Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.00 vteřin. 
Radiation Transfer of Energy in Arc Plasma
Bogatyreva, Naděžda ; Kapička, Vratislav (oponent) ; Jeništa,, Jiří (oponent) ; Bartlová, Milada (vedoucí práce)
The main task of this work is to investigate the radiation transfer in thermal plasmas using the approximate method of spherical harmonic functions (PN-approximation). The thesis is of theoretical nature. Main attention was given to the most popular P1-approximation. Spectral dependence of absorption coefficients was handled by means of multigroup approximation. The computational code for calculation of radiation characteristics in isothermal plasma cylinder and in plasma cylinder with given temperature profile was prepared. Radiation characteristics of air plasma and plasma mixture of SF6 and PTFE were calculated. Obtained results account for data for including radiation losses into the total energy balance of arc plasma. They are used in mathematical models of electric arcs created by our collaborators from Institute of Plasma Physics Academy of Science in Prague and from abroad (ABB Corporate Research, Switzerland and Siemens AG Corporate Technology, Germany).
Radiation Transfer of Energy in Arc Plasma
Bogatyreva, Naděžda ; Kapička, Vratislav (oponent) ; Jeništa,, Jiří (oponent) ; Bartlová, Milada (vedoucí práce)
The main task of this work is to investigate the radiation transfer in thermal plasmas using the approximate method of spherical harmonic functions (PN-approximation). The thesis is of theoretical nature. Main attention was given to the most popular P1-approximation. Spectral dependence of absorption coefficients was handled by means of multigroup approximation. The computational code for calculation of radiation characteristics in isothermal plasma cylinder and in plasma cylinder with given temperature profile was prepared. Radiation characteristics of air plasma and plasma mixture of SF6 and PTFE were calculated. Obtained results account for data for including radiation losses into the total energy balance of arc plasma. They are used in mathematical models of electric arcs created by our collaborators from Institute of Plasma Physics Academy of Science in Prague and from abroad (ABB Corporate Research, Switzerland and Siemens AG Corporate Technology, Germany).
Aplikace waveletové analýzy a Fournierovy transformace pro zkoumání časoprostorové dynamiky termického plazmatu
Gruber, Jan
Analyzovali jsme plazma generované eklektickým obloukem v zařízení zvaném plasmatron. Elektrický oblouk i výsledný volný proud plasmatu byly pozorovány ze čtyř směrů ve dvou rovinách kolmých na osu jetu. Zároveň jsme zaznamenávali proud a napětí oblouku. Časové rozlišení a délka záznamu byly dostatečné pro aplikaci FFT. Tak jsme získali detailní pohled na oscilační procesy v proudu plasmatu a možnost srovnání s oscilacemi proudu a napětí. Identifikovali jsme význačné oscilace a zkoumali jejich rozložení v rovině. Waveletová analýza byla použita ke zkoumání dynamiky těchto struktur.

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