Brechas y paleokarst en los depósitos jurásicos de la "Serra de Tramuntana" de Mallorca

En la Serra de Tramuntana de Mallorca aflora un volumen importante de materiales calcareos brechados atribuidos al Jurasico. En este trabajo se revisan los diversos criterios aplicados en la bibliografía para analizar la génesis de los diversos tipos de brechas, y se aplican al estudio de las brechas de la Serra de Tramuntana. Se han diferenciado dos tipos de  brechas: brechas sinsedimentarias y por disolución evaporítica. Las primeras son la únicas indiscutiblemente jurasicas, mientras que las segundas podrían relacionarse con diversos episodios de emersión premiocenos, al igual que un tercer tipo de depósitos (brechas y areniscas) que rellenan cavidades karsticas situadas a techo de los materiales mesozoico

Optimizing photon indistinguishability in the emission from incoherently-excited semiconductor quantum dots

Most optical quantum devices require deterministic single-photon emitters. Schemes so far demonstrated in the solid state imply an energy relaxation which tends to spoil the coherent nature of the time evolution, and with it the photon indistinguishability. We focus our theoretical investigation on semiconductor quantum dots embedded in microcavities. Simple and general relations are identified between the photon indistinguishability and the collection efficiency. The identification of the key parameters and of their interplay provides clear indications for the device optimization

Morfologías parabólicas de los sistemas dunares litorales de Baleares

[Resumen] Debido a elevada cobertura vegetal que presentan, los sistemas dunares de las Baleares están formados principalmente por dunas parabólicas. Los tipos de dunas parabólicas que en ellos se encuentran Ounates, lobate, hemiciclics, enechelon, digitates, superimposed o nested), asi como su organización espacial, dependen tanto de la dinámica eólica actual -con especial referencia al grado de conservación de las foredunes- como de los cambios climáticos y eustáticos cuaternarios.[Abstract] The modern coastal dune systems of the Balearic Islands are characterized by a high vegetation cover and, as a consequence, a wide presence of parabolic dunes. Lunate, lobate, hemiciclic, en-echelon, digitate, superimposed and nested dunes are arranged in a complex setting. They relates not only with the modern eolian processes -special emphasis have to be marked in the state of foredune conservation- but also with the changes that have taken place during quaternary times

Participación vegetal en la construcción de los sistemas dunares litorales de Mallorca

[Resumen] Se establecen las relaciones entre la zonación vegetal y las áreas geomorfológicas de los sistemas dunares litorales de la isla de Mallorca. Para ello, se clasifican dichos sistemas en cuatro categorías en base a criterios morfológicos y de vegetación y se analiza la situación actual en cada uno de ellos, definiendose el papel que juega la vegetación en su arquitectura..[Abstract] The relationship between plant zonation and geomorphological areas have been studied in the coastal dunar systems of the island of Mallorca. Trough a four type classification based in vegetation and morphological criteria we point out their state of conservation and the role of the vegetation in their build-up

Forming first-ranked early-type galaxies through hierarchical dissipationless merging

We have developed a computationally competitive N-body model of a previrialized aggregation of galaxies in a flat LambdaCDM universe to assess the role of the multiple mergers that take place during the formation stage of such systems in the configuration of the remnants assembled at their centres. An analysis of a suite of 48 simulations of low-mass forming groups (of about 1E13 solar masses) demonstrates that the gravitational dynamics involved in their hierarchical collapse is capable of creating realistic first-ranked galaxies without the aid of dissipative processes. Our simulations indicate that the brightest group galaxies (BGGs) constitute a distinct population from other group members, sketching a scenario in which the assembly path of these objects is dictated largely by the formation of their host system. We detect significant differences in the distribution of Sersic indices and total magnitudes, as well as a luminosity gap between BGGs and the next brightest galaxy that is positively correlated with the total luminosity of the parent group. Such gaps arise from both the grow of BGGs at the expense of lesser companions and the decrease in the relevance of second-ranked objects in equal measure. This results in a dearth of intermediate-mass galaxies which explains the characteristic central dip detected in their luminosity functions in dynamically young galaxy aggregations. The fact that the basic global properties of our BGGs define a thin mass fundamental plane strikingly similar to that followed giant early-type galaxies in the local universe reinforces confidence in the results obtained.Comment: 25 pages, 14 figures, 3 tables. Accepted to MNRA