Abstract: Provided are a nano-titanium dioxide (NT)/biochar (BC) composite, and a preparation method and use thereof, which belong to the technical field of cement-based materials. NT is introduced into a porous structure of the micron-sized BC, which not only addresses the high aggregation of NT, but also reduces Ca(OH)2 size and crystal growth orientation through effects such as filling and nucleation brought by NT in the porous structure of BC. In this way, more C—S—H gels are generated to fill the pores, thereby improving an interfacial transition zone (ITZ), which enhances the mechanical properties such as compressive strength and flexural strength.

Abstract: The present disclosure discloses a swing structure and a corresponding water outlet device. A water passing chamber in a body of the swing structure is equipped with a swing member, and an upper end of the swing member is provided with a recess facing a water inlet hole of the water passing chamber. The water flow impacts the recess to drive the swing member to swing to one side randomly. After a lower end of the swing member is out of range of a water outlet hole of the water passing chamber, the upper and lower ends of the swing member are adjacent to or abut against a wall of the water passing chamber, so that the swing member can swing back and forth.

Abstract: Disclosed is an eddy current flaw detection system based on a NV (nitrogen-vacancy) color center quantum sensing technology, relating to the technical field of quantum sensing. The system includes a laser transceiver processing unit, a quantum sensor, an excitation coil, a power supply unit, a microwave coil, and a microwave unit. The diamond NV color center precision measurement technology and the eddy current nondestructive flaw detection technology are combined in accordance with the present disclosure. Compared with the traditional technology, the remarkable performance of the diamond NV color center can improve the accuracy of eddy current nondestructive flaw detection and achieve the accurate detection of fine crack defects. Meanwhile, a detection method for an alternating current magnetic field is designed according to the characteristics of the eddy current nondestructive flaw detection.

Abstract: The present disclosure discloses a swing structure and a corresponding water outlet device. A water passing chamber in a body of the swing structure is equipped with a swing member, and an upper end of the swing member is provided with a recess facing a water inlet hole of the water passing chamber. The water flow impacts the recess to drive the swing member to swing to one side randomly. After a lower end of the swing member is out of range of a water outlet hole of the water passing chamber, the upper and lower ends of the swing member are adjacent to or abut against a wall of the water passing chamber, so that the swing member can swing back and forth.