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1.
在分析前人关于中国西南岩溶地区水资源研究成果的基础上,依据岩溶学、水资源学和经济学理论及西南岩溶地区水资源的实际情况,提出了岩溶地区流域水资源的概念,深刻分析了其内涵,全面论述了我国西南岩溶地区流域水资源的组成。 相似文献
2.
为提高水资源配置效率,本文从社会、经济、人口及生态环境的可持续发展角度来构建水资源可持续利用指标体系,运用均方差决策法对2007—2012年天津市水资源可持续利用进行评价,并预测了天津市2013—2015年水资源可持续利用状况。结果表明：2007—2015年天津市水资源可持续利用状况有了显著的改善,从较弱—中等—较强—很强状态,但尚未达到完全可持续利用;同时分析并识别出影响水资源可持续利用的主要因素,为水资源与社会经济、人口、生态环境健康协调发展制定科学策略。 相似文献
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为改善水资源可持续利用现状,从水资源系统、社会经济系统、人口系统、生态环境系统四个方面考虑,建立了水资源可持续利用评价指标体系。基于均方差决策法构建了水资源可持续利用评价模型,并对2003-2012年陕西省水资源可持续利用进行评价。结果表明,(1)2003-2012陕西省水资源可持续利用度大体上处于上升趋势。(2)陕西省水资源复合系统可持续利用状态对社会经济子系统依赖程度较高。(3)制约陕西省未来水资源可持续利用的主要因素在于陕西省水资源与人口系统的不协调发展,应引起相关部门的高度重视。 相似文献
4.
西南岩溶地区流域水资源供需影响因素分析 总被引：1，自引：0，他引：1
从岩溶地区流域水资源供给和需求两个方面,分析了我国西南岩溶地区流域水资源供给的气候与大气降水,地形特征,植被与土壤及地质构造,表层岩溶带及岩溶发育程度,水资源产业发展状况及其供水制约,水资源质量等影响因素;分析了岩溶流域水资源需求方面的工业用水,农业用水,城镇居民用水,生态环境用水等的影响因素。 相似文献
5.
选取乌昌地区为研究区域,综合运用频度分析法、理论分析法和专家咨询法构建指标体系,通过层次分析法对乌昌地区能矿资源的可持续利用能力进行评价,得出结论:1)能矿资源规模与供给系统指数呈现明显的波动状态,分别在1999年和2005年形成波谷;2)资源利用的经济效益系统指数基本呈现上升趋势;3)环境压力与环境治理系统指数呈现明显的阶段性上升的特征;4)乌昌地区能矿资源可持续利用的能力指数呈现出平稳上升的趋势.受乌昌地区水资源短缺和生态环境脆弱等因素影响,对能矿资源可持续能力影响最大的子系统为环境压力与环境治理系统.在各指标中,对能矿资源可持续能力影响较大的指标是能矿资源生产总量、水资源利用相关指标以及资源型产业的GDP和资源型产业固定投资比重等. 相似文献
6.
水资源本身是其它资源的基础，对于保持区域生态平衡，减轻自然灾害，确保地区生态环境安全，保障经济发展都具有重要作用。三江平原正由传统农业向生态农业转型，但其水环境问题已成为困扰经济持续发展的焦点。因此，应当对三江平原的水资源利用方向进行深人的研究，重新调整开发利用思路，构建良好的水循环系统，不断提高水资源的贡献率，才能保障生态环境安全，以水资源的可持续利用支持经济社会的可持续发展。 相似文献
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8.
在研究中国西部地区自然地理条件的前提下,从利益分配与水资源治理主体视角出发,分析了西部地区水资源利用中的问题,指出必须积极发挥政府在水资源可持续利用中的主导作用,同时注重加强政府、市场与公共事业组织在水资源可持续利用中的合作,正确处理好水资源开发与水资源保护、水资源利益分配的关系。 相似文献
9.
大连市水资源可持续利用的模糊模式识别及对策研究 总被引：11，自引：1，他引：10
大连是中国北方沿海重要的中心城市和国际风景旅游城市,也是全国重要的缺水城市之一。水资源的可持续利用是大连市社会经济环境可持续发展的关键问题。目前关于水资源可持续利用的前沿研究大都还停留在概念的提供和定性分析上,缺乏量化的理论和方法。模糊模式识别模型通过量化的手段阐明可持续利用的具体方法和途径,使水资源可持续利用具有可衡量性和可操作性。本文首次采用此模型对大连市水资源进行可持续利用分析,结果表明大连全市及大连市区近、中、远期水资源可持续利用级别特征值都有逐年减少,尤其大连市区2010年水资源开发已逐渐接近区域水资源承载力,水资源开发潜力不大,这一结论恰与实际相符,进一步证明了此方法的可行性。最后,提出了大连市水资源可持续利用的对策。 相似文献
10.
西北地区水资源承载力分析预测与评价 总被引：56，自引：3，他引：56
水资源是干旱、半干旱地区社会经济发展和生态环境保护的关键制约因素，水资源承载力的分析计算和评价是干旱、半干旱地区寻求区域可持续发展道路的重要依据。该文探讨了水资源承载力状况的评价方法，建立了水资源承载力评价指标体系，对各评价指标的可承载极限临界值和理想值进行了界定，建立了水资源承载力模糊综合评判模型，并运用之对西北地区现状年及未来10a、20a、50a不同发展情景方案下的水资源承载状况进行了评价。模型预测结果表明，通过生态环境治理、节水技术进步和产业结构调整等综合措施，未来各年段西北地区水资源承载力状况将逐步改善，其中以采用A1+B2+C2发展情景方案将使水资源承载状况综合效果最佳，节约用水、降低水资源开发利用率，提高用水效率和控制人口增长则是提高西北地区水资源承载力水平的关键因素。 相似文献
11.
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
12.
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
13.
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
14.
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
15.
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
16.
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
17.
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
18.
《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
19.
Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels 总被引：1，自引：0，他引：1
《中国科学院院刊(英文版)》2014,(3):267-268
<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese 相似文献
20.
WANG Sijia 《中国科学院院刊(英文版)》2014,(2):192-194
<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages. 相似文献