Microcolumn liquid chromatography with inductively-coupled plasma atomic emission spectronometric detection

Summary An ICP detector is described which is compatible with microcolumn liquid chromatography. The total column effluent is concentrically nebulized and aspirated into a plasma flame. The carbon compounds are selectively detected by monitoring the characteristic emission line at 247.9 nm using water or aqueous solutions as the mobile phase. The detection limit for carbon is 500 ng or less, and the response is linear over at least two decades. The potential of this system is illustrated by a few applications.     

舰用红外搜索和跟踪系统

综述了２０００年舰用红外搜索和跟踪（ＩＲＳＴ）系统的发展趋势和技术特点，并简介几种研制中的新一代ＩＲＳＴ系统。     

用于受激光散射实验的光学多道分析器

使用自制的以ＣＣＤ成像器件为探测器的简易光学多道分析器完成了受激光散射谱的系集与处理。该多过分析器空间分辨率１４μｍ，灵敏度０．１ＬＸ，给出了装置的设计以及所得到的谱图     

红外光纤与PbS红外探测器耦合研究

本文以红外光纤与PbS红外探测器相耦合,构成“带尾钎”的新型组合件。基于光纤波导可绕曲性使红外探测器在红外系统中的位置有更多的随意性和灵活性,并能有效减小杂散光的干扰,改善系统的信噪比。     

Interfaces as design tools for short-period InAs/GaSb type-II superlattices for mid-infrared detectors

The effect of interface anisotropy on the electronic structure of InAs/GaSb type-II superlattices is exploited in the design of thin-layer superlattices for mid-IR detection threshold. The design is based on a theoretical envelope function model that incorporates the change of anion and cation species across InAs/GaSb interfaces, in particular, across the preferred InSb interface. The model predicts that a given threshold can be reached for a range of superlattice periods with InAs and GaSb layers as thin as a few monolayers. Although the oscillator strengths are predicted to be larger for thinner period superlattices, the absorption coefficients are comparable because of the compensating effect of larger band widths. However, larger intervalence band separations for thinner-period samples should lead to longer minority electron Auger lifetimes and higher operating temperatures in p-type SLs. In addition, the hole masses for thinner-period samples are on the order the free-electron mass rather than being effectively infinite for the wider period samples. Therefore, holes should also contribute to photoresponse. A number of superlattices with periods ranging from 50.6 to 21.2 Å for the 4 μm detection threshold were grown by molecular beam epitaxy based on the model design. Low temperature photoluminescence and photoresponse spectra confirmed that the superlattice band gaps remained constant at 330 meV although the period changed by the factor of 2.5. Overall, the present study points to the importance of interfaces as a tool in the design and growth of thin superlattices for mid-IR detectors for room temperature operation.     

激淋降膜蒸发多效紧凑式海水淡化装置的研究

基于降膜蒸发与降膜凝结机理,设计建造了一台具有三效回热性能的紧凑式小型海水淡化装置,用电加热水箱模拟热源对该装置进行了实验测试.实验结果表明,由于在本蒸馏系统中采用了多项降膜蒸发及降膜凝结技术,使其中大部分的蒸汽潜热及部分盐水的显热得到了多次重复利用,因而装置有较高的产水率.在供热水温度为75℃、系统内部压力为15kPa时,产水率达到110kg/h。对影响产水率的主要因素作了探索与分析,给出了合理的取值范围.     

城市生活垃圾卧式气流分选的设计研究

卧式气流分选机是生活垃圾分选过程中常用的设备,但国内对其研究很少.本实验通过自行设计的分选机(处理量100kg·d-1),对卧式气流分选机分选基本规律进行研究表明,风选机中挡板的存在对分选效果产生不利影响.在无挡板的条件下,对于单物质纸的分选效果表明,风机角度的增大、风速的提高有助于分选效率的提高.在纸、塑料和纤维3种物质中,塑料更易分选,而纸和纤维的混合物,分离效果差.     

混合式红外焦平面阵列的进展

着重介绍锑化 (InSb)、碲镉汞(HgCdTe)、硅化铂(PtSi)等混合式红外焦平面阵列(HIRFPA)的现状和发展前景。     

A PSD-based electronic system for AC response studies of superionic conductors

An electronic system based on quadrature oscillator, current-to-voltage converter and phase sensitive detector (PSD) has been designed and constructed for measurement of AC electrical conductivity and complex impedance/admittance on ionic and superionic conductors at several frequencies upto 60 kHz. The design incorporates a CMOS FET switch controlled by two anti-square reference signals for rectification and a differential amplifier for summation and impedance matching. The performance of the system has been demonstrated and the measurement possibilities discussed.