全球地球科学研究的可视化分析
艾鑫1,2(
),马明国1,2,王雪梅3,匡鸿海2()
),马明国1,2,王雪梅3,匡鸿海2()
A Visual Analysis of Global Geoscience Research
Xin Ai1,2(),Mingguo Ma1,2,Xuemei Wang3,Honghai Kuang2()
),Mingguo Ma1,2,Xuemei Wang3,Honghai Kuang2()
图5. 1994—2018年不同发文分级中包含的国家数量图
Fig.5. The number of countries included in different article grades from 1994 to 2018
