UNT Theses and Dissertations - 189 Matching Results

Search Results

Results: 1 - 24 next
open access

Two-Phase Spray Cooling with Water/2-Propanol Binary Mixtures for High Heat Flux Focal Source

Description: Two-phase spray cooling has been an emerging thermal management technique offering high heat transfer coefficients and critical heat flux levels, near-uniform surface temperatures, and efficient coolant usage that enables to design of compact and lightweight systems. Due to these capabilities, spray cooling is a promising approach for high heat flux applications in computing, power electronics, and optics. Two-phase spray cooling inherently depends on saturation temperature-pressure relations… more
Date: December 2016
Creator: Obuladinne, Sai Sujith
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Exploratory User Research for a Website that Provides Resources for Educators of American Indian Students in Higher Education

Description: Several studies have indicated that American Indian students in the United States higher education system confront unique challenges that derive from a legacy of colonialism and assimilationist policies (Huff 1997). Several scholars, American Indian and non-Native alike, have explored the effects of this history upon students in higher education (Brayboy 2004; Guillory and Wolverton 2008; Waterman and Lindley 2013). Very few, however, have explored the role of the educators of American Indian s… more
Date: December 2016
Creator: Roth, Heather S.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Using Relational Responding to Examine the Acquisition of Mindfulness and Meditation Material: An Analogue Study

Description: Mindfulness meditation is a growing area of interest for both mental health professionals and the general public alike. Beneficial outcomes are associated with these practices, although the variety of measurement techniques makes research difficult to interpret. Definitions of these constructs are varied, and anecdotal accounts point to the idea that many people hold misconceptions about mindfulness and meditation, even when meanings are made clear. Still, no formal research has been published … more
Date: December 2016
Creator: Lester, Ethan G.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

What's in Your Garden? Assessing the "Eco-friendliness" of Plant Choices of Denton, Texas Gardeners

Description: Urbanization is seen as a threat to biodiversity within urban ecosystems, which are largely reliant on humans for their composition. Two types of extremes exist in the spectrum of urban domestic gardens; on one end, the typical urban garden which is planted by landscapers at the time the house is built and is generally left unchanged, and, at the other, a "wild" landscape planted entirely with native plants which provides habitat for native fauna and pollinators. This study assesses the plant… more
Date: December 2016
Creator: Cloutier, Andrea Nicole
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The Relation of Perceived Motivational Climate, Mindset, and Achievement Goal Orientation to Grit in Male High School Soccer Players

Description: Grit is defined as "perseverance and passion for long-term goals." Although studied in relation to various outcomes, such as retention and academic performance, few studies have examined variables that may contribute to grit's development. Further, few studies have examined this construct in relation to sport performance or within athletic environments, despite its clear connection to sport-related constructs like mental toughness and resilience. Thus, based in achievement motivation theory, th… more
Date: December 2016
Creator: Albert, Erin D.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Analyzing Tuberculosis Vulnerability and Variables in Tarrant County

Description: Over 9 million new cases of tuberculosis (TB) were reported worldwide in 2013. While the TB rate is much lower in the US, its uneven distribution and associated explanatory variables require interrogation in order to determine effective strategies for intervention and control. However, paucity of case data at fine geographic scales precludes such research. This research, using zip code level data from 837 confirmed TB cases in Tarrant County obtained from Texas Department of State Health Servic… more
Date: December 2016
Creator: McGlone, John Francis
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Improving the Long-term Performance of PVC Compositions

Description: PVC are extensively applied in many fields, such as cables, pipes, vehicles, shoes, toys and infusion bags. Generally, plasticizers are blended with PVC to improve the ability of process in industrial production; however, the toxic plasticizers will gradually migrate to the surface of products and such a leakage results in brittleness of plasticized PVC and environmental pollution. In other words, humans are frequently exposed to the potential risks. According to previous researches, cross-link… more
Date: December 2016
Creator: Yang, Yu Chia
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Negotiated Living: An Ethno-Historical Perspective of Punta Allen

Description: Situated within the jurisdiction of the Municipality of Tulum and within the Sian Ka'an Biosphere gives the village of Punta Allen a distinctive agency in determining their role in the on-going development of tourism in the region that is not given to other communities in the state. This unique circumstance facilitates a dialogue between the reserve, the municipality, and the business cooperatives of Punta Allen that produce a negotiated living. Through the negotiations with the reserve and Tul… more
Date: December 2016
Creator: McRae, David Thomas
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

An Evaluation of Correspondence between Preference and Performance under a Progressive Ration Schedule with College Students

Description: Preference assessments are used in clinical settings to identify stimuli with reinforcing potential. The progressive-ratio schedule has shown to be useful in clinical assessments in identifying stimuli with stronger reinforcer efficacy that corresponds to formalized assessments.The current study utilized a progressive-ratio schedule to compare videos of high and low preference assessed by verbal reports of preference with college students. Results indicated breakpoints were higher for high pref… more
Date: December 2016
Creator: Johnson, Jamarious
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Ethiopian Coffee Stories: Applied Research with Sidama Coffee Farmers Combining Visual and Ethnographic Methods

Description: The purpose of this study is to demonstrate the value of visual research methods to applied anthropology in the context of exploratory research with farmers in Ethiopia. The three methods of photo-elicitation, participatory photography, and ethnographic film, enrich and expand ethnographic methods to support the client's objective of supporting farmers. The applied project constructs a narrative from the local perspective to help consumers learn more about farmers' lives. The research focuses o… more
Date: December 2016
Creator: Suter, Paula J.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Dissimilar Friction Stir Welding Between Magnesium and Aluminum Alloys

Description: Joining two dissimilar metals, specifically Mg and Al alloys, using conventional welding techniques is extraordinarily challenging. Even when these alloys are able to be joined, the weld is littered with defects such as cracks, cavities, and wormholes. The focus of this project was to use friction stir welding to create a defect-free joint between Al 2139 and Mg WE43. The stir tool used in this project, made of H13 tool steel, is of fixed design. The design included an 11 mm scrolled and concav… more
Date: December 2016
Creator: Reese, Gregory A
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Sliding Friction and Wear Behavior of High Entropy Alloys at Room and Elevated Temperatures

Description: Structure-tribological property relations have been studied for five high entropy alloys (HEAs). Microhardness, room and elevated (100°C and 300°C) temperature sliding friction coefficients and wear rates were determined for five HEAs: Co0.5 Cr Cu0.5 Fe Ni1.5 Al Ti0.4; Co Cr Fe Ni Al0.25 Ti0.75; Ti V Nb Cr Al; Al0.3CoCrFeNi; and Al0.3CuCrFeNi2. Wear surfaces were characterized with scanning electron microscopy and micro-Raman spectroscopy to determine the wear mechanisms and tribochemical phase… more
Date: December 2016
Creator: Kadhim, Dheyaa
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Cyclic Polarization of AA 3102 in Corrosive Electrolytes Containing Sodium Chloride and Ammonium Sulfate

Description: Corrosion of all aluminum microchannel heat exchangers present a challenge in automotive and heating, ventilation, and air conditioning (HVAC) industries. Reproducibility of Salt Water Acetic Acid Test (SWAAT) has been questioned and a need to new corrosion tests with better reproducibility has risen. Cyclic polarization, that is an electrochemical test, was explored for its suitability for the assessment of AA 3102 tube material that is currently a popular aluminum alloy used in manufacturing… more
Date: December 2016
Creator: Dorreyatim, Mohammad
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Exploring Ahope Client Satisfaction and Attitudes

Description: I led a participatory action research (PAR) project with the staff and homeless clients of Ahope Day Center in Asheville, North Carolina, which was meant to evaluate client satisfaction with services and attitudes about certain issues. Project is led by an inquiry group consisting of members of Ahope staff and Ahope clients. The project is a co-designed, co-implemented, and co-interpreted mixed-method evaluation of Ahope's services, client attitudes about education and the environment, client a… more
Date: December 2016
Creator: Johnston, Josiah Ramsay
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Cognitive Engagement in Later Life: Descriptive and Explanatory Findings

Description: Findings on the relationship between engagement in lifestyle and cognitive functioning are not consistent; some authors report that engagement in lifestyle predicts an individual's cognitive functioning; while other report that an individual's cognitive functioning predicts the type and level of engagement an individual participates in. The current study will use longitudinal data (N = 235) to investigate the bidirectional relationship between engagement (engaged lifestyle activities) and cogni… more
Date: December 2016
Creator: Abdullah, Bashir
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Unclean Slates: Stories

Description: Unclean Slates: Stories is a collection of seven short stories that comments on the nature of family ties, and how such ties help form a sense of identity. Each story focuses on a separate protagonist, all of whom strive for a new beginning or an escape from some aspect of their current lives. The short story cycle of this collection is held together not by place or characters, but ultimately by the theme of wishing for a new beginning: they share a desire to fix some dissatisfying element of t… more
Date: December 2016
Creator: Gollahon, Catherine
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The 50,000 Watt Blowtorch of the Great Southwest: The History of WBAP

Description: This paper looks at the history of WBAP while examining how programming has changed from 1922-2014 and how WBAPs audience helped shape programming at the station. This paper reveals four formatting changes throughout the stations history and provides in-depth statistical analysis of how WBAPs audience changed during the stations 90 plus years of existence.
Date: December 2016
Creator: Dixon, Chad M
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Teaching Water Safety Skills to Children with Autism Using Behavioral Skills Training

Description: Behavioral skills training (BST) and in situ training (IST) have been evaluated as methods to teach different safety skills to individuals with developmental disabilities. Research on BST has examined topics such as gun safety, abduction prevention, poison avoidance, and sexual abuse prevention. A large safety issue that is missing from the literature is drowning prevention and water safety skills. Drowning is one of the most prevalent issues facing facing children with Autism Spectrum Disorder… more
Date: December 2016
Creator: Tucker, Marilyse
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Modeling of Fracture Toughness of Magnesium Alloy WE43 Before and After Friction Stir Processing

Description: Magnesium alloys are a popular research topic for structural applications because they have a lower density than conventional structural materials, including steel, titanium, and aluminum; however, the reliability and safety of their mechanical properties must be further proven. An important mechanical property for this purpose is fracture toughness, which is the measure of the material's resistance to crack propagation. In this study, a model of an experiment to investigate the fracture toughn… more
Date: December 2016
Creator: Lipscomb, Celena Andrea
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Analysis of Students' Knowledge, Perceptions, and Interest in Engineering Post Teacher Participation in a National Science Foundation (NSF) Research Experience for Teachers (RET) Professional Development

Description: This study examined the impact of the National Science Foundation's Research Experience for Teachers (RET) in engineering at University of North Texas on students after their teachers' participation in the program. Students were evaluated in terms of self-efficacy, knowledge of engineering, perceptions of engineering, and interest in engineering. A 22-item Likert pre/post survey was used for analysis, and participants included 589 students from six high schools, one middle school, and one magne… more
Date: December 2016
Creator: Reeder, Christina
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

When to correct errors when teaching a new task to children with autism

Description: The purpose of this experiment was to investigate Tosti's proposal about the timing of feedback. The study examined whether it is better to correct immediately after the error occurs or whether it is better to wait until immediately before the next opportunity to respond. In addition, it aimed to determine whether corrections delivered at different times produced different learner affects. Four children with autism were taught to label two sets of pictures under the two different conditions. Re… more
Date: December 2016
Creator: Cochrane, Angela J.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Evaluation of Agreement among Respondents to Anecdotal Assessments and Correspondence between Anecdotal and Experimental Analysis Outcomes

Description: Study 1 evaluated agreement among five respondents using the Functional Analysis Screening Tool (FAST), the Motivation Assessment Scale (MAS) and Questions About Behavioral Function (QABF). Respondents provided ratings for 20 target behaviors exhibited by 10 individuals. At least 4/5 raters agreed on the primary maintaining variable in 80% of cases with the FAST, 70% of cases with the MAS, and 55% of cases with the QABF. Study 2 evaluated correspondence between results of anecdotal assessments … more
Date: December 2016
Creator: Frusha, Caroline J.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
Back to Top of Screen