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Dynamic Response Of The Human Skull-Brain Complex To Impact: Points Of Maximum Stress And Pressure., Rinitha Palkamsetty Jan 1998

Dynamic Response Of The Human Skull-Brain Complex To Impact: Points Of Maximum Stress And Pressure., Rinitha Palkamsetty

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study addresses the transient dynamic response of a human skull-brain complex under impact loads. Three cross-sections; sagittal, transverse and coronal of the brain are considered to perform the transient dynamic analysis that describes the kinematics and stress wave patterns of the internal motions in the skull and brain mass. The models include cerebral spinal fluid and meningi membrane along with the skull and the viscoelastic brain tissue. The analysis is performed using the program LS-DYNA3D for the analysis of frontal, lateral and top impact. The results produced include the loci of points that carry the maximum stresses as the …

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An Object Relationship Framework And Persistence In Java., Srinivas S. Vangari Jan 1998

An Object Relationship Framework And Persistence In Java., Srinivas S. Vangari

Graduate Theses, Dissertations, and Problem Reports (ETD)

The main objective of this thesis is to provide the design and implementation of an object relationship framework in Java where objects can form relationships with other objects dynamically at runtime. Relationships among objects have long been recognized as the important semantic constructs facilitating ease of analysis & design of large complex systems. Almost all modeling techniques have notations to describe the existence of relationships among software components. But unfortunately the relationships identified in analysis stage could not be mapped to the equivalent high-level language constructs during the implementation because of lack of high level semantic support for relationships in …

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Environmental-Assisted Fracture Behavior Of Iron Aluminides Using Moire Interferometry With Digital Image Processing., Zhongrun Li Jan 1998

Environmental-Assisted Fracture Behavior Of Iron Aluminides Using Moire Interferometry With Digital Image Processing., Zhongrun Li

Graduate Theses, Dissertations, and Problem Reports (ETD)

The aim of this research is to investigate the fracture behavior of iron aluminides under various environments. Comparative crack growth tests of three iron aluminides (Fe-28Al-5Cr, at% with various additivies like Zr,C or B)were carried out under air, oxygen or water environment. Moiré interferometry was applied to obtain whole-field displacement, crack growth rate, stress intensity factor, and crack-tip strain fields. A digital image processing (DIP) procedure was developed to obtain the strain distributions. Test results showed that the presence of small amount of moisture is sufficient to cause significant embrittlement in iron aluminides. Furthermore, specimens tested in water environment have …

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Systematic Analysis Of Partings For Cast And Molded Parts., Mansoor Nainy Nejad Jan 1998

Systematic Analysis Of Partings For Cast And Molded Parts., Mansoor Nainy Nejad

Graduate Theses, Dissertations, and Problem Reports (ETD)

The problem of determination and optimization of parting direction and parting line for cast and molded parts was studied. The approaches of the Circle Map Method and Projection Method have been developed to concurrently determine the alternatives for parting directions, determine the cavities, and optimize them for different parameters in castings. These methods were developed by computer programs that graphically present and justify the optimized results for parting directions. The graphical presentation of results include displays for the Circle Map, Projection Method, object, parting line, cope, drag, core, core print, and object after coring. The Circle Map Method maps the …

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A Two-Perspective Study On The Modern Chinese Economy: Foreign Direct Investment And Regional Development., Chuanliu Ni Jan 1998

A Two-Perspective Study On The Modern Chinese Economy: Foreign Direct Investment And Regional Development., Chuanliu Ni

Graduate Theses, Dissertations, and Problem Reports (ETD)

Many research efforts have been devoted to the role of foreign direct investment (FDI) on China's economic achievement, to the general FDI distribution pattern as well as to regional economic disparities in China. The objectives of this dissertation are to address several issues in recent research, develop a model for FDI influx into China, examine major factors influencing FDI distribution in China and a separate study on China's regional economic disparities. Beginning with a literature survey on FDI study, I theoretically examine the (FDI) self-reinforcing model. I justify some of the assumptions of the FDI self-reinforcing model. I developed a …

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A Study Of Job Satisfaction Of Female Administrators In The National Education Association And Its Affiliates., Jacqueline G. Goodwin Jan 1998

A Study Of Job Satisfaction Of Female Administrators In The National Education Association And Its Affiliates., Jacqueline G. Goodwin

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to examine the relationship between age, tenure of employment, level of administrative position, educational level, and personality type and the degree of self-expressed job satisfaction among female administrators in the National Education Association (NEA) and affiliate organizations. The total population of 181 female administrators employed at the National Education Association and its affiliates were surveyed. Each participant was mailed a survey packet containing a cover letter, a demographics sheet, and two questionnaires. Personality type was determined by scores on the Myers-Briggs Type Indicator-Form G (1977). Demographic information was collected using the Survey of National …

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Acceleration Simulation Of A Vehicle With A Continuously Variable Power Split Transmission., Zhijian Lu Jan 1998

Acceleration Simulation Of A Vehicle With A Continuously Variable Power Split Transmission., Zhijian Lu

Graduate Theses, Dissertations, and Problem Reports (ETD)

A continuously variable transmission system has often been considered for automobiles. It offers the potential to allow the engine to operate at peak efficiency without disturbing the driver with discrete shifts. The application of CVTs in automobiles has been attempted for many years. This concept has been rapidly developed in the last twenty years. The shaft-to-shaft belt CVT is now the most commonly used CVT product in the automobiles. The main drawback of this kind of CVT is limited torque capacity and the modest power efficiency. This prevents the belt CVT from being used in the vehicles with large displacement …

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Equipment Specification, Process Control And Plant Simulation For A Lignin-Fueled Fluidized Bed Combuster Plant., Shane Brannon Lamp Jan 1998

Equipment Specification, Process Control And Plant Simulation For A Lignin-Fueled Fluidized Bed Combuster Plant., Shane Brannon Lamp

Graduate Theses, Dissertations, and Problem Reports (ETD)

Many states are confronted with the issue of how to dispose of the wood waste produced by timber and wood products companies. Converting the wood waste to ethanol is one way of efficiently disposing of the waste. However, the feasibility of the conversion facility is still being pursued. Studies are still being performed to investigate the feasibility of such a facility. The wood waste-to-ethanol conversion process produces a by-product known as lignin sludge. A recent study has concluded that the lignin sludge should be used as fuel to generate steam for the conversion process. The most efficient way to combust …

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A Toolbox Of Intelligent Solutions For Hydraulic Fracturing Models., Andrei Sergiu Popa Jan 1998

A Toolbox Of Intelligent Solutions For Hydraulic Fracturing Models., Andrei Sergiu Popa

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study is to develop a Front-End and an Optimization Routine that will help petroleum engineers to design optimum treatment schedules for hydraulic fracturing. This tool reduces the time engineers spend designing optimum treatment schedules by proposing a solution based on virtual intelligence. Neural networks and genetic algorithms are integrated in a software application to achieve the objective of this study. A methodology to reduce the total number of layers to four characteristic layers was developed. Using this methodology, two types of neural networks were trained. A new selection method was developed for the genetic algorithm process. …

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Development Of A Systems Approach To Planning, Design And Operations Of Intermodal Passenger Transfer Facilities To Increase The Mobility And Safety Of Older Travelers., Mohammad Anwarul Karim Jan 1998

Development Of A Systems Approach To Planning, Design And Operations Of Intermodal Passenger Transfer Facilities To Increase The Mobility And Safety Of Older Travelers., Mohammad Anwarul Karim

Graduate Theses, Dissertations, and Problem Reports (ETD)

America, as a society, is aging. Currently, 13% of the population is 65 years of age or older. This percentage is expected to rise to 21% by 2030. Since older travelers frequently suffer from one or more age-related physical and/or information handling decrements, they often have problems using intermodal passenger transfer facilities. The overall goal of this study was to develop a framework which can provide an approach to identify older traveler issues associated with intermodal passenger transfer facilities and serve to guide planning and engineering improvements to intermodal passenger transfer facilities to increase the safety and mobility of older …

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Family History Study Units In Secondary School: Their Educational Impact., William Foster Hayes Jan 1998

Family History Study Units In Secondary School: Their Educational Impact., William Foster Hayes

Graduate Theses, Dissertations, and Problem Reports (ETD)

This research purports to answer the question "What results may be derived from a classroom study of family history?" From a review of literature by four score teachers, administrators, and curriculum theorists, Hayes has elicited claims of 65 specific results in eight different categories. The quoted authors perceived that the classroom study of genealogy and family history: (1) Affects in positive ways how students feel about non-family history; (2) Promotes the learning of several disciplines related to history; (3) Reveals the interconnectedness of human society, and encourages multiracial and multicultural understanding; (4) Improves scholastic skills; (5) Builds students' sense of …

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Emotional Hijacking Versus Safe Behavior., Christopher Monteressi Jan 1998

Emotional Hijacking Versus Safe Behavior., Christopher Monteressi

Graduate Theses, Dissertations, and Problem Reports (ETD)

This research investigated the types of reasoning used by coal mine employees when exposed to potentially dangerous situations. Information was gathered through interviews of coal miners who related actual experiences in the coal mines. The information in the interviews and in the review of the literature was used to develop and implement an experiential program that promoted an individual's responsibility for their safety and the safety of co-workers. The experiential program addressed safe work behaviors from the perspectives of emotional and cognitive memories and the functions of the human brain. This program had three overall objectives of assisting miners to …

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A Study Of The Relationship Between Tenure And Non-Tenure Track Faculty Of West Virginia University Extension And Public Service Unit And Job Satisfaction., Patrick Irving Nestor Jan 1998

A Study Of The Relationship Between Tenure And Non-Tenure Track Faculty Of West Virginia University Extension And Public Service Unit And Job Satisfaction., Patrick Irving Nestor

Graduate Theses, Dissertations, and Problem Reports (ETD)

Extension and Public Service has completed ten years in the tenure system at West Virginia University. During the ten year time span, problems associated with the tenure system have occurred. Tenure status of Extension faculty and their job satisfaction have been an important problem for supervisors as well as faculty members. The purpose of this study was to examine the relationship between tenure status, selected demographic characteristics of faculty and their job satisfaction. Procedure. The respondents for the study were all Extension faculty in the tenure and non-tenure status at West Virginia University. The data were collected by means of …

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Immunotoxic Effects Of Pulmonary Exposure To Isobutyl Nitrite In The Murine Macrophage., Avijit Roy Jan 1998

Immunotoxic Effects Of Pulmonary Exposure To Isobutyl Nitrite In The Murine Macrophage., Avijit Roy

Graduate Theses, Dissertations, and Problem Reports (ETD)

Isobutyl nitrite (IBN) is a volatile compound that causes vasodilation and smooth muscle relaxation. A history of abuse of this compound by HIV positive homosexual men has been associated with an increased incidence of Kaposi's Sarcoma, a tumor whose growth is responsive to cytokines. Previous work with the murine pulmonary model has demonstrated that exposure to IBN can suppress cytotoxic T cell ability, reduce the production of nitric oxide by macrophages and impair their ability to kill P815 targets. The overall aim of this project was to further characterize the nature of the immune alteration in the murine macrophages. In …

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Foundations Of Object-Based Specification Design, David March Fleming Dec 1997

Foundations Of Object-Based Specification Design, David March Fleming

Graduate Theses, Dissertations, and Problem Reports (ETD)

To enhance applicability and encourage its use, a component or a component-based system must have a well-designed set of interface features as well as a proper explanation of these features. The dual problem of designing a suitable set of interface features in addition to properly explaining its behavior is termed the specification design problem. This dissertation identifies observability, controllability, and a performance-motivated pragmatic criterion as essential properties of desirable formal specifications for reusable object-based software components. The pragmatic criterion guides the design of component interfaces and component libraries to a suitable set of features so that they are widely applicable, …

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A Parametric Study Of Knock Control Strategies For A Bi-Fuel Engine., William Scott Wayne Jan 1997

A Parametric Study Of Knock Control Strategies For A Bi-Fuel Engine., William Scott Wayne

Graduate Theses, Dissertations, and Problem Reports (ETD)

A numerical thermodynamic model was developed and employed to investigate the use of elevated compression ratios, variable valve timing, and ignition timing modulation as a means of controlling knock and improving the performance of a bi-fuel engine. The proposed strategy employed an increased compression ratio to boost power and torque when operating on natural gas. An increased intake duration and retarded ignition timing were then employed to control knock during gasoline operation. Dynamometer testing was performed on a 1.9 liter Saturn{dollar}\\sp\\circler{dollar} engine to provide empirical data for model calibration and to evaluate the effects of proposed changes on engine emissions. …

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Robust Design Optimization With Applications To Composite-Material Structures., Satheesh Makkapati Jan 1997

Robust Design Optimization With Applications To Composite-Material Structures., Satheesh Makkapati

Graduate Theses, Dissertations, and Problem Reports (ETD)

The problem of robust design and optimization for designs with varying operating conditions is considered in this work. A robust design optimization tool (RDOT) has been developed in this work. The tool is constructed with building blocks: an Artificial Neural Network, a Response Evaluator (e.g., FEA, etc.), an Optimizer based on Quadratic Programming, Cooperative Game Theory, Design of Experiments, and Taguchi Methods. The tool is fully codified into a computer program, and it demands very little designer insight into the problem under consideration. Design optimization is necessary to efficiently accomplish a design that, while satisfying the desired functionality, also uses …

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Comparison Of A Pin Cam And An Inverted Pin Cam Design Based On The Parameters Used For The Axial Vane Rotary Engine (Beta Version)., Phillip Howard Burnside Jan 1997

Comparison Of A Pin Cam And An Inverted Pin Cam Design Based On The Parameters Used For The Axial Vane Rotary Engine (Beta Version)., Phillip Howard Burnside

Graduate Theses, Dissertations, and Problem Reports (ETD)

The comparison of two design variations of the Axial Vane Rotary Engine (AVRE) was done by evaluating several parameters. These two designs are called the Pin Cam and the Inverted Pin Cam designs. The first step involved developing a technique to determine the heat loads on the components of the engines since the engine is running at a steady state loading condition. The second step used this thermal data to get a final temperature profile. The third step combined the thermal data and the combustion data to perform a structural analysis of the engine components. This illustrated both the stresses …

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The Relationship Between Brain Hemispheric Characteristics And Leadership Style Of School Superintendents In West Virginia., Theodora Sinicrope Farmer Jan 1997

The Relationship Between Brain Hemispheric Characteristics And Leadership Style Of School Superintendents In West Virginia., Theodora Sinicrope Farmer

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study was designed to examine the relationship between the self-perceived preferred brain hemispheric processing of West Virginia public school superintendents and their self-perceived leadership styles. Respondents completed the Hermann Brain Dominance Profile, the Leader Behavior Description Questionnaire, and a demographic sheet. Data were analyzed using the General Linear Model of the Statistical Analysis System (SAS). Two hypotheses guided the study. West Virginia public school superintendents who perceive themselves as preferring predominantly left hemispheric processing will have significantly higher Initiating Structure scores than superintendents who perceive themselves as predominantly right hemispheric. West Virginia public school superintendents who perceive themselves as …

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Challenges Facing Colleges And Schools Of Pharmacy Over The Next Ten Years: A Survey Of The Deans., Jerald Wayne Fisher Jan 1997

Challenges Facing Colleges And Schools Of Pharmacy Over The Next Ten Years: A Survey Of The Deans., Jerald Wayne Fisher

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to determine what pharmacy deans believed to be the major internal and external challenges facing schools of pharmacy over the next ten years. The instrument for data collection was a descriptive opinion survey, consisting of two questions, that was sent to all U.S. school of pharmacy deans (n = 79). The deans were asked to provide what they believed to be the five major internal and external challenges facing their schools, and to provide two strategies for hastening the desirable or delaying the undesirable effects of each challenge. A response rate of sixty-percent (47 …

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The Use Of Simplified English To Improve Task Comprehension For Non-Native English Speaking Aviation Maintenance Technician Students., Douglas Eckert Jan 1997

The Use Of Simplified English To Improve Task Comprehension For Non-Native English Speaking Aviation Maintenance Technician Students., Douglas Eckert

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objective of this research was to determine if the use of Simplified English (SE) improved task comprehension of non-native English speaking aviation maintenance technician students in a non-English speaking environment. A background questionnaire, one test, and four controlled language instruments were administered to each subject. The test, Accuracy Level Test (ALT) by Ronald P. Carver, measured the Spanish subjects English reading ability by grade level. The four instruments were aviation maintenance task cards and tests developed by Boeing Aircraft which measured subject comprehension of maintenance procedures. The participants were 148 Mexican aviation maintenance technician students, mechanics, and instructors from …

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An Experimental And Numerical Study Of Residence Time And Mixing Characteristics Of A Full Flow Dilution Tunnel., Sunil Katragadda Jan 1997

An Experimental And Numerical Study Of Residence Time And Mixing Characteristics Of A Full Flow Dilution Tunnel., Sunil Katragadda

Graduate Theses, Dissertations, and Problem Reports (ETD)

A stimulus-response technique was applied to a co-current flow with mixing orifice type full-flow dilution tunnel to determine its fluid residence time distribution and mixing characteristics. The technique involved the injection of a tracer at the inlet and the observation of the corresponding response at the sampling zone of the tunnel. Both propane gas and corn oil aerosol of approximately 0.5 {dollar}\\mu{dollar}m in diameter were used as the non-reacting tracers for the newly developed gas injection detection system (GIDS) and aerosol injection detection system (AIDS). Data were gathered from the tunnel operated under steady-state conditions and at three different volumetric …

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Recruiting Retirees For Economic Development: A Public Policy Perspective., Michele Louise Kreidler Jan 1997

Recruiting Retirees For Economic Development: A Public Policy Perspective., Michele Louise Kreidler

Graduate Theses, Dissertations, and Problem Reports (ETD)

This paper examines retiree recruitment as a strategy in state economic development policy. The study employs a theoretical framework of policy adoption and lesson-drawing to answer the questions (1) why would a state adopt the policy of retiree recruitment and (2) how is the policy adopted. Three states in different stages of retiree recruitment policy adoption were selected as case studies. Results show that different strategies in policy adoption were operating in each case study state. In each state development of retiree recruitment was in response to a need to diversify the state economy. The idea of retiree recruitment originated …

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Implementation Of Collaborative Problem-Based Learning In The Classroom: A Focus On Group Dynamics In Relation To Self-Esteem And Skill Acquisition Through The Generation Of A Web Page., Lynn Allison Dombrowski Jan 1997

Implementation Of Collaborative Problem-Based Learning In The Classroom: A Focus On Group Dynamics In Relation To Self-Esteem And Skill Acquisition Through The Generation Of A Web Page., Lynn Allison Dombrowski

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this research was to provide information concerning group dynamics and Problem-Based Learning (PBL) to school teachers and counselors to determine if student behaviors have any influence on acquiring skills and knowledge. In addition, self-esteem was measured and crossed with group dynamics. Prior to the research study, Consent and Assent Forms had to be signed by students and one parent or guardian. Students were provided an overview of the project including a packet of handouts which consisted of a project timeline of day to day activities, daily task assignments, and instructions on learning Hyper-Text Markup Language (HTML) and …

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Interface Load: Deformation Behavior Of Landfill Liner Systems Over Subsurface Cavities., Ghada Shaker Ellithy Jan 1997

Interface Load: Deformation Behavior Of Landfill Liner Systems Over Subsurface Cavities., Ghada Shaker Ellithy

Graduate Theses, Dissertations, and Problem Reports (ETD)

The leachate collection system and the double liner required by the EPA for solid and hazardous waste landfills consist typically of a combination of geosynthetics materials and natural or processed soils. This research is conducted to study the load-deformation behavior of a multi layered landfill liner system under stresses imposed by the waste fill. Experimental and analytical work achieved in this research is summarized as follows: (1) Experimental Evaluation of the shear stress-shear deformation characteristics of seven geosynthetic interfaces encountered in landfill lining systems in addition to four geosynthetic materials and three soils. The investigated materials included: Ottawa sand, kaoline …

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Effects Of Peer-Mediated Instructional Mnemonic Modeling Strategies On Learning Geographic Locations By Sixth-Grade Social Studies Students., Kimberly Bryan Jennings Jan 1997

Effects Of Peer-Mediated Instructional Mnemonic Modeling Strategies On Learning Geographic Locations By Sixth-Grade Social Studies Students., Kimberly Bryan Jennings

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study was designed to examine the effects of peer-mediated instructional mnemonic modeling strategies on learning geographic locations by sixth-grade social studies students. Experimental and control group scores, time-based memory retention, structural level of intervention, and experimental group attitudes were analyzed following the 10-week study. One teacher and 84 sixth-grade social studies students participated in the study. Experimental group students experienced peer-mediated mnemonic modeling activities during their regularly scheduled social studies classes while the control group received traditional geographic instruction only, which involved participation in the map outlining instructional process. Peer models were trained by the teacher as to the …

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Budgeting In The American States: Changes In Taxes And Spending, 1960-1992., David A. Ellis Jan 1997

Budgeting In The American States: Changes In Taxes And Spending, 1960-1992., David A. Ellis

Graduate Theses, Dissertations, and Problem Reports (ETD)

We have seen policy makers in the American states reevaluate and reestablish their taxing and spending priorities throughout the past thirty years. Over the same period, we have also seen the birth and demise of incrementalism as a comprehensive theory of budgetary politics. Yet, no new comprehensive theory of budgetary politics has emerged to replace incrementalism. The current study attempts to help fill the theoretical void in the literature on budgetary politics by providing a new and different way of modeling budgetary outcomes. First, a definition of the budget is provided that shows budgets are best described as interrelated systems. …

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Analysis And Design Optimization Of Fiber-Reinforced Plastic (Frp) Structural Beams., Pizhong Qiao Jan 1997

Analysis And Design Optimization Of Fiber-Reinforced Plastic (Frp) Structural Beams., Pizhong Qiao

Graduate Theses, Dissertations, and Problem Reports (ETD)

Considering current and future applications of composite materials in civil engineering structures, a need exists for developing a design analysis and optimization approach for FRP shapes to improve their performance efficiency and competitiveness in relation to conventional materials. An analytical approach for design of pultruded FRP shapes under bending is proposed, and based on this approach, a computer program is developed to carry out the analysis of FRP sections. This analytical approach combines micro/macromechanics analyses with the Mechanics of thin-walled Laminated composite Beam model (MLB) to evaluate the response of existing pultruded FRP beams. Based on buckling analyses of individual …

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Performance-Tunable Distributed Execution Of Object-Based Software., George Braden Rinard Jan 1997

Performance-Tunable Distributed Execution Of Object-Based Software., George Braden Rinard

Graduate Theses, Dissertations, and Problem Reports (ETD)

The central challenge in software engineering research and practice is to improve the quality and performance of software systems, while decreasing the cost for producing such systems. While the combination of parallel execution with component-based software construction provides opportunities for addressing the software development challenge, it also raises a fundamental distributed software engineering dilemma, not adequately addressed in the literature. This dilemma is a result of the following two observations: (1) The quality and productivity benefits of reusability accrue only when reusable components are used without modifications. (2) For improved performance in a distributed environment, it must be possible to …

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Finite Element Analysis Of A Debonded Total Hip Stem., Venkatesh C. Saligrama Jan 1997

Finite Element Analysis Of A Debonded Total Hip Stem., Venkatesh C. Saligrama

Graduate Theses, Dissertations, and Problem Reports (ETD)

Loosening of total joint replacements continues to be a major mode of failure in cemented total joint arthroplasty. Clinical investigations report failure of the stem-cement interface after total hip replacement may be an important factor in loosening of hip prostheses. There are basically two design philosophies to reduce the risk of cemented stem failure: promote bonding (i.e. pre-coat, rough surface) and promote debonding (i.e. polished surface). The latter approach is examined in this study. The influence of stem-cement debonding and the viscoelasticity of the bone cement was investigated using a smooth tapered collarless stem. It has been hypothesized that the …

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