Entre 1275 et 1361, la ville de Ronda, située en Andalousie, est une disputée entre les Nasrides Mérinides, qui font base leurs campagnes militaires péninsule Ibérique. Au temps frontière, Ronda frontalière, au système défensif hypertrophié où venus du Maghreb ou Grenade jouent un rôle fondamental. aussi murailles isolent uns des autres citadelle, faubourgs médina constituent autant lignes disc...

Na1/2La1/2)(Mg1/3Nb2/3)O3 undergoes a series of phase transitions that involve cation order on the Aand B-sites of the parent perovskite structure. At high temperatures both sites contain a random distribution of cations; below 1275°C a 〈111〉 layering of Mg and Nb leads to the formation of a 1:2 ordered structure with a monoclinic supercell. A second transition was observed at 925°C, where the ...

Aragão and Shimabukuro (Reports, 4 June 2010, p. 1275) reported that fires increase in agricultural frontiers even as deforestation decreases and concluded that these fires lead to unaccounted carbon emissions under the United Nations climate treaty's tropical deforestation and forest degradation component. Emissions from post-deforestation management activities are, in fact, included in these ...