测定双嘧达莫的化学发光新方法

提出了双嘧达莫与高锰酸钾和罗丹明B的化学发光新体系,并发现表面活性剂吐温-80可显著增强该体系的化学发光,据此建立了流动注射化学发光测定双嘧达莫的新方法。该方法选择性好,灵敏度高,线性范围宽,双嘧达莫在5.0×10-8～5.0×10-5g·mL-1范围内与发光信号呈线性关系,检出限1.7×10-8g·mL-1, RSD为1.1%(n=11, c_s=1.0×10-6g·mL-1双嘧达莫浓度)。     

流动注射化学发光法测定山奈酚

采用流动注射技术,研究了高锰酸钾-山奈酚-过氧化氢体系的化学发光行为,对影响化学发光强度的因素进行了试验,建立了流动注射化学发光法测定山奈酚的新方法.方法检出限为1×10-10g·mL-1,线性范围为1.0×10-7-1.0×10-4g·mL-1.对1.0×10-6g·mL-1的山奈酚平行测定11次,其RSD为2.1%...     

流动注射化学发光法灵敏测定人血液和血清中血红蛋白

在碱性介质中,发现血红蛋白对luminol-hydrazine弱化学发光体系有显著的增强作用。结合流动注射法提出了luminol-hydrazine化学发光(FI-CL)测定血红蛋白的新方法,优化了化学发光检测条件和FI-CL系统的运行参数,考察了实际样品中可能含有的共存物质对血红蛋白测定的影响。结果表明,血红蛋白的线性范围为5.0×10-9～6.0×10-5 g·mL-1,检出限是5.8×10-10 g·mL-1 (9.0×10-12 mol·L-1),分别对5.0×10-7和3.0×10-6 g·mL-1的血红蛋白标准溶液平行八次测定所得RSDs分别为1.6%和1.5%。将提出的方法成功用于人血液和血清中血红蛋白含量的测定,加标回收率在83.0%～101.0%范围。结合化学发光光谱和紫外可见吸收光谱对血红蛋白催化luminol-hydrazine化学发光反应的机理进行了探讨。提出的方法具有灵敏度高、无需标记、操作简便、快速、易实现自动化操作等优点。     

流动注射化学发光测定盐酸丙卡特罗

发现盐酸丙卡特罗(Procaterol hydrochloride)在硫酸介质 中能与铈(Ⅳ)和罗丹明B产生微弱的化学发光,而在该体系中加入盐酸和表面活性剂CTMAB,能显著增强化学发光的强度。探索了该化学发光体系最佳的反应条件,初步提出了该体系的反应机理,据此建立了流动注射化学发光测定盐酸丙卡特罗的新方法,线性响应范围为2×10-8g·mL-1～1×10-6g·mL-1,检出限为6×10-9g·mL-1; 对2.0×10-7g·mL-1盐酸丙卡特罗连续11次平行测定的相对标准偏差为1.6％,该方法用于测定盐酸丙卡特罗片剂并与标准方法(中国药典法)比较,结果令人满意。     

流动注射化学发光法测定诺氟沙星

在酸性条件下,Ce(Ⅳ)与诺氟沙星(NFLX)能产生弱的化学发光反应,十二烷基硫酸钠(SDS)对其有较强的增敏作用。据此建立了一种简单、快速、可连续测定诺氟沙星的流动注射化学发光新方法。该法线性范围7.78×10-8～5.82×10-6 g·mL-1 ,检测限(3σ)为1.57×10-8 g·mL-1,对1.94×10-6 g·mL-1 的NFLX标准溶液平行测定10次,相对标准偏差为1.7%。该法成功应用于诺氟沙星胶囊的测定, 还对其机理进行了初步探讨。     

反相流动注射-化学发光法测定盐酸多巴胺

基于在碱性介质中,盐酸多巴胺对鲁米诺-铁氰化钾化学发光反应体系的强烈抑制作用,建立了反相流动注射抑制化学发光测定盐酸多巴胺的新方法。研究了影响化学发光强度的因素,并探讨了化学发光反应的可能机理。该方法快速、准确、线性范围宽,测定盐酸多巴胺的检出限为1.14×10-9 g·mL-1,方法的线性范围为2.0×10-9～8.0×10-7 g·mL-1,对于4.0×10-7 g·mL-1盐酸多巴胺测定11次的相对标准偏差为0.99%。应用于盐酸多巴胺注射液中盐酸多巴胺的测定,结果满意。     

一个检测痕量汞离子的鱼精DNA修饰纳米金共振散射光谱法

在pH 7.0 Tris-HCl缓冲溶液及0.017 mol.L-1NaCl介质中,鲱鱼精DNA与10 nm的金纳米粒子形成较稳定的结合物使得金纳米粒子不聚集,体系的散射信号较弱。当有Hg2+存在时,DNA与Hg2+形成更稳定的DNA-Hg2+结合物,金纳米粒子聚集导致572 nm处的共振散射峰增强。在3.87μg.mL-1金纳米粒子-11.7μg.mL-1DNA-pH 7.0~17 mmol.L-1NaCl条件下,Hg2+浓度c在3.3~3 333.3 nmol.L-1范围内与572 nm处的共振散射强度增强值ΔI572 nm成良好线性关系,其回归方程、相关系数、检出限分别为ΔI572 nm=0.019c+5.0,0.999 1,2.5 nmol.L-1。该法用于水样分析,结果与冷原子吸收光谱法一致,相对标准偏差为5.1%。     

流动注射化学发光测定间苯三酚

基于在甲醛存在条件下,高锰酸钾在酸性介质中氧化间苯三酚而直接产生化学发光,结合流动注射技术建立了测定间苯三酚的化学发光分析方法,该法测定间苯三酚的线性范围为5.0×10-9～5.0×10-5 mol·L-1,检出限为3.0×10-9 mol·L-1,相对标准偏差为2.5%(1.0×10-6 mol·L-1间苯三酚,n=11)。该法应用于测定在几种实际水样中加入的间苯三酚,回收率令人满意。     

化学发光法测定枳壳中生物碱含量

在酸性介质中,高锰酸钾可氧化辛弗林产生化学发光,对影响化学发光强度的因素进行了实验和探讨,建立了高锰酸钾化学发光体系测定辛弗林的新方法。在最佳实验条件下,辛弗林的线性范围为4.00×10-7—2.00×10-5mol/L;检出限为6.96×10-8mol/L。该体系已经成功应用于枳壳中生物碱含量的测定,回收率为92.8%。此外,本文还测定了酸性高锰酸钾-辛弗林体系的化学发光光谱和荧光光谱,初步探讨了化学发光反应机理。     

鲁米诺-铁氰化钾化学发光体系快速分析生物样品中莱克多巴胺

该文建立了新的流动注射-化学发光快速测定莱克多巴胺的分析方法。基于碱性介质中莱克多巴胺对鲁米诺-铁氰化钾体系化学发光的增敏作用,研究了各因素对化学发光的影响。结果表明,在最佳发光条件下,相对发光强度与莱克多巴胺浓度在4.0×10-9～8.0×10-7 g.mL-1范围内呈良好的线性关系,检出限为2.5×10-9 g.mL-1,相对标准偏差为5.6%。应用该方法成功分析了猪肉和尿样中莱克多巴胺的含量,回收率为69.3%～101.3%,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.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

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.