A5029164162- Rock Mechanics and Modeling
- Geomechanics and Mining Engineering
- Coal Properties and Utilization
- Geotechnical and Geomechanical Engineering
- Geophysical Methods and Applications
- Concrete and Cement Materials Research
- Drilling and Well Engineering
- Earthquake Detection and Analysis
- Magnesium Oxide Properties and Applications
- Heat Transfer and Optimization
- Heat Transfer Mechanisms
- Geotechnical Engineering and Underground Structures
- Nanofluid Flow and Heat Transfer
- Landslides and related hazards
- Geotechnical Engineering and Analysis
- Advanced ceramic materials synthesis
- Heat Transfer and Boiling Studies
- Neonatal and fetal brain pathology
- Particle Detector Development and Performance
- Recycling and utilization of industrial and municipal waste in materials production
- Seismic Imaging and Inversion Techniques
- Immune cells in cancer
- Mechanical Failure Analysis and Simulation
- Tailings Management and Properties
- Neuroinflammation and Neurodegeneration Mechanisms
Qingdao University of Technology
2021-2025
China National Administration of Coal Geology
2025
Qingdao University of Science and Technology
2021-2024
Zhengzhou University
2024
China Academy of Launch Vehicle Technology
2022
University of Science and Technology Beijing
2019-2021
Northeastern University
2021
Ocean University of China
2020
Shanghai Children's Medical Center
2020
Northeast Petroleum University
2014
Background: The outbreak of the 2019 novel coronavirus disease (COVID-19) not only caused physical abnormalities, but also psychological distress, especially for undergraduate students who are facing pressure academic study and work. We aimed to explore prevalence rate probable anxiety insomnia find risk factors among a longitudinal using approach machine learning. Methods: baseline data (T1) were collected from freshmen underwent evaluation at two months after entering university. At T2...
We assess the detectability of tidal disruption events (TDEs) using mock observations from Mini SiTian array. select 100 host galaxy samples a simulated catalog based on specific criteria such as redshift, BH mass, and event rate. Taking into account site conditions survey strategy, we simulate over 440 deg$^2$ field. The results indicate that $0.53\pm 0.73$ TDEs can be detected per year when observing in both $g$ $r$ bands with 300-second exposures every 3 days. Applying this method to...
An important part of open-pit mining is the waste dump, where topsoil and rocks extracted during excavation are discharged, mainly including upper material base that carries below. Most external dumping sites directly dumped on initial surface, occupying a large area. According to survey, area soil in countries such as United States Russia has reached more than half total This article takes dump Dongbang mine Shanxi Province research object. Through numerical calculations similar simulation...
The study of structural changes and spontaneous combustion characteristics the coal oxygen composite reaction is key to preventing combustion. In this study, gas from 12-2 seam Donghuantuo Coal Mine was selected for sampling. Various characterization methods were used conduct elemental analysis on raw preoxidized samples at different degrees as well surface internal characteristic oxidized explore pore distribution conversion law pores with sizes. Simultaneously, main functional groups...
Abstract We assess the detectability of tidal disruption events (TDEs) using mock observations from Mini SiTian array. select 100 host galaxy samples a simulated catalog based on specific criteria such as redshift, BH mass, and event rate. Taking into account site conditions survey strategy, we simulate over 440 deg$^2$ field. The results indicate that 0.53±0.73 TDEs can be detected per year when observing in both $g$ $r$ bands with 300-second exposures every 3 days. Applying this method to...
The sodium hypophosphite as an inhibitor in raw coal to investigate the release rate of CO during oxidation heating, and results confirmed inhibition law from a macroscopic perspective.
Joints are the weak plane structures in coal. The existence of joints leads to coal failure, with different fracture modes and energy evolution laws. In this paper, bursting liability index failure joint inclination angles (JIAs) analyzed. results show that an increase angle (JIA), total elastic first decrease then dissipation decreases gradually. changes With JIA, uniaxial compressive strength (Rc) increases, dynamic time (DT) gradually decreases, impact velocity (WST) (KE) increase. went...
In this study, we established a dynamic ejection coal burst model for coalmine roadway subject to stress, and held that the stress concentration zone at side is direct energy source of ejection. The formation development such undergoes three stages: (1) instability propagation cracks in zone, (2) emerging layered storage structure (3) mass or due instability. Moreover, figured out initial strength periodic parallel maximal dominant direction derived from damage strain within finite area...
The application of the acoustic emission (AE) and damage theory to evaluation coal rock stability requires a clear comprehension influence joints. mechanical AE response characteristics evolution samples with different joint angles were analysed through uniaxial compression tests. results show that angle between loading principal stress surface considerably influences degree characterised by AE. However, existing models characterisation do not fully reflect stresses angles. In this paper,...
Abstract The mechanism of rock burst induced by the superposition dynamic and static loads in multicoal seam mining is unique. To investigate propagation attenuation law large‐energy microseismic events under this condition, study employs FLAC3D's module to simulate analyze influence distance, overburden structure mining, interlayer plastic zone on vibration wave attenuation. Results indicate that when coal seams are mined at close distances, waves experience significant while passing...
According to the new stress distribution pattern and strong strata behaviors as characteristics of coal pillars in close‐distance multiseam pillar mining, common different types overlying were summarized analyzed. Moreover, a theoretical model for mechanism mining was established, which validated by monitoring data seismic computed tomography CT, microseism, electromagnetic radiation (EMR). Furthermore, results study indicated that main factors affecting static concentration caused dynamic...
Abstract Rockburst has become a main problem affecting the safety and efficiency of coal mine production. Early warning it is essentially important for management. The dynamic static load sources rockburst, induced by multi-coal seam mining, are more complex, making rockburst prediction difficult. early warnings in multi-seam mining was addressed establishing regional local integrated monitoring method based on following criteria. (i) In space, microseismic (MS) frequency ratio index...
Roadway deformation and rock burst are the two key challenges faced by safe operation of coal mines. Aiming at issue large gob‐side roadway under pillars in multiseam mining, this study has considered case 8308 panel Xinzhouyao mine China. Based upon a combination theoretical analysis, numerical simulations, engineering practices, mechanical model “stress quantitative calculation overlying pillars” was established study. The analytical solutions vertical stress distribution plastic zone were...
Most of the mining method domestic oilfield is waterflood development, thus water content in mid and late flooding would rise faster, oil recovery rate decline relatively more rapid. So it very important to research profile control agent for stabilizing production resin-type agent, focus on researching themal stability, shear resistance, gelation time strength other properties this [1]. Finally, best ratio synthesizing high temperature resistant phenolic was obtained.
To solve the high slurry pressure and severe wear at some sections in backfilling pipelines, this study investigates solution of using an auxiliary pipe to increase resistance reduce mine pipeline. Using computational fluid dynamics, three models, a Z-shaped pipe, S-shaped spiral were constructed velocity distribution characteristics filling pipes analyzed. The function friction loss with different pitches diameters was established, amendment equation for calculating effective stowing...
It is vital to understand the electromagnetic radiation’s time-frequency characteristics in process of coal and rock failure with different joint angles order reveal generation mechanism radiation (EMR) improve accuracy EMR early warning. We studied signals samples angles. The study finds that, (1) increase angle, time peak load decrease first later, postpeak decreases gradually. counts’ value showed a slow rise, sharp rise three intervals α = 0° 45°, 45° 60°, 60° 90°, respectively....