13 results about "Magnetic analysis" patented technology

The invention relates to the technical field of electric energy metering boxes, and discloses an outdoor electric energy metering box monitoring system and method based on an intelligent sensor. A magnetic variable detection module; the electromagnetic analysis module is configured to judge whether the to-be-monitored electric energy metering box has an abnormal power utilization behavior or not based on a correlation calculation result between the electric variable change trend and the magnetic variable change trend; the abnormal type determination module is configured to determine the abnormal type of the abnormal power consumption behavior based on the trend deviation degree; the abnormal alarm value determining module is configured to determine an abnormal alarm value based on the abnormal type and the historical electromagnetic variable time sequence; and the alarm module is configured to determine the alarm level of the abnormal power consumption behavior based on the abnormal alarm value and give an alarm in real time. According to the invention, through cooperative work of multiple modules, the outdoor electric energy metering box can be comprehensively and accurately monitored.

This invention discloses a method for improving SmFe 12 A method for determining the magnetic properties of sintered permanent magnet materials. The method includes: using a low-melting-point rare-earth-rich alloy sheet as a diffusion source to conduct magnetic analysis on SmFe2... 12 The sintered permanent magnet material is sandwiched and heat-treated to achieve SmFe 12 The magnetic properties of sintered permanent magnet materials are improved; wherein the low-melting-point rare-earth-rich metal sheet includes Sm sheet and / or Sm alloy sheet. The modified SmFe prepared by this invention... 12 Sintered permanent magnet materials exhibit continuous grain boundary phases, high coercivity, and high energy product. Room temperature coercivity can be increased by 2000–8000 Oe. This method is simple and effective, and is applicable to SmFe... 12 This provides a new approach to improving the overall magnetic properties of sintered permanent magnet materials.

The application relates to an optimization selection method of a high-temperature superconducting direct-current cable, which records the change of a magnetic field under different winding angles in three-dimensional simulation by establishing an accurate three-dimensional superconducting cable model through COMSOL, records the change of the magnetic field of a superimposed different harmonic component current strip, and decomposes the magnetic induction intensity in parallel and vertical directions, so that the average value of the magnetic induction intensity under different conditions is compared with the unit value and the reference value, three-dimensional cable electromagnetic analysis under different conditions is carried out on the cable under different conditions, and the analysis speed and accuracy of the cable are effectively improved. Meanwhile, the application analyzes an anisotropy influencing factor, provides a basis for winding of superconducting strips, and explores the application value of the high-temperature superconducting direct-current cable.

This application relates to a Stern-Glach magnetic analysis method. The method includes: constructing a particle beam to be tested; the particle beam being atoms or molecules with bound electrons; generating a non-uniform magnetic field along the path of the particle beam, and synchronizing the arrival time of the particle beam to the non-uniform magnetic field with the generation time of the non-uniform magnetic field so that the particle beam is subjected to a pulse of the non-uniform magnetic field when passing through it; the pulse width of the non-uniform magnetic field is set based on the orbital period of the electrons in the particle beam; obtaining the landing position of the particle beam after passing through the non-uniform magnetic field; and obtaining statistical information on the instantaneous magnetic moment of the particle beam based on the landing position. This method can detect the instantaneous magnetic moment of a particle beam.

The invention relates to a permanent magnet synchronous motor heterogeneous grid adaptive high-precision magnetic network modeling method, and belongs to the technical field of permanent magnet synchronous motor electromagnetic analysis. The method comprises the following steps: extracting a single-slot or single-pole minimum periodic unit of a motor structure, carrying out symmetric fan-shaped grid division, accurately representing the boundary of a heterogeneous material by utilizing a polar coordinate function, and calculating magnetic conductance based on a geometric overlapping principle; the permanent magnet and the stator winding magnetomotive force are fused through unified matrix modeling, and the stability of nonlinear solution is improved in combination with a Newton-Raphson iterative algorithm. According to the method, the modeling process is simplified, the preprocessing time and the calculation time are greatly shortened compared with those of a finite element method, and the efficiency of multi-working-condition iterative optimization is remarkably improved on the premise that high precision is guaranteed.

The application discloses a kind of two-dimensional magnetic field analysis method and system of multilayer cylinder magnetic shielding structure, belong to electromagnetic analysis technical field.The method includes: establishing multilayer cylindrical two-dimensional analytical model, the magnetic field distribution expression of each air domain and magnetic shielding layer is determined;The continuity constraint condition at the inner and outer boundary of magnetic shielding layer is solved, the expression of corresponding reflection coefficient and transmission coefficient is obtained, and it is simplified, and the expression only including shielding layer radius and relative magnetic permeability is obtained;Based on the cumulative influence of incident harmonic amplitude in the transmission process of adjacent two layers of magnetic shielding layer, transmission coefficient is obtained;According to reflection coefficient, transmission coefficient and transmission coefficient, the magnetic vector potential component expression of each air domain is determined, the corresponding magnetic field distribution result is obtained, and magnetic field analysis is carried out.The magnetic vector potential component expression of each air domain of magnetic shielding structure is directly written by self-defined parameter, and the complexity of multilayer structure solving process is reduced.

Devices and methods for analysing extracellular vesicle glycans are described. According to an embodiment, a microfluidic device comprises an inlet portion configured to receive a fluid sample; a mixing portion fluidically coupled to the inlet portion and configured to facilitate mixing between the fluid sample and magnetic nanoparticles functionalized to bind with extracellular vesicles and aggregate to vesicle glycans in the fluid sample; a magnetic separation portion fluidically coupled to the mixing portion and configured to separate clusters of magnetic nanoparticles from the fluid sample; and a magnetic sensor configured to measure magnetic properties of the fluid sample after it has passed through the magnetic separation portion. The magnetic nanoparticles may configured to aggregate in the presence of respective lectins when bound with extracellular vesicles carrying target glycans. In a specific embodiment, the magnetic particles comprise a magnetic polycore coated with polydopamine.

The invention relates to the technical field of unconventional shale oil and gas reservoir exploration, in particular to a method, a device, equipment and a medium for predicting the imbibition utilization efficiency of stratified shale oil. According to the method, the imbibition utilization efficiency of the stratified shale oil can be quickly predicted, and an effective means is provided for revealing an interaction reaction mechanism of shale reservoir rock and an injected medium, a shale reservoir rock imbibition oil extraction mechanism, a shale reservoir recovery efficiency improving mechanism and the like. According to the present invention, the imbibition oil discharge indoor test under the oil reservoir temperature and pressure condition is combined with the two-dimensional nuclear magnetic analysis, and the use conditions of the crude oil in different aperture spaces are distinguished according to the two-dimensional nuclear magnetic T1 and T2 spectrograms of the nuclear magnetic diagnosis, such that the respective imbibition oil discharge efficiency functions and the overall critical use lower limit of different aperture intervals are established so as to be adopted as the data volume model; the method for rapidly predicting the imbibition utilization efficiency of the stratified shale oil by using the two-dimensional nuclear magnetic technology under the conditions of rapidness, accuracy and no damage to the rock core is provided.

The invention relates to the technical field of instruments and meters, in particular to a small-sized double-focusing mass spectrum imaging system for space and a use method, the system comprises an ion source, a coding plate, an electrostatic analyzer, a magnetic analyzer and an FOP detector, the ion source adopts a symmetrical magnetic field structure, and a cathode emission device and a hot filament are respectively located at two ends of the ion source; the coding plate is arranged right in front of the ion source; the electrostatic analyzer is composed of two coaxial cylindrical electrodes; the magnetic field structure of the magnetic analyzer is a direct asymmetric fan-shaped magnetic field; the electrostatic analyzer and the magnetic analyzer are combined in a reverse serial connection manner; the FOP detector adopts a micro-channel plate + fluorescent screen + CMOS camera imaging mode. According to the invention, the limitation of large sizes of ion beams and imaging light spots thereof under a conventional single-slit outlet structure of a mass spectrometer is overcome by adopting a coding aperture mode, so that the mass resolution of the mass spectrum imaging device is remarkably improved, the sensitivity is high, the imaging speed is high, the signal-to-noise ratio is high, and the detection of lower-content substances is realized.

The application discloses a full-bridge converter magnetic bias analysis method, comprising the following steps: converting the voltage of the input side capacitor of the full-bridge converter into a pulse voltage through the switching network of the full-bridge converter; injecting the pulse voltage into the resonant inductance of the full-bridge converter; measuring the voltage signal and the current signal of the resonant inductance; and analyzing the measured voltage signal and current signal to realize the direct current magnetic bias analysis of the full-bridge converter. The application injects the alternating voltage with positive and negative conversion into the resonant inductance to obtain the voltage and current waveforms, analyzes the voltage deviation of the positive and negative half cycles, obtains the reason for the magnetic bias of the full-bridge direct current converter, provides the basis for the design and selection of the resonant inductance, and effectively improves the reliability of the system.

The invention relates to the technical field of magnetic deflection mass spectrometers and magnetic analyzers, and discloses a high-resolution magnetic deflection mass spectrometer magnetic analyzer which comprises an analyzer shell, and a vacuum cavity for ion movement is formed in the analyzer shell. According to the high-resolution magnetic deflection mass spectrometer magnetic analyzer, through the inlet slit, the middle slit and the outlet slit which are sequentially arranged along an ion deflection track, an ion beam firstly passes through the narrower inlet slit, ions with smaller spatial dispersity are preliminarily screened out, and then the ions enter the magnetic field; the ions pass through a middle slit and an outlet slit which are also narrower to complete a 180-degree semicircular deflection track and then reach a receiver, and inlet-middle-outlet three-stage cooperative limiting holes jointly form three-stage space screening, so that the ions which deviate from an ideal track due to energy and angle dispersion can be gradually filtered in stages; ions deviating from an ideal track due to energy and angle dispersion are effectively filtered out, and compared with single screening of a traditional design, the mass resolution of an instrument is effectively improved.

The invention relates to the technical field of unconventional shale oil and gas reservoir exploration, in particular to a method, a device, equipment and a medium for predicting the imbibition utilization efficiency of interlayer type shale oil. According to the method disclosed by the invention, the imbibition utilization efficiency of the interlayer type shale oil can be quickly predicted, and an effective means is provided for revealing an interaction reaction mechanism of shale oil reservoir rock and an injected medium, a shale oil reservoir rock imbibition oil extraction mechanism, a shale oil reservoir recovery efficiency improving mechanism and the like. According to the present invention, the imbibition oil discharge indoor test under the oil reservoir temperature and pressure condition is combined with the two-dimensional nuclear magnetic analysis, and the use conditions of the crude oil in different aperture spaces are distinguished according to the two-dimensional nuclear magnetic T1 and T2 spectrograms of the nuclear magnetic diagnosis, such that the respective imbibition oil discharge efficiency functions and the overall critical use lower limit of different aperture intervals are established so as to be adopted as the data volume model; the invention provides a method for rapidly predicting the imbibition utilization efficiency of the interlayer type shale oil by using a two-dimensional nuclear magnetic technology under the conditions of rapidness, accuracy and no damage to the rock core.

This application discloses a magnetic analyzer and an ion implanter. The magnetic analyzer includes an ion beam channel, which includes a flight zone and a first inner wall and a top wall surrounding the flight zone. The ion beam channel includes a first partition disposed between the first inner wall and the flight zone. The first partition has multiple first through holes, and a receiving space is formed between the first partition and the first inner wall. This application not only significantly reduces the probability of contaminant particles being carried out of the magnetic analyzer, thereby effectively avoiding ion implantation process failure, but also greatly extends the manual maintenance cycle or spare parts replacement cycle, thus effectively reducing maintenance costs.