You limited your search to:

  Partner: UNT Libraries
 Language: English
Keeping Human Resources happy: Improving hiring processes through the use of rubrics
Article on keeping human resources happy and improving hiring processes through the use of rubrics. digital.library.unt.edu/ark:/67531/metadc407875/
Piloting a Peer-to-Peer Process for becoming a Trusted Digital Repository
Presentation for the 2014 Digital Library Federation (DLF) Annual Forum. This presentation discusses a pilot project by the University of North Texas and the University of Florida to develop a peer-to-peer process for becoming a Trusted Digital Repository. digital.library.unt.edu/ark:/67531/metadc407884/
Unity in Diversity, ETDs at UNT: and a look towards BibFrame
Presentation for the 2014 Texas Music Library Association Fall Meeting. This presentation discusses electronic theses and dissertations (ETDs) at the University of North Texas (UNT) and BibFrame. digital.library.unt.edu/ark:/67531/metadc407871/
Development of a portal to Texas history
Article discussing the development of the University of North Texas (UNT) Libraries' Portal to Texas History. digital.library.unt.edu/ark:/67531/metadc407883/
Barriers to Adopting PREMIS in Cultural Heritage Institutions: An Exploratory Study
Paper for the 2009 IS&T Archiving Conference. This paper discusses an exploratory study on barriers to adopting PREMIS in cultural heritage institutions. digital.library.unt.edu/ark:/67531/metadc407878/
MYB5 and MYB14 Play Pivotal Roles in Seed Coat Polymer Biosynthesis in Medicago truncatula
Article discussing MYB5 and MYB14 playing pivotal roles in seed coat polymer biosynthesis in Medicago truncatula. digital.library.unt.edu/ark:/67531/metadc407865/
Transforming an Academic Library from a Traditional Service Model to a Community Partner
Presentation for the 2014 Entrepreneurial Librarians Conference. This presentation discusses transforming an academic library from a traditional service model to a community partner. digital.library.unt.edu/ark:/67531/metadc407864/
Economics: From the Dismal Science to the Moral Science: The Moral Economics of Kendall P. Cochran
Adam Smith published The Theory of Moral Sentiments in 1759 and established the ethical foundation for The Wealth of Nations (1776) as well as the important role played by custom and fashion in shaping behaviors and outcomes. Kendall P. Cochran believed in Smith’s emphasis on value-driven analysis and seeking solutions to major problems of the day. Cochran believed that economists moved too far in the direction of analysis free of words like ought and should and devoted his career to establishing that economics is a moral science. A recent study by two Harvard professors, Carmen Reinhart and Kenneth Rogoff, Growth in a Time of Debt (2010), asserted that healthy economic growth and high levels of government debt are incompatible. These conclusions are associated with the austerity movement, which calls for policymakers to reduce government spending in order to reduce the government’s debt and improve long-term growth prospects. The austerity movement has been used to justify the sharp decline in public sector employment that has restrained job growth since the recession of 2007. In 2013, a graduate student named Thomas Herndon discovered an error in the calculations of Reinhart and Rogoff, publishing his findings in a paper co-authored by his professors, called "Does High Public Debt Consistently Stifle Economic Growth? A Critique of Reinhart and Rogoff." These findings call the entire austerity movement into question, causing many to reconsider the current obsession with reducing the government debt during a time of economic stagnation. Cochran would have held a celebration to toast Herndon and his professors for their work, not only for the sake of technical accuracy, but also because the policy prescriptions associated with the austerity movement are misguided and harmful to the unemployed and underemployed during times of economic hardship. Cochran’s articles are significant at this time because he is able to argue persuasively that economists have a moral obligation to provide policy recommendations that are consistent with a social agenda of fairness and opportunity. While many agree with Adam Smith that individuals are motivated by self-interest, it does not follow that any action or policy that promotes an individual’s self-interest is therefore worthwhile or beneficial from society’s perspective. If a person is handsomely rewarded for placing a bomb in the city center, does the potential gain for that individual justify the harm to society? Cochran makes an eloquent case that economists must identify instances in which government policy can and should be used to protect and promote society’s well-being. digital.library.unt.edu/ark:/67531/metadc407882/
Collecting and Disseminating New Music: Originally Presented as "The Impact of Women in Music, New Composers Forum"
Paper contributed to the 2002 Bar Harbor Music Festival. This paper discusses collecting and disseminating new music and the impact of women in music. digital.library.unt.edu/ark:/67531/metadc407870/
Keeping it Real: A Comprehensive and Transparent Evaluation of Electronic Resources
Presentation slides from a pre-conference workshop at the 2014 Charleston Annual Library Conference. The workshop discusses a comprehensive and transparent evaluation of electronic resources. digital.library.unt.edu/ark:/67531/metadc407874/
“Sunken Monadnock”: a Composition for Flute, Clarinet, Bassoon, Violin, Violoncello, Electric Guitar, Piano, Percussion, Three Female Vocalists, and Computer
Sunken Monadnock is a scripted combination of three modular musical surfaces. The word “surface” is borrowed from Morton Feldman, who compared the aural surface of music to the canvases of the action painters of the American Abstract Expressionists, and contrasted it with the work’s subject, or organizational structure. Composers’ transition toward a focus on surface through indeterminate compositional techniques, according to Feldman, parallels the development of modernist abstract art. “Sunken Monadnock: Composing with Visual Metaphors” is a companion critical essay that takes the surface/subject metaphor as a starting point for analyzing Sunken Monadnock.Other visual metaphors that inspired Sunken Monadnock, and are discussed in the essay, include Shakir Hassan Al Said’s mystical semiotics, Jasper Johns’s crosshatch prints, and Wassily Kandinsky’s theory of abstraction. The circle and spiral, especially, play influential roles in Sunken Monadnock as reflected by musical applications of repetition, rotation, compression/rarefaction, and endlessness. The void in the circle’s center also comes into play. The nature of the work’s formal counterpoint requires an innovative approach to the score, which consists of five sections, each of which reflects a different approach to the aural surface (i.e., to the traversal of time). The two outer sections are traditionally scored, but the three sections in the middle—labeled “Surfaces” are played simultaneously by three subsets of the ensemble. The piece is approximately 22 minutes long. digital.library.unt.edu/ark:/67531/metadc407859/
A Comparison of Three Teacher Evaluation Methods and the Impact on College Readiness
Much attention in recent years has gone to the evaluation of teacher effectiveness, and some scholars have developed conceptual models to evaluate the effectiveness. The purpose of this study was to compare three teacher evaluation models – the Texas Professional Development Appraisal System (PDAS), the teacher index model (TI), and the value-added model (VAM) – to determine teacher effectiveness using student demographic and longitudinal academic data. Predictive data from students included economic disadvantage status, ethnicity, gender, participation in special education, limited English proficiency, and performance on Texas Assessment of Knowledge and Skills (TAKS). Data serving as dependent variables were scores from Scholastic Aptitude Test (SAT®) verbal/critical reasoning and mathematics. These data came from 1,714 students who were 9.7% Hispanic, 9.2% African American, and 81.2% White. The models were tested for 64 English language arts teachers and 109 mathematics teachers, using student examination scores from the SAT® verbal/critical reasoning and mathematics. The data were aligned for specific faculty members and the students whom they taught during the year of the study. The results of the study indicated that the TI and VAM explained approximately 42% of the variance in college entrance exam scores from the SAT® verbal/critical reasoning and mathematics (R2 = 0.418) across mathematics and English language arts teachers, whereas the TI model explained approximately 40% of the variance in the SAT® scores (R2 = 0.402). The difference, however, in the R-squared values between the VAM and the TI model was not statistically significant (t (169) = 1.84, p > 0.05), suggesting that both models provided similar results. The least effective model used to predict student success on college entrance exams was the PDAS, which is a state-adopted model currently in use in over 1,000 school districts in Texas, The teacher PDAS scores explained approximately 36% of the variance in student success on the SAT® (R2 = 0.359). The study provides school leadership with information about alternative methods of evaluating teacher effectiveness without difficult formulas or high costs associated with hiring statisticians. In addition, results indicate that the models vary significantly in the extent to which they can predict which teachers are most effective in preparing students for college. This study also emphasizes the critical need to provide teacher evaluations that align with student achievement on college entrance exams. digital.library.unt.edu/ark:/67531/metadc407840/
In Vitro Cortical Networks for Disease Modeling and Drug Evaluation
In translational research, disease models in preclinical studies are used as media for discovery of drugs or novel therapeutics. Development of in vitro models for various neurological diseases that enable efficient pharmacological or toxicological screening has been ongoing but challenging. Recognizing the potential benefit of in vitro disease models, dysfunctions in the cortical neuronal networks were induced to mimic the functional pathology of neurological symptoms using microelectrode arrays. Two different disease states – tinnitusand excitotoxicity – were investigated and discussed. In this model, pentylenetetrazol-induced increase in spontaneous firing rate and synchrony in the auditory cortical networks was used as correlate of tinnitus. Potential tinnitus treatment drugs from several different classes – including the novel class of potassium channel openers – were screened and quantified. The potentialtherapeutic values of these drugs were also discussed as the basis for drug repurposing. Functional excitotoxicity was induced by cisplatin (a cancer drug that causes neurological sideeffects) and glutamate (the major excitatory neurotransmitter). As proof-of-principle that the model may contribute to expediting the development of therapeutics, cisplatin excitotoxicity wasprevented by the antioxidant D-methionine, while glutamate excitotoxicity was prevented by ceftriaxone (a modulator of a glutamate reuptake transporter). In the latter part of the study, with results linking two of the screened drugs L-carnitine and D-methionine to GABAA receptor activation, it was demonstrated that this model not only served as an efficient drug-screening platform, but can be utilized to functionally investigate the underlying mechanism of drugs. Inaddition, several practical or conceptual directions for future studies to improve on this in vitro disease model are suggested. digital.library.unt.edu/ark:/67531/metadc407860/
Emerging Ed-tech and Accessibility
Recent developments in the field of education have led to a proliferation of educational technologies (or “ed-tech”), yet access to educational content for students with special needs remains a challenge. This research study aims to assess the current state of accessibility in emerging ed-tech and to identify barriers in enabling educational content to be born accessible. Detailed discussions with various ed-tech platforms revealed less of a need for technical tools, but a more prevailing need for knowledge and education around accessibility – what it means and how best to incorporate accessibility into their platforms. The more experienced teams advocate incorporating accessibility into product development right from the design phase, while the younger teams expressed challenges in navigating accessibility laws and the dire need for easy-to-follow guidelines and best practices. A detailed review of educators' content creation processes reveals multiple dependencies in the ecosystem of ed-tech where partnerships and compatibilities are crucial in enabling accessibility throughout the process. Likewise, an urgent need exists for increasing awareness of accessibility among instructors authoring educational content using emerging ed-tech. digital.library.unt.edu/ark:/67531/metadc407857/
Infinite Hallways: “Parabola Heretica” and Other Journeys
This creative thesis collects five fictional stories, as well as a critical preface entitled “Fractals and the Gestalt: the Hybridization of Genre.” The critical preface discusses genre as a literary element and explores techniques for effective genre hybridization. The stories range from psychological fiction to science fiction and fantasy fiction. Each story also employs elements from other genres as well. These stories collectively explore the concept of the other and themes of connection and ostracization. digital.library.unt.edu/ark:/67531/metadc407839/
Psychological Diversity Climate and Its Effects: the Role of Organizational Identification
Organizations have begun to focus heavily on diversity. As a result, organizations spend time and resources creating diversity policies and investing extensively in diversity training programs. While an abundance of research exists on demographic diversity, research has just begun to incorporate employees’ perceptions of diversity as an influential factor affecting organizationally relevant employee outcomes. Employees are a crucial reference in understanding whether organizations benefit from engaging in such actions. The purpose of this study is to examine the influence of diversity climate on employees’ organizational identification. Furthermore, I investigate how organizational identification mediates the relationship between diversity climate perceptions and outcomes including turnover intentions, job satisfaction, and organizational citizenship behavior. I refine our understanding by identifying personal characteristics that influence the diversity climate (PDC) – organizational identification (OID) relationship. This research offers several contributions to management literature and scholars as well as practitioners. First this study empirically examines the relationship between PDC and OID. This connection is important as it identifies the psychological mechanism linking PDC to subsequent outcomes as well as showing how positive climate perception can influence an employee’s sense of belonging. The second contribution is the in-depth identification of personal characteristics and their role in this relationship specifically, demographics, values, and attachment to demographic category. Individuals will differ in their beliefs and thus their attachment based on climate perceptions. Finally, this study links diversity climate to organizationally relevant outcomes through organizational identification. digital.library.unt.edu/ark:/67531/metadc407849/
An Examination of Innovations in Alexander Scriabin’s Late Etudes for Piano
Alexander Scriabin (1872-1915) stands as one of the most unconventional twentieth-century Russian composers, particularly with respect to his piano works. The overwhelming majority of Scriabin's compositions—sixty-seven of his seventy-four published works—were written for solo piano. His etudes from 1905 forward are revolutionary, especially compared with his earlier Chopinesque style. Among Scriabin’s twenty-six etudes, his Op.49, No. 1 (1905), Op.56, No. 4 (1908) and the last three etudes of Op.65 (1912) date from his last period of composition. In the Op.49 etude, Scriabin started to abandon traditional tonality. He omitted the key signature altogether in the Op.56 etude. The final three etudes of Op.65 feature constant dissonances on ninths, sevenths and fifths. Alexander Scriabin’s last five etudes represent the culmination of his compositional development and innovations at the piano. Several factors coalesce in these etudes, including unusual harmony, bichords, non-tonal hierarchy, and structural symmetry. Most of these factors derive in some fashion from Scriabin’s increasing reliance upon the so-called “mystic chord” in his late works. This study will illustrate how Scriabin explored new sonorous and aesthetic ideas in his late etudes by means of these innovations. digital.library.unt.edu/ark:/67531/metadc407854/
Titanium Boride Formation and Its Subsequent Influence on Morphology and Crystallography of Alpha Precipitates in Titanium Alloys
Over the last two decades there has been an increased interest in understanding the influence of trace boron additions in Ti alloys. These additions refine the prior β grain size in as-cast Ti alloys along with increasing their modulus and yield strength due to the precipitation of TiB. TiB also acts as a heterogeneous nucleation site for α precipitation and has been shown to influence the α phase morphology. B is completely soluble in liquid Ti but has a negligible solubility in both body centered cubic β and hexagonal close packed α phases of Ti. Thus, during solidification of hypoeutectic B containing alloys, B is rejected from β into the liquid where it reacts with Ti to form pristine single crystal whiskers of TiB. Despite a substantial amount of reported experimental work on the characterization of TiB precipitates, its formation mechanism and influence on α phase precipitation are still not clear. The current work is divided into two parts – (i) understanding the mechanism of TiB formation using first principles based density functional theory (DFT) calculations and (ii) elucidating how TiB influences the α phase morphology and crystallography in titanium alloys using electron microscopy techniques. TiB exhibits anisotropic growth morphology with [010] direction as its predominant growth direction and displays a hexagonal cross section with (100), (101), and (10) as the bounding planes. A high density of stacking faults has been experimentally observed on the (100) plane. The present study, by using DFT based nudged elastic band (NEB) calculations, elucidates for the first time that the diffusion of B through TiB is via an interstitial-assisted mechanism as opposed to vacancy-assisted mechanism hypothesized in literature. This one dimensional interstitial-assisted diffusion results in the anisotropic growth of TiB. In addition, the energetics of TiB- α interfaces was calculated to understand the hexagonal cross-section of TiB. The intimate mixing of B27 and Bf structures and their co-existence with stacking faults has been explained by calculating the interfacial energy of B27/Bf interfaces along with stacking fault formation energy. The boride precipitates have also been shown to modify the morphology of α phase from lath like to more equiaxed like. However, the influence of TiB on the crystallography of α precipitation has not been explored in great detail. The present study will clearly demonstrate, for the first time, the influence of various alloying elements present in the titanium alloy, on the resulting effect of B addition on α morphology and its crystallography in Ti alloys. Thus, the influence of B addition on α precipitation in two classes of commercial Ti alloys, i.e. β alloys and α + β alloys have been explored. It has been found that TiB nucleated α can either become equiaxed by a loss of Burgers orientation relationship (OR) with β or can retain the lath morphology in case of alloys containing a combination of Ti, Al and Mo. digital.library.unt.edu/ark:/67531/metadc407855/
Ye Si Ye Jong: a Martial Arts Approach to Business Ethics
The purpose of this dissertation is to offer a new approach to business ethics grounded in the martial arts. This dissertation argues that traditional rules and regulations approaches to business ethics, though important, are inadequate. Such “top down” approaches must be complimented with corporate reform that comes “from the inside out.” The dissertation consults the martial arts to develop a core, multifaceted virtue – Ye Si Ye Jong – that ought to form the foundation for creating a corporate culture (or an ethos for business) that embraces a new approach to decision-making at every level of the organization – from the boards of directors, to individual employees. This dissertation frames the problem as a matter of corporate culture or ethos. This framing is a distinctive approach to corporate or business ethics in two respects: its emphasis on virtue and its integration of core concepts from the martial arts. This dissertation utilizes an uncommon example of business decision-making as its source for a case-study – a prominent university. While many may not think of colleges or universities as exemplars of common business activities, they do, in fact, provide a source of many ethical business dilemmas, both common and unique. Universities have boards of directors, consumers (students and others), and regularly evaluate many financial and cost accounting situations that are not unusual to most businesses. The Jerry Sandusky case at Penn State University provides an opportunity that is ripe for consideration of various business ethics decision-making and, as such, is analyzed later in this paper. digital.library.unt.edu/ark:/67531/metadc407848/
Performer’s Guide to the Execution and Application of Karen Tuttle’s Coordination, As Applied to Ernest Bloch’s Suite Hébraïque
Legendary violist and pedagogue Karen Tuttle developed a new approach to playing the viola known as Coordination. Coordination consists of a deep emotional connection to music, as well as highly specific motions of the body. This document details the execution of the physical motions of Coordination, through written descriptions and multimedia examples. A detailed discussion of the application of the motions is presented, using notated examples from Ernest Bloch’s Suite Hébraïque. digital.library.unt.edu/ark:/67531/metadc407842/
The Academic and Athletic Experiences of African-american Males in a Division I (Fbs) Football Program
This study investigated the academic and athletic experiences of African-American males in a Division I football bowl subdivision football program. Critical race theory, identity development model, and social learning model were the theoretical frameworks used as the critical lenses in a qualitative design to examine the participants. The participants’ responses were analyzed and interpreted using thematic analysis. A qualitative research design, which included individual interviews with 10 second year African-American male football players, was used to address this research problem. The goal was to bring together both the psychological and sociological perspectives and to challenge participants to candidly describe their academic and athletic experiences and attitudes toward obtaining an undergraduate degree. Four themes were determined in the data analysis: differential treatment and determining oneself, time management, relationships, and career aspirations. In relation to the theoretical frameworks, the development of self-confidence and knowledge of balancing their academic and athletic schedules was critical for all participants. The sense of feeling different and challenged because of the differences in culture and experience was evident. From this study, university and collegiate athletics administrators may better understand the backgrounds, challenges, and learning needs of this population. As a result, higher education personnel may improve the services they provide these young men in hopes of educating and developing whole persons—physically, emotionally, intellectually, socially, and spiritually—to become well-rounded and functional in contemporary society. digital.library.unt.edu/ark:/67531/metadc407844/
Shakespeare and Modeling Political Subjectivity
This dissertation examines the role of aesthetic activity in the pursuit of political agency in readings of several of Shakespeare’s plays, including Hamlet (1600), A Midsummer Night’s Dream (1595), The Tempest (1610), the history plays of the second tetralogy (1595-9), Julius Caesar (1599), and Coriolanus (1605). I demonstrate how Shakespeare models political subjectivity—the capacity for individuals to participate meaningfully in the political realm—as necessitating active aesthetic agency. This aesthetic agency entails the fashioning of artistically conceived public personae that potential political subjects enact in the public sphere and the critical engagement of the aesthetic and political discourses of the subjects’ culture in a self-reflective and appropriative manner. Furthermore, these subjects should be wary auditors of the texts and personae they encounter within the public sphere in order to avoid internalizing constraining ideologies that reify their identities into forms less conducive to the pursuit of liberty and social mobility. Early modern audiences could discover several models for doing so in Shakespeare’s works. For example, Hamlet posits a model of Machiavellian theatricality that masks the Prince's interiority as he resists the biopolitical force and disciplinary discourses of Claudius's Denmark. Julius Caesar and Coriolanus advance a model of citizenship through the plays’ nameless plebeians in which rhetoric offers the means to participate in Rome’s political culture, and Shakespeare’s England for audiences, while authorities manipulate citizen opinion by molding the popularity of public figures. Public, artistic ability affords potential political subjects ways of not only framing their participation in their culture but also ways of conceiving of their identities and relationships to society that may defy normative notions of membership in the community. digital.library.unt.edu/ark:/67531/metadc407853/
Multi-year Operation Effect of Geothermal Heat Exchanger on Soil Temperature for Unt Zero Energy Lab
Ground source heat pump (GSHP) uses earth’s heat to heat or cool space. Absorbing heat from earth or rejecting heat to the earth, changes soil’s constant temperature over the multiple years. In this report we have studied about Soil temperature change over multiple years due to Ground loop heat exchanger (GLHE) for Zero Energy Research Laboratory (ZØE) which is located in Discovery Park, University of North Texas, Denton, TX. We did 2D thermal analysis GLHP at particular Depth. For simulation we have used ANSYS workbench for pre-processing and FLUENT ANYS as solver. TAC Vista is software that monitors and controls various systems in ZØE. It also monitors temperature of water inlet/outlet of GLHE. For Monitoring Ground temperatures at various depths we have thermocouples installed till 8ft from earth surface, these temperatures are measured using LabVIEW. From TAC Vista and LabVIEW Reading’s we have studied five parameters in this report using FLUENT ANSYS, they are; (1) Effect of Time on soil Temperature change over Multi-years, (2) Effect of Load on soil temperature change over Multi-years, (3) Effect of Depth on soil temperature change over Multi-years, (4) Effect of Doubling ΔT of inlet and outlet of GLHE on soil temperature change over multi-years and (5) Effect on soil temperature change for same ZØE Laboratory, if it’s in Miami, Florida. For studying effect of time on soil temperature change for multi-years, we have varied heating and cooling seasons. We have four cases they are Case A: GSHP always “ON” (1) 7 months cooling and 5 month cooling and (2) 257 days are cooling and 108 days heating. Case B: GSHP “OFF” for 2 months (1) 7 months cooling and 3 months heating and (2) 6 months cooling and 4 month heating. For Studying Effect of Load on soil temperature change over multi-years, we have considered maximum temperature difference between inlet and outlet for heating and cooling season for simulation. For studying effect of doubling ΔT of inlet and outlet of GLHE, we have doubled the temperature difference between inlet and outlet of GLHP. There will be soil temperature change over year at various depths. For studying Effect of Depth on soil temperature change for multi-years, we have consider 5 depths, they are 4ft, 6ft, 8ft, 110ft and 220ft. The Densities of soil are known from site survey report of ZØE GSHP manufacturers till depth of 13ft. For studying effect of soil temperature over multi-years for same ZØE in Miami, Florida, we have considered equivalent cooling and heating season from weather data for past one year and assuming same number of days of cooling and heating for next 20 years we have simulated for soil temperature change. digital.library.unt.edu/ark:/67531/metadc407847/
Characterization of Viscoelastic Properties of a Material Used for an Additive Manufacturing Method
Recent development of additive manufacturing technologies has led to lack of information on the base materials being used. A need arises to know the mechanical behaviors of these base materials so that it can be linked with macroscopic mechanical behaviors of 3D network structures manufactured from the 3D printer. The main objectives of my research are to characterize properties of a material for an additive manufacturing method (commonly referred to as 3D printing). Also, to model viscoelastic properties of Procast material that is obtained from 3D printer. For this purpose, a 3D CAD model is made using ProE and 3D printed using Projet HD3500. Series of uniaxial tensile tests, creep tests, and dynamic mechanical analysis are carried out to obtained viscoelastic behavior of Procast. Test data is fitted using various linear and nonlinear viscoelastic models. Validation of model is also carried out using tensile test data and frequency sweep data. Various other mechanical characterization have also been carried out in order to find density, melting temperature, glass transition temperature, and strain rate dependent elastic modulus of Procast material. It can be concluded that melting temperature of Procast material is around 337°C, the elastic modulus is around 0.7-0.8 GPa, and yield stress is around 16-19 MPa. digital.library.unt.edu/ark:/67531/metadc407787/
Immunohistochemistry of the Gills of the Channel Catfish Ictalurus Punctatus: Cells and Neurochemicals That May Be Involved in the Control of Cardioventilatory Reflexes
Access: Use of this item is restricted to the UNT Community.
In teleost fishes the neurochemicals involved in sensing and responding to hypoxia are unresolved. Serotonergic branchial neuroepithelial cells (NECs) are putative O2 chemoreceptors believed to be homologous to the neural crest (NC) derived APUD (amine-precursor uptake and decarboxylation) pulmonary NECs and carotid body type-1 glomus cells. Branchial NECs contain serotonin (5-HT), thought to be central to the induction of the hypoxic cardioventilatory reflexes. However, application of 5-HT in vivo does not elicit cardioventilatory reflexes similar to those elicited by hypoxia. But previous in vitro neural recordings from glossopharyngeal (IX) afferents innervating O2 chemoreceptors in the trout gill show the same discharge response to hypoxic conditions as does that of acetylcholine (ACh) application. This evidence strongly supports the cholinergic hypothesis of chemoreceptor impulse origin rather than a serotonergic-induced impulse origin model. We therefore hypothesized that NECs contain ACh among other neurochemicals in cells belonging to the APUD series. Although serotonergic branchial NECs did not colocalize with ACh using immunohistochemical methods, several populations of ACh and/or tyrosine hydroxylase (TH) (catecholaminergic) positive, dopamine (DA) negative, cells were found throughout the second gill arch of the channel catfish Ictalurus punctatus. In addition, the NC derivation marker zn-12 labelled the HNK-1-like epitope (Human natural killer) expressed by lamellar pillar cells’ collagen column-associated pillar cell adhesion molecules (CC-PCAMs), evidence confirming their hypothesized NC origin. digital.library.unt.edu/ark:/67531/metadc407757/
The Measurement of the Third-order Elastic Constants for La3ga5sio14 (Lgs) and La3ga55ta05o14 (Lgt) Single Crystal
Recently, the development of electronic technology towards higher frequencies and larger band widths has led to interest in finding new piezoelectric materials, which could be used to make filters with larger pass band widths and oscillators with better frequency stability. Langasite (La3Ga5SiO14, LGS) and its isomorphs have enticed considerable attention of researchers as a potential substrate material for piezoelectric device applications because of its high frequency stability and fairly good electromechanical coupling factors for acoustic wave devices. Nonlinear effect including drive level dependence, mode coupling, force-frequency effect and electroelasic effect are critical for the design of these devices. Third-order elastic constants (TOEC) play an important role in a quantitative analysis of these nonlinear effects. In particular these elastic constants are of great importance when the BAW (Bulk Acoustic Wave) and SAW (Surface Acoustic Wave) sensors of force, acceleration and so on are designed. Until now Langasite (LGS) and Langatate (LGT) crystal resonators have been qualified in terms of quality factor, temperature effect, isochronism defect and material quality. One of the most important advantages of those crystals is that they will not undergo phase transitions up to its melting temperature of 1450°. Presently there is no data on TOEC of LGT crystals. Our objective is to create an experimental procedure to measure and collect the complete set of third-order elastic constants of Langasite (La3Ga5SiO14) and Langatate (La3Ga5.5Ta0.5O14) crystals and compare the new values for langasite with values previously reported. digital.library.unt.edu/ark:/67531/metadc407770/
Tribological Behavior of Spark Plasma Sintered Tic/graphite/nickel Composites and Cobalt Alloys
Access: Use of this item is restricted to the UNT Community.
Monolithic composites are needed that combine low friction and wear, high mechanical hardness, and high fracture toughness. Thin films and coatings are often unable to meet this engineering challenge as they can delaminate and fracture during operation ceasing to provide beneficial properties during service life. Two material systems were synthesized by spark plasma sintering (SPS) and were studied for their ability to meet these criteria. A dual hybrid composite was fabricated and consisted of a nickel matrix for fracture toughness, TiC for hardness and graphite for solid/self‐lubrication. An in‐situ reaction during processing resulted in the formation of TiC from elemental Ti and C powders. The composition was varied to determine its effects on tribological behavior. Stellite 21, a cobalt‐chrome‐molybdenum alloy, was also produced by SPS. Stellite 21 has low stacking fault energy and a hexagonal phase which forms during sliding that both contribute to low interfacial shear and friction. Samples were investigated by x‐ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x‐ray spectroscopy (EDS), and electron back‐scattered diffraction (EBSD). Tribological properties were characterized by pin on disc tribometry and wear rates were determined by profilometry and abrasion testing. Solid/self‐lubrication in the TiC/C/Ni system was investigated by Raman and Auger mapping. A tribofilm, which undergoes a stress‐induced phase transformation from polycrystalline graphite to amorphous carbon, was formed during sliding in the TiC/C/Ni system that is responsible for low friction and wear. TiC additions help to further decrease wear. Stellite 21 was also found to exhibit acceptably low friction and wear properties arising from the presence of Cr23C6 in the matrix and work hardening of the cobalt and chromium during sliding. digital.library.unt.edu/ark:/67531/metadc407776/
A Comprehensive Modeling Framework for Airborne Mobility
Access: Use of this item is restricted to the UNT Community.
Mobility models serve as the foundation for evaluating and designing airborne networks. Due to the significant impact of mobility models on the network performance, mobility models for airborne networks (ANs) must realistically capture the attributes of ANs. In this paper, I develop a comprehensive modeling framework for ANs. The work I have done is concluded as the following three parts. First, I perform a comprehensive and comparative analysis of AN mobility models and evaluate the models based on several metrics: 1) networking performance, 2) ability to capture the mobility attributes of ANs, 3) randomness levels and 4) associated applications. Second, I develop two 3D mobility models and realistic boundary models. The mobility models follow physical laws behind aircraft maneuvering and therefore capture the characteristics of aircraft trajectories. Third, I suggest an estimation procedure to extract parameters in one of the models that I developed from real flight test data. The good match between the estimated trajectories and real flight trajectories also validate the suitability of the model. The mobility models and the estimation procedure lead to the creation of “realistic” simulation and evaluation environment for airborne networks. digital.library.unt.edu/ark:/67531/metadc407760/
A Textual Analysis of the Closer and Saving Grace: Feminist and Genre Theory in 21St Century Television
Television is a universally popular medium that offers a myriad of choices to viewers around the world. American programs both reflect and influence the culture of the times. Two dramatic series, The Closer and Saving Grace, were presented on the same cable network and shared genre and design. Both featured female police detectives and demonstrated an acute awareness of postmodern feminism. The Closer was very successful, yet Saving Grace, was cancelled midway through the third season. A close study of plot lines and character development in the shows will elucidate their fundamental differences that serve to explain their widely disparate reception by the viewing public. digital.library.unt.edu/ark:/67531/metadc407774/
Shortened in Vivo Bioconcentration Factor Testing in Cyprinus Carpio
Bioconcentration factor testing serves as the most valuable surrogate for the assessment of bioaccumulation. The assessment of potentially harmful chemicals is crucial to not only the health of aquatic environments, but to humans as well. Chemicals that possess the ability to persist in the environment or that have the potential to bioaccumulate, pose a greater risk to organisms that are exposed to these chemicals. The Organization for Economic Cooperation and Development Guideline 305 outlines specific protocols to run an accurate and reliable aquatic flow-through test. However, since its adoption in 1996, very few changes have been made to accommodate the endeavor to lowering the amount of test species to run one of these said tests. Running an aquatic flow-through test, according to 305, takes much time and money as well as numerous amounts of fish. Such burdens can be eliminated through simple modifications to the standard protocols. In this study, we propose an abbreviated study design for aquatic bioconcentration testing which effectively alleviates the burdens of running a flow-through test. Four chemicals were used individually to evaluate the usefulness of the proposed shortened design; 4-Nonyphenol, Chlorpyrifos, Musk Xylene, and DDT. The study consisted of exposing Cyprinus carpio for 7 days followed by 7 days of depuration, for a total of a 14-day study. Our results for each of the four compounds are consistent with literature values, thus, demonstrating that BCFk can be accurately predicted in an abbreviated in vivo test. digital.library.unt.edu/ark:/67531/metadc407781/
The Acute Hormonal Response to the Kettlebell Swing Exercise
The purpose of this investigation was to examine the acute hormonal response to a bout of kettlebell swing exercise. Ten healthy men (19-30 y, 23.6 ± 3.5 y, 174.6 ± 5.7 cm, 78.7 ± 9.9 kg) who were engaged in resistance training at least twice per week but were inexperienced with kettlebell swings participated in this study. Participants were familiarized with the kettlebell swing exercise during an initial visit. During the subsequent experimental protocol visit, participants performed 12 rounds of 30 seconds of 16-kg kettlebell swings alternated with 30 seconds of rest. Heart rate (HR) and rating of perceived exertion (RPE) were measured at the end of every round of swings. Fasted blood samples were collected pre-exercise (PRE), immediately post (IP), 15 minutes post (P15), and 30 minutes post exercise (P30) and analyzed for total testosterone (T), growth hormone (GH), cortisol, and lactate concentrations. Participants completed a total of 227 ± 23 swings (average swings per round: 19 ± 2). HR and RPE increased significantly (P < 0.05) throughout the exercise protocol. Lactate concentrations were significantly increased at all post exercise time points compared to PRE. T was significantly increased at IP compared to PRE. GH was significantly increased at IP, P15, and P30 compared to PRE. Cortisol was significantly increased at IP and P15 compared to PRE. 12 rounds of 30 seconds of kettlebell swing exercise induced an acute increase in T, GH, and cortisol concentrations in resistance trained men. Additionally, this exercise protocol induced a large increase in HR and lactate concentration. Thus, the kettlebell swing exercise might provide an effective method for simultaneous endurance and resistance training. digital.library.unt.edu/ark:/67531/metadc407736/
Ten Years After 9/11: the Structure and Use of Intelligence Units in Local Policing
The events of September 11, 2001 marked a paradigm shift in the strategy within all levels of law enforcement in the United States. Intelligence became the watchword of the day and with it, the movement to incorporate strategic and tactical information in daily policing. Yet while the philosophy was clear, the method and manner to which agencies were left to achieve these goals was much less designed. The federal government allocated funds to assist help agencies incorporate an intelligence function in their daily operations but which agencies and to what degree remains unclear even today. This study seeks to determine the current state of use of intelligence in municipal law enforcement agencies in the State of Texas ten years after 9/11. Through use of a survey, it assesses the frequency of use of intelligence units in local police departments in the State of Texas, identifies commonalities in their structure, and determines the state of their effectiveness. digital.library.unt.edu/ark:/67531/metadc407786/
The Effect of It Process Support, Process Visualization and Process Characteristics on Process Outcomes
Business process re-engineering (part of the Business Process Management domain) is among the top three concerns of Information Technology (IT) leaders and is deemed to be one of many important IT leveraging opportunities. Two major challenges have been identified in relation to BPM and the use of IT. The first challenge is related to involving business process participants in process improvement initiatives using BPM systems. BPM technologies are considered to be primarily targeted for developers and not BPM users, and the need to engage process participants into process improvement initiatives is not addressed, contributing to the business-IT gap. The second challenge is related to potential de-skilling of knowledge workers when knowledge-intensive processes are automated and process knowledge resides in IT, rather than human process participants. The two identified challenges are not separate issues. Process participants need to be knowledgeable about the process in order to actively contribute to BPM initiatives, and the loss of process knowledge as a result of passive use of automated systems may further threaten their participation in process improvement. In response to the call for more research on the individual impacts of business process initiatives, the purpose of this dissertation study is to understand the relationship between IT configurations (particularly process support and process visualization), process characteristics and individual level process outcomes, such as task performance and process knowledge. In the development of the research model we rely on organizational knowledge creation literature and scaffolding in Vygotsky’s Zone of Proximal Development, business process modeling and workflow automation research, as well as research on the influence of IT on individual performance. The theoretical model is tested empirically in experimental settings using a series of two studies. In both studies participants were asked to complete tasks as part of a business process using different versions of a mock-up information system. Together, the studies evaluate the effect of IT process support, process visualization and process complexity on process participant performance and process knowledge. The results of the studies show the significant influence of IT process support on individual process outcomes. The studies indicate that task performance does increase but at the cost of users’ process knowledge. Process visualization however is shown to enhance user’s process knowledge in the event of no formal process training while having no negative impact on task performance. The key contribution of this research is that it suggests a practical way to counteract potential negative effects of IT process automation by converting the use of the information system into a learning experience, where the IT itself acts as a scaffold for the acquisition of process knowledge. The results have practical implications for the design of workflow automation systems, as well as for process training. digital.library.unt.edu/ark:/67531/metadc407777/
Evaluating the Cultural Plan of Austin, Texas
This is a concurrent, mixed methods study of the impacts of Austin, Texas’s cultural plan, CreateAustin. In the study, trend analysis and a t-test were used to examine variables before and after the cultural plan was in place. At the same time, interviews with cultural planners were used to uncover other effects. My research addresses a gap in the literature between understanding the desired and actual outcomes of a cultural plan. Cultural plans are being developed by many communities in an effort to attract creative workers but they are rarely evaluated. Evaluation using a mixed methods approach is necessary to capture all the outcomes of a cultural plan, rather than the limited scope of impacts that are captured by qualitative or quantitative analyses alone. My analysis of the quantitative variables showed some significant differences between when the plan was in place and the years prior to its creation. Interviews with key stakeholders revealed the formation of new networks as a powerful outcome of the planning process. The results allowed me to gauge the overall impact of CreateAustin and make some observations about the cultural planning process in general, as well as uncover new directions for future research. digital.library.unt.edu/ark:/67531/metadc407737/
Web Information Behaviors of Users Interacting with a Metadata Navigator
The web information behaviors of users as they interacted with a metadata navigator, the Personal Information (PI) Agent, and reflected upon their interaction experiences were studied. The process included studying the complete iterative (repeated) cycle of information needs, information seeking, and information use of users interacting with an internet-based prototype metadata PI Agent tool. Detlor’s theory of web information behaviors of organizational users was utilized as a theoretical foundation for studying human-information interactions via the PI Agent tool. The qualitative research design allowed for the use of triangulation within the context of a one-group pretest-posttest design. Triangulation occurred in three phases: (a) observe, (b) collect, and (c) reflect. Observations were made as participants solved three problem situations. Participants’ computer log and print screen data were collected, and follow-up interviews were conducted once all posttest sessions ended to enable users to reflect on their experiences. The three triangulation phases ensured saturation of data and greater depth regarding the participants’ information behaviors. Content analysis occurred via exploratory pattern analysis using the posttest Problem Steps Recorder (PSR) log data and on the six interviewees’ follow-up interview data. Users engaged in iterative cycles of information needs, information seeking, and information use to resolve the presented problem situations. The participants utilized the PI Agent tool iteratively to eliminate their knowledge gaps regarding the presented problem situations. This study was the first to use PSR log data for capturing evidence of the iterative search process as defined by Detlor. The implications for best practices were inspired by participant feedback, and recommendations for further study are made. digital.library.unt.edu/ark:/67531/metadc407784/
Facebook Brand Page: an Exploratory Study of Facebook Brand Page Attributes and Their Influence on Purchase Intentions
This study explored attributes of a Facebook brand page (FBP). Seven variables were derived from the framework and applied to FBPs. The goals of this research were to discover which attributes contribute to a successful FBP, determine which attributes increase purchase intentions, and help marketers determine where to focus their efforts. A total of 421 surveys were gathered from men and women ages 18 and older. The methods of this research included factor analysis and multiple regression analysis. Results yielded two loading factors for the trustworthiness variable and supported hypotheses of trustworthiness increasing purchase intentions. It was also discovered that participation positively influences purchase intentions. It is advised that information content be monitored to avoid information overload. digital.library.unt.edu/ark:/67531/metadc407753/
Rickshaw Man
This documentary film tells the story of Mohammad in India, and Mike in the United States, who are separated by social, economic, cultural, linguistic and religious differences, and yet there is an inanimate object that connects them-the rickshaw. The film examines how rickshaw men are viewed and treated by the society they live in and also illuminates the threads of commonality between these two men to show that they are not so different from each other after all. digital.library.unt.edu/ark:/67531/metadc407779/
Social Innovation in Venture Capital Firms: Strategy, Structure, and Performance
Social innovations are solutions related to humanistic needs and the betterment of mankind with the intent of creating social value and eventual societal level changes. Social innovation therefore broadens traditional views of innovation to include processes of societal transformations and human behaviors. These social innovations are becoming more commonplace across all sectors, including capital markets. Private equity and venture capital firms in the capital markets sector engage in social innovation by investing capital with the goal of delivering both economic and social value. Despite the critical importance of venture capital (VC) in the success of social innovations through socially responsible investing, there is a paucity of research in understanding the factors that affect the performance of these social VC firms. This research gap is addressed by asking the following primary research question: What is the role of strategic and structural factors in the performance of socially innovative venture capital firms? The firm level research is theoretically based on the well-established design school. This framework highlights the overarching importance of strategy and structure in the accomplishment of firm goals. In the context of the venture capital industry, it was hypothesized that certain unique strategic and structural factors (i.e., stage of investment, age, size, and network relationships) would influence the performance of socially innovative VC firms. A moderated mediation model was proposed to examine these factors and their influence on performance variation. The sample of socially innovative VC firms was generated from the ThomsonOne Private Equity Database. The research design and methodology followed a systematic and objective process. This included identification of the sample of 381 VC firms, collection of mission statements for each VC firm, development of key word list pertaining to social innovation for content analysis and the collection of archival data on each VC firm. Content analysis was then used to identify the degree to which the firm’s strategic orientation (mission statement) was related to social innovation. Finally, both traditional and more cutting edge statistical analyses (Preacher & Hayes, 2008) were used to evaluate the moderated mediation model. The results of this study provide several key take-a-ways for both researchers and practitioners focusing on social venture capital. Firstly, results indicated that firms adopt distinct foci of social investing that directs their strategic orientation. These various foci have vastly differing effects on the firm’s overall performance, the strategic decisions they make, and the architecture of their structural design. It is therefore necessary to treat each focus area separately given differences in strategies, industry and investment focus, and market orientations. Secondly, including socially related language in the firm’s mission statement does not guarantee that a VC firm will actually implement a social orientation or seek to create the social value inherent in social innovation. Thirdly, certain investment strategies appear to be more advantageous depending of the size of the firm and the socialness of the firm’s orientation. Lastly, results supported that the adoption of a social orientation did not negatively influence firm performance. Overall, results suggest that pursuing a social orientation is viable and effective in delivering blended value strategies for VC firms engaging in social innovation. These findings offers socially oriented venture capital firms insights into strategic and structural aspects that are important to their success in achieving positive exists of their portfolio companies, thus increasing both financial and social value. digital.library.unt.edu/ark:/67531/metadc407767/
Assessing Local Governments’ Debt Financing Strategies
This dissertation assesses the importance of a specific debt instrument, the Certifi- cate of Obligation in the state of Texas. It conceptualizes the Certificate of Obligation as a type of contractual debt that enables local governments to finance their capital projects. This dissertation is guided by three research questions: (1) What are the various types of debt instruments employed by local governments and what are their relative advantages? (2) How prevalent is the use of a specific debt instrument such as Certificates of Obligation? And why would some local governments prefer to issue them while others do not? (3) To what extent does the local institutional environment, e.g., the executive authority of city managers in the council-manager form of government, affect debt financing behaviors of local governments? To examine the first research question, we created a typology to represent four ideal types of borrowing methods: (1) Contractual Debt, (2) Voter Approval/Special Tax Debt, (3) Guaranteed, and (4) Non-Guaranteed Debts. The typology examines whether or not the state mandates the referendum requirement for the use of each of these debt instruments, and at the same time determines whether each debt instrument is secured by multiple or single revenue sources. Using data we collected among municipal governments in Texas, we conducted two empirical analyses. The first analysis tests the hypothesis that Certificates of Obligation have higher borrowing costs compared to GO bonds, since a GO bond is often issued under the pledge of the bond issuers’ full-faith credit and taxing authority. We employed a two-stage least square analysis to test the general proposition in the state of Texas. Based on 741 Certificates of Obligation and GO bonds issued between 2008 and 2011, our analyses show that Certificates of Obligation are likely to incur True Interest Costs (TIC) similar to those of GO bonds. The second analysis explores factors explaining the use of Certificates of Obligation in 225 Texas charter cities. Based on Heckman’s two-stage, we found that a local government’s decision to issue Certificates of Obligation to be partly explained by the characteristics of local population, i.e., median household income, population growth, and the percentage of senior citizens living in the jurisdiction. In the case of GO bonds, we found that population size, property tax rate, debt burden, and the percentage of population with at least a college education, to be an important determinant of GO bonds. The volume of GO issuance by local governments was also related to the level of regional competition, i.e., government density. Additionally, we found that local political institutions matter and that they affect debt financing behaviors of local governments. digital.library.unt.edu/ark:/67531/metadc407780/
Churches, Social Service Access and Korean-american Elders: an Exploratory Study
This study examined how Korean co-ethnic churches serve as connections between Korean seniors and the agencies that offer social and health care services. The study developed from a pilot outreach program funded by the North Central Texas Council of Governments’ Area Agency on Aging (NCTAAA) to inform Korean seniors about Medicare-related programs between February and May of 2011. The results of the pilot program suggested that the Korean-American church can be an effective place for program outreach. The dissertation project, working in partnership with the NCTAAA and 2-1-1 services, further explored the use of Korean churches as a vehicle to connect Korean seniors to Extra Help (EH) and Medicare Saving Programs (MSP) and 2-1-1 services, a toll-free number for information about non-emergency health and social services. Fifty-three pastors were contacted to participate in a telephone survey and a face-to-face, in-depth semi-structured interview. Thirty telephone surveys and 11 face-to-face interviews were conducted. Five of the 30 pastors agreed to host program outreach presentations for the EH, MSP, and 2-1-1 services in their churches. Host churches tended to be more likely highly structured, regularly scheduled programs (e.g., Senior College) for seniors already in place. A total of 405 Korean seniors participated in the program outreach sessions. Five seniors received the EH application information, and 17 MSP application forms were distributed. Additionally, 28 seniors were assisted by phone, not only with the targeted programs, but also with other benefits information. Together, these outcomes indicate that the co-ethnic church can be a vehicle to connect Korean seniors to services offered by outside agencies. digital.library.unt.edu/ark:/67531/metadc407746/
Integrated Computational and Experimental Approach to Control Physical Texture During Laser Machining of Structural Ceramics
The high energy lasers are emerging as an innovative material processing tool to effectively fabricate complex shapes on the hard and brittle structural ceramics, which previously had been near impossible to be machined effectively using various conventional machining techniques. In addition, the in-situ measurement of the thermo-physical properties in the severe laser machining conditions (high temperature, short time duration, and small interaction volume) is an extremely difficult task. As a consequence, it is extremely challenging to investigate the evolution of surface topography through experimental analyses. To address this issue, an integrated experimental and computational (multistep and multiphysics based finite-element modeling) approach was employed to understand the influence of laser processing parameters to effectively control the various thermo-physical effects (recoil pressure, Marangoni convection, and surface tension) during transient physical processes (melting, vaporization) for controlled surface topography (surface finish). The results indicated that the material lost due to evaporation causes an increase in crater depth of machined cavity, whereas liquid expulsion created by the recoil pressure increases the material pileup height around the lip of machined cavity, the major attributes of surface topography (roughness). Also, it was found that the surface roughness increased with increase in laser energy density and pulse rate (from 10 to 50Hz), and with the decrease in distance between two pulses (from 0.6 to 0.1mm) or the increase in lateral and transverse overlap (0, 17, 33, 50, 67, and 83%). The results of the computational model are also validated by experimental observations with reasonably close agreement. digital.library.unt.edu/ark:/67531/metadc407758/
Social Support As a Moderating Factor Between Mental Health Disruption and College Adjustment in Student Veterans
Research has indicated that OEF/OIF veterans are experiencing mental health concerns following deployment. While there are increasing numbers of veterans returning to higher education institutions after discharging from the military, there is a scarcity of empirical research investigating student veterans’ experiences as they transition into college. The purpose of the current study was to examine whether social support moderates the effects of psychological distress on college adjustment among a sample of student veterans. Participants were administered a Background Information Questionnaire, measures of psychological distress (i.e., GAD-7, PHQ-9, IES-R), Multidimensional Scales of Perceived Social Support, and the Student Adjustment to College Questionnaire. Multiple regressions revealed significant main effects for the variables of interest, but analyses failed to support the hypothesis that perceived social support would moderate the effects of psychological distress on college adjustment. digital.library.unt.edu/ark:/67531/metadc407769/
An Examination of Mathematics Teachers’ Use of Student Data in Relationship to Student Academic Performance
Among educational researchers, important questions are being asked about how to improve mathematics instruction for elementary students. This study, conducted in a north Texas public school with 294 third- through fifth-grade students, ten teachers and three coaches, examined the relationship between students’ achievement in mathematics and the mathematics teaching and coaching instruction they received. Student achievement was measured by the Computer Adaptive Instrument (CAT), which is administered three times a year in the district and is the main criterion for students’ performance/movement in the district’s response to intervention program for mathematics. The response to intervention model employs student data to guide instruction and learning in the classroom and in supplemental sessions. The theoretical framework of the concerns based adoption model (CBAM) was the basis to investigate the concerns that mathematics teachers and coaches had in using the CAT student data to inform their instruction. The CAT data, based on item response theory, was the innovation. Unique in this study was the paralleling of teachers’ and coaches’ concerns and profiles for their use of the data with student scores using an empirical approach. Data were collected at three intervals through the Stages of Concerns Questionnaire, the Levels of Use interviews, and the Innovation Configuration Components Matrix from teachers and at three intervals student CAT-scaled scores. Multiple regression analyses with the concerns and CAT scores and levels of use and CAT scores were conducted to determine if relationships existed between the variables. The findings indicated that, overall, the teachers and coaches who scored high in personal concerns at the three data points remained at low levels of use or non-use of CAT data in their instruction. Only two teachers indicated movement from high intense personal concerns to high concerns regarding the impact on students. This correlated with their increased use of CAT at the three-collection points. The regression analyses indicated no correlations between the teachers’ and coaches’ concerns and the CAT and no correlations between their levels of data use and the CAT. At the exit interviews, patterns suggested that the presence of a change facilitator might have made a difference in their understanding and use of the CAT data ultimately impacting student achievement. This study sets a new precedent in the use of CBAM data and offers insights into the necessity of providing support and training in a change process. digital.library.unt.edu/ark:/67531/metadc407744/
The Effect of Menthol on Nicotine Metabolism: a Cross Species Evaluation
The effect of menthol on nicotine metabolism was examined in liver S9 fractions of four different species and in the in vivo mouse model. The purpose of this study was to investigate three parameters: (1) biotransformation of nicotine to cotinine in various species (human, mouse, rat and trout) using in vitro methods; (2) to determine if the addition of menthol with nicotine altered biotransformation of nicotine to cotinine; (3) and to assess similar parameters in an in vivo mouse model. The major findings of this study include: (1) mice appear to metabolize nicotine, over time, in a manner similar to humans; (2) menthol decreased cotinine production, over time, after a single dose in mice; and (3) menthol increased cotinine production, over time, after repeated doses, in mice. digital.library.unt.edu/ark:/67531/metadc407773/
Laser Surface Modification on Az31b Mg Alloy for Bio-wettability
Laser surface modification of AZ31B Magnesium alloy changes surface composition and roughness to provide improved surface bio-wettability. Laser processing resulted in phase transformation and grain refinement due to rapid quenching effect. Furthermore, instantaneous heating and vaporization resulted in removal of material, leading the textured surface generation. A study was conducted on a continuum-wave diode-pumped ytterbium laser to create multiple tracks for determining the resulting bio-wettability. Five different laser input powers were processed on Mg alloy, and then examined by XRD, SEM, optical profilometer, and contact angle measurement. A finite element based heat transfer model was developed using COMSOL multi-physics package to predict the temperature evolution during laser processing. The thermal histories predicted by the model are used to evaluate the cooling rates and solidification rate and the associated changes in the microstructure. The surface energy of laser surface modification samples can be calculated by measuring the contact angle with 3 different standard liquid (D.I water, Formamide, and 1-Bromonaphthalen). The bio-wettability of the laser surface modification samples can be conducted by simulated body fluid contact angle measurement. The results of SEM, 3D morphology, XRD, and contact angle measurement show that the grain size and roughness play role for wetting behavior of laser processing Mg samples. Surface with low roughness and large grain size performs as hydrophilicity. On the contrast, surface with high roughness and small grain size performs as hydrophobicity. digital.library.unt.edu/ark:/67531/metadc407788/
Boosting for Learning From Imbalanced, Multiclass Data Sets
Access: Use of this item is restricted to the UNT Community.
In many real-world applications, it is common to have uneven number of examples among multiple classes. The data imbalance, however, usually complicates the learning process, especially for the minority classes, and results in deteriorated performance. Boosting methods were proposed to handle the imbalance problem. These methods need elongated training time and require diversity among the classifiers of the ensemble to achieve improved performance. Additionally, extending the boosting method to handle multi-class data sets is not straightforward. Examples of applications that suffer from imbalanced multi-class data can be found in face recognition, where tens of classes exist, and in capsule endoscopy, which suffers massive imbalance between the classes. This dissertation introduces RegBoost, a new boosting framework to address the imbalanced, multi-class problems. This method applies a weighted stratified sampling technique and incorporates a regularization term that accommodates multi-class data sets and automatically determines the error bound of each base classifier. The regularization parameter penalizes the classifier when it misclassifies instances that were correctly classified in the previous iteration. The parameter additionally reduces the bias towards majority classes. Experiments are conducted using 12 diverse data sets with moderate to high imbalance ratios. The results demonstrate superior performance of the proposed method compared to several state-of-the-art algorithms for imbalanced, multi-class classification problems. More importantly, the sensitivity improvement of the minority classes using RegBoost is accompanied with the improvement of the overall accuracy for all classes. With unpredictability regularization, a diverse group of classifiers are created and the maximum accuracy improvement reaches above 24%. Using stratified undersampling, RegBoost exhibits the best efficiency. The reduction in computational cost is significant reaching above 50%. As the volume of training data increase, the gain of efficiency with the proposed method becomes more significant. digital.library.unt.edu/ark:/67531/metadc407775/
Relationships of Benthic Macroinvertebrate Community Structure with Land-use, Habitat, In-stream Water Chemistry, Depositional Sediment Biofilm Fatty Acids, and Surfactants in the Effluent Dominated Texas Trinity River
The Trinity River is an urbanized, effluent-dominated river, and is heavily relied upon for drinking water. The benthic macroinvertebrate community has been monitored for over 20 years, with the focus of this dissertation on three studies (1987-88, 2005, and 2011). Water quality improvement following dechlorination resulted in increased benthic metrics. Overall habitat quality, in-stream cover, surface water total organic carbon, sediment total organic carbon, near-field urban land-use, near-field forested land-use, surface water surfactant toxic units, and depositional sediment biofilm fatty acids all have statistically significant relationships with benthic macroinvertebrate metrics. These relationships are better defined with increased taxonomic resolution at the genus/species level for all benthic taxa, including Chironomidae and Oligochaeta. It is recommend that benthic identifications for state and city water quality assessments be done at the genus/species level. A novel method for quantifying depositional sediment biofilm fatty acids has been produced and tested in this dissertation. Benthic metrics are directly related to fatty acid profiles, with several essential fatty acids found only at upstream sites. digital.library.unt.edu/ark:/67531/metadc407738/
Using a Multimodal Sensing Approach to Characterize Human Thermal Comfort Level
A method to distinguish human level of comfort has been developed by using a thermal camera, physiological sensors, and a surroundings sensor. The method has successfully collected data from hominal facial features, breathing rate, skin temperature, room temperature, blood volume pressure, relative humidity, and air velocity. Participants from all genders and races were involved in two sessions of a human comfort experiment including a psychology survey session. The variables, such as room temperature and clothing are controlled to maintain steady test conditions. The region of interest was determined by body temperature and facial temperature as registered by the thermal imaging camera. To experience different levels of discomfort, participants were required to perform two different activities. The first session included an activity on the air resistance elliptical and the second session required the subjects to remain steady in front of a fan. The data was subsequently compared on all subjects to determine whether human discomfort and comfort can be predicted by using various approaches. The parameters of discomfort and comfort were simulated to characterize human levels of comfort. According to arrangement of correlation among thermal comfort responses, blood volume pressure, skin temperature, respiration, and skin conduction, we are be able to predict discomfort and comfort affective states. digital.library.unt.edu/ark:/67531/metadc407778/
Adolescent Behavior Problems and Interparental Conflict: the Moderating Role of Parent-child Attachment
The current study examined the role that parent-child attachment plays in the relationship between marital conflict and the development of behavior problems in adolescents. To evaluate the hypothesis that attachment moderates this relationship, 57 families were recruited via e-mail invitation sent to families that participated in local church youth groups, school organizations, and a treatment program designed for adolescents with behavior problems. One custodial parent and his/her adolescent child completed an online or paper version of a survey consisting of the Achenbach’s Behavior Checklists, the Inventory of Parent and Peer Attachment, and the Children’s Perception of Interparental Conflict Scale. Hypotheses were evaluated using Baron and Kenny’s (1986) procedures to test moderating effects with multiple regression analyses. Mother attachment demonstrated a significant moderation effect between the intensity of interparental conflict and the parent’s report of externalizing behavior problems. Specifically, at low conflict intensity levels, relative to low attachment security, high attachment security was associated with fewer externalizing behavior problems, whereas at high intensities of interparental conflict high attachment security was associated with more externalizing behavior problems. digital.library.unt.edu/ark:/67531/metadc407793/
Examining High School Coaches’ Likelihood to Refer To, Interest in Working With, and Plans to Hire a Sport Psychologist
The primary goal of the current study was to extend previous research suggesting that coaches are the primary gatekeepers who may be a barrier to working with athletes by examining high school coaches likelihood to refer to, interest in, and intention to hire a sport psychologist. Specifically, the current study examined relationships between high school coaches’ sex, age, and type of sport coached (i.e., contact vs. non-contact) and their likelihood to refer athletes to a sport psychologist for a variety of presenting issues (i.e., poor attentional focus, poor leadership, family issues, etc.). It also examined relationships between coaches’ sex, age, and type of sport coached (i.e., contact vs. non-contact) and their interest in working with a sport psychologist. Finally, the study examined reasons why coaches did not plan to hire a sport psychologist. An examination of the possible reasons that high school coaches do not plan to hire a sport psychologist served an exploratory purpose. Participants included 450 coaches who coached high school sports in the United States. Results indicated that female coaches and non-contact sport coaches were more likely to refer athletes to a sport psychologist for a variety of referral issues than male coaches and coaches of contact sports. Similarly, significantly more female coaches and non-contact sport coaches showed interest in working with a sport psychologist than male coaches and coaches of contact sports. Coaches who did not plan to hire a sport psychologist reported that cost, lack authority to hire, and lack of availability as primary reasons. Implications of the findings, limitations, and future directions are discussed. digital.library.unt.edu/ark:/67531/metadc407762/
FIRST PREV 1 2 3 4 5 NEXT LAST