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自动喷水灭火系统是一种在发生火灾时,能自动打开喷头喷水灭火并同时发出火警信号的消防灭火设施.自动喷水灭火系统同时具备了防火、控火、灭火的功能,是国际上公认的最为有效的自动灭火设施,是现代建筑防火技术的重要组成部分. 相似文献
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经济越发展,消防事业也就更加重要。消防事业担负的不仅仅是抢救人的生命安全,同时面对的是抢救社会物质财富和文化财富的重任。消防事业也在社会需求和社会发展的双重作用催化下,不断完善进步。消防灭火根据使用的灭火物质的不同,分为液体灭火、固体灭火和气体灭火,主要介绍的是气体灭火系统、气体灭火的优势和适用范围以及重点介绍气体灭火系统报警及控制的设计要点。 相似文献
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随着我国社会的进步,消防系统越来越受人们的关注,尤其是储物仓库中的灭火系统。在不同环境的建筑灭火系统中,灭火方式和灭火的设施都不相同,当受到建筑面积限制时,需要加设自动灭火系统。如何在保证节能和满足设计要求的同时,更加经济地选择灭火方式,将是本文讨论的重点和难点。本文通过分析自动灭火系统的火灾特点,结合甲、乙类仓库类型,综合介绍自动灭火系统设计的原理,简要分析甲、乙类仓库在自动灭火系统中设计容易出现的问题,以及提出针对此类问题所作出的解决办法。 相似文献
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依据机器人灭火比赛规则,本文设计基于门口检测策略的灭火机器人,在已有机器人的基础上对各种传感器进行科学布局,实现火源门口检测功能。主要实现了避障、寻火、灭火和回家四个模块。实验表明本文的灭火策略的灭火时间大大缩短。 相似文献
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自动喷水灭火系统被普遍应用,但目前也存在很多自动喷水灭火系统不成功的案例,所以研究自动喷水灭火系统可靠性具有非常重要的意义。本文从自动喷水灭火系统的内涵及工作原理出发,重点探讨了自动喷水灭火系统的可靠性。 相似文献
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通过细水雾灭火系统这一新型环保高效洁净的灭火技术在广州地铁APM线的应用案例,阐述了细水雾灭火系统的灭火机理、性能特点,并结合实际使用提出自己的几点思考。 相似文献
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排油注氮灭火系统作为发电站、变电所主变压器广泛使用的消防灭火系统,具有装置占地小、简单可靠、投资维护费用少、灭火效率高、适用性强等优点。但是,一旦发生变压器油箱破裂而流油,在变压器外部发生火灾时,排油注氮灭火系统将不能对其发挥作用。本文参考水喷雾灭火系统特点,在排油注氮灭火系统的基础上,增加主变压器箱外灭火装置,弥补不足之处,提高消防灭火系统的主动性和安全性。 相似文献
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HFC236fa手提式洁净气体灭火器因其洁净、环保、安全无毒、性能稳定被论证为哈龙灭火器的最佳替代品,但其灭火效能还是不能同哈龙1211灭火器相比,本文从其灭火剂组成、灭火器结构、性能、灭火机理、灭火试验效果分析对比论证其灭火效能的关键影响因素,得出其喷射机构、充装压力、喷射时间的长短、灭火环境温度直接影响其灭火效能,特别是喷射机构的合理调整对其灭火效能的影响较大,为提高其灭火效能,需从其影响因素方面进行试验调整和研发,以便使其尽快普及到消防市场上,补缺因哈龙灭火器淘汰带来的安全空缺。 相似文献
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气体消防并不是指扑灭气体物质的火灾,而是指用气体灭火剂灭火。本文简单介绍气体灭火系统的发展过程,并从生命安全、环境安全、灭火效率以及占地面积出发,研究气体消防技术,建立最有效的气体灭火系统。 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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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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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献