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An inquiry into the factors influencing the development of the field of Behavior Disorders: A qualitative approach
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This dissertation has explored the origins of the field of Behavioral Disorders via a qualitative approach. In order to collect data, interviews were conducted with respondents who were selected via purposeful sampling. All respondents have had a significant impact on the field of special education as evidenced by scholarship and leadership throughout their careers. Data analysis of the interview transcriptions was accomplished through the utilization of computer software. The data indicated six areas/topics that were seen among respondents as being significant to the development of the field of Behavioral Disorders.
Date:
August 2000
Creator:
Menendez, Anthony L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Psychological and Sociodemographic Predictors of Psychological Distress in BRCA1 and BRCA2 Genetic Testing Participants within a Community Based Genetic Screening Program
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Mutations in BRCA1 and BRCA2, the first two breast cancer susceptibility genes identified, carry as much as an 85% lifetime risk of developing breast, ovarian or other cancers. Genetic testing for mutations in these two genes has recently become commercially available. There have been varying amounts of psychological distress noted among women with a family history of breast cancer. Distress has been observed to impact psychological functioning, activities of daily living, and the practice of breast cancer surveillance behaviors. Within the genetic screening process, psychological distress has been shown to impact the decision to undergo genetic screening, the comprehension and retention of risk assessment information, as well as affecting the subject following the receipt of the genetic test results. Little work has been done to examine predictors of distress within at risk subjects. This study examines psychological distress among 52 community women presenting for BRCA1 and BRCA2 genetic mutation testing. Predictors of distress included family cancer history, education, age, Ashkenazi ethnicity, and Internality and Powerful Others Health Locus of Control. Vulnerable sub-groups of patients include younger women, women with higher levels of education and women of Ashkenazi ethnicity.
Date:
August 2000
Creator:
Lesniak, Karen
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Prevalence of Undiagnosed Dissociative Disorders in an Inpatient Setting
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This study examined the prevalence of undiagnosed dissociative disorders in a sample of 201 adult patients admitted to a private psychiatric hospital in a major metropolitan city in the south-central United States, over an eight-month period. A screening measure, two blind structured interviews, and a blind clinical interview were employed. The lifetime prevalence of dissociate disorders among the interviewed subjects was 40.8%. More specifically, 7.5% were diagnosed with dissociative identity disorder, 15.4% with dissociative disorder not otherwise specified, 13.4% with dissociative amnesia, and 4.5% with depersonalization disorder. Dissociative fugue was not found in this sample. Cohen's kappa reliability coefficients were computed between the three interview measures, resulting in significant findings for the presence of dissociative identity disorder and dissociative disorder not otherwise specified versus no dissociative disorder. The Cohen's kappa reliability coefficients were as follows: DDIS-DES-T = 0.81; SCID-D-DES-T = 0.76; Clinician-DES-T = 0.74, DDIS-SCID-D = 0.74; DDIS-Clinician = 0.71, and SCID-D-Clinician = 0.56. A meeting was conducted at the end of all subject interviews to discuss discrepant findings between measures. Four additional sub-analyses were performed between dissociative and non-dissociative subjects on DSM-IV variables. Patients diagnosed with a dissociative disorder had higher rates of comorbid major depressive disorder, borderline personality …
Date:
August 2000
Creator:
Duffy, Colleen
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Comparative Analysis of Chronic Versus Acute Stressors and Their Influence on Distress Consequences at Work
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Workplace stress has been found to be a causal agent of psychological distress consequences in employees. Chronic stressors have been well researched, in particular, role conflict, role ambiguity, and work overload have been extensively studied. A meta-analysis was conducted in order to aggregate past research to gain a better understanding of the impact these stressors have on the psychological distress consequences of depression, tension/anxiety, somatic complaints, and generalized feelings of stress. Only role ambiguity was found to be a significant contributor to psychological distress, in particular to feelings of depression and stress. In general, however, effect sizes for all three stressors were moderate to large. While chronic stressors have been well researched, acute stressors have been widely overlooked. Since research in this area is limited, the Daily Work Hassles Survey was developed and validated in order to analyze the role daily hassles play in the workplace. The survey yielded two factors, Interpersonal Hassles and Task Hassles. The former of which was found to be significantly related to the distress consequences of depression, tension/anxiety, somatic complaints, and general feelings of stress. The ultimate goal of this project was to compare chronic and acute stressors. Results from the daily hassles study were …
Date:
August 2000
Creator:
Crawford, Julie Schwarz
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Young-Jo Lee's Variations on the theme of Baugogae: In search of his own language, a lecture recital, together with three recitals of selected works of J. Haydn, S. Rachmaninoff, R. Schumann, O. Messiaen, and F. Liszt
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The objective of the dissertation is to examine Young-Jo Lee's (b. 1943) musical language as exhibited in his piano composition, Variations on the theme of Baugogae. Subjects of discussion include Lee's use of direct and indirect musical borrowings from past European composers and traditional Korean folk idioms. Also included are a biographical sketch of the composer and historical overview of modern Korean composers. This dissertation investigates Lee's effort to synthesize traditional Korean music and Western music in one art form and ultimately, to create his own musical language.
Date:
May 2000
Creator:
Kwon, Suk-Rahn
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Conformational Studies of Myosin and Actin with Calibrated Resonance Energy Transfer
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Resonance energy transfer was employed to study the conformational changes of actomyosin during ATP hydrolysis. To calibrate the technique, the parameters for resonance energy transfer were defined. With conformational searching algorithms to predict probe orientation, the distances measured by resonance energy transfer are highly consistent with the atomic models, which verified the accuracy and feasibility of resonance energy transfer for structural studies of proteins and oligonucleotides. To study intramyosin distances, resonance energy transfer probes were attached to skeletal myosin's nucleotide site, subfragment-2, and regulatory light chain to examine nucleotide analog-induced structural transitions. The distances between the three positions were measured in the presence of different nucleotide analogs. No distance change was considered to be statistically significant. The measured distance between the regulatory light chain and nucleotide site was consistent with either the atomic model of skeletal myosin subfragment-1 or an average of the three models claimed for different ATP hydrolysis states, which suggested that the neck region was flexible in solution. To examine the participation of actin in the powerstroke process, resonance energy transfer between different sites on actin and myosin was measured in the presence of nucleotide analogs. The efficiencies of energy transfer between myosin catalytic domain and actin …
Date:
May 2000
Creator:
Xu, Jin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Sorry Guard
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Sorry Guard is a collection of poems with a critical introduction on poetic form. Form in poetry can be revealed vocally (how the poem sounds), temporally (how the poem makes use of time), and spatially (how the poem is visualized, both physically on the page due to typography and imagistically due to the shape and movement of its subject matter). In this preface, I will address these three aspects of form in relation to three distinct twentieth century poets: Robert Hass, W.S. Merwin, and W.H. Auden. I am most interested in how particular formal decisions shape meaning and value in poetry. My aesthetic approach here primarily dwells on what Helen Vendler calls, "the music of what happens." The urgency of Robert Hass's spoken word is important to me because I wish to make poems that should be spoken aloud and remembered. While W.S. Merwin's rejection of punctuation is not my own aesthetic outlook, I strive to achieve through close attention to temporal form the mythic voice of his poemsthe immediacy of his lines and images, especially in his second four books. And Auden's deft use of spatial form is only a small aspect of his remarkable verse. All three poets …
Date:
May 2000
Creator:
Poch, John
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Study of Graphically Chosen Features for Representation of TREC Topic-Document Sets
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Document representation is important for computer-based text processing. Good document representations must include at least the most salient concepts of the document. Documents exist in a multidimensional space that difficult the identification of what concepts to include. A current problem is to measure the effectiveness of the different strategies that have been proposed to accomplish this task. As a contribution towards this goal, this dissertation studied the visual inter-document relationship in a dimensionally reduced space. The same treatment was done on full text and on three document representations. Two of the representations were based on the assumption that the salient features in a document set follow the chi-distribution in the whole document set. The third document representation identified features through a novel method. A Coefficient of Variability was calculated by normalizing the Cartesian distance of the discriminating value in the relevant and the non-relevant document subsets. Also, the local dictionary method was used. Cosine similarity values measured the inter-document distance in the information space and formed a matrix to serve as input to the Multi-Dimensional Scale (MDS) procedure. A Precision-Recall procedure was averaged across all treatments to statistically compare them. Treatments were not found to be statistically the same and …
Date:
May 2000
Creator:
Oyarce, Guillermo Alfredo
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Online Academic Support Model for Students Enrolled in Internet-Based Classes
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This doctoral dissertation describes a research study that examined the effectiveness of an experimental Supplemental Instruction (SI) program that utilized computer-mediated communication (CMC) rather than traditional SI review sessions. During the Spring 1999 semester, six sections of an introductory computer course were offered via the Internet by a suburban community college district in Texas. Using Campbell and Stanley's Nonequivalent Control Group model, the online SI program was randomly assigned to four of the course sections with the two remaining sections serving as the control group. The students hired to lead the online review sessions participated in the traditional SI training programs at their colleges, and received training conducted by the researcher related to their roles as online discussion moderators. Following recommendations from Congos and Schoeps, the internal validity of the groups was confirmed by conducting independent t-tests comparing the students' cumulative credit hours, grade point averages, college entrance test scores, and first exam scores. The study's four null hypotheses were tested using multiple linear regression equations with alpha levels set at .01. Results indicated that the SI participants earned better course grades even though they had acquired fewer academic credits and had, on average, scored lower on their first course …
Date:
May 2000
Creator:
Rockefeller, Debra J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Exogenous Influences and Paths To Activism
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The focus of this research was to ascertain the indirect effects upon activism of intervening variables and recognized exogenous influences upon activism. In addition, this research also focused upon the differences and similarities of a recruited activist model and spontaneous activist model. Regression and path analysis were used to measure the direct and indirect effects of the exogenous and intervening variables. This research found that when the intervening variables, political interest, political awareness, exposure to media, altruism, and self-interest were introduced to both the recruited and spontaneous models, the direct effects of the variables were enhanced.
Date:
May 2000
Creator:
Ray, Grady Dale
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Work-family responsiveness in organizations: The influence of resource dependence and institutionalization on program adaptation
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Changes in workforce demographics, employee sentiments, and working conditions have increased attention on employees' needs to balance the demands of work life and family life. Despite apparent growing interest among companies to be responsive to these needs, the number of companies demonstrating high levels of work-family responsiveness is relatively small. The frameworks of resource dependence theory and institutional theory were used to develop a model to explain differences in work-family responsiveness among for-profit companies. The theoretical models were tested on survey data collected through a stratified random sample of 692 for-profit companies. The data were further enhanced with secondary data sources. While the institutional model explained more variance in work-family responsiveness than the resource dependence model, a model combining both theories best explains work-family responsiveness among for-profit companies. High industry-region diffusion of family-friendly benefits was one of several strong predictors of work-family responsiveness. Also, the greater the proportion of professionals in a company's industry, the greater was the level of work-family responsiveness. Companies that measured effectiveness outcomes were more likely to offer family-friendly benefits. The same was true for companies with more positive assessments regarding the impact of their family-friendly benefits. Organizations that were large, publicly traded, or had human …
Date:
May 2000
Creator:
Ruggiere, Paul
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Virginia Carter Smith: Her Career and Contributions to Advancement in Higher Education
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Most research studies of women in the college and university advancement profession measure the number of women in advancement positions, report their corresponding salaries and reflect on the differences between male and female employees in the same position. Little research explores how women achieve high ranking advancement positions and very few provide an analysis of the characteristics, influences and careers of successful female advancement professionals. This dissertation describes the life and work of Virginia Carter Smith, founding editor of the Council for Advancement and Support of Education's award winning publication CURRENTS. The career and contributions of Virginia Carter Smith are relevant and helpful to advancement professionals in colleges, universities and K-12 institutions. This study explores Smith's formative years as a child, describes her educational and extra-curricular preparation and identifies individuals who influenced her life and provided direction for her future. It also examines Smith's role in the formation and direction of CASE and CURRENTS. Smith successfully launched CURRENTS in 1975 when few women held senior-level positions in advancement-related fields. With Smith's contributions, CASE became the dominate professional organization for advancement professionals working in educational institutions, and CURRENTS continues to be an exemplary professional development periodical for individuals working in advancement. …
Date:
May 2000
Creator:
Russell, Kimberly A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effects of an Oral History Interview on Counselor Trainees' Confidence and Couples' Intimacy
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A major concern many counselor trainees face when preparing to see their first couple-client is that of confidence because they have had little to no experience in interacting in a professional capacity with couples. Many beginning counselors experience anxiety, which can inhibit their effectiveness with clients (Scanlon & Baille, 1994). Introducing counselor trainees to a relatively non-threatening interaction with couples might reduce the initial anxiety that characterizes the neophyte counselor venturing into new clinical territory. The interaction may also enhance feelings of warmth and closeness of the couples. John Gottman's Oral History Interview (Gottman, 1999) was the protocol used in the interaction between trainee and couple. An instrument developed for this study to measure couple counseling confidence, the State Trait Anxiety Inventory (Spielberger, 1983), and the Personal Assessment of Intimacy in Relationships (Schaefer & Olson, 1981) were used to assess levels of counselor confidence, counselor anxiety, and couple intimacy, respectively. The confidence instrument and State-Trait Anxiety Inventory were administered to 37 students who were enrolled in four graduate level introductory couple counseling classes and who interviewed couples, as well as to 34 counselor-trainees who were enrolled in five graduate level counseling courses other than couple counseling and who did not …
Date:
May 2003
Creator:
Toler, Jane K.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Nightingale in Poetry and Music
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This thesis surveys a variety of songs and arias for high soprano which feature the nightingale; examines the musical elements that symbolize, refer to, or imitate the nightingale; and compares these musical elements with transcriptions of the nightingale's song. The first chapter reviews the symbolic development of the nightingale and its role in poetry and literature. The interior chapters address a selection of musical compositions that feature the nightingale and its song. The final chapter establishes a relationship between the sound of the actual sound of the nightingale and the musical gestures created by composers to imitate the nightingale.
Date:
May 2003
Creator:
Blizzard, Amy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
London, Ankara, and Geneva: Anglo-Turkish Relations, The Establishment of the Turkish Borders, and the League of Nations, 1919-1939
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This dissertation asserts the British primacy in the deliberations of the League of Nations Council between the two world wars of the twentieth century. It maintains that it was British imperial policy rather than any other consideration that ultimately carried the day in these deliberations. Given, as examples of this paramountcy, are the discussions around the finalization of the borders of the new republic of Turkey, which was created following the collapse of the Ottoman Empire at the end of the First World War. These discussions focused on three areas, the Mosul Vilayet or the Turco-Iraqi frontier, the Maritza Delta, or the Turco-Greek frontier, and the Sanjak of Alexandretta or the Turco-Syrian frontier.
Date:
August 2002
Creator:
Stillwell, Stephen J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
When "The Lie Becomes Truth": Four Historiographic Novels of the Twentieth Century
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This dissertation is an exploration of relationships between fiction and history as illuminated by historiographic fiction in general and the historiographic novel in particular. Here the term historiography is employed particularly in several of its many meanings: as the study of the materials and techniques of history, the study of what it means to be a historian, and the study of the philosophy of history. All of these are comprehended in the larger definition of issues pertaining to the writing of history. Four twentieth-century novels are presented and analyzed as historiographic novels. The common element in analysis of all the novels is the examination of historiographic material encoded in narrative, plot, characters, theme, structure or style. Each analysis focuses on one historiographic assumption or problem and brings in perspectives of historians or theorists of history as well as non-novelistic, critical perspectives of the authors themselves. E. M. Forster's Howards End (1910) is analyzed as an imaginative exposé of causality in historical thinking. All the King's Men by Robert Penn Warren (1946) is presented as a gloss on Isaiah Berlin's critique of Leo Tolstoy's second epilogue to War and Peace. Several essays by philosopher Eric Voegelin provide the theoretical framework for …
Date:
December 1999
Creator:
Detels, Polly Elizabeth
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
East Meets West: Nationalistic Elements in Selected Piano Solo Works of Chen Yi
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Since the founding of "New China" in 1949, the musical culture has undergone numerous periods of identity crisis, particularly during the ten-year "Cultural Revolution," due to the fact that music had always been used to serve the needs of political propaganda. Even the development of a "National Style" encouraged by the central government was a political "brainchild" under the socialist ideology. Nevertheless, professional musicians struggled to create a new path in musical composition while walking on the thin ice of harsh political climate. Isolated from the rest of the world for almost two decades, China's musical development had not been able to keep pace with the world until the late 1970s, when the central government reevaluated its agenda on how to lead the country. This change of political environment eventually led to a more open society. The newly established contact with the outside world in the musical scene lent great opportunities for Chinese musicians to study the newest thinking about music, which ultimately, in the early 1980s, fostered the emergence of a new "National Style"- the so-called "New Wave." The style of "New Wave" differs drastically from the earlier "National Style" in that it employs primarily twentieth-century compositional techniques in …
Date:
August 2001
Creator:
Li, Songwen
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Tone Clock: Peter Schat's System and an Application to His Etudes for Piano and Orchestra, Opus 39
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The scope of this study includes relevant background information on Peter Schat and his compositions and process, an explanation of the Tone Clock system and a detailed analysis of one of his compositions, the Etudes for Piano and Orchestra, Opus 39. The intent is to demonstrate how the Tone Clock naturally evolved from the practices of the Second Viennese School and how it relates to both new and existing modern music. The study is divided into five chapters. Chapter 1 presents a brief introduction to Peter Schat and the Tone Clock. Chapter 2 provides a more detailed biography of Peter Schat and traces the development and evolution of his compositional techniques, ultimately culminating in the Tone Clock. Chapter 3 provides a basic explanation of the Tone Clock itself, with demonstrations of various components through musical examples and illustrations. Chapter 4 is a detailed analysis of the Etudes for Piano and Orchestra, Opus. 39. Chapter 5 summarizes the results of the study, with special attention to the impact of the Tone Clock on performance from the perspective of the performer. The analysis of the Etudes was completed by using the Tone Clock as an analytical tool, aided by the composer's original …
Date:
December 2002
Creator:
Petrella, Diane Helfers
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Richard Thompson Archer and the Burdens of Proprietorship: The Life of a Natchez District Planter
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In 1824 a young Virginia aristocrat named Richard Thompson Archer migrated to Mississippi. Joining in the boom years of expansion in the Magnolia State in the 1830s, Archer built a vast cotton empire. He and his wife, Ann Barnes, raised a large family at Anchuca, their home plantation in Claiborne County, Mississippi. From there Richard Archer ruled a domain that included more than 500 slaves and 13,000 acres of land. On the eve of the Civil War he was one of the wealthiest men in the South. This work examines the life of Richard Archer from his origins in Amelia County, Virginia, to his death in Mississippi in 1867. It takes as its thesis the theme of Archer's life: his burdens as proprietor of a vast cotton empire and as father figure and provider for a large extended family. This theme weaves together the strands of Archer's life, including his rise to the position of great planter, his duties as husband and father, and his political beliefs and activities. Archer's story is told against the background of the history of Mississippi and of the South, from their antebellum heyday, through the Civil War, and into the early years of Reconstruction. …
Date:
December 2001
Creator:
Hammond, Carol D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Faculty and Doctoral Recital: 2013-11-26 - Julia Bushkova, violin and Arsentiy Kharitonov, piano
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A faculty and doctoral student recital performed at the UNT College of Music Voertman Hall.
Date:
November 26, 2013
Creator:
Bushkova, Julia & Kharitonov, Arsentiy
Object Type:
Sound
System:
The UNT Digital Library
Scripture for America: Scriptural Interpretation in John Locke's Paraphrase
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Is John Locke a philosopher or theologian? When considering Locke's religious thought, scholars seldom point to his Paraphrase and Notes on the Epistles of St. Paul. This is puzzling since the Paraphrase is his most extensive treatment of Christian theology. Since this is the final work of his life, did Locke undergo a deathbed conversion? The scholarship that has considered the Paraphrase often finds Locke contradicting himself on various theological doctrines. In this dissertation, I find that Locke not only remains consistent with his other writings, but provides his subtlest interpretation of Scripture. He is intentionally subtle in order to persuade a Protestant audience to modern liberalism. This is intended to make Protestantism, and specifically Calvinism, the vehicle for modern liberalism. This is seen clearly in Max Weber's The Protestant Ethic and the Spirit of Capitalism. Though Weber concludes that Protestant support for capitalism in the late 19th Century is due to its theological foundation, I find that Weber is actually examining Lockean Protestantism. Locke's success in transforming Protestantism is also useful today in showing how a modern liberal can converse with someone who actively opposes, and may even wish to harm, modern liberalism. The dissertation analyzes four important Protestant …
Date:
August 2016
Creator:
Kearns, Kevin M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Computational Studies of Catalysis Mediated by Transition Metal Complexes
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Computational methods were employed to investigate catalytic processes. First, DFT calculations predicted the important geometry metrics of a copper–nitrene complex. MCSCF calculations supported the open-shell singlet state as the ground state of a monomeric copper nitrene, which was consistent with the diamagnetic character deduced from experimental observations. The calculations predicted an elusive terminal copper nitrene intermediate. Second, DFT methods were carried out to investigate the mechanism of C–F bond activation by a low-coordinate cobalt(I) complex. The computational models suggested that oxidative addition, which is very rare for 3d metals, was preferred. A π–adduct of PhF was predicted to be a plausible intermediate via calculations. Third, DFT calculations were performed to study ancillary ligand effects on C(sp3)–N bond forming reductive elimination from alkylpalladium(II) amido complexes with different phosphine supporting ligands. The dimerization study of alkylpalladium(II) amido complexes indicated an unique arrangement of dative and covalent Pd-N bonds within the core four-membered ring of bimetallic complexes. In conclusion, computational methods enrich the arsenal of methods available to study catalytic processes in conjunction with experiments.
Date:
May 2019
Creator:
Jiang, Quan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Who is Who in Zimbabwe's Armed Revolution? Representation of the ZAPU/ZIPRA and the ZANU/ZANLA in High School History Textbooks Narratives of the Liberation War
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The liberation war was a watershed event in the history of Zimbabwe. According to the ZANU PF (Zimbabwe African National Union Patriotic Front) ruling elites, an understanding of the common experiences of the people during the liberation war provides the best opportunity to mold a common national identity and consciousness. However, the representation of important historical events in a nation's history is problematic. At best events are manipulated for political purposes by the ruling elites, and at the worst they are distorted or exaggerated. In Zimbabwe, the representation of the ZAPU/ZIPRA and the ZANU/ZANLA as liberation movements in high school history textbooks during the armed struggle is a hot potato. This study critically examined and explored the contested "representational practices" of the ZAPU/ZIPRA and the ZANU/ZANLA as liberation movements during the Zimbabwean armed revolution. By means of qualitative content analysis, seven high school history textbooks from Zimbabwe were analyzed. Drawing from postcolonial perspectives and insights, particularly Fanon's concept of the pitfall of national consciousness, the study unveiled the way in which Zimbabwean high school textbooks portrayed the ZAPU/ZIPRA and the ZANU/ZANLA as very different liberation movements whose roles and contributions were unequal. High school textbooks depicted the ZANU/ZANLA as a …
Date:
May 2019
Creator:
Sibanda, Lovemore
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Praseodymium Oxide and Organic Modified Cerium Oxide Nanoparticles for Electrodeposition of Nickel-Ceramic Nanocomposites to Enhance Corrosion Protection and Mechanical Properties
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There is a consistent need in many industries, especially oil and gas, to develop coatings which have higher corrosion resistance and better hardness to extend the lifetime of equipment when it is exposed to hostile environments. Electrodeposition has been a favorable method in the synthesis of metal coatings because of its low cost, convenience, ability to work at low temperatures, and ability to control surface morphology and structure. The inclusion of ceramic nanoparticles in metal matrix composites has previously been investigated as a technique to not only increase the corrosion resistance of the native metal but also to improve the hardness and mechanical properties. Cerium oxide nanoparticles were modified through the grafting of organic groups with increasing hydrophobicity for use in nickel coatings on stainless steel to further improve the corrosion properties while maintaining the hardness of the nanocomposite coatings. The process of modifying the cerium oxide nanoparticles involved the use of aryl diazonium salts and resulted in multilayers forming on the surface of the nanoparticles. Praseodymium oxide nanoparticles were also investigated as additives to nickel coatings, since praseodymium oxide has not yet been studied as a possible corrosion protection enhancement in coatings. These coatings were evaluated for composition and …
Date:
May 2019
Creator:
Sanders, Stephen
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library