Coherent light scattering by blue feather barbs

Article Abstract:

The spatial variation in refractive index of blue feather barbs of Continga maynana has been studied using a two-dimensional (2D) fourier analysis. It demonstrates that the colour is produced by interference between light waves coherently scattered by the keratin-air matrix of the barbs. There are similarities between the nanostructure of the medullary keratin of C. manyana and other structurally coloured feather barbs, suggesting that the structural greens, blues, violets and ultraviolet colours are also produced by constructive interference.

Feathers, Fourier analysis, Keratin

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Coherent moving states in highway traffic

Article Abstract:

Multiagent simulation research shows that road vehicles traveling along the highway interact in a coherent state which becomes correlated at higher traffic densities. Vehicles travel safely at similar speeds in a correlated state because few vehicles change lanes. No correlation exists above a critical traffic density. Evidence suggests that the European road system is less effective than its US counterpart.

Traffic engineering, Roads

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Source of coherent kiloelectronvolt X-rays

Article Abstract:

Generating X-rays that have the properties of laser light has been a longstanding goal for experimental science. A laboratory source of laser-like, kiloelectronvolt X-rays, which will operate on timescales relevant to many chemical, biological and materials problems, is now within reach.

X-rays, Properties, X-ray analysis, Laser materials

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