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 19 of 19 for “"Direct Energy Conversion"”.
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Space-charge dynamics and neutron generation in an inertial-electrostatic confinement device
… core. These aneutronic reactions are ideal for direct energy conversion.
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Collimation of deuterium / 3-helium fusion products for advanced spacecraft propulsion and power
… at this stage of exploration. While generating energy from a lightweight and reliable fusion source is important, another critical issue is harnessing this energy into usable power and/or propulsion. IEC fusion is a method of fusion plasma confinement that uses a series of biased electrodes that …
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Modeling and characterization of thermoelectric properties of SiGe nanocomposites
Direct energy conversion between thermal and electrical energy based on thermoelectric effects is attractive for potential applications in waste heat recovery and environmentally-friendly refrigeration. The energy conversion efficiency is related to the thermoelectric figure of merit ZT, which is …
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Photoacoustic measurement of bandgaps of thermoelectric materials
Thermoelectric materials are a promising class of direct energy conversion materials, usually consisting of highly doped semiconductors. The key to maximizing their thermal to electrical energy conversion lies in optimizing three inter-related material properties, thermal conductivity, electrical …
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Thermoelectric properties of silicon-germanium alloys
Direct energy conversion from thermal to electrical energy, based on thermoelectric effects, is attractive for potential applications in waste heat recovery and environmentally friendly refrigeration. The energy conversion efficiency of thermoelectric devices is related to the thermoelectric figure …
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Production of single cell anode-supported SOFC using NiO/YSZ-YSZ-LSM/YSZ powder materials
Solid oxide fuel cell (SOFC) is an energy conversion device that converts gas into electricity directly. The components consist of anode, electrolyte and cathode which have different properties and operate at high temperatures up to 1000 οC. SOFC requires a thin, robust, porous anode, dense …
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Aluminium nitride (AlN) as buffer layer for deposition of gallium nitride (GaN) thin films on silicon substrates using magnetron sputtering technique
Group III-nitrides semiconductors composed of gallium nitride (GaN), Indium nitride (InN), and aluminium nitride (AlN) had found use in broad technologies especially in optoelectronic and power devices. The main issues that limit the performance of GaN-based ultraviolet light-emitting diodes …
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A comprehensive fractal approach in determination of the effective thermal conductivity of gas diffusion layers in polymer electrolyte membrane fuel cells
The challenges in the fuel cell industry is to produce the efficient thermal and water management for accurate determination of the effectiveness thermal conductivity of gas diffusion layers (GDL) used in polymer electrolyte membrane fuel cells (PEMFC‟s). This is one of the factors affecting the …
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Pulse electric field effect on cervical cancer cell: a plant based anti-cancer study
Cancer is listed in top ten global causes of death in 2016. The percentage of cancer incidence and mortality are steadily rising over the year. This necessitates alternate anti-cancer treatment as the conventional treatment have resulted in high number of long- term survivors who are left to deal …
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Fabrication and optimization of N-Cu2O thin film using electrodeposition method for homojunction solar cell
… A homojunction Cu2O is said to provide high conversion efficiency for solar cell. However, as Cu2O is a natural p-type semiconductor, it is a challenge to make an n-type Cu2O. In this study, n-Cu2O was prepared by using electrochemical deposition. The structural, morphological, optical and …
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Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells
… and 70:30 (NC73) were achieved using high-energy ball-milling. All powders were calcined at 600–800 °C, pelletized and sintered at 600 °C. Characterisation include the crystalline phases, thermogravimetry, thermal expansion coefficient (TEC), hardness and morphologies were conducted. …
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Comparative simulations of conceptual ion extractors for use in asymmetric inertial electrostatic confinement
… to generate thrust or collect power by means of direct energy conversion. To that end, a simulation was designed and run developing the first step of a series of simulations to characterize and rapidly develop HIIPER. This simulation is built in COMSOL Multiphysics and investigates different …
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Optimization of PEDOT: PSS thin film for organic solar cell application
As a clean and renewable energy source, the development of the organics solar cells is very promising due to the inorganic solar cell inconvenient production process and material shortness. In this work, P3HT: PCBM bulk-heterojunction devices were produced by spin coating organic layers onto ITO …
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Development of time delay current control for lead acid battery 12 v DC by using arduino
Development of time delay current control for lead acid battery 12 V dc by using Arduino is the aim of this thesis. The development problem is necessary before applying control techniques to guarantee the execution of any task according to a desired input with minimum error. The main objective of …
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Development of time delay voltage control for lead acid battery using arduino
A time delay controller with voltage control technique is designed and developed in this project. In order to control the output voltage, a DC-DC buckboost converter has been development. The buckboost circuit with mosfet as a switching component has been drives by using gate driver as a medium …
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Development of repetitive current control for lead acid battery using arduino
This project focused on development of repetitive current control for lead acid battery using Arduino. The project uses Buck-Boost converter circuit with reference voltage of 14V from lead acid battery. The range of buck operation input voltage is between 18V to 15V while boost operation input …
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Titanium dioxide (TiO2) as buffer layer in organic solar cell device
… one of the most promising ways to tackle today's energy issue by offering low production cost, light weight, mechanically flexible and possibility of large area fabrication. Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) blends is the most efficient fullerene …
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Limitation of lithium fluoride (LiF) properties for passivation layer in organic solar cells application
Organic solar cell (OSC) is a low cost renewable energy. Instead of semiconductor silicon solar cell; it is a device that converts the energy of light into electrical energy using photovoltaic effect. Nowadays, global warming and emission of greenhouse effect are the sources of the destruction of …
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Proyecto de mejora para la reducción de los costos de conversión de las fábricas de OPP Film Perú mediante la implementación de una unidad de autogeneración térmica de gas natural
El presente estudio sienta las bases para la implementación de una planta de autogeneración eléctrica alimentada de gas natural, para la empresa OPP Film Perú. Este proyecto busca reducir los costos de conversión de la empresa – específicamente, los costos de energía eléctrica – además de reducir …