UNT Theses and Dissertations - 402 Matching Results

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Slogans and Opposition Political Culture: Online Discourse in Iran's Green Movement

Description: In this study I investigate the Iranian Green Movement supporters' use of slogans as political discourse on the Persian-language opposition website www.kaleme.com. Data was collected from the website's Kaleme section in the form of 22 articles and 3,500 user comments. A coding scheme was constructed to measure the presence of categories and themes in the site's comments section. Findings support the propositions of narrative theorists (e.g. Franzosi, 1998; Benford, 1993) that frequent use of sl… more
Date: December 2012
Creator: Ryan, Trent
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Solid Lubrication Mechanisms in Laser Deposited Nickel-titanium-carbon Metal Matrix Composites

Description: A Ni/TiC/C metal matrix composite (MMC) has been processed using the laser engineered net shaping (LENS) process from commercially available powders with a Ni-3Ti-20C (atomic %) composition. This processing route produces the in-situ formation of homogeneously distributed eutectic and primary titanium carbide and graphite precipitates throughout the Ni matrix. The composite exhibits promising tribological properties when tested in dry sliding conditions with a low steady state coefficient of fr… more
Date: December 2012
Creator: Mogonye, Jon-Erik
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Somatostatin Receptors on Neuronal Cilia: Evidence for Neuroprotection

Description: Primary cilia are essential in brain development, as mediators of sonic hedgehog signaling. However, their role in mature neurons remains elusive. One means to elucidate their function may be to investigate the function of the somatostatin type 3 receptor (SstR3), which is concentrated on the primary cilia of neurons. The inhibitory and anticonvulsant properties of somatostatin suggest that ciliary SstR3 might protect neurons against excitotoxicity, as seen in epileptic seizures. C57BL/6 wi… more
Date: December 2012
Creator: Evans, Shakila K.
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Source and Channel Coding Strategies for Wireless Sensor Networks

Description: In this dissertation, I focus on source coding techniques as well as channel coding techniques. I addressed the challenges in WSN by developing (1) a new source coding strategy for erasure channels that has better distortion performance compared to MDC; (2) a new cooperative channel coding strategy for multiple access channels that has better channel outage performances compared to MIMO; (3) a new source-channel cooperation strategy to accomplish source-to-fusion center communication that reduc… more
Date: December 2012
Creator: Li, Li
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Spatio-temporal Variation of Nitrate Levels in Groundwater in Texas, 1970 to 2010

Description: This study looks at spatial variation of groundwater nitrate in Texas and its fluctuations at 10 year increments using data from the Texas Water Development Board. While groundwater nitrate increased in the Ogallala and Seymour aquifers across the time period, the overall rate in Texas appears to be declining as time progresses. However, the available data is limited. Findings show that a much more targeted, knowledge based strategy for sampling would not only reduce the cost of water qualit… more
Date: December 2012
Creator: Rice, Susan C.
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Staying Connected: Technology Use in Grandparent-grandchild Relationships

Description: Despite the distance that often separates grandparents from their young adult grandchildren, the abundance of new technologies provides numerous means of connection for the grandparent-grandchild (GP-GC) dyad. The purpose of this study was to understand how grandparents use technology, namely text messaging and Facebook, in relationships with their young adult grandchildren. Specifically, the aim was to understand grandparents' purposes for using these technologies with their grandchildren, the… more
Date: December 2012
Creator: Novak, Hannah R.
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The Structural Determinants of Americans' Justice Perceptions Toward Inequality in the U.S.

Description: In accordance with structural theory and distributive justice theory, this study investigates if Americans' personal encounters with the opportunity structure and their existing reward conditions will influence their perceptions toward distribution outcomes in the U.S. I argue that higher-status individuals possessing various "attributes of structural privilege" will exhibit less support for regulating income inequality in society than lower-status individuals. Upward mobility should also be ne… more
Date: December 2012
Creator: Ong, Corinne
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Student Facilitation and Predictors of Engagement in Peer-Led Literature Circle Discussions

Description: The purpose of this research was to examine the relation between students' personality traits and the extent of their engagement and facilitation in peer-led literature circle discussions. The research was guided by two questions. To what extent do reading ability, gender, and personality traits predict the quality of verbal engagement in literature circles? and How do highly engaged participants facilitate discussion in the circles? The researcher video-taped 17 fourth-grade students' literat… more
Date: December 2012
Creator: Young, Chase
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Students' Attitudes Towards Rapport-building Traits and Practices in Online Learning Environments

Description: This research was a triangulated study of student attitudes towards instructors' rapport-building traits and their preferences amongst instructors' rapport-building practices in online learning environments. Participants were undergraduate and graduate students enrolled in courses within an educational technology program at a central Texas university. The study employed a mixed-methods approach involving the Likert-item assessment of learners' attitudes, the identification and prioritization of… more
Date: December 2012
Creator: Wright, Robert Demmon
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Study of Novel Ion/surface Interactions Using Soft-landing Ion Mobility

Description: Preparative mass spectrometry is a gas-phase ion deposition technique aimed at deposition of monodisperse ion beams on a surface. This is accomplished through the implementation of a soft-landing ion mobility system which allows for high ion flux of conformationally selected ion packets. The soft-landing ion mobility system has been applied to a number of unique chemical problems including the deposition of insulators on graphene, the preparation of reusable surface enhanced Raman spectroscop… more
Date: December 2012
Creator: Hoffmann, William Darryle
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Sustainable Environmental Identities for Environmental Sustainability: Remaking Environmental Identities with the Help of Indigenous Knowledge

Description: Early literature in the field of environmental ethics suggests that environmental problems are not technological problems requiring technological solutions, but rather are problems deeply rooted in Western value systems calling for a reorientation of our values. This dissertation examines what resources are available to us in reorienting our values if this starting point is correct. Three positions can be observed in the environmental ethics literature on this issue: 1. We can go back and rei… more
Date: December 2012
Creator: Parker, Jonathan
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Teacher Perception of Project-Based Learning in a Technology-infused Secondary School Culture: a Critical Ciné-ethnographic Study

Description: Project-based learning has long been used in the educational realm as it emphasis a student-centered strategy which promotes meaning, enriched learning that enhances inquiry and problem-solving skills in a rich, authentic environment. The relevance and authentic design of projects may further be enhanced by the use of technology in the classroom. Technology is rapidly changing the face of American education in ways that were barely thinkable as little as five years before and provides the possi… more
Date: December 2012
Creator: Gratch, Jonathan
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Theoretical and Experimental Investigations of Peg Based Thermo Sensitive Hydro Microgel

Description: Poly ethylene glycol (PEG) based microgels were synthesized and investigated. The PEG microgel has the same phase transition as the traditional poly N-isopropylacrylamide (PNIPAM). As a good substitute of PNIPAM, PEG microgel exhibits many advantages: it is easier to control the lower critical solution temperature (LCST) of the microgel by changing the component of copolymers; it has a more solid spherical core-shell structure to have a double thermo sensitivity; it is straightforward to add ot… more
Date: December 2012
Creator: Chi, Chenglin
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Thermochemistry Investigations Via the Correlation Consistent Composite Approach

Description: Since the development of the correlation consistent composite approach (ccCA) in 2006, ccCA has been shown to be applicable across the periodic table, producing, on average, energetic properties (e.g., ionization potentials, electron affinities, enthalpies of formation, bond dissociation energies) within 1 kcal/mol for main group compounds. This dissertation utilizes ccCA in the investigation of several chemical systems including nitrogen-containing compounds, sulfur-containing compounds, and c… more
Date: December 2012
Creator: Jorgensen, Kameron R.
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The Use of Conjugate Reinforcement in Autism Treatment Programs: a Demonstration and Discussion

Description: The effect of a reinforcer on behavior is largely determined by the schedule in which it is implemented. One type of reinforcement schedule that has not been explored extensively is conjugate reinforcement. Previous researchers have used conjugate schedules to evaluate a reinforcer's effects on behavior and as an assessment tool. However, none have explored how to effectively engineer conjugate schedules in applied settings. The current study explores the effectiveness of conjugate reinforcemen… more
Date: December 2012
Creator: Reetz, Stephany Kristina
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Variations in Suicidal Ideation Among Substance Users

Description: Research suggests that substance use is a risk factor for increased suicidal ideation. This study explored the relationship between substance use, suicidal ideation, and impulsivity in a sample of college students and individuals seeking outpatient treatment. Participants were interviewed for information on severity of suicidal ideation and substance use. Participants completed the Psychiatric Diagnostic Screening Questionnaire, the substance use section of the Structured Clinical Interview for… more
Date: December 2012
Creator: Nichols, Erica
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Water-soluble Phosphors for Hypoxia Detection in Chemical and Biological Media

Description: Water-soluble Pt(II) phosphors exist predominantly for photophysical studies. However, fewer are known to be candidates for cisplatin derivatives. If such a molecule could exist, it would be efficient at not only destroying the cancerous cells which harm the body, but the destruction would also be traceable within the human body as it occurred. Herein, research accomplished in chemistry describes the photophysical properties of a water-soluble phosphor. Spectroscopically, this phosphor is uniqu… more
Date: December 2012
Creator: Satumtira, Nisa Tara
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Zero Anaphora and Meithei

Description: The focus of this thesis is to determine what factors predict zero anaphora in Meithei. The data for this thesis is derived from pear stories. Arguments were tabulated in spreadsheets counting nouns, pronouns, and zero anaphors; they were also examined for their semantic role and information status. The findings showed the agent role was typically represented by reduced forms of reference, the majority of the time by zero anaphora. Other semantic roles were typically represented by lexical f… more
Date: December 2012
Creator: Cockerham, Terence
Item Type: Refine your search to only Thesis or Dissertation
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