Thematische Bibliographien / Remanent magnetic induction

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Auswahl der wissenschaftlichen Literatur zum Thema „Remanent magnetic induction“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Remanent magnetic induction"

Sternberg, Robert S. „Archaeomagnetism and magnetic anomalies in the American Southwest“. GEOPHYSICS 52, Nr. 3 (März 1987): 368–71. http://dx.doi.org/10.1190/1.1442311.

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Magnetic surveying is probably the most widely used geophysical technique at archaeological sites (Weymouth and Huggins, 1985). It is useful for locating features in which the magnetic susceptibility contrasts with the magnetic susceptibility of the surroundings because of induced and/or remanent magnetization. A contrast in magnetic induction can arise, for example, when the disturbed soil fill inside a formerly occupied room has a different magnetic susceptibility from the subsoil outside the room (Tite and Mullins, 1971). A contrast in magnetic remanence most commonly occurs when a baked clay artifact or feature such as a hearth has acquired a thermoremanent magnetization after being heated to several hundred degrees Celsius.

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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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Abreu, H., J. R. Teodósio, J. Neto, M. Silva und C. S. Da Costa Viana. „The Influence of Molybdenum on the Texture and Magnetic Anisotropy of Fe–xMo–5Ni–0.05C Alloys“. Textures and Microstructures 31, Nr. 4 (01.01.1999): 231–38. http://dx.doi.org/10.1155/tsm.31.231.

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Diagrams of remanent induction, Br, versus saturation induction, Bs, for Fe–5Ni–xMo–0.05C alloys, where x is equal to 11%, 15% or 19%, were determined for samples 60%, 80%, 90% and 97% cold rolled and magnetically age-annealed at 610°C for 1h. The texture evolution in those alloys was analysed as a function of rolling reduction, by means of the orientation distribution function (ODF). The results show that a sharp {100} 〈110〉 texture component develops in the 11%-Mo alloy for rolling reductions in excess of 90%. This leads to the highest values of the remanent induction, Br, and of the Br/Bs ratio for this alloy as a result of 〈100〉 directions, the easy magnetization directions, lying at 45° to the rolling direction.

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FECHER, GERHARD H., DANIEL EBKE, SIHAM OUARDI, STEFANO AGRESTINI, CHANG-YANG KUO, NILS HOLLMANN, ZHIWEI HU et al. „STATE OFCoANDMnIN HALF-METALLIC FERROMAGNETCo2MnSiEXPLORED BY MAGNETIC CIRCULAR DICHROISM IN HARD X-RAY PHOTOELECTRON EMISSION AND SOFT X-RAY ABSORPTION SPECTROSCOPIES“. SPIN 04, Nr. 04 (Dezember 2014): 1440017. http://dx.doi.org/10.1142/s2010324714400177.

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The half-metallic Heusler compound Co2MnSi is a very attractive material for spintronic devices because it exhibits very high tunnelling magnetoresistance ratios. This work reports on a spectroscopic investigation of thin Co2MnSi films as they are used as electrodes in magnetic tunnel junctions. The investigated films exhibit a remanent in-plane magnetization with a magnetic moment of about 5 μBwhen saturated, as expected. The low coercive field of only 4 mT indicates soft magnetic behavior. Magnetic dichroism in emission and absorption was measured at the Co and Mn 2p core levels. The photoelectron spectra were excited by circularly polarized hard X-rays with an energy of 6 keV and taken from the remanently magnetized film. The soft X-ray absorption spectra were taken in an induction field of 4 T. Both methods yielded large dichroism effects. An analysis reveals the localized character of the electrons and magnetic moments attributed to the Mn atoms, whereas the electrons related to the Co atoms contribute an itinerant part to the total magnetic moment.

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Kruželák, Ján, Martina Matvejová, Rastislav Dosoudil und Ivan Hudec. „Barium and strontium ferrite-filled composites based on NBR and SBR“. Journal of Elastomers & Plastics 51, Nr. 5 (09.08.2018): 421–39. http://dx.doi.org/10.1177/0095244318792036.

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In the first part of the research, rubber magnetic composites were prepared by incorporation of strontium and barium ferrite in concentration scale ranging from 0 to 200 phr into rubber matrices based on acrylonitrile–butadiene rubber and styrene–butadiene rubber. The main objective was to investigate the influence of the type and content of magnetic filler on the cross-link density, physical–mechanical and magnetic characteristics of the prepared composites. In the second part of the study, the content of magnetic fillers was kept on constant level—200 phr and the main aim was to investigate the change in mutual combination of both fillers on the cross-linking and properties of the rubber magnets. The results revealed that both fillers show reinforcement effect in the rubber matrices. The higher tensile strength of composites was achieved by application of barium ferrite. Magnetic properties of composite materials were significantly influenced by magnetic characteristics of magnetic fillers. Higher remanent magnetic induction of barium ferrite was reflected in higher remanent magnetization of the equivalent composites. On the other hand, higher coercivity of strontium ferrite resulted in higher coercivity of strontium ferrite-filled composites.

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Huang, E.-Wen, Guo-Yu Hung, Soo Yeol Lee, Jayant Jain, Kuan-Pang Chang, Jing Jhe Chou, Wen-Chi Yang und Peter K. Liaw. „Mechanical and Magnetic Properties of the High-Entropy Alloys for Combinatorial Approaches“. Crystals 10, Nr. 3 (14.03.2020): 200. http://dx.doi.org/10.3390/cryst10030200.

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This review summarizes the state of high-entropy alloys and their combinatorial approaches, mainly considering their magnetic applications. Several earlier studies on high-entropy alloy properties, such as magnetic, wear, and corrosion behavior; different forms, such as thin films, nanowires, thermal spray coatings; specific treatments, such as plasma spraying and inclusion effects; and unique applications, such as welding, are summarized. High-entropy alloy systems that were reported for both their mechanical and magnetic properties are compared through the combination of their Young’s modulus, yield strength, remanent induction, and coercive force. Several potential applications requiring both mechanical and magnetic properties are reported.

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Dabas, Michel, und John R. Skinner. „Time‐domain magnetization of soils (VRM), experimental relationship to quadrature susceptibility“. GEOPHYSICS 58, Nr. 3 (März 1993): 326–33. http://dx.doi.org/10.1190/1.1443416.

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A comparison is made between measurements with a multichannel bipolar pulsed‐induction meter (PIM) and measurements made with a phase‐sensitive susceptibility bridge on more than 211 soil samples from a variety of archaeological sites in Europe. Eddy currents originating from the decay of viscous remanent magnetization (VRM) were measured with the PIM. The in‐phase and out‐of‐phase [Formula: see text] magnetic mass susceptibilies were measured with the susceptibility bridge. Viscous remanent magnetization was measured through eight time sampling intervals on the pulsed‐induction meter, and the linearity of VRM for selected samples was tested at various field strengths (200 to 2300 μT). It is believed that this extension of the reversible range indicates a high coercive strength of the magnetic grains in the soil samples involved. Whatever the origin of the soil sample, a constant decay of VRM with time was observed between 56 and 417 μs, after switching off the inducing field. This relation is shown to be a power law with exponent −1.4. This roughly agrees with a theoretical model that takes into account a finite‐energizing time of the transmitter pulse and single‐domain (SD) behavior of particles. Finally, a comparison is made between VRM and quadrature susceptibility [Formula: see text]. This comparison is in accordance with well dispersed single‐domain theory, and was found to be a linear relationship.

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Kruželák, Ján, Richard Sýkora, Rastislav Dosoudil und Ivan Hudec. „Rubber Composites Based on Polar Elastomers with Incorporated Modified and Unmodified Magnetic Filler“. Advances in Materials Science and Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/7242891.

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Rubber magnetic composites were prepared by incorporation of unmodified and surface modified strontium ferrite into rubber matrices based on NBR and NBR/PVC. Strontium ferrite was dosed to the rubber matrices in concentration scale ranging from 0 to 100 phr. The main goal was to investigate the influence of the type of ferrite on the curing process, physical-mechanical and magnetic properties of composites. The mutual interactions between the filler and rubber matrices were investigated by determination of cross-link density and SEM analysis. The incorporation of magnetic fillers leads to the increase of cross-link density and remanent magnetic induction of composites. Moreover, the improvement of physical-mechanical properties was achieved in dependence on the content of magnetic fillers. Surface modification of ferrite contributed to the enhancement of adhesion on the interphase filler-rubber. It can be stated that ferrite exhibits reinforcing effect in the composite materials and this reinforcing behavior was emphasized with the increase in polarity of the rubber matrix.

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Gao, Li, Qiu Hong Song und Jun Ting Yuan. „Effect of Continuous Annealing Parameters on the Microstructure and Magnetic Property of Cold Rolled Dual Phase Steel“. Advanced Materials Research 476-478 (Februar 2012): 241–47. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.241.

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The effect of continuous annealing parameters on the microstructure and magnetic property of cold rolled dual phase steel (DP steel) are investigated. Correlations of microstructure, magnetic properties and continuous annealing parameters are revealed. The mechanism of the magnetic property varying with continuous annealing process is also discussed. The results show that recrystallization is almost completed when heating to 740°C. For the DP steel soaked in the range of 770°C-830°C and quenched in different temperature, the TEM results indicate its microstructure mainly consists of the ferrite and martensite phase. The martensite volume fraction increases gradually with increasing the soaking and quenching temperature. It is found that magnetic properties of dual phase steel are very sensitive to continuous annealing process. With rising soaking and quenching temperature, the coercivity and hysteresis loss increase obviously, whereas the maximum permeability and the remanent induction tend to decrease.

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Thongsamrit, Wannisa, Thanida Charoensuk, Panissa Saetang, Pongsakorn Jantaratana, Chesta Ruttanapun und Chitnarong Sirisathitkul. „Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites“. Applied Sciences 11, Nr. 5 (26.02.2021): 2067. http://dx.doi.org/10.3390/app11052067.

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Process parameters leading to magnetic polymer composites, an essential ingredient in the additive manufacturing of rare-earth-free magnets, are investigated. The induction melting of manganese (Mn) and aluminum (Al), and subsequent annealing at 450, 500, or 550 °C for 20 min, gave rise to ferromagnetic τ–MnAl phase, as well as other phases. The nonmagnetic Al4C3 and oxide phases were then removed by the magnetic separation. Magnetic powders from the magnetic separation were incorporated in polylactic acid (PLA) matrix via a solution route. The remanent magnetization as high as 4.3 emu/g in the powder form was reduced to 2.3–2.6 emu/g in the composites. The reduction in coercivity was minimal, and the largest value of 814 Oe was obtained when the powder annealed at 450 °C was loaded in the composite. The phase composition and hence magnetic properties were even more sensitive to the carbon (C) doping. Interestingly, the addition of 3% C led to coercivity as high as 1445 Oe in MnAl–C powders without further annealing. The enhanced coercivity was attributed to the domain wall pinning by the AlMn3C phase, and magnetizations are likely increased by this phase.

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Mehr Quellen

Dissertationen zum Thema "Remanent magnetic induction"

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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Konferenzberichte zum Thema "Remanent magnetic induction"

Dormer, Kenneth, Sunny Po, Kejian Chen, Benjamin Scherlag, Isaac Rutel, Kytai Nguyen, Satish Kyriyavar et al. „Magnetic Targeting of Therapeutics“. In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13022.

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Multiple formulations of nano-sized particles, capsules, dendrimers, lipids, ceramics and genetic materials are being investigated in multiple labs for delivery of therapeutic moieties to targeted tissues. Interest is driven by reducing health care costs while increasing therapeutic efficacy and cost of treatment. One technology, magnetic targeting, incorporates iron oxide nanoparticles, to target nanomedicine payloads, down the gradients of external magnetic fields. When iron oxide crystal domains are less than ∼20–40 nm, particles become superparamagnetic (SPION), that is exhibit no remanent induction but very high magnetic susceptibility in the presence of an external magnetic field. Thus, targeting can be vectored by magnetic lines of flux. Particles can be pulled out of the microcirculation and across membranes into tissues. Two target organs that can employ magnetic targeting are the heart (epicardium) and inner ear (cochlea).

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Cong, Peitian, Aici Qiu, Hanyu Wu, Guowei Zhang, Jianfeng Sun, Jingya Li und Zhaofeng Su. „Development of 1.2MV Induction Cavity for IVA Driver“. In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29459.

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The 1.2MV, 70ns FWHM induction cell is developed for a 3MV Induction Voltage Adder (IVA) accelerator with three series connected cavities through a high voltage, vacuum insulating transmission line (VITL) driving rod-pinch diode (RPD) for radiography. The experimentally measured maximum relative permeability of IVA used amorphous material under pulse excitation is consistent with saturation wave model with flux density changing rate dB/dt greater than 10T/μs up to 32 T/μs. The remanence ratio Br/Bs is experimentally measured for IVA pre-annealed amorphous cores. Upon experimental results, cores in each cell are designed and determined according to current transfer efficiency and volt-second integral necessary for each induction cavity, and peak field preventing VITL bore negative surface from electron emission. The field analysis is carried out for designing VITL vacuum stack and oil cavity that contains cores and azimuthal transmission line with operation field stress being about 50% critical breakdown field. The prototype cell tests validate electric field safety and magnetic core performance. With magnetization inductance and resistance of eddy current calculated for inductive cell, the IVA accelerator circuit model is set up, and simulation predictions approximately according with experimental results are presented.

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