“呀呀语”音高母语倾向之实验研究

本项研究通过对2名长沙儿童的长期跟踪调查研究得来的实验数据进行语音实验和量化分析对比,发现儿童呀呀语阶段的音高模式呈现目标语成人语言的声调特征。实验证明了声调语言环境中的儿童呀呀语音高发展受目标语声调的影响并呈现一定的规律,有力的反驳了雅柯布森非连贯性假设。     

CRITICAL PERIODS DURING CHILDHOOD AND ADOLESCENCE

We identify the ages that constitute sensitive (or critical) periods in children's development towards their adult health status, skills, and human capital. For this, we use data on families migrating into Sweden from countries that are poorer, with less healthy conditions. Late‐life health is proxied by adult height and other adult outcomes. The relation between siblings’ ages at migration and their adult outcomes allows us to estimate the causal effect of conditions at specific childhood ages. We effectively exploit that, for siblings, the migration occurs simultaneously in calendar time but at different developmental stages (ages). We find evidence that the period just before the puberty growth spurt constitutes a critical period for adult height and we find related critical periods for adult cognition, mental health, and education.     

新型光照培养箱控制系统设计与实现

设计了一种新型光照培养箱控制系统,论述了该系统主要硬件与软件的实现方法.     

A Causality Analysis of Economic Growth and Union Density in European Countries

In this paper, we analyse the relationship between union density and economic growth using a Granger causality analysis and shocks analysis with vector autoregression model. We find that the Granger causality goes from the growth rate to the unionization rate in four of the 11 European countries under study. France bucks the trend: it is the only country in which union density influences economic growth, moreover in a positive way.     

CREDIT CONSTRAINTS AND THE CYCLICALITY OF R&D INVESTMENT: EVIDENCE FROM FRANCE

We use a French firm‐level data set containing 13,000 firms over the period 1994–2004 to analyze the relationship between credit constraints and firms’ R&D behavior over the business cycle. Our main results can be summarized as follows: (i) R&D investment is countercyclical without credit constraints, but it becomes procyclical as firms face tighter credit constraints; (ii) this result is only observed for firms in sectors that depend more heavily upon external finance, or that are characterized by a low degree of asset tangibility; (iii) in more credit‐constrained firms, R&D investment plummets during recessions but does not increase proportionally during upturns.     

明末清初西学东渐史上的《穷理学》

南怀仁编纂的《穷理学》在明末清初西学东渐史上具有重要的地位及意义，它所传入的学科知识体系基本上是南怀仁早年在欧洲耶稣会学校所学到的学科知识体系，主要包含亚里士多德的形式逻辑学、16—17世纪以欧几里得几何学为核心的西方数学以及各门自然科学技术知识。这种学科知识体系具有重视系统性、突出亚里士多德所阐述的形式逻辑的重要作用、强调数学乃一切科学技术的理论和应用基础等基本特征。把《穷理学》置于明末清初西学东渐的历史脉络和文化语境中进行考察，有助于揭示该书所传入的学科知识体系的基本特征及意义，对认识明末清初西学东渐跨文化交流所具有的某些特点也不无裨益。     

多路多功能数据采集系统设计

介绍了一种以单片机为微处理器的数据采集系统,系统中新型串行口A/D转换器及复位电路的使用,使它的体积减小,抗干扰性能提高.此外,键盘、显示器及通信接口的配置,使它既可作为一个独立的数据采集系统,又可作为面向对象的数据采集器,与PC机配合使用.     

新阶段全球半导体供应链重构及其思考

半导体攸关国家安危，百年未有之大变局中的诸多因素诱发第四次全球半导体供应链重构。梳理了前三次全球半导体供应链重构的过程，并基于系统动力学、演化经济学等理论构建了产品—企业—区域—全球(PERG)分析框架，探讨了第四次全球半导体供应链重构的原因及趋势。虽然中国大陆半导体产品和企业实力与美欧日韩及中国台湾地区具有很大差距，但全球影响力已上升为全球第二梯队。第四次全球半导体供应链重构由美国主导，但中国大陆将成为第四次全球半导体供应链重构的核心力量。中国大陆应做好半导体产业发展的长期规划，发挥新型举国体制和现代市场机制的作用，从PERG四个方面全面发力提升自身实力，稳定半导体领域外资和台资，持续推动本土替代，深度嵌入美欧日韩及中国台湾地区的全球半导体供应链。     

A GLOBAL VIEW OF CROSS‐BORDER MIGRATION

This paper evaluates the global welfare impact of observed levels of migration using a quantitative multi‐sector model of the world economy calibrated to aggregate and firm‐level data. Our framework features cross‐country labor productivity differences, international trade, remittances, and a heterogeneous workforce. We compare welfare under the observed levels of migration to a no‐migration counterfactual. In the long run, natives in countries that received a lot of migration—such as Canada or Australia—are better off due to greater product variety available in consumption and as intermediate inputs. In the short run, the impact of migration on average welfare in these countries is close to zero, while the skilled and unskilled natives tend to experience welfare changes of opposite signs. The remaining natives in countries with large emigration flows—such as Jamaica or El Salvador—are also better off due to migration, but for a different reason: remittances. The welfare impact of observed levels of migration is substantial, at about 5% to 10% for the main receiving countries and about 10% in countries with large incoming remittances.