Digital Commons Network^™

A Stable Isotope Study To Investigate Water Movement In The Los Lagos Region Of Southern Chile, Kritan Subedi

Civil Engineering ETDs

The Los Lagos region in southern Chile, located in northwest Patagonia, features rain-fed agricultural lands, glacial lakes, forests, farmlands, and volcanic soils. This study investigates water movement within a micro-basin using stable isotope analysis and hydrological modeling over eight weeks. It aims to develop a conceptual model of water movement by elucidating interactions between precipitation, soil water, and streamflow. Findings highlight the critical role of deeper soil layers in sustaining streamflow during dry spells and indicate that soil acts as a buffer, maintaining hydrological continuity despite variable precipitation. Improved understanding of these dynamics can inform watershed management and water resource …

Engineered Cementitious Composites: The Good, The Bad, And The Possibilities, Michele M. Anderson, Michele M. Anderson

Civil Engineering ETDs

Construction materials require testing in the laboratory and field to be accepted as viable tools. Engineered cementitious composites (ECC) are a new material in the class of ultra-high-performance concrete studied and tested in the lab but not in the field. This research aimed to answer questions about ECC's ability to be a viable and cost-efficient construction material. The cost of ECC continues to be a factor in the acceptance of the material. Cost savings in construction and labor have not been identified until now, and it is good. Field condition testing of ECC in a desert climate known for extreme …

Optical Responses Of Hybrid Electromagnetic Nanostructures, Dominic Bosomtwi

Optical Science and Engineering ETDs

Fano resonances result from the interference between a broad background and a narrow state, producing asymmetric scattering profiles. Under specific conditions, destructive interference collapses the Fano resonance width, leading to bound states in the continuum (BICs) that localize light within a nanostructure while maintaining an infinitely high-quality factor (Q-factor).

This dissertation explores the design of nanostructures with multilayer hybrid plasmonic-dielectric metasurfaces using full-wave numerical simulations, facilitating multiple Fano resonances and BICs. By adjusting nanoantenna dimensions, multiple modes are excited at plasmonic-dielectric interfaces, leading to strong interactions and hybridization of energy levels, manifested as Rabi splitting.

These findings enable advancements in …

Transnational(Izing) African Communication: A Post-/Decolonial Approach To Nollywood And Globalization, Tomide Oloruntobi

Communication ETDs

In this dissertation, I examine culture and communication in transnational Nigeria, focusing on Nollywood and its industrial politics. Through a critical ethnographic examination of Nollywood’s reception among global and transnational audiences, I critique the evolving patterns of difference, power, and politics informing production, distribution, consumption, and performance/communication of otherness. With four composite dimensions of decoloniality: structural, epistemic, personal, and relational as theoretical foundation, I analyzed observations and interviews with 21 transnational Nigerians, online focus group discussions, user reviews, movies/series, and blogposts. I discuss the emergent themes of coloniality of space, mobility, and culture; re-making of racial otherness and hetero-patriarchy/normativity; cultural …

Embracing Social-Emotional Learning And Nurturing Character: A Systematic Review Of Intersectional-Eq Strategies For Educational Leaders, Leticia G. Candelaria-Archuleta

Teacher Education, Educational Leadership & Policy ETDs

The COVID-19 pandemic expanded education beyond traditional academics, highlighting the importance of social-emotional learning (SEL) and character education (CE) for positive youth outcomes. This study examined the role of educational leadership in implementing SEL and CE in schools through a term coined Intersectional-EQ. This study centered on a cutting-edge approach using grey literature, specifically doctoral dissertations, to capture current trends in unprecedented times. A systematic review through Covidence, guided by PRISMA and PICO frameworks, was conducted. Findings highlight the impact of leadership on SEL and CE through an intersectional lens. Future work is aimed to support holistic student growth by …

Dental Hygiene Burnout In Clinical Practice From Covid-19; A Pilot Study Using Self-Reported Questionaire, Yvette Valladares

Dental Hygiene ETDs

The purpose of this study was to determine if the Covid-19 pandemic had increased feelings of burnout in registered dental hygienists who were employed in clinical practice before and during 2020. A survey of registered dental hygienists in California was employed. Participants completed a modified Maslach Burnout Inventory, to evaluate emotional exhaustion (EE), depersonalization (DP), and personal accomplishment (PA). One open-ended question explored specific aspects of Covid-19 contributing to burnout. 162 surveys were completed and 139 met the inclusion criteria. Data analysis revealed that 40.29% reported high Emotional Exhaustion, 43.17% experienced low Depersonalization, and 85.61% reported high Personal Achievement. Lastly, …

Essays Analyzing Economic Consequences Of Caste Dynamics In India, Nikhil Ganvir

Economics ETDs

Scheduled Castes (SC) and Scheduled Tribes (ST) are historically disadvantaged communities that face discrimination on the grounds of their lower social positioning in society. This dissertation comprises 5 Chapters. Chapter 1 provides a brief outline regarding the stratification in India based on Caste and illustrates the importance of studying the economic consequences of caste-based discrimination in India. Chapter 2 analyses the effect of caste-based residential segregation in rural India and its effect on marginalized children's education outcomes. The results show that caste residential segregation dampens the education outcomes for children belonging to SC/ST communities with no discernable effects on students …

Ergonomics And Musculoskeletal Disorders: An Evaluation Of Self-Assessment Using Surveys, Shannon L. Sherman

Dental Hygiene ETDs

Musculoskeletal disorders, MSDs, are a serious issue many dental professionals experience. It is understood that improper ergonomics are a contributing factor to developing MSDs. Several factors can be implemented into a dental hygienist’s everyday routine to help decrease the risk of developing musculoskeletal disorders. The purpose of this study was to investigate how many practicing dental hygienists experience musculoskeletal pain from daily hygiene practice and how ergonomics contributes to their level of pain. The study also discovered through self-assessment, areas participating dental hygienists would be willing to improve on in their daily ergonomic practice to potentially help decrease or prevent …

Carbonate And Organic Proxies And The Impacts Of Climate On Lake Systems: Paleoclimate Interpretations From Lake Chalco, Mexico, Aria Holmes

Earth and Planetary Sciences ETDs

This project incorporates several lines of evidence to better understand the climate at Lake Chalco. Chapter 1 utilizes oxygen isotopes from carbonates and show that the Inter Tropical Convergence Zone varies on primarily glacial and millennial timescales; precession is not observed. These data indicate glacials periods were shallower and interglacials were wetter periods at Lake Chalco. Chapter 2 studies carbon, nitrogen, C/N, and TOC proxies and finds that the lake conditions during the glacials and interglacials are primarily a mixed algal-macrophyte-terrestrial organic matter. Deviations show that the lake during the interglacials had more algal organic matter- reflecting influxes of nutrients …

Sand, Ice, And X-Rays: Developing Xct Methods For Frozen Samples And Refining Siliciclastic Facies Models For Perennially Ice-Covered Lakes, Utilizing Cores From Lake Fryxell, Mcmurdo Dry Valleys, Antarctica, Holly M. Levett

Earth and Planetary Sciences ETDs

Sedimentation in perennially ice-covered lakes (PICLs) is proposed to be bi-modal, with mud deposited by stream inflow and sand deposited on the ice cover by aeolian processes and then melting through by absorption of solar radiation. Here, we consider Lake Fryxell, a PICL in the McMurdo Dry Valleys, and several lake bed cores about 30 cm in length, to better understand PICL facies through time, using micro X-ray CT (XCT). Using XCT images along with sieve and laser granulometry data, we constrained the grain-size of PICL deposits to dominantly medium / fine sand with a coarse component. The presence of …

Critical Geospatial Data Science: Principles For Curating, Analyzing, And Sharing Geospatial Data, Daniel Beene

Geography ETDs

Critical geospatial data science (CGDS) offers principles for engaging with geospatial data, methods, and translation by pulling from critical epistemologies in geography. CGDS interrogates objective “truths” in science by actively engaging in critique of geospatial data and methodologies. Specifically, CGDS contends with the political context and motivations behind geospatial data science (GDS) while using GDS methods to understand how social-spatial arrangements manifest and are reinforced through data. CGDS explicitly aims to inform practices for criticality from within GDS and provides opportunities for multidisciplinary research that incorporates social theories, contextualizes geospatial data, and critically evaluates the effects and ethics of (under)representation …

Functional And Structural Analysis Of The Neimann-Pick Disease Type C Pathway To Include Caveolin-1, Anthony Michael Seat

Chemistry and Chemical Biology ETDs

Human disease is often thought of as an all or nothing prospect, either one has the disease or one does not. This does not bear out in clinical or personal experiences, instead demonstrating that disease occurs within a spectrum ranging from presumed unaffected to demonstrably and detrimentally affected.Neimann-Pick disease is one example of this spectrum look into diseased states, with multiple named versions of a phenotypically similar disease. We focus on Neimann-Picktype C (NPC), which is the result of a disruption in the efflux of cholesterol and sphingolipids from the endocytic pathway. NPC demonstrates this concept of a spectrum of …

Chemical And Physical Properties Of Fine Fractions From A Village Proximate To A Uranium Mine: Insights About Soil Health, Mary P. Haley

Nanoscience and Microsystems ETDs

Thousands of abandoned uranium mines (AUM) in Native American tribal lands have not been fully remediated, leaving uranium mine wastes exposed and accessible for potential erosion and transport by wind. Analyzing the metal and organic content of the fine-grained fractions in soils could uncover the impact of mine legacy on the soil health in communities that live in proximity to AUM. This study investigates the physical and chemical properties of the fine-grained fraction (μm) of soils to quantify the effect of heavy metal-bearing particulates on the soil health in the village of Paguate and within the Jackpile-Paguate AUM located on …

Admission Requirements Among Dental Hygiene Programs: Key Indicators To Student Success, Justin R. Nance

Dental Hygiene ETDs

This descriptive study evaluated both cognitive (academic) and non-cognitive (personal) factors considered in the admission process and their correlation with student retention rates in dental hygiene programs. The research examined admission criteria and student retention rates for students who matriculated in 2021 and 2022, aiming to develop more effective admission criteria that predict student success and retention. A survey consisting of 20 multiple-choice questions was distributed to 327 accredited dental hygiene program directors in order to gather data. The survey achieved a 16% response rate. The results of this study provide insights into how to develop more effective admission criteria …

Embedding Direction Of Arrival And Antenna Beamforming Algorithms On Automated Software Defined Radio Platforms, Adrian J. Lewis

Electrical and Computer Engineering ETDs

Antenna arrays are an essential technology in the modern era in both communications and radar applications. The algorithms used for antenna arrays are beginning to be embedded in smart device applications to enable greater communication abilities. This thesis explores the idea of embedding direction of arrival and beamforming algorithms using a software defined radio platform. Specifically, the Multiple Signal Classification (MuSiC) algorithm and Minimum Variance Distortionless Response (MVDR) algorithm are combined. The combination of similar algorithms has the potential to be used in many internet of things applications to enable more dynamic communication ability.

Imperial Architecture And Absolute Chronology In The Inka State: The View From Northern Chile, Beau G. Murphy

Anthropology ETDs

Scholars often evaluate the political aspects of imperial architecture in terms of the symbolism of specific buildings, leaving a gap in our understanding of the political calculations of overall site layouts. This study of the architecture of the Inka provincial capital of Turi, located in the Atacama of northern Chile, identifies aspects of planning in the site’s layout that extend our knowledge of the use of architecture by past empires to communicate political messages. In so doing, the study addresses multi-scalar issues of a neglected Inka chronology, including the chronology of Turi itself, of Inka rule of the Upper Loa …

Development And Characterization Of Automated Screen Mesh-Based Microfluidic Device To Perform Continuous Countercurrent Liquid-Liquid Extraction, Quinn Mcculloch

Nanoscience and Microsystems ETDs

Continuous Countercurrent Microfluidic Liquid-Liquid Extraction (CC-MLLE) shows tremendous potential to generate large numbers of equilibrium stages of separation in a small footprint, with a minimum of pumping, valving, and phase separation steps. However, CC-MLLE rarely appears in literature because it requires a delicate balance between capillary and hydrodynamic forces for deterministic flow.

This dissertation showcases a patented screen mesh-based CC-MLLE invention that performs stable, long-duration (> 36 hr.), countercurrent liquid-liquid extraction and achieves 37 equilibrium stages within a 38.5 μl internal volume. The device is fabricated from chemically resistant polyetheretherketone plastic, using standard machine shop equipment, a plotting cutter, screen …

Compassionate Care In Elementary General Music Teaching And Learning As A Way To Respond To The World: A Narrative Inquiry, Julia K. Church Hoffman

Teacher Education, Educational Leadership & Policy ETDs

In this narrative inquiry, where stories were the data, three experienced music teachers from one public school district in the southwestern United States shared stories about their experiences as elementary general music teachers. The stories were told through the lens of compassionate care, a perspective that implies a shared experience between teacher and learners (Hendricks, 2018, 2023). The stories, and my interpretation of them, revealed an understanding of elementary general music, a multimodal, fun, school subject, as a vehicle for teaching children how to be kind and respectful humans. Threads that emerged from the stories linked connections between compassionate care, …

Topics In Wappo Phonology, Aaron W. Marks

Linguistics ETDs

This work examines various topics in the phonology and phonetics of the Wappo language (ʔonaʔcáṭis), an Indigenous American language spoken in Northern California. Utilizing both published written sources and the large audio corpus of spoken Wappo compiled by linguist Jesse Sawyer and housed at the California Language Archive at UC Berkeley, this work addresses several fundamental questions in Wappo phonology, including phoneme inventory structure, phonotactics, phoneme frequency, phonetics and allophony, word-level prosody, morphophonemics, and a detailed discussion of the context of Wappo phonology within the California Linguistic Area, including the question of a localized linguistic sub-area around the …

Adaptive Screen Capture Video Analysis, Ugesh Egala

Electrical and Computer Engineering ETDs

This thesis presents a system for analyzing student activities during class sessions to gain insights into the learning process. A dataset consisting of 14 screen recordings, with 2 videos labeled across two stages, was used for training, validation, and testing. The methodology employs adaptive sampling, initially at 10 frames per minute to identify active regions, followed by detailed analysis at 1 frame per second using OCR to detect typing activities through character changes. The results demonstrate over a 50% reduction in computational load while maintaining high accuracy in detecting student engagement. A total of 26 hours of screen capture videos …

Building Materials Cut From The Earth: A Look At Sod Construction Around The World And In New Mexico, Giulia Caporuscio

Architecture and Planning ETDs

Terrón, or sod, is an earthen building technology that is being lost. The blocks are cut directly from the ground, generally along banks of bodies of fresh water, marshlands, or grassland valleys. The resulting blocks are clay rich with plant root systems that provide strength to the construction material. This building material is found in archeological and modern structures around the world. Today the material and knowledge behind this earthen technology is being lost.

This paper starts by summarizing other studies of sod construction in Indigenous cultures of the Americas, homesteaders of the Plains of the United States and Canada …

Gnss And Insar Observations Of Vertical Motion In The Valles Caldera, Nm, Savannah Chase Devine

Earth and Planetary Sciences ETDs

The Valles caldera is a rhyolitic “supervolcano” formed 1.231 Ma. An understanding of whether Valles caldera is currently deforming is needed to inform volcanic hazard estimates for northern New Mexico and will allow for a better understanding of the hazards presented by other rhyolitic caldera systems. Here, we present an InSAR time series of the Valles Caldera using 37 interferograms, spanning 2014 to 2022, which show a small but consistent signal of broad pattern subsidence/yr. We also present GNSS observations from a survey conducted in October 2022 and compare the results to surveys in 2002 and 2003 to estimate the …

Conserved Mechanisms Of Drug Induced Lifespan Extension In S. Cerevisiae And C. Elegans, Christine E. Robbins

Biomedical Sciences ETDs

Aging is a phenomenon that brings aches, pains and a risk of developing diseases. Many researchers have discovered pathways that regulate aging by altering gene expression. Understanding genetic regulation of aging is key but identifying drugs that target aging will result in translatable treatments. Additionally, understanding how drugs are interacting with our cells allows us to create targeted therapies. I study two types of drugs. First, tRNA synthetase inhibitors are a class of drugs that inhibit charging of tRNAs. I identified a mechanism of lifespan extension by upregulation of the conserved transcription factor, Gcn4 / Atf-4. Second, I found that …

The Iep Team: Team Members’ Perspectives Of The Decision-Making Process, Peggy A. Duffie

Special Education ETDs

The Individualized Education Program (IEP) remains a pivotal document for ensuring educational equity for students with disabilities in public education (Bateman, 2017). This qualitative interview study investigated how an IEP team supporting a student with extensive support needs navigated the decision-making process during annual IEP development. Through in-depth interviews with six out of eight team members, I explored IEP team members’ perceptions of their and others’ responsibilities and contributions to the development of an annual IEP. Qualitative coding revealed four key decision-making themes: Unspoken norms, privileging professional knowledge, avoiding conflict and responding to disagreements, and identifying your place at the …

On The Surface Topography Of Local Overheating And Plasma Formation Due To Initial Condition Perturbations Sourcing The Electrothermal Instability On High-Current-Density Conductors, Maren Whiting Hatch

Electrical and Computer Engineering ETDs

The electrothermal instability (ETI) is a Joule heating-driven instability that instigates runaway heating on conductors driven to high current density, altering the 3D evolution of the expansion and phase state. Most metals include complex distributions of imperfections (voids, resistive inclusions) which seed ETI. To simplify comparison with modeling and theory, experiments examined growth of ETI from various alloys of stainless steel as well as relatively void/inclusion free, 99.999% pure, diamond-turned, 1 mm-diameter aluminum rods. Aluminum surfaces included a variety of deliberately machined and well-characterized perturbations, including 10-micron-scale quasi-hemispherical voids, or “engineered” defects (ED), and sinusoidal patterns of varying wavelength and …

Breaking The Silence: Autoethnographic Account Of Communication In The Aftermath Of Parental Suicide, Marissa L. Lucero

Communication ETDs

The silence that surrounds the suicide of a parent often masks unresolved feelings of guilt, shame, and powerlessness in families grieving their loss. For children, the long-lasting impact of suppressing communication about parental suicide can endure throughout adulthood. In this autoethnography, I un-salience my voice to reflect on my father’s suicide in the context of my Nuevo Mexicana identity. I assert my Chicana feminist voice through an extraction of gendered and culturally grounded memories, personal journal entries from my childhood, and a review of academic sources on suicide. This thesis is a personal and intellectual engagement with Chicana/o critical theory, …

Cell And Molecular Mechanisms Of Plasticity And Injury Associated With Spreading Depolarization, Jordan E. Weisend

Biomedical Sciences ETDs

Spreading depolarization (SD) is now established as a critical event contributing to the expansion of acute brain injuries. In areas with insufficient access to metabolites, SD results in episodic glutamate accumulation and NMDA receptor over-activation. Intriguingly, in areas with sufficient access to metabolites SD can result in synaptic strengthening, together suggesting SD consequences may vary widely based on metabolic context. Utilizing acute murine brain slices, this dissertation sought to interrogate the cell and molecular mechanisms of SD induced detriment and revitalization. We describe evidence that the primary NMDAR subtype involved in SD is GluN2A-containing NMDARs, and when targeted during SD …

Deep Sequence-Coupled Biopanning And Vaccine Development, Julianne Peabody

Biomedical Sciences ETDs

Virus-like particles (VLPs) are nanoparticles comprised of viral structural proteins. They physically resemble the virus from which they are derived but lack genomic material. They are non-infectious, non-replicating, and have a favorable safety profile. VLPs are highly immunogenic with a dense, repetitive structure that is strongly activating for B cells. VLPs can be utilized to develop vaccines and can be used either as direct immunogens or platforms for the display of heterologous antigens. The display of foreign peptides on VLPs can be used to elicit high-titer antibodies against the displayed peptide. A virus-like particle based on the RNA bacteriophage MS2 …

Ridgecrest: Past, Present & Future, Sunanda Sharmin

Architecture and Planning ETDs

The goal of historic preservation is to record our understanding of the past but also, look into the future. Preserving old buildings, structures and landscapes reduces carbon emission and preserves cherished glimpses of our shared human history. Consequently, adapting our treasured historic sites to endure the mounting impact of climate related challenges—be it rising sea levels, tempestuous storms, inundating floods, relentless droughts, or raging wildfires—stands as an imperative mission.

This thesis documents a historic landscape - the Ridgecrest Drive in Albuquerque, New Mexico and then explores principles and ideas that need to be considered to generate a more responsive setting …

Deep Learning For Multiple Unmanned Aerial Vehicle Coordination In Air Corridors, Liangkun Yu

Electrical and Computer Engineering ETDs

In the future, city skies will be filled with Unmanned Aerial Vehicles (UAVs) for rapid urban transport, including parcel deliveries and air taxis. NASA's Urban Air Mobility (UAM) envisions UAVs navigating air corridors. These virtual pathways ensure safety and compliance with regulations. However, current research on UAM practical applications is limited. This dissertation focuses on designing air corridors, developing UAV control systems, and ensuring the robustness of control algorithms against disturbances in real-world environments.

Our design features an air corridor system with horizontal lanes and on-off ramps, conceptualized as cylindrical spaces and tori, respectively. To enable each UAV to locally …