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 446 for “"conversion efficiency"”.
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Limits of High Harmonic Generation conversion efficiency
… low efficiencies and a study, which shows the efficiency scaling with laser and material parameters is essential. For a long time experimentalists were using only 800 nm driver pulses from Ti:sapphire lasers. With the advent of new light sources like optical parametric amplifiers, different …
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Spectral response and conversion efficiency of P-N junctions
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1962.
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Fabricataion of Dye Sensitized Solar Cells With Enhanced Energy Conversion Efficiency
… with the motivation to further enhance energy conversion efficiency of DSSCs. Firstly, electrospinning technique has been employed to prepare ZnO and TiO2 nanofibers, which serve as efficient photoelectrodes in DSSCs. Secondly, a novel conjugated polymer with unique D-p-A structure has been …
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A study of the conversion efficiency of an ammonia oxidation unit
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1929.
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Selected experiments on growth and food conversion efficiency of bluegill, Lepomis macrochirus
… on growth in length and weight and on food conversion efficiency by bluegill fed rations of mealworms. Two 30 day periods were utilized for each study. Part one, which examined the effect of aquarium volume on growth extended from January 20 to February 18 and from March 27 to April 25, …
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Development of indium arsenide quantum dot solar cells for high conversion efficiency
… to research this subject in order to obtain high efficiency solar cells. In this thesis InAs quantum dot (QD) solar cells are studied and investigated. The theory of using QDs as an intermediate band in GaAs-based solar cells is introduced. Three samples are grown for investigation, an MBE grown …
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Loss analysis of the power conversion efficiency of organic bulk heterojunction solar cells
… for this purpose. In this thesis the power conversion efficiency and lifetime of bulk heterojunction solar cells are analyzed. The electrical and optical losses are investigated for one representative material combination using two models for the bulk heterojunction solar cells. These models …
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The role of end-use energy conversion efficiency as a climate mitigation tool
Historically, conversion efficiency improvements have revolutionised the energy system, yet to reach climate targets, the scientific community agrees that even higher levels of energy efficiency improvement are required. When focusing on technical options there are two classes of technologies: …
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Spectrum and conversion efficiency measurements of suprathermal electrons from relativistic laser plasma interactions
… This thesis experimentally explores the coupling efficiency and spectrum of the laser produced electrons. The experiments make use of Bremsstrahlung and K-shell emission from planar foil targets to infer the electron distribution produced in the laser-plasma interaction. This thesis describes the …
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Photo-electrical conversion efficiency of dye sensitized solar cells prepared from Mopane leaf chlorophyll extract
… friendly materials. They have a good efficiency (about 10-14 %) even under low flux of sunlight. However, a major drawback is the temperature sensitivity of the liquid electrolyte. Hence, this study presents the ongoing research to improve the electrolyte’s performance by using natural …
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Food Habits, Growth, Conversion Efficiency and Response to Prey Odors of the Copperhead, Agkistrodon Contortrix
Food habits, conversion efficiency, and tongue flick rate (TFR) during exposure to food odors were investigated during this study. Sixty-one adult copperheads were examined for prey remains and yielded 31 prey items of which 50% were small mammals. Captive neonates were observed to feed only on …
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Optimizing energy conversion efficiency of a proton exchange membrane green hydrogen generation system while incorporating balance of plant modeling
… generation system for the highest energy conversion efficiency across the range of possible operating conditions with renewable energy input. This work is focused on creating a system model of a PEM green hydrogen generation system including the balance of plant components such as power …
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Analyzing variation in plant canopy conversion efficiency and assessing canopy and leaf photosynthetic efficiency in soybean with reduced chlorophyll content
The conversion efficiency of absorbed radiation into biomass (εc) is a component of yield potential. Unlike other efficiency components of yield potential, εc in C3 and C4 plant groups is estimated to be much lower than the theoretical maxima, signifying that εc limits yield potential but has room …
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Tailoring charge to spin conversion in novel materials for efficient spintronics
The charge-to-spin conversion efficiency is the crux of the future of spintronics and electronics as it enables the generation and employment of both spin and electric current in the same device. Usually, this conversion efficiency is an intrinsic material property, which cannot be easily modified …
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Holographic Spectrum-Splitting Design for Micro-Concentrating Photovoltaic Applications
… it provides high optical-to-electrical power conversion efficiency and energy yield at low cost. During the past few years the spectrum-splitting technology has been recognized as an important method to improve the overall power conversion efficiency and energy yield of solar photovoltaic …
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An air-breathing, portable thermoelectric power generator based on a microfabricated silicon combustor
… electrical power with a chemical-to-electrical conversion efficiency of 2.5% (based on lower heating value). The energy and power densities of the demonstrated system were 321 Wh/kg and 17 W/kg, respectively. The pressure drop through the system was 258 Pa for a flow of 15 liters per minute of …
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Root-cause analysis and characterization of oxygen-related defects in silicon PV material : an approach from macro to nanoscale
… achieved through different channels: improving conversion efficiency and device performance of silicon modules, increasing solar cell manufacturing yield, reducing silicon feedstock material use, etc. This research focuses on n-type monocrystalline silicon and aims to increase conversion …
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