Results 41 to 50 of about 954 (132)

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

Mechanisms of Roadway Instability and Coupled Control Technology for Working Face Passing Through Fault Zones

Energy Science &Engineering, EarlyView.
This study mainly explores the instability characteristics of roadways near faults in the working face. Taking the 51104 transportation roadway of the 51104 working face in Shengxin Coal Mine as the main research object, through theoretical analysis, borehole inspection, numerical simulation and on‐site mine pressure observation, the instability ...
Shuaifeng Yin, Yitao Yan, En Wang, Xubo Zhao, Kanglei Han   +4 more
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

Optimization of Blasting‑Induced Roof Cutting Parameters in Key Stratum and Its Application in Gob‑Side Entry Retention Technology

Energy Science &Engineering, EarlyView.
This study addresses hard roof coal seam conditions by optimizing key stratum blasting‐cutting parameters through theoretical analysis, numerical simulation, and field tests. It proposes calculation methods for blast hole spacing and delay timing based on stress wave theory, controlling roadway deformation within 35 mm, thereby enhancing resource ...
Qiong Liu, Duanxiang Fu, Hongbin Li
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

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

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

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

The Early Upper Palaeolithic open‐air site of Friedrichsdorf‐Seulberg, Germany, in the context of the northern central European Aurignacian

Boreas, EarlyView.
Our knowledge of the Early Upper Palaeolithic occupation in northern central Europe is very limited, and recent research at the open‐air site of Friedrichsdorf‐Seulberg in Hesse, Germany, provides important new information on the Aurignacian. The site is rather small (26.5 m2) and spatial analysis identified a central hearth with two associated ...
Tilman Böckenförde, Gabriele Russo, Neda Rahimzadeh, Felix Bittmann, Nikolitsa Nikolakopoulou, Thomas Terberger   +5 more
wiley   +1 more source