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Applying User-Centered Design to Build Trust and Enable Cross-Agency Data Sharing to Better Understand the Prevalence and Context of Human Trafficking in Alberta, Canada (open access)

Applying User-Centered Design to Build Trust and Enable Cross-Agency Data Sharing to Better Understand the Prevalence and Context of Human Trafficking in Alberta, Canada

This thesis describes a research study to understand the current state of human trafficking data collection practices and reporting in the province of Alberta, Canada, and gather end-user design considerations for cyberinfrastructure that will enable data sharing between multiple and diverse stakeholders. The research also examines the barriers to change and the needs of stakeholders to improve the collective understanding of human trafficking in the province. Virtual semi-structured interviews were conducted with nineteen organizations including law enforcement and community serving non-profit agencies. While the research resulted in design considerations for a cyberinfrastructure prototype, findings revealed the complexity of the human trafficking ecosystem in Alberta and suggestions for how the community of stakeholders can shift towards a sustained collaborative data sharing culture. This study responds to the need to collect actionable data from multiple sources to reflect the prevalence and context of human trafficking more accurately.
Date: May 2023
Creator: Muyres, Natalie Suzanne
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Bridging the Gap between a Healthy Diet and Agroecology in General Pacheco, Argentina (open access)

Bridging the Gap between a Healthy Diet and Agroecology in General Pacheco, Argentina

This study explores the role Comunidad Milpa (Milpa) plays in implementing agroecology food systems in Comunidad Pacheco, Argentina. From teaching residents about food cultivation practices, to the importance of a healthy diet and developing relationship with local agroecology producers, the method builds upon the idea of food sovereignty and self-governance. Research conducted for this study focused on obstacles residents encountered while seeking to incorporate local agroecology foods into their diet. Incentives encouraging residents to support area agroecology efforts were also investigated, as well as barriers producers experienced while marketing their products. Design methods used for the investigation included both qualitative and quantitative methods in the form of surveys and interviews with members and participants of Milpa. Data gathered through both methods resulted in identifying the perspective Milpa participants have of the organization, their food practices and choices, and obstacles food producers encounter within the community.
Date: May 2023
Creator: Meave, Anya Yvonne
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Classical Gynecology: A History of Unrealistic Expectations Defined by Realistic Sexism (open access)

Classical Gynecology: A History of Unrealistic Expectations Defined by Realistic Sexism

Ancient gynecology is a field with a large number of contradictions. Women were expected to have full awareness of their bodily functions but were not trusted as authoritative experts on the subject. In Rome, the majority of midwives were uneducated slave women, yet the expectations held for a proper midwife required formal education. The ability to give birth made women powerful in the eyes of the Greeks but was also used by Greek men (chiefly Athenians) as an excuse to oppress women. Studying ancient gynecology is a necessity for truly understanding the day-to-day lives of ancient women. In works such as the Odyssey or The Iliad, the women featured are typically upper-class nobles who are in unrealistic settings and have similar abilities, expectations, and lives. By reading through medical texts written by respected physicians such as Soranus and Hippocrates, scholars are provided an in-depth look at how ancient doctors truly saw the female body.
Date: May 2023
Creator: Trammell, Dana
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Closer to Earth

Closer to Earth explores a Black midwestern family's generational spiritual connection to nature through the power of spiritual archiving, ancestral veneration, and oral storytelling.
Date: May 2023
Creator: Bishop, Amber
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Coercion and Consent among Employer-Sponsored and Dependent Visa Holders: A Study of Indian Workers in the U.S. Information Technology Sector

Highly educated and skilled Indian nationals are the largest recipients of H-1B visas in the US. An employer must be willing to sponsor an H-1B work visa for the worker to continue to live and work in the US. This stipulation has granted US employers unprecedented power over H-1B visa holders, which can be understood as status coercion; employers have state-sanctioned power to threaten or discharge a worker from their status, i.e., visa status, which interconnects work and migration status. While the expansive power of employers to curtail a worker's status is one factor driving the ongoing coercive conditions, the other factor is precarious work. There is a gap in the literature in understanding what occurs at the intersection of status coercion and precarious work, especially within high-skilled information technology (IT) jobs. For instance, how does status coercion operate for employer-sponsored H-1B visa holders? Is it similar for dependent visa workers on H-4 EAD visas that rely on their spouse's H-1B, and F-1 OPT visa workers who have employment authorization from USCIS? Lastly, do these visa workers ever resist status coercion? In this study, I draw on twelve in-depth, semi-structured interviews of Indian nationals in the IT sector on H-1B, …
Date: May 2023
Creator: Jangeti, Neha
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Colonial Subject in the Early British Novel: Revisiting Colonial Captivity in "Robinson Crusoe" (open access)

The Colonial Subject in the Early British Novel: Revisiting Colonial Captivity in "Robinson Crusoe"

Scholars today deem Robinson Crusoe the first British novel. Defoe's construction of Crusoe as the atypical British traveler asserts his collective subjectivity within the framework of intimate personal experiences, accentuating his individualism. Yet, as scholars of Orientalism and Transatlantic theory can attest, calling Robinson Crusoe the first novel provides problematic methodologies that arise from affiliating the novel form to a structure associated the British colonialism and fashioning a "superior" British subject. In this essay, I work to emphasize the hybridity present within the novel, utilize historical context to provide a voice to marginalized Indigenous Americans to show how the format relies upon a relationship between collectivism and individualism, assert Indigenous voices matter in the novel, and analyze the relationship of a new collectivism that arises from narratives that cross into American spaces.
Date: May 2023
Creator: Kunasek, Caleb John
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Combined Effects of Polycyclic Aromatic Hydrocarbons and Ultraviolet Light on Benthic and Pelagic Macroinvertebrates

Crude oil commonly enters freshwater aquatic ecosystems as thin sheens forming on the water surface. Oil contains mixtures of toxic compounds called polycyclic aromatic hydrocarbons (PAHs), some of which are known to be photodynamic, increasing toxicity when combined with ultraviolet radiation. Benthic macroinvertebrate communities are commonly utilized as bioindicators, and as such rely on abundant data in literature concerning benthic macroinvertebrates' relative tolerances to a wide range of pollutants. A series of 10 plastic traps, half of which were filtered from UV radiation, were deployed in an urban pond for 27 days to determine colonization preferences of benthic macroinvertebrates to UV exposure. Results of this in situ experiment indicated that the majority of aquatic insects collected from traps inhabited the UV exposed treatment group, particularly the nonbiting midge, Chironomidae. A series of bioassays were then completed to investigate the sensitivities of a Chironomidae species to thin sheens of crude oil in the presence and absence of UV radiation. All bioassays were conducted using 10 day old Chironomus dilutus larvae cultured in the lab. The series of C. dilutus bioassays were all conducted under the same water quality parameters, temperatures, and oil sheen dosing methods, under a 16:8 photoperiod and exposed …
Date: May 2023
Creator: Chapman, Abigail L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Conservation, Connectivity, and Coexistence: Understanding Corridor Efficacy in Fragmented Landscapes (open access)

Conservation, Connectivity, and Coexistence: Understanding Corridor Efficacy in Fragmented Landscapes

Conservation corridors, areas of land connecting patches of natural land cover, are frequently cited and implemented as a restorative strategy to counteract fragmentation. Current corridor ecology focuses on experimental corridor systems or designed and built conservation corridors to assess functionality. Such systems and designs are typically short, straight swaths of homogenous land cover with unambiguous transitions between patches. Quantifying the degree to which amorphous landscape configurations, tortuosity, and heterogeneity of land cover and land uses within the corridor has on functional connectedness is a crucial yet overlooked component of corridor efficacy studies. Corridor literature lacks a robust and repeatable methodology for delineating existing landscape elements, recognizing arbitrary edges, and identifying the start and end of ambiguous transitions between the patches and corridor. Using a set of landscapes being studied as part of a global assessment of corridor efficacy, I designed a workflow that standardizes the boundary of corridor-patch interfaces. The proposed method is a quantitative and repeatable approach that minimizes the subjectivity in corridor delineations. This research investigates the degree to which the existence of a corridor modifies the structural and functional connectivity between patches connected by a corridor compared to an intact reference area.
Date: May 2023
Creator: Long, Amanda M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
"Death Date" (open access)

"Death Date"

This project consists of a union between sci-fi, magic, and realism. Using magic in the same contexts of realism is to make a legend come to life in our modern world. All three stories deal with difficult situations: the struggle of creation and insecurities, the struggle of suicide and overcoming traumatic experiences, the struggle of disabilities and disadvantages and turning it into strength. These topics are introduced through characters who find themselves coming up with solutions through fantastical means as outlets for their pain. In "She Who Fell in Love with the Sky and Sea," an artist and an unlikely mythical muse come together to create the best art the world has ever seen, yet the art becomes unclaimable to the artist at the twisted eyes of her muse. In "Death Date," death has visited Sola through a psychic prediction arriving with perfect timing. She is given one year to live. Struggling with a traumatic past, her death date encourages Sola to live out the rest of her days and stop her original plans. The Switch explores the conditions of living in dystopian lands with a neighboring land that is a utopia. This novel explores the life of Sain as …
Date: May 2023
Creator: Perez, Andrea C.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Discriminative Control of Behavioral Variability in Video Game Play (open access)

Discriminative Control of Behavioral Variability in Video Game Play

Creativity can be a useful skill in today's classrooms and workplaces. When individuals talk about creativity, it's unclear what the controlling variables are when we tact behavior as "creative." Research in understanding the processes behind behaviors that are considered "creative" would assist in identifying functional relations and provide insight on how to teach creativity. Since creativity is often described as doing something different from the norm, behavioral variability may be a potential aspect of creativity. This study aimed to replicate previous findings by investigating the effects of discrimination training in a multiple schedule of varied and repetitive responding in the context of a video game. Participants played through a 2D online video game made in Bloxels. Different alternating-colored platforms served as the discriminative stimuli for the vary and repeat components. Three parameters of variability were measured (e.g., left jumps, right jumps, and double jumps). The results of the study indicate that participants were able to learn the discrimination of when to repeat and vary their responses depending on which colored platform they encountered.
Date: May 2023
Creator: Arias, Gabriela Isabel
Object Type: Thesis or Dissertation
System: The UNT Digital Library
"Doble Identidad" (open access)

"Doble Identidad"

Doble Identidad conveys my experience as someone who struggles with their cultural identity. Through the expository modes of self-reflexivity, participatory, experimental, and poetics, the film displays the factors that molded my cultural identity. My childhood memories and interactions with my loved ones help me tell the story of how my cultural identity has and continues to leave me with feelings of inadequacy of not being Mexican or American enough.
Date: May 2023
Creator: Huerta-Ortega, Katherine Leilani
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Effects of Hypoxia Responses during Moderate- and Severe-Intensity Exercise Performed to Exhaustion

The purpose of the study was to investigate the effects of hypoxia responses during moderate- and severe-intensity exercise performed to exhaustion. Nine healthy university students, five men, and four women (mean ± SD, age, 23 ± 1 y; height 167 ± 8 cm; weight 73 ± 7 kg) performed a cycle ergometer test in normoxia and hypoxia conditions. Cardiorespiratory, metabolic, and perceptual responses were measured during moderate-intensity and during severe-intensity exercise. During moderate-intensity exercise, hypoxia exaggerates the cardiorespiratory and ventilatory responses and delays the attainment of the steady state VO2 kinetics. However, during severe-intensity exercise, compensatory responses were not adequate, oxygen demand was slightly increased and VO2 max was reduced in hypoxia affecting the overall performance. Therefore, the greater reliance on the anaerobic pathways could have a serious implication on the performance of the exercise over a wide range of intensities.
Date: May 2023
Creator: Kumawat, Mandeepa Mohanlal
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Evaluating an Exchange Program for the Treatment of Problem Behavior Maintained by Access to Tangibles (open access)

Evaluating an Exchange Program for the Treatment of Problem Behavior Maintained by Access to Tangibles

Previous studies, typically with children, have used delay-tolerance training to treat problem behavior maintained by access to tangibles. This often involves physical prompting and waiting rather than exchanging, two practices that may not be possible or relevant to adults with intellectual disabilities (ID). For many adults with ID in residential settings, exchanging items, rather than waiting per se, may be evocative for problem behavior. In the current study, I evaluated an exchange program to treat problem behavior maintained by access to tangibles for adults diagnosed with ID at a residential facility. I measured the latency to exchange low- and high-preference items following a request for the item and the individual's problem behaviors. Results demonstrated that the exchange program increased relinquishing of an item while decreasing the rate of problem behavior. This analysis provides another method to treat problem behavior maintained by access to tangibles for adults without using physical prompting.
Date: May 2023
Creator: Bauer, Melanie Sue
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Evaluating Stack Overflow Usability Posts in Conjunction with Usability Heuristics

This thesis explores the critical role of usability in software development and uses usability heuristics as a cost-effective and efficient method for evaluating various software functions and interfaces. With the proliferation of software development in the modern digital age, developing user-friendly interfaces that meet the needs and preferences of users has become a complex process. Usability heuristics, a set of guidelines based on principles of human-computer interaction, provide a starting point for designers to create intuitive, efficient, and easy-to-use interfaces that provide a seamless user experience. The study uses Jakob Nieson's ten usability heuristics to evaluate the usability of Stack Overflow posts, a popular Q\&A website for developers. Through the analysis of 894 posts related to usability, the study identifies common usability problems faced by users and developers, providing valuable insights into the effectiveness of usability guidelines in software development practice. The research findings emphasize the need for ongoing evaluation and improvement of software interfaces to ensure a seamless user experience. The thesis concludes by highlighting the potential of usability heuristics in guiding the design of user-friendly software interfaces and improving the overall user experience in software development.
Date: May 2023
Creator: Jalali, Hamed
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Examining the Links between Narcissism Domains and Self-Concept Clarity, Self-Esteem, Attachment, Emotion Regulation, and Aggression

Narcissism is currently being redefined as a multidimensional construct. While some researchers hold that narcissism remains a unidimensional phenomenon, others have suggested that bi- and tridimensional conceptualizations may better represent the construct as well as align more succinctly with the experiences of individuals with varying levels of narcissistic traits. Also, since the latter conceptualizations offer a broader assessment of narcissistic tendencies, they may provide greater accuracy in identifying differing narcissistic phenotypes (e.g., malignant vs vulnerable). Given the variety in conceptualizations of narcissism, it remains an open area as to how their respective domains are associated with various risk factors and behavioral outcomes, particularly within antagonistic forms of narcissism. This thesis explored the multidimensional approaches to defining narcissism and examined the associations between narcissistic traits and attachment style, self-concept, self-esteem, emotion regulation, and aggression. Also, the current study explored how differences in college degree (business vs. psychology) and gender may influence the expression of narcissism and associations with attachment style. Overall, the study provides results relevant for a tridimensional view of narcissism and adds to the literature on narcissism's link with factors involved in personality pathology, gender, and choice of college degree.
Date: May 2023
Creator: Guillot, Skyler Trace
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Experience Effects on Risk Perception and Protective Action Decision Making when Facing a Rare Tornado Threat (open access)

Experience Effects on Risk Perception and Protective Action Decision Making when Facing a Rare Tornado Threat

Damaging tornadoes are possible in all U.S. regions beyond the traditionally recognized "tornado alleys" in the southern plains and mid-south. Hence, this research examines how study participants respond to rare tornado events. Specifically, how disaster experiences affect risk perceptions and protective actions when facing a rare tornado event. This study used the protective action decision model (PADM) as the theoretical lens to investigate this issue. The PADM shows that personal characteristics, including personal disaster experience, could affect risk perceptions and how protective action decisions are made. This study applies the theory by recruiting 136 human subjects from the state of Washington to participate in a social experiment. The participants take part in a study that includes hypothetical tornado scenarios, ranging from thunderstorm warning to a tornado emergency then answering questions regarding the presented scenarios. Findings suggest that disaster experience and demographics influence how people perceive and respond to tornado disasters. Overall, people with direct and indirect tornado experiences showed significantly lower risk perceptions in the early stages of the threat when compared with those without any tornado experiences. Their tornado risk perceptions later increased when the threats were higher, and they tended to be more complacent regarding protective actions. This …
Date: May 2023
Creator: Stander, Barend
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Exploring Asian American and Pacific Islander Youth Identity Development in a Community Based Youth Program (open access)

Exploring Asian American and Pacific Islander Youth Identity Development in a Community Based Youth Program

Community based youth programs play a significant role in promoting positive youth identity development outside of the classroom. This can be particularly important for racialized groups such as Asian Americans and Pacific Islanders (AAPI). Based on ethnographic research conducted at Asian American LEAD, this thesis explores the effect of a five week summer program on AAPI youth identity development. Data collection methods include participant observation, a pre- and post- survey, and semi-structured interviews with staff, participants, and program alumni. The research findings highlight how ethnic and racial identity development is fostered through the creation of safe spaces, shared struggles with peers and staff, and recognition of one's AAPI identity.
Date: May 2023
Creator: Pham, Lena Trang
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Faulty Stimulus Control and Reduced Treatment Integrity: An Analysis of Position Biases (open access)

Faulty Stimulus Control and Reduced Treatment Integrity: An Analysis of Position Biases

When learning conditional discriminations, it is possible that faulty sources of control develop and interfere with acquisition. In 2021, Bergmann et al. reported the effects of different integrity levels (i.e., to what degree an intervention is implemented correctly) on undergraduate students' mastery of an arbitrary matching to sample task. They found that participants in the reduced integrity conditions at or below 80% were more likely to show stimulus biases (i.e., selecting a particular incorrect stimulus in the presence of a sample stimulus) than participants in integrity conditions at or above 85%. Bergmann et al. did not investigate whether participants were likely to show responding that was biased by position. A position bias is a type of faulty stimulus control that involves allocating more responses to one or a few positions (e.g., first, second, middle, left). We conducted a secondary analysis of data from Bergmann et al., and we used a chi-square goodness of fit test to identify which participants showed a position bias. We found 25 participants out of 168 with potential position biases. We used a chi-square test of independence to analyze the distribution of participants with biased responding by condition and did not find a statistically significant difference. …
Date: May 2023
Creator: Nielsen, Leif Erik
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Greater, Lesser, Guessers: A Look into the Hybridization of Greater and Lesser Prairie-Chickens (open access)

Greater, Lesser, Guessers: A Look into the Hybridization of Greater and Lesser Prairie-Chickens

My thesis focuses on the conservation consequences of the hybridization of Lesser Prairie-Chickens in Kansas. Specifically, examining how past land management practices altering the species ranges impact the distinctiveness of Lesser Prairie-Chickens. Each chapter is an individual publication that addresses if the Greater and Lesser Prairie-Chicken are distinct when applying the morphological and biological species concepts. Chapter 2 compares the evolutionary history and morphological construct of Lesser Prairie-Chickens and other Galliformes using morphometric analysis. Chapter 3 uses low-resolution microsatellite data to reflect recent changes at the population level. This study aims to observe the Greater and Lesser Prairie-Chicken using the morphological and biological species concepts, two of the many species concepts, to determine the distinctiveness and rate of hybridization for these closely related species.
Date: May 2023
Creator: Stein, Carleigh M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Healing Miracles in Ancient Jewish and Early Christian Literature (open access)

Healing Miracles in Ancient Jewish and Early Christian Literature

Jesus was a healer, but what may not be as obvious is that he started a legacy of healing. He passed on his skills and abilities to his followers at least three times. Though not as frequently, they continued to heal through the Book of Acts. The legacy continued in the Apocryphal Acts and other apocryphal materials spanning the early centuries of the common era. Secondary literature looks at modern scholarship and leans heavily into Rabbinic literature. Up to this point, other English-language works in healing have sorely lacked luster in providing. The exploration of the healing legacy of Jesus shifted to meet the skills and needs of the healers, patients, and communities involved. Further, the healings had a substantive resultant impact on various levels of socioeconomics for the parties, which is explored by reexamining each group type of healings, from lameness and paralytics to possession and resurrection, and more. The hope is that taking a holistic approach to these healings as possible will allow readers a new way of experiencing the early common era and these events that permeated everyone's lives at one time or another.
Date: May 2023
Creator: Tompkins, Lora E.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
How Receiving Communities Structure Refugee Settlement Experiences: The Case of Burmese Immigrants in DFW (open access)

How Receiving Communities Structure Refugee Settlement Experiences: The Case of Burmese Immigrants in DFW

The Dallas-Forth Worth Metroplex (DFW) serves as a diverse resettlement location for globally displaced refugees. While research examines how the nation impacts refugee resettlement, studies that examine the role of the city and community in placemaking are still lacking. In city resettlement investigations, research often focuses broadly on advocacy and political movements rather than the impacts of local-level structures and policies. In this paper, I develop an evaluation model using Jenny Phillimore's categories for successful refugee resettlement that examines how structural barriers, community interactions, and resource accessibility affect space and place for refugee populations. Through an ethnography of Chin and Rohingya refugee communities in DFW, I explore the differences between community-settled and state-settled refugee groups and the idea of an integrated resettlement program. Additionally, I argue that refugees who choose their settlement location in the United States are empowered and thus have a stronger connection to their host community than state-settled refugees. For example, in interviews, the Chin emphasized their ownership of Lewisville and feelings of home, while the Rohingya expressed feelings of placelessness and dispossession in Dallas. As governments push towards an entirely privatized system of refugee resettlement, this research argues for an integrated method that draws upon federal …
Date: May 2023
Creator: Stewart, Kaitlin Victoria
Object Type: Thesis or Dissertation
System: The UNT Digital Library
"Idle Flux": A Composer/Choreographer Collaboration (open access)

"Idle Flux": A Composer/Choreographer Collaboration

The following thesis documents the collaboration process behind Idle Flux, a collaboration between Samuel A. Montgomery, a graduate composer at University of North Texas, and Emily Jensen, a graduate choreographer at Texas Woman's University. Comprising an 18-minute stereo fixed media composition and choreography for seven dancers, Idle Flux seeks to challenge the traditional spatial relationship between audience members and performers through restructuring seating and stage arrangements while featuring immersive sound design in multiple venues. This thesis considers multiple sources of inspiration, including Immersive Van Gogh® Exhibit Dallas, John Jasperse's Canyon, Zoe | Juniper's BeginAgain, Francisco López's installations, Alexander Ekman's A Swan Lake, Imagine Dragons' "Enemy," Son Lux's "Dream State (Dark Day)," and Ryan Lott's dance compositions. This thesis also examines the interdependent collaborative relationship between composer and choreographer by considering the issues of autonomy and creative control, examining previous collaborative models proposed or implemented by Van Stiefel, José Limón and Norman Lloyd, John Cage and Merce Cunningham, Doris Humphrey and Norman Lloyd. In addition, this thesis discusses the creative process and foundational concepts behind the fixed media composition, including the use of sound samples, exploration of timbre through synthesizers, development of motives and musical language, and the spatialization of sound …
Date: May 2023
Creator: Montgomery, Samuel A.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Influence of Particle Morphology and Heat Treatment on the Microstructural Evolution of Silver Inks for Additively Manufactured RF Applications: A Comparison between Nanoflake and Reactive Inks (open access)

The Influence of Particle Morphology and Heat Treatment on the Microstructural Evolution of Silver Inks for Additively Manufactured RF Applications: A Comparison between Nanoflake and Reactive Inks

In recent years, advancements in additive manufacturing (AM) technologies have paved the way for 3D-printed flexible hybrid electronics (FHE) and created opportunities for extending these gains to RF applications. However, printed metal interconnects and devices are typically characterized by high porosity and chemical impurities that significantly limit their electrical conductivity and RF performance compared to bulk equivalents. Using direct ink writing (DIW), two silver inks, a nanoflake suspension and a nanoparticle-reactive ink, were investigated to understand the relationship between free interfacial energy, sintering behavior, DC conductivity, and RF loss. The printed silver samples were characterized using scanning electron microscopy, x-ray diffraction, and x-ray photoelectron spectroscopy to monitor microstructural evolution, grain size and orientation, and chemical purity as a function of heat treatment temperature. Three heat treatments were applied to each ink: the manufacturer's recommendation, 225°C for 30 minutes, and 350°C for 30 minutes. Four-wire structures and coplanar waveguides were printed to compare the DC and RF performance up to 18 GHz, respectively. The results show that ink formulations that facilitate larger grains, high density, and good chemical purity have superior RF performance. A low resistivity of 1.4 times bulk Ag, average of 0.8% greater RF loss factor than evaporated Ag, …
Date: May 2023
Creator: Summers, Jason Masao
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Intermodal Stimulus Compounding with Ambient Odors Produces Averaging in Rats (open access)

Intermodal Stimulus Compounding with Ambient Odors Produces Averaging in Rats

In an organism's natural environment, there are always an uncountable number of stimuli, and stimulus features, available to gain control over behavior. When these component stimuli are presented simultaneously, this new stimulus compound can occasion a previously unseen effect on behavior. Stimulus compounding is a method used to better understand how variables in stimulus features may impact the final effect on an organism's responding when presented with a stimulus compound. While stimulus compounding experiments are often conducted using intermodal tone and light stimuli, it is conducted far less often using intramodal stimuli, potentially due to the competing stimulus features of same-modality stimuli. Even less conducted research has been done using two odor component stimuli, despite the large impact odor has on many species' behavior. The purpose of this study was to conduct a stimulus compounding experiment using intramodal ambient odor stimuli in rats, to see what kind of effect a mixed odor compound would have on the subject's behavior. This was done using a wind tunnel designed operant chamber, where both subjects were trained to respond to independently presented odor stimuli. Following training a compound mixture of both component odors was presented to the subjects. The results of this study …
Date: May 2023
Creator: Kirkland, Sophia B.
Object Type: Thesis or Dissertation
System: The UNT Digital Library