Brush discharge plastics. The ability of an electrical discharge to cause an explosion in flammable atmospheres is measured by the "effective energy" of the discharge. The effective energy of brush discharges is 10-20 mJ, much larger than that of corona discharges 0.1 mJ. Therefore, brush discharges are considered an explosion hazard, while corona discharges are not. Brush discharges can occur from charged insulating plastics (for example polythene) to a conductor. Brush discharge A brush discharge is an electrical disruptive discharge similar to a corona discharge that takes place at an electrode with a high voltage applied to it, embedded in a nonconducting
Planetary health understanding and addressing the human health implications of accelerating change in the structure and function of Earth's natural systems." The Alliance's initiatives include the Rockefeller Foundation Planetary Health Fellowship, a planetary health course for Harvard undergraduates, and a Planetary Health Annual Meeting, which was first held in April 2017 in Boston, MA. The open-access journal "Lancet Planetary Health" published its inaugural issue in April 2017. Planetary health Planetary health refers to "the health of human civilization and the state of the natural systems on which it depends". In 2015, the Rockefeller Foundation and "The Lancet" launched the concept as the