Results 51 to 60 of about 3,889 (269)

Study on development height of water-conducting fracture zone in mining overlying strata of deep coal seam

Meitan kexue jishu
Underground coal mining causes deformation, movement, breakage, and collapse of the overlying rock layers, forming preferential pathways for water migration, which can easily trigger water inrush accidents from the roof, severely threatening the safe and
Guohua CHEN, Hongtu YAN, Junwen ZHANG, Chao GUO, Suilin ZHANG, Zhaoxu WANG   +5 more
doaj   +1 more source

Prediction of the Height of Fractured Water-Conducting Zone Using Swarm Intelligence Optimization Algorithms

, 2023
Abstract The calculation of the height of fractured water-conducting zone (FWCZ) is of great significance for mine optimization design, water disaster prevention and safety production of the coal mines. In this paper, a height-prediction model of FWCZ based on extreme learning machine (ELM) is proposed.
Dekang Zhao, Zhenghao Li, Guorui Feng, Fulong Wang, Chenwei Hao, Yaming He, Shuning Dong   +6 more
openaire   +1 more source

Influence of Test Temperature and Test Frequency on Fatigue Life of Aluminum Alloy EN AW‐2618A

Advanced Engineering Materials, EarlyView.
The influence of test temperature and test frequency on the fatigue life of EN AW‐2618A is investigated. High‐cycle fatigue tests are performed at different test temperatures and frequencies on the 1000 h/230°C overaged state. Both test parameters reduce fatigue life due to time‐dependent damage mechanisms.
Ying Han, Julian M. Rosalie, Jan Radners, Mauro Madia, Philipp von Hartrott, Birgit Skrotzki   +5 more
wiley   +1 more source

Study on evolution characteristics of fracture field in hard thick overlying strata based on geological generalization

Meikuang Anquan
Accurately grasping the evolution characteristics of the water-conducting fracture zone in the mining overburden is an important basis for preventing the occurrence of water inrush disasters in the working face, especially for the high strength mining ...
Xingbin GAO, Jiajia ZHANG, Kang YANG, Wei HE, Zhihua SHI, Liang CHEN, Ruhong BAI, Qiang SUN   +7 more
doaj   +1 more source

Physical Simulation of the Water-Conducting Fracture Zone of Weak Roofs in Shallow Seam Mining Based on a Self-Designed Hydromechanical Coupling Experiment System [PDF]

, 2020
Due to inappropriate mining practices, water-conducting fracture zones can develop in an aquifer, not only destroying the surface-water environment but also causing water inrush, even hurting or killing workers. To avoid such disasters, investigating and
Qinghong Liu, Weiqun Liu, Hao Zha
core   +1 more source

Modular Critical Element Recycling Platform Using a Nanoporous Additively Manufactured Gyroid

Advanced Engineering Materials, EarlyView.
A modular recycling platform integrates 3D‐printed nanoporous gyroid structures to enable efficient critical element recovery. This system utilizes a hierarchical architecture, combining macroscopic channels with polymerization‐induced nanoscale porosity. By systematically tuning structural wall thickness and resin formulation, the platform achieves an
Xiangyu Gao, Keldy Mason, Mert Gülçür, Rachel Paddock‐Lamb, Prince Alvin Fofanah, Zachariah A. Page, Michael Cullinan   +6 more
wiley   +1 more source

Extension Mechanism of Water-Conducting Cracks in the Thick and Hard Overlying Strata of Coal Mining Face [PDF]

It is of great significance for coal safety production and water resource protection in the Yuheng mining area to master the evolution law of water-conducting fractures under the condition of thick and hard overburden.
Chungang Wang, Haoyu Zhu, Yuyang Guo, Dong Wei, Helong Gu, Hao Wang   +5 more
core   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

Prediction of coal seam water conduction fault zone height based on LC-SSA-BP neural network model [PDF]

, 2023
Aiming at the problems of low prediction accuracy for the height of water-conducting fracture zone and difficult parameters optimization, we propose a guide height prediction method based on improved sparrow search algorithm SSA optimized BP （LC-SSA-BP ...
ZHAO Dekang, HAN Bing, FENG Guorui, SHI Jiabo, REN Henghui, WANG Pengwei, REN Peiyuan
core   +1 more source

Electrochemical Behavior of Flame‐Sprayed Sc‐Doped AlCoCrFeMo High‐Entropy Alloy Coatings in 3.5% Sodium Chloride Solution

Advanced Engineering Materials, EarlyView.
Scandium (Sc)‐doped AlCoCrFeMo HEA coatings are fabricated via flame spraying with 0.1, 0.3, and 0.5 wt% Sc additions. Among these, the HEA‐Sc0.3 coating exhibits the highest corrosion resistance, indicated by a more positive corrosion potential and lower current density.
Pankaj Kumar, Akash Vyas, Mohammad Aatif Qazi, Nashit Jalal, Maria Ophelia Jarligo, Mostafa Yakout, Jing Liu, André McDonald   +7 more
wiley   +1 more source