Digital Commons Network^™

Sub-Stage Climatic Shifts During Mis 11 Refined From Diatom Assemblage Reconstruction In The Valles Caldera, New Mexico, Savannah Cutler

Earth and Planetary Sciences ETDs

Diatom assemblage reconstruction from the Valles Caldera sediment core (VC-3) was utilized to infer climatic and aquatic changes during a 50-thousand-year [ka] period in the Mid-Pleistocene (435-385 ka). This 50 ka interval spans most of Marine Isotope Stage 11 (MIS 11) – one of the most prominent interglacials of the past 500 ka – and is widely considered an analog for the Holocene and future climate regimes. Nearly all records from MIS 11 are either marine or ice-core based, making VC-3 unique among lacustrine sediment records as it captures insolation variations and climatic changes during the mid-Pleistocene. Analysis of the …

Sustaining Principals In Native Serving Schools, Marsha Hubbell-Espinosa

Teacher Education, Educational Leadership & Policy ETDs

Rural schools struggle to recruit and sustain quality educational leaders and systems that contribute to student success. Rural Native American schools pose more of a challenge because of the unique cultures that play a role in sustaining leaders in their communities. I explored the reasons for high principal turnover in rural Native American serving schools. I conducted a qualitative study using semi-structured interviews to collect narratives related to turnover from eight current, former, and retired principals. The stories of these principals provide a direction for recommendations for approach, strategy, and fundamental culturally responsive leadership that is unique to rural Native …

Oral Health Education And Dental Care Access Of Families Of Children With Down Syndrome In New Mexico, Alayna Marissa Holcomb

Dental Hygiene ETDs

ABSTRACT

Purpose: The purpose of this study was to assess the oral health education and dental care access of families of children with Down syndrome in New Mexico.

Methods: The data were gathered from a survey available to members of the Rio Grande Down Syndrome Network for 14 days containing 13 questions.

Results: The most reported age range for the individuals in care were 0-14 years at 41.6%. Most individuals with Down syndrome receive dental services every six months (62.5%) at a regular dental office (54.2%). Caregivers reported the individuals are taking 1-2 prescription medications (54.2%) and not aware of …

Muertos Made In México: Necrocapitalismo En La Cultura Mexicana, Luis A. Gamboa

Spanish and Portuguese ETDs

Muertos Made in México: Necrocapitalismo en la cultura mexicana examina textos de la literatura mexicana desde 1810 hasta la actualidad, junto con estudios cinematográficos, para explorar los contextos históricos y culturales que han contribuido al surgimiento de la violencia en México como fenómeno social. Asimismo, siguiendo la teoría de la necropolítica (2019) de Joseph-Achille Mbembe (1967), se analizan el realismo-gore y la doctrina neoliberal en México (1980-presente) que impulsan la deshumanización y cosificación de colectivos marginados y la trata de personas en el mercado global. Muertos Made in México propone que en una sociedad caracterizada por la muerte y la …

Women Doctoral Students In Computer Science: Nevertheless, They Persist, Shannon L. Mccoy-Hayes Edd

Teacher Education, Educational Leadership & Policy ETDs

Throughout millennia systemic restrictions have prevented women from full participation in science. Even now, with science ubiquitous to life as we know it, double standards impact women’s access and equal participation in STEM. Computer science (CS) is one STEM field where women remain significantly underrepresented in both academia and the workforce, yet despite decades worth of semi-annual reporting, there is still no consensus as to why. A survey was deployed to twenty-nine institutions inviting women doctoral students in CS to participate in personal interviews. Six women from different institutions at different stages of their programs responded. Qualitative interviews using phenomenological …

On The Limitations And Restrictions Of The Hardy-Littlewood Circle Method, Daniel W. Havens

Mathematics & Statistics ETDs

We discuss herein the history, layout, and philosophy of the Hardy-Littlewood Circle method, as well as the more modern renditions thereof. The limitations and scope of each method presented is discussed in detail, providing examples of cases where the failure of the circle method is of relevance. We include a summary of famous problems which have been resolved using each methodology, as well as what limitations each methodology showcases.

Agroecology And Soil Stewardship: Values And Techniques Of Smallholder Farmers In Bernalillo County, Stephanie Olivas

Geography ETDs

Agrarian movements around the world use agroecology to build sovereignty and steward dynamic ecosystems. Research has shown that agroecological farmers steward more resilient crops, more resilient soil biomes, and greater biodiversity than conventional agriculture. GIS and remote sensing offer many tools to detect the impacts of these farmers on the environment, but it is less clear how such technologies fit into agroecological goals. This study asks: what values, experiences and knowledge do smallholder producers in Bernalillo County embody in their soil stewardship practices? Also, what experience or knowledge do smallholder producers in Bernalillo County have about remote sensing, and would …

Molecular Dynamics Insights Into The Structural Behavior And Interactions Of Complex Biological Systems, Shenghan Song

Chemistry and Chemical Biology ETDs

All-atom molecular dynamics (MD) simulations are essential for examining the structural and dynamic aspects of proteins at high resolution, complementing experiments limited by resolution, size, and complexity. Advancements in algorithms and hardware have enhanced the role of computational tools in scientific research, allowing for more accurate simulations of proteins with standard residues. However, simulating real biological systems, which include non-standard residues such as lipid membranes, remains challenging despite the assistance of tools like CHARMM-GUI. My research initially focused on simulating the PICK1 BAR dimer using steered MD simulations to investigate its structure and dynamics. Simulation works expanded to include systems …

Insight Into The Application Of Engineered Phenol Polymer Nanocomposites For Geothermal Well Applications To Modify Fracture Permeability, Fatemeh Hamidi

Civil Engineering ETDs

In enhanced geothermal systems, the efficient transfer of heat from the formation to the fluid circulating through the fracture network can be compromised when thermal short-circuiting occurs due to preferential flow through highly conductive fractures. This study introduces a pioneering approach using newly developed phenol polymer nanocomposites as an engineering solution to address the challenges associated with preferential flow in geothermal wells, which can lead to thermal short-circuiting. Multiple phenol polymer nanocomposites were formulated, incorporating aluminum oxide, COOH-functionalized graphitized multi-walled carbon nanotubes (MWCNTs), and graphene nanoparticles, each with a 0.5 wt.% polymer dosage. This research successfully modified the crosslinking process …

Optimizing Flash Flood Prediction In Arid And Semi-Arid Regions: A Comparative Evaluation Of Infiltration Models And Parameter Estimation Guidance Across Spatial Scales, Sara Rassa

Civil Engineering ETDs

This study improves flash flood prediction by analyzing the vital role of infiltration models in hydrologic modeling, especially for areas with scarce data. It offers new parameter estimation guidance for three infiltration models—initial-constant (IC), linear-constant (LC), and Green-Ampt (GA)—based on plot-scale rainfall simulations. The research emphasizes the impact of soil texture, moisture, and crust on model parameters. A comparative analysis of four models (curve-number, IC, GA, and LC) using data from Arizona's Walnut Gulch Experimental Watershed under different calibration scenarios shows the GA model's superiority in certain conditions, though it faces issues of equifinality in unconstrained calibrations. Meanwhile, the simpler …

Entanglement With Neutral Atoms In The Simulation Of Nonequilibrium Dynamics Of One-Dimensional Spin Models, Anupam Mitra

Physics & Astronomy ETDs

Quantum entanglement is a key ingredient for quantum information processing with capabilities beyond that of classical computation. We study the generation and role of entanglement in the dynamics of spin-1/2 models, both for the design of quantum gates for general-purpose quantum computation and for quantum simulation of interacting spin models. We introduce the neutral atom Mølmer-Sørensen gate, involving rapid adiabatic Rydberg dressing interleaved in a spin-echo sequence. We show its robustness to quasi-static experimental imperfections and favorable scaling with the time-energy scales of Rydberg-mediated entanglement generation. In quantum simulation, we consider critical behavior in quench dynamics of transverse field Ising …

Securing The Skies: Safety-Constrained Decentralized Multi-Uav Coordination With Deep Reinforcement Learning, Jean-Elie Pierre

Electrical and Computer Engineering ETDs

In the dynamic landscape of autonomous aerial systems, the integration of uncrewed aerial vehicles (UAVs) has sparked a paradigm shift, offering unprecedented opportunities and challenges in collaborative decision-making and navigation. This thesis explores the application of multi-agent reinforcement learning (MARL) for the planning and coordination of UAVs in complex environments.

The first part of this thesis provides an introduction to single-agent reinforcement learning and MARL. We provide examples of the use of MARL for countering uncrewed aerial systems (C-UAS). We formulate the Counter-UAS problem as a multiagent partially observable Markov decision process (MAPOMDP), and we propose Multi-AGent partial observable deep …

Overregularization Of Irregular Spanish Verbal Morphology: The Cases Of 2sg Preterit And Irregular Past Participles, Elisabeth Baker Martínez

Spanish and Portuguese ETDs

This dissertation investigates a widely observed phenomenon in child language acquisition: overregularization, which occurs when a child applies a regular linguistic pattern where an irregular form is expected (Bybee, 2015), for example, when a child overregularizes irregular 1sg Spanish sé ‘I know’ as sabo. This dissertation adds to the research on the overregularization of Spanish verbal morphology. The population of focus is Spanish-speaking children ranging from the ages of 1;10 – 12;4 with different language backgrounds (e.g., monolingual Spanish children, U.S. child heritage speakers). The studies included address the development of two Spanish morphological forms by focusing on children’s …

Variability In Large Mammal Activity Patterns When Visiting Water In New Mexico, Juan E. Camacho

Biology ETDs

Studying activity patterns of animals can provide vital information about how different species react to environmental changes, yet camera trap studies typically neglect the temporal aspect of the data. Using a 10-year camera trap dataset on Sevilleta National Wildlife Refuge, NM, we explored daily activity patterns when visiting water of five large mammal species. The species of study were mule deer, pronghorn, elk, oryx, and coyote. All species showed significant variability in activity patterns from site to site across the refuge. Within a site, differences in activity across years and seasons were less pronounced. Mule deer and coyote showed very …

Nonmarket Valuation Of Environmental And Agricultural Services: Renewable Energy, Wildlife Watching, And Index Insurance, Thaneshwar Prasad Paneru

Economics ETDs

The first essay examines the effect of individuals’ endogenously acquired beliefs about anthropogenic global warming on their support for renewable energy growth in the United States. Using the data from multiple rounds of National Surveys on Energy and the Environment for the falls of years 2015, 2016, and 2017. The results of the interval regressions show that those who believe in the existence of global warming are likely to pay more for renewable energy growth than those who do not and that those who believe that the primary cause of global warming is human activities are likely to pay the …

Going Beyond The Margins: Photographs By Ming Smith, Isis A. Serna

Art & Art History ETDs

Ming Smith is a photographer who has been creating images since the early 1970s and trained with the artist collective Kamoinge Workshop. Throughout most of her career, Smith has been marginalized by art historians, critics, and museum curators. Since the early 2000s, Smith has only been included in museum exhibitions highlighting African-American female artists from 1960 to the present. Before this surge of interest in her work, the art world ignored and silenced her. However, Smith’s creative process allowed her to see and experience going beyond the struggle by being consistent in her strategy to do what she wanted on …

Teacher Leadership And Principal Turnover In Elementary Schools: A Deductive Mixed Methods Multiple Case Study, Kenneth Salazar

Teacher Education, Educational Leadership & Policy ETDs

This study investigates the impact of principal turnover on teacher leadership, using mixed methods to analyze teacher leadership in low and high principal turnover elementary schools. Data collection includes teacher surveys and interviews with principals in four low turnover and four high turnover schools. Quantitative results indicate significant differences in teacher leadership, while qualitative findings reveal themes such as teacher professional development, support, leadership opportunities, anxiety, and sustainability. Mixed methods results suggest the need for increased time to develop trust between principals and teachers, greater teacher involvement in school leadership, more opportunities for teachers to share leadership, and a better …

A Hegelian Theory Of Divine Revelation, Jason D. Barton

Philosophy ETDs

Through an intensive examination of the second volume of G.W.F. Hegel’s oft-neglected Berlin Lectures on the Philosophy of Religion, I demarcate and elucidate a Hegelian theory of divine revelation. The second volume of these Lectures advances a series of configurations for religious consciousness through which absolute spirit passes in order to gain awareness of itself in the register of representation. While Hegel identifies divinity with absolute spirit in its moments and movements indicative of an odyssey, Hegel also ventures to painstaking lengths for the sake of authentically capturing how world-historical religions respectively portray(ed) the divine. Such a distinction between …

Comparative Analysis Of Sexual Harassment Policy And Implementation, Melanie Sayuri Dominguez

Political Science ETDs

Over the past three decades, as an increasing number of states have adopted sexual harassment legislation, many studies have examined the choices countries make to address and combat this issue. However, questions remain about what causes states to act while others resist change, why some countries choose to only introduce weak legislation rather than aggressively tackling the issue, and how people on the ground receive these policies. This dissertation uses a macro, meso, and micro approach to answer these questions on sexual harassment policy and implementation. First, using large-n data, I find that strong, feminist movements are correlated with the …

Robust Prediction Of Charpy Toughness Of Additively Manufactured Kovar Using Deep Convolutional Neural Networks, Nathan R. Bianco

Mathematics & Statistics ETDs

Understanding the reason for mechanical failures of manufactured parts in their operating environments is critical to prevention of future failures. However, in-situ post-mortem evaluation of physical properties, such as fracture toughness, is time consuming and alters the condition of the material, leading to potentially misleading findings. In this study, additively manufactured test coupons were produced over a wide range of process conditions to test the impact toughness of a material. The Charpy V-Notch toughness was measured on over 200 samples alongside corresponding optical images of both sides of the fracture surface. Convolutional neural network models were trained to correlate fracture …

Unboxing The Complicated Near Term Climatic And Geomorphic History Of Mars, Joshua Matthew Williams

Earth and Planetary Sciences ETDs

It has long been thought that glacial processes were unlikely within the tropical regions of Mars. However, growing evidence, including this work has identified and quantified relic glacial forms within the equatorial regions. These findings have major implications for understanding Martian climate history and its sensitivity to changes in insolation. As well, the presence of ice in the equatorial region of Mars has significant implications for the past global redistribution of the water ice in the Martian cryosphere. In this manuscript, I clarify and refine our understanding of the morphology of glacial features in the equatorial zone by applying novel …

History In The Present Tense: News And History On The Radio, 1924-1944, Steven R. Kostelecky

History ETDs

This dissertation addresses questions about the contested claim to an authoritative historical voice on American radio from its earliest days in the 1920s to its role in the Second World War in the 1940s. My major arguments involve, first, how the development of radio news in the 1930s took on the nature of “history in the moment” with live event programming—something its rival, the newspapers could not do. Secondly, with the press of world events, I argue, history and the news increasingly seemed to dovetail into the other on the radio, and the American Historical Association debated the most effective …

A Weather Radar Analysis Of The Effects Of The Albuquerque Urban Area On Thunderstorms From 2001 To 2020, Alexandra Jane Vivier

Geography ETDs

Urban areas have been found to affect the atmosphere locally through changes in emissions, thermal properties, the addition of moisture, and changes in airflow patterns. This study assessed the relationship between urban areas in central New Mexico and thunderstorm intensity and duration between 2001 and 2020. Weather radar data was used to derive thunderstorm events, as it is well-suited to fast-changing thunderstorm conditions. Regression analyses were used to determine the relationship between developed land cover and thunderstorm intensity and duration, while controlling for factors such as elevation, aspect, and near-surface temperatures. It was found that developed land cover was statistically …

A Multiple Case Study Of Asl Mentoring For The Field Of Interpreting, Andy Lim

Language, Literacy, and Sociocultural Studies ETDs

Drawn on the theoretical principles of sociocultural theory and constructivism, the aim of this multiple case study was to explore and understand the experiences of interpreting students, interpreter graduates, and pre-certified working interpreters after receiving ASL mentoring for at least 3 months to a year and to learn about the roles and impacts that ASL mentoring had on those groups of people as ASL mentees. Graduated from their respective 4-year universities for a bachelor’s degree related to the field of interpreting, participants included one interpreting student and one interpreter graduate, both of whom were from southern California, and one pre-certified …

Engineering Composite Gridlines For Improved Solar Module Reliability, Andre Chavez

Electrical and Computer Engineering ETDs

Renewable energy sources, such as solar power, are rapidly expanding worldwide to meet increased energy demands. However, these sources are exposed to challenging environmental stressors, such as extreme wind, heavy snow loads, and hailstorms that can cause irreversible damage to the crystalline semiconductor solar cells. Today, single crystalline silicon solar cells dominate the market, and our work is focused on improving their reliability against environmental stressors. One of the main degradation mechanisms caused by environmental stressors is cell cracks. These microcracks can go virtually undetected and lead to reduced power output from solar modules over time. To solve this engineering …

Exploring The Complex Landscape Of Proteins: From Intrinsically Disordered Proteins To Peptidomimetics Through Computational Approaches, Tongtong Li

Chemistry and Chemical Biology ETDs

Protein function is closely related to their three-dimensional structures. However, some proteins lack a well-defined structure, so-called intrinsically disordered proteins (IDPs). They prefer to interconvert among different conformations in isolation and undergo a disorder-to-order transition upon binding to a partner. IDPs or proteins with intrinsically disordered regions (IDRs), constituting a large portion of the human proteome, are involved in many cellular activities and are therefore highly relevant to our health. In my dissertation, I used computational methods to systematically study systems including dynamic proteins, disordered proteins in complex with their targets, and synthetic peptidomimetics to reveal the unique physical properties …

Welfare As We Know It Now: Examination Of State-Level Effects Of Welfare Expenditure And Policy Restrictiveness On Crime And Group-Specific Arrests Over Twenty-Four Years Following Reform, Elizabeth Ann Sabbath

Sociology ETDs

The current project investigates how two different ways of operationalizing welfare—as an expenditure or as a policy of restrictive regulations—could shape the distribution of crime rates within a place and over time. In addressing the significance of its measures, the project also explores how welfare interacts with the broader economic forces of a place to influence crime rates over time. Finally, the project explores how welfare measures can predict arrest rates disaggregated by different gender and race groups. Panel fixed effects measure whether within-state changes in crime and group-specific arrests are explained by expenditure and restrictiveness observed repeatedly from the …

An Examination Of Behavior Of Youtube Commenters, John E. Leonard

Computer Science ETDs

YouTube comments are a unique form of social media, as viewers mainly interact with other viewers through comments sections, and cannot choose to interact with specific people. This lack of control over which comments are presented to them forces users to view spam.

Multiple general patterns of behavior were found in the dataset of YouTube comments. For example, most users posted just after a video’s publication. In addition, users tended to watch videos in the evening over the early morning.

A novel method was found for quantifying the likelihood of coordinated accounts being controlled by one person using time sharing. …

Online Temporal Data Mining And Learning: Pursuing Enhanced Efficiency And Robust Algorithms, Sheng Zhong

Computer Science ETDs

Time series data mining and learning serve as a cornerstone across various domains, including finance, healthcare, and science. Recent advancements in network and sensor technologies have ignited an increasing interest in real-time temporal data mining and learning techniques. Various tasks benefit from these techniques, such as environmental monitoring, event detection, anomaly identification, and forecasting. However, these techniques still face significant challenges in the online environment settings, encompassing aspects like efficiency, accuracy, robustness, and scarcity of labeled data. This dissertation presents four innovative solutions: FilCorr, DCT-MASS, FewSig, and BitLINK to overcome these challenges. We evaluate each method and showcase their practical …

Indigenous Land Acknowledgement, Learning Spaces, And Sacred Places As Factors For Native American First-Year Students In Higher Education, Danielle E. Yepa Gunderson

Teacher Education, Educational Leadership & Policy ETDs

Native American undergraduate students have the lowest college degree completion rates, between 0.7% and 1%, of those earning an undergraduate degree (National Center for Education Statistics, 2017). The purpose of this study was to contribute to the research literature to improve college success by answering this research question: What are the experiences of first-year Native American college students when Indigenous land acknowledgement, dedicated learning spaces, and sacred spaces are present on their campus? This research was a baseline exploratory study that utilized a quantitative approach to survey first year, Native American students at nine public higher education institutions in the …