bluuebunny/crossref_metadata_2025 huggingface dataset:
African American Student Placement in Disciplinary Alternative Education Programs
Authors:   , Foss Ivy
Published: February 2025

The purpose of this study was to determine the relationship (predicative capability) between selected variables, specifically, African American student enrollment, teacher ethnicity, and urban or rural district classification and the number of African American student placements in a disciplinary alternative education program (DAEP). The study used a non-experimental ex post facto design. Archival data from the Texas Education Agency were used to identify Texas schools that sent African American students to a DAEP during the 2013-2014 school year. Archival data from the Texas Education Agency were also used to identify African American student enrollment and teacher ethnicity for the selected school districts. Finally, archival data from the Texas Department of Agriculture were used to identify district classifications of urban or rural. Participants in this study consisted of 187 school districts that placed African American students in a DAEP during the 2013-2014 school year. Based on the findings, teacher ethnicity and African American student enrollment are statistically significant contributions to African American student placement in a DAEP. Urban or rural district classification is not a statistically significant predictor in the same placements. Results of this study add to existing literature by confirming that there is an overrepresentation of African American student placements in DAEPs and suggesting possible ways to combat this epidemic.
Phenotypic Analysis of Medicago truncatula NPF1.7 Over-Expressing Plants Grown under Different Nitrate Conditions
Authors:   , Cai Jingya
Published: February 2025

Plants have many nitrate transporters; in the model legume Medicago truncatula, MtNPF1.7 is among them. MtNPF1.7 is important for M. truncatula growth and it has been established that MtNPF1.7 is a high affinity nitrate transporter. M. truncatula plants with mutations in MtNPF1.7 gene show defects during plants growth, with striking abnormalities in nodule development and root architecture. Nitrogen fixation is an energy expensive process; when legumes have sufficient bioavailable nitrogen like nitrate available, it suppresses nodulation and nitrogen fixation. Previous preliminary results in our lab showed that plants constitutively expressing MtNPF1.7 have a growth phenotype in the absence of nitrate, but no data was available on how M. truncatula plants constitutively expressing MtNPF1.7 are affected by the presence of nitrate. For my research, I confirmed the preliminary results on the growth of M. truncatula plants overexpressing NPF1.7 and examined these plants' phenotypes when nitrate was not provided in the growth media and when it was provided at two different concentrations. Compared with wild type A17, plants constitutively expressing MtNPF1.7 gene grow larger, have more lateral roots and more nodules when grown in the absence of nitrate and when 0.2 mM KNO3 was provided. At 1 mM KNO3, there are fewer differences between wild type A17 and plants constitutively expressing the MtNPF1.7 gene. Compared with wild type A17, plants constitutively expressing the MtNPF1.7 gene flower earlier, which indicates MtNPF1.7 gene may have a function in plant flowering.
Niche Expansion of an Invasive Predator (Neovison vison), Prey Response, and Facilitative Interactions with Other Invasive Mammals at the Southern End of the Americas: Conservation Challenges and Potential Solutions
Authors:   , Crego Ramiro Daniel
Published: February 2025

The Cape Horn Biosphere Reserve is located at the southern tip of South America. This large archipelago is considered one of the last pristine areas left on the world. Despite it being an unpopulated area with most of the native forest cover intact, it has not been exempt from biological invasions, one of the major drivers of biodiversity loss. Three species that naturally interact in their native range in North America – American beavers (Castor canadensis), muskrats (Ondatra zibethicus), and American mink (Neovison vison) – were independently introduced in this remote region. In my dissertation, I investigated (i) the hypothesis of niche expansion in the invasive mink population on Navarino Island towards terrestrial habitats; (ii) potential mink impact on breeding success of forest-bird populations; (iii) habitat selection of small-rodent species and their perception on the mink's novel predation risk; and (iv) the dynamics of multiple-species invasions under the hypothesis of an invasional meltdown. Additionally, I worked within the framework of environmental philosophy. I provide an example of combining ecological and cultural dimensions within the International Long-Term Ecological Research network to disentangle the ethical dilemmas that surround the management of invasive species. I finally proposed a management plan based on the idea of multiple invasive species management, discussing potential solutions to overcome the challenges that the control of invasive species represent and to more effectively protect the biological integrity of the native ecosystems.
Slogan Word Count and the Effects on Consumer Behavior
Authors:   , Scro Paige
Published: February 2025

Slogans can be attributed as a way in which to communicate a brand's message to its key consumer. An effectively established brand amongst targeted consumers can in turn generate profitability and ever further promote the brand. The purpose of this paper was to investigate the effectiveness of advertisements that employ vague or precise cosmetic product brand slogans among both male and female consumers. Ultimately, the end goal of marketing is to make a sale. Additionally, the purpose of this study was to determine whether or not the length of a slogan is an influential factor on the participant's motivation to purchase a cosmetic or skincare product. Data was collected through the use of survey in an online social media format, in order to test the effectiveness of different lengths of slogans for slogan recall, brand recall, brand awareness and purchase intention. Prior research and hypotheses were used to predict the concept that shorter more concise or precise slogans in this study would heighten the levels of all measured variables in the study, slogan recall, brand recall, brand awareness and purchase intention. The results of this paper conclude overall vague slogans have the potential to reach higher levels of slogan recall ability , brand recall and the intent to purchase, on the contrary shorter more precise slogans affect brand awareness at a greater level than the lengthier slogans.
Effects of Disasters on Local Climate Actions: Climate Change Mitigation and Adaptation Actions
Authors:   , Kim Kyŏng-u
Published: February 2025

This dissertation investigates the effects of natural disasters and political institutions on municipalities' climate change policies. Although most theoretical frameworks on policy adoption highlight the roles of extreme events as exogenous factors influencing policy change, most studies tend to focus on the effects of extreme events on policy change at the national level. Additionally, the existing theoretical frameworks explaining local policy adoption and public service provision do not pay attention to the roles of extreme events in local governments' policy choices. To fill those gaps, this dissertation explores the roles of natural disasters and political institutions on municipal governments' climate change policies. It does this by applying the theory of focusing events to local climate mitigation and adaptation actions. Based on the policy change framework, the political market model, and the institutional collective action frameworks, this dissertation develops and tests hypotheses to examine the effects of natural disasters and political institutions on municipalities' climate mitigation and adaptation policies. The dissertation uses 2010 National League of Cities (NLC) sustainability surveys and the 2010 International City/County Management Association (ICMA) sustainability survey to test the hypotheses. Analytical results show that floods and droughts influence local climate change policies and suggest that local governments can take advantage of extreme events when initiating a policy change. The results also suggest that political institutions can shape the effects of natural disasters on municipalities' climate mitigation and adaptation actions.
Preservice Teachers' Beliefs about Writing and Their Plans to Teach Writing: The Apprenticeship of Observation
Authors:   , Thompson Emily Kyle
Published: February 2025

Preservice teachers (PSTs) bring a plethora of knowledge and experiences to their educator preparation courses. The PSTs have also formed ideas about how to teach based on their observations during the thousands of hours they spent as students in the classroom from kindergarten through high school graduation. This phenomenon, coined by Lortie, is called the apprenticeship of observation. Past research has focused on the apprenticeship of observation in general while neglecting to specifically explore how this phenomenon influences PSTs in regards to writing. Guiding this study were three research questions: (1) what are the PSTs' beliefs about writing instruction and themselves as writers, (2) how have PSTs' experiences as students affected their beliefs about themselves as writers, and (3) how do PSTs' experiences as students influence their plans to teach writing? After conducting a thematic analysis, there are four findings that stemmed from the data. First, PSTs come to their educator preparation programs with beliefs about themselves as writers. Particularly, the PSTs believe they are either writers or non-writers, Next, PSTs believe that writing instruction should be high-quality and foster student interest. Additionally, data suggested that PSTs' past experiences as students in a writing classroom influenced the PSTs' beliefs. Particularly, the PSTs' experiences around feedback and the control they had over writing were the most discussed. Lastly, past experiences stemming from the PSTs' apprenticeship of observation formed the basis for the plans the PSTs had about teaching writing. These findings have implications for both teacher educators and the PSTs they teach. It is imperative that teacher educators take steps to uncover the beliefs and past experiences of the PSTs as these serve as a lens through which the PSTs look through during their writing methods courses. Teacher educators must also use this information as a springboard for instruction. Finally, teacher educators must challenge the apprenticeship of observation to ensure that the plans PSTs have for teaching writing are not simply a conservative recreation of past experiences devoid of a theoretical basis.
Examination of a Bi-Directional Relationship between Urgency and Alcohol Use
Authors:   , Blackledge Sabrina
Published: February 2025

The proposed study examined whether negative urgency and positive urgency are dynamic traits that hold bi-directional relationships with binge and prolonged alcohol use across time. Individuals between the ages of 18-30 were recruited from Amazon Mechanical Turk (MTurk; n = 179) and university student (n = 66) pools. Participants completed three batteries of self-report assessments approximately 30 days apart, each containing measures assessing negative and positive urgency, as well as drinking frequency and binge behavior during the prior month. Latent variable cross-lagged panel models examined the effects of alcohol use from the previous month on negative and positive urgency while controlling for concurrent and autoregressive effects. Results of the current study indicated that for the full sample, there was not an effect for the influence of binge/prolonged drinking on either negative or positive urgency during the subsequent month. However, when examined separately by sample (Turkers vs. university) and gender (male vs. female), significant effects were found more for individuals who were Turkers, male, and/or heavy drinkers, suggesting that increases in positive and negative urgency at Time 2 could be partially explained by variance in drinking patterns at Time 1 for these individuals. However, these relationships were not replicated again between Time 2 and Time 3 due to a decrease in all drinking behaviors during these times. Lastly, the study found that while urgency scores were related to psychosocial problems and dependence symptoms associated with drinking, there was no evidence to support that urgency scores had substantial relationships to specific frequency and/or bingeing behavior across the overall sample, although positive urgency had support for a relationship with bingeing, particularly among heavily drinking men. Thus, while the primary findings did not indicate any effects for a general sample of young adults, the effects observed among heavy male drinkers in the present study add to a growing body of literature indicating potential for interactive effects among personality, environmental, and sociobiological factors across the trajectory of the human lifespan. Future research that continues to examine urgency and how it relates to alcohol use in longitudinal contexts, utilizing diverse samples, is warranted.
Stories about Culture, Education, and Literacy of Immigrant Graduate Students and Their Familes
Authors:   , Mirza Hala
Published: February 2025

Every year many immigrant families become members of United States communities. Among these are international graduate students whose lives and identities, as well as those of their families, are changed as they negotiate between cultures and experiences. In this study, three Saudi graduate students share their stories about culture, education and literacy. This research employs narrative inquiry to answer the following question: What stories do Saudi immigrant students tell regarding their educational beliefs and experiences, as well as the experiences of their children in the U.S. and in Saudi Arabia? The participants' interview texts are the main data source. The three-dimensional narrative inquiry spaces of temporality, sociality, and place help identify the funds of knowledge in place throughout these narratives. Data analysis uses funds of knowledge as a theoretical lens to make visible the critical events in each narrative. These events point to themes that support the creation of a third space in which the participants negotiate being in two cultures as well as their storying across time to understand their own experiences. Themes of facing challenges, problem solving, adaptation, and decision-making connect these stories and support the discussion of findings within the personal, practical, and social justifications for this narrative inquiry. The participants' negotiation of being in two cultures as revealed here serves as a resource for educators in understanding the instructional needs of immigrant families. The findings also have the potential to contribute to changing existing misconceptions about this minority group and other immigrant groups. In a rapidly growing global community as the United States, such narratives provide insights that invite personal understandings and connections among diverse people.
Employee Satisfaction with Supervisor Support: The Case of Direct Care Workers in Nursing Homes
Authors:   , Whitaker Lisa C.
Published: February 2025

The nursing home industry has been saturated for decades with culture change initiatives in an effort to improve resident quality of care. The direct care worker (DCW) is considered a critical position to achieving nursing facility quality improvements. Understanding what leads to job satisfaction for DCWs could result in improved resident care. The relationship DCWs have with their direct supervisor or upper-level manager can impact employee satisfaction. The purpose of this research is to identify factors that are associated with DCWs satisfaction with supervisor and management support. Data was obtained from 307 DCWs who were employed at 11 North Texas nursing homes. It was expected that factors affecting satisfaction with direct supervision and upper-level management would differ. In fact, the study found that the antecedents for employee satisfaction with supervisor support were participative decision-making/empowerment, age, information exchange and feedback. Furthermore, participative decision-making/empowerment, perceived competence, staffing, information exchange and feedback were found to affect direct care workers' satisfaction with manager support. In conclusion, this research provides a starting point towards a more holistic view of employee satisfaction with supervisor support by considering the preceding factors and its subsequent effects.
Examining the Influence of Visual Culture on a Saudi Arabian Child's Drawings
Authors:   , Alshaie Fouzi
Published: February 2025

This study examines the ways visual culture influences a child's drawings. The child is my 9-year-old daughter Nada, who was born in Saudi Arabia and is a fourth-grade student temporarily living in the United States. The study uses qualitative methods of data collection and exploratory case study research design as a methodology. The data were analyzed in light of Althusser's theory of ideology, specifically the notion of interpellation, along with visual culture theories. In addition, gender performativity theory, specifically the work of Judith Butler, was used to consider gender issues when these concerns emerged from the study. Nada has been exposed to two diverse cultures, those of Saudi Arabia and the United States. Both cultures may impact Nada's interpretations of her visual surroundings in various ways. Therefore, recognizing and examining how she interacts with US visual culture might help to uncover how such interactions constitute the basis of her perceptions, identities, and critical thinking. Drawing is not only a means of self-expression but also an important function of communication, identity formation, and represents possible ways of being in the world that are related to culture, community, and society as a whole. The study begins with the premise that there is a gap in understanding between the importance of visual culture and its insufficient application in Saudi Arabian art education. The implications of this study may be informative for Saudi Arabian educators, individuals, or groups interested in visual culture education and children's drawings; potentially, the Saudi Arabian educational system may also use this study to enhance its appreciation of the impact of visual culture on the creation of art and knowledge.
These Walls Can Talk: An Ethnographic Study of the Interior Schoolscape of Three High Schools
Authors:   , Hamilton Joshua
Published: February 2025

The schoolhouse is a place in which messages for student consumption are typically found with classroom lectures, text, and activities. As with any social setting, however, the communication is not confined to one space but extends, in this case, to hallways, common spaces, and exterior of the building. One of the most common practices for the delivery of messages to students within the schoolhouse is through visual signage. Visual signage can traverse disciplines encompassing concepts from the fields of communication, semiotics, language, literacy, and even interior design. In an effort to understand the impact these signs have on student populations this dissertation asks the question: How are signs within public high schools produced, consumed, and influential to persons in contact with intended messages that are presented in public school spaces? The study utilizes ethnography to describe the production, consumption, and influence of fixed signs in the interior hallways and common spaces at three public high schools in Texas. At each campus, student volunteers, one from each grade level, provided their individual course schedule to follow their daily route from class to class at their particular high school. Post these observations these students engaged in focus groups to discuss the various signs displayed on their campus. In addition, faculty/staff members from each high school volunteered to participate in a separate faculty/staff focus group to discuss the use of signage in schools and the observations made by both the students and myself during the observations. The data suggest that district directives and social happenings guide the production of messages for each campus. The consumption and influence of these messages though is far more complex as a variety of factors contributed to the student and faculty/staff consumption, or lack thereof, and influence to action. As ethnography, this dissertation sheds light onto these complexities revealing that a host of external and internal issues dictate the messages displayed through school signage within the individual schoolhouse.
Spectrum Analysis and Prediction Using Long Short Term Memory Neural Networks and Cognitive Radios
Authors:   , Hernandez Villapol Jorge Luis
Published: February 2025

One statement that we can make with absolute certainty in our current time is that wireless communication is now the standard and the de-facto type of communication. Cognitive radios are able to interpret the frequency spectrum and adapt. The aim of this work is to be able to predict whether a frequency channel is going to be busy or free in a specific time located in the future. To do this, the problem is modeled as a time series problem where each usage of a channel is treated as a sequence of busy and free slots in a fixed time frame. For this time series problem, the method being implemented is one of the latest, state-of-the-art, technique in machine learning for time series and sequence prediction: long short-term memory neural networks, or LSTMs.
Investigating Factors that Affect Faculty Attitudes towards Participation in Open Access Institutional Repositories
Authors:   , Tmava Ahmet Meti
Published: February 2025

Open access institutional repositories (OA IRs) are electronic systems that capture, preserve, and provide access to the scholarly digital work of an institution. As a new channel of scholarly communications IRs offer faculty a new way to disseminate their work to a wider audience, which in turn can increase the visibility to their work and impact factors, and at the same time increase institutions prestige and value. However, despite the increased popularity of IRs in numbers, research shows that IRs remain thinly populated in large part due to faculty reluctance to participate. There have been studies on the topic of open access repositories with the focus on external factors (social or technological context) that affect faculty attitudes towards participation in IRs, and there is a lack of understanding of the internal factors and the psychology of the reluctance. The goal of this mix method study was to identify the overall factors that affect faculty attitudes towards participation in IRs and examine the extent to which these factors influenced faculty willingness to participate in IRs. First, from literature review and the Model of Factors Affecting Faculty Self-Archiving this study identified eleven factors that influenced faculty members' intention to participate in OA repositories. Theory of Planned Behavior (TPB) postulated that faculty intention to participate in IR was determined by three categories of factors: five attitudinal, four external (social) and two individual factors. Within the framework of the TPB this study (1) confirmed the measurement scale for each factor using principal component analysis, (2) it examined the influence that each factor had on the faculty likelihood to participate in IR using logistic regression, and (3) it weighted the relative importance of each factor on faculty intent to participate, utilizing relative weight analysis. Quantitative analysis revealed that four out of 11 factors proved to be statistically significant in faculty members' intention to participate in IRs; difficulty with the submission process, discoverability access and readership, altruism, and faculty perception of IRs as low-quality publishing venues. While qualitative analysis revealed that more than half of the faculty remain unfamiliar with OA and its goals, and while they supported the principles of OA, they also had a myriad of concerns regarding participation in IRs.
Understanding Perceptions of Community Gardens in the Dallas Area
Authors:   , Ayyad Raja
Published: February 2025

This exploratory research focuses on identifying the roles and perspectives of community gardens in the Dallas area. Results from semi-structured interviews reveal the social and political makeup of the neighborhoods where the garden projects in this study are located. While these findings highlight the benefits of gardening in the city, they can also be contested spaces. In advocating for the proliferation of garden projects in the city, community organizations would benefit from understanding the nuances of garden initiatives and the way in which they are perceived by members of the garden, nearby residents, and policy makers.
Replenishment: A Musical Narrative Inspired by Sleep
Authors:   , Espinel Miguel Angel
Published: February 2025

The Replenishment cycle contains five works that allude to the experience of sleep, beginning with awake drowsiness and ending with the piece inspired by rapid eye movement (REM) sleep, titled Conceiving Realities. This last piece is an intermedia work composed for chamber ensemble, live painting with biofeedback, computer, and audiovisual processing. This critical essay describes the composition of Conceiving Realities within the context of the Replenishment cycle, followed by a thorough analysis of the research involved in the technological aspects of the piece, and finally, a description of the instrumentation, notation, intermedia elements, and technology comprising the work. Conceiving Realities uses a system of interactions between painting, biofeedback, music, and video, in which a painter wears brainwave and heartbeat sensors that send data to a computer patch processing the sound of an ensemble as the painter listens and creates the painting while responding to the music. This requires a passive biofeedback system in which the painter is focused on listening and painting. The computer uses the data to process existing sounds, instead of synthesizing new lines. The score blends elements of traditional notation, graphics, and guided improvisation; giving the performers some creative agency. This alludes to the way in which scenarios in dreams occur without voluntary control of the dreamer. Finally, a camera captures the painting and projects three video screens applying individual types of processing to the original video stream, controlled in real time by the amplitude of the ensemble. All these elements create an immersive experience for the audience that is mediated by the interaction of sight and sound.
Civil Liberties and National Unity: Reaction to the Sedition Act in the Southern States, 1798
Authors:   , Robinson Sarah Elizabeth
Published: February 2025

The traditional narrative of political party development in the United States of America during the latter half of the 1790s ascribes the decline in popularity of the Federalist Party in the Election of 1800 to that party's passage of controversial legislation, specifically the Sedition Act of 1798, prior to the election. Between the passage of the Sedition Act and the Election of 1800, however, the midterm elections of 1798-1799 transpired and resulted in a significant increase in Federalist popularity in four states – North Carolina, South Carolina, Georgia, and Virginia. This study seeks to ascertain why these four states increased their support for the Federalist Party in 1798-1799, despite the passage of the Sedition Act by the Federalist Party. By examining newspapers and election results, this study analyzes the reaction of these four states to the passage of the Sedition Act and finds that generally, these states did not react strongly against the Sedition Act in the immediate aftermath of its passage. Instead, all four states urged national unity and emphasized the need to support the national government because the United States faced the threat of war with France. This study employs a state-by-state formula to determine each state's individual reaction to the Sedition Act and the Quasi-War, finding that ultimately, the Sedition Act did not have as significant of an impact in these states as the popular narrative holds.
The Effectiveness of Peer Mentoring with High School Student Mentors and Child Mentees
Authors:   , Dafoe Eric C.
Published: February 2025

This randomized, controlled study examined the effectiveness of two mentoring programs, child mentor relationship training (CMRT) and peer assistance and leadership (PAL®), on high school mentor empathic behaviors and child mentee behavior problems. Participants were 60 young, at-risk students (61.7% male; 38.3% Hispanic/Latino/a, 31.7% Caucasian, 21.7% African American, 8.3% biracial) and 30 high school students (53.3% male; 66.7% Caucasian, 26.7% Hispanic/Latino/a, 0.03% African American, 0.03% Asian). Mentors and mentees were randomly assigned to CMRT or PAL®, which was treatment as usual in the participating school district. Results from 2 (group) by 2 (time) repeated measures ANOVAs indicated compared to the PAL® treatment group over time, mentors in the CMRT group demonstrated statistically significant improvement in empathic behaviors with a large treatment effect, as rated by independent observers. Analysis revealed a moderate treatment effect with CMRT group mentee behavior problems, but the difference was not statistically significant between treatment groups over time. Further analysis revealed the CMRT group demonstrated statistically significant reductions in behavior problems from pre- to post-test with a very large treatment effect. Overall, findings support CMRT as a promising school-based intervention for at-risk young children that potentially increases school counselor efficiency.
Phylogenetic and Functional Characterization of Cotton (Gossypium hirsutum) CENTRORADIALIS/TERMINAL FLOWER1/SELF-PRUNING Genes
Authors:   , Prewitt Sarah F.
Published: February 2025

Plant architecture is an important agronomic trait driven by meristematic activities. Indeterminate meristems set repeating phytomers while determinate meristems produce terminal structures. The centroradialis/terminal flower1/self pruning (CETS) gene family modulates architecture by controlling determinate and indeterminate growth. Cotton (G. hirsutum) is naturally a photoperiodic perennial cultivated as a day-neutral annual. Management of this fiber crop is complicated by continued vegetative growth and asynchronous fruit set. Here, cotton CETS genes are phylogenetically and functionally characterized. We identified eight CETS genes in diploid cotton (G. raimondii and G. arboreum) and sixteen in tetraploid G. hirsutum that grouped within the three generally accepted CETS clades: flowering locus T (FT)-like, terminal flower1/self pruning (TFL1/SP)-like, and mother of FT and TFL1 (MFT)-like. Over-expression of single flower truss (GhSFT), the ortholog to Arabidopsis FT, accelerates the onset of flowering in Arabidopsis Col-0. In mutant rescue analysis, this gene driven by its native promoter rescues the ft-10 late flowering phenotype. GhSFT upstream sequence was used to drive expression of the uidA reporter gene. As anticipated, GUS accumulated in the vasculature of Arabidopsis leaves. Cotton has five TFL1-like genes, all of which delay flowering when ectopically expressed in Arabidopsis; the strongest phenotypes fail to produce functional flowers. Three of these genes, GhSP, GhTFL1-L2, and GhBFT-L2, rescue the early flowering tfl1-14 mutant phenotype. GhSPpro:uidA promoted GUS activity specifically in plant meristems; whereas, other GhTFL1-like promoters predominately drove GUS activities in plant vascular tissues. Finally, analysis of Gossypium CETS promoter sequences predicted that GhSFT, GhSP, GhTFL1-L1, GhTFL1-L2 and GhBFT-L2 are regulated by transcription factors involved in shoot and flowering development. Analysis of cotton's two MFT homologs indicated that neither gene functions to control shoot architecture. Our results emphasize the functional conservation of members of this gene family in flowering plants and also suggest this family as targets during artificial selection of domestication.
Estimating Thermal Conductivity and Volumetric Specific Heat of a Functionally Graded Material using Photothermal Radiometry
Authors:   , Koppanooru Sampat Kumar Reddy
Published: February 2025

Functionally graded materials (FGMs) are inhomogeneous materials in which the material properties vary with respect to space. Research has been done by scientific community in developing techniques like photothermal radiometry (PTR) to measure the thermal conductivity and volumetric heat capacity of FGMs. One of the problems involved in the technique is to solve the inverse problem, i.e., estimating the thermal properties after the frequency scan has been obtained. The present work involves finding the unknown thermal conductivity and volumetric heat capacity of the FGMs by using finite volume method. By taking the flux entering the sample as periodic and solving the discretized 1-D thermal wave field equation at a frequency domain, one can obtain the complex temperatures at the surface of the sample for each frequency. These complex temperatures when solved for a range of frequencies gives the phase vs frequency scan which can then be compared to original frequency scan obtained from the PTR experiment by using a residual function. Brute force and gradient descent optimization methods have been implemented to estimate the unknown thermal conductivity and volumetric specific heat of the FGMs through minimization of the residual function. In general, the spatial composition profile of the FGMs can be approximated by using a smooth curve. Three functional forms namely Arctangent curve, Hermite curve, and Bezier curve are used in approximating the thermal conductivity and volumetric heat capacity distributions in the FGMs. The use of Hermite and Bezier curves gives the flexibility to control the slope of the curve i.e. the thermal property distribution along the thickness of the sample. Two-layered samples with constant thermal properties and three layered samples in which one of the layer has varying thermal properties with respect to thickness are considered. The program is written in Fortran and several test runs are performed. Results obtained are close to the original thermal property values with some deviation based on the stopping criteria used in the gradient descent algorithm. Calculating the gradients at each iteration takes considerable amount of time and if these gradient values are already available, the problem can be solved at a faster rate. One of the methods is extending automatic differentiation to complex numbers and calculating the gradient values ahead; this is left for future work.
Artscapes: Community Perceptions of City Beautification through Murals in Denton, Texas
Authors:   , Robertson Lindsey Morgan
Published: February 2025

Keep Denton Beautiful (KDB) is inspired by Keep America Beautiful's model of community engagement to create a clean, beautiful, and vibrant city. The community mural initiative, Artscapes, aims to enliven public spaces, abate graffiti, and inspire community members to keep Denton, Texas, clean and beautiful. The goals of this research project are to understand the impact of Artscapes initiative, community perceptions of public art, and find ways KDB can better align future mural projects with the needs and desires of community members. By talking to artists that have worked with KDB, members of the mural art committee, and community members from the neighborhoods that have existing murals, this research provides input from these three populations to continue creating public art for the Denton community. I discuss the context of my work through Lefebvre's concept of "Right to the City," Rafael Schacter's opposition between sanctioned and non-sanctioned murals, Bourdieu's concept of symbolic and social capital, and David Harvey's work on neoliberalism and the entrepreneurial city.
An Analytical Perspective of the Developing Aesthetic Concepts in Sergey Prokofiev's Choses en soi, Op. 45
Authors:   , Liu Tzu-Yi
Published: February 2025

The purpose of this study is to analyze the compositional techniques in Choses en soi op.45, by Sergey Prokofiev, and to explore the new aesthetic concepts he claimed to include in this composition. Through the examination of the compositional elements and discussion of its salient characteristics.
Using Concurrent Schedules of Reinforcement to Decrease Behavior
Authors:   , Palmer Ashlyn
Published: February 2025

We manipulated delay and magnitude of reinforcers in two concurrent schedules of reinforcement to decrease a prevalent behavior while increasing another behavior already in the participant's repertoire. The first experiment manipulated delay, implementing a five second delay between the behavior and delivery of reinforcement for a behavior targeted for decrease while no delay was implemented after the behavior targeted for increase. The second experiment manipulated magnitude, providing one piece of food for the behavior targeted for decrease while two pieces of food were provided for the behavior targeted for increase. The experiments used an ABAB reversal design. Results suggest that behavior can be decreased without the use of extinction when contingencies favor the desirable behavior.
Impact of Relational Incongruity on Customer Ownership and Sales Outcome Performance: A Resource-Advantage Theory Approach
Authors:   , Fergurson Ricky
Published: February 2025

There exists heightened research attention afforded to the pivotal demands - both internal and external - that exist within the salesperson role set. Unprecedented pressures on salespersons to acquire, retain, and build enduring customer relationships to enhance the firm's bottom-line performance coincides with increasing complexities within the work environment. This relevant and timely research introduces an original construct derived from the long-standing attention afforded to relationship selling, relational incongruity that exists within the buyer-seller exchange. Relational incongruity, defined, is the relational tension spawned between the salesperson, the customer, and the firm when situational psychological incongruity exists within the buyer-seller exchange itself. Framed in resource-advantage theory, this research investigates divergent demands and the increasing complexity of sales relationships through the lens of relational incongruity. A research program based on minimizing relational incongruity will augment the sales management and B2B literature by looking at how he salesperson and the customer build strong relationships as well as the antecedents that can undermine these relationships by generating realtional incongruity.
Effects of HALSs and Nano-ZnO Worked as UV Stabilizers of Polypropylene
Authors:   , Lu Xinyao
Published: February 2025

This work reports the outdoor weathering performance of ultraviolet (UV)-stabilized polypropylene (PP) products (using PP resins from Encore Wire). Different hindered amine light stabilizers (HALSs) and nano-ZnO were used to stabilize PP-film-based formulations that were exposed under UV light for 6 weeks simulating for in harsh outdoor weather of Dallas, Texas, USA in 2016. Characterization of the exposed PP film products was done in terms of mechanical and friction spectroscopic properties. The PP film formulations were divided into 15 categories based on the type of HALS and nano-ZnO incorporated. This was done to derive meaningful comparison of the various film formulations. Following exposure under UV light, the lifetimes of certain formulations were determined. On the basis of the mechanical and friction properties, it was determined that generally, the HALS or nano-ZnO stabilized PP film give better properties and if those two kinds of UV stabilizers can work together.
Core-Shell Based Metamaterials: Fabrication Protocol and Optical Properties
Authors:   , De Silva Vashista C.
Published: February 2025

The objective of this study is to examine core-shell type plasmonic metamaterials aimed at the development of materials with unique electromagnetic properties. The building blocks of metamaterials under study consist of gold as a metal component, and silica and precipitated calcium carbonate (PCC) as the dielectric media. The results of this study demonstrate important applications of the core-shells including scattering suppression, airborne obscurants made of fractal gold shells, photomodification of the fractal structure providing windows of transparency, and plasmonics core-shell with a gain shell as an active device. Plasmonic resonances of the metallic shells depend on their nanostructure and geometry of the core, which can be optimized for the broadband extinction. Significant extinction from the visible to mid-infrared makes fractal shells very attractive as bandpass filters and aerosolized obscurants. In contrast to the planar fractal films, where the absorption and reflection equally contribute to the extinction, the shells' extinction is caused mainly by the absorption. This work shows that the Mie scattering resonance of a silica core with 780 nm diameter at 560 nm is suppressed by 75% and only partially substituted by the absorption in the shell so that the total transmission is noticeably increased. Effective medium theory supports our experiments and indicates that light goes mostly through the epsilon-near-zero shell with approximately wavelength independent absorption rate. Broadband extinction in fractal shells allows as well for a laser photoburning of holes in the extinction spectra and consequently windows of transparency in a controlled manner. Au fractal nanostructures grown on PCC flakes provide the highest mass normalized extinction, up to 3 m^2/g, which has been demonstrated in the broad spectral range. In the nanoplasmonic field active devices consist of a Au nanoparticle that acts as a cavity and the dye molecules attached to it via thin silica shell as the active medium. Such kind of devices is considered as a nano-laser or nano-amplifier. The fabricated nanolasers were studied for their photoluminescence kinetic properties. It is shown that the cooperative effects due to the coupling of dye molecules via Au nanoparticle plasmons result in bi-exponential emission decay characteristics in accord with theory predictions. These bi-exponential decays involve a fast superradiant decay, which is followed by a slow subradiant decay. To summarize, this work shows new attractive properties of core-shell nanoparticles. Fractal Au shells on silica cores prove to be a good scattering suppressor and a band pass filter in a broadband spectral range. They can also be used as an obscurant when PCC is used as the core material. Finally, gold nanoparticles coated with silica with dye results in bi-exponential decays.
Using a Text Mining Approach to Examine Online Learning Research Trends of the Past 20 Years (1997-2016)
Authors:   , Keahey Heather Lynn
Published: February 2025

The purpose of this research is to identify longitudinal trends relevant to online learning research within 15 highly regarded, peer-reviewed publications in educational technology and online education. Online instruction has become a popular form of education delivery across academic institutions. A review of literature on the topic shows that missing from the corpus is a trend analysis focused in online learning research across multiple journals. Previous efforts of establishing trends in online learning are narrow in focus using only one journal or a shortened time frame. This metatrend analysis employed text mining techniques to examine twenty years (1997-2016) of published research in an effort to establish past, present and emerging trends within published literature. A general bibliometric analysis is offered highlighting prolific and yearly journal publications. Meaningful trending terms used during the twenty-year time period were identified and analyzed. A cluster analysis performed on the extracted data provides a single layer taxonomy regarding online learning research. Time trends within the clusters were identified to offer a more in-depth analysis. Trends revealed during the research indicate a changing relationship of online learning and distance education. A strong emphasis on students and learning was noted as a consistent trend throughout the literature. Emerging categories recognized include openness and mobility, game-based learning, and MOOCs. The intention of the research is to offer an overview of trends in online learning research in order to contribute to the ongoing dialogue concerning the development and delivery of online education.
Service Honest and Faithful: The Thirty-Third Volunteer Infantry Regiment in the Philippine War, 1899-1901
Authors:   , Andersen Jack D.
Published: February 2025

This manuscript is a study of the Thirty-Third Infantry, United States Volunteers, a regiment that was recruited in Texas, the South, and the Midwest and was trained by officers experienced from the Indian Wars and the Spanish-American War. This regiment served as a front-line infantry unit and then as a constabulary force during the Philippine War from 1899 until 1901. While famous in the United States as a highly effective infantry regiment during the Philippine War, the unit's fame and the lessons that it offered American war planners faded in time and were overlooked in favor of conventional fighting. In addition, the experiences of the men of the regiment belie the argument that the Philippine War was a brutal and racist imperial conflict akin to later interventions such as the Vietnam War. An examination of the Thirty-Third Infantry thus provides valuable context into a war not often studied in the United States and serves as a successful example of a counterinsurgency.
The Experience of Language Use for Second Generation, Bilingual, Mexican American, 5th Grade Students
Authors:   , Paz Michael
Published: February 2025

There is a paucity of research regarding language use among bilingual clients, particularly with Latino children. In order to provide culturally sensitive counseling for bilingual, Spanish-speaking, Latino children it is important to understand their experience of language use. The purpose of this study was to investigate how second generation, bilingual, Mexican American, 5th grade students experience language use in the two languages with which they communicate. I employed a phenomenological method to data collection and analysis and conducted semi-structured individual and group interviews with three boys and five girls (N = 8). Analysis of the individual and group interviews yielded four main structures: (a) dominant language determined perception of developing dual selves, (b) speaking two languages useful in language brokering and upward mobility, (c) dominant language determined experience of language use, and (d) language use and aspects of the complementarity principle. Findings from this study suggest that bilingual Latino children experience language brokering for their parents as difficult, speaking two languages as useful regarding upward mobility, and that their dominant language influences various aspects of their daily experiences such as with whom and where they use each language. Limitations to this research include insufficient time building rapport with participants and challenges related to unexplored dimensions of bilingualism in the counseling research literature. An overarching implication for future research, clinical practice, and counselor education is that bilingualism, language use, and the depth of experience of Latino children are largely understudied topics.