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The Function of Oral Tradition in Mary Lou's Mass by Mary Lou Williams (open access)

The Function of Oral Tradition in Mary Lou's Mass by Mary Lou Williams

The musical and spiritual life of Mary Lou Williams (1910 - 1981) came together in her later years in the writing of Mary Lou's Mass. Being both Roman Catholic and a jazz pianist and composer, it was inevitable that Williams would be the first jazz composer to write a setting of the mass. The degree of success resulting from the combination of jazz and the traditional forms of Western art music has always been controversial. Because of Williams's personal faith and aesthetics of music, however, she had little choice but to attempt the union of jazz and liturgical worship. After a biography of Williams, discussed in the context of her musical aesthetics, this thesis investigates the elements of conventional mass settings and oral tradition found in Mary Lou's Mass.
Date: August 1996
Creator: Fledderus, France
System: The UNT Digital Library
A Test of Alfred Chandler's Theory of Corporate Control (open access)

A Test of Alfred Chandler's Theory of Corporate Control

Alfred Chandler, in Scale and Scope: The Dynamics of Industrial Capitalism (1990), suggests that the acquisition of targets is an alternative to direct investment in research and development (R&D). Chandler suggests that the failure of accounting to recognize investment in R&D as an asset may have made R&D less attractive. This study focuses on the relationship between investment in R&D and capital expenditures and a set of partitions based on Chandler's three technology types ("hightech," "stable-tech," and "low-tech") and three possible merger activity classes (acquirer next year, target next year, and neither acquirer nor target next year). Chi-square contingency tables are used to test the independence of merger class and technology type, a frequency test. Regression is used to test the relationship between R&D and sales and between capital expenditures and sales, with the sample partitioned by technology type and by merger class in a 3-by-3 research design. The sample is 23,146 firm years from 1974-1988 for 2,659 firms categorized into industry groups based on Chandler's criteria. The financial data are from COMPUSTAT data files. The frequency of being an acquirer is the same for high-tech and stable-tech firms (11.2 versus 11.5 percent of firm years) and higher for low-tech …
Date: August 1996
Creator: Schmidt, George Leo
System: The UNT Digital Library
Characteristics of Four-Year Baccalaureate Hotel, Restaurant and Institutional Management Programs (open access)

Characteristics of Four-Year Baccalaureate Hotel, Restaurant and Institutional Management Programs

The research questions of this study were to determine the specific hotel, restaurant and institutional management courses offered as required and elective courses, to determine which hospitality management courses were taught by faculty members in the hospitality management program versus being taught by faculty in other programs, to determine the teaching methods used to present hospitality curriculum, and to determine the distance learning methods currently used.
Date: August 1996
Creator: Kirby, Allison D. (Allison Dawn)
System: The UNT Digital Library
Effects of Change Facilitator Styles on Elementary Teachers' Concerns about Adoption of Outcome-Based Education (open access)

Effects of Change Facilitator Styles on Elementary Teachers' Concerns about Adoption of Outcome-Based Education

The impact of change facilitator styles (CFS) on elementary teachers' stages of concerns (SoC) about adopting outcome-based education (OBE) in their schools was studied. The group studied was 266 teachers from the Texas Network for Outcome-Based Education. Principal styles are based on the Concerns-Based Adoption Model (CBAM. Styles were determined by the Change Facilitator Style Questionnaire, and teachers' concerns profiles were measured by the Stages of Concern Questionnaire. ANOVA and t tests were conducted to assess the effects of CFS at each of the seven stages of concern. ANOVA assessed teachers' educational level, experience with teaching and OBE, principal gender and type of community related to SoC. Chi-square addressed the relationship among the demographic variables and CFS. With schools as the unit of analysis, significant differences at stages 0,1,2 were found. When teachers were the unit of analysis, significant differences were found at stages 0,1,2, and 3. Concerns of teachers with Initiator style principals were significantly lower at these stages. All teachers demonstrated concerns typical of nonusers, indicating resistance to OBE. Concerns were significantly lower for teachers with master's degree than for bachelor's at stages 0 to 3. Teachers with the least experience with OBE had significantly higher concerns. Chi-square …
Date: August 1996
Creator: Waddell, Stephen F. (Stephen Fred)
System: The UNT Digital Library
Total Quality Environmental Management: A Study of the Relationship between Quality Practices and Environmental Performance of the Standard and Poor 500 Companies (open access)

Total Quality Environmental Management: A Study of the Relationship between Quality Practices and Environmental Performance of the Standard and Poor 500 Companies

The purpose of this study is to explore empirically the correlation of quality practices and environmental performance and suggest its applicability as a model for integrating the two fields.
Date: August 1996
Creator: Tomlin, Sharynn Musick
System: The UNT Digital Library
Comparative Study of the Bel Canto Teaching Styles and their Effects on Vocal Agility (open access)

Comparative Study of the Bel Canto Teaching Styles and their Effects on Vocal Agility

This thesis examines the historical significance of the vocal methods employed from the middle of the seventeenth century to the beginning of the nineteenth century in what became known as the bel canto era. It provides further exploration into the pedagogical procedures of the bel canto technique through a study of the premier instructors and singers from this period. The resurgence of interest in this tradition is addressed along with its impact on current vocal pedagogy. The vital role that vocal agility played as one of its most distinguishing traits is the primary factor under investigation. A discussion of the bel canto teaching styles in relation to their approach to agility is a major point of inquiry. By maintaining a link between present artists and pedagogues and the old Italian school, it helps the singer understand the historical implications of vocal agility as an integral part of healthy vocal development.
Date: August 1996
Creator: Harper, Portia
System: The UNT Digital Library
"Mislike Me not for My Complexion": Shakespearean Intertextuality in the Works of Nineteenth-Century African-American Women (open access)

"Mislike Me not for My Complexion": Shakespearean Intertextuality in the Works of Nineteenth-Century African-American Women

Caliban, the ultimate figure of linguistic and racial indeterminacy in The Tempest, became for African-American writers a symbol of colonial fears of rebellion against oppression and southern fears of black male sexual aggression. My dissertation thus explores what I call the "Calibanic Quadrangle" in essays and novels by Anna Julia Cooper, Frances Ellen Watkins Harper, and Pauline Elizabeth Hopkins. The figure of Caliban allows these authors to inflect the sentimental structure of the novel, to elevate Calibanic utterance to what Cooper calls "crude grandeur and exalted poesy," and to reveal the undercurrent of anxiety in nineteenth-century American attempts to draw rigid racial boundaries. The Calibanic Quadrangle enables this thorough critique because it allows the black woman writer to depict the oppression of the "Other," southern fears of black sexuality, the division between early black and white women's issues, and the enduring innocence of the progressive, educated, black female hero ~ all within the legitimized boundaries of the Shakespearean text, which provides literary authority to the minority writer. I call the resulting Shakespearean intertextuality a Quadrangle because in each of these African-American works a Caliban figure, a black man or "tragic mulatto" who was once "petted" and educated, struggles within a …
Date: August 1996
Creator: Birge, Amy Anastasia
System: The UNT Digital Library
Neuropsychological Deficits Associated with Silicone Gel Breast Implants (open access)

Neuropsychological Deficits Associated with Silicone Gel Breast Implants

Thirty-two silicone breast implant patients scored in the mild to moderate range of impairment on the Halstead-Reitan Neuropsychological Battery. An unusual number of patients had positive tests for antinuclear antibody on immunological testing and a high incidence of EEG abnormalities were found. Personality testing revealed an MMPI profile which is typical for neuropsychologically impaired subjects but components were consistent with extreme emotional distress. None of the subjects were near the cutoff score for malingering or faking bad on the F-K index of the MMPI. There was no apparent relationship between length of exposure and the severity of neurological impairment. Also, explanted subjects performance was not improved when compared to subjects whose implants were still in place.
Date: August 1996
Creator: Kasper, Mary E. (Mary Elizabeth)
System: The UNT Digital Library
Computer Simulations of Dilute Polymer Solutions: Chain Overlaps and Entanglements (open access)

Computer Simulations of Dilute Polymer Solutions: Chain Overlaps and Entanglements

Chain conformations and the presence of chain overlaps and entanglements in dilute polymer solutions have been analyzed. The fundamental problem of existence of chain overlaps in dilute solutions is related to the drag reduction phenomenon (DR). Even though DR occurs in solutions with the concentration of only few parts per million (ppm), some theories suggest that entanglements may play an important role in DR mechanism. Brownian dynamics technique have been used to perform simulations of dilute polymer solutions at rest and under shear flow. A measure of interchain contacts and two different measures of entanglements have been devised to evaluate the structure of polymer chains in solution. Simulation results have shown that overlaps and entanglements do exist in static dilute solutions as well as in solutions under shear flow. The effect of solution concentration, shear rate and molecular mass have been examined. In agreement with the solvation theory of DR mechanism, simulation results have demonstrated the importance of polymer + polymer interactions in dilute solutions.
Date: August 1996
Creator: Drewniak, Marta
System: The UNT Digital Library
Patterns of Vision, Action, and Effects in Professional Development as Experienced in the Texas Centers for Professional Development and Technology (open access)

Patterns of Vision, Action, and Effects in Professional Development as Experienced in the Texas Centers for Professional Development and Technology

In 1992, the state of Texas awarded a number of inducement grants to collaboratives of universities, schools, and service centers to develop field-based professional development schools (PDSs) and provide preservice and inservice teachers with extensive professional development. This study investigated the design and effects of the professional development models in these Texas Centers for Professional Development and Technology (CPDTs). This study used qualitative data collection and analysis procedures. Raw data were collected in the form of individual interviews, focus group interviews, documentation, and fieldnotes. Forty-six interviews were completed involving a total of 83 respondents representing all partnering entities: university representatives, school representatives, education service center representatives, and policymakers. Documentation included annual and quarterly reports, grant applications, and program approval requests. Fieldnotes included observational data from site visits. Data analysis was an iterative process using a constant comparative analysis of coded categories emerging fromtranscribed data. This comparison examined: the vision of professional development as perceived by the respondents, the enactment of professional development as experienced by the respondents, and the effects that the CPDT initiative had on professional development as perceived by the respondents. This study revealed 18 themes that were common across all eight Texas CPDTs. The themes revealed patterns …
Date: August 1996
Creator: Kjelgaard, Peggy Anne
System: The UNT Digital Library
Life Stress, Coping, and Social Support in Adolescents: Cultural and Ethnic Differences (open access)

Life Stress, Coping, and Social Support in Adolescents: Cultural and Ethnic Differences

Although much research has examined the impact of life stress and the subsequent development of health symptoms, most of this research has been done with White middle class adults. Similar to the adult research, life stress research with children and adolescents has focused on White middle class individuals. The present study expands the knowledge about the stress process in ethnic/racial adolescents while controlling for the effects of SES. A sample population consisting of 103 Black students, 129 Hispanic students, and 105 White students was compared with respect to stressful events experienced, coping strategies, and social support. Students from a wide range of socioeconomic backgrounds were included within each ethnic/racial group studied. After experimentally and statistically controlling for the effects of socioeconomic status, significant differences were observed. Black and Hispanic students reported receiving higher levels of Enacted Social Support (actual support) than White students. Contrary to what has been previous suggested, Black and Hispanic students reported having experienced fewer stressful life events than White students. Other ethnic/racial group differences that emerged included differences in ways in which specific patterns of moderator variables served to enhance the relationship between life stress and psychological symptomatology.
Date: August 1996
Creator: Prelow, Hazel (Hazel M.)
System: The UNT Digital Library
Masculine Gender Role Conflict: Effects on College Men's Scores of Psychological Well-Being, Chemical Substance Usage, and Attitudes toward Help-Seeking (open access)

Masculine Gender Role Conflict: Effects on College Men's Scores of Psychological Well-Being, Chemical Substance Usage, and Attitudes toward Help-Seeking

This purpose of this study was to investigate the effects of Gender Role Conflict upon college men's scores of psychological well-being, substance usage, and attitudes toward psychological help-seeking. It was found that the Success, Power, and Competition variable of Gender Role Conflict was the one variable that was consistently related to the measures of interest. Moreover, it was found to be significantly related to a decrease in psychological well-being, including Trait Anger, Angry Reaction subtype of trait anger, Angry Temperament subtype of trait anger, and Trait Anxiety. It was also found that this same variable was significantly related to increased reports of alcohol usage. Where as four of the possible five Gender Role Conflict variables were related to a negative attitude toward help-seeking, the Success, Power, and Competition variable was most heavily weighted.
Date: August 1996
Creator: Blazina, Christopher (Christopher Douglas)
System: The UNT Digital Library
Traditional Medicine: a Blessing or Bane? The Case of Ghana (open access)

Traditional Medicine: a Blessing or Bane? The Case of Ghana

The study examines the socio-demographic characteristics of Traditional Medical Practitioners in Ghana. Their attitudes towards collaboration with biomedical practitioners, their associations, and regulation is also discussed. Data for the study was obtained from a Survey of Traditional Medical Practitioners in Ghana.
Date: August 1996
Creator: Sakyi-Addo, Isaac
System: The UNT Digital Library
Acculturation in African American College Women and Correlates of Eating Disorders (open access)

Acculturation in African American College Women and Correlates of Eating Disorders

Although eating disorders have been the focus of much research, the inclusion of minority populations has been minimal. A recent review of the literature by Dolan (1991) has found that eating disorders were most likely to be present in non-White women who were exposed to Western societies and cultures. Thus, the purpose of this study was to examine personality, physical, and cultural correlates of bulimic symptomatology in a sample of African American college women. The Bulimia Test Revised (BULIT-R) was used to assess bulimia symptoms. The African American Acculturation Scale (AAAS), the Beliefs about Attractiveness Scale Revised (BAAR factors 1 and 2), the Rosenberg Self-Esteem Scale (SES), the Centers for Epidemiological Depression Scale (CES-D), Body Parts Satisfaction Scale (BPSS), and body mass were the independent variables hypothesized to predict bulimic symptoms. Hierarchical regression analysis revealed that body mass, depression, and low self-esteem were the best predictors of bulimic symptomatology, together accounting for 38% of the variance. Beliefs about attractiveness and body satisfaction were related to bulimic symptoms but not when considered simultaneously with the other variables. Acculturation was not predictive of bulimic symptoms. 0-ordered correlations revealed that beliefs about attractiveness and body satisfaction were correlated with bulimic symptoms. Acculturation was …
Date: August 1996
Creator: Lester, Regan
System: The UNT Digital Library
Tensor Products of Banach Spaces (open access)

Tensor Products of Banach Spaces

Tensor products of Banach Spaces are studied. An introduction to tensor products is given. Some results concerning the reciprocal Dunford-Pettis Property due to Emmanuele are presented. Pelczyriski's property (V) and (V)-sets are studied. It will be shown that if X and Y are Banach spaces with property (V) and every integral operator from X into Y* is compact, then the (V)-subsets of (X⊗F)* are weak* sequentially compact. This in turn will be used to prove some stronger convergence results for (V)-subsets of C(Ω,X)*.
Date: August 1996
Creator: Ochoa, James Philip
System: The UNT Digital Library
Martin Scorsese, Quentin Tarantino, and the Crime Films of the Nineteen Nineties (open access)

Martin Scorsese, Quentin Tarantino, and the Crime Films of the Nineteen Nineties

Martin Scorsese's films, GOODFELLAS and CASINO, and Quentin Tarantino's RESERVOIR DOGS and PULP FICTION are examined to determine if the crime film of the 1990s has become increasingly more in the style of film noir. The differences and similarities between the two crime films each director has either written or co-written in the 1990s are delineated to demonstrate this trend. Other crime films of the latter 1990s (SEVEN, THE USUAL SUSPECTS, and MULHOLLAND FALLS) are also examined to aid in defining the latest incarnation of the crime film as "Noir Modernist," a term that is demonstrated to be a more accurate description for the current crime films than B. Ruby Rich's, "Neo-Noir of the 1990s."
Date: August 1996
Creator: Magnani, Matthew Daniel
System: The UNT Digital Library
Adult Discouragement: Parents of Children with Craniofacial Anomaly (open access)

Adult Discouragement: Parents of Children with Craniofacial Anomaly

The Discouragement Scale for Adults (DSA) was developed to assess for the Adlerian construct of discouragement in adults age 18 years and over. Data were collected from three samples: norm (n=586), presumed discouraged (n=47), and parents of children with craniofacial anomaly (n=105). Five subscales corresponding to life tasks identified in Adlerian literature as work, love, society, self-significance, and spirituality underlie the 60 item DSA. Item selection was based on ratings by five notable Adlerians and item correlations with scale scores. Gender, age, and ethnicity norms were established for the norm, presumed discouraged, and craniofacial samples. Across three samples, no significant ethnic differences were found. Normative findings indicated females are less discouraged than males on the Total DSA, the society and spirituality subscales. Age findings indicated the 18-34 year old sample is more discouraged than other ages on the Total DSA, the work, society, and spirituality subscales. Presumed discouraged findings indicated females are less discouraged than males on the society subscale. Craniofacial findings indicated females are less discouraged on the society subscale, but more discouraged on the self-significance subscale than males. Age findings indicated the 18-34 year old sample is more discouraged than other ages on the self subscale. Research on …
Date: August 1996
Creator: Jones, Melissa Taylor Watson
System: The UNT Digital Library
Career Paths of Board-Certified Clinical Specialists in Geriatric Physical Therapy with Implications for Higher Education (open access)

Career Paths of Board-Certified Clinical Specialists in Geriatric Physical Therapy with Implications for Higher Education

Geriatric board-certified specialists (GCSs) address health care needs of the growing geriatric population. The study's purposes were to: examine career paths of GCSs, identify influencing factors, and explore implications for higher education. Twelve of 14 original 1992 GCSs participated. Data included document collection and interviews. Using a qualitative methodology, commonalities were sought among individuals and HyperRESEARCH software was used for data management. The participants were adventurous, valued education, and were enthusiastic about physical therapy (PT), geriatrics, and specialization. Their career path began with choosing PT as a career, professional education, and their first job. One GCS moved directly into geriatrics. Others went to different settings before geriatrics. As participants recognized they "fit" in geriatrics, they pursued postprofessional education to increase knowledge before choosing board certification. In choosing PT, volunteer experience and personal research were common influences. In choosing to work with elders, influences throughout life gradually built a social context supporting the decision. GCSs chose specialist certification to assist in professionalization of geriatric PT, because they were highly skilled, for career advancement, and for self professionalization. Specialist certification had few financial consequences. Participants gained friends and professional networks. They experienced improved patient care, increased educational opportunities, and/or increased professional service. …
Date: August 1996
Creator: Thompson, Mary E., 1958-
System: The UNT Digital Library
The Influence of Change in Organizational Size, Level of Integration, and Investment in Technology on Task Specialization (open access)

The Influence of Change in Organizational Size, Level of Integration, and Investment in Technology on Task Specialization

Major changes in organizational structural paradigms have been occurring. Recent journal articles propose that the older philosophies of expanding organizations and increasing internal specialization are no longer viable means to enhance competitiveness as espoused in earlier journal articles. Downsizing, rightsizing, and business process reengineering have all been used as methods of accomplishing organizational work force reduction (OWFR) and enhancing organizational posture. It has been established that as organizations grow, specialization increases. Causes for OWFR have not been established nor have effects upon structure been studied. Previous structural factor studies have focused upon organizations engaged in end-game strategies done during periods of internal and economic growth. This study evaluates the impacts of OWFR and its relationship to the structural factor of specialization during a non-munificent economic period. Three independent variables, dis-integration, change in the number of employees, and change in technology, were used as measures to determine whether specialization decreased when organizations downsized. The dependent variable, specialization, was obtained through a pre-tested questionnaire. The three independent variables were obtained using the Compustat data base as a secondary source of information. The Compustat data was verified using data from Compact Disclosure. Questionnaires were mailed to fifty-one fully integrated oil companies. Forty were …
Date: August 1996
Creator: Tucci, Jack E. (Jack Eugene)
System: The UNT Digital Library
Soloistic Writing for the Oboe in the Arias of Handel's Operas, with Three Recitals of Selected Works by Marcello, Strauss, Ravel, Bach, Handel, Saint-Saens and Others (open access)

Soloistic Writing for the Oboe in the Arias of Handel's Operas, with Three Recitals of Selected Works by Marcello, Strauss, Ravel, Bach, Handel, Saint-Saens and Others

Although long-neglected, the topic of Handel's operatic oeuvre has in recent years gained new currency. Of interest to oboists is the great amount of soloistic writing for the oboe in the arias of his operas which takes the form of obbligato solos. From this body of works approximately twenty operas contain soloistic writing for the oboe in conjunction with the voice. The rationale for the investigation of this topic is two-fold: first, to make oboists aware of the availability of this body of literature, and second, to explore the manner and extent to which Handel used the oboe as an obbligato instrument. Topics covered include the instrumental make-up of Handel's orchestra and a brief history of the obbligato aria beginning with the early trumpet arias. An examination of Handel's compositional technique precedes a detailed analysis of six examples of varying style. The conclusion considers the aesthetics of performing these pieces out of context in light of historical practice and perception.
Date: August 1996
Creator: Hiramoto, Stephen Anthony
System: The UNT Digital Library
The Influence of Family Functioning on Identity Formation: a Model of Late Adolescent Identity Development (open access)

The Influence of Family Functioning on Identity Formation: a Model of Late Adolescent Identity Development

The influence of theoretically prominent family processes on late adolescent college student identity development was the focus of this study. The primary purpose was to test a model of adolescent identity development. This model proposed that family health variables would predict identity development, and that attachment and separation-individuation would each make unique and additive contributions to identity development. The second purpose was to identify instruments which discretely measured the family processes. The third purpose was to better understand family influences by measuring the processes of exploration and commitment. Participants were 150 male and 150 female college students, between the ages of 18 and 23, and from intact families. Questionnaires completed measured family functioning and identity development. Family functioning measures covered three domains (family health, attachment to parents, and separation-individuation) which formed the set of independent variables. The identity measures (ego identity status and identity process) comprised the dependent variables. A hierarchical regression design was employed where family health variables were entered first, followed by attachment variables, then separation-individuation variables. The results indicated mixed support of the model. First, the proposed model was statistically supported for females as all domains predicted identity achievement and diffusion. For males, only family health predicted …
Date: August 1996
Creator: George, David T. (David Titus)
System: The UNT Digital Library
A Revised Instruction Set for the Booklet Category Test (open access)

A Revised Instruction Set for the Booklet Category Test

Eighty-eight (N = 88) non-brain-injured adults were tested with one of two versions of the Booklet Category Test (BCT). Forty-four (N = 44) individuals were tested with the standard version of the BCT, and forty-four (N = 44) were tested with a revised BCT in which between-subtest cueing was removed, called the Noncued Category Test (NCT). The results of this study indicate that removal of cueing instructions changes the Category test significantly. Subjects administered the NCT scored significantly more errors than those who were administered the standard Category test. While BCT scores correlated significantly with nonverbal intelligence scores, NCT scores did not. However, the difference in these correlations was not significant, indicating that the intelligence aspect measured in the two versions is not different. Neither the BCT nor the NCT correlated significantly with the Wisconsin Card Sort, Word Fluency, Stroop, or Trail Making Test. It is recommended that the NCT be administered to circumscribed clinical populations in order to best utilize present findings.
Date: August 1996
Creator: Rockers, Daniel M.
System: The UNT Digital Library
Charge State Dependence of L-Shell X-Ray Production Cross Sections of ₂₈Ni, ₂₉Cu, ₃₀Zn, ₃₁Ga, and ₃₂Ge by Energetic Oxygen Ions (open access)

Charge State Dependence of L-Shell X-Ray Production Cross Sections of ₂₈Ni, ₂₉Cu, ₃₀Zn, ₃₁Ga, and ₃₂Ge by Energetic Oxygen Ions

Charge state dependence of L-shell x-ray production cross sections have been measured for 4-14 MeV ¹⁶O^q (q=3⁺-8⁺) ions incident on ultra-clean, ultra-thin copper, and for 12 MeV ¹⁶O^q (q=3⁺-8⁺) on nickel, zinc, gallium and germanium solid foils. L-shell x-ray production cross section were measured using target foils of thickness ≤0.6 μg/cm² evaporated onto 5 μg/cm² carbon backings. Oxygen ions at MeV energies and charge state q were produced using a 3MV 9SDH-2 National Electrostatics Corporation tandem Pelletron accelerator. Different charge states, with and without K-vacancies, were produced using a post acceleration nitrogen striping gas cell or ¹²C stripping foils. L-shell x-rays from ultra-thin ₂₈Ni, ₂₉Cu,₃₀Zn,₃₁Ga, and ₃₂Ge targets were measured using a Si(Li) x-ray detector with a FWHM resolution of 135 eV at 5.9 keV. The scattered projectiles were detected simultaneously by means of silicon surface barrier detectors at angle of 45° and 169° with respect to the beam direction. The electron capture (EC) as well as direct ionization (DI) contributions were determined from the projectile charge state dependence of the target x-ray production cross sections under single collision conditions. The present work was undertaken to expand the measurements of L-shell x-ray production cross sections upon selected elements with low …
Date: August 1996
Creator: Azordegan, Amir R. (Amir Reza)
System: The UNT Digital Library
Kinetic Studies of the Reactions of Alkyl and Silyl Hydrides (open access)

Kinetic Studies of the Reactions of Alkyl and Silyl Hydrides

The Kinetics of the reactions involving alkyl and silyl hydrides were studied by the flash photolysis / resonance fluorescence technique. The reactions of alkyl radicals (R = C₂H₅, i-C₃H₇, t-C₄H₉) with HBr have been studied at room temperature and the rate constants obtained (units are in cm³ s^-1 ) are: k₃.₃ = (7.01 ± 0.15) x 10^-12, k₃.₂ = (1.25 ± 0.06) x 10^-11, k₃.₁ = (2.67 ± 0.13) x 10^-11 These results, combined with previously determined reverse rate constants and other kinetic information, yield bond dissociation enthalpies (units in kJ mol^-1) at 298 K : primary C-H in C₂H₅-H (423.6 ± 2), secondary C-H in i-C₃H₇-H (409.9 ± 2), tertiary C-H in t-C₄H₉-H (405.1 ± 2). These rate constants and bond energies are in good agreement with previous results.
Date: August 1996
Creator: Yuan, Jessie (Jessie Win-Jae)
System: The UNT Digital Library