199 results about "Pulse magnetic field" patented technology

The invention discloses an SERF atom magnetometer double-axis magnetic field detection method and device based on pulsed magnetic field modulation, relates to the technical field of magnetic field precision measurement, and compresses the action time of a modulation magnetic field additionally applied in the same unit period on a hot atom ensemble by replacing conventional continuous sinusoidal magnetic field modulation with pulsed magnetic field modulation. The pulse magnetic field with the duty ratio of d can reduce the spin exchange relaxation rate to 2d times of that of a conventional method under the same modulation amplitude and frequency, due to the fact that the spin exchange relaxation rate is effectively restrained, the collected polarizability response signal is obviously improved, and the polarizability response signal can be obtained through the pulse magnetic field with the duty ratio of d and the pulse magnetic field with the duty ratio of d. Low-relaxation-rate sensitivity-enhanced double-axis magnetic field measurement under a pulse modulation scheme is realized, the double-axis measurement sensitivity of a miniaturized SERF atom magnetometer is further improved, and the method has great significance in supporting leap-type development of a future array type extremely-weak magnetic imaging system and medical application thereof.

The invention belongs to the technical field of integrated die casting, and relates to an integrated die casting forming method and system based on multi-magnetic-field coupling. The method comprises the steps that S1, metal raw materials are subjected to smelting, degassing modification and deslagging standing, and a metal melt is obtained; s2, in the inert gas environment, electromagnetic stirring is conducted on the metal melt; s3, the mold is subjected to mold heating, heat preservation and pressure maintaining, vacuumizing and release agent spraying; s4, the metal melt is pressed into a mold cavity for mold filling and solidification, a coupling magnetic field is applied to the metal melt, and an integrated die casting is obtained; wherein the coupling magnetic field covers a mold cavity and is used for improving the flowability of a metal melt during mold filling, inhibiting turbulent flow and refining the structure of the metal melt after solidification; the coupling magnetic field comprises a direct-current magnetic field and a pulsed magnetic field, the direct-current magnetic field penetrates through the metal melt from bottom to top, and the pulsed magnetic field penetrates through the metal melt from the side of the mold cavity. By means of the method, the high-quality integrated die casting can be manufactured.

The invention provides a secondary battery and a manufacturing method thereof, a battery device, an energy storage device and a power utilization device, which are at least beneficial to improving the performance of the secondary battery. The manufacturing method comprises the steps that magnetic composite filler comprising an ionic conductor core is prepared, the surface of the ionic conductor core is sequentially coated with a magnetic functional layer and a protective layer, the magnetic functional layer is made of a magnetic material, and the protective layer is made of an oxide; preparing a polymerization precursor comprising the magnetic composite filler, a polymer matrix, an initiator, a lithium salt and a solvent; coating the polymeric precursor under a pulsed magnetic field to form a film, so that the magnetic composite filler is directionally arranged along the thickness direction of a film layer; initiating the polymerization precursor to generate polymerization reaction, so that the polymerization precursor is cured and molded into a solid electrolyte membrane; a positive plate and a negative plate are provided, the positive plate, the solid electrolyte membrane and the negative plate are subjected to winding treatment or lamination treatment and then put into the shell, and an initial battery cell is formed.

The invention discloses an electromagnetic and hydraulic combined bulging and correcting method for a pipe plate. The method comprises the steps of 1, feeding treatment, 2, electromagnetic pre-activation treatment, 3, hydraulic precise bulging treatment, 4, pressure maintaining and shaping treatment, 5, electromagnetic and hydraulic collaborative correcting treatment and 6, material taking and post-treatment. The device comprises a machine frame which is vertically symmetrical and provided with a forming lower die and an opening and closing upper die through a hydraulic oil cylinder, a temperature sensor and a strain gauge are embedded in the lower side in a die cavity, high-frequency induction coils are arranged on the outer surfaces of the forming lower die and the opening and closing upper die, and a pulsed magnetic field generator is embedded in the top in the opening and closing upper die. A liquid injection opening is formed in the side edge of the upper opening and closing mold and is connected with a high-pressure oil pump through a pipeline; a main controller is further arranged on the rack; through a staged coupling process, the deformation resistance during bulging is reduced, elastic recovery is eliminated through cooperative shape correction, meanwhile, the device integrates multiple modules, real-time matching of electromagnetic parameters and hydraulic pressure is achieved, and the device adapts to forming of pipe plates made of different materials and in complex shapes.

The invention discloses a method for preparing fine-grain copper and copper alloy through pulsed magnetic field and rare earth adding composite regulation and control, and belongs to the technical field of copper and copper alloy material preparation. Graphite mold casting is adopted in the method, and the method comprises the specific steps that electrolytic copper with the purity larger than or equal to 99.95 wt% or a copper alloy with specific components is prepared as a matrix raw material; after smelting, adding pure lanthanum blocks and uniformly stirring; after the melt is poured into a preheating mold, a pulsed magnetic field is applied immediately for treatment, and the parameters of the magnetic field are as follows: the pulse voltage is 180-250 V, the frequency is 4.5-6.5 Hz, and the duration time is 15-20 minutes. According to the method, the heterogeneous nucleation effect of rare earth lanthanum is combined with the melt forced convection and dendritic crystal crushing effect caused by the pulsed magnetic field to synergistically refine a solidification structure and promote columnar crystal orientation equiaxed crystal transformation, so that a cast ingot with fine crystal grains is directly obtained in the casting stage, and the possibility is provided for simplifying the subsequent processing technology.

The invention discloses a result verification method for a transcranial magnetic stimulator calibration device, and relates to the technical field of medical equipment detection, and the method comprises the following steps: collecting pulse magnetic field parameters outputted by a TMS therapeutic instrument in real time through constructing a multipath parallel magnetic field distribution perception array composed of a plurality of coil type magnetic field sensors; designing a three-dimensional calibration platform to perform multi-dimensional dynamic calibration on the magnetic field distribution sensing array, calibrating the relationship between the induced electromotive force and the magnetic induction intensity of the sensor, and verifying whether the measurement error is less than + / -0.1% or not; and comparing the actually measured magnetic field data with the human brain magnetic field distribution data simulated by the finite element simulation model, analyzing the difference value between the simulation data and the actually measured data, and correcting the system according to the data deviation degree. According to the transcranial magnetic stimulator calibration device and the result verification method, real-time acquisition and high-precision calibration of dynamic parameters are realized through a multi-path synchronous magnetic field sensing array, and the calibration reliability is verified based on finite element simulation and actually measured data comparison.

The invention discloses an embedded electromagnetic actuating array flexible robot system based on pulse driving and a preparation method of the embedded electromagnetic actuating array flexible robot system, and belongs to the technical field of flexible robots. The system comprises a flexible actuating body, a multi-channel pulse driving controller, a sensing unit and a processing unit. A conductive coil array capable of independently addressing is embedded in the body, and magnetic particles are dispersed in the material of the conductive coil array. The driving controller can output independent programmable pulse current to each coil, a pulsed magnetic field is excited around the coils, the magnetic field interacts with the magnetic particles, electromagnetic force and magnetic torque are generated in the flexible body, and therefore the body is driven to generate controllable deformation. The sensing unit monitors the deformation or stress state of the body in real time, the processing unit dynamically adjusts pulse parameters according to target deformation and sensing feedback, and precise closed-loop control is achieved. According to the system, a space-time division multiplexing strategy is adopted to coordinate multi-channel excitation, and magnetic field crosstalk is effectively inhibited; and efficient thermal management is realized through combination of a low-duty-ratio pulse working mode and a high-thermal-conductivity base material. The device has the advantages of being fast in deformation response, large in output force, high in programmable degree, accurate in control and the like, and has wide application prospects in the fields of soft robots, self-adaptive grippers, bionic motion platforms, medical instruments, man-machine interaction equipment and the like.

The invention discloses a cerebral cortex stimulation central nervous regulation system and method based on a pulse magnetic coil, and the system comprises a pulse magnetic stimulation module, a neural signal collection module, a central control module and a man-machine interaction module, and is additionally provided with a three-dimensional positioning module and a multi-level safety monitoring module. The pulse magnetic stimulation module generates a focused pulse magnetic field, the neural signal acquisition module acquires multi-brain-region electric signals, and the central control module dynamically regulates stimulation parameters after analyzing the signals to form closed-loop regulation; the three-dimensional positioning module ensures accurate positioning of the coil, the safety monitoring module monitors parameters in real time and triggers emergency protection, and the man-machine interaction module realizes convenient operation and data management. According to the method, adjustment is completed through initialization, signal acquisition and analysis, precise stimulation, positioning adjustment and safety monitoring. The scheme is non-invasive, accurate, safe and suitable for nerve research and disease treatment, the regulation effect and use safety are improved, and development of the nerve regulation technology is promoted.

The invention is applicable to the field of metal material nondestructive testing, and provides a method for correcting wall thickness of a small block defect in pulsed eddy current testing, which comprises the following steps: starting a pulsed eddy current testing probe, and exciting a pulsed magnetic field by the probe to induce an eddy current field in a tested metal conductor; setting a detection step length, gradually scanning and detecting the defect direction of the detected metal conductor small block by a detection probe from a starting point, and automatically calculating and acquiring a wall thickness value at each detection point position; recording an initial change detection point and an end point change detection point of the wall thickness value obtained by scanning detection, calculating the distance DSE between the initial change detection point and the end point change detection point by combining the step length, and then calculating the defect size LDEF of a small block; and the minimum value h of the wall thickness values obtained through scanning detection is taken, and the actual wall thickness value h2 of the small block defect is calculated according to a correction formula. Through the correction method, the block defects smaller than the footprint size can be correctly evaluated, and serious consequences caused by wrong evaluation of small block serious defects are avoided.

The invention discloses a pulsed high-intensity magnetic field generation device and method. The device comprises a vacuum chamber; the spiral backflow assembly is located in the vacuum cavity and comprises a conductive bottom plate, a conductive top plate located over the conductive bottom plate and a plurality of conductive spiral rods, a first through hole is formed in the conductive bottom plate, one end of each conductive spiral rod is connected to the conductive bottom plate, and the other end of each conductive spiral rod is connected to the conductive top plate; the plurality of conductive screw rods are uniformly distributed in the circumferential direction around the axis of the first through hole and have the same spiral direction; the plasma generating assembly comprises a first conductive block penetrating through the first through hole and not making contact with the bottom plate, a second conductive block located over the first conductive block and connected with the conductive top plate and a plurality of micron-sized conductive wires, one ends of the micron-sized conductive wires are connected to the first conductive block, and the other ends of the micron-sized conductive wires are connected to the second conductive block; the plurality of micron-sized conductive wires are uniformly distributed in the circumferential direction around the axis of the first through hole; the positive electrode of the pulse current source is electrically connected to the conductive bottom plate, and the negative electrode is electrically connected to the first conductive block. The invention aims to generate pulsed magnetic field intensity by using a simple device structure.

The application belongs to the technical field of alloy, and particularly relates to a pulse magnetic field heat treatment method for A356 aluminum alloy. The heat treatment method provided by the application comprises the following steps: sequentially performing solid solution treatment and aging treatment on the aluminum alloy casting under the condition of a pulse magnetic field; the holding time of the solid solution treatment is 20-50 min, and the holding time of the aging treatment is 30-60 min. The pulse magnetic field is applied in the holding stage of the solid solution treatment, so as to improve the Gibbs free energy of the system, improve the dissolution and diffusion rate of strong elements such as Si and Mg in the matrix, and obtain a supersaturated solid solution in a short time. In the holding stage of the aging treatment, the pulse magnetic field reduces the thermodynamic energy barrier of the second phase precipitation of the alloy, improves the nucleation rate of the second phase, and accelerates the precipitation and growth of the second phase. The heat treatment in the pulse magnetic field greatly shortens the heat treatment time, and the heat treatment time of the A356 aluminum alloy is only 50-110 min.

The application discloses a kind of based on directional shuttle-shaped cavity bimodal flexible capacitive sensor and preparation method thereof, belong to flexible electronic sensor technical field, by dispersing magnetic nanoparticles in low boiling point solvent to form magnetic fluid, emulsification dispersion in hydrogel prepolymer liquid, after rheological control, in turn carry out uniform magnetic field pre-stretching and pulse magnetic field strengthening lengthening, make droplet form shuttle-shaped;Again by half freezing lock shape, vacuum freeze drying removes solvent and makes magnetic nanoparticles deposit in cavity inner wall, completely freeze polymerization makes matrix solidification, finally in situ reduction forms conductive layer and is packaged and is prepared sensor, it has bimodal: when pressure is along the long axis direction of shuttle-shaped cavity, it is first electric capacity change rate, when it is along short axis direction, it is second electric capacity change rate, and second electric capacity change rate is greater than first electric capacity change rate, and pressure direction is identified by single electric capacity pair.The application structure is simple, sensitivity is high, stability is good, is suitable for electronic skin, intelligent prosthesis and man-machine interaction field.

The utility model relates to reverse osmosis (RO) membrane separation electroplating waste liquid treatment equipment which is characterized in that a net cylinder is arranged in an inner cavity of a filter shell, a hollow fiber separation membrane is fixedly sleeved on the outer side of the net cylinder, a connecting plate is fixedly arranged at the bottom of the net cylinder, a containing cavity is arranged at the top end of the connecting plate and inside the net cylinder, and a pulse magnetic mechanism is arranged in the containing cavity. The pulse magnetic mechanism comprises at least one group of magnetic field generation units, each group of magnetic field generation units comprises a cylindrical iron core and a magnetic field generation coil, the magnetic field generation coil is wound on the outer side of the cylindrical iron core, and the magnetic field generation coil of each group of magnetic field generation units is connected to a pulse power supply and generates a pulse magnetic field in the accommodating chamber; a mounting hole is formed in the bottom of the filter shell, and the connecting plate is detachably arranged in the mounting hole; under the action of a high-intensity magnetic field generated by the pulse magnetic mechanism, the metal ions are pushed to be separated from the separation membrane, and the metal ions can be recycled after being further collected and treated.

The invention discloses a process for regulating and controlling precipitated phase distribution of regenerated 6XXX series aluminum alloy based on an electromagnetic-ultrasonic composite field, and relates to the technical field of metal material processing. The method comprises the following steps: introducing a carboxyl modified polyaryletherketone-siloxane copolymer assistant in a solid-phase temperature zone, applying ultrasonic waves to synchronously act with a pulsed magnetic field, and then carrying out artificial aging. According to the method, the aging peak time is remarkably shortened, the precipitated phase is refined and homogenized, the mechanical property is obviously improved, and an innovative and efficient path is provided for improving the structure stability and performance consistency of the regenerated aluminum alloy.

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 provides a linear nuclear fusion device and an application method. The linear nuclear fusion device comprises a non-metal vacuum chamber, a coil assembly, a power supply system and a control system. By adopting an FRC configuration without a central conductor, a core large-scale component of a traditional fusion device is omitted; the high space utilization rate and the high integration of functional areas are realized through linear, centrosymmetric and five-section layout; the conical acceleration area has acceleration and compression functions, so that independent modules are reduced, and the compactness of the device is improved; the high consistency of two groups of FRC plasmas in quality, speed and phase is ensured through linear, centrosymmetric and five-section layout, and the reliability of the device is remarkably improved; in addition, the non-metal vacuum chamber is adopted, and the non-metal vacuum chamber can be made of non-metal materials such as quartz or ceramic, so that eddy-current loss and impurity sputtering of a metal wall surface in a pulsed magnetic field are avoided, the service life of FRC plasmas is prolonged, and the fusion reaction efficiency is improved.

The invention provides a preparation method of a wear-resistant thermal shrinkage film, which comprises the following steps: optimizing a raw material formula, forming a three-layer structure, namely a fluorine-containing layer, a self-repairing modified layer and a supporting layer, inducing filler orientation by a gradient drawing process in combination with a pulsed magnetic field, and performing surface corona modification treatment and nano silicon dioxide coating, thereby obtaining the wear-resistant thermal shrinkage film. The prepared heat shrink film has remarkable advantages in the aspects of wear resistance, self-repairability, mechanical strength, optical performance and stability, and is particularly suitable for the fields of high-end cigarette packets, electronic devices and the like which have extremely strict requirements on packaging materials. Experimental results show that the wear-resistant life of the heat shrink film is doubled, the self-repairing rate reaches 88-95%, the tensile strength is 78-85 MPa, and the light transmittance is 89-93%.

The invention discloses a method for preparing a high-performance rare earth magnesium-silicon-iron alloy through cooperation of pulsed magnetic field treatment and multi-element microalloying, and belongs to the technical field of metallurgy. The method comprises the following steps: smelting ferrosilicon-based alloy liquid in a submerged arc furnace; the base liquid is thermally loaded into a medium-frequency induction furnace, trace elements such as Ba, Sr, Sb and Bi are added in a cored wire feeding mode, and electromagnetic stirring is conducted to achieve multi-element microalloying; the alloy liquid is heated and then subjected to pulsed magnetic field treatment, the parameters are as follows: the magnetic field intensity is 0.5-3.0 T, the pulse frequency is 5-30 Hz, and the treatment time is 5-20 minutes; then adding magnesium and nitrogen under pressure and stirring; and finally, casting and quickly cooling under the protection of nitrogen. The solidification structure is refined through the pulsed magnetic field, the yield of microelements is increased through core-spun yarn feeding, the magnesium oxide content is reduced through nitrogen protection in the whole process, segregation is restrained through rapid cooling, the magnesium oxide content in the prepared alloy is smaller than or equal to 6% of the magnesium content, the macrosegregation degree is smaller than or equal to 0.3, and the average grain size is smaller than or equal to 50 micrometers. The alloy prepared through the method is good in spheroidizing stability, uniform in structure, low in cost and suitable for production of high-end nodular iron castings.

The application discloses a device for measuring the magnetic field distortion of a pulsed magnet, which comprises an arrayed measuring coil assembly and an analog integrator; the arrayed measuring coil assembly comprises multiple layers of PCB circuit boards which are placed in an upper-lower overlapping mode; each layer of the PCB circuit boards is engraved with N groups of coils which cover the field region of the pulsed magnet; the coils of different layers of the PCB circuit boards adopt the same spiral direction and are connected with each other through through holes; the analog integrator comprises a primary signal integrator for processing an induced voltage primary signal and a differential signal integrator for processing a differential signal; a single coil signal is connected to the primary signal integrator; the wires of different groups are reversely connected with each other, and the differential signal is connected to the differential integrator; and a corresponding measuring method is also disclosed.

The utility model discloses an LTD driving system, a pulse power device and a steep pulse ablation instrument, which are applied to the technical field of steep pulse ablation and are used for solving the problems of unstable steep pulse high-voltage output amplitude and large rising edge and falling edge time deviation of the pulse power device in the prior art. Comprising the following steps of: synchronously generating a pulse magnetic field in a magnetic core when primary coils of the transformers of all stages are synchronously electrified in a pulse manner through a standardized coil winding mode and unified relative position arrangement of the transformers in the LTD driving system, and finally, synchronously inducing pulse voltage in secondary coils of the transformers of all stages; and therefore, the amplitude of the steep pulse after the pulse voltage induced by each stage of transformer is superposed is stable, and the time deviation of a rising edge and a falling edge is small.

The invention is applicable to the technical field of cold-rolled tube manufacturing, and provides a high-strength cold-rolled tube manufacturing method which comprises the following steps: designing Fe-Co-Ni-Cr-based metastable-state high-entropy alloy components, and adopting a multi-field coupling asynchronous cold rolling unit integrating ultrahigh-frequency pulse induction heating, a strong pulse magnetic field and an ultrahigh-speed aerial fog copious cooling module, so that the high-strength cold-rolled tube is manufactured. Synchronously applying the physical field in rolling deformation; according to the process, instantaneous conjugation of plastic deformation-phase change-amplitude modulation decomposition is forcibly realized, and a three-dimensional nano interlocking reinforced structure consisting of an ultra-fine grain matrix, a nano sheet layer and nano particles is constructed in the pipe in one step, so that ultrahigh strength and good toughness are synchronously obtained; the cold-rolled tube prepared by the method does not need subsequent aging or tempering, the tensile strength can reach 1600 MPa or above, the ductility is not lower than 8%, and the cold-rolled tube has high uniformity, designable functional gradient and high process integration level.

The invention discloses a solid solution and aging treatment method for preparing an aluminum alloy with balanced strength and toughness, which comprises the following steps: placing an extruded aluminum alloy profile at 510 + / -5 DEG C for heat preservation for 1 hour, and then carrying out high-pressure nitrogen fog quenching; after solid solution, immediately immersing into liquid nitrogen for copious cooling for 1 hour, then rapidly heating to 100 DEG C, and keeping the temperature for 30 minutes; repeating the cryogenic-medium temperature circulation for three times; aging treatment is conducted after cryogenic circulation, specifically, pre-aging is conducted, treatment is conducted for 6 hours at the temperature of 90 + / -5 DEG C, and a 1T pulsed magnetic field is synchronously applied; aging for the second time, heating to 130 + / -5 DEG C, preserving heat for 5 hours, and applying a stable electric field of 50V / cm; and aging for the third time, continuously heating to 155 + / -5 DEG C, preserving heat for 10 hours, and superposing 0.5 T alternating magnetic field to obtain a finished product. Through the technical path of collaborative regulation and control of cryogenic and electromagnetic fields, the method has the outstanding advantages of accurate and controllable technological parameters, low equipment modification cost and high production line adaptability.

The invention relates to the field of chemical oxygen-iodine lasers, in particular to a mid-infrared wavelength conversion method and device of a chemical oxygen-iodine laser. Firstly, a pair of pulsed magnetic field generators is placed on the upper side and the lower side of a gain area of an original continuous wave chemical oxygen-iodine laser; the hydrogen Raman pool is used as a magnetic gain switch to enable the laser to output laser pulses with higher peak power, then 1315nm wavelength laser output by the oxygen-iodine chemical laser is guided into the hydrogen Raman pool, the original 1315nm wavelength laser is converted into 2900nm wavelength laser through Raman scattering to be output, finally, the 2900nm wavelength laser is guided into the vacuum bin containing the iron-doped zinc selenide crystal, and the iron-doped zinc selenide crystal is obtained. And by pumping the iron-doped zinc selenide crystal, the laser with the wavelength of 2900 nm is further converted into intermediate infrared laser pulses with the wavelength of 4000-5000 nm. On the premise that the original laser structure is not influenced, the oxygen-iodine chemical laser has the possibility of being applied to the middle infrared band.

The invention discloses a pulsed magnetic field assisted rotary swaging Cu-Be-Pb alloy bar structure refining process, and belongs to the technical field of metal material machining. The process comprises the steps of blank preparation, rotary swaging equipment debugging, pulsed magnetic field parameter setting, multi-pass pulsed magnetic field assisted rotary swaging, finished product treatment and the like. By setting specific pulsed magnetic field parameters, rotary swaging deformation and a machining time sequence, structure refining machining of the Cu-Be-Pb alloy bar is achieved. According to the process, by optimizing the matching mode of rotary swaging and the pulsed magnetic field, the operability of the process is improved, and the process is suitable for batch machining of the Cu-Be-Pb alloy bars.

The present invention relates to determining the current thickness of a workpiece during machining in a rolling mill (100), the method comprising: acquiring (S102) a data signal reflecting the time-dependent nature of eddy current decay in the workpiece caused by an applied pulsed magnetic field; determining (S104) a thickness parameter value based on the acquired signal, the thickness parameter value being determined from a sample in the data signal, the thickness parameter value depending on the ratio between the thickness of the workpiece and the resistivity of the workpiece; calculating (S106) the ratio between a reference thickness value of the workpiece and the thickness parameter value, thereby providing an instantaneous resistivity value; determining (S108) an average resistivity value based on the instantaneous resistivity value; and providing (S110) an output signal based on the average resistivity of the workpiece and the thickness parameter value, the output signal indicating the determined current thickness of the workpiece.

This application relates to the field of implantable medical device technology, and discloses a temporary cardiac pacing system and method. The temporary cardiac pacing system includes: an external control device and a temporary cardiac pacing device; the temporary cardiac pacing device includes an energy supply unit and a magnetic control unit; the energy supply unit and the magnetic control unit are connected via a connector; the external control device is used to generate pulsed magnetic field signals; the magnetic control unit is used to use the pulsed magnetic field signals to pulse-conduct the circuitry of the temporary cardiac pacing device, thereby controlling the energy supply unit to pulse-discharge, thereby stimulating the myocardium to induce contraction and achieve cardiac pacing. Because magnetic fields have the unique physical advantage of penetrating biological tissue almost without damage, using magnetic field signals to penetrate biological tissue can avoid damage to the biological tissue, thereby reducing the safety risks of the temporary cardiac pacing device.

In some implementations, a method for performing a plasma process in a chamber is provided, including: supplying a process gas to the chamber; applying pulsed RF power to the process gas in the chamber, the pulsed RF power being provided at a predefined frequency, wherein the applying of the pulsed RF power to the process gas generates a plasma in the chamber; during the applying of the RF power, applying a pulsed DC current to a magnetic coil that is disposed over the chamber, wherein the pulsed DC current is provided at the predefined frequency.

A device for the coordinated regulation of rotating and pulsed magnetic fields includes: a magnetic field generating unit, magnetic thrombolytic particles, a control system, and a positioning and navigation module. This invention employs a synergistic design of coaxially nested rotating and pulsed magnetic fields, utilizing both the rotating magnetic field to provide mechanical shearing and the pulsed magnetic field to activate the fibrinolytic system. This synergistic effect not only achieves non-invasive and precise targeted treatment but also overcomes the efficiency bottleneck of a single magnetic field. Combined with real-time image closed-loop feedback and dynamic parameter adjustment, this strategy effectively resolves the contradiction between the difficulty of particle retention and powerful thrombolysis, improving thrombolysis efficiency by more than 30% and achieving efficient, non-invasive, and precise treatment.

The invention provides a preparation method of high-carbon chromium bearing steel, which can be used for preparing a GCr15SiMo bearing steel continuous casting billet with high carbide uniformity, is suitable for a large-specification wind power bearing, and comprises the following steel components: 0.95%-1.05% of C, 0.65%-0.85% of Si, 0.20%-0.40% of Mn, 1.40%-1.70% of Cr, 0.30%-0.40% of Mo, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.05%-0.10% of V, 0.0030%-0.0050% of N, less than or equal to 0.0020% of O, less than or equal to 0.0002% of H, less than or equal to 0.040% of Al and the balance of Fe. The preparation method comprises the steps of electric arc furnace steelmaking, LF refining, VD vacuum treatment, continuous casting, pulsed magnetic field treatment and slow cooling. According to the invention, through specific proportioning of C, Si, Mn, Cr, Mo, V and N, V (C, N) is utilized to refine the structure in the early stage of solidification, and favorable conditions are created for subsequent acquisition of uniform carbides; and the whole process from liquid state solidification to solid state phase change is cooperatively controlled in a staged manner by utilizing a full-process technical scheme of combining low superheat degree continuous casting, three-section type electromagnetic stirring and online pulsed magnetic field treatment.

The invention provides a building outer wall hollowing identification method and system based on pulsed eddy current thermal imaging, and the method comprises the steps: enabling a pulsed eddy current excitation device to act on the surface of a building outer wall, applying transient pulsed magnetic field excitation to a metal component in a wall body, and enabling the metal component to sense eddy current and serve as an internal heat source to generate Joule heat; synchronously acquiring the transient pulsed magnetic field excitation by using an infrared thermal imager to obtain a heat map sequence formed by internal heat conduction on the surface of the outer wall of the building, and preprocessing the heat map sequence; and on the basis of the preprocessed heat map sequence, solving a heat conduction inverse problem to reconstruct a wall internal thermal attribute feature map, and on the basis of the wall internal thermal attribute feature map, completing the identification of the building external wall hollowing. According to the invention, deep, accurate, quantitative and automatic detection of building outer wall hollowing is realized, and reliability, efficiency and applicability are obviously better than those of the prior art.