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51.
Zhuoyu Li Guangzhao Xie Hui Chen Bixin Zhan Lin Wang Yujing Mu Abdelwahid Mellouki Jianmin Chen 《环境科学学报(英文版)》2022,34(4):221-232
As a secondary pollutant of photochemical pollution, peroxyacetyl nitrate(PAN) has attracted a close attention. A four-month campaign was conducted at a rural site in North China Plain(NCP) including the measurement of PAN, O3, NOx, PM2.5, oxygenated volatile organic compounds(OVOCs), photolysis rate constants of NO2 and O3 and meteorological parameters to investigate the wintertime characterization of photochemistry from November 2018 to Fe... 相似文献
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Although marine and terrestrial emissions simultaneously affect the formation of atmospheric fine particles in coastal areas, knowledge on the optical properties and sources of water-soluble matter in these areas is still scarce. In this work, taking Qingdao, China as a typical coastal location, the chemical composition of PM2.5 during winter 2019 was analyzed.Excitation-emission matrix fluorescence spectroscopy was combined with parallel factor analysis model to explain the component... 相似文献
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对旋风除尘器在静态载荷下的强度进行了分析,发现头部顶板是较薄弱部件。通过动态载荷系数(DLF)方法,研究了旋风除尘器承受动态粉尘爆炸压力载荷时提高使用强度的可能性,结果表明,一般情况下,由于载荷的动态特性导致设备强度的变化可以忽略。 相似文献
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环境评价污染气象观测与分析的几个问题 总被引:1,自引:0,他引:1
就实际环评工作中污染气象观测与分析中资料的选取与分析,地面常规气象资料的统计与分析,大气边界层观测与分析等几个问题提出了看法和建议。 相似文献
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The present research was designed to examine the psychometric properties of Chinese versions of the Self Report Driver Behavior Aggression and Assertiveness subscales, the Driving Vengeance Questionnaire, and the Violent Driving Questionnaire. Study 1 found that the all scales demonstrated good internal consistency, with alphas ranging from .76 to .87 and that assertive driving was related to demerit points received over the past 12 months while driver aggression and violence were linked to collisions over the past 12 months. Study 2 found that the scales exhibited reasonable test-retest reliability, with correlations ranging from .82 to .89. Finally, Study 3 showed that each scale was predicted by other dangerous driving attitudes and behaviors, similar to the original versions. The consistency between the translated and original scales, the implications for use in a Chinese sample, and the uniformity of actions in the traffic environment across cultures are discussed. 相似文献
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To assess the responses of the soil microbial community to chronic ozone (O3), wheat seedlings (Triticum aestivum Linn.) were planted in the field and exposed to elevated O3 (eO3) concentration. Three treatments were employed: (1) Control treatment (CK), AOT40 = 0; (2) O3-1, AOT40 = 1.59 ppm•h; (3) O3-2, AOT40 = 9.17 ppm•h. Soil samples were collected for the assessment of microbial biomass C, community-level physiological profiles (CLPPs), and phospholipid fatty acids (PLFAs). EO3 concentration significantly reduced soil microbial carbon and changed microbial CLPPs in rhizosphere soil, but not in non-rhizosphere soil. The results of the PLFAs showed that eO3 concentrations had significant effects on soil community structure in both rhizosphere and non-rhizosphere soils. The relative abundances of fungal and actinomycetous indicator PLFAs decreased in both rhizosphere and non-rhizosphere soils, while those of bacterial PLFAs increased. Thus the results proved that eO3 concentration significantly changed the soil microbial community function and composition, which would influence the soil nutrient supply and carbon dynamics under O3 exposure. 相似文献
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2013年12月1-9日成都及周边城市出现了一次较为严重的区域大气污染过程,重污染区域集中在成都市,其API值最高达到225,首要污染物为PM2.5。对成都地区PM2.5源解析可得出本次污染过程是以机动车尾气和煤烟污染的混合型污染过程,贡献比重之和为42.8%。同时探讨了研究期间造成污染持续累积的相关因素:高空500hPa的大气环流形势处于弱高压前部以下层气流为主;主导风向西南风和东南风,平均风速分别为1.46m/s和0.99m/s,无降水,气温日较差较往年偏高7.1℃的气象条件;高湿及"双逆温"效应的大气结构均不利于污染物扩散。研究表明逆温强度变化与颗粒物浓度的消长具有显著的滞后一致性。研究结果可为成都平原地区发生重污染过程的预警预报及污染防治提供理论依据和研究参考。 相似文献
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