New method for permittivity and conductivity inversion of discrete layered earth

1990 ◽  
Vol 137 (6) ◽  
pp. 346-348
Author(s):  
E.A. Hashish ◽  
M.M. Zahran ◽  
M.N.I. Fahmy
Keyword(s):  
New Method ◽  
Layered Earth

Q‐factor approximation of electromagnetic fields for high‐frequency sounding in the 300 kHz to 30 MHz range over layered media

Geophysics ◽  
1995 ◽  
Vol 60 (4) ◽  
pp. 1253-1258 ◽  
Author(s):  
Walter L. Anderson
Keyword(s):  
Closed Form ◽  
Half Space ◽  
Electromagnetic Fields ◽  
High Frequency ◽  
Analytic Solution ◽  
Layered Media ◽  
New Method ◽  
Earth Model ◽  
Q Factor ◽  
Layered Earth

A new method for rapid approximation of electromagnetic (EM) fields for high‐frequency sounding (HFS) over a layered earth is presented in this paper. The essence of this method uses a Q‐factor correction for extending a closed‐form, half‐space analytic solution to a layered earth model. Use of the Q‐factor in this context was first studied by Wait (1953, 1962). Kraichman (1976) also discusses the problem of when the Q‐factor method can be used to provide a good approximation to an exact layered earth solution.

THE APPLICATION OF FINITE FORWARD DIFFERENCES IN THE RESISTIVITY COMPUTATIONS OVER A LAYERED EARTH

Geophysics ◽  
1966 ◽  
Vol 31 (5) ◽  
pp. 971-980 ◽  
Author(s):  
Misac N. Nabighian
Keyword(s):  
Infinite Series ◽  
New Method ◽  
Layered Earth ◽  
Truncation Errors ◽  
Resistivity Method ◽  
Computational Labor ◽  
Forward Differences ◽  
Correct Estimate

The paper describes a new method of computing the infinite series which arise in the calculation of standard graphs in the resistivity method. It is shown that, by using finite forward differences of higher orders and repeated summations by parts, the convergence of the potential and resistivity series can be improved appreciably. The procedure allows calculations with any degree of accuracy and with a substantial savings in computational labor. A correct estimate of the truncation errors involved may easily be determined.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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