红外焦平面阵列技术

本文讨论第二代高性能热摄象传感器——红外焦平面阵列技术的特点、结构形式、实现红外焦平面陈列工作结构选择与利弊及其某些新结构。     

细胞色素C在SAM修饰电极上的电化学行为

应用循环伏安法研究了细胞色素c在2-氨基乙硫醇自组装膜修饰金电极上的电化学行为。结果表明,细胞色素c在2-氨基乙硫醇修饰的金电极上的电子传递过程为—扩散控制的可逆反应,2-氨基乙硫醇自组装膜可用作细胞色素c电子传递的有效促进剂。依据电化学石英晶体微天平和电化学交流阻抗谱的测量结果,讨论了单分子膜的组装过程及其对促进细胞色素c电子传递的作用机制。     

Interaction of Co, Mn, Mg and Al with d(GCCCATGGC) and d(CCGGGCCCGG): a spectroscopic study

Spectroscopic study of the interactions of metal ions, Co, Mn, Mg and Al with d(GCCCATGGGC) and d(CCGGGCCCGG) revealed the following. Metal ions Mn, Al and Mg at the lowest concentrations enhanced the t _m of oligomers, whereas Mn and Mg at higher concentrations decreased the t _m . Co enhanced the t _m of oligomers at higher concentrations. The studies have also indicated that Mn at lower concentrations displaced EtBr fluorescence, Mg and Co at moderate concentrations and Al only at higher concentrations. Addition of Co, Mn, Mg and Al altered the bands of the circulars dichroism (CD) spectra of the oligomers in a concentration-dependent manner. The CD spectra of d(GCCCATGGGC) and d(CCGGGCCCGG) indicated B and Z forms of DNA, respectively, in contrast to the A form observed in the crystal structures. Mg and Co at different ionic strength induced Z–B transition in d(CCGGGCCCGG), while Al at higher concentrations induced a Z–A transition. Mn did not induce any transition. This is the first report to show that Al causes structural transitions in sequence-specific oligomers and has strong binding ability with GC-rich euchromatin oligomers. Received 22 December 1997; received after revision 16 March 1998; accepted 16 March 1998     

TiAlN 保护膜的制备及结构研究

用反应磁控溅射方法制备了ＴｉＡｌＮ薄膜,结构分析表明,当Ｔｉ的含量小于０．２５时,ＴｉＡｌＮ薄膜是Ａｌ基氮化物的闪锌矿结构,但晶格常数随Ｔｉ原子含量的增加而增大．Ｘ射线光电子能谱分析表明,ＴｉＡｌＮ薄膜有与ＡｌＮ和ＴｉＮ不同的电子结构特征．     

用椭圆偏振光谱法研究Ga_xIn_(1-x)P的光学性质(Ⅰ)

用变入射角椭圆偏振技术测量了用金属有机气相沉积（ＭＯＣＶＤ）方法在ＧａＡｓ衬底上生长的ＧａｘＩｎ１－ｘＰ以及掺Ｓｉ和掺Ｚｎ样品在可见光区室温下的光学常数．对其结果进行了讨论,给出了带隙Ｅｇ和跃迁Ｅｇ＋Δ０的能量值,Δ０的实验值与计算值符合的很好．     

Influence of the amplitude ratio between two terahertz pulses on two-dimensional spectroscopy

The influence of the amplitude ratio between the two THz pulses on two-dimension THz spectroscopy （2DTS） has been studied theoretically via a classical method in which the expressions for the second-order nonlinearity were derived using perturbation approach, and the THz pulses were not treated as a delta function. Three types of nonlinear sources i.e., anharmonicity, nonlinear damping, and nonlinear coupling, are considered in a single mode system. The simulation results demonstrated that the amplitude ratio had a notable influence on the 2DTSs, and different sources have different influences. This study is promising for guiding future experiments.     

基于红外光谱的稠油界面检测方法研究

稠油界面检测对于稠油的开采利用具有重要意义,然而现有的检测技术效率差,准确率低。建立了稠油和水的热传递模型,主要是热传导和热对流模型,同时也提出了固体壁面的热传递模型,主要是热辐射模型,进行了稠油粘度与温度的实验测定,提出了黏温关系模型。设计了以红外光谱为探测元的界面检测实验,采用了铜和玻璃两种热传导介质,与实验测温结果与传导对流模型一致,证明了所提模型的正确性。     

Compact fiber-optic diode-laser sensor system for wide-dynamic-range relative humidity measurement

A compact fiber-optic diode-laser sensor system for measuring relative humidity is studied. In such a system, a distributed feedback laser lasing near 1877 nm is used as light source while a high-precision Pt resistance as temperature sensor, an accuracy of 0.1% relative-humidity can be achieved. The laser sensor system is able to lock to the absorption peak and calculate the density of water vapor without any additional reference measurements. Using programs built in to the microcontroller unit, the laser system can switch functions between direct measurement at high density and second-harmonic detection at low density. The system can switch between the two modes automatically and work in a wide dynamic range.