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Wyszukujesz frazę "Andrzejczak, C." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
The Identification of Factors Contributing to Self-Reported Anomalies in Civil Aviation
Autorzy:
Andrzejczak, C.
Karwowski, W.
Thompson, W.
Powiązania:
https://bibliotekanauki.pl/articles/90652.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
self-reported anomalies
civil aviation
human factors
pilot error
text mining
correspondence analysis
czynnik ludzki
lotnictwo cywilne
błąd pilota
analiza tekstu
Opis:
The main objective of this study was to analyze anomalies voluntarily reported by pilots in civil aviation sector and identify factors leading to such anomalies. Experimental data were obtained from the NASA aviation safety reporting system (ASRS) database. These data contained a range of text records spanning 30 years of civilian aviation, both commercial (airline operations) and general aviation (private aircraft). Narrative data as well as categorical data were used. The associations between incident contributing factors and selfreported anomalies were investigated using data mining and correspondence analysis. The results revealed that a broadly defined human factors category and weather conditions were the main contributors to selfreported civil aviation anomalies. New associations between identified factors and reported anomaly conditions were also reported.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 1; 3-18
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Benefit Effect of Low Addition Yttrium on the Phase αMg and eutectic αMg+γ(Mg17Al12) in AZ91 Alloy
Autorzy:
Mikusek, D.
Rapiejko, C.
Andrzejczak, A.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/2049625.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnesium alloy AZ91
yttrium
grain refining
solidification process
investment casting
Opis:
This paper presents results of a study of the effect of inoculation of yttrium on the microstructure of AZ91 alloy. The concentration of the inoculant was increased in samples in the range from 0.1% up to 0.6%. The influence of Y on the thermal effects resulting from the phase transformations occurring during the crystallisation at different inoculant concentrations were examined with the use of Derivative and Thermal Analysis (DTA). The microstructures of the samples were examined with the use of an optical microscope; and an image analysis with a statistical analysis were also carried out. Those analyses aimed at examining oh the effect of inoculation of the Y on the differences between the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared examined material as well as the average size of each type of grain by way of measuring their perimeters.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 57-63
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Inoculant Emgesal® Flux 5 on the Microstructure of Magnesium Alloy AZ91
Autorzy:
Rapiejko, C.
Mikusek, D.
Andrzejczak, A.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/380314.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
solidification process
magnesium alloys
Emgesal® Flux 5
DTA process
metalografia
proces krzepnięcia
stopy magnezu
testy DTA
Opis:
This work presents the results of the research of the effect of the inoculant Emgesal Flux 5 on the microstructure of the magnesium alloy AZ91. The concentration of the inoculant was increased in samples in the range from 0.1% to 0.6%. The thermal processes were examined with the use of Derivative and Thermal Analysis (DTA). During the examination, the DTA samplers were preheated up to 180 °C. A particular attention was paid to finding the optimum amount of inoculant, which would cause fragmentation of the microstructure. The concentration of each element was verified by means of a spark spectrometer. In addition, the microstructures of the samples were examined with the use of an optical microscope, and an image analysis with a statistical analysis using the NIS-Elements program were carried out. Those analyses aimed at examining the differences between the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared samples as well as the average size of each type of grain by way of measuring their perimeters. This paper is an introduction to a further research of grain refinement in magnesium alloys, especially AZ91. Another purpose of this research is to achieve better micro-structure fragmentation of magnesium alloys without the related changes of the chemical composition, which should improve the mechanical properties.
Źródło:
Archives of Foundry Engineering; 2019, 2; 15-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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