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Fracture Mechanics Of High Strength Concrete Members, Rajendra K. Navalurkar

Dissertations

This study investigates the behavior of High Strength Concrete (HSC) under uniaxial state of stresses. Emphasis is placed on experimental evaluation of important mechanical and fracture properties. Owing to high brittleness of HSC, experimental results especially on tensile behavior have been largely limited and scarce. In this research, direct uniaxial tension tests are employed for determination of the post-peak tensile softening characteristics of HSC. The softening characteristics of high strength concrete is found to be considerably different than that of normal strength concrete (NSC). Fracture energies evaluated form the descending branch of the stress softening reveal significant drop in the …

Vapor-Liquid Phase Equilibria Of Nonideal Fluids With A Ge-Eos Model, Socrates Ioannidis

Dissertations

This study dealt with the prediction and correlation of vapor-liquid equilibria behavior of nonideal fluids. The thermodynamic formalism of the G^E-EoS models, which combines the two traditional methods γ-Φ and Φ-Φ used so far for low and high pressure phase equilibria correlations respectively, has been combined with the 1FG^E model, based on one-fluid theory, to produce a more consistent approach to the phase equilibrium problem.

In the first part of our study we examine the predictive abilities of our model for vapor-liquid equilibria of highly nonideal fluids. The results establish the fact that the Huron-Vidal mixing rule …

Motion Estimation And Video Coding, Xiaochun Xia

Dissertations

Over the last ten years. research on the analysis of visual motion has come to play a key role in the fields of data compression for visual communication as well as computer vision. Enormous efforts have been made on the design of various motion estimation algorithms.

One of the fundamental tasks in motion estimation is the accurate measurement of 2-D dense motion fields. For this purpose. we devise and present in this dissertation a multiattribute feedback computational framework. In this framework for each pixel in an image. instead of a single image intensity. multiple image attributes are computed as conservation …

Reductive Dehalogenation Of Chlorinated Aromatic And Aliphatic Hydrocarbons Under Anaerobic Conditions, Monica Turner Togna

Dissertations

The process of reductive dehalogenation involves the removal of a halogen substituent from a molecule with the concurrent addition of electrons to the molecule, resulting in a more reduced and often less toxic product. Anaerobic bacteria have the potential to utilize hazardous chlorinated aromatic and aliphatic hydrocarbons as electron acceptors in metabolic reductive dehalogenation processes.

In experiments performed with chlorinated aromatic compounds a highly enriched anaerobic culture stoichiometrically converted 2,4,6-trichlorophenol (2,4,6-TCP) to 4-monochlorophenol. Dehalogenation occurred only in alkaline media (pH 8-9) at concentrations of 2,4,6-TCP up to 1 mM. Data indicated that the dehalogenating organism did not fit into any …

Scaling Up Of Water-Based Organic Reactions, Chen Gu

Dissertations

Three water-based organic reactions, Diels-Alder, epoxidation of olefins, and free-radical bromination have been investigated as an approach to pollution prevention. The first two systems were scaled-up by at least a factor of 20. These reactions are of special interest to the pharmaceutical and speciality chemical industries. The photo-induced free-radical bromination of alkanes with bromine in water was studied in a two-phase system. Experimental results show that all reactions have advantages resulting from being conducted in water, such as reaction rate acceleration, reaction selectivity increase, and the absorption of water-soluble gas byproduct by solvent water.

The effects of stirring rates, temperature, …

Effect Of Vitamin Supplementation On Biodegradation Of Aliphatic Hydrocarbons And Diesel Fuel, Susmita Guptapal

Dissertations

Bioremediation of hazardous wastes is proven to be environmentally benign and most cost effective technology when proper conditions are provided. However, commercialization of this method still requires comprehensive research to enhance the degradation rate to make the technology more acceptable for implementation. In this research a unique approach to increase the rate of biodegradation by vitamins supplementation was studied.

Five vitamins, niacin, biotin, folic acid, thiamin and pantothenic acid were selected for the present study. Different short chain (C₈ and C₉), and long chain (C₁₆ and C₁₇) aliphatic hydrocarbons and diesel fuel (a mixture …

Scheduling And Discrete Event Control Of Flexible Manufacturing Systems Based On Petri Nets, Huanxin Henry Xiong

Dissertations

A flexible manufacturing system (FMS) is a computerized production system that can simultaneously manufacture multiple types of products using various resources such as robots and multi-purpose machines. The central problems associated with design of flexible manufacturing systems are related to process planning, scheduling, coordination control, and monitoring. Many methods exist for scheduling and control of flexible manufacturing systems, although very few methods have addressed the complexity of whole FMS operations. This thesis presents a Petri net based method for deadlock-free scheduling and discrete event control of flexible manufacturing systems. A significant advantage of Petri net based methods is their powerful …

Study Of Stress In Microelectronic Materials By Photoelasticity, Hancheng Liang

Dissertations

The study of stress is playing an important role in microelectronic technology. In comparison with other techniques, the photoelasticity technique has the advantages of having high spatial resolution and high sensitivity. It can be used in qualitative observation in real-time and quantitative determination of stress distribution in the microelectronic materials and devices.

This dissertation presents a systematic study of photoelastic stress analysis in microelectronic materials and devices, ranged from theoretical study to practical system setup, from measurement methods to their applications. At first, based on the detailed survey on the piezo-optic properties of the crystals used in microelectronics, we apply …

Reaction Kinetics Of Methanol And Mtbe Oxidation And Pyrolysis, Wen-Chiun Ing

Dissertations

This study presents experimental data on the decomposition of methanol in several different reaction environments - fuel lean to stoichiometric at a temperature range of 873 and 1073 K and a pressure range of I and 5 atm. Methane fuel is also added in several of the systems studied in order to provide experimental data to understand the methanol addition effect on the methane oxidation.

Computer codes: ThermCal, ThermSrt and ThermCvt have been developed for the thermal property calculations of stable molecules by the Benson group additivity method and of radicals by the NJIT hydrogen bond increment method.

Pressure dependent …

Leader Attitudes And Leader Stress: Is There A Connection?, Earl B. Kaurala

Dissertations

In an era of technological innovation, information explosion, and state and national calls for educational reform, it seems important to adopt processes that will allow for rapid diffusion of knowledge and implementation of new technologies into classrooms. The leadership provided by the principal is extremely important to this process. Unfortunately, principals can be overwhelmed by the conflicting expectations that have become associated with their role within the educational community.

The purpose of this study was to investigate the leadership attitudes of Michigan secondary school principals and the relationship of these attitudes to the work-related stress the surveyed principals indicated they …

Behavior And Attitudes Related To The Prevention Of Sexually Transmitted Disease And Unplanned Pregnancy, J. Lee Hoover

Dissertations

A sample of 214 persons was tested to determine the impact of gender role orientation, neuroticism, extraversion, authoritarianism, race, gender, and sexual orientation on attitudes and behavior relevant to the prevention of sexually transmitted disease and unintended pregnancy. Specifically measured was the impact of these factors on attitudes toward the condom as contraceptive, attitudes toward the condom as prophylactic, and reported condom use.

Gender role orientation was measured using the short form of the Bern Sex Role Inventory (BSRI) (Bern, 1978), neuroticism and extraversion were measured using the NEO-Five Factor Inventory (NEO-FFI) (Costa & McCrae, 1992), and authoritarianism was measured …

Eye Movement Desensitization And Reprocessing Treatment Of Communication Anxiety: A Closer Look, Teresa Foley

Dissertations

The purpose of this study was to replicate the results of previous research with respect to EMD/R (eye movement desensitization and reprocessing) and of this researcher’s investigation of EMD/R treatment of public-speaking anxiety (Foley & Spates, 1995). The present study, however, included components to permit more extensive analysis of the elements of treatment that contribute to therapeutic effectiveness. The study investigated the contribution of assessment speeches to treatment effectiveness by using a two factor design in which one factor featured a condition of pre-treatment/post-treatment speeches vs. a condition of post-treatment speeches only. The other factor featured two treatment conditions, permitting …

A Qualitative Exploration Of Women Survivors’ Disclosure Of Childhood Sexual Abuse, Joanne Dodgson

Dissertations

In clinical literature regarding adult survivors of childhood sexual abuse, disclosure of abuse is considered a vital aspect of healing (Courtois,1988; Herman, 1992). Despite the apparent significance of disclosure, few studies have been conducted to investigate this process. Integrating feminist and qualitative research perspectives, I sought to explore disclosure through the stories, language, and perspectives of women survivors. I was interested in learning about the following issues: (a) the ways in which survivors' disclosure unfolded, (b) the ways in which survivors understood and made meaning of their disclosures, and (c) the ways in which survivors' lives changed through the process …

Training Nonconventional Autoclitic And Tact Relationships In Children, Ingolfur Bergsteinsson

Dissertations

To some extent, one understands a complex aspect of human language if one can produce that kind of language in children who have not already acquired it. Skinner’s (1957) concept of autoclitic secondary verbal behavior is the most complex of his various verbal units, and until recently has not been the subject of experimental analysis. Howard and Rice (1988) made the first attempt to generate an autoclitic repertoire in preschool children, and the present study is an attempt to corroborate and extend their findings. They worked with the autoclitic “like” which identifies the accompanying primary verbal behavior as a form …

A Comparison Of The Spontaneous Utterances Of Students With Autism Across Two Educational Settings, Mary E. Peterson

Dissertations

Students with autism are being mainstreamed into general education classes in increasing numbers. This practice is based on the largely theoretical assumptions that normal peers will provide models of appropriate communication skills as well as increased opportunities for social interaction. However, there are few empirical studies available to corroborate these beliefs.

The purpose of this study was to compare the functional communication of the same group of students with autism across two settings, their general education classrooms and their self-contained, special education classrooms. Each of the students spent time in both settings during each school day. Their spontaneous language was …

The Effects Of Wraparound Services On The Adjustment Of Four Severely Emotionally Disturbed Youth: A Controlled Multiple Baseline Study, Michael J. Myaard

Dissertations

This naturalistic study employed a controlled multiple baseline design (Baer, Wolf & Risley, 1968; Poling, 1995) across subjects and behaviors to examine the effects of wraparound services on the adjustment of four Severely Emotionally Disturbed teenagers at risk o f long term residential placement. Subjects were selected on a clinical trials basis upon referral into a public sector interagency service system within a small rural county. The Vermont System For Tracking Client Progress served as the primary dependent measure and was sampled daily for one year, the Child and Adolescent Functional Assessment Scale and detailed financial data were also sampled. …

Cost Sharing Under Complex Federalism: Welfare Reform Cost Neutrality Calculations, Robert G. Lovell

Dissertations

The American system of welfare for families with children is a partnership between the federal and state governments. Under this partnership, the federal government establishes the basic eligibility policies for the Aid to Families with Dependent Children (AFDC) program, the principal program providing cash assistance to poor families. States determine payment levels and administrative policies. Costs are shared through a formula reflecting each state’s ability to pay.

To encourage policy experimentation by the states, a section of the act creating the AFDC program allows the Secretary of the Department of Health and Human Services to waive some provisions. This became …

Intergovernmental Cooperation In Metropolitan Grand Rapids, Michigan, James M. Kadlecek

Dissertations

This case study contributes to the understanding of governance in Metropolitan areas of the U.S. by examining cooperative activity among local units of government in the Grand Rapids, Michigan metropolitan area. A conceptual framework identifies the factors which impact cooperation, and displays a theoretical continuum of approaches to metropolitan governance.

The research methodology is qualitative and includes four years of participant observation, extensive records analysis, a survey of local government managers and 21 interviews with key informants.

The findings identify 151 examples of formal and informal cooperation occurring in Grand Rapids metro, as well as eight categories of factors which …

Culture-Specific Hiv/Std Prevention Programming For Lesbian And Bisexual Women, Kathleen M. Morrow

Dissertations

HIV/AIDS prevention research continues to target populations in which AIDS is already responsible for a significant number of deaths. Since an AIDS diagnosis often indicates the transmission of HIV several years earlier, targeting groups currently manifesting AIDS neglects those groups which may be at risk for transmission of HIV today. Among the lowest incidence in known cases of AIDS are women who have sex with women. Despite a preponderance of biomedical research which implicates vaginal secretions and blood products as vehicles in HIV transmission, there remains only a minimal effort to educate these w om en regarding their risk of …

Elementary Teachers’ And Principals’ Perceptions Of Principal Leadership Style And School Social Organization, Thomas Jack Evans

Dissertations

The context of teaching has dramatically changed over the last several decades following two national waves of educational reform. Researchers have focused attention on the social restructuring of schools (Liebermann, 1992) and appropriate leadership strategies, such as transformational leadership (Leithwood, 1993; Sergiovanni, 1990), for achieving comprehensive changes leading toward increased school effectiveness. Leadership that can stimulate "bottom-up" participation from teachers and principals in efforts to restructure schools has been recommended (Rowan, 1990; Sergiovanni, 1994). Therefore, the purpose of this study was to examine the relationship between elementary principals’ use of transformational leadership strategies as determined by teacher reports and the …

Children With Hiv: How They Feel About What Parents Say, Susan Pease Instone Dnsc, Msn, Cpnp

Dissertations

With improvements in diagnosis and care, children with HIV infection are living long enough to reach school age, a stage when they are capable of perceiving the stigmatizing, life-threatening nature of their illness. Many parents desire to protect them from this knowledge by avoiding an open dialogue about their disease, even though pediatric professionals advocate disclosure. Research-based guidelines about the risks and benefits of telling, however, have not been available in the literature. Using an innovative, qualitative approach through the use of grounded theory and projective drawing techniques, this investigation sought to explore what parents said about the illness and …

An Analysis Of The Auditory-Verbal And Visual-Figural Learning And Memory Patterns Of College Students With Learning Disabilities, Robert K. Eckert

Dissertations

The validity of the California Verbal Learning Test (CVLT) has been established with most clinical neuropsychological populations; however, no published work in the area of CVLT performance in adults with learning disabilities (LD) exists, despite the authors' assertion that the test is a useful psychometric measure for this population (Delis, Kramer, Kaplan, & Ober, 1987). Likewise, the validity of a recently restandardized test of visual-figural learning, the Rey Visual Design Learning Test (RVDLT; Spreen & Strauss, 1991), has yet to be investigated in LD populations. Motor deficiencies have been associated with LD in children, but little evidence exists to extend …

Implementation Of An "Early Return To Duty" Policy Within The Michigan Civil Service: An Exploratory Study, James Patrick Hurren

Dissertations

In an effort to control rising Worker's Compensation costs and accommodate disabled employees, the State of Michigan initiated an "Early Return to Duty" policy which encourages injured workers to return to work prior to being fully recuperated. During the recovery period, injured workers are assigned restricted duties consistent with their medical limitation.

Despite legislative and administrative mandates, the Early Return policy has not been fully implemented by all departments within Michigan Civil Service. The lack of uniform acceptance and application of the policy presents serious complications for managing resources effectively and has a direct bearing on achieving expected policy outcomes. …

The Status Of Middle Level Schools In Berrien County, Michigan Following Michigan Public Act 25, Judith A. Burns

Dissertations

Michigan Public Act 25 of 1990 mandated public school reform. One of 4 components of Public Act 25 is the development of a 3 to 5 year School Improvement Plan (SIP). The purpose of this descriptive study was to examine middle level school improvement in Berrien County, Michigan, for evidence that developmentally appropriate middle level education is promoted.

This 2-part investigation involved analyzing SIPs submitted for 1992-93 school year using a content analysis format and interviews with each building principal or designee. The content analysis format was developed by Sweeney and Cooper in 1992 to analyze SIPs of Wayne County, …

An Assessment Of The Characteristics Of Catholic School Boards In The State Of Michigan, Frank C. Wippel

Dissertations

This study describes the nature and development of Catholic school boards, reports the characteristics of Michigan Catholic school boards, and investigates relationships between involvement in key board functions (establishing mission, long-range planning, budget monitoring, policy development, and marketing) and selection processes, governance postures, and training. The findings indicate a relationship between key board function involvement, election process, consultative governance posture, and training. Survey methodology and design was used to obtain the data for the study. Board presidents and school administrators from all 358 Catholic schools in the state were invited to participate. A 9 6 % response rate was obtained. …

Teaching/ Learning Experiences: Meanings Constructed By Participants Ini A Degree Completion Program For Adult Students, Natalie K. Manbeck

Dissertations

The purpose of this study was to explore the meaning that teachers and their adult students construct of their classroom experiences and to see how those meanings impact the teaching/ learning process. Because of the multiple factors affecting an educational experience, this study took the view that this should be explored in a holistic way. Most educational research focuses on the teacher's perspective, with students and their learning considered as the result of the educational process. In order to more fully understand what is occurring in classrooms and what students are actually learning, it is important to ascertain student perceptions …

Experimental And Analytical Investigation Of Waterjet Cleaning Process, Ping Meng

Dissertations

This doctoral dissertation is concerned with the development of water based cleaning technology required by industry which may substitute the traditional approach based upon the use of various chemical cleansers.

The experimental study involves the waterjet removal of various coatings (rust, oil and epoxy based paints, etc.). Cleaning was carried out under a wide range of operational and geometrical conditions (standoff distance, travel speed, water pressure, diameters of sapphire nozzle and focusing tube, nozzle body type). A new designed spiral nozzle body was tested in this work. The use of surfactant was also investigated. Microscope and SEM surface were used …

Characterization And Fabrication Of A (6h)-Sic As A Piezoresistive Pressure Sensor For High Temperature Applications, Robert Sylvester Okojie

Dissertations

A prototype monolithic 6H-SiC pressure sensor operational up to 350°C, with potential to operate up to 600°C, was batch fabricated and tested. At temperatures higher than 450°C, silicon diaphragms creep under minimal load. To operate beyond 450°C, therefore, the use of 6H-SiC was proposed. However, three key technological issues - fabrication, high temperature metallization, and gage factor characterization - had to be resolved. Since conventional fabrication technology is not applicable to SiC due to its near inert chemistry, photoconductive selectivity techniques to etch the piezoresistors were developed. Techniques to wet etch the cavities in a dark current mode were developed, …

Experimental And Numerical Investigation Of Abrasive Waterjet Polishing Technology, Fenggang Li

Dissertations

The objective of this investigation is the development of the abrasive waterjet (AWJ) based polishing technology. The result of the investigation will assist the implementation of AWJ polishing for manufacturing processes and procedures.

Experimental exploration of AWl polishing involving processing of difficultmachine materials such as Alumina ceramic and stainless steel. Surface improvement due to this processing is evaluated by measuring the roughness of the generated surfaces and examining the microhardness and micro-topography of the surfaces using Scanning Electronic Microscopy (SEM). The surface roughness of 0.3 micron was obtained at samples of ceramic and metal alloys at a reasonable rate using …

The Constant Fracture Angle Model For Cementitious Materials, Suk Ki Kim

Dissertations

Fracture mechanics of concrete has been investigated for the past two decades using linear elastic and nonlinear fracture mechanics concepts. The models proposed so far remain questionable largely due to specimen dependency of the proposed fracture parameters.

In this study, a new approach for modeling the fracture characteristics of concrete and fiber reinforced concrete is proposed. The model depends on the load CMOD relationship rather than the traditional load-deflection principle. Although energy consumed during fracture is definitely a direct function of the load displacement response, it was observed that traditional displacement measurement included an extraneous and erratic portion due to …