Relevant bibliographies by topics / Magnetic pole inversion

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Magnetic pole inversion'

Author: Grafiati
Published: 4 June 2025
Last updated: 1 August 2025

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Journal articles on the topic "Magnetic pole inversion"

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Wu, Jiangtao, Zuzhen Liao, Ting Sun, et al. "Tunable magnetic pole inversion in multiferroic BiFeO3–DyFeO3 solid solution." Journal of Materials Chemistry C 5, no. 16 (2017): 4063–67. http://dx.doi.org/10.1039/c7tc00512a.

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We report an unusual magnetic pole inversion behaviour in multiferroic BiFeO<sub>3</sub>–xDyFeO<sub>3</sub> solid solution, which can be tuned by varying the concentration of the magnetic ion Dy in the solid solution. It is found that the temperature-induced magnetic pole inversion occurs in a wide composition range (x = 0.14–0.90). Moreover, multiple magnetic pole inversions are observed in the solid solution compounds of high Dy-concentrations.
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Li, Jian Hua, and Zhen Xi. "Conversions of Magnetic Anomaly and 3-D Inversion at Low Magnetic Latitudes." Applied Mechanics and Materials 155-156 (February 2012): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.216.

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At low magnetic latitudes, the magnetization direction is almost horizontal, amplification effect of pole reduction factor causes band-shape fake anomaly along the direction of the magnetic declination. Experts have been solving the problem pole reduction at low magnetic latitudes (RTP-L). However, no greatly effective method has been found. The magnetic anomaly with a reduction procedure at low magnetic latitudes misleads the judgment of experts if the method is not well used. For making a reliable magnetic anomaly interpretation result at low magnetic latitudes, it is proposed that a pole re
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Liu, Run, Zihan Wang, Silu Peng, Jian Bi, Jiangtao Wu, and Zuo‐Guang Ye. "Oxygen‐vacancy‐controlled magnetic properties with magnetic pole inversion in BiFeO 3 ‐based multiferroics." Journal of the American Ceramic Society 103, no. 2 (2019): 1097–104. http://dx.doi.org/10.1111/jace.16789.

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von Frese, R. R. B., D. N. Ravat, W. J. Hinze, and C. A. McGue. "Improved inversion of geopotential field anomalies for lithospheric investigations." GEOPHYSICS 53, no. 3 (1988): 375–85. http://dx.doi.org/10.1190/1.1442471.

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Instabilities and the large matrices which are common to inversions of regional magnetic and gravity anomalies often complicate the use of efficient least‐squares matrix procedures. Inversion stability profoundly affects anomaly analysis, and hence it must be considered in any application. Wildly varying or unstable solutions are the products of errors in the anomaly observations and the integrated effects of observation spacing, source spacing, elevation differences between sources and observations, geographic coordinate attributes, geomagnetic field attitudes, and other factors which influen
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Ohkoshi, Shin-ichi, Shinsuke Yorozu, Osamu Sato, Tomokazu Iyoda, Akira Fujishima, and Kazuhito Hashimoto. "Photoinduced magnetic pole inversion in a ferro–ferrimagnet: (Fe0.40IIMn0.60II)1.5CrIII(CN)6." Applied Physics Letters 70, no. 8 (1997): 1040–42. http://dx.doi.org/10.1063/1.118475.

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Zu, Qiang, Peng Han, Peijie Wang, et al. "Three-Dimensional Magnetic Inversion Based on Broad Learning: An Application to the Danzhukeng Pb-Zn-Ag Deposit in South China." Minerals 15, no. 3 (2025): 295. https://doi.org/10.3390/min15030295.

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Three-dimensional (3-D) magnetic inversion is an essential technique for revealing the distribution of subsurface magnetization structures. Conventional methods are often time-consuming and suffer from ambiguity due to limited observations and non-uniqueness. To address these limitations, we propose a novel inversion method under the machine learning framework. First, we design a training sample generation space by extracting the horizontal positions of magnetic sources from the analytic signal amplitude and the reduced-to-the-pole anomalies of magnetic field data. We then employ coordinate tr
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Bunge, H. J. "Advantages of Neutron Diffraction in Texture Analysis." Textures and Microstructures 10, no. 4 (1989): 265–307. http://dx.doi.org/10.1155/tsm.10.265.

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Neutron diffraction texture analysis is based on pole figure measurement followed by pole figure inversion. Neutron diffraction pole figure measurement is quite similar to that by X-rays. There are, however, several advantages in detail which are mainly due to the lower absorption coefficient. Besides these quantitative differences, there is one principle difference between the two methods. Neutron diffraction allows the magnetic texture to be measured which is not possible by X-rays. The paper gives a survey on the advantages of neutron diffraction texture analysis which are only counteracted
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Ohkoshi, Shin-ichi, Ken-ichi Arai, Yusuke Sato, and Kazuhito Hashimoto. "Humidity-induced magnetization and magnetic pole inversion in a cyano-bridged metal assembly." Nature Materials 3, no. 12 (2004): 857–61. http://dx.doi.org/10.1038/nmat1260.

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Noh, Myounggyu D., and Wonjin Jeong. "Design and Unbiased Control of Nine-Pole Radial Magnetic Bearing." Actuators 12, no. 12 (2023): 458. http://dx.doi.org/10.3390/act12120458.

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Typical radial active magnetic bearings are structurally symmetric. For example, an eight-pole bearing uses two opposing pairs to control one axis by winding the pair in series. The magnetic force produced by an active magnetic bearing is quadratically proportional to coil currents and inversely proportional to the square of the gap between the bearing and the journal. Bias linearization is widely used to linearize the relationship of coil currents to the magnetic force. However, the bias currents increase ohmic losses and require a larger than necessary capacity of power amplifiers to supply
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Liu, Qiang, and Run Min Peng. "Application of High-Precision Magnetic Survey to the Investigation of Mineral Resources in Halaganlawusu Area, Inner Mongolia." Advanced Materials Research 1073-1076 (December 2014): 2001–4. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.2001.

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In this paper 1:10 000 high-precision magnetic survey work has been done using GSM-19T proton magnetometer in Halaganlawusu area. There were data processing including gridding, filtering, reduction to the pole, continuation, derivation, and so on. By precise interpretation and inference with magnetic anomaly, the distribution characteristics of basic rock mass was found out. According to the magnetic survey data and geological research, fitting-inversion of measured magnetic section P1, P2 were done. It preliminarily concluded the distribution characteristics of underground ore rock mass and a
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Dissertations / Theses on the topic "Magnetic pole inversion"

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Gallet, Yves. "La magnetostratigraphie : aspects fondamentaux et appliques." Paris 7, 1988. http://www.theses.fr/1988PA077056.

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Une eetude magnetostratigraphique de la limite jurassique/cretace au maroc permet de discuter les possibilites de correlation stratigraphique en l'absence d'une biostratigraphie bien etablie. Avec des donnees du forage de cony, on met en evidence des series triasiques et permiennes. Les resultats paleomagnetiques permettent de preciser la derive des poles magnetiques de l'eurasie. On modelise aussi le champ magnetique a l'interieur d'un forage
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Conference papers on the topic "Magnetic pole inversion"

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Котолова, Светлана Роландовна, Ванда Состиковна Кодоева, and Ада Георгиевна Тибилова. "MAGNETIC POLE INVERSION: A PERSPECTIVE ON THE FUTURE OF THE EARTH." In Анализ проблем и поиск перспективных научных решений: сборник статей международной научной конференции (Санкт-Петербург, Июль 2024). Crossref, 2024. http://dx.doi.org/10.58351/240706.2024.15.56.003.

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В статье рассматривается возможность инверсии магнитных полюсов Земли, что может привести к глобальным последствиям для всей планеты и человечества в целом. Причина такого явления - наличие магнитного поля Земли благодаря особому внутреннему строению и составу ядра планеты. The article considers the possibility of inversion of the Earth's magnetic poles, which can lead to global consequences for the entire planet and humanity as a whole. The reason for such a phenomenon is the presence of the Earth's magnetic field due to the special internal structure and composition of the planet's core.
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Nuamah, D. O. B., A. Kiss, and M. Dobroka. "Reduction to Pole of Non-Equidistantly Measured Magnetic Data Using an Inversion-Based Fourier Transformation Algorithm." In 2nd Conference on Geophysics for Mineral Exploration and Mining. EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201802725.

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Dobroka, M., H. Szegedi, and J. Somogyi Molnar. "A New Inversion Based 2D Fourier Transformation Method and Its Use in Pole-reduction of Magnetic Data Set." In 77th EAGE Conference and Exhibition 2015. EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201412759.

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Hursan, Gabor, Wei Shao, Ron Balliet, and Yasir Farooq. "Eliminating Diffusion Effects from NMR Logging Data for Enhanced Carbonate Pore Typing." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206233-ms.

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Abstract Transverse relaxation (T2) times measured by multi-frequency, multi-gradient nuclear magnetic resonance (NMR) logging tools are affected by diffusion-induced enhanced relaxation which reduces the sensitivity to pore size in slow-relaxing formations such as macroporous carbonates and complicates the integration with zero-gradient core NMR data. We propose a solution for eliminating the diffusion-related uncertainties using intrinsic T2 distributions, obtained by a new inversion-forward modeling-inversion (IFMI) method, for carbonate pore typing applications. The NMR logs presented in t
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Haji, Abdullah, Ahmed Fateh, and Ahmed Abouzaid. "Advanced Pore and Rock Type Characterization Using NMR T2 Gamma Inversion in Carbonate Reservoirs." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22480-ea.

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Abstract Carbonate reservoir complexity imposes some challenges in formation evaluation and characterization. Grain, pore, and throat size distributions play major roles in rock typing to understand static and dynamic behaviors of carbonate reservoirs. Special core analysis techniques, such as MICP and digital core imaging, revealed that the presence of different types of pore structures can be classified based on sizes as micro, meso and macro pores. This paper explores a unique inversion technique using nuclear magnetic resonance (NMR) data to deliver fast, accurate, and continuous pore typi
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Funk, James, Michael Myers, and Lori Hathon. "Correlated Inversion of Complex Dielectric Dispersion and NMR Measurements in Conventional Carbonates." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210006-ms.

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Abstract Combinations of dielectric and NMR measurements are frequently used to improve saturation modeling in complex situations, often incorporating the concept of wettability. Due to the two methods' distinct tools and physical mechanisms, the interplay of the electrical and magnetic fields and their constitutive equations are generally not addressed. This is directly counter to the situation with the medical imaging modalities, magnetic resonance electrical properties tomography (MREPT) and magnetic resonance electrical impedance tomography (MREIT), where field-specific polarizations and r
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Zhang, Gong, and Yingyao Qin. "Improvement of T2-PC 2D NMR Inversion Method for Characterizing Pore-Throat Connectivity." In 2023 SPWLA 64th Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2023. http://dx.doi.org/10.30632/spwla-2023-00100.

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As a nondestructive, efficient, and noninvasive detection method, nuclear magnetic resonance (NMR) technology plays an important role in petrophysics. The NMR experiments of water-saturated cores and cores in a centrifugal state can distinguish movable fluids from bound fluids and obtain bound water saturation. The bound water saturation is a key parameter that determines the development effect of low-permeability oil and gas reservoirs. The T2-Pc two-dimensional spectrum combined with relaxation time and capillary pressure can not only obtain the irreducible water saturation under different p
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Shao, Wei, Gabriela Singer, Gabor Hursan, and Shouxiang Mark Ma. "NMR Fluid Substitution for Multimodal Carbonate Rocks." In 2023 SPWLA 64th Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2023. http://dx.doi.org/10.30632/spwla-2023-0101.

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Nuclear magnetic resonance (NMR) petrophysical interpretation is largely based on the correlation between NMR relaxation time and formation pore-size distribution, assuming the reservoir is fully saturated by the wetting fluid within the logging tools’ sensitive volume. NMR fluid substitution (FS), a set of methods to eliminate the effect of nonwetting fluids from NMR data acquired in partially saturated rocks, has been developed and established for simple, mostly unimodal pore systems. This paper evaluates the effectiveness of existing FS methods in multimodal carbonate pore systems and propo
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Salazar, J. P., J. Borri, L. A. Longhi, A. A. Monlevade, and M. J. Martins. "NMR Data Processing Using Gamma Function in the Evaluation of Oil Viscosity in Reservoirs of Campos Basin, Offshore Brazil." In Offshore Technology Conference Brasil. OTC, 2023. http://dx.doi.org/10.4043/32922-ms.

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Abstract The use of Nuclear Magnetic Resonance (NMR) logs for petrophysical interpretation and evaluation in the oil and gas industry has become very important in the last decades, especially in Brazil, where the use of this technology was significantly increased in the evaluation of different formations. This is mainly because the porosity estimation provided by this technology is independent of lithology and can be associated with different pore sizes. Nevertheless, the presence of hydrocarbon inside the pore space affect the NMR response in term of time decay. This response depends of the o
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Ma, Juntao, Lin Liang, Xi Yan, et al. "Pore System Characterization of Carbonate Rocks: A Multiphysics Approach Through Acoustic and NMR Measurements." In 2023 SPWLA 64th Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2023. http://dx.doi.org/10.30632/spwla-2023-0051.

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Pore system characterization and, thus, permeability estimation in carbonate rocks have always been challenging due to the complexity of the carbonate rocks. Both acoustic and nuclear magnetic resonance (NMR) measurements have been employed individually to characterize different aspects of pore structure. In this study, we combine acoustic and NMR measurements for an improved, quantitative pore structure characterization of carbonate rocks. We first calculate the volume fractions of crack pores (microcracks and microfractures with a low aspect ratio), reference pores (interparticle pores with
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