18results about How to "Resolve Sensitivity" patented technology

The invention relates to the technical field of relay protection, in particular to a power distribution network relay protection collaborative optimization method and system considering new energy, and the method comprises the steps: constructing a model architecture of a power distribution network; based on the new energy access characteristics, the topological structure of the power distribution network and the line parameters of the power distribution network, performing simulation and calculation on a short-circuit fault possibly occurring in the power distribution network to obtain a short-circuit current calculation result; determining relay protection equipment of the power distribution network according to the topological structure of the power distribution network, and determining a protection constant value of each protection section of the relay protection equipment according to a short-circuit current calculation result and a protection constant value setting principle; establishing an optimization model to update an iteration decision variable, and obtaining an optimal solution of the decision variable; and adjusting the configuration of the relay protection equipment according to the optimal solution of the decision variable. By comprehensively considering the influence of new energy access on short-circuit current distribution, the reliability and effectiveness of a relay protection system are improved, and the economic operation efficiency of a power distribution network is enhanced.

The invention belongs to the technical field of nondestructive testing, and relates to a high-sensitivity ultrasonic testing method for an oversized metal billet based on multi-probe combination. According to the method, the bimorph longitudinal wave normal probes and the single-wafer longitudinal wave normal probes with different parameters are jointly used, and reasonable selection of detection partitions, detection surfaces and sensitivity adjustment modes is combined, so that high-sensitivity detection of the oversized metal billets with the thickness of 500-1000mm is realized, and meanwhile, relatively high near-surface resolution is ensured. According to the invention, the background noise of the material is reduced, the detection signal-to-noise ratio is improved, effective detection of the metal billet with the maximum thickness of 1m can be realized, the detection sensitivity can reach the equivalent weight of a flat-bottomed hole with the diameter of 1.2 mm, meanwhile, the near-surface resolution is superior to 2-5mm, a large number of reference blocks are not required to be manufactured, the cost is reduced, and field operation is facilitated. According to the method, the problem that ultrasonic detection of the oversized metal billets cannot be detected or the detection sensitivity is low at present can be solved, and an effective means is provided for controlling the internal quality of raw materials for large metal parts.

The invention discloses an ion trap mass spectrometry device and method capable of switching internal and external ion sources, and the device comprises an ion source cavity, the exterior of the ion source cavity is provided with a heating module, the side wall of the ion source cavity is provided with a sample introduction hole, and the sample introduction hole is internally provided with a chromatographic column I; the electron beam generation system is arranged at the front side position of the ion source cavity; the insulation connecting piece is communicated with the ion source cavity, and a lens I, a lens II and a lens III are sequentially arranged in the insulation connecting piece in the sample injection direction; a signal acquisition system; wherein a chromatographic column II is arranged on the ion trap. The two ionization modes inside and outside the trap are integrated, and different detection requirements can be flexibly met by switching the sample introduction path of the chromatographic column and regulating and controlling the voltage parameters of the lens I, the lens II and the lens III.

The invention relates to the technical field of emergency lighting power-off detection, in particular to a high-sensitivity power-off detection method for an LED emergency lighting device, and the method comprises the steps: arranging a main control emergency device before an emergency circuit is installed; a master-slave communication control mode is adopted for a plurality of emergency devices connected in parallel; when a live wire input L phase and a null line input N phase are in a parallel mixed connection state in the emergency device, an operation switch is "on-off-on-off", a DPL and a DPN of the master control emergency device output complementary square wave signals, ACL and ACN in the "master-slave" emergency device carry out square wave pulse width signal learning, and high and low level output phases of the ACL and the ACN are adjusted; and the level is detected through an internal emergency detection circuit. The invention aims to detect the pulse width of the synchronous signal by adopting a master control communication control mode, realize emergency detection logic identification and improve the sensitivity of power-off detection of the emergency device.

The application discloses a three-dimensional wrapped structure silicon-based germanium photoelectric detector and a preparation method, and solves the problem of the increase of chip area and the uneven frequency response of a silicon-based germanium photoelectric detector in the prior art in the process of pursuing high bandwidth, and realizes the combination of high bandwidth and high responsivity and the optimization of intrinsic frequency response; the detector comprises a silicon-on-insulator (SOI) substrate, the SOI substrate comprises a silicon substrate layer, a buried oxygen layer and a device layer silicon from bottom to top in sequence; the device layer silicon comprises a silicon waveguide region and a carrier collection region located at the end of the silicon waveguide region; a germanium active absorption region is arranged above the carrier collection region, and a three-dimensional silicon wrapping structure composed of first and second polarity doped silicon regions; the polarity doped silicon regions are located on opposite sides of the germanium active absorption region respectively; and the polarity doped silicon regions are in direct contact with the two side walls of the germanium active absorption region, the polarity doped silicon regions form three-dimensional wrapping of the germanium active absorption region from the side and the top, and a three-dimensional charge collection interface is constructed.

The invention discloses a quantum measurement method and device, electronic equipment and a storage medium, and the method comprises the steps: carrying out the steady-state processing of an initial entangled photon pair based on a preset steady-state strategy, and obtaining a target entangled photon pair; detecting the target entangled photon pair to obtain target photon data; and executing a data analysis operation on the target photon data to obtain a target quantum key. The technical problem of low sensitivity and accuracy of optical measurement caused by difficulty in generation and maintenance of the entanglement state in the quantum measurement technology in the prior art is solved.

This invention provides a frequency-shifted multi-channel Rydberg atomic electromagnetic pulse detection device, method, and apparatus, relating to the fields of quantum precision measurement technology and electromagnetic pulse detection technology. The device's frequency-shifted detection light emission module outputs multiple detection beams with different preset frequency shifts, and incidents these beams parallel, coplanar, and non-overlapping onto an atomic gas cell. A paired coupling light emission module outputs multiple coupled beams, also incident parallel, coplanar, and non-overlapping onto the interior of the atomic gas cell, ensuring that each coupled beam and its corresponding detection beam within the atomic gas cell are arranged in opposite directions along the same optical axis. The atomic gas cell forms multiple transient electromagnetic pulse detection channels under the combined action of the multiple detection beams and the multiple coupled beams. This invention solves the problem that single-channel Rydberg sensors cannot capture the complete waveform of a large dynamic transient electromagnetic pulse in a single real-time event, achieving complete detection of transient electromagnetic pulses over a large dynamic range.

The invention discloses an amorphous alloy elastomer and a torque sensor for robot joints, the chemical formula of amorphous alloy is ZraTibFecNbdMe, M is one element of Cr, Al, B or S, and a, b, c, d and e meet the following conditions: 40 < = a < = 55, 12 < = b < = 27, 6 < = c < = 20, 3 < = d < = 20, and 0 < = e < = 6. The torque sensor comprises an amorphous alloy elastic body and a strain gauge, the amorphous alloy elastic body is a circular sheet-shaped elastic body, the sheet-shaped elastic body comprises a fixed mounting surface, strain grooves with side walls and bottom walls are formed in the upper side and the lower side of the fixed mounting surface, the strain grooves are in through connection through through grooves, and the through grooves comprise a first groove and a second groove; the width of the through groove is 0.8-1.0 mm. The strain gauge is arranged on the bottom wall of the strain groove. The amorphous alloy elastomer can have high yield strength, low Young modulus and high elastic limit at the same time, and the problem that rigidity and sensitivity of a sensor are difficult to harmonize is solved.

The invention relates to an ultrahigh-sensitivity radiation source detection method, which comprises the following steps of: receiving an initial signal by adopting an array antenna, completing comprehensive aperture electromagnetic imaging processing to obtain a radiation source energy distribution image, extracting the signal-to-noise ratio of each pixel point in the radiation source energy distribution image, and determining whether the target is an effective target or not through threshold detection; if the effective target is detected, recording the position, the processing frequency, the bandwidth and the time width of the signal; if no effective signal is detected, traversing the signal processing bandwidth and the time domain accumulation time of the synthetic aperture electromagnetic imaging processing, carrying out the synthetic aperture electromagnetic imaging processing until an effective target can be detected, and recording the position, the processing frequency, the bandwidth and the time width of the signal; a target signal incoming wave direction angle and a target position are extracted based on a radiation source energy distribution image, coherent synthesis of N sub-array sampling signals is completed based on the incoming wave direction angle and position parameters of the N sub-arrays, and parameter measurement is completed based on a synthesis signal.

The invention belongs to the technical field of food safety detection, and particularly relates to an Au NPs / MXene / WS2 composite material, a preparation method thereof and a sensor. The Au NPs / MXene / WS2 composite material comprises an MXene matrix, the MXene matrix is of a multi-layer organ-shaped structure, wrinkled WS2 nanosheets are loaded between layers of the MXene matrix, and an MXene / WS2 substrate is formed; gold nanoparticles are loaded on the surface of the MXene / WS2 substrate; wherein the particle size of the gold nanoparticles ranges from 100 nm to 150 nm. The photoelectrochemical sensor prepared on the basis of the Au NPs / MXene / WS2 composite material has the advantages of separation of an input signal and an output signal, simplicity in operation and easiness in miniaturization, and meets the requirement of on-site rapid detection.

The application belongs to the technical field of biomedical detection, and discloses a biomarker for detecting ocular fundus neovascular disease, a detection kit and application. The biomarker for detecting ocular fundus neovascular disease is tRNA-derived fragment tRF-1001, the nucleotide sequence of the biomarker for detecting ocular fundus neovascular disease is SEQ ID NO:1, and the detection primer of the biomarker for detecting ocular fundus neovascular disease is SEQ ID NO:4 and SEQ ID NO:5. The application uses real-time fluorescent quantitative PCR technology to detect the relative content of tRNA-derived fragment tRF-1001 in aqueous humor, and provides a new detection marker and prognosis evaluation method for ocular fundus neovascular disease. The application proves that it is completely feasible to realize the diagnosis of ocular fundus neovascular disease by detecting the expression of tRF-1001 in the aqueous humor of patients, and has the characteristics of small trauma and simple operation.

The invention discloses an intelligent early warning method based on coal mine underground gas analysis, and relates to the technical field of intelligent control, and the method comprises the steps: collecting coal mine underground space setting and structure information, constructing a mine simulation module, connecting with a mine monitoring system, and synchronizing mine operation state information; video information in a mine is collected through an infrared thermal imager, multi-segment video information is obtained, image recognition processing is carried out, and gas leakage characteristics are obtained; performing traversal comparison on the gas leakage characteristics and a preset early warning characteristic set, determining gas early warning state information, performing fitting positioning with a mine simulation module, determining gas early warning states of all positions of a mine, matching an early warning strategy, and performing early warning control. The technical problem that in the prior art, sensitivity and accuracy of intelligent analysis and early warning of coal mine underground gas are low is solved, and the technical effect that the accident probability is reduced by improving the sensitivity and accuracy of intelligent analysis and early warning of coal mine underground gas is achieved.

The invention discloses a transducer and a manufacturing method thereof. The transducer comprises a conductive backing, a composite piezoelectric layer, a first matching layer and a second matching layer, the composite piezoelectric layer is arranged on one side of the conductive backing; the first matching layer is arranged on the side, away from the conductive backing, of the composite piezoelectric layer, and the first matching layer comprises graphite and epoxy resin; the second matching layer is arranged on the side, away from the composite piezoelectric layer, of the first matching layer, and the material of the second matching layer is different from that of the first matching layer. By the adoption of the transducer, the problem that an existing transducer is low in sensitivity and bandwidth is solved, and the transducer has the beneficial effects of improving the sensitivity and the bandwidth.

The invention discloses an integrated high-voltage cable on-line monitoring system, which relates to the technical field of power system monitoring, and comprises a data preprocessing unit, a mathematical modeling and training unit, a data processing unit, a data processing unit, a data processing unit and a data processing unit, the fault prediction unit is used for establishing a high-voltage cable operation state multi-dimensional correlation model and a fault prediction model and training historical data by using a convolutional neural network and long-short-term memory network hybrid algorithm, and the fault diagnosis and prediction unit is used for fusing temperature, partial discharge and sheath circulation characteristics based on the multi-dimensional correlation model and the fault prediction model so as to predict the fault of the high-voltage cable. According to the method, three core dimensions of distributed temperature, tunable UHF partial discharge and self-adaptive sheath circulation are integrated for the first time, a T-PD-ISC multi-dimensional correlation model is established, the problem that multi-factor coupling faults cannot be reflected through single-point or few-parameter monitoring in the prior art is solved, and the method has the advantages of being high in reliability, low in cost and high in reliability. And the accuracy of fault identification is obviously improved.

This invention provides a field-effect transistor (FET) gas sensor and its fabrication method, comprising: providing a clean substrate; forming a dielectric layer on the substrate; forming a source and a drain on the dielectric layer; forming a two-dimensional material layer between the source and drain; and forming an organic layer on the source, drain, and two-dimensional material layer. The heterojunction channel formed by the two-dimensional material layer and the organic layer enables the gas sensor to achieve stable and sensitive gas sensing. Simultaneously, by using the substrate as the bottom gate, in conjunction with the source and drain, a gate-controlled gas response function can be achieved. Thus, the gas sensor possesses excellent electrical performance and operational stability while exhibiting superior gas response sensitivity, solving the problem of how to improve the sensitivity and operational stability of gas sensors.

The invention discloses a terahertz X-type metasurface sensing device based on quasi-continuous bound state sensibilization. The terahertz X-type metasurface sensing device comprises an ultrathin transparent medium substrate; the X-type patterned metal metasurface structure unit is deposited on the ultrathin transparent medium substrate; wherein each X-shaped patterned metal metasurface structure unit comprises a plurality of resonant bodies which are periodically arranged, and a metal connecting belt for connecting the adjacent resonant bodies; the resonance body is of an X-shaped structure composed of trapezoidal metal blades. The trapezoidal metal blades comprise upper blades and lower blades, and the symmetry of the X-shaped structure in the vertical direction is destroyed according to the height difference between the upper blades and the lower blades, so that the resonance mode of the resonance body is converted into a quasi-continuous domain bound state from a continuous domain bound state. The X-shaped structure provided by the invention is simple in design and easy to prepare, the provided detection sensitivity is higher than the sensitivity of the current terahertz metasurface device, and the technical problems that the current terahertz metasurface device is complex in structure and low in detection sensitivity can be effectively solved.

The invention provides a high-voltage bushing partial discharge test device and method in an unshielded space. The device is characterized in that a shielding cavity assembly is filled with insulating gas; the two inner high-voltage electrode assemblies are arranged in the shielding cavity assembly; a shielding type high-voltage test power supply; the first ends of the first high-voltage lead assembly and the second high-voltage lead assembly are respectively connected to the shielding type high-voltage test power supply; the second end of the first high-voltage lead assembly and the second end of the second high-voltage lead assembly are connected with the two inner high-voltage electrode assemblies respectively. The first input end and the second input end of the differential measurement unit are respectively coupled to the tested casing pipe and the reference casing pipe, and signals of the two loops are acquired and compared. According to the invention, on-site balance method partial discharge measurement is realized through two bushings with similar capacitance, a traditional oil tank is replaced by a shielding cavity filled with an insulating gas medium, and an integrated test platform of two test bushings with similar capacitance, the shielding cavity filled with the insulating gas medium and a balance / differential measurement loop is constructed on an engineering site.