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Suppression of Higher Acoustic Harmonics by Application of Solid-Solid Periodic Layered Structure in Nonlinear Ultrasonics Nondestructive Evaluation Field (open access)

Suppression of Higher Acoustic Harmonics by Application of Solid-Solid Periodic Layered Structure in Nonlinear Ultrasonics Nondestructive Evaluation Field

Nondestructive testing (NDT) using ultrasound band 1-5 MHz, has been widely used for the early-stage detection of structural failure; however, it fails to detectf material degradation, fatigue, and microcracks. NDT with nonlinear ultrasound (NLU) can detect a microscopic discontinuity or imperfection that may be a source of the second harmonic in the reflected signal. In this research, we focus on creating a metamaterial band filter that filters out nonlinearities induced by the instrument itself. A 1D elastic superlattice (SL) acoustic filter is designed with a bandgap in its frequency spectrum that covers the frequency range of second harmonic. The SL is made of periodically alternating Cu and Sn-Pb solder layers. We conducted analytical and numerical calculations to obtain the appropriate thickness of each layer. The metamaterial in this study has the pass band for the fundamental frequency of 5 MHz and the first stop band centered near the frequency of 10 MHz; 5 MHz was chosen because the second harmonic at 10 MHz can detect 200μm micro-scale damage. Experiments with aluminum as the reference specimen and with SL filter were conducted. A function-generator generates 3 pulses sine signal, within the frequency range from 2.5 MHz to 20MHz. Spectral analysis of …
Date: May 2023
Creator: Kang, Jinho
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Toward Leveraging Artificial Intelligence to Support the Identification of Accessibility Challenges

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 …
Date: May 2023
Creator: Aljedaani, Wajdi Mohammed R M., Sr.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The View and Understanding of 60x30TX at a Rural Community College (open access)

The View and Understanding of 60x30TX at a Rural Community College

This qualitative case study was completed at a rural medium-sized Texas community college and sought to understand how advisors and program coordinators made sense of the 60X30TX policy as it was implemented at their institution. The theoretical framework included community college, the Completion Agenda, structure-agency, and sensemaking. Each community college has its own culture shaped from its history, open access, policies, employees, and students. But the community college is influenced by the state with its mandates and policies, which results in a structure-agency relationship in which the state defines and sets higher education goals, while the community college strives to meet those goals in the way it determines best. The Completion Agenda has influenced state policies shifting the focus of higher education from access to access and completion. The state policy is a catalyst for change at the institution, but change cannot exist without sensemaking. As change occurs, people begin to interpret it based on the environment and their individual and group experiences. Sensemaking becomes central to the theoretical framework with the community college, the structure-agency relationship, and the Completion Agenda. Interviews with 12 people identified four themes: culture of completion, rebuilding advising, dual credit, and Pathways program impact. Participants …
Date: May 2023
Creator: Daley, Christine Marie
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Worker Displacement by Artificial Intelligence (AI): The Impact of Boundary-Spanning Employees

Limited literature examines the impact of the displacement of boundary-spanning employees artificial intelligence (AI). Scholars and practitioners appear focused on tangible benefits of AI adoption, and do not seem concerned by any less tangible and possibly untoward implications of worker (particularly boundary-spanning worker) displacement. My dissertation addresses this gap in the literature. In Essay 1, a qualitative study is performed to anchor the research on the appropriate ethnographic setting, the firms where this displacement phenomenon is taking place, by utilizing the Straussian grounded theory approach. The outcome of iterative coding of the first order data collected from the interviews and content analysis is a conceptual framework which amongst other findings shows how the unique competences of boundary-spanning employees and those of AI are best suited for different spectra of interorganizational collaborative activities. In Essays 2 and 3, I investigate major themes that emerged from Essay 1 utilizing quantitative and qualitative research methods in both studies. Initially I test research models using structural equation modelling on practitioner survey data, after which I probe further via focused interviews to better understand the survey results. The two papers allow us to put forth several theoretical and managerial contributions, specifically emphasizing the positive essential …
Date: May 2023
Creator: Ekezie, Uchenna P.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The World We Want to Leave Behind: White Supremacy in the Apocalyptic Genre's Past, Present, and Future

This dissertation examines the rise of the racialized apocalyptic genre from 1978 to 2019. The period chosen reflects the social shift of the American political right into a party that accepts white supremacy as a tenet. In the post-Civil Rights era, white Americans considered the issue of racism to be solved. With the historic Voting Rights Act and other major victories in the 1960s there was a moment when it seemed America may turn a corner. However, when Richard Nixon took office in 1969, he originated what would be a long process of positioning the American right against intellectualism, minorities, and progress. Nixon, and the development of the new southern strategy would reach decades into the future, utilizing coded language and pitting Americans against one another. Research examining the racialized elements of the American right from Nixon to contemporary times is well chronicled and vast.
Date: May 2023
Creator: Gentry, Jay Axline
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Texas Register, Volume 48, Number 17, Pages 2161-2254 April 28, 2023 (open access)

Texas Register, Volume 48, Number 17, Pages 2161-2254 April 28, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: April 28, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 48, Number 16, Pages 2017-2160 April 21, 2023 (open access)

Texas Register, Volume 48, Number 16, Pages 2017-2160 April 21, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: April 21, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
2023 UNT OA Symposium: Recent Texas Legislation Affecting Course Materials and OER captions transcript

2023 UNT OA Symposium: Recent Texas Legislation Affecting Course Materials and OER

Video recording of the session, "Recent Texas Legislation Affecting Course Materials and OER," for the UNT Open Access Symposium held virtually on April 14, 2023. This session looks at two recent pieces of legislation-- Texas SB 810 (OER course markings) and HB 1027 (disclosure of course material information)--and their implications for Texas institutions of higher education.
Date: April 14, 2023
Creator: Ivie, DeeAnn; McClean, Jessica & Towery, Stephanie
Object Type: Video
System: The UNT Digital Library
Texas Register, Volume 48, Number 15, Pages 1893-2016 April 14, 2023 (open access)

Texas Register, Volume 48, Number 15, Pages 1893-2016 April 14, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: April 14, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 48, Number 14, Pages 1785-1892 April 7, 2023 (open access)

Texas Register, Volume 48, Number 14, Pages 1785-1892 April 7, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: April 7, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
CR News, Volume 28, Number 2, April - June 2023 (open access)

CR News, Volume 28, Number 2, April - June 2023

Quarterly newsletter of the Texas Department of Public Safety Crime Records Division discussing news and activities of the organization as well as other information related to crime records and other safety issue within Texas, along with a departmental directory.
Date: April 2023
Creator: Texas. Crime Records Division.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History

Collection Evaluation for Enhancements: Gaming Production

Presentation used to report the evaluation of UNT Libraries’ holdings supporting the curriculum and research in the area of gaming production.
Date: March 31, 2023
Creator: Harker, Karen; Byrne, Sephra & Obaidullah, Sharif
Object Type: Presentation
System: The UNT Digital Library
Replicate DNA metabarcoding can discriminate seasonal and spatial abundance shifts in river macroinvertebrate assemblages (open access)

Replicate DNA metabarcoding can discriminate seasonal and spatial abundance shifts in river macroinvertebrate assemblages

Article asserts that the delivery of consistent and accurate fine-resolution data on biodiversity using metabarcoding promises to improve environmental assessment and research. The authors propose a novel hierarchical approach to recovering abundance information from metabarcoding, and demonstrate this technique using benthic macroinvertebrates.
Date: March 31, 2023
Creator: Bush, A.; Compson, Z.; Rideout, N. K.; Levenstein, B.; Kattilakoski, M.; Hajibabaei, M. et al.
Object Type: Article
System: The UNT Digital Library
Texas Register, Volume 48, Number 13, Pages 1675-1784 March 31, 2023 (open access)

Texas Register, Volume 48, Number 13, Pages 1675-1784 March 31, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: March 31, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
A content analysis of research on technology use for teaching mathematics to students with disabilities: word networks and topic modeling (open access)

A content analysis of research on technology use for teaching mathematics to students with disabilities: word networks and topic modeling

Authors of article conduct a content analysis of research on technology use for teaching mathematics to students with disabilities. They applied word networks and structural topic modeling of 488 studies published from 1980 to 2021. Results showed that the words “computer” and “computer-assisted instruction” had the highest degree of centrality in the 1980s and 1990s, and “learning disability” was another central word in the 2000s and 2010s.
Date: March 26, 2023
Creator: Shin, Mikyung; Ok, Min Wook; Choo, Sam; Hossain, Gahangir; Bryant, Diane P. & Kang, Eunyoung
Object Type: Article
System: The UNT Digital Library
Texas Register, Volume 48, Number 12, Pages 1603-1674 March 24, 2023 (open access)

Texas Register, Volume 48, Number 12, Pages 1603-1674 March 24, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: March 24, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 48, Number 11, Pages 1479-1602 March 17, 2023 (open access)

Texas Register, Volume 48, Number 11, Pages 1479-1602 March 17, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: March 17, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 48, Number 10, Pages 1371-1478 March 10, 2023 (open access)

Texas Register, Volume 48, Number 10, Pages 1371-1478 March 10, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: March 10, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
The association between posttraumatic disorder symptoms and addictive behaviours in Macao within a sample of female Filipino migrant workers: a network analysis (open access)

The association between posttraumatic disorder symptoms and addictive behaviours in Macao within a sample of female Filipino migrant workers: a network analysis

Article describes how Filipino migrant workers in Macao are vulnerable to posttraumatic stress disorder(PTSD) symptoms and addictive behaviours due to trauma histories, postmigration stressors, and access to alcohol and gambling venues. The current study investigated differential relations between PTSD symptoms and addictive behaviours in a polytrauma exposed sample of Filipino domestic workers in Macao(SAR), China.
Date: March 3, 2023
Creator: Mou, Ngai Lam; Lei, Wai Kit; Balaji, Suvasini; Contractor, Ateka A.; Latkin, Carl A. & Hall, Brian J.
Object Type: Article
System: The UNT Digital Library
Texas Register, Volume 48, Number 9, Pages 1187-1370 March 3, 2023 (open access)

Texas Register, Volume 48, Number 9, Pages 1187-1370 March 3, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: March 3, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
The Briefing, March 2023 (open access)

The Briefing, March 2023

Newsletter of the Texas Commission on Law Enforcement describing news, events, and activities of the Commission, as well as updates about changes to laws or other information of interest to readers.
Date: March 2023
Creator: Texas Commission on Law Enforcement
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History

The Dallas Story: the North American Aviation Plant and Industrial Mobilization During World War II

Access: Use of this item is restricted to the UNT Community
During World War II the United States mobilized its industrial assets to become the great “Arsenal of Democracy” through the cooperation of the government and private firms. The Dallas Story examines a specific aviation factory, operated by the North American Aviation (NAA) company in Dallas, Texas. Terrance Furgerson explores the construction and opening of the factory, its operation, its relations with the local community, and the closure of the facility at the end of the war. Prior to the opening of the factory in 1941, the city of Dallas had practically no existing industrial base. Despite this deficiency, the residents quickly learned the craft of manufacturing airplanes, and by the time of the Pearl Harbor attack the NAA factory was mass-producing the AT-6 trainer aircraft. The entry of the United States into the war brought about an enlargement of the NAA factory, and the facility began production of the B-24 Liberator bomber and the famed P-51 Mustang fighter. By the end of the war the Texas division of NAA had manufactured nearly 19,000 airplanes, making it one of the most prolific U.S. factories.
Date: March 2023
Creator: Furgerson, Terrance
Object Type: Book
System: The UNT Digital Library
Texas Register, Volume 48, Number 8, Pages 997-1186 February 24, 2023 (open access)

Texas Register, Volume 48, Number 8, Pages 997-1186 February 24, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: February 24, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 48, Number 7, Pages 773-996 , February 17, 2023 (open access)

Texas Register, Volume 48, Number 7, Pages 773-996 , February 17, 2023

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: February 17, 2023
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History