Polder is a type of irrigation field unique to the lower Yangtze River of China.It is a product of long-term and ingenuous human modifications of wetland landscapes.In the pre-Qin Period,3000 years ago,the poldered ar...Polder is a type of irrigation field unique to the lower Yangtze River of China.It is a product of long-term and ingenuous human modifications of wetland landscapes.In the pre-Qin Period,3000 years ago,the poldered area of eastern Wuhu city was once a large lake called the ancient Danyang wetland.The introduction of agricultural civilization and polder technology to the area during the Wu and Yue Kingdoms period gradually transformed it into an agricultural area.With an accelerating rate of land reclamation under a changing late-Holocene regional climate,the ancient Danyang wetland became an aquatic system strongly influenced by intensifying anthropogenic activities.In this study,based on field survey data,historical documents,and remote-sensing and archaeological data,we reconstructed the spatial distribution of the polder landscape over the last 3000 years and identified their structural diversity.We found that polder landscapes began to emerge in the Spring and Autumn Period,land reclamation intensified in the Three Kingdoms and developed rapidly in the Song Dynasty before eventually reaching the peak from the Ming and Qing Dynasties.The relocation of historical sites to low-altitude areas also marked the expansion of poldered fields from the center of the wetland to the southeast and northwest.The development and evolution of the polder landscape are related to regional climate conditions,changing social and economic statuses,and the development of agricultural technology in the Song Dynasty and succeeding periods.展开更多
针对恐怖袭击事件文本语料库匮乏的问题,文章制定了恐怖袭击事件的实体标注规范,通过对全球恐怖主义数据库(GTD)的数据进行实体标注,构建了恐怖袭击事件的实体语料库。同时,针对数据标注工作的高人力和高时间成本问题,由于百度通用信息...针对恐怖袭击事件文本语料库匮乏的问题,文章制定了恐怖袭击事件的实体标注规范,通过对全球恐怖主义数据库(GTD)的数据进行实体标注,构建了恐怖袭击事件的实体语料库。同时,针对数据标注工作的高人力和高时间成本问题,由于百度通用信息抽取(Universal Information Extraction,UIE)模型在极小样本上具有较强的泛化能力,采用UIE模型进行辅助标注。实验结果证明了标注方案的有效性,并在一定程度上减少了标注时间。展开更多
基金National Natural Science Foundation of China,No.42271173,No.41771221Key Project of the 14th Five-Year Plan of Anhui,No.2022BFAFZ01365National Key Program of Innovation Training for College Students,No.202310370039,No.202310370049,No.S202310370332。
文摘Polder is a type of irrigation field unique to the lower Yangtze River of China.It is a product of long-term and ingenuous human modifications of wetland landscapes.In the pre-Qin Period,3000 years ago,the poldered area of eastern Wuhu city was once a large lake called the ancient Danyang wetland.The introduction of agricultural civilization and polder technology to the area during the Wu and Yue Kingdoms period gradually transformed it into an agricultural area.With an accelerating rate of land reclamation under a changing late-Holocene regional climate,the ancient Danyang wetland became an aquatic system strongly influenced by intensifying anthropogenic activities.In this study,based on field survey data,historical documents,and remote-sensing and archaeological data,we reconstructed the spatial distribution of the polder landscape over the last 3000 years and identified their structural diversity.We found that polder landscapes began to emerge in the Spring and Autumn Period,land reclamation intensified in the Three Kingdoms and developed rapidly in the Song Dynasty before eventually reaching the peak from the Ming and Qing Dynasties.The relocation of historical sites to low-altitude areas also marked the expansion of poldered fields from the center of the wetland to the southeast and northwest.The development and evolution of the polder landscape are related to regional climate conditions,changing social and economic statuses,and the development of agricultural technology in the Song Dynasty and succeeding periods.
文摘针对恐怖袭击事件文本语料库匮乏的问题,文章制定了恐怖袭击事件的实体标注规范,通过对全球恐怖主义数据库(GTD)的数据进行实体标注,构建了恐怖袭击事件的实体语料库。同时,针对数据标注工作的高人力和高时间成本问题,由于百度通用信息抽取(Universal Information Extraction,UIE)模型在极小样本上具有较强的泛化能力,采用UIE模型进行辅助标注。实验结果证明了标注方案的有效性,并在一定程度上减少了标注时间。
