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Benchmarking Performance and Degradation of Pt Supported on Different Carbons for PEMFC Applications Using Gas Diffusion Electrode Half-Cell
No full text3-D-geometry-triggered transition from monotonic to non-monotonic effects of wettability on multiphase displacements in homogeneous porous media
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Spent Fuel Management in the Decommissioning Process for the German High Temperature Reactors AVR and THTR-300
No full textSimulation and Analysis of Containment Behavior during selected Severe Accident Transients in a Generic Konvoi-type PWR using COCOSYS
No full textThe photovoltaic Dyson sphere
No full textThis study explores the concept of a photovoltaic Dyson sphere, a megastructure designed to capture and convert a star's energy for use in advanced technological applications. The temperature of a Dyson sphere composed of both blackbody and grey body materials is investigated. For efficient photovoltaic conversion, the semiconductor sphere must be coated with a black material to regulate temperature, ensuring it remains low enough for photovoltaic generation. The environmental impact on planetary conditions is also analyzed, revealing that only a Dyson sphere with an extension beyond Earth's orbit could allow life to persist on Earth while maintaining suitable temperatures for photovoltaic efficiency. Such a structure would still increase Earth’s temperature, necessitating planetary temperature control systems—an issue that parallels the challenges of mitigating global warming. Considering material availability in the solar system, it was found that a partial Dyson sphere at 2.13 AU, using 1.3 × 1023 kg of silicon, could generate 4 % of the Sun’s power, yielding 15.6 YW of electricity while increasing temperature on Earth by less than 3K
