二安替比林—（邻—乙氧基）苯基甲烷褪色光度法测定微量铜的研究

合成了新试剂二安替比林－（邻－乙氧基）苯基甲烷（ＤＡｏＥＭ），根据Ｃｕ＾２＋对Ｈ３ＰＯ４－Ｍｎ（Ⅱ）－Ｃｒ（Ⅵ）－ＤＡｏＥＭ显色体系的干扰褪色作用，建立了一个测定微量铜的新方法，其检出限为４×１０＾－６ｇ／Ｌ，铜离子含量在２０－１６０μｇ／Ｌ范围内与１ｇ（Ａ０／Ａ）成良好线性关系，体系稳定性和选择性良好，用于铅样中痕量铜的测定，结果满意。     

岩石中稀土元素的分离富集及荧光X－射线光谱法测定

文中用合成的偶氮氯磷－ｍＡ螯合形成纤维（以下称ＣＰＡ－ｍＡ纤维）对地质样品中的稀土元素进行分离富集，并制成薄试样进行荧光Ｘ－射线光谱法测定［１，２］。ＣＰＡ－ｍＡ纤维合成简单，交换速度快，在抗坏血酸和混合掩蔽剂（ＥＤＴＡ＋ＣＹＤＴ＋ＥＧＴＡ）存在下使痕量稀土元素及基体分离并得以富集。分析结果表明该方法的ＲＳＤ小于１５．６８％，标准加入回收率在８４．０～１０７．５％之间，能较好地满足地质工作的需要。     

巯基棉分离富集原子吸收光谱法测定铜精矿中金银

本文详细地研究了在ＨＣｌ介质中,巯基棉分离富集Ａｕ,Ａｇ,ＫＩＯ３－ＨＣｌ解脱Ａｕ,原子吸收分光光度法测定金、银的方法。本方法一次溶样连续测定Ａｕ,Ａｇ,简便快速,分析结果可靠,在Ａｕ３２μｇ,Ａｇ４００μｇ范围内,Ａｕ回收率９８．８％－１０１．２％,ＲＳＤ为３％,Ａｇ回收率９７．３％￣１０１．３％,ＲＳＤ为２％。     

流动注射在线液-液萃取FAAS法测定地表水中痕量铜

研讨了流动注射在线液－液萃取火焰原子吸收光谱法测定地表水中痕量铜的分析方法。采用ＡＰＤＣ为螯合剂,ＭＩＢＫ在线萃取后注入原子吸收光谱仪测定,其相对标准偏差（ＲＳＤ）为３．５％;检出限（３σ）为９．１１＊１０＾－２μｇ．Ｌ＾－１,加标回收率为９５％－１０３％。     

巯基棉分离富集-FAAS法测定爆玉米花中痕量铅

本文借助巯基棉分离富集技术,以火焰原子吸收光谱法（ＦＡＡＳ）测定爆玉米花中痕量铅。该方法采用巯基棉做分离富集剂,简便易行,并能有效的消除共存元素的干扰,回收率为９７．５％－１０６．０％。     

EDTA—纤维微柱同时富集多种痕量元素以及电感耦合等离子体…

制备了ＥＤＴＡ－纤维滤纸片，以此做为微柱填充同时富集Ｆｅ，Ｃｕ，Ｚｎ，Ｖ，Ｐｂ，Ｃｄ，Ｃｏ和Ｎｉ等离子，结合电耦合等离子体发射光谱法（ＩＣＰ－ＡＥＳ）测定，回收率为９２～１０６％。本法富集倍数为１００以上。     

Cu^2＋与胆固醇相互作用的光谱分析研究

以分光光度法（ＳＡ），原子吸收光谱分析（ＡＡＳ）、电感耦合等离子体原子发射光谱法（ＩＣＰ－ＡＥＳ）以及红外光谱分析（ＩＲ）考察了水溶液中Ｃｕ＾２＋与胆固醇的要艇。不同分析方法均得出相同结果，Ｃｕ＾２＋与胆固醇二者间存在表面吸附作用，这种作用在近生理条件下较为显著。     

EDTA-纤维微柱同时富集多种痕量元素以及电感耦合等离子体发射光谱法测定

制备了ＥＤＴＡ－纤维滤纸片，以此做为微柱填充物同时富集Ｆｅ、Ｃｕ、Ｚｎ、Ｖ、Ｐｂ、Ｃｄ、Ｃｏ和Ｎｉ等离子，结合电感耦合等离子体发射光谱法（ＩＣＰ－ＡＥＳ）测定。回收率为９２～１０６％。本法富集倍数为１００以上     

析相光度法测定铜（Ⅱ）的研究

本文研究了Ｃｕ－ＰＥＧ－ＤＤＴＣ（铜试剂）（ＮＨ４）２ＳＯ４体系的析相光度法并应用于测定Ｃｕ。最宜酸度为３．６－９．０（ＮａＡｃ－ＨＡｃ，ＮＨ４Ｃｌ－ＮＨ３．Ｈ２Ｏ）缓冲溶液，其络合物的最大吸收位于４５０ｎｍ，表观摩尔吸光系数为９．０５×１０＾３Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ｃｕ浓度在０－３０μｇ／Ｌ范围内服从比耳定律，铜与ＤＤＴＣ形成组成为１：２的稳定络合物。该方法用于铝合金中铜的测定，获得了满     

膜富集分光光度法测定痕量铜的研究

本文以ＰＡＮ为显色剂，用ＷＸ型混合纤维素滤膜（孔径为０．６５μｍ，２５ｍｍ）富集分离，用乙醇溶解富集物Ｃｕ－ＰＡＮ，分光光度法测定微量铜，Ｃｕ－ＰＡＮ在乙醇溶液中最大吸收波长为５６０ｎｍ，表观摩尔吸光系数为３．７３×１０－４Ｌ·ｍｏｌ－１·ｃｍ－１。铜量在０．２－１０．０μｇ／５ｍＬ范围内符合比耳定律，该法具有灵敏度高、操作简便、快速、线性范围宽等优点。方法应用于食品、水样中铜的测定，结果满意     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Research on beamforming method for dual-line array with space mismatch between the two line arrays

The performance of port/starboard discrimination of dual-line array will be seriously degraded when the space between the two line arrays of the dual-line array is mismatched. The directivity function of the delay-sum and delay-subtract beamforming is deduced and the port/starboard discrimination of the delay-sum and delay-subtract beamforming is also studied both under the ideal status and the status under which the space between the two line arrays of the dual-line array is mismatched. Analysis results show the delay-subtract beamforming has better performance of port/starboard discrimination. At last, the sea trial results demonstrate the theoretical results.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Retrieval of ultraviolet skylight radiances and O3 slant column densities from balloon-borne limb spectrometer

With a novel light-weight and absolutely calibrated ultraviolet （UV） spectrometer, UV skylight radiances and O3 slant column densities are measured by balloon-borne limb measurements in Xinjiang area, China. UV skylight radiances measured at the height of 31 km are compared with the results from Modtran in the wavelength range from 290 to 420 nm. O3 slant column densities are derived from radiance spectra in the Huggins bands （320 - 335 nm） using differential optical absorption spectroscopy method. And the parameter exhibits a good correlation with the same value simulated by radiative transfer model （Tracy）. The O3 profile simultaneously measured by an O3 sonde is used as input in Tracy calculations. The O3 sonde is launched on the same balloon.     

Design optimization of highly sensitive LSPR enhanced surface plasmon resonance biosensors with nanoholes

For breaking through the sensitivity limitation of conventional surface plasmon resonance (SPR) biosensors, novel highly sensitive SPR biosensors with Au nanoparticles and nanogratings enhancement have been proposed recently.But in practice, these structures have obvious disadvantages.In this study, a nanohole based sensitivity enhancement SPR biosensor is proposed and the influence of different structural parameters on the performance is investigated by using rigorous coupled wave analysis (RCWA).Electromagnetic field distributions around the nanohole are also given out to directly explain the performance difference for various structural parameters.The results indicate that significant sensitivity increase is associated with localized surface plasmons (LSPs) excitation mediated by nanoholes.Except to outcome the weakness of other LSP based biosensors, larger resonance angle shift, reflectance amplitude, and sharper SPR curves' width are obtained simultaneously under optimized structural parameters.     

Polymer gratings based on photopolymerization for low-order distributed feedback polymer lasers

Novel polymer distributed feedback(DFB)gratings are fabricated based on photopolymerization to reduce lasing threshold of polymer lasers.A photopolymer formulation sensitive to 355-nm ultraviolet(UV)light is proposed for the fabrication of polymer gratings and it can be used to form polymer films by spin-coating process.A very low surface-relief depth ranging from 12.5 to about 1.0 nm has been demonstrated with a refractive-index modulation of about 0.012.The experimental results indicate that such polymer gratings have promising potentials for the fabrication of low-order DFB organic semiconductor lasers.