MiniGRAIL: first spherical gravitational wave antenna in the world
Since last week, Professor Giorgio Frossati of Leiden University’s Institute of Physics can ‘listen’ to gravitational waves. That is, if such a wave happens to come along. Gravitational waves originate from violent clashes between black holes in the universe and from instabilities in neutron stars.
MiniGRAIL is the name of the first spherical gravitational wave antenna in the world. The ball was made at the Leiden Institute of Physics (LION) of Leiden University. It is the product of years of close cooperation between Frossati’s research group and the technicians of the fine-mechanic and electronic workshop in the Institute. “A result to be proud of”, says Professor Peter Kes, LION’s scientific director.
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Atomic clock experts from the Physikalisch-Technische Bundesanstalt (PTB) are the first research group in the world to have built an optical single-ion clock which attains an accuracy which had only been predicted theoretically so far. Their optical ytterbium clock achieved a relative systematic measurement uncertainty of 3 E-18. The results have been published in the current issue of the scientific journal "Physical Review Letters".
Atomic clock experts from the Physikalisch-Technische Bundesanstalt (PTB) are the first research group in the world to have built an optical single-ion clock...
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Physicists from Saarland University and the ESPCI in Paris have shown how liquids on solid surfaces can be made to slide over the surface a bit like a bobsleigh on ice. The key is to apply a coating at the boundary between the liquid and the surface that induces the liquid to slip. This results in an increase in the average flow velocity of the liquid and its throughput. This was demonstrated by studying the behaviour of droplets on surfaces with different coatings as they evolved into the equilibrium state. The results could prove useful in optimizing industrial processes, such as the extrusion of plastics.
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