新试剂2-(4-安替比林偶氮)-5-二乙氨基苯胺与钯显色反应的研究及应用

在ｐＨ＝５．０ＨＡｃ－ＮａＡｃ缓冲介质中,吐温－８０存在下,２－（４－安替比林偶氮）－５－二乙氨基苯胺（ＡＤＥＡ）与钯生成２∶１红色络合物,λｍａｘ＝５３０ｎｍ,ε＝６．１５×１０４Ｌ·ｍｏｌ－１·ｃｍ－１,钯的含量在０—２０μｇ／２５ｍＬ内符合比耳定律,本方法用于钯催化剂中痕量钯的测定,结果令人满意。     

分光光度法测定烟叶中镁的研究

在ｐＨ＝ ７．０ ＮＨ４Ａｃ 缓冲介质中,苦氨酸偶氮－Ｈ－酸（ＰＨＡ）与镁反应生成２∶１ 蓝紫色络合物,λｍ ａｘ＝６３０ｎｍ ,ε＝ １．１６×１０４Ｌ·ｍ ｏｌ－ １·ｃｍ － １,镁的含量在０．５－ ４０μｇ／２５ｍ Ｌ内符合比尔定律,本方法用于烟草样品中镁的测定,结果令人满意。     

铂(Ⅳ)-钼酸盐-乙基罗丹明B离子缔合显色反应研究

本文研究了在聚乙烯醇（ＰＶＡ）存在下用钼酸盐与乙基罗丹明Ｂ（ＥＲＢ）形成离子缔合物，该缔合物的最大吸收位于５８０ｎｍ，摩尔吸光系数为１．１２×１０６Ｌ·ｍｏｌ－１·ｃｍ－１，服从比耳定律范围０—２．５μｇ／２５ｍＬ，缔合物至少稳定１周，考察了５０多种共存离子的影响，除生成杂多酸元素和Ａｕ（Ⅲ）、Ｏｓ（Ⅷ）、Ｐｄ（Ⅱ）、Ｉｒ（Ⅳ）外，大多数元素不干扰。测定铂的条件为：〔ＨＣｌＯ４〕＝１．２ｍｏｌ／Ｌ，〔ＭｏＯ４２－〕＝９．１×１０－４ｍｏｌ／Ｌ，〔ＥＲＢ〕＝３．２×１０－５ｍｏｌ／Ｌ，０．０８％ＰＶＡ。缔合物的摩尔比为Ｐｔ（Ⅳ）∶ＥＲＢ＝１∶２，本法已用于铂矿中铂的测定，结果满意。     

双显色剂协同显色光度法测定锡

在ｐＨ ５．０ 的ＮａＡｃ－ＨＡｃ缓冲溶液中, ＰＶＡ 存在时, 锡和邻苯二酚紫（ＰＶ） 与罗丹明Ｂ（ＲｈＢ） 生成离子缔合物, 其组成为Ｓｎ∶ＰＶ∶ＲｈＢ＝ １∶２∶４。缔合物最大吸收波长为５６０ ｎｍ , 表观摩尔吸光系数ε＝１．１８×１０５ Ｌ·ｍ ｏｌ－ １ ·ｃｍ － １ 。锡量在０～１５ μｇ／２５ｍ Ｌ范围内符合比耳定律。拟定方法已用于某些样品中微量锡的测定, 结果满意。     

二安替比林邻甲氧基苯基甲烷与锰显色反应的研究应用

在碱性介质中,空气氧化Ｍｎ（Ⅱ）为Ｍｎ（Ⅳ）,然后在酸性介质中,Ｍｎ（Ⅳ）氧化二安替比林邻甲氧基苯基甲烷（ＤＡｏＭＭ）生成橙色产物,λｍａｘ＝４８０ｎｍ,ε＝３．２４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１,锰含量在０—４０μｇ／２５ｍＬ内符合比耳定律,方法用于茶叶中锰的测定,结果满意。     

银－2－羧基－4－溴苯基重氮氨基偶氮苯－Triton X－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Ｎａ_２Ｂ_４Ｏ_７－ＮａＯＨ缓冲介质中，有非离子表面活性剂ＴｒｉｔｏｎＸ－１００及阴离子表面活性剂ＳＤＳ的共同存在下，可与Ａｇ（Ⅰ）生成稳定的２∶１红色配合物，红色配合物的λ_（ｍａｘ）＝５４０ｎｍ，表观摩尔吸光系数ε_（５４０）＝１．１０×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。Ａｇ量在０－１０μｇ／２５ｍＬ符合比尔定律。方法用于工业废水中痕量Ａｇ的测定，结果满意。     

二磺基苯基荧光酮光度法测定铝的研究和应用

研究了二磺基苯基荧光酮（ＤＳＦＦ）与铝的显色反应,在ＰＨ＝４．６ＨＡｃ－ＮａＡｃ缓部介质中,非离子型微乳液存在下,ＤＳＦＦ和Ａｌ（Ⅲ）生成２：１紫色络合物,λｍａｘ＝６１０ｎｍ,ε＝１．４３×１０＾５Ｌ·ｍｏｌ·ｃｍ＾－１。方法用于环境水样中铝的测定,结果满意。     

新试剂2—（4—安替比林偶氮）—5—二乙氨基本胺与钯显色反应的研究及应用

在ｐＨ＝５．０ＨＡｃ－ＮａＡｃ缓冲介质中,吐温－８０存在下,２－（４－安替比林偶氮）－５－二乙氨基苯胺（ＡＤＥＡ）与钯生成２：１红色络合物,λｍａｘ＝５３０ｎｍ,δ－６．１５×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,钯的含量在０－２０μｇ／２５ｍＬ内符合比耳定律,本方法用于钯催化剂中痕量钯的测定,结果令人满意。     

苯基荧光酮在混合表面活性剂体系中铜、铝的分光光度法同时测定

本文对在溴代十六烷基三甲铵和吐温８０混合表面活性剂中苯基荧光酮分光光度法同时测定铜和铝进行了研究。实验表明，在磷酸介质中，ｐＨ＝６．８－７．４范围内，苯基荧光酮与铜、铝形成稳定的络合物。铜络合物最大吸收波长为６００ｎｍ，εＣｕ６００＝６．６３×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，线性范围为０—５μｇ／２５ｍＬ；铝络合物最大吸收波长为５６４ｎｍ，εＡｌ５６４＝１．０１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，线性范围０—６μｇ／２５ｍＬ。方法灵敏度高，选择性好，用于水及健康人体冻干血浆中铜、铝回收率的测定，结果满意。     

新试剂N-已基-N′-(氨基对苯磺酸钠)硫脲(HXPT)的合成及其测定微量钯的研究

合成了新试剂Ｎ－已基－Ｎ′－（对苯磺酸钠）硫脲（ＨＸＰＴ）并确定了其结构。研究了它与钯（Ⅱ）反应的条件试验,结果表明,在ｐＨ ５．４～５．８ 的ＨＡｃ－ＮａＡｃ介质中,有溴化十六烷基三甲胺（ＣＴＭＡＢ）的存在,试剂与钯（Ⅱ）形成稳定的黄色配合物,最大吸收波长为２９６．８ ｎｍ ,表观摩尔吸光系数为２．２１×１０５ Ｌ·ｍ ｏｌ－ １ ·ｃｍ － １,钯浓度在１～７ μｇ·２５ ｍ Ｌ－ １ 范围内,符合比尔定律。方法简便、快速、选择性好,用于催化剂、矿样中微量钯的测定,结果满意。     

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.