Los dos pactos sellados por Guacanagarí y Cristóbal Colón en diciembre de 1492.

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El sometimiento del cacique de Port de Paix (Haití) a los Reyes Católicos en el primer viaje de Cristóbal Colón (diciembre de 1492)

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Hybrid classical-quantum formulations ask for hybrid notions

We reappraise some of the hybrid classical-quantum models proposed in the literature with the goal of retrieving some of their common characteristics. In particular, first, we analyze in detail the Peres-Terno argument regarding the inconsistency of hybrid quantizations of the Sudarshan type. We show that to accept such hybrid formalism entails the necessity of dealing with additional degrees of freedom beyond those in the straight complete quantization of the system. Second, we recover a similar enlargement of degrees of freedom in the so-called statistical hybrid models. Finally, we use Wigner's quantization of a simple model to illustrate how in hybrid systems the subsystems are never purely classical or quantum. A certain degree of quantumness (classicality) is being exchanged between the different sectors of the theory, which in this particular unphysical toy model makes them undistinguishable.Comment: 13 pages, 3 figures (minor changes to match the published version

La serpiente y el jaguar: su interpretación en una escultura choluiteca.

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Historiografía de los queros, pajchas y otras vasijas lígneas andinas de época incaica y colonial del Museo de América (Madrid)

Este articulo analiza les diferentes estudios que han tratado de los `queros', `pajehas' y otros recipientes de madera del Area Central Andina de la época Inca y colonial que se encuentran en el Museo de América de Madrid.This artiele analyse different werks abeul `queros', `pajchas' and elber types of wood receptacles of the Central Andean Aren. These receptacles date frem the Inca and Colonial periods, and are located al Ihe Museo de América, in Madrid

Una propuesta a la Corona para extender la mita y el tributo a negros, mestizos y mulatos (Ecuador, 1735 - 1748)

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La entrada en religión (1739) de Pedro Martínez de Arizala, oidor de la Audiencia de Quito, y sus consecuencias.

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Segregation-induced grain boundary electrical potential in ionic oxide materials: A first principles model

A first principles continuum analytical model for cationic segregation to the grain boundaries in complex ceramic oxides is presented. The model permits one to determine the electric charge density and the segregation-induced electric potential profiles through the grain and can be extrapolated to the range of nanostructured grain sizes. The theoretical predictions are compared with existing data for yttria-stabilized tetragonal zirconia polycrystals. The implications for physical properties (mainly high temperature plasticity and hardening behaviour) are then discussed.Gobierno de España MAT2009-14351-C02-01, MAT2009-14351-C02-0

Cristóbal Colón y la estructura sociopolítica indígena antillana durante el «Primer Viaje»: del silenciamiento al pacto.

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