42results about How to "Efficient shielding" patented technology

The invention discloses a difunctional gypsum admixture as well as a preparation method and application thereof, and belongs to the technical field of building material admixtures. According to the invention, vegetable tannin is coated on the surfaces of metal oxide nanoparticles, and another metal ion is coordinated on a tannic acid coating layer to assemble core-shell structure nanoparticles, so that the difunctional gypsum admixture is obtained. The difunctional gypsum admixture provided by the invention can delay the gypsum coagulation time and increase the plasticity time of gypsum slurry, after the admixture accounting for 10-50% of the mass of gypsum is introduced, the initial setting time of the gypsum is prolonged to 20-70 min, meanwhile, the assembly of the core-shell structure gives full play to the synergistic effect of the two high Z elements, efficient shielding of the gypsum to X rays is realized, and the strength of the gypsum is improved. Meanwhile, the problem that metal oxide nanoparticles are difficult to uniformly and stably load on gypsum crystals is solved.

The utility model discloses a high-precision parallel-plate capacitive sensor structure, which belongs to the field of parallel-plate capacitive sensors and comprises a bottom plate, a sensor assembly is arranged on the bottom plate and consists of an upper polar plate and a lower polar plate, the upper polar plate and the lower polar plate are fixedly mounted on two insulating support columns respectively, and a distance adjusting mechanism is mounted on the bottom plate. The bottom plate is further provided with a shielding mechanism, the shielding mechanism comprises a permalloy shielding cover, a copper net is fixed in the permalloy shielding cover, a rectangular groove is formed in the top of the bottom plate, and the permalloy shielding cover and the copper net are installed in the rectangular groove in an embedded mode. According to the utility model, through the arrangement of the shielding mechanism, the effect of efficiently shielding various electromagnetic interferences is achieved, a double-layer structure formed by the permalloy shielding cover and the internal copper net can shield a low-frequency magnetic field and high-frequency electromagnetic radiation respectively, and permalloy has a good magnetic conduction shielding effect on the low-frequency magnetic field.