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Measurement And Prediction Of Temperature Histories For Single Coal Particles Prior To And During Devolatilization., Ramanathan Sampath Jan 1994

Measurement And Prediction Of Temperature Histories For Single Coal Particles Prior To And During Devolatilization., Ramanathan Sampath

Graduate Theses, Dissertations, and Problem Reports (ETD)

The measurement and prediction of the devolatilization temperature histories of bituminous coal particles (of size 106-125 {dollar}\\mu\\rm m){dollar} are carried out for a range of heating intensities. Single particles were isolated in an electrodynamic balance and their three-dimensional external surface areas, volumes, and densities were measured using rapid optical methods. The particles were then irradiated with a pulsed Nd:YAG laser beam of equal intensity from opposite sides. Devolatilization temperature transients during heating and cooling (after the laser pulse was terminated) were measured using a single-color pyrometer. Truncated pulse-widths were also employed to heat and cool some particles prior to devolatilization. …

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Hypermedia And The Learning-Disabled Student., Mary Janet Henry Jan 1994

Hypermedia And The Learning-Disabled Student., Mary Janet Henry

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study examined the effects of type of learner control in hypermedia software by learning disabled students. Developmental math students, not categorized as learning disabled, were also included in the study which investigated achievement, attitudes, and perceptions of those students regarding computer-based math word problem solving. Two HyperCard stacks of a tutorial nature were used as the treatment for this research. One stack contained high learner control; the other, low control. The sample included 18 learning disabled students enrolled in various math classes and 18 developmental math students enrolled in Basic Math classes in a small Western Pennsylvania college. Nine …

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Compatibility Of Submicron Silicon Cmos Circuits With Gallium Arsenide-On-Silicon Heteroepitaxy., Hormuzdiar E. Nariman Jan 1994

Compatibility Of Submicron Silicon Cmos Circuits With Gallium Arsenide-On-Silicon Heteroepitaxy., Hormuzdiar E. Nariman

Graduate Theses, Dissertations, and Problem Reports (ETD)

Advanced packaging and high density interconnections are emerging technologies as silicon MOS device dimensions scale down to minimum physical limits. Multi-chip Modules and Wafer Scale Integration improve packing density, and provide solutions to board area issues beyond the capabilities of even the most densely packed surface mount technologies. Such technologies could confront increasingly complex interconnection constraints, and might provide opportunities for the insertion of high performance optical interconnections into future microelectronic systems. However, successful integration of optics with microelectronic system technologies requires a careful evaluation of the practical issues confronting monolithic co-integration of GaAs optoelectronics with high performance silicon CMOS …

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Modeling, Simulation And Response Analysis Of Antilock Braking Systems., Sudhanshu Nigam Jan 1994

Modeling, Simulation And Response Analysis Of Antilock Braking Systems., Sudhanshu Nigam

Graduate Theses, Dissertations, and Problem Reports (ETD)

Two problems faced by the brake industries today are: (1) Longer development time because of the design approach that uses actual physical tests to evaluate and caliberat design for a specific brake and vehicle system. (2) Incapability of the ABS (Antilock Braking Systems) to optimally achieve the functional requirements of stopping distance, steerability, and stability under the wide variety of road and driving conditions that are encountered. The two problems stated above are addressed in this dissertation. A computer model is developed for brake and vehicle. Using the model analytical simulations instead of actual physical tests are performed. Simulation is …

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The Effects Of Power On Faculty Senate Involvement., Norma L. Winter Jan 1994

The Effects Of Power On Faculty Senate Involvement., Norma L. Winter

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study was designed to answer the question: are the power and influence behaviors of high school principals in West Virginia correlated with decision-making involvement of faculty senates? Data were collected in two phases. Phase 1 data resulted from surveys sent to two populations: (a) 108 respondent principals were asked to indicate their self-perceived power base utilization, and (b) 96 faculty senate chairpersons were asked to rate the decision-making involvement of their faculty senates. Phase 2 data, which was designed to confirm, amplify, or repudiate phase 1 findings, resulted from interviews and power structure analyses at three high schools representing …

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A Theoretical And Experimental Investigation Of Spouted Beds With Draft Tubes., Mao Xu Jan 1994

A Theoretical And Experimental Investigation Of Spouted Beds With Draft Tubes., Mao Xu

Graduate Theses, Dissertations, and Problem Reports (ETD)

A spouted bed with a draft tube insert and separate gas supplies into the annular region and central core at the bottom of the bed was built. The influence of the central gas feed flow rates, annular gas feed flow rate, and the bottom gap height on the solids circulation rate, gas bypassing rate through the bottom gap beneath the draft tube, and pressure drop across the bed were investigated. The experimental results show that within the experimental range: (1) an increase in the central gas feed flow rate increases the solids circulation rate and gas bypassing flow rate from …

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Attitudes And Cognitive Distortions Of Male Adolescent Sexual Offenders., Laureen Marie Aljazireh Jan 1994

Attitudes And Cognitive Distortions Of Male Adolescent Sexual Offenders., Laureen Marie Aljazireh

Graduate Theses, Dissertations, and Problem Reports (ETD)

There has been increasing awareness in the past decade of the serious nature and extent of sexual offenses committed by male adolescents. The importance of investigation in the area has been augmented by recognition that a large proportion of all sexual offenses are committed by persons under the age of 18. Extensive research is necessary to determine the variables that are related to this deviant behavior in an attempt to develop prevention and treatment techniques. Literature on adult sexual offenders and nonclinical samples suggest that attitudes held by males are factors that contribute to sexual aggression. The purpose of this …

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Long-Term Underground Mining Sequence Planning Using Dynamic Programming., Mohammad S. Al-Juhani Jan 1994

Long-Term Underground Mining Sequence Planning Using Dynamic Programming., Mohammad S. Al-Juhani

Graduate Theses, Dissertations, and Problem Reports (ETD)

One of the most important aspects in the long-term planning of an underground mine is the decision on production scheduling, (the long-term mining sequence planning); that is the order in which parts of the seam should be mined given a specified number of operating units. An optimal mining sequence of the combined operating units would lead to the best possible net present value (NPV) for a mining company. Moreover, a non-optimal mining sequence could cause undesirable cash flows in early years which could cause the economic failure of the mine. Therefore, a planning procedure coupled with dynamic programming model (DP …

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Cognitive Psychology And Hypermedia: Merging The Disciplines., David J. Ayersman Jan 1994

Cognitive Psychology And Hypermedia: Merging The Disciplines., David J. Ayersman

Graduate Theses, Dissertations, and Problem Reports (ETD)

Typically, hypermedia research has involved brief treatments while examining attitudes, perceptions, and specific content-area performances of students. There is very little research which examines preservice teachers' experiences of learning about hypermedia and cognitive theory as tools to be applied to education. This dissertation examines a variety of issues involved in learning and teaching with and about hypermedia. It consists of four separate studies that provide an in-depth view of preservice teachers' cognitive, metacognitive, supracognitive, and cogitative experiences as they completed a Hypermedia in Education course. These terms are defined in the Introduction section of the dissertation where additional information is …

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Selected Aspects Of Automation And Implications For Post-Secondary Technology Education., Mark Edward Bronakowski Jan 1994

Selected Aspects Of Automation And Implications For Post-Secondary Technology Education., Mark Edward Bronakowski

Graduate Theses, Dissertations, and Problem Reports (ETD)

The primary purposes of this study were to (1) develop a rank-ordered listing of concepts, ideas, equipment, systems, and techniques pertaining to the broad aspects of automation recommended for post-secondary technology education programs, and (2) draw implications for post-secondary education curriculum based on the outcomes of the Delphi. The study consisted of a three-round Delphi with a panel of twenty manufacturing professionals at a supervisory or higher level and with automation experience. A different and smaller group was used to develop the initial list of 35 items that the panel responded to in Round One. Panelists accepted, rejected, modified, or …

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The Effect Of Hypertension On Cognitive Performance In Older Adults: Self-Evaluation As A Mediator., Ruth Tunick Jan 1994

The Effect Of Hypertension On Cognitive Performance In Older Adults: Self-Evaluation As A Mediator., Ruth Tunick

Graduate Theses, Dissertations, and Problem Reports (ETD)

The primary purpose of the present study was to examine the effect of hypertension on both self-assessed and laboratory measures of memory and on non-cognitive factors such as anxiety, depression, self-efficacy, and locus of control. Eight male and twelve female normotensive adults aged 62 to 77 years (M = 71.8) and 8 male and 12 female hypertensive adults aged 62 to 78 years (M = 72.5) completed questionnaires measuring state and trait anxiety, depression, self-efficacy, locus of control, and health in addition to performing speed of processing, spatial and verbal working memory and short term memory tasks and measures of …

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Experimental Observation Of Ion-Cyclotron Turbulence In The Presence Of Transverse-Velocity Shear., William E. Amatucci Jan 1994

Experimental Observation Of Ion-Cyclotron Turbulence In The Presence Of Transverse-Velocity Shear., William E. Amatucci

Graduate Theses, Dissertations, and Problem Reports (ETD)

This laboratory investigation documents the influence of transverse, localized, dc electric fields (TLE) on the excitation of ion-cyclotron waves driven by magnetic-field-aligned current (FAC) in a Q-machine plasma device. A segmented disk electrode, located on axis at the end of the plasma column, is used to independently control TLE and FAC in the plasma (potassium plasma, {dollar}n\\approx 10\\sp9{dollar} cm{dollar}\\sp{lcub}-3{rcub}{dollar}, {dollar}\\rho\\sb{lcub}i{rcub}{dollar} {dollar}\\approx{dollar} 0.2 cm, {dollar}T\\sb{lcub}e{rcub} = T\\sb{lcub}i{rcub}{dollar} {dollar}\\approx{dollar} 0.2 eV). Ion-cyclotron waves have been characterized in both the weak-TLE and large-FAC regime and the strong-TLE and small-FAC regime. The existence of a new category of oscillation identified as the inhomogeneous energy-density …

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Fracture Behavior Of Notched Continuous Fiber Boron/Aluminum Metal Matrix Composite., Fu-Ken Hsieh Jan 1994

Fracture Behavior Of Notched Continuous Fiber Boron/Aluminum Metal Matrix Composite., Fu-Ken Hsieh

Graduate Theses, Dissertations, and Problem Reports (ETD)

One of the most useful attribute of reinforced fibrous composites is its ability to retard crack propagation and thereby improve its overall fracture resistance. Research on the fracture behavior of continuous fiber reinforced metal matrix composites (MMC's) is critical to assessing important engineering properties such as fatigue, impact resistance, creep and durability. The mechanism of interfacial fiber/matrix sliding and debonding in a notched fiber reinforced composite and the corresponding increasing of the overall fracture toughness have been studied in recent years. However, to the best of our knowledge, no direct in-situ experimental measurement of the interfacial sliding and debonding processes …

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A Multimodal Analysis Of Pain-Related Anxiety: Relations Between Anxiety Reports, Physiological Responses, And Avoidance During Painful And Non-Painful Movement., Lance Maxwell Mccracken Jan 1993

A Multimodal Analysis Of Pain-Related Anxiety: Relations Between Anxiety Reports, Physiological Responses, And Avoidance During Painful And Non-Painful Movement., Lance Maxwell Mccracken

Graduate Theses, Dissertations, and Problem Reports (ETD)

Persons with chronic pain often display extreme disability, distress, and other pain behaviors. It is clear that behavioral factors significantly contribute to the consequences of pain for many of these persons. The purpose of this study was to investigate relations of fearful cognitions about pain with other anxiety responses to pain including subjective reports of anxiety, physiological responses, and amount of activity during painful and nonpainful physical tasks. To show that these responses covary is to suggest that the same principles that apply to anxiety behaviors may apply equally well to the behavior of persons with chronic pain and that …

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Autoignition Of Low-Heating Value Gases In A Direct-Injected Diesel Engine., Carlos Emilio Romero Jan 1993

Autoignition Of Low-Heating Value Gases In A Direct-Injected Diesel Engine., Carlos Emilio Romero

Graduate Theses, Dissertations, and Problem Reports (ETD)

The autoignition of gaseous mixtures representative of coal-derived low-heating-value gaseous fuels in a direct injected diesel engine was investigated theoretically over pressure and temperature ranges of 10 to 50 atm and 800 to 1000 K respectively. A computer model was validated with experimental engine data operated on direct injected synthetic coal gas by Caterpillar, Inc. The computed results demonstrated the importance of the characteristic time associated with the chemical kinetics when compared to fluid dynamics mixing. High gas temperatures resulting from high compression ratios, high boost, high inlet air temperature or other ignition aids are needed to ignite these gases …

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Determinants Of Coping Behaviors In Marital Conflict Situations Across Adulthood., Liang-Jei Lee Jan 1993

Determinants Of Coping Behaviors In Marital Conflict Situations Across Adulthood., Liang-Jei Lee

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study examined some plausible factors that were expected to contribute to marital coping behaviors when married couples face marital conflict situations. Self-report measures of personality trait, marital coping behavior, appraisal of marital conflict, marital relationship, and social support were administered to a sample of 197 married community residents ranging in age from 23 to 82 years old. Avoidance, conflict, positive approach, self-blame, self-interest, and seeking social support were the specific marital coping styles examined in this study. A planned confirmatory examination of internal consistency of self-report marital coping measure (the Marital Coping Inventory) revealed that this measure was adequately …

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Paul Green, Symphonic Drama, And Popular Culture., Carolyn Craft Leech Jan 1993

Paul Green, Symphonic Drama, And Popular Culture., Carolyn Craft Leech

Graduate Theses, Dissertations, and Problem Reports (ETD)

Paul Green's symphonic dramas represent a collective memory for and a challenge to American popular culture. Green's artistic insight and dramatic innovation allowed him to applaud that culture and to inform it as he lauded past values of individual vision, courage, and hard work and urged compassionate confirmation of individual dignity. Green recorded features of mass culture, beginning with the people of his own North Carolina origin and eventually embracing the expanse of his country's geography and history. Green celebrated and defended the common man, and he created his literary works (especially his symphonic dramas) to cater to the tastes …

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Singular Systems: Structure, Algorithm, And Application., Jianming She Jan 1993

Singular Systems: Structure, Algorithm, And Application., Jianming She

Graduate Theses, Dissertations, and Problem Reports (ETD)

From engineering point of view, a complete accomplishment should be supported by rigorous mathematical analyses, feasible computational algorithms, and concrete practical applications. The research work of this dissertation is done with an attempt of trying to approach this principle and to understand some basic facts of singular systems in these three aspects. In Part I, a new complementary solution formulation is derived from both the time domain and the frequency domain for singular systems. The solution expressions of regular systems and singular systems are unified. Further, the dynamic characteristics of singular systems are studied. We discussed in detail on the …

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Policy Decision-Making In The United States Of America And The People's Republic Of China: The Development Of National Goals For Public Education., Bangyong Su Jan 1993

Policy Decision-Making In The United States Of America And The People's Republic Of China: The Development Of National Goals For Public Education., Bangyong Su

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study is involved in policy decision making in USA and PRC with respect to the development of national goals for public education, and deals with the following two perspectives: (1) Investigate the policy decision making process and the national education goals developed in USA. (2) Investigate the policy decision making process and the national education goals developed in PRC. This study adopts analytical and descriptive methodology including documentation review and observation. The researcher conducted computer searches through Education Research Information Center (ERIC), Public Affairs Information Service (PAIS) International, Dissertation Abstract International, Social Science Search, Sociological Abstract, and all the …

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An Investigation Of Within-Evaluation Markers For Detecting Malingered Memory Impairment., Grant Loren Iverson Jan 1993

An Investigation Of Within-Evaluation Markers For Detecting Malingered Memory Impairment., Grant Loren Iverson

Graduate Theses, Dissertations, and Problem Reports (ETD)

Neuropsychologists frequently are called upon to evaluate patients in a medicolegal context. An important part of these evaluations is determining whether the patient is being honest and forthright in his presentation of symptoms and in his test performance, or whether the patient is deliberately exaggerating his deficits via malingering. The purpose of this investigation was to examine the efficacy of using the Recognition Memory Test (RMT), Digit Span Test (WAIS-R), and Knox Cube Test as markers for malingered memory deficits. These tests were all designed to measure some aspect of attention and memory, not to assess non-optimal test performance. However, …

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Gender Differences In Work And Family Commitments And Their Effect On Work-Family Role Conflict Among Administrators In Higher Education., Maudie Elizabeth Karickhoff Jan 1993

Gender Differences In Work And Family Commitments And Their Effect On Work-Family Role Conflict Among Administrators In Higher Education., Maudie Elizabeth Karickhoff

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study intended to determine (1) if, among administrators in higher education, commitment to the work role, commitment to the family role, and work-family role conflict varied by gender and other demographic variables, and (2) what combination of variables best explained level of work-family role conflict in this population. A random sample, stratified by type of institution, was selected from the 4,679 department chairs in 196 public colleges and universities in the Southern Regional Education Board (SREB) member states. Questionnaires measured work commitment (Organizational Commitment, Career Commitment, Job Involvement), Family Commitment, work-family role conflict, and demographic variables. One-way analysis of …

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Mine Ventilation Network Optimization Using Nonlinear Programming Techniques., Changhong Huang Jan 1993

Mine Ventilation Network Optimization Using Nonlinear Programming Techniques., Changhong Huang

Graduate Theses, Dissertations, and Problem Reports (ETD)

Mine ventilation, though costly, has to be maintained for any underground coal mine for the sake of miners' safety and health. Higher productivity and more stringent environmental standards require greater quantities of air at the underground working faces. These conditions have brought a great increase in the costs of mining. To survive in the current state of market competition for the mining industry, more concerns have to be addressed on developing a ventilation system which is functionally effective and reliable, and yet economically efficient. Mine ventilation network optimization is one of the approaches to reach that objective. This dissertation is …

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To Determine The Importance Of Activities In Physical Education Curriculum Guides As Perceived By Professional Physical Educators In Selected School Districts In Western Pennsylvania., Richard C. Sullivan Jan 1993

To Determine The Importance Of Activities In Physical Education Curriculum Guides As Perceived By Professional Physical Educators In Selected School Districts In Western Pennsylvania., Richard C. Sullivan

Graduate Theses, Dissertations, and Problem Reports (ETD)

The primary purpose of this study was to identify the activities required for students in high school in physical education classes, and utilize current staff members to rate these activities according to their perceptions. The survey group was located in western Pennsylvania and the districts involved included urban, suburban, and rural populations. Each respondent was requested to complete a survey which included demographic information isolating gender, years of teaching experience, and earned educational degrees. Eighteen school districts received the questionnaire and each school responded by completing the survey. The total number of faculties located at each school could not be …

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The Relationship Between Self-Perceived Psychological Types Of Male And Female Community College Deans Of Instruction And Their Self-Perceived Leadership Styles., Joan Carol Henry-Lucas Jan 1993

The Relationship Between Self-Perceived Psychological Types Of Male And Female Community College Deans Of Instruction And Their Self-Perceived Leadership Styles., Joan Carol Henry-Lucas

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study was designed to examine the relationship between the self-perceived psychological types of male and female community college deans of instruction and their self-perceived leadership styles. The population consisted of 881 male (N = 667) and female (N = 204) community college deans of instruction identified by mailing labels from the American Association of Community and Junior Colleges who were serving in public institutions in the United States listed in the AACJC Membership Directory 1992. A proportional, stratified, random sample was conducted of 267 subjects--205 male deans and 62 female deans. A cover letter, demographic survey, the Leadership Behavior …

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A Follow Up Study Of High School Students With Mild Mental Retardation: Has The Transition Been Made?, Ronald Otho Wells Jan 1993

A Follow Up Study Of High School Students With Mild Mental Retardation: Has The Transition Been Made?, Ronald Otho Wells

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to determine if the transition from school programs to sustained employment was made by former mildly mentally handicapped students. The study was designed to determine what variables contributed to successful transition. These independent variables were four types of school programs, availability of work coordinators or job coaches, gender, and opportunity. Briefly, the four types of programs were (A) special classes with supervised work experience, (B) special classes and work experience not related or supervised by school personnel, (C) special classes with no work experience, and (D) special classes in grades 9 and 10. A …

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Effects Of Two Methods Of Recall Enhancement On Child And Adult Eyewitness Testimony., Catherine Martin Miller Jan 1993

Effects Of Two Methods Of Recall Enhancement On Child And Adult Eyewitness Testimony., Catherine Martin Miller

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study examined the relative effectiveness of two recall-enhancement procedures designed to increase the completeness and accuracy of eyewitness testimony, the Cognitive Interview and the use of Visual Props. Sixty-four subjects (32 college-age subjects and 32 7-10 year-olds) viewed two separate videotapes of simulated crime situations. After 48 hours, subjects were interviewed in two separate trials, first with a baseline minimal prompting procedure and second with one of the two training interviews. In both situations, accuracy was tested via free recall, cued recall (structured questionnaire), and recognition (photographic line-up) formats. Results indicate that both free and cued recall were significantly …

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A Comparison Of Cognitive Group Therapy To Life Review Group Therapy With Older Adults., Jules Cary Weiss Jan 1993

A Comparison Of Cognitive Group Therapy To Life Review Group Therapy With Older Adults., Jules Cary Weiss

Graduate Theses, Dissertations, and Problem Reports (ETD)

The study compared cognitive group therapy to life review group therapy with older adults who reside in a personal care facility. The study sought to find if there were differences in treatment gains between the two therapies based on subjects' level of depression (as noted on the Beck Depression Inventory) and life satisfaction (as cited on the Salamon-Conte Life Satisfaction in the Elderly Scale). Subjects were pre-tested, post-tested and administered a follow-up test 6 weeks after the post-test. An analysis of covariance was conducted, using the pre-test as the baseline measure (covariate). At post-test, subjects assigned to a treatment group …

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The Economics Of The Coal Company Town: Institutional Relationships, Monopsony, And Distributional Conflicts In American Coal Towns., Lawrence William Boyd Jan 1993

The Economics Of The Coal Company Town: Institutional Relationships, Monopsony, And Distributional Conflicts In American Coal Towns., Lawrence William Boyd

Graduate Theses, Dissertations, and Problem Reports (ETD)

Some of the most violent labor struggles in American history were fought by residents of coal company towns. This study investigates whether these struggles grew out of a competitive, or noncompetitive, labor market. In some areas, during the early part of the twentieth century, coal mine labor and capital were brought together through the institution of the company town. In order to capture this institutional context Stephen N. Cheung's sharecropping model was adapted to piece rate coal miners who lived in company towns. Competitive and noncompetitive models predicted: (a) despite the number of firms which operated in a market, miners …

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The Effects Of A Collaborative Intervention Program On The Academic Achievement Of Selected At-Risk Students., Benny Lee Guido Jan 1993

The Effects Of A Collaborative Intervention Program On The Academic Achievement Of Selected At-Risk Students., Benny Lee Guido

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this five-month study was to examine and determine the effects of a collaborative intervention program on the academic achievement of selected at risk students. Forty-four (44) at risk students in grades one through eight were selected to participate in this study. Criteria for selection included the following: one or more years behind age or grade-level groups in math and/or reading skill levels; one or more years behind age or grade-level groups in number of credits earned; potential to be school dropout; high rate of absenteeism; adjudicated delinquency; student parenthood; low CTBS/WV-STEP scores; poor grade point average; retention …

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Mathematical Modeling On The Role Of Thiobacillus Ferrooxidans In The Formation Of Acid Mine Drainage., Kareem Issa Batarseh Jan 1992

Mathematical Modeling On The Role Of Thiobacillus Ferrooxidans In The Formation Of Acid Mine Drainage., Kareem Issa Batarseh

Graduate Theses, Dissertations, and Problem Reports (ETD)

Experimental results are reported on the biological atmospheric oxidation of FeS{dollar}\\sb2{dollar} embedded within mine rocks in the presence of Thiobacillus ferrooxidans. Three different potentially acid-producing rock samples from different coal seams are used. The rate of FeS{dollar}\\sb2{dollar} conversion or production of acid is studied with respect to sterility and variations in temperature, and particle size. Pore size distributions as well as changes in porosity with conversion have been determined for both inoculated and sterilized samples. It is found, under the same experimental conditions, that the inoculated samples produce five times more acid than the sterilized ones. This is attributed to …

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