منابع مشابه
Secondary instabilities of hexagonal patterns in a Bénard-Marangoni convection experiment.
We have identified experimentally secondary instability mechanisms that restrict the stable band of wave numbers for ideal hexagons in Bénard-Marangoni convection. We use "thermal laser writing" to impose long wave perturbations of ideal hexagonal patterns as initial conditions and measure the growth rates of the perturbations. For epsilon=0.46 our results suggest a longitudinal phase instabili...
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We investigate the electronic and cohesive properties of the hexagonal and cubic Laves phases of Fe2Ti by ab initio band structure calculations. In particular the stability range of these compounds is studied. In the volume range considered, the state of lowest energy is hexagonal (C14) and exhibits antiferromagnetic order. However, we find a slightly higher in energy lying ferromagnetic state ...
متن کاملPhase Instabilities in Small Particles
In this review we consider the existing theories for the structure of small particles and the nature of morphological instabilities as the size is reduced. The various electron microscopic observations confirming the stability of a new phase, the so called ‘Multiply twinned structure’, in small particles is discussed. A theoretical model is presented to calculate the free energy surfaces for a ...
متن کاملSpatial period - multiplying instabilities of hexagonal Faraday waves
A recent Faraday wave experiment with two-frequency forcing reports two types of 'superlattice' patterns that display periodic spatial structures having two separate scales [1]. These patterns both arise as secondary states once the primary hexagonal pattern becomes unstable. In one of these patterns (so-called 'superlattice-two') the original hexagonal symmetry is broken in a subharmonic insta...
متن کاملHexagonal convection patterns in atomistically simulated fluids.
Molecular dynamics simulation has been used to model pattern formation in three-dimensional Rayleigh-Bénard convection at the discrete-particle level. Two examples are considered, one in which an almost perfect array of hexagonally shaped convection rolls appears, the other a much narrower system that forms a set of linear rolls; both pattern types are familiar from experiment. The nature of th...
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ژورنال
عنوان ژورنال: Europhysics Letters (EPL)
سال: 1998
ISSN: 0295-5075,1286-4854
DOI: 10.1209/epl/i1998-00315-2