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656 Matching Results
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3D Printed Self-Activated Carbon Electrodes for Supercapacitor Applications
This study investigated a new approach to achieving high energy density supercapacitors (SCs) by using high surface area self-activated carbon from waste coffee grounds (WCGs) and modifying 3D printed electrodes' porous structure by varying infill density. The derived activated carbons' surface area, pore size, and pore volume were controlled by thermally treating the WCGs at different temperatures (1000˚C, 1100˚C, and 1200˚C) and post-treating with HCL to remove water-soluble ashes and contaminants that block activated carbon pores. Surface area characterization revealed that the carbon activated at 1000˚C had the highest surface of 1173.48 m2 g-1, and with the addition of HCL, the surface area increased to 1209.35 m2 g-1. This activated carbon was used for fabricating the electrodes based on the surface area and having both micropores and macropores, which are beneficial for charge storage. Direct ink writing (DIW) method was utilized for 3D printing SC electrodes and changing the electrode structure by increasing the infill densities at 30%, 50%, and 100%. Upon increasing the infill densities, the electrodes' mass increased linearly, porosity decreased, and the total surface area increased for the 30% and 50% infill electrodes but decreased for the 100% infill electrode. Cyclic voltammetry (CV) test on the assembled …
Date:
July 2023
Creator:
Disi, Onome Aghogho
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Abraham Solvation Parameter Model: Calculation of L Solute Descriptors for Large C11 to C42 Methylated Alkanes from Measured Gas–Liquid Chromatographic Retention Data
This article determines Abraham model L solute descriptors for 149 additional C11 to C42 monomethylated and polymethylated alkanes based on published Kovat’s retention indices based upon gas–liquid chromatographic measurements.
Date:
July 5, 2022
Creator:
Wu, Emily; Sinha, Sneha; Yang, Chelsea; Zhang, Miles & Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Abraham Solvation Parameter Model: Examination of Possible Intramolecular Hydrogen-Bonding Using Calculated Solute Descriptors
This article calculates Abraham model solute descriptors using published solubility data for 4,5-dihydroxyanthraquinone-2-carboxylic acid dissolved in several organic solvents of varying polarity and hydrogen-bonding character.
Date:
July 24, 2022
Creator:
Sinha, Sneha; Yang, Chelsea; Wu, Emily & Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Accessibility and Pedagogical Value in Virtuosic American Trombone Solo Literature: A Performance Guide to "Divertimento for Trombone and Band" (2012) by Jack Stamp
This dissertation is an examination of Divertimento for Solo Trombone and Wind Band by renowned wind band composer and conductor Jack Stamp. The result of this study is the illumination of a 21st-century composition for solo trombone and band that is made accessible for future performers, accomplished by constructing original musical exercises that are influenced by current trombone pedagogical materials that have either been edited, annotated or created by current performers and pedagogues such as Joseph Alessi, Brad Edwards and Michael Mulcahy. The piece also incorporates 20th -century American wind band influences. The careful selection of pedagogical materials serves the purpose of making this challenging solo accessible for the advanced academic trombonist and can serve as a template for surveying advanced literature of the present and future. Additionally, the pedagogical materials selected for use in this dissertation were considered based on their value in the present academic trombone repertory. Thus, this performance guide reflects on the validity of the modern trombone pedagogical literature to guide a performer's study, interpretation, and performance of a 21st-century work for solo trombone.
Date:
July 2023
Creator:
Umholtz, Jeremiah L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Acoustic Metasurface-Aided Broadband Noise Reduction in Automobile Induced by Tire-Pavement Interaction
Article demonstrating a technique utilizing acoustic metasurfaces (AMSes) with high reflective characteristics using relatively lightweight materials for noise reduction without any change in mechanical strength or weight of the tire. The proposed design can significantly reduce the noise arising from tire–pavement interaction over a broadband of acoustic frequencies under 1000 Hz and over a wide range of vehicle speeds using a negative effective dynamic mass density approach.
Date:
July 30, 2021
Creator:
Heo, Hyeonu; Sofield, Matthew; Ju, Jaehyung & Neogi, Arup
Object Type:
Article
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
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 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
AI, Arts & Design: Questioning Learning Machines
Article is an introduction to Artnodes issue No. 26, “AI, Arts & Design: Questioning Learning Machines" which addresses the question: Does generative and machine creativity in the arts and design represent an evolution of “artistic intelligence,” or is it a metamorphosis of creative practice yielding fundamentally distinct forms and modes of authorship?
Date:
July 2020
Creator:
West, Ruth & Burbano, Andres
Object Type:
Article
System:
The UNT Digital Library
Air Breathing Fish: Development of Air Breathing in Bristlenose Plecos (Ancistrus cirrhosus)
The bristlenose pleco (Ancistrus cirrhosus) is a species of armored catfish in the Loricariidae family that breathes air facultatively when the aquatic environment becomes hypoxic. The bristlenose pleco uses its highly vascularized stomach as an air breathing organ. The two main goals of this developmental study were to determine the size of onset of air breathing and to determine the frequency of air breathing behavior in bristlenose plecos from juveniles to adults. Developing juveniles reach functional maturity within four to six months of hatching and grow to an adult size of eight to ten cm in length. To examine the developmental timing for the onset of air breathing, we tested different sized juveniles beginning at one cm up until 8 cm in length. The developmental timing for the onset of air breathing was measured by exposing each fish to a slowly decreasing aquatic oxygen content from 100% air saturation down to 8% air saturation. Fish were first able to breathe air at just over 2 cm and 1 gram in mass. There was a weak negative correlation between fish length and % air saturation at which air breathing began. When exposed to 15% air saturation, frequency of air breathing was …
Date:
July 2023
Creator:
Crowder, Lauren Whitney
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
[Alexa Campos and Riley Hammack at the University of North Texas Freshman Orientation 11]
Photograph of Alexa Campos and Riley Hammack at the University of North Texas (UNT) Freshman Orientation 11 on July 27, 2023. Students visited the UNT Libraries table where they learned about Keeper and decided to start archiving their time at UNT at orientation.
Date:
July 27, 2023
Creator:
Miller, Jonathan
Object Type:
Photograph
System:
The UNT Digital Library
All for the Greater Good: A Strategic, Tactical, and Operational Level Analysis of Supply Chain Goal and Incentive Alignment
Goal and incentive alignment are a means of establishing collaborative behavior in supply chains. Essay 1 examines goal and incentive alignment at the strategic level in the purchasing process. It employs survey research in conjunction with structural equation modelling to examine the source selection strategy as a means of aligning the goals of the offeror with those of the buyer. Essay 2 examines goal and incentive alignment at the tactical level. It uses discrete event simulation to explore how the pursuit of localized profit objectives affects the global profitability of a supply chain. Lastly, Essay 3 examines goal and incentive alignment at the operational level. By employing a hybrid simulation approach to model a complex product refurbishment process, this research demonstrates that evaluating subprocesses based solely on their throughput does not equate to greater cost savings for the company at the focal point of this case study. These essays contribute to the body of knowledge in several ways. To the best of the author's knowledge, Essay 1 demonstrates the first empirical linkage, in the realm of public procurement, between the fear of a bid protest and the appropriateness of the sourcing strategy. Similarly, Essay 2 represents the first adaptation of …
Date:
July 2023
Creator:
McConville, Sean Cask
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
[Almonte Captured - Granite Marker and San Jacinto Monument]
Photograph a granite marker at the San Jacinto Battleground State Historic Site with the Monument rising in the background. Marker reads: "No 17 Almonte captured and greatest carnage of battle occurred."
Date:
July 7, 2022
Creator:
Hicks, William
Object Type:
Photograph
System:
The Portal to Texas History
The Altus Times (Altus, Okla.), Vol. 114, No. 53, Ed. 1 Thursday, July 2, 2020
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 2, 2020
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 114, No. 54, Ed. 1 Thursday, July 9, 2020
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 9, 2020
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 114, No. 54, Ed. 1 Thursday, July 16, 2020
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 16, 2020
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 114, No. 55, Ed. 1 Thursday, July 23, 2020
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 23, 2020
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 114, No. 56, Ed. 1 Thursday, July 30, 2020
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 30, 2020
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 115, No. 26, Ed. 1 Thursday, July 1, 2021
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 1, 2021
Creator:
Hilley, Kevin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 115, No. 27, Ed. 1 Thursday, July 8, 2021
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 8, 2021
Creator:
Hilley, Kevin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 115, No. 28, Ed. 1 Thursday, July 15, 2021
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 15, 2021
Creator:
Hilley, Kevin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 115, No. 29, Ed. 1 Thursday, July 22, 2021
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 22, 2021
Creator:
Hilley, Kevin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 115, No. 30, Ed. 1 Thursday, July 29, 2021
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 29, 2021
Creator:
Hilley, Kevin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Alumni Spotlight #2: How to Disaster-Proof a Business with Steve Conwell
Podcast produced by the Osher Lifelong Learning Institute (OLLI) that features an interview with UNT Alumnus Steve Conwell, CEO of Final Ascent and Board Member of the UNT Alumni Association. Susan and Steve discuss how he helps business owners prepare their businesses for sale, and the effects of the COVID-19 pandemic on the buying and selling market.
Date:
July 1, 2020
Creator:
University of North Texas. Osher Lifelong Learning Institute.
Object Type:
Sound
System:
The UNT Digital Library