Transition metal oxynitrides are of growing interest for their use as electrocatalyst for nitrogen reduction reaction. The metals in the oxynitride used for catalytic process are stabilized in intermediate state for effective activation of nitrogen. Therefore, studying the interaction of metal oxynitrides films to ambient exposure is necessary. Here, sputter deposited vanadium oxynitride is compared to cobalt oxynitride using insitu Auger electron spectroscopy (AES), ex situ X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). After deposition in Ar/N2 environment, in situ AES spectra indicate that film is vanadium oxynitride despite oxygen is not the reactive gas. In contrast, in situ AES indicate film is pure cobalt nitride at the same base pressure and deposition condition (as vanadium). For ambient exposure, in situ AES indicate the incorporation of oxygen in the cobalt nitride film to form cobalt oxynitride. Ex situ XPS indicate both films get more oxidized but uniformly distributed as there is only slight difference in grazing and normal emission XPS. XRD and SEM also indicate how homogeneously distributed both films are. These finding confirms how important it is that transition metal centers are kept in intermediate oxidation state for the activation of nitrogen bond.

Previous studies have shown that human platelets and megakaryocytes carry microRNAs suggesting their role in platelet function and megakaryocyte development, respectively. However, there is limited information on microRNAs' role in zebrafish thrombopoiesis. Zebrafish thrombocytes could be used as a model to study their role in megakaryocyte maturation and platelet function because thrombocytes have both megakaryocyte features and platelet properties. In our laboratory, I identified 15 microRNAs in thrombocytes using single-cell RNA sequencing. Knockdown of three microRNAs, mir-7148, let-7b, and mir-223, by the piggyback method in zebrafish led to an increase in the percentage of thrombocytes. Functional thrombocyte analysis using plate tilt assay showed no modulatory effect of the three microRNAs on thrombocyte aggregation/agglutination. I then verified these findings in zebrafish larvae after the knockdown of the above microRNAs followed by an arterial laser thrombosis assay. I concluded mir-7148, let-7b, and mir-223 are repressors for thrombocyte production. Furthermore, I explored let-7b downstream genes in thrombocytes detected by RNA-seq analysis and chose 14 targets based on their role in cell differentiation (rorca, tgif1, rfx1a, deaf1, zbtb18, mafba, cebpa, spi1a, spi1b, fhl3b, ikzf1, irf5, irf8, and lbx1b) that are transcriptional regulators. The qRT-PCR analysis of expression levels the above genes following let-7b knockdown …

Previous work was successful at delineating reaction pathways for the photoactivated synthesis of an amine, [CztBu(PyriPr)(NH2−PyriPr)], by double intramolecular C−H activation and functionalization via irradiating a metal(II) azido complex, [CztBu(PyriPr)2NiN3. The present work seeks to expand upon earlier research, and to substitute the metal with iron or cobalt, and to expand the study to photocatalyzed intermolecular C−H activation and functionalization of organic substrates. Density functional theory (DFT) – B3LYP/6-31+G(d') and APFD/Def2TZVP – and time-dependent density functional theory (TDDFT) were used to propose a detailed pathway comprised of intermediates of low, intermediate, or high spin multiplicity and photo-generated excited states for the reaction of the azido complex, [CztBu(PyriPr)2MN3] to form the amine complex [CztBu(PyriPr)M(NH2−PyriPr)], M = Co, Ni or Fe, and the intermediates along the reaction pathway. For applications on quantum computing, the photophysical properties of photoactive d8 nickel(II) complexes are modeled. Such systems take advantage of a two-level system pathway between ground to excited state electronic transitions and could be useful for the discovery of successful candidates for a room temperature qubit, the analogue of a classical computational bit. A modified organometallic model, inspired by a nitrogen vacancy selective intersystem crossing model in diamond, was developed to take advantage of …

Hateful content and offensive language are commonplace on social media platforms. Many surveys prove that high percentages of social media users experience online harassment. Previous efforts have been made to detect and remove online hate content automatically. However, removing users' content restricts free speech. A complementary strategy to address hateful content that does not interfere with free speech is to counter the hate with new content to divert the discourse away from the hate. In this dissertation, we complement the lack of previous work on counterhate arguments by analyzing and detecting them. Firstly, we study the relationships between hateful tweets and replies. Specifically, we analyze their fine-grained relationships by indicating whether the reply counters the hate, provides a justification, attacks the author of the tweet, or adds additional hate. The most obvious finding is that most replies generally agree with the hateful tweets; only 20% of them counter the hate. Secondly, we focus on the hate directed toward individuals and detect authentic counterhate arguments from online articles. We propose a methodology that assures the authenticity of the argument and its specificity to the individual of interest. We show that finding arguments in online articles is an efficient alternative compared to …

This study aims to investigate college students' security awareness of using social media in sharing information. The two theories that have guided this study are the theory of planned behavior (TPB) and the technology acceptance model (TAM). Data was collected from both undergraduate and graduate students from the University of North Texas (UNT) in Denton. The total responses included 380 students from different majors with 291 valid responses for data analysis; The structural equation model (SEM) Lavaan package was used to find out the best fit of the model. A diagonally weighted least squares (DWLS) was used to model the variables as ordinal in this study's analysis as ordinal data made the model fit substantially. The study found that 6 factors: attitude (AB), subjective norm (SN), perceived behavior control (PBC), perceived usefulness (PU), perceived risks (PR), and security awareness (SA) influenced behavior intention (BI). Also, I found that AB was influenced by PR and SA, as well as SN influenced by SA. Self-efficacy (SE) influenced PBC. On the other hand, the study found that controllability (C) did not influence PBC; perhaps, an individual's skills do not interact with social media security settings. Perceived ease of use (PEOU) did not influence …

The goal of this thesis is to support the automated identification of accessibility in user reviews or bug reports, to help technology professionals prioritize their handling, and, thus, to create more inclusive apps. Particularly, we propose a model that takes as input accessibility user reviews or bug reports and learns their keyword-based features to make a classification decision, for a given review, on whether it is about accessibility or not. Our empirically driven study follows a mixture of qualitative and quantitative methods. We introduced models that can accurately identify accessibility reviews and bug reports and automate detecting them. Our models can automatically classify app reviews and bug reports as accessibility-related or not so developers can easily detect accessibility issues with their products and improve them to more accessible and inclusive apps utilizing the users' input. Our goal is to create a sustainable change by including a model in the developer's software maintenance pipeline and raising awareness of existing errors that hinder the accessibility of mobile apps, which is a pressing need. In light of our findings from the Blackboard case study, Blackboard and the course material are not easily accessible to deaf students and hard of hearing. Thus, deaf students …

In this dissertation, I report the results of my research on twisted moiré photonic crystals which can be formed through multi-beam holographic interference without a physical rotation and later fabricated by electron-beam lithography. Their optical properties, such as photonic bandgaps, multiple resonance modes, and quality factor are presented. Randomized moire photonic crystals in lattice are also studied. The applications of moire photonic crystals in improving light extraction efficiency are simulated and verified in light emitting devices. Furthermore, I simulated the light extraction efficiency in OLED when the Al layer is patterned with a triangular GPSC, square moiré PhC with defects in the uniform area, and random locations of the photonic lattice, and obtain light extraction efficiency of 78.9%, 79.9%, 81.7%, respectively. Also, the ratios of photoluminescence intensity of LED integrated with twisted moiré PhCs and random moiré PhCs over that without moiré PhCs are measured to be (1.3-1.9) and 1.74, respectively, in a good agreement with simulated ratios of 1.69 and 1.8.

When it comes to hospice care, patients and their families residing in rural counties need competent rural community-based hospice social workers on their team. The study of information seeking behaviors of rural community-based hospice social workers during the global COVID-19 pandemic is significant as there is a need to fill gaps regarding how this specific medical discipline performs their job responsibilities when duties become more complicated due to evolving infection control protocols, decreased direct access to patients, and poor internet services. Community-based rural hospice social workers rely on up-to-date information and resources when providing support services to patients and their families. This has become particularly important during the global pandemic COVID-19. Utilizing Chatman's small world theory, this research lends itself to community-based hospice social workers identifying solutions to the challenges of finding timely and accurate COVID-19 information and resources for hospice patients and their families. Purposive sampling, semi-structured interviews, and qualitative social network analysis (SNA) with ATLAS.ti comprise the methodology for this research. The purpose of this study is to investigate the information seeking behaviors of community-based hospice rural social workers in order to understand how they select their COVID-19 information resources.

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.

Little is known about the current state of multicultural training within sport psychology master's programs. The study explored students' perceptions of their multicultural training and program climate. Importantly, differences in perceptions were investigated based on students' demographic factors, given that students with marginalized identities tend to report less favorable perceptions of and experiences in graduate training. Participants (N = 107) consisted of students and recent graduates of master's level sport psychology programs. Participants reported moderate levels of feeling safe, valued, and comfortable within their master's program, low to moderate levels of multicultural training integration within their curriculum and supervision, and low to moderate satisfaction with their multicultural training. Asian, Asian American, bi/multiracial, Black, African American, Hispanic, and Latino/a/e students, compared to their White peers, reported less satisfaction with their multicultural training, felt less safe, comfortable, and valued within their programs, and perceived less integration of multiculturalism into curriculum and supervision. A multiple regression analysis revealed that, for all students, perceptions of multicultural training integration and reports of feeling safe, comfortable, and valued was significantly related to students' satisfaction with their multicultural training. Discussion focuses on possible explanations for these findings, training implications, and future research directions.

Previous research has tested the lasso method for DIF detection in dichotomous items, but limited research is available on this technique for polytomous items. This simulation study compares the lasso method to hybrid ordinal logistic regression to test performance in terms of TP and FP rates when considering sample size, test length, number of response categories, group balance, DIF proportion, and DIF magnitude. Results showed better Type I error control with the lasso, with smaller sample sizes, unbalanced groups, and weak DIF. The lasso also exhibited more stable Type I error control when DIF was weak, and groups were unbalanced. Lastly, low DIF proportion contributed to better Type I error control and higher TP rates with both methods.

The purpose of this study, through an analysis of the literature review of general scholars in the field of school poverty, equity, efficiency, and student achievement results, was to determine whether economic disparity had a direct statistical significance to student achievement gaps. Specifically, identification of the five socioeconomic tiers using the economic blocks, as defined by the Texas Education Agency, and their corresponding STAAR student achievement results were examined in a border city urban school setting were used to determine if educational achievement disparity existed and whether there was a statistical significance in performance to the identified socioeconomic tiers. Through an analysis of student achievement data of an urban school district, the study established null hypothesis and examined the difference in student achievement between the subsequent five economic tiers, as defined by the Texas Education Agency. Specifically, the study examined if there were differences in student achievement outcomes from each of the five socioeconomic tiers and the statistical significance between the socioeconomic tiers. Furthermore, a deeper analysis was sought to determine the most significant impact in learning loss was determined between economic tiers. The analysis sought to validate the State Compensatory Education funding model in a single district as established …

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.

As stay-at-home mandates were put in place to curtail the spread of COVID-19, the extent to which today's youth has been affected by such efforts has gone largely under examined. Through a collaborative qualitative study with Big Thought, a Dallas-based nonprofit geared towards empowering youth, we sought to answer how the social interactions and socioemotional wellbeing of their 2021 summer program participants were impacted, as well as how Big Thought was able to exhibit organizational resilience. Methods used for this study included digital and in-person ethnography, interviewing, and interactive media projects. Findings showcased noticeable adverse effects to the socioemotional wellbeing of youth (particularly among older cohorts), shifts in communication, gaps in learned practices of socialization, and coping through digital device use. Despite Big Thought's ability to display organization resilience, there is a clear need for additional concerted efforts to be practiced in reacclimating and guiding youth back into social environments and providing them with the resources and support to get there.

Grammy Award–winning pianist, bandleader, and composer Cedar Walton (1934–2013) is a major figure in jazz, associated with a variety of styles from bebop to funk and famous for composing several standards. Born and raised in Dallas, Walton studied music in Denver, where he jammed with musicians such as Charlie Parker and John Coltrane. In 1955, Walton moved to New York, immediately gaining recognition from notable musicians and nightclub proprietors. When Walton returned to the U.S. after serving abroad in the Army, he joined Benny Golson and Art Farmer’s Jazztet. Later, he became both pianist and arranger for Art Blakey’s Jazz Messengers. Next, he worked as part of Prestige Records’s house rhythm section, recording with numerous greats and releasing his own albums. One hallmark of Walton’s impact is his numerous long-term collaborations with giants such as trombonist Curtis Fuller and drummer Billy Higgins. By the end of his career, Walton’s discography, as both band member and bandleader, included many dozens of vaunted recordings with some of the most notable jazz musicians of the 1960s through the first decade of the twenty-first century. Ben Markley conducted more than seventy-five interviews with friends and family members, musicians who played with or were otherwise …

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.

Previous researchers of Jewish history in the Roman Empire have imperfectly employed Greco-Roman sources to describe Roman perceptions of Jews and Judaism by relying on a handful of Greek and Latin written and visual components without attempting to quantify or comprehensively explore this abundant material. Utilizing both quantitative and qualitative methodologies, this dissertation analyzes the vast array of Greco-Roman written and visual sources about Jews and Judaism from the first century BCE to the end of the third century CE. While qualitative reviews of Greek and Latin texts help eliminate potential inconsistencies in the data, computational tools like text-mining analysis quantify the information into calculable results. The addition of visual source material into the framework helps further refine the quantified textual material. Reviews of this data reveal the general traits imperial leaders within the Roman Empire knew about the geography and history of Judaea, Jewish religious beliefs and cultural practices, and Jewish communities in general. Further reviews of the data note regional and, more importantly, temporal variations connecting them to changes both in imperial rule and Judaism. This process presents a more detailed and coherent conception of Roman knowledge of Jews and Judaism than scholars have previously recognized. In addition …

In his Southern Harmony collection, William Duckworth extracts existing material from shape-note hymns found in William Walker's 1835 publication A Southern Harmony and Musical Companion. He then applies minimalist and postminimalist processes to this material to create innovation choral compositions. This document provides a comprehensive analysis of the methods used to construct all twenty works in Duckworth's collection by tracing the extracted source material through the fabric of the new compositions. This study provides substantial evidence of Duckworth's place as a pioneer of the postminimalist genre. It also provides a discussion on the vocal implications of utilizing shape-note hymns as source material as traditional performances of the genre are typically associated with a unique vocal style.

In this study, I examine how an online cryptocurrency community discusses the issue of climate change. In particular, I examine distinctive themes present within discussions that occur on the r/CryptoCurrency forum hosted by reddit.com. Existing research has demonstrated that there are significant carbon emissions linked to cryptocurrency. However, cryptocurrency primarily exists as a peer-to-peer system, meaning that the individual perceptions of cryptocurrency adopters may provide insight into how to address the emissions problem. Using latent Dirichlet allocation and publicly available textual data from Reddit, I find that Reddit's cryptocurrency community engages in robust discussions pertaining to the energy needed to power cryptocurrency systems, most of which is generated from fossil fuels. Therefore, the discussions identified in this study suggest that the social aspect of cryptocurrency may be important when examining the links between cryptocurrency and climate change since they help identify what subjects related to climate change are important for this community.

The problem identified for this study was that principals of elementary schools often do not have the appropriate preparedness and readiness required for meeting the needs of children and teachers in the primary grades. The purpose of this study was to examine the perception of early childhood campus leaders regarding how well-prepared they are to supervise a high-needs campus that consists of primary grades which include prekindergarten through third grade. Qualitative methodology of case study design with a phenomenological perspective was selected. A finding of this research study was principals' preparedness for supervising early childhood grade levels was because their prior work experience in early childhood. Also, supports for the principals are needed to impact how they supervise early childhood grades, but careful consideration of which supports are needed must be made. The final finding was principal actions when supervising early childhood classrooms are based on their opinion about quality rather than the district defined quality document. Recommendation for further research are to replicate this with a larger population and sample; conduct a quantitative study of the impact of early childhood leadership on student outcomes that would follow a cohort of students through elementary school; and conduct a qualitative case …

Indigenous communities around the world are losing their languages at accelerating rates to the effects of the climate crisis and global capitalism. To preserve samples of these languages facing endangerment and extinction, samples of language use (e.g., audio-video recordings, photographs, textual transcriptions, translations, and analyses) are created and stored in language archives: repositories intended to provide long-term preservation of and access to language materials. In recent years, archives of all kinds are considering their origins and audiences. With the emergence of the community paradigm of archiving framework, the roles of archivists, communities, and institutions are under re-examination. Language archives too are reflecting this trend, as it becomes more common for speakers of Indigenous languages (also known as language communities) to document and archive their own languages and histories. As the landscape of language archiving expands, we now see increased emphasis on the re-use of archival material, particularly to support language revitalization—efforts to increase and maintain the use of the language. There are calls for language documentation (and, by extension, language archiving) to prioritize revitalization efforts. This dissertation is a case study of one language archive collection: the Boro Language Resource in the Computational Resource for South Asian Languages (CoRSAL) archive. …

The purpose of this quantitative study was to further explore pedagogical balance using multidimensional scaling and epistemic network analysis. Teacher shortages and attrition remain a critical issue for the future, and simulated classroom environments like simSchool can provide teachers additional training to help improve teaching confidence and teaching experience. Two different data sets were analyzed at various time before and after simSchool use to see how pre-service teachers rate themselves in 8 areas of teaching as defined by the Survey of Teaching Skills. Multidimensional scaling was utilized to see how teaching confidence and teaching experience align with no simSchool use, 90 minutes of use, and 8 hours of use. Epistemic network analysis was utilized to look at the cognitive structures of different groups to determine any differences. The findings are discussed with future research directions provided.

This work focused on laser powder bed fusion (LPBF) of H13 tool steel to examine microstructure and melt pool morphology. Experiments were conducted with varying laser power (P) in the range of 90-180 W and scan speed (v) in the range of 500-1000 mm/s. layer thickness (l) and hatch spacing (h) were kept constant. Volumetric energy density (γ) was calculated using the above process parameters. In order to find a relation between the recorded density and top surface roughness with changing process parameters, set of equations were derived using the non-dimensional analysis. For any chosen values of laser power, scan speed, hatch spacing and layer thickness, these equations help to predict top surface roughness and density of LPBF processed H13 tool steel. To confirm the universal relation for these equations, data of In718 and SS316L processed in LPBF was input which gave a R-square of >94% for top surface roughness and >99% for density. A closed box approach, response surface model, was also used to predict the density and surface roughness which allows only in the parametric range. Material microstructures were examined to identify the melting modes such as keyhole, transition and conduction modes. X-ray diffraction data revealed that there …

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 …