30results about How to "Raise the threshold" patented technology

The invention discloses a weight-constrained array antenna shaped beam gain optimization method and device, and the method comprises the steps: setting an array structure and target shaped beam parameters according to a set target; according to the relational expression of the weight and the directivity coefficient, constructing a shaped beam maximization directivity coefficient weight optimization model; obtaining an initial array weight according to the main lobe width of the target beam; solving and optimizing variables in the optimization model through an alternating direction multiplier method to obtain an optimization result, calculating an original error of the variables according to the result, and obtaining a maximum value of the original error through calculation; comparing the original error with a set error threshold, if the original error is smaller than the set error threshold, stopping iteration, and outputting a final array element weight; and if the original error is not smaller than the set error threshold, iteratively calculating the original error until a set iteration frequency is reached, and outputting a final array element weight. According to the invention, the main lobe gain can be improved and the amplitude dynamic range ratio can be reduced while the beam shape is satisfied.

The invention provides fluorescent conversion type red fluorescent powder for display as well as a preparation method and application thereof, and belongs to the technical field of light-emitting display materials. Metal Sr, metal Al and metal Eu are mixed and smelted according to the stoichiometric ratio and then ground to prepare alloy powder, lithium aluminum hydride powder and the alloy powder are ground, mixed, calcined and ground again, and the red fluorescent powder for laser display with high brightness under blue light excitation is prepared. According to the invention, an alloying method is combined with a nitriding method, and the molar ratio (greater than 70%) of Eu < 2 + > (radiative transition) in all Eu elements in the prepared fluorescent powder product is greatly increased, so that the prepared red fluorescent powder has high color purity, high luminous efficiency and thermal stability, and meanwhile, a sample has an ultrahigh saturation threshold value under the excitation of blue laser; the material can be applied to a fluorescence conversion type laser display technology, and has huge potential for laser display devices.

The invention discloses a working face end head top plate weakening anti-scour method, which adopts a mode of performing hydraulic slotting in a surrounding rock top plate of a roadway dangerous area of a working face end roadway to form a pressure relief slot, a retarding slot and a far-field dynamic load source breaking and expanding slot so as to improve the anti-scour capability of the working face end roadway. A pressure relief slot formed by hydraulic slotting on a roadway top plate can release static load of roadway surrounding rock, and a retarding slot formed by hydraulic slotting on a dynamic load propagation path can retard far-field dynamic load from being propagated to the roadway. The far-field dynamic load source breaking and expanding seam groove formed by hydraulic slotting in the rock mass near the dynamic load source can reduce the elastic energy density of the rock mass near the dynamic load source and reduce the possibility of roof breaking. According to the method, the energy capable of inducing the rock burst disaster can be jointly reduced in the three aspects of the generation condition of the dynamic load, the propagation path of the dynamic load and the static load of the surrounding rock, and the method is particularly suitable for solving the rock burst problem of the end roadway of the working face.

The invention discloses a manufacturing method and device for a multi-core optical fiber with a high SBS threshold value and application. The manufacturing method comprises the steps that S1, preparation work before drawing is conducted with the multi-core optical fiber as a raw material; s2, the wire drawing speed of the multi-core optical fiber is controlled to be gradually increased to 25 m / min from 14 m / min; s3, after the wire drawing speed reaches 25 m / min, the wire drawing speed of the multi-core optical fiber is controlled to be gradually reduced to 14 m / min from 25 m / min; s4, alternately carrying out the step S2 and the step S3 until the whole multi-core optical fiber is drawn; and S5, cutting the multi-core optical fiber prepared in the step S4 to prepare the conical multi-core optical fibers in batches. According to the technical scheme provided by the invention, the technical problems of complex equipment, tedious operation and relatively high cost existing in a mode selection mode adopted in manufacturing of the multi-core optical fiber in the prior art are solved.

The invention discloses application of a Cpeb3 gene inhibitor and a copper death inhibitor in preparation of a medicine for treating myocardial ischemia-reperfusion injury, and relates to the technical field of myocardial ischemia-reperfusion injury. By specifically reducing or knocking out Cpeb3 expression, myocardial repair can be remarkably promoted, action potential stability is improved, and the death rate is reduced. Therefore, Cpeb3 is a specific intervention target spot of copper death in Gpc6 + CMs. The small molecule inhibitor of Cpeb3 can remarkably reverse changes of copper death, aerobic respiration and / or glycolysis caused by Cpeb3 activation. In addition, the copper death inhibitor can improve the survival rate of myocardial cells, reverse the change of aerobic respiration and / or glycolysis induced by Cu, and reverse the change of glycolysis, pentose phosphate pathway and tricarboxylic acid cycle metabolites caused by Cu stimulation. Therefore, the invention provides a new solution for prevention and treatment of myocardial ischemia reperfusion injury, and has a good application prospect.

This application relates to the field of household appliance technology, and in particular to a refrigerator pressure switch and a refrigerator. A refrigerator pressure switch includes: a pressure switch assembly and a pressure transmission assembly. The pressure switch assembly is disposed on the refrigerator body; the pressure transmission assembly includes a base and a button. The base is mounted on the refrigerator body, the button is located on the base and sealed to the base, and the end of the button away from the base is disposed against the refrigerator door. The button and the base enclose a cavity, and the cavity is connected to the pressure switch assembly. The button retracts the base in response to displacement of the refrigerator door, forcing gas in the cavity into the pressure switch assembly, causing a pressure change within the pressure switch assembly. The pressure switch assembly responds to the pressure change to control the opening of the refrigerator door. This application, by additionally providing a pressure transmission assembly, can prevent condensation from occurring on the pressure switch assembly.

The utility model discloses provide an audio signal limiting circuit, include: at least one way limiting branch, any limiting branch includes: gain module is used for receiving audio signal, and carries out amplification processing to audio signal, generates audio amplification signal and exports, conversion module is used for converting the voltage type of audio amplification signal, obtains audio conversion signal, comparison module is used for according to the size between the voltage of audio conversion signal and threshold voltage, and output comparison signal, and comparison signal has first state and second state, limiting module is coupled with comparison module and gain module respectively, when comparison signal has first state, is in the gating state, and the passage between gain module and limiting module is gated to access limiting resistance, and when comparison signal has second state, is in the off state, and the passage between gain module and limiting module is disconnected to disconnect limiting resistance. Adopt above -mentioned technical scheme, can effectively limit the amplitude of audio amplification signal.

The present invention discloses a special resin prepreg preparation device for in-situ pipeline repair, comprising a tank body, an automatic residue collection component, a timed automatic rotation component and an anti-water absorption pneumatic suction cup component. The present invention belongs to the technical field of solid impurity filtration. In order to solve the problem that residues are mixed in the resin or deposited on the bottom of the tank body during the resin preparation process, the present invention proposes a device that senses the internal pressure of the tank body to automatically collect the residues. Moreover, in order to ensure that the filtered residues can work in a closed loop, an anti-water absorption pneumatic suction cup component and a timed automatic rotation component are creatively proposed to complete the circulation work of collecting the residues, effectively solving the problem of residue deposition during the heating reaction process, and significantly improving the efficiency and effect of filtering small solid particle impurities in the resin.

A motor is provided. A motor according to an aspect of the present invention includes: a cover; a first bearing coupled to the cover body; a rotating shaft rotatably coupled to the first bearing; a rotor coupled to the rotating shaft and disposed below the first bearing in the axial direction; a stator assembly disposed on the outside in the radial direction of the rotor; an impeller coupled to the rotating shaft and disposed below the rotor in the axial direction; a diffuser coupled to the cover body and disposed below the impeller in the axial direction; a second bearing coupled to a central region of the diffuser and to which the rotating shaft is rotatably coupled; the bearing support is arranged between the first bearing and the cover body; the elastic component is arranged between the bearing support and the cover body in the axial direction; the diffuser includes a plurality of diffuser ribs extending downward from a bottom surface.

The present invention relates to the technical field of intelligent driving, and discloses a method, system and medium for scoring the safety level of lane change of an autonomous driving vehicle. The method includes: obtaining the acceleration, speed, relative distance and heading angle of target vehicles around the vehicle; calculating the TTC of the target in front of the lane, the target lane and the target vehicle closest to the vehicle in front and behind the adjacent lane; judging whether the target in the adjacent lane will cut into the target lane; scoring the TTC and relative distance of each target vehicle, taking the minimum value of all scores as the final score, and determining whether the lane change is feasible based on the final score and the set score threshold for lane change. The present invention comprehensively considers the target vehicles in the lane, the target lane and the adjacent lane, aiming to improve the safety and personalized differentiation of lane change, and is used to solve the problem that the current safety judgment of lane change does not consider the target vehicle in the adjacent lane, and the safety level classification is too simple to meet higher personalized needs.

The puffed fish food is produced by using the whole fish meat as the raw material, and the product is rich in high-quality protein, EPA, DHA, collagen and mucopolysaccharide, and has extremely high nutritional value of the whole fish meat. Physical fishy smell removal of ginger and garlic cooking wine is utilized, meanwhile, 5-10 parts of fresh yeast and 5-10 parts of soybean cakes are used for preparing fishy smell removal liquid, biological fishy smell removal is conducted on 100 parts of fish meat, and the fishy smell of the fish meat is effectively removed. A two-section drying mode of first damp and hot drying and then dry and hot air drying is adopted, curing and drying processes are integrated, the production process is simplified, energy consumption is reduced, and low-carbon production is achieved. Puffing is carried out in a microwave mode, and no grease is added in the whole production process and formula, so that the food material tissue is puffed. According to the invention, the deodorized freshwater fish puffed food can be obtained, and the puffed food has a loose and porous structure and a crisp taste, does not contain exogenous grease, is high in protein and low in fat, and has extremely high nutritional value of whole fish meat.

The invention provides a reset circuit with an adjustable threshold value. The reset circuit comprises a first triode, a second triode, a third triode and a comparison circuit. Wherein the influence degrees of the first current and the second current by the power supply voltage are different, when the power supply voltage is small, the second current is larger than the first current, and when the power supply voltage is large, the first current is smaller than the second current, so that a special power supply voltage value exists, the first current is equal to the second current, and an overturning point of the reset circuit is set based on the special power supply voltage value. It can be seen that the first current is a negative temperature coefficient, the coefficient proportion can be adjusted by adjusting the first resistor and the second resistor, the second current is a positive temperature coefficient, and the coefficient proportion can be adjusted by adjusting the first resistor and the third resistor. When the threshold voltage is high, the ratio of the first resistor to the second resistor is adjusted, and the threshold value is increased. And meanwhile, the third resistor is adjusted to offset the positive temperature coefficient voltage and the negative temperature coefficient voltage, so that the influence of temperature drift is reduced.

The invention relates to a preparation method of a perovskite film blue light gain medium, and the method comprises the following steps: S1, raw material blending: dissolving a perovskite precursor and polyacrylonitrile (PAN) in ultra-dry dimethyl sulfoxide to obtain a mixed solution; wherein the mass ratio of the polyacrylonitrile (PAN) to the perovskite precursor is (0.3-0.4): 1; and S2, spin-coating film formation: taking the mixed solution on a glass substrate, and performing spin-coating film formation in an inert gas environment by using a spin-coating method to obtain the perovskite thin film blue light gain medium. The perovskite thin film prepared by the method can realize blue light lasing with low threshold and high optical gain, and has good stability in a high-humidity environment.

The invention discloses a GaN-based vertical micro-cavity Micro-LED based on electroplating technology and a preparation method thereof. The micro-cavity Micro-LED of the invention has a narrow half-height width of light emission and good light emission directionality. By thinning the chip thickness and using the metal reflector of the p-GaN layer (5) and the dielectric film reflector of the n-GaN layer as the end face of the resonant cavity, a vertical resonant micro-cavity structure is formed, which will suppress the light emission from the side wall and improve the directionality of the front light emission, thereby reducing the crosstalk effect between adjacent pixels of the Micro-LED display. At the same time, the resonant micro-cavity structure will select a specific wavelength to narrow its light emission spectrum and increase the spectral purity, which will be beneficial to improving the threshold of the Micro-LED display. The vertical structure Micro-LED of the invention has a large active area and less light absorption by n-GaN; the current expansion is good, the voltage is low, the current density is small, and it has advantages in light efficiency, saturation current, and long-term reliability; secondly, the Cu substrate has good electrical conductivity and thermal conductivity, and the chip thermal resistance is small.

This invention relates to a multi-dimensional confidence-based point-line fusion SLAM method and system for visually degraded environments, belonging to the fields of computer vision and robot navigation technology. The invention constructs a nonlinear mapping function based on two-dimensional image entropy, dynamically adjusts the gradient threshold and Gaussian smoothing parameters of the line feature extraction algorithm, and introduces a sudden illumination safety mode to enhance adaptability to extreme environments. It performs photometric consistency verification on point features after optical flow tracking, performs region growing on line features using the aforementioned adaptive parameters, and proposes a hierarchical non-convex relaxation algorithm guided by dual weights of geometric residuals and pixel gradients for noise-resistant fitting. It establishes a linear inverse mapping mechanism between front-end feature confidence and back-end optimization information matrix, dynamically adjusting residual weights according to feature quality. In motion-blurred and illumination-changing environments, it can effectively extract high-quality features and perform tight-coupling optimization, improving the positioning accuracy and speed of the SLAM system in weak-texture and drastically changing illumination environments.

According to the invention, fish processing byproducts are used as raw materials to produce the fishy smell-removed milt seasoning, and the product has rich flavor and higher nutritional value. The fishy smell in the fish byproducts is effectively removed by using a biological fishy smell removal method. A processing mode of enzymolysis (compound protease (the ratio of flavourzyme to papain is 4: 1), treatment at 50 DEG C for 1-3 hours) and Maillard reaction (mixing with D-xylose, and reaction at 110-120 DEG C for 40-80 minutes) is adopted, so that biomacromolecules which are difficult to utilize in the raw materials are effectively converted into rich flavoring substances, and the utilization rate of fish processing byproducts is increased. According to the invention, the fishy smell-removed milt seasoning can be obtained. The product is rich in variety of flavoring substances, and after being granulated and dried, the product is relatively low in water content and stable in property, and can be suitable for various scenes in daily life.

The invention relates to the field of water environment pollution treatment, in particular to a method for enhancing the heavy metal cadmium stress resistance of eel grass and application, resistance plant endophyte is extracted from herbaceous plants collected from a cadmium pollution area and colonized on the eel grass to enhance the heavy metal cadmium stress resistance of the eel grass; according to the method for enhancing the heavy metal cadmium stress resistance of the vallisneria natans, the threshold value of the heavy metal cadmium stress resistance of the vallisneria natans is effectively increased, the survival rate of the vallisneria natans in cadmium-polluted bottom mud is increased, the cadmium enrichment capacity of the vallisneria natans is increased, the cadmium pollution remediation capacity of the vallisneria natans is enhanced, and the vallisneria natans is better applied to the field of water ecological remediation.

The application discloses a kind of supersymmetry loss type semiconductor laser and preparation method, comprising: ridge waveguide and tapered gain waveguide integrated on the same epitaxial structure;Tapered gain waveguide is located at the output end of ridge waveguide;Tapered gain waveguide is provided with left supersymmetry waveguide and right supersymmetry waveguide, left supersymmetry waveguide and right supersymmetry waveguide are asymmetrically arranged on the two sides of tapered gain waveguide central axis, to divide tapered gain waveguide into three parts;The starting width of central amplification area between left supersymmetry waveguide and right supersymmetry waveguide is the same as the width of ridge waveguide;Left supersymmetry waveguide and right supersymmetry waveguide have unequal lateral width, the propagation constant of base transverse mode or high-order mode generated by the two respectively matches the high-order transverse mode propagation constant generated in ridge waveguide, and the high-order transverse mode in directional dispersion loss transmission process is dispersed by refractive index coupling mechanism, to realize base transverse mode single-mode laser output.

According to the fishy smell-removed chopped chili fish head prefabricated dish and the preparation method thereof, freshwater fish heads are adopted as raw materials to produce the aquatic product prefabricated dish, and the product is rich in high-quality protein, EPA and DHA and high in nutritional value. Physical deodorization of ginger and garlic cooking wine is utilized, meanwhile, 5-10 parts of fresh yeast and 5-10 parts of soybean cakes are utilized for preparing deodorization liquid, biological deodorization is carried out on 100 parts of fish heads, and the fishy smell of the fish heads is effectively removed. Tea polyphenol is adopted as an antioxidant and a bacteriostatic agent, so that the quality deterioration of the product in the freezing storage process is slowed down to the greatest extent. By means of the method, the freshwater fish chopped chili fish head prefabricated dish can be obtained, the product is high in nutritive value, portability, standardized production and efficient eating are integrated, and the requirements of modern people are perfectly met.

The invention discloses an application of physcion in preparation of analgesic products. The emodin monomethyl ether is used as a single active component, the pain relieving mechanism of the emodin monomethyl ether is deeply discussed, and it is proved that the emodin monomethyl ether can be used as a TRPV1 activity regulator, and expression of TRPV1 is effectively inhibited. Experiments find that the physcion can effectively reduce the twisting frequency of mice caused by acid, significantly increase the pain threshold value of the mice in a hot plate experiment and a CFA inflammatory pain experiment, show an effect of enhancing the pain resistance to heat and inflammation stimulation, and meanwhile, have a significant effect of relieving metastatic bone cancer pain of the mice. The physcion shows a remarkable analgesic effect on animals, and safety or toxic and side effects are not observed.

The present invention proposes a fiber optic sensor array with a large dynamic range, wherein the sensing units are more than two and are connected in sequence through transmission optical fibers, and the sensing units include a multiplexing coupler, a sensing / delay fiber loop, and a fiber optic interferometer. The scheme uses a fiber optic interferometer as the basis of a signal sensing unit, and embeds two high-sensitivity and / or low-sensitivity sensing units with positive and negative phases of a certain time delay in the fiber optic transmission multiplexing link, injects light pulses with a certain time interval and repetition rate, and then returns at the Faraday reflector of the fiber optic interferometer to form an interference pulse sensing sequence. The present invention has a variety of combination methods, and can choose to achieve the sensing characteristics of low noise and high saturation threshold of the array, so that the fiber optic sensor array has a large dynamic range of signal acquisition and restoration capabilities, so that it can adapt to the distortion-free acquisition of signals in various existing environments, and is well applied in the fields of sea and land invasion sound monitoring and seabed mineral resource exploration in complex environments.

A built-up environment index measuring method for remarkably improving activity amount of residents in a park comprises the steps of sampling annual built-up environment indexes and natural environment indexes xi in an L range around a sample park, collecting resident park activity amount data y in the same period, adopting spss software, applying a linear regression model, taking y as a dependent variable and xi as an independent variable, and calculating the activity amount of the residents in the park. Analyzing an independent variable xi having significant positive correlation with the dependent variable y to obtain a built environment index xi capable of significantly improving the activity amount y of the resident park; and writing R language codes according to a machine learning gradient boosting decision tree GBDT model to obtain a threshold interval of a built environment index xi capable of remarkably improving the activity amount y of the resident park. Aiming at the influence of the built environment around the park on the activity amount of residents, a set of built environment index measurement analysis method for remarkably improving the activity amount of the residents in the park is formed, an influence curve of the built environment around the park on the activity amount of the residents is formed, and an optimization scheme of the optimal built environment around the park is obtained.

The invention discloses an optical fiber laser amplifier with a high non-linear threshold value, the amplifier comprises a laser seed source, a pre-amplification stage, an optical modulator, a main amplification stage and a focusing lens, after the pre-amplification stage improves the optical power of the laser seed source, the optical modulator based on phase modulation is arranged between the pre-amplification stage and the main amplification stage; the wavefront shaping stage is used for carrying out wavefront shaping on the laser output by the pre-amplification stage, and after single-transverse-mode laser is converted into coherent multi-transverse-mode laser, the multi-transverse-mode laser is coupled into a large-mode-field optical fiber of the main amplification stage for power boosting; multi-transverse-mode laser is injected into a fiber core, the phase of each mode of the multi-transverse-mode laser is regulated and controlled through an optical modulator, all the modes meet at the target position of the emergent end of the large-mode-field optical fiber in the main amplification stage, the phase difference is 2kpi (k is an integer), and a focusing lens is used in a combined mode to obtain a focusing light spot with high beam quality. According to the high-power fiber laser, the threshold value of each nonlinear effect in the high-power fiber laser is effectively improved, and high-power and high-beam-quality fiber laser is output.

The present application relates to the technical field of power electronics and smart grid, and provides a micro-grid anti-noise neuromorphic inference control method and system, comprising: obtaining electrical measurement signals of the micro-grid; performing frequency domain attenuation processing on the electrical measurement signals through the inherent filtering characteristics of the equivalent circuit of the neuromorphic computing model to suppress noise interference; adaptively adjusting an event capture threshold according to the environmental noise intensity; capturing event signals from the electrical measurement signals subjected to the frequency domain attenuation processing based on the adjusted event capture threshold; and performing remote information inference based on the event signals and generating control instructions to adjust the operating state of the micro-grid. The present application suppresses noise by using the inherent filtering characteristics of the equivalent circuit, and effectively improves the inference accuracy and robustness of the micro-grid control system in a noisy environment by combining an adaptive threshold adjustment mechanism.

The invention discloses a low-flow-resistance metal wire mesh composite panel aviation linear acoustic liner, which comprises a composite panel, a honeycomb and a bottom plate, and is characterized in that the composite panel is formed by compounding a fine screen mesh, a thick screen mesh and a perforated film; wherein the fine screen mesh provides viscous acoustic resistance and dissipates acoustic energy; the thick silk screen ensures the structural strength of the composite panel and plays a supporting role; the perforated film on the outer surface of the acoustic liner can reduce surface roughness and flow resistance; according to the composite panel, incident sound energy is dissipated into heat energy, the viscous acoustic resistance of the composite panel can be improved, the swept flow acoustic impedance and the sensitivity of the swept flow acoustic impedance along with the change of the swept flow are reduced, the swept flow effect is better inhibited, and the excellent aviation high-speed swept flow linear characteristic is formed. Therefore, according to the low-flow-resistance wire mesh composite panel aviation linear acoustic liner, better noise reduction in a wider flow speed range can be achieved, and meanwhile the flow resistance and the oil consumption rate are reduced.

The invention relates to the technical field of cloud computing, in particular to a platform privatization method and system, and the method comprises the steps: setting an access frequency threshold value; receiving an access request, and sending the corresponding target data to the user according to the access request; counting a time period and periodically counting the user access request quantity; and comparing the user access request quantity with the access frequency threshold value, and determining whether the user access in the statistical time period is abnormal or not according to a comparison result. According to the method, the access frequency threshold is set according to the historical access frequency of the data and is corrected under the abnormal condition, so that the system can dynamically adapt to changes of different data types and user behaviors, the flexibility and the accuracy of access control are improved, a perfect safety protection mechanism is formed by monitoring the access frequency and the access duration, and the safety of the system is improved. Potential security threats can be identified more comprehensively, and risks of data leakage and illegal access are effectively reduced.

The application discloses a gyrotron traveling wave tube interaction system loaded with double-loss material and a design method thereof. The application periodically loads a sheet-shaped mode selection attenuation waveguide in a nonlinear mode selection waveguide to suppress self-oscillation of a main competitive mode. In the case that the total length of the nonlinear mode selection waveguide is unchanged, the introduction of the sheet-shaped mode selection attenuation waveguide can increase the threshold of the starting current of the main competitive mode, so that higher working current can be stably worked, and high-power stable output of the gyrotron traveling wave tube is realized. In the case that the working current is unchanged, the mode selection attenuation waveguide realizes stable work in the case that the nonlinear mode selection waveguide is set, and the efficiency and gain of the beam-wave interaction of the gyrotron traveling wave tube are improved. The application has low sensitivity to the parameters of loss material and has application potential in the engineering implementation of the high average power gyrotron traveling wave tube. The application is simple and easy to implement in engineering, and exhibits excellent performance in the development of the gyrotron traveling wave tube.

The invention discloses an anti-radiation super-junction power MOS device and a preparation method thereof, the device comprises a substrate layer, a buffer layer and an epitaxial layer which are sequentially stacked from bottom to top, a plurality of super-junction columns arranged at intervals are arranged in the epitaxial layer, and a body region is arranged above each super-junction column; a hole doping region and a source doping region which are in contact with each other are arranged in the body region; a gate oxide layer is arranged on the upper surface of the epitaxial layer, and the lower surface of the gate oxide layer is in contact with part of the upper surfaces of the epitaxial layer, the body region and the source doping region; the upper surface of the gate oxide layer is covered with a polycrystalline silicon layer, and the gate oxide layer and the polycrystalline silicon layer form a gate electrode; and an interval doping injection region is also arranged on the epitaxial layer which is not covered by the gate oxide layer between the adjacent body regions. According to the invention, through the interval doping injection region, the hole gathering number below the gate oxide region after particle incidence can be reduced, and the SEGR capability is improved; the current passing through a parasitic transistor base region resistor is reduced, and the threshold value of SEB is improved.

The invention discloses a single-sample wind turbine generator transmission chain fault diagnosis method and system, and belongs to the technical field of data processing. Comprising the following steps: performing empirical mode decomposition on an actual monitoring fault signal to obtain signal components of different modes; and calculating an energy value and a peak value of each modal component, and selecting a part of modal components with large energy and high peak values for signal reconstruction to obtain a new fault signal. Wavelet packet decomposition is carried out on the new fault signal, and signal reconstruction is carried out on a third-layer component of wavelet packet decomposition. And taking the variance of the reconstructed signal as a characteristic value of fault diagnosis. And the characteristic values are subjected to nonlinear equalization processing, so that the problem of mutual flooding of signals is solved. The concept of distinction degree is introduced to quantify the distinction between different fault signals. According to the fault diagnosis method, the distinction degree among the four faults on the transmission chain of the wind turbine generator is obviously increased before and after processing, and the method has high robustness. In actual production, the method is of great significance in reducing troubleshooting time and increasing production efficiency in engineering.

This invention discloses a performance optimization method for a Φ-OTDR and interferometer fusion system based on arithmetic concatenated pseudo-random mapping coding. By constructing a multi-level arithmetic concatenated pseudo-random coding sequence to modulate the transmitted pulses of the Φ-OTDR system, pulse compression is achieved at the receiving end through matched correlation decoding. This compresses the equivalent pulse width to the chip width while maintaining the transmitted power, improving the system's spatial resolution and reducing autocorrelation sidelobes. The cross-phase modulation phase disturbances generated when the coded pulses and continuous light propagate in the same optical fiber exhibit pseudo-random incoherent superposition characteristics during correlation decoding, suppressing nonlinear phase noise in the demodulated output and reducing its impact on the interferometer's continuous light measurement channel. Furthermore, the arithmetic concatenated pseudo-random coding modulation broadens the transmitted spectrum, reduces the optical power spectral density, and increases the stimulated Brillouin scattering threshold, enhancing the system's long-distance transmission capability. This method is suitable for performance optimization of Φ-OTDR and interferometer fusion measurement systems.