Abstract: A method for forming a flow channel on a metal bipolar plate of a fuel cell includes: pre-treating a metal polar plate; subjecting the metal polar plate to low-temperature heating; forming a flow channel on the metal polar plate by rolling; cutting an inlet and outlet for gas and cooling liquid on the metal polar plate; performing surface treatment on the metal polar plate; bonding two metal polar plates to form a metal bipolar plate; and trimming the metal bipolar plate. The flow channel is formed by two pre-forming and one truing, and design parameters of punches and dies of the rollers used are determined by calculation models.

Abstract: Embodiments of the present disclosure provide a method and a device for cooperative control of multiple trains. The method includes: S1, establishing a train dynamic model of urban rail transit; S2, modeling a train control system of urban rail transit based on train-to-train communication; S3, constructing, according to the dynamic model and a control system model, an optimized control target which comprehensively considers distance convergence and speed convergence of train formation; and S4, cooperatively controlling, on the basis of an artificial potential field method and Kalman filtering and according to the optimized control target, the multiple trains. The present disclosure is capable of effectively shortening a train headway.

Abstract: A controller of a power tool is configured to, based on a sampled current of a motor of the power tool, output control signals that change with a change of a position of a rotor of the motor to control a drive circuit of the power tool such that an input voltage and/or a current of the motor changes approximately in a sine wave.

Abstract: A product identification method comprises instructing an antenna in a product verification area to collect first product identification data of identified products in the case where a user enters the product verification area of a product identification passage; instructing the antenna in the product verification area to collect product verification data of identified products in the case where a user enters a product settlement area of the product identification passage; and determining user product data based on the first product identification data and the product verification data. A product verification area is provided to eliminate a tag outside the passage being falsely read and reduce a tag false reading probability.

Abstract: A power tool, includes a power supply module for connecting to AC power; a brushless motor including a rotor and a stator winding; a rectifier module configured to receive the AC power from the power supply module and output a DC bus voltage; a position detection module for detecting a position signal of the brushless motor; a MCU chip configured to receive the position signal of the brushless motor detected by the position detection module and output a driving signal according to the position signal, where the MCU chip includes a controller; and a driving circuit configured to receive the driving signal from the MCU chip to drive the brushless motor, where the driving circuit is connected in series between the MCU chip and the stator winding of the brushless motor.

Abstract: A power tool includes a motor, a power supply device, a driver circuit, a parameter acquisition module, and a controller. The motor includes a stator and a rotor. The motor is configured to generate a reluctance torque. The driver circuit is electrically connected to the motor to drive the motor. The parameter acquisition module is configured to acquire a current of the motor, a rotational speed of the motor, and a position of the rotor. The controller is configured to: according to at least one of the current of the motor, the rotational speed of the motor, or the position of the rotor, dynamically adjust a current applied to the stator so that an included angle between a stator flux linkage of the motor and a rotor flux linkage of the motor ranges from 90° to 135°.

Abstract: A power tool includes an output shaft, a motor, a housing, a detection unit, a storage device and a control unit. The output shaft is configured to output a torsion. The motor is configured to drive the output shaft to rotate. The housing is configured to accommodate the motor. The detection unit is configured to detect an operational parameter of the power tool. The storage device is configured to store at least a first threshold corresponding to a first operating condition set and a second threshold corresponding to a second operating condition set. The control unit is communicatively connected to the detection unit and the storage device.

Abstract: A power tool has a functional component, a motor, a power supply module, a controller and a drive circuit including a first drive terminal and a second drive terminal respectively electrically connected to a first power terminal and a second power terminal of the power supply module, multiple high-side switches wherein high-side terminals of the high-side switches are respectively electrically connected to the first drive terminal, and multiple low-side switches wherein low-side terminals of the low-side switches are respectively electrically connected to the second drive terminal. The controller is configured to output a first control signal to one high-side switch to place it in an on or off state and output a second control signal to one low-side switch to place it in the other state. The low-side terminal of one high-side switch is connected to the high-side terminal of one low-side switch.

Abstract: An intelligent lawn mower includes a cutting blade for cutting grass, a deck for supporting the cutting blade, at least one wheel rotatably supporting the deck, a first drive motor to provide torque to the at least one wheel, a mowing path generation module to set multiple target positions on a first virtual boundary and a second virtual boundary of a mowable area boundary according to a preset path and generate a mowing path from the target positions, and a controller electrically connected to or communicated with a display interface and the mowing path generation module to control the intelligent lawn mower to perform mowing tasks along the mowing path generated by the mowing path generation module.

Abstract: A face recognition method includes: detecting keypoints when receiving a first face image; acquiring a recognition score of each detectable keypoint and serial numbers of missing keypoints; acquiring a plurality of target keypoints in the plurality of detectable keypoints having a predetermined face feature association relationship with the missing keypoints when the influence score is higher than a predetermined score threshold; acquiring a target face feature template having a degree of position combination with the plurality of target keypoints greater than a predetermined combination degree threshold; and stitching the target face feature template and the plurality of target keypoints on the first face image to obtain a second face image so as to detect all the keypoints according to the second face image for performing the face recognition.

Abstract: Disclosed is a chain saw and a power tool, including a working part, a body, a brushless motor, a power supply device, a drive circuit, a controller, and a motion detection device. The motion detection device is coupled to the body or the working part for detecting a motion of the body or the working part in at least one direction. The controller is configured to control the drive circuit to make the brushless motor enter a braking mode when the amount of the motion of the body or the working part in at least one direction exceeds a predetermined threshold.

Abstract: The present invention provides a degradable microbead comprising a polymer molecule crosslinked by a crosslinking agent, wherein the polymer molecule and/or the crosslinking agent comprises a sensitive chemical bond that is cleavable through a chemical and/or light treatment, thereby resulting in the degradation of the degradable microbead. The present invention also provides a method of separating a target protein from a sample. By using the degradation of the degradable microbead to replace an elution step in protein purification, it is possible to select a combination of target protein and affinity ligand with a stronger affinity, thereby improving the protein purification efficiency. The method is especially suitable for the high-throughput preparation of multiple protein samples, for example providing a protein sample for electron microscope observation or mass spectrometry measurement.

Abstract: An electric tool includes a motor, a drive circuit, a power supply and a controller. The motor includes a rotor and first, second, and third phase windings. The drive circuit is electrically connected to the first, second, and third phase windings and drives the motor to output power. The power supply is electrically connected to the drive circuit and supplies power to the first, second, and third phase windings through the drive circuit. The controller is connected to the drive circuit and outputs a control signal to control the drive circuit. The controller controls the drive circuit according to a rotation position of the rotor when a voltage of the power supply is less than or equal to a preset voltage threshold so that the first, second, and third phase windings are simultaneously connected to the power supply.

Abstract: An intelligent mowing system includes a base station to receive at least one kind of satellite positioning signal sent by a satellite system at a fixed location and an intelligent lawn mower. A mobile station group is mounted on the intelligent lawn mower and communicated with the base station to receive at least one kind of satellite positioning signal sent by the satellite system during a walking process of the intelligent lawn mower. The mobile station group includes at least a first mobile station and a second mobile station arranged at intervals that determines the position of the intelligent lawn mower. A controller is configured to control the intelligent lawn mower to generally walk within a predetermined line width.

Abstract: A power tool has a functional component, a motor, a power supply module, a controller and a drive circuit including a first drive terminal and a second drive terminal respectively electrically connected to a first power terminal and a second power terminal of the power supply module, multiple high-side switches wherein high-side terminals of the high-side switches are respectively electrically connected to the first drive terminal, and multiple low-side switches wherein low-side terminals of the low-side switches are respectively electrically connected to the second drive terminal. The controller is configured to output a first control signal to one high-side switch to place it in an on or off state and output a second control signal to one low-side switch to place it in the other state. The low-side terminal of one high-side switch is connected to the high-side terminal of one low-side switch.

Abstract: The present disclosure discloses an atmospheric-pressure plasma equipment for fabric functional finishing and its application, and belongs to the field of textile printing and dyeing engineering. The atmospheric-pressure plasma equipment, including a discharging system, a grafting instrument and a cloth guider, can conduct continuous plasma treatment on fabrics under an atmospheric pressure, including plasma etching and plasma grafting, which breaks through the disadvantage of batch processing of vacuum plasma equipment. The equipment and method of the present disclosure realize functional finishing of the fabrics in the absence of water, and this finishing process is cost efficient, environmentally friendly, uniform, shorter treatment time and higher reactivity, and applicable to many materials and can keep the bulk properties of the treated substances.

Abstract: Disclosed is a method for preparing a precursor of a recombinant human insulin or an analogue thereof, comprising: a. bacterial fermentation, centrifuging a fermentation broth in a continuous flow to collect a supernatant; b. filtering the supernatant in step (a) by means of a hollow fiber membrane and collecting the filtrate; and c. purifying the filtrate in the step (b) by means of a chromatography column. The method has the advantages of streamlined steps, scalability, no use of organic solvents, high yield, etc. The purity of the insulin precursor can exceed 90%, the host cell protein removal rate exceeds 90%, and the exogenous DNA removal rate is 89% or greater, achieving less than 0.1 ng/mg.

Abstract: A self-propelled device system includes a self-propelled device, a boundary wire configured to define a work area of the self-propelled device and a signal transmitting unit electrically connected with the boundary wire configured to generate and send a boundary signal to the boundary wire that generates a magnetic field when flowing through the boundary wire. The self-propelled device has a signal receiving module and a control module. The signal receiving module uses the magnetic field caused by the boundary signal to generate a boundary wire inductive signal and the control module determines that the boundary wire has a wire break when a relevant parameter of the boundary wire inductive signal is less than or equal to a predefined threshold.

Abstract: An electric tool includes a motor, a drive circuit, a power supply and a controller. The motor includes a rotor and first, second, and third phase windings. The drive circuit is electrically connected to the first, second, and third phase windings and drives the motor to output power. The power supply is electrically connected to the drive circuit and supplies power to the first, second, and third phase windings through the drive circuit. The controller is connected to the drive circuit and outputs a control signal to control the drive circuit. The controller controls the drive circuit according to a rotation position of the rotor when a voltage of the power supply is less than or equal to a preset voltage threshold so that the first, second, and third phase windings are simultaneously connected to the power supply.