Abstract: A direct-drive wind farm parameter tuning method and system considering the interaction between generators are provided. The method includes: collecting initial oscillation current of each direct-drive wind turbine port in the direct-drive wind farm; according to collected data, taking period of dominant oscillation mode as the iteration period to calculate the overall farm-grid interaction dynamic energy and parameter tuning index of the direct-drive wind farm in current iteration period; obtaining stability level of the direct-drive wind farm based on the overall farm-grid interaction dynamic energy in the current iteration period; when the system is unstable, the optimization model of key control parameters is established with the minimum value of the parameter tuning index in the current iteration period as the objective function and the range of each key control parameters as the constraint condition to achieve the key control parameters tuning of the direct-drive wind farm.

Abstract: A parking space management method by a communication apparatus comprises transmitting, a radio signal beamformed in a specific direction, determining that a parking space associated with the specific direction is in a state of being vacant when the communication apparatus receives a response signal in response to the radio signal, and determining that the parking space is in a state of being occupied by a vehicle parked therein when the communication apparatus does not receive the response signal.

Abstract: Methods and systems of determining sampling triggers for an analysis device, the methods and systems including obtaining a frequency of sampling triggers, a cycle time to acquire a single data point, a number of data points to be acquired for a single peak, and a baseline signal width of a single sampling trigger peak, determining a desired number of sampling triggers to be performed and a delay time between sampling events based on the frequency of sampling triggers, the cycle time, the number of data points to be acquired for the single peak, and the baseline signal width of the single sampling trigger peak, and performing a measurement of a sample by executing the determined desired number of sampling triggers from the sample.

Abstract: A method for optimizing a topology of a mesh network. The method comprises determining a topology of a mesh network and a first access point (AP) to be added to the mesh network. The method further comprises determining a multi-uplink group between the first AP and the second AP. The method further comprises determining a first number of sibling APs of the first AP and a second number of neighbor APs of the first AP by determining the second AP as a parent AP of the first AP. The method further comprises determining a metric value for the multi-uplink group based on the first number of sibling APs and the second number of neighbor APs of the first AP. The method further comprises adding, based on determining that the metric value meets a predetermined condition, the first AP into the mesh network according to the multi-uplink group.

Abstract: A phosphate ester salt has a bicyclic organic base structure as a cation and a phosphate ester structure as an anion. The phosphate ester salt can effectively improve the wear-resistance performance and load-carrying capacity of the lubricating oil at a relatively small dosage, and the lubricating oil shows excellent copper corrosion resistance. Also described are a process for preparing the phosphate ester salt, a lubricating oil and lubricating grease containing the phosphate ester salt, and use of the phosphate ester salt.

Abstract: A method for detecting an acid-etching speed of core glass includes obtaining an initial end-face image and an acid-etched end-face image sequence corresponding to a sample microchannel plate blank, selecting a plurality of target microholes in the initial end-face image and intercepting a microhole acid-etching image sequence corresponding to each target microhole from the plurality of acid-etched end-face images according to position coordinates of each target microhole; determining a plurality of total optical flow motion fields corresponding to each target microhole based on a preset optical flow algorithm and the plurality of microhole acid-etching images corresponding to each target microhole, determining a maximum motion speed value among the plurality of total optical flow motion fields as a target motion speed value corresponding to the sample microchannel plate blank, and determining an acid-etching speed of core glass corresponding to the sample microchannel plate blank.

Abstract: A method for detecting an acid etching speed of core glass includes obtaining an initial end face image and an acid-etched end face image sequence corresponding to a sample microchannel plate blank; selecting a plurality of target microholes in the initial end face image, and intercepting a microhole acid-etching image sequence corresponding to each of the target microholes; determining a plurality of in-plane velocity fields corresponding to each of the target microholes based on a preset digital speckle correlation algorithm and the plurality of microhole acid-etching images corresponding to each of the target microholes; determining a maximum velocity value in the plurality of in-plane velocity fields as a target velocity value corresponding to the sample microchannel plate blank; and determining the acid-etching speed of core glass corresponding to the sample microchannel plate blank.

Abstract: A communication method to be executed by a first access point included in a plurality of access points in a communication system in which a user device is configured to perform communication with the plurality of access points, includes transmitting a first control signal for controlling communication with the user device in a first frequency band, performing data communication with the user device in the first frequency band, and transmitting, in the second frequency band during the data communication with the user device, a second control signal which is a signal requesting one or more other access points to stop transmission of the first control signal. The user device is a moving user device.

Abstract: A method and system for tracking the oscillation path of a direct drive wind farm involve: collecting the port current, the current and state variables of the current inner loop, the dynamic angle and state component of the phase-locked loop and the phase and amplitude of the fault point voltage of each wind turbine generator in a dominant oscillation mode period which is used as acquisition period, and then obtaining corresponding instantaneous value of each oscillation component of the direct drive wind turbine generator; obtaining energy flow of coupling energy transfer path of direct drive wind farm in each acquisition period based on the instantaneous value; tracking the key energy transfer path of the direct drive wind farm according to the energy flow, so as to realize the stability control of the direct drive wind farm.

Abstract: A wireless communication apparatus for transmitting data to a plurality of terminals in conformity with a predetermined wireless communication standard, comprises a controller configured to execute: successively broadcast-transmitting a plurality of data blocks; broadcast-transmitting first notification data as a notification for causing a first terminal receiving at least a part of the plurality of data blocks to declare that there is an unsuccessfully received data block after completion of the transmission of the plurality of data blocks; and retransmitting, if second notification data indicating the unsuccessfully received data block is received as a response to the first notification data from one or more of the first terminal, the data block indicated by the second notification data.

Abstract: A method includes obtaining a first set of coordinates of the at least three points in a robot coordinate system and a second set of coordinates of the at least three points in a touch screen coordinate system; causing the conveyor to move from the first position to a second position different from the first position; obtaining a third set of coordinates of the at least further three points in the robot coordinate system and a fourth set of coordinates of the at least three further points in the touch screen coordinate system; and determining a conveyor coordinate of the conveyor in the robot coordinate system based on the first set of coordinates, the second set of coordinates, the third set of coordinates and the fourth set of coordinates.

Abstract: A method of evaluating an operation of a downhole motor implemented in a wellbore includes receiving a first set of downhole data associated with the operation of the downhole motor at a first flowrate and generating a flowrate-independent power curve for the downhole motor based on the first set of downhole data. The method further includes, based on the flowrate-independent power curve, determining a second set of downhole data associated with the operation of the motor at a second flowrate.

Abstract: The application relates to a method and system for a pilot directional protection of LCC-HVDC lines based on virtual grounding resistance. The method comprises: Obtaining a conduction state information of a converter and characteristic parameters of a converter circuit within one commutation period after a fault occurs; according to the conduction state information and characteristic parameters, determining characteristic frequency of the circuit; according to the characteristic frequency and characteristic parameters, determining a virtual grounding resistance; according to the virtual grounding resistance, determining fault areas.

Abstract: A monocular high-speed videogrammetry method based on a dynamic platform includes the following steps: collecting a monocular high-frame-rate image sequence of the dynamic platform and performing preprocessing; conducting dynamic image-block data processing on the image sequence based on adaptive brightness compensation and least-squares fitting (LSF) to obtain adjusted images; performing camera-pose calibration on the adjusted images based on sliding-window constraints to obtain calibrated images; and acquiring three-dimensional (3D) coordinates and estimated displacements of tracking points from the calibrated images, and outputting measurement results based on the 3D coordinates and the estimated displacements. Through optimization of the measurement process, the method supports real-time adaptive compensation, dynamic image-block processing, and camera-pose calibration, thereby providing significant application value.

Abstract: Embodiments of the present disclosure provide method and apparatus for EIRP-constrained communication. A method performed by a network device includes determining a first power back-off value for a transmission of a signal based on an effective isotropic radiated power (EIRP) limit. The method further includes determining a second power back-off value for a transmission of a channel based on the EIRP limit. The method further includes transmitting the signal to a terminal device based on the first power back-off value. The method further includes receiving a channel state information report from the terminal device. The method further includes estimating a channel quality of the transmission of the channel based on the channel state information report, the first power back-off value and the second power back-off value.

Abstract: A virus vector comprises a constitutive promoter, a nucleic acid sequence encoding a chimeric antigen receptor (CAR), an inducible promoter comprising N nuclear factor of activated T-cells (NFAT) binding motifs followed by the minimal human interleukin 2 (IL-2) promoter, and a nucleic acid sequence encoding a Helicobacter pylori neutrophil activating protein (HP-NAP) and/or an immunological equivalent fragment thereof. The virus vector may be provided in a T-cell useful in T-cell immunotherapy. The T-cells have improved effects in immunotherapy including treating, reducing and/or preventing cancer in a patient.

Abstract: A tantalum-tungsten alloy product and a preparation method therefor where the method comprises: (1) providing spherical tantalum-tungsten alloy powder, wherein the powder is characterized in that the lower limit of the particle size is 15 ?m-25 ?m, the upper limit of the particle size is 50 ?m-60 ?m, the time for 50 g of the powder to pass through a standard funnel is 5-10 seconds, the sphericity of the powder is greater than or equal to 0.8, the hollow particle ratio of the powder is less than or equal to 5%, and the apparent density is 9-11 g/cm3; (2) processing and molding the powder by using a 3D printing process to obtain a printed blank; (3) performing printing post-treatment on the blank; and (4) performing vacuum heat treatment on a product from step (3), wherein the temperature of the heat treatment is 1350° C. to 1750° C., and the time is 30-90 minutes.