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Semi-Automated Modeling Approaches To Route Selection In Gis, Binfei Chen
Semi-Automated Modeling Approaches To Route Selection In Gis, Binfei Chen
Graduate Theses, Dissertations, and Problem Reports (ETD)
As an alternative to traditional graphical intuitive approaches (GIA), a semi-automated modeling approach (SMA) can more efficiently identify linear routes by using powerful iterative and automated methods. In this research, two case studies were investigated to examine critical issues relating to the accuracy and effectiveness of raster-defined algorithmic approaches to linear route location. The results illustrate that different shortest-path algorithms do not necessarily result in markedly different linear routes. However, differing results can occur when using different neighboring-cell links in the cell-based route network construction. Cell-based algorithmic approaches in both Arc/Info and IDRISI software generate very similar results which are …
Interoperable Components Across Multiple Component Architectures, Ravi S. Banda
Interoperable Components Across Multiple Component Architectures, Ravi S. Banda
Graduate Theses, Dissertations, and Problem Reports (ETD)
A component is a pre-fabricated, pre-tested software object that provides clients with a well-defined set of services. Component software requires an architecture through which any developer or vendor can deliver a component at any time and have that component become immediately useful to applications on any given system. A system that supports component software must therefore support a generic service abstraction that is, an architecture that defines how all types of components appear and how they are manipulated. As part of the thesis various component architectures COM, JavaBeans and CORBA have been studied and the interoperability issues between the components …
Droplet Coalescence In The Shear Flow Of Model Emulsions, Adam Abdallah Al-Mulla
Droplet Coalescence In The Shear Flow Of Model Emulsions, Adam Abdallah Al-Mulla
Graduate Theses, Dissertations, and Problem Reports (ETD)
During the flow of an emulsion, droplets of the dispersed phase can deform, breakup, coalesce or migrate to other regions within the flow field. Understanding these different processes, both individually and jointly, is relevant, for example, to the development of morphology in immiscible liquid-liquid systems such as polymer blends formulated using single screw or twin screw extruders. While deformation and breakup have been well researched for single drops, migration occurs only for concentrated emulsions. In this study, dilute emulsions of silicone oil and castor oil were employed to observe drop coalescence in the absence of drop breakup; flow fields utilized …
Real-Time Multimedia-Based Education Through The Internet, Abhay Arun Bakshi
Real-Time Multimedia-Based Education Through The Internet, Abhay Arun Bakshi
Graduate Theses, Dissertations, and Problem Reports (ETD)
The rapid advances in computer and communications technologies are challenging the American education systems to provide increased educational opportunities beyond the traditional geographic boundaries at a reasonable cost. Many educational institutions are answering this challenge by developing distance education programs. Distance education provides effective learning environment. An important requirement for effective distance education is the availability of continuous interactivity and immediate feedback. Over the Internet, synchronous sharing of multimedia content introduces unacceptable delays as network bandwidth is limited. In this thesis, the issue of Internet bandwidth is minimized and a novel system is developed for distance education using multimedia course …
Computational Modeling Of Brittle Impact Erosion Mechanisms, Shanmuga Sundaram Balasubramaniyam
Computational Modeling Of Brittle Impact Erosion Mechanisms, Shanmuga Sundaram Balasubramaniyam
Graduate Theses, Dissertations, and Problem Reports (ETD)
Materials are subjected to an erosion-corrosion environment in a wide range of applications today. Elevated temperatures promote the formation of oxide layers in jet engines. In fluidized bed boilers, the bed materials and piping of slurries and caustic materials cause erosion and corrosion. The process of erosion-corrosion may result in material loss and damage. Proper analytical modeling of the erosion-corrosion processes validated by experiments is needed to estimate the extent of damage in the material.;Empirical relations are available in the literature for predicting the amount of material loss due to erosion. These are obtained by conducting large number of experiments. …
Impedance Effects Of Metallic Ground Plane On The Ctha Antenna, Tao Guan
Impedance Effects Of Metallic Ground Plane On The Ctha Antenna, Tao Guan
Graduate Theses, Dissertations, and Problem Reports (ETD)
As with the fast-paced development of the communication industry, antennas have become an indispensable part of daily life. However, everyone may have experienced the malfunction of a communication system or radio due to a nearby human body or building or automobile. Then comes the question of how adjacent objects influence the antenna. This thesis has concentrated on the study of these effects on the impedance of the CTHA (contrawound toroidal helical antenna).;The results of this study indicate the CTHA's input impedance changes as a damped sinusoid function of the distance between it and the metallic ground plane. For equivalent distances …
Experimental And Modeling Studies On A Catalytic Packed Bed Membrane Reactor, Ashutosh G. Deshpande
Experimental And Modeling Studies On A Catalytic Packed Bed Membrane Reactor, Ashutosh G. Deshpande
Graduate Theses, Dissertations, and Problem Reports (ETD)
In the present work, the effects of operating conditions in a catalytic packed bed membrane reactor were investigated with the reactant gases H 2 and CO flowing through the membrane tube, and an inert gas N 2 flowing on the outside. The reaction under study was methanol synthesis with BASF catalyst, and a gamma-alumina membrane with a nominal pore size of 40 A was used.;Preliminary experiments were carried out in the membrane reactor without any catalyst inside membrane to characterize it in terms of its flux, permeance, and selectivity of H2 over CO. Experiments were carried out in the packed …
Development Of A Heavy-Duty Vehicle Chassis Dynamometer Test Route, James Joseph Daley
Development Of A Heavy-Duty Vehicle Chassis Dynamometer Test Route, James Joseph Daley
Graduate Theses, Dissertations, and Problem Reports (ETD)
A heavy duty vehicle chassis dynamometer driving route, titled "City-Suburban Heavy Vehicle Route" (CSHVR) was developed. Data for designing the CSHVR were collected using a Campbell Scientific 21x. Procedures were developed to reduce statistically the speed and time data into representative speed vs. time cycles. Criteria for producing the speed vs. time cycles included average vehicle speed, standard deviation of vehicle speed and total cruise time. The speed vs. time cycle was converted into a speed vs. distance route with free acceleration ramps. Using this method, the CSHVR was developed. Testing of the CSHVR was completed using the West Virginia …
Determination And Analysis Of Natural Gas Vehicle Tailpipe Emissions Based On Continuous Cvs Measurement, Jingang Fu
Determination And Analysis Of Natural Gas Vehicle Tailpipe Emissions Based On Continuous Cvs Measurement, Jingang Fu
Graduate Theses, Dissertations, and Problem Reports (ETD)
Code of Federal Regulations Title 40 (CFR-40) specified a formula for calculating constant Dilution Factor (DF) to account for background pollutants in Constant Volume Sampler (CVS) emissions measurement system. However, it is recognized that the DF is dynamically changing due to the CVS mechanism. Based on the continuous measurement data obtained from natural gas vehicle emissions testing, a new approach was used in this study to calculate instantaneous DF of the CVS system during the test cycle. Using the instantaneous DF improves the accuracy of mass emission measurements, especially when the exhaust pollutant concentrations were approaching that in the ambient …
Determination Of Resistance Across Development Section Return Stoppings, James Robert Gandy
Determination Of Resistance Across Development Section Return Stoppings, James Robert Gandy
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis describes a ventilation engineering study to determine the resistance across return stoppings on continuous miner development sections. By determining the resistance across return stoppings, one equivalent resistance branch can be created to model leakage across a return stopping line on a development section. This thesis evaluates four types of return stoppings to determine which construction techniques and materials provide the highest resistance, thus allowing minimal leakage from the intake to return entry.;The first phase of the thesis outlines the data gathering process including; station locations, equipment requirements and techniques. Second, the data is used to create a model …
Implementation Of Courseware For Internet Delivery, Sohail Ramzan Khan
Implementation Of Courseware For Internet Delivery, Sohail Ramzan Khan
Graduate Theses, Dissertations, and Problem Reports (ETD)
A process centered environment for implementing courseware is presented. The proposed environment addresses some of the constraints in the existing state of the art technology, presently used for distance education. The environment interface is developed using MS FrontPage 98 web development software. The thesis describes the design and implementation of the environment, which is named WVUCT. WVUCT utilizes MS NetMeeting software as a mode for interacting with the students in many different ways. WVUCT uses MS FrontPage 98 for developing a web-based course. The course web once developed using the environment can be published to any httpd server for student's …
Rheological Properties Of Candle Filter Deposits At Elevated Temperatures And Pressures, Brian Robert Jordan
Rheological Properties Of Candle Filter Deposits At Elevated Temperatures And Pressures, Brian Robert Jordan
Graduate Theses, Dissertations, and Problem Reports (ETD)
In order to improve the performance of hot gas ceramic candle filters, the theological properties of two types of filter deposits were studied. Black powder from the IGCC (Integrated Gasification Combined Cycle) provided consistent data when sampled from two different sources. This powder's mechanical properties were independent of elevated temperature conditions, suggesting that the particle adhesion process is controlled by the theological properties of the powder. Per US DOE request an apparatus was built to more accurately simulate candle filtration, and it was used to show that the process was unaffected by elevated inlet pressure conditions. The system was modeled …
Velocity Profile In Confined Elliptic Fractures, Stephen Ronald Pack Jr.
Velocity Profile In Confined Elliptic Fractures, Stephen Ronald Pack Jr.
Graduate Theses, Dissertations, and Problem Reports (ETD)
The primary objective of this research is to determine the friction inside a smooth fracture and to incorporate the effect of friction on a fluid transient inside a tapered-elliptical-confined fracture. In order to do so, the non-uniform velocity profile in an elliptic fracture with laminar flow of both Newtonian and non-Newtonian fluids was calculated. A transient flow computer program is presented using the method of characteristics, to show the frictional effects on acoustic damping. However for flow inside a hydraulic fracture, the 3D velocity profile is highly non-uniform, and the use of Vav creates an error as Vmax >> Vav. The …
Hydrothermal Aging Of Zeolite-Based Catalysts, Joongjai Panpranot
Hydrothermal Aging Of Zeolite-Based Catalysts, Joongjai Panpranot
Graduate Theses, Dissertations, and Problem Reports (ETD)
In this study the RE-USY (Davision GO-40) FCC catalyst, a composite of RE-USY zeolite and alumina-silica gel matrix, was treated hydrothermally under simulated FCC regenerator conditions in a laboratory scale fluidized bed. Fresh and steam-aged catalysts were characterized by surface area reduction using the nitrogen BET and t-Plot surface area methods. The surface morphology was apparent from the scanning electron photomicrographs. An irreversible deactivation kinetic model developed earlier by Gardner.; S0- S/S0 ns=Ks t was applied to account for changes of surface area of the zeolite component as a function of time on stream, temperature and steam partial pressure. The …
Emissions Reduction Benefits Of Adapting Electronic Closed Loop Fueling Control On A Mechanically Controlled Spark-Ignited Engine, Frederick Scott Richmond
Emissions Reduction Benefits Of Adapting Electronic Closed Loop Fueling Control On A Mechanically Controlled Spark-Ignited Engine, Frederick Scott Richmond
Graduate Theses, Dissertations, and Problem Reports (ETD)
Recent government gaseous exhaust emissions regulations have been expanded to include a variety of mobile air pollution sources. Exhaust emissions from non-road engines have recently become a focus of Environmental Protection Agency (EPA) regulations. The term "non-road engines" covers many industrial and general aviation (GA) type engines that are currently unregulated. This study examines the gaseous exhaust gas emissions produced from a mechanically-controlled Lycoming IO-360-B GA engine and studies the benefits of conversion to electronic fuel injection with closed loop feedback control. The study concludes that the overall gaseous exhaust emissions from the unmodified engine far exceed current automotive standards. …
Computer-Controlled Autonomous Model Car: A Mechatronics Project, Aparna Sachidanand
Computer-Controlled Autonomous Model Car: A Mechatronics Project, Aparna Sachidanand
Graduate Theses, Dissertations, and Problem Reports (ETD)
Mechatronics is a synthesis of mechanical engineering and electronic engineering, and computer engineering, distinct areas that overlap in the design of systems. It represents the interdisciplinary nature of design and development of today's products.;The current research focuses on the design, construction and testing of a computer controlled autonomous model car which can exhibit intelligent behavior such as timed course execution, obstacle detection, and response to sensor inputs. The car is intended as a mechatronics design project that will be integrated into an existing one-semester mechanical engineering undergraduate instrumentation course.;The car was designed around a microprocessor board (Tern Analog Drive) controlled …
Computational Models Of Particle Size Effects On Brittle Oxide Scale Erosion, Ravi S. Tangirala
Computational Models Of Particle Size Effects On Brittle Oxide Scale Erosion, Ravi S. Tangirala
Graduate Theses, Dissertations, and Problem Reports (ETD)
Metals and alloys designed for machines at elevated temperatures have microstructures and chemistries optimized to provide strength and resistance to oxidation. The majority of the commercial high temperatures metal or alloys intended to use at temperatures below 850°C or so rely on the formation of a continuous surface layer of essentially oxide scale for further oxidation resistance. Erosion of these machine parts by the small solid particle entrained in the liquid or gaseous working environment is a serious problem in many industrial applications. Numerous experiments have been conducted to obtain empirical relations for predicting material loss during erosion and to …
Investigation Of The Formation Of Residual Ash On Candle Filters, Sharath J. Simha
Investigation Of The Formation Of Residual Ash On Candle Filters, Sharath J. Simha
Graduate Theses, Dissertations, and Problem Reports (ETD)
When coal undergoes combustion, not all the carbon in the coal may be consumed. This is due to improper mixing of reactants, proximity of cold surfaces and the desire to operate combustors at lower temperatures. Depending on the type of coal and the operating conditions of the combustor, there may be about 4--6% of unburned carbon in the refuse. This unburned carbon is carried along in the flow of gases and ash. If the combustion gas products are to pass through a high temperature gas filtration system, ash and unburned carbon are deposited on the wall of a candle filter. …
Resistance-In-Series Modeling In High-Shear Rotary Ultrafiltration, Ronald L. Vaughan Jr.
Resistance-In-Series Modeling In High-Shear Rotary Ultrafiltration, Ronald L. Vaughan Jr.
Graduate Theses, Dissertations, and Problem Reports (ETD)
Large volumes of spent oil-in-water emulsions are produced in the metal working (MW) industry. In high-shear rotary ultrafiltration (HSR-UF), disk membranes are rotated at speeds up to 1,750 rpm to generate hydraulic turbulence, which scours the membrane surface. Thus, the pump is required only to provide transmernbrane pressure and a small amount of recirculation.;A parametric waste-specific study was conducted to assess the ability of the resistance-in-series (RIS) permeate flux model to predict pressure-flux data collected in the HSR-UF of a synthetic MW fluid. Experiments were conducted using a pilot-scale HSR-UF system with a 0.11 mum average-pore size membrane at a …
Prediction Of Turbulent Mixing At The Interface Of Density Stratified, Shear Flows Using Cfd, Matthew Robert Umbel
Prediction Of Turbulent Mixing At The Interface Of Density Stratified, Shear Flows Using Cfd, Matthew Robert Umbel
Graduate Theses, Dissertations, and Problem Reports (ETD)
Numerical simulations were performed involving stratified, shear flows that have been investigated experimentally. One set of simulations dealt with a homogeneous shear flow involving miscible fluids. The other set of simulations dealt with a developing shear layer involving immiscible fluids. The re-fueling of a compensated fuel/ballast tank, which is partially characterized by a shear layer, was also simulated. In all the simulations a single fluid, scalar transport multiphase model and the k-epsilon turbulence model were used. In the simulations involving miscible fluids an interfacial thickness relationship given by delta/H∼(Ri*)--2.1 and an entrainment relationship given by E∼(Ri*)--1.1 were predicted. These relationships …
Identifying The Type And Appropriateness Of The Evaluations Of Selected Agriculturally Related Science And Technology-Based Usaid Projects Conducted Between 1985 And 1995, Allen E. Bayles
Graduate Theses, Dissertations, and Problem Reports (ETD)
A review of the literature indicated that baseline data that described how and what were being evaluated at the project level by agencies involved in third world development had not been published. This was a descriptive study using content analysis of the available evaluative reports for the USAID projects involved with the transfer of agriculturally-related technology identified in the National Science Foundation research project, Assessing the Literature on the Benefits of External Science and Technology Aid Assistance to Developing Countries (Pytlik, Vasudevan, Bayles & Spitznogle, 1997).;The research concludes that impact evaluations were not being conducted at the project level. While …
Determining Perspectives Of Selected Disciplines Concerning The Nature Of Technology Within Classic Literature, Bryan Calvin Maser
Determining Perspectives Of Selected Disciplines Concerning The Nature Of Technology Within Classic Literature, Bryan Calvin Maser
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this research was to identify if there was a significant difference between the perspectives of selected disciplines with regard to the nature and history of technology. A content analysis of classic literature from multiple disciplines to determine perspectives concerning the nature of technology served as a basis for the development of a general semantic differential instrument. The instrument was administered to a given population yielding a conceptual scoring of perspectives. Scored concepts were then cross referenced to respective disciplines to determine if the degree of difference between disciplines was statistically significant.
Local Damage Analysis Of Fiber -Reinforced Polymer Matrix Composites, Arsenio Domingo Caceres
Local Damage Analysis Of Fiber -Reinforced Polymer Matrix Composites, Arsenio Domingo Caceres
Graduate Theses, Dissertations, and Problem Reports (ETD)
While it is widely recognized that failure occurs as a result of damage accumulation, characterization of composite material behavior is currently limited to obtaining the elastic properties and the strength values. With such information, it is not possible to assess the remaining life of a structural component or to estimate the likelihood of failure as a function of the time in service. The present investigation concerns the development of a continuum damage mechanics (CDM) formulation for polymer-matrix composites assuming the damage accumulates in the matrix, fiber, and fiber-matrix interphase regions. A local approach was taken by dividing the analysis of …
Design Analysis Of Single-Span Advanced Composite Deck-And-Stringer Bridge Systems, Brian James Brown
Design Analysis Of Single-Span Advanced Composite Deck-And-Stringer Bridge Systems, Brian James Brown
Graduate Theses, Dissertations, and Problem Reports (ETD)
The advantages of advanced composite materials (ACM) over conventional materials motivate their use in highway bridges for rehabilitation and replacement of structures. However, the complexity of the composites has created a need for simplified design analysis procedures that account for both the geometry and material properties of ACM members and systems.;An analytical/experimental study of fiber-reinforced plastic (FRP) composite bridges consisting of cellular box decks and wide-flange I-beams as stringers is presented. The design analysis covers: (1) ply stiffnesses and strengths; (2) laminate engineering stiffnesses; (3) apparent stiffness properties for composite decks; and (4) stringer stiffness properties. Finite element modeling is …
Fuzzy Reliability Modeling Of Distributed Client -Server Systems, Patrick Louis Cross
Fuzzy Reliability Modeling Of Distributed Client -Server Systems, Patrick Louis Cross
Graduate Theses, Dissertations, and Problem Reports (ETD)
With the proliferation of client-server systems there is a need for new approaches to determine their reliability in the uncertain environment of the internet. The proposed methods analyze client-server reliability by accounting for uncertainties in the operational environment of the internet. The uncertainties are addressed with a fuzzy paradigm applied in a tractable, verifiable reliability model of client-server systems. For computer hardware, fuzzy sets were used to address vague reliability data using bi-state fuzzy probabilistic theories. For software and operating systems, fuzzy sets account for the uncertainties in bi-state failure data using fuzzy possibility theories. Client-server architectures, such as hypercubes, …
Engine Instrumentation And Data Analysis For Ignition System Testing, William Joseph Chambers
Engine Instrumentation And Data Analysis For Ignition System Testing, William Joseph Chambers
Graduate Theses, Dissertations, and Problem Reports (ETD)
The charge ignition system is used to ignite the fuel-air mixture in the combustion chamber of a spark ignited internal combustion engine and is the subject of many ongoing research projects. As a means to quantify the performance of an ignition system, a 16 horsepower Briggs and Stratton V-twin engine has been instrumented and the necessary data analysis software developed. This test engine was used to monitor the performance of three different ignition sources. When the performance of these ignition sources was analyzed using the test engine, the differences in performance of the systems was evident in the calculated values …
Fault-Injection Through Model Checking Via Naive Assumptions About State Machine Synchrony Semantics, Sabina Joseph
Fault-Injection Through Model Checking Via Naive Assumptions About State Machine Synchrony Semantics, Sabina Joseph
Graduate Theses, Dissertations, and Problem Reports (ETD)
Software behavior can be defined as the action or reaction of software to external and/or internal conditions. Software behavior is an important characteristic in determining software quality. Fault-injection is a method to assess software quality through its' behavior. Our research involves a fault-injection process combined with model checking. We introduce a concept of "naive assumptions" which exploits the assumptions of execution order, synchrony and fairness. "Naive assumptions" are applied to inject faults into our models. We use linear temporal logic to examine the model for anomalous behaviors. This method shows us the benefits of using fault-injection and model checking and …
Development And Validation Of A Modular Hybrid Electric Vehicle Simulation Model, William Frederick Kellermeyer Iii
Development And Validation Of A Modular Hybrid Electric Vehicle Simulation Model, William Frederick Kellermeyer Iii
Graduate Theses, Dissertations, and Problem Reports (ETD)
To attempt to bring rigor and analysis to the design process, accurate simulation programs are crucial. Most hybrid electric vehicle hybrid electric vehicle (HEV) simulation programs are written for very specific component configurations and only allow changes in component sizes. These programs prove helpful only if one designs a component configuration similar to the one already simulated. A modular based program such as the one developed here allows simpler reconfiguration of the components for an accurate simulation of almost any component configuration design. This HEV simulation program allows for simulation of all three types of hybrids, with several engine types …
Derepression Of Heterochromatin Inactivation By Induction Of A Nearby Promoter In Drosophila Melanogaster, Daniel Renick Mcneill
Derepression Of Heterochromatin Inactivation By Induction Of A Nearby Promoter In Drosophila Melanogaster, Daniel Renick Mcneill
Graduate Theses, Dissertations, and Problem Reports (ETD)
Position-effect variegation (PEV) describes the compaction of a euchromatic gene placed next to a region of heterochromatin. This compaction into heterochromatin in some instances results in a mosaic phenotype in Drosophila melanogaster. Since its discovery in the 1930's the phenomenon of PEV has been extensively analyzed and many models describing the mechanics have been proposed. But, until recently a model system for analyzing the phenomenon at various developmental stages was not available. In 1996, Lu, Bishop, and Eissenburg were able to use a transgenic construct that variegates for both a heat shock 70 promoter-driven lacZ construct and a mini-white gene, …
Two-Stroke Linear Engine, Subhash Nandkumar
Two-Stroke Linear Engine, Subhash Nandkumar
Graduate Theses, Dissertations, and Problem Reports (ETD)
Linear, crankless, internal combustion engines may find application in the generation of electrical power without the need to convert linear to rotary motion. The elimination of the connecting rod and crankshaft can improve the efficiency of the engine significantly and the reduced weight and cost are added advantages. A linear, crankless, internal combustion engine prototype has been developed for electrical power generation in combination with a linear alternator. The operation of this engine is distinct from that of a conventional slider-crank mechanism engine, insofar as the motion of the two horizontally opposed pistons is not externally constrained. A two-stroke engine …