The paper emphatically analyses the interaction between the wall stress characteristic and coalgetting by impact on the longwall face, proposes the work pattern of coal breaking by impact.
看重分析了长壁采煤工作面煤壁应力特点和冲击劈裂式采煤的相互作用关系,提出了冲击破煤的作业方式。
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Veolia doesn't run big coal or nuclear power plants - instead, it tries to deliver "efficiency" - basically getting more out of the electricity grid.
In 2004, the shortage was primarily the result of not enough rail lines, so coal was not getting to generating stations.Moreover, there were too few power plants as well.