You limited your search to:

  Partner: UNT Libraries
UNDP Climate Change Country Profiles:Morocco
These country-level climate data summaries address the climate change information gap for developing countries by making use of existing climate data to generate a series of 52 country-level studies of climate observations and the multi-model projections digital.library.unt.edu/ark:/67531/metadc226616/
UNDP Climate Change Country Profiles: Cuba
These country-level climate data summaries address the climate change information gap for developing countries by making use of existing climate data to generate a series of 52 country-level studies of climate observations and the multi-model projections digital.library.unt.edu/ark:/67531/metadc226681/
UNDP Climate Change Country Profiles: Grenada
These country-level climate data summaries address the climate change information gap for developing countries by making use of existing climate data to generate a series of 52 country-level studies of climate observations and the multi-model projections digital.library.unt.edu/ark:/67531/metadc226613/
Polar Bears at Risk
Satisfactory monitoring information has been obtained for most polar bear populations in recent years, however there is concern about hunting in areas without formal quota systems, such as Greenland. A range of toxic pollutants, including heavy metals, radioactivity, and persistent organic pollutants (POPs) are found throughout the Arctic. Of greatest concern are the effects of POPs on polar bears, which include a general weakening of the immune system, reduced reproductive success and physical deformities. The expansion of oil development in the Arctic poses additional threats; for example, disturbances to denning females in the Arctic National Wildlife Refuge in Alaska could undermine recruitment of the Beaufort Sea polar bear population. digital.library.unt.edu/ark:/67531/metadc226619/
Picosecond Dynamics of Free-Carrier Populations, Space-Charge Fields, and Photorefractive Nonlinearities in Zincblende Semiconductors
Generally, nonlinear optics studies investigate optically-induced changes in refraction or absorption, and their application to spectroscopy or device fabrication. The photorefractive effect is a nonlinear optical effect that occurs in solids, where transport of an optically-induced free-carrier population results in an internal space-charge field, which produces an index change via the linear electrooptic effect. The photorefractive effect has been widely studied for a variety of materials and device applications, mainly because it allows large index changes to be generated with laser beams having only a few milliwatts of average power.Compound semiconductors are important photorefractive materials because they offer a near-infrared optical response, and because their carrier transport properties allow the index change to be generated quickly and efficiently. While many researchers have attempted to measure the fundamental temporal dynamics of the photorefractive effect in semiconductors using continuous-wave, nanosecond- and picosecond-pulsed laser beams, these investigations have been unsuccessful. However, studies with this goal are of clear relevance because they provide information about the fundamental physical processes that produce this effect, as well as the material's speed and efficiency limitations for device applications.In this dissertation, for the first time, we time-resolve the temporal dynamics of the photorefractive nonlinearities in two zincblende semiconductors, semi-insulating GaAs and undoped CdTe. While CdTe offers a lattice-match to the infrared material HgxCd1-xTe, semi-insulating GaAs has been widely used in optoelectronic and high-speed electronic applications. We use a novel transient-grating experimental method that allows picosecond temporal resolution and high sensitivity. Our results provide a clear and detailed picture of the picosecond photorefractive response of both materials, showing nonlinearities due to hot-carrier transport and the Dember space-charge field, and a long-lived nonlinearity that is due to the EL2 midgap species in GaAs. We numerically model our experimental results using a general set of equations that describe nonlinear diffraction and carrier transport, and obtain excellent agreement with the experimental results in both materials, for a wide variety of experimental conditions. digital.library.unt.edu/ark:/67531/metadc2202/
Explorations with polycarbocyclic cage compounds
A variety of novel cage-functionalized pyridyl containing crown ethers have been prepared for use in selective alkali metal complexation studies. A highly preorganized, cage-functionalized cryptand also has been designed and has been synthesized for use as a selective Li+ complexant. The alkali metal picrate extraction profiles of these cage-functionalized crown ethers also have been studied. Novel cage-functionalized diazacrown ethers have been prepared for selective alkali metal complexation studies. Alkali metal picrate extraction experiments have been performed by using this new class of synthetic ionophores to investigate the effects of cage-annulation and the influence of N-pivot lariat sidearms upon their resulting complexation properties. Novel pyridyl containing calix[4]arene receptors were prepared. Analysis of their respective 1H NMR and 13C NMR spectra suggests that calix[4]arene moieties in the ligand occupy the cone conformation. The complexation properties of these host molecules were estimated by performing a series of alkali metal picrate extraction experiments. An optically active cage-functionalized crown ether which contains a binaphthyl moiety as the chiral unit was prepared. The ability of the resulting optically active crown ether to distinguish between enantiomers of guest ammonium ions (i.e., phenylethylamonium and phenylglycinate salts) in transport experiments was investigated. Hexacyclo[11.2.1.02,12.05,10.05,15.010,14]hexadeca-6,8-diene-4,11-dione was prepared from hexacyclo[7.4.2.01,9.03,7.04,14.06,15] pentadeca-10,12-diene-2,8-dione. Unanticipated but remarkable acid and base promoted rearrangements of this new cage dione to novel polycyclic systems were observed and subsequently were investigated. The structures of the new systems thereby obtained were determined unequivocally by application of X-ray crystallographic methods. It is noteworthy that the reactions reported herein each provide the corresponding rearranged product in high yield in a single synthetic step. Pi-facial and regioselectivity in the thermal Diels-Alder cycloaddition between hexacyclo[11.2.1.02,12.05,10.05,15.010,14]hexadeca-6,8-diene- 4,11-dione and ethyl propiolate have been explored. This reaction proceeds via stereospecific approach of the dienophile toward the syn face of the diene p -system. However, [4+2]cycloaddition proceeds with only modest proximal/distal regioselectivity. The structure of the minor reaction product was established unequivocally via application of X-ray crystallographic techniques. digital.library.unt.edu/ark:/67531/metadc2218/
"Marvelous Accidents": The Concerto for Prepared Piano and Chamber Orchestra of John Cage
John Cage’s Concerto for Prepared Piano and Chamber Orchestra (1950-51) holds a unique position within the composer’s oeuvre as the first work based in part on chance-derived compositional procedures. Cage entered into such practice gradually, incrementally abandoning subjective taste and personal expression through the course of the work. Drawing from the philosophical framework provided by Cage’s "Lecture on Nothing" (1950) and "Lecture on Something" (c. 1951-52), this thesis explores the aesthetic foundations of the concerto and examines Cage’s compositional methodology throughout its three movements. Special attention is paid to the procedure underlying the first movement, whose analysis is based largely on the composer’s manuscript materials for the work. digital.library.unt.edu/ark:/67531/metadc2260/
Arctic Climate Impact Science — An Update Since ACIA
The study found that change was occuring in all Arctic systems, impacting on the atmosphere and the oceans, sea ice and ice sheets, snow and permafrost, as well as species and populations, food webs, ecosystems and human societies. digital.library.unt.edu/ark:/67531/metadc226550/
Climate Change in Indonesia Implications for Humans and Nature
The report highlights that annual rainfall in the world’s fourth most populous nation is already down by 2 to 3 per cent, and the seasons are changing. digital.library.unt.edu/ark:/67531/metadc226554/
G8 Climate Scorecards
The report concludes with a global cumulative GHG emission cap for the period from 2010 till 2050. It outlines mid-term and long-term cumulative emission allowances for key countries under the three equity approaches and trajectories for these countries to keep global warming below 2 degrees Celsius. The objective of the report is to initiate a constructive debate among and foster long-term commitments of the parties while moving towards a fair, ambitious and binding Copenhagen agreement. digital.library.unt.edu/ark:/67531/metadc226591/
New Mexico Climate Change Advisory Group Final Report
Recognizing the profound implications that global warming and climate variation could have on the economy, environment and quality of life in the Southwest, New Mexico Governor Bill Richardson signed Executive Order 05-33 on June 5th, 2005, establishing the New Mexico Climate Change Advisory Group. The Governor directed the CCAG to prepare a report that includes a projection of the State's future GHG emissions and policy recommendations for reducing New Mexico's total greenhouse gas emissions to 2000 levels by the year 2012, 10 percent below 2000 levels by 2020 and 75 percent by 2050. digital.library.unt.edu/ark:/67531/metadc226598/
Fast Facts: Climate Change and UNDP
Making poverty history and tackling climate change go hand-in-hand because receding forests, changing rainfall patterns and rising sea levels trap people in hardship and undermine their future. Studies in Ethiopia show that children exposed to drought in early childhood are 36 percent more likely to be malnourished five years later. digital.library.unt.edu/ark:/67531/metadc226552/
Montana Climate Change Action Plan: Final Report of the Governor’s Climate Change Advisory Committee
Report of the Governor’s Climate Change Advisory Committee, managed by the Montana Department of Environmental Quality and facilitated by the Center for Climate Strategies. It provides 54 policy recommendations help reduce the state’s emissions of green house gases to 1990 levels by the year 2020. Most will have additional benefits, including reduced reliance on imported fossil fuels, reduction in air pollution, increased opportunity for Montana agriculture to provide renewable fuels, healthier forests, and the opportunity for the state to be a leader in developing new technologies. digital.library.unt.edu/ark:/67531/metadc226565/
Night of no Exile
Night of no Exile is a collection of poems preceded by a critical article entitled "‘Exile seems both a blessing and a curse': A Blissful Reading of Li-Young Lee's Poetry." That article discusses Lee's quest to achieve communication, truth, and transcendence through poetic language and concludes that he finally reaches his goal through a leap from narrative poetry to lyricism. The "exile" alluded to in the title of the article is not only geographic, but also interioran exile due to the natural limitations of all languages, and which can be bridged only in linguistic ways. Lee's solution to that problem (lyricism) turns his poetry into what Roland Barthes would call "a text of bliss," a text that manages to deeply destabilize language, while simultaneously achieving a new kind of meaning. In the main body of the manuscript, the first section contains short love lyrics. The second section, "Night of no Exile," is an attempt at the demanding genre of the longer lyric poem. The third section uses short lyrics to explore various topics, such as discovering one's identity, friendship and solidarity between women, family history, and childhood memories. Finally, the last section includes poems, four of them longer, attempting to combine narrative and lyric impulses in a way not unlike Li-Young Lee's experimentation with those two genres. digital.library.unt.edu/ark:/67531/metadc2217/
A sensory tour of Cape Cod, Thoreau's transcendental journey to spiritual renewal
Access: Use of this item is restricted to the UNT Community.
Predominantly darker than his other works, Cape Cod depicts Henry David Thoreau's interpretation of life as a struggle for survival and a search for salvation in a stark New England setting. Representing Thoreau's greatest test of the goodness of God and nature, the book illustrates the centrality of the subject of death to Thoreau's philosophy of life. Contending that Thoreau's journey to the Cape originated from an intensely personal transcendental impulse connected with his brother's death, this study provides the first in-depth examination of Thoreau's use of the five senses in Cape Cod to reveal both the eccentricities inherent in his relationship with nature and his method of resolving his fears of mortality. Some of the sense impressions in Cape Cod--particularly those that center around human death and those that involve tactile sensations--suggest that Thoreau sometimes tried to master his fears by subconsciously altering painful historical facts or by avoiding the type of sensual contact that aggravated the repressed guilt he suffered from his brother's death. Despite his personal idiosyncrasies, however, Thoreau persisted in his search for truth, and the written record of his journey in Cape Cod documents how his dedication to the transcendental process enabled him to surmount his inner turmoil and reconfirm his intuitive faith. In following this process to spiritual renewal, Thoreau begins with subjective impressions of nature and advances to knowledge of objective realities before ultimately reaching symbolic and universal truth. By analyzing nature's lessons as they evolve from Thoreau's use of his senses, this dissertation shows that Cape Cod, rather than invalidating Thoreau's faith, actually expands his transcendental perspective and so rightfully stands beside Walden as one of the fundamental cornerstones of his canon. In addition, the study proffers new support for previous psychoanalytical interpretations of Thoreau and his writings, reveals heretofore unrecognized historical inaccuracies in his account of the shipwreck that frames the book's opening, and provides the first detailed consideration of the linguistic implications of Cape Cod. digital.library.unt.edu/ark:/67531/metadc2264/
The Development of IAM District Lodge 776 in Fort Worth, Texas, 1942-1946: A Case Study in the Growth of Organized Labor During World War II
This thesis concentrates on a local union of the International Association of Machinists (IAM), District Lodge 776, of Fort Worth, Texas, during the war years. The main argument of the thesis runs along three basic lines. First, it demonstrates that the experiences of the Fort Worth Machinists clearly fit into the national labor movement during the war years. Second, it argues that the existence, survival, and strength of the union depended greatly on outside forcesan expanding national economy, a powerful national union, and a generally labor-friendly government. Third, it shows that union officers and rank-and-file members used their bases of strengththe national economy, the national IAM, and the federal governmentto build an effective local labor organization. digital.library.unt.edu/ark:/67531/metadc2205/
The Effect of Increased Collaboration Among the Library Media Specialist and School Personnel on Perceptions of the Roles and Responsibilities of the Library Media Specialist
Access: Use of this item is restricted to the UNT Community.
This study measured and explored changes in perceptions of the roles and responsibilities of the library media specialist when the level of collaboration increased. Seven library media specialists targeted four members of their educational communities with whom to increase collaborative activities. Before and after the collaboration began, the library media specialists, the teachers with whom they chose to collaborate, other members from the same educational community, and a control group that did not participate in increased collaboration were given a roles and responsibilities rank-order form. This form was used to measure changes in perceptions regarding the importance of the three roles and selected responsibilities related to the three roles before and after the collaborative experience. The library media specialists and the targeted teachers also kept reflection logs to record factors that enhanced collaboration, factors that inhibited collaboration, and any changes in their teaching style as a result of the collaborative experience. Results indicate that the participating library media specialists themselves experienced the most change. Role identification remains a problem as library media specialists seek to become teaching partners with classroom teachers yet still must keep the library media center aligned with school and district goals and move toward making it an information center that provides information resources for all members of the educational community in an effective, efficient and timely manner. Major enhancers to increased collaboration included flexible scheduling of the library, sharing ideas and resources, partnership in teaching, and student achievement. Major inhibitors included time, wanting to keep things the way they were, and lack of resources. Changes in teaching practice included working with another professional instead of in isolation, integrating many resources into the lesson to provide for the learning needs of all students, the incorporation of technology into the lesson, and an awareness of the roles of both library media specialists and teachers. digital.library.unt.edu/ark:/67531/metadc2221/
Explaining Buyer Opportunism in Business-to-Business Relationships
The interaction among firms in the supply chain is necessary for business process execution and relationship success. One phenomenon of great significance to buyer-supplier relationships is opportunism. Opportunism is defined as behavior that is self-interest seeking with guile. It is manifested in behaviors such as stealing, cheating, dishonesty, and withholding information. Opportunism negatively impacts relational exchange tenets such as trust, commitment, cooperation, and satisfaction. Furthermore, perceptions of opportunism negatively affect firm performance. In lieu of the known negative effects of opportunistic behavior on buyer-supplier relationships, why do agents continue to engage in opportunistic tactics with their exchange partners? A comprehensive examination is necessary in order to understand why sourcing professionals engage in acts of opportunism. Understanding why opportunism occurs will reveal how to deter it, and this remains a gap in the literature. Based on theories in economics, marketing channels, supply chain management, decision science, and psychology, a comprehensive model tested a set of factors hypothesized to drive the use of opportunistic tactics. Factors include buyer-supplier relationship-specific factors, environmental factors, individual personality-related factors, and situational factors. Data was collected via internet survey of sourcing professionals from private industry and government agencies. Common to many studies of ethics, respondents made choices based on two hypothetical vignettes. Two logistic regression models were used to test the hypotheses. Factors found to affect buyer opportunism included buyer power, corporate ethical values, pressure to perform, leadership opportunism, business sector, honesty/integrity, and subjective expected utility. This research contributes to theory by combining several disparate theories to best explain opportunism. A comprehensive evaluation should determine which theory explains the most variance in decision making. The study contributes to practice by identifying those important factors contributing to a sourcing professional's decision to use opportunistic tactics. The ability to manage these factors should improve the probability of relationship success. Additionally, the identification of these factors should help leaders to make more accurate estimates of transaction costs - key knowledge required to make an informed make or buy governance decision. digital.library.unt.edu/ark:/67531/metadc3664/
A Wonder Whose Origin is not Known: The Importance of the Orphan Hero in Otherworldly Film
The purpose of this thesis is to explore the importance of the orphan hero in film and his resonance with the American people. It explores the orphan and the American identities, the archetypes found in myths, and the hero in American culture. The three heroes (Batman, Anakin Skywalker, and Harry Potter) represent certain aspects of orphan heroes: the capacity for sacrifice and the need to resist focusing on oneself. The type of hero each becomes has its source in the response he takes to his orphanhood. These young men suffered great loss early in their lives, but found the strength to sacrifice themselves for others, the ultimate sign of a hero. digital.library.unt.edu/ark:/67531/metadc3694/
A test of the effects of linguistic stereotypes in children's animated film: A language attitude study.
This study examined the claim that animated films influence childrens' opinions of accented-English. Two hundred and eighteen 3rd through 5th graders participated in a web-based survey. They listened to speakers with various accents: Mainstream US English (MUSE), African American Vernacular English (AAVE), French, British, and Arabic. Respondents judged speakers' personality traits (Work Ethic, Wealth, Attitude, Intelligence), assigned jobs/life positions, and provided personal information, movie watching habits, and exposure to foreign languages. Results indicate: (1) MUSE ranks higher and AAVE lower than other speakers, (2) jobs/life positions do not correlate with animated films, (3) movie watching habits correlate with AAVE, French, and British ratings, (4) foreign language exposure correlates with French, British, and Arabic ratings. digital.library.unt.edu/ark:/67531/metadc3605/
Latino success stories in higher education: A qualitative study of recent graduates from a health science center.
This study used qualitative research, particularly life history analysis, to determine the personal pathways of success for Latino students who chose to enter a health science center for graduate study and who graduated. By giving voice to individual success stories of Latino students, some of the influences on the life pathways of these graduates were determined. For the purposes of this study, success was defined as graduation from a health science center with either a doctor of philosophy, doctor of public health or doctor of osteopathic medicine degree. Four research subjects agreed to participate in this study from a possible 11 students from the graduating class of 2004-2005 at this health science center. Data were gathered through multiple in-depth interviews of the students themselves over a period of no more than one month for each participant. Data were analyzed using the mind mapping technique and Padilla's unfolding matrix. Findings indicate that each participant traveled a different pathway to achieve educational success although similarities did exist across participants. The influences of family background, cultural background, educational background and personal perceptions and goals did affect the pathways of these four Latino graduates. While three of four participants indicated that family was the most important influence on their academic success, all participants related the importance of family to their success, although their definitions of family seemed to vary and included the concepts of education, culture, and personal perceptions and goals. The concepts of family support of education and a culture of education within the family unit emerged as similar themes among study participants. Other similarities among participants were a high academic self-concept, a strong internal locus of control, the ability to create academic community, and a positive view of potentially negative situations. Individual themes emerged from the narratives within each category for each participant. The impact of previous studies on student success, using undergraduate models, was reviewed, and one influence was found among the study participants that had not been used in previous models - health. Implications of findings from this study for educational policy, programs, and practice are discussed. digital.library.unt.edu/ark:/67531/metadc3687/
Open Access at the UNT Libraries
This presentation discusses the University of North Texas (UNT) Libraries' Digital Library collection. It showcases the collections included in the UNT Digital Library, the statistics of use, and highlights the UNT Scholarly Works institutional repository. digital.library.unt.edu/ark:/67531/metadc36275/
UNT Digital Libraries: Past, Present and Future
This presentation gives an overview of various digital initiatives by the University of North Texas (UNT) Libraries' Digital Projects Unit. digital.library.unt.edu/ark:/67531/metadc36272/
What's My Leadership Color?
This presentation discusses leadership skills in relation to colors. The topics relate to the "True Colors" quiz, leadership colors, attributes and stressors, and esteem and colors. The discussion is based on "True Colors - An Approach to Understanding Self and Others" by Julie Ray, Partners in Learning. digital.library.unt.edu/ark:/67531/metadc36277/
The Role of Social Capital in Organizations: The Precursors and Effects of Social Capital among Certified Nurse Aides in Nursing Homes
The role of social capital in forming organizational commitment is the focus of this research. Organizational social capital is the idea that social relationships have value in the organization. The theoretical framework is based on Kanter's (1993) structure of organizational commitment. This research views the structure within organizations based on global empowerment, job satisfaction, organizational commitment, and social capital. In addition, the role that race, income, and education affect the organizational structure is also taken into account. The organizational configuration was assembled using a structural equation model with latent variables employing a sample of 235 certified nurse aides. The sample was collected from 10 nursing homes in the Dallas-Ft.Worth metropolitan area. It was expected that Kanter's general format is reestablished within the sample. In fact, the study found that empowerment significantly influences job satisfaction. In turn, job satisfaction does foster organizational commitment. Although Kanter's original thesis was supported in this analysis, it was also determined that social capital plays a significant mediating role in creating organizational commitment. Furthermore, this research indicates that social capital alone can create organizational commitment. Thus, in conclusion, this research builds on Kanter's original idea and argues that organizational commitment is based on job satisfaction, global empowerment, and social capital. digital.library.unt.edu/ark:/67531/metadc3627/
Employing Diffusion of Innovation Theory for Examining Adoption and Implementation of Preservation Metadata in the Cultural Heritage Community: An Exploratory Study
Poster presented at the 2006 ALISE Conference (Doctoral Poster session). The poster was one of the five award-winning poster presentations for the best doctoral dissertation proposal. digital.library.unt.edu/ark:/67531/metadc36270/
Digitization 101
This presentation introduces topics related to digital libraries, including digital asset management, metadata, controlled vocabularies, and digital preservation. digital.library.unt.edu/ark:/67531/metadc36279/
Open Access to UNT Faculty's Scholarly Publications
This presentation discusses open access policies at the University of North Texas (UNT). The topics include an introduction to open access, a discussion of open access policies, and implementation ideas for workflow and technology support. digital.library.unt.edu/ark:/67531/metadc36276/
Reference Beyond the Desk: Nontraditional Modes of Reference
This presentation discusses virtual reference services in libraries. The topics include virtual reference systems, with examples of what other institutions have adopted, collaborative virtual reference services with examples, and how reference librarians away from their desk and even off campus have developed new referencing services. digital.library.unt.edu/ark:/67531/metadc36273/
The Significance of Dmitri Shostakovich's Piano Sonata Op.12
The aspiration of this dissertation is to bring forth the significance of Shostakovich's Piano Sonata Op.12. This sonata is a hybrid of the German musical tradition, Russian Modernism, and Liszt's thematic transformation technique. It demonstrates Shostakovich's highly intellectual compositional skills influenced by the education that he received at St. Petersburg Conservatory as well as the exposure to modern music in the 1920s. This dissertation discusses composition techniques, such as the harmonic piers adapted from Alexander Scriabin, neighboring-tone technique, which involves the application of semitone cell throughout the piece, as well as the technique of thematic transformation borrowed from Liszt. These all come together by Shostakovich's design in the most controversial sonata form. The Piano Sonata Op.12 also sheds light on Shostakovich's early compositional style and proves its contribution to the evolution of sonata genre in the twentieth-century. digital.library.unt.edu/ark:/67531/metadc3657/
Academic Lineage and Student Performance in Medical School
This research investigated the association between academic lineage and student performance in medical school. The purposes of the study were to: (1) determine whether the Carnegie classifications of medical school applicants' institutions of origin are associated with academic performance in medical school; (2) consider the relationship between the admission selectivity of the schools of origin and the academic performance of medical school students; (3) compare the performance of medical students from institutions under public governing control with students from privately controlled institutions; and (4) establish a model by which the relative academic strengths of applicants from a variety of undergraduate institutions can be understood more clearly based on the previous performance of medical students from schools with similar institutional characteristics. A review of the literature on medical school admissions was completed and used to develop this research. Medical students from the University of Texas Southwestern Medical Center at Dallas who enrolled between the years 1990 and 1994 and graduated or were dismissed between the years 1994 and 1998 were selected as the sample for the study (n=933). The undergraduate institution of origin for each student was coded based on its Carnegie classification, admissions selectivity group, and whether its governing control was public or private. Because the sample was not randomly selected and the data likely would not meet the assumptions of equal means and variance with the population, nonparametric analyses of variance and multiple comparison tests were completed to compare the groups of the independent variables over each dependent variable. The analyses revealed that for the sample of medical students selected for this study there was an association between academic lineage and student performance in medical school. Differences were found among Carnegie classifications on the dependent variables of cumulative medical school grade point average, class rank, failure rate, and score on Step 1 of the United States Medical Licensure Examination. Further, it was found that admission selectivity was also associated with student performance in medical school for each dependent variable except failure rate. Finally, the study results indicated no association between public or private governing control and student performance in medical school. digital.library.unt.edu/ark:/67531/metadc2206/
Bulk and interfacial effects on density in polymer nanocomposites
The barrier properties of polymers are a significant factor in determining the shelf or device lifetime in polymer packaging. Nanocomposites developed from the dispersion of nanometer thick platelets into a host polymer matrix have shown much promise. The magnitude of the benefit on permeability has been different depending on the polymer investigated or the degree of dispersion of the platelet in the polymer. In this dissertation, the effect of density changes in the bulk and at the polymer-platelet interface on permeability of polymer nanocomposites is investigated. Nanocomposites of nylon, PET, and PEN were processed by extrusion. Montmorillonite layered silicate (MLS) in a range of concentrations from 1 to 5% was blended with all three resins. Dispersion of the MLS in the matrix was investigated by using one or a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Variation in bulk density via crystallization was analyzed using differential scanning calorimetry (DSC) and polarized optical microscopy. Interfacial densification was investigated using force modulation atomic force microscopy (AFM) and ellipsometry. Mechanical properties are reported. Permeability of all films was measured in an in-house built permeability measurement system. The effect of polymer orientation and induced defects on permeability was investigated using biaxially stretched, small and large cycle fatigue samples of PET and nylon nanocomposites. The effect of annealing in nylon and nanocomposites was also investigated. The measured permeability was compared to predicted permeability by considering the MLS as an ideal dispersion and the matrix as a system with concentration dependent crystallinity. digital.library.unt.edu/ark:/67531/metadc3619/
A Personal Documenation System for Scholars: A Tool for Thinking
This exploratory research focused on a problem stated years ago by Vannevar Bush: "The problem is how creative men think, and what can be done to help them think." The study explored the scholarly work process and the use of computer tools to augment thinking. Based on a review of several related literatures, a framework of 7 major categories and 28 subcategories of scholarly thinking was proposed. The literature was used to predict problems scholars have in organizing their information, potential solutions, and specific computer tool features to augment scholarly thinking. Info Select, a personal information manager with most of these features (text and outline processing, sophisticated searching and organizing), was chosen as a potential tool for thinking. The study looked at how six scholars (faculty and doctoral students in social science fields at three universities) organized information using Info Select as a personal documentation system for scholarly work. These multiple case studies involved four in-depth, focused interviews, written evaluations, direct observation, and analysis of computer logs and files collected over a 3- to 6-month period. A content analysis of interviews and journals supported the proposed AfFORD-W taxonomy: Scholarly work activities consisted of Adding, Filing, Finding, Organizing, Reminding, and Displaying information to produce a Written product. Very few activities fell outside this framework, and activities were distributed evenly across all categories. Problems, needs, and likes mentioned by scholars, however, clustered mainly in the filing, finding, and organizing categories. All problems were related to human memory. Both predictions and research findings imply a need for tools that support information storage and retrieval in personal documentation systems, for references and notes, with fast and easy input of source material. A computer tool for thinking should support categorizing and organizing, reorganizing and transporting information. It should provide a simple search engine and support rapid scanning. The research implies the need for tools that provide better affordances for scholarly thinking activities. digital.library.unt.edu/ark:/67531/metadc2258/
Syllabus for Advanced Placement Biology
The purpose of this syllabus is to provide a working copy to those teachers of the advanced placement biology course taught at the high school level. Reference materials used were the Texas Education Agency ( TEA ) approved Campbell text Biology and the College Board's, Advanced Placement Biology Laboratory Manual. The syllabus is divided into major topics with outlined notes and includes laboratory exercises as recommended by the College Board. The AP biology course is intended to be equivalent to college biology. College freshman biology courses can differ among colleges and among teachers within the same college. This syllabus is intended to serve as an aid to AP teachers, to cover the topics and experiments as set out by the College Board, and to the high school student, the necessary material to successfully complete the AP examination while providing freshman biology equivalence. digital.library.unt.edu/ark:/67531/metadc2203/
Hospitality Students' Attitudes and Behavioral Intentions toward Learning and Using Computer Technology
Access: Use of this item is restricted to the UNT Community.
Following Ajzen/Fishbein's 1980 Theory of Reasoned Action, influences of hospitality students' external variables (age, gender, university classification, and work experience) on computer attitudes, and relationships between computer attitudes and intentions to learn and use computers were tested. A sample of 412 hospitality students completed two measurements: Loyd/Gressard's 1984 Computer Attitude Scale, and Behavioral Intentions to Learn and Use Computers. Males and females had positive computer attitudes. Graduates had more positive computer attitudes. No interaction effect existed between gender and classification. No relationships existed between age and work experience on computer attitudes. Computer attitudes positively correlated with intentions to learn and use computers. Results supported the Theory of Reasoned Action. External variables partially influence attitudes and attitudes influence intentions. digital.library.unt.edu/ark:/67531/metadc2279/
Southwest Retort, Volume 33, Number 5, January 1981
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228536/
Southwest Retort, Volume 39, Number 4, April 1986
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228522/
Southwest Retort, Volume 42, Number 5, May 1989
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228520/
Southwest Retort, Volume 43, Number 4, December 1989
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228523/
Southwest Retort, Volume 41, Number 6, September 1988
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228558/
Southwest Retort, Volume 41, Number 4, April 1988
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228503/
Southwest Retort, Volume 34, Number 1, September 1981
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228507/
Southwest Retort, Volume 35, Number 9, May 1983
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228544/
Southwest Retort, Volume 36, Number 8, April 1984
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228500/
Southwest Retort, Volume 39, Number 5, May 1986
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228538/
Harbor: The Act of Autobiography
Access: Use of this item is restricted to the UNT Community.
This written thesis accompanies a sixteen-minute documentary video, Harbor, in which the filmmaker explores her relationship with her father who has suffered a stroke. Detailed accounts of the pre-production, production and post-production of the video allow the reader to understand the challenging and rewarding process of making an autobiographical documentary. Theoretical issues are also discussed, including the validity, criticisms, artistic nature and ethical concerns of autobiographical filmmaking. The filmmaker stresses the universality of her story, and how, despite the film's very personal nature, it is applicable for anyone who has dealt with the illness and/or disability of a parent. digital.library.unt.edu/ark:/67531/metadc2225/
Symmetrical Features of Nikolai Medtner's Language: The Grzovaya Sonata, Opus 53 No. 2
Access: Use of this item is restricted to the UNT Community.
Nikolai Medtner's works evidence an intense interest in symmetrical designs. This concern is manifest at all levels, from the large scale proportions of his numerous ingenious sonata forms to the symmetrically constructed themes and motives. Medtner's works include several instances of palindromic themes and periods. Some palindromic contours are achieved through immediate inversion, creating expansive, symmetrical waves. One of Medtner's thumbprints, symmetrical contrary voice-leading, consists of two or more voices which systematically expand or contract in exact mirror fashion. The contrary movement is usually stepwise, and may be either chromatic or diatonic. Occasionally even larger intervals, such as thirds and fourths, are subjected to this favourite mirroring technique. Such symmetrical expansion and contraction often controls the harmonic progression of several consecutive bars. One of the most striking aspects of Medtner's music is his sophisticated harmonic language. He was fascinated with symmetrical harmonic designs, such as the tritone, the French sixth chord, and the octatonic scale, and made endless and increasingly intricate explorations into these stuctures and the ways in which these apparently nontonal, non-hierarchical forms could be coordinated with the fundamental hierarchy of asymmetrical tonal forms, including triads, major and minor scales, and tonic-dominant relations. Medtner's late work, the Grozovaya Sonata, Opus 53 No.2, is the most concentrated and abstract of his works. The themes are built from highly lapidar motives, giving this work an intensely angular, rigorously mathematical character. All the symmetrical hallmarks of Medtner's language are in abundant evidence in this great work. Features include the extensive symmetrical mirroring of the opening section, frequent use of contrary voice leading as a generator of harmonic progression, and constant tritone shifting. Medtner also builds sequential chains based on two more symmetrical forms, the diminished seventh and the augmented triad. Finally, the design of this unique single movement sonata may be a hybrid of sonata form with palindrome. The Grozovaya Sonata is a microcosm of the symmetrical features of Medtner's language. digital.library.unt.edu/ark:/67531/metadc2271/
Southwest Retort, Volume 38, Number 8, November 1985
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228537/
Southwest Retort, Volume 43, Number 3, November 1989
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228509/
Southwest Retort, Volume 34, Number 4, December 1981
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc228553/