Results 21 to 30 of about 73,680 (311)

Development and characterization of a high-performance single-particle aerosol mass spectrometer (HP-SPAMS) [PDF]

Atmospheric Measurement Techniques
This study describes a high-performance single-particle mass spectrometry (HP-SPAMS) design in detail. The comprehensive improvements in the injection system, optical sizing system, mass spectrometry, and data acquisition system have improved particle ...
X. Du, X. Du, Q. Xie, Q. Xie, Q. Huang, Q. Huang, X. Li, X. Li, J. Yang, Z. Hou, J. Wang, X. Li, X. Li, Z. Zhou, Z. Zhou, Z. Huang, Z. Huang, W. Gao, W. Gao, L. Li, L. Li   +20 more
doaj   +1 more source

Source apportionment and sensitivity analysis: two methodologies with two different purposes [PDF]

Geoscientific Model Development, 2017
This work reviews the existing methodologies for source apportionment and sensitivity analysis to identify key differences and stress their implicit limitations.
A. Clappier, C. A. Belis, D. Pernigotti, P. Thunis   +3 more
doaj   +1 more source

Photochemical grid model implementation and application of VOC, NO_x, and O₃ source apportionment [PDF]

Geoscientific Model Development, 2015
For the purposes of developing optimal emissions control strategies, efficient approaches are needed to identify the major sources or groups of sources that contribute to elevated ozone (O3) concentrations.
R. H. F. Kwok, K. R. Baker, S. L. Napelenok, G. S. Tonnesen   +3 more
doaj   +1 more source

Are contributions of emissions to ozone a matter of scale? [PDF]

Geoscientific Model Development, 2020
Anthropogenic and natural emissions influence the tropospheric ozone budget, thereby affecting air quality and climate. To study the influence of different emission sources on the ozone budget, often source apportionment studies with a tagged tracer ...
M. Mertens, A. Kerkweg, A. Kerkweg, V. Grewe, V. Grewe, P. Jöckel, R. Sausen   +6 more
doaj   +1 more source

Source identification of the elemental fraction of particulate matter using size segregated, highly time-resolved data and an optimized source apportionment approach

Atmospheric Environment: X, 2022
Source emissions with high covariance degrade the performance of multivariate models, and often highly-time resolved data is needed to accurately extract the contribution of different emissions. Here, we use highly time-resolved size segregated elemental
M. Manousakas, M. Furger, K.R. Daellenbach, F. Canonaco, G. Chen, A. Tobler, P. Rai, L. Qi, A.H. Tremper, D. Green, C. Hueglin, J.G. Slowik, I. El Haddad, A.S.H. Prevot   +13 more
doaj   +1 more source

The air quality impact of cordon and distance based road user charging: an empirical study of Leeds, U.K [PDF]

, 2005
Traffic assignment, pollutant emission and dispersion models were applied to a major UK city so as to assess the air quality impacts of five road pricing schemes.
Milne, D.S., Mitchell, G., Namdeo, A.K.
core   +1 more source

Quantifying black carbon light absorption enhancement with a novel statistical approach [PDF]

Atmospheric Chemistry and Physics, 2018
Black carbon (BC) particles in the atmosphere can absorb more light when coated by non-absorbing or weakly absorbing materials during atmospheric aging, due to the lensing effect.
C. Wu, C. Wu, D. Wu, D. Wu, D. Wu, J. Z. Yu, J. Z. Yu, J. Z. Yu   +7 more
doaj   +1 more source

Direct mass spectrometry analysis of biological tissue for diagnosis of thyroid cancer using wooden-tip electrospray ionization

Frontiers in Chemistry, 2023
Direct mass spectrometry (MS) analysis of human tissue at the molecular level could gain insight into biomarker discovery and disease diagnosis. Detecting metabolite profiles of tissue sample play an important role in understanding the pathological ...
Dasheng Liu, Yuejian Shen, Dandan Di, Dandan Di, Shenhui Cai, Xueyang Huang, Hongguo Lin, Yalan Huang, Jing Xue, Li Liu, Bin Hu   +10 more
doaj   +1 more source

Considerations for design of source apportionment studies [PDF]

, 1984
This report recommends procedures for source and ambient sampling and analysis in source apportionment studies. The recommendations are based on the results of receptor model studies of atmospheric particles in urban areas, especially a recent study of ...
Cass, Glen R., Cooper, John A., Daisey, Joan M., Gordon, Glen E., Lioy, Paul J., Pierson, William R., Watson, John G., Jr.   +6 more
core   +1 more source

Vehicular influence on atmospheric concentrations and source apportionment of polycyclic aromatic hydrocarbons in some major cities in three regions of Ghana using epiphytic lichens

Toxicology Reports, 2022
The present study employed epiphytic lichens as biomonitor and passive air sampler for the assessment of fifteen (15) atmospheric polycyclic aromatic hydrocarbons (PAHs) in some major cities in three regions of Ghana.
Nathaniel Thompson, Joseph Kweku Adjei, John Kwesi Bentum, David Kofi Essumang, Godfred Odame Duodu, George Hadzi, George Alimo Adjei   +6 more
doaj   +1 more source