Reissner板问题的有限元广义混合法

用一般弹性体的广义混合变分原理,导出了适合Ｒｅｉｓｓｎｅｒ板弯曲问题的广义混合变分原理及其有限元广义混合法。算例说明,该有限元模式的刚度可以改变,比常规位移法的精度高,同时还能克服常规Ｒｅｉｓｓｎｅｒ板位移元用于计算薄板时所出现的“剪切自锁”现象,计算结果稳定,最后分析该法能够克服“剪切自锁”现象的原因。     

任意马赫数非定常流动数值模拟的统一算法

发展适用于从低速到高速任意马赫数非定常流动数值模拟的统一算法.通过引入一个伪时间导数项和一个新的预处理矩阵,得到双时间非定常预处理可压缩Navier-Stokes方程.方程的对流项采用三阶Roe通量近似差分格式离散,粘性项采用二阶中心差分格式离散.基于数值通量的线性化技术,实现伪时间步的隐式ADI-LU格式迭代,进而获得物理时间步的二阶推进精度.重点以低马赫数流动为例,求解了圆柱绕流和NACA0015翼型等速上仰动态失速问题.计算结果表明该统一算法能够较好地模拟低马赫数乃至任意马赫数非定常流动.     

Covalently stabilized vesicles derived from amphiphilic multiarm star polymers: Preparation,characterization, and their capability of hosting different polarity of guests

The large amount of terminal hydroxyl groups of amphiphilic multiarm star copolymers with hyperbranched polyethylenimine (PEI) as the hydrophilic core and poly(ε‐caprolactone) (PCL) arms as the hydrophobic shell were completely transformed into the radical‐crosslinkable methacrylate (MA) groups. The resulting PEI‐b‐PCL‐MA polymers could self‐assemble into vesicles in water, which was verified by dynamic light scattering (DLS) and transmission electron microscopy (TEM). After crosslinking the intravesicular MA groups, covalently stabilized vesicles (CSVs) were generated. These CSVs were further characterized by DLS and TEM, and it was found that the corona of the vesicles was not the simple double‐layer structure, but contained a certain amount of PEI‐b‐PCL unimolecular micellar units between the double‐layer. These CSVs could accommodate both apolar and polar guests using their hydrophobic PCL zones and void cores, respectively. Moreover, these CSVs showed superior capacities for apolar guests to their noncrosslinked precursors and the corresponding traditional amphiphilic multishell star polymers. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012     

带光放大器的分布式光纤拉曼温度系统

 详细阐述了红外双波长带光放大器的分布式光纤拉曼温度系统原理,为了抑制放大器的自发辐射增长、温漂噪声积累、瑞利背向散射光窜扰反斯托克斯背向散射光,采用两条已知温度的曲线和最近测量温度曲线的解调方法,提高了系统的测温精度和稳定性并降低了系统的成本。实验结果与理论分析一致,系统的测温误差在±0.1 ℃内。     

Facile Preparation of α‐Cyano‐α,ω‐Diaryloligovinylenes: A New Class of Color‐Tunable Solid Emitters

An efficient Knoevenagel condensation reaction was used to construct a series of α‐cyano‐α,ω‐diaryloligovinylenes, which show prominent fluorescence emission in the solid state. On investigating the effect of conjugation length on fluorescent properties, we found that the diene structure showed superior solid‐state luminescence. Furthermore, the emission color could be adjusted by introducing donor or acceptor functional groups at the terminal aryl groups. Full‐color emission in the visible region can be achieved by adding different functional groups to the α‐cyano‐α,ω‐diaryldivinylene moiety. The structure–property relationships were elucidated and some observations such as the substitution position effects were discussed. These compounds have potential applications as full‐color solid emissive candidates in material science and their simple structures allow them to be easily modified resulting in further interesting properties.     

Ti/ZrN2/Si薄膜界面扩散反应的研究

利用直流磁控反应溅射法在Si基底上制备了Ti/ZrN2/Si多层薄膜，利用俄歇深度剖析和线形分析研究了真空热处理前后膜层间的界面状态及相互作用.研究结果表明，Ti膜和ZrN2膜均在沉积过程中发生了界面扩散作用，真空热处理可以显著地增强Ti/ZrN2/Si膜层间的界面扩散和化学反应，并分别在界面层生成了TiNx和SiNx等物种.     

微乳液介质苯基荧光酮光度法测定微量钴

研究了微乳液介质中,在pH=10.0硼砂 氢氧化钠缓冲溶液时,钴与苯基荧光酮(PF)显色生成稳定的1∶2配合物,在637nm处摩尔吸光系数为1.21×105L/(mol·cm),钴含量在0～1.0μg/mL范围内符合比耳定律,用所拟方法以巯基葡聚糖凝胶分离富集,可测定维生素B12中的微量钴,结果令人满意.     

失笑散中15种微量元素的含量分析

应用电感耦合等离子发射光谱法(ICP-AES)测定失笑散的15种微量元素的含量。结果表明，这些元素与失笑散的药理作用有相关性。