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We analyzed the stability of the retained gob-side entry in four different Chinese coal mining sites and evaluated the influencing factors of roadway deformation such as mining depth, support strength and area of gob-side hanging roof. It was found that the length of cantilever roof block above roadway has a major impact on the deformation, whereas the(More)
The study describes the cloud computing-based multimedia database and the different traditional database, object-oriented database model of the concept, discusses the cloud-based object-oriented multimedia database of two ways, and summarized the characteristics of such multimedia database model, superiority and development.
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