选择离子储存技术用于分析气溶胶中的多环芳烃

探讨了气质联用结合选择离子储存技术 (GC/MS/SIS)对大气气溶胶中的多环芳烃 (PAHs)进行定性定量分析的可行性。采集的气溶胶样品经索氏提取、吹氮浓缩后进行 GC/MS/SIS分析 ,结果表明完全满足定性及定量分析要求。该法简化了预处理步骤 ,提高了复杂基体中 PAHs分析的灵敏度。     

蒙成药如达多糖的研究

从蒙成药如达中提取水溶性多糖,硫酸-苯酚法测定其含量。平均回收率为99.8%,RSD为0.94%。GC测定了水溶性多糖的组成为葡萄糖、半乳糖和甘露糖。其摩尔比为:6.33:3.25:1.59。     

I.I. Rabi: The Two Cultures and the Universal Culture of Science

I set forth and discuss I.I. Rabis views on the nature of science and society, focusing specifically on Rabis views on science and government, science and education, and science and religion. I also explore the influence of Rabi and C.P. Snow on each other. In the 1960s, Rabi set forth his mature and boldest positions, advocating science as the center of education and science as the replacement for religion. His positions culminate in science as the universal culture. I highlight Rabi not only as a scientist and public servant, but also as a public intellectual actively engaged with and connected to major issues of his time.Michael A. Day is Professor of Physics at Lebanon Valley College. He holds doctorates in both physics and philosophy.     

AC发泡剂中一种助发泡剂的鉴定

目前国内外通过在AC发泡剂中添加各种促进剂进而获得改性AC的方法已成为一种趋势。添加何种改性剂无疑是研究改性AC的关键。因此定性分析AC中的改性剂,对改性AC的研发将有极大的帮助。文章应用由作者在Vibrational Spectroscopy上首次提出的薄层色谱显微傅里叶红外联用的方法,鉴定出某改性AC中一种罕见添加剂的官能团,结合元素分析及化学物性分析等,推测出此添加剂的结构。通过对推测物质碎裂机理的解释和未知添加剂质谱图的分析,进一部验证了该添加剂为所推测的物质。这种鉴定方法同样适用于AC中其他无标准图谱的改性剂分析。     

三维电子散斑干涉技术及其应用研究

通过大错位剪切镜和一作为参考物的压电陶瓷相移器将三个电子散斑干涉系统组成一新的三维电子散斑干涉系统。利用该系统，结合相移技术和图像处理技术，可得到独立的位移场(u,v和w场)。该技术的特点是用三个激光器作为光源，一个压电陶瓷相移器产生参考光并实现相移，CCD摄像机前放置大错位剪切镜以使物光和参考光产生干涉。将该技术应用到柴油发动机零部件测量上，得到了主轴承孔周的三维位移场。     

Finite Lifetime Eigenfunctions of Coupled Systems of Harmonic Oscillators

We consider a vector-valued Hermite-type basis for which the eigenvalue problem associated to the operator H _A,B :=B(; _x ² )+Ax ² acting on becomes a three-terms recurrence. Here A and B are 2 × 2 constant positive definite matrices. Our main result provides an explicit characterization of the eigenvectors of H _A,B that lie in the span of the first four elements of this basis when AB BA.This revised version was published online in March 2005 with corrections to the cover date.     

Charged fluid distribution in higher dimensional spheroidal space-time

A general solution of Einstein field equations corresponding to a charged fluid distribution on the background of higher dimensional spheroidal space-time is obtained. The solution generates several known solutions for superdense star having spheroidal space-time geometry. Formerly V. Regional College of Engineering     

共沸蒸馏GC/MS测定非卤代挥发性有机物的方法研究

讨论了用共沸蒸馏法浓缩处理水、土壤、固废样品或其萃取液中不易吹除、具挥发性、且易溶于水的非卤代挥发性有机物,并用气相色谱质谱联用仪定性定量的方法.     

用毛细管气相色谱法测定氢氯噻嗪中甲醛的残留量

建立了采用直接进样毛细管气相色谱法测定氢氯噻嗪中甲醛残留量的方法。色谱柱为DB-1石英毛细管柱,采用程序升温,载气为氮气,检测器为FID,以DMF为溶剂。在上述色谱条件下,甲醛的线性范围为100—900mg/L,r=0.9999;平均加样回收率为100.34%,相对标准偏差RSD为1.56%。本方法简便、专属性强、准确度高,可用于测定原料药中甲醛的残留量。