Digital Commons Network^™

Constraining Magmatic Processes In The Central American Arc Using Melt Inclusion Vapor Bubble Analysis And Triple Oxygen Isotope Modeling And Exploration Of Volatile Contributions To The Production Of Continual Radio Frequency (Crf) Lightning Events, John M. Hamilton

Earth and Planetary Sciences ETDs

Magmatic volatiles are key to determining the processes happening in the subsurface that we cannot directly sample. Advances in measuring volatile and isotope contents from erupted volcanic samples have given us the ability to understand magmatic processes, mixing components that produce the bulk magma composition and potentially precursors to eruptive hazards, such as lightning.

Through analysis of melt inclusions that sample the melt at depth and triple oxygen isotope quantification of olivine crystals from multiple volcanic edifices, the three following studies display how I have utilized these analytical techniques to help unravel processes happening in the subsurface that lead volcanic …

Impact Of Third Trimester Alcohol Exposure (Ttae) On Oligodendrocyte Development And Behavior In Mice, Estrella Villicana

Biomedical Sciences ETDs

Prenatal alcohol exposure (PAE) during late gestation can cause cognitive, behavioral, and motor impairments associated with fetal alcohol spectrum disorders (FASDs). The third trimester corresponds to a critical period of brain growth and maturation. This study examined the effects of Third Trimester-equivalent Alcohol Exposure (TTAE) on oligodendrocyte development and adult behavior. Neonatal mice were exposed to ethanol or air vapor from postnatal day (P) 4–8. Immunohistochemical analyses were performed at P8 and P30 to assess myelination, apoptosis, and oligodendrocyte lineage progression. TTAE significantly reduced myelin basic protein (MBP) expression at P8, which was recovered by P30, indicating delayed developmental myelination. …

Design And Optimization Of Epitope Based Malaria Vaccine Targeting Pre-Erythrocytic Stage, Yogesh Nepal

Biomedical Sciences ETDs

Malaria remains a major global health challenge. Currently available vaccines provide only modest and transient protection. In this work, we developed virus like particles (VLPs) based vaccine to target vulnerable epitopes of circumsporozoite protein, a key surface protein of pre-erythrocytic sporozoite stage, across different structural contexts. The immunogenicity of these highly immunogenic vaccines were further enhanced using immune stimulating agents, adjuvants, and the most promising VLP and adjuvant combinations were evaluated in preclinical challenge models to assess efficacy. In parallel, we performed research in an antigen agonistic manner using VLP library immunization that displays different fragments of a target protein …

Post-Fire Flood Modeling In Ruidoso, New Mexico: Improving Burn Scar Runoff Predictions, Pramesh Bhaila

Civil Engineering ETDs

Recent large wildfires in New Mexico have demonstrated severe hydrological driven by vegetation loss and the development of hydrophobic soil surfaces. This thesis evaluates the performance of three infiltration models—Curve Number (CN), Linear Constant (LC), and Green–Ampt (GA)— for the watershed impacted by the 2024 South Fork and Salt Fires near Ruidoso, New Mexico. All three models performed comparably during post‑fire simulations, with strong performance in 2024 and notable degradation in 2025, particularly for the CN. Post-fire analyses indicate substantial reductions in infiltration capacity, with CN increasing by 18–24%, LC initial deficit decreasing by 65–77%, effective hydraulic conductivity reduced by …

Evaluation Of Intracavity Electromagnetic Field Probes And Sources: Implications For Shielding Effectiveness, Joseph Anthony Ferreri

Electrical and Computer Engineering ETDs

To measure the electric field in a reverberant cavity, a small, minimally invasive probe is required. Common solutions include electrically small surface mounted monopole antennas, B-dots, and D-dots. To obtain an accurate field measurement with a particular probe, it is necessary to characterize it to compensate for its ability to convert electric field into voltage which requires a gauge factor known as effective height. The characterization process is straight forward in open space on a ground plane but requires more insight when in situ in a reverberant cavity. This work adapts ground plane probe characterization methods for cavity measurements, facilitating …

Millimeter-Wave Antenna Gain Enhancement Through Stacked Planar Substrates, Zachary Bergstedt

Electrical and Computer Engineering ETDs

This work presents a new wideband millimeter-wave (mmWave) and sub-terahertz antenna design with flexible directivity through the integration of stepped horn antennas and transverse substrate integrated waveguide (SIW) slots for radar and communication applications. The work gives a theoretical and analytical basis for this filter-inspired approach to improving bandwidth and directivity, and presents design and results for a standalone stepped horn, a Ka-band antenna with a solid stepped horn and SIW feed, and W-band antennas with empty SIW feeds and stepped horns manufactured out of multiple planar layers. The realized antennas show bandwidth up to 40% and gain up to …

Alternative Positioning, Navigation, And Timing In Global Navigation Satellite System Denied Environments, Joshua R. Atencio

Electrical and Computer Engineering ETDs

Global Navigation Satellite Systems (GNSS) provide the majority of critical positioning, navigation, and timing (PNT) services for civilian, commercial, and military applications. However, GNSS is vulnerable to service denial from spoofing and jamming from adversaries and environmental obstruction. These vulnerabilities highlight the need for resilient Alternative PNT (APNT) methods. This dissertation investigates APNT frameworks operating in GNSS denied environments. We develop coalition formation and matching theoretic models that allow users APNT services from anchor nodes under resource constraints and in adversarial or emergency conditions. The proposed frameworks optimize positioning accuracy, network utility, and system stability while accounting for geometric dilution …

Calibration Methodology, Diagnostic Performance, And Redesign Of The Current Monitors On The Z Machine At Sandia National Laboratories, Stacie Hernandez

Electrical and Computer Engineering ETDs

A proper evaluation of the current diagnostics fielded in the inner-MITL region of the Z facility in 3D simulation models had not been performed until now. The evaluation of the current monitors has brought insight to their performance in a new view that has led to discoveries. The B-dot probe was the current diagnostic-of-choice since before the refurbishment of the Z facility [1] and until the development of the Inductively Driven Transmission Line (IDTL) current diagnostic [2]. Experimental data has shown that the IDTL can produce cleaner signals and it is more robust than conventional B-dots. Simulation (modeled using COMSOL …

Applications And Comparisons Of Machine Learning Methods In Ultra-Fast Laser Control, Aasma Aslam

Electrical and Computer Engineering ETDs

This dissertation demonstrates the applications and comparative analyses of machine learning methods in ultrafast laser control. By learning the relationship between the system’s input parameters and output pulse characteristics, the performance of a laser can be significantly improved. In this work, the results are presented in two stages by utilizing data from the femtosecond laser system. The first stage concerns two neural networks, named NN1 (fitrnet) and NN2 (feedforwardnet). The second stage, which extended with five different models, namely the linear regression (fitlm), the support vector machine (SVM), the Gaussian process regression (GPR), the boosted tree (fitrensemble), and LASSO (fitrlinear), …

The Formation Of Indian Health Services Within Imperial And Settler-Colonial Contexts, Jillian E. Grisel

American Studies ETDs

This dissertation examines the Indian Health Services as a Cold War biosecurity apparatus, showing how infectious disease was weaponized to dismantle treaty obligations, reorganize tribal lands into “service areas,” and reclassify Indigenous nations as surveilled populations. Against this carceral health economy, Indigenous nations refused. From the 1969 Alcatraz occupation to the 1976 Puyallup takeover of Cushman Indian Hospital, Native activists reclaimed health facilities as sovereign spaces, insisting that care is not a discretionary service but a treaty right grounded in land and kinship. Methodologically, I combine historical-legal analysis of congressional debates, Public Health Service reports, and IHS data with counter-archives …

Brain-Based Mechanisms Of Behavioral Impairment In Fetal Alcohol Spectrum Disorder (Fasd): The Neuroimaging Biomarkers Of Inhibitory Control, Zinia Pervin

Biomedical Engineering ETDs

The developing brain is highly susceptible to alcohol-induced toxicity, often resulting in long-term deficits in executive function and behavioral regulation. Inhibitory control impairments are among the most prominent deficits observed in Fetal Alcohol Spectrum Disorder (FASD). This study investigated the neural mechanisms of inhibitory dysfunction using a multimodal MEG–DTI approach in 67 children aged 6–8 years (34 with FASD, 33 controls) who performed a Go/No-Go task. Source-level MEG analyses revealed reduced stimulus-locked cortical activation in the anterior cingulate cortex and significant group-by-hemisphere interactions in the superior parietal cortex and cuneus. Time–frequency analyses showed diminished response-locked beta power in the sensory-motor …

Benefits Of Advisory & Culturally Responsive Advisory Framework (Craf) Within A Southwestern, Urban, Dual Language Middle School, Mariana Anguelova Castañon

Language, Literacy, and Sociocultural Studies ETDs

In this research report, I examine the benefits of a daily Advisory period at a southwestern, urban, dual-language middle school and explore the impact of the Culturally Responsive Advisory Framework (CRAF), a curriculum I developed as a researcher-practitioner. This work is situated within research on Advisory programs, urban schooling, and dual-language education, while addressing implementation challenges. Grounded in democratic learning theory, CRAF integrates social-emotional learning (SEL), social-cultural learning (SCL), and literacy. To evaluate its impact, I collected qualitative data through anonymous Google Surveys and semi-structured student interviews, supported by quantitative teacher and student surveys. Data were analyzed using open and …

Amplifying Strengths: A Phenomenological Exploration Of Elementary Teachers’ Culturally Proficient Practices With Newcomer Students Through An Appreciative Inquiry Lens, Mary Elizabeth Bradford

Teacher Education, Educational Leadership & Policy ETDs

This qualitative study explored the lived experiences of elementary educators working with newcomer students in a Southwest urban school district, with the purpose of identifying culturally proficient strengths that support student belonging and learning. Guided by an interpretive (hermeneutic) phenomenological approach and informed by Appreciative Inquiry, the study centered educators’ meaning-making rather than deficit-oriented perspectives. Data were collected through in-depth, semi-structured interviews with five elementary educators serving newcomer students across kindergarten through fifth grade. Analysis followed van Manen’s phenomenological methods and resulted in six interrelated themes: belonging before language; school as a cultural system; language as agency and identity; cultural …

Write To Lead: A Document Analysis Of Leadership Communication, Rosenda B. Minella

Teacher Education, Educational Leadership & Policy ETDs

This qualitative study examined how executive leaders at an urban community college in the Southwestern United States used motivating language in written communication. Community colleges face increasing complexity, including enrollment declines, limited resources, and heightened expectations for student success. In this context, written leadership communication helps align organizational goals, build trust, and reinforce institutional values. Motivating Language Theory served as the primary coding framework, with findings interpreted through the lens of Authentic Leadership and informed by AACC Leadership Competencies. Using qualitative document analysis and an AI-assisted workflow to support coding consistency, the study analyzed publicly available executive communications produced over …

The Seeds Of Empire: Endogenous Influences On The Politics Of Bakumatsu And Meiji Era Japan (1853-1912), Benedict M.D. Talley

History ETDs

In this thesis, I argue the roots of Japanese nationalism, exceptionalism, and imperialism long preceded renewed contact with the West following American Commodore Matthew Perry’s historic 1853 expedition. Rather, late Edo Period (1603-1868) and Meiji Era (1868-1912) intellectuals and political figures looked to and were inspired by endogenous forces, ideologies, and intellectual movements of the Edo Period. Through a synthesis of secondary scholarship and analysis of Bakufu and Meiji Era figures’ writing, I seek to uncover the endogenous influences and de-emphasize western influence on the development of late nineteenth and early twentieth century Japanese nationalism and imperialism.

La Raza In The U.S.-Mexico Borderlands: A Comparative Regional Study Of Mexican American Elite Identity-Making From Texan Independence To The Mexican Revolution, Davis Diego Massey

History ETDs

After the U.S. annexed much of Mexico following the Mexican-American War, Mexicans in the incorporated regions began to think of themselves as a racial group within the U.S. rather than a distinctive nationality. The 1848 Treaty of Guadalupe Hidalgo promised citizenship rights to all Mexicans in the area. The Treaty promises rarely were put into practice, as they were left up to the enforcement of territories and states. Even where enforced, the rights of citizenship were restricted and defined on the basis of race. Local laws excluded Afro-Mexicans and Mexican Natives from exercising the rights promised by the Treaty. This …

Nuclear Deterrence: Enhancing The Mission Through Smart Factory Predictive Solutions, Jarrod Matthew Ronquillo

Chemical and Biological Engineering ETDs

To meet the stewardship and modernization initiatives set by the Department of Energy new technologies must enter the manufacturing facilities within the nuclear deterrent complex. Predictive solutions begin with collecting data. An equipment health monitoring device was created to streamline data collection and organization for equipment and processes. A predictive and process performance dashboard was developed for a deionized water system. The dashboard used Western Electric statistical process rules and a machine learning regression algorithm to predict when the resistivity would fall out of specification. Lastly, a remaining useful life calculation was developed for all equipment related to nuclear deterrent …

Assessing Uranyl-Specific Dnazymes And Dna-Aptamers For Uranium Binding In Environmentally Relevant Waters, Ashley R. Apodaca-Sparks

Civil Engineering ETDs

The legacy of uranium mining affects many communities in the western United States, resulting in elevated levels of uranium in surface water. The ability to quickly and accurately detect uranium on site in affected communities can lead to real-time water quality analysis that informs risk assessment and remediation efforts. The objective of this work is to advance the application of biosensing technologies for the measurement of uranium in waters affected by mining legacy. The third chapter of this thesis compares ANDalyze by AlpHa Instruments, a commercially available uranium biosensor, and inductively coupled plasma mass spectrometry (an EPA-verified method for uranium …

Investigating Workforce Development Gaps In Tribal Transportation Agencies, Benson Long Jr

Civil Engineering ETDs

Tribal transportation programs face challenges in recruiting and retaining qualified staff, prompting reliance on external consultants for key responsibilities. This study explores how workforce constraints and organizational structures influence tribal outsourcing decisions. Survey data from 57 tribes informed a logistic regression model examining how geographic isolation, population size, training access, and the presence of a transportation department affect preferences for internal work, actual task completion, and instances where tribes intended to perform tasks in-house but outsourced instead. Findings indicate that outsourcing is driven by limited internal capacity, including staffing shortages, lack of certified personnel, and training opportunities. Geography also plays …

Computational Design Of Peptides And Proteins Through Machine Learning Approaches, Emily J. Hendrix

Chemistry and Chemical Biology ETDs

Advancements in machine learning have emerged as a pivotal tool in computational biochemistry, offering new advancements to address challenges in protein structure and function. However, current machine-learning approaches offer limited insight in understanding protein dynamics. The purpose of this work is to combine traditional physics-based computational tools, such as molecular dynamics and coarse-grained simulations, with recently developed AI-driven computational tools to bridge gaps and advance the understanding of proteins in both structural and dynamic aspects. I investigated several approaches such as (i) traditional physics-based methods to study protein conformation and ensembles; (ii) identifying a peptide inhibitor for the PICK1 PDZ …

Investigating Changes In The Stable Isotopic Composition Of Juniperus Osteosperma Over 34,000 Years Of Climatic Shifts, Lisa S. Garcia

Biology ETDs

Isotopic compositions of plants from the past provides empirical evidence for paleoclimatic shifts and plants physiologically response. This study used Neotoma paleomiddens (fossilized debris piles) collected from Death Valley National Park, which contained preserved abundant plant materials. These middens range from modern to >35,000 years and capture different climatic events in Earth history. Employing Juniperus osteosperma (Utah Juniper) leaves found in middens, I investigated variation in carbon and nitrogen stable isotopic composition. To help interpret paleomidden results, we used modern field and herbaria samples of Juniperus from a spatial gradient stretching across their geographic range. Results showed δ ¹³C …

Reassembling Riparian Ecosystems: Stream Restoration Effects On Vegetation, Arthropods, And Aquatic-Terrestrial Connectivity, Katelyn P. Driscoll

Biology ETDs

Riparian areas exist at the aquatic-terrestrial interface and provide disproportionate ecosystem services, yet multiple stressors have degraded these zones globally. Stream restoration seeks to reverse degradation, but rigorous evaluation of treatment effectiveness remains limited. I conducted a before-after-control-impact (BACI) study in the southern Rocky Mountains to evaluate two stream restoration treatments—beaver dam analogs (BDAs) and plug-and-ponds (P&Ps)—across three dimensions of riparian ecosystem response. Using Bayesian analysis, I quantified treatment effects on functional diversity and composition of riparian plant communities. Using generalized linear mixed models, I evaluated restoration effects on riparian arthropod abundance, richness and guild composition across lateral gradients and …

Assessing The Impact Of Multi-Physics Effects On Photovoltaic Module Degradation Using Computational Modeling, James Yuan Hartley

Mechanical Engineering ETDs

This dissertation describes research to develop and apply multi-physics simulation capabilities using finite element methods to analyze photovoltaic module damage mechanisms. Analyses of full-scale solar modules under mechanical load are presented, including experimental validation against measurements of external deflection and internal strain. Module damage by solar cell breakage and interconnection fatigue are discussed, and the applicability of simplifying analyses using mathematical plate theory is assessed. Detailed sub-module component models undergoing thermal-mechanical stressors are also presented, to identify the design features and materials most influential to stress generation and to assess the representativeness of using sub-module assemblies in accelerated testing. Finally, …

Al-Manfiyun Exiliados: Voices Of The Lebanese Diaspora In Mexican Literature, Mia Del Rosario

Spanish and Portuguese ETDs

This thesis explores two key works of Mexican literature published in the late 20^th century in terms of their cultural relevance in the Mexican literary sphere. The novels En el verano, la tierra by Carlos Martínez Assad and Las hojas muertas by Bárbara Jacobs center around the infrequently-explored identities of Lebanese immigrants to Mexico and their Mexican-born descendants through a sociocultural lens, discussing their identity negotiation in the context of 20^th-century Mexico, which was in the process of redefining its national identity after the Mexican Revolution. During this time, people of ethnicities that did not fall into …

A Constructional Approach To Multimodal Linguistic Analysis, Fredy A. Mendieta Rodriguez

Spanish and Portuguese ETDs

This dissertation investigates the systematic organization of co‑speech gestures in referential communication, using data from Spanish‑speaking monolinguals and Spanish–English bilinguals. While traditional gesture research treats pointing as a universal phenomenon, the current analyses show that gestural productions display internal phonological patterning and context‑conditioned variability that parallels spoken constructions. Quantitative results demonstrate how referential distance and communicative context (find‑it versus misunderstanding situations) shape the selection of embodied phonological features—handshape, orientation, movement, and beats—revealing consistent associations between form and interactional demands. Qualitative analyses trace how gestural realizations reduce across discourse as shared understanding emerges. A new complexity metric, based on token frequency …

Corazones Urbanos: Literary Cartographies And Southwest Cities In The Mexican American Spatial Imaginary, Jorge A. Hernández Jr.

Spanish and Portuguese ETDs

Corazones Urbanos: Literary Cartographies and Southwest Cities in the Mexican American Spatial Imaginary examines how Mexican American writers from Tucson, San Antonio, and Albuquerque narrate, critique, and reimagine urban space across the U.S. Southwest in the twentieth century. Integrating literary studies, cultural geography, urban history, and critical regionalism, the project analyzes responses to racialized development, urban renewal, and gentrification that have displaced Mexican American communities from historic downtowns. Moving beyond borderlands and transnational models, it advances a critically regional approach attentive to local histories, municipal policies, and community pressures shaping urban life. Through close readings of creative and nonfiction texts …

Design, Fabrication, And Characterization Of Silicon Nitride Microresonator Optical Frequency Combs, Lala Rukh

Optical Science and Engineering ETDs

Optical frequency combs consist of equidistant optical frequencies and have numerous applications ranging from optical metrology to medical diagnostics. Initially, frequency combs were based on bulky mode-locked lasers, but advancements in integrated photonics enabled the generation of frequency combs in chip-scale resonators (microcombs) using Kerr nonlinearity. These miniaturized systems present various challenges, including increased propagation losses, enhanced thermal effects, and the extension of microcombs to visible wavelengths. In this dissertation, I will focus on addressing these challenges in silicon nitride (SiN) resonators. First, this thesis focuses on the fabrication of high-Q SiN resonators and the impact of fabrication parameters on …

A Quantum Phase Space Description Of Local Noise In Atomic Ensembles, Andrew Kolmer Forbes

Physics & Astronomy ETDs

Nonclassicality in quantum sensors can improve sensitivity, but often increases susceptibility to noise. Thus, modeling physically relevant noise sources and analyzing their effect on quantum metrology are both of importance to the field of quantum sensing. In this dissertation, I demonstrate that local noise sources, which are present in almost all many-spin systems, can be tractably modeled when assuming permutation symmetry of the noise, and we show that many common local noise sources can be mapped to a Fokker-Planck equation on quantum phase space. We apply this description of noise to study quantum sensing using noisy probe states and establish …

Optical Nuclear Spin Detection In Diamond And Varifocal Metasurface Optics, Maxwell D. Aiello

Physics & Astronomy ETDs

This dissertation presents two experimental investigations at the intersection of quantum sensing and precision optical instrumentation. The primary project demonstrates optically detected nuclear magnetic resonance (NMR) of ¹³C nuclear spins in diamond, using state-selective Landau-Zener transitions under microwave frequency sweeping to bidirectionally transfer spin polarization between nitrogen-vacancy (NV) electron spins and remote ¹³C nuclear spins. This enables optical polarization and readout of large ensembles of polarized nuclear spins at low magnetic fields and room temperature, with spin dephasing times limited by longitudinal relaxation of nearby NV electron spins. The secondary project reports the design, fabrication, and characterization of …

Realizing The Long Wavelength Array Swarm, Craig Anthony Taylor

Physics & Astronomy ETDs

Sensitive modern radio interferometers are costly to build and operate at the university level. The `swarm telescope' concept addresses this challenge by enabling the collaborative use of individual telescope systems, overseen by separate institutions, that come together to form a more powerful and manageable facility. This dissertation focuses on demonstrating this concept using the Long Wavelength Array (LWA) by commissioning an aperture synthesis telescope consisting of interconnected LWA stations, called the LWA Swarm. The presented work details building a cost-efficient prototype LWA platform -- the LWA--North Arm station -- to enable synthesis imaging using the 3-element interferometer comprised of LWA1, …