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1,811 Matching Results
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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
A Collaborative Affair: The Building of Museum and School Partnerships
This study examined two art museum and school partnerships in order to learn how partnerships enable an integration of goals, participants' beliefs and values, and learning objectives. This study examined the partnerships through a social constructivist lens and used narrative analysis as way to interpret participants' stories about collaboration. The research found three major themes among participants' stories. Participants: a) valued good communication to establish relationships between partners, b) believed partnership offered students experiences that educated the whole person, and c) felt that students making meaning by interacting in the museum environment was an indicator of success. The study closes with discussion of the researchers' own constructions as they developed throughout the study.
Date:
August 2010
Creator:
Yount, Katherine
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Collaborative Digital Repository Opportunities
This presentation discusses collaborative digital repository opportunities. The presentation offers questions and considerations as well as managing digital collections.
Date:
October 11, 2010
Creator:
Phillips, Mark Edward
Object Type:
Presentation
System:
The UNT Digital Library
College Student Resilience: Selected Effects of Service-Learning
Resilience implies the concept of buoyancy. Specifically, it denotes an individual's capacity to persevere and even do well in the face of adversity. Service-learning is pedagogy often used to enable students to apply classroom learning in a real world context. The goal of this study was to examine the effects of service-learning upon college student resilience. The study utilized a convenience sample of undergraduate students (N = 172) across three disciplines including counseling, social work and kinesiology. In a pre-post test design, the CD-RISC was employed to measure resilience of the experimental and control groups. Factor analysis of the CD-RISC was also conducted in order to explore interrelationship of the variables among the data. One undergraduate sample (N = 210) was used to conduct the EFA before determining a best fit factor structure for this study's population. A repeated measures analysis of variance was employed to detect any differences between pre-post test groups. No statistical significance was found across pre and post-test among the two groups (p=.49, η2=.00). However significant results were found between the experimental and control groups (p=.00, η2 =.09). Examination of mean score differences among demographic variable yielded interesting findings across the three disciplines as well as …
Date:
August 2010
Creator:
Mercer, J. Carol
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
College Success for all Students: An Investigation of Early Warning Indicators of College Readiness
The purpose of this quantitative study was to determine early warning indicators of college readiness among early college high school students at selected Texas institutions of higher education. Participants in this study included 134 of the class of 2010 from two early college high schools. The graduates were 86% Hispanic, 8% African American, 3% White, 2% Asian, 1% American Indian and 72% economically disadvantaged. A causal-comparative research design using multiple regression analysis of the data collected revealed that each one unit increase in world history was associated with a .470 (p < .05) increase in college GPA, while each one unit increase in Algebra I was associated with a .202 (p < .05) increase. Therefore, student grades in high school Algebra I and world history were the strongest statistically significant indicators that a student will maintain a 2.5 college GPA during the first year of college. According to the early warning indicators, students who maintain a grade of A or B in Algebra I are 10 times more likely to be college ready while having a 78% chance of maintaining a 2.5 or better in college courses. Further, the findings from this study found no significant relationship between TAKS assessment, …
Date:
December 2010
Creator:
Davis, Denise
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Combining of Korean Traditional Performance and Recent German Techniques in Isang Yun's Kontraste: Zwei Stücke für Violine Solo (1987)
Isang Yun (1917-1995) embraced a masterful combination of two elements derived from his life: his Korean cultural upbringing and Western musical traditions. This dissertation explores Yun's distinctive style through an analysis of his Kontraste: Zwei Stücke für Violine Solo. Following the introduction (Chapter 1), Chapter 2 contains a brief biography of Isang Yun, and explores the compositions of his Korean period (1917-1955) and his European period (1956-1995). It also discusses how Yun's musical styles changed during these two periods as a result of important life events and due to cultural and political influences. Chapter 3 examines Korean instruments such as Kayakem, Hae-Kem, and Pak; discusses Nonghyun (traditional string techniques of ornamentation in Korean music); and introduces Korean performance techniques. This chapter also provides explanations of these concepts, illustrated through various examples. A subsequent discussion illuminates Yin-Yang theory and Jeong-Jung-Dong, both elements of Taoist philosophy that influenced Yun's compositional style. This is followed by explanations of Hauptton and Umspielung, two compositional techniques that Yun developed and employed in Kontraste. Yun created the idea of Hauptton to reflect the Korean traditional concept of a single note. He used the term Umspielung ("playing around" in German) to describe his interpretation of the four …
Date:
December 2010
Creator:
Kim, Hyo Jung
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
[Commencement Ceremony Speaker]
Photograph of a male speaker at the masters commencement ceremony for the University of North Texas, in Denton, Texas. The speaker is dressed in green and black graduation regalia. There are people seated in the background, watching the speaker.
Date:
May 14, 2010
Creator:
Chaney, Ken
Object Type:
Photograph
System:
The Portal to Texas History
[Commencement Ceremony Speaker]
Photograph of a woman speaking at the masters commencement ceremony at the University of North Texas, in Denton, Texas. The woman is standing at a podium and wearing blue, black and gold graduation regalia. There are people seated in the background, listening to the speaker and watching the ceremony.
Date:
May 14, 2010
Creator:
Chaney, Ken
Object Type:
Photograph
System:
The Portal to Texas History
[Commencement Ceremony Speaker]
Photograph of a woman speaking at the masters commencement ceremony at the University of North Texas, in Denton, Texas. The woman is standing at a podium and wearing a black dress. There are students seated in the background, listening to the speaker. The photo was taken from behind the podium.
Date:
May 14, 2010
Creator:
Chaney, Ken
Object Type:
Photograph
System:
The Portal to Texas History
Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions: Analysis of options to move beyond 20% greenhouse gas emission reductions and assessing the risk of carbon leakage
Since the EU took its historic decisions on combating climate change in 2008, the economic crisis has brought some fundamental changes to the political and economic landscape of the EU's climate policy. The pressure on the EU economy is intense. The EU, however, remains deeply committed to action on climate change. Arresting the rise in global temperature remains one of the biggest challenges facing this generation. This Communication has set out how changed global circumstances have impacted on the targets set in 2008. While the absolute costs of meeting a 20% target have been reduced, representing a welcome relief for businesses facing the uphill battle of recovery, it also represents a risk that the effectiveness of the 20% target as a motor for change diminishes.
Date:
2010
Creator:
European Commission
Object Type:
Text
System:
The UNT Digital Library
The Community Water Initiative Fostering Water Security and Climate Change Mitigation and Adaptation
This publication highlights some case studies that illustrate successful projects funded by the Community Water Initiative (CWI), which have helped foster water security in local communities while simultaneously helping them mitigate and adapt to climate change through: (i) Community-based water supply and sanitation services using low-cost systems manageable by communities; (ii) Water resource conservation and sustainable land management to create resilient systems to combat drought and floods; (iii) Providing clean energy for water pumping; and (iv) Capacity building for community-level governance through community water management committees, women’s empowerment, and the establishment of water user fee schemes.
Date:
2010
Creator:
GEF‐SGP National Coordinators
Object Type:
Text
System:
The UNT Digital Library
A Comparative Analysis of the 1915 and 1919 Versions of Symphony No. 5 in E-flat Major, op. 82 by Jean Sibelius
The initial composition of the Fifth Symphony in E-flat Major, Op. 82 was undertaken as a commission to celebrate the composer's fiftieth birthday. Unhappy with the initial efforts, two revisions were then performed; the first was in 1916 and the final revision in 1919. Despite the larger form of the work seeming to have been changed between the 1915 and 1919 versions, the smaller gestures of thematic expression in both versions remained similar. On the surface, it had appeared that the composer had eliminated a movement, changing the 1919 version into a three movement form. This view was not challenged by the composer at the time, and since the earlier versions had either been withdrawn or destroyed, there was no way to compare the original efforts to the final product until recently. In comparing the 1919 version to the original, a definite strong parallel can be seen between the two - despite the changes to form, rearrangement of melodic material, and the seemingly different number of movements. However, the parallel is enough that the 1915 version can be a guide to classifying the 1919 version, an act that has eluded many scholars since the 1920s. Most importantly, comparing the two …
Date:
May 2010
Creator:
Norine, John Richard, Jr.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Comparing Indices of Happiness during Teaching Interactions
The measurement of happiness has received increasing attention in behavior analytic literature. Happiness in individuals with developmental disabilities has been assessed by 1) counting a specific behavior, or 2) sampling constellations of behaviors. The purpose of this study was to examine the two approaches while observing nine child and teacher dyads at an autism treatment center. Results showed that, overall, a constellation of behaviors can yield similar patterns when compared to a specific behavior count. However, the affect of one person did not predict the affect of the other and similar instructional conditions did not predict affect either. The implications of these results and future directions are discussed.
Date:
May 2010
Creator:
Anderson, Claire Therese
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Comparing the Effects of Home Versus Clinic-Based Parent Training for Children with Autism
Research with parents on managing child problem behavior typically measures either child or parent behavior. This study was designed to evaluate the effectiveness of training parents to implement a function-based behavior intervention plan (BIP) in a non-trained natural environment utilizing a Multiple Probe Design across Participants. Participants included four parent-child dyads. Measurement variables included parents' use of effective and ineffective strategies and child problem behavior. Intervention involved training parents to understand and implement the BIP using effective strategies, modeling the effective procedures, and providing feedback following parent implementation of procedures. Results showed that the intervention was very effective in promoting skill generalization of parents and decreasing child problem behavior. The findings have implications for research and clinical practice.
Date:
May 2010
Creator:
Crone, Regina M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Comparing the Readability of Text Displays on Paper, E-Book Readers, and Small Screen Devices
Science fiction has long promised the digitalization of books. Characters in films and television routinely check their palm-sized (or smaller) electronic displays for fast-scrolling information. However, this very technology, increasingly prevalent in today's world, has not been embraced universally. While the convenience of pocket-sized information pieces has the techno-savvy entranced, the general public still greets the advent of the e-book with a curious reluctance. This lack of enthusiasm seems strange in the face of the many advantages offered by the new medium - vastly superior storage capacity, searchability, portability, lower cost, and instantaneous access. This dissertation addresses the need for research examining the reading comprehension and the role emotional response plays in the perceived performance on e-document formats as compared to traditional paper format. This study compares the relative reading comprehension on three formats (Kindle, iTouch, and paper) and examines the relationship of subject's emotional response and relative technology exposure as factors that affect how the subject perceives they have performed on those formats. This study demonstrates that, for basic reading comprehension, the medium does not matter. Furthermore, it shows that, the more uncomfortable a person is with technology and expertise in the requested task (in this case, reading), the …
Date:
May 2010
Creator:
Baker, Rebecca Dawn
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Comparison of Heteranthera Dubia (Jacq.) MacM.-associated Macroinvertebrates Between Georgraphical Regions in the United States
Macroinvertebrates associated with the aquatic plant, water stargrass (Heteranthera dubia), were sampled from 12 waterbodies in four regions of the United States from June to August 2005. Taxa richness, evenness, and diversity were lowest in the Lower Midwest (LMW) region, and higher in Northern sites, especially the Upper Midwest (UMW), and Northeast (NE). While relative abundance varied from site to site and region to region, utilization of the plant by functional groups remained fairly constant. Collector-gatherers consistently comprised the largest portion of invertebrates sampled. The shredder/ herbivore functional group comprised an average of 17 % of total groups. Through an exhaustive literature review, it was found that shredder/ herbivores of water stargrass have not been reported in the literature. Because of this, the herbivore group was analyzed separately and consisted of 2,383 specimens representing 23 species. The most common groups were Rhopalosiphum sp., Nectopsyche spp. and chironomids. No differences were found in herbivore diversity or evenness between sampling regions, but species richness was significantly different.
Date:
May 2010
Creator:
Harms, Nathan Earl
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Computational Study of Small Molecule Activation via Low-Coordinate Late First-Row Transition Metal Complexes
Methane and dinitrogen are abundant precursors to numerous valuable chemicals such as methanol and ammonia, respectively. However, given the robustness of these substrates, catalytically circumventing the high temperatures and pressures required for such transformations has been a challenging task for chemists. In this work, computational studies of various transition metal catalysts for methane C-H activation and N2 activation have been carried out. For methane C-H activation, catalysts of the form LnM=E are studied, where Ln is the supporting ligand (dihydrophosphinoethane or β-diketiminate), E the activating ligand (O, NCH3, NCF3) at which C-H activation takes place, and M the late transition metal (Fe,Co,Ni,Cu). A hydrogen atom abstraction (HAA) / radical rebound (RR) mechanism is assumed for methane functionalization (CH4 à CH3EH). Since the best energetics are found for (β-diket)Ni=O and (β-diket)Cu=O catalysts, with or without CF3 substituents around the supporting ligand periphery, complete methane-to-methanol cycles were studied for such systems, for which N2O was used as oxygen atom transfer (OAT) reagent. Both monometallic and bimetallic OAT pathways are addressed. Monometallic Fe-N2 complexes of various supporting ligands (LnFe-N2) are studied at the beginning of the N2 activation chapter, where the effect of ligand on N2 activation in end-on vs. side-on N2 isomers …
Date:
May 2010
Creator:
Pierpont, Aaron
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Concept of Purgatory in England
It is not the purpose of this dissertation to present a history of Purgatory; rather, it is to show through the history the influence of purgatorial doctrine on the English lay community and the need of that community for this doctrine. Having established the importance this doctrine held for so many in England, with an examination of the chantry institution in England, this study then examines how this doctrine was stripped away from the laity by political and religious reformers during the sixteenth century. Purgatorial belief was adversely affected when chantries were closed in execution of the chantry acts under Henry VIII and Edward VI. These chantries were vital to the laity and not moribund institutions. Purgatorial doctrine greatly influenced the development and concept of the medieval English community. Always seen to be tightly knit, this community had a transgenerational quality, a spiritual and congregational quality, and a quality extending beyond the grave. The Catholic Church was central to this definition of community, distributing apotropaic powers, enhancing the congregational aspects, and brokering the relationship with the dead. The elements of the Roman liturgy were essential to community cohesiveness, as were the material and ritual supports for this liturgy. The need …
Date:
August 2010
Creator:
Machen, Chase E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Confronting Convergence: Are Higher Education Administrators Using a Strategic Planning Approach to Mass Communication Curriculum Convergence?
Professors in mass communications departments of higher education institutions continue to search for the best way to prepare graduates for the ever-changing world of print, broadcast, and online media. Business administration theories have long been used in other areas, including education. While some application of strategic planning has been documented with regards to education, there is not much to reference in this area. The study investigated the use of strategic planning in developing a course of action for curriculum convergence in mass communication programs. The study used a purposive sample to determine if administrators are utilizing this method as a part of curriculum convergence. The results indicated a use of this method among institutions involved in curriculum convergence.
Date:
May 2010
Creator:
Huckeba, Kristyn L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Cooperative Strategies for Distributed Digital Preservation: Toward a Reference Model for Distributed Digital Preservation
Presented at the Coalition of Networked Information (CNI) 2010 Spring Forum. This presentation presents findings from collaborative preservation projects undertaken by the MetaArchive Cooperative and the University of North Texas.
Date:
April 13, 2010
Creator:
Skinner, Katherine & Halbert, Martin
Object Type:
Presentation
System:
The UNT Digital Library
Copyright and Publication Agreements: Who Owns Your Work?
Presentation for the 2010 Open Access Symposium discussing ownership as interpreted by copyright and publication agreements.
Date:
May 18, 2010
Creator:
Buttler, Dwayne K.
Object Type:
Presentation
System:
The UNT Digital Library
The Correlates of Number of Minority Faculty, Minority Student Organizations, Diversity Course Offerings, and Geographic Location to Minority Student Enrollment in Texas Colleges
This study examined the correlates between the dependent variables African-American and Hispanic student enrollment in Texas public higher education to the independent variables institution type, education region, faculty demographics, curricular offerings and student organizations. Data for African-American (n = 124,000) and Hispanic enrollment (n = 314,000) in all Texas public higher education institutions (n = 109) for the 2008 academic year were examined. Significant results, using a statistical significance of p = .005, were reported for two of the variables. A correlation of Pearson's r = .946 and statistical significance of p = .000 was observed between African-American student enrollment and the percentage representation of African-American faculty in the same institution. A correlation of Pearson's r = .982 and statistical significance of p = .000 was observed between Hispanic student enrollment and the percentage representation of Hispanic faculty in the same institution. The results of this study found significant relationships between the presence of African-American and Hispanic faculty and enrollment of African-American and Hispanic students. Recommendations are made for exploring these findings in further detail.
Date:
August 2010
Creator:
Kraus, Charles
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Correlates of Video Game Addiction
Video game addiction often leads to a tremendous burden on those afflicted with the condition, draining their time, resources, and life away until they have nothing left. To further elucidate the problem of video game addiction, the current research examines the level of video game addiction of 111 participants, along with their motivation for their addictive behaviors, the quality of life of addicted individuals, and possible relations between video game addiction and other forms of addiction. Results of the current research indicate a correlation between addictive video game use and depression, alcohol use, a desire for escapism, a need for social interaction, and lack of self-control. The results of a multiple regression indicate that, amongst the various research factors, depression is the factor with the most significant link to addictive video game use, implying a dangerous correlation between mental health and an addictive behavior that some erroneously disqualify as a true addiction.
Date:
December 2010
Creator:
Langley, Alex
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Counterinsurgency Dilemma: The Causes and Consequences of State Repression of Human Rights in Civil Wars
In this project a theory of adaptive differential insurgency growth by the mechanism of repression driven contagion is put forth to explain variation in the membership and spatial expansion of insurgencies from 1981 to 1999. As an alternative to the dominant structural approaches in the civil war literature, Part 1 of the study proposes an interactive model of insurgency growth based on Most and Starr's opportunity and willingness framework. The findings suggest that state capacity, via its impact on state repressive behavior, plays an important gatekeeping function in selecting which minor insurgencies can grow into civil war, but contributes little to insurgency growth directly. In Part 2 of the study, I directly examine variation in insurgency membership and geographical expansion as a function of repression driven contagion. I find that repression increases the overall magnitude of insurgency activity within states, while at the same time reducing the density of insurgency activity in any one place. Despite an abundance of low intensity armed struggles against a highly diverse group of regimes around the world, I find an extremely strong and robust regularity: where repression is low - insurgencies don't grow.
Date:
May 2010
Creator:
Quinn, Jason Michael
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library