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张超 《科学学与科学技术管理》2012,33(7):68-76
产品创新是中国工业企业创新升级的一个"自觉"的适应性的策略选择和路径取向。实证分析表明,产品创新、固定资产投资与工业增长之间存在长期均衡关系,但产品创新已经超过固定资产投资成为工业增长的一个更有效率的动力因素。国家和地方政府还需要在重点产品研发和企业产品创新方面,给予更多的投入、支持和激励,使得以产品创新来带动投资、刺激消费和增加出口的增长机制加快成为主要的经济增长机制。 相似文献
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本文从固定资产投资的角度,运用因素分析法,着重分析在西部地区1996—2003年的经济增长中各投资要素,包括固定资产投资额、各部门投资比例和各部门投资效率的影响状况,说明加大固定资产投资力度、调整投资结构、提高投资效率对加快西部地区经济发展,提高经济增长质量具有现实的意义。 相似文献
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区域层面能源消费碳排放的影响因素解析,是有效实现碳减排的重要研究议题。以经典的IPAT模型为基础,采用扩展的STIRPAT环境压力评价模型,对1990-2014年广东省能源消费碳排放的主要驱动因素进行时间序列分析,并定量研究各个驱动因素对于区域碳排放的作用机理与影响机制,主要研究结论如下：各个影响因素对广东省碳排放增长的作用机理与影响机制各不相同,经济增长、固定资产投资和工业发展是碳排放增长的最主要影响因素,人口规模和城镇化对碳排放增长作用显著,技术进步和能源结构是遏制碳排放增长的最主要贡献因子。 相似文献
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基于VAR模型,定量研究我国国内投资、政府消费及居民消费对中国经济增长的影响及出口对经济增长的影响。研究结果表明：短期和中期内国内投资冲击对经济增长具有比较明显的影响：短期内政府消费冲击对经济增长具有明显的驱动作用;从长远看,居民消费是影响我国经济增长的首要因素,其次是国内投资。 相似文献
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中国煤炭消费与影响因素动态关系的实证分析——兼论煤炭消费的非对称价格效应 总被引：4，自引：2，他引：2
本文在建立我国煤炭消费协整方程的基础上,利用状态空间模型技术进一步建立了我国煤炭消费的变参数模型,对1978年-2007年间我国煤炭消费与经济增长及其它影响因素之间的相关关系进行了动态分析,以揭示我国煤炭消费与经济增长相关关系的时变规律。本文在实证分析中不仅考虑了经济增长、产业结构、技术改造、煤炭价格及运输成本对我国煤炭消费的影响,而且还借鉴了Gately(1992)开发的技术,对我国煤炭消费变动的非对称价格效应进行了实证分析。实证分析结果表明经济的持续增长和重工业比重的增加是拉动煤炭消费增长的主要原因,并且经济增长的拉动作用正在逐步减弱,而产业结构特别是工业结构对煤炭消费的影响作用逐步增强。煤炭价格对煤炭消费存在显著的非对称效应,但煤炭消费对煤炭价格变动的敏感性显著弱于运输成本,并且差距呈逐步增加态势。 相似文献
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中国科学院预测科学研究中心宏观经济部 《中国科学院院刊》2017,32(1):64-69
2016年,我国经济增长下行势头减缓,国内生产总值（GDP）增速全年运行平稳,保持在6.7%水平上。物价延续了2015年温和上涨走势,涨幅较2015年同期有所扩大,全年消费价格指数（CPI）约为2.1%。预计2017年我国经济将呈现“稳中略降,稳中向好”态势,全年GDP增速约为6.5%左右。物价继续保持温和上涨的态势,2017年全年CPI涨幅2.3%左右。三大需求中,进出口将继续表现为负增长。以美元计价,预计2017年进出口总额下降约5.4%左右,出口同比下降约6.9%,进口同比下降约3.4%。消费将保持平稳增长,预计2017年最终消费增速在9%左右。投资增速将略有上升,预计2017年固定资产投资增速在8.5%左右。 相似文献
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2006年中国经济整体呈现出“增长速度较快、物价走势平稳、经济效益显著改善”的良好局面。展望2007年,尽管存在世界经济增长减缓、国际国内市场资源品价格居高不下、国内粗放的经济增长方式短期内难有彻底改变等若干不利因素,但中国经济的巨大内在增长动力依然没有改变。经济景气指数分析和计量预测模型均表明,2007年中国经济仍将继续保持高速增长的态势,2007年年底增长速度有可能小幅回落。预测结果显示,2007年GDP增长率约为9.8%,工业增加值增速为15.8%,城镇固定资产投资完成额大约增长23.5%,社会消费品零售总额大约增长14.1%。 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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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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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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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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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
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Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
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Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 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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《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献