小直径冷轧螺纹钢筋的力学性能及应用研究

从抗拉强度、屈服强度、伸长率、弹性模量、弯曲性等方面研究了小直径冷轧螺纹钢筋的力学性能,并研究了其在混凝土圆孔板中的应用。     

液晶可调谐光滤波器的实验研究

对液晶可调谐光滤波器进行了实验研究,初步研制出带宽0.3～0.5 nm,精细度为100～200,连续可调谐范围大于70 nm的液昌F-P腔光滤波器.     

双绞传输线电磁兼容特性的FDTD分析

将曲线坐标系中的时域有限差分法（FDTD）拓展到空间为任意媒质情形，然后针对双绞传输线的特殊结构综合运用曲线坐标系、圆柱坐标系、旋转坐标系和子域连接法进行空间网格划分、FDTD建模，并通过求解双绞传输线和平行传输线的特性阻抗对该建模的准确度进行了验证，最后在空间线源激励下对双绞线和平行线的电磁兼容特性进行了比较，可以看出双绞线对空间电磁场的耦合能力远远低于平行线。     

铜芯对绞电缆新的发展和应用

在信息高度发达的今天，计算机网络成为连接全球的电子纽带。当网络速度从早期的10Mb/s发展到1000Mb/s，综合布线系统，这一计算机网络的传输平台也发展为一个巨大的市场。随着高速计算机网络系统的兴起，综合布线正在进入一个新的时期。     

向列相液晶热光效应的实验研究

通过研究向列相液晶BL-009的折射率随温度的变化，探讨了向列相液晶的热光效应．测出了温度在20～100℃，入射光波长为630nm时液晶的双折射率随温度变化关系曲线，讨论了液晶双折射率随温度的变化规律．     

AWGN和FEXT噪声下铜双绞传输线的信道容量

本文研究加性白高斯噪声和远端串音两种噪声并存时铜双绞传输线的信道容量，用数值方法给出了不同线路长度和不同输入功率时的信道容量，研究了达到信道容量时的最优输入功率谱密度分布。计算结果表明，在加性白高斯噪声和远端串音同时存在时，信号的输入功率谱不再为均匀分布，这种不均匀性随着输入功率的增加更为明显。这与干扰为纯白高斯噪声时，最优输入功率谱近似为均匀分布的结果是不同的。     

双光轴偶氦液晶分子光致异构的机理研究

双光轴偶氮液晶（biaxial nematic azo liquid crystal）具有光致异构特性、良好的稳定性和可逆性等优点，可通过结构修饰和外部电场控制进一步提高材料性能，从而降低写入激光波长，提高稳定温度和反应速度，在高密度光学存储材料中具有极大的潜在应用价值。综述了双光轴偶氮液晶分子光致异构机理的近期研究结果，分析了它对偏振光选择吸收时发生顺反循环异构的动力学过程，展示了其实际应用。     

Electrical conductivity and luminescence of 9-chloro-10,10′-bis-(dichloromethyleno)-(9′H)-10,10′-dihydro-9,9′-bianthryl (CDDB)

The absorption and fluorescenc of 9-chloro-10,10′-bis-(dichloromethyleno)-(9′H)-10,10′-dihydro-9,9′-bianthryl (CDDB) has been studied in polar and nonpolar solvents and also in microcrystal. In polar solvents CDDB emits from two molecular forms, the normal charge transfer form (locally excited, LE form) and the solvent-induced twisted intramolecular charge transfer (TICT) form. Electrically, CDDB possesses semiconducting property with conductivity approximately 10⁻⁹ S cm⁻¹ and this conductivity further increases to 10⁻⁷ S cm⁻¹ on photoexcitation. Intramolecular charge transfer by hopping mechanism is assumed to be the main process for controlling activation energy and electronic conduction.     

Nonequilibrium molecular dynamics of liquid crystals

During the last 15 years, noneyuilibrium molecular dynamics (NEMD) has been successfully applied to study transport phenomena in fluids that are isotropic at equilibrium. A natural extension is therefore to study liquid crystals, which are anisotropic al equilibrium. The lower symmetry of these systems means that the linear transport coefficients are considerably more complicated than in an isotropic system. Part of the reason for this is that there are crosscouplings between tensors of different rank and parity. Such couplings arc symmetry-forbidden in isotropic phases. In this paper. we review some of fundamental theoretical results we have derived concerning the rheology of liquid crystals. report NEMD simulations of thermal conductivity and shear viscosity of liquid crystals, and present NEMD simulations of shear cessation phenomena. All of the NEMD results are presented for a model liquid crystal fluid which is a modification of the Gay-Borne fluid. The results obtained are in qualitative agreement with experimental measurements on liquid crystal systems.Paper presented at the Twelfth Symposium on Thermophysical Properties, June 19–24, 1994, Boulder, Colorado, U.S.A.     

Inside Front Cover: Construction of Chiral Propeller Architectures from Achiral Molecules (Adv. Mater. 24/2006)

Chiral propeller architectures constructed from achiral molecules via hydrogen bonding self‐assembly, in addition to Frank–Pryce spherulitic droplet and fingerprint textures, are reported on p. 3229 by Cheng and co‐workers. It is found, for the first time, that neither molecular chirality nor a molecular bend is necessary to form a chiral phase, which is of particular interest for next‐generation biological and electro‐optical materials science and technology.