二安替比林对碘苯基甲烷与铬(Ⅵ)显色光度法研究

本文研究了在 Mn( )存在下新试剂二安替比林对碘苯基甲烷 (DAp IM)与 Cr( )反应生成桔红色配合物 ,λmax为 4 88nm,表观摩尔吸收系数 ε=2 .0 5× 10 5L.mol-1.cm-1,Cr( )含量在 0— 8.0 μg/ 2 5 m L范围内符合比耳定律 ,线性回归方程为 A=0 .0 2 65 +0 .141C(μg/ 2 5 m L) ,r=0 .9974 ,方法用于电镀废水中铬的测定 ,结果令人满意     

二苯卡巴腙分光光度法测定水和钢中Cr(Ⅵ)

Cr(Ⅵ)与二苯卡巴腙的快速显色反应,生成一种紫红色配合物,其表观摩尔吸收系数为6.7×104L·mol-1·cm-1,有色合物λmax=545nm,铬在0.01-2.5μg/mL符合比耳定律.据此建立了二苯卡巴腙分光光度法测定水和钢中Cr(Ⅵ)方法,该方法选择性好,操作简单,快速准确,适宜于水样及钢中微量铬(Ⅵ)的检测.     

萃取光度法测定高纯氧化钐中的铬

本文研究了正戊醇－高氯酸－Cr(Ⅵ）－二苯碳酰二肼体系的各种萃取条件,建立了萃取光度法测定微量铬的新方法。在高氯酸介质中,正戊醇能定量的萃取富集Cr(Ⅵ）－二苯碳酰二肼络合物。萃取前和萃取后络合物的最大吸收波长不变（543nm）,而试剂空白在此处均无吸收。校准曲线在0－5μg/mL范围内符合比耳定律。利用EDTA掩蔽稀土基体的干扰,用本法制定了高纯稀土氧经物中的铬含量,并作了加标回收实验结果令人满意。     

火焰原子吸收光谱法测定饲料中钙

建立了直接利用测定饲料中磷的样品分解液 ,采用火焰原子吸收分光光度法测定饲料中钙的分析方法。在吸收波长 4 2 2 .7nm处 ,Ca2 + 在 0— 15μg/ m L范围内符合比耳定律 ,回归方程为 A=0 .0 6 44C+0 .0 0 6 3,相关系数 r=0 .9996 ;以 3SA/ S计 ,检出限为 0 .0 5μg/ m L;RSD<3%。加标回收率在 98%— 111%之间 ,应用统计学 F检验法验证方法准确度 ,表明本法和国标法相比无显著差异。方法用于饲料中钙的测定 ,简便、快捷、准确。     

微波消解-火焰原子吸收光谱法测定四大怀药中的Fe和Zn

探讨了测定四大怀药中微量元素铁和锌的新方法.用高压密闭微波消解-火焰原子吸收法测定四大怀药——怀山药、怀菊花、怀地黄、怀牛膝等怀药中微量元素Fe和Zn的含量.铁的回归方程为y=0.0968x+0.0114,r=0.9995(n=6),线性范围0-6.4μg/mL,平均回收率91.29％-101.06％,RSD为1.334％-4.314％.样品铁含量为159.091-1535.64μg/g.锌的回归方程为y=0.4207x+0.0039,r=0.9996(n=6),线性范围0-1.2μg/mL,平均回收率93.58％-100.85％,RSD为1.145％-3.634％.样品锌含量43.571-70.357μg/g.微波消解法消解样品,具有省时、简便、经济、消解完全、污染少等特点,可用于怀药微量元素的测定.     

Fe(Ⅲ)-磺基水杨酸褪色光度法测定物样品中的硫普罗宁

建立了Fe(Ⅲ)-磺基水杨酸褪色光度法测定硫普罗宁的新方法.结果表明,在酸性介质中,硫普罗宁分子中的巯基(—SH)可将Fe3+还原为Fe2+,采用磺基水杨酸作为Fe3+的显色剂,借褪色分光光度法间接测定了硫普罗宁含量.显色体系最大吸收波长为480nm,硫普罗宁在0.50-4.0μg/mL浓度范围内与AA呈良好的线性关系,线性回归方程为△A=0.0065+ 13C(μg/mL),线性相关系数r=0.9997,检出限为0.00016μg/mL.方法成功用于实际药品中硫普罗宁的含量测定.     

钌(Ⅲ)-高碘酸钾-二安替比林苯基甲烷新体系催化光度法测定痕量钌的研究

本文发现了钌(Ⅲ)对KIO4氧化二安替比林苯基甲烷(DAPM)的增色反应有显著的催化作用,由此建立了测定痕量钌的催化分光光度分析法,并且测定了一些动力学参数.方法的线性范围为2.0-14.0μg/L,检出限为2.0×10-9g/mL,用于岩矿中痕量钌的测定,其结果令人满意.     

反相高效液相色谱法同时测定二色补血草茎中芦丁和槲皮素的含量

采用RP-HPLC法同时测定二色补血草茎中芦丁和槲皮素的含量.以Hypersil ODS2色谱柱(4.6mm×250mm,5μm),柱温为室温,以CH3OH-0.5% H3PO4为流动相,流速1mL/min,检测波长为355nm,测定二色补血草茎中芦丁和槲皮素的含量.芦丁在0.12-1.20μg、槲皮素在0.04-0.40μg范围内呈良好的线性关系,相关系数分别为0.9999和0.9997,芦丁回收率为101.42%,RSD为0.98%,槲皮素回收率为102.85%,RSD为1.32%.该方法操作简单,线性关系好.     

浊点萃取-石墨炉原子吸收光谱法测定药物胶囊中的痕量铬（Ⅵ）

采用硝基苯胲铵盐（铜铁试剂）、吡咯烷基二硫代甲酸铵（APDC）为络合剂,Triton X-114为表面活性剂的浊点萃取体系分别富集药物胶囊中的痕量Cr（Ⅲ）和总铬,富集后的Cr（Ⅲ）和总铬用石墨炉原子吸收光谱法进行测定.讨论了溶液pH值、表面活性剂浓度、络合剂浓度、平衡温度、平衡时间等对浊点萃取效率的影响.在优化的实验条件下,铬（Ⅵ）的检出限为0.031μg/L,相对标准偏差为1.2％（C=2.0μg/L,n=6）,加标回收率为98.4％-102.1％.应用该法测定药物胶囊中的痕量Cr（Ⅵ）,结果令人满意.     

铬渣中铬,镍,锌,锰和铁的X射线荧光法测定

本文首次研究了用X射线荧光光谱法测定铬渣中Cr、Zn、Ni、Mn和Fe元素的模拟标样,样品直接压片不经化学处理。用稀释样品校正试样的基体效应。用人工模拟标样所建立的元素浓度与X射线强度间的线性函数关系令人满意,所试元素的线性相关系数均在0.99以上,测定结果与化学法基本一致。Cr的检测下限为0.036%;Fe为0.039%;Ni为35.33μg/g;Mn为498.18μg/g;Zn为55.61μg/g。各元素的相对标准偏差均低于2.48%。并首次用非线性方法研究了铬渣样品稀释比中Cr、Ni、Zn、Mn、Fe与X射线强度的线性关系。     

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.