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Faculty Members' Readiness for E-learning in the College of Basic Education in Kuwait (open access)

Faculty Members' Readiness for E-learning in the College of Basic Education in Kuwait

E-learning exposes students and instructors to different learning models such as constructivism rather than the traditional learning. E-learning as a part of today's technology has proven that it is appropriate for most students' mentalities and is a mind tool which promotes different learning models, such as problem solving strategy, collaborative learning, and critical thinking. The Public Authority for Applied Education and Training (PAAET) in Kuwait consists of more than 10 academic colleges with a total number of 120 faculty members. The College of Basic Education (CBE) is one of them. The implementation of e-learning at the College of Basic Education requires that all the learning community members, instructors and students, understand that an e-learning course is like a learning community with the privilege of sharing knowledge, opinions, experiences related to class subject, and productive outcomes that are beneficial to this learning community. This study indentified the statistically significant differences in demographic characteristics of e-learning adopters and non-adopters among faculty members at CBE, examining faculty members' attitudes and skills toward e-learning readiness. The study will explore perceived barriers that face e-learning at CBE. Applying the Rogers diffusion of innovation theory, the influence of 4 factors was examined regarding faculty readiness for …
Date: August 2010
Creator: Alajmi, Mohammed
System: The UNT Digital Library
The Works for Clarinet Commissioned by the Concours International d'Exécution Musicale de Genève: A Critical Survey and Performance Guide (open access)

The Works for Clarinet Commissioned by the Concours International d'Exécution Musicale de Genève: A Critical Survey and Performance Guide

Beginning in 1939, the Concours International d'Exécution Musicale de Genève (CIEM; Geneva International Music Competition) is unique among international music competitions in its multidisciplinary approach. To date, fifteen works have been commissioned for clarinet for the years in which the clarinet was involved. The most well-known of these works is the unaccompanied work by Heinrich Sutermeister, Capriccio for Solo Clarinet in A, written in 1946 for the 1947 competition. This work is a staple in the unaccompanied clarinet repertoire. However, the other fourteen works commissioned for the competition are little known and to date no document has been prepared that examines each of these works in the context of the competition and clarinet literature. While perhaps less notable, works were also commissioned for a sight reading portion of the competition for many of the years in which the clarinet was a discipline chosen for the competition, two of which were published. These works are examined as well. This survey provides a critical, analytical, historical, performance-related and biographical review of the published and unpublished works commissioned for the clarinet by CIEM. The composers, competitors and the significance of these works and winners in the clarinet literature and history are included. A …
Date: August 2010
Creator: Allgeier, Anthony Joseph, III
System: The UNT Digital Library
Soldier Boys of Texas: The Seventh Texas Infantry in World War I (open access)

Soldier Boys of Texas: The Seventh Texas Infantry in World War I

This study first offers a political, social, and economic overview of Texas during the first two decades of the twentieth century, including reaction in the Lone Star state to the declaration of war against Germany in April, 1917; the fear of saboteurs and foreign-born citizens; and the debate on raising a wartime army through a draft or by volunteerism. Then, focusing in-depth on northwest Texas, the study examines the Texas National Guard unit recruited there, the Seventh Texas Infantry Regiment. Using primarily the selective service registration cards of a sample of 1,096 members of the regiment, this study presents a portrait of the officers and enlisted soldiers of the Seventh Texas based on age, occupation, marital status, dependents and other criteria, something that has not been done in studies of World War I soldiers. Next, the regiment's training at Camp Bowie, near Fort Worth, Texas, is described, including the combining of the Seventh Texas with the First Oklahoma Infantry to form the 142nd Infantry Regiment of the Thirty-Sixth Division. After traveling to France and undergoing nearly two months of training, the regiment was assigned to the French Fourth Army in the Champagne region and went into combat for the first …
Date: August 2010
Creator: Ball, Gregory W.
System: The UNT Digital Library
The Keyboard Music of Peter Philips (open access)

The Keyboard Music of Peter Philips

The keyboard works of the English virginalist Peter Philips have been little studied in comparison with his more famous contemporaries, William Byrd, John Bull and Jan Pieterszoon Sweelinck. While Philips left comparatively fewer keyboard works than these composers, his music contains very unique attributes. This study compiles the latest research of Philips' life as well as an analysis of representative works showing many of the individual and uncommon features to be found in Philips' works for keyboard. Pieces from all genres of Philips' keyboard output are represented and discussed, including Pavanes and Galliards, Fantasias and Intabulations of madrigals. Musical examples of each of these works are provided. A description of the instruments needed for the performance of the music and an illustration of the rare type of keyboard instrument required in the Pavana and Galliarda Dolorosa is included. A discussion of Philips' style, particularly regarding ornamentation, is included with a comparison to the works of his contemporaries.
Date: August 2010
Creator: Bennight, Brad
System: The UNT Digital Library
Well-Being and Academic Success in Gifted College Students: Early-College Entrants and Honors College Students (open access)

Well-Being and Academic Success in Gifted College Students: Early-College Entrants and Honors College Students

As a society, we seek to have our young people, including the gifted, be healthy and happy, and go to good schools with good teachers. Framed by Sayler's theoretical model of giftedness and thriving, this study examined psychological constructs (i.e. general self-efficacy, theories of intelligence, hope, gratitude, religiosity, disposition, and resiliency) to determine their mediating effect on personal well-being and academic success in gifted college students. The 213 subjects for this study included gifted college students from two distinct programs at the University of North Texas. One hundred twenty-two participants were students from the Texas Academy of Mathematics and Science (TAMS). TAMS is an early-college entrance program allowing gifted students to enter college after their sophomore year of high school. Ninety-one participants attended the UNT Honors College. Honors College students are gifted students who enter college after high school graduation. Latent transition, latent class, general linear model repeated measures, and regression analyses were used in the examination of the data. Results of the study revealed that positive disposition and hope-agency were significantly related to the development of personal well-being for gifted students during their first year of college. The ability to identify pathways to goals and the self-theory of intelligence …
Date: August 2010
Creator: Boazman, Janette Kay
System: The UNT Digital Library
The Relationship Between Body Dissatisfaction and Eating Disorder Symptomatology: An Examination of Moderating Variables (open access)

The Relationship Between Body Dissatisfaction and Eating Disorder Symptomatology: An Examination of Moderating Variables

The purpose of this study was to examine whether Psychological Well-Being (comprised of self-esteem, optimism, satisfaction with life, and self-determination), perfectionism, body surveillance, and neuroticism moderated the relationship between body dissatisfaction and bulimic symptoms after controlling for social desirability and actual physical size. 847 female undergraduate students participated in the study. Participants completed an online questionnaire packet. An exploratory factor analysis determined that self-determination, optimism, self-esteem, and satisfaction with life loaded on to one factor representing Psychological Well-Being. Hierarchical moderated regression (HMR) was used to control for the influences of social desirability and body mass index on bulimic symptoms and then determine the main and interactive effects of body dissatisfaction and each moderator. Four variables (neuroticism, body surveillance, concern over mistakes, and doubts about actions) strengthened the relationship between body dissatisfaction and bulimic symptomatology, whereas Psychological Well-Being weakened the relationship. Parental expectations, parental criticism, and personal standards did not moderate the relationship between body dissatisfaction and bulimic symptomatology.
Date: August 2010
Creator: Brannan, Megan E.
System: The UNT Digital Library
Southern Promise and Necessity:  Texas, Regional Identity, and the National Woman Suffrage Movement, 1868-1920 (open access)

Southern Promise and Necessity: Texas, Regional Identity, and the National Woman Suffrage Movement, 1868-1920

This study offers a concentrated view of how a national movement developed networks from the grassroots up and how regional identity can influence national campaign strategies by examining the roles Texas and Texans played in the woman suffrage movement in the United States. The interest that multiple generations of national woman suffrage leaders showed in Texas, from Reconstruction through the ratification of the Nineteenth Amendment, provides new insights into the reciprocal nature of national movements. Increasingly, from 1868 to 1920, a bilateral flow of resources existed between national women's rights leaders and woman suffrage activists in Texas. Additionally, this study nationalizes the woman suffrage movement earlier than previously thought. Cross-regional woman suffrage activity has been marginalized by the belief that campaigning in the South did not exist or had not connected with the national associations until the 1890s. This closer examination provides a different view. Early woman's rights leaders aimed at a nationwide movement from the beginning. This national goal included the South, and woman suffrage interest soon spread to the region. One of the major factors in this relationship was that the primarily northeastern-based national leadership desperately needed southern support to aid in their larger goals. Texas' ability to …
Date: August 2010
Creator: Brannon-Wranosky, Jessica S.
System: The UNT Digital Library
Using Financial Rankings to Identify Characteristics of Libraries Serving Highly Profitable Private Law Firms (open access)

Using Financial Rankings to Identify Characteristics of Libraries Serving Highly Profitable Private Law Firms

This purpose of this study was to develop evidence of a relationship between law libraries and private law firm profitability for law library administrators to use when making strategic decisions that influence the value of their libraries. The highest ranked administrator at each private law firm listed on the 2008 Am Law 200 was invited to complete an online benchmarking survey. The adjusted sample population totaled 179 firms. Fifty-one valid surveys were completed for a 28.5% response rate. Descriptive and statistical analyses were conducted using 26 independent variables (law library characteristics) and a single dependent variable, Revenue per Equity Partner, developed from data published for the Am Law 200. The most significant contributions of this study are: development of important law library financial and return on investment benchmarks; a listing of characteristics that have been empirically shown to impact law firm productivity; identification of optimum reporting structure for the law library administrator. Six characteristics positively impact Revenue per Equity Partner: to whom the library Administrator reports, number of library staff per library, number of Library staff per library, range in hourly bill rate for library staff time, practice areas most often supported. Two monetary measures were also established. The cost …
Date: August 2010
Creator: Carroll, Margaret Aby
System: The UNT Digital Library
Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices (open access)

Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices

This research focused on the development of new metal triimine complexes of Pt(II), Pd(II), and Ni(II) for use in three types of molecular electronic devices: dye sensitized solar cells (DSSCs), organic light-emitting diodes (OLEDs), and organic field effect transistors (OFETs). Inorganic complexes combine many advantages of their chemical and photophysical properties and are processable on inexpensive and large area substrates for various optoelectronic applications. For DSSCs, a series of platinum (II) triimine complexes were synthesized and evaluated as dyes for nanocrystalline oxide semiconductors. Pt (II) forms four coordinate square planar complexes with various co-ligands and counterions and leads to spanning absorption across a wide range in the UV-Vis-NIR regions. When those compounds were applied to the oxide semiconductors, they led to photocurrent generation thus verifying the concept of their utility in solar cells. In the OLEDs project, a novel pyridyl-triazolate Pt(II) complex, Pt(ptp)2 was synthesized and generated breakthrough OLEDs. In the solution state, the electronic absorption and emission of the square planar structure results in metal-to-ligand charge transfer (MLCT) and an aggregation band. Tunable photoluminescence and electroluminescence colors from blue to red wavelengths have been attained upon using Pt(ptp)2 under different experimental conditions and OLED architectures. In taking advantage of …
Date: August 2010
Creator: Chen, Wei-Hsuan
System: The UNT Digital Library
Organized Semantic Fluency and Executive Functioning in an Adult Clinical Sample and a Community Sample (open access)

Organized Semantic Fluency and Executive Functioning in an Adult Clinical Sample and a Community Sample

The study investigated an organized semantic fluency task, (the Controlled Animal Fluency Task - CAFT) as a measure of executive functioning (EF) in adults, and the relationship with instrumental activities of daily living (IADL). Participants (N = 266) consisted of a clinical sample (n = 142) utilizing neuropsychological assessment data collected at an outpatient psychological center, and a community sample (n = 124). The clinical sample was a heterogeneous mixed neurological group including a variety of health conditions and comorbid anxiety and depression. The CAFT Animals by Size demonstrated a significant positive correlation with Category Fluency (r = .71, n = 142, p < .001) , Animal Fluency (r = .70, n = 142, p < .001), and with other, established neuropsychological measures. The CAFT Animals by Size condition demonstrated a significant moderate negative correlation with IADL for the sample as a whole (r = -.46, n = 248, p < .001), and for the clinical sample (r = -.38, n = 129, p < .001), but not for the community sample. In a hierarchical regression analysis, CAFT Animal by Size explained additional variance in IADL (&#916;R2 = .15). In a hierarchical regression analysis predicting IADL with the control variables …
Date: August 2010
Creator: Chlipala, M. Linda
System: The UNT Digital Library
Baptist Pastoral Leadership: An Analysis for Curriculum Development (open access)

Baptist Pastoral Leadership: An Analysis for Curriculum Development

Through a qualitative study utilizing in-depth interviews, practitioner opinion was gathered regarding how Christian institutions of higher education, primarily Baptist seminaries, may better utilize formal and continuing education to prepare clergy for pastoral leadership. The sample of ten subjects for this study, drawn from the 550 active senior pastors in the Dallas Baptist Association and the Kauf-Van Baptist Association, was selected based on a maximum variation sampling method. The intention was to provide a better understanding of the leadership skills required by senior pastors, to help develop pastoral ministries curriculum and to assess the potential effectiveness of continuing education for pastoral leadership. The subjects indicated that the formal degree program of their seminary did equip them with the basic knowledge needed for pastoral leadership but it did not provide them in sufficiency with the necessary, practical skills for pastoral leadership. The pattern that emerged from the data indicates that, overall, seminaries are providing a quality education in preparing pastors for the ministry in their formal degree plans. However, seminaries may have opportunities to be of further service and to gain a competitive advantage vis a vis other seminaries by enhancing and expanding their continuing education programs.
Date: August 2010
Creator: Christine, David Wayne
System: The UNT Digital Library
An Experimental Examination of the Effects of Fraud Specialist and Audit Mindsets on Fraud Risk Assessments and on the Development of Fraud-Related Problem Representations (open access)

An Experimental Examination of the Effects of Fraud Specialist and Audit Mindsets on Fraud Risk Assessments and on the Development of Fraud-Related Problem Representations

Fraud risk assessment is an important audit process that has a direct impact on the effectiveness of auditors' fraud detection in an audit. However, prior literature has shown that auditors are generally poor at assessing fraud risk. The Public Company Accounting Oversight Board (PCAOB) suggests that auditors may improve their fraud risk assessment performance by adopting a fraud specialist mindset. A fraud specialist mindset is a special way of thinking about accounting records. While auditors think about the company's recorded transactions in terms of the availability of supporting documentations and the authenticity of the audit trail, fraud specialists think instead of accounting records in terms of the authenticity of the events and activities that are behind the reported transactions. Currently there is no study that has examined the effects of the fraud specialist mindset on auditors' fraud risk assessment performance. In addition, although recent studies have found that fraud specialists are more sensitive than auditors in discerning fraud risk factors in situation where a high level of fraud risk is present, it remains unclear whether the same can be said for situation where the risk of fraud is low. Thus, the purpose of my dissertation is to examine the effects …
Date: August 2010
Creator: Chui, Lawrence
System: The UNT Digital Library
"The Wider View": Engaging a New Generation of Singers through African-American Art Song (open access)

"The Wider View": Engaging a New Generation of Singers through African-American Art Song

Through studying the poetry and its context, the lives of the poets and composers, and the musical choices which emerged from these combined influences, students of the "Millennial" generation may experience a deeper connection to art song and its role in defining and reflecting national character. Not yet a part of the traditional canon of American art song, the songs of African-American composers are of particular value in this regard, offering teachers, students, and recitalists less frequently-performed repertoire to explore. Representing a broad spectrum of literary and cultural influences, these songs are just as diverse, multi-faceted, and full of variety as any other body of art song repertoire and richly contribute to the past and present life of the genre. Going beyond the music and the words can only reinforce the study of technique and enrich the studio experience, while at the same time providing a multicultural learning environment which more accurately reflects the America in which these same students will become the singers and voice teachers of tomorrow.
Date: August 2010
Creator: Ciobanu, Jennifer Odom
System: The UNT Digital Library
The Cimbasso and Tuba in the Operatic Works of Giuseppe Verdi: A Pedagogical and Aesthetic Comparison (open access)

The Cimbasso and Tuba in the Operatic Works of Giuseppe Verdi: A Pedagogical and Aesthetic Comparison

In recent years, the use of the cimbasso has gained popularity in Giuseppe Verdi opera performances throughout the world. In the past, the tuba or the bass trombone was used regularly instead of the cimbasso because less regard was given to what Verdi may have intended. Today, one expects more attention to historical precedent, which is evident in many contemporary Verdi opera performances. However, the tuba continues to be used commonly in performances of Verdi opera productions throughout the United States. The use of the tuba in the U.S. is due to a lack of awareness and a limited availability of the cimbasso. This paper demonstrates the pedagogical and aesthetic differences between the use of the tuba and the modern cimbasso when performing the works of Giuseppe Verdi operas.
Date: August 2010
Creator: Costantino, Alexander
System: The UNT Digital Library
A Trumpeter's Guide to Samuel Barber's Capricorn Concerto (open access)

A Trumpeter's Guide to Samuel Barber's Capricorn Concerto

Samuel Barber's Capricorn Concerto for flute, oboe and trumpet with strings is an important though seldom performed work. The concerto is teeming with performance choices that are indicative of both historical and contemporary influences. At present, there are limited resources available to performers regarding Capricorn. The first section of this study presents an historical and contextual examination of Capricorn both in terms of Barber's own compositional output and that of his influences and contemporaries. The second section includes a performance analysis of the work, while the third section includes an analysis of existing recordings. Implications for the performer are outlined in last section. The guide provides performers with pertinent background, analytical and performance information in order to facilitate informed, high-level performance.
Date: August 2010
Creator: Crafton, Jason Allen
System: The UNT Digital Library
The Transfer and Sustainability of a School-Wide Writing Program: Year 2. (open access)

The Transfer and Sustainability of a School-Wide Writing Program: Year 2.

Writing is an important life skill that all students need in order to succeed in today's society. However, proficient writing skills develop over time, requiring years of quality instruction combined with motivation, encouragement, and lots of practice. School-wide writing is an approach that provides specific writing instruction in a consistent manner across all grade levels, allowing students to develop increasingly complex writing skills and strategies over time. Implementation of programs, such as school-wide writing, requires teachers to transfer new understandings and skills from the training room to the classroom as well as efforts to sustain the program over time. This multiple case study examines the characteristics of an elementary school-wide writing program that was introduced in the field by local teachers and transferred five years later to another school in the same district. The study also examines factors affecting the transfer and sustainability of the program during the second year of implementation. Findings from the study indicate that the elements of school-wide writing transferred from School 1 to School 2 at a low road level of transfer. Factors affecting transfer included inquiry, ongoing training, support systems, authentic writing experiences, and time. Factors contributing to sustainability included ongoing support, accountability, communication, …
Date: August 2010
Creator: Dickson, Violet Myers
System: The UNT Digital Library
Effects of Adult Romantic Attachment and Social Support on Resilience and Depression in Patients with Acquired Disabilities (open access)

Effects of Adult Romantic Attachment and Social Support on Resilience and Depression in Patients with Acquired Disabilities

The acquirement of a disability (e.g., spinal cord injury, traumatic brain injury, amputation, multi trauma) is a risk factor for psychological disturbance (e.g., depression). Research has established that social support and secure attachment are protective factors against psychological disturbance. Attachment patterns have also been associated with differences in perceived social support. Secure attachment and higher perceived social support have been implicated in greater levels of resilience but need to be validated with a population of individuals who have acquired a disability. The Experiences in Close Relationships, Social Provisions Scale, Connor-Davidson Resilience Scale, Personal Health Questionnaire - 9 Depression Scale, and a Demographic were administered to 102 adult inpatients at a rehabilitation hospital undergoing an individualized rehabilitation program. Two MANOVAs were conducted to examine the direct associations of attachment classifications with the major dependent variables, as well as the various social support subscales. Path analysis tested two mediational models suggested by literature. Model 1 assessed the mediating role of attachment anxiety and attachment avoidance on the effect of social support on depression and resilience. Model 2 assessed the mediating role of social support on the effect of attachment anxiety or attachment avoidance on depression and resilience. Partial support was obtained for …
Date: August 2010
Creator: Dodd, Zane
System: The UNT Digital Library
Factors Affecting Revictimization in Survivors of Childhood Sexual Abuse (open access)

Factors Affecting Revictimization in Survivors of Childhood Sexual Abuse

Structural equation modeling was used to examine how childhood sexual abuse (and other associated variables, such as family functioning and experiencing multiple forms of abuse) relates to revictimization and psychological distress. Participants were women who participated in Project HOW: Health Outcomes of Women interviews, a longitudinal study that spanned six waves of interviews. Only women with a history of childhood sexual abuse were included in the present study (n=178). Experiencing nonsexual child maltreatment in addition to childhood sexual abuse appears directly related to adult sexual and physical revictimization and indirectly related to psychological distress. Childhood sexual abuse alone was not predictive of revictimization or psychological abuse. This suggests that other mediating factors may explain the relation between CSA and revictimization found in other research. Clinical implications based on the results of the present study emphasize the importance of identifying children who have experienced multiple forms of abuse as particularly at risk for future victimization. In addition, providing interventions with a focus on education and empowerment might decrease risk for future violence and subsequent emotional maladjustment. Potential future research could examine the treatment outcomes and efficacy of these interventions as well as identify those mediating factors that increase the risk for …
Date: August 2010
Creator: Ericksen, Stephanie J.
System: The UNT Digital Library
Anxiety, Depression, and Sleep Disorders: Their Relationship and Reduction with Neurotherapy (open access)

Anxiety, Depression, and Sleep Disorders: Their Relationship and Reduction with Neurotherapy

This study investigated the relationship among anxiety, depression, and sleep disturbances and the treatment of these three disorders through neurotherapy. Research suggests that these conditions commonly co-occur in the general population and that central nervous system (CNS) arousal may play a primary role in the development and maintenance of these disorders. Several recent studies suggested that neurotherapy, a biofeedback-based treatment for CNS dysregulation, might be an effective treatment for comorbid conditions, particularly the ones of interest here, depression, anxiety, and sleep disturbances. This investigation used a clinical case-series design to assess pre/post neurotherapy changes on objective measures of anxiety, depression, and sleep and to determine whether changes in anxiety and depression then predict improvements in sleep quality. Data for 23 participants (10 males) were obtained from files of adults (Mage = 40.22 years, SD = 16.20) who received at least 15 neurotherapy sessions (M = 47.83 sessions, SD = 22.23) the University of North Texas Neurotherapy Lab. Matched pair t-tests revealed that symptoms of sleep disturbance, depression, and anxiety showed significant improvements following neurotherapy. Neurotherapy treatment effect sizes generally ranged from moderate to large (d = .414 - .849). Multiple regression analysis found that changes in self-reported anxiety symptoms, but …
Date: August 2010
Creator: Fisher, Christopher, Alan
System: The UNT Digital Library
Effects of a Near-Death Experience Learning Module on Grief (open access)

Effects of a Near-Death Experience Learning Module on Grief

The researcher examined the effectiveness of a near-death experience (NDE) learning module on reducing distressing aspects and enhancing a growth aspect of grief among bereaved adults. Participants were 22 females and 2 males; 2 identified as African American, 3 as Asian, 2 as Latina/o, and 17 as White; aged 20 to 71 years with mean age 35.3 years. In this experimental design, the researcher randomly assigned 12 participants to the experimental group and 12 participants to the waitlist no treatment control group. Participants in the experimental group received the NDE learning module intervention, which consisted of 3 sessions over consecutive weeks. Six research questions were explored. A two-factor repeated measures analysis of variance was performed on five dependent variables to determine if the two groups performed differently across time according to the pretest and posttest results of the Despair, Panic Behavior, Personal Growth, Detachment, and Disorganization subscales of the Hogan Grief Reaction Checklist (HGRC). A one-way analysis of covariance was performed on one dependent variable to determine if the groups were statistically different according to the posttest results of the Blame and Anger subscale of the HGRC. Additionally, univariate eta squared was hand calculated to determine practical significance. Findings indicated …
Date: August 2010
Creator: Foster, Ryan D.
System: The UNT Digital Library
The Reasons for the Divergence of IPO Lockup Agreements (open access)

The Reasons for the Divergence of IPO Lockup Agreements

Most initial public offerings (IPOs) feature share lockup agreements, which prohibit insiders from selling their shares for a specified period of time following the IPO. However, some IPO firms agree to have a much longer lockup period than other IPO firms, and some are willing to lockup a much larger proportion of shares. Thus, the primary research question for this study is: "What are the reasons for the divergence of the lockup agreements?" The two main hypotheses that this dissertation investigates are the signaling hypothesis based on information asymmetry, and the commitment hypothesis based on agency theory. This study uses methods that have not been applied by previous studies in the literature relating to IPO lockups. First, I directly use IPO firms operating performance as a proxy for firm quality. The results show neither a negative nor a strong positive relationship between lockup length and firm operating performance. Thus, based on operating performance, the evidence does not support the agency hypothesis while showing weak support for the signaling hypothesis. I then examine the long-run returns for IPO firms with different lockup lengths. I find that firms with short lockup lengths have much better long-run returns than firms with long lockup …
Date: August 2010
Creator: Gao, Fei
System: The UNT Digital Library
The Influence of in Vitro Gill and Liver Metabolism of Xenobiotics on Fish Bioconcentration (open access)

The Influence of in Vitro Gill and Liver Metabolism of Xenobiotics on Fish Bioconcentration

This dissertation examines the ability of in vitro biotransformation assays to provide an indication of metabolic potential. The potential for xenobiotic compounds to bioconcentrate in aquatic organisms is expressed through the bioconcentration factor (BCF). The metabolic loss of ibuprofen, norethindrone and propranolol was measured using rainbow trout (Oncorhynchus mykiss) and channel catfish (Ictalurus punctatus) gill and liver S9 fractions, microsomes and cell suspensions. Metabolic transformation rates (kM) were extrapolated from in vitro intrinsic clearance of parent compound (CLm) and integrated into a refined BCF model. In general, CLm of test compounds was greater in liver S9 fractions and hepatocytes. However, the influence of hepatic metabolism on kM and BCF was limited by hepatic blood flow (20-25%) compared to gill blood flow (~100%). A significant difference was noted between BCF solely based on KOW and BCF including kM. These studies indicate that the inclusion of kM in BCF models can bring predicted bioconcentration estimates closer to in vivo values. Primary cell suspensions are preferred over subcellular fractions as cell suspensions possess both phase I and phase II enzyme activity. Further study was conducted on ibuprofen biotransformation pathways. As fish do not contain the same cytochrome P450 (CYP) 2C homologs known to …
Date: August 2010
Creator: Gomez, Cristi Frasier
System: The UNT Digital Library
The Relationship Between Sleep Variables and Headache (open access)

The Relationship Between Sleep Variables and Headache

Headache pain impacts most of the population at some point in life, at an enormous cost to day-to-day functioning. Determination of the variables that are associated with prevalence and severity of headaches has been inconsistent. One area that deserves more attention is the relationship between headaches and sleep. For instance, several sleep parameters may precipitate or exacerbate headaches, but previous research often used inconsistent and limited assessments of both headaches and sleep, making results difficult to interpret and compare. The current study seeks to extend previous research by using more comprehensive and empirically validated assessment techniques to study the relationship between sleep and headaches in a healthy sample. Greater self-reported sleep quality is related to lower headache frequency and severity, and lower self-reported sleep quality is characteristic of individuals having migraine-type headaches. Greater sleep efficiency is related to lower headache severity and shorter headache duration. Greater sleep onset latency is related to longer headache duration and greater headache severity. Greater number of nighttime awakenings is related to greater headache severity and is characteristic of individuals having a diagnosable headache disorder (either tension-type or migraine-type). Stress appeared to be a partial mediator between self-reported sleep quality and headache severity. Further experimental …
Date: August 2010
Creator: Grieser, Emily Ann
System: The UNT Digital Library
Relationships Among and Between Early and Late Freshmen Admission Applications and Academic Persistence (open access)

Relationships Among and Between Early and Late Freshmen Admission Applications and Academic Persistence

This quantitative study investigated relationships among and between university early and late admitted freshmen and academic performance and persistence. The participants in this study consisted of 3,197 early freshmen applicants and 309 late freshmen applicants admitted at a large southwestern student centered public research university over the course of the year prior to the fall 2008 academic year. Significant results, using a statistical significance level of p < .05, were reported for the majority of variables examined: chi-square analysis revealed a significant relationship between application date and ethnicity; independent-samples t-tests revealed significant differences in SAT scores; 78.06% of late applicants were male compared to 40.83% of early applicants; mean GPA of early applicants was 2.62 compared to 2.18 among those who applied late; and lastly, 76.62% of early applicants returned the following year in comparison to 57.42% of late applicants. The results of this study provide preliminary support for the examination of admission policies and procedures in relation to late application. Recommendations are made for advising, counseling, and other interventions that may ease the transition of freshmen late applicants while enhancing retention and persistence.
Date: August 2010
Creator: Hale, Lynne Rochelle
System: The UNT Digital Library