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Determination of Al-Mg-Si alloy deformation resistance curves

Bilik J., Balazova M.

Hutnik, Wiadomości Hutnicze

2014

Vol. 81, nr 8

519--522

The paper is focused on determination of Al-Mg-Si alloy deformation resistance curves at room temperature and at 200, 300, 400 and 500°C with deformation rate 5 s-1. Plastometer Gleeble 3800 was used for obtaining the curves. The curves were determined as addition into Super-Forge 3D simulation software database. The measured deformation resistance curves enable more precise solution of required energy and force for cold or hot forming of Al-Mg-Si alloy.

Niniejsza praca koncentruje się na określeniu oporu kształtowania stopu Al-Mg-Si w temperaturze pokojowej oraz w temperaturach 200, 300, 400 oraz 500°C i prędkości odkształcenia 5 s-1. Plastometr Gleeble 3800 został użyty celem uzyskania krzywych. Krzywe zostały określone jako dodatek do bazy danych oprogramowania komputerowego symulacji SuperForge 3D. Zmierzona odporność krzywej odkształcenia pozwoliła na dokładniejsze rozwiązania służące do wyznaczenia potrzebnej energii i siły aby formować stop Al-Mg-Si na zimno i na gorąco.

Diversity and abundance of bird communities in three mountain forest stands : effect of the habitat heterogeneity

Balaz M., Balazova M.

Polish Journal of Ecology

2012

Vol. 60, nr 3

629-634

The structural composition of the forest habitats is considered to be one of the most important factors affecting the breeding bird community composition. Structurally more homogenous forests are usually characterized by lower number of bird species and their densities. This study presents results of a comparison of the breeding bird communities in three Carpathian mountain forests, and the effect of the forest composition on breeding bird species richness and density. There are the bird communities occurring in semi-natural forests: natural mixed forest (NMF) - spruce-beech forest situated ca. 1000 m a.s.l. and UFZ-spruce forest in the upper forest zone (UFZ) up to 1510 m a.s.l., and the managed spruce forest (MSF) at altitude which is similar to NMF. The territory mapping method was used to estimate the number of breeding species and their densities during years 2004-2006. The species richness as well as the density of breeding bird communities were found to be higher in the semi-natural habitats (33 breeding species; 64.6 breeding pairs 10[^-1] ha in NMF and 28 breeding species; 57.6 breeding pairs 10[^-1] ha in UFZ) than in the managed habitat (21 breeding species; 53.6 breeding pairs 10[^-1] ha). This was true even for the high-elevated study plot despite the fact that the altitude is usually negatively correlated with both the species richness and density.