消解方法对ICP-MS法测定人发中微量元素含量的影响

本文采用三种不同酸体系和两种加热方式组合成五种消解方法，对人发标准物质(GBW07601)进行消解，以ICP-MS作为分析技术测定其微量元素的含量，并对其方法、结果及影响因素进行了相应的讨论。     

河台韧性剪切带金矿床微量元素稀土元素地球化学特征

河台金矿床赋存于河台韧性剪切带中,矿体严格受剪切带控制,矿石类型以糜棱岩型矿石为主,并有少量石英脉型矿石。矿床以富集Au,Ag,Se,S,As,Bi,Cu,Sb的元素组合为特征,Au/ag比值在2～10,同时W,Sn,U,Pb也有一定程度的富集。亲铁元素Sc,Ti,V,Cr,Mn,Co,Ni出现亏损;大离子亲石元素Rb,Cs发生富集,而sr、Ba、Y等出现亏损,同时REE元素也出现亏损,稀土元素组成以轻稀土富集为特征,∑LREE/∑HREE为5.1~11.53,∑REE在54.49×10-6～137.45×10-6之间,出现明显的Eu亏损,δEu在0.52~0.66之间。根据特征富集元素组合及元素含量向深部的变化趋势,推测矿床向深部的延伸仍具有很好的工业前景。     

一族新的非线性发展方程系统及其Hamilton结构

考虑一种新的等谱问题，由此导出一族新的非线性发展方程系统，并利用迹的恒等式建立起这族新系统的双Ｈａｍｉｌｔｏｎ结构     

Oxidative damages to DNA by indoor PM10s: Their relationships with trace element compositions

Plasmid DNA assay and ICP-MS analysis were conducted in order to investigate the bioreactivity of inhalable particles (PM10) and the relationship between bioreactivity and trace element compositions of PM10 in Beijing air. A total of four PM10 samples were carefully selected to represent the indoor and corresponding outdoor environments: one from urban smoker's home, two from non-smoker's homes, and the other from the outdoor. In general, the oxidative damage by indoor PM10 was slightly higher than that of outdoor. Among the four sets of samples, the PM10 from the smoker's home had a lowest TD50 (toxic dose of PM10 causing 50% DNA to be damaged), being 100 μg·mL-1, suggesting the highest bioreactivity. The heavy metals are believed to be the main reason for oxidative damage to plasmid DNA. The ICP-MS analysis combined with the DNA assay showed that the water-soluble zinc levels had better relationship with TD50 values than other elements, implying that water-soluble zinc might play an important role in the damage of DNA. It is concluded that the PM10 in smoker's home had the highest level of water-soluble zinc as well as the lowest TD50 (highest bioreactivity). Iron is considered to be one of the most bioreactive elements, but it will cause little damage to plasmid DNA, probably because iron is mainly in water-insoluble state in Beijing PM10.     

连锁超市保质期商品配货模型及应用

本文根据连锁超市保质期商品销售特点，运用库存控制论中有关理论建立配货模型，并讨论模型的应用及程序实现。对连锁超市应用计算机管理，降低成本，提高利润有参考价值。     

嵌入式光电综合控制系统研究

简要介绍了嵌入式光电综合控制系统的系统组成、硬件结构、软件设计等内容，分析了其设计特点，给出了实现方法。     

刺玫果中营养成分及其讨论

本文测定了刺玫果中的微量元素及含量，也测定了糖和维生素Ｃ的含量，并对其中一些元素和化合物的功能及性质进行了讨论。     

岩体硬性结构面精测及量化处理

介绍了现场硬性结构面精测方法以及在精测资料基础上通过计算机来实现结构面间距、条数、迹长等基本要素的量化及可视化显示 ,分析了结构面基本要素获取过程中有关切割单元长度和切线间距的确定、结构面分布较少及存在大量缓倾结构面时结构面间距的计算等问题。针对这些问题 ,给出了解决方案。结合具体工程实际应用 ,获得了良好的效果。     

阳离子交换预分离--离子色谱法测定低合金钢中痕量硫、磷

通过对离子色谱的淋洗液体系的研究,选择邻苯二甲酸氢盐为流动相,实现了以单柱离子色谱法(IC)同时测定多型体的PO3-4和强保留的SO2-4,SO2-4、PO43-的检出限分别为1 ng/mL、3 ng/mL.研究了Y2X8型树脂的静态及动态阳离子交换性能,考察了在线预分离-IC法测定钢铁中痕量硫、磷的可行性,并以离线预分离-IC法测定了低合金钢中硫、磷,RSD小于11%.     

关于P-反演半群的强P-同余格子格的注记

刻画了P-反演半群上的特征迹为一给定强正规等价关系的最小强P-同余．