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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 ...
[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.
Early studies in plasmas, [5] paramagnetic solids, [4] dielectric magnetic materials [6] [7] and ferromagnetic semiconductors [8] demonstrated that excitation of a medium with a circularly polarized laser pulse corresponds to the action of an effective magnetic field. Yet, before the experiments of Stanciu and Hansteen, all-optical controllable ...
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 ...
The magnetic anisotropy of a benzene ring (A), alkene (B), carbonyl (C), alkyne (D), and a more complex molecule (E) are shown in the figure. Each of these unsaturated functional groups (A-D) create a tiny magnetic field and hence some local anisotropic regions (shown as cones) in which the shielding effects and the chemical shifts are unusual.
In the magnetic pole model, the magnetic dipole moment is due to two equal and opposite magnetic charges that are separated by a distance, d. In this model, m is similar to the electric dipole moment p due to electrical charges: m = q m d , {\displaystyle m=q_{\mathrm {m} }d,} where q m is the ‘magnetic charge’.