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Photoelectric Emission Measurements for CVD Grown Polycrystalline Diamond Films
We examined CVD grown polycrystalline diamond films having different methane concentrations to detect defects and study the possible correlation between the methane concentration used during the growth process and the defect density. SEM and Raman results show that the amorphous and sp2 carbon content of the films increases with methane concentration. Furthermore, photoelectric emission from diamond is confirmed to be a two-photon process, hence the electrons are emitted from normally unoccupied states. We found that the photoelectric yield, for our samples, decreases with the increase in methane concentration. This trend can be accounted for in two different ways: either the types of defects observed in this experiment decrease in density as the methane concentration increases; or, the defect density stays the same or increases, but the increase in methane concentration leads to an increase in the electron affinity, which reduces the overall photoelectric yield. digital.library.unt.edu/ark:/67531/metadc2199/
Photographic metaphors: A multiple case study of second language teachers' experiences using the acquisition model.
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The purpose of this study was to examine and document second language teachers' perceptions of their implementation of a meaning-making approach, known as the Acquisition Model, to second language instruction. Of particular focus were the concerns and strategies the second language teachers experienced when changing their pedagogical practice from mechanical to meaning making. The main research question, which guided this study, was: "What is the 'lived experience' of L2 teachers as they implement an innovative pedagogy to teach a second language?" The researcher addressed this research question through Max van Manen's (1990) six step phenomenological method, "Researching Lived Experience" and image-based research techniques (i.e., photo elicitation and reflexive photography). In addition, the researcher also created and applied an innovative data collection technique, which she called Collaborative Imagery. Findings from this study generated various implications in the areas of second language education, curricular change, teacher reflection, image-based research, and educational research. digital.library.unt.edu/ark:/67531/metadc5229/
The Photolysis of Ethyllithium and Triethylaluminum
The majority of interest in organolithium and organoaluminum compounds has centered around their potency as polymerization catalysts. digital.library.unt.edu/ark:/67531/metadc164375/
Photophysical properties of pyrene, 2,7 diazapyrene and 1,3-bis(β-naphthyl)propane.
The luminescence properties of Van Der Waals' dimers and clusters of pyrene and diazapyrene have been investigated. Excimers, dimeric species which are associative in an excited electronic state and dissociative in their ground state, have long been established and play an important role in many areas of photochemistry. My work here focuses on the luminescence and absorption properties of ground state dimers/aggregates, which are less understood, and allows further characterization of the ground state and excited state association of these aromatic molecules. digital.library.unt.edu/ark:/67531/metadc3999/
Photophysical studies of silver(I), platinum(II), palladium(II), and nickel(II) complexes and their use in electronic devices.
This dissertation deals with two major topics that involve spectroscopic studies of (a) divalent group 10 metals and (b) silver(I)-phosphine complexes. The scope of the work involved the delineation of the electronic structure of these complexes in different environments and their use in electronic devices. The first topic is a look at the luminescence of tetrahedral silver(I)-phosphine complexes. Broad unstructured emissions with large Stokes shifts were found for these complexes. Computational analysis of the singlet and triplet state geometries suggests that this emission is due to a Jahn-Teller type distortion. The second topic represents the major thrust of this research, which is an investigation into the electronic structure of M(diimine)X2 (M= Pt(II), Pd(II), or Ni(II); X = dichloro, or dithiolate ligands) complexes and their interactions with an electron acceptor or Lewis acid. Chapter 3 assesses the use of some of these complexes in dye sensitized solar cells (DSSCs); it is shown that these complexes may lead to a viable alternative to the more expensive ruthenium-based dyes that are being implemented now. Chapter 4 is an investigation into donor/acceptor pairs involving this class of complexes, which serves as a feasibility test for the use of these complexes in organic photo-voltaics (OPVs) and thin-film field-effect transistors (OTFTs). The mixing of a donor Pt molecule with an electron deficient nitrofluorenone gives rise to new absorption bands in the NIR region. Computational studies of one of the solids suggest that these complexes may have metallic behavior. Chapter 5 demonstrates association in solution, previously unobserved, for Pt(diimine)Cl2 complexes. This chapter is an investigation into the effects of the association mode for this class of complexes on the absorption and emission properties. One of the complexes was used as the emitter in organic light emitting diodes (OLEDs). The results of this study show that these complexes have tunable absorption and emission energies that are concentration dependant. The concentration dependence of the absorption and emission energies is utilized in the OLED device where association enhances the performance. digital.library.unt.edu/ark:/67531/metadc5165/
Photophysics and Photochemistry of Copper(I) Phosphine and Collidine Complexes: An Experimental/Theoretical Investigation
Copper(I) complexes have been studied through both experimental and computational means in the presented work. Overall, the work focuses on photophysical and photochemical properties of copper(I) complexes. Photophysical and photochemical properties are found to be dependent on the geometries of the copper(I) complexes. One of the geometric properties that are important for both photochemical and photophysical properties is coordination number. Coordination numbers have been observed to be dependent on both ligand size and recrystallization conditions. The complexes geometric structure, as well as the electronic effects of the coordination ligands, is shown both computationally as well as experimentally to affect the emission energies. Two-coordinate complexes are seen to have only weak emission at liquid nitrogen temperature (77 K), while at room temperature (298 K) the two-coordinate complexes are not observed to be luminescent. Three-coordinate complexes are observed to be luminescent at liquid nitrogen temperature as well as at room temperature. The three-coordinate complexes have a Y-shaped ground (S0) state that distorts towards a T-shape upon photoexcitation to the lowest lying phosphorescent state (T1). The geometric distortion is tunable by size of the coordinating ligand. Luminescence is controllable by limiting the amount of non-radiative emission. One manner by which non-radiative emission is controlled is the amount of geometric distortion that occurs as the complex undergoes photoexcitation. Bulky ligands allow for less distortion than smaller ligands, leading to higher emission energies (blue shifted energies) with higher quantum efficiency. Tuning emission and increasing quantum efficiencies can be used to create highly efficient, white emitting materials for use in white OLEDS. digital.library.unt.edu/ark:/67531/metadc84199/
Photoreactivation Studies on Azotobacter vinelandii ATCC 12837
This thesis was written to study photoreactivation in different physiological conditions of the vegetative cell as well as the photoreactivation of the two morphological states of the Azotobacter cell: the vegetative cell and the cyst. digital.library.unt.edu/ark:/67531/metadc163932/
Photosynthesis
Encyclopedia article entry in the Encyclopedia of Time: Science, Philosophy, Theology, and Culture by H. James Birx. This encyclopedia article discusses photosynthesis. digital.library.unt.edu/ark:/67531/metadc287055/
The Phototropic Properties of Lactuca Ludoviciana (Nutt.) DC. and Silphium Laciniatum L.
This paper deals with certain phases of phototropic properties of two exceptional plants, the pertinent behavior of each being decidedly individualistic and in remarkable contrast to that of herbaceous plants in general. The prickly lettuce, Lactuca ludoviciana (Nutt.) DC. and the rosinweed, Silphium laciniatum L., two common Denton County, Texas, plants, have been selected for this study. digital.library.unt.edu/ark:/67531/metadc75308/
Physical activity and its association with selected dietary behaviors
This study examined the association between level of physical activity and changes in dietary behaviors of 3,945 employees after a 10-week work-site physical activity program. Fifty-seven percent of the participants met the CDC/ACSM standard for physical activity sufficient for a health benefit. Physical activity was not significantly related to increased fruit and vegetable consumption, decreased dietary fat and calorie intake, and participants acquiring new nutrition skills. Physical activity was negatively associated with increased food label awareness. Participants who exercised sufficient for a health benefit were less likely to increase their food label awareness. Physical activity and dietary behaviors are generally not associated. Interventions to improve these behaviors should be behavior-specific. digital.library.unt.edu/ark:/67531/metadc2910/
A Physical and Chemical Investigation of Eagle Mountain Lake with Reference to Biological Productivity
The purpose of this investigation is to attempt by correlation of chemical-physical factors to ascertain if any one of the necessary features might act as a factor limiting growth and reproduction of either plants or animals. The body of water used in this investigation is Eagle Mountain Lake, a reservoirs approximately five years of age. digital.library.unt.edu/ark:/67531/metadc29930/
Physical and Functional Characterization of the xy1XYZ Region From TOL Plasmid pDK1 and its Associated Downstream Regulatory Elements
The nucleotide sequence for the pDKl TOL plasmid region encoding toluate-1,2-dioxygenase (Xy1XYZ, TO) was determined. TO is the first enzyme in the meta-cleavage operon, responsible for the conversion of toluates and benzoates to their carboxy-substituted diols. DNA sequence analysis revealed the presence of three open reading frames (ORF). The three ORFs correspond to xylX (1353 bp), xylY (486 bp) and xylZ (1008 bp), encoding predicted protein products of 51370 Da, 19368 Da and 36256 Da, respectively. digital.library.unt.edu/ark:/67531/metadc278036/
The Physical, Chemical, and Biological Factors Contributing to Algae Blooms in Fresh-Water Reservoirs
The purpose of this investigation is to attempt to relate the distribution and periodicity of the plankton to the variations in the biological, chemical, and physical factors. digital.library.unt.edu/ark:/67531/metadc83493/
Physical Education as an Element in the Personal and Social Readjustment of the Problem Child in Gladewater, Texas
This study of the readjustment of problem children was undertaken as an integral part of the physical education program of the city schools of Gladewater, Texas, to determine if physical education in itself is, or can become, a positive factor in reshaping the lives of such children. digital.library.unt.edu/ark:/67531/metadc75444/
Physical Gesture, Spatialization, Form and Transformation in Watershed I/IV, for Solo Percussion and Real-time Computer Spatialization, by Roger Reynolds
Watershed I/IV, for Solo Percussion and Real-time Computer Spatialization was composed in 1995 by Pulitzer prize-winning composer Roger Reynolds. This work is a 25-minute choreographed music drama for one multiple-percussionist, in which Reynolds incorporates the musical transformation of percussion instrument families, the physical gestures of the performer, and the spatialization of processed sounds around the audience. This dissertation addresses several aspects of Watershed, which include: the expressive intent and extra-musical concepts; the formal organization, and several non-musical tools that Reynolds utilized in designing the piece (e.g. logarithmically derived sequences); the primary musical motives; the instrument setup and how the resulting physical gestures contribute to the musical intent; and the real-time computer spatialization. Throughout the document, specific musical passages are demonstrated with notated musical examples and embedded video/audio clips. In addition, transcripts of my interviews with composer Roger Reynolds, percussionist Steven Schick (premiere performer of Watershed) and engineer/technician Greg Dixon (engineer for my performances of Watershed IV) are also included. digital.library.unt.edu/ark:/67531/metadc12153/
Physical-Layer Network Coding for MIMO Systems
The future wireless communication systems are required to meet the growing demands of reliability, bandwidth capacity, and mobility. However, as corruptions such as fading effects, thermal noise, are present in the channel, the occurrence of errors is unavoidable. Motivated by this, the work in this dissertation attempts to improve the system performance by way of exploiting schemes which statistically reduce the error rate, and in turn boost the system throughput. The network can be studied using a simplified model, the two-way relay channel, where two parties exchange messages via the assistance of a relay in between. In such scenarios, this dissertation performs theoretical analysis of the system, and derives closed-form and upper bound expressions of the error probability. These theoretical measurements are potentially helpful references for the practical system design. Additionally, several novel transmission methods including block relaying, permutation modulations for the physical-layer network coding, are proposed and discussed. Numerical simulation results are presented to support the validity of the conclusions. digital.library.unt.edu/ark:/67531/metadc68065/
Physical Map between Marker 8O7 and 146O17 on the Medicago truncatula Linkage Group 1 that Contains the NIP Gene
The Medicago truncatula NIP gene is located on M. truncatula Linkage Group 1. Informative recombinants showed crossovers that localize the NIP gene between markers 146O17 and 23C16D. Marker 164N9 co-segregates with the NIP gene, and the location of marker 164N9 is between markers 146O17 and 23C16D. Based upon data from the Medicago genome sequencing project, a subset of the model legume Medicago truncatula bacterial artificial chromosomes (BACs) were used to create a physical map on the DNA in this genetic internal. BACs near the potential NIP gene location near marker 164N9 were identified, and used in experiments to predict the physical map by a BAC-by-BAC strategy. Using marker 164N9 as a center point, and chromosome walking outward, the physical map toward markers 146O17 and 23C16D was built. The chromosome walk consisted of a virtual walk, made with existing sequence of BACs from the Medicago genome project, hybridizations to filters containing BAC DNA, and PCR reactions to confirm that predicted overlapping BACs contained DNA that yielded similar PCR products. In addition, the primers which are made for physical mapping via PCR could be good genetic markers helpful in discovering the location of the NIP gene. As a result of efforts repotted here, gap in physical map between marker 164N9 and 146O17 was closed. digital.library.unt.edu/ark:/67531/metadc5152/
Physical Motivation and Methods of Solution of Classical Partial Differential Equations
We consider three classical equations that are important examples of parabolic, elliptic, and hyperbolic partial differential equations, namely, the heat equation, the Laplace's equation, and the wave equation. We derive them from physical principles, explore methods of finding solutions, and make observations about their applications. digital.library.unt.edu/ark:/67531/metadc277898/
The Physical, Social and Scholastic Attainments of Forty-Two Athletes and Forty-Two Non-Athletes in the High School, Bonham, Texas
The purpose of this study was to make a comparison of the mental, the physical, and the social attainments of forty-two athletes and forty-two non-athletes during a nine-months period in the Senior High School in Bonham, Texas. digital.library.unt.edu/ark:/67531/metadc83426/
A Physiological Age-Grading System for Female Hydrellia pakistanae Deonier (Diptera: Ephydridae)
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Conflicting opinions about the effectiveness of H. pakistanae as a biological control agent for hydrilla prompt researchers to find a method for assessing the fly's success. Developing a physiological age-grading system for the fly using ovarian morphology to detect changes in reproductive activity is useful for evaluating reproductive status of the fly in field populations. Changes in the appearance of follicular relics in ovaries with oviposition provide a reliable method to estimate fecundity. Characteristics of follicular relics were used to develop a system with eight physiological age classes, three nulliparous and five parous. Changes that occur in the fat body were used to assist in classification of nulliparous females or those with low egg counts. digital.library.unt.edu/ark:/67531/metadc3280/
Physiological and Verbal Responses to Erotic Visual Stimuli in a Female Population
In recent years, there has been a growing acceptance of sexual behavior as a legitimate area of research. An impetus for research utilizing erotic visual stimuli was supplied by the Presidential appointment of the Commission on Obscenity and Pornography (1963). Research into the effects of erotic visual stimuli has typically employed male subjects (Neiger, 1966). The paucity of adequate research has not been a deterrent to the formulation of strong opinions regarding the nature of female sexuality. The present research has focused on female responses to visual representations of the nude male figure. digital.library.unt.edu/ark:/67531/metadc131584/
The Physiological Effect of Colored Background on One's Ability to See Colors
This study is an attempt to understand if backgrounds with color impact physiology and the ability of a viewer to see color. digital.library.unt.edu/ark:/67531/metadc33237/
The physiology of collaboration: An investigation of library-museum-university partnerships.
Collaboration appears to be a magical solution for many problems when there is scarcity of resources, lack of knowledge or skills, and/or environmental threats. However, there is little knowledge about the nature of collaboration. A holistic conceptual framework was developed for the collaborative process, and the conceptualization process used systems thinking approach. The author has selectively chosen conceptualizations and/or research by a limited subset of scholars whose ideas appeared to be the most relevant and useful to explore the type of collaboration studied here. In other words, the selection of the literature was based on an eclectic selection. Multiple cases were used in this research to understand the factors that are components of collaborative effort among non-profit organizations and the relationships among those factors. This study also investigated the stages of collaborative process. Data were collected from 54 participants who were partners in collaborate projects funded by the Institute of Museum and Library Services (IMLS). Among these 54 participants, 50 answered the online questionnaire and 38 received the telephone interviews. The data collected was analyzed using cluster analysis, multidimensional scaling, internal consistency reliability, and descriptive statistics. The component factors of collaboration were grouped by the following seven concepts: trustworthiness, competence, dependency, misunderstanding and/or conflict, complexity, commitment and mechanism of coordination. This study showed twelve relationships among these factors. For instance, different points of view and partners' capacity to maintain inter-organizational relationships were found to be opposite concepts. In addition, the findings in this study indicate that 84% of participants reported the presence of the five pre-defined stages: execution, networking, definition, relationship, and common evaluation. digital.library.unt.edu/ark:/67531/metadc4303/
The Piano as an Orchestra: The Accompanist and the Twentieth-Century Orchestral Reduction
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The musical developments of the 20th century have expanded the role of the accompanist. As the compositional output of our time increases, and the opportunity to perform as soloist with an orchestra diminishes, piano reductions of an orchestral score are becoming the most frequent vehicle for concerto performances of twentieth and twenty-first century instrumental literature. While the current state of research provides solid support to many accompanists, it is in the area of instrumental accompanying, especially with regard to the challenges of playing a reduction of an orchestral score with an instrumental soloist, that the lack of discourse becomes strikingly evident. It is the goal of this study to provide the instrumental accompanist with concrete, practical approaches and considerations in order to perform an orchestral reduction in a manner consistent with the integrity of the score. Problems such as identifying the represented orchestral instruments, delineating importance of musical lines, and basic uses and misuses of pedal, articulation, and rubato are discussed. The pianist is led through ways of deciphering and negotiating specific passages, in order to guide the accompanist through the possible pitfalls and challenges unique to many orchestral reductions. By focusing on twentieth century reductions, providing examples of problems and discussing ways to solve them, the pianist will able to apply these to any reduction encountered, not just those specifically illustrated here. These basic principles of discerning common problems and appropriately reconciling them are then applied in a more advanced form to Robert Nelson's Concertino for Baritone Saxophone (1996). Through commentary from the composer, and a comparison of the orchestral score to the reduced piano score, the accompanist will explore detailed techniques of performing this work in a manner that upholds the original “orchestral” intent of the music. digital.library.unt.edu/ark:/67531/metadc3178/
Piano Concerto No. 4 in D Minor, Op. 70 by Anton Rubinstein: An analytical and historical study.
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Anton Rubinstein was primarily recognized as one of the greatest pianists of his time. However, Rubinstein yearned for recognition as a composer and worked prodigiously to realize that goal. Unfortunately, Rubinstein's works were virtually unknown today. One of Rubinstein's finest compositions, the Piano Concerto in D Minor, op. 70 has been the most frequently performed. It is one of the first "Russian" concertos that was written by a Russian composer, and was performed in Russian concert halls instead of the homes of Russian aristocracy. It is also considered the most successful and harmonious convergent of various musical styles which influenced Rubinstein. However, there is no formal, detailed analysis of the Concerto in the entire music literature. Therefore, the main purpose of this dissertation is to provide a thorough study of the Concerto from an analytical and historical standpoint. Rubinstein was also one of the most eminent educators in Russia. The St. Petersburg Conservatory of Music, which Rubinstein helped found in 1862, has to this day produced some of the most influential musicians in Russia. The other purpose of this dissertation is to evaluate Rubinstein's role as music educator. An overview of Rubinstein's works for piano and orchestra offers a general idea of his compositional style. Literature on Anton Rubinstein currently available is limited. The two most valuable primary sources are Rubinstein's Autobiography of Anton Rubinstein, and Rubinstein's A Conversation on Music. Jeremy Norris's The Russian Piano Concerto, Volume I: The Nineteenth Century provides an insightful but short analysis on the Concerto. Sources discussing Anton Rubinstein as a pianist and an educator are relatively plentiful. Larry Sitsky's Anton Rubinstein: Annotated Catalog of Piano Works and Biography is an excellent work on Rubinstein's piano works. This dissertation includes four chapters: Chapter 1 - Introduction Chapter 2 - Rubinstein's works for piano and orchestra Chapter 3 - Piano Concerto No. 4 in D Minor, Op. 70 Chapter 4 - Conclusion. digital.library.unt.edu/ark:/67531/metadc5569/
Piano Quintet
The thesis is a traditional piano quintet in the manner of Bartok, incorporating compositional techniques such as golden ratio and using folk materials. Special effects on strings are limited for easy conversion to wind instruments. The piece is about 15 minutes long. digital.library.unt.edu/ark:/67531/metadc277681/
Piano-related Musculoskeletal Disorders: Posture and Pain
A healthy posture protects the body-supporting functions and prevents injuries by maintaining balance. Literature in performing arts medicine suggests that posture is an important component to prevent piano-playing related injuries. However, no known research studies have quantified, characterized, and compared pianists' sitting postures. The purpose of this study was to explore the relationship between playing postures and perceived pain among pianists. This study applied innovative approach using qualitative and quantitative methods, combined with three-dimensional motion captured technology. To examine risk factors related pianists' postures, three-dimensional motion-capture cameras recorded approximate 40 pianists' postures in various situations; data recordings were combined with a statistical method to investigate pain-posture correlations. Results reveal that the degrees of head-neck or body tilt angles are the tendency of risk factors for piano-playing related pain. Results from this study may have multiple practical implications among which are: (1) a risk factor pain, injury index, or indicator (2) a performance habits profile and (3) practice guide to prevention of piano-playing related musculoskeletal disorders. digital.library.unt.edu/ark:/67531/metadc271895/
The Piano Variations of Aaron Copland: An Analysis and Study for the Performer.
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Aaron Copland has been in the forefront of the American musical scene since the 1920s. He has been called an "American composer" for his ability to formulate the essence of American folk music into a wide variety of mediums. The variety and scope of his compositions encompass a diverse array of styles and techniques. From the jazz influenced works that dominated his early period to the works for Hollywood films, from the chamber music that was directly influenced by his Jewish background to the partial acceptance of serial technique, Copland has managed to delve equally into all these styles. Yet, one could arguably rank his works for the stage as his most popular and generally most successful compositions of his career. The extent to which the American public has accepted these works as being "folk" is a case for the genius and adaptability of Copland's talent. Although works like Appalachian Spring, Rodeo, and Lincoln Portrait command the attention of the general public, of whom Aaron Copland was constantly aware, there are works for the piano that deserve and demand close study by pianists. One such work is the Piano Variations. Written in 1930, it has been acknowledged as a twentieth century masterpiece in publications for piano and piano literature as well as by pianists since its premiere in 1931. It is a brutal and sparse work that encompasses a quasi-serial technique in which the motto of four notes transforms itself through the course of twenty variations and a coda. The demands of learning a work such as this can be overwhelming for the pianist not accustomed to the rigors of a non-diatonic piece. However, a careful analysis precipitated by specific questions directed not only at learning the piece but also with the goal of performance in mind, can shape the interpretational issues that will eventually face the pianist. The questions that I pose are directly pulled from Michael Remson's article, "Copland's Piano Variations: A Forgotten Masterpiece." Although it is considered by this writer as an introduction to the technique of serialism, largely because of the classical practices among which are tonal center, period structure and interruptions of the motto, Copland's Piano Variations is a classic example of a twentieth century work that will be heard as avant-garde and studied in the style of late Romanticism. digital.library.unt.edu/ark:/67531/metadc5529/
The Picaresque Novel in America since World War II
This is not intended to be a definitive study of all the picaresque novels of the last two decades. It is, instead, a representative study which includes those authors who have attained the most prominence and who have contributed most to the delineation and advancement of the picaresque genre. digital.library.unt.edu/ark:/67531/metadc130638/
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/
Pictures of Charlotte: The Illustrated Charlotte Temple and Her Readers
Article on the illustrated Charlotte Temple and her readers. digital.library.unt.edu/ark:/67531/metadc97934/
Pieter Bruegel the Elder's Apocalyptic Fortitude
This thesis examines Pieter Bruegel the Elder's Fortitude, 1560, a print from the Seven Virtues series. Fortitude stands out as an anomaly within the cycle because it contains several allusions to the Book of Revelation. The linkage of Fortitude to the writings of St. John is important because it challenges previous iconographic and iconological analyses of the composition. Analysis of Fortitude's compositional elements is provided, along with an examination of the virtue tradition. Additionally, an exploration of sixteenth-century apocalypticism is included, as well as an examination of the artistic influences that may have inspired Bruegel. This thesis concludes that Fortitude's apocalyptic allusions do not seem unusual for an artist familiar with St. John's prophecies, influenced by Hieronymus Bosch, and living in an age of apocalypticism. digital.library.unt.edu/ark:/67531/metadc278210/
Piezoresistive Polyvinylidene Fluoride/Carbon Filled Nanocomposites
This thesis examines the value of using dispersed conductive fillers as a stress/strain sensing material. The effect of the intrinsic conductivity of the filler on the ability to be effective and the influence of filler concentration on the conductivity are also examined. To meet these objectives, nanocomposites of polyvinylidene fluoride (PVDF) with carbon nanofibers (CNFs) and carbon nanotubes (CNTs) were prepared by melt-blending using a twin screw extruder. Since PVDF has a potential to be piezoresistive based on the type of crystalline phase, the effect of CNFs on PVDF crystallinity, crystalline phase, quasi static and dynamic mechanical property was studied concurrently with piezoresponse. Three time dependencies were examined for PVDF/CNTs nanocomposites: quasi-static, transient and cyclic fatigue. The transient response of the strain with time showed viscoelastic behavior and was modeled by the 4-element Burger model. Under quasi-static loading the resistance showed negative pressure coefficient below yield but changed to a positive pressure coefficient after yield. Under cyclic load, the stress-time and resistance-time were synchronous but the resistance peak value decreased with increasing cycles, which was attributed to charge storage in the nanocomposite. The outcomes of this thesis indicate that a new piezoresponsive system based on filled polymers is a viable technology for structural health monitoring. digital.library.unt.edu/ark:/67531/metadc68059/
Pilgrim Carnival
This thesis explores an experimental music approach to writing autobiography. As a composition, Pilgrim Carnival took place as a travelling series of events. The central event was a sound installation for a blindfolded audience. This essay is a description of that series of events as well as a discussion of similar precedents in interdisciplinary art. Beginning with Luigi Russolo and Marcel Duchamp, aspects of autobiography are examined in both noise music and the concept of the ready-made artwork. Body Art of the 1970s, particularly the work of Marina Abramovic, is also tied into the idea of the ready-made artwork as an explicitly autobiographical example. The hybrid form of Pilgrim Carnival and the concept of ready-made autobiographical music create ongoing potential for new work. digital.library.unt.edu/ark:/67531/metadc3246/
Pilot of a Learning Management System to Enhance Counselors' Relational Qualities Through Mindfulness-based Practices
Mindfulness-based practices are associated with increased attentional qualities, improved self-focus styles, enhanced empathic understanding, and strengthened self-compassion, making these practices a viable addition to counselor training programs. However, current mindfulness training models are primarily designed for relief of psychological distress, stress reduction, and increased well-being rather than focused on enhancing therapeutic skills and require intensive time commitments that may present logistical difficulties for overburdened curricula and graduate students. This study piloted an on-line, eight-week mindfulness-based practices learning management system for counselors (MBLMS-C) with a specific focus on the cultivation of qualities associated with successful therapeutic relationships. Ten of forty-six recruited counseling master's students enrolled in their first basic skills course at a sample of accredited universities across the United States completed the exit survey. Data were analyzed using multivariate repeated measures analyses comparing pre- post- counselor relational qualities of mindfulness traits, empathy, self-focus style, and self-compassion. Results indicated no statistically significant difference with a partial ?2 = .73. What-if analyses (N = 30) indicated statistical significance may have been obtained given a larger sample. Variance was explained by increased self-compassion (partial ?2 = .34) and mindfulness traits (partial ?2 = .31) and decreased self-focus style rumination (partial ?2 = .23) and empathic personal distress (partial ?2 = .12). Changes were observed in the desired direction for self-focus style reflection and empathic perspective taking/empathic concern. Discussion includes a review of the findings including examination of participant feedback regarding training experience. Study limitations and implications for counselor education, professional enhancement, and suggestions for future research are also offered. digital.library.unt.edu/ark:/67531/metadc271776/
The Pink Papers
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The Pink Papers is a collection of three short stories and a novel in progress consisting of four chapters. Each piece is a work of original fiction. The preface addresses the female writer and the female voice in fiction. "Broken Clock" and "Pink Paper" are the stories of two girls coping with endometriosis. "Normal Capacity" looks at the loss of a dream through the eyes of a first-year law student. The novel in progress, titled Blanchard, OK, is set in a rural farming town in Oklahoma. The novel tells the stories of 24-year-old Robin, her Aunt Paula, and Paula's boyfriend, Sam. digital.library.unt.edu/ark:/67531/metadc4270/
Piracy on the Ground: How Informal Media Distribution and Access Influences Cultures in Contemporary Hanoi, Viet Nam
This thesis explores how pirate cultures and “informal” distribution circuits operate on the ground level and integrate global media texts (mainly Hollywood films) into a small section of the local everyday society of Hanoi, Viet Nam. Situating the pirate stores and its components as active and central, this thesis will examine the physical flow of media through these store sites. In addition, by exploring the interactions between media texts, store owners and workers, customers, and the store’s design itself, this thesis will reveal how media piracy (as a form of distribution and “normal” access) influences and negotiates modernity, cultures, identities, and meanings in Hanoi and Viet Nam. digital.library.unt.edu/ark:/67531/metadc149675/
The Place of Office Practice in the High School
A study to determine if the commercial department is providing business men with adequate training. digital.library.unt.edu/ark:/67531/metadc75293/
The Place of Special Drawing Rights in World Monetary Reform
The purpose of this study is to account for the forces that led to the creation of Special Drawing Rights (SDRs), to examine the operation of the Special Drawing Account, to account for the developments inducing monetary reform, and to arrive at conclusions concerning the future of SDRs in the international financial system. digital.library.unt.edu/ark:/67531/metadc164076/
The Place of the Napoleonic Myth in The Red and the Black
The problem contained in this study was Stendhal's use of the Napoleonic myth in his novel The Red and the Black. This study dealt primarily with Stendhal's purpose in using the myth as a basis for his novel and with the extent to which the principal character, Julien Sorel, patterned himself after the myth. digital.library.unt.edu/ark:/67531/metadc131371/
A Place to Call Home: A Study of the Self-Segregated Community of Tatums, Oklahoma, 1894-1970
This study examines Tatums, Oklahoma, under the assumption that the historically black towns (HBT) developed as a response to conditions in the South. This community provides a rich example of the apparent anomalies that the environment of self-segregation created. Despite the widespread violence of the Klan, the residents of the HBTs were not the targets of lynching or mob violence. During the years after World War II, Tatums residents enjoyed the greatest prosperity. The final chapter looks at the battle Tatums' residents fought to keep their school from being closed after the state of Oklahoma began to enforce the Brown v. Board of Education decisions in the 1960s. Their solidarity during the desegregation transition remained powerful enough for them to negotiate compromises regarding the fair treatment of their children in a world that was integrating around them. digital.library.unt.edu/ark:/67531/metadc4842/
Placement in the prekindergarten bilingual and English as a second language programs as a predictor of reading achievement of 3rd grade students.
At the beginning of the 21st century, few challenges for educators compared to that of meeting the academic needs of the growing number of limited English proficient (LEP) students. Divergent views on whether those needs were best met through instruction in the student's first language and English, known as bilingual education, or instruction solely in English, compounded the challenge and led to varied language support programs. The present study looked at the prekindergarten (preK) language support program as a predictor of 3rd grade reading achievement of students with the intention of helping educators understand how best to serve LEP students. The study included an analysis of 3rd grade reading achievement for four groups of students with a primary home language of Spanish who attended bilingual or ESL prekindergarten. Multivariate analysis of variance (MANOVA) followed by descriptive discriminant analysis (DDA) was used to analyze scores from the Iowa Tests of Basic Skills (ITBS) reading test and the Texas Assessment of Knowledge and Skills (TAKS) reading test. No statistically significant difference in 3rd grade reading achievement was found among the four groups at the .05 level. There was, however, a small-to-medium effect size. The MANOVA indicated that the group to which the students belonged accounted for 5.5% of the variance in their scores. The DDA revealed the ITBS explained most of the difference in the group performance. The findings suggest that ESL instruction is a viable option to bilingual instruction for LEP preK students. digital.library.unt.edu/ark:/67531/metadc4680/
Placement Service for Graduates of the Schools of Business Administration
The purpose of this study is to find the extent of and manner in which placement service is being performed by the schools of business of colleges and universities for their graduates, and to make recommendations for the organization and physical set-up of an adequate placement service for the School of Business Administration of North Texas State College. digital.library.unt.edu/ark:/67531/metadc53586/
A Plan for Adequate Guidance in Small Secondary Schools
The underlying purpose of this thesis is to provide the best possible guidance for students in small secondary schools. The plan will consider the limitations which exist in small secondary schools. It is not the ideal plan, but the necessarily practical plan which this thesis will attempt. digital.library.unt.edu/ark:/67531/metadc70380/
A Plan for Improving the Health, Physical Education, and Intramural Program for Boys in West Columbia High School
The purpose of this study is to develop plans for a program in health education, physical education and intramural sports for boys in the West Columbia High School, West Columbia, Texas. digital.library.unt.edu/ark:/67531/metadc75616/
A Plan for Improving the Physical-Education Program for Boys in the Port Neches Junior High School
The purpose of this study is to formulate recommendations for the improvement of the program in health and physical education for boys in the Port Neches, Texas, Junior High School. digital.library.unt.edu/ark:/67531/metadc83592/
A Plan for Modernization of a Small Manufacturing Firm
The purpose of this study was to analyze the operational equipment in current use at the Marshall Pottery Company and make a comparison of this equipment and modern, up-to-date equipment available and in use by other manufacturers. An attempt was made to formulate a long-range plan for developing and modernizing basic production processes and facilities at the Marshall Pottery Company. digital.library.unt.edu/ark:/67531/metadc108069/
A Plan of Christian Higher Education for Arkansas Baptists
The primary problem in this study was to develop a comprehensive long-range plan for Arkansas Baptists to use as a guide in meeting their needs in the field of Christian higher education. These needs were viewed in two ways: 1. Need as related to the purposes and philosophy of Christian higher education of Southern Baptists; 2. Need as related to the number of persons to be served. digital.library.unt.edu/ark:/67531/metadc164106/
Plan Types and Their Effect on Retirement Patterns
In 1993, 38.9 million people were covered by a 401(k) plan, up from 7.1 million in 1983. The rapid growth of 401(k) and other defined contribution pension plans may alter retirement patterns of older workers. Previous research showed that the spread of defined benefit plans, with sharp age-related incentives first discouraging and later encouraging retirement, contributed to the early retirement trend of past decades. Defined contribution plans differ along several dimensions, especially in their smooth rate of pension wealth accrual. Data from the Health and Retirement Study show that retirement patterns have begun to change as defined contribution plans have spread. Estimates indicate that the financial incentives in defined benefit pensions lead people to retire almost two years earlier, compared to people with defined contribution plans. digital.library.unt.edu/ark:/67531/metadc4306/
Planar Lebesgue Measure
This thesis attempts to prove the Lebesgue measure is a concrete realization of measure. digital.library.unt.edu/ark:/67531/metadc83743/