Abstract: This application discloses a parametric design method of a roller tooth profile of a work roll for roll forming of a flow channel of a metal bipolar plate. The method includes: (1) an engagement transmission drawing is plotted according to depth h of the flow channel and a rolling period angle, where h=r1-r6. A first-half surface of a tooth consists of six segments, where the top surface segment, the upper half segment of the tooth side, the root segment, and the transition segments for the top corner and the root corner are arc curves, and the lower half segment of the tooth side is a straight line. (2) With the center O1 of the upper roller as the origin, a transverse end coordinate system is established, and the six segments of the left-half tooth are designed regarding parameters.

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 charging station capable of guiding a self-driving device to interface includes a base plate installed in a working area to fix the self-driving device; a first wire surrounding on the base plate and connected to a signal generator independently of a boundary; a second wire surrounding on the base plate and connected to the signal generator independently of the boundary and the first wire; and the signal generator sending a guide signal to the first wire and/or the second wire; where multiple areas surrounded by the first wire and the second wire include at least a first area having a first magnetic field signal, a second area having a second magnetic field signal, and a third area having a third magnetic field signal.

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: A terminal device receives a first BWP hopping pattern from a network device. The first BWP hopping pattern includes one or more pieces of configuration information for switching between a first BWP and a second BWP. The terminal device switches between the first BWP and the second BWP based on the first BWP hopping pattern. The switching between the first BWP and the second BWP includes switching from the first BWP to the second BWP and switching from the second BWP to the first BWP.

Abstract: A battery pack and a state of charge (SOC) estimation method of the battery pack are provided. The method includes estimating an SOC of the battery pack based on a real-time current flowing through the battery pack, where the real-time current is estimated according to real-time parameters of the battery pack, at least part of the real-time parameters of the battery pack are capable of being acquired by querying a battery pack database with at least partially data preset. With the preceding technical solution, a battery pack can be provided which has a low cost and can accurately estimate the SOC of the battery pack without a current detection resistor.

Abstract: A polypeptide having epoxy group-removing catalytic activity with an amino acid sequence as set forth in SEQ ID NOs: 1-35, a nucleic acid molecule encoding the polypeptide, a nucleic acid construct comprising the nucleic acid, a pharmaceutical composition for detoxification and a food, beverage or feed composition comprising the polypeptide, and a host cell and an engineered microorganism into which the nucleic acid is introduced. Disclosed are a method for producing the polypeptide; and a method for catalyzing a reaction of removing an epoxy group of a trichothecene, a method for preventing cell poisoning or relieving cytotoxicity, a method for processing a food and beverage or feed composition, and a method for reducing or decreasing a toxin in a composition, all using the polypeptide. Further disclosed are a glutathionylated derivative, a method for evaluating the detoxification effect for a sample contaminated with a trichothecene using the glutathionylated derivative.

Abstract: Embodiments of this application provide a resource configuration method and apparatus, and relate to the field of communication technologies, to resolve a problem that demodulation performance of a terminal device in a long term evolution (LTE) cell deteriorates when resources for the LTE cell avoid resources for a new radio (NR) cell. A solution for resolving this problem may include obtaining, by an access network device, first configuration information. The first configuration information includes a bandwidth range of a NR cell, and the bandwidth range of the NR cell includes a dedicated frequency domain resource of the NR cell and a frequency domain resource shared by the NR cell and a LTE cell. The solution further includes sending, by the access network device, the first configuration information to a terminal device in the NR cell.

Abstract: This application provides a communication method and apparatus. The method may include: A cell in a first frequency range determines to enter an energy saving state. A terminal device accesses a cell in a second frequency range through cell selection. When the terminal device needs to enter the cell in the first frequency range, the cell in the second frequency range assists the terminal device in accessing the cell in the first frequency range. In this application, energy saving can be implemented through assistance between a plurality of cells. For example, the cell in the first frequency range may enter the energy saving state. Communication performance can be ensured. For example, the cell in the second frequency range may assist the terminal device in accessing the cell in the first frequency range in the energy saving state.

Abstract: The present disclosure provides a transistor device, a manufacturing method thereof, a display substrate and a display device. The transistor device includes a base substrate, as well as a first transistor and a second transistor that are disposed on the base substrate. The first transistor includes a first active layer. The second transistor includes a second gate. The first active layer and the second gate are disposed in the same layer.

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: A compact silicon waveguide mode converter, a dielectric meta-surface structure based on periodical oblique subwavelength perturbations, including a top silicon structure with oblique subwavelength perturbations etched in certain periods with period length of ?, a duty cycle and an oblique angle ? on the SOI substrate. The invention adopts an all-dielectric meta-surface structure with oblique subwavelength perturbation, which can achieve a compact mode conversion from fundamental mode to arbitrary high-order mode of silicon waveguide, and can improve the optical communication capacity greatly.

Abstract: Disclosed are a nucleic acid molecule, a polypeptide having epoxy group-removing catalytic activity and use thereof. According to the invention, by means of genetic engineering, the nucleic acid molecule encoding a de-epoxidation protein is expressed in a plant, so that an epoxy group of a trichothecene mycotoxin is removed, and the toxin amount in the plant is reduced. The polypeptide of the invention is capable of catalyzing a reaction between vomitoxin and glutathione under mild conditions to remove epoxy groups to produce a glutathionylated derivative.

Abstract: A power tool includes a brushless motor including several windings, a drive circuit for driving the brushless motor, a detection device for detecting the brushless motor so as to obtain a load parameter corresponding to a load of the brushless motor, and a controller for outputting a first control signal to reduce current of the brushless motor in a first slope when the load parameter exceeds a first preset range.

Abstract: A smart mowing system includes a boundary line, a signal transmitting unit, and a smart mower. The boundary line is configured to plan a working area. The signal transmitting unit is configured to generate a boundary signal to the boundary line. The smart mower includes a first signal receiving module, a second signal receiving module, and a control module. The second signal receiving module is a preset distance away from the first signal receiving module. The control module is configured to determine whether the first signal receiving module is located inside the boundary line, to determine whether the second signal receiving module is located inside the boundary line, and to control the smart mower to walk along the boundary line when the first signal receiving module or the second signal receiving module is located outside the boundary line.

Abstract: A power tool includes a brushless motor including several windings, a drive circuit for driving the brushless motor, a detection device for detecting the brushless motor so as to obtain a load parameter corresponding to a load of the brushless motor, and a controller for outputting a first control signal to reduce current of the brushless motor in a first slope when the load parameter exceeds a first preset range.