共沉淀富集火焰原子吸收光谱法法测定固体弃物磷石膏中痕量镉

用ＣｕＳ作捕集沉淀剂共沉淀富集分离磷石膏中痕量Ｃｄ,研究了最佳沉淀条件,对溶液共沉淀酸度,沉淀试剂用量进行了讨论。平行６次测定Ｃｄ含量为０．０４４μｇ／ｇ的磷石膏样品,相对标准偏差为７．７９％,加标回收率在８８％￣１１０％之间。     

ICP—AES法测定锌及其化合物中的杂质元素

采用样品溶解后直接测定及氢氧化钇共沉淀将锌与被测杂质元素分离后测定相结合，研究了锌及其化合物中Ａｇ，Ｃｏ，Ａｌ，Ｎｉ，Ｆｅ，Ｃｕ，Ｃｄ，Ｃｒ，Ｍｎ，Ｉｎ，Ａｓ，Ｐｂ，Ｓｎ，Ｓｂ，Ｂｉ等１５个杂质元素的ＩＣＰ－ＡＥＳ测定方法，相对标准偏差１．６－８．１％。     

萃取—火焰原子吸收法测定骨骼中的微量元素Cu,Zn,Cd和Fe

本文研究了以邻菲罗啉为金属螯合剂，高氯酸钠为配体，在一定酸度下用１，２－二氯乙烷萃取－火焰原子吸收法测定动物骨骼中微量Ｃｕ，Ｚｎ，Ｃｄ和Ｆｅ的条件，并确定了测定方法，方法简单，准确，可靠，元素的检测限分别为：Ｃｕ：０．０３８μｇ／ｍｌ，Ｚｎ：０．００４２μｇ／ｍｌ，Ｃｄ：０．００１９μｇ／ｍｌ，Ｆｅ：０．０２μｇ／ｍｌ，回收率在９２．８％～１０５％之间。     

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     

APDC共沉淀分离富集—火焰原子吸收分光光度法测定明矾中的痕量铅

本文研究了ＡＰＤＣ－Ｃｕ（Ⅱ）共沉淀分离富集，开槽管原子捕集火焰原子吸收光谱测定铅的条件，发现痕量铅在ｐＨ值为２－８条件下能被ＡＰＤＣ－Ｃｕ（Ⅱ）定量共沉淀，方法的检出限可达１．５×１０＾－２μｇ／ｍＬ。用于明矾中痕量铅的分离富集和测定，共存物质不产生干扰，样品６次平行测定的相对标准偏差〈４％。加标回收率在９８％－１０３％之间。     

碳酸锶共沉淀富集火焰原子吸收法测定微量镉

用碳酸锶作为载体共沉淀富集镉使火焰原子吸收法测定镉的灵敏度大幅度提高。特征浓度０．０４４μｇ·ｍｌ－１／１％，加标回收率９９．７５～１０４．５％，ＳＤ是０．００６，ＣＶＳ．５２％。     

电感耦合等离子体质谱法测定高纯镉中的杂质元素

采用电感耦合等离子体质谱法测定高纯镉中的杂质元素。讨论了镉基体的谱线干扰,比较了镉基体产生的多原子离子的干扰程度,该干扰按ＣｄＨ、ＣｄＯ、ＣｄＯ２ 、ＣｄＡｒ、ＣｄＯＨ和ＣｄＯＨ２ 顺序递减。研究了不同浓度镉基体对分析物信号的抑制或增强效应,镉的浓度大于０．２５ｇ·Ｌ－ １ 时,对质量数小于１００的分析物的信号强度产生抑制,而对质量数大于１５０ 的分析物的信号强度产生增强,采用８９Ｙ和２０９ Ｂｉ作内标分别克服基体的抑制和增强效应。测定了高纯镉的Ａｓ、Ｂｅ、Ｃｏ、Ｃｕ、Ｇａ、Ｇｅ、Ｍｎ、Ｍｏ、Ｐｂ、Ｎｉ、Ｓｒ、Ａｕ、Ｔｌ、Ｔｈ、Ｖ 和Ｕ 等１６ 个杂质元素,方法的检测限０．００５～０．０５２ μｇ·Ｌ－ １ ,标准加入回收率８２％ ～１０８％ 。     

ICP-AES法测定青壳鸡蛋中的13种元素

用高压消化罐消解后,ＩＣＰ－ＡＥＳ法同时测定青壳鸡蛋中Ｃａ、Ｍｇ、Ｆｅ、Ｍｎ、Ｚｎ、Ｃｕ、Ｐ、Ｉ、Ｓｅ、Ｓｂ、Ｂａ、Ｃｒ、Ｃｄ等１３种元素的含量,在优化实验条件下,ＲＳＤ为１．２４％－８．７６％,加标回收率为９３．０％－１０５．９。方法简便、可靠,结果令人满意。     

用能带理论计算清洁Ag（111）,Ag（110）和Ag（001）表面的弛豫

用一维能带理论计算了清洁Ａｇ（１１１），Ａｇ（１１０）和Ａｇ（００１）表面的弛豫。计算结果显示出，当ｄ１＝２．６４０（膨胀４．２％）和ｄ２＝２．９２０（膨胀２３．８％）〔对ｎｇ（１１１）〕；ｄ１＝１．３７５±０．００８（收缩４．８％±０．００８）［对Ａｇ（１１０）」；ｄ１＝２．０４８±０．００５（膨胀０．２４％±０．００５）［对Ａｇ（００１）〕时，理论计算的ＬＥＥＤ谱与实验非常一致。     

ICP－AES法分析水质的探讨

本文用ＩＣＰ－ＡＥＳ（电感耦合等离子体－原子发射光谱法）测定水中Ａｌ、Ｂ、Ｂａ、Ｂｅ、Ｃａ、Ｃｄ、Ｃｏ、Ｃｒ、Ｃｕ、Ｆｅ、Ｍｇ、Ｍｏ、Ｍｎ、Ｎｉ、Ｐｂ、Ｓｒ、Ｖ、Ｚｎ等１８种微量元素。方法简便、快速，只将样品简单酸化，即可测定。方法检出限为０．０００５－０．５μｇ／ｍＬ。相对标准偏差＜１８％     

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.