Access
Collection
Degree Department
Department of Psychology
45
College of Music
42
Department of History
26
Department of Counseling and Higher Education
24
Department of Teacher Education and Administration
23
Department of Biological Sciences
20
Department of Chemistry
17
Department of English
16
Department of Electrical Engineering
15
Department of Sociology
15
48 More
Degree Discipline
Degree Level
Country
Year
Month
Language
419 Matching Results
Results open in a new window/tab.
A Bidirectional Two-Hop Relay Network Using GNU Radio and USRP
A bidirectional two-hop relay network with decode-and-forward strategy is implemented using GNU Radio (software) and several USRPs (hardware) on Ubuntu (operating system). The relay communication system is comprised of three nodes; Base Station A, Base Station B, and Relay Station (the intermediate node). During the first time slot, Base Station A and Base Station B will each transmit data, e.g., a JPEG file, to Relay Station using DBPSK modulation and FDMA. For the final time slot, Relay Station will perform a bitwise XOR of the data, and transmit the XORed data to Base Station A and Base Station B, where the received data is decoded by performing another XOR operation with the original data.
Date:
August 2011
Creator:
Le, Johnny
System:
The UNT Digital Library
Nanoscale Materials Applications: Thermoelectrical, Biological, and Optical Applications with Nanomanipulation Technology
In a sub-wavelength scale, even approaching to the atomic scale, nanoscale physics shows various novel phenomena. Since it has been named, nanoscience and nanotechnology has been employed to explore and exploit this small scale world. For example, with various functionalized features, nanowire (NW) has been making its leading position in the researches of physics, chemistry, biology, and engineering as a miniaturized building block. Its individual characteristic shows superior and unique features compared with its bulk counterpart. As one part of these research efforts and progresses, and with a part of the fulfillment of degree study, novel methodologies and device structures in nanoscale were devised and developed to show the abilities of high performing thermoelectrical, biological, and optical applications. A single β-SiC NW was characterized for its thermoelectric properties (thermal conductivity, Seebeck coefficient, and figure of merit) to compare with its bulk counterpart. The combined structure of Ag NW and ND was made to exhibit its ability of clear imaging of a fluorescent cell. And a plasmonic nanosture of silver (Ag) nanodot array and a β-SiC NW was fabricated to show a high efficient light harvesting device that allows us to make a better efficient solar cell. Novel nanomanipulation techniques were …
Date:
August 2011
Creator:
Lee, Kyung-Min
System:
The UNT Digital Library
Personnel Preparation in Special Education: An Exploration of Autism Spectrum Disorders Programmatic Changes in Institutions of Higher Education Teacher Training Programs
Programmatic change related to autism spectrum disorders (ASD) training in special education teacher education programs across the U.S. and institutional variables that influenced change were examined. Variables included institutions’ current coverage of autism content in coursework and institution enrollment. One faculty member from each identified institution was invited to participate in the study. Data were collected from 136 special education faculty using an exploratory survey instrument, the National Survey on ASD Preparation in Undergraduate Special Education Teacher Training Programs (NSAP). This study was designed around themes which emerged from empirical and pragmatic research findings conceptualizing prevalent issues in personnel preparation for ASD including critical knowledge and skills needed by teachers to effectively serve students with ASD. Results indicated a significant number of programmatic changes (66%) remain to be implemented in undergraduate special education programs at institutions participating in the study.
Date:
August 2011
Creator:
Lett-Stallworth, Tawana
System:
The UNT Digital Library
Image Representation and Interactivity: An Exploration of Utility Values, Information-Needs and Image Interactivity
This study was designed to explore the relationships between users and interactive images. Three factors were identified and provided different perspectives on how users interact with images: image utility, information-need, and images with varying levels of interactivity. The study used a mixed methodology to gain a more comprehensive understanding about the selected factors. An image survey was used to introduce the participants to the images and recorded utility values when given a specific task. The interviews allowed participants to provide details about their experiences with the interactive images and how it affected their utility values. Findings from the study showed that images offering the highest level of interactivity do not always generate the highest utility. Factors such as personal preference, specifically speed and control of the image, affect the usefulness of the image. Participant also provided a variety of uses where access to interactive images would be beneficial. Educational settings and research tools are a few examples of uses provided by participants.
Date:
August 2011
Creator:
Lewis, Elise C.
System:
The UNT Digital Library
Genetic Analysis of Development and Behavior in Hypoxia and Cellular Characterization of Anoxia Induced Meiotic Prophase Arrest in Caenorhabditis Elegans
It was hypothesized that chronic hypoxia will affect various biological processes including developmental trajectory and behavior. To test this hypothesis, embryos were raised to adulthood in severe hypoxic environments (0.5% O2 or 1% O2, 22°C) and analyzed for survival rate, developmental progression, and altered behaviors. Wildtype hermaphrodites survive chronic hypoxia yet developmental trajectory is slowed. The hermaphrodites raised in chronic hypoxia had different phenotypes in comparison to the normoxic controls. First, hermaphrodites exposed to chronic hypoxia produced a significantly lower number of embryos and had a slight increase in male progeny. This suggests that chronic hypoxia exposure during development affects the germline. Second, animals raised in chronic hypoxia from embryos to young adults have a slight increase in lifespan when re-exposed to a normoxic environment, indicating that chronic hypoxia does not negatively decrease lifespan. Finally, hermaphrodites that were raised in hypoxia will lay the majority of their eggs on the area of the agar plate where the bacterial lawn is not present. This is in contrast to animals in normoxia, which lay the majority of their eggs on the bacterial lawn. One hypothesis for this hypoxia-induced egg-laying behavior is that the animal can sense microenvironments in hypoxia. To examine if …
Date:
August 2011
Creator:
Little, Brent Ashley
System:
The UNT Digital Library
Molecular Basis of Plant Defense Against Aphids: Role of the Arabidopsis Thaliana PAD4 and MPL1 Genes
Myzus persicae (Sülzer), commonly known as green peach aphid (GPA), utilizes its slender stylet to penetrate the plant tissues intercellularly and consume copious amounts of photoassimilates present in the phloem sap causing extensive damage to host plants. The compatible interaction between GPA and Arabidopsis thaliana enabled us to characterize plant response to aphid infestation. Upon GPA infestation, Arabidopsis PAD4 (PHYTOALEXIN DEFICIENT4) gene modulates premature leaf senescence, which is involved in the programmed degradation of cellular components and the export of nutrients out of the senescing leaf. Senescence mechanism is utilized by plants to limit aphid growth. In addition, PAD4 provides antixenosis (deters insect settling and feeding) and antibiosis (impair aphid fecundity) against GPA and adversely impact sieve element availability to GPA. Basal expression of PAD4 contributes to antibiosis, and the GPA-induced expression of PAD4 contributes to antixenosis. Mutation in the Arabidopsis stearoyl-ACP desaturase encoding SSI2 (suppressor of SALICYLIC ACID [SA] insensitivity2) gene that results in an accelerated cell death phenotype and dwarfing, also conferred heightened antibiosis to GPA. Results of this study indicate that PAD4 is required for the ssi2-mediated enhanced antibiosis to GPA. The PAD4 protein contains conserved Ser, Asp and His residues that form the catalytic triad of …
Date:
August 2011
Creator:
Louis, Joe
System:
The UNT Digital Library
Biocompatible Hybrid Nanomaterials Involving Polymers and Hydrogels Interfaced with Phosphorescent Complexes and Toxin-Free Metallic Nanoparticles for Biomedical Applications
The major topics discussed are all relevant to interfacing brightly phosphorescent and non-luminescent coinage metal complexes of [Ag(I) and Au(I)] with biopolymers and thermoresponsive gels for making hybrid nanomaterials with an explanation on syntheses, characterization and their significance in biomedical fields. Experimental results and ongoing work on determining outreaching consequences of these hybrid nanomaterials for various biomedical applications like cancer therapy, bio-imaging and antibacterial abilities are described. In vitro and in vivo studies have been performed on majority of the discussed hybrid nanomaterials and determined that the cytotoxicity or antibacterial activity are comparatively superior when compared to analogues in literature. Consequential differences are noticed in photoluminescence enhancement from hybrid phosphorescent hydrogels, phosphorescent complex ability to physically crosslink, Au(I) sulfides tendency to form NIR (near-infrared) absorbing AuNPs compared to any similar work in literature. Syntheses of these hybrid nanomaterials has been thoroughly investigated and it is determined that either metallic nanoparticles syntheses or syntheses of phosphorescent hydrogels can be carried in single step without involving any hazardous reducing agents or crosslinkers or stabilizers that are commonly employed during multiple step syntheses protocols for syntheses of similar materials in literature. These astounding results that have been discovered within studies of hybrid nanomaterials …
Date:
August 2011
Creator:
Marpu, Sreekar B.
System:
The UNT Digital Library
A Champion for the Chicano Community: Anita N. Martínez and Her Contributions to the City of Dallas, 1969-1973
Much has been published in Chicano studies over the past thirty to forty years; lacking in the historiography are the roles that Chicanas have played, specifically concerning politics in Dallas, Texas. How were Chicanas able to advance El Movimiento (the Mexican American civil rights movement)? Anita Martínez was the first woman to serve on the Dallas City Council and the first Mexican American woman to be elected to the city council in any major U.S. city. She served on the council from 1969 to 1973 and remained active on various state and local boards until 1984. Although the political system of Dallas has systematically marginalized Mexican American political voices and eradicated Mexican American barrios, some Mexican Americans fought the status quo and actively sought out the improvement of Mexican barrios and an increase in Mexican American political representation, Anita N. Martínez was one of these advocates. Long before she was elected to office, she began her activism with efforts to improve her children’s access to education and efforts to improve the safety of her community. Martinez was a champion for the Chicano community, especially for the youth. Her work for and with young Chicanos has earned her the moniker, “Defender …
Date:
August 2011
Creator:
Cloer, Katherine Reguero
System:
The UNT Digital Library
Psychological Maltreatment and Adult Attachment: The Protective Role of the Sibling Relationship
A positive sibling relationship may protect individuals against poor developmental outcomes associated with psychological maltreatment. The current study assessed the moderating role of a positive sibling relationship in childhood and adulthood on associations between early psychological maltreatment and adult attachment anxiety and avoidance. College students (N = 270) completed self-report measures of psychological maltreatment, sibling relationship quality, and adult attachment. Psychological maltreatment in childhood was associated with an increase in attachment anxiety and avoidance, while a positive sibling relationship was related to a decrease in levels of attachment anxiety and avoidance. As predicted, a positive childhood sibling relationship mitigated the negative effects of psychological neglect in childhood on attachment. Similarly, a positive sibling relationship decreased the levels of attachment anxiety associated with isolation in childhood.
Date:
August 2011
Creator:
Collier, Laura C.
System:
The UNT Digital Library
¿Cuándo te Veré? “When Will I See You?”
This film examines the phenomenon of a family divided by the U.S.-Mexico border. Saul, the head of the family, migrated north in search of a better life for his wife and children while they stayed behind in Mexico. Not having the documents to cross the border has resulted in being apart from his family for more than ten years. This is a story about separation, pain, and the ultimate sacrifice a family makes as a means of survival.
Date:
August 2011
Creator:
Colunga, Elizabeth H.
System:
The UNT Digital Library
Redacted Dominionism: An Evangelical, Environmentally Sympathetic Reading of the Early Genesis Narrative
Critiques of the environmental ramifications of the early Genesis narrative by environmental thinkers such as Aldo Leopold, Ian McHarg, and Lynn White underscore a longstanding tension between the environmental movement and Western Christianity. The evangelical community (EC) especially, has been at odds with the environmental movement, as the EC grounds its theology regarding human relations to nature on the Genesis narrative—and especially the Genesis 1:26-28 dominion mandate— interpreted with a literal hermeneutic. The EC generally concludes in favor of either a dominionist interpretation, that mankind has dominion over nature, or a stewardship interpretation, that mankind’s dominion is more akin to tending or stewarding than to domination. Both interpretations trend toward the anthropocentrism that Leopold, McHarg, and White criticize. J. Baird Callicott postulates a third, less anthropocentric view: the citizenship interpretation, that humanity is co-citizen with nonhuman beings, rather than a superior. Callicott’s view, while commendable on key points, is incompatible with EC methodology because it is grounded only on Genesis 2 and subsequent passages, rejecting the legitimacy of Genesis 1:26-28 altogether. A fourth interpretation is proposed here, redacted dominionism, derived using EC methodology, and claiming that human relations to nature are based on theocentric themes. Redacted dominionism understands humanity as …
Date:
August 2011
Creator:
Cone, Christopher
System:
The UNT Digital Library
Spatial Patterns in Development Regulation: Tree Preservation Ordinances of the DFW Metropolitan Area
Land use regulations are typically established as a response to development activity. For effective growth management and habitat preservation, the opposite should occur. This study considers tree preservation ordinances of the Dallas-Fort Worth metropolitan area as a means of evaluating development regulation in a metropolitan context. It documents the impact urban cores have on regulations and policies throughout their region, demonstrating that the same urban-rural gradient used to describe physical components of our metropolitan areas also holds true in terms of policy formation. Although sophistication of land use regulation generally dissipates as one moves away from an urban core, native habitat is more pristine at the outer edges. To more effectively protect native habitat, regional preservation measures are recommended.
Date:
August 2011
Creator:
Cox, Carissa
System:
The UNT Digital Library
Bipolar Disorder in the Family: Impact on Functioning and Adjustment to College
Bipolar disorder is a serious mental disorder, affecting anywhere from 2 to 4 percent of Americans. Though research has indicated that this disorder can be devastating for patients, less is known about how the disorder impacts family members. There is no research that has considered impacts on family members adjusting to college. The purpose of the current study was to determine the extent to which having a family member with bipolar disorder impacts adjustment to college, as well as factors that might account for worse functioning. Two groups were recruited: students with a bipolar family member (n = 25) and students with no family history of the disorder (n = 50). Participants were interviewed regarding their own histories of a mood disorder, as well as mood disorder histories in their immediate families. They then completed surveys assessing adjustment to college, functioning, caregiving burden, parental relationship, and attachment style. Students with a family history of bipolar disorder had significantly lower social adjustment scores, lower personal-emotional adjustment scores, and lower financial functioning scores than students without this history. Lower scores were found even after controlling for psychopathology. Avoidant attachment behaviors, anxious attachment behaviors, and aspects of the paternal relationship were identified as …
Date:
August 2011
Creator:
Crandall, Erin
System:
The UNT Digital Library
Social Capital and Delinquency among Turkish Juveniles
This study examined the relationship between aspects of social capital and self-reported delinquency among Turkish juveniles by using a secondary dataset, which is a part of the European Youth Survey. The survey was conducted among tenth graders in 2007 in Bağcılar, Istanbul. The dependent variable of this study, delinquency, was divided into two groups, minor and major, according to the stipulations of the Turkish Penal Code. Social capital was measured by assessing adolescents’ reports of their direct interactions with their parents, peers and community. In order to predict the likelihood of major and minor delinquency independently, two different subsets (N: 1879 and 1837, respectively) of the data set were used. The findings of the multivariate analyses suggest that a low level of social capital contributed significantly to Turkish juveniles’ engagement in major and minor delinquent activities. Among the social capital items, adolescents’ affiliation with delinquent peers had the strongest correlation with both dependent variables.
Date:
August 2011
Creator:
Cubukcu, Suat
System:
The UNT Digital Library
Design and Development of Soft Landing Ion Mobility: A Novel Instrument for Preparative Material Development
The design and fabrication of a novel soft landing instrument Soft Landing Ion Mobility (SLIM) is described here. Topics covered include history of soft landing, gas phase mobility theory, the design and fabrication of SLIM, as well as applications pertaining to soft landing. Principle applications devised for this instrument involved the gas phase separation and selection of an ionized component from a multicomponent gas phase mixture as combing technique to optimize coatings, catalyst, and a variety of alternative application in the sciences.
Date:
August 2011
Creator:
Davila, Stephen Juan
System:
The UNT Digital Library
Prison Productions: Textiles and Other Military Supplies from State Penitentiaries in the Trans-Mississippi Theater during the American Civil War
This thesis examines the state penitentiaries of Louisiana, Arkansas, and Texas that became sources of wartime supplies during the Civil War. A shortage of industry in the southwest forced the Confederacy to use all manufactories efficiently. Penitentiary workshops and textile mills supplied a variety of cloth, wood, and iron products, but have received minimal attention in studies of logistics. Penitentiary textile mills became the largest domestic supplier of cloth to Confederate quartermasters, aid societies, citizens, slaves, and indigent families. This study examines how penitentiary workshops converted to wartime production and determines their contribution to the Confederate war effort. The identification of those who produced, purchased, distributed, and used penitentiary goods will enhance our knowledge of overall Confederate supply.
Date:
August 2011
Creator:
Derbes, Brett J.
System:
The UNT Digital Library
Photophysics and Photochemistry of Copper(I) Phosphine and Collidine Complexes: An Experimental/Theoretical Investigation
Copper(I) complexes have been studied through both experimental and computational means in the presented work. Overall, the work focuses on photophysical and photochemical properties of copper(I) complexes. Photophysical and photochemical properties are found to be dependent on the geometries of the copper(I) complexes. One of the geometric properties that are important for both photochemical and photophysical properties is coordination number. Coordination numbers have been observed to be dependent on both ligand size and recrystallization conditions. The complexes geometric structure, as well as the electronic effects of the coordination ligands, is shown both computationally as well as experimentally to affect the emission energies. Two-coordinate complexes are seen to have only weak emission at liquid nitrogen temperature (77 K), while at room temperature (298 K) the two-coordinate complexes are not observed to be luminescent. Three-coordinate complexes are observed to be luminescent at liquid nitrogen temperature as well as at room temperature. The three-coordinate complexes have a Y-shaped ground (S0) state that distorts towards a T-shape upon photoexcitation to the lowest lying phosphorescent state (T1). The geometric distortion is tunable by size of the coordinating ligand. Luminescence is controllable by limiting the amount of non-radiative emission. One manner by which non-radiative emission is …
Date:
August 2011
Creator:
Determan, John J.
System:
The UNT Digital Library
Analysis of Micro Enterprise Clusters in Developing Countries: A Case Study of Toluca, Mexico.
Businesses cluster to achieve agglomeration benefits. However, research in developing countries suggests that the economic environment limits small business’ propensity to benefit from agglomerations. The study examines the location, networking patterns, formal structures and owner characteristics of 1256 micro businesses from ten industries and thirteen sample areas in Toluca, Mexico. First, the thesis analyses whether clustering has a positive impact on the success rates of the surveyed enterprises, e.g. higher sales per employee. On an industry scale only Retail benefits from agglomerations economies. However, results of the neighborhood data show that specific areas benefit from urbanization economies. Overall, the study finds that businesses located within agglomerations, have higher levels of formalization, networking and professional training, hence constituting a more sophisticated base for economic development. Conclusions can be drawn for development policies and programs, arguing for a more differentiated approach of small business development depending on business location and cluster characteristics.
Date:
August 2011
Creator:
Drauschke, Kristin
System:
The UNT Digital Library
The Effects of a Self-Monitoring Procedure on Sustainable Behavior
Self-monitoring procedures are commonly used to assess environmentally sustainable behavior. The current experiment evaluated the effects of a self-monitoring procedure on two sustainable behaviors within a university office. A senior assistant was asked to report on light usage and energy-saver use on the copier in an office break room. Her reports were then compared with independent observations. Results showed that her reports were highly correspondent with independent observations although no change in target behaviors occurred. Changes in behavior occurred when she was asked to engage in the target behaviors. Results suggest that although self-monitoring procedures can correctly assess sustainable behaviors, they may not be suitable for behavior change.
Date:
August 2011
Creator:
Eni, Chinedu Peter
System:
The UNT Digital Library
Strong Choquet Topologies on the Closed Linear Subspaces of Banach Spaces
In the study of Banach spaces, the development of some key properties require studying topologies on the collection of closed convex subsets of the space. The subcollection of closed linear subspaces is studied under the relative slice topology, as well as a class of topologies similar thereto. It is shown that the collection of closed linear subspaces under the slice topology is homeomorphic to the collection of their respective intersections with the closed unit ball, under the natural mapping. It is further shown that this collection under any topology in the aforementioned class of similar topologies is a strong Choquet space. Finally, a collection of category results are developed since strong Choquet spaces are also Baire spaces.
Date:
August 2011
Creator:
Farmer, Matthew Ray
System:
The UNT Digital Library
Are Alzheimer's Special Care Units Really Special? Effects of Residential Status on Family Members' Perspectives on High Quality Care for their Loved-Ones in Long-Term Care
This analysis of secondary data collected from family members of nursing home residents in North Texas (n = 422) used a mixed methods approach to determine if there is a difference in perspectives on quality care among family members of Alzheimer’s/Dementia Special Care Unit (ADSCU) residents compared to those of non-ADSCU residents. Descriptive content analysis was used identify and condense responses to an open-ended question into four meaningful categories of qualities of care. An independent t-test was employed to determine if there was a difference between family members of ADSCU residents and family members of non-ADSCU residents regarding their rating of their loved-ones’ nursing home on the important qualities of care they identified from the open-ended question. Closed-ended questions were organized into indices of these qualities of care, and ordinary least square regression was employed to determine if there were significant differences between perceptions of family members of ADSCU residents and those of non-ADSCU residents regarding care their loved-ones are receiving on these qualities of care, controlling for frequency of visit.
Date:
August 2011
Creator:
Fawcett, Elizabeth Jean
System:
The UNT Digital Library
The Parent-Initiated Task Motivational Climate and Factors Influencing Eighth Grade Boys’ Intention to Continue Sports
The motivational climate, as defined by parents’ behaviors, and athletes’ goal orientations are essential in understanding children’s experiences with sport. The purpose of this study was to examine the perceived motivational climate created by parents, and its relationship to psychological outcomes experienced by adolescent male athletes in youth sports. In particular, the parent created task climate was examined through its influence on goal orientation and subsequently to psychological outcomes experienced in sport, specifically, sport competence, self-esteem, enjoyment, and intention to continue participating in sport. Participants were 405 8th grade male athletes (mean age = 13.5); (Sample A: n = 205; Sample B: n = 200). As expected, the task-oriented parent initiated motivational climate was associated with the boys’ mastery goal orientation. Participants with higher mastery goal orientation had greater sport competence, self-esteem, and more enjoyment in sport. Intention to continue playing sport was predicted primarily by their level of enjoyment, and secondarily by their increased feelings of self-esteem.
Date:
August 2011
Creator:
Force, Erica C.
System:
The UNT Digital Library
Wilderness and Everyday Life.
I challenge the dualistic view of wilderness that has influenced wilderness philosophy, politics and experience in recent years. In its place, I offer an alternative vision that recognizes wilderness areas and working landscapes as complementary elements of a larger, inhabited landscape characterized by a heterogeneous mixture of human-land relational patterns representing various points along an urban-wilderness continuum. In chapters 2 through 4, I explore the philosophical, political and experiential implications of this wilderness-in-context vision. Experienced and understood as part of the landscape we call home, wilderness may engender, renew, and sustain an engaged and integrated wilderness practice involving regular contact with wilderness places, committed activism on behalf of wild lands and their inhabitants, and grounded reflection on the meaning and value of wilderness in our everyday lives.
Date:
August 2011
Creator:
Friskics, Scott
System:
The UNT Digital Library
Risk and Resilience Faced by Children of Deployed Service Members
The purpose of this study was to examine the impact of military deployment on children, and the roles that risk and protective factors and parenting stress play in emotional symptoms and behaviors exhibited by children while their parents are deployed. A sample of 143 parents (recruited from all branches of the military) who remained at home while their spouses were deployed completed online self-report questionnaires measuring demographic and background information, child internalizing and externalizing behavior, parenting stress, child adaptability, valuing behavior, family cohesion/environment, and parenting behaviors. The sample primarily consisted of mothers (n = 141) and Caucasian individuals (n = 126), which may limit the generalizability of the findings. Results of the study suggest risk factors including parenting stress, corporal punishment, length of time a parent is deployed, and type of deployment (combat vs. non-combat) were predictive of poorer child outcomes. Protective factors including values consistent behavior, child adaptability, and family cohesion were predictive of better childhood outcomes. Parenting stress served as a mediating variable between the relationship of total risk and child outcomes, while values consistent behavior served as a mediating variable between the relationship of protective factors experienced by children and child outcomes. Military deployments not only impact …
Date:
August 2011
Creator:
Geddes, Jeffrey D.
System:
The UNT Digital Library