火焰原子吸收微量进样法测定耳血中Cu,Zn,Ca,Mg和Fe

本文利用原子吸收分光光度法采用微量注射进样，测定耳全血中Ｃｕ，Ｚｎ，Ｃａ，Ｍｇ和Ｆｅ的含量，结果表明，方法回收率在９６％以上，样品测定的相对标准误差Ｚｎ，Ｃａ，Ｍｇ和Ｆｅ小于２％，Ｃｕ为３．９％，本方法快速，准确，仅需１０μＬ耳血即可获得五种生命元素含量的满意结果。     

微量注射进样火焰原子吸收法测定耳血全血锌铜及幼儿正常参考值的获得

本文介绍了在国产WFX-IF2型原子吸收分光光度计上,应用微量注射进样技术和火焰原子吸收法测定人耳血全血锌铜的分析方法。以间断(小体积样品)喷雾取代连续喷雾技术,使样品溶液进样体积降至10～20μl。     

流动注射-导数火焰原子吸收光谱测定植物油中的铜、锌

提出了流动注射 导数火焰原子吸收光谱测定植物油中的微量铜和锌的新方法。流动注射进样技术克服了常规火焰原子吸收法耗样量大和基体干扰严重的缺点。导数技术应用于火焰原子吸收可提高方法的灵敏度和信号的选择性。流动注射与导数技术相结合应用于火焰原子吸收成功地测定了植物油中的微量铜和锌。铜和锌的特征浓度分别为 0 0 0 4 0 ,0 0 0 12 μg·mL-1,相对标准偏差在 1 1%～ 5 1%的范围内。     

石墨炉原子吸收法测定全血中的铜和锌

研究了石墨炉原子吸收法测定全血中铜和锌的方法。提出了用０．１％Ｔｒｉｔｏｎ Ｘ－１００溶液作稀释剂,按１：５０体积比稀释血样,采用校准曲线法就可测定全血中的铜和锌,方法简单,快速,并与基体匹配的校准曲线比较,结果令人满意。     

微量进样火焰原子吸收法测定血球血浆中锌的含量

本文介绍在国产ＷＹＸ－４０２型原子吸收分光光度计上，用微量进样测定血球、血浆中Ｚｎ的含量，获得了与常规原子吸收法相同的灵敏度，一次测定的进样量为３００μＬ，测得血球中锌的平均回收率为９７．９％，相对标准偏差为３．４％，血浆中锌平均回收率为１００．８５，相对标准偏差为３．３％。     

微量注射进样火焰原子吸收法测量植物油中锌

采用高温干灰化法处理豆油、棉籽油和芝麻油样品（４８０℃、４０小时）,将常规火焰原子吸收进样装置改成微量注射进样后测油中锌含量,每次进样量为３０μＬ,并对最佳进样条件进行了实验。特征浓度为０．０９８μｇ／ｇ;检测限为０．００３６８μｇ／ｇ;相对标准偏差为２．６％;回收率分别为９８．９％,１０７．８％,９２．９％;三种植物油中锌含量分别为９．６７,１．４２和１．７７μｇ／ｇ。     

142名健康成人血清铜的含量测定

本文用原子吸收法对吉林市１４２名健康成人血清铜的含量进行了测定。结果表明，男性血清铜值稍代于女性，但经统计学处理无显著性差异（Ｐ＞０．０５）。提出其正常值范围。     

流动注射在线萃取—火焰原子吸收光谱法测定明胶中的微量Fe和Cu

本文采用氧化水解制样及流动注射在线取火焰原子吸收光谱法，测定明胶中微量Ｆｅ和Ｃｕ，解决了水解法制样测定结果偏低和不能直接测定低含量样品的问题。本文法测定Ｆｅ和Ｃｕ的灵敏度分别提高了１４．５倍和１７．６倍，分析速度达３６次／ｈ，Ｆｅ和Ｃｕ的回收率分别在９０．８－１１０．５％和７．５－１０７．０％之间，测定精密度分别为４．５３％和４．２６％。     

原子捕集－火焰原子吸收光谱法测定人发中的微量铜

本文详细地考查了原子捕集的测定条件及介质的影响，成功地测定了人发中的微量铜。原子捕集法的灵敏度在捕集时间为１ｍｉｎ时为常规法的８．７倍，加标回收率９４．４％－１００．４％。     

微量进样火焰原子吸收光谱法测定血浆,红细胞中铜,铁和锌

本文叙述了在国产ＷＹＸ－４０２型原子吸收分光光度计上采用微量增样技术，用火焰原子吸收光谱法测定血浆，红细胞中铜，铁和锌的含量，获得了与常规法相同的灵敏度。血浆中铜，铁和锌的平均回收率分别为１０１．０％，１０３．０％，１００．８％。相对标准偏差分别为１．２５％，１．４４％，３．１４％。红细胞中铜，铁和锌的平均回收率分别为１０２．５％，１０４．９％，９７．９％，相对标准偏差分别为３．４％．１４８％．３     

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.