650 Apartments

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The view is of the apartment building in the distance with some parked cars. The facade is comprised of square shapes for windows and the laminate siding. Some yellow siding detail is also visible.
Date: 2004/2006
Creator: Ofis Arhitekti
Object Type: Physical Object
System: The UNT Digital Library

650 Apartments

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The view is of the facade of one of the four apartment modules. The facade is a rich reddish brown and bright yellow with many square windows and balconies.
Date: 2004/2006
Creator: Ofis Arhitekti
Object Type: Physical Object
System: The UNT Digital Library

Application of Cultured Neuronal Networks for Use as Biological Sensors in Water Toxicology and Lipid Signaling.

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This dissertation research explored the capabilities of neuronal networks grown on substrate integrated microelectrode arrays in vitro to be applied to toxicological research and lipid signaling. Chapter 1 details the effects of chlorine on neuronal network spontaneous electrical activity and pharmacological sensitivity. This study demonstrates that neuronal networks can maintain baseline spontaneous activity, and respond normally to pharmacological manipulations in the present of three times the chlorine present in drinking water. The findings suggest that neuronal networks may be used as biological sensors to monitor the quality of water and the presence of novel toxicants that cannot be detected by conventional sensors. Chapter 2 details the neuromodulatory effects of N-acylethanolamides (NAEs) on the spontaneous electrical activity of neuronal networks. NAEs are a group of lipids that can mimic the effects of marijuana and can be derived from a variety of plant sources including soy lecithin. The most prominent NAEs in soy lecithin, palmitoylethanolamide (PEA) and linoleoylethanolamide (LEA), were tested individually and were found to significantly inhibit neuronal spiking and bursting activity. These effects were potentiated by a mixture of NAEs as found in a HPLC enriched fraction from soy lecithin. Cannabinoid receptor-1 (CB1-R) antagonists and other cannabinoid pathway modulators indicated …
Date: August 2004
Creator: Dian, Emese Emöke
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Asserting Identity in Wagner's Shadow: The Case of Engelbert Humperdinck's Königskinder (1897)

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Engelbert Humperdinck (1854-1921), who was considered a Wagnerian due to to his past work in Bayreuth and the Wagnerian traits of his Hänsel und Gretel, seems to have believed that to define himself as a composer, he had to engage somehow with that designation, whether through orthodox Wagner imitation or an assertion of his independence from Wagner's musical legacy. The latter kind of engagement can be seen in Humperdinck's Königskinder (1897), in which he developed a new kind of declamatory notation within the context of melodrama, thus fulfilling Wagnerian ideals as well as progressing beyond them. The effectiveness of Humperdinck's effort is seen in the ensuing critical reception, in which the realities of being heard as a Wagnerian composer are clarified.
Date: August 2004
Creator: Kinnett, Forest Randolph
Object Type: Thesis or Dissertation
System: The UNT Digital Library

An Assessment of the Use of Student Price Response Models to Predict Changes in Undergraduate Enrollment at a Metropolitan University

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Most colleges and universities invest substantial resources in an effort to strategically plan for a sound financial base. The revenue for the financial base is dependent on student enrollment that must be effectively managed. Increases in the price of tuition and fees can lead to decreased enrollment and negatively impact the revenue of an institution. The increases can also impact the enrollment of certain student populations such as minority students and high school graduates enrolling in college for the first time. Many studies have analyzed the price elasticity and student price response models that have been developed over time by reviewing historical price increases and enrollment across institutions. Few studies have used the models to predict changes in the enrollment of students for one college or university after the increases in the cost of attendance are imposed on students. This study sought to analyze the effectiveness of the most commonly reviewed student price response and price elasticity models in predicting changes in undergraduate enrollment at one metropolitan academic university. The three models introduced by Leslie and Brinkman, St. John and Heller were used to analyze the tuition and fee increases and to identify the likely percentage of increase or decrease …
Date: December 2004
Creator: Saxon, Randall J.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Baeyer-Villiger Oxidation of 1,7- & 1,9-dibromopentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione

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Baeyer-Villiger oxidation of 1,9-dibromopentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione (1,9-dibromo-PCU-8,11-dione) was performed by using an excess amount of m-chloroperbenzoic acid (3 equivalents) and resulted in the formation of the corresponding monolactone. The reaction would not proceed to the dilactone stage. The structure of the reaction product was established unequivocally via single crystal X-ray diffraction. Baeyer-Villiger oxidation of 1,9-dibromo-PCU-8,11-dione using ceric ammonium nitrate (CAN) was also performed and afforded a mixture of lactones. Only one of these lactones, which also contained an alkene functionality, could be isolated and characterized. 1,7-dibromo-PCU-8,11-dione was also reacted with CAN, yielding the mono-lactone, which has also been characterized.
Date: May 2004
Creator: Akinola, Adeniyi O.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Barrier and Long Term Creep Properties of Polymer Nanocomposites.

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The barrier properties and long term strength retention of polymers are of significant importance in a number of applications. Enhanced lifetime food packaging, substrates for OLED based flexible displays and long duration scientific balloons are among them. Higher material requirements in these applications drive the need for an accurate measurement system. Therefore, a new system was engineered with enhanced sensitivity and accuracy. Permeability of polymers is affected by permeant solubility and diffusion. One effort to decrease diffusion rates is via increasing the transport path length. We explore this through dispersion of layered silicates into polymers. Layered silicates with effective aspect ratio of 1000:1 have shown promise in improving the barrier and mechanical properties of polymers. The surface of these inorganic silicates was modified with surfactants to improve the interaction with organic polymers. The micro and nanoscale dispersion of the layered silicates was probed using optical and transmission microscopy as well as x-ray diffraction. Thermal transitions were analyzed using differential scanning calorimetry. Mechanical and permeability measurements were correlated to the dispersion and increased density. The essential structure-property relationships were established by comparing semicrystalline and amorphous polymers. Semicrystalline polymers selected were nylon-6 and polyethylene terephthalate. The amorphous polymer was polyethylene terphthalate-glycol. Densification …
Date: December 2004
Creator: Ranade, Ajit
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Bill Jason Priest, Community College Pioneer

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There are few things that are purely American. On that short list are baseball and the two-year community college. Bill Jason Priest possessed skill and acumen for both. The better part of his life was spent developing and defining the junior college into the comprehensive community college. His contributions earned him a prestigious place in the annals of higher education, but his personality was not one of a stereotypical stodgy educator, nor is the story of his life a dry read. After working his way through college, Priest played professional baseball before serving in Naval Intelligence during World War II. His varied experiences helped shape his leadership style, often labeled as autocratic and sometimes truculent in conservative convictions. The same relentless drive that brought him criticism also brought him success and praise. Forthright honesty and risk-taking determination combined with vision brought about many positive results. Priest’s career in higher education began with the two-year college system in California before he was lured to Texas in 1965 to head the Dallas County Junior College District. Over the next fifteen years Priest transformed the junior college program into the Dallas County Community College District (DCCCD) and built it up to seven colleges. …
Date: February 15, 2004
Creator: Whitson, Kathleen Krebbs
Object Type: Book
System: The UNT Digital Library

Bioavailability and toxicity of 2,4,6-trinitrotoluene in sediment.

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TNT (2,4,6-trinitrotoluene) is a persistent contaminant at many military installations and poses a threat to aquatic ecosystems. Data from environmental fate and toxicity studies with TNT revealed that sediment toxicity test procedures required modification to accurately assess sediment TNT toxicity. Key modifications included aging TNT-spiked sediments 8-14 d, basing lethal dose on measured sediment concentrations of the molar sum of TNT and its main nitroaromatic (NA) transformation products (SNA), basing sublethal dose on average sediment SNA concentrations obtained from integration of sediment SNA transformation models, avoiding overlying water exchanges, and minimizing toxicity test durations. Solid phase microextraction fibers (SPMEs) were investigated as a biomimetic chemical measure of toxicity and bioavailability. Both organism and SPME concentrations provided measures of lethal dose independent of exposure scenario (TNT-spiked sediment or TNT-spiked water) for Tubifex tubifex. Among all benthic organisms tested (Chironomus tentans, Ceriodaphnia dubia, T. tubifex) and matrixes, median lethal dose (LC50) estimates based on SPME and organism concentrations ranged from 12.6 to 55.3 mmol SNA/ml polyacrylate and 83.4 to 172.3 nmol SNA/g tissue, ww, respectively. For Tubifex, LC50s (95% CI) based on SNA concentrations in sediment and SPMEs were 223 (209-238) nmol SNA/g, dw and 27.8 (26.0-29.8) mmol SNA/ml, respectively. Reproductive effects …
Date: May 2004
Creator: Conder, Jason M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Biogeography of Montane Mammals on the Colorado Plateau and Adjacent Regions

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This study identifies the biogeographic factors that structure small mammal communities on mountains of the Colorado Plateau and adjacent regions. Forty six isolated ranges were characterized across a 5-state study area encompassing the Colorado Plateau, including the central high plateaus of Utah and the Basin and Range Province (i.e. the Great Basin and mountains of Arizona and New Mexico). Presence/absence data of 25 montane mammal species were used to explore the interactions between historical and ecological processes affecting local and regional diversity patterns. Multivariate analyses, such as non-metric dimensional scaling, were used to explore factors which influence community composition. Results of these analyses revealed the Colorado River as a significant biogeographic barrier that affects montane mammal community structure. MtDNA cytochrome b sequence variation was analyzed among populations of the long-tailed vole, Microtus longicaudus, sampled from five interior ranges of the Colorado Plateau- Abajo, LaSal, Henry, and Chuska Mts., and Boulder Mountain of the Aquarius Plateau-and analyzed using traditional phylogenetic approaches (parsimony and likelihood) as well as nested clade analysis. Results support previous documentation of a major east-west phylogeographic break occurring between populations southeast of the Colorado River (eastern Arizona, Colorado, Wyoming and New Mexico) and all other western populations, which …
Date: May 2004
Creator: Carr, Carla B.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Bouzouki Abstraction

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Recording of Colin Black's Bouzouki Abstraction. This work explores the abstract connections between the traditional Greek bouzouki instrument and the constructs of music, heritage, and physical structures displaced in time. This is a bilingual piece that includes text performed in both English and Greek. Musically, this work combines electroacoustic composition, sound art, synthesis, harmonic singing samples, spoken word, and the traditional bouzouki instrument.
Date: 2004
Creator: Black, Colin
Object Type: Sound
System: The UNT Digital Library

Brownian Movement and Quantum Computers

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This problem in lieu of thesis is a discussion of two topics: Brownian movement and quantum computers. Brownian movement is a physical phenomenon in which the particle velocity is constantly undergoing random fluctuations. Chapters 2, 3 and 4, describe Brownian motion from three different perspectives. The next four chapters are devoted to the subject of quantum computers, which are the signal of a new era of technology and science combined together. In the first chapter I present to a reader the two topics of my problem in lieu of thesis. In the second chapter I explain the idea of Brownian motion, its interpretation as a stochastic process and I find its distribution function. The next chapter illustrates the probabilistic picture of Brownian motion, where the statistical averages over trajectories are related to the probability distribution function. Chapter 4 shows how to derive the Langevin equation, introduced in chapter 1, using a Hamiltonian picture of a bath with infinite number of harmonic oscillators. The chapter 5 explains how the idea of quantum computers was developed and how step-by-step all the puzzles for the field of quantum computers were created. The next chapter, chapter 6, discus the basic quantum unit of information …
Date: December 2004
Creator: Habel, Agnieszka
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Callus Development and Organogenesis in Cultured Explants of Cowpea (Vigna unguiculata (L.) Walp

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Cowpea, Vigna unguiculata (L.) Walp is an excellent source of protein, vitamins and minerals and a major food crop many parts of Africa. Optimal production levels are hampered by insect pests and diseases. Biotechnological techniques such as tissue culture and genetic engineering can aid in the development of varieties with resistance to insect pests and diseases. The objective of this study was to investigate conditions necessary for the development of a reproducible tissue culture system that can be applied to regenerate transformed cells from culture. The in vitro manipulation of cowpea using Murashige and Skoog (MS) medium, auxins and cytokinins resulted in the formation of callus and rhizogenesis. Calli that were formed were separated into six classes based on color and texture. Yellowish friable callus, yellowish compact, soft yellowish callus and green and white were composed of largely vacuolated cells and were non-regenerative. Friable green callus was the most prevalent callus type and could form of roots in some hormone combinations. Green spots were formed on hard compact green callus. The green spots became nodular, forming root primordia and ultimately giving rise to roots. None of the six calli types gave rise to the formation of shoots. Embryogenic callus was …
Date: December 2004
Creator: Omwenga, George Isanda
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Carbon Nanotube/Microwave Interactions and Applications to Hydrogen Fuel Cells.

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One of the leading problems that will be carried into the 21st century is that of alternative fuels to get our planet away from the consumption of fossil fuels. There has been a growing interest in the use of nanotechnology to somehow aid in this progression. There are several unanswered questions in how to do this. It is known that carbon nanotubes will store hydrogen but it is unclear how to increase that storage capacity and how to remove this hydrogen fuel once stored. This document offers some answers to these questions. It is possible to implant more hydrogen in a nanotube sample using a technique of ion implantation at energy levels ~50keV and below. This, accompanied with the rapid removal of that stored hydrogen through the application of a microwave field, proves to be one promising avenue to solve these two unanswered questions.
Date: May 2004
Creator: Imholt, Timothy James
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Cave Songs (re)mix

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Recording of Daniel Matej's Cave Songs (re)mix. This work was concieved mainly as a "next step" from the sound installation, Caves, which the composer had made with Tibor Szemző in 2004. Many of the used and non-used sounds from that installation were used to create this work. The work as a whole contains 5 separate pieces titled: 1. gospel, 2. blues, 3. de profundis, 4. sex, and 5. ho-chi-min. The composer gives thanks to Mr. Richard Sabo for his technical assistance as well as Jan Boleslav Kladivo for the 'artistic accompaniment'.
Date: 2004
Creator: Matej, Daniel, 1963-
Object Type: Sound
System: The UNT Digital Library

City of Denton Municipal Solid Waste Characterization and Management Strategies

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Due to concern about diminishing landfill space, the City of Denton contracted a municipal solid waste characterization study in 1999 that would identify materials for diversion. This paper describes the results of 5 1-week waste sorting events, a scale-house analysis, a recycling participation study, a recycler profile and a similar city study. The results of the characterization studies suggest that at least 50% of each waste stream is recyclable or divertible though paper products accounted for no more than 45% by weight of any waste stream. Curbside recycling participation rate was 71% during the 6-week study period though the average weekly set-out rate was 37%. Recycling participation rates varied significantly by zip code and by home value categories but not by gender. Denton is fairly progressive in its waste management approach when compared to demographically similar cities on a 15-question assessment though recommendations for improvement have been identified.
Date: May 2004
Creator: Brady, Patricia D.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Claremont Connections

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Claremont Connections is a collection of fictional short stories about the relationships between the generations of women in one family and their friends.
Date: August 2004
Creator: Elerson, Crystal L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Concerto a VII Clarini con Tymp.

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Johann Ernst Altenburg has been called «the last representative of the heroic guild of trumpeters and timpanists.» Born in Weissenfels on June 15, 1734, he was apprenticed to his father Johann Caspar Altenburg (1689-1761) at the tender age of two and released from his articles as a trumpeter sixteen years later. ...
Date: 2004
Creator: Altenburg, Johann Ernst & Bauguess, Barry
Object Type: Text
System: The UNT Digital Library

The Confederate Pension Systems in Texas, Georgia, and Virginia: The Programs and the People

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The United States government began paying pensions to disabled Union veterans before the Civil War ended in April 1865. By 1890 its pension programs included any Union veteran who had fought in the Civil War, regardless of his financial means, as well as surviving family members, including mothers, fathers, brothers, and sisters. Union veterans did not hesitate to "wave the bloody shirt" in their attempts to liberalize pension laws. Pension programs for Confederate veterans were much slower to develop. Lacking any higher organization, each southern state assumed the responsibility of caring for disabled and/or indigent Confederate veterans and widows. Texas began paying Confederate pensions in 1899, Georgia in 1888 and Virginia in 1889. Unlike Texas, Georgia and Virginia provided artificial limbs for their veterans long before they started paying pensions. At the time of his enlistment in the 1860s, the typical future pensioner was twenty-five years of age, and fewer than half were married heads of households. Very few could be considered wealthy and most were employed in agriculture. The pensioners of Georgia, Texas, and Virginia were remarkably similar, although there were some differences in nativity and marital status. They were all elderly and needy by the time they asked …
Date: December 2004
Creator: Wilson, Mary L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Contested Policy: The Rise and Fall of Federal Bilingual Education in the United States, 1960-2001

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Bilingual education is one of the most contentious and misunderstood educational programs in the country. It raises significant questions about this country’s national identity, the nature of federalism, power, ethnicity, and pedagogy. In Contested Policy , Guadalupe San Miguel, Jr., studies the origins, evolution, and consequences of federal bilingual education policy from 1960 to 2001, with particular attention to the activist years after 1978, when bilingual policy was heatedly contested. Traditionally, those in favor of bilingual education are language specialists, Mexican American activists, newly enfranchised civil rights advocates, language minorities, intellectuals, teachers, and students. They are ideologically opposed to the assimilationist philosophy in the schools, to the structural exclusion and institutional discrimination of minority groups, and to limited school reform. On the other hand, the opponents of bilingual education, comprised at different points in time of conservative journalists, politicians, federal bureaucrats, Anglo parent groups, school officials, administrators, and special-interest groups (such as U.S. English), favor assimilationism, the structural exclusion and discrimination of ethnic minorities, and limited school reform. In the 1990s a resurgence of opposition to bilingual education succeeded in repealing bilingual legislation with an English-only piece of legislation. San Miguel deftly provides a history of these clashing groups and …
Date: March 15, 2004
Creator: San Miguel, Guadalupe, Jr.
Object Type: Book
System: The UNT Digital Library

A Country With No Name

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A Country With No Name is a collection of thirty-four poems with a preface explaining the style and influences of the author. The preface defends plain-language techniques in poetry, using W.H. Auden, Wislawa Szymborska, and Paul Simon as examples of poets who take a similar approach. The poems range in topic from personal and familial to societal and abstract. The main subjects encompass interpersonal relationships, romantic and otherwise, and larger concerns, such as the effects of war and modern lifestyles.
Date: May 2004
Creator: Hunziker, April
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Culturing Vallisneria americana for Restoration Efforts

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Robust Vallisneria americana was cultured for restoration purposes. Preliminary studies, with various iron treatments, were conducted to ascertain the amount of phosphorous release into the water column from sediments. There was a significant difference in the amount of phosphorous released if commercial sediment was used with a low iron amendment or without an iron amendment. The second study consisted of planting V. americana on two different sediment types while supplying half of the plants with additional CO2. Plants grown on pond sediment with additional CO2 had significantly more biomass. In the third study all plants were grown on pond sediment, and half were treated with CO2. All plants that were treated with additional CO2 had significantly more biomass than those that were aerated.
Date: May 2004
Creator: Tanski, Erin M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Cyanide Assimilation in Pseudomonas Fluorescens: Characterization of Cyanide Oxygenase as a Pterin-Dependent Multicomponent Enzyme Complex

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Cyanide utilization in Pseudomonas fluorescens NCIMB 11764 occurs via oxidative conversion to carbon dioxide and ammonia, the latter satisfying the nitrogen requirement. Substrate attack is initiated by an enzyme referred to as cyanide oxygenase (CNO), previously shown to require components in both high (H) (>30 kDa) and low (L) (<10 kDa) molecular weight cell fractions. In this study, tetrahydrobiopterin (H4biopterin) was identified as a cofactor in fraction L, thus making CNO appear as a pterin- dependent hydroxylase. CNO was purified 150-fold (specific activity 0.9 U/mg) and quantitatively converted cyanide to formate and ammonia as reaction products. When coupled with formate dehydrogenase, the complete enzymatic system for cyanide oxidation to carbon dioxide and ammonia was reconstituted. CNO was found to be an aggregate of known enzymes that included NADH oxidase (Nox), NADH peroxidase (Npx), cyanide dihydratase (CynD) and carbonic anhydrase (CA). A complex multi-step reaction mechanism is proposed in which Nox generates hydrogen peroxide which in turn is utilized by Npx to catalyze the oxygenation of cyanide to formamide accompanied by the consumption of one and two molar equivalents of oxygen and NADH, respectively. The further hydrolysis of formamide to ammonia and formate is thought to be mediated by CynD. The …
Date: May 2004
Creator: Fernandez, Ruby
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Design of Power Amplifier Test Signals with a User-Defined Multisine

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Cellular radio communication involves wireless transmission and reception of signals at radio frequencies (RF). Base stations house equipment critical to the transmission and reception of signals. Power amplifier (PA) is a crucial element in base station assembly. PAs are expensive, take up space and dissipate heat. Of all the elements in the base station, it is difficult to design and operate a power amplifier. New designs of power amplifiers are constantly tested. One of the most important components required to perform this test successfully is a circuit simulator model of an entire communication system that generates a standard test signal. Standard test signals 524,288 data points in length require 1080 hours to complete one test of a PA model. In order to reduce the time taken to complete one test, a 'simulated test signal,' was generated. The objective of this study is to develop an algorithm to generate this 'simulated' test signal such that its characteristics match that of the 'standard' test signal.
Date: May 2004
Creator: Nagarajan, Preeti
Object Type: Thesis or Dissertation
System: The UNT Digital Library