Author: Ki Ha Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 180
Book Description
Electromagnetic Scattering by Two-dimensional Inhomogeneity Due to an Oscillating Magnetic Dipole
Electromagnetic Scattering by a Two-dimensional Inhomogeneity Due to an Oscillating Magnetic Dipole
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A numerical method of computing the electromagnetic response of two-dimensional earth models to an oscillating magnetic dipole is presented. The generalized electromagnetic variational integral is reduced to a sum of two-dimensional variational integrals by Fourier transformation. Discretization of each two-dimensional integral is carried out in terms of the secondary electric fields by using the finite element method. Following the variational principle, each harmonic integral is reduced to a set of simultaneous equations. From each set of electric field solutions obtained by solving the simultaneous equations, the secondary magnetic fields are computed numerically. After inversely Fourier transforming the secondary electric and magnetic fields, the total fields are finally obtained by adding the analytically calculated primary fields. Because of the systematically implied continuity of the electric field in the finite element solution, the given discontinuous conductivity is modified to a continuous one across internal boundaries. The quality of the solution for the horizontal magnetic dipole is found to be relatively poor compared to that for the vertical magnetic dipole. It is not possible to perform an absolute numerical check of the solution due to the lack of another independently developed solution against which it can be checked. As an alternative the solutions for two-dimensional models were compared to those for some elongated three-dimensional models whose cross sections correspond to the two-dimensional models. 23 figures, 1 table.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A numerical method of computing the electromagnetic response of two-dimensional earth models to an oscillating magnetic dipole is presented. The generalized electromagnetic variational integral is reduced to a sum of two-dimensional variational integrals by Fourier transformation. Discretization of each two-dimensional integral is carried out in terms of the secondary electric fields by using the finite element method. Following the variational principle, each harmonic integral is reduced to a set of simultaneous equations. From each set of electric field solutions obtained by solving the simultaneous equations, the secondary magnetic fields are computed numerically. After inversely Fourier transforming the secondary electric and magnetic fields, the total fields are finally obtained by adding the analytically calculated primary fields. Because of the systematically implied continuity of the electric field in the finite element solution, the given discontinuous conductivity is modified to a continuous one across internal boundaries. The quality of the solution for the horizontal magnetic dipole is found to be relatively poor compared to that for the vertical magnetic dipole. It is not possible to perform an absolute numerical check of the solution due to the lack of another independently developed solution against which it can be checked. As an alternative the solutions for two-dimensional models were compared to those for some elongated three-dimensional models whose cross sections correspond to the two-dimensional models. 23 figures, 1 table.
Electromagnetic Scattering by Two-dimensional Inhomogeneities in the Earth
Author: Gerald Wayne Hohmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Scientific and Technical Aerospace Reports
Energy Research Abstracts
Geophysics Field Measurements
Author:
Publisher: Academic Press
ISBN: 0080860125
Category : Science
Languages : en
Pages : 637
Book Description
Geophysics Field Measurements
Publisher: Academic Press
ISBN: 0080860125
Category : Science
Languages : en
Pages : 637
Book Description
Geophysics Field Measurements
Electromagnetic Methods in Applied Geophysics: Theory
Author: Misac N. Nabighian
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 544
Book Description
As a slag heap, the result of strip mining, creeps closer to his house in the Ohio hills, fifteen-year-old M. C. is torn between trying to get his family away and fighting for the home they love.
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 544
Book Description
As a slag heap, the result of strip mining, creeps closer to his house in the Ohio hills, fifteen-year-old M. C. is torn between trying to get his family away and fighting for the home they love.
Journal of Geomagnetism and Geoelectricity
Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1134
Book Description
Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1134
Book Description
Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
Geothermal Energy
Author: United States. Dept. of Energy. Division of Geothermal Energy
Publisher:
ISBN:
Category : Geothermal engineering
Languages : en
Pages : 346
Book Description
Publisher:
ISBN:
Category : Geothermal engineering
Languages : en
Pages : 346
Book Description