Results 171 to 180 of about 6,331 (210)

Extraction and selection of geoelectrical data features

2009 16th International Conference on Digital Signal Processing, 2009
Extraction and selection of proper signal characteristics is a significant step affecting the success of any subsequent data analysis. We describe a process used to extract features from a 6-year, single-channel Long Term Geoelectric Potential difference (LTGP) signal, recorded in 1998–2003 at Western Greece.
Apostolos Ifantis, Vasilis N. Nikolaidis
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On the geoelectrics of inhomogeneous media

Izvestiya, Physics of the Solid Earth, 2015
This work, largely methodological, is devoted to the analysis of the key equation of geoelectrics. In the one-dimensional (1D) case, when the electric conductivity only depends on a single Cartesian coordinate, the equation of geoelectrics is reduced to the form of the Helmholtz equation.
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ANALYSIS OF CORRELATION PROPERTIES IN GEOELECTRICAL DATA

Fractals, 2003
This paper considers four geoelectrical time series, measured in a seismic area of Southern Italy. Lomb Periodogram method, Higuchi analysis, Detrended Fluctuation Analysis (DFA) and the mean distance spanned within time L are used to discuss the correlation properties of these signals.
Colangelo G, Lapenna V, Telesca L
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Geoelectric Models of Kamchatka Active Volcanic Regions According to the Near-surface Geoelectric

Proceedings, 2014
Основной целью работы было определение структуры и путей миграции высокоминерализованных растворов в приповерхностном пространстве термальных полей Мутновского вулкана (Камчатка, Россия).
S.P. Bortnikova, I.N. Yeltsov, A.N. Faguet, D.I. Fadeev   +3 more
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Geoelectric Discontinuity Detector

1973 IEEE G-MTT International Microwave Symposium, 1973
It is sometimes necessary to quickly localize a mine bed within an accuracy of a few cm. in depth. Such high accuracy measurements are made by chemical or physiochemical methods. These methods have the disadvantage of requiring a few hours of time due to the necessity of measuring the metallic content of the ore in the laboratory rather than in situ ...
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Experiences of 2-D Geoelectrical Imaging

1st EEGS Meeting, 1995
Over the past three years we have carried out several two-dimensional (2-D) electrical imaging in order to verify the reliability of this technology in different environmental and geological conditions. The 2-D resistivity imaging method is in wide use and successfully employed for detecting pollutants diffusion, in groundwater monitoring, in buried ...
CHIARA P, GODIO, Alberto, SOCCO, LAURA, ZERILLI A.   +3 more
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Geoelectrical Measurements for Agricultural Canal Seepage Detection

Proceedings, 2012
The protection of water resources is a current problem at a global scale, especially in regions where this resource is poorly available. In this respect there is an increased pressure on water managers to improve water use efficiency. The use of geophysical tests as a tool for managing the efficiency of irrigation networks is well documented in ...
COMINA, Cesare, L. Sambuelli
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GEOELECTRICAL PROSPECTING WITH UNDERGROUNDELECTRODES*

Geophysical Prospecting, 1962
AbstractIn many situations, because of the great influence of a surface layer on apparent resistivity values, the interpretation of electrical soundings may be very indeterminate, according to the “equivalence principle”.For these situations, an arrangement which includes an underground electrode has been proposed.
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Examples of geoelectric surveys

Proceedings of the IEE Part A: Power Engineering, 1959
The Introduction deals briefly with the general principles underlying geoelectric methods of surveying and gives a simple formula for the apparent resistivity at a given depth below the surface in a homogeneous medium. The two problems of interpreting the different kinds of curves obtained from field measurements and of determining the depth of the ...
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Methods for Geoelectrical Data Inversion

1981
Professor Alfano has faced the wide problem of interpretation of resistivity measurements in the presence of tridimentional distribution. This is probably the line of research that will produce remarkable progress in the application of resistivity measurements.
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