Conferences related to Permeability

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2011 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

The Conference focuses on all aspects of instrumentation and measurement science and technology research, development and applications. The list of program topics includes but is not limited to MEASUREMENT SCIENCE & EDUCATION, MEASUREMENT SYSTEMS, MEASUREMENT -DATA ACQUISITION, MEASUREMENTS OF PHYSICAL QUANTITIES, and MEASUREMENT APPLICATIONS.



Periodicals related to Permeability

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Antennas and Propagation, IEEE Transactions on

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.


Geoscience 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.



Most published Xplore authors for Permeability

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Xplore Articles related to Permeability

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Infinitely many formulations using the magnetic vector potential with the Coulomb gauge for 3D field calculations

T. Morisue IEEE Transactions on Magnetics, 1990

Infinitely many formulations using the magnetic vector potential are presented for the 3-D magnetostatic field problem which satisfy the Coulomb gauge and yield the same unique solution. The term `infinitely-many' stems from the arbitrary nature of one parameter. Several of the formulations are compared numerically for a test problem. Further, the energy functionals corresponding to the formulations are presented for ...


Broadband Ferrite Microwave Isolator

P. H. Vartanian; W. P. Ayres; J. L. Melchor IRE Transactions on Microwave Theory and Techniques, 1956

A new type broadband unidirectional transmission line has been built utilizing the difference in energy distribution between two counter-rotating circularly polarized waves in a circular waveguide containing a ferrite. This principle of isolation is different from those which have been used previously. A large difference is observed in the energy distribution of two counter-rotating TE11 modes in a ferrite loaded ...


A modeling-based factor extraction method for determining spatial heterogeneity of Ga-68 EDTA kinetics in brain tumor

Y. Zhou; S. C. Huang; T. Cloughesy; C. K. Hoh; K. Black 1996 IEEE Nuclear Science Symposium. Conference Record, 1996

The ROI method used in a Ga-68 EDTA PET dynamic study for quantitative determination of brain tumor (blood brain barrier) BBB permeability assumes that the tumor is homogeneous in terms of Ga-68 EDTA kinetics, even though it is known to be highly heterogeneous. It is desirable to examine regions of different kinetics separately. In this study, we have developed an ...


Approximations for the Demagnetizing Factors of Hollow Cylinders Represented by Confocal Hollow Prolate Spheroids

R. F. Elfant IRE Transactions on Electronic Computers, 1962

First Page of the Article ![](/xploreAssets/images/absImages/05219464.png)


BEM calculation for magnetic shielding with steel sheets

Xinshan Ma; A. Wexler IEEE Transactions on Magnetics, 1985

The Boundary Element Method (BEM) is adapted to the solution of two- dimensional and axisymmetrical nonlinear shielding problems. The high vector- field accuracy attainable permits studies of extremely uniform nuclear magnetic resonance (NMR) fields to be made as well as less demanding shielding calculations. A technique is described in which nonlinearities are replaced by virtual sources in an explicit iteration ...


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Educational Resources on Permeability

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eLearning

Infinitely many formulations using the magnetic vector potential with the Coulomb gauge for 3D field calculations

T. Morisue IEEE Transactions on Magnetics, 1990

Infinitely many formulations using the magnetic vector potential are presented for the 3-D magnetostatic field problem which satisfy the Coulomb gauge and yield the same unique solution. The term `infinitely-many' stems from the arbitrary nature of one parameter. Several of the formulations are compared numerically for a test problem. Further, the energy functionals corresponding to the formulations are presented for ...


Broadband Ferrite Microwave Isolator

P. H. Vartanian; W. P. Ayres; J. L. Melchor IRE Transactions on Microwave Theory and Techniques, 1956

A new type broadband unidirectional transmission line has been built utilizing the difference in energy distribution between two counter-rotating circularly polarized waves in a circular waveguide containing a ferrite. This principle of isolation is different from those which have been used previously. A large difference is observed in the energy distribution of two counter-rotating TE11 modes in a ferrite loaded ...


A modeling-based factor extraction method for determining spatial heterogeneity of Ga-68 EDTA kinetics in brain tumor

Y. Zhou; S. C. Huang; T. Cloughesy; C. K. Hoh; K. Black 1996 IEEE Nuclear Science Symposium. Conference Record, 1996

The ROI method used in a Ga-68 EDTA PET dynamic study for quantitative determination of brain tumor (blood brain barrier) BBB permeability assumes that the tumor is homogeneous in terms of Ga-68 EDTA kinetics, even though it is known to be highly heterogeneous. It is desirable to examine regions of different kinetics separately. In this study, we have developed an ...


Approximations for the Demagnetizing Factors of Hollow Cylinders Represented by Confocal Hollow Prolate Spheroids

R. F. Elfant IRE Transactions on Electronic Computers, 1962

First Page of the Article ![](/xploreAssets/images/absImages/05219464.png)


BEM calculation for magnetic shielding with steel sheets

Xinshan Ma; A. Wexler IEEE Transactions on Magnetics, 1985

The Boundary Element Method (BEM) is adapted to the solution of two- dimensional and axisymmetrical nonlinear shielding problems. The high vector- field accuracy attainable permits studies of extremely uniform nuclear magnetic resonance (NMR) fields to be made as well as less demanding shielding calculations. A technique is described in which nonlinearities are replaced by virtual sources in an explicit iteration ...


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IEEE.tv Videos

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IEEE-USA E-Books

  • Tensor Permeability in a Magnetic Insulator

    This chapter contains sections titled: Introduction Tensor Permeability Damping Scalar Permeabilities Effective Permeability and Gyrotropy Kittel Line Low-Field Losses in Unsaturated Magnetic Insulator Magnetic Bias Points Above and Below the Kittel Line Spinwave Manifold Magnetization Values of Various Ferrites The Origin of the Uniform Linewidth in Magnetic Insulators

  • References

    The network economy presents itself in the transactions of electronic commerce, finance, business, and communications. The network economy is also a social condition of discontinuity, indefinite limits, and in-between spaces. In Cornucopia Limited, Richard Coyne uses the liminality of design -- its uneasy position between creativity and commerce -- to explore the network economy. He argues that design, with its open-ended and transgressive explorations, provides a new way to think about the world of commerce; design's inter-territorial precinct, its in-between condition, offers a way to frame the problems of the Internet economy -- for profit vs. for free, private vs. public, security vs. open access, defense vs. permeability.Design, says Coyne, has a natural affinity with the edge condition and the position between polar opposites. Edgy design starts with an idea, brings to mind its opposite, and then works with what emerges from the friction between the two. The designer of a Web portal, for example, might take on the problem of security by focusing on the limits of permeability. Design is edgy, and risky, argues Coyne, in the same way that breaches in network security are risky. In Cornucopia Limited he examines the threshold between conditions exemplified by the boundary between design and commerce. Coyne uses five metaphors of design to develop his argument: the household (in economics, historically opposed to the market), with its relationship to the street mediated by various portals; the machine, rampant and glitchy; the game, competitive but simulated; the gift, precursor to commerce; and the threshold. The threshold condition, Coyne says, is the site of edgy design and a portal into the new. The threshold, he argues, provides the most potent metaphor for u nderstanding the liminal dwellers of the network economy.

  • Index

    The network economy presents itself in the transactions of electronic commerce, finance, business, and communications. The network economy is also a social condition of discontinuity, indefinite limits, and in-between spaces. In Cornucopia Limited, Richard Coyne uses the liminality of design -- its uneasy position between creativity and commerce -- to explore the network economy. He argues that design, with its open-ended and transgressive explorations, provides a new way to think about the world of commerce; design's inter-territorial precinct, its in-between condition, offers a way to frame the problems of the Internet economy -- for profit vs. for free, private vs. public, security vs. open access, defense vs. permeability.Design, says Coyne, has a natural affinity with the edge condition and the position between polar opposites. Edgy design starts with an idea, brings to mind its opposite, and then works with what emerges from the friction between the two. The designer of a Web portal, for example, might take on the problem of security by focusing on the limits of permeability. Design is edgy, and risky, argues Coyne, in the same way that breaches in network security are risky. In Cornucopia Limited he examines the threshold between conditions exemplified by the boundary between design and commerce. Coyne uses five metaphors of design to develop his argument: the household (in economics, historically opposed to the market), with its relationship to the street mediated by various portals; the machine, rampant and glitchy; the game, competitive but simulated; the gift, precursor to commerce; and the threshold. The threshold condition, Coyne says, is the site of edgy design and a portal into the new. The threshold, he argues, provides the most potent metaphor for u nderstanding the liminal dwellers of the network economy.

  • Fluid Processes in Deep Crustal Fault Zones

    Fluid as a C-O-H dominated phase is widespread, but not ubiquitous, in the Earth's crust. The presence or absence of fluid is in large part a function of thermal history, at least up to the onset of melting. Rocks containing relatively low-temperature assemblages that are subject to further heating release fluid and so are commonly saturated, while rocks undergoing cooling resorb fluid into hydrous minerals and so are dry. Fluid may be introduced from external sources during faulting or magmatic activity, and the degree to which it persists depends on the interplay between injection rates and reaction rates. Where fluids do occur in the crust, fluxes are generally low, so that many aspects of fluid chemistry are dictated by saturation with rock- forming minerals. These mineralogical controls on fluid chemistry and activities of volatile species further affect the rheology of the crust by determining whether or not deformation can be fluxed by fluid processes. It is argued that rocks undergoing progressive metamorphism are wet and experience widespread deformation, while rocks that are cooling are strong and deformation is localized into zones, particularly during times of fluid infiltration. The transition between brittle and ductile behavior may therefore reflect changes in the availability of water rather than changes in temperature. Faults themselves are important loci of fluid flow, but it is often difficult to identify the sources of fluid, because geochemical tracers are mainly reset in a rock-dominated environment. Nevertheless, it is unlikely that faults are commonly effective drains of fluid being released by prograde metamorphism, because the very low permeability of such rocks (inferred from evidence for strong overpressuring) means that fluid cannot easily drain into fractures, even where a strong gradient in hydraulic head exists.

  • 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.

  • Static Magnetic Fields

    This chapter contains sections titled: Magnetic Force Magnetostatics in Free Space Magnetic Vector Potential The Biot-Savart Law Historical Conclusions Atomic Magnetism Magnetization Equivalent Surface Current Density Equivalent Magnetic Monopole Charge Density Magnetic Field Intensity and Permeability Ferromagnetism Boundary Conditions for Magnetic Fields Inductance and Inductors Torque and Energy

  • Deformation in the Presence of Fluids and Mineral Reactions

    Natural and experimental deformation of fault rocks show that fluid flow and mineral reactions are linked to fracturing in a nonlinear feedback relationship that potentially affects the displacement and stress histories of large faults. These interactions spawn instabilities that are expressed as episodic seismic events involving cataclasis, which alternate with slow, aseismic deformation involving pressure-solution creep, as well as healing and sealing by fluid-assisted mass transfer. This chapter focuses on the timescale of these processes during the earthquake cycle, with special emphasis on the evolution of rheological and transport properties of fault rock during the interseismic period. Fracturing weakens faults dramatically by enhancing the kinetics of pressure-solution creep and of mineral reactions. Therefore, during the postseismic period and initial part of the interseismic period, weakening is faster than fault strengthening by healing and sealing of fractures. During the interseismic period, mass transfer associated with fluid-assisted chemical reactions smoothes asperities on fault surfaces, heals fractures and enhances the formation of a foliation parallel to the fault plane, and decreases permeability. If advective fluid inflow is significant, this can increase pore-fluid pressure and reduce effective shear strength, at least locally within the fault. In the long term, however, the combined effect of fracturing, pressure-solution creep, and sealing is to restore the rheological and transport properties of the fault during the interseismic period, setting the stage for renewed stress build-up and seismicity. We demonstrate the salient characteristics of fluid-assisted fault weakening and strengthening with a one-dimensional model of an idealized fault zone undergoing simple shear at constant velocity. The model shows that the kinetics of the weakening a nd strengthening processes determine the relative rates of shear stress decrease and increase during the interseismic period. The kinetics of dissolution precipitation and mineral reactions are therefore expected to exert an important control on the recurrence time of earthquakes.

  • Basics of Electric Energy System Theory

    This chapter contains sections titled: Introduction Concepts of Power in Alternating Current Systems Three-Phase 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 Salient-Pole Machines Round or Smooth Air-Gap Machines Machine-Type Classification P-Pole Machines Power System Representation Problems

  • Fabrication of UHF Circulators Using Irregular Hexagonal Gyromagnetic Resonators

    This chapter contains sections titled: Introduction Wave Impedance and Wavenumber in UHF Gyromagnetic Circuits Gyromagnetic Space of Above-Resonance Circulators Approximate Relationships of Permeability Tensor H 0/M 0 Space The Kittel Line Temperature Stability of Kittel Line Mode Charts of UHF Gyromagnetic Irregular Hexagonal Planar Resonator Radial Magnetic Walls Magnetic Variables of Gyromagnetic Resonators Complex Gyrator Circuit of UHF Circulators Real Part Condition Quality Factor of UHF Circulators

  • Pulsed Voltage and Current Measurements

    Pulse voltage measurement techniques include crest voltmeters, voltage dividers, capacitive probes, electro???optical transducers, and reflection attenuators. Spark gaps can be used for the measurement of crest values of voltage pulses from 1 kV to 2.5 MV. Good irradiation and short gap spacing are the key requirements of spark gaps for measurement of crest voltages of nanosecond pulses. Because spark gaps with small gap spacing can handle only small voltages of not more than tens of kilovolts, they have to be used in conjunction with calibrated voltage dividers for measurement of very high voltages. Pulsed currents can be monitored with resistive current shunts, Rogowski coils, B???dot probes, current transformers, and magneto???optic devices. The increase in the magnetic permeability improves the sensitivity and hence extends its usefulness for the measurement of low currents. Current transformers, used to measure alternating currents on high???voltage power transmission lines, need a careful insulation design.



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