20 results about "High field" patented technology

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.

This invention discloses a magnetic array-enhanced non-metallic alkaline water hydrogen production electrolyzer, which is constructed by stacking and sealing anode plates, cathode plates, and electrolytic bipolar plates with gaskets and diaphragms layer by layer. Each anode plate, cathode plate, and electrolytic bipolar plate includes a non-metallic frame, a graphite liner, a cylindrical permanent magnet array, and nickel foam electrodes. The magnet array is positioned between the graphite liner and the nickel foam electrodes. The electrolytic bipolar plates and end plates enclose an electrolysis chamber, and the number of bipolar plates can be increased or decreased as needed. This invention utilizes a cylindrical permanent magnet array to construct a high-field, strong gradient magnetic field, leveraging oxygen paramagnetism to achieve efficient bubble desorption and enhance the oxygen evolution reaction rate. A star-shaped flow field structure fills the gaps in the magnet array, optimizing electrolyte distribution and enhancing mass transfer efficiency, effectively improving the hydrogen production performance and electrolysis efficiency of the electrolyzer.

The application belongs to the technical field of superconducting materials, and particularly relates to a superconducting composite wire and a preparation method thereof. The application provides a superconducting composite wire, which comprises, from inside to outside, an inner tin method Nb3Sn sub-element, a thermal sensitive phase change barrier layer, a Cu-Mn-Ni high-damping copper alloy stabilizing layer, a thermochromic warning coating and an outer insulating sheath. The application can be widely applied to high-field magnets in fusion reactors, high-energy accelerators and advanced MRI systems, and can significantly improve the operation safety and state monitoring capability.

The application discloses a traveling wave antenna unit, an array and a method for improving high-field magnetic resonance radio frequency field uniformity, relates to the field of magnetic resonance imaging, and aims to improve high-field magnetic resonance radio frequency field uniformity. The application increases the component of the wave number of the traveling wave antenna unit in the traveling wave transmission line direction in the traveling wave antenna array through physical or chemical means to relieve the radial standing wave effect. The traveling wave antenna unit comprises a layer-by-layer designed metal microstrip, a first bearing substrate, a filling layer substrate, a slotted metal floor, a second bearing substrate and a spacing layer substrate. A feeding port is connected between the first end of the metal microstrip and the slotted metal floor, and a load is connected between the second end of the metal microstrip and the slotted metal floor. The filling layer substrate is a fillable structure. The component in the traveling wave transmission line direction is increased by increasing the relative dielectric constant of the filling medium or changing the slotted structure. The application is simple in design, convenient in operation and does not need additional hardware.

This invention belongs to the technical field of high-field magnet structure design, specifically involving an adaptive selection method for simulation type in pulse magnet structure design. The method includes: establishing a model of the pulse magnet; using a circuit model to calculate the actual current waveform of the magnet at the required power supply voltage; importing this waveform into an electromagnetic finite element model to calculate the peak electromagnetic load of the magnet; applying this load as a single step load to the structural finite element model; extracting the stress-time curve of each target component; and extracting the fundamental component of this curve using Fourier transform to determine the natural vibration frequency of the component. ω m Perform a Fourier transform on the actual current waveform to determine its fundamental component. ω i If all target components ω m All are greater than N × ω i If a steady-state simulation evaluation is selected, then this invention can solve the problem of the lack of a standardized operating system in the existing pulse magnet structure design that can reasonably use static analysis results to approximate transient analysis results.

This invention discloses a low-temperature and high-temperature superconducting hybrid toroidal field magnet for thermonuclear fusion devices, relating to the field of magnetic confinement fusion technology. The invention proposes placing second and first toroidal reinforcing support structures between radially graded high-field, mid-field, and low-field windings, respectively. These structures are made of high-strength stainless steel (such as N50, JJ1, JK2LB, or reinforced 316LN) with a yield strength >1000 MPa and permeability <1.05 at extremely low temperatures. This provides an internal rigid framework that effectively resists toroidal compression, significantly reduces shear forces on the insulation material within the coil windings, and increases the design upper limit of the toroidal field magnet. Simultaneously, it allows for a reduction in the thickness of the nose region of the coil housing, saving extremely valuable radial space in the center of the device. This invention, combined with the graded use of superconducting materials, achieves a highly efficient balance between device economy and performance.

The application discloses a method for high-resolution functional imaging in a high-field magnetic resonance system. The method comprises the following steps: S1, determining a two-dimensional spatially selective radio frequency pulse sequence applied to a brain of a subject organism, the two-dimensional spatially selective radio frequency pulse sequence is used for reducing a field of view (FOV) in a phase encoding direction and not generating signal folding. Preferably, the method further comprises the following step: S2, performing under-sampling and reconstruction on K-space based on an EPI-based GRAPPA algorithm. The application has the beneficial effect of realizing high-resolution functional imaging in a high-field magnetic resonance system.

This invention provides a magnetic resonance receiving device suitable for auditory stimulation of awake marmosets, relating to the field of receiving coil design for magnetic resonance imaging. It includes an animal bed, a head fixation assembly, and a body shell. The animal bed has a placement slot; the head fixation assembly includes a mandibular support and a head shell, the mandibular support being detachably disposed in the placement slot, the head shell being detachably disposed above the mandibular support, and the body shell being detachably disposed on the animal bed; the head shell contains multiple radio frequency coils; both the mandibular support and the two side walls of the head shell have through slots for inserting auditory stimulation tubing. This invention, through the integrated design of radio frequency coils, a head fixation assembly, and an auditory stimulation-compatible interface, enables high-quality neuroimaging and precise simultaneous auditory stimulation experiments in an ultra-high field magnetic resonance environment.

The application provides a magnetic resonance radio frequency transmitting system and a magnetic resonance system radio frequency safety monitoring method, wherein the forward power and / or the reverse power of each coil loop of a transmitting coil is measured through a directional coupler, the coupling current of each coil loop of the transmitting coil is measured through a coupling probe, and the power loss of the transmitting coil is determined according to the forward power, the reverse power and the coupling current of each coil loop, so that the specific absorption rate corresponding to a scanning sequence is determined, and the accuracy of radio frequency safety monitoring of the magnetic resonance radio frequency transmitting system is improved. In addition, the application solves the problem that the power loss of the transmitting coil in the magnetic resonance radio frequency transmitting system is difficult to measure due to the change of the transmitting amplitude and phase of each coil loop, and the real patient absorption power is more accurately obtained, so that the radio frequency safety of the patient in the super-high field multi-channel transmitting magnetic resonance system is ensured.

This application relates to a method, apparatus, computer device, and readable storage medium for magnetic resonance image correction. The method includes: acquiring the receiving field sensitivity of a receiving coil in a magnetic resonance device; determining the positional relationship between the receiving coil in the magnetic resonance device and the region of interest (ROI) of the target object; determining the receiving signal sensitivity of each point in the imaging region where the ROI is located based on the positional relationship and the receiving field sensitivity; generating a corrected image of the corresponding imaging region based on the receiving signal sensitivity of each point; and correcting the initial magnetic resonance image of the ROI using the corrected image to obtain the target magnetic resonance image. This method can improve the uniformity of brightness distribution in high-field magnetic resonance images.

A novel capacitive micromachined ultrasonic transducer (CMUT) array is provided and the CMUT array employs an additional electrically-addressable conductive shield that isolates each array element individually, hence the novel array is coined as Faraday Caged CMUT array. The state of this conductive shield corresponding to each array element can be set as floating for reduced parasitic and cross-coupling capacitance or grounded for reduced electrical crosstalk. Perpetual, reliable operation in floating state without the risk of catastrophic dielectric electric field breakdown event is enabled by the self-discharging mechanism through diamond emitters featuring high field emission efficiency and acting as lightning rods in a cavity. The lightning rod structure features a movable diamond membrane, which deflects towards the diamond emitter due to electrostatic force (acting as a charge-controlled capacitive device) closing the gap to facilitate the safe intermittent discharging.

The application discloses a kind of transient dose rate radiation effect TCAD model calibration method and system, the method steps include: step S1: the initial TCAD model of transistor is constructed;Step S2: extracting the electrical characteristic parameter under standard model;Step S3: the parameter in model is adjusted in turn, the linear region transfer characteristic curve of transistor is simulated;Step S4: the saturation region transfer characteristic curve of transistor is simulated, and the source / drain contact resistance parameter in model is adjusted;Step S5: the output characteristic curve of transistor is simulated, and the saturation velocity and high field mobility degradation parameter in model are adjusted;Step S6: according to calibration model information, simulation is carried out, and the distribution data and concentration of electron hole pair are obtained;Step S7: the connection mode of transistor is adjusted in model parameter, to simulate the process that transient radiation acts on the transistor without applying bias voltage.The application has the advantages of simple implementation method, low cost, calibration precision and efficiency etc..

The present application relates to the field of medical magnetic resonance image reconstruction and intraoperative navigation, and particularly relates to an intraoperative magnetic resonance image reconstruction method and system based on medical registration guidance, comprising: acquiring preoperative high-field magnetic resonance images and intraoperative low-field magnetic resonance images of the same patient; inputting the preoperative high-field magnetic resonance images and the intraoperative low-field magnetic resonance images into a trained image processing model; performing registration by taking the preoperative images as the moving images and the intraoperative images as the fixed images through a registration network, generating a deformation field from the preoperative to the intraoperative, and correcting the brain structure displacement caused by the surgery; performing spatial transformation on the preoperative images based on the deformation field to obtain high-field images aligned with the intraoperative images; and fusing the aligned high-field prior information and the intraoperative low-field image features by using a reconstruction network to reconstruct high-quality target images. The present application effectively improves the definition and detail resolution of the intraoperative images by introducing individualized preoperative prior, and provides more accurate image support for surgical navigation.

This invention discloses a broadband detector in the mid-infrared band, comprising, from bottom to top, a silicon wafer, a reflective layer, and a dielectric layer. U-shaped superconducting nanowires are disposed on the surface of the dielectric layer, with the open ends of the U-shaped superconducting nanowires connected to gold electrode one and gold electrode two, respectively. Gold antennas are symmetrically disposed on both sides of the U-shaped superconducting nanowires. Gold electrode one is connected to a constant voltage source, and gold electrode two is grounded. This invention also discloses a method for fabricating the broadband detector in the mid-infrared band. The superconducting nanowire single-photon detector based on gold antenna enhancement of this invention features high field gain, large photosensitive area, high nanowire absorption efficiency, high intrinsic quantum efficiency, and extremely low fill factor, enabling efficient application in mid-infrared band detection. Compared with traditional optical cavity superconducting single-photon detectors, it has advantages such as high fabrication feasibility, high compatibility with planar processes, and field gain, and can detect mid-infrared light signals across a wider band.

A modified hydrogen type silico-aluminate molecular sieve, characterized in that (1) the A value is 4.0-6.0 and the B value is not less than 1.4, in the formula: the Q4, Q3, Q2, Q1 and Q0 respectively correspond to the SiO4 tetrahedron structure of the molecular sieve MAS NMR 29 The peak area of five distinguishable peaks appearing in the Si spectrum corresponds to the SiO4 tetrahedron structure of the species, and the peaks from high field to low field are in turn corresponding to Si(4Si, 0Al), Si(3Si, 1Al), Si(2Si, 2Al), Si(1Si, 3Al) and Si(0Si, 4Al) resonance peaks; (2) the surface silicon aluminum molar ratio is 0.9-2.0; (3) the bulk silicon aluminum molar ratio is 2.0-4.0.

The present application relates to the technical field of ultra-low field magnetic resonance system, and particularly relates to a battery state of charge detection method and system based on closed-loop adaptive ultra-low field MRI, comprising: collecting the phase change of water molecule H signal caused by the magnetic field disturbance of the battery to be detected to reconstruct a first signal phase image; extracting a high-information-area mask, then resampling to obtain a second signal phase image; inputting the second signal phase image into a state of charge detection model to predict the state of charge value of the battery to be detected. The battery magnetic resonance detection scheme in the prior art needs to use a high-field magnetic resonance system, which is not conducive to the use of the production line. The detection equipment is replaced with an ultra-low field magnetic resonance system, so that the shielding room and other structures in the traditional magnetic resonance system are omitted, and the imaging accuracy is improved by first locating the high-information-area and then resampling the area, thereby improving the accuracy of the detection model in estimating the state of charge.

The application discloses a magnetic resonance image enhancement method based on noise utilization and a generative adversarial network, and belongs to the technical field of medical image processing. The method comprises the following steps: acquiring paired 3T and 7T magnetic resonance images and preprocessing to obtain 3T MRI image blocks; a three-dimensional generative adversarial network with a fusion noise utilization mechanism is constructed, the generator is based on V-net construction and fuses a feature-level adaptive noise injection mechanism and a 3D CBAM attention module, and the discriminator is a four-stage hierarchical 3D convolutional network; a total loss function composed of pixel, perception, gradient structure consistency and adversarial loss is designed; the network is trained in an alternating update mode; and a 7T-level high-quality image is output by inputting a 3T image to be processed into the trained generator. The application effectively realizes high-quality enhancement from low-field to high-field magnetic resonance images, significantly improves the signal-to-noise ratio and resolution of the images, and is suitable for clinical auxiliary diagnosis.

Described is a no-insulation superconducting magnet design that utilizes high temperature superconducting tapes arranged in a 'layer-wound' configuration. The design is compact, modular and utilizes a fabrication methodology that scales well for commercialization. Embodiments described herein may find use in a wide variety of applications including, but not limited to solenoidal magnets in general, including devices operating at very high magnetic field strength and also in plasma thrusters for spacecraft propulsion, in particular, a field magneto plasma dynamic (AF-MPD) thruster, which requires a compact, high-field solenoidal design.

The present application relates to a kind of analytical methods for determining hydrogenation rate of hydrogenated nitrile, comprising the following steps: using high-field nuclear magnetic or low-field nuclear magnetic, hydrogenated nitrile sample containing solvent is tested, setting sampling parameter, acquisition one-dimensional nuclear magnetic resonance diffusion ordering spectrum spectrum diagram;Hydrogenated nitrile corresponding chemical shift and integral area information are obtained by one-dimensional nuclear magnetic resonance diffusion ordering spectrum spectrum diagram, combined with nitrile raw material component information, calculate hydrogenation rate;The nitrile raw material component information includes acrylonitrile content, 1,4-butadiene content, 1,2-butadiene content;Hydrogenated nitrile corresponding chemical shift and integral area information include saturated aliphatic hydrocarbon signal integral area, 1,4-butadiene CH=CH signal and 1,2-butadiene CH= signal integral area, 1,2-butadiene CH2= signal integral area.Compared with prior art, the present application is a kind of analytical methods for determining hydrogenation rate of hydrogenated nitrile containing solvent, which can be used in nitrile hydrogenation process, and hydrogenation rate is rapidly analyzed after hydrogenation reaction.