2-甲基-2-己醇制备实验中合成产物的GC/MS分析

建立了快速检测教学实验中2-甲基-2-己醇合成实验的产物纯度及主要杂质的GC/MS分析方法。实验采用强极性石英毛细管柱,程序升温法分离样品,进行MS检测分析。采集各个成分的色谱、质谱信息,并与对照品的保留时间和质谱图或与标准谱图库中的谱图进行对比,确定杂质的结构。在所建立的条件下,2-甲基-2-己醇及其杂质分离良好,检测出7个杂质,同时利用归一化法确定产品的纯度。结果证明,所建立的分析方法能有效地分离分析2-甲基-2-己醇合成产物,为该实验提供了纯度等重要数据,同时也为该教学实验的优化改进提供了参考依据。     

生物絮凝剂应用于松花江水处理的试验研究

该实验以生物絮凝剂为水处理材料,以松花江的水源水为被处理对象,将生物絮凝剂应用到动态流混凝沉淀试验.通过絮凝率验证絮凝剂应用于松花江水的处理效果,絮凝率达到85%,以及生物絮凝剂对浊度和色度有良好的去除效果,分别达到87%和70%,并且UV254去除率达到32%.同时,对松花江的水源水和絮凝后的沉降水进行色谱-质谱联机分析（GC/MS）,比较其中有机物的变化,结果显示,松花江原水中含有邻苯二甲酸二甲酯、邻苯二甲酸二乙酯和硝基苯等优先控制污染物被生物絮凝剂有效去除.     

A study of stearyl alcohol bloom on Dan Hill PVC dolls and the influence of temperature

A study was conducted to investigate white bloom found on more than 130 polyvinyl chloride (PVC) dolls from the 1980s and 1990s produced by the Danish factory Dan Hill Plast A/S. The bloom was discovered on the dolls after 10 years of storage in a climate controlled facility with average temperature at 11–12°C and a relative humidity at 50?±?5%. Analysis of the dolls and the bloom was carried out using Fourier transform infrared spectroscopy, which revealed that the bloom consisted primarily of stearyl alcohol. Subsequent analysis with gas chromatography–mass spectrometry showed a minor presence of cetyl alcohol. It is proposed that the alcohol had been added as a lubricant to aid flow during processing. The stearyl alcohol was almost completely reabsorbed into the PVC dolls following one month storage at room temperature, suggesting that low temperature storage played a decisive role in the appearance of the bloom. It is likely that a decrease in temperature has led to a decrease in compatibility of the stearyl alcohol in the PVC compound, thus promoting its exudation. This paper also discusses an extreme bloom of white crystals on other PVC dolls of unknown provenance.     

库拉索芦荟中葸醌类化合物的分析与结构鉴定

报道了用紫外光谱法、红外光谱法和MS法对芦荟提取物中的葸醌类化合物进行分析鉴定.利用紫外光谱数据确定其结构骨架;在红外光谱分析中,采用溴化钾压片法测定红外光谱数据提供官能团的有关信息确定可能结构;由EI源质谱仪获得芦荟提取物中的葸醌类化合物的MS数据,并对它的碎片裂解途径和特征离子进行了辅助分析,确定了葸醌类化合物结构.     

Test access to deeply embedded analog terminals within an A/MS SoC

This paper presents a standard scalable and reconfigurable design for testability (SR DfT) in order to increase ac- cessibility to deeply embedded A/MS cores and to limit application of costly off-chip mixed-signal testers. SR DfT is an oscilla- tion-based wrapper compatible with digital embedded core-based SoC test methodologies. The impact of the optimized oscilla- tion-based wrapper design on MS SoC testing is evaluated in two directions: area and test time. Experimental results are presented for several SoCs from the ITC’02 test benchmarks with inclusion of eight analog filters.     

Theoretical study of NO adsorbed on the surface of TiO<Subscript>2</Subscript> (110) cluster model

The chemisorption properties of N¹⁸O adsorption on TiO₂(110) surface were investigated by experimental and theoretical methods. The results of temperature programmed desorption (TPD) indicated that the temperatures of the three desorption peaks of the main N₂ molecules were at (low) temperature of 230 K, 450 K and (high) temperature of 980 K. This meant that N¹⁸O decomposed and recombined during the process of N₂ desorption after N¹⁸O was exposed. Analysis of the stable combination and orbital theory calculation of the surface reaction of NO adsorption on the TiO₂(110) cluster model showed that there was clear preference for the Ti-NO orientation.     

茶叶中10种元素的ICP-MS法分析

报道了采用微波消解法处理样品，运用电感耦合等离子体质谱法（ICP-MS）测定茶叶中10种元素的方法．在优化实验条件下，方法的检出限为2．0-2320μg／g，相对标准偏差为0．86％-10．9％，回收率为80．8％～112．5％．     

校园网中代理服务器的应用

章就如何使用代理服务器实校园网的管理，结合具体的校园网络环境，在简要描述了代理服务器的概念、主要功能及特点，并比较了当前几种代理服务器产品的情况下，给出了在校园网中的代理服务器的具体实现方法及配置过程。     

MS SQL SERVER 6.5的数据分布机制

文章介绍了MS SQL Server6.5对分布式数据库支持的两种方法,在此基础上对这两种方法做了比较并分析了采用何种方法进行数据分布的因素。     

液相色谱-电喷雾电离质谱法及其应用

本文简要介绍液相色谱 -电喷雾电离质谱联用 (LC/ESIMS)的电喷雾电离 (ESI)接口技术 ,并对其在环境和生物学 (生物有机和基因工程 )方面的应用作一评述 .