UNT Theses and Dissertations - Browse

ABOUT BROWSE FEED

Aesthetic Models and Structural Features in Concerto for Solo Percussion and Concert Band

Description: Concerto for Solo Percussion and Concert Band was commissioned by Staff Sergeant Rone Sparrow, a percussionist with the West Point Military Academy Band. Funding for the project was provided by the Barlow Foundation. The piece was premiered April 13, 2005 in the Eisenhower Hall Theater at West Point, New York. Rone Sparrow performed with the USMA band, and Colonel Thomas Rotondi Jr., Commander/Conductor, conducted the piece. The concerto consists of three movements, and each movement features a different instrument: the first features marimba, the second, vibraphone, and the third movement features the drum kit together with a rhythm section (piano, bass, and drums). In addition to the piece, the dissertation paper discusses important technical detail related to the piece, including: harmony, form, rhythm, programmatic ideas as they relate to motivic strands, and the process of generating and discarding material. The paper also focuses on a number of factors that were influential to the piece, such as postmodern philosophy.
Date: December 2005
Creator: Anderson, Stephen Reg
Partner: UNT Libraries

Analysis of the One-Horned Rhinoceros (Rhinoceros Unicornis) Habitat in the Royal Chitwan National Park, Nepal.

Description: This study analyzes the remaining suitable habitat of the one-horned rhinoceros, Rhinoceros unicornis, in Royal Chitwan National Park of Nepal. An April 2003 Landsat image was classified into eight land cover types: wetland, sand, water, mixed forest, sal forest, agriculture, settlement, and grassland. This image was converted into habitat suitability maps using cover, food, and water. The rhinoceros prefers grassland habitat with oxbow lakes and closed canopy during the monsoon season. Nominal values of five parameters were used to create a map of habitat suitability index. The map was categorized into four habitat classes: highly unsuitable, unsuitable, moderately suitable habitat, and suitable. Landscape metrics, patch metrics and class metrics associated with habitat were determined through the use of FRAGSTATS.
Date: December 2005
Creator: Thapa, Vivek
Partner: UNT Libraries

An Analysis of the Perception of the Degree of Compliance of Selected Texas Public High Schools with Title IX of the Education Amendments of 1972

Description: In recent years, few laws have had greater impact on public education than Title IX of the Education Amendments of 1972. As a result of this legislation, participation levels of female athletes have risen dramatically. Conducted in the Texas Education Agency's Region XI, this study sought to ascertain the perceptions of high school principals, the lead coaches of male athletes, and the lead coaches of female athletes with regard to their schools' compliance with the components of Title IX. The study centered on the results of a survey instrument that included twenty Likert-scale questions as well as several demographic questions. The research questions sought to determine: (1) respondents' overall perception of compliance; (2) any differences in perceptions of compliance based upon the role of the individual; (3) any differences in perceptions based upon the percentage of students qualifying for free and reduced lunch; (4) any differences based upon the state classification of the schools; (5) any differences based upon the gender of respondents; (6) whether complaints filed via OCR result in a perception of increased compliance; and (7) the program component areas in which respondents view their schools to be most compliant. Descriptive and causal-comparative methods were used to analyze the data. The results revealed that school leaders in north central Texas public high schools perceived a high degree of compliance of their schools with the requirements of Title IX regardless of their role. A descriptive analysis of the responses based upon respondent role yielded slight differences between coaches of males and females. An ANOVA of responses considering the variables of free and reduced lunch as well as state classification did not yield a statistical significance in terms of perceptions of compliance. Although the mean scores of female respondents were slightly lower than males, the research did not yield statistically ...
Date: December 2005
Creator: Hollingsworth, Jerry Don
Partner: UNT Libraries

An Annotated Bibliography of Selected Repertoire for Alto Saxophone and Piano for Developing College-Level Alto Saxophonists, with an Analysis of Yvon Bourrel's Sonate Pour Alto Saxophone Et Piano

Description: In this study the author addresses the problem of finding quality repertoire for young college-level saxophonists. By examining graded repertoire lists from a variety of college and university saxophone instructors, the author has compiled a list of 180 works for alto saxophone and piano. Twenty-four well-known works of a difficulty-level appropriate for freshman and sophomore players are identified and annotated. Each annotation consists of bibliographical information, a biographical sketch of the composer, a difficulty rating of eight elements of performance, a discussion of performance considerations, and a bibliography of available recordings. The eight elements of performance included in the difficulty rating are: Meter, key signatures, tempo, note-values, rhythm, articulation, range, and dynamic levels. Each of these facets is graded using a six-point difficulty scale. One work from the select list, Yvon Bourrel's Sonate Pour Saxophone Alto et Piano, has been analyzed in greater detail with regard to thematic material and key areas to provide in-depth information that, hopefully, will help the student gain a deeper understanding of that work and as a result perform the piece with greater artistry.
Date: December 2005
Creator: Kallestad, Scott D.
Partner: UNT Libraries

Applications in Fixed Point Theory

Description: Banach's contraction principle is probably one of the most important theorems in fixed point theory. It has been used to develop much of the rest of fixed point theory. Another key result in the field is a theorem due to Browder, Göhde, and Kirk involving Hilbert spaces and nonexpansive mappings. Several applications of Banach's contraction principle are made. Some of these applications involve obtaining new metrics on a space, forcing a continuous map to have a fixed point, and using conditions on the boundary of a closed ball in a Banach space to obtain a fixed point. Finally, a development of the theorem due to Browder et al. is given with Hilbert spaces replaced by uniformly convex Banach spaces.
Date: December 2005
Creator: Farmer, Matthew Ray
Partner: UNT Libraries

Art Criticism and the Gendering of Lee Bontecou's Art, ca. 1959 - 1964

Description: This thesis identifies and analyzes gendering in the art writing devoted to Lee Bontecou's metal and canvas sculptures made from the 1959 - 1964. Through a careful reading of reviews and articles written about Bontecou's constructions, this thesis reconstructs the context of the art world in the United States at mid-century and investigates how cultural expectations regarding gender directed the reception of Bontecou's art, beginning in 1959 and continuing through mid-1960s. Incorporating a description of the contemporaneous cultural context with description of the constructions and an analysis of examples of primary writing, the thesis chronologically follows the evolution of a tendency in art writing to associate gender-specific motivation and interpretation to one recurring feature of Bontecou's works.
Access: This item is restricted to the UNT Community Members at a UNT Libraries Location.
Date: December 2005
Creator: Estrada-Berg, Victoria
Partner: UNT Libraries

Assessing the Potential Effects of Climate Variability on Reservoir Water Volume in North-Central Texas Using GIS and Models: A Case Study of Ray Roberts Lake.

Description: Assessing the impact of climate variability on water resources is one of the difficult tasks in planning the future growth of North-Central Texas. This study defined twelve extreme climate scenarios. Data from each scenario was input to a hydrological model (HEC-HMS) to calculate watershed runoff to Lake Ray Roberts. Model parameters are determined using Geographic Information System (GIS). The water balance was calculated for current and future water demand and resulting change in the volume and level of this reservoir. The results indicate certain climate scenarios decrease in volume. Thus, local governments should plan alternative water management strategies during droughts.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2005
Creator: Osei-Adjei, Peter
Partner: UNT Libraries

Attrition in Longitudinal Studies Using Older Adults: A Meta-Analysis

Description: Longitudinal methods have become an improved and essential means of measuring intra-individual change over time. Yet one of the greatest and most hazardous drawbacks studying participants over multiple sessions can be the loss of participants over time. This study attempts to illuminate the problem of attrition in longitudinal research by estimating the mean effect sizes for participant loss across 57 studies published in 13 prestigious journals which regularly use older participants. Results estimate overall attrition to be around 34% of the original sample. The subsequent break down of attrition into its subtypes yield mean effect sizes for attrition due to Refusal (8%), Loss of contact (10%), Illness (6%), and Death (14%) in studies sampling from adults 50 years or older. Analyses were then conducted via meta-analytic one-way ANOVA and weighted regression to identify possible moderators of overall attrition and their four subtypes.
Date: December 2005
Creator: Rhodes, Anthony Ryan
Partner: UNT Libraries

Automated Defense Against Worm Propagation.

Description: Worms have caused significant destruction over the last few years. Network security elements such as firewalls, IDS, etc have been ineffective against worms. Some worms are so fast that a manual intervention is not possible. This brings in the need for a stronger security architecture which can automatically react to stop worm propagation. The method has to be signature independent so that it can stop new worms. In this thesis, an automated defense system (ADS) is developed to automate defense against worms and contain the worm to a level where manual intervention is possible. This is accomplished with a two level architecture with feedback at each level. The inner loop is based on control system theory and uses the properties of PID (proportional, integral and differential controller). The outer loop works at the network level and stops the worm to reach its spread saturation point. In our lab setup, we verified that with only inner loop active the worm was delayed, and with both loops active we were able to restrict the propagation to 10% of the targeted hosts. One concern for deployment of a worm containment mechanism was degradation of throughput for legitimate traffic. We found that with proper intelligent algorithm we can minimize the degradation to an acceptable level.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2005
Creator: Patwardhan, Sudeep
Partner: UNT Libraries

Bach's Mass in B minor: An Analytical Study of Parody Movements and their Function in the Large-Scale Architectural Design of the Mass

Description: Most studies of the Mass in B Minor deal with the history of the work, its reception history, primary sources, performance practice issues, rhetoric, and even theological and numerical symbolism. However, little research focuses on an in-depth analysis of the music itself. Of the few analytical studies undertaken, to date only a limited number attempt to explain Bach's use of parody technique or unity in the whole composition. This thesis focuses on understanding three primary concerns in regards to the Mass in B minor: to comprehend how preexistent material was adapted to the context of the Mass, how this material functions in the network of the entire composition, and how unity is achieved by means of large-scale voice leading. The results of this study not only provide new information about this monument of Western music, but also provide insight to the deep sense of large-scale structure in Bach's work.
Date: December 2005
Creator: Pérez Torres, René
Partner: UNT Libraries

Baptists and Britons: Particular Baptist Ministers in England and British Identity in the 1790s

Description: This study examines the interaction between religious and national affiliations within a Dissenting denomination. Linda Colley and Jonathan Clark argue that religion provided the unifying foundation of national identity. Colley portrays a Protestant British identity defined in opposition to Catholic France. Clark favors an English identity, based upon an Anglican intellectual hegemony, against which only the heterodox could effectively offer criticism. Studying the Baptists helps test those two approaches. Although Methodists and Baptists shared evangelical concerns, the Methodists remained within the Church of England. Though Baptists often held political views similar to the Unitarians, they retained their orthodoxy. Thus, the Baptists present an opportunity to explore the position of orthodox Dissenters within the nation. The Baptists separated their religious and national identities. An individual could be both a Christian and a Briton, but one attachment did not imply the other. If the two conflicted, religion took precedent. An examination of individual ministers, specifically William Winterbotham, Robert Hall, Mark Wilks, Joseph Kinghorn, and David Kinghorn, reveals a range of Baptist views from harsh criticism of to support for the government. It also shows Baptist disagreement on whether faith should encourage political involvement and on the value of the French Revolution. Baptists did not rely on religion as the source of their political opinions. They tended to embrace a concept of natural rights, and their national identity stemmed largely from the English constitutional heritage. Within that context, Baptists desired full citizenship in the nation. They called for the repeal of the Test and Corporation Acts and the reform of Parliament. Because of their criticism of church and state, Baptists demonstrate the diversity within British Protestantism. For the most part, religion did not contribute to their national identity. In fact, it helped distinguish them from other Britons. Baptist evangelicalism reinforced that separate identity, ...
Date: December 2005
Creator: Parnell, John Robert
Partner: UNT Libraries

Capacity and Throughput Optimization in Multi-cell 3G WCDMA Networks

Description: User modeling enables in the computation of the traffic density in a cellular network, which can be used to optimize the placement of base stations and radio network controllers as well as to analyze the performance of resource management algorithms towards meeting the final goal: the calculation and maximization of network capacity and throughput for different data rate services. An analytical model is presented for approximating the user distributions in multi-cell third generation wideband code division multiple access (WCDMA) networks using 2-dimensional Gaussian distributions by determining the means and the standard deviations of the distributions for every cell. This model allows for the calculation of the inter-cell interference and the reverse-link capacity of the network. An analytical model for optimizing capacity in multi-cell WCDMA networks is presented. Capacity is optimized for different spreading factors and for perfect and imperfect power control. Numerical results show that the SIR threshold for the received signals is decreased by 0.5 to 1.5 dB due to the imperfect power control. The results also show that the determined parameters of the 2-dimensional Gaussian model match well with traditional methods for modeling user distribution. A call admission control algorithm is designed that maximizes the throughput in multi-cell WCDMA networks. Numerical results are presented for different spreading factors and for several mobility scenarios. Our methods of optimizing capacity and throughput are computationally efficient, accurate, and can be implemented in large WCDMA networks.
Date: December 2005
Creator: Nguyen, Son
Partner: UNT Libraries

Career Paths to the Texas Public School Superintendency

Description: This study focused on the identification of career paths that led to the Texas public school superintendency, including an examination of career path differences associated with gender, ethnicity, and district type, and on the identification of the career path positions superintendents perceived as being the most beneficial in preparing them for the superintendency. Additionally, the study examined place-bound versus career-bound superintendents. The most common career path to the Texas public school superintendency was secondary teacher, secondary principal, and superintendent. Female administrators and administrators who worked in large districts were more likely to take the director route to the superintendency. Additionally, most major urban superintendents took the director route to the superintendency. Ethnicity was not a significant factor in determining the career path to the superintendency. A significant correlation did exist between educational attainment and the secondary teacher, secondary assistant principal, secondary principal, assistant superintendent, superintendent career path. A higher representation of superintendent respondents who held earned doctorates existed in that career path than in any of the other career path groups. While educational attainment was important in higher paying districts, most Texas superintendents did not hold doctorates. Few held doctorates from the most prestigious, nationally recognized universities.
Date: December 2005
Creator: Farmer, Tod Allen
Partner: UNT Libraries

Change of Condition: Women's Rhetorical Strategies on Marriage, 1710-1756

Description: This dissertation examines ways in which women constructed and criticized matrimony both before and after their own marriages. Social historians have argued for the rise of companionacy in the eighteenth century without paying attention to women's accounts of the fears and uncertainties surrounding the prospect of marriage. I argue that having more latitude to choose a husband did not diminish the enormous impact that the choice would have on the rest of a woman's life; if anything, choice might increase that impact. Lady Mary Wortley Montagu, Hester Mulso Chapone, Mary Delany, and Eliza Haywood recorded their anxieties about and their criticisms of marriage in public and private writings from the early years of the century into the 1750s. They often elide their own complex backgrounds in favor of generalized policy statements on what constitutes a good marriage. These women promote an ideal of marriage based on respect and similarity of character, suggesting that friendship is more honest, and durable than romantic love. This definition of ideal marriage enables these women to argue for more egalitarian marital relationships without overtly calling for a change in the wife's traditional role. The advancement of this ideal of companionacy gave women a means of promoting gender equality in marriage at a time when they considered marriage risky but socially and economically necessary.
Date: December 2005
Creator: Wood, Laura Thomason
Partner: UNT Libraries

Characteristics of Successful Texas Schools Which Predict Components of an Adequate Education.

Description: The purpose of this study was to identify high performing school districts in Texas and to determine if there are different characteristics leading to the provision of an adequate education in high performing districts as compared to low performing districts. It specifically sought to determine which characteristics contributed most to an adequate education and used data from the Texas Academic Excellence Indicator System (AEIS) which chronicled scores on the Texas Assessment of Academic Skills (TAAS). The population for this study consisted of all 2001-2002 Texas public school districts with the exception of charter schools, special-purpose statutory districts, and state-administered districts, which resulted in using data from 1027 Texas school districts. Descriptive discriminant analysis was chosen as the method for statistical analysis. Data were obtained from the Texas Education Agency (TEA). Adequate and inadequate districts were analyzed according to eight variables. They were (1) taxable value per pupil, (2) the percentage of special education students, (3) the percentage of students coded as bilingual and ESL, (4) pupil-teacher ratio, (5) the size of the district, (6) the percentage of economically disadvantaged students in the district, (7) the district community type, such as rural or suburban, and (8) the total operating expenditures per pupil. Two analyses were conducted. The first analysis sought to determine the different characteristics between adequate districts (districts that scored 80% or above on the TAAS test) and inadequate districts (districts that scored 79% or below on the TAAS test). In order to determine these differences with a higher standard for adequacy, a second analysis was performed. The second analysis focused on districts deemed adequate by scoring 90% or above on the TAAS test compared to those districts deemed inadequate by scoring 69% and below. The eight variables accounted for 21% and 37% of the variance between groups respectively. For ...
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2005
Creator: Ryan, Robin S.
Partner: UNT Libraries

Children, Adolescents, and English Witchcraft

Description: One area of history that historians have ignored is that of children and their relationship to witchcraft and the witch trials. This thesis begins with a survey of historical done on the general theme of childhood, and moves on to review secondary literature about children and the continental witch trials. The thesis also reviews demonological theory relating to children and the roles children played in the minds of continental and English demonologists. Children played various roles: murder victims, victims of dedication to Satan, child-witches, witnesses for the prosecution, victims of bewitchment or possession, and victims of seduction into witchcraft. The final section of the thesis deals with children and English witchcraft. In England children tended to play the same roles as described by the demonologists.
Date: December 2005
Creator: Martin, Lisa A.
Partner: UNT Libraries

Collaboration for Organization Success: Linking Organization Support of Collaboration and Organization Effectiveness.

Description: What does it take for organizations to support people working together effectively? What does it mean for an organization to be effective? Does successful collaboration lead to more effective organizations? This study explored these questions both theoretically and empirically in an effort to help organizations understand the most important aspects to consider when attempting to achieve collaboration for organization success. The purpose of this study was to fill some of the gaps in the research by taking a broad, holistic approach to exploring the context required to support collaboration at levels of organizations broader than the team and exploring the links between organization support of collaboration and organization effectiveness. In preparation for the current study, the Organization Support of Collaboration model was developed to identify the broad organization design elements that are required to support collaboration. The Organization Effectiveness model was created to provide a holistic view of what it takes for an organization to be considered effective. The present study empirically validated these models and explored the links between them. Data was collected via a web-based questionnaire administered to a broad sample of individuals who work in organizations. Results supported a model of Organization Support of Collaboration with six factors (Connect to the Environment, Craft a Culture of Collaboration, Understand Work Processes, Design Using an Array of Structures, Build Shared Leadership, and Align Support Systems) and a model of Organization Effectiveness with six factors (Performance, Employee Involvement, Flexibility, Customer Satisfaction, New Customer Development, and Treatment of People). Connect to the Environment predicted five of the six Organization Effectiveness factors, and Craft a Culture of Collaboration predicted four of the six, notably with a connection to Performance. For the predicted relationships between the models, nine hypotheses were supported, six were not supported, and three unexpected significant relationships were found. Implications ...
Date: December 2005
Creator: Harris, Cheryl Lynne
Partner: UNT Libraries

A Comparison of Brief Versus Extended Paired-Choice Preference Assessment Outcomes.

Description: Few studies have systematically evaluated whether preferences can reliably be identified using brief procedures. Typically, studies have used brief procedures to select potential reinforcers for use in intervention procedures. A total of 17 food and leisure paired-choice preference assessments were administered to 10 subjects in order to evaluate the extent to which the results of a brief (i.e., single-session) assessment correspond with those from more extended procedures (i.e., 5 sessions). Eleven out of the 17 brief and extended assessments identified the same stimulus as the most preferred (highest rank). Outcomes suggest that a brief assessment can be useful when a single, potent reinforcing stimulus is desired, and an extended assessment should be conducted when a larger number of preferred stimuli is desired.
Date: December 2005
Creator: Cason, Caroline Adelaide
Partner: UNT Libraries

A Comparison Study of the Experiences of Educators and Non-Educators in Promoting Reading and Reading Related Skills of their Own Preschool Children

Description: The rationale for this study was to evaluate the home literacy environments of educators and non-educators to investigate whether educators provide "richer" home environments than non-educator mothers. This research explores the mothers' perceptions of their children, views of reading, methods of promoting a positive reading environment, dealing with personal demands and emotions, and their expectations related to promoting reading. The participants in the study are 2 elementary school teachers with preschool children and 2 non-educator mothers with preschool children. Results indicated that being an educator is not an isolated characteristic of providing a rich home environment. The educational attainment of the mother was discovered to have greater influence on home literacy environment than the mother's profession. Higher educated mothers provided richer home environments than their less educated counterparts.
Date: December 2005
Creator: Fitzpatrick, Tamecca S.
Partner: UNT Libraries

A Culturally Sensitive Intervention in Pain Management Settings: Use of Dichos in Multi-Ethnic Pain Groups.

Description: The present study explored whether use of Spanish language sayings, or dichos, improved group climate within multi-ethnic chronic pain groups. Use of this form of figurative language fits within psychological theory identifying use of metaphor as a means of promoting change and creating new meaning. Further, metaphor use is consistent with the broader aims of experiential therapy. Group climate was measured by group members' self reports using the Group Climate Questionnaire-Short Form. A pilot study involving Latino Americans in medical and non-medical contexts aided in categorizing dichos as high versus low-relevance. It was anticipated that clients would rate high-relevance sessions as involving greater engagement, and less conflict and avoidance than low-relevance groups. Participants were recruited from four multidisciplinary pain management clinics offering similar programs. Once every four to six weeks, group leaders were provided with a list of either high or low-relevance dichos, and were blind to the existence of dichos categories. Three hierarchical regression analyses were employed to determine whether dichos relevance, characterized as low, mixed or highly relevant, contributed to variance in group conflict, avoidance and engagement. Dichos familiarity was the last variable entered into the regression equation, with gender, ethnicity and acculturation score entered in sequential fashion. Consistent with predictions, low-relevance groups yielded higher conflict scores than all groups combined. Also, high-relevance groups predicted lower avoidance when compared to all groups. In contrast to hypotheses, high-relevance groups predicted lower ratings of group engagement when compared to all groups. Post-hoc analysis indicated the mixed-relevance groups yielded significantly higher engagement scores than the low and high-relevance groups. Implications of these findings are discussed in relation to impact on approaches to group therapy with Latino American clients, and within the chronic pain population. Limitations of the study and recommendations for future research are offered.
Date: December 2005
Creator: Riley, Celeste Arden
Partner: UNT Libraries

Customer Perceptions of Fairness in Hotel Revenue Management.

Description: The purpose of the study was to determine customer perceptions of fairness concerning pricing policies charged by the hotel industry, and to examine how different outcomes in pricing policies affect customer perceptions of fairness. Convenience-Interception survey sampling was used to collect 460 sample data at the Dallas Love Field Airport. After analyzing data, one can infer that when revenue management information was provided, customers are satisfied. Further, age, education, Airline FFP enrolled and redeem miles, and pricing based on marketing channels plays an imperative role in this study.
Date: December 2005
Creator: Sanghavi, Punit
Partner: UNT Libraries

Determination of Dissociation Constants for GABAA Receptor Antagonists using Spontaneously Active Neuronal Networks in vitro

Description: Changes in spontaneous spike activities recorded from murine frontal cortex networks grown on substrate-integrated microelectrodes were used to determine the dissociation constant (KB) of three GABAA antagonists. Neuronal networks were treated with fixed concentrations of GABAA antagonists and titrated with muscimol, a GABAA receptor agonist. Muscimol decreased spike activity in a concentration dependent manner with full efficacy (100% spike inhibition) and a 50% inhibitory concentration (IC50) of 0.14 ± 0.05 µM (mean ± SD, n=6). At 10, 20, 40 and 80 µM bicuculline, the muscimol IC50 values were shifted to 4.3 ± 1.8 µM (n=6), 6.8 ± 1.7 µM (n=6), 19.3 ± 3.54 µM (n=10) and 43.5 µM (n=2), respectively (mean ± SD). Muscimol titration in the presence of 10, 20, 40 µM of gabazine resulted in IC50s values of 20.1 (n=2), 37.17 (n=4), and 120.45 (n=2), respectively. In the presence of 20, 80, and 160 µM of TMPP (trimethylolpropane phosphate) the IC50s were 0.86 (n=2), 3.07 (n=3), 6.67 (n=2) µM, respectively. Increasing concentrations of GABAA antagonists shifted agonist log concentration-response curves to the right with identical efficacies, indicating direct competition for the GABAA receptor. A Schild plot analysis with linear regression resulted in slopes of 1.18 ± 0.18, 1.29 ± 0.23 and 1.05 ± 0.03 for bicuculline, gabazine and TMPP, respectively. The potency of antagonists was determined in terms of pA2 values. The pA2 values were 6.63 (gabazine), 6.21 (bicuculline), and 5.4 (TMPP). This suggests that gabazine has a higher binding affinity to the GABAA receptor than bicuculline and TMPP. Hence, using spike rate data obtained from population responses of spontaneously active neuronal networks, it is possible to determine key pharmacological properties of drug-receptor interactions.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2005
Creator: Oli-Rijal, Sabnam
Partner: UNT Libraries

Development of a Hybrid Molecular Ultraviolet Photodetector based on Guanosine Derivatives

Description: Modern studies on charge transfer reaction and conductivity measurements of DNA have shown that the electrical behavior of DNA ranges from that of an insulator to that of a wide bandgap semiconductor. Based on this property of DNA, a metal-semiconductor-metal photodetector is fabricated using a self-assembled layer of deoxyguanosine derivative (DNA base) deposited between gold electrodes. The electrodes are lithographically designed on a GaN substrate separated by a distance L (50nm < L < 100nm). This work examines the electrical and optical properties of such wide-bandgap semiconductor based biomaterial systems for their potential application as photodetectors in the UV region wherein most of the biological agents emit. The objective of this study was to develop a biomolecular electronic device and design an experimental setup for electrical and optical characterization of a novel hybrid molecular optoelectronic material system. AFM results proved the usage of Ga-Polar substrate in conjugation with DG molecules to be used as a potential electronic based sensor. A two-terminal nanoscale biomolectronic diode has been fabricated showing efficient rectification ratio. A nanoscale integrated ultraviolet photodetector (of dimensions less than 100 nm) has been fabricated with a cut-off wavelength at ~ 320 nm.
Access: This item is restricted to the UNT Community Members at a UNT Libraries Location.
Date: December 2005
Creator: Liddar, Harsheetal
Partner: UNT Libraries

The Effect of Parent English Literacy Training on Student Achievement.

Description: When the Bush administration set out to revolutionize public education through the requirements commanded by No Child Left Behind Act of 2001 (NCLB), framers of the legislation chose language that appeared inclusive of all students in U.S. schools. The law demands that English language learners take the mandated exams early in their academic careers in the United States even though research indicates most will fail due to lack of time to acquire sufficient language proficiently to demonstrate their learning on the exams. Viewed through a critical theory lens, the inclusive nature of NCLB is in fact, oppressing ELL students. One district in Texas The study involved ELL students in grades 1-12 in a school district in North Central Texas that uses its family literacy center as an intervention to aid ELL families in English language acquisition. Students fell into three categories: students and parents who attend the family literacy center English classes, students whose parents attend the family literacy center English classes but the students do not attend, and students and parents who do not attend the family literacy center English classes. The quantitative data for the study were reading and math Texas Assessment of Knowledge and Skills (TAKS) and Texas English Language Proficiency Assessment System (TELPAS) scores of ELL students administered by the district in spring 2005. The independent variable was attendance at the family literacy center English classes. A series of one-way analyses of variance (ANOVA) and descriptive statistics (mean, standard deviation, homogeneity of variance) was applied to the data and significant differences were observed on only two measures of the TELPAS. The qualitative data were phenomenological interviews of teachers at the district-run family literacy center. Data derived from in-depth phenomenological interviews were between August and September 2005.
Date: December 2005
Creator: Clayton, Christina Dick
Partner: UNT Libraries