期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
北京地铁呼家楼站重大风险点分析与监控
1
作者 娄学军 《建筑安全》 2010年第6期39-41,共3页
本文是作者参加北京地铁呼家楼站建设中的工作经验,供同仁们工作中参考。北京地铁呼家楼站范围内地下管线、周边建筑物众多,主体穿越东三环上的京广立交桥和朝阳北路,车站主体与φ1250mm和φ700mm污水管线东西走向平行、其中φ1250mm污... 本文是作者参加北京地铁呼家楼站建设中的工作经验,供同仁们工作中参考。北京地铁呼家楼站范围内地下管线、周边建筑物众多,主体穿越东三环上的京广立交桥和朝阳北路,车站主体与φ1250mm和φ700mm污水管线东西走向平行、其中φ1250mm污水管线底部距车站主体顶部仅0.96m,暗河南北走向穿越车站主体,最近处相距仅2.5m左右。地面交通十分繁忙,车流、人流密度大。 展开更多
关键词 地铁 风险点 监控 量测信息分析
下载PDF
大规模风电并网对互联电力系统低频振荡影响研究 被引量:6
2
作者 杨悦 李国庆 《太阳能学报》 EI CAS CSCD 北大核心 2017年第10期2665-2674,共10页
应用模态分析法研究改变风电场调度方式、机端电压控制环节以及风电渗透率,含大规模风电场的互联系统低频振荡特性;对基于相空间重构的小波算法进行改进,改进后的基于相空间重构的小波算法所需数据量小,具有较高的识别精度和较好的抗噪... 应用模态分析法研究改变风电场调度方式、机端电压控制环节以及风电渗透率,含大规模风电场的互联系统低频振荡特性;对基于相空间重构的小波算法进行改进,改进后的基于相空间重构的小波算法所需数据量小,具有较高的识别精度和较好的抗噪能力,能够揭示出受到噪声污染的微弱信号内在动力学特性;应用基于相空间重构的改进小波算法对互联系统联络线实测功率进行分析,与模态分析结果互为验证。结果表明,风电场调度方式与风电渗透率的变化会影响区域间低频振荡,而机端电压控制环节对区域间低频振荡影响不大。增加风电机组出力,并协调同步发电机组控制有助于增大区域间低频振荡阻尼,提高含大规模风电场的电力系统稳定性。 展开更多
关键词 大规模风电场 低频振荡 阻尼比 基于实时量测信息分析 模态分析
下载PDF
Measuring Spatial Differences of Informatization in China 被引量:2
3
作者 SONG Zhouying LIU Weidong +2 位作者 MA Li Michael DUNFORD 《Chinese Geographical Science》 SCIE CSCD 2014年第6期717-731,共15页
As the wide application of new Information and Communication Technologies (ICTs) shows, the world is moving fast to- wards an information age. Since China was first connected to the Internet in 1994, the development... As the wide application of new Information and Communication Technologies (ICTs) shows, the world is moving fast to- wards an information age. Since China was first connected to the Internet in 1994, the development of ICTs in China and around the world has been astonishingly fast, and yet there is a clear 'digital divide' among different regions in China. Although Chinese geogra- phers have paid attention to regional differences in informatization, they usually employ a limited number of indicators, mainly focusing on the Intemet. In fact, infi^rmatization is a much broader concept, covering not only the lntemet, but also mobile phones as well as user ability. In the light of these considerations, this study provides a comprehensive examination of the development of informatization and its spatial differences in China. First, based on a literature review, the paper identifies 29 preliminary indicators for measuring informa- tization, and employs prin,-ipal components analysis and the fuzzy analytic hierarchy process to streamline them into 12 indicators to form an ICTs Developmen: Index (ID1). Second, by using the data from provincial statistical yearbooks and the China Internet Network Information Center, the paper calculates the 1191 of each mega-region and each province in 2000-2010, and measures the changing spa- tial differences in the development of informatization in China. Lastly, the paper quantifies the relationship between informatization and economic growth. The empirical results show that the IDI of the western and central China has been increasing faster than that of the coastal region, indicating that the digital divide in China has been narrowing. 展开更多
关键词 informatizatiort Information and Communication Technologies (ICTs) Development Index (ID1) spatial ditlbrence digital divide
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部