Google的产品与制度的网络经济分析

在人类的商务活动中网络正在扮演日益重要的角色,网上无限丰富的信息资源和用户资源,不仅能使使用者降低经济活动的交易成本,而且可以获得不可估量的巨大经济利益.在国际互联网搜索行业中,Google 代表着登峰造极的最高水准.Google靠着技术起家,创新制胜,处处求新改变,已经让Google品牌深入人心,成为搜索的代名词.文章简要介绍了google的产品和制度,网络经济的内涵与特征,然后阐述在google在网络经济的发展,最后探讨google如何加强自己的网络经济地位.     

云计算环境下的“多媒体技术”课程设计与实践

本文通过以建立《多媒体技术》课程辅助教学平台为例,详细阐述了云计算环境下如何使用google云,建立辅助教学平台,包括运用Google sites、Google文档、Google的Picasa网络相册、Google Group等服务,以更好地服务教学,促进教育信息化的发展。     

The effect of college education on intolerance: evidence from Google search data

This article explores the causal relationship between college education within a region and that region’s interest in hate-related topics. I utilize Google Trends search data for intolerance-related terms to measure regional interest in intolerance, and an instrumental variable based on the historical assignment of land grant colleges to obtain exogenous variation in cross-regional college-educated population shares. I find that there is a negative correlation between a region’s college-educated population share and that region’s search activity for intolerance-related terms. This correlation does not translate to a causal relationship, however, as the instrumental variables estimates are found to be small and statistically insignificant. This finding suggests that improving access to college-level education may not be an effective policy tool to combat hateful attitudes and behaviour.     

基于GEE的淮南市土地利用变化对生态系统服务价值的影响

以淮南市为研究区,基于谷歌地球引擎(GEE)云平台获取的土地利用数据和修正的当量因子表,分析2010—2018年淮南市生态系统服务价值(ESV)的时空变化,以期探究淮南市煤炭开采对ESV的影响,为淮南市可持续发展提供决策依据。结果表明:2010—2018年,淮南市的耕地面积减少,建设用地和水域面积增加,其他土地利用类型变化幅度较小;淮南市ESV呈增长趋势,由2010年的98.37亿元增长到了2018年的119.64亿元;基于1 km×1 km的格网尺度对淮南市ESV进行分析发现:淮南市ESV低值区面积减少,较低、中等、较高、高等级的面积均呈上升趋势;各土地利用类型价值系数的敏感性指数均小于1,说明研究结果具有可靠性;淮南市ESV与累计原煤产量有较高的相关性,两者相关系数R2为0.8546。     

Relevance of the Attention Effect in the Brazilian Stock Market

This article aims to analyze the impact of investor attention in the Brazilian stock market, particularly the effect of positive pressure on asset prices verified by Barber and Odean (2008 Barber, B. M., &; Odean, T. (2008). All that glitters: The effect of attention and news on the buying behavior of individual and institutional investors. Review of Financial Studies, 21(2), 785–818. doi:10.1093/rfs/hhm079[Crossref], [Web of Science ®] , [Google Scholar]). Using the methodology of Da and colleagues (2011 Da, Z., Engelberg, J., &; Gao, P. (2011). In search of attention. The Journal of Finance, 66(5), 1461–99. doi:10.1111/j.1540-6261.2011.01679.x[Crossref], [Web of Science ®] , [Google Scholar]), we seek to assess whether investor attention, as measured by the volume of searches on Google, can explain abnormal variations in market activity and asset returns. The results indicated that the Internet search data does explain variations in turnover rate and trading volume of assets. However, unlike the results of studies conducted in other countries, the price pressure hypothesis was not observed in the Brazilian market.