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51.
The relationship between the rainwater composition on two consecutive rain days was analyzed. Logrono, a remote station in the North of Spain was chosen for the analyses. The concentration of the major ions in the rainwater of the first rain day is linearly related to the concentration of the second rain day except for those ions whose source is the soil (Ca2+ and Mg2+). These ions are related to SO4 2? and NO3 ? in the first rain day, but not in the second. 相似文献
52.
小水电站环境影响评价中的公众参与 总被引:1,自引:0,他引:1
本文分析了小水电站建设对环境影响的特殊性,阐述对其环境影响评价中的公众参与的特殊内容,提出了公众参与的三种方式:公众个人问卷调查、基层组织调查、县(市)政府公共管理部门调查。 相似文献
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分析县级环境监测站质量管理的现状以及存在问题,提出加强和完善县级环境监测质量管理的对策,以期通过强化管理体系的运行管理,完善质量管理人员队伍体系,全面加强质量管理工作。 相似文献
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The overall survey on indoor radon concentration was conducted at all subway stations in a major city, Daejeon in the central part of Korea. It was quarterly performed from September 2007 to August 2008. The annual arithmetic mean of indoor radon concentration of all the stations was 34.1 ± 14.7 Bq m−3, and the range of values was from 9.4 to 98.2 Bq m−3. The radon concentrations in groundwater (average 31.0 ± 0.8 Bq m−3) were not significantly high in most stations, but the concentration (177.9 ± 2.3 Bq L−1) of one station was over the level of 148 Bq L−1 in drinking water proposed by U.S. EPA. Based on indoor survey results, the approximate average of the annual effective dose by radon inhalation to the employees and passengers were 0.24 mSv y−1, and 0.02 mSv y−1, respectively. Although the effective dose based on the UNSCEAR report was potentially estimated, for more accurate assessment, the additional survey on the influence by indoor radon will be necessary. 相似文献
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本文是针对数字电视的可靠性试验部分,结合国标通用的可靠性试验技术将数字电视原理及方法进行阐述,供相关实验室及检测人员参考. 相似文献
59.
加油站油气处理装置是控制埋地油罐油气压力并对油气进行回收处理的装置,测试分析油气处理装置进口和出口挥发性有机物(VOCs)化学组成,利用最大增量反应活性(MIR)和气溶胶生成系数(FAC)估算VOCs的臭氧生成潜势(OFP)和二次有机气溶胶生成潜势(SOAP),量化评估其二次污染生成贡献.结果表明:(1)油气处理装置进口和出口ρ(TVOC)分别为436~706 g·m-3和4.98~10.04 g·m-3,VOCs排放主要为烷烃(72%±4%)、含氧有机物(14%±2%)和烯烃(11%±5%).不同处理工艺VOCs排放差异较小,关键物种均为异戊烷(约25%),其次为正丁烷、异丁烷和正戊烷.(2)油气处理装置出口排放的VOCs臭氧生成系数(SR值)为2.6~3.3 g·g-1,OFP为3.5~25.6 g·m-3,其中烯烃对OFP贡献率(43%~69%)最大,其次为烷烃(20%~35%)和含氧有机物(10%~22%),OFP主要贡献物种为丁烯、顺-2-丁烯、反-2-丁烯、异戊烷和丙醛.(3)油气处理装... 相似文献
60.
In the recent years concerns whether exposure to electromagnetic fields (EMF) from base station antennae can cause adverse
health effects are grown. Great attention is paid on risk of EMF exposure to people living in a close proximity of base stations.
In this issue, a point of interest is the personnel mounting, adjusting and maintaining base stations. Their working tasks
require stay in high EMF levels’ conditions. There are only few studies concerning this specific occupational group. The results
from our previous investigation (Zaryabova and Israel 2006) show that in␣many cases on performing some specific tasks operators
are overexposed according to our national legislation, and ICNIRP guidelines. Here, we present an extended study covering
more base stations and more precise scenario for performed tasks and working positions. Results of exposure assessment are
presented. They include energetic load calculations on the basis of Bulgarian national legislation, and the corresponding
SAR values. Data are used to determine permissible time duration for each particular work operation and served as a base for
limiting the exposure and proposal for protective measures for the personnel. 相似文献