双波长双指示剂催化光度法测定中药材中的痕量铜

文章研究在硫酸介质中,利用铜催化过氧化氢氧化甲基橙和亮绿褪色的反应体系.探讨该褪色指示反应的最佳实验条件,在此基础上建立高灵敏度测定痕量铜的动力学分析新方法.通过对该反应催化体系和非催化体系吸光度的测定,确定该体系的最大吸收峰位于波长510 nm和640 nm处.工作曲线的线性范围:0.100~2.00μg/25mL.检出限:3.64×10-9g/mL,相对标准偏差:1.2%.本方法体系稳定,灵敏度高,选择性好,用于亳州道地药材中痕量铜的测定,结果较为满意.     

西文操作系统下汉字显示技术

本文介绍了在西文ＤＯＳ下直接显示汉字的原理，给出了点阵汉字、美术汉字、工程汉字的显示方法     

混合工质HFC152a/HCFC22压焓图及饱和性质表

根据现有的ＨＦＣ１５２ａ／ＨＣＦＣ２２的泡、露点实验数据,拟合出适用于计算其热力学性质的Ｐｅｎｇ－Ｒｏｂｉｎｓｏｎ方程的二元交相作用系数,并由此制作了混合工质ＨＦＣ１５２ａ／ＨＣＦＣ２２（质量分数为８５％／１５％）的压焓主饱和性质表,在以温度和压力的基准的饱和性质表中,列出了温度在－８０℃－１００℃,压力在１００ｋＰａ－３ＭＰａ之间,该混合工质的饱和热力性质,图和表所示的热力性质包括温度,压力,比     

二氰胺基和4,5-二氮芴-9-酮的铜、钴和镍配合物的合成及光谱研究

合成了三个二氰胺基[N(CN)2]-及4,5-二氮芴-9-酮(AFO)配合物Cu(AFO)2[N(CN)2]2·H2O(1)、Co(AFO)[N(CN)2]2·1/2H2O(2)和Ni(AFO)[N(CN)2]2·1/2H2O(3),确定了其组成,进行了红外光谱研究.     

叠氮化钠联合卤化铵燃烧合成氮化硅粉体

采用叠氮化钠作为固态氮化剂,同时以卤化铵作为活性稀释剂,通过对燃烧温度特征曲线和燃烧产物相组成的分析,研究了两者的协同作用对于燃烧合成氮化硅粉体的影响. 研究结果表明:叠氮化钠和卤化铵的热分解可增加硅粉内部孔隙率和氮气渗透性,也能为Si-N反应提供内部氮源. 叠氮化钠和卤化铵均可作为Si-N反应的催化剂,可促进硅粉向氮化硅的氮化转变. 叠氮化钠联合卤化铵的使用能够有效地降低燃烧温度,使燃烧反应以低温模式进行,有利于α-Si3N4的生成. 随着反应物中叠氮化钠含量的增多,燃烧产物中α相氮化硅含量也相应地有所提高.     

氨基化纳米二氧化钛的热稳定性分析

以基于赖氨酸原位修饰法制备的氨基化纳米二氧化钛进行不同煅烧温度下的热稳定性分析。用 SEM和FT-IR表征手段分析了在不同煅烧温度下氨基化纳米二氧化钛的形貌及结构,用 DTA-TG测量了它们的热失重曲线。结果表明：500℃以下的煅烧不会对材料的形貌结构产生太大的影响,氨基基团仍然存在;并且经过300℃的高温处理后,它的稳定性也有一定程度的提高。     

薄板单元新的质量矩阵及其应用

为了使TRUNC元能用来分析薄板动力问题，用作者所提出的新列式方法推导出该单元的两种质量矩阵。文中算例的计算结果表明，用TRUNC元和这两种新的质量矩阵分析薄板动力问题，也具有高的精度和计算效率。     

公务员招聘问题的模型分析

介绍了公务员招聘问题的数学模型的建立与应用,并对招聘公务员提出了建议。     

Reactions Between Humic Acid Solutions and Excessive ClO2 or Cl2

Reactions between humic acid solutions and excessive ClO2 or Cl2 have been investigated. Under various experimental conditions, the removal efficiency of TOC, UV254 and A140 from humic acid solutions were examined. The relationship between the removal efficiency and the consumption of ClO2 or Cl2 was discussed. The results showed that the maximum demand of ClO2 was 2.19 mg/mg TOC for the humic acid solution under the experimental conditions, and that of Cl2 was 1.88 mg/mg TOC. The variation tendency of ClO2 consumption was similar to that of Cl2. TOC of humic acid solutions decreased 15.2% and 15.6% after the reaction with ClO2 or Cl2 respectively. Under the experimental conditions, 21.4% of unsaturated bonds and 52.8% of humic acid color were removed by ClO2 in 168 h. As for Cl2, removal efficiency of unsaturated bonds and humic acid color were 16.8% and 41.7% respectively. Larger molecules from humic acid were oxidized to smaller molecules by ClO2 and Cl2. Higher oxidation potential of ClO2 than that of Cl2 was also indicated by variation of UV254/A410 ratios. The similar tendency, that exhibited faster variation in the initial 24 h, existed for all the research factors.     

CiLin Expansion and Its Application to Word Sense Disambiguation

40000 new entries are added to CiLin in knowledge engineering. Statistics are presented about the sense ambiguity of Chinese words in CiLin. An automatic solution is proposed for the problem of Chinese sense disambiguation, which utilizes the heuristics of part-of-speech tagging and Naive Bayesy classification based on a partially disambiguated corpus.