Origin of oscillons

Article Abstract:

Oscillons are strong nonlinear electrostatic oscillations on the boundary of the plasma. The solutions of the cold electron fluid, Maxwell equation and the conditions of the plasma boundary determine these electrostatic oscillations of the surface fields. The oscillons have a rare spatial pattern. The frequency of the oscillons is in accordance to an algebraic dispersion relation dependent on the radius and peak amplitude of the oscillon. The term oscillons is suitable for defining this phenomena, since it involves oscillations of surface patterns.

Analysis, Reports, Electrostatics, Oscillation, Oscillations, Surface energy

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The origin of harmonic tremor at Old Faithful geyser

Article Abstract:

The interaction of seismic waves with sharp pressure pulses inside the Old Faithful geyser generates harmonic tremors. The measurement of time-resolved pressure variation inside the geyser, and passive broadband and short-period seismicity around the Old Faithful geyser, indicate that the pressure sources are impulsive and the harmonic tremor is a path effect. The harmonic resonance takes place in the medium between the source and the receiver. The pressure pulse originates at the top of the water column in the coolest region.

Research, Seismic waves

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Harmonic pictures in a flash

Article Abstract:

Scientists have combined the advantages of lensless imaging with advances in laser-driven X-ray generation to overcome the problem of spatial resolution, while preserving the laser's innate speed.

Methods, Usage, Image processing, Imaging systems, Imaging technology, X-ray analysis

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