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Magnetic shielding is an effective means to reduce low-frequency magnetic fields emitted from power cables and busbars. However, shielding against unbalanced currents has not been addressed well. This paper introduces equivalent magnetic dipoles for discussing magnetic shielding under a monopole current source. It is found that shielding is achieved by the cancellation of magnetic fields from both...
Two modes of magnetic fields were applied in the Cr6+ removal sludge reactors containing two predominated strains—Bacillus sp. and Brevibacillus sp., respectively. The magnetic field mode I* of 0–4.5 or 0–14 mT between pieces was obtained by setting the magnetic pieces with the surface magnetic density of 0–6 or 0–20 mT into the reactor, and the magnetic field mode II* of 6, 20, or 40 mT on the return...
This paper addresses the magnetic field and induced current associated with a cylindrical shell loop under the excitation of an unbalance current source. An equivalent circuit theory is introduced to describe the coupling effect when the cylindrical shell loop is formed. Close-form expressions of the circuit component parameters are derived, as well as the induced current and magnetic field. An experimental...
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