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22 ensp 0183 ensp University of Mining and Technology Xuz China 2 State Key Laboratory of Coal Resources and Safe Mining Xuzhou China 3 School of Electric Power Engineering China University of Mining and Techno15809994 Liu Ling 1

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13 ensp 0183 ensp China Univ Mining amp Technol Dept Math Beij Peoples R China WOS 000328931400053 Dong HM Electrically controlled nonlinear terahertz optical properties of graphene China Univ Mining amp Technol Dept Phys Xuz Peoples R China

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4 ensp 0183 ensp In the last few articles we spent some time explaining and implementing some of the most important preprocessing techniques in NLP However we

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Optimal submerged waterjet for gas recovery based

1 INTRODUCTION Coalbed methane CBM also known as coal seam gas CSG is a substitute for conventional fuel formed in both low rank and high rank coalbeds 1 According to statistics the CBM reserves with a depth above 2000 m in China are around 36 8 215 1012 m 3 ranking the third largest in the world after Russia and Canada 5 As much more attention paid to industrial safety and

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Dynamic mechanical characteristics and failure mode

The improved split Hopkinson pressure bar SHPB was used to study the dynamic mechanical properties and failure characteristics of surrounding rock in deep rock mass engineering that is under high stress and affected by blasting excavation and other dynamic disturbances In a three dimensional high static load and frequent dynamic disturbance test the preload high axial pressure and

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Quantifying the Impacts of Climate Change Coal

The streamflow has declined significantly in the coal mining concentrated watershed of the Loess Plateau China since the 1970s Quantifying the impact of climate change coal mining and soil and water conservation SWC which are mainly human activities on streamflow is essential not only for understanding the mechanism of hydrological response but also for water resource management in

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Reservoir properties of Chinese tectonic coal A review

The tectonic coal particles underwent secondary forming under geo stress to a coal body which exhibits a low strength weakly cohesive feature compared to the intact coal The tectonic coal is typically easily broken into large quantities of small particles under the disturbance of mining

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A gas outburst prevention and control strategy for

the current situation of highly mechanized mining In this study a three dimensional coal and CBM co extraction strategy was proposed The strategy includes three lev els of three dimensional gas prevention and control methods The first level is the combination of ground and underground gas extraction methods to achieve joint

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Experiment study of compaction characteristics of

To study compaction characteristics of crushed stones,the compaction tests on sandstone,mudstone and sandy mudstone from coal seam roof of Yima Xin an mine were conducted by using RMT–150B

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16 ensp 0183 ensp Mining of a protective coal layer will result in the breakage and movement of the overlying strata as well as floor heaves in the floor strata In these unloaded coal strata relieving the stress leads to the production of new cracks which increases the permeability

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6 ensp 0183 ensp Physical Review E Statistical Nonlinear and Soft Matter Physics 3 Analysis of intercellular calcium signaling using microfluidic adjustable laminar flow for localized chemical stimulation

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Test results showed that the scoop type replant seed metering systems equipped with variable speed when the rotation speed was 13 9 23 1 r min drain sowing rate was not exceeded 1 4 the average replant rate was 89 95 seeding rate reached 98 7 at

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