Digital Commons Network^™

Bacterial Motion And Spread In Porous Environments, Yasser Almoteri

Dissertations

Micro-swimmers are ubiquitous in nature from soil and water to mammalian bodies and even many technological processes. Common known examples are microbes such as bacteria, micro-algae and micro-plankton, cells such as spermatozoa and organisms such as nematodes. These swimmers live and have evolved in multiplex environments and complex flows in the presence of other swimmers and types, inert particles and fibers, interfaces and non-trivial confinements and more. Understanding the locomotion and interactions of these individual micro-swimmers in such impure viscous fluids is crucial to understanding the emergent dynamics of such complex systems, and to further enabling us to control and …

Colloidal Behavior Of Nanobubbles And Their Application In Enhancing Plant Growth: Mechanisms Of Nanobubble Interactions With Microbial And Soil Species, Shan Xue

Dissertations

Climate change has resulted in increasing uncertainties of water resources and disturbance on agricultural activities. For example, the shortage of water resources, land erosion and pollution from runoff significantly affect agricultural sustainability. This dissertation research focuses on the fundamental studies of nanobubble (NB) water and explores the benefits for irrigation to enhance plant germination and growth. Unlike bulk bubbles, NBs exhibit prolonged stability in water and possess large surface areas that facilitate efficient mass transfer and potential tailored reactions (e.g., disinfection). However, the enhancement mechanisms for NBs on seed germination and plant growth remain elusive.

This research first evaluated the …

Data-Driven 2d Materials Discovery For Next-Generation Electronics, Zeyu Zhang

Dissertations

The development of material discovery and design has lasted centuries in human history. After the concept of modern chemistry and material science was established, the strategy of material discovery relies on the experiments. Such a strategy becomes expensive and time-consuming with the increasing number of materials nowadays. Therefore, a novel strategy that is faster and more comprehensive is urgently needed. In this dissertation, an experiment-guided material discovery strategy is developed and explained using metal-organic frameworks (MOFs) as instances. The advent of 7r-stacked layered MOFs, which offer electrical conductivity on top of permanent porosity and high surface area, opened up new …

Variable Resolution Smoothed Particle Hydrodynamics Schemes For 2-D And 3-D Viscous Flows, Francesco Ricci

Dissertations

Smoothed Particle Hydrodynamics (SPH) is a Lagrangian particle-based method for the numerical solution of the partial differential equations that govern the motion of fluids. The main aim of this thesis work is to better enable the applicability of SPH to problems involving multi-scale fluid dynamics. In the first part of the thesis, the capability of the SPH method to simulate three-dimensional isotropic turbulence is investigated with a detailed comparison of Lagrangian and Eulerian SPH formulations. The main reason for this first investigation is to provide an assessment of the error introduced by the particle disorder on the SPH discrete operators …

Computational And Experimental Investigation Of Elemental Sulfur And Polysulfide, Jyoti Sharma

Dissertations

Petroleum processing results in the generation of significant quantities of elemental sulfur (S₈), leading to a surplus of sulfur worldwide. Despite its abundance and low cost, the use of sulfur in value-added organic compound synthesis is limited due to its unpredictable and misunderstood reactivity. This dissertation aims to address this issue by tackling it from two angles. Firstly, by utilizing Density Functional Theory (DFT) calculations, the reactivity of sulfur in the presence of nucleophiles is studied. This facilitates the identification of organic polysulfide intermediates that can be generated under different conditions, as well as the corresponding reactivity for …

On Explainability Of Neural Networks, Cem Benar

Dissertations

It is widely reported that deep neural networks outperform most competitors for a range of applications. The state-of-the-art neural networks have built-in inductive bias of architectural choices, regularizations, optimizer types, and initialization methods. Using inductive bias is intuitive to enhance the model approximation. Deep neural networks are mostly dense and heavily overparameterized. They tend to be biased towards low-rank solutions to reduce complexity and improve generalization performance, known as implicit regularization. The implicit regularization as observed in specific architectures and various real-world data sets suggests to overparameterize neural networks judiciously and learn compressed representations (lower rank approximation) with improved performance. …

Pláticas Liberadoras: Testimonios Of Chicana/O Elders En La Comunidad De San Diego, Gabriel Nunez-Soria

Dissertations

There is robust scholarship inquiring about many facets of critical consciousness (CC), most of which is centered around working with teens, youth, and educators. This study explored development of CC through testimonios of the lived experiences of eight Chicana/o elders in San Diego County. All eight of these elders participated in the Chicana/o movement during the late 1960s and early 1970s and carried these experiences with them into the present moment. Development of CC, the contextualized understandings of historical, social, and systemic aspects of our collective struggle against oppression through dialogue, reflection, and action, is a fundamental aspect of liberatory …

Assessing Threats To Plant Populations: Linking Pollinator Differences To Patterns Of Plant Fitness And Population Genetics, Rieka Yu

Dissertations

Land use change is a major driver of biodiversity loss and consequently has led to the loss of genetic diversity in many plant populations due to declines in population sizes and an increase in spatial isolation. However, not all plant populations respond similarly to land-use change, suggesting there are additional mechanisms mediating plant population genetic patterns. Here, I examine the role of pollinators as this mediating factor. In Chapter 1 I conducted a meta-analysis to investigate how different types of pollinators drive changes in gene flow for plant populations in disturbed habitats, finding that different types of pollinators mediate different …

Role Of Ripk3 In The Pathogenesis Of Tet2 Mutant Hematopoietic Malignancies, Kanak Joshi

Dissertations

Hematopoiesis is dynamically controlled by an epigenetic landscape that regulates gene transcription. Ten-eleven translocation 2 (TET2) is a Fe2+ and α-ketoglutarate (α-KG)-dependent dioxygenase that regulates the transcriptional status of genes associated with hematopoietic stem cell self-renewal and multiple stages of lineage commitment and differentiation. TET2 mutations are commonly detected in almost all types of hematopoietic malignancies, including myeloproliferative disorder, acute myeloid leukemia, and peripheral T-cell lymphomas. In most cases, TET2 is a founder mutation that occurred in hematopoietic stem/progenitor cells (HSPCs). The mutant HSCs undergo clonal expansion and evolution with the accumulation of additional mutations for malignant transformation. Microbial-stimulated inflammatory …

Experiences And Perceptions Of Rural Postpartum Women With Substance Use Disorders Inclusive Of Opioids Regarding Their Care, Debra L. Kramlich

Dissertations

Perinatal opioid use and neonatal withdrawal continue to rise rapidly in the face of the growing epidemic of opioid addiction in the United States, with rural areas more severely impacted. Despite several decades of research and development of practice guidelines, maternal and neonatal outcomes have not improved substantially. This focused ethnography aimed to address that gap by exploring rural women's experiences and perceptions of care to inform development of efficacious, holistic models of care to improve outcomes for these women and their children. Participant observations, oral accounts and formal interviews, and artifact review (i.e., health records, any print and electronic …

‘The Magic Of Flowers’: An Explorative Study Into The Ways Floral Decorations Influence The Experience Of Guests In A Food Setting, In Contemporary Ireland, Johanna Banaditsch

Dissertations

This research project explores the influence of floral decorations on the experience of a diner in a food setting in contemporary Ireland by examining what and how dining experiences are designed, where floral decorations are relevant in this context and how they specifically influence people in these settings.

The research was conducted using the philosophical worldview of interpretivism. In order to answer the five sub-research questions and thus achieve the research aim, the research draws on existing literature on hospitality experiences, literature on the influence of flowers and qualitative primary research conducted through semi-structured in-depth interviews with flower providers and …

Atrial Fibrillation Management In Hispanic Adults, Tania Borja

Dissertations

Background: Research has found atrial fibrillation (AF) to be the primary or a contributing cause of death on 183,321 death certificates, and an underlying cause of death for 26,535 Americans in 2019. Findings indicate an increased AF diagnosis in White people compared to racial and ethnic minorities, contrasting widespread findings of increased prevalence of cardiovascular disease and ischemic strokes in minorities. Significant disparities—by race and socioeconomic status in disease distribution and access to testing and lifesaving treatments—have been documented, specifically associated with social determinants of health (SDOH); i.e., the conditions in which people are born, grow, live, work, and age. …

Exploring The School Nurse's Knowledge, Experiences, And Role In Trauma-Informed Care: Implications For School Nurse Practice, Lesha H. Rouse

Dissertations

School nurses as the only health care professional in schools with the potential to be in daily contact with students are in a critical position to create awareness, influence action, and provide leadership in trauma-informed care (TIC). However, there is a lack of research regarding school nurse TIC knowledge, experiences, and role in school health practice. Research has asserted the pervasiveness of Adverse Childhood Experiences (ACEs) in society as well as, it's potential to cause deleterious life-long health, educational, social, and economic outcomes (Bethell et al., 2017; Felitti et al., 1998; Stevens, 2019). Exploring the school nurse's role in TIC …

Hospice Interdisciplinary Team Processes And Effectiveness, Beth A. Hale

Dissertations

The purpose of this research was to test a causal model of interdisciplinary hospice processes and effectiveness. This research examined the impact of organization and team level structure constructs (organizational culture, team complexity, and team leadership) on hospice interdisciplinary team processes and subsequent influence on perceived team effectiveness. The relationships among perceived team effectiveness, team task satisfaction, and family satisfaction with hospice care were also examined.

The Relationships Between Parenting Stress, Growth, And Development In Infants With Congenital Heart Defects During The First Six Months Of Life, Danica F. Sumpter

Dissertations

The stress experienced by parents at the time of diagnosis and hospitalization for their infant's congenital heart defect (CHD) is well recognized by healthcare professionals. Increased parenting stress has been negatively correlated with development in low birthweight infants. The primary purpose of this study was to explore the parenting stress as experienced by parents of infants with CHD during their first six months of life. In addition, the relationship between parenting stress and the growth and development of infants with CHD was explored. Due to the transactional nature of mother-infant interaction, both directions of this relationship were examined, the factors …

Cumulative Advantage And Student Performance In General Chemistry: An Empirical Study At A Midwest Tier 1 University (2016-2019), Nicole Barvian

Dissertations

General chemistry (GC) plays a crucial role in the academic and career outcomes of students interested in postsecondary science, engineering and medicine. As a whole, chemistry education research literature has reported student attrition rates averaging from 25% to 35% for nearly a century. Student attrition rates can be attributed to a number of factors, including high school preparation (e.g. Tai et al. 2006), opportunity to learn (Carroll, 1989) and accumulated time and practice in a domain (e.g. Ericsson et al. 1993). The factors, in turn, are affected by mechanisms of social stratification, in particular, the social mechanism of cumulative advantage …

Sensing The Rhizosphere: Microbial Transcriptome Responses To Root Exudates And Redox-Active Metabolites, Ankita Bhattacharyya

Dissertations

The term “rhizosphere” describes the dynamic interface between plant roots and soil influenced by root exudates. It is a hotspot of microbial activity, plant-microbe, and microbe-microbe interactions. Distinct variations in bacterial diversity are thought to be driven by plant root exudates. However, the molecular details of these processes still remain unclear.

I addressed this gap by focusing on two strains, Pseudomonas synxantha 2-79 and Burkholderia lata 383, representing diverse groups of Gammaproteobacteria comprised of species with environmental, agricultural, and medical significance. In the first part of this project, we used a combination of metabolomics and RNA-seq to characterize transcriptome responses …

Peruvian Musical Elements In Selected Peruvian Piano Compositions By Duncker Lavalle, Ayarza De Morales, And E. Valcárcel Arze, Gonzalo Aguilar

Dissertations

This research paper focuses on Peruvian musical elements used by three Peruvian composers active in the twentieth century: Luis Duncker Lavalle (1874-1922), Rosa Mercedes Ayarza de Morales (1881-1969), and Edgar Valcárcel Arze (1932-2010). The analysis is centered upon three solo piano works: Duncker’s Leggenda Appassionata (published 1964), Ayarza’s Marinera y Resbalosa (n.d.), and Valcárcel’s Cuatro Piezas Infantiles (1963). These composers represent a cross section, not only chronologically, but also geographically. Relevant Peruvian traditional music (such as mestizo music; Arequipan yaraví; música criolla: marinera, zamacueca; cueca chilena; as well as music of Cuzco and Puno—including from …

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 …

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 …

You Don't Need Eyes To See: The Lived-Experience Of College Graduates Who Are Black Men, Born Into Poverty, And Living With A Visual Impairment, Ronald Dillard

Dissertations

The following study seeks to answer this research question: What is the lived experience of college graduates who are Black men, born into poverty, and living with a visual impairment? The researcher has used intersectionality as an aspect of Critical Race Theory (CRT) to conceptualize the research question and develop an interview protocol.

The researcher has conducted in-depth interviews for this qualitative inquiry, resulting in a narrative study. Purposeful sampling was implemented to identify three participants who fit the criteria of being a Black man, born into poverty, and living with a visual impairment. Data was reorganized to tell the …

Effect Of Exercise Training On Circulating Cancer-Associated Immune Cells In Breast Cancer Patients, Lea Haverbeck Simon

Dissertations

Breast cancer (BC) is one of the leading causes of cancer deaths among females. It is well known that the presence of a tumor decreases robust anticancer immunity via immune-modulation and enhanced immunosuppression through a process called cancer immunoediting. However, it has yet to be determined if exercise-based rehabilitation can elevate the peripheral anticancer immune profile and reduce myeloid-derived suppressor cell (MDSC) mediated immunosuppression. Purpose: To assess the effects of a 12-week prescribed, individualized, supervised exercise-based rehabilitation program on selected circulating immune cells in BC patients at the University of Northern Colorado Cancer Rehabilitation Institute. Methods: 16 female BC patients …

An Exploratory Case Study Of Leadership Practices That Enable International Schools To Become Highly Effective And Learning Progressive Environments, Santha Kumar Sankara Narayanan

Dissertations

Highly effective learning progressive (HELP) environments can prepare students to be future-ready with the needed knowledge and skills to thrive in an ever-changing world. This case study captured the characteristics and measured the effectiveness of an international school working to become a HELP environment using the high-reliability schools (HRS) framework and the leadership practices that enabled them.

This mixed-method study used an explanatory sequential design, beginning with a survey of 122 teachers based on the HRS model (Marzano et al., 2014), where teachers were asked to respond to a series of statements designed to measure the case-study school’s effectiveness and …

Physiological, Ecological, And Microbial Factors Shaping Thermal Tolerance And Performance In Ectothermic Vertebrates, Jason Warren Dallas

Dissertations

Temperature represents a major driving force in biology as it influences essential functions across multiple levels of biological organization. The role of temperature is especially important for ectothermic animals, whose biotic processes are dependent on both body and environmental temperature. Assessing the relationship between temperature and organismal performance represents an important research direction as temperatures continue to warm under anthropogenic climate change. Chapters two and three are focused on a recently colonized population of the invasive Mediterranean House Geckos at the northern edge of their invasion front. These chapters examine the ecological and physiological factors that enable these lizards to …

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 …

A Bayesian Approach To Unit Lindley Mixed Model, Nirajan Bam

Dissertations

In the applied filed of many areas such as Business and Economics, Physical, Biological, Medical, Environmental, and Social Sciences, Psychology, and Educations outcome measurements like rates, proportions, and fractions are common. Researchers have proven that using normal linear regression to analyze the relationship between outcome measurements such as rates and proportions and a set of independent variables can violates key assumptions of the method. Transformation techniques are usually applied to correct the assumptions, but this practice can violate the probability property of bounded nature of outcome variables. Even though beta regression was one of the popular methods to analyze bounded …

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 …

Self-Care, Stress, And School Burnout Among Graduate Students Preparing To Become Mental Health Practitioners, Melissa Rodriquez Estrada

Dissertations

Students in graduate school assume countless responsibilities that range from school-related work to personal commitments (e.g., El-Ghoroury et al., 2012; Myers et al., 2012), resulting in high levels of stress. In addition, those graduate students enrolled in applied psychology programs that focus on working with client populations must navigate clinical and field placement stressors. Dealing with high levels of stress over time paired with ineffective coping strategies can lead to a feeling of burnout. A growing body of research has indicated that appropriate self-care may effectively reduce high levels of stress and burnout (e.g., Kim et al., 2018; Rico & …

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 …

Oikophilia: Relationships Among Life, Human Life, And Place In School Communities And Their Expressions In Curriculum, Mandi Leigh

Dissertations

This naturalistic, non-experimental inquiry explored relationships among life, human life, and place in school communities along with their expressions in school curriculum. I used educational criticism and connoisseurship to richly describe, interpret meaning, evaluate significance, and discern thematics surrounding relationships and how those relationships were expressed in the curriculum. Postmodern ecology provided the framework for acknowledging ecological precarity and performing the critical, as in essential, work of deconstructing what harms life that could be reconstituted as nourishment. The first study question was: What relationships exist among life, human life, and place in school communities? To answer the question, ecological data …