摘要：Cam profiles play an important part in the performance of cam mechanisms. Syntheses of cam profile designs and dynamics of cam designs are studied at first. Then, a cam profile design optimization model based on the six order classical spline and single DOF(degree of freedom) dynamic model of single-dwell cam mechanisms is developed. And dynamic constraints such as jumps and vibrations of followers are considered. This optimization model, with many advantages such as universalities of applications, conveniences to operations and good performances in improving kinematic and dynamic properties of cam mechanisms, is good except for the discontinuity of jerks at the end knots of cam profiles which will cause vibrations of cam systems. However, the optimization is improved by combining the six order classical spline with general polynomial spline which is the so-called "trade-offs". Finally, improved optimization is proven to have a better performance in designing cam profiles.

摘要：1.工程概况张河湾电站位于井陉县测鱼镇,取水泵站取水口位于电站的交通洞口与排风洞之间、8#公路的外侧,采用移动式泵车取水.移动式泵车轨道沟宽8m,顶部高程490m,底部高程443m,坡比1:2;轨道沟东侧铺设输水管道,每隔3m高差焊接一叉管,抽水时与水泵出水管相连,顶部490m平台设8t卷扬机1台,运行时随水位升降,卷扬机拉动泵车上下移动以适应不同的水位.输水管道安装终点高程450m,轨道铺设终点高程445m,开挖终点高程443m.

摘要：目的:建立小儿清肺定喘口服液制备与质量控制的方法。方法:设计处方和制备工艺,应用薄层层析法对处方成分进行定性鉴别。结果:本制剂工艺稳定,TLC得到有效分离,专属性强,重现性好。结论:该制剂提取工艺合理,分析方法可靠,快捷,制剂性质稳定,具有较好的临床应用价值。