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Endurance operation of a heaterless C12A7 electride plasma cathode and post operation material analysisDrobny, Christian, Wätzig, Katja, Rost, Axel, Tajmar, Martin 07 November 2024 (has links)
A heaterless plasma cathode using disc shaped C12A7 electride as emitter material is being developed for electric propulsion systems in space. C12A7 electride is a calcium-aluminate ceramic (12CaO · 7Al₂O₃) with a low work function of about 2.4 eV. The material has been optimized for improved thermionic emission and discharge stability. Due to the low work function of the emitter material, the cathode can be easily ignited from room temperature, eliminating the need of a complex and delicate heater. The cathode has been operated continuously for more than 950 h with the results being presented. After this endurance operation, a detailed material analysis (phase composition and microstructure) has been conducted and is presented.
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Nástroje a právní zajištění řízení pracovního výkonu / Tools and legal background for the management of working performanceDevánová, Renata January 2011 (has links)
The thesis is created as a brief economic and legal guide to the process of work performance. Comprising of legal assurance of the process and specific instruments for each stage, it focuses mainly on resolving low performance of workers in organization and creating an efficient rewards system within the legal boundaries of czech law system. Each phase of the process, including goal setting and monitoring is described considering all the economic and legal aspects.
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