<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Hu, M.</style></author><author><style face="normal" font="default" size="100%">Peng, J. F.</style></author><author><style face="normal" font="default" size="100%">K. Sun</style></author><author><style face="normal" font="default" size="100%">Yue, D. L.</style></author><author><style face="normal" font="default" size="100%">Guo, S.</style></author><author><style face="normal" font="default" size="100%">Wiedensohler, A.</style></author><author><style face="normal" font="default" size="100%">ZJ Wu</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Estimation of Size-Resolved Ambient Particle Density Based on the Measurement of Aerosol Number, Mass, and Chemical Size Distributions in the Winter in Beijing</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental Science &amp; TechnologyEnvironmental Science &amp; Technology</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Environ Sci TechnolEnviron Sci Technol</style></alt-title><short-title><style face="normal" font="default" size="100%">Environ. Sci. Technol.</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">air</style></keyword><keyword><style  face="normal" font="default" size="100%">analyzer</style></keyword><keyword><style  face="normal" font="default" size="100%">China</style></keyword><keyword><style  face="normal" font="default" size="100%">ionic compositions</style></keyword><keyword><style  face="normal" font="default" size="100%">mobility</style></keyword><keyword><style  face="normal" font="default" size="100%">morphology</style></keyword><keyword><style  face="normal" font="default" size="100%">pm2.5</style></keyword><keyword><style  face="normal" font="default" size="100%">variability</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Sep 18</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">18</style></number><volume><style face="normal" font="default" size="100%">46</style></volume><pages><style face="normal" font="default" size="100%">9941-9947</style></pages><isbn><style face="normal" font="default" size="100%">0013-936X</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">Simultaneous measurements of aerosol size, distribution of number, mass, and chemical compositions were conducted in the winter of 2007 in Beijing using a Twin Differential Mobility Particle Sizer and a Micro Orifice Uniform Deposit Impactor. Both material density and effective density of ambient particles were estimated to be 1.61 +/- 0.13 g cm(-3) and 1.62 +/- 0.38 g cm(-3) for PM1.8 and 1.73 +/- 0.14 g cm(-3) and 1.67 +/- 0.37 g cm(-3) for PM10. Effective density decreased in the nighttime, indicating the primary particles emission from coal burning influenced the density of ambient particles. Size-resolved material density and effective density showed that both values increased with diameter from about 1.5 g cm(-3) at the size of 0.1 mu m to above 2.0 g cm(-3) in the coarse mode. Material density was significantly higher for particles between 0.56 and 1.8 mu m during clean episodes. Dynamic Shape Factors varied within the range of 0.95-1.13 and decreased with particle size, indicating that coagulation and atmospheric aging processes may change the shape of particles.</style></abstract><accession-num><style face="normal" font="default" size="100%">ISI:000308787800016</style></accession-num><notes><style face="normal" font="default" size="100%">005ZDTimes Cited:1Cited References Count:36</style></notes><auth-address><style face="normal" font="default" size="100%">Hu, MPeking Univ, Coll Environm Sci &amp; Engn, State Key Joint Lab Environm Simulat &amp; Pollut Con, Beijing 100871, Peoples R ChinaPeking Univ, Coll Environm Sci &amp; Engn, State Key Joint Lab Environm Simulat &amp; Pollut Con, Beijing 100871, Peoples R ChinaLeibniz Inst Tropospher Res, Leipzig, Germany</style></auth-address></record></records></xml>