Insights into reactive oxygen species formation induced by water-soluble organic compounds and transition metals using spectroscopic method

Ambient particulate matter (PM) can cause adverse health effects via their ability to produce Reactive Oxygen Species (ROS). Water-Soluble Organic Compounds (WSOCs), a complex mixture of organic compounds which usually coexist with Transition Metals (TMs) in PM, have been found to contribute to ROS formation. However, the interaction between WSOCs and TMs and its effect on ROS generation are still unknown. In this study, we examined the ROS concentrations of V, Zn, Suwannee River Fulvic Acid (SRFA), Suwannee River Humic Acid (SRHA) and the mixtures of V/Zn and SRFA/SRHA by using a cell-free 2′,7′-Dichlorodihydrofluorescein (DCFH) assay. The results showed that V or Zn synergistically promoted ROS generated by SRFA, but had an antagonistic effect on ROS generated by SRHA. Fluorescence quenching experiments indicated that V and Zn were more prone to form stable complexes with aromatic humic acid-like component (C1) and fulvic acid-like component (C3) in SRFA and SRHA. Results suggested that the underlying mechanism involving the fulvic acid-like component in SRFA more tending to complex with TMs to facilitate ROS generation through π electron transfer. Our work showed that the complexing ability and complexing stability of atmospheric PM organics with metals could significantly affect ROS generation. It is recommended that the research deploying multiple analytical methods to quantify the impact of PM components on public health and environment is needed in the future.     

金属基复合材料及其超塑性技术的发展

颗粒或晶须增强铝基复合材料具有优良的性能。目前其制备工艺主要采用粉末冶金法和挤压铸造法。这类铝基复合材料已经有许多应用实例。铝基复合材料超塑性是近年来开发的新技术,可解决其成形性差的加工难题,扩大其应用领域。     

抗生素制药废水的处理

锦州九泰制药废水属于不易生化类废水，废水量1000m^3/d，污水站总投资140万元。本文阐述了该工程的水质、预处理、生化处理工艺、活性污泥的培养与驯化及运行效果与设计特点。     

用传递矩阵法计算消声器插入损失的理论探讨

采用声电类比的传递矩阵法，本文对消声器插入损失进行了理论探讨，所推导的理论公式准确地反映了整个内燃机排气系统对消声器插入损失的影响，克服了其它学者在研究此问题中的不足，考虑了声源声阻抗对传递损失的影响，对消声器的整体优化设计具有重要的指导意义。     

Optimizing the atmospheric sampling sites using fuzzy mathematic methods

A new approach applying fuzzy mathematic theorems, including the Primary Matrix Element Theorem and the Fisher Classification Method, was established to solve the optimization problem of atmospheric environmental sampling sites. According to its basis, an application in the optimization of sampling sites in the atmospheric environmental monitoring was discussed. The method was proven to be suitable and effective. The results were admitted and applied by the Environmental Protection Bureau (EPB) of many cities of China. A set of computer software of this approach was also comuletelv comniled and used.     

TiO2膜固载型多孔催化剂的光催化分解试验

以多孔基质为载体,用溶胶-凝胶法制备出载ＴｉＯ２薄膜的多孔型光催化剂。用Ｘ射线衍射和扫描电镜对催化剂的物相和形貌进行了表征，此催化剂能在光照下分解水溶液中四环素抗菌素。经１ｈ光照，四环素的分解率可达８５％左右。     

气相连通罐组群罐燃爆风险定量评估技术研究

炼化企业气相连通罐组存在群罐重大火灾风险,需要采取系统评估、层层设防的思路进行防控。采用HALOPA技术,结合中国石化风险矩阵标准,建立基于风险的气相连通罐组重大燃爆风险控制准则、不同罐容的事故后果等级划分标准、各类保护措施的风险消减因子和燃爆事件可能性评估方法以及相关重要设计要求。案例分析表明,VOCs气相连通罐组群罐燃爆风险定量评估方法可对群罐火灾风险进行快速量化评估,可用于气相连通罐组的风险评估和工程安全设计。     

在监测样本信息的基础上确定水环境系统权重的分配方法

权重确定是水环境质量评价中很重要的一个方面，本文在监测样本信息的基础上，利用正交旋转变换方法，提出了一种权重确定方法，并结合实际进行了计算。     

四川花卉业的产业化发展

本文分析了四川发展花卉业的优势和存在的问题，提出了四川花卉产业化发展的指导思想与基本原则、区域布局以及应采取的对策．     

小型尾矿坝风险分析

利用鱼刺图分析了小型尾矿库存在的风险,并结合某地区随机抽取的20个小型尾矿坝的相关数据,通过风险评价指数矩阵法分析了此地区小型尾矿坝的风险,确定了该地区小型尾矿库的风险等级.