Now showing items 1-20 of 13504

    • Solar wind driving of the cross polar cap potential: a new outlook on the saturation problem with a data-driven approach

      Itani, Pralhad; Ozturk, Dogacan Su; Truffer, Martin; Reddy, Amani (2024-08)
      The cross polar cap potential (CPCP) serves as an indicator of the energy flow into the magnetosphereionosphere system and can saturate during geomagnetic storms as the solar wind electric field increases. In this project, we investigated the uncertainties in the cross polar cap potential saturation problem by examining the differences in its estimation from different sources. We first focused on the relationship between the CPCP from different sources and their relationships with SuperMAG Auroral Electrojet (SME) and Auroral Electrojet (AE) indices to try and find different distributions. We then tried to find the relationship between CPCP values with solar wind parameters using linear regression, random forest, and multi-layer perceptron models. The parameters we use are Interplanetary Magnetic Field (IMF) components, plasma, geomagnetic index data from the OMNI database, and the SuperDARN Mapex CPCP dataset with data from 2000 to 2020. Our work showed that the CPCP has the highest Pearson correlation coefficient with the velocity, magnetic field magnitude and its vertical component, and the month compared to other drivers. Among all the models we developed, the Random Forest model performed significantly better compared to traditional regression algorithms, like Ridge, Lasso, and Elastic Net. On the basis of all model performances Neural network performed better than the Random Forest regression model with a Pearson correlation coefficient of 0.92. Similarly, the model performances displayed the same behavior for CPCP estimations made from the Polar Cap Index, however, the Pearson correlation coefficients between the predictions and actual values were higher at 0.96 for both hemispheres. Combined with the CPCP behavior for different geomagnetic activity levels, the prediction models can help shed light on the CPCP saturation problem, especially during the presence of large data gaps of external solar wind driving.
    • Adaptive mesh refinement for variational inequalities

      Fochesatto, Stefano; Bueler, Ed; Faudree, Jill; Maxwell, David (2024-11)
      Variational inequalities play a pivotal role in a wide array of scientific and engineering applications. This project presents two techniques for adaptive mesh refinement (AMR) in the context of variational inequalities, with a specific focus on the classical obstacle problem. We propose two distinct AMR strategies: Variable Coefficient Elliptic Smoothing (VCES) and Unstructured Dilation Operator (UDO). VCES uses a nodal active set indicator function as the initial iterate to a time-dependent heat equation problem. Solving a single step of this problem has the effect of smoothing the indicator about the free boundary. We threshold this smoothed indicator function to identify elements near the free boundary. Key parameters such as timestep and threshold values significantly influence the efficacy of this method. The second strategy, UDO, focuses on the discrete identification of elements adjacent to the free boundary, employing a graph-based approach to mark neighboring elements for refinement. This technique resembles the dilation morphological operation in image processing, but tailored for unstructured meshes. We also examine the theory of variational inequalities, the convergence behavior of finite element solutions, and implementation in the Firedrake finite element library. Convergence analysis reveals that accurate free boundary estimation is pivotal for solver performance. Numerical experiments demonstrate the effectiveness of the proposed methods in dynamically enhancing mesh resolution around free boundaries, thereby improving the convergence rates and computational efficiency of variational inequality solvers. Our approach integrates seamlessly with existing Firedrake numerical solvers, and it is promising for solving more complex free boundary problems.
    • Healing education, nurturing through writing: autonomic & somatic nervous system social-emotional learning techniques for writing and their application in cultural translation

      Ezran-Young, Dafna Rica; Child, Robin; Hornig, Joan; Dershin, Caroline; Topkok, Sean Asikluk (2024-12)
      Alaska school districts have provided structured, district-led social-emotional learning since the 1990s. The Collaborative for Academic Social and Emotional Learning website showcases the Anchorage School District’s program, highlighting its standards and early initiatives as models for districts across the nation to emulate when developing and implementing their programs. Yet, K-12 social-emotional learning programs have failed to adequately support Alaskan students. Following the Covid-19 pandemic, two urban Alaskan school districts have adopted a supplementary strategy: they contract with outside agencies to provide mental health services on site at schools. Some schools have modified the social-emotional learning paradigm to increase cultural responsiveness or embed social-emotional learning in the academic curriculum. Because the writing process commonly generates fear, placing social emotional lessons in the writing curriculum provides reciprocal benefits. While, early on, social emotional learning programs modulated fear responses by regulating the autonomic nervous system preferentially via stillness or verbal expression, evidence-based techniques exist that activate the somatic nervous system in movement oriented, minimally verbal means for healing. Research by Bessel van der Kolk, Stephen Porges, Deb Dana, Peter Levine, Maggie Kline, and Kathlyn and Gay Hendricks has shown that somatic movements for coping with fear offer an effective supplement for nervous system regulation. Somatic techniques have a low threshold to participation and are collaborative, relationship-building, and minimally directive. Multiple communities’ traditional Jewish spiritual practices and philosophies act similarly, as do numerous Alaska Native pedagogies and epistemologies that have relied, for millennia, on similar theoretical principles. For novice teachers from outside Alaska, a Western social emotional learning model that includes somatic techniques may provide a bridging construct, allowing such teachers time to build cultural competence and adapt when they begin teaching in rural Alaskan communities as they develop an initial, general, culturally responsive pedagogical understanding.
    • A Comparative analysis of diversity statements in public and private higher education institutions

      Aquino, Andrew Julian; McDermott, Victoria; May, Amy; Brower, Pearl (2024-12)
      This study undertakes a comparative analysis of Diversity, Equity, and Inclusion (DEI) statements from public and private higher education institutions (HEIs) in the United States (U.S.). Employing qualitative thematic and comparative analysis, the research examines how these HEIs articulate and communicate their DEI commitments, with particular attention to the use of actionable language and communication strategies. Grounded in Social Change Theory, the study theorizes the potential role of DEI statements in fostering institutional transformation and advancing social justice. Guided by two primary research questions — (RQ1) What external factors are reflected in the language of the DEI statements of public versus private HEIs? and (RQ2) What do HEIs communicate to the public about their DEI statement on their respective institutional websites? — the study explores the influence of governance structures, political environments, and stakeholder expectations on the formulation and communication of DEI strategies. Through this analysis, the study aims to provide evidence-based recommendations for enhancing the effectiveness of DEI efforts in HEIs. In particular, the research focuses on the development of clearly defined, actionable goals and inclusive communication frameworks designed to foster accountability and catalyze social change. Ultimately, this contributes to the broader objective of promoting equity and inclusion in higher education, aligning institutional practices with the needs and expectations of diverse stakeholder groups.
    • Developing a deep learning model for detection of spontaneous combustion in open pit coal mines

      Juneja, Jatin; Ghosh, Tathagata; Fan, Long; Das, Arghya (2025-08)
      Spontaneous combustion in coal mines have been a concern for miners all over the world, particularly in China, the USA and India. If allowed to establish over a large area it can become a serious environmental concern. It is important to detect it at initial stages and isolate affected coal seam to quench fire. Monitoring combustion in spoil piles of abandoned and artisanal coal mines is even more difficult due to lack of access to regulating authorities. By using Deep Learning Neural Networks, Convolutional Neural Network models can be trained to detect spontaneous combustion. These scans can be made more frequently, and detection can be done at early stages. Training dataset consists of over 5000 images processed from different mines at different conditions. The dataset is processed using Python Libraries such as TensorFlow, NumPy and Pandas to develop three different models i.e. simple CNN, LeNet and AlexNet. Accuracy comparison shows that LeNet is the most suitable model giving accuracy of 97%. It was observed that selection of an appropriate dataset is more critical than selecting model architecture.
    • Hazard identification and analysis for equipment-related fatal incidents in the US underground coal mining

      Anthony, Ebenezer Kofi Boye; Ghosh, Tathagata; Fan, Long; Ahn, Il Sang (2025-08)
      This study investigates equipment-related fatal incidents in U.S. underground coal mining from 1993 to 2023, analyzing trends, causes, and the effectiveness of safety measures. Using data from the Mine Safety and Health Administration (MSHA), this study examined 205 fatalities linked to continuous miners, shuttle cars, roof bolters, load-haul-dump (LHD) vehicles, longwall systems, and hoisting equipment. A mixed-methods approach combines the quantitative analysis of accident trends with qualitative models, such as Failure Mode and Effects Analysis (FMEA) and Bowtie Analysis. The findings revealed that powered haulage and machinery accidents were the leading causes of fatalities, with mechanical failures (40%), human errors (28%), and hazardous environmental conditions (20%) being the primary contributors. Critical failures included hydraulic system breakdowns and conveyor malfunctions, whereas unsafe operating practices and fatigue were the dominant human factors. Summer and fall show elevated fatality rates driven by heat stress and production pressures. Regulatory reforms, especially the MSHA and Health Administration’s (MSHA) 2015 proximity detection mandates, have helped reduce fatality rates. However, risks remain due to inconsistent system maintenance and compliance issues. Emerging technologies, such as AI-driven hazard detection, real-time monitoring, and automation, hold promise but require integration with behavioral safety programs. This study proposes actionable recommendations, including stricter policy enforcement, predictive maintenance strategies, ergonomic equipment redesign, and simulation-based training. It emphasizes a systems approach that addresses mechanical, human, and environmental factors of the problem. By bridging theoretical hazard models with practical interventions, this study offers a data-driven framework for reducing fatalities. These insights are valuable for industry stakeholders, safety professionals, and regulators committed to improving mining safety and ensuring that technological progress translates into lives saved.
    • Gwich'in Athabascan storybook for primary classrooms: integrating Alaska native language and culture into language arts curriculum

      VanDyke, Lin; Royer, Samantha; Child, Robin; Hayton, Allan (2025-08)
      The problem addressed by this project is the lack of high-quality children’s literature that accurately embodies Alaska Native culture, specifically Gwich’in Athabascan culture, that can be used in primary classrooms. The significance of this topic is the need for materials that Alaska Native students can connect with on a personal level and that can create a greater understanding of Native culture for all individuals. The work was completed in July of 2025. The important implications of this project are the availability of an easy-to-use storybook and connected resources to read with students and have quality discussions about Athabascan language and culture.
    • Design and assembly of a low-cost active vacuum insulation automatic control system

      VanderHart, Micah; Peterson, Rorik; Marsik, Tom; Kim, Sun; Huang, Daisy (2025-08)
      Vacuum insulated panels (VIPs) are a developing type of insulation that use an airtight volume evacuated of air to achieve thermal resistivity values as high as ten times that of traditional insulation. One of the areas of use for VIPs is the building industry, but adoption is slow due to issues such as air leaks causing panel degradation over time, panel fragility, and the inability to customize VIP dimensions on-site. These issues have the potential to be solved by utilizing active VIPs, which have a vacuum pump permanently connected to them, allowing them to be periodically evacuated. The purpose of this project was to develop a low-cost and scalable automatic control system that can manage multiple panels while being suitable for future commercialization. The system uses a vacuum pump, a Raspberry Pi single board computer, a pressure sensor, and vacuum valves to measure and control the pressure in multiple active vacuum insulated panels. The control system also can detect punctures in a panel and isolate it from the rest of the system. Wider adoption of active VIPs can dramatically reduce the costs and energy consumption associated with building space heating and cooling.
    • The feasibility of transaldolase inhibitors as anti-cancer therapeutics

      Baer, Daniel Scot; Howard, William; Bult-Ito, Abel; Keller, John (2025-12)
      Metabolism was a major focus of cancer research 100 years ago, but its prevalence declined in the latter part of the twentieth century. In the last several decades, however, it has become clear that cancer cells frequently modify their metabolic programs to enable both their survival and rapid proliferation. Transaldolase (TA), an enzyme within the pentose phosphate pathway, contributes to these outcomes when its activity is increased, yet for a variety of reasons inhibition of the enzyme has remained comparatively understudied. Since TA flux enables nucleotide production and high levels of NADPH synthesis, aberrant, cancer-causing signaling pathways often increase expression of the enzyme or otherwise boost the flow of metabolites through its pathway branch. TA has also been found to take part in a synthetic lethality condition with the breast-cancer drug lapatinib, enabling the treatment to gain efficacy against otherwise drug-resistant cancer cells. TA’s neighboring enzyme on the same branch, transketolase (TK), whose reactions occur prior to and after TA’s reactions, also affects nucleotide and NADPH production, and unlike TA, drug-like inhibitors for TK have long been in existence. The recent development of a safer prodrug based on one such older TK inhibitor likely will impact developmental considerations of a TA inhibitor, as the effect of interfering with the latter’s reactions could prove somewhat redundant. Still, TA inhibition arguably will lead to distinct, potentially useful clinical effects on carcinogenesis compared to TK inhibition, reinforcing the rationale behind such research.
    • Can deep reinforcement learning help robots avoid unexpected obstacles?

      Lewis, Rachel; Lawlor, Orion; Das, Arghya Kusum; Chappell, Glenn (2025-12)
      As the utilization of deep reinforcement learning (DRL) for mobile robotics increases, it is vital to ensure that agents can navigate safely in their environments. As these robots are often costly and fragile, a key part of this task is examining path planning and collision avoidance. This project focuses on the behavior of several DRL agents such as Soft-Actor Critic (SAC) and Proximal Policy Optimizer (PPO) in dynamic environments, particularly with intermittent obstacles—those that may not always pose a threat to the agent. This project does not include training with agent sensors to detect moving hazards. Rather, this work was performed to determine if the agent can identify that a particular area could be hazardous based on past collisions and how it should behave there. To do so, development was done of a custom MuJoCo simulation environment with multiple prebuilt layouts that contained a variable number of obstacles. DRL agents were trained in this environment to explore the ways in which agents can respond to dynamic environments, determine how they view hazardous locations, and explore whether the agents make noticeable changes in their behavior and learning in these environments. Tests were also done regarding differing reward structures, such as sparse and dense rewards, to view how the amount of reward per step an agent receives impacts agent behavior and runtime in the environment. Overall, agents performed better in environments with fewer hazards and had better results with the dense reward structure. However, agents tended to linger near the goal, farming rewards until the last timestep, believed in part to be due to a lack of penalties for lingering in the space. Future angles of research, including more variables in reward structures and providing more data such as sensors to the agent for selecting actions, are discussed as well.
    • The musical implications of the personal relationships, political influences, and culture on seven composers for flute: Friedrich Kuhlau, Carl Reinecke, Franz Doppler, George Enescu, Eldin Burton, Jonathan Cohen, and Carlos Simon

      Weaver, Anne; McConnell, Sarah; McWayne, Dorli; Zilberkant, Eduard (2025-05)
      This project explores the influences of the personal relationships, political circumstances, and culture on the music of seven composers for flute: Friedrich Kuhlau, Carl Reinecke, Franz Doppler, George Enescu, Eldin Burton, Jonathan Cohen, and Carlos Simon, with a specific focus on eight pieces by these composers. Through this exploration it is apparent their music not only conveys their art but also embodies the composer's personal relationships, political circumstances, and culture.
    • Bayesian spacial process convolutions for geostatistical modelling

      Spehlmann, Michael; Short, Margaret; McIntyre, Julie; Goddard, Scott (2025-05)
      The declining rate of new metal discoveries, coupled with surging demand for critical minerals, underscores the need for improved geostatistical tools in early-stage exploration. Traditional fre- quentist methods like kriging are ill-suited for target generation due to their reliance on dense data, stationarity assumptions, and tendency to smooth anomalies. Meanwhile, exploration workflows remain largely qualitative, relying on geological intuition rather than probabilistic frameworks. A Bayesian spatial process convolution (SPC) model offers a promising alternative, leveraging hierarchical Bayesian formulations to model spatial processes with uncertainty quantification. This paper presents a Bayesian SPC model designed for geostatistical modeling, particularly in early-stage mineral exploration. The model is evaluated through simulations that mimic real-world geological complexity, including categorical boundaries and spatially coherent processes. The SPC model demonstrates its ability to recover smooth spatial structures and quantify uncertainty.
    • Graduate piano recital and annotated program notes

      Savonin, Evelina; Zilberkant, Eduard; McConnell, Sarah; Sun, Yue (2025-05)
      This paper serves as the annotated program notes, examining the repertoire performed in my graduate piano recital on April 14th, 2024. The repertoire features Domenico Scarlatti’s Keyboard Sonatas K. 127, K. 119, K. 466, and K. 427; Johannes Brahms’s Klavierstücke Op. 119; Ludwig van Beethoven’s Sonata in A-Flat Major, Op. 110; and Franz Liszt’s Vallée d’Obermann. The official recital program and YouTube link to my recital are provided in the appendix. Each section of the paper explores the historical context, stylistic characteristics, and interpretive considerations of the compositions, highlighting their distinctive qualities and the composers’ contributions to piano literature. Key elements discussed include form, harmony, thematic connections, structural innovations, and expressive nuances, offering insights into the artistic and technical challenges these works present. This paper thus frames the recital program as a representation of diverse musical traditions and an exploration of contrasting emotional and stylistic landscapes.
    • Implementation of passive battery thermal management of unmanned aircraft systems using tetrahedral lattice porous plates

      Reed, De’Jour; Oyewola, Olanrewaju; Peterson, Rorik; Hatfield, Michael (2025-05)
      This project experimentally investigates the effectiveness of tetrahedral lattice porous plates for passive thermal management of an unmanned aerial vehicle (UAV) batteries. The evaluation utilized a small unmanned aircraft system (sUAS) to conduct demonstrations under both hot and cold climate conditions, assessing the plates’ performance in regulating battery temperatures. Findings indicated that the tetrahedral lattice structure effectively mitigated thermal fluctuations, thereby enhancing battery stability and longevity during operation. The successful demonstration of these plates provides promising evidence for their application in thermal management systems for UAS batteries. This investigation not only highlights the potential of tetrahedral lattice porous plates in maintaining optimal battery performance, but also paves the way for future advancements aimed at extending battery life and flight cycles in UAVs, which is critical for lengthening flight explorations and missions.
    • Fan-side upgrade to fin-fan Intercoolers located at the Central Compressor Plant in Prudhoe Bay, Alaska

      McKenzie, Heather; Peterson, Rorik; Huang, Daisy; Ray, Dustin (2025-05)
      This project proposes an upgrade to the Air-cooled Heat Exchangers (ACHE) known as the Intercoolers at the Central Compressor Plant located in the Prudhoe Bay oilfield on the North Slope of Alaska. The declining field is gas-limited for the majority of the year and the Intercoolers serve as a bottleneck for Field Gas Offtake (FGO). The current configuration incurs high maintenance costs, safety concerns, and operational inefficiencies. The scope of the proposed upgrade involves updating to a Tuf-Lite III fan blade, eliminating the existing gearboxes, and adding Variable Frequency Drive (VFD) control for the motor drive system. The VFDs enable the fan blades to be pitched more aggressively for optimal efficiency during the summer months. These improvements are designed to increase airflow across the bundles and thus increase the cooling capacity of the exchanger. Field testing demonstrated a 15% increase in airflow with the new blade style. The exchangers were modeled using Aspen HYSYS to estimate fouling levels and the Full Field Facility Model (FFFM) was used to correlate the increased cooling capacity of the Intercoolers with FGO. A cost-benefit analysis using HEConomics indicated a payback period of 37 months for the project. The presented study showed that the proposed upgrades are economically viable solutions for all identified problems. Implementation would occur in phases to minimize production impacts by sheltering downtime under larger planned unit outages. The primary metric for success would be the increase in airflow readings following implementation. Future optimization opportunities may include cleaning the fins or replacing the entire tube bundles.
    • Comparison of student success between asynchronous online and in-person sections of calculus 1 using multiple statistical methods

      Masterman, Everett; McIntyre, Julie; Faudree, Jill; Short, Margaret; Goddard, Scott (2025-05)
      This observational study compares outcomes for students taking the in-person and asynchronous online sections of Calculus 1 at the University of Alaska Fairbanks. Propensity score covariate models, propensity score stratification, propensity score matching, and multiple logistic regression were used to predict student pass rates in the course and on the final exam after accounting for demographic variables, student engagement, and student preparation. Propensity score methods showed no difference between asynchronous and in-person students. Multiple logistic regression showed that students in the in-person modality performed better after accounting for covariates.
    • Modal investigation of the Usibelli Building using spectral and dynamic analysis

      Kulikovskiy, David; Ahn, Il Sang; Chen, Cheng-fu; West, Michael (2025-05)
      The purpose of this master’s project is to complete a modal analysis of the Joseph E. Usibelli Engineering Learning and Innovation Building. The modal analysis was conducted in two ways: by completing a spectral analysis using data collected from 7 seismometers and using a computer model of the building’s structural Lateral Force Resisting System. Power spectrum density plots were generated using a Fast Fourier transform routine within MATLAB to identify the natural periods of the building. A building model was created in RISA-3D using construction plan sets to apply a dynamic load and then to find the natural periods of the building. Accurate results from a spectral analysis require multiple earthquakes that have a seismic input at low frequencies. The results in this report found a maximum of two fundamental modes using spectral analysis, which matched well with eigenvalues from the RISA-3D model. The advantage of the spectral analysis is that it is a direct representation of what is going on inside the building. In contrast, the dynamic analysis is used to benchmark the results.
    • Unconsciousness is erasure: a case study of dominant frameworks and their effect on the representation of Alaska native women artists in the University of Alaska Museum of the North Rose Berry Alaska Art Gallery

      Koch, Megan; May, Amy; McDermott, Victoria; Druckenmiller, Patrick; Linn, Angela; Mehner, Da-ka-xeen; Joseph, Brandon (2025-05)
      This case study examines dominant frameworks and their effect on the representation of Alaska Native women artists within the University of Alaska Museum of the North's (UAMN) Rose Berry Alaska Art (RBAA) Gallery. Focusing on the power dynamics inherent in museum exhibitions, this research investigates how dominant practices may silence marginalized voices by utilizing dominant group theory (DGT) and co-cultural theory (CCT). Through qualitative thematic analysis of the RBAA Gallery's descriptive statement and content analysis of 163 artwork records for pieces on exhibit from the Arctos database, this study addresses three research questions: RQ1: What communication approaches and interactional outcomes does the main UAMN RBAA Gallery descriptive statement reflect in the context of Alaska Native women artists’ voices? RQ2: How do the Arctos database records represent the Alaska Native women artists whose work is on display in the UAMN RBAA Gallery? RQ3: How can the communication discipline contribute to museum curatorial practices within the UAMN RBAA Gallery? Findings reveal patterns of underrepresentation and contextualization that perpetuate dominant narratives, hindering the visibility and impact of Alaska Native women’s artistic contributions within the UAMN fine art collection. This research underscores the need for assertive dismantling of dominant frameworks within museum curatorial practices. By contributing a communication-focused research guide, ethical and inclusive engagement with artists is fostered, with direction toward a more holistic understanding of Arctic art and culture.
    • Red sprites & blue jets : initial observations of high altitude atmospheric flashes above thunderstorms from the Sprites Campaign

      Osborne, Daniel L. (1994-07)
      Describes the Sprites Campaign which utilized two aircraft to record the phenomenon, red sprites, above thunderstorm clouds; also describes blue jets that were observed and recorded for study.