You limited your search to:

  Partner: UNT Libraries
 Degree Level: Doctoral
Customizable Modality Pathway Learning Design: Exploring Personalized Learning Choices through a Lens of Self-Regulated Learning
Open online courses provide a unique opportunity to examine learner preferences in an environment that removes several pressures associated with traditional learning. This mixed methods study sought to examine the pathways that learners will create for themselves when given the choice between an instructor-directed modality and learner-directed modality. Study participants were first examined based on their levels of self-regulated learning. Follow-up qualitative interviews were conducted to examine the choices that participants made, the impact of the course design on those choices, and what role self-regulation played in the process. The resulting analysis revealed that participants desired an overall learning experience that was tailored to personal learning preferences, but that technical and design limitations can create barriers in the learning experience. The results from this research can help shape future instructional design efforts that wish to increase learner agency and choice in the educational process.
A Search for Periodic and Quasi-Periodic Patterns in Select Proxy Data with a Goal to Understanding Temperature Variation
In this work over 200 temperature proxy data sets have been analyzed to determine if periodic and or quasi-periodic patterns exist in the data sets. References to the journal articles where data are recorded are provided. Chapter 1 serves an introduction to the problem of temperature determination in providing information on how various proxy data sources are derived. Examples are given of the techniques followed in producing proxy data that predict temperature for each method used. In chapter 2 temperature proxy data spanning the last 4000 years, from 2,000 BCE to 2,000 CE, are analyzed to determine if overarching patterns exist in proxy data sets. An average of over 100 proxy data sets was used to produce Figure 4. An overview of the data shows that several “peaks” can be identified. The data were then subjected to analysis using a series of frequency modulated cosine waves. This analysis led to a function that can be expressed by equation 3. The literature was examined to determine what mathematical models had been published to fit the experimental proxy data for temperature. A number of attempts have been made to fit data from limited data sets with some degree of success. Some other papers have used a sinusoidal function to best fit the changes in the temperature. After consideration of many published papers and reviewing long time streams of proxy data that appeared to have sine wave patterns, a new model was proposed for trial. As the patterns observed showed “almost” repeating sine cycles, a frequency modulated sine wave was chosen to obtain a best fit function. Although other papers have used a sinusoidal function to best fit the changes in the temperature, the “best fit” was limited. Thus, it was decided that a frequency modulated sine wave may be a better model that would provide a more precise fit. This proved to be the case and the more than 240 temperature proxy data sets were analyzed using Equation 3. In chapter 3 the time span for the proxy data was extended to cover the period of time 12,000 BCE to 2000 CE. The data were then tested by using the equation above to search for periodic/quasi-periodic patterns. These results are summarized under select conditions of time periods. In chapter 4 the interval of time is extended over 1,000,000 years of time to test for long period “periodic” changes in global temperature. These results are provided for overall analysis. The function f(x) as described above was used to test for periodic/quasi-periodic changes in the data. Chapter 5 provides an analysis of temperature proxy data for an interval of time of 3,000,000 years to establish how global temperature has varied during the last three million years. Some long-term quasi-periodic patterns are identified. Chapter 6 provides a summation of the model proposed for global temperature that can be expected if similar trends continue over future years as have prevailed for the past few million years. Data sets that were used in this work are tabulated in the appendices of this paper.
Strategic Design: An Action Research Study on Community Relations in a Texas School District
School leaders often contemplate implementing measures that will increase community and parent involvement in schools. There is a shortage of research that concisely takes school leadership through a process that details how to integrate parent and community input in a school transformation initiative and careful analysis of student outcomes. Within this study, I provide an in-depth look at one school district’s efforts to engage its community through strategic planning and mission and vision redesign. This process includes community involvement at every phase. For the purpose of this study, community refers to both community members who do not have children in the school system and parents of current students. In this study, I outline the inception of the transformation effort, the ongoing efforts to include community input in decision-making and campus implementation, and finally a review of the overarching impact on leadership, staff, students and community. Data collection analyzed in this study include assessment data, survey data, discipline data and walk through data collected by the school district.
Biomass-Derived Activated Carbon through Self-Activation Process
Access: Use of this item is restricted to the UNT Community.
Self-activation is a process that takes advantage of the gases emitted from the pyrolysis process of biomass to activate the converted carbon. The pyrolytic gases from the biomass contain CO2 and H2O, which can be used as activating agents. As two common methods, both of physical activation using CO2 and chemical activation using ZnCl2 introduce additional gas (CO2) or chemical (ZnCl2), in which the CO2 emission from the activation process or the zinc compound removal by acid from the follow-up process will cause environmental concerns. In comparison with these conventional activation processes, the self-activation process could avoid the cost of activating agents and is more environmentally friendly, since the exhaust gases (CO and H2) can be used as fuel or feedstock for the further synthesis in methanol production. In this research, many types of biomass were successfully converted into activated carbon through the self-activation process. An activation model was developed to describe the changes of specific surface area and pore volume during the activation. The relationships between the activating temperature, dwelling time, yield, specific surface area, and specific pore volume were detailed investigated. The highest specific surface area and pore volume of the biomass-derived activated carbon through the self-activation process were up to 2738 m2 g-1 and 2.209 cm3 g-1, respectively. Moreover, the applications of the activated carbons from the self-activation process have been studied, including lithium-ion battery (LIB) manufacturing, water cleaning, oil absorption, and electromagnetic interference (EMI) shielding.
The Perceptions of Policymakers on the Transfer Pathway in Texas Public Higher Education
Community college students transfer to public universities experiencing a pathway filled with complexity and inequity. Transfer students are not able to graduate at the same pace as native students at the university and complete their baccalaureate degrees 18% below the rate of native students. Policymakers have attempted to address the baccalaureate gap. This qualitative study explored the perspectives of Texas policymakers and policy influencers on the efficacy of policies intended to improve transfer outcomes. This study investigated what experience participants have with transfer policy, what their perceptions of the transfer pathway are, and how their voices can refine an understanding of policy development and ways to improve student persistence. Purposeful sampling was used to explore the perspectives of 14 Texas policymakers and those that influence policy. Findings revealed that significant gaps exist between expectations and student realities and that the completion agenda is driving policy decisions. Participants perceived that transfer students have been ignored in the completion metrics, which influence institutional priorities. Moreover, the decentralized system of independent, autonomous institutions is a major contributor to inefficiencies such as excessive student credit hours. Improving the transferability of courses was a priority recommendation of all participants both because it benefits the State’s economy and, more importantly, because it is in the best interest of students.
Design of New Monodentate Ligands for Regioselectivity and Enantioselectivity Tuning in Late Transition Metal Catalysis
Access: Use of this item is restricted to the UNT Community.
The ability of gold(I) to activate many types of unsaturated bonds toward nucleophilic attack was not widely recognized until the early 2000s. One major challenge in gold catalysis is the control over regioselectivity when there are two or more possible products as a result of complicated mechanistic pathways. It is well know that the choice of ligand can have dramatic effects on which pathway is being followed but very rarely are the reasons for this selectivity understood. The synthesis of new acyclic diaminocarbenes was developed and a study of the ligand effects on the regioselectivity of a gold-catalyzed domino enyne cyclization hydroarylation reaction and a Nazarov cyclization was undertaken. New chiral acyclic diaminocarbenes were also developed and tested along side new C3-symmetric phosphite ligands in an asymmetric intramolecular hydroamination of allenes. Structure activity correlations were developed for the potential use in further rational ligand design. The synthesis of 6a,7-dihydro-5-amino-dibenzo[c,g]chromene derivatives via a gold-catalyzed domino reaction of alkynylbenzaldehydes in the presence of secondary amines was developed. These were sent to be screened for biological activity.
The Controversial Identity of Flamenco Jazz: A New Historical and Analytical Approach
There are certain recordings by important artists such as Lionel Hampton, Miles Davis, John Coltrane, Pedro Iturralde, Chick Corea, and Paco de Lucía, among others, that have been associated with the label flamenco jazz. This label is entering jazz discourse, and it needs to be better understood in order to clarify its history, its identity, and its impact on recent developments in flamenco that are labeled nuevo flamenco. There is a lack of agreement in the existent literature on flamenco jazz on the evaluation of these recordings and these artists' achievements and contributions to this field. These writings encompass authors from different backgrounds: journalists, critics, and musicologists, who have approached their analysis of the recordings from different perspectives. The differences in professional backgrounds, approaches, and purpose of the writings of these authors has resulted in controversy about this label. Therefore, the flamenco jazz scholarly conversation needs more objective writings from an analytical point of view. This historiographical study presents a more comprehensive evaluation of flamenco jazz by discussing selected recordings using analytical tools from jazz studies. These analytical arguments clarify the aesthetics of flamenco jazz and the artistic processes that these artists went through when combining musical elements from flamenco and jazz, which in some cases are described as creative misreading. In this century of cultural globalization, where jazz has become a diverse expression of world music because of its capacity to absorb traits from other musical practices, this study can be a resource for international jazz musicians who are seeking to combine jazz with their musical cultural heritage.
Influence of High Strain Rate Compression on Microstructure and Phase Transformation of NiTi Shape Memory Alloys
Since NiTi shape memory alloy (SMA) was discovered in the early 1960s, great progress has been made in understanding the properties and mechanisms of NiTi SMA and in developing associated products. For several decades, most of the scientific research and industrial interests on NiTi SMA has focused on its superelastic applications in the biomedical field and shape memory based “smart” devices, which involves the low strain rate (around 0.001 s^-1) response of NiTi SMA. Due to either stress-induced martensite phase transformation or stress induced martensite variant reorientation under the applied load, NiTi SMA has exhibited a high damping capacity in both austenitic and martensitic phase. Recently, there has been an increasing interest in exploitation of the high damping capacity of NiTi SMA to develop high strain rate related applications such as seismic damping elements and energy absorbing devices. However, a systematic study on the influence of strain, strain rate and temperature on the mechanical properties, phase transformation, microstructure and crystal structure is still limited, which leads to the difficulties in the design of products being subjected to high strain rate loading conditions. The four main objectives of the current research are: (1) achieve the single loading and the control of strain, constant strain rate and temperature in high strain rate compression tests of NiTi SMA specimens using Kolsky (split Hopkinson) compression bar; (2) explore the high strain rate compressive responses of NiTi SMA specimens as a function of strain (1.4%, 1.8%, 3.0%, 4.8%, and 9.6%), strain rate (400, 800 and 1200 s^-1), and temperature (room temperature (294 K) and 373 K); (3) characterize and compare the microstructure, phase transformation and crystal structure of NiTi SMAs before and after high strain rate compression; and (4) correlate high strain rate deformation with the changes of microstructure, phase transformation characteristics and crystal structure. Based on the results from this study, it was found that: (1) the compressive stress strain curves of martensitic NiTi SMAs under quasi-static loading conditions are different from those under high strain rate loading conditions, where higher strain hardening was observed; (2) the critical stress and stress plateau of martensitic NiTi SMAs are sensitive to the strain rate and temperature, especially at 373K, which results from the interplay between strain hardening and thermal softening; (3) the microstructure of martensitic NiTi SMA has changed with increasing strain rate at room temperature (294 K), resulting in the reduction in the area of ordered martensite region, while that area increases after deformation at elevated temperature (373K); (4) the phase transformation characteristic temperatures are more sensitive to deformation strain than strain rate; (5) the preferred crystal plane of martensitic NiTi SMA has changed from (11 ̅1)M before compression to (111)M after compression at room temperature (294 K), while the preferred plane remains exactly the same for martensitic NiTi SMA before and after compression at 373 K. Lastly, dynamic recovery and recrystallization are also observed after deformation of martensitic NiTi SMA at 373K.
Information Structures in Notated Music: Statistical Explorations of Composers' Performance Marks in Solo Piano Scores
Written notation has a long history in many musical traditions and has been particularly important in the composition and performance of Western art music. This study adopted the conceptual view that a musical score consists of two coordinated but separate communication channels: the musical text and a collection of composer-selected performance marks that serve as an interpretive gloss on that text. Structurally, these channels are defined by largely disjoint vocabularies of symbols and words. While the sound structures represented by musical texts are well studied in music theory and analysis, the stylistic patterns of performance marks and how they acquire contextual meaning in performance is an area with fewer theoretical foundations. This quantitative research explored the possibility that composers exhibit recurring patterns in their use of performance marks. Seventeen solo piano sonatas written between 1798 and 1913 by five major composers were analyzed from modern editions by tokenizing and tabulating the types and usage frequencies of their individual performance marks without regard to the associated musical texts. Using analytic methods common in information science, the results demonstrated persistent statistical similarities among the works of each composer and differences among the work groups of different composers. Although based on a small sample, the results still offered statistical support for the existence of recurring stylistic patterns in composers' use of performance marks across their works.
Musical and Dramatic Functions of Loops and Loop Breakers in Philip Glass's Opera "The Voyage"
Philip Glass's minimalist opera The Voyage commemorates the 500th Anniversary of Christopher Columbus's discovery of America. In the opera, Philip Glass, like other composers, expresses singers' and non-singers' words and activities by means of melodies, rhythms, chords, textures, timbres, and dynamics. In addition to these traditional musical expressions, successions of reiterating materials (RMs, two or more iterations of materials) and non reiterating materials (NRMs) become new musical expressions. However, dividing materials into theses two categories only distinguishes NRMs from RMs without exploring relations among them in successions. For instance, a listener cannot perceive the functional relations between a partial iteration of the RM and the NRM following the partial RM because both the partial RM and the NRM are NRMs. As a result, a listener hears a succession of NRM followed by another NRM. When an analyst relabels the partial RM as partial loop, and the NRM following the partial RM as loop breaker, a listener hears the NRM as a loop breaker causing a partial loop. The musical functions of loops and loop breakers concern a listener's expectations of the creation, sustaining, departure, and return to the norm in successions of loops and loop breakers. When a listener associates the satisfaction and dissatisfaction of these expectations with dramatic devices such as incidents, words in dialogues and soliloquies, and activities by singers and non-singers, loops and loop breakers in successions become dramatically functional. This dissertation explores the relations among musical and dramatic functions of loops and loop breakers in Glass's musical commemoration of Columbus.
The Information Behavior of Individual Investors in Saudi Arabia
Information plays a significant role in the success of investment strategies. Within a non-advisory context, individual investors elect to build and manage their investment portfolios to avoid the cost of hiring professional advisors. To cope with markets’ uncertainty, individual investors should acquire, understand, and use only relevant information, but that task can be affected by many factors, such as domain knowledge, cognitive and emotional biases, information overload, sources’ credibility, communication channels’ accuracy, and economic costs. Despite an increased interest in examining the financial performance of individual investors in Saudi Arabia, there has been no empirical research of the information behavior of individual investors, or the behavioral biases affecting the investment decision making process in the Saudi stock market (SSM). The purpose of this study was to examine this information behavior within a non-advisory contextualization of their investment decision-making process through the use of an online questionnaire instrument using close-ended questions. The significant intervening variables identified in this study influence the individual investors’ information behavior across many stages of the decision making process. While controlling for gender, education, and income, the optimal information behavior of individual investors in the SSM showed that the Experience factor had the greatest negative effect on the Information Seeking Behavior of individual investors. This was followed by Risk Tolerance, Financial Self-Efficacy, Emotional Biases, Education Level, Formal Information Access, Regret Aversion Bias, and Subjective Financial Knowledge. The Information Acquisition and Information Searching Behavior was influenced by the Acquisition Skepticism, Regret Aversion Bias, Formal Information Access, Overconfidence, and Information Seeking Behavior. Furthermore, the findings indicate that Formal Information Sources have a statistically significant positive effect on the Information Seeking Behavior, and on the Information Acquisition and Information Searching of individual investors in Saudi Arabia. Finally, the Socioeconomic Status (SES) of individual investors in Saudi Arabia was significantly influenced by the employment status, work experience, age, marital status, and income.
Impetuses for First, Second, and Third Year Law Student Information Seeking Behavior, and Perception of Common Knowledge and Citation
This dissertation examined how previous information literacy training, law student gender, age, and previously obtained education affects first, second, and third year law students selection of information sources, their understanding of common knowledge, and their decision of whether or not to give attribution to these sources. To examine these factors, this study implemented a paradigm called the principle of least effort that contended humans in general tended to complete the least amount of work possible to complete presented tasks. This study sought to discover whether law students follow this same path of completing the least amount of work possible to finish presented tasks, and whether this behavior affects information source selection, citation, and understanding of common knowledge. I performed six focus groups and crafted and disseminated an online survey to examine these factors. Via this data collection, it was discovered that law students do exhibit some differences in understanding of citation and citation behavior based on age and their year in law school. They also exhibited some differences regarding common knowledge based on their year in law school, where they received their information literacy training, and where they attend law school. Yet, no statistically significant differences were discovered regarding where one attends law school and citation and source selection. Further this study revealed law students do follow this paradigm and seek the path of least resistance to accomplish law school assignments.
Electrodeposited Metal Matrix Composites for Enhanced Corrosion Protection and Mechanical Properties
Access: Use of this item is restricted to the UNT Community.
In the oil and gas industry, high corrosion resistance and hardness are needed to extend the lifetime of the coatings due to exposure to high stress and salt environments. Electrodeposition has become a favorable technique in synthesizing coatings because of low cost, convenience, and the ability to work at low temperatures. Electrodeposition of metal matrix composites has become popular for enhanced corrosion resistance and hardness in the oil and gas industry because of the major problems that persist with corrosion. Two major alloys of copper-nickel, 90-10 and 70-30, were evaluated for microbial corrosion protection in marine environments on a stainless steel substrate. Copper and copper alloys are commonly used in marine environments to resist biofouling of materials by inhibiting microbial growth. Literature surveying the electrodeposition of Cu-Ni incorporated with nano- to micro- particles to produce metal matrix composites has been reviewed. Also, a novel flow cell design for the enhanced deposition of metal matrix composites was examined to obtain the optimal oriented structure of the layered silicates in the metal matrix. With the addition of montmorillonite into the Ni and Cu-Ni matrix, an increase in strength, adhesion, wear and fracture toughness of the coating occurs, which leads to an increase corrosion resistance and longevity of the coating. These coatings were evaluated for composition and corrosion using many different types of instrumental and electrochemical techniques. The overall corrosion resistance and mechanical properties were improved with the composite films in comparison to the pure metals, which proves to be advantageous for many economic sectors including the oil and gas industry.
An Analysis of the Leadership Competency Frameworks of Nontraditional Principal Preparation Programs
This study explored the competency frameworks of nontraditional principal preparation programs to determine how they aligned to research-based best practices for school leaders. The research questions that guided this work were: To what degree are the McREL 21 Leadership Responsibilities addressed in the competency frameworks of nontraditional principal preparation programs? How do the leaders of the nontraditional principal preparation programs view the degree to which their competencies include the McREL 21 Leadership Responsibilities? A multi-case study analysis was conducted that compared the competency frameworks of four nontraditional principal preparation programs. The Knowledge is Power Program (KIPP), New Leaders, New York City Leadership Academy (NYCLA), and Teaching Trust were the nontraditional programs selected for this study. Leaders from the four organizations were interviewed. The findings from the research illustrated that a majority of the McREL 21 Leadership Responsibilities were included in the competency frameworks of nontraditional principal preparation programs. The study revealed that four of the McREL 21 were not included in any of the competency frameworks. Another finding was the lack of focus on talent management and personal dispositions in the McREL 21 Leadership Responsibilities. Nontraditional principal preparation programs are a growing avenue for principal preparation, as such their use of research on principal success was promising
Fatigue Behavior of A356 Aluminum Alloy
Access: Use of this item is restricted to the UNT Community.
Metal fatigue is a recurring problem for metallurgists and materials engineers, especially in structural applications. It has been responsible for many disastrous accidents and tragedies in history. Understanding the micro-mechanisms during cyclic deformation and combating fatigue failure has remained a grand challenge. Environmental effects, like temperature or a corrosive medium, further worsen and complicate the problem. Ultimate design against fatigue must come from a materials perspective with a fundamental understanding of the interaction of microstructural features with dislocations, under the influence of stress, temperature, and other factors. This research endeavors to contribute to the current understanding of the fatigue failure mechanisms. Cast aluminum alloys are susceptible to fatigue failure due to the presence of defects in the microstructure like casting porosities, non-metallic inclusions, non-uniform distribution of secondary phases, etc. Friction stir processing (FSP), an emerging solid state processing technique, is an effective tool to refine and homogenize the cast microstructure of an alloy. In this work, the effect of FSP on the microstructure of an A356 cast aluminum alloy, and the resulting effect on its tensile and fatigue behavior have been studied. The main focus is on crack initiation and propagation mechanisms, and how stage I and stage II cracks interact with the different microstructural features. Three unique microstructural conditions have been tested for fatigue performance at room temperature, 150 °C and 200 °C. Detailed fractography has been performed using optical microscopy, scanning electron microscopy (SEM) and electron back scattered diffraction (EBSD). These tools have also been utilized to characterize microstructural aspects like grain size, eutectic silicon particle size and distribution. Cyclic deformation at low temperatures is very sensitive to the microstructural distribution in this alloy. The findings from the room temperature fatigue tests highlight the important role played by persistent slip bands (PSBs) in fatigue crack initiation. At room temperature, cracks initiate along PSBs in the absence of other defects/stress risers, and grow transgranularly. Their propagation is retarded when they encounter grain boundaries. Another major finding is the complete transition of the mode of fatigue cracking from transgranular to intergranular, at 200 °C. This occurs when PSBs form in adjacent grains and impinge on grain boundaries, raising the stress concentration at these locations. This initiates cracks along the grain boundaries. At these temperatures, cyclic deformation is no longer microstructure- dependent. Grain boundaries don’t impede the progress of cracks, instead aid in their propagation. This work has extended the current understanding of fatigue cracking mechanisms in A356 Al alloys to elevated temperatures.
Continuous Combinatorics of a Lattice Graph in the Cantor Space
We present a novel theorem of Borel Combinatorics that sheds light on the types of continuous functions that can be defined on the Cantor space. We specifically consider the part X=F(2ᴳ) from the Cantor space, where the group G is the additive group of integer pairs ℤ². That is, X is the set of aperiodic {0,1} labelings of the two-dimensional infinite lattice graph. We give X the Bernoulli shift action, and this action induces a graph on X in which each connected component is again a two-dimensional lattice graph. It is folklore that no continuous (indeed, Borel) function provides a two-coloring of the graph on X, despite the fact that any finite subgraph of X is bipartite. Our main result offers a much more complete analysis of continuous functions on this space. We construct a countable collection of finite graphs, each consisting of twelve "tiles", such that for any property P (such as "two-coloring") that is locally recognizable in the proper sense, a continuous function with property P exists on X if and only if a function with a corresponding property P' exists on one of the graphs in the collection. We present the theorem, and give several applications.
Do Re Mi? Yes! Using Music and Visual Arts to Promote Thai Children's English Vocabulary Development
This research examines the efficacy, if any, of the Music and Visual Arts (MVA) program in improving the English vocabulary development of first grade Thai students. The researcher developed the Vocabulary Recognition Assessment (VRA) as a measure of English vocabulary development. It employs the accuracy and rapidity method of word recognition as a measurement of English language development in Thai children. Forty first grade Thai students in a Bangkok elementary school participated in the study. Participants were divided equally between an experimental group and a control group. During a nine-week period, students in the experimental group were instructed with the MVA strategy, while students in the control group were taught with the Visual Arts (VA) strategy. Paired sample t-test, ANOVA, and ANCOVA were used to analyze data from the VRA, to compare the pre-test and the post-test in terms of accuracy scores and rapidity scores of the control group and the experimental group. Data revealed that students instructed with the MVA strategy improved their English vocabulary development in terms of accuracy of word recognition significantly more than students taught English using the VA strategy. No significant difference was found between the MVA strategy and the VA strategy in terms of rapidity of word recognition. The MVA strategy could be a useful strategy for Thai early childhood teachers to use in helping Thai children learn English vocabulary.
Intraoral Pressure and Sound Pressure During Woodwind Performance
For woodwind and brass performers, intraoral pressure is the measure of force exerted on the surface area of the oral cavity by the air transmitted from the lungs. This pressure is the combined effect of the volume of air forced into the oral cavity by the breathing apparatus and the resistance of the embouchure, reed opening, and instrument’s back pressure. Recent research by Michael Adduci shows that intraoral pressures during oboe performance can exceed capabilities for corresponding increases in sound output, suggesting a potentially hazardous situation for the development of soft tissue disorders in the throat and velopharyngeal insufficiencies. However, considering that oboe back pressure is perhaps the highest among the woodwind instruments, this problem may or may not occur in other woodwinds. There has been no research of this type for the other woodwind instruments. My study was completed to expand the current research by comparing intraoral pressure (IOP) and sound pressure when performing with a characteristic tone on oboe, clarinet, flute, bassoon, and saxophone. The expected results should show that, as sound pressure levels increase, intraoral pressure will also increase. The subjects, undergraduate and graduate music majors at the University of North Texas, performed a series of musical tasks on bassoon, clarinet, flute, oboe, and alto saxophone. The musical tasks cover the standard ranges of each instrument, differences between vibrato and straight-tone, and a variety of musical dynamics. The data was collected and examined for trends. The specific aims of this study are to (1) determine whether there is a correlation between IOP and sound pressure, (2) shed light on how well each instrument responds to rapid fluctuation, and (3) determine which instruments are most efficient when converting air pressure into sound output. Results of this study raised concerns shared by previous studies – that woodwind players are potentially causing harm to their oropharynx by inaccurately perceiving intraoral pressure needed to achieve a characteristic sound. Evidence found by this study suggests that while oboists generate high intraoral pressure for relatively little sound output (a fact corroborated by past studies), the same cannot be said for all of the woodwind instruments, particularly the flute.
Preferred Qualifications of Collegiate Athletic Directors: Opinions of Presidents and Athletic Directors
This study explored the preparation methods, qualifications and criteria that both university and athletic directors deemed necessary when searching for athletic directors. Participants completed a survey via Qualtrics online software. Two different populations were sampled for this study: 651 university presidents and 651 athletic directors whose schools compete in either Division I or II in the NCAA, resulting in 96 abd 150 usable responses respectively. Participants in both groups were primarily white males with mean ages of 62 for presidents and 52 for the athletic directors. The study provided demographic information, educational history, professional experience, and prior careers of athletic directors. The rankings of the athletic were compared to the rankings of the presidents and identified consistenncies of opinions. The respondent groups were in agreement on the qualities and ranking of many dimensions of leadershihp in this role. The top seven, for both groups, in order, were ethics, budgeting and finances skills, fundraising, communications, sport leadership, strategic management and policy, and athletic administration. This information could be used as a guide for people who want to strategically maneuver up the ranks in athletics administration. Presidents might use the information as they prepare to hire candidates for the athletic director position.
Decision Makers’ Cognitive Biases in Operations Management: An Experimental Study
Access: Use of this item is restricted to the UNT Community.
Behavioral operations management (BOM) has gained popularity in the last two decades. The main theme in this new stream of research is to include the human behavior in Operations Management (OM) models to increase the effectiveness of such models. BOM is classified into 4 areas: cognitive psychology, social psychology, group dynamics and system dynamics (Bendoly et al. 2010). This dissertation will focus on the first class, namely cognitive psychology. Cognitive psychology is further classified into heuristics and biases. Tversky and Kahneman (1974) discussed 3 heuristics and 13 cognitive biases that usually face decision makers. This dissertation is going to study 6 cognitive biases under the representativeness heuristic. The model in this dissertation states that cognitive reflection of the individual (Frederick 2005) and training about cognitive biases in the form of warning (Kaufmann and Michel 2009) will help decisions’ makers make less biased decisions. The 6 cognitive biases investigated in this dissertation are insensitivity to prior probability, insensitivity to sample size, misconception of chance, insensitivity to predictability, the illusion of validity and misconception of regression. 6 scenarios in OM contexts have been used in this study. Each scenario corresponds to one cognitive bias. Experimental design has been used as the research tool. To see the impact of training, one group of the participants received the scenarios without training and the other group received them with training. The training consists of a brief description of the cognitive bias as well as an example of the cognitive bias. Cognitive reflection is operationalized using cognitive reflection test (CRT). The survey was distributed to students at University of North Texas (UNT). Logistic regression has been employed to analyze data. The research shows that participants show the cognitive biases proposed by Tversky and Kahneman. Moreover, CRT is significant factor to predict the cognitive bias in two scenarios. Finally, providing training in terms of warning helps participants to make more rational decisions in 4 scenarios. This means that although cognitive biases are inherent in the mind of people, management of corporations has the tool to educate its managers and professionals about such biases which helps companies make more rational decisions.
Community-based Logistics and Supply Chain Management: Developing, Testing and Validating Conceptual Models
Access: Use of this item is restricted to the UNT Community.
The field of Logistics and Supply Chain Management (LSCM) suggests that transactions, collaboration, and value are important in the supply and delivery of products and services to meet the need of impoverished end-consumers. In many cases, the application of LSCM is paramount in most strategic decision-making efforts. Therefore, this research explores the applications of LSCM processes and activities within the community-based context. The methodology used to address the research questions consisted of a hybrid of mixed methods. This mixed methodology provides three essays that investigate the application and development of LSCM in the community-based context. The essays address the flow of charitable products and services through supply chains. The dissertation does not pay close attention to the first-tier suppliers’ suppliers, which is looking at the originating flow of goods and services (raw materials, manufacturing, etc.). However, the dissertation puts a focus on products and services supplied to focal organizations and how these products are then passed on to end-consumers. Essay I looks at the transaction (costs) that ensue from the supply of charitable products. Essay II analyzes a social service ecosystem and investigates how the network of organizations enable the distribution of charitable products and services. Lastly, Essay III examines the delivery of valuable services to the end-consumers, and what tools Community-Based Enterprises (CBEs) should focus on to develop and retain end-consumers in impoverished communities. The research provides conceptual models that review some fundamental LSCM achievement gaps in supplying, delivering and providing social services to end users within impoverished communities. The dissertation draws upon literature from the fields of economics, marketing, social science, and logistics and supply chain management. The dissertation uses the primary research method of unstructured and semi-structured interviews, case studies, written survey instruments and system dynamics within three studies. The studies resolve to look into the term Community-Based Logistics and Supply Chain Management (CBLSCM) as employed by social service providers in the logistics and supply chain context and investigate how it applies to impoverished communities. The research identifies conceptual models that can be used to explain the role of LSCM within humanitarian aid context. The models offer insights on the managerial implications and evidence of using LSCM processes and techniques within impoverished communities. The research has considered that the type of transactional relationships, structure, shared value, service systems, and consumer value, retention and management mechanisms can be achieved utilizing LSCM.
Ours is the Kingdom of Heaven: Racial Construction of Early American Christian Identities
This project interrogates how religious performance, either authentic or contrived, aids in the quest for freedom for oppressed peoples; how the rhetoric of the Enlightenment era pervades literatures delivered or written by Native Americans and African Americans; and how religious modes, such as evoking scripture, performing sacrifices, or relying upon providence, assist oppressed populations in their roles as early American authors and speakers. Even though the African American and Native American populations of early America before the eighteenth century were denied access to rights and freedom, they learned to manipulate these imposed constraints--renouncing the expectation that they should be subordinate and silent--to assert their independent bodies, voices, and spiritual identities through the use of literary expression. These performative strategies, such as self-fashioning, commanding language, destabilizing republican rhetoric, or revising narrative forms, become the tools used to present three significant strands of identity: the individual person, the racialized person, and the spiritual person. As each author resists the imposed restrictions of early American ideology and the resulting expectation of inferior behavior, he/she displays abilities within literature (oral and written forms) denied him/her by the political systems of the early republican and early national eras. Specifically, they each represent themselves in three ways: first, as a unique individual with differentiated abilities, exceptionalities, and personality; second, as a person with distinct value, regardless of skin color, cultural difference, or gender; and third, as a sanctified and redeemed Christian, guaranteed agency and inheritance through the family of God. Furthermore, the use of religion and spirituality allows these authors the opportunity to function as active agents who were adapting specific verbal and physical methods of self-fashioning through particular literary strategies. Doing so demonstrates that they were not the unrefined and unfeeling individuals that early American political and social restrictions had made them--that instead they were intellectually and morally capable of making both physical and spiritual contributions to society while reciprocally deserving to possess the liberties and freedoms denied them.
Teaching beyond the walls: A mixed method study of prospective elementary teachers’ belief systems about science instruction.
This mixed method study investigated K-6 teacher candidates' beliefs about informal science instruction prior to and after their experiences in a 15-week science methods course and in comparison to a non-intervention group. The study is predicated by the literature that supports the extent to which teachers' beliefs influence their instructional practices. The intervention integrated the six strands of learning science in informal science education (NRC, 2009) and exposed candidates to out-of-school-time environments (NRC, 2010). Participants included 17 candidates in the intervention and 75 in the comparison group. All were undergraduate K-6 teacher candidates at one university enrolled in different sections of a required science methods course. All the participants completed the Beliefs about Science Teaching (BAT) survey. Reflective journals, drawings, interviews, and microteaching protocols were collected from participants in the intervention. There was no statistically significant difference in pre or post BAT scores of the two groups; However, there was a statistically significant interaction effect for the intervention group over time. Analysis of the qualitative data revealed that the intervention candidates displayed awareness of each of the six strands of learning science in informal environments and commitment to out-of-school-time learning of science. This study supports current reform efforts favoring integration of informal science instructional strategies in science methods courses of elementary teacher education programs.
Stable Nanocrystalline Au Film Structures for Sliding Electrical Contacts
Access: Use of this item is restricted to the UNT Community.
Hard gold thin films and coatings are widely used in electronics as an effective material to reduce the friction and wear of relatively less expensive electrically conductive materials while simultaneously seeking to provide oxidation resistance and stable sliding electrical contact resistance (ECR). The main focus of this dissertation was to synthesize nanocrystalline Au films with grain structures capable of remaining stable during thermal exposure and under sliding electrical contact stress and the passing of electrical current. Here we have utilized a physical vapor deposition (PVD) technique, electron beam evaporation, to synthesize Au films modified by ion implantation and codeposited ZnO hardened Au nanocomposites. Simultaneous friction and ECR experiments of low fluence (< 1x10^17 cm^-2) He and Ar ion implanted Au films showed reduction in friction coefficients from ~1.5 to ~0.5 and specific wear rates from ~4x10^-3 to ~6x10^-5 mm^3/N·m versus as-deposited Au films without significant change in sliding ECR (~16 mΩ). Subsurface microstructural changes of He implanted films due to tribological stress were analyzed via site-specific cross-sectional transmission electron microscopy (TEM) and revealed the formation of nanocrystalline grains for low energy (22.5 keV) implantation conditions as well as the growth and redistribution of cavities. Nanoindentation hardness results revealed an increase from 0.84 GPa for as-deposited Au to ~1.77 GPa for Au uniformly implanted with 1 at% He. These strength increases are correlated with an Orowan hardening mechanism that increases proportionally to (He concentration)1/3. Au-ZnO nanocomposite films in the oxide dilute regime (< 5 vol% ZnO) were investigated for low temperature aging stability in friction and ECR. Annealing at 250 °C for 24 hours Au-(2 vol%)ZnO retained a friction coefficient comparable to commercial Ni hardened Au of ~ 0.3 and sliding ECR values of ~35 mΩ. Nanoindentation hardness increases of these films (~2.6 GPa for 5 vol% ZnO) are correlated to microstructure via high resolution TEM and scanning electron microscope cross-sections to both Hall-Petch and Orowan strengthening mechanisms. Also presented is a correlation between electrical resistivity and grain size in the oxide dilute range based on the Mayadas-Shatzkes (M-S) electron scattering model. Using the M-S model in combination with a model describing solute drag stabilized grain growth kinetics we present a new technique to probe grain boundary mobility and thermal stability from in-situ electrical resistivity measurements during annealing experiments.
Louis Vierne’s Pièces de Fantaisie, Opp. 51, 53, 54, and 55: Influence from Claude Debussy and Standard Nineteenth-Century Practices
The purpose of this research is to document how Claude Debussy’s compositional style was used in Louis Vierne’s organ music in the early twentieth century. In addition, this research seeks standard nineteenth-century practices in Vierne’s music. Vierne lived at the same time as Debussy, who largely influenced his music. Nevertheless, his practices were varied on the basis of Vierne’s own musical ideas and development, which were influenced by established nineteenth-century practices. This research focuses on the music of Louis Vierne’s Pièces de fantaisie, Opp. 51, 53, 54, and 55 (1926-1927). In order to examine Debussy’s practices and standard nineteenth-century practices, this project will concentrate on a stylistic analysis that demonstrates innovations in melody, harmony, and mode compared to the existing musical styles.
Cross-cultural adjustment of self-initiated expatriates and individual work performance.
Globalization in the past few decades has been marked by increased mobility of highly skilled workers from one country to another. Even though self-initiated expatriation is a widespread phenomenon, it is a relatively under-researched phenomenon in the academic literature, especially in an organizational context. Existing literature shows that not all individuals are equally suited to embark on a new life in another country, and self-initiated expatriates (SIEs) could be particularly susceptible to failure since they have no support from a home organization. This study was designed to investigate the experiences of self-initiated professional expatriates and the effect it had on their work performance. The purpose was to understand how their organizational and social experience affected their cross-cultural adjustment process and in turn affected their individual work performance. The researcher used a qualitative method using semi-structured interviews, observations, and documents with ten self-initiated expatriates. This study contributed to the expanding literature on the experiences of self-initiated expatriates, specifically how different support systems affected cross-cultural adjustment and individual work performance.
The Mystery of the Chalumeau and Its Historical Significance as Revealed Through Selected Works for Chalumeau or Early Clarinet by Antonio Vivaldi
Factual evidence concerning the ancestry of the clarinet has been a perpetual topic of debate among musicologists and organologists. Scholars have widely agreed that the clarinet, first documented in 1710, emerged from the baroque invention of the chalumeau (invented circa 1690), which in itself was an improvement upon the recorder. Considering the chalumeau’s short lifespan as the predominant single reed instrument in the early eighteenth century, the chalumeau inspired a monumental amount of literature that includes vocal and instrumental genres written by distinguished composers. Vivaldi is considered to be the most significant composer that wrote for both clarinet and chalumeau; he wrote for both instruments simultaneously throughout his life whereas his contemporaries seemingly replaced the chalumeau with the clarinet. This project will discuss Vivaldi’s proximity to the chalumeau and the clarinet and will provide an in-depth analysis of relevant works by the composer to determine how he, unlike his contemporaries, treated the chalumeau and the clarinet as separate and equally viable instruments. Following a brief history of the chalumeau and clarinet in Italy and a relevant biography of Vivaldi (Ch. 2), this document will discuss the integral Vivaldi compositions that include clarinet and chalumeau and the role of the clarinet or chalumeau in each work (Ch. 3). Chapter 4 solves the mystery of why Vivaldi continued to compose for the chalumeau while his contemporaries replaced the chalumeau with the clarinet.
Transmedia STEM Intervention Book in Middle School for Educational Change
The world is becoming a global place in which science, technology, engineering and mathematics hold a key to a successful future. To help secure this future it is important to engage students early with relevant curriculum that sparks interest and success in STEM fields. However, education reform occurs slowly, so this paper looked at a potential paradigm that can help to bring about change in a middle school environment that harnesses the long standing strengths of learning and education with the integration of technology to create changes in the pedagogy of learners and teachers. The study implemented a transmedia STEM book and evaluated the impact it had on student perceptions of STEM, school attitude, academic achievement, and preferred activity types, providing an example vehicle for change that can be adopted over time. The main findings showed that students who used a 3-Dimensional printer had higher math achievement and a more positive perception of math.
Analysis of Factors for Successful State-Level Support of Low-Performing Schools
This study provides a qualitative look at Texas' Professional Service Providers' (PSPs) strategies for supporting low-performing schools. Four PSPs were selected for participation based on the number of schools they helped exit the Texas Title I School Improvement Program from 2007-2012. Data collected and analyzed included provider and principal interviews, providers' progress reports documenting services, and principals' evaluations of provider services. Results indicated key support strategies in two of four cases were supporting and mentoring/coaching while communicating and building trust were important in the other two cases. Communicating, reviewing information, and planning were important across all cases. The quality indicators aligning with the PSPs' strategies were fit, comprehensiveness, and coherence. They were also the most common across all cases. Finally, analysis of the evaluation of provider services revealed PSP-1 with the highest ratings, followed by PSP-2, PSP-3, and PSP-4 respectively. The findings suggest, first, that PSP support has a dual nature. Contextual support was provided based on the campus leaderships' skills and requests. PSPs also ensured coherence among the strategies of all stakeholders. Secondly, a hierarchy of quality service indicators aligned to the PSPs' strategies: fit, comprehensiveness, and coherence. Finally relationships are vital to a successful provider-campus relationship. The findings have implications for PSP selection, professional development, and evaluation.
Social-Emotional Competencies of African American Children: Impact of Child-Centered Play Therapy
African American children experience risks due to heightened socio-environmental problems and responding to negative racial messages in their environments. Child Centered Play Therapy (CCPT) is one viable intervention for the development of social emotional competence among African American children to help mediate adverse conditions. I sought to explore the effects of CCPT on the social emotional competencies of African American children utilizing Social Emotional Assets and Resilience Scale-Parent & Teacher (SEARS-P; SEARS-T) reports. Thirty-seven African American participants with a mean age of 6.68 years were recruited from four suburban elementary schools in the southwest U.S. Twenty participants were randomly assigned to the intervention group receiving a mean of 13.3 CCPT sessions over 8 weeks, and 17 participants were assigned to the waitlist control group. Factorial ANOVA results indicated that parents reported statistically and practically significant improvement for children who participated in CCPT in overall social-emotional competencies. Follow-up analysis revealed statistical and practical improvement in children’s empathy, as well as practical improvement in self-regulation/responsibility and social competence. Teacher-reported results indicated practical but non-statistically significant improvement in overall social-emotional competencies for children who participated in CCPT, including statistical and practical improvement in children’s responsibility, as well as practical improvement in self-regulation, social competence, and empathy. Thus, CCPT showed promise as a culturally responsive treatment intervention to improve African American children’s social-emotional competencies
The Contemporary Bassoonist: Music for Interactive Electroacoustics and Bassoon
As the bassoon has evolved over time, the music written for the instrument has evolved around it, and was many times the catalyst for its evolution. Bassoon music of the seventeenth through early twentieth centuries has defined much of the curricula for bassoon studies, and has established how we consider and experience the bassoon. We experience, write, and consume music in vastly different ways than just a generation ago. Humans use technology for the most basic of tasks. Composers are using the technology of our generation to compose music that is a reflection of our time. This is a significant aspect of art music today, and bassoonists are barely participating in the creation of this new repertoire. Performance practice often considers only the musical score; interactive electronic music regularly goes beyond that. The combination of technological challenges and inexperience can make approaching electroacoustic music a daunting and inaccessible type of music for bassoonists. These issues require a different language to the performance practice: one that addresses music, amplification, computer software, hardware, the collaboration between performer and technology, and often the performer and composer. The author discusses problems that performers face when rehearsing and performing interactive electroacoustic works for bassoon, and offers some solutions.
Preparing Selected Wind Band Euphonium Audition Materials Through the Use of Etudes
Etudes have been composed to address the primary challenges found in ten selected euphonium wind band pieces. Each work was chosen based on its frequency of occurrence in military band auditions as well as its appearance in excerpt books and journal articles. Practice drills, practice variations, and overtraining studies are the primary concepts used for composing each etude. List of selected works: (1) Roman Carnival Overture Op. 9, Hector Berlioz; (2) First Suite in E-flat for Military Band Op. 28 No. 1, Gustav Holst; (3) Barnum and Bailey's Favorite, Karl King; (4) The Melody Shop, Karl King; (5) Aegean Festival Overture, Andreas Makris arr. Albert Bader; (6) Theme and Variations Op. 43 A, Arnold Schoenberg; (7) Festive Overture Op. 96, Dmitri Shostakovich arr. Donald Hunsberger; (8) Festival Variations, Claude T. Smith; (9) The Stars and Stripes Forever, John Philip Sousa; and (10) Suite from the Ballet: Pineapple Poll, Arthur Sullivan arr. Charles Mackerras.
Taxpayer compliance from three perspectives: A study of economic, environmental, and personal determinants.
Tax evasion is a serious issue that influences governmental revenues, IRS enforcement strategies, and tax policy decisions. While audits are the most effective method of enforcing compliance, they are expensive to conduct and the IRS is only able to audit a fraction of the returns filed each year. This suggests that audits alone are not sufficient to curb the billions of dollars of tax evaded by taxpayers each year and that a better understanding of factors influencing compliance decisions is needed to enable policymakers to craft tax policies that maximize voluntary compliance. Prior research tends to model compliance as economic, environmental, or personal decisions; however, this study models it as a multifaceted decision where these three perspective individually and interactively influence compliance. It is the first to decompose perceived detection risk into two dimensions (selection risk and enforcement risk) and investigates how these two dimensions of risk, decision domains (refund or tax due positions), and three personal factors (mental accounting, narcissism, and proactivity) influence taxpayers’ compliance decisions. I conducted a 2x2 fully crossed experiment involving 331 self-employed taxpayers. These taxpayers have opportunities to evade that employed taxpayers do not. For example, they can earn cash income that is not reported to the IRS by third parties. For self-employed taxpayers (especially those wanting to evade), perceived selection and enforcement risks may be distinctly different depending on a taxpayer’s situation, what they believe they can control, and what risk they are willing to accept. For example, selection risk may be perceived as the greatest risk for those with unreported items on their return, while enforcement risk may be more prominent for those perceiving certain levels of selection risk. Thus, I believe self-employed taxpayers are the most appropriate population to sample from and are likely have reasonable variation in the three personal factors of interest. I find that taxpayers do differentiate between selection and enforcement risks but the difference only manifests for taxpayers in certain decision domains. Taxpayers in a refund position (i.e. conservative mindset) had a greater sensitivity to the form of payment (cash vs. check) and appeared to use this information to make inferences about enforcement risk which was significantly different from their perceptions of selection risk. Conversely, tax due taxpayers (i.e. aggressive mindset) appeared to overlook the form of payment and did not assess these two risks as significantly different. Evaluating the full sample suggests that both selection risk and enforcement risk have a positive influence on compliance. Further, these risks interact to influence compliance. Specifically, compliance is greatest when taxpayers perceive a high likelihood of being selected for an audit and enforcement risk only matters when selection risk is low. This finding is interesting and suggests that avoiding interaction with the IRS is a primary objective of taxpayers. In line with my findings of taxpayers perceiving different risks in refund and tax due positions, the influence of risk perceptions on compliance differed for taxpayers in these positions. Refund taxpayers were influenced by both selection and enforcement risk, similar to the full model; however, tax due taxpayers were only influenced by selection risk and appeared to completely overlook enforcement risk when making their reporting decision. Lastly, the study shows that personal characteristics can also influence compliance in the presence of economic and environmental determinants, but some characteristics only manifest in specific decision domains. Of the three personal characteristics investigated, only mental accounting orientation was a significant predictor for the full sample. When the sample was split by decision domain, only proactivity was a predictor of compliance for refund taxpayers, while only mental accounting orientation was a predictor of compliance for due taxpayers. While I did not find results for narcissism and compliance, my subsequent analysis suggests that individual dimensions of narcissism may be better predictors of compliance than the full measure. Specifically, the exploitation dimension was a significant predictor of compliance for those in a tax due position. This study make several contributions to the accounting and tax literatures. First, this study provides support for a two-construct conceptualization for perceived detection risk that includes both selection and enforcement risks. Second, it answers calls to investigate more comprehensive compliance models and finds economic, environmental, and personal characteristics individually and interactively influence compliance. Third, this study investigates three personal factors that have not been investigated in the tax compliance literature. Finally, this study answers calls for research on self-employed taxpayers and suggests that the IRS will be more successful in increasing compliance by playing on taxpayers’ aversion to being selected for an examination than communicating information on the IRS’ ability to detect noncompliance during an examination.
Physician Leadership and Self Efficacy: A Case Study Using Grounded Theory
Bombarded by constant and rapid change, healthcare organizations feel a sense of urgency to meet their needs for leaders. They rely on physicians to lead at all levels in their healthcare organizations. For them to successfully navigate today's healthcare environment, they require more than a medical education. To address this need, healthcare organizations are developing in-house leadership development programs.In this paper, I conduct a case study of physicians transitioning into leadership and their self-efficacy facilitated through an in-house leadership development program. Documentation, semi-structured interviews, and observations are examined to explore how physicians think about their leadership experiences following their participation in a six-month leadership development program.The study also explores at a high-level how these experiences influenced physician's self-efficacy as a first step in developing a theory of physician leadership and self-efficacy.
Interfacial Electrochemistry of Cu/Al Alloys for IC Packaging and Chemical Bonding Characterization of Boron Doped Hydrogenated Amorphous Silicon Films for Infrared Cameras
Access: Use of this item is restricted to the UNT Community.
We focused on a non-cooling room temperature microbolometer infrared imaging array device which includes a sensing layer of p-type a-Si:H component layers doped with boron. Boron incorporation and bonding configuration were investigated for a-Si:H films grown by plasma enhanced chemical deposition (PECVD) at varying substrate temperatures, hydrogen dilution of the silane precursor, and dopant to silane ratio using multiple internal reflection infrared spectroscopy (MIR-IR). This study was then confirmed from collaborators via Raman spectroscopy. MIR-IR analyses reveal an interesting counter-balance relationship between boron-doping and hydrogen-dilution growth parameters in PECVD-grown a-Si:H. Specifically, an increase in the hydrogen dilution ratio (H2/SiH4) or substrate temperature was found to increase organization of the silicon lattice in the amorphous films. It resulted in the decrease of the most stable SiH bonding configuration and thus decrease the organization of the film. The new chemical bonding information of a-Si:H thin film was correlated with the various boron doping mechanisms proposed by theoretical calculations. The study revealed the corrosion morphology progression on aluminum alloy (Al, 0.5% Cu) under acidic chloride solution. This is due to defects and a higher copper content at the grain boundary. Direct galvanic current measurement, linear sweep voltammetry (LSV), and Tafel plots are used to measure corrosion current and potential. Hydrogen gas evolution was also observed (for the first time) in Cu/Al bimetallic interface in areas of active corrosion. Mechanistic insight that leads to effective prevention of aluminum bond pad corrosion is explored and discussed. (Chapter 4) Aluminum bond pad corrosion activity and mechanistic insight at a Cu/Al bimetallic interface typically used in microelectronic packages for automotive applications were investigated by means of optical and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and electrochemistry. Screening of corrosion variables (temperature, moisture, chloride ion concentration, pH) have been investigated to find their effect on corrosion rate and to better understand the Al/Cu bimetallic corrosion mechanism. The study revealed the corrosion morphology progression on aluminum alloy (Al, 0.5% Cu) under acidic chloride solution. The corrosion starts as surface roughening which evolves into a dendrite structure and later continues to grow into a mud-crack type corrosion. SEM showed the early stage of corrosion with dendritic formation usually occurs at the grain boundary. This is due to defects and a higher copper content at the grain boundary. The impact of copper bimetallic contact on aluminum corrosion was explored by sputtering copper microdots on aluminum substrate. Copper micropattern screening revealed that the corrosion is activated on the Al/Cu interface area and driven by the large potential difference; it was also seen to proceed at much higher rates than those observed with bare aluminum. Direct galvanic current measurement, linear sweep voltammetry (LSV), and Tafel plots are used to measure corrosion current and potential. Hydrogen gas evolution was also observed (for the first time) in Cu/Al bimetallic interface in areas of active corrosion. Mechanistic insight that leads to effective prevention of aluminum bond pad corrosion is explored and discussed. Micropattern corrosion screening identified hydrogen evolution and bimetallic interface as the root cause of Al pad corrosion that leads to Cu ball lift-off, a fatal defect, in Cu wire bonded device. Complete corrosion inhibition can be achieved by strategically disabling the mutually coupled cathodic and anodic reaction cycles.
An Analytical Study of Paradox and Structural Dualism in the Music of Ludwig van Beethoven
Beethoven's rich compositional language evokes unique problems that have fueled scholarly dialogue for many years. My analyses focus on two types of paradoxes as central compositional problems in some of Beethoven's symphonic pieces and piano sonatas. My readings of Beethoven's Piano Sonata No. 27 (Op. 90), Symphony No. 4 (Op. 60), and Symphony No. 8 (Op. 93) explore the nature and significance of paradoxical unresolved six-four chords and their impact on tonal structure. I consider formal-tonal paradoxes in Beethoven's Tempest Sonata (Op. 31, No. 2), Ninth Symphony (Op. 125), and Overture die Weihe des Hauses (Op. 124). Movements that evoke formal-tonal paradoxes retain the structural framework of a paradigmatic interrupted structure, but contain unique voice-leading features that superimpose an undivided structure on top of the "residual" interrupted structure. Carl Schachter's observations about "genuine double meaning" and his arguments about the interplay between design and tonal structure in "Either/Or" establish the foundation for my analytical approach to paradox. Timothy Jackson's reading of Brahms' "Immer leiser word meine Schlummer" (Op. 105, No. 2) and Stephen Slottow's "Von einem Kunstler: Shapes in the Clouds" both clarify the methodology employed here. My interpretation of paradox involves more than just a slight contradiction between two Schenkerian readings; it involves fundamentally opposed readings, that both result from valid, logical lines of analytical reasoning. In my view, paradoxes could be considered a central part of Beethoven's persona and philosophy. Beethoven's romantic endeavors and his relationships with mentors suggest that paradoxes might have been central to his bravura. Furthermore, Beethoven's familiarity with the politics of the French Revolution and Shakespearean literature suggest that paradoxes in some pieces (including the Ninth Symphony) could be metaphorical representations of his ideology. However, I do not attempt to explicitly link specific style features to extra-musical ideas. Modern Schenkerian scholars continue to expand and refine Schenker's formal-tonal models as well as his concept of interruption. In my view, by considering paradox as a focal compositional problem, we can better understand some of the formal-tonal issues and shifting allegiances in Beethoven's music and take another step beyond the rigidity of some paradigmatic formal-tonal prototypes.
Transfer of Instructional Practices From Freedom Schools to the Classroom
The instructional practices of three current classroom teachers who formerly served as Servant Leader Interns (SLIs) in the Children’s Defense Fund Freedom Schools (CDFFS) Program were examined. Haskell (2001) outlined eleven principles of transfer of learning, which were used to survey the levels of transfer established from service in Freedom Schools to practice in the traditional classroom. Individual surveys, The Freedom School Pedagogies Teacher Observation Record (FSPTOR) along with interviews of each participant were used for data collection; all three components were used to triangulate the findings. The findings from this study verified that low transfer was observed when the minimal application of the principles of learning was applied. This study revealed that for transfer to occur at high levels, it is imperative that adherence to all 11 principals is made, and the understanding of transfer, the application of transfer, and reflection on transfer are implemented. If the transfer of instructional practices is a goal of CDFFS for SLIs, the CDFFS program should consider implementing transfer of learning theory in future SLI training.
Unpacking Self in Clutter and Cloth: Curator as Artist/Researcher/Teacher
Access: Use of this item is restricted to the UNT Community.
This a/r/tographic dissertation offers opportunities to interrogate curator identity and curator ways of being in both public and private spaces. Instead of an authoritative or prescriptive look at the curatorial, this dissertation as catalogue allows for uncertainty, for messiness, for vulnerable spaces where readers are invited into an exhibition of disorderly living. Stitched throughout the study are stories of mothering and the difficulties that accompanied the extremely early birth of my daughter. Becoming a mother provoked my curating in unexpected ways and allowed me to reconsider the reasons I collect, display, and perform as a curator. It was through the actual curating of familial material artifacts in the exhibition Dress Stories, I was able to map the journey of my curatorial turns. My engagement with clothing in the inquiry was informed by the work of Sandra Weber and Claudia Mitchell, where dress as a methodology allows for spaces to consider autobiography, identity, and practice. It was not until the exhibition was over, I was able to discover new ways to thread caring, collecting, and cataloging ourselves as curators, artists, researchers, teachers, and mothers. It prompts curators and teachers to consider possibilities for failure, releasing excess, and uncaring as a way to care for self, objects, and others.
A Spatial Econometric Study Examining the Determinants of Principal Salaries
The lack of evidence on reforms, such as determinants of principal salary, points to data and research deficiencies to be addressed in order to learn more about their effects and make sound public policies. The purpose of the study was to examine district and community determinants of principals’ salaries using a spatial econometric framework. The findings have implications for education policy development related to pay for contribution, rather than pay based on tenure, experience, or district wealth. The quantitative study used a spatial regression approach to model school, district, and community factors as determinants of Texas high school principal’s salary. Principal salaries are viewed from several lenses in this study by considering effective outcomes of pay defined by actual salaries and market considerations for pay as defined by community, organizational and human capital variables. Literature from the private sector as well as from the public school setting was used as a theoretical underpinning for the hypotheses set forth in this study. The findings provide empirical insights regarding how principal salaries are determined. The study found a statistically significant spatial autocorrelation relationship at p<.05 confirming geographic locations is a robust influence on principal salaries. After controlling for the spatial autocorrelation the study also found experience, gender, district wealth, and campus size significantly influence principal salaries. However, there was no statistically significant relationship between principal salary and student achievement. .
Accelerated Degree Program Faculty: Motivation to Teach
Adult educators are a growing part of American higher education. Because of their increasing prominence in adult education, it is essential to understand what roles these educators play and what motivates them to remain in the profession despite poor work prospects and conditions. Research to date, however, focuses primarily on the adult learner and not the adult educator. The purpose of this qualitative, multiple-case study was to explore the role and motivation for teaching of adult educators employed as adjunct faculty in an accelerated degree program at a small, liberal arts college in the northwest United States. Purposeful sampling was used to select the five participants for the study. All participants taught in the program for more than five years and were considered to be successful in their positions by peers, students, and administrators. The study employed a preliminary demographic survey to solicit initial background data on the instructors. Other data collection included in-depth, open-ended, face-to-face interviews, document analysis, and classroom observation. The results showed that all five participants identified the following roles and assumed them in the classroom: (a) facilitator, (b) listener, (c) specialist, (d) guide, (e) adviser, and (f) co-learner or colleague. Further results showed that all five participants were motivated to teach in the program for reasons other than monetary compensation. Although participants shared different levels of personal commitment to the institution, they all expressed extensive commitment to teaching, their discipline, and students. Motivating factors for teaching were (a) opportunity to teach part time, (b) love for the subject, (c) opportunity to gain more expertise in the field, (d) opportunity to grow and learn, (e) opportunity to give back, and (f) student success and growth. A major practical implication of this study is that adjunct faculty in an adult education program are motivated to teach for different reasons, but the primary motivation can be seen as altruistic versus monetary and practical. If college administrators want to produce and retain successful adjunct faculty, they must recruit and hire those individuals whose motivation for teaching is altruistic with a desire to enrich the lives of students.
Master Therapists' Decision Making Process Concerning Adolescent Confidentiality: A Grounded Theory Approach
Ethical codes and laws provide counselors with guidance for how to approach confidentiality, but there is a gap in the literature surrounding counselors' process of decision-making when managing confidentiality with a adolescent clients. This study explored the decision-making process of master therapists concerning adolescent clients. I conducted semi-structured interviews with peer identified master therapist (N=10), all of whom were licensed professional counselors with 15 or more years of counseling experience and whose case load contained 25% or more adolescent clients. Participants included seven females and three males; nine participants identified as Caucasian, and one participant identified as Hispanic. Participants ages ranged from 39-61. I analyzed the data, along with two research partner, according to Grounded Theory (GT) methodology. Through constant comparative analysis, a grounded theory emerged from the data in which participants converged understanding of client safety, relationships, clinical intuition in a process of integrated experience and consultation. With the exception of mandated reported and mortal danger, ethical guidelines and laws did not seem to factor into participants' decision making. Implications for counseling practice, preparation, and research are provided.
Virtual Entrepreneurship: Explicating the Antecedents of Firm Performance
Access: Use of this item is restricted to the UNT Community.
Prior research has examined entrepreneurial businesses spatially located in the physical or offline context; however, recent radical information and technological breakthroughs allow entrepreneurs to launch their businesses completely online. The growth of the online business industry has been phenomenal. Predictions for worldwide online sales estimate it to reach $2 trillion in 2016. Virtual entrepreneurship refers to the pursuit and exploitation of opportunities via virtual platforms. Web 2.0 cybermediaries offer web-based platforms that function similarly to traditional intermediaries in a virtual setting and minimize barriers to entry for virtual entrepreneurial firms. The use of such cybermediaries with increasing success suggests an implicit shift in the dominant logic that typically underpins the functioning of entrepreneurial firms operating in the physical world. In this relatively uncharted territory, marked by a focus on profit, cooperation, collaboration and community, three ideal-type institutional logics i.e. Market, Corporation and Community, blend together. It is posited that a Virtual Entrepreneurial Logic guides the norms, behaviors, and practices of entrepreneurial firms operating via these virtual platforms. This raises the question whether the blending of three ideal-type logics leads to the existence of different antecedents of performance. A business model antecedent addressing the economic dimension, a community antecedent addressing the community dimension and a co-creation antecedent addressing the collaborative dimension of the Virtual Entrepreneurial Logic were therefore empirically examined in this study. Thus, three research questions were investigated to explicate the antecedents. Primary data from 1396 virtual entrepreneurial firms was collected (business model antecedent n=366, community antecedent n=732 and co-creation antecedent n= 298) to test the proposed hypotheses. Results provided support for the three antecedents. This study makes important theoretical and practical contributions to understanding the domain of virtual entrepreneurship from a blended logics perspective. Using the theoretical lens provided by institutional logics helps shed light on the pivotal role played by cybermediary platforms in the Web 2.0 context. The primary role of synergistic effects, cooperative behavior, and collaboration have important implications for virtual entrepreneurship. Findings also contribute to other related streams in entrepreneurship such as microenterprises. The study offers theoretical extensions of prior work on co-creation to virtual small entrepreneurial ventures. From a practical standpoint, insights can help entrepreneurs to better understand and leverage performance drivers in virtual contexts in general and on cybermediary platforms in particular.
Strange Matter, Strange Objects: An Ontological Reorientation of the Philosophical Concept of Wonder
Wonder has had a rich and diverse history in the western philosophical tradition. Both Plato and Aristotle claim that philosophy begins in wonder, while Descartes marks it as the first of the passions and Heidegger uses it as a signpost for a new trajectory of philosophy away from idealism and nihilism. Despite such a rich history, wonder is almost always thought to be exhausted by the acquisition of knowledge. That is, wonder is thought of almost exclusively in epistemological terms and is discarded as soon as knowledge has been achieved. In this dissertation, I argue for an ontological reorientation of wonder that values wonder beyond its epistemic uses. To do this, I read the phenomenological and ontological work of Maurice Merleau-Ponty through recent developments in object-oriented ontology and new materialism. Much of Merleau-Ponty's work is directed toward dissolving the distinction between subject and object. His insights regarding the mutual constitution of the world lead to the possibility of an operative wonder that occurs between subject and object. Both object-oriented ontology and new materialism radicalize these insights by articulating them in terms of a vibrant or quasi-agential material world. Objects and assemblages of objects are capable of performing the becoming of the world that includes human activity, but is not reduced to it. As such, the world is capable of both self-organization and practice. Ultimately I use the philosophy-physics of Karen Barad to argue that operative wonder acts like a kind of superposition of relations between objects, and thereby accounts for a concept of wonder that is both ontologically significant and acutely generative.
A Comparison of Methods for Sight-Reading Utilizing Collegiate Saxophonists
The ability to sight-read well is held as a highly regarded and important skill in music performance and education. Over the past 90 years, researchers have investigated several aspects of music sight-reading, especially those attributes possessed by skilled sight-readers. A significant and recurrent finding from this body of research is the relationship between sight-reading and rhythm recognition. Though these studies have found positive effects and correlations between rhythm recognition and sight-reading, they have been limited and indirect. The aim of this dissertation was to investigate the effects of (a) practicing rhythms on a single pitch and (b) practicing rhythms with full-range scales and their direct effects on sight-reading ability in saxophonists at the college level. The primary objective in this research was to determine if one method was more effective than another in developing sight-reading skills. The participants (N = 74) consisted of college students who were enrolled in saxophone lessons at a university in the southwestern United States. Participants were administered a sight-reading pre-test at the beginning of an 8-week treatment period. After pre-testing, students were blocked into two groups. The first treatment group was assigned to practice rhythms on a single pitch and the second treatment group was assigned to practice rhythms combined with full-range major scales. After the treatment period, participants were administered a sight-reading post-test. A 2-way mixed ANOVA was used to determine if there were differences between treatment groups, differences from pre-test to post-test, and if there was a significant interaction between treatment and time. There was no significant difference between treatment groups, F (1, 72) = .035, p = .852, partial η2 = .000028. There was a significant effect for time, indicating that both treatment groups improved from pre-to post test, F (1, 72) = 83.499, p < .001, partial η2 = .537. There was no significant interaction between treatment and time, F (1, 72) = .322, p = .572, partial η2 = .004.
The Evolution of the Improvisational Vocabulary of Marc Johnson
This study examines the evolution of the improvisational vocabulary utilized by bassist Marc Johnson over the course of his career. Through interviews and musical analysis the study contextualizes Johnson’s musical influences, considers how they shaped his development, and examines his role in the legacy of the stylistic lineage established by Scott LaFaro with the Bill Evans Trio. A survey of literature concerning Johnson, Scott LaFaro and Eddie Gomez is included, as well as a discussion of the impact of apprenticeship on Johnson’s career. The study illuminates aspects of Johnson’s current vocabulary and how he has synthesized influences to create a distinctive vocabulary, not derivative of Scott LaFaro or Eddie Gomez, but incorporating elements of their style in the composition of his own voice.
An Analysis of Educational Technology Publications: Who, What and Where in the Last 20 Years
This exploratory and descriptive study examines research articles published in ten of the top journals in the broad area of educational technology during the last 20 years: 1) Educational Technology Research and Development (ETR&D); 2) Instructional Science; 3) Journal of the Learning Sciences; 4) TechTrends; 5) Educational Technology: The Magazine for Managers of Change in Education; 6) Journal of Educational Technology & Society; 7) Computers and Education; 8) British Journal of Educational Technology (BJET); 9) Journal of Educational Computing Research; and 10) Journal of Research on Technology in Education. To discover research trends in the articles published from 1995-2014, abstracts from all contributing articles published in those ten prominent journals were analyzed to extract a latent semantic space of broad research areas, top authors, and top-cited publications. Concepts that have emerged, grown, or diminished in the field were noted in order to identify the most dominant in the last two decades; and the most frequent contributors to each journal as well as those who contributed to more than one of the journals studied were identified.
The Recorded Legacy of Enrico Caruso and its Influence on the Italian Vocal Style
This dissertation presents evidence for the influence which tenor Enrico Caruso had on the Italian Vocal Tradition. This impact was clearly boosted by the revolution realized in the fledgling recording industry, and the recordable disc. In the years of 1902-1920 gramophones became commonplace, and collecting recordings became an interest for many. This new technology required specialized skills, and was especially suited to certain qualities of voice. Caruso enjoyed immense success in this medium, in recording over 250 records. Italian vocal style at the turn of the century was changing, and Caruso employed a new "modern" style in his singing. His interpretive decisions, vocal method, and repertoire which he championed had an impact on the vocal tradition of future generations. Comparison of his recordings with tenors Fernando de Lucia, Giuseppe Anselmi, and Alessandro Bonci shows a marked contrast in styles of "the old school" and Caruso's "more straightforward" approach. A collection of historical documents for those who succeeded him include many biographies, reviews, and quotes to demonstrate the extent of his influence. Recordings also show a movement toward "the Caruso Sound." Jussi Bjoerling, Franco Corelli, Richard Tucker, Mario Lanza, and Luciano Pavarotti were all influenced by the great Caruso. Almost 100 years have passed since he sang his last performance. He continues to inspire singers to this day, through his recordings and legacy passed on by many generations. He is the ideal, the measuring stick for all tenors to follow, and continues even to today.
Development of an Instrument to Measure the Level of Acceptability and Tolerability of Cyber Aggression: Mixed-Methods Research on Saudi Arabian Social Media Users
Access: Use of this item is restricted to the UNT Community.
Cyber aggression came about as a result of advances in information communication technology and the aggressive usage of the technology in real life. Cyber aggression can take on many forms and facets. However, the main focus of this study is cyberbullying and cyberstalking through information sharing practices that might constitute digital aggressive acts. Human aggression has been extensively investigated. Studies focusing on understanding the causes and effects that can lead to physical and digital aggression have shown the prevalence of cyber aggression in different settings. Moreover, these studies have shown strong relationship between cyber aggression and the physiological and physical trauma on both perpetrators and their victims. Nevertheless, the literature shows a lack of studies that could measure the level of acceptance and tolerance of these dangerous digital acts. This study is divided into two main stages; Stage one is a qualitative pilot study carried out to explore the concept of cyber aggression and its existence in Saudi Arabia. In-depth interviews were conducted with 14 Saudi social media users to collect understanding and meanings of cyber aggression. The researcher followed the Colaizzi’s methods to analyze the descriptive data. A proposed model was generated to describe cyber aggression in social media applications. The results showed that there is a level of acceptance to some cyber aggression acts due to a number of factors. The second stage of the study is focused on developing scales with reliable items that could determine acceptability and tolerability of cyber aggression. In this second stage, the researcher used the factors discovered during the first stage as source to create the scales’ items. The proposed methods and scales were analyzed and tested to increase reliability as indicated by the Cronbach’s Alpha value. The scales were designed to measure how acceptable and tolerable is cyber-bullying, cyber-stalking in Saudi Arabia and the sharing of some information in social media applications. The results show a strong tolerance level of those activities. This study is a valuable resource for advanced-level students, educators, and researchers who focus on cyber security, cyber psychology, and cyber aggression in social network sites.
Child Centered Play Therapy with Children Exhibiting Aggressive Behaviors
Aggressive behaviors in childhood currently serve as the leading cause of counselor referrals within the United States. Children exhibiting maladaptive aggressive symptomology are at an increased risk for highly externalized and problematic behaviors across the lifespan. Emotional self-regulation and empathy are two constructs currently believed to be closely related to aggression, but a lack of research exploring these variables currently exists in the counseling literature. In this study I examined the effect of child-centered play therapy (CCPT), is a manualized, developmentally responsive, and nondirective intervention, on these variables. Participants were 71 students from four Title 1 elementary schools in the southwest U.S. referred by teachers for aggressive behavior (12 females, 59 males; age range 5-10 years with mean age 6.28. The sample consisted of 52.1% (n = 37) children identified as African American, 21.1% (n = 15) as Latina/Latino, 19.7% (n = 14) as Caucasian, and 7% as multiracial (n = 5). Participants were randomly assigned to 8 weeks of a twice-weekly CCPT experimental group (n = 36) or a waitlist control group (n = 35). Results of descriptive discriminant analyses (DDA) of the Social Emotional Assets and Resilience Scale and the Children’s Aggression Scale scores revealed that parents perceived children’s group membership in CCPT as significant and reasonably predictive of improvement in children’s aggression, self-regulation, and empathy. However, teachers did not perceive a statistically significant difference between the two groups with respect to these variables. These results suggest the relevancy of CCPT for parents in providing children with a developmentally responsive intervention to reduce aggressive behaviors and support their healthy development.
With the Earth in Mind: Ecological Grief in the Contemporary American Novel
Access: Use of this item is restricted to the UNT Community.
"With the Earth in Mind" responds to some of the most cutting-edge research in the field of ecocriticism, which centers on ecological loss and the grief that ensues. Ecocritics argue that ecological objects of loss abound--for instance, species are disappearing and landscapes are becoming increasingly compromised--and yet, such loss is often deemed "ungrievable." While humans regularly grieve human losses, we understand very little about how to genuinely grieve the loss of nonhuman being, natural environments, and ecological processes. My dissertation calls attention to our society's tendency to participate in superficial nature-nostalgia, rather than active and engaged environmental mourning, and ultimately activism. Herein, I investigate how an array of postwar and contemporary American novels represent a complex relationship between environmental degradation and mental illness. Literature, I suggest, is crucial to investigations of this problem because it can reveal the human consequences of ecological loss in a way that is unavailable to political, philosophical, scientific, and even psychological discourse.