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Adult Client Outcomes: Differences Between Counselors with Education in Child Centered Play Therapy Versus Counselors Without Education in Child-Centered Play Therapy (open access)

Adult Client Outcomes: Differences Between Counselors with Education in Child Centered Play Therapy Versus Counselors Without Education in Child-Centered Play Therapy

Child-centered play therapists are taught unique relationship building approaches and therapeutic methods to utilize when working with children. The purpose of this study was to determine if adult clients counseled by child-centered play therapists would demonstrate greater positive therapeutic outcomes than adult clients who were counseled by non-educated child-centered play therapists. This study also attempted to determine if the play therapists' clients would show greater, significant improvement in any particular areas of client distress (i.e., depression/anxiety, relationship issues), more so than the clients of the non-play therapists. Archival data from an assessment, The Adult Self-Report Inventory (ASR), was gathered to measure reported pre and post-test client symptomology. This study utilized a 2X2 repeated measure ANOVA design to analyze the impact of counselors who were educated in child-centered play therapy who saw adult clients, versus their non-play therapy counterparts who saw adult clients. Before treatment pre-test and after treatment post-test administration was collected for use in the analysis. The population consisted of 60 adult clients seeking counseling services at a major university in the southwest. All clients were seen by Master's practicum students for ten sessions. The clients were divided into two groups - 30 were seen by play therapists, 30 …
Date: August 2007
Creator: Rees, Brian Christopher
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Adult Learner Satisfaction with Web-Based Non-Credit Workforce Training. (open access)

Adult Learner Satisfaction with Web-Based Non-Credit Workforce Training.

Web-based training has become a billion dollar industry in the United States. Electronically aided learning is viewed by many companies as a cost-effective way to deliver the up-to-date, up-gradable job-related training that the industry is demanding. This study sought to examine the relationship between learners’ satisfaction with online training as it relates to learner readiness, online features, and course relevance. The population for this study was adults seeking non-credit workforce training, specifically library professionals who were involved in web-based training through the Lifelong Education @ Desktop (LE@D) program at the University of North Texas, Denton. Online methods of training are used most extensively in the area of mandatory or compliance training, in which 35 % of training is conducted mostly or completely online. The total potential library population using LE@D product to date is approximately 4,000 unique enrollments nationwide. Participants were selected from a complete list of unique LE@D users over a 90-day period. A survey instrument was sent via e-mail to 514 enrollees who had completed a recent LE@D online training course. In total, 254 participants responded to the survey. Bivariate analysis of the variables using the Pearson product-moment correlation was used to determine the occurrence and strength of …
Date: August 2007
Creator: Morgan, Pamela Cope
Object Type: Thesis or Dissertation
System: The UNT Digital Library
AGenesis: A Novel (open access)

AGenesis: A Novel

AGenesis is a novel of "postmortal fiction" set entirely in an afterlife. Nessie, a recently dead woman, accidentally kills an already-dead man, and in the confusion that follows, sets out to discover how he could have died and what after-afterlife he might have gone to. During her travels, she is raped and then help captive by a city of tormented souls; she descends into madness until rescued by children, and she and her newborn but "undead" daughter set out again, this time to find the end of the afterlife. Nessie's daughter eventually seeks a way to enter a living world she's never known, while Nessie tries to end her suffering and find peace.
Date: December 2007
Creator: Snoek-Brown, Samuel Jeremiah
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Alberto Grau: The Composer, Selected Works, and Influence upon the Venezuelan and International Choral Community (open access)

Alberto Grau: The Composer, Selected Works, and Influence upon the Venezuelan and International Choral Community

Alberto Grau is arguably one of the most influential contemporary Venezuelan choral composers and conductors of the twentieth and twenty-first centuries. This thesis explores the synthesis of Venezuelan nationalism with global internationalism found within his works. As a student of the nationalistic generation of composers (Vicente Emilio Sojo, Juan Bautista Plaza, and Ángel Sauce) Grau's works display the distinct characteristics found in Venezuelan music. His output also exhibits international influences, using texts associated with social and environmental events and concerns including literary and musical influences of other nations and cultures. The first section of the thesis traces the lineage of Venezuelan choral composers beginning with the colonial period and the Escuela de Chacao to the nationalistic composers from the Santa Capilla generation. The second section describes Alberto Grau's compositional style as exemplified in his work Kasar mie la gaji (The Earth is Tired). The final section of the document comprises interviews with Alberto Grau and his wife, the Venezuelan choral conductor, María Guinand. Guinand studied piano and conducting with Alberto Grau and was his assistant at the Orfeón Universitario Simón Bolívar and the Schola Cantorum de Caracas. She is the founding conductor of the Cantoría Alberto Grau and the editor …
Date: August 2007
Creator: Yu, Julie
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The American Trumpet Sonata in the 1950s: An Analytical and Sociohistorical Discussion of Trumpet Sonatas by George Antheil, Kent Kennan, Halsey Stevens, and Burnet Tuthill. (open access)

The American Trumpet Sonata in the 1950s: An Analytical and Sociohistorical Discussion of Trumpet Sonatas by George Antheil, Kent Kennan, Halsey Stevens, and Burnet Tuthill.

The trumpet, or some ancestral form of the trumpet, has existed nearly as long as civilization itself. Despite its long history, however, the trumpet's solo repertoire remained limited and relatively unvaried until the second half of the twentieth century. Like most music, the American trumpet sonatas from the 1950s are a reflection of the culture and history surrounding their composition. The purpose of this research is to show how the trumpet sonatas by George Antheil, Kent Kennan, Halsey Stevens, and Burnet Tuthill are both distinctly American and unmistakably from the 1950s. The post-war era in America is often viewed as a time of unbridled optimism stemming from economic prosperity and the nation's military and industrial supremacy. The decade of the 1950s is often viewed today as a simpler, happier time in America's history. The trumpet sonatas of this era reflect this primarily in their ebullient rhythms and brilliant, often heroic melodies. However, darker characteristics of the decade (the rise of communism, for example) also make veiled appearances in these four sonatas. After an overview of the social and musical trends of the decade, the central chapter of the work delineates formal, thematic, and tonal structures of each of the four …
Date: August 2007
Creator: Dearden, Jennifer Lorien
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Analysis of Changes in Perceptions of Certified Athletic Trainers from 1996 to 2006 on the Women in Athletic Training Survey (open access)

An Analysis of Changes in Perceptions of Certified Athletic Trainers from 1996 to 2006 on the Women in Athletic Training Survey

This study investigates how perceptions vary in athletic trainers regarding issues pertaining to women in the profession. Subjects included 1500 male and 1500 female certified athletic trainers who responded to 44 demographic and perceptions survey items used to determine whether perceptions were different based on the respondent's gender. Results were compared to a previously disseminated survey in 1996 to also determine if perceptions had changed from 10 years earlier. Results regarding the presentation of awards and the attainment of leadership positions in the organization were also compared to actual data collected. The data suggested that males perceptions had not changed, but females' perceptions had changed, in that females perceived that opportunities had improved. Data regarding the number of females who had ascended to leadership positions or had received awards did not support these perceptions, however, and female athletic trainers continue to struggle to obtain equality in both of these areas. Additionally, homosocial reproduction continues to influence the decreased number of women who are hired into various jobs, or advance into leadership positions, maintaining patriarchy in the athletics arena and in the athletic training organizations. Results suggested that because athletic training has been dominated by men since its inception, patriarchy continues …
Date: May 2007
Creator: Dieringer, Katherine I.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Analysis of the Benefits of the Student Success Initiative in the 3rd and 5th Grades in a District in Texas. (open access)

An Analysis of the Benefits of the Student Success Initiative in the 3rd and 5th Grades in a District in Texas.

The state of Texas passed the Student Success Initiative (SSI) in 1999 which requires all 3rd graders to pass the reading portion of the Texas Assessment of Knowledge and Skills (TAKS) test to be promoted to the 4th grade, and for 5th graders to pass the reading and math portions of the TAKS test to be promoted to the 6th grade. Beginning in spring 2008, 8th graders will also need to pass the reading and math portions of the TAKS test to be promoted to the 9th grade. The purpose of this study was to examine the academic performance of 3rd and 5th grade students who did not meet the passing standard on the TAKS test and were retained during the 2005-2006 school year. The population of this study included 33 3rd graders and 49 5th graders who were retained during the 2005-2006 school year due to not meeting the promotion requirements of the SSI. There was also a second population of 49 5th graders who were retained in 3rd grade during the 2003-2004 school year due to not meeting the promotion requirements of the SSI. These students were enrolled in the 5th grade for the first time during the …
Date: May 2007
Creator: Neblett, Pamela S.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Analysis of the Characteristics of Female Juvenile Offenders as Predictors of Resocialization or Recidivism. (open access)

An Analysis of the Characteristics of Female Juvenile Offenders as Predictors of Resocialization or Recidivism.

Because there has been a paucity of research on the educational needs of females with academic, behavioral, and emotional problems involved with the juvenile justice system, this study has been an attempt to classify and compare specific characteristics of this population. In particular, it examined their demographics, disability prevalence rates, along with academic, behavioral, and emotional functioning levels, in order to further understand their relationship to the resocialization or recidivism of the different groups of female juveniles incarcerated in the state of Texas, and contribute to the research for further developing successful prevention and intervention programs. Various demographic factors of the female juveniles in this study were examined: (a) offender type, (b) county of commitment, (c) race/ethnicity, (d) age at first referral, and (e) English language proficiency. Prevalence rates of special education disabilities were determined. Academic functioning was measured by (a) IQ; (b) last school grade completed; (c) Test of Adult Basic Education (TABE) reading gain score; and (d) TABE math gain score. Behavioral functioning was indicated through (a) offense history, (b) documented behavior incidents, and (c) total risk score. Emotional functioning included DSM-IV diagnoses and treatment needs. Due to the design of the research being a descriptive exploration, the …
Date: May 2007
Creator: Aiello, Jan Elizabeth
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Analysis of the Expression Profiles of Two Isoforms of the Antifungal Protein Osmotin from Gossypium hirsutum (open access)

Analysis of the Expression Profiles of Two Isoforms of the Antifungal Protein Osmotin from Gossypium hirsutum

The expression of two cotton osmotin genes was evaluated in terms of the mRNA and protein expression patterns in response to chemical inducers such as ethylene, hydrogen peroxide, and sodium chloride. Reverse transcriptase-polymerase chain reactions (RT-PCR) indicated that osmotin mRNAs are expressed constitutively in root tissues of cotton plants, and that they are rapidly induced in leaf and stem tissues upon ethylene treatment. Real time RT-PCR indicated that osmotin transcript levels were induced 2 to 4 h after treatment with ethephon. The osmotin mRNA levels appear to increase 12 h after treatment, decrease, and then increase again. The osmotin protein expression patterns were analyzed in Western blot analyses using an anti-osmotin antibody preparation. A 24-KDa protein band was detected from cotton plants treated with the inducers. The 24-KDa osmotin proteins were induced 4 h after treatment with ethephon, while down-regulated 96 h after treatment. Multiple osmotin isoforms were observed to be induced in cotton plants upon treatment with ethephon by two-dimensional gel electrophoresis. One goal of this dissertation research was to genetically engineer two cotton osmotin genes to routinely overproduce their antifungal proteins in transgenic Arabidopsis and cotton plants as a natural defense against fungal infections, using co-cultivation with Agrobacterium …
Date: May 2007
Creator: Spradling, Kimberly Diane
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Analytical Study of Mily Alekseyevich Balakirev's Musical Style in his Early Piano and Orchestra Works: Grande Fantaisie on Russian Folk Songs and Concerto Op.1 in F# Minor. (open access)

An Analytical Study of Mily Alekseyevich Balakirev's Musical Style in his Early Piano and Orchestra Works: Grande Fantaisie on Russian Folk Songs and Concerto Op.1 in F# Minor.

Balakirev's two early piano and orchestra works, Grande Fantaisie on Russian Folk Songs and Concerto Op. 1 in F# Minor, were composed in the middle of the nineteenth century when in Russia there were no particularly important works for piano and orchestra. Balakirev was still a teenager when he wrote these two pieces and unfortunately both remained unfinished. However the beauty and remarkable compositional achievement of these works should be highly recognized. There are six chapters in this essay. The general background, purpose and the state of research are discussed in the first chapter. The second chapter presents Balakirev's biographical information and the overview of his works for piano and orchestra is stated in Chapter III. Individual works, Grande Fantaisie and Concerto in F# Minor are discussed in the chapters IV and V, which including discussing compositional background, analysis and diagram of structural schemes. The last chapter concludes with Balakirev's contribution to Russian music and the development of the Russian concerto coming into its own. It deals particularly with Balakirev's approach to folk songs, which gives the concerto a unique Russian aesthetic, in addition to his ability to write in the European tradition.
Date: May 2007
Creator: Kim, Miyang
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Anderson Localization in Two-Channel Wires with Correlated Disorder: DNA as an Application (open access)

Anderson Localization in Two-Channel Wires with Correlated Disorder: DNA as an Application

This research studied the Anderson localization of electrons in two-channel wires with correlated disorder and in DNA molecules. It involved an analytical calculation part where the formula for the inverse localization length for electron states in a two-channel wire is derived. It also involved a computational part where the localization length is calculated for some DNA molecules. Electron localization in two-channel wires with correlated disorder was studied using a single-electron tight-binding model. Calculations were within second-order Born-approximation to second-order in disorder parameters. An analytical expression for localization length as a functional of correlations in potentials was found. Anderson localization in DNA molecules were studied in single-channel wire and two-channel models for electron transport in DNA. In both of the models, some DNA sequences exhibited delocalized electron states in their energy spectrum. Studies with two-channel wire model for DNA yielded important link between electron localization properties and genetic information.
Date: December 2007
Creator: Bagci, V. M. Kemal
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Antecedents of the Psychological Adjustment of Children and Grandparent Caregivers in Grandparent-Headed Families (open access)

Antecedents of the Psychological Adjustment of Children and Grandparent Caregivers in Grandparent-Headed Families

Grandparent-headed families are diverse in nature and represent a rapidly growing family type. While challenges facing grandparent caregivers are well documented, less is known about the well-being of their grandchildren, with many early studies relying on small samples of convenience. This study used an existing large national database, the National Survey of America's Families (NSAF), to compare differences in well-being of both children and grandparent caregivers across the independent variables of family type, ethnicity, gender, and age. Findings suggested better mental health and less parental aggravation for caregivers in traditional two parent intact families as compared to grandparents co-parenting in a multi-generation home, skipped generation grandparents (raising their grandchild with no parent present) or single parents. Skipped generation grandparents in particular reported most caregiver aggravation. Child physical health was reported to be worse by skipped generation grandparent caregivers. Behavior problems were reported to be worse for children in grandparent headed households than those in traditional families, particularly for teenagers raised in skipped generation households by their grandmothers. Specific results, limitations and future directions for research on grandparent-headed households were discussed.
Date: December 2007
Creator: Jooste, Jane Louise
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Applying Cognitive Load Theory to the Design of Online Learning. (open access)

Applying Cognitive Load Theory to the Design of Online Learning.

The purpose of the study was to investigate the application of cognitive load theory to the design of online instruction. Students in three different courses (N = 146) were measured on both learning performance and perceptions of mental effort to see if there were any statistically significant differences. The study utilized a quasi-experimental posttest-only control group design contrasting modified and unmodified instructional lessons. Both groups were given a posttest to measure knowledge gained from the lesson (cognitive domain of learning) and perceptions of mental effort involved. Independent samples t-tests were used to compare the mean performance scores of the treatment groups (i.e. the sections using redesigned materials) versus the control groups for all three courses. Cohen's d was also computed to determine effect size. Mental effort scores were similarly compared for each group on the overall cognitive load score, for a total of six data points in the study. Of the four hypotheses examined, three (H1, H2, H4) found no statistically significant difference between the experimental and control groups. Negative significance was found between the experimental and control group on the effect of modality (H3). On measures of cognitive load, no statistically significant differences were found.
Date: May 2007
Creator: Burkes, Kate M. Erland
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Are Online Catalogs for Children Giving Them What They Need? Children's Cognitive Development and Information Seeking and Their Impact on Design (open access)

Are Online Catalogs for Children Giving Them What They Need? Children's Cognitive Development and Information Seeking and Their Impact on Design

Research shows children in an online environment often search by browsing, which relies heavily on recognition and content knowledge, so catalog systems for children must use effective symbols or pictorial representations, which correspond with children's own cognitive schema and level of recognition knowledge. This study was designed to look at the success of young children (ages 5 to 8) in searching 3 online public library catalogs designed for them, and it focused specifically on the pictorial representations and text descriptors used in the systems' browsing hierarchy. The research sought answer whether young children (ages 5 to 8) are really poor searchers because of cognitive development and lack of technology skills or if system design is the major reason for poor search results; i.e., Do current children's online catalog designs function in a manner that is compatible with information seeking by children? Although these results can not be generalized, this study indicates that there was a disconnect between the cognitive abilities of young users and catalog design. The study looked at search success on the 3 catalogs in relation to the catalog characteristics and individual user characteristics and makes 3 significant contributions to the field of library and information science. The …
Date: August 2007
Creator: Creel, Stacy
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Around the Fibonacci Numeration System (open access)

Around the Fibonacci Numeration System

Let 1, 2, 3, 5, 8, … denote the Fibonacci sequence beginning with 1 and 2, and then setting each subsequent number to the sum of the two previous ones. Every positive integer n can be expressed as a sum of distinct Fibonacci numbers in one or more ways. Setting R(n) to be the number of ways n can be written as a sum of distinct Fibonacci numbers, we exhibit certain regularity properties of R(n), one of which is connected to the Euler φ-function. In addition, using a theorem of Fine and Wilf, we give a formula for R(n) in terms of binomial coefficients modulo two.
Date: May 2007
Creator: Edson, Marcia Ruth
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Assessment of a Library Learning Theory by Measuring Library Skills of Students Completing an Online Library Instruction Tutorial (open access)

Assessment of a Library Learning Theory by Measuring Library Skills of Students Completing an Online Library Instruction Tutorial

This study is designed to reveal whether students acquire the domains and levels of library skills discussed in a learning library skills theory after participating in an online library instruction tutorial. The acquisition of the library skills is demonstrated through a review of the scores on online tutorial quizzes, responses to a library skills questionnaire, and bibliographies of course research papers. Additional areas to be studied are the characteristics of the participants enrolled in traditional and online courses at a community college and the possible influence of these characteristics on the demonstrated learning of library skills. Multiple measurement methods, identified through assessment of library instruction literature, are used to verify the effectiveness of the library skills theory and to strengthen the validity and reliability of the study results.
Date: May 2007
Creator: Watson, Dana L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
"Between the Staves" - Adaptations of Debussy's Six épigraphes antiques and Creative Tasks of the Performer (open access)

"Between the Staves" - Adaptations of Debussy's Six épigraphes antiques and Creative Tasks of the Performer

The Six épigraphes antiques represent a cross-section of Debussy's creative output that traces the composer's germ-seed from his original setting of the work in 1901 as incidental music to accompany the recitation of several poems, to the four-hand piano version of 1914, and its consequent reduction for solo piano. What can be gleaned by the methods of derivation from his original sketches to the final, mature works is an understanding of Debussy's use of musical metaphor and his connection to the poetry - the Chansons de Bilitis of Pierre Louÿs. Embedded literary procedures create a new musical expression of the work whereby text and music become integrated. Rather than serving as accompaniment to the poems, the Épigraphes function as the primary vessel for the conveyance of these ancient scenes. Several of Debussy's hallmark symmetrical and structural moulds, such as the whole-tone, chromatic, octatonic, and mirroring techniques reflect the omnipresent symmetry of Classical Greece. Various other artistic creations emanated from the Épigraphes, most significantly the orchestration of Ernest Ansermet in 1939. A look at the techniques used by Ansermet for the augmentation of the piano work serves to extrapolate the multifarious layers relevant in performance. In order to facilitate the four-hand …
Date: December 2007
Creator: Astilla, Christopher
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Beyond the "Year of Song": Text and Music in the Song Cycles of Robert Schumann after 1848 (open access)

Beyond the "Year of Song": Text and Music in the Song Cycles of Robert Schumann after 1848

In recent years scholars have begun to re-evaluate the works, writings, and life of Robert Schumann (1810-1856). One of the primary issues in this ongoing re-evaluation is a reassessment of the composer's late works (roughly defined as those written after 1845). Until recently, the last eight years of Schumann's creative life and the works he composed at that time either have been ignored or critiqued under an image of an illness that had caused periodic breakdowns. Schumann's late works show how his culture and the artists communicating within that culture were transformed from the beginning to the middle of the nineteenth century. These late works, therefore, should be viewed in the context of Schumann's output as a whole and in regard to their contributions to nineteenth-century society. Schumann's contributions, specifically to the genre of the song cycle from 1849 to 1852, are among his late compositional works that still await full reconsideration. A topical study, focusing on three themes of selections from his twenty-three late cycles, will provide a critical evaluation of Schumann's compositional output in the genre of the song cycle. First, Schumann's political voice will be examined. The political events that led to the mid-nineteenth-century revolutions inspired crucial …
Date: May 2007
Creator: Ringer, Rebecca Scharlene
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Bioaccumulation of Triclocarban, Triclosan, and Methyl-triclosan in a North Texas Wastewater Treatment Plant Receiving Stream and Effects of Triclosan on Algal Lipid Synthesis. (open access)

Bioaccumulation of Triclocarban, Triclosan, and Methyl-triclosan in a North Texas Wastewater Treatment Plant Receiving Stream and Effects of Triclosan on Algal Lipid Synthesis.

Triclosan (TCS) and triclocarban (TCC), widely used antimicrobial agents found in numerous consumer products, are incompletely removed by wastewater treatment plant (WWTP) processing. Methyl-triclosan (M-TCS) is a more lipophilic metabolite of its parent compound, TCS. The focus of this study was to quantify bioaccumulation factors (BAFs) for TCS, M-TCS, and TCC in Pecan creek, the receiving stream for the City of Denton, Texas WWTP by using field samples mostly composed of the alga Cladophora sp. and the caged snail Helisoma trivolvis as test species. Additionally, TCS effects on E. coli and Arabidopsis have been shown to reduce fatty acid biosynthesis and total lipid content by inhibiting the trans-2 enoyl- ACP reductase. The lipid synthesis pathway effects of TCS on field samples of Cladophora spp. were also investigated in this study by using [2-14C]acetate radiolabeling procedures. Preliminary results indicate high TCS concentrations are toxic to lipid biosynthesis and reduce [2-14C]acetate incorporation into total lipids. These results have led to the concern that chronic exposure of algae in receiving streams to environmentally relevant TCS concentrations might affect their nutrient value. If consumer growth is limited, trophic cascade strength may be affected and serve to limit population growth and reproduction of herbivores in …
Date: August 2007
Creator: Coogan, Melinda Ann
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Blurring the Lines Between Instructor-Led and Online Learning: an Evaluation of an Online Composition Curriculum on the Bleeding Edge (open access)

Blurring the Lines Between Instructor-Led and Online Learning: an Evaluation of an Online Composition Curriculum on the Bleeding Edge

The contemporary classroom currently faces an evolving world of computer based training, online courses, instructor-led learning and several blended approaches in-between. With the increased presence of computers and communication in every facet of students' lives, students have changed to adapt to the continuous presence of technology in their daily lives. These recent rapid developments have changed the relationship between technology and communication. Indeed, communication and technology have become linked to such a degree that it is difficult to differentiate one from the other, thereby altering our rhetorical situation as instructors. Instructors can no longer deny the presence of technology in the contemporary classroom, much less in the contemporary composition classroom. This case study serves as a post-modern analysis of the technology based blended classroom. A gap exists between what online learning is (being) today and what it is (becoming) tomorrow. This dissertation explores the gap by examining two rich data sources: online visitor navigational patterns and instructor interviews. The fundamental ideas that this text explores are the following: - Web server logs and PHP logs can be analyzed to yield relevant information that assists in the design, architecture, and administration of online and blended learning courses. - Technology in the …
Date: August 2007
Creator: Deranger, Brant
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Boston Naming Test with Latencies (BNT-L) (open access)

Boston Naming Test with Latencies (BNT-L)

Although most people have experienced word-finding difficulty at one time or another, there are no clinical instruments able to reliably distinguish normal age-related effects from pathology in word-finding impairment. Two experiments were conducted to establish a modified version of the Boston Naming Test (BNT) that includes latency times, the Boston Naming Test of Latencies (BNT-L), in order to improve the instrument's sensitivity to mild to moderate word-finding impairment. Experiment 1: Latency times on the 60-item BNT (Goodglass et al., 2001) for 235 healthy adults' ages 18-89 years were collected on a representative sample. Qualitative features of the BNT items, statistical analyses, IRT, and demographic considerations of age, gender, education, vocabulary, race and culture, helped create a reduced BNT-L version with 15 of the most discriminating items. Statistically sound and sophisticated normative tables are provided that adjust for unseen covariates. Response latencies did not indicate earlier age-related decline in an optimally healthy sample. Experiment 2: Twenty-three patients referred for neuropsychological testing were administered the BNT-L. Patients referred for evaluation of mild cognitive impairment or possible dementia produced significantly different response BNT-L latencies from the healthy sample whereas patients referred for mild brain injury evaluation did not. Normal word-finding problems were discussed …
Date: May 2007
Creator: Budd, Margaret Anne
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Bulk and Interfacial Effects on Density in Polymer Nanocomposites (open access)

Bulk and Interfacial Effects on Density in Polymer Nanocomposites

The barrier properties of polymers are a significant factor in determining the shelf or device lifetime in polymer packaging. Nanocomposites developed from the dispersion of nanometer thick platelets into a host polymer matrix have shown much promise. The magnitude of the benefit on permeability has been different depending on the polymer investigated or the degree of dispersion of the platelet in the polymer. In this dissertation, the effect of density changes in the bulk and at the polymer-platelet interface on permeability of polymer nanocomposites is investigated. Nanocomposites of nylon, PET, and PEN were processed by extrusion. Montmorillonite layered silicate (MLS) in a range of concentrations from 1 to 5% was blended with all three resins. Dispersion of the MLS in the matrix was investigated by using one or a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Variation in bulk density via crystallization was analyzed using differential scanning calorimetry (DSC) and polarized optical microscopy. Interfacial densification was investigated using force modulation atomic force microscopy (AFM) and ellipsometry. Mechanical properties are reported. Permeability of all films was measured in an in-house built permeability measurement system. The effect of polymer orientation and induced defects on permeability …
Date: May 2007
Creator: Sahu, Laxmi Kumari
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Changes in Social Distance Among American Undergraduate Students Participating in a Study Abroad Program in China (open access)

Changes in Social Distance Among American Undergraduate Students Participating in a Study Abroad Program in China

As the world becomes increasingly interdependent, mutual understanding becomes increasingly important. Therefore, it is essential that people strive for reductions in social distance on an international level. Study abroad is one of the ways to approach internationalization and promote understanding among different peoples and cultures. Prior research has been done on the degrees of social distance between people from different cultures; however, little research has been done regarding changes that cultural immersion produces among those who reside in different cultures. Studies about study abroad programs have focused on cultural sensitivity and adaptability, yet few have combined the study abroad experience with the perceptions of self and other cultural groups. This study presents a framework for understanding people through intercultural activities. It studied social distance and attitude changes brought about in social distance as an artifact of cultural immersion. The study took place both in China and in the United States. It focused on the social distance among American undergraduate students who participated in a China Study Abroad program sponsored by the University of North Texas. The study measured before and after social distance of a group of American students who studied abroad in China. The study abroad program itself was …
Date: December 2007
Creator: Chen, Danxia
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Changes in Trading Volume and Return Volatility Associated with S&P 500 Index Additions and Deletions (open access)

Changes in Trading Volume and Return Volatility Associated with S&P 500 Index Additions and Deletions

When a stock is added into the S&P 500 Index, it is automatically "cross-listed" in the index derivative markets (i.e., S&P 500 Index futures and Index options). I examined the effects of such cross-listing on the trading volume and return volatility of the underlying component stocks. Traditional finance theory asserts that futures and "cash" markets are connected by arbitrage mechanism that brings both markets to equilibrium. When arbitrage opportunities arise, arbitrageurs buy (sell) the index portfolio and take short (long) positions in the corresponding index derivative contracts until prices return to theoretical levels. Such mechanical arbitrage trading tends to create large order flows that could be difficult for the market to absorb, resulting in price changes. Utilizing a list of S&P 500 index composition changes occurring over the period September 1976 to December 2005, I investigated the market-adjusted volume turnover ratios and return variances of the stocks being added to and deleted from the S&P 500, surrounding the effective day of index membership changes. My primary finding is that, after the introduction of the S&P 500 index futures and options contracts, stocks added to the S&P 500 experience significant increase in both trading volume and return volatility. However, deleted stocks …
Date: December 2007
Creator: Lin, Cheng-I Eric
Object Type: Thesis or Dissertation
System: The UNT Digital Library