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Ji Young Park Peter C. Raynor Andrew D. Maynard Lynn E. Eberly Gurumurthy Ramachandran 《Atmospheric environment (Oxford, England : 1994)》2009,43(3):502-509
Recent research has suggested that the adverse health effects caused by nanoparticles are associated with their surface area (SA) concentrations. In this study, SA was estimated in two ways using number and mass concentrations and compared with SA (SAmeas) measured using a diffusion charger (DC). Aerosol measurements were made twice: once starting in October 2002 and again starting in December 2002 in Mysore, India in residences that used kerosene or liquefied petroleum gas (LPG) for cooking. Mass, number, and SA concentrations and size distributions by number were measured in each residence. The first estimation method (SAPSD) used the size distribution by number to estimate SA. The second method (SAINV) used a simple inversion scheme that incorporated number and mass concentrations while assuming a lognormal size distribution with a known geometrical standard deviation. SAPSD was, on average, 2.4 times greater (range = 1.6–3.4) than SAmeas while SAINV was, on average, 6.0 times greater (range = 4.6–7.7) than SAmeas. The logarithms of SAPSD and SAINV were found to be statistically significant predictors of the logarithm of SAmeas. The study showed that particle number and mass concentration measurements can be used to estimate SA with a correction factor that ranges between 2 and 6. 相似文献
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Robert J. Luxmoore William W. Hargrove M. Lynn Tharp Wilfred M. Post Michael W. Berry Karen S. Minser Wendell P. Cropper Jr. Dale W. Johnson Boris Zeide Ralph L. Amateis Harold E. Burkhart V. Clark Baldwin Jr. Kelly D. Peterson 《Environmental Modeling and Assessment》2000,5(2):125-137
Stochastic transfer of information in a hierarchy of simulators is offered as a conceptual approach for assessing forest responses
to changing climate and air quality across 13 southeastern states of the USA. This assessment approach combines geographic
information system and Monte Carlo capabilities with several scales of computer modeling for southern pine species and eastern
deciduous forests. Outputs, such as forest production, evapotranspiration and carbon pools, may be compared statistically
for alternative equilibrium or transient scenarios providing a statistical basis for decision making in regional assessments.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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