Results 121 to 130 of about 3,022 (277)

Dynamic correlation between surface carbon response and underlying emissions from spontaneous combustion goaf: field study of an abandoned coal mine

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
Abandoned coal mine goaf is affected by air leakages and prone to spontaneous combustion, resulting in environmental pollution and geological disasters. Haizhou Open-pit Mine adopts both underground and open-pit mining methods.
Yongjun Wang, Qian Zheng, Hemeng Zhang, Xiaoming Zhang, Wei Dong, Yuichi Sugai, Kyuro Sasaki   +6 more
doaj   +1 more source

Research on the potential of gas resource development in abandoned mines using matter element extension theory

Meitan kexue jishu
Based on the background of national carbon peak and carbon neutrality, in order to accurately judge the development potential of gas resources in the mining stability area of abandoned mines and find out the key factors affecting the development ...
Xuefeng TAO, Biming SHI, Jiwei YUE, Zhen ZHONG, Chengcheng ZHANG, Yuehui LIANG, Haiqing ZHANG, Wenqiang MEI, Yonglin XUE, Jie PENG   +9 more
doaj   +1 more source

Network Structure and the Efficiency Gains from Mergers: Evidence from U.S. Freight Railroads

The RAND Journal of Economics, EarlyView.
ABSTRACT The trade‐off between market power and efficiency gains is central to antitrust analyses of mergers, but empirical evidence quantifying efficiencies remains limited. Using transaction‐level data from U.S. freight railroads (1985–2005), this article quantifies merger‐induced cost efficiencies, driven mainly by eliminating inter‐railroad ...
Yanyou Chen
wiley   +1 more source

Bridging the Late Antique Gap in Northwest Arabia: New Archaeological Evidence on the Occupation of Wādī al‐Qurā (al‐ʿUlā [AlUla], Saudi Arabia) Between the Third and Seventh Centuries CE

Arabian Archaeology and Epigraphy, EarlyView.
ABSTRACT In 2019, the Dadan Archaeological Project (CNRS/RCU/AFALULA) identified a Late Antique village 1 km south of ancient Dadan in the al‐ʿUlā valley (northwest Saudi Arabia). Three excavation seasons at this site (2021–2023) have uncovered a massive building constructed in the late third or early fourth cent.
Jérôme Rohmer, Abdulrahman Alsuhaibani, Charlène Bouchaud, Elora Chambraud, Vladimir Dabrowski, Hatem Djerbi, Fabien Lesguer, Hervé Monchot, Paul Picavet, Louise Purdue, Bertrand Riba, Shadi Shabo   +11 more
wiley   +1 more source

Projectile generator design for underground coal mine seal testing

, 2021
Underground coal mines have several dangers, one of the most hazardous of which is the possibility of an explosion caused by the ignition of methane gas.
Steward, Ethan Allan
core  

New Results From the Pre‐Pottery Neolithic Site of Al Uyaynah, Tabuk, in Northwestern Saudi Arabia

Arabian Archaeology and Epigraphy, EarlyView.
ABSTRACT Al Uyaynah is a low sandstone mound on an alluvial plain, long known for its extensive surface remains of stone‐built circular and rectangular structures. Following test excavations in 2012, more detailed excavation was undertaken in 2016 within one of the largest rectangular stone structures.
Khalid Alasmari, Stephanie F. Piper, Kirsten Grothe, W. Derek Hamilton, Delphine Joly, Penny Bickle, Geoff Bailey   +6 more
wiley   +1 more source

An Analysis Of Extreme Danger Problems Associated With Abandoned Coal Mine Lands In Southwestern Indiana

, 1987
The Surface Mining Control and Reclamation Act of 1977 created revenues for the reclamation of Abandoned Mine Land (AML) problems. The data in this study were obtained from the National Inventory Update of Abandoned Mine Lands for the State of Indiana ...
Elbert, J. A.
core  

Risk assessment of heavy metals in the soil of an abandoned coal mine area [PDF]

During the coal mining process, a large amount of waste such as coal gangue and coal washing water is generated. The heavy metal pollutants in those wastes migrate and diffuse into the surrounding soil and water environment through sedimentation, runoff,
Yaohua CAO, Naiqi FENG, Yan LIU, Yongkang ZHANG, Yao ZHANG, Jia LIU, Qing WANG   +6 more
core   +1 more source

The Late Agricultural Development of Central Arabian Oases—Archaeobotanical and Archaeozoological Studies of the al‐Kharj Oasis

Arabian Archaeology and Epigraphy, EarlyView.
ABSTRACT While oasis settlements emerged during the Bronze Age in Eastern and Northern Arabia, the settlement process in Central Arabia was different. Excavations at al‐Yamāma—main ancient settlement of the al‐Kharj oasis (Riyadh Province, KSA)—suggest that the latter did not emerge before the second half of the first millennium BCE.
Elora Chambraud, Hervé Monchot, Vladimir Dabrowski, Charlène Bouchaud, Jérémie Schiettecatte   +4 more
wiley   +1 more source

Surface movement due to coal mining and abandoned mine flooding

, 2022
To better understand the issues about the surface movements in the coal mining region Lugau-Oelsnitz, Germany, small-scale numerical models are firstly utilized for verifications via analytical solutions, to explore the simulation schemes, and for parameter sensitivity analysis. 1D rock column numerical models shows that simulated surface movements are
openaire   +1 more source