19 results about "Magnetic susceptibility" patented technology

The fusion adaptive dynamic prior information magnetotelluric and magnetic method joint inversion method belongs to the field of geophysical data processing and inversion technology; by constructing a joint inversion objective function including data fitting term, model constraint term and physical coupling term, and using Gauss-Newton method for solving, the core innovation lies in introducing adaptive dynamic prior information extraction technology; the method can automatically generate and optimize prior constraints from data itself and intermediate results, without relying on external preset information, thereby significantly improving the accuracy and reliability of the boundary description and physical property recovery of underground abnormal bodies (such as resistivity, magnetic susceptibility anomaly); solve the problem that the traditional physical property coupling joint inversion technology has strong dependence on prior information and weak application generalization ability in information missing area.

This invention discloses a three-dimensional modeling and visualization method based on gravity and magnetic data, relating to the field of geophysical exploration technology. The method includes the following steps: performing multi-scale decomposition processing on gravity and magnetic anomaly data to weaken the volume field superposition effect; constructing a three-dimensional grid model of the study area based on the spatial distribution of surface observation data, using the density and magnetic susceptibility of each grid cell as model variables to be inverted, and reducing the impact of superposition effect on subsurface exploration modeling through multiple gravity and magnetic field components with different depth sensitivities, providing high-quality input for the constructed three-dimensional grid model; then inverting the three-dimensional grid model, and introducing differentiated weight constraints during the inversion process to improve the resolution and stability of the subsurface physical property distribution inversion, and enhance the accuracy of inferring subsurface geological properties.

The fusion adaptive dynamic prior information magnetotelluric and magnetic method joint inversion method belongs to the field of geophysical data processing and inversion technology; by constructing a joint inversion objective function including data fitting term, model constraint term and physical property coupling term, and using Gauss-Newton method for solving, the core innovation lies in introducing adaptive dynamic prior information extraction technology; the method can automatically generate and optimize prior constraints from data itself and intermediate results, without relying on external preset information, thereby significantly improving the accuracy and reliability of the boundary description and physical property recovery of underground abnormal bodies (such as resistivity, magnetic susceptibility anomaly); solve the problem that the traditional physical property coupling joint inversion technology has strong dependence on prior information and weak generalization ability in information missing area.

The application belongs to the technical field of geophysical magnetic exploration, and specifically discloses a method and device for reconstructing crust temperature distribution based on magnetic anomaly, which comprises the following steps: obtaining a magnetic susceptibility-temperature curve based on rock physical experiments, combining a preset temperature-depth relationship to construct a depth-dependent magnetic susceptibility function, and taking the depth-dependent magnetic susceptibility function as a magnetic susceptibility structure constraint for magnetic anomaly forward modeling and inversion; inputting magnetic anomaly grid data and the depth-dependent magnetic susceptibility function into a spatial domain forward modeling and inversion framework established based on a Cauchy-type curved area integral, constructing a target functional, iteratively solving by using a reweighted regularization conjugate gradient algorithm, and obtaining an equivalent intracrust depth distribution; taking the equivalent intracrust depth distribution as a first isothermic surface, combining a surface boundary temperature and a temperature boundary taking the Moho as a second isothermic surface, reconstructing a regional three-dimensional crust temperature structure, and outputting a temperature distribution result. The application can improve the calculation efficiency of intracrust inversion and the geological reliability of the result.

The present invention provides an apparatus (10j) and method for separating different chemical species from each other when they are suspended or entrained in liquid metal as solid particles. The apparatus (10j) comprises a vessel (2) for containing liquid metal. The vessel (2) is continuously axially symmetric about a longitudinal axis (Z), and at least part of it tapers to an apex. The vessel (2) comprises an inlet (4) for the liquid metal having suspended or entrained therein, particles of a plurality of different chemical species of respectively different densities each in solid phase, an underflow outlet (5) for the liquid metal with a majority of particles of a first, denser one of the plurality of different chemical species suspended or entrained therein, and an overflow outlet (6) for the liquid metal with a majority of particles of a second, less dense one of the plurality of different chemical species suspended or entrained therein. The underflow outlet (5) is nearer to the apex of the vessel (2) than the overflow outlet (6). The apparatus (10j) also comprises a first electrode (12) coaxial with the longitudinal axis (Z) of the vessel (2), one or more second electrodes (14) spaced apart from the first electrode (12), and a source (17) of a magnetic field. The first and one or more second electrodes (12, 14) each have a magnetic susceptibility with an absolute value of less than 10-2 to avoid disturbing the magnetic field. They are arranged within the vessel (2) to be immersed in the liquid metal when the vessel (2) contains the same, thereby allowing an electrical current (I) to flow through the liquid metal between the first and one or more second electrodes (12, 14). The magnetic field has a major component which is substantially perpendicular to the flow of electrical current (I) through the liquid metal between the first and one or more second electrodes (12, 14). This generates a Lorentz force acting on the liquid metal, causing it to rotate around the longitudinal axis (Z) of the vessel (2). The method may be conducted using such an apparatus. The speed of rotation of the liquid metal is varied by altering the Lorentz force acting on it until the liquid metal forms a vortex inside the vessel (2), which separates the particles of the different chemical species from each other and directs them to a respective one of the underflow or overflow outlets according to their different densities. If the different chemical species also have different magnetic susceptibilities from each other, the magnetic field can act directly on the particles as well in different manners according to their different susceptibilities, thus enhancing their separation according to their different densities. For example, the liquid metal may comprise liquid sodium and the solid particles may comprise the insoluble reaction products from a redox reaction between the liquid sodium and an ore of iron and / or of manganese, in which the liquid sodium acts on the ore as a chemical reducing agent and excess unreacted liquid sodium acts as a transport medium for the insoluble reaction products.

This invention discloses a method and system for identifying tectonic mineralization models based on multi-scale aeromagnetic data processing, relating to the field of geological and mineral exploration technology. The method includes: collecting and preprocessing regional and local-scale raw aeromagnetic data; decomposing standardized aeromagnetic data into multiple components at different scales using the db4 wavelet basis, corresponding to geological body information at different depths; performing targeted interference removal on each scale component using adaptive threshold filtering; extracting magnetic anomaly information using anomaly enhancement technology; quantifying and extracting multi-scale tectonic information based on magnetic anomalies and known geological data, and performing apparent magnetic susceptibility imaging inversion; establishing a magnetic anomaly feature library for typical mineralization models and constructing a multi-scale tectonic-mineralization correlation model; constructing a discrimination model using a random forest algorithm, outputting the mineralization model type, mineralization potential level, and favorable target area, and verifying the results. This invention solves the problems of incomplete tectonic identification, inaccurate interference removal, and strong subjectivity in mineralization identification inherent in traditional methods.

The application relates to the technical field of magnetic measurement, and discloses a method for measuring AC magnetic susceptibility, which comprises the following steps: controlling a first excitation coil and a second excitation coil arranged in pairs in an alternating gradient magnetometer to generate a uniform alternating magnetic field in a sample seat region; when frequency conversion testing is performed, the frequency of the uniform alternating magnetic field is adjusted, and a first induction signal of a differential detection coil is acquired; wherein the sample seat is located in a measurement region of the differential detection coil; and the AC magnetic susceptibility of a sample is acquired according to the first induction signal. By multiplexing the device structure of the alternating gradient magnetometer, a uniform alternating magnetic field is generated in the sample seat region as an alternating magnetic field source for measuring the AC magnetic susceptibility of the sample, and the differential detection coil can be integrated into the alternating gradient magnetometer. An alternating magnetic field source and a detection system do not need to be additionally arranged, and the cost of measuring the AC magnetic susceptibility is reduced. The application further discloses a device for measuring AC magnetic susceptibility, a magnetic measurement device and a computer readable storage medium.

A method for measuring relative concentrations of materials in a mixture includes providing an emission coil and at least one reception coil, providing a mixture with n materials having different magnetic susceptibilities, and introducing the mixture into the reception coil. Using a voltage generator the emission coil is supplied with at least one nonzero excitation frequency so as to generate an excitation magnetic field and the signal of the voltage induced in the reception coil is measured. Relative concentrations of the n materials are determined based on comparison between the overall susceptibility of the mixture as obtained through the voltage measurement and that of a reference mixture for which the relative concentrations of the n materials are known.

This invention discloses a method and system for estimating the time of bloodstain traces in judicial practice, relating to the fields of forensic identification and physical evidence technology. The invention acquires spatial distribution AC magnetic susceptibility tensor data of bloodstains and pure substrate magnetic signal array data; constructs a background noise covariance matrix and inputs it into an adaptive Wiener filter model to perform deconvolution separation, generating pure bloodstain intrinsic magnetic susceptibility spectrum data stripped of background interference; performs nonlinear fitting processing on the spectrum data using the fractional-order Haveryak-Nicaraguan relaxation equation, analytically generating relaxation dynamics feature set data; maps this data to a high-dimensional space of a Riemannian manifold to perform geodesic distance optimization calculation, outputting the bloodstain retention time corresponding to the minimum distance. This invention achieves non-destructive, non-contact detection, completely eliminates magnetic field interference from complex substrates, overcomes the measurement distortion of high-dimensional biochemical features, and significantly improves the accuracy and robustness of time estimation.

The present invention provides an electrolytic cell suitable for electrolysing certain inorganic compounds of alkali and alkaline earth (Group 1 and Group 2) metals in their molten state. The cell (100) comprises a vessel (102) for containing a molten electrolyte, an anode (10) and a cathode (70) both inside the vessel (102), and a source (20) of a magnetic field having a gradient with a positive component in a direction (– x) from the anode (10) to the cathode (70), such that the strength of the magnetic field increases from the anode (10) to the cathode (70). The rest of the electrolytic cell (100), apart from the source of the magnetic field, including at least both the vessel (102) and the anode (10), consists of material having a magnetic susceptibility with an absolute value of less than 10-2. Thus the rest of the electrolytic cell, which is made of diamagnetic and / or paramagnetic material(s), does not affect the magnetic field between the anode (10) and the cathode (70) to any appreciable extent in comparison to the same magnetic field in free space. The source of the magnetic field between the anode (10) and the cathode (70) may either be a permanent magnet (20) located outside the vessel (102) adjacent to the cathode (70), or it may be provided by permanently magnetizing the cathode (70) itself. In the latter case, the cathode comprises an electrically conducting "hard" ferromagnetic material with a high Curie temperature. In the former case, the cathode instead consists of an electrically conducting material also having a magnetic susceptibility with an absolute value of less than 10-2, so as not to affect the magnetic field from the permanent magnet (20) located outside the vessel (102). In either case, if such a cell (100) is used to electrolyse a halide of an alkali metal, a halide of an alkaline earth metal except beryllium or a hydroxide of an alkali metal in their molten state, the magnetic field between the anode (10) and the cathode (70) inhibits a back-reaction between the electrolysis products formed at the anode (10) and cathode (70), thereby improving the energy efficiency of the cell. A plurality of such cells (100) may also be arranged with just one permanent magnet (20) as the source of the magnetic field between the anode (10) and cathode (70) inside the respective vessels (102) of two adjacent electrolytic cells (100), thereby halving the total number of magnetized components which are used. [Fig. 4A]

The present invention provides an electrolytic cell suitable for electrolysing certain inorganic compounds of alkali and alkaline earth (Group 1 and Group 2) metals in their molten state. The cell (100) comprises a vessel (102) for containing a molten electrolyte, an anode (10) and a cathode (70) both inside the vessel (102), and a source (20) of a magnetic field having a gradient with a positive component in a direction (– x) from the anode (10) to the cathode (70), such that the strength of the magnetic field increases from the anode (10) to the cathode (70). The rest of the electrolytic cell (100), apart from the source of the magnetic field, including at least both the vessel (102) and the anode (10), consists of material having a magnetic susceptibility with an absolute value of less than 10-2. Thus the rest of the electrolytic cell, which is made of diamagnetic and / or paramagnetic material(s), does not affect the magnetic field between the anode (10) and the cathode (70) to any appreciable extent in comparison to the same magnetic field in free space. The source of the magnetic field between the anode (10) and the cathode (70) may either be a permanent magnet (20) located outside the vessel (102) adjacent to the cathode (70), or it may be provided by permanently magnetizing the cathode (70) itself. In the latter case, the cathode comprises an electrically conducting "hard" ferromagnetic material with a high Curie temperature. In the former case, the cathode instead consists of an electrically conducting material also having a magnetic susceptibility with an absolute value of less than 10-2, so as not to affect the magnetic field from the permanent magnet (20) located outside the vessel (102). In either case, if such a cell (100) is used to electrolyse a halide of an alkali metal, a halide of an alkaline earth metal except beryllium or a hydroxide of an alkali metal in their molten state, the magnetic field between the anode (10) and the cathode (70) inhibits a back-reaction between the electrolysis products formed at the anode (10) and cathode (70), thereby improving the energy efficiency of the cell. A plurality of such cells (100) may also be arranged with just one permanent magnet (20) as the source of the magnetic field between the anode (10) and cathode (70) inside the respective vessels (102) of two adjacent electrolytic cells (100), thereby halving the total number of magnetized components which are used.

The application discloses a preparation method of large-size molybdenum rod based on low magnetic susceptibility molybdenum powder, which comprises the following steps: preparing low magnetic susceptibility molybdenum powder through vacuum purification; obtaining a molybdenum powder green body through static pressure forming; preparing a high-density molybdenum blank through vacuum segmented sintering; obtaining a heat-treated molybdenum blank through segmented heat treatment; obtaining a molybdenum rod rough blank through multi-pass temperature control forging; and obtaining a large-size low magnetic susceptibility molybdenum rod after vacuum annealing. The preparation method of the large-size molybdenum rod based on the low magnetic susceptibility molybdenum powder removes ferromagnetic impurities such as Fe, Ni and Co in the molybdenum powder from the source through vacuum purification, so that the total content of the impurities is less than or equal to 5 ppm, the oxygen content is less than or equal to 20 ppm, the magnetic susceptibility of the molybdenum rod is fundamentally reduced, and the magnetic susceptibility of the finished product is less than or equal to 1.0*10 ‑6 emu / g; the cold isostatic pressing and the vacuum segmented sintering process improve the density of the large-size molybdenum blank, the relative density is greater than or equal to 99.5%, and there are no defects such as pores and internal cracks.

This invention provides an electric field-assisted high-pressure oil displacement monitoring device and method compatible with nuclear magnetic resonance imaging, belonging to the field of oil and gas extraction monitoring technology. The device includes a high-pressure holder body, a magnetic susceptibility matching electrode system, and an electromagnetic compatibility filter network. The method includes loading a core, baseline acquisition, obtaining a first image through conventional displacement, obtaining a second image by applying an electric field, and comparing and analyzing the electric field utilization. This invention solves the imaging interference problem under the coexistence of strong electric and magnetic fields by using electrode magnetic susceptibility matching, a hydrogen-free insulating medium, and bidirectional filtering isolation, achieving high-resolution in-situ monitoring of the electric field-assisted oil displacement process and quantitative analysis of the degree of remaining oil utilization.

A system of diagnosing internal characteristics of a device includes a magnetic shield, a solenoid positioned within the magnetic shield, and one or more sensors positioned within the magnetic shield and outside the solenoid. The device is removably positioned within the solenoid and induced magnetic fields are received by the one or more sensors.

The application discloses a kind of magnetic compatible β-Zr type biomedical alloys and its preparation method and application, the chemical composition of the biomedical alloy is calculated as follows by weight percentage: niobium 21.0~23.0%, copper 2.8~15.2%, the balance is zirconium and inevitable impurities.The β-Zr type biomedical alloy of the application has lower magnetic susceptibility than the currently commonly used biomedical alloy, and lower elastic modulus, and there is no biological toxic element, can better serve the magnetic resonance imaging technology under higher magnetic field.

The present invention provides a plurality (1q) of electrolytic cells suitable for electrolysing certain inorganic compounds of alkali and alkaline earth (Group 1 and Group 2) metals in their molten state. The cells (100) each comprise a vessel (102) for containing a molten electrolyte, an anode (10) and a cathode (70) both inside the vessel (102), wherein an interior of a first one of the vessels is in thermal contact with an interior of another one of the vessels via the respective vessels, and during use of the electrolytic cells, the interior of the first one of the vessels is substantially in thermal equilibrium with the interior of the other one of the vessels. Preferably, at least one of the cells further comprises a source (20) of a magnetic field having a gradient with a positive component in a direction (– x) from the anode (10) to the cathode (70), such that the strength of the magnetic field increases from the anode (10) to the cathode (70). The rest of the electrolytic cell (100), apart from the source of the magnetic field, including at least both the vessel (102) and the anode (10), consists of material having a magnetic susceptibility with an absolute value of less than 10-2. Thus the rest of the electrolytic cell, which is made of diamagnetic and / or paramagnetic material(s), does not affect the magnetic field between the anode (10) and the cathode (70) to any appreciable extent in comparison to the same magnetic field in free space. The source of the magnetic field between the anode (10) and the cathode (70) may either be a permanent magnet (20) located outside the vessel (102) adjacent to the cathode (70), or it may be provided by permanently magnetizing the cathode (70) itself. In the latter case, the cathode comprises an electrically conducting "hard" ferromagnetic material with a high Curie temperature. In the former case, the cathode instead consists of an electrically conducting material also having a magnetic susceptibility with an absolute value of less than 10-2, so as not to affect the magnetic field from the permanent magnet (20) located outside the vessel (102). In either case, if such a cell (100) is used to electrolyse a halide of an alkali metal, a halide of an alkaline earth metal except beryllium or a hydroxide of an alkali metal in their molten state, the magnetic field between the anode (10) and the cathode (70) inhibits a back-reaction between the electrolysis products formed at the anode (10) and cathode (70), thereby improving the energy efficiency of the cell. A plurality of such cells (100) may also be arranged with just one permanent magnet (20) as the source of the magnetic field between the anode (10) and cathode (70) inside the respective vessels (102) of two adjacent electrolytic cells (100), thereby halving the total number of magnetized components which are used.

The embodiment of the application discloses a method and device for constructing a magnetic susceptibility weighted map. The method comprises: acquiring initial magnetic resonance image data of a brain region of a target object based on a magnetic susceptibility weighted imaging technology, wherein the initial magnetic resonance image data comprises initial amplitude image data and initial phase image data; determining phase mask image data according to the initial phase image data, acquiring an initial value of N, multiplying the Nth power of the phase mask image data and the initial amplitude image data according to the initial value of N, and obtaining an initial magnetic susceptibility weighted map corresponding to the initial magnetic resonance image data; dividing the initial magnetic susceptibility weighted map into a plurality of regions of interest, and respectively determining a target value of N of the phase mask image data corresponding to each region of interest according to the initial value of N; and updating the initial magnetic susceptibility weighted map according to each region of interest and the target value of N of the phase mask image data corresponding to each region of interest.

To provide a novel soft magnetic material that is lower in density and has superior shapeability compared to existing soft magnetic materials. [Solution] Using hematite as the essential raw material and silica, alumina, and calcium oxide as secondary raw materials, the raw material mixture is adjusted in atomic fraction (%) to be i) 15% to 40%, ii) 0.1% to 21% aluminum, iii) 0.1% to 15% calcium, iv) the total of iron, silicon, aluminum, and calcium is 90% or more, and v) the difference between the total content of aluminum and calcium and the iron content is minus 6% or more. This raw material mixture is heated to approximately 1500°C to melt, held for approximately 1 hour, and then rapidly cooled to obtain a material with a density of 3.0 g / cm³. 3 The following, and with a mass magnetic susceptibility of 1.9 cm², 3 We were able to obtain a novel amorphous magnetic inorganic composition with a value of 1 / g or higher.