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基于2001-2014年中国企业对“一带一路”沿线国家海外并购数据，利用PSM方法研究了跨国并购对母公司研发创新的影响。结果表明：总体上来看，中国企业对“一带一路”国家的跨国并购显著提升了其研发水平；相比较于劳动密集型产业，资本密集型产业对资本要素和研发创新技术具有较强的敏感性，跨国并购对其研发创新的影响更明显；相比较于东部地区，由于中西部地区企业创新能力较低且多以要素密集型为主，跨国并购对中西部地区跨国企业研发创新的影响较弱。此外，在考虑目标企业所在国家（地区）的地理分布和创新能力因素时发现，跨国并购对母公司研发创新的提升效用随着目标企业所在国家创新能力的减弱而下降。最后，本文实证研究的基础上提出了相应的对策建议。 相似文献
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在中国产业结构优化升级的过程中,外商直接投资对产业研发创新的重要性日益凸显,与此同时,为应对日益严峻的环境污染问题所制定的环境保护政策是否会对外资企业研发创新造成影响。文本利用2004~2007年企业层面微观数据,采用倾向得分匹配方法全面系统地评估了环境约束对外资企业研发创新的影响。结果表明：环境规制与外资企业研发创新存在显著的相关关系,其对外资企业研发创新的影响不仅具有即时性,同时具有持续性;此外,研究还发现环境规制对不同行业类型外资企业研发创新的影响也存在差异。 相似文献
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《Information processing & management》2001,37(4):623-637
One of the most important problems in information retrieval is determining the order of documents in the answer returned to the user. Many methods and algorithms for document ordering have been proposed. The method introduced in this paper differs from them especially in that it uses a probabilistic model of a document set. In this model documents are regarded as states of a Markov chain, where transition probabilities are directly proportional to similarities between documents. Steady-state probabilities reflect similarities of particular documents to the whole answer set. If documents are ordered according to these probabilities, at the top of a list there will be documents that are the best representatives of the set, and at the bottom those which are the worst representatives. The method was tested against databases INSPEC and Networked Computer Science Technical Reference Library (NCSTRL). Test results are positive. Values of the Kendall rank correlation coefficient indicate high similarity between rankings generated by the proposed method and rankings produced by experts. Results are comparable with rankings generated by the vector model using standard weighting schema tf·idf. 相似文献
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独立学院转设是当前我国高等教育改革的重大任务。公办型独立学院是我国独立学院的重要类型,转设中面临的挑战更多,是“难点中的难点”。推进公办型独立学院转设须创新办学体制和办学模式,允许和鼓励各地采取灵活的政策措施和管理制度。公办型独立学院可探索转设为公有力量举办的非营利性民办高校、“无举办者”的民办高校或混合所有制高校,亦可探索“第三条道路”的办学路径。为加快公办型独立学院转设步伐,可采取如下对策：完善顶层设计,增进转设共识;寻求省市县政府支持,增强制度变迁动力;预防和化解风险,维护师生利益。 相似文献
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近年来我国对于体育产业的发展愈发重视,在经济发展的大背景下,我国将体育产业的发展作为中国经济稳步向前的重要路径之一。作为体育产业发展宏观层面的干预方式,近年来一系列扶持、促进与激励性体育产业政策相继出台,促进我国体育产业进入快速发展阶段。在现有的政策环境下,把握体育产业政策的演变趋势和特征,可为体育产业发展创造更加完善的政策环境。以2012—2019年我国体育产业政策文件作为研究对象,运用内容分析法、文献分析法、数理统计法、社会网络分析法等,采用ROSTCM6文本挖掘软件对政策文本进行量化分析,通过提取共现主题词,进行矩阵分析和描述性分析,并对政策文本内容进行详细分析,总结近年来我国体育产业政策的演变趋势与特征。 相似文献
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China's unprecedented economic boom has led a massive number of children left-behind by their peasant parents who have immigrated to urban areas in search of work. In current study, we explored how being left behind is associated with children's positive emotions and negative psychological traits by examining the differences in levels of happiness, self-esteem and anxiety between left-behind children (LBC) and non-LBC. A total of 448 students (aged 7–16) from three schools in Sichuan Province in China responded to the questionnaire. Fourteen teachers of LBC were invited to one-to-one interviews for in depth responses to LBC's behaviors and psychological well-being. The results revealed that non-LBC showed a higher level of happiness (t = −0.21, df = 258, p < 0.01) and a lower level of anxiety (t = 1.41, df = 406, p < 0.05) than LBC children. Among LBC, low grade children (primary school grades 3 and 4) reported a lower level of happiness (t = −0.73, df = 216, p <0.01) and self-esteem (t = −0.24, df = 191, p < 0.01) than their older counterparts (primary school grades 5 and 6). The teachers' accounts confirmed the statistical results that LBC suffered from the deprivation of parental care. According to the teachers, as LBC grew older, they developed an understanding of their own circumstances and came to appreciate their parents' decisions. With appropriate and adequate support provided to both LBC and the caretakers around them such as relatives and teachers, it may be possible to reduce the adverse impacts of parental deprivation on LBC. 相似文献
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通过文献资料法和数理统计法,以1988—2016年中国乒乓球奥运会夺金运动员的年龄结构为出发点,对我国38名奥运会夺金运动员的年龄结构、训练年限及参赛年龄进行深度分析,旨在探索影响我国奥运会夺金乒乓球运动员年龄结构的因素,为我国乒乓球运动的发展提供参考。研究表明:乒乓球奥运会夺金运动员的年龄结构呈递增关系,男子运动员增长的幅度大于女子运动员;激烈的内部竞争机制促使奥运参赛年龄结构的成熟化;竞赛规则的改变对夺金运动员的年龄结构增长具有显著影响;科学化训练和体育价值的体现与奥运参赛夺金运动员年龄结构呈正相关。 相似文献
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This paper is based on a study of fourteen Norwegian K-12 teachers who have been violated by students in schools. One key theme emerged during the process of analysis: the threat to the teachers’ self. This threat appears to be intensified due to lack of support. The findings in this small-scale Norwegian study indicate that student-to-teacher violation can have a serious impact on teachers’ perceptions of their individual and professional self. The findings disclose that the teachers’ self is affected leading to changed, weakened and disrupted experience of teachers’ self-understanding. This knowledge may influence how teachers can continue working when critical incidents occur. 相似文献
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Ultrathin two-dimensional (2D) materials have attracted considerable attention for their unique physicochemical properties and promising applications; however, preparation of freestanding ultrathin 2D noble metal remains a significant challenge. Here, for the first time, we report use of a wet-chemical method to synthesize partially hydroxylated ultrathin Ir nanosheets (Ir-NSs) of only five to six atomic layers’ thickness. Detailed analysis indicates that the growth confinement effect of carbon monoxide and the partially hydroxylated surface play a critical role in formation of the ultrathin structure. The ultrathin Ir-NSs exhibit excellent performance for both the hydrogen evolution reaction and oxygen evolution reaction in a wide pH range, outperforming the state-of-the-art Pt/C and IrO2, respectively. Density-functional theory calculations reveal that the partial hydroxylation not only enhances the surface electron transfer between Ir-sites and intermediate O-species, but also guarantees efficient initial activation of bond cleavage of H-O-H for first-step H2O splitting. This, ultimately, breaks through barriers to full water splitting, with efficient electron transfer essentially maintained. 相似文献