Iron based high temperature superconductors have several common features with superconducting cuprates, including the square lattice and the proximity to an antiferromagnetic phase. Themagnetic excitation spectrumbelowTc of Fe Te Se 1.02 0.7 0.3 shows an hourglass-shaped dispersionwith a resonance around the commensurate point . In a previous inelastic neutron scattering study, we showed that t...

The developmental hourglass model has been used to describe the morphological transitions of related species throughout embryogenesis. Recently, quantifiable approaches combining transcriptomic and evolutionary information provided novel evidence for the presence of a phylotranscriptomic hourglass pattern across kingdoms. As its biological function is unknown it remains speculative whether this...

In this paper, we define the class of hourglass automata, which are timed automata with bounded clocks that can be made to progress backwards as well as forwards at a constant rate. We then introduce a new clock update for timed automata that allows hourglass automata to be expressed. This allows us to show that language emptiness remains decidable with this update when the number of clocks is ...

Septins perform diverse functions through the formation of filaments and higher-order structures. However, the exact architecture of septin structures remains unclear. In the budding yeast Saccharomyces cerevisiae, septins form an 'hourglass' at the mother-bud neck before cytokinesis, which is converted into a 'double ring' during cytokinesis. Here, using platinum-replica electron microscopy, w...