非图解法求固结系数

本文利用三点法求固结系数Cv,并利用三点法中的表达式导出了固结度与量表读数,与试验经过时间的关系.同时以三点法为基础结合大沙基一维固结理论导出了求解固结系数Cv的又一表达式,使计算步骤大大简化.并用Pc-1500机结合Casio—3600P或Casio—180P计算器设计出了相应的计算程序,使三点法和三点法结合太沙基法的计算变得简单而快捷.     

CCl_4致肝脏损害的研究

采用四氯化碳（CCl4）对大鼠染毒模型，分别用不同浓度的CCl4，不同的染毒时间致大鼠急性染毒和慢性染毒，以血清甘腿酸（sGG）含量和血清谷丙转氨酶活性（sGPT）测定做为肝脏早期损害指标，用肝脏病理学检查观察肝组织损害程度。实验结果表明，急慢性染毒组sCG含量均明显高于对照组（P＜0．001），增高幅度急性组为2．79倍，慢性染毒组为3．9倍，另外，急性染毒组sCG含量及sGPT活性均明显低于慢性染毒组（P＜0．05），实验证明，CCl4浓度致使大鼠肝脏的损坏程度不如染毒时间长短密切。另经病理学检查证实、肝脏组织的破坏程度与染毒剂量不明显，与染毒时间有密切关系。     

The electrical conductivity of H_2O at 0.21-4.18 GPa and 20 -350℃

The electrical conductivity of H2O in solid and liquid phases has been measured at 0.21-4.18 GPa and 20-350℃. The results indicate: ( i ) different phases of H2O in solid have different relations between electrical conductivity and temperature and pressure. The conductivity changes continuously with temperature, but discontinuously with the pressure between 2.11 and 2.58 GPa, which corresponds to the transforming pressure between ice (Ⅵ) and ice ( Ⅶ ) ; ( ii ) the con-ductivity of H2O in liquid all increases with temperature and pressure, but there are discontinuities at pressures between 0.57 and 0.9 GPa, and between 2.11 and 2.58 GPa, which are also consistent with the polymorph of ice (ice ( Ⅴ), ice (Ⅵ) and ice ( Ⅶ ) ) . This reflects that H2O in liquid at different pressures has quite different properties of electron chemistry. It is prob-ably the important reason that causes the layers with high electrical conductivity and low velocity in the earth's crust and upper mantle.