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Acoustical Characterization And Parameter Optimization Of Polymeric Noise Control Materials, Emile N. Homsi

Dissertations

The sound transmission loss (STL) characteristics of polymer-based materials are considered. Analytical models that predict, characterize and optimize the STL of polymeric materials, with respect to physical parameters that affect performance, are developed for single layer panel configuration and adapted for layered panel construction with homogenous core. An optimum set of material parameters is selected and translated into practical applications for validation.

Sound attenuating thermoplastic materials designed to be used as barrier systems in the automotive and consumer industries have certain acoustical characteristics that vary in function of the stiffness and density of the selected material. The validity and applicability …

Closed-Loop Control Of Vortex Shedding By Means Of Lorentz Force, Xiaoyun Sun

Dissertations

When an incompressible fluid flows past a circular cylinder, vortex shedding occurs as soon as the Reynolds number exceeds about 40. Vortex shedding is usually undesirable, as it generates a significant increase in drag, as well an oscillating lift force on the cylinder leading to cross-stream structural vibrations. Flow control to either delay the appearance of vortex shedding or fully suppress it has attracted much attention during the last decade. The focus of this dissertation is to control vortex shedding from a circular cylinder by applying an external electromagnetic field. As in previous works, the latter is generated by electrodes …

Packet Data Communications Over Coded Cdma With Hybrid Type-Ii Arq, Seokhyun Yoon

Dissertations

This dissertation presents in-depth investigation of turbo-coded CDNIA systems in packet data communication terminology. It is divided into three parts; (1) CDMA with hybrid FEC/ARQ in deterministic environment, (2) CDMA with hybrid FEC/ARQ in random access environment and (3) an implementation issue on turbo decoding.

As a preliminary, the performance of CDMA with hybrid FEC/ARQ is investigated in deterministic environment. It highlights the practically achievable spectral efficiency of CDMA system with turbo codes and the effect of code rates on the performance of systems with MF and LMMSE receivers, respectively. For given ensemble distance spectra of punctured turbo codes, an …

Evaporating Crossflow Sprays In Gas-Solid Flows, Guangliang Liu

Dissertations

Injection of evaporating sprays into gas-solid flows is encountered in many engineering processes such as energy production industry and chemical industry. The phenomenon involves phase change, three-phase interactions, heat and mass transfer. All of these characteristics control the process efficiency, pollutant production and product quality. However, very limited studies are available on the evaporating spray jets in gas-solid flows, especially on the spray evaporation rate within a gas-solid medium. A combined study of experiments and theoretical analysis has been carried out here to investigate the fundamental mechanism of evaporating Crossflow spray jets in gas-solid flows.

In this study, in addition …

Thermochemistry And Kinetics In Pyrolysis And Oxidation Of Oxygenated Chlorocarbons And Chlorinated Aromatics, Li Zhu

Dissertations

Thermochemical. properties, Δf_H°₂₉₈, S°₂₉₈, and Cp°(T) (5<=T/K<=6000), are determined using different ab inifio and density functional theory methods for three chloromethyl radicals, CH₂Cl, CHCl₂, CCl₃, all chlorobenzenes from monochlorobenzene to hexachlorobenzene, and all chlorophenols from ortho-, meta-, para-chlorophenol to pentachlorophenol. The B3LYP/6-31G(d,p) method is used in the structure optimization. The B3LYP/6-31G(3df,2p), QCISD(T)/6-3 I G(d,p), and CB S-Q methods are used in single point calculations of total electronic energies. Harmonic vibration frequencies are scaled for zero point energies and thermal corrections. Isodesmic reaction(s) are utilized at each calculation level to determine Δf_H°₂₉₈ of each species. Contributions to S°₂₉₈ and Cp°(T) from …

Robust And Efficient Video/Image Transmission, Xi Min Zhang

Dissertations

The Internet has become a primary medium for information transmission. The unreliability of channel conditions, limited channel bandwidth and explosive growth of information transmission requests, however, hinder its further development. Hence, research on robust and efficient delivery of video/image content is demanding nowadays.

Three aspects of this task, error burst correction, efficient rate allocation and random error protection are investigated in this dissertation. A novel technique, called successive packing, is proposed for combating multi-dimensional (M-D) bursts of errors. A new concept of basis interleaving array is introduced. By combining different basis arrays, effective M-D interleaving can be realized. It has …

“You Are With Someone Who Is A Fighter”: Constructing A Model Of Transformation Which Can Occur In Surviving Breast Cancer, Helen Hays Eckmann Edd

Dissertations

The American Cancer Society estimated a quarter of a million women would be diagnosed with breast cancer in 2002. For each of those, another ten women are living with or have survived this disease. At diagnosis, most women view their futures with dread. As with other extreme traumas, the diagnosis of breast cancer can bring profound transformation (Jackson, 1983; LeShan, 1994; O'Brien, 1995). In this study, seven survivors of breast cancer articulate their journeys through this disease and detail how they were able construct transformed lives. The women described how they turned tragedy into triumph. Individual interviews were conducted and …

Making The Transition From The Field To The Classroom: The Experiences Of Novice Health Care Instructors At Private Career Colleges, Lezlee Haroun Edd

Dissertations

Health care instructors at private career colleges are responsible for training thousands of health services workers who enter the American work force annually. The number of students seeking health care occupational training at career colleges is expected to increase significantly during the next decade because the health service industry is the fastest growing section of the United States economy. At the same time, the public education system does not have the capacity to fully accommodate the future population of students seeking the postsecondary education required for these jobs. Instructors at private career colleges are typically hired directly from professional positions …

Higher Education Administrators And Students With Disabilities: A Survey Of Administrator Knowledge And Training Needs, Maribel S. Guillermo Edd

Dissertations

Students with disabilities enroll in two-year institutions at a higher rate than in four-year institutions. The California community college system, which is the largest system of higher education in the world, enrolled 2,609,365 students with disabilities during the 2000–2001 academic year. The purpose of this study was to focus on California college administrators and their role in: (a) setting a climate that supports students with disabilities and (b) serving as a resource to faculty and staff. Administrators were surveyed regarding their (a) current knowledge and training needs; (b) personal and professional experience with individuals with disabilities; and (c) utilization of …

W. E. B. Du Bois's “Talented Tenth”: A Pioneering Conception Of Transformational Leadership, Ella F. Sloan Edd

Dissertations

In 1903, W. E. B. Du Bois presented a radical leadership proposal for the transformation of African American life in the United States. His theoretical concept of the “Talented Tenth” emphasized the education and training in leadership of ten percent of the African-American population. This selective group would transform the larger, uneducated segment of the population and lead them to higher levels of social acceptance and independence. This study is a historical investigation into the educational ideas of W. E. B. Du Bois's “Talented Tenth.” It describes the historical factors that led to and influenced Du Bois's development of the …

Leadership Behaviors And Communication Satisfaction: Community Colleges In Micronesia, Julie M. Ulloa-Heath Edd

Dissertations

The major purpose of this study was to examine the satisfaction of Micronesian community college faculty with communication and their perception of their department chair's leadership style. Specifically, this study examined (a) the relationship of communication satisfaction with leadership and demographic data; (b) the relationship between the Multifactor Leadership Questionnaire (MLQ) subset and the scales of the Communication Satisfaction Questionnaire (CSQ); (c) the difference between institutions in terms of satisfaction with communication or perception of leadership style; and (d) suggestions for improving communication. Significant relationship was found between the overall communication satisfaction with leadership quality and ethnicity. The data revealed …

Teachers' And Students' Perceptions Of Seventh- And Eighth-Grade Science Education In A Selected Seventh-Day Adventist Union Conference, Marcel Andre Sargeant

Dissertations

Problem. Science education has long been a great concern in the United States, where less than one-third of the students perform at or above the proficient level. The purpose of this study was to investigate the status of the science program in a selected Union Conference of the Seventh-day Adventist school system. Specifically, this study investigated the perceptions of teachers and students regarding the extent to which the science program meets the criteria of the National Commission on Mathematics and Science Teaching for the 21st century and to what extent these criteria are related to academic performance as indicated by …

Leadership Development: Continuous Improvement Through Character Assessment, Robert Scott Clark Edd

Dissertations

One of the keys to personal development is self-awareness as assessed by instruments such as the Myers-Briggs Type Indicator (MBTI) and the NEO PI-R, both of which are widely accepted reliable and valid indicators and measures of personality type. However, assessing the part of personality known as character presents challenges that are not adequately addressed by today's popular instruments leaving information needed for development incomplete or unavailable. An instrument that provides a reliable and valid assessment of character for leadership and personal development purposes could be very valuable. Qualitative methods were used for this study to investigate leaders' perceptions of …

A Study Of Technology Implementation In Two School Districts: The Dynamics Of Leadership And Change, Rebecca D. Gillespie Edd, Ma, Ba

Dissertations

This qualitative case study investigated the role administrative leadership plays in organizational change related to the infusion of technology into district programs and pedagogical practices. School districts have been engaged in a struggle to incorporate new generations of technological advancements in meaningful ways for their students. Instructional reform and measurable performance-based outcomes are frequently conflated with the pressure to implement effective technology programs that ensure the No Child Left Behind federal mandates are met while ensuring judicious use of district funds. While technology has the potential to transform the educational process, it must align with the cultural uniqueness of the …

Perceptions Of Principal Effectiveness And Teacher Morale: A Study Of Public Secondary School Teachers On Guam, Michelle M.S. Santos Edd

Dissertations

For more than a decade, the public schools on Guam have suffered from low student test scores, high turnover rates and low levels of teacher morale. Although there may be many explanations for this persistent problem, an important part of any solution is improving the overall level of teacher morale, which of course, can be influenced in many ways by the actions of the principal. In an effort to determine both the level of teacher morale among secondary school teachers on Guam as well as the factors that may help explain it, including the perceived level of principal effectiveness, this …

The Contribution Of Education, Experience, And Personal Characteristics On The Reflective Judgment Of Students Preparing For School Administration, Margaret Rae Macdonald

Dissertations

Problem. School administrators must use high levels of reasoning to deal with the complexities of today's educational system. Reflective thinking has proven to be an effective administrative tool in problem solving, staff supervision, and school improvement, yet preparation programs for school administrators have limited knowledge about what contributes to reflective judgment in their students, thus making it difficult to develop curriculum and pedagogy to enhance reflection.

Method. The Reflective Judgment Model provides the theoretical framework for this mixed methods research design that explores contributory variables that contribute to the reflective judgment of educational leadership students. The Reasoning about Current …

The Effects Of Cooperative Learning Versus Traditional Classroom Instruction On Cognitive Achievement, Critical Thinking, And Attitudes Toward Learning In Teams In A Physician Assistant Program, Scott L. Massey

Dissertations

Problem. Physician assistants are required to possess critical thinking skills and excellent intellectual skills to achieve the level of autonomy expected by supervising physicians. No scientific research has been identified to determine the most effective means of educating the physician assistant students. The purpose of the research study was to determine whether a statistical difference exists between students educated in a cooperative learning environment versus a traditional lecture environment. The dependent variable utilized in this study included critical thinking skills, cognitive achievement, and attitudes towards learning in teams. Using an experimental research design, students were educated in a cooperative learning …

Fixing The Hole In The Pipe : Moving Beyond Prereferral Toward Changing The System, Jean T. Papandrea

Dissertations

Problem

Too many students in school districts across the nation fail and are inappropriately referred for special education classification and services, when, in reality, they are not disabled, but are casualties of systems that do not have appropriate instructional intervention and support systems in place. This study explores the outcomes of an Instructional Support system called the 7 SHARE Initiative. Essential system components are: (a) Instructional Support Teachers (ISTs) in each school, (b) Curriculum-Based Assessment as developed by Edward E. Gickling, (c) direct instruction of strategies to students, and (d) modeling strategies for teachers to implement in class-wide applications.

Method …

Job Satisfaction And Its Relationship To Organizational Commitment And Religious Commitment For Andrews University Employees, Ralph Schroder

Dissertations

Problem. Relatively few studies have examined job satisfaction and its intrinsic and extrinsic facets for religious private universities. Andrews University seems to benefit from an identification of factors contributing to job satisfaction, and a measurement of its employees’ organizational and religious commitment. This study can clarify whether religious commitment has a potentially mediating effect on the relationship between job satisfaction and organizational commitment.

Method. As part of this quantitative research study a survey questionnaire was mailed out to all 976 Andrews University employees’ which measured levels of overall, intrinsic, and extrinsic job satisfaction as well as organizational and religious commitment. …

The Impact Of Early-Intervention/Prevention Services On The Northville Public Schools, Robert O. Sornson

Dissertations

Problem

Whereas some school districts have continued to observe high rates of reading failure and increasing rates of special education identification, others have looked at program or system changes to reduce early learning failure. This study is an analysis of the impact of early intervention practices in the elementary schools of an upper-middle-class community.

Method

Cost analyses of district programs were compared to a hypothetical district with state average levels of special education identification. Special Education eligibility rates were tracked over a 10-year period. Data were collected from surveys given to Instructional-Support Team personnel, general education teachers, elementary administrators, and …

Differential Perceptions Of Teachers And Students About The Teaching And Learning Of History In Secondary Schools Of Trinidad And Tobago, Stephen Joseph

Dissertations

Problem. Students at the upper secondary-school level sometimes experience difficulties understanding basic historical concepts as well as appreciating the relevance of history as a subject in the school's curriculum. While these students are capable of formulating perspectives of their own, teachers often find it necessary to guide students' thinking toward an accepted paradigm (scholarly concept) of history. The problem is that there are mismatched paradigms that teachers need to bring together in order to establish a foundation for a scholarly approach to history.

This study seeks to identify different conceptual frameworks that exist in students' thinking about history. It …

Paul's Use Of Canonical And Noncanonical Wisdom Literature In Romans And The Corinthian Letters, Tadashi Ino

Dissertations

Problem . Although Paul's use of wisdom literature has been widely acknowledged, the relationship between the apostle and wisdom literature has not been thoroughly investigated. Scholars have tended to deal mainly with the function of wisdom traditions in general in Paul's argument. Furthermore, no one has compared his use of canonical and noncanonical wisdom literature. This present study sought to determine the nature of Paul's use of wisdom literature by comparing his use of canonical wisdom books (Job, Proverbs, and Ecclesiastes) with his use of noncanonical ones (Sirach and the Wisdom of Solomon) in Romans, and 1 and 2 Corinthians. …

Incarnation And Covenant In The Prologue To The Fourth Gospel (John 1:1-18), Wilson Paroschi

Dissertations

Most scholars would agree that the Prologue to the Fourth Gospel--as John 1:1-8 is usually called--introduces Jesus Christ as a divine, pre-existent being who at a certain point in time was made flesh and lived among humans. No agreement, however, exists on the point in the narrative at which the shift from one state to the other takes place. As John the Baptist is mentioned in vss. 6-8, many think that the following verses refer to the ministry of the incarnate Christ, while others, struck by the explicitness of vs. 14, argue that this verse marks the transition from pre-existence …

A Comparison Of The Emotional Indicators On The House-Tree-Person Drawings And The Kinetic-House-Tree-Person Drawing, Denise Ann Stoddard

Dissertations

Problem. Robert Burns, author of the Kinetic-Family- Drawing, - has devised a projective test called the Kinetic-House-Tree-Person drawing. He has taken the House-Tree-Person projective technique and changed the instructions to include all of the figures on one page and also to include an action. In Burns's book on the K-H-T-P he claimed that his drawing gives a better clinical picture of the subject than the H-T-P. However, there is no research that compares the two tests for clinical information.

Method. The H-T-P and K-H-T-P were administered to 204 college students 18 years of age and older. These students came …

A Study Of The Relationship Between Followership Modalities And Leadership Styles Among Educators At Selected High Schools In Jackson, Mississippi, Joyce Elaine Johnson

Dissertations

Problem. The purpose of this study was to explore the nature of the relationship between followership modalities and leadership styles. High-school teachers and principals in the Jackson Public School District in Jackson, Mississippi, participated in the study.

Method. Methodological triangulation that combined quantitative and qualitative methods served as the study's research design. A 45-item Multifactor Leadership Questionnaire (MLQ Form 5x-Short), developed by Bass and Avolio (1995), and a well-established measure of leadership style, was administered to the principals.

A 20-item, self-diagnostic questionnaire, developed by Robert Kelley, designed to measure followership modalities, was administered to the high school teachers who …

Geochemical And Isotopic Characteristics Associated With High Conductivities In A Shallow Hydrocarbon-Contaminated Aquifier, Franklyn D. Legall

Dissertations

In-situ vertical resistivity probes (VRPs) deployed at a hydrocarboncontaminated site in SW Michigan showed high soil conductivities within the contaminated zone. Within this zone, different phases of hydrocarbon impact were recognized, namely, zones with residual and dissolved phase hydrocarbons (RDH) and zones where these phases coexist with free product (RDFH). Bulk soil conductivities were highest ( 12 to 30 mS/m) in the zone with RDFH compared to the RDH zone (10 to 25 mS/m). Groundwater chemistry and stable carbon isotope data from closely spaced vertical samples within the anomalous conductive zones were used to provide evidence for biodegradation and to …

Predicting A Passing Outcome On The National Council Licensure Examination For Registered Nurses By Associate Degree Graduates, Patricia M. Collins

Dissertations

This ex-post facto study was conducted to determine whether grades in pre-program science courses, pre-program cumulative grade point average (GPA) and grades in selected nursing theory courses predict pass/fail performance on the National Council Licensure Examination for Registered Nurses (NCLEX-RN) for graduates of an Associate Degree Nursing (ADN) program. A small, rural community college in western Michigan participated in the study. The subjects included 159 graduates, (143 females, 16 males) admitted to the program beginning fall semester 1992 through May 2001. Data was obtained from the college data files. The independent variables were the four pre-program science courses, Anatomy and …

Geoelectrical Response Of An Aged Lnapl Plume: Implications For Monitoring Natural Attenuation, Douglas D. Werkema Jr.

Dissertations

The geoelectric stratigraphy at a site impacted with light non-aqueous phase liquids (LNAPLs) is investigated for its link to natural biodegradation, its contribution to the conductive model for aged (i.e. mature) LNAPL contaminated sites, and the relationship to the natural hydrologic regime. The highest conductivities (lowest resistivities) were observed in portions o f soils where LNAPL was in residual and free phase. Corroborating evidence from bacteria enumeration from soil close to the vertical resistivity probe (VRP) installations show orders-of-magnitude increase in both heterotrophic and oil degrading microbes at the depths where the conductivity was at a maximum. The coincidence o …

Inbreeding, Male Diploidy, And Complementary Sex Determination In The Solitary Wasp Euodynerus Foraminatus, Julie Kozaczka Stahlhut

Dissertations

In the insect order Hymenoptera, which includes wasps, bees, and ants, females normally develop from fertilized eggs and are diploid, while males develop from unfertilized eggs and are haploid. Underlying mechanisms of sex determination are more complex and vary among different hymenopteran taxa. One such method is single-locus complementary sex determination, or sl-CSD, in which sex is determined by a single gene locus with many alleles. In species with sl-CSD, diploid individuals that are heterozygous at the sex locus develop as normal females and hemizygous (haploid) individuals as normal males, but diploids homozygous at the sex locus will also develop …

Three Essays On Economic Reform: Effects On Human Development, Fertility, And Factor Shares, Khaled Ibrahim Abdel-Kader

Dissertations

This dissertation contains three essays on economic reform programs supported by the IMF and World Bank. Using appropriate theoretical and empirical models, we investigate the impact of reform on three aspects of economic development: (1) human development, (2) fertility, and (3) income shares of factors of production. In the first essay, we examine the long-run impact of reform on different measures o f human development and income. Empirical results show that reform has long-run positive impact on GDP per capita and measures of human development. However, worse initial macroeconomic conditions offset this impact. In the second essay, we examine the …