Digital Commons Network^™

Understanding The Zonal Variability In Cmip6 Projections Of Sahelian Precipitation, Emmanuel Ogwuche Audu

Department of Earth and Atmospheric Sciences: Dissertations, Theses, and Student Research

The uncertainty in model projections of future precipitation across the Sahel has persisted across many generations of Earth System Models (ESMs), with some models predicting drying and others moistening across this region. These discrepancies in future projections pose a challenge for stakeholders and decision makers. Many projections of Sahel precipitation found in the ESMs participating in the sixth phase of Coupled Model Intercomparison Project (CMIP6) show a zonal dipole in precipitation trend, with moistening across the Central and Eastern Sahel and drying projected for the Western Sahel. Previous studies have connected precipitation variability across the Sahel to changes in various …

Spatial Hearing In Simulated Reverberant Classroom Environments, Gabriel Seth Evan Weeldreyer

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

Spatial hearing provides access to auditory spatial cues that promote speech perception in noisy listening situations. However, reverberation degrades auditory spatial cues and limits listeners’ ability to utilize these cues for segregating target speech from competing babble. Hence, spatial unmasking—an intelligibility benefit from a spatial separation between a target and masker—is reduced in reverberant environments as compared to free field. This work tests the hypothesis that interaural decorrelation, the result of increasing reverberation, will broaden the perceived auditory source width with a cascading effect of reduced auditory spatial acuity and subsequently poorer spatial unmasking. To understand the perceptual consequences of …

Impact Of Plant Defenses And Aphid-Associated Microbes In Modulating Sorghum–Sugarcane Aphid Interactions, Edith Ikuze

Department of Entomology: Dissertations, Theses, and Student Research

Sorghum (Sorghum bicolor) is a vital cereal crop globally, facing challenges from invasive pests such as the sugarcane aphid (SCA; Melanaphis sacchari). To elucidate mechanisms of sorghum resistance to SCA, we examined the role of plant defenses and the influence of aphid-associated microbes in modulating sorghum defenses. Lignin is a complex heterogenous polymer present in nearly all plant cell walls that plays a critical role in protecting plants from various stresses. In this study, we investigated the role of the caffeoyl coenzyme-A O-methyltransferase (CCoAOMT), one of the core enzymes in monolignol biosynthesis pathway that leads to lignin …

Breaking The Rule Of Silence: Childbirth And Gendered Power In Efuru And The Joys Of Motherhood, Sunday Elliott Uguru

Department of English: Dissertations, Theses, and Student Research

This study examines the thematic preoccupation of childbirth in the formative period of feminist discourse in African literature through a critical study of selected novels of Igbo women of southeastern Nigeria. The novels studied represent the earliest published African texts in English by women. The period under focus falls within the emerging stage of Nigerian literary tradition in its written form with a dominant presence of men. This study investigates the women novelists' perspective toward the failure of male authored works to represent women's childbirth experience. Through a critical reading of Flora Nwapa's Efuru and Buchi Emecheta's The Joys of …

Vibratory Noise Impacts The Sensory Ecology Of A Funnel-Weaving Spider, Brandi June Pessman

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

Animals experience their world through diverse sensory systems, leveraging information from prey, predators, and potential mates to inform behavioral decisions. Environmental noise disrupts information via spectral or amplitude masking, degradation, or distortion, potentially leading to costly errors in responses. Critically, urbanization has accelerated the proliferation of novel noise sources, triggering significant shifts in communication, foraging, and predator-prey dynamics among urban wildlife. While vertebrate studies have illuminated urban animals’ flexibility to anthropogenic acoustic noise, a comprehensive understanding requires broader investigations across diverse animal taxa and sensory modalities. To address these gaps, my dissertation explored the impacts of anthropogenic substrate-borne (vibratory) noise …

The Good White Guise: Rhetorical (Re)Constructions Of White Allies On U.S. Television, Dakota J. Sandras

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

In this dissertation, I observe how white allyship has been (re)constructed in media by analyzing its representations on mainstream television amidst peak moments of racial reckoning in the United States. In light of heightened demands for antiracist solidarity, I interrogate how such popular texts contribute to gaps between the theory and practice of allyship within the white imaginary. By attending to episodic samples from three distinct genres of American television, I dissect how various interactions and characters coded to signify white allyship rhetorically function to create meaning regarding its contested im/possibilities in both media and in the real world. In …

Genome-Scale Metabolic Modeling Of Chitin-Degrading Microbial Systems, Aimee Kristin Kessell

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

As a major component of fungal cell walls and exoskeletons of invertebrates, chitin is widespread in soils, constituting the second most abundant biopolymer in nature. Composed of N-acetyl-D-glucosamine chains, it serves as a vital source of nutrients, including both carbon and nitrogen, for the growth of microorganisms. A solid understanding of the microbial degradation of chitin is critical for predicting their impacts on biogeochemical cycling in soil ecosystems. Organisms that degrade biopolymers (degraders) produce energetically expensive extracellular enzymes to break down complex organic carbons into simpler labile forms that are sharable with other species, including those that do not contribute …

The Relationship Between Sex Education And Women’S Sexual Liberation And Exploration: A Phenomenological Study, Jessica Ann Boyles

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

Sex education in schools is a pivotal yet contentious aspect of adolescent development, with enduring impacts on individuals' sexual exploration and liberation. However, the types of sex education offered have varied over time, often disseminating misinformation, and reinforcing traditional gender norms. Particularly for women, sex education can perpetuate harmful stereotypes, limit sexual agency, and contribute to disparities in sexual and reproductive health. This qualitative study aims to address the gap of intersecting sex education and sexual identity by examining the relationship between women's sexual liberation and exploration in adulthood and the sex education they received. Drawing from a phenomenological approach, …

The Sexual Trauma Of The Female Body: Violence Against Women In Contemporary Spanish And Latin American Cultures, Lara Armenteros Garrido

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

This dissertation focuses on the idea that women’s bodies have a sexual stigma attached to them as a consequence of different forms of heteropatriarcal violence inflicted on them. From violence in public spaces, such as street harassment or the sexual exploitation of women, to the intimacy of the relationship, like intimate partner violence or the orgasm gap, it becomes increasingly difficult for women to escape violence. Through the analysis of films, documentaries, narratives, and the testimonies of women from Spain and Latin America, I argue there is still a lack of adequate sexual and emotional knowledge to help complete agency …

Sacrificial Lambs: The Perils Of Childhood In Shakespeare, Benjamin Sidney Reed

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

“Sacrificial Lambs: The Perils of Childhood in Shakespeare” utilizes childhood studies to read five Shakespearean plays and how they portray child characters in perilous situations such as kidnapping, banishment, and murder. It argues these dangers emulate real circumstances young people faced in the early modern period, including the boy actors playing these roles. The dissertation’s key research questions include how children in these plays exhibit agency in the face of danger, how they resist adult systems of power, and how audiences in the sixteenth and seventeenth centuries may have responded to these portrayals of imperiled and rebellious youths. The Introduction …

Make America(N Cinema) Great Again: The Rhetoric Of Nostalgia In Trump Era Cinematic Multiplicities, Courtney J. Dreyer

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

This dissertation investigates the rhetoric of nostalgia in politics and popular Hollywood cinema during the Trump era. I argue that MAGA Cinema, the contemporary trend of reboots, remakes, and sequels related to properties from the late 1970s to early 1990s, both respond to and strengthen attachments to an imagined version of the 1980s. However, this illusory golden age more closely reflects the world as depicted in the cinema of the 1980s rather than the reality of American in the years of Ronald Reagan’s presidency. Through a close analysis of David Gordon Green’s Halloween Reboot series, Top Gun: Maverick, and …

Predicting The Future Of Myanmar’S Civil War: Can Half A Century Of Military Rule Be Defeated?, Nathan Ritterling

Honors Program: Senior Projects (Public)

In 2021, the military of Myanmar launched a coup in response to their overwhelming defeat in the 2020 elections, resulting in an end to the country’s tentative move towards democracy and in intense violence to suppress opposition to the coup. Anti-junta forces quickly formed in the aftermath to directly oppose the military and return the country to democratic rule, and began collaborating with long-standing ethnic militias in their efforts. This has led to a state of prolonged civil war, as the two sides fight for dominance over the nature of Myanmar’s future government. This paper investigated the potential outcome of …

Modeling Pedestrian And Bicyclist Crash Exposure With Location-Based Service Data, Yunwoo Nam, Jason Hawkins, Don Butler, Nicholas Aldridge, Mohammad Elayan, Kwant Il (Jason) Yoo

Nebraska Department of Transportation: Research Reports

The rising popularity of non-motorized transportation has brought about safety risks. The inclusion of accurate traffic volume information is one of the key elements to produce robust outcomes when researching safety. The project investigates and enhances transportation safety for pedestrians and bicyclists, emphasizing the integration of Location-Based Services (LBS) data, particularly StreetLight data, to analyze traffic volume and associated risks. The calibration process demonstrates the significance of traffic volume as a key variable influencing prediction accuracy across pedestrian, bicyclist, and vehicle models. The crash analysis reveals a strong correlation between crash counts and traffic activity, with noteworthy findings emerging at …

Native American Choral Music: Strategies For Celebrating And Incorporating Music Of Indigenous People, Mary Ruth Young

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

*Language usage is fluid and evolving, representing past and present people groups. During my discussions with my Indigenous composer colleagues, I've found that they hold varying preferences regarding how they wish to be addressed and the terminology they prefer. Because of this, I use the terms Native, Native American, First Nations, Indigenous, American Indian, and First Peoples interchangeably.*

This document will discuss the historical exclusion of Native American music in the Western art forms, specifically the choral tradition, and provide solutions to incorporate it in modern choral performances. Considering first the wars, disease, displacement, colonization, and missionization, it is no …

Silencing And Surveillance: The Struggle Of Same-Sex Desire In The Shadow Of The 20th-Century Police State, Ethan Dunn

Honors Program: Senior Projects (Public)

This paper investigates the intersection of social perceptions of vice and gender norms in shaping the policing of sexual orientation and sexuality during the turn of the twentieth century. Employing a legal analysis rooted in the law and society movement and critical legal studies, this study examines how social anxieties surrounding vice and vice crimes prompted swift legislative measures at both federal and state levels, resulting in statutes characterized by broad language that granted extensive discretion to law enforcement officials and judges. The emergence of morals and vice police squads further intensified the targeting of individuals who deviated from prevailing …

Design And Fabrication Of A Carbon Fiber Wheel For The Husker Motorsports Club, Benjamin Bashtovoi, Jordan Chapin, Michael Pineda, Caden Lind, Thomas Crum

Honors Program: Senior Projects (Public)

Every year, the Husker Motorsports team participates in a Formula SAE competition that challenges students to design and manufacture a Formula-style vehicle to compete against colleges from around the world. The Husker Motorsports club has sponsored this senior capstone project to improve the vehicle’s performance by reducing unsprung mass. Unsprung mass reduction has numerous benefits on vehicle dynamics, including improved acceleration, handling, and braking. To achieve these performance improvements, the team developed carbon-fiber composite wheels that weigh less than the current wheel solution and provide better rigidity. The team designed and modeled the wheel according to the 2023-2024 competition car …

Decolonizing The Western Perception Of Afghan Women: A Feminist Critique, Parwana Azimi

Honors Program: Senior Projects (Public)

Abstract: Feminist theory and activism have often been reduced to singular movements from Western literature and history. Thus, the exploration of Feminist theory is often limited to Western ideology and values. In doing so, Western Feminism has primarily promoted the rights of Women living in developed countries while leaving women in developing countries or otherwise out of the discussion of women’s rights and status. Most often, women's rights struggles outside of the West are seen as colonial projects which portray Muslim women as helpless and requiring liberation from their cultures. A prominent example of this is the case of Afghan …

Exploring Subtype C Hiv-1 Tissue Reservoirs And The Impact Of Cannabis Use In Virally Suppressed African Individuals, Zhou Liu

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

Antiretroviral therapy (ART) has dramatically prolonged the lives of people living with HIV (PLWH), but it is not curative as it cannot eliminate integrated HIV-1 proviruses in different tissue reservoirs. Even though subtype C HIV-1 accounts for almost half of global HIV-1 infections, few studies had evaluated HIV-1 reservoirs for this subtype. Many co-factors, including the lifestyle factor cannabis use, have been investigated for their potential effects in HIV-1 infection. However, only limited information exists regarding cannabis’s effects on HIV-1 infections in vivo, and the impact of cannabis use on HIV-1 parenchymal tissue reservoirs is unexplored. This dissertation aims to …

Irt-Based Irrigation Scheduling And Dry Bean Crop Water Productivity Under Different Irrigation Scenarios In The Nebraska High Plains, Angie Gradiz

Department of Agricultural and Biological Systems Engineering: Dissertations, Theses, and Student Research

Irrigation plays a critical role for crop production in western Nebraska of the United States, where crop evapotranspiration often exceeds in-season precipitation. This study investigated the impacts of different irrigation treatments on yield and key physiological parameters of dry edible beans grown in semi-arid western Nebraska during the 2022-2023 growing seasons. Seven irrigation levels (0%, 25%, 50%, 75%, 100%, 125%, 150%) of the fully irrigated treatment (FIT), were applied using a Variable Rate Irrigation (VRI) Linear-Move Sprinkler System. Additionally, an eighth treatment was scheduled based on measurement from infrared radiometry thermometers (IRT) to evaluate the performance of the two-source energy …

Asserting Individuality In A Futuristic Dystopia: A Critical Analysis Of "Dirty Computer", Sam Spethman

Honors Program: Senior Projects (Public)

"Dirty Computer" is a groundbreaking science fiction film directed by visionary artist Janelle Monáe, which delves into the complexities of individuality in a dystopian future dominated by oppressive societal forces. Through intricate narrative construction and thematic depth, the film asserts the indomitable nature of human identity against the backdrop of advanced technology and mind control. This paper explores how "Dirty Computer" challenges traditional narratives of conformity and celebrates the power of self-expression and authenticity. By employing critical lenses such as feminist, queer, and racial critiques, along with narrative and visual analysis techniques, the analysis highlights Monáe's embrace of her Black …

Vmed 531: Introduction To Animal Welfare A Faculty-Led Inquiry Into Reflective Scholarly Teaching Benchmark Portfolio, Amy Walton

UNL Faculty Course Portfolios

This benchmark portfolio documents course design, student learning, and reflection of teaching methods for VMED 531 Introduction to Animal Welfare. This one credit hour course provides an overview of animal welfare topics and assessment through a veterinary medical lens. Participants are first year veterinary students that have been accepted into Professional Program of Veterinary Medicine (PPVM). This course creates a foundational knowledge base regarding animal welfare topics and fosters critical thinking with how veterinary treatments, surgeries, and animal-use practices influence animal welfare. The ability to utilize critical thinking skills and science-based evidence to create a sound solution is essential regarding …

Artificial Insemination And Fetal Programming In Beef Production Systems, Dempster M. Christenson

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

Pregnancy to artificial insemination and late gestation fetal programming of the next calf crop are central to genetic development, reproductive longevity, calf crop productivity, and efficiency of cow/calf ranching. The purposes of this research are to find methods to improve pregnancy rate to artificial insemination, the growth and reproductive health of pregnant heifers, and the productivity of their offspring. In the first of four studies we found that extending the period of progesterone administration in an estrus synchronization protocol did not significantly hasten estrus response or increase pregnancy rate to artificial insemination, but timing of estrus within the melengestrol acetate …

A Strategic Audit Of Instacart, Taylor Durbin

Honors Program: Senior Projects (Public)

Instacart is an online grocery delivery and pick-up service that allows users to order groceries and other household items from local and large stores and retailers through its website or mobile app. Apoorva Mehta founded Instacart in 2012 with the intent to help people conveniently access the food they enjoy, and the service now reaches over 14,000 cities across the United States and Canada. This report provides a comprehensive analysis of the company as its rise to becoming a prominent player in the online grocery delivery industry has skyrocketed demand for the service and presented numerous operational challenges for the …

The Stigma Of Deaf: Managing A Stigmatized Identity And Well-Being, Renca Dunn

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

The Deaf identity encompasses cultural, linguistic, and social dimensions that significantly influence the lives of Deaf individuals. The World Health Organization predicts that by 2050, nearly 2.5 billion people worldwide will be living with some degree of hearing loss (2021). While there may be a growing number of people who have some type of hearing loss, there is a distinct group who identify their hearing loss as part of a culture and community. The Deaf community has a rich history, culture, language, and linguistic heritage. The development of the Deaf identity is influenced by factors such as family, education, and …

Iraqi Education Past And Present: The Role Of Policymakers And Their Ideological Background, Hadi T. Pir

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

The history of Iraqi education unmistakably illustrates how policymakers have consistently operated within the same worldview since 1920. Despite apparent differences among Iraqis in terms of race, religion, sect, geography, and social and tribal norms, a shared worldview has emerged, which I term the Traditional Iraqi Paradigm (TIP). This shared worldview comprises a set of interconnected postulates. The divergence among Iraqi groups lies not in the postulates themselves but in how they translate these postulates into actions and behaviors. These translations have become historical, institutional, and psychological aspects of reality contributing to the political, social, and educational differences, conflicts, and …

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 …

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 …

Talking About Writing: Scenes Of Writing Workshops In History And Practice, Erika Luckert

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

This dissertation envisions the writing workshop as a space where we do essential political and social work—where we can reimagine writing, and the teaching of writing, in more interdependent and inclusive ways. This research responds to the work of BIPOC writers and scholars who have urged those of us in Writing Studies to address the homogeneity of the workshop’s history, and to revise its exclusionary logics. Drawing on interviews and observations of teachers in undergraduate creative writing and composition classrooms across the United States, the author examines what actually happens when students talk together about their in-progress writing. This dissertation …

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 …