| NFIXED多指数程序中变量设定值对拟合结果的影响 |
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| 引用本文： | 唐超群. NFIXED多指数程序中变量设定值对拟合结果的影响[J]. 华中科技大学学报(自然科学版), 1989, 0(5) |
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| 作者姓名： | 唐超群 |
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| 作者单位： | 华中理工大学物理系 |
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| 摘 要： | 本文研究了用NFIXED多指数程序拟合正电子寿命谱时,零时间、拟合起始道与结束道、计算面积的起始道与始束道、寿命初值与强度初值等拟合参量以及误差、收敛快慢等控制变量设定值对拟合结果的影响,导出了各变量设定值正确选取的方法.
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| 关 键 词： | 正电子寿命谱 NFIXED多指数程序 拟合参量 控制变量 设定值 |
The Influence of Given Values of Variables on the Fitted Result in Multi-Exponent Program NFIXED |
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| Tang chaoqun. The Influence of Given Values of Variables on the Fitted Result in Multi-Exponent Program NFIXED[J]. JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE, 1989, 0(5) |
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| Authors: | Tang chaoqun |
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| Affiliation: | Tang chaoqun |
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| Abstract: | With detailed computer fitting experiments carried out on the positron lifetime spectrum, the influence of given values of the fitted parameters such as the zero time, fitting start and end channels, start and end channels in the calculation of the area, initial values of the lifetimes and intensities and the control variables such as the relative mean square deviation, deviation, convergence rate in iteration on the fitted results is studied in the fitting of the positron lifetime spectrum by the multi-exponent program NFIXED. Correct methods for choosing given values of variables and the best given values of some variables are derived. |
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| Keywords: | Positron lifetime spectrum Multi-exponent program NFIXED Fitted parameter Control variable Given value |
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