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Experimental Study Of Thermosiphon Performance, Sumeeth S. Sivanagere Aug 2002

Experimental Study Of Thermosiphon Performance, Sumeeth S. Sivanagere

Graduate Theses, Dissertations, and Problem Reports (ETD)

A model single phase loop thermosiphon was designed and built such that velocity profiles and heat transfer rates could be studied by obtaining temperature data, along with a detailed set of non-intrusive Laser Doppler Velocimetry measurements. The quantities measured were the instantaneous velocity profiles for the water flow. These velocities were then reduced into sets of mean and root mean square velocities, for different angles of tilt of the experimental setup. Nominal heating and cooling rates were held constant.;The single phase thermosiphon consisted of an aluminum flow loop, fitted with a test section made of Plexiglas, that was rectangular in …

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Ant Colony Heuristics For The Dynamic Facility Layout Problem, Jin Shang Aug 2002

Ant Colony Heuristics For The Dynamic Facility Layout Problem, Jin Shang

Graduate Theses, Dissertations, and Problem Reports (ETD)

As global economic competition and cooperation become more and more drastic, the enterprise's facility layout needs to be more flexible to adapt to the rapidly changing environment. Therefore, attention should be given to the dynamical nature of the facility layout. In other words, the flow of materials between departments changes during the planning horizon (multiple periods) and should be considered. This problem is known as the dynamic facility layout problem (DFLP).;This research proposes three heuristics based on the ant colony optimization (ACO) heuristic to solve the DFLP. The performance of the heuristics was evaluated using two data sets taken from …

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Phase Equilibrium Study Of Methane Hydrate, Rahul Shukla Aug 2002

Phase Equilibrium Study Of Methane Hydrate, Rahul Shukla

Graduate Theses, Dissertations, and Problem Reports (ETD)

Gas hydrates are solid metastable ice like compounds formed when gas comes in contact with water and have the ability to form at low temperatures. In this study, methane gas hydrates were formed in a Berea sandstone core, which was saturated with brine and then pressurized with methane gas. The formation temperatures were 34°F, 36°F and 40°F and the initial pressures were in the range of 1000--1200 psi. Variation of the methane pressure was monitored with time during the formation run. Dissociation experiments were then carried out and the pressure profile along the core with time was recorded. The volume …

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Study Of Natural Gas Vehicles (Ngv) During The Fast Fill Process, Eric Paul Shipley Aug 2002

Study Of Natural Gas Vehicles (Ngv) During The Fast Fill Process, Eric Paul Shipley

Graduate Theses, Dissertations, and Problem Reports (ETD)

Natural gas is being used as an alternative fuel to gasoline. Natural gas vehicle (NGV) refueling stations, however, are not able to guarantee a 100% full fill to NGV's. A system was designed and built to better understand the characteristics of CNG during the fill process. Useful characteristics of CNG during the fill process are temperature, pressure, and flow rate, as well as, total volume dispensed. CNG is dispensed to an NGV through a process known as the fast fill process, since it is completed in less than five minutes. The system that was built is transportable, which means that …

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Evaluation Of Two Reference Planes To The Horizon In The Natural Head Position, David M. Allport Aug 2002

Evaluation Of Two Reference Planes To The Horizon In The Natural Head Position, David M. Allport

Graduate Theses, Dissertations, and Problem Reports (ETD)

Dental casts are mounted to dental articulators using anatomical records in order to simulate and duplicate static and dynamic interocclusal relationships. The three dimensional relationship of the maxillary arch to the transverse horizontal axis of the mandible is defined by establishing a third point of reference. The purpose of this study was to examine the relationship of the Frankfort horizontal plane and the HIP plane to the horizontal when the patient is in the natural head position. Ten subjects were evaluated in the natural head position with angular measurements made from lateral photographs and lateral skull radiographs to determine the …

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Effects Of Edge And Coarse Woody Debris On Small Mammal Communities In Riparian And Upland Habitats In Northern West Virginia, Joseph Daniel Osbourne Aug 2002

Effects Of Edge And Coarse Woody Debris On Small Mammal Communities In Riparian And Upland Habitats In Northern West Virginia, Joseph Daniel Osbourne

Graduate Theses, Dissertations, and Problem Reports (ETD)

The effects on biological communities of human-induced disturbances such as road construction for logging and military activities are a topic of much controversy in modern society. Furthermore, the response of small mammal communities to edge and coarse woody debris (CWD) volume in riparian and upland habitats of the central Appalachian Mountains has received little attention. The objectives of this study were to: (1) Perform a faunal survey of the Camp Dawson Collective Training Area in Preston County, West Virginia with an emphasis on rare and endangered species, (2) Estimate small mammal abundance, diversity, and condition in response to CWD manipulation, …

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Reducing Interferences In Glow Discharge Spectroscopies Using Transient Operation And Collision -Induced Dissociation, Glen Paul Jackson Aug 2002

Reducing Interferences In Glow Discharge Spectroscopies Using Transient Operation And Collision -Induced Dissociation, Glen Paul Jackson

Graduate Theses, Dissertations, and Problem Reports (ETD)

Plasma sources for optical spectroscopy and mass spectrometry have provided scientists unprecedented knowledge about the fundamental properties and behavior of matter. As informative and useful as these methods are; however, there is still considerable room for improvement. The accuracy and precision of quantitative analyses by mass spectrometry and optical emission spectroscopy are often dependent on the presence of interferences. Interferences are defined as a measured signal response to a species at the spectral position of interest for the analyte that is not caused by the analyte. Because the presence of spectral interferences can deleteriously affect the integrity of reported results, …

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Gamma Prime Precipitation Modeling And Strength Responses In Powder Metallurgy Superalloys, Jian Mao Aug 2002

Gamma Prime Precipitation Modeling And Strength Responses In Powder Metallurgy Superalloys, Jian Mao

Graduate Theses, Dissertations, and Problem Reports (ETD)

Precipitation-hardened nickel-based superalloys have been widely used as high temperature structural materials in gas turbine engine applications for more than 50 years. Powder metallurgy (P/M) technology was introduced as an innovative manufacturing process to overcome severe segregation and poor workability of alloys with high alloying contents. The excellent mechanical properties of P/M superalloys also depend upon the characteristic microstructures, including grain size and size distribution of gamma' precipitates. Heat treatment is the most critical processing step that has ultimate influences on the microstructure, and hence, on the mechanical properties of the materials. The main objective of this research was to …

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Development Of The Induced Gonadotropin Surge Mechanism In The Prepubertal Heifer, Timothy David Maze Aug 2002

Development Of The Induced Gonadotropin Surge Mechanism In The Prepubertal Heifer, Timothy David Maze

Graduate Theses, Dissertations, and Problem Reports (ETD)

A longtitudinal study was performed in prepubertal heifer calves to determine when the individual components of the hypothalamic-pituitary-ovarian axis were capable of functioning. In study 1, the hypothalamus and anterior pituitary of prepubertal dairy heifers were challenged with exogenous hormones (estradiol and GnRH, respectively) to determine at what age gonadotropin surges could be induced. Two-, four-, six-, and eight-month-old heifer calves were challenged with GnRH or estradiol. Blood was sampled from the jugular vein every 15 minutes for 6 hours or hourly for 30 hours, for the two treatments, respectively. Heifers in each age group released LH in response to …

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Students' Attitudes, Knowledge, And Commitment To Implementation Of Multicultural Education In A Teacher Education Program, Pei Jian Zhou Aug 2002

Students' Attitudes, Knowledge, And Commitment To Implementation Of Multicultural Education In A Teacher Education Program, Pei Jian Zhou

Graduate Theses, Dissertations, and Problem Reports (ETD)

In recent years, there are more research studies in the field of teacher education. These research studies examine the effects of multicultural education initiatives on the change of students' attitudes and perspectives on multicultural education in teacher education programs. The results of there research studies have revealed that further studies are called for in this area of study, because the results of the previous studies are not always positive and clear. The purpose of this study is to see if there is any attitude change during the program, how the five-year teacher education program enhances the pre-service teacher education experience …

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Use Of West Virginia Permanent Traffic Recorder Data To Develop Factors For Traffic And Truck Variation, Jacob Scott D'Angelo May 2002

Use Of West Virginia Permanent Traffic Recorder Data To Develop Factors For Traffic And Truck Variation, Jacob Scott D'Angelo

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to use data collected from the 52 permanent count stations located throughout the state to develop four sets of factors that would assist the West Virginia Department of Transportation (WVDOT) in the management and engineering of the roadways in West Virginia.;The objectives of this study were to: (1) Establish correction factors that can be applied to the short-term single pneumatic tube traffic count stations to adjust for the effect of three or more axle trucks on the volume counts. (2) Establish factors that use the peak hour volume (PHV) to estimate the design hour …

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Establishing Design Vehicles For The Hang-Up Problem, Amy Lorraine Clawson May 2002

Establishing Design Vehicles For The Hang-Up Problem, Amy Lorraine Clawson

Graduate Theses, Dissertations, and Problem Reports (ETD)

Current design vehicles do not address the hang-up problem. Two factors affect hang-ups: vehicle geometry and roadway geometry. There is a need to establish design vehicle characteristics for hang-up prone vehicles to reduce hang-ups potential.;Roadway geometry and vehicle characteristics relative to the hang-up problem were reviewed. Consideration of these properties by key organizations and associations, and government regulations were studied, and research performed by individuals establishing other design vehicles were analyzed. A general methodology was established.;When choosing design vehicles for the vehicle population, variation in vehicle population, the ramifications of using a limited number of vehicles, and local conditions were …

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Flow Unit Prediction With Limited Permeability Data Using Artificial Neural Network Analysis, Benjamin Hale Thomas May 2002

Flow Unit Prediction With Limited Permeability Data Using Artificial Neural Network Analysis, Benjamin Hale Thomas

Graduate Theses, Dissertations, and Problem Reports (ETD)

The Appalachian Basin has numerous abandoned or marginally producing oilfields having significant recoverable oil remaining in place. Typically production records and reservoir data is not available. Presented is a new methodology, applicable to any field having limited records, designed for reservoir characterization via flow unit identification.;This methodology utilizes limited core permeability data from a few wells as a key to predicting flow units within a field when only log-based data is available. Primary software tools used include NeuroShell 2, an artificial neural network (ANN) program, and the Boast98 numerical simulator.;Various techniques for flow unit identification including graphic approaches using the …

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Perceived Efficacy And Utilization Of The Oralcdx Brush Biopsy, Courtney Niccole Huffman May 2002

Perceived Efficacy And Utilization Of The Oralcdx Brush Biopsy, Courtney Niccole Huffman

Graduate Theses, Dissertations, and Problem Reports (ETD)

The OralCDx is a preliminary screening tool developed to identify suspicious lesions. Despite large numbers of persons diagnosed with oral cancers annually, minimal research has been conducted on the efficacy and utilization rates of OralCDx. The purpose of this study is to determine perceived efficacy and utilization rates of OralCDx nationwide. A 16-item survey was used to survey a random sample of 100 dentists and a 6-item survey was used to survey a random sample of 400 patients. Data analyses were conducted using frequencies, cumulative frequencies, percents, analysis of variance, and tests of chi-square using the JMP program. Preliminary results …

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Herbal Supplement Education In Dental Hygiene Curricula, Lisa Elena Lisauckis May 2002

Herbal Supplement Education In Dental Hygiene Curricula, Lisa Elena Lisauckis

Graduate Theses, Dissertations, and Problem Reports (ETD)

While there is evidence in the literature of herbal supplement education in other disciplines, inclusion in dental hygiene curricula is not reported. The purpose of this study was to assess the prevalence and extent of herbal supplement education in the 256 accredited dental hygiene programs in the United States. A survey was sent to program directors. Data analyses, including frequencies, cumulative frequencies, percentages, analyses of variance, and test of Chi Square were conducted using JMP program. Surveys revealed 63% of respondents (n = 160) included herbal supplement education and primarily incorporated it in the pharmacology course (67%). Statistically significant differences …

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Retention Of Early Pregnancy And Its Relationship To Serum Progesterone In Dairy Cattle, Melanie J. Starbuck May 2002

Retention Of Early Pregnancy And Its Relationship To Serum Progesterone In Dairy Cattle, Melanie J. Starbuck

Graduate Theses, Dissertations, and Problem Reports (ETD)

Factors affecting pregnancy maintenance between 28 and 67 days of gestation were studied in dairy cows (N = 211). Beginning on day 28 to 37 post breeding, cows were examined by ultrasonography for a viable pregnancy. Pregnant cows were re-examined for pregnancy losses during the late embryonic (≤day 45) and early fetal stages up to day 67. Overall pregnancy loss was 11%, mostly occurring before day 45. Cows with two corpora lutea maintained fewer pregnancies than cows with one corpus luteum. Pregnancy retention was less when concentrations of progesterone were low during days 28 to 37. The embryo apparently died …

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Doping And Electron-Stimulated Desorption Of Zinc Selenide Grown By Molecular Beam Epitaxy, Brenda L. Vanmil May 2002

Doping And Electron-Stimulated Desorption Of Zinc Selenide Grown By Molecular Beam Epitaxy, Brenda L. Vanmil

Graduate Theses, Dissertations, and Problem Reports (ETD)

Electron irradiation affects ZnSe and ZnMgSe during growth by molecular beam epitaxy. Se desorption rates under electron irradiation are significantly larger than thermal desorption rates. Electron irradiation decreases ZnSe growth rates under Zn-stable conditions, which can be suppressed by Se-stable conditions or use of (211)B oriented substrates. Electron irradiation does not alter composition during ZnMgSe growth.;Chlorine-doped ZnSe and ZnMgSe layers were grown to investigate solubility, native defects and chlorine-impurity-related defects. Cl was electrically active for levels up to 1 x 1019 cm-3 with compensation occurring beyond this point. Compensation appeared coupled to reduced growth rates for higher chlorine fluxes. Cl …

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Design, Construction And Testing Of An Innovative Mechanism For Manual Wheelchair Propulsion, Thomas S. Burke Jr. May 2002

Design, Construction And Testing Of An Innovative Mechanism For Manual Wheelchair Propulsion, Thomas S. Burke Jr.

Graduate Theses, Dissertations, and Problem Reports (ETD)

The concern for people with disabilities who are users of wheelchairs has become a dynamic research area in the past several years. As part of this research, new and innovative mechanisms that give the manual wheelchair users a mechanical advantage, and allow them to operate a standard wheelchair with less effort and muscle strain are being developed.;An innovative mechanism has been conceived, designed, built, and tested. It allows the user to propel a standard wheelchair in both the push and pull strokes of the handle. This new design will allow for a more symmetric muscle development of the shoulder and …

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Investigation Of Frictional Resistance On Orthodontic Brackets When Subjected To Variable Moments, Edward Mah May 2002

Investigation Of Frictional Resistance On Orthodontic Brackets When Subjected To Variable Moments, Edward Mah

Graduate Theses, Dissertations, and Problem Reports (ETD)

Friction and binding occur in orthodontics during sliding mechanics. This paper evaluated the influence of a variable moment, simulating mastication, placed at the bracket-archwire interface to determine its effects on friction. Friction of self-ligating brackets were also compared to stainless steel and ceramic brackets. Six archwires were combined with four brackets. Friction (static, kinetic and dynamic) and load (dynamic and apparent stiffness) were measured. Dynamic friction was the frictional force that occurred when the applied force was variable (dynamic load). The results showed that static and kinetic friction were similar while dynamic friction was statistically greater. The Minitwin and Transcend …

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Overwintering Abundance And Distribution Of Striped Bass (Morone Saxtilis) In The Hudson River Estuary Using Hydroacoustic Techniques, Brian William Nagy May 2002

Overwintering Abundance And Distribution Of Striped Bass (Morone Saxtilis) In The Hudson River Estuary Using Hydroacoustic Techniques, Brian William Nagy

Graduate Theses, Dissertations, and Problem Reports (ETD)

Using a modification of standard techniques, a target strength to length relationship was developed for white perch (Morone americana) and striped bass (Morone saxtilis). This target strength to length relationship was compared to two standard relationships (Love and Foote). The calculated relationship was not found to be significantly different from Love's equation, but was different from Foote's equation. This calculated relationship was applied to hydroacoustic data collected on the Hudson River in December of 1995 and 1997. The goal of the hydroacoustic data collection was to assess the abundance and distribution of overwintering Hudson River striped bass. Results from this …

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Modulation Of Thiols And Pulmonary Immune Responses Due To Diesel Exhaust Particle (Dep) Exposure, Nabil Hussain Al-Humadi May 2002

Modulation Of Thiols And Pulmonary Immune Responses Due To Diesel Exhaust Particle (Dep) Exposure, Nabil Hussain Al-Humadi

Graduate Theses, Dissertations, and Problem Reports (ETD)

Environmental exposure to diesel exhaust particles (DEP) has been of concern because of its potential contribution to the increased prevalence of acute and chronic airway diseases. The objective of this study was to investigate the role of thiol changes (due to DEP exposure) in immune responses. Rats were exposed to OVA, DEP, or both by intratracheal instillation (IT) and/or inhalation. IT-DEP exposure significantly increased the inflammatory parameters and thiol levels in both Sprague-Dawley and Brown Norway rats. Exposure to DEP and/or OVA resulted in significant increases in neutrophils, LDH, total protein, and albumin content in lavage fluid. Alveolar macrophage (AM) …

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Depression And Self -Silencing In Lesbian And Heterosexual Women, Samantha Ann Kirk May 2002

Depression And Self -Silencing In Lesbian And Heterosexual Women, Samantha Ann Kirk

Graduate Theses, Dissertations, and Problem Reports (ETD)

Depression among lesbians is an underexplored area in the literature of the psychology of women and in depression research. A few investigators have hypothesized about the factors that place lesbians at risk for depression, and have explored those hypotheses experimentally. However, there is a large gap in the understanding of lesbians and depression. Dana Jack (1991) proposed a model of depression which holds that women who fail to represent their experiences to romantic partners are at increased risk for depression. One hundred and seventy participants were recruited to test this model (85 lesbians and 71 heterosexual women, as well as …

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Preparation Of Benzoenyne -Allenes, Enyne -Isocyanates And Enyne -Carbodiimides And Their Applications In The Synthesis Of Polycyclic Aromatic Hydrocarbons And Heterocycles, Hongbin Li May 2002

Preparation Of Benzoenyne -Allenes, Enyne -Isocyanates And Enyne -Carbodiimides And Their Applications In The Synthesis Of Polycyclic Aromatic Hydrocarbons And Heterocycles, Hongbin Li

Graduate Theses, Dissertations, and Problem Reports (ETD)

The thionyl chloride-induced cascade cyclization of enediynyl propargylic alcohols provides an efficient synthetic route to 11H-benzo[ b]fluoren-11-ols and related compounds. The simplicity of the synthetic sequence and the mildness of the reaction condition make this pathway especially attractive. Interestingly, in certain cases the intramolecular [2+2] cycloaddition reaction of the chlorinated benzoenyne-allene intermediates occurred preferentially to form 1H-cyclobut[a]indenes. Competition from the intramolecular [2+2] cycloaddition reaction could be avoided with the non-chlorinated benzoenyne-allenes, providing direct access to novel polycyclic aromatic hydrocarbons. Several indeno-fused 4,5-diarylphenanrenes were synthesized by a consecutive C2-C6 cyclization of a symmetrical benzoenyne-allene. The formal Diels-Alder reaction involving a C2-C6 …

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Effects Of Electronic Communication On Culture Shock Of Spouses Of International Students, Diana Bennett May 2002

Effects Of Electronic Communication On Culture Shock Of Spouses Of International Students, Diana Bennett

Graduate Theses, Dissertations, and Problem Reports (ETD)

Culture shock is a serious problem for spouses of international students. This recollection study looked at use of telephone, web phone, email, chat, and online newspapers as predictors for culture shock. Fifteen spouses of international students at a mid-Atlantic university were interviewed with the same rated questions asking them to recall how they felt: When they first arrived in the United States, during their first six months here, during their second six months here, during their third six months here, and at the time of the interview. For the same time periods, they were also asked how many times a …

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Analysis Of Complex Ventilation Networks In Multiple Fan Coal Mines, Khaled Ali El-Nagdy May 2002

Analysis Of Complex Ventilation Networks In Multiple Fan Coal Mines, Khaled Ali El-Nagdy

Graduate Theses, Dissertations, and Problem Reports (ETD)

Coal mines require very effective and proper ventilation systems not only to keep the levels of explosive, harmful gases and dust to a safe level but also to deliver enough fresh air for miners to breathe. Depending upon the size of the mine and the quantity of gases and dust in this mine, it could be ventilated by using a single fan or several fans. There are two types of fans used in mines: vane axial and centrifugal.;In multiple-fan systems, each individual fan influences the performance of the whole system, including the other fans. Each fan in the system has …

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Combustion Analysis And Particulate Mutagenicity Characterization For A Single-Cylinder Diesel Engine Fueled By Fischer -Tropsch Derived Liquids, Michael Hayden Mcmillian May 2002

Combustion Analysis And Particulate Mutagenicity Characterization For A Single-Cylinder Diesel Engine Fueled By Fischer -Tropsch Derived Liquids, Michael Hayden Mcmillian

Graduate Theses, Dissertations, and Problem Reports (ETD)

Further growth of diesel engines in the light-duty and heavy-duty vehicular markets is closely linked to the potential health risks of diesel exhaust. Cleaner burning fuels, such as those derived from natural gas via the Fischer-Tropsch (FT) process, offer a potentially economically viable alternative to standard diesel fuel. As part of this study, a two-liter, single-cylinder, four-stroke direct-injected engine was instrumented for in-cylinder pressure measurements. The emissions and performance data from engine operation with Federal low sulfur No. 2 diesel fuel (DF) and natural gas derived FT fuel were compared. Also as part of the study, an investigation was carried …

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Perceptions Of Moral Agency Among Some Preschool Special Needs Teachers, Stephen Keith Pavlovic May 2002

Perceptions Of Moral Agency Among Some Preschool Special Needs Teachers, Stephen Keith Pavlovic

Graduate Theses, Dissertations, and Problem Reports (ETD)

For more than 30 years, research on moral development has been dominated by the work of Lawrence Kohlberg and James Rest who have sought to construct and validate a universal model of moral development. The administration of either the Moral Judgment Inventory (MJI) or the Defining Issues Test (DIT) has been the primary, and frequently the only, methodology used to examine the moral reasoning abilities of various professions. Based on these tests, teachers have shown a disturbingly low level of moral reasoning. Using Rest's Four Component Model of moral deliberation, the study was designed to test the hypothesis that teachers' …

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Tone Classification Of Syllable -Segmented Thai Speech Based On Multilayer Perceptron, Nuttavudh Satravaha May 2002

Tone Classification Of Syllable -Segmented Thai Speech Based On Multilayer Perceptron, Nuttavudh Satravaha

Graduate Theses, Dissertations, and Problem Reports (ETD)

Thai is a monosyllabic and tonal language. Thai makes use of tone to convey lexical information about the meaning of a syllable. Thai has five distinctive tones and each tone is well represented by a single F0 contour pattern. In general, a Thai syllable with a different tone has a different lexical meaning. Thus, to completely recognize a spoken Thai syllable, a speech recognition system has not only to recognize a base syllable but also to correctly identify a tone. Hence, tone classification of Thai speech is an essential part of a Thai speech recognition system.;In this study, a tone …

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Explaining Viking Expansion, Darrin M. Cox May 2002

Explaining Viking Expansion, Darrin M. Cox

Graduate Theses, Dissertations, and Problem Reports (ETD)

Current scholarship regarding Scandinavia has neglected to give all but a cursory glance at the factors involved in Viking expansion. This thesis studies and explains employment opportunities, political motives, and societal norms as separate, individual motives that perpetuated Scandinavian migration, conquest, and adventure from the eighth through the eleventh centuries AD. Afterwards, these investigations are used to describe the various and sometimes conflicting forces of expansion that led to the formation of the Danelaw in England circa AD 870. Over time, the eventual adoption of Christianity and feudal relationships within Scandinavia would bring expansion as well as the Viking Age …

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Pulse Charging Lead-Acid Batteries To Improve Performance And Reverse The Effects Of Sulfation, Robert B. Cooper May 2002

Pulse Charging Lead-Acid Batteries To Improve Performance And Reverse The Effects Of Sulfation, Robert B. Cooper

Graduate Theses, Dissertations, and Problem Reports (ETD)

When lead-acid batteries are improperly charged or discharged, useful power delivered to loads diminishes. One cause for this is a phenomenon generally referred to as sulfation. One possible method that has been proposed by many to reverse the effects of sulfation is to recharge the lead-acid battery using a pulse charger. To gain a better understanding of the possible benefits of this type of charging, a pulse charger/discharger was constructed. Cycle testing was then done on six pairs of batteries to compare the pulse charged batteries to conventional full-wave rectifier charged batteries. The results of the tests showed that pulse …

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