溴化5-[4-(4-吡啶丁氧基)苯基]-10,15,20-三苯基卟啉对铜离子显色反应的研究

本文研究了溴化５－［４－（４－吡啶丁氧基）苯基］－１０,１５,２０－三苯基卟啉与Ｃｕ２＋的显色反应条件,络合物最大吸收波长为４１４ｎｍ,试剂（Ｈ４Ｐ２＋）最大吸收波长为４４６ｎｍ。对比度为３２ｎｍ,试剂与铜络合比为１∶１,表观摩尔吸光系数为２．５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１,铜含量在０．２—１．０μｇ／１０ｍＬ内符合比耳定律,可用于痕量铜的测定。     

邻羧基苯基荧光酮与碲显色反应的研究及应用

在ｐＨ＝４．５ＨＡｃ－ＮａＡｃ缓冲介质中,ＣＴＭＡＢ存在下,邻羧基苯基荧光酮（ｏ－ＣＰＦ）和Ｔｅ（Ⅳ）生成４∶１稳定络合物,λｍａｘ＝５６０ｎｍ,ε＝１．２５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｔｅ（Ⅳ）含量在０—１０μｇ／２５ｍＬ内符合比耳定律,方法用于烟尘中碲的测定,结果令人满意。     

铜与2-羟基-3-羧基-5-磺酸基苯重氮氨基偶氮苯反应的分光光度法研究及应用

研究了铜与２－羟基－３－羧基－５－磺酸基苯重氮氨基偶氮苯（ＨＣＳＤＡＡ）的显色反应。在Ｔｒｉ－ｔｏｎＮ－１０１存在下和ｐＨ１０．４～１１．５的缓冲介质中，Ｃｕ２＋与ＨＣＳＤＡＡ形成１∶２的红色配合物，其最大吸收波长是５３０ｎｍ，对比度为１０２ｎｍ，表观摩尔吸光系数为１．３１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。铜在０～０．２４μｇ／ｍＬ范围内服从比尔定律。用于铅锌矿和花生中微量铜的测定，相对误差不大于３．７％，相对标准偏差不大于１．６％（ｎ＝６）。     

新显色剂4,4′-二(2,6-二溴-4-硝基苯基重氮氨基)联苯与汞显色反应的研究

本文研究了新显色剂４，４′－二（２，６－二溴－４－硝基苯基重氮氨基）联苯与Ｈｇ（Ⅱ）的显色反应，在表面活性剂ＴｒｉｔｏｎＸ－１００的存在下，于ｐＨ８．８的Ｎａ２Ｂ４Ｏ７－ＨＣｌ缓冲溶液中，试剂与Ｈｇ（Ⅱ）形成２∶２橙红色配合物，其最大吸收峰位于４９０ｎｍ，表观摩尔吸光系数为７．６２×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。Ｈｇ（Ⅱ）量在０－１２μｇ／２５ｍＬ范围内符合比耳定律。方法用于废水中微量Ｈｇ（Ⅱ）的测定，结果满意。     

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。     

新型卟啉吡啶季铵盐与铜(Ⅱ)显色反应的研究

本文研究了在不使用表面活性剂情况下,新型卟啉试剂溴化５－［４－（４－吡啶丁氧基）苯基］－１０,１５,２０－三（４－甲氧基苯基）卟啉与铜（Ⅱ）的显色反应。结果表明,ｐＨ＝５－７时,铜（Ⅱ）与此卟啉形成了稳定配合物,其表观摩尔吸光系数为２．３７×１０５Ｌ·ｍｏｌ－１·ｃｍ－１,铜浓度在０－１．２μｇ／１０ｍＬ范围内服从比耳定律。配合物组成的摩尔比为Ｃｕ∶卟啉吡啶季铵盐＝１∶２,本方法应用于环境水样中铜的测定,结果满意     

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。     

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。     

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。     

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.     

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.     

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.     

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.     

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.     

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.     

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.