English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Stirring a two-dimensional viscous fluid with rods is often an effective wayto mix. The topological features of periodic rod motions give a lower bound onthe topological entropy of the induced flow map, since material lines must`catch' on the rods. But how good is this lower bound? We present examples fromnumerical simulations and speculate on what affects the 'gap' between the lowerbound and the measured topological entropy. The key is the sign of the rodmotion's action on first homology of the orientation double cover of thepunctured disk.

Estimating topological entropy from the motion of stirring rods