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Microwave-Assisted Synthesis, Characterization, and Photophysical Properties of New Rhenium(I) Pyrazolyl-Triazine Complexes

Microwave-Assisted Synthesis, Characterization, and Photophysical Properties of New Rhenium(I) Pyrazolyl-Triazine Complexes

Date: May 2010
Creator: Salazar Garza, Gustavo Adolfo
Description: The reaction of the chelating ligand 4-[4,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazin-2-yl]-N,N-diethyl-benzenamine, L, with pentacarbonylchlororhenium by conventional heating method produces the complexes fac-[ReL(CO)3Cl2] and fac-[Re2L(CO)6Cl2] in a period of 48 hours. The use of microwaves as the source of heat and the increase in the equivalents of one of the reactants leads to a more selective reaction and also decreases the reaction time to 1 hour. After proper purification, the photophysical properties of fac-[ReL(CO)3Cl] were analyzed. The solid-state photoluminescence analysis showed an emission band at 628 nm independent of temperature. However, in the solution studies, the emission band shifted from 550 nm in frozen media to 610 nm when the matrix became fluid. These results confirm that this complex possess a phenomenon known as rigidochromism.
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Social, Demographic, and Institutional Effects on African American Graduation Rates in U.S. Colleges and Universities.

Social, Demographic, and Institutional Effects on African American Graduation Rates in U.S. Colleges and Universities.

Date: May 2010
Creator: Wright, LaQueta L.
Description: Improving the retention and graduation of African Americans and other minority groups in higher education is an important but highly politicized issue on college and university campuses. Prior studies emphasize the relationship between minority retention and achievement, cultural diversity, and racial policies and climates at predominantly White colleges and universities in the United States. In response to the need for further research, the effects of institutional actions related to diversity, minority group and African American retention, and social integration initiatives on African American graduation rates were examined for a national sample of United States (U.S.) colleges and universities. From a potential list of 7,018 colleges and universities, 2,233 met the inclusion criteria for the study. But necessary and complete information from national directories and the census could only be found for the final sample of 1,105. After dropping 30 outliers, several multiple regression analyses identified the institutional actions, social, and demographic factors that best predicted graduation rates. Public U.S. colleges and universities located in the Midwest region had lower African American graduation rates than private colleges and universities located in the South. Higher African American graduation rates occurred in colleges and universities with Black cultural centers, higher first-year retention rates, ...
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Student Engagement Theory: A Comparison of Jesuit, Catholic, and Christian Universities

Student Engagement Theory: A Comparison of Jesuit, Catholic, and Christian Universities

Date: May 2010
Creator: Williamson, Robin Marie
Description: This research study analyzed the results of the Jesuit Universities Consortium in comparison with the results of the Catholic Colleges and Universities and the Council for Christian Colleges Consortia as measured by the 2005 National Survey of Student Engagement (NSSE) in order to determine and identify any statistically significant differences between the consortia. One-way ANOVA analyses and Tukey HSD post hoc comparisons were conducted on the data from freshmen/first year students and seniors/fourth year students on each of the five clusters of the NSSE to determine any statistically significant difference and, subsequently, the effect size of any found differences. The study found that there were statistically significant differences on the following: 1) freshmen/first year students in the Jesuit Universities Consortium and the freshmen/first year students in the Council for Christian Colleges and Universities Consortium on the NSSE cluster of Academic Challenge, 2) freshmen/first year students in the Jesuit Universities Consortium and the freshmen/first year students in the Catholic Colleges and Universities Consortium on the NSSE cluster of Enriching Educational Experiences, 3) freshmen/first year students in the Jesuit Universities Consortium and the freshmen/first year students in the Council for Christian Colleges and Universities Consortium on the NSSE cluster of Supportive Campus ...
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Does the Provision of an Intensive and Highly Focused Indirect Corrective Feedback Lead to Accuracy?

Does the Provision of an Intensive and Highly Focused Indirect Corrective Feedback Lead to Accuracy?

Date: May 2010
Creator: Jhowry, Kheerani
Description: This thesis imparts the outcomes of a seven-week long quasi-experimental study that explored whether or not L2 learners who received intensive and highly focused indirect feedback on one type of treatable error - either the third person singular -s, plural endings -s, or definite article the - eventually become more accurate in the post-test as compared to a control group that did not. The paired-samples t-test comparing the pre-test and post-test scores of both groups demonstrates that the experimental group did no better than the control group after they received indirect corrective feedback. The independent samples t-test measuring the experimental and control group's accuracy shows no significant difference between the two groups. Effect sizes calculated, however, do indicate that, had the sample sizes been bigger, both groups would have eventually become more accurate in the errors targeted, although this would not have been because of the indirect feedback.
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"Being" a Stickist:  A Phenomenological Consideration of "Dwelling" in a Virtual Music Scene

"Being" a Stickist: A Phenomenological Consideration of "Dwelling" in a Virtual Music Scene

Date: May 2010
Creator: Hodges, Jeff
Description: Musical instruments are not static, unchanging objects. They are, instead, things that materially evolve in symmetry with human practices. Alterations to an instrument's design often attend to its ergonomic or expressive capacity, but sometimes an innovator causes an entirely new instrument to arise. One such instrument is the Chapman Stick. This instrument's history is closely intertwined with global currents that have evolved into virtual, online scenes. Virtuality obfuscates embodiment, but the Stick's world, like any instrument's, is optimally related in intercorporeal exchanges. Stickists circumvent real and virtual obstacles to engage the Stick world. Using an organology informed by the work of Heidegger and Merleau-Ponty, this study examines how the Chapman Stick, as a material "thing," speaks in and through a virtual, representational environment.
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Post-Civil War Democratization: Domestic and International Factors in Movement Toward and Away from Democracy

Post-Civil War Democratization: Domestic and International Factors in Movement Toward and Away from Democracy

Date: May 2010
Creator: Joshi, Madhav
Description: Post-civil war democratization is a critical element of building sustainable peace in the post-civil war states. At the same time, studies of democratic transition and survival suggest that the post-civil war environment is not hospitable to either the transition to or survival of democracy. The post-civil war environment is contentious. Former protagonists are fearful about their security and at the same time they want to protect their political and economic interests. The central argument of this study is that former rivals can agree to a transition toward democracy to the extent that a stable balance of power exists between the government and rebel groups, a balance that eliminates the sort of security dilemma that would encourage one or both to resume armed conflict. And the balance should ensure access to political power and economic resources. This study identifies factors that contribute to the establishment of such a balance of power between former protagonists and factors that affects its stability. These factors should affect the decision of former protagonists on whether or not they can achieve their political and economic interests if they agree to a transition toward democracy once civil war ends. Factors that are conducive to a transition toward ...
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Confronting Convergence:  Are Higher Education Administrators Using a Strategic Planning Approach to Mass Communication Curriculum Convergence?

Confronting Convergence: Are Higher Education Administrators Using a Strategic Planning Approach to Mass Communication Curriculum Convergence?

Date: May 2010
Creator: Huckeba, Kristyn L.
Description: Professors in mass communications departments of higher education institutions continue to search for the best way to prepare graduates for the ever-changing world of print, broadcast, and online media. Business administration theories have long been used in other areas, including education. While some application of strategic planning has been documented with regards to education, there is not much to reference in this area. The study investigated the use of strategic planning in developing a course of action for curriculum convergence in mass communication programs. The study used a purposive sample to determine if administrators are utilizing this method as a part of curriculum convergence. The results indicated a use of this method among institutions involved in curriculum convergence.
Contributing Partner: UNT Libraries
Jeans, Boots, and Starry Skies: Tales of a Gay Country-and-Western Bar and Places Nearby

Jeans, Boots, and Starry Skies: Tales of a Gay Country-and-Western Bar and Places Nearby

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Date: May 2010
Creator: Gay, Wayne Lee
Description: Fourteen short stories, with five interspersed vignettes, describe the lives of gay people in the southwestern United States, centered around a fictional gay country-and-western bar in Dallas and a small town in Oklahoma. Various characters, themes, and trajectories recur in the manner of a short story cycle, as explained in the prefatory Critical Analysis, which focuses on exemplary works of James Joyce, Ernest Hemingway, William Faulkner, Shirley Jackson, Italo Calvino, Yevgeny Kharitonov, and Louise Erdrich.
Contributing Partner: UNT Libraries
Effect of fluorine and hydrogen radical species on modified oxidized Ni(Pt)Si

Effect of fluorine and hydrogen radical species on modified oxidized Ni(Pt)Si

Date: May 2010
Creator: Gaddam, Sneha Sen
Description: NiSi is an attractive material in the production of CMOS devices. The problem with the utilization of NiSi, is that there is no proper method of cleaning the oxide on the surface. Sputtering is the most common method used for the cleaning, but it has its own complications. Dry cleaning methods include the reactions with radicals and these processes are not well understood and are the focus of the project. Dissociated NF3 and NH3 were used as an alternative and XPS is the technique to analyze the reactions of atomic fluorine and nitrogen with the oxide on the surface. A thermal cracker was used to dissociate the NF3 and NH3 into NFx+F and NHx+H. There was a formation of a NiF2 layer on top of the oxide and there was no evidence of nitrogen on the surface indicating that the fluorine and hydrogen are the reacting species. XPS spectra, however, indicate that the substrate SiO2 layer is not removed by the dissociated NF3 and NiF2 growth process. The NiF2 over layer can be reduced to metallic Ni by reacting with dissociated NH3 at room temperature. The atomic hydrogen from dissociated ammonia reduces the NiF2 but it was determined that the ...
Contributing Partner: UNT Libraries
Comparison of Heteranthera Dubia (Jacq.) MacM.-associated Macroinvertebrates Between Georgraphical Regions in the United States

Comparison of Heteranthera Dubia (Jacq.) MacM.-associated Macroinvertebrates Between Georgraphical Regions in the United States

Date: May 2010
Creator: Harms, Nathan Earl
Description: Macroinvertebrates associated with the aquatic plant, water stargrass (Heteranthera dubia), were sampled from 12 waterbodies in four regions of the United States from June to August 2005. Taxa richness, evenness, and diversity were lowest in the Lower Midwest (LMW) region, and higher in Northern sites, especially the Upper Midwest (UMW), and Northeast (NE). While relative abundance varied from site to site and region to region, utilization of the plant by functional groups remained fairly constant. Collector-gatherers consistently comprised the largest portion of invertebrates sampled. The shredder/ herbivore functional group comprised an average of 17 % of total groups. Through an exhaustive literature review, it was found that shredder/ herbivores of water stargrass have not been reported in the literature. Because of this, the herbivore group was analyzed separately and consisted of 2,383 specimens representing 23 species. The most common groups were Rhopalosiphum sp., Nectopsyche spp. and chironomids. No differences were found in herbivore diversity or evenness between sampling regions, but species richness was significantly different.
Contributing Partner: UNT Libraries