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419 Matching Results
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Mechanisms of Ordered Gamma Prime Precipitation in Nickel Base Superalloys
Commercial superalloys like Rene88DT are used in high temperature applications like turbine disk in aircraft jet engines due to their excellent high temperature properties, including strength, ductility, improved fracture toughness, fatigue resistance, enhanced creep and oxidation resistance. Typically this alloy's microstructure has L12-ordered precipitates dispersed in disordered face-centered cubic γ matrix. A typical industrially relevant heat-treatment often leads to the formation of multiple size ranges of γ¢ precipitates presumably arising from multiple nucleation bursts during the continuous cooling process. The morphology and distribution of these γ′ precipitates inside γ matrix influences the mechanical properties of these materials. Therefore, the study of thermodynamic and kinetic factors influencing the evolution of these precipitates and subsequent effects is both relevant for commercial applications as well as for a fundamental understanding of the underlying phase transformations. The present research is primarily focused on understanding the mechanism of formation of different generations of γ′ precipitates during continuous cooling by coupling scanning electron microscopy (SEM), energy filtered TEM and atom probe tomography (APT). In addition, the phase transformations leading to nucleation of γ′ phase has been a topic of controversy for decades. The present work, for the first time, gives a novel insight into the mechanism …
Date:
May 2011
Creator:
Singh, Antariksh Rao Pratap
System:
The UNT Digital Library
Portrait of a southern Progressive: The political life and times of Governor Pat M. Neff of Texas, 1871-1952
Pat M. Neff was a product of his political place and time. Born in Texas in 1871, during Reconstruction, he matured and prospered while his native state did the same as it transitioned from Old South to New South. Neff spent most of his life in Waco, a town that combined New South Progressivism with religious conservatism. This duality was reflected in Neff's own personality. On moral or religious issues, he was conservative. On economic and social issues, he was Progressive. He thus was a typical Southern Progressive who de-emphasized social and political change in favor of economic development. For instance, as governor from 1921 to 1925, his work to develop and conserve Texas' water resources brought urbanization and industrialization that made the New South a reality in the state. Neff was a devout Baptist which influenced his politics and philosophy. He was president of Baylor University, a Baptist institution, for fifteen years after leaving the governor s office and he led the Southern Baptist Convention (SBC) in the 1940s. He combined Progressive and Christian values as he argued for the establishment of the United Nations and advocated forgiveness and brotherhood after World War II. The war's end marked the …
Date:
May 2011
Creator:
Stanley, Mark
System:
The UNT Digital Library
Mosques in France: The Visible Presence of Islam
Numerous laws are being directed toward subduing the visible presence of Islam throughout France, and in return French Muslims are becoming bolder in the projection of their faith. This thesis examines the presence of Islam in France throughout history and in contemporary French civilization. Specifically, this thesis addresses the issues regarding the visible presence of Islam in France through such institutions as mosques and how they are the key symbols representing the prominence of Islam in France. It looks at what lies in the collective French mind that creates such an influence on today's policies and outlook, as well as identifies the key characters that dominate the current affairs surrounding Islam in France. The thesis reviews the country's past relations with the visible presence of Islam through the controversies surrounding the construction of famous mosques. In addition, this thesis underlines key areas where both the State and the Muslim population must make concessions in order to avoid further conflict.
Date:
May 2011
Creator:
Arnold, Ashley Patricia
System:
The UNT Digital Library
“Civilizations without Boats”: Stories
This collection consists of a critical preface and nine short stories. Extrapolating from the work and legacy of Michel Foucault, the preface theorizes a genre of “heterotopian fiction” as constitutive of a fundamentally ethical approach to narrative creativity, distinguishing its functional and methodological characteristics from works that privilege aesthetic, thematic, or technical artistry. The stories explore spaces of madness, alterity, incomprehensibility, and liminal experience. Collection includes the stories “Mexico,” “Civilizations without Boats,” The Widow’s Mother,” “Guys Like Us,” “Everything You’d Hoped It Would Be,” “A Concerned Friend,” “Crisis Hotline,” “Coast to Coast,” and “The Ghosts of Rich Men.”
Date:
August 2011
Creator:
Hubbs, Travis
System:
The UNT Digital Library
ADHD Symptomology and Overweight Among College Men
Attention deficit/hyperactivity disorder (ADHD) is a childhood disorder that often persists into adulthood. Among adults, ADHD is highly comorbid with addictive behaviors (e.g., substance abuse and dependence), and depressive disorders. Recently, an association between ADHD and obesity has been reported in the literature; emotional and binge eating may be “addictive behaviors” that contribute to weight gain in this population. The purpose of this study was to test competing models of the hypothesized link between ADHD symptomology and overweight. Specifically, in Model 1, symptoms of depression are expected to mediate the relationship between symptoms of impulsivity and inattention and emotional and binge eating which, in turn, leads to weight gain (i.e., increased BMI). In Model 2, however, the impulsive symptoms have direct relationships with emotional and binge eating in addition to being mediated by depressive symptoms. Structural equation modeling (SEM) was employed to test how the models fit the data of 790 college men. Both models fit the data well, with Model 2 being preferred because of its greater connection to theory. All paths were significant indicating that increased impulsive and inattentive symptoms predicted increased symptoms of depression that, in turn, predicted increased emotional/binge eating, which has a direct and positive …
Date:
December 2011
Creator:
Johnson, Leslee M.
System:
The UNT Digital Library
Miscegenated Narration: The Effects of Interracialism in Women's Popular Sentimental Romances from the Civil War Years
Critical work on popular American women's fiction still has not reckoned adequately with the themes of interracialism present in these novels and with interracialism's bearing on the sentimental. This thesis considers an often overlooked body of women's popular sentimental fiction, published from 1860-1865, which is interested in themes of interracial romance or reproduction, in order to provide a fuller picture of the impact that the intersection of interracialism and sentimentalism has had on American identity. By examining the literary strategy of "miscegenated narration," or the heteroglossic cacophony of narrative voices and ideological viewpoints that interracialism produces in a narrative, I argue that the hegemonic ideologies of the sentimental romance are both "deterritorialized" and "reterritorialized," a conflicted impulse that characterizes both nineteenth-century sentimental, interracial romances and the broader project of critiquing the dominant national narrative that these novels undertake.
Date:
May 2011
Creator:
Beeler, Connie
System:
The UNT Digital Library
Orchestral Etudes: Repertoire-Specific Exercises for Double Bass
In this project, frequently required double bass orchestral audition excerpts as well as their individual technical difficulties are identified. A survey of professional double bass players and teachers currently and formerly employed by major orchestras, universities, and conservatories have participated to validate the importance of four of the most frequently required orchestral excerpts: Ludwig van Beethoven’s Symphony No. 9, Mvt. 4, and Symphony No. 5, Mvt. 3; Richard Strauss’ Ein Heldenleben; and Wolfgang Amadeus Mozart’s Symphony No. 40, Mvt. 1. The survey respondents identified the primary and secondary technical concerns of each of the four excerpts. I have created technical studies, or etudes, that specifically address these difficulties and help fill a literary gap within the existing pedagogical resources for the double bass.
Date:
August 2011
Creator:
Unzicker, Jack Andrew
System:
The UNT Digital Library
Ecological Analysis of Physical Activity and Health-related Quality of Life in Female College Students.
Health-related quality of life (HRQOL) is a comprehensive construct including physical and psychosocial health functioning. Despite significant health benefits of regular physical activity (PA), over 40% of female college students do not meet recommended PA guidelines to improve their health. This study investigated the influences of individual, social, and physical environmental factors on students’ PA and HRQOL. Participants were 235 female university students who completed validated surveys assessing their perceptions of PA, HRQOL, and social ecological factors. Three hierarchical regressions revealed individual and physical environmental factors as predictors of PA and HRQOL. These findings indicated health professionals need to consider students’ individual factors and physical environmental factors to promote female students’ PA and HRQOL.
Date:
December 2011
Creator:
Dunn, Jacqueline
System:
The UNT Digital Library
Texas Middle School Choral Directors’ Beliefs About Repertoire Selection
Secondary choral directors often demonstrate a wide variety of organizational, instructional, and musical skills to promote and nurture thriving programs. Among the many tasks executed, choosing repertoire might be viewed as one of the most important duties performed. Material chosen for study is often the vehicle through which curricular concepts are taught. Multiple factors might influence middle school choral directors’ beliefs about repertoire choices. Ironically, repertoire choices might or might not reflect educators’ actual teaching philosophies; nevertheless, these decisions could influence student learning. This study surveyed a stratified random sampling of Texas middle school choral directors who participated in the 2010 University Interscholastic League Concert and Sight-reading competition (n = 209). Seventy middle school choral directors participated in the study. Each director took an online survey and indicated the degree to which they agreed or disagreed with 14 statements concerning repertoire choice. Many of the belief statements showed teachers were overwhelmingly in concordance with their beliefs (92.9%). Results indicated that beliefs were similar, regardless of who chose the curriculum or the amount of discussion perceived in undergraduate training. The only belief statement that continually showed differences between teachers concerned students’ ability to vote on repertoire.
Date:
December 2011
Creator:
Williams, Scott Michael, Jr.
System:
The UNT Digital Library
Re-Branding Palliative Care: Assessing Effects of a Name Change on Physician Communicative Processes During Referrals
Although provision of palliative care on the United States is growing, referrals to the service are often late or non-existent. The simultaneous care model provides a blueprint for the most progressive form of palliative care, which is palliation and disease-oriented treatments delivered concurrently. Research indicates the existence of a widespread misconception that associates palliative care with imminent death, and some organizations have chosen to re-brand their palliative care services to influence this perception. The goal of this study was to assess the effects of a name change from palliative care to supportive care on the communicative process during referrals to the service.
Date:
May 2011
Creator:
Burt, Stephanie
System:
The UNT Digital Library
Exploring Hidden Student Perceptions About College-going Culture At House Bill 400 Schools In The Dallas Fort Worth Metroplex
In accordance with the Texas Higher Education Coordinating Boards’ Closing the Gaps by 2015, this research study analyzed self-reported perceptions about college-going culture from students (n = 151) who attended four House Bill 400 schools serving Latino and African American communities in the Dallas-Fort Worth Metroplex. This study utilized exploratory factor analysis (EFA) with a maximum likelihood extraction technique to identify hidden perceptions (latent factors) that account for common variance among student perceptions about college-going culture. The study also tested the validity and inter-item reliability of the 15-item College-Going Culture Survey used in data collection. The parallel analysis, EFA, and Cronbach’s ? identified two latent factors of Verified College Potential (? = .70) and College Capital Awareness (? = .71) that, together, explained 40.1% of students’ perceptions. The two factors were non-significantly negatively correlated (r = -.495, p = .354). By utilizing the two latent constructs, a 10-item revised College-Going Culture Survey is recommended to improve the inter-item reliability coefficient from ? = .46 to ? = .77. Descriptive statistics revealed that Latino and African-American students affirmed aspects of the college-going culture at HB 400 schools. However, latent factors suggest the possibility that students who reportedly feel most encouraged to …
Date:
December 2011
Creator:
Willis, Roderick C., II
System:
The UNT Digital Library