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3rd order rainbow image
Higher order rainbows were photographed for first time in nature by M. Großmann in Germany
optics  dispersion  image 
may 2016 by darthsunshine
Magnetic hyperbolic optical metamaterials : Nature Communications : Nature Publishing Group
New metamaterial allows conversion of wideband IR into enhanced narrowband IR, suitable for TPV and atmospheric heat rejection to space.
magnetic  hyperbolic  dispersion  metamaterial  materials  science  research  technology  nanotechnology  lens  filter  frequency  concentrator  IR  TPV  thermophotovoltaic  converter  narrowband  emitter  Delicious 
april 2016 by asteroza
Hata model for urban areas - Wikipedia, the free encyclopedia
In wireless communication, the Hata model for urban areas, also known as the Okumura–Hata model for being a developed version of the Okumura model, is the most widely used radio frequency propagation model for predicting the behaviour of cellular transmissions in built up areas. This model incorporates the graphical information from Okumura model and develops it further to realize the effects of diffraction, reflection and scattering caused by city structures. This model also has two more varieties for transmission in suburban areas and open areas.[1]

Hata Model predicts the total path loss along a link of terrestrial microwave or other type of cellular communications.
g017  hatamodel  radio  dispersion  frequency  range  packeterror 
april 2016 by juliantait

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