生产药用醋酸钾除氯新工艺研究

研究了用硝酸铋代替硝酸银除去溶液中氯离子的新工艺。结果表明,用０．８ｋｇ硝酸铋相当于用０．５ｋｇ硝酸银的除氯效果。     

论货币与金银货币

关于货币产生过程 ,理论界根据马克思的《资本论》 ,普遍认为应划分为四个阶段 ,把货币阶段与金银货币阶段等同起来 ,认为货币即金银货币。本文提出了新观点 :认为根据有关的资料 ,也可以把货币的产生过程划分为五个阶段 ,不把货币与金银货币划等号 ,认为货币的产生应早于金银货币 ,并阐明了提出以上新观点的依据。     

A Multi-Layer System and Its Features: Reconceptualizing the Monetary Regime of Late Qing and Modern China

This essay aims to reconceptualize the monetary regime of late Qing and modern China as a multilayer system of currencies and examine the features and logics of its operation from the 16th century to early 20th century. We argue that this system consists of a variety of silver and copper currencies, each occupying a particular layer in the structure and each satisfying a specific market demand. Analyzing the production and circulation of copper and silver currencies, we first trace their evolution from the Qing to the Republican era and demonstrate the multi-layer currency structure persisted in China across the modernizing changes that took place at the end of the 19th century. Second, using data drawn from gazetteers, this essay adopts a quantitative approach to empirically examine the mechanism and speed of interactions between the different layers of the monetary market and reveal the operational mechanism of the multi-layer system. We suggest that this multi-layer system, while bringing some efficiency loss, also constituted an effective institutional arrangement that helped to ensure the stability of the Chinese economy in tumultuous times.     

基于纳米金等离子体共振光散射法测定阿米卡星

为简便、快速地对阿米卡星的注射液进行检测,基于纳米金颗粒的等离子体共振效应建立了一种检测阿米卡星的新方法。在适宜pH值的KH_2PO_4-Na_2HPO_4缓冲溶液中,利用阿米卡星与纳米金相互作用,使反应体系在640nm处共振光散射信号显著增强,且共振光散射强度增强值ΔI640nm与阿米卡星质量浓度在1.5~500ng/mL范围内线性相关,检出限为0.52ng/mL。在确定的实验条件下,阿米卡星可诱导纳米金颗粒聚集,纳米金颗粒之间距离的变化使其等离子体共振效应发生明显改变,聚集的纳米金颗粒表面等离子体耦合产生了较强的共振光散射信号,且共振光散射信号增强值与阿米卡星的浓度变化值呈现良好的线性关系。实验表明,该方法可用于快速测定阿米卡星。