65 results about "Field uniformity" patented technology

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 simulation method for a corresponding relation between a baffle tongue position and a flow field of a semi-spiral suction chamber, and relates to the technical field of double suction pump design and numerical simulation. According to the method, a three-dimensional flow channel model of multiple groups of baffle tongue reference position parameters is constructed, multi-working-condition simulation and quantitative analysis are combined, a mapping relation model of baffle tongue positions and flow field characteristic parameters is established, and a baffle tongue region vortex generation rule, turbulence dissipation and pressure pulsation characteristics are accurately captured; the optimal baffle tongue parameter interval is determined by combining the flow field uniformity and energy loss minimization principle, the flow loss is effectively reduced, the vortex strength and energy dissipation are reduced, and the flow field uniformity is improved, so that the pump efficiency is improved, the vibration noise and the cavitation phenomenon are inhibited, and the optimal baffle tongue parameter interval is obtained by adopting adaptive grid encryption, a multiphase flow cavitation model and a test verification mechanism. The mapping model is corrected by combining measured data, so that the optimization result can directly guide the baffle tongue design under different working conditions, the research and development period is remarkably shortened, and the physical test cost is reduced.

The invention discloses a flow uniformizing device, which relates to the technical field of semiconductor processing, is applied to a measuring cavity and comprises a first flow guide part and a second flow guide part, and the first flow guide part is provided with a first flow guide surface for receiving airflow; the second flow guide part is connected to the lower edge area of the first flow guide face and provided with a second flow guide face, and an obtuse-angle flow guide structure is formed by the first flow guide face in the first flow guide part and the second flow guide face, connected to the lower edge area of the first flow guide face, in the second flow guide part. Meanwhile, the extension direction of the second flow guide face faces the side wall of the measuring part, the obtuse angle flow guide structure receives the vertically downward airflow output by the airflow generation device through the first flow guide face, and directional deflection of the airflow is achieved through the second flow guide face, so that the airflow smoothly transits from vertical flowing to adherence flowing along the side wall of the measuring part. Therefore, the uniformity of the flow field near the measurement part is improved, and the measurement accuracy is improved.

The invention relates to the technical field of steelmaking, in particular to a method for quickly detecting the non-uniformity of a flow field of a continuous casting crystallizer on line, which comprises the following steps of: acquiring a signal in a hydraulic vibration device of the crystallizer, converting the signal into a digital signal, and preprocessing the digital signal as time sequence synchronization data; the method comprises the following steps: slicing time sequence synchronization data according to a fixed time window, extracting multi-dimensional features from data in each time window, and constructing feature vectors; performing flow field evaluation by adopting a mixed model combining supervised learning and unsupervised learning; and outputting an alarm level prediction and diagnosis mode by using the multi-task learning model. An original signal capable of directly or indirectly reflecting a flow field state is acquired at high frequency through a multi-source sensor array arranged on a crystallizer; extracting characteristic values strongly related to the characteristics of the flow field by using a signal processing technology; inputting the characteristic value into a pre-trained deep learning neural network model; the model outputs a comprehensive evaluation index about the uniformity of the flow field in real time, and automatically identifies a non-uniform mode and grade.

A magnetic resonance (MR) receive coil (18) includes a conducting loop (20) that is resonant at a Larmor frequency of a design-basis B0 magnetic field of at least 3 Tesla; and a conducting trace (22) configured to detune the conducting loop from the Larmor frequency in response to a DC current flowing through the conducting trace. The conducting trace further includes a receive |B1|-field uniformity-enhancing inductor (L3) positioned at an intermediate point along the conducting trace.

The invention discloses an ice crystal field uniformity measuring device and method, and belongs to the technical field of ice crystal tests. The problem that in the prior art, the uniformity and stability effects of an ice crystal field are poor is solved. According to the technical scheme, the ice crystal field uniformity measuring device is calibrated; the side face of a frame of the ice crystal field uniformity measuring device is tightly attached to one side of the test section area, an external weighing sensor is used for measuring the mass of collecting bags on the two sides of the tested ice crystal nozzles, and the effective covering diameter of the single tested ice crystal nozzle is solved through drawing; according to the axial distance of the tested ice crystal nozzles, the width X of the ice crystal field test area and the height Y of the ice crystal field test area, the tested ice crystal nozzles are arranged, and ice crystal distribution of the test section area is guaranteed. The device is used for measuring the effective coverage diameter of the ice crystal jetted by the single ice crystal nozzle in the test area and the uniformity of the ice crystal field, the arrangement mode and the arrangement distance of the ice crystal nozzles can be adjusted according to the effective coverage diameter of the single ice crystal nozzle, and the coverage area of the ice crystal field in the test area is increased.

A radio frequency coil device and array for ultrahigh field magnetic resonance imaging comprises a coaxial dipole antenna and a dielectric resonator antenna which work in a collaborative excitation mode, and the coaxial dipole antenna is in a circular ring shape or a rectangular ring shape and is provided with a first radio frequency port; the dielectric resonator antenna comprises a dielectric resonator and a coupling coil, the dielectric resonator, the coupling coil and the coaxial dipole antenna are sequentially distributed in parallel at intervals along the Y axis, the coupling coil is provided with a second radio frequency port, and the dielectric resonator forms a resonant cavity and realizes energy coupling with the coaxial dipole antenna through the coupling coil; excitation signals are respectively applied to the first radio frequency port and the second radio frequency port, so that the coaxial dipole antenna and the dielectric resonator antenna respectively generate orthogonal electromagnetic field distribution, and low-channel coupling is realized. Through the collaborative excitation mode and the orthogonal electromagnetic field distribution design, coupling between channels is effectively reduced, the B1 + field uniformity is improved, meanwhile, the peak SAR is reduced, and the imaging efficiency and safety are improved.

The invention discloses a crankshaft surface magnetization field uniformity evaluation method for aviation nondestructive testing, and relates to the technical field of nondestructive testing, and the method comprises the following steps: carrying out detection pretreatment on a to-be-tested crankshaft to obtain a tested crankshaft, applying a forward magnetic field to the crankshaft according to a magnetic powder detection method, carrying out magnetic field intensity acquisition on the applied magnetic field, and calculating the uniformity of the applied magnetic field; obtaining a first magnetic field intensity signal; acquiring three-dimensional attributes of the tested crankshaft, dividing the crankshaft according to the three-dimensional attributes to obtain areas with the same attributes, analyzing the first magnetic field intensity signals on the areas with the same attributes, and determining abnormal signals existing in the first magnetic field intensity signals; determining the position of the crack based on the abnormal information to obtain first position information; and performing magnetic field change judgment on the first magnetic field intensity signal based on the first position information, determining a crack form, obtaining real position information in combination with the first position information, and outputting the real position information. The method has the effect of improving the crankshaft defect judgment accuracy.

The application discloses a kind of unmanned aerial vehicle granular field uniformity detection device and detection method, belong to agricultural engineering and farmland detection technical field.The device includes detection device body, optical fiber sensing module, embedded PCB circuit board.The detection method is laid out and horizontally calibrated device, optical fiber sensing module collects the light signal variation of granular interruption detection beam, signal processing, effective counting obtains the number of particles per unit time, combined with single particle average mass conversion real-time spreading amount;Host computer collects multiple sampling point data to calculate the variation coefficient of spreading amount, compares preset threshold to determine uniformity grade, and accordingly guides unmanned aerial vehicle operation parameter adjustment.The application realizes real-time accurate detection of spreading uniformity, has strong environmental adaptability, is simple and easy to operate, effectively improves the intelligentization and high-efficiency level of field spreading monitoring, and is suitable for various agricultural unmanned aerial vehicle granular spreading operation scene.

The invention provides a high-temperature superconducting induction heating control method and system based on multi-physics field coupling, and the method comprises the steps: driving a heat conduction model through eddy-current loss data outputted by a three-dimensional electromagnetic field model, and feeding back the temperature distribution data of the heat conduction model to the three-dimensional electromagnetic field model for parameter correction. Meanwhile, the temperature distribution data and the eddy-current loss data respectively drive a stress-strain model to calculate structural deformation to form a closed-loop link, finally, multi-field data dynamic interactive convergence is realized by adopting an iterative solution algorithm, and consistency and precision of output data of each physical field are ensured through a preset threshold value. Finally, cooperative control over temperature field uniformity, structural stability and energy efficiency in the heating process is achieved.

The invention discloses a flexible metasurface enhancement device and method for low-field magnetic resonance imaging. The open type spiral metasurface antenna is composed of open type spiral metasurface units arranged periodically, and each unit comprises a flexible dielectric substrate and an open type spiral metal pattern rotating 90 degrees in a double-face space. Through the depth sub-wavelength design, the unit side length is 0.03 times smaller than the working wavelength, the ultra-thin flexible structure is adopted, and the total thickness is smaller than or equal to 0.15 mm, preferably 0.136 mm. Double-sided patterns are synchronously manufactured by adopting a printed circuit board process, so that the manufacturing cost is remarkably reduced. During application, the device is attached to a scanning part, a magnetic field is enhanced through inductive coupling with a radio frequency coil, the image signal-to-noise ratio is increased by 97.4%-133.2% in a 0.2 T MRI system, the field uniformity is improved, meanwhile, the local value is smaller than or equal to 0.2 W / kg, and the contradiction between the insufficient low-field MRI signal-to-noise ratio and the clinical adaptability of the device is solved.

The utility model provides a kind of flow field pool for flux transfer, belong to chip mass transfer technical field, including flow field groove, the upper part of one end of flow field groove is provided with flow field tower, the lower part of another end of flow field groove is provided with flow field pool, slope is provided between flow field groove and flow field tower, filter screen is provided between flow field groove and flow field pool, flow field groove surface is provided with fluid, chip is provided between fluid, RGB board is provided in the middle of flow field groove, and fluid is located above RGB board.The utility model uses above-mentioned one kind of flow field pool for flux transfer, solve the chip transfer efficiency low in prior art, recovery difficult and the problems such as poor flow field uniformity.

The invention discloses a nuclear magnetic resonance passive shimming module design method and device based on Gaussian splashing, and relates to the technical field of precision electromagnetic field optimizing.The nuclear magnetic resonance passive shimming module design method comprises the steps that initialization is conducted in a design domain of a passive shimming module, and an initial parameter set of all Gaussian splashing particles is obtained; constructing a mapping relation between the equivalent magnetic moment and the magnetization weight factor of each Gaussian splashing particle and between the intrinsic magnetization intensity and the scaling vector of the magnetic material, and constructing a magnetic field intensity calculation model; inputting the initial parameter set of all Gaussian splashing particles and the real magnetic field intensity into a Gaussian splashing particle parameter set iterative optimization algorithm, and calculating and predicting the magnetic field intensity through a magnetic field intensity calculation model; and based on the predicted magnetic field intensity, the real magnetic field intensity, the magnetization weight factor vector and the center position vector, constructing a multi-objective loss function and performing iterative optimization to obtain an optimized parameter set and manufacture a passive shimming module. The method solves the problem of low precision and efficiency of compensating a magnetic field with a complex shape.

The invention discloses a plasma field uniformity adjusting device which comprises a cavity cover, a coil, a first adjusting piece, an air nozzle and a second adjusting piece, and through the first adjusting piece and the second adjusting piece, when a small-size wafer is processed or the plasma concentration of a central area needs to be increased, the coil can rotate and contract centripetally so as to increase the central field intensity; the gas nozzle can be close to the center of the working cavity to increase central gas concentration; when a large-size wafer is processed or the plasma concentration of a central area needs to be reduced, the coil can be centrifugally rotated and diffused to reduce the central field intensity, and the gas nozzle can be far away from the center of the working cavity to reduce the central gas concentration; the distribution of plasmas can be improved in a targeted manner by winding and unwinding the coil or changing the radial position of the air tap; and through cooperative adjustment of the coil and the gas nozzle, dynamic matching of plasma distribution and reaction gas conveying can be realized, and improvement of process uniformity and equipment adaptability is facilitated.

The application discloses a boiler secondary air distribution box flow field uniform flow resistance reduction optimization and flow measurement device, and relates to the technical field of a boiler secondary air distribution box.The device comprises a main pipeline and two elbow pipelines which are communicated with the main pipeline, the end of the elbow pipeline is provided with a transition chamfer for reducing air resistance, and the inside of the elbow pipeline is provided with a grid plate and a uniform flow assembly for promoting uniform distribution of secondary air flow, and the grid plate and the uniform flow assembly are arranged side by side.The uniform flow assembly comprises a guide plate which is fixedly installed on the inner wall of the elbow pipeline.The grid plate and the uniform flow assembly are arranged in the elbow pipeline, the distribution of the secondary air flow field can be optimized, the secondary air can be uniformly distributed, the air resistance in the elbow pipeline can be reduced by the transition chamfer, the stability and uniformity of the airflow in the pipeline are improved, the accuracy of the measurement of the air measurement element is improved, and the uniformity of the overall air distribution of the boiler is improved.

A device and method for measuring the uniformity of an ice crystal field are disclosed, belonging to the field of ice crystal testing technology. This invention solves the problem of poor uniformity and stability of ice crystal fields in existing technologies. Key technical points include: calibrating the ice crystal field uniformity measuring device; placing the frame of the device against one side of the test area; using an external weighing sensor to measure the mass of the collection bags on both sides of the ice crystal nozzle being tested; and graphically calculating the effective coverage diameter of a single ice crystal nozzle. Based on the axial spacing of the nozzles, the width (X) of the ice crystal field test area, and the height (Y) of the test area, the nozzles are arranged to ensure proper ice crystal distribution in the test area. This invention is used to measure the effective coverage diameter and uniformity of ice crystals ejected from a single nozzle in the test area. The arrangement and spacing of the ice crystal nozzles can be adjusted according to their effective coverage diameter to improve the ice crystal field coverage area of ​​the test area.

A method for evaluating the flow field uniformity of a slotted wall test section of a supersonic wind tunnel belongs to the field of experimental aerodynamics. In order to quickly and efficiently evaluate the flow field uniformity of a slotted wall test section. The present invention calculates the wall boundary conditions of the slotted wall test section of a supersonic wind tunnel, divides the slotted wall test section into a characteristic line grid, and solves the aerodynamic parameters of the starting grid point on the wall; calculates the aerodynamic parameters and coordinates of the intersection of the right-extending characteristic line of the starting grid point on the wall extending upstream and the intersection point P of the test section inlet plane and the left-extending characteristic line emitted from point (0,0); calculates the aerodynamic parameters and coordinates of the intersection of the right-extending characteristic line emitted from point P and the left-extending characteristic line emitted from point (1,1) to point (5,5); calculates ( k , k ‑5) The right extension characteristic line from point ( k ‑5, k -5) Aerodynamic parameters and coordinates of the intersection of the left-extending characteristic line from point 1. The present invention has high calculation efficiency.

The embodiment of the invention provides a flow field optimization method and optimization device of a multi-branch flow channel system and a storage medium, and belongs to the technical field of flow channel flow field optimization. Comprising the following steps: establishing a simulation model of a multi-branch flow channel system; performing flow field uniformity analysis on the simulation model to determine the distribution flow of each branch flow channel of the multi-branch flow channel system; according to the number of branches of the multi-branch flow channel system and the distribution flow and the sectional area of each branch flow channel, the target water inlet area of each branch flow channel is determined; and optimizing and adjusting the distribution flow of each branch flow channel according to the target water inlet area. According to the method, the design process is converted into a systematized and data-driven scientific process, the flow channel design can be quickly and accurately evaluated and optimized by combining model simulation, data processing and an optimization algorithm, homogenization of a cooling liquid flow field in a system is achieved, and then the consistency of a temperature field is guaranteed.

The invention relates to the technical field of monitoring and control, and discloses a residual stress online monitoring and release control method for CNC machining. The method comprises the following steps: coupling unit passivation and cutting generation sub-models through a digital twin prediction frame, and synchronizing a residual stress field and a space deformation field in real time; arranging a fiber bragg grating array and digital image related mark points to form a multi-channel sensing network, and mapping strain, temperature and vibration data into stress increment and displacement increment; and carrying out closed-loop calibration by using an extended Kalman filter, executing a layered releasing and re-clamping strategy after each pass, generating an instantaneous boundary condition reinjection frame, and carrying out iteration until a residual stress uniformity index and a space deformation field uniformity index are lower than a threshold value, and then automatically terminating. The one-time machining qualification rate of CNC machining can be increased.

The invention belongs to the technical field of parameter control, and discloses a purification parameter control system and method for tryptophan in peanut buds. The method comprises the following steps: acquiring frequency shift of a chromatographic column through ultrasonic waves, analyzing to obtain flow velocity, and analyzing to obtain flow field uniformity and vortex intensity according to the flow velocity; an optogenetics probe is constructed, and initial fluorescence intensity is acquired through blue light activation and acquisition; when the uniformity of the flow field is smaller than a uniformity threshold value, the initial fluorescence intensity is compensated through the vortex intensity to obtain the fluorescence intensity; synchronously collecting temperature and ORP potential, and constructing a separation kinetic model; obtaining the enantiomer impurity concentration, and judging the process stage; setting a dual-stage optimization target according to the process stage, performing optimization in combination with the separation kinetic model to obtain an optimization purification parameter, and generating a corresponding control instruction in combination with a control barrier function; through interdisciplinary fused multi-physics field modeling and an intelligent optimization framework, accurate control and green and efficient production of the tryptophan purification process are realized.

The invention is applicable to the technical field of circuit board detection, and provides a composite circuit board manufacturing exposure detection method and system, and the method comprises the steps: obtaining standard energy for exposing a circuit board; performing multispectral scanning imaging on the circuit board to obtain a field uniformity factor of the circuit board and an interlayer image of the circuit board; calculating the initial energy of the exposure point; obtaining an interlayer image of the circuit board, carrying out superposition error calculation, and outputting a superposition error prediction value; correcting the initial energy according to the superposition error predicted value, and outputting corrected energy; exposing the circuit board by using the correction energy; photographing and analyzing the circuit board to obtain one or more defect areas; performing exposure quality evaluation according to the one or more defect areas, and outputting an exposure quality evaluation score; therefore, the exposure precision and consistency of the circuit board are improved, the defect rate is greatly reduced, the product quality is improved, and the user experience is further improved.

The utility model provides a device for preparing silicon carbide crystals by a liquid phase method with a uniform flow field, which comprises a graphite crucible and a seed crystal rod, a notch is arranged on a top plate of the graphite crucible, the lower end of the seed crystal rod extends into an inner cavity of the graphite crucible from the notch of the graphite crucible and is provided with seed crystals, a graphite column is further arranged in the inner cavity of the graphite crucible, and the graphite column is connected with the seed crystal rod. The axial direction of the graphite column extends in the left-right direction and is located below the seed crystal, the left end and the right end of the graphite column are suspended and supported through graphite supports respectively, and the graphite rotating shaft is driven by a driving mechanism to rotate. Compared with the prior art, the graphite crucible has the advantages that the rotatable graphite column is arranged in the inner cavity of the graphite crucible, and the transversely arranged graphite column can generate an upward stream in the rotating process, so that the convection intensity of the center of raw material melt in the graphite crucible can be enhanced; the problem that the produced silicon carbide crystals are not uniform due to non-uniform doping elements is effectively solved. And meanwhile, the graphite column can supplement a carbon source, so that the service life of the graphite crucible is prolonged.

The invention discloses a satellite-borne FPI wind measurement interferometer device with temperature control, which comprises an external telescope system and an FPI interference imaging system, and is characterized in that the external telescope system receives radiation light and introduces the radiation light into the interference imaging system; the interference imaging system sequentially comprises a collimation system, an optical filter system, an etalon system and an imaging system in the light propagation direction. The collimation system receives radiation light introduced by the external telescope; the etalon system comprises a temperature control structure; the temperature control structure comprises a heat conduction ring wrapping the outer side of an etalon inner cylinder of the etalon system; and a plurality of annular heat pipes for circumferential heat conduction are embedded in the outer surface of the heat conduction ring. The device also comprises a sliding support structure which enables the lens barrel to freely slide along the optical axis direction. The temperature control system has the advantages that optical errors caused by thermal stress are effectively eliminated, thermal stability and thermal field uniformity are remarkably improved, and the temperature control system is simple in structure and high in reliability.

The invention discloses a passive shimming method, system and device of a permanent magnet type magnetic resonance imaging system, and belongs to the field of magnetic resonance imaging, and the method comprises the steps: measuring an initial magnetic field, and carrying out the harmonic analysis, and obtaining an initial harmonic coefficient; obtaining gasket parameters to enable the nonlinear magnetization correction analysis model to calculate the gasket magnetization intensity of each gasket through the hysteresis model, converting the gasket magnetization intensity into equivalent surface current density through the equivalent surface current model, and performing integral solution on the equivalent surface current density under a cylindrical coordinate system to obtain the gasket magnetization intensity. Obtaining the magnetic vector potential and the magnetic field of each gasket, and carrying out harmonic analysis to obtain a gasket harmonic coefficient; in the passive shimming optimization model, the magnetization thickness function is iteratively updated to obtain a laying scheme when the total weight of the gasket is minimum, and the gasket is laid according to the laying scheme to realize passive shimming, so that higher field uniformity can be realized, the optimization efficiency is improved, and the consumption of the gasket is reduced.

The utility model relates to a steam crosslinking technical field, the utility model provides a kind of steam crosslinking box that improves internal temperature field uniformity, including box, still including the installation slot being opened in the box front wall, the connecting slot is opened in the both sides of the installation slot, the accommodating slot is opened in the both sides of the connecting slot;Box door mechanism, the box door mechanism includes No. 1 box door and No. 2 box door, No. 1 box door and No. 2 box door sliding installation in the installation slot and accommodating slot are connected through connecting slot, No. 1 box door and No. 2 box door are connected by locking assembly and clamping assembly;Sealing assembly, the sealing assembly is provided with two groups, two groups the sealing assembly is set in No. 1 box door and No. 2 box door far from one end;Translation guiding mechanism, the translation guiding mechanism is installed in the bottom end of No. 1 box door and No. 2 box door. By the synergies of box, sealing assembly, locking assembly and clamping assembly, the box is closed, and the internal temperature field uniformity is better guaranteed.

The invention discloses a concrete pouring process monitoring method and system based on multi-source data, relates to the field of intelligent monitoring, and particularly relates to the following steps: carrying out semantic segmentation and positioning on a pouring area and a vibrating rod by using a visible light video, and constructing an accurate space mask; meanwhile, the key vibration frequency is extracted from the vibration signal. On the basis, a vibration phase-locked thermal imaging technology is applied, the vibration frequency is used as a phase-locked reference, and harmonic energy transfer gain characteristics with the same frequency as vibration are extracted from a thermal infrared image sequence. And then temperature field uniformity evaluation is carried out by fusing the spatial position and the energy transfer characteristics, so that quantitative visualization of the concrete pouring quality is realized, and the technical problem that whether quality defects such as voids and pitted surfaces exist in the concrete or not cannot be judged only by means of surface visual characteristics is effectively solved.

The application discloses a kind of control methods of flow field uniformity of immersion liquid cooling cabinet, to solve the problem that temperature uniformity in the liquid pool of immersion liquid cooling cabinet in prior art cannot be accurately and energy-saving controlled, a kind of control methods of flow field uniformity of immersion liquid cooling cabinet, comprising the following steps: S1, detect the temperature of each point in the cabinet, and calculate the average temperature and variance Tf in the cabinet, and obtain the cabinet setting temperature Ts;S2, whether to improve the liquid pump frequency is determined by judging the cabinet setting temperature Ts and the cabinet liquid temperature Tc;S3, judge the temperature difference ΔT and variance Tf in the cabinet, determine the overall uniformity of temperature in the cabinet and whether there is local hot spot;The application accurately identifies local hot spot and the uniformity of temperature in the cabinet by the temperature change in the cabinet, and then judges the operating load of IT equipment, according to the feedback of temperature, carries out accurate heat dissipation control and energy-saving control, improves the stability and reliability of equipment in data center.

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.

The invention discloses an additive manufacturing trajectory planning method based on isotropic constraint, and relates to the technical field of additive manufacturing and intelligent path planning, and the method comprises the steps: generating a geometric mask; generating discrete layer basic data which can be used for intra-layer diagonal dominant path planning; generating in-layer path data conforming to the geometric constraint of the part and with balanced heat input; obtaining an interlayer path sequence; generating a trimmed in-layer path sequence; generating path data after heat input balance; in combination with the heat input balance path data, generating feature region path data meeting a global tolerance requirement; and automatically adjusting the line spacing, the segment sequence, the starting and ending point distribution and the compensation segment until final trajectory data meeting the isotropic constraint is generated. The method solves the problems of inconsistent three-direction thermal response, residual stress concentration and forming deformation caused by lack of path level isotropic constraint and thermal input balance mechanism in the prior art, and achieves the technical effects of improving forming stability, structural precision and thermal field uniformity.