Now showing items 1-20 of 13418

    • The WNBA and activism: a case study of Power of the Dream

      Padilla, Jakki; McDermott, Victoria; May, Amy; Jacob, Nike (2025-08)
      This thesis looks at how WNBA players used their platform to stand up for social and political change during the 2020-2021 season. This research focuses on the documentary Power of the Dream (Porter, 2024), which follows the Atlanta Dream and other WNBA players during a time of a global pandemic, racial injustice, and an election year. Guided by public relations scholars Bernays (1961), Curtain and Gaither (2007), Ciszek (2015) for my methodology. By using the Cultural-Economic Model (CEM) (Ciszek, 2015) and understanding their five interconnected components to guide understanding of activism in sports. By using thematic analysis (Braun & Clarke, 2006), this research found five key themes in the film: power in unity, bigger than basketball, symbolism and strategic communication, intergenerational leadership and emotional labor, and political impact. The WNBA players did more than play basketball, they used their voices and actions to create change. They wore t-shirts with powerful messages, sat out games to protest injustice, and supported political candidates. Their teamwork and leadership helped make a real difference, including helping elect Georgia’s first Black senator. This study shows how athletes can be powerful leaders off the court. It also highlights the emotional strength and care that went into their work on and off the court. The WNBA’s activism reminds us that sports are not isolated from the real world, they are part of it, and athletes have the power to shape it.
    • Modeling the effects of socioeconomic and environmental factors on child malnutrition and contamination risk using generalized estimating equations

      Amoateng, Samuel; McIntyre, Julie; Goddard, Scott; Short, Margaret (2025-05)
      Malnutrition and environmental contamination remain critical public health problems among children under five years old, particularly in developing environments. This paper investigates the sociodemographic, environmental, and behavioral factors that influence the risk of contamination and child malnutrition using Generalized Estimating Equations (GEE) in order to adjust correlations across repeated observations. Two multivariate binary response variables were taken into consideration: SWUbinary comprised of three binary indicators of whether the child was stunted, wasted, or underweight; and RTbinary comprised of two binary indicators of contamination exposure based on the presence of Relative Light Unit (RLU) and Total Coliform Analysis (TCA) contamination in a household. Using Point-Biserial Correlation and Cramer’s V Statistic, relevant predictor variables were screened and backward stepwise selection was used to determine the best set of predictors from those remaining for each of three correlation structures: unstructured, exchangeable and independent. The best model for each of the two response variables was chosen using the Akaike Information Criterion (AIC). For SWUbinary, the exchangeable correlation model was selected, and for RTbinary, the independent correlation model was the selected model. The results show how important it is to look at both nutrition and environmental factors together when trying to improve the health and well-being of children.
    • Dissolved and particulate nutrient dynamics in the Northern Gulf of Alaska: a productive subarctic shelf ecosystem

      Ortega, Emily; Aguilar-Islas, Ana; Danielson, Seth; Hennon, Gwenn; Kelley, Amanda; Strom, Suzanne (2025-08)
      The Northern Gulf of Alaska (NGA) is a biologically productive system, culturally and economically sustaining Alaska’s coastal communities, with inorganic nutrients as an important foundation of this important food web. Nonetheless, seasonal cycles, interannual variability, and nutrient chemistry all influence nutrient dynamics, creating challenges in the overall understanding of the NGA ecosystem and the resources it provides. Therefore, this work examines nutrient sources, sinks, and trends over time and location to identify and explain key nutrient dynamics within the NGA. One key process is the exchange between dissolved (potentially bioavailable) and particulate nutrients that is examined in Chapters Two and Three. In Chapter Two, the seasonal and interannual cycles of dissolved nutrients are examined, and in Chapter Three, the sources, transport, and role of particles as nutrient reservoirs are considered. Finally, in Chapter Four, the Copper River, a major source of both dissolved and particulate nutrients to the nearshore NGA, and its associated freshwater plume are discussed with respect to the transport of resources under variable wind conditions.
    • Exploring the intersection of race and native speakerism in English language teaching: experiences of Black African teachers in Turkey

      Odudele, John Ayodeji; Ryan, Ève; Shoaps, Robin; Marlow, Patrick (2025-08)
      Research on race and native speaker status in language teaching provides little insight into the experiences of Black African English teachers (BAETs) in the diaspora. To address this gap, this study examines how aspects of BAETs' positionalities - such as race and native speaker status create challenges in their professional and societal lives in Turkey. Data from twelve semi­ structured interviews of BAETs were analyzed using thematic analysis. Findings suggest that race­ related challenges trump language-related ones and that Blackness fundamentally shapes outsiders’ perception and value of BAETs’ linguistic expertise. Even when BAETs possess the same or superior qualifications as their White colleagues, they endure additional hardships due to their race (e.g., racial slurs, lower wages). Drawing on Foucault and Bourdieu’s theories of power and capital, along with Flores and Rosa’s concept of raciolinguistic ideologies, this study enhances our understanding of how racial hierarchies of power and capital systematically devalue BAETs' linguistic expertise and professional worth.
    • Measuring Arctic ground squirrel adult neurogenesis in caudal hippocampus using DAB/DAB-Ni enzyme-based immunohistochemistry

      Nguyen, Vy L. P.; Drew, Kelly; Kelleher-Andersson, Judith; Weltzin, Maegan Daniello (2025-08)
      Unconscious patients who are resuscitated after cardiac arrest often have a poor prognosis for neurological recovery and are routinely treated with therapeutic hypothermia as a standard of care. This intervention aims to reduce the risk of death and minimize brain damage. However, results from the Targeted Temperature Management 2 (TTM2) trial in 2021 indicate that cooling does not improve neurological outcomes in these patients. This finding raises questions about the neurological benefits, particularly regarding neurogenesis, of the rewarming phase of therapeutic hypothermia, as well as the effects of repeated cooling and rewarming cycles. Neurogenesis has been largely overlooked in therapeutic hypothermia research, leaving significant gaps in our understanding. Notably, hibernation and therapeutic hypothermia share physiological similarities, but hibernation is a more complex process that confers neurological protection against cardiac arrest in the Arctic ground squirrel (AGS), an extreme hibernator. Specifically, during hibernation, AGS repeatedly lower body temperature to as low as 1 to -3°C, along with reduced blood flow and metabolism during torpor, then periodically rewarm to normal levels during brief interbout arousals. These repeated cooling and rewarming cycles happened at least eight times during hibernation. Building on this knowledge, this thesis explores the possibility that cooling and rewarming could activate neurogenesis and thereby improve the benefits of therapeutic hypothermia by replacing dead and damaged neurons. As proof of concept, I developed a method for measuring hippocampal neurogenesis in the AGS across three seasonal states: summer active, hibernation torpor, and interbout arousal.
    • Effects of vertical earthquake component on columns of reinforced concrete moment frames across different seismic zones

      Neupane, Sujata; Ahn, Il Sang; Farzadnia, Nima; West, Michael; Belz, Nathan (2025-08)
      This thesis investigates the impact of vertical earthquake ground motion on the seismic performance of reinforced concrete (RC) moment-resisting frames. A 12-story RC moment­ resisting frame, designed in accordance with the NEHRP 2015 seismic provisions for Honolulu, Hawaii, was selected. The building was analyzed using nonlinear time history analysis in OpenSees to capture its seismic response under realistic loading conditions. Earthquake records from four seismically active regions—Kathmandu (Nepal), Anchorage (Alaska), El Centro (California), and Honolulu (Hawaii)—were applied to evaluate the influence of vertical ground motion across different seismic zones. Site-specific amplification and scaling factors were implemented to ensure uniformity in ground motion input. This study compares displacement time histories, moment-displacement relationships, axial force-moment interactions, and stress-strain responses of reinforcement and core concrete under three loading scenarios: horizontal-only, combined horizontal with maximum vertical axial load (P-max), and combined horizontal with minimum vertical axial load (P-min). Results indicate that although vertical ground motion contributes minimally to lateral displacement, it significantly alters axial load variations within columns, thereby affecting flexural strength and strain capacity. Increased axial compression in P-max cases enhances moment capacity but limits deformation, while reduced axial compression in P-min cases decreases moment capacity and allows greater These findings emphasize the importance of incorporating vertical seismic components into structural design and assessment, especially for critical elements in regions subject to strong vertical excitation. This study advances the understanding of vertical earthquake effects on RC moment frames and supports enhanced safety in earthquake-prone areas.
    • Kiŋikmiut ukpuliivut: an Iňupiaq framework for bridging spirituality and stewardship in natural resource management

      Angnaboogok, Vernae; Black, Jessica; Anungazuk, Toby Jr.; Carothers, Courtney; Illingworth, Kevin (2025-05)
      Despite decades of traction and respect that Indigenous Knowledge has gained, Western and other sources of academic sciences diverge at the point of what is acceptable, what is real, and what is valid regarding Indigenous spiritual belief systems interwoven throughout Indigenous Knowledge and Indigenous management practices. My project uses Kiŋikmiut1 ukpuliivut2 and iniqtautit3 as a framework to bridge the understanding for people outside our culture about how our spiritual belief system and customary Iňupiaq4 laws ensure balance and sustainability5 ofthe resources that our people depend upon. In this work, I seek to address the misconceptions that dominant Western scientific worldviews have of Indigenous Knowledge and Indigenous spirituality within natural resource management. Through studying Kiŋikmiut oral histories of our elders, my project builds a framework for Kiŋikmiut governance, which maintains social order and balance in our community and our spirit world, especially as it pertains to our hunting, fishing, and gathering way of life. As an Iňupiaq Indigenous researcher whose epistemology comes from the Kiŋikmiut worldview, my research authentically presents the reciprocal relationships between our people and all living and nonliving things from our taġiuq6, nuna7, pitaksrat8, and siḷa9 and all that they provide for us. This project offers an inside view of Kiŋikmiut Ukpuliivut: An Iňupiaq Frameworkfor Bridging Spirituality and Stewardship in Natural Resource Management for the scientific community to learn from and better understand Indigenous ways of knowing in natural resource management and beyond. It presents recommendations for transforming natural resource management frameworks to build equity and respect for Indigenous Knowledge and traditional management practices to ensure adaptive, flexible, holistic management of our traditional food resources10. ----- 1 Kiŋikmiut means the people from Kiŋigin. Kiŋigin means the high place named for the mountain that stands behind our village. The post base -miut means the people of that place or tribe. 2 Ukpuliivut are our spiritual beliefs that are woven into our Indigenous Knowledge system and our traditional management practices. 3 Iniqtautit are our traditional laws that govern our Kiŋikmiut ways of life. 4 Iňupiaq means the real people. Iňupiat are the plural form of the word Iňupiaq. 5 The word sustainability is used in relation to the framework ofthis project, with the understanding that the health, wellbeing, and abundance ofnatural resources is inextricably linked to our Siḷam Inua and the balance that is maintained by adhering to our ukpuliivut and iniqtautit. This concept has also been explored and described by Dr. Oscar Kawagley in the Yup’ik way. (A. O. Kawagley 1995). 6 Taġiuq is ocean. 7 Nuna is land. 8 Pitaksrat means animals. 9 Siḷa is our air/weather spirit that extends into the universe. 10 Our traditional food resources are the fish, wildlife, and other resources, such as marine mammals, fish, birds, duck eggs, shellfish like crab, wild greens, berries, and more, harvested throughout all seasons of the year in accordance with our ukpuliivut and iniqtautit.
    • Effect of climate change on Arctic water quality

      Sarthak, Karki; Aggarwal, Srijan; Dev, Subhabrata; Toniolo, Horacio (2025-08)
      Climate change is fundamentally altering Arctic hydrological systems, impacting water quality and posing challenges for communities dependent on these vulnerable sources. This study examines water quality trends across three distinct Arctic contexts: (1) Arctic glaciers, (2) the Yukon River Basin (YRB), encompassing a five-year dataset (2019-2023) of dissolved organic carbon (DOC), sulfate, and stable water isotopes (δ2H, δ18O, and d-excess) across varying permafrost regions and seasons, and (3) Shishmaref, Alaska, where a washeteria-based drinking water system is affected by environmental and seasonal changes triggered by climate change and coastal erosion. By addressing both regional hydrology and community-specific challenges, the study highlights the critical interplay between glacial melt dynamics, permafrost thaw, and water infrastructure vulnerabilities. This study focused on identifying significant spatial and temporal DOC variations, seasonal sulfate patterns, and stable isotope variability across permafrost regions. Additionally, seasonal differences in Shishmaref’s water quality were hypothesized to result from freeze-thaw processes, impacting heavy metals, sulfate, and nitrate levels. The findings reveal distinct biogeochemical and hydrological patterns: DOC fluxes peaked in late summer and fall, particularly in regions with sporadic and "Thick Thin" permafrost, driven by permafrost thaw and organic matter mobilization. Sulfate concentrations exhibited pronounced seasonal variability, with higher levels during peak thaw (June-August) influenced by sulfate-rich soils, glacial melt inputs, and runoff dynamics. Stable isotope enrichment in δ2H and δ18O and declining d-excess during summer reflected evaporation, altered precipitation sources, and shifting hydrological pathways In Shishmaref, seasonal monitoring revealed elevated heavy metal concentrations, such as zinc and copper, during winter due to infrastructure-related leaching and sediment mobilization under freezing conditions. Increased calcium and sodium concentrations during winter were linked to freeze-thaw-induced mineral dissolution and salt deposition. Conversely, DOC and SUVA values showed minimal seasonal variation, indicating consistent organic matter sources. These findings underscore the urgent need for localized water management strategies and long-term monitoring to mitigate the impacts of climate change on Arctic hydrology and community water security. By drawing parallels between Arctic glaciers and the YRB with specific challenges in Shishmaref water quality, this study offers a comprehensive understanding of Arctic water quality dynamics and their broader implications for adaptation and sustainability.
    • Development of a versatile ground station for satellite communications

      Miller, James; Thorsen, Denise; Hatfield, Michael; Raskovic, Dejan (2023-08)
      The purpose of this project is to create a communication link from a Student Ground Station at the NOAA facility in Fox to the Cubesat Communication Platform (CCP) Cubesat . The Student Ground Station will send Commands (Uplink) and receive Telemetry (Downlink). The radio onboard of the CCP Cubesat is the GOMSpace AX100, which is a Commercial off the shelf system. The GOMSpace AX100 uses Cubesat Space Protocol and AX.25 standards for their packet structure. The GOMspace AX100 uses Frequency Shift Keying (FSK) for modulation. My project will use a Software Defined Radio (SDR) that was coded in Matlab to communicate with the GOMSpace AX100. For Uplink, I will receive bits from COSMOS and conform to Cubesat Space Protocol and AX.25 standards. After I have Cubesat Space Protocol and AX.25 encoded bits, I perform FSK modulation on the bits and send the voltages to the SDR. In Downlink, I will receive samples from the SDR and perform FSK demodulation. After I have bits from demodulation, I will perform AX.25 decoding, then Cubesat Space Protocol decoding. The payload is then extracted from the decoded bits, then the payload data is sent to COSMOS for interpretation. I was able to successfully send commands to the GOMSpace AX100 and I was able to decode Telemetry packets sent by the AX100, which means I was are able to establish a communication link to the AX100.
    • Geotechnical investigation of sand flow slides, Haines, Alaska

      Kalev, Christopher; Darrow, Margaret; Stuefer, Svetlana; Bray, Matthew (2025-08)
      The Lutak Spur (LS) - a prominent glacio-deltaic landform located near Haines, Alaska - formed during the retreat of the Cordilleran Ice Sheet during the Last Glacial Maximum. This study evaluates its geologic evolution, soil development, and hydrologic-slope stability response to a December 2020 atmospheric river (AR) event, which triggered multiple slope failures. Geologic mapping and interpretation of previous work suggest that the LS formed as an ice­ contact kame delta at the margin of a retreating valley glacier. Following deglaciation, post­ glacial isostatic adjustment and sea-level changes exposed the LS surface, allowing for the development of Spodosols with iron-cemented (Fe-cemented) horizons beneath forest vegetation. We used field observations, laboratory testing, and surface drainage mapping to assess slope behavior. Laboratory tests indicated that the Fe-cemented layers contribute cohesion to the strength of near-surface soils with a cohesion of 80 kPa, an average friction angle of 30.9°, and a hydraulic conductivity of 7.6x10-3 cm/s, while the underlying stratified sand exhibited an average friction angle of 36.4°, and an average hydraulic conductivity of 9x10-3 cm/s. Based on measured precipitation and NOAA Atlas 14 precipitation frequency estimates (PFE), the December 2020 AR event approached the intensity of a 1,000-year storm. Hydrologic modeling using HEC-HMS indicated that peak discharges during this extreme precipitation event were approximately three times greater than those produced by a modeled 100-year storm. Seepage modeling in SEEP/W demonstrated that infiltration during the December 2020 AR event elevated groundwater levels and pore-water pressures. Slope stability modeling in SLOPE/W indicated dry slopes were stable, but removal of the organic mat and Fe-cemented layers reduced the factor of safety (FS). Under saturated conditions, the FS dropped below 1.0, consistent with the occurrence of slope failures in 2020. Field evidence, residents’ observations, and modeling results support our hypothesis that tree throw at the slope crest disrupted the Fe-cemented sand stabilizing layer, triggering failures during the AR event. These results suggest that extreme precipitation, in combination with tree throw and surface disturbance, reduced slope stability through transient increases in pore-water pressure and loss of near-surface strength.
    • Benthic community composition and ecosystem function in southern Kachemak Bay, Alaska

      Jossart, Jonah; Mincks, Sarah; Kelley, Amanda; Aguilar-Islas, Ana (2025-08)
      The benthic environment in southern Kachemak Bay, Alaska provides critical ecosystem services, processing organic matter from the land and the sea, and returning nutrients to the food web. In Kachemak Bay, concerns have arisen that marine agriculture (mariculture) operations in the form of salmon hatcheries and oyster farms may have negative impacts on the local environment. This thesis investigates the seafloor sediment environment to assess these potential impacts under salmon hatchery net pens in Tutka Bay Lagoon, and under an oyster farm in Jakolof Bay. We found that beneath the net pens, high waste inputs of fish food, feces and dead fish contribute to negative impacts on the local environment. Very few sediment organisms were found, and most are likely excluded from that habitat by lack of oxygen that arises due to inputs of excess organic matter. Furthermore, the hatchery site showed high oxygen and carbon fluxes associated with microbial and physical processes, because macrofaunal organisms were not present. Time series data show how the lagoon frequently experiences conditions that are outside of the regionally expected values and indicate that waste inputs from hatchery operations, together with the isolated nature of the lagoon, contribute to low oxygen conditions persisting in the deeper portion of the lagoon. Overall, the Tutka Bay Lagoon salmon hatchery has an adverse impact on the local environment. However, oyster farms sites did not show any negative impacts on this specific environment, being similar in terms of their community and ecosystem to non­ mariculture sites, which are good measures of ecosystem status.
    • Spatial and temporal epidemiology of suicides among Alaska Native people

      Hull-Jilly, Deborah; Gifford, Valerie; Ehrlander, Mary; Amstislavski, Philippe; Moore-Nall, Anita (2025-08)
      Alaska has one of the highest suicide rates among Indigenous populations in the United States. This study used data from the Alaska Violent Death Reporting System (AKVDRS) and applied spatial, temporal, and space-time analyses to identify unusual concentrations—or clusters—of suicide among Alaska Native people. This research identified one low-risk rural cluster and ten high-risk spatial clusters: six in urban boroughs and census areas (BCAs) and four in rural BCAs. Space-time analysis revealed eight clusters, most lasting an average of five years, with one emerging during the final three years of the study period. The study identified notable differences in mental health and demographic characteristics among cluster members. Documented mental health issues were more likely among all female decedents. Exposure to the suicide of someone close, a history of suicidal thoughts, prior attempts, and leaving a note occurred more frequently among urban females . Rural female cluster members were more likely to disclose suicidal intent. Among males, urban cluster members had higher rates of diagnosed mental health conditions and prior treatment compared to rural males. Method of suicide also differed: hanging/strangulation/suffocation (H/S/S) was more common among cluster members, particularly urban males. Despite the concentration of behavioral health services in Alaska’s urban areas, suicide clusters occurred in both urban and rural regions, suggesting geographic access alone does not explain these patterns. These findings underscore the value of spatial and space-time methods in identifying risk and protective factors at the community level. The study proposes culturally informed, data-driven prevention strategies. Collaborations with Alaska Native tribal groups may help contextualize this study’s results.
    • Post-fire riverscapes: exploring the ecological and behavioral responses of stream communities to wildfire in boreal streams

      Hinkle, Elizabeth Geraldine; Falke, Jeffrey; Bellmore, J. Ryan; Westley, Peter; Wooller, Matthew (2025-08)
      Wildfire is the dominant disturbance in boreal forest ecosystems, and its frequency and severity are increasing with climate change. This dissertation examines how wildfire affects boreal stream habitats, food webs, and fish movement across spatial and temporal scales in interior Alaska. In Chapter 2, I compared burned and unburned streams 10 to 15 years post-fire using habitat survey, water chemistry, and aquatic community composition data. Burned sites had marginally significant lower canopy cover (-19.6%, p = 0.095), coarser substrate (+23.7 mm, p = 0.102), and higher macroinvertebrate abundance (626 ± 361 vs. 331 ± 349 individuals/m2, p = 0.03); fish biomass was more than twice as high in burned sites. In Chapter 3, I combined stable isotope analysis (δ13C and δ15N values) with simulations from the Aquatic Trophic Productivity (ATP) model to evaluate how wildfire alters food web structure and productivity for up to 50 years post-fire. Field observations revealed that burned streams had greater aquatic macroinvertebrate diversity, longer food chains (δ15N range = 6.2‰ vs. 3.4‰), and lower δ13C values in primary producers, suggesting increased algal energy inputs to food webs. ATP model outputs supported these patterns, predicting persistent increases in macroinvertebrate biomass and fish production for decades following fire. Bayesian isotope mixing models further indicated that juvenile Chinook salmon (Oncorhynchus tshawytscha) and Arctic grayling (Thymallus arcticus) in burned streams relied more on algal-based food resources and exhibited broader niche widths. Chapter 4 applied a spatial stream network model and strontium isoscape to estimate where Arctic grayling reared and moved throughout life. Approximately 20% of modeled fish locations occurred in burned areas, which is roughly proportional to their availability (~23% of the basin), suggesting no strong preference or avoidance at the basin scale throughout the lifetime of individual fish. Larger, mature fish with higher dry mass were disproportionately associated with burned habitats. Life-history clusters characterized by long­ distance movement were more common in burned sites, suggesting that post-fire habitats may provide key foraging opportunities within the boreal riverscape. Overall, my dissertation integrated empirical field data, modeling approaches, and spatial analyses to provide a broad assessment of how wildfire influences the structure and function of boreal freshwater ecosystems.
    • Alaska Earthquake Center Quarterly Review April-June 2025

      McFarlin, Heather; Grassi, Beth; Holland, Austin; Holtkamp, Stephen; Murphy, Nate; Nadin, Elisabeth; Parcheta, Carolyn; West, Michael (Alaska Earthquake Center, 2025-10)
      This series of technical quarterly reports from the Alaska Earthquake Center (AEC) includes detailed summaries and updates on Alaska seismicity, the AEC seismic network and stations, fieldwork, our online presence, public outreach, and lists publications and presentations by AEC staff. Multiple AEC staff members contributed to this report.
    • An investigation of Ichthyophonus infection related in-river mortality in Yukon River Chinook salmon from multiple knowledge systems: Indigenous, local, and western science

      Herron, Keith D.; Westley, Peter; Black, Jessica; Clinton, Morag; Carothers, Courtney (2025-08)
      The recent historic low salmon returns in the Yukon River contribute to an ongoing humanitarian crisis for subsistence users and Indigenous Peoples with cultural and well-being ties to salmon. After over a decade of relative calm, the marine parasite Ichthyophonus has undergone a resurgence and is once again infecting Yukon River Chinook salmon (Oncorhynchus tshawytscha; king; Taryaqvak; Ggaal; Gath; Łuk choo, hereafter referred to as king salmon) at high rates, with currently unknown consequences for survival of migrating adults. This thesis pairs multiple knowledge systems to assess the prevalence, severity, and impact of Ichthyophonus on adult Yukon River king salmon during their upriver spawning migration. Organized as two chapters, I conducted work that suggests highly infected king salmon may experience mortality before reaching spawning grounds due to Ichthyophonus and its interactions with other stressors. Infection severity significantly declined as fish migrated upriver, consistent with selective mortality of severely diseased fish. However, infection prevalence remained largely unchanged during migration, which we attribute to detection limits of testing coupled with infection progression. Through dialogues at community gatherings facilitated in two fishing-dependent Yukon River communities, I sought to co-interpret research findings alongside the Tribal Council and community members. Participants highlighted Ichthyophonus as only one of a myriad of co-occurring challenges faced by Yukon River king salmon and consistently voiced concerns that a focus on disease would be used to assign blame for salmon declines that they felt were more attributable to factors such as marine bycatch, and overfishing. Overall, the approach and findings contribute to an elevation of, and stronger inclusion of, Indigenous Knowledge, Tribal governance, local knowledge, and ecological stewardship within western fisheries science and management. While this thesis provides evidence that Ichthyophonus may indeed contribute to king salmon mortality in-river, it should not be used to diminish the voices of community dialogue participants who emphasized the importance of considering the impacts of industrial fisheries, broader environmental factors, as well as historical and cross- jurisdictional management practices when explaining the low salmon abundance and population declines. I dream this thesis will contribute to mending a proverbial collective fishing net to steward fisheries by uplifting Tribal sovereignty and governance, intentionally weaving together many ways of knowing to guide us toward more equitable, respectful, and restorative salmon management for future generations.
    • Development of low-profile wideband microstrip antennas for CubeSat phased-array applications

      Hay, Mitchell R.; Thorsen, Denise; Hatfield, Michael; Sonwalkar, Vikas (2025-08)
      CubeSat missions rely heavily on effective communication systems in order to transmit and receive large amounts of data quickly and efficiently. The total throughput is limited by the capacity of the channel - a quantity dependent upon the signal quality and bandwidth of the link. Volume and power constraints on a CubeSat impede overall capacity in a fixed bandwidth channel. Phased-array antennas provide a more power efficient solution to improving signal quality by optimizing the spatial properties of the link, rather than broadcasting higher signal power over a broader area through power amplification alone. In order to take advantage of a larger antenna gain without having to mechanically rotate, the array must be controlled properly such that the radiated power is focused in the desired direction. The appropriate steering vector can be determined autonomously through Retrodirective beamforming - a process where the characteristics of arriving signals are used to determine the direction of arrival, and the resulting array directivity is maximized in that direction. In order to accommodate enough bandwidth to transmit and receive at separate frequencies, a low-profile antenna element was developed in this work and arrayed for a 1U CubeSat. The individual circularly-polarized antenna element shows a wide measured impedance bandwidth of 21% (for a 2:1 VSWR) at a low profile of 0.34λ0 × 0.39λ0 × 0.025λ0. The resulting gain of the circularly polarized array averaged a realized gain of ~10-dBic between 2.0 and 2.3-GHz, yielding roughly twice the gain of traditional planar CubeSat antennas at these frequencies, with the added bonus of an array interface for potential beam-steerability.
    • An exploration of factors that influence a clinical supervisor's decision to address the personal development and dispositions of supervisees

      Hagen, Kirsten K.; Gifford, Valerie; Rivkin, Inna; Eldridge, Gloria; Lopez, Ellen (2025-08)
      Research suggests that addressing a supervisee’s personal factors in clinical supervision is critical to developing their therapeutic capacities (Aponte, 1994; Krug and Schneider, 2016; Southern, 2007; Zorga et al., 2001). However, little is known about the factors contributing to clinical supervisors’ decisions to address supervisees’ personal development and dispositions in clinical supervision, despite their importance in supervisees’ professional development. The purpose of this grounded theory study was to discern the nuanced narratives of clinical supervisors and construct a theory of factors related to their decisions regarding whether to address or not address the personal development and dispositions of supervisees in clinical supervision. Using a qualitative approach to the research, the study drew on a purposive sample of clinical supervisors across the United States. A brief demographic questionnaire was followed by in-depth, semi-structured interviews for data collection. Interview transcripts were analyzed using a social constructivist grounded theory methodology. Analysis of the transcripts identified nine themes related to the primary research question: (a) boundaries, (b) conflict avoidance, (c) poor supervisor-supervisee fit, (d) supervisee resistance, (e) time constraint, (f) gatekeeping role, (g) supervisory match process, (h) rapport, and (i) supervision training experiences. Analysis of the participants’ responses to a sub-inquiry identified two additional themes: (a) supervision is not therapy and (b) it’s a gray line. The findings of this exploratory study may benefit clinical supervisors and training programs by offering strategies to assist supervisors in addressing the personal factors of supervisees. The implications of the findings suggest the need for doctoral programs in the helping fields to incorporate improved formal supervision training to reduce barriers to addressing supervisees’ personal development and dispositions. These implications may help to create more comprehensive theories on clinical supervision and improve training experiences for mental-health trainees.
    • Understanding secondary atmospheric chemistry in extremely cold and dark environments through hydroxymethanesulfonate (HMS) measurements in wintertime Fairbanks, Alaska

      Campbell, James R.; Mao, Jingqiu; Green, Thomas; Trainor, Thomas; Simpson, WilliamR. (2025-08)
      Fairbanks, Alaska is a subarctic city that regularly violates PM2.5 air quality standards in the winter, exacerbated by strong wintertime inversion layers and wood stove heating. While primary sources of PM2.5 in Fairbanks have been studied extensively, secondary chemistry remains not well understood. Here, we focus on the aqueous secondary product hydroxymethanesulfonate (HMS), a major sulfur(IV) particulate species, to help understand what drives secondary pollution in Fairbanks. In 2020 and 2021, we used a particle-into-liquid sampler coupled with ion chromatography (PILS-IC) to measure HMS and sulfate concentrations. We report that HMS concentrations are high compared to other highly polluted regions like Beijing, and HMS makes up a significant portion of PM2.5 mass. In 2022, we repeated these measurements as part of the Alaska Layered Pollution And Chemical Analysis (ALPACA) campaign, and examined the processes that allow accelerated formation of HMS in Fairbanks. We find that HMS formation is likely driven by the extremely cold conditions of Fairbanks. HMS formation occurs in aqueous droplets and is highly pH dependent, forming much faster at higher pH. The extreme cold of Fairbanks lowers the volatility of gas-phase ammonia, which leads to increased solubility of aqueous-phase ammonia and increased partitioning to aqueous-phase ammonium, raising particle pH and causing rapid production of PM2.5 HMS. We show how this mechanism applies to other regions globally, and how it can affect pH-dependent sulfate production. To better understand the HMS precursors formaldehyde and SO2 gas, as well as gas-phase pollutants in general, we made volatile organic compound (VOC) measurements in 2022. Many VOC concentrations are much higher in wintertime Fairbanks compared to wintertime measurements in other US cites. We find that diesel vehicles and air mass transport (possibly from nearby areas with more wood heating) are large sources of formaldehyde. Aromatic pollutants like benzene, toluene, and C8 aromatics largely come from gasoline vehicles and heating oil. Methanol, the single largest VOC, was related to windshield wiper fluid. These measurements and calculations lead to a better understanding of secondary pollutant products and VOC concentrations in cold and dark environments like wintertime Fairbanks, AK, and can hopefully contribute to pollution mitigation strategies in the future.
    • Seasonal predictability of sea ice and boreal fire in Alaska

      Borries-Strigle, Cecilia; Bhatt, Uma S.; Bieniek, Peter; McMonigal, Kay; Polyakov, Igor (2025-08)
      Attribution studies have shown that warming Arctic temperatures have led to a substantial loss of sea ice and an increase in large wildfire seasons. With wildfire and sea ice decline impacting everyday life by disrupting transportation or damaging infrastructure, for example, a clear need for skillful forecasts at seasonal timescales has emerged. This dissertation addresses critical challenges in seasonal prediction for wildfire and sea ice in Alaska. The first study evaluates outlooks of Buildup Index derived from three seasonal forecasts to assess their skill in predicting fire conditions. Forecast skill is greatest during the wind (April 1-June 10) and drought (July 21-August 9) fire subseasons and in the Western Boreal subregion of Alaska. Combining the forecasts into a multimodel ensemble substantially improves skill. Next, the same seasonal forecasts undergo a comprehensive evaluation of temperature and precipitation in Alaska. While forecasts exhibit similar biases in average precipitation, biases in average temperature vary among the models. However, wrong forecasts for all models tend to forecast temperature anomalies that are too warm. Case studies of good and bad forecast years suggest that forecast skill is influenced by the strength of teleconnection indices relevant to Alaska climate. The final study quantifies impacts of anomalous ocean heat content (OHC) in the Bering Sea and ocean heat transport through the Bering Strait on September Arctic sea ice concentrations (SIC). The addition of one-time OHC anomalies in the Bering Sea results in enhanced SIC decreases along the shallow continental shelves near Alaska but increases on the order of ~10% in the Central Arctic. Increasing SIC is modeled by suppressed upward heat flux and atmospheric forcing. This research was conducted in collaboration with community partners, and their sustained engagement ensured that the resulting tools and insights were scientifically robust and directly relevant to operational decision making.
    • Monitoring surficial change and forecasting subsurface thermal properties of frozen debris lobes

      Anovick, Claire; Darrow, Margaret; Bray, Matthew; Stephani, Eva (2025-08)
      Frozen debris lobes (FDLs) warrant a multi-faceted research approach due to their complexity as large scale, slow-moving, soil-based landslides located on paraglacial permafrost slopes. Since 2008, University of Alaska Fairbanks-based (UAF) researchers have been monitoring these features due to their increasing rates of downslope movement and proximity to linear infrastructure. The majority of FDLs within Alaska have been observed and/or monitored south of the Continental Divide in the south-central Brooks Range; FDL-A has been studied most extensively because of its proximity to the Dalton Highway and Trans Alaska Pipeline System (TAPS). This thesis synthesizes two research approaches: first, quantification of the detected mass movement of nine FDLs from 2011 to 2023 between discrete digital terrain model (DTM) time steps; and second, thermal modeling of FDL-A with four surface vegetation scenarios from 1970 through 2070. Change detection indicated a net volume loss of FDLs through time, while also highlighting that some FDLs advanced up to 4.1×105 m3 of material near their toes. Sediment disturbance from FDL surface runoff and accumulation also was observed from FDLs -D, -C, -A, and -7. Refined thermal modeling of FDL-A demonstrated that vegetation cover significantly drives permafrost temperature, influencing subsurface stability both now and during a warmer future. Projections indicate that if the surface cover declines, FDL-A could develop taliks and warm above -0.2 °C by 2070. The workflows presented herein provide snapshots of current FDL conditions across their surfaces (via change detection) and at depth (via thermal modeling), serving as useful tools for understanding FDL permafrost dynamics and informing mitigation strategies as FDLs continue to advance downslope.