DBC-偶氮胂光度法测定人发中微量铋

ＤＢＣ－偶氮胂对铋的灵敏度较高且选择性好，在０．２－１．０ｍｏｌ／Ｌ硝酸介质中与Ｂｉ形成配位比为１：２的紫红色配合物，λｍａｘ＝６３０ｎｍ，ε６３０＝８．８×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。铋量在０－＝１０μｇ／１０ｍＬ范围内符合比耳定律。用于人发中微量的铋的测定，操作简便，结果满意。     

银—2—羧基—4—溴苯基重氮氨基偶氮苯—TritonX—100—SDS显色体系的研究及应用

新三氮烯类试剂之一，２－羧基－４－溴苯基重氮氨基偶氮苯，在ｐＨ１１．０的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲介质中，有非离子表面活性剂ＴｒｉｔｏｎＸ－１００及阴离子表成活性剂ＳＤＳ的共同存在下，可与Ａｇ（Ｉ）生成稳定性的２：１红色配合物，红色配合物的λｍａｘ＝５４０ｎｍ表观摩尔吸光系数ε＝５４０＝１．１０×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ａｇ量在０－１０μｇ／２０ｍＬ符合比尔定律，方法用于工业废水中     

铁(Ⅱ)-邻二氮菲逐级配合物的摩尔吸光系数的研究

本文用分光光度法测定铁（Ⅱ）－邻二氮菲溶液配合物各级摩尔吸光系数Δε１＝９．０３×１０＾３Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,Δε２＝１．０３×１０＾４Ｌ·ｍｏｌ＾－１,其各级摩尔吸光系数的实验值Δε实验吻合较好,验证了结果的可靠性。     

新型显色剂2-(H-酸偶氮)-4,5-二硝基苯酚测定铁(Ⅲ)

本文研究了新试剂２－（Ｈ－酸偶氮）－４,５－二硝基苯酚与铁的显色反应,在ＰＨ５．３的ＮａＡｃ－ＨＡｃ缓冲介质中,ＨＡＤＮＰ与Ｆｅ（Ⅲ）生成３：１稳定紫色配合物,λｍａｘ＝５９０ｎｍ,ε＝１．７０＊１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,铁含量在０－１．０ｍｇ／Ｌ范围内符合比耳定律,该法用于自来水样中总铁的测定,结果令人满意。     

5—溴水杨基荧光酮—溴化十六烷基三甲铵荧光熄灭法测定微量？…

本文报道了在溴化十六烷基三甲铵（ＣＴＭＡＢ）存在下,以５－溴水杨基荧光酮（５－ＢrＳＡＦ）作为荧光试剂,用荧光熄灭法测定微量钼的新方法。详细研究了各种条件实验。 反应了适宜酸度范围为０．０８－０．２４ｍｏｌ．Ｌ＾－１ＨＣ１,钼含量在０－４．０ｕｇ／２５ｍＬ范围内呈线性关系,配合物的组成比为Ｍo（Ⅳ）：５－ＢrＳＡＦ：ＣＴＭＡＢ＝１：２：２,激发波长为３６５ｎｍ,发射波长为５２５ｎｍ。方法灵敏度高,检出     

PF和吐温—80分光光度法测定铝的研究与应用

本文研究了氨性缓冲溶液中，在吐温－８０－存在下，铝与苯基荧光酮的显色反应，配合物的最大吸收波长为５５６ｎｍ，表观摩尔吸光系数为１．２×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，有色配合物配合比为Ａｌ；ＰＦ＝１：２铝量在０－５μｇ／２５ｍＬ范围内符合经耳定律。方法具有较高的灵敏度、操作简便，迅速，测定水中微量铝，结果满意。     

P538萃取锰（Ⅱ）的研究

在２５±０．５℃，用Ｐ５３８的环己烷溶液从ＮａＣｌＯ４－ＨＣｌＯ４介质中萃取Ｍｎ（Ⅱ）的反应机理为离子交换机理，萃取焓△Ｈ＝－１９６ｋＪ．ｍｏｌ＾－１并用Ｃｌ＾－离子水合作用和Ｍｎ＾２＋与Ｃｌ＾－形成配合物的竞争解释了萃取分配比与水相中ＮａＣｌ浓度的关系。     

痕量钼的在线离子交换预浓缩流动注射—电感耦合等离子体光谱测定

本文采用双柱在线离子交换预浓缩ＦＩＡ－ＩＣＰ系统，建立了水及土壤浸出液中痕量钼的测定方法。用内装Ｄｏｗｅｘｌ（Ｃｌ＾－１型）阴离子交换树脂微型柱吸附待测元素，然后用洗脱剂（１．９ｍｏｌ／Ｌ氯化铵－０．４ｍｏｌ／Ｌ柠檬酸铵混合液＾［５］）洗脱。在采样频率为１２样／小时的速度下，浓缩倍数可达５０倍。样品（自来水）回收率为９０－１１０％；在０．２μｇ／ｍｌ水平时，变异系数为５．３％（ｎ＝１１）。     

新试剂N—壬基—N‘—（氨基对苯磺酸钠）硫脲（NPT）与钯（Ⅱ）显色？…

研究新合成的水溶性光度试剂Ｎ－壬基－Ｎ‘－（氨基对苯磺酸钠）硫脲与钯的显色反应。结果表明，在ｐＨ５．８－６．６的ＨＡｃ－ＮａＡｃ缓冲体系中，Ｐｄ＾２＋与ＮＴＰ形成１：４的黄色水溶性配合后物，ＣＴＭＡＢ对反应有明显的增敏作用，配合物的最大吸收波长位于２９７．６ｎｍ，表面摩尔吸光系数ε２９７．６＝１．２７×１０＾５Ｌ．ｍｏｌ＾－１ｃｍ＾－１，钯含量在２－１１．２μｇ／２５ｍＬ范围内服从比尔定律，５０种     

稀土（La^3＋,Pr^3＋）—DBS—偶氮胂有色配合物组合和稳定常数的吸收光谱法测定

稀土（Ｌａ＾３＋,Ｐｒ＾３＋）在酸性条件下与ＤＢＳ－偶氮胂发生配位反应,首先对光谱数据进行因子分析法处理从而判断出只生成一类配合物,进而采用线性回归法计算配合物组成,摩尔吸光系数,表观稳定常数及配位体浓度,实验结果表明,在１ｍｏｌ．Ｌ＾－１ＨＣｌ介质中,Ｌａ＾３＋、Ｐｒ＾３＋与ＤＢＳ－偶氮胂形成Ｍ：Ｌ＝１：３的配合物,其摩尔吸光系数分别为１．３９９＊１０＾５和１．１５１７＊１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,表观稳定常数ｌｏｇβ３分别为１５．３６和１５．３４。     

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.