Peculiar features of application of pH gradients formed in borate buffer with a polyhydroxy compound for separation of proteins in a free-flow electrophoretic apparatus

The use of pH gradients in borate buffer with a polyhydroxy compound for separation of proteins in a free-flow electrophoretic apparatus is outlined. The composition of the pH gradients, the free-flow apparatus design and its operation, and the main causes of failures in the protein separation are considered.     

The determination of trace amounts of heavy metals in waters by a flow-injection system including ion-exchange preconcentration and flame atomic absorption spectrometric detection

The flow-injection system combines on-line ion-exchange preconcentration with atomic absorption spectrometry (a.a.s.) for the determination of traces (μg l^?1) of heavy metals in water samples. Miniature columns packed with 60–100 mesh chelating resin (122) with a salicylic acid functional group are used for preconcentration. A multifunctional rotary sampling valve which incorporated two parallel sampling columns allows sampling, exchange, elution and a.a.s. to be achieved sequentially. The increases in sensitivity for nickel, copper, lead and cadmium were 20–28-fold at a sampling rate of 40 h^?1 with 5-ml samples. Relative standard deviations were 1.5–4.1%. The recoveries of these four metals added to tap, sea and polluted waters were generally satisfactory, except for cadmium in polluted water. The effects of column diameter and elution flow rates on sensitivity are discussed. Possible interferences are described.     

Synthesis, Crystal Structure and Biological Activity of Novel Dichloroacetyl Oxazolidine Herbicide Safeners

A series of novel N-dichloroacetyl oxazolidine herbicide safeners was synthesized and characterized by IR, 1H NMR, 13C NMR, elemental analysis and X-ray diffraction. The preliminary biological test shows that the compounds could protect maize against injury caused by chlorsulfuron to a certain extent.     

基于ARM+DSP索力检测技术的研究与应用

针对斜拉索的基频检测系统进行了研究,提出基于ARM+DSP的拉索振动信号分析检测技术.首先分析了前端振动信号的采集方法和信号处理技术,然后在ARM+DSP平台中进行基频分析算法的实现与优化,最终选取SEED-DEC138工业参考设计平台,并利用双核芯片进行关键模态分析算法的移植优化以及预处理算法的开发,实现了一种新的斜拉索振动信号处理系统.试验结果表明:新系统既能保证较高的检测精度,同时也能保证很好的实时性.     

两指标B值强鞅空间的强原子分解

定义了两指标B值强鞅空间和强原子,利用Banach空间的光滑性建立了两指标B值强鞅空间s~∑α^p的强原子分解定理,应用强原子分解定理证明了一些两指标B值强鞅不等式.     

气体扩散方程解析解及在测定分子间势能的应用

设计了一新颖的分子动理论实验装置,根据求解在约束条件下的气体扩散方程的解析解和气体分子在升华时会对容器底部产生作用力的特点,设计了一种新颖简单的实验器材来测量分子间相互作用的势能,其实验曲线符合理论数据,误差分析后的补偿曲线所得结果可较为精确地与理论结果吻合。本实验常温下即可进行,且精度较高,适合快速材料性质测定及大学物理教学,以解决大学物理演示实验课关于学气体动理论的实验数量较少,且往往只涉及对热学微观过程的宏观模拟,而很少涉及气体动理论的实验,导致学生学习不够深入的问题。有利于学生对分子运动学问题的深入探索。     

FAR-INFRARED AND INFRARED REFLECTIONS OF Tl2Ba2Ca2Cu3O10 FILM

The far-infrared and infrared reflection spectra of Tl₂Ba₂Ca₂Cu₃O₁₀ superconducting film are reported in this paper. It is found there are three sharp reflection edges in both the superconducting and normal states, their positions being near ≈ 150, ≈ 350 and ≈600 cm^-1. We attribute these reflection spectra to the Drude free carriers and a wide mid-infrared absorption band. When the incident angle increases from 7° to 30°, some additional stractures appear in the refiection spectra, which are the A_2u phonon modes vibrating along c-axis.     

Implementing two optimal economical quantum cloning with superconducting quantum interference devices in a cavity

We propose a unified scheme to implement the optimal 1→ 3economical phase-covariant quantum cloning and optimal 1→3 economical real state cloning with superconducting quantum interference devices (SQUIDs) in a cavity.During this process,no transfer of quantum information between the SQUIDs and cavity is required.The cavity field is only virtually excited.The scheme is insensitive to cavity decay.Therefore,the scheme can be experimentally realized in the range of current cavity QED techniques.     

流动注射-氢化物发生原子吸收光谱法测定飞灰、炉渣中的汞和砷

采用流动注射-氢化物发生原子吸收光谱法测定飞灰、炉渣中的汞和砷。在酸性介质中,用硼氢化钾作还原剂,通过载气导入电热石英吸收管,在波长253.7nm和193.7nm处分别对汞、砷进行测定。结果表明,该方法对汞和砷的检出限分别为0.27ng/mL,0.16ng/mL,回收率分别为97.8%、96.7%。该法操作简便、快速、灵敏度高,对实际样品的测定结果令人满意。     

新显色剂 1-[2,3,5-三氮唑偶氮]-2-萘酚的合成及其与钴(Ⅱ)的分光光度研究

合成了新显色剂 1-[2,3,5-三氮唑偶氮]-2-萘酚(简称TZAN ) ,并研究了其性质及与钴显色反应的条件,测定了试剂有关参数.在 pH 6.08 的 HAc-NaAc 介质中,试剂与钴形成红色络合物,其最大吸收波长为 578.2 nm,摩尔络合比 Co2+∶R=1∶2,用双波长测定,表观摩尔吸光系数为 3.15×104 L/mol.cm,钴量在 0～1.0 μg/mL 范围内遵守比耳定律.