石墨炉原子吸收光谱法测定血清中砷

本文研究了石墨炉原子吸收光谱法测定血清中砷的适宜条件，比较了镍与钯对砷的基体改进作用，给出了在Ｔｒｉｔｏｎ－Ｘ－１００存在下，利用钯作为基体改进剂直接测定血清中砷的方法。检出限为６．３７ｎｇ．ｍｌ＾－１，相对标准偏差及回收率分别为１．７９％和９６．８－１０３．２％、线性范围５０－６００ｎｇ．ｍｌ＾－１。     

酸性品红分光光度法测定蛋白质的研究

在ＰＨ１．８的ＫＨ２ＰＯ４－Ｈ３ＰＯ４缓冲介质中,蛋白质与酸性品红结合使染料的吸光度下降。蛋白质浓度Ｃ在０．４０－４．００ｍｇ·Ｌ＾－１和８．００－４０．００ｍｇ·Ｌ＾－１范围内,吸光度的降低与蛋白质浓度（Ｃ）呈线性关系,回归方程分别为△Ａ＝０．０１４０Ｃ＋０．０５３４和△Ａ＝０．０１０９Ｃ＋０．０８９５,相关系数ｒ依次为０．９９６５和０．９９９３,方法用于奶粉和麦片中蛋白质的测定,结果满意。     

流动注射—溶剂萃取—原子吸收光谱法测定微量锰（Ⅱ）

本文研究了一种新的在线流动注射－溶剂萃取预富集－原子吸收光谱分析方法。它具有原理简单，萃取装置，萃取效率高，易操作等特点，经对地表水，人发和中草药中Ｍｎ（Ⅱ）进行在线ＦＩＡ－ＥＸＴ－ＡＡＳ分析得到比较好的结果。方法检出限为０．０７６μｇ．ｍｌ＾－１，ＲＳＤ１．０２％线性范围０．５－５．０μｇｍ．ｍｌ＾－１回收率９４－１０２％。     

罗丹明6G.四溴荧光素双显色体系浮选光度法测定锗的研究

向锗与茜素氨羧络合剂罗丹明６Ｇ形成的Ｇｅ（ＡＷＬＣ３（Ｒ６Ｇ）５甲苯浮选物，加入０．１ｍｏｌ／Ｌ的ＮａＯＨ的溶液，使Ｒ６ＧＹ颜色相同的四溴荧光互，形成等色染料离子对Ｒ６Ｇ＾＋；ＴＢＦ＾－再被甲苯浮选。将浮先物溶于丙酮，于５３０处进行光度测定，由于１０个染料分子同时吸光，使本方法具有很高的灵敏度：ε＝５．８×１０＾５Ｌ．ｍｏｉｌ＾－１，ｃｍ＾－１，锗含量在０．００４０－０．１ｍｇ／Ｌ服从比耳定律。     

正交型光热偏转光谱法及其差分构型研究

本工作设计了一种新的差分式光热偏转光路构型，光路的优点是只使用单一的位置传感器，可随意调节样品池和参考池的距离，电学补偿和差分光路装置简单，容易调整，可以有效地消除溶剂空白吸收的影响和泵浦激光功率起伏的影响。文章还讨论了该差分构型的原理，差分响应公式和基本实验参数。获得的结晶紫和钴的检测下限分别为８．０×１０＾－１０ｍｏｌ／Ｌ和６０ｍｇ／ｍｌ，对应的最小吸光度分别为１．２×１０＾－８和５．４×１０     

新型显色剂2-(H-酸偶氮)-4,5-二硝基苯酚测定铁(Ⅲ)

本文研究了新试剂２－（Ｈ－酸偶氮）－４,５－二硝基苯酚与铁的显色反应,在ＰＨ５．３的ＮａＡｃ－ＨＡｃ缓冲介质中,ＨＡＤＮＰ与Ｆｅ（Ⅲ）生成３：１稳定紫色配合物,λｍａｘ＝５９０ｎｍ,ε＝１．７０＊１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,铁含量在０－１．０ｍｇ／Ｌ范围内符合比耳定律,该法用于自来水样中总铁的测定,结果令人满意。     

Nd1—xBaxMnO3和La0.67Mg0.33Mn0.85M0.15O3（M=Mn,Ga,Fe）中Mn？…

研究了Ｎｄ１－ｘＢａｘＭｎＯ３和Ｌａ０．６７Ｍｇ０．３３Ｍｎ０．８５Ｍ０．１５Ｏ３的导电性，发现Ｍｎ位的自旋磁矩排列状态一大小 和对体系的导电性有强烈的影响，在Ｎｄ１－ｘＢａｘＭｎＯ３中，当Ｍｎ＾３＋／Ｍｎ＾４－的浓度比值为２：１．１：１，１：２时，电阻率出现半导体－金属转变，推论该类体系的导电性首先由体系中Ｍｎ＾３＋和Ｍｎ＾４＋自旋磁矩形的磁结构状态决定，然后才取决于由Ｂａ掇杂浓度所决定的载流子     

FIA—ICP—AES法测定土壤提取液中游离氧化铁的研究

研究了土壤提取液中游离氧化铁含量的ＦＩＡ－ＩＣＰ－ＡＥＳ测定法。考察了采术量以及提取剂（盐酸羟胺和草酯）的浓度对的影响。试验表明：如果选择５０μＬ采样环进样，并将盐酸羟爱和草酸的浓度控制在１０ｍｇ．ｍＬ＾－１以下，则进样顺畅，不出现喷雾嘴堵塞的现象，分析线的背景干扰也得到有效抑制。此法的回收率为９７．６％～１００％，ＲＳＤ≤３．５％。     

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。     

GexSi1—x／Si应变超晶格雪崩光电探测器的分析与优化设计

对ＧｅｘＳｉ１－ｘ／Ｓｉ应变超晶格雪崩光电探测器进行了分析与优化设计，优化结构为：ｉ－Ｓｉ雪崩区厚是１．８～２μｍ；ｐ－Ｓｉ区的掺杂浓度是１０＾１８ｃｍ＾－３厚为１７ｎｍ超晶格总厚为３４０ｎｍ，它可探测１．３～１．６μｍ的红外光。     

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.     

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.     

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.