Understanding the thermodynamic properties of multicomponent mixtures is of critical importance in many chemical and industrial applications. Experimental measurements become progressively difficult as the number of solution components increases -- producing the need for predictive models. Problems in development of predictive models arise if the mixture has one or more components that interact through molecular complexation or association. Experimental solubilities of anthracene and pyrene dissolved in binary systems containing one or more alcohols were measured in order to address this problem. Alcohols examined in this study were: 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol, 3-methyl-1-butanol, and 1-octanol. In binary solvent mixtures containing only a single self-associating alcoholic solvent, the alkane cosolvents studied were: n-hexane, n-heptane, n-octane, 2,2,4-trimethylpentane, cyclohexane, methylcyclohexane, tert-butylcyclohexane. Predictive solubility equations were developed using mobile order theory. This approach differs from classical solution models by representing hydrogen bonding with a probability term rather than with expressions derived from stepwise equilibria or expressions to represent hypothetical solution aggregates. Results were compared with the predicted solubilities found from using expressions developed using the Kretschmer-Wiebe and Mecke-Kempter approaches for modeling associated solutions. It was found that the mobile order approach provided reasonably accurate predictions for the solute solubilities in the systems studied. The …

Minoru Miki's first two marimba compositions, Time for Marimba (1968) and Concerto for Marimba and Orchestra (1969) were composed at a revolutionary time-period for the marimba. Due to unique and innovative compositional techniques, Miki helped establish the marimba as a true concert instrument capable of performing music of the highest quality. As a pioneer in composing for marimba literature, Miki was able to capture the true essence of the marimba; a timeless quality that has helped Time for Marimba remain a part of the standard solo repertoire for the past forty years. The purpose of this study is to analyze and compare Minoru Miki's compositions, Time for Marimba and Concerto for Marimba and Orchestra. Composed within a year of each other, these works possess similar compositional techniques, and rhythmic and thematic relationships. This thesis includes a formal analysis and detailed comparisons of compositional techniques used in both works. Performance considerations, a brief biographical sketch of Miki and historical significance of Time for Marimba and Concerto for Marimba and Orchestra are also included.

Online/offline signature schemes are useful in many situations, and two such scenarios are considered in this dissertation: bursty server authentication and embedded device authentication. In this dissertation, new techniques for online/offline signing are introduced, those are applied in a variety of ways for creating online/offline signature schemes, and five different online/offline signature schemes that are proved secure under a variety of models and assumptions are proposed. Two of the proposed five schemes have the best offline or best online performance of any currently known technique, and are particularly well-suited for the scenarios that are considered in this dissertation. To determine if the proposed schemes provide the expected practical improvements, a series of experiments were conducted comparing the proposed schemes with each other and with other state-of-the-art schemes in this area, both on a desktop class computer, and under AVR Studio, a simulation platform for an 8-bit processor that is popular for embedded systems. Under AVR Studio, the proposed SGE scheme using a typical key size for the embedded device authentication scenario, can complete the offline phase in about 24 seconds and then produce a signature (the online phase) in 15 milliseconds, which is the best offline performance of any known …

Aluminum was deposited onto both Teflon AF and Parylene AF surfaces by chemical vapor deposition of trimethylaluminum. This work shows that similar thin film (100 Angstroms) aluminum oxide adlayers form on both polymers at the low temperature dosing conditions used in the studies. Upon anneal to room temperature and above, defluorination of the polymer surfaces increased and resulted in fluorinated aluminum oxide adlayers; the adlayers were thermally stable to the highest temperatures tested (600 K). Angle-resolved spectra showed higher levels of fluorination toward the polymer/adlayer interface region. Copper films were also deposited at low temperature onto Teflon AF using a copper hexafluoroacetylacetonate-cyclooctadiene precursor. Annealing up to 600 K resulted in the loss of precursor ligands and a shift to metallic copper. As with aluminum adlayers, some polymer defluorination and resulting metal (copper) fluoride was detected. Parylene AF and polystyrene films surfaces were modified by directly dosing with water vapor passed across a hot tungsten filament. Oxygen incorporation into polystyrene occurred exclusively at aromatic carbon sites, whereas oxygen incorporation into parylene occurred in both aromatic and aliphatic sites. Oxygen x-ray photoelectron spectra of the modified polymers were comparable, indicating that similar reactions occurred. The surface oxygenation of parylene allowed enhanced reactivity …

Consisting of both theoretical and empirical inquires, this study examines the primary functions of narrative and the relationship between narrative and mental imagery. The study proposes a new framework to interpret semiotic resources. Combining this with the linguistic functional theory of Halliday (1978), a functional method to empirically investigate semiotic representations was also developed. In the empirical inquiry, the study developed a latent construct method to empirically test the effects of narrative in a real learning situation. This study is the first to investigate the functional relationship between narrative and mental imagery, and among the first to suggest a theory and empirically investigate representations of a multimodal nature. The study is also among the first to use latent constructs to investigate the learning experience in a real educational setting. Data were collected from 190 library professionals who enrolled in three sections (two in narrative and one in plain text) of an online course administered through Vista 4.0 and who completed the course and responded to several instruments. Essay data (n = 82 x 2) were analyzed using content analysis based on the narrative analysis framework developed. Quantitative data analysis methods include univariate data analysis, factor analysis, and structural equation modeling …

In the current study, I examined the general sociocultural model of eating disorders that suggests that sociocultural pressures leads to internalization, which in turn leads to body dissatisfaction and ultimately disordered eating. Because I am testing this model with a sample of African American women, I also am including acculturation as a variable of interest. Specifically, I hypothesized that (a) the experience of more societal pressure to be thin will be related to greater internalization, (b) higher levels of acculturation will be related to greater internalization, (c) internalization of the thin ideal will be directly and positively related to body image concern, and (d) body image concern will be associated with higher levels of disordered eating. It was determined that there is a direct, negative relationship between Level of Identification with Culture of Origin and Internalization. Perceived Pressure was directly and positively related to both Internalization and Body Image Concerns. Body Concerns and Internalization were both directly and positively related to Disordered Eating. These findings suggest that although many of the same constructs related to disordered eating in other ethnic groups are also related to disordered eating among African American women, the relationships between the factors differs across racial/ethnic groups. …

The purpose of this study is to explore the representation of national political freedom on web interface design by using power distance, one of the culture dimensions identified by Geert Hofstede, as a measurement. This study also aims to determine if there are any differences between government-based websites and business-oriented websites in representing national political freedom. A pilot study was conducted to validate ten power distance indicators identified from previous research on cultural dimensions with the intent of establishing a measurement for determining a country's national political freedom on web content and interface design. The result showed that six out of ten proposed indicators are valid power distance indicators. The seventh indicator, symmetric layout, demonstrated that its Web representation correlates with national political freedom level. Consequently, the principal research applied these seven indicators in coding 312 websites selected from 39 countries and analyzed national political freedom represented on these websites with content analysis method. The result of two-way analysis of variance (ANOVA) indicated that large differences exist in web interface design, which in turn reflects the aforementioned national political freedom. The research showed that the mean effect of freedom level between free-country group, partly-free-country group and not-free-country group was statistically …

Frederick Fox's contributions to contemporary music are substantial, including eighty-three compositions written between 1966 and 1998. These include pieces for orchestra, wind ensemble, choir, solo instruments, and a variety of chamber ensembles. This study serves as a complete annotated bibliography of Frederick Fox's eight compositions which feature the saxophone in a prominent role, all of which were written between 1979 and 1998. They include a piece for unaccompanied solo alto saxophone, Hear Again in Memory (1991), two works for alto saxophone and piano, Annexus (1980), and When the Thunder Speaks (1998), a saxophone duet, Visitations (1982), two saxophone quartets, 3 Diversions (1987) and The Avenging Spirit (1989), a saxophone quartet with solo alto saxophone, S.A.X. (1979), and a chamber piece for soprano and alto saxophone accompanied by piano and two percussionists, Shaking the Pumpkin (1986). In addition, an analysis of Fox's first composition for saxophone, S.A.X. for Solo Alto Saxophone and Saxophone Quartet, offers an insight into the compositional style of the composer. A complete listing of all of Fox's compositions, formal schemata of selected saxophone compositions, and a discography of his recorded saxophone compositions are included as appendices.

In this study I analyzed the 1089 desegregation outcomes in federal district courts that occurred between 1994 and 2004 in order to identify a) the legal and non-legal factors in the litigation process that predict pro-desegregation outcomes and b) the judicial patterns that impact the future of desegregation policy. Twenty-one legal and non-legal variables were analyzed via logistic regression analysis to identify factors that predict pro-desegregation outcomes. Only three predictor variables were statistically significant: Government Litigants; Region 3 (West) and Region 4 (Northeast.) Descriptive analyses of the data identified two trends in the pattern of litigation: The percentage of defendant wins increased after 1991 at a lesser rate than has been previously reported. I conclude that based on the results of both the quantitative and qualitative analyses the federal district courts are not a barrier to desegregation and can still be a part of a comprehensive desegregation strategy.

This qualitative study uses narrative analysis to explore the outcomes of information seeking and use among public library users. Twelve women between the ages of 51 and 72, all residents of Fayetteville, Arkansas who self-identified as regular library users, were interviewed to gather their life stories and their experiences using the public library. The participants in this study used information to enable learning and, often, a change in their affective state. The participants used the new information they encountered constructively, to engage with the knowledge and experience they possessed; this use of information always involved reflection, dialogue, or both. The outcomes from these actions are the creation of new knowledge, a change in the participants' meaning schemes, and/or an affective change. In addition, the narratives strongly suggest that information seeking and use by adults in public libraries can sometimes facilitate or, on its own, precipitate a perspective transformation and the adoption of new meanings. Overall, the findings support Mezirow's theory of transformative learning as a model for understanding information use and outcomes among users of the public library. The major implications of this study are two-fold. One, it introduces to information science Mezirow's theory of transformative learning which could provide …

The purpose of the study was to determine the relationship between scores of the new teachers' classroom effectiveness with numerical indexes of mentor support, mentor infrastructure, and workplace ecology. In addition, this study sought to determine the effect of various demographics (i.e., gender, age, race, degree, teaching level, and certification route) on the Classroom Effectiveness Index (CEI) scores of first-year teachers, and to determine the differences, if any, between the Classroom Effectiveness Index scores of first-year teachers who remained on campus, switched campuses, or left the district. This study is primarily correlational in nature - looking for relationships between quantifiable variables. The subjects are 68 first-year teachers. The mandatory mentoring program the subjects were involved in consisted of a paid, veteran teacher who worked on the same campus as the first-year teacher and assisted in instructional or behavioral needs. This study measured the impact of the first-year teachers' mentoring experiences to the Classroom Effectiveness Index scores and teacher retention. The findings suggest that the Classroom Effectiveness Index scores might not be an appropriate tool for uncovering which aspects of mentoring contribute to student achievement and retention. Adding the value-added measurement tool to the categories of mentor support (MS), mentor infrastructure …

Diabetes is a disease with a deleterious pathology that currently impacts 4.5 million individuals within the United States. This study examined the ability of a specific neuropsychological battery to identify and classify dementia type, investigated the impact of diabetes on cognition and analyzed the ability of the memory measures of the 7 Minute Screen (7MS) and the Rey-Osterrieth Recall to correctly categorize dementia type when not used in combination with a full battery. The battery in addition to exhaustive patient history, medical chart review and pertinent tests were used in initial diagnosis. Results indicated the battery was sufficient in the identification and classification of dementia type. Within the sample, diabetes did not appear to significantly impact overall battery results whereby only two measures were minimally affected by diabetes. Finally, the memory measures of the 7MS and the Rey-Osterrieth Recall were sufficient to predict membership into the Alzheimer's (AD) and vascular dementia (VD) groups with 86.4% accuracy. The classification percentage dropped to 68.3% with addition of the mild cognitive impairment category. The full battery correctly classified AD and VD dementia 87.5% and appeared to be the most robust.

Living neural networks are capable of processing information much faster than a modern computer, despite running at significantly lower clock speeds. Therefore, understanding the mechanisms neural networks utilize is an issue of substantial importance. Neuronal interaction dynamics were studied using histiotypic networks growing on microelectrode arrays in vitro. Hierarchical relationships were explored using bursting (when many neurons fire in a short time frame) dynamics, pairwise neuronal activation, and information theoretic measures. Together, these methods reveal that global network activity results from ignition by a small group of burst leader neurons, which form a primary circuit that is responsible for initiating most network-wide burst events. Phase delays between leaders and followers reveal information about the nature of the connection between the two. Physical distance from a burst leader appears to be an important factor in follower response dynamics. Information theory reveals that mutual information between neuronal pairs is also a function of physical distance. Activation relationships in developing networks were studied and plating density was found to play an important role in network connectivity development. These measures provide unique views of network connectivity and hierarchical relationship in vitro which should be included in biologically meaningful models of neural networks.

The soil-nematode Caenorhabditis elegans survives oxygen deprivation (anoxia < 0.001 kPa of O2, 0% O2) by entering into a state of suspended animation during which cell cycle progression at interphase, prophase and metaphase stage of mitosis is arrested. I conducted cell biological characterization of embryos exposed to various anoxia exposure times, to demonstrate the requirement and functional role of spindle checkpoint gene san-1 during brief anoxia exposure. I conducted a synthetic lethal screen, which has identified genetic interactions between san-1, other spindle checkpoint genes, and the kinetochore gene hcp-1. Furthermore, I investigated the genetic and cellular mechanisms involved in anoxia-induced prophase arrest, a hallmark of which includes chromosomes docked at the nuclear membrane. First, I conducted in vivo analysis of embryos carried inside the uterus of an adult and exposed to anoxic conditions. These studies demonstrated that anoxia exposure prevents nuclear envelope breakdown (NEBD) in prophase blastomeres. Second, I exposed C. elegans embryos to other conditions of mitotic stress such as microtubule depolymerizing agent nocodazole and mitochondrial inhibitor sodium azide. Results demonstrate that NEBD and chromosome docking are independent of microtubule function. Additionally, unlike anoxia, exposure to sodium azide causes chromosome docking in prophase blastomeres but severely affects embryonic viability. …

The purposes of this study were to describe the characteristics of the changing male voice in 4th, 5th and 6th grade students using Cooksey's maturation stages and, to compare the age-of-onset of the male voice change in African American, White, and Hispanic male students. Participants included volunteer 4th (n = 61), 5th (n = 73), and 6th grade male students (n = 63) from 2 urban elementary schools, 5 suburban elementary schools, 1 suburban middle school and 1 urban middle school in the North Texas region. The three ethnic groups represented in this study were: African American (n = 62), White (n = 58), and Hispanic (n = 77). Results indicated that approximately 46% of 4th grade participants, 62% of 5th grade participants, and 67% of 6th grade participants were classified as changing voices. A descriptively larger percentage of African American participants were classified as changing voices than Hispanic and White participants. Also, a larger percentage of African American and Hispanic participants were descriptively classified in the more advanced stages of the voice change than White participants. Urban African American, White, and Hispanic participants had a larger percentage of males classified as changing voices than suburban African American, White, and …

The Rey-Osterrieth Complex Figure Task (ROCFT) has been a standard in neuropsychological assessment for six decades. Many researchers have contributed administration procedures, additional scoring systems and normative data to improve its utility. Despite the abundance of research, the original 36-point scoring system still reigns among clinicians despite documented problems with ceiling and floor effects and poor discrimination between levels of impairment. This study is an attempt to provide a new method based upon item response theory that will allow clinicians to better describe the impairment levels of their patients. Through estimation of item characteristic curves, underlying traits can be estimated while taking into account varying levels of difficulty and discrimination within the set of individual items. The ultimate goal of the current research is identification of a subset of ROCFT items that can be examined in addition to total scores to provide an extra level of information for clinicians, particularly when they are faced with a need to discriminate severely and mildly impaired patients.

This dissertation examines possible differences in media habits and tastes between Christians and non-Christians. The study utilizes data from singles Internet personal advertisements to determine whether or not Christians, especially those with high levels of religiosity or who may be part of the Christian Right, have different television viewing patterns. Three models were developed using multivariate data analysis and logistic regression to examine Christians' television viewing habits regarding reality shows, soap operas, and news. The first model looks at the viewing habits of Christians, the second model examines the viewing habits of Christians attending religious services at least monthly, and the third model analyzes the viewing habits of Christians attending religious services at least monthly and having conservative political views. No significant differences were found in viewing habits between Christians and non-Christians for any of the three models. Although the results of this study cannot be generalized to Christians as a whole, they suggest that Christians in this sample might have adopted secular practices with regard to their television viewing habits.

The weight loss industry has come under fire from the Federal Trade Commission (FTC) in recent years due to consumer claims that many firms, marketing weight loss products, are using advertisements in an attempt to deceive consumers. Illegitimate weight loss claims have created so much concern that a White Paper call-to-action to investigate misleading weight loss advertisements has been filed. Despite recent interest, little attention has been garnered concerning the understanding of why consumers respond to potentially misleading weight loss claims. Intuitively, an understanding of why consumers fall prey to weight loss claims may aid academics, practitioners, and policy makers as they make important decisions relative to the weight loss industry and its practices. This study fills that void by applying a theory of visceral influences (TVI) to the context of weight loss advertising. Loewenstein's TVI was developed to aid in explaining why consumers make decisions contrary to their long-term self-interest. Visceral influences are drive states that have a direct hedonic impact, have an effect on the relative desirability of various goods and activities, and consequently, have a strong influence over the decisions consumers make. Common visceral cues (cues associated with any reward linked to a visceral factor) include proximity …

This study investigated the effects of interactive lessons and learning style on student learning outcomes in self-defense education classes. The study utilized an experimental design that incorporated four self-defense education classes at the University of North Texas (UNT) during the fall semester 2007 (N = 87). A pre-test was administered during the first week of class to determine prior knowledge of the participants. The Visual Auditory Reading/Kinesthetic Inventory (VARK) was used to assess the learning styles of the students and was completed after the pre-test of knowledge was administered. The treatment group received the interactive lesson and the control received a paper review. The difference between the pre and posttest was used as a measure of improvement of the student's learning outcomes. A 2 (treatment/control) by 2 (pretest/posttest) ANOVA with repeated measures was conducted to examine the differential improvement in knowledge across the intervention. Based on the 2-way ANOVA there was a significant difference between the treatment group and the control group based on their learning outcomes. A repeated measures ANOVA was conducted to determine if there was a significant difference between the groups based on the pre and post test scores. Based on the results of a one week …

Renewal theory began development in the early 1940s, as the need for it in the industrial engineering sub-discipline operations research had risen. In time, the theory found applications in many stochastic processes. In this thesis I investigated the effect of seasonal effects on Poisson and non-Poisson renewal processes in the form of perturbations. It was determined that the statistical analysis methods developed at UNT Center for Nonlinear Science can be used to detect the effects of seasonality on the data obtained from Poisson/non-Poisson renewal systems. It is proved that a perturbed Poisson process can serve as a paradigmatic model for a case where seasonality is correlated to the noise and that diffusion entropy method can be utilized in revealing this relation. A renewal model making a connection with the stochastic resonance phenomena is used to analyze a previous neurological experiment, and it was shown that under the effect of a nonlinear perturbation, a non-Poisson system statistics may make a transition and end up in the of Poisson basin of statistics. I determine that nonlinear perturbation of the power index for a complex system will lead to a change in the complexity characteristics of the system, i.e., the system will reach …

This qualitative action research study examines how critical theory defined and guided my practice as an art teacher educator while I provided inclusion training for seven preservice art teachers during their student teaching. Sources of data included a personal journal, the inclusion curriculum I created for the preservice teachers and questionnaires and interviews. Primary findings indicated that critical theory had a substantive impact on the evolving development of my teaching philosophy, in particular my attention to issues of power redistribution in the classroom and my developing notion of teaching as form of artistry. The findings of this study also indicate that the primary impact of critical theory upon the preservice teachers was the articulation of their personal narratives and its relation to the development of their teaching identities. Further, mentoring these preservice art teachers in critical theory increased their competence in solving educational dilemmas. A primary finding of this study was how significant of a role the supervising or mentor teacher plays in developing preservice teachers' identity. As this is acknowledged, valued and utilized, more collaborative relationships among these stakeholders in the education of the preservice art teacher can be forged. The study provides implications for art teacher educators as …

The purpose of this study was to investigate the relationship between a principal's emotional intelligence and personality and his or her ability to implement and develop professional learning communities within the school. The Professional Learning Community Assessment (PLCA) was administered to principals and teachers in 13 schools in Texas ranging from elementary to high school. Based on the strength of the PLCA scores, two elementary schools were selected to participate in case study research. The principals of these two campuses were administered an emotional intelligence instrument (MSCEIT), a personality instrument (DiSC), and were interviewed along with three of their teachers. The findings indicate that both of these principals scored high in the Influential and Conscientiousness subscales and low in the Dominance subscale. The principals also possessed either near-average or above-average emotional intelligence with both principals scoring particularly strong in the Strategic subscale.

When expenses become an issue, training is often one of the first budget items to be cut. There have been a number of evaluation studies about rates of return from training interventions. Most results are based on interviewing participants about the value of the intervention and its effect on their productivity. This often results in quadruple digit return on investment indications. Decision makers who control the budget often view these kinds of results with skepticism. This study proposes a methodology to evaluate training interventions without asking participants their opinions. The process involves measuring learning through a series of pre-tests and post-tests and determining if scores on pre-tests can be used as predictors of future return on investment results. The study evaluates a series of return on investment scores using analysis of variance to determine the relationship between pre-tests and final return on investment results for each participant. Data is also collected and evaluated to determine if the financial results of the organization during the period of the training intervention could be correlated to the results of the training intervention. The results of the study suggest that the proposed methodology can be used to predict future return on investment from training …

By conducting this theory-based empirical study, gathering data from working negotiators in the US and Canada, I have determined what primary dynamic activities, communication skills, and negotiation tools are used by hostage/crisis negotiators. Negotiators implement their negotiation and decision strategies differently depending on whether the situations they deal with are instrumental or expressive. I have determined which elements of negotiations and factors affecting negotiations differ while handling instrumental and expressive hostage situations. I found that the collected data did not reveal any significant relationship between handling instrumental/expressive hostage situations differently and belief in the elements of Brenda Dervin's and Shannon-Weaver's theories. I have also determined that the belief in the elements of the Dervin's and Shannon-Weaver's theories is workable and practical for negotiators to use. Based on the above findings, the model suggested by this research adds the elements and directives of Dervin's and Shannon-Weaver's models to the common approach used by the negotiators. This revised model suggests that the negotiators pay attention to the dynamics of the interactions presented between the two parties: the negotiators themselves and hostage takers. The revised model also recommends that the negotiators focus on not only the hostage takers behavioral characteristics, psychological conditions, and …