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1.
地震对建筑物或工程设施的破坏作用是通过场地地基和基础传递给上部结构的。场地和地基在地震时起着传播地震波和支承上部结构的双重作用,因此,建设场地和地基的抗震性能,直接影响着建筑物的抗震性能。在建筑抗震设计中,地面振动作用是通过基础和上部结构的抗震验算和采取措施进行抵抗 相似文献
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目前我国存在着大量抗震设防、抗震性能欠佳的建筑物,为了能够确保这些建筑安全使用并发挥其应有的建筑功能,要对其进行抗震鉴定及加固。本文分析了我国建筑物的抗震加固技术方法,对优于传统抗震加固方法的隔震加固方法进行了重点分析,并指出隔震加固方法更加适合现代建筑的抗震设计。 相似文献
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设计建筑结构时,应当加入对建筑物的抗震性能的设计,所以需要结构抗震的相关概念设计,这种概念设计是为了控制建筑结构的抗震性。针对地震发生时的征象与特点,本文将详尽阐释建筑结构中的所需要的概念设计性的问题,与其各方面的结构设计应用。同时希望本文可以对别的建筑工程的设计有所帮助。 相似文献
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在建筑结构的设计中要求设计人员融入抗震元素,建筑出抗震性能高的建筑物,保证人员生命和财产安全。在现代的建筑设计中,加强和完善建筑结构设计中的抗震设计,是目前建筑设计中需要解决的首要问题,本文将以地震的特点和危害为切入点,对建筑设计中如何加强抗震设计进行探讨与研究。 相似文献
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为了保证建筑结构中的抗震设计能有效地完成,应该科学合理的设计和遵循相关建筑抗震规范要求的元则之上,保证建筑物的稳定性能,使建筑物在任何情况下都能完善的保持良好状态。随着社会相关的发展,我相信抗争设计水平会不断地提高,我们国家的建筑结构抗震设计也会发展更好,使我国的建筑物更加牢固。 相似文献
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隔震技术作为工程设计领域的新兴学科,具体涉及结构振动理论、综合控制理论、新材料科学技术等国际先进技术。隔震技术往往采用系列隔离与控制措施,减轻或抑制受到地震作用的建筑物结构的动力反应,进而实现结构抵抗外界的振动能力的提高,同时实现建筑结构安全性与舒适性的提高。文章着重介绍既有框架结构加固方面隔震技术的应用,以期实现建筑结构抗震设防能力的提高。 相似文献
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若建筑结构的抗震性能相对较低,一旦有强烈等级的地震发生,将会造成重大的人员伤亡和财产损失。因此,建筑结构抗震性能的提高必须得到相关技术人员的重视。本文首先从建筑物的场地选入手;接着从结构设计方面进一步介绍了建筑物抗震性能提高的三点方法,即建筑结构规则性的提高、建筑物刚度及整体性的增强以及建筑结构的延性能力的保证;最后,还从施工管理方面加以防治;以期能从这三个方面达到提高建筑结构的抗震性能的目的。 相似文献
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随着城市现代化的不断推进,国内正在大规模的兴建各项高层建筑,由于该建筑对抗震要求比较高,因此,在国内高层建筑的发展历程中,对建筑物的抗震要求以及相关理论研究一直是热点话题.为了能够有效避免高层建筑物短柱中发生脆性破坏的问题,笔者认为,有必要对超限高层建筑的设计原则、途径,以及所采用的抗震措施,进行正确的处理,这样才能彻底的提高建筑物中的短柱的延性以及抗震方面的性能. 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
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
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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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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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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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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