介观含时电容耦合电路中压缩的产生及其在有限温度下的量子涨落

从电容和电感随时间变化的介观电容耦合电路的经典运动方程出发，在给定初始条件下，精确求解了电荷和电流涨落的时间演化规律，并考虑了温度对涨落的影响。在这样的电路中可以产生压缩，并将压缩参数与电路中的物理量联系了起来。     

Development of tyrosinase biosensor based on pH-sensitive field-effect transistors for phenols determination in water solutions

An enzyme biosensor for the determination of 4-chlorophenol in water solutions based on potentiometric pH-sensitive field-effect transistors as semiconductor transducer and tyrosinase immobilised in saturated glutaraldehyde vapours as biorecognition element has been described for the first time. The main analytical characteristics were studied under different conditions, as well as the possibility to optimise these working parameters. Different factors, such as pH of immobilisation, the enzyme loading and time of immobilisation in glutaralaldehyde vapours were investigated with regard to the influence on sensitivity, limit of detection, dynamic range, and operational and storage stability. The best result gives a limit of detection close to 20 ppm and a dynamic range from 25 to 1000 ppm with sensitivity 2 mV mM(-1). The operational stability was not less-than15 h and the R.S.D. were approximately 3% for intra-sensors responses and approximately 7% for inter-sensors responses. The storage stability was >15 days.     

Sorptive reconstruction of the CuAlCl(4) framework upon reversible ethylene binding

Three ethylene adducts to CuAlCl(4) have been characterized by single crystal and/or powder X-ray diffraction, (13)C, (27)Al and (63)Cu MAS NMR and diffuse reflectance UV-vis spectroscopy. (C(2)H(4))(2)CuAlCl(4), a = 7.1274(5) b = 12.509(1) c = 11.997(3) beta = 91.19 degrees, Pc, Z = 4; alpha-(C(2)H(4))CuAlCl(4), a =7.041(3) b = 10.754(8) c =11.742(9) beta = 102.48(6), P2(1), Z = 4 and beta-(C(2)H(4))CuAlCl(4), a = 7.306(2), b = 16.133(3), c = 7.094(1), Pna2(1), Z = 4. Up to 2 equiv of ethylene ( approximately 200 cm(3)/g relative to stp) are sorbed at room temperatures and pressures as low as 300 Torr. The ethylene ligands are bound to copper (I) primarily through a sigma-interaction, because the AlCl(4)(-) groups also bound to copper prevent any significant pi-back-bonding. The olefin binding is reversible and has been characterized by gravimetric and volumetric adsorption analysis and by time and pressure resolved synchrotron powder X-ray diffraction. Comparison of the parent crystal structure to those of the adduct phases provide an atomistic picture of the sorptive reconstruction reactions. These are proposed to proceed by a classic substitution mechanism that is directed by the van der Waals channels of the parent crystalline lattice.     

The partition function and state equation of the point group 12mm two-dimensional dodecagonal quasicrystal

This study extends the analysis of the vibrational spectrum of the one-dimensional hexagonal quasicrystal to the two-dimensional quasicrystal with the 12mm point group. Several thermodynamic functions and the state equation of the material are shown. Received 18 July 2002 Published online 27 January 2003 RID="a" ID="a"e-mail: litongtzb@263.net     

掺半导体玻璃波导的导波功率限制

首次利用阳极氧化法在掺半导体玻璃上制备了两端带有抛物耦合喇叭的4微米条宽沟道波导,用光栅耦合器将波长0.532微米的YAG倍频激光耦合进波导中,实现了输出光的功率限制.     

导波弧光栅的曲率分布及实验设计

本文由柱面透镜会聚光的波前干涉场强度分布推导了弧光栅条纹的周期方程和曲率方程，为设计和制备各种周期和曲率的导波弧光栅器件提供了依据．     

偏振三光子跃迁讯号的理论计算

本文从密度矩阵运动方程出发, 对四能级阶跃型及折迭型能级结构的分子系纬与不同性质偏振激光场作用时, 可能发生的五种近共振增强三光子电子跃迁分别作了具体推导, 获得了以第三跃迁为探测跃迁时的实验讯号强度及光谱特征解析式. 通过与三能级系统作比较, 发现其线型因子、谱线强度因子均有不同程度的增大, 使讯号相对强度有数量级的提高. 最后还讨论了所得讯号在分子光谱分析中的应用前景. 关键词：