关于血浆中放射性钙C_a^(47)浓度的计算公式

本文以随机微分方程理论为工具,建立了二房室随机模型,给出了每个房室中药物含量的随机表达式。并且用C_α^(47)在血浆中的实验数据对上述随机表达式中的参数进行了参数估计,从而得到了C_α^(47)在血浆中的计算公式,通过实际模拟,在残差量小的意义下,我们的计算公式更符合C_α^(47)在血浆中的变化规律。

Effects of Temperature on the Deposition Rate of Supersaturated Silicic Acid on Ca-type Bentonite Tsuyoshi Sasagawa, Taiji Chida and Yuichi Niibori

Na-type bentonite is commonly used as a tunnel backfilling material to prevent groundwater and radionuclide migration during the construction of a geological disposal system for high-level radioactive waste in Japan. However, host rock fractures with strong water flow can develop groundwater paths in the backfilling material. Especially, the alteration to Ca-type bentonite causes degradation of the barrier performance and accelerates the development of groundwater paths. Additionally, using cementitious materials gradually changes pH between 13 and 8. High alkaline groundwater results in high solubility of silicic acid; therefore, silicic acid is eluted from the host rock. Downstream, in the low alkaline area, the groundwater becomes supersaturated in silicic acid. This acid is deposited on Ca-type bentonite, thus leading to the clogging of the groundwater paths. In the present study, we investigate the silicic acid deposition rate on Ca-type bentonite under 288-323 K for depths greater or equal to 500 m. The results indicate that temperature does not affect the silicic acid deposition rate up to 323 K. However, in this temperature range, the deposition of silicic acid on Ca-type bentonite in backfilled tunnels results in clogging of the flow paths.

关于体内药物含量的计算公式及应用

以非齐次Ｍａｒｋｏｖ过程理论为基础，建立了ｎ房室药物随机模型，给出了体内房室中药物含量的随机表达式及其数字特征．用实验数据对表达式中的参数进行了非参数估计。

琥珀酰缩胆囊素七肽对小鼠海马突触体摄取^(45)Ca的影响(英文)

目的;探讨琥珀酰缩胆囊素七肽(SCH)对小鼠海马突触体摄取^(45)Ca的影响,并与辛卡利特作.了比较.方法:蛋白质浓度的测定用染料法.^(45)Ca的摄取测定采用^(45)CaCl_2加入突触体悬液中孵育后用玻璃微纤维过滤器过滤,用液闪光谱仪计数.结果:SCH是辛卡利特异构物.实验表明在0.125—2 μmol·L^(-1)的剂量范围内SCH呈剂量依赖性地抑制小鼠海马突触体摄取^(45)Ca.其抑制的程度与辛卡利特近似.SCH与辛卡利特的这种抑制效应能被丙谷胺、β-内啡肽所拮抗.结论:辛卡利特N端天冬氨酸残基的改变对海马突触体摄取^(45)Ca无明显影响.