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22
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16
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477
Thresholds and Legacy Effects of Tropical Floodplain Fish Assemblages in Response to Flood Attributes
Natural flow regimes are critical for sustaining biodiversity and river integrity. Floods and droughts form an important component of river systems and control population sizes and species diversity across space and time. Modification of flow regimes, including disruption of the timing, magnitude and duration of flooding, is a global problem, and many new impoundments are planned for large river-floodplain ecosystems in the tropics. Flow modifications may cause dramatic non-linear responses in population sizes and have lasting effects through time, but such topics are poorly investigated over multi-year scales, especially in highly diverse tropical ecosystems. Using a long-term dataset from the Upper Paraná River floodplain, Brazil, I tested for threshold and legacy effects of fish assemblages to flood attributes, such as timing, magnitude, duration, rate of change and variation. Specifically, I hypothesized that long duration, high magnitude floods would elicit threshold responses in long-distance migratory fish species and these responses result in significant legacy effects detectable over multiple years. Consistent positive threshold responses to increasing flood duration and magnitude were detected for many species and not significantly correlated with reproductive guilds. Legacy effects were prevalent (i.e. identified for more than 90% of species) and including flood attributes from previous years increased …
Date:
December 2015
Creator:
Hoeinghaus, Ana Paula Ferrari
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Time Series Data Analysis of Single Subject Experimental Designs Using Bayesian Estimation
This study presents a set of data analysis approaches for single subject designs (SSDs). The primary purpose is to establish a series of statistical models to supplement visual analysis in single subject research using Bayesian estimation. Linear modeling approach has been used to study level and trend changes. I propose an alternate approach that treats the phase change-point between the baseline and intervention conditions as an unknown parameter. Similar to some existing approaches, the models take into account changes in slopes and intercepts in the presence of serial dependency. The Bayesian procedure used to estimate the parameters and analyze the data is described. Researchers use a variety of statistical analysis methods to analyze different single subject research designs. This dissertation presents a series of statistical models to model data from various conditions: the baseline phase, A-B design, A-B-A-B design, multiple baseline design, alternating treatments design, and changing criterion design. The change-point evaluation method can provide additional confirmation of causal effect of the treatment on target behavior. Software codes are provided as supplemental materials in the appendices. The applicability for the analyses is demonstrated using five examples from the SSD literature.
Date:
August 2015
Creator:
Aerts, Xing Qin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Tonality and the Extended Common Practice in the Music of Thad Jones
Tonality is a term often used to describe the music of the common practice period (roughly 1600-1900). This study examines the music of mid twentieth-century jazz composer Thad Jones in light of an extended common practice, explicating ways in which this music might be best understood as tonal. Drawing from analyses of three of Jones’s big band compositions: To You, Three and One, and Cherry Juice, this study examines three primary elements in detail. First is Jones’s use of chord-scale application techniques in the orchestration over various chordal qualities represented by the symbols, revealing traditional as well as innovative methods by Jones. Second is Jones’s use of harmonic progressions, demonstrating his connection to past practice as well as modern jazz variations. Third is Jones’s use of contrapuntal connections and their traditional relationship to functional tonality, but in a chromatic scale-based environment. Jones’s music is presented in this study to demonstrate a tonal jazz common practice that represents an amalgamation of traditions including twentieth-century scale-based procedures, Renaissance and early twentieth-century modality, eighteenth- and nineteenth-century voice leading schemas, and Baroque and Classical descending-fifth progressions. Also included as an appendix is a list of possible note errors in the published scores of To …
Date:
May 2015
Creator:
Rogers, Michael A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Traditional Bullying and Cyberbullying in Korean Children and Youth with Emotional and Behavioral Disabilities: Examination of Contributing Factors
Children and Adolescents with emotional and behavioral disabilities (EBD) are often involved in aggression, acting out, bullying, violence, substance abuse, and juvenile crime. However, the limited Korean studies have focused primarily on bullying of students with developmental disabilities or intellectual disabilities. Therefore, the current study aimed to explore contributing factors to traditional bullying and cyberbullying in Korean children and adolescents with EBD. The current study surveyed 112 students with EBD between ages of 10 and 15 and their parents (guardians). The results revealed that internalizing problem behaviors including anxious/depression, withdrawal/depression, and somatic problems significantly affected traditional bullying victimization of Korean students with EBD. The peer support was a significant factor affecting cyberbullying victimization. Furthermore, the maternal psychological control was a meaningful factor affecting perpetration at school and in cyber world. Based on the findings, the present study described implications regarding prevention and intervention programs for addressing traditional bullying and cyberbullying victimization and perpetration.
Date:
August 2015
Creator:
Baek, Ji Eun
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Trajectory Analytics
The numerous surveillance videos recorded by a single stationary wide-angle-view camera persuade the use of a moving point as the representation of each small-size object in wide video scene. The sequence of the positions of each moving point can be used to generate a trajectory containing both spatial and temporal information of object's movement. In this study, we investigate how the relationship between two trajectories can be used to recognize multi-agent interactions. For this purpose, we present a simple set of qualitative atomic disjoint trajectory-segment relations which can be utilized to represent the relationships between two trajectories. Given a pair of adjacent concurrent trajectories, we segment the trajectory pair to get the ordered sequence of related trajectory-segments. Each pair of corresponding trajectory-segments then is assigned a token associated with the trajectory-segment relation, which leads to the generation of a string called a pairwise trajectory-segment relationship sequence. From a group of pairwise trajectory-segment relationship sequences, we utilize an unsupervised learning algorithm, particularly the k-medians clustering, to detect interesting patterns that can be used to classify lower-level multi-agent activities. We evaluate the effectiveness of the proposed approach by comparing the activity classes predicted by our method to the actual classes from the …
Date:
May 2015
Creator:
Santiteerakul, Wasana
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Transfer From a UTeach Replication Site to the Classroom: A Study of First and Second Year Instructional Practices
Concerns based adoption model (CBAM) instruments were used to examine instructional practices of six graduates from a highly stylized, inquiry-based secondary math and science preparation program. Teachers were in the first or second years of teaching mathematics in six different secondary settings, ranging from poverty to wealthy schools. CBAM assumptions were tested. The primary assumption about concerns was that new teachers’ highest concerns would be within the self and task dimensions. According to Hall and Hord, it was assumed that the levels of use are typically in the orientation and preparation stages as a new teacher begins to implement an innovation, in the case of this study, inquiry-based instruction. All three instruments of the CBAM model were used for data collection and included: the Survey of Concerns Questionnaire, Innovation Components Configuration Map, and Levels of Use matrix. Teachers were observed, interviewed, and surveyed, three times each, across a five-month period. The findings from this study showed that the teachers had similar concerns and levels of use, which supported the assumptions outlined by the CBAM principles. Across the six teachers, the self and task concerns were high, aligning with the assumptions. However, unrelated and impact dimensions were noted, in opposition to …
Date:
May 2015
Creator:
Fields, Melanie
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Trees and Ordinal Indices in C(K) Spaces for K Countable Compact
In the dissertation we study the C(K) spaces focusing on the case when K is countable compact and more specifically, the structure of C() spaces for < ω1 via special type of trees that they contain. The dissertation is composed of three major sections. In the first section we give a detailed proof of the theorem of Bessaga and Pelczynski on the isomorphic classification of C() spaces. In due time, we describe the standard bases for C(ω) and prove that the bases are monotone. In the second section we consider the lattice-trees introduced by Bourgain, Rosenthal and Schechtman in C() spaces, and define rerooting and restriction of trees. The last section is devoted to the main results. We give some lower estimates of the ordinal-indices in C(ω). We prove that if the tree in C(ω) has large order with small constant then each function in the root must have infinitely many big coordinates. Along the way we deduce some upper estimates for c0 and C(ω), and give a simple proof of Cambern's result that the Banach-Mazur distance between c0 and c = C(ω) is equal to 3.
Date:
August 2015
Creator:
Dahal, Koshal Raj
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Tubas on the Rise: the Tuba As a Signifier of 21st Century Mexican-American Music Culture in Southern California
Banda is a rural Mexican brass band genre from the state of Sinaloa that became popular among immigrant populations of Los Angeles in the 1990s. In contemporary banda, the tuba has acquired a more prominent role than it held in traditional banda. The tuba has shifted from the traditional background harmonic and rhythmic function to a significant and new placement with the front line melodic instruments. The focus on tubas in modern incarnations of banda has helped it become a staple in acoustic and accordion genres such as sierreña and norteña. In many Mexican-American regional ensembles, the prominence of the tuba and its placement within the group represents a shift in its cultural significance, a stronger connection to the Mexican history and cultural roots, in the Mexican-American music community of southern California. This paper uncovers some of the motives and significance behind these recent changes in the role of the tuba in Mexican-American regional genres as well as the cultural connection that the tuba provides for Mexican-Americans in southern California to traditional Mexican music culture.
Date:
August 2015
Creator:
Orth, Jesse
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Understanding 3-D Spaces Through Game-based Learning: a Case Study of Knowledge Acquisition Through Problem-based Learning in Minecraft
The primary purpose in this case study was to explore the use of three-dimensional virtual spaces via the use of the game Minecraft as a teaching tool. The case study examined the effectiveness, self-efficacy, and social interaction of students when using such a tool in the teaching and learning process. The research analyzed knowledge acquisition through various deliverables such as benchmark pre and post exams, student discourse, and tangible objects created from the lessons by the students. Students were enrolled and participated in a summer camp offered from Arts and Technology Institute in North Texas. The camp utilized Minecraft to teach architecture types. Students learned about pyramids (Egyptian and Aztec), Roman/Greek architecture, Gothic architecture, and Post-Modern Architecture. Each day students were exposed to a different them of architecture and were tasked with building a world that was in the theme of an assigned type of architecture. Fifty-nine school age students ranging in ages from eight to twelve years old participated fully in the study. The students were not grouped by age, but instead self-selected partners with which to work during the course of their creations. Results show that students who participated in the Minecraft driven course were highly engaged and …
Date:
August 2015
Creator:
Roberts-Woychesin, Jami
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Understanding Microbial Biodegradation of Environmental Contaminants
The accumulation of industrial contaminants in the natural environments have rapidly become a serious threat for human and animal life. Fortunately, there are microorganisms capable of degrading or transforming environmental contaminants. The present dissertation work aimed to understand the genomic basis of microbial degradation and resistance. The focus was the genomic study of the following bacteria: a) Pseudomonas fluorescens NCIMB 11764, a unique bacterium with specific enzymes that allow cyanide adaptation features. Potential cyanide degradation mechanisms found in this strain included nit1C cluster, and CNO complex. Potential cyanide tolerance genes found included cyanide insensitive oxidases, nitric oxide producing gene, and iron metabolism genes. b) Cupriavidus sp. strain SK-3 and strain SK-4. The genome of both bacteria presented the bph operon for polychlorinated biphenyl (PCB) degradation, but we found differences in the sequences of the genes. Those differences might indicate their preferences for different PCB substrates. c) Arsenic resistant bacterial communities observed in the Atacama Desert. Specific bacteria were found to thrive depending on the arsenic concentration. Examples were Bacteroidetes and Spirochaetes phyla whose proportions increased in the river with high arsenic concentrations. Also, DNA repair and replication metabolic functions seem to be necessary for resistance to arsenic contaminated environments. Our …
Date:
May 2015
Creator:
Vilo Muñoz, Claudia Andrea
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Unethical Prosocial Behavior: Theory Development and Experimental Findings
Job performance has historically been divided into two subsets, that which is prescribed and that which is discretionary. Further, discretionary workplace behavior has typically been described as either helpful or ethical (i.e. organizational citizenship behavior) or harmful and unethical (i.e. workplace deviance behavior) with behavior that is both helpful and unethical rarely discussed. I term this lesser discussed type of discretionary workplace behavior unethical prosocial behavior and define it as discretionary actions that are intended to benefit a specific referent outside the self, either an individual or a group, that are illegal and/or morally inappropriate to larger society. In addition to defining unethical prosocial behavior, this paper places the behavior in an organizing framework of discretionary workplace behaviors and tests several hypotheses regarding unethical prosocial behavior. The hypotheses address three primary research questions. First, are there contextual conditions that make it more likely that a person will engage in unethical prosocial behavior? Second, does the nature of the relationship between the actor and the beneficiary make unethical prosocial behavior more or less likely? And third, are there individual characteristics that serve to either constrain or enhance the likelihood that and individual will engage in unethical prosocial behavior? A 2 x …
Date:
August 2015
Creator:
Herchen, Julia L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Urban Sustainability and the Extinction of Experience: Acknowledging Drivers of Biocultural Loss for Socio-ecological Well-being
In this dissertation I address urban sustainability with a focus on loss of cultural heritage and ecological knowledge by expanding the concept “extinction of experience” (EoE). Conceptualized by conservationist Robert Michael Pyle, EoE is the loss of nature experiences leading to apathy towards biodiversity and degradation of the common habitat. I expand upon Pyle’s formulation of the concept by considering the EoE cycle as an indirect driver that amplifies biodiversity losses. Additionally, I introduce the analysis of interrelated losses of biological and cultural diversity in relation to EoE. With a biocultural approach I discuss that EoE is tied to the infrastructural inertia within the global urban economy. I propose that addressing the EoE cycle is critical in that as a complex and multi-faceted process, it cements threats to biological and cultural diversity as permanent fixtures within society by obscuring their significance in light of economic development. This cycle remains a hidden problematic in that it perpetuates the environmental crisis while making such losses invisible within day-to-day lifestyle habits, constructing an emerging urban culture within the global economy that is ignorant of ecological processes and sustainability requirements. I frame the implications of EoE with an analysis of the newly proposed revisions …
Date:
December 2015
Creator:
Poole, Alexandria K.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Using Your Imagination to Pursue Goals: Diminishing the Effects of Visceral Temptations
Consumers consistently set goals for themselves. Despite good intentions, consumers often deviate from their goals. If consumers understand the benefits that arise from goal success, then why do most consumers fail to accomplish goals? Often, temptations are more appealing than achievement of goals; temptations are tangible while the benefits of a goal are difficult to grasp. An individual who uses his/her imagination to visualize goal success makes the goal more present-minded and attainable (Oettingen 2000). Thus, imagination facilitates self-efficacy, the belief in one’s ability to reach a goal. Higher self-efficacy, then, provides an individual with the willpower to achieve a goal (Taylor, Pham, Rivkin, and Armor 1998). Whereas previous work has examined temptations’ relationship with goals (e.g. Fedorikhin and Patrick 2010; Wilcox, Vallen, Block, and Fitzsimons 2009; Zhang, Huang, and Broniarczyk 2010; etc.), the scope of this dissertation study differs. Rather, the research aim is to identify how consumers can overcome visceral temptations. Thus, the main objectives include: contributing new perspectives on goal research by merging the literatures on imagination and visceral cues, outlining how imagination regulates the impact of visceral temptations, and identifying the underlying mechanism that explains how imagination regulates the relationship between visceral cues and ad-evoked thoughts, …
Date:
August 2015
Creator:
Cowan, Kirsten
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Václav Philomathes’ Musicorum Libri Quattuor (1512): Translation, Commentary, and Contextualization
The Czech-born music theorist, Václav Philomathes, wrote the Musicorum libri quattuor in 1512 while attending the University of Vienna. This didactic treatise became one of the most widely published theory treatise of its time with 26 copies of five editions remaining today and covers the topics of Gregorian chant practice, Solmization, Mensural Notation, Choir Practice and Conducting, and Four-voice Counterpoint. Of particular note, is the section on choir practice and conducting, of which there is no equivalent prior example extant today. This dissertation provides a Latin-English translation of Philomathes’s work, as well as produces a critical commentary and comparison of the five editions while positioning the editions within the context of the musico-theoretical background of early-to-mid-16th century scholarship in Central Europe.
Date:
December 2015
Creator:
Iler, Devin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Vanishing Act
This dissertation is comprised of a collection of poems preceded by a critical preface. The preface reconsiders the value of discontinuous poetic forms and advocates a return to lyric as an antidote to the toxic aspects of what Tony Hoagland terms “the skittery poem of our moment.” I consider poems by Wendy Xu, Kevin Prufer, Sharon Olds, and Stephen Dunn in depth to facilitate a discussion about the value of a more centrist position between the poles of supreme discontinuity and totalizing continuity. Though poets working in discontinuous forms are rightly skeptical of the hierarchies that govern narrative and linear forms, as Czesław Miłosz notes in The Witness of Poetry, “a poet discovers a secret, namely that he can be faithful to real things only by arranging them hierarchically.” In my own poems, I make use of the hierarchies of ordered perception in lyric and narrative forms to faithfully illuminate the collapsed structures of my own family history in the shadow of Detroit. I practice the principles I advocate in the preface, using a continuous form to address fractured realities in a busy, disordered age when poets often seek forms as fragmented as their perceptions. These poems are distinctly American, …
Date:
May 2015
Creator:
Pryor, Caitlin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Variational Calculations of Positronium Scattering with Hydrogen
Positronium-hydrogen (Ps-H) scattering is of interest, as it is a fundamental four-body Coulomb problem. We have investigated low-energy Ps-H scattering below the Ps(n=2) excitation threshold using the Kohn variational method and variants of the method with a trial wavefunction that includes highly correlated Hylleraas-type short-range terms. We give an elegant formalism that combines all Kohn-type variational methods into a single form. Along with this, we have also developed a general formalism for Kohn-type matrix elements that allows us to evaluate arbitrary partial waves with a single codebase. Computational strategies we have developed and use in this work will also be discussed.With these methods, we have computed phase shifts for the first six partial waves for both the singlet and triplet states. The 1S and 1P phase shifts are highly accurate results and could potentially be viewed as benchmark results. Resonance positions and widths for the 1S-, 1P-, 1D-, and 1F-waves have been calculated.We present elastic integrated, elastic differential, and momentum transfer cross sections using all six partial waves and note interesting features of each. We use multiple effective range theories, including several that explicitly take into account the long-range van der Waals interaction, to investigate scattering lengths for the 1,3S …
Date:
December 2015
Creator:
Woods, Denton
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Video Analytics with Spatio-Temporal Characteristics of Activities
As video capturing devices become more ubiquitous from surveillance cameras to smart phones, the demand of automated video analysis is increasing as never before. One obstacle in this process is to efficiently locate where a human operator’s attention should be, and another is to determine the specific types of activities or actions without ambiguity. It is the special interest of this dissertation to locate spatial and temporal regions of interest in videos and to develop a better action representation for video-based activity analysis. This dissertation follows the scheme of “locating then recognizing” activities of interest in videos, i.e., locations of potentially interesting activities are estimated before performing in-depth analysis. Theoretical properties of regions of interest in videos are first exploited, based on which a unifying framework is proposed to locate both spatial and temporal regions of interest with the same settings of parameters. The approach estimates the distribution of motion based on 3D structure tensors, and locates regions of interest according to persistent occurrences of low probability. Two contributions are further made to better represent the actions. The first is to construct a unifying model of spatio-temporal relationships between reusable mid-level actions which bridge low-level pixels and high-level activities. Dense …
Date:
May 2015
Creator:
Cheng, Guangchun
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Was There a Trumpet Sonata Before the Trumpet Sonata? an Investigation of Girolamo Fantini’s Trumpet Sonatas with Respect to Other Stile Moderno Solo Instrumental Sonatas
In 1638 Girolamo Fantini wrote eight multi-sectional trumpet sonatas. This dissertation compares these sonatas with recognized stile moderno solo instrumental sonatas by Biagio Marini and Dario Castello in order to show that Fantini’s sonatas are stile moderno trumpet sonatas. This study looks at how form, texture, motivic organization, and instrumental effects function in the works of Castello, Marini, and Fantini. This comparison shows how and to what degree Fantini uses stile moderno characteristics in his works and concludes that Fantini’s sonatas are full-fledged examples of stile moderno trumpet sonatas.
Date:
August 2015
Creator:
Stoltzfus, Andreas M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
What Did the Client Say? Auditor Memory of a Client Inquiry: a Study of Encoding Style and Note Taking
Client inquiry is a fundamental procedure for gathering audit evidence. Since inquiries are not audio- or video-recorded in practice, auditor memory is vital to the accuracy of evidence gathered in this manner. Due to the potential for error during memory encoding and retrieval, the effect of memory on judgment, and the cognitive complexity of conducting a face-to-face inquiry, examining factors affecting auditor memory of client inquiries is important. In this dissertation, I examine two factors likely to affect auditor memory of a client inquiry. First, encoding style is a low-level cognitive function representing how much stimuli an individual perceives before applying prior knowledge (schemata) to assist with encoding to long-term memory, affecting information noticed and remembered. Differences in auditors’ encoding style may explain variance in memory accuracy of evidence gathered from a client inquiry. Second, audit professionals often make hand-written or typed notes during client inquiries, and subsequently review the notes, which may affect memory. To address these issues, I first gather interview evidence from six professional auditors to determine how practicing auditors plan, prepare for, conduct, and document evidence from client inquiries. I then develop and execute a video-based experiment with 33 senior auditor participants, 23 masters-level accounting students, …
Date:
May 2015
Creator:
Vinson, Jeremy M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
“Wolf Man”
This creative nonfiction dissertation is a memoir that probes the complex life and death of the author’s father, who became addicted in his late forties to crack cocaine. While the primary concerns are the reasons and ways in which the father changed from a family man into a drug addict, the memoir is also concerned with themes of family life, childhood, and grief. After his father’s death, the author moves to Las Vegas and experiences similar addiction issues, which he then explores to help shed light on his father’s problems. To enrich the investigation, the author draws from eclectic sources, including news articles, literature, mythology, sociology, religion, music, TV, interviews, and inherited objects from his father. In dissecting the life of his father, the author simultaneously examines broader issues surrounding modern fatherhood, such as cultural expectations, as well as the problems of emptiness, isolation, and spiritual deficiency.
Date:
August 2015
Creator:
Flanagan, Ryan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Women and the Superintendency: a Study of Texas Women Superintendents
Education remains one of the most gender imbalanced fields, with disproportionately fewer women in higher levels of leadership. Women who reach leadership positions in education experience many triumphs and tribulations during their tenures as principals, assistant superintendents, and superintendents. The experiences of these women in their various administrative levels of leadership can provide important insight into the reasons for their success as women superintendents in Texas. This research has probed the career trajectory of nine women who have successfully attained and retained superintendencies in Texas to determine what career decisions have helped them and the challenges these women have faced in their positions. A qualitative research method, open-ended interviews, yielded several findings of what women considered important in proceeding from teaching through the various levels and ending in becoming superintendents. According to nine successful women superintendents in Texas, there are specific characteristics one can bring to the table that would really make a difference: Communication, collaboration, compassion, preparedness, hard work, and passion. All nine participants overcame challenges when climbing to the higher levels of leadership in education. These women have achieved success in the superintendency, and several factors appear to have played into the success of these women who have …
Date:
August 2015
Creator:
Guajardo, Lesli Ann
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library