Ya-nan Qiao

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There is an implied assumption for keywords in the traditional Information Retrieval (IR) models: keywords are parallel to each other. In fact, there are some relations between terms in quite a few queries, and in these queries, perhaps one term is subordinate to another term according to the inner meanings of information needs. This is “Higher-order(More)
Seven new ent-eudesmane-type sesquiterpenoids (1-7) and six known analogues (8-13) were isolated from the Chinese liverwort Chiloscyphus polyanthus var. rivularis. Their structures were determined from analysis of MS and NMR spectroscopic data and single-crystal X-ray diffraction. A cytotoxic evaluation showed that compound 1 exhibited weak inhibitory(More)
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