镧和铕与邻菲罗啉谷氨酸配合物的NMR和IR研究

合成了稀土镧和铕与谷氨酸，邻菲罗啉形成的二元及三元配合物，经元素分析确定该配合物的组成为Ｌｎ（ｐｈｅｎ）（Ｇｌｕ）３．７Ｈ２Ｏ（Ｌｎ＝Ｌａ，Ｅｕ）；Ｅｕ（Ｇｌｕ）３；１２Ｈ２Ｏ。用核磁共振和红外光谱研究与配体与稀土离子的配位方式，讨论了稀土离子的顺磁性及屏蔽效应对配合物的ＮＭＲ谱图的影响。     

Co(Ⅱ)、Ni(Ⅱ)非有机溶剂液液萃取行为的研究

本文研究了ＰＥＧ２０００铬菁Ｒ（ＮＨ４）２ＳＯ４体系对Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）的非有机溶剂萃取行为。指出在ｐＨ＝５的（ＮａＡｃＨＡｃ）水溶液中，有（ＮＨ４）２ＳＯ４存在下，Ｎｉ（Ⅱ）可被ＰＥＧ相几乎完全萃取，而Ｃｏ（Ⅱ）则基本上不被萃取。从而获得了Ｃｏ（Ⅱ）与Ｎｉ（Ⅱ）混合离子的定量分离。     

钐（Ⅲ）,铽（Ⅲ）与色氨酸和苯丙氨酸配合物的光声光谱研究

合成了Ｌｎ（Ｔｒｐ（３Ｃｌ３．Ｈ２Ｏ和Ｌｎ（Ｐｈｅ）Ｃｌ３．５Ｈ２Ｏ（Ｌｎ＾３＋为Ｓｍ＾３＋，Ｔｂ＾３＋）固体配合物微晶，在３００－７００ｎｍ测定并解释了配合物的光声光谱。从无辐射跃迁角度研究芳香氨基酸固体配合物的能级状况和分子内能量传递过程。结合荧光光谱研究了芳香氨基酸固体配合物的发光特性，并建立了激发驰豫模型。     

G2 PREDICTION OF THE ENTHALPIES OF FORMATION FOR SOME DIATOMIC CATIONS AND NEUTRALS

Ｇ２ＰＲＥＤＩＣＴＩＯＮＯＦＴＨＥＥＮＴＨＡＬＰＩＥＳＯＦＦＯＲＭＡＴＩＯＮＦＯＲＳＯＭＥＤＩＡＴＯＭＩＣＣＡＴＩＯＮＳＡＮＤＮＥＵＴＲＡＬＳＳｕＫｅｈｅＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｃａｌＥｎｇｉｎｅｒｉｎｇ，ＮｏｒｔｈｗｅｓｔｅｒｎＰｏｌｙ...     

硝酸稀土-邻菲罗啉-甘氨酸三元配合物的合成及其表征

合成了ＲＥ（Ｐｈｅｎ）２（Ｇｌｙ）（ＮＯ３）３．３Ｈ２Ｏ（其中ＲＥ＝Ｌａ,Ｃｅ,Ｐｒ,Ｎｄ,Ｇｄ,Ｓｍ,Ｅｒ,Ｙ;Ｐｈｅｎ＝邻菲罗啉;Ｇｌｙ＝甘氨酸）固体配合物,对所合成的配合物进行元素分析、摩尔电导、ＩＲ、ＵＶ、ＴＧ－ＤＴＡ等的分析测试,初步研究了配合物的组成,结构及性质。     

［（μ－CF＿3CO＿2）＿2Ln（μ－CF＿3HCO＿2）Al（i－Bu）＿2·2THFl＿2（Ln＝Nd，Y）配合物的NMR和X－射线衍射研究

对［μ－ＣＦ＿３ＣＯ＿２）＿２Ｌｎ（μ－ＣＦ＿３ＨＣＯ＿２）Ａｌ（ｉ－Ｂｕ）＿２·ＴＨＦｌ＿２（Ｌｎ＝Ｎｄ，Ｙ）配合物单晶结构的Ｘ－射线分析指出，配合物具有中心对称性，配位中心由两个稀土和两个Ａｌ离子组成，稀土由两个ＴＨＦ和６个ＴＦＡ分子配位形成畸变的三盖三棱柱结构，Ａｌ由两个ＴＦＡＧ和两个ｉ－Ｂｕ配位形成四面体结构。桥连Ａｌ与两个稀土的ＴＦＡ分子的羧基发生歧化加氢，其碳原子由ＳＰ￣２型转变为ＳＰ￣３型．ＮＭＲ研究表明，在ＴＨＦ溶液中，该配合物保持了它在单晶中的配位结构，所不同的是两个ｉ－Ｂｕ在溶液中有两种异构形成，二者间为慢交换过程。     

三氯化二甘氨酸四水合稀土固体配合物的合成及红外光谱研究

在水溶液中制备出配合物［Ｌｎ（Ｇｌｙ）２．４Ｈ２Ｏ］．Ｃｌ３．ｎＨ２Ｏ（Ｌｎ＝Ｇ，Ｅｒ，Ｙｂ），测定了配合物的红外光谱，并对其主要红外吸收带进行了归属。结果表明，甘氨酸以内盐的形式存在于配合物中，并通过羧基与稀土离子配位。四个水分子参与了配位，在Ｇｄ和Ｅｒ的配合物还有一个不分子未参与配位。推测Ｙｂ配合物为对称的一维无限长链结构，其余两种配合物为不对称的一维无限长链。     

核磁共振波谱研究氟化膦配体及其金属配合物的氟谱化学位移

研究了氟化膦类系列配位体（ＧＰＦ２：Ｇ＝Ｆ，Ｅｔ２Ｎ，Ｍｅ２Ｎ，Ｃ５Ｈ１０Ｎ，ｎＰｒＯ，ＰｈＯ，ｎｅｏＰｎＯ，２，５ｄｉＭｅＰｈ，ｉｓｏＰｒ，ｅｔｃ．）及其与金属镍（０）铜（Ｉ）钼（０）金（Ｉ）形成的配合物的核磁共振氟谱化学位移的定量分子建模，发现了其中的一些有用规律．     

晶体Sr_2Cu（HCOO）_6·8H_2O作为先驱物制备Sr_2CuO_2（C

应用ＳｒＣＯ３和ＣＵ（ＮＯ３）·３Ｈ２Ｏ从甲酸溶液中制备出晶体Ｓｒ２Ｃｕ（ＨＣＯＯ）６·８Ｈ２Ｏ，用这一晶体作为先驱物，石英管式炉中，８２５℃烧结六小时，得到单相的Ｓｒ２ＣｕＯ２（ＣＯ３）．通Ｎ２气体，８５０℃烧结十小时，得到Ｓｒ２ＣｕＯ３．Ｓｒ２ＣｕＯ２（ＣＯ３）是形成Ｓｒ２ＣｕＯ３的一种中间相．     

Fe（Ⅲ）、Al（Ⅲ）、Ni（Ⅱ）非有机溶剂液－液萃取行为的研究

本文研究了ＰＥＧ（聚乙二醇）－２０００－钍试剂－（ＮＨ＿４）＿２ＳＯ＿４体系对Ｆｅ（Ⅲ）、Ａｌ（Ⅲ）、Ｎｉ（Ⅱ）的非有机溶剂萃取行为。指出在ｐＨ为３．５－６．５（ＮａＡｃ－ＨＡｃ）的水溶液中，有（ＮＨ＿４）＿２ＳＯ＿４存在下，Ｆｅ（Ⅲ）、Ａｌ（Ⅲ）可被ＰＥＧ－２０００相几乎完全萃取，而Ｎｉ（Ⅱ）则基本上不被萃取。从而获得了Ｎｉ（Ⅱ）与Ｆｅ（Ⅲ）、Ａｌ（Ⅲ）混合离子的定量分离。     

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.