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Nondestructive Testing Of Concrete Bridge Decks Using Ground-Penetrating Radar And The Chain Drag Method, Jerry J. Scheff
Nondestructive Testing Of Concrete Bridge Decks Using Ground-Penetrating Radar And The Chain Drag Method, Jerry J. Scheff
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis presents the findings of two different nondestructive techniques that are used for bridge deck analysis: the chain drag method and ground penetrating radar (GPR). The chain drag testing was performed in the laboratory with 23 simulated concrete bridge deck specimens. The specimens contained varying internal conditions such as with/without steel reinforcement and with air and water filled cracks. The tests were to determine if the chains could uncover the different characteristics of each specimen, and to see if the varying sizes of the three chains had any influence on the outcome of the results.;The GPR testing was performed …
Identification Of Math Anxiety Subtypes, Aline Elizabeth Rabalais
Identification Of Math Anxiety Subtypes, Aline Elizabeth Rabalais
Graduate Theses, Dissertations, and Problem Reports (ETD)
Conceptualizations of mathematics anxiety, as well as factors that are empirically related to it, were identified from the existing literature. These factors are test, evaluation, trait, and state anxiety, as well as gender and level of math ability. Differences in these factors were hypothesized to distinguish subtypes of highly math anxious individuals from one another. In order to determine whether subtypes exist, cluster analyses were performed on a sample of 96 highly math anxious college students. The results revealed three clusters distinguished by completion time on two versions of a math test and age. Furthermore, participants' responses on a variety …
School Bus Crashworthiness, Ganesh R. Panneer
School Bus Crashworthiness, Ganesh R. Panneer
Graduate Theses, Dissertations, and Problem Reports (ETD)
Numerical simulation of automotive crashes play an important role in reducing the cost and time taken for predicting the results of a collision. Computer simulation of a vehicle requires that the vehicle structure be modeled in a finite element package by discretizing the geometry into a number of elements.;Every day thousands of children travel to school and school related events by bus. Not necessarily all the journeys are short and safely driven. The potential for serious injuries is possible in the event of a crash. The severity of injury in an offset frontal impact is higher than the full frontal …
Development And Accuracy Determination Of A Two-Component Doppler Global Velocimeter (Dgv), Stephen M. Naylor
Development And Accuracy Determination Of A Two-Component Doppler Global Velocimeter (Dgv), Stephen M. Naylor
Graduate Theses, Dissertations, and Problem Reports (ETD)
A two-component Doppler Global Velocimeter (DGV) system was constructed and tested to research problems associated with the accuracy of this unique system. The uniqueness of the system lies in its ability to simultaneously and non-intrusively measure velocities in a laser illuminated plane. A key component of the system is a frequency discriminating optical filter containing iodine vapor which allows direct measurement of the Doppler frequency shift caused by particle motion. Corrections for optical distortions and non-uniform intensities as well as the conversions from intensity data to velocity data are performed by an extensive image processing algorithm. Measurements were made of …
Design Of Powered Supports For Longwall Mining., Jinsheng Chen
Design Of Powered Supports For Longwall Mining., Jinsheng Chen
Graduate Theses, Dissertations, and Problem Reports (ETD)
For the purposes of production and safety, the roof exposed in the working area of a longwall face must be supported and protected. A hydraulic powered support with an improper structural design or insufficient capacity may result in roof failure or falls at the face, or its structural failure under intensive roof activity, while a heavier-than-required support can dramatically increase its cost. To ensure a safe and stable face condition at a minimum cost during the longwall retreat, the roof loading behavior above the face support, the structural stability and resultant loads of a hydraulic powered support under different mining …
Organizational Culture And Leadership At Berea College: An Historical Inquiry Into Saga Development And Underlying Cultural Assumptions., Gerald Emerson Wood
Organizational Culture And Leadership At Berea College: An Historical Inquiry Into Saga Development And Underlying Cultural Assumptions., Gerald Emerson Wood
Graduate Theses, Dissertations, and Problem Reports (ETD)
Culture is a pervasive concept that is not easily encompassed in any one definition. Culture within an organization is both process and product. It is both a dynamic agent of influence within the temporal and spatial context of organizational life and an object of study approached from the actor's point of view and thickly described. My general interest is in the cultural context of colleges, and more specifically in the part that culture has played in the formation and transformation of the mission and role of Berea College as it has sought to educate marginalized people for nearly 150 years. …
Contact Characterization And Persistent Photoconductivity Effects In Mbe Grown N-Type Gallium Nitride., Stuart Thomas Frazier
Contact Characterization And Persistent Photoconductivity Effects In Mbe Grown N-Type Gallium Nitride., Stuart Thomas Frazier
Graduate Theses, Dissertations, and Problem Reports (ETD)
Over the last two decades researchers have tried to grow wide band gap semiconductors for their use as blue light and ultraviolet laser diodes, and for solar blind ultraviolet detectors. III-V nitrides have been investigated for over twenty years. Gallium nitride is one such wide band gap semiconductor that has gained much attention [1]. Gallium nitride is a very hard material, is chemically stable and can withstand high temperatures. Early on, Metalorganic Chemical Vapor Deposition (MOCVD) and Metalorganic Vapor Phase Epitaxy (MOVPE) were the choices of growth techniques for gallium nitride. However, as a potential alternate, many researchers have recently …
Determination Of Residual Stress Using Phase Shift Moire Interferometry., Wenhong Xu
Determination Of Residual Stress Using Phase Shift Moire Interferometry., Wenhong Xu
Graduate Theses, Dissertations, and Problem Reports (ETD)
In this research, a combined hole-drilling/phase shift moire interferometry method was applied to determine the residual stress state. This new method overcomes the drawbacks of the conventional hole-drilling/strain-gage method in that it has the advantage of high sensitivity full field measurement. For a cracked structure, the integrity of the structure depends not only on the external applied loads but also on residual stress state at the crack tip. Hence, determination of the residual stress intensity at the crack tip is essential to ensure the safety of the structure. In this research a hole-drilling/phase-shift moire interferometry method was developed to measure …
Performance Of Flexible Pavements Reinforced With Geogrids., Bora Kutuk
Performance Of Flexible Pavements Reinforced With Geogrids., Bora Kutuk
Graduate Theses, Dissertations, and Problem Reports (ETD)
This report presents the results of an investigation on the effectiveness of glass fiber grids as a reinforcement of the asphalt base layer in a flexible pavement. The study involved both laboratory experimental work and computer analysis of pavement sections. As part of the experimental work, twenty flexible pavement sections (with and without glass fiber grids) were constructed and tested in the laboratory. The laboratory-scale pavement sections were instrumented with pressure cells, displacement gages, and strain gages. Test sections were subjected to 1,000,000 load applications at a frequency of 1.2 Hz. Static loading tests were conducted at intervals of 100,000 …
Evaluation Of The Effect Of Temporal Variations In Flow Patterns On Capacity Design For Underground Coal Mine Belt Systems., Xueming Wang
Evaluation Of The Effect Of Temporal Variations In Flow Patterns On Capacity Design For Underground Coal Mine Belt Systems., Xueming Wang
Graduate Theses, Dissertations, and Problem Reports (ETD)
Belt conveyor haulage systems are critical to keep an underground-coal mine running profitably. It is not easy to design a reliable and efficient system. The issues associated with designing the capacity for a belt conveyor and a bunker are addressed in this dissertation. Several design models have been discussed, and discrete-event simulation models are recommended as the most flexible and useful tools. Most of the simulation models require the use of a step-function model to describe the loading process at each loading point. Over the years, simulation practitioners have generally employed one of the three conventional models, the peak loading …
Development Of A Tolerance Design Model In Manufacturing Assembly And Design Of Cost-Based Cusum Control Charts Using Taguchi Quality Loss Function., Jung-Dae Kim
Graduate Theses, Dissertations, and Problem Reports (ETD)
The quadratic loss function has been used in the statistical and control theory literature. Taguchi applied quadratic loss function to quality improvement. His quality loss function has been known to be effective in assessing quality loss in monetary terms, while most of the traditional quality control techniques, such as tolerance design and control chart design, use estimated cost factors. Taguchi's quality loss function concept is different from traditional methods in which all the values within the specification limits are equally acceptable. However, his idea is that for many products, parts elements and components, a target or nominal size or value …
Thermal Stress Prediction For Direct-Chill Casting Of A High Strength Aluminum Alloy., Jian Wan
Thermal Stress Prediction For Direct-Chill Casting Of A High Strength Aluminum Alloy., Jian Wan
Graduate Theses, Dissertations, and Problem Reports (ETD)
Direct chill (D.C.) casting is one of the most important semi-continuous methods for the production of high strength aluminum alloys. The enormous unevenly cooling of ingots during the casting process can cause significant thermally induced stresses, which may result in solidification cracking. The control of the cracking during DC casting is a state-of-art technology, and many finite element models have been applied to simulate the solidification process during ingot casting. So far, most of the simulations can predict the thermal fields of the ingot accurately, but very few works can get satisfactory thermal stress profiles. One of the major difficulties …
The Effects Of Asymmetry On The Lifting Capacities: The Psychophysical And Biomechanical Approaches., Baecheol Han
The Effects Of Asymmetry On The Lifting Capacities: The Psychophysical And Biomechanical Approaches., Baecheol Han
Graduate Theses, Dissertations, and Problem Reports (ETD)
The lifting motion with feet positioned in the middle between the origin and destination of a load (middle twist) has rarely been studied. The effects of asymmetry for the middle twist and turning were examined in detail up to 180{dollar}\\sp\\circ{dollar} of task angle in this research. The purpose of this study was to investigate the effects of asymmetry on a worker's lifting capacities by employing the psychophysical and biomechanical approaches. Ten male college students lifted a box from pallet height (15cm) to conveyor height (75cm). In the psychophysical experiment, three types of asymmetric lifting tasks were studied: turning, middle twist, …
Choice, Changing Over, And Reinforcement Delay., Timothy Alan Shahan
Choice, Changing Over, And Reinforcement Delay., Timothy Alan Shahan
Graduate Theses, Dissertations, and Problem Reports (ETD)
The independent effects of two normally confounded delays to reinforcement produced by changing between concurrent variable-interval schedules of reinforcement were examined with pigeons. In Experiments 1 and 2, combinations of changeover delays and fixed-interval travel requirements were arranged for changeovers in a changeover-key concurrent schedule procedure. The delay from a changeover-produced change in stimulus conditions to a reinforcer was varied while the delay between the last response on one alternative and a reinforcer on the other (the total obtained delay) was held constant. Changeover rates decreased as a negative power function of the total obtained delay. The delay between a …
Innovative Ultrasonic Methodology For Fatigue Crack Detection In Steel Members., Reynold Franklin
Innovative Ultrasonic Methodology For Fatigue Crack Detection In Steel Members., Reynold Franklin
Graduate Theses, Dissertations, and Problem Reports (ETD)
The primary objective of nondestructive testing and evaluation in metallic structural members is to identify and quantify damages and predict member behavior. In this aspect detection of fatigue cracks is of great importance. Steel bridge members are subjected to heavy loads and large number of cyclic stresses. Weak zones, such as near a weld, may eventually develop fatigue cracks. Currently, a major obstacle for ultrasonic field inspection for detecting fatigue cracks is surface preparation (removal of paint and rust). This research describes the development of an innovative ultrasonic testing methodology to detect fatigue cracks in uncoated, painted, and rusted steel …
A Universal Amperometric Membrane-Covered Gas-Sensing Electrodes System: Measurement Of Dissolved Oxygen, Ozone And Chlorine Dioxide., Rener Wang
Graduate Theses, Dissertations, and Problem Reports (ETD)
A Universal Amperometric Membrane-Covered Gas-Sensing Electrode System has been designed which can be used with a wide variety of electrochemical sensors. The system is composed of two parts: an electrode detection unit consists of an Intel 8051 microprocessor as the control unit which receives operational commands through the serial port of a personal computer. The assembly language has been written and is embedded in a 32K EPROM and the data collected are temporarily stored in a 32K RAM. A potentiostat with an auto-adjustable 100 nA to 100 {dollar}\\mu{dollar}A range is used to polarize the electrode. A 12 bit D/A convertor …
Developing Telephony Applications Using Reusable Software Components In A Graphical Application Implementation Environment., William H. Dodrill
Developing Telephony Applications Using Reusable Software Components In A Graphical Application Implementation Environment., William H. Dodrill
Graduate Theses, Dissertations, and Problem Reports (ETD)
Computer telephony applications potential is impressive, however telephony applications implementation is exceptionally challenging. This work was initiated as a result of several disappointing previous attempts to incorporate telephony capabilities into a graphical application building environment which features the use of reusable software components. This presentation includes working code for an illustrative telephony application (a terminal emulator). A detailed implementation for the JavaBeans application implementation environment is developed and presented. The JavaBeans environment is representative of graphical application building environments which feature the use of reusable software components. Interaction with the telephony hardware uses Microsoft's TAPI (Telephony Application Programming Interface). Implementation …
Economies Of Scale, Overcapitalization And Asset Pricing In The United States Electric Utility Industry., Russell Rhine
Economies Of Scale, Overcapitalization And Asset Pricing In The United States Electric Utility Industry., Russell Rhine
Graduate Theses, Dissertations, and Problem Reports (ETD)
The following dissertation is the consolidation of three research projects in the U.S. electric utility industry. The first essay tests for scale economies in the electric utility industry using a panel data set of fossil fuel and nuclear fuel utilities. In addition, a variable cost function is used as opposed to a total cost function because the assumption of cost minimizing production inputs is not met. That is, electric utilities are overcapitalized. Therefore, the optimal capital stock is estimated and an estimate of economies of scale is generated. Evidence suggests that firms are operating on the negatively sloped portion of …
Determining The Environmental Training Needs And Training Preferences Of Tribal Officials On Reservations In The United States., Jeeta Lakhani Saxena
Determining The Environmental Training Needs And Training Preferences Of Tribal Officials On Reservations In The United States., Jeeta Lakhani Saxena
Graduate Theses, Dissertations, and Problem Reports (ETD)
The problem of this research was to determine the priority environmental management training needs (drinking water, wastewater, and solid waste), classroom training system preferences and related cultural factors of Native American tribal officials with environmental responsibilities living on reservations in the United States. The researcher conducted telephone interviews with 18 tribal officials on reservations in diverse geographic areas of the United States to determine their classroom training preferences. These officials also responded to a mail/fax survey comprised of 28 statements describing their environmental responsibilities in the areas of drinking water, wastewater, and solid waste. Tribal officials indicated how important the …
Influence Of Polymeric Additives On The Melting And Crystallization Behavior Of Nylon 6,6., Parvinder Singh Walia
Influence Of Polymeric Additives On The Melting And Crystallization Behavior Of Nylon 6,6., Parvinder Singh Walia
Graduate Theses, Dissertations, and Problem Reports (ETD)
The goal of this research was to find polymeric additives that would significantly decrease the rate of crystallization in nylon 6,6, in order to enhance mechanical properties indirectly. Since miscibility was essential, different classes of materials considered included amorphous and semi-crystalline nylons, and other polymers known to be compatible with polyamides. These additives were blended with nylon 6,6 using solution and melt blending techniques. The change in thermal behavior of the blends was evaluated using data obtained with a Differential Scanning Calorimeter (DSC) and Dynamic Mechanical Thermal Analyzer (DMTA). Reduction in the crystallization temperature (T{dollar}\\sb{lcub}\\rm c{rcub}){dollar} during a non-isothermal DSC …
Water Demand Management For Casablanca, Morocco., Mohamed Lahlou
Water Demand Management For Casablanca, Morocco., Mohamed Lahlou
Graduate Theses, Dissertations, and Problem Reports (ETD)
Water shortages could significantly curtail economic growth and development in Casablanca, Morocco. Conservation programs in Morocco have been implemented only occasionally, usually during a water shortage crisis arising either from technical reasons or from drought. Public awareness activities suffer from a lack of effectiveness and do not fulfill the desired objectives. The purposes of this study are to examine water consumption characteristics in Casablanca and develop approaches for water management to help assure that shortages will not undermine the prospects for sustainable economic development. Research procedures used were the development and estimation of water demand models for the residential/commercial, industrial, …
A Transient Computational Fluid Dynamic Model Of A Unit Injector Using Methanol Fuel., Eugene Anthony Mckenzie
A Transient Computational Fluid Dynamic Model Of A Unit Injector Using Methanol Fuel., Eugene Anthony Mckenzie
Graduate Theses, Dissertations, and Problem Reports (ETD)
The use of alternative fuels such as Ethanol, Methanol and Natural Gas in automotive applications has increased due to the strict environmental regulations. These are used to reduce automotive emissions, especially in heavy trucks and city bus fleets. Most of these vehicles use diesel fuel as their primary fuel. Trucks and buses with Detroit Diesel engines have the option to operate using methanol as their primary fuel instead of diesel fuel. Due to the low lubricity of methanol fuel, the unit fuel injectors injecting methanol fuel have a shorter operating life than those injecting diesel fuel do. To study the …
Parametric Study Of Dust Generation With Rock Ridge Breakage Analysis Using A Simulated Continuous Miner., Venkata Babu Achanti
Parametric Study Of Dust Generation With Rock Ridge Breakage Analysis Using A Simulated Continuous Miner., Venkata Babu Achanti
Graduate Theses, Dissertations, and Problem Reports (ETD)
Efficient rock breakage is a result of optimum use of available resources in a continuous mining system. Research demonstrates that specific respirable dust must be kept at a minimum in order to produce the optimum parameters of rock breakage process. A cutting process that induces large chips of cut product results in minimum respirable dust. To produce larger chips of cut product, a correct inter-play of several bit geometry related parameters is essential. As the ridges/lands between two adjacent grooves are removed, a free surface is available for subsequent cuts. The nature of ridge failure is a function of the …
A Design Of Fault Tolerant Flight Control Systems For Sensor And Actuator Failures Using On-Line Learning Neural Networks., Younghwan An
A Design Of Fault Tolerant Flight Control Systems For Sensor And Actuator Failures Using On-Line Learning Neural Networks., Younghwan An
Graduate Theses, Dissertations, and Problem Reports (ETD)
The research in this document focuses on the performance of a neural network-based fault tolerant system within a flight control system. This fault tolerant flight control system integrates sensor and actuator failure detection, identification, and accommodation (SFDIA and AFDIA). The SFDIA task is achieved by incorporating a main neural network (MNN) and a set of n decentralized neural networks (DNNs) for a system with n sensors assumed to be without physical redundancy. Particularly, the purpose of the MNN is to detect a wide variety of sensor failures while the purpose of the DNNs is to identify the particular sensor that …
Perceptions Of Puerto Rican Undergraduates Of Reasons For Their Academic Success., Maria Teresa Baxter
Perceptions Of Puerto Rican Undergraduates Of Reasons For Their Academic Success., Maria Teresa Baxter
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to learn what might have contributed to the academic success of Puerto Rican undergraduates. The investigation centered around the perceptions of the participants about the role and significance of socio-economic status, compatibility of the home and school environments, bilingualism, encouragement, and motivation. A qualitative design was used. Ten participants of Puerto Rican origin, undergraduate students at a major university in the northeast were interviewed at their university. The data was recorded on audio cassette tapes. The answers to the questionnaire suggested that the participants had families who valued education regardless of their socio-economic status. …
An Assessment Of Presidential Perceptions Of Goal Compliance Stated In West Virginia Senate Bill 547., Mark Stephen Carter
An Assessment Of Presidential Perceptions Of Goal Compliance Stated In West Virginia Senate Bill 547., Mark Stephen Carter
Graduate Theses, Dissertations, and Problem Reports (ETD)
The article is a report of a qualitative study to determine whether Presidents of West Virginia higher education institutions maintain attitudes commensurate with goal statements contained in Senate Bill 547: a West Virginia legislative initiative that requires institutional compliance with various legislated goals. Findings of the study are presented in a brief, case study format for each President. In addition, a global assessment of Presidential perceptions with associated issues of compliance/noncompliance is presented.
Fracture Mechanics Of Human Cortical Bone: The Relationship Of Geometry, Microstructure And Composition With The Fracture Of The Tibia, Femoral Shaft And The Femoral Neck., Yener Nail Yeni
Graduate Theses, Dissertations, and Problem Reports (ETD)
Bone fracture is a major health problem in old population with its complications leading to mortality and morbidity. Therapies mostly involve preventing bone mass loss. Individuals with high bone mass, however, may still suffer fractures suggesting that additional components such as bone microstructure and composition may be responsible for increased fracture risk in the elderly. The relationship of bone constituents with bone fragility, however, is not well-understood. A better understanding of these relationships will help improving therapies by controlling the relevant biological processes. Bone is a composite material with many constituents such as osteons embedded with vascular channels, collagen fibers, …
An Evaluation Of The Relative Value Of Spectral And Phenological Information For Tree Crown Classification Of Digital Images In The Eastern Deciduous Forest., Thomas Lee Key Jr.
An Evaluation Of The Relative Value Of Spectral And Phenological Information For Tree Crown Classification Of Digital Images In The Eastern Deciduous Forest., Thomas Lee Key Jr.
Graduate Theses, Dissertations, and Problem Reports (ETD)
Digitized, multitemporal, small format 35 mm aerial photographs were acquired, processed, and classified to determine the relative value of spectral and phenological information for tree crown classification of digital images of the Eastern Deciduous Forest. The one-hectare study site, located in a second-growth forest 15 km east of Morgantown, West Virginia, was photographed from a light aircraft ten times from May to October 1997 using both true color and false color film. The negatives and positive transparencies were scanned, and then rectified, enhanced, and classified using ERDAS Imagine. Differences in the timing of phenologic events between tree species, specifically leaf …
American Workers In The Soviet Union Between The World Wars: From Dream To Disillusionment., Vincent Edward Baker
American Workers In The Soviet Union Between The World Wars: From Dream To Disillusionment., Vincent Edward Baker
Graduate Theses, Dissertations, and Problem Reports (ETD)
This is a an examination of those Americans who went to the Soviet Union to live and work during the interwar period, and what became of them. Why they went, how many went, and whether they survived the experience. American attitudes, both private and public of the Soviet Union are also discussed.
A Study Of Impact Using 80-Derometer Rubber., Steven Harold Howard
A Study Of Impact Using 80-Derometer Rubber., Steven Harold Howard
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this work was to model and test an intermediate material that would absorb impact loads induced during deployment of a deployable rollover protective structure (ROPS) designed for use on a farm tractor. The design criteria required that the intermediate material, under compressive loads, maintain the integrity of all moving parts while introducing a minimum impact time of 0.005 seconds. A "ring" shaped part made of 80-Derometer rubber (a product of the Goodyear Corporation) was incorporated into the impact region of the ROPS deployment mechanism. Theoretical calculations were made based on energy balance equations and 2-D Working Model …