Digital Commons Network^™

Structural And Dynamic Properties Of Gas-Phase Molecules In High-Order Harmonic Generation: Insights From Time-Dependent Density Functional Theory Calculations, Christopher Michael King

Graduate Student Theses, Dissertations, & Professional Papers

High-order harmonic generation, or HHG, is a highly nonlinear quantum optical process capable of generating X-ray/ultraviolet radiation. An atom or molecule is irradiated with a mid-IR laser at high intensity, ionizes, and then emits high-frequency light at integer multiples of the driving laser frequency when an ionized electron recollides with the molecular ion. A convenient tabletop source of coherent XUV light and a common seed for free-electron lasers, HHG can also serve as a self-probe of the source atom or molecule. In the latter case, the HHG spectrum can provide valuable insight into the structure and dynamics of the species …

Structural Optimization And Stability Enhancement Of Uba(2) And Ntl9 Using The Computational Tool: Emcast, Bahar Ghazi Esfahani

Graduate Student Theses, Dissertations, & Professional Papers

This study enhances protein stability prediction by refining EmCAST (Empirical C-Alpha Stability Tool), a computational tool used to identify stabilizing mutations in protein domains. We applied EmCAST to two model proteins: the α-helical ubiquitin-associated domain 2 (UBA(2)) and the α/β N-terminal domain of ribosomal protein L9 (NTL9). Protein stability is critical for proper function, and mutations can lead to misfolding and disease. To validate EmCAST’s predictions, guanidine hydrochloride-induced denaturation was monitored using circular dichroism (CD) spectroscopy for both wild-type and mutant variants. Results guided refinements to EmCAST’s algorithm, incorporating new experimental datasets to improve accuracy. Additionally, we examined the assumption …

Kinetic Grain Growth In Firn Induced By Meltwater Infiltration On The Greenland Ice Sheet, Kirsten Leigh Gehl

Graduate Student Theses, Dissertations, & Professional Papers

The microstructure of polar firn governs its porosity, permeability, and compaction rate, and is therefore important to studies of surface elevation change, heat and gas exchange, and meltwater infiltration on ice sheets. Previous work on high-elevation, dry-firn has identified two distinct atmospheric drivers of kinetic grain growth in deposited snow, but both mechanisms result in near-surface mm-scale layers. In this work, we show that meltwater infiltration through surface wetting fronts and deep preferential flow in the Greenland Ice Sheet (GrIS) percolation zone leads to the formation and preservation of centi- to decimeter scale layers of faceted firn, ranging from faceted …

The Relationship Between Principals’ Transformational Leadership And Teachers’ Organizational Citizenship Behavior Within Public Primary And Middle Schools In Baotou, Inner Mongolia, China, Chuxuan Yin

Graduate Student Theses, Dissertations, & Professional Papers

This non-experimental causal-comparative study was designed to explore the relationship between principals’ transformational leadership and teachers’ organizational citizenship behavior within public primary and middle schools in Baotou, Inner Mongolia, China, as well as the differences in principals’ transformational leadership and teachers’ organizational citizenship behavior based on demographic characteristics. A sample of 142 principals and 675 teachers was recruited. Data collection utilized two validated instruments: the Transformational Leadership Questionnaire for evaluating principals’ transformational leadership level, and the Organizational Citizenship Behavior Scale for Primary and Middle School Teachers for measuring teachers’ organizational citizenship behavior level. Both descriptive statistics (frequency distribution, mean, standard …

Modeling Neighborhoods As Fuel For Wildfire, Bryce Alan Young

Graduate Student Theses, Dissertations, & Professional Papers

Wildfire models drive billions of dollars in risk mitigation efforts. However, the modeling community currently lacks a representative fuelscape on which to base simulations of fire spread in the built environment and the wildland-urban interface (WUI) where vegetation and structures act together as fuel for wildfire. This thesis advances wildfire risk modeling by addressing the underdeveloped representation of the built environment in existing frameworks. By identifying inconsistencies in how structure and defensible space features are defined and used across empirical studies, predictive indices, and fire spread models, this research lays the groundwork for standardized modeling approaches and feature selection (Chapter …

Worn History: The Biography And Value Transformation Of Emma Sansaver's Dress, Lauren I. Stgeorge

Graduate Student Theses, Dissertations, & Professional Papers

This thesis examines the life of Emma Sansaver’s beaded buckskin dress as both a material object and a cultural witness. Worn during her time at the Fort Shaw Government Industrial Indian Boarding School and the 1904 St. Louis World’s Fair, the dress intersects with assimilationist policy, Indigenous resilience, public spectacle, and personal memory. Unlike the regalia of her teammates, Emma’s dress was preserved, first by Emma herself, then by her descendants, and continues to be cared for and displayed in educational and institutional settings today.

Using the theoretical frameworks of Arjun Appadurai and Igor Kopytoff, this project approaches the dress …

Fluvial Geomorphic Resilience In Alluvial Mountain Rivers To Large Floods, Riley T. Henson

Graduate Student Theses, Dissertations, & Professional Papers

As hydroclimatic extremes intensify, large floods increasingly reshape river systems and threaten infrastructure. Fluvial geomorphic resilience, defined as a river’s resistance to, and recovery from, flood disturbance, offers a useful framework for understanding river response and guiding management. We assessed resilience at two scales: (1) a detailed geomorphic and hydraulic analysis of the June 2022 flood on East Rosebud Creek, Montana, which was part of broader flooding in the Greater Yellowstone Ecosystem, and (2) a broad-scale comparison of 12 flood-impacted alluvial mountain rivers across North America and Europe. We quantified resistance using active channel width ratios (W_R) and …

Alive For The Wake, Anna Kate Powell

Graduate Student Theses, Dissertations, & Professional Papers

In the year 2046, bacteria strain B. bibitor has rendered all petroleum hydrocarbon compounds unrefinable. Paramedic Amanda Bailey finds hope in the resilience of humanity but struggles when she learns the powers that be would rather concentrate their efforts on fighting B. bibitor—restoring infected hydrocarbons to their previously refinable (and profitable) nature—rather than investing in already-developed clean firm energies and renewable material manufacture.

Eros And The Sublime: Tools For Reaching Toward An Altered Ecological Consciousness, Aineka Carlson

Graduate Student Theses, Dissertations, & Professional Papers

This thesis explores connections between the Kantian sublime and Anne Carson’s ideas regarding “eros.” Since Kant’s Critique of Judgement was published in 1790, the Kantian sublime has grown in popularity and been utilized by theorists and creative writers alike. While the Kantian sublime is often associated with nature in popular culture, there are certain egocentric and phallocentric elements of this mode of thinking that might inhibit a biocentric mindset. Through a character study of Oryx from Margaret Atwood’s novel Oryx and Crake, this thesis draws relations between the subjugation of women, nature, and the ways in which the popularized …

Lives And Lessons Of Zoo Animals, Nicole Emlen

Undergraduate Theses, Professional Papers, and Capstone Artifacts

This project was an interdisciplinary museum exhibit that was displayed at the Montana Natural History Center between April 4 and May 12, 2025. It displays my photographs that I took of some of the animals I worked with during my summer 2024 internship at ZooMontana. In this project, I educate the public about three main functions of zoos--rescue, conservation, and education--through the stories and lives of four species. These animals all have unique stories that are important to share to improve public knowledge of why zoos are important and how we can improve relationships between humans and wildlife. Photography is …

A Critical Juncture: The Convergence Of Natural Resource Management And Tribal Sovereignty, Anna Aleta Butterfield

Graduate Student Portfolios, Professional Papers, and Capstone Projects

This portfolio reflects the work I’ve done in my four years as a dual degree student, pursuing a Master of Science in Environmental Studies and a juris doctorate degree, and focuses on policies and laws surrounding natural resource management. It touches on how those policies relate to and expand or constrict the exercise of sovereignty by indigenous populations.

This piece first considers the effects of plastic on salmon populations and those indigenous groups that rely on salmon for subsistence and cultural purposes. The remaining three pieces focus on various aspects of the Confederated Salish and Kootenai Tribes - Montana Water …

“Behavior Modeling And Creative Confidence In The High School Visual Arts Classroom”, Jessica A. Novak

Graduate Student Theses, Dissertations, & Professional Papers

Artistic behavior modeling is essential for the development of creative confidence in both the teacher and students. In this study, I adopted a mixed methods approach incorporating both qualitative and quantitative data to determine the impact of artistic behavior modeling on creativity and independence in high school visual arts. The impact of behavior modeling was studied in a student-led, studio-style approach in the classroom. Utilizing writing prompts, observational data, self-reflections, artwork development, and letter grades, I determined that when educators create and reflect on their personal art alongside their students, students become more creatively independent. Students took more creative risks, …

Sunrise In The Heartland: The Ahmadiyya Movement And The Foundations Of African American Islam, Hazel Videon

Graduate Student Theses, Dissertations, & Professional Papers

During the early 1920s, an immigrant missionary from colonial India named Muhammad Sadiq established headquarters in Chicago for a branch of Islam called the Ahmadiyya Movement in Islam (AMI). The AMI became the first institutional expression of Islam in the United States to draw a significant number of American converts and was particularly popular among African Americans. Following the Second Great Migration, Black migrants to the urban Midwest sought new ways to express their identity, fulfill both spiritual and material needs, and resist racist violence. The AMI became attractive to them as an alternative to respectability politics and drew upon …

Slaying The Windigo: Fear And Faith In The Anthropocene, Daniel J. Irwin

Graduate Student Theses, Dissertations, & Professional Papers

This thesis examines the changing affect of fear in the environment and how it is influencing writing in the Anthropocene. Chapter one lays the groundwork for the present moment of ecocriticism, examining how the relationship with the environment has changed throughout the history of ecocritical writing. The second chapter examines how fear has been an intrinsic element of environmental storytelling, starting with the romantic ideas of the sublime. With the recognition of the impact that humanity has had on Earth over the past several centuries, and the accelerating acceptance of the idea of the Anthropocene since the turn of the …

Evaluating The Accuracy Of Stature Estimation From Tibial Radiographs Using Known And Newly Developed Regression Formulas, Atlantis Kae Baron

Graduate Student Theses, Dissertations, & Professional Papers

This study assesses the accuracy of stature estimation from tibial radiographs using digital measurements as an alternative to traditional osteometric tools. Stature estimation is crucial in forensic anthropology for identifying individuals, especially cases involving skeletal remains. Traditional methods rely on physical measurements and established regression formulas, such as those by Trotter & Gleser (1958).

This research analyzed tibial radiographs from the Forensic Anthropology Skeletal Trauma (FAST) database with ImageJ software to measure tibial lengths digitally. The sample included 59 tibiae, with measurements compared against three regression formulas; Trotter & Gleser (1958), Simon et al. (2023), and a new regression formula …

College Athlete Workload Management To Improve Performance, Brody Reid

Graduate Student Theses, Dissertations, & Professional Papers

Load management is an often used and misunderstood term within the realm of sport science. It has been described as the reason behind numerous soft tissue injuries as well as being the reason star athletes sit on the bench for games. This review aims to synthesize the existing literature regarding the workload management paradox within sport. Seminal work in this topic has been gathered mostly by Tim Gabbett in the paper “The Injury Prevention Paradox” where a relationship between fitness gain and fatigue accrued is outlined. This theory was first proposed by Roger Bannister in 1975. This paper …

Linking Empirical Data And Numerical Simulation To Characterize Dynamic Fire Behavior Associated With Interacting Firelines, Marta Sergeevna Jerebets

Graduate Student Theses, Dissertations, & Professional Papers

Understanding fuel pattern-fire process relationships is key for predicting fire behavior and effects with follow-on benefits to proactive fire management and model validation. To characterize dynamic fire behavior, this thesis leverages empirical data and numerical simulation through two complementary studies.

In the first study, longwave thermal sensors aboard unmanned aerial systems (UAS) were used to capture fine-scale fire behavior in two experimental grass burns. A novel paired design was used to quantify the effects of fuel arrangement on fire behavior with 3.66 m diameter treatments cut to a height of 0.15 m. The treatments ephemerally reduced fire rate of spread …

Understanding The Factors That Influence University Environment: Gender Differences In Perceptions Of Female And Male Stem Graduate Students., Rachel Robinson

Graduate Student Theses, Dissertations, & Professional Papers

Despite increasing female representation in higher education, women remain underrepresented in STEM (science, technology, engineering, and mathematics) fields. This thesis investigates gendered perceptions of university environment among STEM graduate students, focusing on the role of faculty-student interaction as a form of social capital. The survey was developed and administered with Qualtrics Online Survey Software by members of the Social Science Research Group of the Pacific Northwest Circles of Success: Mentoring Opportunities in STEM. All graduate students in the participating universities pursuing master’s and doctoral degrees in a National Science Foundation STEM recognized program were eligible to complete the survey. Using …

Bridging The Gap Between Plot-Level And Landscape-Scale Analysis For Wildfire Risk Assessment, Vanessa Leigh Niemczyk

Graduate Student Theses, Dissertations, & Professional Papers

Remote sensing technology has advanced greatly over the past couple of decades proving its ability to aid in wildfire risk assessment and improve our understanding of forest structure and fuel inventory across the landscape. While some aerial and satellite sensors perform better than others, they all have a common weakness, their reduced ability to capture understory fuels with high detail. Terrestrial laser scanning is an emerging solution due to its understory perspective. This research leverages the beneficial aspects of both terrestrial laser scanning and various aerial- or satellite-based remote sensing platforms (aerial laser scanning, digital aerial photogrammetry, and Sentinel-2) to …

Reinventing The Concepts Of Group And Isomorphism In Abstract Algebra, Chrisitan José Lopez-Mercado

Graduate Student Theses, Dissertations, & Professional Papers

This study explores the reinvention of the concepts of group and isomorphism in abstract algebra through design-based research. It investigates how students can reinvent these concepts and how mathematical artifacts transform their mathematical reasoning during the reinvention process. The study identifies a reinvention ecology comprising three interrelated components: students' mathematical activity, social interaction, and the continual emergence of mathematical artifacts. Using the guided reinvention principle of realistic mathematics education, students engaged with contextual situations, such as a 12-hour analog clock and the symmetries of an equilateral triangle, to progressively develop structural observations, formalize group axioms, and assemble them into the …

Examining Coinfections With Human Cytomegalovirus, Christopher Samuel Peterson

Graduate Student Theses, Dissertations, & Professional Papers

Human cytomegalovirus (HCMV) is the largest of any human virus, both physically at up to 300 nm in diameter, and as a genome, with its 235 kbp DNA genome with at least 165 open reading frames. It is also the number 1 non-genetic cause of birth defects and has a global prevalence rate of just over 80%. Despite these characteristics, it is not as well known to the general public as some of the other human herpesviruses, such as herpes simplex or varicella-zoster virus. Like other herpesviruses, HCMV can establish latency, leading to a lifelong infection for its host with …

Investigating The Impact Of Aerial Firefighting On Rate Of Wildfire Spread, Lindsay Ann Wiard

Graduate Student Theses, Dissertations, & Professional Papers

Aerial retardant drops are widely used in wildfire suppression, yet their effectiveness in slowing fire spread remains difficult to quantify at scale. This study evaluates the impact of aerial suppression on wildfire rate of spread (ROS) using a modeling framework that incorporates both observed (real) and counterfactual (synthetic) drop locations from a sample of 62 wildfires in Oregon. Synthetic drops were generated to simulate a no-suppression baseline, allowing us to compare changes in ROS in the presence and absence of suppression. We trained two random forest classifiers: one using both real and synthetic drops (the full model), and another using …

Advancing Wildfire Science Through The Application And Parametrization Of Process Based Fire Models, Anthony Albert Marcozzi

Graduate Student Theses, Dissertations, & Professional Papers

Computational models of wildfires are an important tool for fire managers and scientists. However, representing fuel inputs with sufficient detail for process-based fire models to accurately reflect observed fire phenomena while remaining computationally tractable is a major challenge. This dissertation advances wildland fire science by applying and parametrizing such models to investigate complex fire-fuel interactions across multiple scales.

A primary contribution addresses fine-scale fuel characterization through a novel voxel-based technique converting Terrestrial Laser Scan (TLS) point clouds into three-dimensional (3D) fuel representations. This method was evaluated by comparing simulated fire behavior in the Fire Dynamics Simulator (FDS), optimized using the …

Depth Distribution Of Liquid Water In Greenlands Firn Layer Based On L-Band Radiometry, A Snow Physics Model, And Machine Learning, Taylor D. Moon

Graduate Student Theses, Dissertations, & Professional Papers

The accurate estimation of the amount of meltwater retained by Greenland’s firn layer and its distribution over depth is essential for assessing both the current and future mass balance of the Greenland Ice Sheet. When meltwater infiltrates the firn, it exists as a quantifiable volume of liquid water, measurable as the one-dimensional liquid water amount, hereafter referred to as LWA. A promising new tool for estimating LWA is L-band passive microwave satellite radiometry, which can provide twice-daily estimates using empirical models of firn microwave emission. However, this method faces two primary limitations. First, retrievals are untested against field observations and …

Investigating Non-Invasive Survey Methods And Building A Predictive Occupancy Model For Harlequin Ducks (Histrionicus Histrionicus) In Western Montana And Northern Idaho, Holli Ann Holmes

Graduate Student Theses, Dissertations, & Professional Papers

Harlequin Ducks (Histrionicus histrionicus; HADU) are an imperiled sea duck that breeds along white-water mountain streams, but challenges in surveying them have made it difficult to understand population trends in their Northern Rocky Mountain breeding population. In this study we had two objectives: (1) evaluate non-invasive survey methods for detecting HADU on their breeding grounds in Western Montana and Northern Idaho, and (2) develop an occupancy model to predict potential breeding stream use for HADU across the region. First, we assessed the efficacy of ground-based foot surveys (GBS), environmental DNA (eDNA), and camera traps to detect breeding HADU during …

Changes In Efficiency And Magnitude Of Recharge Due To Climate Change For Headwater Catchments In The Mountain West, Harrison Mcgillen

Graduate Student Theses, Dissertations, & Professional Papers

Changes to groundwater recharge and stream flow were simulated from downscaled CMIP6 global climate models in a headwater catchment of the Blackfoot River, MT. A calibrated, 3-D, coupled surface and groundwater GSFLOW model, forced with minimum and maximum temperature, and precipitation from a downscaled CMIP6 simulation was used to quantify groundwater recharge and stream flow. The model was calibrated against measured groundwater head and stream flow using observed temperature and precipitation boundary conditions. The calibrated model was then forced with downscaled temperature and precipitation from the CANESM5 model for the SSP245, 370 and 585 scenarios, as well as a manual …

Impacts Of Fire-Driven Vegetation Changes On Evapotranspiration In North American Boreal Forests, Tyler Glen Albrethsen

Graduate Student Theses, Dissertations, & Professional Papers

A growing body of evidence suggests that land cover change could be impacting evapotranspiration (ET) trends more than the direct impacts of climate change (Dashti et al., 2022; Zhang et al., 2015). In boreal forests, one of the Earth’s most important carbon sinks (Kang et al., 2006), climate and disturbance-driven land cover change is progressing rapidly, threatening the resilience of conifer-dominated forests (Baltzer et al., 2021; Massey et al., 2023). The spread of deciduous trees and the changing structure of boreal forests likely have large implications for the magnitude and seasonality of ecosystem water fluxes (Young-Robertson et al., 2016). This …

Mapping Mesic Resilience In Western Rangelands: Productivity Trends, Predictors, And Targeting Frameworks, Kristopher Robert Mueller

Graduate Student Theses, Dissertations, & Professional Papers

Mesic ecosystems in riparian areas and wetlands make up only 2% of western U.S. rangelands but support 80% of wildlife during dry periods, providing vital late-season forage and refuge when surrounding uplands dry out. Yet, mesic habitats are often overlooked in landscape-scale conservation planning. This thesis addresses two key gaps: understanding how mesic productivity responds to environmental change and developing frameworks to incorporate these habitats into current conservation strategies. Using 40 years of Landsat imagery (1984–2024), we examined long-term trends in late-season mesic vegetation productivity and its relationship with drought across the sagebrush biome. From 1984 to 2004, mesic productivity …

Refining Population-Level Measures Of Early Childhood Vaccination Coverage Using National Immunization Survey-Child Data, Alexandria Nicole Albers

Graduate Student Theses, Dissertations, & Professional Papers

Background: From 2011-2021, the U.S. Advisory Committee on Immunization Practices (ACIP) recommended 10 vaccine series by age 24 months, with guidelines for minimum vaccination age, maximum age for rotavirus vaccination, minimum dose intervals, and a catch-up schedule for delayed series initiation. National vaccination surveillance evaluates series completion based on whether children received the recommended number of doses, including a combined 7-vaccine metric (completed seven series collectively). However, this approach overlooks: 1) vaccinations given too early, too late, or too close together, 2) catch-up schedule vaccinations, and 3) completion of all 10 recommended vaccines.

Purpose: To refine national childhood vaccination coverage …

Binoculars To Bytes: Development And Field Validation Of An Ai-Driven System For Avian Monitoring, Christian J. Dupree

Graduate Student Theses, Dissertations, & Professional Papers

Autonomous camera-trap arrays coupled with artificial-intelligence (AI) vision can lift bird monitoring beyond the spatial, temporal, and labor limits of traditional field surveys. We present Binoculars to Bytes (B2B), an open-source pipeline that turns 180–360° time-lapse imagery into analysis-ready avian data. At Freezout Lake Wildlife Management Area (Montana, USA) the system ran four-hour morning deployments during spring and fall migrations (2023–2024). A YOLO-NAS detector, incrementally refined with a “Specialized Localized Iterative Model” workflow, quadrupled local accuracy and, after confidence-based species-binning, cut false-positive rates in half. Daily AI species lists were benchmarked against contemporaneous eBird citizen-science checklists and recovered ≥ …