This is because their wavelength of 1064
nanometres means they are absorbed by the leaves and other organic matter such as oil, but not by metal, so energy from the lasers is reflected off the rails.
Not exact matches
All of the air filters that were tested effectively removed nanocluster particles smaller than 3
nanometres, which
means that particles of this size are unlikely to enter indoor areas.
Now researchers at ETH Zurich have designed a memristor device out of perovskite just 5
nanometres thick that has three stable resistive states, which
means it can encode data as 0,1 and 2, or a «trit» as opposed to a «bit.»
In the Alubeam paint production process, the particles are much finer and have a diameter of only 30 to 50
nanometres, which
means that particles are integrated more evenly into the paint surface.
Apparently those leaked specs in June were spot on, which would
mean a specially built ARM multicore chip clocked at 3.1 GHz with a custom 28
nanometre graphics processor by graphic specialists AMD and 5 GB of RAM.
For comparison I've seen the Knudsen layer described as «several
mean free paths thick» which in the atmosphere is about 70
nanometres and would be much less in water.
The
mean free path of a molecule in air is about 65
nanometres.
And the
mean free path of a molecule in air is about 65
nanometres.