Digital Commons Network^™

Independence Of Spectral Contrast Effects Across Different Frequency Regions In Speech Perception, Christian E. Stilp, Matthew B. Winn

Speech Pathology and Audiology Faculty Research and Publications

Identification of speech sounds is influenced by spectral contrast effects (SCEs), the perceptual magnification of spectral differences between successive sounds. SCEs result in the categorization of a target sound being biased away from spectral properties in the preceding acoustic context. Given remarkable consistency in the magnitudes of these contrast effects within the same frequency region, it was hypothesized that they would also show stable relationships across different frequency regions. In this study, normal-hearing listeners’ phoneme categorization and contrast effects were assessed where phonetic contrasts were driven by changes in low-frequency F₁ (“big”-“beg” continuum), mid-frequency F₃ (“dot”-“got”), or high-frequency …

From Glass Ceilings To Balustrades: The Barriers And Supports In Gender-Balanced Corporate Boards Through The Lens Of Activity Theory, Erica Joy Thompson Dias

Dissertations

Purpose: The purpose of this qualitative study was to examine, through the lens of activity theory (AT), barriers individuals on public company boards of directors experienced in achieving or maintaining gender balance and supports that mitigated those barriers.

Methodology: Data were collected through semistructured interviews with 16 directors representing 13 gender-balanced public company boards. Data were coded using the AT framework, which conceptualizes human activity through interacting components including subject, object, rules, tools, community, and division of labor. In this study, barriers were tensions that obstructed progress toward gender balance, and supports were methods, resources, or actions that mitigated those …

Walking On A Tightrope: Women And Managers Navigating Maternity Leave And Return-To-Work, Rachel R. Kalvert

Dissertations

Purpose: This qualitative phenomenological study explored how professional women experience maternity leave and return-to-work, focusing on how managerial communication shapes perceptions of career, competence, belonging, and career progression. The study involved professional women who returned to the same organization full-time from 6 months to 3 years after maternity leave.Methodology: Fourteen professional women were recruited via snowball sampling and listservs. Data were collected through Zoom interviews. Participants completed a demographic questionnaire and received interview questions in advance. The interview guide aligned with the study's three questions. After the interview, participants reviewed AI-generated transcript summaries for accuracy; and participants were given a …

An Explanatory Mixed-Methods Study Identifying And Describing The Perceived Impact Of Five Disruptive Career Skills On Women’S Career Advancement To An Executive Leadership, Roque Ramirez

Dissertations

Purpose: The purpose of this explanatory mixed-methods study was to identify and describe the perceived impact of Johnson and Mohr’s (2019) five disruptive career skills on the career advancement of female chief petty officers with a military background as they progressed into a leadership position.Methodology: This explanatory mixed-methods study examined the experienced of eight female chief petty officers regarding the use of personal disruption strategies. Participants were selected through purposive sampling based on predetermined eligibility criteria and recommendations. Data were collected and analyzed by calculating means scores for quantitative responses and identifying qualitative themes related to the five personal disruption …

Testing The Influence Of Increased Predation On The Evolution Of Morphological Coloration Plasticity In Trinidadian Killifish (Anablepsoides Hartii), Alyssa M. Laux

Biology Theses

The ability to camouflage is a widespread trait in both vertebrates and invertebrates that enhances survival in risky environments. The ability of organisms to respond to shifts in environmental conditions and change color is a conspicuous example of camouflage. Such coloration plasticity can occur rapidly (seconds to minutes) versus longer periods of time (days to months). There are numerous examples of physiological coloration plasticity (short-term) and morphological coloration plasticity (long-term). Yet, there are few tests of the conditions that drive the evolution of physiological vs. morphological coloration plasticity. In this study we use Trinidadian killifish (Anablepsoides hartii) as …

The Mediating Effect Of Socioeconomic Status And Persistent Poverty On Racial And Ethnic Disparities In Pediatric Cancer Mortality In The United States, Josiane Kabayundo, Apu Das, Cheng Zheng, Emma Hymel, Krishtee Napit, Shinobu Watanabe-Galloway

Journal Articles: Epidemiology

BACKGROUND: Socioeconomic (SE) factors have been shown to mediate racial and ethnic disparities in adult cancer mortality. However, evidence in pediatric cancer is limited, especially at finer geographic levels.

OBJECTIVE: Evaluate the mediating effect of socioeconomic status (SES) and persistent poverty in racial and ethnic disparities in childhood cancer mortality using census tract-level data.

METHODS: Data were obtained from the 2006-2020 SEER Incidence Data with Census Tract Attributes Database and included children 0-19 years. Neighborhood-level SES was measured using a composite variable with five categories. Census tracts were classified as persistently poor if 20% or more of the population lived …

The Role Of Academic Vocabulary Instruction In Supporting Secondary English Learners' Science Proficiency, Chue Seng Her

All Electronic Theses and Dissertations

This literature review examines the extent to which academic vocabulary instruction influences secondary English learners’ (ELs’) science proficiency. Science learning requires students to interpret complex texts, engage in academic discourse, and construct evidence-based explanations using discipline-specific language, which may present challenges for ELs. This review provides an overview of research on language demands in science and instructional approaches that support vocabulary development. Findings indicate that academic vocabulary plays a critical role in students’ ability to comprehend scientific content, participate in discourse, and communicate reasoning effectively. Instructional approaches such as explicit vocabulary instruction, scaffolding, discourse-based strategies, reciprocal teaching, cognitive strategy instruction, …

Perceived Adolescent Insecure Attachment With Mothers And Fathers, Helena Pipová, Martin Dolejš, Jaroslava Suchá, Alexander T. Vazsonyi

Sociology Faculty Publications

The aim of this study was to test relationships between adolescent insecure attachment (anxious and avoidant) with mothers and fathers and three outcomes: food addiction, eating disorders, and weight status, in a large multi-regional sample of Czech adolescents. Anonymous, self-reported data were collected from 3,677 adolescents (1,688 boys, 45.9% and 1,989 girls, 54.1%). Both anxious and avoidant attachment with mothers were positively associated with food addiction (p <.001) and eating-disorder risk (p <.001). Importantly, avoidant attachment with fathers uniquely and additively explained variance in both food addiction (p <.001) and eating-disorder risk (p =.003), after controlling for maternal attachment. Weight status was unrelated to attachment and was predicted by sex and parental education only. Study findings highlight the salience of insecure attachment with both mothers and fathers for food addiction and eating disorders among adolescents and identify the parental relationship as a key potential preventative strategy.

Structural And Biochemical Insights Into Phospholipase D Function And Its Small Gtpase Stimulators, Douglas Jay Marr

Electronic Dissertations and Theses, 2010-current

Phospholipase D1 (PLD1) and D2 (PLD2) are lipid metabolizing enzymes that produce phosphatidic acid and contribute to pathologies such as cancer, neurodegeneration, and cardiovascular diseases. Recently, the ARF-like GTPase 11 (ARL11) was identified as an activator of PLD1, but the mechanism of this stimulation remained unknown. Here, we use in vitro biochemical assays and structural predictions to determine that ARL11 interacts with PLD1 using three adjacent, biochemically distinct interfaces, and that the ends of PLD1’s disordered loop form ordered structures to facilitate these interactions. Both PLD1 and PLD2 are peripheral membrane proteins that have differing subcellular localization important for their …

Understanding Resilience In Children In Out-Of-Home Care: Using Person-Centered Health Services Research, Hyeeun K. Shin

Theses and Dissertations--Health Services Research (HSR)

Adverse childhood experiences (ACEs), which refer to exposure to traumatic life events before age 18, and instability in caregiving experiences contribute to poor physical, mental, behavioral, and developmental health outcomes for both children and adults. Previous research shows that these experiences can have negative effects both in the short term and throughout a person’s life. However, children’s strengths, which are the internal and external assets that support their development, can help protect against the impact of ACEs. Effective parenting, positive social support, and self-regulation skills are essential factors that build resilience, helping individuals adapt to challenges that may affect their …

Umbilical Cord Connections: Ban Huay E Kang Women's Ecological Knowledge Transmission And Mobilization, Areerat Worawongwasu, Yuting Zhou, Phyo Su San

Forest and Society

In the Pga K’nyau village of Ban Huay E Kang in the Chiang Mai province of northern Thailand, a newborn's umbilical cord is placed inside a bamboo container and hung from a tree. This is a sacred act of establishing a lifelong connection between each villager and the forest. The practice is known in the Pga K’nyau language as de paw thoo. This tradition has faced significant disruption from state-led conservation policies and the institutionalization of childbirth in state hospitals, which Ban Huay E Kang villagers contest through their revitalization of de paw thoo. Based on collaborative ethnographic research, …

The Unequal Partnership Behind Biodiversity Conservation Efforts In The Eastern Democratic Republic Of Congo, Alexandra Rasoamanana, Eliezer Majambu, Dominique Bikaba, Symphorien Ongolo, Emilie Dupuits

Forest and Society

The growing demand for inclusivity in conservation has led international conservation organisations (ICOs) to collaborate more with local conservation organisations (LCOs). This paper assesses such partnerships through a community-led initiative establishing a wildlife corridor between Maiko and Kahuzi-Biega National Parks. In this region, resource conflicts are often cited as a political justification for recurring conservation failures. However, this framing overlooks crucial questions about how fairness and sustainability in conservation are constructed in practice, particularly within contested forestlands where multiple groups claim legitimacy over ownership. We analyse the structural conditions that enable or constrain the formation of authentic partnerships. Such partnerships …

Electrochemical Sensors Development For Bacterial Detection And Surveillance: Recent Advances And Future Directions, Baljit Singh, Kamna Ravi

Research Outputs: 2025-Present

In today’s environment, rapid, reliable, and accurate bacterial detection is essential for protecting public health while preserving and ensuring the safety of food, water, and agricultural and environmental systems. Over the years, electrochemical sensors have gained widespread attention as viable candidates due to their rapid response, high sensitivity and selectivity, adaptability and portability, and low manufacturing cost. This facilitates their integration into various sectors, including healthcare and diagnostic applications, food safety and agriculture, and water and environmental monitoring. While these achievements represent tremendous progress, some of the challenges that need to be overcome include stability, batch-to-batch reproducibility, manufacturability, performance reliability, …

Soil Respiration Drivers And Challenges In A Changing Environment, Olivia Rae Haas

Theses, Dissertations and Culminating Projects

This study aims to understand post agricultural forested soils (sandy loam, silt loam, and loam) and the influences that drive carbon sequestration and soil respiration flux. Duke Farms in Hillsborough NJ, has historically been utilized as an agricultural zone for farming a variety of crops. Currently the area is protected with a focus on environmental conservation and restoration of the land. This includes getting a better understanding of the forested portions of the property. Understanding the quality of forested areas is vital as they have the potential to act as a carbon sink which can mitigate the effects of climate …

Effect Of Mid-Range Ultraviolet Light On Avian Embryonic Development, Keelie Hughes

Biology Theses

While it is a known fact that specific environmental conditions must be met to ensure proper embryonic development, the impact of changes in this delicate balance is unclear. Ultraviolet (UV) light has a narrow range of effectiveness in mature tissue, where too little can hinder molecular signaling and too much can cause damage to genetic material. This study exposed in ovo chicken embryos in the preliminary stages of development to mid-range UV radiation to examine developing embryo and tissue morphology using anthropometric methods and comparing proliferative cells among embryos exposed to varying doses of UV light. Additionally, quantitative polymerase chain …

Effect Of Two Cut Off Rows On Seepage Underneath Hy-Draulic Structures Using Weak Form Differential Quadra-Ture Element Method: A Theoretical Approach, Esraa Ahmed, El-Masry A. A, Hossam A.A. Abdel Gawad, Ahmed Elhamrawy

Mansoura Engineering Journal

Investigating confined seepage underneath hydraulic structures is crucial to ensure the safety of these structures. The Weak Form Quadrature Element Method (WFQEM) is the basis of this paper, which explores the behavior of confined flow. The seepage flow governing equation is solved numerically to estimate the uplift pressure underneath the hydraulic structures and the exit gradient.The Gauss–Lobatto–Legendre (GLL) type is used as nodal and integration points. Several models were solved to validate the applied numerical method. The obtained results are compared with theoretical and preceding numerical solutions mentioned in the literature. The system of equations generated from applying the WFQEM …

Clean Rides, Healthy Lives: The Impact Of Electric Vehicle Adoption On Air Quality And Infant Health, Cavit Baran, Janet Currie, Bahadır Dursun, Erdal Teki

Cowles Foundation Discussion Papers

This paper provides the first nationwide U.S. evidence on the effects of electric vehicle (EV) adoption on air quality and child health. Using county-level data from 2010–2021, we link EV registrations to air pollution, birth outcomes, and emergency department visits. Endogenous adoption is addressed using two-way fixed effects and an instrumental variables strategy exploiting the rollout of federally designated Alternative Fuel Corridors. Greater EV adoption significantly lowers nitrogen dioxide and improves infant and child health, reducing very low birth weight, prematurity, and asthma-related emergency visits. The largest health gains occur in high-pollution areas and exceed $1.2–$4.0 billion annually.

Estimating Short-Term And Long-Term Survival For Patients With Kidney Failure Using A Mixture Survival Model, Nathan Meyer, Maxwell Donelan, Hossein Moradi Rekabdarkolaee, Brandon Varilek, Surachat Ngorsuraches, Patti Brooks, Jerry Schrier, Semhar Michael

Journal Articles: College of Nursing

Rationale & Objective

Study Design

Setting & Participants …

Design And Fabrication Of A Scaled Automated Dairy Farm Model: A Report, Md Towfiqur Rahman

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Summary

This study investigates how ventilation systems work in dairy barns and builds a scaled model to support education and research. The project is designed to help students from the University of Nebraska–Lincoln (UNL), K-12 learners, and researchers in animal science, veterinary medicine, and engineering gain visual experience with dairy facility components and processes. Different ventilation methods were studied, leading to the design of a 1/64-scale tunnel-ventilated dairy barn meant for 60 Holstein Friesian cows. Barn dimensions were set based on real Holstein cow measurements to ensure proper cow comfort, while airflow requirements were calculated and scaled down. Miniature fans …

Mapping The Genetic Landscape Across 14 Psychiatric Disorders., Andrew D Grotzinger, Josefin Werme, Wouter J Peyrot, Oleksandr Frei, Christiaan De Leeuw, Lucy K Bicks, Qiuyu Guo, Michael P Margolis, Brandon J Coombes, Anthony Batzler, Vanessa Pazdernik, Joanna M Biernacka, Ole A Andreassen, Verneri Anttila, Anders D Børglum, Gerome Breen, Na Cai, Ditte Demontis, Howard J Edenberg, Stephen V Faraone, Barbara Franke, Michael J Gandal, Joel Gelernter, Alexander S Hatoum, John M Hettema, Emma C Johnson, Katherine G Jonas, James A Knowles, Karestan C Koenen, Adam X Maihofer, Travis T Mallard, Manuel Mattheisen, Karen S Mitchell, Benjamin M Neale, Caroline M Nievergelt, John I Nurnberger, Kevin S O'Connell, Roseann E Peterson, Elise B Robinson, Sandra S Sanchez-Roige, Susan L Santangelo, Jeremiah M Scharf, Hreinn Stefansson, Kari Stefansson, Murray B Stein, Nora I Strom, Laura M Thornton, Elliot M Tucker-Drob, Brad Verhulst, Irwin D Waldman, G Bragi Walters, Naomi R Wray, Dongmei Yu, Anxiety Disorders Working Group Of The Psychiatric Genomics Consortium, Attention-Deficit/Hyperactivity Disorder Working Group Of The Psychiatric Genomics Consortium, Autism Spectrum Disorders Working Group Of The Psychiatric Genomics Consortium, Bipolar Disorder Working Group Of The Psychiatric Genomics Consortium, Eating Disorders Working Group Of The Psychiatric Genomics Consortium, Major Depressive Disorder Working Group Of The Psychiatric Genomics Consortium, Nicotine Dependence Genomics (Indigo) Consortium, Obsessive-Compulsive Disorder And Tourette Syndrome Working Group Of The Psychiatric Genomics Consortium, Post-Traumatic Stress Disorder Working Group Of The Psychiatric Genomics Consortium, Schizophrenia Working Group Of The Psychiatric Genomics Consortium, Substance Use Disorders Working Group Of The Psychiatric Genomics Consortium, Phil H Lee, Kenneth S Kendler, Jordan W Smoller

Faculty Research 2026

Psychiatric disorders display high levels of comorbidity and genetic overlap, challenging current diagnostic boundaries. For disorders for which diagnostic separation has been most debated, such as schizophrenia and bipolar disorder, genomic methods have revealed that the majority of genetic signal is shared. While over a hundred pleiotropic loci have been identified by recent cross-disorder analyses, the full scope of shared and disorder-specific genetic influences remains poorly defined. Here we addressed this gap by triangulating across a suite of cutting-edge statistical and functional genomic analyses applied to 14 childhood- and adult-onset psychiatric disorders (1,056,201 cases). Using genetic association data from common …

Density Dependence During Evolutionary Rescue Increases Extinction Risk But Does Not Prevent Adaptation, Laure Olazcuaga, Brett A. Melbourne, Scott W. Nordstrom, Ruth A. Hufbauer

Publications, Reports and Presentations

Evolutionary rescue allows populations to adapt and persist despite severe environmental change. While well studied under density-independent conditions, the role of density dependence, including competition, remains unclear. Theoretical models offer conflicting predictions, with density dependence either increasing extinction risk or enhancing adaptation. We empirically tested how density dependence influences evolutionary rescue by exposing experimental populations to a stressful environment for six generations under density-dependent or independent conditions, with populations where either evolution was possible or was prevented by replacing individuals each generation. Density dependence suppressed population size and increased extinction risk, whereas density independence enabled rapid growth, especially in genetically …

Menstrual Leave In Spain, Lidia De La Iglesia Aza

Dispatches

This dispatch aims to outline a new regulation in Spain regarding menstrual leave as a social security benefit that allows women to take paid leave from work in cases where menstruation-related reasons prevent them from performing their duties. To this end, it looks at menstrual health as a workplace issue in general, before turning to menstrual leave regulation in Spain and its novelties, challenges and remaining controversies.

Ai-Driven Risk Forecasting For Strengthening The United States Food Supply Chain Resilience: Case Study: A National Ai-Enabled Food Supply Chain Risk Forecasting Framework And A Data Analytics Approach To Predicting Disruptions, Sarah Onyeche Usoro, Itua Austin Omogiate, Rahab Zhewe Felix, David Azikutenyi Galadima

Student Publications

The United States food supply chain is one of the most complex and interconnected systems in the world, spanning agricultural production, processing, transportation, storage, and retail distribution. While this complexity enables efficiency and scale, it also increases vulnerability to disruptions caused by climate change, labor shortages, geopolitical shocks, transportation failures, cyber threats, and public health crises. Conventional risk management methods, often reactive and siloed, have proven inadequate in predicting and mitigating systemic shocks that have become frequent occurrences in today’s world. This article examines how artificial intelligence (AI) and data analytics can transform risk forecasting in U.S. food supply chains …

Baatany Goat Project Year Seven And A Half Update:  Helping Keep Roan Mountain’S Natural Balds Bald Naturally

Faculty Open Access Works

11 February 2015 PowerPoint presentation for Mountain View Garden Club, Washington County, TN, updated and revised for written format.

Family Law Agreement And The New Gender Bargains, June Carbone, Brian H. Bix

Articles

The great family law divide is said to be marriage, as marriage has emerged as a marker correlated with race and socioeconomic status. This article argues that the real family law divide, inside and outside of marriage, is agreement. Family law, and the family court system that implements it, produce agreement when legal rules, societal norms, and family court procedures operate together to encourage shared understandings expressed through statuses such as marriage or parenthood, and legally enforceable agreements. In an increasingly unequal society, the family understandings of the college-educated middle class have moved apart from those much less privileged in …

Soil Nutrient Sufficiency Versus Plant Nutrient Status In Compost-Amended Soils: Plant Tissue Analysis As A Diagnostic Tool, Chandralekha Joga Miss

Murray State Theses and Dissertations

This study evaluated whether Mehlich III soil nutrient sufficiency ratings reliably predict plant nutrient status and chlorophyll response across contrasting compost application histories. A greenhouse pot experiment was conducted with Chijimisai (Brassica rapa) planted in three treatment soils that had no compost (T1), moderate compost history (T2), and long-term hog manure compost application (T3). Plant performance was assessed through weekly shoot length and chlorophyll content (SPAD) measurements, leaf number at maturity, and leaf tissue nutrient analysis conducted at harvest. Soil test results indicated adequate to high nutrient levels across all three treatments. Leaf tissue analysis, however, revealed substantial …

An Analysis Of Systemic And Contact Herbicide Usage Trends In Illinois Corn Production Systems, Paige E. Mckittrick

Murray State Theses and Dissertations

Herbicide use is central to weed management in Illinois corn production; however, long-term changes in the balance between systemic and contact herbicides have not been well quantified at the statewide scale. This study analyzes herbicide trends in Illinois corn from 1982 to 2016 using secondary data from the USDA Agricultural Chemical Use Survey, paired with climate, regulatory, and herbicide resistance information. Herbicide active ingredients were classified into systemic and contact functional categories and grouped according to Weed Science Society of America (WSSA) mode-of-action (MOA) codes. For each survey year, total herbicide load (lb a.i./acre), functional proportions, MOA-specific contributions, and a …

Mapping Coastal Vegetation To Evaluate Salt Marsh Decline From 2016 To 2025 In South Carolina, Usa, Zak Henry Bartholomew

Theses, Dissertations and Capstones

Accelerating sea-level rise and storm surge events pose a substantial threat to salt marsh ecosystems, which provide critical ecosystem services. Classification and mapping of coastal vegetation through remote sensing can identify marsh dieback events and provide spatial context for patterns of marsh vulnerability. We used a multi-sensor approach that incorporated LiDAR data, multispectral imagery, and field-derived cover estimates to classify Spartina alterniflora (smooth cordgrass) dominated marsh types on Marine Corps Recruit Depot Parris Island (MCRDPI), a sea island in South Carolina, USA. In summer 2025, surveys were conducted within marsh classes to collect training and validation data. We used random …

Do Magnesium Ions Have Similar Effects As Calcium Ions On Resting Membrane Potential?, Anthony Hana, Youngwoo Kim, Joy Bidros, Katie Neglia, Robin L. Cooper

Biology Faculty Publications

Maintaining a membrane electrical potential of biological cells is a dynamic process, as some cells have a continually changing potential, like pacemaker cells, while other cells may function with large or small changes in the membrane potential. Additionally, some cells may change their electrical potential when stimulated or inhibited by electrical signals, chemical compounds, or both—either simultaneously or episodically. The persistent leak of K⁺ through two-pore-domain potassium channels (K2P) and of Na⁺ through Na⁺ leak channels (NALCNs) and the action of pumps and exchangers are primarily responsible for maintaining a resting potential. Ca²⁺ ions are known …

An Evolving View Of Lineage Diversification, Pascal O. Title, L. Francisco Henao-Díaz, Rosana Zenil-Ferguson, Thais Vasconcelos

Biology Faculty Publications

Systematists have long been fascinated by the astounding variation in species diversity across the various branches of the tree of life, a net result of the uneven rates at which lineages undergo speciation and extinction over time. The past 30 years have seen the development and widespread application of tools that allow diversification to be quantified and characterized in empirical data sets. These advances have, in turn, enabled the statistical evaluation of hypotheses about the causes behind the uneven distribution of species richness among lineages, leading to a more nuanced understanding of diversification rate variation, as reflected in an ever-expanding …