Femtosecond control of photoionization and photodissociation of sodium iodine molecules by laser pulse

Wave packet propagation techniques are used to find experimentally reliable laser parameters that yield optimal production.The photoionization and photodissociation dynamics of sodium iodine molecules are interpreted into several channels.Several frequencies are found to be suitable for NaI molecules during the photoionization and dissociation processes.Photon-dressed excited states and electron-dressed ionic continuum states facilitate the search for available laser parameters.     

布氏折射装置的设计

本文介绍了一种利用布儒斯特原理设计的折射装置，该装置具有原理简单、操作方便、对待测物要求低的特点。     

Si6X(X=Cu,Ag,和Au)团簇多激子产生的从头算研究

利用对称性组态相互作用理论（SAC-CI）和LANL2DZ基组研究Si₆X（X=Cu、Ag和Au）团簇的多激子产生（MEG）.在团簇的MEG计算之前,基于密度泛函理论和全电子基组DZP-DKH,对团簇的几何结构进行优化并且经过频率分析确认团簇的能量稳定性.结果表明：多激子的主导成分是双激子,这些团簇的MEG都出现在可见光范围内,团簇的MEG强的部分在紫外线范围内,为利用MEG制备光俘获材料提供信息.     

二维翼型亚临界定常流动的有限元计算

本文使用了曲四边形Ｈｅｒｍｉｔｅ等参元，通过变分有限元法，计算了二维翼型亚临界定常位势流动中的压力分布，数值计算结果与试验结果符合较好。文中还使用了有限元法中的局部线性化理论，插值出元素中心点密度去处理迭代过程中元素系数阵的计算，其结果与通常的有限元法计算相一致，但计算时间却大大减少了。     

Direct-writing organic three-dimensional nanofibrous structure

Direct-writing technology based on Near-Field Electrospinning (NFES) was used to fabricate an organic three-dimensional nanofibrous circle on the patterned silicon substrate. In NFES, straight jet without splitting and chaotic motion was utilized to direct-write orderly nanofiber. When the collector movement speed was lower than electrospinning rate, the relaxed nanofiber would be lead into the pendulum motion by the electrical field force and Coulomb repulsion force from the residual charges on the collector. When the relative air humidity is lower than 35%, individual nanofiber with larger elastic resistance would reveal a good self-assembly performance. Owing to the guidance of the electric field force at the edge of the micro-pattern, a nanofiber was deposited layer by layer to format a 3D nanofibrous circle on the top surface of the micro-pattern. The dimension scale of 3D nanofibrous circle was smaller than 30 μm. With the help of a microscope, a 3D nanofibrous circle can be deposited precisely on the strip micro-pattern with width of 4 μm. Furthermore, a 3D nanofibrous circle in different shapes can be obtained by using special micro-patterns. This organic three-dimensional nanofibrous circle has created a new aspect for the fabrication of organic micro/nanosystems.     

Surfaced-modified TiO2 Nanofibers with Enhanced Photodegradation Under Visible Light

Asynchronized surface modification method based on coaxial electrospinning was developed to fabricate high-efficiency photodegradative nanofiber for water purification. TiO₂ nanoparticles assembled uniformly on the surface of polycaprolactone(PCL) nanofibers to form composite nanofibers through one step process. The maximal content of Ti element was 25.6%(mass fraction) in the PCL/TiO₂ composite nanofibrous membrane, which exhibited hydrophilicity and excellent photodegradation under visible light in water. The Rhodamine B dye degraded 96.17% in 120 min under visible light by the PCL/TiO₂ composite membrane. The adsorption behavior fitted Langmuir model well and indicated chemical related adsorption. This PCL/TiO₂ composite nanofibrous membrane has super degradation properties and displays great application potential to environmental protection.