Practices for Electrical Methods for Mapping Leaks in Installed Geomembranes

The audiofrequency magnetotelluric (AMT) method has been used to study permafrost thickness near Tuktoyaktuk, N.W.T. in the Mackenzie Delta. In the frequency range of 10 Hz–10 kHz the permafrost behaves as a simple resistive layer over a conductive layer. This simple two-layer model can be inverted by asymptotic models to give a unique value for the thickness of the highly resistive frozen layer. In areas of simple layering, these results correlate well with drilling. In areas of sharp lateral variations in resistivity, depths tend to be underestimated. Unlike other electrical methods, AMT is not hampered by the presence of a surface melt layer in the summer if the conductivity–thickness product of this 'active layer' is less than about 0.03 mho (0.03 S).

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Biological impedance cross evaluation and imaging from composite measurements of magnetic and electrical methods

Bio-Medical Materials and Engineering ◽

10.3233/bme-151469 ◽

2015 ◽

Vol 26 (s1) ◽

pp. S1695-S1702

Author(s):

Peng Ran ◽

Xiaoming Xiao ◽

Wei He ◽

Zhangyong Li

Keyword(s):

Electrical Methods

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Electrical Methods of Blood-Pressure Recording. A Monograph in American Lectures in Medical Physics

Southern Medical Journal ◽

10.1097/00007611-195404000-00030 ◽

1954 ◽

Vol 47 (4) ◽

pp. 386 ◽

Cited By ~ 1

Author(s):

Frank W. Noble ◽

Otto Glasser

Keyword(s):

Blood Pressure ◽

Medical Physics ◽

Pressure Recording ◽

Electrical Methods ◽

Blood Pressure Recording

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ELECTRIC EARTH TRANSIENTS IN GEOPHYSICAL PROSPECTING

Geophysics ◽

10.1190/1.1437105 ◽

1936 ◽

Vol 1 (2) ◽

pp. 271-277 ◽

Cited By ~ 7

Author(s):

Louis Statham

Keyword(s):

Electric Current ◽

Salt Dome ◽

Geophysical Prospecting ◽

The Earth ◽

Electrical Methods ◽

The Times

A suddenly applied electric current is passed through the earth by means of spaced electrodes. The form of the potential transient as it appears outside the current electrodes is studied. The potential transient is extremely rapid and refined methods of recording are necessary. Means for measuring the relative times of the transient potentials received from different points are discussed. A survey taken over a known deep salt dome is shown; anomalous times of the transients are found to exist over the dome. No correlation is seen between the times of the transients and the resistivity as found by ordinary electrical methods.

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