[目的/意义]微博作为一种重要的信息传播载体,在疫情信息发布与传播中发挥着重要作用。深入分析疫情信息中蕴含的疫情事件及其对网民情绪的影响,有助于各级政府准确掌握网络舆论情况,科学高效地做好防控宣传和舆情引导工作。[方法/过程...[目的/意义]微博作为一种重要的信息传播载体,在疫情信息发布与传播中发挥着重要作用。深入分析疫情信息中蕴含的疫情事件及其对网民情绪的影响,有助于各级政府准确掌握网络舆论情况,科学高效地做好防控宣传和舆情引导工作。[方法/过程]以新冠肺炎疫情相关的微博新闻及其评论作为研究对象,利用条件随机场(Conditional Random Field,CRF)模型从微博新闻中抽取疫情事件并建立疫情事件画像;在情感词典的基础上,引入双向长短期记忆网络(Bidirectional Long Short-Term Memory,Bi-LSTM)模型建立网民情绪画像;利用基于自注意力机制的Bi-LSTM模型对疫情事件与网民情绪进行关联分析。[结果/结论]真实语料集上的实验结果表明,围绕捐资、防控、临床和英雄等主题,CRF模型疫情事件抽取的F值均达到73%以上,Bi-LSTM模型网民情绪识别的F值均在70%以上,基于注意力机制的Bi-LSTM模型给出的网民情绪分布基本符合疫情发展态势。展开更多
The Carboniferous period lasted about 60 Myr, from ～358.9 Ma to ～298.9 Ma. According to the International Commission on Stratigraphy, the Carboniferous System is subdivided into two subsystems, i.e., Mississippian a...The Carboniferous period lasted about 60 Myr, from ～358.9 Ma to ～298.9 Ma. According to the International Commission on Stratigraphy, the Carboniferous System is subdivided into two subsystems, i.e., Mississippian and Pennsylvanian, including 6 series and 7 stages. The Global Stratotype Sections and Points(GSSPs) of three stages have been ratified, the Tournaisian, Visean, and Bashkirian stages. The GSSPs of the remaining four stages(i.e., the Serpukhovian, Moscovian,Kasimovian, and Gzhelian) have not been ratified so far. This paper outlines Carboniferous stratigraphic subdivision and correlation on the basis of detailed biostratigraphy mainly from South China, and summarizes the Carboniferous chronostratigraphic framework of China. High-resolution biostratigraphic study reveals 37 conodont zones, 24 foraminiferal(including fusulinid) zones, 13 ammonoid zones, 10 brachiopod zones, and 10 rugose coral zones in the Carboniferous of China. The biostratigraphic framework based on these biozones warrants the precise correlation of regional stratigraphy of China(including2 subsystems, 4 series, and 8 stages) to that of the other regions globally. Meanwhile, the Carboniferous chemo-, sequence-,cyclo-, and event-stratigraphy of China have been intensively studied and can also be correlated worldwide. Future studies on the Carboniferous in China should focus on(1) the correlation between shallow-and deep-water facies and between marine and continental facies,(2) high-resolution astronomical cyclostratigraphy, and(3) paleoenvironment and paleoclimate analysis based on geochemical proxies such as strontium and oxygen isotopes, as well as stomatal indices of fossil plants.展开更多
文摘[目的/意义]微博作为一种重要的信息传播载体,在疫情信息发布与传播中发挥着重要作用。深入分析疫情信息中蕴含的疫情事件及其对网民情绪的影响,有助于各级政府准确掌握网络舆论情况,科学高效地做好防控宣传和舆情引导工作。[方法/过程]以新冠肺炎疫情相关的微博新闻及其评论作为研究对象,利用条件随机场(Conditional Random Field,CRF)模型从微博新闻中抽取疫情事件并建立疫情事件画像;在情感词典的基础上,引入双向长短期记忆网络(Bidirectional Long Short-Term Memory,Bi-LSTM)模型建立网民情绪画像;利用基于自注意力机制的Bi-LSTM模型对疫情事件与网民情绪进行关联分析。[结果/结论]真实语料集上的实验结果表明,围绕捐资、防控、临床和英雄等主题,CRF模型疫情事件抽取的F值均达到73%以上,Bi-LSTM模型网民情绪识别的F值均在70%以上,基于注意力机制的Bi-LSTM模型给出的网民情绪分布基本符合疫情发展态势。
基金supported by the Chinese Academy of Sciences (Grant Nos. XDB26000000, 18000000 and XDPB05)the National Natural Science Foundation of China (Grant No. 41290263)and the Ministry of Science and Technology of China (Grant No. 2013FY111000)
文摘The Carboniferous period lasted about 60 Myr, from ～358.9 Ma to ～298.9 Ma. According to the International Commission on Stratigraphy, the Carboniferous System is subdivided into two subsystems, i.e., Mississippian and Pennsylvanian, including 6 series and 7 stages. The Global Stratotype Sections and Points(GSSPs) of three stages have been ratified, the Tournaisian, Visean, and Bashkirian stages. The GSSPs of the remaining four stages(i.e., the Serpukhovian, Moscovian,Kasimovian, and Gzhelian) have not been ratified so far. This paper outlines Carboniferous stratigraphic subdivision and correlation on the basis of detailed biostratigraphy mainly from South China, and summarizes the Carboniferous chronostratigraphic framework of China. High-resolution biostratigraphic study reveals 37 conodont zones, 24 foraminiferal(including fusulinid) zones, 13 ammonoid zones, 10 brachiopod zones, and 10 rugose coral zones in the Carboniferous of China. The biostratigraphic framework based on these biozones warrants the precise correlation of regional stratigraphy of China(including2 subsystems, 4 series, and 8 stages) to that of the other regions globally. Meanwhile, the Carboniferous chemo-, sequence-,cyclo-, and event-stratigraphy of China have been intensively studied and can also be correlated worldwide. Future studies on the Carboniferous in China should focus on(1) the correlation between shallow-and deep-water facies and between marine and continental facies,(2) high-resolution astronomical cyclostratigraphy, and(3) paleoenvironment and paleoclimate analysis based on geochemical proxies such as strontium and oxygen isotopes, as well as stomatal indices of fossil plants.
