Abstract: The present application proposes a method and apparatus for transfer learning-based localization of igneous carbonate-hosted rare earth mineralization. The technology relates to electromagnetic exploration and includes obtaining exploration data for electric, magnetic, seismic, and gravity methods in the target area. Transfer learning-based localization is applied to the electric, magnetic, seismic, and gravity exploration data to determine the cross-sectional map corresponding to the anomalous position of igneous carbonate-hosted rare earth mineralization in the target area. Feature decomposition dimensionality reduction, feature enhancement, and weighted fusion processing are applied to the cross-sectional map, followed by segmentation of the igneous carbonate-hosted rare earth mineralization geological body in the fused image to obtain the spatial distribution of the detection target.

Abstract: An electrical source transient electromagnetic data imaging method, a device and a system thereof and a storage medium are provided. The method includes following steps: step S1, observing horizontal electric field ex and vertical induced voltage vz at a same measuring point; step S2, respectively obtaining first derivatives of time t for the horizontal electric field ex and the vertical induced voltage vz; step S3, calculating full-period apparent resistivity according to the first derivatives; and step S4, performing time-depth conversion according to the full-period apparent resistivity to realize apparent resistivity depth imaging.

Abstract: Three-dimensional inversion method and device for electrical source transient electromagnetic data, and a storage medium are provided. The method includes: step S1, collecting a vertical induced voltage vz and a horizontal electric field ex of electrical source transient electromagnetic; step S2, calculating, by using the vertical induced voltage vz and the horizontal electric field ex, an all-time apparent resistivity; step S3, performing, according to the all-time apparent resistivity, time-frequency conversion to obtain frequency-apparent resistivity data of each observation point; and step S4, performing three-dimensional inversion on the frequency-apparent resistivity data by using a three-dimensional magnetotelluric inversion algorithm.

Abstract: A dynamic adaptive learning method for mineral prediction includes: collecting a dataset including geological data and labels of the geological data; extracting features from the geological data, initializing parameters of a training model and optimizing the parameters to obtain training parameters; performing an associative training on the training model based on the training parameters and the labels in a dynamic adaptive learning framework to obtain a mineral prediction model, algorithms of the associative training including a variational expectation algorithm and a variational maximization algorithm, and the variational expectation algorithm including an unsupervised learning mode, a semi-supervised learning mode, and a fully supervised learning mode; and predicting, by using the mineral prediction model, a mineral to obtain a mineral prediction result.

Abstract: Disclosed are a low-noise, short-offset transient electromagnetic receiving conditioning circuit and a receiver. The conditioning circuit includes: a first power supply filtering circuit, a second power supply filtering circuit, an active filtering circuit, a power frequency noise suppression circuit, and a low-noise amplification circuit. The first and second power supply filtering circuits are used to filter the first and second power supplies, respectively, to reduce noise. The active filtering circuit is designed to filter out interference signals. The power frequency noise suppression circuit is used to eliminate power frequency noise. The low-noise amplification circuit includes an input-stage amplification circuit, an intermediate-stage amplification circuit, and an output-stage amplification circuit. The technical solution of this disclosure incorporates multiple filtering circuits to remove noise, thereby facilitating noise reduction.

Abstract: A borehole-to-surface near-source transient electromagnetic high-precision exploration method pioneers a BSEM acquisition method, obtained high-precision electrical data is processed and interpreted, which is a technological innovation and breakthrough in applying electrical exploration for gas-water differentiation in low-porosity, low-permeability gas reservoirs. The high-precision electrical gas-water differentiation method serves as a novel and effective gas-water differentiation approach complementary to conventional borehole/well logging and seismic exploration, it enables direct qualitative and quantitative evaluation of gas-bearing targets and is a gas-water differentiation technology that can indicate boundaries and scopes of the gas-bearing targets, thus can provide high-confidence gas-rich target indications for development of borehole pattern arrangement, especially horizontal borehole/well arrangement, and achieve the goal of efficient development with fewer borehole/wells but higher yields.

Abstract: Provided are a lithology identification method, a lithology identification device, an electronic apparatus and a non-transitory storage medium. The lithology identification method includes: obtaining a dataset, where the dataset includes feature sets and lithology labels, and each feature of the feature sets corresponds spatially one-to-one with a corresponding one of the lithology labels; performing locality preserving projections (LPP) on the dataset, to thereby obtain a preprocessed dataset; and constructing a machine learning model, and training the machine learning model by using the preprocessed dataset to obtain a recognition model for lithology identification, during a process for training the machine learning model, a distance constraint and a geological constraint are introduced sequentially.

Abstract: The present application proposes a method and apparatus for transfer learning-based localization of igneous carbonate-hosted rare earth mineralization. The technology relates to electromagnetic exploration and includes obtaining exploration data for electric, magnetic, seismic, and gravity methods in the target area. Transfer learning-based localization is applied to the electric, magnetic, seismic, and gravity exploration data to determine the cross-sectional map corresponding to the anomalous position of igneous carbonate-hosted rare earth mineralization in the target area. Feature decomposition dimensionality reduction, feature enhancement, and weighted fusion processing are applied to the cross-sectional map, followed by segmentation of the igneous carbonate-hosted rare earth mineralization geological body in the fused image to obtain the spatial distribution of the detection target.

Abstract: The present disclosure provides an apparent resistivity-depth section generating method for short-offset electromagnetic exploration, including: determining, in field zones divided quantitatively based on the induction number, positions of a recording point for each of observation points and frequencies or a time window thereof, and taking determined positions of the recording point as the assignment point for the observation point and the frequencies or the time window thereof, where one survey line of an axial configuration generates one apparent resistivity-depth section along the survey line; and one survey line of an equatorial configuration typically generates one apparent resistivity-depth section along the survey line, and apparent resistivity-depth sections along connecting lines from the observation points to the source which are the same as observation points in the number.

Abstract: Disclosed are a multi-line source ground-borehole transient electromagnetic detection method and a multi-line source ground-borehole transient electromagnetic detection device. The method includes following steps: S1, constructing a multi-line source ground-borehole transient electromagnetic forward model; S2, obtaining multi-line source ground-borehole transient electromagnetic responses of an underground target layer by the multi-line source ground-borehole transient electromagnetic forward model; and S3, recognizing the underground target layer according to electromagnetic diffusion characteristics of the multi-line source ground-borehole transient electromagnetic responses. A resolution and a detection capability of the underground target by a ground-borehole transient electromagnetic method is greatly improved by adopting technical schemes.

Abstract: Provided are a geological target identification method and apparatus based on image information fusion.

Abstract: The present disclosure provides an apparent resistivity-depth section generating method for short-offset electromagnetic exploration, including: determining, in field zones divided quantitatively based on the induction number, positions of a recording point for each of observation points and frequencies or a time window thereof; and taking determined positions of the recording point as the assignment point for the observation point and the frequencies or the time window thereof, where one survey line of an axial configuration generates one apparent resistivity-depth section along the survey line; and one survey line of an equatorial configuration typically generates one apparent resistivity-depth section along the survey line, and apparent resistivity-depth sections along connecting lines from the observation points to the source which are the same as observation points in the number.

Abstract: Disclosed are a multi-line source ground-borehole transient electromagnetic detection method and a multi-line source ground-borehole transient electromagnetic detection device. The method includes following steps: S1, constructing a multi-line source ground-borehole transient electromagnetic forward model; S2, obtaining multi-line source ground-borehole transient electromagnetic responses of an underground target layer by the multi-line source ground-borehole transient electromagnetic forward model; and S3, recognizing the underground target layer according to electromagnetic diffusion characteristics of the multi-line source ground-borehole transient electromagnetic responses. A resolution and a detection capability of the underground target by a ground-borehole transient electromagnetic method is greatly improved by adopting technical schemes.

Abstract: The disclosure pertains to the field of exploration based on electromagnetic method, and in particular relates to a method and device for surface-borehole transient electromagnetic detection, aiming at solving the problem that the loop source device cannot effectively detect the high-resistance layer. The device according to the disclosure includes grounded conductor wires as emission sources and underground receiving devices as receiving sources; wherein the grounded conductor wires are arranged on the ground; an existing borehole on the ground or an existing underground roadway is used, and receiving probes are arranged point by point in the borehole direction or in the horizontal direction of the roadway; the grounded conductor wires are composed of three sets of grounded conductor wires, wherein two sets of the grounded conductor wires are arranged in parallel with each other and perpendicular to the third set of the grounded conductor wires.

Abstract: The disclosure pertains to the field of electromagnetic exploration, and in particular relates to a device and method for ground source transient electromagnetic near-field detection and related device, with the purpose of solving the problems that the method for loop source transient electromagnetic detection has a relatively small detection depth and weak signals. The device of the disclosure includes an excitation source emitting device and a receiving device for signal detection. The excitation source emitting device includes an emission source, the emission source is a grounded conductor wire; the grounded conductor wire is used to convert a bipolar pulsed current into an electromagnetic field to be emitted underground; and the receiving device is configured for detecting a magnetic field and/or electric field signal in a survey line segment of an observation range of the grounded conductor wire using the method of areal sideline scanning survey.

Abstract: The disclosure relates to a low toxic tripterygium neoglycosides, which is obtained by chemically processing tripterygium glycosides and adding triptriolide. The disclosure also discloses the application of the low toxic tripterygium neoglycosides. The tripterygium neoglycosides can effectively relieve renal pathological injury and urinary protein of nephrotic syndrome, attenuate the inflammatory level of the body, have obvious treatment effect on nephrotic syndrome, and have low toxicity and persistent effect.

Abstract: The disclosure relates to a low toxic tripterygium neoglycosides, which is obtained by chemically processing tripterygium glycosides and adding triptriolide. The disclosure also discloses the application of the low toxic tripterygium neoglycosides. The tripterygium neoglycosides can effectively relieve renal pathological injury and urinary protein of nephrotic syndrome, attenuate the inflammatory level of the body, have obvious treatment effect on nephrotic syndrome, and have low toxicity and persistent effect.

Abstract: The disclosure pertains to the field of exploration based on electromagnetic method, and in particular relates to a method and device for surface-borehole transient electromagnetic detection, aiming at solving the problem that the loop source device cannot effectively detect the high-resistance layer. The device according to the disclosure includes grounded conductor wires as emission sources and underground receiving devices as receiving sources; wherein the grounded conductor wires are arranged on the ground; an existing borehole on the ground or an existing underground roadway is used, and receiving probes are arranged point by point in the borehole direction or in the horizontal direction of the roadway; the grounded conductor wires are composed of three sets of grounded conductor wires, wherein two sets of the grounded conductor wires are arranged in parallel with each other and perpendicular to the third set of the grounded conductor wires.

Abstract: The disclosure pertains to the field of electromagnetic exploration, and in particular relates to a device and method for ground source transient electromagnetic near-field detection and related device, with the purpose of solving the problems that the method for loop source transient electromagnetic detection has a relatively small detection depth and weak signals. The device of the disclosure includes an excitation source emitting device and a receiving device for signal detection. The excitation source emitting device includes an emission source, the emission source is a grounded conductor wire; the grounded conductor wire is used to convert a bipolar pulsed current into an electromagnetic field to be emitted underground; and the receiving device is configured for detecting a magnetic field and/or electric field signal in a survey line segment of an observation range of the grounded conductor wire using the method of areal sideline scanning survey.

Abstract: An apparatus comprises a body that extends longitudinally between a top end and a bottom end, an elongate slot disposed in an outer surface of the body and having first and second spaced-apart detents, and a cap disposed coaxially around the body and having a cut therein that defines an elongate arm. The elongate arm has an inwardly-oriented protrusion configured to engage the detents of the slot. The cap is slidable along the body such that the inwardly-oriented protrusion slides along the slot until it detachably engages a detent, thereby retaining the cap in either a closed position that covers the bottom end or an open position in which the bottom end is exposed.