Mechanism and kinetics study on the ozonolysis reaction of 2,3,7,8-TCDD in the atmosphere

The ozonolysis of 2,3,7,8-tetra-chlorodibenzo-p-dioxin(2,3,7,8-TCDD) is an efcient degradation way in the atmosphere. The ozonolysis process and possible reactions path of Criegee Intermediates with NO and H2 O are introduced in detail at the method of MPWB1K/6-31+G(d,p)//MPWB1K/6-311+G(3df,2p) level. In ozonolysis, H2O is an important source of OH radical formation and initiated the subsequent degradation reaction. The Rice-Ramsperger-Kassel-Marcus(RRKM) theory was applied to calculate rate constants with the temperature ranging from 200 to 600 K. The rate constant of reaction between 2,3,7,8-TCDD and O3 is 4.80 × 10 20cm3/(mole·sec) at 298 K and 760 Torr. The atmospheric lifetime of the reaction species was estimated according to rate constants, which is helpful for the atmospheric model study on the degradation and risk assessment of dioxin.     

新疆环境保护网站建设的现状与发展探讨

1997年建成的＂新疆环境保护＂网站是全国第一家环保门户网站,也是新疆第一家政府类网站,新疆环保网站建设与发展已经历风雨兼程的10a,现在正进入一个崭新的发展阶段.回顾、总结和展望新疆各级环保网站的发展,吸取发展中的经验与教训,探索新疆各级环保网站建设中的规律,对新疆环保电子政务的＂理性建设、快速推进＂大有裨益.     

复杂地形大气污染扩散模式选用研究

在大气环境影响评价中,大气扩散和大气湍流受地形因素的影响较大。在以往的大气环境影响评价中,往往只利用现有的理论模型把实际的情况理想化,公式化导致预测的结果和实际情况有较大偏差。地形越简单,偏差越小;地形越复杂,偏差越大。针对以上情况,从相关的模型入手,主要探讨复杂地形条件下,污染物在大气中的扩散,从而研究复杂地形因素在大气环境影响评价等级判定中的应用。通过分析扩散模型的原理及参数、大气稳定度、扩散参数、复杂地形的处理和建筑物下洗等,得出2008版大气技术导则在原理和技术上,比1993版的大气技术导则的先进性、优越性及在今后环境影响评价工作中应注意的细节。本研究的成果对大气环境影响评价工作将起到极大的促进作用。     

硫氮沉降下西北荒漠煤矿区周边土壤性质的变化特点

近年来中国大部分区域大气硫、氮沉降速率趋于平稳甚至下降,但西北地区煤炭行业的快速发展使得硫、氮沉降速率加快.燃煤电厂作为酸前体物的主要排放源之一,在其周围开展硫、氮沉降效应研究,可为合理评价煤矿区大气污染物控制措施的实施效果提供数据支撑.该文以宁东能源化工基地3个燃煤电厂为采样点,研究了电厂周围土壤化学和生物学性质的变...     

Biological Air Quality Monitoring: a Review

Air quality monitoring is currently ensured by captors measuring few physicochemical parameters, then they cannot evaluate unforeseen compounds and the interaction effects of pollutants. On the contrary, the use of bioindicators can answer these problems. Among them, plants are used in two ways:1) Passive bioindicators: trees, lichens and mosses are used to determine the distribution and even the contaminants long-term effects on vast zones and, possibly, the concentrations of pollutants to which they were exposed.2) Active bioindicators: tobacco and mosses make available the defective zones in plants and enable determination of deposition fluxes.Moreover, techniques based on biomarkers identification should increase the answer's sensitivity. However, the plants present the disadvantage of being unable to provide a response in a time lapse comparable with that of the on-line analysers. Lastly, the development of tools using animal cells should allow, in the near future, to measure the total polluting load under conditions close to those of the routine techniques. Then, the real impact of the contaminant on public health could be approached.     

合肥台CTS-1分析系统网络组建

本文阐述了利用UNIX和WIN98／2000互联的局域网技术，对CTS-1系统进行优化配置，组建CTS-1网络分析系统，实现CTS-1系统数据共享，提高地震分析的效率，确保数据备份。利用代理软件用一个MODEM让各个子机同时上网，同时充分利用台站现有的计算机设备，最大限度的实现地震监控、速报、分析以及地震研究的同时开展。     

Reinforcing the rules or integrating behavioural responses into road planning

Road planning is based on technical rules, know-how acquired from experience and professional expertise. A more ergonomics approach to road planning and safety analyses the psychological procedures used by the drivers. Every intervention on road network has an influence on safety. Increasing the coherency of all the interventions in the same area is the only possible way of producing areas with a better level of security. This paper deals with safety procedures, diagnostics and tools which can be used at different levels of intervention.     

成都冬季典型辐射逆温过程分析

本文利用测温声雷达的探测结果，借助同期探空和地面观测资料，分析了成都平原典型辐射逆温的生消演变规律，指出了其主要特征。这些结果对气候资源利用、污染气象条件的研究等具有重要意义。     

腐蚀性空气环境的分级及检测方法

介绍了国外有关腐蚀性空气环境的分级标准及其检测方法。环境中的腐蚀性气体可对电子元器件及自动控制设备产生腐蚀，影响其性能。根据腐蚀性的严重程度，美国仪器学会标准中将腐蚀性空气环境分为四级。环境腐蚀性置于腐蚀性环境中的铜试条进行检测。