Results 81 to 90 of about 765,751 (280)

Study on the mining response law and coal burst risk assessment of an isolated working face

Frontiers in Earth Science
With the increasing demand for coal resources and the unreasonable arrangement of subsequent working faces, mining activities in isolated working faces are more likely to induce coal burst accidents.
Guojun Liu, Ruide Lei, Ling Huang, Menglai Li, Jiankun Zhou   +4 more
semanticscholar   +1 more source

Evolutionary radiation of large‐bodied gorgonopsians from the lower Abrahamskraal formation of South Africa

The Anatomical Record, EarlyView.
Abstract The middle Permian represents a critical interval in therapsid evolution, when gorgonopsians emerged as some of the first specialized apex predators within terrestrial ecosystems. Despite their significance, the early diversification of Gorgonopsia in Gondwana remains poorly understood due to scarcity and fragmentary material.
Zanildo Macungo, Ricardo Araújo, Bruce S. Rubidge, Michael O. Day, Kathleen N. Dollman, Julien Benoit   +5 more
wiley   +1 more source

Experimental Study of Prevention and Control of Rock Burst in Steeply Inclined Coal Seams by Mining Sequence and Filling

Shock and Vibration, 2022
The control and prevention of rock burst in a steeply inclined coal seam are essential. In order to figure out the effects of filling and mining sequence on rock burst in the steeply inclined coal seam, B3+6 and B1+2 coal seams in Wudong coal mine are ...
Zhihui Zhang, Yangyi Liu, Wenwen Zhu, Jian Liu, Tian Ma, Chunxue Xie   +5 more
doaj   +1 more source

Disturbance response instability theory of rock bursts in coal mines and its application

Geohazard Mechanics, 2023
Aiming at the rock burst prevention in coal mines, this study argue that a rock burst is the instability of the coal mass deformation system with the infinite deformation response subjected to a small disturbance, and the concepts of control, disturbance
Yishan Pan, Aiwen Wang
doaj   +1 more source

Engineering Biochar‐Derived Functional Materials for High‐Performance Supercapacitors: Design Principles, Mechanisms, and Scalable Strategies

Carbon Energy, EarlyView.
ABSTRACT Biochar has emerged as a useful and adaptable source of carbon for supercapacitor electrodes. Its value comes from the way biomass chemistry, thermal conversion, and activation conditions shape the resulting pore network, surface groups, and degree of carbon ordering.
Soumen Mandal, Avinash C. Mendhe, Mayna Roy, Neha S. Barse, Taejoon Park, Han‐Seung Lee, Haigun Lee   +6 more
wiley   +1 more source

Functionalized Organic Lithium Salt Enables Flexible Solid‐State Electrolytes With Dual‐Ion Channels for Safe Li Metal Batteries

Carbon Energy, EarlyView.
Here, we design a flexible and non‐flammable solid‐state electrolyte with hierarchical dual‐ion conductive channels. The engineered electrolyte combines continuous organic conductive‐phase pathways for fast bulk Li+ transport and dynamic polymer networks for interfacial ion hopping, achieving unprecedented room temperature conductivity (> 1 mS cm−1 ...
Yijing Liu, Zifan Bu, Han Fang, Xiao Xu, Jinrui Hu, Lixia Bao, Weibo Kong, Jiliang Wang   +7 more
wiley   +1 more source

Distribution characteristics of pulverized coal and stress–gas pressure–temperature response laws in coal and gas outburst under deep mining conditions

Energy Science & Engineering, 2022
Deep mining will increase the likelihood of coal and gas outburst accidents and do harm to the safety of coal mining. In this study, a coal and gas outburst experiment under deep high‐stress conditions was carried out and stress–gas pressure–temperature ...
Bo Zhao, Guangcai Wen, Qianwei Ma, Haitao Sun, Fazhi Yan, Jun Nian   +5 more
doaj   +1 more source

Sustainable Germanium Recovery From Germanium Dioxide via Halogen‐Free Chemical Vapor Transport

Chemistry – A European Journal, EarlyView.
Recovery of the critical element Ge from GeO2 and SiO2/GeO2 mixtures was investigated based on an endothermic chemical vapor transport via GeO, formed with natural gas or a hydrogen(10%)‑argon(90%) mixture and water vapor. (This picture was partly created with AI, engine: Adobe Firefly).
Julian Burkhart, Christian A. Bömer, Jana Milanovic, Victoria S. Drescher, Igor Atanasov, Moritz Maxeiner, Klaus Müller‑Buschbaum   +6 more
wiley   +1 more source

Deformation mechanism and rock burst prevention technology of service roadway under residual coal pillar

, 2022
In view of stress concentration, roadway deformation, rock burst and difficult support in the mining of the underlying coal seam under the residual coal pillar, we uses theoretical analysis and numerical simulation to analyze the stress distribution law ...
WEI Hui, LI Jie, SONG Shikang
core   +1 more source

Global and Detailed Calculation of Tube Wall Temperature in a Process Furnace Steam Superheater

Chemie Ingenieur Technik, EarlyView.
This study presents a comparison between an iterative global model and multiple approaches to a new non‐iterative model with the purpose of predicting tube wall temperature of a superheater. The results show that the non‐iterative method achieves sufficient accuracy while improving the prediction of local temperature distribution and better ...
Anežka Michálková, Zdeněk Jegla
wiley   +1 more source