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《Research Policy》2023,52(1):104631
This paper studies the relationship between migration and the productivity of high-skilled workers, as captured by inventors of international patent applications. Using machine learning techniques to uniquely identify inventors across patents, we are able to track the migration patterns of nearly one million individual inventors across countries. Migrant inventors account for more than nine percent of inventors in our sample. The econometric analysis seeks to explain the recurring finding in the literature that migrant inventors are more productive than non-migrant inventors. We find evidence that migrant inventors become about twenty-three percent more productive after having migrated. The disambiguated inventor data are openly available. 相似文献
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This paper analyzes major patterns and trends in entrepreneurship among technology-based university alumni since the 1930s by asking two related research questions: (1) Who enters entrepreneurship, and has this changed over time? (2) How does the rate of entrepreneurship vary with changes in the entrepreneurial business environment? We describe findings based on data from two linked datasets joining Massachusetts Institute of Technology (MIT) alumni and founder information. New company formation rates by MIT alumni have grown dramatically over seven decades, and the median age of first time entrepreneurs has gradually declined from about age 40 (1950s) to about age 30 (1990s). Women alumnae lag their male counterparts in the rate at which they become entrepreneurs, and alumni who are not U.S. citizens enter entrepreneurship at different (usually higher) rates relative to their American classmates. New venture foundings over time are correlated with measures of the changing external entrepreneurial and business environment, suggesting that future research in this domain may wish to more carefully examine such factors. 相似文献
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浙教版九年级数学《1.3反比例函数的应用》,教学内容主要为两道例题,其中例2教学中由于图形特征不够明显,而使学生产生＂异议＂,笔者遵循学生的异议,通过师生探究,成功解决＂争端＂,并得到快速辨别一次函数、反比例函数的数字模型。 相似文献
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在战场上将部队调动到指定位置从来都是个难题，这一点即使是在技术高度发达的今天也同样如此。在今天，发生冲突的地点可能远在几千千米之外，尽管有巨型运输机等先进装备。但在复杂的世界政治格局下，政治上的障碍几乎和距离上的一样巨大。为了通过他国领空，需要进行漫长而艰苦的谈判。就算最后谈判取得成功，可能战机也已经一去不返。因此快速的部队调动能力一直是各个国家的军队指挥官梦寐以求的，这一点就是号称装备精良的美军也不例外。[第一段] 相似文献
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胡德海先生以独特的思维方式和方法,较高的抽象思维和思辨能力去选择中、西文化现有的思想成果,塑造出一种新的、富有创见的、思维缜密的教育学理论体系,形成了他的教育学思想,其中涵盖了哲学、文化学和人类学、系统论、进化论、结构学、结构主义、人本学等思想理论,体现了其独特的学术造诣。 相似文献
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胡德海先生以独特的思维方式和方法,较高的抽象思维和思辨能力去选择中、西文化现有的思想成果,塑造出一种新的、富有创见的、思维缜密的教育学理论体系,形成了他的教育学思想,其中涵盖了哲学、文化学和人类学、系统论、进化论、结构学、结构主义、人本学等思想理论,体现了其独特的学术造诣。 相似文献
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