期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
建筑幕墙工程施工中隐蔽工程验收记录补充附件方法尝试——有平面直角坐标尺的精确记录方法
1
作者 李志华 潘文军 +1 位作者 房燕 张金利 《河南建材》 2012年第2期180-182,共3页
通过洛阳市某楼建筑幕墙工程的设计和施工实例,详细的介绍了利用分度值为1 mm,90°不锈钢拐尺,做为平面直角坐标尺,并在构造节点空当处标记相关信息,用数码相机照片补充建筑幕墙细部构造(节点)隐蔽工程验收记录附件的方法,为工程留... 通过洛阳市某楼建筑幕墙工程的设计和施工实例,详细的介绍了利用分度值为1 mm,90°不锈钢拐尺,做为平面直角坐标尺,并在构造节点空当处标记相关信息,用数码相机照片补充建筑幕墙细部构造(节点)隐蔽工程验收记录附件的方法,为工程留下了真实、精确、直观可重献,并可直接读出构造(节点)部分细部精确尺寸的隐蔽工程验收记录附件。 展开更多
关键词 建筑幕墙 隐蔽工程验收记录 平面直角坐标尺 相关信息 构造(节点) 真实 准确 直观 可重献
下载PDF
Secure Data Aggregation Approach Based on Monitoring in Wireless Sensor Networks 被引量:1
2
作者 Dong Xiaomei Li Shanshan 《China Communications》 SCIE CSCD 2012年第6期14-27,共14页
In order to avoid internal attacks during data aggregation in wireless sensor networks, a grid-based network architecture fit for monitoring is designed and the algorithms for network division, initialization and grid... In order to avoid internal attacks during data aggregation in wireless sensor networks, a grid-based network architecture fit for monitoring is designed and the algorithms for network division, initialization and grid tree construction are presented. The characteristics of on-off attacks are first studied and monitoring mechanisms are then designed for sensor nodes. A Fast Detection and Slow Recovery (FDSR) algorithm is proposed to prevent on-off attacks by observing the behaviors of the nodes and computing reputations. A recovery mechanism is designed to isolate malicious nodes by identifying the new roles of nodes and updating the grid tree. In the experiments, some situations of on-off attacks are simulated and the results are compared with other approaches. The experimental results indicate that our approach can detect malicious nodes effectively and guarantee secure data aggregation with acceptable energy consumption. 展开更多
关键词 data aggregation wireless sensor net-work MONITORING on-off attack RECOVERY
下载PDF
Three dimensional efficient meshfree simulation of large deformation failure evolution in soil medium 被引量:4
3
作者 WANG DongDong LI ZhuoYa +1 位作者 LI Ling WU YouCai 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第3期573-580,共8页
An efficient Galerkin meshfree formulation for three dimensional simulation of large deformation failure evolution in soils is presented. This formulation utilizes the stabilized conforming nodal integration, where fo... An efficient Galerkin meshfree formulation for three dimensional simulation of large deformation failure evolution in soils is presented. This formulation utilizes the stabilized conforming nodal integration, where for the purpose of stability and efficiency a Lagrangian smoothing strain at nodal point is constructed and thereafter the internal energy is evaluated nodally. This formulation ensures the linear exactness, efficiency and spatial stability in a unified manner and it makes the conventional Galerkin meshfree method affordable for three dimensional simulation. The three dimensional implementation of stabilized conforming nodal integration is discussed in details. To model the failure evolution in soil medium a coupled elasto-plastic damage model is used and an objective stress integration algorithm in combination of elasto-damage predictor and plastic corrector method is employed for stress update. Two typical numerical examples are shown to demonstrate the effectiveness of the present method for modeling large deformation soil failure. 展开更多
关键词 meshfree method three dimensions stabilized conforming nodal integration failure evolution large deformation
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部