Solidification of Al alloys under electromagnetic pulses and characterization of the 3D microstructures under synchrotron x-ray tomography

A novel programmable electromagnetic pulse device was developed and used to study the solidification of Al-15 pct Cu and Al-35 pct Cu alloys. The pulsed magnetic fluxes and Lorentz forces generated inside the solidifying melts were simulated using finite element methods, and their effects on the solidification microstructures were characterized using electron microscopy and synchrotron X-ray tomography. Using a discharging voltage of 120 V, a pulsed magnetic field with the peak Lorentz force of ~1.6 N was generated inside the solidifying Al-Cu melts which were showed sufficiently enough to disrupt the growth of the primary Al dendrites and the Al2Cu intermetallic phases. The microstructures exhibit a strong correlation to the characteristics of the applied pulse, forming a periodical pattern that resonates the frequency of the applied electromagnetic field

Classification of Metal-Deficient Dwarfs in the Vilnius Photometric System

Methods used for the quantitative classification of metal-deficient stars in the Vilnius photometric system are reviewed. We present a new calibration of absolute magnitudes for dwarfs and subdwarfs, based on Hipparcos parallaxes. The new classification scheme is applied to a sample of Population II visual binaries

Classification of metal-deficient dwarfs in the Vilnius photometric system

Bibliogr. str. galeVilniaus universiteto Teorinės fizikos ir astronomijos institutasVytauto Didžiojo universitetasŠvietimo akademij

T 125 AUTOMATIZAVIMAS, ROBOTOTECHNIKA Train Traffic Simulation with Coloured Petri Nets and Schedule

The basis of train traffic organization is a traffic schedule which should fulfill certain conditions (times of departure and arrival, overall duration of the journey, etc.) and be optimal according to a certain criterion (minima

Ammonia toxicity in Scots Pine stands growing in the area affected by the Nitrogen Fertilizer factory

Vytauto Didžiojo universitetasŽemės ūkio akademij