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Yet, before the experiments of Stanciu and Hansteen, all-optical controllable magnetization reversal in a stable magnetic state was considered impossible. [ 1 ] In quantum field theory and quantum chemistry the effect where the angular momentum associated to the circular motion of the photons induces an angular momentum in the electrons is ...
A sconce or wall light is a decorative light fixture that is mounted to a wall. [1] The sconce is a very old form of fixture, historically used with candles and oil lamps. They can provide general room lighting, and are common in hallways and corridors, but they may be mostly decorative. [1] A sconce may be a traditional torch, cresset, candle ...
Paramagnetic materials have a weak induced magnetization in a magnetic field, which disappears when the magnetic field is removed. Ferromagnetic and ferrimagnetic materials have strong magnetization in a magnetic field, and can be magnetized to have magnetization in the absence of an external field, becoming a permanent magnet. Magnetization is ...
Lighting of sensitive prints should be limited to 50 lux (5 foot-candles) or less and artificial lights can be equipped with UV-filtering sleeves or tubes. [18] Prints onto animal skins should also be maintained at a humidity level between 25% and 40%. [19] Prints onto silk are particularly sensitive to any light including camera flashes. [20]
[5] [6] In the earlier periods, the term "candlestick", chandelier in France, may be used to refer to a candelabra, a hanging branched light, or a wall light or sconce. In English, "hanging candlesticks" or "branches" were used to mean lighting devices hanging from the ceiling until chandelier began to be used in the 18th century. [7]
Ultraviolet-filtered, Plexiglas-glazed frames do little to protect woodblock prints from light damage over time. Museums often limit the display of woodblock prints, such as not exposing them to light for more than three weeks at light levels of 50 lux and keep relative humidity at 50 percent ± 5 percent. It is recommended to slowly acclimate ...