基于LDA主题模型的中国图书出口效果研究——以亚马逊海外读者评论为例

中华文化通过图书走向世界舞台,是提高国家文化软实力、讲好中国故事、塑造良好国家形象的有效途径。通过Python语言工具对美国亚马逊网站上的中国图书评论数据进行分析,构建LDA主题模型,探讨中国图书出口效果,深入挖掘海外读者对中国出口图书的认知评价。研究发现,海外读者对中国图书的关注点集中于内容评价、翻译理解、服务体验、中国元素、题材情节5个方面。针对以上关注点,从图书内容、出版传播、读者反馈等角度提出了具有实践价值的建议,为推动中国图书高质量出口提供了理论参考和解决思路。

Lightning Enhancement in the Amazon Region Due to Urban Activity

Urbanization has an increasing contribution to anthropogenic climate forcing. The impact arises mainly from the Urban Heat Island (UHI) effect and aerosol anthropogenic emissions. An important but not completely understood consequence of this forcing is its effect on local lightning activity. Changes in lightning activity may result in a feedback on the climate system. In this article, it investigates changes in the lightning activity in the city of Manaus, located in the Amazon region of Brazil. It is found that, over the city, the lightning activity is larger than in the regions around it and it has been increasing in the last four decades simultaneously with the increasing of its urban area. Our results suggest that such changes are caused by the UHI effect. The observations reported here are unique and relevant because Manaus is located in the central part of the Amazon rainforest and inside one of the three global lightning chimneys in the world.

大科技企业的争议与治理:研究回顾与实践启示

大科技企业是数字经济时代大企业的典型代表。已有的研究和实践表明,大科技企业表现出了不同于既往通信、化工巨头的特征,特别是其具有的平台经济、数字生态商业模式,以及数据在其生产过程、消费过程中所发挥的独特作用,使得大科技企业的影响范围更广、影响维度更为复杂。面对大科技企业引发的争议以及全球科技监管趋严的背景,大科技企业对于数字经济高质量发展和创新引领的作用同样不容忽视。以大科技企业为核心构建的数字生态,进一步促进了中小企业融通发展,推动了数字化转型。未来,须平衡好大科技企业的治理目标,采取“守门人”制度、分级分类监管等动态监管方式,以进一步发挥大科技企业的正面作用,加快数字经济的高质量发展。