This paper deals with two kinds of birth and death processes with state 0 as their reflecting and quasi-leap-reflecting barriers.

文章研究以0为反射壁和以0为拟飞射壁的两种生灭过程。

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To a specific class of Brown birth and death processes, this paper gives the direct computational formula for one-dimensional distribution.

对于一类特殊的布朗生灭过程，本文给出了一维分布的具体计算公式。

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The paper briefly introduces several heat source models in numerical simulation of welding processes, including Gaussian distribution, double-ellipsoid distribution and birth-death element.

文中简要介绍了焊接过程数值模拟热源的各种加载模式：高斯分布函数、双椭球分布函数、生死单元方法。

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