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Topic evolution is an important research task for Topic Detection and Tracking (TDT), studying how the topics evolve over time on textual data. On the web forum, topics are often interactive, which means that new topics emerge and old ones decay and the number of topics is always in a dynamic change. This paper presents an on-line adaptive topic evolution model based on Latent Dirichlet Allocation...
Ten unsaturated alkylamides were isolated from the pericarps of Zanthoxylum bungeanum. Three of them identified as (2E,4E)-2 -hydroxy-N-isobutyl-2,4-tetradecadienamide (named tetrahydrobungeanool), (2E,4E,8Z)-2 -hydroxy-N-isobutyl-2,4,8-tetradecatrienamide (named dihydrobungeanool) and (2E,4E,8Z,10E,12E)-1 -isopropenyl-N-(2 -bisobutenyl)-2,4,8,10,12-tetradeca pentaenamide (named dehydro-γ-sanschool),...
Two new flavonol glucosides, viz. quarcetin 3 ,4 -dimethyl ether 7-glucoside and tamarixetin 3,7-bisglucoside, together with hyperin, quercetin, quercitrin, foeniculin, isorhamnetin 7-glucoside, rutin, 3,5,6-trihydroxy-7,4 -dimethoxyflavone, arbutin, sitosterol β-glucoside, l-sesamin and palmitic acid were isolated from the pericarps of Zanthoxylum bungeanum. Their structures were established...
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