李代数的Poisson代数结构Ⅱ

本文研究民具有无限维中心的Toroidal李代数.通过利用其明确的生成元,确定了其上所有的非交换Poisson代数结构,从而推广了有限维中心的情形.     

用多极理论分析圆桩对称微波谐振腔

用多极理论计算具有复杂几何形状、圆柱对称微波腔的谐振频率,推导出用多极理论计算圆柱对称微波腔谐振频率的本征值方程。三个工程实例的计算结果表明,用多极理论计算圆柱对称微波腔谐振频率,不仅具有较高的计算精度,而且可以很方便地应用于复杂几何形状圆柱对称微波腔工程问题的设计与计算,多极理论是计算圆柱对称微波腔谐振频率的一种有效方法。     

Optimization of the Acoustic Pressure Distribution in a Resonant Photoacoustic Cell

The size of a cylindrical photoacoustic cell with suitable size was selected so that the resonant frequency of the first radial mode was equal to that of a longitudinal higher mode. By maintaining two thin coaxial tubes at each end, a enhanced photoacoustic cell was constructed with two tubes of 1/2 and 1/4 of the wavelength. In this enhanced photoacoustie cell, both the first radial resonance and the higher longitudinal resonance were excited adequately. Coupling of two acoustic modes makes the acoustic energy concentrating in the middle of the cell. The surface loss was decreased, the acoustic quality factor and pressure amplitude increased obviously as compared with conventional cylindrical cell.     

拉曼光谱在宝玉石鉴定中的应用

:利用拉曼光谱鉴定宝石越来越受到宝石学界的关注。本文测定了许多宝石的拉曼光谱 ,其中包括宝石、玉石、人造宝石和一些贵重宝石的代用品。这些谱图可以作为宝石鉴定的标准对照谱。文中还讨论了宝石拉曼光谱鉴定的一些特点     

量子Heisenberg薄膜临界点的变分累积展开研究

采用变分累积展开法研究了超立方格点上任意自旋的量子Heisenberg薄膜的临界点.从自由能的解析性质出发,原则上能计算作为多层膜层数l函数的临界约化温度θ(n)(l)到任意累积展开级次n.给出了θ(n)(l)的前三级解析表达式和数值结果,并对结果作了分析和讨论. 关键词：     

Robust Scheme for Long-Distance Teleportation of an Unknown Atomic State

A scheme is presented for the long-distance teleportation of an unknown atomic state between two separated cavities. The scheme is based on the Raman coupling and cavity decay. In the scheme, the effective atom-cavity coupling strength is much smaller than the cavity decay rate and thus cavities of high quality factor are unnecesssary.     

氢化物发生-原子荧光法测定中药中痕量汞

应用AFS-2202a型双道原子荧光分光光度计和断续流动的氢化物发生技术,采用HNO₃-H₂O₂体系和聚四氟乙烯高压釜消解中药样品,并优化了实验条件,建立了氢化物发生-原子荧光法测定中药中痕量汞。同时,研究了硼氢化钾浓度,光电管负高压,灯电流,原子化器高度,屏蔽气和载气流量等因素对测定结果的影响。在选定实验条件下,汞的检出限为0.021 μg·L-1, 桃叶(GBW08501)验证结果与推荐值一致,6次测定结果相对标准偏差为0.34%。此方法简便、快速、灵敏、准确,以工作曲线法和加入作图法对照,对于实际中药样品的测定得到了满意的结果。     

HPLC法测定硫普罗宁氯化钠注射液中硫普罗宁的含量

用十八烷基硅烷键合硅胶作为填充剂;流动相∶甲醇-水(5∶95),用磷酸调pH值至2.5;流速:1.0mL/min。检测波长205nm。HPLC法测定硫普罗宁氯化钠注射液中硫普罗宁的含量,硫普罗宁0.048—0.112mg/mL范围内线性关系良好,加样回收率为99.8%,RSD%为0.3%(n=9)。该方法简便、灵敏、准确。     

双酚A人工抗原的光谱表征及免疫鉴定研究

双酚A(bisphenol A,BPA)是一种酚类环境雌激素,即使极低剂量残留对人类健康也有危害。为了建立其简单快速并适应现场检测的免疫分析方法,必须先合成它的人工抗原并进行鉴定。通过对双酚A进行结构修饰,用碳二亚胺将结构修饰了的双酚A与牛血清蛋白相偶联,经透析得到纯的双酚A人工抗原并冷冻干燥备用。然后用紫外光谱、红外光谱和免疫方法对人工抗原进行鉴定。结果表明,合成的人工抗原紫外光谱图中具有蛋白质和双酚A的特征吸收峰;人工抗原红外光谱图中呈现双酚A和牛血清蛋白的红外特征吸收峰;通过竞争ELISA试验表明用合成的人工抗原免疫的Balb/c小鼠血清中产生了双酚A的抗体。三种方法综合鉴定结果表明双酚A人工抗原合成成功,该人工抗原可以进一步用于制备抗双酚A的单克隆抗体。     

Interaction among Cadmium Sulfide Nanoparticles, Acridine Orange, and Deoxyribonucleic Acid in Fluorescence Spectra and a Method for Deoxyribonucleic Acid Determination

Some studies on quantum dots (QD) as donors that enhance the fluorescence of a dye as an acceptor through fluorescence resonance energy transfer (FRET) have been reported. However, in the present work we discovered that CdS quantum dots sharply quenched the fluorescence of acridine orange (AO). Also, DNA enhanced the fluorescent signals of AO quenched by CdS. The extents of enhancement were in good proportion to the DNA concentrations. Based on this, a sensitive method was employed to determine DNA with both good selectivity and sensitivity. The calibration curve was linear over 60-4,000 ng mL(-1) and the determination limit (3sigma) was 4.39 ng mL(-1).