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Correlating Simulated Surface Marks With Near-Surface Tornado Structure, Michael I. Zimmerman
Correlating Simulated Surface Marks With Near-Surface Tornado Structure, Michael I. Zimmerman
Graduate Theses, Dissertations, and Problem Reports (ETD)
Tornadoes often leave behind patterns of debris deposition, or "surface marks", which provide a direct signature of their near surface winds. The intent of this thesis is to investigate what can be learned about near-surface tornado structure and intensity through the properties of surface marks generated by simulated, debris-laden tornadoes. Earlier work showed through numerical simulations that the tornado's structure and intensity is highly sensitive to properties of the near-surface flow and can change rapidly in time for some conditions. The strongest winds often occur within tens of meters of the surface where the threat to human life and property …
Simulation-Based Optimum Design Of Sensor Arrays Using Multi-Objective Tabu Search, Zongyu Geng
Simulation-Based Optimum Design Of Sensor Arrays Using Multi-Objective Tabu Search, Zongyu Geng
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis is concerned with the optimum design of sensor arrays (i.e., electronic noses or tongues) using simulation experiments. The proposed design method adopts a set of new criteria, which more adequately represent the desirable properties of a sensor array in practice. A number of best non-dominated array designs are selected through a multiple objective (criteria) Tabu search algorithm. The evaluation of a candidate sensor array is based on its multivariate calibration model, which is efficiently estimated from well-designed simulation experiments. The method can be used to optimize the design of both linear and nonlinear sensor arrays.
Cfd Applications In Airship Design, Kevin Shields
Cfd Applications In Airship Design, Kevin Shields
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis examines the aerodynamic characteristics and flight dynamics of a lighter-than-air airship using analytical and computational fluid dynamics (CFD). Modern airships have frequently been proposed for military operations; one of which, designated YEZ-2A, was a prototype whose design was initiated during the 1980's. Designs were evaluated through the wind tunnel tests of a 1:75 scaled model performed by Gomes. His tests relied on surface roughening techniques to compensate for the inability to maintain Reynolds number similarity among scales.;Later, the scaled prototype would receive further attention during a CFD study at WVU. This study was undertaken to numerically simulate the …
Hardware, Software, And Low-Level Control Scheme Development For A Real-Time Autonomous Rover, Brenton K. Wilburn
Hardware, Software, And Low-Level Control Scheme Development For A Real-Time Autonomous Rover, Brenton K. Wilburn
Graduate Theses, Dissertations, and Problem Reports (ETD)
The objective of this research is to develop a low-cost autonomous rover platform for experiments in autonomous navigation. This thesis describes the design, development, and testing of an autonomous rover platform, based on the commercial, off-the-shelf Tamiya TXT-1 radio controlled vehicle. This vehicle is outfitted with an onboard computer based on the Mini-ITX architecture and an array of sensors for localization and obstacle avoidance, and programmed with Matlab/SimulinkRTM Real-Time Workshop (RTW) utilizing the Linux Real-Time Application Interface (RTAI) operating system.;First, a kinematic model is developed and verified for the rover. Then a proportional-integral-derivative (PID) feedback controller is developed for translational …
Evaluation Of Ultrafine Spiral Concentrators For Coal Cleaning, Meng Yang
Evaluation Of Ultrafine Spiral Concentrators For Coal Cleaning, Meng Yang
Graduate Theses, Dissertations, and Problem Reports (ETD)
Although froth flotation methods are the major processes being used in treating ultrafine coal in coal preparation plant, the processes might require large quantities of frother and collectors. The usage of reagents not only might increase the operating costs, but also cause environment concerns. 4+3 short turns two-staged spiral concentrator has been developed, applied in ultrafine coal cleaning circuit, and operated at a lower flowrate than that of spiral used in fine coal cleaning circuit. Ultrafine spiral concentrator is a specific gravity-based separator. It might be gradually accepted in ultrafine coal cleaning circuit as an alternative to froth flotation methods …
Electro-Active Liquid Crystal Dispersed Composites, Sarah E. Smith
Electro-Active Liquid Crystal Dispersed Composites, Sarah E. Smith
Graduate Theses, Dissertations, and Problem Reports (ETD)
In this thesis, the movement of anisotropic liquid crystal polymer rods in dispersion fluids of silicon oils was investigated. The rods demonstrated movement by an applied external AC field. The polymer rods used were 200 nm in diameter and 60 mum in length produced using the template synthesis technique originally adopted by Shafran (2008). A reactive liquid crystal monomer was polymerized by ultraviolet light while the liquid crystal remained in the nematic temperature range. This curing permanently fixes the liquid crystal molecules, producing polymer rods independent of temperature. The rods were dispersed in silicon oils of viscosities 4.7, 9.2, and …
Leaching Of Chalcopyrite With Sodium Hypochlorite, Ravinder Kumar Garlapalli
Leaching Of Chalcopyrite With Sodium Hypochlorite, Ravinder Kumar Garlapalli
Graduate Theses, Dissertations, and Problem Reports (ETD)
Chalcopyrite is the most important copper mineral source and also a refractory mineral for leaching. Several processing routes have been proposed to overcome the environmental problems related to copper extraction from chalcopyrite. In this study, the leaching of chalcopyrite has been investigated with a new reagent sodium hypochlorite (NaOCl). Experiments were carried out in two stages: conversion of chalcopyrite to cupric oxide with NaOCl solution in the first stage, followed by dissolution of the cupric oxide to cupric ion with 1 normal sulfuric acid at room temperature in the second stage. In the first stage leaching, the initial pH varied …
The Impacts Of Longwall Mining On Groundwater Systems -- A Case Of Cumberland Mine Panels B5 And B6, Xinzhi Du
The Impacts Of Longwall Mining On Groundwater Systems -- A Case Of Cumberland Mine Panels B5 And B6, Xinzhi Du
Graduate Theses, Dissertations, and Problem Reports (ETD)
The longwall mining method is a commonly used method of coal extraction that involves the complete removal of large, rectangular panels of coal. Since it causes subsidence through the overlying strata to the ground surface, the surface-and ground-water above the longwall panels may be affected and drained into the lower levels. The purpose of this study is to determine the effects of longwall mining subsidence on surface- and ground-water systems by using a groundwater flow model: Ground Water Vista (GWV).;To setup the GWV model, the Globe Information System software (ArcMap) was used to determine the geometry and boundary conditions of …
Relationships Of Developmental Traits In Young Alpaca Crias And Lambs, Sara Elizabeth Lewis
Relationships Of Developmental Traits In Young Alpaca Crias And Lambs, Sara Elizabeth Lewis
Graduate Theses, Dissertations, and Problem Reports (ETD)
Successful reproduction in alpacas is highly dependent upon postnatal survival, which in turn is dependent upon a pattern of continuous gain in weight as an indicator of health. Weighing alpacas is the primary method used to assess their general health. Unfortunately, the measurement of cria weight is not always a simple, routine, or easy determination. The purpose of this study was to determine if, as in other species such as cattle and horses, morphometric body measurements can be used to estimate weight. In this study, continuous weight and girth measurements were taken on 34 alpaca cria. Age and girth were …
A Reconfigurable Distributed Multiagent System Optimized For Scalability, Summiya Moheuddin
A Reconfigurable Distributed Multiagent System Optimized For Scalability, Summiya Moheuddin
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis proposes a novel solution for optimizing the size and communication overhead of a distributed multiagent system without compromising the performance. The proposed approach addresses the challenges of scalability especially when the multiagent system is large. A modified spectral clustering technique is used to partition a large network into logically related clusters. Agents are assigned to monitor dedicated clusters rather than monitor each device or node. The proposed scalable multiagent system is implemented using JADE (Java Agent Development Environment) for a large power system. The performance of the proposed topology-independent decentralized multiagent system and the scalable multiagent system is …
Hydroclimate Reconstructions Of The Potomac River Basin Using Tree Rings, Richard Stockton Maxwell
Hydroclimate Reconstructions Of The Potomac River Basin Using Tree Rings, Richard Stockton Maxwell
Graduate Theses, Dissertations, and Problem Reports (ETD)
The following dissertation is composed of three separate manuscripts with the overall theme of hydroclimate reconstructions of the Potomac River Basin. The first manuscript investigated two methods of crossdating eastern redcedar (Juniperus virginiana L.) and examined the dendroclimatic response of earlywood, latewood, and total ring-width. In the second manuscript, May precipitation for West Virginia Climate Region 6 was reconstructed using two millennial-length eastern redcedar chronologies from 750-1998. Comparisons were made to other paleoclimate proxy records of moisture in the Mid-Atlantic Region. The final manuscript focused on a multi-species reconstruction of Potomac River streamflow from 950-2001. In this manuscript, species importance …
Phase Transition Problems Of Conservation Laws, Chunguang Chen
Phase Transition Problems Of Conservation Laws, Chunguang Chen
Graduate Theses, Dissertations, and Problem Reports (ETD)
In this thesis we study phase transition problems of conservation laws. Phase transition problems arise from various applications such as gas dynamics, mechanics and material science. Conservation laws involving phase change is an attractive field in applied mathematics. Solutions to phase transition problems are complicated for the presence of boundaries between different phases. In addition to entropy condition, criteria such as kinetic relation [1, 3] and nucleation criterion are introduced to determine the configurations of solutions.;In Chapter 1, we construct two numerical procedures to solve the Riemann problems for a system of conservation laws with phase change. We first find …
Performance And Economics Of Methane Hydrate Reservoirs, Lavanya Nyayapathi
Performance And Economics Of Methane Hydrate Reservoirs, Lavanya Nyayapathi
Graduate Theses, Dissertations, and Problem Reports (ETD)
In order to address the world's growing energy demand, the necessity to explore more and more unconventional sources of energy arises. Recently there has been increased interest in the potential of natural gas hydrates as an alternate energy resource. Hydrates are distributed worldwide and have a high energy density in that 1 m3 of methane hydrates can release as much as 164 m3 of gas.;Hydrates were studied as a laboratory curiosity until and then naturally occurring hydrates were discovered in 1934 clogging gas and oil pipelines. The first naturally occurring hydrate deposits were suggested in 1965 by Makogon in Russia. …
Text, Graphics, And Multimedia Materials Employed In Learning A Computer-Based Procedural Task, Kari Christine Carlson Coffindaffer
Text, Graphics, And Multimedia Materials Employed In Learning A Computer-Based Procedural Task, Kari Christine Carlson Coffindaffer
Graduate Theses, Dissertations, and Problem Reports (ETD)
The present research study investigated the interaction of graphic design students with different forms of software training materials. Four versions of the procedural task instructions were developed (A) Traditional Textbook with Still Images, (B) Modified Text with Integrated Still Images, (C) Onscreen Modified Text with Silent Onscreen Video and (D) Onscreen Narrated Video for four computer tasks. Two research questions guided the study: Research Question 1: Are there any significant differences in student learning of a computer-based procedural task due to the format of the training materials? Research Question 2: Do individual differences in prior knowledge and spatial abilities make …
Improving The Academic Self-Efficacy Of Middle School Girls Toward The Study Of Mathematics Through The Use Of Theatrical Infusion, Aimee L. Richards
Improving The Academic Self-Efficacy Of Middle School Girls Toward The Study Of Mathematics Through The Use Of Theatrical Infusion, Aimee L. Richards
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to determine the impact of theatrical infusion on the academic self-efficacy toward the study of mathematics in middle school girls. A group of middle school girls participated in a program entitled Starring...Math. This five session program presented mathematical concepts through the use of theatrical infusion. The group of participants was composed of twenty-one girls in sixth, seventh and eighth grades.;Part I: Everyday Math Tasks of the Mathematics Self-Efficacy Scale (Betz & Hackett, 1989) was administered at three occasions: (1) prior to the start of the program, (2) at the end of the program and, …
Preventing Solidification Defects In Large Superalloy Castings Used In Advanced Electric Power Systems, Jairo Antonio Valdes Ortiz
Preventing Solidification Defects In Large Superalloy Castings Used In Advanced Electric Power Systems, Jairo Antonio Valdes Ortiz
Graduate Theses, Dissertations, and Problem Reports (ETD)
The need for clean and affordable power has resulted in great demand for high-efficiency gas turbine power systems. To improve energy generation efficiency, and lower CO2 emissions, the new generation of land based gas turbines needs to be larger and operated at a higher temperature. Consequently, it is required the use of Nb-containing superalloys such as Inconel 718 for the rotor disk, to avoid overaging of the microstructure during the forging process, but its applicability is being limited by difficulties in the reliable production of large Vacuum Arc Remelting (VAR) ingots (33 to ∼35 in. diameter) without macrosegregation defects such …
Real-Time Implementation Of A Sensor Validation Scheme For A Heavy-Duty Diesel Engine, Manoharan Thiagarajan
Real-Time Implementation Of A Sensor Validation Scheme For A Heavy-Duty Diesel Engine, Manoharan Thiagarajan
Graduate Theses, Dissertations, and Problem Reports (ETD)
With ultra-low exhaust emissions standards, heavy-duty diesel engines (HDDEs) are dependent upon a myriad of sensors to optimize power output and exhaust emissions. Apart from acquiring and processing sensor signals, engine control modules should also have capabilities to report and compensate for sensors that have failed. The global objective of this research was to develop strategies to enable HDDEs to maintain nominal in-use performance during periods of sensor failures. Specifically, the work explored the creation of a sensor validation scheme to detect, isolate, and accommodate sensor failures in HDDEs. The scheme not only offers onboard diagnostic (OBD) capabilities, but also …
Changes In Throwing Pattern And Perceptual Judgment As The Function Of Task Variations For Young Children, Yoojin Choi
Changes In Throwing Pattern And Perceptual Judgment As The Function Of Task Variations For Young Children, Yoojin Choi
Graduate Theses, Dissertations, and Problem Reports (ETD)
Ecological Task Analysis (ETA; Davis & Burton, 1991) hypothesizes that movement change may emerge from dynamic interaction in given environmental conditions. In other words, task variability provides opportunities for the performer to choose skills suitable to his or her capabilities in order to achieve a task goal.;The purpose of the present study is to examine 4 year-old children's changes in throwing patterns and perceptual judgment as a function of task variation in specific throwing tasks. Each experiment identifies various task parameters (e.g., force, trajectory of throws) and attempts to adjust them to meet a task goal.;The modifications of tasks include …
Goal Framing Of Health Related Behaviors: What Factors Contribute To The Persuasiveness Of A Message?, Sarah A. Stoner
Goal Framing Of Health Related Behaviors: What Factors Contribute To The Persuasiveness Of A Message?, Sarah A. Stoner
Graduate Theses, Dissertations, and Problem Reports (ETD)
There is evidence that the manner in which relevant information is framed can influence decisions that are based on that information. That is, information may be presented in a positive frame (i.e., describing benefits gained from engaging in behaviors) or in a negative frame (i.e., describing losses from not engaging in behaviors). The effect of information frame on older adults' decision to comply or not comply with health behavior recommendations is unclear due to a paucity of research. In an attempt to understand factors that influence older adult healthy behavior decision making, the current study examined variables that might predict …
The Design Of An Evolutionary Algorithm For Artificial Immune System Based Failure Detector Generation And Optimization, Jennifer N. Davis
The Design Of An Evolutionary Algorithm For Artificial Immune System Based Failure Detector Generation And Optimization, Jennifer N. Davis
Graduate Theses, Dissertations, and Problem Reports (ETD)
The development of an evolutionary algorithm and accompanying software for the generation and optimization of artificial immune system-based failure detectors is presented in this thesis. These detectors use the Artificial Immune System-based negative selection strategy. The utility is a part of an integrated set of methodologies for the detection, identification, and evaluation of a wide variety of aircraft sub-system abnormal conditions. The evolutionary algorithm and accompanying software discussed in this document is concerned with the creation, optimization, and testing of failure detectors based on the negative selection strategy. A preliminary phase consists of processing data from flight tests for "self" …
Getting Down To Business: An Efl Curriculum Design For The Business Setting, Gabriel Brito Amorim
Getting Down To Business: An Efl Curriculum Design For The Business Setting, Gabriel Brito Amorim
Graduate Theses, Dissertations, and Problem Reports (ETD)
In today's world of international commerce and technology-driven communication, the exchange of information across countries and cultures has become crucial to creating a global citizenry. After World War II, efforts to create a global commercial market resulted in the promotion of communication across cultures. The purpose of this thesis is to outline a theoretical rationale for a beginner English for Specific Purposes (ESP) curriculum in a foreign setting (Brazil). The curriculum consists of four courses organized around three pillars: (a) the production of spontaneous contextualized communication in the target language, (b) the development of cultural competence specific to the business …
Microfluidic Interfaces For Coupling Hydrodynamic To Electrokinetic Flow And Microchannel Electrophoresis To Electrospray Ionization-Mass Spectrometry, Brent R. Reschke
Microfluidic Interfaces For Coupling Hydrodynamic To Electrokinetic Flow And Microchannel Electrophoresis To Electrospray Ionization-Mass Spectrometry, Brent R. Reschke
Graduate Theses, Dissertations, and Problem Reports (ETD)
Presented in this dissertation is a microfluidic interface for coupling hydrodynamic and electrokinetic flows, this interface was first studied theoretically and then experimentally to evaluate the electrophoretic extraction of a negatively charged analyte from a perpendicular hydrodynamic flow stream. Secondly the interface was used to perform the simultaneous extraction and separation of a cationic peptide and anionic proteins with low electroosmotic flow.;In addition, two important aspects of creating a microfluidic device to couple microchannel electrophoresis with mass spectrometry using electrospray ionization were also studied. These aspects included the electrospray emitter from which the electrospray originates and the incorporation of the …
Durability Prediction Of Structural Composites Through A Continuum Damage Mechanics Approach, Hermann E. Alcazar
Durability Prediction Of Structural Composites Through A Continuum Damage Mechanics Approach, Hermann E. Alcazar
Graduate Theses, Dissertations, and Problem Reports (ETD)
The main objective of this research is to develop and implement a new analytical model that relies on a continuum-damage-mechanics approach to predict the evolution of plastic strain and mechanical damage until failure in a unidirectional fiber reinforced composite. The term "damage" is used only in the context of failure mechanisms associated with fracture, which are commonly associated with degradation in stiffness. Plastic and damage evolution are related to typical failure mechanisms in composite materials such as fiber, inter-fiber, and intra-fiber fracture.;The plastic strain surface is defined based on the Tsai-Wu failure criterion, while the stiffness degradation damage surface is …
Virtual Programs And Their Impact On Appalachian Ohio High Schools, Wendy Hanasky
Virtual Programs And Their Impact On Appalachian Ohio High Schools, Wendy Hanasky
Graduate Theses, Dissertations, and Problem Reports (ETD)
Online learning has grown so much in recent years that researchers have struggled to keep up with its evolution. Practitioners are interested not only in how many schools are using online courses, but also how these courses are being delivered and how programs are being implemented.;The purpose of this exploratory study was to examine the impact of virtual programs on Appalachian Ohio school districts including: which Appalachian Ohio High Schools are using virtual programs, what programs are being used, and why these programs are in place. Rural school districts have added hardships because they are usually limited in course offerings …
Designing A Face Detection Captcha, Adam C. Day
Designing A Face Detection Captcha, Adam C. Day
Graduate Theses, Dissertations, and Problem Reports (ETD)
Completely Automated Tests for Telling Computers and Humans Apart (CAPTCHAs) are quickly becoming a standard for security in every online interface that could be the subject to spam or other exploitation. The majority of today's CAPTCHA technologies rely on text-based images, which present the user with a string of distorted characters and asks the user to type out the characters. The problem with CAPTCHAs is that they are often difficult to solve and can generally be successfully defeated using techniques such as segmentation and optical character recognition. We introduce an image face recognition based CAPTCHA which presents the user with …
Utilization Of The Seven Principles For Good Practice In Undergraduate Education In General Chemistry By Community College Instructors, Jennifer Panther Bishoff
Utilization Of The Seven Principles For Good Practice In Undergraduate Education In General Chemistry By Community College Instructors, Jennifer Panther Bishoff
Graduate Theses, Dissertations, and Problem Reports (ETD)
In recent years, higher education has undergone many changes. The advent of assessment, accountability, and a newfound focus on teaching have required faculty to examine how they are teaching. Administrators and faculty are beginning to recognize that learning is not a "one size fits all" enterprise. To this end, Chickering and Gamson developed an inventory that examined faculty utilization of the Seven Principles of Good Practice in Undergraduate Education. The seven principles included by the authors included faculty-student interaction, cooperative learning, active learning, giving prompt feedback, emphasizing time on task, communicating high expectations, and respecting diverse talents and ways of …
The Effect Of Ice Crystal Shape On Aircraft Contrails, Omar E. Meza Castillo
The Effect Of Ice Crystal Shape On Aircraft Contrails, Omar E. Meza Castillo
Graduate Theses, Dissertations, and Problem Reports (ETD)
Aircraft contrails are a common phenomenon observed in the sky. They are formed mainly of water, from the ambient atmosphere and as a by-product of the combustion process, in the form of ice crystals. They have been identified as a potential contributor to global warming. Some contrails can be long-lived and create man-made cloud cover, thus possibly altering the radiative balance of the earth. There has been a great deal of research on various aspects of contrail development, but to date, little has been done on the influence of ice crystal shapes on the contrail evolution. In-situ studies have reported …
Language Learning In Three Early Childhood Programs In Austria, Germany And The United States, Sandra Schoder
Language Learning In Three Early Childhood Programs In Austria, Germany And The United States, Sandra Schoder
Graduate Theses, Dissertations, and Problem Reports (ETD)
In 2002 the European Union declared multilingualism and life-long language learning to be two goals that it will pursue for its citizens. As a result, member states have introduced language learning at the elementary school level, and have shown an ever increasing interest in implementing second language programs designed specifically for children under the age of seven. This is a welcome change for European educators who are already working in early childhood language programs or who plan to establish new programs and have been looking for support for their endeavors. Yet despite recent progress, scholarly research into this arena remains …
The Stability Of The Wala Ridge As A Landmark For Determining Dental Arch Form, Kolin E. Weaver
The Stability Of The Wala Ridge As A Landmark For Determining Dental Arch Form, Kolin E. Weaver
Graduate Theses, Dissertations, and Problem Reports (ETD)
Objectives. To evaluate changes to the WALA Ridge when subjected to orthodontic treatment using customized WALA Ridge archwires and preformed archwires, and ascertain trends within the United States amongst practicing orthodontists regarding arch form selection. Methods. 10 control subjects, 20 customized archwire subjects, and 20 preformed archwire subjects were compared using pre and post treatment mandibular casts for the experimental groups and two timepoint mandibular casts with two years between collection for the control group. Dental and Dentoalveolar changes were then measured from T1 to T2 for each of the groups. Furthermore, an electronic survey was distributed to all active …
Further Hydrogeologic Investigations In The Davis Spring Drainage Basin, Greenbrier County, West Virginia, John Kazimierz Tudek Jr.
Further Hydrogeologic Investigations In The Davis Spring Drainage Basin, Greenbrier County, West Virginia, John Kazimierz Tudek Jr.
Graduate Theses, Dissertations, and Problem Reports (ETD)
An 11 month investigation was undertaken to determine the nature of the flow system feeding Davis Spring. Davis Spring was monitored for stage, temperature and conductivity. Milligan Creek, a major infeeder to the system was also monitored. Quantitative and qualitative dye traces were performed to establish travel times through the system as well as further define drainage basin boundaries.;From tracer analysis, storm pulse travel time analysis and hydrograph peak analysis Davis Spring was determined to be an open flow conduit during most of the year. Exceptions may occur during the winter-spring when intense rain and meltwater may fill the system. …