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UNT Theses and Dissertations
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College of Music Recordings
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UNT Oral Histories
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363 Matching Results
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Comparison and Evaluation of Existing Analog Circuit Simulator using Sigma-Delta Modulator
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In the world of VLSI (very large scale integration) technology, there are many different types of circuit simulators that are used to design and predict the circuit behavior before actual fabrication of the circuit. In this thesis, I compared and evaluated existing circuit simulators by considering standard benchmark circuits. The circuit simulators which I evaluated and explored are Ngspice, Tclspice, Winspice (open source) and Spectre® (commercial). I also tested standard benchmarks using these circuit simulators and compared their outputs. The simulators are evaluated using design metrics in order to quantify their performance and identify efficient circuit simulators. In addition, I designed a sigma-delta modulator and its individual components using the analog behavioral language Verilog-A. Initially, I performed simulations of individual components of the sigma-delta modulator and later of the whole system. Finally, CMOS (complementary metal-oxide semiconductor) transistor-level circuits were designed for the differential amplifier, operational amplifier and comparator of the modulator.
Date:
December 2006
Creator:
Ale, Anil Kumar
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Oral History Interview with Shuford M. Alexander, Jr., December 2, 1999
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Interview with engineer and Army Air Forces veteran Shuford M. Alexander, Jr. The interview includes Alexander's personal experiences about being a fighter pilot in Italy during World War II, basic training, flight training, various assignments and transfers, Operation STRANGLE, being shot down by flak over Piacenza, and being rescued by Italian partisans. Additionally, Alexander talks about his link-up with a British A-4 Mission and his attempt to reach Allied lines, his betrayal by a German agent and his subsequent capture, escaping and continuing his search for Allied lines, his observations and opinions about the partisans, a second encounter with a British A-4 Mission, the Martani family in the village of Tosca, his group's trek through mountain snow to reach Allied lines, meeting with British paratroopers and with African-American soldiers from the 92nd Infantry Division, and his reunion with his squadron in Pisa. The interview includes an appendix with a narrative by Alexander.
Date:
December 2, 1999
Creator:
Alexander, William J. & Alexander, Shuford M., Jr.
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with George Charland, December 7, 1998
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Transcript of an interview with George E. Charland, a Native American Marine Corps veteran, concerning his experiences during World War II. Charland discusses his experiences with the 3rd Marine Defense Battalion during the Japanese attack at Pearl Harbor on December 7, 1941; his experiences with the 2nd Marine Regiment, 1st Marine Division, at Guadalcanal, 1942; his experiences with E Company, 2nd Battalion, 2nd Marine Regiment, 2nd Marine Division, at Tarawa, 1943; his experiences with the 4th Marine Division at Saipan and Tinian, 1944, and Iwo Jima, 1945; medical discharge in April, 1945.
Date:
December 7, 1998
Creator:
Alexander, William J. & Charland, George E.
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with Elijah Collins, Jr., December 6, 2001
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Interview with Navy veteran Elijah Collins Jr. The interview includes Collins' personal experiences while aboard the destroyer USS Blue during the Japanese attack at Pearl Harbor on December 7, 1941. Collins also talks about the Battle of Savo Island and the sinking of the Blue.
Date:
December 6, 2001
Creator:
Alexander, William J. & Collins, Elijah, Jr.
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with Herb Elfering, December 6, 2001
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Interview with electrical engineer and Army veteran Herb Elfering, The interview includes Elfering's personal experiences with a searchlight/radar battery, 251st Coast Artillery Regiment, at camp Malekole during the Japanese attack at Pearl Harbor on December 7, 1941. Elfering also gives brief descriptions of his later experiences at Bougainville and Luzon.
Date:
December 6, 2001
Creator:
Alexander, William J. & Elfering, Herb
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with William J. Fisk, December 26, 1996
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Interview with William J. Fisk, a Navy veteran (VPB-123), concerning his experiences in the Pacific Theater during World War II. Assignment to the crew of a PB4Y-2; his unauthorized participation in a combat mission out of Okinawa over the Sea of Japan; battle damage to his plane; description of Hiroshima and Nagasaki from aerial observations after the dropping of the atomic bombs.
Date:
December 26, 1996
Creator:
Alexander, William J. & Fisk, William J.
Object Type:
Text
System:
The UNT Digital Library
Oral History Interview with Alan A. Fouts, December 6, 2001
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Interview with Navy veteran Alan A. Fouts. The interview includes Fouts' personal experiences while assigned to the Submarine Base during the Japanese attack at Pearl Harbor on December 7, 1941, and his subsequent service aboard the submarine USS Pogy in the Pacific Theater during World War II.
Date:
December 6, 2001
Creator:
Alexander, William J. & Fouts, Alan A., 1920-
Object Type:
Book
System:
The UNT Digital Library
Development, Validation, and Evaluation of a Continuous, Real-time, Bivalve Biomonitoring System
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A biological monitoring tool to assess water quality using bivalve gape behavior was developed and demonstrated. The purpose of this work was to develop methodologies for screening water quality appropriate to the goals of the watershed paradigm. A model of bivalve gape behavior based on prediction of behavior using autoregressive techniques was the foundation of the bivalve biomonitoring system. Current technology was used in developing the system to provide bivalve gape state data in a continuous real-time manner. A laboratory version of the system, including data collection and analysis hardware and software, was developed for use as a toxicological assay for determination of effective concentrations of toxicant(s) or other types of stress on bivalve gape behavior. Corbicula fluminea was monitored and challenged with copper, zinc, and chlorpyrifos using the system. Effective concentrations of 176±23µg/L copper, 768±412µg/L zinc, and 68µg/L chlorpyrifos were observed using a natural water with high dissolved organic carbon concentrations. A rugged field version of the bivalve biomonitoring system was developed and deployed in two locations. The field systems were fitted with a photovoltaic array, a single board computer, and a CDPD telemetry modem for robust remote operation. Data were telemetered at a time relevant rate of once …
Date:
December 2002
Creator:
Allen, H. Joel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
"Driving Lessons" and Other Stories
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A study through short stories of the emotional effects on close family relationships before and after a traumatic death.
Date:
December 2019
Creator:
Allen, Laura Spencer
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effects of a Computer-mediated Intervention on "At-risk" Preschool Students' Receptive Vocabulary and Computer Literacy Skills.
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This study examined the effects of a computer-mediated intervention on "at-risk" preschool students' receptive vocabulary development, computer-literacy skills, and enthusiasm for leaning. Twenty-two preschool-aged children attending an urban primary public school and participating in government subsidized school lunch program participated in the study. A pretest/posttest control-group design and case-study participant observations were used for data collection. Students were assigned to one of two treatment groups. Eleven preschool students with pretest School Readiness Composite (SRC) standard scores of 80, or below, on the Bracken Basic Concept Scale-Revised (BBCS-R), were assigned to the intervention group. Eleven pre-school students matched by age level and teacher comprised the comparison group. The intervention group received computer-mediated instruction while the comparison group received classroom teacher instruction. The first research question examined the effect of the intervention on students' receptive vocabulary analyzing groups' pretest and posttest BBCS-R School Readiness Composite mean scores. Combined analysis of a Two-Factor Repeated Measures and a Posttest only ANCOVA revealed that computer-mediated instruction was as effective as classroom teacher instruction in helping "at-risk" students acquire readiness receptive vocabulary. The second research question examined the effect of the intervention on "at-risk" student's computer-literacy skills analyzing participants pretest and posttest mean scores on the …
Date:
December 2003
Creator:
Alman, Lourdes Fraga
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Ensemble: 2005-12-01 – African Percussion Ensemble
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Concert performed at the UNT College of Music Concert Hall.
Date:
December 1, 2005
Creator:
Alorwoyie, Gideon Foli
Object Type:
Sound
System:
The UNT Digital Library
Integrating life cycle analysis and the ecological footprint calculator to foster sustainable behaviors
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Many tools have been developed to assess global, national or regional sustainable development policies. However, as governments develop sustainable policies, individuals must also feel empowered to affect their personal impact on the planet. This thesis integrates three sustainability concepts that lend themselves to individual sustainability: The natural step, life cycle assessment, and the ecological footprint. TNS serves to provide the meaning and substance toward sustainable development. LCA helps provide the framework for assessing sustainability. The EF calculator determines the driving components and measures the qualitative decisions made through TNS and LCA. From the analysis of the household footprint calculator a simplified footprint calculator was developed to assist individuals and communities in setting benchmarks and goals as they move away from over-consumption and towards a sustainable lifestyle.
Date:
December 2002
Creator:
Anderle, Kathryn
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Development of a Coaxiality Indicator
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The geometric dimensioning and tolerancing concept of coaxiality is often required by design engineers for balance of rotating parts and precision mating parts. In current practice, it is difficult for manufacturers to measure coaxiality quickly and inexpensively. This study examines feasibility of a manually-operated, mechanical device combined with formulae to indicate coaxiality of a test specimen. The author designs, fabricates, and tests the system for measuring coaxiality of holes machined in a steel test piece. Gage Repeatability and Reproducibility (gage R&R) and univariate analysis of variance is performed in accordance with Measurement System Analysis published by AIAG. Results indicate significant design flaws exist in the current configuration of the device; observed values vary greatly with operator technique. Suggestions for device improvements conclude the research.
Date:
December 1999
Creator:
Arendsee, Wayne C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Current Practices in Working With Special Education Paraeducators.
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With so many paraeducators working in special education, it is important for teachers, administrators, and researchers to know how paraeducators are being utilized, supervised, and managed in order to create the most effective programs for students with special needs. Research is needed regarding current practices in supervising paraeducators. The purposes of this study were to (a) delineate the current practices being utilized by special education teachers of students with emotional and behavioral disorders (EBD) who supervise paraeducators that work with students with EBD in the general education classroom and (b) determine how effective the supervised paraeducators perceive those practices to be. Current practices were revealed by answering the following questions: (1) According to special education teachers and paraeducators, what procedures and practices are being utilized to supervise paraeducators who work in the general education environment with students with EBD? (2) In what ways do teachers and paraeducators see these supervision practices as being effective? (3) What is the relationship between actual supervision practices and accepted best practices? There were 60 participants in all, 30 professional teachers and 30 paraeducators. All 60 participants completed a survey; of these 60, 5 teachers and 5 paraeducators were individually interviewed Findings from the study …
Date:
December 2006
Creator:
Asel, Crystal S.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Design Method of Cold-Formed Steel Framed Shear Wall Sheathed by Structural Concrete Panel
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The objective of this research is developing a new method of design for cold-formed steel framed shear wall sheathed by ¾" thick USG structural panel concrete subfloor using a predictive analytical model and comparing the results obtained from the model with those achieved from real testing to verify the analytical model and predicted lateral load-carrying capacity resulted from that. Moreover, investigating the impact of various screw spacings on shear wall design parameter such as ultimate strength, yield strength, elastic stiffness, ductility ratio and amount of energy dissipation is another purpose of this research.
Date:
December 2019
Creator:
Ashkanalam, Aida
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Apologist Tradition: A Transitional Period in Southern Proslavery Thought, 1831-1845
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Early antebellum defenders of slavery acknowledged that slavery created problems for southern society. They contended, however, that slave society was better and more natural than other forms of social organization. Thomas R. Dew, William Harper, and James Henry Hammond each expressed a social philosophy in which slavery had a crucial role in preserving social order. They argued from the basis of social organicism, the idea that society should have an elite that controlled the masses. For all three men, slavery represented a system of order that helped balance the dangers of democracy. Significantly, however, all three men recognized that the slave system was not perfect, and despite their defense of slavery, argued that it was a human institution and therefore corruptible.
Date:
December 2000
Creator:
Austin, Clara
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Pyrimidine Enzyme Specific Activity at Four Different Phases of Growth in Minimal and Rich Media, and Concomitant Virulence Factors Evaluation in Pseudomonas aeruginosa
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Pseudomonas aeruginosa is a Gram-negative rod, aerobic, non-fermenting, oxidase positive, pigment producing, and nutritionally versatile bacterium. Infections by P. aeruginosa are the most important cause of morbidity and mortality in immunocompromised patients, given virulence factor production that suppresses antibiotic therapy and promotes persistent infection. This research is the first comprehensive report of the pyrimidine biosynthetic pathway for all phases of growth in minimal and rich media coupled with the evaluation of virulence factor production of P. aeruginosa in comparison to four other bacterial species (Pseudomonas putida, Pseudomonas fluorescens, Burkholderia cepacia, and Escherichia coli wild-type strains). Cellular growth and passing genetic information to the next generation depend on the synthesis of purines and pyrimidines, the precursors of DNA and RNA. The pyrimidine biosynthetic pathway is essential and found in most organisms, with the exception of a few parasites that depend upon the pyrimidine salvage pathway for growth. Both the pyrimidine biosynthetic and salvage enzymes are targets for chemotherapeutic agents. In our laboratory, research on pyrimidine auxotrophic mutants showed the role of the pyrimidine biosynthetic pathway and its intermediates on P. aeruginosa metabolism and impaired virulence factors production. The present research shows that pyrimidine enzymes are active in all phases of growth, …
Date:
December 2005
Creator:
Azad, Kamran Nikkhah
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Characterization, Analysis, and Optimization of Rotary Displacer Stirling Engines
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This work focuses on an innovative Rotary Displacer SE (RDSE) configuration for Stirling engines (SEs). RDSE features rotary displacers instead of reciprocating displacers (found in conventional SE configurations), as well as combined compression and expansion spaces. Guided by the research question "can RDSE as a novel configuration achieve a higher efficiency compared to conventional SE configurations at comparable operating conditions?", the goal of this study is to characterize, analyze, and optimize RDSE which is pursued in three technical stages. It is observed the RDSE prototype has an optimum phase angle of > 90° and thermal efficiency of 15.5% corresponding to 75.2% of the ideal (Carnot) efficiency at the source and sink temperatures of 98.6° C and 22.1° C, respectively. Initial results indicate that 125° phase angle provides more power than that of the theoretically optimum 90° phase angle. The results also show comparable B_n and significantly higher W_n values (0.047 and 0.465, respectively) compared to earlier studies, and suggest the RDSE could potentially be a competitive alternative to other SE configurations. Furthermore, due to lack of a regenerator, the non-ideal effects calculated in the analytical approach have insignificant impact (less than 0.03 kPa in 100 kPa). The clearance volume in …
Date:
December 2019
Creator:
Bagheri, Amirhossein
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Descriptive Study of Students Who Were Accepted for Admission at West Texas A&M University But Did Not Enroll
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Each year, institutions of higher education devote valuable financial and personnel resources in the hope of enhancing student recruitment and matriculation. The purpose of this study was to examine the demographic characteristics, the factors that influenced students decisions to apply for admission to a university, their educational intentions, and their reasons for not enrolling after they had been admitted. The subjects of the study were first-time freshmen accepted for admission to a mid-size, public, southwestern university who did not enroll for the fall 1997 semester. Statistically significant differences were found when comparing no-shows and enrolled students by gender, ethnicity, age, ACT/SAT score, and distance of their hometown from the university. There were more female no-shows, and more males enrolled than females; a greater percentage of no-shows reported the distance of their hometown to be more than 200 miles; and the mean test score for no-shows was higher. Factors important in the college selection process found to be statistically significant among the groups were: a greater percentage of Minorities than Caucasians reported the importance of the financial aid award or a scholarship offer; students living within 100 miles of the campus reported the proximity of the university as important, advice received …
Date:
December 1999
Creator:
Barton, Mary Edna
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
James Earl Rudder: A Lesson in Leadership
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This thesis is the about the life of Rudder. The emphasis of this work, however, is that Rudder was successful primarily because of his character and leadership style. Much of the study was drawn from primary sources. Secondary sources were also consulted. This thesis opens with a brief Introduction, which discusses the need for this work. Chapter 1 discusses Rudder's life prior to WW II, emphasizing particular characteristics that benefited his leadership ability. Chapter 2 examines the 2nd Ranger Battalion's transformation under Rudder's leadership and guidance. Chapter 3 chronicles the 2nd Ranger Battalion's assault on the Pointe du Hoc battery, ending in December 1944, when Col. Rudder was reassigned to the 109th Infantry Regiment. Moreover, the controversy surrounding the Ranger's mission is also examined in this chapter. Chapter 4 describes Col. Rudder's leadership with the 109th in the Battle of the Bulge. A chapter accounting Rudder's political career and leadership follows. Chapter 6 examines his term as chancellor and president of the Texas A&M University system, until his death in 1970, and the major institutional changes that he enacted during his tenure, which resulted in A&M becoming the respected research university it is today. This significance and recapitulation of Rudder's …
Date:
December 2003
Creator:
Bean, Christopher B.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Master's Recital: 2009-12-03 - Conrad Bear, baritone
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Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Master of Music (MM) degree.
Date:
December 3, 2009
Creator:
Bear, Conrad
Object Type:
Sound
System:
The UNT Digital Library
Treatment efficacy in a chronic pain population: Pre- to post-treatment.
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The purpose of the current study was to investigate the effects of a multidisciplinary pain management program on five measures of subjective psychosocial factors. Ninety-five participants in the comprehensive multidisciplinary treatment group and the standard medical intervention control group were surveyed about various psychosocial factors using Axis II of the West Haven - Yale Multidimensional Pain Inventory (MPI), pre- to post-treatment. It was hypothesized that post-treatment levels would be significantly lower than pre-treatment levels for all five psychosocial variables. Additionally, gender and ethnicity variables were examined. Based on preliminary analyses indicating pre-treatment differences between the experimental and control group, five 2 x 2 x 3 analyses of covariances (ANCOVAs) were used to examine the above hypotheses. Results indicated significant differences between the treatment conditions on measures of control, with the comprehensive group feeling more in control than the standard group at post-treatment. No other significant main effects for treatment condition were found on the measures of pain severity, interference with daily activities, negative mood, or social support. However, a significant gender main effect was found for social support at post-treatment, with females reporting more social support than males. A significant gender x ethnicity interaction was also found for post-treatment control, …
Date:
December 2004
Creator:
Bernstein, Dana N.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Job Embeddedness as a Predictor of Voluntary Turnover: Validation of a New Instrument
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Voluntary turnover has become a problem for many organizations in today's society. The cost of this turnover reaches beyond organizational impact, but also affects the employees themselves. For this reason, there has been a plethora of research conducted by both academicians and practitioners on the causes and consequences of voluntary turnover. The purpose of this study is to test the validity and generalizability of the job embeddedness model of voluntary turnover to the information technology (IT) industry. The IT field has been plagued with high turnover rates in recent years. In this study, the job embeddedness model (Mitchell et al., 2001) is applied to a population sample consisting of health care information technology employees.
Date:
December 2003
Creator:
Besich, John S.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Performance appraisal impact on employee career development and performance: A longitudinal study.
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The purpose of this study was to determine the effectiveness of the implementation of an internally created performance appraisal system as well as the subjects' overall satisfaction with the implementation. The system was implemented at a major technology consulting firm in the US. The subjects of this study were three levels of employees of the firm. An employee survey conducted annually at the firm included questions relating to the implementation of the performance appraisal system. Eight years of employees' responses to three key questions were analyzed. Employees' perceptions of the appraisal feedback aiding increased performance, their belief about the implementation assisting with their career management, satisfaction with the initiative, and their understanding of the requirements for promotion were captured by this survey. Trend analysis indicates that employees at the firm perceived their career path knowledge unimproved, their understanding of promotion criteria unimproved as a result of the implementation. Employees did not indicate overall satisfaction with the implementation and the employee's belief about their skills and abilities utilization did not improve post implementation.
Date:
December 2006
Creator:
Bhagwat, Tanya A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library