FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2918873075> ?p ?o ?g. }

• W2918873075 abstract "Author(s): Lin, Yue | Advisor(s): Jung, Heejung | Abstract: The exposure to particulate matter (PM) has strong adverse health effects, such as aggravated asthma, decrease in lung function, and increase respiratory symptoms. PM is complex and dynamic in its chemical composition and physical mixing state. The properties of PM have not been thoroughly characterized, and the mechanism of PM causing adverse effect has not been well understood. This study focuses on characterizing physical properties of urban background air particles by analyzing the particle spectra, particle effective density, black carbon, and active surface area along with chemical characterization using AMS. The effective density profiles were used to estimate the respiratory system-deposited ambient particle mass according to lung deposition fraction curve reported by ICRP (1994).The first study was to determine size-resolved effective densities of ambient aerosols in Riverside, CA for four 7-day periods during 2015 – 2016. The mass of size selected particles (50, 70, 101 and 152 nm) were measured to determine the effective density for particles. A catalytic stripper (CS) in alternating mode was used to remove volatile compounds on the aerosol before density measurements. Aerosol non-refractory composition measurement was conducted in June 2016 campaign to understand the effect of chemical composition on particle density. The average particle densities for all measurement campaigns with CS bypassing mode (BP) were 1.17 g/cm3 at 50 nm and 1.25 – 1.28 g/cm3 at 70, 101 and 152 nm. The average density after CS conditioning (CS mode) showed a decreasing trend from 1.22 g/cm3 to 1.04 g/cm3 withincreasing selected size, and a mass fractal dimension (Df) of 2.85. Both the BP and CS mode particles showed the lowest effective density from 6:00 AM to 9:00 AM and highest density from 11:00 AM to 3:00 PM. The diurnal variation of density became more profound as particle size increases for both sampling modes. The variation was found to be more intense for the CS mode compared than the BP mode. To confirm this observation, organic aerosol and ammonium nitrate mass in the similar size range were tested simultaneously with BP mode. The results showed effective density measurements correlated well with positively (R2=0.78) and negatively (R2=0.62). This study provided an update to the aerosol density profiles of a well-known receptor site (Riverside, CA) and investigated the transformation of particles in different seasons. The obtained effective density profiles were used in the proceeding study in order to effectively estimate the respiratory-deposited ambient aerosol mass. In the second study, the size distributions and effective densities of ambient particles measured in September 2015 and June 2016 were used to calculate time-dependent lung deposited particulate matter (PM) mass using lung deposition fraction curve reported by ICRP (1994). The particle active surface area, black carbon (BC) mass, particle number (PN), solid particle number (SPN), and suspended PM mass (from particle size distributions and effective densities) were also obtained to investigate correlations with PM dose. Non-refractory organic and inorganic mass measured by an aerosol mass spectrometer (mAMS) provided additional information in relation to dose versus chemical nature of particles.Ambient particle size distributions showed strong diurnal variations during the sampling period. While the lung deposited PM mass fraction (0.32-0.36) did not vary much with time, lung deposited and suspended PM mass in the ambient air showed similar trend. Deposition in the alveolar region was the highest (0.3-1.0 μg/m3), which was followed by the nasal region (0.16 – 0.83 μg/m3) and tracheobronchial region (0.05 – 0.27 μg/m3). All three regions peaked at 12:00 PM – 6:00 PM and reached the lowest value near midnight.One of the goals of this study was to consider the most prominent ambient PM measurement method in consideration to health and lung deposition. Suspended PM mass had the highest correlation with respiratory doses, which was followed by organics measured using mAMS, active surface area, and BC mass. It is also found that particle hygroscopicity did not affect correlations between metrics and lung deposited PM mass. By taking into account the accessibility and cost of these measurements, we propose the particle active surface area and BC mass to be considered when evaluating/monitoring the health effects caused by PM." @default.
• W2918873075 created "2019-03-11" @default.
• W2918873075 creator A5039087352 @default.
• W2918873075 date "2018-01-01" @default.
• W2918873075 modified "2023-09-24" @default.
• W2918873075 title "Investigation of Particle Effective Density, Size Distribution and Dose Metric of Ambient Aerosol" @default.
• W2918873075 hasPublicationYear "2018" @default.
• W2918873075 type Work @default.
• W2918873075 sameAs 2918873075 @default.
• W2918873075 citedByCount "0" @default.
• W2918873075 crossrefType "journal-article" @default.
• W2918873075 hasAuthorship W2918873075A5039087352 @default.
• W2918873075 hasConcept C107872376 @default.
• W2918873075 hasConcept C111368507 @default.
• W2918873075 hasConcept C113196181 @default.
• W2918873075 hasConcept C121332964 @default.
• W2918873075 hasConcept C126857682 @default.
• W2918873075 hasConcept C127313418 @default.
• W2918873075 hasConcept C135649769 @default.
• W2918873075 hasConcept C144352136 @default.
• W2918873075 hasConcept C147789679 @default.
• W2918873075 hasConcept C149849071 @default.
• W2918873075 hasConcept C150032891 @default.
• W2918873075 hasConcept C178790620 @default.
• W2918873075 hasConcept C185592680 @default.
• W2918873075 hasConcept C187530423 @default.
• W2918873075 hasConcept C199289684 @default.
• W2918873075 hasConcept C20556612 @default.
• W2918873075 hasConcept C24245907 @default.
• W2918873075 hasConcept C2778517922 @default.
• W2918873075 hasConcept C2779345167 @default.
• W2918873075 hasConcept C60448018 @default.
• W2918873075 hasConcept C74412414 @default.
• W2918873075 hasConcept C97355855 @default.
• W2918873075 hasConceptScore W2918873075C107872376 @default.
• W2918873075 hasConceptScore W2918873075C111368507 @default.
• W2918873075 hasConceptScore W2918873075C113196181 @default.
• W2918873075 hasConceptScore W2918873075C121332964 @default.
• W2918873075 hasConceptScore W2918873075C126857682 @default.
• W2918873075 hasConceptScore W2918873075C127313418 @default.
• W2918873075 hasConceptScore W2918873075C135649769 @default.
• W2918873075 hasConceptScore W2918873075C144352136 @default.
• W2918873075 hasConceptScore W2918873075C147789679 @default.
• W2918873075 hasConceptScore W2918873075C149849071 @default.
• W2918873075 hasConceptScore W2918873075C150032891 @default.
• W2918873075 hasConceptScore W2918873075C178790620 @default.
• W2918873075 hasConceptScore W2918873075C185592680 @default.
• W2918873075 hasConceptScore W2918873075C187530423 @default.
• W2918873075 hasConceptScore W2918873075C199289684 @default.
• W2918873075 hasConceptScore W2918873075C20556612 @default.
• W2918873075 hasConceptScore W2918873075C24245907 @default.
• W2918873075 hasConceptScore W2918873075C2778517922 @default.
• W2918873075 hasConceptScore W2918873075C2779345167 @default.
• W2918873075 hasConceptScore W2918873075C60448018 @default.
• W2918873075 hasConceptScore W2918873075C74412414 @default.
• W2918873075 hasConceptScore W2918873075C97355855 @default.
• W2918873075 hasLocation W29188730751 @default.
• W2918873075 hasOpenAccess W2918873075 @default.
• W2918873075 hasPrimaryLocation W29188730751 @default.
• W2918873075 hasRelatedWork W1892500742 @default.
• W2918873075 hasRelatedWork W2122244167 @default.
• W2918873075 hasRelatedWork W2122462507 @default.
• W2918873075 hasRelatedWork W2145881358 @default.
• W2918873075 hasRelatedWork W2285500614 @default.
• W2918873075 hasRelatedWork W2361078359 @default.
• W2918873075 hasRelatedWork W2363539130 @default.
• W2918873075 hasRelatedWork W2391503509 @default.
• W2918873075 hasRelatedWork W2624695585 @default.
• W2918873075 hasRelatedWork W2744321697 @default.
• W2918873075 hasRelatedWork W2769388504 @default.
• W2918873075 hasRelatedWork W2774639464 @default.
• W2918873075 hasRelatedWork W2791577995 @default.
• W2918873075 hasRelatedWork W2803470480 @default.
• W2918873075 hasRelatedWork W2807604413 @default.
• W2918873075 hasRelatedWork W2896553598 @default.
• W2918873075 hasRelatedWork W2905467089 @default.
• W2918873075 hasRelatedWork W2991338143 @default.
• W2918873075 hasRelatedWork W2998853946 @default.
• W2918873075 hasRelatedWork W3038293574 @default.
• W2918873075 isParatext "false" @default.
• W2918873075 isRetracted "false" @default.
• W2918873075 magId "2918873075" @default.
• W2918873075 workType "article" @default.