Chemical Analyses and Physical Properties of 12 Coal ...
The 12 coal channel samples were obtained from 5 coal beds that span about 244 m or 800 ft of stratigraphic section in the Pocontas and New River Formations of Early Pennsylvanian age.
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The 12 coal channel samples were obtained from 5 coal beds that span about 244 m or 800 ft of stratigraphic section in the Pocontas and New River Formations of Early Pennsylvanian age.
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mechanical jack,railway jack. Comprises a base, a lift hook, a handle pressing handle, a pawl, a jack, a fast dropping wheel, the lifting hook is set on the rack, and constitute a sliding fit with the rack, one end of the handle and the pressing handle hinged hook lift, the pawl is fixed on the pressure in the handle, and the other end engaged with the rack, fixed to the lifting ...
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The impact and collision behavior between the coal gangue and the hydraulic support widely exists in the top coal caving. However, due to the complex interactions between the large number of coal gangue particles in the mining surface and the limitations of the coal mining technology and other factors, it becomes a difficult problem to study the collision behavior and the contact response ...
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