(En-)‘lightening’ children: Assessing the impacts of access to electricity on learning achievement levels

The welfare impacts of electrification are well documented in the literature, including the effects of electricity on school enrolment. However, the spillover effects of electrification on children's achievement levels are scarce. We use three complementary but distinct econometric models to establish a causal relationship between electrification and test scores using nationally representative household panel data from India. We find positive results irrespective of the choice of econometric model, and these results seem to be mediated by changing time-use patterns of children with access to electricity. We first exploit the plausibly exogenous variation in access to electricity due to a universal electrification program in the state of West Bengal in India and we find positive effects of electrification on children's test scores. By age group, we find that younger cohorts benefit more in terms of their reading scores than older cohorts. Then, to ascertain external validity of these results, we replicate them over a nationally representative sample using fixed effects and instrumental variables estimation and find similar results. At the intensive margin, we find that access to more hours of electricity positively affects test scores. We identify an increase in time spent by children on study-related activities as the potential channel for these results.     

Technology licensing and collusion

This paper considers the possibility of technology licensing via fixed-fee, royalty or two-part tariff and tacit collusion between firms that produce homogeneous goods under asymmetric cost structures and compete in quantities. In contrast to Lin (1996), all forms of licensing facilitate (obstruct) collusion, if the initial cost difference between the firms is relatively less (more). Technology will always be licensed, and the optimal form of licensing is either fixed-fee or royalty or two-part tariff, but collusion may or may not be possible post-licensing. Welfare decreases after licensing if the firms collude only after licensing but not collude under no-licensing.     

基于GC-MS技术对钩吻碱食物中毒的应急检测

目的:对一起食物中毒事件中毒因子进行应急检测,为患者救治及做好此类中毒的检测提供参考和依据.方法:样品经10％NaOH溶液超声提取10 min,三氯甲烷液液萃取,微孔滤膜净化,采用气相色谱-串联质谱Scan模式全扫描,Nist17谱库检索定性,比对标准品和样品质谱图离子丰度比确证、SIM模式下外标法定量.结果:洗胃液、...     

Book Review: “Oligopoly,Auctions and Market Quality” by Krishnendu Ghosh Dastidar

Journal of Quantitative Economics -     

以合作学习教学法提高学生实验创新能力的行动研究

合作学习作为一种教育技术手段，它在培养学生的合作意识、团队精神、批判性思维，以及学生的动手实践及创新能力等方面有独特的价值。将合作学习运用于《风电检测技术与控制》课程的创新性实验教学中，注意培养学生的合作技能，并从行动研究方面，观察学生在活动中能否尊重他人，注意聆听，是否具备恰当的口语表述等社交技能，从而给予适时的指引及鼓励，建构出属于学生自己的观点，以提高他们的科学素养。同时，研究探索在合作学习教学活动中，最大阻力和困难来源以及产生的原因；对学生的实验设计及创新能力是否有所改善。