水工建筑混凝土结构施工技术的研究

我国幅员辽阔,地形复杂,河流众多,水利工程的建设一直是我国在基础设施建设方面十分看重的内容.为确保水利工程建成后能对防洪抗旱与农业灌溉等方面提供更好地服务,水利工程的建设必须安全可靠.本文就如何在水利工程施工中使混凝土结构建筑能够达到质量标准要求进行分析,重点探讨水利工程建筑中混凝土结构的施工技术与应用,以供工程项目作参考.     

水工建筑混凝土结构施工技术的研究

我国幅员辽阔,地形复杂,河流众多,水利工程的建设一直是我国在基础设施建设方面十分看重的内容.为确保水利工程建成后能对防洪抗旱与农业灌溉等方面提供更好地服务,水利工程的建设必须安全可靠.本文就如何在水利工程施工中使混凝土结构建筑能够达到质量标准要求进行分析,重点探讨水利工程建筑中混凝土结构的施工技术与应用,以供工程项目作参考.     

新冠疫情全球蔓延对我国就业的影响及机制分析

新冠疫情全球蔓延对需求端与供给端都造成巨大的冲击,评估此次疫情对我国就业的影响及机制分析变得重要.基于统计比较和使用DID模型,我们研究表明:(1)新冠疫情爆发前,我国总体失业率基本稳定,地区间失业差异趋于缩小;2020年疫情爆发后,我国城镇调查失业率出现明显上升,但其影响在下半年趋于缓解.(2)新冠疫情全球蔓延对我国就业市场产生显著不利的冲击,但对我国31个大城市就业的不利冲击要相对小于总体城镇.新冠疫情导致我国城镇调查失业率总体上升0.31个百分点,导致全国31个大城市调查失业率总体上升0.218个百分点.新冠疫情爆发4个月后我国就业受到的不利影响开始减小.(3)新冠疫情对我国制造业和服务业的经济活动均造成不利冲击,进而对我国就业造成显著不利的影响,且对我国服务业经济活动产生的不利冲击更大.据此,需要严格防控国内疫情反弹,提升一流的营商环境,对受疫情不利影响的企业和劳动者提供优惠政策支持,出台人力资本政策支持建立国家高端人力资本储备池,拓展数字贸易、数字平台等就业创业.     

重大公共危机中科研协同团队识别研究——以诊断试剂为例

遴选合适的科研机构以整合成科研协同力量对于应对重大公共危机，尤其是对于防治和遏制新型冠状病毒肺炎等重大紧急疫情至关重要。首先，构建科研力量协同整合潜在对象识别理论模型，并在此基础上构建识别方法。以突发重大公共危机中的诊断试剂科研攻关为研究对象，以诊断试剂领域科研力量协同整合作为案例进行实证研究。最终识别出7个协同合作群组及29个关键核心机构，而且可将其整合为针对不同科研攻关需求的科研力量。结果还表明，在整合诊断试剂领域科研力量时，高校是与其它机构衔接的主要核心纽带，来自国家层面的科研院所及军队系统机构可以提供有力支持，而高新技术企业也是不可忽视的重要力量。     

农地流转市场中的土地流向及效果分析

［目的］我国农地流转市场发展迅速，农村土地呈现集中趋势。准确把握农村土地流动方向，探析农地流转对农业生产效率及农民收入的影响，对保障农地流转市场健康发展，实现农业现代化的关键，具有重要的现实意义。［方法］基于文献研究法对相关研究进行梳理和总结。［结果］（1）有效的农地流转市场使土地从低效率生产者流转至高效率生产者，从高收入农户流转至收入两端的农户，并有提高农业生产效率和增加农民收入的作用。转入户中存在显著的异质性差异，一部分是缺乏资金和人力资本的小规模农户，另一部分则是具有丰富资金和人力资本的大规模农户。（2）农业比较收益劣势易造成农地流转市场扭曲，改变土地流动方向，导致农业生产效率下降，并加剧农民收入的不平等。［结论］有效的农地流转市场有助于提高农业生产效率并增加农户收入。然而，农业较低的比较收益及政府的过度干预易造成农地流转市场扭曲，农业生产效率提升潜力难以发挥，增收效应减弱，农村收入差距加大。建议政府对农地流转进行有序引导，并注重劳动力市场及信贷市场的配套完善。     

Trade openness,FDI, and income inequality: Evidence from sub‐Saharan Africa

The motivation for this study stems from the United Nations Sustainable Development Goals (UN‐SDGs) and their impact by 2030. The UN highlights 17 SDGs that address pertinent local and global issues, one of which—SDG‐10—has been devoted to reducing inequality. This study investigates the nexus between trade openness, foreign direct investment (FDI), and income inequality in sub‐Saharan Africa using panel data from 2000 to 2015 and the generalized method of moment (GMM) technique approach. The findings show that FDI and income have a negative, statistically significant relationship with income inequality, signifying that as FDI and income per capita increase, the level of income inequality decreases. However, trade openness, education, political stability, corruption, and rule of law have a positive, statistically significant relationship with inequality. This study, therefore, offers some recommendations that will help policymakers. First, develop good policies to attract more foreign investors, which will contribute to creating employment opportunities in the region. Second, create more infrastructures to provide good quality education. Third, implement a good policy to motivate local production which will contribute to creating jobs. Fourth, build a strong institution(s) to fight against corruption.     

The influence of management team continuation on inefficient investment after family firms inheritance

The purpose of this study is to explore how the executive team continuation affects the successor's investment decisions. To this end, we use data of Chinese A‐share listed heritage family enterprises. The findings reveal that executive team continuation has a negative impact on inefficient investment. At the same time, the successor's control rights have a moderating effect on the relationship between the executive team continuation and the successor's investment decisions. In addition, further research shows that the heterogeneity of senior executives' tenure, the number of independent directors, and the distribution of senior executives' professional backgrounds are conducive to explaining the internal mechanism of the continuation of the management team.     

乡村振兴背景下安徽省农村经济与人居环境协调度研究

在乡村振兴战略背景下,应关注农村内部各系统之间的相互协调,以期实现乡村整体水平的优化发展.以安徽省为研究对象,建立农村经济与人居环境发展水平的指标评价体系,运用熵值赋权法、耦合协调模型,计算各市农村经济与人居环境发展水平的综合指数以及二者的协调度.实证结果表明:安徽省农村经济与人居环境水平具有明显的区域差异性,总体协调度相对偏低.因此,应进行不同产业的深度融合,树立绿色引领乡村振兴的理念,健全农村公共设施的投资机制等.     

Impact of Decision Rules and Non-cooperative Behaviors on Minimum Consensus Cost in Group Decision Making

Group Decision and Negotiation - In group decision making, it is sensible to achive minimum consensus cost (MCC) because the consensus reaching process resources are often limited. In this...     

Procyclicality of the comovement between dividend growth and consumption growth

Duffee (2005) shows that the amount of consumption risk (i.e., the conditional covariance between market returns and consumption growth) is procyclical. In light of this “Duffee Puzzle,” I empirically demonstrate that the conditional covariance between dividend growth (i.e., the immediate cash flow part of market returns) and consumption growth is (1) procyclical and (2) a consistent source of procyclicality in the puzzle. Moreover, I solve an external habit formation model that incorporates realistic joint dynamics of dividend growth and consumption growth. The procyclical dividend-consumption comovement entails two new procyclical terms in the amount of consumption risk via cash flow and valuation channels, respectively. These two procyclical terms play an important role in generating a realistic magnitude of consumption risk. In contrast to extant habit formation models, the conditional equity premium no longer increases monotonically when a negative consumption shock arrives because it might lower the amount of risk while increasing the price of risk.