Relevant bibliographies by topics / Direct current magnetic field

Contents

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

Academic literature on the topic 'Direct current magnetic field'

Author: Grafiati
Published: 5 June 2025
Last updated: 16 July 2025

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Journal articles on the topic "Direct current magnetic field"

1

Zhyltsov, A. V., and V. V. Lyktei. "MAGNETIC FIELD CALCULATION OF BRUSHLESS DIRECT CURRENT MOTOR WITH SMOOTH STATOR BY SECONDARY SOURCES METHOD." Tekhnichna Elektrodynamika 2018, no. 5 (2018): 7–10. http://dx.doi.org/10.15407/techned2018.05.007.

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Akhmadjonova, Kholisa Samatillo qizi. "EVELOPMENT OF VIRTUAL LABORATORY WORK ON THE TOPIC "DIRECT CURRENT MAGNETIC FIELD" (using the LabVIEW program)." International journal of advanced research in education, technology and management 2, no. 6 (2023): 356–64. https://doi.org/10.5281/zenodo.8053054.

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The use of virtual laboratories in the educational process provides an opportunity for students to achieve high efficiency in physics, to acquire a large amount of knowledge by spending less time. From this point of view, this issue is an urgent issue of today. The article describes the ideas of developing a virtual laboratory work on the topic "Magnetic field of constant current".  
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Nonoyama, Shinji, and Akira Oguri. "Direct calculation of nonequilibrium current in a magnetic field." Physica B: Condensed Matter 284-288 (July 2000): 1874–75. http://dx.doi.org/10.1016/s0921-4526(99)02916-6.

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WALUYO, WALUYO, Lita LIDYAWATI, ROHANA ROHANA, and Mochamad Sanny HERMAWAN. "Comparisons of Rice Seed Growths Due to Alternating and Direct Current Electric and Magnetic Field Influences." Electrotehnica, Electronica, Automatica 72, no. 2 (2024): 41–53. http://dx.doi.org/10.46904/eea.23.72.2.1108005.

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It is commonly known that electric and magnetic fields of power transmission negatively and positively influence plants. Unfortunately, studies on these influences are minimal, particularly considering the comparison between magnetic field and electric field, on both DC (direct current) and AC (alternating current). This research aims to compare the influences of magnetic field and electric field, both on AC and DC, on rice plant growth. Firstly, prototypes, including the equipment, were constructed to generate AC and DC electric fields using parallel plates of a medium voltage transformer and Cockroft-Walton circuits. Meanwhile, the AC and DC magnetic fields were prepared using three different diameter current-injected coils. The rice seeds were exposed to electric and magnetic fields for one month, with plate distance and coil diameter variations. The results showed that the rice seeds grew differently according to the respective types and magnitudes of the fields. In the first two days, the rice seed growths exposed to electric and magnetic fields were higher than those without field exposures. However, since the thirteenth day, the rice growth rate with field exposure was lower than without. This study also shows that the influences of the DC electric and magnetic fields were more potent than the AC fields. The averages of rice seed growth decreasing rate for the AC and DC electric fields and AC and DC magnetic fields were 0.00827 cm/(kV/m), 0.01167 cm/(kV/m), -0.13267 cm/mT and 1.99005 cm/mT, respectively. As a general suggestion in sites, rice plants should be avoided from a transmission line due to high voltage direct current (DC) rather than that alternating current (AC).
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Froment, C., V. Krasnoselskikh, T. Dudok de Wit, et al. "Direct evidence for magnetic reconnection at the boundaries of magnetic switchbacks with Parker Solar Probe." Astronomy & Astrophysics 650 (June 2021): A5. http://dx.doi.org/10.1051/0004-6361/202039806.

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Context. The first encounters of Parker Solar Probe (PSP) with the Sun revealed the presence of ubiquitous localised magnetic deflections in the inner heliosphere; these structures, often called switchbacks, are particularly striking in solar wind streams originating from coronal holes. Aims. We report the direct piece of evidence for magnetic reconnection occurring at the boundaries of three switchbacks crossed by PSP at a distance of 45 to 48 solar radii to the Sun during its first encounter. Methods. We analyse the magnetic field and plasma parameters from the FIELDS and Solar Wind Electrons Alphas and Protons instruments. Results. The three structures analysed all show typical signatures of magnetic reconnection. The ion velocity and magnetic field are first correlated and then anti-correlated at the inbound and outbound edges of the bifurcated current sheets with a central ion flow jet. Most of the reconnection events have a strong guide field and moderate magnetic shear, but one current sheet shows indications of quasi anti-parallel reconnection in conjunction with a magnetic field magnitude decrease by 90%. Conclusions. Given the wealth of intense current sheets observed by PSP, reconnection at switchback boundaries appears to be rare. However, as the switchback boundaries accomodate currents, one can conjecture that the geometry of these boundaries offers favourable conditions for magnetic reconnection to occur. Such a mechanism would thus contribute in reconfiguring the magnetic field of the switchbacks, affecting the dynamics of the solar wind and eventually contributing to the blending of the structures with the regular wind as they propagate away from the Sun.
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Murata, H. "Magnetic field intensification and formation of field-aligned current in a non-uniform magnetic field." Journal of Plasma Physics 46, no. 1 (1991): 29–48. http://dx.doi.org/10.1017/s0022377800015932.

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A study is made of the induction of a direct field-aligned current due to Alfvén waves excited through an initial–boundary condition for an incompressible fluid with high conductivity in a non-uniform magnetic field. A simple but exact case is considered in which the direction of inhomogeneity of the magnetic field is perpendicular to that of the shear fluid motion at the boundary, and the fluid moves across the magnetic field. The boundary does not satisfy the frozen-flux condition, but has a large Lundquist number. The conductivity of the fluid held between the two boundaries is high, and the frozen-flux condition is approximately satisfied there. A preflare stage of the sun is investigated, and a reasonable magnetic field intensity and d.c. field-aligned current in the magnetic arcade are obtained for a given horizontal shear motion that is antisymmetric at both boundaries of the arcade foot points, taking account of the observed horizontal fluid motion.
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Slinkman, David, Fred Braid, and Richard Sacks. "Magnetic-field modulation of a two-electrode direct-current plasma." Spectrochimica Acta Part B: Atomic Spectroscopy 45, no. 11 (1990): 1211–23. http://dx.doi.org/10.1016/0584-8547(90)80065-q.

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Xu, Xian Jin, Hao Da Chen, Zhi Yong Yang, Shi Chao Hu, and Yu Yan. "Magnetic linear driving method for high-voltage direct current inspection robot." International Journal of Advanced Robotic Systems 17, no. 3 (2020): 172988142093093. http://dx.doi.org/10.1177/1729881420930933.

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Faced with the problem of frequent slippage of the wheel-arm inspection robot in overhead high-voltage transmission lines, a magnetic linear drive method, based on high-voltage direct current (HVDC) magnetic field, is proposed: The ampere force of an enhanced HVDC magnetic field, generated by an innovatively arranged current-carrying coil, is used as the driving force for the traction robot, replacing the traditional wheel-arm driving method, thereby eliminating the slip. A physical model for the magnetic driving force is established, according to the characteristics of the magnetic field around the HVDC transmission line and the driving force requirements of the robot. The relationship between the magnetic driving force, the physical model size, and the number of coil windings is analyzed. The magnetic drive model is simulated using the COMSOL software version is 5.0. The simulation results of the magnetic drive force model are compared to theoretical calculations, proving the proposed method as correct. The magnetic drive device is constructed according to the proposed magnetic drive model and experiments are carried out. The results show that the magnetic drive device can provide enough traction to drive the robot motion, proving that the proposed magnetic linear drive method is technically feasible.
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KOSENKOV, Volodymyr, Dmytro IVLIEV, Oleksandr VYNAKOV, Elvira SAVOLOVA, and Viktoria YARMOLOVYCH. "USE OF T-SHAPED TOOTH IN A DIRECT CURRENT MACHINE WITH A WINDLESS ROTOR." Herald of Khmelnytskyi National University. Technical sciences 311, no. 4 (2022): 110–14. http://dx.doi.org/10.31891/2307-5732-2022-311-4-110-114.

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The electric direct current machine with a windingless rotor (DCWR) is significantly different from the classic direct current machine; its magnetic system does not have a common yoke and consists of a number of magnetically loose teeth and grooves open on both sides. The presence of grooves in which there is no bottom creates a number of air gaps, which leads to a decrease in the magnetic conductivity of the magnetic conductor in the transverse direction, which, again, leads to a weakening of the reaction field of the Фa armature and the rejection of additional poles and compensation winding. Therefore, the size of the working air gap can be reduced to the minimum possible value from a technological point of view. According to the structural schemes, the DCWR belongs to the type of induction machines with two stationary windings on the stator and a toothed magnetic conductor of the rotor, in which the magnetic induction in the working air gap changes only in magnitude without changing the sign. Therefore, the rotor in the DCWR is not remagnetized and is made of ordinary structural steel. The inductor type of the magnetic system allows having only one, common for all poles, excitation winding in the DCWR, and the rotor is very similar to the rotor of multi-pole synchronous machines with permanent incorporated magnets. At the same time, DCWR does not have permanent magnets, which allows to significantly reduce the cost of an electric machine. Replacing straight teeth with T-shaped ones allows you to significantly increase the efficiency of the DCWR design by improving its heat dissipation. The results of calculations and modeling of the stationary thermal field presented in the article show that the use of T-shaped teeth allows you to significantly increase the overload capacity of the DCWR or increase its power.
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Primdahl, F., and G. Marklund. "Birkeland currents correlated with direct-current electric fields observed during the CENTAUR Black Brant X rocket experiment." Canadian Journal of Physics 64, no. 10 (1986): 1412–16. http://dx.doi.org/10.1139/p86-250.

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Vector magnetic-field observations from two rocket flights in the winter polar cusp during the CENTAUR project show several groups of upward and downward flowing small-scale Birkeland current sheets in the afternoon region of the cusp, whereas none are detected at noon. High correlation with electric-field observations allow calculation of the height-integrated Pedersen conductivity, and an estimate is made of the ionospheric input power density associated with the Birkeland currents. This input power density is comparable to that of a similar summertime experiment at nearly the same magnetic local time and under almost the same interplanetary magnetic-field conditions, despite an order-of-magnitude difference in ionospheric conductivity. Indications are that the magnetospheric energy source for these two events more closely resembles a constant-power generator rather than a constant-voltage or a constant-current generator.
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Dissertations / Theses on the topic "Direct current magnetic field"

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Miller, Kenneth Elric. "The star thrust experiment, rotating magnetic field current drive in the field reversed configuration /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/9996.

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Peter, Andrew Maxwell. "Paramagnetic spin-up of a field reversed configuration with rotating magnetic field current drive /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/9983.

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Simm, Anthony. "Quantitative interpretation of magnetic field measurements in eddy current defect detection." Thesis, University of Newcastle Upon Tyne, 2013. http://hdl.handle.net/10443/1809.

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For many years, the theoretical and experimental study of eddy current non-destructive evaluation (NDE) has been conducted separately, as most models were not suited to practical industrial applications. The aim of this work is to bridge this gap by investigating the relationship between magnetic fields and defects using both modelling and experimental study and to link these results to quantitative NDE. In this work, 3D FEM numerical simulations are used to predict the response of an eddy current probe being scanned over the area of a defect and understand the underlying change in magnetic field due to the presence of the defect. Experimental investigations are performed to study the feasibility of the proposed magnetic field measurement techniques for defect detection. This experimental work investigates the inspection of both surface and subsurface defects, the use of rectangular (directional) probes and the measurement of complex magnetic field values, as the response in these cases has been found to have a greater correlation with the shape of the defect being studied. As well as the detection of defects, both frequency spectrum and transient information from pulsed eddy current responses are used to reconstruct the profile (depth and width) of a slot shaped defect. The work concludes that the use of magnetic field measurements provides useful information for defect detection and quantification. This will have applications in both industrial and research areas, including visualisation of defects from magnetic field measurements, which can be applied to the monitoring of safety critical components.
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Kurpad, Krishna Nagaraj. "Transmit field pattern control for high field magnetic resonance imaging with integrated RF current sources." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2755.

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The primary design criterion for RF transmit coils for MRI is uniform transverse magnetic (B1) field. Currently, most high frequency transmit coils are designed as periodic, symmetric structures that are resonant at the imaging frequency, as determined by the static magnetic (B0) field strength. These coils are excited by one or more voltage sources. The distribution of currents on the coil elements or rungs is determined by the symmetry of the coil structure. At field strengths of 3T and above, electric properties such as the dielectric constant and conductivity of the load lead to B1 field inhomogeneity due to wavelength effects and perturbation of the coil current distribution from the ideal. The B1 field homogeneity under such conditions may be optimized by adjusting the amplitudes and phases of the currents on the rungs. However, such adjustments require independent control of current amplitudes and phases on each rung of the resonant coil. Due to both the strong coupling among the rungs of a resonant coil and the sensitivity to loading, such independent control would not be possible and B1 homogeneity optimization would involve a time consuming and impractical iterative procedure in the absence of exact knowledge of interactions among coil elements and between the coil and load. This dissertation is based on the work done towards the design and development of a RF current source that drives high amplitude RF current through an integrated array element. The arrangement is referred to as a current element. Independent control of current amplitude and phase on the current elements is demonstrated. A non-resonant coil structure consisting of current elements is implemented and B1 field pattern control is demonstrated. It is therefore demonstrated that this technology would enable effective B1 field optimization in the presence of lossy dielectric loads at high field strengths.
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Bai, Kun. "Direct field-feedback control for permanent magnet spherical motors." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50141.

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There are emerging requirements for high accuracy multi-DOF actuators in numerous applications. As one of the novel motors capable of multi-DOF manipulation, permanent magnet spherical motors (PMSMs) that can provide continuous and dexterous motion in one joint have been widely studied for their advantages in structure and energy efficiency. The demands to bring forward the performance of PMSMs for precision applications have motivated this thesis to develop a closed-loop orientation control system with high accuracy and bandwidth. Unlike traditional control methods for PMSMs, which rely on explicit orientation feedback, a new control method (referred to here as direct field-feedback control or in short DFC) directly utilizing the magnetic fields for feedback have been developed in this thesis. Because magnetic field measurements are almost instantaneous and the need for real-time orientation estimation is eliminated in DFC, the system sampling time is greatly reduced. Meanwhile, several field-based methods have been developed for the major components in the DFC system and each component can be processed independently and concurrently with the magnetic field measurements. The parallel computation further improves the system bandwidth and also reduces accumulated error. The DFC system has been experimentally implemented and evaluated. The results show excellent control performances in terms of accuracy and bandwidth. To facilitate the design and analysis of the DFC system, several new algorithms have been developed, which include the modeling and computing of magnetic fields as well as forces and torques, an analysis of bijective relationship between orientation and magnetic fields, and a method for calibration and reconstruction of the rotor magnetic field in 3 dimensional space. These algorithms not only enable the implementation of the DFC system for a PMSM, but also benefit the PMSM studies in design, modeling and field-based sensing. While the immediate outcome of this research is a control system for PMSMs, this new control method can be applied to a broad spectrum of electromagnetic motion systems.
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Laestadius, Andre. "Foundation of Density Functionals in the Presence of Magnetic Field." Doctoral thesis, KTH, Matematik (Avd.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145546.

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This thesis contains four articles related to mathematical aspects of Density Functional Theory. In Paper A, the theoretical justification of density methods formulated with current densities is addressed. It is shown that the set of ground-states is determined by the ensemble-representable particle and paramagnetic current density. Furthermore, it is demonstrated that the Schrödinger equation with a magnetic field is not uniquely determined by its ground-state solution. Thus, a wavefunction may be the ground-state of two different Hamiltonians, where the Hamiltonians differ by more than a gauge transformation. This implies that the particle and paramagnetic current density do not determine the potentials of the system and, consequently, no Hohenberg-Kohn theorem exists for Current Density Functional Theory formulated with the paramagnetic current density. On the other hand, by instead using the particle density as data, we show that the scalar potential in the system's Hamiltonian is determined for a fixed magnetic field. This means that the Hohenberg-Kohn theorem continues to hold in the presence of a magnetic field, if the magnetic field has been fixed. Paper B deals with N-representable density functionals that also depend on the paramagnetic current density. Here the Levy-Lieb density functional is generalized to include the paramagnetic current density. It is shown that a wavefunction exists that minimizes the "free" Hamiltonian subject to the constraints that the particle and paramagnetic current density are held fixed. Furthermore, a convex and universal current density functional is introduced and shown to equal the convex envelope of the generalized Levy-Lieb density functional. Since this functional is convex, the problem of finding the particle and paramagnetic current density that minimize the energy is related to a set of Euler-Lagrange equations. In Paper C, an N-representable Kohn-Sham approach is developed that also include the paramagnetic current density. It is demonstrated that a wavefunction exists that minimizes the kinetic energy subject to the constraint that only determinant wavefunctions are considered, as well as that the particle and paramagnetic current density are held fixed. Using this result, it is then shown that the ground-state energy can be obtained by minimizing an energy functional over all determinant wavefunctions that have finite kinetic energy. Moreover, the minimum is achieved and this determinant wavefunction gives the ground-state particle and paramagnetic current density. Lastly, Paper D addresses the issue of a Hohenberg-Kohn variational principle for Current Density Functional Theory formulated with the total current density. Under the assumption that a Hohenberg-Kohn theorem exists formulated with the total current density, it is shown that the map from particle and total current density to the vector potential enters explicitly in the energy functional to be minimized. Thus, no variational principle as that of Hohenberg and Kohn exists for density methods formulated with the total current density.<br><p>QC 20140523</p>
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Guldemir, Hanifi. "Prediction of induction motor line current spectra from design data." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287180.

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Zhang, Yanjing. "Electric and magnetic contributions and defect interactions in remote field eddy current techniques." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq22507.pdf.

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Kato, K., T. Noda, H. Shimizu, T. Matsumura, and N. Murayama. "Increase in transient resistance of Bi2223 superconducting bulk by applying external magnetic field." IEEE, 2001. http://hdl.handle.net/2237/6784.

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Hasanyan, Jalil Davresh. "Modeling and Analysis of a Moving Conductive String in a Magnetic Field." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/87530.

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A wide range of physical systems are modeled as axially moving strings; such examples are belts, tapes, wires and fibers with applied electromagnetic fields. In this study, we propose a model that describes the motion of a current-carrying conductive string in a lateral magnetic field, while it is being pulled axially. This model is a generalization of past studies that have neglected one or more properties featured in our system. It is assumed that the string is moving with a constant velocity between two rings that are a finite distance apart. Directions of the magnetic field and the motion of the string coincide. The problem is first considered in a static setting. Stability critical values of the magnetic field, pulling speed, and current are shown to exist when the uniform motion (along a string line) of the string buckles into spiral forms. In the dynamic setting, conditions for stability of certain solutions are presented and discussed. It is shown that there is a divergence between the critical values in the linear dynamic and static cases. Furthermore, traveling wave solutions are examined for certain cases of our general system. We develop an approximate solution for a nonlinear moving string when a periodic nonstationary current flows through the string. Domains of parameters are defined when the string falls into a pre-chaotic state, i.e., the frequency of vibrations is doubled.<br>MS
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Books on the topic "Direct current magnetic field"

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Sharifi, Masoud. Magnetic field modelling of a Direct Current Electric ARC Furnace. National Library of Canada, 1994.

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K, Carney Harold, and Langley Research Center, eds. 1984 direct strike lightning data. National Aeronautics and Space Administration, Langley Research Center, 1986.

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Chen, Lu, Larson Douglas J, and United States. National Aeronautics and Space Administration., eds. Cross-tail current, field-aligned current, and B y. National Aeronautics and Space Administration, 1994.

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Chen, Lu, Larson Douglas J, and United States. National Aeronautics and Space Administration., eds. Cross-tail current, field-aligned current, and B y. National Aeronautics and Space Administration, 1994.

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Zhen, Lu, Larson Douglas J, and United States. National Aeronautics and Space Administration., eds. Cross-tail current, field-aligned current, and B y. National Aeronautics and Space Administration, 1994.

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International Symposium on Transcranial Magnetic Stimulation (2nd 2003 Göttingen, Germany). Transcranial magnetic stimulation and transcranial direct current stimulation: Proceedings of the 2nd International Transcranial Magnetic Stimulation (TMS) and Transcranial Direct Current Stimulation (tDCS) Symposium, Göttingen, Germany, 11-14 June 2003. Elsevier, 2003.

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S, Daniels Taumi, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. A linearly controlled direct-current power source for high-current inductive loads in a magnetic suspension wind tunnel. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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United States. National Aeronautics and Space Administration., ed. Current collection in a magnetic field: Final report of E.N. Krivorutsky, Spring 1997. National Aeronautics and Space Administration, 1997.

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United States. National Aeronautics and Space Administration., ed. Final technical report on generation of field-aligned current in the auroral zone (zone grant NAGW-1606). National Aeronautics and Space Administration, 1991.

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T, Wu S., Tandberg-Hanssen E. 1921-, and United States. National Aeronautics and Space Administration., eds. Disruption of helmet streamers by current emergence. National Aeronautics and Space Administration, 1996.

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Book chapters on the topic "Direct current magnetic field"

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Rego, Gabriel, Lucas Murrins Marques, Marília Lira da Silveira Coêlho, and Paulo Sérgio Boggio. "Modulating the Social and Affective Brain with Transcranial Stimulation Techniques." In Social and Affective Neuroscience of Everyday Human Interaction. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08651-9_15.

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AbstractTranscranial brain stimulation (TBS) is a term that denotes different noninvasive techniques which aim to modulate brain cortical activity through an external source, usually an electric or magnetic one. Currently, there are several techniques categorized as TBS. However, two are more used for scientific research, the transcranial magnetic stimulation (TMS) and the transcranial direct current stimulation (tDCS), which stimulate brain areas with a high-intensity magnetic field or a weak electric current on the scalp, respectively. They represent an enormous contribution to behavioral, cognitive, and social neuroscience since they reveal how delimited brain cortical areas contribute to some behavior or cognition. They have also been proposed as a feasible tool in the clinical setting since they can modulate abnormal cognition or behavior due to brain activity modulation. This chapter will present the standard methods of transcranial stimulation, their contributions to social and affective neuroscience through a few main topics, and the studies that adopted those techniques, also summing their findings.
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Fernandes, Sofia Rita, Ricardo Salvador, Mamede de Carvalho, and Pedro Cavaleiro Miranda. "Modelling Studies of Non-invasive Electric and Magnetic Stimulation of the Spinal Cord." In Brain and Human Body Modeling 2020. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45623-8_8.

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AbstractExperimental studies on transcutaneous spinal cord direct current and magnetic stimulation (tsDCS and tsMS, respectively) show promising results in the neuromodulation of spinal sensory and motor pathways, with possible clinical application in spinal functional rehabilitation. Modelling studies on the electric field (EF) distribution during tsDCS and tsMS can be powerful tools to understand the underlying biophysics and to guide stimulation protocols for a specific clinical target. In this chapter, we review modelling studies of tsDCS and report on our own modelling findings on tsDCS and tsMS. We discuss the main differences between the EF induced by these two stimulation techniques and the implications for clinical practice, addressing the relevance of modelling studies for more personalized target protocols and individualized dosing.
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Alken, P., A. Maute, and A. D. Richmond. "The F $F$ -Region Gravity and Pressure Gradient Current Systems: A Review." In Earth's Magnetic Field. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1225-3_15.

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Olsen, Nils, and Claudia Stolle. "Magnetic Signatures of Ionospheric and Magnetospheric Current Systems During Geomagnetic Quiet Conditions—An Overview." In Earth's Magnetic Field. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1225-3_2.

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Gooch, Jan W. "Magnetic Field Due to a Current." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7128.

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Bohnert, Klaus. "Further Magnetic Field and Current Sensors." In Optical Fiber Current and Voltage Sensors. CRC Press, 2024. http://dx.doi.org/10.1201/9781003100324-13.

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Johnstone, Ainslie, Emily Hinson, and Charlotte J. Stagg. "tDCS and Magnetic Resonance Imaging." In Transcranial Direct Current Stimulation in Neuropsychiatric Disorders. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-33967-2_10.

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Johnstone, Ainslie, Emily Hinson, and Charlotte J. Stagg. "tDCS and Magnetic Resonance Imaging." In Transcranial Direct Current Stimulation in Neuropsychiatric Disorders. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76136-3_8.

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Bousseksou, A., F. Varret, M. Goiran, K. Boukheddaden, and J. P. Tuchagues. "The Spin Crossover Phenomenon Under High Magnetic Field." In Topics in Current Chemistry. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b95422.

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Chandler, George. "Fiber Optic Magnetic Field and Current Sensors." In Fast Electrical and Optical Measurements. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-017-0445-8_4.

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Conference papers on the topic "Direct current magnetic field"

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Cameron, R. M., W. S. Halliday, and S. L. Richards. "Airborne Remote Sensing of Pipeline Cathodic Protection Systems." In CORROSION 1992. NACE International, 1992. https://doi.org/10.5006/c1992-92385.

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Abstract This paper describes the principles, operation, and testing of an Airborne Cathodic Monitoring System (ACMS)(1) that detects upset conditions on pipelines protected by impressed current. ACMS consists of a battery of highly sensitive and highly filtered magnetic field coils, installed on a helicopter or light airplane, that continuously measure the magnetic field generated by the ripple from an alternating current source. Measurement of the magnetic field leads to a direct determination of current along the pipeline. Upset conditions on the cathodic protection system and the pipeline can be deduced by analysis of the rate-of-change of current. Combined with ground measurements of voltages and currents at adjacent rectifiers and at sample test points along the pipeline, ACMS data can accurately determine voltage and amperage values at any point between adjacent rectifiers. Up to 200 miles of pipeline can be surveyed in one day with ACMS---at about half the cost of an equivalent close-interval survey. An ancillary desktop computer program can be used to rapidly detect changes to the cathodic system and the pipeline between surveys. On 6 November 1991, the Office of Pipeline Safety, Department of Transport, officially recognized ACMS as an acceptable method of pipeline inspection and monitoring1.
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Jarram, Paul. "Remote Measurement of Stress in Carbon Steel Pipelines - Developments in Remote Magnetic Monitoring." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07181.

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Abstract Monitoring the integrity of buried ageing ferromagnetic pipelines is a significant problem for infrastructure operators. Typically inspection relies on pig surveys, Direct Current Voltage Gradient (DCVG), Close Interval Potential Survey (CIPS) and contact Non-destructive testing (NDT) methods that often require pipes to be excavated and exposed at great expense. This paper outlines recent developments in a novel remote sensing technique to detect corrosion, metal defects and the effects of ground movement on pipeline stress by mapping variations in the earth's magnetic field around pipelines. Magnetostriction and its inverse, the Villari effect, is the process by which randomly oriented magnetic domains develop inside the structure of ferromagnetic materials, such as carbon steel alloys, in response to localised stress resulting in detectable magnetic anomalies in the background magnetic field. Corrosion, metallurgical defects and ground movements result in areas of increased localised stress in pressurised pipelines, which in turn generates a localised magnetic field. Measurement of the remote magnetic field around a pipeline due to magnetostriction allows the measurement of stress and determines the location of defects in the pipe wall. The paper first summarizes magnetostriction in ferromagnetic materials and then describes how measurements of remote magnetic field can be applied to define the location of defects in operational pipelines along with the benefits and limitations of using this technique. These include considerable cost savings since no modification to the line is required, no input of energy or change to its operational parameters is needed and, crucially, no excavations are needed to calibrate preliminary results
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Land, Jason, Thomas Yahner, and Shane Finneran. "Transformer Use for Mitigating Induced Alternating Current Effects on Pipelines." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-11242.

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Abstract Pipelines located near high voltage alternating current (AC) transmission lines may be subjected to induced AC current buildup. Present mitigation strategies employ parallel electrical paths, effectively dumping excess electrical charge safely to ground. These strategies use capacitors to stop direct current flow down these parallel paths which maintains the integrity of cathodic protection systems installed on the pipeline while allowing induced AC currents to freely take the parallel path to ground. Experimentation was performed to determine if there might be a way to further reduce the AC voltages on pipelines better than the existing system of just using parallel ground paths as a mitigation technique. Transformers can be added to the grounding path design to create a resonant condition, referred to as a RLC circuit consisting of a resistor (R), inductor (L), and capacitor (C), from the known frequency of the induced AC which will remove energy from the circuit in the form of a magnetic field or electric field. When a RLC circuit is tuned to its resonant condition the power angle is zero, thus removing unnecessary impedance due to capacitance only, which is the case for current AC mitigation designs. Additionally, a transformer can be designed to transfer energy to the secondary effectively helping drain energy which reduces the induced voltage on the AC mitigated pipeline and the total energy returning to ground.
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Janda, Dennis, Christophe Baeté, and Leslie Bortels. "A New Approach to Pipeline Integrity – Combining In-Line Inspection and Cathodic Protection Simulation Technology." In CORROSION 2013. NACE International, 2013. https://doi.org/10.5006/c2013-02239.

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Abstract The integrity of pipelines can be assessed by using in-line inspection (ILI) tools and direct assessment (DA) methods. Conventional ILI techniques like magnetic flux leakage (MFL) and ultrasonic thickness (UT) quantify the severity of corrosion that has already occurred, but they do not give any information on the performance of the cathodic protection (CP) system. Traditional DA data often require a great deal of interpretation, leaving unanswered questions about what is really happening on the pipeline and more importantly, what to do about it. Traditional DA surveys are slow, labor intensive, operator-dependent, and costly to execute. This paper presents an advanced inspection method that combines a CP current measurement ILI tool with a CP simulation technology. The ILI CP tool measures the true electrical current patterns on the pipe that originate from a CP system or interference source. The current density data from the CP ILI tool are then used by the simulation model to predict pipe-to-soil potentials. A case study is discussed where a simulation model is constructed for an 8 in. (219 mm) pipeline 16.15 miles (26 km) in length. The axial current measured by the CP tool is used by the model to predict the local coating resistance, local ON/OFF potentials, and enables prediction of the corrosion risk. This combined approach offers the benefit that a simulation model can be developed that fits well to the actual conditions of the pipeline with a minimum of assumptions. Through modeling, the CP system can be further improved by running different “what-if” scenarios such as changing the rectifier outputs, connecting/disconnecting bonds, changing coating condition (e.g., long-term degradation), varying soil resistivity, etc., with a minimum amount of survey cost and greatly reduced field time.
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Wu, Kena, Zhi-Hao Ye, Zhaohui Wu, Yuelin Liu, Shengdao Liu, and Jun Ouyang. "Research on Magnetic Field Similarity in the Production of Eddy Current Magnetic Field Scaling Model." In 2024 Photonics & Electromagnetics Research Symposium (PIERS). IEEE, 2024. http://dx.doi.org/10.1109/piers62282.2024.10618405.

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Bjegović, Dubravka, Jessica Jackson Meyer, Dunja Mikulić, and Dalibor Sekulić. "Corrosion Measurement in Concrete Utilizing Different Sensor Technologies." In CORROSION 2003. NACE International, 2003. https://doi.org/10.5006/c2003-03435.

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Abstract Degradation of concrete structures due to corrosion of embedded steel reinforcement is an important problem with regards to durability and safety, with great economical consequences. One method for corrosion prevention is the application of corrosion inhibitors. Corrosion inhibitors can be applied as additives to new concrete during the batching process, or surface applied to existing concrete structures. This paper gives an overview of existing sensor technologies, previews new technologies, and proposes suitable methods for corrosion monitoring and inhibitor efficiency investigation on real structures. Many different sensor technologies have been developed, and new ones are under research. Advantages and disadvantages of different corrosion determination approaches are also discussed. Half-cell reference electrodes, linear polarization sensors, localized electrochemical impedance spectroscopy sensors and macrocell current sensors are based on electrochemical principles. Non-electrochemical sensors work on physical principles such as the Hall effect, magnetic flux leakage, magnetostrictive effect, eddy currents and on light modulation (Fiber optic sensors). Fiber optic sensors have many advantages such as immunity to chemical environments, long-term stability, and the ability to make distributed measurements of several parameters with a single sensor. However, they are underdeveloped in the field of concrete reinforcement corrosion. Fiber optic sensors can measure corrosion directly, or indirectly by measuring factors that influence the corrosion process (pH value, Cl- concentration, water content in concrete, CO2), and can also detect cracks due to corrosion.
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Qiu, Rujia, Teng Tian, Long Zhao, et al. "Multi-Layer Magnetic Shielding Design for TMR-Based Direct Current Sensors." In 2024 4th International Conference on Electronic Information Engineering and Computer (EIECT). IEEE, 2024. https://doi.org/10.1109/eiect64462.2024.10867174.

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Woods, S. I., Nesco M. Lettsome, A. B. Cawthorne, L. A. Knauss, and R. H. Koch. "High Resolution Current Imaging by Direct Magnetic Field Sensing." In ISTFA 2003. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.istfa2003p0006.

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Abstract Two types of magnetic microscopes have been investigated for use in high resolution current mapping. The scanning fiber/SQUID microscope uses a SQUID sensor coupled to a nanoscale ferromagnetic probe, and the GMR microscope employs a nanoscale giant magnetoresistive sensor. Initial scans demonstrate that these microscopes can resolve current lines less than 10 µm apart with edge resolution of 1 µm. These types of microscopes are compared with the performance of a standard scanning SQUID microscope and with each other with respect to spatial resolution and magnetic sensitivity. Both microscopes show great promise for identifying current defects in die level devices.
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Fu, W. N., and S. L. Ho. "A direct circuit parameter extraction method of two-dimensional eddy-current magnetic field." In 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC 2010). IEEE, 2010. http://dx.doi.org/10.1109/cefc.2010.5481732.

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Apollonskii, Stanislav M., and Anatoliy N. Gorsky. "Calculation of electric and magnetic field strengths produced by a direct current traction network." In IEEE EUROCON 2009 (EUROCON). IEEE, 2009. http://dx.doi.org/10.1109/eurcon.2009.5167737.

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Reports on the topic "Direct current magnetic field"

1

Obringer, John W., Tara E. Nolan, Brandon Horne, and Brian Kelchner. Mutagenic Potential of Direct Current Magnetic Fields. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada329411.

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Chance, M. S., J. M. Greene, and T. H. Jensen. The field line topology of a uniform magnetic field superposed on the field of a distributed ring current. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5523618.

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Romanov, Gennady, and Vladimir Kashikhin. Simulation of RF Cavity Dark Current in Presence of Helical Magnetic Field. Office of Scientific and Technical Information (OSTI), 2010. http://dx.doi.org/10.2172/992658.

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Ottinger, P. F., G. Cooperstein, J. W. Schumer, and S. B. Swanekamp. Self-Magnetic Field Effects on Electron Emission as the Critical Current is Approached. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/1185204.

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Ottinger, P. F., G. Cooperstein, J. W. Schumer, and S. B. Swanekamp. Self-Magnetic Field Effects on Electron Emission as the Critical Current is Approached. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada390441.

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Walstrom, Peter Lowell. Algorithms for Computing the Magnetic Field, Vector Potential, and Field Derivatives for Circular Current Loops in Cylindrical Coordinates. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1377379.

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Nikolic, L. Modelling the magnetic field of the solar corona with potential-field source-surface and Schatten current sheet models. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/300826.

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Walstrom, Peter Lowell. Algorithms for Computing the Magnetic Field, Vector Potential, and Field Derivatives for a Thin Solenoid with Uniform Current Density. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1374295.

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Willis, J. O., T. G. Holesinger, J. Y. Coulter, and M. P. Maley. Magnetic field and field orientation dependence of the critical current density in Bi-2212 round wires and other HTS conductors. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/378899.

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Raitses, Y., Smirnov A., and N. J. Fisch. Comment on "Effects of Magnetic Field Gradient on Ion Beam Current in Cylindrical Hall Ion Source. Office of Scientific and Technical Information (OSTI), 2008. http://dx.doi.org/10.2172/938977.

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