Digital Commons Network^™

Navigating Mental Health During Covid-19: Considerations Of Childhood Adversity, Pandemic Stress, And Loneliness, Linnea Rose Swanson

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

The purpose of this dissertation study was twofold. First, to determine if the addition of bullying victimization to the Adverse Childhood Experiences (ACEs) Questionnaire (Felitti et al., 1998) would result in a stronger measure of childhood adversity; second to examine the interaction between ACEs, pandemic stress, loneliness, and internalizing symptoms in a sample of young adults living in the United States during the COVID-19 pandemic. ACEs are linked to negative outcomes in adulthood including mental health problems, stress, and loneliness. During the pandemic, increased levels of stress and loneliness were associated with higher rates of internalizing disorders among young adults. …

American Perspectives On The Legitimacy Of Transgender Identities, Sethe Zachman

Department of Sociology: Dissertations, Theses, and Student Research

This mixed-method project examines how Americans’ and Nebraskans’ perceptions of the validity of transgender identities varies by the demographic characteristics of respondents, and how these perceptions are justified. Two representative surveys are used to examine demographic associations with opinion on the cisgender and transgender binary: the 2023 American Values Atlas (AVA) from the Public Religion Research Institute (N=4,788) and the 2022 Nebraska Annual Social Indicators Survey (NASIS) (N=934) from the Bureau of Sociological Research. A measure from the AVA data examines the degree to which respondents believe there are only two genders versus a range of gender identities. The NASIS …

Utilization Of The NuTrack System To Objectively Evaluate Changes In Active And Passive Behaviors Of Group-Housed Nursery Pigs Exposed To An Endotoxin Challenge, Aaron Holliday

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

This study aimed to evaluate the changes in activity of group-housed, newly weaned pigs challenged with lipopolysaccharide (LPS). At weaning, pigs (n = 192, 5.73 ± 1.8 kg) were stratified by sex, litter, and body weight (BW) and randomly assigned to one of three treatments (16 pigs/pen, 4 pens/treatment): 1) Saline-injected (SAL), 2) 50% challenged [50%-LPS) – only half of the pigs in a pen (8 pigs) were challenged with LPS and 3) 100% challenged (100%-LPS) – all pigs in a pen were challenged with LPS. Pigs in the SAL and 32 in the 50%-LPS treatment received a 3.0 …

Using Annual Forages To Replace Declining Cool-Season Grass Pasture Availability, Jonathon Matthew Jenkins

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

As land area in grain crop production increases in the US Midwest, perennial pasture availability decreases but the demand increases. Matching the seasonal growth patterns of C₃ and C₄ plant species to grow forages that are complementary allows producers to fill production gaps in otherwise monoculture systems and possibly increase overall productivity. One way to fill the forage production gap of C₃ grass dominated pastures is by producing a warm-season, annual forage in a separate field. However, with continual reductions in land availability, this may not be an option. Using two studies, our objectives were to improve …

Seasonal Comparison Of Air Quality Variables And Evaluation Of Carbon Dioxide And Particulate Measurement Period In Classrooms, Daud Nosham

Durham School of Architectural Engineering and Construction: Dissertations, Theses, and Student Research

Indoor air quality and thermal environmental variables were measured in 55 classrooms in the mid-western United States spanning a full academic year. The studied air quality and environmental factors included carbon dioxide, temperature, relative humidity, particle counts, air velocity, formaldehyde, total volatile organic compounds, carbon monoxide, nitrogen dioxide, and ozone.

Carbon dioxide and Particulate matter concentrations were measured for a four-day measurement period. Then one-day, two-day, and four-day occupied time average concentrations were calculated which were then compared statistically to figure out an appropriate measurement period for these air quality variables. Kruskal Wallis test and Wilcoxon test were used to …

International Women Graduate Students: Transition To Public Research Universities In The Midwest, Tran Thanh Truc Nguyen

Department of Educational Administration: Dissertations, Theses, and Student Research

This phenomenological qualitative study explored the experiences of international women graduate students (IWGSs) in transitioning to public research universities in the Midwest. The study utilized Schlossberg’s transition theory (Anderson et al., 2012) to gain insights into the perceptions of six participants during their college transition process. Based on the analysis of data collected through in-depth phenomenological interviews with each participant, three themes emerged that described the challenges faced by the participants during their transition. These themes were: solitary voyage, a dilemma of self-reliance and reliance, and a vicious cycle of limited time and financial constraints. Through the three themes, the …

Sun, Thunder, Daugava: Accessible Choral Music From The Latvian Choral Tradition, Paul M. Von Kampen

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

I have been fortunate enough to visit Latvia twice, once in 2009 and again in 2023. With connections made through the global outreach arm of the Lutheran Church Missouri–Synod, I was able to incorporate myself into Latvian culture in ways that may not have been possible had I been a standard tourist. I am grateful to have been invited into the homes of Latvian friends, to have studied in the Jāzeps Vītols Music Academy Library, and to have celebrated both the Jāņi midsummer festival in the Latvian countryside and my twenty-second birthday on the shores of the mighty Daugava River. …

Evaluation Of Essential Oils And Their Major Components For Disease Resistance, Serkan Tokgöz

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

Essential oils (EOs) are natural hydrophobic compounds, which are highly complex, typically comprising 20 to 60 constituents, with two or three main components making up 20% to 95% of their composition, alongside other minor constituents. Research has firmly established the potent antibacterial and antifungal properties of EOs and their primary components. To assess their efficacy, one EO, nutmeg oil, and seven main components, including safrole, toscanol, safraleine, cinnamaldehyde, carvacrol, carvone, and thymol, were tested against four economically significant fungal pathogens (Alternaria solani, Fusarium graminearum, Rhizoctonia solani, and Sclerotiorum sclerotiorum), one oomycete pathogen (Phytium ultimum …

Next-Generation Crop Monitoring Technologies: Case Studies About Edge Image Processing For Crop Monitoring And Soil Water Property Modeling Via Above-Ground Sensors, Nipuna Chamara

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

Artificial Intelligence (AI) has advanced rapidly in the past two decades. Internet of Things (IoT) technology has advanced rapidly during the last decade. Merging these two technologies has immense potential in several industries, including agriculture.

We have identified several research gaps in utilizing IoT technology in agriculture. One problem was the digital divide between rural, unconnected, or limited connected areas and urban areas for utilizing images for decision-making, which has advanced with the growth of AI. Another area for improvement was the farmers' demotivation to use in-situ soil moisture sensors for irrigation decision-making due to inherited installation difficulties. As Nebraska …

Singing While Acting: A Mixed Methods Study Of Classical Singers’ Application Of The Chekhov And Meisner Acting Methods, Amy C. Johnson

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

When considering the minimal acting training incorporated into most voice performance programs, it is understandable why many singers struggle to balance vocal demands with acting demands. Furthermore, the expectations on singers to deliver authentic and nuanced performances are increasing as opera evolves. There is little in-depth understanding of classical singers’ experiences with applying specific acting techniques to their singing. There is also little information about how different acting methods may affect classical singing. This mixed methods collective case study aims to identify the impact of training in a specific acting method on classical singing. The qualitative strand focuses on the …

The Effects Of Partisanship On Legislative Support For Environmental Policies In The United States, Rachel Summers

Department of Environmental Studies: Undergraduate Student Theses

This study investigates the relationship between political partisanship and support for environmental policies at the state level in the United States from the years 2017-2022. To do this, the study focused on two policy areas, water and land, for the average proposed, enacted, and failed bills for all 50 states in the timeframe, with the states categorized as Democratic, swing, or Republican based on the 2016 and 2020 elections. While the study did find that Democratic states were more likely to introduce environmental bills than Republican states, the study also found that there was no statistical difference in the enactment …

Charging Forward: A Comparative Analysis Of Facilitators To Electric Vehicle Adoption In Three U.S. States, Abigail Schroeder

Department of Environmental Studies: Undergraduate Student Theses

Electric vehicles (EVs) are a way to reduce greenhouse gas emissions from transportation, but low consumer adoption rates present a challenge. In order to understand what factors may facilitate EV adoption, a comparative analysis of three U.S. states was performed. These states have the highest rates of EV adoption in the country. Thus, studying them provided insights into what may make EV adoption successful. California, Hawaii, and Washington are the states with the highest EV adoption rates. Based on previous research, a list of 12 characteristics that may influence EV adoption was compiled and applied to each state, focusing on …

Impact Of Pollution On Marginalized Communities: Case Study Of Omaha, Nebraska, Miqaela Davis

Department of Environmental Studies: Undergraduate Student Theses

Environmental justice has been a struggle within our country for years. The goal of Environmental justice is for the fair treatment and equal voice for every single individual regardless of race, income, gender, etc. There has been environmental injustice and racism in many cities, but this study focuses on Omaha, Nebraska. Key questions include: What are some specific pollutants that are prevalent in areas with differing racial majorities in Omaha? What are some of the health patterns in these areas and does it relate to environmental racism? How has Omaha reinforced environmental racism through city planning? Using the Climate and …

Educational Influences On Environmental Perception: A Semester Analysis Of The New Ecological Paradigm Scale In Undergraduates, Zoe Zingler

Department of Environmental Studies: Undergraduate Student Theses

This study evaluated the impact of a geography course, GEOG 181: Global Environmental Issues, at the University of Nebraska-Lincoln on students’ endorsement of the New Ecological Paradigm (NEP) using a pre-course and post-course NEP scale survey. Analyzing paired responses (n = 40) through t-tests and z-scores, only four of 15 statements had statistically significant shifts observed for the entire sample. However, a targeted analysis of students initially possessing lower endorsement of the NEP—early deniers—revealed significant paradigm shifts post-course. While women initially showed stronger NEP endorsement, men demonstrated notable changes following the course towards endorsement of the NEP. Academic majors, whether …

Development Of A Multi-Use Modular Microfluidic Platform Using 3d Printing, Carson Emeigh

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

Microfluidic lab-on-a-chip (LoC) technology has driven numerous innovations due to their ability to perform laboratory-scale experiments on a single chip using microchannels. Although LoC technology has been innovative, it still suffers from limitations related to its fabrication and design flexibility. Typical LoC fabrication, with photolithography, is time consuming, expensive, and inflexible. To overcome the limitations of LoC devices, modular microfluidic platforms have been developed where multiple microfluidic modules, each with a specific function or group of functions, can be combined on a single platform. Modular microfluidics have overcome some of the limitations of LoC devices, but currently, their fabrication is …

Paying To Reduce Disparity: Financially Incentivizing Workforce Diversity And Its Effects On Managers’ Promotion Decisions And Employees’ Effort, Bret S. Sheeley

College of Business: Dissertations, Theses, and Student Research

Disparities in employee representation persist in higher-level organizational positions despite recent attention to workforce diversity and its associated benefits. In response, companies have begun integrating diversity initiatives with varying degrees of specificity (hereafter, “initiative specificity”) into their managers’ compensation packages to increase underrepresented employees’ representation in higher-level organizational positions. This study uses an experiment to examine how offering managers financial incentives to accomplish diversity initiatives (hereafter, “diversity incentives”) and initiative specificity interact to influence managers’ promotion decisions and employees’ effort choices in a promotion setting.

The results suggest that as underrepresented employees’ pre-promotion efforts increase relative to overrepresented employees’ efforts, …

Breakaway Luminaire Pole Research, Jacob Conway

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

This document reports the efforts conducted to determine critical parameters and configurations for Manual for Assessing Safety Hardware 2016 (MASH) Test Level 3 (TL-3) compliant breakaway luminaire poles supported by slip bases, including identifying pole configurations with the potential to meet MASH TL-3 as well as recommending critical configurations for full-scale crash testing. A thorough literature review was conducted which included survey results collected from Midwest Pooled Fund state departments of transportation (DOTs), standard plans from state DOT’s, and past luminaire pole testing.

Numerical LS-DYNA models were developed for luminaire poles with 4-bolt slip base utilized by the Utah Department …

How Gender Affirming Care Affects The Current Sex Estimation Standards In Forensic Anthropology: A Preliminary Study, Dakota Taylor

Department of Anthropology: Theses and Student Research

Current sex estimation standards in forensic anthropology are based on individuals whose gender matches their biological/osteological sex, also known as Cisgendered individuals. Recently, transgender individuals have started to become more common in the forensic context due to the increase in hate crimes and violence. This research builds upon past research done on how facial feminization surgery can affect both visual and metric methods, where it was found that forensic anthropologists should rely on the visual methods if they suspect someone to be transgender due to it being more accurate and being able to clearly state the scars left on the …

The Osteobiography Of Human Remains From The Seaview And Indian Town Trail Archaeological Sites, Maggie M. Klemm

Department of Anthropology: Theses and Student Research

Extensive site surveys and excavations on the Island of Barbuda led by Sophia Perdikaris have identified over 62 sites spanning from the Archaic time period to Historic times. Over the last 18 years, these multidisciplinary teams have focused on mapping all sites and performing rescue excavations on sites threatened by sea level rise, erosion or development. Two such sites are the Saladoid site of Seaview (BA016) and the Troumassoid site of Indian Town Trail (BA01). The dunes surrounding the site of Seaview receive the brunt of storms and hurricanes. In 1998 hurricane Georges exposed skeletal material now part of the …

The Kruger Collection Reimagined: A Case Study In 3d Scanning And Interactive Exhibit Design, Annissa Davis

Department of Anthropology: Theses and Student Research

This thesis examines the use of 3D modeling in museum exhibition to create exploratory exhibits that facilitate unique relationships between the visitors and the collection beyond what is provided by the collection’s in person counterparts. Typical use of 3D modeling in museums is currently often representative rather than exploratory. By employing a Digital Humanities lens to approach the development of a digital exhibition utilizing 3D technology and interactive elements created in a video game engine (Unity), this thesis project evaluates these potential new relationships. Using the Eloise Kruger Collection of Miniatures as a case study, the following text details the …

A Manual On The Planning And Integration Of Archaeological Methods In To Outdoor Forensic Search Investigations, Jonathan Robert Garcia

Department of Anthropology: Theses and Student Research

As archaeology and its applications into forensic contexts develop into the growing discipline of forensic archaeology, an increasing amount of literature has resulted stemming from research on the integration of common archaeological methods. However, much of this literature is intended for professional archaeologists or forensic anthropologists who are well experienced in their respective disciplines. Emerging literature generally does not consider those who leads efforts at forensic scenes in the outdoors such as law enforcement officers who often lack a background in archaeology or forensic anthropology. This thesis seeks to resolve this dilemma by creating a new and accessible manual. The …

Are Researchers Citing Their Data? A Case Study From The U.S. Geological Survey, Grace C. Donovan, Madison L. Langseth

Copyright, Fair Use, Scholarly Communication, etc.

Data citation promotes accessibility and discoverability of data through measures carried out by researchers, publishers, repositories, and the scientific community. This paper examines how a data citation workflow has been implemented by the United States Geological Survey (USGS) by evaluating publication and data linkages. Two different methods were used to identify data citations: examining publication structural metadata and examining the full text of the publication. A growing number of USGS researchers are complying with publisher data sharing policies aimed to capture data citation information in a standardized way within associated publications. However, inconsistencies in how data citation information is documented …

Notes On North American Butterflies, 1, Harry Pavulaan

The Taxonomic Report of the International Lepidoptera Survey

New natural history elements and distribution records of several North American butterflies are reported. Taxonomy is often driven by geographical analyses. Cartography, coupled with internet-based imagery, opens up a promising wealth of information, allowing avocational researchers a tool by which inconvenient visits to institutional collections are no longer necessary for resolving some basic questions. While diversity and distribution of butterflies in North America are commonly believed to be fully known, the findings presented here show that much is yet to be learned of our butterfly fauna.

Ectoparasites Of The Critically Endangered Green Sawfish Pristis Zijsron And Sympatric Elasmobranchs In Western Australia, Jack Ingelbrecht, Karissa O. Lear, Storm B. Martin, Alan J. Lymbery, Bradley M. Norman, Geoffrey A. Boxshall, David L. Morgan

Harold W. Manter Laboratory of Parasitology: Library Materials

This study reports the metazoan ectoparasite fauna of juvenile Critically Endangered green sawfish, Pristis zijsron, and sympatric elasmobranchs in Western Australia. Five parasite taxa were found on 76 screened P. zijsron: Caligus furcisetifer (Copepoda: Caligidae), Dermopristis pterophila (Monogenea: Microbothriidae), Branchellion plicobranchus and Stibarobdella macrothela (Hirudinea: Piscicolidae), and praniza larvae of an unidentified gnathiid isopod. Only C. furcisetifer and D. pterophila were common, exhibiting discrepant site-specificity, with C. furcisetifer occurring mostly on the head and rostrum, and D. pterophila around the pectoral and pelvic fins. Intensity of infection for C. furcisetifer and D. pterophila increased with host total length and …

An Autosomal Recessive Variant In Pygm Causes Myophosphorylase Deficiency In Red Angus Composite Cattle, Mackenzie Batt, Leila G. Venzor, Keri Gardner, Rachel R. Reith, Kelsey A. Roberts, Nicolas J. Herrera, Anna M. Fuller, Gary Sullivan, J. Travis Mulliniks, Matthew L. Spangler, Stephanie J. Valberg, David J. Steffen, Jessica Lynn Petersen

Department of Animal Science: Faculty Publications

Background Between 2020 and 2022, eight calves in a Nebraska herd (composite Simmental, Red Angus, Gelbvieh) displayed exercise intolerance during forced activity. In some cases, the calves collapsed and did not recover. Available sire pedigrees contained a paternal ancestor within 2–4 generations in all affected calves. Pedigrees of the calves’ dams were unavailable, however, the cows were ranch-raised and retained from prior breeding seasons, where bulls used for breeding occasionally had a common ancestor. Therefore, it was hypothesized that a de novo autosomal recessive variant was causative of exercise intolerance in these calves.

Results A genome-wide association analysis utilizing SNP …

Linking Reactive Nitrogen Species Within The Vadose Zone With Surface Irrigation, Kaitlyn Richards

Honors Program: Senior Projects (Public)

This study investigated the relationship between irrigation methods and the mobilization of nitrogen in the vadose zone, focusing on soil properties, water dynamics, and nitrogen species distribution. Data collected from dryland and pivot-irrigated soil cores reveal distinct patterns in water content, bulk density, soil texture, pH, conductivity, and nitrogen concentrations. Results indicated that water content has a major influence in nitrogen availability and microbial activity. Nitrate-N and ammonium-N concentrations varied between dryland and pivot soils, with notable disparities observed. In dryland soils, nitrate-N concentrations varied widely across depth intervals, with notable accumulation in deeper layers, while ammonium-N concentrations exhibited a …

Invent2prevent (I2p) Program Evaluation: Process & Preliminary Outcomes Evaluation Report, Denise Bulling, Stacey Hoffman, Kurt T. Mantonya, Aiden Quinn

University of Nebraska Public Policy Center: Publications

The “Invent2Prevent” (I2P) program is a student led competition to design, implement, and test innovative peer-to-peer initiatives focused on prevention of terrorism, targeted violence or hate. The collegiate competition was the focus of a program evaluation funded by the Department of Homeland Security, Science and Technology Directorate and carried out by the University of Nebraska Public Policy Center, an affiliate of the National Counterterrorism Innovation, Technology, and Education Center (NCITE), a US Department of Homeland Security Center of Excellence housed at the University of Nebraska Omaha. This report provides results of the first phase of the evaluation, documenting preliminary student …

Genetic Diversity Of United States Rambouillet, Katahdin And Dorper Sheep, Gabrielle M. Becker, Jacob W. Thorne, Joan M. Burke, Ronald M. Lewis, David R. Notter, James L. M. Morgan, Christopher S. Schauer, Whit C. Stewart, R. R. Redden, Brenda M. Murdoch

Department of Animal Science: Faculty Publications

Background Managing genetic diversity is critically important for maintaining species fitness. Excessive homozygosity caused by the loss of genetic diversity can have detrimental effects on the reproduction and production performance of a breed. Analysis of genetic diversity can facilitate the identification of signatures of selection which may contribute to the specific characteristics regarding the health, production and physical appearance of a breed or population. In this study, breeds with well-characterized traits such as fine wool production (Rambouillet, N = 745), parasite resistance (Katahdin, N = 581) and environmental hardiness (Dorper, N = 265) were evaluated for inbreeding, effective population size …

Overall And Sex-Specific Associations Of Serum Lipid-Soluble Micronutrients With Metabolic Dysfunction-Associated Steatotic Liver Disease Among Adults In The United States, Weiwen Chai, Meng-Hua Tao

Department of Nutrition and Health Sciences: Faculty Publications

This study examined overall and sex-specific associations of serum lipid-soluble micronutrients including α- and γ-tocopherols, 25-hydroxy-vitamin D (25(OH)D), retinol, and six major carotenoids with metabolic dysfunction-associated steatotic lever disease (MASLD) using the 2017–2018 National Health and Nutrition Examination Survey. This analysis included 3956 adults (1991 men, 1965 women) aged ≥ 20 years. Steatotic liver disease was determined through transient elastography examination. Odds ratios (ORs) and 95% confidence intervals (95% CIs) for MASLD associated with micronutrients were estimated using logistic regressions. Higher serum α-tocopherol (highest vs. lowest quartile: OR = 1.53, 95% CI = 1.05–2.22, p = 0.03) and γ-tocopherol (highest …

Road To A Chemistry-Specific Data Management Plan, Daniela Adele Hausen, Ann-Christin Andres, Jochen Ortmeyer, Sonja Herres-Pawlis

Copyright, Fair Use, Scholarly Communication, etc.

In order to develop a discipline-specific data management plan (DMP) template, it is important to obtain information from researchers. For a chemistry-specific template, NFDI4Chem conducted a series of interviews with 27 participants and used data from the RDA WG Discipline-specific Guidance for DMP online survey.

The interviews showed that the implementation of research data management in everyday work is a big challenge. Key findings from the interview series highlight challenges in implementing FAIR principles, with a focus on “Findability” and “Reusability.” The importance of linking physical samples and data in chemistry is emphasised, with discussions on storage, archiving, and the …