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采用超效率EBM模型对2013—2019年长江经济带36个城市的绿色创新效率进行测度,通过构建修正引力模型得到城市间绿色创新效率的空间关联矩阵,运用社会网络分析法和QAP分析法从网络化视角探索长江经济带城市绿色创新效率的空间网络关联特征和形成机理.研究表明:(1)研究期间长江经济带城市绿色创新效率空间关联强度处于下降趋势,等级结构特征比较明显,下游城市在空间网络中处于相对中心的位置,而中上游城市处于相对劣势地位;(2)长江经济带城市绿色创新效率集聚板块特征呈现板块内集聚、板块之间存在一定空间关联;(3)城市环保、科研投入差异有利于长江经济带城市绿色创新效率空间网络的形成,城市距离、开放、创新水平差异则对其有负向影响.为促进长江经济带城市可持续发展,提出将长江经济带城市看作一个整体,在提升绿色创新效率时注重城市间的协同关系和联动效应;打破长江经济带绿色创新效率的马太效应,优化整体格局;进一步完善各城市的交通设施,推进路网规划设施建设等建议. 相似文献
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文章采用超效率SBM-DEA模型和探索性空间数据分析方法（ESDA）对2004—2018年长江经济带108个城市绿色创新效率的时空演变特征和空间相关性进行了研究。结果表明：长江经济带绿色创新效率前期呈“倒V型”发展趋势，金融危机后呈缓慢的波动上升状态，纯技术效率是影响绿色创新效率的关键因素；长江经济带上、中、下游的绿色创新效率存在差异，其中下游区域的效率水平最高，上游和中游城市的绿色创新效率均值在各年份期间交替领先；长江经济带绿色创新效率的空间格局由上游和下游高于中游的“U型分布”特征逐渐转变为“多中心分布”特征；随着时间的推进，城市间绿色创新效率的正向空间相关性愈发显著，但低效率城市聚集的规模大于高效率城市，局部两级分化现象加剧。 相似文献
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采用超效率EBM模型测算纳入能源要素的区域绿色创新效率,并从空间相关角度,采用探索性空间数据分析（ESDA）方法分析区域绿色创新效率的时空差异。以长江经济带制造业为例,运用2008—2019年有关面板数据构建绿色创新效率测算指标体系,实证结果发现：（1）各年份内长江经济带制造业绿色创新效率值均小于1,未实现有效生产,其中下游地区的创新效率最高,中上游地区的创新效率较低;（2）各省市制造业绿色创新效率空间差异明显,且与其经济发展水平的空间分布格局表现出协调一致性;（3）各省市制造业绿色创新效率在空间上表现出正的自相关性,存在空间集聚特征。根据研究结论,分别从提升绿色创新水平、强化空间集聚效应和推动区域趋同化发展3个角度提出促进长江经济带制造业绿色创新的对策建议。 相似文献
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以长江经济带124个地级市、自治州和2个直辖市为研究单元,用专利授权量表征创新产出,运用标准差、变异系数、ESDA和空间计量经济模型等方法对1986—2014年长江经济带创新产出的时空演变特征及形成机制进行探讨。研究表明:(1)长江经济带创新产出的绝对差异在2001年以前增加缓慢,其后迅速拉大,2012年后明显下降;相对差异在1994年以前大致呈下降趋势,其后缓慢增加,2002年后增加显著,在2003年达到最高点,2009年后出现明显的下降。(2)长江经济带创新产出高的地市数量变化不大,分布较为集中,但有向中部地区蔓延的趋势,主要位于长三角地区及中西部的省会城市。(3)长江经济带创新产出的空间关联特征以正相关为主,空间集聚特征明显且空间格局大致稳定,长三角地区一直都是创新产出密集聚集的地区,而中西部地区大多是低低集聚地区,高低集聚的地市主要是中西部一些省会城市区。(4)空间交互作用是长江经济带创新产出产生空间差异的重要原因,科技投入和科技政策对长江经济带创新产出具有显著影响,经济发展、人才资源、FDI及通讯基础设施对创新产出也具有较大影响,传统基础设施对创新产出作用最小,而外资在区域经济中的渗透程度对创新产出具有抑制作用。 相似文献
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运用考虑非期望产出的SBM模型,在测度长江经济带沿线102个城市2004-2018年绿色创新效率的基础上,构建中介效应模型实证分析外商直接投资在环境规制对绿色创新效率影响的中介效应,并基于门槛回归模型,综合考察环境规制在不同FDI发展水平下对长江经济带沿线城市绿色创新效率的影响机制。研究结果表明：(1)研究期内,长江经济带102个城市的绿色创新效率存在较大的空间非均衡性,长江上游和长江中游的绿色创新效率基本保持稳定,长江下游的平均绿色创新效率呈现出不断上升的趋势。(2)加强环境规制,对于绿色创新效率具有显著促进作用,外商直接投资在环境规制对城市绿色创新效率的影响中具有部分中介作用,政府加强环境规制可以在一定程度上有效限制污染型行业外商直接投资的流入,从而促进长江经济带沿线城市进一步提升城市绿色创新效率。(3)在不同FDI发展区间内,环境规制对长江经济带沿线城市绿色创新效率的影响方向并不相同,存在双门槛效应,跨过第一门槛值8.293后,环境规制对城市绿色创新效率由促进作用变为抑制作用,跨过第二门槛值11.695后,环境规制对城市绿色创新效率又再次变为促进作用。 相似文献
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运用考虑非期望产出的SBM模型,测度长江经济带沿线102个城市2004-2018年绿色创新效率,构建中介模型分析外商直接投资在环境规制对沿线城市绿色创新效率影响下的中介效应,并基于门槛回归模型考察环境规制在不同FDI发展水平下对城市绿色创新效率的影响机制.研究表明,长江经济带沿线城市的绿色创新效率存在空间非均衡性;加强环境规制对沿线城市绿色创新效率具有显著促进作用,FDI在其中具有部分中介作用;环境规制对长江经济带沿线城市绿色创新效率的影响基于FDI存在双门槛效应,呈现"N形"非线性关系. 相似文献
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为实现我国城市发展的绿色转变,以长江经济带37个城市为研究对象,基于超效率SBM模型和GML指数评价城市绿色创新效率及其时序动态演变规律,并运用空间杜宾模型检验不同区域效率的制约因素.研究表明:长江经济带城市绿色创新效率整体上升,下游、上游和中游从高到低依次排列,区域差距悬殊;中游地区技术进步优于上游地区,但技术效率有较大提升空间;整体上邻近城市绿色创新效率提高会对本城市产生正向溢出效应,但中游地区的溢出效应为负;整体上经济发展、产业升级和城市开放均促进绿色创新效率提升,环境规制与效率呈"U"型曲线关系,但在不同区域各因素的表现具有显著差异.并为长江经济带平衡环境保护和经济增长以及实现区域协同发展,从建设协调发展带、改进地方政策实施理念和继续推进对外开放等方面提出对策建议. 相似文献
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文章引入旅游资源禀赋、旅游规模、旅游服务能力和区域经济发展水平,构建入境旅游经济空间关联修正模型对珠江-西江经济带11个城市入境旅游经济关联强度时空演变进行分析,研究得出：(1)将珠江-西江经济带入境旅游空间关联强度按大小划分为5个等级：微弱关联、弱关联、中关联、强关联和极度关联,整体关联强度较低,但在逐年增强;(2)在珠江-西江经济带入境旅游经济空间关联网络中,广州为区域中心,南宁和柳州成为区域副中心,形成了“三角形”的空间网络结构,空间关联网络密度在不断上升,但上升空间较大;(3)珠江-西江经济带入境旅游经济空间网络大致可以分为：由广州、佛山和南宁组成的板块一;由肇庆、云浮和梧州组成的板块二;柳州和贵港组成的板块三;百色、来宾和崇左组成的板块四。 相似文献
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选取2011-2020年长江经济带11省市面板数据,基于超效率SBM模型与Dagum基尼系数,对长江经济带科技创新效率情况进行评价,并对其科技创新均衡发展路径进行研究,结果显示：长江经济带科技创新效率并未实现整体上各省市DEA有效,存在着非均衡的发展趋势;其上、中、下游区域科技创新效率呈现“两头高、中间低”现象,存在着空间集聚性差异。进一步分析发现,造成非均衡发展趋势问题的主要原因是长江经济带上、中、下游区域之间科技创新发展的差距,且上游与中游区域间创新发展差距最大。因此,提出构建跨区域协同创新系统,以期实现长江经济带科技创新协调发展,进而促进长江经济带形成整体创新驱动发展的新局面。 相似文献
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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
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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
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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
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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
15.
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
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《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
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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
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《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.
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
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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