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矿业城市是随着矿产资源的开发而形成和发展起来的,矿业城市为我国经济发展提供大量物质保障的同时,其自身的资源、环境及发展问题也更加突出,由此也成为推广和实施循环经济的重点区域和部门。论文以河北省唐山市为对象,分析了该城市资源产业的构成特征及产业发展过程中的资源、环境问题,构建了城市资源产业集群循环经济的总体框架和系统结构流图,并对该系统的不同实施方案进行了仿真优化。研究认为:①矿业城市基于资源开发利用的产业构成,具有明显的沿资源产业链不断演进和提升、形成以资源产业链为主体产业集群的发展规律和特征;②资源产业集群内部在物质流、能量流等方面较强的关联性和依赖性,为矿业城市工业循环经济的规划和实施奠定了坚实的基础;③唐山市资源产业集群的现有发展模式、"十一五"规划模式和循环经济模式均有一定的成效,但循环经济模式运行效果最佳;④唐山市应紧密结合资源产业集群的发展演变特征,全面规划和实施循环经济发展模式,实现城市资源产业的可持续发展。 相似文献
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作为国家循环经济首批试点城市,有必要对铜陵市循环经济的发展特色、发展成效及经验加以总结、提炼,为同类型城市转型发展、走新型工业化道路提供新动力,为全国其他城市发展循环经济提供借鉴.本文以铜陵市循环经济发展的主要指标为研究对象,在铜、硫、石灰石等产业链物质流实证分析的基础上,定量分析了循环经济指标完成情况,研究了以资源产业链为特征的循环经济“铜陵模式”.概括地说,企业减量化,行业的耦合,能量的梯级利用和资源的综合利用体现了“铜陵模式”的核心思想.循环经济“铜陵模式”的研究,既立足于现有产业,又高于现有产业,紧紧围绕现有产业优势,以循环经济新的生产模式、经营理念和管理技术,融入到铜陵市经济社会发展之中. 相似文献
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循环经济是一种强调共生和协同的新型经济运行方式,形成资源循环利用的生态网络是其根本特征。文章以广东双水镇拆船产业发展为案例,分析循环经济产业链的演进过程及其微观运行规律,探讨了产业链耦合的机理,提出了促进循环经济产业链发展的若干对策。 相似文献
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矿产资源型产业集群具有资源诅咒效应显著、产业链短、产业结构单一、可持续性差等风险。陕北能源化工产业在自然资源优势、政策优势和科教优势的基础上,已初步形成以煤炭、石油和天然气开采、加工、利用为核心的矿产资源型产业集群。但由于区位环境和体制因素的影响．陕北矿产资源型产业集群面临自主创新能力弱,产业结构与布局不合理以及环境成本高三种风险。根据陕北地区的实际情况,可以通过提高区域自主创新能力;优化产业结构以及建立循环经济产业因来推动陕北矿产资源型产业集群的持续发展。 相似文献
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《内蒙古科技与经济》2015,(8)
通过分析乌海市煤焦化工产业发展循环经济的现状,指出乌海市煤焦化工循环经济发展中存在着产业链延伸不足、技术偏低,资金投入大、收效慢等诸多问题,提出了建立煤焦化工循环经济领导小组,加强循环经济产业链延伸与技术创新,扩大煤焦化工循环经济产业园区等具体对策,以保障达到乌海市政府在《乌海市工业循环经济产业集群规划》中提出的目标。 相似文献
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产业集群已成为世界信息产业发展的必然趋势,湖南信息产业集群发展初见成效,已经形成四大产业集群,太阳能光伏产业集群高速发展,软件产业集群已具备了一定的规模和市场竞争力,新型显示器件产业集群发展迅速,引进和扶持消费类电子整机产业集群.但也存在着产业链建设总体配套环境较差,缺少完整的产业链;产业关键核心技术较少,企业自主创新能力不强;企业本土“根植性”微弱;依附外资,产业投入力度不大等一系列问题,并提出一系政策建议来促进湖南信息产业集群的发展. 相似文献
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基于资源再生产业特征,从产业集群的形成条件、外部性理论和全球价值链三个不同视角,对资源再生产业集群的成因进行深入剖析,证明了资源再生产业集群完全满足集群形成的必要条件、充分条件、需求条件和社会历史条件;资源再生产业集群是多重外部性的集合体,集群化发展模式是通过市场化机制解决资源再生产业环境正外部性的有效途径,也是加强对资源再生产业二次污染问题的有效管理方式;而从全球价值链视角来看,资源再生产业在发展中国家的集群是"水往低处流"的必然结果,发展中国家融入全球大循环也是必然的趋势,集群化发展模式是资源再生产业发展的必由之路。 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