胍盐离子液体捕获CO2温室气体的机理

通过量子力学与分子动力学对胍盐离子液体的模拟表明,胍阳离子与氯负离子之间存在较强的相互作用,其相互作用能约为-109．216kcal／m01．从能量与几何分布可见,两种空间分布方式中最稳定构象为Middle作用模式．径向分布函数也验证了这一结论．C02含量的不断增加并没有对离子液体的结构产生影响,而是被离子液体的空腔捕获．     

非晶Nb-Ni薄膜用于Cu与Si之间阻挡层的性能和结构的研究

采用射频磁控溅射法架构了Cu(50 nm)/Nb-Ni(50 nm)/Si异质结,利用四探针电阻测试仪、X射线衍射仪和原子力显微镜等研究了样品在不同温度下高真空退火后的结构及输运性质.结果表明:经退火处理后的样品的方块电阻均小于常温下样品的方块电阻;X射线衍射图谱中,各个退火温度下均没有Nb-Ni结晶峰和其它杂峰出现;在AFM图像中,随着退火温度的上升,样品表面的粗糙度逐渐增加,晶粒的尺寸也在逐渐增大,直到当退火温度达到750℃左右,样品表面布满了岛状晶粒进而导致阻挡层失效.     

太阳能电池材料-铜锌锡硫化合物薄膜制备及器件应用研究进展

锌黄锡矿结构的CZTS（铜锌锡硫）材料与目前在薄膜太阳能电池领域表现出色的黄铜矿结构的CIGS（铜铟镓硒）材料具有相似的晶体结构,且CZTS有着很好的光电性能,组成元素在地球上含量丰富,安全无毒,非常适合用来发展高效、廉价的太阳能电池.近期CZTS类太阳能电池的最高效率已达到12.6%,在科研和产业领域引起了广泛关注.在简介了“新星”太阳能电池材料CZTS的性质及薄膜太阳能电池器件的基本结构之后,重点总结了CZTS薄膜的制备方法（真空、非真空法）以及相应器件效率,其中对众多非真空制备法进行了独到的归类总结.最后,对CZTS薄膜的优化方法进行了分析,并对其未来发展方向做了展望.     

The effects of sapphire nitridation on GaN growth by metalorganic chemical vapour deposition

In situ optical reflectivity measurements are employed to monitor the GaN epilayer growth process above a low-temperature GaN buffer layer on a c-plane sapphire substrate by metalorganic chemical vapour deposition. It is found that the lateral growth of the GaN islands and their coalescence are promoted in the initial growth stage if optimized nitridation time and temperature are selected when the substrate is pre-exposed to ammonia. As confirmed by atomic force microscopy observations, the quality of the GaN epilayers is closely dependent on the surface morphology of the nitridated buffer layer, especially grain size and nucleation density.     

高效液相色谱法同时测定染发剂中11种氨基苯酚

建立了高效液相色谱测定直接型与氧化型染发剂中11种氨基苯酚含量的分析方法。样品在亚硫酸氢钠的保护下用甲醇提取,高速冷冻离心净化;采用Agilent Zorbax SB C18色谱柱分离,流动相为5 mmol/L庚烷磺酸钠-40 mmol/L pH 2.8磷酸盐缓冲液和乙腈,梯度洗脱,11种氨基苯酚分别于230、270和400 nm下检测。11种氨基苯酚在0.05～500 mg/L线性范围内相关系数不小于0.9992,4-氨基-3-硝基苯酚、2-氨基-5-硝基苯酚、3-硝基-4-(2-羟乙基)氨基苯酚的方法定量限为5 mg/kg,其他8种氨基苯酚包括对氨基苯酚、对甲氨基苯酚、间氨基苯酚、邻氨基苯酚、5-氨基-2-甲基苯酚、4-氨基-3-甲基苯酚、2-甲基-5-(2-羟乙基)氨基苯酚和2-氨基-4-硝基苯酚定量限为20 mg/kg,方法回收率为88.5%～109.5%,相对标准偏差为2.2%～8.3%。测定了多种市售染发剂,结果表明该方法操作简单、测定结果准确,可用于直接型与氧化型染发剂中11种氨基苯酚的测定。     

SiC纤维增强Ti17合金复合材料轴向残余应力的拉曼光谱和X射线衍射法对比研究

准确测量和分析SiC纤维增强Ti合金复合材料(SiC_f/Ti)中残余应力状态对优化复合材料的成型工艺和理解其失效模式具有重要意义,但其残余应力的实验测量和分析仍是一个挑战.石墨C涂层作为SiC纤维与Ti17基体合金之间必需的扩散障涂层,承载了由纤维与基体之间热不匹配引入的残余应力.本文采用显微拉曼光谱法对比测量纤维表面C涂层在复合材料中和去掉基体无应力态下G峰的峰位,通过石墨C涂层应力态下峰位移动计算出SiCf/C/Ti17复合材料中SiC纤维受到～705.0 MPa的残余压应力.采用X射线衍射方法测量了不同方向上该复合材料中基体钛合金的晶面间距以获取其空间应变,根据三轴应力模型分析了复合材料中基体钛合金沿轴向方向的残余应力为～701.3 MPa的张应力,并通过线性弹性理论转化为SiC纤维的残余压应力为～759.4 MPa.两种测试方法都确定了SiC纤维在成型过程中受到残余压应力,且获得的应力值较为接近,都可以用于对SiC_f/Ti复合材料的残余应力测量.     

Investigation of voltammetric enzyme-linked immunoassay based on new system of ODA-H_2O_2-HRP

A voltammetric enzyme-linked immunoassay based on a new system of ODA-H2O2-HRP has first been developed and used in the detection of HRP and labelled HRP. By this method, the enzyme-catalyzing reaction of H2O2 oxidizing odianisidine (ODA) couples the electrode-reduction reaction of the oxidizing product of odianisidine, which produces a sensitive polarographic wave at potential of -0.56V (SCE) in Britton-Robinson buffer solution. In using this polarographic wave, a detection limit to HRP is 3.7×10-12g/mL and a linear range 1.0×10-11-2.0×10-9g/mL. And the mechanisms of the coupling reaction and the process of electro-reduction in the ODA-H2O2-HRP voltammetric enzyme-linked immunoassay system have also been carefully studied.     

基于变权重正交变换的腈纶/棉运动纤维面料近红外光谱识别和信息增强机制

为全面阐释近红外光谱技术在纺织服装行业质量控制中的应用难题,本论文以腈纶/棉混纺纤维运动面料为对象,针对纤维面料的重叠信息精准选择和预处理技术直观化筛选应用进行研究。同时,以混纺纤维中的棉含量为指标,对纺织面料近红外定量模型建立中的分子信息识别和应用机制、建模样品及常规光谱处理对构建模型的影响进行了系统解释。最后,通过变权重正交变换算法计算从分子层面解析了纤维面料谱峰信息差异化贡献及纤维面料散射对定量模型构建和预测稳定性的影响。以期为我国纺织行业及纤维制品的精准化控制和质量表征特异化设备开发提供技术指导和参考。     

Effects of polarization and p-type GaN resistivity on the spectral response of InGaN/GaN multiple quantum well solar cells

Effects of polarization and p-type GaN resistivity on the spectral response of InGaN/GaN multiple quantum well(MQW) solar cells are investigated. It is found that due to the reduction of piezoelectric polarization and the enhancement of tunneling transport of photo-generated carriers in MQWs, the external quantum efficiency(EQE) of the solar cells increases in a low energy spectral range(λ 370 nm) when the barrier thickness value decreases from 15 nm to 7.5 nm. But the EQE decreases abruptly when the barrier thickness value decreases down to 3.75 nm. The reasons for these experimental results are analyzed. We are aware that the reduction of depletion width in MQW region, caused by the high resistivity of the p-type GaN layer may be the main reason for the abnormally low EQE value at long wavelengths(λ 370 nm).     

Non-contact angle measurement based on parallel multiplex laser feedback interferometry

We present a novel precise angle measurement scheme based on parallel multiplex laser feedback interferometry （PLFI）, which outputs two parallel laser beams and thus their displacement difference reflects the angle variation of the target. Due to its ultrahigh sensitivity to the feedback light, PLFI realizes the direct non-contact measurement of non- cooperative targets. Experimental results show that PLFI has an accuracy of 8＂ within a range of 1400＂. The yaw of a guide is also measured and the experimental results agree with those of the dual-frequency laser interferometer Agilent 5529A.