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浅议结构抗震设计思想的发展 总被引：1，自引：0，他引：1
对结构的抗震设计理论的发展历程进行了归纳和整理,对静力理论分析阶段、反应谱理论阶段、动力理论阶段三个阶段的理论研究和设计方法进行了分析和阐述。介绍了现代抗震设计方法,即基于性能的抗震设计理论,并与传统的抗震设计理论进行了对比分析,得出了其先进性和优点,其必将成为建筑抗震设计思想的核心和发展方向。 相似文献
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赵丹 《科学技术与辩证法》2011,28(1):34-39
测量总是与理论语境相关,测量与理论间的互动促进了科学理论的发展。文章首先区分了测量理论语境的不同层次,然后以斯特恩-盖拉赫实验为例,论述了其原理理论语境——旧量子论,操作理论语境——电磁理论,与解释理论语境——量子力学;最后分析了理论对于测量的制约、生成和解释作用与测量对于理论的反作用,包括检验功能和再语境化功能。 相似文献
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主要阐述了费雪效应理论及其悖论,然后介绍了能够解释该悖论的两个主要理论一代理假说理论和波动性假说理论,并对这两个理论进行了评价和比较。 相似文献
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传统国际贸易理论以相对比较成本为基础,分析和解释了国际贸易和国际分工的动因和过程,这一理论曾一度占据着国际贸易主导理论的地位。但是,经济全球化的进程使得这一理论成立的基础发生了改变,促成了新国际贸易理论的形成。 相似文献
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基于顾客导向的图书馆内部营销管理探讨 总被引：8，自引：0，他引：8
内部营销理论是一种被服务企业广泛运用的管理理论和方法。阐述了内部营销理论的基本概念和理论核心,探讨了内部营销理论在图书馆管理中运用的基本思路,揭示了图书馆实施内部营销的有效途径和作用。 相似文献
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品牌价值来源及其理论评析 总被引：7，自引：0，他引：7
品牌价值来源经历了从品牌资产理论到顾客价值理论,再到利益相关者价值理论的演化过程.其中,资产价值理论强调品牌作为企业无形资产所带来的收益价值;顾客价值理论强调品牌为顾客带来的功能价值和情感价值;利益相关者价值理论则强调品牌是实现利益相关者价值的一种承诺.通过对以上三种品牌价值来源的理论基础及思想特征进行了探索,得到的结论是:不同品牌价值理论都表达了不同的品牌价值来源,代表着不同的品牌理论研究视角,隐含着品牌塑造实践的不同理念和管理行为;利益相关者价值理论并非是对资产价值理论和顾客价值理论的否定,而是兼容,它代表了品牌理论发展和品牌塑造实践的必然趋势. 相似文献
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自我决定理论由认知评价理论、有机整合理论、因果定向理论、基本心理需要理论、目标内容理论和关系动机理论等6个子理论构成,以基本心理需要为核心,系统阐释了人类行为的动机。对自我决定理论的研究前提、主要构成及应用领域进行了系统梳理,并指出了自我决定理论的不足和未来研究方向,以期为国内学者进一步应用自我决定理论开展研究提供借鉴。 相似文献
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我国科技企业孵化器绩效评价的理论基础研究 总被引：1，自引：0，他引：1
在对我国科技企业孵化器的非营利性和绩效评价动因分析的基础上,提出了科技企业孵化器绩效评价的五大理论基础:超产权理论、委托一代理理论、资源依赖理论、利益相关者理论和顾客满意度理论,并对五大理论基础的适用性进行了初步探讨. 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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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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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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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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《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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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