Results 51 to 60 of about 69,019 (276)

Study on Roof Breakage‐Induced Roadway Coal Burst in an Extrathick Steeply Inclined Coal Seam [PDF]

Shock and Vibration, 2019
In view of the coal burst induced by roof breakage in the steeply inclined coal seam (SICS) roadway and its mechanism, a mechanical model was established to investigate the distribution of dynamic and static stresses in the coal seam before and after the breakage of a thick hard roof.
Sheng-Chuan Wang, Dou Li, Zonglong Mu, Jinrong Cao, Xuwei Li   +4 more
openaire   +2 more sources

Evaluation of rock burst in deep coal mining by using forensic engineering [PDF]

, 2015
Rock bursts remain an important problem in longwall coal mining. These bursts are due to a sudden and severe failure of rocks from a high stress concentration in deep underground excavations that occur with the instantaneous release of strain energy ...
Oraee-Mirzamani, B, Zandi, S
core  

Potassium Migration of Chestnut Shell Ashes Under Oxidizing Atmosphere and Its Modification Mechanism by Additives

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT Biomass energy plays a critical role in alleviating environmental pressures. However, its relatively high content of alkali metals (especially for potassium) would cause ash‐related issues during combustion. To mitigate these issues, the potassium migration behaviors during chestnut shell (CS) conversion and the modification mechanisms of ...
Meijie Zhou, Weijie Guo, Fenghai Li, Xuefei Liu, Ziqiang Yang, Mingjie Ma, Yitian Fang   +6 more
wiley   +1 more source

A self-supervision rockburst risk prediction algorithm based on automatic mining of rockburst prediction index features

Frontiers in Earth Science
The rockburst risk prediction based on microseismic (MS) data is an important research task in deep mine safety prevention. However, the lack of systematic research on explicit prediction indexes and the waste of a large amount of unlabeled data are ...
Xiufeng Zhang, Haikuan Zhang, Haitao Li, Guoying Li, Shanshan Xue, Haichen Yin, Yang Chen, Fei Han   +7 more
doaj   +1 more source

Influence of Wall Deformation Structure on the Liquid Film Flow Behavior Under Turbulent Conditions

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT To explore the influence of typical wall deformation structure in the scrubbing‐cooling tube on the liquid film, this paper studied the liquid film flow behavior on the riblet walls with representative riblet radii and compared them with the flat wall. Under different liquid film Reynolds numbers (Rel = 8.3 × 103 ~ 3.14 × 104), the liquid film
Qian Liu, Yifei Wang, Jie Zeng, Zongren Pan, Dawei Feng, Guangsuo Yu   +5 more
wiley   +1 more source

Study on initial fracture distribution and bearing damage evolution mechanism of disturbed coal samples in oil-rich coal deposits in western China

Frontiers in Materials
The simultaneous formation of stress transfer and structural optimization in deep underground engineering strongly influences the occurrence and severity of dynamic disasters, especially under complex stress–structure conditions.
Yawu Shao, Yawu Shao, Yawu Shao, Yawu Shao, Lei Zhu, Lei Zhu, Lei Zhu, Chang Xin, Gang Han, Gang Han, Gang Han, Haifei Lin, Hu Liu, Hu Liu, Hu Liu, Jiahao Xie, Jiahao Xie, Jiahao Xie, Jiahao Xie, Mingming Sun, Mingming Sun, Mingming Sun, Jin Wang, Jin Wang, Jin Wang   +24 more
doaj   +1 more source

Rock burst risk evaluation based on equivalent surrounding rock strength

International Journal of Mining Science and Technology, 2019
On-site investigations consistently show that the rock burst inherent to coal seams varies greatly with coal seam thickness. In this study, impact factors related to coal seam thickness and surrounding rock strength were analyzed and a corresponding rock
Jinglin Wen, Husheng Li, Fuxing Jiang, Zhengxing Yu, Haitao Ma, Xiaolin Yang   +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

Index to 1981 NASA Tech Briefs, volume 6, numbers 1-4 [PDF]

, 1986
Short announcements of new technology derived from the R&D activities of NASA are presented. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage ...

core   +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