Digital Commons Network^™

Birkhoff Summation Of Irrational Rotation: A Surprising Result For The Golden Mean, Heather L. Moore

Student Research Symposium

This research lies at the intersection of number theory and dynamical systems. We study the statistics of constant rotations by irrational numbers and investigate the relations between those statistics and the continued fraction approximates of a given irrational number.

This poster, which accompanies a written thesis, presents a surprising result that the difference in a certain sums of constant rotations by the golden mean approaches exactly 1/5. Specifically, we focus on the Birkhoff sums of these rotations, with the number of terms equal to squared Fibonacci numbers. The proof relies on the properties of continued fraction approximants, Vajda's identity and …

Differences In Ninth Graders’ Attitudes Towards Math Depending On Immigrant-Generation Status, Karla V. Santana Martinez, Dara Shifrer

Student Research Symposium

Introduction

Math is a subject that is often perceived as challenging and sometimes referred to as a universal language because the symbols and organization are the same from country to country. However, immigrant students can face obstacles such as language barriers that can make math even more challenging regardless of the universal language belief.

Methods

This research integrates the data from the High School Longitudinal Study of 2009 on 20,000 ninth graders. The ninth graders were asked questions about math and their feelings on the subject.

Results

Among students with the highest scores on the standardized math test, the math …

Construction And Mutagenesis Of Ssv1 Mutants In Extreme Viruses, Lou Ann F. O'Connor, Jono Abshier, Kenneth M. Stedman

Student Research Symposium

Archaeal viruses with unique structures such as spindle-shaped virions are found abundantly in extreme environments like geothermal hot springs around the world. Among all spindle-shaped viruses, the model Sulfolobus Spindle-shaped Virus 1 (SSV1) is best studied. Creating the lemon-shaped or spindle-shaped virion structure are two proteins, VP1 as the major capsid protein, and VP3 as the minor capsid protein. The primary structure of VP1 consists of a proteolytic cleavage site at position 66 that is believed to be necessary for virus evolution. Recent studies showed that genetic mutation of the amino acid, glutamate (E) at position 66 in VP1 which …

Neutron Time Of Flight Spectrometry As A Diagnostic Tool For Inertial Electrostatic Confinement Fusion Plasmas, Andrew H. Dempsey, Erik J. Sanchez

Student Research Symposium

Inertial electrostatic confinement (IEC) is a method for achieving fusion of light nuclei wherein ions are injected into a spherically symmetric system of concentric electrodes. When the innermost electrode is held at negative high voltage with respect to the outer electrode, ions injected into the reactor at cathode (ground) potential accelerate toward the anode where they may undergo collisions with sufficient energy to overcome Coulomb repulsion and achieve nuclear fusion. The most commonly used IEC fusion fuels are deuterium-deuterium (D-D) and deuterium-tritium (D-T). Both fuels undergo fusion reactions that result in production of fast neutrons with distinct energies. Neutron production …

Development Of A Fast-Neutron Source Localization System, Abdulsalam F. Al Mutairi

Student Research Symposium

Power generation by nuclear fusion is a continuing ambition that has been the focus of nuclear fusion research for nearly a hundred years. However, small-scale fusion reactors have further propulsion and neutron imaging applications that don’t require greater than breakeven efficiencies that a fusion energy source needs. Inertial Electrostatic Confinement (IEC) fusion devices have the potential for miniaturization, making them a strong candidate for such applications. Yet the contributions of different interactions within an IEC fusion device are still not fully understood. Imaging an IEC device and investigating each interaction's Neutron Production Rate (NPR) can enhance design efficiency. Neutron imaging …

Phytoplankton Community Dynamics In The Northern California Current System, Kristin Forgrave

Student Research Symposium

The Northern California Current system is a productive coastal ecosystem that encompasses a variety of temporal and spatial features. The photosynthetic microbial community plays a crucial role in supporting the rich ecosystem and economically important fisheries. My research integrates data across distance and two years to investigate the community composition of two major phytoplankton groups in this system: picocyanobacteria and picoeukaryotes. The abundances and sizes of the phytoplankton were measured using flow cytometry. Picoeukaryotes were found to be present at similar concentrations in both summer and winter. Abundances of both cell types were comparable in the winter, but picocyanobacteria were …

Power & Planning: A Critical Comparison Of Tribal And Non-Tribal Wildfire Protection Plans, Christian J. Heisler

Student Research Symposium

In 2003, the US government passed the Healthy Forest Restoration Act, which urged wildfire-prone communities to develop Community Wildfire Protection Plans (CWPPs). These plans allow local groups to contextualize risk, practice social learning, and develop social capital while addressing wildfire risk. Within planning realms, however, decision-making power is usually concentrated unequally between social groups which can limit the influence of marginalized communities. Tribal nations, specifically, have been excluded from wildfire planning since European contact, signaling that CWPPs may not reflect Indigenous worldviews and priorities. Given the recent push from the federal government to increase land management collaboration with tribes, it …

Behavioral Intention For Ai Usage In Higher Education, Isaac A. Odai, Elliot Wiley

Student Research Symposium

This study sought to further understand the cognitive factors that influence undergraduate students' behavioral intention to use generative AI. Generative AI's presence in academic spaces opens the door for ethical and pedagogical questions. This study surveyed 51 undergraduate communication students to measure their attitudes, subjective norms, self efficacy and their behavioral intention to use GenAI for school work. The results of this study showed behavioral intent had a positive relationship with attitudes and subjective norms. The implications of these findings show that personal beliefs and the perceived beliefs of others are correlated to undergraduate students’ intent to use GenAI for …

Systematic Comparison Of Propensity Score Matching And Structural Causal Modeling For Clinical Applications, With A Case Study Of Albumin Treatment For Acute Kidney Injury (Aki) Patients: Propensity Score Matching Vs. Structural Causal Models, Layaal Khellah

Student Research Symposium

Introduction:

Propensity Score Matching (PSM) and Structural Causal Models (SCMs) are key approaches in causal inference for treatment evaluation and clinical decisions, both rooted in the potential outcome framework but differing in their foundations—PSM follows Rubin's Causal Model, while SCMs adhere to the Structural Theory of Causation.

Methods:

Our study compares PSM and SCMs in clinical contexts, focusing on albumin as an AKI treatment. We examine each method's steps, highlighting differences. Using data from AKI patients with cirrhosis, we assess albumin’s treatment efficacy with both PSM and SCMs, offering insights into their performance in estimating causal effects..

Results:

PSM and …

Considering The Historical And Systemic Context, To What Extent Are Cuban Women’S Healthcare And Reproductive Rights Affected By The Privacy And Social Influence Of Cuba Today?, Autumn Cowell

Student Research Symposium

This paper will examine how historical and systemic values continue to frame social influences thus impacting Cuban women’s healthcare and reproductive rights. If the impact of history and systems still affects social influences then Women’s Healthcare and Reproductive Rights may be compromised. This investigation will highlight the potential benefits and risks of historical and systemic values that have affected challenges or changes within Cuban culture. And how these social influences are found within the areas of prevention, intervention, and treatment. This paper hopes to outline how the Cuban government and society are sustaining the protection of Cuban women’s access to …

Understanding The Importance Of Social Emotional Learning In Children And The Link Between Mental Health, Lynette Marie Lubiak

Student Research Symposium

I will examine how very important it is to society to teach structured Social Emotional Learning (SEL) programs to children in school. It can bring mental wellbeing and the ability to have healthy relationships, non addictive behaviors and being able to emotionally regulate themselves. Since we have pushed on only academia and not SEL for our children, mental illness has skyrocketed. This problem started after the SEL part of school was taken out of schools and then the division between rich and poor became wider and wider as time went on. If we were to bring back SEL into school, …

A Hierarchical Decision Model For Evaluating The Strategy Readiness Of Quantitative Machine Learning/Data Science-Driven Investment Strategies, Mohammadsaleh Saadatmand

Dissertations and Theses

Big data and computational technologies are increasingly important worldwide in asset and investment management. Many investment management firms are adopting these data science methods and technologies to improve performance across all investment processes. Researchers actively use these methods to develop more effective systematic investment strategies and produce more reliable outcomes less vulnerable to human decision-making biases. However, the success of such a strategy depends heavily on the scientific rigor applied throughout the process. "Best practices involve understanding how to make better decisions in the research design process. A good question is whether we can make better decisions in developing quantitative …

Faculty Senate Monthly Packet May 2024, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The May 6, 2024 monthly packet includes the May agenda, appendices, and the Faculty Senate minutes and attachments from the meeting held May 6, 2024.

Static Reflective Surfaces For Improved Terahertz Coverage, Thanh Le, Suresh Singh

Computer Science Faculty Publications and Presentations

LoS (Line of Sight) MIMO (Multiple Input Multiple Output) is considered the best way to deliver high capacity channels for terahertz communications due to the severe attenuation suffered by reflected components. Unfortunately, terahertz links are easily blocked by any obstruction resulting in link breakage. Therefore, it is necessary to provide alternative paths via reflectors. A problem shared by LoS paths and reflected paths (via polished reflectors) is that the channel matrix is rank 1 in the far-field. As a result, the achieved capacity is lower than what can theoretically be achieved in a rich multi-path environment. In this work, we …

The Cambridge Five Spy Ring: The Notorious Bane Of The British Government, Jenna G. Mccomas

Young Historians Conference

Beginning with the communist recruitment of Kim Philby in 1934, this paper traces the decades-long espionage journey of the notorious Cambridge Five spy ring. Exploring the reach they had from the halls of the British government to Washington D.C, this paper highlights the building blocks of the Five’s legacy and their implications. This paper details the levels of and effects of British governmental incompetence in cementing the Five as international spy celebrities and enabling their Soviet espionage endeavors. Overall, it seeks to explore how the British were the agents of their own humiliation regarding espionage, and unnecessarily increased tension with …

Identity In Question: Middle Eastern Americans In Dearborn, Michigan, Julian F. Balsley

Young Historians Conference

In the 2020 United States Census, fifty-four percent of the population of Dearborn, Michigan, identified as being of Middle Eastern or North African descent. The story of how a small Detroit suburb became the American city with the largest proportion of Middle Eastern citizens is one of transnational relations between the U.S., its ally Israel, and the Middle East. The city’s Arab American community grew out of continuous wars that pushed people out of their homelands throughout the second half of the twentieth century, as well as the rise of the American auto industry. What makes Dearborn unique is that …

A History Of The Bracero Program As An Agent Of Transnational Modernity In The 20th Century, Lea H. Yonago

Young Historians Conference

The Bracero Program was an agreement devised between Mexico and the United States which provided a state-sanctioned avenue for Mexican men to work as contract laborers in the United States. It was originally intended to alleviate the World War II labor shortage in the United States, but would continue past the war until 1964. Its longevity was due to the central role it played in bringing Mexico and the United States into a modern, transnational relationship. I aim to examine the relationship between the two nations in two contexts: an historical-economic one, and an ethnographic one. These lenses are two …

An Adaptive Large Neighborhood Search For The Multi-Vehicle Profitable Tour Problem With Flexible Compartments And Mandatory Customers, Vincent F. Yu, Nabila Yuraisyah Salsabila, Aldy Gunawan, Anggun Nurfitriani Handoko

Civil and Environmental Engineering Faculty Publications and Presentations

The home-refill delivery system is a business model that addresses the concerns of plastic waste and its impact on the environment. It allows customers to pick up their household goods at their doorsteps and refill them into their own containers. However, the difficulty in accessing customers’ locations and product consolidations are undeniable challenges. To overcome these issues, we introduce a new variant of the Profitable Tour Problem, named the multi-vehicle profitable tour problem with flexible compartments and mandatory customers (MVPTPFC-MC). The objective is to maximize the difference between the total collected profit and the traveling cost. We model the proposed …

Trust Model Measurements For The Energy Grid Of Things, N. Sonali Fernando, John M. Acken, Robert Bass

Electrical and Computer Engineering Faculty Publications and Presentations

Information security is essential for the reliable operation of an Energy Grid of Things (EGoT). In addition to basic information security protocols as defined by published standards, there is a need for a monitoring function that measures the trustworthiness of the various actors participating in an EGoT. We describe in this paper the implementation and evaluation of a Distributed Trust Model that was developed specifically for monitoring communication within an EGoT. We then show how the model parameters are set using statistical measures for hypothesis testing.

Does Assisted Living Provide Assistance And Promote Living?, Sheryl Zimmerman, Robyn Stone, Paula Carder, Kali Thomas

Institute on Aging Publications

Assisted living has promised assistance and quality of living to older adults for more than eighty years. It is the largest residential provider of long-term care in the United States, serving more than 918,000 older adults as of 2018. As assisted living has evolved, the needs of residents have become more challenging; staffing shortages have worsened; regulations have become complex; the need for consumer support, education, and advocacy has grown; and financing and accessibility have become insufficient. Together, these factors have limited the extent to which today's assisted living adequately provides assistance and promotes living, with negative consequences for aging …

Learning To Teach About Climate Justice And Social Justice In Science Methods, Mindy J. Chappell

Northwest Journal of Teacher Education

In November, the Editors of NWJTE sat down for a conversation with Dr. Mindy J. Chappell, a Science Teacher Educator in the College of Education at Portland State University. Dr. Chappell’s passions include developing teachers who are prepared to disrupt normative science ideologies and provide young people with science instruction that encourages and empowers them to be leaders in their communities. She engages in arts-based educational science research through the methodology of Ethnodance (a term she coined). She places young people and their lived experiences at the heart of her work.

Addressing Climate Change Anomie In Teacher Education, Teresa Anne Fowler

Northwest Journal of Teacher Education

This research project sought to understand how preservice teachers explore their relationship with Science and confidence in teaching about climate change in Science education amid a culture of denial regarding the impact of the climate crisis. Using data from three cohorts of students in an elementary Science methods course, this paper shares the context of climate change acceptance in the province of Alberta, Canada, the fossil fuel economic hub of Canada, and how using Journell’s framework for controversial issues alongside a critical energy literacy framework using inquiry, supported preservice teachers to address their hesitancy in Science classrooms to engage with …

Preservice Teachers Learning To Teach In An Anti-Racist/Climate-Justice Program: Challenges And Promises, Richard Sawyer

Northwest Journal of Teacher Education

The global climate crisis represents the most urgent problem facing the planet, impacting social, cultural, political, economic, and environmental dimensions of life. Alarmingly, it has impacted communities of color in disproportionate ways (Goddell, 2023; Pellow, 2013). The climate crisis, along with the intertwined context of racism, places a profound responsibility on social justice teacher educators to prioritize addressing these issues in teacher preparation. The intent of the following two case studies is to explore the impact of a project based teacher preparation program focused on cultural and environmental justice on the pedagogical knowledge and practice of teaching interns at the …

Electron-Phonon Interaction Mediated Gigantic Enhancement Of Thermoelectric Power Factor Induced By Topological Phase Transition., Zhi Li, Koushik Pal, Huiju Lee, Chris Wolverton, Yi Xia

Mechanical and Materials Engineering Faculty Publications and Presentations

We propose an effective strategy to significantly enhance the thermoelectric power factor (PF) of a series of 2D semimetals and semiconductors by driving them toward a topological phase transition (TPT). Employing first-principles calculations with an explicit consideration of electron-phonon interactions, we analyze the electronic transport properties of germanene across the TPT by applying hydrogenation and biaxial strain. We reveal that the nontrivial semimetal phase, hydrogenated germanene with 8% biaxial strain, achieves a considerable 4-fold PF enhancement, attributed to the highly asymmetric electronic structure and semimetallic nature of the nontrivial phase. We extend the strategy to another two representative 2D materials …

Spatiotemporal Analysis Of Soil Quality Degradation And Emissions In The State Of Iowa (Usa), Elena A. Mikhailova, Hamdi A. Zurqani, Lili Lin, Zhenbang Hao, Christopher J. Post, Mark A. Schlautman, Gregory C. Post

Geography Faculty Publications and Presentations

The concept of soil quality (SQ) is defined as the soil's capacity to function, which is commonly assessed at the field scale. Soil quality is composed of inherent (soil suitability) and dynamic (soil health, SH) SQ, which can also be analyzed using geospatial tools as a SQ continuum (SQC). This study proposes an innovative spatiotemporal analysis of SQ degradation and emissions from land developments using the state of Iowa (IA) in the United States of America (USA) as a case study. The SQ degradation was linked to anthropogenic soil (SD) and land degradation (LD) in the state. More than 88% …

Chemical And Physiological Interactions Between E-Liquid Constituents: Cause For Concern?, Robert M. Strongin, Eva Sharma, Hanno C. Erythropel, Nada O F Kassem, Alexandra Noël, D H. Peyton, Irfan Rahman

Chemistry Faculty Publications and Presentations

Studies of Electronic Nicotine Delivery Systems (ENDS) toxicity have largely focused on individual components such as flavour additives, base e-liquid ingredients (propylene glycol, glycerol), device characteristics (eg, model, components, wattage), use behaviour, etc. However, vaping involves inhalation of chemical mixtures and interactions between compounds can occur that can lead to different toxicities than toxicity of the individual components. Methods based on the additive toxicity of individual chemical components to estimate the health risks of complex mixtures can result in the overestimation or underestimation of exposure risks, since interactions between components are under-investigated. In the case of ENDS, the potential of …

Eco-Efficient Coatings For Healthy Indoors: Ozone Deposition Velocities, Primary And Secondary Emissions, Alessandra Ranesi, Paulina Faria, M. Rosario Veiga, Elliott T. Gall

Mechanical and Materials Engineering Faculty Publications and Presentations

Volatile organic compounds (VOCs) and ozone (O3) are harmful pollutants present in indoor air. Indoor concentrations of VOCs are typically higher than outdoors, due to the presence of indoor sources like building materials and ozone-surface reactions. The study aims to identify and quantify the ozone reactivity and primary and secondary emissions of different indoor coatings. The coatings selected for the study were three gypsum-based plastering mortar, with and without the addition of a bio-waste from Acacia dealbata (raw bark, BA, and bark heated at 250°C, BA250), two clay plasters (one with sand and the other with seashells as additional aggregate), …

Quantum Search Algorithms For Constraint Satisfaction And Optimization Problems Using Grover's Search And Quantum Walk Algorithms With Advanced Oracle Design, Abdirahman Sheikh Hassan Alasow

Dissertations and Theses

The field of quantum computing has emerged as a powerful tool for solving and optimizing combinatorial optimization problems. To solve many real-world problems with many variables and possible solutions for constraint satisfaction and optimization problems, the required number of qubits of scalable hardware for quantum computing is the bottleneck in the current generation of quantum computers. In this dissertation, we will demonstrate advanced, scalable building blocks for the quantum search algorithms that have been implemented in Grover's search algorithm and the quantum walk algorithm. The scalable building blocks are used to reduce the required number of qubits in the design. …

Adaptive Sampling For Seabed Identification From Ambient Acoustic Noise, Matthew Sullivan

Dissertations and Theses

This thesis discusses distinguishing geoacoustic properties of seabeds by adaptively sampling ambient acoustic measurements using an autonomous underwater vehicle. Modern advancements in seabed characterization motivate an online method for distinguishing between two seabed types using Fourier transformed ambient acoustic noise snapshots. These snapshots are assumed to be associated with their spatial location and seabed, making the goal to organize unlabeled seabed locations. The snapshots are transformed to obtain pairwise similarities between locations. Locations with similarities exceeding a threshold are classified together with the goal of identifying all locations with similarities below this threshold using a process known as level set …

Meso-Scale Seabed Quantification With Geoacoustic Inversion, Tim Sonnemann, Jan Dettmer, Charles W. Holland, Stan E. Dosso

Electrical and Computer Engineering Faculty Publications and Presentations

Abstract Knowledge of sub-seabed geoacoustic properties, for example depth dependent sound speed and porosity, is of importance for a variety of applications. Here, we present a semi-automated geoacoustic inversion method for autonomous underwater vehicle data that objectively adapts model inference to seabed structure. Through parallelized trans-dimensional Bayesian inference, we infer seabed properties along a 12 km survey track on the scale of about 10 cm and 50 m in the vertical and horizontal, respectively. The inferred seabed properties include sound speed, attenuation, density, and porosity as a function of depth from acoustic reflection coefficient data. Parameter uncertainties are quantified, and …