Scientists have discovered that greater mouse - eared bats
use polarisation patterns in the sky to navigate — the first mammal that's known to do this.
«We know that other animals
use polarisation patterns in the sky, and we have at least some idea how they do it: bees have specially - adapted photoreceptors in their eyes, and birds, fish, amphibians and reptiles all have cone cell structures in their eyes which may help them to detect polarisation,» says Dr Richard Holland of Queen's University Belfast, co-author of the study.
Scientists have even shown that dung beetles
use the polarisation pattern of moonlight for orientation.
Much like Nokia's ClearBlack tech, the Cupertino - based company has
used a polarisation filter to reduce the glare.
Not exact matches
A team of astrophysicists had
used the BICEP2 South Pole telescope to identify a pattern in the
polarisation maps of the cosmic microwave background radiation (rather like an echo of the Big Bang).
He noted that, «Military adventurists have often
used the excuse of political
polarisation to destabilise democratically - elected governments but that was often a smokescreen to avoid wider accountability.»
In addition to the observations with the SINFONI instrument the team has also made a long series of measurements of the
polarisation of the light coming from the supermassive black hole region
using the NACO instrument on the VLT.
The new study shows the shrimp
use circular
polarisation as a means to covertly advertise their presence to aggressive competitors.
Now a team has
used data from the Integral satellite, run by the European Space Agency (ESA), to study an entirely different effect: the
polarisation of light of different energies from a GRB.
Mick Gleave of the BBC's engineering information department says: «If you
use right - hand circular
polarisation, the reflection becomes left - hand polarised, so you can distinguish the direct and reflected signals.»
More recently, the BBC has been
using antennas which transmit circularly polarised signals, in which the direction of
polarisation rotates over time.