Digital Commons Network^™

Essays On Macroeconomic Development, Gaspar Alarcon Szmulai

Arts & Sciences Graduate Student Theses and Dissertations

This dissertation consists of two independent chapters in the field of Macroeconomics. The first article studies the implications of complementarity on productivity under financial frictions. Does improving the access to financing lead to more productive firms? We develop a model of heterogeneous producers facing collateral constraints and a technology adoption decision. Producers' choices are connected through the final good market, creating complementarity in adoption. We find that more complementarity between producers amplifies the effects of financial frictions through more sensitive adoption. In a high-complementarity economy, adopters increase up to 219% relative to the self-financing economy. Misallocation is the main driver …

Identity, Needs, And Conflict Online: Understanding Cultural Fragmentation In The Black Diaspora, Imhile Omosede Dora Akpata

Dissertations and Theses

This study examines how identity formation, intra-diaspora tensions, and social media interactions contribute to fragmentation within the Black diaspora. While existing scholarship, including work by Godfried Asante and Elizabeth Chacoko has emphasized the fluid and socially constructed nature of Black identity, less attention has been given to how these processes operate in practice across diverse diasporic groups and how they are intensified in digital environments. This research addresses this gap by analyzing how individuals negotiate Black identity, how tensions emerge within the diaspora, and how social media shapes and amplifies these dynamics.

Drawing on Social Identity Theory developed by Henri …

Improving The Fpga Radio Design Cycle: Implementing Dvb-S2 Modulation Using Verilator And Gnu Radio, Seth Pellegrino

Dissertations and Theses

In embedded digital radio systems, a central challenge is meeting the real-time throughput required to process the samples--especially for space-bound ultra-wideband SDRs which must handle more than 100 Gbps entirely onboard. An FPGA's programmable logic offers sufficient potential, but realizing a particular radio flow is a project usually fraught with defects and long turnaround times. We simulated Verilog modules in a custom harness that adapted a Verilated model to GNU Radio, which allowed for breaking down a complicated radio flow (here, DVB-S2 modulation) into a series of well-bounded problems each with clear criteria for success. The framework, built on open …

The Evolution Of Regulatory Architectures Underlying Phenotypic Plasticity, Shweta Agarwal

Biology ETDs

Phenotypic plasticity refers to a mechanism where a single genotype results in distinct phenotypes in response to distinct environments, making it a key mechanism for persistence under environmental change. Phenotypic plasticity can arise from two distinct regulatory architectures: epistatically regulated plasticity or environmentally sensitive loci. The evolutionary forces shaping these architectures remain unclear. I use the recombination modifier framework to explore how the regulatory architecture of plasticity evolves across a range of selection regimes, including the rate of environmental change and the costs and benefits of plasticity. I find that the evolution of the regulatory architecture of phenotypic plasticity requires …

Scale-Dependent Drivers Of Demographic Change For American Pikas (Ochotona Princeps) In Glacier National Park, Montana: Local Habitat Characteristics Vs. Regional Climate Trends, Danielle M. Owens

Biology ETDs

Climate change is shifting thermal environments globally, driving range contractions, upslope movement, and poleward shifts across taxa. However, these changes are not uniform: microclimates, shaped by topography, can amplify or decouple operative temperatures from regional trends. The American pika is an ideal model for studying climate-driven population change given its strong site fidelity and thermal sensitivities. We re-surveyed 173 sites in Glacier National Park, originally surveyed in 2007-2010, using an AIC-based model selection to test competing local and regional hypotheses driving three demographic processes: persistence, colonization, and within-patch density change. Pika occupancy increased over the 15-year period, with a net …

Finding Fish Families: Movement And Demography Of Loach Minnow (Tiaroga Cobitis) Inferred From Gt-Seq-Enabled Kinship Analysis, Patrick C. Baca

Biology ETDs

River fragmentation poses major threats to freshwater biodiversity by reducing connectivity and limiting persistence of imperiled desert fishes. Connectivity in streams is impaired by anthropogenic changes, including road crossings, prompting the installation of engineered fish passage structures at low-water road crossings and raising questions about the dispersal of aquatic species across these structures. This thesis investigates the movement of the threatened Loach Minnow (Tiaroga cobitis) by applying a close-kin mark-recapture (CKMR) framework in a restored stream (including a fish passage) and a stream without rehabilitation efforts. We developed and optimized a GT-seq panel for relatedness analysis and used it to …

Using Temporal Genomic Data To Uncover Patterns Of Genetic Diversity And Signatures Of Selection For Management Of A Threatened Minnow Species, Erika A. Dunn

Biology ETDs

The Little Colorado River (LCR) spinedace persists only in three isolated watersheds within the LCR Basin in Arizona. This imperiled minnow faces ongoing pressure from habitat alteration, climatic shifts, and invasive non-native predators. Over the past two decades, managers have translocated spinedace within watersheds to increase abundance and expand habitat occupancy. We sequenced a reference genome and analyzed single nucleotide polymorphisms (SNPs) from 475 individuals over their geographic range. DNA samples were obtained from a previous study in the mid-1990s and compared with samples from 2024 and 2025, allowing us to track genetic diversity, effective population size, population structure, and …

Autotrophic And Heterotrophic Contributions To Soil Co2 Fluxes And Variability In A Chihuahuan Desert Grassland, Savannah B. Sanchez

Biology ETDs

Drylands are major drivers of interannual variability in the global terrestrial carbon sink, and their influence is expected to increase as climate change promotes the expansion of hotter and drier regions. Predicting the consequences of these shifts remains challenging because ecosystem models are largely developed for mesic systems, which differ from drylands in water and nutrient availability, decomposition rates, respiration dynamics, and microbial communities. Improving our understanding of carbon cycling in drylands is therefore critical. This research focuses on soil CO₂ efflux, a major pathway of terrestrial carbon release driven by plant root respiration and microbial decomposition. I investigated the …

How To Measure A Carnivore: Understanding The Scaling Of Cranial And Postcranial Elements With Body Mass, Marina Casiano Ruiz

Biology ETDs

Body size is a fundamental predictor of ecological function, life history, and population dynamics in mammals. However, direct measurements of body mass remain unavailable for many rare or extinct species, particularly within the order Carnivora. Allometric relationships between skeletal dimensions and body mass provide a tractable solution; however, previous studies have been limited in their taxonomic scope or trait diversity. Here, we quantify the scaling of 82 cranial and postcranial traits across 97 species from 11 carnivoran families spanning four orders of magnitude in body mass (20g to >500kg). Additionally, we examine the influence of phylogenetic relatedness, dietary specialization, and …

Boundary Integral Method For A Modified Mullins–Sekerka System, Ly Le

Mathematics & Statistics ETDs

This thesis develops a boundary integral method for a modified Mullins–Sekerka system arising as the sharp-interface limit of a nonreciprocal Cahn–Hilliard model. Nonreciprocal coupling changes the classical Cahn–Hilliard structure by introducing an additional conserved field, leading to coupled elliptic and parabolic dynamics at the interface. Using matched asymptotic expansions, we formally derive the modified Mullins–Sekerka model and then apply the boundary integral method to rewrite it on the moving interface. The elliptic component is represented using the periodic Green’s function for the Laplace equation, while the parabolic component is represented using the periodic heat kernel. This method reduces the bulk …

Nerve Constructions And Mapper, Alexander Bram Fritschi

Mathematics & Statistics ETDs

Mapper is a data visualization tool commonly used in topological data analysis to study large, often high-dimensional datasets. Mapper operates through the selection of a lens function, a clustering algorithm, and a cover. The Mapper graph is constructed using the nerve of the cover after the clustering algorithm is performed; it is therefore useful to study nerves to better understand Mapper. In this thesis, we will utilize the properties of nerves to find the minimal point set that produces a given graph. We will then extend this to Mapper to determine what Mapper graphs may be constructed over a given …

Interpretable Case-Control Inference Through Log-Linear General Location Models, Zacharia Stuart

Mathematics & Statistics ETDs

This dissertation analyzes one of the few publicly available NFL injury datasets to study field type and non-contact lower-limb injuries. Field type is studied jointly with other risk factors to understand how these factors interact to affect injury risk. The data were gathered through a case-control sampling scheme, which limits direct inference on absolute injury probabilities. While not the most common approach for case-control data, this dissertation models the retrospective distribution directly through Log-Linear General Location Models (Log-Linear GLOMs). Through a log-linear structure placed on a log-odds-ratio reparameterization, the model provides directly interpretable marginal and interaction contributions to injury log-odds …

The Uncertainty Principles, Lee Michael Felicetti

Mathematics & Statistics ETDs

The Heisenberg uncertainty principle is a central aspect of quantum mechanics, but also illustrates an essential quality of the Fourier transform. After Heisenberg, a variety of uncertainty inequalities emerged in the fields of physics and mathematics. In this thesis we will analyze the Heisenberg uncertainty principle in both the setting of quantum mechanics and Fourier analysis. We will then look at how the work of Heisenberg has been expanded upon in both physics and mathematics. Particularity, we will see how uncertainty principles can be applied to signal recovery and explore current research in this field.

The Fourth Trimester: Enhancing Postpartum Depression Detection In Primary Care Through Early Screening And Patient Education, Riley Goldschmidt

DNP Projects

Background:
Postpartum depression (PPD) is a common and often underrecognized complication, with many cases going undetected due to inconsistent screening practices in primary care. Delayed identification can negatively impact maternal well-being, infant bonding, and overall family health outcomes. This quality improvement project aimed to improve early detection of PPD by implementing routine screening and patient education during newborn visits in a primary care clinic.

Methods:
The intervention integrated the Edinburgh Postnatal Depression Scale (EPDS) into the existing newborn visit workflow and introduced an evidence-based educational toolkit containing information on PPD symptoms, guidance for seeking care, and a QR code for …

Improving Outpatient Provider Preparedness Through Simulation-Based Training: A Quality Improvement Project, Kristina Weyer

DNP Projects

Introduction:
Simulation-based training is an effective educational strategy, particularly for high-acuity, low-frequency events such as patient decompensation in outpatient settings. However, there is a gap in both literature and practice regarding provider participation in simulation, as competing clinical demands often limit engagement. Local organizational leaders identified limited opportunities for outpatient providers to practice management of acute decompensating patients. The purpose of this project was to evaluate provider competence and confidence in managing a decompensating patient in the outpatient setting and to assess perceptions of the value of time spent in simulation.

Methods:
This quality improvement project evaluated providers who participated …

Targeted Nursing Bootcamps For Critical Access Hospital Nurses: A Program Evaluation., Nicholas Popp

DNP Projects

Background: Registered Nurses employed in critical access hospital settings are required to care for patients across the lifespan with varying levels of acuity. The registered nurse (RN) must be competent in providing medical, surgical, pediatric, obstetric, and intensive care-level services. However, the additional training they receive to care for their patients may be minimal or nonexistent, leading them to seek employment at other facilities due to safety concerns. Leadership within the organization believed that implementing targeted monthly nursing skills boot camps could increase nurses’ competence, confidence, and retention in critical access hospital settings.

Aims: This program evaluation project aimed to …

Bridging The Gap: Development And Implementation Of A Caregiver Educational Guide For Post-Lung Transplant Caregivers, Megan Aller

DNP Projects

Background: Caregivers of post-lung transplant recipients play a critical role in postoperative recovery, as patients require continuous support during the first three months after transplant. Despite this responsibility, caregivers frequently experience burden, stress, and challenges adapting to the complex demands of the caregiving role.

Aim: To evaluate the feasibility and preliminary outcomes of a tailored caregiver education and support guide for caregivers of lung transplant recipients.

Local Problem: Within the local transplant program, caregiver education primarily relied on verbal instruction with limited caregiver-specific take-home resources.

Methods: This quality improvement project used a two-group pretest–posttest design to evaluate the …

Nurse-Led Quality Improvement Asthma Self-Management In Primary Care, Jolene Steinert-Abderhalden

DNP Projects

Background:
Poorly controlled asthma contributes to preventable morbidity, yet many adults lack consistent self-management support. Local Problem: Baseline assessment at a rural Midwestern clinic revealed limited asthma knowledge, inconsistent action-plan use, and low confidence among adults with Asthma Control Test (ACT) scores below 20.

Methods:
This quality improvement project used a pre- and post-intervention design guided by Lean methodology and the Plan-Do-Study-Act (PDSA) framework. Interventions: Registered nurses delivered standardized asthma education, inhaler-technique review, and action plan reinforcement with monthly structured follow-up for 16 weeks.

Results:
Among four enrolled participants, three completed follow-up. Mean ACT scores improved from 17.5 at baseline …

Evaluating Preoperative Education Modalities For Orthopedic Surgery Patients, Hannah Johnson

DNP Projects

Effective preoperative education is essential as total joint arthroplasty (TJA) procedures shift to outpatient care, yet traditional education methods may not be meeting patients’ diverse learning styles. This Doctor of Nursing Practice (DNP) project aimed to evaluate the impact of multimodal preoperative education (in-person, virtual, hybrid video modules, or a combination) on patient-reported anxiety and discharge readiness, as well as length of stay (LOS), surgical site infections (SSIs), and 30-day readmissions. The in-person portion could not be implemented due to staffing constraints. The pre-post evaluation was conducted with a sample of 273 patients undergoing elective hip and knee arthroplasty (pre …

Bridging The Gap: Empowering Primary Care Providers With Nonpharmalogical Strategies For Adhd Management, Grace Sawyer

DNP Projects

Attention-deficit/hyperactivity disorder (ADHD) affects many adults and children and is commonly managed with pharmaceutical drugs. Although evidence supports the use of nonpharmacological, many providers may not know or have the confidence to use these modalities to incorporate these into practice. This educational gap could contribute to an overreliance on medication when there are other options available for comprehensive ADHD care.  This quality improvement pretest-posttest design aimed to bridge the gap in provider knowledge and confidence regarding evidence-based nonpharmacological ADHD management at two college health clinics.  The intervention consisted of four pre-recorded modules delivered over four weeks that focused on exercise, …

Evaluating An Educational Intervention On Penicillin Allergy De-Labeling Among Graduate Nursing Students, Allison Desmond

DNP Projects

Background
Approximately 10% of patients report a penicillin allergy; however, up to 90% of these individuals are not truly allergic. Inaccurate penicillin allergy labels contribute to inappropriate antibiotic use, increased healthcare costs, and antimicrobial resistance. Education on penicillin allergy testing remains limited among future Family Nurse Practitioners (FNPs).

Methods
A quantitative quality improvement project using a pretest-posttest design was conducted among second- and third-year Doctor of Nursing Practice–Family Nurse Practitioner (DNP-FNP) students enrolled in Pharmacology II or Advanced Practice Nursing III at a Midwestern liberal arts college. Participants completed a 15-minute voiceover PowerPoint educational intervention on penicillin allergy testing and …

Improving Provider Knowledge And Confidence In Hormone Replacement Therapy Through A Quality Improvement Educational Intervention, Caitlin Schmidt

DNP Projects

Background
Menopause is associated with symptoms that can significantly diminish quality of life. Hormone replacement therapy (HRT) remains the most effective intervention for moderate to severe menopausal symptoms. Despite evidence-based guidelines endorsing its use in appropriately selected patients, HRT utilization remains limited.

Local Problem
A gap in provider knowledge and confidence regarding HRT prescribing was identified in a rural primary care clinic in the Midwestern United States. The clinical needs assessment revealed an absence of standardized menopause-specific education and highlighted an opportunity to improve evidence-based menopause management.

Methods
This quality improvement project employed a pre-post educational design guided by the …

Registered Nurse Procedural Sedation In Operating Room: An Analysis Of Patient Safety And Nurse Confidence Efficacy Of 2 Years Post Implementation, Cassandra Fredrickson

DNP Projects

Background
A Midwest hospital implemented a registered nurse (RN) procedural sedation program to provide safe, cost-effective sedation for selected operating room procedures under physician supervision, improving patient access while optimizing anesthesia resources.

Methods
A retrospective descriptive program evaluation examined 1,117 patients who received RN-administered procedural sedation for vascular and neurovascular procedures during 2022 and 2024. Outcomes included anesthesia consultation, anesthesia takeover, reversal agent use, and adverse events. Patient demographics and procedure duration were analyzed. Six procedural sedation nurses completed a self-efficacy survey assessing confidence in sedation-related competencies. Descriptive statistics and qualitative review of adverse event narratives were performed.

Results
Among …

Biologically-Based Alternatives To Plastic Mulch Enrich Microbiome And Buffer Yield In Small-Scale Strawberry Production, Olivia L. Fragiacomo

Master's Theses

Much of commercial agriculture has used plastic mulch since the 1950s to contain fungicides and fertilizers, control weeds, retain soil moisture, and warm the top soil to start the growing season earlier. Research suggests that small-scale strawberry (Fragaria x ananassa) growers may be able to incorporate biological techniques, such as wheat straw mulch with microbial amendments, to reduce the use of single-use plastic mulch with a comparable yield. For this study, I carried out a randomized complete block comparison of five strawberry management techniques: plastic mulch (PM), straw mulch alone, and straw mulch inoculated with either arbuscular mycorrhizal fungi (AMF), …

Mining Legacy And Wildfires: Interfacial Reactions Affecting Metal Mobility, Eresay Alcantar-Velasquez

Earth and Planetary Sciences ETDs

We identified water labile interfacial reactions between laboratory burned pinewood ash and mine waste solids that influence metal mobilization. The Upper Gallinas Creek Watershed in New Mexico is affected by wildfires and mining legacy. Pinewood and mine waste sediments were sampled from the area, and the pinewood was burned at 350°C to simulate medium burn intensity ignition. Rapid desorption and gradual dissolution of Mn and Fe was detected by ICP-MS as pH decreased over time. After reacting 18 MΩ ultra-pure water with a mixture of pinewood ash and mine waste sediments Fe (143%) and Mn (89.2%) concentrations increased over time. …

Mapping Along-Strike Changes In Shallow Subduction Zone Geometry At The Alaska Subduction Zone Using Seismic Reflection And Tectono-Geomorphic Analysis, Madelyn K. Hurd

Earth and Planetary Sciences ETDs

The Alaska subduction zone, where the oceanic Pacific plate subducts beneath the continental North American plate at a rate of 60-66 mm/yr, has hosted more >M8 earthquakes over the last century than any other subduction zone globally. The largest of these, the 1964 M9.2 Alaska earthquake, ruptured 800 km of the margin, including a high slip patch near the trench offshore Kodiak Island. The 1964 rupture area may have overlapped with the 1938 M8.3 Semidi earthquake rupture zone that lies to the west. Slip propagation near the subduction trench during large earthquakes can control tsunamigenesis, and differences in wedge geometry …

Information Theory Analysis Of Water Vapor Stable Isotopes From The Sail Campaign, Matthew John Rybecky

Earth and Planetary Sciences ETDs

Understanding the processes that control water vapor isotopic composition in mountain environ- ments is essential for interpreting isotope records and predicting water resource responses to cli- mate change. This thesis applies information theory to continuous, high-resolution water vapor stable isotope measurements from the Surface Atmosphere Integrated Field Laboratory (SAIL) campaign in the East River watershed of Colorado’s Upper Gunnison Basin, spanning the winter- to-spring transition of 2022–2023. The analysis employs Shannon entropy, mutual information, transfer entropy, and joint transfer en- tropy (JTE) to quantify how environmental variables, including surface meteorology, radiation, tur- bulent fluxes, and ERA5 reanalysis products, transfer information …

Effect Of Geothermal Conditions On Silica Flour Modified Wellbore Cement, Travis Benjamin Broadhurst

Civil Engineering ETDs

Considerable work has been conducted on modified wellbore cements, but a knowledge gap exists in the effects of downhole conditions on cement, especially tensile strength. In this study, a pressure vessel simulates representative downhole conditions (200⁰C, 1.5 MPa) with a reference solution for geothermal brine and naturally occurring geothermal gases. Samples are removed after 28-days for unconfined compressive strength testing, Brazilian tensile strength testing, elastic moduli measurement, and chemical analyses by X-ray diffraction and electron microprobe. Aqueous chemical analysis suggests multiple active reactions between the geothermal fluid and cement that are exacerbated by higher temperatures, but do not …

On Food, Politics, And The Power Of Representation In The American History Museum, Mason A. Bright

Museum Studies Theses

This study explores the political implications of foodways-related interpretation at American history institutions, situating it within current partisan discourse. Using an “Anthropology of Museums” framework, I place literature from the fields of food history, human geography, and museum studies in conversation with interviews with three curatorial professionals from the National Museum of American History, the Henry Ford Museum of American Innovation, and the New Mexico History Museum. I understand the ways these professionals navigate politically engaged interpretation through the lens of ethnographic refusal, a phenomenon drawn from the anthropology subfield of resistance studies. I argue that the connections between food …

Gradients Of Abandonment, William Tatman

Geography ETDs

As urban-rural disparities drive depopulation in rural areas worldwide, local strategies emerge as pathways for resilience. Research on Ojika, a Japanese island that has lost 75% of its population since the 1960s, reveals an Abandonment Gradient: a nuanced pattern of disuse adapted to modern polycrises. Extending the concept of "lying fallow" to homes and infrastructure, this thesis focuses on abandonment practices that reflect complex realities of labor, capital, and climate uncertainty. Rather than viewing depopulating communities as passive victims of out-migration, this paper argues they are critical sites for generating crisis response. Communally crafted attitudes toward unused space and more-than-human …