偏最小二乘法在火焰原子吸收分析中的应用

本文用偏最小二乘法校正了火焰原子吸收分析中Ｐｄ２４７．４３ｎｍ对Ｐｂ２４７．６３８ｎｍ的吸收线重叠干扰，对合成样中Ｐｂ和Ｐｄ的测定，结果令人满意，ＰＬＳ法是谱线重叠干扰的有效校正方法。     

岭回归原子吸收光谱法同时测定铅和铯

本文用岭回归法校正了在火焰原子吸收光谱分析中铯２４７．６４３ｎｍ对铅２４７．６３８ｎｍ的吸收线重叠干扰,并用本法对混合样中铅和铯进行了测定,结果令人满意,可以认为岭回归可能是解决原子吸收谱线重叠干扰的一种方法。     

系数倍率法在原子吸收光谱法中的应用--Mn的测定

本文用系数倍率法校正了火焰原子吸收分析中Ｇａ４０３．３０ｎｍ对Ｍn４０３．３１ｎ ｍ的光谱干扰,用于合成样中Ｍjn含量的测定,结果令人满意。     

外加静电场下激光诱导等离子体特性的实验研究

在外加静电场下，准分子激光诱导等离子体中Ｍｇ原子５５２．８４、５１６．７３、４７０．３０ｎｍ三条发射谱线展宽的时间分辨特性的实验研究，实验测定结果表明，外加静电场导致了原子发射谱线展宽超过Ｓｔａｒｋ展宽，这种额外展宽的大小在０．１ｎｍ左右，其中４７０．３ｎｍ谱线的加宽和线移最大，采用量子理论计算表明这种额外展宽是由于在外电场中作用下作定向运动的电子与激发态原子碰撞所致。     

偏最小二乘法在原子吸收光谱分析中的应用——钴和铟的同时测定

本文用偏最小二乘法（ＰＬＳ）校正了火焰原子吸收分析Ｉｎ２５２．１３７ｎｍ对Ｃｏ２５２．１３６ｎｍ的吸收线重叠干扰,对混合样中Ｃｏ和Ｉｎ的含量进行了测定,结果令人满意。     

岭回归原子吸收光谱法同时测定Fe和Pt

火焰原子吸收光谱法在271．903nm波长处测定Fe时，Pt对其吸收线产生谱线叠加干扰，用岭回归法校正了Pt271．904nm光谱法对Fe271．903nm的干扰，以Fe元素空心阴极灯同时测定Fe、Pt两种元素。     

PLS-原子吸收光谱法同时测定稀土氧化物中的Eu和Cu

用偏最小二乘法（ＰＬＳ）校正了火焰原子吸收分析中Ｅｕ３２４．７５３ｎｍ对Ｃｕ３２４．７５４ｎｍ吸收线重叠干扰,用铜空心阴极灯同时测定了合成样及稀土氧化物中的Ｅｕ和Ｃｕ。     

岭回归原子吸收光谱法同时测定钴和铟

用岭回归法校正了火焰原子吸收光谱分析中In 252.137nm对Co 252.136nm的吸收线重叠干扰,对合成样品中Co和In的含量进行了同时测定,结果令人满意.可以认为岭回归可能是解决原子吸收谱线重叠干扰的一种方法.     

多重谱线拟合（MSF）扣除光谱干扰法在电感耦合等离子体发射光谱？…

在用用电感耦合等离子体发射光谱法测定钢铁中磷时,已有的研究报告中大多采用Ｐ１７８ｎｍ作分析谱线,但因其发射强度低而使测定精度和检出限不理想。本文在采用多重谱线拟合（ＭＳＦ）法扣除光谱干状的基础上,测定了存在严重光谱干扰的Ｐ２１４ｎｍ、Ｐ２１３ｎｍ谱线,同时测定了没有光谱干扰的Ｐ１７８ｎｍ,Ｐ１７７ｎｍ谱线,结果表明,Ｐ２１３ｎｍ谱线的测定精密度和检出限最好,比常用Ｐ１７８ｎｍ谱线的精密精密度高５倍     

岭回归原子吸收光谱法同时测定锰和镓

本文用岭回归法校正了火焰原子吸收分析中Ga403.30nm对Mn403.31nm的吸收线重叠干扰,对合成样中Mn和Ga测定结果令人满意。岭回归是解决原子吸收谱线重叠干扰的一种可能方法。     

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.     

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.     

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.