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基于中国30个省区2001-2010年整体面板数据及分组面板数据,本文使用联立方程模型研究经济增长、外商直接投资和能源消费之间的关系。经验研究发现：(1)对于全国组,经济增长和外商直接投资、经济增长和能源消费之间存在双向因果关系,从外商直接投资到能源消费存在单向因果关系;(2)对于高人均地区生产总值省区组,经济增长和外商直接投资之间存在双向因果关系,从经济增长、外商直接投资到能源消费存在单向因果关系;(3)对于中等人均地区生产总值省区组,经济增长和外商直接投资、经济增长和能源消费之间存在双向因果关系,从外商直接投资到能源消费存在单向因果关系;(4)对于低人均地区生产总值省区组,经济增长和外商直接投资之间存在双向因果关系,从经济增长、外商直接投资到能源消费存在单向因果关系。这些研究结论对于决策者制定经济政策有非常重要的参考意义。 相似文献
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基于生产函数的中国能源消费与经济增长的多变量协整关系的分析 总被引：4，自引：0，他引：4
本文基于生产函数的多变量分析,以1978年-2008年样本区间数据为基础,利用Johansen-Juselius协整检验法和基于向量误差修正模型的短期、长期Granger因果关系检验,研究了我国经济增长、能源消费、资本存量和人力资本投入这四个变量之间的协整关系和Granger因果关系。实证研究结果表明:1978年至今,我国经济的增长与能源消费总量、资本存量和人力资本的投入之间存在长期的协整关系。而且研究表明:短期内并不存在能源消费与经济增长之间的单向或双向Granger因果关系。但是长期来看,它们之间存在单向Granger因果关系:经济增长是能源消费的Granger原因。据此说明:我国目前的经济增长并不是很强的能源依赖型体系。最后,从我国经济可持续发展的视角,对我国的能源消费和经济增长模式提出了一些建议。 相似文献
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采用我国东西部地区的省级面板数据,运用面板数据协整分析、Granger因果关系检验及误差修正模型,对我国东西部地区的经济增长和能源消费关系进行比较研究.实证结果表明,我国东西部地区经济增长和能源消费之间存在协整关系,并且存在长期的Granger因果关系,但西部地区不存在短期的Granger因果关系,即东部地区经济增长与能源消费之间的关系较之比西部地区更为密切.在研究结果的基础上提出了促进我国区域经济和能源协调发展的政策建议. 相似文献
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经济增长与外商直接投资的因果关系分析 总被引：9，自引：0，他引：9
本文应用协整关系检验和格兰杰因果关系检验法，研究改革以来中国的经济增长与外商直接投资的关系。研究结果表明，中国的经济增长与外商直接投资增长之间具有双向因果关系，但国内生产总值与外商直接投资之间不存在长期稳定关系，即不存在协整关系 相似文献
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本文分区域选取了中国29个省、自治区和直辖市1995年-2007年的三次产业的增长与其能源消费的数据,将经济增长与能源消费的产业差异与区域差异作为整篇文章研究的主线。文章运用面板单位根检验及协整检验,在此基础上建立了面板数据的长期均衡模型和格兰杰因果检验模型。实证结果表明：在东部地区,第一产业和第二产业的经济增长和能源消费之间存在单方向的格兰杰因果关系,而第三产业的产值水平和能源消费之间的格兰杰因果关系却非常不明显在中部地区,三次产业的经济增长和能源消费之间存在单方向的格兰杰因果关系,而三次产业整体上从能源消费到经济增长的格兰杰因果关系却非常不明显;在西部地区,三次产业和能源消费之间的格兰杰因果关系非常不明显。最后基于面板数据实证结果分区域地提出了各产业的调整策略。 相似文献
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本文运用面板计量分析方法,利用中国八大经济区域1986－2008年的相关数据考察了各区域能源消耗与经济增长之间的关系。实证研究结果表明:从长期来看,东北地区、北部沿海地区、南部沿海地区和黄河中游地区的能源消耗与经济增长存在双向因果关系,而长江中游地区、西北地区和西南地区仅存在单向因果关系;从短期来看,东北地区和西南地区的能源消耗与经济增长不存在因果关系,北部沿海地区、长江中游地区、西北地区、南部沿海地区和黄河中游地区仅存在单向因果关系。此外,东部沿海地区无法判断。最后,在实证结果基础上,本文提出了政策建议,这对各区域能源和产业政策的制定有借鉴意义。 相似文献
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基于协整关系的中国区域煤炭消费与经济增长比较研究 总被引：2，自引：1，他引：1
运用时间序列截面数据模型的计量分析方法及协整检验理论,对我国东部、中部及西部三个地区的煤炭消费与经济增长之间的协整关系进行了实证研究。研究结果表明：东部地区煤炭消费与经济增长之间具有稳定的长期均衡关系,但其关系是由经济增长到煤炭消费的单向关系;中部地区煤炭消费与经济增长二者之间既具有明显的双向长期因果关系又具有双向短期因果关系;西部地区煤炭消费与经济增长之间虽然存在长期协整关系,但短期因果关系并不成立。在此基础上,结合对全国和各地区1986年～2004年间的经济增长、能源及煤炭消费水平的分析,认为各地区煤炭消费与经济增长的关系之所以存在明显差异,主要是受到经济发展水平和经济运行机制等的影响;提出国家在相关经济政策和煤炭政策的制定及执行时必须正视这一差异,特别是在西部大开发的进程中,当务之急是要协调好煤炭（能源）与经济的发展关系,否则会加剧中国经济发展的区域失衡。 相似文献
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中国资源消耗与经济增长动态关系的检验与分析 总被引：2，自引：1，他引：1
随着人口继续保持增长、城市化进程进一步加快、经济结构进入快速转型期,各省经济要保持平稳较快的发展,必然会对自然资源产生更大的需求、对生态环境造成更大的压力。因此,对各地区经济系统的资源投入与消耗进行分析,对认清各省经济发展过程中的资源利用现状、调整可持续发展政策方向具有很强的现实意义。本文基于物质流核算框架下的物质投入核算方法,选取1990年-2008年数据,利用面板协整与误差修正模型对中国省级层面资源消耗与经济增长之间的动态关系进行了研究。研究结果表明:资源消耗与经济增长之间存在长期双向因果关系;化石能源消耗与人均GDP之间存在长期双向因果关系;矿物质消耗与人均GDP之间短期无因果关系;生物质消耗对人均GDP存在长期单向因果关系。并提出建议:短期内可采取控制矿物质消耗的政策;长期应采取化石能源的保护政策,大力开发生物质能源。 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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《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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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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《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
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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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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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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
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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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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