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1.
随着社会经济的飞速发展,天然气已逐渐走进社会的千家万户。燃气管道是输送天然气的主要通道,其质量的高低直接关系着燃气工程是否安全。天然气管道的泄漏不仅会对社会经济造成重大损失,甚至还会对人身造成伤害。因此必须高度重视燃气工程的管道安装。本文结合多年的实践经验,并根据我国现阶段燃气工程管道安装特点,对城镇燃气工程管道安装的重要性、燃气管道结构特点、燃气管道的设计要点以及管道安装工艺流程进行浅析。 相似文献
2.
文章分析了老旧小区燃气管道改造的必要性和迫切性,以合肥市老旧小区燃气改造工程为例,总结了目前老旧小区在燃气管道设计和施工过程中面临的问题与困难,提出了相应的改进措施和施工意见,为老旧小区的燃气改造设计以及后期的施工提供参考。 相似文献
3.
随着我国石油天然气工程的不断发展,燃气管道和长输管道在输气工程中得到广泛应用。因此,对燃气管道和长输管道的质量有着极高的要求,在实际工程中常用射线检测的方法对燃气管道和长输管道的内部质量进行检测和评定。本文就射线检测中的燃气管道和长输管道射线检测标准的运用进行论述对比分析,主要从射线检测工艺和底片评定方法两大方面进行阐述,介绍NB/T47013-2015、SY/T4109-2013这两个标准的运用特点,致力于提高射线检测的实用性及可操作性,从而提高管道焊缝的质量,保证燃气管道和长输管道在输气工程中的质量安全。 相似文献
4.
燃气管道的设计与施工是造福千家万户的事业,在有可能的条件下,应使设计更合理、周到,尽量使各家各户都满意。燃气管道晴埋能使家居环境更整洁、更实用,符合社会发展的趋势,就得到广泛的尝试、推广。住宅室内燃气管暗埋是现代住房发展的必然趋势。由于国家颁布的《城镇燃气设计规范》对住宅室内燃气管道暗埋没有明确规定。故至今在室内燃气管道设计仍以明敷为主。从事燃气设计工作多年,对燃气管道暗埋的设计和施工方面总结出几点心得,供大家参考。 相似文献
5.
燃气管道作为城市发展中的一项基础性设施建设,重要性不言而喻。然而,在城市燃气管道的设计以及施工的过程当中,经常会有一些问题出现,因此,城市燃气管道设计及施工的管理工作非常重要。本文结合了城市燃气管道安装的特点以及当前存在的问题对成绩燃气管道设计的管理工作进行了探讨。 相似文献
6.
燃气和电力是当前城市建设与发展的重要基础资源,是提高人们生活质量的重要能源,燃气管道以及电气设备也就成为人们日常生活中必不可少基础设施工程。随着社会的发展以及经济水平的提高,我国城市化进程不断提高,这也就加大燃气管道的敷设工程量。在管道敷设的过程中,由于受到各种条件的影响,极容易在敷设过程中发生爆炸,直接威胁到人们的生命安全。本文就燃气管道设施的敷设技术进行全面分析,以供参考。 相似文献
7.
《内蒙古科技与经济》2017,(20)
对城市燃气管道设计与施工的若干问题,如管道间距问题、管道焊接问题、地基下沉问题、燃气管道穿越道路与铁路问题和城镇燃气管道压力试验和吹扫问题进行了分析探讨。 相似文献
8.
在住宅燃气管道设计中,需要处理好建筑沉降及其补偿、立管应力及其补偿、支架与穿墙保护设计、附加压力与供气方式选择等工作.在布置室内燃气管道系统时,需要重点加强燃气立管设计和室内燃气管线布置. 相似文献
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10.
管道燃气工程属于城市基础设施建设范围,编制燃气专项规划对落实气化站预留用地及主要中压管道走向具有重要意义.结合城市总体规划,科学高效的编制燃气工程专项规划,实现环境、资源与社会经济的协调发展. 相似文献
11.
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
13.
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
14.
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
15.
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
16.
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
17.
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
18.
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
19.
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
20.
《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