Digital Commons Network^™

Roosting Habits Of Male Silver-Haired Bats In The Willard Creek Drainage Of Northeastern California, Alexander Christopher Lewis

Cal Poly Humboldt theses and projects

Silver-haired bats (Lasionycteris noctivagans) are one of the most widely distributed forest bats in North America. Although wildfires have been increasing across their range, how they respond to wildfire is understudied. Previous studies on silver-haired bats and fire focused on roosting behavior in low-severity controlled burns or used acoustics to understand activity levels post-wildfire. Quantifying how silver-haired bats use the physical structures created by high-severity wildfires and the landscape features in which they occur is critical in the face of rapidly shifting fire regimes. During the summer of 2023 and 2024 I radio-tracked male silver-haired bats to 37 roosts …

Ethical Issues In Pandemic Prevention, Preparedness, And Response, Govind Persad

Publications

Pandemic policies raise complex ethical challenges, as well as scientific and technical ones. This chapter examines four critical areas where ethical analysis is essential for effective pandemic prevention, preparedness, and response: spending decisions, clinical research, restrictions on rights and freedoms, and fair allocation of scarce medical resources.

Spending on pandemic prevention, preparedness, and response often involves trade-offs with other societal priorities, such as education, infrastructure, and environment. Navigating these trade-offs requires careful consideration of opportunity costs and distributional impacts.

Rights and freedoms can likewise present difficult trade-offs when pandemic policies restrict individual liberties, requiring clear goals and proportionate responses that …

Wondering And Wandering, Madeleine Herisson-Leplae

Theses and Dissertations

For my thesis, I have taken the concept of excavation and used it as a visual metaphor for my artistic process. Using my recurring motifs of a hole, ladder, and the gem, I break down the writing into three sections. First, the hole, a metaphor for entering an image; second, the ladder, process as investigation; and lastly, the gem, which represents wonder and delight. This work is influenced by childhood fantasies, video games, and believing in magic.

Anchoring Digital Sovereignty, Vivek Krishnamurthy

Publications

For a quarter-century, a consensus has prevailed that territorial sovereignty applies online as it does offline. Since practically all the Internet's infrastructure and its billions of users reside on the territory of states, conventional wisdom holds that sovereignty must extend to cyberspace. Such accounts ignore how people experience cyberspace as a distinctive place, and how current international law lacks safeguards to prevent states from exercising their sovereignty to splinter the Internet into a set of national networks. Territorial sovereignty is also hard to square with pledges by the world's democracies to keep the Internet free, open, and global; yet it …

The Impact Of Led Light Spectra On The Growth, Yield, Physiology, And Sweetness Compound Of Stevia Rebaudiana, Naofel Aljafer, Abdullah Alrajhi, Toby Anderson Von Trampe, William Vevers, Sophie Fauset, Hail Zuhir Rihan

School of Biological and Marine Sciences

This study investigated the effects of several light spectra on Stevia rebaudiana, analysing growth parameters, yield, and physiological responses within a controlled-environment agriculture (CEA) system. The experimental design involved different light treatments, including specific combinations of blue (435 nm and 450 nm), red (663 nm), and ultraviolet (UV) wavelengths (365 nm), to determine their impact on morphological development and biochemical properties, particularly focusing on the production of the sweetening compounds stevioside and rebaudioside A. Stevia rebaudiana plants cultivated from cuttings sourced from a reputable UK nursery (Gardener’s Dream Ltd., Glasgow, UK) were subjected to these spectral treatments over a period …

Moral Foundations For Peacebuilding Dialogue: A Comparative Analysis Of Orthodoxy And Islam, Aleksandr Grizhev, Ivan Blazhevski, Ruzhica Cacanoska

Occasional Papers on Religion in Eastern Europe

Throughout history, religion has been invoked in both peaceful and violent contexts, often manipulated to serve political agendas. However, beneath the surface of conflict, the foundational moral teachings of religions can provide powerful tools for reconciliation. This paper explores the shared moral principles in Orthodox Christianity and Islam, focusing on benevolence, equity, and moderation, to highlight their potential for fostering dialogue and resolving conflicts. By comparing the ethical teachings of the Bible and the Quran, the analysis reveals that both religions emphasize compassion, equity, and self-restraint as core values. Despite the historical use of these faiths to justify division and …

Translating Knowledge Of Functional Cognition Into Occupational Therapy Practice, Mckenzie R. Behrendt, Emilea Rogers, Azia Ourada, Sara Mengler, Mackenzie Post, Stacy Smallfield

Translational Science in Occupation

Functional cognition is a critical component for safely and effectively performing daily occupations. Occupational therapy (OT) practitioners are uniquely positioned and trained to address functional cognition while considering a client’s abilities and environments. A multimedia e-learning module was developed as a teaching modality to enhance understanding and application of functional cognition concepts for OT students and practitioners. As educators, it is important to assess the effectiveness of the teaching and learning experiences we create. We evaluated the multimedia e-learning module for quality, value, and usefulness using critical reflection perspectives. These perspectives included a literature review, as well as from learner, …

3d Printed Microfluidic Platforms For Elisa-Based Diagnostics: Advancing Toward Point Of Care, Brandi Marie Binkley

Graduate Theses, Dissertations, and Problem Reports (ETD)

Protein biomarker detection is a critical analytical method for quantifying proteins in biological samples. It is relevant not only in medical diagnostics and research but also numerous other fields such as environmental monitoring, pharmacology, food safety, and biotechnology. Sensitive detection at picogram-per-milliliter (pg/mL) levels is essential for diagnosing diseases, monitoring progression, and tailoring treatments, especially for low-abundance biomarkers like troponin, interleukin 6, carcinoembryonic antigen (CEA), activin A, and vascular endothelial growth factor (VEGF). Immunoassays, particularly enzyme-linked immunosorbent assays (ELISAs), are the gold standard for protein biomarker detection due to their high specificity and sensitivity. The development of point-of-care (POC) diagnostic …

A Limb-Speed-Driven Locomotor Control System And Its Ability To Adapt, Emily Marie Herrick

Graduate Theses, Dissertations, and Problem Reports (ETD)

Despite how simple walking may seem, the locomotor control system is structurally and functionally complex. Its hierarchical organization of supraspinal and spinal networks with forward and feedback pathways has many interactions at multiple levels that are dependent on the dynamics of a high-dimensional musculoskeletal system. Having a comprehensive understanding of sensorimotor integration within a healthy locomotor control system is crucial for understanding changes to the system due to age or neurologic disease and developing effective technologies to recover mobility in those populations. In this dissertation, we address persistent gaps in knowledge pertaining to how the nervous system controls locomotion.

In …

Co-Transmission Is Co-Opted For The Coordination Of Auditory Sensory Integration, Marryn M. Bennett

Graduate Theses, Dissertations, and Problem Reports (ETD)

Corollary discharge circuits (CDCs) are conserved mechanisms for sensory modulation during species specific behavioral programs. Many behaviors require multiplexed differential sensory modulation for proper execution. Co-transmission of fast and slow neurotransmitters allows for distinct modulation of different downstream targets within one sensorimotor circuit. However, studying co-transmission within the context of modulatory circuits like CDCs requires complete knowledge of behavioral circuits and precise tools for individually determining the implications of each transmitter on its targets. In this dissertation, I used a conserved set of corollary discharge interneurons in Drosophila melanogaster as a model to study the intricacies of sensory modulation through …

Investigating The Biology, Hypovirulence, And Pathogenicity Of Three Canker-Causing Phytopathogenic Fungi In The Cryphonectriaceae And Cytosporaceae On American Chestnut (Castanea Dentata) And Oaks (Quercus Spp.) In The Eastern U.S., Danielle N. Mikolajewski

Graduate Theses, Dissertations, and Problem Reports (ETD)

American chestnut (Castanea dentata) and various oak species (Quercus spp.) are impacted by several economically important canker pathogens in the fungal order Diaporthales, namely Cryphonectria parasitica and Endothia gyrosa (Cryphonectriaceae). Cytospora canker caused by several closely related fungi in the fungal genera Cytospora and Valsa (Cytosporaceae) have also been implicated in causing canker diseases of Quercus and Castanea in Asia, Europe and North America. The impacts of C. parasitica on American chestnut have been exhaustively studied and it’s impacts on various oak hosts have also been broadly investigated and reported. Endothia gyrosa has …

Rare Earth Element Recovery From Acid Mine Drainage Using Ion Exchange And Selective Precipitation Processes, Paubla Andrea Gallego Lopez

Graduate Theses, Dissertations, and Problem Reports (ETD)

Rare earth elements (REEs) are used in high-tech applications due to their electromagnetic and optical properties. As global demand for REEs surges, the limitation of primary mineral deposits has increased interest in alternative sources. One such source is acid mine drainage (AMD), which, although typically low in REE concentration, offers a promising avenue for recovery. Among the emerging recovery methods, ion exchange has shown promise due to its effectiveness at low concentrations and lower operational cost than conventional techniques such as acid leaching and solvent extraction.

This research focused on developing a recovery process by combining ion exchange with selective …

Characterization Of A Descending Neuron That Modulates Flight Performance And Provides Input Onto A Flight-Related Predictive Motor Circuit, Andisheh Balouchi

Graduate Theses, Dissertations, and Problem Reports (ETD)

Descending neurons (DNs) play a critical role in sensorimotor integration by relaying motor information to the ventral nerve cord (VNC). Within the VNC, local interneurons, other DNs, and ascending neurons (ANs) make circuits with sensory and motor neurons to modify flies’ behavior. One important AN pair in Drosophila Melanogaster is mesothoracic ascending histaminergic neurons (MsAHNs), which are known to convey predictive wing motor signals to the brain. DNg32 is the primary upstream synaptic partner of MsAHNs, integrating DNg32 input with other inputs to generate predictive motor signals. The goals of this study were to 1) map the synaptic connectivity of …

Simulated Slot Machine Gambling In Relation To Sign-Tracking, Polina Krom

Graduate Theses, Dissertations, and Problem Reports (ETD)

The propensity to attribute incentive salience to reward-related cues, or sign-tracking (ST) has been linked to addiction in animal models and some initial human data. The current study explores the role of sign-tracking (ST), as a potential risk factor for problematic slot machine gambling, which abundantly features audiovisual reward-related cues, henceforth sensory features. A sample of healthy participants without gambling problems (n = 30) completed a Pavlovian-to-Instrumental Transfer (PIT) paradigm to assess ST propensity and played on a realistic slot machine simulator consisting of two versions: with sensory features (SF+) and without (SF-). Each game version had fixed bet sizes, …

Using Data Science And Sustainability Assessment Tools To Evaluate Wastewater Treatment Technologies, Haidar Shakuir Aldaach

Graduate Theses, Dissertations, and Problem Reports (ETD)

Wastewater management in small communities has faced numerous challenges in recent years, including population growth, limited budgets for operation and maintenance, and stringent effluent standards required by environmental regulations. These challenges motivate enhancing wastewater treatment processes to protect water quality. Wastewater treatment performance can be improved in small towns and rural regions by implementing data-driven strategies. Data science, life cycle assessment (LCA), and life cycle cost analysis (LCCA) are three data-driven decision-making tools that require data collection, modeling, computational models, and statistical analysis that could be utilized to improve wastewater treatment efficiencies. In this study, these three tools were adopted …

Tobacco And Trouble: Exploring The Health Consequences Of Electronic Cigarette Use In Adolescents, Noor Ibrahim Abdulhay

Graduate Theses, Dissertations, and Problem Reports (ETD)

Background: Tobacco use remains one of the leading causes of preventable disease and death in the United States (U.S.). Although conventional cigarette use among youth has declined, the use of electronic cigarettes (e-cigarettes) has become highly prevalent and poses emerging public health concerns. Adolescence represents a critical developmental period for both oral and mental health, making it essential to understand the consequences of tobacco and nicotine exposure during this stage. The goal of this dissertation is to examine the health impacts of tobacco use in adolescents across multiple domains. Specifically, this research (1) synthesizes existing evidence on the relationship between …

The Dna Methylation Capacity Of The Tsetse Fly: Glossina Morsitans, And Its Integration With Symbiont Nutrient Provisioning, Dylan Forrest Richmond

Graduate Theses, Dissertations, and Problem Reports (ETD)

Tsetse flies (Diptera: Glossinidae) are the vector of trypanosomes (Trypanosoma spp.), which are responsible for African trypanosomiasis, also known as sleeping sickness. African trypanosomiasis is a significant health and economic burden yet remains a neglected tropical disease. As an obligate blood feeder, tsetse flies are reliant on B vitamin supplementation from intracellular Gammaproteobacteria, Wigglesworthia glossinidia. Folate (B9) is essential for tsetse development and reproduction, as well as DNA methylation in animals. As a reversible modification, DNA methylation typically occurs in a CpG dinucleotide context and can alter gene expression via the restriction of transcription. Across insects, the …

Power, Economy, And Food Systems In The Confederacy: A Material History Of The Confederate Subsistence Department, John Martin Mcmillan

Graduate Theses, Dissertations, and Problem Reports (ETD)

This dissertation questions how human and non-human actors share power. By exploring Confederate logistics within the Subsistence Department, the collaboration between bureaucrats and the material world is revealed. Contributing to scholarship aimed at expanding the field of Civil War studies, this dissertation not only provides a more complex and interesting view of the conflict, but also an understanding that human beings are not solely responsible for the war’s results. By applying a materialist approach, the causes and outcomes of an event as complicated as a civil war can be better explained and understood. The choice to stockpile food for distribution …

Ciliary Arl14b In Vision, Alexis Breann Crockett

Graduate Theses, Dissertations, and Problem Reports (ETD)

Primary cilia are highly specialized organelles that regulate signaling, trafficking, and sensory perception across multiple tissues, including the retina. The small GTPase ADP Ribosylation Factor-Like Protein 13B (ARL13B) is an atypical ARF-family protein enriched in cilia. ARL13B acts as a guanine exchange factor (GEF) for another small GTPase ARF-like Protein 3 (ARL3). Mutations in ARL13B cause Joubert syndrome, a ciliopathy characterized by brain malformation, developmental delays, and retinal degeneration. Despite ARL13B’s known ciliary localization and clinical relevance, ARL13B’s precise functions in cilia remain poorly defined. This dissertation investigates the cilia-specific roles and GEF-specific roles of ARL13B in photoreceptors using two …

Evaluation Of Small Unmanned Tailsitter Hybrid Air Vehicles Via Full Flight Simulation, Andrew Spencer Winters

Graduate Theses, Dissertations, and Problem Reports (ETD)

Small Unmanned Aerial Vehicles have exploded in popularity in the past 15 years among researchers and for industrial uses such as agriculture, search and rescue, and infrastructure inspection. Fixed wing and multirotor designs present two major paths that can be taken with these technologies. Fixed wing platforms have superior aerodynamic efficiency but require large areas for takeoff/landing and cannot hold a constant position in space, limiting their use. Multirotor configurations offer a more versatile platform that can maneuver in 3 dimensions independently but lack the endurance of fixed wing vehicles. This thesis analyses a quadrotor biplane and a variable wingspan …

Raman Spectroscopy For Rapid Quantification Of Macronutrients In Heirloom Beans, K. Chandler Williams

Graduate Theses, Dissertations, and Problem Reports (ETD)

Quantification of macronutrients in food requires a large investment in facilities and instrumentation as well as ongoing expenses of labor, reagents, and hazardous waste disposal. These costs pose a significant barrier to determining macronutrient quantities in the thousands of uncharacterized landrace and heirloom crops and discourage traditional crop breeding projects from ensuring that their selected crops maintain desirable macronutrient profiles in addition to target agronomic traits. Our objective was to test whether a hand-held Raman spectrometer—a technology which has found use in plant disease diagnostics but remains largely overlooked in nutrient quantification-- could provide a feasible means for quantifying the …

If You Build It: Using Ground Squirrel Risk Perception To Test Wildlife Crossing Structure Success, Sarah Sanz

All Master's Theses

Roads and traffic present many risks for wildlife, and animals must be able to accurately assess risks in their environment. Animals can often perceive the level of risk they face, and their behavioral responses can alter their fitness and potentially even whole-population dynamics. However, animals may be unable to properly measure the levels of risk near roadways because roads present novel environmental conditions and alter predators’ behavior. To mitigate some of the ecological problems created by roadways, wildlife crossing structures (WCSs) are being incorporated into transportation projects. To understand whether WCSs provide quality habitat for wildlife, we compared the levels …

Shrubsteppe Birds Under Fire: Guiding Post-Wildfire Habitat Restoration In The Whiskey Dick And Quilomene Units, Washington, Kevin Clements

All Master's Theses

Bird species, globally, are declining at an alarming rate. Birds of the shrubsteppe are particularly vulnerable to habitat loss caused by agricultural development, invasive vegetation, and heightened wildfire frequency and severity. Fire and invasive vegetation create a positive feedback cycle that threatens complete conversion of shrubsteppe to grasslands. Restoring habitat following wildfire is a top priority for land managers. As bioindicators of ecosystem health, bird populations reflect landscape changes and restoration efficacy. I analyzed bird populations in the Whiskey Dick and Quilomene units of the L.T. Murray Wildlife Area in Kittitas County, Washington following the 2022 Vantage Highway fire. Using …

Scalable Parallel-In-Time Integration For Equations Of Motion, Nathan W. Chapman

All Master's Theses

Physical simulations always need to balance accuracy and run-time. This work implements the Parareal Algorithm using graphics processing units across a distributed system to accurately simulate time-dependent physics while attempting to minimize runtime. Data-transfer latency is identified as the primary bottleneck, for which mitigation methods are provided. Benchmarks comparing single-GPU and distributed implementations on a spectrum of coarse and fine discretizations are analyzed.

Trait-Based Predictors Of Social Rank In Astatotilapia Burtoni, Joshua T. Johnson

All Master's Theses

Dominance hierarchies are a central feature of social species, influencing access to resources, reproductive opportunities, and survival. In many animals, body size is a primary determinant of social rank, but other morphological traits may also contribute. This study investigates how physiological traits—including body size, pigmentation, lachrymal striping, and egg spots—relate to social dominance in Astatotilapia burtoni, a socially dynamic African cichlid.

Side-profile photographs were used to measure body size, red, green, and blue pigmentation intensity, lachrymal stripe area, and egg spot count. Behavioral interactions were recorded and analyzed using the Elo rating system to generate a continuous measure of …

A Colorimetric Sensor Array For Differentiating Emerging Material Contaminants Based On Surface Chemistry, Ifunanya Chiamaka Ede

All Master's Theses

Emerging materials contaminants, such as microplastics (MPs) and engineered nanoparticles (ENPs), are now recognized to contaminate oceans, seas, freshwater, and drinking water through many different exposure pathways. The extent of the materials' water contamination problem has only begun to be properly appreciated in the last decade. While comprehensive global data on the exact quantity of nano- and microcontaminants in drinking water is challenging to ascertain, studies have shown that microplastics and nanoparticles can now be found in drinking water sources worldwide.  Indeed, a well-publicized recent study has shown that 93% of bottled water around the world contains microplastic contamination.

Detecting …

The Figures Of (Sound/Noise) In The Thai Art Context, Haisang Javanalikhikara, Suebsang Sangwachirapiban

Journal of Urban Culture Research

This study explores the evolution of sound art in Thai modern and contemporary art from the 1960s to the present. Early artists visualized sound using traditional elements, while the 1990s saw a shift toward media, video, and performance art, driven by global trends and new art spaces. The 2000s brought international recognition, with artists integrating interactive and conceptual sound elements. By the 2010s, those with music backgrounds introduced sophisticated sound systems and interdisciplinary collaborations. However, challenges persist, including inadequate exhibition spaces, limited funding, and a lack of technical expertise. These constraints slow down innovation and the broader recognition of sound …

A Digital Creative Industry, Webtoons : With A Focus On The Thai Webtoon Market, Sueun Kim, Kyungeun Park, Bongchul Kim, Hyeonwook Joo, Yangwon Hyun

Journal of Urban Culture Research

This study aims to explore the current state and challenges of the webtoon industry as a unique creative industry, focusing on the case of Thailand. First, it examines the characteristics and trends of the Webtoon market in Thailand, and how it contributes to the cultivation of a new creative industry. The study’s findings show that there is a dynamic relationship between the entry of major Korean webtoon platforms and the Thai publishing companies aided by an influx of Chinese capital that entered the market and established themselves as latecomers. In addition, the Thai-drama adaptations of Korean webtoons in Thailand have …

Creative Thai Art Learning For Urban Society’S Well-Being, Apichart Pholprasert, Soamshine Boonyananta, Intira Phrompan, Suchart Imsamraan, Wanalee Chanrangsri, Priyasri Promchinda

Journal of Urban Culture Research

Lifestyles in crowded, fast-paced urban societies have created conditions that negatively affect physical, mental, and social well-being. This research aimed to develop and implement creative Thai art learning activities to promote well-being in urban communities. A mixed-methods approach was employed in four stages: (1) documentary research and community surveys, including interviews with 5 community leaders and 100 residents in the Rama IV area; (2) development of creative Thai art learning kits; (3) implementation of learning activities with a sample of 500 community residents; and (4) data collection involved satisfaction and well-being assessments and follow-up interviews; the resulting data were then …

Towards A Sustainable Play-Ground : Performance Ecosystems For A Livable Bangkok Neighborhood, Pornrat Damrhung

Journal of Urban Culture Research

This article examines an effort to turn urban research into creative placemaking by using performances to make a livable Bangkok neighborhood more vibrant. Research explored diverse stakeholders of Samyan-Banthat Thong in central Bangkok during COVID-19. This exploration found opportunities to link the neighborhood’s entrepreneurs, students, visitors and property managers, and discovered key characteristics of the complex and changing neighborhood. We used this knowledge to design a small festival bringing performing artists into the area’s main park and to important sites surrounding it for a weekend of live performances, workshops and demonstrations. By using performance to attract diverse publics to the …