12results about How to "Improve distortion" patented technology

This invention discloses an intelligent exercise assessment and early warning system based on multi-source biosignal fusion, belonging to the field of exercise risk early warning technology. It collects multi-source data, including electromyography (EMG), heart rate, blood oxygen, skin conductance, and acceleration, from various wearable sensors to assess muscle fatigue, cardiovascular load, exercise status, and environmental factors. After preprocessing, the system uses quantitative models such as the muscle fatigue correction index and the cardiovascular load dynamic coefficient to calculate a comprehensive exercise risk early warning index by integrating physiological state and environmental factors. This results in a normalized risk classification, corresponding to low, medium, and high risk levels and marked with different color icons. This system overcomes the limitations of single signals, considering the synergistic effects of multi-dimensional physiological indicators and the influence of environmental factors, improving the accuracy of assessment in complex scenarios. It can effectively intervene before risks develop and is suitable for scenarios such as mass fitness and professional training. It is integrated into lightweight wearable devices without interfering with the exercise process.

The invention discloses a flexible methanol fuel cell and a humanoid robot power supply system, and relates to the technical field of methanol power generation, the flexible methanol fuel cell comprises a flexible bag body, the two ends of the flexible bag body are provided with a liquid inlet and a liquid outlet, and the side surface is provided with a mounting opening; the membrane electrode is sealed in the mounting opening; the anode diffusion layer and the cathode diffusion layer are respectively fixed on the anode side and the cathode side of the membrane electrode, and fine wire meshes are fixed on the anode diffusion layer and the cathode diffusion layer. A humanoid robot power supply system comprises a flexible methanol fuel cell, a DMFC energy management system and an energy storage cell, and the flexible methanol fuel cell serves as a power generation unit and is integrally distributed on the outer surface of a robot. According to the flexible methanol fuel cell disclosed by the invention, the whole cell body has good bending, twisting and tensile elasticity, can adapt to various irregular surfaces and dynamic deformation scenes, and is light in weight and thin in thickness. The flexible methanol fuel cell is used as a power generation skin to be integrated on the robot, the mass energy density is improved, and the endurance working time is prolonged.

The invention relates to the technical field of ultrasonic emission, and particularly provides an arbitrary waveform ultrasonic generation method for demodulating a pulse width modulation signal by using frequency response characteristics of a transducer. The method comprises the following steps: acquiring frequency response characteristic data of a target ultrasonic transducer; calculating a modulation function for modulating the duty ratio of the pulse width modulation signal; generating a high-voltage pulse width modulation signal sequence; directly driving the target ultrasonic transducer by the high-voltage pulse width modulation signal sequence, and filtering and demodulating the high-voltage pulse width modulation signal sequence by using the frequency response characteristic of a mechanical vibration system of the target ultrasonic transducer as a natural low-pass filter, and generating an ultrasonic wave corresponding to the target ultrasonic waveform. According to the invention, the fundamental simplification of the system structure is realized, high-fidelity arbitrary waveform ultrasonic output is obtained on the basis of keeping high-efficiency switch driving, and the system has excellent waveform flexibility and adaptive capacity to transducer characteristics.

The invention relates to the technical field of electric field processing and freezing preservation, and discloses an electric field generator for improving the uniformity of a space electric field and an aquatic product freezing method.The electric field generator for improving the uniformity of the space electric field comprises an electric field generating structure which defines at least one working plane, a working area is formed between the two groups of electric field generating structures; the functional structures are symmetrically arranged on one of the electric field generating structures, and each functional structure is provided with a circuitous part which extends towards the working area; according to the electric field generator, by introducing a flat-curved composite structure design into the discharge plate, potential distribution is optimized, the uniformity of a space direct-current electric field is remarkably improved, the fringe electric field concentration effect is reduced, the electric field generator can form a stable and uniform potential field in the electric field auxiliary freezing process, uniform nucleation is promoted, ice crystals are refined, protein structure denaturation is reduced, and the freezing efficiency is improved. Therefore, the quality of frozen samples is improved.

This invention discloses a method for suppressing current imbalance and power oscillations based on a virtual synchronous generator (VSG). First, a traditional VSG loop model is established and its parameters are tuned. Then, the positive and negative sequence components of the grid-connected voltage, filter capacitor terminal voltage, and grid-connected current are extracted using a time-delay cancellation method and transformed to a synchronous rotating coordinate system. An equivalent VSG grid-connected loop model is added to the traditional VSG model. The traditional active power and extended reactive power calculation methods are transformed to the synchronous rotating coordinate system, and a reference value for the grid-connected current that suppresses the second harmonic component of the power is derived. A PI controller is used to make the actual grid-connected current track the reference value, and the output modulated wave drives the inverter. This invention can simultaneously suppress the second harmonic oscillations of active and reactive power, improve grid-connected current imbalance and distortion problems, while retaining the active power frequency regulation, reactive power voltage regulation, and inertial support characteristics of the VSG, thus improving the stability and power quality of the new energy grid-connected system.

The invention provides austenitic stainless steel as well as a preparation method and application thereof, and relates to the field of high-temperature-resistant austenitic stainless steel. The austenitic stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.10% of C, less than or equal to 0.12% of N, less than or equal to 2.0% of Si, 1.0-2.0% of Mn, 16.0-18.0% of Cr, 10.0-14.0% of Ni, 2.0-3.0% of Mo, 0.05-0.10% of Nb, 0.05-0.10% of Ti, less than or equal to 0.02% of S, 0.04-0.06% of P and the balance of Fe and inevitable residual elements. The content of P in the stainless steel is increased, the diffusion rate of solute atoms such as Cr and Mo can be reduced through interaction of P and vacancies at the high temperature, nucleation of M23C6 carbides and the like at the grain boundary is inhibited, the precipitation number is remarkably reduced, meanwhile, P is discharged outwards in the coarsening process of the M23C6 carbides, a core-shell result that the M23C6 carbides are wrapped by the P element is formed, the coarsening rate of the M23C6 carbides is reduced, and the corrosion resistance of the stainless steel is improved. Furthermore, a creep cavity caused by a precipitated phase in the creep process is inhibited, and the creep fracture strength is improved.

The invention relates to the technical field of alloy coatings, in particular to an in-situ TiC reinforced AlCoCrFeNiMo high-entropy alloy laser cladding coating and a preparation method thereof.The preparation method comprises the steps that S1, mixed metal powder, Ti powder, graphite powder and modified powder are added into a ball milling tank and subjected to ball milling under argon protection; s2, the surface of the base material is polished with abrasive paper, an interface bonding modifier is sprayed after ultrasonic cleaning, and a pretreated base material is obtained; and S3, cladding a coating on the surface of the base material by using DML2000 laser cladding equipment, and cooling to room temperature along with the furnace after cladding is completed. According to the method, through the in-situ reaction of Ti and C in the laser cladding process, a TiC reinforced phase is generated in an AlCoCrFeNiMo high-entropy alloy matrix, the problems of uneven distribution, poor interface bonding and the like caused by direct addition of TiC are avoided, and the bonding strength of the reinforced phase and the matrix is improved. And due to introduction of TiC, crystal grains are refined, lattice distortion is increased, and therefore the comprehensive performance of the coating is improved.

This invention proposes a gallium nitride-based semiconductor laser, comprising, from bottom to top, a substrate, a lower confinement layer, a lower waveguide layer, an active layer, an upper waveguide layer, and an upper confinement layer. This invention incorporates a multi-layered, multi-vacancy electron-phonon modulation layer within the semiconductor laser element, defining the electron affinity distribution and polarization optical phonon energy distribution characteristics of each multi-vacancy electron-phonon modulation layer. This forms single-vacancy, vacancy cluster, and multi-vacancy modulated electron-phonon structures, localizing electron-phonons between the lower confinement layer and the lower waveguide layer. This reduces the Stokes shift caused by the photon energy difference between the pump light and the oscillating light, reduces heat loss from phonon vibration and phonon transport, improves the heat dissipation of the laser element, mitigates interlayer thermal mismatch, suppresses the thermal lensing effect and stress birefringence effect of the laser, improves laser beam distortion and depolarization, and enhances the laser beam quality factor.

The application provides a photoelectric detection circuit and a display device. The photoelectric detection circuit is provided with an auxiliary light sensing transistor in the same light environment condition as a main light sensing transistor. The threshold voltage of the auxiliary light sensing transistor is captured and compensated to the gate of the main light sensing transistor through a first threshold capturing compensation unit. Thus, the influence of the threshold voltage offset of the main light sensing transistor on the photoelectric signal generated by the main light sensing transistor is reduced, the photoelectric signal output by the main light sensing transistor due to characteristic drift is improved, and the detection precision of the photoelectric detection circuit is improved.

The curved-swept blade design method comprises the following steps that a blade in the area above the gravity center of a blade tenon rotates around the axis of an engine, the blade in the area from the gravity center of the tenon to 30% of the blade height position rotates around the axis of the engine to the blade back direction, and the blade in the area above the gravity center of the tenon to the blade back direction; and an included angle is formed between the element-level gravity center of the runner hub and the connecting line of the axis of the engine and the gravity center of the blade tenon. The invention further provides a swept-curved blade. According to the method and the swept-curved blade, smooth transition between the root end area and the middle upper part of the blade can be achieved, the problem of stress concentration is avoided, and smooth transition from the end area in the blade runner to the tenon is achieved.

The invention provides a new energy truck receipt and track fusion acquisition method and system, and relates to the technical field of data processing. The method comprises the following steps: identifying a vehicle target state and determining a target analysis section by acquiring vehicle CAN speed data, GNSS positioning time sequence data and transportation business document data; determining a document constraint window in combination with document data, and taking an intersection with the target analysis section as a candidate analysis section; recognizing a GNSS and CAN static and dynamic conflict section based on a GNSS data time sequence and speed characteristics, calculating a compensation confidence index reflecting a data distortion degree, and judging and determining a section to be compensated according to the compensation confidence index; and finally, implementing business constraint on the mileage compensation amount according to the receipt data, correcting the track mileage data and outputting a fusion acquisition result. The track mileage is subjected to credible correction under the document constraint, so that the authenticity and the traceability of the track data in the transportation business scene can be improved.

The application discloses an image processing method and an image processing device, and belongs to the technical field of image processing. The image processing method comprises the following steps: performing DCT transformation on an original image, and determining a DCT subband similarity table and a code rate lookup table; determining a first population and a second population based on a default quantization table and a quantization factor; performing cross variation processing on the first population and the second population based on a target cross variation operator, obtaining a first offspring individual corresponding to the first population and a second offspring individual corresponding to the second population; evaluating the fitness values of the first offspring individual and the second offspring individual based on the DCT subband similarity table and the code rate lookup table, performing environment selection processing according to the obtained fitness values, and determining a final quantization table; and compressing the original image based on the final quantization table, and determining a compressed code stream corresponding to the original image. The method of the application can make the compressed image have a relatively uniform code rate distribution and a relatively high image quality.