563 results about "High temperature superconducting" patented technology

The invention relates to the technical field of diodes, and particularly discloses a high-temperature superconducting diode structure model which is used for solving the problems that an integrated circuit is high in power consumption and low in speed, and a traditional semiconductor technology is difficult to meet requirements. The semiconductor diode has the problems of power consumption and time delay, the research of the existing superconducting diode mostly focuses on low-temperature superconducting, low working temperature hinders the application and contradicts with the original intention of low power consumption, and the high-temperature superconducting diode which can work in a liquid nitrogen environment is urgently needed, including geometric, material and physical models. The geometric model is provided with a substrate with a superconductive microbridge strip with an asymmetric structure and metal films at two ends, the physical model contains an external magnetic field and current, and electromagnetic transport characteristics are analyzed through simulation modeling; through geometric structure and material selection and physical model setting, electromagnetic transport characteristics are analyzed by using the corrected RCSJ model, the geometric structure of the superconducting micro-bridge strip is optimized, and the problems of power consumption and speed of an integrated circuit are solved.

The invention relates to a high-temperature superconducting cable and a manufacturing process thereof, and belongs to the technical field of electric wires and cables.The cable comprises a supporting framework, a buffer layer, a three-phase superconducting composite layer, a shielding layer, a heat insulation layer and a sheath layer which are sequentially arranged from inside to outside; the heat insulation layer comprises at least two layers of corrugated pipes formed by continuous rolling and welding, and the corrugated pipes are of periodic concave-convex structures obtained by conducting continuous rolling and side seam welding on metal strips to form closed pipe bodies and then conducting embossing treatment on the closed pipe bodies. A woven reinforcing layer wrapping the peripheries of the corrugated pipes is further arranged in the heat insulation layer, and the adjacent corrugated pipes are connected through supporting pieces to form a vacuum interlayer. According to the application, the corrugated pipe formed by continuous coiling and welding is combined with the combined structure of the braided reinforcing layer and the supporting piece, so that the continuous production of the large-length high-temperature superconducting cable can be conveniently realized, and the problems of axial stress concentration and seam accumulation defects existing in a heat insulating layer of a traditional prefabricated sleeve pipe can be eliminated; and the air tightness stability of the vacuum interlayer of the large-length high-temperature superconducting cable is ensured.

The invention provides a hoisting machinery amplitude variation process energy management method and system based on a supercapacitor, and relates to the technical field of energy management, and the method comprises the steps: calculating the theoretical energy demand of an amplitude variation process through a neural network prediction model, correcting a dynamic grouping coefficient to obtain a power distribution coefficient, and calculating the power distribution coefficient; and taking the result as the upper limit of the charging and discharging power of each group of super capacitors, and adjusting the charging and discharging current through a self-adaptive PI controller. When the amplitude variation angle is reduced, regenerative braking energy exceeding the rechargeable power of the super capacitor is stored in a high-temperature superconducting energy storage inductor, and the energy is charged into the super capacitor according to a power distribution coefficient when the condition is allowed; when the amplitude variation angle is increased, the output power ratio of the main power supply to each group of super capacitors is optimized by adopting a dynamic programming algorithm, and power cooperative control is realized through a sliding mode and an active-disturbance-rejection controller, so that the stability of the system voltage is ensured. The energy utilization efficiency can be effectively improved, the service life of the supercapacitor is prolonged, and the system stability is ensured.

The invention discloses a super-large-scale silicon single crystal growth method based on a high-temperature superconducting magnetic control technology, and relates to the technical field of silicon single crystal growth, and the method comprises the following steps: setting and calibrating an initial magnetic field intensity, and combining a gradient graphite felt heat conductivity coefficient function to optimize temperature field uniformity; a dynamic magnetic field regulation and control mechanism is introduced in the melt stage, melt convection is inhibited through flow velocity-magnetic field joint control, and oxygen concentration monitoring is synchronized; a multi-physics coupling simulation and multi-objective optimization algorithm is adopted in the crystal growth stage, the magnetic field intensity, the heating power and the crystal pulling parameters are adjusted in real time, and the oxygen content and the growth rate are balanced; and the tail stress is relieved through a gradient field reduction technology, and finally, the low-defect and high-uniformity silicon single crystal is obtained. Melt flow and temperature field uniformity are accurately regulated and controlled through a high-temperature superconducting magnetic control technology, dynamic monitoring and a multi-target optimization algorithm are combined, the growth quality of silicon single crystals is remarkably improved, the defect rate and energy consumption are reduced, and meanwhile efficient and stable production of large-size crystals is achieved.

The invention discloses a dynamic load adjustment-liquid nitrogen cold storage integrated high-temperature superconducting power grid capacity expansion system and method. The system comprises a data preprocessing system, a dynamic load adjustment device, a liquid nitrogen cold storage device, a state monitoring device, a high-temperature superconducting cable capacity expansion device and a communication coordination system. The method comprises the steps of generating a standardized feature matrix through normalization processing; multi-time-scale load prediction is realized through an LSTM (Long Short-Term Memory) network, a collaborative instruction set is generated by adopting an optimal scheduling engine of mixed integer linear programming, and adaptive closed-loop control based on a fuzzy PID (Proportion Integration Differentiation) algorithm is realized; a multi-physics field coupling optimization model of a real-time cold energy distribution diagram is adopted to realize power grid capacity improvement; and the time sequence consistency of the whole system is coordinated and circulation is formed. Zero-resistance power transmission is realized in a liquid nitrogen temperature region by adopting the high-temperature superconducting cable, the loss is reduced to 0.5% or below, and the transmission capacity is improved by 3-5 times; the load demand is predicted in combination with the AI algorithm, and the renewable energy consumption rate is increased to 95%.

The present invention provides an appealing, fast, and cost-effective alternative to conventional nuclear fusion reactors. An ultra-compact spherical tokamak that combines three key features aimed at accelerating fusion energy as a viable energy source, these features are spherical type tokamaks, negative triangularity plasma shape and high-temperature superconducting coils. More specifically, the tokamak includes a toroidal vacuum vessel and a magnetic field system configured to confine a high temperature plasma. The magnetic field system includes a solenoid having a sand-hourglass shape; toroidal field coils having an inverse D-shaped design and high temperature superconductor (HTS) material; and poloidal field coils, external to the vacuum vessel. The vacuum vessel has a cross-section with similar inverse D-shape as the toroidal field coils.

The invention provides an attractive, fast and cost-effective alternative method for conventional nuclear fusion reactors. An ultra-compact spherical Tokamak which combines three key features intended to accelerate fusion energy as feasible energy sources, the features being a spherical Tokamak, a negative triangle plasma shape and a high temperature superconductor coil.

The invention belongs to the technical field of high-temperature superconducting detection, and discloses a quench detection sensor based on a high-temperature superconducting material and a detection method.The quench detection sensor comprises an inner layer structure composed of a metal base band, a first insulating layer and a high-temperature superconducting material layer, and a second insulating layer arranged between the metal base band and the high-temperature superconducting material layer; the second insulating layer covers the areas, not at the two ends, of the outer side of the inner layer structure, and a metal base band or a high-temperature superconducting material layer is arranged between the second insulating layer and the first insulating layer; the two ends of the short-circuit connection metal are fixedly connected to the first end of the metal base band and the first end of the high-temperature superconducting material layer respectively; the number of the connecting terminals is two, the two connecting terminals are jointly used for being connected with a detection voltmeter and a detection current source through wires, and the two connecting terminals are fixedly connected to the second end of the metal base band and the second end of the high-temperature superconducting material layer respectively. The quench detection sensor is high in detection reliability.

A bearing and flywheel system can include a first bearing portion having an opening of a first dimension there through and a central longitudinal axis, a second bearing portion having a second dimension, the second dimension being smaller than the first dimension, and a flywheel coupled to the second bearing portion. The bearing portions can include high-temperature superconductor(s) and / or magnets. The second bearing portion can be disposed at least partially within the opening through the first bearing portion. A gap can exist between an outer surface of the second bearing portion and an inner surface of the first bearing portion. The second bearing portion can be configured to rotate relative to the first bearing portion.

The invention discloses a superconducting magnet outer joint welding auxiliary device, which belongs to the technical field of superconducting magnets, and comprises a lifting platform, a concave base, a concave slide way, two groups of bent clamp assemblies, an elastic component, a fastening screw rod and a threaded hole, a concave base is installed above the lifting table, a concave slide way is arranged in the concave base, the concave slide way and the two sets of bent clamp assemblies are installed in a nested and combined mode, and each set of bent clamp assembly is screwed and fixed with a superconducting tape through a screw; the pre-tightening spring is arranged between one side of the concave slide way and one side of the concave base and is matched with the concave slide way to provide tensioning force for the superconducting tape; a threaded hole is formed in the middle of the other side of the concave base. The fastening screw penetrates through the threaded hole and then applies pre-tightening force to the concave slide way. The problems that in the welding process of the high-temperature superconducting magnet, the tensile force needs to be manually provided, and the joint resistance is too large due to the fact that the pre-tightening force is not enough manually provided are solved.

The high-temperature superconducting tape defect detection device comprises a liquid nitrogen tank and a lifter connected below the bottom of the liquid nitrogen tank, a pay-off wheel and a take-up wheel are arranged on the two opposite sides of the liquid nitrogen tank respectively, and an inverted trapezoidal guide wheel set is arranged between the pay-off wheel and the take-up wheel. A high-temperature superconducting strip is released by the pay-off wheel, is guided downwards by the guide wheel set and then is withdrawn upwards by the take-up wheel, four sets of crimping assemblies are arranged on the material supporting base at intervals in the advancing direction of the high-temperature superconducting strip, and the interiors of the two sets of crimping assemblies close to the outside are jointly connected with a current source through wires capable of making contact with the high-temperature superconducting strip. And the inner part is connected with a voltage source. The critical current value of the high-temperature superconducting long belt is measured by adopting a crimping type four-lead method, so that the internal damage position of the belt is intuitively reflected, accurate searching is facilitated, meanwhile, the surface of the belt is prevented from being polluted, the interior of the belt is prevented from being damaged, the detected long belt can be used for the second time or subjected to a surface enhancement process, the detection efficiency is improved, and the manufacturing cost is reduced.

The utility model provides a high-temperature superconducting cable and a high-temperature superconducting magnet. The high-temperature superconducting cable comprises a metal coating layer and a plurality of superconducting sub-cables arranged in an array. The superconducting sub-cable comprises a superconducting conductor extending in the cable extending direction and a heat conduction layer wrapping the periphery of the superconducting conductor, and the periphery of the superconducting conductor is tightly attached to the inner wall of the heat conduction layer. A first attaching part and a first gap part are arranged between the outer walls of the heat conduction layers of the adjacent parts of any two adjacent superconducting sub-cables, and a second attaching part and a second gap part are arranged between the inner wall of the metal coating layer and the outer wall of the heat conduction layer of the closest superconducting sub-cable. The first gap portion and the second gap portion each form at least one cooling channel. The current of the quenched superconducting sub-cable can be shunted to the heat conduction layer of the adjacent superconducting sub-cable through the heat conduction layer, and the heat conduction layer can exchange heat with the cooling liquid of the cooling channel, so that the temperature of the superconducting sub-cable can be quickly reduced to a superconducting interval, and the cable can be prevented from being burnt down due to quenching.

An on-line program control excitation power supply with quench protection for a high-temperature superconducting magnet comprises a single-chip microcomputer for receiving control data, outputting control voltage through digital-to-analog conversion (DAC) of the single-chip microcomputer, and magnetizing a magnet coil through current stepping; a sampling signal is output to the liquid crystal screen to display corresponding voltage and current values in real time after being processed by the single-chip microcomputer analog-to-digital conversion ADC; voltage signals at the two ends of the magnet coil are sampled and returned to the single-chip microcomputer to be processed, when high voltage occurs, it is judged that the voltage signals are abnormal voltage signals, quench protection is carried out, the single-chip microcomputer outputs control signals to cut off connection between the magnet coil and the excitation power source, and residual energy of the magnet coil is released through the high-power thyristor. The provided excitation power supply has the characteristics of high power, high stability, good repeatability and good linearity; performing numerical control stepping output, gradually applying current to the superconducting coil, and slowly establishing a magnetic field; effective quench protection is achieved, and it is guaranteed that a magnet coil is not damaged by quench.

The invention discloses an electromagnetic signal superconducting observation system based on micro-shielding and thermal management and a design method, and the system comprises a high-temperature sensor unit which comprises a pressure-resistant constant-temperature container, a specially-made non-magnetic glass Dewar flask disposed in the pressure-resistant constant-temperature container, and a built-in three-axis high-temperature superconducting sensor. The pressure-resistant constant-temperature container comprises a base body made of carbon fiber reinforced plastics, and a low-frequency frequency-selecting shielding layer, an insulating thin layer, an absorbing layer and a high-frequency shielding layer are sequentially arranged outside the base body. According to the invention, the interference of high-frequency noise in a complex environment and the thermal noise of the three-axis high-temperature superconducting sensor can be significantly reduced. According to the system provided by the invention, the low-noise electromagnetic signal detection of the high-temperature superconducting sensor can be realized in a complex environment, the application range of electromagnetic method technology resource exploration can be widened, and the detection precision can be improved.

The invention discloses a high-sensitivity device and method for measuring high-temperature superconducting microwave surface resistance, and belongs to the technical field of electronics, the device comprises a test seat, a calibration seat, a calibration plate, a supporting plate and a sealing cavity, the test seat comprises a test cavity, a dielectric cylinder, an input coupling structure, an output coupling structure and a dielectric supporting device, the dielectric cylinder is a different-diameter coaxial cylinder and is divided into a supporting column and a resonance column, the supporting column is fixed to the testing cavity through a dielectric supporting device, the tail end face of the resonance column and the bottom end face of the testing cavity are located on the same plane, and the diameter of the supporting column is smaller than that of the resonance column. Therefore, the support column and the test cavity jointly form a cut-off waveguide relative to the required resonant frequency, so that the electromagnetic field is bound around the dielectric column, and the test sensitivity is improved. The invention further provides a double-sided cross test method capable of rapidly testing the microwave surface resistance of the front and back surfaces of the high-temperature superconductor sample to be tested, the system error can be remarkably reduced, and the accuracy and reliability of the test are ensured.

The invention discloses a high-temperature superconducting high-intensity magnetic field homogenization heat treatment method and device for a large-size titanium alloy ingot blank. The adopted device comprises a heating main body structure, a driving assembly, a temperature monitoring and control system and a cooling system. The heating main body structure comprises a supporting frame, an ingot blank rotating clamp, a superconducting coil and an adjustable magnetic core, and the ingot blank rotating clamp is connected with the driving assembly; a temperature monitoring assembly and a control system are arranged outside the ingot blank; the cooling system adopts a liquid nitrogen cooling mode to guarantee stable operation of the superconducting coil. Compared with a traditional titanium alloy heating method, the equipment efficiency can be improved by 82% through the homogenization heat treatment, the heating time is greatly shortened, and the production efficiency is improved. The axial temperature error of the titanium alloy ingot blank can be controlled within + / -3 DEG C, the structure property difference is effectively reduced, and the product quality is improved. The heating depth is increased through low-frequency heating, multiple temperature control modes are achieved in cooperation with a temperature monitoring and control system, and high industrial application value is achieved.

The invention discloses a multi-field coupling fatigue test device and method for a high-temperature superconducting tape, and belongs to the field of superconducting tape fatigue tests.The multi-field coupling fatigue test device for the high-temperature superconducting tape comprises a fatigue testing machine, and a test container used for providing a low-temperature field is arranged in a test area of the fatigue testing machine; a clamp assembly used for fixing a sample to be tested is arranged in the experiment container, the clamp assembly is connected with a current assembly used for providing an electric field, and a magnet assembly used for providing a magnetic field is arranged in the experiment container. According to the multi-field coupling fatigue test device and method for the high-temperature superconducting strip, the limitation of an existing test means is broken through, and a reliable experimental platform and application value are provided for mechanical property research and service life evaluation of superconducting materials and other low-temperature service materials.

The invention discloses the technical field of high-temperature superconducting quantum voltage, and particularly relates to a high-temperature superconducting quantum voltage chip, which comprises a Josephson junction array, and the Josephson junction array comprises a plurality of Josephson junctions. The Josephson junction comprises a polycrystal substrate with different crystal orientation areas, a first superconducting element and a second superconducting element, the first superconducting element and the second superconducting element are distributed on the surfaces of the different crystal orientation areas on the polycrystal substrate, and one end of the first superconducting element is in contact connection with one end of the second superconducting element through a microbridge. The first superconducting element, the second superconducting element and the microbridge are composed of a high-temperature superconducting film which is epitaxially grown on the upper surface of the polycrystal substrate at a time. According to the prepared high-temperature superconducting quantum voltage chip, the two-dimensional thin film only needs to be epitaxially grown for one time to form the high-temperature superconducting Josephson junction array, the integration process is greatly simplified in structure, the characteristic consistency is good, the yield is high, the chip can work at high temperature and is miniaturized and easy to transplant, and real-time voltage calibration is achieved.

The invention discloses a preparation method of a high-temperature superconducting wire strip with high strength, high shunt and high heat-conducting property. The method comprises the following steps: 1, cleaning a semi-finished superconducting wire strip; 2, putting the cleaned semi-finished superconducting wire strip serving as a cathode and a copper electrode serving as an anode into copper sulfate electroplating liquid, and connecting with a direct-current power supply to form an electroplating device; and 3, after electroplating the cathode semi-finished superconducting wire strip, taking out the cathode semi-finished superconducting wire strip and staying in the air, and forming an electroplated layer of nano-scale copper grains by a process of repeatedly electroplating and taking out for multiple times, thereby obtaining the high-temperature superconducting wire strip. According to the invention, the surface of the semi-finished superconducting wire strip is plated with the electroplated layer of the nano-scale copper crystal grains through electroplating, and the high-temperature superconducting wire strip has high strength, high shunting and high heat-conducting properties by utilizing the strong pinning characteristic of the nano-copper crystal grains and the intrinsic high electric conductivity and high heat-conducting characteristics of copper, resists Lorentz force in a strong magnetic field, and has the characteristics of high conductivity and high heat conductivity. And the shunting and heat conduction capabilities of the high-temperature superconducting wire strip after quenching are improved, the process is simple, and industrial production is easy.

A superconducting machine system includes a superconducting electrical machine and a cryogenic vessel encompassing the superconducting electrical machine. The superconducting machine system includes a ramp lead assembly disposed within a vacuum vessel wall and having a first end and a second end. The first end of the ramp lead assembly is coupled in a fixed manner to the vacuum vessel wall and the second end is coupled to a high temperature superconductor power lead coupled to the superconducting switch. The ramp lead assembly includes a non-conductive support and a metal rod. The ramp lead assembly includes a thermal storage device coupled to the metal rod. The thermal storage device is configured to store heat, to limit heat transfer along the metal rod, and to limit an increase in temperature along the ramp lead assembly during the energization of the superconducting electrical machine.

The embodiment of the invention provides a flywheel direct-driven cogeneration unit dynamic adjusting system and a control method thereof, in the embodiment of the invention, a magnetic suspension technology is adopted to eliminate friction of a traditional mechanical bearing, and quick starting and stopping of the rotating speed of a flywheel are realized; the high-temperature superconducting magnetic clutch achieves instantaneous mechanical coupling / decoupling of the flywheel and the circulating pump through the zero resistance characteristic, and the response time is short. The frequency modulation requirement of a new energy power grid can be matched, and meanwhile hard constraint of thermal load fluctuation on electric energy output is avoided. The mechanical direct-drive path directly utilizes the kinetic energy of the flywheel to drive the circulating pump, so that a multi-stage energy conversion link in a traditional mode is omitted; the electric adjusting path realizes bidirectional power exchange between the flywheel and a power grid through an energy interface device, and the loss of an inverter is reduced; and the high-temperature superconducting magnetic clutch realizes zero-energy-loss transmission in a coupling state. The magnetic suspension flywheel set adopts a non-contact suspension technology, so that mechanical wear is eliminated; the high-temperature superconducting magnetic clutch achieves non-contact transmission through magnetic coupling, and friction loss is avoided.

The invention discloses a critical current nondestructive testing device for a joint-free high-temperature superconducting tape. The critical current nondestructive testing device comprises a testing tape reel, a fixing plate, a testing tape reel motor rotating shaft, an air heater, a tension sensor, a wire guide wheel, a magnetizing device, a double-hole Hall sensor, a liquid nitrogen Dewar and the joint-free high-temperature superconducting tape. The test tape reel is used for placing the joint-free high-temperature superconducting tape; the testing tape reel motor rotating shaft is used for connecting the motor and the testing tape reel, and the air heater is used for blow-drying the tape to prevent the surface of the superconducting tape from freezing. The tension sensor is used for carrying out real-time and on-line monitoring on the tension applied to the superconducting tape. The wire guide wheel is of a bearing supporting structure and comprises a built-in deep groove ball bearing or sliding bearing. And the magnetizing device is used for magnetizing the high-temperature superconducting tape. The double-hole Hall sensor can detect magnetic field distribution on the surface of the magnetized strip. The double-hole Hall sensor is provided with a double-hole structure, and the slit strip is detected through the wire passing double holes.

Disclosed in the present application are a method and apparatus for predicting the service life of a superconducting magnet. The method comprises: collecting temperature data of a superconducting magnet, and determining a first service life parameter of the superconducting magnet on the basis of the temperature data (S101); collecting magnetic field intensity data of the superconducting magnet, and determining a second service life parameter of the superconducting magnet on the basis of the magnetic field intensity data (S102); collecting air pressure data of the superconducting magnet, and determining a third service life parameter of the superconducting magnet on the basis of the air pressure data (S103); and performing prediction on the basis of the first service life parameter, the second service life parameter and the third service life parameter, so as to obtain the service life of the superconducting magnet (S104). In the present application, by means of obtaining service life prediction data of a superconducting magnet from different physical fields, a prediction result is more accurate and thus more suitable for predicting the service life of a superconducting magnet of a high-temperature superconducting electrodynamic suspension train in an offline state.

The invention discloses a resistance-type high-temperature superconducting current limiter simulation model building method, which is used for carrying out analogue simulation on a resistance-type superconducting current limiter made of YBCO (Yttrium Barium Copper Oxide) superconducting tape, and comprises the following steps: S1, building an electrical model module of the resistance-type superconducting current limiter; s2, building a thermodynamic model module of the resistance type superconducting current limiter; s3, carrying out iterative circulation on the electrical model module and the thermodynamic model module; and S4, packaging the electrical model module, the thermodynamic model module and the oscilloscope reading module to obtain a resistance-type superconducting current limiter simulation model so as to access a power grid model. According to the invention, analogue simulation of the resistance-type high-temperature superconducting current limiter can be realized, and the resistance-type high-temperature superconducting current limiter can be connected into a simulation power grid for testing.

The invention provides an improved high-temperature superconducting maglev traffic track board assembly which comprises a track board and an adjusting mechanism, and the adjusting mechanism can adjust the height of a track board body. A pair of permanent magnet rails is fixedly connected to the rail plate, a pair of emergency walking plates is fixedly connected to the top face of the rail plate, a traction rail is fixedly connected to the top face of the rail plate, a linear motor can be installed on the traction rail, and a set of large pedestals are arranged below the rail plate body. According to the improved high-temperature superconductive maglev traffic track board assembly, whether the track board body is high in smoothness or not is measured by means of the ball, if the track board body is inclined, the ball slides in the sliding groove and makes contact with the contact, and then the alarm gives an alarm; and then the height of the track board body can be adjusted through the adjusting mechanism, so that the high smoothness of the track board body after installation is improved, and the track board can be widely applied to the technical field of traffic tracks.

A method and device for measuring the magnetic field intensity of a high-temperature superconducting maglev transportation system. The method comprises: determining the upper surface of a permanent magnet track as a magnetic field intensity reference (S1); constructing a chord reference-multi-point chord measurement system to detect irregularities on the upper surface of the permanent magnet track, chord measurement system configurations including a system sampling interval, a system order and a chord measurement configuration (S2); calculating chord measurement values of a plurality of measurement point positions in middle on the basis of the multi-point chord measurement system, and in combination with a least squares method, constructing an inversion model of the measurement system, wherein the inversion model refers to reconstructing an original track irregularity waveform from the chord measurement values of the chord reference, and track irregularities recovered on the basis of the inversion model represent the vertical displacement of the chord reference (S3); on the basis of an optimal chord measurement configuration of the multi-point chord system, determining arrangement positions of gap sensors, and arranging a Hall sensor array in a magnetic field intensity measurement direction (S4); and correcting a reference position on the basis of the vertical displacement of the chord reference, and on the basis of Hall sensor measurement results, using an interpolation method to calculate a magnetic field intensity distribution at any height above the reference (S5). The present invention proposes for the first time to combine a multi-point chord measurement principle to measure magnetic field intensity distribution irregularities of the permanent magnet track in high-temperature superconducting maglev transportation, and the measurement results can be used for evaluating magnetic field intensity irregularities of the permanent magnet track of a high-temperature superconducting maglev transportation system and adjusting the attitude of the permanent magnet track.

The invention discloses a high-temperature superconducting strip with non-uniform distribution of critical current density and a preparation method thereof, and belongs to the technical field of high-temperature superconducting materials. The critical current density of the high-temperature superconducting strip is non-uniformly distributed in the width direction, the current distribution of the high-temperature superconducting strip can be regulated and controlled according to requirements, the high-temperature superconducting strip comprises a high-temperature superconducting layer, the chemical formula of the high-temperature superconducting layer is Re < 1 + a > Ba < 2 + b > Cu < 3 + c > O < 7-d + x% (mol) BaMO3, and Re is selected from Y, Gd, Eu and Sm; m is selected from Hf, Zr and Sn; the preparation method comprises the following steps: depositing the high-temperature superconducting layer on the strip substrate; depositing a metal silver layer on the deposited strip; and carrying out heat treatment on the deposited strip in an oxygen environment, and carrying out laser heat treatment after slitting and / or copper plating. The critical current density of the high-temperature superconducting strip in the width direction is non-uniformly distributed and controllable, the failure risk of the strip is effectively reduced, and the service performance of the strip is improved.

The invention discloses a high-temperature superconducting current lead structure and a preparation method thereof, and relates to the field of high-temperature superconducting material preparation, and the high-temperature superconducting current lead structure comprises a magnetic material tube and a high-temperature superconducting section wrapped in the magnetic material tube; the high-temperature superconducting section comprises a first high-temperature superconducting stack and a second high-temperature superconducting stack, and the first high-temperature superconducting stack and the second high-temperature superconducting stack are arranged in the length direction of the magnetic material tube and are formed by stacking a plurality of high-temperature superconducting strips; the partition plate is used for separating the first high-temperature superconducting stack and the second high-temperature superconducting stack; and one end of the copper plate is simultaneously connected with the same-direction end parts of the first high-temperature superconducting stack and the second high-temperature superconducting stack. By adopting the scheme, an external magnetic field is shielded through the magnetic material tube, and the two high-temperature superconducting strip stacks are separated from the middle through the partition plate, so that the magnetic coupling effect between the two high-temperature superconducting strip stacks is reduced, the critical current of the high-temperature superconducting strip stacks in the self-field is increased, and the test stability and reliability are improved.

The invention discloses a high-temperature superconducting cable refrigeration management method and system combined with a heat transfer mechanism model, and relates to the technical field of refrigeration management, and the method comprises the following steps: carrying out the space structure division of a high-temperature superconducting cable pipeline, and constructing a first structure feature set according to the division result; converting the first structural feature set into a first time sequence according to the liquid nitrogen flow direction, and aligning the first time sequence with a preset reference sequence by adopting a DTW algorithm; based on the alignment result, centrifugal force deviation change gradients of the liquid nitrogen after passing through the multiple pipeline bent sections are extracted, and a centrifugal force deviation gradient curve is constructed; feature extraction is conducted on the centrifugal force offset gradient curve, heat exchange parameters in a preset heat transfer mechanism model are dynamically adjusted according to a feature extraction result, and a corrected heat transfer mechanism model is obtained; and cable temperature prediction is carried out based on the corrected heat transfer mechanism model, refrigeration management is carried out according to a prediction result, and the problem of uneven local heat load caused by flow deviation of the bending section is solved.

The invention discloses a preparation method of Bi-2212 precursor powder capable of remarkably improving the phase density of Bi-2201 nanometer stripes in a Bi-2212 wire rod, and the Bi-2212 precursor powder capable of remarkably improving the phase density of the Bi-2201 nanometer stripes in the Bi-2212 wire rod is obtained by controlling the components of a precursor solution, adjusting in cooperation with a fine heat treatment method and controlling the molar ratio of Sr to Ca. According to the method disclosed by the invention, the components of the precursor solution are controlled, the large-size Bi-2201 phase is eliminated in combination with heat treatment, and the molar ratio of powder Sr to Ca is controlled to be within a proper range, so that the density of the nano stripe Bi-2201 phase in the Bi-2212 wire rod is improved, and the pinning performance of the Bi-2212 wire rod is favorably improved; the method is easy to operate, low in cost and high in controllability and operability, the cost performance of the Bi-2212 superconducting wire is improved, and rapid application of the Bi-2212 superconducting wire in the field of high-temperature superconducting magnets is further promoted.