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Corrosion Between Orthodontic Archwires And Bracket Couples, Brian Costello O'Leary
Corrosion Between Orthodontic Archwires And Bracket Couples, Brian Costello O'Leary
Graduate Theses, Dissertations, and Problem Reports (ETD)
Nickel-containing orthodontic wires have been reported to cause allergic reactions in sensitive individuals. An allergic reaction is related to corrosion of the alloys and subsequent leaching of nickel ions into the oral cavity. The purpose of this study was to determine if there is a significant difference in the corrosive potential of stainless steel, NiTi and TMA wires either alone or when coupled with a stainless steel bracket.;Using potentiostatic anodic polarization, the samples were tested in 0.9% NaCl solution at room temperature with neutral pH. The breakdown potentials of stainless steel, NiTi, TMA, and the stainless steel bracket were 600 …
Iron And Acid Removal From Acid Mine Drainage In Open Limestone Systems, Qingyun Sun
Iron And Acid Removal From Acid Mine Drainage In Open Limestone Systems, Qingyun Sun
Graduate Theses, Dissertations, and Problem Reports (ETD)
Passive systems, like wetlands, anoxic limestone drains, and open limestone channels, show promise for treating acid mine drainage (AMD) discharges. Open limestone channels have been developed for over ten years and the treatment effectiveness of AMD by open limestone systems shows wide variation. The variation is due to site conditions (slope and size of the limestone channel) but more importantly to the surface area of the limestone and iron concentrations in the water. Iron in AMD coats the limestone in open limestone systems thereby reducing the surface area available for reaction. Over time, the limestone appears to lose its ability …
Porosity Distribution Prediction Using Artificial Neural Networks, Fahad Abdullah Al-Qahtani
Porosity Distribution Prediction Using Artificial Neural Networks, Fahad Abdullah Al-Qahtani
Graduate Theses, Dissertations, and Problem Reports (ETD)
Reservoir characterization plays a very important role in the petroleum industry, especially to the economic success of the reservoir development. Heterogeneity can complicate the evaluation of reservoir properties. Porosity is the primary key to a reliable reservoir model.;Several studies in the literature indicated that accurate evaluation of reservoir properties can be made by the analysis of electric logs. Stringtown oil field in Tyler and Wetzel counties in the northwestern part of West Virginia was selected to conduct this study.;Artificial Neural Networks (ANN) is one of the latest technologies available to the petroleum industry. The objective of this study was to …
Effects Of Aging On Bond Between Frp And Concrete, John Dyer Barger
Effects Of Aging On Bond Between Frp And Concrete, John Dyer Barger
Graduate Theses, Dissertations, and Problem Reports (ETD)
Fiber Reinforced Polymer (FRP) composites are continuing to gain prominence for structural and non-structural applications all across the world. FRP composites are being used as complete structural systems or in conjunction with conventional materials leading to hybrid structures. The study of using FRP rebars and wraps to reinforce our nation's existing bridge decks, beams and columns is proving that they are economical as well as future material of choice.;This research deals with the bond behavior of FRP composite wraps adhered/bonded to concrete surface. Focus of the study is on the bond degradation when the hybrid structure is exposed to different …
Preliminary Investigation Of Culvert Outlet Baffle Block Geometry And Energy Dissipation, Conrad Russell Baston
Preliminary Investigation Of Culvert Outlet Baffle Block Geometry And Energy Dissipation, Conrad Russell Baston
Graduate Theses, Dissertations, and Problem Reports (ETD)
One method used to attenuate high-energy flow at culvert outlets, is the construction of baffle blocks. Baffle blocks are devices, generally of simplistic geometry, that impact the flow and reduce energy. The current baffle design used by the WVDOH has in some instances experienced problems with excessive sedimentation to the extent of causing culvert failure. The purpose of this investigation was to construct a testing device to allow for the testing of physical culvert and baffle block models and produce a preliminary design that would perform more efficiently than the current design. The new design would need to meet the …
Gas Production Forecasting Using Automatic Type Curve Matching, Walter Jonathan Diazgranados
Gas Production Forecasting Using Automatic Type Curve Matching, Walter Jonathan Diazgranados
Graduate Theses, Dissertations, and Problem Reports (ETD)
As the demand for natural gas has increased in the last years, also the need for forecast reliable gas recoveries. Gas type curves are one of the methods utilized to estimate future well performance. The purpose of this study is the utilization of the Aminian et al type curves to model gas well performance. Unlike other studies developed in the past, Aminian et al type curves account for important factors ignored in the derivation of the proposed theoretical solutions. Thus, the pressure dependency of gas viscosity and compressibility, as well as the pressure loss owing to non-Darcy flow, make of …
Point Doppler Velocimetry Measurements In Circular Jets, Patrick Michael Collins
Point Doppler Velocimetry Measurements In Circular Jets, Patrick Michael Collins
Graduate Theses, Dissertations, and Problem Reports (ETD)
Improvements have been made to an existing 2-component Point Doppler Velocimetry (PDV) system to improve instrument accuracy and repeatability and to reduce mean velocity offset. Most importantly, the original iodine cells have been replaced by vapor-limited iodine cells that are not influenced by room temperature variations. PDV is a non-intrusive laser based flow measurement technique with capabilities that are similar to hot wire anemometry, but without inserting a probe into the flow. The insertion of a probe into a flow can affect the flow, resulting in inaccurate measurements.;PDV measurements for 1 inch diameter standard, swirling, and annular jets have been …
Effect Of Debris-Induced Lift-Off On Magnetic Flux Leakage Inspection Results, Francisco Louis Valentine
Effect Of Debris-Induced Lift-Off On Magnetic Flux Leakage Inspection Results, Francisco Louis Valentine
Graduate Theses, Dissertations, and Problem Reports (ETD)
Debris is present in all pipelines and has the potential to cause debris-induced lift-off in magnetic flux leakage inspection tools. A test apparatus was developed to qualitatively examine the effect of debris-induced lift-off.;The results of this research indicate that debris-induced lift-off has a detrimental effect on magnetic flux leakage data. This increases the potential of pipeline defects being either undersized or missed.;To reduce or eliminate the effects of debris-induced lift-off, the pipeline should be regularly cleaned. This minimizes the occurrence of large accumulations of debris. If it is determined that debris is present in a pipeline, even in small quantities, …
Alloying Effects On High-Temperature Deformation Behavior Of Nickel Aluminide Intermetallics, Robert Adrian Coulter Ii
Alloying Effects On High-Temperature Deformation Behavior Of Nickel Aluminide Intermetallics, Robert Adrian Coulter Ii
Graduate Theses, Dissertations, and Problem Reports (ETD)
The objective of this research is to examine the possibility of using nickel aluminide for high temperature structural applications. NiAl is a desirable candidate based on its low density, high thermal conductivity, high melting temperature, and its proven oxidation resistance. Currently, limited ductility at lower temperatures and low creep resistance at high temperatures limit the capabilities of NiAl.;For this research four different alloys were investigated to determine the effects of alloy strengthening. The three elements are next to one another on the periodic table, which will provide the electron number effect (Mo vs. Nb) and the atomic size effect (Cr …
Substrate Cleaning Using A Remote Hydrogen Rf-Plasma, Srinivasan Prasanna
Substrate Cleaning Using A Remote Hydrogen Rf-Plasma, Srinivasan Prasanna
Graduate Theses, Dissertations, and Problem Reports (ETD)
The substrates (wafers) used in semiconductor processing have a surface oxide layer (the so-called native oxide layer) and a hydrocarbon contamination layer that must be removed before growing an epitaxial film of good quality. In this work, low temperature remote rf-hydrogen plasma cleaning of II-VI and silicon semiconductor surfaces was investigated as a preparation for subsequent deposition in molecular beam and gas source molecular beam epitaxy environments. The plasma was characterized using mass spectrometric methods to determine the identity and relative fluxes of ionic and neutral species and to determine the kinetic energies of the ionic species. Etching studies were …
Smart Card-Enabled Security Services To Support Secure Telemedicine Applications, Monoreet Mutsuddi
Smart Card-Enabled Security Services To Support Secure Telemedicine Applications, Monoreet Mutsuddi
Graduate Theses, Dissertations, and Problem Reports (ETD)
The Internet is quickly evolving into a standard and widely used mode of information transfer. Therefore internet's information transfer capabilities could be exploited by Secure Telemedicine Applications to securely transfer medical information. However the current day internet protocol stack does not provide much in terms of security for the data being transferred across it. In this thesis we explore how Cryptography along with Smart Cards can be used to implement application layer protocols, to enhance the security of data flowing across the internet in a Secure Telemedicine environment. This thesis also discusses the design and implementation of various system software …
Secure Telemedicine System For Home Health Care, Sridhar Vasudevan
Secure Telemedicine System For Home Health Care, Sridhar Vasudevan
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis describes a low-cost telemedicine system that provides home based patient care by linking patients with skilled nurses at the home care agency. The system employs compact vital signs sensors and a two-way real-time video conference over telephone lines. It stores the patient's medical records, still images and enforces clinical pathways during the televisits. Physicians, paramedics, and nurses can then have access to these records from anywhere, securely, through a Web browser.;This document discusses the underlying technologies, the features implemented in the prototype, and the methodologies used in developing the software. The prototype uses the Enterprise Java Bean [EJB] …
Virulence Of Cryphonectria Hypoviruses From Previous Release Sites, Paul Henry Chaloux
Virulence Of Cryphonectria Hypoviruses From Previous Release Sites, Paul Henry Chaloux
Graduate Theses, Dissertations, and Problem Reports (ETD)
In 1994 and 1995, Cryphonectria parasitica isolates singly or doubly infected with hypoviruses in the CHV3 genus, and lacking distinctive morphological abnormalities, were recovered near plots formerly used to release hypoviruses. This study tested the hypothesis that North American hypoviruses are evolving decreased virulence, and investigated hypovirus interactions affecting virulence in double-infections. Families of single conidial progeny (SCP), differing in infection status, and derived from six recovered, three release, and three comparison isolates were tested in three field experiments. All release isolates and four recovered isolates were debilitated by their CHV3-gh2-type hypoviruses. CHV3-sr2-type hypoviruses never caused debilitation. In family SG3-2 …
Production Of Urban Space In Kenya: Central-Local Government Power Relations In Mediating Space In Athi River Town., Francis Tama Koti
Production Of Urban Space In Kenya: Central-Local Government Power Relations In Mediating Space In Athi River Town., Francis Tama Koti
Graduate Theses, Dissertations, and Problem Reports (ETD)
Centrally controlled political and economic systems are popular among Third World countries. They however, become problematic particularly in rapidly growing urban areas where different forces compete for scarce resources, hence calling for an understanding of the nature of the relationships between the different forces that produce the urban environment. In Kenya, the basic assumption is that urban space is mediated by the local state. The author uses Athi River town, as a case study, through which survey questionnaires and informal interviews are conducted with key personnel of Mavoko Municipal Council on one hand, and central government ministries operating within the …
Toward Improving The Paper Map: Exploring And Implementing Digital And Virtual Campus Maps For West Virginia University., Thomas Luke Ritz
Toward Improving The Paper Map: Exploring And Implementing Digital And Virtual Campus Maps For West Virginia University., Thomas Luke Ritz
Graduate Theses, Dissertations, and Problem Reports (ETD)
This research examines significant design and map development issues in development of digital and virtual campus maps for West Virginia University. The theoretical frameworks of traditional cartography and digital mapping technologies reveal the interconnections between the elements of good map design and the complexities of mapping in the digital environment. The development of the campus maps for this research are part of a project that represents a working agreement between West Virginia University and the West Virginia State GIS Technical Center. Background information on the campus map project is presented to place the project in context and to illustrate the …
The Role Of Lois Marie Gibbs In The Love Canal Crisis And Its Effect On Federal "Superfund" Legislation, 1973-1981., Daniel Victor Kahler
The Role Of Lois Marie Gibbs In The Love Canal Crisis And Its Effect On Federal "Superfund" Legislation, 1973-1981., Daniel Victor Kahler
Graduate Theses, Dissertations, and Problem Reports (ETD)
In the spring of 1978, a young homemaker named Lois Marie Gibbs discovered that her child was attending an elementary school built on top of a 20,000 ton, toxic chemical dump in Niagara Falls, New York. Out of desperation, she organized her neighbors into the Love Canal Homeowners Association and struggled more than two years for relocation. Opposing the group’s efforts were the chemical manufacturer, Hooker Chemical Corporation, and local, state, and federal government officials who insisted that the leaking toxic chemicals, including dioxin the most toxic chemical known to man, was not the cause of high rates of birth …
Use Of Track-Etched Polycarbonate Filters In Series To Mimic The Total Human Lung Deposition In The Ultrafine And Fine Particle Range From 0.03 To 0.40 Microns., Jennifer Lynn Hornsby-Myers
Use Of Track-Etched Polycarbonate Filters In Series To Mimic The Total Human Lung Deposition In The Ultrafine And Fine Particle Range From 0.03 To 0.40 Microns., Jennifer Lynn Hornsby-Myers
Graduate Theses, Dissertations, and Problem Reports (ETD)
Three 3.0m polycarbonate track-etched filters were used in series in a 37 mm cassette and tested at 2.2 L/min using an automated filter tester to determine the filter assembly’s deposition curve as a function of particle size from 0.03 to 0.4 m. The filter assembly’s efficiency curve was compared to Stahlhofen’s resting with nose breathing and working with mouth breathing human total lung deposition curves used by the ICRP. Bias maps show that the shape of the filter assembly’s deposition curve matches the two lung deposition curves in the ultrafine range under these specific test conditions. The efficiency curve of …
The Coaxial Cavity Resonator As A Prototype Rf Ic Engine Ignition Source., Dustin Langdon Mcintyre
The Coaxial Cavity Resonator As A Prototype Rf Ic Engine Ignition Source., Dustin Langdon Mcintyre
Graduate Theses, Dissertations, and Problem Reports (ETD)
The Quarter Wave Coaxial Cavity Resonator (QWCCR) plasma igniter is designed, from requirements drawn from previous theoretical work, as an ignition source for an internal combustion engine. The present research has explored the implementation of the QWCCR into anICengine. The QWCCRdesignparameters of inner conductor length, loop geometry, and loop position were varied for two igniters of differing operating frequency. Variations of the QWCCR RF parameters as a function of engine geometry were studied by placing the igniter in a combustion chamber and manually varying the crank position. Three identical igniters were fitted with dielectric inserts and the parameters were studied …
The Metamorphosis Of Jewish Identities In Nineteenth Century Russia, 1801-1894., James Russell Weiss
The Metamorphosis Of Jewish Identities In Nineteenth Century Russia, 1801-1894., James Russell Weiss
Graduate Theses, Dissertations, and Problem Reports (ETD)
During the period between the ascension of Tsar Alexander I and Tsar Nicholas II, the Jews of Russia and Russian officials were engaged in a curious partnership. Both parties were concerned with determining the precise definition of Jewishness and how this would change during the course of the nineteenth century. Russian officials, in the main, wanted to refashion the Jews of Russia into Russophiles imbued with Russian mores and education but, on no account, were these "new Jews" to be considered true Russians since God had made them a distinct group from their Slavic neighbors. Being compelled to be a …
A Comparison Of The Profiles Of Successful And Unsuccessful Candidates For College Presidencies In The State College System Of West Virginia., Marie Ellen Carter
A Comparison Of The Profiles Of Successful And Unsuccessful Candidates For College Presidencies In The State College System Of West Virginia., Marie Ellen Carter
Graduate Theses, Dissertations, and Problem Reports (ETD)
Candidates (N = 609) for six presidencies in the State College System of West Virginia between 1995 and 1998 were studied and a comparison was made between successful candidates (n = 93) and unsuccessful candidates (n = 516). Successful candidates were defined as those who were judged by the search and screening committees to be best qualified to be interviewed. Candidate application packets and search committee records were the source of data. Independent variables included positions held by candidates at the time of application, baccalaureate graduation dates, education levels, major fields of graduate study, gender, and locations at the time …
The Usefulness Of Admission Data As A Predictor Of Completion Of An Associate Degree Nursing Program., Shelia Marie Kyle
The Usefulness Of Admission Data As A Predictor Of Completion Of An Associate Degree Nursing Program., Shelia Marie Kyle
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this descriptive study was to examine whether or not selected variables used in the admission process can predict and the extent to which they can predict whether or not the student will graduate from an associate degree nursing program. The independent variables for this study were: Licensed Practical Nurse (LPN), number of courses completed prior to beginning the nursing program, the pre-admission Grade Point Average (GPA), the number of science courses completed pre-nursing, the number of courses repeated to earn a grade of C or better pre-nursing, and the number of hours transferred from other institutions of …
The Effects Of Different Shifts On Injury And Illness Rates At A Manufacturing Facility., Angela M. Mattis
The Effects Of Different Shifts On Injury And Illness Rates At A Manufacturing Facility., Angela M. Mattis
Graduate Theses, Dissertations, and Problem Reports (ETD)
The study examined the impact of working different shifts on the injury and illness rates at a diesel engine factory. A retrospective study was conducted using injury data from 1995-1999 collected from the test site. The injury rates of the shifts were compared with each other and with other studies. The study showed that there was not a significant increase in the amount of injuries on the first shift as compared to the other two main shifts. This indicates that the off shifts may not necessarily cause an increase in the injury and illness rate at the facility. The results …
Comparative Assessment Of Bit Geometry And Cutting Parameters., Shiv Kumar Bhuvanapalli
Comparative Assessment Of Bit Geometry And Cutting Parameters., Shiv Kumar Bhuvanapalli
Graduate Theses, Dissertations, and Problem Reports (ETD)
The Objectives of this research are to evaluate the performance of cutting tool, having different geometric configurations, in regards to bit – rock interaction and dust generation. When the cutting process takes place, the main objective is to cut bigger blocks of land/ridge rather than small and less fine dust. It is also important to minimize the amount of airborne dust. The ratio of bit spacing to depth of cut, angle of attack and many other bit geometrical factors contribute to the amount of settled and respirable dust production. When rock is cut and two cutting bits are placed adjacently …
The Fracture Analysis And Remaining Life Estimation Of The Avlb Sub-Components., Jeong-Hoon Choi
The Fracture Analysis And Remaining Life Estimation Of The Avlb Sub-Components., Jeong-Hoon Choi
Graduate Theses, Dissertations, and Problem Reports (ETD)
The Armored Vehicle Launch Bridge (AVLB) is subjected to cyclic loading during its launching as well as tank crossing. The cyclic loading causes crack to initiate in critical bridge components, and to propagate. Unless these cracks are detected and repaired before they rapidly grow to reach their critical stage of propagation, the failure of bridge components can occur. According to the Preventive Maintenance Checks and Services (PMCS) from the U.S. Army, three AVLB components, the splice doubler angle, the splice plate, and the bottom chord, are susceptible to fatigue damage. In the present study, the laboratory fatigue tests on the …
Development Of System Parameters For Enhanced Cutting And Finishing Of Handglass Using A Carbon Dioxide Laser., Christopher Edward Thompson
Development Of System Parameters For Enhanced Cutting And Finishing Of Handglass Using A Carbon Dioxide Laser., Christopher Edward Thompson
Graduate Theses, Dissertations, and Problem Reports (ETD)
In handglass manufacturing, a need has been identified for a more efficient method to crack off glassware. Extended cutting and finishing times and high rates of breakage in the glassware hinder current methods. For example, due to the physical nature of thermal cracking, crack-off is not easily controlled and after separation is achieved, further finishing of the glassware is required. Depending on the glass properties and worker skill level, losses due to breakage can be as high as 80 percent in some product lines. The Laser Glass Cutting Machine (LGCM) is a joint project among the National Energy Technology Laboratory …
The Effects On Student's Personality Preferences From Participation In Odyssey Of The Mind., Scott A. Warner
The Effects On Student's Personality Preferences From Participation In Odyssey Of The Mind., Scott A. Warner
Graduate Theses, Dissertations, and Problem Reports (ETD)
The problem for the research was to determine what effects participation in the OM program had on the development of personality preferences in elementary school children. The purposes of the research were to: (1) provide research data to teachers that justifies the use of teaching strategies to meet the needs of students toward the development of their personality preferences, and (2) provide research data toward further investigation of inventive personality characteristics and the programs that encourage their growth and development. The subjects for the study were selected from students in grades 3 to 5 at two elementary schools within the …
The Development And Validation Of Science Learning Inventory (Sli): A Conceptual Change Framework., Mehdi Seyedmonir
The Development And Validation Of Science Learning Inventory (Sli): A Conceptual Change Framework., Mehdi Seyedmonir
Graduate Theses, Dissertations, and Problem Reports (ETD)
A multidimensional theoretical model, Conceptual Change Science Learning (CCSL), was developed based on Standard Model of Conceptual Change and Cognitive Reconstruction of Knowledge Model. The model addresses three main components of science learning, namely the learner's conceptual ecology, the message along with its social context, and the cognitive engagement. A learner's conceptual ecology is organized around three clusters, including epistemological beliefs, existing conceptions, and motivation. Learner's cognitive engagement is represented by a continuum from peripheral processing involving shallow cognitive engagement to central processing involving deep cognitive engagement. Through reciprocal, non-sequential interactions of such constructs, the learners' conceptual change is achieved. …
The Numerical Simulation Of The Flow Of An Injected Grout In Underground Room And Pillar Coal Mines., James Mark Stiles
The Numerical Simulation Of The Flow Of An Injected Grout In Underground Room And Pillar Coal Mines., James Mark Stiles
Graduate Theses, Dissertations, and Problem Reports (ETD)
This research was conducted to develop a computer program, Groutnet , to simulate the flow of a grout injected in a room and pillar coal mine. Previous rheological investigations have demonstrated that grouts composed largely of coal ash and water are Bingham fluids. Because the simulation of a large scale grout injection operation by solving the three dimensional equations of motion would be prohibitively expensive, the equations of motion were integrated in the vertical direction, and the unsteady and convective acceleration terms in the momentum equations were neglected. In order to achieve a closed set of equations, a uniform flow …
Revised Glacial Margins And Wisconsin Meltwater Paleoflood Hydrology In Slippery Rock Creek Basin, Central Western Pennsylvania, Gary John D'Urso
Revised Glacial Margins And Wisconsin Meltwater Paleoflood Hydrology In Slippery Rock Creek Basin, Central Western Pennsylvania, Gary John D'Urso
Graduate Theses, Dissertations, and Problem Reports (ETD)
Glacial margins mapped in Slippery Rock Creek basin during the 1950s are problematic. The number of sedimentological, mineralogical, petrological, and textural analyses used to distinguish glacial drifts in the southern portion of the basin were inadequate to resolve the margins. Furthermore, misidentification of man-made deposits as glacial drift led to erroneous interpretations regarding the extent and character of pre-Wisconsin glacial deposits, and appears to have influenced subsequent soil mapping. Canadian Shield erratic weathering was the primary tool used in this study to re-investigate the glacial margins. Erratics display one of three distinctive weathering rinds, so glacial deposits can be differentiated …
A Three-Phase Constitutive Model For Macrobrittle Fatigue Damage Of Composites., Gasser Farouk Abdelal
A Three-Phase Constitutive Model For Macrobrittle Fatigue Damage Of Composites., Gasser Farouk Abdelal
Graduate Theses, Dissertations, and Problem Reports (ETD)
Failure in materials occurs as a result of damage accumulation. Damage in composite material can be studied applying the continuum approach or the micromechanical approach. The continuum approach treats the composite material as transversely isotropic medium. In this approach, there is no distinction between the fiber and the matrix. The micromechanical approach studies the different damage mechanisms such as, fiber damage, fiber/matrix debonding, and matrix cracking. The research in this dissertation is focused on applying the micromechanical approach. A micromechanical macrobrittle damage (damage under monotonic load) model is developed and compared with available experimental data. Then an anisotropic fatigue damage …