Digital Commons Network^™

High-Fidelity Surface And Environment Simulation Using Immersive Virtual Reality For Lunar Analog Training, Shriya Pedaparthi

Theses and Dissertations

The study explores the integration of high-fidelity Virtual Reality (VR) into astronaut training for lunar analog missions. A realistic VR simulation was developed to represent lunar terrain, allowing participants to perform critical tasks under simulated lunar conditions. Specifically, participants navigated from a compromised lunar habitat (ILMAH) facing a pressure breach, to a secure facility, testing their ability to respond effectively to emergency scenarios. Participants underwent three sequential trials to assess how VR and physical constraints influence gait and performance: (1) a baseline trial measuring natural gait without equipment; (2) a trial incorporating a real spacesuit and lunar gravity simulated through …

Comparative Study Of Robotic And Manual Welding For Energy Consumption And Efficiency In A High Mix, Low Volume Manufacturing Environment, John Ruprecht

Theses and Dissertations

This study examines the comparative efficiency and energy consumption of manual versus robotic welding in high-mix, low-volume (HMLV) manufacturing environments. Traditional robotic welding systems have been predominantly used in low-mix, high-volume production due to their efficiency in repetitive tasks. However, the advent of collaborative robots (cobots) has democratized robotic automation for diverse manufacturing needs. Cobots allow flexibility in programming, enabling their deployment in HMLV environments characterized by hard product variety and smaller batch sizes. This research evaluates energy consumption, welding speed, and quality metrics across manual and cobotic welding systems. Data were gathered using energy meters and video analysis, focusing …

Integrating Seismic Attributes And Machine Learning For Accurate 3d Petrophysical And Geomechanical Modeling In Shale Plays, Rasaki Olaide Salami

Theses and Dissertations

The increasing reliance on shale plays for hydrocarbon production necessitates accurate 3D petrophysical and geomechanical models to optimize resource recovery. However, conventional methods struggle with shale reservoir complexities such as low permeability, anisotropy, and data heterogeneity, leading to uncertainties in property predictions. This dissertation integrates seismic attributes with machine learning (ML) techniques, including Long Short-Term Memory (LSTM) networks, Temporal Convolutional Networks (TCNs), and Wasserstein Generative Adversarial Networks with Gradient Penalty (WGAN-GP), to enhance predictive accuracy.LSTMs and TCNs effectively capture temporal dependencies, while WGAN-GP generates high-quality synthetic data to mitigate data scarcity. The study critically evaluates existing 3D modeling methodologies, identifying …

Experimental And Numerical Modeling For Co2 Utilization In Enhanced Oil Recovery And Associated Storage In Unconventional Reservoirs, Billel Sennaoui

Theses and Dissertations

Unconventional reservoirs, such as the Bakken and Three Forks formations, present significant challenges due to their ultra-low permeability and complex fracture networks, which limit primary oil recovery to less than 10%. To enhance hydrocarbon extraction while simultaneously facilitating carbon dioxide (CO₂) storage, this study investigates the mechanisms governing CO₂ Huff-n-Puff (HnP) and associated storage under various operational conditions. A comprehensive approach integrating experimental analysis, numerical simulations, multiphase flow modeling, and geochemical interactions is employed to optimize CO₂-EOR and storage strategies. The experimental phase focuses on evaluating the performance of different injected gases (CO₂, ethane, and propane) in the Upper Three …

Forceful Functors: A Categorical Approach To Constraint Monitoring In Machine Learning Models, Jonathan Wirkkala

Theses and Dissertations

Often times in machine learning there are several heuristic choices that one makes during model selection, training, and validation. These choices include the type of training used, the width and depth of the model, type activation function and many more. These choices are general rules of thumb and best practices when creating a machine learning algorithm to achieve acceptable results. For example, in the case of image processing, this may mean determining whether or not a given image contains a tumor. Decisions made during the design process create several variations of machine learning algorithms, all with various properties with pros …

Digital Orthodoxy And Political Populism In Eastern Europe: How Orthodox Media Facilitate Political Mobilization, Dmytro Garaschuk, Oleh Sokolovskyi

Occasional Papers on Religion in Eastern Europe

This article examines the intersection of Orthodox digital media and political populism in Eastern Europe, focusing on how religious institutions utilize digital platforms to facilitate political mobilization, reinforce nationalistic narratives, and undermine democratic institutions. Drawing on a comparative analysis of six countries–Russia, Ukraine, Romania, Serbia, Georgia, and Montenegro–the study identifies a shared ideological matrix that fuses populist rhetoric with theological motifs. The research highlights the strategic use of digital media by Orthodox actors to construct moral binaries, sacralize political resistance, and disseminate disinformation framed in religious language. Particular attention is given to the role of the Russian Orthodox Church and …

Spatiotemporal Patterns Of Desertification Sensitivity And Influencing Factors Across The Western Inner Mongolia Plateau, China, Yang Chen, Long Ma, Xixi Wang, Tingxi Liu, Zixu Qiao

Civil & Environmental Engineering Faculty Publications

Desertification remains a critical global ecological and environmental challenge that threatens sustainable development. Although our understanding of desertification dynamics and their underlying drivers has improved, continued research is needed due to the region-specific nature of these processes. This study focuses on the Western Inner Mongolia Plateau in China as a case study to examine the evolution of desertification and its driving factors using a multifaceted approach, including the Mediterranean Desertification and Land Use (MEDALUS) model. Results show that the desertification sensitivity index (DSI) across the plateau ranged from 1.12 in prairie regions to 1.87 in desert areas, with a spatial …

A Global Application Programming Interface-Enabled Earthquake Ground Motion Relational Database For Engineering Applications, Tristan E. Buckreis, Chukwuebuka C. Nweke, Pengfei Wang, Scott J. Brandenberg, Maria E. Ramos-Sepúlveda, Rashid Shams, Shako Mohammed, Renmin Pretell, Silvia Mazzoni, Paolo Zimmaro, Jonathan P. Steward

Civil & Environmental Engineering Faculty Publications

We present a application programming interface (API)-enabled relational database of global earthquake ground motion intensity measures, associated metadata, and processed time-series data. Raw ground motion records were processed by the authors using either manual or semi-automated processing procedures, and every processed record has passed a quality review by a trained analyst. Computed intensity measures include peak acceleration and velocity, pseudo-spectral acceleration response spectra, cumulative absolute velocity, Arias Intensity, and Fourier amplitude spectra. The processed time-series data, associated metadata, and ground motion intensity measures were organized into a web-served relational database consisting of 32 tables connected by primary/foreign key pairs. Ground …

The Bioremediation Of Nutrients And Heavy Metals In Watersheds: The Role Of Floating Treatment Wetlands, Nirmal Kumar, Bhupinder Singh, Yuanze Chen, Abishek Kafle, Ram L. Ray, Sandeep Kumar, Xiaonan Shan, Venkatesh Balan

Civil & Environmental Engineering Faculty Publications

Floating treatment wetlands (FTWs) are engineered systems that utilize floating platforms planted with aquatic vegetation to treat polluted water such as stormwater, agricultural runoff, and wastewater. FTWs have emerged as promising and environmentally sustainable solutions for water purification. This review synthesizes the current knowledge on FTW design, plant selection, and performance evaluation. It highlights key factors influencing nutrient and heavy metal removal, including the hydraulic retention time, mat thickness, and types of plant species. Recent findings on the roles of root architecture, microbial interactions, and seasonal variability in treatment efficiency are also discussed. Additionally, the review explores advanced analytical methods …

Laboratory Investigation Of Shape And Initial Orientation Effects On Surf Zone Object Migration, Temitope E. Idowu, Jack A. Puleo

Civil & Environmental Engineering Faculty Publications

Discarded objects like munitions in marine environments pose public safety risks. The behavior of various density objects deployed at four cross-shore positions in the surf zone of a large-scale 120 m x 5 m x 5 m wave flume were observed under different forcing conditions. Net migration was predominantly directed offshore, with approximately 70 % offshore migration observed near the outer surf zone. Density, shape, and initial orientation were identified as important to object behavior, with density acting as the dominant driver in 67 % of the object pairing scenarios. The influence of shape and initial orientation on net migration …

Sustainable Management Of Erosive Shores: An Interdisciplinary Approach Integrating Engineering And Social Sciences At A Tide-Dominant Beach Area, Jun Ik Sohn, Hyun Dong Kim, Kiran Adhithya Ramakrishnan

Civil & Environmental Engineering Faculty Publications

This study investigates the causes and consequences of shoreline erosion at Kkotji Beach, a prominent tourist destination on the west coast of South Korea, where the degradation of the coastal environment has increasingly threatened the local tourism industry and economy, by employing a mixed-methods approach that combines field observations with MIKE 21 hydrodynamic simulations and by integrating perspectives from coastal engineering and the social sciences to develop practical, site-specific strategies for mitigating erosion, enhancing public awareness, and promoting sustainable coastal planning and development that support long-term environmental resilience and economic stability. The results show that dominant ebb currents drive southward …

Improving The Psychosocial Work Environment To Prevent Sickness Absence And Turnover In Nurses: A Systematic Review, Laurent Corthésy-Blondin, Alessia Negrini, Samantha Vila Masse, Christine Genest

Revues de littérature, synthèses de connaissances

In nurses, the high rates of sickness absence (SA) and turnover generate staggering costs. Their prevalence could be reduced by acting on the work-related psychosocial factors (WRPFs) that can impact the mental health of nurses and lead to their absences and departures. However, there is a lack of consensus regarding the effectiveness of interventions that target WRPFs from a SA and turnover prevention perspective. This systematic review aims to identify interventions that target WRPFs to reduce SA and turnover in nurses, describe the methods used to evaluate their effectiveness, and report on their effectiveness at improving SA, turnover rates, and …

Design And Fabrication Of Tpms-Based Bone Scaffolds: A Cost-Effective Approach Using Plga-Nha And 3d-Printed Pva Molds, Yasser Ahmed

Theses and Dissertations

This thesis introduces a new cost-effective method for fabricating bone scaffolds from triply periodic minimal surface (TPMS) geometries—namely Gyroid and Diamond structure—using a poly(lactic-co-glycolic acid)-nanohydroxyapatite (PLGA-nHA) composite and 3D-printed polyvinyl alcohol (PVA) molds. Current TPMS scaffold fabrication techniques depend on costly laser-based techniques like selective laser sintering and thus remain inaccessible. Herein, we reveal a cost-effective and repeatable indirect approach via fused deposition modeling (FDM) for printing water-soluble PVA molds, which are then iteratively cast filled with a PLGA-nHA solution. The protocol was optimized through concentration modulation and controlled evaporation of the solvent for optimum infiltration and uniformity in the …

Stem Professors’ Motivation To Engage In A College Teaching Certificate, Justin Craig Alexander

Theses and Dissertations

Despite an expanded focus on educating students in STEM disciplines, nearly half of U.S. college students who enroll in these degree programs fail to graduate (Hamm et al., 2020, p. 623). Critics sometimes blame pedagogically untrained faculty (e.g., Kahn, 2022). This Dissertation in Practice (DiP) focused on STEM university faculty's motivation for teaching and whether professors are motivated to enroll in pedagogy courses. Via the lens of self-determination theory (SDT), this DiP examined to what extent STEM faculty at a major research university in the upper Midwest could devote additional time to pedagogy by enrolling in a college teaching graduate …

Concept Application Of Active Magnetic Bearing Technology For Offshore Horizontal Axis Wind Turbines, Isaac Ansah

Theses and Dissertations

Wind energy continues to lead the global transition to renewable power, driven by its minimal environmental impact and high scalability. Offshore wind farms benefit from stronger and consistent wind resources. However, these advantages are tempered by challenges related to installation, maintenance, and drivetrain reliability. Conventional bearings, which support the drivetrain system, are prone to wear related failures due to lubrication breakdown and mechanical fatigue from continuous loading. This study explores the integration of Active Magnetic Bearings as an alternative to conventional bearings in offshore Horizontal Axis Wind Turbines. Using advanced engineering simulation tools, the main driveshaft of a 130 MW …

Exploring The Experiences Of First-Year Pre-Nursing Students’ Sense Of Belonging In A Living-Learning Community And First-Year Seminar, Robyn Bancroft

Theses and Dissertations

Many factors may influence how a student experiences their first year adjusting to college life. The University of North Dakota, a public research institution located in Grand Forks, ND, recently implemented a nursing living-learning community (LLC) comprised of first-year, pre-nursing students, which also required the students to take a one-credit first-year seminar (FYS) together, known as UNIV 101 – Introduction to University Life. A total of 10 participants who resided within this living-learning community for a minimum of one academic year and were enrolled in the same section of UNIV 101 during their first semester submitted reflection papers. Additionally, eight …

Precipitation Forecast And Verification For Suas Applications, Patrick Britt

Theses and Dissertations

Small Unmanned Aerial Systems (sUAS) have become a fast-growing part of air traffic in the United States. This significant growth is due to the numerous uses these systems can provide, both recreationally and professionally. Due to the small nature of the sUAS, any weather, regardless of intensity, plays a vital role in flight operations and planning. In a survey of sUAS pilots, it was found that precipitation was the most significant hazard of concern, and the most time-sensitive hazard, as precipitation conditions are most often checked by operators in the immediate moments before flight. This project aimed to create, analyze, …

Hillslope Degradation: Coarse Sands May Move Faster But Fines Dominate Flux, Robert Chance

Theses and Dissertations

Hillslopes are one of the most pervasive landforms on Earth yet the details of the processes that drive their evolution are not completely understood. Excluding boulders, the majority of mass and volume in soil-mantled hillslopes is composed of sand-sized and finer grains. Understanding the transport rates and governing transport mechanisms of these grains is therefore key to advancing our knowledge of hillslope evolution.This research investigates sand-sized sediment transport through field experiments at 20 sites tracking surface sediment motion and 11 sites measuring depth-dependent transport. These empirical results are compared against outputs from a novel grain-based hillslope diffusion simulation (GBHDS), which …

Predictive Modeling For Multiphase Flow Boiling Heat Transfer By Integrating Computational Fluid Dynamics And Machine Learning Approaches, Mohamed Elfaham

Theses and Dissertations

The heat transfer process in multiphase flow systems becomes essential forindustrial applications and when phase change occurs. The heat transfer coefficients become more efficient during boiling and condensation processes when compared to single-phase fluid flow. The design of thermal systems requires knowledge about these coefficients together with their essential parameters. This study evaluates flow boiling heat transfer coefficients for low-global warming potential refrigerants which include pure ethanol and propane (R-290) and R- 600 and R-600A. The experimental database included more than 25 independent studies that covered various operating conditions and channel sizes and fluid properties. Existing empirical correlations were evaluated, …

Computational Prediction Of Hemolysis In Laminar Non-Newtonian Fluid, Nasim Gholizadeh

Theses and Dissertations

Hemolysis, the rupture of red blood cells (RBCs), is a critical concern in blood-circulating devices, requiring accurate predictions to ensure patient safety. This study investigates the sensitivity of hemolysis predictions to variations in viscosity models and hemolysis coefficients under complex flow conditions. Computational Fluid Dynamics (CFD) simulations were conducted using Ansys Fluent and OpenFoam on identical meshes with the FDA benchmark nozzle model. Under laminar flow conditions, CFD frameworks accurately predicted global variables, but variations in derived quantities, such as strain rate and vorticity, emerged due to differences in numerical solvers and gradient evaluation methods. These variations affected predictions of …

Laboratory Application Of An Aircraft Particle Imaging Probe To Characterize Levitated Ice Crystals And Their Aerodynamic Drag, Cheyenne Phoenix Harrison

Theses and Dissertations

Ice crystals in the upper atmosphere range in size from a few nanometers to a few millimeters, creating potential damage to vehicles traveling at hypersonic speeds; this problem has not yet been investigated with controlled laboratory techniques. This thesis investigates ice crystal impacts on high-speed flight vehicles and their aerodynamics by exploring a new method to combine ice crystal and shock wave experimental apparatuses to achieve experiments of observing ice crystals and shock waves interacting. The objectives of this research are: (1) to consistently produce levitated ice crystals in a setup that can feasibly release the ice crystals into a …

Assessment Of Medical Laboratory Science Student Motivation And Perceived Transfer Of Knowledge Towards Information Literacy, Shannon Jongeward

Theses and Dissertations

Information literacy skills are a cornerstone of higher education as they allow students to effectively locate, evaluate, and utilize information from various sources. Evidence-Based Practice, a process commonly used in healthcare for decision making, incorporates using the best available research, one’s clinical expertise, and the patient’s values. Information literacy is foundational to developing evidence-based practice skills. Medical Laboratory Scientists (MLS) utilize evidence-based practice to assist in making decisions about clinical laboratory tests and processes to ensure quality in testing and the appropriate use of resources; therefore, it is important for MLS programs to include elements of evidence-based practice into their …

Doctoral Student Mentoring: A Quantitative Analysis Of Faculty And Student Perceptions And Expectations, Laura Margaret Look

Theses and Dissertations

Doctoral student success is heavily influenced by the quality of mentoring and advising relationships with graduate faculty, yet doctoral student completion rates remain at a low rate of around 50%. The purpose of this quantitative study was to examine the mentoring relationships of doctoral students by surveying doctoral students and graduate faculty who mentor graduate students to identify their expectations for the mentor and mentee in the mentoring relationship. Data were collected from 155 students and 68 faculty in the spring 2024 semester at the University of North Dakota, a Midwest R2 institution. Nonparametric statistical analysis revealed several misalignments between …

Extreme Environment Tribological Studies Of Multifunctional Materials, Matt Malusky

Theses and Dissertations

This research examines polymer wear behaviors across polyether-etherketone (PEEK) and polylactic acid (PLA) composites in varying environmental conditions. Tribological investigations of ceramic and intermetallic coatings are explored in the context of material selection for lunar operation. In the first study, PEEK composites incorporating ternary nanolaminate ceramics, termed MAB and MAX phases, were tested in varying temperature environments above and below their expected glass transition temperatures to evaluate their tribological performance in comparison to a non-reinforced PEEK substrate. Results showed that under ambient conditions, both MoAlB (MAB phase) and Cr2AlC (MAX phase) ceramics stabilize the friction coefficient compared to pure PEEK, …

Impact Of Resin Grinding On Per- And Polyfluoroalkyl Substance Adsorption In Rapid Small-Scale Column Tests, Tihitna Gezahegn Mulugeta

Theses and Dissertations

Per- and polyfluoroalkyl substances (PFAS) are persistent environmental contaminants with significant health risks. Among the different technologies for PFAS removal, adsorption is preferable due to low-cost, operational simplicity, and use of regenerable adsorbents. While pilot-scale fixed-bed columns are ideal for evaluating adsorption media, they are time- and resource-intensive. Rapid Small-Scale Column Tests (RSSCTs) offer a practical alternative, yet most studies have focused on granular activated carbon, with limited insight into ion exchange (IX) resins. Due to limited literature on the effect resin preparation on the performance of RSSCTs and their prediction accuracies are unexplored. This study investigates the effect of …

Chemical Looping As An Enabling Technology For Low-Carbon Energy Production, Junior Neguieh Domkam Nasah

Theses and Dissertations

Growth in global gross domestic product has historically been tied with high-carbon energy sources. Development of new low-carbon energy technologies is thus key to achieving a de-coupling of energy demand from economic growth. This dissertation evaluates the technical feasibility of a small-scale low-carbon solution referred to as Combined Hydrogen, Heat and Power (CH2P), a synthesis gas to hydrogen chemical looping process. The CH2P process is based on the steam-iron process and adopts multiple batch reactors to convert syngas in a two-step approach. First, the syngas is partially oxidized by reducing Magnetite (Fe3O4) to Wüstite (FeO) followed by complete oxidation in …

Student Participation In Informal Resolution: Examination Of Impact Factors On Recidivism And Student Perceptions Of Institutional Care And Fairness, Linnea Rose Nelson

Theses and Dissertations

This exploratory case study, conducted at the University of North Dakota (UND), examined factors influencing recidivism and student perceptions of institutional care and fairness among participants in the piloted Informal Resolution (IR) option. A restorative justice (RJ)-informed alternative to the traditional student conduct process, the IR is offered to students charged with first-time, low-level violations of UND’s code of conduct. This study aimed not only to evaluate the new process but also to respond to recent calls from scholars and practitioners for more extensive research on the intersection of RJ and student conduct outcomes. Sherman’s (1993) defiance theory provided the …

From Theory To Practice: Addressing The Operational Challenges Of School Principals, Darin Murry Scherr

Theses and Dissertations

School principals play a crucial role in the effectiveness of educational institutions, yet many enter leadership positions lacking adequate preparation for operational responsibilities. This Dissertation in Practice examines the challenges principals face in managing financial, staffing, and facility operations and the impact of these challenges on principal retention. Using a qualitative multiple-case study approach, the research investigates the experiences of new and veteran principals within Bismarck Public Schools to identify gaps in their operational preparedness.Findings highlight five key themes: (1) gaps in financial and budgetary training, (2) the role of mentorship and support systems, (3) balancing instructional leadership with operational …

Synthesis And Characterization Of Silicon-Containing Ternary Transition Metal Borides For High Performance Applications, Godswill Ngige

Theses and Dissertations

Binary borides are well known for their exceptional mechanical and thermal properties, including high strength, high melting points, outstanding hardness, and excellent chemical stability, making them suitable for high-temperature structural applications such as components in hypersonic vehicles, jet engines, nose cones, and the leading edges of aircraft. Despite these advantages, they are inherently brittle and suffer from low fracture toughness, limiting their ability to absorb impact or resist crack propagation.

To this end, attention shifted to ternary transition metal borides which are materials composed of a transition metal, boron, and a third element. These ternary compounds exhibit a broader range …

Which University Faculty Are Successful Researchers? Developing And Testing Measures Of Research Competence To Predict Faculty Research Motivation And Success, Muhammad Salahuddin

Theses and Dissertations

University faculty play a pivotal role in producing research that leads to positive social change through the creation of new knowledge, enhancement of higher education quality, and improved university rankings. Faculty produce more when they feel competent, autonomously motivated, and acknowledged. Past studies have measured faculty research competencies using self-report scales that may contain biases, potentially leading to significant discrepancies in research outcomes. My program of research – a three-article dissertation – aimed to develop and validate the test-based measures of faculty research competence that can more reliably predict faculty research success. The three studies provide an enhanced understanding of …