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419 Matching Results
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Mechanisms Affecting Bench Press Throw Performance while Using a Counter-Balanced Smith Machine
The use of a counter-balance weight system of a Smith machine affects measures of bench press throw performance. Twenty-four men performed bench press throws at 30% of their one-repetition maximum under four different conditions: 1) counter-balance and rebound movement (RC), 2) no counter-balance and rebound movement (RNC), 3) counter-balance and concentric only movement (CC), and 4) no counter-balance and concentric only movement (CNC). Peak power, force, and concentric and eccentric velocities were measured using a linear accelerometer; and peak ground reaction force (GRF) was measured using a forceplate. Peak measures for concentric and eccentric velocities showed that NCB> CB and RBT > CBT. Peak GRF measures showed CB > NCB and RBT > CBT. The lower performance measures for CB were likely due to an increase in the net external load when the barbell accelerates faster than the gravitational constant causing the counter-balance weight becomes ineffective.
Date:
May 2011
Creator:
Buddhadev, Harsh
System:
The UNT Digital Library
Examining Curvilinearity and Moderation in the Relationship between the Degree of Relatedness of Individual Diversification Actions and Firm Performance
Corporate diversification continues to be an important phenomenon in the modern business world. More than thirty years of research on diversification suggests that the degree of relatedness among a firm's business units is a factor that can affect firm performance, but the true effect of diversification relatedness on firm performance is still inconclusive. The purpose of this dissertation is to shed more light on this inconclusive association. However, attention is focused on the performance implications of individual diversification actions (e.g., acquisitions and joint ventures) rather than on the overall performance of firms with different levels of diversification. A non-experimental, longitudinal analysis of secondary data was conducted on over 450 unique acquisitions and on more than 210 joint ventures. Results suggest that even when individual diversification actions rather than entire business portfolios are examined, an inverted curvilinear association between diversification relatedness and performance is likely to emerge. This pattern is observed in both acquisitions and joint ventures. However, the association between diversification relatedness and performance in acquisitions is moderated by the level of industry adversity, though factors such as corporate coherence and heterogeneous experience do not moderate the association between diversification relatedness and performance. This study augments the body of knowledge …
Date:
May 2011
Creator:
Cernas Ortiz, Daniel Arturo
System:
The UNT Digital Library
Dream of a Thousand Keys: A Concerto for Piano and Orchestra
Dream of a Thousand Keys is a concerto for piano and orchestra, which consists of four movements presenting multiple dimensional meanings as suggested by the word "key." I trace the derivation of Korean traditional rhythmic cycles and numerical sequences, such as the Fibonacci series, that are used throughout the work, and explore the significant role of space between the soloist and piano that are emphasized in a theatrical aspect of the composition. The essay addresses the question of musical contrasts, similarities, and metamorphosis. Lastly, I cover terms and concepts of significant 21st-century compositional techniques that come into play in the analysis of this work.
Date:
May 2011
Creator:
Choi, Da Jeong
System:
The UNT Digital Library
Factors Associated with Risky Sexual Behavior Among Homeless Youth
Homeless youth face numerous risks. Data on 602 homeless youth from the Midwest Homeless and Runaway Study and binary logistic regression were used to identify factors associated with their participation in risky sexual behaviors. Specifically, the effects of abuse/neglect and three potential moderating resiliency indicators, namely self-esteem, parental warmth, and parental monitoring, on having sex before adulthood and thinking about trading sex for food or shelter were examined. While none of the three resiliency indicators had the hypothesized moderating effects, controlling for abuse/neglect and various sociodemographic characteristics, parental monitoring had a direct, negative effect on having sex before adulthood, and self-esteem and parental warmth had direct, negative effects on thinking about trading sex for food or shelter. Policy implications of the findings are discussed.
Date:
May 2011
Creator:
Cooksey, Christy
System:
The UNT Digital Library
Campania In-Felix (Unhappy Country)
This documentary film explores the damages produced by the illegal dumping of toxic waste in the environment and the rise in health concerns specific to the Campania region in Southern Italy. The management of waste material in the region is in the hands of the Camorra - a mafia organization with vast economic and political power. Through the narration of personal stories, the documentary reveals the broken emotional and cultural balance between the people from the region and their land.
Date:
May 2011
Creator:
Corsale, Ivana
System:
The UNT Digital Library
Characterization of Triclocarban, Methyl- Triclosan, and Triclosan in Water, Sediment, and Corbicula Fluminea (Müller, 1774) Using Laboratory, in Situ, and Field Assessments
In the last decade emerging contaminants research has intensified in a bid to answer questions about fate, transport, and effects as these chemicals as they get released into the environment. The chemicals of interest were the antimicrobials; triclocarban (TCC) and triclosan (TCS), and a metabolite of triclosan, methyl triclosan (MTCS). This research was designed to answer the question: what is the fate of these chemicals once they are released from the waste water treatment plant into receiving streams. Three different assessment methods; field monitoring, in-situ experiments, and laboratory studies were used to answer the overall question. TCS, TCC, and MTCS levels were measured in surface water, sediment and the Asiatic clam Corbicula fluminea. Field studies were conducted using four sites at Pecan Creek, Denton TX. Levels of all three chemicals in clams were up to fives orders of magnitude the water concentrations but an order of magnitude lower than in sediment. Highest sediment levels of chemicals were measured in samples from the mouth of Pecan Creek (highest organic matter). TCC was the most and TCS was the least accumulated chemicals. In-situ and lab studies both indicated that uptake of these chemicals into the clams was very rapid and measurable within …
Date:
May 2011
Creator:
Edziyie, Regina E.
System:
The UNT Digital Library
Tesla Turbine Torque Modeling for Construction of a Dynamometer and Turbine
While conventional turbines have been extensively researched and tested, Tesla and boundary layer type turbines have not. In order to construct a dynamometer, thermodynamic flow apparatus and future turbines, we modeled the Tesla turbine using theoretical calculations and preliminary experiments. Thus a series of experiments were run to determine stall torque and maximum run speed for a known pressure range. This data was then applied to modeling formulas to estimate stall torque over an extended range of variables. The data were then used to design an appropriate dynamometer and airflow experiment. The model data also served to estimate various specifications and power output of the future turbine. An Obi Laser SSTG‐001 Tesla turbine was used in the experiments described. Experimental stall torque measurements were conducted in two stages. Shaft speed measurements were taken with an optical laser tachometer and Tesla turbine stall torque was measured using a spring force gauge. Two methods were chosen to model Tesla turbine stall torque: 1) flow over flat plate and 2) free vortex with a sink. A functional dynamometer and thermodynamic apparatus were constructed once the model was confirmed to be within the experimental uncertainty. Results of the experiments show that the experimental turbine …
Date:
May 2011
Creator:
Emran, Tamir Ali
System:
The UNT Digital Library
Hispanic Women Leaders in K‒12 Public Education: Overcoming Barriers to Success
Scholarly research has been written on the forces behind the barriers preventing Hispanic women from reaching the top of the public school ladder. These barriers are to be recognized and addressed. This study focuses not on the barriers which hinder forward and upward career movement, but instead examines how many Hispanic American women have not allowed these barriers to prevent them from achieving their goals of attaining the principalship. This study seeks to determine how Hispanic women principals came to grips with the challenges and barriers to promotion, and to success as K‒12 school leaders. This qualitative research study consisted of 12 Hispanic female school principals from the Dallas/Fort Worth metropolitan area. The three districts selected were Fort Worth Independent School District, Arlington Independent School District, and Grand Prairie Independent School District. Three principals were from Grand Prairie Independent School District, two principals were from Arlington Independent School District, and seven principals were from the Fort Worth Independent School District. All of the 12 Hispanic school principals were interviewed. From the responses to each of the questions, themes became evident. The themes expressed what individual principals had done and the strategies they used to overcome the varied barriers which they …
Date:
May 2011
Creator:
Falk, Cora Torres
System:
The UNT Digital Library
France and the United States: Borrowed and Shared National Symbols
This thesis analyzes and demonstrates the similarities and differences between some of the national symbols of France and the United States. This includes the shared and borrowed aspects of each one and the ways in which each culture is reflected through, and built around them. The flags, national anthems, and several national icons such as France's Marianne and Uncle Sam are discussed. This analysis deals with the historical contexts and cultural meanings of the symbols, showing the changes each has undertaken in form and in national and international importance. Through the study of national symbols, this thesis reveals the similarities along with the differences between the two nations, which are often perceived as being highly dissimilar and even opposing in belief systems, cultures, and histories.
Date:
May 2011
Creator:
Crawford, Katlyn Marie
System:
The UNT Digital Library
Effects of the Texas Principal Excellence Program on Texas Principal Leadership Behavior and School Outcomes
The purpose of this study was to examine the leadership and school outcome effects of the Texas Principal Improvement program; which authorized the School Leadership Pilot Program under Texas Education Code 11.203. The specific research questions were: What effects did participating in the Texas Principal Excellence Program in 2009-2010 have on participants and their schools? What changes in participants' self-reported and peer-observed leader behaviors occurred between the initial assessment at the onset of the program and the final assessment once the program was completed? What changes were experienced in school's passing rate on mathematics and reading TAKS in schools having the same principal for the two years in 2008-2009 (pre-participation) and 2009-2010 (post participation). The research used TxPEP participating principals who agreed to take part in the study. Principals and a selected group of people who worked with them completed a 360-degree leadership feedback instrument addressing nine leadership competencies at the beginning and end of the program. Paired samples t-tests were used to determine if changes from pre-participation to post-participation were statistically significant. When a statistically significant difference was found, effect size and confidence intervals were calculated to place the data in context. Multiple regression and propensity score matching were …
Date:
May 2011
Creator:
Fouche, Todd P.
System:
The UNT Digital Library
The Role of Social Integration in the Persistence of African American Men in College
This qualitative study addressed the experiences of African American males attending a predominantly White university as undergirded by the social integration aspects of Tinto's model of academic and social integration. The methodology was case study. Sixteen semi-structured interviews were held with currently enrolled seniors to capture the lived experiences of their reasons for attending college as well as major influences that contributed to their persistence decisions. The results revealed emerging themes of positive and negative family influence, religious beliefs, and a sense of self-efficacy as instrumental factors for the students' persistence. The level of social integration tended to differ by the age classification (traditional college-going versus non-traditional college student) and by the level of parental education. The components of the social integration model, as developed by Tinto contributed little to the sample's persistence decisions when compared to the themes presented during the interviews. Three observations emerged from the data: (1) The experiences of the non-traditional aged participants were different from the traditional aged college student experiences; (2) Although the participants experienced varying levels of social integration, for most of the 16 students, their persistence decisions were influenced more by their positive and negative relationships with family, religious beliefs, and sense …
Date:
May 2011
Creator:
Garrett-Spencer, Jacqueline
System:
The UNT Digital Library
A Preliminary Analysis of Interactions Between Sibling training and Toy Preferences
Siblings of children who have been diagnosed with autism can play important roles in the lives of their brothers or sisters. Previous literature shows that siblings can effectively change behavior and can increase play interactions. Furthermore, the use of preferred materials may enhance social interactions between the siblings. The purpose of this study was to determine, the effects that material preferences and choices have on sibling social bids and cooperative play during a sibling training program. There were two main objectives. The first objective was to evaluate the effects of teaching with the high preference toy of the neuro-typical sibling during sibling training. The second objective was to determine if the training would produce different effects across four different toy conditions. Measures included social bids made by each of the siblings and cooperative play. Results indicate that teaching with the neuro-typical siblings' high preference toy during sibling training can be an effective method to increase social bids and cooperative play. The results of this study are discussed in the contexts of preference and choice selections, physical environments, motor skills, carry over effects, and participations based on gender.
Date:
May 2011
Creator:
Greer, Julie Winn
System:
The UNT Digital Library
El ékfrasis en la Poesía De Manual Machado
Manuel Machado is known as one of the most innovative Spanish modernist poets of the twentieth century. Despite his recognition as a literary figure in Spain, the mimetic descriptions in Machado's poetics are interpreted as mere innovations in Spanish poetry. Those mimetic descriptions are examples of ekphrasis in Spanish literature. Ekphrasis is both a literary and representational art. The mimetic dimension in Machado's poetry is ignored or misinterpreted by the critics of his poetics. This study written in Spanish investigates the use of ekphrasis in terms of Machado's poetic style. An analysis of Manuel Machado's ekphrastic poems will determine: ekphrastic poetry is a representational art; how visual and acoustic aspects of Machado's poems create enargeia; and the manifestation of ekphrasis in Spanish verse. In using Machado's poems, this project will contribute to future explorations of ekphrasis in Spanish literature.
Date:
May 2011
Creator:
Carrillo, Yolanda
System:
The UNT Digital Library
Parent-Toddler Training: The Merits of Further Analysis
Earlier identification of autism allows for interventions to begin during toddlerhood. Literature suggests that parents are an important part of very early intervention and specific goals have indicated that they are important to progress. The use of telemedicine may increase access to interventions. The purpose of the study was to evaluate a parent-toddler training program that targeted social-communication skills and incorporated a telemedicine component. Measures included parent teaching targets, child attending, vocal requesting, and coordinated joint attention and the parent's response to coordinated joint attention. Results indicate that parent teaching increased, child attending and vocalizations increased, child coordinated joint attention increased, and the parent's response to coordinated joint attention was primarily social in nature. Analysis of the home observations indicates that direct in home observations or teleconference observations neither under or overestimated behaviors. The results are discussed in the context of teaching and feedback delivery and selection of teaching targets.
Date:
May 2011
Creator:
Cermak, Samantha Marie
System:
The UNT Digital Library
Algebraically Determined Semidirect Products
Let G be a Polish group. We say that G is an algebraically determined Polish group if given any Polish group L and any algebraic isomorphism from L to G, then the algebraic isomorphism is a topological isomorphism. We will prove a general theorem that gives useful sufficient conditions for a semidirect product of two Polish groups to be algebraically determined. This will smooth the way for the proofs for some special groups. For example, let H be a separable Hilbert space and let G be a subset of the unitary group U(H) acting transitively on the unit sphere. Assume that -I in G and G is a Polish topological group in some topology such that H x G to H, (x,U) to U(x) is continuous, then H x G is a Polish topological group. Hence H x G is an algebraically determined Polish group. In addition, we apply the above the above result on the unitary group U(A) of a separable irreducible C*-algebra A with identity acting transitively on the unit sphere in a separable Hilbert space H and proved that the natural semidirect product H x U(A) is an algebraically determined Polish group. A similar theorem is true …
Date:
May 2011
Creator:
Jasim, We'am Muhammad
System:
The UNT Digital Library
Replication and Extension of a Comprehensive Staff Training Program for an Autism Treatment Program
Previous research has shown that early and intensive behavioral interventions are an effective treatment for young children with autism resulting meaningful gains that can maintain over time. For behavioral treatments to be effective, service providers need to be competently trained in behavioral interventions through staff training. The purpose of the current study was to replicate and extend previous research by employing a more rigorous research design, and including measures of teaching units, and staff and child affect measures. The trainee was taught 150 skills. Training methods included descriptions, modeling, practice, and feedback. Results showed that the trainee acquired all skills while maintaining an increasing number of teaching units. Child and staff also maintained favorable affect as training progressed. In addition, staff reported the training as very effective and highly satisfactory. This shows that comprehensive training packages that comprise a large set of skills in real life treatment settings can result in benefits for the staff and children.
Date:
May 2011
Creator:
Johnson, Kellyn Joi
System:
The UNT Digital Library
Texas High School Principals' Attitudes Toward the Inclusion of Students with Disabilities in the General Education Classroom
This study examined Texas high school principals' attitudes toward the inclusion of students with disabilities in the general education classroom. School leaders today face increasing demands with the revised state accountability system. For example, students with disabilities are required to take the Texas Assessment Knowledge and Skills Test (TAKS) and on grade level. Hence, one of the strategies of schools has been to mainstream or include special education students in the regular classroom. Inclusion provides the opportunity for students with disabilities to be educated in the general education curriculum with their non-disabled peers. This study investigated the attitudes of Texas high school principals' attitudes toward the inclusion of students with disabilities in the general education classroom. The principals' personal experiences, professional training, and formal training in inclusion were examined. This study was a qualitative study using survey methodology. The Principal's Inclusion Survey developed by Cindy Praisner and G.H. Stainback was distributed electronically to 1211 Texas high schools. With the permissions of Praisner and Stainback, the survey was loaded into Survey Monkey, which is a website for creation of professional online surveys. Data was analyzed using descriptive statistics. The return rate was 395 (32.1%) overall responses. The results of the study …
Date:
May 2011
Creator:
Farris, Troy K.
System:
The UNT Digital Library
Processing Instruction and Teaching Proficiency Through Reading and Storytelling: A Study of Input in the Second Language Classroom
This paper reports a study of VanPatten's processing instruction (PI) and Ray's TPRS. High school students in a beginning Spanish course were divided into three groups (PI, TPRS, and control) and instructed in forms using the Spanish verb gustar. Treatment included sentence-level and discourse-level input, and tests included interpretation and production measures in a pretest, an immediate posttest, and a delayed posttest given two and a half months following treatment. The PI group made the greatest gains in production measures and in a grammaticality judgment test, and the TPRS group made the greatest gains in written fluency. The PI group's statistical gains in production measures held through the delayed posttest.
Date:
May 2011
Creator:
Foster, Sarah Jenne
System:
The UNT Digital Library
Geologic and Lithic Analysis of the Red River Cache
The Red River Cache is an assemblage of 33 bifaces, found in Cooke County, along Cache Creek, a tributary to the Red River. Also found with the cache was a hearth which yielded charcoal for AMS dating which returned an age of 2770- 2710 Cal YBP placing the cache in the Late Archaic. The geologic investigation of Cache Creek established 3 Holocene allostratigraphic units that provide information depositional environments adjacent to the Red River. Lithic analysis explored the production of bifaces during the Late Archaic and compared the cache to regional records. Using both geologic and lithic analysis this thesis investigates the temporal and cultural context of the cache using a geoarchaeological approach.
Date:
May 2011
Creator:
Gregory, Brittney
System:
The UNT Digital Library
The Development of an Analytical Microwave Electromagnetic Pulse Transmission Probe and Preliminary Test Results
Within this educational endeavor instrumental development was explored through the investigation of microwave induce stable electromagnetic waves within a non-linear yttrium iron garnet ferromagnetic waveguide. The resulting magnetostatic surface waves were investigated as a possible method of rapid analytical evaluation of material composition. Initial analytical results indicate that the interaction seen between wave and material electric and magnetic fields will allow phase coherence recovery andanalysis leading to enhancement of analytical value. The ferromagnetic waveguide selected for this research was a high quality monocrystalline YIG (yttrium iron garnet) film. Magnetostatic spin waves (MSW) were produced within the YIG thin waveguide. Spin waves with desired character were used to analytically scan materials within the liquid and solid phase.
Date:
May 2011
Creator:
Griffith, William Francis
System:
The UNT Digital Library
Investigating Molecular Structures: Rapidly Examining Molecular Fingerprints Through Fast Passage Broadband Fourier Transform Microwave Spectroscopy
Microwave spectroscopy is a gas phase technique typically geared toward measuring the rotational transitions of Molecules. The information contained in this type of spectroscopy pertains to a molecules structure, both geometric and electronic, which give insight into a molecule's chemistry. Typically this type of spectroscopy is high resolution, but narrowband ≤1 MHz in frequency. This is achieved by tuning a cavity, exciting a molecule with electromagnetic radiation in the microwave region, turning the electromagnetic radiation o, and measuring a signal from the molecular relaxation in the form of a free induction decay (FID). The FID is then Fourier transformed to give a frequency of the transition. "Fast passage" is defined as a sweeping of frequencies through a transition at a time much shorter (≤10 s) than the molecular relaxation (≈100 s). Recent advancements in technology have allowed for the creation of these fast frequency sweeps, known as "chirps", which allow for broadband capabilities. This work presents the design, construction, and implementation of one such novel, high-resolution microwave spectrometer with broadband capabilities. The manuscript also provides the theory, technique, and motivations behind building of such an instrument. In this manuscript it is demonstrated that, although a gas phase technique, solids, liquids, …
Date:
May 2011
Creator:
Grubbs, Garry Smith, II
System:
The UNT Digital Library
Synthesis and Characterization of Copper Releasing Polymer Nanoparticles
Polymeric nanoparticles were synthesized and loaded with Cu²⁺ to explore the therapeutic potential for catically active transition metal ions and complexes other than cisplatin. Two types of nanoparticles were synthesized to show the potential for polymer based vectors. Copper loading and release were characterized via inductively coupled plasma mass spectrometry (ICP MS), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and elemental analysis. Results demonstrated that Cu could be loaded to the nano-sized carriers in an aqueous environment, and that the release was pH-dependent. The toxicity of these particles was measured in HeLa cells where significant toxicity was observed in vitro via dosing of high Cu-loaded nanoparticles. No significant toxicity was observed in cells dosed with Cu-free nanoparticles.
Date:
May 2011
Creator:
Harris, Alesha N.
System:
The UNT Digital Library
Nihilism and the Formulation of a Philosophy of Art
Nihilism is often associated with feelings of despair, hopelessness and meaningless. It is certainly true that once the implications of this philosophy become apparent that these feelings are valid. However, this reaction is merely the first stage of dealing with nihilism and stopping here fails to examine the various types of nihilism that deal specifically with knowledge, ethics, metaphysics, truth, and art. Nihilism at its base is a philosophy that recognizes the history of human thought and what it means to be and to think. My focus is the way in which a completed nihilism is in fact an emancipatory act and the implications it has for art and the artist in the 21st century.
Date:
May 2011
Creator:
Hernandez, Brian
System:
The UNT Digital Library
An Exploratory Study of Students' Use of Facebook and Other Communication Modalities in Order to Receive Student Affairs Information
This qualitative study explored Facebook as a communication tool for student affairs and compared it as a source with other communication modalities to describe the 18-24 year old student preference on receiving information about student affairs departments and activities. The research questions were designed to provide feedback on the current purpose[s] of student use of Facebook for student affairs services as well as reporting additional services and activities that would be considered through the use of Facebook. Differences in use among institutional types were also explored. The results of 395 online survey responses were compared to focus groups consisting of student ambassadors at a two-year public, four-year private, and four-year public institution. The online survey participants were asked to respond to specific modes of communication based upon each service or activity. The focus groups were asked the same questions in an open-ended format and the results were compared to the online results. The results indicate that depending on the event or activity, the students preferred a different method of communication, not necessarily Facebook for information on student affairs programming. These results also differed among institutional types. Two-year institutions have the greatest potential to increase their presence on Facebook. One theme …
Date:
May 2011
Creator:
Huppe, Alicia
System:
The UNT Digital Library