121 results about "Magnetic field gradient" patented technology

The invention provides an easy-to-scale efficient biological magnetic separation system and method and application. The magnetic separation method comprises the following steps: marking a target object in a to-be-detected suspension by adopting magnetic nanoparticles, and putting the marked to-be-detected suspension into a separation container; a modularized magnet array is arranged in the separation container, the modularized magnet array is composed of permanent magnets, and the permanent magnets are assembled into the cuboid modularized magnet array; the surface of the permanent magnet is coated with a polytetrafluoroethylene coating; the modularized magnet array moves in the suspension under the control of a driving magnet arranged outside the separation container to generate a dynamic gradient magnetic field, and a target object is captured by the modularized magnet array under the action of the gradient force of the magnetic field; removing the liquid in the separation container; adding the resuspension into a separation container, and recovering a target object by physical ultrasonic washing; or adding a chemical dissociation solution into the separation container to recover the target object.

The invention relates to the technical field of magnetic field measurement error compensation, in particular to a single-axis Hall surface magnetic rapid imaging analysis system, which is characterized in that a magnetic field gradient real-time analysis unit calculates a magnetic field gradient change rate through a sliding window weighted difference algorithm, identifies a magnetic pole transition region and analyzes the magnetic field gradient change rate. The multi-source error coupling modeling unit synchronizes Hall probe spacing fluctuation, inclination angle and magnetic field gradient data and constructs a composite compensation function, the adaptive compensation unit corrects and counteracts spacing attenuation and projection errors through two-stage assembly lines, and the nonlinear trigger control unit generates an adaptive encryption trigger signal, so that the sampling spacing decreases progressively along with the gradient change rate, and the error compensation is realized. And the magnetic field distribution reconstruction unit fuses the compensation data and the sampling sequence, reconstructs a continuous magnetic field distribution curve by adopting gradient constraint cubic spline interpolation, accurately outputs a magnetic pole boundary position and a surface magnetic field intensity quantification result, and improves the surface magnetic imaging precision and efficiency.

The invention provides a quantitative detection method and system for corrosion of steel bars in concrete, and belongs to the technical field of nondestructive testing and health monitoring of civil engineering structures. According to the method, an alternating weak magnetic field is applied to a reinforced concrete structure through a controllable magnetic field excitation device; a superconducting quantum interference magnetic sensor array is adopted to collect magnetic field response signals, and a space magnetic field gradient data set is obtained; performing wavelet packet decomposition and feature extraction on the data set to obtain a corrosion feature frequency band signal; based on a magnetic diffusion-corrosion coupling physical model, inversely calculating steel bar section corrosion rate distribution; and generating and outputting a three-dimensional corrosion distribution cloud picture and a quantitative evaluation report. The system comprises a controllable magnetic field excitation device, a superconducting quantum interference magnetic sensor array, a data processing and inversion calculation device and a result output device which are sequentially connected and cooperatively work. According to the invention, nondestructive, accurate and quantitative detection of corrosion of steel bars in concrete is realized, and the method has the advantages of strong deep penetration ability, high sensitivity to micro-corrosion, good field applicability and the like.

The invention discloses a double-spindle turning and milling combined machining center, and relates to the technical field of machine tool machining, the double-spindle turning and milling combined machining center comprises a lathe bed, the lathe bed comprises a spindle unit, the spindle unit comprises a first spindle unit and a second spindle unit, and the first spindle unit and the second spindle unit are oppositely arranged in the horizontal direction and are both in sliding connection with the lathe bed through sliding mechanisms; and the main shafts are independently connected with main shaft driving motors. Temperature field distribution of different axial positions at the front end of the main shaft is identified in real time, each annular electromagnet is independently regulated and controlled to construct a non-uniform magnetic field gradient in the electric control heat conduction pad, and the magnetic response phase change microcapsules are driven to be directionally enriched towards a high-temperature area, so that cooling capacity space distribution and thermal load space distribution are dynamically matched in real time; and the main shaft thermal drift is actively inhibited from the source.

There is provide a circular accelerator and a particle beam therapy system that can improve the beam extraction efficiency. A circular accelerator that accelerates and extracts charged particle beams circulating in a magnetic field includes a first magnetic field region in which closed trajectories of the beams with different energies are eccentric and which has a magnetic field gradient decreasing in the magnetic field toward an outer peripheral side and a second magnetic field region having a magnetic field gradient increasing in the magnetic field toward the outer peripheral side. A border between the first magnetic field region and the second magnetic field region is located on a downstream side in a traveling direction of the beam with respect to a predetermined region in which an interval between the closed trajectories of the beams with the different energies is narrowest.

The application discloses a device and method for compensating magnetic field gradient of a segmented dDNP polarization system, which comprises a gradient monitoring module and a dynamic compensation module. The gradient monitoring module comprises a magnetic sensor combination, which comprises at least two magnetic sensors distributed along the transfer path direction of a sample, and the magnetic sensors are used for detecting a first gradient magnetic field corresponding to the transfer path of the sample. The dynamic compensation module comprises a segmented gradient coil, which is arranged along the transfer path of the sample to form multiple independent coil units. The current of each independent coil unit is independently adjusted according to the first gradient magnetic field, so that the segmented adjustment and overall homogenization of the magnetic field gradient of the transfer path are realized. The dynamic magnetic field gradient inside the polarizer is measured in real time by using the magnetic sensor combination, and the precise compensation of the gradient magnetic field is realized through the reverse compensation of the segmented gradient coil, so that the high polarization fidelity of the sample in the transfer process is ensured.

The invention relates to the technical field of water treatment, and discloses an intelligent response type mine wastewater treatment system which comprises a physical treatment subsystem and a control subsystem. The control subsystem calculates a normalized effective contact efficiency factor and a fluid drag strength factor based on the collected fluid flux and source frequency data. The calculation module adjusts the mechanical shear power of the mixing unit according to the effective contact efficiency factor, and keeps the Damkler number in the reaction system constant so as to compensate the contact time loss; and adjusting the excitation current of the separation unit according to the fluid drag strength factor, constructing a dynamic magnetic field gradient balanced with a fluid drag force vector, and executing pre-excitation when an impact precursor is identified. When the fluid drag strength exceeds a physical limit, the system controls the dosing interface to perform supersaturated dosing. Through cooperative regulation and control of a multi-dimensional physical field and chemical potential energy, rapid response and stable treatment of the unsteady hydraulic load are achieved.

The invention discloses an online magnetic separation device for packaging aluminum foil casting melt inclusions, and relates to the field of material magnetic separation. An on-line magnetic separation device for packaging aluminum foil casting melt inclusions comprises a separation box and further comprises an installation box fixedly connected in a feeding port of the separation box, a magnetic separation device and a control device, the multiple groups of flow guide pipes are all mounted in the mounting box, each flow guide pipe is provided with a hollow pipeline, and the hollow pipelines of the flow guide pipes are used for guiding a liquid solution to enter the separation box; a cavity is formed in the flow guide pipe, and a high-temperature-resistant electromagnet is installed in the cavity. The spiral groove is formed in the hollow pipeline of the flow guide pipe; through the flow guide pipe with the spiral groove, impurities are adsorbed in a gradient mode through a magnetic field in the spiral groove, the magnet does not make direct contact with a melt or the impurities, mechanical abrasion is avoided, only the flow guide pipe needs to be replaced during follow-up replacement, the high-temperature-resistant electromagnet can be reserved, and resources are effectively saved.

A traceable multi-mode extremely weak magnetic field measuring device and method, comprising helium-3 atoms and an atomic magnetometer in a spin-exchange relaxation-free state, the helium-3 atoms polarized by metastable exchange optical pumping under an extremely weak magnetic field provide a traceable magnetic field value for the atomic magnetometer, the value is compared with the output response of the atomic magnetometer to obtain a calibrated scale factor of the atomic magnetometer, so that the measurement values of the atomic magnetometer are traceable. The atomic magnetometer meter head comprises four independent detection channels, the four detection channels are obtained by beam splitting of two detection lasers with different frequency detuning amounts, and the channels have high consistency. The method proposed by the application is compatible with the cooperative use of multiple probes, and can realize single-meter-head multi-channel measurement, meter-head internal magnetic field gradient measurement and meter-head inter-magnetic field gradient measurement three measurement modes, each mode has high consistency and high sensitivity.

The invention relates to a method of MR imaging of an object (10) positioned in an examination volume of a MR device (1). It is an object of the invention to enable efficient spiral MR imaging without blurring artefacts, even in situations of strong B0 inhomogeneity. The method of the invention comprises the following steps: —subjecting the object (10) to an imaging sequence comprising at least one RF excitation pulse and modulated magnetic field gradients, —acquiring MR signals along two or more planar spiral k-space trajectories (31, 32, 33), wherein the radial k-space speed, i.e. the rate of variation of the radial distance from the spiral origin is essentially constant along each planar spiral k-space trajectory, and wherein the two or more k-space trajectories (31, 32, 33) are offset in-plane from each other, and—reconstructing an MR image from the acquired MR signals. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).

A double-sided electric heating sheet magnetic field suppression configuration design method for an atomic gas chamber is used to solve the problem of the interference magnetic field and magnetic field gradient generated by the electric heating structure in the background technology. Through simultaneous optimization design of the parameters of the upper and lower heating sheets, the overall structure is formed to effectively suppress the electric heating magnetic field and improve the magnetic field uniformity. The method is characterized in that the NSGA-II algorithm based on Pareto sorting is used to simultaneously optimize the parameters of the two electric heating sheets located on the symmetric surface of the gas chamber, obtain the optimal parameter combination of the two electric heating sheets, and realize the simultaneous optimization of the wiring design of the double-sided electric heating sheets.

The invention relates to the technical field of rheological testing and material characterization, and provides a local rheological testing system and device based on electromagnetic driving and visual displacement tracking, and the system comprises a magnetic field generation module which is used for generating a stable magnetic field for magnetizing a magnetic needle in a sample area and a periodic gradient magnetic field for driving the magnetic needle, and a driving module, the magnetic field generation module is used for providing corresponding steady-state and alternating current excitation for the magnetic field generation module, and the image acquisition module is used for generating a uniform linear magnetic field gradient in a central area by a gradient field Maxwell configuration coil pair and an external trigger synchronization mechanism through the arrangement of the structures such as the gradient field Maxwell configuration coil pair and the external trigger synchronization mechanism; the driving force acting on the magnetic needle is ensured to be stable and repeatable; an external trigger synchronization mechanism controls driving signals to be strictly synchronized with image acquisition, and magnetic needle displacement and phase difference are accurately extracted by combining image recognition and a sub-pixel positioning algorithm, so that magnetic field fluctuation and time sequence errors are effectively reduced, the rheological parameter inversion precision is improved, and the problems of large errors and high cost in the prior art are solved.

The application relates to the technical field of downhole operation of oil exploitation, in particular to a lost fish head detection device and method for taking and replacing a casing, the method comprising the following steps: by collecting the magnetic variable of a downhole probe at each sampling depth, a potential interference section is first determined; then, by combining the magnetic field gradient distribution and the horizontal magnetic field direction characteristics, the magnetic field change balance degree and the direction consistency are calculated, the stratum lithology and external interference are effectively removed, and the real lost fish head section is accurately locked; finally, the horizontal distance is calculated by using the magnetic field vector weighted summation, and the fish collecting strategy is output. The application aims to improve the accuracy of fish head positioning and the fish collecting success rate.

The present invention relates to a method and a device for isolating non-magnetic cells from a heterogeneous sample solution containing biological material comprising desired and undesired cells. The method comprises the following steps: - adding magnetic or magnetizable particles to the sample, wherein the particles have a size in the range of 100 nm to 4 pm and exhibit a surface composition that supports specific binding to target cells, wherein the target cells comprise the desired cells or the undesired cells; - reducing the external magnetic field gradient; - incubating the sample solution with the magnetic particles to obtain a magnetized cell fraction; - washing the magnetized cell fraction using a washing solution to reduce non-specific binding; - increasing the external magnetic field gradient; - isolating the magnetized cell fraction of target cells from the sample; wherein the sample solution is subjected to an external magnetic field gradient throughout the adding, incubating, washing and isolating steps, and wherein the sample solution is rotated at least during the adding, incubating and washing steps.

Disclosed in the present invention are a superconducting magnet system for esophageal atresia traction anastomosis, and a method. The system comprises: a superconducting magnet device, a movable flat plate, a support, a ferromagnetic core and a permanent magnetic core, wherein the movable flat plate is movably arranged inside a central hole of the superconducting magnet device, the support is fixedly connected to the superconducting magnet device, and the ferromagnetic core and the permanent magnetic core are placed inside the central hole of the superconducting magnet device and are respectively located at a proximal esophageal end and a distal esophageal end of an esophageal atresia target; the superconducting magnet device is configured to generate a uniform magnetic field and a gradient magnetic field inside the central hole; and the ferromagnetic core and the permanent magnetic core are configured to provide opposite traction forces for the esophageal atresia target under the uniform magnetic field and the gradient magnetic field. According to the present application, by combining the uniform magnetic field, the gradient magnetic field, the ferromagnetic core and the permanent magnetic core, opposite traction forces that have adjustable magnitudes and that do not require directional adjustment are provided for the esophageal atresia target, thereby improving the traction force intensity, control flexibility and control precision.

The invention belongs to the field of superconducting magnets and intelligent control, and provides a superconducting magnet magnetic field gradient value compensation control system and method, and the system comprises a digital control subsystem, a compensation current circuit subsystem, and a dynamic magnetic field adjustment subsystem. The digital control subsystem is used for modeling a superconducting magnet magnetic field, determining an optimal parameter combination which enables a magnetic field gradient value to reach a target threshold value and has the minimum adjustment amplitude compared with an initial compensation current, and generating and outputting a first current control signal to the compensation current circuit subsystem; the compensation current circuit subsystem is used for preliminarily adjusting the magnetic field of the superconducting magnet; and the dynamic magnetic field adjusting subsystem is used for acquiring magnetic field change data and outputting a second current control signal to the compensating current circuit subsystem according to the magnetic field change data and the magnetic field distribution model, so that the compensating current circuit subsystem dynamically adjusts the magnetic field of the superconducting magnet according to the second current control signal. According to the scheme, the static precision and the dynamic stability of the magnetic field are both improved.

The invention provides a magnetic particle image generation method and electronic equipment, which can be applied to the technical field of medical image processing. The method comprises: based on a first magnetic field gradient, according to a position of interest in an initial mask image, performing narrow-band point-by-point scanning on a target object in an imaging field of view to obtain an initial magnetic particle image, the position of interest representing a position needing to be scanned in the imaging field of view; segmenting the initial magnetic particle image to obtain a segmented mask image; convolution processing is carried out on the segmented mask image to obtain an expanded mask image, and the interested position in the expanded mask image represents an object contour generated by the magnetic particles in the edge area of the segmented mask image based on migration and diffusion; based on a second magnetic field gradient, according to the interested position in the expansion mask image, narrow-band point-by-point scanning is carried out on a target object in the imaging view field, a target magnetic particle image is obtained, and the second magnetic field gradient is higher than the first magnetic field gradient.

The invention relates to a sensor head (4a-d) for a frequency analyzer (2a-d) comprising a crystal defect resonator (20a-d), an optical pump emitter (14) for exciting the crystal defect resonator (20a-d), a magnetic field unit (30) for generating a magnetic field with a magnetic field gradient along the crystal defect resonator (20a-d), an RF waveguide (22) and a radiation detector (10) for detecting luminescence radiation (42) from the crystal defect resonator (20a-d). To achieve easy manufacturability of the frequency analyzer (2a-d), it is proposed that the crystal defect resonator (20a-d) has a polycrystalline structure.

A magnetic field-assisted additive manufacturing (MFAAM) system and method for fabricating anisotropic bonded magnets. The system includes a magnetic field source assembly including a modular Halbach holder, an inner Halbach holder, and a Halbach cylinder configured to provide a magnetic field for aligning magnetic fillers within a polymer matrix during extrusion. The field gradient of the Halbach cylinder is less than 0.0005 T / mm allowing to obtain high print quality in a large magnetic field. To enable high-temperature processing, the assembly incorporates a cooling casing fluidly coupled to a cooling medium. This active thermal management maintains the Halbach cylinder below a threshold temperature while a heated nozzle extrudes the composite material at temperatures sufficient to melt high-performance polymers. The integration of the magnetic source and cooling jacket allows for the precise alignment of magnetic domains in high-viscosity matrices, resulting in 3D-printed bonded magnets with consistent magnetic anisotropy and improved structural properties.

The invention provides a multi-point grounding current-limiting switching control device and method for a transformer iron core clamp, and particularly relates to the technical field of transformer operation state monitoring and fault control, and the device comprises a distributed monitoring module, a fault positioning unit, an intelligent switching controller and a self-healing current-limiting unit. According to the invention, the distributed current sensor and the magnetic field sensor cooperatively collect data, and the fault positioning error can be controlled within 5cm by combining wavelet transform to extract high-frequency features and a magnetic field gradient algorithm, so that blind maintenance caused by inaccurate positioning in the prior art is avoided; meanwhile, three-level threshold values are dynamically corrected based on the material of the iron core and the operating age limit, temperature closed-loop adjustment is introduced, early warning can be conducted in time at the initial stage of a fault, the current limiting unit can be accurately switched according to the severity degree, unnecessary shutdown losses are reduced, and the risks of local overheating of the iron core and sharp loss increase caused by over-current limiting or under-current limiting are reduced.

An apparatus for generating magnetic field gradients, comprising (a) a first planar electromagnetic coil set configured to generate a first magnetic field gradient with respect to a first axis, (b) a second planar electromagnetic coil set configured to generate a second magnetic field gradient with respect to a second axis orthogonal to the first axis, (c) a third planar electromagnetic coil set configured to generate a third magnetic field gradient with respect to a third axis orthogonal to the first and second axes, and (d) a controller configured to selectively power the first, second, and / or third electromagnetic coil sets to sequentially generate positioning magnetic field gradients with respect to each of the first, second, and third axes, at least a portion of each positioning magnetic field gradient having a magnetic field magnitude that monotonically varies along the respective axis.

The invention provides a magnetic field control system and method for magnetic micro-group multi-branch navigation. The system comprises a control module and a magnetic field generation module. The control module obtains a first moving magnetic field gradient, a split magnetic field gradient and a second moving magnetic field gradient according to the relationship among the magnetic field gradient, the size of the magnetic microcluster and the speed, and obtains a coil current value of the magnetic field generation device according to the relationship among the coil current value, the position of the magnetic microcluster and the magnetic induction intensity; the magnetic field generation module is configured to generate a uniform rotating magnetic field based on the initial magnetic induction intensity, and drive the magnetic particles to gather to form a magnetic microcluster; navigating the magnetic micro group to an intersection of different branch positions based on a first moving magnetic field gradient; splitting the magnetic micro-group into at least two sub-magnetic micro-groups based on the split magnetic field gradient; and each sub-magnetic micro-group is navigated to different branch positions based on the second moving magnetic field gradient. According to the invention, synchronous targeted drug delivery on multi-branch focuses is realized.

This invention discloses a method and kit for detecting microbial SERS based on superhydrophobic evaporation concentration and magnetically guided enrichment, belonging to the field of in vitro diagnostics and analytical chemistry. The method includes: mixing and incubating the sample to be tested with a magnetic SERS probe modified with targeted recognition molecules to form a complex; adding the mixed droplet to a superhydrophobic surface for evaporation concentration; applying a magnetic field below the detection site during droplet evaporation, using the magnetic gradient force to directionally enrich and pin the complex to the detection site, resulting in a dense solid enrichment spot in situ after drying, creating nanoscale gaps between the metal layers of adjacent probes and exciting SERS hotspots; irradiating the spot with a laser and acquiring the SERS signal to achieve microbial detection. This invention also provides a kit for implementing this method, including a magnetic SERS probe, a superhydrophobic detection card, and a positioning base with an embedded magnet. This invention eliminates the dependence on traditional solid-phase SERS substrates, overcomes the defect of easy droplet rolling on superhydrophobic surfaces through magnetic pinning, achieves self-alignment and high-sensitivity detection, and has advantages such as strong anti-interference, low cost, and ease of automation.

The present application relates to active ingredient separation detection technical field, and disclose a kind of for Chinese yam active ingredient target fishing magnetic microsphere separation analysis device, including the sample pretreatment module, magnetic microsphere incubation combination module, magnetic field separation module, elution purification module and target analysis detection module in turn by sealed conveying pipeline communication;The magnetic field separation module is used to provide adjustable magnetic field gradient, realize the separation enrichment of the magnetic microsphere combined with active ingredient-target complex and the separation of uncombined impurities.This magnetic microsphere separation analysis device for Chinese yam active ingredient target fishing realizes the lossless, pollution prevention transmission of material between each module, completes the automatic integrated operation from Chinese yam extract processing to target qualitative and quantitative detection, greatly improves the overall work efficiency of Chinese yam active ingredient target fishing, effectively avoids the pollution risk introduced by manual operation, ensures the reliability of experimental results.

The utility model provides a moving-coil motor which comprises a rotor assembly and a stator assembly, the rotor assembly comprises a substrate and a rotating shaft, the substrate is composed of a plurality of layers of circuit boards, a first coil winding and a second coil winding are arranged on the two faces of the substrate respectively, and the first coil winding and the second coil winding are symmetrically distributed relative to the rotating shaft. The stator assembly comprises a permanent magnet set, the permanent magnet set is suspended on the outer side of the first coil winding and the outer side of the second coil winding, and when the first coil winding and the second coil winding are powered on, the first coil winding and the second coil winding repeatedly deflect with the rotating shaft as the axis. The permanent magnet group covers the deflection ranges of the two sides of the first coil winding and the second coil, the magnets are arranged on the two sides of the coil winding, so that the coils are always covered by a uniform high-strength magnetic field in the whole motion range, magnetic field gradient interference is avoided, and the dynamic response is faster and more stable; therefore, more accurate displacement and speed control can be realized, and the method is suitable for being applied to precise instruments needing high-precision positioning.

The invention discloses an environment adaptive communication system and method based on multi-physical-layer fusion, and relates to the technical field of wireless communication, and the system comprises a positioning unit which is used for obtaining the position and attitude information of a device through the fusion of a magnetic field gradient and optical flow displacement; the communication unit is used for cooperatively transmitting data through three physical layers of sound waves, visible light and magnetic induction; the awakening unit is used for realizing zero-power-consumption awakening in a geomagnetic resonance mode; and the processing unit is used for executing a positioning fusion algorithm, communication protocol scheduling and awakening logic control. The problems that in the metal environment, the positioning error of the UWB positioning technology is larger than 1 meter due to metal reflection signal interference, and the precision of underwater sonar positioning is only + / -0.5 meter due to water temperature and salinity changes are effectively solved.

The invention relates to a sensor unit (200) for measuring a magnetic field, comprising at least two sensor media (201, 202, 203) arranged at a fixed distance from each other, at least one excitation light source (220) for shining light (224) into the at least two sensor media (201, 202, 203), at least one microwave source (241, 242, 243) for generating an alternating magnetic field in the at least two sensor media (201, 202, 203), a device for generating a bias magnetic field (B0) having different magnetic field strengths at the locations of the at least two sensor media (201, 202, 203), an optical collecting device for combining fluorescent light (225) emitted from the at least two sensor media (201, 202, 203), and a photodetector (230) for detecting the combined Fluorescence light (225),at least one signal processing unit for determining a gradient of the magnetic field from the detected fluorescence light (225).,

This invention relates to the field of fatigue loss early warning technology for reinforced concrete structures, and discloses a fatigue damage early warning method, device, electronic equipment, storage medium, and program product for reinforced concrete structures. The invention acquires magnetic field data and calculates magnetic field changes and gradients by scanning sampling points of the component under test along a preset path. Combined with preset abrupt change conditions, it accurately locates dangerous areas, solving the problems of traditional methods in characterizing microscopic material damage and inability to target risks. Subsequently, it focuses on collecting magnetic field characteristic data in dangerous areas, judges structural fatigue damage based on its evolution law, and issues early warnings. This effectively avoids the shortcomings of traditional measurement methods, such as limited applicability, insufficient accuracy, and cumbersome operation, forming an efficient closed loop of location, monitoring, and early warning. It compensates for the shortcomings of existing technologies in efficiently and accurately completing assessment and early warning, significantly improving the timeliness and reliability of structural fatigue damage early warning.

The invention discloses a method and a system for reinforcing soil at fixed points by microorganisms based on magnetic navigation guidance, and relates to the technical field of geotechnical engineering. The migration path and the final gathering position of the microorganisms in the soil body are actively and accurately controlled by utilizing an external programmable magnetic field, a reinforced target spot is determined based on exploration, an electromagnetic coil array arranged on the ground surface is driven to generate a gradient magnetic field according to the three-dimensional coordinates of the target spot, the intensity of the magnetic field at the target spot is maximum, and the gradient magnetic field has the maximum density. The magnetic field gradient force pointing to the target spot is generated in the surrounding space, after the magnetized microorganism suspension is injected into the soil body, each microorganism individual becomes a tiny magnetic dipole due to magnetic particles carried by the microorganism individual, and under the action of the magnetic field gradient force, the microorganism individual is continuously dragged in the magnetic field intensity increasing direction and finally enriched in a preset target spot area. The problem that microorganisms cannot effectively reach a target area due to adsorption and filtration effects is solved.

The invention comprises a method for separating ions, comprising the steps of: providing an ion cyclotron resonance separator with a longitudinal axis; applying a magnetic field gradient along a length of the longitudinal axis; passing a single fixed radio frequency radially across the longitudinal axis; and spatially separating the ions at mass-to-charge ratio resonance locations along a length of the longitudinal axis, where the magnetic field gradient is within a range of 0 to 0.65 Tesla, where the single fixed radio frequency is maintained in a range of 40 kHz to 20 MHZ, and where the step of spatially separating further comprises the step of spiraling radially outward at a first resonance location a first set of ions, of the ions, the first set of ions comprising a first range of mass-to-charge ratios, the first resonance location comprising a first mass-to-charge ratio resonant with the applied radio frequency.