Directional solidification at high speed. I. Secondary instabilities

Cellular instabilities in directional solidification

2014 We have studied the morphology of the solid-liquid interface during the directional solidification of thin (5-150 03BCm) samples of a dilute binary mixture (CBr4/~ 0.1 % Br2) . Above a critical pulling speed, for a given temperature gradient and solute concentration, the interface, initially planar, breaks down into a periodic cellular pattern. The bifurcation from a planar to a cellular s...

I ) Progress Report on Directional Solidification of AI 2

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Onset of sidebranching in directional solidification.

We use a computationally efficient phase-field formulation [B. Echebarria, Phys. Rev. E 70, 061604 (2004)] to investigate the origin and dynamics of sidebranching in directional solidification for realistic parameters of a dilute alloy previously studied experimentally [M. Gorgelin and A. Pocheau, Phys. Rev. E 57, 3189 (1998)]. Sidebranching is found to result either from noise amplification or...

Secondary Hardening in High Speed Steels

Double-directional radio channel estimation at 2GHz for high speed vehicular mobiles - Experimental results

Results obtained from a high speed outdoor field trial in the 2GHz band are presented. The aim of this contribution is to characterize double directional radio propagation apt for MIMO (Multiple Input Multiple Output) systems in quite an unusual environment. From the Wideband measurements we estimate the delays, arrival and departure angles using two multiplexed antenna arrays, one circular and...