高效阴离子交换色谱积分脉冲安培法测定蓝藻细胞培养液中的蔗糖和甘油葡糖苷

建立了一种测定蓝藻细胞培养液中蔗糖和甘油葡糖苷的高效阴离子交换色谱积分脉冲安培检测法。在最佳的分离条件下,蔗糖和甘油葡糖苷的质量浓度在0.1~50.0 mg/L范围内与色谱峰面积线性良好,线性相关系数r20.999 9。蔗糖和甘油葡糖苷的最低检测限分别是0.15 mg/L和0.03 mg/L,测定结果的相对标准偏差小于2%(n=8)。该方法样品处理简单,无基体干扰,测定的准确度,灵敏度高,可应用于蓝藻培养液中蔗糖和甘油葡糖苷的测定。     

RIG型磁光薄膜的研究进展及应用

随着光通信技术与光子集成电路的发展,非互易性器件作为光通信系统中重要的组成部分得到了越来越广泛的研究与应用。基于磁光效应制成的磁光隔离器和环行器是目前应用最为广泛的非互易性器件,为了将非互易性器件整块集成在硅片上,需制备性能与块状磁光材料相当的磁光薄膜。在近红外通信波段(1 550 nm),以钇铁石榴石(Y₃Fe₅O₁₂,YIG)为代表的稀土铁石榴石(RIG)具备优良的磁光效应,是最具应用前景的磁光材料之一。研究发现,使用稀土离子对YIG薄膜进行掺杂可以有效改善其磁光性能,尤其是Bi³⁺和Ce³⁺掺杂的YIG表现出巨法拉第效应。本文首先介绍了法拉第效应原理,介绍了三种常见磁光薄膜的生长方法,回顾了近年来的主要研究成果,介绍了磁光薄膜在光隔离器和环行器中的应用,最后对磁光薄膜的未来发展趋势进行了展望。     

Role of Bipolar Pulsed DBD on the Growth of <Emphasis Type="Italic">Microcystis aeruginosa</Emphasis> in Three-Phase Discharge Plasma Reactor

Algae in drinking water supplies often bring about impact on the water treatment. In this study, a bipolar pulsed dielectric barrier discharge system in three-phase discharge plasma reactor was constructed for investigating its ability to control excessive growth of cyanobacteria, Microcystis aeruginosa. Experimental results show there was almost no change in optical density immediately after the interruption of electrical discharge, but the decreasing trend of optical density, cell density and chlorophyll-a content was obvious during the incubation period, indicating a significant residual effect of electrical discharge process on the algal growth inhibition. Scanning electron microscopy investigation of algae revealed surface damage, apparent leakage of intracellular contents and pores formed after electrical discharge process, which showed that algal cells had no potential to survive and grow. Compared with the control sample, it was observed that electrical discharge on the algal extracellular products has almost no residual effect and the growth rate of algae slightly decreased before three days storage. Hydrogen peroxide was produced by electrical discharge in the μM level and showed a first-order decay. But at such level, the external addition of hydrogen peroxide alone is not likely to cause the residual effect. These results implicated that the growth inhibition of M. aeruginosa was mainly caused by electrical discharge process, and it made the algal cells lose ability to survive, demonstrating the considerable potential of such an alternative process for efficient water purification.     

The pentacene films on the glass/ITO surface: structure and optical properties

Abstract

The structure, morphology and optical transmittance spectra of pentacene films on the (glass/ITO) surface were studied. The films were grown by two methods - the thermal vacuum deposition (TVD) and pulsed laser deposition (PLD). The electron diffraction pattern from thermally deposited pentacene films confirms their polycrystalline structure while the diffraction pattern of PLD-coated layers has a diffusion character. The results obtained showed that layers deposited by the TVD method has an optical spectrum that is characteristic for the pentacene film in contrary to the layers deposited by the PLD method. It is found a sensitivity of the optical transmittance of pentacene films to the ammonia action, which may be used for development the optical gas sensor.     

固相萃取-离子色谱-积分脉冲安培法测定人血清中游离氨基酸

比较了磺基水杨酸和无水甲醇沉淀人血清中蛋白质的效果,优化了国产732型阳离子交换树脂进行固相萃取净化的条件和Dionex-600离子色谱分析系统的梯度淋洗条件。用该离子色谱仪检测了谷氨酰胺等14种氨基酸,结果表明,峰面积-浓度的校正曲线的相关系数为0.9900~0.9995,检出限为0.02~0.59mg/L;峰面积的相对标准偏差为1.9%~10.4%;回收率为80.6%~114.8%。     

高效阴离子交换色谱分离-脉冲安培检测法测定烟草料液中的糖、糖醇和醇类化合物

建立了高效阴离子交换色谱分离-脉冲安培检测法测定烟草料液中的糖、糖醇以及醇类化合物的方法。以NaOH为淋洗液,在CarboPac MA1阴离子交换柱上等度分离了肌醇、甘油、丙二醇、半乳糖醇、木糖醇、山梨醇、甘露醇、葡萄糖、果糖、蔗糖、甘露糖和半乳糖等12种化合物。对影响分离和检测的条件进行了优化,并在此优化条件下分析了烟草料液中的糖、糖醇以及醇类化合物。12种化合物的检出限为2.0~216μg/L(25.0μL进样,以3倍信噪比计算检出限)。12种化合物浓度为1~5mg/L的标准溶液连续7次进样的RSD为0.7%~4.3%。方法对烟草料液中12种化合物的加标回收率为80%~108%。方法灵敏、高效、简便、快捷。     

Spectral shifts and spectral switches in diffraction of ultrashort pulsed beams passing through a circular aperture

Based on the Fourier transform method, a simple closed-form expression for the on-axis power spectrum of ultrashort Gaussian pulsed beams in diffraction at a circular aperture is derived, which permits us to study spectral changes both analytically and numerically. It is shown that for diffracted pulsed beams there exist spectral red and blue shifts, spectral narrowing, and spectral switches in the near field. The aperture diffraction plays an important role in spectral switching, but both the truncation parameter and bandwidth (or equally, Fourier transform limited pulse duration) affect the behavior of spectral switches.     

双脉冲电子束源实验研究

利用现有2MeV直线感应注入器,通过改造,将其次级功率源和8个感应腔分成2组,使之交替工作,建立了一台双脉冲电子束源。二极管电压脉冲幅度达到1MeV,电子束脉冲持续时间为120ns,脉冲间隔可以根据需要在100~500ns间进行调节。实验结果表明：该双脉冲电子束源可以产生双脉冲电子束,其电压幅度差值小于2%,束流可达3kA,并且工作稳定,利用该装置可以进行多脉冲二极管物理和天鹅绒多脉冲发射特性实验研究。     

用自积分式罗氏线圈测量纳秒级高压脉冲电流

介绍了测量纳秒级高压脉冲大电流信号用的自积分式罗氏线圈的优点、用途、基本原理及设计。利用传输理论分析了它的信号响应及干扰。对研制出的罗氏线圈进行了标定。设计的线圈的灵敏度在1.4mV/A,可以采用的上升时间小于2ns,脉宽小于200ns,电流信号10A～40kA。自积分式罗氏线圈广泛用于脉冲功率技术中的快过程大电流测量。     

Preparation and tribological properties of DLC/Ti filmby pulsed laser arc deposition

This paper reports that DLC (diamond like carbon)/Ti and DLC films were prepared by using pulsed laser arc deposition. R-ray diffraction, Auger electron spectroscopy, Raman spectroscopy, atomic force microscopy, nanoindenter, spectroscopic ellipsometer, surface profiler and micro-tribometer were employed to study the structure and tribological properties of DLC/Ti and DLC films. The results show that DLC/Ti film, with $I(D)/I(G)$ 0.28 and corresponding to 76{\%} sp$^{3}$ content calculated by Raman spectroscopy, uniform chemical composition along depth direction, 98 at{\%} content of carbon, hardness 8.2 GPa and Young's modulus 110.5 GPa, compressive stress 6.579 GPa, thickness 46~nm, coefficient of friction 0.08, and critical load 95mN, exhibits excellent mechanical and tribological properties.