Where surface physics and fluid dynamics meet: rupture of an amphiphile layer by fluid flow

We investigate the fluctuating pattern created by a jet of fluid impingent upon an amphiphile-covered surface. This microscopically thin layer is initially covered with 50 $\mu$m floating particles so that the layer can be visualized. A vertical jet of water located below the surface and directed upward drives a hole in this layer. The hole is particle-free and is surrounded by the particle-laden amphiphile region. The jet ruptures the amphiphile layer creating a particle-free region that is surrounded by the particle-covered surface. The aim of the experiment is to understand the (fluctuating) shape of the ramified interface between the particle-laden and particle-free regions.Comment: published in Journal of Chemical Physic

Fluctuation and Dissipation in Liquid Crystal Electroconvection

In this experiment a steady state current is maintained through a liquid crystal thin film. When the applied voltage is increased through a threshold, a phase transition is observed into a convective state characterized by the chaotic motion of rolls. Above the threshold, an increase in power consumption is observed that is manifested by an increase in the mean conductivity. A sharp increase in the ratio of the power fluctuations to the mean power dissipated is observed above the transition. This ratio is compared to the predictions of the fluctuation theorem of Gallavotti and Cohen using an effective temperature associated with the rolls' chaotic motion.Comment: 4 pages, 3 figures, revtex forma

Turbulence in a free surface

We report an experimental and numerical study of turbulent fluid motion in a free surface. The flow is realized experimentally on the surface of a tank filled with water stirred by a vertically oscillating grid positioned well below the surface. Particles floating on the surface are used to visualize the flow. The effect of surface waves appears to be negligible. The flow is unconventional in that it is confined to two dimensions but does not have squared vorticity as a conservation law, that it is not divergence free and that it inherits scaling features of the mean square velocity differences S_2(R) and the vorticity fluctuations Omega(R) from the bulk 3-d turbulence.Comment: 4 pages, 4 Postscript figure

The contested place of religion in the Australian Civics and Citizenship curriculum: exploring the secular in a multi-faith society

In the absence of a dedicated subject for teaching general religious education, the inclusion of Civics and Citizenship education as a new subject within the first Federal Australian Curriculum provides an important opportunity for teaching the religious within Australian schools. The curriculum for Civics and Citizenship requires students to learn that Australia is both a secular nation and a multi-faith society, and to understand religions practiced in contemporary Australia. The term "secular" and the need for students to learn about Australia’s contemporary multi-faith society raise some significant issues for schools and teachers looking to implement Civics and Citizenship. Focusing on public (state-controlled) schools, the argument here draws on recent analysis within the Australian context (Byrne, 2014; Maddox, 2014) to suggest that religion remains an important factor in understanding and shaping democratic citizenship in Australia, that this should be acknowledged within public schools, and that a constructivist, dialogical-based pedagogy provides possibilities for recognising the religious within Civics and Citizenship education