However, conventional methods of obtaining fetal tissues for genetic analysis, including amniocentesis and chorionic villus sampling, are invasive and constitute a finite risk to the unborn fetus.
然而，常规的获得遗传学分析的胎儿组织的方法是有创伤的并且是对胎儿有一定的风险，这些方法包括羊膜腔穿刺和绒毛活检被称为侵入性产前诊断。
At last we obtain the supremum estimation of the finite time ruin probability and the infinite time ruin probability in the third new risk model.
对第三类风险模型进行研究，得到了有限时间破产概率和终极时间破产概率的上界估计。
In this thesis, we mainly study the ruin probabilities in finite time and the ruin probabilities in infinite time in two generalized discrete time risk models.
本文主要研究了两类推广的离散时间风险模型的有限时间内破产的概率和最终破产概率。
The finite element method is applied to analysis and optimize the design of the hydrogenation reactor skirt support area, and stress of the risk section is assessed and strength is checked.
采用有限元法对加氢反应器裙座支撑区进行有限元分析及优化设计，并对其危险截面作应力评定和强度校核。
Some precise estimates were made of two kinds of ruin probabilities of finite time with heavy- tailed insurance risk and financial risk.
在保险风险和金融风险为重尾分布的条件下，得到了二维风险模型两种破产概率的精确估计以及另外一个破产概率的上下界。
This paper puts forward the engineering geological evaluation of seismic risk of Jiaozuo-Hebi mine areas by the analysis of seismic geological background and finite clement calculation.
本文通过对地震地质背景分析和数学有限元计算，最后提出对焦作-鹤壁矿区地震危险性工程地质评价。
This paper puts forward the engineering geological evaluation of seismic risk of Jiaozuo-Hebi mine areas by the analysis of seismic geological background and finite clement calculation.
本文通过对地震地质背景分析和数学有限元计算，最后提出对焦作-鹤壁矿区地震危险性工程地质评价。
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