马水河大桥岸坡稳定性离散单元法分析

利用改进后的离散元计算程序，对宜（昌）－万（州）铁路马水河大桥万州岸岸坡在天然和加栽状态下．分别进行了变形破坏的离散元模拟，得出了在两种状态下边坡的稳定性。计算结果表明．岸坡在两种状态下整体均是稳定的。值得注意的是，在天然状态下后期会有一定的裂隙发育，并出现坡体整体下陷．在设计和施工时应予加固防护。     

参加车展需要点勇气

不排除有的车企是出于对这个“新能源车展”的某些担心才没有参展。无论怎样，节能和新能源是汽车产业发展的方向，借助一个优秀的平台和适宜的契机，让更多观众，包括直接的新能源汽车产品的消费者认识“新能源”是每一个获得国家财政支持的车氽应有的责任。     

高速列车通过隧道流场的三维数值模拟

应用三维粘性、非稳态不可压缩流的数学模型,对高速列车通过隧道时隧道内的压力变化、列车受到的气动阻力等问题进行分析研究,得到了隧道内的压力流场三维分布图,求出了速度、阻塞比等参数与压力、气动阻力之间的数值关系,为解决高速列车通过隧道引起的空气动力学问题提供参考。     

Dry sliding wear behavior of silver containing Ni-based composite-steel tribo-pair

Ni-based self lubricating composites containing four different amounts of silver were prepared by powder metallurgy (PM) route. The room temperature friction and wear behavior was investigated by carrying out dry sliding experiments against bearing steel using a ring-on-disk configuration. Tests were conducted at a constant load of 100N and different sliding speeds of 0.5, 1.0 and 1.5 m/s to analyze the effect of both the speed and the silver content on the wear behavior of the tribo-pair. The friction coefficient and the wear rate of the composites were found to decrease with increasing both the sliding speed and the silver content. The wear rate of the counterface was observed to be a little higher when it was siding against the composite having silver in comparison to that without any silver. However, the overall wear rate of the tribo-pair was found to decrease with increasing sliding speed and silver content.     

建筑抗震设计规范中场地类别划分的进展分析

分析了我国《建筑抗震设计规范》GBJ 11-89,GB 50011-2001和GB50011-2010在场地类别划分参数指标方面的进展与更新,讨论了它们在使用过程中可能存在的一些问题,并分别按其各自的场地类别的划分方法,计算了收集的176个实测剪切波速的钻孔资料,得出了其场地类别的分布情况。对比分析发现,2010规范与2001规范相比,场地类别划分的情况基本一致,即Ⅰ,Ⅱ类场地的范围无变化,Ⅲ,Ⅳ类场地的范围略有变化;与1989规范相比,变化较大,Ⅰ,Ⅱ类场地的范围约有10.0%的减小,Ⅲ类场地的范围有3