Index Catalog // ScholarsArchive@OSU

Model of heterogeneous microscale in SOFI for Monte Carlo simulations

Creator:: Gibson, Nathan Louis
Abstract:: We present a methodology for creating a simulated foam microstructure for use in forward simulations of wave equations to quantitatively analyze the expected scattering phenomenon primarily responsible for the attenuation of interrogating signals in Sprayed-On Foam Insulation (SOFI). Our approach builds off of the popular use of Voronoi Tessalations for...
Resource Type:: Technical Report
Full Text:: Nathan L. Gibson May 21, 2007 Abstract We present a methodology for creating a simulated foam

A Polynomial Chaos Method for Dispersive Electromagnetics

Creator:: Gibson, Nathan L.
Abstract:: Electromagnetic wave propagation in complex dispersive media is governed by the time dependent Maxwell’s equations coupled to equations that describe the evolution of the induced macroscopic polarization. We consider “polydispersive” materials represented by distributions of dielectric parameters in a polarization model. The work focuses on a novel computational framework for...
Resource Type:: Article
Full Text:: Electromagnetics N. L. Gibson ∗ Department of Mathematics Oregon State University September 4, 2013 Abstract

Responses and relationships among Fusarium species, sweet corn, and western spotted cucumber beetles

Creator:: Miller, Nathan L. (Nathan Louis)
Abstract:: Sweet corn (Zea mays L.) yields in the Willamette Valley of Oregon have been declining since the early 1990’s. Studies were done to determine if there is a relationship between ear weight and several disease parameters including necrotic crowns or stalk nodes, nodal root rot, radicle root rot, and sub-crown...
Resource Type:: Dissertation
Full Text:: DISSERTATION OF Nathan L. Miller for the degree of Doctor of Philosophy in Botany and Plant Pathology

High-Order Staggered Finite Difference Methods for Maxwell's Equations in Dispersive Media

Creator:: Bokil, Vrushali A. and Gibson, Nathan L.
Abstract:: We study the stability properties of, and the phase error present in, several higher order (in space) staggered finite difference schemes for Maxwell's equations coupled with a Debye or Lorentz polarization model. We present a novel expansion of the symbol of finite difference approximations, of arbitrary (even) order, of the...
Resource Type:: Technical Report
Full Text:: Equations in Dispersive Media V. A. Bokil∗ and N. L. Gibson† Department of Mathematics Oregon State

Stochastic Collocation Error Analysis Within a Kinematic Magnetohydrodynamics Framework

Creator:: Rajbhandari, Evan, Gibson, Nathan L., and Woodside, C. Rigel
Abstract:: We explore one numerical method for dealing with uncertainty quantification, stochastic collocation. We adapt this method for the uncertain kinematic magnetohydrodynamic system. We then demonstrate well-posedness of the uncertain forward problem. We also describe the method in detail, and perform an error analysis of the method, describing the necessary assumptions...
Resource Type:: Preprint
Full Text:: Magnetohydrodynamics Framework Evan Rajbhandari1,2, Nathan Gibson1, and C. Rigel Woodside2 1Department of Mathematics

Quantifying uncertainty with stochastic collocation in the kinematic magentohydrodynamic framework

Creator:: Rajbhandari, Evan, Gibson, Nathan L., and Woodside, C. Rigel
Abstract:: We discuss an efficient numerical method for the uncertain kinematic magnetohydrodynamic system. We include aleatoric uncertainty in the parameters, and then describe a stochastic collocation method to handle this randomness. Numerical demonstrations of this method are discussed. We find that the shape of the parameter distributions affect not only the...
Resource Type:: Preprint
Full Text:: Materials 323 6 651–668 [4] Rajbhandari E, Gibson N, and Woodside C Preprint Stochastic collocation error

Parameter Estimation within a Kinematic Magnetohydrodynamics Framework

Creator:: Rajbhandari, Evan, Gibson, Nathan L., and Woodside, C. Rigel
Abstract:: We discuss the well-posedness of the forward problem for the magnetohydrodynamic system with the inclusion of the ion-slip parameter. We also demonstrate the convergence of a parameter estimation scheme. Focusing on power-generation, we implement and the validate a numerical model with an engineering multi-physics software, COMSOL, using ideal-power equations. We...
Resource Type:: Preprint
Full Text:: Magnetohydrodynamics Framework Evan Rajbhandari1, Nathan Gibson2, and C. Rigel Woodside3 1Department of Mathematics

Dimension reduction of decision variables for multireservoir operation: A spectral optimization model

Creator:: Chen, Duan, Leon, Arturo S., Gibson, Nathan L., and Hosseini, Parnian
Abstract:: Optimizing the operation of a multireservoir system is challenging due to the high dimension of the decision variables that lead to a large and complex search space. A spectral optimization model (SOM), which transforms the decision variables from time domain to frequency domain, is proposed to reduce the dimensionality. The...
Resource Type:: Article
Full Text:: . Leon1, Nathan L. Gibson3, and Parnian Hosseini1 1School of Civil and Construction Engineering, Oregon

Precise interpolar phasing of abrupt climate change during the last ice age

Creator:: Buizert, Christo, Adrian, Betty, Ahn, Jinho, Albert, Mary, Alley, Richard B., Baggenstos, Daniel, Bauska, Thomas K., Bay, Ryan C., Bencivengo, Brian B., Bentley, Charles R., Brook, Edward J., Chellman, Nathan J., Clow, Gary D., Cole-Dai, Jihong, Conway, Howard, Cravens, Eric, Cuffey, Kurt M., Dunbar, Nelia W., Edwards, Jon S., Fegyveresi, John M., Ferris, Dave G., Fitzpatrick, Joan J., Fudge, T. J., Gibson, Chris J., Gkinis, Vasileios, Goetz, Joshua J., Gregory, Stephanie, Hargreaves, Geoffrey M., Iverson, Nels, Johnson, Jay A., Jones, Tyler R., Kalk, Michael L., Kippenhan, Matthew J., Koffman, Bess G., Kreutz, Karl, Kuhl, Tanner W., Lebar, Donald A., Lee, James E., Marcott, Shaun A., Markle, Bradley R., Maselli, Olivia J., McConnell, Joseph R., McGwire, Kenneth C., Mitchell, Logan E., Mortensen, Nicolai B., Neff, Peter D., Nishiizumi, Kunihiko, Nunn, Richard M., Orsi, Anais J., Pasteris, Daniel R., Pedro, Joel B., Pettit, Erin C., Price, P. Buford, Priscu, John C., Rhodes, Rachael H., Rosen, Julia L., Schauer, Andrew J., Schoenemann, Spruce W., Sendelbach, Paul J., Severinghaus, Jeffrey P., Shturmakov, Alexander J., Sigl, Michael, Slawny, Kristina R., Souney, Joseph M., Sowers, Todd A., Spencer, Matthew K., Steig, Eric J., Taylor, Kendrick C., Twickler, Mark S., Vaughn, Bruce H., Voigt, Donald E., Waddington, Edwin D., Welten, Kees C., Wendricks, Anthony W., White, James W. C., Winstrup, Mai, Wong, Gifford J., and Woodruff, Thomas E.
Abstract:: The last glacial period exhibited abrupt Dansgaard–Oeschger climatic oscillations, evidence of which is preserved in a variety of Northern Hemisphere palaeoclimate archives¹. Ice cores show that Antarctica cooled during the warm phases of the Greenland Dansgaard–Oeschger cycle and vice versa[superscript 2,3], suggesting an interhemispheric redistribution of heat through a mechanism...
Resource Type:: Article
Full Text:: . Bencivengo2, Charles R. Bentley8, Edward J. Brook1, Nathan J. Chellman9, Gary D. Clow10, Jihong Cole-Dai11

ScholarsArchive@OSU

Model of heterogeneous microscale in SOFI for Monte Carlo simulations

A Polynomial Chaos Method for Dispersive Electromagnetics

Responses and relationships among Fusarium species, sweet corn, and western spotted cucumber beetles

High-Order Staggered Finite Difference Methods for Maxwell's Equations in Dispersive Media

Stochastic Collocation Error Analysis Within a Kinematic Magnetohydrodynamics Framework

Quantifying uncertainty with stochastic collocation in the kinematic magentohydrodynamic framework

Parameter Estimation within a Kinematic Magnetohydrodynamics Framework

Dimension reduction of decision variables for multireservoir operation: A spectral optimization model

Precise interpolar phasing of abrupt climate change during the last ice age

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