9results 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.

According to the metal filling groove structure and the preparation method thereof, the insulating film layer is arranged between the first metal layer and the second metal layer, the second metal layer is ground firstly in the CMP technology process of the metal filling groove by adopting an eddy current sensor, and due to the insulating effect of the insulating film layer, the first metal layer is ground, and the second metal layer is ground; turbine current noise generated by the first metal layer in the groove can be shielded, and the Endpoint end point grabbing accuracy of grinding of the second metal layer is improved. Meanwhile, particularly, when the first metal layer on the surface of the wafer is ground, due to the insulation effect of the insulation film layer, the lowest point of the insulation film layer in the groove area is located at the position of-500 nm to 500 nm at the top of the groove, and therefore the grinding efficiency of the first metal layer on the surface of the wafer is improved. The influence of turbine current noise generated by the first metal layer in the groove on turbine current during grinding of the first metal layer on the surface of the wafer can be effectively shielded, and the Endpoint end point grabbing accuracy is improved; in addition, turbine current signals can be integrally improved, and the CLC and RTPC functions for automatically adjusting the uniformity of the surface of the wafer are enhanced.

The application relates to the technical field of semiconductor manufacturing equipment, in particular to an anti-interference positioning device. The anti-interference positioning device comprises an anti-interference device, a positioning mechanism and a non-contact connecting assembly; the anti-interference device has an accommodating space in the interior; the non-contact connecting assembly comprises a first connecting piece and a second connecting piece which are arranged at intervals, the first connecting piece is connected with the anti-interference device, the second connecting piece is connected with the positioning mechanism, the first connecting piece can provide a suspension force to the second connecting piece and adjust the suspension force according to interference conditions, so that the positioning mechanism is suspended at and kept at a predetermined position in the accommodating space. The anti-interference positioning device, because the positioning mechanism is connected with the anti-interference device in a non-contact mode, the positioning mechanism will not vibrate with the anti-interference device, the positioning mechanism can be kept stable, and high-precision positioning of a workpiece is realized.

The invention discloses a high-frequency magnetic field excited tiny metal particle detection system and detection method. The system comprises a high-frequency signal excitation module, a high-frequency signal amplification circuit module, a nested metal particle detection device, a signal processing module, an upper computer, a power supply module and the like, the high-frequency signal excitation module is used for generating a high-frequency sinusoidal signal with stable and adjustable frequency, phase and amplitude; the high-frequency signal amplification module is used for amplifying the high-frequency sinusoidal signal and converting the high-frequency sinusoidal signal into a current signal to drive an excitation coil; an excitation coil in the nested metal particle detection device is used for generating an alternating magnetic field, and an induction coil is used for inducing magnetic field change caused by metal particles; the signal processing module is responsible for processing and extracting particle signal feature information and displaying the particle signal feature information through the upper computer. The nested metal particle detection device is seamlessly connected in the pipeline, the pipeline cannot be damaged, liquid cannot be polluted, and detection of smaller metal particles can be met by effectively combining high-frequency magnetic field excitation and the nested detection device.

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 belongs to the technical field of power equipment, and discloses a converter transformer residual magnetism detection sensor and a preparation method thereof. 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 packaged in the shell; the shell is made of a non-ferromagnetic material, and the adsorption block is made of a ferromagnetic material; the pressure sensor is a flexible pressure sensor, and the flexible pressure sensor comprises a dielectric layer and electrode layers arranged on the two 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 an iron core of a converter transformer and an adsorption block, the adsorption block is used for compressing the pressure sensor under the action of residual magnetism in the iron core, and the pressure sensor is used for outputting a pressure value signal under compression of the adsorption block. The technical scheme disclosed by the invention can be used for detecting the residual magnetism of the converter transformer, and has relatively high residual magnetism detection precision and accuracy.

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.

The present invention provides a double-circuit magnetic flaw detection sensor for steel wire rope, including a magnetic field generating module, a magnetic field detecting module, a DC signal preprocessing module, an AC signal adder, a DC signal processing module, a single-chip analog-to-digital conversion module, a power supply module, and a host computer intelligent processing module display module; it first evaluates the wear condition of the entire steel wire rope by measuring the diameter change of the steel wire rope as a whole, intelligently sets the basic parameters of the flaw detection software, and then performs fine detection, and finally achieves the purpose of accurately measuring the internal and external damage of the steel wire rope, and can monitor the transmission speed of the sensor to the measured steel wire rope damage signal, and realize the quantification of the steel wire rope damage signal by querying the signal standard in the database in combination with the size of the damage signal. The present invention works stably and reliably, has a wide range of practical applications, greatly improves the measurement sensitivity and accuracy, and makes it easier and more accurate to find the damage condition of the steel wire rope, and realizes the quantification of the steel wire rope damage.