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1. 安徽理工大学计算机科学与技术系
2. 安徽理工大学数理系
Published:01 October 2006
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[1]张莱,许峰,张竹林.用解析和数值方法研究动量淀积深度分布[J].核技术,2006(10):754-759.
ZHANG Lai1 XU Feng2 ZHANG Zhulin2 1. Research on momentum deposition depth distribution based on analytical and numerical methods[J]. Nuclear techniques, 2006, (10): 754-759.
基于解析和数值两种方法
作者研究了Glazov于1994年提出的计算由原子弹性碰撞引起动量淀积的空间分布。本文证明了Glazov推导出的积微分方程是不正确的
因为其中将两个原本独立的变量“纠缠”起来。分布函数在靶表面的“奇点”正是由这种“纠缠”引起的。动量淀积分布函数所满足的传统Boltzmann输运方程与Glazov方程并不等价。所以
由Glazov方程推导出的一切结果就都成问题了。另一方面
作者证明了由Glazov同样的高精度计算(通常n=300阶矩
28位小数)精度不足以再现Glazov文中的大部分图表。在这个工作中
作者用Padé逼近以及更高精度(n=980阶矩
500位小数)计算了动量淀积分布函数的富利叶变换f(k
η)和fL(k)。我们的数值计算结果表明:对于这类输运问题的研究
Padé逼近是一种强大的理论工具。
Based on both analytical and numerical methods
the authors have investigated a theory proposed by Glazov in 1994 for finding the depth distributions of momentum deposition by atomic particles in elastic collisions. It is shown that the integro-differential equations derived by Glazov are incorrect because of the “entanglement” of two original independent variables. The “singularity” of the distributions at the target surface originated from the “entanglement”. The traditional Boltzmann transport equation of the depth distributions of momentum deposition cannot be equivalent to the Glazov’s equation. Therefore
all of the results derived from the Glazov’s equation turned out to be questionable. On the other hand
the numerical calculations with high accuracy (usually the moments were found up to n=300 with 28-decimal-digits precision) published by Glazov at the same time were repeated in this work
and it was shown that the Glazov’s numerical results were not accurate enough to reproduce most of figs in his work. In this work
the Padé approximation has been used with higher accuracy (the moments found up to n=980 with 500-decimal-digits precision) to compute the Fourier transform of the momentum deposition depth distribution functions f(k
η) and fL(k). Our numerical results show that the Padé approximation is a powerful tool to research these depth distribution functions.
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