Results 51 to 60 of about 653,647 (206)
Analysis of reasonable position layout of lower and large thickness coal seam
矿业科学学报, 2017 In the near distance multi coal seam mining, special underground pressure of the lower coal seam appears affected by the mining of upper coal seam.How to arrange the lower seam roadway safely and effectively is not only the key to ensure the safety and ...
Meng Hao, Jia Shangwei, Cheng Zhanbo
doaj
Meikuang AnquanAiming at the on-site technical problems that coal mining of uncovering coal in crosscut under complex geological conditions is prone to cause coal and gas outburst disasters, the disaster-causing mechanism analysis method is adopted to comprehensively ...
Jiang WANG +6 more
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THE NIGERIAN COAL CORPORATION: AN EVALUATION OF PRODUCTION PERFORMANCE(1960 1987) [PDF]
COAL WAS DISCOVERED IN NIGERIA IN 1909 AND COAL MINING STARTED WITH A DRIFT MINE AT OGBETE, ENUGU IN 1915. SINCE 1958/59, WHEN COAL PRODUCTION REACHED ITS PEAK, THERE HAS BEEN A PERSISTENT FLUCTUATION IN THE AMOUNT OF COAL PRODUCED IN SUBSEQUENT YEARS ...
DR. GODWIN CHUKWUDUM NWAOBI
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Socioeconomic Impacts of Potential Wishbone Hill Coal Mining Activity [PDF]
, 2010 The purpose of this study is to assess some of the significant socioeconomic effects of potential coal mining activity at Wishbone Hill. The analysis scenario assumes a 16-year period of startup and mine production using two known deposits that are ...
Colt, Steve, Schwörer, Tobias
core
Meitan xuebaoCoal seam water injection is widely used for coal seam gas control, and the key to its effectiveness in controlling gas lies in the wetting effect of water on coal body.
Jiwei YUE +7 more
doaj +1 more source
Evaluation of top coal cavability based on PCA-FDA model
矿业科学学报, 2018 In order to evaluate top coal cavability reasonably, and determine whether coal seam is suitable for top-coal caving.The top coal cavability evaluation model (PCA-FDA) was established by combining principal component analysis(PCA) and Fisher ...
Xue Liming +5 more
doaj +1 more source
The Globalization of Steam Coal Markets and the Role of Logistics: An Empirical Analysis [PDF]
In this paper, we provide a comprehensive multivariate cointegration analysis of three parts of the steam coal value chain - export, transport and import prices.
Aleksandar Zaklan +3 more
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Simulation Modeling and Analysis of Coal Shipping Operations [PDF]
, 2013 Computer simulations are increasingly powerful and realistic models for complex real-world scenarios, and our project applies this technology to model a coal transportation case study. Given a baseline scenario of fourteen carriers transporting coal from
Finzel, Raymond +2 more
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An approach to the use of fixed carbon-volatile matter graph [PDF]
, 1986 The use of the fixed carbon-volatile matter (FC-VM) graph for quick calculations of proximate analysis data, as well as for simple presentation of coal classification is illustrated. From the position of the VM and FC values of a coal on the graph (on an
Jankes, Goran, Radovanović, Milan
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Identification and mapping of coal refuse banks and other targets in the anthracite region [PDF]
ERTS-1 MSS data covering parts of Pennsylvania's southern and eastern middle anthracite coal fields were studied to determine how well accumulations of coal refuse could be identified and mapped by computer analysis and processing. Spectral signatures of
Borden, F. Y. +2 more
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