对二芳基乙烷绝缘油tanδ值影响的探讨

影响液体介质绝缘油的介质损耗因数tanδ值是多方面的、在测试中各种因素的影响桂林电科所袁明珍、吴试矛等同志已做了大量的试验研究工作,并发表在本刊85年第5期上,以后又制订了相关国家标准即GB5654。本文仅就二芳基乙烷绝缘油(以下称S油)在包装、取样、运输、贮存等生产后的质量管理方面进一步叙述影响绝缘油tanδ值的因素。     

瑞典斯德哥尔摩建设可持续的紧凑城市

The case concerns Stockholm‘s past, recent and future planning strategies towards developing an environmen-tally sound leading edge city in the “IT and wireless communication industry“. The overall goal is continued city growth and development whilst preserving and enhancing the city‘s unique characteristics. The City of Stockholm‘s initiatives in environmental management and urban planning were recognized as a good practice in 1998 and 2000.     

域外传真

Bluetooth将失去成为短距无线通信领域最新发明的机会几年前，《WirelessAsia》杂志曾发表过一篇名为“Redbeard”志曾发表过一篇名为“Redbeard”的虚拟技术专栏文章，认为该技术有可能会用无线兆位连接取代电缆连接组网设备。该文描写了一次虚拟的贸易展览会，展出虚拟Redbeard示范产品，以显示该技术的真实性及工作状况。关键之处是参展的所有无线Redbeard设备均是通过电缆连接。你可能已经猜出Redbeard是Bluetooth的伪装版本，这篇文章的灵感来自一次贸易展览会上展出的一件被大肆宣传的Bluetooth示范产品，文章的作者觉得很奇怪，…     

光纤接入网远端供电方式探讨

本文针对接入网实施方案中存在的接入网远端设备供电问题展开讨论,分析了传统供电方式的弊病,提出了远端供电方案,并且作了技术、经济及安全方面的分析。     

坦桑尼亚达累斯萨拉姆的环境规划与管理

The Environmental Planning and Management (EPM) approach was introduced in Dares Salaam in 1992.Since 1998 the concept is being replicated in all the Municipalities in the country. Overall, the programme is benefiting more than 50 percent of the urban population in the country. The two initiatives presented-the Hanna Nassif Community-Based Upgrading which adopted an innovative approach in both its institutional setup and the use of labour-intensive community contracting and community management, and the solid waste management initiative involving private and community-based collection methods, both of which build capacity within the community for the improvement of infrastructure as a means of reducing poverty, illustrate some of the achievements and imoacts realized and lessons learnt.     

国外作战无人机

本简要介绍了国外无人机的发展现状，内容涵盖美国、瑞典、法国和西欧联合研制的作战无人机项目，详细介绍了当前国外先进作战无人机研制的进展、主要机型及其基本战术技术参数等情况。     

波兰卡托维兹城市群的环境管理与城市发展

The Katowice experience focuses on the issue of brownfield remediation and how a local authority addressed issues related to the rehabilitation and re-use of industrial sites, and solid waste and sewage management in revitalizing the urban environment. The Katowice agglomeration is considered an exceptional area in Poland owing to its environmental and spatial conditions. The agglomeration is the most urbanized, industrialized and densely populated region in the country. The article introduces the experience of environmental management and city development in the Katowice agglomeration.