原子吸收光谱法研究人发和指甲中铜、锌、镉含量变化曲线的意义

在近１０年内按季度收集了同一个人体的人发样品３３份和指甲样品４１份,应用火争原子吸收光谱法测定了人发和指甲中铜、锌、镉的含量,绘制含量随时间（年）变化曲线,获得铜的波动范围：人发６．２１－１４．７９μｇ／ｇ,指甲０．４６－１５．６５μｇ／ｇ;锌的波动范围,人发９４．６６～１３７．０５μｇ／ｇ,指甲４７．７４～１７３。８３μｇ／ｇ;镉的波动范围,人发０．０１００－０．４１００μｇ／ｇ,指甲０．０２９     

光谱法研究人发、指甲中锰、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.并分别绘制了锰和镍随时间(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.     

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。     

10年人发，指、趾甲镉含量的光谱法测定

在近10年内按季度收集了同一个体人发样品33份,指甲样品41份和趾甲样品39份。应用火焰原子吸收光谱法测定了人发、指甲、趾甲中镉的含量。绘制了含量值随时间(年)的变化曲线。获得了镉含量的波动范围：人发0.010 0～0.410 0 μg*g－1,指甲0.029 5～0.531 4 μg*g－1,趾甲0.089 9～1.274 μg*g－1。变化曲线均具有非线性特征。     

泡沫塑料吸附—石墨炉原子吸收光谱法测定地质物料中痕量铊

本文研制定了一种泡沫塑料吸附－石墨炉原子吸收光谱法测定地质物料中痕量铊的分析，在所先定的实验条件下，方法检出限为０．０５μｇ／ｇ、样准曲线范围为１０－３００ｎｇ／ｍＬ，Ｔｌ含量水平为０．７１μｇ／ｇ时的测定精度为６．０％，方法回收率９９．０％－１００．０％。经标样及大量样品分析验证，分析方法准确可靠。     

流动注射氢化物发生原子吸收法测定血液中硒

采用流动注射分析与氢化物发生原子吸收相结合的方法测定了血液中痕量硒。采用ＨＮＯ３－ＨＣｌＯ４体系溶解样品，取样量少，样品处理简单，快速。本法检出限为０．０６μｇ／Ｌ＾－１（３σ），进样频率为１２０－１５０样次／小时。讨论了砷对硒测定时的干扰及其排除方法，用该法测定了３００个正常人全血和７５个血清样品，其硒含量范围分别为０．０５６－０．１１８μｇｍ１＾－１和０．０４０－０．０７６μｇｍ１＾－１，回收     

平台石墨炉原子吸收法测定高温镍基合金中痕量碲

用镍作基体改进剂，碲的灵敏度提高的约２倍，灰化温度提高４００℃，抗干扰能力明显增强，不需要分离样品基体，采用平台石墨炉即可同温镍基金中痕量磅。方法检出限为０．０４１μｇ／ｇ，样品中碲含量为０．５μｇ／ｇ时，相对标准偏差为３－６％，回收率在９０－９９％之间，方法简单快速。     

火焰原子吸收光谱法连续测定茶叶中的锌、铜和锰

本文研究了茶叶中锌、铜、锰微量金属元素的火焰原子吸收分光光度法的测定。方法简便、快速,灵敏度和精密度高,特征浓度锌为０．００９μｇ／ｍＬ／１％,铜为０．０３１μｇ／ｍＬ／１％,锰为０．０１７μｇ／ｍＬ／１％;相对标准偏差为０．９％～５．０％,回收率９２．０％～１０６．０％。     

次甲基绿—溴酸钾体系催化光度法测痕量钒（V）的研究

本文基于在抗坏血酸存在下，痕量钒（Ｖ）对溴酸钾氧化次甲基绿褪色的新指示反应，建立了一个催化动力学光度法测痕量钒（Ｖ）的新方法。线性范围为０－０．１２μｇ／２５ｍＬ和０．１２－０．２０μｇ／２５ｍＬ，方法检出限为３．４×１０＾－１０ｇ／ｍＬ。用于人发、水样中痕量钒（Ｖ）的测定，结果满意。     

火焰原子吸收法同时测定地质样品中金和银

二氯化锡还原，二氯化汞共沉淀，火焰原子吸收法同时测定地质样品中金和银。对于原矿和尾矿样品，金含量为５．１５μｇ／ｇ，４．４５μｇ／ｇ和０．５４μｇ／ｇ时，相对标准偏差分别为６．２％，３．４％和４．１％。银含量为９．７８μｇ／ｇ和１．２２μｇ／ｇ时，相对标准偏差分别为４．４％，３．５％和１２．５％。金的分析结果与参考值基本一致。金和银的回收率分别为８８－１０２％和８５－１００％。方法具有干扰小，分离     

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.     

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.     

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.     

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.     

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.     

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.