Digital Commons Network^™

Can Generative Ai Make Farming Decisions? Current Status And Future Pathways: A Case Study In Row Crop Production With Chatgpt, Nipuna Chamara, Yufeng Ge, Joe Luck, Yu Pan, Saleh Taghvaeian, Cory Walters, Christopher Proctor, Daran Rudnick, Daren Redfearn

Department of Agricultural and Biological Systems Engineering: Faculty Publications

The agricultural decision-making process is experience-based, knowledge-dependent, time-sensitive, complex, and driven by historical data. Planting, fertilization, irrigation, and chemigation are key categories in farm decision-making, and currently there is no one-shot decision-support tool that covers all these activities. Generative Artificial Intelligence (AI) models are more advanced than traditional machine learning and deep learning models. These models have been trained on vast amounts of data from the internet, allowing them to accept unstructured data in various forms and generate human-like text, solutions to problems, and scenario predictions. Given this capability, we became interested in exploring the potential of generative AI in …

Robert, Powers; Unl Chemistry; Nmr-Assisted Drug Discovery, Mark Griep, Robert Powers

Department of Chemistry: Faculty Interviews

Dr. Robert Powers became a chemistry professor at the University of Nebraska-Lincoln in 2003 and is about to retire after 23 years. Prior to UNL, Bob was a drug discovery researcher for 11 years at American Cyanamid, which eventually became Wyeth and is now part of Pfizer. Bob was born in Jersey City, New Jersey. Something in his youth must have sparked an interest in chemistry because he earned a bachelor's in that subject from Rutgers University in New Brunswick. Then he traveled 1200 miles west to Purdue University in Indiana where he earned his doctorate. Next, he did postdoctoral …

Effect Of Accelerated Adaptation Programs On Feedlot Performance And Health Of Steers Drenched With Megasphaera Elsdenii And Quantifying And Partitioning Multi-Year Carbon Dioxide And Methane Fluxes In A Grazed Temperate Pasture, Rebecca Mcdermott

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

With strong consumer demand for beef and increasing concern about the environmental impacts of beef production, improving production efficiency and advancing the understanding of the environmental footprint are critical for the long-term sustainability of beef production systems. The first experiment evaluated the effect of accelerated adaptation strategies, using energy intake and cattle behavior, on feedlot performance, carcass characteristics, and health of yearling steers drenched with exogenous Megasphaera elsdenii. Accelerated adaptation programs (0, 7, or 14 d transition to 100% finisher) were compared to a traditional 21-d adaptation. Dry matter intake responded quadratically across treatments, with the greatest intake observed in …

Oxide Failures In Sic Power Mosfets, Kate L. Smith

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Ramp to breakdown (RTBD), constant voltage time dependent dielectric breakdown (CVS-TDDB), and low-field long term (LFLT) tests were performed on commercially available silicon carbide MOSFETs from four manufacturers in discrete, TO-247 packaging (A, B, C, and D). Voltage and temperature stress factors are examined for their impact on oxide breakdown. “High temperature gate bias stress test of silicon carbide MOSFETs from multiple manufacturers were performed. It was found that some extrinsic oxide failures are an ongoing problem. The results of the tests and lifetime analysis are presented” (Oxide Failures in SiC Power MOSFETs).

Voice Across Cultures: Performance, Analysis, And Teaching In Western And Chinese Art Song, Binbin Ni

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This doctoral portfolio documents the artistic, scholarly, and pedagogical work completed during my Doctor of Musical Arts studies in Vocal Performance at the University of Nebraska–Lincoln. The portfolio includes materials from two doctoral recitals, one doctoral lecture recital, and supporting teaching and professional documents that together reflect the integration of performance, research, and pedagogy.

The first doctoral recital is accompanied by a research paper examining Maurice Ravel’s song cycle Don Quichotte à Dulcinée. The study explores how Ravel uses musical elements such as rhythm, tonality, accompaniment texture, and melodic gesture to portray different emotional aspects of the character of …

Host Genetic Variation And Environmental Stress Shape Microbiome Assembly And Host–Microbe–Pathogen Dynamics In Drosophila, Nitin Bansal

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Host-associated microbiomes play central roles in host physiology, development, and susceptibility to disease, yet their composition and stability vary widely across genetic, environmental, and ecological contexts. Understanding the factors that shape microbiome structure remains a key challenge in host–microbe biology. This thesis examines how host genetic background and environmental perturbations independently influence gut microbiome composition in Drosophila, and uses mechanistic modeling to explore how microbial dynamics can affect pathogen invasion outcomes.

In Chapter 1, I investigate how mito-nuclear genetic variation influences gut microbiome structure across developmental stages and generations. Using 16S rRNA sequencing, I show that microbiome composition differs between …

Interparental Relationship Quality Reduces Parental Stress And Subsequent Family Dysfunction Across Pregnancy And Early Childhood, Rachel Clara-Beth Beck

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

In this multiple paper dissertation, I found that a higher quality interparental relationship, characterized by more emotional intimacy, support, responsiveness and better conflict management skills, plays a key role in reducing stress and its subsequent impact on family dynamics. Aims and hypotheses were tested using longitudinal data collected from mixed-sex couples during the pregnancy-postpartum transition and into early childhood. In study #1, higher quality interparental support during pregnancy was associated with lower postpartum stress which, in turn, predicted fewer parent–infant bonding impairments. In study #2, a mutually responsive orientation in the couple relationship during pregnancy interacted with intrapersonal regulatory resources …

Practicing A Pedagogy Of Slow Resistance In The Writing Classroom, Kathleen Rose Dillon

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Especially during and following the ‘lockdown era’ of the COVID-19 pandemic, college writing instructors have sought ways to mitigate the harms of neoliberal and capitalist practices in the academy and writing classroom. Incorporating elements of Slow Pedagogy, Disability Studies, Anti-Capitalist Composition, and Participatory Action Research methodology, this dissertation argues for practicing a Pedagogy of Slow Resistance, centering co-creation and relationship-building, to resist neoliberal and capitalist values, and promote student belonging and well-being. This dissertation highlights a classroom study in which two undergraduate students in the TRIO program, which serves students who are first in their family to go to college, …

The Value Of Difficulty In Engineering Education To Professional Work Experience Of Early Career Engineers: A Multiple Case Study, Nosakhare Iyobosa Idiaghe

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Engineering education has long been characterized by rigor, intensity, and selective sorting, conditions often justified as necessary for producing capable engineers. Yet, despite the widespread assumption that academic hardship prepares students for professional practice, relatively little empirical work has examined how graduates themselves interpret the value of these difficult experiences once they enter the workforce. This dissertation addresses that gap by investigating how early-career engineers make sense of the difficulty encountered in their undergraduate education and how those experiences compare to the challenges of engineering practice.

Using a qualitative multiple‑case study design, the research draws on semi‑structured interviews with eight …

Leading While Black: An Examination Of The Black Supervisor Experience Overseeing White Subordinates In Higher Education, Colette Marie Tobias

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This study examines how systemic racism and social capital hierarchies shape the supervisory experiences of Black supervisors. While existing literature has explored leadership and race, it has not fully examined how systemic racism shape Black supervisors’ experiences or how social capital hierarchies play into the behavioral responses of white subordinates. This study addresses that gap by centering the lived experiences of Black supervisors within higher education.

Grounded in narrative inquiry, this research focuses on how participants make meaning of their experiences through their stories. Data was collected through semi-structured interviews and reflective journals with 19 Black supervisors who had at …

An Overview Of Selected Works For Chamber Orchestra: Literature Insights For Conductors Leading Small Orchestra Programs, Ramon Araujo

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This document presents a series of analytical program notes for six orchestral and chamber works spanning four centuries, examined through the intersecting lenses of conductor and educator. The works under consideration, Veracini's Concerto for Violin in D Major, Schubert's Overture to Rosamunde D. 644, Brahms' Serenade No. 2 in A Major Op. 16, Elgar's String Serenade in E Minor Op. 20, Piston's Divertimento for Nine Instruments, and the author's own Tresillos for Orchestra, are treated not merely as historical objects but as active performance problems whose solutions require the integration of scholarly analysis, historically informed practice, and …

A Pedagogy Of Connection: Potentials And Practices For The English Classroom, Alexandra Bissell

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

In a moment characterized by rapid technological advancement and sociopolitical volatility, the academy currently faces the need to redefine what a college education can offer students and reimagine how it delivers on that promise. This dissertation proposes a pedagogy centered on the process of connection as one way that English educators at the collegiate level might approach our teaching and respond to this call. Connection is relational, but also textual and conceptual, and I contend that establishing connection as the catalyst for our pedagogical practices is a powerful way to move forward and support our students’ intellectual growth as well …

Perception Of 3d Data Visualizations, Tyler Wiederich

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Data visualizations are powerful tools for communicating complex data structures. They are typically presented in 2-dimensional formats, such as on paper or computer screens. In recent years, technological advancements have enabled traditional data visualizations to be fully rendered in physical environments through 3D printing, offering more natural interactions. However, this style of graphical rendering remains largely unexplored in empirical evaluations with traditional charts. In this research, we conducted two experiments to assess ratio estimations across 2D and 3D charts in digital and physical environments. The first study partially replicated Cleveland and McGill’s (1984) work in perceptual tasks and expanded to …

Social Bonds And Dynamic Risk In Predicting Juvenile Recidivism Among Florida Probation Youth, Shadrach Sackey

Department of Sociology: Dissertations, Theses, and Student Research

Juvenile recidivism remains a persistent challenge within the United States juvenile justice system, particularly among youth supervised in community-based probation programs. This study examines how family context, school engagement, peer associations, antisocial beliefs, and overall dynamic risk are associated with recidivism among juvenile probation youth in Florida. Drawing on social bond theory and social learning theory, the analysis uses administrative data from the Florida Department of Juvenile Justice (FDJJ) Juvenile Justice Information System, including 6,215 youth who completed community-based probation supervision between 2015 and 2018. Recidivism was measured using two outcomes within a 365-day follow-up period: rearrest and readjudication. Descriptive …

Optimization Of The Baffle Geometry Of A Circular Culvert Outlet Structure To Maximize Energy Dissipation, Kiarash Shirmahi

Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research

High-velocity flow at culvert outlets can lead to significant soil erosion and damage to downstream infrastructure, particularly in agricultural regions where land protection is critical. Circular culverts, commonly used in transportation systems, are especially susceptible to this issue due to flow acceleration caused by geometric constraints and installation angles. Despite extensive research on energy dissipation in rectangular culverts, limited attention has been given to circular configurations. This study addresses this gap by evaluating the hydraulic performance of baffle systems designed to reduce outlet energy in circular culverts.

A series of laboratory experiments was conducted using a scaled physical model of …

Cis-Variant Gene-Expression Association Analysis: A Targeted Approach To Identify Functional Cis-Regulatory Variation, Sofiya Arora

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Phenotypic diversity in plants is largely driven by changes in gene function arising from mutations in both the coding and regulatory regions. Regulatory variation is particularly pervasive because it can fine-tune gene expression without disrupting protein function and is therefore less likely to be strongly selected against in natural populations. As a result, it has played a central role in evolution and domestication. In our previous genome-wide eQTL mapping study in maize, nearly two-thirds of the expressed genes were found to harbor detectable cis-expression quantitative trait loci (cis-eQTLs) with strong local effects on gene expression. Though these cis-variants are widespread, …

Quantitative Genetics, Genomics, And Phenomics In Maize And Sorghum, Nikee Shrestha

Complex Biosystems Program: Dissertations and Student Research

Generating the best crop varieties and hybrids requires identifying genes associated with the phenotype of interest and screening thousands of varieties across multiple locations. Quantitative genetics, along with comparative genomics, phenomics, and machine learning approaches, can help us identify target genes associated with the phenotype of interest to develop the right genotypes. Satellite platforms offer logistical and technical advantages in scalability and accessibility and could facilitate plot-level predictions, especially with steadily improving spatial resolution, thereby empowering the large-scale screening of thousands of genotypes across diverse locations. In the first chapter, I evaluated over 20,000 plot-level images of over 80 hybrid …

The Goad, The Bad, & The Ugly: The Livestreamed Vice Signaling & Body Fascism Of Clavicular & Asmongold, Jacob T. Fry

Department of Communication Studies: Dissertations, Theses, and Student Research

This thesis explores the rhetorical, material, and symbolic implications of fascist livestreaming in the United States through two popular streamers: Clavicular and Asmongold. These two streamers represent a small slice of the rise of different reactionary rhetorics online and how the use of different masculine subcultures—in this case ‘Looksmaxxing’ or Gamer inspired rhetoric—are used as ideological texts for white male supremacy. Whether in front of the glow of their gaming monitor or the flashing lights of a nightclub, the livestreaming of the body, home, relationships, and lifestyles challenge rhetorical conceptions of style, the ‘public/private sphere,’ and political communication. As different …

Clinical Case Study: The Effects Of Task Dynamics And Saltatory Pneumotactile Stimulation On Cerebral Oxygenation, Cognitive Performance, And Sensorimotor Function In An Adult Following Left Ischemic Mca Stroke, Bridget Slagle

College of Education and Human Sciences: Dissertations, Theses, and Student Research

In the chronic stage of stroke recovery, neuroplasticity is thought to require external influence, and is often considered to be experience-dependent, or “Hebbian,” plasticity. Current studies have been investigating multiple ways to induce plasticity to enhance recovery, including investigating the role of sensory stimulation in cortical priming to enhance the effects of rehabilitation interventions.

This case study of an 80-year-old female with aphasia after L-MCA ischemic stroke included 18 neurotherapeutic sessions over 10 weeks. Each session included pneumotactile somatosensory stimulation to the glabrous hand and perioral face, delivered to both the left and right side via the GALILEO, as well …

Bridging Reaction Engineering And Polymers Design: Solvent Effects In Continuous Flow Copolymerization, Leila Ba

Department of Chemical and Biomolecular Engineering: Dissertations, Theses, and Student Research

Poly(glycidyl methacrylate-co-methyl methacrylate) [poly(GMA-co-MMA)] is a promising functional copolymer for photoresist applications due to its reactive epoxy groups and tunable physicochemical properties. This thesis is focused on this polymer and integrates theoretical solubility prediction, thermodynamic modeling, and continuous-flow synthesis to establish quantitative structure–process–property relationships for their use in microelectronic-grade solvents.

Solubility behavior in dimethyl sulfoxide (DMSO), propylene glycol monomethyl ether (PGME), and propylene glycol monomethyl ether acetate (PGMEA) was investigated using the Hildebrand and Hansen models, Hoy group-contribution method, Polymer Genome machine-learning platform, and Flory–Huggins thermodynamic analysis of Gibbs free energy of mixing. Experimental saturation solubility measurements at 25 °C …

The Impact Of Community On Professional Identity In Computer Science Education, Ian A. Kollipara

School of Computing: Dissertations, Theses, and Student Research

This thesis explores the application of Communities of Practice (CoPs) in Computer Science Education. The work consists of two qualitative studies examining related but distinct populations: (1) K–12 CS teachers and (2) undergraduate CS students. The first study presents a retrospective analysis of conneCTION, an online CoP for K–12 CS educators, identifying strengths, weaknesses, and design considerations that inform future platform development. The second study investigates how participation in a CoP can mitigate negative and exclusionary stereotypes in CS. This study was conducted in an under-explored context: a small, private, religious, Midwestern university, and examines an existing community, the Programming …

Eurydice | Tigers Be Still: Technical Direction Between Two Studio Sets, Rory G. Galada Brownell

Johnny Carson School of Theatre and Film: Theses, Student Research, and Creative Work

This thesis examines the technical direction processes for two studio productions, Eurydice by Sarah Ruhl and Tigers Be Still by Kim Rosenstock, produced during the 2025–2026 season at the Nebraska Repertory Theatre. Through comparative analysis, this document explores how differing design styles—metaphorical and installation-based versus grounded realism—impact the planning, communication, and execution responsibilities of a technical director within a constrained academic production environment. Both productions operated within similar parameters, including limited budgets, student-based labor, and a shared performance space, allowing for a focused evaluation of process rather than resources. The Eurydice production emphasized abstract scenic elements, including large-scale string installations …

Improving Genomic Prediction For Feed Efficiency Traits In Beef Cattle Using Microbiome As An Intermediate Omics, Egodage Bhagya Sewwandi Samarakoon

Department of Animal Science: Dissertations, Theses, and Student Research

Feed efficiency traits, including feed conversion ratio (FCR), average daily gain (ADG), and average daily dry matter intake (ADDMI), are economically important in beef cattle production. Emerging evidence suggests that host genetics influences feed efficiency traits through the microbiome. This study evaluates the integration of microbiome data as an intermediate layer in the Neural Network Mixed Model (NNMM), which hierarchically models genotype–microbiome–phenotype relationships as a unified regulatory network to improve genomic prediction accuracy. To reduce the computational burden of NNMM, microbiome features dimension were reduced using principal component analysis (PCA) and direct feature selection of top-ranked open reading frames (ORFs) …

The Detection Of Morbidity Using A Remote Sensing Ear Tag On Newly Received Steers And Feedlot Performance And The Effects Of Feeding Experior And Optaflexx On Carcass Characteristics And Meat Tenderness In Beef Steers, Lauryn O. Smidt

Department of Animal Science: Dissertations, Theses, and Student Research

Two experiments were conducted to evaluate the effects of remote sensing health technology and growth-promoting feed additives on feedlot cattle performance, health outcomes, and carcass characteristics. In the first study, 638 crossbred steers (initial BW = 270 kg; SD = 18.6 kg) were used in a randomized block design to assess the effectiveness of a remote sensing ear tag (RST; HerdDogg, Seward, Nebraska) versus conventional pen-rider observation (PR) for detecting morbidity during a 35-d receiving period and subsequent 180-d finishing period. No differences were detected between PR and TAG for ending BW, average daily gain (ADG), dry matter intake (DMI), …

Rehumanizing Anatomized Individuals: Using Osteobiographies As A Step Towards Reparative Justice, Lillie C. Turpin

Department of Anthropology: Theses and Student Research

In 1985, India banned the export of human remains. This ended the major trade route for primarily US and European anatomical supply companies. Until this point, companies like Carolina Biological Supply exploited and erased vulnerable people's identities, molding them into anonymous anatomical specimens. This study investigates the life and postmortem history of twenty-five individuals, previously used as anatomical specimens, housed at the University of Nebraska–Lincoln. Using an osteobiographical approach, this research reconstructs aspects of these individuals' lived experiences and examines how anatomical preparation practices reflect structural violence and apathy.

Skeletal analysis of twenty-five individuals revealed a range of biological profiles, …

Non-Destructive Automated Classification Of Human And Large Mammal Long Bone Fragments: A Deep Learning Approach Using Micro-Ct Histomorphology And Grad-Cam Interpretation, Kathleen Marie Kelley

Department of Anthropology: Theses and Student Research

This study explores the development and validation of an automated, deep learning system designed to differentiate human from large mammal long bone fragments using micro-CT imagery. A comprehensive dataset of cross-sectional µCT images was assembled from human and animal skeletal material processed at the DPAA, Nebraska. A convolutional neural network (CNN) based on a ResNet-18 architecture, utilizing transfer learning from ImageNet weights, was trained to classify µCT images as human or animal. The model achieved a mean classification accuracy of 89.85% (± 8.27%) across five sample-level cross-validation folds, with a sensitivity of 96.21% and a 95% bootstrap confidence interval of …

Lipid Deposition In Beef Cattle, Kyra L. Elliott

Department of Animal Science: Dissertations, Theses, and Student Research

Both the amount and types of lipid deposition in beef cattle are key determinants of carcass value and meat quality. Amounts of intramuscular, subcutaneous, and visceral fat influence carcass grading outcomes, palatability, and composition traits that are important to beef producers as well as consumers. The objectives of this thesis were to: 1) compare beef grading camera estimates of intramuscular fat to amounts of chemically extractable lipid, 2) characterize the lipidomes of beef intramuscular fat, subcutaneous fat, and lean muscle using shotgun lipidomics, and 3) identify and characterize a novel genetic variant in cattle that may have important implications for …

Characterization Of Activity Changes In Gilts During Estrus Using The NuTrack Livestock Monitoring System, Emily P. Aquino

Department of Animal Science: Dissertations, Theses, and Student Research

Early and accurate detection of estrus in replacement gilts is essential for reproductive success and to ensure efficient production. The objective of this study was to evaluate activity changes occurring relative to first estrus of gilts and subsequent cycles. At ~ 110 days of age, 112 gilts were randomly assigned to 14 pens and placed under continuous video monitoring until the end of the trial at ~ 200 days of age. Daily boar exposure (~ 10 minutes per day) began at ~ 122 days of age. During this period, recorded observations included vulva scores (based on swelling and redness), mounting …

Advancing Targeted Food Allergen Detection: Extraction Optimization And Sample Preparation Method Comparison Using Lc-Ms/Ms, Zhenhao Wang

Department of Food Science and Technology: Dissertations, Theses, and Student Research

Accurate quantification of food allergens in processed foods by liquid chromatography-tandem mass spectrometry (LC-MS/MS) requires effective protein extraction and sample cleanup. However, no single sample preparation workflow has shown consistent performance across diverse food matrices. This study evaluated extraction buffer formulations and post-extraction cleanup strategies for quantification of milk, soy, and peanut allergens in multiple processed food matrices.

Six extraction buffers with varying combinations of SDS, urea, and thiourea alongside a common Tris-HCl/DTT/PVPP base were evaluated across five food matrices. No significant differences in extraction efficiency were observed among buffer formulations for nonfat dry milk (NFDM), non-roasted soy flour, peanut …

The "Evil Forest" As Threshold: A Computational Eco-Feminist Study Of The Forest In Nigerian Fantasy, Cynthia O. Mbagwu

Department of English: Dissertations, Theses, and Student Research

This study examines the representation of the “evil forest” in Nnedi Okorafor’s Zahrah the Windseeker and Ukamaka Olisakwe’s Don’t Answer When They Call Your Name, arguing that the forest functions as a liminal threshold that catalyses female transformation. Combining close reading with computational tools like TF-IDF keyword extraction in Ruby and sentiment analysis using VADER, the project investigates how pre-colonial and colonial connotations of the “evil forest” are re-imagined in contemporary Nigerian fantasy fiction. By segmenting each narrative into pre-liminal, liminal, and post-liminal phases, the study tracks shifts in sentiment toward the forest and correlates them with thematic developments …