流动注射化学发光法测定头孢氨苄

基于头孢氨苄（CEX）降解产物中有还原性的巯基（SH）基团，在0．2mol/L的H2SO4介质中，能与Ce(Ⅳ）产生化学发光反应，罗丹明6G可敏化其发光强度，结合流动注射技术，考察了本体系的化学发光条件，建立了一种测定头孢氨苄的化学发光新方法。该法线性范围为0．05－10．0μg/mL，相关系数r=0.9984,检出限为0．02μg/mL，对1．0μg/mL的头孢氨苄标准溶液进行连续9次平行测定，相对标准偏差为1．4％。     

富氧空气-乙炔火焰原子吸收光谱法测定钡

于试样溶液中加入0．25％镧和0．5％氯化钾，在富氧空气－乙炔火焰的条件下，可有效地降低干扰及电离效应，具有较高的原子化效率，方法的检出限为0．001μg/mL，灵敏度为0．12μg/mL，可用于矿泉水中钡的测定。     

荧光法直接测定环境水中痕量苯酚

研究了荧光分光光度通过控制酸度直接测定环境水中苯酚的新方法。在pH＝1时，直接测定苯酚的含量，波长为λex／λem＝270／297nm，检出限为4．0g/mL，线性范围为0－3．2μg/mL。回收率为99％－101％。     

铟(Ⅲ)-8-羟基喹啉-核酸三元荧光体系的研究与应用

基于核酸对铟(Ⅲ）-8-羟基喹啉配合物的荧光增强作用，应用铟(Ⅲ)-8-羟基喹啉为荧光探针，研究了铟(Ⅲ)-8-羟基喹啉与核酸的作用，建立了新的核酸测定方法。在最佳条件下，ctDNA、hsDNA、smDNA和yRNA的线性范围分别为0．20-1．40μg／mL、0．20-1．60μg／mL、0．10—1．40μg／mL、0．20—1．20μg／mL。检出限(3o／K)分别为0．004μg／mL，0．002μg／mL，0．002μg／mL，0．002μg／mL；测定实际样品，回收率为90．9％-103．5％。     

富氧空气-乙炔火焰原子吸收光谱法测定锶

于试样溶液中加入含有0．5％镧的溶液，在富氧空气－乙炔的条件下，可有效地降低溶质干扰及电离效应，具有较高的原子化效率，可直接用于饮用水与矿泉水中锶的测定。方法的检出限为0．006μg/mL；灵敏度为0．02μg/mL。     

超声提取-反相高效液相色谱法测定牛膝中蜕皮甾酮

比较了超声提取与回流提取法在提取牛膝中活性成分蜕皮甾酮的提取效率，在频率为1100kHz时超声提取40min可获得稳定的提取效率。采用Shim-Pack CLC-ODS色谱柱，甲醇：水＝40：60（V／V，％）为流动相，在波长248nm下，测定牛膝中蜕皮甾酮，线性范围为2－200μg/mL（r=0．9998），检出限为0．052μg/mL（S/n=3），加标加收率为98．3％－103％。     

火焰原子吸收法测定钢铁中铅时阴离子表面活性剂的增感效应及其机理探讨

火焰原子吸收法测定钢铁中铅，采用0．2％十二烷基硫酸钠（SDS）和0．001mol／L硝酸介质，加入硫脲消除共存元素铋的干扰，铅的浓度在0—20μg／mL范围内服从比耳定律。方法检出限为0．10μg／mL，相对标准偏差为2．30％，回收率为97％—99％，样品测定结果令人满意。并对阴离子表面活性剂增感机理进行了探讨。     

ICP-AES测定催化裂化原料油中的钠

本文应用ICP－AES法测定催化裂化原料油中的钠含量。方法检出限为0．05μg/mL,样品加标回收率为96％－104％，相对标准偏差为3．8％，测定结果令人满意。     

氢化物原子荧光光谱法测定水产品中的痕量汞

本文研究和确定了氢化物原子荧光光谱法检测水产品中汞的适宜检测条件，建立了V2O5－HNO3－H2O2消解体系，并以硫脲作为掩蔽剂，低浓度硼氢化钾为还原剂。本方法线性范围为0－80μg/L；相关系数r≥0．9997；检出限为0．005μg/L；相对标准偏差为0．89％－2．64％；回收率为95．7％－104．3％，可广泛用于水产品中汞的检测。     

紫外分光光度法测定穿琥宁注射液的含量

紫外分光光度法测定穿琥宁注射液的含量。在4．0-36．0μg／mL浓度范围内，呈良好的线性关系，平均回收率为99．1％，RSD为0．65％。方法简单、快速、准确。     

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.