a data transmission method, a data transmission device, and a storage medium. The data transmission method is characterized by being applied to a data generation end. The method includes: determining the number of Internet Protocol (IP) data packets, wherein the number of the IP data packets comprises a first number and a second number; and within a first data transmission period, transmitting a first type of data on the basis of the first number, and transmitting a second type of data on the basis of the second number.

Abstract: The present disclosure provides a high-voltage box power supply system and an energy storage system, where the high-voltage box power supply system is applied to the energy storage system and includes: a power supply; and a plurality of high-voltage boxes; where the power supply is electrically connected to one of the plurality of high-voltage boxes, and the plurality of high-voltage boxes are electrically connected to each other in sequence, so that the power supply supplies power to the plurality of high-voltage boxes.

Abstract: An application method for an application function includes: receiving, by an application repository function (APRF), an application function (AF) calling request sent by a first network function (NF), in which, the calling request includes a first type identifier of an AF to be used; traversing, by the APRF, a preset AF data table based on the first type identifier, wherein the AF data table stores description information of available AFs; and sending, by the APRF, description information of a first AF to the first NF in response to the description information of the first AF in the AF data table comprising the first type identifier.