Currently, there is no equipment to measure the real-time fit of EHMR or N-95masks which are used in harsh environments. Improper fit of these EHMRs or N-95 masks exposes the personnel to hazardous environments. Surface acoustic wave (SAW) sensors have been around for few decades and are being used in various applications. In this work, real-time PM2.5 detection using passive wireless SAW sensors is presented. The design of meander antenna at 433MHz for wireless interrogation of SAW sensor using HFSS and ADS is also presented in this thesis. This works also includes the design of YZ-lithium niobate SAW sensor including COMSOL simulation.

Metastatic cancer is more dangerous and difficult to treat than pre-metastatic cancer. Ninety percent of cancer-related deaths are caused by metastatic cancer. When cells go through metastases, they go through changes that allow them to break away from the primary tumor and invade secondary tissues. These changes, in lipid membrane composition and cellular glycocalyx, make the cell more resistant to therapeutics. Actin cytoskeleton contractility plays a major role in these changes, as increased contractility has been linked to upregulation of phosphoinositides and production of glycoproteins. Light induced molecular adsorption of proteins (LIMAP) was used to control the actin arrangement and cell shape in order to mimic and study metastatic cells. Negatively charged proteins electrostatically adhere to the surface in order to create patterns for the cells to stick. Neutravidin was conjugated to poly(glutamic acid) to improve attachment to the surface. We observed differences in cell shape and phosphoinositide behavior based on LIMAP patterning. Additionally, expression of key glycoproteins related to cancer metastasis increased with increased actin contractility. The actin cytoskeleton was the main driver of changes to the cell membrane and glycocalyx.

This dissertation examines representations of the Pacific theater in World War II in ethnic American literature, with a focus on its rendition of US and Japanese racism and imperialism in the mid-twentieth century. Reading a range of African, Asian, Jewish, Mexican, and Native American literary writings, I investigate their modifications of the American master narrative that the Second World War was "good" and "necessary," a war fought against fascism and for democracy, justice, and freedom. Instead of such a simplistic and reductive view, ethnic American writers envision the Pacific theater as a race war between whites and persons of color and as a conflict between two imperialist nations, the United States and Japan. Ethnic Americans' racial double consciousness functions to resist an oversimplification of the Pacific theater. In these ethnic writers' work, American characters from diverse backgrounds create friendships with those of Asian nationalities, including Chinese, Filipinos, Koreans, and Japanese. These texts are necessary because ethnic Americans' experiences are underrepresented in the traditional WWII narrative of Western masculinity, originated by Ernest Hemingway and completed by President Truman and Douglas MacArthur. As opposed to the typical white American literary and cinematic treatment of the war as fought in the land of …

In a society fixated on leaders, where does that leave followers? Followership highlights the follower in the leadership process, examines who are followers, and explores how and why people follow. Much of the existing literature on followership has focused on classifying followers into follower types. However, less is known about why an employee might enact a particular follower role. The purpose of this dissertation is to understand how leaders influence the likelihood that followers to enact a particular follower role orientation, either coproducing or passive. Specifically, this research contributes to understanding the impact of transformational leadership on follower motivation and follower role orientation. An additional contribution of this dissertation is to establish the theoretical mechanism that explains the connection between leader behavior and follower role orientation by integrating self-determination theory (SDT) into the process of followership. Through SDT, we gain understanding of the origins of these roles by explaining their underlying motivation. Study 1 consisted of sequential experiments with a between-subject design that used distinct vignettes for transformational leadership and work-based need satisfaction. Findings support the causal relationship between transformational leadership and follower needs satisfaction; however, the casual relationship between follower need satisfaction and follower role orientation was not significant. …

Using metacommunity theory, I investigated the mechanisms of meta-assemblage structure and assembly among medium- to large-bodied mammals in North Texas. Mammals were surveyed with camera-traps in thirty property units of the LBJ National Grasslands (LBJNG). In Chapter II the dispersal and environmental-control based processes in community assembly were quantified within a metacommunity context and the best-fit metacommunity structure identified. A hypothesis-driven modelling approach was used in Chapter III to determine if the patterns of species composition and site use could be explained by island biogeography theory (IBT) or the habitat amount hypothesis (HAH). Islands were defined as the LBJNG property unit or the forest patch bounded by the property unit. Forest cover was selected as the focal habitat for the HAH. Seasonal dynamics were explored in both chapters. Metacommunity structure changed with each season, resulting in quasi-nested and both quasi and idealized Gleasonian and Clementsian structures. Results indicated that the anthropogenic development is, overall, not disadvantageous for this assemblage, that community assembly receives equal contributions from spatial and environmental factors, and that the metacommunity appears to operate under the mass effects paradigm. The patterns of species composition and site use were not explained by either IBT or HAH. Likely because …

This study aimed to explore supervisee and supervisor experiences of relational depth (RD) within the supervisory relationship and its association with supervisee level of counselor self-efficacy (CSE). Participants in the study were master's level counseling students and their doctoral supervisors in a practicum course. A total of 52 supervisees (aged 22-57; 19.2% male, 80.8% female) and 18 supervisors (aged 25-46; 16.7% male, 83.3% female) participated in the study. Results demonstrated that supervisee perception of the relationship explained approximately 15% of the variance in supervisee CSE. Specifically, supervisee perception of supervisory working alliance (SWA; β = .406, rs2=.997, p = .025) was found to be a significant predictor of CSE while supervisee RD was not a significant unique predictor (β = -.033, rs2=.370, p = .850), with most of the variance explained by RD being shared with SWA. Results also demonstrated that the supervisor perception of the relationship did not significantly explain variance in supervisee CSE. From these results, one may tentatively conclude that the supervisory relationship contributes to CSE, and that RD, as it is currently being measured, may not able to account for variance above or beyond that of the SWA. Extended results are described and summarized using text, …

Roughly 1 million Blacks fled from the South to cities in the North, and with this shift New York City saw a 66% increase in its Black population between 1910 and 1920. By the end of the 1920s Harlem had become home to approximately 200,000 Black residents. But during the period 2000 to 2016 three of the nation's top ten gentrifying zip codes could be found in Harlem, and Harlem's Black population decreased by 23,166 residents, while Harlem's white population increased by 33,442 during this era. Similar to Harlem having played a pivotal role in Black culture throughout the United States, the Black church has been a pillar and resource in the Black community. In sustaining its congregants, the Black church has played a critical role in Black liberation. But despite the potential that Black churches may hold, many are experiencing declining attendance and presence. This study aims to examine the racially nuanced dynamics of Harlem's spaces confronting gentrification by looking at the interrelated dynamics of gentrification and the Black church. Data was collected via participant observation and semi-structured interviews in Harlem. The research elucidates findings regarding Harlem's gentrification, the Black church in Harlem, tactics for survival of the Black …

In this work, we have explored 2D semiconducting transition metal dichalcogenides (TMDs), black phosphorus (BP), and graphene for various applications using liquid and mechanical exfoliation routes. The topical areas of interest that motivate our work include considering factors such as device integration, stability, doping, and the effect of gasses to modulate the electronic transport characteristics of the underlying 2D materials. In the first area, we have integrated solution-processed transparent conducting oxides (TCOs), specifically indium-doped tin oxide (ITO) with BP, which is a commonly used TCO for solar cell devices. Here we have found surface treatment of glass substrates with a plasma before spin-coating the solution-processed ITO, to be effective in improving coverage and uniformity of the ITO film by promoting wettability and film adhesion. The maximum transmittance obtained was measured to be ~75% in the visible region, while electrical measurements made on BP/ITO heterostructures showed improved transport characteristics compared to the bare ITO film. Within the integration realm, inkjet-printing of BP and MoS2 p-n hetero-junctions on standard ITO glass substrates in a vertical architecture was also demonstrated. To address the issue of stability which some 2D materials such as BP face, we experimented with ionic liquids (ILs) to passivation the …

This dissertation addresses research questions related to defining user's trust and risk perceptions associated with social networking usage behavior in relation to the repeated privacy and security breaches. The general research question is explored in the dissertation via the conduct of three related studies. The finding from these three investigations are presented in the results section as 3 essays that collectively examine the social networking sites usage behavior. Essay 1 proposes a conceptual model based on the review of multiple breaches. The review provides a conceptual model which is further analyzed using a quantitative survey in the second essay. Essay 2 measures the trust and risk perceptions associated with different sources of information when presented with multiple breaches. This portion of the research used a quantitative method that included surveying of college students from University of North Texas (UNT) to understand the relation between user's trust and risk perceptions. Essay 3 examines the social networking usage behavior on account of repeated privacy and security breaches. This essay uses the insights from the other two essays to identify the usage behavior and how it is affected. The proposed model was tested using a survey questionnaire method. Results show a significant relationship …

Habitual (i.e., average or typical) sleep duration and sleep efficiency vary widely by demographic characteristics, including age, gender, and racial/ethnic identity. Despite a wealth of studies on demographic patterns in habitual sleep, these results are often based on cross-sectional surveys, which ask participants to retrospectively recall their "typical" or "recent" sleep. Yet, sleep is a highly dynamic behavior and may fluctuate substantially from night-to-night. This intraindividual variability (IIV) in sleep/wake patterns can be captured a multitude of ways, most commonly by using formula-based calculations. Although there is growing attention on the importance of IIV in sleep, findings on demographic differences are still inconclusive, and there are no guidelines for typical values of IIV in sleep. The present study quantitatively synthesized 8 international data sets (N = 2847 participants, 29,832 total days of sleep data), focusing on examining age, gender, and racial/ethnic identity differences in IIV in sleep measured via sleep diaries, actigraphy, and electroencephalography. Sleep duration and sleep efficiency varied widely from night-to-night within people (duration: 64-119 minutes; efficiency: 5-8%). Different metrics of IIV were strongly correlated within and across sleep measurement types. Younger adults had more IIV in diary and actigraphy sleep duration. Gender differences in IIV in sleep …

I designed an explanatory sequential mixed-method study to explore the relationship between leadership practices, collective teacher efficacy (CTE), and educational outcomes of low SES students in an open school system. Four data sources were analyzed: K-5 student Developmental Reading Assessment (DRA) results of 1,170 students, Collective Teacher Belief Scale (CTBS) survey to measure CTE perceptions of 48 teachers, focus group interviews composed of a stratified sample of 11 K-5 teachers, and two one-on-one principal interviews. The study took place in two elementary schools in north Texas during the 2020-2021 school year. A Spearman's rank-order correlation analysis indicated that the relationship between CTBS scores and student reading scores was mixed. While one school showed a positive association between CTE and the reading data of low SES students, the other school showed a weak correlation between the variables. The quantitative data indicated that CTBS scores did not independently explain reading achievements at both campuses. The data also showed that while teachers had a large effect size on the reading performance of low SES students, as measured through a Cohen's d for paired sample t-test, achievement gaps continued to widen. Two themes emerged through a grounded theory approach when principals described their sensemaking …

Drawing on in-depth, semistructured interviews with 42 nonbinary-identified individuals in Texas, I examine both the relationship between pronouns and identity and how individuals use pronouns in interaction. Some individuals speak about their pronoun set as a crucial component of their gender identity, adopting what I refer to as an essential expression strategy, while others discuss their pronoun set as more loosely connected to their non-binary identity, adopting what I refer to as a flexible expression strategy. Whether an individual adopts an essential or flexible expression strategy informs pronoun use in a particular context. Specifically, I find that respondents adopting an essential expression strategy are more likely to emotionally invest in using/enforcing a particular pronoun set and report strong emotions from the use of correct or incorrect pronouns in interaction. In contrast, respondents adopting a flexible expression approach are less emotionally invested in a particular pronoun set. As a result, these respondents are more likely to defer pronoun choice to the audience and prioritize the ease of interaction with less emotional consequences.

Dehydroabietinal (DA), an abietane diterpenoid, was previously demonstrated to be a potent activator of systemic acquired resistance (SAR). DA also promotes flowering time in Arabidopsis thaliana by repressing expression of the flowering repressor FLOWERING LOCUS C (FLC) while simultaneously upregulating expression of FLOWERING LOCUS D (FLD), FLOWERING LOCUS VE (FVE) and RELATIVE OF EARLY FLOWERING 6 (REF6), a set of flowering time promoters. To further understand the mechanism underlying signaling by abietane diterpenoids, Arabidopsis mutants exhibiting reduced responsiveness to abietane diterpenoids were identified. One such mutant plant, ems2/7, exhibited SAR-deficiency and delayed flowering, which were found to be associated with two independent, but linked loci. The gene responsible for the SAR defect in ems2/7 was identified as DEFECTIVE IN SYSTEMIC DEFENSE INDUCED BY ABIETANE DITERPENOID 1 (DSA1). Similar to the missense mutant dsa1-1 identified in the mutant screen, the T-DNA insertion bearing null allele dsa1-2 exhibited SAR deficiency that could be complemented by a genomic copy of DSA1. The gene responsible for the delayed flowering phenotype of ems2/7 remains to be identified. DSA1 encodes a protein that is homologous to human protein O-fucosyltransferase 2. DSA1 is required for long-distance transport of the SAR signal. It is hypothesized that DSA1 is …

As technology has advanced, data has become more and more important. The more breakthroughs are achieved, the more data is needed to support them. As a result, more storage is required in the system's memory. Compression is therefore required. Before it can be stored, the data must be compressed. To ensure that information is not lost, efficient compression is necessary. This also makes sure that there is no redundancy in the data that is being kept and stored. Compressive sensing has emerged as a new field of compression thanks to developments in sparse optimization. Rather than relying just on compression and sensing formulations, the theory blends the two. The objective of this thesis is to analyze the concept of compressive sensing and to study several reconstruction algorithms. Additionally, a few of the algorithms were put into practice. This thesis also included a model of the ECG, which is vital in determining the health of the heart. For the most part, the ECG is utilized to diagnose heart illness, and a modified synthetic ECG can be used to mimic some of these arrhythmias.

Mending the Gaps examines the failures and deficits that have occurred in education both historically and today. These gaps that already existed in learning, equality, opportunity, and technology have all been made worse after two years of a global pandemic. Focusing on students in the state of Texas, which has the 2nd largest economy in the United States, but currently ranks 34th in quality of education, now students face the reality of the COVID 19 health crisis in an already overburdened public education system. People in every area of the community, including local, state, and national policy makers, are questioning if it is time to rethink what is considered a quality education. This documentary project will take viewers from the classroom to the boardroom, as stakeholders from all levels of the educational spectrum have an earnest conversation and answer the hard question, can the current system close the gaps and salvage a generation of students?

This thesis consists of two projects in the field of machine learning. Previous research in the OSCAR UNT lab based on KMeans color quantization is further developed and applied to individual color channels and segmented input images to explore compression rates while still maintaining high output image quality. The second project implements a small-scale dual path network for image classifiaction utilizing the CIFAR-10 dataset containing 60,000 32x32 pixel images ranging across ten categories.

The results from this study, on a few commercial and model metastable beta titanium alloys, indicate that the growth restriction factor (GRF) model fails to interpret the grain growth behavior in the additively manufactured alloys. In lieu of this, an approach based on the classical nucleation theory of solidification incorporating the freezing range has been proposed for the first time to rationalize the experimental observations. Beta titanium alloys with a larger solidification range (liquidus minus solidus temperature) exhibited a more equiaxed grain morphology, while those with smaller solidification ranges exhibited columnar grains. Subsequently, the printability of two candidate beta titanium alloys containing eutectoid elements (Fe) that are prone to beta fleck in conventional casting, i.e., Ti-1Al-8V-5Fe (wt%) or Ti-185, and Ti-10V-2Fe-3Al (wt%) or Ti-10-2-3, is further investigated via two different AM processing routes. These alloys are used for high-strength applications in the aerospace industry, such as landing gears and fasteners. The Laser Engineered Net Shaping and Selective Laser Melting (the two AM techniques) results show that locally higher solidification rates in AM can prevent the problem of beta fleck and potentially produce β-titanium alloys with significantly enhanced mechanical properties over conventionally cast/forged counterparts. Further, the detailed investigation of microstructure-mechanical property …

Dieter Schnebel's String Trio from 2007-2009 is a spatial sound composition that features unique visual components within a traditional string trio setting. This research provides performers and audiences a more thorough understanding of the String Trio and its evocative aesthetic qualities, by identifying and organizing the ways in which the visual and musical material interact. To provide context for String Trio, a brief overview of Schnebel's compositional style and influence on avant-garde musical trends of the latter half of the twentieth century is provided in chapter 2. Special consideration is given to his instrumental chamber music and works for string instruments. In chapter 3, the prior musical analysis and aesthetic context provides a basis for the many conceptual implications resulting from the incorporation of theatricality into a typically non-theatrical genre. The performers' roles within the ensemble and the ways in which they relate to one another as well as their audience, are illuminated and ultimately contribute to a deeper, enhanced experience of the piece. Expectations and traditional notions concerning formal, classical music etiquette are also explored through Schnebel's complex directional changes in orientation and unconventional utilization of the performance space.

Loss is an inevitable part of life. The actual process of grieving is unique and can be hard to quantify. Grief interventions can address the relationship quality and attachment status between the griever and the deceased and how memories are interpreted and carried into the present and future. This three-essay dissertation explores variations of loss and the factors that contribute to a resilient recovery.

Relatively few studies have explored the relationship between gender role conflict (GRC) and an individual's religious/spiritual identities. This study sought to add to the research on GRC by exploring the experiences of female and male GRC, and expand the understanding of the influence of religion/spirituality (R/S) variables on GRC. Participants (N = 359) were recruited from social media and undergraduate courses and completed an online survey that assessed GRC, a variety of R/S variables, and life satisfaction. Overall, there were some significant differences found between male and female experiences of GRC. In general, the R/S variables did not have a large impact on GRC. However, religious fundamentalism and extrinsic and quest religious orientations were related to specific subscales of GRC. Maintaining congruency between one's personal values and one's religious institution was related to lower levels of specific subscales of GRC. Additionally, GRC was related to lower levels of life satisfaction. Regarding the subscales of GRC, restrictive emotionality was the strongest predictor of lower life satisfaction. By furthering research on the interplay between GRC and R/S, clinicians will be more equipped to handle the repercussions of stereotypical roles within gender and religion, address negative attitudes and behaviors, and lead discussions about …

Various forms of complementary and alternative medicine (CAM) are increasingly being used in the United States and globally over time. Among CAM, natural products, including herbal medicines, are the most used type. However, the increase in the use of CAM has gone on with minimal or without a corresponding increase in the rate of disclosure of use to the health care providers. The theories of care-seeking behavior and the behavioral model of health services use guided most of the study. Data from the 2012 National Health Interview Survey were analyzed to determine the health factors that affect the nondisclosure of herbal medicine usage by respondents (N = 423) who used herbs as their first choice of CAM therapy. Data were analyzed using descriptive statistics and a binary logistic model. About one quarter of herb users did not disclose their use of herbs to the health care provider. Nondisclosures were likely to be associated with herb users who also used homeopathy and those who used herbs to treat diseases that are usually short-term. The nondisclosure rate of the use of CAM, including herbal therapy, remains a recurring concern. As part of the practical implications, the study creates and supports the awareness …

This work develops a simple and low-cost microphone-based spirometer with a scalable infrastructure that can be used to monitor COPD and Asthma symptoms. The data acquired from the system is archived in the cloud for further procuring and reporting. To develop this system, we utilize an off-the-shelf ESP32 development board, MEMS microphone, oxygen mask, and 3D printable mounting tube to keep the costs low. The system utilizes the MEMS microphone to measure the audio signal of a user's exhalation, calculates diagnostic estimations and uploads the estimations to the cloud to be remotely monitored. Our results show a practical system that can identify COPD and Asthma symptoms and report the data to both the patient and the physician. The system developed can provide a means of gathering respiratory data to better assist doctors and assess patients to provide remote care.

The expansionist agenda of the Polk administration culminated in the War with Mexico. The capture of Mexico City in September 1847 left the United States Army with the unprecedented task of occupying an enemy capital for an extended period. After the initial theaters of operation proved unable to secure a peace, Maj. Gen. Winfield Scott commenced a campaign to take central Mexico including the capital city. In March 1847, an army of 11,000 soldiers under Scott landed at Vera Cruz. In six months, Scott's army marched over 250 miles and won five major battles. In mid-September, Scott took Mexico City. Throughout the campaign, Scott attempted to implement a pacification plan in an effort to prompt Mexico to open peace negotiations. Concern for his army weighed heavily on him as he faced unprecedented challenges in occupying Mexico City after its capture. The United States simply had almost no experience in the ramifications of fighting a foreign war, other than a few brief small-scale incursions onto foreign soil at Tripoli in 1805 and in British Canada. The difficulties that arose for Scott from the situation in Mexico were frustrating. Scott pacification plan used conciliation, coercion, and force on Mexico's army and people …

Cobalt oxynitride films formed by magnetron sputter deposition of a Co target in N2 or NH3 plasma or, alternatively, by NH3 plasma nitridation of a Co film deposited on Si(100), show a divergence of properties arising from (a) N and O interactions for N and O atoms bonded to each other or through a common metal center and (b) the oxophilicity of the metal center itself. Core and valence band X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and plane wave density functional theory (DFT) calculations have been used to probe chemical and electronic interactions of nitrogen-rich cobalt oxynitride CoO1-xNx (x > 0.7) films. DFT-based calculations supervised by the Cundari group show the zinc blende (ZB) structure is found to be energetically favored over the rocksalt (RS) structure for x > ~ 0.2, with an energy minimum observed in the ZB structure for x ~ 0.8 - 0.9. There is also agreement with experiment for core level binding energies obtained for DFT calculations based on the ZB structure and this forms the basis of a predictive model for understanding how N and O interactions impact the electronic and catalytic properties of these materials. Vanadium oxynitride films were deposited in a mixture …