COVID-19国际科研合作网络特征及演变研究

 目的 通过对2019冠状病毒病（coronavirus disease 2019，COVID-19）的国际科研合作网络进行深入分析，为研究人员掌握研究现状和探索合作路径提供参考。方法 基于Web of Science核心合集的ESI高被引论文数据，将纳入文献按出版时间分为4个阶段，利用多元统计和社会网络分析方法，揭示COVID-19国际科研合作率、科研合作团队规模、合作网络特征及其演变规律。结果 截至2021年4月30日，检索得到ESI高被引论文3 794篇，根据文献筛选标准，共纳入3 715篇作为研究样本。国际总体科研合作率达到34.27%，发文量最多的10个国家中，中国合作率最低（34.53%），其余国家均超过50%，中美两国的合作率在4个阶段中呈逐步下降趋势。科研合作团队规模整体呈上升趋势，在整个科研合作网络中，第二阶段规模最大、紧密程度最高，此后网络规模呈缩小趋势。合作网络不断呈向中心聚集状态，中国在第一阶段的核心度是0.741，位于核心位置，从第二阶段开始美国代替中国，一直是合作网络的核心，英国则排在第二位。结论 COVID-19国际科研合作程度整体较高，合作网络逐渐呈向心聚集趋势，美国仍是合作网络的核心。

Research on the characteristics and evolution of international scientific research collaboration network of COVID-19

Objective To analyze the international scientific research collaboration network of coronavirus disease 2019 (COVID-19), and provide reference for researchers to grasp the research status and explore collaborative paths in future. Methods The ESI highly cited papers on COVID-19, which were collected from the core collection of Web of Science, were divided into four stages according to the publication time, and the multivariate statistics and social network analysis were used to reveal the international research collaboration rate, team size, collaboration network characteristics and its evolution rule. Results Up to Apr 30, 2021, a total of 3 794 ESI highly cited papers were initially collected. According to the literature screening criteria, 3 715 papers were finally included in the current research. The overall international research collaboration rate reached 34.27%. Among the 10 countries with the highest number of papers published, China had the lowest research collaboration rate (34.53%) with other countries, and the rests were more than 50%. The collaboration rate between China and the United States showed a gradual downward trend in the four stages. The overall scientific research team size showed an upward trend in general. In the entire scientific research collaboration network, the second stage was the largest and the most compact one, Since then the network scale became shrinking, and the collaboration network had been gathering to the center. The core degree of China in the first stage was 0.741, indicating that China was at the core position. Since then the United States replaced China and became the core of the scientific research collaboration network, and England came in second. Conclusion The overall level of international scientific research collaboration of COVID-19 is high, and the collaboration network presents a trend of centripetal aggregation. The United States is still the core of the collaboration network.