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当前社会实现可持续发展所面临的关键问题是生态安全问题,而生态安全研究的重点是生态安全预警。针对山东半岛蓝色经济区生态环境特点,从生态安全预警角度,利用熵权和可拓学理论,建立基于S-T-R模型的山东半岛蓝色经济区生态安全预警指标体系,通过预警指标阈值的确定,定量化分析该区域生态安全状况。运用该模型对山东半岛蓝色经济区历史时序(2003~2013年)及规划年份(2016年)的生态安全进行定量评估和预警。研究结果表明：2003~2013年山东半岛蓝色经济区生态安全状况呈现出逐渐好转趋势,但生态安全整体水平处于“安全”状态以下。2016年经济区生态安全为“无警状态”,同时有向“轻警状态”发展的趋势,能源消耗、水资源短缺、工业“三废”等是影响山东半岛蓝色经济区生态安全进一步好转的主要因素。 相似文献
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运用熵权正态云理论,建立了基于S-T-I模型的山东半岛蓝色经济区生态安全预警模型,对山东半岛蓝色经济区历史时序(2004~2014年)及规划年份(2017年)的生态安全进行定量评估和预警。结果表明:2004~2014年区域生态环境从"较差状态"到"一般状态"再到"良好状态",总体呈逐渐好转的态势,但整体生态安全水平仍较低,均未达到"理想状态"。2017年区域生态安全为"良好状态",且具有向"一般状态"发展的趋势,大气污染、水污染、工业"三废"等是影响区域生态安全的主要短板因素。 相似文献
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基于NC-AHP的区域生态安全评价与预警——以黄河三角洲高效生态经济区为例 总被引：1，自引：0，他引：1
针对生态安全演变过程中存在的随机性与模糊性问题,提出基于NC(正态云)-AHP的综合分析模型,综合考虑生态环境状态、生态环境胁迫及生态风险免疫3方面影响因素构建区域生态安全指标体系,运用该模型对黄河三角洲高效生态经济区历史时序年份(2003—2013年)及规划年份(2016年)的生态安全进行定量评估和动态预警。结果表明:2003—2013年黄河三角洲高效生态经济区的生态环境从"危险"状态到"敏感"状态再到"良好"状态,呈现逐渐好转的态势,但整体生态安全水平仍较低,均未达到"安全"状态;2016年区域生态安全为"良好"状态,且具有向"敏感"状态发展的趋势,大气污染、水资源短缺、能源消耗、工业"三废"等是影响区域生态环境的主要短板因素。 相似文献
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针对生态安全演变过程中存在的随机性与模糊性问题,提出基于NC(正态云)-AHP的综合分析模型。综合考虑生态环境状态、生态环境胁迫及生态风险免疫三方面影响因素构建区域生态安全指标体系。运用该模型对黄河三角洲高效生态经济区历史时序年份(2003~2013年)及规划年份(2016年)的生态安全进行定量评估和动态预警。结果表明：2003~2013年区域生态环境从“危险”状态到“敏感”状态再到“良好”状态,呈现逐渐好转的态势,但整体生态安全水平仍较低,均未达到“安全”状态。2016年区域生态安全为“良好”状态,且具有向“敏感”状态发展的趋势,大气污染、水资源短缺、能源消耗、工业“三废”等是影响黄河三角洲高效生态经济区生态环境的主要短板因素。 相似文献
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构建了以山东半岛蓝色经济区为例的经济-环境复合系统发展系统动力学模型,运用VENSIM软件对区域未来发展情景进行定量化动态研究与模拟.通过调节复合系统的决策变量,设定了4种不同的发展情景方案,预测在不同情景方案下山东半岛蓝色经济区的发展状况,得出山东半岛蓝色经济区经济-环境复合系统协调发展的最优方案,为山东半岛蓝色经济区的规划、治理和发展提供决策支持. 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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《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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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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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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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 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