Results 51 to 60 of about 2,851 (220)

Application of a novel schema for describing fossil fern foliage and investigating taxonomic and morphological change across the Cretaceous–Paleogene boundary in western North America

American Journal of Botany, EarlyView.
Abstract Premise The Chicxulub asteroid impact at the Cretaceous–Paleogene (K–Pg) boundary triggered a mass extinction 66 million years ago. Ferns thrived in the aftermath of the extinction, evidenced by the well‐documented “fern spore spike.” However, fern macrofossil records across the K–Pg boundary are less understood.
Fern B. Holian, Emily B. Sessa, Richard S. Barclay, Regan E. Dunn, Jacquelyn L. Gill, Kirk R. Johnson, S. Augusta Maccracken, Ian M. Miller, Jarmila Pittermann, Ellen D. Currano   +9 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

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

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

An investigation into coal burst process based on the stiffness variation of coal-rock system

Meitan xuebao
The monitoring, early warning, and prevention of coal burst in underground coal mines have remained a worldwide challenge perplexing both academia and the mining industry, due to its inherent characteristics of process complexity, sudden occurrence, and ...
Wu CAI, Aixin LIU, Xuming ZHU, Shasha YUAN, Linming DOU   +4 more
doaj   +1 more source

Signalling ESG Misconduct: What Matters to Investors?

Business Strategy and the Environment, EarlyView.
ABSTRACT We investigate what matters most to investors when environmental, social and governance (ESG)‐related corporate misconduct news is signalled and how these factors influence the magnitude of market value punishment. Using an event study on 44,859 corporate news items related to ESG incidents, we find that investors react negatively to such ...
Dewan Muktadir‐Al‐Mukit
wiley   +1 more source

A review of energy associated with coal bursts

International Journal of Mining Science and Technology, 2018
A coal burst is defined as a rapid expulsion of coal (and potentially gas) from the boundary of the roadway. Rock and coal fractures together with micro seismic vibration is a common occurrence during mining, however, it is very uncommon for coal and rock to be propelled into the roadway.
openaire   +2 more sources

Graphene Materials for Sustainable Energy Applications: A Contemporary Perspective

Carbon Energy, EarlyView.
ABSTRACT Graphene has garnered significant attention as a promising material with great potential for contributing to sustainable energy initiatives, such as RE100 (100% renewable energy initiative) and CF100 (100% carbon‐free initiative). This review aims to explore the potential of graphene for advancing renewable energy applications by highlighting
Niraj Kumar, Seul‐Yi Lee, Roop L. Mahajan, Soo‐Jin Park   +3 more
wiley   +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

Destabilization and energy characteristics of coal pillar in roadway driving along gob based on rockburst risk assessment [PDF]

Royal Society Open Science, 2019
Roadway driving along adjacent goafs is an effective method to develop the recovery rate of coal resources. However, rock burst triggered by dynamic destabilization of coal pillars poses a serious threat to safe and efficient mining, thereby ...
Yi Xue, Zhengzheng Cao, Wenlong Shen
doaj   +1 more source