285 results about "Magnetic response" patented technology

The invention provides a double-source magnetic field comprehensive detection and analysis method and system based on a buried metal pipeline, and the method comprises the following steps: applying composite magnetic field excitation to a target section of the pipeline, and synchronously collecting mixed magnetic response signals through a magnetic sensor array disposed along the axial direction of the pipeline. The mixed signal is separated into a slowly varying component representing quasi-static background stress and a burst component representing a pipeline stress event, and the burst component is extracted. And carrying out dispersion elimination inverse operation processing on the extracted burst component, and accurately determining the position information of the pipeline stress event on the pipeline through joint optimization solution by combining the time difference of arrival and the energy attenuation of the original waveform characteristics on different sensors. And inputting energy and position information of a pipeline stress event into the model, and continuously calculating and updating an accumulated damage factor of a specific position of the pipeline. According to the invention, the stress event of the buried metal pipeline can be accurately identified and positioned.

Microparticles for detecting biological materials are provided. Each of the microparticles includes: a core-shell structured microparticle consisting of a core including a magnetically responsive metal and a shell layer surrounding the core and having a uniform thickness; and capture probes introduced onto the shell layer to capture biological materials.

The invention provides a butt joint device based on electromagnetic connection and an underwater navigation device, and relates to the technical field of underwater vehicles, the butt joint device comprises a first butt joint assembly and a second butt joint assembly, the first butt joint assembly comprises a first nut and a magnetic driving part arranged on the first nut in a sleeving mode, the second butt joint assembly comprises a telescopic rod, a connecting rod, a second nut and a magnetic response part, one end of the connecting rod is connected with the telescopic end of the telescopic rod, the other end is in threaded connection with the second nut, and the magnetic response part sleeves the periphery of the second nut. The magnetic driving part is used for attracting the magnetic response part to preliminarily butt the first butt joint assembly and the second butt joint assembly, the fixed end of the telescopic rod is driven to rotate to drive the connecting rod to rotate, and the connecting rod rotates and moves in the axial direction of the second nut to be in threaded connection with the inner wall of the first nut so as to secondarily butt the first butt joint assembly and the second butt joint assembly. Radial and axial wandering is eliminated, the stability and anti-disturbance capability after butt joint are enhanced, and the overall operation quality and efficiency are improved.

The invention provides an on-line intelligent monitoring system based on a coil, and relates to the technical field of data processing, and the system is used for calculating the comprehensive coupling degree between coil magnetic field change and current response according to monitoring data, obtaining a magnetic response correlation value, constructing a distribution matrix of coil magnetic field distribution characteristics, obtaining a coil local coupling map, and obtaining a current response correlation value. The method comprises the following steps: calculating the influence degree of temperature change on magnetic flux energy offset, obtaining a temperature drift correction value, identifying the relative offset trend of electromagnetic response and energy compensation, obtaining a phase offset, calculating the response self-stabilization degree of a coil in long-term operation, obtaining a dynamic balance factor, and identifying the dynamic characteristics of the coil in electromagnetic, temperature and space response dimensions. And judging whether the coil is in a response instability state or a normal operation state to obtain monitoring state result data. The state of the coil is monitored by identifying coupling characteristics of electrical parameters and temperature of the coil.

The invention discloses an inorganic normal-temperature rapid-hardening coal-rock mass reinforcing and filling material, and relates to the technical field of mine reinforcement. The material comprises a liquid A and a liquid B, the liquid A is prepared from cement, fly ash, magnetic nano silicon dioxide, citric acid and a layered bimetal oxide-sodium hexametaphosphate compound; and the liquid B comprises water glass, superfine limestone and water. During use, the liquid A and the liquid B are mixed according to the volume ratio of 1: 1 and injected into a target area, and a 1.5 Tesla magnetic field is applied at the initial stage of grouting until the grout is initially set. Through the synergistic effect of the compound protection dispersing agent, the magnetic particles and an external magnetic field, the technical problems that an existing material is unstable in performance due to temperature change, nanoparticles are prone to agglomeration, and magnetic response is attenuated in an alkaline environment are effectively solved; the technical effects of rapid solidification, high strength and excellent durability in high-temperature, low-temperature and complex mine environments are achieved.

Magnetic-responsive compositions for roofing materials are provided. A composition comprises a polymer and a magnetic-responsive additive. The magnetic-responsive additive, when subjected to a magnetic field, is aligned in a horizontal direction sufficient to increase a reflectivity of the composition upon curing to form a roofing material. A kit comprising a composition and a roller device is provided. The roller device comprising a roller, wherein the roller contains a magnetic array. Related systems and related methods are also provided.

The invention discloses an overlying strata fracture electromagnetic imaging method and a grouting system, and particularly relates to the technical field of geological fracture imaging. The invention discloses an overlying strata fissure electromagnetic imaging method and a grouting system. The method comprises the steps that S1, magnetic source slurry containing permanent magnetic material particles is injected into a target overlying strata fissure area through the grouting system; s2, magnetizing the magnetic source slurry injected into the crack through an electromagnetic coil group arranged on the grouting system; s3, tracer slurry containing magnetic responsive nanoparticles is injected into the fissure area where the guiding magnetic field is formed through a grouting system; s4, in-hole electromagnetic detection equipment is adopted to scan the fracture area filled with the tracing slurry, and electromagnetic response data are obtained; and S5, processing and analyzing the electromagnetic response data. According to the overlying strata fissure electromagnetic imaging method and the grouting system provided by the invention, through a technical path of'pilot magnetism and post tracing ', the tracing slurry is actively guided to directionally migrate by utilizing the magnetic field, and high-precision filling and electromagnetic imaging of an overlying strata fissure network are realized.

The invention relates to the technical field of preparation of high polymer materials and intelligent response materials, in particular to a preparation method of polyacrylamide for treatment. And constructing a quaternary polymerization system with acrylamide, a temperature-sensitive monomer and a zirconium-based metal organic framework-graphene quantum dot composite material. Magnetic response interpenetrating network gel is formed by induction of a photo-magnetic synergistic field, bacterial cellulose nanofibrils and a calcium silicate layered structure are introduced through a biomimetic mineralization technology, and the hierarchical porous carrier is prepared by combining a microfluidic crushing technology and a supercritical drying technology. Finally, through an intelligent regeneration mechanism of bimetal coordination activation and high-frequency magnetic field triggering, the material is endowed with multiple stimulation response characteristics, high adsorption capacity and in-situ regeneration capacity, and the mechanical strength and the salt resistance are remarkably improved through a pearl-layer-like micro-nano laminated structure. The method is suitable for industrial wastewater advanced treatment and emergency pollution repair scenes.

The invention discloses a Tokamak plasma magnetic response model construction method, a Tokamak plasma magnetic response model construction system and a medium. Relates to the technical field of nuclear fusion plasma simulation. According to the scheme, improvement is carried out on the basis of the prior art, modeling is carried out on the magnetic response of the Tokamak plasma on the basis of basic data of the Tokamak plasma, and plasma behaviors are directly learned from experimental data; the simulator taking the plasma magnetic configuration evolution autoregression model as a carrier can process nonlinear terms and high-order terms, and is low in calculation cost, high in speed and capable of being applied in real time; according to the method, the behavior of the plasma under magnetic control can be well simulated, the plasma behavior is directly learned from experimental data without simplifying and assuming plasma properties, and the method can be used for off-line simulation and can also be used for control strategy optimization or fault detection in real time.

The application provides a hetero-composite wave-absorbing material based on attapulgite, a preparation method and application thereof. The wave-absorbing material is prepared by acid activation and high-frequency ultrasonic stirring to disperse attapulgite in a deionized water system to form an attapulgite emulsion, and the well-dispersed attapulgite fibers are uniformly coated with a carbon layer on the surface through hydrothermal stirring and high-temperature carbonization; then, a flower-like NiCo2O4 is grown in situ on the carbon-coated attapulgite to construct a hetero-interface, the carbon-coated attapulgite is used as a dielectric loss material, the flower-like NiCo2O4 is used as a magnetic loss material, through hetero-structure design, the carbon layer can inhibit the skin effect caused by the cross-linked flower-like NiCo2O4, so as to amplify the magnetic response behavior of the NiCo2O4; the hetero-interface formed between the two can significantly enhance the interface polarization, realize impedance matching, significantly improve the microwave absorption performance, and overcome the defects of impedance mismatch and structure design existing in the prior art magnetic-dielectric synergistic wave-absorbing material.

The invention relates to a transient electromagnetic three-dimensional inversion method and device, computer equipment and a storage medium. The method comprises the following steps: decoupling a forward modeling grid and an inversion grid, independently generating a vertical self-adaptive layered special forward modeling grid for each time channel according to the skin depth of the time channel, and remarkably reducing the calculation dimension while keeping the horizontal discrete consistency; an equivalent circuit method is innovatively adopted to achieve high-precision mapping of model parameters from an inversion space to a forward modeling space, a plurality of inversion grid units arranged in the current magnetic field component direction are regarded as series connection, and a plurality of inversion grid units arranged in the direction perpendicular to the current magnetic field component direction are regarded as parallel connection. The equivalent conductivity in the control volume is accurately calculated by using a series-parallel resistance formula, and the precision defect of a traditional method in a complex electrical structure is effectively solved. According to the method, the calculation efficiency and the numerical precision are effectively balanced, and the optimal discretization modeling of the transient electromagnetic response is realized.

The invention discloses a double-spindle turning and milling combined machining center, and relates to the technical field of machine tool machining, the double-spindle turning and milling combined machining center comprises a lathe bed, the lathe bed comprises a spindle unit, the spindle unit comprises a first spindle unit and a second spindle unit, and the first spindle unit and the second spindle unit are oppositely arranged in the horizontal direction and are both in sliding connection with the lathe bed through sliding mechanisms; and the main shafts are independently connected with main shaft driving motors. Temperature field distribution of different axial positions at the front end of the main shaft is identified in real time, each annular electromagnet is independently regulated and controlled to construct a non-uniform magnetic field gradient in the electric control heat conduction pad, and the magnetic response phase change microcapsules are driven to be directionally enriched towards a high-temperature area, so that cooling capacity space distribution and thermal load space distribution are dynamically matched in real time; and the main shaft thermal drift is actively inhibited from the source.

The invention provides a magnetic interface open type fluid chip and a preparation method thereof, and belongs to the technical field of microfluidics and millifluidics. The method comprises the following steps: performing standardization treatment on ferroferric oxide powder to obtain magnetic hydrophobic particles; then wrapping the target liquid with the particles through controllable shaking to form a smooth liquid cake with a magnetic response core-shell structure; dehydrating the smooth liquid cake through programmed stepped heating evaporation treatment to form a wrinkled liquid cake; and finally, cutting and shaping the wrinkled liquid cake by using laser to obtain the magnetic interface open type fluid chip. The magnetic particles form a stable wrapping layer on a liquid-gas interface, so that the chip structure can stably exist in the air without being supported by an oil phase; meanwhile, the optical fiber laser is used for accurately cutting the liquid cake, the channel configuration can be flexibly reconstructed on site according to requirements, and the problems that in the prior art, the environment dependence is high, and the configuration is solidified are effectively solved.

The invention discloses a magnetic field assisted lithium / aluminum air battery and a construction method thereof, and belongs to the technical field of batteries, the magnetic field assisted lithium / aluminum air battery comprises a positive electrode material, a diaphragm, a negative electrode material, an electrolyte and a magnetic field assembly for applying an external magnetic field; the positive electrode material and / or the electrolyte comprise / comprises a metal magnetic material which is in magnetic response with the external magnetic field. According to the magnetic field assisted lithium / aluminum air battery provided by the invention, an ordered magnetic structure is constructed through external magnetic field orientation, the physical and chemical characteristics of a discharge product of the lithium / aluminum air battery can be regulated in situ, and compared with the traditional technology, the magnetic field assisted lithium / aluminum air battery has the remarkable advantages that on one hand, the defects of high structure regulation difficulty, complicated process flow and the like in the preparation of a traditional magnetic catalyst are overcome; and on the other hand, the core bottleneck of slow reaction kinetics of the metal-air battery can be accurately broken through, the dynamic controllable regulation and control of a discharge product are realized, the whole process has the characteristics of environmental protection, simplicity and convenience, and the catalytic activity of the battery can be obviously improved.

This invention belongs to the field of tertiary oil recovery technology, specifically relating to a CO2-switched magnetically driven nanoparticle, its preparation method, and its application. The magnetically driven nanoparticles are silica-coated Fe3O4 nanoparticles. The surface of the silica coating is further modified with amidine groups to act as CO2 switches. These CO2 switches cause the hydrophilicity of the magnetically driven nanoparticles to increase with the increase of CO2 solubility in the solution in which they are located. This invention integrates emulsification and demulsification functions through the CO2 switch loaded on the surface of the magnetically driven nanoparticles. Furthermore, the particles can be recycled using their own magnetic response, reducing costs. This nano-displacement agent can solve the problems of poor efficiency, ineffective oil-water separation, high economic costs, and environmental impact associated with existing displacement agents.

The application discloses a kind of magnetically responsive hydrogel optical fiber and its preparation and application, belong to medical biomaterial field.The optical fiber includes from inside to outside: polyethylene glycol diacrylate and acrylamide photocrosslinking light transmission core layer;Calcium alginate low refractive index skin layer;Doped nano-magnetic response layer of ferriferrous oxide;And polydopamine grafting polyvinylpyrrolidone lubricating layer.It is prepared by coaxial extrusion and light / calcium step-by-step crosslinking.The structure realizes the spatial isolation and anti-interference of light transmission and magnetic drive, has low background light loss and anti-bending stability, has biomechanics matching, ultra-low friction and magnetic field accurate active navigation ability, solves the pain point that extremely soft optical fiber is difficult to directional intervention.Suitable for deep tissue precise photothermal therapy, in vivo continuous optical sensing and minimally invasive diagnosis and treatment integration and other frontier medical fields.

The application discloses a kind of magnetic field auxiliary lithium aluminum air cell and its construction method, it belongs to battery technical field, wherein, the magnetic field auxiliary lithium / aluminum air cell includes: positive electrode material, diaphragm, negative electrode material, electrolyte and the magnetic field component for applying external magnetic field;Positive electrode material and / or the electrolyte include the metal magnetic material that is magnetically responsive with the external magnetic field.The magnetic field auxiliary lithium / aluminum air cell provided by the application, by external magnetic field orientation, constructs ordered magnetic structure, can in situ control the physicochemical characteristics of lithium / aluminum air cell discharge product, compared with traditional technology has significant advantages: on the one hand, overcome the defects such as structural control difficulty, complex process in the preparation of traditional magnetic catalyst;On the other hand, it can accurately break through the core bottleneck of metal-air battery reaction kinetics slow, not only realizes the dynamic controllable regulation of discharge product, and the whole process has the characteristics of environmental protection, simple, can significantly improve the catalytic activity of battery.

The invention discloses multicolor optical anti-counterfeiting alumite and a production process thereof. The alumite sequentially comprises a magnetic-sensitive enhanced substrate layer, a dynamic separation layer, a temperature-magnetic composite nanofiber multicolor layer, a polyelectrolyte alternate deposition barrier layer and a gradient magnetic-sensitive aluminized layer from bottom to top, wherein the magnetic-sensitive enhanced substrate layer, the dynamic separation layer, the temperature-magnetic composite nanofiber multicolor layer, the polyelectrolyte alternate deposition barrier layer and the gradient magnetic-sensitive aluminized layer are arranged on the alumite; wherein the magnetic-sensitive enhanced substrate layer comprises a graphene modified PET supporting layer and a three-dimensional net-shaped micro-channel embedded with Fe3O4 particles, the dynamic separation layer is temperature-sensitive phase change fluororesin, the temperature-magnetic composite nanofiber colorful layer is electrostatic spinning nanofibers of a core-sheath structure, and the blocking layer is of a polyelectrolyte alternate deposition structure and is embedded with infrared invisible identification particles. According to the invention, four anti-counterfeiting functions of multicolor optical response, magnetic response activation and infrared invisible two-dimensional codes are integrated, the advantages of high multicolor optical contrast, fast response, multiple reuse times, excellent barrier performance, stable transfer printing and the like are achieved, the method is suitable for scenes of high-end tobacco and wine, luxury packaging, high-added-value labels and the like, and the anti-counterfeiting grade and the practicability are obviously improved.

This invention discloses a tunable nanoantenna and its fabrication method, belonging to the field of nanoantenna technology. The tunable nanoantenna comprises, from top to bottom: an ordered metal mesh nanoelectrode layer, Fe... 3 O 4 The invention comprises a magnetic nanosphere layer, a silicon nanopillar micro / nanostructure layer, a substrate layer, and a lower electrode layer. This invention proposes a tunable nanoantenna and its fabrication method. Specifically, this invention combines silicon nanopillars with Fe... 3 O 4 By combining magnetic nanospheres and utilizing their synergistic effect, a composite nanoantenna with magnetic response and optical resonance characteristics can be constructed. This not only breaks through the limitations of single-material control, but also enables more flexible performance control through the dual effects of magnetic and optical fields.

The invention provides acellular matrix hydrogel loaded with animal acellular omentum particles as well as a preparation method and application of the acellular matrix hydrogel loaded with the animal acellular omentum particles, and relates to the technical field of tissue engineering and regenerative medicine. Comprising a decellularization treatment agent, a decellularization matrix, functional particles, an enzymolysis agent, a cross-linking stabilizer, a functional additive and a solvent, the functional additive is prepared from PDA coated Fe3O4 magnetic nano particles, phosphorylated polyglycerol sebacate and liposome coated silver nano particles. The PDA-Fe3O4 magnetic nanoparticles of the functional additive generate mechanical signals under the action of an external magnetic field, a Piezo1 mechanical gating cation channel is activated to promote calcium ion internal flow, and the autonomous mineralization ability of phosphorylated polyglycerol sebacate is combined, so that the activity of the bone differentiation marker alkaline phosphatase is effectively improved, and the bone differentiation marker alkaline phosphatase is prepared. The combination of the PDA coated Fe3O4 magnetic nanoparticles and the phosphorylated polyglycerol sebacate integrates a magnetic response mineralization system.

The invention relates to the technical field of permanent magnet magnetizing, and discloses a complex curved surface permanent magnet multi-pole magnetizing method and system. The method comprises the following steps: preparing a permanent magnet to be magnetized and importing magnetization vector field data; carrying out adaptive grid division on the permanent magnet to be magnetized, determining a magnetizing sequence from strong to weak, and planning a magnetizing path; pre-magnetizing each magnetizing unit according to a path sequence, and generating a pulsed magnetic field meeting parameter requirements to complete magnetizing; magnetic field distribution measurement and deviation calculation are carried out, an actual magnetization vector field is reconstructed, the deviation between an actual magnetization vector and a target magnetization vector is calculated, and standard exceeding units exceeding a precision threshold value are identified; and establishing a magnetizing response model, obtaining coupling interference of adjacent units, calculating compensation parameters of standard-exceeding units, and performing iteration until the whole magnetic field distribution meets the precision requirement. Omnibearing and high-precision multi-pole magnetizing of the complex curved surface permanent magnet is achieved, the magnetizing direction can be continuously changed in a three-dimensional space, and interference of adjacent areas is effectively restrained.

The invention relates to a magnetic control self-conformal intestinal stent and a dynamic monitoring system, and belongs to the technical field of medical instruments, and the magnetic control self-conformal intestinal stent comprises a biodegradable main skeleton, a magnetic driving unit, a pressure sensing array and an in-vitro control device. A magnetic response material is embedded into the main framework, and form regulation and control and degradation rate control are realized through an in-vitro magnetic field; the flexible sensing array monitors intestinal wall pressure in real time, and the self-adaptive structure is linked to dynamically adapt to the intestinal tract curved surface. The in-vitro device integrates magnetic field adjustment and data processing, and supports precise positioning of the support and intelligent adjustment of the attaching force. The system improves the stability in a complex intestinal environment through magnetic coupling driving and multi-mode monitoring, early warns abnormal risks in real time, and avoids the rigid defect and monitoring lag problems of a traditional stent. The biodegradable material is combined with intelligent control, the degradation process and tissue repair are synchronized, a safe and effective treatment scheme is provided for diseases such as intestinal obstruction, and the treatment effect of a patient is improved.

The invention provides an acoustic-magnetic dual-mode diagnosis and treatment agent as well as a preparation method and application thereof, and belongs to the technical field of preparation of tumor diagnosis and treatment agents. The acoustic-magnetic dual-mode diagnosis and treatment agent is surface-modified magnetic nanoparticles which contain nano balloon genes and are subjected to Escherichia coli induced expression; the nucleotide sequence of the nano-balloon gene is a sequence shown as NCBI: KC601845.1, escherichia coli in the acoustic-magnetic dual-mode diagnosis and treatment agent as a diagnosis and treatment agent carrier has an active targeting property on a tumor hypoxic region, and bacteria contain a nano-balloon and have an acoustic response characteristic; the escherichia coli surface modified magnetic nanoparticles have a magnetic response characteristic. In acoustic-magnetic dual-mode imaging, firstly, on a real-time ultrasonic contrast monitoring image, a nano air bag expressed in bacteria can generate an enhanced tumor ultrasonic echo signal; secondly, under the action of an external changing magnetic field, the magnetic nanoparticles on the surfaces of the bacteria can generate an enhanced tumor magnetic vibration imaging effect, so that more efficient tumor diagnosis and / or treatment can be realized.

The application discloses a lateral flow immunochromatography test paper based on enzyme / magnetic driving magnetic gold nano probes. First, a magnetic gold nano composite material (Fe3O4@PDA@AuNS, MPAuNS) with a core (Fe3O4)-shell (PDA) structure and modified with gold nano stars (AuNS) on the surface is synthesized, and the magnetic gold nano composite material is applied to lateral flow immunochromatography cardiac troponin I (cTnI) detection as a nano probe. The enzyme / magnetic driving refers to: 1) the glucose oxidase activity of the gold nano star is used to drive the diffusion enhancement of the nano probe by catalytically decomposing glucose in the cTnI solution; and 2) the magnetic response characteristics of the Fe3O4 core are used to realize the magnetic driving movement of the nano probe by placing a magnet on the absorption pad through magnetic attraction. The probe can improve the speed and sensitivity of lateral flow immunochromatography detection to a certain extent.

The application relates to the technical field of micro-nano processing, and particularly relates to a magnetic response suspended droplet control platform, which comprises a silica gel substrate, silica gel microcolumns arranged in an array on the silica gel substrate and a silica gel film installed at the top end of the silica gel microcolumns, and the silica gel substrate and the silica gel microcolumns are integrally formed. In the magnetic response suspended droplet control platform, the silica gel film has large concave deformation and high sensitivity, can freely control droplets, and solves the problem that the current magnetic control film needs to be placed in suspension and has small concave deformation, and meanwhile, the magnetic response suspended droplet control platform can complete horizontal transportation and anti-gravity transportation of droplets.

This invention relates to the field of microbial-nanomaterial cross-integration technology, specifically to a remediation agent and method for heavy metal contaminated soil based on the targeted regulation of microbial communities. The agent comprises a gene-edited composite microbial community, a nanocatalytic composite system, intelligent regulatory additives, and magnetically responsive materials. The method includes soil electric field pretreatment, agent compounding, magnetoelectric synergistic remediation, dynamic regulation, and maturation monitoring. It synergistically reduces the bioavailable form of heavy metals through photocatalysis, magnetic response, and gene editing technologies, thereby improving remediation efficiency. This invention enhances the tolerance and remediation efficiency of the microbial community through gene editing, nanocatalysis, and magnetoelectric synergistic technologies, shortens the remediation cycle, achieves a significant reduction in the bioavailable form of heavy metals, and simultaneously improves soil ecology. It is suitable for complex contaminated soils, environmentally friendly, and causes no secondary pollution.

The invention relates to the technical field of lubricants, in particular to a magnetic response oil-based carbon material additive and a preparation method and application thereof. The invention provides a magnetic response oil-based carbon material additive. The magnetic response oil-based carbon material additive is of a core-shell structure, the core of the core-shell structure is a carbon material, and the shell of the core-shell structure comprises ferroferric oxide and alkyl trimethyl metal bromide; the carbon material, the ferroferric oxide and the alkyl trimethyl brominated metal salt are combined together through an electrostatic adsorption effect. The magnetic response oil-based carbon material additive is not easy to agglomerate and has good dispersity in a medium.

This application discloses a data analysis-based method and system for tracing the production quality of steel cylinders. The method includes: applying an alternating magnetic field to the steel cylinder; rotating and scanning the steel cylinder to obtain magnetic response data of the weld area; determining the magnetic flux leakage signal of the steel cylinder and obtaining high-dimensional magnetic fingerprint features from the magnetic flux leakage signal; acquiring high-dimensional magnetic fingerprint features under different operating conditions; determining a structural stability feature subset and a state-sensitive feature subset based on the high-dimensional magnetic fingerprint features under different operating conditions; generating a magnetic fingerprint relationship template by combining the structural stability feature subset; constructing a corresponding healthy baseline manifold based on the magnetic fingerprint relationship template; determining the steel cylinder quality residual vector by combining the state-sensitive feature subset and the healthy baseline manifold; determining the steel cylinder quality degradation type and degree by using the steel cylinder quality residual vector; and generating a production quality traceability report by combining the steel cylinder quality degradation type and degree. This application can effectively improve the accuracy of steel cylinder production quality traceability.

The application relates to the technical field of semiconductors, and provides a printed circuit board via hole forming method and a printed circuit board. The method comprises the following steps: providing a substrate provided with a via hole to be filled; forming a magnetic response layer on the surface of the substrate, covering one side surface of the substrate and covering the opening of the via hole; filling the via hole with a filler containing conductive particles; placing the substrate in an adjustable magnetic field in three orthogonal directions, driving the conductive particles in the filler to gather and magnetize through the magnetic field, forming chain-shaped aggregates, and gradually forming a particle column parallel to the axial direction of the via hole; solidifying the filler by using laser sintering to further tightly connect the conductive particles; further solidifying the filler by using hot air heating; stripping and removing the magnetic response layer on the surface of the substrate by using a stripping liquid; and polishing the surface of the substrate to make the surface of the via hole and the surface of the substrate flat. The application can effectively solve the problem of pad depression on the via hole, and can improve the conductive efficiency of the printed circuit board.