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 121 for “"efficiency improvement"”.
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Efficiency improvement in nanometre CMOS outphasing power amplifiers
There is a pressing need for high-efficiency linear power amplifiers (PA) due to consumer demand for greater mobile data rates and battery lifetimes. The outphasing transmitter is one such technique that warrants research as it has yet to achieve commercial viability. It operates by decomposing a …
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Efficiency Improvement Strategies and Control of Permanent Magnet Motor Drives
… in variable speed applications for their high efficiency operation. Energy efficiency improvement in such motor drives is of interest in recent times because of rising cost of energy. Accordingly, two current control options for improving efficiency of these drives are taken for study and they …
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Energy efficiency improvement for faculty of technical and vocational education building
Energy efficiency becomes important matter due to correlate to sustainability and money. The ministry of Education Malaysia has urged all education center to conserved energy. Energy wastage tends to occur in Malaysian universities mainly due to inefficient use of energy and lack of awareness among …
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Smart Grid Technologies for Efficiency Improvement of Integrated Industrial Electric System
<p>The purpose of this research is to identify the need of Smart Grid Technologies in communication between industrial plants with co-generation capability and the electric utilities in providing the most optimum scheme for buying and selling of electricity in such a way that the fuel consumption …
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Combustion efficiency improvement in a rotary furnance using a post combustion chamber
Combustion Efficiency Improvement in a Rotary Furnace using a Post Combustion Chamber. Luwaya Edwin. Department of Mechanical Engineering, University of Zambia.Geometric parameters, of a rotary furnace, necessary for the improvement of combustion efficiency are analysed using Computational Fluid …
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Combustion efficiency improvement in a rotary furnance using a post combustion chamber
Combustion Efficiency Improvement in a Rotary Furnace using a Post Combustion Chamber. Luwaya Edwin. Department of Mechanical Engineering, University of Zambia.Geometric parameters, of a rotary furnace, necessary for the improvement of combustion efficiency are analysed using Computational Fluid …
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Lifetime and efficiency improvement of organic luminescent solar concentrators for photovoltaic applications
… solar cells and their low power conversion efficiency (PCE). To lower the cost per installed capacity ($/Watt) and to use the complete solar spectrum, new PV technologies have been developed, such as solar concentrators. Among the many kinds of concentrators, luminescent solar concentrators …
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Indoor navigation efficiency improvement in intelligent assistive systems (IAS) using neural networks
This thesis addresses the fundamental issue of indoor home navigation in Intelligent Assistive Systems (IAS). The issue of inefficient indoor home navigation exists in IAS because of the inefficient indoor home scene and object recognition. The problem is therefore addressed by developing different …
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Efficiency Improvement of WCDMA Base Station Transmitters using Class-F power amplifiers
… amplifier, traditionally, has very low energy efficiency. Poor energy efficiency directly affects operational costs and causes thermal heating issues in base station transmitters. Thus the power amplifier designer is forced to trade-off between linearity and efficiency. As a result of this …
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Irrigation scheduling: a soft adaptor to weather uncertainties and irrigation efficiency improvement initiatives
Expanding dairy farming around the world including the Canterbury region of New Zealand is causing increasing demand for irrigation, placing more pressure on already stressed water resources. The challenge for New Zealand dairy farming is to maintain an appropriate equilibrium between pasture …
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Efficiency Improvement of Cross-Compound Parabolic Concentrator for Silicon and Dye-sensitised Solar Cells
… (PV) systems due to their potential for enhanced efficiency. This thesis investigates the development and performance analysis of a novel concentrated device fabricated in the laboratory. A cross-compound parabolic concentrator (CCPC) with a 3.61× concentration ratio was integrated with …
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Efficiency Improvement of RF Energy Transfer by a Modified Voltage Multiplier RF DC Converter
… main challenge thereby is the power conversion efficiency from a low level RF input power to a Direct Current (DC) voltage which is able to supply the mobile system. For this purpose, a novel approach for RF DC conversion is proposed. It consists of a modified voltage multiplier RF DC converter …
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Direct Current Transformer (DCX): Converter Integration, Modular Operation, and Efficiency Improvement Through Synchronous Rectification
El Transformador de Corriente Continua (DCX) es un convertidor CC-CC aislado de relación fija, opera sin control en lazo cerrado, generalmente basado en topologías resonantes para maximizar la eficiencia. Está compuesto por un Generador de Tensión Conmutada de Alta Frecuencia, un transformador, un …
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Optimisation and efficiency improvement of pelton hydro turbine using computational fluid dynamics and experimental testing
… runner provided by Gilkes to produce better efficiency and simplify its design, 3) manufacturing of original and optimised design model runners and experimentally testing them. The numerical techniques created during part 1) included many numerical and physical assumptions to simplify the …
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Elucidating efficiency losses in cuprous oxide (Cu₂O) photovoltaics and identifying strategies for efficiency improvement
… using XRD, SEM, optical spectroscopy, quantum efficiency, current-voltage, and capacitance-voltage measurements. Then, these devices were modeled using SCAPS-1D, a numerical simulation package, as well as MATLAB for analytical solutions. This simulation enabled a quantitative breakdown of …
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Wind plant annual energy production maximisation and efficiency improvement with considerations for thrust and turbulence intensity
… the WP hence hampering its power and energy efficiency. Although sparse turbine deployments are common offshore to reduce wake effects and maximise efficiency, these resulting large T-2-T distances could increase operational and maintenance costs due to long cabling and tedious movement …
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Variable Ratio Matrix Transformer based LLC Converter for Two-Stage Low-Voltage DC-DC Converter Efficiency Improvement
… the trade-off between wide regulation range and efficiency exists in single-stage LDC design. Recently, a two-stage solution is proposed to achieve high efficiency and wide regulation range at the same time. The fixed turn ratio LLC stage serves as a dc transformer (DCX) to meet the galvanic …
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Integrating lean and TPM for process efficiency improvement in peruvian textile SMES: a case study in sewing line optimization
… small company, managed to implement significant improvements in the procedures of the sewing line. Reducing machine configuration times and optimizing production times are some of the objectives of this repository, using linear programming and the SMED method, it has been possible to exceed the …
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