119 results about "High field" patented technology

The invention belongs to the technical field of superconducting wires, and relates to a niobium-tin composite superconducting wire and a preparation method thereof. The invention provides a Nb3Sn composite superconducting wire. The Nb3Sn composite superconducting wire sequentially comprises an Nb3Sn superconducting wire core, a barrier layer, a stable layer, a transition layer, a substrate layer and a functional layer from inside to outside, the transition layer is formed by mixing copper and a dielectric polymer, and the copper content is continuously decreased in a gradient manner from inside to outside; the substrate layer is the dielectric polymer; the functional layer is a plurality of protruding metal microstructures. According to the invention, the functional layer with the broadband electromagnetic stealth function is integrated on the basis of the Nb3Sn superconducting wire rod, so that the radar cross section is obviously reduced while the Nb3Sn superconducting wire rod bears high-density superconducting current and generates a strong magnetic field, and the technical problem that a high-field superconducting magnet system is easy to detect in an electromagnetic environment is solved.

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 discloses an internally-inserted water-cooled magnet device for a high-field hybrid magnet. The internally-inserted water-cooled magnet device comprises a container assembly and a magnet coil assembly arranged in the container assembly. The container assembly comprises an upper barrel assembly, a container end cover, a hydraulic machine assembly, a center pipe assembly, an inner supporting assembly, a middle barrel assembly, a lower barrel assembly and an electric connecting assembly. The hydraulic machine assembly comprises a cylinder body, a piston, a check ring, a pressure equalizing pad, a first force transmission check ring, a first anti-rotation pin, a second force transmission check ring, a second anti-rotation pin, a first force transmission column and a second force transmission column. The axial force application device has the advantages that axial force application can be performed on the magnet coil assembly, the pressing force on the magnet coil assembly is improved, and the problems of tension fracture and damage caused by coil stress overrun due to overlarge radial expansion electromagnetic force of a magnet coil bit piece and an insulating piece are solved.

The invention discloses a high-field water-cooling magnet device which comprises a container assembly and a magnet coil assembly, and the magnet coil assembly is located in the container assembly and communicated with the container assembly. The container assembly comprises a hydraulic machine assembly, and the hydraulic machine assembly comprises a cylinder body, a piston, a check ring, a pressure equalizing pad, a first force transmission check ring, a first anti-rotation pin, a second force transmission check ring, a second anti-rotation pin, a first force transmission column and a second force transmission column. The axial force application device has the advantages that axial force application can be performed on the magnet coil assembly, the pressing force on the magnet coil assembly is improved, and the problems of tension fracture and damage caused by coil stress overrun due to overlarge radial expansion electromagnetic force of a magnet coil bit piece and an insulating piece are solved.

The invention relates to the technical field of superconducting material processing, in particular to a preparation method of an Nb3Sn superconducting wire. The method mainly comprises the steps that Nb-Zr alloy is loaded into the exterior and / or the center of a Sn-Cu single-core rod, oxide powder is filled between the Nb-Zr alloy and the Sn-Cu single-core rod, then the Sn-Cu single-core rod and the Nb-Zr alloy are loaded into a copper substrate, and Nb3Sn subcomponents are obtained after multi-pass stretching, forming and fixed-length cutting; and uniformly arranging the Nb3Sn sub-components in the copper pipe along the circumferential direction to form a bundle, and after multi-pass stretching, carrying out heat treatment and cutting to obtain the Nb3Sn superconducting wire. By introducing the artificial point pinning array in density gradient distribution, the critical current density of the Nb3Sn superconducting wire in a high magnetic field of 8T-16T is enhanced, the problems that an existing uniform artificial point pinning center scheme generates a matching effect and limits the actual application of the superconducting wire are solved, and the decline degree of the critical current density of the Nb3Sn superconducting wire in the high field is relieved.

Disclosed is a system comprising a database storing a preoperative high-resolution image of an object of interest and a control circuit. The control circuit comprises a processor and a memory. The memory stores instructions executable by the processor to obtain a low-field strength magnetic resonance image of the object of interest. The memory stores further instructions executable by the processor to input the low-field strength MRI of the object of interest into a generator model of a pre-trained generative adversarial network. The generator model is pre-trained with low-field strength MRIs and paired high-resolution images to correct image distortions. The memory stores further instructions executable by the processor to output a distortion-corrected image of the object of interest from the generator model based on the low-field strength MRI and transmit the distortion-corrected image of the object of interest to a user interface.

The invention discloses a decoupling method based on high-field solid-state nuclear magnetic resonance T2 relaxation, and the method comprises the steps: carrying out the preprocessing of a collected T2 relaxation signal, including data conversion, chemical shift sorting, normalization processing and signal screening; converting the time domain signal into a frequency domain model by adopting inverse Laplacian transformation, and extracting pole features; on the basis of frequency domain pole information, automatic estimation and nonlinear fitting of signal parameters are achieved through radial basis function fitting in combination with a numerical optimization algorithm; and storing the processed time domain signal data. The method innovatively solves the technical problem of multi-atomic-nucleus relaxation signal analysis under the high-field condition, has the advantages of high signal-to-noise ratio, good analysis precision, wide application range and the like compared with a traditional low-field nuclear magnetic technology, and is particularly suitable for research and analysis in the fields of energy materials, catalysts and the like. And the processing capability and the decoupling effect of the high-field solid-state nuclear magnetic resonance relaxation signal are remarkably improved through technologies of system integration signal conversion, parameter optimization, regularization processing and the like.

Techniques are described for lowering strains applied to superconducting material in a superconducting magnet by arranging structural partitions between turns of the superconducting material that intercept and transfer strain to a mechanically stronger structure, such as the housing of the magnet. A structural partition may be formed with a feedthrough slit so that the superconducting material can easily pass through the partition. A number of structural partitions may be interspersed between groups of turns of superconducting material in a magnet so that forces can be sufficiently distributed by the partitions throughout the magnet. At the same time, the number of structural partitions may be selected to minimize the amount of space within the magnet occupied by the partitions that could otherwise be occupied by current-carrying superconducting material.

The invention belongs to the technical field of superconducting materials, and discloses an internal tin method Nb3Sn superconducting wire integrated with a piezoelectric sensing function and a preparation method of the internal tin method Nb3Sn superconducting wire. According to the method, a piezoelectric functional layer and a dielectric layer are prepared on the surface of a SnAl alloy rod, a CuAg alloy rod is installed after drilling to form a composite rod, the composite rod is inserted into an inner tin method Nb3Sn / CuNb composite pipe to be drawn into a subcomponent, then the subcomponent is bundled and installed into a Ta pipe and an oxygen-free copper pipe, and the wire is prepared through multiple times of stretching. The piezoelectric functional layer can convert micro strain into measurable electric signals, in-situ real-time monitoring of mechanical stress and the like in the wire rod is achieved, the CuAg alloy bar can stabilize the tensile strength of the wire rod and promote generation of an Nb3Sn phase, and on the premise that the superconducting performance is not affected, the operation reliability and safety of the high-field magnet under the extreme working condition are improved.

The invention provides a niobium rod for an Nb3Sn superconducting wire niobium material and a preparation method of the niobium rod, and the preparation method of the niobium rod comprises the following steps: a, upsetting and drawing forging: carrying out n times of upsetting and drawing forging on a niobium cast ingot, n is any integer in 2-5, and carrying out annealing heat treatment in a gap between two times of upsetting and drawing forging or after the last upsetting and drawing forging, the upsetting and drawing forged round bar is obtained; b, radial forging is conducted, specifically, the upsetting and drawing forging round bar is subjected to radial forging; and c, rotary forging: carrying out rotary forging on the rod blank subjected to radial forging. The niobium rod prepared by the method meets one or more of the following items: the grain size is 7-8 grades, the elongation at break is greater than or equal to 40%, and the hardness (HV / 2.9 N) is greater than or equal to 40 and less than or equal to 65. Namely, the niobium rod prepared by the preparation method has at least one of the characteristics of uniform and fine grains, low hardness and high plasticity, and the comprehensive performance of the niobium rod is improved, so that the strict requirements of the Nb3Sn superconducting wire on the base material in high-field magnet application are met.

The invention relates to the technical field of nuclear magnetic resonance, and provides a broadband tuning system for a high-field nuclear magnetic resonance coil. The system comprises a radio frequency coil, a radio frequency shielding layer and a driving mechanism, the radio frequency shielding layer and the radio frequency coil are coaxially arranged in the axial direction, and the radial size of the radio frequency shielding layer is larger than that of the coil. The driving mechanism drives the radio frequency shielding layer and the radio frequency coil to generate axial relative movement, so that the axial overlapping length between the radio frequency shielding layer and the radio frequency coil is continuously changed. According to the system, the electromagnetic coupling strength between the radio frequency shielding layer and the radio frequency coil can be adjusted through mechanical displacement, then the equivalent inductance of the coil is changed, and finally continuous and broadband tuning of the resonant frequency of the coil is achieved. According to the invention, traditional capacitance tuning is replaced by pure physical mechanical adjustment, so that the physical limitation and parasitic effect of micro capacitance in a high field are effectively avoided, the uniformity of a radio frequency magnetic field is maintained on the premise of not changing the structure of the coil, and the compatibility and stability of high-field and multi-core detection are effectively improved.

The present invention belongs to the field of medical image processing, and particularly relates to a semi-supervised automatic segmentation method for hippocampal subregions based on ultra-high field 7T magnetic resonance image synthesis. The method includes obtaining 3T magnetic resonance images and 7T magnetic resonance images and performing preprocessing; processing the 3T magnetic resonance images by using a trained image generation model to generate 7T magnetic resonance images; processing the 7T magnetic resonance images by using the first 3D U-Net network cascaded in a trained image segmentation model to extract multi-scale rough segmentation results of the 7T magnetic resonance images; and processing the multi-scale rough segmentation results of the 7T magnetic resonance images by using the second 3D U-Net network cascaded in a trained image segmentation model to extract fine segmentation results of the 7T magnetic resonance images. The present invention can improve the accuracy of the segmentation network and automatically segment 7T magnetic resonance images.

The application discloses a method for improving critical current of REBCO superconducting layer and relates to the technical field of superconducting materials.The method for improving critical current of REBCO superconducting layer comprises the following steps: REBCO superconducting tapes are annealed in a pure oxygen atmosphere, quenched to 20-25 DEG C, and then the surface silver layer is removed by a chemical method, after which the REBCO superconducting tapes are annealed in a mixed atmosphere of ozone and oxygen, and a protective layer is deposited, so that the critical current of the REBCO superconducting layer is finally improved.The carrier concentration of the REBCO superconducting tapes can be effectively controlled through the specific multi-step oxidation process, so that the REBCO superconducting tapes break through the under-doped state commonly existing in the prior art, reach the over-doped level, and then the critical current performance of the tapes is significantly improved.The method has simple process, high stability and high industrial feasibility, and can meet the demand of higher current-carrying capacity of REBCO tapes in key fields such as power transmission and high-field magnets.

The invention provides a superconducting magnet quench protection system and method, and relates to the technical field of superconducting magnets, the superconducting magnet quench protection system comprises: an energy release assembly comprising a first superconducting coil and a second superconducting coil connected in series with the first superconducting coil; the heating assembly is configured to release oscillation currents in opposite directions to the first superconducting coil and the second superconducting coil at the moment that the first superconducting coil and the second superconducting coil quench, and coupling loss is generated in the first superconducting coil and the second superconducting coil so as to heat the first superconducting coil and the second superconducting coil. And converting the first superconducting coil and the second superconducting coil from a superconducting state to a normal state. The superconducting magnet quench protection system can solve the problems of high field intensity, large energy storage and difficult quench protection of a wire slot type superconducting magnet.

The invention relates to the technical field of ultra-low field magnetic resonance systems, in particular to a battery charge state detection method and system based on closed-loop adaptive ultra-low field MRI, and the method comprises the steps: collecting the phase change of a water molecule H signal caused by the magnetic field disturbance of a to-be-detected battery, and reconstructing a first signal phase image; extracting to obtain a high-information-content area mask, and then performing resampling to obtain a second signal phase image; and inputting the second signal phase image into a state-of-charge detection model to predict a state-of-charge value of the to-be-detected battery. In order to solve the problem that a battery magnetic resonance detection scheme in the prior art needs to adopt a high-field magnetic resonance system and is not beneficial to production line use, detection equipment is replaced with an ultralow-field magnetic resonance system, so that structures such as a shielding room in a traditional magnetic resonance system are omitted, and a high-information-content area is positioned firstly, so that the detection efficiency is improved; and resampling is carried out on the region, so that the imaging precision is improved, and the accuracy of state of charge estimation of the detection model is improved.

The invention discloses a radio frequency superconducting material performance testing system and a surface resistance measuring method.The radio frequency superconducting material performance testing system comprises a radio frequency cavity module, a low temperature module and a measuring module, the radio frequency cavity module comprises a mushroom-shaped superconducting cavity, the inner wall of the superconducting cavity is plated with a Ni3tin film, and the inner wall of the superconducting cavity is plated with a Ni3tin film; the low-temperature module is provided with a multi-stage cooling structure and a magnetic shielding shell. The measuring module is used for collecting the sample temperature, the magnetic field, the vacuum degree, the radio frequency power and the direct-current power of the heater. According to the radio frequency superconducting material performance testing system, by optimizing the design of the mushroom-shaped cavity and adopting the Nb3Sn coating technology and the efficient conduction cooling low-temperature module, the dependence of a traditional radio frequency material testing system on a liquid helium low-temperature system is eliminated, a compact testing platform is formed, and high-field and high-resolution measurement of the surface resistance of an SRF material is achieved.

The present invention belongs to the technical field related to refrigeration and cryogenic containers, and discloses a eddy-current-free liquid helium cryostat for use in a pulsed high-magnetic field environment. The cryostat comprises a sample rod, a helium chamber, a liquid nitrogen layer, a vacuum chamber, and a tail pipe. The tail pipe is composed of an inner epoxy tail pipe and an outer epoxy tail pipe, each of which is mounted via metal flanges. The epoxy tail pipe and the metal flanges are bonded together with epoxy sealant. The vacuum interlayer between the helium chamber and the vacuum chamber is interconnected with the vacuum interlayer between the inner epoxy tail pipe and the outer epoxy tail pipe. In addition, the metal flange of the inner tail pipe is precisely mounted concentrically from top to bottom, and a removable metal seal is achieved between the metal flange of the inner tail pipe and the bottom flange of the helium chamber. The present invention effectively solves the problem of liquid helium loss caused by Joule heat generated by induced eddy currents in a pulsed high-magnetic field environment in the prior art, while significantly improving the measurement accuracy of scientific experiments in a high-field pulsed high-magnetic field environment.

The invention discloses a preparation method of an in-situ Ag NWs fiber reinforced Cu-Ag alloy wire. The method comprises the following steps: 1, synthesizing Ag NWs in situ based on a liquid phase polyol method; 2, preparing a pre-dispersed Ag NWs fiber solution; 3, Cu powder is poured into the pre-dispersed Ag NWs fiber solution to be stirred and dried; 4, performing heat treatment to obtain Cu / Ag NWs composite powder; 5, performing spark plasma sintering to obtain a Cu / Ag NWs composite bar; and sixthly, cold drawing machining is conducted after tubing. Through in-situ synthesis of Ag NWs, mixing, sintering and drawing deformation processes, a microstructure of a large-length-diameter-ratio Ag NWs fiber reinforced submicron copper matrix is constructed from the angles of low Ag content, avoidance of grain growth and reduction of electron scattering, and a Cu-Ag alloy wire with good strength and conductivity matching is obtained under the low Ag content; the magnet is suitable for the fields of electronic communication, power transmission, high-field pulse magnets and the like.

This invention belongs to the field of superconducting materials technology and discloses an internal tin-based Nb3Sn superconducting wire with integrated piezoelectric sensing function and its preparation method. The method involves preparing a piezoelectric functional layer and a dielectric layer on the surface of a SnAl alloy rod, drilling a hole, inserting a CuAg alloy rod to form a composite rod, inserting it into an internal tin-based Nb3Sn / CuNb composite tube, drawing it into sub-components, and then bundling them into a Ta tube and an oxygen-free copper tube. The wire is then obtained through multiple stretching operations. The piezoelectric functional layer can convert minute strains into measurable electrical signals, enabling in-situ real-time monitoring of internal mechanical stresses within the wire. The CuAg alloy rod can stabilize the tensile strength of the wire and promote the formation of the Nb3Sn phase, improving the operational reliability and safety of high-field magnets under extreme conditions without affecting superconducting performance.

An optically controlled, multi-transmitter magnetic resonance imaging system for multi-nuclear, high field applications is disclosed. In one embodiment, the MRI system may include a dual-tuned radio-frequency (RF), on-coil power amplifier for amplifying RF power signals at two or more frequencies for the multi-nuclear excitations for use in a dual-tuned coil MRI device or a nested coil MRI device. In one particular implementation, the dual-tuned amplifier of the MRI system may receive optical carrier signals through the broadband optical interface to control the on-coil amplifiers. A variable effective inductor circuit for use in tuning the dual-tuned amplifier is also disclosed. The variable effective inductor circuit includes a gallium nitride (eGaN) field effect transistor (FET) device connected to an inductor. The inductance of the variable effective inductor circuit can be adjusted by modulating a drain-source voltage of the eGaN FET device controlled based on a pulse duration of an optical carrier signal.

The present invention discloses an axial reinforcement device for a high-field pulse magnet, which belongs to the field of pulsed high magnetic field technology; the reinforcement device includes an end assembly and an internal fixing assembly; wherein the end assembly includes two parallel end plates, which are parallel to the radial plane of the pulse magnet coil and are respectively arranged at both ends of the pulse magnet coil; the internal fixing assembly is perpendicular to the end plate of the end assembly, and its main body is arranged between the two end plates of the end assembly, and is located at an interface position inside the magnet coil where free separation between coil layers will occur. After the magnet coil is wound or assembled to a predetermined step, the internal fixing assembly is arranged to clamp the two end plates of the end assembly to provide additional axial pre-tightening force for the end plates; the present invention can effectively reduce the axial gap between the coil turns caused by the circumferential pre-tightening force on the coil during the winding or assembly process of the magnet coil, thereby reducing the axial gap between the magnet end coil and the end plate when the magnet is discharged, thereby improving the service life of the magnet.

The application relates to a field effect transistor and a power electronic system. The field effect transistor comprises a substrate, a channel layer formed on the substrate, a barrier layer formed on the channel layer, a two-dimensional electron gas channel formed between the barrier layer and the channel layer, a source electrode, a gate electrode and a drain electrode formed on the barrier layer and arranged in sequence at intervals along a first direction, a P-type compensation island at least partially higher than the barrier layer and located between the gate electrode and the drain electrode, the P-type compensation island being spaced apart from the drain electrode and the gate electrode, a shielding plate located above the P-type compensation island, a passivation layer arranged between the shielding plate and the P-type compensation island, and the shielding plate being arranged at intervals from the gate electrode and the drain electrode. Through the coupling effect of the P-type compensation island and the shielding plate, the potential distribution between the gate electrode and the drain electrode is more uniform, thereby reducing the peak value of the high field on the drain side, improving the breakdown margin, and effectively reducing the virtual gate effect caused by electron capture after high-voltage turn-off, thereby greatly reducing the increase of the dynamic on-resistance.

The invention relates to the technical field of magnetic resonance imaging, in particular to an intra-operative low-field magnetic resonance intelligent navigation method based on preoperative high-field data guidance, which comprises the following steps: acquiring a high-field MRI image of a patient before an operation and extracting a three-dimensional segmentation mask and clinical features of a focus; adjusting according to the clinical features to obtain an intraoperative scanning protocol; and performing low-field magnetic resonance examination during the operation to generate an intra-operation navigation image, and marking focus information. Aiming at the problem that the accuracy of a focus image provided by an ultra-low field system in the operation process in the prior art is not enough, a high-field MRI image collected before the operation is introduced as a reference, scanning sequence parameters of the ultra-low field system used in the operation are dynamically adjusted based on clinical features embodied in the high-field MRI image, a better imaging effect is achieved, and meanwhile, the accuracy of the focus image provided by the ultra-low field system in the operation process is improved. Focus information is marked on the intraoperative navigation image based on the three-dimensional segmentation mask as prior information, so that more refined segmentation of focuses on the intraoperative navigation image is realized, and the surgical requirements are met.

The application provides a radio frequency coil applied to a magnetic resonance imaging device, which comprises a plurality of loop-shaped coil units, the plurality of coil units are distributed in a circumferential direction around a preset axis and are sequentially connected; a plurality of feed ports corresponding to the coil units, the feed ports are arranged on the corresponding coil units; and a plurality of capacitors, at least one capacitor is coupled to each coil unit. Through the above configuration, the capacitors are arranged to adjust the circuit characteristics of the coil units; compared with the prior art, the plurality of coil units and the corresponding plurality of feed ports can increase the number of channels of the radio frequency coil to be greater than four, so that the radio frequency coil can be applied to a high-field or ultrahigh-field transmitting coil; in addition, the cooperation of the plurality of coil units and the plurality of feed ports can also improve the shimming of the radio frequency coil.

The present invention belongs to the field of high-temperature superconducting materials and particularly relates to a gadolinium ytterbium barium copper oxide superconducting film and a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing a solution containing 2-thenoyltrifluoroacetone; S2, adding gadolinium oxide and ytterbium oxide to react with nitric acid to obtain a mixed solution containing gadolinium nitrate and ytterbium nitrate, mixing the solution obtained in S1 with the mixed solution, adding seed crystals to react, standing, separating and drying to obtain a gadolinium ytterbium coordination complex; S3, mixing the gadolinium ytterbium coordination complex obtained in S2, a barium source, a copper source and a solvent, and growing the gadolinium ytterbium barium copper oxide superconducting film on a substrate surface by an organometallic chemical vapor deposition method using oxygen as an oxygen source; the molar ratio of gadolinium nitrate to ytterbium nitrate is (0.7-0.78):(0.22-0.3). The gadolinium-ytterbium coordination complex prepared by the invention has good volatility and high thermal stability; the generated film has few impurities and holes, a smooth surface, and excellent electrical and magnetic field properties at low temperature and high field.

This invention relates to the field of superconducting material processing technology, specifically to a method for preparing Nb3Sn superconducting wires. The invention mainly involves inserting an Nb-Zr alloy into the exterior and / or center of a Sn-Cu single-core rod, filling the space between the Nb-Zr alloy and the Sn-Cu single-core rod with oxide powder, and then inserting it into a copper substrate. After multiple passes of stretching, forming, and length-cutting, Nb3Sn sub-components are obtained. These Nb3Sn sub-components are then uniformly arranged circumferentially within a copper tube to form a bundle, followed by multiple passes of stretching, heat treatment, and cutting to obtain the Nb3Sn superconducting wire. This invention enhances the critical current density of the Nb3Sn superconducting wire under high magnetic fields of 8T–16T by introducing an artificially pinned array with a density gradient distribution. This solves the problem of the matching effect produced by existing uniform artificially pinned center schemes, which limits the practical application of superconducting wires, and alleviates the decrease in critical current density of Nb3Sn superconducting wires under high fields.

A low field MRI instrumental system includes: an electromagnetic Radio Frequency antenna to emit RF pulses for inducing Electron Paramagnetic Resonance; an electromagnetic Low Frequency antenna for measurements, to emit LF pulses for inducing Nuclear Magnetic Resonance, respectively to receive LF signal produce by NMR; a gradient generator, to create a gradient in a static magnetic field generated during measurements; a high field generator to generate a strong pre-polarization magnetic field for magnetic pre-polarization; and, a control / command unit. This low field MRI instrumental system further includes a low field unit to generate a low static magnetic field whose direction is adjustable along the three directions X, Y and Z of a fixed reference frame associated with the low field MRI instrumental system.

The invention discloses a method for preparing a REBCO-NbTi-REBCO mixed superconducting joint through brazing, and belongs to the technical field of superconducting, and the method comprises the following steps: (1) NbTi wire pretreatment and welding section preparation, (2) REBCO-NbTi horizontal welding, and (3) REBCO-NbTi-REBCO annular structure joint welding. According to the manufacturing method, a REBCO-NbTi-REBCO sandwich welding structure is adopted, the problem of poor contact caused by geometrical morphology difference of REBCO strips and NbTi wires is solved, mutual inductance interference is eliminated, only NbTi coil self-inductance is reserved, the resistance of the obtained connector reaches the magnitude of 10 ohms, the application requirements of the fields such as high-field magnets can be met, and the manufacturing method is easy to operate, controllable in cost and suitable for industrial production. And a technical support is provided for the engineering application of the REBCO-NbTi mixed superconducting joint.

The invention relates to a comprehensive recycling method of gold ore cyaniding slag. The method comprises the following steps: (1) primary ore grinding; (2) primary and secondary ultrahigh field intensity magnetic separation pre-enrichment; (3) concentrate grading fine grinding and leaching while grinding; (4) cyaniding all mud to extract gold and silver; (5) collecting iron through third-fourth stage medium-intensity magnetic separation; (6) deep decyanation by an inconel method; and (7) refining gold and silver and casting ingots. According to the method, the system process of ultrahigh field intensity magnetic separation pre-enrichment, graded ore grinding and leaching while grinding, all-mud cyanidation gold and silver extraction, medium-intensity magnetic separation iron recovery and inconel method deep decyanation is adopted, comprehensive recovery of gold, silver and iron is achieved, and the recovery rate and the grade are far superior to those of a traditional process; and meanwhile, light weight of cyanidation tailings stockpiling and deep decyanation of high-cyanide-content tailings are realized, four industrial pains of insufficient dissociation, low iron recovery rate, poor product quality and high environmental risk of tailings in the traditional process are overcome, and synchronous improvement of resource recovery rate, economic benefit and environmental benefit is realized.

The invention relates to a transmitting coil. The transmitting coil comprises two end rings and a plurality of coil crosspieces, wherein the plurality of coil crosspieces are arranged between the two end rings; the structure of each coil crosspiece comprises a first dielectric layer, a plurality of first metal layers and a plurality of second metal layers, the plurality of first metal layers are distributed and attached to one side of the first dielectric layer, and the plurality of second metal layers are distributed and attached to the other side of the first dielectric layer; and each first metal layer and the second metal layer at the corresponding position of the other side of the first dielectric layer form a capacitor. By using the transmitting coil provided by the invention, the specific absorption rate (SAR) in high-field magnetic resonance scanning can be reduced.