The electrostatic charge that is generated when two materials are contacted or rubbed and
then separated is a well-known physical process that has been studied for more than 2500 …

Studies of the respiratory health effects of different types of volcanic ash have been
undertaken only in the last 40 years, and mostly since the eruption of Mt. St. Helens in 1980 …

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It is known that contact-electrification (or triboelectrification) usually occurs between two
different materials, which could be explained by several models for different materials …

Abstract The December 1989–June 1990 eruption of Redoubt Volcano affected commercial
and military air operations in the vicinity of Anchorage, Alaska. These effects were due to the …

The 26.5 ka Oruanui eruption, from Taupo volcano in the central North Island of New
Zealand, is the largest known 'wet'eruption, generating 430km3 of fall deposits, 320km3 of …

The electrification of volcanic ash plumes and the occurrence of volcanic lightning are now
known to be common phenomena during explosive volcanic eruptions. This knowledge …

Tephra in plumes can scavenge and thereby rapidly deposit volatiles including sulphur,
halogen and metal species. These may then be leached (eg by rainfall), potentially …

Triboelectric charging occurs in granular insulating systems even when all particles are
composed of identical material. A simple model is used here to address triboelectric …

Models for same-material contact electrification in granular media often rely on a local
charge-driving parameter whose spatial variations lead to a stochastic origin for charge …