Results 11 to 20 of about 228 (134)

A Uniform Linear Multi-Coil Array-Based Borehole Transient Electromagnetic System for Non-Destructive Evaluations of Downhole Casings

Sensors, 2018
Borehole transient electromagnetic (TEM) techniques have been proven to be efficient for nondestructive evaluations (NDEs) of metal casings using eddy-current properties.
Bo Dang, Ling Yang, Changzan Liu, Yahong Zheng, Hui Li, Ruirong Dang, Baoquan Sun   +6 more
doaj   +3 more sources

Auxiliary Sensor-Based Borehole Transient Electromagnetic System for the Nondestructive Inspection of Multipipe Strings

Sensors, 2017
Transient electromagnetic (TEM) techniques are widely used in the field of geophysical prospecting. In borehole detection, the nondestructive inspection (NDI) of a metal pipe can be performed efficiently using the properties of eddy currents.
Bo Dang, Ling Yang, Na Du, Changzan Liu, Ruirong Dang, Bin Wang, Yan Xie   +6 more
doaj   +3 more sources

Failure mechanism of surrounding rock and synergistic control of strong support-strong pressure relief for lower-seam roadways in close-distance coal seam groups [PDF]

Scientific Reports
To address the problem of asymmetric dynamic failure and superposed stress concentration in lower-seam roadways during stratified mining of deeply buried close-distance coal seam groups in the Jiaoping mining area of Shaanxi Province, where strong mining
Shui Yu, Yonglu Suo, Chiheng Cai, Jian Feng, Xiaoquan Huo, Jian Hu, Jianxi Ren   +6 more
doaj   +2 more sources

Improved adaptive regularization for simulated annealing inversion of transient electromagnetic [PDF]

Scientific Reports
Geophysical inversion usually involves ill-posed problem. Regularization is the most commonly used method to mitigate this problem. There are many regularization parameter selection methods, among which the adaptive regularization method can ...
Xiang Tang, Shangbin Liu, Xiaofei Nian, Shengqiang Deng, Yuchao Liu, Qiongyao Ye, Yingjie Li, Yangyi Li, Tong Yuan, Huaifeng Sun   +9 more
doaj   +2 more sources

Groundwater resources detection based on transient electromagnetic system with small coils in Hongshaquan Mining Area

Meikuang Anquan, 2022
Groundwater environment is closely related to the protection and restoration of surface ecological environment, and the detection of groundwater resources is an important content to master the characteristics of groundwater environment.
LI Haichao, XU Biao, HU Xiongwu
doaj   +1 more source

Three-Dimensional Dual-Mesh Inversions for Sparse Surface-to-Borehole TEM Data

Remote Sensing, 2023
The surface-to-borehole transient electromagnetic (SBTEM) method can provide images at higher resolution for deep earth because its receivers are close to targets.
Luyuan Wang, Yunhe Liu, Changchun Yin, Yang Su, Xiuyan Ren, Bo Zhang   +5 more
doaj   +1 more source

3D forward modeling and response characteristics of low-resistivity overburden of the CFS-PML absorbing boundary for ground-well transient electromagnetic method

International Journal of Mining Science and Technology, 2023
This study used the stable and convergent Dufort-Frankel method to differentially discretize the diffusion equation of the ground-well transient electromagnetic secondary field.
Lijuan Zhao, Mingzhong Gao, Nengzhong Lei, Hongfei Duan, Weizhong Qiu, Zhaoying Chen   +5 more
doaj   +1 more source

EMD-Based Borehole TEM Array Signal Denoising and Baseline Wander Correction for NDT of Downhole Casings

IEEE Access, 2020
Transient electromagnetic (TEM) techniques have been proven to be efficient for nondestructive testing (NDT) operations due to their pulsed eddy-current properties.
Bo Dang, Changzan Liu, Ling Yang, Gang Wang, Mimi Wang, Zhiping Ren, Ruirong Dang   +6 more
doaj   +1 more source

Status and prospect of coal mine geophysical exploration technology in China

Gong-kuang zidonghua, 2017
On the basis of coal mine geophysical exploration technology development represented by channel wave seismic method, mine transient electromagnetic method and underground borehole inclinometry, development directions of mine geophysical exploration ...
ZHANG Peng
doaj   +1 more source

Research on the development height of water-conducting fracture zone in overburden rock based on transient electromagnetic method in hole

Meikuang Anquan
Transient electromagnetic method has shown great effectiveness in detecting water channels. However, conventional methods for detecting the development of water-conducting fracture zones are not suitable due to environmental influences.
Qinghua LIANG, Xiangjun DING, Guangliang LIU, Zhicheng LIU, Chunyuan WANG, Huan ZHANG   +5 more
doaj   +1 more source