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Wyszukujesz frazę "Albert, D." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
Investigations on ZnSe/GaAs Interface by Treatment of GaAs (2×4) Surface with Te and Mg
Autorzy:
Ebel, R.
Spahn, W.
Ress, H. R.
Albert, D.
Schäfer, H.
Ehinger, M.
Faschinger, W.
Landwehr, G.
Powiązania:
https://bibliotekanauki.pl/articles/1950745.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Bd
68.65.+g
Opis:
The heterovalent interface ZnSe/GaAs, despite the small lattice misfit, still poses certain problems. The condition of the substrate surface prior to growth start determines the initial growth conditions, which on the other hand are assumed to be responsible for defect densities. Since Zn, in contrast to Se, hardly binds to GaAs the initial surface during growth start is essentially Se terminated. Therefore the binding of Mg to Se terminated GaAs was investigated. The structural quality of 140 nm thick ZnSe layers on different MgSe coverages were compared to conventionally grown and Te initiated ZnSe epilayers of the same thickness.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 767-772
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discussion of the “hottest year on record” in Australia
Autorzy:
Parker, Albert
Ollier, Clifford D.
Powiązania:
https://bibliotekanauki.pl/articles/1052494.pdf
Data publikacji:
2017-03-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
tem perature warming
urban heat island
Australia
extreme events
Opis:
The global temperature trends provided by the Australian Bureau of Meteorology are artificially exaggerated due to subjective and unidirectional adjustments of recorded values. The present paper aims to promote the use of the raw stations’ data corrected only for urban heat island formation. The longer temperature records of Australia exhibit significant oscillations with a strong quasi-60 years’ signature of downward phases 1880 to 1910, 1940 to 1970 and 2000 to present, and upwards phases 1910 to 1940 and 1970 to 2000. A longer oscillation with downward phase until 1910 and an upwards phase afterwards is also detected. The warming since 1910 occurred at a nearly constant rate. Over the full length of the long Australian records since the end of the 1800s, there is no sign of warming or increased occurrence of extreme events. The monthly highest and mean maximum temperatures do not exhibit any positive trend. The differences between monthly highest and lowest, or monthly mean maximum and mean minimum temperatures, are all reducing because of urban heat island formation.
Źródło:
Quaestiones Geographicae; 2017, 36, 1; 79-91
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elimination of Zinc from Aluminum During Remelting in an Vacuum Induction Furnace
Autorzy:
Smalcerz, Albert
Blacha, Leszek
Węcki, Bartosz
Desisa, D. G.
Łabaj, Jerzy
Jodkowski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2174631.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mass transfer coefficient
zinc evaporation
vacuum induction furnace
meniscus
współczynnik przenikania masy
odparowanie cynku
piec indukcyjny próżniowy
menisk
Opis:
In this paper, the results of the study on aluminium evaporation from the Al-Zn alloys (4.2% weight) during remelting in a vacuum induction furnace (VIM) are presented. The evaporation of components of liquid metal alloys is complex due to its heterogeneous nature. Apart from chemical affinity, its speed is determined by the phenomena of mass transport, both in the liquid and gas phase. The experiments were performed at 10-1000 Pa for 953 K - 1103 K. A significant degree of zinc loss has been demonstrated during the analysed process. The relative values of zinc loss ranged from 4 to 92%. Lowering the pressure in the melting system from 1000 Pa to 10 Pa caused an increase in the value of density of the zinc evaporating stream from 3.8210-5 to 0.000564 gcm-2s-1 at 953 K and 3.3210-5 to 0.000421 gcm-2s-1 for 1103 K. Based on the results of the conducted experiments. it was found that evaporation of zinc was largely controlled by mass transfer in the gas phase and only for pressure 10 Pa this process was controlled by combination of both liquid and gas phase mass transfer.
Źródło:
Archives of Foundry Engineering; 2022, 22, 3; 11--18
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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