Relevant bibliographies by topics / Magnetic flux

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Magnetic flux'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Magnetic flux"

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OKADA, Yohji, Hidetoshi MIYAZAWA, Ryou KONDO, and Masato ENOKIZONO. "2A21 Flux Concentrated Hybrid Magnetic Bearing." Proceedings of the Symposium on the Motion and Vibration Control 2010 (2010): _2A21–1_—_2A21–12_. http://dx.doi.org/10.1299/jsmemovic.2010._2a21-1_.

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Grebenikov, V. V., R. V. Gamaleya, and A. N. Sokolovsky. "ELECTRIC MACHINE WITH AXIAL MAGNETIC FLUX, PERMANENT MAGNETS AND MULTILAYERED PRINTING WINDINGS." Tekhnichna Elektrodynamika 2020, no. 2 (February 26, 2020): 28–35. http://dx.doi.org/10.15407/techned2020.02.028.

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Schmieder, Brigitte, and Etienne Pariat. "Magnetic flux emergence." Scholarpedia 2, no. 12 (2007): 4335. http://dx.doi.org/10.4249/scholarpedia.4335.

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Thomas, John H., and Benjamin Montesinos. "Magnetic Flux Concentration by Siphon Flows in Isolated Magnetic Flux Tubes." Symposium - International Astronomical Union 138 (1990): 263–66. http://dx.doi.org/10.1017/s0074180900044211.

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Siphon flows along arched, isolated magnetic flux tubes, connecting photospheric footpoints of opposite magnetic polarity, cause a significant increase in the magnetic field strength of the flux tube due to the decreased internal gas pressure associated with the flow (the Bernoulli effect). These siphon flows offer a possible mechanism for producing intense, inclined, small-scale magnetic structures in the solar photosphere.
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Harada, Y., W. Hioe, and E. Goto. "Quantum flux parametron with magnetic flux regulator." IEEE Transactions on Appiled Superconductivity 1, no. 2 (June 1991): 90–94. http://dx.doi.org/10.1109/77.84614.

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Liu, Jiang, V. Angelopoulos, Xu-Zhi Zhou, and A. Runov. "Magnetic flux transport by dipolarizing flux bundles." Journal of Geophysical Research: Space Physics 119, no. 2 (February 2014): 909–26. http://dx.doi.org/10.1002/2013ja019395.

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Jiu, Shu-Ping. "Numerical Simulation of the Explosive Events in the Solar Atmosphere." International Astronomical Union Colloquium 141 (1993): 134–37. http://dx.doi.org/10.1017/s0252921100028955.

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AbstractExplosive events are the earliest indicators of flare activity and potentially predict the imminent occurrence of a flare at a specific location. They are highly energetic small-scale phenomena which are frequently detected throughout the quiet and active sun. The observations show that explosive events are related to emerging magnetic flux and tend to occur on the edges of high photospheric magnentic field regions. The cancellation of photospheric magnetic flux are the manifestation of explosive events, so that they are identified as the magnetic reconnection of flux elements. We assume that emerging flux are convected to the network boundaries with the typical velocity of intranetwork elements. Two-dimension (2D) compressible MHD simulations are performed to explore the reconnection process between emerging intranework flux and network field. The numerical results clearly show the cancellation of magnetic flux and the acceleration of the plasma flow.
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Neuber, A. A., and J. C. Dickens. "Magnetic flux compression Generators." Proceedings of the IEEE 92, no. 7 (July 2004): 1205–15. http://dx.doi.org/10.1109/jproc.2004.829001.

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Dahlburg, R. B., S. K. Antiochos, and D. Norton. "Magnetic flux tube tunneling." Physical Review E 56, no. 2 (August 1, 1997): 2094–103. http://dx.doi.org/10.1103/physreve.56.2094.

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Xia, Chun, and Rony Keppens. "Modeling Magnetic Flux Ropes." Proceedings of the International Astronomical Union 8, S300 (June 2013): 121–24. http://dx.doi.org/10.1017/s1743921313010843.

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AbstractThe magnetic configuration hosting prominences can be a large-scale helical magnetic flux rope. As a necessary step towards future prominence formation studies, we report on a stepwise approach to study flux rope formation. We start with summarizing our recent three-dimensional (3D) isothermal magnetohydrodynamic (MHD) simulation where a flux rope is formed, including gas pressure and gravity. This starts from a static corona with a linear force-free bipolar magnetic field, altered by lower boundary vortex flows around the main polarities and converging flows towards the polarity inversion. The latter flows induce magnetic reconnection and this forms successive new helical loops so that a complete flux rope grows and ascends. After stopping the driving flows, the system relaxes to a stable helical magnetic flux rope configuration embedded in an overlying arcade. Starting from this relaxed isothermal endstate, we next perform a thermodynamic MHD simulation with a chromospheric layer inserted at the bottom. As a result of a properly parametrized coronal heating, and due to radiative cooling and anisotropic thermal conduction, the system further relaxes to an equilibrium where the flux rope and the arcade develop a fully realistic thermal structure. This paves the way to future simulations for 3D prominence formation.
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Dissertations / Theses on the topic "Magnetic flux"

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MacTaggart, David. "Theoretical magnetic flux emergence." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1692.

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Magnetic flux emergence is the subject of how magnetic fields from the solar interior can rise and expand into the atmosphere to produce active regions. It is the link that joins dynamics in the convection zone with dynamics in the atmosphere. In this thesis, we study many aspects of magnetic flux emergence through mathematical modelling and computer simulations. Our primary aim is to understand the key physical processes that lie behind emergence. The first chapter introduces flux emergence and the theoretical framework, magnetohydrodynamics (MHD), that describes it. In the second chapter, we discuss the numerical techniques used to solve the highly non-linear problems that arise from flux emergence. The third chapter summarizes the current literature. In the fourth chapter, we consider how changing the geometry and parameter values of the initial magnetic field can affect the dynamic evolution of the emerging magnetic field. For an initial toroidal magnetic field, it is found that its axis can emerge to the corona if the tube’s initial field strength is large enough. The fifth chapter describes how flux emergence models can produce large-scale solar eruptions. A 2.5D model of the breakout model, using only dynamic flux emergence, fails to produce any large scale eruptions. A 3D model of toroidal emergence with an overlying magnetic field does, however, produce multiple large-scale eruptions and the form of these is related to the breakout model. The sixth chapter is concerned with signatures of flux emergence and how to identify emerging twisted magnetic structures correctly. Here, a flux emergence model produces signatures found in observations. The signatures from the model, however, have different underlying physical mechanisms to the original interpretations of the observations. The thesis concludes with some final thoughts on current trends in theoretical magnetic flux emergence and possible future directions.
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Edwards, John. "Magnetic flux based transformer model /." [St. Lucia, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16945.pdf.

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Cook, Graeme Robert. "Magnetic flux transport simulations : applications to solar and stellar magnetic fields." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2072.

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Magnetic fields play a key role in a wide variety of phenomena found on the Sun. One such phenomena is the Coronal Mass Ejection (CME) where a large amount of material is ejected from the Sun. CME’s may directly affect the earth, therefore understanding their origin is of key importance for space weather and the near-Earth environment. In this thesis, the nature and evolution of solar magnetic fields is considered through a combination of Magnetic Flux Transport Simulations and Potential Field Source Surface Models. The Magnetic Flux Transport Simulations produce a realistic description of the evolution and distribution of the radial magnetic field at the level of the solar photosphere. This is then applied as a lower boundary condition for the Potential Field Source Surface Models which prescribe a coronal magnetic field. Using these two techniques, the location and variation of coronal null points, a key element in the Magnetic Breakout Model of CMEs, are determined. Results show that the number of coronal null points follow a cyclic variation in phase with the solar cycle. In addition, they preferentially form at lower latitudes as a result of the complex active latitude field. Although a significant number of coronal nulls may exist at any one time (≈ 17), it is shown that only half may satisfy the necessary condition for breakout. From this it is concluded that while the Magnetic Breakout Model of CMEs is an important model in understanding the origin of the CMEs, other processes must occur in order to explain the observed number of CMEs. Finally, the Magnetic Flux Transport Simulations are applied to stellar magnetic fields and in particular to the fast rotating star HD171488. From this speculative study it is shown that the Magnetic Flux Transport Simulations constructed for the Sun may be applied in very different stellar circumstances and that for HD171488 a significantly higher rate of meridional flow (1200-1400 ms⁻¹) is required to match observed magnetic field distributions.
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Murray, Michelle Joanne. "Solar flux emergence : a three-dimensional numerical study /." St Andrews, 2008. http://hdl.handle.net/10023/441.

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Cheung, Chung Ming Mark. "Magnetic flux emergence in the solar photosphere." Katlenburg-Lindau Copernicus GmbH, 2006. http://d-nb.info/981843441/34.

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Kenney, Crystal R. "Magnetic Flux Sensor for Hearing and Application." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/KenneyCR2005.pdf.

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Tsui, Chi-Wa. "Magnetic flux reconstruction methods for shaped tokamaks." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12279.

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Burgoyne, John William. "Magnetic flux instabilities in high temperature superconductors." Thesis, University of Southampton, 1993. https://eprints.soton.ac.uk/361145/.

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Ersoz, Ali. "Magnetic Resonance Current Density Imaging Using One Component Of Magnetic Flux Density." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612164/index.pdf.

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Magnetic Resonance Electrical Impedance Tomography (MREIT) algorithms using current density distribution have been proposed in the literature. The current density distribution can be determined by using Magnetic Resonance Current Density Imaging (MRCDI) technique. In MRCDI technique, all three components of magnetic flux density should be measured. Hence, object should be rotated inside the magnet which is not trivial even for small size objects and remains as a strong limitation to clinical applicability of the technique. In this thesis, 2D MRCDI problem is investigated in detail and an analytical relation is found between Bz, Jx and Jy. This study makes it easy to understand the behavior of Bz due to changes in Jx and Jy. Furthermore, a novel 2D MRCDI reconstruction algorithm using one component of B is proposed. Iterative FT-MRCDI algorithm is also implemented. The algorithms are tested with simulation and experimental models. In simulations, error in the reconstructed current density changes between 0.27% - 23.00% using the proposed algorithm and 7.41% - 37.45% using the iterative FT-MRCDI algorithm for various SNR levels. The proposed algorithm is superior to the iterative FT-MRCDI algorithm in reconstruction time comparison. In experimental models, the classical MRCDI algorithm has the best reconstruction performance when the algorithms are compared by evaluating the reconstructed current density images perceptually. However, the J-substitution algorithm reconstructs the best conductivity image by using J obtained from the proposed algorithm. Finally, the iterative FT-MRCDI algorithm shows the best performance when the reconstructed current density images are verified by using divergence theorem.
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Işık, Emre. "Magnetic flux generation and transport in cool stars." [Katlenburg-Lindau] Copernicus Publ, 2008. http://d-nb.info/988508087/04.

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Books on the topic "Magnetic flux"

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Ryutova, Margarita. Physics of Magnetic Flux Tubes. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96361-7.

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Russell, C. T., E. R. Priest, and L. C. Lee, eds. Physics of Magnetic Flux Ropes. Washington, D. C.: American Geophysical Union, 1990. http://dx.doi.org/10.1029/gm058.

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Ryutova, Margarita. Physics of Magnetic Flux Tubes. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45243-1.

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Huebener, Rudolf Peter. Magnetic Flux Structures in Superconductors. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-08446-5.

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T, Russell C., Priest E. R. 1943-, Lee L. C. 1947-, American Geophysical Union, and American Geophysical Union Chapman Conference on the Physics of Magnetic Flux Ropes (1989 : Hamilton, Bermuda), eds. Physics of magnetic flux ropes. Washington, D.C: American Geophysical Union, 1990.

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D’haeseleer, William Denis, William Nicholas Guy Hitchon, James D. Callen, and J. Leon Shohet. Flux Coordinates and Magnetic Field Structure. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-75595-8.

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Thomas, John H. Siphon flows in isolated magnetic flux tubes. [Washington, D.C.?: National Aeronautics and Space Administration, 1989.

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Huebener, Rudolf Peter. Magnetic Flux Structures in Superconductors: Extended Reprint of a Classic Text. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001.

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P, Banerjee, and Bhabha Atomic Research Centre, eds. Design and testing of double ended explosively driven helical flux compression generator. Mumbai: Bhabha Atomic Research Centre, 2009.

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Musielak, Z. E. Generation of flux tube waves in stellar convection zones. [Washington, DC: National Aeronautics and Space Administration, 1988.

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Book chapters on the topic "Magnetic flux"

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Gooch, Jan W. "Magnetic Flux." In Encyclopedic Dictionary of Polymers, 442. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7132.

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Weik, Martin H. "magnetic flux." In Computer Science and Communications Dictionary, 957. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_10877.

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Bolton, William. "Magnetic flux." In Engineering Science, 254–80. Seventh edition. | Abingdon, Oxon; New York, NY: Routledge, 2021.: Routledge, 2020. http://dx.doi.org/10.1201/9781003093596-14.

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Burke, Harry E. "Flux Quantization." In Handbook of Magnetic Phenomena, 395–96. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-7006-2_25.

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Aidelsburger, Monika. "Staggered Magnetic Flux." In Springer Theses, 67–100. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25829-4_5.

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Weik, Martin H. "magnetic flux density." In Computer Science and Communications Dictionary, 958. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_10878.

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Lucas, Robert. "Magnetic Flux Linkage." In High School and Undergraduate Physics Practicals, 197–205. New York: CRC Press, 2022. http://dx.doi.org/10.1201/9781003262350-35.

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Matsushita, Teruo. "Longitudinal Magnetic Field Effect." In Flux Pinning in Superconductors, 139–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-45312-0_4.

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Matsushita, Teruo. "Longitudinal Magnetic Field Effect." In Flux Pinning in Superconductors, 155–204. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94639-5_5.

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Compton, A. J. "Magnetic Flux and Circuits." In Basic Electromagnetism and its Applications, 70–76. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-7890-7_6.

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Conference papers on the topic "Magnetic flux"

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Overstreet, Ross W., George T. Flowers, and Gyorgy Szasz. "Design and Testing of a Permanent Magnet Biased Active Magnetic Bearing." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8282.

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Abstract Magnetic bearings provide rotor support without direct contact. There is a great deal of current interest in using magnetic bearings for active vibration control. Conventional designs use electrical current to provide the bias flux, which is an integral feature of most magnetic bearing control strategies. Permanent magnet biased systems are a relatively recent innovation in the field of magnetic bearings. The bias flux is supplied by permanent magnets (rather than electrically) allowing for significant decreases in resistance related energy losses. The use of permanent magnet biasing in homopolar designs results in a complex flux flow path, unlike conventional radial designs which are much simpler in this regard. In the current work, a design is developed for a homopolar permanent magnet biased magnetic bearing system. Specific features of the design and results from experimental testing are presented and discussed. Of particular interest is the issue of reduction of flux leakage and more efficient use of the permanent magnets.
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Hurtig, Tomas, Nils Brenning, and Herbert Gunell. "Relativistic magnetic flux amplification." In 2013 IEEE 40th International Conference on Plasma Sciences (ICOPS). IEEE, 2013. http://dx.doi.org/10.1109/plasma.2013.6635044.

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Hurtig, T., Nils Brenning, and Herbert Gunell. "Relativistic magnetic flux amplification." In 2013 IEEE Pulsed Power and Plasma Science Conference (PPPS 2013). IEEE, 2013. http://dx.doi.org/10.1109/ppc.2013.6627640.

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Modaresahmadi, Sina, Javad Khalesi, Joshua Kadel, and Wesley Williams. "Thermal Analysis of a Subscale Flux Focusing Magnetic Gearbox." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86876.

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Magnetic gears are non-contact means of torque transmission which utilize the interaction of magnetic fields in place of the meshing teeth of mechanical gears to achieve a change in rotational speed and scale up/down the torque. A subscale magnetic gearbox featured a radial flux focusing arrangement consisting of three main rotors in the active region called inner, cage and outer rotors. In this arrangement, ferromagnetic cage rotor poles modulate flux between the inner rotor and outer rotor permanent magnets to achieve the gear reduction. Replacing the solid metal bars with laminated stacks for the cage modulating pieces as well as retaining pieces of the inner and outer rotor magnets reduces eddy current losses in the axial direction, a main source of losses in magnetic gears, while preserving the magnetic flux directed in the radial direction. Both of these features are key for overall system performance. Given the potential of demagnetization of the permanent magnets and damage to the components at high temperature, multiphysics thermal analysis is conducted on a subscale flux focusing magnetic gearbox to predict temperature distribution and thermal stresses. A conjugate heat transfer (CHT) method is used in a 3D academic code, FLUENT, to predict heat flux and the coupled non-adiabatic external flow field and temperature field on the inner, cage and outer rotor with a Finite Volume Method (FVM). Thermo-elastic behavior of the laminated components are assigned through anisotropic materialistic characters in a finite element method (FEM), where the thermal and centrifugal stresses are calculated.
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Khatab, M. F., Z. Zhu, H. Li, and Y. Liu. "Comparative Study of Axial Flux Magnetically Geared Machine with Conventional Axial Flux YASA Machine." In 2018 IEEE International Magnetic Conference (INTERMAG). IEEE, 2018. http://dx.doi.org/10.1109/intmag.2018.8508859.

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Sulaiman, E., and S. Zakaria. "Mitigation of magnetic flux saturation in dual-excitation flux switching motor." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157226.

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Syed, Q., and I. Hahn. "Parametric Optimization of Flux Focusing Type Double Stator and Single Rotor Axial Flux Permanent Magnet Motor." In 2018 IEEE International Magnetic Conference (INTERMAG). IEEE, 2018. http://dx.doi.org/10.1109/intmag.2018.8508707.

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Dutta, Sushant M., and Fathi H. Ghorbel. "Magnetic Flux Leakage Sensing: Current Practices and Mathematical Analysis." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42481.

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In this paper, we analyze magnetic flux leakage (MFL) sensing for the nondestructive evaluation (NDE) of ferromagnetic specimens. Understanding the processes involved in the creation of magnetic flux leakage fields and their measurement is critical to robotic inspection applications. In particular, robotic inspection of energy pipelines uses mobile robots to magnetize sections of the pipe and to measure the MFL signal to detect defects. We study current practices and motivate the need for improvements. To facilitate the analysis, we develop an analytical model to represent the 3-dimensional magnetic flux leakage field due to a surface-breaking defect in the specimen. The model is derived from first principles using the concept of dipole magnetic charge, and uses surface integrals to represent the MFL field as measured by a Hall-effect sensor. Simulations are performed which generate novel results, apart from reproducing experimental results from the literature. The mathematical tractability of the model is exploited to analyze its properties, such as scale–invariance, influence of lift-off, and the tangential MFL component. These properties give new insight into MFL sensing, interpretation, and defect characterization.
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Shoaei, Aran, and Qingsong Wang. "Axial Dual-Flux-Modulator Magnetic Gear Mitigating Yoke Flux Leakage." In 2023 3rd International Conference on Electrical Machines and Drives (ICEMD). IEEE, 2023. http://dx.doi.org/10.1109/icemd60816.2023.10429592.

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Aoyama, Masahiro, and Toshihiko Noguchi. "Flux Intensifying PM-Motor with Variable Leakage Magnetic Flux Technique." In 2018 International Power Electronics Conference (IPEC-Niigata 2018-ECCE Asia). IEEE, 2018. http://dx.doi.org/10.23919/ipec.2018.8508023.

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Reports on the topic "Magnetic flux"

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Fischer, Gregory A., and Alan S. Edelstein. Modeling of a Magnetic Flux Concentrator. Fort Belvoir, VA: Defense Technical Information Center, March 2004. http://dx.doi.org/10.21236/ada488075.

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Martin, Sara F. Studies of Flares and Disappearing Magnetic Flux. Fort Belvoir, VA: Defense Technical Information Center, March 1988. http://dx.doi.org/10.21236/ada201456.

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Ferrari, M. J. Magnetic flux noise in copper oxide superconductors. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/5761206.

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Tsui, Chi-Wa. Magnetic flux reconstruction methods for shaped tokamaks. Office of Scientific and Technical Information (OSTI), December 1993. http://dx.doi.org/10.2172/10117754.

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Ferrari, Mark Joseph. Magnetic flux noise in copper oxide superconductors. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/10133034.

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Lord. L51596 Flux Distribution - Pipeline Flaws. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 1989. http://dx.doi.org/10.55274/r0010532.

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Describes the use of finite element analysis to carry out magnetic flux leakage studies intended to optimize the design of pipeline flaw detection vehicles based on this technology. The report provides predictions based on this approach supported by experimental measurement for a wide variety of defect shapes.
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Gibson, Sarah, Yuhong Fan, and K. D. Leka. Emergence of Twisted Magnetic Flux into the Corona. Fort Belvoir, VA: Defense Technical Information Center, July 2005. http://dx.doi.org/10.21236/ada437321.

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Cannell, Michael J., and Richard A. McConnell. Magnetic Flux-Load Current Interactions in Ferrous Conductors. Fort Belvoir, VA: Defense Technical Information Center, June 1992. http://dx.doi.org/10.21236/ada256632.

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C.Z. Cheng, Y. Ren, G.S. Choe, and Y.-J. Moon. Flux Rope Acceleration and Enhanced Magnetic Reconnection Rate. US: Princeton Plasma Physics Lab., NJ (US), March 2003. http://dx.doi.org/10.2172/813604.

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Nestleroth. PR-337-063508-R01 Dual Field Magnetic Flux Leakage (MFL) Inspection Technology to Detect Mechanical Damage. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2013. http://dx.doi.org/10.55274/r0010575.

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This report details the development and testing of a dual magnetization in-line inspection (ILI) tool for detecting mechanical damage in operating pipelines, including the first field trials of a fully operational dual-field magnetic flux leakage (MFL) ILI tool. Augmenting routine MFL corrosion inspection of pipelines using high magnetic fields, this in-line inspection technique detects and assesses mechanical damage using a second lower magnetic field. Nearly all commercially available MFL tools use high magnetic fields to detect and size metal loss such as corrosion. A lower field than commonly applied for detecting metal loss is appropriate for detecting mechanical damage, such as the metallurgical changes caused by impacts from excavation equipment. The lower field is needed to counter the saturation effect of the high magnetic field, which masks and diminishes important components of the signal associated with mechanical damage. At low fields, other properties such as pipeline chemical composition, grain structure, and fabrication methods can also be detected.
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