Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 88 for “"EFFICIENCY OF THE SYSTEM"”.
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Hybrid user interfaces : design guidelines and implementation examples
A hybrid user interface is a new type of computer user interface that achieves high usability by combining features of graphical user interfaces and command line interfaces. The main goal of a hybrid user interface is to increase the efficiency of a system that is used to perform repetitive tasks. …
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Design of a hybrid energy-generation system for autonomous kayaks
The goal of this research is to design and analyze a series-hybrid energy-production system for an autonomous kayak. Currently these vehicles have limited range due to energy storage in lead acid batteries. Extending the range would give the vehicles more operating time in their environments, and …
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Resonant wireless power transfer with embedded communication for more versatile and efficient applications
This thesis explores the feasibility of embedding communication within the power transfer channel of a near field wireless power transfer system in order to increase the versatility and efficiency of the system. The system was built around the LTC4125 auto-resonant wireless power transmitter IC. …
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A problem solving system employing a formal approach to means
The thesis describes the theory and design of a general problem-solving system. The system uses a single general heuristic based on a formal definition of differences within the framework of means/ends analysis and employs tree search during problem solution. A comparison is made with two other …
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Integrative Approach to Metal Extraction and Electrification
… technology that produces metals directly from their sulfide minerals. A particular focus of the technology has been on copper metal extraction from chalcopyrite. Molten sulfide electrolysis is competing against established technologies in a legacy industry. The premise behind this work is that …
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Classificação facetada em odontologia
… cre considered as related to retrieval language. The importance of faceted classification for special subjects. 250 titles on dentistry, were analysed. The terms, then got, were arranged into facets. There are five basic facets: OPERATIONS, AGENTS, ANATOMY & PHYSIOLOGY, PATHOLOGY, PATIENTS. Within …
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Transaction reconstruction
… are distributed and replicated to increase the efficiency and resiliency of a database management system; unfortunately, mechanisms to improve resiliency can have a substantial negative impact on the overall efficiency of the system. Current approaches to resiliency extend transaction …
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Model of reflectance of thermophotovoltaic cell and cold plate
The reflectivity of a gold-plated cold plate, and mounted multi-junction photovoltaic cells, is studied in the context of a thermal energy grid storage system. The emitter is modeled as a black body emitter. Improving the efficiency of the system requires high reflectance below the bandgap energy …
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Investigation of energy storage options for thermal management in hybrid electric vehicles
… vehicles could have a significant role in the sustainable transportation. Higher power density lead to extra heat generation and thermal runaway in the Li-ion cells. Therefore, a successful thermal management system is required to prevent temperature increase and non-uninform distribution …
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Efficient Operation of Diesel Generator Sets in Remote Conditions
… for standby and remote power generation over the past hundred years. Due to their use for standby power, these diesel gensets are designed to operate in conjunction with the grid, which relates to a fixed speed operation with a 60 Hz AC output. For operation in remote conditions, such as …
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Production model based on Lean Manufacturing and SLP to increase efficiency for a company in the metal mechanical sector
… with a rapidly growing manufacturing sector, the metal mechanic is one of the main driving forces because they provide machinery and tools for the rest of the sectors. However, this growth has been stopped by capacity limits and a wide range of troubles and delays that occur during the …
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Aircraft De-Icing System Using Thermal Conductive Fibers
<p>The accumulation of ice on the leading edges of aircraft wing poses complications for flight control as drag is increased with a tendency for higher relative turbulence over the wing. Pre-emptive and reactive ice removal techniques have been employed in the past by electromechanical, thermal, …
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Design and development of a novel DC/DC bidirectional converter with dual solar/PV-based snow removal and EV charging functionality
Different factors affect solar photovoltaic (PV) systems by decreasing input energy and reducing the conversion efficiency of the system. One of these factors is the effect of snow cover on PV panels, a subject lacking sufficient academic research. This thesis reviews current research for snow …
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Design of inflatable solar concentrator
Solar concentrators improve the performance of solar collection systems by increasing the amount of usable energy available for a given collector size. Unfortunately, they are not known for their light weight and portability, which is ideal for basic applications like solar cooking. The goal of the …
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Design of an AUV recharging system
The utility of present Autonomous Underwater Vehicles (AUVs) is limited by their on-board energy storage capability. Research indicates that rechargeable batteries will continue to be the AUV power source of choice for at least the near future. Thus, a need exists in both military and commercial …
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Simulation of Magnetically Confined Inductively Coupled Plasma
… parallel coil design was presented to address the need for high density inductively coupled plasmas with enhanced properties and a more uniform and consistent distribution, suitable for large-area material processing. Fluid model simulations of 3D argon inductively coupled plasma (ICP) were …
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The development of autocatalytic structural materials for use in the sulfur-iodine process for the production of hydrogen
The Sulfur-Iodine Cycle for the thermochemical production of hydrogen offers many benefits to traditional methods of hydrogen production. As opposed to steam methane reforming - the most prevalent method of hydrogen production today - there are no carbon dioxide emissions. Compared to other methods …
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Geothermal Systems Performance and Environmental Impacts
The use of fossil fuels for heating and cooling purposes is plagued by problems including environmental impacts, unsustainable production, and increased greenhouse gas production. This had led to a worldwide interest in developing sustainable sources of energy. One such energy is ground source heat …
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Testing of a counter-flow, stack-type sawdust dryer
The objective of this research was to test a prototype sawdust dryer designed by Arrowhead Forest Products, a wood products firm based in St. Louis. The dryer is designed to be used by small to medium sized sawmills and pallet mills. A series of 50 one hour or longer trials were conducted to …
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Autonomous Underwater Vehicle Propulsion Design
The goal of this design process was to achieve the most efficient propulsive system for the candidate autonomous underwater vehicle (AUV) as possible. A mathematical approach, using fundamental motor equations and derived quantities, was used to characterize and select an efficient brushless …
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