Index Catalog // ScholarsArchive@OSU

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:: polynomial chaos model (34) for an electromagnetic field propagating through a dispersive dielectric media

Polynomial Chaos Expansions for Random Ordinary Differential Equations

Creator:: McKenzie, Brian
Abstract:: We consider numerical methods for finding approximate solutions to Ordinary Differential Equations (ODEs) with parameters distributed with some probability by the Generalized Polynomial Chaos (GPC) approach. In particular, we consider those with forcing functions that have a random parameter in both the scalar and vector case. We then consider linear...
Resource Type:: Capstone Project
Full Text:: Polynomial Chaos Expansions for Random Ordinary

Analysis of fourth order numerical methods for the simulation of electromagnetic waves in dispersive media

Creator:: Henderson, Scott Edward
Abstract:: In this thesis, we investigate the problem of simulating Maxwell's equations in dispersive dielectric media. We begin by explaining the relevance of Maxwell's equations to 21st century problems. We also discuss the previous work on the numerical simulations of Maxwell's equations. Introductions to Maxwell's equations and the Yee finite difference...
Resource Type:: Masters Thesis
Full Text:: Numerical Methods for the Simulation of Electromagnetic Waves in Dispersive Media Abstract approved

Operator splitting methods for Maxwell's equations in dispersive media

Creator:: Keefer, Olivia A.
Abstract:: Accurate modeling and simulation of wave propagation in dispersive dielectrics such as water, human tissue and sand, among others, has a variety of applications. For example in medical imaging, electromagnetic waves are used to interrogate human tissue in a non-invasive manner to detect anomalies that could be cancerous. In non-destructive...
Resource Type:: Masters Thesis
Full Text:: be considered in this thesis for modeling electromagnetic wave propagation in polar dispersive

Electromagnetic Inverse Problem for Relaxation Time Distribution in the Time-Domain

Creator:: Armentrout, Megan
Abstract:: We consider wide bandwidth electromagnetic pulse interrogation problems for the determination of dielectric response parameters in complex dispersive materials. We couple Maxwell’s equations with an auxiliary ODE modeling dielectric polarization. A problem of particular interest is to identify parameters in a standard polarization model (e.g., Debye or Lorentz) using time-domain...
Resource Type:: Capstone Project
Full Text:: generalized Polynomial Chaos in the forward problem. 1 Introduction Electromagnetic (EM) waves are a part of

A Sequential Operator Splitting Method for Electromagnetic Wave Propagation in Dispersive Media

Creator:: Bokil, Vrushali and Leung, Aubrey
Abstract:: In this report we consider the Debye model along with Maxwell's equations (Maxwell-Debye) to model electromagnetic wave propagation in dispersive media that exhibit orientational polarization. We construct and analyze a sequential operator splitting method for the discretization of the Maxwell-Debye system. Energy analysis indicates that the operator splitting scheme is...
Resource Type:: Undergraduate Thesis
Full Text:: A Sequential Operator Splitting Method for Electromagnetic Wave

Analysis of Stability and Dispersion in a Finite Element Method for Debye and Lorentz Dispersive Media

Creator:: Banks, H. T., Bokil, V. A., and Gibson, N. L.
Abstract:: We study the stability properties of, and the phase error present in, a finite element scheme for Maxwell’s equations coupled with a Debye or Lorentz polarization model. In one dimension we consider a second order formulation for the electric field with an ordinary differential equation for the electric polarization added...
Resource Type:: Article
Full Text:: for Debye and Lorentz Dispersive Media H. T. Banks∗ Center for Research in Scientific Computation

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:: . 1 Introduction The computational simulation of electromagnetic interrogation problems, for the

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Creator:: Flugstad, Benjamin A.
Abstract:: Water conservation and water quality are rapidly increasing in importance in all areas of the world. The ability to accurately measure soil water content and salinity, over a wide variety of conditions, is key to meeting this need. A set of forward prediction models and waveform interpretation algorithms to extract...
Resource Type:: Dissertation
Full Text:: for Dispersive Media using Enhanced Time Domain and Frequency Domain Models AN

Three dimensional electromagnetic FDTD simulation of general lossy structures with nonuniform grid spacing

Creator:: Falconer, Maynard C.
Abstract:: A new second order accurate nonuniform grid spacing technique which does not depend on supraconvergence is developed for Finite Difference Time Domain (FDTD) simulation of general three dimensional structures. The technique is useful for FDTD simulations of systems which require finer details in small regions of the simulation space by...
Resource Type:: Dissertation
Full Text:: using the FDTD method has already been performed by the electromagnetic community for microwave

Qualitative Analysis of Maxwell-Duffing Models in Nonlinear Optics

Creator:: Tro, Sara K.
Abstract:: In this thesis we analyze a model for Kerr optical materials consisting of Maxwell's equations along with the dispersive Duffing model. We consider Duffing models with cubic and quintic polynomial nonlinearities. We assume a traveling wave solution to this nonlinear electromagnetic system and analyze it using the theory of dynamical...
Resource Type:: Honors College Thesis
Full Text:: the dispersive Duffing model. We consider Duffing models with cubic and quintic polynomial

Multiscale Methods and Energy Stable Discretizations for Maxwell’s Equations in Linearand Nonlinear Materials

Creator:: Sakkaplangkul, Puttha
Abstract:: In this dissertation, we introduce a family of fully discrete finite difference time-domain (FDTD) methods for Maxwell’s equations in linear and nonlinear materials. Onecategory of methods is constructed using multiscale techniques involving operator splittings. We present the sequential splitting scheme, the Strang Marchuk splitting scheme,the weighted sequential splitting scheme including...
Resource Type:: Dissertation
Full Text:: operator splitting schemes based on energy techniques for Maxwell’s equations in linear non-dispersive and

Compatible Discretizations for Maxwell's Equations with General Constitutive Laws

Creator:: McGregor, D. A.
Abstract:: In this thesis we construct compatible discretizations of Maxwell's equations. We use the term compatible to describe numerical methods for Maxwell's equations which obey many properties of vector Calculus in a discrete setting. Compatible discretizations preserve the exterior Calculus ensuring that the divergence of the curl and the curl of...
Resource Type:: Dissertation
Full Text:: essence, these laws will relate various electromagnetic variables to one another. We consider for the

Virtual Element Methods for Magnetohydrodynamics on General Polygonal and Polyhedral Meshes

Creator:: Naranjo, Sebastián
Abstract:: The aim of this dissertation is to construct a virtual element method (VEM) for models in magneto-hydrodynamics (MHD), an area that studies the behavior and properties of electrically conducting ﬂuids such as a plasma. MHD models are a coupling of the Maxwell’s equations for electromagnetics and models for ﬂuid ﬂow....
Resource Type:: Dissertation
Full Text:: electromagnetics and models for fluid flow. First we consider a simplified resistive MHD sub- model where we

Enabling metal-fill-aware design of integrated circuits

Creator:: Shilimkar, Vikas S.
Abstract:: In advanced integrated circuit (IC) processes, the metal fill inserted to meet foundry imposed density requirements degrades the performance of interconnects and passive components which ultimately affects the overall circuit performance. Accounting for this degradation through electromagnetic and equivalent circuit modeling is becoming a critical aspect of IC design. However,...
Resource Type:: Dissertation
Full Text:: Vikas S. Shilimkar for the degree of Doctor of Philosophy in Electrical and Computer Engineering

Dispersion reducing methods for edge discretizations of the electric vector wave equation

Creator:: Bokil, V. A., Gibson, N. L., Gyrya, V., and McGregor, D. A.
Abstract:: We present a novel strategy for minimizing the numerical dispersion error in edge discretizations of the time-domain electric vector wave equation on square meshes based on the mimetic finite difference (MFD) method. We compare this strategy, called M-adaptation, to two other discretizations, also based on square meshes. One is the...
Resource Type:: Article
Full Text:: Dispersion reducing methods for edge

Analysis and modeling of microstrip on-chip interconnects on silicon substrate

Creator:: Lan, Hai
Abstract:: The electrical performance of on-chip interconnects has become a limiting factor to the performance of modern integrated circuits including RFICs, mixed-signal circuits, as well as high-speed VLSI circuits due to increasing operating frequencies, chip areas, and integration densities. It is advantageous to have fast and accurate closed-form expressions for the...
Resource Type:: Masters Thesis
Full Text:: Redacted for Privacy in good agreement with full-wave and quasi-static electromagnetic solutions. Based

Computational nanooptics in hyperbolic metamaterials and plasmonic structures

Creator:: Thongrattanasiri, Sukosin
Abstract:: This dissertation concerns several problems in the fields of light interaction with nanostructured media, metamaterials, and plasmonics. We present a technique capable of extending operational bandwidth of hyperbolic metamaterials based on interleaved highly-doped InGaAs and undoped AlInAs multilayer stacks. The experimental results confirm theoretical predictions, exhibiting broadband negative refraction response...
Resource Type:: Dissertation
Full Text:: permittivity and permeability for microwave frequencies [19-25]. When electromagnetic fields propagate inside

An Analysis Platform for Multiscale Hydrogeologic Modeling with Emphasis on Hybrid Multiscale Methods

Creator:: Scheibe, Timothy D., Murphy, Ellyn M., Chen, Xingyuan, Rice, Amy K., Carroll, Kenneth C., Palmer, Bruce J., Tartakovsky, Alexandre M., Battiato, Ilenia, and Wood, Brian D.
Abstract:: One of the most significant challenges faced by hydrogeologic modelers is the disparity between the spatial and temporal scales at which fundamental flow, transport, and reaction processes can best be understood and quantified (e.g., microscopic to pore scales and seconds to days) and at which practical model predictions are needed...
Resource Type:: Article
Full Text:: Platform for Multiscale Hydrogeologic Modeling with Emphasis on Hybrid Multiscale Methods An Analysis

Venturing Beyond Crystallinity and Into Amorphous Space : A Na-ion Battery Perspective

Creator:: Bommier, Clement
Abstract:: As scientists, we have an affinity for order: repeating crystal structures, Euclidean space, continuous functions… Even concepts such as defects are discussed in the context of distracting from order. Things are most logical and best described in straightforward, taxonomical fashion. But what happens when the very application desired is dependent...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Clement Bommier for the

Optimization under Uncertainty of a Magnetohydrodynamics Generator

Creator:: Rajbhandari, Evan
Abstract:: Within this dissertation, we develop tools and techniques to demonstrate the feasibility of real-time optimization of a magnetohydrodynamics generator. To ease computational complexity, we work on the kinematic magnetohydrodynamic system, prescribing the ﬂuid-ﬂow and model the material response of the system through an updated Generalized Ohm’s law. We focus on...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Evan Rajbhandari for the

Addressing Data Resolution in Precision Agriculture

Creator:: Kelley, Jason
Abstract:: Irrigated agriculture constitutes the greatest consumptive water use globally, so that irrigation efficiency measures are an important part of global efforts to best utilize this limited resource. However, greater irrigation efficiency must be achieved while simultaneously maintaining or increasing crop yields and farming profitability. Incremental water use decisions are made...
Resource Type:: Dissertation
Full Text:: Kelley for the degree of Doctor of Philosophy in Water Resource Engineering presented on September 1

Chemical Reaction Processes in Microscale-Based Reactors; Mathematical Model and Numerical Simulation of the Fischer-Tropsch Process and Activation of Methane in a Corona Discharge Plasma Reactor

Creator:: Traverso, Andrew C.
Abstract:: Worldwide production of natural gas has surged in the last few decades leading to an economic windfall for many communities, but sometimes these new sources of natural gas are located in geographically isolated locations. These areas are so remote that it isn’t economically feasible to transport this stranded gas to...
Resource Type:: Dissertation
Full Text:: for the degree of Doctor of Philosophy in Chemical Engineering presented on December 22, 2020

Hard spheres within classical density functional theory and Min proteins in Escherichia coli

Creator:: Schulte, Jeff B.
Abstract:: This thesis reports on computational research in two different areas. I first discuss the Min-protein system found within Escherichia coli. Following this I discuss an extended investigation into improving free energy functionals that are used within Classical Density Functional Theory in order to model water. Chapter 2 examines the dynamics...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Jeff B. Schulte for the

Metamorphosis, growth, and settlement of Pacific sanddab (Citharichthys sordidus) to a continental shelf nursery, inferred from otolith microstructure

Creator:: Donohoe, Christopher James
Abstract:: Processes of metamorphosis, settlement, and growth were examined in Pacific sanddab using field studies and otolith microstructure. This flatfish transforms at large sizes, has a gradual metamorphosis, and settles to a nursery on the middle continental shelf. Eye migration takes 3 months and "metamorphosis proper" which begins after completion of...
Resource Type:: Dissertation
Full Text:: (LLD) for elements measured by the wavelength dispersive electron microprobe

General Catalog 2017-2018

Creator:: Oregon State University
Resource Type:: Other
Full Text:: copy of and click the Print Version icon and follow the subsequent instructions. For archived copies

General Catalog 2016-2017

Creator:: Oregon State University
Resource Type:: Other
Full Text:: copy of and click the Print Version icon and follow the subsequent instructions. For archived copies

Boundaries of research : civilian leadership, military funding, and the international network surrounding the development of numerical weather prediction in the United States

Creator:: Harper, Kristine C.
Abstract:: American meteorology was synonymous with subjective weather forecasting in the early twentieth century. Controlled by the Weather Bureau and with no academic programs of its own, the few hundred extant meteorologists had no standing in the scientific community. Until the American Meteorological Society was founded in 1919, meteorologists had no...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Kristine C. Harper for the

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