Index Catalog // ScholarsArchive@OSU

Variable Temperature Transport Measurements and Conduction Mechanisms of Crystalline and Amorphous Titanium Dioxide Thin Films

Creator:: Patterson, Acacia M.
Abstract:: The electrical properties of amorphous and crystalline titanium dioxide polymorphs are reported. Titanium dioxide is a widely used transparent semiconductor and it is a useful oxide model. Using variable temperature transport measurements of thin films, it was possible to establish the activation energy barrier for conduction. This was accomplished using...
Resource Type:: Undergraduate Thesis

Using the Langevin Equation to Verify a Single-Particle Brownian Motion Simulation

Creator:: Snyder, Brendan
Abstract:: Brownian motion is the movement of a particle in a fluid resulting from collisions with surrounding molecules. It has modern applications in simulating fluid dynamics and the motion of proteins in biophysics. Brownian motion simulations generally evolve the initial state by applying Newton’s second law to every particle. These simulations...
Resource Type:: Undergraduate Thesis

Use of a digital micromirror array as a configurable mask in optical astronomy

Creator:: Gilliam, Shawn
Abstract:: High resolution images of a dim companion in a binary star system can be obtained using a Digital Micromirror Array (DMA) as an optical mask. Imaging can be problematic because the intense light from the main star can saturate the detector and leave the companion unnoticed. Placement of the DMA...
Resource Type:: Undergraduate Thesis

Understanding change: surface manipulative-activities as a tool for addressing student difficulties in thermodynamics

Creator:: Siegel, Reese R.
Abstract:: Multivariable functions permeate physics, mathematics, and other sciences. Understanding how quantities in multivariable relationships change together – or co-vary – is important for studying physical systems. In this project, we asked junior-level physics majors to describe the covariation of quantities in a multivariable context given a 2D graph. We identified...
Resource Type:: Undergraduate Thesis

Travelling Wave Analysis of Nonlinear Maxwell Models with Applications to Nonlinear Optics

Creator:: Langlie, Noah
Abstract:: In 1877 John Kerr described an experiment that demonstrated a quadratic change in refractive index in a plate glass placed in a strong external electric field. This results in a nonlinear relationship between the average electric polarization within the materials and the intensity of the applied electric field. This opened...
Resource Type:: Undergraduate Thesis

Towards Molybdenum Disulfide Exciton-Polaritons in Metallic Microcavities

Creator:: Embleton, Clark
Abstract:: Exciton-polaritons are a form of light-matter coupling that have potential applications as photonic transistors and logic gates. In order for a photonic transistor or logic gate to be integrated with room temperature fiber-optic technology, excitons-polaritons need to be stable at room temperature and compatible with the red and near-infrared wavelengths...
Resource Type:: Undergraduate Thesis

Time resolved terahertz spectroscopy of photocarrier dynamics in WSe2

Creator:: Johnson, Nathan
Abstract:: Semiconductors serve an integral role in our technologies today. However, with new advancements in ultra-fast electronics, we are approaching the fundamental speed limits of traditional silicon-based semiconductors. Silicon-based semiconductors typically exhibit photocarrier dynamics in nanosecond timescales. Transition metal dichalcogenides (TMDs) are 2D materials shown to exhibit photocarrier dynamics in picosecond...
Resource Type:: Undergraduate Thesis

This is a bassoon. Bassoon recital.

Creator:: Van Hatten, Sean
Abstract:: Rectial Program | Scherzo - Oleg Miroshnikov | Syrinx - Claude Debussy | Bachianas Brasileiras No. 6 - Heitor Villa-Lobos (Feat. Kaleigh Hull on flute) | Turkisher March - Christian Julius Weissenborn (Feat. Annie Kosanovic-Brown, Andrew McKelvey on bassoon) | Pizzicati Polka - Leo Delibes (DeArr. Mark Eubanks) (Feat. Annie...
Resource Type:: Video

Thermoelectric Properties of the HeterostructuralAlloy Sn_(1-x)Ca_(x)Se

Creator:: Forkner, MIchael
Abstract:: By alloying face centered cubic CaSe with orthorhombic SnSe, we created the heterostructural alloy Sn1-xCaxSe. The phase separated lms created with a high deposition temperature acted as highly crys- talline SnSe while the low deposition temperature lms acted as a mix of SnSe and CaSe. For the alloyed lms we...
Resource Type:: Undergraduate Thesis

The Two Wells System: A Benchmark for Monte Carlo Methods in Statistical Mechanics

Creator:: Sprueill, Henry
Abstract:: Computational statistical mechanics leans heavily on the class of Markov Chain Monte Carlo Algorithms. Many such algorithms exist, and simulations can run for several weeks, making the selection of algorithms a difficult, but critical task. In this work, we introduce a benchmark system of two quadratic wells with an analytical...
Resource Type:: Undergraduate Thesis

The interaction of bulk heterojunction donor/acceptor blends with polaritonic state creation in organic crystalline films

Creator:: Center, Reid
Abstract:: We explore the interactions between charge transfer exciton states (CTEs) and an optical microcavity by testing the effects that cavity resonance has on the CTEs and if CTEs can be coupled with a photon to create quasiparticles known as polaritons. Exciton polaritonics is becoming a booming area of research mainly...
Resource Type:: Undergraduate Thesis

The Impact of Crystal Morphology on the Opto-Electronic Properties of Amorphous and Organic Crystalline Materials

Creator:: Brandt, Gregory Mirek
Abstract:: Organic aggregates and transparent amorphous metals are transforming opto-electronic devices such as highly efficiency solar cells and flexible displays. We present a fundamental optical study of how local morphology critically impacts the device performance of both stacked, conjugated organics and In-Ga-Zn-O (IGZO) transparent metallic materials. Derivatives of anthradithiophene (ADT): ADTTES-F,...
Resource Type:: Undergraduate Thesis

The Geometry of the Penrose Diagram for Minkowski Spacetime

Creator:: Siebersma, Maxwell
Abstract:: Culture of Writing Award in Mathematics (2022)
Resource Type:: Technical Report

The contact value approximation to the pair distribution function for an inhomogeneous hard sphere fluid

Creator:: Lurie-Gregg, Paho
Abstract:: We construct the contact value approximation (CVA) for the pair distribution function, g(²)(r₁, r₂), for an inhomogeneous hard sphere fluid. The CVA is an average of two radial distribution functions, which each take as input the distance between the particles, |r₂ −r₁|, and the average value of the radial distribution...
Resource Type:: Undergraduate Thesis

The Consistent Histories Approach to the Stern-Gerlach Experiment

Creator:: Wilson, Ian
Abstract:: Standard quantum mechanics makes foundational assumptions to describe the measurement process. Upon interaction with a “classical measurement apparatus”, a quantum system is subjected to postulated “state collapse” dynamics. We show that framing measurement around state collapse and ill-defined classical observers leads to interpretational issues, and artificially limits the scope of...
Resource Type:: Undergraduate Thesis

Testing, Development, and First Results of a Method for Measurement of the Isotropy of the One-Way Speed of Light.

Creator:: Nowak, Gabriel
Abstract:: The standard model (SM) of particle physics describes many of the experimentally observed subatomic particle interactions. However, there are a few discrepancies with the SM namely: matter/antimatter asymmetry and dark energy. A current extension of the SM allows for small amounts of Lorentz Violation to fix these discrepancies. Lorentz Violating...
Resource Type:: Undergraduate Thesis

Terahertz field enhancement in nanoantennas on gallium arsenide

Creator:: Brequigny, Victor
Abstract:: Terahertz (THz) spectroscopy is a great tool not only to study fundamental physical processes such as many-body Coulomb interaction but also to develop ultrafast electronic devices. More specifically, intense THz fields interacting with semiconductors have exhibited strong nonlinear effect involving extreme carrier dynamics. In this experiment, intense THz radiation was...
Resource Type:: Undergraduate Thesis

Temperature Dependence of Cu₃₋xSb₁₋[subscript y]M[subscript y]S₄ (M=Sn,Ge) Resistivity and Thermopower

Creator:: Mutch, Joshua
Abstract:: An experimental apparatus is modified to allow measurements of the Seebeck coefficient and resistivity to be taken simultaneously. This apparatus is designed for bulk and thin film samples between temperatures of 10 K and 300 K. The apparatus is constructed such that these simultaneous measurements do not interfere with each...
Resource Type:: Undergraduate Thesis

Teaching Gravitational Potential Energy: Student Interaction with Surface Manipulatives

Creator:: Kimbrough, Abigail E.
Abstract:: Past studies have shown that students struggle with main concepts of potential energy, such as reading graphs, understanding that potential energy can be negative, and, most pertinent to this research project, connecting potential energy to force. I designed an activity to help introductory physics students address these struggles. The activity...
Resource Type:: Undergraduate Thesis

Synchronized Cellular Mechanosensing due to External Periodic Driving

Creator:: Chase, Katelyn J.
Abstract:: The response of cells to periodic driving is important for many biological processes, particularly blood flow and heart functioning. Our research analyzes the collective shear stress response of fibroblast cells due to a periodic driving frequency. When cells experience shear stress, they release calcium into the cytosol. To quantify the...
Resource Type:: Undergraduate Thesis

Study of Organic Semiconductors Using Time-Resolved Charge Measurements at the Microscale

Creator:: Wallace, Richard
Abstract:: Understanding charge transfer in organic semiconductors is important for developing devices like organic light emitting diodes and flexible electronics. Optical tweezers have been used in many disciplines for trapping, manipulating, and analyzing microscopic objects such as microspheres, micro-organisms, and other colloidal particles. Using optical tweezers, studies have measured the average...
Resource Type:: Undergraduate Thesis

Student interaction with online pre-lecture videos and how it influences grades

Creator:: Petersen, Allyson
Abstract:: This study examines how students were interacting with pre-lecture videos via the BoxSand website. Students of the Fall 2015 and Fall 2016 introductory physics courses at Oregon State University were studied. The course was taught as a flipped classroom in which the instructional material was provided via BoxSand. BoxSand is...
Resource Type:: Undergraduate Thesis

Spectroscopic Ellipsometry on Thin Films of TiO2: Comparing Cauchy and Cody-Loretnz Models in CompleteEASE

Creator:: Kreb, Joseph
Abstract:: Spectroscopic ellipsometry (SE) is used to characterize amorphous and crystalline thin films of TiO2. Amorphous precursor films of TiO2 are deposited by radio frequency magnetron sputtering on fused silica and silicon substrates. Annealing the amorphous precursor films induces them to crystallize into either pure or mixed phases of the three...
Resource Type:: Undergraduate Thesis

Spatial and Temporal Damping of Fluid Perturbation at a Distance

Creator:: Baldwin, Andy
Abstract:: A recent article by Cozzi and Kelliher [3] has demonstrated a sense of "locality" to the incompressible Euler equations which mirrors physical fluid behavior. We further develop the corresponding notion of "damping," and identify both temporal and local damping behaviors. To represent this problem, we perturb the initial condition of...
Resource Type:: Undergraduate Thesis

Solution method and error evolution of student responses to chain rule problems within a thermodynamics course

Creator:: Founds, Ian, W and Founds, Ian W.
Abstract:: Chain rules are critical to the process of solving many thermodynamics-related partial derivatives. This study evaluates the solution method and error evolution of students’ responses to a pair of chain rule problems in an upper-level undergraduate thermodynamics course. Students’ responses were categorized by solution method. Students’ solution methods included implicit...
Resource Type:: Undergraduate Thesis

Single-Molecule Analysis of a Novel Kinesin MotorProtein

Creator:: Meinke, Jeremy
Abstract:: Kinesins are intracellular motor proteins that transform chemical energy into mechanical energy through ATP hydrolysis to move along microtubules. Kinesin roles can vary among transportation, regulation, and spindle alignment within most cells. Many kinesin have been found to move towards the plus end of microtubules at a steady velocity. For...
Resource Type:: Undergraduate Thesis

Simulating the Dynein Motor Protein: A Monte Carlo Approach to Achieve Coordinated Stepping

Creator:: Kiatvongcharoen, Jin
Abstract:: The motor protein dynein is responsible for cellular processes such as axonal transport and cell division by delivering vital information along the microtubule track. A failed delivery can cause severe damage to the cell’s functionality and lead to neurological diseases. Despite dynein’s rich history in cellular research, the mechanism of...
Resource Type:: Undergraduate Thesis

Simulating Synchrotron Optical Flashes in the Reverse Shock of a Gamma Ray Burst

Creator:: Bice, Connor
Abstract:: We construct a Monte Carlo simulation in Python to calculate optical flashes at 5x10¹⁴ Hz peaking at 6x10³¹ erg s⁻¹Hz⁻¹St⁻¹ due to synchrotron radiation from the reverse shock of a gamma-ray burst’s jet. While analytical solutions to this problem exist, they rely on sweeping simplifications of what is necessarily a...
Resource Type:: Undergraduate Thesis

Simulating Fluids: Testing a New Grand Canonical Histogram Method on the Square-Well Fluid

Creator:: Vande Griend, Jacob W.
Abstract:: Monte Carlo methods are used to explore vapor-liquid phase transitions. However, current models are computationally expensive when identifying these phase transitions. Traditionally, Monte Carlo simulations are run across a range of temperatures at a fixed number of atoms/molecules. The Number Monte Carlo method (NMC), our proposed Monte Carlo method, runs...
Resource Type:: Undergraduate Thesis

Simulating dynein’s powerstroke using Brownian dynamics

Creator:: Capek, Elliott L.
Abstract:: Dynein is a motor protein which transports cargo along tracks inside the cell. Like related motor proteins kinesin and myosin, dynein uses cellular energy to take steps with its two foot domains. Unlike kinesin or myosin, dynein’s stepping pattern is highly varied: it can take steps between zero and 60nm...
Resource Type:: Undergraduate Thesis

Simulating dynein’s powerstroke using Brownian dynamics

Creator:: Capek, Elliott
Abstract:: Dynein is a motor protein which transports cargo along tracks inside the cell. Like related motor proteins kinesin and myosin, dynein uses cellular energy to take steps with its two foot domains. Unlike kinesin or myosin, dynein’s stepping pattern is highly varied: it can take steps between zero and 60nm...
Resource Type:: Undergraduate Thesis

Scattering Mechanisms and Transport Properties of Semiconductors at Low Temperatures

Creator:: Kakepoto, Rohal
Abstract:: The purpose of this project is to verify scattering mechanisms in semiconductors by measuring transport properties and producing data that reflects existing research. The Hall effect is utilized to measure the resistivity, mobility and charge carrier concentration of the semiconductors: indium tin oxide (ITO), p-type silicon, and n-type silicon. By...
Resource Type:: Undergraduate Thesis

Riesz Transforms on a Sphere

Creator:: Tyma, Troy
Abstract:: Motivated by the Navier-Stokes equations, which are a set of unsolved equations related to fluid motion in R^3, we explored the incompressibility condition and the Neumann boundary problem. After exploring, we noticed that using iterated Riesz transforms of the boundary data could be used to get information about the velocity...
Resource Type:: Undergraduate Thesis

Repair of a Scanning Tunneling Microscope and Retesting for the Formation of Pyramidal Structures Formed on Sputtered Germanium (110)

Creator:: Betz, Hazel R.
Abstract:: Semiconducting materials are of immense importance due to their presence in almost all modern devices. It is possible that the surface physics of semiconductors could be used to control the nanoscale topography and properties of these materials, ultimately creating new options for device fabrication. This could result in profound implications...
Resource Type:: Undergraduate Thesis
Date Created:

Radio Telescope Resonator Design for Observation of the 21 cm Line

Creator:: Atkins, M. C.
Abstract:: Radio astronomy allows observations of unique objects and phenomena relating to the electric and magnetic fields of celestial objects. Radio astronomy can be preformed at any time of day and is less beholden to atmospheric conditions than optical astronomy. A radio telescope designed to receive radiation at 1.421 GHz, the...
Resource Type:: Undergraduate Thesis

Quantifying the Effects of Acoustic Coupling on Advanced LIGO

Creator:: Banowetz, Katherine
Abstract:: The Laser Gravitational Wave Observatory, or LIGO, is built to observe gravitational waves as they propagate through space. Advanced LIGO is extremely sensitive to movements of the test mass as small as 10⁻²¹ m/√Hz , which allows many signals other than gravitational waves to be detected by the system. Pressure...
Resource Type:: Undergraduate Thesis

Projected temperature and precipitation changes for Corvallis and Los Angeles for the 2030-2059 period using the Hadley Center's regional climate model (HadRM3P).

Creator:: Cheema, Karandeep Singh
Abstract:: Average monthly temperatures (maximum and minimum) and precipitation patterns are expected to change as a direct consequence of anthropogenic climate change. Temperatures are expected to be warmer in the future but precise estimates vary depending on factors like number of ensembles and emission scenario. For this study, we used 100...
Resource Type:: Undergraduate Thesis

Project BoxSand : Impact of Online Course Material and Mastering Physics Interactions on Exam Performance in a Flipped Classroom Environment

Creator:: Bigelow, Jake J.
Abstract:: A flipped classroom provides students with course content in the form of videos, readings, and/or simulations that they complete during the time traditionally used for homework assignments while in-class time is devoted to hands-on group learning activities. Project BoxSand is gathering quantitative data on how students in a flipped classroom,...
Resource Type:: Undergraduate Thesis

Predicting the Percentage: Relating the Refractive Index to Effective Medium Theory in Combination Dielectric Films

Creator:: Farmer, Skylar
Abstract:: Transparent conductive oxides (TCO) are at the forefront of technology with their uses in touch screen phones and televisions, solar cells and more. Titanium dioxide and tin dioxide are two TCOs that have been studied in depth on their own, so to further explore these TCOs, this project focuses on...
Resource Type:: Undergraduate Thesis

Practical Mechanically Interlocked Molecules: A Model of Gas Adsorption in Metal OrganicFrameworks Harboring Rotaxane Molecular Shuttles

Creator:: Carney, Jonathan
Abstract:: Metal organic frameworks(MOFs) are a class of crystalline materials utilized in gas storage, chemicalsensing, and other engineering applications. Recently chemists have begun synthesizing MOFs withmoving parts in order to further these applications. A wide array of dynamic MOFs have been created andtheorized. Among them is the interlocking of a ring...
Resource Type:: Undergraduate Thesis

Polarization Dependent Spectral Analysis Reveals Dipole Alignment and Intermolecular Coupling in Anthradithiophene Organic Semiconducting Crystals

Creator:: Lam, Andrew
Abstract:: Organic photovoltaics are being explored as the next generation material for semiconducting and optoelectronic devices but are limited by their stability and efficiency. One new candidate is crystallized Anthradithiophene (ADT), which is a promising photo-voltaic material due to its high quantum yield and adjustable side groups. The side derivatives TES-F,...
Resource Type:: Undergraduate Thesis

Plasmon Induced Transparency in Terahertz Metamaterials

Creator:: Meyers, Joseph
Abstract:: Plasmon induced transparency (PIT) describes a spectral response of coupled plasmonic resonators in that coupling between bright and dark modes leads to a destructive interference resulting in a narrow transparency window. This process has many applications in material characterization and advanced optical devices such as slow light devices or ultrafast...
Resource Type:: Undergraduate Thesis

Photodimerization of Organic Semiconductors in the Strong Coupling Regime

Creator:: Puro, Richard
Abstract:: Organic semiconducting materials have emerged in the last few decades as viable alternatives to inorganics in broad applications from field effect transistors to LEDs to solar cells. Organics provide many benefits over inorganics such as flexibility, sustainability, and reduced cost. However, these materials are more susceptible to degradation in the...
Resource Type:: Undergraduate Thesis

Organic Semiconductors : Incorporating Xylindein into (Opto)Electronic Devices

Creator:: Rath, Jeremy J.
Abstract:: This research investigates the electronic properties of a fungi-derived pigment, xylindein as a novel sustainable material for organic electronics. Xylindein molecules were characterized in solution and in film. Absorption spectra and (photo)luminescence spectra were taken at various excitation wavelengths. Xylindein’s molecular properties were computed with the Gaussian 09 software suite....
Resource Type:: Undergraduate Thesis

Optoelectronic Properties of a Novel Fungi-derived Pigment

Creator:: Wiesner, Cameron
Abstract:: In industry, there is considerable interest in finding sustainable, renewable materials for use in electronic devices. Pigments derived from spalting fungi are of particular interest due to their longevity in diverse environmental conditions. The focus of my project was to characterizethe properties of a novel, fungi-derived pigment, and to discover...
Resource Type:: Undergraduate Thesis

Optical Tweezer Trapping of Colloidal Polystyrene and Silica Microspheres

Creator:: Peters, Kyle C.
Abstract:: Optical trapping is a tool used throughout a wide variety of disciplines rang- ing from precisely probing and manipulating sub-micron organisms in biol- ogy to analyzing fundamental charge transfer in colloidal physics. This thesis presents research involving optical tweezer force measurements of polystyrene and silica microspheres. In addition, preliminary work...
Resource Type:: Undergraduate Thesis

Optical Modelling of Thin Films: Applying Effective Medium Theory to Mixtures of TiO₂ and SnO₂

Creator:: Wulf, Julian J.
Abstract:: This study used SCOUT optical modelling software to create models of the reflectance and transmittance spectra generated by mixtures of titanium dioxide (TiO2) and tin oxide (SnO2). These models enabled identification of how altering the ratio of a mixture changes the optical response. By being able to identify how altering...
Resource Type:: Undergraduate Thesis

Optical Analysis of Titania : Band Gaps of Brookite, Rutile and Anatase

Creator:: Lance, Ryan A.
Abstract:: The optical transition in high-fraction polymorphs of titania (TiO2) were investigated to determine the band gap behavior of the most common polymorphs—brookite, rutile, and anatase—the values of which are varied in the literature. The direct optical band gaps of brookite, rutile, and anatase, were determined to be 3.37(7)eV, 3.41(11)eV and...
Resource Type:: Undergraduate Thesis

Observation of the third harmonic sinusoidal voltage response of a small incandescent lightbulb

Creator:: Hutchings, Scott
Abstract:: This thesis looks at the third harmonic voltage response of a small incandescent lightbulb. The third harmonic voltage, or 3 omega (3ω) voltage, arises from applying a 1ω sinusoidal voltage across a resistive material. The 3ω voltage carries with it information about the thermal conductivity of the material. A lock-in-amplifier...
Resource Type:: Presentation and Undergraduate Thesis

Nucleation of Iron Dust From Type II Supernovae

Creator:: Fletcher, Lisa
Abstract:: When a star dies in a supernova, its constituent particles are torn apart and a gaseous cloud of atoms remains. These atoms may eventually condense again into large bodies such as planets and stars. There are three main theories as to how this happens: classical, kinetic, and non-local thermodynamic equilibrium...
Resource Type:: Undergraduate Thesis

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