4results about How to "Shielding effect" patented technology

The application belongs to the technical field of power equipment, and discloses a converter transformer residual magnetism detection sensor and a preparation method thereof; wherein the converter transformer residual magnetism detection sensor comprises a shell, a pressure sensor and an adsorption block; the pressure sensor and the adsorption block are both encapsulated in the shell; the shell is made of non-ferromagnetic material, and the adsorption block is made of ferromagnetic material; the pressure sensor is a flexible pressure sensor, which comprises a dielectric layer and electrode layers arranged on both sides of the dielectric layer respectively; the converter transformer residual magnetism detection sensor is used for being installed on a transformer oil tank; the pressure sensor is located between the core of the converter transformer and the adsorption block; the adsorption block is used for compressing the pressure sensor under the action of residual magnetism in the core; and the pressure sensor is used for outputting a pressure value signal under the compression of the adsorption block. The technical scheme disclosed by the application can be used for detecting the residual magnetism of the converter transformer, and has high residual magnetism detection precision and accuracy.

The application relates to the technical field of nanobiosensors, and discloses a bimodal nanoprobe for uric acid detection and a preparation method and application thereof. The bimodal nanoprobe is a fluorescence-photothermal bimodal nanoprobe, and is a core-shell structure nanoparticle, which comprises, from the inner layer to the outer layer, a) a fluorescent inner core composed of carbon dots and a silica layer coated outside the carbon dots; b) a manganese dioxide layer coated outside the fluorescent inner core; and c) a molecularly imprinted polymer layer coated outside the manganese dioxide layer. The bimodal nanoprobe in the application integrates a fluorescence signal source (carbon dots), a signal modulation and photothermal unit and a specific recognition layer (a uric acid molecularly imprinted polymer) through ingenious structure design, realizes bimodal sensing of "specific recognition -> MnO2 etching -> fluorescence recovery / photothermal weakening" on UA, and effectively solves the problems of poor selectivity, complicated operation and high cost of traditional methods.

The application relates to a preparation method and application of a ZIF-8 / Thi / Au-based ratio type electrochemical aptamer sensor, and ZIF-8 / Thi / Au with a signal label function is combined with a catalytic hairpin assembly strategy for the first time to detect mycotoxins, signal amplification is effectively realized, and the detection sensitivity is improved. ZIF-8 / Thi / Au composite materials are synthesized first, and a signal label is prepared by combining a hairpin chain 2. When aflatoxin B1 exists, aflatoxin B1 is combined with an aptamer chain, a complementary chain that is dropped off opens a hairpin chain 1, catalytic hairpin assembly is carried out after a signal label is added, the signal label is combined on the electrode surface, the electrode surface has a high resistance value, and a buffer solution containing [Fe(CN)6] 3‑ / 4‑ is used to carry out electrochemical measurement by using a square wave voltammetry method, a higher ZIF-8 / Thi / Au signal and a lower [Fe(CN)6] 3‑ / 4 signal can be obtained. When no aflatoxin B1 exists, the changes of the two electrochemical signals are opposite. Finally, an electrochemical aptamer sensor for detecting aflatoxin B1 is obtained by the change of the ZIF-8 / Thi / Au and [Fe(CN)6] 3‑ / 4 signal ratio.

The invention discloses a ceramsite concrete block pouring device, which relates to the technical field of building material production, and comprises a base and a pouring mechanism, the upper end of the base is symmetrically and fixedly connected with two electric sliding rails, and the side walls of the two electric sliding rails are jointly and slidably connected with a portal frame. The pouring mechanism comprises a distribution pipe fixedly connected to the upper end of the portal frame, the lower end of the distribution pipe penetrates through the top in the portal frame and is fixedly connected with a pouring head, a plurality of pouring openings are formed in the bottom in the pouring head, the inner wall of each pouring opening is rotationally connected with a valve plate through a pin shaft, and the other end of each valve plate is rotationally connected with a flow guide plate through a pin shaft. The lower end of the pouring head is fixedly connected with multiple vertical frames. According to the invention, by dispersing multi-strand instantaneous material distribution, a traditional centralized accumulation material distribution mode is changed, so that the aggregate distribution in the formed building block is extremely uniform and has no density gradient, and the consistency of mechanical properties and the stability of thermal insulation performance of a product are improved.