Abstract: Disclosed are a system and method for rapidly collecting greenhouse gas from farmland in batches, relating to the technical field of greenhouse gas collection. The system for rapidly collecting greenhouse gas from farmland in batches includes a static chamber, a static chamber placement device, a gas collection device, and a control device. The static chamber is arranged inside the static chamber placement device, and each static chamber is sleeved outside crops. The gas collection device is arranged in the static chamber placement device. The static chamber, the static chamber placement device and the gas collection device are all in wireless connection with the control device.

Abstract: A micro-robot magnetic drive device and a control method based on double closed loop three-dimensional path tracking are disclosed. The method includes: inputting a desired tracking path, obtaining current pose information of a magnetic micro-robot through a camera, and then calculating a position of a center of mass, an actual axial direction, coordinates of a desired position point with the shortest distance from the center of mass on a desired tracking path, and a tangent direction of this point; calculating a horizontal distance, a vertical distance, a direction angle error, and a pitch angle error of the two points according to the actual axial direction, the tangent direction, and disturbance compensation; and obtaining a required rotating magnetic field according to a designed position closed loop controller.

Abstract: Provided is a method for unlocking by use of a knob. The method is applied to an electronic device provided with an operation knob. The method includes the following steps: detecting (1) an action of the operation knob in a screen locked state in real time; and starting (2) an unlocking program in response to rotation of the operation knob: calculating the rotational circumferential distance of the operation knob along the current rotational direction, determining whether the rotational circumferential distance of the operation knob reaches a preset circumferential distance, controlling the electronic device to unlock in response to the rotational circumferential distance of the operation knob reaching the preset circumferential distance, and unlocking failed and returning to step (1) in response to the rotational circumferential distance of the operation knob not reaching the preset circumferential distance.

Abstract: Provided is a method for unlocking by use of a knob. The method is applied to an electronic device provided with an operation knob. The method includes the following steps: detecting (1) an action of the operation knob in a screen locked state in real time; and starting (2) an unlocking program in response to rotation of the operation knob: calculating the rotational circumferential distance of the operation knob along the current rotational direction, determining whether the rotational circumferential distance of the operation knob reaches a preset circumferential distance, controlling the electronic device to unlock in response to the rotational circumferential distance of the operation knob reaching the preset circumferential distance, and unlocking failed and returning to step (1) in response to the rotational circumferential distance of the operation knob not reaching the preset circumferential distance.

Abstract: A micro-robot magnetic drive device and a control method based on double closed loop three-dimensional path tracking are disclosed. The method includes: inputting a desired tracking path, obtaining current pose information of a magnetic micro-robot through a camera, and then calculating a position of a center of mass, an actual axial direction, coordinates of a desired position point with the shortest distance from the center of mass on a desired tracking path, and a tangent direction of this point; calculating a horizontal distance, a vertical distance, a direction angle error, and a pitch angle error of the two points according to the actual axial direction, the tangent direction, and disturbance compensation; and obtaining a required rotating magnetic field according to a designed position closed loop controller.

Abstract: The disclosure discloses a tissue-engineered nerve transplant and a preparation method thereof, and belongs to the technical fields of biomaterials and tissue engineering. By optimizing the specification of stripes, the stripes can independently induce EMSCs to differentiate to myelination cells (Schwann cells) to the maximum extent so as to obtain an EMSCs/biomaterial scaffold compound. The EMSCs/biomaterial scaffold compound can not only be used as a three-dimensional cell culture model for researching neural stem cell differentiation, nerve fiber growth and myelination molecular mechanisms in vitro, but also be used as a tissue engineering transplant for in-vivo transplantation to repair nervous system injury.

Abstract: A suspension device includes a suspender, a suspension housing, and a positioning assembly, the suspender being mounted on the suspension housing, the positioning assembly including a suspension substrate, an elastic member, a button and wall-in screws, a first locking arm and a second locking arm being respectively extended from two ends of the suspension substrate, an assemble bore being formed on the second locking arm, a blind hole being formed on the button, the upper end of the elastic member being coupled to the suspension substrate and being arranged between the first locking arm and the second locking arm, the lower end of the elastic member being snapped into the blind hole, a socket and a through hole being formed on the suspension housing, the first locking arm being engaged with the socket, the button being successively gone through the assemble bore and the through hole.