The effect of the air quality ensuring measures for the Beijing 2008 Olympic Games in reducing air pollution during the game period is assessed using the tropospheric NO2 column density retrieved from Ozone Monitoring...The effect of the air quality ensuring measures for the Beijing 2008 Olympic Games in reducing air pollution during the game period is assessed using the tropospheric NO2 column density retrieved from Ozone Monitoring Instrument onboard AURA satel- lite. The basic method of the assessment is the comparison of the NO2 column densities during the game period with that during the corresponding period of 2005?2007 for the Beijing area, and the comparison among Beijing and neighbouring cities Tianjin and Tangshan, which are of similar situation in air pollution of NO2 in recent years. The images of tropospheric NO2 column den- sities over Northern China during the Beijing 2008 Olympic Games show the remarkable effect of the air quality ensuring meas- ures in reducing NO2 pollution: the tropospheric NO2 column density in Beijing is much lower than that in Tianjin and Tangshan, while there were very similar values in the three large cities during the same period of the last three years. About 40% reduction in tropospheric NO2 column density over the Beijing area is obtained from the assessment during July to August, 2008, a key period of air quality ensuring measures for the Beijing 2008 Olympic Games.展开更多
基金supported by the funds of Beijing Municipal Science and Technol-ogy Commission (Grant No. Z005190042791)National Natural Science Foundation of China (Grant No. 40875084)+1 种基金National Basic Research Pro-gram of China (Grant No. 2006CB403702)EU PF6 AMFIC Project
文摘The effect of the air quality ensuring measures for the Beijing 2008 Olympic Games in reducing air pollution during the game period is assessed using the tropospheric NO2 column density retrieved from Ozone Monitoring Instrument onboard AURA satel- lite. The basic method of the assessment is the comparison of the NO2 column densities during the game period with that during the corresponding period of 2005?2007 for the Beijing area, and the comparison among Beijing and neighbouring cities Tianjin and Tangshan, which are of similar situation in air pollution of NO2 in recent years. The images of tropospheric NO2 column den- sities over Northern China during the Beijing 2008 Olympic Games show the remarkable effect of the air quality ensuring meas- ures in reducing NO2 pollution: the tropospheric NO2 column density in Beijing is much lower than that in Tianjin and Tangshan, while there were very similar values in the three large cities during the same period of the last three years. About 40% reduction in tropospheric NO2 column density over the Beijing area is obtained from the assessment during July to August, 2008, a key period of air quality ensuring measures for the Beijing 2008 Olympic Games.
文摘目的研究不同中性粒细胞水平对急性缺血性脑卒中(acute ischemic stroke,AIS)患者静脉溶栓后出血转化的影响。方法回顾性收集2017年1月-2019年3月在徐州医科大学附属医院因AIS接受静脉溶栓治疗患者的资料,共计177例。按溶栓前中性粒细胞计数水平,将177例患者分为低中性粒细胞组(<7.1×10^9/L)和高中性粒细胞组(≥7.1×10^9/L),分析两组患者基线资料和静脉溶栓后出血转化的差异。结果高中性粒细胞组患者静脉溶栓后出血发生率高于低中性粒细胞组(17.0%比5.6%,P=0.016);校正年龄、性别、抗栓及抗凝药服用史、既往脑卒中病史及美国国立卫生研究院卒中量表评分(National Institutes of Health Stroke Scale,NIHSS)后,多因素Logistic回归分析结果显示,高中性粒细胞计数水平是静脉溶栓后发生出血的独立危险因素[比值比(odds ratio,OR)=3.622,95%CI 1.099~12.203,P=0.035)]。结论中性粒细胞计数升高是AIS患者静脉溶栓后出血转化的独立危险因素。
