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
Patera (planetary nomenclature) Patera (planetary nomenclature) Patera (plural: paterae) is an irregular crater, or a complex crater with scalloped edges on a celestial body. Paterae can have any origin (volcanic, impact or other), although majority of them were created by volcanism. The term comes from Latin language, where it refers to a shallow bowl used in antique culture. This term is used in planetary nomenclature: it is a part of the international names of such features. In such names, it is capitalized and stands after the proper given name (e.g., Pillan Patera). Besides that, it can be used as a description term and