Experience Talks: Post-Digitization Quality Control Strategies and Tools

This presentation discusses strategies for quality control during the post-digitization phase.
Date: August 5, 2010
Creator: Phillips, Mark Edward
Object Type: Presentation
System: The UNT Digital Library

Infrastructure for the UNT Digital Library

This presentation discusses the University of North Texas Libraries' Digital Projects Unit workflows, how they overcame challenges, and how the use of established models and standards helped them find solutions to the workflow. It presents the editing system created for the Digital Projects Unit, the organizational structure for each object, and identifiers.
Date: August 2, 2010
Creator: Phillips, Mark Edward
Object Type: Presentation
System: The UNT Digital Library
To Date or Not to Date? Religious and Racial Dating Choices Among Conservative Christians (open access)

To Date or Not to Date? Religious and Racial Dating Choices Among Conservative Christians

This study focuses on exploring the reasons behind dating choices concerning religion and race. Studies report that race is more important than religion in choosing dating partners. Understanding religious and racial dating preferences and choices can help uncover group relations in the larger society. The present study examines the reasons why someone may be willing to date a group outside their religion but not a group outside their race. A pre-interview survey questionnaire was used to locate interview participants. The first 20 respondents who met the specific criteria of being White, single, and a conservative Christian were selected for a qualitative phone interview. To qualify, the respondents needed to be willing to date at least one group that was not Christian, but unwilling to date certain groups outside their race. The interviews were transcribed and the content was analyzed for patterns and themes using the Grounded theory. The results revealed that all the respondents except one were unwilling to date a Black individual and five were unwilling to date any race but White. The least likely to be considered as dating partners for religious groups were the Muslims and atheists. For race, many of the participants viewed Hispanics and Asians …
Date: August 2010
Creator: Stillwell, Lorinda Clare
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Determining the Relation Between the Moments of Acquisition of Baseline Conditional Discriminations and the Emergence of Equivalence Relations (open access)

Determining the Relation Between the Moments of Acquisition of Baseline Conditional Discriminations and the Emergence of Equivalence Relations

The experiment was an attempt to gain a more precise understanding of the temporal relation between the development of analytic units and equivalence relations. Two prompting procedures were used during training to pinpoint when eight subjects learned the conditional discriminations. Near simultaneous presentation of probe and training trials allowed for examination of the temporal relation between conditional discrimination acquisition and derived performances on stimulus equivalence probes. The data show that, for seven of eight subjects, a decreased reliance on prompts was coincident with the development of equivalence-consistent choices on either all or some probe trials, which suggests that the development of analytic units is sufficient to give rise to equivalence relations among stimuli.
Date: August 2010
Creator: Swisher, Melissa J.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Antonín Dvořák’s Piano Concerto in G Minor, Opus 33: A Discussion of Musical Intent and Pianistic Effectiveness in Vilém Kurz's Version of the Solo Piano Part (open access)

Antonín Dvořák’s Piano Concerto in G Minor, Opus 33: A Discussion of Musical Intent and Pianistic Effectiveness in Vilém Kurz's Version of the Solo Piano Part

Since its premiere in 1878, Antonín Dvořák’s Piano Concerto in G Minor has been underrated and held in low regard by musicologists, critics, performers and audiences alike. Vilém Kurz (1872-1945), a Czech pianist and pedagogue, revised and reworked the piano solo part to incorporate what he considered to be added brilliance and pianistic effectiveness. However, the revised version has not increased the popularity of the work. In recent decades, this concerto has begun to appear more often in the programs and recordings are currently available, utilizing either the original piano part or Kurz's revision or a combination of both. In order to gain a broader analytical perspective and achieve a more authentic interpretation of the piece, a thorough understanding of the relation between Dvořák’s work and Kurz's revisions is indispensable. This study examines these adaptations and compares them with Dvořák’s scoring in order to gain further insight to Kurz's musical intent and pianistic aims. Examples from all movements are evaluated vis-à-vis the original to determine their purpose and musical validity.
Date: August 2010
Creator: Tang, Wen-Chien
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Is Mattering what Matters: A Validation Study of the Meta-Valuing Measure of Flexible Valuing (open access)

Is Mattering what Matters: A Validation Study of the Meta-Valuing Measure of Flexible Valuing

Freely choosing a life direction, or flexible valuing, is a core component of acceptance and commitment therapy (ACT). Initial research suggests that valuing behavior may contribute to psychological well-being, but has been stymied by a lack of an efficient measure. The current study examined the psychometric characteristics of a new measure of flexible valuing, the Meta-Valuing Measure (MVM), in a sample of 532 undergraduates. Exploratory factors analysis revealed 3 orthogonal factors, Valuing (α = .94), Freedom from Values Conflict (α = .92), and Flexibility in Valuing (α = .73). The majority of expected relationships with other constructs were significant including those with measures of values, mindfulness, quality of life, experiential avoidance, and psychological distress.
Date: August 2010
Creator: Taravella, Cicely C.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Relationship between Physical Activity and Sleep (open access)

The Relationship between Physical Activity and Sleep

The current study aimed to examine the naturalistic relationship between physical activity and sleep by exploring frequency, type, and timing of exercise and their association with a variety of sleep variables (e.g., sleep onset latency, wake after sleep onset, sleep efficiency). Young adults (n = 1003) completed a variety of self-report questionnaires, including a week-long sleep diary and a survey of typical frequency, type, and timing of exercise completed in the past week. Increased frequency of physical activity was related to increased sleep efficiency (total sleep time/time in bed), decreased time in bed, and decreased time spent awake in bed in the morning. Greater amounts of exercise energy expenditure (i.e., metabolic equivalents) per week was related to increased sleep efficiency, and decreased time in bed and time spent awake in bed in the morning. After controlling for other factors, this relationship remained true only for time spent awake in bed in the morning. Early morning exercisers reported shorter total sleep time and time in bed than those who typically exercised at other times. No exercise differences were found between those who met the research diagnostic criteria for insomnia and those who did not. This study provides valuable information to help …
Date: August 2010
Creator: Tatum, JoLyn Inez
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Changing Role and Responsibilities of Audit Committees in the United States (open access)

The Changing Role and Responsibilities of Audit Committees in the United States

The corporate form that developed in the early 20th century created enormous pressure for corporate governance mechanisms to curb the power of corporate managers. Berle and Means, legal pluralists, warned about concentrating economic power in the hands of a small but powerful class of professional managers. They claimed this "new form of absolutism" required governmental oversight and viewed boards of directors as part of management, rather than monitors for shareholders. The Securities and Exchange Commission (SEC) proposed that corporations establish a special board committee, made up of "nonofficer members" in response to the McKesson & Robbins scandal of the late 1930s. My dissertation examines the evolution of the U.S. corporate audit committee through three specific time periods: (1) 1920-1954; (2) 1955-1986; and (3) 1987 to the passage of the Sarbanes-Oxley Act of 2002. My purpose is to determine if evolution of the audit committee throughout these periods has been a reform continually couched in symbolism or whether the audit committee concept has evolved into real reform, allowing proper corporate governance and mitigation of unchecked corporate power. My analysis is a traditional empirical analysis, relying on both primary and secondary sources to develop a coherent ordering of facts. I use narrative …
Date: August 2010
Creator: Teed, Dan Graham
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Affordances of Instrumentation in General Chemistry Laboratories (open access)

Affordances of Instrumentation in General Chemistry Laboratories

The purpose of this study is to find out what students in the first chemistry course at the undergraduate level (general chemistry for science majors) know about the affordances of instrumentation used in the general chemistry laboratory and how their knowledge develops over time. Overall, students see the PASCO™ system as a useful and accurate measuring tool for general chemistry labs. They see the probeware as easy to use, portable, and able to interact with computers. Students find that the PASCO™ probeware system is useful in their general chemistry labs, more advanced chemistry labs, and in other science classes, and can be used in a variety of labs done in general chemistry. Students learn the affordances of the probeware through the lab manual, the laboratory teaching assistant, by trial and error, and from each other. The use of probeware systems provides lab instructors the opportunity to focus on the concepts illustrated by experiments and the opportunity to spend time discussing the results. In order to teach effectively, the instructor must know the correct name of the components involved, how to assemble and disassemble it correctly, how to troubleshoot the software, and must be able to replace broken or missing components …
Date: August 2010
Creator: Sherman, Kristin Mary Daniels
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Literature in the Age of Science: Technology and Scientists in the Mid-Twentieth Century Works of Isaac Asimov, John Barth, Arthur C. Clarke, Thomas Pynchon, and Kurt Vonnegut (open access)

Literature in the Age of Science: Technology and Scientists in the Mid-Twentieth Century Works of Isaac Asimov, John Barth, Arthur C. Clarke, Thomas Pynchon, and Kurt Vonnegut

This study explores the depictions of technology and scientists in the literature of five writers during the 1960s. Scientists and technology associated with nuclear, computer, and space science are examined, focusing on their respective treatments by the following writers: John Barth, Kurt Vonnegut, Thomas Pynchon, Isaac Asimov, and Arthur C. Clarke. Despite the close connections between the abovementioned sciences, space science is largely spared from negative critiques during the sixties. Through an analysis of Barth's Giles Goat-boy, Vonnegut's Cat's Cradle, Pynchon's The Crying of Lot 49, Asimov's short stories "Key Item," "The Last Question," "The Machine That Won the War," "My Son, the Physicist," and Clarke's 2001: A Space Odyssey, it is argued that altruistic goals of space science during the 1960s protect it from the satirical treatments that surround the other sciences.
Date: August 2010
Creator: Simes, Peter A.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Optimism, Delay Discounting, and Physical Exercise: The Role of Delay Discounting on Individual Levels of Exercise (open access)

Optimism, Delay Discounting, and Physical Exercise: The Role of Delay Discounting on Individual Levels of Exercise

Deciding to exercise requires trade-offs between immediate and delayed benefits. These momentary decisions may be moderated by personality such that patterns of individual behavior emerge. The aim of the current study was to determine if higher levels of optimism and lower levels of delay discounting were related to exercise frequency. A sample of 360 undergraduate students completed a survey study related to understanding the choices made by undergraduates and how other factors relate to their decision-making. The survey included measures of optimism, delayed discounting, and self-reported exercise frequency in four domains: cardiovascular, resistance, sports, active lifestyle. Hierarchical linear regression was used to examine optimism and delay discounting as predictors of exercise frequency. Optimism and delay discounting were negatively correlated, but neither was related to exercise frequency. Furthermore, optimism and delay discounting were not significantly related to frequency spent in cardiovascular, resistance, or active lifestyle exercise. However, women scoring higher in delay discounting were more likely to participate in physical sports. The present study helps inform future research by showing potentially important psychosocial variables related to optimism, delay discounting, and exercise.
Date: August 2010
Creator: Smith, Lauren Marie
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Rebecca Clarke: A Viola Duo Transcription of the Prelude, Allegro, and Pastorale (open access)

Rebecca Clarke: A Viola Duo Transcription of the Prelude, Allegro, and Pastorale

Throughout centuries of great classical music, many viola compositions have been crafted from a wealth of literature for instruments of similar range. Clarinet, violin, and cello concerti and ensemble literature often adapt into challenging literature for the viola. In November 2009, Oxford Music Publishing gave me permission to transcribe and perform the Prelude, Allegro, and Pastorale by Rebecca Clarke in New York's famed Carnegie Hall - Weill Recital Hall. This dissertation explains the process by which I transcribed the Prelude, Allegro, and Pastorale from an original Bb-clarinet/viola duo, to a new arrangement for two violas (approved by Oxford Music Press arrangement license #7007940), and discusses challenges faced throughout the transcription process.
Date: August 2010
Creator: Stevens, Daniel Brent
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Evolution, Not Revolution: The Effect of New Deal Legislation on Industrial Growth and Union Development in Dallas, Texas (open access)

Evolution, Not Revolution: The Effect of New Deal Legislation on Industrial Growth and Union Development in Dallas, Texas

The New Deal legislation of the 1930s would threaten Dallas' peaceful industrial appearance. In fact, New Deal programs and legislation did have an effect on the city, albeit an unbalanced mixture of positive and negative outcomes characterized by frustrated workers and industrial intimidation. To summarize, the New Deal did not bring a revolution, but it did continue an evolutionary change for reform. This dissertation investigated several issues pertaining to the development of the textile industry, cement industry, and the Ford automobile factory in Dallas and its labor history before, during, and after the New Deal. New Deal legislation not only created an avenue for industrial workers to achieve better representation but also improved their working conditions. Specifically focusing on the textile, cement, and automobile industries illustrates that the development of union representation is a spectrum, with one end being the passive but successful cement industry experience and the other end being the automobile industry union efforts, which were characterized by violence and intimidation. These case studies illustrate the changing relationship between Dallas labor and the federal government as well as their local management. Challenges to the open shop movement in Dallas occurred before the creation of the New Deal, but …
Date: August 2010
Creator: Welch, M. Courtney
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Mixed-Methods Approach to the Experiences of Non-Offending Parents of Children who have Experienced Sexual Abuse Participating in Child Parent Relationship Therapy (CPRT) (open access)

A Mixed-Methods Approach to the Experiences of Non-Offending Parents of Children who have Experienced Sexual Abuse Participating in Child Parent Relationship Therapy (CPRT)

When a child has been sexually abused, the non-offending parent and child may benefit from an intervention aimed at enhancing the parent child relationship. This mixed-methods study examined the process of child parent relationship therapy (CPRT) with non-offending parents of children who had been sexually abused. One purpose of the present study was to examine change in parent-child relationship, child behavior, and parent empathy of non-offending parents whose children have been sexually abused after participation in CPRT. A secondary purpose of this study was to explore subjective experiences of non-offending parents who participate in CPRT. Participants (N = 8) completed 11 weeks of CPRT in either Spanish speaking (n = 4) or English speaking (n = 4) groups. All participants completed pretest and posttest instruments including Child Behavior Checklist, Parenting Stress Index, and Measurement of Empathy in Adult-Child Interaction. Pretest and posttest means were reported but because of small sample size, only descriptive statistics are reported. Possible trends in pretest/posttest mean scores of the quantitative instruments are discussed. All participants also completed a post semi-structured interview to account for the experience of participants qualitatively. Analysis of the qualitative data revealed enhanced parent-child relationships, improved communication, greater acceptance, positive parental internal …
Date: August 2010
Creator: West, Brooke E.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Impact of Training on the Frequency of Internal Promotions of Employees and Managers (open access)

The Impact of Training on the Frequency of Internal Promotions of Employees and Managers

In this study, the relationship between formal training opportunities and internal promotions in organizations was examined in order to support the value of organizations investing in employees through training opportunities, as training is often seen as an expense to be cut in difficult times. Differences between general and specific training topics on the impact of frequency of promotion in an organization were addressed, as well as assessing differences between employees and managers. Training allows for a more capable workforce and pool of employees to pull from when an organization needs to hire. Hiring from within can save time, money, and allow for a proven person-organization fit that hiring from the external workforce cannot provide. The archival data used in the study were from the National Organizations Survey, 1996-1997 which included organizations of all sizes and forms. The analyses produced mixed support for the hypotheses. Significant relationships were found between hours of formal training and frequency of promotions of employees, and between importance of training in promotions and frequency of promotions for managers. Multiple regressions revealed that the hypothesis predicting that increased hours of training focused on general skills would positively contribute to promotion rates was not supported for either employees …
Date: August 2010
Creator: West, Lindsey Straka
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Utility of the Spatial Span from the Wechsler Memory Scales in a Geriatric Population with Cognitive Impairments (open access)

The Utility of the Spatial Span from the Wechsler Memory Scales in a Geriatric Population with Cognitive Impairments

Performance on the Spatial Span subtest of the Wechsler Memory Scale has been viewed as an indicator of working memory and visuospatial processing. A number of factors including age and gender have been posited to effect performance on Spatial Span by older adults. The current study examined the impact of various forms of cognitive impairment and severity of impairment on Spatial Span performance. Five hundred thirty-eight individuals between the ages of 65 and 89 were evaluated in a university memory disorders clinic using a battery of neuropsychological tests that included Spatial Span. Participants were grouped by consensus diagnosis into type of cognitive impairment (Alzheimer's disease, vascular disease, amnestic mild cognitive impairment or non-amnestic mild cognitive impairment) or cognitively normal. As expected, an increase in severity of impairment results in a decrease in Spatial Span Total Score. Other findings included a weak relationship between age and Spatial Span Total Score. Gender, as well as age, did not fully account for the decline in Spatial Span Total Score. Spatial Span Forward score was not as good a predictor of severity in that reduction in score for Spatial Span Forward remains relatively stable regardless of level of impairment. Spatial Span Backward performance was …
Date: August 2010
Creator: Wiechmann, April
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Attenuation of the Squared Canonical Correlation Coefficient Under Varying Estimates of Score Reliability (open access)

Attenuation of the Squared Canonical Correlation Coefficient Under Varying Estimates of Score Reliability

Research pertaining to the distortion of the squared canonical correlation coefficient has traditionally been limited to the effects of sampling error and associated correction formulas. The purpose of this study was to compare the degree of attenuation of the squared canonical correlation coefficient under varying conditions of score reliability. Monte Carlo simulation methodology was used to fulfill the purpose of this study. Initially, data populations with various manipulated conditions were generated (N = 100,000). Subsequently, 500 random samples were drawn with replacement from each population, and data was subjected to canonical correlation analyses. The canonical correlation results were then analyzed using descriptive statistics and an ANOVA design to determine under which condition(s) the squared canonical correlation coefficient was most attenuated when compared to population Rc2 values. This information was analyzed and used to determine what effect, if any, the different conditions considered in this study had on Rc2. The results from this Monte Carlo investigation clearly illustrated the importance of score reliability when interpreting study results. As evidenced by the outcomes presented, the more measurement error (lower reliability) present in the variables included in an analysis, the more attenuation experienced by the effect size(s) produced in the analysis, in this …
Date: August 2010
Creator: Wilson, Celia M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An Investigation of the Perceptions of Christian Seminary Counseling Students Regarding Play Therapy (open access)

An Investigation of the Perceptions of Christian Seminary Counseling Students Regarding Play Therapy

The threefold purpose of this study was to assess the extent to which counseling seminary students' beliefs corresponded to the tenets of child-centered play therapy, the amount of training seminary counseling students received in the area of child counseling and play therapy, and the applicability of child-centered play therapy courses in seminary counselor education programs. The researcher pursued this purpose through administration of a survey instrument she developed. The instrument consisted of 22 demographic items and 23 5-point Likert scale items based on the tenets of child-centered play therapy. The sample was comprised of 206 seminary counseling students from 12 Christian seminaries across the United States: 155 female and 51 male participants ranging in age from 21 to 60 years old and including 5.3% African American, 3.9% Asian, 1.5% Biracial/Multiracial, 3.4% Hispanic, 83% White (Non-Hispanic), 2.4% Other. Multiple regression analysis was utilized to determine which demographic variables were significant predictors of respondents' beliefs regarding child-centered play therapy. Results indicated significance at p < .05 level. Specifically, respondents who reported feeling more prepared to counsel children reported beliefs more congruent with child-centered play therapy, and respondents from the Southwestern and Southeastern portions of the United States exhibited beliefs less congruent with …
Date: August 2010
Creator: Thacker, Andi
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Role of N-Acylethanolamines in Plant Defense Responses: Modulation by Pathogens and Commercial Antimicrobial Stressors (open access)

Role of N-Acylethanolamines in Plant Defense Responses: Modulation by Pathogens and Commercial Antimicrobial Stressors

N-acyl ethanolamines (NAEs) are a class of lipids recently recognized as signaling molecules which are controlled, in part, by their degradation by fatty acid amide hydrolase (FAAH). On the basis of previous studies indicating increased NAE levels in a tobacco cell suspension-xylanase elicitor exposure system and the availability of FAAH mutants, overexpressor and knockout (OE and KO) genotypes in Arabidopsis thaliana, further roles of NAEs in A. thaliana plant defense was investigated. The commonly occurring urban antimicrobial contaminant triclosan (TCS) has been shown to suppress lipid signaling associated with plant defense responses. Thus, a second objective of this study was to determine if TCS exposure specifically interferes with NAE levels. No changes in steady state NAE profiles in A. thaliana-Pseudomonas syringae pv. syringae and A. thaliana-flagellin (bacterial peptide, flg22) challenge systems were seen despite evidence that defense responses were activated in these systems. There was a significant drop in enoyl-ACP reductase (ENR) enzyme activity, which catalyzes the last step in the fatty acid biosynthesis pathway in plants, on exposure of the seedlings to TCS at 10 ppm for 24 h and decreased reactive oxygen species (ROS) production due to flg22 in long term exposure of 0.1 ppm and short term …
Date: August 2010
Creator: Vadapalli, Vatsala
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Aesthetic and Technical Analysis on Soar! (open access)

Aesthetic and Technical Analysis on Soar!

Soar! is a musical composition written for wind ensemble and computer music. The total duration of the work is approximately 10 minutes. Flocking behavior of migratory birds serves as the most prominent influence on the imagery and local structure of the composition. The cyclical nature of the birds' journey inspires palindromic designs in the temporal domain. Aesthetically, Soar! portrays the fluid shapes of the flocks with numerous grains in the sounds. This effect is achieved by giving individual parts high degree of independence, especially in regards to rhythm. Technically, Soar! explores various interactions among instrumental lines in a wind ensemble, constructs overarching symmetrical structures, and integrates a large ensemble with computer music. The conductor acts as the leader at several improvisational moments in Soar! The use of conductor-initiated musical events in the piece can be traced back through the historic lineage of aleatoric compositions since the middle of the twentieth century. [Score is on p. 54-92.]
Date: August 2010
Creator: Wang, Hsiao-Lan
Object Type: Thesis or Dissertation
System: The UNT Digital Library
DNA Degradation as an Indicator of Post-Mortem Interval (open access)

DNA Degradation as an Indicator of Post-Mortem Interval

The question of post-mortem interval (PMI) or time since death is often the most sought after piece of information associated with a medical death investigation. Based on the observation that DNA degradation disproportionately affects the analysis of larger genetic loci, it was proposed that DNA degradation, as a result of autolysis or putrefaction, could prove suitable as a potential rate-of-change indicator of PMI. Nine randomly amplified polymorphic DNA (RAPD) analysis primers and three sets of directed amplification primers were evaluated to determine their suitability for use in assessing the degree of DNA fragmentation in tissue samples. They were assessed for amplicon specificity, total DNA target sensitivity, allele monomorphism and the observance of degradation-based profile changes. Markers meeting the requisite criteria were then used to assess a range samples degraded under controlled and uncontrolled conditions. Tissue samples collected from seven domestic pigs (Sus scrofa) were incubated under controlled laboratory or uncontrolled field conditions to produce samples simulating those potentially collected in a forensic case. DNA samples isolated from these specimens were then analyzed at those loci which had been determined to meet the requisite criteria. Collectively, data generated from these analyses indicate that genetic profiles generated by this approach can provide …
Date: August 2010
Creator: Watson, William H.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Middle School Students in Virtual Learning Environments (open access)

Middle School Students in Virtual Learning Environments

This ethnographic study examined middle school students engaged in a virtual learning environment used in concert with face-to-face instruction in order to complete a collaborative research project. Thirty-eight students from three eighth grade classes participated in this study where data were collected through observation of student work within the virtual learning environment, an online survey, and focus group sessions with students involved in the project. Results indicated students found the virtual learning environment to be valuable as a platform to complete a collaborative research assignment because of portability, ease of use, and organization. Embedded resources within the environment were helpful because of the convenience. Other people, including peers and teachers, were the preferred source of help when problems navigating the environment or finding information arose. Students communicated within the virtual learning environment as a social outlet, a way to check in, and a means to offer content related comments. Ideally the study's findings will give insight into student experiences in a virtual learning environment in order to help educators design more effective learning experiences and incorporate useful supports within such environments.
Date: August 2010
Creator: Wyatt, Erin Drankwalter
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Cold-Formed Steel Bolted Connections Using Oversized and Slotted Holes without Washers (open access)

Cold-Formed Steel Bolted Connections Using Oversized and Slotted Holes without Washers

In cold-formed steel (CFS) construction, bolted connections without washers for either oversized or slotted holes may significantly expedite the installation process and lower the cost. However, the North American Specification (AISI S100, 2007) for the Design of Cold-Formed Steel Structural Members requires washers to be installed in bolted connections with oversized or slotted holes. A research project (Phase 1) sponsored by American Iron and Steel Institute (AISI) was recently completed at the University of North Texas (UNT) that investigated the performance and strength of bolted CFS connections with oversized and slotted holes without using washers. The research presented in this thesis is the Phase 2 project in which the bolted CFS connections were studied in a broader respect in terms of the failure mechanism, the material thickness, and the hole configurations. Single shear and double shear connections without washers using oversized holes, oversized combined with standard or slotted holes were experimentally examined. Combined with Phase 1 results, the Phase 2 gives a comprehensive evaluation of the behavior and strength of bolted CFS connections with oversized and slotted holes without using washers. Revisions to the existing AISI North American Specification requirements for bolted connections are proposed to account for the reduction …
Date: August 2010
Creator: Xu, Ke
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Ecological Sustainability and Peace: The Effect of Ecological Sustainability on Interstate and Intrastate Environmental Conflict (open access)

Ecological Sustainability and Peace: The Effect of Ecological Sustainability on Interstate and Intrastate Environmental Conflict

This study examines the relationship between ecological sustainability and violent conflict at both the interstate and intrastate level. In particular, this study explores the effect of ecological sustainability of a society on the initiation and the occurrence of violent conflict. By developing a theory, which is named "Eco-peace," this study hypothesizes that the more ecologically sustainable the socioeconomic system of societies, the less likely the society is to initiate interstate conflict. Regarding intrastate conflict, it is hypothesized that the more ecologically sustainable the mode of development pursued by the Third World society is, the more likely that society is to experience intrastate conflicts. To test the hypotheses, this study conducts cross-national time-series analyses for 97-127 countries. Negative binomial and Poisson models are used for interstate conflict during 1960-2001, and logit and rare event logit models are used for intrastate conflict during 1960-1999. Militarized interstate dispute dataset and Uppsala Armed Conflict Program dataset are employed for interstate and intrastate conflict. For ecological sustainability, Ecological sustainability factor index and Environmental sustainability index are used. Through the analyses, this study found the supports for the theoretical argument that the ecologically unsustainable modes of development cause the initiation of interstate conflict and the incidence …
Date: August 2010
Creator: Yoon, Jong-Han
Object Type: Thesis or Dissertation
System: The UNT Digital Library