Digital Commons Network^™

Collisional Broadening And Shift Of Rubidium 42D5/2 → N2F Line Shapes With Helium And Electrons, Dillon T. Nice

Theses and Dissertations

Line shapes for three rubidium 4²D_5/2 → n²F transitions were collected using pump probe spectroscopy. Broadening rates for Rb-He collisions ranged from 139–171 MHz/Torr and shift rates ranged from 113–146 MHz/Torr. Then, line shapes were collected at different alkali densities to measure electron density. Electron density had a clear “runaway ionization density threshold” around 1.5×10¹³ cm⁻³. The three transitions agreed within 2% on the observed fractional ionization when calculated using the observed Stark width but did not agree on the observed fractional ionization when calculated using the observed Stark shift. These results …

Impact Of Operational Ladar Occlusions On Point Cloud Instance Segmentation, Andrew D. Gibson

Theses and Dissertations

Data exploitation techniques are the enabler for technological advancements in military ISR applications of ladar ISR. By identifying instances of military objects in observed scenes, point cloud deep learning models can unlock new standards of real-time information delivery to warfighters. Although current deep learning training datasets do not include real-world collection occlusions consistent with military applications, this research characterizes SPT model performance by adding occlusions to the DALESObjects dataset via artificial flyby simulations.We find that a baseline model trained on unoccluded data suffers performance degradation on both semantic and instance segmentation tasks when evaluated on occluded data, but that the …

Developing A Lean Spacecraft Test And Evaluation Architecture For A Contested Space Domain, Stephen K. Tullino

Theses and Dissertations

The US Space Force (USSF) is currently investigating possible opportunities to improve the testing paradigm of spacecraft in order to get assets on-orbit faster, while maintaining suitable quality to meet mission needs in a contested space environment. To support this goal, USSF’s approach to test and evaluation (T&E) is centered around the concept of integrated test. In this research, the space text lexicon is defined, addressing the ambiguities on exactly what integrated test is with respect to spacecraft systems development and on-orbit mission assurance. This research considered any statistical trends in categorical discrepancies (i.e., anomalies) during prelaunch integration and test …

Remote Profiling Of Atmospheric Turbulence: Enhanced Resolution With Stacked Rayleigh Beacons In Tardis, Benjamin C. Wilson

Theses and Dissertations

A stacked beacon turbulence profiling methodology has been introduced and applied to have increased profiling on the Turbulence and Aerosol Research and Investigation System (TARDIS). The model was derived and demonstrated the applicability through discussion on data processing and inversion processes. The methodology was applied for two different nighttime experiments, one in Summer and one in Fall. C 2 n profiles were derived into the 1300 m altitude ranges for both nights and the summer experiment was compared to a co-located DELTA Sky measurements and LEEDR generated Climatological profiles. The comparison implied promise in the methodology with additional work needed …

Exploring Grit Among Hispanic Undergraduates At A South Texas Hispanic-Serving Institution, Lorraine Pedroza

Theses and Dissertations

Although an increasing number of Latinx students are enrolling in higher education, only a small percentage graduate from two and four-year universities compared to their counterparts. This study explored the relationship between demographic variables and grit scores among undergraduate students. Grit, defined as the perseverance and passion for long-term goals (Duckworth, 2009), has gained significant attention in education research due to its association with academic success and performance. This study utilized a quantitative research design to compare grit scores between junior and senior undergraduate students. A total of 166 participants were included in the analysis, with 69 respondents classified as …

An Examination Of Adverse Childhood Experiences As A Predictor Of Physical Activity In Emerging Adults, Christian Alvarado

Theses and Dissertations

Previous research highlights the impact of adverse childhood experiences (ACEs) on health, yet their association with physical activity (PA) remains underexplored. This study investigated this relationship in a predominantly Hispanic sample of emerging adults, examining whether perceived barriers and benefits to exercise mediate the ACEs-PA relationship. A total of 442 college students aged 18-29 completed all measures. ACEs were assessed using the Adverse Childhood Experiences Questionnaire, PA levels through the International Physical Activity Questionnaire-Short Form (IPAQ-SF), and perceived exercise barriers/benefits via the Exercise Benefits/Barriers Scale. Bootstrapped Pearson correlations indicated a significant negative association between perceived barriers to exercise and PA …

“Overcoming Is Everything”: Testimonios From Latina School Leaders Navigating Eurocentric Curriculum, Martha Elena Garza

Theses and Dissertations

The purpose of this study was to unveil how school leaders, particularly school principals, navigate Eurocentric curricular structures in the implementation of bilingual programming. This is a relevant study given the widespread issues and concerns circulating around the achievement of English Learners, recent immigrants, and the politicized arena of testing and accountability. The research question that guided this study was: 1) How do school leaders navigate Eurocentric curricular structures in efforts to implement EL programming? In order to build background knowledge and layout the framework for this study, critical race theory, LatCrit, testimonio and eurocentrism had to be explored with …

Unanswered Calling: The Dynamics Of Occupational Calling Misalignment Between Leader And Follower, Hilda Obiri-Yeboah

Theses and Dissertations

Emerging research about occupational calling has shifted from occupational psychology to the organizational behavior field. However, the current research mostly focuses on individual calling but ignores the dynamics between varying levels of leader and member occupational calling interactions and potential outcomes. Guided by Social Exchange Theory and leader-follower fit, this thesis investigates four leader-follower occupational calling alignment and misalignment situations and their differentiated attitudinal and behavioral outcomes. Moreover, it identifies important boundary conditions that mitigate the negative effects of the misalignment. This paper synthesizes existing literature and presents a comprehensive model to understand occupational calling's impact on leader-follower dynamics. It …

Novel Equimolar Medium Entropy Alloy (Ti-W-Mo) Via Selective Laser Melting For High Temperature Applications, Lindsey A. Salazar

Theses and Dissertations

High-temperature strength and high environmental resistance are necessary characteristics for materials under extreme working conditions in aerospace, nuclear, and chemical industries. In this study, a novel refractory medium entropy alloy (MEA) was developed from tungsten (W), titanium (Ti), and molybdenum (Mo) via an additive manufacturing process, selective laser melting (SLM). Through process optimization, (i) the formation of brittle intermediate phases was suppressed, (ii) the complete melting of tungsten particles was achieved, and (iii) a pure solid solution was formed. Due to the addition of Ti and Mo, the resultant alloy showed outstanding high-temperature strength compared to other tungsten alloys. The …

Validation Of Harmonized Cognitive Assessment Protocol (Hcap) In Egypt: A Sub Study Of The Egyptian Longitudinal Study Of Aging (Al-Seha), Sara Ayman Moustafa

Theses and Dissertations

Abstract Building upon the insights gained from the AL-SEHA pilot study, which underscored the pressing need for comprehensive cognitive assessment tools in Egypt, a subsequent research initiative was launched. This initiative sought to address the escalating burden of dementia and Alzheimer's Disease Related Dementias (ADRD) by adapting and validating the Harmonized Cognitive Assessment Protocol (HCAP) for the Egyptian context. The validation study, conducted with 300 participants aged 55 and over, drawn from diverse backgrounds and healthcare settings in Cairo, Mansoura, and Beni Suef, demonstrated the HCAP's effectiveness across different age and education levels within the Egyptian population. The tool exhibited …

Supporting Latinx Preservice Teachers For Implementing Phenomenon-Based Science To Promote Their Understanding Of The Three Dimensions Of Science Learning With An Emphasis On The Nature Of Science (Nos), Leslie Y. Garrido

Theses and Dissertations

As the adoption rate of the Next Generation Science Standards (NGSS) continues to rise in the United States, there is an increasing need for the development of high-quality instructional materials that reflect NGSS and effectively prepare teachers for its implementation. The NGSS aim to foster an understanding of three interconnected dimensions in students: science and engineering practices (SEP), crosscutting concepts (CCC), and disciplinary core ideas (DCI), along with an understanding of the nature of science (NOS). These standards envision students continuously revising their knowledge through the investigation of real-world phenomena using these dimensions. The State of Texas recently adopted and …

Exporting Sysml Designs To Simulink, Drew Q. Broadbent

Theses and Dissertations

Various software systems have been developed to aid a systems engineer in evaluating system requirements, such as Dassault’s Magic System of Systems Architect (MSOSA) and MathWorks’ Simulink. Both software packages have different strengths; therefore, it is beneficial to export models from one software package to another. MSOSA provides a built-in tool that facilitates this transfer, built upon the Extension for Physical Interaction and Signal Flow Simulation (SysPhS) standard. However, the process is often unreliable and error prone and online documentation is largely lacking. This research used extensive trial and error to fill in the documentation gaps and create a method …

Disposal And Earth-Moon Escape From Cislunar Orbits Using Non-Linear Programming Techniques, Sam T. Loeffler

Theses and Dissertations

This thesis involves theoretical and numerical analysis of trajectories off of cislunar orbits to determine the reachability and escape of various impulsive Δ^→v. The research will propagate trajectories using three body dynamics from various orbit families around the Earth-Moon Lagrange points and find low energy transfers that escape the Earth-Moon system. In order to achieve this, various different nonlinear programming solvers in MATLAB will be used to explore low energy impulsive escape transfers from common cislunar orbit families given long periods of computation time. After many points on cislunar orbits are analyzed, the data will be analyzed to …

Military Veteran Students’ Perceptions Of Support In College Writing Classrooms: A Qualitative Case Study, Jacqueline M. Beamen

Theses and Dissertations

Current literature indicates a disconnect between military veteran students’ experiences in college and what colleges claim they are doing to support these students. How support is manifested in writing classes at a medium-sized community college, as perceived by veteran students themselves, was unknown. This qualitative case study aimed to establish a deeper understanding of the unique needs of these students and how and whether they experienced support in their community college writing classrooms. The findings of this study showed that the participants’ military experiences impacted their perceptions of the college and of their writing classes. While they valued structure, rigor, …

Perceived And Preferred Methods To Adult Language Learning, Suzie Tse

Theses and Dissertations

The purpose of this research study is to understand the adult language learners in formal learning setting and know what do they perceive as the main methods of teaching and what do they prefer instead. If there is a gap between preferred methods of learning and perceived methods of learning, then there is a need that needs to be addressed. This is important because many students find language learning at best ineffective and at worst impossible. I hypothesize that there will be a difference between adult student perception and preference because student focuses more on speaking and listening skill over …

Utilizing Students’ Technological Knowledge To Develop Critical Reading Skills And Digital Literacy Identities, Rosemarie Mcgraw

Theses and Dissertations

This study aims to explore how teachers can purposefully integrate and connect students’ digital literacy funds of knowledge into in-school digital literacy meaning making to enhance critical reading and thinking, and how it supports students’ development of their digital literacy identity. The theories that guided this thesis were from New London Group, Freire, Gee, Knobel, and Lankshear. This was a qualitative research study that collected data from surveys, interviews, observations, and student work samples. Over the course of the study, students participated in a controlled choice research unit. Throughout the study, students received specific instruction on how to use multiliteracies …

Flexible And Rigid Endoscopic Evaluation Of In Vivo Rabbit Larynges: A Pilot Study, Shauntel Mei Li Anderson

Theses and Dissertations

The purpose of this investigation was to determine the comparability of flexible endoscopy to rigid endoscopy in the examination of rabbit vocal folds in vivo. This work was conducted within a larger parent project that has investigated the adverse effects of combination inhaled corticosteroids (ICs) on voice function in animal models and humans. In this study, both flexible and rigid vocal fold imaging was performed on eight rabbits; four having received ICs and four that were from control conditions. Original recordings were examined frame-by-frame to identify similar views, zoomed in and zoomed out, for flexible and rigid samples. Images were …

Identifying Barriers To Sustainability Of Dual Language Immersion Programs In Utah Schools, Jennifer Leigh Rowley

Theses and Dissertations

Dual Language Immersion (DLI) educational programming began in Utah in 2008. Within three short years, DLI programs in Utah schools had grown from 5 to 58 programs statewide. Presently, Utah now has over 301 DLI programs, including instruction in Spanish, Chinese, French, Portuguese, Russian, and German. DLI programs have many benefits and have attracted many student families. However, not much research has been done on program planning, implementation, and the sustainability of DLI programs within individual school cultures and climates. This study will examine the satisfaction level of faculty, staff, administrators, and parents at DLI schools (including how supported/understood each …

Stress And Coping Mechanisms Of Non-Traditional International Doctoral Students, Ndidi Patience Iwuagwu

Theses and Dissertations

Higher education institutions are battling with the shrinking enrollment rate of students and the various college alternatives (Drozdowski, 2022); however, it has been evidenced in the literature that these issues can be augmented with international student enrollments and adult learners (Donaldson, 2022). Pursuing a doctoral degree is a tedious move (Devonport & Lane, 2014), and leaving one’s comfort zone to study in a different land for non-traditional international students can be exhausting due to the responsibilities at hand. Thus, this qualitative study examines the stressors experienced by non-traditional international doctoral students, the coping mechanisms utilized in the cause of these …

Knowledge Of Breast Cancer Risk Factors And Willingness To Undergo Screening Among Female Faculty, Staff, And Graduate Students Of Illinois State University, Esther Oshaji

Theses and Dissertations

Breast Cancer (BC) is a leading cause of cancer deaths in women worldwide. Early detection is key to combating the disease. Despite the U.S. having one of the highest BC rates globally, there is limited research on awareness of BC risk factors and willingness to undergo screening among university students, faculty, and staff. Drawing on the constructs of the Health Belief Model, this study assesses the knowledge and predictors of BC screening behaviors among female graduate students, faculty, and staff at a U.S. Midwestern University. This group is particularly important as BC risks increase with age. Understanding their perceptions of …

Utilizing B-N, B-O, And B-F Interactions Toward Novel ( 5+2 ) Cycloadditions, Seth Ian Corrie

Theses and Dissertations

Cycloadditions are capable of producing multiple bonds in a single step with excellent atom economy, and they are well suited to generate a great deal of complexity in one step. Cycloadditions can transform mostly linear molecules into three dimensional molecules, which is incredibly important for drug synthesis. The Mitchell group research has revolved around uncovering the mechanisms involved in silyloxypyrone (5+2) cycloadditions. An improved understanding of the reactivity of silyloxypyone (5+2) cycloadditions has allowed for more efficient exploration of techniques to improve the utility of (5+2) cycloadditions and the complexity of cycloadducts. Tethers are utilized to provide stereochemical and entropic …

Exploring The Gap Between Self-Assessed And Actual Language Proficiency: A Comparative Analysis Of Japanese And Romance Language Learners, Megan Scarlet Keys

Theses and Dissertations

This study explores self-assessment accuracy among Japanese second language (L2) learners compared to learners of Romance languages. This research aims to investigate the extent of accuracy in self-assessment among Japanese learners and compare it with their counterparts studying Romance languages. Additionally, the study explores the variables influencing the accuracy of self-assessment in this context. The participants in this study comprised 144 undergraduate students enrolled in Japanese, French, Spanish, or Portuguese courses at Brigham Young University. Most participants possessed practical experience using their L2 in the target cultural context, complementing their academic coursework. The Language Ability Self-Evaluation Resource (LASER) was utilized …

Customization Of Large Language Models For Causal Inference And Data Quality, Xingqiao Wang

Theses and Dissertations

In the burgeoning fields of artificial intelligence (AI) and natural language processing (NLP), Large Language Models (LLMs) have emerged as powerful tools for understanding complex textual data. This dissertation focuses on the novel customization of LLMs for enhancing causal inference in pharmacovigilance and improving entity matching for data quality—two critical challenges in healthcare analytics and data management. Through an in-depth exploration of encoder and decoder LLMs, this study illustrates how domain-specific customization can significantly advance the processing and interpretation of textual information. For pharmacovigilance, it demonstrates how tailored LLMs can extract causal relationships from adverse event reports, offering a new …

Effect Of Cystic Fibrosis Transmembrane Conductance Regulator (Cftr) Loss In Lung Adenocarcinoma (Luad), Marilyn G. Vallejo Alvarez

Theses and Dissertations

Lung adenocarcinoma (LUAD) is the most common form of non-small cell lung cancer in the United States and is a major cause of cancer-related mortality. Patients with LUAD experience severe pulmonary symptoms and often progress to metastatic disease. Our previous work has shown that LUAD cells downregulate lung cell identity programs across cancer progression such as genes involved in the maintenance of epithelial barrier integrity. For example, CFTR (Cystic Fibrosis Transmembrane Conductance Regulator), a water and bicarbonate channel, is expressed in normal alveolar type 2 (AT2) cells and is downregulated in cells that give rise to LUAD. Although the loss …

Using Rapid Protein Degradation To Determine The Effect Of Runx1 Loss-Of- Function On Dna Damage Accumulation And Repair., Jackriel Pina Morales

Theses and Dissertations

Germline mutations in RUNX1 are associated with familial platelet disorder with a predisposition to myeloid malignancy (RUNX1-FPDMM), in which patients present with low platelet counts,excessive bleeding and bruising, and an increased risk of Acute Myeloid Leukemia (AML)/Myelodysplastic Syndrome (MDS) development throughout their lifetime. To understand how these loss-of-function mutations in RUNX1 drive predispose to malignancy, it is important to develop a detailed understanding of the molecular basis of RUNX1 function. While RUNX1 is a transcription factor, preliminary data from our group and work from others suggests that RUNX1 also interacts with proteins that are critical for DNA damage …

Egypt’S Legal Modernism: Challenging The National Discourse, Mohamed A. El-Deeb

Theses and Dissertations

Egypt’s legal modernity is the story of the modern Egyptian state itself. Reforming the country’s judiciary in the late nineteenth century was meant to achieve ambitious aims beyond the functionality of a justice system. The utmost goal was the country’s independence from the suzerainty of the Ottoman Empire. The judicial reforms modernized the Egyptian state and built a judiciary and legal community like no other place. Egypt achieved its independent judiciary before gaining its political independence. That was a remarkable achievement of the judicial reform. That rich part of Egypt’s modern history is negated and disregarded from public awareness. Not …

Foam Fraction Flow: Using Mls-Mpm With Volume Fractions To Simulate Low-Density Dry Foam, Alexander Neville

Theses and Dissertations

Foaming bubbles are a common element seen throughout both nature and man-made civilization. All types of bubbles behave variably. For example, foams float in water, splash out from buckets, and are squeezed out of hand soap dispensers. Due to their complexity and variance in behavior, they can be expensive to simulate and difficult to portray realistically. When simulating dense concentrations of bubbles with little free-flowing water, such as soap films, three variables need to be accounted for: how the fluid will move, how the bubbles will be sized, and how the bubbles will behave when they come into contact with …

Attitudes, Opinions, And Beliefs Of Teachers Toward Dual Immersion Programs In Utah Schools, Amy Lynn Hawks

Theses and Dissertations

Dual language immersion programs have been on the rise in the United States as a proven effective form of bilingual education. As of the 2018–2019 academic year, Utah had 224 dual language immersion (DLI) programs; 113 Spanish, 65 Chinese, 30 French, 13 Portuguese, 2 German and 1 Russian. Roughly 34,000 students were enrolled in one of these programs. The DLI programs in Utah use a 50:50 model, which means half of the students' day is in the partner language model and half is in English. The purpose of my study was to research teachers’ attitudes, opinions, and beliefs within a …

Minimal Specialization: The Coevolution Of Network Structure And Dynamics, Annika King

Theses and Dissertations

The changing topology of a network is driven by the need to maintain or optimize network function. As this function is often related to moving quantities such as traffic, information, etc., efficiently through the network, the structure of the network and the dynamics on the network directly depend on the other. To model this interplay of network structure and dynamics we use the dynamics on the network, or the dynamical processes the network models, to influence the dynamics of the network structure, i.e., to determine where and when to modify the network structure. We model the dynamics on the network …

Digital Technology Usage Behaviour Among Unorganised Retailers In Tamil Nadu, Karthik Ram M

Theses and Dissertations

Unorganised retail, consisting of small local shops offering various products, holds a significant market share of 81.50 %, according to the India Retailer Report (2023). Despite the burgeoning e-commerce and organised retail sectors, unorganised retail remains a preferred shopping choice for many consumers.

In response to the sector's potential, several startups have emerged, aiming to support kirana stores. While these startups have primarily focused on horizontal solutions to enhance efficiency, there is a growing need for tailored solutions addressing the specific requirements of unorganised retailers.

Introducing the Dukantech (Dukan in hindi meaning ‘Shop’) model as a solution, this approach enables …