Abstract: Disclosed is a magnetorheological intelligent fixture for grinding, including a container (1), a water bladder (2), a pressure transmitter (4), a water pump (15), a first electromagnet (8), a controller (10), and an elastic telescopic rod. The elastic telescopic rod is disposed at a bottom of the container (1). Each side wall of the container (1) is provided with the water bladder (2). The water bladders (2) are mutually communicated. The water bladders (2) are respectively communicated with the pressure transmitter (14) and the water pump (15) respectively. The water pump (15) is connected to the water tank (6). A workpiece to be clamped is disposed at a top of the elastic telescopic rod. The container (1) is disposed above the first electromagnet (18). The first electromagnet (8), the pressure transmitter (4), and the water pump (15) are all electrically connected to the controller (10).

Abstract: A solid-state passive evaporative cooling system includes a hydrogel body, a water supply channel, a hydrogel root, and a water supply device. One end of the water supply channel is embedded into the hydrogel body, and a plurality of water outlets are formed in an outer wall of the water supply channel embedded into the hydrogel body. A water inlet at the other end of the water supply channel is connected to the water supply device which is configured to pump an aqueous solution into the water supply channel. The hydrogel root is disposed within the water supply channel. The aqueous solution is solidified by the hydrogel body to achieve the water-saving effect. During evaporative cooling, an osmotic pressure may be spontaneously created or enhanced within the system. The water supply channel is capable of adjusting the water content of the hydrogel body and providing a water supply driving force.

Abstract: The present disclosure belongs to the field of radio frequency circuit design, and in particular relates to a M×N millimeter wave and terahertz planar dipole end-fire array antenna. The M×N millimeter wave and terahertz planar dipole end-fire array antenna is composed of M paths of N× end-fire linear array antennas arranged at equal intervals, and the distance d between two adjacent N× end-fire linear array antennas is less than ?, where ? is the wavelength, and both M and N are integers greater than 1. By connecting linear type feed networks of the M paths of N× end-fire linear array antennas to M-path in-phase radio frequency signal transmitter and controlling the distance between two adjacent N× end-fire linear array antennas to be less than the effective wavelength, a higher gain and a higher half-power width can be realized, and the power consumption of the transmitter can be reduced.

Abstract: The present disclosure provides a magnetic grinding device and a magnetic grinding control method, and relates to the field of machining. According to the device, a magnet platform of a grinding piece fixing table is connected with an electromagnet; the grinding piece fixing table is used for fixing a to-be-ground workpiece; an output end of a programmable power supply is connected with a coil of the electromagnet; a permanent magnet grinding rod is located above the to-be-ground workpiece; and a magnetic grinding control system is connected with the programmable power supply and is used for acquiring grinding points, on the to-be-ground workpiece, of the permanent magnet grinding rod, and controlling an output voltage of the programmable power supply by utilizing a removal amount of a blank workpiece surface shape of the to-be-ground workpiece, the grinding points and a pulse width modulation (PWM) control method.

Abstract: Disclosed is a magnetorheological intelligent fixture for grinding, including a container (1), a water bladder (2), a pressure transmitter (4), a water pump (15), a first electromagnet (8), a controller (10), and an elastic telescopic rod. The elastic telescopic rod is disposed at a bottom of the container (1). Each side wall of the container (1) is provided with the water bladder (2). The water bladders (2) are mutually communicated. The water bladders (2) are respectively communicated with the pressure transmitter (14) and the water pump (15) respectively. The water pump (15) is connected to the water tank (6). A workpiece to be clamped is disposed at a top of the elastic telescopic rod. The container (1) is disposed above the first electromagnet (18). The first electromagnet (8), the pressure transmitter (4), and the water pump (15) are all electrically connected to the controller (10).