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Articles 361 - 372 of 372
Full-Text Articles in Engineering
Stirling Convertor Control For A Lunar Concept Rover, Gina Blaze
Stirling Convertor Control For A Lunar Concept Rover, Gina Blaze
ETD Archive
NASA Glenn Research Center is developing various circuits for a lunar concept rover powered by both a stirling convertor and lithium ion batteries. To begin, a survey of six analog, non-power factor correcting controllers was done for an Advanced Stirling Convertor (ASC) design one was selected to control the stirling convertor. Next, a constant power circuit and lithium ion battery charger was designed, built and tested based on simulation in PSpice. The constant power circuit enables the stirling convertor to maintain a constant power when additional power is required from the batteries
Treatment Of Wastewater Containing Phenol And Heavy Metals Using Natural Zeolite And Bioaugmentation, Patrick Brian Jameson
Treatment Of Wastewater Containing Phenol And Heavy Metals Using Natural Zeolite And Bioaugmentation, Patrick Brian Jameson
ETD Archive
No abstract provided.
Development And Control Of A Solar Array Switching Module, Joseph E. Rymut
Development And Control Of A Solar Array Switching Module, Joseph E. Rymut
ETD Archive
This research focuses on the development and control of a solar array switching module (SASM). The objective of studying this problem was to develop the SASM hardware and design a controller for the SASM which would effectively deal with the wide ranging dynamics of the system and limit oscillations in the steady state. Initially an intuitive controller was designed to control the SASM. Following this an analysis of the SASM was preformed to create a model which described the SASMs operation. Using the system model, an analysis of a PI and a PII controller was completed which found that both …
Mathematical Model Of Ethanol Metabolism In Liver, Parag Pande
Mathematical Model Of Ethanol Metabolism In Liver, Parag Pande
ETD Archive
A lumped mathematical model of liver metabolism is presented to analyze the effect of ethanol on metabolic processes of 24 hr fasted rats. The model is developed in two parts. In the first part individual kinetic models for important regulatory steps in the liver metabolic pathways are developed and in second part transport and mass balance equations in the two well mixed domains: tissue and blood, are developed to calculate intermediate metabolite concentrations and fluxes in response to the changes in ethanol and lactate concentrations in the perfusion medium. Part of the model without ethanol metabolism has been validated and …
Development And Modeling Of High Temperature Polymeric Heater, Maziyar Bolourchi
Development And Modeling Of High Temperature Polymeric Heater, Maziyar Bolourchi
ETD Archive
Polymers are generally known for their excellent insulative properties. The addition of carbonaceous fillers such as carbon black and graphite within a polymer matrix can impart electrical and thermal properties making them good conductors. The resulting composites can be used in applications requiring and/or ranging from electromagnetic and radio frequency interference (EMI/RFI) shielding, electrostatic discharge (ESD) and heaters/heating elements to which metals have been the materials of choice. The advantages of using such composites include cost reduction, part consolidation, chemical resistance, lighter weight, and ability to easily design into complex three dimensional shapes via injection molding. For this work, various …
Studying The Interaction Of Antifreeze Proteins (Type I And Type Iii) With The Phospholipid Monolayers At Air/Water Interface, Suresh Essampally
Studying The Interaction Of Antifreeze Proteins (Type I And Type Iii) With The Phospholipid Monolayers At Air/Water Interface, Suresh Essampally
ETD Archive
Heart transplantation is a successful therapeutic procedure for the patients with end stage heart disease. Various preservative techniques have been developed to increase the shelf life of organs, but still there can be tissue damage during cold storage. One mechanism leading to damage is disruption of cell plasma membranes as they pass through temperature induced phase transitions. The addition of antifreeze protein (AFP) or glycoprotein (AFGP) to storage solutions has been hypothesized to reduce the leakiness of lipid membranes. From studies using liposomes it has been shown that AFPs can prevent leakage through lipid membranes, although the mechanism of interaction …
Performance Characteristics Of An Innovative Wind Power System, David James Kerze
Performance Characteristics Of An Innovative Wind Power System, David James Kerze
ETD Archive
This project entails a study of a wind energy recovery system that utilizes a unique three-dimensional spiral structure to amplify wind speed and direct it toward pluralities of turbines. The system is comprised of an outer spiral shell, internal support structure, turbines, and mechanisms for positioning the turbines to face the prevailing wind. Computational Fluid Dynamics (CFD) analyses were conducted to determine the wind speed amplification factors as a result of a simulated wind flow around the spiral structure. To ensure accuracy of the results, state of the art CFD techniques were applied using Gambit 2.2.30 and Fluent 6.2.16. Specifically, …
Flow Of Sub-Cooled Cryogens Through A Joule-Thomson Device: Investigation Of Metastability Conditions, John M. Jurns
Flow Of Sub-Cooled Cryogens Through A Joule-Thomson Device: Investigation Of Metastability Conditions, John M. Jurns
ETD Archive
Cryogenic fluid systems are fundamental to space flight architecture. Due to the unique properties of cryogenic fluids and the environments in which they operate for space flight, cryogenic fluid management systems must be developed to maintain these fluids at conditions in which they can be utilized. Liquid oxygen boils at 90 K, and liquid hydrogen boils at 20 K. Significant care must be taken to provide a thermal management system that prevents heat entering these fluids with consequential adverse effects on the performance of the cryogenic fluid systems. One critical component of a cryogenic thermal management system is a Joule-Thomson …
Byzantine Fault Tolerant Coordination For Web Services Atomic Transactions, Honglei Zhang
Byzantine Fault Tolerant Coordination For Web Services Atomic Transactions, Honglei Zhang
ETD Archive
This thesis describes a Byzantine fault tolerant coordination framework for Web services atomic transactions. In the framework, all core services, including transaction activation, registration, completion, and distributed commit, are replicated and protected by Byzantine fault tolerance mechanisms. The traditional two-phase commit protocol is extended by a Byzantine fault tolerant version that can tolerate arbitrary faults on the coordinator and the initiator sides, and some types of malicious faults on the participant side. To achieve Byzantine fault tolerance in an efficient manner, and to limit the types of malicious behaviors of the coordinator, a novel decision certificate is introduced. The decision …
Analysis And Implementation Of Ripple Current Cancellation Technique For Electronic Ballasts, Marius G. Marita
Analysis And Implementation Of Ripple Current Cancellation Technique For Electronic Ballasts, Marius G. Marita
ETD Archive
No abstract provided.
Analysis And Implementation Of A Synchronous Buck Converter Used As An Intermediate Stage Of An Hid Ballast, Sergey V. Vernyuk
Analysis And Implementation Of A Synchronous Buck Converter Used As An Intermediate Stage Of An Hid Ballast, Sergey V. Vernyuk
ETD Archive
The contribution of this thesis is the analysis of a Synchronous Buck converter, used as the second stage (which controls the current through the lamp, and consequently, the lamp power) in a 3-stage High-Intensity Discharge (HID) ballast. Where previously standard Buck converters were used, this new application of the Synchronous Buck converter to a medium-power lighting ballast improves efficiency by operating the converter in a new, modified critical-conduction mode to achieve soft-switching and improve efficiency significantly. The converter and 2-loop controller will be analyzed in the three HID lamp modes of operation: open circuit, short circuit, and power control mode. …
A Discrete Dimming Ballast For Linear Fluorescent Lamps, Haiyan Wang
A Discrete Dimming Ballast For Linear Fluorescent Lamps, Haiyan Wang
ETD Archive
No abstract provided.