In the event extraction task, considering that there may be multiple scenarios in corpus and an argument play different roles under triggers, traditional tagging scheme can only tag each word once, which cannot solve problem of overlap. A hierarchical pipeline model for Chinese based on pretrained Bert was proposed, obtain relevant arguments a way. The structure is selected model, task divided ...

In this work, a new extraction method termed aerosol phase extraction has been developed for the first time. The new method was based on the nebulisation of the sample onto the extracting solution to maximize the contact surface. The influential parameters are: agitation time, chelating agent concentration and inorganic acid concentration. The method has been applied to the extraction of molybd...