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Journal articles on the topic 'Direct current magnetic field'

Author: Grafiati

Published: 5 June 2025

Last updated: 24 June 2025

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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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Bogod, Yu A., Vit B. Krasovitskii, and E. T. Lemeshevskaya. "Direct-current skinning in inhomogeneous bismuth single crystals." Soviet Journal of Low Temperature Physics 11, no. 2 (1985): 84–86. https://doi.org/10.1063/10.0031247.

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It is shown that when single-crystal bismuth specimens that have a homogeneous defect distribution are in a transverse magnetic field the direct electric current is displaced to one of the boundary surfaces. The experimental results are compared with the calculated potential distribution.

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12

Yamazaki, Keita, Kazuo Kato, Koichiro Kobayashi, et al. "Environmental low-frequency magnetic field due to direct-current electric railcar." IEEJ Transactions on Fundamentals and Materials 120, no. 8-9 (2000): 835–44. http://dx.doi.org/10.1541/ieejfms1990.120.8-9_835.

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13

Onuke, Takashi, Yuichi Murai, Keiichi Satoh, and Masaaki Takahashi. "Magnetic field analysis of direct current machine including exterior leakage flux." IEEJ Transactions on Power and Energy 105, no. 5 (1985): 435–42. http://dx.doi.org/10.1541/ieejpes1972.105.435.

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14

TİRYAKİ, Hasan, Alper Sefa ÇAĞIŞLAR, Abdurrahim AKGÜNDOĞDU, and İlhan KOCAARSLAN. "Commutable Magnetic Field on Brushless Direct Current Motor for Electrical Vehicle." Uluslararası Muhendislik Arastirma ve Gelistirme Dergisi 8, no. 2 (2016): 37–45. http://dx.doi.org/10.29137/umagd.346153.

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15

Yamazaki, Keita, Kazuo Kato, Koichiro Kobayashi, et al. "Environmental low-frequency magnetic field due to direct-current electric railcars." Electrical Engineering in Japan 137, no. 3 (2001): 10–21. http://dx.doi.org/10.1002/eej.1090.

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16

Dmitriev, V. M., O. R. Prikhod’ko, E. V. Khristenko, A. V. Bondarenko, and M. A. Obolenskii. "Direct measurements of the critical current density in YBa2Cu3O7–x single crystals." Soviet Journal of Low Temperature Physics 16, no. 11 (1990): 839–40. https://doi.org/10.1063/10.0032741.

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The critical current densities Jc are measured directly in single crystals of HTS compounds YBa2Cu3O7–x near the superconducting transition temperature Tc. Extrapolation of the temperature dependence Jc(T) to low-temperature region (∼ 77 K) makes it possible to obtain very high values of the current density Jc (∼ 106 A/cm2) in these systems, which confirms the preliminary estimates of Jc obtained from the magnetic data. It is also shown that in HTS single crystals, the external magnetic field suppresses the critical current to a lesser extent than in polycrystals. Measurements of the critical current at various temperatures and magnetic fields have been used to estimate the second critical field in these compounds (Hc2 ∼ 35 T), whose order of magnitude is the same as the typical value for a wide range of HTS compounds.

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17

Li, Ying Hong, Bo Song, and Ning Wang. "Study on the Solidified Microstructures of AZ61 Magnesium Alloys under Electromagnetic Fields." Applied Mechanics and Materials 331 (July 2013): 421–26. http://dx.doi.org/10.4028/www.scientific.net/amm.331.421.

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The solidified microstructures of AZ61 magnesium alloy under different electromagnetic fields were investigated. Optical microstructure revealed that the solidified microstructure of AZ61 under single static magnetic field and combination of static magnetic field and alternating current (AC) consisted of basically equiaxed grains; when the alloy solidified under static magnetic field and direct current (DC), dendrite in solidified microstructure increases with certain orientation. The constituent phase at grain boundary consists of mainly magnesium matrix and continuous cellular compound under the static field, and the one consists of mainly magnesium matrix, cellular and spotted Mg-Al-Zn intermetallic compound under the action of static magnetic field and combination of static magnetic field and alternating current, the continuous cellular structure disappears thoroughly under static magnetic field and DC, compound in magnesium matrix distributes in discontinuous lamellar state.

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18

Bai, Yang, Ji Zhou, Zhenxing Yue, Zhilun Gui, and Longtu Li. "Magnetic properties of composite Y-type hexagonal ferrites in a direct current magnetic field." Journal of Applied Physics 98, no. 6 (2005): 063901. http://dx.doi.org/10.1063/1.2035878.

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19

Fang, Hong Wei, Si Yuan Fang, Jia Jia Cheng, and Jing Lian. "Investigation of Internal Faults for a Direct-Driven PMSG with Maxwell." Advanced Materials Research 760-762 (September 2013): 1364–68. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.1364.

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The electro-magnetic torque and current are analyzed for a static eccentric PMSG. The characteristics of air-gap magnetic field, EMF, current and electro-magnetic torque of the direct driven PMSG for wind power generation are investigated with Maxwell software various eccentric conditions. The related electrical magnetic torque and current variation are achieved, especially the harmonics for current and torque.

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20

Passath, Helfried, Gerald Leber, Peter Hamberger, and Florian Bachinger. "Direct current compensation – field experience under service conditions." Journal of Energy - Energija 63, no. 1-4 (2022): 3–12. http://dx.doi.org/10.37798/2014631-4158.

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Modern grain oriented core steel used in power transformers has a very high magnetic conductivity. This advanced material makes the transformer susceptible even for small direct current (DC) in the power grid. Already minor DC increases the no-load noise and no-load losses of the transformer considerably. This effect is known as half-cycle saturation. In order to overcome these parasitic DC an active compensation method called “DC compensation” (DCC) was recently developed by Siemens [1]. The question about the origin of the DC is not fully answered yet. However the following sources have been already identified: power electronics, renewable power generation (wind, solar), HVDC transmission lines and DC operated railroad or subway systems. The parasitic direct currents can flow over the power lines to ground or asymmetrically in the power line phases only. In this paper field data, a four-month DC load profile, of single-phase core type transformers, equipped with active DC compensation, are shown. The discussed unit, a bank of three single-phase autotransformers, is in service mainly exposed to DC flowing from the overhead lines through the windings to the common neutral. DC magnitude varies from 0.05 A to about 0.2 A DC per phase throughout the day. From factory tests we know that only 0.2 A DC causes a noise increase of 5.6 dB(A) compared to the noise level without any DC compensation. This might cause troubles at the substation when noise has to be below a guaranteed level. Data analysis of the field data shows that the DC throughout the day follows a clear profile with its highest level during midnight and lunch time. This might indicate a correlation to the load and / or switching operations in the grid to adjust to the actual needed load. However, the DC compensation equipment fully eliminates the direct flux in the core and thus the DC caused increase in noise.

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21

Tamao, Tsutomu. "Direct contribution of oblique field-aligned currents to ground magnetic fields." Journal of Geophysical Research 91, A1 (1986): 183. http://dx.doi.org/10.1029/ja091ia01p00183.

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22

Wang, Wei. "The Simulation of Lane Based on Magnetic Markers Guidance in Laboratory." Advanced Materials Research 823 (October 2013): 370–73. http://dx.doi.org/10.4028/www.scientific.net/amr.823.370.

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It is a high expense that the experiment of the testing vehicle based on magnetic markers carrying on outdoors. The distribution and movement of magnetic markers were simulated by direct-current electromagnet, using single chip microcomputer and power amplifier to control direct-current electromagnet. It cuts down the expense of experiment. This dissertation is focus on mainly the design of lane simulator. In the lane simulator, every 0.5m arranged a direct-current electromagnet. When the speed is 80km/h,the electrifying time of the direct-current electromagnet is 0.025s. And the electric voltage of the direct-current electromagnet is 24v, and the magnetic field intensity of the direct-current electromagnet is 12000Gs.

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23

Wang, Huipeng, Jialong Shi, Qiaogen Wang, Lihong Dong, and Huizhong Liu. "Surface Crack Detection of Aluminum Alloy Using Injected Direct Current-Magnetic Field Measurement Method." Sensors 25, no. 6 (2025): 1800. https://doi.org/10.3390/s25061800.

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Injected Direct Current-Magnetic Field Measurement (IDC-MFM) is a promising nondestructive technique for crack evaluation of aluminum alloy due to its high sensitivity to defect states. Finite element simulation and experiment were introduced in this research to reveal the relationship between the magnetic field and the crack size. The finite element simulation showed that the magnetic field at the defect increased with the currents, and the peak-to-peak value of the tangential component magnetic field Bx (ΔBxpp) correlated with both the width and depth of the crack very well. The high-sensitivity tunnel magnetoresistance probe was used for crack detection of aluminum alloy specimens with different crack widths and depths, and the results show that the relationship between the ΔBxpp and the crack was consistent with the simulation results, and ΔBxpp has a nonlinear positive correlation with crack width and a linear positive correlation with crack depth. The results of the present work show that IDC-MFM has high sensitivity in crack size detection and is a feasible solution for the quantitative evaluation of cracks in aluminum alloy.

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24

Kuznecov, K. B., G. A. Polunin, and A. P. Zakirova. "Development of theory of magnetic field assessment nearby a direct current catenary." Herald of the Ural State University of Railway Transport, no. 2 (2019): 94–99. http://dx.doi.org/10.20291/2079-0392-2019-2-94-99.

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25

Douqin, Ma, Song Yahu, Wu Qingjie, and Xie Jingpei. "The antiwear mechanism of W-20Cu composites in direct current magnetic field." Materials Research Express 5, no. 12 (2018): 126513. http://dx.doi.org/10.1088/2053-1591/aae171.

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26

Matlachov, Andrei N., Petr L. Volegov, Vadim S. Zotev, Michelle A. Espy, John C. Mosher, and Robert H. Kraus. "Using ultra-low field nuclear magnetic resonance for direct neural current measurements." International Congress Series 1300 (June 2007): 582–85. http://dx.doi.org/10.1016/j.ics.2007.01.022.

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27

Zhang, Yan Li, Ning Zhang, Ya Hua Kang, Xiu Ke Yan, and De Xin Xie. "Magnetic Field Analysis of a Complex Construction Transformer Using Direct Field-Circuit Coupling Method." Advanced Materials Research 614-615 (December 2012): 1230–33. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.1230.

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This paper deals with the main magnetic field distribution for a three-phase five-column disintegration transformer with the iron core disassembled into several parts owing to limited transport condition. The finite element method is employed to solve such a special configuration transformer, in which the direct field-circuit coupling formulation is derived and programmed by APDL programming language. The calculation results, such as the magnetic field distribution in transformer core, the exciting current magnitude and no-load loss are investigated. The optimum size of air gap between each separated iron core limbs is discussed.

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28

Gillon, Pascale. "Materials processing with high direct-current magnetic fields." JOM 47, no. 5 (1995): 34–37. http://dx.doi.org/10.1007/bf03221173.

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29

Eyni, Zahra, and Hakimeh Mohammadpour. "A spin current rectifier." International Journal of Modern Physics B 31, no. 30 (2017): 1750230. http://dx.doi.org/10.1142/s0217979217502307.

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Current modulation and rectification is an important subject of electronics as well as spintronics. In this paper, an efficient rectifying mesoscopic device is introduced. The device is a two terminal device on the 2D plane of electron gas. The lateral contacts are half-metal ferromagnetic with antiparallel magnetizations and the central channel region is taken as ferromagnetic or normal in the presence of an applied magnetic field. The device functionality is based on the modification of spin-current by tuning the strength of the magnetic field or equivalently by the exchange coupling of the channel to the substrate. The result is that the (spin-) current depends on the polarity of the bias voltage. Converting an alternating bias voltage to direct current is the main achievement of this model device with an additional profit of rectified spin-current. We analyze the results in terms of the spin-dependent barrier in the channel. Detecting the strength of the magnetic field by spin polarization is also suggested.

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30

Karpets, M., M. Rajnak, O. Ivankov, et al. "Small-Angle Neutron Scattering Study of Transformer Oil-Based Ferrofluids." Ukrainian Journal of Physics 65, no. 8 (2020): 729. http://dx.doi.org/10.15407/ujpe65.8.729.

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It is known that ferrofluids typically respond to magnetic fields and can be manipulated by such external fields. The particle assembly in magnetic nanofluids can be induced even by a direct current (dc) electric field. An experimental study of magnetic colloidal particles and their changes induced by an external electric field in a ferrofluid based on 2 transformer oils with different concentrations of nanoparticles is presented. By small-angle neutron scattering (SANS), we show the influence of the electric field intensity and the concentration on magnetic nanoparticle aggregates.

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31

Dobriyan, R., S. Vitolina, L. Lavrinovicha, and J. Dirba. "Theoretical and Experimental Research of Synchronous Reluctance Motor." Latvian Journal of Physics and Technical Sciences 54, no. 5 (2017): 38–47. http://dx.doi.org/10.1515/lpts-2017-0032.

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Abstract The paper presents the research on evaluation of accuracy of magnetic field calculations of synchronous reluctance motor in comparison with the results obtained in experiments. Magnetic field calculations are performed with the finite element method to determine values of the magnetic flux and electromagnetic torque according to the current value in motor stator and load angle between the rotor direct-axis and axis of stator magnetomotive force (MMF). Experimental values of magnetic flux and electromagnetic torque are obtained on motor with locked rotor while equivalent direct current is applied to the stator windings. The research shows that the results obtained from the magnetic field calculations coincide well with the experimental data.

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32

Moffett, Mark B., David L. Chesny, Jake M. Cole, Kaleb W. Hatfield, and Razvan Rusovici. "Bdot probe and Rogowski coil cross-calibration and sensor fusion in pulsed direct current capacitor discharges." Review of Scientific Instruments 93, no. 3 (2022): 034707. http://dx.doi.org/10.1063/5.0076741.

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Bdot probes and Rogowski coils are used in the measurement of transient magnetic fields and currents, respectively. They both share the mechanism of creating an induced electromotive force response via Faraday’s law, which scales linearly with the pulsed magnetic field. High power capacitor direct current (DC) discharge systems release a single pulse of current that is both very high and very fast (≲1 ms). To capture these transient data and characterize these systems, high current tolerant and fast response time sensors are required. While these measuring devices have been well studied and utilized for almost 100 years, a comprehensive and detailed description of the custom design, calibration, and sensor fusion application of these tools for use in various pulsed DC capacitor value discharges is largely missing in the literature. Using robust analytical calculations, finite element analyses, and empirical methods, we have developed a sensor fusion protocol for current and magnetic field probes (with relative errors of ±13% and ±15%, respectively) for use in any geometry of high speed pulsed DC current calibrated capacitor discharge systems. This paper comprehensively outlines the design and sensor fusion methodologies that allow for the deployment of in-house built Bdot probes and Rogowski coils to a wide range of pulsed DC systems and demonstrates their use in a characteristic plasma environment.

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33

Plakhtiev, A. M., G. A. Gaziev, N. A. Akbarova, and A. S. Rajapov. "Continuous current converters in the electrosphere." EPJ Web of Conferences 321 (2025): 01015. https://doi.org/10.1051/epjconf/202532101015.

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The article presents the structure of non-contact ferromagnetic devices for the continuous conversion of strong direct currents and the features of our proposed wide-profile magneto modulating non-contact DC current converter with an extended controllable range for various industrial enterprises, transport, agriculture, and water management. It is distinguished from known devices by several advantages: the ability to continuously control strong and small currents, compact size and low weight, relatively high accuracy and sensitivity, simple and technologically advanced design, and the capability to continuously measure large constant and alternating currents. The study examines the influence of external magnetic fields on the proposed current converter from adjacent busbars with currents flowing in the same and opposite directions, as well as from a single busbar. The results show that the magnetic field from busbars with counter-directed currents has a greater influence. The developed magneto modulation non-contact device for the continuous conversion of strong direct currents is intended for use in various automatic systems in water supply, electrolysis plants, rolling mills, electricity meters, and many other areas.

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34

Kaziev, A. V., D. G. Ageychenkov, A. V. Tumarkin, et al. "Ion current optimization in a magnetron with tunable magnetic field configuration." Journal of Physics: Conference Series 2064, no. 1 (2021): 012061. http://dx.doi.org/10.1088/1742-6596/2064/1/012061.

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Abstract The response of the ion current in the substrate region to the magnetic system configuration of a circular magnetron was studied during direct current sputtering of aluminum target. The unbalancing degree induced by changing of magnets’ positions was modelled with finite element methods. The ion saturation current in the substrate region showed more than twofold variation with unbalancing degree in the range 0.6–1.2. The dependence was non-monotonic, and the system was optimized to maximize the substrate ion current. The Langmuir probe diagnostics showed plasma density ~ 1016 m−3 in the optimized magnetic configuration.

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35

Trivedi, K., S. Tanguay, M. Matties, and R. Sacks. "Magnetically Tailored Arc and Glow Discharge Plasmas for Atomic Spectroscopy." Applied Spectroscopy 41, no. 5 (1987): 833–43. http://dx.doi.org/10.1366/0003702874448382.

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Three magnetic field-plasma configurations are used to study the interaction of external magnetic fields with analytically useful plasma devices. First, a magnetic field oscillating at 60 Hz and normal to the electric field in a 12-A direct current arc plasma is used to obtain an Ē×B̄ drift motion of the arc current channel. This causes a periodic vertical displacement of the channel. Second, a cw magnetic field is used to alter the structure and radiative properties of a demountable glow discharge lamp that uses a center-post cathode. The magnetic field axis is parallel to the cathode axis, and the lamp is operated in a pseudo-magnetron mode. Third, a damped, oscillatory magnetic field produced by discharging a capacitor through a coil is used to alter the radiative characteristics of several commercial hollow cathode lamps. The magnetic field is parallel to the cathode axis, and again the lamps operate in a pseudo-magnetron mode. In all three systems, the presence of the magnetic field drastically alters the radiative properties of the plasmas.

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36

Das, Umesh C. "Apparent resistivity curves in controlled‐source electromagnetic sounding directly reflecting true resistivities in a layered earth." GEOPHYSICS 60, no. 1 (1995): 53–60. http://dx.doi.org/10.1190/1.1443762.

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Conversion of the measured voltages in direct current resistivity sounding methods into apparent resistivity [Formula: see text] is a useful step since [Formula: see text] data provide information about the subsurface resistivity variations with depth. This resistivity information then helps select a model for inverting the sounding data. In the controlled‐source electromagnetic method (CSEM), conversion of the measured electric and magnetic fields into apparent resistivity values has not been popular. This attitude may be attributed to the difficulties in the inversion of the resistivity of a half‐space from the electromagnetic (EM) field components as well as to the nonunique nature of the inversion giving two resistivity values for a single measurement. Two measured components—the vertical magnetic field [Formula: see text] and the tangential electric field [Formula: see text] as a result of a vertical magnetic dipole source—are combined to derive an exact apparent resistivity in a way similar to that used in direct current resistivity methods. Conversion of the measured [Formula: see text] and [Formula: see text] field components into apparent resistivity is found to be simple and can be carried out on a programmable pocket calculator. Theoretical apparent resistivity curves for frequency‐domain electromagnetic sounding show features similar to magnetotelluric (MT) and direct current dipole‐dipole apparent resistivity curves.

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Vogt, G., A. Schrefl, R. Mitteregger, and D. Falkenhagen. "A Novel Field Generator for Magnetic Stimulation in Cell Culture Experiments." International Journal of Artificial Organs 20, no. 6 (1997): 352–56. http://dx.doi.org/10.1177/039139889702000609.

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A novel field generator specially designed to examine the influence of low frequency magnetic fields on specific cell material was constructed and characterized. The exposure unit described in this paper consists of a controller unit and three sets of coils. The field generator permits a precious definition of the revelant signal parameters and allows the superposition of alternating current (AC) and direct current (DC) magnetic fields. Critical system parameters were monitored continuously. The three sets of coils, each arranged in the Helmholtz Configuration were characterized. After data processing and visualization the results showed a constant and homogeneous field within the experimental area. The special coil design also allows their use in an incubator.

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Wu, Wei, Jikai Si, Haichao Feng, Zhiping Cheng, Yihua Hu, and Chun Gan. "Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor." Energies 12, no. 6 (2019): 1134. http://dx.doi.org/10.3390/en12061134.

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A two-degree-of-freedom direct-drive induction motor (2DoFDDIM), whose solid rotor is coated with a copper layer, is capable of linear, rotary, and helical motions and has widespread applications. For solid-rotor motors, the calculation and analysis of rotor total eddy current loss (TECL) are crucial in studying the factors causing such a loss and possible loss reduction methods. In this study, a new nonlinear analytical method considering the saturation of the rotor core is proposed to solve the fundamental magnetic field. The new method divides the time period into segments. The magnetic field distribution at any time is obtained using Maxwell equations. The eddy current losses in the copper layer and rotor core caused by the fundamental magnetic field are calculated. The surface eddy current losses in the copper layer and rotor core caused by harmonics are calculated using a 2D analytical method. TECL is determined by the sum of eddy current and surface eddy current losses. Coefficients are utilized to consider eddy, saturation, and end-region effects when calculating the rotor core TECL. The new method is verified using 3D FEM, and the results show the proposed method has higher accuracy than the original method. The errors of the rotor core and copper layer TECLs are less than 6% and 7.3%, respectively.

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Xu, Guangye, and Kazuhiko Iwai. "Micro-Scale Flow Excitation under Imposition of Uniform Magnetic Field and Electrical Current." Metals 12, no. 12 (2022): 2034. http://dx.doi.org/10.3390/met12122034.

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Mass transfer is often the rate-determining step for solid-liquid chemical reactions. Decreasing the concentration boundary layer thickness is essential to intensify the chemical reaction. Because the concentration boundary layer exists in the velocity boundary layer, forcing imposition on the concentration boundary layer by superimposing an electrical current and a magnetic field was proposed. Through this, flow can be directly excited in the concentration boundary layer. The previous results indicate that by superimposing a direct current and a gradient magnetic field, the development of the concentration boundary layer was suppressed because of a macro-scale flow excitation in the whole vessel. By superimposing the gradient magnetic field with a modulated current, the development of the concentration boundary layer was further suppressed. This is because of the macro-scale flow enhancement and the excitation of a micro-scale flow near the solid-liquid interface. However, the mechanism of the micro-scale flow excitation has not been clarified. To clarify this, a uniform magnetic field was superimposed with the direct current or the modulated current. By this means, only the micro-scale flow was excited near the anode surface. The results found that the non-uniform electromagnetic force distribution is the main reason for the micro-scale flow excitation.

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Giordano, James, Marom Bikson, Emily S. Kappenman, et al. "Mechanisms and Effects of Transcranial Direct Current Stimulation." Dose-Response 15, no. 1 (2017): 155932581668546. http://dx.doi.org/10.1177/1559325816685467.

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The US Air Force Office of Scientific Research convened a meeting of researchers in the fields of neuroscience, psychology, engineering, and medicine to discuss most pressing issues facing ongoing research in the field of transcranial direct current stimulation (tDCS) and related techniques. In this study, we present opinions prepared by participants of the meeting, focusing on the most promising areas of research, immediate and future goals for the field, and the potential for hormesis theory to inform tDCS research. Scientific, medical, and ethical considerations support the ongoing testing of tDCS in healthy and clinical populations, provided best protocols are used to maximize safety. Notwithstanding the need for ongoing research, promising applications include enhancing vigilance/attention in healthy volunteers, which can accelerate training and support learning. Commonly, tDCS is used as an adjunct to training/rehabilitation tasks with the goal of leftward shift in the learning/treatment effect curves. Although trials are encouraging, elucidating the basic mechanisms of tDCS will accelerate validation and adoption. To this end, biomarkers (eg, clinical neuroimaging and findings from animal models) can support hypotheses linking neurobiological mechanisms and behavioral effects. Dosage can be optimized using computational models of current flow and understanding dose–response. Both biomarkers and dosimetry should guide individualized interventions with the goal of reducing variability. Insights from other applied energy domains, including ionizing radiation, transcranial magnetic stimulation, and low-level laser (light) therapy, can be prudently leveraged.

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Brauchle, Felix, Florian Grimsmann, Otto von Kessel, and Kai Peter Birke. "Direct measurement of current distribution in lithium-ion cells by magnetic field imaging." Journal of Power Sources 507 (September 2021): 230292. http://dx.doi.org/10.1016/j.jpowsour.2021.230292.

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42

Zhang, H. S., and K. Komvopoulos. "Direct-current cathodic vacuum arc system with magnetic-field mechanism for plasma stabilization." Review of Scientific Instruments 79, no. 7 (2008): 073905. http://dx.doi.org/10.1063/1.2949128.

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Sun, J.-B., T.-M. Wang, Y.-S. Yu, et al. "Numerical simulation and fabrication for bimetal clad slab under direct current magnetic field." International Journal of Cast Metals Research 24, no. 3-4 (2011): 190–96. http://dx.doi.org/10.1179/136404611x13001912814068.

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Hahn, Seungyong, Kwanglok Kim, Kwangmin Kim, et al. "45.5-tesla direct-current magnetic field generated with a high-temperature superconducting magnet." Nature 570, no. 7762 (2019): 496–99. http://dx.doi.org/10.1038/s41586-019-1293-1.

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Levko, Dmitry, and Laxminarayan L. Raja. "Magnetized direct current microdischarge. II. Effect of magnetic field amplitude on the plasma." Journal of Applied Physics 121, no. 9 (2017): 093303. http://dx.doi.org/10.1063/1.4977755.

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TANAKA, Hiroyuki, and Haruhiko KOHNO. "102 Numerical analysis of a rising bubble under a direct-current magnetic field." Proceedings of Conference of Kyushu Branch 2015.68 (2015): 3–4. http://dx.doi.org/10.1299/jsmekyushu.2015.68.3.

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47

Prozorov, E. F., K. N. Ul’yanov, V. A. Fedorov, and Ya I. Londer. "Study of the direct current breakage process in an external nonuniform magnetic field." High Temperature 49, no. 5 (2011): 629–36. http://dx.doi.org/10.1134/s0018151x1105018x.

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CHEN, Hang, Jin-chuan JIE, Ying FU, Hong-jun MA, and Ting-ju LI. "Grain refinement of pure aluminum by direct current pulsed magnetic field and inoculation." Transactions of Nonferrous Metals Society of China 24, no. 5 (2014): 1295–300. http://dx.doi.org/10.1016/s1003-6326(14)63191-5.

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Dzhala, R. M., L. P. Dikmarova, and V. Yu Kornienko. "Effect of the terrestrial magnetic field on direct-current measurements in underground pipelines." Measurement Techniques 38, no. 7 (1995): 786–90. http://dx.doi.org/10.1007/bf02616265.

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Tan Xi, 谭曦, 刘军 Liu Jun, 殷建玲 Yin Jianling, and 余伟涛 Yu Weitao. "Magnetic Sensitivity Studies of Fiber Optic Gyroscope in Direct Current and Alternating Current Magnetic Fields." Chinese Journal of Lasers 39, no. 9 (2012): 0905006. http://dx.doi.org/10.3788/cjl201239.0905006.

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