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1 Development and Prospect of Transient Electromagnetic Method |
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1 | (16) |
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1.1 Overview on TEM Method |
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1 | (3) |
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1.2 The Development Direction of TEM |
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4 | (4) |
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1.3 Frontier Subject of TEM Pseudo-seismic Migration and Imaging |
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8 | (5) |
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1.3.1 TEM Imaging Based on Equivalent Time-Frequency Conversion |
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8 | (2) |
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1.3.2 TEM Imaging Technology Based on the Wave Field Conversion |
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10 | (1) |
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1.3.3 Reverse Time Migration and Imaging Method |
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11 | (2) |
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1.4 Research Progress of Pseudo-seismic Migration and Imaging in TEM |
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13 | (4) |
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14 | (3) |
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2 Theory and Technology of Full-Zone Wave Field Transformation |
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17 | (22) |
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2.1 Theoretical Formula Construction |
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18 | (1) |
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2.2 Ill-Posedness of Inverse Wave Field Transformation Analysis |
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19 | (1) |
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2.3 Numerical Methods for Wave Field Transformation |
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20 | (6) |
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2.4 Preconditioned Conjugate Gradient Regularization for Inverse Wave Field Transformation |
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26 | (5) |
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2.5 Correlation Stacking Method for Extracting Pseudo Wave Field |
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31 | (2) |
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2.6 Effectiveness Test of the Algorithm |
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33 | (6) |
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37 | (2) |
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3 Property of TEM Pseudo Wave Field |
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39 | (36) |
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3.1 Two-Layer Model Analysis |
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39 | (10) |
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3.1.1 Wave Field with Single Positive Peak |
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39 | (5) |
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3.1.2 Wave Field with Single Negative Peak |
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44 | (5) |
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3.2 Three-Layer Model Analysis |
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49 | (8) |
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3.2.1 Q-Type Model with Double Positive Peaks |
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49 | (3) |
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3.2.2 H-Type Model with Positive-Negative Peaks |
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52 | (1) |
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3.2.3 K-Type Model with Negative--Positive Peaks |
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52 | (5) |
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3.2.4 A-Type Model with Double Negative Peaks |
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57 | (1) |
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3.3 Wave Field Characteristics of Time-Domain EM Responses with Noise |
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57 | (18) |
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4 Synthetic Aperture Algorithms and Compression of Wavelet Width |
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75 | (12) |
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4.1 Imaging Method Based on Synthetic Aperture |
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75 | (2) |
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4.2 Compression of Wavelet Width |
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77 | (10) |
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4.2.1 The Phenomenon of Waveform Dispersion |
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77 | (1) |
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4.2.2 The Reason of Waveform Dispersion |
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78 | (1) |
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4.2.3 Waveform Dispersion Compression Based on Deconvolution |
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79 | (3) |
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82 | (3) |
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85 | (2) |
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5 Surface Continuation and Imaging of TEM Based on Pseudo Wave Equations |
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87 | (18) |
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5.1 Establishment of Kirchhoff Diffraction Integral |
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87 | (6) |
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5.2 Migration by Kirchhoff Integration (Surface Continuation) |
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93 | (2) |
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5.3 Boundary Element Method for Wave Field Continuation |
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95 | (10) |
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5.3.1 Discretization of Kirchhoff Integration |
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95 | (1) |
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5.3.2 Analysis on Elements |
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95 | (2) |
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97 | (1) |
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5.3.4 Integration Over Elements |
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98 | (7) |
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6 Velocity Analysis of TEM Pseudo Wave Field |
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105 | (20) |
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6.1 Velocity Modelling Based on Equivalent Conductive Plate Method |
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105 | (7) |
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6.1.1 Basic Theory of Equivalent Conductive Plate Method |
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106 | (2) |
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6.1.2 Approximate Calculation of TEM Field at the Surface of a Horizontally Layered Earth |
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108 | (2) |
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6.1.3 Optimized Extraction of Parameter m |
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110 | (2) |
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6.2 Velocity Model for Single Observation Point |
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112 | (2) |
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6.3 Continuous Velocity Analysis |
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114 | (11) |
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6.3.1 Weighted Interpolation Based on Global Distance |
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114 | (1) |
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6.3.2 Localized Linear Interpolation |
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115 | (10) |
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7 Imaging of Theoretical Model and Field Examples |
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125 | |
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125 | (6) |
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125 | (1) |
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7.1.2 Three-Dimensional Model |
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126 | (5) |
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7.2 Examples with Field Data |
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131 | |
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7.2.1 Advanced Detection of Tunnel |
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131 | (4) |
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7.2.2 Detection of Goaf of Coal Mine |
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135 | |
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