Permeability
15,396 resources related to Permeability
Periodicals related to Permeability
Back to TopGeoscience and Remote Sensing, IEEE Transactions on
Theory, concepts, and techniques of science and engineering as applied to sensing the earth, oceans, atmosphere, and space; and the processing, interpretation, and dissemination of this information.
Magnetics, IEEE Transactions on
Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The Transactions publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.
Xplore Articles related to Permeability
Back to TopApplication of a conjugate gradient FFT method to scattering from thin planar material plates
T. J. Peters; J. L. Volakis IEEE Transactions on Antennas and Propagation, 1988
The backscatter cross section is calculated for thin material plates with finite electric permittivity, conductivity, and magnetic permeability illuminated by a plane wave. The plates are assumed to be planar with an arbitrary perimeter. The integral equations are formed and solved by a combined conjugate gradientfast Fourier transform (CGFFT) method. The CGFFT method was tested for several geometrics and materials ...
Anjali Sharma; Mohammed N. Afsar 2011 IEEE International Instrumentation and Measurement Technology Conference, 2011
This paper presents complex permittivity and permeability measurements of ironloaded materials. These materials are found to be useful as microwave absorbers for application in electromagnetic interference reduction. A transmission reflection based waveguide measurement technique has been used for accurately characterizing the materials in the 2 to 40 GHz microwave frequency range. The precise frequency dependence of the constitutive material properties ...
3D modelling of a nonlinear anisotropic lamination
J. Bastos; G. Quichaud IEEE Transactions on Magnetics, 1985
We propose, in this paper, a 3D magnetic field calculation method, when there are ironair laminations in the domain. This model is applied to a variational finite element method, using a scalar potential. The iron nonlinearity is considered and a NewtonRaphson method for this 3D anisotropic problem is developed.
Optimum design of ironcore electromagnets
P. Di Barba; P. Navarra; A. Savini; R. Sikora IEEE Transactions on Magnetics, 1990
General problems of optimization of ironcore electromagnets are considered. The use of analytical and numerical methods are compared. Various models of electromagnets are examined, taking into account the magnetization curve of iron, operating conditions, the construction of coils, etc. The possibility of tackling the automatic design of ironcore electromagnets with cylindrical symmetry is demonstrated. The optimization procedure can also be ...
Efficient Computational Strategies for Solving Global Optimization Problems
Muhammad Sahimi; Hossein Hamzehpour Computing in Science & Engineering, 2010
Global optimization's active research community continues to pursue increasingly efficient computational strategies for addressing largescale optimization problems.
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Educational Resources on Permeability
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Application of a conjugate gradient FFT method to scattering from thin planar material plates
T. J. Peters; J. L. Volakis IEEE Transactions on Antennas and Propagation, 1988
The backscatter cross section is calculated for thin material plates with finite electric permittivity, conductivity, and magnetic permeability illuminated by a plane wave. The plates are assumed to be planar with an arbitrary perimeter. The integral equations are formed and solved by a combined conjugate gradientfast Fourier transform (CGFFT) method. The CGFFT method was tested for several geometrics and materials ...
Anjali Sharma; Mohammed N. Afsar 2011 IEEE International Instrumentation and Measurement Technology Conference, 2011
This paper presents complex permittivity and permeability measurements of ironloaded materials. These materials are found to be useful as microwave absorbers for application in electromagnetic interference reduction. A transmission reflection based waveguide measurement technique has been used for accurately characterizing the materials in the 2 to 40 GHz microwave frequency range. The precise frequency dependence of the constitutive material properties ...
3D modelling of a nonlinear anisotropic lamination
J. Bastos; G. Quichaud IEEE Transactions on Magnetics, 1985
We propose, in this paper, a 3D magnetic field calculation method, when there are ironair laminations in the domain. This model is applied to a variational finite element method, using a scalar potential. The iron nonlinearity is considered and a NewtonRaphson method for this 3D anisotropic problem is developed.
Optimum design of ironcore electromagnets
P. Di Barba; P. Navarra; A. Savini; R. Sikora IEEE Transactions on Magnetics, 1990
General problems of optimization of ironcore electromagnets are considered. The use of analytical and numerical methods are compared. Various models of electromagnets are examined, taking into account the magnetization curve of iron, operating conditions, the construction of coils, etc. The possibility of tackling the automatic design of ironcore electromagnets with cylindrical symmetry is demonstrated. The optimization procedure can also be ...
Efficient Computational Strategies for Solving Global Optimization Problems
Muhammad Sahimi; Hossein Hamzehpour Computing in Science & Engineering, 2010
Global optimization's active research community continues to pursue increasingly efficient computational strategies for addressing largescale optimization problems.
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IEEEUSA EBooks

Principles of Electromagnetism and Electromechanical Energy Conversion
This chapter contains sections titled: Introduction MagneticField Laws Permeability and MagneticField Intensity Magnetic Circuits Flux Linkages, Induced Voltages, Inductance, and Energy Hysteresis Loop EddyCurrent and Core Losses Energy Flow Approach Field Energy Multiply Excited Systems Reluctance Motors Doubly Excited Systems SalientPole Machines Round or Smooth AirGap Machines MachineType Classification _P_Pole Machines This chapter contains sections titled: Problems

Study of magnetic fields provides an explanation of how magnetic actuators and sensors work. This chapter presents the basic principles of electromagnetics including magnetic fields. In reviewing electromagnetic theory, the chapter introduces various parameters and their symbols. Magnetic fields are vectors, and thus it is useful to review mathematical operations involving vectors. Separate sections of the chapter are devoted to Ampere's law, Faraday's law and Maxwell's equations. Magnetic materials with high relative permeability are said to be magnetically soft. The reason for the high permeability of certain materials is that they contain many magnetic domains. Potentials are useful in electrical engineering; the most common example of potential is voltage.

This chapter contains sections titled: Magnetic Fields Biot and Savart's Law The Solenoid Faraday's Law and the Induction Field Inductance The Energy Stored in an Inductance Magnetic Field Energy in Space The Magnetic Circuit A Magnetic Circuit with a Gap Small Inductors Self and Mutual Inductance Transformer Action Hysteresis and Permeability Eddy Currents The Transport of Electrical Energy Poynting's Vector Transmission Lines Introduction Transmission Line Operations Transmission Line Field Patterns Interfering Fields

Basics of Electric Energy System Theory
This chapter contains sections titled: Introduction Concepts of Power in Alternating Current Systems ThreePhase Systems The Per Unit System Electromagnetism and Electromechanical Energy Conversion Permeability and Magnetic Field Intensity Flux Linkages, Induced Voltages, Inductance, and Energy Hysteresis Loop Eddy Current and Core Losses Energy Flow Approach Multiply Excited Systems Doubly Excited Systems SalientPole Machines Round or Smooth AirGap Machines MachineType Classification PPole Machines Power System Representation Problems

Magnetic Materials and Planar Transmission Lines
This chapter begins with a physical investigation of the behavior of magnetic materials before delving into some particular applications of the magnetic effects. It presents the physics of magnetic materials and of magnetized magnetic materials. When a material is magnetized and RF magnetic fields are in the plane perpendicular to the magnetization the effective relative permeability can be large and can even be negative. The relative permeability can even be different depending on the direction of magnetic fields. This effect is exploited in realizing nonreciprocal components such as circulators and isolators. Magnetically biased ferrites and garnets, both of which are ferrimagnetic materials, have relatively low loss, and substrates and thin films of certain ferrites and garnets are used as substrates for planar transmission lines. The chapter also describes the frequency selective limiter (FSL) and transmission lines using metaconductors.

Complex Gyrator Circuit of Negative Permeability Tracking and Semitracking Circulators
This chapter contains sections titled: Introduction Negative Permeability Gyromagnetic Resonator Impedance Poles of Very Strongly Magnetized Junction Circulation Solution Using Nondegenerate Resonator Modes Standing Wave Solution of Circulator Using Nondegenerate Resonator Modes Negative Permeability Tracking Solution Frequency Response Complex Gyrator Circuit of 100% Circulator Composite Gyromagnetic Resonator

This chapter contains sections titled: Body fluid permeability Electric loss and dielectric constant Tissue and blood reactions Forming and repair

Improved magnetic mirror models (IM3) for mono and dual coils with a finite width and infinite permeability are explained in this chapter [47]. By introducing a mirror current, which is located at the same distance from a source current but with a smaller magnitude than the source current, the magnetic flux density of the mono and dual coils can be determined in a closed form. The ratio of the mirror current and source current is identified as a function of the width of the core plate and the distance between the source current and core plate, as rigorously derived from the finite???element method (FEM) simulations. Applying the proposed IM3 to the mono and dual coils used for wireless electric vehicles, the magnetic flux density over an open core plate is analyzed and its maximum points on the plate are found, which is crucial in the design of the coils to avoid local magnetic saturation. Furthermore, the magnetic flux density when a pick???up core plate is positioned over a primary core plate is also analyzed by introducing successive mirror currents. The proposed magnetic mirror models are extensively verified by experiments as well as site tests, showing quite promising practical usefulness.This chapter is based on the paper by W.Y. Lee, J. Huh, S.Y. Choi, X.V. Thai, J.H. Kim, E.A. Al???Ammar, M.A. El???Kady, and C.T. Rim, ???Finite???width magnetic mirror models of mono and dual coils for wireless electric vehicles,??? IEEE Trans. on Power Electronics, vol. 28, no. 3, pp. 1413???1428, March 2013.

Categorization of Natural Materials and Metamaterials
An electromagnetic material is categorized by its constitutional parameters, permittivity ¿¿ and permeability ¿¿. A double¿¿?positive (DPS) material is defined as a right¿¿?handed (RH) material. The phase constant of wave propagation within the RH material exhibits a positive value. A double¿¿?negative (DNG) material is defined as a left¿¿?handed (LH) material. The phase constant of wave propagation within the LH material exhibits a negative value. A DPS material is a material found easily in nature and called a natural material, while a DNG, mu¿¿?negative (MNG) material is an artificial material and called a metamaterial (MTM). Most antennas are made of natural materials. This chapter presents the categorization of natural and metamaterial antennas in reference to ¿¿, the propagation phase constant of the current flowing along a fed element. It explains categorization using examples and shows spiral antennas, a spiral with a cavity and a spiral antenna above an electromagnetic band gap (EBG) reflector.

This chapter contains sections titled: Magnetic Fields in Free Space: Vector Potential Fields Generated by Linear Currents Fields Generated by Surface Currents Fields at Large Distances from the Sources Scalar Potential in Vacuum Magnetic Materials Permanent Magnets The Limit of Infinite Permeability TwoDimensional Fields in the Plane Axisymmetric Geometries Numerical Methods: Integral Equations Numerical Methods: Finite Elements Nonlinear Materials Strong Magnetic Fields and ForceFree Currents