职业性铅接触对血压影响的研究

对１１８名铅接触工人及１０８名对照组工人的血压研究发现，在血铅为４４．２６μｇ／ｄＬ时，铅接触工人的收缩压显著高于对照组，分组研究发现，收缩压在级组剂量－反应关系趋势，在血铅３０．２０μｇ／ｄＬ，收缩压显著高于对照组，多元逐步回归分析发现，在控制一些其他影响血压的因素后，铅接触工人的血铅水平与收缩压和舒张压均有剂量－反应关系。     

Synergetic promotion of Ba, Cs and Cl to silver supported catalyst for butadiene epoxidation

Summary Ag/-Al₂O₃ catalysts promoted by Ba, Cs and Cl were prepared and evaluated for butadiene epoxidation. The results indicated that Cs could enhance butadiene conversion, Cl was favorable for improving the selectivity to vinyloxirane (VO), and Ba probably plays an important role for catalyst stability during the long time on stream operation.     

甘草次酸及其衍生物的质谱研究

本文通过应用ＥＩ质谱和高分辨质谱对甘草次酸及其衍生物进行研究，阐明了分子离子的各种裂解、重排机理，讨论了主要离子的形成过程以及不同取代基对分子离子峰强度的影响。并用软电离手段──快原子轰击正、负离子（ＰＦＡＢ和ＮＦＡＢ）质谱，使ＥＩ谱上不出现分子离子峰的两个化合物而获得满意结果。     

A Simple,Efficient and New Method for Preparing N-Aryl-2-Phenyldiazenecarboxamide

Using ferric chloride to oxidize aryl substituted semicarbazide for preparing azo compounds has been described for the first time in this paper. Nine azo compounds have been synthesized in a good to excellent yield (≥88%). This method only needs cheap reagents, simple instruments and a short reaction time.     

氨基酸在甲醇-水混合溶剂中粘度的研究

报导了在293.15及298.15 K下, 氨基乙酸和DL-氨基丙酸在甲醇-水混合溶剂中的密度及粘度数据; 计算了在无限稀释条件下, 这些体系中氨基酸的粘度B系数及偏摩尔体积。实验结果表明: 在甲醇-水的质量比值(W_B)分别约为0.15及0.25处, 两种氨基酸的B系数均出现极小值。讨论了氨基酸的引入对溶剂结构的影响; 并应用流动过渡状态理论计算了两种氨基酸在甲醇水溶液中的流动活化参数。     

Reversible Switching of a Micelle‐to‐Vesicle Transition by Compressed CO2

The study of the micelle‐to‐vesicle transition (MVT) is of great importance from both theoretical and practical points of view. Herein, we studied the effect of compressed CO₂ on the aggregation behavior of dodecyltrimethylammonium bromide (DTAB)/sodium dodecyl sulfate (SDS) mixed surfactants in aqueous solution by means of direct observation, turbidity and conductivity measurements, steady‐state fluorescence, time‐resolved fluorescence quenching (TRFQ), fluorescence quantum yield, and template methods. Interestingly, all these approaches showed that compressed CO₂ could induce the MVT in the surfactant system, and the vesicles returned to the micelles simply by depressurization; that is, CO₂ can be used to switch the MVT reversibly by controlling pressure. Some other gases, such as methane, ethylene, and ethane, could also induce the MVT of the surfactant solution. A possible mechanism is proposed on the basis of the packing‐parameter theory and thermodynamic principles. It is shown that the mechanism of the MVT induced by a nonpolar gas is different from the MVT induced by polar and electrolyte additives.     

液浮惯性仪表真空充液工艺流程自动化系统

本文通过悬浮对液浮惯性仪表的作用，以及液浮惯性仪表真空充液工艺流程中各节点关键量的控制对液浮惯性仪表的重要性分析，指出真空充液工艺流程自动化的重要性。进而设计出一个液浮惯性仪表真空充液工艺流程自动化系统的硬件和软件组成框图及有关指标和要求，为实际研制提供了有益的依据。     

原子吸收分光光度法测定杜仲茶中无机元素含量

原子吸收分光光度法测定杜仲茶中无机元素含量王彩兰ａ孙瑞霞ｂ吕文英ｂ王太霞ｃａ（河南师范大学化学系新乡４５３００２）ｂ（河南师范大学分析测试中心新乡４５３００２）ｃ（河南师范大学生物系新乡４５３００２）关键词原子吸收杜仲叶制茶无机元素中图分类号Ｏ６５７...