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It is well-known that natural weathering processes can change the surface properties of coal. The carbon content on the coal surface can be reduced, while the oxygen content can be increased, by natural weathering processes. However, there is little direct and deep research into the effect of natural weathering processes on the size and density compositions of coal. In this investigation, the changes in the size and density compositions of bituminous coal before and after natural weathering processes were discussed. X-ray photoelectron spectroscopy and scanning electron microscopy measurements were used to explain these changes in micro aspects. Throughout this paper, both the size and density compositions of bituminous coal could be affected by natural weathering processes. Natural weathering processes not only reduce the coal particle size but also increase the coal particle density.

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This paper briefly describes the importance, particularity and specificity of mine equipment safety inspection. It also introduces the requirements of the safety inspection information system for mine equipment, of which the exploitation process is normalized by the Unified Modeling Language (UML) technique. The goal of this paper is to present a scheme to design and integrate modeling the safety inspection information system. We adopt the five steps to design the scheme, and the design scheme of the system is made up of activity diagrams, package diagrams, use case diagrams, sequence diagrams, deployment diagrams using UML. The scheme can provide certain reference values for designers, developers, and architects to analysis and design of related information system.