基于小波变换的水源水中藻类生长动态研究

对利用小波变换法对天津引滦原水中日检测叶绿素（藻类表征指标）构成的时间序列进行了变换，将原始序列分解为5个低频和较低频的周期性小波系数和3个高频的“噪音”小波系数，发现5个周期性信息变化与季节更替、优势藻种变换及一定条件下藻类生长动态平衡等因素有关；而高频的“噪音”细节信息除检测误差造成外，降雨、风向及取样的深度也会对此产生重要的影响。通过该段时间水源区域内的气温、太阳曝辐照度及降雨数据分析，验证了小波转换系数的意义及分析结果。     

突发性水污染事件损失的系统分析

构建了突发水污染事件损失的系统分析方法，并应用于松花江事件。分析表明，特征污染物排放事故导致了严重水体污染。水体污染影响的主要受体有：农作物、畜牧、水产品、旅游（从景观角度）、水生生态（包括底泥）、供水水源（包括集中供水水源和分散供水水源）。经济损失包括经济活动损失、健康损失、生态损失和生产安全事故损失。     

兰州市大气降尘中PAHs分布与生态风险评价

对兰州市春季不同功能区大气降尘有机质中多环芳烃（PAHs）种类进行分析，采用GC／MS法检出了大气降尘中有机质USEPA优控PAHs有11种以上，含量较高的集中于萘（NAP）、荧蒽（FLUA）、菲（PHE）、芘（PYR）、[艹屈]（CHR），占各采样点PAHs总量的70％以上。源解析表明兰州市各功能区大气降尘PAHs来源不仅有较高的燃煤源、交通源（汽车尾气），同时PAHs的组成与分布也在很大程度上受到采样点周围居民居住环境的影响。对照有关的沉积物质量标志水平，兰州市城关区各站点都有PAHs浓度超出相应质量警戒水平，属高生态风险区     

Mechanical Properties and Lipase-Catalyzed Biodegradation of α-Methyl, ε-Caprolactone/ ε-Caprolactone Copolymers Obtained by Chemical Modification of Poly(ε-caprolactone)

Novel (-caprolactone)-based copolymers of different compositions were synthesized by allowing methyl iodide to react with the polycarbanion that resulted from the action of lithium diisopropylamide on poly(-caprolactone) in THF at –70°C under argon atmosphere. The copolymers were characterized by various techniques, namely ¹H nuclear magnetic resonance, size exclusion chromatography, differential scanning calorimetry, x-ray diffraction and viscoelasticimetry. They were submitted to hydrolytic and lipase-catalyzed enzymatic degradation in comparison with genuine PCL. The Young modulus depended on the degree of methylation. In contrast, loss angle and glass transition temperature did not depend on this parameter. It is shown that the lipase-catalyzed degradation of methylated PCL is much slower than in the case of genuine PCL.     

膜分离活性污泥法及膜的选择

阐述了膜分离活性污泥法的类型及关键工艺——膜组件的选择方法，并对膜分离活性污泥法在国内外的应用进行了简述。     

中国地震灾害现状及地震灾害系统工程研究

本文在对中国地震灾害现状分析的基础之上，依据地震工作三大体系的要求和建设首都圈防震减灾系统工程的经验，提出了在我国建立地震灾害系统工程的设想，并对该系统进行了初步的设计和论证。分析研究表明，地震灾害系统工程可以涵盖地震工作的各个方面，并且具有系统化、法制化及高科技等特点，对我国实现减轻地震灾害的目标具有积极的推进作用。     

新疆某铀矿区生产场所环境γ外照射水平及所致职业者的剂量

本文报道了新疆某铀矿生产场所及周围居民村环境γ外照射水平的结果.结果表明:铀矿区生产场所γ外照射剂量率高于对照区,铀矿生产场所周围居民村环境γ外照射剂量率与对照区居民村的γ外照射剂量率相近.经估算得出了采矿、水冶工种人员和附属设施工种人员受到γ外照射最大年有效剂量当量仅为我国放射防护基本标准规定限值的9.1％和1.8％.这一附加剂量,对放射职业工作者的健康不会造成损伤影响.     

基于信号流循环的振动试验控制回路分析研究

目的总结分析振动试验信号循环全过程的数学模型及传递关系。方法根据信号传递过程中的作用,将振动设备划分为五类关键设备,并且将信号流在信号转换、信号可测及运动可控等方面的传递关系进行分析汇总,最后给出以控制仪为回路节点的两类开环故障的影响分析。结果通过对信号流循环过程的分析研究,总结了闭环反馈控制过程各环节中的信号传递关系,分析了各关键设备性能对振动试验信号传递的影响,以便于试验人员更好地开展振动试验。结论信号流循环的正常运转是振动试验顺利开展的基础,深入了解信号传递关系和影响因素,可以高质量地开展振动试验。     

被动采样监测环境空气中SO 2和NO 2

用自主研制的采样管开展环境空气中SO2和NO2的被动采样监测.结果表明,被动采样监测结果与自动监测结果高度相关,经回归方程修正后,两者的结果没有显著性差异,被动采样的采样和分析产生的误差得以消除.     

Biochemical study of retired pentachlorophenol workers with and without following dietary exposure to PCDD/Fs

Objectives

This is the first research study to compare among female, non-smoker workers: (a) the exposure to benzene, toluene and xylenes (BTXs) in urban air during work in the street (traffic policewomen, TP) vs. work in vehicles (police drivers, PD); (b) the exposure to BTXs in urban environments (in street and in car) vs. rural environments (roadwomen, RW); (c) the values of blood benzene, urinary trans, trans muconic acid (t,t-MA) and urinary S-phenylmercapturic acid (S-PMA) in urban areas (in street and in car) vs. rural areas.

Methods

Passive personal samplings and data acquired using fixed monitoring stations located in different areas of the city were used to measure environmental and occupational exposure to BTXs during the work shift in 48 TP, 21 PD and 22 RW. In the same study subjects, blood benzene, t,t-MA and S-PMA were measured at the end of each work shift.

Results

Personal exposure of urban workers to benzene seemed to be higher than the exposure measured by the fixed monitoring stations. Personal exposure to benzene and toluene was (a) similar among TP and PD and (b) higher among urban workers compared to rural workers. Personal exposure to xylenes was (a) higher in TP than in PD and (b) higher among urban workers compared to rural workers. Blood benzene, t,t-MA and S-PMA levels were similar among TP and PD, although the blood benzene level was significantly higher in urban workers compared to rural workers. In urban workers, airborne benzene and blood benzene levels were significantly correlated.

Conclusions

Benzene is a human carcinogen, and BTXs are potential reproductive toxins at low dose exposures. Biological and environmental monitoring to assess exposure to BTXs represents a preliminary and necessary tool for the implementation of preventive measures for female subjects working in outdoor environments.