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A Study Of The Antiwear Behavior And Oxidation Stability Of Fluorinated Zinc Dialkyl Dithio Phosphate In The Presence Of Antioxidants, Anuradha Somayaji May 2008

A Study Of The Antiwear Behavior And Oxidation Stability Of Fluorinated Zinc Dialkyl Dithio Phosphate In The Presence Of Antioxidants, Anuradha Somayaji

Material Science and Engineering Dissertations - Archive

The antiwear additive Zinc dialkyl dithio phosphate (ZDDP) is one of the most important components of engine-oil additives and a major source of phosphorus. Phosphorus plays a crucial part in mitigating engine wear, yet has been proven harmful to modern catalytic converters. Progressive regulatory caps on phosphorus content in automotive lubricants have led to widespread efforts to reduce its levels. A new fluorinated ZDDP (F-ZDDP) complex developed at the University of Texas at Arlington has found to breakdown at lower temperatures compared to ZDDP and has showed better wear performance than ZDDP alone. This would allow the possibility of further …

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Trajectory Optimization Using Collocation And Evolutionary Programming For Constrained Nonlinear Dynamical Systems, Brandon Merle Shippey May 2008

Trajectory Optimization Using Collocation And Evolutionary Programming For Constrained Nonlinear Dynamical Systems, Brandon Merle Shippey

Mechanical and Aerospace Engineering Theses - Archive

Trajectory design and optimization has a broad variety of applications in fields such as aerospace and electrical engineering. The solution of a trajectory that minimizes a cost function subject to nonlinear differential equations of motion and various types of constraints may be obtained by the methods of optimal control theory. A framework is presented for numerical solution of the optimal control problem. The solution is converted to that of a constrained discrete parameter optimization problem. Direct collocation and nonlinear programming are used to perform a local gradient-based search for the optimal solution. A genetic algorithm combined with a shooting method …

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Public Management Reform In Developing Countries: An Empirical Investigation Of Operational And Financial Efficiency Of Private Versus Public Airports In Latin America And The Caribbean, Alvin H. Brown May 2008

Public Management Reform In Developing Countries: An Empirical Investigation Of Operational And Financial Efficiency Of Private Versus Public Airports In Latin America And The Caribbean, Alvin H. Brown

Public Affairs Dissertations - Archive

Public enterprises in Latin American and Caribbean developing nations (LACDNs) are constantly struggling to make their public infrastructures in sectors such as banking, energy; telecommunications, trade, and aviation operate more efficiently and effectively. Public management reform is used to analyze the problems of government and provide solutions. The problems encountered are the growing cost of the public sector in conjunction with inefficient and unresponsive bureaucracies in LACDNs. Accordingly, the solutions involve governments focusing on ensuring that public enterprises are performing efficiently and effectively by adopting a holistic market approach for operating public enterprises. The purpose of this study is to …

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The Irony Of Proving Discrimination, Rosalyn Wilson-Green May 2008

The Irony Of Proving Discrimination, Rosalyn Wilson-Green

Public Affairs Dissertations - Archive

Currently America courts require plaintiffs alleging discrimination to not only prove the existence of present day discrimination but to also prove the "discriminatory intent." This dissertation contains two applications of the theory of unconscious discrimination as it reveals the difficulty of prevailing in discrimination cases. The assumption applied is that policy-makers use theories that dismiss or render invisible the presence of subtle discrimination. This perpetuates the problem and hinders its adequate address. Since so many people suffer because of discrimination's invisible-yet present existence, measures must be taken to unveil the remedy this subtler form of discrimination. In this dissertation, I …

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Public Management Reform In Developing Countries: An Empirical Investigation Of Operational And Financial Efficiency Of Private Versus Public Airports In Latin America And The Caribbean, Alvin H. Brown May 2008

Public Management Reform In Developing Countries: An Empirical Investigation Of Operational And Financial Efficiency Of Private Versus Public Airports In Latin America And The Caribbean, Alvin H. Brown

Public Affairs Dissertations - Archive

Public enterprises in Latin American and Caribbean developing nations (LACDNs) are constantly struggling to make their public infrastructures in sectors such as banking, energy; telecommunications, trade, and aviation operate more efficiently and effectively. Public management reform is used to analyze the problems of government and provide solutions. The problems encountered are the growing cost of the public sector in conjunction with inefficient and unresponsive bureaucracies in LACDNs. Accordingly, the solutions involve governments focusing on ensuring that public enterprises are performing efficiently and effectively by adopting a holistic market approach for operating public enterprises. The purpose of this study is to …

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Regenerative Peripheral Neurointerfacing Of Upper Extremity Prostheses, Kshitija Garde May 2008

Regenerative Peripheral Neurointerfacing Of Upper Extremity Prostheses, Kshitija Garde

Bioengineering Theses - Archive

Current robotic prosthetic devices provide limited functionality to the user as they rely on gross myogenic control and lack critical sensory feedback needed for fine movement control. Interfacing the nervous system with the robotic prosthesis would facilitate amputees to control them naturally, in resemblance to the human hand. Functional neuro-electrode connections have been demonstrated in the brain and peripheral nervous system; however, gliosis, micro hemorrhages, axonopathy and excessive inflammation limit their long-term use. We evaluated the possibility of enticing peripheral nerve regeneration through a multi-electrode array with an open architecture as an alternative to enhance longevity of nerve-electrode interface. Regenerative …

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Feeling Better Than Most People Think: Nature And The Body In Wallace Stegner's All The Little Live Things And The Spectator Bird, Angela Renae Sowa May 2008

Feeling Better Than Most People Think: Nature And The Body In Wallace Stegner's All The Little Live Things And The Spectator Bird, Angela Renae Sowa

English Theses - Archive

Much of the critical scholarship on Wallace Stegner has focused, and continues to focus, on his role in the conservationist movement, on his environmental non-fiction, or on his skill as a teacher of writing. While these elements of his artistry are undeniably important, even vital, as subjects of scholarly study, there is a surprising lack of criticism on his novels. Stegner the man, conservationist, teacher, and historian often seem to overshadow Stegner's writing itself. In an effort to further the scholarly conversation on the literary elements of Stegner's novels, this study examines two of his later works, All the Little …

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Energy-Efficient Connected K-Coverage, Duty-Cycling, And Geographic Forwarding In Wireless Sensor Networks, Habib M. Ammari May 2008

Energy-Efficient Connected K-Coverage, Duty-Cycling, And Geographic Forwarding In Wireless Sensor Networks, Habib M. Ammari

Computer Science and Engineering Dissertations - Archive

With the fast advances in inexpensive sensor technology and wireless communications, the design and development of large-scale wireless sensor networks has become cost-effective and viable enough to attract the attention of a wide range of civilian, natural, and military applications, such as health and environmental monitoring, seism monitoring, and battlefields surveillance. The main challenge in the design of wireless sensor networks is the limited battery power of the sensors and the difficulty of replacing and/or recharging these batteries due to the nature of the monitored field, such as hostile environments, and cost. Thus, it is necessary that the sensors be …

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A Multi-Level Biomedical Ontology-Enabled Broker: Dynamic Service-Based Data Source Integration, Sheng-Chieh Jack Fu May 2008

A Multi-Level Biomedical Ontology-Enabled Broker: Dynamic Service-Based Data Source Integration, Sheng-Chieh Jack Fu

Computer Science and Engineering Dissertations - Archive

Web services have recently become a new trend for gathering biomedical information. However, it is not easy to integrate and obtain a concise/complete query result among thousands of service operations. In this dissertation, we propose a multi-level ontology-enabled service broker system for dynamically integrating web services in the biomedical domain (BioServiceBroker). By introducing multi-level modeling concepts and intra/inter level relationships, our approach facilitates more accurate modeling of biomedical ontologies, which leads to a better understanding of the data stored in various biological data sources as well as the services provided by the data sources. In addition, we incorporate temporal concepts …

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Practitioner Perceptions And Experiences With Evidence-Based Practice In The Practice Setting, Stephanie J. Hamm May 2008

Practitioner Perceptions And Experiences With Evidence-Based Practice In The Practice Setting, Stephanie J. Hamm

Social Work Dissertations - Archive

Evidence-based practice (EBP) in the profession of social work is a current concern in the response to a need to be accountable to the profession, clients, and the broader society. This approach to practice, introduced by the medical profession, includes researching and seeking research on interventions for practice that have been supported in previous findings. The purpose is to create the opportunity to offer the best practice interventions to client systems, in micro or macro practice. The current focus in social work is the question of implementation into practice and higher education, if indeed, EBP is a shift in the …

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Examining Ecological Factors To Form A Macro Model For Working With Impoverished African American Neighborhoods, Ebony Ladawn Hall May 2008

Examining Ecological Factors To Form A Macro Model For Working With Impoverished African American Neighborhoods, Ebony Ladawn Hall

Social Work Dissertations - Archive

This social science study examines three ecological factors (geographical, institutional, and social) of impoverished African American neighborhoods, while also assessing the differences of poor neighborhoods with lower amounts of poverty and those with higher amounts of poverty. Twelve of the poorest neighborhoods in Mobile and Prichard, Alabama were included in the study. The ecological factors included 1) geographical variables determined by the average age of the homes in neighborhood, number of hazardous areas, the number of unoccupied units, and the structural integrity of the neighborhood, 2) institutional variables determined by the number of operating businesses, churches, medical facilities, social organization, …

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The Roles Of Ingroup Identification, Prior Commitment, And Group Needs In Predicting Reactions To Group Defection, Melisa A. Holovics May 2008

The Roles Of Ingroup Identification, Prior Commitment, And Group Needs In Predicting Reactions To Group Defection, Melisa A. Holovics

Psychology Theses - Archive

Three experiments were conducted to explore the effects of group member defection (versus control) on reactions by ingroup members. In Study 1, emotional reactions were less positive toward defectors than toward controls, especially as a function of Ingroup Identification. In Studies 2 and 3, target Commitment level (low or high) to the group was added as a factor in the experimental design, and participants were led to believe that they would be having a discussion with either a highly or less committed ingroup member, or with either a (previously) highly or less committed defector. In Studies 2 and 3, Ingroup …

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Design For Reliability In Microoptelectromechanical Systems (Moems), Abiodun Abiodun Fasoro May 2008

Design For Reliability In Microoptelectromechanical Systems (Moems), Abiodun Abiodun Fasoro

Mechanical and Aerospace Engineering Dissertations - Archive

Microelectromechanical systems (MEMS) is an enabling technology for miniaturization. MEMS consist of micron sized moving mechanical structures and electronics fabricated on a suitable substrate such as silicon. MEMS has found applications in virtually every aspect of human life, ranging from the automobile to the aerospace, and from the telecommunications to the consumer electronic industries. Technology integration has led to several subsets of MEMS e.g. microoptoelectromechanical systems (MOEMS), radio-frequency MEMS (RF MEMS), etc. Together with these added functionalities, by way of technology integration come additional issues and challenges never before experienced by packaging engineers. MEMS and MOEMS package requirements vary widely …

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Geochemical Investigation Of Tungsten In Two Groundwater Flow Systems: The Carrizo Sand Aquifer, Texas, Usa, And The Aquia Aquifer, Maryland, Usa, Heeral B. Dave May 2008

Geochemical Investigation Of Tungsten In Two Groundwater Flow Systems: The Carrizo Sand Aquifer, Texas, Usa, And The Aquia Aquifer, Maryland, Usa, Heeral B. Dave

Earth & Environmental Sciences Theses - Archive

Groundwater sampled were collected from well sites located within the Carrizo Sand aquifer in Atascosa and McMullen counties in Texas, and also within the Aquia Aquifer, Maryland in the counties of Queen Anne's, Kent, and Ann Arundel in Maryland. During the field sampling trips, on site measurements were conducted for pH, specific conductance, temperature, alkalinity, dissolved oxygen (DO), oxidation-reduction potential (Eh), iron speciation ([Fe (II)/ Fe(III)]), and dissolved S (-II) concentrations. In order to examine and study solid phase tungsten concentrations in the Aquia (archived at the Maryland Geological Survey) and Carrizo Aquifer sediments, we collected a number of aliquots, …

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Dynamic Modeling, Control And Optimization Of Pem Fuel Cell System For Automotive And Power System Applications, Woon Ki Na May 2008

Dynamic Modeling, Control And Optimization Of Pem Fuel Cell System For Automotive And Power System Applications, Woon Ki Na

Electrical Engineering Dissertations - Archive

This dissertation is focusing on fuel cell dynamic modeling and control, the optimization design of fuel cell systems, power electronics interface designs, and control for the fuel cell based hybrid system. First, a dynamic PEM fuel cell model is proposed as a nonlinear, multiple-input, multiple-output (MIMO) system so that feedback linearization can be directly utilized and the PEM fuel cells can be protected through the controller. For the design of the dynamic model PEM fuel cells, all possible water effects are considered, and the anode and cathode gas pressures, as well as the fuel cell voltage are defined as the …

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Biaxial Mechanical Characterization Of Porcine Periosteum, Phillip Daniel Warren May 2008

Biaxial Mechanical Characterization Of Porcine Periosteum, Phillip Daniel Warren

Bioengineering Theses - Archive

Periosteum is multipotent tissue responsible for cortical bone deposition and is important in fracture repair. Research indicates the periosteum is mediated by similar mechanical signals to those that mediate bone growth and remodeling. Therefore, biaxial mechanical characterization of periosteum can be very informative, indeed. This paper presents the results of the first such examination. The porcine periosteum herein has at least three distinct layers - a cellular layer, an elastin-rich layer, and a collagen-rich layer - the latter two providing structural integrity. Not surprisingly then, the general biaxial mechanical characteristics of periosteum resemble those of other collagen and/or elastin-rich membranes. …

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The Relationship Of Oribatid Soil Mite Abundance To Abiotic And Biotic Factors, Carolyn Hess May 2008

The Relationship Of Oribatid Soil Mite Abundance To Abiotic And Biotic Factors, Carolyn Hess

Biology Theses - Archive

Oribatid soil mites primarily feed on fungi and dead organisms. They belong to the arthropod subclass, Acari, that are believed to contribute to soil processes such as plant litter breakdown and nutrient release. In order to facilitate more accurate predictions about obscure soil processes, research has been done that has attempted to correlate soil mite abundance and diversity to more easily measured aboveground biota. The present study examined monthly Oribatid soil mite abundance and its relationship to four different plant communities in North Texas: mowed grass monoculture, un-managed field, riparian, and woodland, during one growing season. Due to the nutritional …

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The ‘Failed’ Project Of Blackness In Contemporary Afro-Puerto Rican Discourse, Sonja Watson May 2008

The ‘Failed’ Project Of Blackness In Contemporary Afro-Puerto Rican Discourse, Sonja Watson

Modern Languages Faculty Publications - Archive

No abstract provided.

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Ground Reaction Force Profiles In Acl Reconstructed Female Athletes, Ashley Mcgavern May 2008

Ground Reaction Force Profiles In Acl Reconstructed Female Athletes, Ashley Mcgavern

Kinesiology Theses - Archive

Injury to the anterior cruciate ligament (ACL) has become a global topic of research, as the number of injuries is staggering and continues to increase each year because the underlying elements contributing to this injury have yet to be fully grasped. It is estimated that 80,000 – 250,000 ACL injuries occur annually in female athletics.(45) As a result, an estimated number of 100,000 ACL reconstructions are performed annually.(2) The uncertainty involving the contributing causes of this injury has naturally ushered uncertainty involving the treatment of the injury, i.e. surgical repair and subsequent rehabilitation. Although considerable gains toward improving surgical procedure …

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Composition - Microstructure - Property Relationships In Dual Phase Bulk Magnetoelectric Composite, Rashed Adnan Islam May 2008

Composition - Microstructure - Property Relationships In Dual Phase Bulk Magnetoelectric Composite, Rashed Adnan Islam

Material Science and Engineering Dissertations - Archive

The coexistence of coupled electrical and magnetic properties in the “magnetoelectric” material has led to the possibility of developing smarter and smaller electronic components. In order to make this possibility a reality, significant efforts are required to understand the science of magnetoelectric (ME) behavior and apply this understanding to develop higher sensitivity material. The primary aims of this thesis are to identify the role of composition, microstructural variables, composite geometry, texturing, post sintering heat treatment, and nanoscale assembly on ME coefficient. The overall objective is to synthesize, characterize and utilize a high ME coefficient composite. The desired range of ME …

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The Effects Of Perceived Racial Discrimination On Interparental Conflict And Child Emotional Adjustment In White, Hispanic, And Black Families., Kim Lashawn Rich-Rice May 2008

The Effects Of Perceived Racial Discrimination On Interparental Conflict And Child Emotional Adjustment In White, Hispanic, And Black Families., Kim Lashawn Rich-Rice

Social Work Dissertations - Archive

This study examined the effects of perceived racial discrimination on interparental conflict and child emotional adjustment in a sample of White, Hispanic, and Black adults. Through the utilization of data from the United Way of Metropolitan Tarrant County (UWMTC) Community Needs Survey, this secondary analysis was based on a comprehensive literature review and principles of stress and coping, social learning, and emotional security perspectives. Exploratory factor analysis was used as a validation technique for the constructs of Interparental Conflict and Child Emotional Adjustment, which were criterion variables in the study. T-tests examined the differences between interparental conflict and child emotional …

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Social Capital: The Missing Link Between Hiv/Aids Knowledge, Attitudes, And Related Behaviors Among Young Women In Tanzania, Mioara Diaconu May 2008

Social Capital: The Missing Link Between Hiv/Aids Knowledge, Attitudes, And Related Behaviors Among Young Women In Tanzania, Mioara Diaconu

Social Work Dissertations - Archive

The primary purpose of this study is to investigate the influence of various social capital predictor variables (e.g., human, family, emotional, physical, economic, community and educational social capital) on sexually transmitted infections (STI), HIV/AIDS, sexual and risky behavior knowledge, and attitudes towards people living with AIDS (PLA) among young people (ages 16-24) in Tanzania. This research also looks at the relationship between participants' STI and HIV/AIDS knowledge and their individual characteristics (age, sex, and education). The study also explores any statistically significant differences between young women's and young men's STI, HIV/AIDS, sexual and risky behavior knowledge and attitudes toward people …

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The Influence Of Ageism On Personnel Decision Making, Ashley Brooke Tipton Acker May 2008

The Influence Of Ageism On Personnel Decision Making, Ashley Brooke Tipton Acker

Psychology Dissertations - Archive

Ageism is a topic in today's world of great consequence, especially due to the multimillion dollar costs of age-related discrimination charges and the potential to ineffectively utilize organizational talent. Additionally, the demographic breakdown of the workforce indicates older individuals make up the majority of workers and that trend will continue for the foreseeable future. However, ageism affects both younger and older individuals; anyone in the workplace has the potential to be a victim of age-related stereotyping or discrimination. As such, this study sought to take past research a step further by examining the impact of ageism on personnel decision making …

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Voltage Profile Estimation And Reactive Power Control Of Distribution Feeders, David Timothy Chessmore May 2008

Voltage Profile Estimation And Reactive Power Control Of Distribution Feeders, David Timothy Chessmore

Electrical Engineering Dissertations - Archive

Distribution systems are important transportation links for the delivery of electric power. Understanding the system conditions of distribution feeders is vital for controlling power systems and maintaining electricity flow on power grids. With better knowledge of the system conditions on distribution feeders, a deliberate and systematic approach can be taken to achieve more efficient and reliable power delivery. Furthermore, better understanding of system conditions can be useful in reducing operation and maintenance costs in various power system applications such as voltage control and capacitor bank switching. This dissertation presents a novel method for estimating the voltage profile of a radial …

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Simultaneous Robot Localization And Mapping Of Parameterized Spatio-Temporal Fields Using Multi-Scale Adaptive Sampling, Muhammad Faizan Mysorewala May 2008

Simultaneous Robot Localization And Mapping Of Parameterized Spatio-Temporal Fields Using Multi-Scale Adaptive Sampling, Muhammad Faizan Mysorewala

Electrical Engineering Dissertations - Archive

This dissertation presents a Multi-scale Adaptive Sampling (AS) framework for combining measurements arriving from mobile robotic sensors of different scales, rates and accuracies, in order to reconstruct a parametric spatio-temporal field. The proposed sampling algorithm, "EKF-NN-GAS", is based on the Extended Kalman Filter (EKF), Radial Basis Function (RBF) Neural Networks and Greedy Search Heuristics. This novel AS algorithm responds to real-time measurements by continuously directing robots to locations most likely to yield maximum information about the sensed field. EKF is used to derive quantitative information measures for sampling locations. In addition, the localization uncertainty of the robots is minimized by …

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The Application Of Discrete-Event Simulation For Demining Strategy Evaluation, Hui-Chiao Jen May 2008

The Application Of Discrete-Event Simulation For Demining Strategy Evaluation, Hui-Chiao Jen

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Teams of mobile autonomous robots have been proposed for the detection and clearing of landmines. Several competing strategies for automated mine detection have been proposed. This paper will discuss the development of a tool that will support the quantitative analysis of various automated mine detection approaches used in Humanitarian Demining and Military Mine Field Breaching. The approaches used to model mine detection in a scout, breaching, and Humanitarian Demining scenario using a discrete-event simulation analysis tool are discussed. The model assumes that each UGV is autonomous rather than being directly controlled by a centralized command and control system. The algorithm …

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Passivation Of Si (100) Surface And Fabrication Of Doping-Free Mosfet, Muhammad Yusuf Ali May 2008

Passivation Of Si (100) Surface And Fabrication Of Doping-Free Mosfet, Muhammad Yusuf Ali

Electrical Engineering Dissertations - Archive

Chalcogen atoms have been successfully used for the passivation of GaAs(100) as well as Ge(100) and Si(100) substrates. Unlike GaAs(100) and Ge(100), the native oxide(SiO2) of Si(100) substrate is not soluble in ammonium sulfide solution ((NH4)2Sx) or water, which is a major problem to passivate Si(100) surface in a solution. In this work, a wet chemical process has been developed in which a compatible etchant ammonium hydroxide (NH4OH) is added with a passivating solution ((NH4)2S). Because of the compatibility of the etchant with the passivating solution, native oxide on Si(100) surface is removed in-situ to expose a fresh and clean …

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Mitigation Of Vibration In A Permanent Magnet Synchronous Machine Using Field Reconstruction, Umamaheshwar Krishnamurthy May 2008

Mitigation Of Vibration In A Permanent Magnet Synchronous Machine Using Field Reconstruction, Umamaheshwar Krishnamurthy

Electrical Engineering Dissertations - Archive

Permanent magnet synchronous machines (PMSM) are widely used due to their unique characteristics including high efficiency, high power density, simple construction, simple maintenance, and relative ease of control. With increasing need for automation, survivable and fault tolerant motor drives are highly in demand in many sectors of industry. Advancement in the area of modern power electronics has allowed researchers a great deal of flexibility in implementing complex control routines. While considerable of focus has been placed on improving schemes of control, not much effort has been put improvements in the performance of electric drives. It is also important to note …

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An Influenza Virus Molecular Infection Model And Discrete Event, Stochastic Simulation., Richard Burke Squires May 2008

An Influenza Virus Molecular Infection Model And Discrete Event, Stochastic Simulation., Richard Burke Squires

Computer Science and Engineering Theses - Archive

Influenza virus is responsible for the greatest pandemic in human history causing 20 - 40 million deaths worldwide during the 1918 flu season. In 1997 fears of a future pandemic arose with the discovery of a new strain of H5N1 avian influenza. In an effort to better understand the dynamics of influenza infection a new model of influenza virus infection at the molecular level has been developed. Comprising nineteen stages and five molecular types (mRNA, cRNA, vRNA, vRNP and proteins) the FluSim model consists of the major contributing pathogen factors to influenza infection. A discrete event, stochastic simulation based upon …

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Proteomic Strategies For Investigation Of Protein/Ligand And Peptide/Ligand Non-Covalent Interactions By Electrospray Ionization Mass Spectrometry, Abraham H. Lo May 2008

Proteomic Strategies For Investigation Of Protein/Ligand And Peptide/Ligand Non-Covalent Interactions By Electrospray Ionization Mass Spectrometry, Abraham H. Lo

Chemistry & Biochemistry Theses - Archive

Through universal proteomic methods and electrospray ionization-mass spectrometry (ESI-MS), multiple molecular recognition strategies were investigated as a prospective complementary tool for investigating protein-ligand interactions. Three model protein-ligand systems: bovine serum albumin/naproxen, cytochrome c/ATP & ADP, and integrin/RGD peptide were probed based on the categorical difference in the nature of each ligand. It was found that screening for protein binding sites from proteolytic digests was feasible for one of three models. Three different proteolytic digests of cytochrome c featured several examples of binding interaction with the ligands ATP and ADP. The detection of binding between intact cytochrome c and ATP/ADP was …

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