Four New Schisanartane‐Type Nortriterpenoids from Schisandra propinqua var. propinqua

Four new, highly oxygenated nortriterpenoids with the unique schisanartane skeleton, propindilactones A–D ( 1 – 4 ), were isolated from the aerial parts of Schisandra propinqua var. propinqua, together with four known schisanartane‐type compounds. The structures of the new plant constituents were established on the basis of extensive spectroscopic methods.     

基于矢量衍射理论的相位型光瞳滤波器设计

根据矢量衍射理论,提出了一种设计纯相位型光瞳滤波器的新方法根据该方法所设计的滤波器主要应用于采用高数值孔径显微物镜的成像系统对点扩散函数中的指数因子进行二次近似处理后,可以得到超分辨参量与滤波器参量的近似关系式以三区相位型滤波器为例,讨论了该近似关系式的有效性给出一个设计实例,根据所要求的超分辨性能要求设计滤波器.模拟结果表明,该滤波器达到了设计要求,最后利用共焦系统点扩散函数的乘积特性,大大减弱了旁瓣的影响.     

Fatty acids. VII. The gas-liquid chromatographic properties of all dimethylene interrupted methyl cis,cis-octadecadienoates.

The gas-liquid chromatographic behaviour of all the dimethylene interrupted methyl cis,cis-octadecadienoates was studied on polar (Carbowax 20M, FFAP, DEGA, DEGS and Silar 10C), semi-polar (XE-60) and non-polar (SE-30, OV-101 and Apiezon L) stationary phases. The equivalent chain length of each isomer is recorded; the possibility of separation and the retention pattern of these isomers are discussed.     

Optical birefringence in cubic ZnSe crystals

Optical birefringence of the spatial dispersion type has been observed in cubic ZnSe crystals.     

一类离散的非线性爆炸方程平衡点的稳定性

本所研究的非线性爆炸方程实质上是由可数无穷多个彼此相互关联的非线性常微分方程所组成的自治系统，它刻划了在只有基本粒子与i-粒子(i≥1)进行碰撞反应的系统里，粒子增长过程中密度随时间变化规律。本证明了如果系数满足一定的假设，那么在爆炸占优的条件下，这一系列的平衡点在Lyapunov意义下是稳定的．