89 resultados para Ciències naturals-Obres de divulgació


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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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The formation of coherently strained three-dimensional (3D) islands on top of the wetting layer in the Stranski-Krastanov mode of growth is considered in a model in 1 + 1 dimensions accounting for the anharmonicity and nonconvexity of the real interatomic forces. It is shown that coherent 3D islands can be expected to form in compressed rather than expanded overlayers beyond a critical lattice misfit. In expanded overlayers the classical Stranski-Krastanov growth is expected to occur because the misfit dislocations can become energetically favored at smaller island sizes. The thermodynamic reason for coherent 3D islanding is incomplete wetting owing to the weaker adhesion of the edge atoms. Monolayer height islands with a critical size appear as necessary precursors of the 3D islands. This explains the experimentally observed narrow size distribution of the 3D islands. The 2D-3D transformation takes place by consecutive rearrangements of mono- to bilayer, bi- to trilayer islands, etc., after the corresponding critical sizes have been exceeded. The rearrangements are initiated by nucleation events, each one needing to overcome a lower energetic barrier than the one before. The model is in good qualitative agreement with available experimental observations.

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Presentado como Ponencia en Congreso de la UPV, Noviembre de 2008.

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This article was delivered as an area-paper to the Critical Political Science Meeting of Bilbao, November the 15th 2008, which was organized by the Political Science Department of the UPV (University of the Basque Country). The paper introduces an updated and synthetic version of the model designed by S.M. Lipset and S. Rokkan in 1967 in order to identify the confrontational divides distinctive of European modernization and, in this way, trace the origins of modern party systems. The expanded model proposed is applied, on the one hand, to a variety of empirical cases, prominently the postransitional Spanish case; and on the other, shows its usefulness in order to better understand the distinctive structure of the social conflict of the globalization era.

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Matrials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)