Results 201 to 210 of about 8,528 (252)

Transient electromagnetic response of a permeable nonuniformly conducting sphere

Journal of Applied Physics, 1975
Quasistatic response of a nonuniformly conducting and magnetically permeable sphere to a step pulse is obtained. the effect of conductivity distribution pattern and permeability of the sphere on the transient response is examined in detail. The results show that the introduction of conductivity inhomogeneity has considerable effect on the observed ...
Saurabh K. Verma, Madhu S. Joshi
openaire   +1 more source

Negative-permeability electromagnetically induced transparent and magnetically active metamaterials

Physical Review B, 2010
tions, but currently their performance is limited by the occurrence of losses—particularly radiation losses, which dominate over their dissipative counterparts even in the optical regime. Here, a metamaterial configuration is conceived that judiciously generalizes the traditional electromagnetically induced transparency EIT scheme—by which radiation ...
Tsakmakidis, KL, Wartak, MS, Cook, JJH, Hamm, JM, Hess, O   +4 more
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Analytical Mode III electromagnetic permeable cracks in magnetoelectroelastic materials

Computers & Structures, 2011
Fracture mechanism is pertinent to minimize the catastrophic failures and optimize the structural design. An exact treatment on the electromagnetic permeable crack problems in a magnetoelectroelastic medium is presented by establishing a Hamiltonian system in terms of the symplectic eigenfunctions. The coefficients of the series are determined from the
Z.H. Zhou, X.S. Xu, A.Y.T. Leung
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Broadband electromagnetic induction response form conducting and permeable spheroids

SPIE Proceedings, 2001
Broadband electromagnetic induction (EMI) methods are promising in the detection and discrimination of subsurface metallic targets. We compute EMI responses from conducting and permeable spheroids by using a field expansion method which is based on the separation of variables in spheroidal coordinates. In addition to an exact formulation which utilizes
Chi-On Ao, Henning Braunisch, Kevin O'Neill, Jin A. Kong, Leung Tsang, Joel T. Johnson   +5 more
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Electromagnetic transient response of rotationally symmetric permeable conducting objects

1988 IEEE AP-S. International Symposium, Antennas and Propagation, 2003
Low-frequency transient response is often used to detect or identify buried objects. At sufficiently low frequencies, the signal penetration in the ground is high and the air-earth interface has a negligible effect on the return response. The use of an exciting current loop also minimizes the ground conductivity effect.
A. Sebak, L. Shafai, Y. Das
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Electromagnetic-heating enhancement of source rock permeability for high recovery

Fuel, 2021
Abstract Source rock shales have permeability in the nano-Darcy range and require drilling long horizontal wells and extensive hydraulic fracturing to commercially produce hydrocarbons. Recently, an electromagnetic (EM) thermal method was proposed as a primary, or secondary, stimulation method to produce light hydrocarbons from extremely tight ...
Jin-Hong Chen, Stacey M. Althaus, Hui-Hai Liu, Jilin Zhang, Gary Eppler, Jewel C. Duncan, Qiushi Sun   +6 more
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Electromagnetic—acoustic evaluation of the permeability of porous media

Acoustical Physics, 2001
The generation of ultrasound in a porous water-saturated medium subjected to rapid electromagnetic heating is considered. The irradiation provides the Joule heating of narrow and electrically high resistive pore throats, which interconnect cavities within the medium and, consequently, determine the permeability of the medium.
Davydov, A. A., Lyamshev, L. M.
openaire   +2 more sources

An Electromagnetic Cantilever Generator with High-Permeability Magnetic Materials

2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS), 2018
This paper presented an electromagnetic cantilever generator (EMCG) of high energy density with high-permeability magnetic materials for harvesting ambient vibrational energy. We utilized a flexible cantilever connecting with a pair of magnets on the free end, and the coils with high-permeability magnetic materials are set right in front of the magnets.
Jiahong Lin, Huicong Liu, Tao Chen, Zhan Yang, Lining Sun, Yan Peng   +5 more
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Inversion of Multifrequency Electromagnetic Data to a Conductive and Permeable Sphere

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2001, 2001
We have developed an algorithm for inverting broadband electromagnetic (EM) data to determine its electrical conductivity, magnetic permeability, radius, and depth using a sphere model. The algorithm is based on traditional non-linear inverse methods with singular value decomposition.
Haoping Huang, I.J. Won
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Quasistatic transient electromagnetic response of a permeable nonuniformly conducting cylinder

Canadian Journal of Physics, 1976
The step-pulse response of a permeable and a radially nonuniformly conducting cylinder is obtained. Effects of the conductivity distribution pattern and the magnetic permeability on the transient response are examined in detail. It is found that: (i) the initial response (for t → 0) remains unaffected by both the inhomogeneity and the permeability of ...
S. K. Verma, M. S. Joshi
openaire   +1 more source