power transformers are key components in electrical power supplies and their failure could cause severe consequences on continuity of service and also generates substantial costs. identifying problems at an early stage, before catastrophic failure occurs, is a great benefit for reliable operation of power transformers. frequency response analysis (fra) is a new, well-known and powerful diagnost...

A simple model demonstrates that there is no theoretical connection between the extent of price discrimination and the extent of market power. D 2006 Elsevier B.V. All rights reserved.

Mass, an inherent property of matter, is calculated directly for the photon particle from very classical principles kinetic theory gases. That concept mass nearly as old physics itself and in fact nothing prevents this approach to be carried out a so-called quantum particle, not even its minute size. It end result with no perspective nor other outcome. Quite opposite, single ponderable tiny fre...