滑坡碎屑流作用下埋地管道轴向应变特性

为了保证滑坡碎屑流灾害作用下管道的稳定运作,根据热-弹塑性理论,创建了滑坡碎屑纵向作用条件下埋地管道的应变分析模型,对不同滑坡碎屑流长度、宽度和厚度条件下埋地管道轴向应变分布特征进行研究.结果表明,滑坡碎屑流尺寸对管道轴向拉压应变的影响程度,从大到小依次为滑坡厚度、长度、宽度.通过分析径厚比、管壁减薄和管道埋深等结构参数对轴向拉伸应变的影响规律,发现管道轴向最大拉压应变随着坡度、埋土深度增加而明显减小;管道的壁厚减薄与管道轴向拉压应变呈正相关,管道埋深与之呈负相关;从管道结构参数对管道最大轴向拉压应变影响的影响程度来看,依次为管道埋深、管壁减薄、径厚比.适当增加滑坡碎屑流作用条件下的管道埋深可以减小滑坡碎屑流灾害作用风险.

582例散光轴向分布的研究

为探讨散光眼散光轴向分布的规律，本文对５８２例（１０１８眼）散光眼进行了分析。通过验光检查确定散光轴向，并按年龄大小分成七个年龄组，就近视性散光、远视性散光和混合性散光之轴向分别加以分析。结果：散光轴向的总体分布以垂直经线和水平经线为多。无论何种散光类型，４０岁以下各年龄组散光眼的散光轴向大多呈顺规性散光分布。随着年龄的增长，逆规性散光的比例增高，４０岁以上年龄组散光眼的散光轴向大多呈逆规性散光分布。各年龄组之间散光轴向差异极显著。双眼散光轴向大多呈对称性或同轴性分布。结论：散光轴向可随年龄增长而改变，并呈逆规性散光状态的变化。

Experimental Research of Pressure Distribution in the Casing of Inducer

In this paper the inducer of the advanced-researched pump is studied. During multi-rotation speed experimentwith the medium of water, the dynamic pressures near inducer casing are obtained by transducer at each measuringpoint mounted on the casing along the axial direction, both in the steady rotation speed period and the up anddown period. Bases on analyses, the regularity of the axial distribution of time averaged pressure and pressurepulsation amplitude, the connection between pressure pulsation frequency and rotation speeds, and the relationshipbetween the pressure pulsation amplitude and the site of inducer blade are obtained.