Open Access. Powered by Scholars. Published by Universities.®
- Publication
- Publication Type
Articles 1 - 5 of 5
Full-Text Articles in Engineering
Evaluation Of Nitrous Acid Sources And Sinks In Urban Outflow, Elliott T. Gall, Robert J. Griffin, Allison L. Steiner, Jack Dibb, Eric Scheuer, Longwen Gong, Andrew P. Rutter, Basak K. Cevik, Saewung Kim, Barry Lefer, James Flynn
Evaluation Of Nitrous Acid Sources And Sinks In Urban Outflow, Elliott T. Gall, Robert J. Griffin, Allison L. Steiner, Jack Dibb, Eric Scheuer, Longwen Gong, Andrew P. Rutter, Basak K. Cevik, Saewung Kim, Barry Lefer, James Flynn
Mechanical and Materials Engineering Faculty Publications and Presentations
Intensive air quality measurements made from June 22–25, 2011 in the outflow of the Dallas–Fort Worth (DFW) metropolitan area are used to evaluate nitrous acid (HONO) sources and sinks. A two-layer box model was developed to assess the ability of established and recently identified HONO sources and sinks to reproduce observations of HONO mixing ratios. A baseline model scenario includes sources and sinks established in the literature and is compared to scenarios including three recently identified sources: volatile organic compound-mediated conversion of nitric acid to HONO (S1), biotic emission from the ground (S2), and re-emission from a surface nitrite reservoir …
Tracking Rhythmicity In Biomedical Signals Using Sequential Monte Carlo Methods, Sungan Kim
Tracking Rhythmicity In Biomedical Signals Using Sequential Monte Carlo Methods, Sungan Kim
Dissertations and Theses
Cyclical patterns are common in signals that originate from natural systems such as the human body and man-made machinery. Often these cyclical patterns are not perfectly periodic. In that case, the signals are called pseudo-periodic or quasi-periodic and can be modeled as a sum of time-varying sinusoids, whose frequencies, phases, and amplitudes change slowly over time. Each time-varying sinusoid represents an individual rhythmical component, called a partial, that can be characterized by three parameters: frequency, phase, and amplitude. Quasi-periodic signals often contain multiple partials that are harmonically related. In that case, the frequencies of other partials become exact integer multiples …
Incentives, Information, And Winner's Curse In Construction Industry Bidding, Gerald H. Williams, Timothy R. Anderson
Incentives, Information, And Winner's Curse In Construction Industry Bidding, Gerald H. Williams, Timothy R. Anderson
Engineering and Technology Management Faculty Publications and Presentations
This paper investigates the relationship between incentives, information and winner's curse in the bidding for construction industry contracts. The approach uses both simple Monte Carlo simulations and bidding experiments to show the effects of changing levels of information (in terms of variance) and incentive (in terms of risk share) on the winner's curse.
Scattering Properties Of Dense Media From Monte Carlo Simulations With Application To Active Remote Sensing Of Snow, Lisa M. Zurk, L. Tsang, Dale P. Winebrenner
Scattering Properties Of Dense Media From Monte Carlo Simulations With Application To Active Remote Sensing Of Snow, Lisa M. Zurk, L. Tsang, Dale P. Winebrenner
Electrical and Computer Engineering Faculty Publications and Presentations
Monte Carlo simulations are used to derive the phase matrix, effective permittivity, and scattering coefficient for a random medium consisting of densely packed spheres up to 5000 in number. The results include correlated scattering and coherent wave interaction among the scatterers. The Monte Carlo simulations are based on a multiple-scattering formulation of the Foldy-Lax equations. It is shown that the derived phase matrix is in good agreement with dense media radiative transfer theory for copolarized scattering. The depolarization, however, can be substantially larger than conventional theory. Two methods are used to analyze the behavior of the coherent wave to obtain …
Monte Carlo Simulations Of The Extinction Rate Of Densely Packed Spheres With Clustered And Nonclustered Geometries, Lisa M. Zurk, L. Tsang, K. H. Ding, Dale P. Winebrenner
Monte Carlo Simulations Of The Extinction Rate Of Densely Packed Spheres With Clustered And Nonclustered Geometries, Lisa M. Zurk, L. Tsang, K. H. Ding, Dale P. Winebrenner
Electrical and Computer Engineering Faculty Publications and Presentations
Scattering and absorption coefficients are presented from Monte Carlo simulations of electromagnetic wave propagation in a volume of densely packed, random dielectric, absorptive spheres. The particles are modeled both with and without a surface adhesion that causes them to form clustered groups. Results for scatterer densities greater than a few percent by volume differ significantly from those obtained under the independentscattering assumption. The extinction rates agree well with analytic dense-medium theory. Results also show that, on account of local fields experienced by the particles, the system absorption is different from that predicted with an assumption of independent absorption. Scattering is …