硫氰酸铵树脂相分光光度法同时测定天然水中微量铁和钴

研究了在Ｔｗｅｅｎ－８０存在的酸性介质中，Ｆｅ（Ⅲ）和Ｃｏ（Ⅱ）与ＳＣＮ＾－形成稳定的有色络阴离子与阴树脂交换吸附，有色络合物富集显色于树脂组上，进行树脂组分光光度集显色于树脂相上，进行树脂相分光光度法同时测定铁和钴的实验条件，Ｆｅ（Ⅲ）和Ｃｏ（Ⅱ）树脂具有色络合物最大吸收波长λｍａｘ分别为４９０ｎｍ和６３０ｎｍ，摩尔吸光系数，ε为２．４×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１和２．１×１０＾５Ｌ．     

离子交换树脂相光度法测定钯的研究

根据钯（Ⅱ）与１－（５－溴－２－吡啶偶氮）－２－萘酚－６－磺酸（５－Ｂｒ－ＰＡＮ－Ｓ）形成稳定络合物这一物质,利用阴离子交换树脂为吸附载体,建立了离子交换树脂相光度法测定钯的新方法。以最大吸收波长６９０ｎｍ为测定波长,８００ｎｍ为参比波长,用双波长法进行测定,灵敏度高,选择性,重现性好,钯量在０￣２０μｇ范围内服从比尔定律。方法用于合成水样及催化剂中钯的测定,结果满意。     

溶剂萃取原子吸收光谱法测定建材样品中微量铁

本文研究了在微酸性介质中用抗坏血酸还原Ｆｅ（Ⅲ），Ｆｅ（Ⅱ）与１，１０－二氮杂菲（ｐｈｅｎ）形成Ｆｅ（ｐｈｅｎ）＾２＋３配合物，加入ＣｌＯ＾－４阴离子与之形成离子缔合物，再用有机溶剂硝基苯萃取，火焰原子吸收测定有机相。本法检出限为１．１ｎｇ／ｍＬ，回收率为９８．５％－１０６％。     

邻苯二酚显色树脂相分光光度法同时测定地下水中微量铁(Ⅲ)和钼(Ⅵ)

研究了铁（Ⅲ）和钼（Ⅵ）与邻苯二酚在ｐＨ ６．２０ 微酸性介质中反应生成的有色配合物与７１７型强碱性阴离子交换树脂的交换吸附,探讨了树脂相分光光度法同时测定铁（Ⅲ）和钼（Ⅵ）的实验条件。铁（Ⅲ）和钼（Ⅵ）树脂相有色配合物的最大吸收波长分别为５２０ ｎｍ 和４００ ｎｍ ,表观摩尔吸光系数ε为４．１×１０４ Ｌ／（ｍ ｏｌ·ｃｍ ）和９．０×１０４ Ｌ／（ｍ ｏｌ·ｃｍ ）,符合Ｂｅｅｒ定律的范围为０～２．２ ｍ ｇ·Ｌ－ １和０～１．６ ｍ ｇ·Ｌ－ １。此法用于地下水中微量铁和钼的测定,相对标准偏差为３．３ ％ 和３．２ ％ 。     

胶束增敏荧光光度法测定螺内酯的研究

本文用荧光光度法对硫酸介质中螺内酯和十二烷基硫酸钠（ＳＤＳ）形成的胶束配合物的性能进行了系统研究。利用胶束的增敏增稳作用,提出了测定螺内酯的荧光光度新方法,方法线性范围宽,为１．４×１０－９－４．３×１０－６ｍｏｌ·Ｌ－１,灵敏度高,检出限为１．２×１０－９ｍｏｌ·Ｌ－１。应用本法于片剂中螺内酯的测定,结果满意     

钡-偶氮胂Ⅲ-锌(钴)-邻菲口罗啉多元配合物显色反应的研究

在近中性环境中，研究了钡与偶氮胂Ⅲ、锌（钴）、邻菲口罗啉形成多元配合物的条件及其配合物组成。显色体系的摩尔吸光系数由二元配合物的２．１×１０４Ｌ·ｍｏｌ－１·ｃｍ－１提高到７．４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。用此方法，经过简单的分离后，可作硅钡合金中钡的光度法测定。     

胶束增效荧光光度法测定螺内酯的研究

本文用荧光光度法对硫酸介质中螺内酯和十二烷基硫酸钠（ＳＤＳ）形成的胶束配合物的进行了系统研究。利用胶束的增敏增稳作用,提出了测定螺内酯的荧光光度新方法,方法线性范围宽,为１．４×１０＾－９－４．３×１０＾－６ｍｏｌ·Ｌ＾－１,灵敏度高,检出限为１．２×１０＾－９ｍｏｌ·Ｌ＾－１,应用本法于片剂中螺内酯的测定,结果满意。     

原子吸收光度法测定钢铁及合金中的铌量

本法叙述了一氧化二氮－乙炔火焰原子吸收光度法测定铌量，用鞣酸沉淀分离和在盐酸－氢氟酸介质中加入增感剂三氯化铝，灵敏度１２μｇ／ｍＬ／１％吸收，检出限６．１μｇ／ｍＬ。     

分光光度法测定生药中微量元素锌

采用湿法消解样品,用０．１％ＰＡＮ「１－２（－吡啶偶氮）２－萘酚」－２０％ＯＰ（聚乙二醇辛基苯基醚）显色分光光度法测定１０种生药中微量元素锌。     

卡尔曼波滤—分光光度法用于有机反应动力学研究

本文将卡尔曼滤波－分光光度法用于α－羰基烯顺环二硫代缩酮化合物的化学动力学研究。结果表明，用该方法能够有效地消除或减小组分间的干扰，从而进行混合体系中各组分的同时测定。该方法成功地用于１－苯基－２－（１，２－亚忆充基）亚甲基－１，３二本号间硝基苯甲醛的缩合反应动力学研究 中。     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

Characterization of PolyA and PolyC mismatches by Raman spectroscopy

A.C mismatches are studied by Raman spectral characterization of PolyA, PolyC, and their equimolar complex in solution of 0.14 mol/L Na ,pH7.0.Experimental results show that A·C mismatches occur to be A/B (mainly A) conformers, and unlike Watson-Crick base pairing, this kind of mismatches is stabilized by only one hydrogen bond involving cytosine N4H2 and adenine N7.The formation of A·C complex makes the base stacking interactions much stronger, and conformation of the backbone more ordered, which leads to obvious Raman hypochromic effect with some shifts in corresponding bands.     

Improvement of four-wave mixing-based wavelength conversion efficiency in dispersion shifted fiber by 40-GHz clock pumping

40-GHz clock modulated signal as a pump to improve the efficiency of four-wave mixing (FWM)-based wavelength conversion in a 26.5-km dispersion shifted fiber (DSF) is investigated. The experimental results demonstrate that the conjugated FWM component has higher intensity with the clock pumping than that with the continuous-wave (CW) light pumping. The improvement of FWM-based wavelength conversion efficiency is negligible when the pump power is less than Brillouin threshold. But when the pump power is greater than Brillouin threshold, the improvement becomes significant and increases with the increment of pump power. The improvement can increase up to 9 dB if pump power reaches 17 dBm.     

Multi-pulse operation of a Kerr-lens mode-locked femtosecond laser

Our experimental results show that the presence of a proper amount of negative group velocity dispersion is essential to multi-pulse operation of a Kerr-lens mode-locked femtosecond laser. We demonstrate that the pulse separations and the number of pulses contained within a cavity round trip are strongly dependent on the initial perturbations. The results allow us to get a better understanding on the influences of the convoluted self-phase modulation and intra-cavity dispersions on the stable multi-pulse oscillation in a Kerr-lens mode-locked femtosecond laser.     

Propagation of Helmholtz-Gauss beams in weak turbulent atmosphere

Based on the Rytov approximation of light propagation in weak turbulent atmosphere,the closed-form expressions of field and average irradiance of each one of the four fundamental families of Helmholtz-Gauss (HzG)beams:cosine-Gauss beams,stationary Mathieu-Gauss beams,stationary parabolic-Gauss beams,and Bessel-Gauss beams,which are propagating in weak turbulent atmosphere,are obtained.The results show that the field and average irradiance can be written as the product of four factors:complex amplitude depending on the z-coordinate only,a Ganssian beam.a factor of complex phase perturbation induced by atmospheric turbulence,and a complex scaled version of the transverse shape of the non-diffracting beam.The effect of weak atmospheric turbulence on irradiance distribution of the HzG beam can be ignored.     

An effective method for reducing speckle noise in digital holography

An effective method for reducing the speckle noise in digital holography is proposed in this paper.Different from the methods based on classical filtering technique,it utilizes the multiple holograms which are generated by rotating the illuminating light continuously.The intensity images reconstructed by a series of holograms generated by rotating the illuminating light possess different speckle patterns.Hence by properly averaging the reconstructed intensity fields,the speckle noises can be reduced greatly.Experimental results show that the proposed method is simple and effective to reduce speckle noise in digital holography.     

Influence of purity of HfO2 on reflectance of ultraviolet multilayer

The impurities in two kinds of HfO2 materials and in their corresponding single layer thin films were determined through glow discharge mass spectrum technology and secondary ion mass spectrometry(SIMS) equipment respectively.It was found that ZrO2 was the main impurity in the two kinds of HfO2 either in the original HfO2 materials or in the electron beam deposited films.In addition,the difference of Zr content in the two kinds of HfO2 single laver films was much laxger than that of the other impurities such as Ti and Fe.which showed that it was just ZrO2 that made the difference between the optical performance of the film products including the two kinds of HfO2.With these two kinds of HfO2 and the same kind of SiO2.we deposited HfO2/SiO2 multilayer reflective coatings at the wavelength of 266 nm.Experimental results showed that the reflectances of these two mirrors were about 99.85% and 99.15% respectively,which agreed well with the designed results what were based on the optical constants obtained from the corresponding single layer thin films.     

Speech enhancement by array crosstalk resistant ANC and spectrum subtraction

Microphone array-based speech enhancement has great importance for speech communications and speech recognition. To reduce the aperture of the microphone array and to increase the effect of the speech enhancement will greatly broaden the application areas of the microphone array. An array crosstalk resistant adaptive noise cancellation method is therefore presented. And then an improved spectral subtraction algorithm is further cascaded to obtain better enhancement results. Theoretic analysis and experiments indicate that the proposed scheme needs only a very small microphone array while it simultaneously achieves a higher SNR improvement. Besides, the proposed scheme can be used in many noisy environments and is easy for real-time implementation.