Results 41 to 50 of about 653,647 (206)
EnergiesIn many energy policies, including Poland’s, environmental priorities clash with the issue of energy security. With these contradictions in mind, the main objective of the article is a comparative analysis of domestic production and imports of hard coal ...
Izabela Jonek-Kowalska, Wieslaw Grebski
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Energy Exploration & Exploitation, 2018 This paper presents an experimental study on the effect of potassium hydroxide concentration and reaction time on coal properties during desulphurization of high sulphur Indian coal. Experimental results showed that maximum of 36.79% of total sulphur can
Bhupendra S Ken, Barun K Nandi
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Effects of coal rank on physicochemical properties of coal and on methane adsorption
International Journal of Coal Science & Technology, 2017 For the thorough research on coal metamorphism impact on gas adsorption capacity, this paper collected and summarized parameters of experimental adsorption isotherms, coal maceral, proximate analysis and ultimate analysis obtained from National ...
Yuanping Cheng +5 more
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Research on the characteristics of the falling behavior of mixed coal and gangue
Gong-kuang zidonghuaTraditional 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 +3 more
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Coal mining areas: environmental issues and solutions (on the example of Kuzbass) [PDF]
, 2015 Rozdział z: Functioning of the Local Production Systems in Central and Eastern European Countries and Siberia. Case Studies and Comparative Studies, ed. Mariusz E.
Tsvelodub, Yuliya
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Structural Analysis of Coal and Coal-derived Oil.
Journal of The Japan Petroleum Institute, 1992 核磁気共鳴法と質量分析法による, 石炭および液化油の構造解析法について概説した。固体高分解能CP/MAS13C-NMRは石炭の炭素分布の直接測定を可能にし, その構造特性を明らかにした。石炭の炭素と酸素分布に基づいて算出した構造単位の構造指数から, 低石炭化度炭の平均芳香族環数は1～3環, 高石炭化度炭のそれは3～5環であることが示された。また, 石炭の低温空気酸化と加熱処理による化学構造の変化およびその反応特性を調べた結果, いずれもメチレン基炭素の著しい減少が見られた。一方, 液化油の分析には, 溶液13C-NMR法による平均構造解析法と, FI-MS法による構造分布解析法が有効であった。13C-NMR法では, 芳香族部分の炭素分布から平均化学構造の構造指数が直接求められ, 1H ...
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Coal accumulation control on gas and coalbed methane exploration potential in southern Ordos Basin: A case study of Carboniferous Taiyuan Formation in Xunyi exploration area [PDF]
Youqicang pingjia yu kaifaBased on the analysis of the coal-forming environment of the Carboniferous Taiyuan Formation in Xunyi exploration area, southern Ordos Basin, and combined with paleogeomorphological analysis and sedimentary facies research, the coal accumulation ...
WANG LIANGJUN +7 more
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The investigation of heavy metal ion content in rock and coal production [PDF]
, 2013 Приведено олгляд методів визначення вмісту важких металів у вугіллі та продуктах вуглевидобутку. Виявлена доцільність використання НВЧ-поля та зниження температури озолення проб для підвищення точності визначення та зниження витрат часу на проведення ...
Chudaeva, G.V., Nazimko, E.I.
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Prediction of Loss on Ignition of Ternary Cement Containing Coal Bottom Ash and Limestone Using Central Composite Design [PDF]
, 2019 The effect of CBA/CBA-L ratio and the cement replacement on the Loss on ignition (LOI) of ternary cement blends was investigated using central composite design approach in the prediction of LOI of ternary cement blend comprising of Ordinary Portland ...
Makarfi, Isa Yusuf +2 more
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Research progress on coal mine laser methane sensor [PDF]
, 2019 This paper discusses the research progress of low-power technology of laser methane sensors for coal mine. On the basis of environment of coal mines, such as ultra-long-distance transmission and high stability, a series of studies have been carried out ...
Grattan, K. T. V. +10 more
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