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The Effects of a Therapeutic Play Intervention on Hispanic Students' Reading Achievement, Self-Concept, and Behavior
This study employed a pretest/posttest control group design to investigate the achievement of second grade Hispanic students from a predominantly low socio-economic school in a large metropolitan city. The thirty Hispanic students with the lowest scores on the Gates MacGinitie Reading Test were randomly assigned to the experimental group (n =15) or the control group (n=15). The treatment consisted of 16, 30-minute sessions of play intervention--2 times per week for 8 weeks. The providers of play therapy were school personnel trained in the principles of child-centered play therapy including tracking, reflecting feelings, and setting limits. Instruments were administered to all subjects prior to the 8 week treatment period and in the two-week period following treatment and included the GMRT, the Joseph Pre-School Primary Self-Concept Test (JPPSCST) and the Child Behavior Checklist Teacher Report Form (CBCTRF). Statistical analyses included a (t-test; 2 tail; p > .05), discriminant analysis, and cross validation. The results indicated that children who received play therapy did not achieve notably higher mean scores in reading. However, play therapy did improve the experimental group's self-concept scores and their internal behavior scores, though not significantly. All differences between the experimental and the control groups were within 1 point except …
Date:
December 2000
Creator:
Lopez, Helen Trevino
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Attitudes and Behaviors Toward Weight, Body Shape and Eating in Male and Female College Students
The purpose of this investigation was to assess the association between body mass index as well as race/ethnicity and established correlates of disordered eating including drive for thinness, body dissatisfaction, bulimia, dietary restraint and social physique anxiety in male and female college students. Difference between actual, desirable and perceived body weight was also assessed. ANOVA suggested that as actual body mass index increased, in general, attitudes and behavior toward weight, body shape and eating increased. A two-tailed t-test suggested that males and females differed significantly with regards to attitudes and behavior toward weight body shape and eating. ANOVA indicated that little to no association existed between race/ethnicity and established correlates of disordered eating.
Date:
December 2000
Creator:
Lofton, Stacy L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Teachers' and Students' Perceptions of the Impact of Content Literacy Strategy Instruction on Teaching and Learning
Reading researchers agree that content literacy strategies are beneficial in helping students learn. However, teachers remain resistant to teaching the strategies. Additionally, many students, even at the college level, lack the learning strategies necessary to experience academic success. This study sought to gain a deeper understanding of the complexities of content literacy strategy instruction. The research questions that guided the study addressed the benefits, obstacles, and support and experiences needed to sustain the use of the strategies over time. Multiple data sources were used to investigate teachers' and students' perceptions of the research questions. The main benefit found was increased student understanding and learning of content; additional benefits included increased instructional repertoire, increased student engagement in class, and improved learner independence. Most of the obstacles documented in the literature were supported in the study; however, the obstacle of time was noted most frequently. Teacher confidence was observed by the researcher as an obstacle. The majority of participants indicated they would continue using the strategies learned during the study in the future. Students noted the support needed to sustain content literacy strategy use depended on teachers providing direct instruction, practice using the strategies, and personal success with the strategies. Teachers also …
Date:
December 2000
Creator:
Maher, Sheila
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Singing for Blaine and for Logan! Republican Songs as Campaign Literature in the 1884 Presidential Race
During the presidential contest of 1884, Republicans used singing as a campaign tactic at rallies, meetings, and parades. Their songs may be divided into several categories, such as rally songs, songs of praise for the party and its candidate, "bloody shirt" songs, mudslinging songs, and issue-based songs. Songs provide a perspective on the overall tenor of the campaign, while a lack of songs on certain topics, such as temperance, reflects the party's reluctance to alienate voters by taking a strong stand on controversial issues. Although the campaign has often been called one of the dirtiest in American history, this negativity is not reflected in the majority of the songs.
Date:
December 2000
Creator:
Madding, Carol Ann
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The medicalization of oral aesthetics: an application of structuration theory
Medicalization has been discussed at length in the sociology of health and illness literature. Typically, dialogue has centered on the effects of medicalization and the process as a phenomenon in professional fields alone. This work is an attempt to study medicalization using a theoretical model, structuration, that allows for inclusion of the larger social system in understanding health system changes and to include consumers of health services in the process as active agents. The example of oral aesthetics provides an opportunity to identify the agents of change, the process of medicalization in the larger social context, and possible indicators of the phenomenon. An attempt to operationalize the complex concept of medicalization marks a move toward creating testable theoretical models for the variety of behaviors and conditions under study as medicalized. Using content analysis of professional dental journals and lay magazines and a review of system rules and resources, shifts in language use and the emergence of medical frameworks were documented to determine if a medicalization of oral aesthetics had occurred. Results show two distinct periods within the last century when oral aesthetics have been medicalized in the United States. Evidence of turn-taking behavior among the agents is noted as well …
Date:
December 2000
Creator:
Freeland, Lisa New
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Happiness Is a By-Product of Function: William Burroughs and the American Pragmatist Tradition
This dissertation examines the techniques and themes of William Burroughs by placing him in the American Pragmatist tradition. Chapter One presents a pragmatic critical approach to literature based on Richard Rorty and John Dewey, focusing on the primacy of narration over argumentation, redescription and dialectic, the importance of texts as experiences, the end-products of textual experiences, and the role of critic as guide to experience rather than judge. Chapter Two uses this pragmatic critical lens to focus on the writing techniques of William Burroughs as a part of the American Pragmatist tradition, with most of the focus on his controversial cut-up technique. Burroughs is a writer who upsets many of the traditional expectations of the literary writing community, just as Rorty challenges the conventions of the philosophical discourse community. Chapter Three places Burroughs within a liberal democratic tradition with respect to Rorty and John Stuart Mill. Burroughs is a champion of individual liberty; this chapter shows how Burroughs' works are meant to edify readers about the social, political, biological, and technological systems which work to control individuals and limit their liberties and understandings. The chapter also shows how Burroughs' works help liberate readers from all control systems, and examines the …
Date:
December 2000
Creator:
Goeman, James Robert
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Nativity Panel of Isenheim Altarpiece and its Relationship to the Sermo Angelicus of St. Birgitta of Sweden
This thesis explores the relationship of the Sermo Angelicus of St. Birgitta of Sweden, written in the fourteenth century, with the Nativity/Concert of Angels panel of the Isenheim Altarpiece, painted by Matthias Grunewald in 1514 for a hospital and monastery run by the Antonite Order. Taking into consideration the context of the altarpiece, this thesis analyzes its iconography in relation to specific passages from the Sermo Angelicus, suggesting that the text was a possible source used by the Antonites in the Nativity/Concert of Angels panel. By doing so, parallel themes of salvation in both the text and the panel are discovered that in turn relate to the altarpiece in its entirety and present a message fashioned specifically for those patients at the hospital at Isenheim that viewed the altarpiece.
Date:
December 2000
Creator:
Ritchie, Jennifer Ann
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Performance Measurement, Feedback, and Reward Processes in Research and Development Work Teams: Effects on Perceptions of Performance
Organizations have had difficulty managing the performance of their knowledge work teams. Many of these troubles have been linked to antiquated or inadequate performance management systems along with a scarcity of empirical research on this important human resource initiative. These problems are magnified when managing the performance of research and development teams because greater ambiguity and uncertainty exists in these environments, while projects are unique and continually evolving. In addition, performance management in R&D has only recently been accepted as important while individuals in these settings are often resistant to teams. This study represented the first step in the process of understanding relationships between performance management practices and perceptions of performance in R&D work teams. Participants were 132 R&D team leaders representing 20 organizations that agreed to complete a survey via the Internet. The survey instrument was designed to examine the relationships between performance measurement, feedback, and reward processes utilized by teams in relation to measures of customer satisfaction, psychological and team effectiveness, and resource utilization and development. The most important level of performance measurement occurred at the business unit level followed next by the individual level while team level measurement was unrelated to team performance. A simple measurement system …
Date:
December 2000
Creator:
Roberts, M. Koy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Relevance Thresholds: A Conjunctive/Disjunctive Model of End-User Cognition as an Evaluative Process
This investigation identifies end-user cognitive heuristics that facilitate judgment and evaluation during information retrieval (IR) system interactions. The study extends previous research surrounding relevance as a key construct for representing the value end-users ascribe to items retrieved from IR systems and the perceived effectiveness of such systems. The Lens Model of user cognition serves as the foundation for design and interpretation of the study; earlier research in problem solving, decision making, and attitude formation also contribute to the model and analysis. A self reporting instrument collected evaluative responses from 32 end-users related to 1432 retrieved items in relation to five characteristics of each item: topical, pertinence, utility, systematic, and motivational levels of relevance. The nominal nature of the data collected led to non-parametric statistical analyses that indicated that end-user evaluation of retrieved items to resolve an information problem at hand is most likely a multi-stage process. That process appears to be a cognitive progression from topic to meaning (pertinence) to functionality (use). Each step in end-user evaluative processing engages a cognitive hierarchy of heuristics that includes consideration (of appropriate cues), differentiation (the positive or negative aspects of those cues considered), and aggregation (the combination of differentiated cue aspects needed to …
Date:
December 2000
Creator:
Greisdorf, Howard F.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
"This Beautiful Evil": The Connection between Women, the Natural World, Female Sexuality, and Evil in Western Tradition
Female archetypes reflect a social construction of reality, expressing expected modes of behavior, beliefs, and assumptions about women and are reinforced by repetition of common patterns and themes. Often female archetypes take on the physical characteristics of animals, commune with nature, engage in sexual promiscuity, and possess special powers to bewitch and control men into doing their bidding. Four prevalent archetypes include: the Predatory Woman, who with her bestial nature becomes the hunter of men; the Sacrificial Woman, who dutifully negates herself for the sake of men; the Bad Mother, who is cold, unnatural, and challenges men; and les enfants terrible seductive girl-women who at once tempt and torment men. This research traces the development and evolution of female archetypes and explores how images of women, nature, sexuality, and evil are structured within a cultural framework of Western tradition: myths and folktales, religious, philosophical, and scientific works, and film.
Date:
December 2000
Creator:
Gregg, Gretchen Esely
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effect of Leadership Training on Manufacturing Productivity of Informal Leaders
The purpose of this study was to determine if leadership training, given to informal leaders, had a positive effect on manufacturing productivity. The leadership attributes of informal leaders were assessed using the Leader Attributes Inventory (LAI). Furthermore, the performance of informal leaders was measured using the Leader Effectiveness Index (LEI). Non-management employees from various departments in a manufacturing facility were placed in one of four experimental groups. A Solomon four-group experimental design was employed. A one-group pretest-posttest design was used to control threats to internal validity. The one-way analysis of variance procedure (ANOVA) was used to determine if there were statistically significant increases in manufacturing productivity of informal leaders. Findings suggested that training increased the manufacturing productivity of informal leaders. The increased productivity indicated that leadership training could help manufacturing facilities increase their productivity without capital expenditures. Findings did not indicate a statistically significant difference in leadership attributes. Findings also suggested there were no significant differences in the manufacturing productivity between employees with high leader attributes and low leader attributes. Based on this study, leadership training, given to non-management employees, may yield gains in manufacturing productivity.
Date:
December 2000
Creator:
Knox, Donald W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
AJ 00-1
This oil painting on canvas is predominately black and includes some white vertical scrapes starting and stopping horizontally in the center.
Date:
2000
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library
A Confirmatory Factor Analysis of WRAML Scores in a Group of Academically Talented Students
The purpose of this study was to confirm the original factor structure of the Wide Range Assessment of Memory and Learning (WRAML) utilizing a non-clinical adolescent population. Additional analysis examined the relationship between SAT-M scores and spatial relations ability. Exploratory analyses were conducted to determine ethnic and gender differences on the WRAML and subtests from the DAT. Sixty-four academically talented adolescents completed the WRAML and the mechanical reasoning and spatial relations subtests from the Differential Aptitude Test (DAT). The confirmatory factor analysis found the data obtained to not be a good fit for the factor structure of the WRAML (Sheslow & Adams, 1990). Additional confirmatory analyses were conducted which examined data fit of a three factor model found by reanalyzing the standardization data (Burton et al., 1996; Wasserman & Cambias, 1991) as well as two null models. The data failed to fit any of these three models. No support was found for the second hypothesis that predicted a positive relationship between SAT-M scores and spatial relations ability. Ethnic and gender differences on the WRAML and two DAT subtests were examined and discussed. Limitations of this study were reviewed which may have accounted for the overall lack of results.
Date:
December 2000
Creator:
Johnson, Patricia R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
AL 00-3
This abstract painting is mostly black with some white vertical scrapes.
Date:
2000
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library
Academic Dishonesty: Attitudes and Behaviors of Fundamentalist Christian College Students
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Use of this item is restricted to the UNT Community
This study was designed to examine: (1) the extent to which cheating occurs in fundamentalist Christian colleges; (2) the attitudes of fundamentalist Christian college students toward cheating; (3) attitudes of fundamentalist Christian college students toward cheating among their peers; (4) the kinds of cheating practices of fundamentalist Christian college students; (5) the degree to which students engage in neutralizing behavior to justify cheating; (6) differences in cheating behaviors according to gender; (7) differences in cheating behaviors according to ethnicity; and (8) differences in cheating behaviors according to the length of duration of Christian commitment. Based upon the responses of 337 students attending 3 different Christian colleges, it was concluded that: (1) most Christian fundamentalist students do not engage in cheating; (2) respondents believe that each of 17 self-reported cheating behaviors are serious forms of cheating; (3) respondents are unlikely to report cheating among peers; (4) plagiarism is the most common cheating behavior; (5) most respondents justify cheating on the basis of the workload at school and the pressure to obtain good grades; (6) there are no differences in cheating behavior according to gender; (7) there are differences in cheating behavior according to groups; and (8) most respondents do not cheat …
Date:
December 2000
Creator:
Sunday, William G.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Sarah T. Hughes: Her Influence in Texas Politics
Access:
Use of this item is restricted to the UNT Community
Conservative males traditionally dominated Texas politics. In 1930, however, Sarah T. Hughes, a liberal woman from Maryland, began a spectacular career in state politics despite obstacles because of her gender and progressive ideas. First elected to the Texas Legislature in 1930, she remained active in politics for the next fifty years. Hard work, intelligence, and ability allowed her to form solid friendships with Texas's most powerful politicians. She became the first woman in Texas to hold a district judgeship, the first woman from Texas appointed to the federal bench, and the only woman to swear in a U.S. president. Hughes profoundly influenced state politics, challenging the long-standing conservative male domination. She helped to create a more diverse political field that today encompasses different ideologies and both genders.
Date:
December 2000
Creator:
Justiss, Charnita Spring
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Alternative Information Processing Formats for Overcoming Information Processing Deficits in Senior Adults
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Use of this item is restricted to the UNT Community
The objective of this study was to examine the effectiveness of alternative advertising presentation formats, and the quantity of information presented in advertisements in overcoming possible information-processing deficits in senior adults that could affect their recall of ad attributes and brand name, the cognitive responses generated, and attitude toward the ad. In addition, the study examined the effectiveness of retirement status as a classification or segmentation variable in comparison with the use of the more traditional classification variable, chronological age. A convenience sample of senior adult volunteers from church groups, social clubs, and civic organizations from the local area were randomly assigned to one of nine experimental conditions. The experiment utilized a simulated magazine to test the effects of presentation formats (3 levels), and quantity of information (3 levels) on senior adult's recall, cognitive responses and attitude toward the test ads. Covariates (gender, wealth, education, activity level, health, and income) were used to reduce variance. The findings clearly indicate that the presentation format of the can ad adversely affected the memory of some senior adults. In addition, the results were significantly different across the different age levels. Retirement status was less beneficial than chronological age in the current study, but …
Date:
December 2000
Creator:
Muller, Lynn F.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Retention and Attrition of Doctoral Candidates in Higher Education
A number of studies have been conducted on the attrition rates of undergraduate and graduate students. However, the body of knowledge concerning attrition for doctoral students, especially those who have attained the level of “all but dissertation” (ABD), is limited. The purpose of this research was to examine retention and attrition factors of doctoral candidates from a typical Higher Education Doctoral Program (Research II Public Institution) who were admitted to candidacy from 1991 through July 2000. Participation of the subject population was limited to those who had attained the level of ABD--those who had previously fulfilled the residency, coursework, foreign language or tool-subject requirements, and successfully completed the comprehensive/qualifying exams. This population included current ABDs, previously attrited ABDs, and graduates of the degree program. The research study was qualitative and intended to identify the effect of specific, predetermined factors that may have influenced or affected the progress of current, previous, and graduated students towards the doctoral degree in higher education. This study obtained responses to questions from the questionnaire/survey instrument concerning factors that affected program completion or attrition. Students had the opportunity to elaborate on factors from their dissertation, advisement, and personal, financial, and employment experiences that affected their ability …
Date:
December 2000
Creator:
Malmberg, Eric D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Developmental Stages of Concern of Teachers Toward the Implementation of the Information Technology Curriculum in Kuwait
Change is best carried out by individual teachers, and, thus, identifying and resolving teachers concerns about an innovation is imperative in guiding the change process to a successful point of implementation. The purpose of this study was to identify concerns that teachers experienced when implementing the Information Technology curriculum in all intermediate schools in Kuwait and to examine the relationships among teachers reported stages of concern and other factors, such as gender and experience. The stages of concern, one dimension of the Concerns-Based Adoption Model (CBAM), was applied to reveal teachers concerns. The Stages of Concern Questionnaire (SoCQ) and a demographic survey were completed by 248 respondents. The SoCQ measures seven stages of concern that reflect three dimensions: self (awareness, informational, and personal); task (management); and impact (consequence, collaboration, and refocusing Group profile analysis revealed that teachers had four high concerns related to collaboration, personal, refocusing, and informational stages. Teachers also reported low concerns at the management and awareness stages. Both females and males reported collaboration as their greater concern. Teachers with more years of experience reported higher impact concerns. The analysis of individuals peak concerns revealed that the majority of the respondents were adopters of the innovation. The analysis …
Date:
August 2000
Creator:
Alshammari, Bandar S.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Work in the calling in Max Weber's Protestant ethic thesis
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Use of this item is restricted to the UNT Community
Objectives. Scholars have debated Max Weber's theory of the relationship between religion and capitalism for almost 100 years. Still, the debate is clouded by confusion over Weber's claims about religious doctrine and over the supporting evidence. The purpose of this study is to clarify Max Weber's claims regarding the concept of the calling and the related "anti-mammon" injunction and concept of "good works" and substantiate with historical evidence the religious doctrine Weber describes. Methods. Comparative analysis of early Protestant Lutheran and Calvinist documents from the sixteenth and seventeenth centuries was used to flesh out a history of ideas to determine whether evidence exists to support Weber's claims related to religious doctrine. Results. Historical analyses revealed that the concept of the calling pre-dated Luther in the Bible. Luther's innovation was not in his use of the word beruf but in his application of the concept of the calling to the common people and his teaching of that idea. The idea of sanctified work was key in both Lutheran and Calvinist documents. There was an increased emphasis on work and encouragement to accumulate wealth in Calvinist documents. Conclusion. Weber's etymological evidence surrounding Martin Luther's use of the word beruf in his German …
Date:
December 2000
Creator:
Schindley, Wanda Beatrice Higbee
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Diphosphine Ligand Activation Studies with Organotransition-Metal Compounds
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Use of this item is restricted to the UNT Community
Thermolysis of CoRu(CO)7(m -PPh2) (1) in refluxing 1,2-dichloroethane in the presence of the diphosphine ligands 2,3-bis(diphenylphosphino)maleic anhydride (bma) and 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) furnishes the new mixed-metal complexes CoRu(CO)4(μ -P-P)(μ -PPh2) [where P-P = bma (3); bpcd (6)], along with trace amounts of the known complex CoRu(CO)6(PPh3)(μ -PPh2) (4). The requisite pentacarbonyl intermediates CoRu(CO)5(μ -P-P)(μ -PPh2) [where P-P = bma (2); bpcd (5)] have been prepared by separate routes and studied for their conversion to CoRu(CO)4(μ -P-P)(μ -PPh2). The complexes 2/3 and 5/6 have been isolated and fully characterized in solution by IR and NMR spectroscopy. The kinetics for the conversion of 2→3 and of 5→6 were measured by IR spectroscopy in chlorobenzene solvent. On the basis of the first-order rate constants, CO inhibition, and the activation parameters, a mechanism involving dissociative CO loss as the rate-limiting step is proposed. The solid-state structure of CoRu(CO)4(μ -bma)(μ -PPh2) (3) reveals that the two PPh2 groups are bound to the ruthenium center while the maleic anhydride π bond is coordinated to the cobalt atom. Thermolysis of the cluster Ru3(CO)12 with the bis(phosphine)hydrazine ligand (MeO)2PN(Me)N(Me)P(OMe)2 (dmpdmh) in toluene at 75°C furnishes the known clusters Ru4(CO)12[μ -N(Me)N(Me)] (9) and Ru3(CO)11[P(OMe)3] (10), in addition to the new …
Date:
December 2000
Creator:
Wang, Jiancheng
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Effects of Reinforcement History on Stimulus Control Relations
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Use of this item is restricted to the UNT Community
Ray (1969) conducted an experiment on multiple stimulus-response relations and selective attention. Ray's (1969) results suggested that stimulus-response relations function as behavioral units. McIlvane and Dube (1996) indicated that if stimulus-response relations are behavioral units the effects of environmental variables on stimulus-response relations should be similar to the effects of environmental variables on single response topographies. This experiment analyzed the effects of reinforcement history on the probability of stimulus-response relations with differing reinforcement histories. In separate conditions random-ratio schedules of reinforcement were contingent on each of four discriminated responses. To assess the effects of reinforcement, during test conditions stimuli controlling different topographies were present concurrently in composite form. Results show that reinforcement history affects the probability of each response topography and that the association between response topographies and their controlling stimuli tends to remain constant throughout variations in reinforcement probability.
Date:
December 2000
Creator:
Reyes, Fredy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Economic Development, Social Dislocation and Political Turmoil in Sub-Saharan Africa: A Pooled Time-Series Analysis and a Test of Causality
This study focuses on economic development and political turmoil in post-independence Sub-Saharan Africa. There has been a resurgence of interest in the region following the end of the Cold War. In 1997 U.S. president Bill Clinton took a 12-day tour of the region. In 1999 the U.S. Congress (106th Congress) passed the Growth and Opportunity Act and the Hope for Africa Act, designed to encourage political stability and economic development in the region. Although most Sub-Saharan African countries attained independence from colonial rule in the 1960s, more than 30 years of self-government have brought little economic development and political stability to the region. This study attempts to analyze, theoretically and empirically, the relationship among economic development, social dislocation and political turmoil. Social dislocation, as defined in this study, means "urbanization," and it is used as an exogenous variable to model and test the hypothesized causal relationship between economic development and political turmoil. This study employs pooled cross-sectional time-series and seemingly unrelated regression analyses, as well as Granger-causality, to examine the hypothesized relationships and causality in 24 Sub-Saharan African countries from 1971 to 1995. The results confirm the classical economic development theory's argument that an increase in economic development leads to …
Date:
December 2000
Creator:
Obi, Zion Ikechukwu
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Effect of Engineered Surfaces on Valve Performance
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Use of this item is restricted to the UNT Community
Performance of air operated valves is a major maintenance concern in process industries. Anecdotal information indicates that reliability of some high maintenance valves has been improved by using an ion deposition process to achieve engineered surfaces on selected components. This project compared friction for various surface treatments of selected valve components. Results indicate valve performance may be slightly more consistent when an engineered surface is applied in the valve packing area; however surface treatment in this area does not appear to have a dominant affect on reducing valve friction. Results indicate a linear relation between stem friction and torque applied to packing flange nuts, and even after a valve is in service, controlled packing adjustments can be made without significantly changing valve stroke time.
Date:
December 2000
Creator:
Pope, Larry G.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library