Digital Commons Network^™

A Computational Kinetics Model To Quantify Radiation Induced Chemical Products Of Atmospheric Gas Mixtures, Patrick Ables

Dissertations

This research is focused on the development of a computational model which will calculate the effects of radiation on the chemical composition of the atmosphere. The approach utilizes the open-source chemical kinetics toolkit Cantera to model the creation of radiation-induced reactant species within irradiated air mixtures. Chemical solutions are iteratively stepped toward chemical equilibrium within a ‘constantly stirred’ (homogeneous) reactor of fixed volume. Three different radiation chemistry models are implemented in several different pulsed and continuous radiation schemes. The first model includes the mechanisms and rates of a pulse radiation model from the literature to test the validity of the …

A Tale Of Two Diagonalizations: Methods To Diagonalize A 1-D Piecewise Constant Indefinite Schrödinger Operator, Sarah Wright

Dissertations

We present two numerical methods for computing the solution of a partial differential equation (PDE) for modeling acoustic pressure, known as an extra-wide angle parabolic equation, that features the square root of a differential operator. The differential operator is the negative of an indefinite Schrödinger operator with a piecewise constant potential. This work primarily deals with the 3-piece case; however, a generalization is made to the case of an arbitrary number of pieces. In the first method, the Rayleigh-Secant Method, through restriction to a judiciously chosen lower-dimensional subspace, approximate eigenfunctions are used to obtain estimates for the eigenvalues of the …

College For What . . . How Middle School Students From Low Socioeconomic Backgrounds Perceived Post-Secondary Education, Michelle Patrick

Dissertations

This study examines the attitudes and perceptions of middle school students from low socioeconomic backgrounds about attending post-secondary institutions. As research continues to explore the experiences of traditional high school students from low socioeconomic backgrounds and students' attendance into post-secondary institutions, research concerning middle school students from low socioeconomic backgrounds preparedness for college attendance has been limited. Using a phenomenological research design to obtain the study's results from fifteen students and thirteen parent interviews provided insight into the “lived experience” of the students’ and parents' attitudes and perceptions regarding college attendance. The study found that regardless of the parents’ and …

The Impact Of Hope On The Relationship Between Socioeconomic Context And Career Exploration, Hunter Christian Vincente Montoya

Dissertations

Economic instability in the United States has significant mental health implications for populations who experience limited occupational autonomy. Literature has demonstrated that career exploration plays an important role in positive occupational outcomes, and research has begun to establish a relationship between hope and career exploration. Hope has been further associated with myriad positive outcomes in the fields of career development and counseling psychology. The purpose of this study was to examine the relationships between socioeconomic status, hope, and career exploration as guided by Social Cognitive Career Theory, and to ascertain whether hope may moderate between socioeconomic status and career exploration. …

The Effect Of Parceling On The Measurement Invariance Of Us Students’ Trends In International Mathematics And Science Study (Timss) 2015 Math Attitude Scores, Kritika Thapa

Dissertations

Measurement invariance is crucial for making valid comparisons across different groups (Kline, 2016; Vandenberg, 2002). To address the challenges associated with invariance testing such as large sample size requirements, the complexity of the model, etc., applied researchers have incorporated parcels. Parcels have been shown to alleviate skewness, improve reliability, reduce the number of indicators, and produce a more stable solution (Bandalos & Finney, 2001; Matsunaga et al., 2021; Nasser & Takahashi, 2003). Despite these benefits, limited methodological research has been conducted on the effects of parcels on tests of measurement invariance. This dissertation investigated the effects of different total sample …

Origin Of The Mega-Streamlined Morphology In Ne Africa And Arabia: Remote Sensing And Field-Based Investigations, Mohamed Samy Mohamed Elhebery

Dissertations

Mega-streamlined landforms on Earth and Mars have been attributed to aeolian, glaciogenic, fluvial, and tectonic processes. Identifying the forces that shaped these landforms is paramount for understanding landscape evolution and constraining paleo-climate models and ice sheet reconstructions. Exhumed Late Ordovician glacial deposits and landscape of the North Gondwana are reported here for the first time from SE Egypt. Using field and remote sensing (Advanced Land Observing Satellite [ALOS], Phased Array L-band Synthetic Aperture Radar (PALSAR) radar, multispectral Landsat TM datasets, and digital elevation models (DEMs) I mapped the distribution of the Late Ordovician glacial features (i.e. deposits and landforms) in …

Visual Circuitry In Adaptive Behavior: Extraction Of Complex Visual Image Information By Arrays Of Non-Image Forming Eyes, Thomas Kipp Halladay Groves

Dissertations

A complete understanding of how neural circuitry underlies the detection and integration of visual cues continues to elude researchers in the 21st century. Since the dawn of life on earth, light has exerted enormous selective pressure on all living organisms. Visual systems represent one of the most common sensory systems in existence, with significant homologies among elements of these systems, such as photopigments and developmental genes. Offering nearly unmatched single cell access at all levels of its nervous system, the European medicinal leech (Hirudo spp.) is an excellent system in which to identify behaviorally relevant neuronal circuits. Hirudo evolved discrete …

Towards Reliable Hepatocytic Anatomy Segmentation In Laparoscopic Cholecystectomy Using U-Net With Auto-Encoder, Koloud Najem Alkhamaiseh

Dissertations

Despite the advantages of minimally invasive surgeries that depend heavily on vision, the indirect access and lack of the 3D field of view of the area of interest introduce some complications in the desired procedures. Fortunately, the recorded videos from these procedures offer the opportunity for intra-operative and post-operative analyses, to improve future performance and safety.

Deep learning models for surgical video analysis could therefore support visual tasks such as identifying the critical view of safety (CVS) in laparoscopic cholecystectomy (LC), potentially contributing to the reduction of the current rates of bile duct injuries in LC. Most bile duct injuries …

Experiences Of Middle School Students With Visual Impairments Accessing Technologies In Inclusive Classrooms, Anitha Muthukumaran

Dissertations

As the educational environment is moving more towards a technology-rich system, students with visual impairments (VI) educated in general education classrooms must be guaranteed equitable access to content curricula. The purpose of this study was to understand the experiences of middle school students with VI when accessing and using technologies in general education classrooms. In this multiple case study, three middle school students with VI were observed in general education settings for two school days. In addition to the students, general education teachers and teachers of students with VI (TVI) also participated in the study to understand how best they …

Perceived Support For Higher Education: Perspectives Of Refugee Students, Sibyl Rae Cornell

Dissertations

The purpose of this study was to gain a better understanding of how students who are refugees describe their social supports, with a focus on their relationships with those who are supportive of their interest in higher education both within and outside of the school system. Few studies have explored the social capital of these students, and how it may influence their decision to attend college. Therefore, narrative inquiry was used to explore the educational journeys of 13 refugee youth planning to attend higher education in the United States. Through semi-structured interviews, demographic surveys, and the creation of social support …

Principal Actions That Impact Teacher Retention In High-Poverty Schools, Amy Elizabeth Bekins

Dissertations

Teaching is a profession facing many challenges; among the greatest is high teacher turnover, which is even greater in high-poverty schools. Working conditions are ranked lower in high-poverty schools, contributing to the increased turnover in those schools. Principals have a high impact on teacher turnover, second in impact only to socio-economic status. The purpose of this study was to examine principal actions at schools that serve high poverty areas that are able to retain teachers. A qualitative case study was conducted where a high-poverty school was selected with approximately 80% teacher retention, allowing room for the principal to remove ineffective …

School Accountability Within The Dominican Republic: A Qualitative Study Of School Principals’ Beliefs And Knowledge, Massiel Cohen Camacho

Dissertations

The school accountability system in the Dominican Republic (DR) involves the use of several national assessments, the reporting of such data, and the training of principals on how to use such data as part of school improvement efforts. While this type of indicator accountability system does not include specific consequences, there is still significant measuring and reporting of student achievement data, with the implied connotation of teacher and principal responsibility for specific school outcomes. The problem addressed in this study was the lack of research on what school principals know about such school accountability in the DR, and how they …

Strategies To Increase Engagement In K-12 Stem Programs Among Bipoc Students Grades 3rd – 8th, Denisha C. Griffey

Dissertations

The WIRE Youth Development Programs, housed within the Lewis Walker Institute for the Study of Race and Ethnic Relations at Western Michigan University, Kalamazoo, MI foster two enrichment programs geared towards strengthening the gap in academic knowledge through STEM/STEAM activities. Since its inception, WIRE has impacted over 1,000 youth grades 3-8 among the BIPOC population through its programs, most notably the WIRE Math and Science Summer Camp and Saturday Academy. In 2020, during the height of the Covid-19 pandemic, many K-12 education school systems switched to remote learning. As a result of this transition, there was a decrease in access …

Multivariate Hierarchical Generalized Linear Model For Intensive Longitudinal Data With Incorporation Of Outcome Variability As A Predictor, Maryam Skafyan

Dissertations

In classical statistical problems, variability is often considered a nuisance parameter in both the technical and the practical sense. However, emerging evidence suggests that in certain settings, the underlying variability of subject measures may play an equally important role as other covariates in predicting future outcomes of interest. Intensive longitudinal data has become increasingly popular in many scientific applications, providing opportunities to explore the variability of predictors within subjects to address a wide range of research questions. Despite its potential, there remains a dearth of research on models that incorporate variation as a predictor in the mean model. Furthermore, there …

Effect Of Implementing Psychosocial Interventions As Pen Pals In General Chemistry, Kristofer Felix Kintner Reiser

Dissertations

General Chemistry has a high DFWI rate, disproportionately impacting students of marginalized identities (Anderson & Kim, 2006). This research investigates the hypothesis that the impacts of stereotype threat and imposter syndrome could be moderated by sharing with others through a pen pal activity. This embedded mixed method study recruited participants who were general chemistry students at a public university in the Rocky Mountain region over two years (n= 264). Participant affect was measured using the Measure of Chemistry Identity (Hosbein & Barbera, 2020), Theories of Intelligence Scale (Dweck, 2000), Chemistry Attitudes and Experiences-Self Efficacy (Dalgety et al., 2003), and general …

Impacts Of Internship Experiences On Professional Identity Development For Undergraduate Women Of Color In Engineering, Kathleen Victoria Armstrong

Dissertations

Women of color are historically underrepresented in STEM, specifically the field of engineering (National Science Board, National Science Foundation, 2019). In considering ways to assist in women of color’s retention and persistence in engineering, it is necessary to recognize the role internships, a form of experiential education, at the undergraduate level impact professional identity development. The purpose of this study was to understand how internship experiences shape professional identity development for undergraduate women of color in engineering. Using a constructivist epistemology, a theoretical framework integrating social cognitive theory and intersectionality, and an interpretive methodology; the researcher utilized semi-structured interviews and …

On Phishing: Proposing A Host-Based Multi-Layer Passive/Active Anti-Phishing Approach Combating Counterfeit Websites, Wesam Harbi Fadheel

Dissertations

Phishing is the starting point of most cyberattacks, mainly categorized as Email, Websites, Social Networks, Phone calls (Vishing), and SMS messaging (Smishing). Phishing refers to an attempt to collect sensitive data, typically in the form of usernames, passwords, credit card numbers, bank account information, etc., or other crucial facts, intending to use or sell the information obtained. Similar to how a fisherman uses bait to catch a fish, an attacker will pose as a trustworthy source to attract and deceive the victim.

This study explores the efficacy of host-side APT (Anti-Phishing Techniques) based onWebsite features like Lexical, Host-Based, or Content-Based …

Simulating Strongly Coupled Many-Body Systems With Quantum Algorithms, Manqoba Qedindaba Hlatshwayo

Dissertations

The complexity of the nuclear many-body problem is a severe obstacle to finding a general and accurate numerical approach needed to simulate medium-mass and heavy nuclei. Even with the advent of exascale classical computing, the impediment of exponential growth of the Hilbert space renders the problem intractable for most classical calculations. In the last few years, quantum algorithms have become an attractive alternative for practitioners because quantum computers are more efficient in simulating quantum physics than classical computers. While a fully fault-tolerant universal quantum computer will not be realized soon, this dissertation explores quantum algorithms for simulating nuclear physics suitable …

Missing Value Imputation For Single Omics And Multi-Omics Data, Meng Song

Dissertations

The integration analyses of multi-omics data have the advantages of extending our understanding of biological system across multiple omics layers, unraveling the functional mechanism of complex disease development, and refining the discovery of novel drug targets. However, multi-omics studies often face challenges such as data heterogeneity, missing values problem, interpretability, and imbalance classes. Among these challenges, the missing values problem is a critical issue for large cohort studies as not all samples will get a complete measurement for all the omics layers. To address the problem of missing values in multi-omics data, I focused on the imputation of completely missing …

Neurodiverse Perceptions Of Inclusivity In The Workplace, Shannon Lively

Dissertations

The increase in neurodivergent professionals in the workplace has led to a significant need for researchers to examine neurodiversity inclusion in the workplace. Research has portrayed workplace inclusion as the perception that the individual is a valued member of a workgroup through satisfactory experiences of belongingness and uniqueness. Through semi-structured interviews with 20 neurodivergent professionals, this study examined how they view inclusion, exclusion, and cope with exclusion in the workplace. The neurodivergent participants identified six inclusion and six exclusion categories. Results were largely consistent with previous inclusion research, however, one novel category, flexible accommodations, suggests the importance of considerate accommodations …

Allied Health Faculty Members’ Perspective On Interprofessional Collaborative Practice: A Hermeneutic Phenomenological Study, Prajakta Khare-Ranade, Margaret Newsham Beckley, Mary Geders Falcetti

Dissertations

A framework for interprofessional collaborative practice (IPCP) was developed by the World Health Organization (WHO) (WHO, 2010) in response to the need to address the complicated conditions that exist in today’s health systems. Much of the focus of today’s health service delivery is predicated on the social determinants of health (Barzansky et al., 2019), which refer to the environmental conditions associated with where people are born, live, go to school, work, play, age, and worship that have an impact on health, function, quality of life, and risks (Healthy People 2030, n.d.). IPCP is thought to be the only approach effective …

Topological Data Analysis Of Convolutional Neural Networks Using Depthwise Separable Convolutions, Eliot Courtois

Dissertations

In this dissertation, we present our contribution to a growing body of work combining the fields of Topological Data Analysis (TDA) and machine learning. The object of our analysis is the Convolutional Neural Network, or CNN, a predictive model with a large number of parameters organized using a grid-like geometry. This geometry is engineered to resemble patches of pixels in an image, and thus CNNs are a conventional choice for an image-classifying model.

CNNs belong to a larger class of neural network models, which, starting at a random initialization state, undergo a gradual fitting (or training) process, often a …

High Resolution Intracavity Laser Absorption Spectroscopy Of Transition Metal-Containing Diatomic Molecules, Kristin Bales

Dissertations

Three transition metal-containing diatomic molecules have been studied using intracavity laser spectroscopy. Many of the transitions were recorded using a Fourier-transform spectrometer for detection, allowing collection at Doppler-limited resolution for the gas phase molecules. Several vibrational bands in two electronic transition systems of tantalum fluoride (TaF) have been analyzed, and new molecular constants provided. Transitions involving six electronic states of tungsten sulfide (WS) have been analyzed, with new and updated constants provided, including a deperturbation analysis of three vibrational bands in two of the states. Finally, a fresh perspective on two electronic states of tungsten oxide (WO) included a deperturbation …

The Impact Of Collaboration, Problem Solving, And Creativity On Computer Programming Education For Middle School Girls, Amanda Meek

Dissertations

Despite high scores and abilities, girls lose interest in science and math throughout middle school. According to the Bureau of Labor Statistics, jobs in the computer science research field will grow 19% by 2026; however, only 18% of the bachelor’s degrees in computer science are earned by women in the United States (ComputerScience.org, 2021). New technology and inventions are being created without the benefit of more diverse perspectives and input from females. There is a need to engage girls and maintain their interest throughout middle school and beyond. Additional research needs to be conducted about the impact and best practices …

Moving Forward With Music To Promote Student Growth: A Mixed Methods Study With 9th-Grade Algebra 1 Students, Willie Mae Dean

Dissertations

The purpose of this mixed methods study was to investigate what effect music had on student achievement and student behavior during independent practice time for 9th-grade Algebra 1 students. Benchmark assessments from the participating district, a focus group of six students, and four in-person teacher interviews provided the data for this study. The beginning-of-year Galileo Algebra 1 benchmark assessment was used as a baseline for the study. Algebra 1 teachers were asked to participate in one of three ways, to play teacher-selected music, to allow students to listen to their own music, or allow no music to be played during …

Near-Ir Spectroscopic Analysis Of The Primary Volatile Composition Of Long And Short-Period Comets, Younas Khan

Dissertations

Comets are among the most well-preserved objects that formed in the protosolar nebula ∼4.5 Gyr ago. Hence, they are important for understanding various aspects of the formation, evolution, and habitability of the solar system. Multiple primary volatiles (molecules directly sublimating into the coma from the nucleus) emit via rovibrational transitions in the near-IR, providing opportunities to calculate their abundances. To date, only ∼50 comets have been characterized for their primary volatiles, with the short-period Jupiter-family comets (JFCs) being significantly underrepresented. In contrast, hundreds of comets have been sampled at optical/UV wavelengths, primarily for the composition of daughter species, leading to …

Evaluating Middle School English Language Learners’ Science And Literacy Proficiency, Yasemin Ozkaya

Dissertations

The academic success and English proficiency of ELL students are receiving more attention as a result of the growing number of ELL students and the demand for accountability and assessment in education. It is widely accepted that ELL students struggle on state standardized tests because they lack the cognitive academic language abilities needed to succeed on extensive subject evaluations (Thakkar, 2013). According to Abedi and Dietel, ELLs' academic performance lags behind that of other segments of population, and the attainment gap reduces only slightly over time (2004).

The NWEA archival data of 6th, 7th, and 8th grade students who attended …

Mating Burrows In The Fiddler Crab Leptuca Pugilator: How A Key Resource Is Contested, Constructed, And Shared, Zachary Michael Lane

Dissertations

The Atlantic sand fiddler crab, Leptuca pugilator, is found on sandy, vegetated beach across a large portion of the United States’ Atlantic and Gulf of Mexico coasts and is iconic in regions where dense populations of the species occur for its charismatic courtship, competitive, and foraging behaviors. The social dynamics of the species are complex. Reproductively active males maintain mating territories in the dangerous heat of the intertidal zone, away from their food source at the water’s edge, where they inhabit specialized mating burrows. These mating burrows are essential to successful female reproductive success, and when it is time …

Case Study On Increasing The Amount Of High School El Students College And Career Ready, Octavio Patino

Dissertations

Purpose: The purpose of this qualitative multicase study was to describe the leadership practices of high school principals who work with their staff to close the college and career achievement gap for English language learners (ELLs) based on Anderson and Ackerman Anderson’s (2010) change model (mindset, behavior, culture, and systems).

Methodology: This qualitative multicase study was conducted through interviews with four high school principals of Title I schools in California. I selected qualitative methods because they describe the leadership practices that worked with their staff to close ELLs’ college and career readiness (CCR) gap.

Findings: Close examination of data from …

Gold(I)-Hydroarylation In Polymer Modification – Alkynes And Alkenes With Unexpected Reactivity, Samuel B. Hunt

Dissertations

Polymer modification is crucial for developing new properties and materials from recalcitrant waste polymers. Synthetically, polymers possess a chemical inertness that renders their functionalization challenging. Specifically, the omnipresence of C–H bonds in all commercial polymers endows their chemical resistance. Thus, developments in C–H activation chemistry are crucial to polymer diversification processes and allow for fundamental insight into the role of material processing conditions on novel chemical reactions. Au(I)-chemistry has recently come to the fore owing to a unique chemical reactivity nonexistent with other transition metals. The alkynophilicity of Au(I), in tandem with their insensitivity to common polymer processing conditions (air, …