195 Matching Results

Results open in a new window/tab.

An Analysis of Job Satisfaction for Special Educators Who Instruct Students with Emotional/Behavioral Disorders: How Working Conditions Impact Commitment. (open access)

An Analysis of Job Satisfaction for Special Educators Who Instruct Students with Emotional/Behavioral Disorders: How Working Conditions Impact Commitment.

Teachers of students with emotional/behavioral disorders (E/BD) find that myriad concerns for effective teaching (e.g., salaries, increased paperwork, classroom management) challenge their ability to meet personal and professional needs. The push for certified teachers and limited training to work with students with special needs create stressors that can prohibit effective teaching in the workplace. Teacher moral drops and half of newly hired employees leave the profession. Equally important, student outcomes are affected. Demographic information, program practices, and commitment information from special education teachers across the country were examined in this study. These areas of study helped to determine the best indicators for teacher job satisfaction and barriers that threaten satisfactory working conditions. An online survey was designed to capture 29 areas to explore qualifications and working environments for these teachers. Of the 600 targeted teachers, 332 individuals participated in Likert-like scales to determine their degree of satisfaction or dissatisfaction for working conditions, use of intervention strategies, and areas of commitment. Closed-ended and multiple-choice questions were used. Descriptive analyses and tables aided in understanding this study. The resulting factors indicated that, although some respondents pointed to job dissatisfaction within the subset of questions, participants who worked for more than 6 years …
Date: August 2009
Creator: Adkins, Beverly
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An investigation of factors affecting Omani faculty members' adoption of information and computing technology. (open access)

An investigation of factors affecting Omani faculty members' adoption of information and computing technology.

The purpose of this study was to explore the factors influencing information and computing technology (ICT) adoption for Omani faculty members from a framework of Rogers' theory of diffusion of innovation. Three hundred Omani faculty members from Sultan Qaboos University (SQU) participated in the study. The survey consisted of five parts: (a) an 18-item questionnaire on ICT uses and skills, (b) a 1-item questionnaire on adopter category, (c) a 44-item self-constructed questionnaire on perception of barriers to adopting ICT, (d) a 50-item questionnaire on ICT attributes adapted from Moore and Benbasat, and (e) a 15-item questionnaire on demographic and job-related variables. Descriptive statistics indicated that the faculty members overall used ICT at the "Sometimes" level and had ICT skills at the "Intermediate" level. The most frequently used and skillful ICT functional areas were Website browsing, Internet search engine, and word processing. One-way ANOVAs found significant group differences of ICT uses and skills, perception of barriers, and perception of ICT attributes in the category of adopter. Early adopters used ICT more, had higher ICT skills, perceived fewer barriers in the adopting process, and recognized higher values of ICT attributes than later adopters did. Multiple regression analysis showed the level of ICT …
Date: August 2009
Creator: Al Senaidi, Said
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Kinetic studies and computational modeling of atomic chlorine reactions in the gas phase. (open access)

Kinetic studies and computational modeling of atomic chlorine reactions in the gas phase.

The gas phase reactions of atomic chlorine with hydrogen sulfide, ammonia, benzene, and ethylene are investigated using the laser flash photolysis / resonance fluorescence experimental technique. In addition, the kinetics of the reverse processes for the latter two elementary reactions are also studied experimentally. The absolute rate constants for these processes are measured over a wide range of conditions, and the results offer new accurate information about the reactivity and thermochemistry of these systems. The temperature dependences of these reactions are interpreted via the Arrhenius equation, which yields significantly negative activation energies for the reaction of the chlorine atom and hydrogen sulfide as well as for that between the phenyl radical and hydrogen chloride. Positive activation energies which are smaller than the overall endothermicity are measured for the reactions between atomic chlorine with ammonia and ethylene, which suggests that the reverse processes for these reactions also possess negative activation energies. The enthalpies of formation of the phenyl and β-chlorovinyl are assessed via the third-law method. The stability and reactivity of each reaction system is further rationalized based on potential energy surfaces, computed with high-level ab initio quantum mechanical methods and refined through the inclusion of effects which arise from the …
Date: August 2009
Creator: Alecu, Ionut M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
African-American Parents' Nutritional Habits: Implications for the Prevention of Early Childhood Obesity. (open access)

African-American Parents' Nutritional Habits: Implications for the Prevention of Early Childhood Obesity.

This research study addressed the nutritional beliefs and habits of African-American parents of children aged 3 to 6 years old. Both quantitative and qualitative data collection methods were employed. Quantitative data was collected via the Comprehensive Feeding Practices Questionnaire as well as a demographic questionnaire. Qualitative data was collected from oral interviews conducted by the researcher. Seventy-five parents or guardians participated in the study. Findings for the research questions revealed the participants' beliefs about nutrition directly correlated with food they provided for their children and most believed nutrition rather than genetics played a role in their child(ren)'s weight. Furthermore, parents from lower income families consumed more home cooked meals per week and those with higher incomes did not consume more fast food per week. Food intake restriction and control in feeding was similar among all participants, regardless of restriction and control in feeding was similar among all participants, regardless of education or income level. Suggestions for future research were included.
Date: August 2009
Creator: Anderson, Andraya D.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The War for Peace: George H. W. Bush and Palestine, 1989-1992 (open access)

The War for Peace: George H. W. Bush and Palestine, 1989-1992

The administration of President George H. W. Bush from 1989 to 1992 saw several firsts in both American foreign policy towards the Middle East, and in the Palestinian-Israeli conflict. At the beginning of the Bush Presidency, the intifada was raging in the West Bank and Gaza Strip, and by the time it was over negotiations were already in progress for the most comprehensive agreement brokered in the history of the conflict to that point, the Oslo Accords. This paper will serve two purposes. First, it will delineate the relationships between the players in the Middle East and President Bush during the first year of his presidency. It will also explore his foreign policy towards the Middle East, and argue that it was the efforts of George H. W. Bush, and his diplomatic team that enabled the signing of the historic agreement at Oslo.
Date: August 2009
Creator: Arduengo, Enrique Sebastian
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Fair balance? An analysis of the functional equivalence of risk and benefit information in prescription drug direct-to-consumer television advertising. (open access)

Fair balance? An analysis of the functional equivalence of risk and benefit information in prescription drug direct-to-consumer television advertising.

Prescription drug direct-to-consumer advertising (DTCA) has been a subject of controversy in recent years. Though government regulations require equivalent prominence of risks and benefits, there is concern about the ability of consumers with limited health literacy to fully comprehend the risks and benefits associated with drug use. Evaluating the images in DTCA is important because individuals may rely on the visual message if the wording is overly complex. Using semiotics, this study aims to evaluate whether there is functional equivalence in the presentation of risk and benefit information in prescription drug direct-to-consumer television advertising. A new analytical method is created and used to assess the consistency between the messages contained in the voice track, the primary visual images, and the superscript/ subscript text. The results indicate that risk and benefit messages in this DTCA sample lack functional equivalence. However, it is important to properly frame these findings as the study does not evaluate viewer comprehension of the various message structures.
Date: August 2009
Creator: Baird-Harris, Kay
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Always Painting the Future: Utopian Desire and the Women's Movement in Selected Works by United States Female Writers at the Turn of the Twentieth Century (open access)

Always Painting the Future: Utopian Desire and the Women's Movement in Selected Works by United States Female Writers at the Turn of the Twentieth Century

This study explores six utopias by female authors written at the turn of the twentieth century: Mary Bradley Lane's Mizora (1881), Alice Ilgenfritz Jones and Ella Merchant's Unveiling Parallel (1893), Eloise O. Richberg's Reinstern (1900), Lena J. Fry's Other Worlds (1905), Charlotte Perkins Gilman's Herland (1915), and Martha Bensley Bruère's Mildred Carver, USA (1919). While the right to vote had become the central, most important point of the movement, women were concerned with many other issues affecting their lives. Positioned within the context of the late nineteenth century women's rights movement, this study examines these "sideline" concerns of the movement such as home and gender-determined spheres, motherhood, work, marriage, independence, and self-sufficiency and relates them to the transforming character of female identity at the time. The study focuses primarily on analyzing the expression of female historical desire through utopian genre and on explicating the contradictory nature of utopian production.
Date: August 2009
Creator: Balic, Iva
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Clutch (open access)

Clutch

Clutch is the title of the creative portion of my thesis as well as the name of my theory 'clutch' which I outline in the preface section. The purpose of the clutch theory is to recognize modes of inspiration in the body, heart and mind so that the poet can consciously move beyond passive receptivity to engage inspiration more fully. Mechanically, to "clutch" does not mean to create inspiration, but it is the opportunistic, spirited encouragement of these moments of inspiration and, more importantly, the direction of the artist's own response in moving from inspiration to creation. The clutch process unfolds through three centers: body, heart and mind, where we initially encounter inspiration. And, through a discussion of three notable poets' work, Henri Cole, Li-Young Lee and T.S. Eliot, the relationship between a completed work and clutch as a process further explains the boundaries of each mode.
Date: August 2009
Creator: Bauge, Jessica M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 44, No. 15, Ed. 1 Friday, August 7, 2009 (open access)

South Texas Catholic (Corpus Christi, Tex.), Vol. 44, No. 15, Ed. 1 Friday, August 7, 2009

Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date: August 7, 2009
Creator: Beaton, Paula J.
Object Type: Newspaper
System: The Portal to Texas History
South Texas Catholic (Corpus Christi, Tex.), Vol. 44, No. 16, Ed. 1 Friday, August 21, 2009 (open access)

South Texas Catholic (Corpus Christi, Tex.), Vol. 44, No. 16, Ed. 1 Friday, August 21, 2009

Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date: August 21, 2009
Creator: Beaton, Paula J.
Object Type: Newspaper
System: The Portal to Texas History
Structural Equation Model of Variables Associated with Family Functioning among a Nationally Representative Sample of Families with a Child with Autism (open access)

Structural Equation Model of Variables Associated with Family Functioning among a Nationally Representative Sample of Families with a Child with Autism

Previous research indicates that stressors experienced by a family, the perceived level of burden assigned by the family to the stressor, and the utilization of resources predict family functioning. The current study utilized a nationally representative sample of families of children with autistic disorder to determine if previously proposed models of family functioning accurately conceptualized family functioning within a representative sample. Structural equation modeling was utilized to test the double ABCX and the linear ACBX models of family functioning. With slight modifications, the double ABCX model was supported, thus indicating that pileup of stressors, perception of burden, and utilization of resources each have unique predictive ability for family functioning, with perception of burden demonstrating the highest amount of predictive ability. Results, implications, and limitations of the study are discussed.
Date: August 2009
Creator: Bezner, Stephanie K.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
NSAID effect on prostanoids in fishes: Prostaglandin E2 levels in bluntnose minnows (Pimephales notatus) exposed to ibuprofen. (open access)

NSAID effect on prostanoids in fishes: Prostaglandin E2 levels in bluntnose minnows (Pimephales notatus) exposed to ibuprofen.

Prostanoids are oxygenated derivatives of arachidonic acid with a wide range of physiological effects in vertebrates including modulation of inflammation and innate immune responses. Nonsteroidal anti-inflammatory drugs (NSAIDs) act through inhibition of cyclooxygenase (COX) conversion of arachidonic acid to prostanoids. In order to better understand the potential of environmental NSAIDS for interruption of normal levels COX products in fishes, we developed an LC/MS/MS-based approach for tissue analysis of 7 prostanoids. Initial studies examining muscle, gut and gill demonstrated that prostaglandin E2 (PGE2) was the most abundant of the measured prostanoids in all tissues and that gill tissue had the highest and most consistent concentrations of PGE2. After short-term 48-h laboratory exposures to concentrations of 5, 25, 50 and 100 ppb ibuprofen, 50.0ppb and 100.0 ppb exposure concentrations resulted in significant reduction of gill tissue PGE2 concentration by approximately 30% and 80% respectively. The lower exposures did not result in significant reductions when compared to unexposed controls. Measured tissue concentrations of ibuprofen indicated that this NSAID had little potential for bioaccumulation (BCF 1.3) and the IC50 of ibuprofen for inhibition of PGE2 production in gill tissue was calculated to be 0.4 µM. Short-term laboratory exposure to ibuprofen did not result in …
Date: August 2009
Creator: Bhandari, Khageshor
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Comparison of Miranda Procedures: The Effects of Oral and Written Administrations on Miranda Comprehension (open access)

A Comparison of Miranda Procedures: The Effects of Oral and Written Administrations on Miranda Comprehension

Millions of custodial suspects waive their rights each year without the benefit of legal counsel. The question posed to psychologists in disputed Miranda waivers is whether this waiver decision was, knowing, intelligent, and voluntary. Mental health professionals must be aware of potential barriers to Miranda comprehension to provide expert opinions regarding a defendant's competency to waive rights. The current study examined how Miranda warning reading level, length, and method of administration affects Miranda comprehension. Recently arrested detainees at Grayson County Jail were administered oral and written Miranda warnings from the Miranda Statements Scale (MSS; Rogers, 2005) to measure their comprehension of the warnings. Surprisingly low levels of Miranda comprehension were found for most warnings. For all warnings at or above 8th grade, a substantial minority (27.1% - 39.6%) of defendants exhibited failed (i.e., < 50% understanding) Miranda comprehension. Regardless of other variables, oral administrations resulted in a substantially larger number of defendants with failed Miranda comprehension. Implications for public policy and clinical practice are discussed.
Date: August 2009
Creator: Blackwood, Hayley L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Cardio-Respiratory Ontogeny and the Transition to Bimodal Respiration in an Air Breathing Fish: Morphological and Physiological Development in Normoxia and Hypoxia. (open access)

Cardio-Respiratory Ontogeny and the Transition to Bimodal Respiration in an Air Breathing Fish: Morphological and Physiological Development in Normoxia and Hypoxia.

As selection pressures exist for not only adults, but for every life history stage, it is important to understand how environmental factors shape developing animals. Despite the significance placed on aquatic hypoxia as a driving force in the evolution of air breathing, this is the first known study to examine the effects of hypoxia on cardio-respiratory ontogeny of an air breathing fish. Blue gouramis are obligatory air breathing fish that possess a labyrinth-like structure that serves as the air breathing organ. Gouramis were reared for up to 90 d in normoxia or hypoxia, and morphological and physiological development was observed. Hypoxic larvae had increased lamellar and labyrinth organ surface areas. Bradycardia and increased gill ventilation rates were observed when larvae from either rearing group were briefly exposed to hypoxia. Hypoxic larvae also showed a reduced heart rate and gill ventilation rate in the absence of a hypoxic stimulus, possibly indicative of a more comprehensive, long-term respiratory plasticity. The similarity of routine oxygen consumption between rearing groups suggests that metabolic demand did not change for hypoxic larvae, but that they were more efficient at oxygen acquisition. This is further supported by increased resistance time of hypoxic gouramis to extreme hypoxia. The …
Date: August 2009
Creator: Blank, Tara M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Incubation humidity as an environmental stressor on the osmoregulatory developmental program of the chicken, Gallus gallus domesticus. (open access)

Incubation humidity as an environmental stressor on the osmoregulatory developmental program of the chicken, Gallus gallus domesticus.

Fetal programming results from stressors during fetal development and may influence the occurrence of disease later in life. Maternal nutritional status and/or environment can affect renal development by inducing limited nephron endowment at birth, which results in diseases such as hypertension and coronary heart disease in mammals. Birds are likely to be effective models for this process because, like mammals, they have high pressure cardiovascular systems, mammalian-type nephrons and are homeothermic. This project uses the chicken embryo to explore physiological responses of disrupted hydration state thereby providing insights into renal fetal programming. Under normal conditions the chorioallantoic membrane (CAM) and developing avian kidney work in unison to ensure a proper balance of ions and water within the egg. White leghorn chicken eggs were incubated at 37.5oC±0.5oC and either <35%, 55-60% (normal) or >85% relative humidity. Amniotic fluid serves as the drinking source for the embryo late in development; its composition is important to salt and water homeostasis. High amniotic fluid osmolality increased the blood osmolality for embryos exposed to low humidity incubation thereby indirectly influencing the renal developmental program of the embryos from this group. Indeed estimated filtering capacity was doubled in the low humidity group (6.77 ± 0.43 mm3) …
Date: August 2009
Creator: Bolin, Greta M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Effects of Professional Learning Communities on Student Achievement (open access)

The Effects of Professional Learning Communities on Student Achievement

The purpose of this study was to examine data from the Early Childhood Longitudinal Study: Kindergarten Class of 1998-99 (ECLS-K) report, identify questions and statements that correlate to the dimensions of professional learning communities (PLCs), and determine the effect PLCs have on student achievement based on the ECLS-K data. In addition, the rationale for doing this research was to measure growth in student achievement over time. A multilevel growth model was used for this research. Univariate analysis was conducted in order to reveal frequencies and percentages associated with teacher responses. Bivariate analysis was applied in order to determine the inter-correlations between the fourteen variables. Once the inter-correlations were determined from the bivariate analysis, principal component analysis was applied in order to reveal the theoretical relationship between the variables. Through the use of principal components a set of correlated variables is transformed into a set of structure coefficient: support and collaborative. Finally, a multilevel growth model was used in order to determine the effect that each variable within the support and collaborative structure coefficients had on student achievement over time. This study revealed a number of variables within the ECLS-K report that correspond to the dimensions of PLCs have a statistically …
Date: August 2009
Creator: Burdett, John M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Process of identifying a guiding theory: An exploratory study. (open access)

Process of identifying a guiding theory: An exploratory study.

At the University of North Texas, and as per the Council for Accreditation of Counseling and Related Educational Programs (CACREP) standards, masters students in counselor training are required to choose a personal theoretical approach to the counseling process. The purpose of this study was to investigate an experimental counseling theory identification procedure compared to the traditional procedure of helping students identify a personal theory of counseling. The investigation assessed the effect on 1) counselor self-report of confidence in theoretical orientation selection/identification, and 2) the degree to which a student consistently identifies, conceptualizes and utilizes a particular counseling theoretical approach. Volunteer participants (n=35) were recruited from three sections of COUN 5660 and were randomly drawn to group assignment within each class. The experimental condition focused on exploration of personal beliefs related to human nature, maladjustment and the nature of change as a basis for theory selection. The comparison group received the standard theory selection activities. The TCQ and TOPS-R were used to examine the effect of treatment and were administered at three points of time. Data was analyzed using a split plot ANOVA to examine group differences, changes across time, and the possible interaction of change with group membership. Statistical and …
Date: August 2009
Creator: Burwell-Pender, Lezlie
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Reference Model for an Open Archival Information System (OAIS) (open access)

Reference Model for an Open Archival Information System (OAIS)

This document has been approved for publication by the Management Council of the Consultative Committee for Space Data Systems (CCSDS) and represents the consensus technical agreement of the participating CCSDS Member Agencies. The procedure for review and authorization of CCSDS documents is detailed in the Procedures Manual for the Consultative Committee for Space Data Systems, and the record of Agency participation in the authorization of this document can be obtained from the CCSDS Secretariat at the address below.
Date: August 2009
Creator: CCSDS Secretariat, Space Communications and Navigation Office, 7L70, Space Operations Mission Directorate
Object Type: Book
System: The UNT Digital Library
The Impact of IT Capability on Employee Capability, Customer Value, Customer Satisfaction, and Business Performance (open access)

The Impact of IT Capability on Employee Capability, Customer Value, Customer Satisfaction, and Business Performance

This study empirically examines the impact of IT capability on firms' performance and evaluates whether firms' IT capabilities play a role in improving employee capability, customer value, customer satisfaction, and ultimately business performance. The results were based on comparing the business performance of the IT leader companies with that of control companies of similar size and industry. The IT leader companies were selected from the Information Week 500 list published annually from 2001 to 2004. For a company to be selected as IT leaders, it needed to be listed at least twice during the period. Furthermore, it had to be listed in the American Customer Satisfaction Index (ACSI) so that its customer satisfaction level could be assessed. Standard & Poor's Compustat and the ACSI scores were used to test for changes in business performance. The study found that the IT leaders had a raw material cost measured by cost-of-goods-sold to sales ratio (COGS/S) than the control companies. However, it found no evidence that firms' IT capability affects employee capability, customer value, customer satisfaction, and profit. An important implication from this study is that IT becomes a commodity and an attempt to gain a competitive advantage by overinvesting in IT may …
Date: August 2009
Creator: Chae, Ho-Chang
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Saying Sorry: Conflict Atrocity and Political Apology (open access)

Saying Sorry: Conflict Atrocity and Political Apology

This study proposes and tests a comprehensive theory detailing the motivations behind political apologies. A brief survey of the literature shows a field rich in case studies but lacking in rigorous scientific analysis. The theory presented proposes a three-level examination of political apology at the state, dyadic, and system levels and incorporates the effects of culture, conflict, and the nature of the international system into analysis. This study makes use of a new dataset recording the occurrence of political apologies for interstate conflict atrocities from 1900 to 2006. The results suggest that the existing literature, while rich, does not account for all the motivating factors behind apology. The results also confirm that political apology is a creation of the modern era and a result of the liberalization of the international system. In conclusion, paths for future research are suggested and the advent of a global "age of apology" is confirmed.
Date: August 2009
Creator: Chalkley, Marie Leone
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Parent Participation Discourse of a Community School: Diverse Ideas and Perceptions about Educational Partnership at an Inner City Community School (open access)

The Parent Participation Discourse of a Community School: Diverse Ideas and Perceptions about Educational Partnership at an Inner City Community School

Despite the widespread recommendation that schools "collaborate" with parents, little is found in the literature to elaborate on what this term or the common synonym "partnership" means, and further, how schools can invite diverse parental contributions to the table of educational discourse. The current study looks to contribute to the literature by analyzing the parent participation discourse in one community elementary school, utilizing critical discourse analysis and ethnographic observations. The findings reveal both school and parents' conceptions of the parents' partnership role as ancillary to that of the school's and the subsequent lack of true collaboration so advocated by the literature. Implications arise from this analysis which calls into question the examples of "collaboration" found in the literature, given the lack of theorizing regarding what collaboration inside of parent participation means. Contributions may shed light on the unintentional inequality of diverse parents in an effort toward true collaboration utilizing both the European American, middle class contributions of the educational institution alongside those of non-mainstream parents in creating an authentic educational atmosphere for diverse students.
Date: August 2009
Creator: Coe, Alice Elizabeth
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Francis Poulenc's Sonata for Horn, Trumpet and Trombone: A Structural Analysis Identifying Historical Significance, Form and Implications for Performance (open access)

Francis Poulenc's Sonata for Horn, Trumpet and Trombone: A Structural Analysis Identifying Historical Significance, Form and Implications for Performance

Research has been conducted on Francis Poulenc and his prominent 20th century sonata for brass instruments. Poulenc and members of the French compositional collaboration known as Les Six have all been subjects of research. Francis Poulenc's Sonata for Horn Trumpet and Trombone is a crucial piece in the development of brass chamber music during the 20th century. As one of the first works written for modern brass instruments, it demonstrates a highly crafted compositional style representative of Poulenc's early period. Research includes background and historical significance of the Sonata, analysis of form and compositional techniques, biographical information on Francis Poulenc and the members of Les Six and a section on implications for the performance of the work. This study is necessary due to the lack of research available for the piece especially considering its relevance to the development of brass chamber music. This study explores the compositional style of Francis Poulenc and his contribution to the brass ensemble repertoire.
Date: August 2009
Creator: Cord, John T.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Social Network Simulation and Mining Social Media to Advance Epidemiology (open access)

Social Network Simulation and Mining Social Media to Advance Epidemiology

Traditional Public Health decision-support can benefit from the Web and social media revolution. This dissertation presents approaches to mining social media benefiting public health epidemiology. Through discovery and analysis of trends in Influenza related blogs, a correlation to Centers for Disease Control and Prevention (CDC) influenza-like-illness patient reporting at sentinel health-care providers is verified. A second approach considers personal beliefs of vaccination in social media. A vaccine for human papillomavirus (HPV) was approved by the Food and Drug Administration in May 2006. The virus is present in nearly all cervical cancers and implicated in many throat and oral cancers. Results from automatic sentiment classification of HPV vaccination beliefs are presented which will enable more accurate prediction of the vaccine's population-level impact. Two epidemic models are introduced that embody the intimate social networks related to HPV transmission. Ultimately, aggregating these methodologies with epidemic and social network modeling facilitate effective development of strategies for targeted interventions.
Date: August 2009
Creator: Corley, Courtney David
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Growth and Characterization of β-Iron Disilicide, β-Iron Silicon Germanide, and Osmium Silicides (open access)

Growth and Characterization of β-Iron Disilicide, β-Iron Silicon Germanide, and Osmium Silicides

The semiconducting silicides offer significant potential for use in optoelectronic devices. Full implementation of the materials, however, requires the ability to tailor the energy gap and band structure to permit the synthesis of heterojunctions. One promising approach is to alloy the silicides with Ge. As part of an investigation into the synthesis of semiconducting silicide heterostructures, a series of β-Fe(Si1−xGex)2 epilayer samples, with nominal alloy content in the range 0 < x < 0.15, have been prepared by molecular beam epitaxy on Si(100). I present results of the epitaxial and crystalline quality of the films, as determined by reflection high-energy electron diffraction, Rutherford backscattering spectroscopy, and double crystal x-ray diffraction, and of the band gap dependence on the alloy composition, as determined by Fourier transform infrared spectroscopy. A reduction in band gap was observed with increasing Ge content, in agreement with previous theoretical predictions. However Ge segregation was also observed in β-Fe(Si1−xGex)2 epilayers when x > 0.04. Osmium silicide films have been grown by molecular beam epitaxy on Si(100). The silicides have been grown using e-beam evaporation sources for both Os and Si onto Si(100) substrates at varying growth rates and temperatures ranging from 600-700ºC. The resulting films have been …
Date: August 2009
Creator: Cottier, Ryan James
Object Type: Thesis or Dissertation
System: The UNT Digital Library