月球的低重力环境对月面浅层月壤力学特性的影响很大。利用清华大学取自吉林省靖宇县境内的火山灰岩研制出的模拟月壤（QH-E）,对GCTS公司生产的STX型动/应力路径三轴仪重新配置高精度的传感器,并采取专门的试验技术,成功实施了一系列...月球的低重力环境对月面浅层月壤力学特性的影响很大。利用清华大学取自吉林省靖宇县境内的火山灰岩研制出的模拟月壤（QH-E）,对GCTS公司生产的STX型动/应力路径三轴仪重新配置高精度的传感器,并采取专门的试验技术,成功实施了一系列低围压水平（3.13~25 k Pa）的三轴压缩试验。试验结果表明,在低围压水平下：模拟月壤具有显著的剪胀效应;与常规围压水平（50~150 k Pa）结果相比,同一相对密度模拟月壤的峰值摩擦角更高;相对密度越高,峰值摩擦角越大;切线模量和剪切模量均随着围压和相对密度的减小而减小;剪胀角随围压的减小和相对密度的增大而增大,且低围压水平下剪胀角对围压变化十分敏感。最后就低围压下QH-E模拟月壤与饱和砂土特性的差异,及重力场环境和施加围压的介质的影响进行了讨论。展开更多
The electronic structures of QHS and DQHS were completely optimized and calculated by B3LYP density functional theory at the 6-31g* level. The relationship between electronic structure parameters and antimalarial acti...The electronic structures of QHS and DQHS were completely optimized and calculated by B3LYP density functional theory at the 6-31g* level. The relationship between electronic structure parameters and antimalarial activity was discussed. There exists significant difference in frontier orbitals of QHS and DQHS. Their net charges and bond orders were also compared respectively. The results of calculation prove theoretically that the endoperoxy bridge is the essential of antimalarial activity. The difference of antimalarial activity between QHS and DQHS was reasonably explained based on their electronic structures.展开更多
文摘月球的低重力环境对月面浅层月壤力学特性的影响很大。利用清华大学取自吉林省靖宇县境内的火山灰岩研制出的模拟月壤（QH-E）,对GCTS公司生产的STX型动/应力路径三轴仪重新配置高精度的传感器,并采取专门的试验技术,成功实施了一系列低围压水平（3.13~25 k Pa）的三轴压缩试验。试验结果表明,在低围压水平下：模拟月壤具有显著的剪胀效应;与常规围压水平（50~150 k Pa）结果相比,同一相对密度模拟月壤的峰值摩擦角更高;相对密度越高,峰值摩擦角越大;切线模量和剪切模量均随着围压和相对密度的减小而减小;剪胀角随围压的减小和相对密度的增大而增大,且低围压水平下剪胀角对围压变化十分敏感。最后就低围压下QH-E模拟月壤与饱和砂土特性的差异,及重力场环境和施加围压的介质的影响进行了讨论。
文摘The electronic structures of QHS and DQHS were completely optimized and calculated by B3LYP density functional theory at the 6-31g* level. The relationship between electronic structure parameters and antimalarial activity was discussed. There exists significant difference in frontier orbitals of QHS and DQHS. Their net charges and bond orders were also compared respectively. The results of calculation prove theoretically that the endoperoxy bridge is the essential of antimalarial activity. The difference of antimalarial activity between QHS and DQHS was reasonably explained based on their electronic structures.
