Chiral Ferrocenyl Amino Alcohols：Preparation and Application as Catalysts in the Enantioselective Reduction of Ketones Using NaBH4／I2

Five novel chiral ferrocenyl amino alcohols were prepared from natural amino acids and used as catalysts in the asymmetric reduction of prochiral ketones with NaBH4/I2 combination.The incorporation of the ferrocenyl moiety into the molecule of the chiral amino alcohols greatly improved their enantioselectivity in the catalysis.The optically active secondary alcohols were obt5ained in moderate to good enantiomeric excesses and high chemical yields.     

零售与回收双竞争环境下闭环供应链线性转移支付契约研究

利用博弈理论研究了由单个制造商与n个零售商组成的零售与回收均存在竞争的闭环供应链的协调问题,给出了分散决策与集中决策情形下系统成员的最优决策和收益,发现分散决策使闭环供应链系统收益受损;提出了一种线性转移支付契约,实现了闭环供应链的协调.最后,通过一个数值算例验证了研究结论.     

蓝光二极管发光材料4,4’-双(2,2-二(4-氟苯基)乙烯基)联苯的合成及发光性能

合成了一种新的蓝光材料4,4^'-双(2,2-二(4-氟苯基)乙烯基)联苯(DFPVBi)，用IR、¹H-NMR、¹³C-NMR、¹⁹F-NMR及质谱确定了分子结构。采用紫外可见吸收光谱、循环伏安和荧光光谱研究了电子及荧光性能。HOMO及LUNO能分别为-5.77ev和-2.75eV。用DFPVBi制作的有机电致蓝光器件其光谱峰值波长为454nm,14.2V电压时达到最大亮度5872cd/m²,在10V时具有最大发光效率2.82cd/A。     

Field-Free Orientation of Molecules with Small Permanent Dipole Moments by Using a Train of Half-Cycle Pulses

We present a scheme aiming at the field-free orientation of molecules with smaller permanent dipole moments under the framework of the half-cycle pulse (HCP) method. Taking the HCCCI molecule as an example, we show that a train of identical HCPs with special time intervals can considerably raise the level of the orientation. The scheme is analytically interpreted in terms of intermittent Rabi oscillations by referring to a simplified two-state model.     

烷基二环氧甘油醚交联剂制备β—环糊精聚合物及其应用的研究

以1，6己烷基二环氧甘油醚为交联剂，与β-环糊精（β-CD）反应，合成一种具有三维网状结构大分子聚合物，应用β-CD包络空腔与肌醇分子尺寸匹配的特性，以这种聚合物作为分离介质，采用柱层析的方法制备肌醇，得到高纯度肌醇样品，并对β-CD交联聚合物的结构进行了表征，讨论了分离条件和聚合物的性质对肌醇纯度的影响规律，找出了优化条件，与其他方法比较，该方法具有回收率较高，便捷、高效的特点。     

反向流动注射阻抑动力学光度法测定微量锑（Ⅲ）

锑是一种广泛分布的有毒元素,许多研究证明锑对人体及生物具有毒性及致癌性,由于锑矿的开采和加工以及自然过程的影响,环境水样中锑污染日趋严重,而人体及生物对锑的摄取,一般来自饮用水、空气等,因此有效、快速、灵敏的测定环境水样中的锑具有实际的意义.     

Photoluminescence Mechanism of ZnO：Zn Investigated by Microwave Dielectric Spectrometry

We investigate the decay process of photoelectrons from a luminescent material of ZnO:Zn using a microwave dielectric spectrometry. Electrons in the conduction band are found to decay exponentially and the lifetime is 781 ns, while the time interval of decay from the maximum to half of this value is 470ns. ZnO:Zn is a green luminescent material at its central wavelength of 510 nm. Compared to the decay of electrons in the conduction band, the decay process of the luminescence is faster, and the time interval of decay from the maximum to half of the maximum is about 100 ns. We believe that the mechanism of the ZnO:Zn visible luminescence is recombination luminescence, and find that our theoretical simulation is in agreement with the experimental results.     

轴向交变载荷作用下螺栓联接结构的松动试验研究

在设计、试制螺栓加载装置的基础上,对螺栓联接结构进行了轴向振动的疲劳试验,获取了螺栓夹紧力的时变曲线,并对试验后的螺栓接触表面进行损伤分析,研究螺栓联接结构的松动机理.结果表明:在轴向振动条件下,螺栓联接结构的夹紧力下降较为明显,但拧出力矩相对于预紧力矩变化不大.螺栓的松动过程可分为以下两个阶段:试验初期由于螺栓接触面的塑性变形,夹紧力迅速下降;然后由于接触面之间的微动磨损,夹紧力缓慢下降.螺纹接触面之间的损伤机制主要为黏着磨损、磨粒磨损和剥层.     

斜拉索非线性振动跳跃过程试验研究

斜拉索振动中的“跳跃”现象是一种典型的非线性行为。虽然,在以往的理论和实验研究中已发现该现象,但是,却没有直接观测到其发生的过程。为探究斜拉索“跳跃”过程及该过程中的非线性动力行为,根据动力相似理论的弹性力-重力相似律设计了斜拉索实验模型。通过在扫频试验中使激励频率恰好等于“跳跃”的临界频率,直接观测到了斜拉索自发发生的“跳跃”过程。对空间运动形态变化规律和特征的研究发现：斜拉索“跳跃”过程空间运动不仅仅是振幅突然改变,而是经历了面内外振幅急剧减小、面内外振动交替占主导及“气圈”运动逆顺时针交替变换3个阶段。