Results 51 to 60 of about 1,192,531 (239)

Positioning System of Underground Coal Mines Based on ZigBee Technology [PDF]

, 2014
The study introduces the man and machine positioning system of underground coal mines based on the ZigBee Wireless Communication Technology. It can realize the effective management of the precise positioning of machine and the workers.
Yan, Li Gang, De, Zhang
core   +1 more source

Upper bound limit analysis of coral reef limestone cavern roof stability incorporating a tension‐shear failure mechanism with tensile‐strength cut‐off

Deep Underground Science and Engineering, EarlyView.
For the roof of coral reef limestone caverns, a novel tension‐shear composite failure mechanism was developed. The most critical tensile crack model was identified using a hybrid optimization algorithm, and the stability of the cavern roof was analyzed accordingly.
Dongsheng Xu, Chenxu Li, Chuantan Hou
wiley   +1 more source

Explainable hybrid stacking ensemble method for hard rock pillar stability prediction and engineering applications

Deep Underground Science and Engineering, EarlyView.
This research proposes an interpretable hybrid stacking ensemble framework, optimized by the Sparrow Search Algorithm, to enhance hard rock pillar stability prediction. By integrating six machine learning models—k‐nearest neighbors, support vector machines, random forests, Gradient Boosting Decision Tree, eXtreme Gradient Boosting, and Light Gradient ...
Ning Wang, Guoyan Zhao, Meng Wang, Taraka Pattela   +3 more
wiley   +1 more source

Design of personnel positioning system of special coal mine

Gong-kuang zidonghua, 2015
For demand of positioning of ground personnel of special coal mine besides to underground personal, the paper proposed a design scheme of personnel positioning system of special coal mine which uses dual-frequency.
WANG Wei, HUO Zhenlong, LING Yun, TAN Dake   +3 more
doaj   +1 more source

Developing a universal tunnel span classification from global tunnel databases

Deep Underground Science and Engineering, EarlyView.
A universal tunnel span classification system is introduced that incorporates tunnel span, cross‐sectional area, typical tunnel types, and intended uses. Representative flatness ratio values are also provided for each span class. The classification is derived from a comprehensive database of 450 tunnel profiles from 47 countries.
Simon Heru Prassetyo, Inzagi Suhendar, Semmy Andrew Anugerah Djawa Tagi, Bonifacio Bondan Satryojati, Dzakwan Naufal Pratama, Yeremia Sintong Damero, Yudhidya Wicaksana, Erwin Lim, Ridho Kresna Wattimena   +8 more
wiley   +1 more source

Modifiable Transdiagnostic Risk and Protective Factors as Potential CBT Augmentation Targets for Eating Disorders: An Updated Umbrella Review

International Journal of Eating Disorders, EarlyView.
ABSTRACT Objective A focus on transdiagnostic targets is one of the key strategies for developing effective, efficient, and scalable treatments for mental health conditions. We conducted an umbrella review of recent meta‐analyses (August 2022 to May 2026) to update our understanding of critical transdiagnostic intervention targets that could inform ...
Yuan Zhou, Marcela Radunz, Tracey D. Wade   +2 more
wiley   +1 more source

Environmental Statecraft, Fragmented Authoritarianism, and Technocratic Governance: The Structure and Agency of China's Local Environmental Politics

Environmental Policy and Governance, EarlyView.
ABSTRACT Local environmental politics in China is often said to be dominated by state‐controlled modes of multi‐level governance. However, top‐down governance is embedded within and transformed by local politics, adding complexity to governance practices and environmental outcomes.
Minsi Liu, Kevin Lo
wiley   +1 more source

Underground personnel positioning system based on 5G+UWB and inertial navigation technology

Gong-kuang zidonghua
In practical applications of coal mine personnel positioning systems, there are problems of insufficient equipment computing power and storage resources.
LI Mingfeng, LI Yan, LIU Yong, WU Xuesong, XU Jisheng, CHANG Jianming, WANG Tao, PAN Hongguang   +7 more
doaj   +1 more source

Research on Underground Personnel Positioning Method Based on PSO-GSA Optimization

, 2016
In the case of coal mine accidents, in order to ensure timely rescue of the suffering people in a complex environment of underground localization, focusing on Received Signal Strength Indicator (RSSI) in underground personnel positioning accuracy is low ...
JiaHui Chen, Tianze Li, Ye Liu, Tao Gao, Yuhan Wang   +4 more
core   +1 more source

Study on Fluid Pressure in Tubing, Dynamic Stress in Reservoir, and Fracture Propagation Morphology During Variable‐Rate Hydraulic Fracturing

Energy Science &Engineering, EarlyView.
Variable‐rate hydraulic fracturing can induce unsteady flow in the tubing, thereby generating fluctuating fluid pressure near the bottom‐hole reservoir. Dynamic stress is generated in the reservoir under the action of fluctuating fluid pressure and propagates as stress waves.
Zhu Ge, Wang Chaojing, Li Weicheng
wiley   +1 more source