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Measurement of the top quark mass
This dissertation describes the measurement of the top quark mass m{sub t} using events recorded during a 125 pb{sup -1} exposure of the D0 detector to {radical}s=1.8 TeV {anti p}p collisions. Six events consistent with the hypothesis t{anti t} {yields} bW{sup +}, {anti b}W{sup -} {yields} b{anti l}{nu}, {anti b}l{anti {nu}} form the dilepton sample. The kinematics of such events may be reconstructed for any assumed mt, and the likelihood of each such solution evaluated. A measurement of m{sub t} based on these relative solution likelihoods gives m{sub t} = 169.9 {+-} 14.8 (stat.) {+-} 3. 8 (syst.) GeV/c{sup 2}. A 2C kinematic fit is performed on a sample of 77 events consistent with t{anti t} {yields} bW{sup +}, {anti b}W{sup -} {yields} b{anti l}{nu}, {anti b}q{anti q} , and this, in combination with an estimate on the likelihood that each event is top, yields m{sub t} = 173.3 {+-} 5.6 (stat.) {+-} 6.2 (syst.) GeV/c{sup 2} . A combination of these two measurements gives m{sub t} = 173.1 {+-} 5.2 (stat.) {+-} 5.7 (syst.) GeV/c{sup 2}.
Date:
December 31, 1997
Creator:
Varnes, E.W.
System:
The UNT Digital Library
Measurement of the W and Z boson production cross sections in p {anti p} collisions at {radical}s = 1.8 TeV with the D-Zero detector
This thesis reports on the measurement of the W and Z boson inclusive production cross sections ({sigma}{sub W} and {sigma}{sub Z}) times electronic branching ratios (Br(W {yields} e{nu}) and Br(Z {yields} ee)) in p{anti p} collisions at {radical}s = 1.8 TeV. The analysis is based on 12.8 pb{sup -1} of data taken in the 1992-1993 run by the D0 detector at the Fermilab Tevatron collider; the cross sections were measured to be: {sigma}{sub W} {center_dot} Br(W {yields} e{nu}) = 2. 36 {+-} 0.02 {+-} 0.07 {+-} 0.13 nb and {sigma}{sub Z} {center_dot} Br(Z {yields} ee) = 0.218 {+-} 0.008 {+-} 0.008 {+-} 0.012 nb. The first error is statistical, the second error represents the non- luminosity systematic error, and the third error shows the uncertainty in the luminosity determination. Future prospects for similar measurements based on larger samples of data are discussed.
Date:
December 31, 1997
Creator:
Grudberg, P.M.
System:
The UNT Digital Library
Microdosimetric investigations at the Fast Neutron Therapy Facility at Fermilab
Microdosimetry was used to investigate three issues at the neutron therapy facility (NTF) at Fermilab. Firstly, the conversion factor from absorbed dose in A-150 tissue equivalent plastic to absorbed dose in ICRU tissue was determined. For this, the effective neutron kerma factor ratios, i.e. oxygen tissue equivalent plastic and carbon to A-150 tissue equivalent plastic, were measured in the neutron beam. An A-150 tissue equivalent plastic to ICRU tissue absorbed dose conversion factor of 0.92 {+-} 0.04 determined. Secondly, variations in the radiobiological effectiveness (RBE) in the beam were mapped by determining variations in two related quantities, e{sup *} and R, with field size and depth in tissue. Maximal variation in e{sup *} and R of 9% and 15% respectively were determined. Lastly, the feasibility of utilizing the boron neutron capture reaction on boron-10 to selectively enhance the tumor dose in the NTF beam was investigated. In the unmodified beam, a negligible enhancement for a 50 ppm boron loading was measured. To boost the boron dose enhancement to 3% it was necessary to change the primary proton energy from 66 MeV and to filter the beam by 90 mm of tungsten.
Date:
December 31, 1997
Creator:
Langen, K.M.
System:
The UNT Digital Library
Promising freeze protection alternatives in solar domestic hot water systems
Since the gains associated with solar thermal energy technologies are comparatively small in relation to the required capital investment, it is vital to maximize conversion efficiency. While providing the necessary function of freeze protection, the heat exchanger commonly included in solar domestic water heating systems represents a system inefficiency. This thesis explores two alternate methods of providing freeze protection without resorting to a heat exchanger. Commonly, collectors are made of rigid copper tubes separated by copper or aluminum fins. Cracking damage can occur when water is allowed to freeze and expand inside the non compliant tubes. The possibility of making collectors out of an elastic material was investigated and shown to be effective. Since unlike copper, elastomers typically have low thermal conductivities, the standard collector performance prediction equations do not apply. Modified thermal performance prediction equations were developed which can be used for both low and high thermal conductivity materials to provide accurate predictions within a limited range of plate geometries. An elastomeric collector plate was then designed and shown to have comparable performance to a copper plate collector whose aperture area is approximately 33% smaller. Another options for providing freeze protection to an SDHW system is to turn it …
Date:
December 31, 1997
Creator:
Bradley, David E.
System:
The UNT Digital Library
Admissions Committee Ratings as Predictors of Persistence in Master's-level Theological Education
This research attempted to ascertain whether the ratings of applicants in the admissions-evaluation process of Dallas Theological Seminary (Admission Committee Rating, or ACR) were related to persistence in seminary study sufficiently to allow reasonable prediction of completion based on the strength of the ratings. Five ACRs were examined - the total ACR and its four components, strength of previous academics, personal references, potential and promise for ministry, and previous ministry experience. Other non-admissions factors were also examined to see what relationship they had to persistence. Those factors were years of matriculation, age at matriculation, gender, marital status, ethnicity, nationality, types of previous higher education, whether or not financial aid was received (if known), and the total amount of financial aid received (if known). Persistence in the study was defined as graduation from the seminary's major four-year master's degree program (Th.M.) within the time limits published for the degree. Analysis results indicated that only two of the five ACRs were statistically significant, ministry potential and ministry experience, but the relationship with completion was weak. The conclusion reached was that the relationship between the strength of the admission evaluation and persistence was practically insignificant and contributed little to the ability to predict …
Date:
December 1997
Creator:
Thames, James H.
System:
The UNT Digital Library
Aluminum and Copper Chemical Vapor Deposition on Fluoropolymer Dielectrics and Subsequent Interfacial Interactions
This study is an investigation of the chemical vapor deposition (CVD) of aluminum and copper on fluoropolymer surfaces and the subsequent interfacial interactions.
Date:
December 1997
Creator:
Sutcliffe, Ronald David
System:
The UNT Digital Library
Andrejs Jurjāns as Symbol of Latvian Identity: Native Folk Songs in his Large-Scale Symphonic Works
This thesis presents a study of Andrejs Jurjāns' significant symphonic works as informed by a native musicologist, Professor Jānis Torgāns, and illuminates Jurjāns' role within the cosmopolitan framework of nationalism in music.
Date:
December 1997
Creator:
Švalbe, Erika Lynn
System:
The UNT Digital Library
Biology and Energetics of Tropisternus Lateralis Nimbatus (SAY) (Coleoptera: Hydrophilidae) in a Playa on the Southern High Plains of Texas and Aquatic Coleoptera Diversity from Seven Playas on the Southern High Plains of Texas
A study of the biology of Tropisternus lateralis, a hydrophilid beetle, was conducted during the flood period of a single playa on the Southern High Plains of Texas from early June 1995 through early September 1995. Mechanism of colonization, tolerance/avoidance to drought, larval density, and secondary production were analyzed. T. lateralis colonized playas from surrounding aquatic habitats and avoided drought through aerial dispersion. Once in the playa, larval density increased over time. Secondary production was 1.31 g/m2/.25 yr. In addition, aquatic Coleoptera diversity was studied in seven playas on the Southern High Plains of Texas. A total of twenty three species were identified from the study region. Nine species not reported in playa literature were identified.
Date:
December 1997
Creator:
Cook, Robert E. (Robert Edward), 1969-
System:
The UNT Digital Library
Bohuslav Martinu: An Examination of Selected Chamber Music Involving the Clarinet
The discussion dealt with stylistic influences, compositional techniques, and performance considerations of chamber music involving clarinet composed by Bohuslav Martinu and included a performance of three of his works: Quartet. for clarinet, horn, cello, and side drum, Madrigals for oboe, clarinet, and bassoon, and Sextet for flute, oboe, clarinet, two bassoons, and piano. The selections performed and discussed in the lecture show compositional growth of the composer through the three periods of his life in which he composed chamber music which included winds. These three time periods are 1923-40 during his residency in Paris, 1941-56 during his residency in the United States, and 1957 until his death in 1959 when he returned permanently to Europe.
Date:
December 1997
Creator:
Walzel, Robert L.
System:
The UNT Digital Library
Cluster Analysis of the MMPI-2 in a Chronic Low-Back Pain Population
The Minnesota Multiphasic Personality Inventory (MMPI) is the most frequently used psychological measure in the assessment of chronic pain. Since the introduction of the MMPI-2 in 1989 only two published studies have focused on cluster analysis of chronic pain patients. This study investigated MMPI-2 cluster solutions of chronic low-back pain patients. Data was collected from 2,051 chronic low-back pain patients from a multidisciplinary pain clinic in the southwestern United States. A hierarchical clustering procedure was performed on K-corrected T-scores of the MMPI-2 using the three validity and ten clinical scales. Four relatively homogeneous subgroups were identified for each sex with the MMPI-2. In general, these results replicated the findings of previous researchers using both the MMPI and MMPI-2.
Date:
December 1997
Creator:
DeBeus, Roger J. (Roger John)
System:
The UNT Digital Library
College Students' Attitudes toward Pregnancy and Women in the Work Force
The purpose of this study was to assess college students' attitudes toward pregnancy and women in the work force following the passage of the Family Medical Leave Act of 1993. Data were obtained from 347 students at a university in North Texas during the spring semester of 1997. Gender, age, employment status, parental status, and citizenship were independent variables hypothesized to influence attitudes toward pregnant working women. Gender was significant for the following factors: pregnant women as employees (p<.001), emotional stereotypes (p<.001), choosing family or career (p<.001), and physical limitations (p<.001). Those students 17-19-years-old had a more negative attitude toward pregnant women choosing work over family (p<.001) than did the older students.
Date:
December 1997
Creator:
Coolidge, Amy (Amy Lewis)
System:
The UNT Digital Library
A Comparative Analysis of Curricular Programs in Private, Public Choice, and Public Attendance-Zone Schools in San Antonio, Texas
The purpose of this study was to examine curricular programs in private, public choice, and public attendance-zone schools to determine whether differences exist among curricular programs in the three types of schools. The findings from the student survey data indicated that private school students reported their curriculum to be more challenging than public school students, but no other significant differences were noted. Findings from the teacher survey showed more positive results for private schools in indicators of a challenging curriculum, expectations of students, school climate, and external support than public schools. This study showed that of the types of schools examined, Catholic schools exhibited the most consistent and well written curriculum that reflected the four research questions. Future research needs to be done to establish whether these indicators of a challenging curriculum result in higher student achievement.
Date:
December 1997
Creator:
Miller, Alice Elizabeth Owen
System:
The UNT Digital Library
Comparing Quality of Life: American and Portuguese Cancer Patients with Hematological Malignancies
The purpose of this study is to investigate the differences and similarities of quality of life (QoL) in American and Portuguese cancer patients with hematological malignancies as well as the robustness of the measures cross-culturally. Portuguese participants were 98 patients and 49 accompanying persons and the American participants were 55 patients and 22 accompanying persons. Fifty (Portuguese sample) to 40% (American sample) of the patients came with an accompanying person who answered the questionnaire concerning the patient's QoL. The two cultural groups were characterized in terms of QoL (measured by the SF-36 and the FLIC), social support (Social Support Scale), socio-demographic and clinical variables. Portuguese patients reported a higher QoL. However, this result could be attributable to the fact that the two cultural samples differ in socio-economic status. The measures seem to be comparable for the Portuguese and American samples, at least in what concerns reliability and concurrent validity.
Date:
December 1997
Creator:
Forjaz, Maria João
System:
The UNT Digital Library
Comparing the Personal Lives of Psychotherapists and Research Psychologists
Although the personal life of the therapist has been a topic of interest for nearly sixty years there is still a paucity of research in this area. There is also a lack of research into the personal lives of researcher psychologists. In this study 282 psychologists (151 researchers and 131 therapists) who attended regional meetings and seminars sponsored by professional psychological associations in Texas were sampled. Job stressors, personal problems and health concerns, relaxation techniques, life satisfaction, and work impact on personal life were some of the areas examined. The most important stressors associated with research were excessive teaching responsibilities, pressures associated with funding and lack of time for a personal life. For therapists the most important stressors associated with work were suicide attempts by clients, clients showing resistance, and clients being angry. Therapists reported more concerns related to anxiety, depression, and family problems than researchers. Both groups chose exercise/sports and movies/television as their most common methods for relaxation. Therapists were three times more likely to have been in therapy than researchers and once in therapy reported six times the number of hours. Researchers reported less childhood abuse than therapists. However, therapists were more satisfied with their current life, indicating …
Date:
December 1997
Creator:
Radeke, JoAnn Taylor
System:
The UNT Digital Library
Compulsive Sexual Behavior and Personality Characteristics : A Comparative Analysis
The purpose of the present study was to compare the scores of the Beck Depression Inventory, State-Trait Anxiety Inventory, and the Coopersmith Inventory of heterosexual men with compulsive sexual behavior (N = 22), homosexual men with compulsive sexual behavior (N = 19), heterosexual men without compulsive sexual behavior (N = 38), and homosexual men without compulsive sexual behavior (N = 8). The Sex Addiction Screening Test was used to determined placement in a group. Findings revealed men who exhibit compulsive sexual behavior are significantly more depressed, experience lower self-esteem and have higher state anxiety (situational) than controls.
Date:
December 1997
Creator:
Austin, Christopher Joe
System:
The UNT Digital Library
Detection of Malingering on Raven's Standard Progressive Matrices and the Booklet Category Test
The capacity of Raven's Standard Progressive Matrices (SPM) and the Booklet Category Test (BCT) to discriminate between groups of brain-injured, simulated malingering, and normal participants was investigated in this study. Exploratory analyses were also conducted to examine the differences between groups categorized as sophisticated and naive fakers. Clinical decision rules and discriminant function analyses were utilized to identify malingerers. Clinical decision rules ranged in hit rates from 41% to 78%, in sensitivity from 2% to 100%, and in specificity from 86% to 100%. Discriminant functions ranged in hit rates from 81% to 86%, in sensitivity from 68% to 73% and in specificity from 82% to 87%. Overall, the least helpful detection method examined was below chance responding on either measure, while the most efficient was gross errors for SPM.
Date:
December 1997
Creator:
Isler, William C. (William Charles)
System:
The UNT Digital Library
Development in the design and performance of gas avalanche microdetectors (MSGC, MGC, and MDOT)
There has been continuing development of generic classes of microstrip gas chambers (MSGCs), microgap gas chambers (MGCs) and microdot gas chambers (MDOTs) at Lawrence Berkeley National Laboratory (LBNL) over the past few years, to improve such detectors beyond their present capabilities, to produce detectors suitable for use in current or upcoming experiments, and to allow a basis for new R&D developments which may incorporate these detectors as part of the system. All of these new detectors are collectively referred to as {open_quotes}gas avalanche microdetectors{close_quotes}. The MSGC, which was motivated by the pioneering work of A. Oed, has many attractive features, especially excellent spatial resolution ({approximately}30 {mu}m rms at normal incidence) and high rate capability ({approximately}10{sup 6} mm{sup -2}{center_dot}s{sup -1}). Moreover, the MGC seems to have certain advantages over the MSGC in speed, stability and simplicity, and the MDOT has larger gain (>10{sup 4}) and the intrinsic advantages of two-dimensional readout. Because of these attractive properties, they have received a great deal of attention for nuclear and high energy physics experiments, medical X-ray imaging and many other fields requiring radiation detection and measurement.
Date:
December 1, 1997
Creator:
Cho, Hyo-Sung
System:
The UNT Digital Library
Differences in Parenting Stress Between Parents of Children with ADHD, Children with Internalizing Behavior Problems, and Non-Referred Children
Recently, researchers have begun to explore the associated impacts of ADHD on parent and family functioning, with an increasing focus on parenting stress. Accumulating empirical evidence is mixed, suggesting that parents of children with ADHD report increased levels of parenting stress when compared to parents of children with learning disabilities, and parents of non-referred children, but report equally stressful parenting levels when compared to parents of children with externalizing behavior problems. Results of the present study comparing reported parenting stress levels between parents of children with ADHD, children with internalizing behavior problems, and nonreferred children, were partially supportive of results found in past studies indicating higher levels of parenting stress among parents of children with ADHD. However, strong gender effects were found between mothers and fathers, which mediated the overall results.
Date:
December 1997
Creator:
Conte, Deborah A. (Deborah Ann)
System:
The UNT Digital Library
Distribution of a Novel Gram Negative, Capsule-Forming Bacterium
A novel Gram negative, capsule-forming bacterium was previously isolated in Dr. G. Roland Vela's laboratory. The distribution of this bacterium in soils from various locations was investigated. Soil samples from 188 locations around the world were examined. Isolates of the bacterium were obtained from 50 of these soils, with 48 of the isolates found in soils from the southwestern United States and northern Mexico. This suggests that this region is the natural habitat of the bacterium. The other two isolates were obtained from Madrid, Spain and Taipei, Taiwan. None were found in soils from South America or Australia. A lack of variation in morphology and physiological properties in the isolates suggests that a homogeneous population exists, even from widespread geographical locations.
Date:
December 1997
Creator:
Hughes, Roxana Bejarano
System:
The UNT Digital Library
The Distribution of Environmental Contaminants: a Socio-Historical Study of Selected Neighborhoods in Dallas County, Texas
This research expands on recent sociological studies which maintain that environmental contaminants in America are disproportionately placed in neighborhoods inhabited by minorities and the poor. Prior studies have focused on the predictor variables which identify areas of contamination near residential neighborhoods, yet fail to explore the socio-political and historical factors which contribute to these phenomena. The Environmental Protection Agency's Toxic Release Inventory 1990 database, the Texas Natural Resource Conservation Commission's Annual Report of the Hazardous and Solid Waste Program for 1992, and the U.S. Census Bureau's 1990 Census Data for Dallas County were utilized in pinpointing industries violating toxic release standards. Socio-historical data was obtained from government and historical records and reports, books, and newspaper clippings on Dallas County. Maps and data were obtained from the North Central Texas Council of Governments, and the cities of Dallas and Garland. Chapter I discusses the synergetic forces of capitalism, urban growth, uneven development, and settlement patterns resulting in the distribution of environmental contaminants. Chapter II reviews the literature and presents evidence that race and class are strong predictors of where environmental contaminants are located. Chapter III outlines the data and methods employed. Chapter IV traces the historical development of Dallas County. Chapter …
Date:
December 1997
Creator:
Cutrer, Jennifer G.
System:
The UNT Digital Library
Disturbing the Peace
Disturbing the Peace is a short, 16mm sync-sound fiction film. Alone one stormy night, a woman must contend with an intruder breaking into her home. The intruder turns out to be a teenage boy. He claims to have broken in only to retrieve a family heirloom he hid there when he and his parents lived in the same house years ago. When the boy finds the heirloom, the woman begins to believe his story, and soon realizes he doesn't have a good home life. The boy asks permission to stay until the storm breaks. She agrees. Should the boy be trusted, or is he telling one lie after another? The police arrive to witness the outcome of the story.
Date:
December 1997
Creator:
Hatton, William, 1972-
System:
The UNT Digital Library
Earnings Management and the Independence or Interdependence of Accounting Choices: the Decision to Adopt Mandated Accounting Changes
This research examines whether firms managed earnings in the year they adopted SFAS 109, Accounting for Income Taxes (or its predecessor SFAS 96), by combining the choice to adopt SFAS 109 with other accounting choices in an interdependent rather than independent manner. Prior literature generally analyzes only one specific accounting choice, assuming that the decision is independent of other accounting procedure choices. However, it is unlikely that managers act in this manner. When attempting to achieve certain income goals, managers have numerous accounting tools available to them including the choice of accounting procedures and the exercise of judgment as to accrual amounts. This study investigates five choices consisting of: (1) the adoption of SFAS 109/96; (2) the adoption of SFAS 106; (3) the reporting of a restructuring of operations and/or a write-down of assets; (4) the reporting of asset sales; and (5) the choice of discretionary accruals. The study adopts both a portfolio and joint decision approach. The portfolio approach combines the earnings effects of the five choices into a single dependent variable and tests income smoothing, big bath, and debt hypotheses. The joint decision approach utilizes simultaneous equation methodology to investigate the interdependence of the five choices and the …
Date:
December 1997
Creator:
Nichols, Nancy Brown
System:
The UNT Digital Library
East, West, Somewhere in the Middle
A work of creative fiction in novella form, this dissertation follows the first-person travails of Mitch Zeller, a 26-year-old gay man who is faced with an unexpected choice. The dissertation opens with a preface which examines the form of the novella and the content of this particular work.
Date:
December 1997
Creator:
Behlen, Shawn Lee
System:
The UNT Digital Library
The Effect of Running Speed on VO2 Kinetics in the Severe Exercise Domain
There has been an interest in the kinetics of the V02 response during exercise at various intensities. However, most studies focus on the response of submaximal intensities whereas few studies have examined V02 kinetics at severe intensities. The purpose of this study was to evaluate the effect of exercise intensity on V02 kinetics over a range of severe intensities.
Date:
December 1997
Creator:
Williams, Christine Suzanne
System:
The UNT Digital Library