甲醇作为压标的拉曼研究

 利用立方氧化锆压腔研究了甲醇在温度301 K、压力169.2~713.8 MPa下C—H伸缩振动ν_{2 835}的拉曼特征,实验结果表明：在试验的压力范围内甲醇稳定,其拉曼位移和压力具有很好的线性关系。加上常压下的数据,拟合后得出压力与甲醇2 835 cm^-1拉曼线频率位移的关系为：p= -3.508 9[(Δν_p)_{2 835}]²+135.17 (Δν_p)_{2 835}+54.397(0.1~713.8 MPa)。因此在实验的压力范围内甲醇作为压标非常合适。     

High-precision method for measuring the photothermal properties of transparent media with digital holography

Quantitative phase microscopy by digital holography provides direct access to the phase profile of a transparent subject with high precision.This is useful for observing phenomena that modulate phase,but are otherwise difficult or impossible to detect.In this letter,a carefully constructed digital holographic apparatus is used to measure optically induced thermal lensing with an optical path difference precision of less than 1 nm.Furthermore,by taking advantage of the radial symmetry of a thermal lens,such data are processed to determine the absorption coefficient of transparent media with precisions as low as 1×10-5 cm-1 using low power(30 mW) continuous wave(CW) excitation.     

一种基于离散粒子群优化算法的高光谱图像端元提取方法

针对混合像元分解过程中,由于数据噪声引起的端元提取不准确问题,引入了群智能算法中的粒子群优化算法,并对粒子群优化算法进行了改进,重新定义了位置和速度的表示方法和更新策略,得到离散粒子群优化(discrete particle swarm optimization,D-PSO),能够在离散空间中进行搜索,解决组合优化问题。同时,通过定义目标函数和可行解空间,将端元提取问题改写成组合优化问题,最终实现利用D-PSO进行端元提取。在给出算法的详细流程之后,文章通过一组模拟数据实验和一组实际数据实验验证了D-PSO算法对于具有较大噪声的数据的适应性和提取端元的可信程度,并分析了不同参数对于算法性能的影响。     

Synthesis and Electrical Properties of New Solid State Electrolyte Materials Ce_(6-x)Ho_xMoO_(15-δ)(0.0≤x≤1.2)

Ce6-xHoxMoO15-δ(0.0≤x≤1.2) was synthesized by modified sol-gel method and characterized by diffe-rential X-ray diffraction(XRD), Raman, and X-ray photoelectron spectroscopy(XPS) methods. The oxide ionic con-ductivity of the samples was investigated by AC impedance spectroscopy. It shows that all the samples are single phase with a cubic fluorite structure. The solid solution Ce6-xHoxMoO15-δ(x=0.6) was detected to be the best con-ducting phase with the highest conductivity(σt=1.05×10-2 S/cm) at 800 ℃ and the lowest activation energy(Ea=1.09eV). These properties suggest that this kind of material has a potential application in intermediate-low temperature solid oxide fuel cells.     

2-氨基-4-磺酸基-丁酸及其金属离子络合物的光谱研究

本处次对２－氨基－４－磺酸基－丁酸的红外光谱作了初步指认,并早此对其存在形式作出判断、同时,合成了２－氨基－４－磺酸基－丁酸与Ｎａ＾＋、Ｋ＾＋、Ｃａ＾２＋形成的络合物,对其红外光谱及拉曼光谱进行了分析讨论,并对其配位方式进行了比较。结果表明形成络合物后,羟基、磺酸基均参与配位,且破坏了原有分子间的氢键网络,进行了分子间的重新组合。