含芘手性探针分子与蛋白质作用机理的时间分辨荧光光谱研究

采用时间分辨荧光光谱等手段研究了手性探针分子L-[4-(1-芘基)]丁酰基苯丙氨酸(PLP)与溶菌酶(Lys)、牛血清白蛋白(BSA)和人血清白蛋白(HSA)的结合过程及机理,探讨了三氯六氨合钴(CoHA)对不同复合体系内芘基的荧光猝灭作用.结果表明,PLP在与血清白蛋白的结合过程中是以芘基插入到血清白蛋白疏水空腔中的方式与蛋白质结合的;而PLP与Lys的结合部位处在其表面的疏水部分.     

Phenomena of optic-bound effect on fibre optic gyro

The optic-bound effect on fibre optic gyro (FOG) precision is analysed theoretically, and formulas describing the change of FOG light power under the action of optic-bound effect are given. It is confirmed that optic-bound effect is a main instantaneous non-reciprocity effect of FOG in addition to the Sagnac effect and can lead to a dynamic error of FOG in practical environments. An approach to suppressing or eliminating the error due to the optic-bound effect is presented and verified experimentally. The result shows that the approach is valid and the precision of FOG is improved observably.     

连续凹槽基底对含非溶性活性剂薄液膜流动特性的影响

针对连续凹槽基底上含非溶性活性剂液膜的流动过程, 采用润滑理论建立了液膜厚度和活性剂浓度演化模型, 利用PDECOL程序数值模拟得到了液膜流动的动力学特征及基底结构参数的影响. 研究表明: 活性剂液膜流经连续凹槽时, 负向台阶处形成凹陷, 正向台阶处形成隆起, 且随时间逐渐增大; 与平整基底相比, 连续凹槽下的活性剂液膜铺展速度加快; 基底凹槽的高度增加或斜度减小可加速液膜破断的可能性; 增大凹槽宽度可促进液膜流动; 减小斜度会使液膜进入第一凹槽前形成隆起特征; 重力在液膜的爬坡和下坡过程中具有相反的作用, 但均使得流动稳定性变差; 分子间作用力形成的结合压可加速液膜流动, 进而引发去湿润现象, 分离压则与之相反. 关键词： 活性剂液膜 非平整基底 铺展 分子间作用力     

Photoinduced degradation of organic solar cells with different microstructures

An in situ measurement setup is established to investigate the photoinduced degradation effects in a controllable inert gas ambient environment for the two different microstructures of poly(3-hexylthiophene)(P3HT) and [6,6]-phenyl-C61-butyricacid methyl ester(PCBM) bulk-heterojunction organic solar cells. The two devices are fabricated with the solvent vapor drying process followed by a thermal annealing(vapor drying device) and only a normal thermal annealing process(control device), respectively. Their power conversion efficiencies(PCEs) and aging features are compared. Their different degradation behaviors in light absorption are confirmed. In addition, irradiation-induced changes in both nanostructure and surface morphology of the P3HT:PCBM blend films treated with two different fabrication processes are observed through scanning electron microscopy and atomic force microscopy. Aggregated bulbs are observed at the surfaces for control devices after light irradiation for 50 h, while the vapor drying devices exhibit smooth film surfaces, and the corresponding device features are not easy to degrade under the aging measurement. Thus the devices having solvent vapor drying and thermal annealing show better device stabilities than those having only the thermal annealing process.     

Synthesis,Structure and Catalytic Activity of a Manganese(Ⅲ) Complex Based on 2-(2-Hydroxyphenyl)-5,6-dichlorobenzimidazole Ligands

A new ligand, 2-(2-hydroxyphenyl)-5,6-dichlorobenzimidazole, H2pbmCl2(1), and a novel MnIII complex, [MnIII(HpbmCl2)(pbmCl2)(DMF)2](2),(DMF = N,N-dimethylformamide), have been synthesized and characterized. The crystal of compound 1(C13H8Cl2N2O, Mr = 279.12) belongs to the monoclinic system, space group P21 with a = 3.770(5), b = 25.20(3), c = 5.865(7) , = 92.727(17)o, V = 556.6(12) 3, Z = 2, Dc = 1.665 g/cm3, S = 1.137, μ= 0.568 mm-1, F(000) = 284, the final R = 0.0876 and wR = 0.2334 for 1848 independent reflections. The molecule is planar due to the presence of a strong intramolecular hydrogen bond between O–H group of phenol and N atom of imidazole. H2pbmCl2(1) molecules are arranged into a one-dimensional linear chain through intermolecular hydrogen bonds(N–H···O and C–H···Cl). The crystal of complex 2(C32H27Cl4MnN6O4, Mr = 756.34) belongs to the monoclinic system, space group P21/c with a = 19.043(10), b = 10.808(5), c = 18.704(11), = 115.540(6)o, V = 3473(3) 3, Z = 4, Dc = 1.446 g/cm3, S = 1.3, μ = 0.733 mm-1, F(000) = 1544, the final R = 0.1219 and wR = 0.2681 for 7811 independent reflections. The Mn ion adopts a distorted octahedral geometry coordinated by two deprotonated H2pbmCl2 ligands and two DMF molecules. The [MnIII(HpbmCl2)(pbmCl2)(DMF)2] molecules are arranged into a three-dimensional structure through hydrogen bonds(N–H···N, C–H···N and C–H···Cl) and weak π···πinteractions. The activity measurements suggest that complex 2 is able to serve as a catalyst for H2O2 disproportionation reaction to form O2 in neutral water solution.     

LiBa0.95-yBO3∶0.05Tb3+,yBi3+荧光粉的制备及荧光性质

以硼酸和碳酸盐为原料,用高温固相法制备了可被(近)紫外光(369、254 nm)有效激发的Tb³⁺单掺杂Li Ba1-xBO3∶xTb³⁺(物质的量分数x=0.02、0.03、0.04、0.05、0.06、0.07)及Bi³⁺和Tb³⁺共掺杂LiBa_0.95-yBO₃∶0.05Tb³⁺,y Bi³⁺(物质的量分数y=0.02、0.03、0.04、0.05、0.06、0.07)的2个系列荧光粉,产物的结构和形貌分别用粉末X射线衍射(PXRD)和扫描电子显微镜进行表征。PXRD测定结果表明2个系列的产物均为纯相LiBaBO3。通过对第一系列产物荧光光谱的测定,筛选出发光强度最好的产物,据此确定铽离子的最佳掺杂量;在此基础上制备出铋离子掺杂量不同的第二系列荧光粉。荧光光谱测定的实验结果表明,Tb³⁺/Bi³⁺共掺杂的荧光粉的发光强度好于Tb³⁺单掺杂的荧光粉,这说明Bi³⁺对Tb³⁺有敏化作用;而且随着Bi³⁺掺杂量的增加,产物的荧光强度表现出先增加后减小的趋势,当Bi³⁺的掺杂量y=0.03时,产物的荧光强度达到最大。Bi³⁺和Tb³⁺之间存在偶极-四极相互作用而进行能量传递。系列荧光粉的CIE坐标显示其发光颜色在一定程度上呈现出由绿色光到白光的渐变趋势。     

有leader的二阶动态多智能体网络的L2-L∞控制

考虑系统噪声和时滞,利用L2-L∞控制理论研究了有leader的二阶定拓扑多智能体系统的协调一致问题.工程应用中控制输出的极大值经常需控制在一定范围内,并且考虑系统对位置变量和速度变量限制的范围不同,分别针对位置和速度的控制输出设计了加权系数;进而建立了多智能体系统的数学模型.对有时滞和无时滞的两种网络拓扑,利用李亚普诺夫函数,分析了多智能体系统在满足L2-L∞性能指标要求下,followers和leader的位置与速度的一致问题.并且以双线性矩阵不等式的形式,分别给出了有时滞和无时滞网络系统能够达到一致的条件.最后仿真结果验证了所获结果的有效性.     

多树枝结构和立方结构PbS的水热合成及形成机理

在无模板条件下,用Pb(NO₃)₂做铅源,(CH₄N₂S)做硫源,用水热法在160 ℃反应24 h制备了结晶度好的多树枝结构PbS。利用XRD、SEM、EDX、TEM对产物进行了表征,结果表明所得产物为面心立方多树枝状结构,单个树枝的长度为1.0～3.0 μm。此外,在碱性条件下丙三醇/水体系中制备了具有不同凹面的立方结构PbS,边长为2.0～5.0 μm。对2种不同形态PbS的影响因素进行了讨论,并提出了形成机理。同时对其荧光及紫外性质进行了研究,结果表明立方结构的PbS在309和373.5 nm处出现了2个荧光峰,在211和232 nm处出现了2个紫外吸收峰。