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Additive Friction Stir Deposition of Al-Ce Alloys for Improved Strength and Ductility
Additive friction stir deposition (AFSD) is a solid-state additive manufacturing (AM) technique that breaks down large constituent particles into more refined and uniformly disturbed microstructure. AFSD was used to print Al-Ce alloys. Current commercial Al-alloys upon elevated temperatures go through dissolution and coarsening of strengthening precipitates causing mechanical degradation of these alloys. Al-Ce alloys do not have this issue as cerium's low solubility restricts dissolution into the aluminum matrix at elevated temperatures, thus giving great thermal stability to the microstructure. Al-Ce alloys lack solid solubility that affects the solid solution strengthening and precipitation strengthening. Al-Ce alloys have limitation at room temperature as they can only reach a maximum of ~65 MPa yield strength. Elements like magnesium have been added to alloy to enable solid solution strengthening, and scandium to enable precipitation strengthening to improve strength before going through the AFSD process. By adding new elements to the Al-Ce alloys, an increase in the yield strength from ~60 MPa to ~200 MPa was achieved before AFSD. The casted alloys form coarse particles that reach 300 µm in size; resulting in stress concentration that causes material fracture before necking, giving >10% ductility. AFSD breaks down these coarse particles to increase strength and …
Date:
December 2023
Creator:
Davis, Devin Fredric
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Additive friction stir deposition of AZ31B magnesium alloy
Article explores additive friction stir deposition of AZ31B magnesium alloy with the aid of MELD® technology.
Date:
May 3, 2022
Creator:
Joshi, Sameehan; Patil, Shreyash M.; Mazumder, Sangram; Sharma, Shashank; Riley, Daniel A.; Dowden, Shelden et al.
Object Type:
Article
System:
The UNT Digital Library
Additive Manufacturing of AZ31B Magnesium Alloy via Friction Stir Deposition
Additive friction stir deposition (AFSD) of AZ31B magnesium alloy was conducted to examine evolution of grain structure, phases, and crystallographic texture. AFSD was carried out using a hollow tool made from tool steel at a constant rotational velocity of 400 rpm on the AZ31B base plate. Bar stock of AZ31B was utilized as a feed material. The linear velocity of the tool was varied in the range of 4.2-6.3 mm/s. The feed rate of the material had to be maintained at a half value compared to the corresponding linear velocity for the successful deposition. The layer thickness and length of the deposits were kept constant at 1 mm and 50 mm respectively. The tool torque and actuator force values were recorded during the process and for calculation of the average input energy for each processing condition. Temperature during the AFSD experiments was monitored using a type k thermocouple located 4 mm beneath the deposition surface at the center of the deposition track. The average input energy values showed a decreasing trend with increasing tool linear velocity. The temperature values during deposition were ∼0.7 times the liquidus of the alloy. The deposited material then was examined by laser microscope and profilometer, …
Date:
December 2021
Creator:
Patil, Shreyash Manojkumar
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Addressing Disproportionality in Special Education Through a Social Justice Framework
Presentation discussing the disproportionality in special education programs, which is the over or under representation of a specific group or population identified with a disability or placed in special education in comparison to the actual number of students, and it provides some actionable solutions. It was presented at the 11th annual Jalisco-Texas Conference which was held virtually on March 30-31, 2023.
Date:
March 30, 2023
Creator:
Barrio, Brenda L.
Object Type:
Presentation
System:
The UNT Digital Library
Addressing the Adverse Impacts of JavaScript on Web Archives
Presentation for the IIPC General Assembly and Web Archiving Conference held on May 10-12, 2023 in Hilversum, Netherlands. This presentation identifies the problems associated with JavaScript being increasingly used on web archive pages, and provides solutions for these problems.
Date:
May 12, 2023
Creator:
Goel, Ayush; Zhu, Jingyuan; Netravali, Ravi & Madhyastha, Harsha V.
Object Type:
Presentation
System:
The UNT Digital Library
Adjustment for Local Ancestry in Genetic Association Analysis of Admixed Populations
Presentation on the consideration of local ancestry of admixed populations, or populations comprised of genetically distinct ancestral populations which can alter their gene flow in unique ways. It was presented at the UNT Transdisciplinary Conference on Ancestral Genomics Research which was held virtually on November 20-21, 2020.
Date:
November 21, 2020
Creator:
Wang, Xuexia
Object Type:
Video
System:
The UNT Digital Library
Adjustments in Business Operations during the COVID-19 Pandemic: An Analysis of Natural and Cultural Resource Sites in Texas
This research expands the theoretical concept of human adjustment to floods established by Gilbert F. White and incorporates his adjustment concept to examine the range of adjustments in business operations adopted by Texas' natural and/or cultural resources sites during the first year of the COVID-19 pandemic. This mixed-methods study consisted of an online survey with a follow-up semi-structured phone interview. The survey data was analyzed using descriptive statistics and the interview data was inductively coded for thematic analysis as well as quantitative and qualitative content analyses. Specifically, this study identifies the adjustment measures undertaken by these entities to maintain business operations while reducing the virus spread; analyses the direct and indirect factors influencing adjustment measures; examines new business opportunities that emerged from these adjustments; and evaluates whether the impact of COVID-19 on these entities varied in terms of entity characteristics. Findings indicate that cultural and/or natural resource sites implemented adjustments to maintain their fiscal stability and/or to protect human health; these serve as direct underlying motivating factors for these entities. To support these direct measures, indirect factors influenced the operations thus required adjustments such as staffing, volunteers, technology, funding, and donations. Additionally, new opportunities in business practices emerged while implementing …
Date:
August 2022
Creator:
Tamima, Salvesila
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Administration of Unemployment Relief by the State of Texas during the Great Depression, 1929-1941
During the Great Depression, for the first time in its history, the federal government provided relief to the unemployed and destitute through myriad New Deal agencies. This dissertation examines how "general relief" (direct or "make-work") from federal programs—primarily the Emergency Relief and Construction Act (ERCA) and Federal Emergency Relief Administration (FERA)—was acquired and administered by the government of Texas through state administrative agencies. These agencies included the Chambers of Commerce (1932-1933), Unofficial Texas Relief Commission (1933), Texas Rehabilitation and Relief Commission (1933), Official Texas Relief Commission (1933-1934), Texas Relief Commission Division of the State Board of Control (1934), and the Department of Public Welfare (1939). Overall, the effective administration of general relief in the Lone Star State was undermined by a political ideology that persisted from, and was embodied by, the "Redeemer" Constitution of 1876.
Date:
May 2020
Creator:
Park, David B.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Administrative Law Handbook 2020
This is the implementation of Administrative Procedure Act, the Texas public Information act, and the Texas open meetings act by the Generals Attorney's office . The report describes adjudication, judicial enforcement remedies, rulemaking, attorney general role, the Texas open meeting act, the Texas public Information act.
Date:
2020
Creator:
Texas. Attorney-General's Office. Administrative Law Division.
Object Type:
Report
System:
The Portal to Texas History
[Administrators and custodial staff preparing student packets at San Elizario High School]
Photograph of administrators and custodial staff at San Elizario High School preparing packets for students to pick up. Each staff member is wearing protective gloves.
Date:
March 19, 2020
Creator:
Rojas, Julietta
Object Type:
Photograph
System:
The UNT Digital Library
[Administrators and custodial staff preparing student packets at San Elizario High School]
Photograph of administrators and custodial staff at San Elizario High School preparing packets for students to pick up. Each staff member is wearing protective gloves.
Date:
March 19, 2020
Creator:
Rojas, Julietta
Object Type:
Photograph
System:
The UNT Digital Library
Adolescent Self-Theories of Singing Ability within the Choral Hierarchy
The purpose of this study was to explore adolescent self-views of singing ability through both implicit theories and self-concept meaning systems. A secondary purpose of this study was to examine these self-views specifically in the context of a choral hierarchy. Using a researcher-designed survey instrument, I gathered data from middle- and high-school students currently enrolled in a choir program organized in a hierarchical structure. I analyzed descriptive statistics of survey responses to items designed to measure implicit theories of singing ability, singing self-concept, and goal orientation. I also examined differences among participants by ensemble placement in implicit theory and self-concept scores, correlation between implicit theory and self-concept, and whether implicit theory, self-concept, goal orientation, or current enrollment could predict future enrollment decisions. In addition to these quantitative measures, I coded open-ended responses to two failure scenarios and examined participant responses by ensemble and gender. Both implicit theory and self-concept scores were higher for participants at the top of the choral hierarchy than at the bottom. Open-ended responses, however, did not align with the implicit theory scale and a number of students presented a false growth mindset. Open-ended responses also indicated that failure scenarios were likely to result in an altered …
Date:
May 2020
Creator:
Adams, Kari
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adolescents’ Physical Activity and Depressive Symptoms: A Psychosocial Mechanism
Article tests a hypothesized path model of Theory of Planned Behavior (TPB) variables (i.e., attitude toward behavior, subjective norm, perceived behavioral control, and intention) with physical activity (PA) and depressive symptoms. The findings support the theoretical tenets of TPB and provide empirical evidence of the psychosocial mechanism of PA and depressive symptoms in Chinese adolescents. It suggests that building PA intervention strategies while considering the TPB framework may promote adolescents’ physical and mental health.
Date:
December 31, 2021
Creator:
Shen, Liang; Gu, Xiangli; Zhang, Tao & Lee, Joonyoung
Object Type:
Article
System:
The UNT Digital Library
Adoption of Credit-Hour Reductions in Master of Divinity Programs at the Association of Theological Schools Member Institutions: An Event History Analysis
Seminaries in the United States have for more than two centuries sought to equip ministerial leaders for service within the community of faith. And yet these institutions have traditionally been the focus of very little quantitative research. This lack of data is particularly noteworthy given the existential crises many seminaries currently face, especially regarding their flagship Master of Divinity (MDiv) programs. Among seminary leadership, a common response to declining MDiv enrollment has been to decrease the length of the program, which historically required at least 90 credit hours. The purpose of this quantitative study was to explore change at the Association of Theological Schools member institutions (AMIs) between 2000–2019 through the lens of these credit-hour reductions. Longitudinal data from 113 AMIs were analyzed to examine the relationship between a variety of financial, enrollment, and institutional characteristics and the likelihood that an AMI would reduce its required MDiv credit hours. Results from an event history analysis revealed that, all else being equal, experiencing an increase in total revenues reduced an AMI's likelihood of making a reduction, while being a middle-age institution (founded 1870–1959) and having a higher percentage of peer institutions that made a change increased the likelihood of making a …
Date:
December 2021
Creator:
McKanna, Nathan Jay
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adoption of Innovation in a Community College Environment: User Perceptions of Virtual Reality (VR) Technology among Students Studying Emergency Medical Service (EMS)
This research study examined the implementation of an extended reality (XR) lab on a community college campus to facilitate student and faculty access to immersive learning resources. The study, conducted during one skills day, involved 46 students and was designed to understand if integrating immersive VR into emergency medical technician (EMT) education could enhance learner confidence and motivation, develop problem-solving and analytical thinking skills, and thus connecting the classroom learning with real-world application. The majority of participants reported increased motivation and engagement, alongside improvements in learning outcomes like knowledge retention and skill development. Applying the unified theory of acceptance and use of technology (UTAUT) model revealed performance expectancy, effort expectancy, social influence, and facilitating conditions as key determinants of VR adoption in EMT education. While no significant overall performance enhancement was observed, VR training showed potential to boost motivation, confidence, and specific performance aspects. Furthermore, student perceptions towards VR in EMT education were largely positive, thereby suggesting its utility in immersive scenario training, skill acquisition in a risk-free environment, enhancing learner engagement, and real-world situational preparedness. VR demonstrated promise as a transformative tool in EMT education, necessitating further research to fully exploit its potential in diverse learning environments.
Date:
July 2023
Creator:
Das, Anila
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adoption of Wearable Devices by Older Adults
This dissertation is organized in a traditional format while including three essays that address specific research questions. Essay 1 examined the relationship between physical activity and community engagement and their effect on mental well-being among older men and women. Data from National Health and Aging Trends Study (NHATS) from 2018 to 2020 were explored and the posited relationships were tested. This essay provides empirical support that older adults who are reasonably active and involved in the community have greater mental well-being than those who isolate themselves. Essay 2 provides insight into older adults' motivation to improve their physical activity through the use of a fitness tracker. The key finding from this study is that wearables, especially fitness trackers, can significantly facilitate increased physical activity. Essay 3 is a mixed-methods study to understand older adults' perception of the usefulness of fitness trackers and interaction with such devices. Findings suggest that to increase the adoption of fitness trackers among older adults, makers could improve the esthetics and quality of the wristband in addition to the battery life of the tracker.
Date:
May 2022
Creator:
Enamela, Pranathy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
[Adriance Rhoades petting a dog on the Library Mall]
Photograph of UNT Special Collections employee Adriance Rhoades petting a dog on the Library Mall. The dog is the mascot for Sprockets Bicycle Shop who had a bicycle repair station on the Mall for UnionFest. Another bicycle repair station and a temporary stage in front of the Hurley Administration Building are visible in the background.
Date:
March 5, 2020
Creator:
Esparza, Anna
Object Type:
Photograph
System:
The UNT Digital Library
Adult Attachment Anxiety and Relationship Satisfaction: The Role of Dedication and Constraint Commitment
Adult attachment has been found to play an important role for romantic relationship satisfaction. Specifically, the existent literature generally suggests that attachment anxiety is negatively related to relationship satisfaction. However, the underlying mechanism for this link still needs further exploration. The present study examined the direct and indirect effect of attachment anxiety on relationship satisfaction via two distinct relationship commitment variables: constraint commitment and dedication commitment. The final sample included 146 unmarried participants who were in a romantic relationship for at least three months. Results of multiple regression analyses on the indirect effect model indicated that attachment anxiety had a significant direct effect on relationship satisfaction as well as a significant indirect effect on relationship satisfaction via constraint commitment. However, the hypothesized indirect effect through dedication commitment was not supported. Findings are discussed from the adult attachment perspective. Counseling implications, limitations, and future research directions are outlined.
Date:
May 2021
Creator:
Chao, Wan Ju
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adult Attachment, Perceived Social Support, and Problematic Video Gaming Behavior
With the growing popularity in video games, there has been increased concerns over the prolonged exposure to the entertainment medium. Problematic gaming is defined as a pattern of gaming behavior that causes significant impairment in personal, social, other important areas of functioning, often characterized by preoccupation and loss of interest in other areas. This study examined how problematic gaming behaviors may be influenced by insecure adult attachment and perceived social support from differing sources. It was hypothesized that avoidant attachment would have a significant direct and indirect effect (via perceived social support) on problematic gaming. In addition, perceived social support from online friends and from offline friends were hypothesized to moderate the relationship between attachment and problematic gaming, Participants were recruited from both SONA (n = 151) and Amazon's Mturk (n = 264) to complete an online research questionnaire that measured variables of interest. Results indicated that the direct and indirect effects of attachment avoidance on problematic gaming were supported in both subsamples but the moderator effects were not. Further exploratory analysis found that anxious attachment demonstrated a similar pattern as avoidant attachment, but with a significant moderator effect of perceived social support from online friends (enhance) on the attachment …
Date:
December 2020
Creator:
Gu, Peter
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adult Attachment, Racial-Ethnic Identity, Racial-Ethnic Socialization, and Subjective Wellbeing
The current study aimed to explore the direct effect of insecure adult attachment on subjective wellbeing and its indirect effect via racial-ethnic identity. Additionally, the present study examined the extent to which racial-ethnic socialization practices may moderate adult attachment and racial-ethnic identity link. The final sample included 213 emerging adults (M = 20.94; SD = 2.96) with diverse racial-ethnic backgrounds. PROCESS Model 4 and 1 were used to examine the direct and indirect effect of insecure attachment on subjective wellbeing via racial-ethnic identity variables and the interaction effect between insecure attachment and racial-ethnic socialization on racial-ethnic identity variables. Results indicated the direct effect of insecure attachment on subjective wellbeing but did not support hypotheses for the indirect effect of insecure attachment on subjective wellbeing via the racial-ethnic identity variables. Additionally, results indicated that overt socialization buffered the negative impact of attachment avoidance on racial-ethnic identity exploration. Furthermore, racial-ethnic identity variables and subjective wellbeing significantly differed across racial-ethnic groups and socioeconomic statuses. Findings provide insight on the distinct concepts of attachment and racial-ethnic identity as they highlight inter- and intra-personal components, respectively. Mental health professionals may utilize overt socialization to help clients develop a sense of purpose and meaning related to …
Date:
July 2023
Creator:
Toyama, Shiho
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Advanced Air Mobility Operation and Infrastructure for Sustainable Connected eVTOL Vehicle
Article discusses how advanced air mobility (AAM) is an emerging sector in aviation aiming to offer secure, efficient, and eco-friendly transportation utilizing electric vertical takeoff and landing (eVTOL) aircraft. This paper introduces a novel concept addressing future flight challenges and proposes a framework for integrating operations, infrastructure, connectivity, and ecosystems in future air mobility.
Date:
May 16, 2023
Creator:
Al-Rubaye, Saba; Tsourdos, Antonios & Namuduri, Kamesh
Object Type:
Article
System:
The UNT Digital Library
Advanced Cathodes for High Energy Density Lithium Sulfur Battery
A systematic development of 2D alloy catalyst with synergistic performance of high lithium polysulfide (LiPS) binding energy and efficient Li+ ion/electron conduction is presented. The first section of work found that Li+ ions can flow through the percolated ion transport pathway in polycrystalline MoS2, while Na+ and K+ ions can easily flow through the percolated 1D ion channel near the grain boundaries. An unusually high ionic conductivity of extrinsic Li+, Na+, and K+ ions in 2D MoS2 film exceeding 1 S/cm was measured that is more than two orders of magnitude higher than those of conventional solid ionic materials, including 2D ionic materials. The second section of this dissertation focus on catalyzing the transformation of LiPSs to prevent the shuttle effect during the battery cycling by synthesizing 2H (semiconducting) – 1T (metallic) mixed phase 2D Mo0.5W0.5S2 alloy on CNF paper, using two step sputtering and sulfurization method. The lithium sulfur (Li-S) battery cell assembled with the 2D Mo0.5W0.5S2/CNF/S cathode shows a high specific capacity of 1228 mAh g-1 at 0.1C and much higher cyclic stability over 4 times as compared to the pristine cathodes. The high LiPSs binding energy of catalyst efficiently prevents the shuttling effect and corrosion of Li …
Date:
December 2021
Creator:
Bhoyate, Sanket
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Advanced Data Analytics Academic Program Review
This report summarizes an evaluation of the UNT Libraries' Advanced Data Analytics-related resources and materials to determine if the collection is adequately serving patron needs. It was generated as part of the UNT Libraries’ contributions to the university’s Academic Program Reviews, which are conducted by the Accreditation office in the Division of Planning. The UNT Libraries’ Collection Assessment Department evaluated collections’ ability to meet the curricular and research needs of the academic programs being reviewed. They assessed current needs based on course descriptions and research outputs, defined the scope of information needed based on this needs assessment, and evaluated the Libraries’ holdings in these subject areas against the usage, qualitative listings, and requests for materials from other libraries. Specific recommendations for collection development are provided based on the results of these analyses.
Date:
July 28, 2023
Creator:
Harker, Karen
Object Type:
Report
System:
The UNT Digital Library
Advanced Distributed Optimization and Control Algorithms: Theory and Applications
Networked multi-agent systems have attracted lots of researchers to develop algorithms, techniques, and applications.A multi-agent networked system consists of more than one subsystem (agent) to cooperately solve a global problem with only local computations and communications in a fully distributed manner. These networked systems have been investigated in various different areas including signal processing, control system, and machine learning. We can see massive applications using networked systems in reality, for example, persistent surveillance, healthcare, factory manufacturing, data mining, machine learning, power system, transportation system, and many other areas. Considering the nature of those mentioned applications, traditional centralized control and optimization algorithms which require both higher communication and computational capacities are not suitable. Additionally, compared to distributed control and optimization approaches, centralized control, and optimization algorithms cannot be scaled into systems with a large number of agents, or guarantee performance and security. All of the limitations of centralized control and optimization algorithms motivate us to investigate and develop new distributed control and optimization algorithms in networked systems. Moreover, convergence rate and analysis are crucial in control and optimization literature, which motivates us to investigate how to analyze and accerlate the convergence of distributed optimization algorithms.
Date:
May 2022
Creator:
Zhang, Shengjun
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library