原子吸收分光光度法测定焊尘中铁,镍,锰

建立了一个焊尘中铁，镍，锰的测定方法，优化了仪器工作参数，在优化后的条件下，铁，镍，锰三个元素的灵敏度分别为０．０４μｇ／ｍＬ／１％，０．０４μｇ／ｍＬ／１％，０．０２μｇ／ｍＬ／１％。线性范围分别为铁０．１－１０μｇ／ｍＬ，镍０．０１－２μｇ／ｍＬ，锰０．０５－５μｇ／ｍＬ。该方法回收率大于９２％，用此方法成功地测定了焊尘中三元素的含量。     

光谱法研究人发,指出中锰,镍含量 变化曲线的特征

在近１０年内按季度收集了同一个人的头发样品３３份和指甲样品,４１份,应用火焰原子吸收光谱法测定了人发和指甲中的锰和镍含量,并分别绘制锰和镍随时间（年）变化曲线,获得锰含量波动范围;人发中０．２１００－１．５００μｇ／ｇ、指甲中０．８３００－２．３９１μｇ／ｇ;镍含量波动范围;人发中０．４９００－１．７５０μｇ／ｇ、指甲中１．１７９－４．１８４μｇ／ｇ。含量变化曲线均具有非线性特征。     

邻硝基苯基荧光酮光度法测定镍的研究和应用

研究了邻基苯荧光酮与镍的显色反应,在ＰＨ＝１０．８的硼砂－氢氧化钠缓冲淀粉 中,在ＣＰＢ和ＯＰ存在下,ｏ－ＮＰＦ和Ｎｉ（Ⅱ）生成３：１的蓝紫色稳定络合物λｍａｘ＝６２０ｎｍ,ε＝１．２０＊１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,符合比耳定律的范围为０－１０μｇ／２５ｍＬ。本方法适用于铝合金中微量镍及水、电镀废水中镍的测定。     

痕量钴、镍和镉的流动注射在线共沉淀预浓集的研究及其FAAS测定

本文应用流动注射分析技术为痕量钴、镍和镉的火焰原子吸收光谱测定建立了一个有效的在线共沉淀预浓集系统。钴、镍和镉离子在弱酸性介质中与ＡＰＤＣ－Ｆｅ２＋产生共沉淀，共沉淀反应和沉淀收集在编结反应器中同时进行。用甲基异丁基甲酮溶洗沉淀在线引入火焰原子化器中进行测定。分析速度为７２样／ｍｉｎ，样品消耗量为１．１ｍｌ以及装样时间３０ｓ时，测定钴、镍和镉获得的增感系数分别为４２、３０、３３。测定含量水平分别为２０．０、１００．０和１０．０μｇ／ｌ，钴、镍和镉的相对标准偏差为２．３％、２．０％和２．４％（ｎ＝１１）。测定钴、镍和镉的检出限（３σ）分别为１．０、３．０和０．３μｇ／ｌ。对尿样标准参考物（ＧＢＷ０９１０３）中镍和镉及动物组织牛肝标准参考物（ＮＢＳ１５７７ａ）中钴的测定结果与标准值一致     

新试剂洋茉莉基荧光酮与铁(Ⅲ)显色反应的研究及应用

本文提出了洋茉莉基荧光酮（ＰＩＦ）光度法测定铁的新方法。在溴代十六烷基吡啶存在下，ＰＩＦ与铁（Ⅲ）形成稳定的蓝色配合物，其最大吸收波长位于６３５ｎｍ。配合物中铁（Ⅲ）与ＰＩＦ的组成比为１∶２。铁的浓度在０．００—０．２４μｇ·ｍＬ－１呈线性关系。表观摩尔吸光系数ε６３５＝１．２６×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。方法用于某些化学试剂中微量铁的测定，结果满意。     

催化分光光度法测定油品中的微量铁

在稀硫酸介质中，铁（Ⅲ）能催化过氧化氢氧化中性红使其褪色。本文对轻油的消化条件进行了考察。轻、重油品分别经消化、灰化后可直接测定。摩尔吸收系数３．４×１０５Ｌ·ｃｍ－１·ｍｏｌ－１，检出限为０．０４－０．０５μｇ／２５ｍＬ，加标回收率为９９．５％－１０１．７％。     

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     

膜溶解富集分光光度法测定微量锰的方法研究

本文以５－Ｂｒ－ＰＡＤＡＰ为显色剂，用ＷＸ型纤维素滤膜为富集分离膜测定微量锰。使用乙醇溶解捕集物，Ｍｎ－５Ｂｒ－ＰＡＤＡＰ在乙醇溶液中最大吸收波长为５６３ｎｍ，表观摩尔吸光系数为９．３２×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。锰浓度在０．１－５．０μｇ／５ｍＬ范围内符合比耳定律，该法灵敏度高，操作简便，方法应用于食品，水样中锰的测定结果满意。     

W^71＋离子态—态双电子复合速度系数的计算

基于Ｃｏｗａｎ相对论多组态ＨＦＲ程序，计算了高离化类锂钨离子在０．１－９ｋｅＶ能量范围内，对应于Δｎ＝０．１的态－态双电子复合速率系数。讨论了速率系数随电子温度，复合类型及中间双激发态中俘获电子的主量子数的变化。     

新试剂5—（2,4—二甲苯偶氮）—罗丹宁与银的显色反应的研究及应用

新试剂５－（２，４－二甲苯偶氮）－罗丹宁，在ｐＨ７．０５的ＮＨ４ＡＣ缓冲液中，当有非离子表面活性剂ＴｒｉｔｏｎＸ－１００存在时，银可与试剂形成１：１的络合物，其络合物的最大吸收波长位５２０ｎｍ，表观摩尔吸光系数εｏ ９．６×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ａｇ量在０－１０μｇ／２５ｍＬ范围内遵循比耳定律，所拟方法用于工业废水中微量银的测定，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.     

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.     

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.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell.     

Single-beam self-referenced phase-sensitive surface plasmon resonance sensor with high detection resolution

A versatile and low-cost single-beam self-referenced phase-sensitive surface plasmon resonance(SPR)sensing system with ultra-high resolution performance is presented.The system exhibits a root-mean-square phase fluctuation of ±0.0028.over a period of 45 min.i.e.a resolution of±5.2×10-9 refractive index units.The enhanced performance has been achieved through the incorporation of three design elements:a true single-beam configuration enabling complete self-referencing so that only the phase change associated with SPR gets detected,a differential measurement scheme to eliminate spurious signals not related to the sensor response,and the elimination of retardation drifts by incorporating temperature stabilization in the liquid crystal phase modulato .Our design should bring the detection sensitivity of non-labeling SPR biosensing closer to that achievable by conventional fluorescence-based techniques.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing.     

A stereo matching algorithm using multi-peak candidate matches and geometric constraints

Gray cross correlation matching technique is adopted to extract candidate matches with gray cross correla- tion coefficients less than some certain range of maximal correlation coefficient called multi-peak candidate matches. Multi-peak candidates are extracted corresponding to three closest feature points at first. The corresponding multi-peak candidate matches are used to construct the model polygon. Correspondence is determined based on the local geometric relations between the three feature points and the multi-peak candidates. The disparity test and the global consistency checkout are applied to eliminate the remaining ambiguous matches that are not removed by the local geometric relational test. Experimental results show that the proposed algorithm is feasible and accurate.