Ultrafast all-optical switching in a silicon-polymer compound slotted photonic crystal nanobeam cavity

Optical Review - On-chip ultrafast all-optical switching is highly desirable and important for all-optical information processing and photonic integrated circuits (PIC). Although numerous...     

Dynamics of Bose-Einstein condensates in a one-dimensional optical lattice with double-well potential

We study dynamical behaviors of the weakly interacting Bose-Einstein condensate in the one-dimensional optical lattice with an overall double-well potential by solving the time-dependent Gross-Pitaevskii equation. It is observed that the double-well potential dominates the dynamics of such a system even if the lattice depth is several times larger than the height of the double-well potential. This result suggests that the condensate flows without resistance in the periodic lattice just like the case of a single particle moving in periodic potentials. Nevertheless, the effective mass of atoms is increased, which can be experimentally verified since it is connected to the Josephson oscillation frequency. Moreover, the periodic lattice enhances the nonlinearity of the double-well condensate, making the condensate more “self-trapped” in the π-mode self-trapping regime.     

中草药透骨草中4种微量元素的形态分析

按照传统煎煮法对中草药透骨草中铜、锌、铁、镁4种元素进行提取;用微孔滤膜分离提取液中的可溶态与悬浮态;利用大孔吸附树脂柱对可溶态中的有机态与无机态进行分离;采用火焰原子吸收光谱法对各种形态中的4种元素进行测定。结果显示,透骨草中4种元素的总提取率在44.03%—63.15%之间,浸留比在79.46%—188.80%之间,悬浮态颗粒吸附率在10%左右。