A method was developed for extending a fine-scaled forest gap model to a watershed-scaled landscape, using the Eastern Cross Timbers ecoregion as a case study for the method. A topographic wetness index calculated from digital elevation data was used as a measure of hydrologic across the modeled landscape, and the gap model modified to have with a topographically-based hydrologic input parameter. The model was parameterized by terrain type units that were defined using combinations of USDA soil series and classes of the topographic wetness index. A number of issues regarding the sources, grid resolutions, and processing methods of the digital elevation data are addressed in this application of the topographic wetness index. Three different grid sizes, 5, 10, and 29 meter, from both LiDAR-derived and contour-derived elevation grids were used, and the grids were processed using both single-directional flow algorithm and bi-directional flow algorithm. The result of these different grids were compared and analyzed in context of their application in defining terrain types for the forest gap model. Refinements were made in the timescale of gap model’s weather model, converting it into a daily weather generator, in order to incorporate the effects of the new topographic/hydrologic input parameter. The precipitation …

Some basic but desirable employability skills are antecedents of job performance. The Workplace Skills Survey (WSS) is a 48-item situational judgment test (SJT) used to assess non-technical workplace skills for both entry-level and experienced workers. Unfortunately, the psychometric evidence for use of its scores is far from adequate. The purpose of current study was two-fold: (a) to examine the proposed structure of WSS scores using confirmatory factor analysis (CFA), and (b) to explore the WSS item functioning and performance using item response theory (IRT). A sample of 1,018 Jamaican unattached youth completed the WSS instrument as part of a longitudinal study on the efficacy of a youth development program in Jamaica. Three CFA models were tested for the construct validity of WSS scores. Parameter estimations of item difficulty, item discrimination, and examinee’s proficiency estimations were obtained with item response theory (IRT) and plotted in item characteristics curves (ICCs) and item information curves (IICs). Results showed that the WSS performed quite well as a whole and provided precise measurement especially for respondents at latent trait levels of -0.5 and +1.5. However, some modifications of some items were recommended. CFA analyses showed supportive evidence of the one-factor construct model, while the six-factor …

Learning of a positive diagnosis of HIV may be one of the most challenging and stressful events in life. The memory of this event is emotionally laden, and even years later evokes an emotional response. Similarly, many people living with HIV (PLH) have memories of the first time they were treated differently because of their diagnosis. While research frequently examines the subjective of stress, few studies have examined biological markers of stress in people living with HIV. Heart Rate Variability offers a non-invasive measure of stress. Beyond serving as a biological marker for stress, changes in HRV are also associated with emotional functioning. Research demonstrates decreased HRV levels in patients with Depression, Anxiety, and PTSD. We conducted a repeated measures MANOVA to examine effects of stress induction on HRV in individuals with high and low levels of HIV-related stigma. We found that the high stigma group was significantly different from the low stigma group in regard to changes in participants’ HRV, Wilks’ λ = .50, F (1, 51) = 11.63, p < .001. A hierarchical linear regression examined the relationship between HRV and other measures of stress (Heart Rate and Blood Pressure). We found that systolic blood pressure and heart …

The purpose of this dissertation was to explore the state of critical information literacy (CIL) in higher education as it is enacted and understood by academic librarians. This qualitative study investigated the institutional support, nonsupport, and barriers to CIL programs and the effectiveness of experiential critical pedagogy for information literacy (IL) learning as taught and studied by 19 CIL specialists. Purposeful sampling was used to gather a sample of 17 academic librarians and two professors of library and information science who had previously worked as academic librarians. The sample included 11 females and eight males; 18 participants were Caucasian and one was African American. Data were collected through 40-60 minute semi-structured interviews and a brief demographic survey. Experiential education served as the broad theoretical framework for this study, which stems from the tradition of critical theory. This study was guided by the work of two major experiential learning theorists and theories: Paulo Freire and critical pedagogy and Jack Mezirow and transformative learning. Mezirow and Freire focused their work on adult education and grounded their approaches in critical theory and focused on power relationships, reflection, and the emancipatory potential of education. The findings were framed through a lens of Freire’s conception …

Performance and reliability of solid state laser diodes in the IR region exceeds those in the visible and UV part of the light spectrum. Single frequency visible and UV laser diodes with higher than 500 mW power are not available commercially. However we successfully stabilized a multi-longitudinal mode IR laser to 860 mW single frequency. This means high efficiency harmonic generation using this laser can produce visible and UV laser light not available otherwise. In this study we examined three major leading nonlinear crystals: PPMgO:SLN, PPKTP and PPMgO:SLT to generate blue light by second harmonic generation. We achieved record high net conversion efficiencies 81.3% using PPMgO:SLT (~500 mW out), and 81.1% using PPKTP (~700 mW out). In both these cases an external resonance buildup cavity was used. We also studied a less complicated single pass waveguide configuration (guided waist size of ~ 5 um compared to ~60 um) to generate blue. With PPMgO:SLN we obtained net 40.4% and using PPKT net 6.8% (110mW and 10.1 mW respectively).

In 1939, during his studies at the Eastman School of Music, John La Montaine (1920-2013) composed a Scherzo for four trombones. The Scherzo was revised more than 60 years later, becoming the third movement of a three-movement trombone quartet completed in 2001. Interestingly, the same Scherzo subsequently appeared in two of his later works: first the final movement of his Piano Concerto No. 4 Op. 59 (1989) and 12 years later as the final movement of a three-movement Trombone Quartet. The thesis presents a detailed account of the compositional history of the Scherzo, its connection to the first two movements, and a performance edition of the Scherzo based on my collaboration with the composer between for five years from 2003 to 2007.

Factors influencing the career development of Asian Americans have included family influences, including parental expectations and parent-young adult relationship, and adherence to Asian cultural values. Variables such as interests and values have been shown to be important factors in the career-related decisions of western, European American culture individuals, although interests have been found to be less important for Asian Americans. Research suggests that parental expectations and adherence to traditional Asian values have more influence on career development among this population. Sandhu found in 2011 that parental expectations are highly linked with career choice of a specific Asian subgroup. The current study examined the relationship between parental expectations, acculturation, career values, adherence to Asian cultural values, the parent-young adult relationship, and career choice in the Asian American population. The values gap between the parents’ and young adults’ cultural values as well as the gap’s effects on the parent-child relationship were assessed. A sample of 173 self-identified Asian Americans aged 18 to 25 were recruited from across the US to complete an Internet survey consisting of demographic questions, career choice questions, a measure of acculturation, an assessment of career-related values, an assessment of adherence to Asian cultural values, and an assessment of …

Professional school counselors frequently use career interest inventories as part of a comprehensive guidance program to help students create a post-secondary school plan. The present study evaluates the validity of three commonly used interest inventories, the Myers-Briggs Type Indicator, Self-Directed Search, and Strong Interest Inventory on field of study choice for graduating high school seniors (N = 616) from a large, suburban high school in Texas. Students identified their intended postsecondary field of study category, were randomly assigned using stratification to three groups, and each group completed a different inventory. Group membership was evaluated to establish covariate balance on a wide variety of indicators. Data from each group was evaluated to determine the extent to which the inventory predicted the chosen field of study, as well as Other and Undeclared categories using logistic regression models. None of the inventory models suggest that the inventory accurately predicts Other or Undeclared outcomes. For students selecting intended postsecondary fields of study, the Self Directed Search predicts such outcomes better than other measures. Professional school and career counselors should consider the SDS in addition to narrative counseling strategies to add greater precision with career decision making among clients and students.

Forensic STR analysis is limited by the quality and quantity of DNA. Significant damage or alteration to the molecular structure of DNA by depurination, crosslinking, base modification, and strand breakage can impact typing success. Two methods that could potentially improve STR typing of challenged samples were explored: an in vitro DNA repair assay (PreCR™ Repair Mix) and whole genome amplification. Results with the repair assay showed trends of improved performance of STR profiling of bleach-damaged DNA. However, the repair assay did not improve DNA profiles from environmentally-damaged bloodstains or bone, and in some cases resulted in lower RFU values for STR alleles. The extensive spectrum of DNA damage and myriad combinations of lesions that can be present in forensic samples appears to pose a challenge for the in vitro PreCR™ assay. The data suggest that the use of PreCR™ in casework should be considered with caution due to the assay’s varied results. As an alternative to repair, whole genome amplification (WGA) was pursued. The DOP-PCR method was selected for WGA because of initial primer design and greater efficacy for amplifying degraded samples. Several modifications of the original DOP-PCR primer were evaluated. These modifications allowed for an overall more robust amplification …

The purpose of this study was to examine the factorial validity and measurement equivalence of the Test of Performance Strategies (TOPS; Thomas, Murphy, & Hardy, 1999); the Sport Anxiety Scale (SAS; Smith, Smoll, & Schultz, 1990); and the Golf Performance Survey (GPS; Thomas & Over, 1994) across age groups in a representative sample of amateur golfers. Based on archival data, participants comprising this study were 649 younger adult (n = 237) and older adult (n = 412) amateur golfers who played in the Dupont World Amateur Golf Championship in Myrtle Beach, South Carolina. The participants completed a set of questionnaires including psychological skills and strategies (e.g., self-talk, goal setting, imagery, etc.) used during competition, sport-specific competitive trait anxiety, and psychomotor skills and involvement in golf. Results demonstrated that the original factor structure of the TOPS competition subscale, the SAS, and the GPS, did not adequately fit the data among this sample of younger and older adult amateur golfers. Further exploratory and confirmatory factor analyses established evidence of factorial validity with the TOPS competition subscale, SAS, and the GPS with both younger and older adult amateur golfers. Configural, metric, scalar, and strict measurement invariance were identified in relation to the TOPS …

This study uses the ACS first-term general chemistry exam to determine if one curriculum approach is more effective in increasing student success than the other based on their performance on the ACS exam. Two chemistry curriculum approaches were evaluated in this study; the traditional curriculum (TC) and the Atoms First (AF) approach. The sample population was first-semester general chemistry students at Collin College in Frisco, TX. An independent sample t-test was used to determine if there were differences in overall performance between the two curriculum approaches on two different versions of the ACS exam. The results from this study show that AF approach may be a better alternative to the TC approach as they performed statistically significantly better on the 2005 exam version. Factor analysis was used to determine if there were differences between the two curriculum approaches by topic on the ACS exam. Eight different topics were chosen based on topics listed on the ACS Examinations Institute Website. The AF students performed better at a statistically significant level than the TC students on the topics of descriptive chemistry and periodicity, molecular structure, and stoichiometry. Item response theory was used to determine the chemistry content misconceptions held by the students …

In January 1989, a much-rumored work by Dmitri Shostakovich titled Anti-Formalist Rayok received its public premiere. Rayok is a single-act satirical opera/cantata for bass soloist and mixed chorus. Each character represents a prominent Soviet political figure: Joseph Stalin, Andrei Zhdanov, and Dmitri Shepilov. The text of the libretto is either taken directly from actual speeches given by these political figures or follows their idiosyncratic style of public speaking. Rayok often falls victim to criticism for its lack of musical depth, a point of view that could easily lead one to see it as one of Shostakovich's lesser works. The purpose of this document is to examine the political environment of the Soviet Union in the early twentieth century in order to provide context for Shostakovich's Anti-Formalist Rayok and to show how Shostakovich uses satire in this piece. This dissertation document looks at the broader concepts of Formalism and Socialist Realism, traces how Socialist Realism became the established Soviet cultural aesthetic, and examines specific historical events in the 1940s and 1950s that relate to Rayok. Musical examples are taken from the section of the piece centering around D.T. Troikin. These examples demonstrate how Shostakovich uses Socialist Realist clichés in order to …

A series of 28 square-planar dithiol(diimine)platinum(II) chromophoric complexes have been synthesized, characterized, and evaluated for potential efficacy in sensitization of solid state photovoltaic devices to the near-infrared regions of the electromagnetic spectrum. The effect of molecular stacking in the solid state and self-association in solution are shown to influence spectral, electronic, and magnetic properties of the chromophores. Such properties are investigated in the pure form and as partners in donor-acceptor charge transfer adducts. Finally, selected chromophores have been incorporated into single layer schottky diodes as neat films and as dopants in multi-layer organic photovoltaic devices. Evaluation of the devices internal quantum efficiency and voltage-current was measured as proof of concept.

In Ghoera, Afrika-verse vir kinders, poet Hennie Aucamp demonstrates an affiliation with and reflection of his surroundings, such as the tribal communities he experienced as a child. This group of African children’s poems, published by Protea Boekhuis in 2011, became the source of inspiration for composer Niel van der Watt’s song cycle Die wind dreun soos ‘n ghoera, ‘n Siklus Boesman-mites. This study investigates and identifies significant compositional traits that contributed to van der Watt’s song cycle. To explore and understand the nature of such influences, the second chapter considers the composer’s early childhood; religious world views; student life; social, environmental, and political ideas; personal tonal language; and western musical elements. To ascertain possible indigenous Bushmen musical elements in van der Watt’s song cycle, the third chapter traces the history of the Bushmen and their marginalization, followed by a brief survey of historical writings on Bushmen music, and an identification process utilizing musicologist Percival R. Kirby’s research on Bushmen music as a foundation. The fourth chapter explores the origins of the cycle and other significant compositional influences. This study suggests that Hennie Aucamp’s poetry and Niel van der Watt’s song cycle represent a reconciling vehicle for cross-cultural understanding generating awareness …

The purpose of this study is to examine the work life balance negotiations of three distinct culture groups employed by South Korean conglomerates located within the southeastern United States. These three cultural groups are: Korean nationals, Korean Americans, and non-Korean Americans. It is proposed that each culture will negotiate work life balances in their own manner based upon their specific inherent cultural understandings. This study is a cross-cultural examination through thirty-two open-ended interviews of employees working for large multinational Korean companies with facilities in the southern United States. Korean nationals, Korean Americans, and Americans implement different work-life balance negotiation tactics in the workplace based upon each one’s cultural association. While all three cultural groups experience difficulty in obtaining a work-life balance working for a Korean company, the Korean Americans seem to suffer the most.

My dissertation investigates Thucydides’ presentation of Sparta. By viewing the war through Sparta, one is confronted with debates on the moral dimensions of war. Sparta decries the imperialism of Athens as unjust and while the Athenians imply that such claims are merely Spartan ‘hypocrisy’ and therefore that Sparta does not truly take justice seriously, my study contends that the Spartan concern with justice and piety is genuine. While the Athenians present a sophisticated and enlightened view of what they believe guides all political actions (a view most scholars treat as Thucydides’ own) my study argues that Sparta raises problems for key arguments of the ‘Athenian thesis.’ Through a closer study of Thucydides’ Sparta, including his neglected Book 5, I locate details of both Sparta’s prosecution of the war and their regime that must be considered before agreeing with the apparent sobriety and clear-sightedness of the Athenians, thus leading the reader into the heart of Thucydides’ view of morality in both foreign affairs and domestic politics. A portion of this research is currently being prepared as an article-length study on the broad and important issue of hypocrisy in foreign affairs among states.

Enterprise content management (ECM) is an emerging research area that is beginning to find attention in academia. While the private sector has a growing industry and community for ECM, academia is starting to address this with direct links to the better-established areas of information systems and enterprise resource planning systems. ECM has been viewed as a higher-level concept of methods and strategies pertaining to content management in the context of the enterprise. Like many other organizational wide systems, ECM systems are complex, difficult to implement and risk failing to meet expected success measures. Definitions for what exactly constitutes an ECM system are still evolving. The major issues with ECM systems are that they are increasingly being implemented by organizations in an attempt to address the unmanageable amount of unstructured content over its lifecycle, compliance pressures, collaboration needs, content integrity and continuity, and controlling costs. However, the implementation problems are many and diverse, such as determining content and business processes to be included, determining technologies to fit the organizational needs, how to integrate with existing systems, and managing organizational culture and change for acceptance. There is currently little academic research in the area of ECM, and research determining the key factors …

The effects of octadecylamine-functionalized reduced graphene oxide (FRGO) on the frictional and wear properties of diglycidylether of bisphenol-A (DGEBA) epoxy are studied using a pin-on-disk tribometer. It was observed that the addition of FRGO significantly improves the tribological, mechanical, and thermal properties of epoxy matrix. Graphene oxide (GO) was functionalized with octadecylamine (ODA), and then reduction of oxygen-containing functional groups was carried out using hydrazine monohydrate. The Raman and x-ray photoelectron spectroscopy studies confirm significant reduction in oxygen-containing functional groups and formation of ODA functionalized reduced GO. The nanocomposites are prepared by adding 0.1, 0.2, 0.5 and 1.0 wt % of FRGO to the epoxy. The addition of FRGO increases by more than an order of magnitude the sliding distance during which the dynamic friction is ≤ 0.1. After this distance, the friction sharply increases to the range of 0.4 - 0.5. We explain the increase in sliding distance during which the friction is low by formation of a transfer film from the nanocomposite to the counterface. The wear rates in the low and high friction regimes are approximately 1.5 x 10-4 mm3/N·m and 5.5 x 10-4 mm3/N·m, respectively. The nanocomposites exhibit a 74 % increase in Young’s modulus with …

Past research indicates that self-compassion has positive implications for psychological health and functioning. However, as a newly specified construct, the literature regarding self-compassion could benefit from a more thorough validation of the primary scale used in this area of research, the Self-Compassion Scale. In the present study, structural path analysis (using Amos) was used to explore the criterion validity of the SCS with four variables which have been theorized to be relevant to self-compassion (caregiver emotional responsiveness, fear of emotion, internalized spirituality, and achievement goal orientation). Initial hypothesis testing indicated support for the path model, with the exception of achievement goals which were not significantly associated with self-compassion. Trimming these paths in a subsequent analysis improved model fit. Interestingly, further analyses of the model indicated that the pairing of participant and parent gender produced substantial differences in path coefficients. Next, correlational and factor analytic methods were used to test the construct validity of the SCS. Correlational analyses found adequate convergent construct validity but some lack of divergent validity between SCS dimensions and conceptually similar constructs (i.e., fear of emotion, social connectedness and self-criticism). Confirmatory factor analysis indicated that a two-factor model fit the data better than the one-factor model proposed …

The purpose of this quantitative study was to examine undergraduate military veteran students’ self-determination and academic effort in relation to their nonveteran college peers. A total of 734 undergraduates attending 4-year institutions in Texas completed a survey, including: 76 veterans (63% males, 37% females); and 658 non-veterans (26% males, 74% females). This research created a more holistic survey of self-determination by adding the 8-item New General Self-Efficacy Scale to the 10-item Self-determination Scale. The survey also included 13-items drawn from the National Survey of Student Engagement. A factor analysis with a varimax rotation of the items identified six factors: competence, autonomy, relatedness, reflection, learning strategies, and quantitative reasoning resulting in a significant Bartlett’s test of sphericity (2 (465) = 12324.53, p < .001). The first hierarchical ordinary least squares (HOLS) analysis results showed that undergraduate veteran students have statistically significant higher levels of self-determination than students without military experience with a small effect size (R2 = .022%, p < .001); however, a meta-analysis of self-determination revealed a large effect size of d = 1.33 between veterans (M = .81, SD = .12) and freshmen undergraduates (M = .65, SD = .12). The second HOLS analysis revealed that self-determination is a …

This study design was to identify and examine how disaster experience, self-efficacy, and demographic factors influence disaster preparedness in community-dwelling older adults. Current data indicates the United States is rapidly aging. Parallel to this significant increase among the elderly population, natural disasters are more prevalent. Consequently, older adults are affected adversely by these disasters and exposure to social vulnerabilities during the disaster cycle. For the purpose of this study, non-identifiable secondary data were analyzed. Sources of the data were the 2007 and 2008 National Center for Disaster Preparedness surveys. The sample focus of this study was adults 50 and older. Regression analyses identified important predictors of disaster preparedness in the survey respondents. Sample adults with previous disaster experience are two times more likely to be in a higher category for having an emergency plan than those respondents with no observable effects of self-efficacy and no previous disaster experience. The frequency of natural disasters in the United States has generated a renewed interest in disaster management, in particular, disaster preparedness. Nevertheless, the focal point of disaster preparedness is no longer the rudimentary stockpile of water, a first aid kit, and a battery operated radio. To advance the field of disaster management …

Very few Latin American pieces for trombone as a solo instrument have entered the canon of trombone repertoire worldwide, despite the large number of compositions in this medium. Therefore, when a major composer writes a full sonata for trombone efforts need to be made to bring these compositions to light. The Argentine composer Carlos Guastavino wrote a sonata for trombone and piano that is virtually unknown outside of Argentina, despite the composer’s importance. He is known for his artistic choice of cultivating a traditional romantic style of composition apart from the new tendencies and influences of the artistic novelties of the twentieth century. Guastavino’s artistic position is very clear in the sonata’s highly strict formal organization and Guastavino’s unique treatment of tonality and modality. He was also loyal to his own style as composer, which is ultimately an Argentine song style. He utilized the lyrical qualities of the trombone to convey the type of melodic approach that he used in his vocal works. This paper investigates the Argentine song and Western sonata conventions featured on Carlos Guastavino’s Sonata para Trombón o Trompa y Piano. The paper argues that these features represent his unique approach to musical composition in the twentieth …

The increasing technological need to push service conditions of structural materials to higher temperatures has motivated the development of several alloy systems. Among them, superalloys are an excellent candidate for high temperature applications because of their ability to form coherent ordered precipitates, which enable the retention of high strength close to their melting temperature. The accelerated kinetics of solute diffusion, with or without an added component of mechanical stress, leads to coarsening of the precipitates, and results in microstructural degradation, limiting the durability of the materials. Hence, the coarsening of precipitates has been a classical research problem for these alloys in service. The prolonged hunt for an alternative of nickel base superalloys with superior traits has gained hope after the recent discovery of Co-Al-W based alloys, which readily form high temperature g precipitates, similar to Ni base superalloys. In the present study, coarsening behavior of g precipitates in Co-10Al-10W (at. %) has been carried out at 800°C and 900°C. This study has, for the first time, obtained critical coarsening parameters in cobalt-base alloys. Apart from this, it has incorporated atomic scale compositional information across the g/g interfaces into classical Cahn-Hilliard model for a better model of coarsening kinetics. The coarsening …

Researchers have previously identified substance use and borderline personality disorder as factors that increase risk for suicidal thoughts and behaviors. This study explored the relationship between these factors in samples of students and individuals seeking outpatient treatment. Supplemental data collected via the internet (MTurk) also looked at experiential avoidance (EA) with the Avoidance and Fusion Questionnaire for Youth. The Structured Clinical Interview for the DSM-IV, Alcohol Use Disorders Identification Test, Scale for Suicide Ideation, and Personality Assessment Inventory- Borderline Features Scale elicited information regarding severity and/or frequency of substance use, suicidal thoughts, and borderline features respectively. Additionally, the Psychiatric Diagnostic Screening Questionnaire was administered to the UNT sample. The UNT sample analyses indicate substance use moderates, strengthening, the relationship between borderline features and current suicidal thoughts. However, severity of suicidal thoughts was lower for individuals high in both borderline features and substance use disorder symptoms compared to those low in borderline features and high in substance use symptoms. The MTurk sample analyses suggest substance use functions as a mediator. A robust relationship existed between substance use severity and EA, showing substance use as a behavioral marker for EA. In conclusion, concurrent treatment of substance use and borderline personality features would …