Results 61 to 70 of about 7,043 (214)

Mining technology and support optimization design of super high fully mechanized caving and small mining ratio in hard and extra thick coal seam

Meikuang Anquan, 2021
In order to realize the safety, high efficiency and high recovery rate mining of 9-13 m thickness hard coal seam in Jinjitan Coal Mine, the top coal recovery rate and coal wall stability of different cutting heights are analyzed by theoretical analysis ...
MENG Xiangjun, ZHANG Jinhu, LI Mingzhong, YUE Ning, XU Yongxiang, TONG Peng, CAI Fenghua   +6 more
doaj   +1 more source

Reconstructing the Holocene explosive eruptive history of the Erciyes volcano (Turkey) using proximal and distal tephra records

Journal of Quaternary Science, EarlyView.
ABSTRACT Mount Erciyes, the largest active volcano of Central Anatolia (Turkey), erupted explosively during the Holocene, producing the Karagüllü, Perikartin and Dikkartin tuff rings. Even though major cities like Kayseri and its ~1 million residents sit directly on these pyroclastic deposits, the timing and magnitude of the explosive eruptions have ...
Ivan Sunyé‐Puchol, Rengin Özsoy‐Ünal, Xavier Bolós, Victoria C. Smith, Efe Akkas, Lorenzo Tavazzani, Jan Aymerich, Manuela Nazzari, Pierre Lacan, Victoria Cullen, Olivier Bachmann, Piergiorgio Scarlato, Silvio Mollo   +12 more
wiley   +1 more source

Research on the characteristics of the falling behavior of mixed coal and gangue

Gong-kuang zidonghua
Traditional studies on the dynamic characteristics of coal flow during the top coal caving process, based on image detection technology, have primarily focused on specific-stage image analysis, lacking a comprehensive analysis of dynamic characteristics ...
SHAN Pengfei, YANG Tong, SUN Haoqiang, XI Bojia   +3 more
doaj   +1 more source

Экологические аспекты прогрессивных технологий отработки мощных угольных пластов с выпуском подкровельной толщи [PDF]

, 2017
В статье рассматриваются экологические аспекты прогрессивных технологий отработки мощных угольных пластов с выпуском подкровельной толщи, а также последствия не полной выемки угля в отработанных участках шахт, которые наносят экологический ущерб в виде ...
Клишин, В. И., Никитенко, С. М., Пфаргер, Е. С.   +2 more
core  

Boredom, despondency, and the scourge that lays waste at noon: an anthropology of acedia Ennui, abattement et le fléau qui frappe à midi : une anthropologie de l'acédie

Journal of the Royal Anthropological Institute, EarlyView.
Attentive to the ways that inertia can take hold of life, Catholic monks recognize despondency as a potential not only within the monastery, but in contemporary society more widely. Such experiences are regularly mapped onto an understanding of what early Christian monks termed ‘acedia’ (a Greek term that can be translated as ‘lack of care’). Taking as
Richard D.G. Irvine
wiley   +1 more source

Application of improved and optimized fuzzy neural network in classification evaluation of top coal cavability

Scientific Reports, 2021
Longwall top coal caving technology is one of the main methods of thick coal seam mining in China, and the classification evaluation of top coal cavability in longwall top coal caving working face is of great significance for improving coal recovery ...
Meng Wang, Caiwang Tai, Qiaofeng Zhang, Zongwei Yang, Jiazheng Li, Kejun Shen   +5 more
doaj   +1 more source

Safe passing critical criterion for drawn top-coal on rear conveyor and accurate control approach for drawing opening dimension

Meitan kexue jishu, 2023
Fully mechanized top coal caving technology has become the mainstream way of high yield and high efficiency mining in extra thick coal seams in China.
Donghui LI, Dongyin LI, Shen WANG, Zhizeng HUANG, Qing LIU, Xueliang ZHANG, Lijun ZHENG, Xuhe ZHANG, Shiting ZHU   +8 more
doaj   +1 more source

Response of Remote Tropical West Pacific Islands to Climate Variability: A Multiproxy Record From T‐Lake, Palau, Spanning the Early Holocene to Present

Archaeometry, EarlyView.
ABSTRACT Lake sediments are natural archives of past environmental dynamics and how these systems have responded to past climate variability. Sediment geochemistry, governed by local geology and climate processes, is unique to each lake‐catchment and geochemical proxies must be validated for each study site.
Jalene Nalbant, Larissa Schneider, Jessica L. Blois, Matthew Wolhowe, Julian P. Sachs, Simon G. Haberle, Geoffrey Clark   +6 more
wiley   +1 more source

Dynamic Random Arching in the Flow Field of Top-Coal Caving Mining

Energies, 2018
The large mining height fully mechanized top-coal caving mining technique has developed rapidly and become the most extensively used mining method for ultra-thick coal seams. The arching of coal/gangue and the drawing out of gangue are peculiar phenomena
Ningbo Zhang, Changyou Liu, Xiaojie Wu, Tingxiang Ren   +3 more
doaj   +1 more source

Optimization of Caving Technology in an Extrathick Seam with Longwall Top Coal Caving Mining

Advances in Materials Science and Engineering, 2021
The optimization of top coal caving technology is an efficient method to improve the recovery ratio in longwall top coal caving (LTCC). In extrathick coal seams, the conventional single-opening sequential caving technology (SOSCT) shows the following ...
Liu Yang, Lianghui Li, Weijie Wei
doaj   +1 more source