Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
祐延 悟*; 正木 健太郎*; 大釜 一真*; 荻原 徳男
Journal of the Vacuum Society of Japan, 56(4), p.142 - 145, 2013/04
Monte-Carlo method is useful for the transmission probability calculation of a complicated shaped tube under molecular flow conditions. However the shape data should be fed into the computer for each simulation. In the present study, transmission probability was calculated by KPCalc, which is the Monte-Carlo simulation software. KPCalc can calculate the transmission probability from the 3D-CAD data without preparing the source code of the shape data. Therefore, KPCalc is easily applied even for the complicated shape which the conventional Monte-Carlo method was hardly applied because of much labor. Calculation was carried out for cylindrical tubes, conical tubes, and bellows-shaped tubes. Results are in good agreement with previous results within the data scattering. As an example, transmission probabilities of formed bellows tubes with a complicated shape were calculated.
Eu M
ssbauer spectroscopic study on the Eu
M
O
(0
y1.0)(M=Th, U)正木 信行; 音部 治幹; 中村 彰夫; 原田 大実*; 伊藤 健太郎*; 佐々木 吉慶*; 日夏 幸雄*
Journal of Nuclear Science and Technology, 39(Suppl.3), p.217 - 220, 2002/11
EuMO(0y1.0)(M=Th, U)系について、Euメスバウア分光法を用いて局所構造を調べた。粉末X線回折によると、M=Th系では、y
0.5で酸素空格子点(V
)が無秩序配置をとる欠陥蛍石型相を、0.5y0.8でVが秩序化したC型相と欠陥蛍石型相を、y
0.85の領域でC型相と単斜晶のFu
O
相となることが示された。この系で、Eu
の異性体シフトは、Eu固溶率yに従って増加した。Euに対するO
の配位数(CN)はCN=8-2yに従って減少するので、Oイオン間の反発力の減少によって、平均Eu-O間距離も減少する。この相関は、酸化物系におけるEuの異性体シフトとEu-O結合距離の経験的相関に従っている。U系において相図はTh系と同様であったが、異性体シフトは変化せずTh系に比べて小さな値をとった。
