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 98 for “"maximum efficiency"”.
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An exploratory design of a 65 nm CMOS buck converter for maximum efficiency
… battery life, it is necessary to maximize the efficiency of the power converter. A design is proposed for the topology and control of a 65 nm CMOS DC/DC switch-mode converter converting a 3 V battery supply to a 1.2 V output voltage for a maximum output current of 100 mA. The goal of the …
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EFFECTS OF GATE THICKNESS, GATE MORPHOLOGY, AND EMISSIVE MATERIAL ON ORGANIC LIGHT EMITTING VARACTOR CAPACITOR PERFORMANCE
To keep up with the demands of power efficiency and broadened applicability, new lighting technologies must be invented. Organic light emitting varactors (OLEVs) represent a promising future in this regard and are explored here. OLEVs are built similarly to OLEDs, with an added gate. Under AC …
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Analysis of low voltage regulator efficiency based on ferrite inductor
… (i.e., low voltage regulator) for power efficiency and percentage ripple reduction at frequencies between 1 and 10 MHz with variable loads from 0.024 to 4 ohms. The parameters, such as inductance of 20 nH, quality factor of 15 of fabricated ferrite inductor and DC resistance (DCR) of 8.3 …
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Optimal farm design with parabolic shape photovoltaic panels using multi-objective optimization
To acquire the maximum efficiency for solar electricity conversion, a solar panel has to absorb nearly every single photon of light emitted from the sun. The shape of the solar panel itself plays an important role in achieving this goal. Several studies have been conducted for different solar panel …
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The relationship between stroke intensity of words and typewritability
… and accuracy necessary to operate the machine at maximum efficiency.
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High efficiency gas-solid chromatographic columns
A study of two types of high efficiency gas chromatographic columns was conducted. The first type (micropacked) can be defined as columns having an internal diameter less than 1 mm and a particle/column diameter ratio between 0.1 and O.3 and a packing density comparable to conventional packed …
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Abnormal combustion - methanol versus gasoline
The maximum efficiency of conventional gasoline engines is largely determined by the compression ratio, and this is limited by the onset of kno8k. The maximum cylinder size is similarly constrained. The relatively higher knock resistance of methanol opens up possibilities for increased efficiency …
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The Role of Mirror Errors in Solar Energy Conversion
… that these errors play in decreasing the overall efficiency with which radiation is converted to work in a system that relies on reflection. Three theoretical approaches are taken. Taking a “black box” approach to an open cycle engine which converts radiation to work, basic relations are derived …
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The Role of Mirror Errors in Solar Energy Conversion
… that these errors play in decreasing the overall efficiency with which radiation is converted to work in a system that relies on reflection. Three theoretical approaches are taken. Taking a “black box” approach to an open cycle engine which converts radiation to work, basic relations are derived …
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A test platform for measuring the energy efficiency of AC induction motors under various loading conditions and control schemes/
… was developed to measure and compare the energy efficiency of an AC induction motor under steady-state and cyclical loading conditions while operating in both a constant speed mode and while performing speed to speed transitions. The details of the construction are provided. The motor under test …
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Design of a multi-module multi-phase battery charger for the NASA EOS space platform testbed
… improvements. The power stage is designed for maximum efficiency and minimum weight. The control loops (Charge Regulation and Bus Voltage Regulation) designs are presented and the small-signal models are verified with experimental results. The charger testing is facilitated by the use of the …
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The experimental evaluation of definite integrals
… practical importance. Gauss’ formulae yield maximum efficiency with respect to controlling the polynomial error and can be used appropriately when an analytical expression for the curve in question is available but defies exact integration, or if for some other reason the statistical error is …
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Productivity, Cost, and Technical Efficiency Evaluation of Southeastern U.S. Logging Contractors
… industry was determined by measuring technical efficiency, and by analyzing the demographic, organizational, business, productivity and cost information with a variety of quality control tools. Data Envelopment Analysis, a non-parametric statistical tool, was used to measure the technical …
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An Evaluation and Redesign of a Thermal Compression Evaporator
Evaporators separate liquids from solutions. For maximum efficiency, designers reduce the temperature difference between the heating and heated media using multiple-stage evaporators. This efficiency requires increased size and bulk. A vendor claimed its thermal compression evaporator achieved high …
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Gwadapt: An adaptive finite element algorithm for groundwater contaminant transport problems
… Optimization of the code was undertaken for maximum efficiency and economy on the Cray Y-MP processor, and to reduce run times for several of the simulations in this study; The computer code was used to simulate the first fifteen years of contaminant release from the Savannah River Site in an …
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Investigation of Novel Electrolytes for Use in Lithium-Ion Batteries and Direct Methanol Fuel Cells
… of renewable energy sources. To achieve maximum efficiency of renewable energy sources, improvements to energy storage materials must be developed. In this work, novel electrolytes for secondary batteries and fuel cells have been studied using nuclear magnetic resonance and high pressure …
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Theories and Techniques for Efficient High-End Computing
… 3) control power and performance for maximum efficiency. Our theories, techniques, and tools have been applied to high-end computing systems. Our theroetical models can improve algorithm performance by up to 59% and accurately predict the impacts of power on performance. Our techniques …
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Passive solar energy : modifications of existing masonry walls to improve thermal performance.
… collector was built using a selective surface, a maximum efficiency of about 50% was observed. A theoretical model was developed based on simple steady state theory, this was found to correlate well with experimental data. The theory could be used for any system of low thermal storage, including …
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Novel optimal control algorithms with application to the parallel hydraulic hybrid vehicle power train.
… and is largely responsible for gains in efficiency. The research presented in this thesis aims to answer the question of how to best operate the power train to achieve maximum efficiency during driving intervals when vehicle speed is unspecified, except at boundary points. A state-space …
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Silicon concentrator cells in a two-stage photovoltaic system with a concentration factor of 300x
… of 300x in combination with a high optical efficiency (around 78%) and a large acceptance angle of ± 23.5° all year through. For this, the system uses a parabolic mirror (40.4x) and a three dimensional second stage consisting of compound parabolic concentrators (CPCs, 7.7x). For the …
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