镝—镧—钛试剂荧光体系的协同发光效应及其分析应用

发现了镧对镝－钛铁试剂荧光体系的协同发光效应,详细研究了镝－镧－钛铁试剂协同发光体系的荧光光谱特性,确定了各种试验条件对体系荧光强度的影响。     

一种新的共发光体系──铽－钆（钪）－均苯四甲酸体系的研究和应用

本文研究发现铽与均苯四甲酸有强烈的荧光反应，并观察到钆（钪）存在下的共发光现象，研究了该反应的荧光特点和影响因素，确定了反应和测定的最佳条件。钆和钪的引入使原有的铽－均苯四甲酸体系的荧光分别增加了２４０和９５倍。在最佳条件下，对应于钆和钪，铽的浓度分别在５．０×１０－８～３．０×１０－５ｍｏｌ／Ｌ和７．０×１０－８～１．０×１０－５ｍｏｌ／Ｌ的范围内与荧光强度成线性关系，检测限分别为２．０×１０－１０和５．０×１０－１０ｍｏｌ／Ｌ采用多点增量标准加入法测定了合成样品和包头稀土样品中的铽。回收试验的回收率为１００．１±０．０１％和９９．１±０．０３％。     

3,4-二羟基苯甲酸的流动注射化学发光抑制分析法

本文基于３,４－二羟基苯甲酸对Ｃｏ２＋离子催化的鲁米诺－Ｈ２Ｏ２化学发光体系的抑制作用,首次建立了３,４－二羟基苯甲酸的流动注射化学发光抑制分析法,发光信号的降低值ΔⅠ与３,４－二羟基苯甲酸的浓度在１×１０－６～１×１０－５ｍｏｌ／Ｌ的范围内呈良好的线性关系,检出限为２．７×１０－７ｍｏｌ／Ｌ（ｎ＝１１）,对８×１０－６ｍｏｌ／Ｌ３,４－二羟基苯甲酸测定的相对标准偏差为２．３％（ｎ＝１１）。     

镧对镝-磺基水杨酸配合物荧光增强效应的研究和应用

本文研究发现,三价稀土离子Ｌａ３＋的存在对二元配合物Ｄｙ３＋－磺基水杨酸（ＳＳＡ）体系具有强烈的荧光增强效应。在常温条件下,研究了Ｌａ３＋参与下Ｄｙ３＋－ＳＳＡ体系的荧光特性、形成条件和影响因素,结果表明,Ｌａ３＋可使Ｄｙ３＋－ＳＳＡ体系荧光增强１００倍。在最佳条件下,Ｄｙ的浓度在３．０×１０－７～１．０×１０－５ｍｏｌ／ｄｍ３范围内与荧光强度成线性关系,检测限达到８．０×１０－８ｍｏｌ／ｄｍ３。利用该体系测定了合成稀土样品和包头稀土标准样品,结果满意,回收实验的回收率为９９．３％±０．１％。     

2—溴甲基萘荧光和室温磷光性质研究

研究了２－溴甲基萘（２－ＢｒＭＮ）的荧光及磷光性质。２－溴甲基萘是一种优良的荧光试剂,λｅｘ／λｅｍ＝２７４／３３４ｎｍ,其浓度在１．０×１０＾－６～１．２×１０＾－４ｍｏｌ·Ｌ＾－１范围内与荧光强度呈良好的线性关系,相关系数ｒ＝０．９９９,最低检测限为４．７×１０＾－８ｍｏｌ·Ｌ＾－１。以β－环糊精（β－ＣＤ）作保护剂和１,２－二溴丙烷（ＤＢＰ）为重原子微扰剂的２－ＢｒＭＮ／β－ＣＤ／ＤＢＰ体系     

稀土元素荧光增强效应的研究─RE对Eu－苯甲酰三氟丙酮－溴化十六烷基三甲基铵体系的荧光增强

本文详细研究了稀土元素Ｌａ３＋、Ｇｄ３＋、Ｔｂ３＋、Ｌｕ３＋、Ｙ３＋及Ｓｃ３＋对铕苯甲酰二氟丙酮（ＢＴＡ）－阳离子表面活性剂体系的荧光增强效应。结果表明，在上述增强离子的分别存在下，体系的荧光强度分别增加１７、７５、６５、５、５５和１８倍，铕浓度在１．０×１０－１０－８．０×１０－７ｍｏｌ／Ｌ范围内与荧光强度成线性关系，最低检出限为１．０×１０－１１ｍｏｌ／Ｌ利用标准加入法测定了混合稀土氧化物中的铕，结果满意。     

Tb-吡哌酸的荧光体系及尿和血清中吡哌酸含量的测定

本文报道了Ｔｂ－吡哌酸生成络合物后,在紫外光照射下发生分子内能量传递使Ｔｂ产生特征荧光,其荧光强度与吡哌酸的浓度成线性关系,由此建立了一种灵敏、快速的分析吡哌酸的方法。此方法具有背景干扰小,选择性高和体系中铽的荧光寿命长等特点。尤其适用于血清、尿样等体液分析,回收率在９４．６％～１０２％。该方法检出限为３．６ｎｇ／ｍＬ。其线性范围是５．０×１０－８～４．０×１０－６ｍｏｌ／Ｌ。     

黄嘌呤氧化酶－乙醛－吖啶酯化学发光分析新体系

乙醛在黄嘌呤氧化酶催化作用下，被空气氧化生成乙酸和过氧化氢，酶反应生成的过氧化氢氧化新吖啶酯试剂［１０－甲基－９－（对甲酰苯基）吖啶羧酸酯氟磺酸盐］产生化学发光，化学发光强度与己醛浓度在一定范围内成线性关系．由此建立了一种化学发光分析新体系，用于测定乙醇含量．线性范围２．０×１０－７～１．２×１０－３ｍｏｌ／Ｌ，测定５．０×１０－７ｍｏｌ／Ｌ乙醛，相对标准偏差为６．８％，检测限为１．２×１０－７ｍｏｌ／Ｌ，测定环境水样中乙醇含量，取得满意结果，回收率为９５～１０６％．     

乳酸环丙沙星的荧光特性及其应用

本文对乳酸环丙沙星的荧光特性进行了研究,研究发现,该物质在０．１ｍｏｌ／Ｌ盐酸介质中有很强的荧光性质,其激发波长为２８５ｎｍ和３３０ｎｍ,发射波长为４５０ｎｍ,乳酸环丙沙星浓度在５×１０－９—１×１０－６ｍｏｌ／Ｌ范围内与荧光强度呈线性关系。用荧光法测定注射液中乳酸环丙沙星的含量,方法简单,快捷、灵敏度高。结果令人满意。     

铽-EDTA-槲皮素荧光体系及槲皮素的测定

铽－ＥＤＴＡ－槲皮素在碱性条件下生成三元络合物,在紫外光照射下发生分子内能量传递,槲皮素能敏化Ｔｂ３＋的发光,铽的荧光强度与槲皮素的浓度成线性关系。据此建立了一个快速、灵敏、简单的分析血清、尿液和芦丁与槲皮素混合物中槲皮素含量的一种新方法。该方法的线性范围为５．０×－７～１．０×－５ｍｏｌ·Ｌ－１,检测限为５．１×１０－８ｍｏｌ·Ｌ－１,方法成功地应用于未经处理的血清、尿液中槲皮素的测定,其回收率在１０３％～９６％。同时利用其方法的高选择性测定了芦丁和槲皮素双组分中槲皮素的含量     

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.