Data on discrete,isolated attributes of the marine economy are often used in traditional marine economic research.However,as the focus of urban research shifts from internal static attributes to external dynamic linka...Data on discrete,isolated attributes of the marine economy are often used in traditional marine economic research.However,as the focus of urban research shifts from internal static attributes to external dynamic linkages,the importance of marine economic net-work research is beginning to emerge.The construction of the marine economic network in China’s coastal areas is necessary to change the flow of land and sea resources and optimize regional marine economic development.Employing data from headquarters and branches of sea-related A-share listed enterprises to construct the marine economic network in China,we use social network analysis(SNA)to discuss the characteristics of its evolution as of 2010,2015,and 2020 and its governance.The following results were obtained.1)In terms of topological characteristics,the scale of the marine economic network in China’s coastal areas has accelerated and expan-ded,and the connections have become increasingly close;thus,this development has complex network characteristics.2)In terms of spatial structure,the intensity of the connection fluctuates and does not form stable development support;the group structure gradually becomes clear,but the overall pattern is fragmented;there are spatial differences in marine economic agglomeration radiation;the radi-ation effect of the eastern marine economic circle is obvious;and the polarization effect of northern and southern marine economic circles is significant.On this basis,we construct a framework for the governance of a marine economic network with the market,the government,and industry as the three governing bodies.By clarifying the driving factors and building objectives of marine economic network construction,this study aims to foster the high-quality development of China’s marine economy.展开更多
目的明确深圳市罗湖区某幼儿园一起疱疹性咽峡炎(herpangina,HA)混合手足口病(hand,foot and mouth disease,HFMD)聚集性疫情的流行病学特征,分析疫情持续传播的因素,为制定有效的防控措施提供科学依据。方法应用现场流行病学方法整理...目的明确深圳市罗湖区某幼儿园一起疱疹性咽峡炎(herpangina,HA)混合手足口病(hand,foot and mouth disease,HFMD)聚集性疫情的流行病学特征,分析疫情持续传播的因素,为制定有效的防控措施提供科学依据。方法应用现场流行病学方法整理分析疫情相关资料,在疫情接报和持续传播阶段分别采集病例咽拭子、肛拭子以及环境样本检测肠道病毒核酸及基因分型。结果本起疫情共持续42d,报告115例病例,无重症、住院及死亡病例。其中HA 86例,HFMD 11例,其他18例。幼儿园整体罹患率为20.7%(115/555),其中教学楼二楼儿童罹患率为27.5%(57/207),与一楼相比差异具有统计学意义(RR=1.824,95%CI:1.187~2.804)。实验室检测发现前后两次采样的病原体型别不同。疫情持续传播可能与社区密切接触、首诊误诊、晨检不规范、游园活动等因素有关。结论这是一起由多个传播源头引起的HA混合HFMD聚集性疫情。既有社区到幼儿园的传播,也存在幼儿园跨班级间传播。建议校园传染病防控增加居家隔离观察期,以防疫情持续传播。展开更多
基金Under the auspices of the Key Research Base of Humanities and Social Sciences of the Ministry of Education of China(No.22JJD790029)。
文摘Data on discrete,isolated attributes of the marine economy are often used in traditional marine economic research.However,as the focus of urban research shifts from internal static attributes to external dynamic linkages,the importance of marine economic net-work research is beginning to emerge.The construction of the marine economic network in China’s coastal areas is necessary to change the flow of land and sea resources and optimize regional marine economic development.Employing data from headquarters and branches of sea-related A-share listed enterprises to construct the marine economic network in China,we use social network analysis(SNA)to discuss the characteristics of its evolution as of 2010,2015,and 2020 and its governance.The following results were obtained.1)In terms of topological characteristics,the scale of the marine economic network in China’s coastal areas has accelerated and expan-ded,and the connections have become increasingly close;thus,this development has complex network characteristics.2)In terms of spatial structure,the intensity of the connection fluctuates and does not form stable development support;the group structure gradually becomes clear,but the overall pattern is fragmented;there are spatial differences in marine economic agglomeration radiation;the radi-ation effect of the eastern marine economic circle is obvious;and the polarization effect of northern and southern marine economic circles is significant.On this basis,we construct a framework for the governance of a marine economic network with the market,the government,and industry as the three governing bodies.By clarifying the driving factors and building objectives of marine economic network construction,this study aims to foster the high-quality development of China’s marine economy.
