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open access

Development of Wireless Sensor Network System for Indoor Air Quality Monitoring

Description: This thesis describes development of low cost indoor air quality (IAQ) monitoring system for research. It describes data collection of various parameters concentration present in indoor air and sends data back to host PC for further processing. Thesis gives detailed information about hardware and software implementation of IAQ monitoring system. Also discussed are building wireless ZigBee network, creating user friendly graphical user interface (GUI) and analysis of obtained results in comparis… more
Date: December 2012
Creator: Borkar, Chirag
Partner: UNT Libraries
open access

The Invisible Dragon

Description: This collection of memoir essays chronicles the author's 19 year struggle with chronic depression. "The Invisible Dragon" explores the onset of the disease and its cure. "The Silent Typewriter" looks at how it affected the author as a writer. "Roses for Trish" discusses how it affected his wife. "My Mother's Son" explores the possibility that he inherited depression from his mother. The final essay, "The Dragon Returns" probes the author's life in 2012 with the probability that he has a persona… more
Date: December 2012
Creator: Boutwell, Nathan
Partner: UNT Libraries
open access

Spatio-temporal Variation of Nitrate Levels in Groundwater in Texas, 1970 to 2010

Description: This study looks at spatial variation of groundwater nitrate in Texas and its fluctuations at 10 year increments using data from the Texas Water Development Board. While groundwater nitrate increased in the Ogallala and Seymour aquifers across the time period, the overall rate in Texas appears to be declining as time progresses. However, the available data is limited. Findings show that a much more targeted, knowledge based strategy for sampling would not only reduce the cost of water qualit… more
Date: December 2012
Creator: Rice, Susan C.
Partner: UNT Libraries
open access

Teacher Perception of Project-Based Learning in a Technology-infused Secondary School Culture: a Critical Ciné-ethnographic Study

Description: Project-based learning has long been used in the educational realm as it emphasis a student-centered strategy which promotes meaning, enriched learning that enhances inquiry and problem-solving skills in a rich, authentic environment. The relevance and authentic design of projects may further be enhanced by the use of technology in the classroom. Technology is rapidly changing the face of American education in ways that were barely thinkable as little as five years before and provides the possi… more
Date: December 2012
Creator: Gratch, Jonathan
Partner: UNT Libraries
open access

Sibling Relationship Quality: Associations with Marital and Coparenting Subsystems

Description: Marital relationships play an important role in family functioning and in the development of sibling relationships. From a family systems perspective, other subsystems within the family, such as coparenting interactions, could explain the effects of the marital relationship on sibling bonds. Specifically, the quality of the coparenting relationship may mediate the association between marital functioning and sibling relationship quality. The current study examined relationships between these … more
Date: December 2012
Creator: Guinn, Megan D.
Partner: UNT Libraries
open access

Modest Musorgsky's Early Songs: Uncommon Lyricisms Within a Simple Framework

Description: Modest Musorgsky is considered a composer of masterful vocal, symphonic, and piano works. His songs and song cycles distinguish themselves as evocative of the broad spectrum of Russian experience. However, Musorgsky's early songs have not received as much attention as his larger works, such as Boris Godunov or Pictures at an Exhibition. Musorgsky's early songs, from 1857-1867, show the composer's affinity for lyrical expression, be it brightly melodious, impassioned, or within a comical or sati… more
Date: December 2012
Creator: Gunter, Sheila
Partner: UNT Libraries
open access

A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices

Description: The characterization of 2,3,6,7,10,11-hexabromotriphenylene, Br6TP, is presented toward its potential use as an n-type organic semiconductor and metal-free room temperature phosphor. The crystal structure shows both anisotropic two-dimensional BrBr interactions and inter-layer ?-stacking interactions. Photophysical characteristics were evaluated using solid-state photoluminescence and diffuse reflectance spectroscopies, revealing significantly red-shifted excitations in the visible region for… more
Date: December 2012
Creator: Halbert, Jason Paul
Partner: UNT Libraries
open access

Body Dissatisfaction, Disordered Eating Behaviors and Body Image Quality of Life in African American Women with Hiv

Description: The purpose of the current study was to further our understanding of the subjective experience of middle-age African American women who are HIV+ and on highly active antiretroviral therapy, particularly how self-reported lipodystrophy (LD), levels of body dissatisfaction, body image quality of life, and engagement in disordered eating behaviors are related. Multiple regression, MANOVA, MANCOVA, ANOVA, and chi-square were utilized to test hypotheses. Results revealed that HIV+ and HIV- women did… more
Date: December 2012
Creator: Hammon, Sarah A.
Partner: UNT Libraries
open access

An Investigation of Factors Influencing the User's Social Network Site Continuance Intention

Description: The social network sites (SNS) industry has recently shown an abnormal development pattern: An SNS could rapidly accumulate a large number of users, and then suffer a serious loss of users in a short time, which subsequently leads to the failure of the Web site in the highly competitive market. The user's social network site continuance is considered the most important factor for an SNS to keep its sustainable development. However, little knowledge of the user's SNS continuance raises the follo… more
Date: December 2012
Creator: Han, Bo
Partner: UNT Libraries
open access

A Collective Case Study of Veterans Inside an Arts and Crafts Room and Their Perceptions Regarding Empowerment

Description: This dissertation is "A Collective Case Study of Veterans Inside an Arts and Crafts Room and Their Perceptions Regarding Empowerment." This research examined to what degree art making, and in what ways a community of learning contributed to veterans' self-worth and empowerment through their creative activities and interactions inside an arts and crafts room at the VA hospital in Dallas, Texas. Furthermore, an essential reason for this study is to examine veterans in the arts and crafts environm… more
Date: December 2012
Creator: Hasio, Cindy Lee
Partner: UNT Libraries
open access

The Development of Algebraic Reasoning in Undergraduate Elementary Preservice Teachers

Description: Although studies of teacher preparation programs have documented positive changes in mathematical knowledge for teaching with preservice teachers in mathematics content courses, this study focused on the impact of a mathematics methods course and follow-up student teaching assignment. The presumption was that preservice teachers would show growth in their mathematical knowledge during methods since the course was structured around active participation in mathematics, research-based pedagogy, a… more
Date: December 2012
Creator: Hayata, Carole Anne
Partner: UNT Libraries
open access

Nonparametric Estimation of Receiver Operating Characteristic Surfaces Via Bernstein Polynomials

Description: Receiver operating characteristic (ROC) analysis is one of the most widely used methods in evaluating the accuracy of a classification method. It is used in many areas of decision making such as radiology, cardiology, machine learning as well as many other areas of medical sciences. The dissertation proposes a novel nonparametric estimation method of the ROC surface for the three-class classification problem via Bernstein polynomials. The… more
Date: December 2012
Creator: Herath, Dushanthi N.
Partner: UNT Libraries
open access

The Preparation of Academic Library Administrators

Description: The purpose of this quantitative study was to determine the preparation methods experienced by academic library deans and which methods they perceived to be most valuable. Rosser, Johnsrud, and Heck (2000, 2003) defined the theoretical constructs of effective academic leadership upon which this study is based. The instrument—a modified version of Greicar's (2009) Professional Preparation of Academic Deans Questionnaire—was administered online. The population was the chief administrators of acad… more
Date: December 2012
Creator: Hoffman, Starr
Partner: UNT Libraries
open access

Study of Novel Ion/surface Interactions Using Soft-landing Ion Mobility

Description: Preparative mass spectrometry is a gas-phase ion deposition technique aimed at deposition of monodisperse ion beams on a surface. This is accomplished through the implementation of a soft-landing ion mobility system which allows for high ion flux of conformationally selected ion packets. The soft-landing ion mobility system has been applied to a number of unique chemical problems including the deposition of insulators on graphene, the preparation of reusable surface enhanced Raman spectroscop… more
Date: December 2012
Creator: Hoffmann, William Darryle
Partner: UNT Libraries
open access

Educational Performance: Texas Open Enrollment Charter High Schools Compared to Traditional Public High Schools

Description: The study examined mathematics and English student achievement, attendance rates, dropout rates, and expenditures per pupil for Texas high school students in both open-enrollment charter schools and traditional public high schools for the 2009–2010 school year. All data were assembled using archived information found at the Texas Education Agency (TEA). This information included the TEA report entitled Texas Open Enrollment Charter Schools Evaluation; TEA Snapshot Yearly Report; and Academic … more
Date: December 2012
Creator: Jackson, Nokomis “Butch,” Jr.
Partner: UNT Libraries
open access

Thermochemistry Investigations Via the Correlation Consistent Composite Approach

Description: Since the development of the correlation consistent composite approach (ccCA) in 2006, ccCA has been shown to be applicable across the periodic table, producing, on average, energetic properties (e.g., ionization potentials, electron affinities, enthalpies of formation, bond dissociation energies) within 1 kcal/mol for main group compounds. This dissertation utilizes ccCA in the investigation of several chemical systems including nitrogen-containing compounds, sulfur-containing compounds, and c… more
Date: December 2012
Creator: Jorgensen, Kameron R.
Partner: UNT Libraries
open access

No Greater Error: Negotiated Agreements and Their Effects on the Conclusion of Interstate War

Description: Negotiated settlements, formal treaties to unilateral cease-fires, are often accepted to be the preferable method to end war. When negotiated agreements are used in the normal business of international politics they can be potentially helpful devices; however, when they are relied upon for a nation's security or war prevention and conclusion they can prove disastrous. It is the presence of force variables, and not the formality of an agreement which effectively concludes a war. I recategorize … more
Date: December 2012
Creator: Kendall, David F.
Partner: UNT Libraries
open access

Changes in Gene Expression Levels of the Ecf Sigma Factor Bov1605 Under Ph Shift and Oxidative Stress in the Sheep Pathogen Brucella Ovis

Description: Brucella ovis is a sexually transmitted, facultatively anaerobic, intracellular bacterial pathogen of sheep (Ovis aries) and red deer (Cervus elaphus). Brucella spp. infect primarily by penetrating the mucosa and are phagocytized by host macrophages, where survival and replication occurs. At least in some species, it has been shown that entry into stationary phase is necessary for successful infection. Brucella, like other alphaproteobacteria, lack the canonical stationary phase sigma factor ?s… more
Date: December 2012
Creator: Kiehler, Brittany Elaine
Partner: UNT Libraries
open access

An Exploratory Study of the Comprehension, Retention and Action of the Denton County Older Population in Regards to Disaster Preparedness Education

Description: The purpose of this exploratory study was to operationalize the responses from a sample of the community dwelling older population from Denton County, Texas on disaster preparedness education given by Denton County Health Department (DCHD) personnel. The goals and objectives were drawn from the Texas Public Health and Medical Emergency Management 5-Year Strategic Plan 2012-2016. It was hypothesized that after the disaster preparedness education was received, then comprehension, retention, and … more
Date: December 2012
Creator: Knight, Rebekah P.
Partner: UNT Libraries
open access

Effects of a Self-care Intervention for Counselors on Compassion Fatigue and Compassion Satisfaction

Description: This study investigated the impact of a psychoeducational and experiential structured counselor self-care curriculum, developed by Drs. Charles and Kathleen Figley, on compassion fatigue and the prevention of professional impairment as measured by the Professional Quality of Life (ProQOL), Version 5. Volunteer licensed professional counselors, supervisors, and interns from four children's advocacy centers in Texas were assigned to treatment group (n = 21; 20 females, 1 male; mean age 34.4 year… more
Date: December 2012
Creator: Koehler, Christine Marie Guthrie
Partner: UNT Libraries
open access

A Mixed-methods Study Investigating the Relationship Between Media Multitasking Orientation and Grade Point Average

Description: The intent of this study was to examine the relationship between media multitasking orientation and grade point average. The study utilized a mixed-methods approach to investigate the research questions. In the quantitative section of the study, the primary method of statistical analyses was multiple regression. The independent variables for the study were media multitasking orientation, gender, age, and income. The dependent variable for the study was grade point average. Three out of four in… more
Date: August 2012
Creator: Lee, Jennifer
Partner: UNT Libraries
open access

A Wide Band Frequency-adjustable Piezoelectric Energy Harvester: an Experimental Study

Description: Piezoelectric energy harvester has become a new powering choice for small electronic device. Due to its piezoelectric effect, electric energy can be obtained from ambient vibrations. This thesis is intending to build a frequency-adjustable piezoelectric energy harvester system. The system is structured with two piezoelectric bimorph beams, which are connected to each other by a spring. The feasibility of the frequency-adjustable piezoelectric energy harvester has been proved by investigating ef… more
Date: August 2012
Creator: Lee, Pohua
Partner: UNT Libraries
open access

Modeling Synergistic Relationships Between Words and Images

Description: Texts and images provide alternative, yet orthogonal views of the same underlying cognitive concept. By uncovering synergistic, semantic relationships that exist between words and images, I am working to develop novel techniques that can help improve tasks in natural language processing, as well as effective models for text-to-image synthesis, image retrieval, and automatic image annotation. Specifically, in my dissertation, I will explore the interoperability of features between language and v… more
Date: December 2012
Creator: Leong, Chee Wee
Partner: UNT Libraries
open access

Chronic Hypoxia and Hyperoxia Modifies Morphology and Vegf Expression of the Lungs of the Developing Chicken (Gallus Gallus Domesticus)

Description: This study determines effects of oxygen levels on morphology and VEGF expression of developing chicken lungs following incubation in normoxia (21% O2), hypoxia (15% O2) or hyperoxia (30% O2), until developmental days 16 or 18. Lung morphology was assessed using light microscopy, while VEGF expression was determined with ELISA. In hypoxia, the proportion of parabronchial tissue and parabronchi including lumina increased from day 16 to 18 (61 to 68% and 74.2 to 82.2%, respectively). Non-parabronc… more
Date: December 2012
Creator: Lewallen, Melissa Anjanette
Partner: UNT Libraries
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