A5022211517- Air Quality and Health Impacts
- Geotechnical Engineering and Underground Structures
- Geotechnical Engineering and Soil Mechanics
- Geotechnical Engineering and Soil Stabilization
- Atmospheric chemistry and aerosols
- Vehicle emissions and performance
- Air Quality Monitoring and Forecasting
- Toxic Organic Pollutants Impact
- Grouting, Rheology, and Soil Mechanics
- Geotechnical Engineering and Analysis
- Noise Effects and Management
- Climate Change and Health Impacts
- Energy and Environment Impacts
- Water Quality and Resources Studies
- Engineering Structural Analysis Methods
- Occupational Health and Performance
- Structural Health Monitoring Techniques
- Groundwater flow and contamination studies
- Indoor Air Quality and Microbial Exposure
- Heavy metals in environment
- Mercury impact and mitigation studies
- Wind and Air Flow Studies
- Landslides and related hazards
- Injury Epidemiology and Prevention
- Geotechnical and construction materials studies
University of Nevada, Reno
2003-2024
Environmental Protection Agency
2011-2021
Vrije Universiteit Amsterdam
2021
VA Office of Research and Development
2006-2020
Triangle
2018
ORCID
2018
Research Triangle Park Foundation
2006-2016
Ohio Environmental Protection Agency
2013
Central Mining Institute
2009
Joint Research Centre
2009
The new version of EPA's positive matrix factorization (EPA PMF) software, 5.0, includes three error estimation (EE) methods for analyzing factor analytic solutions: classical bootstrap (BS), displacement elements (DISP), and enhanced by (BS-DISP). These capture the uncertainty PMF analyses due to random errors rotational ambiguity. To demonstrate utility EE methods, results are presented data sets: (1) speciated PM2.5 from a chemical speciation network (CSN) site in Sacramento, California...
Abstract. The EPA PMF (Environmental Protection Agency positive matrix factorization) version 5.0 and the underlying multilinear engine-executable ME-2 contain three methods for estimating uncertainty in factor analytic models: classical bootstrap (BS), displacement of elements (DISP), enhanced by (BS-DISP). goal these is to capture analyses due random errors rotational ambiguity. It shown that complement each other: depending on characteristics data set, one method may provide better...
Beam on elastic foundation theory provides an efficient solution for the problem of a laterally loaded pile. The accuracy such depends upon characterization interaction between pile and surrounding soil. A particularly good representation soil-pile yields more realistic solution. While traditional nonlinear "p-y" reasonable assessment wide range piles, it has been found that p-y curve (or modulus subgrade reaction) properties (width, shape, bending stiffness, pile-head conditions) as well...
We assessed the relation between beta-carotene consumption at various times in life and breast cancer risk by conducting a case-control study nested within population-based cohort of women screened for Sweden. conducted telephone interview with 273 incident cases 371 controls about their diet ages throughout lifetime. Controls were frequency matched to on age, month year mammography, county residence. used unconditional logistic regression measure association intake while adjusting total...
Fine particle concentration (i.e., particles <2.5 microm in aerodynamic diameter; PM2.5), but not coarse concentration, was associated with increased mortality six U.S. cities. Others criticized this result, arguing that it could result from differences measurement error between the two size ranges. are primarily combustion of fossil fuel, whereras 2.5 and 10 diameter) all crustal material, i.e., dust. One way to determine if a risk for is identify episodes high concentrations coarse, fine,...
In the fall of 2002, an enhanced air monitoring site was established in Steubenville, Ohio as part a multi-year comprehensive mercury and source apportionment study to investigate impact local regional coal combustion sources on atmospheric deposition River Valley. This deployed advanced instrumentation, utilized innovative analytical techniques, applied state-of-the-art statistical receptor models. paper presents wet data modeling results from daily event precipitation samples collected...
The physicochemical properties of coarse-mode, iron-containing particles and their temporal spatial distributions are poorly understood. Single-particle analysis combining X-ray elemental mapping computer-controlled scanning electron microscopy (CCSEM-EDX) passively collected was used to investigate the in Cleveland, OH, summer 2008 (Aug–Sept), 2009 (July–Aug), winter 2010 (Feb–March). most abundant classes were iron oxide fly ash, mineral dust, NaCl-containing agglomerates (likely from road...
Although most designers prefer the p-y curve method as compared to elastic continuum or finite-element analysis of laterally loaded pile behavior, profession has reached a state where it is time that closer scrutiny be given traditional "Matlock-Reese" curves used in analysis. The were derived from number well-instrumented field tests reflect limited set conditions. To consider these unique questionable. As important such have been advancing practice nonlinear beam on foundation analysis,...
Abstract The multivariate receptor model Unmix has been used to analyze a 3-yr PM2.5 ambient aerosol data set collected in Phoenix, AZ, beginning 1995. analysis generated source profiles and overall average percentage contribution estimates (SCEs) for five categories: gasoline engines (33 ± 4%), diesel (16 2%), secondary SO4 2− (19 crustal/soil (22 vegetative burning (10 2%). was supplemented with scanning electron microscopy (SEM) of limited number filter samples information on possible...
As described in this paper, nonparametric wind regression is a source-to-receptor source apportionment model that can be used to identify and quantify the impact of possible regions pollutants as defined by direction sectors. It detail with an example its application SO2 data from East St. Louis, IL. The uses kernel smoothing methods apportion observed average concentration pollutant sectors ranges speed. Formulas are given for uncertainty all important components model, these found give...
The present investigation, carried out as a case study in typical major city situated European coal combustion region (Krakow, Poland), aims at quantifying the impact on urban air quality of residential heating by comparison with other potential pollution sources such power plants, industry, and traffic. Emissions were measured for 20 sources, including small stoves boilers, particulate matter (PM) was analyzed 52 individual compounds together outdoor indoor PM10 collected during winter...
Assessment of the response a laterally loaded pile group based on soil–pile interaction is presented in this paper. The behavior uniform and layered soil (sand and/or clay) evaluated strain wedge model approach that was developed to analyze long flexible under lateral loading. Accordingly, pile's characterized terms three-dimensional which then transformed into its one-dimensional beam elastic foundation equivalent associated parameter (modulus subgrade reaction Es) variation along length....
We present airborne observations of gaseous reactive halogen species (HCl, Cl2, ClNO2, Br2,BrNO2, and BrCl), sulfur dioxide (SO2), nonrefractory fine particulate chloride (pCl) sulfate(pSO4) in power plant exhaust. Measurements were conducted during the Wintertime INvestigation Transport, Emissions, Reactivity campaign February-March 2015 aboard NCAR-NSF C-130 aircraft. Fifty air mass encounters identified which SO2 levels elevated ~5 ppb above ambient background proximity to operational...
The chemical composition of PM2.5 was investigated at four sites (Rubidoux, CA, Phoenix, AZ, Philadelphia, PA, and Research Triangle Park, NC) in January February 1999. Three samplers were used to determine both the overall mass aerosol. Teflon filters weighed for total mass. Ions analyzed using ion chromatography. Elements determined X-ray fluorescence. Organic elemental carbon measured a thermo-optical method. At all sites, reconstructed observed be greater than or equal Good ionic balance...
Abstract This study evaluates the performance of Model 3300 Ogawa Passive Nitrogen Dioxide (NO2) Samplers and 3M 3520 Organic Vapor Monitors (OVMs) by comparing integrated passive sampling concentrations to averaged hourly NO2 volatile organic compound (VOC) measurements at two sites in El Paso, TX. Sampling periods were three time intervals (3-day weekend, 4-day weekday, 7-day weekly) for consecutive weeks. OVM corrected ambient pressure account higher elevation. Precise results (<5%...
Rachelle M. Duvalla, Gary A. Norrisa, Lisa Daileyb, Janet Burkea, John K. McGeeb, Ian Gilmourb, Terry Gordonc & Robert B. Devlinba National Exposure Research Laboratory, U.S. Environmental Protection Agency, Triangle Park, North Carolina, USAb Health and Effects USAc Department of Medicine, New York University School York, USA