Digital Commons Network^™

Understanding Mental Health Awareness And Knowledge Of Flight Instructors, Eric Michael Buteau

Theses and Dissertations

Mental health has become an increasing concern in the aviation industry, with pilots often withholding health information for fear of losing their medical certification. Certified Flight Instructors (CFIs), who interact closely with students, are in a unique position to recognize and address mental health crises but lack sufficient training in this area. This study examines CFIs' awareness, knowledge, comfort, and willingness to engage with mental health issues in aviation. A survey was distributed to CFIs at a large aviation university. Survey results revealed no significant correlation between years of experience and knowledge or comfort with mental health topics. However, a …

Experimental Investigation Of Freezing Microdroplets For Understanding Chain Crystal Aggregates Observed In Atmospheric Clouds, Imteaz Osmani

Theses and Dissertations

Ice crystal aggregates are observed in upper stratospheric clouds. The crystal aggregates can form in different orientations, geometry, and shapes which are not well studied. These crystal aggregations are found in the clouds as crystal chains of various lengths and cause damage to hypersonic vehicles which include missiles, re-entry vehicles, and jet aircraft. The reasons behind such damage by atmospheric crystal chains to hypersonic bodies are unknown. That is why studying these ice crystals and their behavior in the hypersonic environment is necessary. Ice crystals form in the atmosphere in two different ways which are homogenous and heterogenous. Heterogenous freezing …

Targeting World Language Learning In The Target Language: A Qualitative Inquiry Of The K–12 Foreign Language Teacher Experience, Igor Ljevaja

Theses and Dissertations

This qualitative study explores the current practices of K–12 foreign language teachers (FLTs) in using the target language (TL) within an urban school district in the Midwest United States. Focusing on how FLTs engage in professional development (PD) to optimize their TL use in the classroom, the study investigates the strategies and knowledge FLTs employ to foster TL proficiency among students. Purposeful sampling was employed to recruit participants (n = 5) who represented full-time FLTs, taught between sixth and 12th grade, and had at least four years of teaching experience and valid state licenses. Semi-structured interviews with current FLTs provide …

Using Problematic Sexual Behaviors And The Developmental Life Course Model To Predict Criminal Justice Involvement And Psychopathology By Early Adulthood, Amanda Schwartz

Theses and Dissertations

The developmental life course (DLC) model explains risk factors and developmental patterns among juveniles who have committed more than one sexual offense by considering the impact of major life events, experiences, and risk and protective factors throughout various developmental stages. Using an archival longitudinal dataset, the Longitudinal Studies of Child Abuse and Neglect (LONGSCAN), this study applied the DLC model to explore the relationship between gender and onset and persistence of problematic sexual behaviors (PSBs) in childhood and adolescence with criminal justice involvement and psychopathology by early adulthood (N = 330, 46% male, M = 18.26 years) after controlling for …

Behavioral Health Workforce Modeling To Assist In Prioritizing Educational Pathways Programs In North Dakota, Mandi-Leigh Peterson

Theses and Dissertations

Background. The need for behavioral health services in North Dakota has grown in recent years. As part of the response to the need for services, a state definition of behavioral health workforce was enacted in state statute to assist in addressing this need. Thus far, no empirical evaluations of the status of that workforce have been conducted.Purpose. The primary purpose of this work was to quantify the supply and demand for the behavioral health workforce in North Dakota to assist in identifying and prioritizing those educational pathways that can assist in growing the identified needed workforce. Sample. This study examined …

The Fcc 5-Year Deorbit Rule’S Impact On The Space Industry Including Non-Traditional Scientific And Environmental Stakeholders, Kristin Shahady

Theses and Dissertations

In pursuit of a safer and more sustainable space environment, the Federal Communications Commission (FCC) introduced the 5-year deorbit rule, a regulatory mandate aimed at mitigating space debris by requiring satellite operators to remove their spacecraft from LEO within 5 years after their mission is complete. While the intent behind this rule is admirable in the desire to remediate and limit the generation of orbital debris, it raises questions whether it was crafted with consideration of all stakeholders, whether it will truly mitigate the creation of orbital debris, and whether it exhibits characteristics of arbitrariness and capriciousness. Agencies’ actions be …

Parp1 Modulates Gata3-Mediated Gene Regulation In Breast Cancer, Mikhala Cooper

Theses and Dissertations

In eukaryotic cells, chromatin acts as a physical barrier for many transcription factors, preventing them from efficiently binding to their recognition sequences within the nucleosome. Pioneer factors are a class of transcription factors that bind to nucleosomes and activate silent chromatin. Pioneer factors are frequently involved in various immune cell pathways, tissue development, and homeostasis, thereby underscoring their important roles in development and disease. Previous research found that pioneer factors have at least three fundamental properties: 1) they can interact with their cognate recognition sequences before transcription activation, 2) they can increase local chromatin accessibility, and 3) they have integral …

An Indigenous Approach To Professional Development Program Evaluation For Pk–12 Educators, Erica Marie Denault

Theses and Dissertations

In this study, I address the critical need for Indigenous approaches to program evaluation with an emphasis on cultural professional development (PD) programming.

I choose an Indigenous approach to program evaluation via the American Indian Higher Education Consortium (AIHEC) Indigenous Evaluation (IE) Framework that I modified to include educational and academic terminology to develop a cultural evaluation tool: the Cultural Competency Checklist. The Cultural Competency Checklist was embedded within cultural PD program design to illustrate a cultural learning process to produce IE. The Cultural Competency Checklist, utilized as a cultural evaluation tool shifts and reframes the westernized program evaluation process …

The Impacts Of Using Geogebra On Students’ Perceptions And Achievement In Learning Trigonometric Ratios, Robert Carlos Trejo

Theses and Dissertations

GeoGebra, a dynamic mathematics software, was used to study high school students’ perceptions and achievements in learning trigonometric ratios. The study addresses a critical gap in the literature concerning the use of GeoGebra for understanding trigonometric concepts, particularly in fostering conceptual clarity and problem-solving skills. Rooted in a constructivist pedagogical framework, the research examines how GeoGebra facilitates interactive and exploratory learning environments that encourage active student engagement and deeper comprehension of trigonometric ratio principles.

The study employed a quantitative approach to evaluate the efficacy of GeoGebra. Quantitative data focused on student achievement in solving trigonometric ratio problems through pre- and …

How Many Tiny Snails? Circumscription Of Three Species Of Pyrgulopsis (Mollusca: Gastropoda: Hydrobiidae)In Nevada Mountain Springs, Trenton Meadows

Theses and Dissertations

The springsnail genus Pyrgulopsis is one of the most diverse groups of freshwater gastropods in North America (Hershler, 2014), with many species displaying high levels of endemism (Hurt, 2003). This study attempts to circumscribe three putative species of springsnails: Pyrgulopsis serrata, Pyrgulopsis marcida, and a newly identified clade, referred to as Lineage C, from the Ruby Lake National Wildlife Refuge, Nevada, USA and nearby springs. Using an integrative taxonomic approach, we combined morphological, anatomical, and molecular data to examine species boundaries and evolutionary relationships.

Many lines of evidence were considered to determine species boundaries. Phylogenetic analysis of the mitochondrial …

Density Functional Theory And Machine Learning Analysis Of C—C Reductive Coupling From Terminal Cyanido And Cyaphido Complexes, Roberto Magdiel Escobar

Theses and Dissertations

Carbon–carbon (C–C) bond activation has gained increased attention as a direct method for the synthesis of pharmaceuticals and industrial chemistry. Due to the thermodynamic stability and kinetic inaccessibility of the C–C bonds, however, activation of C–C bonds by homogeneous transition-metal catalysts under mild homogeneous conditions is still a challenge. Most of the systems in which the activation occurs either have aromatization or relief of ring strain as the primary driving force. The activation of unstrained C–C bonds of phosphaalkynes does not have this advantage. This study employs Density Functional Theory (DFT) calculations using the Gaussian16 package to elucidate and compare …

Primary And Secondary Resonances Of Fringe Effect Electrostatically Actuated Mems Cantilever Resonators, Miguel Armando Martinez

Theses and Dissertations

The nonlinear dynamics of micro-electromechanical system (MEMS) cantilever resonators actuated by the fringe field at parametric and primary resonances are studied. Three models are used based on different descriptions of the system capacitance. In the fringe and capacitance models, the electrostatic force due to the parallel-plate capacitance is neglected due to a hole in the ground plate (removes overlapping area). The SolidWorks model is based on numerical capacitance simulations performed on SolidWorks using EMS. All three models that approximate the fringe field capacitance are compared with one another. The Method of Multiple Scales (MMS) and Reduced Order Model (ROM) up …

The Effects Of Livestock On Mosquito Diversity And Abundance In Hidalgo County, Taylor Nicole Moya

Theses and Dissertations

Mosquitoes are detrimental to animals and threaten humans. More information is needed on how farm animal presence may impact mosquito abundance and diversity at farms. My goal in this study is to determine if there is any correlation between animal abundance or diversity on a farm and the abundance and diversity of mosquitoes collected. Hidalgo County, Texas, has a subtropical desert climate, ideal for mosquitoes. I hypothesized that the mosquito abundance and diversity indices would increase as the livestock abundance or diversity increases. Adult mosquitoes were collected using two CO2-baited light traps per farm from Spring 2022 to Fall 2022. …

Structure Modifications And Alternative Monitoring Designs Of Wildlife Road Mitigation Structures, Madison T. Nadler

Theses and Dissertations

Wildlife mitigation structures are designed to keep animals off roadways while providing them safe passage to the other side and not impeding traffic flow. Camera traps are commonly used to assess the success of these mitigation structures, but there are downfalls to both the methods and structures. Alternative mitigation structure designs are needed to better prevent wildlife from accessing roadways in areas where they should be deterred. Additionally, traditional camera trapping methods do not accurately capture the full wildlife communities that may be utilizing these structures and other survey methods are needed, specifically aimed at small mammals, amphibians, and reptiles. …

Implementing Organic Fertilization Practices To Improve Aloe Vera Growth And Soil Health In The Lower Rio Grande Valley, Isaiah Edward Jaramillo

Theses and Dissertations

Aloe vera (L.) (Aloe) Burm. f., is valued for its applications across the cosmetic, medicinal, and food industries due to its leaf gel. In the aloe industry, the extraction of gel from leaves generates significant quantities of organic waste, which presents an opportunity to repurpose this material as an amendment in aloe cultivation. While Aloe is renowned for its resilience, understanding the feasibility of using these organic shavings as a soil fertility amendment in aloe production is critical. This research aims to identify sustainable fertilization methods for Aloe that can maintain and/or improve crop yield while enhancing soil health. This …

Theoretical Insights And Analysis Into Luneburg Lens, Aram Flores

Theses and Dissertations

Advancements in wireless communications necessitate innovative antenna designs for radar systems and satellite communications. The Luneburg lens, theorized by Rudolf Luneburg in 1944, is a gradient-index lens capable of focusing electromagnetic waves onto a point on its surface, offering potential improvements in antenna gain and performance. Access to the lenses, courtesy of Assured Space Access Incorporated, enabled me to research the lenses response, and specific design details remain confidential. Practical assessments of 3D-printed Luneburg lenses of varying sizes are limited, including factors such as lens alignment and focal point offset. This study investigates the performance of 6-inch and 13.25-inch Luneburg …

Online Learning Communities And Secondary Educators' Tech-Enhanced Instructional Practices: A Correlational Study, Oscar R. Carrera

Theses and Dissertations

This correlational study investigated how secondary educators' engagement in online learning communities relates to their tech-enhanced instructional practices, a relationship that gained importance following the COVID-19 pandemic's acceleration of educational technology adoption. Through the lens of Keller's ARCS Model of Motivation (Keller, 1987) and demographic analysis, the research examined three key aspects: the relationship between community engagement and tech-enhanced instructional practices, demographic predictors of engagement, and correlations between ARCS motivational components and engagement. Data collected through a cross-sectional survey of 115 secondary educators revealed a statistically significant moderate positive correlation between engagement in online learning communities and tech-enhanced instructional practices. …

Enhancing Educator Technology Skills In The Digital Age: A Comparative Analysis Of Video And Screenshot Microlesson Professional Development, Brittni Knebel Kalich

Theses and Dissertations

This study examined video and screenshot microlesson formats as a technology professional development for enhancing educators’ technology skills. As educators face increasing demands for technology proficiency in the twenty-first century classroom, this study was conducted to help address a need for further investigation into whether screenshot or video microlessons can serve as effective PD tools for teachers (Bowman, Vongkulluksn, Jiang, and Xie, 2020). Using a comparative design, this study evaluated three groups: one receiving video microlessons, another receiving screenshot-based microlessons, and a control group receiving no lesson. Data were collected through post test scores (multiple choice questions), a Likert-scale survey, …

Examining Hispanic Beginning Farmers And Ranchers In The Rio Grande Valley Through A Community Capitals Framework, Perla Kimberly Schrock

Theses and Dissertations

While existing literature addresses the experiences of beginning farmers and ranchers (BFR), there is a notable gap in research focused on Hispanic beginning farmers and ranchers (HBFR). This study aimed at exploring the unique experiences of HBFR in a predominantly Hispanic region, the Rio Grande Valley (RGV), employed the Community Capitals Framework (Flora et al., 2016). I conducted 16 semi-structured interviews with HBFR and local nonprofit organizations and federal employees, complemented by participant observations. Through thematic and content analysis of the interview transcripts, findings revealed valuable insights into the livelihoods of HBFR. Despite HBFR facing significant challenges, this study demonstrated …

Leveraging A Community Of Practice To Advance Stem Education Reform And Promote Teacher And Student Self-Efficacy, Ruth Renee Colyer

Theses and Dissertations

This dissertation examined the impact of the CREST-MECIS community of practice on K-12 STEM teachers and undergraduate and graduate students, addressing the urgent need for innovative approaches in science education to meet the challenges of the 21st century. The study was grounded in response to three primary problem statements: 1) the significant learning losses and socio-emotional challenges stemming from the COVID-19 pandemic, 2) the inadequacy of traditional instructional methods in post-pandemic classrooms, and 3) the need for culturally relevant and inclusive teaching practices that acknowledge students’ lived experiences. Data were collected through pre- and post-interviews, survey analyses, and qualitative feedback …

Community Reintegration Of Previously Incarcerated Individuals From A Virtue Perspective, Cindy Noemi Hernandez

Theses and Dissertations

Community reintegration is one of the most important indicators that determine the success of previously incarcerated individuals’ rehabilitation. It is influenced by several factors such as support, attitudes, strengths, and virtues. One emerging area of study that can be related to community reintegration is virtue. The concept of virtue has received increasing attention in rehabilitation research, focused on how one’s virtuous pursuit of excellence improves well-being and adaptation (Kim et al., 2016). In that community reintegration is a type of life adjustment, virtue can be related to community reintegration. The present study examined community reintegration and perceived support of previously …

The Role Of Hope In Recovery From Sexual Assault For Hispanic Women, Esmeralda Rivera

Theses and Dissertations

Despite a growing amount of academic literature, there is a lack of research examining the levels of hope in Hispanic women recovering from sexual assault trauma. This quantitative survey investigates hope in Hispanic women healing from sexual assault trauma. The Miller Hope Scale (MHS) examines the variations and correlations between degrees of hope and demographic, personal, and self-advocacy factors. The research employs the Trauma Symptom Checklist—40 to investigate the correlation between levels of hope and trauma among women who have undergone sexual assault. Ninety-one Hispanic women from a crisis center in the U.S. were recruited for the study. Descriptive statistics, …

Resonances Of Electrostatically Actuated Non-Uniform Mems Cantilever Resonator Of Constant Width And Linearly Varying Thickness, Rigoberto Flores

Theses and Dissertations

In this investigation the behavior of an electrostatically actuated non-uniform microelectromechanical (MEMS) cantilever resonator of constant width and linearly varying thickness is investigated. The cantilever resonator vibrates using soft AC voltage at near half the first natural frequency of the cantilever and near the first natural frequency of the cantilever, known as primary and parametric resonances, respectively. Bifurcation diagrams for the amplitude-frequency and amplitude-voltage response are obtained for both resonances. Two methods are used in this investigation, namely the Method of Multiple Scales (MMS) and Reduced Order Model (ROM) using up to 6 modes of vibration.

These methods are used …

End-To-End Learning For A Low-Cost Robotics Arm, Abhishek Chothani

Theses and Dissertations

Robotic manipulation is a cornerstone of automation, with the ultimate goal of developing versatile systems capable of executing a wide range of real-world tasks autonomously. Traditional robotics approaches, while reliable and widely adopted in industrial settings, often struggle with adaptability, perception, and dynamic task execution. This thesis explores the evolution from classical robotics techniques to modern learning-based approaches, leveraging advancements in artificial intelligence to overcome these limitations.

Initially, the thesis presents a pick-and-place pipeline built using the Drake robotics framework and the KUKA iiwa robotic arm. This system employs a pseudoinverse controller for inverse kinematics to perform structured tasks like …

Fabrication And Performance Of Scalable Bio-Engineered Porous Layers For Efficient Co2 Capture, Mary Sharon Rose Bondugula

Theses and Dissertations

This dissertation addresses the critical challenge of mitigating climate change by advancing CO2 capture technologies. As global CO2 emissions continue to rise, effective methods for capturing and separating CO2 from industrial processes are essential to combat climate change. Existing CO2 capture systems, such as Pressure Swing Adsorption (PSA) and Temperature Swing Adsorption (TSA), often rely on packed bed designs that face limitations, including poor heat and mass transfer, slow gas diffusion, and low thermal conductivity, reducing their efficiency. To overcome these challenges, this dissertation explores innovative solutions by developing advanced adsorbent coatings and scalable bed configurations.

This research begins by …

The Lasting Psychological Effects Of Juvenile Arrests, Nadia Olivia Bortolin

Theses and Dissertations

This research investigated the enduring psychological consequences, specifically depression and anxiety, stemming from juvenile arrests and their influence on adulthood. Literature has demonstrated impacts on juvenile arrests from cultural, socioeconomic, family dynamics, and environmental elements. This study addresses a notable gap in understanding the long-term impact on mental health and employment. Research indicates a sensitivity to outcomes based on the age of arrest, with early adolescent arrests having profound effects on development and an increased likelihood of subsequent criminal activities. Developmental and risk factors, such as socioeconomic challenges and pubescent difficulties, contribute to persistent delinquent behaviors into adulthood. Some studies …

Malicious Compliance: Examining Revenge Behaviors In Organizations, Patricia Jewel Emily Morrison

Theses and Dissertations

Revenge is a multifaceted behavior that manifests in various forms. The purpose of this dissertation was to examine a particular form of revenge known as malicious compliance, which has yet to be sufficiently researched. A two-study approach was used to examine malicious compliance. In the first study, qualitative data was collected from an online forum for sharing malicious compliance experiences. In the second study, 352 participants completed a mixed-methods survey online. Data from both studies was analyzed in RStudio and MAXQDA. Study 1 utilized unsupervised machine learning techniques, non-machine learning techniques, and thematic coding techniques to analyze the forum dataset. …

Loss Of Control In General Aviation: An Investigation Into The Mooney M20 And The Full Trimming Tail Design, Trenton Neil Wright

Theses and Dissertations

Loss of Control (LOC) in General Aviation (GA) remains one of the leading causes of aviation accidents, with 94% of all accidents in 2022 occurring in this sector, and 42% attributed directly to LOC [2][3]. This thesis focuses on the Full Trimming Tail (FTT) in Mooney aircraft, hypothesizing that the FTT design significantly increases the likelihood of LOC, particularly during go-arounds and touch-and-go landings. Prior studies have shown that certain trim systems can amplify pitch-up moments following rapid configuration changes, leading to stalls or LOC if not adequately managed by the pilot [23][24][25].

This research utilized a combination of logistic …

The Design And Implementation Of A Modular Tissue Engineering Test Bed To Pursue An Alternate Pathway Of Cell Culture Based Research, Ryley Patrick Griffin

Theses and Dissertations

The development of a Modular Automated Tissue Engineering Test Bed (MATETB) is the next step in the development of cheap and easily available in vitro cell regulatory systems for both academic and industrial purposes. This project outlined the framework and requirements for a device that could automatically regulate and collect data on a cell culture through the manipulation of its liquid environment. From this framework, a prototype was built. The device would fulfill cell culture needs while collecting data automatically and allowing for live viewing and imaging of cells. The device was comprised of a mechanical skeleton (MS), an environmental …

Mitigating Code Reuse Attacks On Risc-V Binaries: Minimizing Gadget Availability Using The Compressed Extension, Heitor Vieira

Theses and Dissertations

Embedded systems are vital in civilian and military applications, requiring high performance and security. The open RISC-V Instruction Set Architecture (ISA) offers significant advantages, including security through community review and strategic independence in microchip supplies. Brazil’s recent partnership with RISC-V highlights its potential for national technological sovereignty. However, RISC-V is not inherently resistant to code reuse attacks (CRAs), highlighting the need to integrate security measures early in development. The RISC-V Compressed extension, while beneficial for optimizing performance and code flexibility, introduces security trade-offs. As RISC-V adoption grows, particularly in critical systems, addressing these security challenges from the start is crucial …