Thematische Bibliographien / Remanentní magnetická indukce

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Auswahl der wissenschaftlichen Literatur zum Thema „Remanentní magnetická indukce“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 18. Februar 2022

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Zeitschriftenartikel zum Thema "Remanentní magnetická indukce"

Li, Yaoguo, Jiajia Sun, Shu-Ling Li und Marcelo Leão-Santos. „A paradigm shift in magnetic data interpretation: Increased value through magnetization inversions“. Leading Edge 40, Nr. 2 (Februar 2021): 89–98. http://dx.doi.org/10.1190/tle40020089.1.

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Magnetic data are sensitive to both the induced magnetization in rock units caused by the present earth's magnetic field and the remanent magnetization acquired by rock units in past geologic time. Susceptibility is a direct indicator of the magnetic mineral content, whereas remanent magnetization carries information about the formation process and subsequent structural movement of geologic units. The ability to recover and use total magnetization, defined as the vectorial sum of the induced and remanent magnetization, therefore enables us to take full advantage of magnetic data. The exploration geophysics community has achieved significant advances in inverting magnetic data affected by remanent magnetization. It is now feasible to invert any magnetic data set for total magnetization. We provide an overview of the state of the art in magnetization inversion and demonstrate the informational value of inverted magnetization through a set of case studies from mineral exploration problems. We focus on the methods that recover either the magnitude of the total magnetization or the total magnetization vector itself.

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Evans, D. M., A. Schilling, Ashok Kumar, D. Sanchez, N. Ortega, R. S. Katiyar, J. F. Scott und J. M. Gregg. „Switching ferroelectric domain configurations using both electric and magnetic fields in Pb(Zr,Ti)O 3 –Pb(Fe,Ta)O 3 single-crystal lamellae“. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, Nr. 2009 (28.02.2014): 20120450. http://dx.doi.org/10.1098/rsta.2012.0450.

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Thin single-crystal lamellae cut from Pb(Zr,Ti)O 3 –Pb(Fe,Ta)O 3 ceramic samples have been integrated into simple coplanar capacitor devices. The influence of applied electric and magnetic fields on ferroelectric domain configurations has been mapped, using piezoresponse force microscopy. The extent to which magnetic fields alter the ferroelectric domains was found to be strongly history dependent: after switching had been induced by applying electric fields, the susceptibility of the domains to change under a magnetic field (the effective magnetoelectric coupling parameter) was large. Such large, magnetic field-induced changes resulted in a remanent domain state very similar to the remanent state induced by an electric field. Subsequent magnetic field reversal induced more modest ferroelectric switching.

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Roest, Walter R., und Mark Pilkington. „Identifying remanent magnetization effects in magnetic data“. GEOPHYSICS 58, Nr. 5 (Mai 1993): 653–59. http://dx.doi.org/10.1190/1.1443449.

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Remanent magnetization can have a significant influence on the shape of magnetic anomalies in areas that are generally characterized by induced magnetization. Since modeling of magnetic anomalies is nonunique, additional constraints on the direction of magnetization are useful. A method is proposed here to study the possible contribution of remanent magnetization to a particular anomaly, by comparing two functions that are calculated directly from the observations: (1) the amplitude of the analytic signal, and (2) the horizontal gradient of pseudogravity. From the amplitude and relative position of maxima in these derived quantities, we infer the deviation of the magnetization direction from that of the ambient field. The approach is applied to the magnetic anomaly in the center of the Manicouagan impact structure (Canada). Our results, based only on the magnetic anomaly observations, are in close agreement with constraints on the direction of remanent magnetization from rock samples.

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Noh, Kyubo, Ki Ha Lee, Seokmin Oh, Soon Jee Seol und Joongmoo Byun. „Numerical evaluation of active source magnetics as a method for imaging high-resolution near-surface magnetic heterogeneity“. GEOPHYSICS 82, Nr. 5 (01.09.2017): J27—J38. http://dx.doi.org/10.1190/geo2016-0435.1.

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We have evaluated a geophysical method that uses a low-frequency magnetic source to image subsurface magnetic heterogeneity. This active source approach can be used to image magnetic features at higher resolutions than the conventional passive geomagnetic method. Importantly, this frequency-domain active source approach is independent of the effects of remanent magnetization, which complicates the interpretation of geomagnetic data. We carried out forward modeling of frequency-domain electromagnetic (EM) data and we found that, at frequencies of a few hertz, the magnetostatic response due to the induced magnetization dominates the EM induction response. The result suggests that it is possible to make magnetic interpretation of low-frequency EM data without having to consider the conductivity structure and the corresponding EM induction effect. We compare the anomalous magnetic responses with magnetic noise components and find that the proposed active source magnetic (ASM) method has a depth of investigation of approximately 300 m. Free-space field and inductive noise are considered as the most important issues affecting the depth of investigation. We also determine the potential for linear interpretation of magnetic heterogeneity under 0.1 SI by showing that the low-frequency magnetic response can be approximated by a linear magnetic response. In our synthetic experiments, inversion of the ASM data shows a marked enhancement in resolution, with no effect of the remanent magnetization, in contrast to geomagnetic inversion. These results show that the ASM method is a useful geophysical tool, especially when high-resolution imaging of magnetic susceptibility is required or where strong remanent magnetization complicates the magnetic interpretation.

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Liu, Shuang, Maurizio Fedi, Xiangyun Hu, Jamaledin Baniamerian, Bangshun Wei, Dalian Zhang und Rixiang Zhu. „Extracting Induced and Remanent Magnetizations From Magnetic Data Modeling“. Journal of Geophysical Research: Solid Earth 123, Nr. 11 (November 2018): 9290–309. http://dx.doi.org/10.1029/2017jb015364.

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Elllis, Robert G., Barrry de Wet und Ian N. Macleod. „Inversion of Magnetic Data from Remanent and Induced Sources“. ASEG Extended Abstracts 2012, Nr. 1 (Dezember 2012): 1–4. http://dx.doi.org/10.1071/aseg2012ab117.

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Yang, Tao, Jintian Gao, Zuowen Gu, Baatarkhuu Dagva und Batsaikhan Tserenpil. „Petrophysical Properties (Density and Magnetization) of Rocks from the Suhbaatar-Ulaanbaatar-Dalandzadgad Geophysical Profile in Mongolia and Their Implications“. Scientific World Journal 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/791918.

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Petrophysical properties of 585 rock samples from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia are presented. Based on the rock classifications and tectonic units, petrophysical parameters (bulk density, magnetic susceptibility, intensity of natural remanent magnetization, and Köenigsberger ratio) of these rocks are summarized. Results indicate that (1) significant density contrast of different rocks would result in variable gravity anomalies along the profile; (2) magnetic susceptibility and natural remanent magnetization of all rocks are variable, covering 5-6 orders of magnitude, which would make a variable induced magnetization and further links to complex magnetic anomalies in ground surface; (3) the distribution of rocks with different lithologies controls the pattern of lithospheric magnetic anomaly along the profile. The petrophysical database thus provides not only one of the keys to understand the geological history and structure of the profile, but also essential information for analysis and interpretation of the geophysical (e.g., magnetic and gravity) survey data.

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Beard, L. P., J. Norton und J. R. Sheehan. „Lightning-Induced Remanent Magnetic Anomalies in Low-Altitude Aeromagnetic Data“. Journal of Environmental & Engineering Geophysics 14, Nr. 4 (01.12.2009): 155–61. http://dx.doi.org/10.2113/jeeg14.4.155.

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Baniamerian, Jamaledin, Shuang Liu, Xiangyun Hu, Maurizio Fedi, Mahak Singh Chauhan und Mahmoud Ahmed Abbas. „Separation of magnetic anomalies into induced and remanent magnetization contributions“. Geophysical Prospecting 68, Nr. 7 (14.07.2020): 2320–42. http://dx.doi.org/10.1111/1365-2478.12993.

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Nyberg, Johan, Antoon Kuijpers, Björn A. Malmgren und Helmar Kunzendorf. „Late Holocene Changes in Precipitation and Hydrography Recorded in Marine Sediments from the Northeastern Caribbean Sea“. Quaternary Research 56, Nr. 1 (Juli 2001): 87–102. http://dx.doi.org/10.1006/qres.2001.2249.

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AbstractWe present a record of climate variability spanning the last 2000 years obtained from sediment cores retrieved south and west of Puerto Rico in the northeastern Caribbean Sea. The records include lithological and mineral magnetic parameters as well as planktonic foraminifer data. For chronostratigraphic control, AMS 14C and 210Pb/137Cs measurements were made. Harmonic analysis of the values of the mineral magnetic parameters “saturation isothermal remanent magnetization” (SIRM), “anhysteric remanent magnetization divided by magnetic susceptibility” (ARM/χ), and “saturation isothermal remanent magnetization divided by magnetic susceptibility” (SIRM/χ) indicate the existence of a ∼200-year-long climate cycle in the northeastern Caribbean during the last 2000 years. The detected cycle may reflect changes in precipitation patterns over the low-latitude North Atlantic Ocean and surrounding continental areas. Higher organic carbon contents appear in the sediments both off southern and western Puerto Rico before and at the onset of the Little Ice Age around A.D. 1300 to 1500. This is indicative of increased run off and/or enhanced surface productivity possibly associated with more intense wind-induced upwelling. Major changes in the geochemical and mineral magnetic records around A.D. 850–1000 concur with changes in other records from the Caribbean and North African regions indicating a shift toward a more humid climate over the low-latitude North Atlantic.

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Dissertationen zum Thema "Remanentní magnetická indukce"

Horký, Jakub. „Remanentní magnetismus elektromagnetů stejnosměrných stykačů“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442794.

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The master thesis is focused on a remanent magnetism of electromagnets of DC contactors. In the first part of the thesis deals with the formation of a magnetic field in different kinds of materials, description of their magnetization and sorting. The next part is focused on the principle and history of an electromagnet. Negative effects and remanent induction of the contactor are described in the end of the theoretical part. The second part is a practical part. First, the reaction times were measured on a pair of DC contactors. Using the obtained data, an electronic circuit was designed to minimize the difference in switching times of the given DC contactors.

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Buchteile zum Thema "Remanentní magnetická indukce"

Roshko, R. M., P. D. Mitchler und E. Dan Dahlberg. „The Effect of Thermally Induced Relaxation on the Remanent Magnetization in a Moving Preisach Model“. In Magnetic Hysteresis in Novel Magnetic Materials, 147–57. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_13.

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Solheid, P. A., und T. Yamazaki. „Data report: Evidence of the dissolution of fine-grained magnetic minerals from measurements of natural and laboratory-induced remanent magnetizations at Site 1077“. In Proceedings of the Ocean Drilling Program. Ocean Drilling Program, 2001. http://dx.doi.org/10.2973/odp.proc.sr.175.215.2001.

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Konferenzberichte zum Thema "Remanentní magnetická indukce"

Espina-Herna´ndez, J. H., F. Caleyo, J. M. Hallen, A. Lo´pez-Montenegro und E. Pe´rez-Baruch. „Influence of Remanent Magnetization on Pitting Corrosion in Pipeline Steel“. In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31389.

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These days, in-line inspections based on the magnetic flux leakage (MFL) principle are routinely used to detect and size metal loss and mechanical anomalies in operating oil and gas pipelines. One of the characteristics of the MFL technology is that after the inspection, the pipeline wall shows a remanent magnetization. In this work, the influence of the magnetic field on pitting corrosion in pipeline steel is studied. Pitting corrosion experiments have been carried out on samples of an API 5L grade 52 steel under a magnetization level of the same order of magnitude of the remanent magnetization in the pipeline wall after the MFL inspection. The samples were magnetized using rings of the investigated steel. The closed magnetic circuit configuration used in this study survey guaranteed that the samples kept the same magnetization level during the complete duration of the conducted experiments. This experimental setup was used in order to reproduce the conditions observed in MFL-inspected pipelines in which the magnetic field was confined to the pipe wall thickness. Immediately after magnetization, the investigated samples were subjected to pitting by immersing them in a solution with dissolved Cl− and SO42− ions. The pitting experiments were conducted for exposure times of 7 days. Non-magnetized specimens were used as control samples. The depths of the pits induced in the investigated samples were measured using optical microscopy. The maximum pit depth of each sample was recorded and used to conduct extreme value analysis of the pitting process in the magnetized and non-magnetized specimens. The results of this investigation indicate that the magnetic field confined within the pipeline wall has a significant influence on the pitting corrosion process. The statistical assessment of the pitting corrosion data collected during this study shows that the magnetic field reduces the average depth of the pit population. It also reduces the extreme pit depth values that can be predicted from the maximum values observed in the magnetized samples, with respect to the non-magnetized control samples. Scanning electron microscopy observations show that the magnetic field alters the pit morphology by increasing the pit opening (mouth). It is shown that the observed reduction in the pit depth when a magnetic field is confined to the volume of the corroding material can be explained based on the behavior of the paramagnetic corrosion products under the influence of the local magnetic field gradients produced inside and within the immediate vicinity of stable pits.

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Jackson, Joshua E., Angelique N. Lasseigne-Jackson, Francisco J. Sanchez, David L. Olson und Brajendra Mishra. „The Influence of Magnetization on Corrosion in Pipeline Steels“. In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10615.

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Laboratory measurements have shown a strong increase on the hydrogen content in steel after electrochemical hydrogen charging with a two Tesla applied magnetic field and a serious increase in hydrogen-induced cracking and pitting. Cold work combining with the effect of applied magnetic field creates a material more crack sensitive to increased hydrogen content. A derivation based on the use of the Helmholtz Free Energy is applied to examine the thermodynamic effect of magnetization on hydrogen content. The effect of magnetization on the electronic spin configurations, magnetostriction (directional strain induced in steel from an applied magnetic field), and interstitial solute-induced strain are considered. A possible kinetic model for enhanced hydrogen ion pickup and corrosion based on surface effects associated with the Gouy-Chapman Layer and the Helmholtz Double Layer is examined. Disturbance of these layers acts to enhance hydrogen transport to the surface. The high applied and remanent magnetic fields and large cathodic protection currents returning in the pipe simultaneously may disturb these surface layers, resulting in enhancement of both cathodic and anodic reactions.

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Souza, Jeferson de, Saulo P. Oliveira und Francisco J. F. Ferreira. „Using cosine and sine transforms for interpreting magnetic anomalies from dikes having arbitrary dip angles, induced and remanent magnetization“. In SEG Technical Program Expanded Abstracts 2019. Society of Exploration Geophysicists, 2019. http://dx.doi.org/10.1190/segam2019-3215371.1.

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Jackson, Joshua E., Angelique N. Lasseigne-Jackson, David L. Olson, Brajendra Mishra, Meredith S. Heilig und Jenny K. Collins. „The Effect of Magnetic Fields on Corrosion in Pipeline Steel“. In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29560.

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Measurements performed in earlier research have indicated a strong effect of magnetization on hydrogen content (thermodynamics) as well as cracking, and pitting (kinetics) in pipeline steels as described in Sanchez (2005) and Sanchez et al. (2005). The effect of cold work, further increasing hydrogen content, cracking, and pitting, was also assessed. Theoretical descriptions of both thermodynamic and kinetic interpretations of the observed effect is described and correlated to observed results. There are two ways that electromagnetic current influences corrosion: (1) D/C currents (under applied or Remanent magnetic fields) and A/C electric currents (which create electromagnetic fields through Lenz’s Law) may influence magnetocorrosion as described in this paper, and (2) A/C currents also have the potential to strip the protective passive layer from materials and greatly accelerate corrosion. Electrochemical charging is currently being performed at varied magnetic field strengths to assess the nature of the observed influence of magnetization on both hydrogen content (thermodynamic) and cracking/pitting (kinetic), including the role of controlled-roll cold working. Naval and maritime use of A/C and D/C electric-powered systems including propulsion drives, servos, and controls, is increasing rapidly in sea-going operation and potential for stray currents is an increasing risk. Magnetic flux leakage inspection, using saturating magnetic fields, is widely used for reliable and accurate inspection of pipeline corrosion and wall thickness. Previous laboratory research shows a significant increase in both pipeline steel hydrogen content in steel and pitting and cracking after electrochemical hydrogen charging under an applied two Tesla magnetic field. Cold work was observed to further increase the observed effects. The thermodynamic auxiliary functions, using a derivation of Helmholtz free energy, are examined to assess the thermodynamic effects of magnetization on hydrogen content. The effect of magnetization on the thermodynamics of electron spin configurations, interstitial solute-induced strain, magnetostriction (directional strain induced in steel from an applied magnetic field) are considered. Kinetic interpretations of possible interactions with the Helmholtz Double (capacitor-like) Layer and the Gouy-Chapman (diffuse) layer that may lead to increased diffusion and thus to hydrogen supersaturation are described. Electrochemical impedance measurements are being performed to assess the influence of applied magnetic fields on the Helmholtz and Gouy-Chapman layers.

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