Abstract: A rotating four-dimensional intracardiac ultrasound imaging system including an ultrasound system, a slip ring, a host end connector, a catheter end connector, a motor, a one-dimensional transducer, a sheath and a torque coil is introduced. The ultrasound system is connected to the transducer through the slip ring, two connectors, a cable and the torque coil in sequence. The motor drives the slip ring, connectors, torque coil and transducer to rotate unidirectionally and uniformly at a high speed. Meanwhile, the transducer is for two-dimensional imaging and acquires multiple two-dimensional images uniformly around the rotation axis. Then multiple two-dimensional images acquired at different rotation angles are reconstructed as four-dimensional images.

Abstract: A four-dimensional ultrasound imaging system including an ultrasound system, a two-dimensional capacitive ultrasound transducer, and an ASIC (Application Specific Integrated Circuit) chip is introduced. Specifically, a transmission driving circuit and a receiving circuit are integrated in the ASIC for driving the transducer to transmit ultrasound beams and receive reflected echoes. The ASIC is configured to perform microchip pre-beamforming on the received signals to reduce channel number, and then the processed signals are transmitted to the ultrasound system for analog to digital conversion, beamforming and coordinate conversion. A four-dimensional ultrasound image is obtained by fast and repeatedly acquiring three-dimensional images. In the present application, the ASIC chip is integrated in the transducer, so that the two-dimensional transducer can have fewer wires.

Abstract: A circuit board, a backlight module, a display module, and an electronic device are provided. The circuit board includes at least two sub-boards that are spaced apart, the sub-boards extend in a first direction and are arranged in a second direction, the sub-board includes a connection part, connection parts in adjacent sub-boards are connected to each other to form a common connection part, and the common connection part extends in the second direction. A plurality of functional devices and at least one driver chip are fastened on the sub-board. The sub-board is divided into a plurality of partitions, and each partition includes at least one functional device.

Abstract: The present disclosure relates to a high-strength concrete and a preparation method thereof. The high-strength concrete includes lignin, recycled fine powder, cement, water, sand, gravels and a water reducing agent. The recycled fine powder is recycled fine powder of discarded concrete, and is prepared by separating solid waste of discarded buildings, then performing impurity removal and crushing processing, and grinding same by a ball mill into dust with a particle size of less than 0.16 mm. The lignin is discarded wood lignin, which is prepared by crushing the wood, stirring and extracting a sodium hydroxide aqueous solution with a mass concentration of 5% for 1 to 2 hours at the temperature of 80 DEG C. to obtain a black lignin alkali solution, adding a hydrochloric acid solution with a mass concentration of 30% into the alkali solution for stirring, and making the pH reduced to 7.0 for standing and layering.

Abstract: The present disclosure relates to a high-strength concrete and a preparation method thereof. The high-strength concrete includes lignin, recycled fine powder, cement, water, sand, gravels and a water reducing agent. The recycled fine powder is recycled fine powder of discarded concrete, and is prepared by separating solid waste of discarded buildings, then performing impurity removal and crushing processing, and grinding same by a ball mill into dust with a particle size of less than 0.16 mm. The lignin is discarded wood lignin, which is prepared by crushing the wood, stirring and extracting a sodium hydroxide aqueous solution with a mass concentration of 5% for 1 to 2 hours at the temperature of 80 DEG C. to obtain a black lignin alkali solution, adding a hydrochloric acid solution with a mass concentration of 30% into the alkali solution for stirring, and making the pH reduced to 7.0 for standing and layering.

Abstract: Embodiments of the present invention disclose a photochromic lens module, a camera, and a terminal device. The photochromic lens module includes a lens module and a photochromic thin film. The lens module includes a first surface and a second surface. When the first surface is an incident surface, the second surface is a refractive surface; when the second surface is an incident surface, the first surface is a refractive surface. The photochromic thin film includes a first area and a second area. The photochromic thin film covers the first surface or the second surface. The first area uses a negative photochromic material, and the second area uses a positive photochromic material. By means of the embodiments of the present invention, a lens module can be effectively protected.

Abstract: Embodiments of the present invention disclose a photochromic lens module, a camera, and a terminal device. The photochromic lens module includes a lens module and a photochromic thin film. The lens module includes a first surface and a second surface. When the first surface is an incident surface, the second surface is a refractive surface; when the second surface is an incident surface, the first surface is a refractive surface. The photochromic thin film includes a first area and a second area. The photochromic thin film covers the first surface or the second surface. The first area uses a negative photochromic material, and the second area uses a positive photochromic material. By means of the embodiments of the present invention, a lens module can be effectively protected.