ICP-AES法测定钛合金中的6种元素

用ＨＣｌ分解钛合金样品,直接用ＩＣＰ－ＡＥＳ法测定其中的Ｃｒ、Ｍｏ、Ｆｅ、Ｓｉ、Ａｌ及Ｚｒ６种元素,方法简便、快速、测定各元素含量范围为０．２８％－６．５１％,相对标准偏差为０．７２％－５．０７％,回收率为９７．４％－１０２％。     

ICP-AES快速测定水果中多种微量元素

以干法消化处理样品，电感耦合等离子体-原子发射光谱法(ICP-AES)快速测定了5种水果中的18种微量元素。各分析元素的相对标准偏差小于4．51％，回收率为94．0％-103．0％，方法简单、快速、准确度高。结果令人满意。     

盐酸环丙沙星含量测定方法的研究

本文介绍了盐酸环丙沙星含量测定的离子选择电极法，紫外分光光度法和格兰线性滴定三种不同方法。用于原料药回收率的测定分别为９９．４％，９９．６７％和９９．５％；用于片剂回收率测定分别为９８．８５％，９８．８４％和９８．７３％。结果基本相同，与非水滴定法相比具有测试方便、快速等优点。     

吸光度比值K系数法测定安痛定注射液的含量

吸光度比值Ｋ系数法是一种可以同时测定多元混合组分的分光光度法，本文成功地应用该法测定了安痛定注射液中氨基比林，安替比林和巴比妥三种组分的含量，其平均回收率和相对标准偏差分别为９８．９６％，０．４１％，１００．６％，０．３４％，９８．３３％，０．６５％，本法简便快速，结果准确可靠。     

食品中七种营养元素的原子吸收光谱法测定

采用原子吸收光谱法测定莲子、黑芝麻糊、豆奶粉及麦片4种食品中的Fe、Zn、Ca、Na、K、Mn、Cu等7种营养元素的含量。结果表明：采用标准加入法所得的回收率为95％－108％，相对标准偏差（RSD）为0．3％－3．3％，结果令人满意。     

高速直流时机提高运行效率的措施

直流电动机一般额定转速在3000r／min以下,其铁芯损耗、附加损耗和机械损耗在电机总功率中所占的比例分别为4％～5％、0．5％-1％和1．0％-1．5％的范围,对电机的温升和其他性能的影响并不大．但电机转速提高,这三种损耗将急剧上升,对电动机最明显的影响是温升上升、输出功率下降（效率下降）．     

微量化提取结合毛细管柱气相色谱法测定茶叶中六六六、滴滴涕残留量的探讨

微量化提取结合毛细管柱气相色谱法测定茶叶中六六六，滴滴涕残留量，对六六六，滴滴涕8种异构体都能得到满意的分离效果，采用外标法定量测定，且用此方法检测滴滴涕4种异构体的平均回收率在92．5％－103．2％之间，相对标准偏差在1．6％－3．1％之间，检出限可达0．04μg/kg.     

火焰原子吸收光谱法测定固体废弃物磷石膏中微量铜和铅

利用浓硝酸和浓盐酸消解磷石膏固体样品，选择了这两种酸的最佳用最，建立一种磷石膏样品处理方法。研究了应用火焰原子吸收光谱法直接吸取含盐量高的样品溶液，测定其中CU和pb的可行性。一份样品进行7次测定，结果表明，CU和Pb的RSD分别为2．6％和2．0％，加标回收率分别为92.88％一105．04％和91．20％－103．60％。     

声表面波低插入损耗滤波器的研制(Ⅰ)──控制电极宽度单相单向换器

概述了控制电极宽度单相单向换能错的工作原理和设计方法；讨论了声波单向辐射的方向与柳条反射系数相位之间的关系；给出了作者在ST石英、Y112°LiTaO3和Y128°LiNbO3基片上研制的两种无线通信用中频滤波器和作无绳电话双工器使用的两种滤波器的实验结果．插入损耗分别为4．6dB、3．5dB和3dB；相对带宽分别为0．60％、0．75％和1．4％；阻带抑制均大于50dB．     

废渣中Pb、Cr、Ba、As测定方法的改进

本文利用高频电感耦合等离子体－发射光谱仪直接测定了印钞厂废渣中的Pb、Cr、Ba、As4种微量元素。方法简便、快速、可靠,具有良好的精密度和准确度。相对标准偏差为1．3％－5．8％,回收率为94％－103％。测定结果令人满意。     

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.