43 results about "Thermal relaxation" patented technology

The invention discloses a dry-process high-temperature-resistant lithium battery diaphragm and a preparation method thereof, and relates to the technical field of lithium battery diaphragms. The specific preparation method comprises the following steps: activating and cross-linking polypropylene, polyimide, a PP-b-PI block copolymer and a cross-linking agent BIBP under the protection of nitrogen to prepare a polypropylene-polyimide matrix; after melting, adding a pre-sintered ZrO2-coated Al2O3 core-shell filler, hydroxylated boron nitride and zinc borate, and carrying out double-stage screw extrusion, ultrasonic orientation, nitrogen annealing and cold roller quenching to obtain a mixed melt; carrying out warm stretching and hot air circulation heat treatment to prepare a hard elastic crystal base film; carrying out stretching, thermal relaxation and thermal shaping to obtain a microporous base membrane; after slitting, plasma activation is carried out, epoxy silane and tetraethyl orthosilicate / polybenzimidazole aerogel precursors are sprayed, and a nano closed-pore coating is formed through pre-curing and heat shrinkage curing; and finally eliminating static electricity and rolling to obtain a finished product. The lithium battery diaphragm prepared by the invention is excellent in high temperature resistance and low in thermal shrinkage rate.

The invention relates to the technical field of infrared thermal imaging, in particular to a human body analysis method and system based on an infrared thermal image. The method comprises the following steps: acquiring an infrared thermal image sequence of a limb to be detected in a thermal relaxation process; segmenting the image sequence, constructing a topological center line of an effective contour, and defining a heat flow reference direction based on the geometric width change of a cross section along the center line; a temperature gradient vector field is calculated, and an area with the gradient direction and the heat flow reference direction in reverse distribution and containing a closed isotherm is screened out to serve as a thermal topology abnormal area; establishing a biological heat transfer model taking the surface temperature as a boundary condition, performing inverse solution on the thermal topology abnormal region, and performing inverse calculation on a heat source parameter corresponding to the subcutaneous depth; and when the heat source parameter exceeds a threshold value, generating a damage early warning. According to the method, by quantifying metabolic heat abnormality caused by inflammation in tissues, accurate positioning and quantitative evaluation of deep injury of limbs are realized, and the accuracy of human injury detection is remarkably improved.

The invention discloses a welding seam detection remanufacturing system and device for a hydraulic support, particularly relates to the technical field of mining equipment remanufacturing, and is used for solving the problems of secondary stress migration and base material cracking caused by local heat input during in-situ repair of a box type structural part. A data acquisition module is used for acquiring contour coordinates of a repair area and thickness distribution of base metal; the unit division module divides a stress buffer unit containing a heat input regulation and control subarea based on the thickness gradient and the rib plate layout; the boundary redivision module dynamically optimizes the subarea boundary through geomagnetic field gradient scanning; the heat shock control module executes layered repair welding and activates subarea heat input in sequence; the energy ratio monitoring module switches the activation sub-regions in real time according to the acoustic emission energy ratio to block microscopic plastic deformation; the stress processing module eliminates a migration stress peak value through external expansion area residual stress scanning and local thermal relaxation; the whole-process regulation and control of the stress evolution in the repairing process are realized, and the repairing safety and the service life of the box type structural member are guaranteed under the immovable working condition.

The application discloses a battery thermal runaway early warning method and system, relates to the technical field of battery safety, and uses a current step drop process as a diagnostic excitation. Instead of directly predicting a thermal runaway risk, the application first establishes a normal thermal relaxation baseline and a prediction interval, so as to describe how the temperature should change after the current drops under normal circumstances. Deviation of the actual temperature from the baseline is used as an abnormality judgment basis, so that normal thermal responses and abnormal residuals can be more clearly distinguished. Moreover, the prediction is only performed after the window is valid and decoupling is established, so that the influence of invalid sampling points, cooling disturbances and normal load changes on the prediction result of the model can be reduced. The application further discloses a battery thermal runaway early warning system for implementing the battery thermal runaway early warning method.

This invention discloses a method for controlling the thermal relaxation path of superconducting nanostructures and its application. This method utilizes a van der Waals integration strategy to sequentially fabricate a molybdenum disulfide layer on a silicon / silicon oxide substrate using chemical solution deposition and a niobium nitride superconducting layer using magnetron sputtering, constructing a niobium nitride / molybdenum disulfide heterostructure with intrinsic anisotropic thermal conductivity. Superconducting nanodevices with specific geometric configurations are designed for this heterostructure. Leveraging the ultra-high in-plane thermal conductivity of molybdenum disulfide and its suppressed out-of-plane heat transfer characteristics, the method achieves directional control of the internal thermal relaxation path of the superconducting nanostructure, verifying its dual advantages of optimizing thermal management and enhancing superconducting performance. The control method of this invention is mature and controllable, effectively transforming disordered thermal relaxation into directional heat transfer, significantly improving the thermal stability and integration density of superconducting devices, and providing a core solution for the thermal management of nanocircuits in fields such as superconducting quantum computing and high-sensitivity quantum detection.

This invention relates to the field of industrial Internet of Things (IoT) technology, and particularly to a data fusion decision optimization method, device, and storage medium based on artificial intelligence. The method includes: identifying start-stop events and extracting mechanical impact response windows and thermal relaxation response windows; determining impact characteristic metrics based on vibration signals within the mechanical impact response windows, determining thermal relaxation characteristic metrics based on temperature decay processes within the thermal relaxation response windows, and thus determining the insulation fatigue damage degree; determining a fatigue accumulation index based on the impact characteristic metrics and thermal relaxation characteristic metrics, and thus determining the insulation fatigue damage degree; determining an electrical stress accumulation metric based on stator current harmonic characteristics; determining the health status by comprehensively considering the insulation fatigue damage degree and electrical stress accumulation metric within a management cycle, and providing maintenance prompts. This invention achieves accurate assessment and graded early warning of insulation health status, significantly improving the intelligent level and reliability of motor stator winding operation and maintenance under frequent start-stop conditions.

The application provides a ladle slide plate and a preparation device, and belongs to the technical field of the ladle slide plate, and solves the problems of difficult stress release and easy cracking deformation of the slide plate under high-temperature thermal relaxation cycle. The slide plate comprises a base layer, a symmetric working layer, a peripheral buffer layer and a supporting shell, the buffer layer is composed of an elastic layer and a rigid layer, the two layers are inclined and attached at an angle of 15-30 degrees, a gap is filled with a buffer strip, the elastic layer slips to release force when thermal expansion, and the elastic layer and the buffer strip are reset cooperatively when cooling, and each layer is made of adaptive refractory and heat-resistant steel material. The preparation device is provided with a press with three sets of male and female molds, a matched quantitative powder feeding assembly, a female mold with a built-in graphite lubricant coating structure and a blank body transfer mechanism, and through three-station step pressing, directional powder feeding, interface lubrication preposition and automatic transfer, the slide plate is uniformly formed and integrated. The application improves the anti-thermal deformation cracking capacity of the slide plate, guarantees the forming quality, and is suitable for the harsh service environment of steel smelting.

The application relates to a high-definition flexible optical film and a preparation method thereof. PET master batches, PEN master batches, flexible polyester elastomers and a nano composite dispersion liquid are subjected to melt extrusion, asynchronous bidirectional stretching, in-situ heat relaxation and cooling and winding to obtain the optical film, wherein the nano composite dispersion liquid comprises mCNC, SEBS, SA-BaSO4 and ethylene glycol. The application effectively reduces light scattering and greatly improves high-definition optical performance by using refractive index matched modified nano barium sulfate and highly dispersed modified nano cellulose crystals; the modified nano cellulose crystals improve the high compatibility and thermal stability of the PET base material, so that the PET base material can effectively transfer and disperse stress; SEBS and the composite flexible polyester elastomer synergistically toughen, internal stress is released and a flexible microstructure is constructed by combining the asynchronous stretching and heat relaxation process, so that the film is endowed with super-flexibility; the components have good compatibility, the film size is stable, and there is no rainbow stripe.

This invention relates to the field of infrared thermal imaging technology, specifically to a method and system for human body analysis based on infrared thermal images. The method includes: acquiring a sequence of infrared thermal images of the limb under test during thermal relaxation; segmenting the image sequence and constructing a topological midline of an effective contour, defining a reference direction for heat flow based on the change in cross-sectional geometric width along the midline; calculating the temperature gradient vector field, selecting regions whose gradient direction is inversely distributed to the reference direction of heat flow and containing closed isotherms as thermal topological anomaly regions; establishing a biological heat transfer model with surface temperature as the boundary condition, performing inverse solving on the thermal topological anomaly regions, and calculating the heat source parameters at the corresponding subcutaneous depth; generating a damage warning when the heat source parameters exceed a threshold. This invention, by quantifying metabolic thermal anomalies caused by inflammation within tissues, achieves precise localization and quantitative assessment of deep limb injuries, significantly improving the accuracy of human injury detection.

The invention discloses an on-chip stimulated Raman photo-thermal gas sensing system and method, and particularly relates to the technical field of gas analysis and measurement. Pump light and Stokes light interact with gas to be detected in a sensing waveguide evanescent field area to excite gas molecules to generate a stimulated Raman process and generate local temperature rise through thermal relaxation, so that the refractive index change of the gas is caused, and probe light generates a phase modulation signal related to the refractive index change. Phase modulation signals and background phase disturbance related to the gas photothermal effect are distinguished and differentiated, so that phase background noise is suppressed, and the signal-to-noise ratio and sensitivity of gas measurement are improved. Functional units such as the laser, the sensing waveguide and the detector are integrated into a single chip to form a gas measurement system which is compact in structure, low in power consumption and high in anti-noise capability, and the problems of weak signal, high background noise and low integration level in traditional waveguide Raman gas measurement are effectively solved.

The present application discloses a method for measuring the dynamic thermal expansion properties of a nanofilm, which relates to the field of measurement technology. The method is applied to an ellipsometer provided with a temperature-controlled hot stage. The method comprises: controlling the temperature of a thin film sample on the hot stage according to a resonant temperature modulation program, and obtaining a thickness-time curve of the thin film using the ellipsometer; based on the obtained thickness-time curve, determining the amplitude and phase of the resonant dynamic change of the film thickness in response to the temperature modulation program using a digital signal processing method, and obtaining an amplitude-time curve and a phase-time curve; and then determining the apparent thermal expansion coefficient, reversible thermal expansion coefficient, and irreversible thermal expansion coefficient of the thin film sample; the present application measures the thermal expansion behavior of the thin film sample by setting a temperature modulation program, thereby accurately determining the reversible thermal expansion coefficient and its real and imaginary parts, as well as the irreversible thermal expansion coefficient of the thin film sample, thereby accurately reflecting the molecular motion and thermal relaxation behavior of the nanofilm.

This invention relates to the field of composite piezoelectric materials, and more particularly to a polyacrylonitrile fiber composite piezoelectric material and its preparation method. The preparation method provided by this invention first utilizes a coating method to prepare a composite fiber membrane. The interfacial interaction—microphase synergy effect—formed by the coating between the EP matrix and the piezoelectric active layer effectively suppresses the random entanglement and thermal relaxation of the molecular chains in the piezoelectric active layer. Subsequently, corona polarization is used to induce the molecular chains of the piezoelectric active layer to oriented along the electric field direction, which can significantly increase the proportion of the planar serrated conformation of the piezoelectric active layer. This preparation method has strong process compatibility, controllable preparation cost, and is suitable for large-scale industrial production. The prepared composite piezoelectric material does not require complex multilayer structures or additional doping modifications to achieve directional improvement and long-term stability of the piezoelectric coefficient, and has excellent reusability, which is expected to meet the needs of diverse application scenarios.

The invention relates to the field of laser processing, and discloses a laser beam processing treatment process for the surface of a steel bridge component, which comprises the following steps: a laser beam deflection unit drives a laser beam to carry out area scanning on the surface of the component, and a photoelectric sensing unit is used for collecting a reflection intensity signal; the control unit extracts a signal amplitude mean value to construct a feature sequence and compares the feature sequence with an oxidation judgment benchmark; and when the amplitude is in a switching interval, bidirectional scanning is switched into unidirectional intermittent scanning by modulating a galvanometer motor driving signal, and a thermal relaxation gap is constructed by using a motor commutation dead zone so as to synchronously block laser energy. Transient heat at the edge of a processing area is effectively induced to diffuse, the interface peak temperature is maintained below the oxidation critical point of a base body, and the problems of base material ablation and oxidation caused by light spot reversing staying are solved on the basis of guaranteeing pollutant stripping.

The invention relates to a high-definition flexible optical film and a preparation method thereof, the high-definition flexible optical film is prepared by melt extrusion, asynchronous two-way stretching, in-situ thermal relaxation, cooling and rolling of raw materials of PET master batch, PEN master batch, flexible polyester elastomer and nano composite dispersion liquid, and the nano composite dispersion liquid comprises mCNC, SEBS, SA-BaSO4 and ethylene glycol. By using the modified nano barium sulfate with matched refractive index and the highly dispersed modified nano cellulose crystal, the light scattering is effectively reduced, and the high-definition optical performance is greatly improved; the modified nano cellulose crystal improves the high compatibility and thermal stability with a PET base material, so that the modified nano cellulose crystal can effectively transfer and disperse stress; sEBS and the composite flexible polyester elastomer are synergistically toughened, and asynchronous stretching and thermal relaxation processes are combined to release internal stress and construct a flexible microstructure, so that the film is endowed with a super-soft characteristic; all the components are good in compatibility, and the film is stable in size and free of rainbow lines.

The present invention aims to provide a method for producing a polyester film capable of further suppressing uneven thickness of a functional layer provided on the surface of the polyester film, as well as a polyester film and a laminated film capable of further suppressing uneven thickness of a functional layer provided on the surface. The method for producing a polyester film of the present invention comprises: an extrusion molding step of extruding a molten resin containing polyester into a film shape to form an unstretched polyester film; a longitudinal stretching step of stretching the unstretched polyester film in a conveying direction; a transverse stretching step of stretching a uniaxially oriented polyester film in a widthwise direction; a heat setting step of heating and heat setting the biaxially oriented polyester film; a heat relaxation step of heating and heat relaxing the heat-set polyester film at a temperature lower than that in the heat setting step; a cooling step of cooling the heat-relaxed polyester film; an expansion step of expanding the heat-relaxed polyester film in the widthwise direction during the cooling step; and a particle-containing layer forming step of providing a particle-containing layer containing particles on at least one surface of a polyester substrate, wherein the cooling rate V of the polyester film in the cooling step is 2200 to 3500°C / min and the following specific condition 1 is satisfied.

The utility model provides a laminated solar cell, a photovoltaic module, a power utilization device and a power generation device.The laminated solar cell comprises a top cell and a bottom cell which are arranged in a laminated mode in the first direction, and the top cell comprises a first electrode, a first light absorption layer and a second electrode which are sequentially arranged in a laminated mode in the first direction; the bottom cell comprises a third electrode, a second light absorption layer, a composite layer, a third light absorption layer and a fourth electrode which are sequentially stacked in the first direction, and band gaps of the first light absorption layer, the second light absorption layer and the third light absorption layer are sequentially reduced. According to the laminated solar cell, thermal relaxation of the solar cell can be reduced, photoelectric utilization efficiency of the solar cell is improved, and preparation of a composite layer can be reduced.

The invention, which relates to the technical field of flight path prediction and control, discloses a power transmission line-oriented guide and ground wire edge end dynamic fitting line-imitating flight system, the system firstly fuses an inspection basic data set, and creatively constructs multi-dimensional asymmetric risk characteristics such as thermal relaxation and line spacing deviation around the physical characteristic difference of a guide and ground wire; thirdly, constructing a risk level prediction model to perform time sequence modeling on the risk features so as to predict a flight risk score value in a future time period; then, a dynamic three-dimensional risk map is generated based on a prediction result, and preliminary path planning is guided; and finally, through path margin conformity evaluation and iterative correction of a closed loop, resolving and ensuring that the minimum clearance distance between the final path and the dynamic no-fly envelope meets the safety requirement. According to the invention, the technical problem that the traditional line-imitating flight is difficult to deal with the dynamic concealment risk of the lead is solved, and the safety, autonomy and environmental adaptability of the inspection flight are improved.

The invention relates to the technical field of fiber preparation, and discloses a production method for efficiently preparing flame-retardant monofilaments, which comprises the following steps: performing surface activation on a polyamide matrix through radio frequency plasma, and directionally introducing carboxyl functional groups; carrying out surface grafting modification on the composite flame-retardant master batch by adopting a silane coupling agent to construct an interface transition layer; the water content of the raw materials is regulated and controlled through a microwave-airflow combined drying system; gradient distribution of the flame retardant is realized by adopting a double-channel spinning assembly; the preparation method comprises the following steps: synergistically dispersing a nano reinforced phase and a flame retardant to construct a three-dimensional network structure, and forming primary monofilaments through a spinning assembly; the crystal structure is regulated and controlled through two-stage stretching of wetting pre-orientation and dry heat main orientation; and the fiber structure is stabilized by adopting a segmented temperature-control thermal relaxation process, so that a monofilament finished product with flame retardance is prepared. By means of the synergistic effect of plasma activation, gradient spinning and staged orientation, efficient and continuous production of the flame-retardant monofilaments is achieved.

This invention relates to the field of fiber optic temperature measurement technology, specifically to a high-temperature sensor based on a torsion-type long-period fiber grating and its fabrication method. The fabrication process includes: fixing an optical fiber to a rotating fixture and rotating it by a preset angle to prepare an optical fiber with a preset torsional stress field; controlling a laser and a displacement platform to alternately perform fixed-point pulse irradiation and step-by-step movement to induce thermal relaxation of the stress field to prepare the grating; collecting transmission spectral data and controlling the processing equipment based on power loss values; and calculating the temperature sensitivity coefficient. In this invention, by pre-setting a torsional stress field and inducing periodic thermal relaxation of stress, dependence on photosensitive doping materials is eliminated, mechanical strength is maintained, and efficient refractive index modulation is achieved, resulting in excellent thermal stability. Combined with real-time spectral acquisition and loss analysis, a closed-loop feedback is constructed to precisely adjust irradiation parameters, improving temperature sensitivity and linearity, and solving the problems of low yield and poor long-term stability associated with traditional processes.

A method and device for measuring subcutaneous blood vessel parameters, wherein the measuring method includes irradiating the epidermis of the skin with multiple lasers of different pulse widths and simultaneously collecting temperature signals from the skin surface. A temperature distribution curve is drawn under each of the pulse width laser irradiations. Temperature peaks will appear on the temperature distribution curve. After the number of temperature peaks stabilizes, a stable temperature peak is obtained. The number of stable temperature peaks is the number of blood vessels, and the depth corresponding to the stable temperature peak is the depth of the center of the blood vessel. Furthermore, by obtaining and fitting different temperature peak information under different pulse width laser irradiations at the same depth, a fitting relationship is obtained; and then the diameter of the blood vessel is calculated based on the principle and definition of thermal relaxation. The measuring device includes a power supply, a display screen, a laser emitting component, a temperature collection component, and a control component. The control component is electrically connected to the power supply, the display screen, the laser emitting component, and the temperature collection component, and the control component controls the operation of the measuring device.

This invention relates to the field of laser surface engineering technology, specifically to a laser irradiation-induced coating cracking device and method. The device includes a laser generation and output unit, a beam transmission and dynamic focusing unit, an online monitoring and feedback unit, and a central control unit. In this invention, by collecting crack morphology data and thermophysical parameters of the coating surface, a repair mode or a prevention mode is intelligently switched. In repair mode, the beam is controlled to perform low-power defocus scanning along both sides of the crack to construct a preheating relaxation zone, followed by high-power focusing scanning along the crack center to induce dense remelting. In prevention mode, a grid-like laser shock treatment is performed to construct a compressive stress layer. By utilizing infrared and visual dual feedback to correct the laser output energy in real time, active control of coating stress and non-destructive healing of defects are achieved, solving the problem of coating peeling and thermal damage easily caused by traditional thermal repair, and improving the structural integrity and service life of precision coated components.

The invention relates to the technical field of non-ferrous metal hydrometallurgy, and discloses a multi-layer film-coated fully-sealed anode and a manufacturing method thereof, and the multi-layer film-coated fully-sealed anode comprises an anode diaphragm frame, an anode matrix fixed in the frame, a multi-layer composite film assembly coating the outer side of the matrix, a sealing fastener and a fluid pipeline interface. And the sealing fastener penetrates through the edge of the anode diaphragm frame to press and fix the multi-layer composite membrane assembly on the plane sealing combination surface of the frame, so that a physically fully-sealed anode chamber is constructed. The multi-layer composite membrane assembly is sequentially provided with a runner supporting layer, a main isolating layer, a buffer layer, a chemical protective layer and a physical protective layer from inside to outside. The thermal relaxation effect of the engineering plastic and the film material is eliminated by using a thermal state fastening process, and the sealing stability in a high-temperature acid environment is ensured; a one-way permeation mechanism from catholyte to an anode chamber is established by controlling the liquid level difference of the two sides of the membrane, and anode products are physically prevented from diffusing outwards in cooperation with a micro-negative-pressure exhaust and independent circulation system.

The invention relates to a device and a method for simultaneously realizing anti-adhesion and high-conductivity carbon nanofiber preparation, and belongs to the technical field of carbon nanofiber preparation. The invention aims to overcome the defects of the existing carbon nanofiber pre-oxidation technology, and firstly, the problem of interlayer adhesion caused by melting in the heat treatment process of a fiber membrane is solved; and secondly, the problem of low conductivity of the final carbon fiber product caused by shrinkage and disorientation of the fiber due to thermal relaxation in the traditional static pre-oxidation process is solved. In order to solve the problems, the invention aims to provide a method and a device capable of synchronously realizing anti-adhesion and high-orientation pre-oxidation so as to prepare high-conductivity carbon nanofibers.

This invention provides a method for preparing PVDF-based piezoelectric products using a micro-injection molding process based on anti-chain relaxation. The method involves melt-blending 94–98.5 parts by weight of PVDF, 1–5 parts by weight of ionic liquid, and 0.5–1 parts by weight of one-dimensional / two-dimensional carbon-based conductive filler to obtain a polyvinylidene fluoride composite material. This material is then injected into a mold for the desired piezoelectric product using a micro-injection molding machine, resulting in the PVDF-based piezoelectric product. This method utilizes the strong shear field involved in the micro-injection molding process to promote the orientation of PVDF molecular chains. Combined with the introduction of ionic liquid to induce the formation of polar crystals in the PVDF piezoelectric material and suppress the local thermal relaxation behavior of the PVDF molecular chains, this significantly reduces PVDF chain relaxation, facilitating the formation of a highly oriented β-polar phase and substantially improving the piezoelectric performance of PVDF-based piezoelectric devices.

The application discloses a weld seam detection remanufacturing system and device for hydraulic support, and particularly relates to the field of remanufacturing technology of mining equipment, and is used for solving the secondary stress migration and base metal cracking problems caused by local heat input during in-situ repair of box-shaped structural parts; the data acquisition module is used for collecting the repair area contour coordinates and the base metal thickness distribution; the unit division module is used for dividing the stress buffer unit containing the heat input control sub-area based on the thickness gradient and the rib plate layout; the boundary redivision module is used for dynamically optimizing the sub-area boundary through the geomagnetic field gradient scanning; the thermal excitation control module is used for performing layered repair welding and sequentially activating the sub-area heat input; the energy ratio monitoring module is used for switching and activating the sub-area in real time according to the acoustic emission energy ratio to block the microscopic plastic deformation; the stress processing module is used for eliminating the migration stress peak value through the residual stress scanning of the expanded area and the local thermal relaxation; the whole process regulation of the stress evolution during the repair process is realized, and the repair safety and service life of the box-shaped structural parts are ensured under the unmovable working condition.

The invention relates to a stretching method for hollow two-component fiber production, which comprises the following steps of: preheating and relaxing treatment: preheating and relaxing hollow two-component fiber pre-oriented yarns subjected to spinning and preliminary cooling and curing at a first temperature T1; the first temperature T1 is higher than the glass transition temperature Tg of the two polymer components in the fiber, but lower than the lower crystallization temperature Tc of the two polymer components; two-stage progressive stretching: first-stage stretching: carrying out first-stage stretching at a second temperature T2 at a stretching rate lambda1; second-stage stretching: immediately carrying out second-stage stretching at a third temperature T3 at the total stretching rate lambda; the fibers stretched in the step S2 are subjected to heat setting treatment at the fourth temperature T4, the fourth temperature T4 is higher than the third temperature T3, and the fourth temperature T4 is lower than the low melting point temperature Tm in the two polymer components; and cooling and winding. According to the invention, a hollow structure can be stably maintained, good combination of two-component interfaces is promoted, and collaborative optimization of fiber performance is realized.

The invention relates to the technical field of rail transit overhead line system detection, and discloses an overhead line system fluorescent fingerprint damage diagnosis method which comprises the following steps: forming a multi-mode excitation field by adjusting the energy density of a pulse laser beam and switching an excitation light path; collecting a contact net wearing surface fluorescence signal and constructing an intrinsic fluorescence signal matrix; calculating a geometric chemical coupling index and a rotation correlation time constant, and constructing a three-dimensional state characteristic vector; and determining a damage type based on a falling area of the three-dimensional state feature vector in the diagnosis feature space. According to the method, the geometric chemical coupling index is obtained through a double-angle power modulation differential excitation mechanism, and decoupling of macroscopic morphology damage and microscopic material attribute degradation is achieved; the microcosmic lattice binding capacity is quantified through rotation related time constants, and lattice thermal relaxation and non-crystallization phase change damage are recognized; interference is eliminated by using the difference between the metal oxide and the organic pollutant in nonlinear response characteristics, and the contact network damage diagnosis precision in a complex environment is improved.

This invention relates to the field of acoustic wave modulation, and proposes a thermoacoustic signal modulation system and method, including a thermoacoustic modulation device and a closed-loop feedback control circuit. The thermoacoustic modulation device includes a medium for propagating sound waves and a thermal modulation unit integrated on or near it. The thermal modulation unit has temperature-sensitive electrical characteristics, and its electrical parameters are functionally related to temperature. The closed-loop feedback control circuit is electrically connected to the thermal modulation unit, determines the current temperature state based on the real-time electrical parameters of the thermal modulation unit, and generates driving power applied to the thermal modulation unit when there is a deviation between the target control signal and the current temperature state. The closed-loop feedback control circuit applies transient overdrive power to the thermal modulation unit when the temperature deviates passively or actively from the target temperature, so as to quickly reach and lock the target temperature. This transforms temperature modulation from passive thermal relaxation to active control based on electrical feedback.

The present application relates to the technical field of nylon fiber, and more particularly to an antibacterial and flame-retardant nylon fiber and a preparation method thereof, comprising the following steps: S1, in-situ polymerization modification of nylon chip with phosphorus-nitrogen functional monomer; S2, in-situ construction of copper ion coordination and antibacterial functional layer; S3, surface grafting and thermal crosslinking of the dense crosslinked flame-retardant antibacterial layer of the skin layer; and S4, thermal relaxation and functional activation. The present application realizes chemical bonding and coupling of the antibacterial function and the flame-retardant function at the molecular level through the composite technology of in-situ polymerization covalent grafting, copper-phosphorus-nitrogen ternary coordination chelation and three-dimensional thermal crosslinking of the surface layer, and discards the traditional modification mode of physical blending and simple superposition. Meanwhile, the copper ion can catalyze the phosphorus-nitrogen system to form carbon at high temperature, so that the residual carbon rate is improved, the positive synergy of antibacterial without weakening flame retardant and flame retardant without inhibiting antibacterial is realized, and the core problem of mutual interference and low effect of the existing antibacterial and flame-retardant nylon fiber is solved.

The invention discloses a preparation device of a high-imitation cotton textile fiber fabric, and relates to the technical field of textile machinery, the preparation device comprises a POY precursor supply device and an FDY precursor supply device which are arranged on the same spindle position, and a hot box comprises a first hot cavity, a second hot cavity and a third hot cavity which are sequentially arranged from top to bottom; the first heat cavity is configured to allow POY to penetrate through, and a heating plate is rotationally arranged in the first heat cavity. According to the preparation device of the high-imitation cotton textile fiber fabric, triple temperature gradients are achieved through a single heat source, POY filaments are fully heat-set in the first heat cavity of the high-temperature area, FDY filaments are gradually heat-relaxed in the second heat cavity and the third heat cavity of the medium-low-temperature area, and the technical problem that the heat treatment requirements of the POY filaments and the FDY filaments are greatly different is solved. Moreover, the internal stress of the FDY which is gradually loosened is basically eliminated, reliable skeleton support and strength are provided for the yarn, and the POY which is violently deformed at high temperature is easier to fluffy in subsequent heat treatment.