Abstract: A server includes at least one processor and at least one memory. The at least one memory includes computer program code. The at least one memory and the computer program code are configured, with the at least one processor, to cause the server to at least obtain task description information of a target task and status information of one or more dock apparatuses communicatively connected to the server, determine a target dock apparatus from the one or more dock apparatuses according to the task description information and the status information, and send a dispatching instruction to the target dock apparatus to instruct the target dock apparatus to select, according to the dispatching instruction, a target UAV from one or more UAVs to perform the target task. The one or more UAVs are carried by and communicatively connected to the target dock apparatus.

Abstract: Embodiments of the present disclosure provide a display panel comprising a plurality of first connecting lines and a plurality of second connecting lines which are cross-arranged, a first insulation layer, a second insulation layer defining first holes extending through the first insulation layer and the second insulation layer and second holes extending through the second insulation layer, and a plurality of third connecting lines, wherein each of the plurality of the third connecting lines is electrically connected to a corresponding one of the plurality of the first connecting lines via a corresponding one of the first hole and is electrically connected to a corresponding one of the plurality of the second connecting lines via a corresponding one of the second hole, and each of the second holes does not overlap the plurality of the first connecting lines in a top view.

Abstract: A kinematics-free hand-eye calibration method comprises: controlling translation axes of a five-axis motion platform to perform a single-axis point location motion, using a camera to obtain a first spatial coordinate of a calibration plate, fitting all first spatial coordinates into a spatial straight line to obtain a unit direction vectors of the spatial straight line, carrying out Schmidt orthogonalization on the unit direction vectors of the spatial straight lines of an X direction, a Y direction and a Z direction to obtain a pose relationship matrix combined by the orthogonalized direction vectors; obtaining a second spatial coordinate of the calibration plate in a mode of rotating an X-axis and a C-axis, fitting all second spatial coordinates into a spatial spherical surface, calculating a spherical center coordinate to obtain a position relationship matrix, and obtaining a hand-eye relationship matrix combined by the pose relationship matrix and the position relationship matrix.

Abstract: A five-axis linkage synchronous tool path interpolation method and system, which utilizes the strict proportional coefficient relationship between points, control points and parameters on the first-order derivative curve of the spline curve, more accurate tool axis path curve interpolation points from the parameters of the tool tip path curve are calculated. There is no need to calculate the tool axis path curve interpolation points according to interval synchronization. It is not affected by the shape consistency of the tool tip path curve and the tool axis path curve.

Abstract: A full slag covering, spatter-free flux-cored welding wire, relating to the technical field of welding material formulations, which includes a flux core and a metal sheath, wherein the flux core is a slag system based on a neutral slag of calcium oxide-titanium dioxide-aluminum oxide; and molten drops are prevented from flying out to form spatters under the action of liquid slag in a welding process. The flux core is composed of rutile, fluoride, titanate, aluminum powder, manganese powder, chromium powder, molybdenum powder and iron powder, and mass percentages of respective components are: 15%-35% rutile, 15%-35% fluoride, 3%-7% calcium titanate, 5%-10% aluminum powder, 10%-20% manganese powder, 3%-5% chromium powder, 3%-15% molybdenum powder, and a remainder is iron powder or nickel powder. The present welding wire solves the technical problems of weld spatter and poor stability in the traditional welding process.

Abstract: Provided are an indoor distribution system and a signal transmission method. The system includes an access unit, an extended unit, a first coupling unit, and at least one remote cascaded chain. Each remote cascaded chain includes at least one second coupling unit and at least one remote unit. The at least one second coupling unit in each remote cascaded chain is cascaded, and each remote unit is respectively connected to a corresponding second coupling unit. The first coupling unit transmits a radio-frequency signal transmitted by the extended unit to the second coupling unit. The second coupling unit transmits a radio-frequency signal of input power to the remote unit connected to the second coupling unit according to a coupling value. The remote unit adjusts the power of the radio-frequency signal from the input power to the output target power and output the adjusted radio-frequency signal.

Abstract: The present invention relates to a carbide tool cleaning and coating production line and a method, including a cleaning device including a support frame, a cleaning mechanism and a drying mechanism are sequentially disposed under the support frame connected to a moving mechanism, the moving mechanism is connected to a lifting mechanism being capable of being connected to a tool fixture bracket being configured to accommodate the tool fixture; a coating device including a coating chamber which a plane target mechanism and a turntable assembly disposed in, the turntable assembly is capable of being connected to a plurality of tool fixtures being capable of rotating around an axial line of the coating chamber under the driving of the turntable assembly and rotating around an axial line thereof at the same time; and, a manipulator being disposed between the cleaning device and the coating device.

Abstract: An antenna device includes a plurality of dipole antennas and a port. Each of the dipole antennas is connected to the port. The dipole antennas are arranged around the port. Each of the dipole antennas comprises two ends. The device further includes a plurality of passive elements. The ends of the dipole antennas and the passive elements are interchangeably arranged around the port such that each of the passive elements is situated between ends of two different antennas from the plurality of dipole antennas. One or more switches are configured to switch between an omnidirectional state, in which the ends of the dipole antennas are not connected to the plurality of passive elements, and a directional state, in which at least one end of one of the passive elements is connected to at least one end of one of the antennas.

Abstract: The disclosure discloses an ultrasonic-assisted pretreatment method for extraction of multiple steroid hormones in a sediment, including the following steps: (1) lyophilizing the sediment, grinding the sediment, and passing the ground sediment through a 40-60-mesh sieve; (2) placing the sample obtained in step (1) in a container; (3) adding an extractant to the container in step (2), shaking the mixture for 15 s-30 s, centrifuging the mixture to collect an supernatant after ultrasonication, and repeating extraction three times; where the extractants used in the three times of extraction are two of methanol, acetonitrile and acetone; and (4) after mixing the supernatants of the three times of extraction obtained in step (3), concentrating the mixture under a nitrogen flow at 20-30° C., passing the concentrated mixture through a filter, and performing detection. By using the method of the disclosure, the maximum recovery can be up to 100%.

Abstract: A calculation system for predicting a proppant embedding depth based on a shale softening effect is provided, including a sampling test terminal, a scheduling module, a monitoring module, and a calculation module, wherein the scheduling module, the monitoring module, and the calculation module are connected in communication, and the monitoring module is connected to an external operating system through a wireless network, wherein the external operating system is configured to perform a hydraulic fracturing operation and receive a first control signal and/or a second control signal from the monitoring module. The sampling test terminal is configured to test the samples and obtain test data. The scheduling module is configured to determine a target construction parameter.

Abstract: A (methyl)acrolein oxidation catalyst and a preparation method therefor-in which the catalyst has a composition represented by the following formula: x(Mo12PaCsbVcDeOf)+tC/yZ in which Mo12PaCSbVcDeOf is a heteropolyacid salt main catalyst; C is a nano carbon fiber additive, and Z is a carrier thermal conduction diluent; Mo, P, Cs, V, and O represent the elements of molybdenum, phosphorus, cesium, vanadium, and oxygen, respectively; D represents at least one element selected from the group consisting of copper, iron, magnesium, manganese, antimony, zinc, tungsten, silicon, nickel, and palladium; a, b, c, e, and f represent the atomic ratio of each element, a=0.1-3, b=0.01-3, c=0.01-5, e=0.01-2, and f being the atomic ratio of oxygen required to satisfy the valence of each of the described components; x and y represent the weights of the main catalyst and the carrier thermal conduction diluent Z, and y/x=11.1-50%; and t represents the weight of the nano carbon fiber, and t/x=3-10%.

Abstract: The present disclosure provides a method for experimentally determining a critical sand-carrying gas velocity of a shale gas well. The method includes: collecting well structure and production data, calculating parameter ranges of a gas flow velocity and a liquid flow velocity; carrying out a physical simulation experiment of sand carrying in the shale gas well to obtain the sand holding capacity of the wellbore under different experimental conditions, and calculating a sand holding rate; by observing a change curve of the sand holding rate of the wellbore vs. the gas flow velocity, defining a turning point, and sensitively analyzing the influence of other experimental variables on the turning point, to calculate the critical sand-carrying production of the shale gas well under different conditions. Therefore, this calculation method is simple and applicable, and provides a theoretical basis for the optimization design of water drainage and gas production process.

Abstract: Provided is a method for interplanting grape and Polygonatum kingianum in a photovoltaic (PV) power plant. The method includes: building a grapevine traction frame which is higher in south and lower in north in a space formed by a plurality of PV modules in the PV power plant, the grapevine traction frame includes a plurality of uprights, a plurality of traction crossbars, a plurality of supporting bars and a wire mesh; making a grape ridge below the south of each PV module and planting grape seedlings; maintaining two branches for each of the grape seedlings in the same year of grape planting, and pulling the two branches along the traction crossbar located in south; pulling branches grown out of arm bud points southwards onto the wire mesh in the next year of grape planting; sowing and ploughing a green manure, making planting beds in a shade and planting Polygonatum kingianum.

Abstract: A refrigerant distributor (4) includes: a box body (42); a refrigerant inlet (41) arranged on an upper surface (421) of the box body (42); liquid exit openings (46) evenly arranged on a lower surface (422) of the box body (42); and end plates arranged at both ends of the box body (42) in a length direction and enclosing the box body (42) from the two ends; wherein, in a height direction from the lower surface (422) of the box body (42) to the upper surface (421) and within a predetermined height range starting from the lower surface (422), a width of the box body (42) increases gradually; and a pre-distributor (3) is arranged inside the box body (42).

Abstract: A dimensionless kinematics calibration method based on a virtual point and a related apparatus thereof. The method comprises: establishing a kinematics model of a motion mechanism, and arranging a plurality of virtual points at a tail end of the motion mechanism to establish a dimensionless kinematics model and a dimensionless error model; converting a measurement coordinate system into a motion mechanism coordinate system, acquiring a rotation matrix and a translation matrix of a target virtual point measured by the measurement device, and calculating actual coordinates of all virtual points to obtain a measured value of the dimensionless kinematics model; calculating a theoretical value of the dimensionless kinematics model according to a spatial relationship between a reflecting head and the tail end of the motion mechanism; and optimizing the dimensionless error model according to the measured value and the theoretical value to obtain a calibration result.

Abstract: A multi-procedure integrated automatic production line for hard alloy blades under robot control is provided. The production line includes a rail-guided robot. A cutter passivation device and a blade cleaning and drying device are arranged on one side of the rail-guided robot. A blade-coating transfer table, a blade coating device, a blade boxing transfer table, a blade-tooling dismounting device and a blade boxing device are sequentially arranged on another side of the rail-guided robot. The blade-tooling dismounting device is arranged on one side of the blade boxing transfer table. The production line further includes squirrel-cage toolings for carrying the blades. The squirrel-cage tooling that are loaded with the blades can run among the cutter passivation device, the blade cleaning and drying device, the blade-coating transfer table and the blade boxing transfer table. The blades after being treated through the blade-tooling dismounting device are sent to the blade boxing device.

Abstract: A disparity image fusion method for multiband stereo cameras belongs to the field of image processing and computer vision. The method obtains pixel disparity confidence information by using the intermediate output of binocular disparity estimation. The confidence information can be used to judge the disparity credibility of the position and assist disparity fusion. The confidence acquisition process makes full use of the intermediate output of calculation, and can be conveniently embedded into the traditional disparity estimation process, with high calculation efficiency and simple and easy operation. In the disparity image fusion method for multiband stereo cameras proposed by the method, the disparity diagrams participating in the fusion are obtained according to the binocular images of the corresponding bands, which makes full use of the information of each band and simultaneously avoiding introducing uncertainty and errors.

Abstract: Disclosed is an eddy current flaw detection system based on a NV (nitrogen-vacancy) color center quantum sensing technology, relating to the technical field of quantum sensing. The system includes a laser transceiver processing unit, a quantum sensor, an excitation coil, a power supply unit, a microwave coil, and a microwave unit. The diamond NV color center precision measurement technology and the eddy current nondestructive flaw detection technology are combined in accordance with the present disclosure. Compared with the traditional technology, the remarkable performance of the diamond NV color center can improve the accuracy of eddy current nondestructive flaw detection and achieve the accurate detection of fine crack defects. Meanwhile, a detection method for an alternating current magnetic field is designed according to the characteristics of the eddy current nondestructive flaw detection.

Abstract: The present disclosure provides a method for acquiring a network topology and an indoor distribution system. The method comprises: a host unit receives position information transmitted by each extended unit connected to the host unit, and determines a network topology structure according to the position information. In this way, the labor cost can be reduced. In addition, the network topology structure obtained by the method provided by the present disclosure has higher accuracy, so that position information of each node can be learnt at a host unit, the fault can be quickly located, and the system operation and maintenance cost is reduced.

Abstract: Computer-implemented systems and methods for livestream engagement enhancement are disclosed and may be configured to retrieve a first set of texts; retrieve a second set of texts; transmit a plurality of texts including at least the first and second set of texts for display on one or more user interfaces associated with one or more user devices; receive user interaction data from at least one of the one or more user devices, wherein the user interaction data includes indication of user interaction by one or more users with at least one or more texts of the plurality of texts via at least one of the one or more user interfaces; and transmit each text of the one or more texts to a second user device for display on at least one of a first page or a second page of a second user interface.