排序方式： 共有45条查询结果，搜索用时 15 毫秒
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建立双寡头Bertrand序贯博弈模型,比较均衡时四种环境规制手段的厂商RD激励大小。认为排污税和拍卖RD激励最高,在异质产品市场上,使用简单排放标准比排污权交易更能激励企业从事环境研发投资,获得动态效率提升。在环境治理方式选择上,切忌政策"一刀切",要充分考虑市场结构、规制目标和需求函数等诸多因素影响。 相似文献
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科技服务业对科技创新有关键的支撑推动作用,是现代服务业的重要组成部分,是推动产业结构升级优化的关键产业。面对未来创新经济发展的要求,我国科技服务业在体制机制方面存在诸多不适应性。在分析我国科技服务业发展水平的基础上,利用1995—2012 年中国各省级行政区域科技服务业有关数据,通过空间基尼系数等,解析了中国科技服务业空间集聚发展态势,运用层次聚类分析法考察了我国科技服务业存在的区域非均衡性,阐述了中国科技服务业非均衡发展的深层原因,在借鉴国外发达国家经验基础上,认为对作为现代服务业发展新业态的科技服务业,分别从横向支撑体系、纵向支撑体系、结构支撑体系以及不同区域发展路径提出推进中国科技服务业发展的对策。 相似文献
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基于行业异质性视角,以2010年—2015年我国省级制造业规模以上企业为样本,将环境规制划分为正式型与非正式型两类,对比分析了沿海与内陆地区环境规制、行业异质性对企业技术创新影响的差异。研究发现：(1)从制造业全行业来看,正式型环境规制对技术创新的影响作用在沿海与内陆地区均显著为正;非正式型环境规制对技术创新的影响作用在沿海地区显著为正,在内陆地区作用不显著;环境规制强度对技术创新的影响作用在沿海地区显著为负,在内陆地区显著为正。(2)环境规制对高污染行业的技术创新作用在沿海地区显著为正,在内陆地区显著为负。(3)环境规制对高搬迁成本行业的技术创新作用在沿海地区显著为正,在内陆地区显著为负。 相似文献
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A recent meta-analytical paper (Bierwiaczonek & Kunst, 2021) sparked a controversy by demonstrating that cross-sectional associations between acculturation preferences and adaptation are weak and heterogenous, and approach zero when assessed over time. Some responses criticized the paper by arguing that small but robust effects can make a real-life difference if applied to millions of migrants. In this paper, we present additional analyses to illustrate how the heterogeneity of correlational integration effects complicates and potentially undermines this notion. We estimate that true effects of integration and heritage culture orientation are negative almost 30 % of the time, and only true effects of mainstream culture orientation seem to be relatively homogenous. We conclude that the combination of a weak effect with high heterogeneity makes integration effects largely unpredictable, meaning that for some migrant groups, adopting the integration strategy will be associated with positive outcomes, and for others with negative outcomes, with no evidence that any of those outcomes are caused by integration. 相似文献
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The measurement of teaching efficiency of Italian universities has become a topic of much interest and debate in recent years. The aim of this study is to fully explore the potential of panel data in the analysis of teaching efficiency both by modelling human capital formation in the university as a series of sub-processes and by using various models to account for observed and unobserved factors which generate heterogeneity. The new approach for estimating a stochastic frontier model based on the Generalized Maximum Entropy method provides further insights into the measurement of university teaching performance. The evolution of efficiency throughout the entire study period was also analyzed. 相似文献
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This study investigated heterogeneity in the developmental trajectories of internalizing symptoms among 541 children who were involved with the child welfare system and examined child maltreatment characteristics, including types, level of harm, and timing, as predictors of internalizing trajectory patterns. Secondary longitudinal research was conducted using data from the National Survey of Child and Adolescent Well-Being-I, collected from 1999 to 2007 in the United States. Three distinct trajectory groups were identified: high–decreasing; low–increasing; and low–stable Sexual abuse, emotional abuse, neglect, and more severe levels of harm from maltreatment predicted membership in two maladaptive groups compared to the low–stable group. The findings of the study suggest the importance of providing a thorough assessment of the type and severity of maltreatment experiences and continued monitoring of internalizing symptoms for children with child welfare involvement. 相似文献
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以2016—2019年公司风险投资(CVC)支持的创业板上市制造业企业为样本,研究CVC联合投资对被投资企业技术创新的影响.研究发现,相比CVC单独投资的企业,CVC联合投资的企业技术创新能力较弱;联合投资成员持股比例的差异显著抑制被投资企业技术创新的提升;联合投资成员产权性质的多元化显著促进被投资企业技术创新的提升;联合投资成员母公司的行业异质性促进被投资企业的技术创新;而联合投资成员母公司与被投资企业的行业相似度不利于被投资企业技术创新. 相似文献
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Adela García-Aracil 《Research in higher education》2008,49(8):733-757
This paper explores the effects of degree choice on the distribution of occupational benefits in terms of income, and their
contribution to the gender earnings gap, among young European higher education graduates. The results reveal that the field
of study, which is the result of a personal choice, appears to influence the distribution of work-related benefits among graduates
even after controlling for unobservable heterogeneity and observable individual/job specific characteristics. Analysis of
the gender earnings gap shows that the earning disparities among female/male graduates in Education, Humanities and Mathematics
are smaller. 相似文献
10.
汪旺根 《喀什师范学院学报》2011,32(6):97-100
教师队伍建设的本质是具体的,高校教师队伍建设因地域性、高校类型、办学层次、定位的不同而表现出一定的异质性.高校教师队伍建设的方法和策略如果缺乏针对性,就会在实践中出现无所适从的局面.因此,无论是考察教师队伍建设现状,还是探讨其原因、对策等,都必须根植于高校教师队伍的异质性研究.探讨民族异质性、地区异质性和高校自身管理的异质性对高校教师队伍建设的影响,这对南疆地区而言,尤其具有说服力. 相似文献