共查询到20条相似文献，搜索用时 250 毫秒
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地铁车站基坑施工会对周围土层造成扰动,对邻近敏感建筑物造成影响。本文以常州市轨道交通1号线定安路站深基坑为例,分析计算地铁车站深基坑开挖对邻近敏感建筑物的影响。研究结果表明,当基坑开挖使周边建筑物的变形沉降超出限值时,采用袖阀管对建筑物基础进行注浆加固,能有效控制建筑的变形沉降。 相似文献
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针对城市地铁车站工程施工场地狭小、周边环境条件复杂、且基坑距周边建筑物距离较近、基坑开挖深度17m等情况,从实际出发,根据工程地质及地下水位情况,在基坑开挖中采取了管井降水方式,保证基坑无水作业,施工取得了较好的效果。 相似文献
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张中岳 《内蒙古科技与经济》2008,(22)
地下建筑物外墙采用单侧支模来完成混凝土浇筑,混凝土形成质量很难保证。地铁车站一般建在城市繁华地段,在原有城市规划的基础上修建地铁车站,施工场地必定很狭小,基坑直壁开挖,限制条件要求外墙施工采取单侧支模。文章介绍了经过施工方案优选,采取单侧模板支撑体系作为模板支架,以保证外墙施工质量的工艺过程。 相似文献
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在复杂地质条件下对地铁深基坑开挖时，结合对其周围建筑物基础加固施工，介绍了楼房基础加固的方案选择、施工过程和施工工艺。 相似文献
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临近已有地铁出入口通道进行人行地通道施工是相当复杂的过程,开挖过程会导致周围重要基础设施和建筑物产生不同方向的附加位移及塑性变形区域,可能对结构的功能和安全造成危害。城市地下交通开挖对周边建筑物的影响控制是地下施工的重大技术难关。本文以重庆渝北区府广场某人行地通道为研究对象,采用MIDAS/GTS软件,通过典型剖面二维数值计算及考虑空间效应三维数值计算,分析拟建项目在建设过程中所引起轨道结构变形情况,评定轨道交通结构的安全性。为以后类似工程提供参考。 相似文献
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某深基坑开挖工程,在地铁安保区作业,项目紧邻地铁2号线、10号线,基坑开挖对地铁安全运营影响大。本次施工的内容为基坑加强措施,邻近地铁侧地连墙接缝处的MJS工法桩。该区域临地铁车站地连墙接缝处的MJS工法桩止水工程质量是决定基坑安全的关键环节。通过监理严格要求,本工程加固止水效果显著。 相似文献
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武汉地铁二号线宝通寺地铁车站位于繁华的武珞路上,地铁车站地质较硬,车站开挖深度7m以下为中风化或微风化岩石,强度较大,抗压强度约位25Mpa,开挖难度很大,且工期紧,为确保轨道交通二号线顺利通车,必须采取效率高的开挖方案,经施工各方研究,并请专家论证,决定采用爆破方案,因工程位于武汉繁华市中心,工程周边为高楼和旅游景点,必须采用有效有力监测为施工安全提供保障,通过对爆破振动监测控制,阐述了中心城区爆破施工监测的控制要点。 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