. "2011-01-01+01:00"^^ . . . "The project deals with transport, fluctuation phenomena and non-destructive diagnostics in autoemission cathodes. The aim is to study properties and behavior of oxide layers on tungsten and allied metals formed by etching. The project focuses on the stability of electron emission, V\u2013A and noise characteristics and emission divergence. The methodology is based on the analysis of noise spectral density at different vacuum levels, temperatures and electric field strengths. AEC feature some advantages over thermionic cathodes, as high current densities, good divergence and low costs; hence, they contribute to the development of vacuum electron sources for electron microscopes with submicron resolution. Their performance depends on oxide thickness, tip dimensions, electric field strength and vacuum level. Results will include an analysis of band diagrams, identification of sources of the emission current noise in relation to reliability, a model for optimal tip dimensions and development of optimal conditions for oxide layer growth in correlation with maximum emissivity and lifetime."@en . . . . "2013-12-31+01:00"^^ . . . . . . "Cold emission Physical model Band diagram 1/f noise Ions diffusion" . . "GAP102/11/0995" . . "1"^^ . "Electron transport, Noise and Diagnostic of Shottky and Autoemission Cathodes"@en . . "Projekt studuje transport, fluktua\u010Dn\u00ED jevy a nedestruktivn\u00ED diagnostiku autoemisn\u00EDch katod (AEK). C\u00EDlem je prozkoumat vlastnosti a chov\u00E1n\u00ED vrstev oxidu na wolframu a jemu bl\u00EDzk\u00FDch kovech, vytv\u00E1\u0159en\u00FDch lept\u00E1n\u00EDm. Bude zkoum\u00E1na stabilita elektronov\u00E9 emise do vakua, tvar V-A a \u0161umov\u00FDch charakteristik a emisn\u00ED divergence. Metodika v\u00FDzkumu je zalo\u017Eena na anal\u00FDze spektr\u00E1ln\u00ED hustoty \u0161umu p\u0159i prom\u011Bnn\u00E9 \u00FArovni vakua, teplot\u011B a intenzit\u011B elektrick\u00E9ho pole. V\u00FDzkum AEK je t\u011Bsn\u011B spjat s\u00A0rozvojem vakuov\u00FDch elektronov\u00FDch zdroj\u016F pro elektronov\u00E9 mikroskopy se submikronov\u00FDm rozli\u0161en\u00EDm. AEK maj\u00ED \u0159adu v\u00FDhod oproti \u017Ehaven\u00FDm katod\u00E1m, nap\u0159. vysok\u00E9 proudov\u00E9 hustoty, dobrou divergenci a n\u00EDzkou cenu. V\u00FDkon z\u00E1vis\u00ED na tlou\u0161\u0165ce oxidu formovan\u00E9ho anodickou oxidac\u00ED, na rozm\u011Brech hrot\u016F, elektrick\u00E9m poli a hladin\u011B vakua. V\u00FDsledkem v\u00FDzkumu bude anal\u00FDza p\u00E1sov\u00FDch diagram\u016F, identifikace zdroj\u016F \u0161umu emisn\u00EDho proudu ve vztahu ke spolehlivosti, model optim\u00E1ln\u00EDho rozm\u011Bru hrotu v\u00A0z\u00E1vislosti na elektrick\u00E9m poli a vakuu a\u00A0 metoda optim\u00E1ln\u00EDho r\u016Fstu oxidov\u00FDch vrstev v\u00A0korelaci s\u00A0maxim\u00E1ln\u00ED emis\u00ED a \u017Eivotnost\u00ED." . . "2013-06-12+02:00"^^ . "Cold emission Physical model Band diagram 1/f noise Ions diffusion,Oxide layer"@en . "http://www.isvav.cz/projectDetail.do?rowId=GAP102/11/0995"^^ . "2014-07-01+02:00"^^ . "0"^^ . . "55"^^ . . "Byly studov\u00E1ny fyzik\u00E1ln\u00ED a chemick\u00E9 vlastnosti s c\u00EDlem z\u00EDskat informace pot\u0159ebn\u00E9 k n\u00E1vrhu automatick\u00E9ho za\u0159\u00EDzen\u00ED pro p\u0159\u00EDpravu katod. Mezi z\u00EDskan\u00E9 v\u00FDsledky pat\u0159\u00ED mechanick\u00E9 vlastnosti leptan\u00FDch dr\u00E1t\u016F, chemick\u00E9 slo\u017Een\u00ED leptac\u00EDho roztoku a procesn\u00ED parametry leptac\u00EDho procesu. Bylo navr\u017Eeno a zkonstruov\u00E1no automatick\u00E9 leptac\u00ED za\u0159\u00EDzen\u00ED. Byla uplatn\u011Bna metoda zalo\u017Een\u00E1 na m\u011B\u0159en\u00ED \u0161umov\u00FDch vlastnost\u00ED."@cs . "55"^^ . "0"^^ . "During solution of the project were studied fundamental physical and chemical properties of the etching proces aimed at fabrication of autoemission electron cathodes. Among the acquired results were e.g. mechanical properties of etched wires, chemical solution of the etchant and parameters of the etching process. An automatic etching setup was designed, constructed and tested."@en . "Transport elektron\u016F, \u0161um a diagnostika Shottkyho a autoemisn\u00EDch katod" . . .