Digital Commons Network^™

Microwave Simulations Of A Beam Position Monitor And Circuit Designs Assisting Its Beam Testing, Marc Jacob Crowell

Graduate Research Theses & Dissertations

Beam position monitors (BPMs) are non-destructive diagnostic devices widely used in particle accelerators. I will first introduce the need for precision beam position measurement in particle accelerators, and then provide an overview of various types of BPMs. For the first part of my work, I focus on the design and simulation of a button-BPM. Microwave and wakefield simulations were performed to characterize the output signals. Such a design could find a potential application at the Argonne Wakefield Accelerator (AWA) at the Argonne National Laboratory. Although no BPMs have been fabricated to this date, a future beam experiment will be needed …

Theory Of Ultrafast Spin Crossover In Divalent Iron Systems, William Baker

Graduate Research Theses & Dissertations

A theory to account for the ultrafast, i.e. femtosecond timescale, singlet to quintet spin crossover in divalent iron molecules is developed. The model considers an iron cluster with ligands extending in all 6 cardinal directions initially at rest in a low spin singlet ground state. An optical excitation excites an electron from the d orbitals to the ligands, changing the system from the metal centered (MC) singlet state to the metal to ligand charge transfer (MLCT) singlet state. Experimentally, it is known that the system eventually relaxes into the quintet MC state, but there are no satisfactory explanations that model …

Civic Engagement & Health Outcomes: Poor And Black America, Robert Louis Durbin

Graduate Research Theses & Dissertations

This research explores the implications of state electoral climate on the health of vulnerable groups in America, especially that of Black and low-income Americans. This research uses the Cost of Voting Index (COVI), a measure of state laws related to voting, as a proxy for the potential for civic engagement. Specifically, I contend that a more restrictive state electoral climate hampers individuals’ potential for civic engagement, in turn increasing social isolation and reducing their exposure to useful health information. This reduced community education then contributes to worse health outcomes for individuals living in states with a more restrictive electoral climate. …

Design And Analysis Of Coupler Installation Tooling With Computer Vision For Fermilab’S Single Spoke Resonator 2 Srf Cavity, Caleb T. Denton

Graduate Research Theses & Dissertations

Fermi National Laboratory (Fermilab) and the European Council for Nuclear Research (CERN), forerunners in the exploration of the subatomic world, are both in the process of improving their particle accelerators with the Proton Improvement Plan II at Fermilab and the High-Luminosity Large Hadron Collider Accelerator Upgrade Plan (HL-LHC AUP) at CERN. Both particle accelerators have cavities that serve to either accelerate the particle beam or guide it into an optimal position and have the need for radio frequency (RF) power couplers to generate the field that controls the particle beams. When installing the coupler onto the cavity, a reliable vacuum …

Maternal Cumulative Trauma And Child Externalizing Behavior: Indirect Pathways Through Posttraumatic Stress Symptoms And Parenting Behaviors, Chynna Michelle Dubuclet

Graduate Research Theses & Dissertations

The present study aimed to add to the literature by analyzing the relationships present within the connection between maternal cumulative trauma and child externalizing behaviors. Specifically, this study examined the indirect effects that posttraumatic stress symptoms and parenting behaviors exert on the relationship between maternal cumulative trauma and externalizing behaviors. This study used structural equation modeling to assess the relationship between maternal cumulative trauma and child externalizing behaviors (i.e., conduct and behaviors, hyperactivity/impulsivity, opposition/defiance) through maternal PTSS and parenting behaviors (i.e., acceptance, lax discipline, overreactive discipline). Data was collected from 308 mothers (Mage = 20.59, 70.0% White/Caucasian) between April 2020 …

Longevity,Feeding Behavior, And Egg Production Of Adult House Flies (Musca Domestica) Provided With Potential Farm Foods, Anna Elise Grimenstein

Graduate Research Theses & Dissertations

House flies (Musca domestica) are cosmopolitan pests to both humans and livestock, and they can vector many diseases. House flies are especially associated with livestock facilities, as adult flies lay eggs in rotting organic matter such as manure. While it is understood that the diet an adult fly receives can affect biological parameters such as longevity and egg production, not much research has been done to address foods that are accessible to house flies in their natural habitat. The present study examined the longevity, feeding behavior, and egg production rates of adult house flies given different foods they would have …

A Wasteside Story: Establishment And Evolution Of A Wastewater Surveillance Lab, Through The Pandemic And Beyond, Syed Shahrukh Hyder

Graduate Research Theses & Dissertations

Wastewater based epidemiology is a fast growing and practical solution to monitor the spread of disease within a population. As the COVID-19 pandemic grounded the world to a standstill, methods to monitor its spread and prepare appropriate responses became vital to begin the return to normalcy. Such was the case in universities around the world where the campus and surrounding community were vital in fulfilling the educational mission in the face of a generational health crisis. The population in a midsize higher educational institute such as Northern Illinois University (NIU) is a broad mix of on-campus and off campus students, …

The Energetics Of Seasonality In Wild Diademed Sifaka (Propithecus Diadema): A Technical And Biological Validation Of Fecal Triiodothyronine Radioimmunassay, Casey Farmer

Graduate Research Theses & Dissertations

The energetic state of an animal has vital consequences for its fitness, but it can be difficult to detect through behavioral observations. The development of techniques to determine an animals’ energetic state non-invasively would allow conservation planners to rapidly assess the energy balance and conservation potential of individuals, groups, and populations. Thyroid hormones like triiodothyronine (T3) regulate and reflect metabolic state in mammals. T3 is a non-invasive biomarker that can be detected in feces and could potentially be used for this purpose. I perform the first validation of a commercially available T3 radioimmunoassay designed for humans on a wild strepsirrhine …

Helicopter Teaching From The Student Perspective: An Application Of Rhetorical And Relational Goals Theory, Denise Victoria Lee

Graduate Research Theses & Dissertations

Research on helicopter teaching from an instructor’s perspective has noted thatimplementing this type of teaching style comes with the potential harm to student learning and the value of education. Prior research, however, has focused on the instructor perspective of helicopter teaching. The purpose of the current study was to explore the student perspective of helicopter teaching behaviors through the lens of rhetorical and relational goals theory. Participants (N = 121) evaluated 17 helicopter teaching behaviors for frequency, negativity, clarity, caring, and positive impact on learning. Results indicated that students perceived helicopter teaching behaviors as strategies that enhanced their learning (i.e., …

Applying Synchrotron Saxs And Xas To Study The Microstructure Of Energy Conversion And Storage Materials, Lingzhe Fang

Graduate Research Theses & Dissertations

The microstructure of energy conversion and storage materials is a key determinant of physical properties and electrochemical performance. Synchrotron X-ray techniques, with their strengths of high flux and exceptional brightness, play an irreplaceable role in understanding nano and sub-nano structures. This helps the study of reaction mechanisms and benefits material design in energy conversion and storage area. Electrifying CO2 transformation using renewable energy offers a carbon-neutral solution to CO2 recycling and fuel generation. Among various feedstocks from the CO2 reduction reaction, CO, HCOOH, and CH4 have approached the performance thresholds for industry implementation. The application of single atom catalysts (SACs) …

Why Terrorism Varies In Indonesia, Titik Firawati

Graduate Research Theses & Dissertations

This dissertation studies when, why, and how local religious conflicts escalate to campaigns of terrorist violence. To do so, I examine two most-similar cases in Indonesia: Ambon and Poso. Each experienced significant local conflict between Christians and Muslims in the early 2000s. But while a peace treaty in Ambon in 2002 was largely successful, a similar treaty in Poso failed, and violence actually escalated into an organized campaign of terrorism against Christians. To understand why violence escalated to terrorism in one case, but not the other, I conducted six months of field research, including 98 interviews with original interviews with …

Gas-Phase Mass Spectrometry Studies Of Ternary Metal Carboxylate Complexes, Anthony James Fanizza

Graduate Research Theses & Dissertations

In the wake of climate change from rising CO2 emissions and with peak oil looming, the dive into sustainable fuels and energy is becoming increasingly essential. This dissertation investigates ternary ligand-metal cationic complexes for potential catalytic applications in the decarboxylation of carboxylic acids to produce bioavailable and carbon-neutral fuel sources. By utilizing gas-phase reactivity studies via mass spectrometry, namely, collision-induced dissociation and ion-molecule reactions, mechanisms can be elucidated in a regulated chemical environment. When paired with density functional theory calculations for molecular geometries, chemical interactions, charge densities, and energetics, system efficiencies can be further clarified presenting a more complete mechanistic …

Assessing The Relationship Between Neighborhood Inequality And Stem Employment For Underrepresented Minorities With Stem Degrees, Brian P. Hurley

Graduate Research Theses & Dissertations

The purpose of this study is to assess whether there is a relationship between neighborhood inequality in which underrepresented minorities (URMs) with STEM degrees reside and their employment in STEM fields. The current study deploys an Intersectional Theory (IT) research framework and Bourdieu’s Theory of Practice to identify the influence of neighborhood capital on successful matriculation through the STEM pipeline as well as variables that elucidate latent inequities in the STEM pipeline which lead to unequal outcomes for URMs. Generalized Linear Multilevel Models (GLMMs) are used to answer the research questions where the individual variables of gender, race, and age …

An Exploration Of The Sense Of Belonging For African American Women Licensed Clinicians In A Voluntary Professional Counseling Organization, Raushanah Jackson

Graduate Research Theses & Dissertations

Due to historical oppression in academe, the voices of African American women have been excluded, or unjustifiably limited, in academic research and from mainstream psychological thought. This study was one aim at understanding the experiences of belonging of women of African American ancestry who were clinically licensed professional members in a volunteer member counseling organization. Centering African American women’s voices was used through a lens of critical race theory and Black Feminist Thought to illuminate the structural, representational, and sociopolitical barriers that African American women face. An Interpretive Phenomenological Analysis approach was used to center the voices of five licensed …

Enhancing Usability In Aviation: Insights From User Experience Studies, Jennifer Ann Howard

Graduate Research Theses & Dissertations

The modern aviation industry is consistently embracing technological advancements to improve safety, efficiency, and training practices. Three user experience studies were conducted to examine the usability aspects of two digital components within aviation: the Federal Aviation Administration website and virtual reality head-mounted displays for aviation training.

The Federal Aviation Administration website serves as a central hub for aviation-related information, resources, and regulations for all domestic civil or military air operations within U.S. airspace. Usability is essential to ensure easy access to valuable data for aviation professionals, enthusiasts, and the public. Results from the experiences of ten pilots executing five tasks …

Pathology And Diagnosis In Inflammatory-Related Diseases: Covid-19 And Age-Related Macular Degeneration, Zane Russell Lacasse

Graduate Research Theses & Dissertations

Chronic inflammation and dysfunctional inflammatory responses are believed to be contributing factors to the severity of many diseases. Since the emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), it has been recognized that levels of inflammatory markers and the severity of coronavirus disease-2019 (COVID-19) cases are closely related. The work within this dissertation begins with establishing an alternative platform for the diagnosis of COVID-19 and explores ways to enhance the diagnostic utility of this platform. An alternative route for COVID-19 diagnosis was explored using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-ToF MS). The platform utilizes a non-invasive sampling technique …

Forecasting The One Month Ahead Joint Distribution Of The Carhart Four Factor Model Using A Copula Method, Michael Nebor

Graduate Research Theses & Dissertations

The Fama and French created factors of Market minus Risk Free (Mkt-RF), Small minusBig (SMB), High minus Low (HML), and the Carhart developed factor of Momentum (MOM) are frequently used together as a four factor model to explain the variation in returns of financial equities. This paper analyzes the joint distribution of these factors by forecasting the one month ahead joint distribution using various copula based methods. The VaR quantiles are calculated throughout the forecasted distribution at the .01, .05, .25, .50, .75, .95, and .99 quantiles. The forecasted distributions are compared against each other by analyzing the exceedances of …

Genomic Clustering And Comparative Analysis Of Sars-Cov-2 Variants And Subvariants In Year 2022, Fatemeh Nazaritiji

Graduate Research Theses & Dissertations

This study presents a bioinformatic analysis of SARS-CoV-2 genomes sampled in 2022, aimed at showing the genetic diversity and evolutionary patterns of the virus. A random selection of 1,000 genomes from a large collection of sequenced genomes was used to conduct an all-vs-all pairwise alignment, forming the basis for a genetic distance matrix utilizing thenumber of substitutions. This matrix served as a tool for clustering analysis, enabling the identification of distinct genomic variants and their relationships. Multidimensional Scaling (MDS) was employed to visualize the data in a two-dimensional space, revealing several distinct clusters that suggest the presence of diverse viral …

Understanding The Effects Of Organizational And Individual Level Motivations On Impression Formation For Persons With Disabilities In The Workplace, Lauren Francesca Luchetti

Graduate Research Theses & Dissertations

In recent years, organizations have begun paying more attention to hiring people with disabilities because of evidence supporting direct and indirect benefits to the organization. The business case for disability outlines the economic benefits for hiring those with disabilities, such as lower rates of turnover and absenteeism. Despite the motivations to hire those with disabilities, this population continues to suffer from higher rates of unemployment and underemployment. The current project attempts to shed light on the mechanisms that can improve the effectiveness of hiring motivations and disability hiring rates. In two experimental studies, the effect of the business case on …

Clinical Reasoning Development: Exploring The Role Of Instructor Feedback During Health Professions Clinical Education Experiences, Ryan T. Orrison

Graduate Research Theses & Dissertations

The growing complexity of the healthcare environment and the need to equitably address the health and well-being of a diverse patient population has increased the requirement for practical instruction and assessment of clinical reasoning in the training of health professionals. Formative assessment, in the form of feedback, is recognized as an essential instructional component in teaching clinical reasoning. This study aimed to investigate the role of feedback in developing clinical reasoning during clinical education.

This investigation consisted of three unique studies completed in phases. The scoping review methodology in phase one revealed six themes from the included articles (n = …

Netflix As A Transverse Transnational Media In Southeast Asia: Exploring The Philippine Context, Lady Aileen Ambion Orsal

Graduate Research Theses & Dissertations

This thesis examines how Netflix as a transnational Internet TV disrupted the media flow in Southeast Asia. As subscription to streaming platforms grew exponentially, the limited linear flow of contents in traditional TV was transformed into a more personalized viewing experience. Consumers binge-watching on a subscription video on demand service were given the agency to view diverse contents at a time and on a gadget they prefer while also being offered recommendations from the platform’s curated list. As Netflix expanded to over 190 countries around the world, it has employed localization strategies to provide culturally authentic contents through co-production with …

Amazing Or Awful? The Role Of Message Frames In Expectancy-Value Based Weight Management Intentions, Xuan Qian

Graduate Research Theses & Dissertations

This study examined the effective message frames in improving individuals’ weight management intentions. Focus on gain-framed and loss-framed messages, their interactions with expectancy and value were unveiled in both weight loss and weight loss maintenance conditions. A 2 (message frames: gain-framed vs. loss-framed) x 2 (weight management: weight loss vs. weight loss maintenance) online experiment (N = 249) was conducted. Participants were asked about their weight management experiences, read manipulated messages, and answered questions about perceived expectancies and values toward future behaviors. Results showed that gain-framed messages are more effective in arousing individuals’ intentions and values in both weight loss …

Mixed Mechanisms Of Multi-Site Phosphorylation, Suha Jayyousi Dajani

Graduate Research Theses & Dissertations

Multi-site phosphorylation is an important mechanism in cell biology that regulates protein function and activity. It also plays a critical role in a wide variety of cellular processes that control intra-cellular signaling. Studies on mono- and dual-site phosphorylation have been conducted theoretically and experimentally by researchers. However, there is little research on triple-site and multi-site mixed mechanism phosphorylation.

The aim of this research is to study and identify the number of positive steady states (multistationarity) in a mathematical model of a triple-site mixed mechanism, processive and distributive, phosphorylation network. This research is accomplished by means of ordinary differential equations, Jacobian …

On The Ground And From Above: A Multi-Factor Analysis Of The Direct And Indirect Drivers Of Tallgrass Prairie Small Mammal Communities, Erin Rowland-Schaefer

Graduate Research Theses & Dissertations

Tallgrass prairies are among the most globally threatened ecosystems, with only one percent of the historical extent remaining in Illinois. Prairie restoration is an essential strategy to preserve biodiversity and reestablish threatened species. Practitioners use management tools to shift the landscape context of prairie restoration sites, such as prescribed fire and land cover change. Managers can also impact the landscape connectivity and edge proximity of certain areas through the use of mowed driving lanes. The effects of these factors on small mammals, which are central in tallgrass prairie food webs and relevant to human health and restoration success, are not …

The Influence Of Media Usage On The Outcome Of Social Movement Campaigns In Southeast Asia, Rothsethamony Seng

Graduate Research Theses & Dissertations

Does the use of media strategies help social movements or mass protest movements in Southeast Asia achieve their goals? The prominent study in this area argues that social media, in particular, has done more harm than good for grassroots movements. Tufekci (2017) argues that social media provides little help compared to the regime. I argue that social media helps the movement through three important areas, including (1) amplifying the messages of the movements to shape public opinions and counter propaganda and misleading information from the government, (2) facilitating and mobilizing protestors to coordinate virtual or physical protests, sustaining the momentum, …

The Dna Double Stranded Break Damage Response Of U87 Gbm Cells Following Irradiation Treatment, Emma Louisa Planck

Graduate Research Theses & Dissertations

Glioblastoma Multiforme is one of the most aggressive forms of cancer and is becoming increasingly prevalent in the population, especially among young adults. An estimated 13,140 people in the United States will be diagnosed with GBM this year and an estimated 10,000 people in the United States will succumb to the disease. The 5-year survival for GBM patients is only 7.2% with a mean survival time of only 12-18 months. Even with subsequent chemotherapy and irradiation treatments GBM has a very high treatment resistance and has a recurrence rate of roughly 70%. Treatments such as radiation therapy induce lethal DNA …

International Graduate Student Challenges And Self-Efficacy When Studying In The United States, Kawthar Alfarhan

Graduate Research Theses & Dissertations

This study examined challenges international graduate students face in the United States regarding English language skills, cultural adaptation, and impacts on their academic self-efficacy. Ten international students from different countries were interviewed using a qualitative research method. The interviews explored international graduate students’ experiences after completing at least one year at the university. Specific focus areas included difficulties faced with English proficiency and cultural adaptation, how students described their self-efficacy in managing these challenges, the impacts on their academic performance, and strategies to support their self-efficacy.

The findings showed that self-efficacy as well as encouragement from peers and faculty helped …

Effort Of Reproducibility: Metrics, Methods, And Models To Navigate The Landscape Of Reproducible Research, Akhil Pandey Akella

Graduate Research Theses & Dissertations

Validating scientific claims is an elaborate process that involves researchers investing considerable time and effort to discover the validity of claims. It involves repeatability, reproducibility, and replicability, where each subsequent step requires increased effort and time. With the evolving nature of computational experiments and the exponential pace at which scientific publications are disseminated, researchers find it challenging to devote time, energy, and resources to assess claims made in papers of interest. Preemptive signals for reproducible effort can be helpful to researchers in filtering academic works of interest, thereby allowing them to adjust efforts based on need. Through this research, I …

Classic Taíno Foodways And Ritual Practices: A Comparative Paleoethnobotanical Analysis From Cinnamon Bay, St. John, Anna N. Chitwood

Graduate Research Theses & Dissertations

Macrobotanical analysis of Taíno habitation sites throughout the Caribbean has provided evidence of what comprised the Taíno diet. Although those analyses are important to our understanding of the Taíno, there has been a lack of analysis from ritual sites, and the data recovered from existing sites are limited. This thesis presents the results of analysis of paleoethnobotanical remains from Cinnamon Bay (VIIS 191), a shoreline Taíno ritual site located on St. John in the United States Virgin Islands (USVI) that dates to approximately 1000 CE – 1490 CE, in order to gain a better understand how Indigenous Taíno people interacted …

An Investigation Of The Impact Of Esser Relief Funds On Illinois High Schools, Douglas J. Wildes

Graduate Research Theses & Dissertations

During and in the immediate years after the global COVID-19 pandemic, the federal government has given school districts across the United States millions of dollars through a series of three final grants called the Elementary and Secondary Schools Emergency Relief (ESSER) Grant to help improve education, decrease student learning losses suffered during the shutdown, and make educational facilities safer for students and staff. This study examines ESSER Grant dollars and academic achievement data from 57 Chicagoland high school districts and assesses whether a correlation exists between how these funds were allocated and student achievement performance. A Pearson correlation coefficient was …