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1.
针对推动经济高质量增长与实现生态可持续发展重要战略结合点的绿色创新效率问题,运用SBM模型,构建以高技术产业集聚为门槛变量的面板门槛模型,测算2008-2018年我国28个省份高技术产业绿色创新效率,实证分析创新质量对高技术产业绿色创新效率的影响机理.结果 表明:在研究期内,28个省份高技术产业绿色创新效率稳步提升但尚有较大提升空间,并存在明显的空间差异特征,其中绿色创新效率东部地区＞中部地区＞西部地区;创新质量对东、中部高技术产业绿色创新效率存在基于产业集聚水平的双重门槛效应,门槛值分别为0.636、0.944,而西部当高技术产业集聚水平跨越0.363门槛值时,创新质量对绿色创新效率才会有显著促进作用;企业规模、劳动者素质、政府行为对高技术产业绿色创新效率具有显著正向影响,对外开放显著抑制绿色创新效率提升.最后基于研究结论,提出综合考虑区域发展差异、充分发挥协同优化作用、积极实施人才引进战略等促进我国高技术产业绿色创新效率提升的对策建议. 相似文献
2.
本文利用中国30个省份2005—2019年的区域创新面板数据,运用DEA模型和区域熵方法分别测度区域创新效率和高技术产业集聚值,从空间计量经济学视角对高技术产业集聚与区域创新效率之间的关系和空间溢出效应进行实证分析。研究表明：从全国层面看,高技术产业集聚通过规模经济效应、产业关联效应和空间溢出效应对区域创新效率产生显著的影响作用,高技术产业集聚和区域创新效率存在非线性倒U形关系。从区域层面看,高技术产业集聚对于区域创新效率的正向促进作用在东部地区显著强于中西部地区。 相似文献
3.
利用我国30个省份2008~2017年的数据,构建Super-SBM模型测度各区域绿色技术创新效率,进而利用门槛面板模型,以环境规制和产业集聚为门槛变量,实证研究贸易对区域绿色技术创新效率溢出的非线性影响。结果表明：(1)从效率值来看,我国绿色技术创新效率增长迅速,但区域发展“不平衡性”严重,东部地区的效率值遥遥领先于中西部地区；(2)从门槛结果来看,贸易对区域绿色技术创新效率的溢出显著存在环境规制、产业集聚的“双门槛”效应；(3)从作用机制来看,环境规制下的贸易与绿色技术创新效率呈“U”型关系,随着环境规制强度提高,溢出的“挤出效应”逐步转为“激励效应”,影响由负变正且作用逐渐增大；产业集聚下的贸易与绿色技术创新效率呈“N”型关系,仅当产业集聚水平跨过第二门槛时,影响显著为正；环境规制对绿色技术创新效率表现为显著的直接推动作用和间接门槛作用,产业集聚对绿色技术创新效率仅表现为间接门槛作用。 相似文献
4.
区域居民购房能力与科技人才集聚关系研究 《科学学研究》2022,40(6):1001-1013
摘要：随着创新作用的日趋凸显，构建一个富有活力的创新生态系统逐渐上升至战略议题，作为信息与知识的重要载体，科技人才对于创新生态的发展起着至关重要的作用。基于中国省际面板数据，在创新生态情境下，探讨区域居民购房能力对科技人才集聚产生的影响。结果表明：（1）区域居民购房能力与科技人才集聚存在倒U型关系，仅新疆、内蒙古、贵州、山西、湖南等地长期位于拐点右侧。（2）相比房价，区域工资水平的是购房能力的正向驱动科技人才集聚的关键因素。（3）创新生态系统各子系统的耦合协调发展水平是划分购房能力提升所产生“吸纳”效果的门槛变量。当跨过创新生态耦合门槛值之后，提高居民收入水平有助于促进地区科技人才集聚程度的提升（4）随着区域创新生态水平的提高，购房能力对于高技术产业与工业企业科技人才集聚影响存在不同，前者呈现持续递增态势，而后者，在跨过第二个门槛值之后，促进作用存在一定回落。 相似文献
5.
基于静态效率和动态生产率的双重视角,本文运用系统广义矩估计方法(SGMM)和中介效应模型等研究方法,从理论和实证两个层面分析了高技术产业集聚对绿色技术创新绩效的影响及其内在机理。研究发现:从全国总体来看,高技术产业集聚对绿色技术创新绩效具有显著的促进作用,且绿色技术进步是高技术产业集聚促进绿色技术创新绩效提升的主要驱动力;进一步的机理检验表明,高技术产业聚集会通过推进绿色技术创新和提高绿色生产效率,产生技术溢出效应和规模经济效应,进而实现绿色技术创新绩效提升;无论是基于静态效率视角还是基于动态生产率视角,高技术产业集聚对绿色技术创新绩效的提升作用均存在明显的区域差异;此外,上述研究结论具有较强的稳健性。本文为我国推进绿色发展与创新驱动有机结合,进而推动创新型国家和美丽中国建设提供了有益的政策启示。 相似文献
6.
本文基于2006-2012年省级面板数据,采用Super-SBM模型测度环境约束下中国高技术产业绿色创新效率;在此基础上构建门槛模型实证分析RD投入强度对其产生的影响。结果表明:Super-SBM模型度量的高技术产业绿色创新效率符合实际,八大经济区域高技术产业绿色创新效率存在地域差异;以企业规模为门槛变量,RD投入强度对高技术产业绿色创新效率具有双重门槛效应,市场环境、政府资助、产业集聚均与高技术产业绿色创新效率显著正相关,而劳动者素质影响不明显。 相似文献
7.
本文基于1997—2013年中国高技术产业数据,构建不同行业和不同地区高技术产业动态面板数据模型,采用系统GMM估计实证分析三大产业集聚的外部性（MAR外部性、Jacobs外部性、Porter外部性）对高技术产业创新的影响,实证结果显示： 产业多样化对中国高技术产业创新具有显著的促进作用,而产业专业化和企业竞争对高技术产业创新影响并不显著;东中西部地区和五大高技术行业的产业集聚外部性对产业创新影响效果不同,循环累积效应在不同模型中对区域产业创新均具有显著的正向影响;地区规模、人力资本水平和外商直接投资三大控制变量及其平方项在不同模型中的作用效果和显著性水平具有明显差异. 相似文献
8.
摘要：绿色创新已成为推动经济高质量增长与实现生态可持续发展的重要战略结合点。运用SBM模型测算2008-2018年全国内地28省市高技术产业绿色创新效率,构建以高技术产业集聚为门槛变量的面板门槛模型,实证分析创新质量对高技术产业绿色创新效率的影响机理。结果表明：国内高技术产业绿色创新效率在研究期内稳步提升,但尚有较大提升空间;高技术产业绿色创新效率存在明显的空间差异特征,绿色创新效率东部地区>中部地区>西部地区;创新质量对高技术产业绿色创新效率的影响存在基于高技术产业集聚水平的双重门槛效应,企业规模、劳动者素质、政府行为对绿色创新效率具有显著正向影响,对外开放显著抑制绿色创新效率提升。 相似文献
9.
生产性服务业集聚对绿色经济效率的影响研究 《科学学研究》2022,40(11):1968-1978
作为制造业转型升级的重要动力,生产性服务业已经成为推动我国经济高质量发展的重要引擎。本文选取2005-2018年中国278个城市面板数据,实证检验了生产性服务业集聚对城市绿色经济效率提升的机理。研究结果表明：（1）生产性服务业集聚对城市绿色经济效率有显著促进作用,且存在空间溢出效应,但直接效应更大;（2）生产性服务业集聚可以通过工业生产率、知识存量和市场环境三条路径影响城市绿色经济效率,但存在异质性;（3）知识存量和市场环境两种中介效应均存在双重门槛,且两者在调节生产性服务业集聚作用绿色经济效率中表现出“由抑制到促进,由微弱到增强”的阶梯性特征。文章不仅检验了生产性服务业集聚在影响城市绿色经济效率中具体的影响路径;同时,也证实了门槛效应和空间效应的存在。 相似文献
10.
为促进立体多式交通在中国的生态集约效应及红利共享效应增长,推进新时代区域经济高质量协调发展,将高技术产业集聚的空间溢出效应与多式交通相结合,基于新经济地理学,采用熵值法、空间杜宾模型,利用中国30个省份2005—2018年相关数据,综合分析公路、铁路、航空3类主要交通方式对区域高技术产业集聚的空间溢出效应及逻辑路径。结果表明：高技术产业集聚水平存在显著的空间依赖性,相邻省域高技术产业集聚存在正向溢出;3种交通方式对高技术产业空间集聚均有显著正向溢出效应但存在差异,对于高技术产业集聚度高的省份,与其位置相邻、经济条件相似的省份获得其溢出效应主要通过公路运输,航空或铁路运输次之,而与其位置相邻、技术条件相似的省份则主要通过铁路运输,次之为航空运输,最后才是公路运输。据此提出建构并完善多式联运交通网络、有先后空间时序地建设不同交通、提升高技术产业发展的区域整体效应等对策建议。 相似文献
11.
A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
12.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
13.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
14.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
15.
Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
16.
《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
17.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
18.
《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
19.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
20.
Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献