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African-American Women’S Emotional Responses To Historical Racial Events As A Function Of Socioeconomic Status, Melissa Ruth Stevenson

Dissertations

One hundred African-American women between the ages o f 18 years and 80 years who were born in the United States and for whom English was their primary language were exposed to video taped incidents o f historically accurate racist events from American history. Measures of emotional reactivity including heart rate, blood pressure and measures o f anger and anxiety were taken and the Hollingshead Four Factor Index o f Social Status was used to classify subjects into three socioeconomic levels. The experimental protocol required that subjects be exposed to a period of adaptation followed by a period of exposure …

A Comparison Of Methods For Detection Of Qualitative Interaction In Multicenter Trials, Boyd Jay Hanson

Dissertations

This research evaluated and compared three methods for the detection of qualitative treatment-by-center interaction proposed by Azzalini and Cox, Gail and Simon and Ciminera et al., through the analysis of simulated data for multicenter studies of two and three centers with two treatments. The effect of unequal sample size and the presence of an overall treatment effect on characteristics of the methods were examined.

The approach, underlying assumptions and theory of the three methods differ. For this study, they were adapted to establish a common basis for evaluation, thus allowing a meaningful comparison of the methods. For the test presented …

Promoting Healthy Behavior Change In Skin Cancer Risk Reduction Using The Transtheoretical Stages Of Change Model, Sherry L. Pagoto

Dissertations

Skin cancer is the most commonly diagnosed cancer in the United States with 20% of people developing some form of skin cancer in their lifetime (American Cancer Society, 1999). In spite of the high incidence of skin cancer, it is highly preventable. Approximately 90% of the cases are caused by exposure to ultraviolet radiation from the sun (Skin Cancer Foundation, 1992). The effect of an intervention aimed at reducing skin cancer risk was compared to a survey only control group in 99 Chicago beach-goers. The intervention was based on the Transtheoretical Stages of Change Model (TTM) and included sun sensitivity …

The Influence Of Race On Ethical Decision-Making Regarding Nonsexual Dual Relationships, Beatrice Antly Tatem

Dissertations

Ethical decision-making is a crucial part of the daily practice of psychologists. Psychologists are faced with the challenge of developing ethical decision-making strategies that effectively address the dilemmas associated with dual relationships. Nonsexual dual relationship is defined in this research as a clinical professional relationship that occurs simultaneously with a nonsexual professional and/or personal relationship. Psychologists, regardless of the environment in which they work or the client population with whom they work, can experience a nonsexual dual relationship.

The current study investigated whether ethnographic therapist characteristics influence the interpretation and application of the APA Ethical Guidelines and thus psychologists’ decision-making …

The Grandparent-Raising-Grandchildren Phenomenon In Michigan, Linda Gail Kimball

Dissertations

Role theory, specifically the incongruous and time-disordered role fit confronted by grandparent caregivers, provides the theoretical basis for this inductive qualitative research study.

A cohort of thirty-five grandparent caregivers, predominantly White, middle-income, older and married, participated in this study. Also included were seven leaders of support groups for grandparents responsible for raising their grandchildren.

Instrumentation included 23 questions to elicit demographic information from the grandparent caregiver. Additionally, the grandparents and the support group leaders responded to a set of focused questions designed to identify (a) the issues facing grandparents who are primary caregivers for their grandchildren, (b) the implications for …

Study Of Automotive Hydromount Mechanism, Min Lu

Dissertations

The hydromount mechanism is studied. It was determined that the dynamic characteristics of the hydromounts are related to the rubber static stiffness, rubber damping coefficient, volumetric stiffness, and effectiveness of the oscillating fluid in the inertia track. At high frequencies the motion of the fluid in the inertia track diminishes so that its effect is negligible and may be ignored. It is also concluded that the rubber damping has a minimal effect on the hydromount dynamic properties and may be neglected. The maximum loss angle, which corresponds to the maximum damping coefficient of the hydromount, occurs near the inertia track …

The Development And Use Of The God Representation In Women, Herdley O. Paolini

Dissertations

The purpose of this research was to identify and describe common themes present in the constructions and functions of the God representation in women. In particular, this research explored the common themes and relationships between a woman’s internal representation of God and her use of that representation in the service of creating and recreating the self.

Although God representation has received some attention in the literature, most research has focused on God representation formation, not function. In addition, much literature examining God representation has focused on psychiatric cases; very little has been studied about God representation in the general population …

Enhancing Commercial Aircraft Survivability Via Active Venting, Roger L. Veldman

Dissertations

A new technique for enhancing aircraft safety in the event of an on-board explosion was studied. The method under study employs deployable vent panels located on the fuselage which are activated by an array of pressure sensors in the aircraft interior. In the event that an explosion is detected, appropriate vent panels are rapidly released from the aircraft. This approach seeks to provide timely relief of explosive pressures within an aircraft to prevent catastrophic structural failure.

In this study, the approximate time scale of an explosive detonation and the subsequent sensing and electronic processing was determined. Then, the actuation response …

The Sense Of Nonsense: An Annotated Edition Of Ring W. Lardner’S Short Plays, Scott A. Topping

Dissertations

This edition presents twenty-one short plays by Ring W. Lardner (1885-1933), most of which have previously been accessible only on microfilm and in special collections. No edition exclusively dedicated to Lardner’s plays has ever been published. Though Lardner is known primarily for his short stories and sports writing, he considered himself to be a playwright and lyricist. Throughout his career he wrote several full-length plays (collaborating with George Cohan and George Kaufman, among others) and hundreds of short plays and sketches from which my collection is derived. Lardner’s sensitive ear for American dialects, praised by H. L. Mencken, Carl Van …

First Nations Students: What Some Teachers Do That Make Them Successful, Robert M. Peacock Edd

Dissertations

With the European settlement of North America, the education of First Nations children shifted from being carried out in a natural setting by all community members, communicated through observation and trial, and instructed through values, needs, and traditions; to a whole-group learning model founded on a standard curriculum based on successes and failures. For at least the past fifty years First Nations adults have demanded greater control over their children's education. Recently, the Ministry of Education in British Columbia (BC) has advocated for greater success of First Nations students by providing funding for additional support and by increasing the number …

An Analysis Of The Impact Of An Outlier On Correlation Coefficients Across Small Sample Data Where Rho Is Non-Zero, Maria A. Suchowski

Dissertations

This study addressed the problem o f the probable effectiveness o f the Pearson correlation coefficient (r) as an estimator o f moderate or strong population correlation (rho) when that estimate is based on small sample data which contains an outlier. In such a situation, three components contribute to the size o f a sample correlation coefficient, and so to the subsequent effectiveness o f the resulting estimation decision. These components are 1) rho, 2) sample size, and 3) outlier. Considered in this study were: two conditions o f rho (.5 and .8), three sample sizes (10, 30 and 50) …

The Effects Of Educational Development Plans Motivation To Learn, And Attitudes And Behaviors Toward Learning Among Eighth Graders, Mary Alice Schultz-Krajenta

Dissertations

Educational Development Plans (EDP) have been utilized by school students to structure their curricular programs to meet their high school educational outcomes and to align their curriculum with their desired adult roles. The focus of this study was to examine the effects of EDPs on motivation, attitudes and behaviors towards learning.

A total of 342 eighth-grade students participated in this research which utilized a quantitative and a qualitative approach. The quantitative study used existing data obtained from a small Midwest school district. There were 151 students in the treatment group and 191 students in the control group. Scores from the …

Transitioning And Adapting To College: A Case-Study Analysis Of The Experience Of University Students With Psychiatric Disabilities, Kenneth M. Werner

Dissertations

The psychiatric rehabilitation literature (Unger, 1987) indicates that few studies have been conducted about the adaptational demands associated with the transition to college for young adults with psychiatric disabilities who negotiate the university experience without the benefit o f a supported education program .

The purpose of this study was to describe how individual, social, and institutional factors contributed to the successful transition and adaptation to college life for students with psychiatric disabilities. The study sought to identify how students with psychiatric disabilities disclosed their illness in order to request support services and accommodations, and which services were essential or …

Correlates Of Life Satisfaction After Retirement, Richard A. Tackett

Dissertations

Much of the literature on aging, retirement, and stages of life has focused on men. The changing role from productive members of society to that of being retired can be either viewed as an opportunity to experience new adventures or depressing for those who are unable to move successfully into the next developmental stage of life. This study examined factors that could contribute to life satisfaction in 144 individuals who were over 65 years of age. The factors that were included in this examination are self-esteem, morale, depression, and demographic characteristics (e.g., age, gender, ethnicity, educational level, marital status, income, …

Perceptions Of International Students And University Personnel Of Cultural Adjustment Problems At Two Private Universities, John R. Jenkins Edd

Dissertations

The influx of international students studying at United States colleges and universities during the past five decades has presented many challenges related to accommodating the needs of these “special” students. In the early 1950s, fewer than 40,000 international students were enrolled within the higher education system of the U.S.; today that number has grown to more than 490,000 students. The problems confronted by these students are both numerous and complex. University personnel often address these problems by developing specific programs designed to meet the needs of the international students at their university. However, the perceptions of these problems by international …

Crossing Myriad Borders: A Dimensional Analysis Of The Migration And Health Experiences Of Indigenous Oaxacan Women, Sharon Mcguire Phd, Op, Msn, Rn-C

Dissertations

The growing feminization of the migration of ethnic indigenous women, such as Mixtecs, Zapotecs and Triquis from the southern Mexican state of Oaxaca, are altering the dynamics and configuration of traditional Mexican migration, making it especially significant for the health professions. Informed by a postcolonial ecofeminist paradigm, this bi-national grounded theory study explored the migration and health experiences of indigenous Oaxacan immigrant/migrant women. Data collection using participant observation and interviewing occurred in Oaxaca, Mexico, along the US-Mexico border, and the interior of California. Dimensional analysis was used as the method of data analysis to generate theoretical understandings of these phenomena. …

Video Indexing And Summarization Using Motion Activity, Kadir Askin Peker

Dissertations

In this dissertation, video-indexing techniques using low-level motion activity characteristics and their application to video summarization are presented. The MPEG-7 motion activity feature is defined as the subjective level of activity or motion in a video segment. First, a novel psychophysical and analytical framework for automatic measurement of motion activity in compliance with its subjective perception is developed. A psychophysically sound subjective ground truth for motion activity and a test-set of video clips is constructed for this purpose. A number of low-level, compressed domain motion vector based, known and novel descriptors are then described. It is shown that these descriptors …

Phase-Locked Loop, Delay-Locked Loop, And Linear Decorrelating Detector For Asynchronous Multirate Ds-Cdma System, Sok-Kyu Lee

Dissertations

The performance of phase synchronization and code tracking of a digital phase-locked loop (PLL) and delay-locked loop (DLL), respectively, is investigated in wideband asynchronous multirate DS-CDMA system. Dynamic Partial Correlation (DPC) method is proposed to evaluate the autocorrelation and its power spectrum density (PSD) of the cross-correlated terms in the presence of multirate multiple access interference (MMAI) under additive white gaussian noise (AWGN) and fading channel environments. The steady-state probability density function (PDF) and variance of the phase estimator error and code tracking jitter is evaluated by solving the first-order Fokker-Planck equation.

Among many linear multiuser detectors which decouple the …

Resource Allocation For Cdma Downlink To Achieve Maximum Throughput, Anil Bircan

Dissertations

Growing interest in cellular phones, wireless modems, instant messaging, pagers with the increasing use of the Internet in daily life indicate that wireless high speed Internet access and wireless multimedia applications are in great demand. The barrier to satisfy this demand is the provision of sufficiently high bit rates in severe wireless mobile channel conditions, for a multitude of services, each requiring different and perhaps even time-varying quality of services (QoS) that can be more demanding than the QoS required by today's voice service. New generation systems will enable provision of a multitude of services each with different QoS and …

Comparison Of Optical Density, Total Cell Protein, And Number Of Viable Cells (Via Fluorescent Straining) As Measures Of Microbial Growth Kinetics In Suspended And Biofilm Cultures During Biodegradation Of Naphthalene, Jeong Seop Shim

Dissertations

Most studies on bacterial growth kinetics have been dependent on theoretical modeling with general biomass measurements using either dry weight or optical density (OD), without distinguishing live from dead bacteria or debris. As a result, there remains considerable uncertainty in reliably predicting rates of biodegradation for design of treatment processes for environmental pollutants.

This research focused on measurement of bacterial growth rates and activities in suspended cultures and biofilms using Pseudomonas putida (ATCC 17484) for biodegradation of naphthalene. As expected, the rates of biodegradation differed between suspended and immobilized cultures. A comparison was made of the impact of three biomass …

Numerical Stimulation Of Stress-Induced Crystallization Of Injection Molded Semicrystalline Thermoplastics, Jianxin Guo

Dissertations

Injection molded semicrystalline plastic products exhibit variable morphology along their thickness directions. The processing conditions have a significant effect on the crystallinity distribution in the final parts. However, because of the lack of sound theoretical models for stress-induced crystallization kinetics in thermoplastics, simulations of the injection molding process of semicrystalline plastics with the consideration of stress-induced crystallization have been scarce.

A stress-induced crystallization model for semicrystalline plastics is proposed based on the theory that stress induced orientation of polymer chains increase the melting temperature of the plastics, and hence, the supercooling which is the driving force for crystallization. By assuming …

Numerical Modeling And Optimization Of Waterjet Based Surface Decontamination, Konstantin Babets

Dissertations

The mission of this study is to investigate the high-pressure waterjet based surface decontamination. Our specific objective is to develop a practical procedure for selection of process conditions at given constraints and available knowledge. This investigation is expected to improve information processing in the course of material decontamination and assist in the implementation of the waterjet decontamination technology into practice. The development of a realistic procedure for processing of a chaotic and non-accurate information constitutes the main accomplishment of this study.

The research involved acquisition of representative information about removal of brittle, elastic and viscous deposits. As a result an …

Empirical Model-Based Control For End Milling Process, Abdelmalak Salib

Dissertations

The main objective of this research is to develop an empirical model-based control mechanism to maintain a fine surface finish quality by maintaining on-line cutting force values. The proposed model has been developed to present the control model constraints, by varying the machining parameters to control the force output to be constant. To relate the surface finish and the cutting force in the end milling machining process, a design of experiment has been conducted to determine the effect of two different materials (aluminium and steel) and the machining parameters (feed rate, spindle speed) at a predefined depth of cut.

Regression …

Electro-Magnetic Control Of Cylinder Wake, Zhihua Chen

Dissertations

The objective of this dissertation is to develop open and closed-loop control algorithms for manipulating wake flows past a solid cylinder in an electrically low-conducting fluid (e.g. seawater). The intent is to avoid both vortex shedding and flow separation from the body. It is desired to reduce the mean drag significantly and prevent the lift from becoming non-zero at all times. This is achieved through the introduction of a Lorentz force in the azimuthal direction generated by an array of permanent magnets and electrodes located on the solid structure. The array of actuators offers the advantage of making the Lorentz …

Nonlinear Optical Properties Of Nano Structures, Mahesh U. Ajgaonkar

Dissertations

Nonlinear optical properties of nanoscale semiconductors had been a topic of intense research in recent years in attempts to realize all-optical communication systems. These semiconductor nanoclusters, in the range of 1-100nm are hosted in a dielectric material and are considered as a particular example of Conditional Artificial Dielectric (CAD). It has been reported that the dielectric properties of such materials will be greatly changed by light intensity.

Two main paths to realize nano semiconductor clusters are reported in this dissertation. The Pulsed Laser Deposition (PLD) technique is first described. Here we were investigating the effect of surface modification of nano …

Assessing The Economic Impact Of Aircraft Noise On Communities, Ithan B. Zimmer

Dissertations

The impact of aircraft noise on communities is complex and multi-dimensional. This matter cannot be resolved without careful analysis of a complex array of related problems and issues including the environment, the economy, and quality-of-life concerns of people living in proximity to airports or aircraft routes. The effects of community noise are widespread and varied. Impacts can include sleep and speech interference, activity interference, general annoyance, and property value decrease. In order to improve public policy and provide a foundation for additional research, it is imperative to establish the extent of a problem. Dollars are often the least common denominator …

Kinematic Synthesis Of Adjustable Spatial Four And Five-Bar Mechanisms For Finite And Multiply Separated Positions, Kevin Russell

Dissertations

Although spatial mechanisms are more general in structure than planar mechanisms, their applications are few due to the limited number of practical design tools and the complexity of those available. It is in fact the task of the future to develop effective, but practical design tools for spatial mechanisms.

This research presents several new methods for synthesizing adjustable spatial mechanisms. The first method involves the kinematic synthesis of spatial mechanisms for multiphase motion generation. Using this method, spatial four and five-bar mechanisms can be synthesized to achieve different phases of prescribed rigid body positions. The theory of this approach has …

Interference Suppression And Diversity For Cdma Systems, Xiaodong Cai

Dissertations

In code-division multiple-access (CDMA) systems, due to non-orthogonality of the spreading codes and multipath channels, the desired signal suffers interference from other users. Signal fading due to multipath propagation is another source of impairment in wireless CDMA systems, often severely impacting performance. In this dissertation, reduced-rank minimum mean square error (MMSE) receiver and reduced-rank minimum variance receiver are investigated to suppress interference; transmit diversity is applied to multicarrier CDMA (MC-CDMA) systems to combat fading; packet combing is studied to provide both interference suppression and diversity for CDMA random access systems.

The reduced-rank MMSE receiver that uses a reduced-rank estimated covariance …

Analysis And Control Of Monolithic Piezoelectric Nano-Actuator, Xuemei Sun

Dissertations

The study of the monolithic piezoelectric actuator, the dominant type of micropositioner is an attractive and challenging area, where realtime control theory and digital signal processing are effectively applied. The actuator can be applied in precision instruments and precision control, such as microscopes, medical and optics instruments because of the piezoelectric ceramic's high resolution, fast transient response, and potential low cost. However, hysteresis nonlinearity and lightly damped vibration exist in the system, which limit the actuator applications.

This work focuses on the hysteresis characteristics in time and frequency domains along with experimental and simulated results to verify the effectiveness of …

Environmental Science In The New Millennium : A Model To Give Structure And Guidance, James M. Lipuma

Dissertations

This work proposes a template for successful interdisciplinary Environmental Science (EVSQ) programs at four-year American learning institutions. The first conclusion reached is that there is no one "perfect" program. Only by identifying clear goals for EVSC can programs improve. It was determined that a clear definition of EVSC and mission statements related to these definitions are necessary first steps to allow improvement to occur. One major outcome of the work is the educational model built to understand EVSC education. The model identifies methods by which the goals and objectives of EVSC can be identified and accomplished. The research found that …