Results 11 to 20 of about 292 (159)

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   +4 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   +4 more sources

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   +2 more sources

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   +2 more sources

3D Forward Simulation of Borehole-Surface Transient Electromagnetic Based on Unstructured Finite Element Method

Minerals
The time-domain electromagnetic method has been widely applied in mineral exploration, oil, and gas fields in recent years. However, its response characteristics remain unclear, and there is an urgent need to study the response characteristics of the borehole-surface transient electromagnetic(BSTEM) field.
Jiayi Liu, Tianjun Cheng, Lei Zhou, Xinyu Wang, Xingbing Xie   +4 more
openaire   +2 more sources

Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas

Advances in Civil Engineering, 2019
Due to the influence of mining technology, some coal mines will leave mined-out areas (or goafs) in the rock mass after mining. If the distribution law and influence scope of mined-out areas cannot be accurately explored and controlled, it will bring ...
Xiao Luo, Shuang Gong, Zhonggang Huo, Hongyan Li, Xinpin Ding   +4 more
doaj   +2 more sources

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   +2 more sources

Forward Modeling Analysis in Advanced Exploration of Cross-Hole Grounded-Wire-Source Transient Electromagnetic Method

Applied Sciences
To address the challenge of accurately detecting hidden water inrush hazards ahead of working faces, a cross-hole transient electromagnetic (TEM) method utilizing a grounded-wire source is proposed.
Jiao Zhu, Zhihai Jiang, Maofei Li, Zhonghao Dou, Zhaofeng Gao   +4 more
doaj   +2 more sources

Transient Electromagnetic Monitoring of Permafrost: Mathematical Modeling Based on Sumudu Integral Transform and Artificial Neural Networks

Mathematics
Due to the ongoing global warming on the Earth, permafrost degradation has been extensively taking place, which poses a substantial threat to civil and industrial facilities and infrastructure elements, as well as to the utilization of natural resources ...
Viacheslav Glinskikh, Oleg Nechaev, Igor Mikhaylov, Marina Nikitenko, Kirill Danilovskiy   +4 more
doaj   +2 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