scholarly journals A More Efficient Observation Way With Electric Dipole Sources

2020 ◽  
Author(s):  
xianxiang wang ◽  
yongbang Chang ◽  
Juzhi Deng
Keyword(s):  
Comparative Analysis ◽  
High Precision ◽  
Numerical Algorithm ◽  
Electric Dipole ◽  
Apparent Resistivity ◽  
Monotonic Functions ◽  
Electromagnetic Data ◽  
Static Effect ◽  
Anomalous Bodies ◽  
Dipole Sources

Abstract The Ex and Hz amplitude are monotonic functions of the resistivity, and numerical algorithm can be utilized to obtain the high-precision apparent resistivity for all frequencies. On this basis, we focus on the comparative analysis of the resolution for Ex field, Hz field, and Cagniard apparent resistivity to conductive and resistance targets, which proves that the Ex field may have a better resolution for the resistance bodies, and the Hz field can better identify the conductive target. Besides, the electromagnetic data is often distorted by the static effect, which seriously affects the application effect of the electromagnetic method. The influence of the static effect on the Ex field, Hz field, is also analyzed. The apparent resistivity based on the Ex field and Cagniard apparent resistivity are severely affected by the static effect which can cover deep anomalous bodies, but the apparent resistivity based on the Hz field is almost unaffected by the static effect. At last, a more efficient observation way is provided for the resistance and conductive targets, respectively.

The Modeling of TEM Responses Simulated by Multi-Transmitter

2012 ◽  
Vol 450-451 ◽  
pp. 1518-1521
Author(s):  
Xin Gong Tang ◽  
Wen Bao Hu ◽  
Liang Jun Yan
Keyword(s):  
Electric Dipole ◽  
Field Survey ◽  
Dipole Source ◽  
Good Resolution ◽  
Controlled Source ◽  
Anomalous Body ◽  
Transient Electromagnetic ◽  
Electromagnetic Responses ◽  
Anomalous Bodies ◽  
Dipole Sources

Using one or two electric dipole transmitters in the Controlled source electromgnetic method, this paper calculate the transient electromagnetic responses of one and two 3D conductive anomalous bodies in the layered earth by varying the number and intensity of the dipole sources. The results of the models show that satisfactory resolution can be achieved when only one dipole source is used. The stronger the intensity of the electric dipole source, the better resolution for the anomalous body for the same offset. When two electric dipole transmitters laid each side of one 3D body, it means that the anomalous body locates in the middle of the sources and the resolution to the target becomes poor. The numerical results of the transient electromagnetic responses of two 3D bodies also support the idea that resolution is not good when two transmitters are used in each side of the targets simultaneously. As the conclusion, in order to get good resolution to the target, multi transmitters laid different side of the geological target should not be used the same time in the field survey.

Adiabatische Korrektur der Born-Oppenheimer-Näherung beim GeS und GeSe / Adiabatic Correction of the Born-Oppenheimer Approximation for GeS and GeSe

1976 ◽  
Vol 31 (3-4) ◽  
pp. 374-380 ◽  
Author(s):  
W. U. Stieda ◽  
E. Tiemann ◽  
T. Törring ◽  
J. Hoeft
Keyword(s):  
Dipole Moment ◽  
High Precision ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Rotational Constant ◽  
Frequency Range ◽  
Rotational Spectra ◽  
Oppenheimer Approximation

Abstract The rotational spectra of GeS and GeSe were measured in the frequency range of 66 GHz to 110 GHz with high precision. The breakdown of the Born-Oppenheimer approximation was observed for the rotational constant yol. With the known molecular 37-factor and the electric dipole moment the adiabatic part of the Born-Oppenheimer correction can be extracted from the primary observa-tion on y01. The adiabatic correction is very similar in both molecules but differs from the results in the earlier measurements on PbS.

Tsallis-Statistical Approach to the Specific Heat of LIQUID 4HE: Comparison with Other Results

1997 ◽  
Vol 11 (19) ◽  
pp. 2303-2310 ◽  
Author(s):  
Sergio Curilef ◽  
Andrés R. R. Papa
Keyword(s):  
Experimental Data ◽  
Comparative Analysis ◽  
Quantum Group ◽  
Specific Heat ◽  
High Precision ◽  
Theoretical Approach ◽  
Statistical Approach ◽  
Precision Measurements ◽  
Best Fitting ◽  
Theoretical Results

A theoretical approach within a quantum-group formalism has recently been proposed and successfully compared to Greywall's high precision measurements of the liquid 4 He specific heat. We calculate here the specific heat for 4 He using Tsallis' non-extensive thermostatistics. A comparative analysis reveals that there is a temperature range where our theoretical results yield the best fitting to experimental data.

Comparative analysis of GPS, seismic and electromagnetic data on the central Tien Shan Territory

2007 ◽  
Vol 431 (1-4) ◽  
pp. 143-151 ◽  
Author(s):  
L. Bogomolov ◽  
V. Bragin ◽  
A. Fridman ◽  
V. Makarov ◽  
G. Sobolev ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Tien Shan ◽  
Electromagnetic Data

Repeatability study of helicopter-borne electromagnetic data

Geophysics ◽  
2006 ◽  
Vol 71 (6) ◽  
pp. G285-G290 ◽  
Author(s):  
Haoping Huang ◽  
Allen Cogbill
Keyword(s):  
Apparent Resistivity ◽  
Correlation Coefficients ◽  
Flight Path ◽  
Control Line ◽  
Average Correlation ◽  
Plan View ◽  
Frequency Dependency ◽  
Electromagnetic Data ◽  
Resistivity Data ◽  
Phase Data

Helicopter-borne electromagnetic (EM) responses depend very much upon the altitude and plan-view flight path, especially when the resistivity of the terrain’s materials varies laterally and/or vertically. Spatially consistent flight paths are required for repeatability analysis of the EM data. Caution should be used in examining the repeatability of the EM data because poor repeatability could result from spatially inconsistent flight paths. However, the apparent resistivity converted from the EM responses is virtually independent of the sensor altitude and directly reflects variations in the resistivity. Therefore, more meaningful repeatability analyses are achieved if the apparent resistivity is used instead of the EM response itself. We have analyzed 32 flights over a control line by using the EM amplitude, the phase, and the apparent resistivity. Our results show that the crosscorrelation for all 496 paired combinations of flights is better for the apparent resistivity than for the EM amplitude or phase. The apparent-resistivity data have average correlation coefficients from 0.89 to 0.94 as the frequency increases, whereas the amplitude and the phase data have average correlation coefficients from 0.78 to 0.85 without obvious frequency dependency.

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