Digital Commons Network^™

Are Countries In Environmental Cooperation Concerned About Relative Gains?, Vivian Chinua Olivia Ike

Master's Theses

A country’s decision to join or withdraw from environmental cooperation has been argued by interest based theories to be influenced by the economic cost of international agreements, national interest of countries and the free-rider problem. However, this thesis argues that relative gains is a more decisive factor that influences the decision of countries in international arrangements. It hypothesizes that countries in environmental cooperation are concerned about relative gains. A content analysis of the statements of fifteen countries in international climate change cooperation are analyzed. The countries include the United States, Russian Federation, Canada, Japan, Australia, China, Brazil, South Africa, India, …

Effects Of Prebiotics On Gut Bacterial Communities And Healing Of Induced Colitis In Mice, Krystyn Elizabeth Davis

Master's Theses

Inflammatory Bowel Diseases (IBD) cause chronic inflammation of the gastrointestinal tract and debilitating symptoms in those suffering from the diseases. After inducing colitis in a mouse model using Dextran Sulfate Sodium (DSS), prebiotics inulin and oligofructose enriched inulin (OEI) were used as treatments to determine their effects on the gut microbial community, physiological healing process, and immune response in the mice after initial inflammation and before subsequent inflammation, or relapse. The treatment with inulin led to an increase in regulatory T cell number, but this increase was not as significant as the increase induced by the OEI. Inulin increased the …

Krylov Subspace Spectral Method With Multigrid For A Time-Dependent, Variable-Coefficient Partial Differential Equation, Haley Renee Dozier

Master's Theses

Krylov Subspace Spectral (KSS) methods are traditionally used to solve time-dependent, variable-coefficient PDEs. They are high-order accurate, component-wise methods that are efficient with variable input sizes.

This thesis will demonstrate how one can make KSS methods even more efficient by using a Multigrid-like approach for low-frequency components. The essential ingredients of Multigrid, such as restriction, residual correction, and prolongation, are adapted to the timedependent case. Then a comparison of KSS, KSS with Multigrid, KSS-EPI and standard Krylov projection methods will be demonstrated.

The Effects Of Nicotine On Conditioning, Extinction, And Reinstatement In Humans Using A Virtual Reality Conditioned Place Preference Paradigm, Alexandra N. Palmisano

Master's Theses

Despite an abundance of evidence illustrating the harmful effects of nicotine use, only a small percentage of users successfully quit (Messer et al., 2008). Moreover, current treatments for nicotine cessation produce only a slight increase in the likelihood of successfully quitting, which emphasizes the need for more effective strategies that facilitate smoking cessation (Hopkins et al., 2001). Several studies suggest that difficulty in controlling nicotine use behaviors results from nicotine’s ability to enhance the motivating function of cues associated with obtaining rewards. These studies indicate that it is of value to understand the behavioral and neuropharmacological mechanisms by which nicotine …

Information Processing In The Hippocampus And The Medial Prefrontal Cortex During Hippocampal Dependent And Independent Task: An Lfp Analysis, Jinah Yoon 4863671

Master's Theses

No abstract provided.

Location Inference Of Social Media Posts At Hyper-Local Scale, Brian D. Mcclanahan

Master's Theses

This paper describes an approach to infer the location of a social media post at a hyper-local scale based on its content, conditional to the knowledge that the post originates from a larger area such as a city or even a state. The approach comprises three components: (i) a discriminative classifier, namely, Logistic Regression (LR) which selects from a set of most probable sub-regions from where 1 a post might have originated; (ii) a clustering technique, namely, k-means, that adaptively partitions the larger geographic region into sub-regions based on the density of the posts; and (iii) a range of techniques …

The Influence Of The Quality Of Radiographs And Training On The Reproducibility Of The Cervical Vertebrae Maturation Method, Anfal Khajah

Master's Theses

No abstract provided.

A Minor Necessity: Minor Splicing Is Required In Murine Limb Development, Christopher D. Lemoine

Master's Theses

Microcephalic osteodysplastic primordial dwarfism type-1 (MODI) is a rare congenital developmental disorder resulting in patients presenting with microcephaly, limb abnormalities, and growth retardation. This disease, along with the related Roifman Syndrome, results from mutations to the gene RNU4atac. This gene encodes for the U4atac small nuclear RNA (snRNA) which, along with four other snRNAs (U11, U12, U5, and U6atac) compose the small nuclear ribonucleoprotein (snRNP) complex called the minor spliceosome. Responsible for the excision of a subpopulation of introns (called minor introns), the minor spliceosome is known to play an essential role in eukaryotic limb development. However, while mutations in …

Whisk: Web Hosted Information Into Summarized Knowledge, Jiewen Wu

Master's Theses

Today’s online content increases at an alarmingly rate which exceeds users’ ability to consume such content. Modern search techniques allow users to enter keyword queries to find content they wish to see. However, such techniques break down when users freely browse the internet without knowing exactly what they want. Users may have to invest an unnecessarily long time reading content to see if they are interested in it. Automatic text summarization helps relieve this problem by creating synopses that significantly reduce the text while preserving the key points. Steffen Lyngbaek created the SPORK summarization pipeline to solve the content overload …

Influence Of Teeth Preparation And Obturation Material On Endodontically Treated Teeth, Yousef Redhai

Master's Theses

No abstract provided.

The Interrelations Between Work Factors, Family And Work Health Climate, Work Schedule, And Individual Behaviors, Jennifer C. Buden

Master's Theses

Background: The rates of obesity in the United States continue to rise, particularly with disparities in high stress, low job control occupations such as corrections. Employers are in a unique position to improve employee health through development of Total Worker Health interventions that integrate worker safety and health promotion to improve employee health and well-being.²⁵ Understanding influences on health behaviors in the workplace such as social support, and work schedules as well as family environment, may aide in developing worksite preventive strategies with the anticipation of chronic disease reduction and weight management. Purpose: The purpose of these studies was …

The Prevalence And Severity Of Incidental Temporomandibular Joint Osteoarthritic Changes In Implant Patients: A Cone Beam Ct Study, Adel Alzahrani

Master's Theses

No abstract provided.

Incivility As A Communication Barrier: The Effects Of Incivility Experiences, Appraisals, And Context On Employees’ Constructive Voice Behavior, Kerri C. Nelson

Master's Theses

In today’s competitive environment, organizations and researchers alike are placing increasing emphasis on the role of communication and, more specifically, employee voice at work. However, much less is known about workplace mistreatment as an antecedent factor that might hinder this important workplace asset. The current research examined a specific antecedent factor, workplace incivility, and its effects on constructive voice and engagement using a transactional stress theory framework. Currently, no research has investigated the potential for a connection between incivility and constructive voice, limiting our current understanding of their relationship. In an initial study, psychological safety and appraisals of control were …

Increased Delta As A Compensatory Strategy During Working Memory In High-Performing Patients With Schizophrenia, Faith Steffen-Allen

Master's Theses

Working memory (WM) impairment is a core cognitive deficit in schizophrenia and has been linked to dysfunction in the gamma, alpha, and theta bands. However, successful WM performance in high-performing patients is less well characterized. This study aims to investigate modulation of the EEG signal during successful WM performance in schizophrenia and to examine how that modulation differs from controls.

Patients with schizophrenia (n=7) and controls (n=9) had scalp EEG recorded during a modified Sternberg WM task with two difficulty levels. The task was subdivided into four stages (pre-trial baseline, encoding, retention, and probe). Task-induced amplitudes were computed for the …

The Effects Of Ion Substitution On Perovskite Film Degradation In Controlled Humidity Environments, Eric David Grulke

Master's Theses

The demand for clean, renewable energy grows constantly as time progresses and harvesting solar energy has been identified as one of the key pieces in solving this puzzle. Through ambipolar diffusion and high absorption characteristics, perovskite based solar cells have seen a large jump in device efficiency over a short amount of time. Perovskite cells are also appealing due to their low cost and ease of manufacturing, with the potential of competing with silicon based solar cells in the future. However, stability issues due to environmental factors, such as reactivity to atmospheric moisture, have plagued perovskites. These issues often lead …

The 2013 Boston Marathon Attacks: An Experimental Investigation Of Worldview Change Following Film Re-Exposure To Mass Trauma, Ian A. Gutierrez

Master's Theses

Models of meaning making and post-traumatic growth contend that traumatic events are catalysts for significant and long-lasting change in a person’s worldview—that is, their beliefs about social, metaphysical, theological, and political reality. Nearly all tests of this contention have employed retrospective and cross-sectional methods. However, the limitations inherent in these designs preclude causal conclusions. The current study represents the first longitudinal, laboratory-based experimental examination of belief change following trauma exposure using the trauma film paradigm. Findings reveal that the trauma film paradigm can successfully induce posttraumatic affective responses with live news coverage of a mass trauma (i.e., the 2013 Boston …

Subsystem Failure Analysis Within The Horizon Simulation Framework, Ian M. Lunsford

Master's Theses

System design is an inherently expensive and time consuming process. Engineers are constantly tasked to investigate new solutions for various programs. Model-based systems engineering (MBSE) is an up and coming successful method used to reduce the time spent during the design process. By utilizing simulations, model-based systems engineering can verify high-level system requirements quickly and at low cost early in the design process. The Horizon Simulation Framework, or HSF, provides the capability of simulating a system and verifying the system performance. This paper outlines an improvement to the Horizon Simulation Framework by providing information to the user regarding schedule failures …

Design And Testing Of A Novel Adhesion And Locomotion Method For Wall Climbing Vehicles, Jim R. Stefani

Master's Theses

The objective of this project was to design, construct and test a wall climbing vehicle which uses a novel vacuum tread system for both adhesion and locomotion. The design and manufacturing of this proof of concept vehicle is detailed with particular emphasis on the design decisions that proved most impactful to the performance of both the vehicle and the tread system. Adhesion performance was characterized by a series of tests that validate the concept, but also identify improvements and design recommendations for future embodiments of the adhesion/locomotion system.

Continuum Modeling Of The Densification Of W-Ni-Fe During Selective Laser Sintering, Connor M. West

Master's Theses

The purpose of this thesis is to effectively model the time history of the temperature distribution during the selective laser sintering process and use this information to investigate the resulting relative density. The temperature is a critical parameter of the process because it directly effects the overall quality of the part. First, an efficient, affordable, and reliable simulation was developed within the finite element software, Abaqus. Next, the results from the simulations were compared to the experimental results performed by Wang et al. (2016). The FEA model consisted of a 3 layer simulation. Multiple simulations at various laser recipes were …

Design Of Inexpensive And Easy To Use Diy Internet Of Things Platform, Samuel R. Jaffe

Master's Theses

This thesis focuses on the design and implementation of a new, inexpensive, and less complex system for a Do-It-Yourself (DIY) Internet of Things (IoT) platform. The hardware aspects focus on a new chip called the ESP8266 which contains both microcontroller and WiFi connectivity capabilities in an extremely affordable package. The system uses the Arduino IDE to program the ESP8266, which is known to be an extremely user-friendly environment. All other software is both free and easy to use. Past methods of creating IoT projects involved either expensive hardware, often ranging from $50-$100 per node, or complicated programming requiring a full …

Physical Testing Of Potential Football Helmet Design Enhancements, Michael Jeremy Schuster

Master's Theses

Football is a much loved sport in the United States. Unfortunately, it is also hard on the players and puts them at very high risk of concussion. To combat this an inventor in Santa Barbara brought a new design to Cal Poly to be tested.

The design was tested in small scale first in order to make some preliminary conclusions about the design. In order to fully test the helmet design; however, full scale testing was required. In order to carry out this testing a drop tower was built based on National Operating Committee on Standards for Athletic Equipment, NOCSAE, …

Processing Of Simulated And Experimental Images Of Closely Spaced Binary Stars Using Speckle Interferometry, Niels Smidth

Master's Theses

Theory and methods of processing speckle interferometry data from close visual binary stars are presented and implemented. The effects of the optical systems used for observing close visual binary stars are explained and simulated from both the geometrical and physical optical viewpoints. The atmospheric phase distortion and shot noise responsible for the observed speckle patterns are simulated. The deconvolution technique originally presented by Labeyrie is implemented to extract astrometric data from close visual binary stars. This method is applied to both simulated and experimental data from Kitt Peak National Observatory as validation. Parts of the deconvolution process are optimized to …

Assessment Of Micronutrient Status In Pregnant Malawian Women Before And After Treatment For Moderate Malnutrition, Cambria M. Glosz

Master's Theses

Background: Multiple micronutrient deficiencies are prevalent in pregnant women in developing countries and can result in adverse effects to both the mother and infant. Multiple micronutrient supplements or supplementary foods may be a way to combat micronutrient deficiencies.

Objective: To assess change in micronutrient and protein levels in moderately malnourished pregnant Malawian women after receiving one of three nutritional interventions.

Methods: Serum retinol, 25-hydroxyvitamin D, ferritin, vitamin B₁₂, folate, zinc, albumin and C-reactive protein concentrations were measured in pregnant women with MUAC >20.6 cm and

Results: Baseline micronutrient concentrations indicated high rates of deficiency …

Benefits Of Advanced Traffic Management Solutions: Before And After Crash Analysis For Deployment Of A Variable Advisory Speed Limit System, Alexander Lindsay Chambers

Master's Theses

Variable speed limit (VSL) systems are important active traffic management tools that are being deployed across the U.S. and indeed around the world for relieving congestion and improving safety. Oregon’s first variable advisory speed limit signs were activated along Oregon Highway 217 in the summer of 2014. The variable advisory speed system is responsive to both congestion and weather conditions. This seven-mile corridor stretches around Western Portland and has suffered from high crash rates and peak period congestion in the past. VSL systems are often deployed to address safety, mobility and sustainability related performance. This research seeks to determine whether …

Arc Fault Circuit Interrupter Development For Residential Dc Electricity, Cassidy Alan Aarstad

Master's Theses

The following technical report describes the development and testing of an arc fault circuit interrupter (AFCI) for DC circuits operating primarily at 48 volts. We have identified an effective method for determining when arcing is occurring. Our method is primarily based on comparing the frequency spectrum of current flowing through the circuit during an arcing event to a known characteristic spectrum. Once an arc has been identified, our interrupter is capable of responding adequately to eliminate the arc. Hardware tests show the AFCI developed in this thesis responded, in all test cases, within 2 seconds of an arc fault occurrence. …

Astro – A Low-Cost, Low-Power Cluster For Cpu-Gpu Hybrid Computing Using The Jetson Tk1, Sean Kai Sheen

Master's Theses

With the rising costs of large scale distributed systems many researchers have began looking at utilizing low power architectures for clusters. In this paper, we describe our Astro cluster, which consists of 46 NVIDIA Jetson TK1 nodes each equipped with an ARM Cortex A15 CPU, 192 core Kepler GPU, 2 GB of RAM, and 16 GB of flash storage. The cluster has a number of advantages when compared to conventional clusters including lower power usage, ambient cooling, shared memory between the CPU and GPU, and affordability. The cluster is built using commodity hardware and can be setup for relatively low …

The Effects Of Latency On 3d Interactive Data Visualizations, Allen Korenevsky

Master's Theses

Interactive data visualizations must respond fluidly to user input to be effective, or so we assume. In fact it is unknown exactly how fast a visualization must run to present every facet within a dataset. An engineering team with limited resources is left with intuition and estimates to determine if their application performs sufficiently well.

This thesis studies how latency affects users' comprehension of data visualizations, specifically 3D geospatial visualizations with large data sets. Subjects used a climate visualization showing temperatures spanning from the 19th to the 21st century to answer multiple choice questions. Metrics like their eye movements, time …

Concatenative Synthesis For Novel Timbral Creation, James Eric Bilous

Master's Theses

Modern day musicians rely on a variety of instruments for musical expression. Tones produced from electronic instruments have become almost as commonplace as those produced by traditional ones as evidenced by the plethora of artists who can be found composing and performing with nothing more than a personal computer. This desire to embrace technical innovation as a means to augment performance art has created a budding field in computer science that explores the creation and manipulation of sound for artistic purposes. One facet of this new frontier concerns timbral creation, or the development of new sounds with unique characteristics that …

Stress Ecology Of The Pacific Rattlesnakes (Crotalus Oreganus And Crotalus Helleri), Natalie Claunch

Master's Theses

Stress is a physiological state induced by disturbance or adverse environmental conditions and is modulated by the glucocorticoid hormone corticosterone (CORT) in reptiles. Stressors can have various impacts on vertebrate trait expression and may affect survival or reproduction. Little is known about the effects of chronically elevated CORT in free-ranging reptiles, or the effect of disturbance stress on venom composition in captive snakes.

In chapter 1, we investigated the effects of researcher induced disturbance on CORT levels and venom composition in a group of captive Northern Pacific rattlesnakes (Crotalus oreganus). Venom protein concentration and plasma CORT levels were …

Design Of An Integrated Acceleration Acquisition Subsystem To Satisfy High-Speed And Low-Area Requirements For Cubesats, Ryan J. Rumsey

Master's Theses

Cal Poly San Luis Obispo’s PolySat team is designing the Multipurpose Orbital Spring Ejection System (MOSES) in order to record acceleration data during the launch of CubeSats as well as to provide GPS coordinates to locate the position of CubeSats once they are injected into orbit. This work focuses on the design and development of the acceleration data acquisition (DAQ) subsystem of MOSES. This subsystem is designed around the need for a high-speed sampling system of at least 200 kHz across four channels of data, plus low-area limitations in the MOSES form factor which is roughly half the size of …