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Articles 1951 - 1980 of 2868
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Proton Coupled Electron Transfer Kinetics Of Redox Centers Attached To Self -Assembled Monolayers On Electrodes, Nicholas Madhiri
Proton Coupled Electron Transfer Kinetics Of Redox Centers Attached To Self -Assembled Monolayers On Electrodes, Nicholas Madhiri
Graduate Theses, Dissertations, and Problem Reports (ETD)
Proton-coupled electron transfer (PCET) reactions play an important role in many biochemical systems and have been focus of great interest recently. These reactions can be represented by a general equation: Ox + ne - + hH+ ↔ Red.;Traditionally, these reactions have been studied by applying predictions from the stepwise model developed by E. Laviron in the early 1980s. This model is based upon treating the proton transfer step and electron transfer step as discrete steps. Proton transfer is assumed to be at equilibrium under all conditions. However, there is also evidence suggesting a concerted mechanism in which the electron and …
Analysis Of Energy Consumption In Continuous Galvanizing Lines, Raviraj Ratnakar Chavan
Analysis Of Energy Consumption In Continuous Galvanizing Lines, Raviraj Ratnakar Chavan
Graduate Theses, Dissertations, and Problem Reports (ETD)
The pot hardware in continuous galvanizing lines is prone to failure and needs to be replaced quite frequently. This resulted in considerable loss of production time. Also equipment like, the molten zinc pot and annealing furnace cannot be turned off during downtime resulting in considerable energy consumption during downtime too.;A profound study of the energy aspect of the equipment used on galvanizing line was done. A systematic approach was used to collect and analyze the data from galvanizing facilities. A decision support system (DSS) that will take into account all the major energy consuming equipment in a typical hot dip …
A Pc-Based Fluid And Heat Transfer Analyzer For Two-Phase Flow In Pipes, Gbolahan Afonja
A Pc-Based Fluid And Heat Transfer Analyzer For Two-Phase Flow In Pipes, Gbolahan Afonja
Graduate Theses, Dissertations, and Problem Reports (ETD)
Modeling the simultaneous flow of gas and liquid or two-phase gas-liquid flow in pipes is a key aspect in petroleum production. These models can enhance our ability to estimate fluid properties, predict pressure loss, liquid holdup, and flow pattern, and to see the effects of introducing concepts such as heat transfer to the system. Modeling two-phase flow phenomenon also allows visualization of the interaction of one property or parameter to another. The understanding of heat transfer in two-phase gas-liquid flow is important for economic and optimized operations.;This work focuses on the design of a PC-Based Software for modeling the effect …
The Effect Of Reservoir Characteristics On Methane Production From Hydrate Bearing Formations, Sachin Gandra
The Effect Of Reservoir Characteristics On Methane Production From Hydrate Bearing Formations, Sachin Gandra
Graduate Theses, Dissertations, and Problem Reports (ETD)
Demand for natural gas is ever increasing and according to DOE [1], by 2040, 10 Tcf/yr of gas has to be imported. Interest in the potentially large deposits of natural gas hydrates and hydrate capped gas reservoirs is increasing because a conservative estimate of gas hydrate reserve potential of US exclusive economic zone is 200,000 Tcf [2, 3]. If 1% of this were recovered, that would be greater than the cumulative gas reserves of conventional gas sources (1000-1500 Tcf). Even 1% production of this recovered gas per year would make USA the exporter of gas.;Gas hydrates are solid, crystalline ice …
Optical-Based Atr Algorithms For Applications In Swarmed Uavs, Vasavi Rangammagari
Optical-Based Atr Algorithms For Applications In Swarmed Uavs, Vasavi Rangammagari
Graduate Theses, Dissertations, and Problem Reports (ETD)
Swarmed Unmanned Aerial Vehicles (UAVs) with Automatic Target Recognition (ATR) technology are becoming an important element of electronic warfare. The advantages of UAVs over piloted vehicles have increased the need to develop robust and reliable ATR algorithms. Various issues like changing weather, camouflage, low contrast and resolution, clutter, inadequate databases place a limit on the performance capabilities of a typical ATR algorithm. In an effort to deal with these issues, a correlation-based algorithm is proposed in this thesis. This algorithm calculates the correlation between the input image and a target template which is created by projecting a 3-D model from …
A New Reduced Order Model For Solid Oxide Fuel Cells, Suryanarayana Raju Pakalapati
A New Reduced Order Model For Solid Oxide Fuel Cells, Suryanarayana Raju Pakalapati
Graduate Theses, Dissertations, and Problem Reports (ETD)
Fuel cells are one of the promising eco-friendly and efficient electricity generators for future energy infrastructure. Rigorous research has been underway for over a decade to develop fuel cell technology as a viable alternative to the conventional energy sources. Numerical modeling has played a prominent role in such research endeavors. Detailed multi-dimensional models reveal important information regarding the performance of a fuel cell but they are computationally intensive. Relatively simple zero- and one-dimensional models on the other hand average out the details that could be critical. The topic of this dissertation is a new strategy for modeling fuel cells which …
Resistance To Change Of Responding To Stimulus Relations, Marta Leon
Resistance To Change Of Responding To Stimulus Relations, Marta Leon
Graduate Theses, Dissertations, and Problem Reports (ETD)
Three experiments assessed resistance to change of response accuracy under different reinforcement rates. Fifteen college students responded to a matching-to-sample task, with one set of baseline conditional relations reinforced at a rich rate and another set reinforced at a lean rate. In two experiments, resistance to change was assessed by presenting tests for emergent equivalence relations and then reversing some of the baseline conditional discriminations and examining changes in the equivalence classes after the reversal; the experiments differed in the presence or absence of overtraining for the rich condition. The third experiment assessed resistance to change by testing for emergent …
Development Of Microfluidic Devices For Proteomics, Trust T. Razunguzwa
Development Of Microfluidic Devices For Proteomics, Trust T. Razunguzwa
Graduate Theses, Dissertations, and Problem Reports (ETD)
We have developed functional components for a comprehensive microfluidic system for proteomic analyses. This dissertation presents development of an electroomsotic pump for delivery of fluids to other microfluidic channels, a hydrodynamic flow restrictor for combining electrokinetic and hydrodynamic flow on a microfluidic chip-ESI-MS interface, and surface coatings to prevent analyte adsorption to microfluidic channels. A microfluidic chip ESI-MS interface with a novel voltage switching component is also developed for the separation of negative analytes at high pH, with positive ion mode ESI-MS detection of the analyte, converted to positive ions via a make-up solution induced pH change.
A Component-Based Approach To Verification And Validation Of Formal Software Models, Dejan Desovski
A Component-Based Approach To Verification And Validation Of Formal Software Models, Dejan Desovski
Graduate Theses, Dissertations, and Problem Reports (ETD)
Formal methods for verification of software systems often face the problem of state explosion and complexity. We present a divide and conquer methodology that leads to component based verification and analysis of formal requirements specifications expressed using Software Cost Reduction (SCR) models. The proposed methodology has the following steps: model partitioning, partition verification (either by model checking or testing) and composition of verification results.;We define a novel decomposition methodology for SCR specifications based on min-cut graph algorithms. The methodology identifies components in given SCR specifications and automates related abstraction methods. It also provides guidance on how to perform verification and …
Study Of The Dynamic Behavior Of Tablet Movement In A Rotating Drum Using Discrete Element Modeling (Dem) Method, Yongxin Song
Study Of The Dynamic Behavior Of Tablet Movement In A Rotating Drum Using Discrete Element Modeling (Dem) Method, Yongxin Song
Graduate Theses, Dissertations, and Problem Reports (ETD)
Particle shape is a very important factor affecting the accuracy of discrete element modeling (DEM) simulations. Therefore, the purpose of this study is to determine its effect on the dynamic behavior of tablet movement in a rotating drum. First, the shape of typical standard round tablets was represented using the intersection of three convex spherical surfaces. Contact algorithms for Tablet-Flat Surface, Tablet-Curved Surface and Tablet-Tablet were developed based on the geometry of this representation of the tablets' shape. Good agreement was obtained between the simulation results for the collision of two tablets and those obtained from experiments. In addition, simulation …
Development Of Predictive Nox Model For On -Road Heavy -Duty Diesel Engines, Mohan Krishnamurthy
Development Of Predictive Nox Model For On -Road Heavy -Duty Diesel Engines, Mohan Krishnamurthy
Graduate Theses, Dissertations, and Problem Reports (ETD)
Emissions models currently employed by EPA and CARB do not account for the variations in engine operation and their effect on emissions. Alternatively, this study, demonstrates the feasibility of using Engine Control Module (ECM) broadcast parameters such as Engine Speed, Engine Torque, Injection Timing, Fueling Rate, Manifold Air Temperature, Manifold Air Pressure, Coolant Temperature and Oil Temperature as inputs to in order to predict engine-out exhaust NO x emissions. These parameters were obtained when the engine operates in the Not-to-Exceed (NTE) zone, (which is defined by 40 CFR §86.1370-2007) for a continuous time period of at least 30s in length.;This …
Effects Of Duty Cycles On Diesel Engine Component Life Estimation, Dave Jayasinghe
Effects Of Duty Cycles On Diesel Engine Component Life Estimation, Dave Jayasinghe
Graduate Theses, Dissertations, and Problem Reports (ETD)
Engine manufactures have relied on over designed of engines and performance testing to ensure product reliability. The efforts to maximize efficiency and to predict performance characteristics have evoked an interest to study the in-cylinder pressure throughout the respective duty cycle. The duty cycle of an engine is defined as the history of speed and load conditions over which the engine operates in a specific application. Understanding the transient on-road diesel engine duty cycles has been one of major goals for the engine developers. To date there have not been any research performed to identify a wide variety of on-road diesel …
Productivity Index Of Multilateral Wells, Upender Naik Nunsavathu
Productivity Index Of Multilateral Wells, Upender Naik Nunsavathu
Graduate Theses, Dissertations, and Problem Reports (ETD)
In the history of petroleum science there are a vast variety of productivity solutions for different well types, well configurations and flow regimes. The main well types that were considered for calculating the productivity indexes were vertical wells and horizontal wells. The configurations considered were multilayer perforations, dual lateral wells with laterals at same depths, stacked wells etc. There are few solutions to estimate the well productivity for complex configurations like multilateral wells.;The main objective of this work is to identify a numerical solution method for calculating productivity indexes for different well configurations like single vertical well, single horizontal well, …
Evaluation And Performance Prediction Of Multimodal Biometric Systems, Nevena Samoska
Evaluation And Performance Prediction Of Multimodal Biometric Systems, Nevena Samoska
Graduate Theses, Dissertations, and Problem Reports (ETD)
Multibiometric systems fuse the evidence presented by different biometric sources in order to improve the matching accuracy of a biometric system. In such systems, information fusion can be performed at different levels; however, integration at the matching score level is the most commonly used approach due to the tradeoff between information content and accessibility. This work develops a tool in order to analyze the impact of various normalization schemes on the matching performance of score-level fusion algorithms. The tool permits the systematic evaluation of different fusion rules after employing normalizing and mapping the match scores of different modalities into a …
Machine Vision Applications In Uavs For Autonomous Aerial Refueling And Runway Detection, Larry W. Rowe Ii
Machine Vision Applications In Uavs For Autonomous Aerial Refueling And Runway Detection, Larry W. Rowe Ii
Graduate Theses, Dissertations, and Problem Reports (ETD)
This research focuses on the application of Machine Vision (MV) techniques and algorithms to the problems of Autonomous Aerial Refueling (AAR) and Runway Detection. In particular, real laboratory based hardware was used in a simulated environment to emulate real-life conditions for AAR. It was shown that the K-Means Clustering Algorithm solution to the Marker Detection problem could be executed at a frame rate of 30 Hz and it averaged a tracking error of less than one pixel while utilizing only 0.16% of the image. It was also shown that the solution to the Runway Detection problem could be executed at …
Cycles And Weight Effects On Emissions And Development Of Predictive Emissions Models For Heavy Duty Trucks, Kuntal A. Vora
Cycles And Weight Effects On Emissions And Development Of Predictive Emissions Models For Heavy Duty Trucks, Kuntal A. Vora
Graduate Theses, Dissertations, and Problem Reports (ETD)
NOX and PM emissions data from the 5--mode CARB HHDDT Schedule, UDDS, and AC5080 were reviewed, with reference to each other. Next, two-dimensional correlations were used to predict the emissions rate on one cycle from the rates of two other cycles. The two-dimensional analysis yielded better correlations.;The emission of NOX, CO, CO2, HC and PM were analyzed with respect to weight. Vehicles did not follow linear NOX emissions trends over large weight ranges. Fleet-wide emissions for HHDDT could be predicted.;Lastly, a method was proposed to predict emissions based on the vehicle's emissions history from other cycles and on the properties …
Barrier Properties Of Polymer Nanocomposites During Cyclic Sorption-Desorption And Stress-Coupled Sorption Experiments, Suneetha Burla
Barrier Properties Of Polymer Nanocomposites During Cyclic Sorption-Desorption And Stress-Coupled Sorption Experiments, Suneetha Burla
Graduate Theses, Dissertations, and Problem Reports (ETD)
It is well known that layered silicate nanoparticles, when distributed within the matrix of a polymer, can retard the diffusion of small molecules and improve barrier properties. This has been demonstrated in both sorption and permeation experiments in the past. In order to assess the long-term retention of barrier properties of polymer-layered silicate nanocomposites, it becomes important to study their response to various environmental effects.;The main theme of this investigation is to study the effect of several water exposure cycles and exposure coupled with external tensile stress on the barrier properties of various polymers like vinyl ester, polyester and epoxy …
Analysis Of Different Class Sizes On Decision Making Processes And Teaching Behaviors Of Highly Experienced Teachers (Hets) And Less Experienced Teachers (Lets), Ha Young Kim
Graduate Theses, Dissertations, and Problem Reports (ETD)
Objectives. This study examined the decision making process employed by two highly experienced teachers (HETs) and two less experienced teachers (LETS) as they planned for and taught lessons with two different class sizes; n=15-16 and n=30-31. A secondary purpose of this study was to investigate the influence of class size on teaching behaviors and student learning. Finally, this study used in-depth interviews to describe concerns associated with teaching and preparing lessons for classes of different size.;Design and setting. This was a mixed-methods study that utilized both behavioral analysis and qualitative methods of investigation. Qualitative methods included think-aloud, stimulated-recall techniques and …
The Five Song Cycles For Voice And Piano By Benjamin Britten Written Specifically For Peter Pears: The Effect Of Their Relationship, Robert Strauss
The Five Song Cycles For Voice And Piano By Benjamin Britten Written Specifically For Peter Pears: The Effect Of Their Relationship, Robert Strauss
Graduate Theses, Dissertations, and Problem Reports (ETD)
Benjamin Britten composed five song cycles for voice and piano to be performed by his partner, tenor Peter Pears: Seven Sonnets of Michelangelo , opus 22 (1940), The Holy Sonnets of John Donne, opus 35 (1945), Winter Words, opus 52 (1953), Sechs Holderlin Fragmente, opus 61 (1958), and Who Are These Children?, opus 84 (1969). These five cycles span almost the entire length of their personal relationship, the first having been composed the year they consummated their relationship in the United States, and the last seven years before the composer's death. These compositions give insight into the way that Britten …
Benefits To Signal Timing Optimization And Its To Corridor Operations, Darian Glitz
Benefits To Signal Timing Optimization And Its To Corridor Operations, Darian Glitz
Graduate Theses, Dissertations, and Problem Reports (ETD)
Traffic signals are one of the primary constraints on corridor capacity in the highway/arterial network. The amount traffic is impeded is heavily dependent on the quality of the signal timings.;The purpose of this research was to conduct a case study of a congested corridor to demonstrate the benefits of traffic signal retiming/optimization on corridor operations. Tactically, this research involved development and application of a methodology to develop and assess signal timing plan alternatives. The research demonstrated the benefits in terms of delay, travel time, emissions, and fuel consumption. Strategically, this project can be used to provide a concrete example of …
Development Of Gas Production Type Curves For Horizontal Wells In Coalbed Methane Reservoirs, Allen Ekahnzok Nfonsam
Development Of Gas Production Type Curves For Horizontal Wells In Coalbed Methane Reservoirs, Allen Ekahnzok Nfonsam
Graduate Theses, Dissertations, and Problem Reports (ETD)
Coalbed methane is an unconventional gas resource that consists of methane production from coal seams. The unique difference between CBM and conventional gas reservoirs is that it is a dual-porosity system characterized by complex interaction of the coal matrix and cleat system that are coupled through the desorption process. Coalbed methane reservoir performance is controlled by a complex set of reservoir, geologic, completion and operation parameters. To date there are very little tools to help with predicting the performance of CBM wells.;The purpose of this research was to develop a simple and reliable tool to help with gas production predictions …
The Reggio Emilia Approach To Education And Its Relationship To Art Education, Debra N. Hart
The Reggio Emilia Approach To Education And Its Relationship To Art Education, Debra N. Hart
Graduate Theses, Dissertations, and Problem Reports (ETD)
This project deals with the concept of the Reggio Emilia approach to education. This open-ended, child-centered method of teaching is coming into light as a methodology used to educate children in a positive and nurturing manner. From its basic philosophy and its guiding principles, the Reggio Emilia approach to education has a strong foundation. Its background, historical context, and existing literature on educational psychology support the use of this method. Current practices in art education and national and state standards make it difficult to envision the implementation of the Reggio Emilia approach to education, since it would require a dramatic …
A Delphi Study To Identify Teaching Competencies Of Teacher Education Faculty In 2015, Sonhwa Na
A Delphi Study To Identify Teaching Competencies Of Teacher Education Faculty In 2015, Sonhwa Na
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to reach consensus on future course delivery modes and recommended teaching competencies that would be required for teacher education faculty in future course delivery environments. A three-round, online modified Delphi study was used to answer the following research questions (RQs): (a) RQ1: What course delivery modes will teacher education faculty of traditional colleges and universities be using in 2015?, and (b) RQ2: What competencies will teacher education faculty of traditional colleges and universities need to teach using these delivery modes? Course delivery modes and general teaching competencies were determined as a result of consensus …
A Spatial Simultaneous Growth Equilibrium Modeling Of Agricultural Land Development In The Northeast United States, Yohannes G. Hailu
A Spatial Simultaneous Growth Equilibrium Modeling Of Agricultural Land Development In The Northeast United States, Yohannes G. Hailu
Graduate Theses, Dissertations, and Problem Reports (ETD)
With population growth and expansion of economic activities, urbanized places have expanded; and with growing per capita income, residential location preferences have shifted towards suburban and rural locations. In many places, such new growth has been accommodated with the development of agricultural lands. The concern from natural resource economics perspective is that agricultural lands are multifunctional. They have production uses, for which there are efficient markets, and amenity and environmental benefits, for which there are no efficient markets to value these attributes. This multifunctionality and the possible under-valuation of agricultural lands, irreversibility of development, and speculative effects of development on …
Three Essays In Environmental Markets: Dynamic Behavior, Market Interactions, Policy Implications, Irene Margaret Xiarchos
Three Essays In Environmental Markets: Dynamic Behavior, Market Interactions, Policy Implications, Irene Margaret Xiarchos
Graduate Theses, Dissertations, and Problem Reports (ETD)
In order to induce or support voluntary environmental behavior, the mechanisms of existing and possible environmental markets must be understood. This dissertation analyzes two issues related to voluntary environmental behavior: (i) The reactions of firms over the long term to stakeholder concerns about the environment (essay one). (ii) Interactions between recycled and primary markets for metals (essays two and three).;Although these essays consider different phenomena, they are underlain by common factors: the exploration of behavior in environmental markets, the importance of profit as a motivation for firms' actions, the centrality of the role of information, and the necessity to look …
Workforce Competencies And Work -Based Learning In Maryland Community College Nursing Programs, Richard F. Ammon
Workforce Competencies And Work -Based Learning In Maryland Community College Nursing Programs, Richard F. Ammon
Graduate Theses, Dissertations, and Problem Reports (ETD)
This study assessed whether Maryland community college students who participated in the first semester of a nursing work-based learning clinical experience during the fall 2004 semester perceived that they developed basic workplace competencies necessary to work effectively in the workplace. The total population of the study consisted of 264 nursing students from eight Maryland Community Colleges. The research questions guiding this study were answered using descriptive statistics, t-tests, and an analysis of variance (ANOVA).;Major findings indicated that contrary to the hypothesis of the study, instead of showing a gain in competency scores, eight of nine workplace competencies decreased and three …
Ignition By Air Injection (Cibai) For Controlled Auto-Ignition In A Cfr Engine, Fernando Echavarria
Ignition By Air Injection (Cibai) For Controlled Auto-Ignition In A Cfr Engine, Fernando Echavarria
Graduate Theses, Dissertations, and Problem Reports (ETD)
Compression ignition by air injection (CIBAI) has been successfully achieved in a modified single cylinder, four-stroke, spark ignition cooperative fuel research (CFR) engine. The CIBAI cycle was invented by Professor John Loth and Professor Gary Morris, US patent No's: 6,994,057 Feb. 7, 2006 and 6,899,061 May 31, 2005. This new revolutionary combustion concept has the potential to become an alternative to traditional (SI) spark ignited and compression ignited (CI) diesel engines.;The objective of this dissertation was to demonstrate experimentally the viability of achieving ignition by air injection (CIBAI) for controlled auto-ignition in a CFR engine. This experimental work involved the …
Development Of Real Time Roof Geology Detection System Using Drilling Parameters During Roof Bolting Operation, Xianguang Tang
Development Of Real Time Roof Geology Detection System Using Drilling Parameters During Roof Bolting Operation, Xianguang Tang
Graduate Theses, Dissertations, and Problem Reports (ETD)
Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal. In fact, all U.S. underground coal mine entries are roof-bolted as required by law.;However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof bolting systems.;This research is to develop a method for predicting the roof geology and stability condition in real time during roof bolting …
Detection And Analysis Of Deck Cracks In A Long Span Empirically Designed Bridge Deck Through Embedded Sensory Systems, Mourad Y. Riad
Detection And Analysis Of Deck Cracks In A Long Span Empirically Designed Bridge Deck Through Embedded Sensory Systems, Mourad Y. Riad
Graduate Theses, Dissertations, and Problem Reports (ETD)
Bridge decks exhibit premature longitudinal and transverse cracks leading to dramatic decrease in their service lives. Because of safety concerns, state highway agencies are overburdened by conducting annual visual inspections to detect signs of distresses in bridge elements and to provide continuous records of the conditions of such bridges. Those inspections are time consuming, and have multiple limitations which often yield controversial outputs. In this study, an instrumentation based system is designed and implemented on the Star City Bridge near Morgantown WV, to provide more sophisticated, and accurate methods to assess the structural performance of bridge elements, and hence provide …
Object-Oriented Shipboard Electric Power System Library, Ram Praveen Saladi
Object-Oriented Shipboard Electric Power System Library, Ram Praveen Saladi
Graduate Theses, Dissertations, and Problem Reports (ETD)
The objective of this thesis is to explore the powerful capabilities of using an object-oriented modeling language to model and simulate an all electric Naval Shipboard Power System. Modelica has been used to model and simulate the shipboard power system which acts as an alternative simulation tool. The shipboard system is developed using the concept of packages. Different components like the buck converter, inverter, and AC machines have been modeled as a part of the library to develop the power system. The shipboard system has been simulated as two decoupled systems, the AC and DC systems. This research further focuses …