5-(4-氯苯基偶氮)-8-苯磺酰氨基喹啉分光光度法测定微量镍(Ⅱ)

在 p H10 .5的 Na2 B4O7- Na OH介质及 CS(NH2 ) 2 、氯化十六烷基吡啶 (CPC)存在时 ,室温下镍 ( )与5 - (4 -氯苯基偶氮 ) - 8-苯磺酰氨基喹啉 (CPBSQ)反应 ,生成络合比为 1∶ 4的有色络合物 ,其最大吸收波长位于 6 0 0 nm。研究了反应的最佳条件 ,建立了一个测定 Ni( )的光度分析新方法。 Ni( )的浓度在 0—10 .0 μg/2 5 m L范围内符合比耳定律 ,其摩尔吸光系数为 1.93× 10 5L· mol-1·cm-1。考察了 2 0多种共存离子的影响 ,大多数常见离子在氨水沉淀分离后不干扰测定。方法用于合金钢中镍的测定 ,其相对标准偏差为 1.9%— 2 .1% ,标准加入回收率为 97%— 10 4 %。     

新显色剂2-羟基-3-磺酸基-5-硝基苯基重氮氨基偶氮苯与汞的显色反应研究

非离子表面活性剂TritonX-100存在下,测定了新显色剂2-羟基-3-磺酸基-5-硝基苯基重氮氨基偶氮苯(HSNDAA)与Hg()的显色反应条件。发现在pH11.3的Na2B4O7-NaOH缓冲介质中,试剂可与Hg()形成一种稳定的2∶1红色络合物,其最大吸收波长位于520nm处,Hg()质量浓度在0—0.5μg/mL范围内符合比耳定律,表观摩尔吸光系数为:3.3×105L·mol-1·cm-1。本法用于环境水样中汞的测定,结果令人满意。     

2-羟基-5-磺酸基苯基重氮氨基偶氮苯分光光度法测定痕量汞(Ⅱ)

研究了 2 羟基 5 磺酸基苯基重氮氨基偶氮苯 (HSDAA)与汞 (Ⅱ )的显色反应。在TritonX 10 0存在下 ,于pH 10 30的硼砂 氢氧化钠缓冲溶液中 ,汞 (Ⅱ )与试剂形成 1∶2的稳定橙红色配合物 ,其最大吸收波长位于 5 19nm处 ,表观摩尔吸光系数为 1 6 7× 10 5L·mol- 1 ·cm- 1 。汞 (Ⅱ )在 0～ 6 0 0 μg·L- 1 之间符合朗伯 比尔定律。该法直接应用于水样中痕量汞的测定。     

1-偶氮苯-3-(5-氯-2-吡啶)-三氮烯的合成及与锌的显色反应

合成了新显色剂1-偶氮苯-3-(5-氯-2-吡啶)-三氮烯.在表面活性剂OP存在下,pH为10.5-11.5的Na2B4O7-NaOH缓冲溶液中,新显色剂1-偶氮苯-3-(5-氯-2-吡啶)-三氮烯与锌发生显色反应,生成4∶1的红色配合物.配合物的最大吸收峰位于530nm,表观摩尔吸光系数为1.25×105L·mol-1·cm-1,Zn2 浓度在0-480μg/L范围内遵守比耳定律.测定废水中微量锌,结果令人满意.     

2-(2-喹啉偶氮)-4-甲基-1,3-二羟基苯分光光度法测定钒

在 p H为 3.5的柠檬酸 -氢氧化钠缓冲介质中 ,溴化十六烷基三甲基铵 (CTMAB)存在下 ,新试剂 2 -(2 -喹啉偶氮 ) - 4-甲基 - 1,3-二羟基苯 (QAMDHB)与钒发生显色反应 ,生成 2∶ 1稳定络合物 ,最大吸收波长为 5 5 2 nm,摩尔吸光系数 ε=8.0 5× 10 4L· mol-1· cm-1,钒含量在 0— 0 .6 μg/ m L内符合比耳定律。用于几种合金样品中钒的分析 ,结果令人满意。     

邻羟基苯基重氮氨基偶氮苯的合成及与镉的显色反应

报道了邻羟基苯基重氮氨基偶氮苯(o-HDAA)的合成及其与镉的显色反应.在Triton X-100存在下,pH10的Na2B4O7-NaOH缓冲溶液中,该试剂与Cd(Ⅱ)形成3:1稳定的红色络合物,其最大吸收波长为516nm,表观摩尔吸光系数为1.88×105L·mol-1·cm-1,Cd(Ⅱ)浓度在0-20.0μg/25mL符合朗伯-比耳定律.用拟定方法测定废水中微量镉,结果令人满意.     

4-甲氧基-2-磺酸基苯基重氮氨基偶氮苯的合成及其与汞（Ⅱ）的显色反应

合成了4-甲氧基-2-磺酸基苯基重氮氨基偶氮苯(MOSDAA),并对该试剂与汞(Ⅱ)的显色反应进行了研究.实验表明,在pH 11.5的Na2B4O7-NaOH缓冲溶液中,Triton X-100存在下,该试剂与汞(Ⅱ)形成3:1的红色络合物,其最大吸收波长位于520nm,表观摩尔吸光系数为2.56×105L·mol-1·cm-1,Hg(Ⅱ)在0-14μg/25mL范围内遵守比耳定律.     

对磺酰胺基苯基重氮氨基偶氮苯的合成及其与镉显色反应的研究

报道了新显色剂对磺酰胺基苯基重氮氨基偶氮苯的合成及其与镉的显色反应。在非离子表面剂活性剂 OP存在下 ,于 p H11.2 6的 NH4Cl- NH3 · H2 O缓冲溶液中 ,新试剂与镉生成 3∶ 1的稳定络合物 ,最大吸收波长在 5 10 nm处 ,表观摩尔吸光系数 ε=1.2 3× 10 5L·mol-1·cm-1。镉量在 0— 10 .6 7μg/ 2 5 m L范围内遵守比耳定律。本法用于测定工业废水中微量镉 ,结果令人满意     

高效液相色谱法测定2-苯基-4-对甲苯基-1,5-苯并硫氮杂-α-(丁二酰亚胺基)-β-内酰胺

本文采用 Hypersil- ODS2 (4 .6mm× 2 5 0 mm,5μm)色谱柱 ,乙腈 -水 (70∶ 30 )流动相 ,2 4 2 nm测定波长 ,建立了测定 2 -苯基 4 -对甲苯基 - 1,5 -苯并硫氮杂 艹卓 -α- (丁二酰亚胺基 ) -β-内酰胺高效液相色谱法。该法线性范围为 0— 0 .1mg/ m L,回归方程 A=2 .11× 10 8C- 3.10× 10 5,相关系数 r=0 .9995 ,相对标准偏差为0 .2 4 % (C=0 .0 6mg/ m L,n=5 ) ,检出限为 0 .0 5 μg/ m L。平均回收率在 97.1%— 10 2 .4 %之间。该法重现性好、灵敏度高、简单、快速、准确     

新试剂4,4′-二（4-苯偶氮苯氨基重氮基）二苯醚与镉（Ⅱ）的显色反应

研究了新显色剂4,4′-二（4-苯偶氮苯氨基重氮基）二苯醚（PPDPE）与镉（）的显色反应。在Triton X-100存在下,于pH10.22的硼砂-氢氧化钠缓冲溶液中,镉（）与4,4′-二（4-苯偶氮苯氨基重氮基）二苯醚形成摩尔比1∶2的红色络合物,试剂及络合物的最大吸收波长分别为400nm和530nm,表观摩尔吸光系数为2.05×105L.mol-1.cm-1,镉（）含量在0—10.0μg/25mL范围内符合比耳定律。方法用于废水中镉的测定,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.