川芎挥发油化学成分GC/MS分析

使用水蒸气蒸馏法提取川芎中的挥发油,利用气相色谱-质谱联用技术对川芎化学成分进行分离鉴定,采用色谱峰面积归一化法确定各成分的相对含量。分析结果表明,共分离出53种组分,鉴定了其中的34个组分,占挥发油组分总量的64.42%。     

火焰原子吸收光谱法测定马齿苋叶中的微量元素Mg和Ca

采用湿法消解样品,硝酸镧消除相关干扰,校准曲线法在同一溶液中利用空气-乙炔火焰原子吸收光谱法测定马齿苋叶中Mg、Ca元素的含量。结果表明,马齿苋叶中含有丰富的Mg、Ca元素,平均含量分别为1707.9μg/g和2992.8μg/g,方法的加标回收率在88.2%—105.2%之间,相对标准偏差在0.56%—0.93%之间,测定结果准确可靠。     

基于贝叶斯推理的像元内部端元选择模型

提出了利用贝叶斯推理选择混合像元内端元的模型.考虑到端元光谱的不确定性,基于贝叶斯推理和线性光谱混合模型得到了像元内端元集合的后验概率表达式.在获得端元共存的先验知识基础上,结合端元光谱的正态分布函数,通过最大后验概率得到最佳的端元集合.通过对包含147431个像元的ETM+影像试验表明,相对于IDRISI软件的MRES和PG算法,该算法可削减至少70%的冗余端元,使端元选择错误导致的分解误差降低至少28%.结果表明,由于充分考虑端元光谱的小确定性和端元的共存性,通过贝叶斯推理可以大幅度提高端元选择的正确率,从而改善混合像元的分解精度.     

Vacuum Outer-Gap Structure in Pulsar Outer Magnetospheres

We study the vacuum outer-gap structure in the outer magnetosphere of rotation-powered pulsars by considering the limit of trans-field height through a pair production process. In this case, the trans-field height is limited by the photon-photon pair production process and the outer boundary of the outer gap can be extended outside the light cylinder. By solving self-consistently the Poisson equation for electrical potential and the Boltzmann equations of electrons/positrons and γ-rays in a vacuum outer gap for the parameters of Vela pulsar, we obtain an approximate geometry of the outer gap, i.e. the trans-field height is limited by the pair-production process and increases with the radial distance to the star and the width of the outer gap starts at the inner boundary （near the null charge surface） and ends at the outer boundary which locates inside or outside the light cylinder depending on the inclination angle.     

肉豆蔻化学成分的GC-MS研究

用气相色谱-质谱联用技术对肉豆蔻的化学成分进行了研究。共鉴定出41种成分,占总分离成分的78.85%,其中4-甲氧基-6-(2-丙烯基)-1,3-苯并二恶茂含量最高,占总分离成分的20.72%。     

光的折射定律(Snell定律)演示实验装置

基于光子动量在不同媒质分界面上沿分界面方向守恒原理,制作了光的折射定律演示装置.使用该装置可演示入射角连续变化,折射角也自动遵循折射定律相应变化.本文介绍了该演示装置的原理、构造及使用方法.     

Rotation, scaling, and translation invariant local watermarking technique with Krawtchouk moments

A rotation, scaling, and translation invariant local watermarking is proposed with one or two Krawtchouk moment(s) of the original to estimate the geometric distortion parameters including rotation angle, scaling factor, and translation parameter. Krawtchouk moments can be used as private key of watermark extractor. Watermark is inserted into perceptually significant Krawtchouk moments of original, and watermark based on Krawtchouk moments is local. Independent component analysis (ICA) is utilized to extract watermark blindly. Experimental results show that this method has a good robustness against distortions preformed by watermark benchmark—Stirmark.     

有机锗(锗-132)的示差脉冲极谱研究

用示差脉冲极谱法,在pH1.30H_2SO_4和3,4-二羟基苯甲醛(DHB)底液中,获得了有机锗(Ge-132)和无机锗Ge(Ⅳ)二个配位吸附极谱波,波峰分别为E_P2-0.62V和E_pl=-0.47V(υs.AgCI/Ag),Ge-132浓度在2.6×10_(-5)～3.1×10_（-3）mol/L范围内,Ge(Ⅳ)浓度在 3.1×10_（-5）～2.1×10_（-4）mol/L范围内分别与峰电流星线性关系.利用该示差脉冲极谱法可同时测定Ge-132和Ge(Ⅳ),用于有机锗营养口服液中Ge-132和Ge(Ⅳ)的测定结果满意.还探讨了Ge-132极谱波的性质,测定了有关动力学参数.     

量子微腔中原子大质心动量转移问题

讨论了双模量子环形微腔中二能级原子与腔场相互作用的动力学问题,分析了量子微腔的双模腔场和原子质心交换动量的过程。通过控制双模光场的光子数,得到了原子质心运动可同时吸收或发射多个光子的结论,从而可以实现较大的原子质心动量转移过程,使原子分束效应更为显著。     

甲苯胺蓝动力学分光光度法测定药品中的抗坏血酸

基于在磷酸介质中,抗坏血酸可学原甲苯胺蓝并使其退色反应,建立了一和睦这分光光度法测定了抗坏血酸的新方法。该方法线性范围０－１２０μｇ／ｍＬ,检出限２５μｇ／ｍＬ。用于药品中抗坏血酸的测定,并进行回收试验,回收率在８７－９８％。