N1VUX is my FCC-issued ham radio callsign.
« Room-temperature ice is possible if the water molecules you’re freezing are submitted to a high enough electric field. » -- Physics News Update
- The Brillouin phenomena apparently involve group velocity, not actual FTL propagation of waves, just of group crests? One of the 3 Google News hits for this story says it's embargoed until Monday 2AM, but two others are out with it, and it's on the university website;... apparently the press release also travelled faster than the speed of light?
- Initially this sounds deceptively similar to the
above Swiss fiber-optic experiment, and both involve Brillouin
Scattering phenomena, but this actually quite
(1) Quasicrystals ( * ) are 3-dimensional analogs of the Penrose tiling ( * ), both of which seemingly violate the impossibility of 5-fold rotational symmetry -- counter-intuitively, 5-fold symmetry of a sort is possible in an aperiodic tiling . (Thus providing a simpler counter-example to Wang's conjecture , which held all tilings could be periodic.)
(2) This is a scaled experiment performed with macroscopic stereolithographic model(s) inspected with microwaves and RF network analyzers, instead of an actual light experiment in light media as with the Swiss study above.
(3) This study is identifying candidates for photonic band-gap nanomaterials, and thus is similar to the negative index of refraction materials.
- This again reminds me of Larry
Niven 's novels The Integral Trees and The Smoke
Ring novels, set in a physically plausible torus of atmosphere around a
(the physics are quite similar to those for space-tethers in use on
Note that phrase similar to Europa's -- whose atmospheric pressure is estimated at one-hundred-billionth of Earth's (*) and thus not breathable; what little there is would also be rather cold.
- Ordinary? Ordinary may be the wrong word
for un-barred in this case. The typical spiral galaxy
is barred. The non-barred spirals are
less typical, possibly
«Barred spiral galaxies are relatively common, with surveys showing that up to two-thirds of all spiral galaxies contain a bar.» - Wikipedia
«Researchers from Oxford University in England have tackled
the problem [of network optimization] by examining the congestion
costs within a network model that combines paths that go around the
perimeter of the network and central hubs that provide shorter paths
through the network. Real-world networks are too complicated to
describe exactly mathematically. The researchers' model is simple
enough to solve exactly, yet realistic enough to provide insights into
The research is aimed at finding ways to ease bottlenecks in networks involving manufacturing, the Internet and traffic, and ways to disrupt networks like tumor blood flow and terrorist supply chains. The findings could also help design better networks. » [OU]
- That adding a road may increase congestion is not a new result: traffic modellers were aware of this in 1980 if not before.