Index Catalog // ScholarsArchive@OSU

Contribution from two on-shell pion exchange in nucleon-nucleon scattering

Creator:: Kheaomaingam, Nupan
Abstract:: We used recent phenomenological form factors to calculate the effect of on-shell two-pion exchange in nucleon-nucleon scattering below the two-pion production threshold. As expected, the contributions of partial wave amplitudes are all negligible. We also noticed that the relativistic spin-operator decomposition of the scattering amplitude is not unique at certain...
Resource Type:: Dissertation

A theoretical description of anisotropic chemical association and its application to hydrogen-bonded fluids

Creator:: Peery, Travis B.
Abstract:: The thermodynamic and structural effects of highly anisotropic, short-ranged attraction are investigated for single- and four-site interaction models using Wertheim's multi-density graph theory of chemical association. Both models consist of associating hard spheres, where the saturable attraction sites are described by conical wells centered in the hard core and evaluated...
Resource Type:: Dissertation

Monte Carlo simulations of magnetic semiconducting Superlattices

Creator:: Scott, Silas Menlo
Abstract:: Computer simulations invoking the Metropolis Algorithm and Monte Carlo techniques were constructed to model the behavior ofvarious systems of magnetic semiconductors. Among the systems modeled were bulk type II FCC antiferromagnets and simple cubic thin films and superlattices. Studies of bulk antiferromagnets revealed dependence of Neel Temperature on nearest neighbor...
Resource Type:: Dissertation

Level structure of ¹⁵²Gd populated in ¹⁵²Tb β decay

Creator:: Stapels, Christopher John
Abstract:: As part of a research program to study the transitional region of N=88 isotones, ¹⁵²Tb was produced by the reaction ¹⁵¹Eu(α,3n)¹⁵²Tb in the 88" cyclotron located at LBNL. Gamma-ray spectroscopy of the radiation emitted from excited ¹⁵²Gd following the β⁺ decay of ¹⁵²Tb has been performed using an array of...
Resource Type:: Dissertation

Model of student understanding of probability in modern physics

Creator:: Wattanakasiwich, Pornrat
Abstract:: This study aimed to investigate students' models of probability in a modern physics context. The study was divided into three phases. The first phase explored student pre-knowledge about probability before modem physics instruction. The second phase investigated student understanding of concepts related to probability such as wave-particle behavior, the uncertainty...
Resource Type:: Dissertation

A hierarchical neuro-evolutionary approach to small quadrotor control

Creator:: Shepherd, Jack F., III
Abstract:: Quadrotors are unique among Micro Aerial Vehicles in providing excellent maneuverability (as opposed to winged flight),while maintaing a simple mechanical construction (as opposed to helicopters). This mechanical simplicity comes at a cost of increased controller complexity. Quadrotors are inherently unstable, in the sense that they are essentially unflyable by a...
Resource Type:: Masters Thesis

Determining localized anode condition to maintain effective corrosion protection

Creator:: Nguyen, Vinh
Abstract:: The main objective of the research is to develop a prototype device that can determine the condition of the thermally sprayed zinc anode in cathodic protection systems. The device needs to meet the following requirements: applicability in the field, non-destructiveness or minimal destructiveness of the zinc anode, ease of use...
Resource Type:: Masters Thesis

Analysis and optimal sizing of an energy storage system for wind farm applications

Creator:: Yen, Zuan Z.
Abstract:: Modern wind energy is the technology of choice with a short payback period for increasing renewable energy portfolios. Bonneville Power Administration (BPA), a United States power authority in the Pacific Northwest expects to increase their wind energy capacity from 2,000 megawatts to 6,000 megawatts within the next five years. Currently...
Resource Type:: Masters Thesis

Use of BC-523a liquid scintillator for simultaneous neutron spectroscopy and gamma counting with the implementation of a neutron history reconstruction algorithm

Creator:: Frey, Wesley D.
Abstract:: Real-time, high efficiency neutron spectroscopy has, historically, been a persistent challenge in the field of radiation detection and, for the most part, has gone unsolved. The most promising method to resolve this challenge, is the boron-capture technique using an organic scintillation system (BC-523a). Detectors that utilize this method possess an...
Resource Type:: Dissertation

Student views on science and the scientific process : studying changes made in a redesigned non-major introductory science course

Creator:: Price, Matthew F.
Abstract:: The purpose of this study was to understand how instruction in an introductory nonmajor astronomy course at Oregon State University affects how non-science majors view science and the scientific process. The study used research-based methods to design a reform-based lecture/lab course and implement it for students. Two top-level questions were...
Resource Type:: Dissertation

Electromagnetic properties of anisotropic plasmonic metamaterials

Creator:: Elser, Justin Lee
Abstract:: In this dissertation we study the electromagnetic properties of plasmonic metamaterials. We develop an analytical description to solve the fundamental problem of free-space scattering in planar plasmonic systems by utilizing anisotropic metamaterials. We show with exact numerical simulations that these manufactured materials do completely eliminate the scattering, and even in...
Resource Type:: Dissertation

Sub-diffraction light propagation and imaging in planar negative refraction waveguides

Creator:: Wangberg, Robyn
Abstract:: In this dissertation we study the electromagnetic properties of planar waveguides with non-magnetic strongly anisotropic dielectric cores. We develop an analytical description of the mode propagation in these systems and show that the index of refraction can be either positive or negative depending on the specific material parameters. Propagating modes...
Resource Type:: Dissertation

Exchange interaction studies in magnetic semiconductors by neutron scattering

Creator:: Wiren, Zachary Quincy
Abstract:: Theories predict that making a dilute magnetic semiconductor strongly p -type would allow it to remain ferromagnetic at room temperature. This is of intrest as a ferromagnetic semiconductor would allow for a great many applications in the field of spintronics. Neutron scattering experiments were undertaken to better understand the antiferromagnetic...
Resource Type:: Dissertation

Physical processes that control droplet transport in rock fracture systems

Creator:: Hay, Katrina M.
Abstract:: Aquifer recharge is generally driven by fluids that move from the Earth’s surface to groundwater through the unsaturated zone, also known as the vadose zone. When the vadose zone is fractured, fluids, which may include contaminants, can move through the fracture network as well as the porous matrix. Such a...
Resource Type:: Dissertation

Experimental investigation of condensation phenomena inside a U-tube steam generator

Creator:: Collins, Brian A.
Abstract:: Reflux condensation tests examining steam condensation in a PWR steam generator (SG) were conducted at the Oregon State University (OSU) Advanced Plant Experiment (APEX) Test Facility from 2005 through 2007. The experimental data collected will provide a basis to assess TRACE steam generator modeling techniques and assist in development of...
Resource Type:: Masters Thesis

Mode patterns in quadrupole resonator with anisotropic core

Creator:: Thongrattanasiri, Sukosin
Abstract:: This thesis deals with applications of uniaxial anisotropic crystals for microcavity resonators with partially chaotic underlying ray dynamics. We develop an implementation of the scattering matrix formalism, and relate the eigenvalues and eigenvectors of the scattering matrix to the field distribution of inside the system. Using the developed technique, we...
Resource Type:: Masters Thesis

Simultaneous beta/gamma digital spectroscopy

Creator:: Farsoni, Abdollah T.
Abstract:: A state-of-the-art radiation detection system for simultaneous spectroscopy of beta-particles and gamma-rays has been developed. The system utilizes a triplelayer phoswich detector and a customized Digital Pulse Processor (DPP) built in our laboratory. The DPP board was designed to digitally capture the analog signal pulses and, following several digital preprocessing...
Resource Type:: Dissertation

ScholarsArchive@OSU

Contribution from two on-shell pion exchange in nucleon-nucleon scattering

A theoretical description of anisotropic chemical association and its application to hydrogen-bonded fluids

Monte Carlo simulations of magnetic semiconducting Superlattices

Level structure of ¹⁵²Gd populated in ¹⁵²Tb β decay

Model of student understanding of probability in modern physics

A hierarchical neuro-evolutionary approach to small quadrotor control

Determining localized anode condition to maintain effective corrosion protection

Analysis and optimal sizing of an energy storage system for wind farm applications

Use of BC-523a liquid scintillator for simultaneous neutron spectroscopy and gamma counting with the implementation of a neutron history reconstruction algorithm

Student views on science and the scientific process : studying changes made in a redesigned non-major introductory science course

Electromagnetic properties of anisotropic plasmonic metamaterials

Sub-diffraction light propagation and imaging in planar negative refraction waveguides

Exchange interaction studies in magnetic semiconductors by neutron scattering

Physical processes that control droplet transport in rock fracture systems

Experimental investigation of condensation phenomena inside a U-tube steam generator

Mode patterns in quadrupole resonator with anisotropic core

Simultaneous beta/gamma digital spectroscopy

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