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Wyświetlanie 1-10 z 21
Tytuł:
Competitive Nucleation in Grey Cast Irons
Autorzy:
Arab, N.
Powiązania:
https://bibliotekanauki.pl/articles/382159.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron
competitive nucleation
undercooling
cooling curve
grain refining
żeliwo
nukleacja
przechłodzenie
krzywa krzepnięcia
rozdrabnianie ziarna
Opis:
Cast irons are good examples of materials which are more sensitive to chemical composition and production conditions. In this research to improve casting quality, solidification and nucleation process in grey cast iron was investigate. In particular, attempts have been made to rationalize variation in eutectic cells with nucleation sites and eutectic solidification undercooling. Four castings with different diameter and similar chemical composition and pouring temperature and different inoculant percentage was casted. The cooling curve and maximum and minimum undercooling for each castings was measured. Also optical metallography and image analyzer has been used to determine the average eutectic cells diameter, and linear and surface densities, and volume density was calculated. The results of this research show a competitive behavior between nucleation sites and eutectic undercooling. Higher nucleation sites and higher eutectic undercooling cause higher eutectic cell density. But increasing nucleation sites by introducing inoculants to molten metal, is accompanied with reduction in eutectic undercooling. It means that inoculation and undercooling have opposite effect on each other. So, to achieve maximum cell density, it is necessary to create an optimization between these parameters.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 185-189
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the Elaboration Conditions on the Structural, Morphological and Luminescence Properties of ZnO Nanopowders
Autorzy:
Arab, L.
Guergouri, K.
Powiązania:
https://bibliotekanauki.pl/articles/1401219.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Dz
81.07.Wx
81.20.Fw
07.57.Ty
78.55.Qr
68.37.Hk
Opis:
Pure ZnO nanopowders were synthesized by the sol-gel method, which has several advantages, among which we include, achieving low temperature deposition and synthesis of new hybrid organo-mineral materials. The effect of the elaboration conditions (the elaboration concentrations ratio of precursors $(C_{Z}//C_{A})$, the gelling temperature $(T_g)$ and the gelling time $(t_g)$) on the structural, morphological and luminescence properties of ZnO nanopowders has been investigated. The chemical composition of the powders, determined by FTIR spectroscopy, indicate the exclusive presence of Zn-O bonds, as it is shown by the XRD spectra. The XRD results indicate also that the synthesized ZnO powder is a solid solution, crystallizing in pure würtzite structure with a minimum grain size of about 23 nm for the powders prepared using: $C_{Z}//C_{A}$=0.06%, $T_g$=130°C and $T_g$=4 h. The morphological aspect, given by the SEM images, revealed that the powders are made of sheets, consisting of small particles agglomerated together. The photoluminescence study of the ZnO powders shows spectra with luminescence peaks from green to ultraviolet light, the more intensive emission is connected to the peaks of the blue luminescence.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 940-942
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Humour and belonging: a thematic review
Autorzy:
Arab, Reza
Milner Davis, Jessica
Powiązania:
https://bibliotekanauki.pl/articles/2098506.pdf
Data publikacji:
2022-08-11
Wydawca:
Krakowskie Towarzystwo TERTIUM
Tematy:
humour
laughter
belonging
inclusion
exclusion
Opis:
Serving as introduction to this Special Issue, this article presents a thematic review of topics involved in studies on humour and belonging. It briefly elaborates on the intricacies of concepts such as humour, sense of humour and belonging and their relationships. It then provides a selective review of some major relevant studies. Finally, the themes and contents of the Special Issue are introduced.
Źródło:
The European Journal of Humour Research; 2022, 10, 2; 1-13
2307-700X
Pojawia się w:
The European Journal of Humour Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 21

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