Al(Ⅲ)-CAS-OP-PVA体系分光光度法测定沸石分子筛中的铝

研究了在聚乙二醇辛基苯基醚（乳化剂ＯＰ）及聚乙烯醇（ＰＶＡ）存在下铝（Ⅲ）与铬天青Ｓ（ＣＡＳ）的显色反应。在ｐＨ５．３的ＨＡｃ－ＮａＡｃ缓冲介质中，题示体系最大吸收波长λｍａｘ＝６１２ｎｍ，对比度Δλ＝１０２ｎｍ，表观摩尔吸光系数ε６１２ｎｍ＝２．８４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。铝（Ⅲ）浓度在０－０．６０μｇ／ｍＬ范围内遵守比耳定律。本法已成功地用于沸石分子筛中铝含量的测定，结果良好。该法具有稳定性高、准确度好的特点。     

钒（V）—7—碘—8—羟基喹啉—5—磺酸显色体系测定钢样中的钒

研究了7－碘－8－羟基喹啉－5－磺酸（H2QSI）在乙醇存在下分光光度法测定钒（V）的最佳条件。在乙醇存在下pH4的硫酸介质中，（H2QSI）与V（V）形成了红棕色配合物，最大吸收位于506nm处，表观摩尔吸光系数εmax=2.9×10^3L·mol^-1·cm^-1，有色配合物组成为V（V）：（H2QSI）＝1：3。钒（V）在0－14μg/25mL符合比耳定律。本法用于钢样中的测定，结果满意。H2QSI是光度分析中的一种显色剂，近年来，8－羟基喹啉类试剂用于钒（V）的测定尚未见报道。本文研究了V（V）与H2QSI的显色反应条件及组成，在pH4的乙醇介质中，V（V）与H2QSI生成红棕色配合物，ε506nm=2.910^3L·mol^-1·cm^-1。本方法用于低碳合金钢中钒的测定，结果满意。     

5-Br-PADAP分光光度法测定废水中微量铬(Ⅵ)的研究

本文研究了2-［2-（5-溴吡啶）倡氮］-5-二乙氨基酸（5-Br-PADAP）与Cr（Ⅳ）的显色反应，在阳离子表面活性刑十六烷基三甲基溴化铵（CTB）存在下，于pH4．0的HAc－NaAc缓冲介质中，Cr（Ⅳ）与该试剂生成1：2的紫色配合物，其配合物的最大吸收波长位于592nm，摩尔吸光系数为4．86×104L·mol-1·cm-1，铬（Ⅳ）含量在0—10μg／25mL范围内符合比耳定律。方法用于水样中微量铬的测定。     

5-(偶氮苯)-8-(4-硝基-1-重氮苯)-氨基喹啉与铜显色反应研究应用

研究了新试剂5－（偶氮苯）－8－（4－硝基－1－重氮苯）－氨基喹啉（PANPAQ）与铜的显色反应，在弱碱性介质中，吐温－80存在下，PANPAQ与Cu（Ⅱ）反应生成2：1紫色络合物，λmax＝615nm，ε＝5.19×10^4L·mol^-1·cm^-1，铜含量在0－15μg/25mL内符合比耳定律，方法用于生物样品中铜的测定，结果满意。     

铝－氟－DSPCF分光光度法测定地下水中铝

本文研究了铝－氟－１，５－二（２－羟基－５－磺基苯基）－３－氰基甲（ＤＳＰＣＦ）的显色反应。在硼酸－硼砂介质中，显色反应灵敏，最大吸收波长为６１０ｎｍ，配合物的表现摩尔吸光系数５．０×１０４，铝含量在０－１５μｇ／２５ｍＬ符合比尔定律。该法用于地下水中微量铝的测定获得了满意结果。     

硅钼蓝光度法测定沸石分子筛中的硅

提出沸石分子筛中硅含量测定的硅钼蓝光度法。方法基于盐酸介质中Si（Ⅳ）与钼酸铵形成硅钼黄杂多酸后，用抗坏血酸还原硅钼黄形成硅钼蓝的原理进行硅的测定。本文实验条件下，体系的λmax位于770nm，表观摩尔吸光系数εmax=1.92×10^4L·mol^-1·cm^-1，硅量在0－0.60μg/mL范围内遵守比耳定律。本文提出的新方法已成功地用于某些沸石分子筛中的硅测定。     

新试剂1-(2-羟基苯基)-3-[4-(苯基偶氮)苯基]-三氮烯的合成及与溴化十六烷基三甲铵的显色反应

合成了新试剂１－（２－羟基苯基）－３－［４－（苯基偶氮）苯基］－三氮烯（ＨＰＡＰＴ）,在氢氧化钠碱性介质中,该试剂与溴化十六烷基三甲铵（ＣＴＭＡＢ）形成１∶３的紫红色离子缔合物。λｍａｘ位于５６５ｎｍ,表观摩尔吸光系数为１．５９×１０４Ｌ·ｍｏｌ－１·ｃｍ－１,ＣＴＭＡＢ含量在３—２９．１６ｍｇ·Ｌ－１范围内符合比耳定律。测定了显色体系ＣＴＭＡＢ的临界胶束浓度是１．５０×１０－４ｍｏｌ·Ｌ－１。     

铜与洋茉莉基荧光酮反应的分光光度研究及应用

本文研究了在CPB存在下洋茉莉基荧光酮（PIF）与铜的显色反应。结果表明：在pH5.8-6.6的六次甲基四胺－HCl缓冲介质中，Cu^2 与PIF形成1：2的蓝紫色配合物，以524nm为参比波长、582nm为测定波长，用双波长吸光光度法测得表观摩尔吸光系数为1.11×10^5L·mol^-1·cm^-1。铜在0－0.20μg/mL范围内服从比耳定律。用于高纯稀土氧化物中微量铜的测定，相对误差不大于3.7%，相对标准偏差不大于2.0%（n=6）。     

双水相体系中Cu(Ⅱ)的显色反应研究

本文研究了铬黑Ｔ（ＥＢＴ）作萃取剂和显色剂,在聚乙二醇－２０００（ＰＥＧ）－Ｎａ２ＳＯ４－ＥＢＴ双水相体系中Ｃｕ（Ⅱ）的显色反应条件及应用,实验结果表明,在ｐＨ８．５缓冲溶液中,将Ｃｕ（Ⅱ）络合物从水溶液中萃取到ＰＥＧ相,其最大吸收波长位于５６０ｎｍ,摩尔吸光系数为３．０５×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,此法用于铝合金中铜的测定,获得了满意结果。     

溴化5-[4-(4-吡啶丁氧基)苯基]-10,15,20-三苯基卟啉对铜离子显色反应的研究

本文研究了溴化５－［４－（４－吡啶丁氧基）苯基］－１０,１５,２０－三苯基卟啉与Ｃｕ２＋的显色反应条件,络合物最大吸收波长为４１４ｎｍ,试剂（Ｈ４Ｐ２＋）最大吸收波长为４４６ｎｍ。对比度为３２ｎｍ,试剂与铜络合比为１∶１,表观摩尔吸光系数为２．５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１,铜含量在０．２—１．０μｇ／１０ｍＬ内符合比耳定律,可用于痕量铜的测定。     

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.