7-氧代阿朴菲型生物碱的NMR研究

从鹅掌楸中分离得到了3个7-氧代阿朴菲型生物碱liridine (1),lysicamine (2)和liriodenine (3),采用MS、1D NMR和2D NMR等技术确定了化合物的结构,并利用2D NMR 技术对其核磁共振信号进行了全归属,纠正了文献中的归属错误.     

丝状液晶5CB与铁(Ⅲ)卟啉之间的轴向配位作用

通过考察掺杂配位性质不同的两种铁(Ⅲ)卟啉的丝状液晶5CB在磁场下的行为以及UV-Vis光谱,研究了液晶5CB与铁(Ⅲ)卟啉的轴向配位作用.结果表明,弗雷德里克兹转变阈值的降低和Soret带随着液晶5CB含量增大而红移是液晶5CB与五配位Fe(TPCl发生轴向配位的结果.     

对电子中微子质量为虚数的质疑

对原子能研究院的实验数据,用不同理论公式拟合后,指出负值的mv2有极大可能是因为理论公式不当而引起的.     

Photodetachment of negative ion in a gradient electric field near a metal surface

Based on closed-orbit theory, the photodetachment of H in a gradient electric field near a metal surface is studied. It is demonstrated that the gradient electric field has a significant influence on the photodetachment of negative ions near a metal surface. With the increase of the gradient of the electric field, the oscillation in the photodetachment cross section becomes strengthened. Besides, in contrast to the photodetachment of H near a metal surface in a uniform electric field, the oscillating amplitude and the oscillating region in the cross section of a gradient electric field also become enlarged. Therefore, we can use the gradient electric field to control the photodetachment of negative ions near a metal surface. We hope that our results will be useful for understanding the photodetachment of negative ions in the vicinity of surfaces, cavities, and ion traps.     

基于电动可调焦透镜的大范围快速光片显微成像

搭建了一种基于电动可调焦透镜(electrically tunable lens)的大范围快速光片荧光显微成像系统.通过引入电动可调焦透镜与一维振镜以实现成像物平面和光片位置的快速移动,再结合高速s CMOS完成快速光片荧光显微成像.另外实验中通过改善光路与提升动态成像质量,实现了大范围扫描并减少了伪像.最终对成像性能进行测试,本系统的纵向分辨率和横向分辨率分别达到约5.5μm和约0.7μm,单幅图像稳定成像的速度约为275 frames/s,成像深度可超过138μm,能满足对具有一定尺寸的生物样本进行实时清晰成像的需求.     

对电子中微子质量为虚数的质疑

对原子能研究院的实验数据，用不同理论公式拟合后，指出负值的ｍｖ２有极大可能是因为理论公式不当而引起的．