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Thermal fragmentation of Jixi bituminous coal was analyzed by using a bench-scaled fixed bed. The results show specific characteristics of fragmentation during pyrolysis at 750-850??C. Raising temperature favors increasing the fragmentation ratio (Nf) and the fragmentation index (Sf), while hardly benefits the primary fragmentation rate (Pf) going up. With particles increasing, Particles of 6-8 mm...
In this article, a novel mixed index strategy for real-time update is presented. The strategy combines the inverted file with a structure index and implements the retrieval of both context and structure in an XML collection. It can be effectively used to optimize the query of path expression, decrease the number of update operations, accelerate the process of real-time update and shorten the response...
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