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1,199 Matching Results
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Application of Cyclic Polarization of Aluminum 3003 Used in All-Aluminum Microchannel Heat Exchangers
All-aluminum microchannel heat exchangers are designed to significantly reduce refrigerant charge requirements, weight, reduced brazed joints, and decreased potential for leakage by increasing reliability. Al 3003 alloy is corrosion resistant and can be formed, welded, and brazed but the issue with all-aluminum heat exchangers is localized corrosion (pitting) in corrosive environments. Currently, there is no universally accepted corrosion test that all coil manufacturers use to characterize their products. Electrochemical testing method of cyclic polarization was employed in this investigation and relevant parameters including electrolyte corrosive agent and its concentration, electrolyte pH, and applied potential scan rate was varied to find an optimal set of parameters. Results of cyclic polarization of Al 3003 in electrolytes containing various concentrations of NaCl were compared with those of the tests in Sea Water Acidified Accelerated Test (SWAAT) electrolyte and it is shown the SWAAT electrolyte (4.2% sea salt acidified to pH of 2.9) is by far stronger (in terms of corrosivity) than typical 3.5% NaCl solution used in most corrosion testing. Corrosion rates (g/m2yr) of Al 3003 measured in this investigation were comparable to those provided by ISO 9223 standard corresponding to C1 through CX categories. Duration of cyclic polarization test is much shorter …
Date:
May 2015
Creator:
Barnes, Javier
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Application of Marxian and Weberian Theories of Capitalism: the Emergence of Big Businesses in the United States, 1861 to 1890
This study was an examination of businesses that became big businesses in the United States during the time period between the years of 1861 and 1890, a period of time frequently referred to as the “big business era.” The purpose of the study was to identify actions taken by businesses that enabled them to become and remain big businesses. A secondary purpose of the study was to show that these actions were explained by theories of Karl Marx and Max Weber. The results of the study showed that businesses which took specific actions were able to become and remain big businesses and these actions were explained by the theories of Marx and Weber. The results of the study demonstrate the ability of classical sociological theory to explain macro-level social change.
Date:
May 2015
Creator:
Magness, Penny J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Application of the Correlation Consistent Composite Approach to Biological Systems and Noncovalent Interactions
Advances in computing capabilities have facilitated the application of quantum mechanical methods to increasingly larger and more complex chemical systems, including weakly interacting and biologically relevant species. One such ab initio-based composite methodology, the correlation consistent composite approach (ccCA), has been shown to be reliable for the prediction of enthalpies of formation and reaction energies of main group species in the gas phase to within 1 kcal mol-1, on average, of well-established experiment, without dependence on experimental parameterization or empirical corrections. In this collection of work, ccCA has been utilized to determine the proton affinities of deoxyribonucleosides within an ONIOM framework (ONIOM-ccCA) and to predict accurate enthalpies of formation for organophosphorus compounds. Despite the complexity of these systems, ccCA is shown to result in enthalpies of formation to within ~2 kcal mol-1 of experiment and predict reliable reaction energies for systems with little to no experimental data. New applications for the ccCA method have also been introduced, expanding the utility of ccCA to solvated systems and complexes with significant noncovalent interactions. By incorporating the SMD solvation model into the ccCA formulation, the Solv-ccCA method is able to predict the pKa values of nitrogen systems to within 0.7 pKa unit (less …
Date:
May 2015
Creator:
Riojas, Amanda G.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Applications of Single Reference Methods to Multi-Reference Problems
Density functional theory is an efficient and useful method of solving single-reference computational chemistry problems, however it struggles with multi-reference systems. Modifications have been developed in order to improve the capabilities of density functional theory. In this work, density functional theory has been successfully applied to solve multi-reference systems with large amounts of non-dynamical correlation by use of modifications. It has also been successfully applied for geometry optimizations for lanthanide trifluorides.
Date:
May 2015
Creator:
Jeffrey, Chris C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Archaeological Site Vulnerability Modeling for Cultural Resources Management Based on Historic Aerial Photogrammetry and LiDAR
GIS has been utilized in cultural resources management for decades, yet its application has been largely isolated to predicting the occurrence of archaeological sites. Federal and State agencies are required to protect archaeological sites that are discovered on their lands, but their resources and personnel are very limited. A new methodology is evaluated that uses modern light detection and ranging (LiDAR) and historic aerial photogrammetry to create digital terrain models (DTMs) capable of identifying sites that are most at risk of damage from changes in terrain. Results revealed that photogrammetric modeling of historic aerial imagery, with limitations, can be a useful decision making tool for cultural resources managers to prioritize conservation and monitoring efforts. An attempt to identify key environmental factors that would be indicative of future topographic changes did not reveal conclusive results. However, the methodology proposed has the potential to add an affordable temporal dimension to future digital terrain modeling and land management. Furthermore, the methods have global applicability because they can be utilized in any region with an arid environment.
Date:
August 2015
Creator:
Helton, Erin King
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Arduino Based Control System for a Brackish Water Desalination Plant
Water scarcity for agriculture is one of the most important challenges to improve food security worldwide. In this thesis we study the potential to develop a low-cost controller for a small scale brackish desalination plant that consists of proven water treatment technologies, reverse osmosis, cation exchange, and nanofiltration to treat groundwater into two final products: drinking water and irrigation water. The plant is powered by a combination of wind and solar power systems. The low-cost controller uses Arduino Mega, and Arduino DUE, which consist of ATmega2560 and Atmel SAM3X8E ARM Cortex-M3 CPU microcontrollers. These are widely used systems characterized for good performance and low cost. However, Arduino also requires drivers and interfaces to allow the control and monitoring of sensors and actuators. The thesis explains the process, as well as the hardware and software implemented.
Date:
August 2015
Creator:
Caraballo, Ginna
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Áskell Másson’s Solos for Snare Drum: Maximizing Musical Expression Through Varying Compositional Techniques and Experimentation in Timbre
This dissertation and accompanying lecture recital explores the musical elements present in Áskell Másson’s three solos for snare drum, PRÍM (1984), KÍM (2001) and B2B: Back to Basics (2010). Two of the primary challenges for the performer when playing solo literature on a non-pitch oriented instrument are identifying thematic structures and understanding how to interpret all innovative sound production techniques employed within the music. A thematic and compositional analysis, as well as an investigation into the experimentation of timbre found in Másson’s three pieces for solo snare drum will help to clarify the musical complexities that are present throughout.
Date:
December 2015
Creator:
O’Neal, John Micheal
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Assessment of Cataloging Services in an Academic Library
Presentation for the 2015 Texas Library Association (TLA) Annual Conference. This presentation discusses the results of a survey that was administered from October 27 through November 17, 2014. The survey assessed how Public Services employees rate the importance of Cataloging and Metadata Services activities, and how satisfied Public Services employees are with Cataloging and Metadata Services activities.
Date:
April 15, 2015
Creator:
Sassen, Catherine; Loafman, Kathryn & Welch, Rebecca
Object Type:
Presentation
System:
The UNT Digital Library
Assessment of Cataloging Services in an Academic Library
This article contains survey data on cataloging services as assessed by personnel in the Public Services Division and the Catalog and Metadata Services Department.
Date:
December 30, 2015
Creator:
Sassen, Catherine; Loafman, Kathryn & Welch, Rebecca
Object Type:
Article
System:
The UNT Digital Library
Assessment of Hot and Cool Executive Functioning Following Trauma Using the Traditional Stroop Task, Emotional Stroop Task, and a Novel Implicit Association Test
Individuals who have experienced a traumatic event and develop Post-Traumatic Stress Disorder (PTSD) frequently show deficits in both primarily “cool” and “hot” cognitive executive functions (e.g., traditional & emotional Stroop tasks, respectively) that can be impacted by high affective salience. Given the dimensional nature of psychopathology, questions remain about individuals within the general population who have experienced trauma but do not meet full criteria for PTSD and yet may manifest problems in these areas, especially areas of hot and cool executive functioning (EF). Thus, the current project was designed to assess hot and cool EF in a relatively large sample of individuals from the general population who have experienced trauma and currently demonstrate sub-clinical levels of post-traumatic symptoms. The Stroop task, Emotional Stroop task, and a novel modified Implicit Association Test were utilized to assess EF across a spectrum of individuals with varying traumatic histories and level of post-traumatic symptoms. Results suggest that a greater frequency of trauma experiences was moderately associated with worse performance on both hot and cool executive functioning measures. Specifically, females within the sample evidenced a close relationship between traumatic experiences, post-trauma symptoms, and executive functioning. Clinical and theoretical implications are discussed.
Date:
December 2015
Creator:
Sullivan, Erin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Assessment of Uncommon Titanium Binary Systems: Ti-Zn, Ti-Cu, and Ti-Sb
The current study focuses on phase stability and evolution in the titanium-zinc titanium-copper and titanium-antimony systems. The study utilized the Laser Engineering Net Shaping (LENS™) processing technique to deposit compositionally graded samples of three binary system in order to allow the assessment of phase stability and evolution as a function of composition and temperature the material is subjected to. Through LENS™ processing it was possible to create graded samples from Ti-xSb (up to 13wt%) and Ti-xCu (up to 16wt%). The LENS™ deposited gradient were solutionized, and step quenched to specific aging temperature, and the resulting microstructures and phase were characterized utilizing XRD, EDS, SEM, FIB and TEM. The Ti-Zn system proved incapable of being LENS™ deposited due to the low vaporization temperature of Zn; however, a novel processing approach was developed to drip liquid Zn onto Ti powder at temperatures above β transus temperature of Ti (882 ◦C) and below the vaporization temperature of Zn (907 ◦C). The product of this processing technique was characterized in a similar way as the graded LENS™ depositions. From measurements performed on Ti-Sb it seems that Sb could be a potential α stabilizer in Ti due to the presence of a mostly homogeneous α …
Date:
May 2015
Creator:
Brice, David
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Associations Between Physical Fitness and Academic Achievement: A Meditational Analysis
Research has illustrated the interrelatedness of childhood physical fitness and psychological wellbeing, psychological wellbeing and academic achievement, as well as physical fitness and academic achievement. In this study, we proposed that psychological wellbeing (self-esteem and depression) serves as a mediator between physical fitness and academic achievement during adolescence. In a sample of middle school children (N = 1,530), significant correlations were found between all three variables (p.0001). A hierarchical regression analysis was performed to assess the associations between physical fitness, psychological wellbeing, and academic achievement. The regression analysis reported a significant partial mediation effect. The results of this study supported the proposed hypotheses, including a mechanism of psychological wellbeing partially mediating the relationship between physical fitness and academic achievement. The findings of this study support the importance of encouraging activities to promote both physical fitness and psychological wellbeing in schools.
Date:
May 2015
Creator:
Dorfman, Jocelyn C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Atomistic Simulations of Deformation Mechanisms in Ultra-Light Weight Mg-Li Alloys
Mg alloys have spurred a renewed academic and industrial interest because of their ultra-light-weight and high specific strength properties. Hexagonal close packed Mg has low deformability and a high plastic anisotropy between basal and non-basal slip systems at room temperature. Alloying with Li and other elements is believed to counter this deficiency by activating non-basal slip by reducing their nucleation stress. In this work I study how Li addition affects deformation mechanisms in Mg using atomistic simulations. In the first part, I create a reliable and transferable concentration dependent embedded atom method (CD-EAM) potential for my molecular dynamics study of deformation. This potential describes the Mg-Li phase diagram, which accurately describes the phase stability as a function of Li concentration and temperature. Also, it reproduces the heat of mixing, lattice parameters, and bulk moduli of the alloy as a function of Li concentration. Most importantly, our CD-EAM potential reproduces the variation of stacking fault energy for basal, prismatic, and pyramidal slip systems that influences the deformation mechanisms as a function of Li concentration. This success of CD-EAM Mg-Li potential in reproducing different properties, as compared to literature data, shows its reliability and transferability. Next, I use this newly created potential …
Date:
May 2015
Creator:
Karewar, Shivraj
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Attachment Theory Within Clinical Supervision: Application of the Conceptual to the Empirical
Attachment theory has established itself as applicable to many types of relationships, encompassing caregiver-child, romantic, interpersonal, and psychotherapeutic interactions. This project sought to investigate the application of attachment theory to clinical supervision. Using suggestions put forth in previous work by Watkins and Riggs, this study examined the dyadic interactions inherent in both supervision and attachment. Using the working alliance as determination of the quality of supervision, attachment styles, leader-follower attachment, and attachment-based expectations were explored as predictors for supervisor-trainee dyad outcome in a training clinic for doctoral psychology students. The study design is longitudinal and prospective. Findings indicate the necessity of measurement of supervisory-specific attachment rather than general attachment, the stability of working alliance over time, and the large contribution of the leader-member attachment framework to the understanding of supervisory attachment. Implications include the importance of maintaining hierarchical, evaluative boundaries within supervisory relationship, consistent with a leader-follower dynamic.
Date:
August 2015
Creator:
Wrape, Elizabeth R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Automated Creation of Analytic Catalog Records for Born-Digital Journal Articles
Article summarizing the approach to bibliographic metadata development at the University of Michigan Library for journal articles published and archived in HathiTrust.
Date:
May 19, 2015
Creator:
Hawkins, Kevin S.
Object Type:
Article
System:
The UNT Digital Library
Automatic Language Identification for Metadata Records: Measuring the Effectiveness of Various Approaches
Automatic language identification has been applied to short texts such as queries in information retrieval, but it has not yet been applied to metadata records. Applying this technology to metadata records, particularly their title elements, would enable creators of metadata records to obtain a value for the language element, which is often left blank due to a lack of linguistic expertise. It would also enable the addition of the language value to existing metadata records that currently lack a language value. Titles lend themselves to the problem of language identification mainly due to their shortness, a factor which increases the difficulty of accurately identifying a language. This study implemented four proven approaches to language identification as well as one open-source approach on a collection of multilingual titles of books and movies. Of the five approaches considered, a reduced N-gram frequency profile and distance measure approach outperformed all others, accurately identifying over 83% of all titles in the collection. Future plans are to offer this technology to curators of digital collections for use.
Date:
May 2015
Creator:
Knudson, Ryan Charles
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Automatic Removal of Complex Shadows From Indoor Videos
Shadows in indoor scenarios are usually characterized with multiple light sources that produce complex shadow patterns of a single object. Without removing shadow, the foreground object tends to be erroneously segmented. The inconsistent hue and intensity of shadows make automatic removal a challenging task. In this thesis, a dynamic thresholding and transfer learning-based method for removing shadows is proposed. The method suppresses light shadows with a dynamically computed threshold and removes dark shadows using an online learning strategy that is built upon a base classifier trained with manually annotated examples and refined with the automatically identified examples in the new videos. Experimental results demonstrate that despite variation of lighting conditions in videos our proposed method is able to adapt to the videos and remove shadows effectively. The sensitivity of shadow detection changes slightly with different confidence levels used in example selection for classifier retraining and high confidence level usually yields better performance with less retraining iterations.
Date:
August 2015
Creator:
Mohapatra, Deepankar
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The “Avant-pop” Style of Jacob Ter Veldhuis: Annotated Bibliography of Boombox Pieces with an Analysis of “Pimpin’” for Baritone Saxophone and Boombox
JacobTV has spent over thirty years utilizing his interest in American pop culture as the muse upon which he creates his works. Sources of popular culture including commercials, television evangelists, political speeches, interviews, and urban pop songs have earned him the title of the “Andy Warhol of new music.” His contributions to classical music are significant and include works for solo instruments and voice, chamber ensembles, and large ensembles. This study serves as an annotated bibliography of selected pieces written for saxophone and boombox written by JacobTV. Chapter 2 provides a brief historical background of electronic music and chapter 3 describes JacobTV’s compositional style and vocabulary. The pieces included in the bibliography of chapter 4 are Believer (2006) for baritone saxophone and soundtrack; Billie (2003) for alto saxophone and soundtrack; Buku (2006) for alto saxophone and soundtrack; Garden of Love (2002) for soprano saxophone and soundtrack; Grab It! (1999) for tenor saxophone and soundtrack; May This Bliss Never End (1996) for tenor saxophone, piano, and soundtrack; TaTaTa (1998) for tenor and baritone saxophone and soundtrack; Heartbreakers (1997-98) for saxophone quartet, soundtrack, and video; Jesus Is Coming (2003) for saxophone quartet and soundtrack; Pitch Black (1998) for saxophone quartet and soundtrack; …
Date:
August 2015
Creator:
Roberts, Sarah L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
[Awaiting a decision: a Video taken at the U.S. Supreme Court on Marriage Equality Day]
A short video of the crowds on the steps of the U.S. Supreme Court on the day they announced their decision on Marriage Equality and the Obergefell v. Hodges case.
Date:
June 26, 2015
Creator:
Belden, Dreanna L.
Object Type:
Video
System:
The Portal to Texas History
Back on the Home Front: Demand/Withdraw Communication and Relationship Adjustment Among Student Veterans
Today’s military encompasses a wide variety of families who are affected by deployments in multiple and complex ways. Following deployments, families must reconnect in their relationships and reestablish their way of life. Appropriate and effective communication during this time is critical, yet many military couples struggle with this process. Moreover, student service members/veterans and their families are in a unique position. In addition to coping with changes in their marital relationship, student veterans may feel isolated or unsupported on college campuses, often experiencing anxiety, depression, posttraumatic stress, or suicidality. The current study seeks to bridge the gap between the military family literature and the student service member/veteran literature by examining how deployment experiences, mental health issues, and communication patterns influence post-deployment relationship adjustment among student veterans. Analyses tested whether communication style and/or current mental health concerns mediate associations between combat experiences and couples’ relationship adjustment, as well as between experiences in the aftermath of battle and relationship adjustment. Results suggest that although posttraumatic stress is significantly related to deployment experiences among student veterans, participants report no significant negative effects of deployment on relationship adjustment. Communication style, however, was significantly associated with relationship adjustment, and a lack of positive communication was …
Date:
August 2015
Creator:
Carver, Kellye Diane Schiffner
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
BARC Tips for Tiny Libraries
Report providing tips for small libraries to get started using Biblionix Automated Retrospective Conversion's (BARC's) "Apollo" integrated library system.
Date:
July 3, 2015
Creator:
Brannon, Sian
Object Type:
Report
System:
The UNT Digital Library
The Bass Clarinetist’s Pedagogical Guide to Excerpts From the Wind Band Literature
Student clarinet performers often encounter bass clarinet for the first time in a high school or university wind ensemble, so it is logical for clarinet pedagogues to encourage and assist their students in learning this wind band literature. In addition to becoming familiar with this oft performed repertoire, students will develop a set of specialized bass clarinet skills that one cannot learn on soprano clarinet. These skills include increased air capacity and support, timbre consistency in differing registers, intonation tendencies of the lower instrument, voicing flexibility, right hand thumb dexterity for keys that do not exist on soprano clarinet, technical facility for eleven pinky keys (as opposed to the seven pinky keys on a typical soprano clarinet, and effective altissimo fingerings. The purpose, then, of this document is to provide a performance guide for select bass clarinet solo excerpts from the wind band literature and to provide supplemental exercises intended to help students acquire the specialized bass clarinet skill set they will need in order to perform the selected excerpts successfully. The solos discussed in this document are excerpted from H. Owen Reed’s La Fiesta Mexicana, Florent Schmitt’s Dionysiaques, Percy Grainger’s Lincolnshire Posy, Frank Ticheli’s Blue Shades, William Bolcom’s First …
Date:
August 2015
Creator:
Bland, Britni Cheyenne
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Bass Reeves: a History • a Novel • a Crusade, Volume 1: the Rise
This literary/historical novel details the life of African-American Deputy US Marshal Bass Reeves between the years 1838-1862 and 1883-1884. One plotline depicts Reeves’s youth as a slave, including his service as a body servant to a Confederate cavalry officer during the Civil War. Another plotline depicts him years later, after Emancipation, at the height of his deputy career, when he has become the most feared, most successful lawman in Indian Territory, the largest federal jurisdiction in American history and the most dangerous part of the Old West. A preface explores the uniqueness of this project’s historical relevance and literary positioning as a neo-slave narrative, and addresses a few liberties that I take with the historical record.
Date:
August 2015
Creator:
Thompson, Sidney, 1965-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Becoming the Storm
Text of the keynote address delivered during the University of North Texas Lavender Graduation at the end of the Fall 2015 semester.
Date:
November 2015
Creator:
Keralis, Spencer D. C.
Object Type:
Text
System:
The UNT Digital Library