indirect transition
121Light-emitting diode — LED redirects here. For other uses, see LED (disambiguation). Light emitting diode Red, pure green and blue LEDs of the 5mm diffused type Type Passive, optoelectronic Working principle Electr …
122High-temperature superconductivity — Unsolved problems in physics What causes superconductivity at temperatures above 50 kelvin? High temperature superconductors (abbreviated high Tc or HTS) are materials that have a superconducting transition temperature (Tc) above 30 K… …
123Black carbon — or BC is formed through the incomplete combustion of fossil fuels, biofuel, and biomass, and is emitted in both anthropogenic and naturally occurring soot. Black carbon warms the planet by absorbing heat in the atmosphere and by reducing albedo,… …
124Historical powers — include great powers, nations, or empires in history. The term Great power represent the most important world powers. In a modern context, recognised great powers came about first in Europe during the post Napoleonic era.[1] The formalization of… …
125Riding aids — A rider with a well balanced, independent seat, allowing her to give precise aids. Riding aids are the cues a rider gives to a horse to communicate what they want the animal to do. Riding aids are broken into the natural aids and the artificial… …
126Liberal democracy — Part of the Politics series Democracy History · Vari …
127Histoire De Cuba — Cuba, la plus grande des îles des Caraïbes, était tout d abord habitée par des peuples indigènes, connus sous les noms de Taïnos et Ciboneys. Le 27 octobre 1492, Christophe Colomb aperçut l île lors de son premier voyage et la… …
128Histoire de Cuba — Les premiers habitants de Cuba, la plus grande des îles des Caraïbes, était les Taïnos et Ciboneys. Le 27 octobre 1492, Christophe Colomb aperçut l île lors de son premier voyage et la revendiqua au nom de l Espagne. Cuba fit dès lors… …
