Abstract: An electrically-driven fracturing system, which includes a main power generation device, a first auxiliary power generation device, a switch device, and an electrically-driven fracturing device; the switch device includes a low-voltage switch group and a high-voltage switch group; the electrically-driven fracturing device includes a fracturing motor and a fracturing auxiliary device; a rated generation power of the main power generation device is greater than a rated generation power of the first auxiliary power generation device, a rated output voltage of the main power generation device is greater than a rated output voltage of the first auxiliary power generation device, the high-voltage switch group includes an input end and an output end, and the low-voltage switch group includes an input end and an output end, the input end of the high-voltage switch group is connected to the main power generation device, the output end of the high-voltage switch group is connected to the fracturing motor, the input end

Abstract: An electrically-driven pumping system and a driving method thereof. The electrically-driven pumping system includes: a power generation device, at least one energy storage system, a main motor, a pumping device, an auxiliary device, and a first transformer. The first transformer includes an input end, a first output end, and a second output end, the power generation device is connected to the energy storage unit, the input end of the first transformer is connected to the energy storage unit, the first output end of the first transformer is electrically connected to the main motor, and the second output end of the first transformer is electrically connected to the auxiliary device. As such, the electrically-driven pumping system may avoid problems, such as the shutdown of the main motor caused by power failure of the power generation device, and ensure a continuous operation.

Abstract: This application relates to a galvanometer-based laser synchronization controlling method, calibration method and apparatus, and a LiDAR. The galvanometer-based laser synchronization controlling method includes obtaining a fast-axis feedback signal when a galvanometer scans; obtaining a first phase difference between a fast-axis drive signal and the fast-axis feedback signal and obtaining a second phase difference between an emission period of a laser beam and the fast-axis drive signal; and setting a phase for the fast-axis drive signal based on the first phase difference and the second phase difference.

Abstract: A fracturing device, including a power unit, wherein the power unit comprises a muffling compartment, a turbine engine, an air intake unit, and a starter; the air intake unit is communicated with the turbine engine through an intake pipe, and configured to provide a combustion-supporting gas to the turbine engine; the air intake unit is located at the top of the muffling compartment, the muffling compartment comprises an accommodation space, the turbine engine and the starter are located in the accommodation space, and the starter is configured to start the turbine engine, the starter comprises a first electric motor.

Abstract: This disclosure provides an array substrate and a display device. In the array substrate, the pixel driving circuit includes a driving transistor, a first transistor and a second transistor. The driving transistor and the first transistor are P-type transistors, and the second transistor is N-type transistor. The array substrate also includes a base substrate, and a first conductive layer arranged at a side of the base substrate and including: a first conductive portion forming a gate electrode of the driving transistor; a first gate line at a side of the first conductive portion, a part of the first gate line being configured to form a gate electrode of the first transistor; and a second gate line at a side of the first gate line away from the first conductive portion, a part of the second gate line being configured to form a first gate electrode of the second transistor.

Abstract: A display panel and a display device are disclosed, the display panel comprises: a base substrate; and pixel circuits in an array, the display panel comprises a light transmittance region and a display region around the light transmittance region, the pixel circuits are disposed in the display region, a gate line of each row of m rows of pixel circuits is divided into a first gate line portion and a second gate line portion which are connected through an auxiliary gate line, a data line of each column of n columns of pixel circuits is divided into a first data line portion and a second data line portion which are connected through an auxiliary data line.

Abstract: A liquid-cooling fracturing system includes a fracturing device; a power device connected to the fracturing device through a transmission device and configured to provide power for the fracturing device; a cooling medium storage device configured to store a cooling medium for cooling the power device; and a first heat exchange device, the first heat exchange device using cooling liquid to exchange heat with the cooling medium to cool the cooling medium.

Abstract: A nucleotide sequence is shown in SEQ ID NO.1. The gene encodes mannosyltransferase I. The gene plays an important role in the normal reproductive development of the Nilaparvata lugens (Stål). Inhibition of the function of the gene may reduce the survival rate of the Nilaparvata lugens (Stål) and hinder embryonic development. With respect to reduction of the survival rate of the Nilaparvata lugens (Stål) and hindering of embryonic development, the present invention can reduce the harm of the Nilaparvata lugens (Stål) to rice by killing the Nilaparvata lugens (Stål). By using the characteristic that the nucleotide sequence of a highly conserved target gene has no homology with the nucleotide sequence of natural enemies of the Nilaparvata lugens (Stål), RNA interference is performed at a nucleic acid level, to avoid the harm to non-target organisms such as natural enemies, thereby realizing green control of the Nilaparvata lugens (Stål) while controlling pests.

Abstract: The present invention discloses a semi-trailer-loaded turbine fracturing equipment, which adopts a linear connection of the whole equipment and a special chassis design, so that the center of gravity is double lowered to guarantee its stability and safety, the structure is simpler, the investment and operation costs are decreased, the risk of total breakdown of the fracturing site is reduced, and the equipment has a good transmission performance and is suitable for continuous operation conditions with long time and heavy load.

Abstract: A mixing and discharging device, a mixing and discharging system and a fracturing system are provided. The mixing and discharging device comprises a main shell, an impeller structure and a main shaft. The main shell comprises a top cover; the impeller structure is in the main shell; the main shaft is configured to drive the impeller structure to rotate, penetrates through the top cover and extends into the main shell; a bottom end of the main shaft is in the main shell and is fixed on the impeller structure, and the bottom end of the main shaft is separated from the shell.

Abstract: A LiDAR detection method, apparatus, and a LiDAR are provided. The LiDAR detection method includes: obtaining ambient information of the LiDAR; determining a detection mode of the LiDAR based on the ambient information; determining a target detection region of the LiDAR based on the detection mode; determining a working parameter of the LiDAR based on the target detection region; and running, by the LiDAR, the working parameter to perform regional detection.

Abstract: The present disclosure provides a galvanometer motor, including a stator, a rotor, and a sensor board. The stator includes a housing and a drive coil mounted inside the housing. The rotor includes a rotating shaft and a galvanometer lens. A pair of radially magnetized magnetic poles are at the middle of the rotating shaft, two ends of the rotating shaft are rotatably mounted inside the housing, and one end of the rotating shaft extends outside the housing and is connected to the galvanometer lens. The sensor board is fixed on an inner wall of the housing and is at one end of the housing farther away from the galvanometer lens. The sensor board is mounted with one or more magnetic sensors configured to sense a magnetic field signal generated by the pair of magnetic poles, to obtain absolute positions of the rotating shaft and the galvanometer lens.

Abstract: The present disclosure provides a parallel decision system and method for distributed data processing. The system includes: an initial logical node generation assembly, a logical node traversal assembly, a predetermined configuration cost computation assembly, and a parallel decision assembly. The initial logical node generation assembly is configured to receive task configuration data input by a user to generate an initial logical node topology for the distributed data processing system. The logical node traversal assembly is configured to traverse the initial logical node topology to obtain a predetermined configuration in the initial logical node topology. The predetermined configuration cost computation assembly is configured to compute a transmission cost of each predetermined configuration and a cost sum.

Abstract: Embodiments of the present application disclose an optical grating disk, a method for identifying a Z-phase signal, a photoelectric encoder, and a LiDAR. At least two Z-phase etched lines are arranged on a circular disk of an optical grating disk. The method includes determining positions of a plurality of Z-phase signals collected within preset duration; identifying an abnormal Z-phase signal in the plurality of Z-phase signals based on position is of the at least two Z-phase etched lines and the positions of the Z-phase signals; and determining a position of an abnormal Z-phase etched line on the optical grating disk based on the position of the abnormal Z-phase signal when there is the abnormal Z-phase signal.

Abstract: The present disclosure provides a parallel decision system and method for distributed data processing. The system includes: an initial logical node generation assembly, a logical node traversal assembly, a predetermined configuration cost computation assembly, and a parallel decision assembly. The initial logical node generation assembly is configured to receive task configuration data input by a user to generate an initial logical node topology for the distributed data processing system. The logical node traversal assembly is configured to traverse the initial logical node topology to obtain a predetermined configuration in the initial logical node topology. The predetermined configuration cost computation assembly is configured to compute a transmission cost of each predetermined configuration and a cost sum.

Abstract: This application discloses a galvanometer and a LiDAR. The galvanometer includes a first shaft and a second shaft. A first shaft drive voltage is used to control the galvanometer to vibrate around the first shaft, a second shaft drive voltage is used to control the galvanometer to vibrate around the second shaft, and the first shaft drive voltage and the second shaft drive voltage are superimposed to drive the galvanometer. There are N working intervals in a second shaft drive period, and in the N working intervals, the second shaft drive voltage and the first shaft drive voltage jointly drive the galvanometer to form N scanning tracks. The N scanning tracks do not coincide and N is a positive integer.

Abstract: The present application discloses a method and a device for controlling a micro galvanometer of a solid-state LiDAR, and a solid-state LiDAR. The method includes acquiring a vertical angle range of a field of view scanned by the solid-state LiDAR, determining a first vertical angle of the field of view and a second vertical angle of the field of view corresponding to a preset ROI region of the solid-state LiDAR, reducing a slow axis scanning speed of the micro galvanometer to a first preset speed when it is monitored that the micro galvanometer scans the first vertical angle of the field of view, and adjusting the slow axis scanning speed of the micro galvanometer to a second preset speed when it is monitored that the micro galvanometer scans the second vertical angle of the field of view.

Abstract: A self-balancing vehicle includes two vehicle bodies, respectively including a carrier assembly, a moving mechanism, a control assembly, and a power supply device coupled to the control assembly. The carrier assembly includes a frame and a foot platform coupled to the frame to form a cavity. The frame recess towards the foot platform defining a groove. The moving mechanism includes a wheel disposed on the groove side of the frame and a driving member. Part of the wheel is accommodated in the groove. The driving member drive the wheel to rotate relative to the frame. The control assembly includes a posture sensor detecting a tilt angle of the frame with respect to the vertical direction and a controller controlling a rotation speed of the driving member. At least one of the power supply device and the controller is accommodated in the cavity.

Abstract: A self-balancing vehicle includes two vehicle bodies, respectively including a carrier assembly, a moving mechanism, a control assembly, and a power supply device coupled to the control assembly. The carrier assembly includes a frame and a foot platform coupled to the frame to form a cavity. The frame recess towards the foot platform defining a groove. The moving mechanism includes a wheel disposed on the groove side of the frame and a driving member. Part of the wheel is accommodated in the groove. The driving member drive the wheel to rotate relative to the frame. The control assembly includes a posture sensor detecting a tilt angle of the frame with respect to the vertical direction and a controller controlling a rotation speed of the driving member. At least one of the power supply device and the controller is accommodated in the cavity.

Abstract: Methods, systems, and computer-readable media are provided for updating a search index with new uniform resource locators (URLs) and spiking URLs with increased user interest. History data, provided from browser applications residing on users' computers that indicate URLs accessed by the users, is parsed to identify new/previously unknown URLs. The history data also indicates URLs in which there is increased interest based on a number of recent hits as compared to an average number of hits determined over time. Author postings of new URLs to social networking sites and a quality rating of the authors may also be used to identify and filter new URLs. Search indexes are updated with the new and spiking URL data. As such, lag time between posting of new URLs and spiking of URL interest and inclusion of this data in a search index is greatly decreased.