我国高速铁路对城市贸易发展的影响分析 ——基于对外开放程度不同城市的实证

高速铁路凭借其特有的技术经济特性成为影响城市贸易发展的重要驱动力,但其对城市进出口贸易有何影响及如何影响需进一步探索。通过对三个开放等级度56个城市的2006-2018年面板数据,运用双重差分模型(DID)进行实证研究,分析出高铁对城市贸易发展的影响情况。结论表明：高铁对开放程度较低城市的贸易发展有显著的促进作用;高铁对总体城市的贸易发展的影响并不显著;高铁主要是通过促进城市进口贸易的发展来提升城市贸易的整体水平。     

公路改扩建道路路基加宽施工技术探究

本文结合实际案例,对公路路基扩建加宽的重要性进行分析,然后针对当前改扩建道路路基加宽施工中容易遇到的问题以及一些施工难点进行分析,并对我国公路的路基改扩建加宽施工技术、台阶施工以及路基填料等方面的具体应用进行了分析,期望对提高我国道路建设效果具有一定的借鉴和参考意义.     

区域配网可靠性提升方案研究

北京市城市副中心地区整体规划定级已实现跃升,为满足更高的可靠性级别,需要对现状配电网开展大量新建、改建工程.针对环网柜、中置柜的设备特点,本文列举出了部分接线形式,分析说明其特点运行注意事项,以供地区配网改造参考.     

限高地下室项目设计风险评价研究

鉴于限高地下室的复杂结构给建筑设计带来的巨大风险,利用层次分析法对该类建筑设计的方案设计阶段、扩初设计阶段以及施工配合设计阶段进行风险评估,并在此基础上结合智慧建造技术给出相应对策,为限高地下室设计提供风险管理依据.     

中国城市科技人才集聚促进了全要素生产率增长吗——来自285个地级市的经验研究

基于2005—2018年中国内地285个地级市数据,对城市科技人才集聚与全要素生产率（简称“TFP”）进行测度分析,实证考察科技人才集聚对TFP的影响。结果表明：①城市科技人才集聚与TFP空间分异特征显著,但二者具有较强的时空一致性,即科技人才集聚特征显著的城市,其TFP也相对稳定;②城市科技人才集聚对TFP的影响呈倒U型,但研究期内大多数城市仍处于集聚效应占主导阶段,科技人才集聚通过提升城市技术进步水平促进TFP增长,而科技人才集聚对技术效率的影响呈倒U型;③不同类型城市科技人才集聚对其TFP影响的异质性显著,且适宜集聚区间也存在差异。省会城市及一、二线城市等优势特征显著的城市所能承受的科技人才集聚规模上限更高,有利于通过释放集聚红利促进TFP增长,而非省会城市、三线及以下城市等则拐点值较低。     

创新要素投入产出效率随机变动测度与结果分析

创新要素配置在投入产出两个环节中生成大量不完全技术信息,投入产出效率随机变动更加明显。从投入产出数据集合中提炼共同因子,与不可观测变量构成预测器,建立因子增广向量自回归模型(FAVAR),分析随机变动方差构成,测度投入产出效率随机变动程度。随机变动效应包括水平效应、稳定性效应和规模效应。投入产出效率自回归扰动项表示随机变动程度,将其细分为共同因子,计算预测器方差及其与投入产出效率的协方差。基于669家上市公司月度、季度、半年度和年度技术研发数据,比较分析投入产出效率随机变动程度及形成原因,引入脉冲响应法分析变量方差构成与变动特征,提出相关政策建议。     

The impact of XBRL on real earnings management: unexpected consequences of the XBRL implementation in China

Review of Quantitative Finance and Accounting - In this paper, we investigate whether there is a change of real earnings management for firms facing pressures of the new technology implementation...     

The Benefit of Frequent Corporate Philanthropy

Applying behavioural economic theory, we argue that the frequency of philanthropic activity is important in determining corporate philanthropy's economic outcome. Using Chinese data from 2003 to 2016, we find that firms with more frequent philanthropic activities obtain more government subsidies than firms that only engage in one-off charitable donations. Firms with better corporate governance, such as higher management ownership and more independent directors, are more likely to adopt a strategy of frequent donation. Furthermore, firms are more likely to be frequent donors when management or local government officers have a long tenure. Our findings provide insight into the giving process and suggest that firms can maximize the benefit of corporate philanthropy if they strategically consider the donation frequency and donation amount simultaneously.     

Effect of goods market segmentation on labor mobility: Evidence from China

This study empirically investigates the effects of goods market segmentation on interregional labor mobility using data from National Population Surveys in China. The findings reveal that a one-standard deviation increase in the goods market segmentation index reduces interprovincial migration by 4.0%. Restraining interregional trade and improving industrial specialization are the two mechanisms at work. Further analysis indicates that the restrictive effect of goods market segmentation is greater on highly educated laborers and the labor flows from poorer to richer regions. The heterogeneous analysis also implies that migrants are more concerned about educational resources and consumption diversity.     

Do outsourcing services provided by agricultural cooperatives affect technical efficiency? Insights from tobacco farmers in China

In this study, we assess whether household outsourcing production tasks provided by tobacco cooperatives affect household technical efficiency, using the survey data from 449 households in Guizhou Province, China in 2014. The one-step estimation of the stochastic frontier production function is employed. We also use the instrumental variable approach to address the potential selection biases that may arise from unobserved factors that are correlated with both outsourcing service adoption and technical efficiency. The empirical results show that the farmers’ decision to outsource agricultural services provided by cooperatives has a positive effect on technical efficiency. The effects of outsourcing on technical efficiency are highly heterogeneous at different production stages. It is also interesting to note that the magnitudes of outsourcing effects on technical efficiency are similar between labor-intensive services and technology-intensive services.