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Examining The Efficacy Of Parent -Child Interaction Therapy With High -Functioning Autism, Joshua J. Masse Aug 2009

Examining The Efficacy Of Parent -Child Interaction Therapy With High -Functioning Autism, Joshua J. Masse

Graduate Theses, Dissertations, and Problem Reports (ETD)

Externalizing behaviors are a common component of the clinical presentation of autism spectrum disorders (ASD) and are typically the initial focus of treatment for children within this population. Although a number of therapies targeting behaviors characteristic of ASD exist, most do not offer a short-term, manual-based approach aimed at increasing child compliance. Although traditionally used with typically-developing children, Parent-Child Interaction Therapy (PCIT) is one behaviorally-based, short-term (∼14 sessions) parent training program that has demonstrated success in increasing child compliance, reducing problem behavior, and improving parent-child communication. The study examined the efficacy of PCIT as a first-line treatment for children with …

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Size Dependent Magnetic Properties Of Nickel Nanoparticles Embedded In Silica Matrix, Vivek Singh Aug 2009

Size Dependent Magnetic Properties Of Nickel Nanoparticles Embedded In Silica Matrix, Vivek Singh

Graduate Theses, Dissertations, and Problem Reports (ETD)

In this dissertation, synthesis, structural and magnetic properties of nickel (Ni) nanoparticles (NPs) embedded in amorphous silica matrix are described in detail. These Ni NPs were prepared using the sol-gel technique. The percent composition of x-Ni/SiO2 was varied from 1, 5 and 15%. Further, the samples were annealed in a furnace at temperatures between 400° to 800°C for the duration of 2 hours in a continuous flow of ultra high pure (UHP) nitrogen in order to obtain different particle sizes ranging from 3.8 to 23 nm for the 15% Ni/SiO 2 composition.;Structural characterization of the Ni NPs was done using …

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Creep Rupture And Life Prediction Of Polymer Composites, Saurabh Batra Aug 2009

Creep Rupture And Life Prediction Of Polymer Composites, Saurabh Batra

Graduate Theses, Dissertations, and Problem Reports (ETD)

Lack of long term performance data inhibits the widespread use of composites. The long-term response/performance of composite materials and structures exposed under service conditions (load, time, temperature, water, and others) must be established. Creep response under sustained load results in rupture but the time to rupture depends on environmental conditions. Creep rupture tests at higher fractions of ultimate failure load are often used to determine the time necessary to produce failure. Creep data are generated first in terms of deformation/strain versus time up to rupture for each test under a fraction of rupture load at a given temperature. Then the …

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Predicting The Performance Of Horizontal Wells In Unconventional Gas Reservoirs, Dylan Todd Drinkard Aug 2009

Predicting The Performance Of Horizontal Wells In Unconventional Gas Reservoirs, Dylan Todd Drinkard

Graduate Theses, Dissertations, and Problem Reports (ETD)

Unconventional gas has become an increasingly important component of total U.S. domestic production for the past decade. Currently, only numerical models (simulators) can be used to predict production behavior in unconventional gas reservoirs. Numerical models are expensive and time consuming and the needed variables for evaluations are often unknown or only estimated.;This research has focused on developing a simple, quick, and reliable tool to predict gas production from horizontal wells in the unconventional gas reservoirs. This study presents a set of production type curves for coalbed methane (CBM) reservoirs. A reservoir model that incorporates the unique flow and storage characteristics …

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Characterization Of Exhaust Emissions From Palm Oil-Based And Soybean Oil-Based Biodiesel Fueled Heavy-Duty Transit Buses, Trampas Jay Efaw Aug 2009

Characterization Of Exhaust Emissions From Palm Oil-Based And Soybean Oil-Based Biodiesel Fueled Heavy-Duty Transit Buses, Trampas Jay Efaw

Graduate Theses, Dissertations, and Problem Reports (ETD)

Biodiesel blends offer a renewable energy fueling option for compression-ignition internal combustion engines. Typically, biodiesel blended at or less than 20% (B20), by volume, will exhibit substantial reductions in diesel particulate matter (PM), while not significantly impacting oxides of nitrogen (NO X) emissions. Additionally, operation on biodiesel blended at B20 levels or less has not been associated with substantial fuel economy penalties.;A study was conducted, wherein two transit buses were utilized to quantify the emissions and performance effects associated with the use of biodiesel fuels, derived from palm oil and soybean oil. Evaluation of the two fuels was accomplished through …

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Development And Evaluation Of A Fault Detection And Identification Scheme For The Wvu Yf-22 Uav Using The Artificial Immune System Approach, Sebastian Pablo Sanchez Aug 2009

Development And Evaluation Of A Fault Detection And Identification Scheme For The Wvu Yf-22 Uav Using The Artificial Immune System Approach, Sebastian Pablo Sanchez

Graduate Theses, Dissertations, and Problem Reports (ETD)

A failure detection and identification (FDI) scheme is developed for a small remotely controlled jet aircraft based on the Artificial Immune System (AIS) paradigm. Pilot-in-the-loop flight data are used to develop and test a scheme capable of identifying known and unknown aircraft actuator and sensor failures. Negative selection is used as the main mechanism for self/non-self definition; however, an alternative approach using positive selection to enhance performance is also presented. Tested failures include aileron and stabilator locked at trim and angular rate sensor bias. Hyper-spheres are chosen to represent detectors. Different definitions of distance for the matching rules are applied …

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Phase Equilibrium And Cage Occupancy Calculations Of Carbon Dioxide Hydrates Using Ab Initio Intermolecular Potentials, Srinath Chowdary Velaga Aug 2009

Phase Equilibrium And Cage Occupancy Calculations Of Carbon Dioxide Hydrates Using Ab Initio Intermolecular Potentials, Srinath Chowdary Velaga

Graduate Theses, Dissertations, and Problem Reports (ETD)

Huge deposits of carbon is trapped in the form of methane gas hydrates, these methane gas hydrates represent a potential energy source that could possibly last for thousands of years. Gas hydrate reservoirs are receiving increased attention as potential locations for CO2 sequestration, with CO2 replacing the methane that is recovered as an energy source.;In this scenario it is very important to correctly characterize the cage occupancies of CO2 to correctly assess the sequestration potential as well as the methane recoverability. In order to predict accurate cage occupancies, the guest-host interaction potential must be represented properly. Earlier, these potential parameters …

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The Treatment Of The Monotheistic Religions In World History High School Textbooks: A Comparison Of Sample Editions 2001--2007, Jason Eugene Allen Aug 2009

The Treatment Of The Monotheistic Religions In World History High School Textbooks: A Comparison Of Sample Editions 2001--2007, Jason Eugene Allen

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study examines the treatment of the three most practiced monotheistic religions, Christianity, Islam, and Judaism, within the pages of High School World History Textbooks. The results find that within World History textbooks Christianity and Islam receive more coverage than Judaism in narrative content, word usage, illustrations, and questions presented. Christianity receives the greatest amount of narrative content in all textbooks studied whereas Islam has portrayals that highlight the spiritual aspects of the religion to a greater extent than do Christianity and Judaism. Judaism received the least amount of coverage of the three religions. Very little is presented concerning the …

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An Interpretive Inquiry Of The Case Law Of Teacher Evaluation In The Southern Regional Education Board States: Forecasting Pressing Problems, Kathy S. Kidder-Wilkerson Aug 2009

An Interpretive Inquiry Of The Case Law Of Teacher Evaluation In The Southern Regional Education Board States: Forecasting Pressing Problems, Kathy S. Kidder-Wilkerson

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to analyze case law related to teacher evaluation between 1980 and 2008 in the SREB states to determine the problems associated with teacher evaluation and if these problems were documented in the literature. Content analysis of teacher dismissal cases revealed many types of teacher evaluation problems. The two most frequent were in the categories of process and data. Problems revealed in case law provide evidence that teacher evaluation is a problematic practice and may be prevented from achieving its accountability goal. Since not all problems that were identified in case law were revealed in …

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Factors Associated With International Students' Motivations To Study At West Virginia University, Abimbola Akintounde Aug 2009

Factors Associated With International Students' Motivations To Study At West Virginia University, Abimbola Akintounde

Graduate Theses, Dissertations, and Problem Reports (ETD)

Increasing international student enrollments requires an understanding of international students' motivations for studying abroad. This study sought to identify the factors associated with international students' motivation to study in the United States and particularly at West Virginia University. An internet survey was sent via email to all 1183 international students enrolled at WVU in spring of 2009. A 29.4% response rate (344 students) was achieved. Based on an analysis of responses received, respondents' top motivations for studying at WVU included the United States' reputation for high quality teaching, respect for United States degrees abroad, the global perspective the United States …

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Verbal Time Estimation In Clutterers And Non-Clutterers, Emily O. Garnett Aug 2009

Verbal Time Estimation In Clutterers And Non-Clutterers, Emily O. Garnett

Graduate Theses, Dissertations, and Problem Reports (ETD)

Research has suggested that people with fluency disorders, i.e., individuals who stutter, have difficulty with time estimation. A sub-group of fluency disorders are persons who clutter, whose speech is characterized by a rapid and/or irregular rate of speech that is accompanied by excessive disfluencies, abnormally placed pauses, and/or excessive coarticulation. One frequently reported symptom of cluttering is a lack of awareness of one's own cluttering, which may be related to rate deviations. It is possible that persons who clutter may also lack the awareness of the amount of time required to say something, and thus, demonstrate difficulty estimating the amount …

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Improvement Of The Physical And Nutritional Quality Of Pelleted Feed, Curran Kenji Gehring Aug 2009

Improvement Of The Physical And Nutritional Quality Of Pelleted Feed, Curran Kenji Gehring

Graduate Theses, Dissertations, and Problem Reports (ETD)

Experiments were conducted to improve the physical and nutritional quality of pelleted feed. One experiment focused specifically on improvement of pellet quality using functional muscle proteins. A second experiment examined the effects of increasing mixer-added fat (MAF) on feed manufacture variables, broiler performance variables and carcass composition. In experiment 1, muscle proteins (myofibrillar and sarcoplasmic) were recovered using isoelectric/solubilization precipitation, and a functional paste (TPP) was formed by mixing recovered proteins with typical surimi additives. Trout protein paste was included in broiler diets at 0, 2.5 or 5%. A tap water treatment (3.9%) was included to match the moisture added …

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Coconut Oil Enhancement Of Conjugated Linoleic Acid Induced Body Fat Loss And Lipolysis In Mice, Siri Manasa Ippagunta Aug 2009

Coconut Oil Enhancement Of Conjugated Linoleic Acid Induced Body Fat Loss And Lipolysis In Mice, Siri Manasa Ippagunta

Graduate Theses, Dissertations, and Problem Reports (ETD)

Dietary conjugated linoleic acid (CLA) causes a body fat loss that is enhanced when mice are fed coconut oil (CO) compared to soy oil (SO). The objectives were to determine if CLA feeding altered proteins involved in lipolysis. Male mice (n = 80; 3 wk old) were fed 7% SO or CO diets for 6 wk then 0 or 0.5% CLA for 12d. A body fat index was calculated: (retroperitoneal (RP) + epididymal (EPI) fat pads)*100/body weight. Lipolysis was determined by non-esterified fatty acid (NEFA) and glycerol release from EPI & RP explants. The relative expression of perilipin, phosphorylated perilipin …

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Synthesis Of Semiconductor Nanoparticles And Characterization Of Physical And Optical Properties, Mikala Shremshock Aug 2009

Synthesis Of Semiconductor Nanoparticles And Characterization Of Physical And Optical Properties, Mikala Shremshock

Graduate Theses, Dissertations, and Problem Reports (ETD)

Nanoparticles are of great interest to a broad scientific community. Because of quantum effects, nanoscale materials exhibit many unique properties that may be exploited for biomedical, defense, and energy applications. Extensive synthetic effort is described for II-VI semiconductor materials. The materials were morphologically confined to zero- or one-dimensional structures. The nanoparticles discussed herein present similar chemical, optical, and physical properties to previously synthesized materials; however, the processes used to obtain these particles are more environmentally benign and use safer chemicals for the researcher and the laboratory environment. These nanomaterials have been extensively characterized to ascertain high quality optical, morphological, and …

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The Influence Of Side Vent Length On Instrument Flexural Fatigue Of Three Endodontic Irrigating Needles, Bryant William Stowe Aug 2009

The Influence Of Side Vent Length On Instrument Flexural Fatigue Of Three Endodontic Irrigating Needles, Bryant William Stowe

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this in-vitro study was to compare the influence of the side vent length on flexural fatigue and subsequent failure of three endodontic irrigating needles. Twenty ProRinse Endodontic Irrigation Probes, twenty-three Max-i-Probes, and twenty Vista-Probe Irrigating Tips were used in this study. All three irrigating needles are 30-gauge, have a side-vented port, and are safe-ended. After all side vent lengths were measured and recorded, each needle was subjected to flexing cycles of 30° until flexural fatigue occurred and the instrument permanently failed. Data were analyzed using a one-way ANOVA and Tukey HSD test. Results indicate the Vista-Probe required …

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Effects Of Delayed Fat Supplementation On Post-Prandial Rumen Metabolism, Lamb Quality And Fatty Acid Composition Of Rumen Effluent, Quinn Stephan Baptiste Aug 2009

Effects Of Delayed Fat Supplementation On Post-Prandial Rumen Metabolism, Lamb Quality And Fatty Acid Composition Of Rumen Effluent, Quinn Stephan Baptiste

Graduate Theses, Dissertations, and Problem Reports (ETD)

Sheep farmers have an option to incorporate fat supplements into the ration of grazing ruminants. Farmers choosing this option will have to select a time for offering that supplement. It might be practical to feed the supplement in the morning or evening. However, the time at which that supplement is fed should not compromise nutrient digestion or the enhancement of ruminant product fatty acid composition. Consequently, the effects of feeding a fat enriched supplement, at a delayed time on rumen metabolism, lamb quality, and fatty acid composition of effluent digesta were investigated in three experiments. In experiment 1, treatment (time …

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Nonlinear Dynamics Modulation In A Neon Glow Discharge Plasma, Paul M. Miller Aug 2009

Nonlinear Dynamics Modulation In A Neon Glow Discharge Plasma, Paul M. Miller

Graduate Theses, Dissertations, and Problem Reports (ETD)

In dynamics modulation, two modes in a driven neon glow discharge alternate as the dominant mode as their response to the driving force alternates between spatiotemporal and temporal periodic pulling. This phenomenon was first noted by Koepke, Weltmann, and Selcher (Bull. Am. Phys. Soc. 40, 1716 (1995)), who saw two limited but representative cases and proposed a mechanism (Phys. Rev. E 62, 2773 (2000)) by which it occurs. The intent of this dissertation is to document experimentally and test the dynamics modulation mechanism they proposed. Using a new extension of a previous mathematical treatment of periodic pulling, the resulting experimental …

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Laboratory Observation Of Evolution Of Iedd-Wave-Modified Equilibrium And Density-Gradient Effects On Smia Wave Propagation, Eric W. Reynolds Aug 2009

Laboratory Observation Of Evolution Of Iedd-Wave-Modified Equilibrium And Density-Gradient Effects On Smia Wave Propagation, Eric W. Reynolds

Graduate Theses, Dissertations, and Problem Reports (ETD)

It was previously found that sheared ion-flow alters the dispersion of waves in plasma [Koepke et al., 1994, 1998a]. Many aspects of sheared ion-flow effects were demonstrated for ion-acoustic waves [Teodorescu et al., 2002a], ion-cyclotron waves [ Teodorescu et al., 2002b; Koepke et al., 1999; Amatucci et al., 1998] and drift waves [Kaneko et al., 2003]. This dissertation further investigates ion-cyclotron waves and ion-acoustic waves in the WVU Q machine plasma in the presence of sheared parallel (magnetic-field aligned) ion-flow and further investigates ion-cyclotron waves in the WVU Q machine plasma in the presence of sheared perpendicular ion-flow.;Experiments were performed …

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Transient Flow Characteristics Of A High Speed Rotary Valve, Patrick H. Browning Aug 2009

Transient Flow Characteristics Of A High Speed Rotary Valve, Patrick H. Browning

Graduate Theses, Dissertations, and Problem Reports (ETD)

Pressing economic and environmental concerns related to the performance of fossil fuel burning internal combustion engines have revitalized research in more efficient, cleaner burning combustion methods such as homogeneous charge compression ignition (HCCI). Although many variations of such engines now exist, several limiting factors have restrained the full potential of HCCI. A new method patented by West Virginia University (WVU) called Compression Ignition by Air Injection (CIBAI) may help broaden the range of effective HCCI operation. The CIBAI process is ideally facilitated by operating two synchronized piston-cylinders mounted head-to-head with one of the cylinders filled with a homogeneous mixture of …

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Effects Of Color And Animation On Visual Short -Term Memory In Computer-Environment Learning Tasks, Marc Debiase Aug 2009

Effects Of Color And Animation On Visual Short -Term Memory In Computer-Environment Learning Tasks, Marc Debiase

Graduate Theses, Dissertations, and Problem Reports (ETD)

The goals of this research study were to gain a better understanding of the effects of color and animation on visual short-term memory (STM) in computer-environment learning tasks. The research methodology was based on an investigative design that attempted to address weaknesses of previous visual STM research (Klauer & Zhao, 2004) to provide information readily applicable to instructional design and technology. A 3 x 2 x 3 totally-within participants, repeated-measures Factorial Analysis of Variance (ANOVA) design was utilized to investigate limitations on visual short-term memory learning processes in computer-learning environments. Participant scores for accuracy of visual learning tasks and participant …

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Modeling Issues For Solid Oxide Fuel Cells Operating With Coal Syngas, Francisco Elizalde-Blancas Aug 2009

Modeling Issues For Solid Oxide Fuel Cells Operating With Coal Syngas, Francisco Elizalde-Blancas

Graduate Theses, Dissertations, and Problem Reports (ETD)

Fuel cells which directly convert the chemical energy into electricity are considered one of the most promising technologies to support energy needs in the near future. Solid Oxide Fuel Cells (SOFC) can run with alternative fuels such as synthesis coal gas due to their high operating temperature. Utilization of coal syngas in fuel cells would enable cleaner coal energy. A better understanding of the chemical and transport processes when running on syngas will allow researchers to find solutions to problems currently delaying the introduction of the technology into the market. A comprehensive modeling tool is developed for simulation of SOFCs …

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Rapid Characterization Of Biomass: The Use Of Near Infrared And Fluorescence Spectroscopy As Process Analytical Technology (Pat) Method, Kofi Nkansah Aug 2009

Rapid Characterization Of Biomass: The Use Of Near Infrared And Fluorescence Spectroscopy As Process Analytical Technology (Pat) Method, Kofi Nkansah

Graduate Theses, Dissertations, and Problem Reports (ETD)

The heterogeneous property of biomass (wood) affects its potential of being converted into any form of fuel in different ways (both positive and negative effects). Therefore in other to efficiently utilized biomass as a raw material for conversion into any form of clean alternative fuel to displace some of the fossil fuel we consume in the United State on a commercial scale basis, a quick, robust, non destructive on/in/at-line method of characterizing the physical and chemical properties of biomass that are relevant to the bio-refinery industry is imperative.;This study discusses the potential of using near infrared spectroscopy (NIRS) and fluorescence …

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Recycling Veneer-Mill Residues Into Engineered Products With Improved Torsional Rigidity, Brad Mcgraw Aug 2009

Recycling Veneer-Mill Residues Into Engineered Products With Improved Torsional Rigidity, Brad Mcgraw

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this research was to recycle veneer-mill residues from underutilized hardwood species into a value-added composite. These residues come from high quality logs and currently, are treated as waste. This study included the development of production methods of this new product. Using standard ASTM testing methods, an assessment into the physical and mechanical properties of the composite was performed.;The intended end use of these panels is as a web material in prefabricated I-joists. Composite I-joists were produced using flanges of structural composite lumber and a corrugated web. The purpose of the corrugated web was to increase the buckling …

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Agenda Setting And Presidential Power In The United States, Paul E. Rutledge Aug 2009

Agenda Setting And Presidential Power In The United States, Paul E. Rutledge

Graduate Theses, Dissertations, and Problem Reports (ETD)

Richard Neustadt (1960) started a revolution of sorts for future scholars examining the American presidency. It was Neustadt who introduced the notion of a personal president, holding personal power and acting in ways that had implications beyond those powers formally granted to the president in the Constitution. Starting with the presidency of Franklin Roosevelt, the public has looked to the president to be assertive, energetic, and solve problems. Roosevelt offered a New Deal with the American people, and was the first president to really reach into the homes of America. Now the presidency is a public presidency, subjected to very …

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Assessing The Variation Of Driver Distraction With Experience, Nagaanupama Akuraju Aug 2009

Assessing The Variation Of Driver Distraction With Experience, Nagaanupama Akuraju

Graduate Theses, Dissertations, and Problem Reports (ETD)

Driver distraction has been a major concern in highway safety. Driver distraction is related to crashes and crash rate varies with age. Driving experience obviously increases with age. The purpose of this study is to determine the relation between driver experience and distraction. The study measures the distraction levels of various drivers and assesses the variation in distraction based on experience and also gender.;Distraction was defined as looking away from the center of the roadway for more than 2 seconds. Factors like distraction duration, percent time spent looking at the center of roadway and number of glances away from the …

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Investigation Into Pedestrian Exposure To Near-Tailpipe Exhaust Emissions, Neil A. Buzzard Aug 2009

Investigation Into Pedestrian Exposure To Near-Tailpipe Exhaust Emissions, Neil A. Buzzard

Graduate Theses, Dissertations, and Problem Reports (ETD)

Inhalation of particulate matter is known to cause negative human health effects. Consequently, regulatory agencies have set regulations and standards that limit the maximum concentrations to which persons may be exposed and the maximum concentrations allowed in the ambient air. However, these standards consider steady exposure over large spatial and time scales. Because many vehicles' exhaust systems direct exhaust towards sidewalks, pedestrians in close proximity to a roadway may experience events where for brief periods of time particulate matter concentrations are high enough to cause acute health effects. In order to quantify these exposure events, instruments which measure specific exhaust …

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Development Of Computational Tools For Modeling Engine Fuel Economy And Emissions, Christopher L. Marlowe Aug 2009

Development Of Computational Tools For Modeling Engine Fuel Economy And Emissions, Christopher L. Marlowe

Graduate Theses, Dissertations, and Problem Reports (ETD)

The Integrated Bus Information System (IBIS) is a vehicle fleet emission and fuel economy prediction software. IBIS is under development by faculty and students of West Virginia University (WVU). The overall goal of IBIS is to provide an approachable and reliable method for users, primarily transit agencies, to evaluate overall fleet emissions and fuel consumption. This approach differs from current modeling packages as IBIS is an online tool and allows for a customizable, user-defined vehicle fleet.;The modeling strategy for IBIS involves creating models using data obtained from the WVU Center for Alternative Fuels, Engines, and Emissions (CAFEE) testing database. These …

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Stay Or Leave? The Effects Of Communicative Infidelity On Relationship Outcomes, Colleen C. Malachowski Aug 2009

Stay Or Leave? The Effects Of Communicative Infidelity On Relationship Outcomes, Colleen C. Malachowski

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to examine the effects of communicative infidelity (CI) motives on relationship outcomes. CI motives include jealousy, vengefulness, sexual self-esteem, sexual depression, and sexual preoccupation, while outcomes included forgiveness, reparation, voice, exit, loyalty, and neglect responses. Additionally, this study tested the relationship of commitment and satisfaction to relational outcomes. Participants were 215 undergraduate students currently involved in a romantic relationship. Participants were instructed to answer questions measuring their commitment and satisfaction levels, as well as read and respond to a CI scenario. Results indicated that commitment is positively related to voice responses and negatively related …

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Development Of A Soccer Specific Functional Rehabilitation Program Using The Modified Delphi Technique, Sarah R. Leslie May 2009

Development Of A Soccer Specific Functional Rehabilitation Program Using The Modified Delphi Technique, Sarah R. Leslie

Graduate Theses, Dissertations, and Problem Reports (ETD)

Context. There are no concise and thorough core and lower quarter exercises for functional rehabilitation found in the literature or the clinical setting for soccer. An exercise program is needed to assist clinicians in developing sport specific functional rehabilitation programs. Objective. The purpose of this study was to develop a concise soccer specific functional rehabilitation program. Design. This was a prospective descriptive study following the Modified Delphi Technique to develop exercise components to include in a functional rehabilitation program based on opinion from a panel of experts. The dependent variable was the responses ranging from strongly agree to strongly disagree. …

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Circulation Control Improvements To Rotor Lift Asymmetry Due To Reverse Flow, Michael J. Lyons May 2009

Circulation Control Improvements To Rotor Lift Asymmetry Due To Reverse Flow, Michael J. Lyons

Graduate Theses, Dissertations, and Problem Reports (ETD)

Circulation control has been applied to airfoils since the late 1960's, and has been proven to change the aerodynamic performance by altering the interaction of the streamlines without changing the physical characteristics of the airfoil itself. This has many applications in fluid dynamics; the focus of this application is for the replacement of the conventional helicopter rotor blade system with a fly-by-wire, active circulation controlled system. Conventional helicopters use a swashplate and a series of mechanical linkages, bearings, and dampers to create a fully articulated rotor hub system. This system is required to achieve the blade characteristics required for stable …

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