关于气体中有无速率为无穷大分子的再讨论

本文以较简捷的方法讨论了气体分子速率问题，给出了计算分子最大速率的理论公式，通过这些讨论可更加深入地理解气体中分子的运动情况，准确地理解麦克斯韦速率分布函数。     

可调谐液晶法-珀滤光片的研究

提出了一种可用于密集波分复用系统中的新型可调谐滤光片的设计方法,该设计利用了液晶的双折射现象,以及液晶盒内法-珀效应,从理论上分析了器件的光谱特性,计算了液晶分子的折射率调制和其分子转动角度的关系.并对器件进行了性能测试.实验结果与理论吻合较好.     

Chiral Parameter of Transparent Films Containing Polymer Cholesteric Liquid Crystal-R

The transparent film containing a kind of polymer cholesteric liquid crystal-R was fabricated by the freezing method. The optical polarization response of the film was investigated by a self-manufactured apparatus and its optical rotatory dispersion was measured by a novel technique at the wavelength from 35Onto to 66Onto.At various wavelengths, the chiral parameter of the film has been obtained. The results show that the chiral parameter decreases as the wavelength increases. The maximum and minimum chiral parameters are 0.0343 at the wavelength of 350 nm and 0.0058 at the wavelength of 660 nm, respectively. The obtained data indicate that this kind of polymer cholesteric liquid crystal-R is a promising candidate host material for solid optical chiral waveguides.     

液晶显示器用导电粉的扫描电镜图像

液晶显示器用导电粉的形状、尺寸及偏差对于液晶显示屏的质量控制来说是非常重要的。论述了液晶显示器(LCD)用导电粉的作用和性能要求。给出了液晶显示器用导电粉的扫描电镜图像。该图像对观测导电粉的粒径分布、导电粉在导电点中的浓度和分析导电点缺陷、提高液晶显示器的产品质量具有一定的意义。     

Fast Optical Switching Using Oriented Cyanine Dye-Doped Nematic Liquid Crystal

A cyanine dye, 2-[7-（1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene）-1,3,5-heptatrienyl]-1,3,3-trimethyl-3H-indolium iodide （NK-125）, is doped in 4-cyano-4＇-pentylbiphenyl （5 CB）, and the mixture is sandwiched between two pieces of rubbed glass plates. The third-order nonlinear optical properties of the oriented NK-125-SCB layers are measured by the resonant femtosecond degenerate four-wave mixing （DFWM） technique at 760 nm. The third-order nonlinear optical susceptibility of one of the present samples is 5.5×10^-8 esu. The slow DFWM response of the NK-125-SCB layers due to a population grating is accelerated by the increasing laser power because of amplified spontaneous emission （ASE）. On the other hand, we do not observe a similar phenomenon for NK-125- polyethylene glycol （PEG-400）. Oriented NK-125 molecules in nematic liquid crystals must have very high ASE efficiency. Hence the population grating in a DFWM signal disappears within about 4 ps. It is expected that NK-125-SCB can be used as a material for very fast all-optical switching.     

A Convenient Synthetic Method of Metal Dendritic Porphyrins

Metal porphyrins are natural antioxidant reagent1-3. However, due to the characteristics of structures, they are only soluble in inorganic acids and part of polar organic solvents. Thus, it is limited to be used as effective pharmaceutical preparations. T…     

新型含氧亚甲基和亚胺桥键液晶化合物分子结构与光谱的密度泛函理论研究

采用密度泛函理论方法在B3LYP/6-31G*水平上对6个新型含氧亚甲基和亚胺桥键液晶化合物分子的几何结构进行优化计算,讨论了取代基H,CH3,CH3O,C2H5O,NO2,Cl对分子电荷、前线轨道能量和电子吸收光谱等性质的影响.在此基础上使用含时密度泛函理论方法计算了分子第一激发态的电子垂直跃迁能,得到最大吸收波长λmax.计算表明,取代基的引入导致最大吸收波长红移.     

有机自由基棒状希夫碱型磁性液晶

以丙基和戊基取代的反式双环己基、反式环己基苯基及联苯甲酸酯中介核与2,2,6,6-四甲基哌啶氧自由基(TEMPO)相连，制备了四个棒状希夫碱磁性液晶分子。其中两个化合物在偏光显微镜下呈现出向列相丝状和纹影织构。DSC测定显示其向列相温度范围4~6℃。EPR测定显示几个化合物具有顺磁性。     

开关结构对a-SiTFT-LCD光学特性的影响

分析非晶硅薄膜晶体管在a-SiTFT-LCD中的开关特性，讨论这种开关结构中的主要功能膜材料尺寸与性能参量、光刻制备工艺，存储电容以及栅脉冲延迟效应等对a-SiTFT-LCD的通断电流比，信号响应与保持特性，图像亮度与对比度等光学特性的影响。