共查询到17条相似文献,搜索用时 46 毫秒
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《中国粉体技术》2017,(6):17-23
利用2014—2015年安徽淮南观测站的黑碳仪观测数据,分析华东乡村代表性地区气溶胶吸收特性的变化特征及其影响因子。研究表明,观测期间520 nm波段的气溶胶吸收系数平均为(24.6±18.4)Mm-1,且存在显著的波长依赖性,吸收波长指数平均为1.3±0.2,这与该地区较高的生物质燃烧排放有关。利用吸收系数与波长的关系,分离获得生物质燃烧排放的除黑碳以外的其他气溶胶的吸收波长指数,平均为2.7±0.7,在此基础上,进一步对吸收系数进行分离,发现每年5—6月、10月到次年1月是该地区受生物质燃烧影响较为严重的时期,以2014年6月为例,本地秸秆焚烧和江浙一带污染物的区域输送过程,是导致淮南地区污染加重的主要原因。 相似文献
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高飞 《中国新技术新产品》2009,(21):186-186
在智能建筑设计中,对于建筑内的各智能化系统设置的设计中,目前存在着几种做法。本文的方法则是有选择性地将某些平时工作上有联系的子系统之间,产生一种联动关系,也不妨称之为有关子系统的小集成。 相似文献
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作为气象工作的根本前提,气象观测同时也是气象测报的首要参照依据。而气象观测资料中,最关键的参照依据应是地面自动站测报的数据。可以说,评价及分析某一地区的气候根本取决于地面自动站测报数据精准与否。假使测报质量不够精准,防(减)灾工作的开展既不会及时,也不会顺利。然而,如何持续提升地面气象自动观测质量也值得深思。故而,本文基于地面气象自动观测质量提升的意义,分析了现存地面自动站观测质量问题,进而结合工作实践,提出可行性措施,以期为地面气象自动观测质量的根本提升提供有益参考。 相似文献
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环形溶蚀器大气颗粒物采集系统条件实验研究 总被引:1,自引:0,他引:1
为确定环形溶蚀器大气颗粒物采集系统的最优化条件,于2008年夏季与冬季在北京市进行了关于优化环形溶蚀器涂渍溶液浓度的条件实验。结果表明:为保障大气中酸碱性气体的去除效率达到95%以上,环形溶蚀器中柠檬酸涂渍溶液的优化浓度在夏季和冬季分别为6%与3%;环形溶蚀器中碳酸钠涂渍溶液的优化浓度在夏季和冬季分别为2%与4%。讨论说明在特定地点特定时间利用环形溶蚀器大气颗粒物采集系统采样前,确定环形溶蚀器涂层溶液优化浓度的必要性。 相似文献
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2011年春季上海市一次典型污染过程及气溶胶的垂直分布特征 总被引:2,自引:0,他引:2
利用多种地面观测资料,研究2011年4月14—15日上海的一次典型污染过程,分析生消机制、污染物来源以及气溶胶垂直分布的演变过程。结果表明,14、15日PM2.5的日平均质量浓度分别为78.9、115.9μg/m3,均超过环境空气质量标准中PM2.5质量浓度的二级标准;污染过程形成于稳定天气形势下污染物的积累,结束于短时降水和冷空气南下的共同作用;污染物主要源于上海本地及其西南方的局地污染;污染天气对流层低层的消光系数远大于非污染天气的。 相似文献
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The sampling process of a model room with a suction nozzle in a calm or low movement environment was numerically simulated and experimentally analyzed. Computational fluid dynamics (CFD) software, Fluent (Fluent Inc.), was used for the numerical simulation. The flow was considered to be compressible and turbulent, and particles were considered to be spheres of constant density. A good agreement was found between the numerical and experimental results (maximum difference of 15% in the overlapping zone), and the numerical model was further extended and used for parametric analysis. The influence of sampling velocity and shape of the suction nozzle on sampling efficiency was investigated experimentally and numerically in a particle size range of 2–45 µm. It was found that sampling efficiency is smaller for V-shaped nozzles, mainly for lower velocities. Sampling efficiency was calculated for each particle diameter and for the whole particle size distribution as well. Sampling efficiency decreases as particle size increases. It is concluded that knowledge of sampling efficiency for each of the sampled particle sizes may indicate the concentration and size distribution in the sampled space. 相似文献
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The sampling process of a model room with a suction nozzle in a calm or low movement environment was numerically simulated and experimentally analyzed. Computational fluid dynamics (CFD) software, Fluent (Fluent Inc.), was used for the numerical simulation. The flow was considered to be compressible and turbulent, and particles were considered to be spheres of constant density. A good agreement was found between the numerical and experimental results (maximum difference of 15% in the overlapping zone), and the numerical model was further extended and used for parametric analysis. The influence of sampling velocity and shape of the suction nozzle on sampling efficiency was investigated experimentally and numerically in a particle size range of 2-45 µm. It was found that sampling efficiency is smaller for V-shaped nozzles, mainly for lower velocities. Sampling efficiency was calculated for each particle diameter and for the whole particle size distribution as well. Sampling efficiency decreases as particle size increases. It is concluded that knowledge of sampling efficiency for each of the sampled particle sizes may indicate the concentration and size distribution in the sampled space. 相似文献