基于可调谐半导体激光器吸收光谱的温度测量方法研究

介绍了基于半导体激光器作光源的吸收光谱测温技术研究和开发集成的系统,利用H₂O在1.4μm附近的吸收线对的线强比值来反演温度.介绍了该系统在实验室管式高温上的标定和开放炉管的测量验证,结果显示各设置温度下测量温度波动平均在50 K左右.之后在CH₄/空气预混平焰炉上进行进一步验证,发现在吸收线7153.7 cm^-1长波一侧出现了HITRAN08中未给出的几条H₂O吸收和该吸收线重叠.HITEMP中在这些波长上有对应的吸收线给出,但对另一条选用的吸收7154.354 cm^-1,给出的可对应吸收线中心频率和测量不一致.根据实验测量结果和HITRAN/HIlTEMP的对比,对选择吸收线对的位置和线强等参数继续采用实验室标定结果,并引入HlTEMP中给出的这些高温下表现出来的吸收线参数,在平焰炉不同当量比状态下做了测量对比.     

双道原子荧光光谱法同时测定农产品中的砷和硒

研究了AFS-930型双道原子荧光光度计同时测定农产品中砷和硒的方法.该法快速,简便,准确,砷回收率为91.9%-99.6%,硒回收率为93.5%-103.8%,相对标准偏差(RSD)砷小于2%,硒小于1%,检出限分别为0.035μg/L和0.038μg/L.     

A-B效应的动力学机制及其实验验证方案

主要讨论了A-B效应所产生的动力学机制，指出运动电子所产生的磁场和外磁场的相互叠加是产生A-B效应的动力学原因。如果能够屏蔽掉运动电子所产生的磁场使之不能和外磁场相互叠加，那么A-B效应也将随之消失。为了验证这一结论，提出了一种新的实验方案，该方案可以对A-B效应的动力学机制做出明确的判断。 关键词： A-B效应 超导电性 迈斯纳效应 介观物理     

微波消解-火焰原子吸收光谱法测定环境土壤中的总铬

应用微波消解-火焰原子吸收光谱法测定环境土壤中总铬的含量.土壤样品经HNO3+HzO2微波消解体系消解后,采用氯化铵作为基体改进剂,用原子吸收分光光度计在波长357.9nm,富燃烧性(还原性)火焰中测定土壤中的铬.铬含量在0-2.00mg/L范围与吸光度呈良好的线性关系,线性相关系数r=0.9993,最低检出限为5.0...     

钯和铂金属在石墨烯表面不同生长机理第一性原理研究

本文采用密度泛函计算方法,研究了钯和铂金属在石墨烯表面不同的生长机理.几何结构和电子结构分析表明,钯金属的d2z轨道电子通过石墨烯的π电子为中介,转移电子至钯金属的dxz+dyz轨道,并保持石墨烯的π电子不变.该电荷转移机理增强了钯金属与石墨烯衬底之间的相互作用,是钯在石墨烯表面生长的主要原因.反之,铂金属不存在该生长机理,而铂原子的自发团聚是铂金属无法在石墨烯表面生长的另一主要原因.     

Implementing the Deutsch's algorithm with spin-orbital angular momentum of photon without interferometer

Deutsch's algorithm is the simplest quantum algorithm which shows the acceleration of quantum computer. In this paper, we theoretically advance a scheme to implement quantum Deutsch's algorithm in spin-orbital angular momentum space. Our scheme exploits a newly developed optical device called "q-plate", which can couple and manipulate the spin-orbital angular momentum simultaneously. This experimental setup is of high stability and efficiency theoretically for there is no interferometer in it.     

大孔SiO_2/ATO电极的制备及其电化学性能研究

以大孔SiO2为载体,通过SnCl2/SbCl3的乙二醇溶液的浸渍,孔道内两步水解和高温煅烧等处理,制备出大尺寸大孔径的ATO/SiO2导电材料,用SEM﹑FTIR﹑XRD﹑XPS对其进行结构表征,用稳态极化和苯胺电化学聚合研究其电化学特性。结果表明,ATO以10nm尺寸的微粒形式均匀致密的负载在SiO2薄层上,电导率随ATO含量的增加而提高,负载三次后的体积电阻是18Ω·cm,比表面积达到77m2·g-1。ATO/SiO2大孔电极在酸性和中性条件下分别具有2.5和2.2V的析氧电位。SiO2/ATO电极在恒电流下可以使苯胺发生电氧化聚合,并在ATO表面覆盖上聚苯胺导电膜,循环伏安实验表明聚苯胺具有电活性,并且电信号随着电极润湿程度的增加而增加,表明大孔电极的高比表面积对电化学反应有促进作用。     

电喷雾解吸电离质谱法快速测定多种表面痕量三硝基甲苯

1 引言 复杂基体样品中痕量三硝基甲苯(TNT)的快速检测是爆炸物检测研究的热点之一.TNT检测方法主要有传感器、光谱、色谱、离子淌度谱、质谱等多种.     

Synthesis and Crystal Structure of an Incomplete Cubane-type Mo3S4 Cluster with the N-N-O Type Tridentate Ligand:{Mo3S4[NH2CH2CH(O)CH2NH2]3}(DTP)·(H2O)2·(DMF)

A new cluster {Mo3S4[NH2CH2CH(O)CH2NH2]3}(DTP)·(H2O)2·(DMF) (DTP = diethyldithiophosphate) has been synthesized via ligand substitution reaction of Mo3S4(DTP)4(H2O) with an alkaline ligand 1,3-diamino-2-propanol(DAPROH) in a mixed organic solvent, and its crys- tal structure was determined with the following data: Mo3S6PC16H48O8N7, Mr = 977.76, triclinic, space group P, Z = 2, a = 10.319(2), b = 12.843(3), c = 15.335(3)(A), α = 65.26(3), β = 82.18(3), γ = 70.67(3)o, V = 1741.7(6) (A)3, Dc = 1.864 g/cm3, μ = 1.517 mm-1, F(000) = 988, the final R = 0.0794 and wR = 0.2111 for 6318 observed reflections (I>2σ(I)). The structure analysis indicates that all DTP ligands of Mo3S4(DTP)4(H2O) are replaced and each DAPRO molecule acts as a tri- dentate ligand chelating to each Mo atom of the Mo3S4 core. Different from the precursor, the clus- ter symmetry is elevated to C3. In addition, the UV-spectrum of the title compound was measured.     

Synthesis and Crystal Structure of Binuclear Silver(Ⅰ)Complex with 2-nitro-(2-pyridylsulfanylmethyl)benzene

The reaction of 2-nitro-(2-pyridylsulfanylmethyl)benzene L with silver nitrate produces a centrosymmetric binuclear complex bis(2-nitro-(2-pyridylsulfanylmethyl)benzene-N,S)-bis(nitrato-O,O)-disilver(Ⅰ), [AgLNO3]2 1. The crystal is of triclinic, space group P1, with a = 7.383(3), b = 8.340(3), c = 12.003(4) A, a = 95.069(6), β = 93.498(5), γ = 102.734(6)°, C24H2oAg2N6-O10S2, Mr= 832.32, V= 715.6(4) A3, Z = 1, Dc = 1.931 g/cm3, F(000) = 412, μ = 1.581 mm-1, R=0.0351 and wR = 0.0749 Each silver atom is tetrahedrally coordinated by two O atoms from bidentate nitrate, one S atom from a ligand and one N atom from another ligand. Furthermore, AgAg interactions have been observed in the complex.