青蒿挥发性化学成分分析

用同时蒸馏－萃取装置（ＳＤＥ）提取了青蒿的挥发性物质,用ＧＣ－ＭＳ法分析鉴定出５０种化合物,其中主要成分为醛类（１８．１６％）、酮类（８．２４％）、醇类（１７．３６％）、酯类（１１．０２％）、酸类（７．３１％）、烃及萜类（２５．５８％）、杂环类（１０．３８％）,占总检出量的９８．０５％。     

铊(Ⅰ)-碘化钾-向红菲啰啉络合吸附波的研究

在Ｎａ２Ｂ４Ｏ７－ＮａＯＨ 介质（ｐＨ １０．８）中,可获得灵敏的铊（Ⅰ）－碘化钾－向红菲口罗啉极谱络合吸附还原波,其二阶导数波灵敏度高、波形好,峰电位在－ ０．５８ Ｖ 处（ｖｓ．ＳＣＥ）。波高与铊（Ⅰ）浓度在２．０×１０－ ８～９．０×１０－ ７ ｍ ｏｌ·Ｌ－ １范围内呈线性关系, 检出限１．０×１０－ １０ ｍ ｏｌ·Ｌ－ １。本法用于测定工厂废水中的痕量铊,结果满意。本文还对极谱波的性质和机理进行了研究。     

Solubilities of benzene, toluene and diphenyl in the t-butyl alcohol+water mixtures and hydrophobic interaction

The solubilitices of benzene, toluene and diphenyl in mixed solvents of t-butyl alcohol (TBA) and water at 283.15, 288.15, 293.15 and 298.15 K have been determined by spectrophotometry. The mole fraction of TBA [x (TBA)] in the mixed solvent are 0.000, 0.010, 0.020, 0.030, 0.040, 0.045, 0.050, 0.060, 0.080 and 0.100, respectively. The standard Gibbs energies of solution of benzene, toluene and diphenyl in the mixed solvent have also been calculated based on the solubility data. The hydrophobic interactions (HI) for the pairs of benzene-benzene, methane-benzene and methane-methane in the mixed solvent were calculated and discussed.     

Decomposition of Cyclohexyl-t-butyl-Dimethylammonium Tetraphenylborate: Synthesis and kinetics

A new compound cyclohexyl-t-butyldimethylammonium tetraphenylborate, [C₆H₁₁N(CH₃)₂(C(CH₃)₃)]BPh₄ has been prepared, and its decomposition mechanism was studied by TG. The IR spectra of the products of thermal decomposition were examined at every stage. Kinetic analysis for the first stage of thermal decomposition process was obtained by TG and DTG curves, and kinetic parameters were obtained from the analysis of the TG-DTG curves with integral and differential equations. The most probable kinetic function was suggested by comparison of kinetic parameters.This revised version was published online in November 2005 with corrections to the Cover Date.     

Membrane affinity chromatography for analysis and purification of biopolymers

Summary Affinity columns suitable for HPLC were prepared by immobilization of various ligands of protein A, human IgG, human IgM and pectinase on GMA modified cellulose membrane. The adsorption capacity, affinity efficiency and activity recovery of various IgGs on these affinity columns were measured. It was observed that the length of the coupling arm plays a very important role in affinity efficiency, and the effect of eluent flow-rate on adsorption capacity was very small. The protein A column was exploited for the process monitoring of dog IgG in clinical experiments on immuno-adsorption therapy. A pectinase column was used for the determination of polygalacturonase inhibiting proteins first purified on a hydroxyapatite column. It took only about 2.5 min for analysis at a flow-rate of 1.0 mL min⁻¹. The high speed analysis of biopolymers could be performed at a flow rate of 6.0 mL min⁻¹ within 15 s. Membrane affinity chromatography gives good reproducibility, high efficiency, low column-pressure and is rapid. It can also be used for micro-scale purification of biopolymers.     

烟煤与重质油共处理的研究

煤与重质油的共处理是最有希望实现“由煤制油”的第三代煤液化新工艺之一。我国目前炼油厂每年有四、五千万吨石油渣油产出,只有一小部分用作制氢或合成气的生产原料以及生产沥青或石油焦,其余大部分用于工业燃料［１］。如将减压渣油与煤进行共处理,共同提质,提高其...     

一类非线性边值问题的近似解

运用修正迭代法求出一系列无量纲的特征关系曲线,研究解决非线性本质的积液问题     

红外成像检测中一种新型噪声抑制方法的理论模拟

根据线性微分方程的特点及两个合理的近似,提出了一种新的用计算机辅助去除红外成像检测中高功率噪声的方法,仿真结果表明方法有良好的抑制噪声效果。     

InCl分子C1Π1态光谱研究

采用激光诱导荧光技术对InCl分子C1Π1→X1Σ+荧光光谱进行了分析和归属, 在发射谱中探测到ν′=1向下的跃迁, 证明C态预离解只能发生在ν′=1之上。 并对C1Π1→X1Σ+的荧光衰变曲线进行了观测, 得到InCl分子C1Π1(ν′=1)态的无碰撞辐射寿命τ0≈11 ns及电子跃迁矩|Re|2≈5.95D2。     

Formation and crystal structure of metallic inclusions in a HPHT as-grown diamond single crystal

One of the most important characteristics associated with crystal growth technology is the entrapment of inclusions by the growing crystal. Diamond single crystals prepared under high temperature-high pressure (HPHT) usually contain metallic inclusions. In the present paper, metallic inclusions in a diamond grown from a Fe-Ni-C system using the HPHT method have been, for the first time, systematically examined by transmission electron microscopy (TEM). Energy dispersive X-ray spectrometry (EDS) , combined with selected area electron diffraction (SAD) patterns, has been used to identify the chemical composition and crystal structure of the metallic inclusions. The metallic inclusions were found to be composed mainly of cubic γ-(FeNi), face-centered cubic (FeNi)₂₃C₆, ortho-rhombic Fe₃C and hexagonal Ni₃C, which may have been formed through the entrapment of molten catalyst by the growth front or through reaction of the trapped melt with contaminants in the diamond. Received: 19 June 2000 / Accepted: 21 June 2000 / Published online: 16 August 2000