Local spatial transformations and local observables

Traditionally spatial transformations such as translations and rotations are formulated in terms of transformations of the entire spatial space. In other words, transformations are taken automatically to be of a global nature. This paper investigates a local approach to spatial transformations; local transformations lead naturally to local observables in quantum mechanics.     

积分方程的ε复杂性

本文考虑积分方程的ε复杂性问题.问题的ε复杂性是在误差不超过ε的前提下解决问题所需的最小成本.对某些具各向异性核与自由项的第二类Fredholm方程,求得了ε复杂性的精确阶.同时,找到了解决该问题具最小成本的算法.     

ASYMPTOTIC APPROXIMATION METHOD AND ITS CONVERGENCE ON SEMI-INFINITE PROGRAMMING

The aim of this article is to discuss an asymptotic approximation model and its convergence for the minimax semi-infinite programming problem. An asymptotic surrogate constraints method for the minimax semi-infinite programming problem is presented by making use of two general discrete approximation methods. Simultaneously, the consistence and the epi-convergence of the asymptotic approximation problem are discussed.     

原子吸收光谱法测定铬基合金中钒

本文研究了用原子吸收光谱法，在笑气－乙炔火焰中，测定钒的最佳条件，不用任何分离手段，以铝盐做干扰抑制剂，消除铬，镍对测定钒的干扰，西方法用于铬基合金中钒的测定，方法简单准确，具有实用意义。     

Detection of Anti-Ulcer Drugs and Their Metabolites in Horse Urine by Liquid Chromatography – Mass Spectrometry

This paper describes a convenient method for the extraction and detection of eight anti-ulcer drugs simultaneously in horse urine, a relatively complex and viscous matrix, using a single-step liquid-liquid extraction followed by high-performance liquid chromatography – mass spectrometry (LC-MS). Anti-ulcer drugs were isolated from horse urine by salting out and liquid-liquid extraction. Detection of these drugs at concentrations below 1 ng mL^?1 could be achieved using LC-MS-MS in the positive atmospheric pressure chemical ionisation (APCI) mode. The above analysis was also extended to elimination studies of horses administered with ranitidine and omeprazole. The urinary elimination data of these two drugs suggest that ranitidine was eliminated from horse urine at a much slower rate than omeprazole. In addition, three ranitidine metabolites and six omeprazole metabolites were identified for the first time in equine urine samples.     

Pt对Mo基催化剂还原-硫化过程的影响

采用脉冲硫化、连续硫化、程序升温还原、程序升温及程序降温电导及X射线衍射等方法研究了贵金属Pt对MoO3催化剂还原-流化过程的影响及Pt对MOS2配位不饱和活性中心形成的影响．结果表明，Pt担载或在MoO3上可以促进MoO3的还原-硫化，使MoO3的还原-硫化温度大大降低Pt担载在MoSw上可促进MoS2的部分还原形成配位不饱和的钼中心     

氢化物发生电感耦合等离子体原子发射光谱同时测定纯铜中氢化物和非氢化物形成元素

用新型氢化物发生喇叭口Ⅱ型同心雾化器替代Meinhard同心雾化器，溶液雾化为气溶胶和氢化物发生反应生成氢化物气体就可以在雾化系统中同时进行，选用L-巯基丙氨酸(L-cysteine)和硫脲(thiourea)作为基体铜的掩蔽剂，无需分离基体铜，实现了电感耦合等离子体原子发射光谱(ICP-AES)同时测定纯铜样品中氢化物和非氢化物形成元素的目的。研究了酸度、NaBH4的浓度、载气流速及清洗时间对氢化物形成元素的影响，考察了铜基体对氢化物形成元素的化学干扰情况。用本方法测定了纯铜标准样品(NIST SRM400)，结果令人满意。在1000mg/L纯铜样品溶液中，其氢化物形成元素As、Bi、Sb、Sn、Se和Te的检出限分别为0．08、0．15、0．10、0．17、0．21和0．23μg／L。     

聚-N-乙烯基咔唑和2,4,7-三硝基-9-芴酮电荷转移复合物的稳定态光电导

<正> 聚-N-乙烯基咔唑(PVCz)和2,4,7-三硝基-9-芴酮(TNF)电荷转移复合物(CTC)是良好的有机光导体,已应用于静电复印和全息照相技术,该体系的载流子产生、载流子迁移及载流子复合等已进行过许多研究。而关于该体系的光导作用光谱仅有Schaffert和Lardon用表面电荷衰减法测量过,光敏范围扩展到可见光区。本文     

一种模拟沸石分子筛扩散反应的Monte Carlo方法

在考虑了沸石分子筛中吸附、脱附、扩散和反应的特点的基础上，发展了一种模拟沸石分子筛中扩菜反应的ＭｏｎｔｅＣａｒｌｏ方法。用Ｌａｎｇｍｕｉｒ吸附等温式验证了该方法的合理性，并证明了轰击频率λ代表了反应物气相压力，而吸附、脱附几率之比即为吸附平衡常数。同时，通过改变轰击频率λ和反应几率Ｐｔ，得到了吸附等温线和有效因子随Ｔｈｉｅｌｅ模数变化的曲线。     

水中铬污染治理的研究进展

综述了水中铬污染治理的研究进展,包括物理法、物理化学法、化学法、电化学法和生物处理法,并分别评述了各种处理方法的优缺点,提出了未来含铬废水治理的发展方向。