929 research outputs found
Contained Mobility and the Racialization of Poverty in Europe: The Roma at the Development-Security Nexus
Knowing “the Roma”: Visual technologies of sorting populations and the policing of mobility in Europe
Experimental stabilisation of 2D vortex patterns using time-dependent forcing
Experimental results of the effect of time-periodic and "chirped" (electro-magnetic) forcing on vortex patterns in shallow-water-layer flows are presented. Analogously to vibrational control, the use of a time-periodic forcing results in stabilisation of otherwise unstable vortex patterns. Chirped frequency forcing yields self-organising patterns that are different from those in stationary and periodically forced experiments. The results are shown to be consistent with theoretical analysis of 2D Taylor-Green vortices, i.e. unstable analytical solutions of the 2D Navier-Stokes equation. These results imply that, compared to the more often analysed stationary forced flows, time-varying forcing can stabilise different vortex patterns in shallow-water-layer flows
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